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1 | /* |
1 | /* |
2 | This is a version (aka dlmalloc) of malloc/free/realloc written by |
2 | This is a version (aka dlmalloc) of malloc/free/realloc written by |
3 | Doug Lea and released to the public domain, as explained at |
3 | Doug Lea and released to the public domain, as explained at |
4 | http://creativecommons.org/licenses/publicdomain. Send questions, |
4 | http://creativecommons.org/licenses/publicdomain. Send questions, |
5 | comments, complaints, performance data, etc to dl@cs.oswego.edu |
5 | comments, complaints, performance data, etc to dl@cs.oswego.edu |
6 | 6 | ||
7 | * Version 2.8.3 Thu Sep 22 11:16:15 2005 Doug Lea (dl at gee) |
7 | * Version 2.8.3 Thu Sep 22 11:16:15 2005 Doug Lea (dl at gee) |
8 | 8 | ||
9 | Note: There may be an updated version of this malloc obtainable at |
9 | Note: There may be an updated version of this malloc obtainable at |
10 | ftp://gee.cs.oswego.edu/pub/misc/malloc.c |
10 | ftp://gee.cs.oswego.edu/pub/misc/malloc.c |
11 | Check before installing! |
11 | Check before installing! |
12 | 12 | ||
13 | * Quickstart |
13 | * Quickstart |
14 | 14 | ||
15 | This library is all in one file to simplify the most common usage: |
15 | This library is all in one file to simplify the most common usage: |
16 | ftp it, compile it (-O3), and link it into another program. All of |
16 | ftp it, compile it (-O3), and link it into another program. All of |
17 | the compile-time options default to reasonable values for use on |
17 | the compile-time options default to reasonable values for use on |
18 | most platforms. You might later want to step through various |
18 | most platforms. You might later want to step through various |
19 | compile-time and dynamic tuning options. |
19 | compile-time and dynamic tuning options. |
20 | 20 | ||
21 | For convenience, an include file for code using this malloc is at: |
21 | For convenience, an include file for code using this malloc is at: |
22 | ftp://gee.cs.oswego.edu/pub/misc/malloc-2.8.3.h |
22 | ftp://gee.cs.oswego.edu/pub/misc/malloc-2.8.3.h |
23 | You don't really need this .h file unless you call functions not |
23 | You don't really need this .h file unless you call functions not |
24 | defined in your system include files. The .h file contains only the |
24 | defined in your system include files. The .h file contains only the |
25 | excerpts from this file needed for using this malloc on ANSI C/C++ |
25 | excerpts from this file needed for using this malloc on ANSI C/C++ |
26 | systems, so long as you haven't changed compile-time options about |
26 | systems, so long as you haven't changed compile-time options about |
27 | naming and tuning parameters. If you do, then you can create your |
27 | naming and tuning parameters. If you do, then you can create your |
28 | own malloc.h that does include all settings by cutting at the point |
28 | own malloc.h that does include all settings by cutting at the point |
29 | indicated below. Note that you may already by default be using a C |
29 | indicated below. Note that you may already by default be using a C |
30 | library containing a malloc that is based on some version of this |
30 | library containing a malloc that is based on some version of this |
31 | malloc (for example in linux). You might still want to use the one |
31 | malloc (for example in linux). You might still want to use the one |
32 | in this file to customize settings or to avoid overheads associated |
32 | in this file to customize settings or to avoid overheads associated |
33 | with library versions. |
33 | with library versions. |
34 | 34 | ||
35 | * Vital statistics: |
35 | * Vital statistics: |
36 | 36 | ||
37 | Supported pointer/size_t representation: 4 or 8 bytes |
37 | Supported pointer/size_t representation: 4 or 8 bytes |
38 | size_t MUST be an unsigned type of the same width as |
38 | size_t MUST be an unsigned type of the same width as |
39 | pointers. (If you are using an ancient system that declares |
39 | pointers. (If you are using an ancient system that declares |
40 | size_t as a signed type, or need it to be a different width |
40 | size_t as a signed type, or need it to be a different width |
41 | than pointers, you can use a previous release of this malloc |
41 | than pointers, you can use a previous release of this malloc |
42 | (e.g. 2.7.2) supporting these.) |
42 | (e.g. 2.7.2) supporting these.) |
43 | 43 | ||
44 | Alignment: 8 bytes (default) |
44 | Alignment: 8 bytes (default) |
45 | This suffices for nearly all current machines and C compilers. |
45 | This suffices for nearly all current machines and C compilers. |
46 | However, you can define MALLOC_ALIGNMENT to be wider than this |
46 | However, you can define MALLOC_ALIGNMENT to be wider than this |
47 | if necessary (up to 128bytes), at the expense of using more space. |
47 | if necessary (up to 128bytes), at the expense of using more space. |
48 | 48 | ||
49 | Minimum overhead per allocated chunk: 4 or 8 bytes (if 4byte sizes) |
49 | Minimum overhead per allocated chunk: 4 or 8 bytes (if 4byte sizes) |
50 | 8 or 16 bytes (if 8byte sizes) |
50 | 8 or 16 bytes (if 8byte sizes) |
51 | Each malloced chunk has a hidden word of overhead holding size |
51 | Each malloced chunk has a hidden word of overhead holding size |
52 | and status information, and additional cross-check word |
52 | and status information, and additional cross-check word |
53 | if FOOTERS is defined. |
53 | if FOOTERS is defined. |
54 | 54 | ||
55 | Minimum allocated size: 4-byte ptrs: 16 bytes (including overhead) |
55 | Minimum allocated size: 4-byte ptrs: 16 bytes (including overhead) |
56 | 8-byte ptrs: 32 bytes (including overhead) |
56 | 8-byte ptrs: 32 bytes (including overhead) |
57 | 57 | ||
58 | Even a request for zero bytes (i.e., malloc(0)) returns a |
58 | Even a request for zero bytes (i.e., malloc(0)) returns a |
59 | pointer to something of the minimum allocatable size. |
59 | pointer to something of the minimum allocatable size. |
60 | The maximum overhead wastage (i.e., number of extra bytes |
60 | The maximum overhead wastage (i.e., number of extra bytes |
61 | allocated than were requested in malloc) is less than or equal |
61 | allocated than were requested in malloc) is less than or equal |
62 | to the minimum size, except for requests >= mmap_threshold that |
62 | to the minimum size, except for requests >= mmap_threshold that |
63 | are serviced via mmap(), where the worst case wastage is about |
63 | are serviced via mmap(), where the worst case wastage is about |
64 | 32 bytes plus the remainder from a system page (the minimal |
64 | 32 bytes plus the remainder from a system page (the minimal |
65 | mmap unit); typically 4096 or 8192 bytes. |
65 | mmap unit); typically 4096 or 8192 bytes. |
66 | 66 | ||
67 | Security: static-safe; optionally more or less |
67 | Security: static-safe; optionally more or less |
68 | The "security" of malloc refers to the ability of malicious |
68 | The "security" of malloc refers to the ability of malicious |
69 | code to accentuate the effects of errors (for example, freeing |
69 | code to accentuate the effects of errors (for example, freeing |
70 | space that is not currently malloc'ed or overwriting past the |
70 | space that is not currently malloc'ed or overwriting past the |
71 | ends of chunks) in code that calls malloc. This malloc |
71 | ends of chunks) in code that calls malloc. This malloc |
72 | guarantees not to modify any memory locations below the base of |
72 | guarantees not to modify any memory locations below the base of |
73 | heap, i.e., static variables, even in the presence of usage |
73 | heap, i.e., static variables, even in the presence of usage |
74 | errors. The routines additionally detect most improper frees |
74 | errors. The routines additionally detect most improper frees |
75 | and reallocs. All this holds as long as the static bookkeeping |
75 | and reallocs. All this holds as long as the static bookkeeping |
76 | for malloc itself is not corrupted by some other means. This |
76 | for malloc itself is not corrupted by some other means. This |
77 | is only one aspect of security -- these checks do not, and |
77 | is only one aspect of security -- these checks do not, and |
78 | cannot, detect all possible programming errors. |
78 | cannot, detect all possible programming errors. |
79 | 79 | ||
80 | If FOOTERS is defined nonzero, then each allocated chunk |
80 | If FOOTERS is defined nonzero, then each allocated chunk |
81 | carries an additional check word to verify that it was malloced |
81 | carries an additional check word to verify that it was malloced |
82 | from its space. These check words are the same within each |
82 | from its space. These check words are the same within each |
83 | execution of a program using malloc, but differ across |
83 | execution of a program using malloc, but differ across |
84 | executions, so externally crafted fake chunks cannot be |
84 | executions, so externally crafted fake chunks cannot be |
85 | freed. This improves security by rejecting frees/reallocs that |
85 | freed. This improves security by rejecting frees/reallocs that |
86 | could corrupt heap memory, in addition to the checks preventing |
86 | could corrupt heap memory, in addition to the checks preventing |
87 | writes to statics that are always on. This may further improve |
87 | writes to statics that are always on. This may further improve |
88 | security at the expense of time and space overhead. (Note that |
88 | security at the expense of time and space overhead. (Note that |
89 | FOOTERS may also be worth using with MSPACES.) |
89 | FOOTERS may also be worth using with MSPACES.) |
90 | 90 | ||
91 | By default detected errors cause the program to abort (calling |
91 | By default detected errors cause the program to abort (calling |
92 | "abort()"). You can override this to instead proceed past |
92 | "abort()"). You can override this to instead proceed past |
93 | errors by defining PROCEED_ON_ERROR. In this case, a bad free |
93 | errors by defining PROCEED_ON_ERROR. In this case, a bad free |
94 | has no effect, and a malloc that encounters a bad address |
94 | has no effect, and a malloc that encounters a bad address |
95 | caused by user overwrites will ignore the bad address by |
95 | caused by user overwrites will ignore the bad address by |
96 | dropping pointers and indices to all known memory. This may |
96 | dropping pointers and indices to all known memory. This may |
97 | be appropriate for programs that should continue if at all |
97 | be appropriate for programs that should continue if at all |
98 | possible in the face of programming errors, although they may |
98 | possible in the face of programming errors, although they may |
99 | run out of memory because dropped memory is never reclaimed. |
99 | run out of memory because dropped memory is never reclaimed. |
100 | 100 | ||
101 | If you don't like either of these options, you can define |
101 | If you don't like either of these options, you can define |
102 | CORRUPTION_ERROR_ACTION and USAGE_ERROR_ACTION to do anything |
102 | CORRUPTION_ERROR_ACTION and USAGE_ERROR_ACTION to do anything |
103 | else. And if if you are sure that your program using malloc has |
103 | else. And if if you are sure that your program using malloc has |
104 | no errors or vulnerabilities, you can define INSECURE to 1, |
104 | no errors or vulnerabilities, you can define INSECURE to 1, |
105 | which might (or might not) provide a small performance improvement. |
105 | which might (or might not) provide a small performance improvement. |
106 | 106 | ||
107 | Thread-safety: NOT thread-safe unless USE_LOCKS defined |
107 | Thread-safety: NOT thread-safe unless USE_LOCKS defined |
108 | When USE_LOCKS is defined, each public call to malloc, free, |
108 | When USE_LOCKS is defined, each public call to malloc, free, |
109 | etc is surrounded with either a pthread mutex or a win32 |
109 | etc is surrounded with either a pthread mutex or a win32 |
110 | spinlock (depending on WIN32). This is not especially fast, and |
110 | spinlock (depending on WIN32). This is not especially fast, and |
111 | can be a major bottleneck. It is designed only to provide |
111 | can be a major bottleneck. It is designed only to provide |
112 | minimal protection in concurrent environments, and to provide a |
112 | minimal protection in concurrent environments, and to provide a |
113 | basis for extensions. If you are using malloc in a concurrent |
113 | basis for extensions. If you are using malloc in a concurrent |
114 | program, consider instead using ptmalloc, which is derived from |
114 | program, consider instead using ptmalloc, which is derived from |
115 | a version of this malloc. (See http://www.malloc.de). |
115 | a version of this malloc. (See http://www.malloc.de). |
116 | 116 | ||
117 | System requirements: Any combination of MORECORE and/or MMAP/MUNMAP |
117 | System requirements: Any combination of MORECORE and/or MMAP/MUNMAP |
118 | This malloc can use unix sbrk or any emulation (invoked using |
118 | This malloc can use unix sbrk or any emulation (invoked using |
119 | the CALL_MORECORE macro) and/or mmap/munmap or any emulation |
119 | the CALL_MORECORE macro) and/or mmap/munmap or any emulation |
120 | (invoked using CALL_MMAP/CALL_MUNMAP) to get and release system |
120 | (invoked using CALL_MMAP/CALL_MUNMAP) to get and release system |
121 | memory. On most unix systems, it tends to work best if both |
121 | memory. On most unix systems, it tends to work best if both |
122 | MORECORE and MMAP are enabled. On Win32, it uses emulations |
122 | MORECORE and MMAP are enabled. On Win32, it uses emulations |
123 | based on VirtualAlloc. It also uses common C library functions |
123 | based on VirtualAlloc. It also uses common C library functions |
124 | like memset. |
124 | like memset. |
125 | 125 | ||
126 | Compliance: I believe it is compliant with the Single Unix Specification |
126 | Compliance: I believe it is compliant with the Single Unix Specification |
127 | (See http://www.unix.org). Also SVID/XPG, ANSI C, and probably |
127 | (See http://www.unix.org). Also SVID/XPG, ANSI C, and probably |
128 | others as well. |
128 | others as well. |
129 | 129 | ||
130 | * Overview of algorithms |
130 | * Overview of algorithms |
131 | 131 | ||
132 | This is not the fastest, most space-conserving, most portable, or |
132 | This is not the fastest, most space-conserving, most portable, or |
133 | most tunable malloc ever written. However it is among the fastest |
133 | most tunable malloc ever written. However it is among the fastest |
134 | while also being among the most space-conserving, portable and |
134 | while also being among the most space-conserving, portable and |
135 | tunable. Consistent balance across these factors results in a good |
135 | tunable. Consistent balance across these factors results in a good |
136 | general-purpose allocator for malloc-intensive programs. |
136 | general-purpose allocator for malloc-intensive programs. |
137 | 137 | ||
138 | In most ways, this malloc is a best-fit allocator. Generally, it |
138 | In most ways, this malloc is a best-fit allocator. Generally, it |
139 | chooses the best-fitting existing chunk for a request, with ties |
139 | chooses the best-fitting existing chunk for a request, with ties |
140 | broken in approximately least-recently-used order. (This strategy |
140 | broken in approximately least-recently-used order. (This strategy |
141 | normally maintains low fragmentation.) However, for requests less |
141 | normally maintains low fragmentation.) However, for requests less |
142 | than 256bytes, it deviates from best-fit when there is not an |
142 | than 256bytes, it deviates from best-fit when there is not an |
143 | exactly fitting available chunk by preferring to use space adjacent |
143 | exactly fitting available chunk by preferring to use space adjacent |
144 | to that used for the previous small request, as well as by breaking |
144 | to that used for the previous small request, as well as by breaking |
145 | ties in approximately most-recently-used order. (These enhance |
145 | ties in approximately most-recently-used order. (These enhance |
146 | locality of series of small allocations.) And for very large requests |
146 | locality of series of small allocations.) And for very large requests |
147 | (>= 256Kb by default), it relies on system memory mapping |
147 | (>= 256Kb by default), it relies on system memory mapping |
148 | facilities, if supported. (This helps avoid carrying around and |
148 | facilities, if supported. (This helps avoid carrying around and |
149 | possibly fragmenting memory used only for large chunks.) |
149 | possibly fragmenting memory used only for large chunks.) |
150 | 150 | ||
151 | All operations (except malloc_stats and mallinfo) have execution |
151 | All operations (except malloc_stats and mallinfo) have execution |
152 | times that are bounded by a constant factor of the number of bits in |
152 | times that are bounded by a constant factor of the number of bits in |
153 | a size_t, not counting any clearing in calloc or copying in realloc, |
153 | a size_t, not counting any clearing in calloc or copying in realloc, |
154 | or actions surrounding MORECORE and MMAP that have times |
154 | or actions surrounding MORECORE and MMAP that have times |
155 | proportional to the number of non-contiguous regions returned by |
155 | proportional to the number of non-contiguous regions returned by |
156 | system allocation routines, which is often just 1. |
156 | system allocation routines, which is often just 1. |
157 | 157 | ||
158 | The implementation is not very modular and seriously overuses |
158 | The implementation is not very modular and seriously overuses |
159 | macros. Perhaps someday all C compilers will do as good a job |
159 | macros. Perhaps someday all C compilers will do as good a job |
160 | inlining modular code as can now be done by brute-force expansion, |
160 | inlining modular code as can now be done by brute-force expansion, |
161 | but now, enough of them seem not to. |
161 | but now, enough of them seem not to. |
162 | 162 | ||
163 | Some compilers issue a lot of warnings about code that is |
163 | Some compilers issue a lot of warnings about code that is |
164 | dead/unreachable only on some platforms, and also about intentional |
164 | dead/unreachable only on some platforms, and also about intentional |
165 | uses of negation on unsigned types. All known cases of each can be |
165 | uses of negation on unsigned types. All known cases of each can be |
166 | ignored. |
166 | ignored. |
167 | 167 | ||
168 | For a longer but out of date high-level description, see |
168 | For a longer but out of date high-level description, see |
169 | http://gee.cs.oswego.edu/dl/html/malloc.html |
169 | http://gee.cs.oswego.edu/dl/html/malloc.html |
170 | 170 | ||
171 | * MSPACES |
171 | * MSPACES |
172 | If MSPACES is defined, then in addition to malloc, free, etc., |
172 | If MSPACES is defined, then in addition to malloc, free, etc., |
173 | this file also defines mspace_malloc, mspace_free, etc. These |
173 | this file also defines mspace_malloc, mspace_free, etc. These |
174 | are versions of malloc routines that take an "mspace" argument |
174 | are versions of malloc routines that take an "mspace" argument |
175 | obtained using create_mspace, to control all internal bookkeeping. |
175 | obtained using create_mspace, to control all internal bookkeeping. |
176 | If ONLY_MSPACES is defined, only these versions are compiled. |
176 | If ONLY_MSPACES is defined, only these versions are compiled. |
177 | So if you would like to use this allocator for only some allocations, |
177 | So if you would like to use this allocator for only some allocations, |
178 | and your system malloc for others, you can compile with |
178 | and your system malloc for others, you can compile with |
179 | ONLY_MSPACES and then do something like... |
179 | ONLY_MSPACES and then do something like... |
180 | static mspace mymspace = create_mspace(0,0); // for example |
180 | static mspace mymspace = create_mspace(0,0); // for example |
181 | #define mymalloc(bytes) mspace_malloc(mymspace, bytes) |
181 | #define mymalloc(bytes) mspace_malloc(mymspace, bytes) |
182 | 182 | ||
183 | (Note: If you only need one instance of an mspace, you can instead |
183 | (Note: If you only need one instance of an mspace, you can instead |
184 | use "USE_DL_PREFIX" to relabel the global malloc.) |
184 | use "USE_DL_PREFIX" to relabel the global malloc.) |
185 | 185 | ||
186 | You can similarly create thread-local allocators by storing |
186 | You can similarly create thread-local allocators by storing |
187 | mspaces as thread-locals. For example: |
187 | mspaces as thread-locals. For example: |
188 | static __thread mspace tlms = 0; |
188 | static __thread mspace tlms = 0; |
189 | void* tlmalloc(size_t bytes) { |
189 | void* tlmalloc(size_t bytes) { |
190 | if (tlms == 0) tlms = create_mspace(0, 0); |
190 | if (tlms == 0) tlms = create_mspace(0, 0); |
191 | return mspace_malloc(tlms, bytes); |
191 | return mspace_malloc(tlms, bytes); |
192 | } |
192 | } |
193 | void tlfree(void* mem) { mspace_free(tlms, mem); } |
193 | void tlfree(void* mem) { mspace_free(tlms, mem); } |
194 | 194 | ||
195 | Unless FOOTERS is defined, each mspace is completely independent. |
195 | Unless FOOTERS is defined, each mspace is completely independent. |
196 | You cannot allocate from one and free to another (although |
196 | You cannot allocate from one and free to another (although |
197 | conformance is only weakly checked, so usage errors are not always |
197 | conformance is only weakly checked, so usage errors are not always |
198 | caught). If FOOTERS is defined, then each chunk carries around a tag |
198 | caught). If FOOTERS is defined, then each chunk carries around a tag |
199 | indicating its originating mspace, and frees are directed to their |
199 | indicating its originating mspace, and frees are directed to their |
200 | originating spaces. |
200 | originating spaces. |
201 | 201 | ||
202 | ------------------------- Compile-time options --------------------------- |
202 | ------------------------- Compile-time options --------------------------- |
203 | 203 | ||
204 | Be careful in setting #define values for numerical constants of type |
204 | Be careful in setting #define values for numerical constants of type |
205 | size_t. On some systems, literal values are not automatically extended |
205 | size_t. On some systems, literal values are not automatically extended |
206 | to size_t precision unless they are explicitly casted. |
206 | to size_t precision unless they are explicitly casted. |
207 | 207 | ||
208 | WIN32 default: defined if _WIN32 defined |
208 | WIN32 default: defined if _WIN32 defined |
209 | Defining WIN32 sets up defaults for MS environment and compilers. |
209 | Defining WIN32 sets up defaults for MS environment and compilers. |
210 | Otherwise defaults are for unix. |
210 | Otherwise defaults are for unix. |
211 | 211 | ||
212 | MALLOC_ALIGNMENT default: (size_t)8 |
212 | MALLOC_ALIGNMENT default: (size_t)8 |
213 | Controls the minimum alignment for malloc'ed chunks. It must be a |
213 | Controls the minimum alignment for malloc'ed chunks. It must be a |
214 | power of two and at least 8, even on machines for which smaller |
214 | power of two and at least 8, even on machines for which smaller |
215 | alignments would suffice. It may be defined as larger than this |
215 | alignments would suffice. It may be defined as larger than this |
216 | though. Note however that code and data structures are optimized for |
216 | though. Note however that code and data structures are optimized for |
217 | the case of 8-byte alignment. |
217 | the case of 8-byte alignment. |
218 | 218 | ||
219 | MSPACES default: 0 (false) |
219 | MSPACES default: 0 (false) |
220 | If true, compile in support for independent allocation spaces. |
220 | If true, compile in support for independent allocation spaces. |
221 | This is only supported if HAVE_MMAP is true. |
221 | This is only supported if HAVE_MMAP is true. |
222 | 222 | ||
223 | ONLY_MSPACES default: 0 (false) |
223 | ONLY_MSPACES default: 0 (false) |
224 | If true, only compile in mspace versions, not regular versions. |
224 | If true, only compile in mspace versions, not regular versions. |
225 | 225 | ||
226 | USE_LOCKS default: 0 (false) |
226 | USE_LOCKS default: 0 (false) |
227 | Causes each call to each public routine to be surrounded with |
227 | Causes each call to each public routine to be surrounded with |
228 | pthread or WIN32 mutex lock/unlock. (If set true, this can be |
228 | pthread or WIN32 mutex lock/unlock. (If set true, this can be |
229 | overridden on a per-mspace basis for mspace versions.) |
229 | overridden on a per-mspace basis for mspace versions.) |
230 | 230 | ||
231 | FOOTERS default: 0 |
231 | FOOTERS default: 0 |
232 | If true, provide extra checking and dispatching by placing |
232 | If true, provide extra checking and dispatching by placing |
233 | information in the footers of allocated chunks. This adds |
233 | information in the footers of allocated chunks. This adds |
234 | space and time overhead. |
234 | space and time overhead. |
235 | 235 | ||
236 | INSECURE default: 0 |
236 | INSECURE default: 0 |
237 | If true, omit checks for usage errors and heap space overwrites. |
237 | If true, omit checks for usage errors and heap space overwrites. |
238 | 238 | ||
239 | USE_DL_PREFIX default: NOT defined |
239 | USE_DL_PREFIX default: NOT defined |
240 | Causes compiler to prefix all public routines with the string 'dl'. |
240 | Causes compiler to prefix all public routines with the string 'dl'. |
241 | This can be useful when you only want to use this malloc in one part |
241 | This can be useful when you only want to use this malloc in one part |
242 | of a program, using your regular system malloc elsewhere. |
242 | of a program, using your regular system malloc elsewhere. |
243 | 243 | ||
244 | ABORT default: defined as abort() |
244 | ABORT default: defined as abort() |
245 | Defines how to abort on failed checks. On most systems, a failed |
245 | Defines how to abort on failed checks. On most systems, a failed |
246 | check cannot die with an "assert" or even print an informative |
246 | check cannot die with an "assert" or even print an informative |
247 | message, because the underlying print routines in turn call malloc, |
247 | message, because the underlying print routines in turn call malloc, |
248 | which will fail again. Generally, the best policy is to simply call |
248 | which will fail again. Generally, the best policy is to simply call |
249 | abort(). It's not very useful to do more than this because many |
249 | abort(). It's not very useful to do more than this because many |
250 | errors due to overwriting will show up as address faults (null, odd |
250 | errors due to overwriting will show up as address faults (null, odd |
251 | addresses etc) rather than malloc-triggered checks, so will also |
251 | addresses etc) rather than malloc-triggered checks, so will also |
252 | abort. Also, most compilers know that abort() does not return, so |
252 | abort. Also, most compilers know that abort() does not return, so |
253 | can better optimize code conditionally calling it. |
253 | can better optimize code conditionally calling it. |
254 | 254 | ||
255 | PROCEED_ON_ERROR default: defined as 0 (false) |
255 | PROCEED_ON_ERROR default: defined as 0 (false) |
256 | Controls whether detected bad addresses cause them to bypassed |
256 | Controls whether detected bad addresses cause them to bypassed |
257 | rather than aborting. If set, detected bad arguments to free and |
257 | rather than aborting. If set, detected bad arguments to free and |
258 | realloc are ignored. And all bookkeeping information is zeroed out |
258 | realloc are ignored. And all bookkeeping information is zeroed out |
259 | upon a detected overwrite of freed heap space, thus losing the |
259 | upon a detected overwrite of freed heap space, thus losing the |
260 | ability to ever return it from malloc again, but enabling the |
260 | ability to ever return it from malloc again, but enabling the |
261 | application to proceed. If PROCEED_ON_ERROR is defined, the |
261 | application to proceed. If PROCEED_ON_ERROR is defined, the |
262 | static variable malloc_corruption_error_count is compiled in |
262 | static variable malloc_corruption_error_count is compiled in |
263 | and can be examined to see if errors have occurred. This option |
263 | and can be examined to see if errors have occurred. This option |
264 | generates slower code than the default abort policy. |
264 | generates slower code than the default abort policy. |
265 | 265 | ||
266 | DEBUG default: NOT defined |
266 | DEBUG default: NOT defined |
267 | The DEBUG setting is mainly intended for people trying to modify |
267 | The DEBUG setting is mainly intended for people trying to modify |
268 | this code or diagnose problems when porting to new platforms. |
268 | this code or diagnose problems when porting to new platforms. |
269 | However, it may also be able to better isolate user errors than just |
269 | However, it may also be able to better isolate user errors than just |
270 | using runtime checks. The assertions in the check routines spell |
270 | using runtime checks. The assertions in the check routines spell |
271 | out in more detail the assumptions and invariants underlying the |
271 | out in more detail the assumptions and invariants underlying the |
272 | algorithms. The checking is fairly extensive, and will slow down |
272 | algorithms. The checking is fairly extensive, and will slow down |
273 | execution noticeably. Calling malloc_stats or mallinfo with DEBUG |
273 | execution noticeably. Calling malloc_stats or mallinfo with DEBUG |
274 | set will attempt to check every non-mmapped allocated and free chunk |
274 | set will attempt to check every non-mmapped allocated and free chunk |
275 | in the course of computing the summaries. |
275 | in the course of computing the summaries. |
276 | 276 | ||
277 | ABORT_ON_ASSERT_FAILURE default: defined as 1 (true) |
277 | ABORT_ON_ASSERT_FAILURE default: defined as 1 (true) |
278 | Debugging assertion failures can be nearly impossible if your |
278 | Debugging assertion failures can be nearly impossible if your |
279 | version of the assert macro causes malloc to be called, which will |
279 | version of the assert macro causes malloc to be called, which will |
280 | lead to a cascade of further failures, blowing the runtime stack. |
280 | lead to a cascade of further failures, blowing the runtime stack. |
281 | ABORT_ON_ASSERT_FAILURE cause assertions failures to call abort(), |
281 | ABORT_ON_ASSERT_FAILURE cause assertions failures to call abort(), |
282 | which will usually make debugging easier. |
282 | which will usually make debugging easier. |
283 | 283 | ||
284 | MALLOC_FAILURE_ACTION default: sets errno to ENOMEM, or no-op on win32 |
284 | MALLOC_FAILURE_ACTION default: sets errno to ENOMEM, or no-op on win32 |
285 | The action to take before "return 0" when malloc fails to be able to |
285 | The action to take before "return 0" when malloc fails to be able to |
286 | return memory because there is none available. |
286 | return memory because there is none available. |
287 | 287 | ||
288 | HAVE_MORECORE default: 1 (true) unless win32 or ONLY_MSPACES |
288 | HAVE_MORECORE default: 1 (true) unless win32 or ONLY_MSPACES |
289 | True if this system supports sbrk or an emulation of it. |
289 | True if this system supports sbrk or an emulation of it. |
290 | 290 | ||
291 | MORECORE default: sbrk |
291 | MORECORE default: sbrk |
292 | The name of the sbrk-style system routine to call to obtain more |
292 | The name of the sbrk-style system routine to call to obtain more |
293 | memory. See below for guidance on writing custom MORECORE |
293 | memory. See below for guidance on writing custom MORECORE |
294 | functions. The type of the argument to sbrk/MORECORE varies across |
294 | functions. The type of the argument to sbrk/MORECORE varies across |
295 | systems. It cannot be size_t, because it supports negative |
295 | systems. It cannot be size_t, because it supports negative |
296 | arguments, so it is normally the signed type of the same width as |
296 | arguments, so it is normally the signed type of the same width as |
297 | size_t (sometimes declared as "intptr_t"). It doesn't much matter |
297 | size_t (sometimes declared as "intptr_t"). It doesn't much matter |
298 | though. Internally, we only call it with arguments less than half |
298 | though. Internally, we only call it with arguments less than half |
299 | the max value of a size_t, which should work across all reasonable |
299 | the max value of a size_t, which should work across all reasonable |
300 | possibilities, although sometimes generating compiler warnings. See |
300 | possibilities, although sometimes generating compiler warnings. See |
301 | near the end of this file for guidelines for creating a custom |
301 | near the end of this file for guidelines for creating a custom |
302 | version of MORECORE. |
302 | version of MORECORE. |
303 | 303 | ||
304 | MORECORE_CONTIGUOUS default: 1 (true) |
304 | MORECORE_CONTIGUOUS default: 1 (true) |
305 | If true, take advantage of fact that consecutive calls to MORECORE |
305 | If true, take advantage of fact that consecutive calls to MORECORE |
306 | with positive arguments always return contiguous increasing |
306 | with positive arguments always return contiguous increasing |
307 | addresses. This is true of unix sbrk. It does not hurt too much to |
307 | addresses. This is true of unix sbrk. It does not hurt too much to |
308 | set it true anyway, since malloc copes with non-contiguities. |
308 | set it true anyway, since malloc copes with non-contiguities. |
309 | Setting it false when definitely non-contiguous saves time |
309 | Setting it false when definitely non-contiguous saves time |
310 | and possibly wasted space it would take to discover this though. |
310 | and possibly wasted space it would take to discover this though. |
311 | 311 | ||
312 | MORECORE_CANNOT_TRIM default: NOT defined |
312 | MORECORE_CANNOT_TRIM default: NOT defined |
313 | True if MORECORE cannot release space back to the system when given |
313 | True if MORECORE cannot release space back to the system when given |
314 | negative arguments. This is generally necessary only if you are |
314 | negative arguments. This is generally necessary only if you are |
315 | using a hand-crafted MORECORE function that cannot handle negative |
315 | using a hand-crafted MORECORE function that cannot handle negative |
316 | arguments. |
316 | arguments. |
317 | 317 | ||
318 | HAVE_MMAP default: 1 (true) |
318 | HAVE_MMAP default: 1 (true) |
319 | True if this system supports mmap or an emulation of it. If so, and |
319 | True if this system supports mmap or an emulation of it. If so, and |
320 | HAVE_MORECORE is not true, MMAP is used for all system |
320 | HAVE_MORECORE is not true, MMAP is used for all system |
321 | allocation. If set and HAVE_MORECORE is true as well, MMAP is |
321 | allocation. If set and HAVE_MORECORE is true as well, MMAP is |
322 | primarily used to directly allocate very large blocks. It is also |
322 | primarily used to directly allocate very large blocks. It is also |
323 | used as a backup strategy in cases where MORECORE fails to provide |
323 | used as a backup strategy in cases where MORECORE fails to provide |
324 | space from system. Note: A single call to MUNMAP is assumed to be |
324 | space from system. Note: A single call to MUNMAP is assumed to be |
325 | able to unmap memory that may have be allocated using multiple calls |
325 | able to unmap memory that may have be allocated using multiple calls |
326 | to MMAP, so long as they are adjacent. |
326 | to MMAP, so long as they are adjacent. |
327 | 327 | ||
328 | HAVE_MREMAP default: 1 on linux, else 0 |
328 | HAVE_MREMAP default: 1 on linux, else 0 |
329 | If true realloc() uses mremap() to re-allocate large blocks and |
329 | If true realloc() uses mremap() to re-allocate large blocks and |
330 | extend or shrink allocation spaces. |
330 | extend or shrink allocation spaces. |
331 | 331 | ||
332 | MMAP_CLEARS default: 1 on unix |
332 | MMAP_CLEARS default: 1 on unix |
333 | True if mmap clears memory so calloc doesn't need to. This is true |
333 | True if mmap clears memory so calloc doesn't need to. This is true |
334 | for standard unix mmap using /dev/zero. |
334 | for standard unix mmap using /dev/zero. |
335 | 335 | ||
336 | USE_BUILTIN_FFS default: 0 (i.e., not used) |
336 | USE_BUILTIN_FFS default: 0 (i.e., not used) |
337 | Causes malloc to use the builtin ffs() function to compute indices. |
337 | Causes malloc to use the builtin ffs() function to compute indices. |
338 | Some compilers may recognize and intrinsify ffs to be faster than the |
338 | Some compilers may recognize and intrinsify ffs to be faster than the |
339 | supplied C version. Also, the case of x86 using gcc is special-cased |
339 | supplied C version. Also, the case of x86 using gcc is special-cased |
340 | to an asm instruction, so is already as fast as it can be, and so |
340 | to an asm instruction, so is already as fast as it can be, and so |
341 | this setting has no effect. (On most x86s, the asm version is only |
341 | this setting has no effect. (On most x86s, the asm version is only |
342 | slightly faster than the C version.) |
342 | slightly faster than the C version.) |
343 | 343 | ||
344 | malloc_getpagesize default: derive from system includes, or 4096. |
344 | malloc_getpagesize default: derive from system includes, or 4096. |
345 | The system page size. To the extent possible, this malloc manages |
345 | The system page size. To the extent possible, this malloc manages |
346 | memory from the system in page-size units. This may be (and |
346 | memory from the system in page-size units. This may be (and |
347 | usually is) a function rather than a constant. This is ignored |
347 | usually is) a function rather than a constant. This is ignored |
348 | if WIN32, where page size is determined using getSystemInfo during |
348 | if WIN32, where page size is determined using getSystemInfo during |
349 | initialization. |
349 | initialization. |
350 | 350 | ||
351 | USE_DEV_RANDOM default: 0 (i.e., not used) |
351 | USE_DEV_RANDOM default: 0 (i.e., not used) |
352 | Causes malloc to use /dev/random to initialize secure magic seed for |
352 | Causes malloc to use /dev/random to initialize secure magic seed for |
353 | stamping footers. Otherwise, the current time is used. |
353 | stamping footers. Otherwise, the current time is used. |
354 | 354 | ||
355 | NO_MALLINFO default: 0 |
355 | NO_MALLINFO default: 0 |
356 | If defined, don't compile "mallinfo". This can be a simple way |
356 | If defined, don't compile "mallinfo". This can be a simple way |
357 | of dealing with mismatches between system declarations and |
357 | of dealing with mismatches between system declarations and |
358 | those in this file. |
358 | those in this file. |
359 | 359 | ||
360 | MALLINFO_FIELD_TYPE default: size_t |
360 | MALLINFO_FIELD_TYPE default: size_t |
361 | The type of the fields in the mallinfo struct. This was originally |
361 | The type of the fields in the mallinfo struct. This was originally |
362 | defined as "int" in SVID etc, but is more usefully defined as |
362 | defined as "int" in SVID etc, but is more usefully defined as |
363 | size_t. The value is used only if HAVE_USR_INCLUDE_MALLOC_H is not set |
363 | size_t. The value is used only if HAVE_USR_INCLUDE_MALLOC_H is not set |
364 | 364 | ||
365 | REALLOC_ZERO_BYTES_FREES default: not defined |
365 | REALLOC_ZERO_BYTES_FREES default: not defined |
366 | This should be set if a call to realloc with zero bytes should |
366 | This should be set if a call to realloc with zero bytes should |
367 | be the same as a call to free. Some people think it should. Otherwise, |
367 | be the same as a call to free. Some people think it should. Otherwise, |
368 | since this malloc returns a unique pointer for malloc(0), so does |
368 | since this malloc returns a unique pointer for malloc(0), so does |
369 | realloc(p, 0). |
369 | realloc(p, 0). |
370 | 370 | ||
371 | LACKS_UNISTD_H, LACKS_FCNTL_H, LACKS_SYS_PARAM_H, LACKS_SYS_MMAN_H |
371 | LACKS_UNISTD_H, LACKS_FCNTL_H, LACKS_SYS_PARAM_H, LACKS_SYS_MMAN_H |
372 | LACKS_STRINGS_H, LACKS_STRING_H, LACKS_SYS_TYPES_H, LACKS_ERRNO_H |
372 | LACKS_STRINGS_H, LACKS_STRING_H, LACKS_SYS_TYPES_H, LACKS_ERRNO_H |
373 | LACKS_STDLIB_H default: NOT defined unless on WIN32 |
373 | LACKS_STDLIB_H default: NOT defined unless on WIN32 |
374 | Define these if your system does not have these header files. |
374 | Define these if your system does not have these header files. |
375 | You might need to manually insert some of the declarations they provide. |
375 | You might need to manually insert some of the declarations they provide. |
376 | 376 | ||
377 | DEFAULT_GRANULARITY default: page size if MORECORE_CONTIGUOUS, |
377 | DEFAULT_GRANULARITY default: page size if MORECORE_CONTIGUOUS, |
378 | system_info.dwAllocationGranularity in WIN32, |
378 | system_info.dwAllocationGranularity in WIN32, |
379 | otherwise 64K. |
379 | otherwise 64K. |
380 | Also settable using mallopt(M_GRANULARITY, x) |
380 | Also settable using mallopt(M_GRANULARITY, x) |
381 | The unit for allocating and deallocating memory from the system. On |
381 | The unit for allocating and deallocating memory from the system. On |
382 | most systems with contiguous MORECORE, there is no reason to |
382 | most systems with contiguous MORECORE, there is no reason to |
383 | make this more than a page. However, systems with MMAP tend to |
383 | make this more than a page. However, systems with MMAP tend to |
384 | either require or encourage larger granularities. You can increase |
384 | either require or encourage larger granularities. You can increase |
385 | this value to prevent system allocation functions to be called so |
385 | this value to prevent system allocation functions to be called so |
386 | often, especially if they are slow. The value must be at least one |
386 | often, especially if they are slow. The value must be at least one |
387 | page and must be a power of two. Setting to 0 causes initialization |
387 | page and must be a power of two. Setting to 0 causes initialization |
388 | to either page size or win32 region size. (Note: In previous |
388 | to either page size or win32 region size. (Note: In previous |
389 | versions of malloc, the equivalent of this option was called |
389 | versions of malloc, the equivalent of this option was called |
390 | "TOP_PAD") |
390 | "TOP_PAD") |
391 | 391 | ||
392 | DEFAULT_TRIM_THRESHOLD default: 2MB |
392 | DEFAULT_TRIM_THRESHOLD default: 2MB |
393 | Also settable using mallopt(M_TRIM_THRESHOLD, x) |
393 | Also settable using mallopt(M_TRIM_THRESHOLD, x) |
394 | The maximum amount of unused top-most memory to keep before |
394 | The maximum amount of unused top-most memory to keep before |
395 | releasing via malloc_trim in free(). Automatic trimming is mainly |
395 | releasing via malloc_trim in free(). Automatic trimming is mainly |
396 | useful in long-lived programs using contiguous MORECORE. Because |
396 | useful in long-lived programs using contiguous MORECORE. Because |
397 | trimming via sbrk can be slow on some systems, and can sometimes be |
397 | trimming via sbrk can be slow on some systems, and can sometimes be |
398 | wasteful (in cases where programs immediately afterward allocate |
398 | wasteful (in cases where programs immediately afterward allocate |
399 | more large chunks) the value should be high enough so that your |
399 | more large chunks) the value should be high enough so that your |
400 | overall system performance would improve by releasing this much |
400 | overall system performance would improve by releasing this much |
401 | memory. As a rough guide, you might set to a value close to the |
401 | memory. As a rough guide, you might set to a value close to the |
402 | average size of a process (program) running on your system. |
402 | average size of a process (program) running on your system. |
403 | Releasing this much memory would allow such a process to run in |
403 | Releasing this much memory would allow such a process to run in |
404 | memory. Generally, it is worth tuning trim thresholds when a |
404 | memory. Generally, it is worth tuning trim thresholds when a |
405 | program undergoes phases where several large chunks are allocated |
405 | program undergoes phases where several large chunks are allocated |
406 | and released in ways that can reuse each other's storage, perhaps |
406 | and released in ways that can reuse each other's storage, perhaps |
407 | mixed with phases where there are no such chunks at all. The trim |
407 | mixed with phases where there are no such chunks at all. The trim |
408 | value must be greater than page size to have any useful effect. To |
408 | value must be greater than page size to have any useful effect. To |
409 | disable trimming completely, you can set to MAX_SIZE_T. Note that the trick |
409 | disable trimming completely, you can set to MAX_SIZE_T. Note that the trick |
410 | some people use of mallocing a huge space and then freeing it at |
410 | some people use of mallocing a huge space and then freeing it at |
411 | program startup, in an attempt to reserve system memory, doesn't |
411 | program startup, in an attempt to reserve system memory, doesn't |
412 | have the intended effect under automatic trimming, since that memory |
412 | have the intended effect under automatic trimming, since that memory |
413 | will immediately be returned to the system. |
413 | will immediately be returned to the system. |
414 | 414 | ||
415 | DEFAULT_MMAP_THRESHOLD default: 256K |
415 | DEFAULT_MMAP_THRESHOLD default: 256K |
416 | Also settable using mallopt(M_MMAP_THRESHOLD, x) |
416 | Also settable using mallopt(M_MMAP_THRESHOLD, x) |
417 | The request size threshold for using MMAP to directly service a |
417 | The request size threshold for using MMAP to directly service a |
418 | request. Requests of at least this size that cannot be allocated |
418 | request. Requests of at least this size that cannot be allocated |
419 | using already-existing space will be serviced via mmap. (If enough |
419 | using already-existing space will be serviced via mmap. (If enough |
420 | normal freed space already exists it is used instead.) Using mmap |
420 | normal freed space already exists it is used instead.) Using mmap |
421 | segregates relatively large chunks of memory so that they can be |
421 | segregates relatively large chunks of memory so that they can be |
422 | individually obtained and released from the host system. A request |
422 | individually obtained and released from the host system. A request |
423 | serviced through mmap is never reused by any other request (at least |
423 | serviced through mmap is never reused by any other request (at least |
424 | not directly; the system may just so happen to remap successive |
424 | not directly; the system may just so happen to remap successive |
425 | requests to the same locations). Segregating space in this way has |
425 | requests to the same locations). Segregating space in this way has |
426 | the benefits that: Mmapped space can always be individually released |
426 | the benefits that: Mmapped space can always be individually released |
427 | back to the system, which helps keep the system level memory demands |
427 | back to the system, which helps keep the system level memory demands |
428 | of a long-lived program low. Also, mapped memory doesn't become |
428 | of a long-lived program low. Also, mapped memory doesn't become |
429 | `locked' between other chunks, as can happen with normally allocated |
429 | `locked' between other chunks, as can happen with normally allocated |
430 | chunks, which means that even trimming via malloc_trim would not |
430 | chunks, which means that even trimming via malloc_trim would not |
431 | release them. However, it has the disadvantage that the space |
431 | release them. However, it has the disadvantage that the space |
432 | cannot be reclaimed, consolidated, and then used to service later |
432 | cannot be reclaimed, consolidated, and then used to service later |
433 | requests, as happens with normal chunks. The advantages of mmap |
433 | requests, as happens with normal chunks. The advantages of mmap |
434 | nearly always outweigh disadvantages for "large" chunks, but the |
434 | nearly always outweigh disadvantages for "large" chunks, but the |
435 | value of "large" may vary across systems. The default is an |
435 | value of "large" may vary across systems. The default is an |
436 | empirically derived value that works well in most systems. You can |
436 | empirically derived value that works well in most systems. You can |
437 | disable mmap by setting to MAX_SIZE_T. |
437 | disable mmap by setting to MAX_SIZE_T. |
438 | 438 | ||
439 | */ |
439 | */ |
440 | 440 | ||
441 | #ifndef WIN32 |
- | |
442 | #ifdef _WIN32 |
- | |
443 | #define WIN32 1 |
- | |
444 | #endif /* _WIN32 */ |
441 | #include <sys/types.h> /* For size_t */ |
445 | #endif /* WIN32 */ |
- | |
446 | #ifdef WIN32 |
442 | |
447 | #define WIN32_LEAN_AND_MEAN |
443 | /** Non-default helenos customizations */ |
448 | #include <windows.h> |
- | |
449 | #define HAVE_MMAP 1 |
- | |
450 | #define HAVE_MORECORE 0 |
- | |
451 | #define LACKS_UNISTD_H |
444 | #define LACKS_FCNTL_H |
452 | #define LACKS_SYS_PARAM_H |
- | |
453 | #define LACKS_SYS_MMAN_H |
445 | #define LACKS_SYS_MMAN_H |
454 | #define LACKS_STRING_H |
446 | #define LACKS_SYS_PARAM_H |
455 | #define LACKS_STRINGS_H |
447 | #undef HAVE_MMAP |
456 | #define LACKS_SYS_TYPES_H |
448 | #define HAVE_MMAP 0 |
457 | #define LACKS_ERRNO_H |
449 | #define LACKS_ERRNO_H |
- | 450 | /* Set errno? */ |
|
- | 451 | #undef MALLOC_FAILURE_ACTION |
|
458 | #define MALLOC_FAILURE_ACTION |
452 | #define MALLOC_FAILURE_ACTION |
459 | #define MMAP_CLEARS 0 /* WINCE and some others apparently don't clear */ |
- | |
460 | #endif /* WIN32 */ |
- | |
461 | - | ||
462 | #if defined(DARWIN) || defined(_DARWIN) |
- | |
463 | /* Mac OSX docs advise not to use sbrk; it seems better to use mmap */ |
- | |
464 | #ifndef HAVE_MORECORE |
- | |
465 | #define HAVE_MORECORE 0 |
- | |
466 | #define HAVE_MMAP 1 |
- | |
467 | #endif /* HAVE_MORECORE */ |
- | |
468 | #endif /* DARWIN */ |
- | |
469 | - | ||
470 | #ifndef LACKS_SYS_TYPES_H |
- | |
471 | #include <sys/types.h> /* For size_t */ |
- | |
472 | #endif /* LACKS_SYS_TYPES_H */ |
- | |
473 | 453 | ||
474 | /* The maximum possible size_t value has all bits set */ |
454 | /* The maximum possible size_t value has all bits set */ |
475 | #define MAX_SIZE_T (~(size_t)0) |
455 | #define MAX_SIZE_T (~(size_t)0) |
476 | 456 | ||
477 | #ifndef ONLY_MSPACES |
- | |
478 | #define ONLY_MSPACES 0 |
457 | #define ONLY_MSPACES 0 |
479 | #endif /* ONLY_MSPACES */ |
- | |
480 | #ifndef MSPACES |
- | |
481 | #if ONLY_MSPACES |
- | |
482 | #define MSPACES 1 |
- | |
483 | #else /* ONLY_MSPACES */ |
- | |
484 | #define MSPACES 0 |
458 | #define MSPACES 0 |
485 | #endif /* ONLY_MSPACES */ |
- | |
486 | #endif /* MSPACES */ |
- | |
487 | #ifndef MALLOC_ALIGNMENT |
- | |
488 | #define MALLOC_ALIGNMENT ((size_t)8U) |
459 | #define MALLOC_ALIGNMENT ((size_t)8U) |
489 | #endif /* MALLOC_ALIGNMENT */ |
- | |
490 | #ifndef FOOTERS |
- | |
491 | #define FOOTERS 0 |
460 | #define FOOTERS 0 |
492 | #endif /* FOOTERS */ |
- | |
493 | #ifndef ABORT |
- | |
494 | #define ABORT abort() |
461 | #define ABORT abort() |
495 | #endif /* ABORT */ |
- | |
496 | #ifndef ABORT_ON_ASSERT_FAILURE |
- | |
497 | #define ABORT_ON_ASSERT_FAILURE 1 |
462 | #define ABORT_ON_ASSERT_FAILURE 1 |
498 | #endif /* ABORT_ON_ASSERT_FAILURE */ |
- | |
499 | #ifndef PROCEED_ON_ERROR |
- | |
500 | #define PROCEED_ON_ERROR 0 |
463 | #define PROCEED_ON_ERROR 0 |
501 | #endif /* PROCEED_ON_ERROR */ |
- | |
502 | #ifndef USE_LOCKS |
- | |
503 | #define USE_LOCKS 0 |
464 | #define USE_LOCKS 0 |
504 | #endif /* USE_LOCKS */ |
- | |
505 | #ifndef INSECURE |
- | |
506 | #define INSECURE 0 |
465 | #define INSECURE 0 |
507 | #endif /* INSECURE */ |
- | |
508 | #ifndef HAVE_MMAP |
- | |
509 | #define HAVE_MMAP 1 |
466 | #define HAVE_MMAP 0 |
510 | #endif /* HAVE_MMAP */ |
- | |
511 | #ifndef MMAP_CLEARS |
- | |
- | 467 | ||
512 | #define MMAP_CLEARS 1 |
468 | #define MMAP_CLEARS 1 |
513 | #endif /* MMAP_CLEARS */ |
- | |
514 | #ifndef HAVE_MREMAP |
- | |
515 | #ifdef linux |
469 | |
516 | #define HAVE_MREMAP 1 |
- | |
517 | #else /* linux */ |
- | |
518 | #define HAVE_MREMAP 0 |
- | |
519 | #endif /* linux */ |
- | |
520 | #endif /* HAVE_MREMAP */ |
- | |
521 | #ifndef MALLOC_FAILURE_ACTION |
- | |
522 | #define MALLOC_FAILURE_ACTION errno = ENOMEM; |
- | |
523 | #endif /* MALLOC_FAILURE_ACTION */ |
- | |
524 | #ifndef HAVE_MORECORE |
- | |
525 | #if ONLY_MSPACES |
- | |
526 | #define HAVE_MORECORE 0 |
- | |
527 | #else /* ONLY_MSPACES */ |
- | |
528 | #define HAVE_MORECORE 1 |
470 | #define HAVE_MORECORE 1 |
529 | #endif /* ONLY_MSPACES */ |
- | |
530 | #endif /* HAVE_MORECORE */ |
- | |
531 | #if !HAVE_MORECORE |
- | |
532 | #define MORECORE_CONTIGUOUS 0 |
- | |
533 | #else /* !HAVE_MORECORE */ |
- | |
534 | #ifndef MORECORE |
- | |
535 | #define MORECORE sbrk |
- | |
536 | #endif /* MORECORE */ |
- | |
537 | #ifndef MORECORE_CONTIGUOUS |
- | |
538 | #define MORECORE_CONTIGUOUS 1 |
471 | #define MORECORE_CONTIGUOUS 1 |
539 | #endif /* MORECORE_CONTIGUOUS */ |
- | |
540 | #endif /* HAVE_MORECORE */ |
472 | #define MORECORE sbrk |
541 | #ifndef DEFAULT_GRANULARITY |
- | |
542 | #if MORECORE_CONTIGUOUS |
- | |
543 | #define DEFAULT_GRANULARITY (0) /* 0 means to compute in init_mparams */ |
473 | #define DEFAULT_GRANULARITY (0) /* 0 means to compute in init_mparams */ |
544 | #else /* MORECORE_CONTIGUOUS */ |
- | |
545 | #define DEFAULT_GRANULARITY ((size_t)64U * (size_t)1024U) |
- | |
546 | #endif /* MORECORE_CONTIGUOUS */ |
- | |
547 | #endif /* DEFAULT_GRANULARITY */ |
- | |
- | 474 | ||
548 | #ifndef DEFAULT_TRIM_THRESHOLD |
475 | #ifndef DEFAULT_TRIM_THRESHOLD |
549 | #ifndef MORECORE_CANNOT_TRIM |
476 | #ifndef MORECORE_CANNOT_TRIM |
550 | #define DEFAULT_TRIM_THRESHOLD ((size_t)2U * (size_t)1024U * (size_t)1024U) |
477 | #define DEFAULT_TRIM_THRESHOLD ((size_t)2U * (size_t)1024U * (size_t)1024U) |
551 | #else /* MORECORE_CANNOT_TRIM */ |
478 | #else /* MORECORE_CANNOT_TRIM */ |
552 | #define DEFAULT_TRIM_THRESHOLD MAX_SIZE_T |
479 | #define DEFAULT_TRIM_THRESHOLD MAX_SIZE_T |
553 | #endif /* MORECORE_CANNOT_TRIM */ |
480 | #endif /* MORECORE_CANNOT_TRIM */ |
554 | #endif /* DEFAULT_TRIM_THRESHOLD */ |
481 | #endif /* DEFAULT_TRIM_THRESHOLD */ |
555 | #ifndef DEFAULT_MMAP_THRESHOLD |
482 | #ifndef DEFAULT_MMAP_THRESHOLD |
556 | #if HAVE_MMAP |
483 | #if HAVE_MMAP |
557 | #define DEFAULT_MMAP_THRESHOLD ((size_t)256U * (size_t)1024U) |
484 | #define DEFAULT_MMAP_THRESHOLD ((size_t)256U * (size_t)1024U) |
558 | #else /* HAVE_MMAP */ |
485 | #else /* HAVE_MMAP */ |
559 | #define DEFAULT_MMAP_THRESHOLD MAX_SIZE_T |
486 | #define DEFAULT_MMAP_THRESHOLD MAX_SIZE_T |
560 | #endif /* HAVE_MMAP */ |
487 | #endif /* HAVE_MMAP */ |
561 | #endif /* DEFAULT_MMAP_THRESHOLD */ |
488 | #endif /* DEFAULT_MMAP_THRESHOLD */ |
562 | #ifndef USE_BUILTIN_FFS |
489 | #ifndef USE_BUILTIN_FFS |
563 | #define USE_BUILTIN_FFS 0 |
490 | #define USE_BUILTIN_FFS 0 |
564 | #endif /* USE_BUILTIN_FFS */ |
491 | #endif /* USE_BUILTIN_FFS */ |
565 | #ifndef USE_DEV_RANDOM |
492 | #ifndef USE_DEV_RANDOM |
566 | #define USE_DEV_RANDOM 0 |
493 | #define USE_DEV_RANDOM 0 |
567 | #endif /* USE_DEV_RANDOM */ |
494 | #endif /* USE_DEV_RANDOM */ |
568 | #ifndef NO_MALLINFO |
495 | #ifndef NO_MALLINFO |
569 | #define NO_MALLINFO 0 |
496 | #define NO_MALLINFO 0 |
570 | #endif /* NO_MALLINFO */ |
497 | #endif /* NO_MALLINFO */ |
571 | #ifndef MALLINFO_FIELD_TYPE |
498 | #ifndef MALLINFO_FIELD_TYPE |
572 | #define MALLINFO_FIELD_TYPE size_t |
499 | #define MALLINFO_FIELD_TYPE size_t |
573 | #endif /* MALLINFO_FIELD_TYPE */ |
500 | #endif /* MALLINFO_FIELD_TYPE */ |
574 | 501 | ||
575 | /* |
502 | /* |
576 | mallopt tuning options. SVID/XPG defines four standard parameter |
503 | mallopt tuning options. SVID/XPG defines four standard parameter |
577 | numbers for mallopt, normally defined in malloc.h. None of these |
504 | numbers for mallopt, normally defined in malloc.h. None of these |
578 | are used in this malloc, so setting them has no effect. But this |
505 | are used in this malloc, so setting them has no effect. But this |
579 | malloc does support the following options. |
506 | malloc does support the following options. |
580 | */ |
507 | */ |
581 | 508 | ||
582 | #define M_TRIM_THRESHOLD (-1) |
509 | #define M_TRIM_THRESHOLD (-1) |
583 | #define M_GRANULARITY (-2) |
510 | #define M_GRANULARITY (-2) |
584 | #define M_MMAP_THRESHOLD (-3) |
511 | #define M_MMAP_THRESHOLD (-3) |
585 | 512 | ||
586 | /** Non-default helenos customizations */ |
- | |
587 | #define LACKS_FCNTL_H |
- | |
588 | #define LACKS_SYS_MMAN_H |
- | |
589 | #define LACKS_SYS_PARAM_H |
- | |
590 | #undef HAVE_MMAP |
- | |
591 | #define HAVE_MMAP 0 |
- | |
592 | #define LACKS_ERRNO_H |
- | |
593 | /* Set errno? */ |
- | |
594 | #undef MALLOC_FAILURE_ACTION |
- | |
595 | #define MALLOC_FAILURE_ACTION |
- | |
596 | - | ||
597 | - | ||
598 | /* |
513 | /* |
599 | ======================================================================== |
514 | ======================================================================== |
600 | To make a fully customizable malloc.h header file, cut everything |
515 | To make a fully customizable malloc.h header file, cut everything |
601 | above this line, put into file malloc.h, edit to suit, and #include it |
516 | above this line, put into file malloc.h, edit to suit, and #include it |
602 | on the next line, as well as in programs that use this malloc. |
517 | on the next line, as well as in programs that use this malloc. |
603 | ======================================================================== |
518 | ======================================================================== |
604 | */ |
519 | */ |
605 | 520 | ||
606 | #include "malloc.h" |
521 | #include "malloc.h" |
607 | 522 | ||
608 | /*------------------------------ internal #includes ---------------------- */ |
523 | /*------------------------------ internal #includes ---------------------- */ |
609 | 524 | ||
610 | #ifdef WIN32 |
- | |
611 | #pragma warning( disable : 4146 ) /* no "unsigned" warnings */ |
- | |
612 | #endif /* WIN32 */ |
- | |
613 | - | ||
614 | #include <stdio.h> /* for printing in malloc_stats */ |
525 | #include <stdio.h> /* for printing in malloc_stats */ |
- | 526 | #include <string.h> |
|
615 | 527 | ||
616 | #ifndef LACKS_ERRNO_H |
528 | #ifndef LACKS_ERRNO_H |
617 | #include <errno.h> /* for MALLOC_FAILURE_ACTION */ |
529 | #include <errno.h> /* for MALLOC_FAILURE_ACTION */ |
618 | #endif /* LACKS_ERRNO_H */ |
530 | #endif /* LACKS_ERRNO_H */ |
619 | #if FOOTERS |
531 | #if FOOTERS |
620 | #include <time.h> /* for magic initialization */ |
532 | #include <time.h> /* for magic initialization */ |
621 | #endif /* FOOTERS */ |
533 | #endif /* FOOTERS */ |
622 | #ifndef LACKS_STDLIB_H |
534 | #ifndef LACKS_STDLIB_H |
623 | #include <stdlib.h> /* for abort() */ |
535 | #include <stdlib.h> /* for abort() */ |
624 | #endif /* LACKS_STDLIB_H */ |
536 | #endif /* LACKS_STDLIB_H */ |
625 | #ifdef DEBUG |
537 | #ifdef DEBUG |
626 | #if ABORT_ON_ASSERT_FAILURE |
538 | #if ABORT_ON_ASSERT_FAILURE |
627 | #define assert(x) if(!(x)) ABORT |
539 | #define assert(x) if(!(x)) ABORT |
628 | #else /* ABORT_ON_ASSERT_FAILURE */ |
540 | #else /* ABORT_ON_ASSERT_FAILURE */ |
629 | #include <assert.h> |
541 | #include <assert.h> |
630 | #endif /* ABORT_ON_ASSERT_FAILURE */ |
542 | #endif /* ABORT_ON_ASSERT_FAILURE */ |
631 | #else /* DEBUG */ |
543 | #else /* DEBUG */ |
632 | #define assert(x) |
544 | #define assert(x) |
633 | #endif /* DEBUG */ |
545 | #endif /* DEBUG */ |
634 | #ifndef LACKS_STRING_H |
- | |
635 | #include <string.h> /* for memset etc */ |
- | |
636 | #endif /* LACKS_STRING_H */ |
- | |
637 | #if USE_BUILTIN_FFS |
546 | #if USE_BUILTIN_FFS |
638 | #ifndef LACKS_STRINGS_H |
547 | #ifndef LACKS_STRINGS_H |
639 | #include <strings.h> /* for ffs */ |
548 | #include <strings.h> /* for ffs */ |
640 | #endif /* LACKS_STRINGS_H */ |
549 | #endif /* LACKS_STRINGS_H */ |
641 | #endif /* USE_BUILTIN_FFS */ |
550 | #endif /* USE_BUILTIN_FFS */ |
642 | #if HAVE_MMAP |
551 | #if HAVE_MMAP |
643 | #ifndef LACKS_SYS_MMAN_H |
552 | #ifndef LACKS_SYS_MMAN_H |
644 | #include <sys/mman.h> /* for mmap */ |
553 | #include <sys/mman.h> /* for mmap */ |
645 | #endif /* LACKS_SYS_MMAN_H */ |
554 | #endif /* LACKS_SYS_MMAN_H */ |
646 | #ifndef LACKS_FCNTL_H |
555 | #ifndef LACKS_FCNTL_H |
647 | #include <fcntl.h> |
556 | #include <fcntl.h> |
648 | #endif /* LACKS_FCNTL_H */ |
557 | #endif /* LACKS_FCNTL_H */ |
649 | #endif /* HAVE_MMAP */ |
558 | #endif /* HAVE_MMAP */ |
650 | #if HAVE_MORECORE |
559 | #if HAVE_MORECORE |
651 | #ifndef LACKS_UNISTD_H |
560 | #ifndef LACKS_UNISTD_H |
652 | #include <unistd.h> /* for sbrk */ |
561 | #include <unistd.h> /* for sbrk */ |
653 | #else /* LACKS_UNISTD_H */ |
562 | #else /* LACKS_UNISTD_H */ |
654 | #if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__) |
563 | #if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__) |
655 | extern void* sbrk(ptrdiff_t); |
564 | extern void* sbrk(ptrdiff_t); |
656 | #endif /* FreeBSD etc */ |
565 | #endif /* FreeBSD etc */ |
657 | #endif /* LACKS_UNISTD_H */ |
566 | #endif /* LACKS_UNISTD_H */ |
658 | #endif /* HAVE_MMAP */ |
567 | #endif /* HAVE_MMAP */ |
659 | 568 | ||
660 | #ifndef WIN32 |
569 | #ifndef WIN32 |
661 | #ifndef malloc_getpagesize |
570 | #ifndef malloc_getpagesize |
662 | # ifdef _SC_PAGESIZE /* some SVR4 systems omit an underscore */ |
571 | # ifdef _SC_PAGESIZE /* some SVR4 systems omit an underscore */ |
663 | # ifndef _SC_PAGE_SIZE |
572 | # ifndef _SC_PAGE_SIZE |
664 | # define _SC_PAGE_SIZE _SC_PAGESIZE |
573 | # define _SC_PAGE_SIZE _SC_PAGESIZE |
665 | # endif |
574 | # endif |
666 | # endif |
575 | # endif |
667 | # ifdef _SC_PAGE_SIZE |
576 | # ifdef _SC_PAGE_SIZE |
668 | # define malloc_getpagesize sysconf(_SC_PAGE_SIZE) |
577 | # define malloc_getpagesize sysconf(_SC_PAGE_SIZE) |
669 | # else |
578 | # else |
670 | # if defined(BSD) || defined(DGUX) || defined(HAVE_GETPAGESIZE) |
579 | # if defined(BSD) || defined(DGUX) || defined(HAVE_GETPAGESIZE) |
671 | extern size_t getpagesize(); |
580 | extern size_t getpagesize(); |
672 | # define malloc_getpagesize getpagesize() |
581 | # define malloc_getpagesize getpagesize() |
673 | # else |
582 | # else |
674 | # ifdef WIN32 /* use supplied emulation of getpagesize */ |
583 | # ifdef WIN32 /* use supplied emulation of getpagesize */ |
675 | # define malloc_getpagesize getpagesize() |
584 | # define malloc_getpagesize getpagesize() |
676 | # else |
585 | # else |
677 | # ifndef LACKS_SYS_PARAM_H |
586 | # ifndef LACKS_SYS_PARAM_H |
678 | # include <sys/param.h> |
587 | # include <sys/param.h> |
679 | # endif |
588 | # endif |
680 | # ifdef EXEC_PAGESIZE |
589 | # ifdef EXEC_PAGESIZE |
681 | # define malloc_getpagesize EXEC_PAGESIZE |
590 | # define malloc_getpagesize EXEC_PAGESIZE |
682 | # else |
591 | # else |
683 | # ifdef NBPG |
592 | # ifdef NBPG |
684 | # ifndef CLSIZE |
593 | # ifndef CLSIZE |
685 | # define malloc_getpagesize NBPG |
594 | # define malloc_getpagesize NBPG |
686 | # else |
595 | # else |
687 | # define malloc_getpagesize (NBPG * CLSIZE) |
596 | # define malloc_getpagesize (NBPG * CLSIZE) |
688 | # endif |
597 | # endif |
689 | # else |
598 | # else |
690 | # ifdef NBPC |
599 | # ifdef NBPC |
691 | # define malloc_getpagesize NBPC |
600 | # define malloc_getpagesize NBPC |
692 | # else |
601 | # else |
693 | # ifdef PAGESIZE |
602 | # ifdef PAGESIZE |
694 | # define malloc_getpagesize PAGESIZE |
603 | # define malloc_getpagesize PAGESIZE |
695 | # else /* just guess */ |
604 | # else /* just guess */ |
696 | # define malloc_getpagesize ((size_t)4096U) |
605 | # define malloc_getpagesize ((size_t)4096U) |
697 | # endif |
606 | # endif |
698 | # endif |
607 | # endif |
699 | # endif |
608 | # endif |
700 | # endif |
609 | # endif |
701 | # endif |
610 | # endif |
702 | # endif |
611 | # endif |
703 | # endif |
612 | # endif |
704 | #endif |
613 | #endif |
705 | #endif |
614 | #endif |
706 | 615 | ||
707 | /* ------------------- size_t and alignment properties -------------------- */ |
616 | /* ------------------- size_t and alignment properties -------------------- */ |
708 | 617 | ||
709 | /* The byte and bit size of a size_t */ |
618 | /* The byte and bit size of a size_t */ |
710 | #define SIZE_T_SIZE (sizeof(size_t)) |
619 | #define SIZE_T_SIZE (sizeof(size_t)) |
711 | #define SIZE_T_BITSIZE (sizeof(size_t) << 3) |
620 | #define SIZE_T_BITSIZE (sizeof(size_t) << 3) |
712 | 621 | ||
713 | /* Some constants coerced to size_t */ |
622 | /* Some constants coerced to size_t */ |
714 | /* Annoying but necessary to avoid errors on some plaftorms */ |
623 | /* Annoying but necessary to avoid errors on some plaftorms */ |
715 | #define SIZE_T_ZERO ((size_t)0) |
624 | #define SIZE_T_ZERO ((size_t)0) |
716 | #define SIZE_T_ONE ((size_t)1) |
625 | #define SIZE_T_ONE ((size_t)1) |
717 | #define SIZE_T_TWO ((size_t)2) |
626 | #define SIZE_T_TWO ((size_t)2) |
718 | #define TWO_SIZE_T_SIZES (SIZE_T_SIZE<<1) |
627 | #define TWO_SIZE_T_SIZES (SIZE_T_SIZE<<1) |
719 | #define FOUR_SIZE_T_SIZES (SIZE_T_SIZE<<2) |
628 | #define FOUR_SIZE_T_SIZES (SIZE_T_SIZE<<2) |
720 | #define SIX_SIZE_T_SIZES (FOUR_SIZE_T_SIZES+TWO_SIZE_T_SIZES) |
629 | #define SIX_SIZE_T_SIZES (FOUR_SIZE_T_SIZES+TWO_SIZE_T_SIZES) |
721 | #define HALF_MAX_SIZE_T (MAX_SIZE_T / 2U) |
630 | #define HALF_MAX_SIZE_T (MAX_SIZE_T / 2U) |
722 | 631 | ||
723 | /* The bit mask value corresponding to MALLOC_ALIGNMENT */ |
632 | /* The bit mask value corresponding to MALLOC_ALIGNMENT */ |
724 | #define CHUNK_ALIGN_MASK (MALLOC_ALIGNMENT - SIZE_T_ONE) |
633 | #define CHUNK_ALIGN_MASK (MALLOC_ALIGNMENT - SIZE_T_ONE) |
725 | 634 | ||
726 | /* True if address a has acceptable alignment */ |
635 | /* True if address a has acceptable alignment */ |
727 | #define is_aligned(A) (((size_t)((A)) & (CHUNK_ALIGN_MASK)) == 0) |
636 | #define is_aligned(A) (((size_t)((A)) & (CHUNK_ALIGN_MASK)) == 0) |
728 | 637 | ||
729 | /* the number of bytes to offset an address to align it */ |
638 | /* the number of bytes to offset an address to align it */ |
730 | #define align_offset(A)\ |
639 | #define align_offset(A)\ |
731 | ((((size_t)(A) & CHUNK_ALIGN_MASK) == 0)? 0 :\ |
640 | ((((size_t)(A) & CHUNK_ALIGN_MASK) == 0)? 0 :\ |
732 | ((MALLOC_ALIGNMENT - ((size_t)(A) & CHUNK_ALIGN_MASK)) & CHUNK_ALIGN_MASK)) |
641 | ((MALLOC_ALIGNMENT - ((size_t)(A) & CHUNK_ALIGN_MASK)) & CHUNK_ALIGN_MASK)) |
733 | 642 | ||
734 | /* -------------------------- MMAP preliminaries ------------------------- */ |
643 | /* -------------------------- MMAP preliminaries ------------------------- */ |
735 | 644 | ||
736 | /* |
645 | /* |
737 | If HAVE_MORECORE or HAVE_MMAP are false, we just define calls and |
646 | If HAVE_MORECORE or HAVE_MMAP are false, we just define calls and |
738 | checks to fail so compiler optimizer can delete code rather than |
647 | checks to fail so compiler optimizer can delete code rather than |
739 | using so many "#if"s. |
648 | using so many "#if"s. |
740 | */ |
649 | */ |
741 | 650 | ||
742 | 651 | ||
743 | /* MORECORE and MMAP must return MFAIL on failure */ |
652 | /* MORECORE and MMAP must return MFAIL on failure */ |
744 | #define MFAIL ((void*)(MAX_SIZE_T)) |
653 | #define MFAIL ((void*)(MAX_SIZE_T)) |
745 | #define CMFAIL ((char*)(MFAIL)) /* defined for convenience */ |
654 | #define CMFAIL ((char*)(MFAIL)) /* defined for convenience */ |
746 | 655 | ||
747 | #if !HAVE_MMAP |
656 | #if !HAVE_MMAP |
748 | #define IS_MMAPPED_BIT (SIZE_T_ZERO) |
657 | #define IS_MMAPPED_BIT (SIZE_T_ZERO) |
749 | #define USE_MMAP_BIT (SIZE_T_ZERO) |
658 | #define USE_MMAP_BIT (SIZE_T_ZERO) |
750 | #define CALL_MMAP(s) MFAIL |
659 | #define CALL_MMAP(s) MFAIL |
751 | #define CALL_MUNMAP(a, s) (-1) |
660 | #define CALL_MUNMAP(a, s) (-1) |
752 | #define DIRECT_MMAP(s) MFAIL |
661 | #define DIRECT_MMAP(s) MFAIL |
753 | 662 | ||
754 | #else /* HAVE_MMAP */ |
663 | #else /* HAVE_MMAP */ |
755 | #define IS_MMAPPED_BIT (SIZE_T_ONE) |
664 | #define IS_MMAPPED_BIT (SIZE_T_ONE) |
756 | #define USE_MMAP_BIT (SIZE_T_ONE) |
665 | #define USE_MMAP_BIT (SIZE_T_ONE) |
757 | 666 | ||
758 | #ifndef WIN32 |
667 | #ifndef WIN32 |
759 | #define CALL_MUNMAP(a, s) munmap((a), (s)) |
668 | #define CALL_MUNMAP(a, s) munmap((a), (s)) |
760 | #define MMAP_PROT (PROT_READ|PROT_WRITE) |
669 | #define MMAP_PROT (PROT_READ|PROT_WRITE) |
761 | #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON) |
670 | #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON) |
762 | #define MAP_ANONYMOUS MAP_ANON |
671 | #define MAP_ANONYMOUS MAP_ANON |
763 | #endif /* MAP_ANON */ |
672 | #endif /* MAP_ANON */ |
764 | #ifdef MAP_ANONYMOUS |
673 | #ifdef MAP_ANONYMOUS |
765 | #define MMAP_FLAGS (MAP_PRIVATE|MAP_ANONYMOUS) |
674 | #define MMAP_FLAGS (MAP_PRIVATE|MAP_ANONYMOUS) |
766 | #define CALL_MMAP(s) mmap(0, (s), MMAP_PROT, MMAP_FLAGS, -1, 0) |
675 | #define CALL_MMAP(s) mmap(0, (s), MMAP_PROT, MMAP_FLAGS, -1, 0) |
767 | #else /* MAP_ANONYMOUS */ |
676 | #else /* MAP_ANONYMOUS */ |
768 | /* |
677 | /* |
769 | Nearly all versions of mmap support MAP_ANONYMOUS, so the following |
678 | Nearly all versions of mmap support MAP_ANONYMOUS, so the following |
770 | is unlikely to be needed, but is supplied just in case. |
679 | is unlikely to be needed, but is supplied just in case. |
771 | */ |
680 | */ |
772 | #define MMAP_FLAGS (MAP_PRIVATE) |
681 | #define MMAP_FLAGS (MAP_PRIVATE) |
773 | static int dev_zero_fd = -1; /* Cached file descriptor for /dev/zero. */ |
682 | static int dev_zero_fd = -1; /* Cached file descriptor for /dev/zero. */ |
774 | #define CALL_MMAP(s) ((dev_zero_fd < 0) ? \ |
683 | #define CALL_MMAP(s) ((dev_zero_fd < 0) ? \ |
775 | (dev_zero_fd = open("/dev/zero", O_RDWR), \ |
684 | (dev_zero_fd = open("/dev/zero", O_RDWR), \ |
776 | mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0)) : \ |
685 | mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0)) : \ |
777 | mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0)) |
686 | mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0)) |
778 | #endif /* MAP_ANONYMOUS */ |
687 | #endif /* MAP_ANONYMOUS */ |
779 | 688 | ||
780 | #define DIRECT_MMAP(s) CALL_MMAP(s) |
689 | #define DIRECT_MMAP(s) CALL_MMAP(s) |
781 | #else /* WIN32 */ |
690 | #else /* WIN32 */ |
782 | 691 | ||
783 | /* Win32 MMAP via VirtualAlloc */ |
692 | /* Win32 MMAP via VirtualAlloc */ |
784 | static void* win32mmap(size_t size) { |
693 | static void* win32mmap(size_t size) { |
785 | void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE); |
694 | void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE); |
786 | return (ptr != 0)? ptr: MFAIL; |
695 | return (ptr != 0)? ptr: MFAIL; |
787 | } |
696 | } |
788 | 697 | ||
789 | /* For direct MMAP, use MEM_TOP_DOWN to minimize interference */ |
698 | /* For direct MMAP, use MEM_TOP_DOWN to minimize interference */ |
790 | static void* win32direct_mmap(size_t size) { |
699 | static void* win32direct_mmap(size_t size) { |
791 | void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN, |
700 | void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN, |
792 | PAGE_READWRITE); |
701 | PAGE_READWRITE); |
793 | return (ptr != 0)? ptr: MFAIL; |
702 | return (ptr != 0)? ptr: MFAIL; |
794 | } |
703 | } |
795 | 704 | ||
796 | /* This function supports releasing coalesed segments */ |
705 | /* This function supports releasing coalesed segments */ |
797 | static int win32munmap(void* ptr, size_t size) { |
706 | static int win32munmap(void* ptr, size_t size) { |
798 | MEMORY_BASIC_INFORMATION minfo; |
707 | MEMORY_BASIC_INFORMATION minfo; |
799 | char* cptr = ptr; |
708 | char* cptr = ptr; |
800 | while (size) { |
709 | while (size) { |
801 | if (VirtualQuery(cptr, &minfo, sizeof(minfo)) == 0) |
710 | if (VirtualQuery(cptr, &minfo, sizeof(minfo)) == 0) |
802 | return -1; |
711 | return -1; |
803 | if (minfo.BaseAddress != cptr || minfo.AllocationBase != cptr || |
712 | if (minfo.BaseAddress != cptr || minfo.AllocationBase != cptr || |
804 | minfo.State != MEM_COMMIT || minfo.RegionSize > size) |
713 | minfo.State != MEM_COMMIT || minfo.RegionSize > size) |
805 | return -1; |
714 | return -1; |
806 | if (VirtualFree(cptr, 0, MEM_RELEASE) == 0) |
715 | if (VirtualFree(cptr, 0, MEM_RELEASE) == 0) |
807 | return -1; |
716 | return -1; |
808 | cptr += minfo.RegionSize; |
717 | cptr += minfo.RegionSize; |
809 | size -= minfo.RegionSize; |
718 | size -= minfo.RegionSize; |
810 | } |
719 | } |
811 | return 0; |
720 | return 0; |
812 | } |
721 | } |
813 | 722 | ||
814 | #define CALL_MMAP(s) win32mmap(s) |
723 | #define CALL_MMAP(s) win32mmap(s) |
815 | #define CALL_MUNMAP(a, s) win32munmap((a), (s)) |
724 | #define CALL_MUNMAP(a, s) win32munmap((a), (s)) |
816 | #define DIRECT_MMAP(s) win32direct_mmap(s) |
725 | #define DIRECT_MMAP(s) win32direct_mmap(s) |
817 | #endif /* WIN32 */ |
726 | #endif /* WIN32 */ |
818 | #endif /* HAVE_MMAP */ |
727 | #endif /* HAVE_MMAP */ |
819 | 728 | ||
820 | #if HAVE_MMAP && HAVE_MREMAP |
729 | #if HAVE_MMAP && HAVE_MREMAP |
821 | #define CALL_MREMAP(addr, osz, nsz, mv) mremap((addr), (osz), (nsz), (mv)) |
730 | #define CALL_MREMAP(addr, osz, nsz, mv) mremap((addr), (osz), (nsz), (mv)) |
822 | #else /* HAVE_MMAP && HAVE_MREMAP */ |
731 | #else /* HAVE_MMAP && HAVE_MREMAP */ |
823 | #define CALL_MREMAP(addr, osz, nsz, mv) MFAIL |
732 | #define CALL_MREMAP(addr, osz, nsz, mv) MFAIL |
824 | #endif /* HAVE_MMAP && HAVE_MREMAP */ |
733 | #endif /* HAVE_MMAP && HAVE_MREMAP */ |
825 | 734 | ||
826 | #if HAVE_MORECORE |
735 | #if HAVE_MORECORE |
827 | #define CALL_MORECORE(S) MORECORE(S) |
736 | #define CALL_MORECORE(S) MORECORE(S) |
828 | #else /* HAVE_MORECORE */ |
737 | #else /* HAVE_MORECORE */ |
829 | #define CALL_MORECORE(S) MFAIL |
738 | #define CALL_MORECORE(S) MFAIL |
830 | #endif /* HAVE_MORECORE */ |
739 | #endif /* HAVE_MORECORE */ |
831 | 740 | ||
832 | /* mstate bit set if continguous morecore disabled or failed */ |
741 | /* mstate bit set if continguous morecore disabled or failed */ |
833 | #define USE_NONCONTIGUOUS_BIT (4U) |
742 | #define USE_NONCONTIGUOUS_BIT (4U) |
834 | 743 | ||
835 | /* segment bit set in create_mspace_with_base */ |
744 | /* segment bit set in create_mspace_with_base */ |
836 | #define EXTERN_BIT (8U) |
745 | #define EXTERN_BIT (8U) |
837 | 746 | ||
838 | 747 | ||
839 | /* --------------------------- Lock preliminaries ------------------------ */ |
748 | /* --------------------------- Lock preliminaries ------------------------ */ |
840 | 749 | ||
841 | #if USE_LOCKS |
750 | #if USE_LOCKS |
842 | 751 | ||
843 | /* |
752 | /* |
844 | When locks are defined, there are up to two global locks: |
753 | When locks are defined, there are up to two global locks: |
845 | 754 | ||
846 | * If HAVE_MORECORE, morecore_mutex protects sequences of calls to |
755 | * If HAVE_MORECORE, morecore_mutex protects sequences of calls to |
847 | MORECORE. In many cases sys_alloc requires two calls, that should |
756 | MORECORE. In many cases sys_alloc requires two calls, that should |
848 | not be interleaved with calls by other threads. This does not |
757 | not be interleaved with calls by other threads. This does not |
849 | protect against direct calls to MORECORE by other threads not |
758 | protect against direct calls to MORECORE by other threads not |
850 | using this lock, so there is still code to cope the best we can on |
759 | using this lock, so there is still code to cope the best we can on |
851 | interference. |
760 | interference. |
852 | 761 | ||
853 | * magic_init_mutex ensures that mparams.magic and other |
762 | * magic_init_mutex ensures that mparams.magic and other |
854 | unique mparams values are initialized only once. |
763 | unique mparams values are initialized only once. |
855 | */ |
764 | */ |
856 | 765 | ||
857 | #ifndef WIN32 |
766 | #ifndef WIN32 |
858 | /* By default use posix locks */ |
767 | /* By default use posix locks */ |
859 | #include <pthread.h> |
768 | #include <pthread.h> |
860 | #define MLOCK_T pthread_mutex_t |
769 | #define MLOCK_T pthread_mutex_t |
861 | #define INITIAL_LOCK(l) pthread_mutex_init(l, NULL) |
770 | #define INITIAL_LOCK(l) pthread_mutex_init(l, NULL) |
862 | #define ACQUIRE_LOCK(l) pthread_mutex_lock(l) |
771 | #define ACQUIRE_LOCK(l) pthread_mutex_lock(l) |
863 | #define RELEASE_LOCK(l) pthread_mutex_unlock(l) |
772 | #define RELEASE_LOCK(l) pthread_mutex_unlock(l) |
864 | 773 | ||
865 | #if HAVE_MORECORE |
774 | #if HAVE_MORECORE |
866 | static MLOCK_T morecore_mutex = PTHREAD_MUTEX_INITIALIZER; |
775 | static MLOCK_T morecore_mutex = PTHREAD_MUTEX_INITIALIZER; |
867 | #endif /* HAVE_MORECORE */ |
776 | #endif /* HAVE_MORECORE */ |
868 | 777 | ||
869 | static MLOCK_T magic_init_mutex = PTHREAD_MUTEX_INITIALIZER; |
778 | static MLOCK_T magic_init_mutex = PTHREAD_MUTEX_INITIALIZER; |
870 | 779 | ||
871 | #else /* WIN32 */ |
780 | #else /* WIN32 */ |
872 | /* |
781 | /* |
873 | Because lock-protected regions have bounded times, and there |
782 | Because lock-protected regions have bounded times, and there |
874 | are no recursive lock calls, we can use simple spinlocks. |
783 | are no recursive lock calls, we can use simple spinlocks. |
875 | */ |
784 | */ |
876 | 785 | ||
877 | #define MLOCK_T long |
786 | #define MLOCK_T long |
878 | static int win32_acquire_lock (MLOCK_T *sl) { |
787 | static int win32_acquire_lock (MLOCK_T *sl) { |
879 | for (;;) { |
788 | for (;;) { |
880 | #ifdef InterlockedCompareExchangePointer |
789 | #ifdef InterlockedCompareExchangePointer |
881 | if (!InterlockedCompareExchange(sl, 1, 0)) |
790 | if (!InterlockedCompareExchange(sl, 1, 0)) |
882 | return 0; |
791 | return 0; |
883 | #else /* Use older void* version */ |
792 | #else /* Use older void* version */ |
884 | if (!InterlockedCompareExchange((void**)sl, (void*)1, (void*)0)) |
793 | if (!InterlockedCompareExchange((void**)sl, (void*)1, (void*)0)) |
885 | return 0; |
794 | return 0; |
886 | #endif /* InterlockedCompareExchangePointer */ |
795 | #endif /* InterlockedCompareExchangePointer */ |
887 | Sleep (0); |
796 | Sleep (0); |
888 | } |
797 | } |
889 | } |
798 | } |
890 | 799 | ||
891 | static void win32_release_lock (MLOCK_T *sl) { |
800 | static void win32_release_lock (MLOCK_T *sl) { |
892 | InterlockedExchange (sl, 0); |
801 | InterlockedExchange (sl, 0); |
893 | } |
802 | } |
894 | 803 | ||
895 | #define INITIAL_LOCK(l) *(l)=0 |
804 | #define INITIAL_LOCK(l) *(l)=0 |
896 | #define ACQUIRE_LOCK(l) win32_acquire_lock(l) |
805 | #define ACQUIRE_LOCK(l) win32_acquire_lock(l) |
897 | #define RELEASE_LOCK(l) win32_release_lock(l) |
806 | #define RELEASE_LOCK(l) win32_release_lock(l) |
898 | #if HAVE_MORECORE |
807 | #if HAVE_MORECORE |
899 | static MLOCK_T morecore_mutex; |
808 | static MLOCK_T morecore_mutex; |
900 | #endif /* HAVE_MORECORE */ |
809 | #endif /* HAVE_MORECORE */ |
901 | static MLOCK_T magic_init_mutex; |
810 | static MLOCK_T magic_init_mutex; |
902 | #endif /* WIN32 */ |
811 | #endif /* WIN32 */ |
903 | 812 | ||
904 | #define USE_LOCK_BIT (2U) |
813 | #define USE_LOCK_BIT (2U) |
905 | #else /* USE_LOCKS */ |
814 | #else /* USE_LOCKS */ |
906 | #define USE_LOCK_BIT (0U) |
815 | #define USE_LOCK_BIT (0U) |
907 | #define INITIAL_LOCK(l) |
816 | #define INITIAL_LOCK(l) |
908 | #endif /* USE_LOCKS */ |
817 | #endif /* USE_LOCKS */ |
909 | 818 | ||
910 | #if USE_LOCKS && HAVE_MORECORE |
819 | #if USE_LOCKS && HAVE_MORECORE |
911 | #define ACQUIRE_MORECORE_LOCK() ACQUIRE_LOCK(&morecore_mutex); |
820 | #define ACQUIRE_MORECORE_LOCK() ACQUIRE_LOCK(&morecore_mutex); |
912 | #define RELEASE_MORECORE_LOCK() RELEASE_LOCK(&morecore_mutex); |
821 | #define RELEASE_MORECORE_LOCK() RELEASE_LOCK(&morecore_mutex); |
913 | #else /* USE_LOCKS && HAVE_MORECORE */ |
822 | #else /* USE_LOCKS && HAVE_MORECORE */ |
914 | #define ACQUIRE_MORECORE_LOCK() |
823 | #define ACQUIRE_MORECORE_LOCK() |
915 | #define RELEASE_MORECORE_LOCK() |
824 | #define RELEASE_MORECORE_LOCK() |
916 | #endif /* USE_LOCKS && HAVE_MORECORE */ |
825 | #endif /* USE_LOCKS && HAVE_MORECORE */ |
917 | 826 | ||
918 | #if USE_LOCKS |
827 | #if USE_LOCKS |
919 | #define ACQUIRE_MAGIC_INIT_LOCK() ACQUIRE_LOCK(&magic_init_mutex); |
828 | #define ACQUIRE_MAGIC_INIT_LOCK() ACQUIRE_LOCK(&magic_init_mutex); |
920 | #define RELEASE_MAGIC_INIT_LOCK() RELEASE_LOCK(&magic_init_mutex); |
829 | #define RELEASE_MAGIC_INIT_LOCK() RELEASE_LOCK(&magic_init_mutex); |
921 | #else /* USE_LOCKS */ |
830 | #else /* USE_LOCKS */ |
922 | #define ACQUIRE_MAGIC_INIT_LOCK() |
831 | #define ACQUIRE_MAGIC_INIT_LOCK() |
923 | #define RELEASE_MAGIC_INIT_LOCK() |
832 | #define RELEASE_MAGIC_INIT_LOCK() |
924 | #endif /* USE_LOCKS */ |
833 | #endif /* USE_LOCKS */ |
925 | 834 | ||
926 | 835 | ||
927 | /* ----------------------- Chunk representations ------------------------ */ |
836 | /* ----------------------- Chunk representations ------------------------ */ |
928 | 837 | ||
929 | /* |
838 | /* |
930 | (The following includes lightly edited explanations by Colin Plumb.) |
839 | (The following includes lightly edited explanations by Colin Plumb.) |
931 | 840 | ||
932 | The malloc_chunk declaration below is misleading (but accurate and |
841 | The malloc_chunk declaration below is misleading (but accurate and |
933 | necessary). It declares a "view" into memory allowing access to |
842 | necessary). It declares a "view" into memory allowing access to |
934 | necessary fields at known offsets from a given base. |
843 | necessary fields at known offsets from a given base. |
935 | 844 | ||
936 | Chunks of memory are maintained using a `boundary tag' method as |
845 | Chunks of memory are maintained using a `boundary tag' method as |
937 | originally described by Knuth. (See the paper by Paul Wilson |
846 | originally described by Knuth. (See the paper by Paul Wilson |
938 | ftp://ftp.cs.utexas.edu/pub/garbage/allocsrv.ps for a survey of such |
847 | ftp://ftp.cs.utexas.edu/pub/garbage/allocsrv.ps for a survey of such |
939 | techniques.) Sizes of free chunks are stored both in the front of |
848 | techniques.) Sizes of free chunks are stored both in the front of |
940 | each chunk and at the end. This makes consolidating fragmented |
849 | each chunk and at the end. This makes consolidating fragmented |
941 | chunks into bigger chunks fast. The head fields also hold bits |
850 | chunks into bigger chunks fast. The head fields also hold bits |
942 | representing whether chunks are free or in use. |
851 | representing whether chunks are free or in use. |
943 | 852 | ||
944 | Here are some pictures to make it clearer. They are "exploded" to |
853 | Here are some pictures to make it clearer. They are "exploded" to |
945 | show that the state of a chunk can be thought of as extending from |
854 | show that the state of a chunk can be thought of as extending from |
946 | the high 31 bits of the head field of its header through the |
855 | the high 31 bits of the head field of its header through the |
947 | prev_foot and PINUSE_BIT bit of the following chunk header. |
856 | prev_foot and PINUSE_BIT bit of the following chunk header. |
948 | 857 | ||
949 | A chunk that's in use looks like: |
858 | A chunk that's in use looks like: |
950 | 859 | ||
951 | chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
860 | chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
952 | | Size of previous chunk (if P = 1) | |
861 | | Size of previous chunk (if P = 1) | |
953 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
862 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
954 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P| |
863 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P| |
955 | | Size of this chunk 1| +-+ |
864 | | Size of this chunk 1| +-+ |
956 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
865 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
957 | | | |
866 | | | |
958 | +- -+ |
867 | +- -+ |
959 | | | |
868 | | | |
960 | +- -+ |
869 | +- -+ |
961 | | : |
870 | | : |
962 | +- size - sizeof(size_t) available payload bytes -+ |
871 | +- size - sizeof(size_t) available payload bytes -+ |
963 | : | |
872 | : | |
964 | chunk-> +- -+ |
873 | chunk-> +- -+ |
965 | | | |
874 | | | |
966 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
875 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
967 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1| |
876 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1| |
968 | | Size of next chunk (may or may not be in use) | +-+ |
877 | | Size of next chunk (may or may not be in use) | +-+ |
969 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
878 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
970 | 879 | ||
971 | And if it's free, it looks like this: |
880 | And if it's free, it looks like this: |
972 | 881 | ||
973 | chunk-> +- -+ |
882 | chunk-> +- -+ |
974 | | User payload (must be in use, or we would have merged!) | |
883 | | User payload (must be in use, or we would have merged!) | |
975 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
884 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
976 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P| |
885 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P| |
977 | | Size of this chunk 0| +-+ |
886 | | Size of this chunk 0| +-+ |
978 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
887 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
979 | | Next pointer | |
888 | | Next pointer | |
980 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
889 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
981 | | Prev pointer | |
890 | | Prev pointer | |
982 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
891 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
983 | | : |
892 | | : |
984 | +- size - sizeof(struct chunk) unused bytes -+ |
893 | +- size - sizeof(struct chunk) unused bytes -+ |
985 | : | |
894 | : | |
986 | chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
895 | chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
987 | | Size of this chunk | |
896 | | Size of this chunk | |
988 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
897 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
989 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0| |
898 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0| |
990 | | Size of next chunk (must be in use, or we would have merged)| +-+ |
899 | | Size of next chunk (must be in use, or we would have merged)| +-+ |
991 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
900 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
992 | | : |
901 | | : |
993 | +- User payload -+ |
902 | +- User payload -+ |
994 | : | |
903 | : | |
995 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
904 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
996 | |0| |
905 | |0| |
997 | +-+ |
906 | +-+ |
998 | Note that since we always merge adjacent free chunks, the chunks |
907 | Note that since we always merge adjacent free chunks, the chunks |
999 | adjacent to a free chunk must be in use. |
908 | adjacent to a free chunk must be in use. |
1000 | 909 | ||
1001 | Given a pointer to a chunk (which can be derived trivially from the |
910 | Given a pointer to a chunk (which can be derived trivially from the |
1002 | payload pointer) we can, in O(1) time, find out whether the adjacent |
911 | payload pointer) we can, in O(1) time, find out whether the adjacent |
1003 | chunks are free, and if so, unlink them from the lists that they |
912 | chunks are free, and if so, unlink them from the lists that they |
1004 | are on and merge them with the current chunk. |
913 | are on and merge them with the current chunk. |
1005 | 914 | ||
1006 | Chunks always begin on even word boundaries, so the mem portion |
915 | Chunks always begin on even word boundaries, so the mem portion |
1007 | (which is returned to the user) is also on an even word boundary, and |
916 | (which is returned to the user) is also on an even word boundary, and |
1008 | thus at least double-word aligned. |
917 | thus at least double-word aligned. |
1009 | 918 | ||
1010 | The P (PINUSE_BIT) bit, stored in the unused low-order bit of the |
919 | The P (PINUSE_BIT) bit, stored in the unused low-order bit of the |
1011 | chunk size (which is always a multiple of two words), is an in-use |
920 | chunk size (which is always a multiple of two words), is an in-use |
1012 | bit for the *previous* chunk. If that bit is *clear*, then the |
921 | bit for the *previous* chunk. If that bit is *clear*, then the |
1013 | word before the current chunk size contains the previous chunk |
922 | word before the current chunk size contains the previous chunk |
1014 | size, and can be used to find the front of the previous chunk. |
923 | size, and can be used to find the front of the previous chunk. |
1015 | The very first chunk allocated always has this bit set, preventing |
924 | The very first chunk allocated always has this bit set, preventing |
1016 | access to non-existent (or non-owned) memory. If pinuse is set for |
925 | access to non-existent (or non-owned) memory. If pinuse is set for |
1017 | any given chunk, then you CANNOT determine the size of the |
926 | any given chunk, then you CANNOT determine the size of the |
1018 | previous chunk, and might even get a memory addressing fault when |
927 | previous chunk, and might even get a memory addressing fault when |
1019 | trying to do so. |
928 | trying to do so. |
1020 | 929 | ||
1021 | The C (CINUSE_BIT) bit, stored in the unused second-lowest bit of |
930 | The C (CINUSE_BIT) bit, stored in the unused second-lowest bit of |
1022 | the chunk size redundantly records whether the current chunk is |
931 | the chunk size redundantly records whether the current chunk is |
1023 | inuse. This redundancy enables usage checks within free and realloc, |
932 | inuse. This redundancy enables usage checks within free and realloc, |
1024 | and reduces indirection when freeing and consolidating chunks. |
933 | and reduces indirection when freeing and consolidating chunks. |
1025 | 934 | ||
1026 | Each freshly allocated chunk must have both cinuse and pinuse set. |
935 | Each freshly allocated chunk must have both cinuse and pinuse set. |
1027 | That is, each allocated chunk borders either a previously allocated |
936 | That is, each allocated chunk borders either a previously allocated |
1028 | and still in-use chunk, or the base of its memory arena. This is |
937 | and still in-use chunk, or the base of its memory arena. This is |
1029 | ensured by making all allocations from the the `lowest' part of any |
938 | ensured by making all allocations from the the `lowest' part of any |
1030 | found chunk. Further, no free chunk physically borders another one, |
939 | found chunk. Further, no free chunk physically borders another one, |
1031 | so each free chunk is known to be preceded and followed by either |
940 | so each free chunk is known to be preceded and followed by either |
1032 | inuse chunks or the ends of memory. |
941 | inuse chunks or the ends of memory. |
1033 | 942 | ||
1034 | Note that the `foot' of the current chunk is actually represented |
943 | Note that the `foot' of the current chunk is actually represented |
1035 | as the prev_foot of the NEXT chunk. This makes it easier to |
944 | as the prev_foot of the NEXT chunk. This makes it easier to |
1036 | deal with alignments etc but can be very confusing when trying |
945 | deal with alignments etc but can be very confusing when trying |
1037 | to extend or adapt this code. |
946 | to extend or adapt this code. |
1038 | 947 | ||
1039 | The exceptions to all this are |
948 | The exceptions to all this are |
1040 | 949 | ||
1041 | 1. The special chunk `top' is the top-most available chunk (i.e., |
950 | 1. The special chunk `top' is the top-most available chunk (i.e., |
1042 | the one bordering the end of available memory). It is treated |
951 | the one bordering the end of available memory). It is treated |
1043 | specially. Top is never included in any bin, is used only if |
952 | specially. Top is never included in any bin, is used only if |
1044 | no other chunk is available, and is released back to the |
953 | no other chunk is available, and is released back to the |
1045 | system if it is very large (see M_TRIM_THRESHOLD). In effect, |
954 | system if it is very large (see M_TRIM_THRESHOLD). In effect, |
1046 | the top chunk is treated as larger (and thus less well |
955 | the top chunk is treated as larger (and thus less well |
1047 | fitting) than any other available chunk. The top chunk |
956 | fitting) than any other available chunk. The top chunk |
1048 | doesn't update its trailing size field since there is no next |
957 | doesn't update its trailing size field since there is no next |
1049 | contiguous chunk that would have to index off it. However, |
958 | contiguous chunk that would have to index off it. However, |
1050 | space is still allocated for it (TOP_FOOT_SIZE) to enable |
959 | space is still allocated for it (TOP_FOOT_SIZE) to enable |
1051 | separation or merging when space is extended. |
960 | separation or merging when space is extended. |
1052 | 961 | ||
1053 | 3. Chunks allocated via mmap, which have the lowest-order bit |
962 | 3. Chunks allocated via mmap, which have the lowest-order bit |
1054 | (IS_MMAPPED_BIT) set in their prev_foot fields, and do not set |
963 | (IS_MMAPPED_BIT) set in their prev_foot fields, and do not set |
1055 | PINUSE_BIT in their head fields. Because they are allocated |
964 | PINUSE_BIT in their head fields. Because they are allocated |
1056 | one-by-one, each must carry its own prev_foot field, which is |
965 | one-by-one, each must carry its own prev_foot field, which is |
1057 | also used to hold the offset this chunk has within its mmapped |
966 | also used to hold the offset this chunk has within its mmapped |
1058 | region, which is needed to preserve alignment. Each mmapped |
967 | region, which is needed to preserve alignment. Each mmapped |
1059 | chunk is trailed by the first two fields of a fake next-chunk |
968 | chunk is trailed by the first two fields of a fake next-chunk |
1060 | for sake of usage checks. |
969 | for sake of usage checks. |
1061 | 970 | ||
1062 | */ |
971 | */ |
1063 | 972 | ||
1064 | struct malloc_chunk { |
973 | struct malloc_chunk { |
1065 | size_t prev_foot; /* Size of previous chunk (if free). */ |
974 | size_t prev_foot; /* Size of previous chunk (if free). */ |
1066 | size_t head; /* Size and inuse bits. */ |
975 | size_t head; /* Size and inuse bits. */ |
1067 | struct malloc_chunk* fd; /* double links -- used only if free. */ |
976 | struct malloc_chunk* fd; /* double links -- used only if free. */ |
1068 | struct malloc_chunk* bk; |
977 | struct malloc_chunk* bk; |
1069 | }; |
978 | }; |
1070 | 979 | ||
1071 | typedef struct malloc_chunk mchunk; |
980 | typedef struct malloc_chunk mchunk; |
1072 | typedef struct malloc_chunk* mchunkptr; |
981 | typedef struct malloc_chunk* mchunkptr; |
1073 | typedef struct malloc_chunk* sbinptr; /* The type of bins of chunks */ |
982 | typedef struct malloc_chunk* sbinptr; /* The type of bins of chunks */ |
1074 | typedef unsigned int bindex_t; /* Described below */ |
983 | typedef unsigned int bindex_t; /* Described below */ |
1075 | typedef unsigned int binmap_t; /* Described below */ |
984 | typedef unsigned int binmap_t; /* Described below */ |
1076 | typedef unsigned int flag_t; /* The type of various bit flag sets */ |
985 | typedef unsigned int flag_t; /* The type of various bit flag sets */ |
1077 | 986 | ||
1078 | /* ------------------- Chunks sizes and alignments ----------------------- */ |
987 | /* ------------------- Chunks sizes and alignments ----------------------- */ |
1079 | 988 | ||
1080 | #define MCHUNK_SIZE (sizeof(mchunk)) |
989 | #define MCHUNK_SIZE (sizeof(mchunk)) |
1081 | 990 | ||
1082 | #if FOOTERS |
991 | #if FOOTERS |
1083 | #define CHUNK_OVERHEAD (TWO_SIZE_T_SIZES) |
992 | #define CHUNK_OVERHEAD (TWO_SIZE_T_SIZES) |
1084 | #else /* FOOTERS */ |
993 | #else /* FOOTERS */ |
1085 | #define CHUNK_OVERHEAD (SIZE_T_SIZE) |
994 | #define CHUNK_OVERHEAD (SIZE_T_SIZE) |
1086 | #endif /* FOOTERS */ |
995 | #endif /* FOOTERS */ |
1087 | 996 | ||
1088 | /* MMapped chunks need a second word of overhead ... */ |
997 | /* MMapped chunks need a second word of overhead ... */ |
1089 | #define MMAP_CHUNK_OVERHEAD (TWO_SIZE_T_SIZES) |
998 | #define MMAP_CHUNK_OVERHEAD (TWO_SIZE_T_SIZES) |
1090 | /* ... and additional padding for fake next-chunk at foot */ |
999 | /* ... and additional padding for fake next-chunk at foot */ |
1091 | #define MMAP_FOOT_PAD (FOUR_SIZE_T_SIZES) |
1000 | #define MMAP_FOOT_PAD (FOUR_SIZE_T_SIZES) |
1092 | 1001 | ||
1093 | /* The smallest size we can malloc is an aligned minimal chunk */ |
1002 | /* The smallest size we can malloc is an aligned minimal chunk */ |
1094 | #define MIN_CHUNK_SIZE\ |
1003 | #define MIN_CHUNK_SIZE\ |
1095 | ((MCHUNK_SIZE + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK) |
1004 | ((MCHUNK_SIZE + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK) |
1096 | 1005 | ||
1097 | /* conversion from malloc headers to user pointers, and back */ |
1006 | /* conversion from malloc headers to user pointers, and back */ |
1098 | #define chunk2mem(p) ((void*)((char*)(p) + TWO_SIZE_T_SIZES)) |
1007 | #define chunk2mem(p) ((void*)((char*)(p) + TWO_SIZE_T_SIZES)) |
1099 | #define mem2chunk(mem) ((mchunkptr)((char*)(mem) - TWO_SIZE_T_SIZES)) |
1008 | #define mem2chunk(mem) ((mchunkptr)((char*)(mem) - TWO_SIZE_T_SIZES)) |
1100 | /* chunk associated with aligned address A */ |
1009 | /* chunk associated with aligned address A */ |
1101 | #define align_as_chunk(A) (mchunkptr)((A) + align_offset(chunk2mem(A))) |
1010 | #define align_as_chunk(A) (mchunkptr)((A) + align_offset(chunk2mem(A))) |
1102 | 1011 | ||
1103 | /* Bounds on request (not chunk) sizes. */ |
1012 | /* Bounds on request (not chunk) sizes. */ |
1104 | #define MAX_REQUEST ((-MIN_CHUNK_SIZE) << 2) |
1013 | #define MAX_REQUEST ((-MIN_CHUNK_SIZE) << 2) |
1105 | #define MIN_REQUEST (MIN_CHUNK_SIZE - CHUNK_OVERHEAD - SIZE_T_ONE) |
1014 | #define MIN_REQUEST (MIN_CHUNK_SIZE - CHUNK_OVERHEAD - SIZE_T_ONE) |
1106 | 1015 | ||
1107 | /* pad request bytes into a usable size */ |
1016 | /* pad request bytes into a usable size */ |
1108 | #define pad_request(req) \ |
1017 | #define pad_request(req) \ |
1109 | (((req) + CHUNK_OVERHEAD + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK) |
1018 | (((req) + CHUNK_OVERHEAD + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK) |
1110 | 1019 | ||
1111 | /* pad request, checking for minimum (but not maximum) */ |
1020 | /* pad request, checking for minimum (but not maximum) */ |
1112 | #define request2size(req) \ |
1021 | #define request2size(req) \ |
1113 | (((req) < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(req)) |
1022 | (((req) < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(req)) |
1114 | 1023 | ||
1115 | 1024 | ||
1116 | /* ------------------ Operations on head and foot fields ----------------- */ |
1025 | /* ------------------ Operations on head and foot fields ----------------- */ |
1117 | 1026 | ||
1118 | /* |
1027 | /* |
1119 | The head field of a chunk is or'ed with PINUSE_BIT when previous |
1028 | The head field of a chunk is or'ed with PINUSE_BIT when previous |
1120 | adjacent chunk in use, and or'ed with CINUSE_BIT if this chunk is in |
1029 | adjacent chunk in use, and or'ed with CINUSE_BIT if this chunk is in |
1121 | use. If the chunk was obtained with mmap, the prev_foot field has |
1030 | use. If the chunk was obtained with mmap, the prev_foot field has |
1122 | IS_MMAPPED_BIT set, otherwise holding the offset of the base of the |
1031 | IS_MMAPPED_BIT set, otherwise holding the offset of the base of the |
1123 | mmapped region to the base of the chunk. |
1032 | mmapped region to the base of the chunk. |
1124 | */ |
1033 | */ |
1125 | 1034 | ||
1126 | #define PINUSE_BIT (SIZE_T_ONE) |
1035 | #define PINUSE_BIT (SIZE_T_ONE) |
1127 | #define CINUSE_BIT (SIZE_T_TWO) |
1036 | #define CINUSE_BIT (SIZE_T_TWO) |
1128 | #define INUSE_BITS (PINUSE_BIT|CINUSE_BIT) |
1037 | #define INUSE_BITS (PINUSE_BIT|CINUSE_BIT) |
1129 | 1038 | ||
1130 | /* Head value for fenceposts */ |
1039 | /* Head value for fenceposts */ |
1131 | #define FENCEPOST_HEAD (INUSE_BITS|SIZE_T_SIZE) |
1040 | #define FENCEPOST_HEAD (INUSE_BITS|SIZE_T_SIZE) |
1132 | 1041 | ||
1133 | /* extraction of fields from head words */ |
1042 | /* extraction of fields from head words */ |
1134 | #define cinuse(p) ((p)->head & CINUSE_BIT) |
1043 | #define cinuse(p) ((p)->head & CINUSE_BIT) |
1135 | #define pinuse(p) ((p)->head & PINUSE_BIT) |
1044 | #define pinuse(p) ((p)->head & PINUSE_BIT) |
1136 | #define chunksize(p) ((p)->head & ~(INUSE_BITS)) |
1045 | #define chunksize(p) ((p)->head & ~(INUSE_BITS)) |
1137 | 1046 | ||
1138 | #define clear_pinuse(p) ((p)->head &= ~PINUSE_BIT) |
1047 | #define clear_pinuse(p) ((p)->head &= ~PINUSE_BIT) |
1139 | #define clear_cinuse(p) ((p)->head &= ~CINUSE_BIT) |
1048 | #define clear_cinuse(p) ((p)->head &= ~CINUSE_BIT) |
1140 | 1049 | ||
1141 | /* Treat space at ptr +/- offset as a chunk */ |
1050 | /* Treat space at ptr +/- offset as a chunk */ |
1142 | #define chunk_plus_offset(p, s) ((mchunkptr)(((char*)(p)) + (s))) |
1051 | #define chunk_plus_offset(p, s) ((mchunkptr)(((char*)(p)) + (s))) |
1143 | #define chunk_minus_offset(p, s) ((mchunkptr)(((char*)(p)) - (s))) |
1052 | #define chunk_minus_offset(p, s) ((mchunkptr)(((char*)(p)) - (s))) |
1144 | 1053 | ||
1145 | /* Ptr to next or previous physical malloc_chunk. */ |
1054 | /* Ptr to next or previous physical malloc_chunk. */ |
1146 | #define next_chunk(p) ((mchunkptr)( ((char*)(p)) + ((p)->head & ~INUSE_BITS))) |
1055 | #define next_chunk(p) ((mchunkptr)( ((char*)(p)) + ((p)->head & ~INUSE_BITS))) |
1147 | #define prev_chunk(p) ((mchunkptr)( ((char*)(p)) - ((p)->prev_foot) )) |
1056 | #define prev_chunk(p) ((mchunkptr)( ((char*)(p)) - ((p)->prev_foot) )) |
1148 | 1057 | ||
1149 | /* extract next chunk's pinuse bit */ |
1058 | /* extract next chunk's pinuse bit */ |
1150 | #define next_pinuse(p) ((next_chunk(p)->head) & PINUSE_BIT) |
1059 | #define next_pinuse(p) ((next_chunk(p)->head) & PINUSE_BIT) |
1151 | 1060 | ||
1152 | /* Get/set size at footer */ |
1061 | /* Get/set size at footer */ |
1153 | #define get_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot) |
1062 | #define get_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot) |
1154 | #define set_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot = (s)) |
1063 | #define set_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot = (s)) |
1155 | 1064 | ||
1156 | /* Set size, pinuse bit, and foot */ |
1065 | /* Set size, pinuse bit, and foot */ |
1157 | #define set_size_and_pinuse_of_free_chunk(p, s)\ |
1066 | #define set_size_and_pinuse_of_free_chunk(p, s)\ |
1158 | ((p)->head = (s|PINUSE_BIT), set_foot(p, s)) |
1067 | ((p)->head = (s|PINUSE_BIT), set_foot(p, s)) |
1159 | 1068 | ||
1160 | /* Set size, pinuse bit, foot, and clear next pinuse */ |
1069 | /* Set size, pinuse bit, foot, and clear next pinuse */ |
1161 | #define set_free_with_pinuse(p, s, n)\ |
1070 | #define set_free_with_pinuse(p, s, n)\ |
1162 | (clear_pinuse(n), set_size_and_pinuse_of_free_chunk(p, s)) |
1071 | (clear_pinuse(n), set_size_and_pinuse_of_free_chunk(p, s)) |
1163 | 1072 | ||
1164 | #define is_mmapped(p)\ |
1073 | #define is_mmapped(p)\ |
1165 | (!((p)->head & PINUSE_BIT) && ((p)->prev_foot & IS_MMAPPED_BIT)) |
1074 | (!((p)->head & PINUSE_BIT) && ((p)->prev_foot & IS_MMAPPED_BIT)) |
1166 | 1075 | ||
1167 | /* Get the internal overhead associated with chunk p */ |
1076 | /* Get the internal overhead associated with chunk p */ |
1168 | #define overhead_for(p)\ |
1077 | #define overhead_for(p)\ |
1169 | (is_mmapped(p)? MMAP_CHUNK_OVERHEAD : CHUNK_OVERHEAD) |
1078 | (is_mmapped(p)? MMAP_CHUNK_OVERHEAD : CHUNK_OVERHEAD) |
1170 | 1079 | ||
1171 | /* Return true if malloced space is not necessarily cleared */ |
1080 | /* Return true if malloced space is not necessarily cleared */ |
1172 | #if MMAP_CLEARS |
1081 | #if MMAP_CLEARS |
1173 | #define calloc_must_clear(p) (!is_mmapped(p)) |
1082 | #define calloc_must_clear(p) (!is_mmapped(p)) |
1174 | #else /* MMAP_CLEARS */ |
1083 | #else /* MMAP_CLEARS */ |
1175 | #define calloc_must_clear(p) (1) |
1084 | #define calloc_must_clear(p) (1) |
1176 | #endif /* MMAP_CLEARS */ |
1085 | #endif /* MMAP_CLEARS */ |
1177 | 1086 | ||
1178 | /* ---------------------- Overlaid data structures ----------------------- */ |
1087 | /* ---------------------- Overlaid data structures ----------------------- */ |
1179 | 1088 | ||
1180 | /* |
1089 | /* |
1181 | When chunks are not in use, they are treated as nodes of either |
1090 | When chunks are not in use, they are treated as nodes of either |
1182 | lists or trees. |
1091 | lists or trees. |
1183 | 1092 | ||
1184 | "Small" chunks are stored in circular doubly-linked lists, and look |
1093 | "Small" chunks are stored in circular doubly-linked lists, and look |
1185 | like this: |
1094 | like this: |
1186 | 1095 | ||
1187 | chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1096 | chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1188 | | Size of previous chunk | |
1097 | | Size of previous chunk | |
1189 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1098 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1190 | `head:' | Size of chunk, in bytes |P| |
1099 | `head:' | Size of chunk, in bytes |P| |
1191 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1100 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1192 | | Forward pointer to next chunk in list | |
1101 | | Forward pointer to next chunk in list | |
1193 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1102 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1194 | | Back pointer to previous chunk in list | |
1103 | | Back pointer to previous chunk in list | |
1195 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1104 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1196 | | Unused space (may be 0 bytes long) . |
1105 | | Unused space (may be 0 bytes long) . |
1197 | . . |
1106 | . . |
1198 | . | |
1107 | . | |
1199 | nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1108 | nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1200 | `foot:' | Size of chunk, in bytes | |
1109 | `foot:' | Size of chunk, in bytes | |
1201 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1110 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1202 | 1111 | ||
1203 | Larger chunks are kept in a form of bitwise digital trees (aka |
1112 | Larger chunks are kept in a form of bitwise digital trees (aka |
1204 | tries) keyed on chunksizes. Because malloc_tree_chunks are only for |
1113 | tries) keyed on chunksizes. Because malloc_tree_chunks are only for |
1205 | free chunks greater than 256 bytes, their size doesn't impose any |
1114 | free chunks greater than 256 bytes, their size doesn't impose any |
1206 | constraints on user chunk sizes. Each node looks like: |
1115 | constraints on user chunk sizes. Each node looks like: |
1207 | 1116 | ||
1208 | chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1117 | chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1209 | | Size of previous chunk | |
1118 | | Size of previous chunk | |
1210 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1119 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1211 | `head:' | Size of chunk, in bytes |P| |
1120 | `head:' | Size of chunk, in bytes |P| |
1212 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1121 | mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1213 | | Forward pointer to next chunk of same size | |
1122 | | Forward pointer to next chunk of same size | |
1214 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1123 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1215 | | Back pointer to previous chunk of same size | |
1124 | | Back pointer to previous chunk of same size | |
1216 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1125 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1217 | | Pointer to left child (child[0]) | |
1126 | | Pointer to left child (child[0]) | |
1218 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1127 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1219 | | Pointer to right child (child[1]) | |
1128 | | Pointer to right child (child[1]) | |
1220 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1129 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1221 | | Pointer to parent | |
1130 | | Pointer to parent | |
1222 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1131 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1223 | | bin index of this chunk | |
1132 | | bin index of this chunk | |
1224 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1133 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1225 | | Unused space . |
1134 | | Unused space . |
1226 | . | |
1135 | . | |
1227 | nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1136 | nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1228 | `foot:' | Size of chunk, in bytes | |
1137 | `foot:' | Size of chunk, in bytes | |
1229 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1138 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
1230 | 1139 | ||
1231 | Each tree holding treenodes is a tree of unique chunk sizes. Chunks |
1140 | Each tree holding treenodes is a tree of unique chunk sizes. Chunks |
1232 | of the same size are arranged in a circularly-linked list, with only |
1141 | of the same size are arranged in a circularly-linked list, with only |
1233 | the oldest chunk (the next to be used, in our FIFO ordering) |
1142 | the oldest chunk (the next to be used, in our FIFO ordering) |
1234 | actually in the tree. (Tree members are distinguished by a non-null |
1143 | actually in the tree. (Tree members are distinguished by a non-null |
1235 | parent pointer.) If a chunk with the same size an an existing node |
1144 | parent pointer.) If a chunk with the same size an an existing node |
1236 | is inserted, it is linked off the existing node using pointers that |
1145 | is inserted, it is linked off the existing node using pointers that |
1237 | work in the same way as fd/bk pointers of small chunks. |
1146 | work in the same way as fd/bk pointers of small chunks. |
1238 | 1147 | ||
1239 | Each tree contains a power of 2 sized range of chunk sizes (the |
1148 | Each tree contains a power of 2 sized range of chunk sizes (the |
1240 | smallest is 0x100 <= x < 0x180), which is is divided in half at each |
1149 | smallest is 0x100 <= x < 0x180), which is is divided in half at each |
1241 | tree level, with the chunks in the smaller half of the range (0x100 |
1150 | tree level, with the chunks in the smaller half of the range (0x100 |
1242 | <= x < 0x140 for the top nose) in the left subtree and the larger |
1151 | <= x < 0x140 for the top nose) in the left subtree and the larger |
1243 | half (0x140 <= x < 0x180) in the right subtree. This is, of course, |
1152 | half (0x140 <= x < 0x180) in the right subtree. This is, of course, |
1244 | done by inspecting individual bits. |
1153 | done by inspecting individual bits. |
1245 | 1154 | ||
1246 | Using these rules, each node's left subtree contains all smaller |
1155 | Using these rules, each node's left subtree contains all smaller |
1247 | sizes than its right subtree. However, the node at the root of each |
1156 | sizes than its right subtree. However, the node at the root of each |
1248 | subtree has no particular ordering relationship to either. (The |
1157 | subtree has no particular ordering relationship to either. (The |
1249 | dividing line between the subtree sizes is based on trie relation.) |
1158 | dividing line between the subtree sizes is based on trie relation.) |
1250 | If we remove the last chunk of a given size from the interior of the |
1159 | If we remove the last chunk of a given size from the interior of the |
1251 | tree, we need to replace it with a leaf node. The tree ordering |
1160 | tree, we need to replace it with a leaf node. The tree ordering |
1252 | rules permit a node to be replaced by any leaf below it. |
1161 | rules permit a node to be replaced by any leaf below it. |
1253 | 1162 | ||
1254 | The smallest chunk in a tree (a common operation in a best-fit |
1163 | The smallest chunk in a tree (a common operation in a best-fit |
1255 | allocator) can be found by walking a path to the leftmost leaf in |
1164 | allocator) can be found by walking a path to the leftmost leaf in |
1256 | the tree. Unlike a usual binary tree, where we follow left child |
1165 | the tree. Unlike a usual binary tree, where we follow left child |
1257 | pointers until we reach a null, here we follow the right child |
1166 | pointers until we reach a null, here we follow the right child |
1258 | pointer any time the left one is null, until we reach a leaf with |
1167 | pointer any time the left one is null, until we reach a leaf with |
1259 | both child pointers null. The smallest chunk in the tree will be |
1168 | both child pointers null. The smallest chunk in the tree will be |
1260 | somewhere along that path. |
1169 | somewhere along that path. |
1261 | 1170 | ||
1262 | The worst case number of steps to add, find, or remove a node is |
1171 | The worst case number of steps to add, find, or remove a node is |
1263 | bounded by the number of bits differentiating chunks within |
1172 | bounded by the number of bits differentiating chunks within |
1264 | bins. Under current bin calculations, this ranges from 6 up to 21 |
1173 | bins. Under current bin calculations, this ranges from 6 up to 21 |
1265 | (for 32 bit sizes) or up to 53 (for 64 bit sizes). The typical case |
1174 | (for 32 bit sizes) or up to 53 (for 64 bit sizes). The typical case |
1266 | is of course much better. |
1175 | is of course much better. |
1267 | */ |
1176 | */ |
1268 | 1177 | ||
1269 | struct malloc_tree_chunk { |
1178 | struct malloc_tree_chunk { |
1270 | /* The first four fields must be compatible with malloc_chunk */ |
1179 | /* The first four fields must be compatible with malloc_chunk */ |
1271 | size_t prev_foot; |
1180 | size_t prev_foot; |
1272 | size_t head; |
1181 | size_t head; |
1273 | struct malloc_tree_chunk* fd; |
1182 | struct malloc_tree_chunk* fd; |
1274 | struct malloc_tree_chunk* bk; |
1183 | struct malloc_tree_chunk* bk; |
1275 | 1184 | ||
1276 | struct malloc_tree_chunk* child[2]; |
1185 | struct malloc_tree_chunk* child[2]; |
1277 | struct malloc_tree_chunk* parent; |
1186 | struct malloc_tree_chunk* parent; |
1278 | bindex_t index; |
1187 | bindex_t index; |
1279 | }; |
1188 | }; |
1280 | 1189 | ||
1281 | typedef struct malloc_tree_chunk tchunk; |
1190 | typedef struct malloc_tree_chunk tchunk; |
1282 | typedef struct malloc_tree_chunk* tchunkptr; |
1191 | typedef struct malloc_tree_chunk* tchunkptr; |
1283 | typedef struct malloc_tree_chunk* tbinptr; /* The type of bins of trees */ |
1192 | typedef struct malloc_tree_chunk* tbinptr; /* The type of bins of trees */ |
1284 | 1193 | ||
1285 | /* A little helper macro for trees */ |
1194 | /* A little helper macro for trees */ |
1286 | #define leftmost_child(t) ((t)->child[0] != 0? (t)->child[0] : (t)->child[1]) |
1195 | #define leftmost_child(t) ((t)->child[0] != 0? (t)->child[0] : (t)->child[1]) |
1287 | 1196 | ||
1288 | /* ----------------------------- Segments -------------------------------- */ |
1197 | /* ----------------------------- Segments -------------------------------- */ |
1289 | 1198 | ||
1290 | /* |
1199 | /* |
1291 | Each malloc space may include non-contiguous segments, held in a |
1200 | Each malloc space may include non-contiguous segments, held in a |
1292 | list headed by an embedded malloc_segment record representing the |
1201 | list headed by an embedded malloc_segment record representing the |
1293 | top-most space. Segments also include flags holding properties of |
1202 | top-most space. Segments also include flags holding properties of |
1294 | the space. Large chunks that are directly allocated by mmap are not |
1203 | the space. Large chunks that are directly allocated by mmap are not |
1295 | included in this list. They are instead independently created and |
1204 | included in this list. They are instead independently created and |
1296 | destroyed without otherwise keeping track of them. |
1205 | destroyed without otherwise keeping track of them. |
1297 | 1206 | ||
1298 | Segment management mainly comes into play for spaces allocated by |
1207 | Segment management mainly comes into play for spaces allocated by |
1299 | MMAP. Any call to MMAP might or might not return memory that is |
1208 | MMAP. Any call to MMAP might or might not return memory that is |
1300 | adjacent to an existing segment. MORECORE normally contiguously |
1209 | adjacent to an existing segment. MORECORE normally contiguously |
1301 | extends the current space, so this space is almost always adjacent, |
1210 | extends the current space, so this space is almost always adjacent, |
1302 | which is simpler and faster to deal with. (This is why MORECORE is |
1211 | which is simpler and faster to deal with. (This is why MORECORE is |
1303 | used preferentially to MMAP when both are available -- see |
1212 | used preferentially to MMAP when both are available -- see |
1304 | sys_alloc.) When allocating using MMAP, we don't use any of the |
1213 | sys_alloc.) When allocating using MMAP, we don't use any of the |
1305 | hinting mechanisms (inconsistently) supported in various |
1214 | hinting mechanisms (inconsistently) supported in various |
1306 | implementations of unix mmap, or distinguish reserving from |
1215 | implementations of unix mmap, or distinguish reserving from |
1307 | committing memory. Instead, we just ask for space, and exploit |
1216 | committing memory. Instead, we just ask for space, and exploit |
1308 | contiguity when we get it. It is probably possible to do |
1217 | contiguity when we get it. It is probably possible to do |
1309 | better than this on some systems, but no general scheme seems |
1218 | better than this on some systems, but no general scheme seems |
1310 | to be significantly better. |
1219 | to be significantly better. |
1311 | 1220 | ||
1312 | Management entails a simpler variant of the consolidation scheme |
1221 | Management entails a simpler variant of the consolidation scheme |
1313 | used for chunks to reduce fragmentation -- new adjacent memory is |
1222 | used for chunks to reduce fragmentation -- new adjacent memory is |
1314 | normally prepended or appended to an existing segment. However, |
1223 | normally prepended or appended to an existing segment. However, |
1315 | there are limitations compared to chunk consolidation that mostly |
1224 | there are limitations compared to chunk consolidation that mostly |
1316 | reflect the fact that segment processing is relatively infrequent |
1225 | reflect the fact that segment processing is relatively infrequent |
1317 | (occurring only when getting memory from system) and that we |
1226 | (occurring only when getting memory from system) and that we |
1318 | don't expect to have huge numbers of segments: |
1227 | don't expect to have huge numbers of segments: |
1319 | 1228 | ||
1320 | * Segments are not indexed, so traversal requires linear scans. (It |
1229 | * Segments are not indexed, so traversal requires linear scans. (It |
1321 | would be possible to index these, but is not worth the extra |
1230 | would be possible to index these, but is not worth the extra |
1322 | overhead and complexity for most programs on most platforms.) |
1231 | overhead and complexity for most programs on most platforms.) |
1323 | * New segments are only appended to old ones when holding top-most |
1232 | * New segments are only appended to old ones when holding top-most |
1324 | memory; if they cannot be prepended to others, they are held in |
1233 | memory; if they cannot be prepended to others, they are held in |
1325 | different segments. |
1234 | different segments. |
1326 | 1235 | ||
1327 | Except for the top-most segment of an mstate, each segment record |
1236 | Except for the top-most segment of an mstate, each segment record |
1328 | is kept at the tail of its segment. Segments are added by pushing |
1237 | is kept at the tail of its segment. Segments are added by pushing |
1329 | segment records onto the list headed by &mstate.seg for the |
1238 | segment records onto the list headed by &mstate.seg for the |
1330 | containing mstate. |
1239 | containing mstate. |
1331 | 1240 | ||
1332 | Segment flags control allocation/merge/deallocation policies: |
1241 | Segment flags control allocation/merge/deallocation policies: |
1333 | * If EXTERN_BIT set, then we did not allocate this segment, |
1242 | * If EXTERN_BIT set, then we did not allocate this segment, |
1334 | and so should not try to deallocate or merge with others. |
1243 | and so should not try to deallocate or merge with others. |
1335 | (This currently holds only for the initial segment passed |
1244 | (This currently holds only for the initial segment passed |
1336 | into create_mspace_with_base.) |
1245 | into create_mspace_with_base.) |
1337 | * If IS_MMAPPED_BIT set, the segment may be merged with |
1246 | * If IS_MMAPPED_BIT set, the segment may be merged with |
1338 | other surrounding mmapped segments and trimmed/de-allocated |
1247 | other surrounding mmapped segments and trimmed/de-allocated |
1339 | using munmap. |
1248 | using munmap. |
1340 | * If neither bit is set, then the segment was obtained using |
1249 | * If neither bit is set, then the segment was obtained using |
1341 | MORECORE so can be merged with surrounding MORECORE'd segments |
1250 | MORECORE so can be merged with surrounding MORECORE'd segments |
1342 | and deallocated/trimmed using MORECORE with negative arguments. |
1251 | and deallocated/trimmed using MORECORE with negative arguments. |
1343 | */ |
1252 | */ |
1344 | 1253 | ||
1345 | struct malloc_segment { |
1254 | struct malloc_segment { |
1346 | char* base; /* base address */ |
1255 | char* base; /* base address */ |
1347 | size_t size; /* allocated size */ |
1256 | size_t size; /* allocated size */ |
1348 | struct malloc_segment* next; /* ptr to next segment */ |
1257 | struct malloc_segment* next; /* ptr to next segment */ |
1349 | flag_t sflags; /* mmap and extern flag */ |
1258 | flag_t sflags; /* mmap and extern flag */ |
1350 | }; |
1259 | }; |
1351 | 1260 | ||
1352 | #define is_mmapped_segment(S) ((S)->sflags & IS_MMAPPED_BIT) |
1261 | #define is_mmapped_segment(S) ((S)->sflags & IS_MMAPPED_BIT) |
1353 | #define is_extern_segment(S) ((S)->sflags & EXTERN_BIT) |
1262 | #define is_extern_segment(S) ((S)->sflags & EXTERN_BIT) |
1354 | 1263 | ||
1355 | typedef struct malloc_segment msegment; |
1264 | typedef struct malloc_segment msegment; |
1356 | typedef struct malloc_segment* msegmentptr; |
1265 | typedef struct malloc_segment* msegmentptr; |
1357 | 1266 | ||
1358 | /* ---------------------------- malloc_state ----------------------------- */ |
1267 | /* ---------------------------- malloc_state ----------------------------- */ |
1359 | 1268 | ||
1360 | /* |
1269 | /* |
1361 | A malloc_state holds all of the bookkeeping for a space. |
1270 | A malloc_state holds all of the bookkeeping for a space. |
1362 | The main fields are: |
1271 | The main fields are: |
1363 | 1272 | ||
1364 | Top |
1273 | Top |
1365 | The topmost chunk of the currently active segment. Its size is |
1274 | The topmost chunk of the currently active segment. Its size is |
1366 | cached in topsize. The actual size of topmost space is |
1275 | cached in topsize. The actual size of topmost space is |
1367 | topsize+TOP_FOOT_SIZE, which includes space reserved for adding |
1276 | topsize+TOP_FOOT_SIZE, which includes space reserved for adding |
1368 | fenceposts and segment records if necessary when getting more |
1277 | fenceposts and segment records if necessary when getting more |
1369 | space from the system. The size at which to autotrim top is |
1278 | space from the system. The size at which to autotrim top is |
1370 | cached from mparams in trim_check, except that it is disabled if |
1279 | cached from mparams in trim_check, except that it is disabled if |
1371 | an autotrim fails. |
1280 | an autotrim fails. |
1372 | 1281 | ||
1373 | Designated victim (dv) |
1282 | Designated victim (dv) |
1374 | This is the preferred chunk for servicing small requests that |
1283 | This is the preferred chunk for servicing small requests that |
1375 | don't have exact fits. It is normally the chunk split off most |
1284 | don't have exact fits. It is normally the chunk split off most |
1376 | recently to service another small request. Its size is cached in |
1285 | recently to service another small request. Its size is cached in |
1377 | dvsize. The link fields of this chunk are not maintained since it |
1286 | dvsize. The link fields of this chunk are not maintained since it |
1378 | is not kept in a bin. |
1287 | is not kept in a bin. |
1379 | 1288 | ||
1380 | SmallBins |
1289 | SmallBins |
1381 | An array of bin headers for free chunks. These bins hold chunks |
1290 | An array of bin headers for free chunks. These bins hold chunks |
1382 | with sizes less than MIN_LARGE_SIZE bytes. Each bin contains |
1291 | with sizes less than MIN_LARGE_SIZE bytes. Each bin contains |
1383 | chunks of all the same size, spaced 8 bytes apart. To simplify |
1292 | chunks of all the same size, spaced 8 bytes apart. To simplify |
1384 | use in double-linked lists, each bin header acts as a malloc_chunk |
1293 | use in double-linked lists, each bin header acts as a malloc_chunk |
1385 | pointing to the real first node, if it exists (else pointing to |
1294 | pointing to the real first node, if it exists (else pointing to |
1386 | itself). This avoids special-casing for headers. But to avoid |
1295 | itself). This avoids special-casing for headers. But to avoid |
1387 | waste, we allocate only the fd/bk pointers of bins, and then use |
1296 | waste, we allocate only the fd/bk pointers of bins, and then use |
1388 | repositioning tricks to treat these as the fields of a chunk. |
1297 | repositioning tricks to treat these as the fields of a chunk. |
1389 | 1298 | ||
1390 | TreeBins |
1299 | TreeBins |
1391 | Treebins are pointers to the roots of trees holding a range of |
1300 | Treebins are pointers to the roots of trees holding a range of |
1392 | sizes. There are 2 equally spaced treebins for each power of two |
1301 | sizes. There are 2 equally spaced treebins for each power of two |
1393 | from TREE_SHIFT to TREE_SHIFT+16. The last bin holds anything |
1302 | from TREE_SHIFT to TREE_SHIFT+16. The last bin holds anything |
1394 | larger. |
1303 | larger. |
1395 | 1304 | ||
1396 | Bin maps |
1305 | Bin maps |
1397 | There is one bit map for small bins ("smallmap") and one for |
1306 | There is one bit map for small bins ("smallmap") and one for |
1398 | treebins ("treemap). Each bin sets its bit when non-empty, and |
1307 | treebins ("treemap). Each bin sets its bit when non-empty, and |
1399 | clears the bit when empty. Bit operations are then used to avoid |
1308 | clears the bit when empty. Bit operations are then used to avoid |
1400 | bin-by-bin searching -- nearly all "search" is done without ever |
1309 | bin-by-bin searching -- nearly all "search" is done without ever |
1401 | looking at bins that won't be selected. The bit maps |
1310 | looking at bins that won't be selected. The bit maps |
1402 | conservatively use 32 bits per map word, even if on 64bit system. |
1311 | conservatively use 32 bits per map word, even if on 64bit system. |
1403 | For a good description of some of the bit-based techniques used |
1312 | For a good description of some of the bit-based techniques used |
1404 | here, see Henry S. Warren Jr's book "Hacker's Delight" (and |
1313 | here, see Henry S. Warren Jr's book "Hacker's Delight" (and |
1405 | supplement at http://hackersdelight.org/). Many of these are |
1314 | supplement at http://hackersdelight.org/). Many of these are |
1406 | intended to reduce the branchiness of paths through malloc etc, as |
1315 | intended to reduce the branchiness of paths through malloc etc, as |
1407 | well as to reduce the number of memory locations read or written. |
1316 | well as to reduce the number of memory locations read or written. |
1408 | 1317 | ||
1409 | Segments |
1318 | Segments |
1410 | A list of segments headed by an embedded malloc_segment record |
1319 | A list of segments headed by an embedded malloc_segment record |
1411 | representing the initial space. |
1320 | representing the initial space. |
1412 | 1321 | ||
1413 | Address check support |
1322 | Address check support |
1414 | The least_addr field is the least address ever obtained from |
1323 | The least_addr field is the least address ever obtained from |
1415 | MORECORE or MMAP. Attempted frees and reallocs of any address less |
1324 | MORECORE or MMAP. Attempted frees and reallocs of any address less |
1416 | than this are trapped (unless INSECURE is defined). |
1325 | than this are trapped (unless INSECURE is defined). |
1417 | 1326 | ||
1418 | Magic tag |
1327 | Magic tag |
1419 | A cross-check field that should always hold same value as mparams.magic. |
1328 | A cross-check field that should always hold same value as mparams.magic. |
1420 | 1329 | ||
1421 | Flags |
1330 | Flags |
1422 | Bits recording whether to use MMAP, locks, or contiguous MORECORE |
1331 | Bits recording whether to use MMAP, locks, or contiguous MORECORE |
1423 | 1332 | ||
1424 | Statistics |
1333 | Statistics |
1425 | Each space keeps track of current and maximum system memory |
1334 | Each space keeps track of current and maximum system memory |
1426 | obtained via MORECORE or MMAP. |
1335 | obtained via MORECORE or MMAP. |
1427 | 1336 | ||
1428 | Locking |
1337 | Locking |
1429 | If USE_LOCKS is defined, the "mutex" lock is acquired and released |
1338 | If USE_LOCKS is defined, the "mutex" lock is acquired and released |
1430 | around every public call using this mspace. |
1339 | around every public call using this mspace. |
1431 | */ |
1340 | */ |
1432 | 1341 | ||
1433 | /* Bin types, widths and sizes */ |
1342 | /* Bin types, widths and sizes */ |
1434 | #define NSMALLBINS (32U) |
1343 | #define NSMALLBINS (32U) |
1435 | #define NTREEBINS (32U) |
1344 | #define NTREEBINS (32U) |
1436 | #define SMALLBIN_SHIFT (3U) |
1345 | #define SMALLBIN_SHIFT (3U) |
1437 | #define SMALLBIN_WIDTH (SIZE_T_ONE << SMALLBIN_SHIFT) |
1346 | #define SMALLBIN_WIDTH (SIZE_T_ONE << SMALLBIN_SHIFT) |
1438 | #define TREEBIN_SHIFT (8U) |
1347 | #define TREEBIN_SHIFT (8U) |
1439 | #define MIN_LARGE_SIZE (SIZE_T_ONE << TREEBIN_SHIFT) |
1348 | #define MIN_LARGE_SIZE (SIZE_T_ONE << TREEBIN_SHIFT) |
1440 | #define MAX_SMALL_SIZE (MIN_LARGE_SIZE - SIZE_T_ONE) |
1349 | #define MAX_SMALL_SIZE (MIN_LARGE_SIZE - SIZE_T_ONE) |
1441 | #define MAX_SMALL_REQUEST (MAX_SMALL_SIZE - CHUNK_ALIGN_MASK - CHUNK_OVERHEAD) |
1350 | #define MAX_SMALL_REQUEST (MAX_SMALL_SIZE - CHUNK_ALIGN_MASK - CHUNK_OVERHEAD) |
1442 | 1351 | ||
1443 | struct malloc_state { |
1352 | struct malloc_state { |
1444 | binmap_t smallmap; |
1353 | binmap_t smallmap; |
1445 | binmap_t treemap; |
1354 | binmap_t treemap; |
1446 | size_t dvsize; |
1355 | size_t dvsize; |
1447 | size_t topsize; |
1356 | size_t topsize; |
1448 | char* least_addr; |
1357 | char* least_addr; |
1449 | mchunkptr dv; |
1358 | mchunkptr dv; |
1450 | mchunkptr top; |
1359 | mchunkptr top; |
1451 | size_t trim_check; |
1360 | size_t trim_check; |
1452 | size_t magic; |
1361 | size_t magic; |
1453 | mchunkptr smallbins[(NSMALLBINS+1)*2]; |
1362 | mchunkptr smallbins[(NSMALLBINS+1)*2]; |
1454 | tbinptr treebins[NTREEBINS]; |
1363 | tbinptr treebins[NTREEBINS]; |
1455 | size_t footprint; |
1364 | size_t footprint; |
1456 | size_t max_footprint; |
1365 | size_t max_footprint; |
1457 | flag_t mflags; |
1366 | flag_t mflags; |
1458 | #if USE_LOCKS |
1367 | #if USE_LOCKS |
1459 | MLOCK_T mutex; /* locate lock among fields that rarely change */ |
1368 | MLOCK_T mutex; /* locate lock among fields that rarely change */ |
1460 | #endif /* USE_LOCKS */ |
1369 | #endif /* USE_LOCKS */ |
1461 | msegment seg; |
1370 | msegment seg; |
1462 | }; |
1371 | }; |
1463 | 1372 | ||
1464 | typedef struct malloc_state* mstate; |
1373 | typedef struct malloc_state* mstate; |
1465 | 1374 | ||
1466 | /* ------------- Global malloc_state and malloc_params ------------------- */ |
1375 | /* ------------- Global malloc_state and malloc_params ------------------- */ |
1467 | 1376 | ||
1468 | /* |
1377 | /* |
1469 | malloc_params holds global properties, including those that can be |
1378 | malloc_params holds global properties, including those that can be |
1470 | dynamically set using mallopt. There is a single instance, mparams, |
1379 | dynamically set using mallopt. There is a single instance, mparams, |
1471 | initialized in init_mparams. |
1380 | initialized in init_mparams. |
1472 | */ |
1381 | */ |
1473 | 1382 | ||
1474 | struct malloc_params { |
1383 | struct malloc_params { |
1475 | size_t magic; |
1384 | size_t magic; |
1476 | size_t page_size; |
1385 | size_t page_size; |
1477 | size_t granularity; |
1386 | size_t granularity; |
1478 | size_t mmap_threshold; |
1387 | size_t mmap_threshold; |
1479 | size_t trim_threshold; |
1388 | size_t trim_threshold; |
1480 | flag_t default_mflags; |
1389 | flag_t default_mflags; |
1481 | }; |
1390 | }; |
1482 | 1391 | ||
1483 | static struct malloc_params mparams; |
1392 | static struct malloc_params mparams; |
1484 | 1393 | ||
1485 | /* The global malloc_state used for all non-"mspace" calls */ |
1394 | /* The global malloc_state used for all non-"mspace" calls */ |
1486 | static struct malloc_state _gm_; |
1395 | static struct malloc_state _gm_; |
1487 | #define gm (&_gm_) |
1396 | #define gm (&_gm_) |
1488 | #define is_global(M) ((M) == &_gm_) |
1397 | #define is_global(M) ((M) == &_gm_) |
1489 | #define is_initialized(M) ((M)->top != 0) |
1398 | #define is_initialized(M) ((M)->top != 0) |
1490 | 1399 | ||
1491 | /* -------------------------- system alloc setup ------------------------- */ |
1400 | /* -------------------------- system alloc setup ------------------------- */ |
1492 | 1401 | ||
1493 | /* Operations on mflags */ |
1402 | /* Operations on mflags */ |
1494 | 1403 | ||
1495 | #define use_lock(M) ((M)->mflags & USE_LOCK_BIT) |
1404 | #define use_lock(M) ((M)->mflags & USE_LOCK_BIT) |
1496 | #define enable_lock(M) ((M)->mflags |= USE_LOCK_BIT) |
1405 | #define enable_lock(M) ((M)->mflags |= USE_LOCK_BIT) |
1497 | #define disable_lock(M) ((M)->mflags &= ~USE_LOCK_BIT) |
1406 | #define disable_lock(M) ((M)->mflags &= ~USE_LOCK_BIT) |
1498 | 1407 | ||
1499 | #define use_mmap(M) ((M)->mflags & USE_MMAP_BIT) |
1408 | #define use_mmap(M) ((M)->mflags & USE_MMAP_BIT) |
1500 | #define enable_mmap(M) ((M)->mflags |= USE_MMAP_BIT) |
1409 | #define enable_mmap(M) ((M)->mflags |= USE_MMAP_BIT) |
1501 | #define disable_mmap(M) ((M)->mflags &= ~USE_MMAP_BIT) |
1410 | #define disable_mmap(M) ((M)->mflags &= ~USE_MMAP_BIT) |
1502 | 1411 | ||
1503 | #define use_noncontiguous(M) ((M)->mflags & USE_NONCONTIGUOUS_BIT) |
1412 | #define use_noncontiguous(M) ((M)->mflags & USE_NONCONTIGUOUS_BIT) |
1504 | #define disable_contiguous(M) ((M)->mflags |= USE_NONCONTIGUOUS_BIT) |
1413 | #define disable_contiguous(M) ((M)->mflags |= USE_NONCONTIGUOUS_BIT) |
1505 | 1414 | ||
1506 | #define set_lock(M,L)\ |
1415 | #define set_lock(M,L)\ |
1507 | ((M)->mflags = (L)?\ |
1416 | ((M)->mflags = (L)?\ |
1508 | ((M)->mflags | USE_LOCK_BIT) :\ |
1417 | ((M)->mflags | USE_LOCK_BIT) :\ |
1509 | ((M)->mflags & ~USE_LOCK_BIT)) |
1418 | ((M)->mflags & ~USE_LOCK_BIT)) |
1510 | 1419 | ||
1511 | /* page-align a size */ |
1420 | /* page-align a size */ |
1512 | #define page_align(S)\ |
1421 | #define page_align(S)\ |
1513 | (((S) + (mparams.page_size)) & ~(mparams.page_size - SIZE_T_ONE)) |
1422 | (((S) + (mparams.page_size)) & ~(mparams.page_size - SIZE_T_ONE)) |
1514 | 1423 | ||
1515 | /* granularity-align a size */ |
1424 | /* granularity-align a size */ |
1516 | #define granularity_align(S)\ |
1425 | #define granularity_align(S)\ |
1517 | (((S) + (mparams.granularity)) & ~(mparams.granularity - SIZE_T_ONE)) |
1426 | (((S) + (mparams.granularity)) & ~(mparams.granularity - SIZE_T_ONE)) |
1518 | 1427 | ||
1519 | #define is_page_aligned(S)\ |
1428 | #define is_page_aligned(S)\ |
1520 | (((size_t)(S) & (mparams.page_size - SIZE_T_ONE)) == 0) |
1429 | (((size_t)(S) & (mparams.page_size - SIZE_T_ONE)) == 0) |
1521 | #define is_granularity_aligned(S)\ |
1430 | #define is_granularity_aligned(S)\ |
1522 | (((size_t)(S) & (mparams.granularity - SIZE_T_ONE)) == 0) |
1431 | (((size_t)(S) & (mparams.granularity - SIZE_T_ONE)) == 0) |
1523 | 1432 | ||
1524 | /* True if segment S holds address A */ |
1433 | /* True if segment S holds address A */ |
1525 | #define segment_holds(S, A)\ |
1434 | #define segment_holds(S, A)\ |
1526 | ((char*)(A) >= S->base && (char*)(A) < S->base + S->size) |
1435 | ((char*)(A) >= S->base && (char*)(A) < S->base + S->size) |
1527 | 1436 | ||
1528 | /* Return segment holding given address */ |
1437 | /* Return segment holding given address */ |
1529 | static msegmentptr segment_holding(mstate m, char* addr) { |
1438 | static msegmentptr segment_holding(mstate m, char* addr) { |
1530 | msegmentptr sp = &m->seg; |
1439 | msegmentptr sp = &m->seg; |
1531 | for (;;) { |
1440 | for (;;) { |
1532 | if (addr >= sp->base && addr < sp->base + sp->size) |
1441 | if (addr >= sp->base && addr < sp->base + sp->size) |
1533 | return sp; |
1442 | return sp; |
1534 | if ((sp = sp->next) == 0) |
1443 | if ((sp = sp->next) == 0) |
1535 | return 0; |
1444 | return 0; |
1536 | } |
1445 | } |
1537 | } |
1446 | } |
1538 | 1447 | ||
1539 | /* Return true if segment contains a segment link */ |
1448 | /* Return true if segment contains a segment link */ |
1540 | static int has_segment_link(mstate m, msegmentptr ss) { |
1449 | static int has_segment_link(mstate m, msegmentptr ss) { |
1541 | msegmentptr sp = &m->seg; |
1450 | msegmentptr sp = &m->seg; |
1542 | for (;;) { |
1451 | for (;;) { |
1543 | if ((char*)sp >= ss->base && (char*)sp < ss->base + ss->size) |
1452 | if ((char*)sp >= ss->base && (char*)sp < ss->base + ss->size) |
1544 | return 1; |
1453 | return 1; |
1545 | if ((sp = sp->next) == 0) |
1454 | if ((sp = sp->next) == 0) |
1546 | return 0; |
1455 | return 0; |
1547 | } |
1456 | } |
1548 | } |
1457 | } |
1549 | 1458 | ||
1550 | #ifndef MORECORE_CANNOT_TRIM |
1459 | #ifndef MORECORE_CANNOT_TRIM |
1551 | #define should_trim(M,s) ((s) > (M)->trim_check) |
1460 | #define should_trim(M,s) ((s) > (M)->trim_check) |
1552 | #else /* MORECORE_CANNOT_TRIM */ |
1461 | #else /* MORECORE_CANNOT_TRIM */ |
1553 | #define should_trim(M,s) (0) |
1462 | #define should_trim(M,s) (0) |
1554 | #endif /* MORECORE_CANNOT_TRIM */ |
1463 | #endif /* MORECORE_CANNOT_TRIM */ |
1555 | 1464 | ||
1556 | /* |
1465 | /* |
1557 | TOP_FOOT_SIZE is padding at the end of a segment, including space |
1466 | TOP_FOOT_SIZE is padding at the end of a segment, including space |
1558 | that may be needed to place segment records and fenceposts when new |
1467 | that may be needed to place segment records and fenceposts when new |
1559 | noncontiguous segments are added. |
1468 | noncontiguous segments are added. |
1560 | */ |
1469 | */ |
1561 | #define TOP_FOOT_SIZE\ |
1470 | #define TOP_FOOT_SIZE\ |
1562 | (align_offset(chunk2mem(0))+pad_request(sizeof(struct malloc_segment))+MIN_CHUNK_SIZE) |
1471 | (align_offset(chunk2mem(0))+pad_request(sizeof(struct malloc_segment))+MIN_CHUNK_SIZE) |
1563 | 1472 | ||
1564 | 1473 | ||
1565 | /* ------------------------------- Hooks -------------------------------- */ |
1474 | /* ------------------------------- Hooks -------------------------------- */ |
1566 | 1475 | ||
1567 | /* |
1476 | /* |
1568 | PREACTION should be defined to return 0 on success, and nonzero on |
1477 | PREACTION should be defined to return 0 on success, and nonzero on |
1569 | failure. If you are not using locking, you can redefine these to do |
1478 | failure. If you are not using locking, you can redefine these to do |
1570 | anything you like. |
1479 | anything you like. |
1571 | */ |
1480 | */ |
1572 | 1481 | ||
1573 | #if USE_LOCKS |
1482 | #if USE_LOCKS |
1574 | 1483 | ||
1575 | /* Ensure locks are initialized */ |
1484 | /* Ensure locks are initialized */ |
1576 | #define GLOBALLY_INITIALIZE() (mparams.page_size == 0 && init_mparams()) |
1485 | #define GLOBALLY_INITIALIZE() (mparams.page_size == 0 && init_mparams()) |
1577 | 1486 | ||
1578 | #define PREACTION(M) ((GLOBALLY_INITIALIZE() || use_lock(M))? ACQUIRE_LOCK(&(M)->mutex) : 0) |
1487 | #define PREACTION(M) ((GLOBALLY_INITIALIZE() || use_lock(M))? ACQUIRE_LOCK(&(M)->mutex) : 0) |
1579 | #define POSTACTION(M) { if (use_lock(M)) RELEASE_LOCK(&(M)->mutex); } |
1488 | #define POSTACTION(M) { if (use_lock(M)) RELEASE_LOCK(&(M)->mutex); } |
1580 | #else /* USE_LOCKS */ |
1489 | #else /* USE_LOCKS */ |
1581 | 1490 | ||
1582 | #ifndef PREACTION |
1491 | #ifndef PREACTION |
1583 | #define PREACTION(M) (0) |
1492 | #define PREACTION(M) (0) |
1584 | #endif /* PREACTION */ |
1493 | #endif /* PREACTION */ |
1585 | 1494 | ||
1586 | #ifndef POSTACTION |
1495 | #ifndef POSTACTION |
1587 | #define POSTACTION(M) |
1496 | #define POSTACTION(M) |
1588 | #endif /* POSTACTION */ |
1497 | #endif /* POSTACTION */ |
1589 | 1498 | ||
1590 | #endif /* USE_LOCKS */ |
1499 | #endif /* USE_LOCKS */ |
1591 | 1500 | ||
1592 | /* |
1501 | /* |
1593 | CORRUPTION_ERROR_ACTION is triggered upon detected bad addresses. |
1502 | CORRUPTION_ERROR_ACTION is triggered upon detected bad addresses. |
1594 | USAGE_ERROR_ACTION is triggered on detected bad frees and |
1503 | USAGE_ERROR_ACTION is triggered on detected bad frees and |
1595 | reallocs. The argument p is an address that might have triggered the |
1504 | reallocs. The argument p is an address that might have triggered the |
1596 | fault. It is ignored by the two predefined actions, but might be |
1505 | fault. It is ignored by the two predefined actions, but might be |
1597 | useful in custom actions that try to help diagnose errors. |
1506 | useful in custom actions that try to help diagnose errors. |
1598 | */ |
1507 | */ |
1599 | 1508 | ||
1600 | #if PROCEED_ON_ERROR |
1509 | #if PROCEED_ON_ERROR |
1601 | 1510 | ||
1602 | /* A count of the number of corruption errors causing resets */ |
1511 | /* A count of the number of corruption errors causing resets */ |
1603 | int malloc_corruption_error_count; |
1512 | int malloc_corruption_error_count; |
1604 | 1513 | ||
1605 | /* default corruption action */ |
1514 | /* default corruption action */ |
1606 | static void reset_on_error(mstate m); |
1515 | static void reset_on_error(mstate m); |
1607 | 1516 | ||
1608 | #define CORRUPTION_ERROR_ACTION(m) reset_on_error(m) |
1517 | #define CORRUPTION_ERROR_ACTION(m) reset_on_error(m) |
1609 | #define USAGE_ERROR_ACTION(m, p) |
1518 | #define USAGE_ERROR_ACTION(m, p) |
1610 | 1519 | ||
1611 | #else /* PROCEED_ON_ERROR */ |
1520 | #else /* PROCEED_ON_ERROR */ |
1612 | 1521 | ||
1613 | #ifndef CORRUPTION_ERROR_ACTION |
1522 | #ifndef CORRUPTION_ERROR_ACTION |
1614 | #define CORRUPTION_ERROR_ACTION(m) ABORT |
1523 | #define CORRUPTION_ERROR_ACTION(m) ABORT |
1615 | #endif /* CORRUPTION_ERROR_ACTION */ |
1524 | #endif /* CORRUPTION_ERROR_ACTION */ |
1616 | 1525 | ||
1617 | #ifndef USAGE_ERROR_ACTION |
1526 | #ifndef USAGE_ERROR_ACTION |
1618 | #define USAGE_ERROR_ACTION(m,p) ABORT |
1527 | #define USAGE_ERROR_ACTION(m,p) ABORT |
1619 | #endif /* USAGE_ERROR_ACTION */ |
1528 | #endif /* USAGE_ERROR_ACTION */ |
1620 | 1529 | ||
1621 | #endif /* PROCEED_ON_ERROR */ |
1530 | #endif /* PROCEED_ON_ERROR */ |
1622 | 1531 | ||
1623 | /* -------------------------- Debugging setup ---------------------------- */ |
1532 | /* -------------------------- Debugging setup ---------------------------- */ |
1624 | 1533 | ||
1625 | #if ! DEBUG |
1534 | #if ! DEBUG |
1626 | 1535 | ||
1627 | #define check_free_chunk(M,P) |
1536 | #define check_free_chunk(M,P) |
1628 | #define check_inuse_chunk(M,P) |
1537 | #define check_inuse_chunk(M,P) |
1629 | #define check_malloced_chunk(M,P,N) |
1538 | #define check_malloced_chunk(M,P,N) |
1630 | #define check_mmapped_chunk(M,P) |
1539 | #define check_mmapped_chunk(M,P) |
1631 | #define check_malloc_state(M) |
1540 | #define check_malloc_state(M) |
1632 | #define check_top_chunk(M,P) |
1541 | #define check_top_chunk(M,P) |
1633 | 1542 | ||
1634 | #else /* DEBUG */ |
1543 | #else /* DEBUG */ |
1635 | #define check_free_chunk(M,P) do_check_free_chunk(M,P) |
1544 | #define check_free_chunk(M,P) do_check_free_chunk(M,P) |
1636 | #define check_inuse_chunk(M,P) do_check_inuse_chunk(M,P) |
1545 | #define check_inuse_chunk(M,P) do_check_inuse_chunk(M,P) |
1637 | #define check_top_chunk(M,P) do_check_top_chunk(M,P) |
1546 | #define check_top_chunk(M,P) do_check_top_chunk(M,P) |
1638 | #define check_malloced_chunk(M,P,N) do_check_malloced_chunk(M,P,N) |
1547 | #define check_malloced_chunk(M,P,N) do_check_malloced_chunk(M,P,N) |
1639 | #define check_mmapped_chunk(M,P) do_check_mmapped_chunk(M,P) |
1548 | #define check_mmapped_chunk(M,P) do_check_mmapped_chunk(M,P) |
1640 | #define check_malloc_state(M) do_check_malloc_state(M) |
1549 | #define check_malloc_state(M) do_check_malloc_state(M) |
1641 | 1550 | ||
1642 | static void do_check_any_chunk(mstate m, mchunkptr p); |
1551 | static void do_check_any_chunk(mstate m, mchunkptr p); |
1643 | static void do_check_top_chunk(mstate m, mchunkptr p); |
1552 | static void do_check_top_chunk(mstate m, mchunkptr p); |
1644 | static void do_check_mmapped_chunk(mstate m, mchunkptr p); |
1553 | static void do_check_mmapped_chunk(mstate m, mchunkptr p); |
1645 | static void do_check_inuse_chunk(mstate m, mchunkptr p); |
1554 | static void do_check_inuse_chunk(mstate m, mchunkptr p); |
1646 | static void do_check_free_chunk(mstate m, mchunkptr p); |
1555 | static void do_check_free_chunk(mstate m, mchunkptr p); |
1647 | static void do_check_malloced_chunk(mstate m, void* mem, size_t s); |
1556 | static void do_check_malloced_chunk(mstate m, void* mem, size_t s); |
1648 | static void do_check_tree(mstate m, tchunkptr t); |
1557 | static void do_check_tree(mstate m, tchunkptr t); |
1649 | static void do_check_treebin(mstate m, bindex_t i); |
1558 | static void do_check_treebin(mstate m, bindex_t i); |
1650 | static void do_check_smallbin(mstate m, bindex_t i); |
1559 | static void do_check_smallbin(mstate m, bindex_t i); |
1651 | static void do_check_malloc_state(mstate m); |
1560 | static void do_check_malloc_state(mstate m); |
1652 | static int bin_find(mstate m, mchunkptr x); |
1561 | static int bin_find(mstate m, mchunkptr x); |
1653 | static size_t traverse_and_check(mstate m); |
1562 | static size_t traverse_and_check(mstate m); |
1654 | #endif /* DEBUG */ |
1563 | #endif /* DEBUG */ |
1655 | 1564 | ||
1656 | /* ---------------------------- Indexing Bins ---------------------------- */ |
1565 | /* ---------------------------- Indexing Bins ---------------------------- */ |
1657 | 1566 | ||
1658 | #define is_small(s) (((s) >> SMALLBIN_SHIFT) < NSMALLBINS) |
1567 | #define is_small(s) (((s) >> SMALLBIN_SHIFT) < NSMALLBINS) |
1659 | #define small_index(s) ((s) >> SMALLBIN_SHIFT) |
1568 | #define small_index(s) ((s) >> SMALLBIN_SHIFT) |
1660 | #define small_index2size(i) ((i) << SMALLBIN_SHIFT) |
1569 | #define small_index2size(i) ((i) << SMALLBIN_SHIFT) |
1661 | #define MIN_SMALL_INDEX (small_index(MIN_CHUNK_SIZE)) |
1570 | #define MIN_SMALL_INDEX (small_index(MIN_CHUNK_SIZE)) |
1662 | 1571 | ||
1663 | /* addressing by index. See above about smallbin repositioning */ |
1572 | /* addressing by index. See above about smallbin repositioning */ |
1664 | #define smallbin_at(M, i) ((sbinptr)((char*)&((M)->smallbins[(i)<<1]))) |
1573 | #define smallbin_at(M, i) ((sbinptr)((char*)&((M)->smallbins[(i)<<1]))) |
1665 | #define treebin_at(M,i) (&((M)->treebins[i])) |
1574 | #define treebin_at(M,i) (&((M)->treebins[i])) |
1666 | 1575 | ||
1667 | /* assign tree index for size S to variable I */ |
1576 | /* assign tree index for size S to variable I */ |
1668 | #if defined(__GNUC__) && defined(i386) |
1577 | #if defined(__GNUC__) && defined(i386) |
1669 | #define compute_tree_index(S, I)\ |
1578 | #define compute_tree_index(S, I)\ |
1670 | {\ |
1579 | {\ |
1671 | size_t X = S >> TREEBIN_SHIFT;\ |
1580 | size_t X = S >> TREEBIN_SHIFT;\ |
1672 | if (X == 0)\ |
1581 | if (X == 0)\ |
1673 | I = 0;\ |
1582 | I = 0;\ |
1674 | else if (X > 0xFFFF)\ |
1583 | else if (X > 0xFFFF)\ |
1675 | I = NTREEBINS-1;\ |
1584 | I = NTREEBINS-1;\ |
1676 | else {\ |
1585 | else {\ |
1677 | unsigned int K;\ |
1586 | unsigned int K;\ |
1678 | __asm__("bsrl %1,%0\n\t" : "=r" (K) : "rm" (X));\ |
1587 | __asm__("bsrl %1,%0\n\t" : "=r" (K) : "rm" (X));\ |
1679 | I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\ |
1588 | I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\ |
1680 | }\ |
1589 | }\ |
1681 | } |
1590 | } |
1682 | #else /* GNUC */ |
1591 | #else /* GNUC */ |
1683 | #define compute_tree_index(S, I)\ |
1592 | #define compute_tree_index(S, I)\ |
1684 | {\ |
1593 | {\ |
1685 | size_t X = S >> TREEBIN_SHIFT;\ |
1594 | size_t X = S >> TREEBIN_SHIFT;\ |
1686 | if (X == 0)\ |
1595 | if (X == 0)\ |
1687 | I = 0;\ |
1596 | I = 0;\ |
1688 | else if (X > 0xFFFF)\ |
1597 | else if (X > 0xFFFF)\ |
1689 | I = NTREEBINS-1;\ |
1598 | I = NTREEBINS-1;\ |
1690 | else {\ |
1599 | else {\ |
1691 | unsigned int Y = (unsigned int)X;\ |
1600 | unsigned int Y = (unsigned int)X;\ |
1692 | unsigned int N = ((Y - 0x100) >> 16) & 8;\ |
1601 | unsigned int N = ((Y - 0x100) >> 16) & 8;\ |
1693 | unsigned int K = (((Y <<= N) - 0x1000) >> 16) & 4;\ |
1602 | unsigned int K = (((Y <<= N) - 0x1000) >> 16) & 4;\ |
1694 | N += K;\ |
1603 | N += K;\ |
1695 | N += K = (((Y <<= K) - 0x4000) >> 16) & 2;\ |
1604 | N += K = (((Y <<= K) - 0x4000) >> 16) & 2;\ |
1696 | K = 14 - N + ((Y <<= K) >> 15);\ |
1605 | K = 14 - N + ((Y <<= K) >> 15);\ |
1697 | I = (K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1));\ |
1606 | I = (K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1));\ |
1698 | }\ |
1607 | }\ |
1699 | } |
1608 | } |
1700 | #endif /* GNUC */ |
1609 | #endif /* GNUC */ |
1701 | 1610 | ||
1702 | /* Bit representing maximum resolved size in a treebin at i */ |
1611 | /* Bit representing maximum resolved size in a treebin at i */ |
1703 | #define bit_for_tree_index(i) \ |
1612 | #define bit_for_tree_index(i) \ |
1704 | (i == NTREEBINS-1)? (SIZE_T_BITSIZE-1) : (((i) >> 1) + TREEBIN_SHIFT - 2) |
1613 | (i == NTREEBINS-1)? (SIZE_T_BITSIZE-1) : (((i) >> 1) + TREEBIN_SHIFT - 2) |
1705 | 1614 | ||
1706 | /* Shift placing maximum resolved bit in a treebin at i as sign bit */ |
1615 | /* Shift placing maximum resolved bit in a treebin at i as sign bit */ |
1707 | #define leftshift_for_tree_index(i) \ |
1616 | #define leftshift_for_tree_index(i) \ |
1708 | ((i == NTREEBINS-1)? 0 : \ |
1617 | ((i == NTREEBINS-1)? 0 : \ |
1709 | ((SIZE_T_BITSIZE-SIZE_T_ONE) - (((i) >> 1) + TREEBIN_SHIFT - 2))) |
1618 | ((SIZE_T_BITSIZE-SIZE_T_ONE) - (((i) >> 1) + TREEBIN_SHIFT - 2))) |
1710 | 1619 | ||
1711 | /* The size of the smallest chunk held in bin with index i */ |
1620 | /* The size of the smallest chunk held in bin with index i */ |
1712 | #define minsize_for_tree_index(i) \ |
1621 | #define minsize_for_tree_index(i) \ |
1713 | ((SIZE_T_ONE << (((i) >> 1) + TREEBIN_SHIFT)) | \ |
1622 | ((SIZE_T_ONE << (((i) >> 1) + TREEBIN_SHIFT)) | \ |
1714 | (((size_t)((i) & SIZE_T_ONE)) << (((i) >> 1) + TREEBIN_SHIFT - 1))) |
1623 | (((size_t)((i) & SIZE_T_ONE)) << (((i) >> 1) + TREEBIN_SHIFT - 1))) |
1715 | 1624 | ||
1716 | 1625 | ||
1717 | /* ------------------------ Operations on bin maps ----------------------- */ |
1626 | /* ------------------------ Operations on bin maps ----------------------- */ |
1718 | 1627 | ||
1719 | /* bit corresponding to given index */ |
1628 | /* bit corresponding to given index */ |
1720 | #define idx2bit(i) ((binmap_t)(1) << (i)) |
1629 | #define idx2bit(i) ((binmap_t)(1) << (i)) |
1721 | 1630 | ||
1722 | /* Mark/Clear bits with given index */ |
1631 | /* Mark/Clear bits with given index */ |
1723 | #define mark_smallmap(M,i) ((M)->smallmap |= idx2bit(i)) |
1632 | #define mark_smallmap(M,i) ((M)->smallmap |= idx2bit(i)) |
1724 | #define clear_smallmap(M,i) ((M)->smallmap &= ~idx2bit(i)) |
1633 | #define clear_smallmap(M,i) ((M)->smallmap &= ~idx2bit(i)) |
1725 | #define smallmap_is_marked(M,i) ((M)->smallmap & idx2bit(i)) |
1634 | #define smallmap_is_marked(M,i) ((M)->smallmap & idx2bit(i)) |
1726 | 1635 | ||
1727 | #define mark_treemap(M,i) ((M)->treemap |= idx2bit(i)) |
1636 | #define mark_treemap(M,i) ((M)->treemap |= idx2bit(i)) |
1728 | #define clear_treemap(M,i) ((M)->treemap &= ~idx2bit(i)) |
1637 | #define clear_treemap(M,i) ((M)->treemap &= ~idx2bit(i)) |
1729 | #define treemap_is_marked(M,i) ((M)->treemap & idx2bit(i)) |
1638 | #define treemap_is_marked(M,i) ((M)->treemap & idx2bit(i)) |
1730 | 1639 | ||
1731 | /* index corresponding to given bit */ |
1640 | /* index corresponding to given bit */ |
1732 | 1641 | ||
1733 | #if defined(__GNUC__) && defined(i386) |
1642 | #if defined(__GNUC__) && defined(i386) |
1734 | #define compute_bit2idx(X, I)\ |
1643 | #define compute_bit2idx(X, I)\ |
1735 | {\ |
1644 | {\ |
1736 | unsigned int J;\ |
1645 | unsigned int J;\ |
1737 | __asm__("bsfl %1,%0\n\t" : "=r" (J) : "rm" (X));\ |
1646 | __asm__("bsfl %1,%0\n\t" : "=r" (J) : "rm" (X));\ |
1738 | I = (bindex_t)J;\ |
1647 | I = (bindex_t)J;\ |
1739 | } |
1648 | } |
1740 | 1649 | ||
1741 | #else /* GNUC */ |
1650 | #else /* GNUC */ |
1742 | #if USE_BUILTIN_FFS |
1651 | #if USE_BUILTIN_FFS |
1743 | #define compute_bit2idx(X, I) I = ffs(X)-1 |
1652 | #define compute_bit2idx(X, I) I = ffs(X)-1 |
1744 | 1653 | ||
1745 | #else /* USE_BUILTIN_FFS */ |
1654 | #else /* USE_BUILTIN_FFS */ |
1746 | #define compute_bit2idx(X, I)\ |
1655 | #define compute_bit2idx(X, I)\ |
1747 | {\ |
1656 | {\ |
1748 | unsigned int Y = X - 1;\ |
1657 | unsigned int Y = X - 1;\ |
1749 | unsigned int K = Y >> (16-4) & 16;\ |
1658 | unsigned int K = Y >> (16-4) & 16;\ |
1750 | unsigned int N = K; Y >>= K;\ |
1659 | unsigned int N = K; Y >>= K;\ |
1751 | N += K = Y >> (8-3) & 8; Y >>= K;\ |
1660 | N += K = Y >> (8-3) & 8; Y >>= K;\ |
1752 | N += K = Y >> (4-2) & 4; Y >>= K;\ |
1661 | N += K = Y >> (4-2) & 4; Y >>= K;\ |
1753 | N += K = Y >> (2-1) & 2; Y >>= K;\ |
1662 | N += K = Y >> (2-1) & 2; Y >>= K;\ |
1754 | N += K = Y >> (1-0) & 1; Y >>= K;\ |
1663 | N += K = Y >> (1-0) & 1; Y >>= K;\ |
1755 | I = (bindex_t)(N + Y);\ |
1664 | I = (bindex_t)(N + Y);\ |
1756 | } |
1665 | } |
1757 | #endif /* USE_BUILTIN_FFS */ |
1666 | #endif /* USE_BUILTIN_FFS */ |
1758 | #endif /* GNUC */ |
1667 | #endif /* GNUC */ |
1759 | 1668 | ||
1760 | /* isolate the least set bit of a bitmap */ |
1669 | /* isolate the least set bit of a bitmap */ |
1761 | #define least_bit(x) ((x) & -(x)) |
1670 | #define least_bit(x) ((x) & -(x)) |
1762 | 1671 | ||
1763 | /* mask with all bits to left of least bit of x on */ |
1672 | /* mask with all bits to left of least bit of x on */ |
1764 | #define left_bits(x) ((x<<1) | -(x<<1)) |
1673 | #define left_bits(x) ((x<<1) | -(x<<1)) |
1765 | 1674 | ||
1766 | /* mask with all bits to left of or equal to least bit of x on */ |
1675 | /* mask with all bits to left of or equal to least bit of x on */ |
1767 | #define same_or_left_bits(x) ((x) | -(x)) |
1676 | #define same_or_left_bits(x) ((x) | -(x)) |
1768 | 1677 | ||
1769 | 1678 | ||
1770 | /* ----------------------- Runtime Check Support ------------------------- */ |
1679 | /* ----------------------- Runtime Check Support ------------------------- */ |
1771 | 1680 | ||
1772 | /* |
1681 | /* |
1773 | For security, the main invariant is that malloc/free/etc never |
1682 | For security, the main invariant is that malloc/free/etc never |
1774 | writes to a static address other than malloc_state, unless static |
1683 | writes to a static address other than malloc_state, unless static |
1775 | malloc_state itself has been corrupted, which cannot occur via |
1684 | malloc_state itself has been corrupted, which cannot occur via |
1776 | malloc (because of these checks). In essence this means that we |
1685 | malloc (because of these checks). In essence this means that we |
1777 | believe all pointers, sizes, maps etc held in malloc_state, but |
1686 | believe all pointers, sizes, maps etc held in malloc_state, but |
1778 | check all of those linked or offsetted from other embedded data |
1687 | check all of those linked or offsetted from other embedded data |
1779 | structures. These checks are interspersed with main code in a way |
1688 | structures. These checks are interspersed with main code in a way |
1780 | that tends to minimize their run-time cost. |
1689 | that tends to minimize their run-time cost. |
1781 | 1690 | ||
1782 | When FOOTERS is defined, in addition to range checking, we also |
1691 | When FOOTERS is defined, in addition to range checking, we also |
1783 | verify footer fields of inuse chunks, which can be used guarantee |
1692 | verify footer fields of inuse chunks, which can be used guarantee |
1784 | that the mstate controlling malloc/free is intact. This is a |
1693 | that the mstate controlling malloc/free is intact. This is a |
1785 | streamlined version of the approach described by William Robertson |
1694 | streamlined version of the approach described by William Robertson |
1786 | et al in "Run-time Detection of Heap-based Overflows" LISA'03 |
1695 | et al in "Run-time Detection of Heap-based Overflows" LISA'03 |
1787 | http://www.usenix.org/events/lisa03/tech/robertson.html The footer |
1696 | http://www.usenix.org/events/lisa03/tech/robertson.html The footer |
1788 | of an inuse chunk holds the xor of its mstate and a random seed, |
1697 | of an inuse chunk holds the xor of its mstate and a random seed, |
1789 | that is checked upon calls to free() and realloc(). This is |
1698 | that is checked upon calls to free() and realloc(). This is |
1790 | (probablistically) unguessable from outside the program, but can be |
1699 | (probablistically) unguessable from outside the program, but can be |
1791 | computed by any code successfully malloc'ing any chunk, so does not |
1700 | computed by any code successfully malloc'ing any chunk, so does not |
1792 | itself provide protection against code that has already broken |
1701 | itself provide protection against code that has already broken |
1793 | security through some other means. Unlike Robertson et al, we |
1702 | security through some other means. Unlike Robertson et al, we |
1794 | always dynamically check addresses of all offset chunks (previous, |
1703 | always dynamically check addresses of all offset chunks (previous, |
1795 | next, etc). This turns out to be cheaper than relying on hashes. |
1704 | next, etc). This turns out to be cheaper than relying on hashes. |
1796 | */ |
1705 | */ |
1797 | 1706 | ||
1798 | #if !INSECURE |
1707 | #if !INSECURE |
1799 | /* Check if address a is at least as high as any from MORECORE or MMAP */ |
1708 | /* Check if address a is at least as high as any from MORECORE or MMAP */ |
1800 | #define ok_address(M, a) ((char*)(a) >= (M)->least_addr) |
1709 | #define ok_address(M, a) ((char*)(a) >= (M)->least_addr) |
1801 | /* Check if address of next chunk n is higher than base chunk p */ |
1710 | /* Check if address of next chunk n is higher than base chunk p */ |
1802 | #define ok_next(p, n) ((char*)(p) < (char*)(n)) |
1711 | #define ok_next(p, n) ((char*)(p) < (char*)(n)) |
1803 | /* Check if p has its cinuse bit on */ |
1712 | /* Check if p has its cinuse bit on */ |
1804 | #define ok_cinuse(p) cinuse(p) |
1713 | #define ok_cinuse(p) cinuse(p) |
1805 | /* Check if p has its pinuse bit on */ |
1714 | /* Check if p has its pinuse bit on */ |
1806 | #define ok_pinuse(p) pinuse(p) |
1715 | #define ok_pinuse(p) pinuse(p) |
1807 | 1716 | ||
1808 | #else /* !INSECURE */ |
1717 | #else /* !INSECURE */ |
1809 | #define ok_address(M, a) (1) |
1718 | #define ok_address(M, a) (1) |
1810 | #define ok_next(b, n) (1) |
1719 | #define ok_next(b, n) (1) |
1811 | #define ok_cinuse(p) (1) |
1720 | #define ok_cinuse(p) (1) |
1812 | #define ok_pinuse(p) (1) |
1721 | #define ok_pinuse(p) (1) |
1813 | #endif /* !INSECURE */ |
1722 | #endif /* !INSECURE */ |
1814 | 1723 | ||
1815 | #if (FOOTERS && !INSECURE) |
1724 | #if (FOOTERS && !INSECURE) |
1816 | /* Check if (alleged) mstate m has expected magic field */ |
1725 | /* Check if (alleged) mstate m has expected magic field */ |
1817 | #define ok_magic(M) ((M)->magic == mparams.magic) |
1726 | #define ok_magic(M) ((M)->magic == mparams.magic) |
1818 | #else /* (FOOTERS && !INSECURE) */ |
1727 | #else /* (FOOTERS && !INSECURE) */ |
1819 | #define ok_magic(M) (1) |
1728 | #define ok_magic(M) (1) |
1820 | #endif /* (FOOTERS && !INSECURE) */ |
1729 | #endif /* (FOOTERS && !INSECURE) */ |
1821 | 1730 | ||
1822 | 1731 | ||
1823 | /* In gcc, use __builtin_expect to minimize impact of checks */ |
1732 | /* In gcc, use __builtin_expect to minimize impact of checks */ |
1824 | #if !INSECURE |
1733 | #if !INSECURE |
1825 | #if defined(__GNUC__) && __GNUC__ >= 3 |
1734 | #if defined(__GNUC__) && __GNUC__ >= 3 |
1826 | #define RTCHECK(e) __builtin_expect(e, 1) |
1735 | #define RTCHECK(e) __builtin_expect(e, 1) |
1827 | #else /* GNUC */ |
1736 | #else /* GNUC */ |
1828 | #define RTCHECK(e) (e) |
1737 | #define RTCHECK(e) (e) |
1829 | #endif /* GNUC */ |
1738 | #endif /* GNUC */ |
1830 | #else /* !INSECURE */ |
1739 | #else /* !INSECURE */ |
1831 | #define RTCHECK(e) (1) |
1740 | #define RTCHECK(e) (1) |
1832 | #endif /* !INSECURE */ |
1741 | #endif /* !INSECURE */ |
1833 | 1742 | ||
1834 | /* macros to set up inuse chunks with or without footers */ |
1743 | /* macros to set up inuse chunks with or without footers */ |
1835 | 1744 | ||
1836 | #if !FOOTERS |
1745 | #if !FOOTERS |
1837 | 1746 | ||
1838 | #define mark_inuse_foot(M,p,s) |
1747 | #define mark_inuse_foot(M,p,s) |
1839 | 1748 | ||
1840 | /* Set cinuse bit and pinuse bit of next chunk */ |
1749 | /* Set cinuse bit and pinuse bit of next chunk */ |
1841 | #define set_inuse(M,p,s)\ |
1750 | #define set_inuse(M,p,s)\ |
1842 | ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\ |
1751 | ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\ |
1843 | ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT) |
1752 | ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT) |
1844 | 1753 | ||
1845 | /* Set cinuse and pinuse of this chunk and pinuse of next chunk */ |
1754 | /* Set cinuse and pinuse of this chunk and pinuse of next chunk */ |
1846 | #define set_inuse_and_pinuse(M,p,s)\ |
1755 | #define set_inuse_and_pinuse(M,p,s)\ |
1847 | ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\ |
1756 | ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\ |
1848 | ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT) |
1757 | ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT) |
1849 | 1758 | ||
1850 | /* Set size, cinuse and pinuse bit of this chunk */ |
1759 | /* Set size, cinuse and pinuse bit of this chunk */ |
1851 | #define set_size_and_pinuse_of_inuse_chunk(M, p, s)\ |
1760 | #define set_size_and_pinuse_of_inuse_chunk(M, p, s)\ |
1852 | ((p)->head = (s|PINUSE_BIT|CINUSE_BIT)) |
1761 | ((p)->head = (s|PINUSE_BIT|CINUSE_BIT)) |
1853 | 1762 | ||
1854 | #else /* FOOTERS */ |
1763 | #else /* FOOTERS */ |
1855 | 1764 | ||
1856 | /* Set foot of inuse chunk to be xor of mstate and seed */ |
1765 | /* Set foot of inuse chunk to be xor of mstate and seed */ |
1857 | #define mark_inuse_foot(M,p,s)\ |
1766 | #define mark_inuse_foot(M,p,s)\ |
1858 | (((mchunkptr)((char*)(p) + (s)))->prev_foot = ((size_t)(M) ^ mparams.magic)) |
1767 | (((mchunkptr)((char*)(p) + (s)))->prev_foot = ((size_t)(M) ^ mparams.magic)) |
1859 | 1768 | ||
1860 | #define get_mstate_for(p)\ |
1769 | #define get_mstate_for(p)\ |
1861 | ((mstate)(((mchunkptr)((char*)(p) +\ |
1770 | ((mstate)(((mchunkptr)((char*)(p) +\ |
1862 | (chunksize(p))))->prev_foot ^ mparams.magic)) |
1771 | (chunksize(p))))->prev_foot ^ mparams.magic)) |
1863 | 1772 | ||
1864 | #define set_inuse(M,p,s)\ |
1773 | #define set_inuse(M,p,s)\ |
1865 | ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\ |
1774 | ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\ |
1866 | (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT), \ |
1775 | (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT), \ |
1867 | mark_inuse_foot(M,p,s)) |
1776 | mark_inuse_foot(M,p,s)) |
1868 | 1777 | ||
1869 | #define set_inuse_and_pinuse(M,p,s)\ |
1778 | #define set_inuse_and_pinuse(M,p,s)\ |
1870 | ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\ |
1779 | ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\ |
1871 | (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT),\ |
1780 | (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT),\ |
1872 | mark_inuse_foot(M,p,s)) |
1781 | mark_inuse_foot(M,p,s)) |
1873 | 1782 | ||
1874 | #define set_size_and_pinuse_of_inuse_chunk(M, p, s)\ |
1783 | #define set_size_and_pinuse_of_inuse_chunk(M, p, s)\ |
1875 | ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\ |
1784 | ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\ |
1876 | mark_inuse_foot(M, p, s)) |
1785 | mark_inuse_foot(M, p, s)) |
1877 | 1786 | ||
1878 | #endif /* !FOOTERS */ |
1787 | #endif /* !FOOTERS */ |
1879 | 1788 | ||
1880 | /* ---------------------------- setting mparams -------------------------- */ |
1789 | /* ---------------------------- setting mparams -------------------------- */ |
1881 | 1790 | ||
1882 | /* Initialize mparams */ |
1791 | /* Initialize mparams */ |
1883 | static int init_mparams(void) { |
1792 | static int init_mparams(void) { |
1884 | if (mparams.page_size == 0) { |
1793 | if (mparams.page_size == 0) { |
1885 | size_t s; |
1794 | size_t s; |
1886 | 1795 | ||
1887 | mparams.mmap_threshold = DEFAULT_MMAP_THRESHOLD; |
1796 | mparams.mmap_threshold = DEFAULT_MMAP_THRESHOLD; |
1888 | mparams.trim_threshold = DEFAULT_TRIM_THRESHOLD; |
1797 | mparams.trim_threshold = DEFAULT_TRIM_THRESHOLD; |
1889 | #if MORECORE_CONTIGUOUS |
1798 | #if MORECORE_CONTIGUOUS |
1890 | mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT; |
1799 | mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT; |
1891 | #else /* MORECORE_CONTIGUOUS */ |
1800 | #else /* MORECORE_CONTIGUOUS */ |
1892 | mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT|USE_NONCONTIGUOUS_BIT; |
1801 | mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT|USE_NONCONTIGUOUS_BIT; |
1893 | #endif /* MORECORE_CONTIGUOUS */ |
1802 | #endif /* MORECORE_CONTIGUOUS */ |
1894 | 1803 | ||
1895 | #if (FOOTERS && !INSECURE) |
1804 | #if (FOOTERS && !INSECURE) |
1896 | { |
1805 | { |
1897 | #if USE_DEV_RANDOM |
1806 | #if USE_DEV_RANDOM |
1898 | int fd; |
1807 | int fd; |
1899 | unsigned char buf[sizeof(size_t)]; |
1808 | unsigned char buf[sizeof(size_t)]; |
1900 | /* Try to use /dev/urandom, else fall back on using time */ |
1809 | /* Try to use /dev/urandom, else fall back on using time */ |
1901 | if ((fd = open("/dev/urandom", O_RDONLY)) >= 0 && |
1810 | if ((fd = open("/dev/urandom", O_RDONLY)) >= 0 && |
1902 | read(fd, buf, sizeof(buf)) == sizeof(buf)) { |
1811 | read(fd, buf, sizeof(buf)) == sizeof(buf)) { |
1903 | s = *((size_t *) buf); |
1812 | s = *((size_t *) buf); |
1904 | close(fd); |
1813 | close(fd); |
1905 | } |
1814 | } |
1906 | else |
1815 | else |
1907 | #endif /* USE_DEV_RANDOM */ |
1816 | #endif /* USE_DEV_RANDOM */ |
1908 | s = (size_t)(time(0) ^ (size_t)0x55555555U); |
1817 | s = (size_t)(time(0) ^ (size_t)0x55555555U); |
1909 | 1818 | ||
1910 | s |= (size_t)8U; /* ensure nonzero */ |
1819 | s |= (size_t)8U; /* ensure nonzero */ |
1911 | s &= ~(size_t)7U; /* improve chances of fault for bad values */ |
1820 | s &= ~(size_t)7U; /* improve chances of fault for bad values */ |
1912 | 1821 | ||
1913 | } |
1822 | } |
1914 | #else /* (FOOTERS && !INSECURE) */ |
1823 | #else /* (FOOTERS && !INSECURE) */ |
1915 | s = (size_t)0x58585858U; |
1824 | s = (size_t)0x58585858U; |
1916 | #endif /* (FOOTERS && !INSECURE) */ |
1825 | #endif /* (FOOTERS && !INSECURE) */ |
1917 | ACQUIRE_MAGIC_INIT_LOCK(); |
1826 | ACQUIRE_MAGIC_INIT_LOCK(); |
1918 | if (mparams.magic == 0) { |
1827 | if (mparams.magic == 0) { |
1919 | mparams.magic = s; |
1828 | mparams.magic = s; |
1920 | /* Set up lock for main malloc area */ |
1829 | /* Set up lock for main malloc area */ |
1921 | INITIAL_LOCK(&gm->mutex); |
1830 | INITIAL_LOCK(&gm->mutex); |
1922 | gm->mflags = mparams.default_mflags; |
1831 | gm->mflags = mparams.default_mflags; |
1923 | } |
1832 | } |
1924 | RELEASE_MAGIC_INIT_LOCK(); |
1833 | RELEASE_MAGIC_INIT_LOCK(); |
1925 | 1834 | ||
1926 | #ifndef WIN32 |
1835 | #ifndef WIN32 |
1927 | mparams.page_size = malloc_getpagesize; |
1836 | mparams.page_size = malloc_getpagesize; |
1928 | mparams.granularity = ((DEFAULT_GRANULARITY != 0)? |
1837 | mparams.granularity = ((DEFAULT_GRANULARITY != 0)? |
1929 | DEFAULT_GRANULARITY : mparams.page_size); |
1838 | DEFAULT_GRANULARITY : mparams.page_size); |
1930 | #else /* WIN32 */ |
1839 | #else /* WIN32 */ |
1931 | { |
1840 | { |
1932 | SYSTEM_INFO system_info; |
1841 | SYSTEM_INFO system_info; |
1933 | GetSystemInfo(&system_info); |
1842 | GetSystemInfo(&system_info); |
1934 | mparams.page_size = system_info.dwPageSize; |
1843 | mparams.page_size = system_info.dwPageSize; |
1935 | mparams.granularity = system_info.dwAllocationGranularity; |
1844 | mparams.granularity = system_info.dwAllocationGranularity; |
1936 | } |
1845 | } |
1937 | #endif /* WIN32 */ |
1846 | #endif /* WIN32 */ |
1938 | 1847 | ||
1939 | /* Sanity-check configuration: |
1848 | /* Sanity-check configuration: |
1940 | size_t must be unsigned and as wide as pointer type. |
1849 | size_t must be unsigned and as wide as pointer type. |
1941 | ints must be at least 4 bytes. |
1850 | ints must be at least 4 bytes. |
1942 | alignment must be at least 8. |
1851 | alignment must be at least 8. |
1943 | Alignment, min chunk size, and page size must all be powers of 2. |
1852 | Alignment, min chunk size, and page size must all be powers of 2. |
1944 | */ |
1853 | */ |
1945 | if ((sizeof(size_t) != sizeof(char*)) || |
1854 | if ((sizeof(size_t) != sizeof(char*)) || |
1946 | (MAX_SIZE_T < MIN_CHUNK_SIZE) || |
1855 | (MAX_SIZE_T < MIN_CHUNK_SIZE) || |
1947 | (sizeof(int) < 4) || |
1856 | (sizeof(int) < 4) || |
1948 | (MALLOC_ALIGNMENT < (size_t)8U) || |
1857 | (MALLOC_ALIGNMENT < (size_t)8U) || |
1949 | ((MALLOC_ALIGNMENT & (MALLOC_ALIGNMENT-SIZE_T_ONE)) != 0) || |
1858 | ((MALLOC_ALIGNMENT & (MALLOC_ALIGNMENT-SIZE_T_ONE)) != 0) || |
1950 | ((MCHUNK_SIZE & (MCHUNK_SIZE-SIZE_T_ONE)) != 0) || |
1859 | ((MCHUNK_SIZE & (MCHUNK_SIZE-SIZE_T_ONE)) != 0) || |
1951 | ((mparams.granularity & (mparams.granularity-SIZE_T_ONE)) != 0) || |
1860 | ((mparams.granularity & (mparams.granularity-SIZE_T_ONE)) != 0) || |
1952 | ((mparams.page_size & (mparams.page_size-SIZE_T_ONE)) != 0)) |
1861 | ((mparams.page_size & (mparams.page_size-SIZE_T_ONE)) != 0)) |
1953 | ABORT; |
1862 | ABORT; |
1954 | } |
1863 | } |
1955 | return 0; |
1864 | return 0; |
1956 | } |
1865 | } |
1957 | 1866 | ||
1958 | /* support for mallopt */ |
1867 | /* support for mallopt */ |
1959 | static int change_mparam(int param_number, int value) { |
1868 | static int change_mparam(int param_number, int value) { |
1960 | size_t val = (size_t)value; |
1869 | size_t val = (size_t)value; |
1961 | init_mparams(); |
1870 | init_mparams(); |
1962 | switch(param_number) { |
1871 | switch(param_number) { |
1963 | case M_TRIM_THRESHOLD: |
1872 | case M_TRIM_THRESHOLD: |
1964 | mparams.trim_threshold = val; |
1873 | mparams.trim_threshold = val; |
1965 | return 1; |
1874 | return 1; |
1966 | case M_GRANULARITY: |
1875 | case M_GRANULARITY: |
1967 | if (val >= mparams.page_size && ((val & (val-1)) == 0)) { |
1876 | if (val >= mparams.page_size && ((val & (val-1)) == 0)) { |
1968 | mparams.granularity = val; |
1877 | mparams.granularity = val; |
1969 | return 1; |
1878 | return 1; |
1970 | } |
1879 | } |
1971 | else |
1880 | else |
1972 | return 0; |
1881 | return 0; |
1973 | case M_MMAP_THRESHOLD: |
1882 | case M_MMAP_THRESHOLD: |
1974 | mparams.mmap_threshold = val; |
1883 | mparams.mmap_threshold = val; |
1975 | return 1; |
1884 | return 1; |
1976 | default: |
1885 | default: |
1977 | return 0; |
1886 | return 0; |
1978 | } |
1887 | } |
1979 | } |
1888 | } |
1980 | 1889 | ||
1981 | #if DEBUG |
1890 | #if DEBUG |
1982 | /* ------------------------- Debugging Support --------------------------- */ |
1891 | /* ------------------------- Debugging Support --------------------------- */ |
1983 | 1892 | ||
1984 | /* Check properties of any chunk, whether free, inuse, mmapped etc */ |
1893 | /* Check properties of any chunk, whether free, inuse, mmapped etc */ |
1985 | static void do_check_any_chunk(mstate m, mchunkptr p) { |
1894 | static void do_check_any_chunk(mstate m, mchunkptr p) { |
1986 | assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD)); |
1895 | assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD)); |
1987 | assert(ok_address(m, p)); |
1896 | assert(ok_address(m, p)); |
1988 | } |
1897 | } |
1989 | 1898 | ||
1990 | /* Check properties of top chunk */ |
1899 | /* Check properties of top chunk */ |
1991 | static void do_check_top_chunk(mstate m, mchunkptr p) { |
1900 | static void do_check_top_chunk(mstate m, mchunkptr p) { |
1992 | msegmentptr sp = segment_holding(m, (char*)p); |
1901 | msegmentptr sp = segment_holding(m, (char*)p); |
1993 | size_t sz = chunksize(p); |
1902 | size_t sz = chunksize(p); |
1994 | assert(sp != 0); |
1903 | assert(sp != 0); |
1995 | assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD)); |
1904 | assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD)); |
1996 | assert(ok_address(m, p)); |
1905 | assert(ok_address(m, p)); |
1997 | assert(sz == m->topsize); |
1906 | assert(sz == m->topsize); |
1998 | assert(sz > 0); |
1907 | assert(sz > 0); |
1999 | assert(sz == ((sp->base + sp->size) - (char*)p) - TOP_FOOT_SIZE); |
1908 | assert(sz == ((sp->base + sp->size) - (char*)p) - TOP_FOOT_SIZE); |
2000 | assert(pinuse(p)); |
1909 | assert(pinuse(p)); |
2001 | assert(!next_pinuse(p)); |
1910 | assert(!next_pinuse(p)); |
2002 | } |
1911 | } |
2003 | 1912 | ||
2004 | /* Check properties of (inuse) mmapped chunks */ |
1913 | /* Check properties of (inuse) mmapped chunks */ |
2005 | static void do_check_mmapped_chunk(mstate m, mchunkptr p) { |
1914 | static void do_check_mmapped_chunk(mstate m, mchunkptr p) { |
2006 | size_t sz = chunksize(p); |
1915 | size_t sz = chunksize(p); |
2007 | size_t len = (sz + (p->prev_foot & ~IS_MMAPPED_BIT) + MMAP_FOOT_PAD); |
1916 | size_t len = (sz + (p->prev_foot & ~IS_MMAPPED_BIT) + MMAP_FOOT_PAD); |
2008 | assert(is_mmapped(p)); |
1917 | assert(is_mmapped(p)); |
2009 | assert(use_mmap(m)); |
1918 | assert(use_mmap(m)); |
2010 | assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD)); |
1919 | assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD)); |
2011 | assert(ok_address(m, p)); |
1920 | assert(ok_address(m, p)); |
2012 | assert(!is_small(sz)); |
1921 | assert(!is_small(sz)); |
2013 | assert((len & (mparams.page_size-SIZE_T_ONE)) == 0); |
1922 | assert((len & (mparams.page_size-SIZE_T_ONE)) == 0); |
2014 | assert(chunk_plus_offset(p, sz)->head == FENCEPOST_HEAD); |
1923 | assert(chunk_plus_offset(p, sz)->head == FENCEPOST_HEAD); |
2015 | assert(chunk_plus_offset(p, sz+SIZE_T_SIZE)->head == 0); |
1924 | assert(chunk_plus_offset(p, sz+SIZE_T_SIZE)->head == 0); |
2016 | } |
1925 | } |
2017 | 1926 | ||
2018 | /* Check properties of inuse chunks */ |
1927 | /* Check properties of inuse chunks */ |
2019 | static void do_check_inuse_chunk(mstate m, mchunkptr p) { |
1928 | static void do_check_inuse_chunk(mstate m, mchunkptr p) { |
2020 | do_check_any_chunk(m, p); |
1929 | do_check_any_chunk(m, p); |
2021 | assert(cinuse(p)); |
1930 | assert(cinuse(p)); |
2022 | assert(next_pinuse(p)); |
1931 | assert(next_pinuse(p)); |
2023 | /* If not pinuse and not mmapped, previous chunk has OK offset */ |
1932 | /* If not pinuse and not mmapped, previous chunk has OK offset */ |
2024 | assert(is_mmapped(p) || pinuse(p) || next_chunk(prev_chunk(p)) == p); |
1933 | assert(is_mmapped(p) || pinuse(p) || next_chunk(prev_chunk(p)) == p); |
2025 | if (is_mmapped(p)) |
1934 | if (is_mmapped(p)) |
2026 | do_check_mmapped_chunk(m, p); |
1935 | do_check_mmapped_chunk(m, p); |
2027 | } |
1936 | } |
2028 | 1937 | ||
2029 | /* Check properties of free chunks */ |
1938 | /* Check properties of free chunks */ |
2030 | static void do_check_free_chunk(mstate m, mchunkptr p) { |
1939 | static void do_check_free_chunk(mstate m, mchunkptr p) { |
2031 | size_t sz = p->head & ~(PINUSE_BIT|CINUSE_BIT); |
1940 | size_t sz = p->head & ~(PINUSE_BIT|CINUSE_BIT); |
2032 | mchunkptr next = chunk_plus_offset(p, sz); |
1941 | mchunkptr next = chunk_plus_offset(p, sz); |
2033 | do_check_any_chunk(m, p); |
1942 | do_check_any_chunk(m, p); |
2034 | assert(!cinuse(p)); |
1943 | assert(!cinuse(p)); |
2035 | assert(!next_pinuse(p)); |
1944 | assert(!next_pinuse(p)); |
2036 | assert (!is_mmapped(p)); |
1945 | assert (!is_mmapped(p)); |
2037 | if (p != m->dv && p != m->top) { |
1946 | if (p != m->dv && p != m->top) { |
2038 | if (sz >= MIN_CHUNK_SIZE) { |
1947 | if (sz >= MIN_CHUNK_SIZE) { |
2039 | assert((sz & CHUNK_ALIGN_MASK) == 0); |
1948 | assert((sz & CHUNK_ALIGN_MASK) == 0); |
2040 | assert(is_aligned(chunk2mem(p))); |
1949 | assert(is_aligned(chunk2mem(p))); |
2041 | assert(next->prev_foot == sz); |
1950 | assert(next->prev_foot == sz); |
2042 | assert(pinuse(p)); |
1951 | assert(pinuse(p)); |
2043 | assert (next == m->top || cinuse(next)); |
1952 | assert (next == m->top || cinuse(next)); |
2044 | assert(p->fd->bk == p); |
1953 | assert(p->fd->bk == p); |
2045 | assert(p->bk->fd == p); |
1954 | assert(p->bk->fd == p); |
2046 | } |
1955 | } |
2047 | else /* markers are always of size SIZE_T_SIZE */ |
1956 | else /* markers are always of size SIZE_T_SIZE */ |
2048 | assert(sz == SIZE_T_SIZE); |
1957 | assert(sz == SIZE_T_SIZE); |
2049 | } |
1958 | } |
2050 | } |
1959 | } |
2051 | 1960 | ||
2052 | /* Check properties of malloced chunks at the point they are malloced */ |
1961 | /* Check properties of malloced chunks at the point they are malloced */ |
2053 | static void do_check_malloced_chunk(mstate m, void* mem, size_t s) { |
1962 | static void do_check_malloced_chunk(mstate m, void* mem, size_t s) { |
2054 | if (mem != 0) { |
1963 | if (mem != 0) { |
2055 | mchunkptr p = mem2chunk(mem); |
1964 | mchunkptr p = mem2chunk(mem); |
2056 | size_t sz = p->head & ~(PINUSE_BIT|CINUSE_BIT); |
1965 | size_t sz = p->head & ~(PINUSE_BIT|CINUSE_BIT); |
2057 | do_check_inuse_chunk(m, p); |
1966 | do_check_inuse_chunk(m, p); |
2058 | assert((sz & CHUNK_ALIGN_MASK) == 0); |
1967 | assert((sz & CHUNK_ALIGN_MASK) == 0); |
2059 | assert(sz >= MIN_CHUNK_SIZE); |
1968 | assert(sz >= MIN_CHUNK_SIZE); |
2060 | assert(sz >= s); |
1969 | assert(sz >= s); |
2061 | /* unless mmapped, size is less than MIN_CHUNK_SIZE more than request */ |
1970 | /* unless mmapped, size is less than MIN_CHUNK_SIZE more than request */ |
2062 | assert(is_mmapped(p) || sz < (s + MIN_CHUNK_SIZE)); |
1971 | assert(is_mmapped(p) || sz < (s + MIN_CHUNK_SIZE)); |
2063 | } |
1972 | } |
2064 | } |
1973 | } |
2065 | 1974 | ||
2066 | /* Check a tree and its subtrees. */ |
1975 | /* Check a tree and its subtrees. */ |
2067 | static void do_check_tree(mstate m, tchunkptr t) { |
1976 | static void do_check_tree(mstate m, tchunkptr t) { |
2068 | tchunkptr head = 0; |
1977 | tchunkptr head = 0; |
2069 | tchunkptr u = t; |
1978 | tchunkptr u = t; |
2070 | bindex_t tindex = t->index; |
1979 | bindex_t tindex = t->index; |
2071 | size_t tsize = chunksize(t); |
1980 | size_t tsize = chunksize(t); |
2072 | bindex_t idx; |
1981 | bindex_t idx; |
2073 | compute_tree_index(tsize, idx); |
1982 | compute_tree_index(tsize, idx); |
2074 | assert(tindex == idx); |
1983 | assert(tindex == idx); |
2075 | assert(tsize >= MIN_LARGE_SIZE); |
1984 | assert(tsize >= MIN_LARGE_SIZE); |
2076 | assert(tsize >= minsize_for_tree_index(idx)); |
1985 | assert(tsize >= minsize_for_tree_index(idx)); |
2077 | assert((idx == NTREEBINS-1) || (tsize < minsize_for_tree_index((idx+1)))); |
1986 | assert((idx == NTREEBINS-1) || (tsize < minsize_for_tree_index((idx+1)))); |
2078 | 1987 | ||
2079 | do { /* traverse through chain of same-sized nodes */ |
1988 | do { /* traverse through chain of same-sized nodes */ |
2080 | do_check_any_chunk(m, ((mchunkptr)u)); |
1989 | do_check_any_chunk(m, ((mchunkptr)u)); |
2081 | assert(u->index == tindex); |
1990 | assert(u->index == tindex); |
2082 | assert(chunksize(u) == tsize); |
1991 | assert(chunksize(u) == tsize); |
2083 | assert(!cinuse(u)); |
1992 | assert(!cinuse(u)); |
2084 | assert(!next_pinuse(u)); |
1993 | assert(!next_pinuse(u)); |
2085 | assert(u->fd->bk == u); |
1994 | assert(u->fd->bk == u); |
2086 | assert(u->bk->fd == u); |
1995 | assert(u->bk->fd == u); |
2087 | if (u->parent == 0) { |
1996 | if (u->parent == 0) { |
2088 | assert(u->child[0] == 0); |
1997 | assert(u->child[0] == 0); |
2089 | assert(u->child[1] == 0); |
1998 | assert(u->child[1] == 0); |
2090 | } |
1999 | } |
2091 | else { |
2000 | else { |
2092 | assert(head == 0); /* only one node on chain has parent */ |
2001 | assert(head == 0); /* only one node on chain has parent */ |
2093 | head = u; |
2002 | head = u; |
2094 | assert(u->parent != u); |
2003 | assert(u->parent != u); |
2095 | assert (u->parent->child[0] == u || |
2004 | assert (u->parent->child[0] == u || |
2096 | u->parent->child[1] == u || |
2005 | u->parent->child[1] == u || |
2097 | *((tbinptr*)(u->parent)) == u); |
2006 | *((tbinptr*)(u->parent)) == u); |
2098 | if (u->child[0] != 0) { |
2007 | if (u->child[0] != 0) { |
2099 | assert(u->child[0]->parent == u); |
2008 | assert(u->child[0]->parent == u); |
2100 | assert(u->child[0] != u); |
2009 | assert(u->child[0] != u); |
2101 | do_check_tree(m, u->child[0]); |
2010 | do_check_tree(m, u->child[0]); |
2102 | } |
2011 | } |
2103 | if (u->child[1] != 0) { |
2012 | if (u->child[1] != 0) { |
2104 | assert(u->child[1]->parent == u); |
2013 | assert(u->child[1]->parent == u); |
2105 | assert(u->child[1] != u); |
2014 | assert(u->child[1] != u); |
2106 | do_check_tree(m, u->child[1]); |
2015 | do_check_tree(m, u->child[1]); |
2107 | } |
2016 | } |
2108 | if (u->child[0] != 0 && u->child[1] != 0) { |
2017 | if (u->child[0] != 0 && u->child[1] != 0) { |
2109 | assert(chunksize(u->child[0]) < chunksize(u->child[1])); |
2018 | assert(chunksize(u->child[0]) < chunksize(u->child[1])); |
2110 | } |
2019 | } |
2111 | } |
2020 | } |
2112 | u = u->fd; |
2021 | u = u->fd; |
2113 | } while (u != t); |
2022 | } while (u != t); |
2114 | assert(head != 0); |
2023 | assert(head != 0); |
2115 | } |
2024 | } |
2116 | 2025 | ||
2117 | /* Check all the chunks in a treebin. */ |
2026 | /* Check all the chunks in a treebin. */ |
2118 | static void do_check_treebin(mstate m, bindex_t i) { |
2027 | static void do_check_treebin(mstate m, bindex_t i) { |
2119 | tbinptr* tb = treebin_at(m, i); |
2028 | tbinptr* tb = treebin_at(m, i); |
2120 | tchunkptr t = *tb; |
2029 | tchunkptr t = *tb; |
2121 | int empty = (m->treemap & (1U << i)) == 0; |
2030 | int empty = (m->treemap & (1U << i)) == 0; |
2122 | if (t == 0) |
2031 | if (t == 0) |
2123 | assert(empty); |
2032 | assert(empty); |
2124 | if (!empty) |
2033 | if (!empty) |
2125 | do_check_tree(m, t); |
2034 | do_check_tree(m, t); |
2126 | } |
2035 | } |
2127 | 2036 | ||
2128 | /* Check all the chunks in a smallbin. */ |
2037 | /* Check all the chunks in a smallbin. */ |
2129 | static void do_check_smallbin(mstate m, bindex_t i) { |
2038 | static void do_check_smallbin(mstate m, bindex_t i) { |
2130 | sbinptr b = smallbin_at(m, i); |
2039 | sbinptr b = smallbin_at(m, i); |
2131 | mchunkptr p = b->bk; |
2040 | mchunkptr p = b->bk; |
2132 | unsigned int empty = (m->smallmap & (1U << i)) == 0; |
2041 | unsigned int empty = (m->smallmap & (1U << i)) == 0; |
2133 | if (p == b) |
2042 | if (p == b) |
2134 | assert(empty); |
2043 | assert(empty); |
2135 | if (!empty) { |
2044 | if (!empty) { |
2136 | for (; p != b; p = p->bk) { |
2045 | for (; p != b; p = p->bk) { |
2137 | size_t size = chunksize(p); |
2046 | size_t size = chunksize(p); |
2138 | mchunkptr q; |
2047 | mchunkptr q; |
2139 | /* each chunk claims to be free */ |
2048 | /* each chunk claims to be free */ |
2140 | do_check_free_chunk(m, p); |
2049 | do_check_free_chunk(m, p); |
2141 | /* chunk belongs in bin */ |
2050 | /* chunk belongs in bin */ |
2142 | assert(small_index(size) == i); |
2051 | assert(small_index(size) == i); |
2143 | assert(p->bk == b || chunksize(p->bk) == chunksize(p)); |
2052 | assert(p->bk == b || chunksize(p->bk) == chunksize(p)); |
2144 | /* chunk is followed by an inuse chunk */ |
2053 | /* chunk is followed by an inuse chunk */ |
2145 | q = next_chunk(p); |
2054 | q = next_chunk(p); |
2146 | if (q->head != FENCEPOST_HEAD) |
2055 | if (q->head != FENCEPOST_HEAD) |
2147 | do_check_inuse_chunk(m, q); |
2056 | do_check_inuse_chunk(m, q); |
2148 | } |
2057 | } |
2149 | } |
2058 | } |
2150 | } |
2059 | } |
2151 | 2060 | ||
2152 | /* Find x in a bin. Used in other check functions. */ |
2061 | /* Find x in a bin. Used in other check functions. */ |
2153 | static int bin_find(mstate m, mchunkptr x) { |
2062 | static int bin_find(mstate m, mchunkptr x) { |
2154 | size_t size = chunksize(x); |
2063 | size_t size = chunksize(x); |
2155 | if (is_small(size)) { |
2064 | if (is_small(size)) { |
2156 | bindex_t sidx = small_index(size); |
2065 | bindex_t sidx = small_index(size); |
2157 | sbinptr b = smallbin_at(m, sidx); |
2066 | sbinptr b = smallbin_at(m, sidx); |
2158 | if (smallmap_is_marked(m, sidx)) { |
2067 | if (smallmap_is_marked(m, sidx)) { |
2159 | mchunkptr p = b; |
2068 | mchunkptr p = b; |
2160 | do { |
2069 | do { |
2161 | if (p == x) |
2070 | if (p == x) |
2162 | return 1; |
2071 | return 1; |
2163 | } while ((p = p->fd) != b); |
2072 | } while ((p = p->fd) != b); |
2164 | } |
2073 | } |
2165 | } |
2074 | } |
2166 | else { |
2075 | else { |
2167 | bindex_t tidx; |
2076 | bindex_t tidx; |
2168 | compute_tree_index(size, tidx); |
2077 | compute_tree_index(size, tidx); |
2169 | if (treemap_is_marked(m, tidx)) { |
2078 | if (treemap_is_marked(m, tidx)) { |
2170 | tchunkptr t = *treebin_at(m, tidx); |
2079 | tchunkptr t = *treebin_at(m, tidx); |
2171 | size_t sizebits = size << leftshift_for_tree_index(tidx); |
2080 | size_t sizebits = size << leftshift_for_tree_index(tidx); |
2172 | while (t != 0 && chunksize(t) != size) { |
2081 | while (t != 0 && chunksize(t) != size) { |
2173 | t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]; |
2082 | t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]; |
2174 | sizebits <<= 1; |
2083 | sizebits <<= 1; |
2175 | } |
2084 | } |
2176 | if (t != 0) { |
2085 | if (t != 0) { |
2177 | tchunkptr u = t; |
2086 | tchunkptr u = t; |
2178 | do { |
2087 | do { |
2179 | if (u == (tchunkptr)x) |
2088 | if (u == (tchunkptr)x) |
2180 | return 1; |
2089 | return 1; |
2181 | } while ((u = u->fd) != t); |
2090 | } while ((u = u->fd) != t); |
2182 | } |
2091 | } |
2183 | } |
2092 | } |
2184 | } |
2093 | } |
2185 | return 0; |
2094 | return 0; |
2186 | } |
2095 | } |
2187 | 2096 | ||
2188 | /* Traverse each chunk and check it; return total */ |
2097 | /* Traverse each chunk and check it; return total */ |
2189 | static size_t traverse_and_check(mstate m) { |
2098 | static size_t traverse_and_check(mstate m) { |
2190 | size_t sum = 0; |
2099 | size_t sum = 0; |
2191 | if (is_initialized(m)) { |
2100 | if (is_initialized(m)) { |
2192 | msegmentptr s = &m->seg; |
2101 | msegmentptr s = &m->seg; |
2193 | sum += m->topsize + TOP_FOOT_SIZE; |
2102 | sum += m->topsize + TOP_FOOT_SIZE; |
2194 | while (s != 0) { |
2103 | while (s != 0) { |
2195 | mchunkptr q = align_as_chunk(s->base); |
2104 | mchunkptr q = align_as_chunk(s->base); |
2196 | mchunkptr lastq = 0; |
2105 | mchunkptr lastq = 0; |
2197 | assert(pinuse(q)); |
2106 | assert(pinuse(q)); |
2198 | while (segment_holds(s, q) && |
2107 | while (segment_holds(s, q) && |
2199 | q != m->top && q->head != FENCEPOST_HEAD) { |
2108 | q != m->top && q->head != FENCEPOST_HEAD) { |
2200 | sum += chunksize(q); |
2109 | sum += chunksize(q); |
2201 | if (cinuse(q)) { |
2110 | if (cinuse(q)) { |
2202 | assert(!bin_find(m, q)); |
2111 | assert(!bin_find(m, q)); |
2203 | do_check_inuse_chunk(m, q); |
2112 | do_check_inuse_chunk(m, q); |
2204 | } |
2113 | } |
2205 | else { |
2114 | else { |
2206 | assert(q == m->dv || bin_find(m, q)); |
2115 | assert(q == m->dv || bin_find(m, q)); |
2207 | assert(lastq == 0 || cinuse(lastq)); /* Not 2 consecutive free */ |
2116 | assert(lastq == 0 || cinuse(lastq)); /* Not 2 consecutive free */ |
2208 | do_check_free_chunk(m, q); |
2117 | do_check_free_chunk(m, q); |
2209 | } |
2118 | } |
2210 | lastq = q; |
2119 | lastq = q; |
2211 | q = next_chunk(q); |
2120 | q = next_chunk(q); |
2212 | } |
2121 | } |
2213 | s = s->next; |
2122 | s = s->next; |
2214 | } |
2123 | } |
2215 | } |
2124 | } |
2216 | return sum; |
2125 | return sum; |
2217 | } |
2126 | } |
2218 | 2127 | ||
2219 | /* Check all properties of malloc_state. */ |
2128 | /* Check all properties of malloc_state. */ |
2220 | static void do_check_malloc_state(mstate m) { |
2129 | static void do_check_malloc_state(mstate m) { |
2221 | bindex_t i; |
2130 | bindex_t i; |
2222 | size_t total; |
2131 | size_t total; |
2223 | /* check bins */ |
2132 | /* check bins */ |
2224 | for (i = 0; i < NSMALLBINS; ++i) |
2133 | for (i = 0; i < NSMALLBINS; ++i) |
2225 | do_check_smallbin(m, i); |
2134 | do_check_smallbin(m, i); |
2226 | for (i = 0; i < NTREEBINS; ++i) |
2135 | for (i = 0; i < NTREEBINS; ++i) |
2227 | do_check_treebin(m, i); |
2136 | do_check_treebin(m, i); |
2228 | 2137 | ||
2229 | if (m->dvsize != 0) { /* check dv chunk */ |
2138 | if (m->dvsize != 0) { /* check dv chunk */ |
2230 | do_check_any_chunk(m, m->dv); |
2139 | do_check_any_chunk(m, m->dv); |
2231 | assert(m->dvsize == chunksize(m->dv)); |
2140 | assert(m->dvsize == chunksize(m->dv)); |
2232 | assert(m->dvsize >= MIN_CHUNK_SIZE); |
2141 | assert(m->dvsize >= MIN_CHUNK_SIZE); |
2233 | assert(bin_find(m, m->dv) == 0); |
2142 | assert(bin_find(m, m->dv) == 0); |
2234 | } |
2143 | } |
2235 | 2144 | ||
2236 | if (m->top != 0) { /* check top chunk */ |
2145 | if (m->top != 0) { /* check top chunk */ |
2237 | do_check_top_chunk(m, m->top); |
2146 | do_check_top_chunk(m, m->top); |
2238 | assert(m->topsize == chunksize(m->top)); |
2147 | assert(m->topsize == chunksize(m->top)); |
2239 | assert(m->topsize > 0); |
2148 | assert(m->topsize > 0); |
2240 | assert(bin_find(m, m->top) == 0); |
2149 | assert(bin_find(m, m->top) == 0); |
2241 | } |
2150 | } |
2242 | 2151 | ||
2243 | total = traverse_and_check(m); |
2152 | total = traverse_and_check(m); |
2244 | assert(total <= m->footprint); |
2153 | assert(total <= m->footprint); |
2245 | assert(m->footprint <= m->max_footprint); |
2154 | assert(m->footprint <= m->max_footprint); |
2246 | } |
2155 | } |
2247 | #endif /* DEBUG */ |
2156 | #endif /* DEBUG */ |
2248 | 2157 | ||
2249 | /* ----------------------------- statistics ------------------------------ */ |
2158 | /* ----------------------------- statistics ------------------------------ */ |
2250 | 2159 | ||
2251 | #if !NO_MALLINFO |
2160 | #if !NO_MALLINFO |
2252 | static struct mallinfo internal_mallinfo(mstate m) { |
2161 | static struct mallinfo internal_mallinfo(mstate m) { |
2253 | struct mallinfo nm = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; |
2162 | struct mallinfo nm = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; |
2254 | if (!PREACTION(m)) { |
2163 | if (!PREACTION(m)) { |
2255 | check_malloc_state(m); |
2164 | check_malloc_state(m); |
2256 | if (is_initialized(m)) { |
2165 | if (is_initialized(m)) { |
2257 | size_t nfree = SIZE_T_ONE; /* top always free */ |
2166 | size_t nfree = SIZE_T_ONE; /* top always free */ |
2258 | size_t mfree = m->topsize + TOP_FOOT_SIZE; |
2167 | size_t mfree = m->topsize + TOP_FOOT_SIZE; |
2259 | size_t sum = mfree; |
2168 | size_t sum = mfree; |
2260 | msegmentptr s = &m->seg; |
2169 | msegmentptr s = &m->seg; |
2261 | while (s != 0) { |
2170 | while (s != 0) { |
2262 | mchunkptr q = align_as_chunk(s->base); |
2171 | mchunkptr q = align_as_chunk(s->base); |
2263 | while (segment_holds(s, q) && |
2172 | while (segment_holds(s, q) && |
2264 | q != m->top && q->head != FENCEPOST_HEAD) { |
2173 | q != m->top && q->head != FENCEPOST_HEAD) { |
2265 | size_t sz = chunksize(q); |
2174 | size_t sz = chunksize(q); |
2266 | sum += sz; |
2175 | sum += sz; |
2267 | if (!cinuse(q)) { |
2176 | if (!cinuse(q)) { |
2268 | mfree += sz; |
2177 | mfree += sz; |
2269 | ++nfree; |
2178 | ++nfree; |
2270 | } |
2179 | } |
2271 | q = next_chunk(q); |
2180 | q = next_chunk(q); |
2272 | } |
2181 | } |
2273 | s = s->next; |
2182 | s = s->next; |
2274 | } |
2183 | } |
2275 | 2184 | ||
2276 | nm.arena = sum; |
2185 | nm.arena = sum; |
2277 | nm.ordblks = nfree; |
2186 | nm.ordblks = nfree; |
2278 | nm.hblkhd = m->footprint - sum; |
2187 | nm.hblkhd = m->footprint - sum; |
2279 | nm.usmblks = m->max_footprint; |
2188 | nm.usmblks = m->max_footprint; |
2280 | nm.uordblks = m->footprint - mfree; |
2189 | nm.uordblks = m->footprint - mfree; |
2281 | nm.fordblks = mfree; |
2190 | nm.fordblks = mfree; |
2282 | nm.keepcost = m->topsize; |
2191 | nm.keepcost = m->topsize; |
2283 | } |
2192 | } |
2284 | 2193 | ||
2285 | POSTACTION(m); |
2194 | POSTACTION(m); |
2286 | } |
2195 | } |
2287 | return nm; |
2196 | return nm; |
2288 | } |
2197 | } |
2289 | #endif /* !NO_MALLINFO */ |
2198 | #endif /* !NO_MALLINFO */ |
2290 | 2199 | ||
2291 | static void internal_malloc_stats(mstate m) { |
2200 | static void internal_malloc_stats(mstate m) { |
2292 | if (!PREACTION(m)) { |
2201 | if (!PREACTION(m)) { |
2293 | size_t maxfp = 0; |
2202 | size_t maxfp = 0; |
2294 | size_t fp = 0; |
2203 | size_t fp = 0; |
2295 | size_t used = 0; |
2204 | size_t used = 0; |
2296 | check_malloc_state(m); |
2205 | check_malloc_state(m); |
2297 | if (is_initialized(m)) { |
2206 | if (is_initialized(m)) { |
2298 | msegmentptr s = &m->seg; |
2207 | msegmentptr s = &m->seg; |
2299 | maxfp = m->max_footprint; |
2208 | maxfp = m->max_footprint; |
2300 | fp = m->footprint; |
2209 | fp = m->footprint; |
2301 | used = fp - (m->topsize + TOP_FOOT_SIZE); |
2210 | used = fp - (m->topsize + TOP_FOOT_SIZE); |
2302 | 2211 | ||
2303 | while (s != 0) { |
2212 | while (s != 0) { |
2304 | mchunkptr q = align_as_chunk(s->base); |
2213 | mchunkptr q = align_as_chunk(s->base); |
2305 | while (segment_holds(s, q) && |
2214 | while (segment_holds(s, q) && |
2306 | q != m->top && q->head != FENCEPOST_HEAD) { |
2215 | q != m->top && q->head != FENCEPOST_HEAD) { |
2307 | if (!cinuse(q)) |
2216 | if (!cinuse(q)) |
2308 | used -= chunksize(q); |
2217 | used -= chunksize(q); |
2309 | q = next_chunk(q); |
2218 | q = next_chunk(q); |
2310 | } |
2219 | } |
2311 | s = s->next; |
2220 | s = s->next; |
2312 | } |
2221 | } |
2313 | } |
2222 | } |
2314 | 2223 | ||
2315 | fprintf(stderr, "max system bytes = %10lu\n", (unsigned long)(maxfp)); |
2224 | fprintf(stderr, "max system bytes = %10lu\n", (unsigned long)(maxfp)); |
2316 | fprintf(stderr, "system bytes = %10lu\n", (unsigned long)(fp)); |
2225 | fprintf(stderr, "system bytes = %10lu\n", (unsigned long)(fp)); |
2317 | fprintf(stderr, "in use bytes = %10lu\n", (unsigned long)(used)); |
2226 | fprintf(stderr, "in use bytes = %10lu\n", (unsigned long)(used)); |
2318 | 2227 | ||
2319 | POSTACTION(m); |
2228 | POSTACTION(m); |
2320 | } |
2229 | } |
2321 | } |
2230 | } |
2322 | 2231 | ||
2323 | /* ----------------------- Operations on smallbins ----------------------- */ |
2232 | /* ----------------------- Operations on smallbins ----------------------- */ |
2324 | 2233 | ||
2325 | /* |
2234 | /* |
2326 | Various forms of linking and unlinking are defined as macros. Even |
2235 | Various forms of linking and unlinking are defined as macros. Even |
2327 | the ones for trees, which are very long but have very short typical |
2236 | the ones for trees, which are very long but have very short typical |
2328 | paths. This is ugly but reduces reliance on inlining support of |
2237 | paths. This is ugly but reduces reliance on inlining support of |
2329 | compilers. |
2238 | compilers. |
2330 | */ |
2239 | */ |
2331 | 2240 | ||
2332 | /* Link a free chunk into a smallbin */ |
2241 | /* Link a free chunk into a smallbin */ |
2333 | #define insert_small_chunk(M, P, S) {\ |
2242 | #define insert_small_chunk(M, P, S) {\ |
2334 | bindex_t I = small_index(S);\ |
2243 | bindex_t I = small_index(S);\ |
2335 | mchunkptr B = smallbin_at(M, I);\ |
2244 | mchunkptr B = smallbin_at(M, I);\ |
2336 | mchunkptr F = B;\ |
2245 | mchunkptr F = B;\ |
2337 | assert(S >= MIN_CHUNK_SIZE);\ |
2246 | assert(S >= MIN_CHUNK_SIZE);\ |
2338 | if (!smallmap_is_marked(M, I))\ |
2247 | if (!smallmap_is_marked(M, I))\ |
2339 | mark_smallmap(M, I);\ |
2248 | mark_smallmap(M, I);\ |
2340 | else if (RTCHECK(ok_address(M, B->fd)))\ |
2249 | else if (RTCHECK(ok_address(M, B->fd)))\ |
2341 | F = B->fd;\ |
2250 | F = B->fd;\ |
2342 | else {\ |
2251 | else {\ |
2343 | CORRUPTION_ERROR_ACTION(M);\ |
2252 | CORRUPTION_ERROR_ACTION(M);\ |
2344 | }\ |
2253 | }\ |
2345 | B->fd = P;\ |
2254 | B->fd = P;\ |
2346 | F->bk = P;\ |
2255 | F->bk = P;\ |
2347 | P->fd = F;\ |
2256 | P->fd = F;\ |
2348 | P->bk = B;\ |
2257 | P->bk = B;\ |
2349 | } |
2258 | } |
2350 | 2259 | ||
2351 | /* Unlink a chunk from a smallbin */ |
2260 | /* Unlink a chunk from a smallbin */ |
2352 | #define unlink_small_chunk(M, P, S) {\ |
2261 | #define unlink_small_chunk(M, P, S) {\ |
2353 | mchunkptr F = P->fd;\ |
2262 | mchunkptr F = P->fd;\ |
2354 | mchunkptr B = P->bk;\ |
2263 | mchunkptr B = P->bk;\ |
2355 | bindex_t I = small_index(S);\ |
2264 | bindex_t I = small_index(S);\ |
2356 | assert(P != B);\ |
2265 | assert(P != B);\ |
2357 | assert(P != F);\ |
2266 | assert(P != F);\ |
2358 | assert(chunksize(P) == small_index2size(I));\ |
2267 | assert(chunksize(P) == small_index2size(I));\ |
2359 | if (F == B)\ |
2268 | if (F == B)\ |
2360 | clear_smallmap(M, I);\ |
2269 | clear_smallmap(M, I);\ |
2361 | else if (RTCHECK((F == smallbin_at(M,I) || ok_address(M, F)) &&\ |
2270 | else if (RTCHECK((F == smallbin_at(M,I) || ok_address(M, F)) &&\ |
2362 | (B == smallbin_at(M,I) || ok_address(M, B)))) {\ |
2271 | (B == smallbin_at(M,I) || ok_address(M, B)))) {\ |
2363 | F->bk = B;\ |
2272 | F->bk = B;\ |
2364 | B->fd = F;\ |
2273 | B->fd = F;\ |
2365 | }\ |
2274 | }\ |
2366 | else {\ |
2275 | else {\ |
2367 | CORRUPTION_ERROR_ACTION(M);\ |
2276 | CORRUPTION_ERROR_ACTION(M);\ |
2368 | }\ |
2277 | }\ |
2369 | } |
2278 | } |
2370 | 2279 | ||
2371 | /* Unlink the first chunk from a smallbin */ |
2280 | /* Unlink the first chunk from a smallbin */ |
2372 | #define unlink_first_small_chunk(M, B, P, I) {\ |
2281 | #define unlink_first_small_chunk(M, B, P, I) {\ |
2373 | mchunkptr F = P->fd;\ |
2282 | mchunkptr F = P->fd;\ |
2374 | assert(P != B);\ |
2283 | assert(P != B);\ |
2375 | assert(P != F);\ |
2284 | assert(P != F);\ |
2376 | assert(chunksize(P) == small_index2size(I));\ |
2285 | assert(chunksize(P) == small_index2size(I));\ |
2377 | if (B == F)\ |
2286 | if (B == F)\ |
2378 | clear_smallmap(M, I);\ |
2287 | clear_smallmap(M, I);\ |
2379 | else if (RTCHECK(ok_address(M, F))) {\ |
2288 | else if (RTCHECK(ok_address(M, F))) {\ |
2380 | B->fd = F;\ |
2289 | B->fd = F;\ |
2381 | F->bk = B;\ |
2290 | F->bk = B;\ |
2382 | }\ |
2291 | }\ |
2383 | else {\ |
2292 | else {\ |
2384 | CORRUPTION_ERROR_ACTION(M);\ |
2293 | CORRUPTION_ERROR_ACTION(M);\ |
2385 | }\ |
2294 | }\ |
2386 | } |
2295 | } |
2387 | 2296 | ||
2388 | /* Replace dv node, binning the old one */ |
2297 | /* Replace dv node, binning the old one */ |
2389 | /* Used only when dvsize known to be small */ |
2298 | /* Used only when dvsize known to be small */ |
2390 | #define replace_dv(M, P, S) {\ |
2299 | #define replace_dv(M, P, S) {\ |
2391 | size_t DVS = M->dvsize;\ |
2300 | size_t DVS = M->dvsize;\ |
2392 | if (DVS != 0) {\ |
2301 | if (DVS != 0) {\ |
2393 | mchunkptr DV = M->dv;\ |
2302 | mchunkptr DV = M->dv;\ |
2394 | assert(is_small(DVS));\ |
2303 | assert(is_small(DVS));\ |
2395 | insert_small_chunk(M, DV, DVS);\ |
2304 | insert_small_chunk(M, DV, DVS);\ |
2396 | }\ |
2305 | }\ |
2397 | M->dvsize = S;\ |
2306 | M->dvsize = S;\ |
2398 | M->dv = P;\ |
2307 | M->dv = P;\ |
2399 | } |
2308 | } |
2400 | 2309 | ||
2401 | /* ------------------------- Operations on trees ------------------------- */ |
2310 | /* ------------------------- Operations on trees ------------------------- */ |
2402 | 2311 | ||
2403 | /* Insert chunk into tree */ |
2312 | /* Insert chunk into tree */ |
2404 | #define insert_large_chunk(M, X, S) {\ |
2313 | #define insert_large_chunk(M, X, S) {\ |
2405 | tbinptr* H;\ |
2314 | tbinptr* H;\ |
2406 | bindex_t I;\ |
2315 | bindex_t I;\ |
2407 | compute_tree_index(S, I);\ |
2316 | compute_tree_index(S, I);\ |
2408 | H = treebin_at(M, I);\ |
2317 | H = treebin_at(M, I);\ |
2409 | X->index = I;\ |
2318 | X->index = I;\ |
2410 | X->child[0] = X->child[1] = 0;\ |
2319 | X->child[0] = X->child[1] = 0;\ |
2411 | if (!treemap_is_marked(M, I)) {\ |
2320 | if (!treemap_is_marked(M, I)) {\ |
2412 | mark_treemap(M, I);\ |
2321 | mark_treemap(M, I);\ |
2413 | *H = X;\ |
2322 | *H = X;\ |
2414 | X->parent = (tchunkptr)H;\ |
2323 | X->parent = (tchunkptr)H;\ |
2415 | X->fd = X->bk = X;\ |
2324 | X->fd = X->bk = X;\ |
2416 | }\ |
2325 | }\ |
2417 | else {\ |
2326 | else {\ |
2418 | tchunkptr T = *H;\ |
2327 | tchunkptr T = *H;\ |
2419 | size_t K = S << leftshift_for_tree_index(I);\ |
2328 | size_t K = S << leftshift_for_tree_index(I);\ |
2420 | for (;;) {\ |
2329 | for (;;) {\ |
2421 | if (chunksize(T) != S) {\ |
2330 | if (chunksize(T) != S) {\ |
2422 | tchunkptr* C = &(T->child[(K >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]);\ |
2331 | tchunkptr* C = &(T->child[(K >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]);\ |
2423 | K <<= 1;\ |
2332 | K <<= 1;\ |
2424 | if (*C != 0)\ |
2333 | if (*C != 0)\ |
2425 | T = *C;\ |
2334 | T = *C;\ |
2426 | else if (RTCHECK(ok_address(M, C))) {\ |
2335 | else if (RTCHECK(ok_address(M, C))) {\ |
2427 | *C = X;\ |
2336 | *C = X;\ |
2428 | X->parent = T;\ |
2337 | X->parent = T;\ |
2429 | X->fd = X->bk = X;\ |
2338 | X->fd = X->bk = X;\ |
2430 | break;\ |
2339 | break;\ |
2431 | }\ |
2340 | }\ |
2432 | else {\ |
2341 | else {\ |
2433 | CORRUPTION_ERROR_ACTION(M);\ |
2342 | CORRUPTION_ERROR_ACTION(M);\ |
2434 | break;\ |
2343 | break;\ |
2435 | }\ |
2344 | }\ |
2436 | }\ |
2345 | }\ |
2437 | else {\ |
2346 | else {\ |
2438 | tchunkptr F = T->fd;\ |
2347 | tchunkptr F = T->fd;\ |
2439 | if (RTCHECK(ok_address(M, T) && ok_address(M, F))) {\ |
2348 | if (RTCHECK(ok_address(M, T) && ok_address(M, F))) {\ |
2440 | T->fd = F->bk = X;\ |
2349 | T->fd = F->bk = X;\ |
2441 | X->fd = F;\ |
2350 | X->fd = F;\ |
2442 | X->bk = T;\ |
2351 | X->bk = T;\ |
2443 | X->parent = 0;\ |
2352 | X->parent = 0;\ |
2444 | break;\ |
2353 | break;\ |
2445 | }\ |
2354 | }\ |
2446 | else {\ |
2355 | else {\ |
2447 | CORRUPTION_ERROR_ACTION(M);\ |
2356 | CORRUPTION_ERROR_ACTION(M);\ |
2448 | break;\ |
2357 | break;\ |
2449 | }\ |
2358 | }\ |
2450 | }\ |
2359 | }\ |
2451 | }\ |
2360 | }\ |
2452 | }\ |
2361 | }\ |
2453 | } |
2362 | } |
2454 | 2363 | ||
2455 | /* |
2364 | /* |
2456 | Unlink steps: |
2365 | Unlink steps: |
2457 | 2366 | ||
2458 | 1. If x is a chained node, unlink it from its same-sized fd/bk links |
2367 | 1. If x is a chained node, unlink it from its same-sized fd/bk links |
2459 | and choose its bk node as its replacement. |
2368 | and choose its bk node as its replacement. |
2460 | 2. If x was the last node of its size, but not a leaf node, it must |
2369 | 2. If x was the last node of its size, but not a leaf node, it must |
2461 | be replaced with a leaf node (not merely one with an open left or |
2370 | be replaced with a leaf node (not merely one with an open left or |
2462 | right), to make sure that lefts and rights of descendents |
2371 | right), to make sure that lefts and rights of descendents |
2463 | correspond properly to bit masks. We use the rightmost descendent |
2372 | correspond properly to bit masks. We use the rightmost descendent |
2464 | of x. We could use any other leaf, but this is easy to locate and |
2373 | of x. We could use any other leaf, but this is easy to locate and |
2465 | tends to counteract removal of leftmosts elsewhere, and so keeps |
2374 | tends to counteract removal of leftmosts elsewhere, and so keeps |
2466 | paths shorter than minimally guaranteed. This doesn't loop much |
2375 | paths shorter than minimally guaranteed. This doesn't loop much |
2467 | because on average a node in a tree is near the bottom. |
2376 | because on average a node in a tree is near the bottom. |
2468 | 3. If x is the base of a chain (i.e., has parent links) relink |
2377 | 3. If x is the base of a chain (i.e., has parent links) relink |
2469 | x's parent and children to x's replacement (or null if none). |
2378 | x's parent and children to x's replacement (or null if none). |
2470 | */ |
2379 | */ |
2471 | 2380 | ||
2472 | #define unlink_large_chunk(M, X) {\ |
2381 | #define unlink_large_chunk(M, X) {\ |
2473 | tchunkptr XP = X->parent;\ |
2382 | tchunkptr XP = X->parent;\ |
2474 | tchunkptr R;\ |
2383 | tchunkptr R;\ |
2475 | if (X->bk != X) {\ |
2384 | if (X->bk != X) {\ |
2476 | tchunkptr F = X->fd;\ |
2385 | tchunkptr F = X->fd;\ |
2477 | R = X->bk;\ |
2386 | R = X->bk;\ |
2478 | if (RTCHECK(ok_address(M, F))) {\ |
2387 | if (RTCHECK(ok_address(M, F))) {\ |
2479 | F->bk = R;\ |
2388 | F->bk = R;\ |
2480 | R->fd = F;\ |
2389 | R->fd = F;\ |
2481 | }\ |
2390 | }\ |
2482 | else {\ |
2391 | else {\ |
2483 | CORRUPTION_ERROR_ACTION(M);\ |
2392 | CORRUPTION_ERROR_ACTION(M);\ |
2484 | }\ |
2393 | }\ |
2485 | }\ |
2394 | }\ |
2486 | else {\ |
2395 | else {\ |
2487 | tchunkptr* RP;\ |
2396 | tchunkptr* RP;\ |
2488 | if (((R = *(RP = &(X->child[1]))) != 0) ||\ |
2397 | if (((R = *(RP = &(X->child[1]))) != 0) ||\ |
2489 | ((R = *(RP = &(X->child[0]))) != 0)) {\ |
2398 | ((R = *(RP = &(X->child[0]))) != 0)) {\ |
2490 | tchunkptr* CP;\ |
2399 | tchunkptr* CP;\ |
2491 | while ((*(CP = &(R->child[1])) != 0) ||\ |
2400 | while ((*(CP = &(R->child[1])) != 0) ||\ |
2492 | (*(CP = &(R->child[0])) != 0)) {\ |
2401 | (*(CP = &(R->child[0])) != 0)) {\ |
2493 | R = *(RP = CP);\ |
2402 | R = *(RP = CP);\ |
2494 | }\ |
2403 | }\ |
2495 | if (RTCHECK(ok_address(M, RP)))\ |
2404 | if (RTCHECK(ok_address(M, RP)))\ |
2496 | *RP = 0;\ |
2405 | *RP = 0;\ |
2497 | else {\ |
2406 | else {\ |
2498 | CORRUPTION_ERROR_ACTION(M);\ |
2407 | CORRUPTION_ERROR_ACTION(M);\ |
2499 | }\ |
2408 | }\ |
2500 | }\ |
2409 | }\ |
2501 | }\ |
2410 | }\ |
2502 | if (XP != 0) {\ |
2411 | if (XP != 0) {\ |
2503 | tbinptr* H = treebin_at(M, X->index);\ |
2412 | tbinptr* H = treebin_at(M, X->index);\ |
2504 | if (X == *H) {\ |
2413 | if (X == *H) {\ |
2505 | if ((*H = R) == 0) \ |
2414 | if ((*H = R) == 0) \ |
2506 | clear_treemap(M, X->index);\ |
2415 | clear_treemap(M, X->index);\ |
2507 | }\ |
2416 | }\ |
2508 | else if (RTCHECK(ok_address(M, XP))) {\ |
2417 | else if (RTCHECK(ok_address(M, XP))) {\ |
2509 | if (XP->child[0] == X) \ |
2418 | if (XP->child[0] == X) \ |
2510 | XP->child[0] = R;\ |
2419 | XP->child[0] = R;\ |
2511 | else \ |
2420 | else \ |
2512 | XP->child[1] = R;\ |
2421 | XP->child[1] = R;\ |
2513 | }\ |
2422 | }\ |
2514 | else\ |
2423 | else\ |
2515 | CORRUPTION_ERROR_ACTION(M);\ |
2424 | CORRUPTION_ERROR_ACTION(M);\ |
2516 | if (R != 0) {\ |
2425 | if (R != 0) {\ |
2517 | if (RTCHECK(ok_address(M, R))) {\ |
2426 | if (RTCHECK(ok_address(M, R))) {\ |
2518 | tchunkptr C0, C1;\ |
2427 | tchunkptr C0, C1;\ |
2519 | R->parent = XP;\ |
2428 | R->parent = XP;\ |
2520 | if ((C0 = X->child[0]) != 0) {\ |
2429 | if ((C0 = X->child[0]) != 0) {\ |
2521 | if (RTCHECK(ok_address(M, C0))) {\ |
2430 | if (RTCHECK(ok_address(M, C0))) {\ |
2522 | R->child[0] = C0;\ |
2431 | R->child[0] = C0;\ |
2523 | C0->parent = R;\ |
2432 | C0->parent = R;\ |
2524 | }\ |
2433 | }\ |
2525 | else\ |
2434 | else\ |
2526 | CORRUPTION_ERROR_ACTION(M);\ |
2435 | CORRUPTION_ERROR_ACTION(M);\ |
2527 | }\ |
2436 | }\ |
2528 | if ((C1 = X->child[1]) != 0) {\ |
2437 | if ((C1 = X->child[1]) != 0) {\ |
2529 | if (RTCHECK(ok_address(M, C1))) {\ |
2438 | if (RTCHECK(ok_address(M, C1))) {\ |
2530 | R->child[1] = C1;\ |
2439 | R->child[1] = C1;\ |
2531 | C1->parent = R;\ |
2440 | C1->parent = R;\ |
2532 | }\ |
2441 | }\ |
2533 | else\ |
2442 | else\ |
2534 | CORRUPTION_ERROR_ACTION(M);\ |
2443 | CORRUPTION_ERROR_ACTION(M);\ |
2535 | }\ |
2444 | }\ |
2536 | }\ |
2445 | }\ |
2537 | else\ |
2446 | else\ |
2538 | CORRUPTION_ERROR_ACTION(M);\ |
2447 | CORRUPTION_ERROR_ACTION(M);\ |
2539 | }\ |
2448 | }\ |
2540 | }\ |
2449 | }\ |
2541 | } |
2450 | } |
2542 | 2451 | ||
2543 | /* Relays to large vs small bin operations */ |
2452 | /* Relays to large vs small bin operations */ |
2544 | 2453 | ||
2545 | #define insert_chunk(M, P, S)\ |
2454 | #define insert_chunk(M, P, S)\ |
2546 | if (is_small(S)) insert_small_chunk(M, P, S)\ |
2455 | if (is_small(S)) insert_small_chunk(M, P, S)\ |
2547 | else { tchunkptr TP = (tchunkptr)(P); insert_large_chunk(M, TP, S); } |
2456 | else { tchunkptr TP = (tchunkptr)(P); insert_large_chunk(M, TP, S); } |
2548 | 2457 | ||
2549 | #define unlink_chunk(M, P, S)\ |
2458 | #define unlink_chunk(M, P, S)\ |
2550 | if (is_small(S)) unlink_small_chunk(M, P, S)\ |
2459 | if (is_small(S)) unlink_small_chunk(M, P, S)\ |
2551 | else { tchunkptr TP = (tchunkptr)(P); unlink_large_chunk(M, TP); } |
2460 | else { tchunkptr TP = (tchunkptr)(P); unlink_large_chunk(M, TP); } |
2552 | 2461 | ||
2553 | 2462 | ||
2554 | /* Relays to internal calls to malloc/free from realloc, memalign etc */ |
2463 | /* Relays to internal calls to malloc/free from realloc, memalign etc */ |
2555 | 2464 | ||
2556 | #if ONLY_MSPACES |
2465 | #if ONLY_MSPACES |
2557 | #define internal_malloc(m, b) mspace_malloc(m, b) |
2466 | #define internal_malloc(m, b) mspace_malloc(m, b) |
2558 | #define internal_free(m, mem) mspace_free(m,mem); |
2467 | #define internal_free(m, mem) mspace_free(m,mem); |
2559 | #else /* ONLY_MSPACES */ |
2468 | #else /* ONLY_MSPACES */ |
2560 | #if MSPACES |
2469 | #if MSPACES |
2561 | #define internal_malloc(m, b)\ |
2470 | #define internal_malloc(m, b)\ |
2562 | (m == gm)? dlmalloc(b) : mspace_malloc(m, b) |
2471 | (m == gm)? dlmalloc(b) : mspace_malloc(m, b) |
2563 | #define internal_free(m, mem)\ |
2472 | #define internal_free(m, mem)\ |
2564 | if (m == gm) dlfree(mem); else mspace_free(m,mem); |
2473 | if (m == gm) dlfree(mem); else mspace_free(m,mem); |
2565 | #else /* MSPACES */ |
2474 | #else /* MSPACES */ |
2566 | #define internal_malloc(m, b) dlmalloc(b) |
2475 | #define internal_malloc(m, b) dlmalloc(b) |
2567 | #define internal_free(m, mem) dlfree(mem) |
2476 | #define internal_free(m, mem) dlfree(mem) |
2568 | #endif /* MSPACES */ |
2477 | #endif /* MSPACES */ |
2569 | #endif /* ONLY_MSPACES */ |
2478 | #endif /* ONLY_MSPACES */ |
2570 | 2479 | ||
2571 | /* ----------------------- Direct-mmapping chunks ----------------------- */ |
2480 | /* ----------------------- Direct-mmapping chunks ----------------------- */ |
2572 | 2481 | ||
2573 | /* |
2482 | /* |
2574 | Directly mmapped chunks are set up with an offset to the start of |
2483 | Directly mmapped chunks are set up with an offset to the start of |
2575 | the mmapped region stored in the prev_foot field of the chunk. This |
2484 | the mmapped region stored in the prev_foot field of the chunk. This |
2576 | allows reconstruction of the required argument to MUNMAP when freed, |
2485 | allows reconstruction of the required argument to MUNMAP when freed, |
2577 | and also allows adjustment of the returned chunk to meet alignment |
2486 | and also allows adjustment of the returned chunk to meet alignment |
2578 | requirements (especially in memalign). There is also enough space |
2487 | requirements (especially in memalign). There is also enough space |
2579 | allocated to hold a fake next chunk of size SIZE_T_SIZE to maintain |
2488 | allocated to hold a fake next chunk of size SIZE_T_SIZE to maintain |
2580 | the PINUSE bit so frees can be checked. |
2489 | the PINUSE bit so frees can be checked. |
2581 | */ |
2490 | */ |
2582 | 2491 | ||
2583 | /* Malloc using mmap */ |
2492 | /* Malloc using mmap */ |
2584 | static void* mmap_alloc(mstate m, size_t nb) { |
2493 | static void* mmap_alloc(mstate m, size_t nb) { |
2585 | size_t mmsize = granularity_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK); |
2494 | size_t mmsize = granularity_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK); |
2586 | if (mmsize > nb) { /* Check for wrap around 0 */ |
2495 | if (mmsize > nb) { /* Check for wrap around 0 */ |
2587 | char* mm = (char*)(DIRECT_MMAP(mmsize)); |
2496 | char* mm = (char*)(DIRECT_MMAP(mmsize)); |
2588 | if (mm != CMFAIL) { |
2497 | if (mm != CMFAIL) { |
2589 | size_t offset = align_offset(chunk2mem(mm)); |
2498 | size_t offset = align_offset(chunk2mem(mm)); |
2590 | size_t psize = mmsize - offset - MMAP_FOOT_PAD; |
2499 | size_t psize = mmsize - offset - MMAP_FOOT_PAD; |
2591 | mchunkptr p = (mchunkptr)(mm + offset); |
2500 | mchunkptr p = (mchunkptr)(mm + offset); |
2592 | p->prev_foot = offset | IS_MMAPPED_BIT; |
2501 | p->prev_foot = offset | IS_MMAPPED_BIT; |
2593 | (p)->head = (psize|CINUSE_BIT); |
2502 | (p)->head = (psize|CINUSE_BIT); |
2594 | mark_inuse_foot(m, p, psize); |
2503 | mark_inuse_foot(m, p, psize); |
2595 | chunk_plus_offset(p, psize)->head = FENCEPOST_HEAD; |
2504 | chunk_plus_offset(p, psize)->head = FENCEPOST_HEAD; |
2596 | chunk_plus_offset(p, psize+SIZE_T_SIZE)->head = 0; |
2505 | chunk_plus_offset(p, psize+SIZE_T_SIZE)->head = 0; |
2597 | 2506 | ||
2598 | if (mm < m->least_addr) |
2507 | if (mm < m->least_addr) |
2599 | m->least_addr = mm; |
2508 | m->least_addr = mm; |
2600 | if ((m->footprint += mmsize) > m->max_footprint) |
2509 | if ((m->footprint += mmsize) > m->max_footprint) |
2601 | m->max_footprint = m->footprint; |
2510 | m->max_footprint = m->footprint; |
2602 | assert(is_aligned(chunk2mem(p))); |
2511 | assert(is_aligned(chunk2mem(p))); |
2603 | check_mmapped_chunk(m, p); |
2512 | check_mmapped_chunk(m, p); |
2604 | return chunk2mem(p); |
2513 | return chunk2mem(p); |
2605 | } |
2514 | } |
2606 | } |
2515 | } |
2607 | return 0; |
2516 | return 0; |
2608 | } |
2517 | } |
2609 | 2518 | ||
2610 | /* Realloc using mmap */ |
2519 | /* Realloc using mmap */ |
2611 | static mchunkptr mmap_resize(mstate m, mchunkptr oldp, size_t nb) { |
2520 | static mchunkptr mmap_resize(mstate m, mchunkptr oldp, size_t nb) { |
2612 | size_t oldsize = chunksize(oldp); |
2521 | size_t oldsize = chunksize(oldp); |
2613 | if (is_small(nb)) /* Can't shrink mmap regions below small size */ |
2522 | if (is_small(nb)) /* Can't shrink mmap regions below small size */ |
2614 | return 0; |
2523 | return 0; |
2615 | /* Keep old chunk if big enough but not too big */ |
2524 | /* Keep old chunk if big enough but not too big */ |
2616 | if (oldsize >= nb + SIZE_T_SIZE && |
2525 | if (oldsize >= nb + SIZE_T_SIZE && |
2617 | (oldsize - nb) <= (mparams.granularity << 1)) |
2526 | (oldsize - nb) <= (mparams.granularity << 1)) |
2618 | return oldp; |
2527 | return oldp; |
2619 | else { |
2528 | else { |
2620 | size_t offset = oldp->prev_foot & ~IS_MMAPPED_BIT; |
2529 | size_t offset = oldp->prev_foot & ~IS_MMAPPED_BIT; |
2621 | size_t oldmmsize = oldsize + offset + MMAP_FOOT_PAD; |
2530 | size_t oldmmsize = oldsize + offset + MMAP_FOOT_PAD; |
2622 | size_t newmmsize = granularity_align(nb + SIX_SIZE_T_SIZES + |
2531 | size_t newmmsize = granularity_align(nb + SIX_SIZE_T_SIZES + |
2623 | CHUNK_ALIGN_MASK); |
2532 | CHUNK_ALIGN_MASK); |
2624 | char* cp = (char*)CALL_MREMAP((char*)oldp - offset, |
2533 | char* cp = (char*)CALL_MREMAP((char*)oldp - offset, |
2625 | oldmmsize, newmmsize, 1); |
2534 | oldmmsize, newmmsize, 1); |
2626 | if (cp != CMFAIL) { |
2535 | if (cp != CMFAIL) { |
2627 | mchunkptr newp = (mchunkptr)(cp + offset); |
2536 | mchunkptr newp = (mchunkptr)(cp + offset); |
2628 | size_t psize = newmmsize - offset - MMAP_FOOT_PAD; |
2537 | size_t psize = newmmsize - offset - MMAP_FOOT_PAD; |
2629 | newp->head = (psize|CINUSE_BIT); |
2538 | newp->head = (psize|CINUSE_BIT); |
2630 | mark_inuse_foot(m, newp, psize); |
2539 | mark_inuse_foot(m, newp, psize); |
2631 | chunk_plus_offset(newp, psize)->head = FENCEPOST_HEAD; |
2540 | chunk_plus_offset(newp, psize)->head = FENCEPOST_HEAD; |
2632 | chunk_plus_offset(newp, psize+SIZE_T_SIZE)->head = 0; |
2541 | chunk_plus_offset(newp, psize+SIZE_T_SIZE)->head = 0; |
2633 | 2542 | ||
2634 | if (cp < m->least_addr) |
2543 | if (cp < m->least_addr) |
2635 | m->least_addr = cp; |
2544 | m->least_addr = cp; |
2636 | if ((m->footprint += newmmsize - oldmmsize) > m->max_footprint) |
2545 | if ((m->footprint += newmmsize - oldmmsize) > m->max_footprint) |
2637 | m->max_footprint = m->footprint; |
2546 | m->max_footprint = m->footprint; |
2638 | check_mmapped_chunk(m, newp); |
2547 | check_mmapped_chunk(m, newp); |
2639 | return newp; |
2548 | return newp; |
2640 | } |
2549 | } |
2641 | } |
2550 | } |
2642 | return 0; |
2551 | return 0; |
2643 | } |
2552 | } |
2644 | 2553 | ||
2645 | /* -------------------------- mspace management -------------------------- */ |
2554 | /* -------------------------- mspace management -------------------------- */ |
2646 | 2555 | ||
2647 | /* Initialize top chunk and its size */ |
2556 | /* Initialize top chunk and its size */ |
2648 | static void init_top(mstate m, mchunkptr p, size_t psize) { |
2557 | static void init_top(mstate m, mchunkptr p, size_t psize) { |
2649 | /* Ensure alignment */ |
2558 | /* Ensure alignment */ |
2650 | size_t offset = align_offset(chunk2mem(p)); |
2559 | size_t offset = align_offset(chunk2mem(p)); |
2651 | p = (mchunkptr)((char*)p + offset); |
2560 | p = (mchunkptr)((char*)p + offset); |
2652 | psize -= offset; |
2561 | psize -= offset; |
2653 | 2562 | ||
2654 | m->top = p; |
2563 | m->top = p; |
2655 | m->topsize = psize; |
2564 | m->topsize = psize; |
2656 | p->head = psize | PINUSE_BIT; |
2565 | p->head = psize | PINUSE_BIT; |
2657 | /* set size of fake trailing chunk holding overhead space only once */ |
2566 | /* set size of fake trailing chunk holding overhead space only once */ |
2658 | chunk_plus_offset(p, psize)->head = TOP_FOOT_SIZE; |
2567 | chunk_plus_offset(p, psize)->head = TOP_FOOT_SIZE; |
2659 | m->trim_check = mparams.trim_threshold; /* reset on each update */ |
2568 | m->trim_check = mparams.trim_threshold; /* reset on each update */ |
2660 | } |
2569 | } |
2661 | 2570 | ||
2662 | /* Initialize bins for a new mstate that is otherwise zeroed out */ |
2571 | /* Initialize bins for a new mstate that is otherwise zeroed out */ |
2663 | static void init_bins(mstate m) { |
2572 | static void init_bins(mstate m) { |
2664 | /* Establish circular links for smallbins */ |
2573 | /* Establish circular links for smallbins */ |
2665 | bindex_t i; |
2574 | bindex_t i; |
2666 | for (i = 0; i < NSMALLBINS; ++i) { |
2575 | for (i = 0; i < NSMALLBINS; ++i) { |
2667 | sbinptr bin = smallbin_at(m,i); |
2576 | sbinptr bin = smallbin_at(m,i); |
2668 | bin->fd = bin->bk = bin; |
2577 | bin->fd = bin->bk = bin; |
2669 | } |
2578 | } |
2670 | } |
2579 | } |
2671 | 2580 | ||
2672 | #if PROCEED_ON_ERROR |
2581 | #if PROCEED_ON_ERROR |
2673 | 2582 | ||
2674 | /* default corruption action */ |
2583 | /* default corruption action */ |
2675 | static void reset_on_error(mstate m) { |
2584 | static void reset_on_error(mstate m) { |
2676 | int i; |
2585 | int i; |
2677 | ++malloc_corruption_error_count; |
2586 | ++malloc_corruption_error_count; |
2678 | /* Reinitialize fields to forget about all memory */ |
2587 | /* Reinitialize fields to forget about all memory */ |
2679 | m->smallbins = m->treebins = 0; |
2588 | m->smallbins = m->treebins = 0; |
2680 | m->dvsize = m->topsize = 0; |
2589 | m->dvsize = m->topsize = 0; |
2681 | m->seg.base = 0; |
2590 | m->seg.base = 0; |
2682 | m->seg.size = 0; |
2591 | m->seg.size = 0; |
2683 | m->seg.next = 0; |
2592 | m->seg.next = 0; |
2684 | m->top = m->dv = 0; |
2593 | m->top = m->dv = 0; |
2685 | for (i = 0; i < NTREEBINS; ++i) |
2594 | for (i = 0; i < NTREEBINS; ++i) |
2686 | *treebin_at(m, i) = 0; |
2595 | *treebin_at(m, i) = 0; |
2687 | init_bins(m); |
2596 | init_bins(m); |
2688 | } |
2597 | } |
2689 | #endif /* PROCEED_ON_ERROR */ |
2598 | #endif /* PROCEED_ON_ERROR */ |
2690 | 2599 | ||
2691 | /* Allocate chunk and prepend remainder with chunk in successor base. */ |
2600 | /* Allocate chunk and prepend remainder with chunk in successor base. */ |
2692 | static void* prepend_alloc(mstate m, char* newbase, char* oldbase, |
2601 | static void* prepend_alloc(mstate m, char* newbase, char* oldbase, |
2693 | size_t nb) { |
2602 | size_t nb) { |
2694 | mchunkptr p = align_as_chunk(newbase); |
2603 | mchunkptr p = align_as_chunk(newbase); |
2695 | mchunkptr oldfirst = align_as_chunk(oldbase); |
2604 | mchunkptr oldfirst = align_as_chunk(oldbase); |
2696 | size_t psize = (char*)oldfirst - (char*)p; |
2605 | size_t psize = (char*)oldfirst - (char*)p; |
2697 | mchunkptr q = chunk_plus_offset(p, nb); |
2606 | mchunkptr q = chunk_plus_offset(p, nb); |
2698 | size_t qsize = psize - nb; |
2607 | size_t qsize = psize - nb; |
2699 | set_size_and_pinuse_of_inuse_chunk(m, p, nb); |
2608 | set_size_and_pinuse_of_inuse_chunk(m, p, nb); |
2700 | 2609 | ||
2701 | assert((char*)oldfirst > (char*)q); |
2610 | assert((char*)oldfirst > (char*)q); |
2702 | assert(pinuse(oldfirst)); |
2611 | assert(pinuse(oldfirst)); |
2703 | assert(qsize >= MIN_CHUNK_SIZE); |
2612 | assert(qsize >= MIN_CHUNK_SIZE); |
2704 | 2613 | ||
2705 | /* consolidate remainder with first chunk of old base */ |
2614 | /* consolidate remainder with first chunk of old base */ |
2706 | if (oldfirst == m->top) { |
2615 | if (oldfirst == m->top) { |
2707 | size_t tsize = m->topsize += qsize; |
2616 | size_t tsize = m->topsize += qsize; |
2708 | m->top = q; |
2617 | m->top = q; |
2709 | q->head = tsize | PINUSE_BIT; |
2618 | q->head = tsize | PINUSE_BIT; |
2710 | check_top_chunk(m, q); |
2619 | check_top_chunk(m, q); |
2711 | } |
2620 | } |
2712 | else if (oldfirst == m->dv) { |
2621 | else if (oldfirst == m->dv) { |
2713 | size_t dsize = m->dvsize += qsize; |
2622 | size_t dsize = m->dvsize += qsize; |
2714 | m->dv = q; |
2623 | m->dv = q; |
2715 | set_size_and_pinuse_of_free_chunk(q, dsize); |
2624 | set_size_and_pinuse_of_free_chunk(q, dsize); |
2716 | } |
2625 | } |
2717 | else { |
2626 | else { |
2718 | if (!cinuse(oldfirst)) { |
2627 | if (!cinuse(oldfirst)) { |
2719 | size_t nsize = chunksize(oldfirst); |
2628 | size_t nsize = chunksize(oldfirst); |
2720 | unlink_chunk(m, oldfirst, nsize); |
2629 | unlink_chunk(m, oldfirst, nsize); |
2721 | oldfirst = chunk_plus_offset(oldfirst, nsize); |
2630 | oldfirst = chunk_plus_offset(oldfirst, nsize); |
2722 | qsize += nsize; |
2631 | qsize += nsize; |
2723 | } |
2632 | } |
2724 | set_free_with_pinuse(q, qsize, oldfirst); |
2633 | set_free_with_pinuse(q, qsize, oldfirst); |
2725 | insert_chunk(m, q, qsize); |
2634 | insert_chunk(m, q, qsize); |
2726 | check_free_chunk(m, q); |
2635 | check_free_chunk(m, q); |
2727 | } |
2636 | } |
2728 | 2637 | ||
2729 | check_malloced_chunk(m, chunk2mem(p), nb); |
2638 | check_malloced_chunk(m, chunk2mem(p), nb); |
2730 | return chunk2mem(p); |
2639 | return chunk2mem(p); |
2731 | } |
2640 | } |
2732 | 2641 | ||
2733 | 2642 | ||
2734 | /* Add a segment to hold a new noncontiguous region */ |
2643 | /* Add a segment to hold a new noncontiguous region */ |
2735 | static void add_segment(mstate m, char* tbase, size_t tsize, flag_t mmapped) { |
2644 | static void add_segment(mstate m, char* tbase, size_t tsize, flag_t mmapped) { |
2736 | /* Determine locations and sizes of segment, fenceposts, old top */ |
2645 | /* Determine locations and sizes of segment, fenceposts, old top */ |
2737 | char* old_top = (char*)m->top; |
2646 | char* old_top = (char*)m->top; |
2738 | msegmentptr oldsp = segment_holding(m, old_top); |
2647 | msegmentptr oldsp = segment_holding(m, old_top); |
2739 | char* old_end = oldsp->base + oldsp->size; |
2648 | char* old_end = oldsp->base + oldsp->size; |
2740 | size_t ssize = pad_request(sizeof(struct malloc_segment)); |
2649 | size_t ssize = pad_request(sizeof(struct malloc_segment)); |
2741 | char* rawsp = old_end - (ssize + FOUR_SIZE_T_SIZES + CHUNK_ALIGN_MASK); |
2650 | char* rawsp = old_end - (ssize + FOUR_SIZE_T_SIZES + CHUNK_ALIGN_MASK); |
2742 | size_t offset = align_offset(chunk2mem(rawsp)); |
2651 | size_t offset = align_offset(chunk2mem(rawsp)); |
2743 | char* asp = rawsp + offset; |
2652 | char* asp = rawsp + offset; |
2744 | char* csp = (asp < (old_top + MIN_CHUNK_SIZE))? old_top : asp; |
2653 | char* csp = (asp < (old_top + MIN_CHUNK_SIZE))? old_top : asp; |
2745 | mchunkptr sp = (mchunkptr)csp; |
2654 | mchunkptr sp = (mchunkptr)csp; |
2746 | msegmentptr ss = (msegmentptr)(chunk2mem(sp)); |
2655 | msegmentptr ss = (msegmentptr)(chunk2mem(sp)); |
2747 | mchunkptr tnext = chunk_plus_offset(sp, ssize); |
2656 | mchunkptr tnext = chunk_plus_offset(sp, ssize); |
2748 | mchunkptr p = tnext; |
2657 | mchunkptr p = tnext; |
2749 | int nfences = 0; |
2658 | int nfences = 0; |
2750 | 2659 | ||
2751 | /* reset top to new space */ |
2660 | /* reset top to new space */ |
2752 | init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE); |
2661 | init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE); |
2753 | 2662 | ||
2754 | /* Set up segment record */ |
2663 | /* Set up segment record */ |
2755 | assert(is_aligned(ss)); |
2664 | assert(is_aligned(ss)); |
2756 | set_size_and_pinuse_of_inuse_chunk(m, sp, ssize); |
2665 | set_size_and_pinuse_of_inuse_chunk(m, sp, ssize); |
2757 | *ss = m->seg; /* Push current record */ |
2666 | *ss = m->seg; /* Push current record */ |
2758 | m->seg.base = tbase; |
2667 | m->seg.base = tbase; |
2759 | m->seg.size = tsize; |
2668 | m->seg.size = tsize; |
2760 | m->seg.sflags = mmapped; |
2669 | m->seg.sflags = mmapped; |
2761 | m->seg.next = ss; |
2670 | m->seg.next = ss; |
2762 | 2671 | ||
2763 | /* Insert trailing fenceposts */ |
2672 | /* Insert trailing fenceposts */ |
2764 | for (;;) { |
2673 | for (;;) { |
2765 | mchunkptr nextp = chunk_plus_offset(p, SIZE_T_SIZE); |
2674 | mchunkptr nextp = chunk_plus_offset(p, SIZE_T_SIZE); |
2766 | p->head = FENCEPOST_HEAD; |
2675 | p->head = FENCEPOST_HEAD; |
2767 | ++nfences; |
2676 | ++nfences; |
2768 | if ((char*)(&(nextp->head)) < old_end) |
2677 | if ((char*)(&(nextp->head)) < old_end) |
2769 | p = nextp; |
2678 | p = nextp; |
2770 | else |
2679 | else |
2771 | break; |
2680 | break; |
2772 | } |
2681 | } |
2773 | assert(nfences >= 2); |
2682 | assert(nfences >= 2); |
2774 | 2683 | ||
2775 | /* Insert the rest of old top into a bin as an ordinary free chunk */ |
2684 | /* Insert the rest of old top into a bin as an ordinary free chunk */ |
2776 | if (csp != old_top) { |
2685 | if (csp != old_top) { |
2777 | mchunkptr q = (mchunkptr)old_top; |
2686 | mchunkptr q = (mchunkptr)old_top; |
2778 | size_t psize = csp - old_top; |
2687 | size_t psize = csp - old_top; |
2779 | mchunkptr tn = chunk_plus_offset(q, psize); |
2688 | mchunkptr tn = chunk_plus_offset(q, psize); |
2780 | set_free_with_pinuse(q, psize, tn); |
2689 | set_free_with_pinuse(q, psize, tn); |
2781 | insert_chunk(m, q, psize); |
2690 | insert_chunk(m, q, psize); |
2782 | } |
2691 | } |
2783 | 2692 | ||
2784 | check_top_chunk(m, m->top); |
2693 | check_top_chunk(m, m->top); |
2785 | } |
2694 | } |
2786 | 2695 | ||
2787 | /* -------------------------- System allocation -------------------------- */ |
2696 | /* -------------------------- System allocation -------------------------- */ |
2788 | 2697 | ||
2789 | /* Get memory from system using MORECORE or MMAP */ |
2698 | /* Get memory from system using MORECORE or MMAP */ |
2790 | static void* sys_alloc(mstate m, size_t nb) { |
2699 | static void* sys_alloc(mstate m, size_t nb) { |
2791 | char* tbase = CMFAIL; |
2700 | char* tbase = CMFAIL; |
2792 | size_t tsize = 0; |
2701 | size_t tsize = 0; |
2793 | flag_t mmap_flag = 0; |
2702 | flag_t mmap_flag = 0; |
2794 | 2703 | ||
2795 | init_mparams(); |
2704 | init_mparams(); |
2796 | 2705 | ||
2797 | /* Directly map large chunks */ |
2706 | /* Directly map large chunks */ |
2798 | if (use_mmap(m) && nb >= mparams.mmap_threshold) { |
2707 | if (use_mmap(m) && nb >= mparams.mmap_threshold) { |
2799 | void* mem = mmap_alloc(m, nb); |
2708 | void* mem = mmap_alloc(m, nb); |
2800 | if (mem != 0) |
2709 | if (mem != 0) |
2801 | return mem; |
2710 | return mem; |
2802 | } |
2711 | } |
2803 | 2712 | ||
2804 | /* |
2713 | /* |
2805 | Try getting memory in any of three ways (in most-preferred to |
2714 | Try getting memory in any of three ways (in most-preferred to |
2806 | least-preferred order): |
2715 | least-preferred order): |
2807 | 1. A call to MORECORE that can normally contiguously extend memory. |
2716 | 1. A call to MORECORE that can normally contiguously extend memory. |
2808 | (disabled if not MORECORE_CONTIGUOUS or not HAVE_MORECORE or |
2717 | (disabled if not MORECORE_CONTIGUOUS or not HAVE_MORECORE or |
2809 | or main space is mmapped or a previous contiguous call failed) |
2718 | or main space is mmapped or a previous contiguous call failed) |
2810 | 2. A call to MMAP new space (disabled if not HAVE_MMAP). |
2719 | 2. A call to MMAP new space (disabled if not HAVE_MMAP). |
2811 | Note that under the default settings, if MORECORE is unable to |
2720 | Note that under the default settings, if MORECORE is unable to |
2812 | fulfill a request, and HAVE_MMAP is true, then mmap is |
2721 | fulfill a request, and HAVE_MMAP is true, then mmap is |
2813 | used as a noncontiguous system allocator. This is a useful backup |
2722 | used as a noncontiguous system allocator. This is a useful backup |
2814 | strategy for systems with holes in address spaces -- in this case |
2723 | strategy for systems with holes in address spaces -- in this case |
2815 | sbrk cannot contiguously expand the heap, but mmap may be able to |
2724 | sbrk cannot contiguously expand the heap, but mmap may be able to |
2816 | find space. |
2725 | find space. |
2817 | 3. A call to MORECORE that cannot usually contiguously extend memory. |
2726 | 3. A call to MORECORE that cannot usually contiguously extend memory. |
2818 | (disabled if not HAVE_MORECORE) |
2727 | (disabled if not HAVE_MORECORE) |
2819 | */ |
2728 | */ |
2820 | 2729 | ||
2821 | if (MORECORE_CONTIGUOUS && !use_noncontiguous(m)) { |
2730 | if (MORECORE_CONTIGUOUS && !use_noncontiguous(m)) { |
2822 | char* br = CMFAIL; |
2731 | char* br = CMFAIL; |
2823 | msegmentptr ss = (m->top == 0)? 0 : segment_holding(m, (char*)m->top); |
2732 | msegmentptr ss = (m->top == 0)? 0 : segment_holding(m, (char*)m->top); |
2824 | size_t asize = 0; |
2733 | size_t asize = 0; |
2825 | ACQUIRE_MORECORE_LOCK(); |
2734 | ACQUIRE_MORECORE_LOCK(); |
2826 | 2735 | ||
2827 | if (ss == 0) { /* First time through or recovery */ |
2736 | if (ss == 0) { /* First time through or recovery */ |
2828 | char* base = (char*)CALL_MORECORE(0); |
2737 | char* base = (char*)CALL_MORECORE(0); |
2829 | if (base != CMFAIL) { |
2738 | if (base != CMFAIL) { |
2830 | asize = granularity_align(nb + TOP_FOOT_SIZE + SIZE_T_ONE); |
2739 | asize = granularity_align(nb + TOP_FOOT_SIZE + SIZE_T_ONE); |
2831 | /* Adjust to end on a page boundary */ |
2740 | /* Adjust to end on a page boundary */ |
2832 | if (!is_page_aligned(base)) |
2741 | if (!is_page_aligned(base)) |
2833 | asize += (page_align((size_t)base) - (size_t)base); |
2742 | asize += (page_align((size_t)base) - (size_t)base); |
2834 | /* Can't call MORECORE if size is negative when treated as signed */ |
2743 | /* Can't call MORECORE if size is negative when treated as signed */ |
2835 | if (asize < HALF_MAX_SIZE_T && |
2744 | if (asize < HALF_MAX_SIZE_T && |
2836 | (br = (char*)(CALL_MORECORE(asize))) == base) { |
2745 | (br = (char*)(CALL_MORECORE(asize))) == base) { |
2837 | tbase = base; |
2746 | tbase = base; |
2838 | tsize = asize; |
2747 | tsize = asize; |
2839 | } |
2748 | } |
2840 | } |
2749 | } |
2841 | } |
2750 | } |
2842 | else { |
2751 | else { |
2843 | /* Subtract out existing available top space from MORECORE request. */ |
2752 | /* Subtract out existing available top space from MORECORE request. */ |
2844 | asize = granularity_align(nb - m->topsize + TOP_FOOT_SIZE + SIZE_T_ONE); |
2753 | asize = granularity_align(nb - m->topsize + TOP_FOOT_SIZE + SIZE_T_ONE); |
2845 | /* Use mem here only if it did continuously extend old space */ |
2754 | /* Use mem here only if it did continuously extend old space */ |
2846 | if (asize < HALF_MAX_SIZE_T && |
2755 | if (asize < HALF_MAX_SIZE_T && |
2847 | (br = (char*)(CALL_MORECORE(asize))) == ss->base+ss->size) { |
2756 | (br = (char*)(CALL_MORECORE(asize))) == ss->base+ss->size) { |
2848 | tbase = br; |
2757 | tbase = br; |
2849 | tsize = asize; |
2758 | tsize = asize; |
2850 | } |
2759 | } |
2851 | } |
2760 | } |
2852 | 2761 | ||
2853 | if (tbase == CMFAIL) { /* Cope with partial failure */ |
2762 | if (tbase == CMFAIL) { /* Cope with partial failure */ |
2854 | if (br != CMFAIL) { /* Try to use/extend the space we did get */ |
2763 | if (br != CMFAIL) { /* Try to use/extend the space we did get */ |
2855 | if (asize < HALF_MAX_SIZE_T && |
2764 | if (asize < HALF_MAX_SIZE_T && |
2856 | asize < nb + TOP_FOOT_SIZE + SIZE_T_ONE) { |
2765 | asize < nb + TOP_FOOT_SIZE + SIZE_T_ONE) { |
2857 | size_t esize = granularity_align(nb + TOP_FOOT_SIZE + SIZE_T_ONE - asize); |
2766 | size_t esize = granularity_align(nb + TOP_FOOT_SIZE + SIZE_T_ONE - asize); |
2858 | if (esize < HALF_MAX_SIZE_T) { |
2767 | if (esize < HALF_MAX_SIZE_T) { |
2859 | char* end = (char*)CALL_MORECORE(esize); |
2768 | char* end = (char*)CALL_MORECORE(esize); |
2860 | if (end != CMFAIL) |
2769 | if (end != CMFAIL) |
2861 | asize += esize; |
2770 | asize += esize; |
2862 | else { /* Can't use; try to release */ |
2771 | else { /* Can't use; try to release */ |
2863 | CALL_MORECORE(-asize); |
2772 | CALL_MORECORE(-asize); |
2864 | br = CMFAIL; |
2773 | br = CMFAIL; |
2865 | } |
2774 | } |
2866 | } |
2775 | } |
2867 | } |
2776 | } |
2868 | } |
2777 | } |
2869 | if (br != CMFAIL) { /* Use the space we did get */ |
2778 | if (br != CMFAIL) { /* Use the space we did get */ |
2870 | tbase = br; |
2779 | tbase = br; |
2871 | tsize = asize; |
2780 | tsize = asize; |
2872 | } |
2781 | } |
2873 | else |
2782 | else |
2874 | disable_contiguous(m); /* Don't try contiguous path in the future */ |
2783 | disable_contiguous(m); /* Don't try contiguous path in the future */ |
2875 | } |
2784 | } |
2876 | 2785 | ||
2877 | RELEASE_MORECORE_LOCK(); |
2786 | RELEASE_MORECORE_LOCK(); |
2878 | } |
2787 | } |
2879 | 2788 | ||
2880 | if (HAVE_MMAP && tbase == CMFAIL) { /* Try MMAP */ |
2789 | if (HAVE_MMAP && tbase == CMFAIL) { /* Try MMAP */ |
2881 | size_t req = nb + TOP_FOOT_SIZE + SIZE_T_ONE; |
2790 | size_t req = nb + TOP_FOOT_SIZE + SIZE_T_ONE; |
2882 | size_t rsize = granularity_align(req); |
2791 | size_t rsize = granularity_align(req); |
2883 | if (rsize > nb) { /* Fail if wraps around zero */ |
2792 | if (rsize > nb) { /* Fail if wraps around zero */ |
2884 | char* mp = (char*)(CALL_MMAP(rsize)); |
2793 | char* mp = (char*)(CALL_MMAP(rsize)); |
2885 | if (mp != CMFAIL) { |
2794 | if (mp != CMFAIL) { |
2886 | tbase = mp; |
2795 | tbase = mp; |
2887 | tsize = rsize; |
2796 | tsize = rsize; |
2888 | mmap_flag = IS_MMAPPED_BIT; |
2797 | mmap_flag = IS_MMAPPED_BIT; |
2889 | } |
2798 | } |
2890 | } |
2799 | } |
2891 | } |
2800 | } |
2892 | 2801 | ||
2893 | if (HAVE_MORECORE && tbase == CMFAIL) { /* Try noncontiguous MORECORE */ |
2802 | if (HAVE_MORECORE && tbase == CMFAIL) { /* Try noncontiguous MORECORE */ |
2894 | size_t asize = granularity_align(nb + TOP_FOOT_SIZE + SIZE_T_ONE); |
2803 | size_t asize = granularity_align(nb + TOP_FOOT_SIZE + SIZE_T_ONE); |
2895 | if (asize < HALF_MAX_SIZE_T) { |
2804 | if (asize < HALF_MAX_SIZE_T) { |
2896 | char* br = CMFAIL; |
2805 | char* br = CMFAIL; |
2897 | char* end = CMFAIL; |
2806 | char* end = CMFAIL; |
2898 | ACQUIRE_MORECORE_LOCK(); |
2807 | ACQUIRE_MORECORE_LOCK(); |
2899 | br = (char*)(CALL_MORECORE(asize)); |
2808 | br = (char*)(CALL_MORECORE(asize)); |
2900 | end = (char*)(CALL_MORECORE(0)); |
2809 | end = (char*)(CALL_MORECORE(0)); |
2901 | RELEASE_MORECORE_LOCK(); |
2810 | RELEASE_MORECORE_LOCK(); |
2902 | if (br != CMFAIL && end != CMFAIL && br < end) { |
2811 | if (br != CMFAIL && end != CMFAIL && br < end) { |
2903 | size_t ssize = end - br; |
2812 | size_t ssize = end - br; |
2904 | if (ssize > nb + TOP_FOOT_SIZE) { |
2813 | if (ssize > nb + TOP_FOOT_SIZE) { |
2905 | tbase = br; |
2814 | tbase = br; |
2906 | tsize = ssize; |
2815 | tsize = ssize; |
2907 | } |
2816 | } |
2908 | } |
2817 | } |
2909 | } |
2818 | } |
2910 | } |
2819 | } |
2911 | 2820 | ||
2912 | if (tbase != CMFAIL) { |
2821 | if (tbase != CMFAIL) { |
2913 | 2822 | ||
2914 | if ((m->footprint += tsize) > m->max_footprint) |
2823 | if ((m->footprint += tsize) > m->max_footprint) |
2915 | m->max_footprint = m->footprint; |
2824 | m->max_footprint = m->footprint; |
2916 | 2825 | ||
2917 | if (!is_initialized(m)) { /* first-time initialization */ |
2826 | if (!is_initialized(m)) { /* first-time initialization */ |
2918 | m->seg.base = m->least_addr = tbase; |
2827 | m->seg.base = m->least_addr = tbase; |
2919 | m->seg.size = tsize; |
2828 | m->seg.size = tsize; |
2920 | m->seg.sflags = mmap_flag; |
2829 | m->seg.sflags = mmap_flag; |
2921 | m->magic = mparams.magic; |
2830 | m->magic = mparams.magic; |
2922 | init_bins(m); |
2831 | init_bins(m); |
2923 | if (is_global(m)) |
2832 | if (is_global(m)) |
2924 | init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE); |
2833 | init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE); |
2925 | else { |
2834 | else { |
2926 | /* Offset top by embedded malloc_state */ |
2835 | /* Offset top by embedded malloc_state */ |
2927 | mchunkptr mn = next_chunk(mem2chunk(m)); |
2836 | mchunkptr mn = next_chunk(mem2chunk(m)); |
2928 | init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) -TOP_FOOT_SIZE); |
2837 | init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) -TOP_FOOT_SIZE); |
2929 | } |
2838 | } |
2930 | } |
2839 | } |
2931 | 2840 | ||
2932 | else { |
2841 | else { |
2933 | /* Try to merge with an existing segment */ |
2842 | /* Try to merge with an existing segment */ |
2934 | msegmentptr sp = &m->seg; |
2843 | msegmentptr sp = &m->seg; |
2935 | while (sp != 0 && tbase != sp->base + sp->size) |
2844 | while (sp != 0 && tbase != sp->base + sp->size) |
2936 | sp = sp->next; |
2845 | sp = sp->next; |
2937 | if (sp != 0 && |
2846 | if (sp != 0 && |
2938 | !is_extern_segment(sp) && |
2847 | !is_extern_segment(sp) && |
2939 | (sp->sflags & IS_MMAPPED_BIT) == mmap_flag && |
2848 | (sp->sflags & IS_MMAPPED_BIT) == mmap_flag && |
2940 | segment_holds(sp, m->top)) { /* append */ |
2849 | segment_holds(sp, m->top)) { /* append */ |
2941 | sp->size += tsize; |
2850 | sp->size += tsize; |
2942 | init_top(m, m->top, m->topsize + tsize); |
2851 | init_top(m, m->top, m->topsize + tsize); |
2943 | } |
2852 | } |
2944 | else { |
2853 | else { |
2945 | if (tbase < m->least_addr) |
2854 | if (tbase < m->least_addr) |
2946 | m->least_addr = tbase; |
2855 | m->least_addr = tbase; |
2947 | sp = &m->seg; |
2856 | sp = &m->seg; |
2948 | while (sp != 0 && sp->base != tbase + tsize) |
2857 | while (sp != 0 && sp->base != tbase + tsize) |
2949 | sp = sp->next; |
2858 | sp = sp->next; |
2950 | if (sp != 0 && |
2859 | if (sp != 0 && |
2951 | !is_extern_segment(sp) && |
2860 | !is_extern_segment(sp) && |
2952 | (sp->sflags & IS_MMAPPED_BIT) == mmap_flag) { |
2861 | (sp->sflags & IS_MMAPPED_BIT) == mmap_flag) { |
2953 | char* oldbase = sp->base; |
2862 | char* oldbase = sp->base; |
2954 | sp->base = tbase; |
2863 | sp->base = tbase; |
2955 | sp->size += tsize; |
2864 | sp->size += tsize; |
2956 | return prepend_alloc(m, tbase, oldbase, nb); |
2865 | return prepend_alloc(m, tbase, oldbase, nb); |
2957 | } |
2866 | } |
2958 | else |
2867 | else |
2959 | add_segment(m, tbase, tsize, mmap_flag); |
2868 | add_segment(m, tbase, tsize, mmap_flag); |
2960 | } |
2869 | } |
2961 | } |
2870 | } |
2962 | 2871 | ||
2963 | if (nb < m->topsize) { /* Allocate from new or extended top space */ |
2872 | if (nb < m->topsize) { /* Allocate from new or extended top space */ |
2964 | size_t rsize = m->topsize -= nb; |
2873 | size_t rsize = m->topsize -= nb; |
2965 | mchunkptr p = m->top; |
2874 | mchunkptr p = m->top; |
2966 | mchunkptr r = m->top = chunk_plus_offset(p, nb); |
2875 | mchunkptr r = m->top = chunk_plus_offset(p, nb); |
2967 | r->head = rsize | PINUSE_BIT; |
2876 | r->head = rsize | PINUSE_BIT; |
2968 | set_size_and_pinuse_of_inuse_chunk(m, p, nb); |
2877 | set_size_and_pinuse_of_inuse_chunk(m, p, nb); |
2969 | check_top_chunk(m, m->top); |
2878 | check_top_chunk(m, m->top); |
2970 | check_malloced_chunk(m, chunk2mem(p), nb); |
2879 | check_malloced_chunk(m, chunk2mem(p), nb); |
2971 | return chunk2mem(p); |
2880 | return chunk2mem(p); |
2972 | } |
2881 | } |
2973 | } |
2882 | } |
2974 | 2883 | ||
2975 | MALLOC_FAILURE_ACTION; |
2884 | MALLOC_FAILURE_ACTION; |
2976 | return 0; |
2885 | return 0; |
2977 | } |
2886 | } |
2978 | 2887 | ||
2979 | /* ----------------------- system deallocation -------------------------- */ |
2888 | /* ----------------------- system deallocation -------------------------- */ |
2980 | 2889 | ||
2981 | /* Unmap and unlink any mmapped segments that don't contain used chunks */ |
2890 | /* Unmap and unlink any mmapped segments that don't contain used chunks */ |
2982 | static size_t release_unused_segments(mstate m) { |
2891 | static size_t release_unused_segments(mstate m) { |
2983 | size_t released = 0; |
2892 | size_t released = 0; |
2984 | msegmentptr pred = &m->seg; |
2893 | msegmentptr pred = &m->seg; |
2985 | msegmentptr sp = pred->next; |
2894 | msegmentptr sp = pred->next; |
2986 | while (sp != 0) { |
2895 | while (sp != 0) { |
2987 | char* base = sp->base; |
2896 | char* base = sp->base; |
2988 | size_t size = sp->size; |
2897 | size_t size = sp->size; |
2989 | msegmentptr next = sp->next; |
2898 | msegmentptr next = sp->next; |
2990 | if (is_mmapped_segment(sp) && !is_extern_segment(sp)) { |
2899 | if (is_mmapped_segment(sp) && !is_extern_segment(sp)) { |
2991 | mchunkptr p = align_as_chunk(base); |
2900 | mchunkptr p = align_as_chunk(base); |
2992 | size_t psize = chunksize(p); |
2901 | size_t psize = chunksize(p); |
2993 | /* Can unmap if first chunk holds entire segment and not pinned */ |
2902 | /* Can unmap if first chunk holds entire segment and not pinned */ |
2994 | if (!cinuse(p) && (char*)p + psize >= base + size - TOP_FOOT_SIZE) { |
2903 | if (!cinuse(p) && (char*)p + psize >= base + size - TOP_FOOT_SIZE) { |
2995 | tchunkptr tp = (tchunkptr)p; |
2904 | tchunkptr tp = (tchunkptr)p; |
2996 | assert(segment_holds(sp, (char*)sp)); |
2905 | assert(segment_holds(sp, (char*)sp)); |
2997 | if (p == m->dv) { |
2906 | if (p == m->dv) { |
2998 | m->dv = 0; |
2907 | m->dv = 0; |
2999 | m->dvsize = 0; |
2908 | m->dvsize = 0; |
3000 | } |
2909 | } |
3001 | else { |
2910 | else { |
3002 | unlink_large_chunk(m, tp); |
2911 | unlink_large_chunk(m, tp); |
3003 | } |
2912 | } |
3004 | if (CALL_MUNMAP(base, size) == 0) { |
2913 | if (CALL_MUNMAP(base, size) == 0) { |
3005 | released += size; |
2914 | released += size; |
3006 | m->footprint -= size; |
2915 | m->footprint -= size; |
3007 | /* unlink obsoleted record */ |
2916 | /* unlink obsoleted record */ |
3008 | sp = pred; |
2917 | sp = pred; |
3009 | sp->next = next; |
2918 | sp->next = next; |
3010 | } |
2919 | } |
3011 | else { /* back out if cannot unmap */ |
2920 | else { /* back out if cannot unmap */ |
3012 | insert_large_chunk(m, tp, psize); |
2921 | insert_large_chunk(m, tp, psize); |
3013 | } |
2922 | } |
3014 | } |
2923 | } |
3015 | } |
2924 | } |
3016 | pred = sp; |
2925 | pred = sp; |
3017 | sp = next; |
2926 | sp = next; |
3018 | } |
2927 | } |
3019 | return released; |
2928 | return released; |
3020 | } |
2929 | } |
3021 | 2930 | ||
3022 | static int sys_trim(mstate m, size_t pad) { |
2931 | static int sys_trim(mstate m, size_t pad) { |
3023 | size_t released = 0; |
2932 | size_t released = 0; |
3024 | if (pad < MAX_REQUEST && is_initialized(m)) { |
2933 | if (pad < MAX_REQUEST && is_initialized(m)) { |
3025 | pad += TOP_FOOT_SIZE; /* ensure enough room for segment overhead */ |
2934 | pad += TOP_FOOT_SIZE; /* ensure enough room for segment overhead */ |
3026 | 2935 | ||
3027 | if (m->topsize > pad) { |
2936 | if (m->topsize > pad) { |
3028 | /* Shrink top space in granularity-size units, keeping at least one */ |
2937 | /* Shrink top space in granularity-size units, keeping at least one */ |
3029 | size_t unit = mparams.granularity; |
2938 | size_t unit = mparams.granularity; |
3030 | size_t extra = ((m->topsize - pad + (unit - SIZE_T_ONE)) / unit - |
2939 | size_t extra = ((m->topsize - pad + (unit - SIZE_T_ONE)) / unit - |
3031 | SIZE_T_ONE) * unit; |
2940 | SIZE_T_ONE) * unit; |
3032 | msegmentptr sp = segment_holding(m, (char*)m->top); |
2941 | msegmentptr sp = segment_holding(m, (char*)m->top); |
3033 | 2942 | ||
3034 | if (!is_extern_segment(sp)) { |
2943 | if (!is_extern_segment(sp)) { |
3035 | if (is_mmapped_segment(sp)) { |
2944 | if (is_mmapped_segment(sp)) { |
3036 | if (HAVE_MMAP && |
2945 | if (HAVE_MMAP && |
3037 | sp->size >= extra && |
2946 | sp->size >= extra && |
3038 | !has_segment_link(m, sp)) { /* can't shrink if pinned */ |
2947 | !has_segment_link(m, sp)) { /* can't shrink if pinned */ |
3039 | size_t newsize = sp->size - extra; |
2948 | size_t newsize = sp->size - extra; |
3040 | /* Prefer mremap, fall back to munmap */ |
2949 | /* Prefer mremap, fall back to munmap */ |
3041 | if ((CALL_MREMAP(sp->base, sp->size, newsize, 0) != MFAIL) || |
2950 | if ((CALL_MREMAP(sp->base, sp->size, newsize, 0) != MFAIL) || |
3042 | (CALL_MUNMAP(sp->base + newsize, extra) == 0)) { |
2951 | (CALL_MUNMAP(sp->base + newsize, extra) == 0)) { |
3043 | released = extra; |
2952 | released = extra; |
3044 | } |
2953 | } |
3045 | } |
2954 | } |
3046 | } |
2955 | } |
3047 | else if (HAVE_MORECORE) { |
2956 | else if (HAVE_MORECORE) { |
3048 | if (extra >= HALF_MAX_SIZE_T) /* Avoid wrapping negative */ |
2957 | if (extra >= HALF_MAX_SIZE_T) /* Avoid wrapping negative */ |
3049 | extra = (HALF_MAX_SIZE_T) + SIZE_T_ONE - unit; |
2958 | extra = (HALF_MAX_SIZE_T) + SIZE_T_ONE - unit; |
3050 | ACQUIRE_MORECORE_LOCK(); |
2959 | ACQUIRE_MORECORE_LOCK(); |
3051 | { |
2960 | { |
3052 | /* Make sure end of memory is where we last set it. */ |
2961 | /* Make sure end of memory is where we last set it. */ |
3053 | char* old_br = (char*)(CALL_MORECORE(0)); |
2962 | char* old_br = (char*)(CALL_MORECORE(0)); |
3054 | if (old_br == sp->base + sp->size) { |
2963 | if (old_br == sp->base + sp->size) { |
3055 | char* rel_br = (char*)(CALL_MORECORE(-extra)); |
2964 | char* rel_br = (char*)(CALL_MORECORE(-extra)); |
3056 | char* new_br = (char*)(CALL_MORECORE(0)); |
2965 | char* new_br = (char*)(CALL_MORECORE(0)); |
3057 | if (rel_br != CMFAIL && new_br < old_br) |
2966 | if (rel_br != CMFAIL && new_br < old_br) |
3058 | released = old_br - new_br; |
2967 | released = old_br - new_br; |
3059 | } |
2968 | } |
3060 | } |
2969 | } |
3061 | RELEASE_MORECORE_LOCK(); |
2970 | RELEASE_MORECORE_LOCK(); |
3062 | } |
2971 | } |
3063 | } |
2972 | } |
3064 | 2973 | ||
3065 | if (released != 0) { |
2974 | if (released != 0) { |
3066 | sp->size -= released; |
2975 | sp->size -= released; |
3067 | m->footprint -= released; |
2976 | m->footprint -= released; |
3068 | init_top(m, m->top, m->topsize - released); |
2977 | init_top(m, m->top, m->topsize - released); |
3069 | check_top_chunk(m, m->top); |
2978 | check_top_chunk(m, m->top); |
3070 | } |
2979 | } |
3071 | } |
2980 | } |
3072 | 2981 | ||
3073 | /* Unmap any unused mmapped segments */ |
2982 | /* Unmap any unused mmapped segments */ |
3074 | if (HAVE_MMAP) |
2983 | if (HAVE_MMAP) |
3075 | released += release_unused_segments(m); |
2984 | released += release_unused_segments(m); |
3076 | 2985 | ||
3077 | /* On failure, disable autotrim to avoid repeated failed future calls */ |
2986 | /* On failure, disable autotrim to avoid repeated failed future calls */ |
3078 | if (released == 0) |
2987 | if (released == 0) |
3079 | m->trim_check = MAX_SIZE_T; |
2988 | m->trim_check = MAX_SIZE_T; |
3080 | } |
2989 | } |
3081 | 2990 | ||
3082 | return (released != 0)? 1 : 0; |
2991 | return (released != 0)? 1 : 0; |
3083 | } |
2992 | } |
3084 | 2993 | ||
3085 | /* ---------------------------- malloc support --------------------------- */ |
2994 | /* ---------------------------- malloc support --------------------------- */ |
3086 | 2995 | ||
3087 | /* allocate a large request from the best fitting chunk in a treebin */ |
2996 | /* allocate a large request from the best fitting chunk in a treebin */ |
3088 | static void* tmalloc_large(mstate m, size_t nb) { |
2997 | static void* tmalloc_large(mstate m, size_t nb) { |
3089 | tchunkptr v = 0; |
2998 | tchunkptr v = 0; |
3090 | size_t rsize = -nb; /* Unsigned negation */ |
2999 | size_t rsize = -nb; /* Unsigned negation */ |
3091 | tchunkptr t; |
3000 | tchunkptr t; |
3092 | bindex_t idx; |
3001 | bindex_t idx; |
3093 | compute_tree_index(nb, idx); |
3002 | compute_tree_index(nb, idx); |
3094 | 3003 | ||
3095 | if ((t = *treebin_at(m, idx)) != 0) { |
3004 | if ((t = *treebin_at(m, idx)) != 0) { |
3096 | /* Traverse tree for this bin looking for node with size == nb */ |
3005 | /* Traverse tree for this bin looking for node with size == nb */ |
3097 | size_t sizebits = nb << leftshift_for_tree_index(idx); |
3006 | size_t sizebits = nb << leftshift_for_tree_index(idx); |
3098 | tchunkptr rst = 0; /* The deepest untaken right subtree */ |
3007 | tchunkptr rst = 0; /* The deepest untaken right subtree */ |
3099 | for (;;) { |
3008 | for (;;) { |
3100 | tchunkptr rt; |
3009 | tchunkptr rt; |
3101 | size_t trem = chunksize(t) - nb; |
3010 | size_t trem = chunksize(t) - nb; |
3102 | if (trem < rsize) { |
3011 | if (trem < rsize) { |
3103 | v = t; |
3012 | v = t; |
3104 | if ((rsize = trem) == 0) |
3013 | if ((rsize = trem) == 0) |
3105 | break; |
3014 | break; |
3106 | } |
3015 | } |
3107 | rt = t->child[1]; |
3016 | rt = t->child[1]; |
3108 | t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]; |
3017 | t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]; |
3109 | if (rt != 0 && rt != t) |
3018 | if (rt != 0 && rt != t) |
3110 | rst = rt; |
3019 | rst = rt; |
3111 | if (t == 0) { |
3020 | if (t == 0) { |
3112 | t = rst; /* set t to least subtree holding sizes > nb */ |
3021 | t = rst; /* set t to least subtree holding sizes > nb */ |
3113 | break; |
3022 | break; |
3114 | } |
3023 | } |
3115 | sizebits <<= 1; |
3024 | sizebits <<= 1; |
3116 | } |
3025 | } |
3117 | } |
3026 | } |
3118 | 3027 | ||
3119 | if (t == 0 && v == 0) { /* set t to root of next non-empty treebin */ |
3028 | if (t == 0 && v == 0) { /* set t to root of next non-empty treebin */ |
3120 | binmap_t leftbits = left_bits(idx2bit(idx)) & m->treemap; |
3029 | binmap_t leftbits = left_bits(idx2bit(idx)) & m->treemap; |
3121 | if (leftbits != 0) { |
3030 | if (leftbits != 0) { |
3122 | bindex_t i; |
3031 | bindex_t i; |
3123 | binmap_t leastbit = least_bit(leftbits); |
3032 | binmap_t leastbit = least_bit(leftbits); |
3124 | compute_bit2idx(leastbit, i); |
3033 | compute_bit2idx(leastbit, i); |
3125 | t = *treebin_at(m, i); |
3034 | t = *treebin_at(m, i); |
3126 | } |
3035 | } |
3127 | } |
3036 | } |
3128 | 3037 | ||
3129 | while (t != 0) { /* find smallest of tree or subtree */ |
3038 | while (t != 0) { /* find smallest of tree or subtree */ |
3130 | size_t trem = chunksize(t) - nb; |
3039 | size_t trem = chunksize(t) - nb; |
3131 | if (trem < rsize) { |
3040 | if (trem < rsize) { |
3132 | rsize = trem; |
3041 | rsize = trem; |
3133 | v = t; |
3042 | v = t; |
3134 | } |
3043 | } |
3135 | t = leftmost_child(t); |
3044 | t = leftmost_child(t); |
3136 | } |
3045 | } |
3137 | 3046 | ||
3138 | /* If dv is a better fit, return 0 so malloc will use it */ |
3047 | /* If dv is a better fit, return 0 so malloc will use it */ |
3139 | if (v != 0 && rsize < (size_t)(m->dvsize - nb)) { |
3048 | if (v != 0 && rsize < (size_t)(m->dvsize - nb)) { |
3140 | if (RTCHECK(ok_address(m, v))) { /* split */ |
3049 | if (RTCHECK(ok_address(m, v))) { /* split */ |
3141 | mchunkptr r = chunk_plus_offset(v, nb); |
3050 | mchunkptr r = chunk_plus_offset(v, nb); |
3142 | assert(chunksize(v) == rsize + nb); |
3051 | assert(chunksize(v) == rsize + nb); |
3143 | if (RTCHECK(ok_next(v, r))) { |
3052 | if (RTCHECK(ok_next(v, r))) { |
3144 | unlink_large_chunk(m, v); |
3053 | unlink_large_chunk(m, v); |
3145 | if (rsize < MIN_CHUNK_SIZE) |
3054 | if (rsize < MIN_CHUNK_SIZE) |
3146 | set_inuse_and_pinuse(m, v, (rsize + nb)); |
3055 | set_inuse_and_pinuse(m, v, (rsize + nb)); |
3147 | else { |
3056 | else { |
3148 | set_size_and_pinuse_of_inuse_chunk(m, v, nb); |
3057 | set_size_and_pinuse_of_inuse_chunk(m, v, nb); |
3149 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3058 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3150 | insert_chunk(m, r, rsize); |
3059 | insert_chunk(m, r, rsize); |
3151 | } |
3060 | } |
3152 | return chunk2mem(v); |
3061 | return chunk2mem(v); |
3153 | } |
3062 | } |
3154 | } |
3063 | } |
3155 | CORRUPTION_ERROR_ACTION(m); |
3064 | CORRUPTION_ERROR_ACTION(m); |
3156 | } |
3065 | } |
3157 | return 0; |
3066 | return 0; |
3158 | } |
3067 | } |
3159 | 3068 | ||
3160 | /* allocate a small request from the best fitting chunk in a treebin */ |
3069 | /* allocate a small request from the best fitting chunk in a treebin */ |
3161 | static void* tmalloc_small(mstate m, size_t nb) { |
3070 | static void* tmalloc_small(mstate m, size_t nb) { |
3162 | tchunkptr t, v; |
3071 | tchunkptr t, v; |
3163 | size_t rsize; |
3072 | size_t rsize; |
3164 | bindex_t i; |
3073 | bindex_t i; |
3165 | binmap_t leastbit = least_bit(m->treemap); |
3074 | binmap_t leastbit = least_bit(m->treemap); |
3166 | compute_bit2idx(leastbit, i); |
3075 | compute_bit2idx(leastbit, i); |
3167 | 3076 | ||
3168 | v = t = *treebin_at(m, i); |
3077 | v = t = *treebin_at(m, i); |
3169 | rsize = chunksize(t) - nb; |
3078 | rsize = chunksize(t) - nb; |
3170 | 3079 | ||
3171 | while ((t = leftmost_child(t)) != 0) { |
3080 | while ((t = leftmost_child(t)) != 0) { |
3172 | size_t trem = chunksize(t) - nb; |
3081 | size_t trem = chunksize(t) - nb; |
3173 | if (trem < rsize) { |
3082 | if (trem < rsize) { |
3174 | rsize = trem; |
3083 | rsize = trem; |
3175 | v = t; |
3084 | v = t; |
3176 | } |
3085 | } |
3177 | } |
3086 | } |
3178 | 3087 | ||
3179 | if (RTCHECK(ok_address(m, v))) { |
3088 | if (RTCHECK(ok_address(m, v))) { |
3180 | mchunkptr r = chunk_plus_offset(v, nb); |
3089 | mchunkptr r = chunk_plus_offset(v, nb); |
3181 | assert(chunksize(v) == rsize + nb); |
3090 | assert(chunksize(v) == rsize + nb); |
3182 | if (RTCHECK(ok_next(v, r))) { |
3091 | if (RTCHECK(ok_next(v, r))) { |
3183 | unlink_large_chunk(m, v); |
3092 | unlink_large_chunk(m, v); |
3184 | if (rsize < MIN_CHUNK_SIZE) |
3093 | if (rsize < MIN_CHUNK_SIZE) |
3185 | set_inuse_and_pinuse(m, v, (rsize + nb)); |
3094 | set_inuse_and_pinuse(m, v, (rsize + nb)); |
3186 | else { |
3095 | else { |
3187 | set_size_and_pinuse_of_inuse_chunk(m, v, nb); |
3096 | set_size_and_pinuse_of_inuse_chunk(m, v, nb); |
3188 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3097 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3189 | replace_dv(m, r, rsize); |
3098 | replace_dv(m, r, rsize); |
3190 | } |
3099 | } |
3191 | return chunk2mem(v); |
3100 | return chunk2mem(v); |
3192 | } |
3101 | } |
3193 | } |
3102 | } |
3194 | 3103 | ||
3195 | CORRUPTION_ERROR_ACTION(m); |
3104 | CORRUPTION_ERROR_ACTION(m); |
3196 | return 0; |
3105 | return 0; |
3197 | } |
3106 | } |
3198 | 3107 | ||
3199 | /* --------------------------- realloc support --------------------------- */ |
3108 | /* --------------------------- realloc support --------------------------- */ |
3200 | 3109 | ||
3201 | static void* internal_realloc(mstate m, void* oldmem, size_t bytes) { |
3110 | static void* internal_realloc(mstate m, void* oldmem, size_t bytes) { |
3202 | if (bytes >= MAX_REQUEST) { |
3111 | if (bytes >= MAX_REQUEST) { |
3203 | MALLOC_FAILURE_ACTION; |
3112 | MALLOC_FAILURE_ACTION; |
3204 | return 0; |
3113 | return 0; |
3205 | } |
3114 | } |
3206 | if (!PREACTION(m)) { |
3115 | if (!PREACTION(m)) { |
3207 | mchunkptr oldp = mem2chunk(oldmem); |
3116 | mchunkptr oldp = mem2chunk(oldmem); |
3208 | size_t oldsize = chunksize(oldp); |
3117 | size_t oldsize = chunksize(oldp); |
3209 | mchunkptr next = chunk_plus_offset(oldp, oldsize); |
3118 | mchunkptr next = chunk_plus_offset(oldp, oldsize); |
3210 | mchunkptr newp = 0; |
3119 | mchunkptr newp = 0; |
3211 | void* extra = 0; |
3120 | void* extra = 0; |
3212 | 3121 | ||
3213 | /* Try to either shrink or extend into top. Else malloc-copy-free */ |
3122 | /* Try to either shrink or extend into top. Else malloc-copy-free */ |
3214 | 3123 | ||
3215 | if (RTCHECK(ok_address(m, oldp) && ok_cinuse(oldp) && |
3124 | if (RTCHECK(ok_address(m, oldp) && ok_cinuse(oldp) && |
3216 | ok_next(oldp, next) && ok_pinuse(next))) { |
3125 | ok_next(oldp, next) && ok_pinuse(next))) { |
3217 | size_t nb = request2size(bytes); |
3126 | size_t nb = request2size(bytes); |
3218 | if (is_mmapped(oldp)) |
3127 | if (is_mmapped(oldp)) |
3219 | newp = mmap_resize(m, oldp, nb); |
3128 | newp = mmap_resize(m, oldp, nb); |
3220 | else if (oldsize >= nb) { /* already big enough */ |
3129 | else if (oldsize >= nb) { /* already big enough */ |
3221 | size_t rsize = oldsize - nb; |
3130 | size_t rsize = oldsize - nb; |
3222 | newp = oldp; |
3131 | newp = oldp; |
3223 | if (rsize >= MIN_CHUNK_SIZE) { |
3132 | if (rsize >= MIN_CHUNK_SIZE) { |
3224 | mchunkptr remainder = chunk_plus_offset(newp, nb); |
3133 | mchunkptr remainder = chunk_plus_offset(newp, nb); |
3225 | set_inuse(m, newp, nb); |
3134 | set_inuse(m, newp, nb); |
3226 | set_inuse(m, remainder, rsize); |
3135 | set_inuse(m, remainder, rsize); |
3227 | extra = chunk2mem(remainder); |
3136 | extra = chunk2mem(remainder); |
3228 | } |
3137 | } |
3229 | } |
3138 | } |
3230 | else if (next == m->top && oldsize + m->topsize > nb) { |
3139 | else if (next == m->top && oldsize + m->topsize > nb) { |
3231 | /* Expand into top */ |
3140 | /* Expand into top */ |
3232 | size_t newsize = oldsize + m->topsize; |
3141 | size_t newsize = oldsize + m->topsize; |
3233 | size_t newtopsize = newsize - nb; |
3142 | size_t newtopsize = newsize - nb; |
3234 | mchunkptr newtop = chunk_plus_offset(oldp, nb); |
3143 | mchunkptr newtop = chunk_plus_offset(oldp, nb); |
3235 | set_inuse(m, oldp, nb); |
3144 | set_inuse(m, oldp, nb); |
3236 | newtop->head = newtopsize |PINUSE_BIT; |
3145 | newtop->head = newtopsize |PINUSE_BIT; |
3237 | m->top = newtop; |
3146 | m->top = newtop; |
3238 | m->topsize = newtopsize; |
3147 | m->topsize = newtopsize; |
3239 | newp = oldp; |
3148 | newp = oldp; |
3240 | } |
3149 | } |
3241 | } |
3150 | } |
3242 | else { |
3151 | else { |
3243 | USAGE_ERROR_ACTION(m, oldmem); |
3152 | USAGE_ERROR_ACTION(m, oldmem); |
3244 | POSTACTION(m); |
3153 | POSTACTION(m); |
3245 | return 0; |
3154 | return 0; |
3246 | } |
3155 | } |
3247 | 3156 | ||
3248 | POSTACTION(m); |
3157 | POSTACTION(m); |
3249 | 3158 | ||
3250 | if (newp != 0) { |
3159 | if (newp != 0) { |
3251 | if (extra != 0) { |
3160 | if (extra != 0) { |
3252 | internal_free(m, extra); |
3161 | internal_free(m, extra); |
3253 | } |
3162 | } |
3254 | check_inuse_chunk(m, newp); |
3163 | check_inuse_chunk(m, newp); |
3255 | return chunk2mem(newp); |
3164 | return chunk2mem(newp); |
3256 | } |
3165 | } |
3257 | else { |
3166 | else { |
3258 | void* newmem = internal_malloc(m, bytes); |
3167 | void* newmem = internal_malloc(m, bytes); |
3259 | if (newmem != 0) { |
3168 | if (newmem != 0) { |
3260 | size_t oc = oldsize - overhead_for(oldp); |
3169 | size_t oc = oldsize - overhead_for(oldp); |
3261 | memcpy(newmem, oldmem, (oc < bytes)? oc : bytes); |
3170 | memcpy(newmem, oldmem, (oc < bytes)? oc : bytes); |
3262 | internal_free(m, oldmem); |
3171 | internal_free(m, oldmem); |
3263 | } |
3172 | } |
3264 | return newmem; |
3173 | return newmem; |
3265 | } |
3174 | } |
3266 | } |
3175 | } |
3267 | return 0; |
3176 | return 0; |
3268 | } |
3177 | } |
3269 | 3178 | ||
3270 | /* --------------------------- memalign support -------------------------- */ |
3179 | /* --------------------------- memalign support -------------------------- */ |
3271 | 3180 | ||
3272 | static void* internal_memalign(mstate m, size_t alignment, size_t bytes) { |
3181 | static void* internal_memalign(mstate m, size_t alignment, size_t bytes) { |
3273 | if (alignment <= MALLOC_ALIGNMENT) /* Can just use malloc */ |
3182 | if (alignment <= MALLOC_ALIGNMENT) /* Can just use malloc */ |
3274 | return internal_malloc(m, bytes); |
3183 | return internal_malloc(m, bytes); |
3275 | if (alignment < MIN_CHUNK_SIZE) /* must be at least a minimum chunk size */ |
3184 | if (alignment < MIN_CHUNK_SIZE) /* must be at least a minimum chunk size */ |
3276 | alignment = MIN_CHUNK_SIZE; |
3185 | alignment = MIN_CHUNK_SIZE; |
3277 | if ((alignment & (alignment-SIZE_T_ONE)) != 0) {/* Ensure a power of 2 */ |
3186 | if ((alignment & (alignment-SIZE_T_ONE)) != 0) {/* Ensure a power of 2 */ |
3278 | size_t a = MALLOC_ALIGNMENT << 1; |
3187 | size_t a = MALLOC_ALIGNMENT << 1; |
3279 | while (a < alignment) a <<= 1; |
3188 | while (a < alignment) a <<= 1; |
3280 | alignment = a; |
3189 | alignment = a; |
3281 | } |
3190 | } |
3282 | 3191 | ||
3283 | if (bytes >= MAX_REQUEST - alignment) { |
3192 | if (bytes >= MAX_REQUEST - alignment) { |
3284 | if (m != 0) { /* Test isn't needed but avoids compiler warning */ |
3193 | if (m != 0) { /* Test isn't needed but avoids compiler warning */ |
3285 | MALLOC_FAILURE_ACTION; |
3194 | MALLOC_FAILURE_ACTION; |
3286 | } |
3195 | } |
3287 | } |
3196 | } |
3288 | else { |
3197 | else { |
3289 | size_t nb = request2size(bytes); |
3198 | size_t nb = request2size(bytes); |
3290 | size_t req = nb + alignment + MIN_CHUNK_SIZE - CHUNK_OVERHEAD; |
3199 | size_t req = nb + alignment + MIN_CHUNK_SIZE - CHUNK_OVERHEAD; |
3291 | char* mem = (char*)internal_malloc(m, req); |
3200 | char* mem = (char*)internal_malloc(m, req); |
3292 | if (mem != 0) { |
3201 | if (mem != 0) { |
3293 | void* leader = 0; |
3202 | void* leader = 0; |
3294 | void* trailer = 0; |
3203 | void* trailer = 0; |
3295 | mchunkptr p = mem2chunk(mem); |
3204 | mchunkptr p = mem2chunk(mem); |
3296 | 3205 | ||
3297 | if (PREACTION(m)) return 0; |
3206 | if (PREACTION(m)) return 0; |
3298 | if ((((size_t)(mem)) % alignment) != 0) { /* misaligned */ |
3207 | if ((((size_t)(mem)) % alignment) != 0) { /* misaligned */ |
3299 | /* |
3208 | /* |
3300 | Find an aligned spot inside chunk. Since we need to give |
3209 | Find an aligned spot inside chunk. Since we need to give |
3301 | back leading space in a chunk of at least MIN_CHUNK_SIZE, if |
3210 | back leading space in a chunk of at least MIN_CHUNK_SIZE, if |
3302 | the first calculation places us at a spot with less than |
3211 | the first calculation places us at a spot with less than |
3303 | MIN_CHUNK_SIZE leader, we can move to the next aligned spot. |
3212 | MIN_CHUNK_SIZE leader, we can move to the next aligned spot. |
3304 | We've allocated enough total room so that this is always |
3213 | We've allocated enough total room so that this is always |
3305 | possible. |
3214 | possible. |
3306 | */ |
3215 | */ |
3307 | char* br = (char*)mem2chunk((size_t)(((size_t)(mem + |
3216 | char* br = (char*)mem2chunk((size_t)(((size_t)(mem + |
3308 | alignment - |
3217 | alignment - |
3309 | SIZE_T_ONE)) & |
3218 | SIZE_T_ONE)) & |
3310 | -alignment)); |
3219 | -alignment)); |
3311 | char* pos = ((size_t)(br - (char*)(p)) >= MIN_CHUNK_SIZE)? |
3220 | char* pos = ((size_t)(br - (char*)(p)) >= MIN_CHUNK_SIZE)? |
3312 | br : br+alignment; |
3221 | br : br+alignment; |
3313 | mchunkptr newp = (mchunkptr)pos; |
3222 | mchunkptr newp = (mchunkptr)pos; |
3314 | size_t leadsize = pos - (char*)(p); |
3223 | size_t leadsize = pos - (char*)(p); |
3315 | size_t newsize = chunksize(p) - leadsize; |
3224 | size_t newsize = chunksize(p) - leadsize; |
3316 | 3225 | ||
3317 | if (is_mmapped(p)) { /* For mmapped chunks, just adjust offset */ |
3226 | if (is_mmapped(p)) { /* For mmapped chunks, just adjust offset */ |
3318 | newp->prev_foot = p->prev_foot + leadsize; |
3227 | newp->prev_foot = p->prev_foot + leadsize; |
3319 | newp->head = (newsize|CINUSE_BIT); |
3228 | newp->head = (newsize|CINUSE_BIT); |
3320 | } |
3229 | } |
3321 | else { /* Otherwise, give back leader, use the rest */ |
3230 | else { /* Otherwise, give back leader, use the rest */ |
3322 | set_inuse(m, newp, newsize); |
3231 | set_inuse(m, newp, newsize); |
3323 | set_inuse(m, p, leadsize); |
3232 | set_inuse(m, p, leadsize); |
3324 | leader = chunk2mem(p); |
3233 | leader = chunk2mem(p); |
3325 | } |
3234 | } |
3326 | p = newp; |
3235 | p = newp; |
3327 | } |
3236 | } |
3328 | 3237 | ||
3329 | /* Give back spare room at the end */ |
3238 | /* Give back spare room at the end */ |
3330 | if (!is_mmapped(p)) { |
3239 | if (!is_mmapped(p)) { |
3331 | size_t size = chunksize(p); |
3240 | size_t size = chunksize(p); |
3332 | if (size > nb + MIN_CHUNK_SIZE) { |
3241 | if (size > nb + MIN_CHUNK_SIZE) { |
3333 | size_t remainder_size = size - nb; |
3242 | size_t remainder_size = size - nb; |
3334 | mchunkptr remainder = chunk_plus_offset(p, nb); |
3243 | mchunkptr remainder = chunk_plus_offset(p, nb); |
3335 | set_inuse(m, p, nb); |
3244 | set_inuse(m, p, nb); |
3336 | set_inuse(m, remainder, remainder_size); |
3245 | set_inuse(m, remainder, remainder_size); |
3337 | trailer = chunk2mem(remainder); |
3246 | trailer = chunk2mem(remainder); |
3338 | } |
3247 | } |
3339 | } |
3248 | } |
3340 | 3249 | ||
3341 | assert (chunksize(p) >= nb); |
3250 | assert (chunksize(p) >= nb); |
3342 | assert((((size_t)(chunk2mem(p))) % alignment) == 0); |
3251 | assert((((size_t)(chunk2mem(p))) % alignment) == 0); |
3343 | check_inuse_chunk(m, p); |
3252 | check_inuse_chunk(m, p); |
3344 | POSTACTION(m); |
3253 | POSTACTION(m); |
3345 | if (leader != 0) { |
3254 | if (leader != 0) { |
3346 | internal_free(m, leader); |
3255 | internal_free(m, leader); |
3347 | } |
3256 | } |
3348 | if (trailer != 0) { |
3257 | if (trailer != 0) { |
3349 | internal_free(m, trailer); |
3258 | internal_free(m, trailer); |
3350 | } |
3259 | } |
3351 | return chunk2mem(p); |
3260 | return chunk2mem(p); |
3352 | } |
3261 | } |
3353 | } |
3262 | } |
3354 | return 0; |
3263 | return 0; |
3355 | } |
3264 | } |
3356 | 3265 | ||
3357 | /* ------------------------ comalloc/coalloc support --------------------- */ |
3266 | /* ------------------------ comalloc/coalloc support --------------------- */ |
3358 | 3267 | ||
3359 | static void** ialloc(mstate m, |
3268 | static void** ialloc(mstate m, |
3360 | size_t n_elements, |
3269 | size_t n_elements, |
3361 | size_t* sizes, |
3270 | size_t* sizes, |
3362 | int opts, |
3271 | int opts, |
3363 | void* chunks[]) { |
3272 | void* chunks[]) { |
3364 | /* |
3273 | /* |
3365 | This provides common support for independent_X routines, handling |
3274 | This provides common support for independent_X routines, handling |
3366 | all of the combinations that can result. |
3275 | all of the combinations that can result. |
3367 | 3276 | ||
3368 | The opts arg has: |
3277 | The opts arg has: |
3369 | bit 0 set if all elements are same size (using sizes[0]) |
3278 | bit 0 set if all elements are same size (using sizes[0]) |
3370 | bit 1 set if elements should be zeroed |
3279 | bit 1 set if elements should be zeroed |
3371 | */ |
3280 | */ |
3372 | 3281 | ||
3373 | size_t element_size; /* chunksize of each element, if all same */ |
3282 | size_t element_size; /* chunksize of each element, if all same */ |
3374 | size_t contents_size; /* total size of elements */ |
3283 | size_t contents_size; /* total size of elements */ |
3375 | size_t array_size; /* request size of pointer array */ |
3284 | size_t array_size; /* request size of pointer array */ |
3376 | void* mem; /* malloced aggregate space */ |
3285 | void* mem; /* malloced aggregate space */ |
3377 | mchunkptr p; /* corresponding chunk */ |
3286 | mchunkptr p; /* corresponding chunk */ |
3378 | size_t remainder_size; /* remaining bytes while splitting */ |
3287 | size_t remainder_size; /* remaining bytes while splitting */ |
3379 | void** marray; /* either "chunks" or malloced ptr array */ |
3288 | void** marray; /* either "chunks" or malloced ptr array */ |
3380 | mchunkptr array_chunk; /* chunk for malloced ptr array */ |
3289 | mchunkptr array_chunk; /* chunk for malloced ptr array */ |
3381 | flag_t was_enabled; /* to disable mmap */ |
3290 | flag_t was_enabled; /* to disable mmap */ |
3382 | size_t size; |
3291 | size_t size; |
3383 | size_t i; |
3292 | size_t i; |
3384 | 3293 | ||
3385 | /* compute array length, if needed */ |
3294 | /* compute array length, if needed */ |
3386 | if (chunks != 0) { |
3295 | if (chunks != 0) { |
3387 | if (n_elements == 0) |
3296 | if (n_elements == 0) |
3388 | return chunks; /* nothing to do */ |
3297 | return chunks; /* nothing to do */ |
3389 | marray = chunks; |
3298 | marray = chunks; |
3390 | array_size = 0; |
3299 | array_size = 0; |
3391 | } |
3300 | } |
3392 | else { |
3301 | else { |
3393 | /* if empty req, must still return chunk representing empty array */ |
3302 | /* if empty req, must still return chunk representing empty array */ |
3394 | if (n_elements == 0) |
3303 | if (n_elements == 0) |
3395 | return (void**)internal_malloc(m, 0); |
3304 | return (void**)internal_malloc(m, 0); |
3396 | marray = 0; |
3305 | marray = 0; |
3397 | array_size = request2size(n_elements * (sizeof(void*))); |
3306 | array_size = request2size(n_elements * (sizeof(void*))); |
3398 | } |
3307 | } |
3399 | 3308 | ||
3400 | /* compute total element size */ |
3309 | /* compute total element size */ |
3401 | if (opts & 0x1) { /* all-same-size */ |
3310 | if (opts & 0x1) { /* all-same-size */ |
3402 | element_size = request2size(*sizes); |
3311 | element_size = request2size(*sizes); |
3403 | contents_size = n_elements * element_size; |
3312 | contents_size = n_elements * element_size; |
3404 | } |
3313 | } |
3405 | else { /* add up all the sizes */ |
3314 | else { /* add up all the sizes */ |
3406 | element_size = 0; |
3315 | element_size = 0; |
3407 | contents_size = 0; |
3316 | contents_size = 0; |
3408 | for (i = 0; i != n_elements; ++i) |
3317 | for (i = 0; i != n_elements; ++i) |
3409 | contents_size += request2size(sizes[i]); |
3318 | contents_size += request2size(sizes[i]); |
3410 | } |
3319 | } |
3411 | 3320 | ||
3412 | size = contents_size + array_size; |
3321 | size = contents_size + array_size; |
3413 | 3322 | ||
3414 | /* |
3323 | /* |
3415 | Allocate the aggregate chunk. First disable direct-mmapping so |
3324 | Allocate the aggregate chunk. First disable direct-mmapping so |
3416 | malloc won't use it, since we would not be able to later |
3325 | malloc won't use it, since we would not be able to later |
3417 | free/realloc space internal to a segregated mmap region. |
3326 | free/realloc space internal to a segregated mmap region. |
3418 | */ |
3327 | */ |
3419 | was_enabled = use_mmap(m); |
3328 | was_enabled = use_mmap(m); |
3420 | disable_mmap(m); |
3329 | disable_mmap(m); |
3421 | mem = internal_malloc(m, size - CHUNK_OVERHEAD); |
3330 | mem = internal_malloc(m, size - CHUNK_OVERHEAD); |
3422 | if (was_enabled) |
3331 | if (was_enabled) |
3423 | enable_mmap(m); |
3332 | enable_mmap(m); |
3424 | if (mem == 0) |
3333 | if (mem == 0) |
3425 | return 0; |
3334 | return 0; |
3426 | 3335 | ||
3427 | if (PREACTION(m)) return 0; |
3336 | if (PREACTION(m)) return 0; |
3428 | p = mem2chunk(mem); |
3337 | p = mem2chunk(mem); |
3429 | remainder_size = chunksize(p); |
3338 | remainder_size = chunksize(p); |
3430 | 3339 | ||
3431 | assert(!is_mmapped(p)); |
3340 | assert(!is_mmapped(p)); |
3432 | 3341 | ||
3433 | if (opts & 0x2) { /* optionally clear the elements */ |
3342 | if (opts & 0x2) { /* optionally clear the elements */ |
3434 | memset((size_t*)mem, 0, remainder_size - SIZE_T_SIZE - array_size); |
3343 | memset((size_t*)mem, 0, remainder_size - SIZE_T_SIZE - array_size); |
3435 | } |
3344 | } |
3436 | 3345 | ||
3437 | /* If not provided, allocate the pointer array as final part of chunk */ |
3346 | /* If not provided, allocate the pointer array as final part of chunk */ |
3438 | if (marray == 0) { |
3347 | if (marray == 0) { |
3439 | size_t array_chunk_size; |
3348 | size_t array_chunk_size; |
3440 | array_chunk = chunk_plus_offset(p, contents_size); |
3349 | array_chunk = chunk_plus_offset(p, contents_size); |
3441 | array_chunk_size = remainder_size - contents_size; |
3350 | array_chunk_size = remainder_size - contents_size; |
3442 | marray = (void**) (chunk2mem(array_chunk)); |
3351 | marray = (void**) (chunk2mem(array_chunk)); |
3443 | set_size_and_pinuse_of_inuse_chunk(m, array_chunk, array_chunk_size); |
3352 | set_size_and_pinuse_of_inuse_chunk(m, array_chunk, array_chunk_size); |
3444 | remainder_size = contents_size; |
3353 | remainder_size = contents_size; |
3445 | } |
3354 | } |
3446 | 3355 | ||
3447 | /* split out elements */ |
3356 | /* split out elements */ |
3448 | for (i = 0; ; ++i) { |
3357 | for (i = 0; ; ++i) { |
3449 | marray[i] = chunk2mem(p); |
3358 | marray[i] = chunk2mem(p); |
3450 | if (i != n_elements-1) { |
3359 | if (i != n_elements-1) { |
3451 | if (element_size != 0) |
3360 | if (element_size != 0) |
3452 | size = element_size; |
3361 | size = element_size; |
3453 | else |
3362 | else |
3454 | size = request2size(sizes[i]); |
3363 | size = request2size(sizes[i]); |
3455 | remainder_size -= size; |
3364 | remainder_size -= size; |
3456 | set_size_and_pinuse_of_inuse_chunk(m, p, size); |
3365 | set_size_and_pinuse_of_inuse_chunk(m, p, size); |
3457 | p = chunk_plus_offset(p, size); |
3366 | p = chunk_plus_offset(p, size); |
3458 | } |
3367 | } |
3459 | else { /* the final element absorbs any overallocation slop */ |
3368 | else { /* the final element absorbs any overallocation slop */ |
3460 | set_size_and_pinuse_of_inuse_chunk(m, p, remainder_size); |
3369 | set_size_and_pinuse_of_inuse_chunk(m, p, remainder_size); |
3461 | break; |
3370 | break; |
3462 | } |
3371 | } |
3463 | } |
3372 | } |
3464 | 3373 | ||
3465 | #if DEBUG |
3374 | #if DEBUG |
3466 | if (marray != chunks) { |
3375 | if (marray != chunks) { |
3467 | /* final element must have exactly exhausted chunk */ |
3376 | /* final element must have exactly exhausted chunk */ |
3468 | if (element_size != 0) { |
3377 | if (element_size != 0) { |
3469 | assert(remainder_size == element_size); |
3378 | assert(remainder_size == element_size); |
3470 | } |
3379 | } |
3471 | else { |
3380 | else { |
3472 | assert(remainder_size == request2size(sizes[i])); |
3381 | assert(remainder_size == request2size(sizes[i])); |
3473 | } |
3382 | } |
3474 | check_inuse_chunk(m, mem2chunk(marray)); |
3383 | check_inuse_chunk(m, mem2chunk(marray)); |
3475 | } |
3384 | } |
3476 | for (i = 0; i != n_elements; ++i) |
3385 | for (i = 0; i != n_elements; ++i) |
3477 | check_inuse_chunk(m, mem2chunk(marray[i])); |
3386 | check_inuse_chunk(m, mem2chunk(marray[i])); |
3478 | 3387 | ||
3479 | #endif /* DEBUG */ |
3388 | #endif /* DEBUG */ |
3480 | 3389 | ||
3481 | POSTACTION(m); |
3390 | POSTACTION(m); |
3482 | return marray; |
3391 | return marray; |
3483 | } |
3392 | } |
3484 | 3393 | ||
3485 | 3394 | ||
3486 | /* -------------------------- public routines ---------------------------- */ |
3395 | /* -------------------------- public routines ---------------------------- */ |
3487 | 3396 | ||
3488 | #if !ONLY_MSPACES |
3397 | #if !ONLY_MSPACES |
3489 | 3398 | ||
3490 | void* dlmalloc(size_t bytes) { |
3399 | void* dlmalloc(size_t bytes) { |
3491 | /* |
3400 | /* |
3492 | Basic algorithm: |
3401 | Basic algorithm: |
3493 | If a small request (< 256 bytes minus per-chunk overhead): |
3402 | If a small request (< 256 bytes minus per-chunk overhead): |
3494 | 1. If one exists, use a remainderless chunk in associated smallbin. |
3403 | 1. If one exists, use a remainderless chunk in associated smallbin. |
3495 | (Remainderless means that there are too few excess bytes to |
3404 | (Remainderless means that there are too few excess bytes to |
3496 | represent as a chunk.) |
3405 | represent as a chunk.) |
3497 | 2. If it is big enough, use the dv chunk, which is normally the |
3406 | 2. If it is big enough, use the dv chunk, which is normally the |
3498 | chunk adjacent to the one used for the most recent small request. |
3407 | chunk adjacent to the one used for the most recent small request. |
3499 | 3. If one exists, split the smallest available chunk in a bin, |
3408 | 3. If one exists, split the smallest available chunk in a bin, |
3500 | saving remainder in dv. |
3409 | saving remainder in dv. |
3501 | 4. If it is big enough, use the top chunk. |
3410 | 4. If it is big enough, use the top chunk. |
3502 | 5. If available, get memory from system and use it |
3411 | 5. If available, get memory from system and use it |
3503 | Otherwise, for a large request: |
3412 | Otherwise, for a large request: |
3504 | 1. Find the smallest available binned chunk that fits, and use it |
3413 | 1. Find the smallest available binned chunk that fits, and use it |
3505 | if it is better fitting than dv chunk, splitting if necessary. |
3414 | if it is better fitting than dv chunk, splitting if necessary. |
3506 | 2. If better fitting than any binned chunk, use the dv chunk. |
3415 | 2. If better fitting than any binned chunk, use the dv chunk. |
3507 | 3. If it is big enough, use the top chunk. |
3416 | 3. If it is big enough, use the top chunk. |
3508 | 4. If request size >= mmap threshold, try to directly mmap this chunk. |
3417 | 4. If request size >= mmap threshold, try to directly mmap this chunk. |
3509 | 5. If available, get memory from system and use it |
3418 | 5. If available, get memory from system and use it |
3510 | 3419 | ||
3511 | The ugly goto's here ensure that postaction occurs along all paths. |
3420 | The ugly goto's here ensure that postaction occurs along all paths. |
3512 | */ |
3421 | */ |
3513 | 3422 | ||
3514 | if (!PREACTION(gm)) { |
3423 | if (!PREACTION(gm)) { |
3515 | void* mem; |
3424 | void* mem; |
3516 | size_t nb; |
3425 | size_t nb; |
3517 | if (bytes <= MAX_SMALL_REQUEST) { |
3426 | if (bytes <= MAX_SMALL_REQUEST) { |
3518 | bindex_t idx; |
3427 | bindex_t idx; |
3519 | binmap_t smallbits; |
3428 | binmap_t smallbits; |
3520 | nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes); |
3429 | nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes); |
3521 | idx = small_index(nb); |
3430 | idx = small_index(nb); |
3522 | smallbits = gm->smallmap >> idx; |
3431 | smallbits = gm->smallmap >> idx; |
3523 | 3432 | ||
3524 | if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */ |
3433 | if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */ |
3525 | mchunkptr b, p; |
3434 | mchunkptr b, p; |
3526 | idx += ~smallbits & 1; /* Uses next bin if idx empty */ |
3435 | idx += ~smallbits & 1; /* Uses next bin if idx empty */ |
3527 | b = smallbin_at(gm, idx); |
3436 | b = smallbin_at(gm, idx); |
3528 | p = b->fd; |
3437 | p = b->fd; |
3529 | assert(chunksize(p) == small_index2size(idx)); |
3438 | assert(chunksize(p) == small_index2size(idx)); |
3530 | unlink_first_small_chunk(gm, b, p, idx); |
3439 | unlink_first_small_chunk(gm, b, p, idx); |
3531 | set_inuse_and_pinuse(gm, p, small_index2size(idx)); |
3440 | set_inuse_and_pinuse(gm, p, small_index2size(idx)); |
3532 | mem = chunk2mem(p); |
3441 | mem = chunk2mem(p); |
3533 | check_malloced_chunk(gm, mem, nb); |
3442 | check_malloced_chunk(gm, mem, nb); |
3534 | goto postaction; |
3443 | goto postaction; |
3535 | } |
3444 | } |
3536 | 3445 | ||
3537 | else if (nb > gm->dvsize) { |
3446 | else if (nb > gm->dvsize) { |
3538 | if (smallbits != 0) { /* Use chunk in next nonempty smallbin */ |
3447 | if (smallbits != 0) { /* Use chunk in next nonempty smallbin */ |
3539 | mchunkptr b, p, r; |
3448 | mchunkptr b, p, r; |
3540 | size_t rsize; |
3449 | size_t rsize; |
3541 | bindex_t i; |
3450 | bindex_t i; |
3542 | binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx)); |
3451 | binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx)); |
3543 | binmap_t leastbit = least_bit(leftbits); |
3452 | binmap_t leastbit = least_bit(leftbits); |
3544 | compute_bit2idx(leastbit, i); |
3453 | compute_bit2idx(leastbit, i); |
3545 | b = smallbin_at(gm, i); |
3454 | b = smallbin_at(gm, i); |
3546 | p = b->fd; |
3455 | p = b->fd; |
3547 | assert(chunksize(p) == small_index2size(i)); |
3456 | assert(chunksize(p) == small_index2size(i)); |
3548 | unlink_first_small_chunk(gm, b, p, i); |
3457 | unlink_first_small_chunk(gm, b, p, i); |
3549 | rsize = small_index2size(i) - nb; |
3458 | rsize = small_index2size(i) - nb; |
3550 | /* Fit here cannot be remainderless if 4byte sizes */ |
3459 | /* Fit here cannot be remainderless if 4byte sizes */ |
3551 | if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE) |
3460 | if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE) |
3552 | set_inuse_and_pinuse(gm, p, small_index2size(i)); |
3461 | set_inuse_and_pinuse(gm, p, small_index2size(i)); |
3553 | else { |
3462 | else { |
3554 | set_size_and_pinuse_of_inuse_chunk(gm, p, nb); |
3463 | set_size_and_pinuse_of_inuse_chunk(gm, p, nb); |
3555 | r = chunk_plus_offset(p, nb); |
3464 | r = chunk_plus_offset(p, nb); |
3556 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3465 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3557 | replace_dv(gm, r, rsize); |
3466 | replace_dv(gm, r, rsize); |
3558 | } |
3467 | } |
3559 | mem = chunk2mem(p); |
3468 | mem = chunk2mem(p); |
3560 | check_malloced_chunk(gm, mem, nb); |
3469 | check_malloced_chunk(gm, mem, nb); |
3561 | goto postaction; |
3470 | goto postaction; |
3562 | } |
3471 | } |
3563 | 3472 | ||
3564 | else if (gm->treemap != 0 && (mem = tmalloc_small(gm, nb)) != 0) { |
3473 | else if (gm->treemap != 0 && (mem = tmalloc_small(gm, nb)) != 0) { |
3565 | check_malloced_chunk(gm, mem, nb); |
3474 | check_malloced_chunk(gm, mem, nb); |
3566 | goto postaction; |
3475 | goto postaction; |
3567 | } |
3476 | } |
3568 | } |
3477 | } |
3569 | } |
3478 | } |
3570 | else if (bytes >= MAX_REQUEST) |
3479 | else if (bytes >= MAX_REQUEST) |
3571 | nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */ |
3480 | nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */ |
3572 | else { |
3481 | else { |
3573 | nb = pad_request(bytes); |
3482 | nb = pad_request(bytes); |
3574 | if (gm->treemap != 0 && (mem = tmalloc_large(gm, nb)) != 0) { |
3483 | if (gm->treemap != 0 && (mem = tmalloc_large(gm, nb)) != 0) { |
3575 | check_malloced_chunk(gm, mem, nb); |
3484 | check_malloced_chunk(gm, mem, nb); |
3576 | goto postaction; |
3485 | goto postaction; |
3577 | } |
3486 | } |
3578 | } |
3487 | } |
3579 | 3488 | ||
3580 | if (nb <= gm->dvsize) { |
3489 | if (nb <= gm->dvsize) { |
3581 | size_t rsize = gm->dvsize - nb; |
3490 | size_t rsize = gm->dvsize - nb; |
3582 | mchunkptr p = gm->dv; |
3491 | mchunkptr p = gm->dv; |
3583 | if (rsize >= MIN_CHUNK_SIZE) { /* split dv */ |
3492 | if (rsize >= MIN_CHUNK_SIZE) { /* split dv */ |
3584 | mchunkptr r = gm->dv = chunk_plus_offset(p, nb); |
3493 | mchunkptr r = gm->dv = chunk_plus_offset(p, nb); |
3585 | gm->dvsize = rsize; |
3494 | gm->dvsize = rsize; |
3586 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3495 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3587 | set_size_and_pinuse_of_inuse_chunk(gm, p, nb); |
3496 | set_size_and_pinuse_of_inuse_chunk(gm, p, nb); |
3588 | } |
3497 | } |
3589 | else { /* exhaust dv */ |
3498 | else { /* exhaust dv */ |
3590 | size_t dvs = gm->dvsize; |
3499 | size_t dvs = gm->dvsize; |
3591 | gm->dvsize = 0; |
3500 | gm->dvsize = 0; |
3592 | gm->dv = 0; |
3501 | gm->dv = 0; |
3593 | set_inuse_and_pinuse(gm, p, dvs); |
3502 | set_inuse_and_pinuse(gm, p, dvs); |
3594 | } |
3503 | } |
3595 | mem = chunk2mem(p); |
3504 | mem = chunk2mem(p); |
3596 | check_malloced_chunk(gm, mem, nb); |
3505 | check_malloced_chunk(gm, mem, nb); |
3597 | goto postaction; |
3506 | goto postaction; |
3598 | } |
3507 | } |
3599 | 3508 | ||
3600 | else if (nb < gm->topsize) { /* Split top */ |
3509 | else if (nb < gm->topsize) { /* Split top */ |
3601 | size_t rsize = gm->topsize -= nb; |
3510 | size_t rsize = gm->topsize -= nb; |
3602 | mchunkptr p = gm->top; |
3511 | mchunkptr p = gm->top; |
3603 | mchunkptr r = gm->top = chunk_plus_offset(p, nb); |
3512 | mchunkptr r = gm->top = chunk_plus_offset(p, nb); |
3604 | r->head = rsize | PINUSE_BIT; |
3513 | r->head = rsize | PINUSE_BIT; |
3605 | set_size_and_pinuse_of_inuse_chunk(gm, p, nb); |
3514 | set_size_and_pinuse_of_inuse_chunk(gm, p, nb); |
3606 | mem = chunk2mem(p); |
3515 | mem = chunk2mem(p); |
3607 | check_top_chunk(gm, gm->top); |
3516 | check_top_chunk(gm, gm->top); |
3608 | check_malloced_chunk(gm, mem, nb); |
3517 | check_malloced_chunk(gm, mem, nb); |
3609 | goto postaction; |
3518 | goto postaction; |
3610 | } |
3519 | } |
3611 | 3520 | ||
3612 | mem = sys_alloc(gm, nb); |
3521 | mem = sys_alloc(gm, nb); |
3613 | 3522 | ||
3614 | postaction: |
3523 | postaction: |
3615 | POSTACTION(gm); |
3524 | POSTACTION(gm); |
3616 | return mem; |
3525 | return mem; |
3617 | } |
3526 | } |
3618 | 3527 | ||
3619 | return 0; |
3528 | return 0; |
3620 | } |
3529 | } |
3621 | 3530 | ||
3622 | void dlfree(void* mem) { |
3531 | void dlfree(void* mem) { |
3623 | /* |
3532 | /* |
3624 | Consolidate freed chunks with preceeding or succeeding bordering |
3533 | Consolidate freed chunks with preceeding or succeeding bordering |
3625 | free chunks, if they exist, and then place in a bin. Intermixed |
3534 | free chunks, if they exist, and then place in a bin. Intermixed |
3626 | with special cases for top, dv, mmapped chunks, and usage errors. |
3535 | with special cases for top, dv, mmapped chunks, and usage errors. |
3627 | */ |
3536 | */ |
3628 | 3537 | ||
3629 | if (mem != 0) { |
3538 | if (mem != 0) { |
3630 | mchunkptr p = mem2chunk(mem); |
3539 | mchunkptr p = mem2chunk(mem); |
3631 | #if FOOTERS |
3540 | #if FOOTERS |
3632 | mstate fm = get_mstate_for(p); |
3541 | mstate fm = get_mstate_for(p); |
3633 | if (!ok_magic(fm)) { |
3542 | if (!ok_magic(fm)) { |
3634 | USAGE_ERROR_ACTION(fm, p); |
3543 | USAGE_ERROR_ACTION(fm, p); |
3635 | return; |
3544 | return; |
3636 | } |
3545 | } |
3637 | #else /* FOOTERS */ |
3546 | #else /* FOOTERS */ |
3638 | #define fm gm |
3547 | #define fm gm |
3639 | #endif /* FOOTERS */ |
3548 | #endif /* FOOTERS */ |
3640 | if (!PREACTION(fm)) { |
3549 | if (!PREACTION(fm)) { |
3641 | check_inuse_chunk(fm, p); |
3550 | check_inuse_chunk(fm, p); |
3642 | if (RTCHECK(ok_address(fm, p) && ok_cinuse(p))) { |
3551 | if (RTCHECK(ok_address(fm, p) && ok_cinuse(p))) { |
3643 | size_t psize = chunksize(p); |
3552 | size_t psize = chunksize(p); |
3644 | mchunkptr next = chunk_plus_offset(p, psize); |
3553 | mchunkptr next = chunk_plus_offset(p, psize); |
3645 | if (!pinuse(p)) { |
3554 | if (!pinuse(p)) { |
3646 | size_t prevsize = p->prev_foot; |
3555 | size_t prevsize = p->prev_foot; |
3647 | if ((prevsize & IS_MMAPPED_BIT) != 0) { |
3556 | if ((prevsize & IS_MMAPPED_BIT) != 0) { |
3648 | prevsize &= ~IS_MMAPPED_BIT; |
3557 | prevsize &= ~IS_MMAPPED_BIT; |
3649 | psize += prevsize + MMAP_FOOT_PAD; |
3558 | psize += prevsize + MMAP_FOOT_PAD; |
3650 | if (CALL_MUNMAP((char*)p - prevsize, psize) == 0) |
3559 | if (CALL_MUNMAP((char*)p - prevsize, psize) == 0) |
3651 | fm->footprint -= psize; |
3560 | fm->footprint -= psize; |
3652 | goto postaction; |
3561 | goto postaction; |
3653 | } |
3562 | } |
3654 | else { |
3563 | else { |
3655 | mchunkptr prev = chunk_minus_offset(p, prevsize); |
3564 | mchunkptr prev = chunk_minus_offset(p, prevsize); |
3656 | psize += prevsize; |
3565 | psize += prevsize; |
3657 | p = prev; |
3566 | p = prev; |
3658 | if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */ |
3567 | if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */ |
3659 | if (p != fm->dv) { |
3568 | if (p != fm->dv) { |
3660 | unlink_chunk(fm, p, prevsize); |
3569 | unlink_chunk(fm, p, prevsize); |
3661 | } |
3570 | } |
3662 | else if ((next->head & INUSE_BITS) == INUSE_BITS) { |
3571 | else if ((next->head & INUSE_BITS) == INUSE_BITS) { |
3663 | fm->dvsize = psize; |
3572 | fm->dvsize = psize; |
3664 | set_free_with_pinuse(p, psize, next); |
3573 | set_free_with_pinuse(p, psize, next); |
3665 | goto postaction; |
3574 | goto postaction; |
3666 | } |
3575 | } |
3667 | } |
3576 | } |
3668 | else |
3577 | else |
3669 | goto erroraction; |
3578 | goto erroraction; |
3670 | } |
3579 | } |
3671 | } |
3580 | } |
3672 | 3581 | ||
3673 | if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) { |
3582 | if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) { |
3674 | if (!cinuse(next)) { /* consolidate forward */ |
3583 | if (!cinuse(next)) { /* consolidate forward */ |
3675 | if (next == fm->top) { |
3584 | if (next == fm->top) { |
3676 | size_t tsize = fm->topsize += psize; |
3585 | size_t tsize = fm->topsize += psize; |
3677 | fm->top = p; |
3586 | fm->top = p; |
3678 | p->head = tsize | PINUSE_BIT; |
3587 | p->head = tsize | PINUSE_BIT; |
3679 | if (p == fm->dv) { |
3588 | if (p == fm->dv) { |
3680 | fm->dv = 0; |
3589 | fm->dv = 0; |
3681 | fm->dvsize = 0; |
3590 | fm->dvsize = 0; |
3682 | } |
3591 | } |
3683 | if (should_trim(fm, tsize)) |
3592 | if (should_trim(fm, tsize)) |
3684 | sys_trim(fm, 0); |
3593 | sys_trim(fm, 0); |
3685 | goto postaction; |
3594 | goto postaction; |
3686 | } |
3595 | } |
3687 | else if (next == fm->dv) { |
3596 | else if (next == fm->dv) { |
3688 | size_t dsize = fm->dvsize += psize; |
3597 | size_t dsize = fm->dvsize += psize; |
3689 | fm->dv = p; |
3598 | fm->dv = p; |
3690 | set_size_and_pinuse_of_free_chunk(p, dsize); |
3599 | set_size_and_pinuse_of_free_chunk(p, dsize); |
3691 | goto postaction; |
3600 | goto postaction; |
3692 | } |
3601 | } |
3693 | else { |
3602 | else { |
3694 | size_t nsize = chunksize(next); |
3603 | size_t nsize = chunksize(next); |
3695 | psize += nsize; |
3604 | psize += nsize; |
3696 | unlink_chunk(fm, next, nsize); |
3605 | unlink_chunk(fm, next, nsize); |
3697 | set_size_and_pinuse_of_free_chunk(p, psize); |
3606 | set_size_and_pinuse_of_free_chunk(p, psize); |
3698 | if (p == fm->dv) { |
3607 | if (p == fm->dv) { |
3699 | fm->dvsize = psize; |
3608 | fm->dvsize = psize; |
3700 | goto postaction; |
3609 | goto postaction; |
3701 | } |
3610 | } |
3702 | } |
3611 | } |
3703 | } |
3612 | } |
3704 | else |
3613 | else |
3705 | set_free_with_pinuse(p, psize, next); |
3614 | set_free_with_pinuse(p, psize, next); |
3706 | insert_chunk(fm, p, psize); |
3615 | insert_chunk(fm, p, psize); |
3707 | check_free_chunk(fm, p); |
3616 | check_free_chunk(fm, p); |
3708 | goto postaction; |
3617 | goto postaction; |
3709 | } |
3618 | } |
3710 | } |
3619 | } |
3711 | erroraction: |
3620 | erroraction: |
3712 | USAGE_ERROR_ACTION(fm, p); |
3621 | USAGE_ERROR_ACTION(fm, p); |
3713 | postaction: |
3622 | postaction: |
3714 | POSTACTION(fm); |
3623 | POSTACTION(fm); |
3715 | } |
3624 | } |
3716 | } |
3625 | } |
3717 | #if !FOOTERS |
3626 | #if !FOOTERS |
3718 | #undef fm |
3627 | #undef fm |
3719 | #endif /* FOOTERS */ |
3628 | #endif /* FOOTERS */ |
3720 | } |
3629 | } |
3721 | 3630 | ||
3722 | void* dlcalloc(size_t n_elements, size_t elem_size) { |
3631 | void* dlcalloc(size_t n_elements, size_t elem_size) { |
3723 | void* mem; |
3632 | void* mem; |
3724 | size_t req = 0; |
3633 | size_t req = 0; |
3725 | if (n_elements != 0) { |
3634 | if (n_elements != 0) { |
3726 | req = n_elements * elem_size; |
3635 | req = n_elements * elem_size; |
3727 | if (((n_elements | elem_size) & ~(size_t)0xffff) && |
3636 | if (((n_elements | elem_size) & ~(size_t)0xffff) && |
3728 | (req / n_elements != elem_size)) |
3637 | (req / n_elements != elem_size)) |
3729 | req = MAX_SIZE_T; /* force downstream failure on overflow */ |
3638 | req = MAX_SIZE_T; /* force downstream failure on overflow */ |
3730 | } |
3639 | } |
3731 | mem = dlmalloc(req); |
3640 | mem = dlmalloc(req); |
3732 | if (mem != 0 && calloc_must_clear(mem2chunk(mem))) |
3641 | if (mem != 0 && calloc_must_clear(mem2chunk(mem))) |
3733 | memset(mem, 0, req); |
3642 | memset(mem, 0, req); |
3734 | return mem; |
3643 | return mem; |
3735 | } |
3644 | } |
3736 | 3645 | ||
3737 | void* dlrealloc(void* oldmem, size_t bytes) { |
3646 | void* dlrealloc(void* oldmem, size_t bytes) { |
3738 | if (oldmem == 0) |
3647 | if (oldmem == 0) |
3739 | return dlmalloc(bytes); |
3648 | return dlmalloc(bytes); |
3740 | #ifdef REALLOC_ZERO_BYTES_FREES |
3649 | #ifdef REALLOC_ZERO_BYTES_FREES |
3741 | if (bytes == 0) { |
3650 | if (bytes == 0) { |
3742 | dlfree(oldmem); |
3651 | dlfree(oldmem); |
3743 | return 0; |
3652 | return 0; |
3744 | } |
3653 | } |
3745 | #endif /* REALLOC_ZERO_BYTES_FREES */ |
3654 | #endif /* REALLOC_ZERO_BYTES_FREES */ |
3746 | else { |
3655 | else { |
3747 | #if ! FOOTERS |
3656 | #if ! FOOTERS |
3748 | mstate m = gm; |
3657 | mstate m = gm; |
3749 | #else /* FOOTERS */ |
3658 | #else /* FOOTERS */ |
3750 | mstate m = get_mstate_for(mem2chunk(oldmem)); |
3659 | mstate m = get_mstate_for(mem2chunk(oldmem)); |
3751 | if (!ok_magic(m)) { |
3660 | if (!ok_magic(m)) { |
3752 | USAGE_ERROR_ACTION(m, oldmem); |
3661 | USAGE_ERROR_ACTION(m, oldmem); |
3753 | return 0; |
3662 | return 0; |
3754 | } |
3663 | } |
3755 | #endif /* FOOTERS */ |
3664 | #endif /* FOOTERS */ |
3756 | return internal_realloc(m, oldmem, bytes); |
3665 | return internal_realloc(m, oldmem, bytes); |
3757 | } |
3666 | } |
3758 | } |
3667 | } |
3759 | 3668 | ||
3760 | void* dlmemalign(size_t alignment, size_t bytes) { |
3669 | void* dlmemalign(size_t alignment, size_t bytes) { |
3761 | return internal_memalign(gm, alignment, bytes); |
3670 | return internal_memalign(gm, alignment, bytes); |
3762 | } |
3671 | } |
3763 | 3672 | ||
3764 | void** dlindependent_calloc(size_t n_elements, size_t elem_size, |
3673 | void** dlindependent_calloc(size_t n_elements, size_t elem_size, |
3765 | void* chunks[]) { |
3674 | void* chunks[]) { |
3766 | size_t sz = elem_size; /* serves as 1-element array */ |
3675 | size_t sz = elem_size; /* serves as 1-element array */ |
3767 | return ialloc(gm, n_elements, &sz, 3, chunks); |
3676 | return ialloc(gm, n_elements, &sz, 3, chunks); |
3768 | } |
3677 | } |
3769 | 3678 | ||
3770 | void** dlindependent_comalloc(size_t n_elements, size_t sizes[], |
3679 | void** dlindependent_comalloc(size_t n_elements, size_t sizes[], |
3771 | void* chunks[]) { |
3680 | void* chunks[]) { |
3772 | return ialloc(gm, n_elements, sizes, 0, chunks); |
3681 | return ialloc(gm, n_elements, sizes, 0, chunks); |
3773 | } |
3682 | } |
3774 | 3683 | ||
3775 | void* dlvalloc(size_t bytes) { |
3684 | void* dlvalloc(size_t bytes) { |
3776 | size_t pagesz; |
3685 | size_t pagesz; |
3777 | init_mparams(); |
3686 | init_mparams(); |
3778 | pagesz = mparams.page_size; |
3687 | pagesz = mparams.page_size; |
3779 | return dlmemalign(pagesz, bytes); |
3688 | return dlmemalign(pagesz, bytes); |
3780 | } |
3689 | } |
3781 | 3690 | ||
3782 | void* dlpvalloc(size_t bytes) { |
3691 | void* dlpvalloc(size_t bytes) { |
3783 | size_t pagesz; |
3692 | size_t pagesz; |
3784 | init_mparams(); |
3693 | init_mparams(); |
3785 | pagesz = mparams.page_size; |
3694 | pagesz = mparams.page_size; |
3786 | return dlmemalign(pagesz, (bytes + pagesz - SIZE_T_ONE) & ~(pagesz - SIZE_T_ONE)); |
3695 | return dlmemalign(pagesz, (bytes + pagesz - SIZE_T_ONE) & ~(pagesz - SIZE_T_ONE)); |
3787 | } |
3696 | } |
3788 | 3697 | ||
3789 | int dlmalloc_trim(size_t pad) { |
3698 | int dlmalloc_trim(size_t pad) { |
3790 | int result = 0; |
3699 | int result = 0; |
3791 | if (!PREACTION(gm)) { |
3700 | if (!PREACTION(gm)) { |
3792 | result = sys_trim(gm, pad); |
3701 | result = sys_trim(gm, pad); |
3793 | POSTACTION(gm); |
3702 | POSTACTION(gm); |
3794 | } |
3703 | } |
3795 | return result; |
3704 | return result; |
3796 | } |
3705 | } |
3797 | 3706 | ||
3798 | size_t dlmalloc_footprint(void) { |
3707 | size_t dlmalloc_footprint(void) { |
3799 | return gm->footprint; |
3708 | return gm->footprint; |
3800 | } |
3709 | } |
3801 | 3710 | ||
3802 | size_t dlmalloc_max_footprint(void) { |
3711 | size_t dlmalloc_max_footprint(void) { |
3803 | return gm->max_footprint; |
3712 | return gm->max_footprint; |
3804 | } |
3713 | } |
3805 | 3714 | ||
3806 | #if !NO_MALLINFO |
3715 | #if !NO_MALLINFO |
3807 | struct mallinfo dlmallinfo(void) { |
3716 | struct mallinfo dlmallinfo(void) { |
3808 | return internal_mallinfo(gm); |
3717 | return internal_mallinfo(gm); |
3809 | } |
3718 | } |
3810 | #endif /* NO_MALLINFO */ |
3719 | #endif /* NO_MALLINFO */ |
3811 | 3720 | ||
3812 | void dlmalloc_stats() { |
3721 | void dlmalloc_stats() { |
3813 | internal_malloc_stats(gm); |
3722 | internal_malloc_stats(gm); |
3814 | } |
3723 | } |
3815 | 3724 | ||
3816 | size_t dlmalloc_usable_size(void* mem) { |
3725 | size_t dlmalloc_usable_size(void* mem) { |
3817 | if (mem != 0) { |
3726 | if (mem != 0) { |
3818 | mchunkptr p = mem2chunk(mem); |
3727 | mchunkptr p = mem2chunk(mem); |
3819 | if (cinuse(p)) |
3728 | if (cinuse(p)) |
3820 | return chunksize(p) - overhead_for(p); |
3729 | return chunksize(p) - overhead_for(p); |
3821 | } |
3730 | } |
3822 | return 0; |
3731 | return 0; |
3823 | } |
3732 | } |
3824 | 3733 | ||
3825 | int dlmallopt(int param_number, int value) { |
3734 | int dlmallopt(int param_number, int value) { |
3826 | return change_mparam(param_number, value); |
3735 | return change_mparam(param_number, value); |
3827 | } |
3736 | } |
3828 | 3737 | ||
3829 | #endif /* !ONLY_MSPACES */ |
3738 | #endif /* !ONLY_MSPACES */ |
3830 | 3739 | ||
3831 | /* ----------------------------- user mspaces ---------------------------- */ |
3740 | /* ----------------------------- user mspaces ---------------------------- */ |
3832 | 3741 | ||
3833 | #if MSPACES |
3742 | #if MSPACES |
3834 | 3743 | ||
3835 | static mstate init_user_mstate(char* tbase, size_t tsize) { |
3744 | static mstate init_user_mstate(char* tbase, size_t tsize) { |
3836 | size_t msize = pad_request(sizeof(struct malloc_state)); |
3745 | size_t msize = pad_request(sizeof(struct malloc_state)); |
3837 | mchunkptr mn; |
3746 | mchunkptr mn; |
3838 | mchunkptr msp = align_as_chunk(tbase); |
3747 | mchunkptr msp = align_as_chunk(tbase); |
3839 | mstate m = (mstate)(chunk2mem(msp)); |
3748 | mstate m = (mstate)(chunk2mem(msp)); |
3840 | memset(m, 0, msize); |
3749 | memset(m, 0, msize); |
3841 | INITIAL_LOCK(&m->mutex); |
3750 | INITIAL_LOCK(&m->mutex); |
3842 | msp->head = (msize|PINUSE_BIT|CINUSE_BIT); |
3751 | msp->head = (msize|PINUSE_BIT|CINUSE_BIT); |
3843 | m->seg.base = m->least_addr = tbase; |
3752 | m->seg.base = m->least_addr = tbase; |
3844 | m->seg.size = m->footprint = m->max_footprint = tsize; |
3753 | m->seg.size = m->footprint = m->max_footprint = tsize; |
3845 | m->magic = mparams.magic; |
3754 | m->magic = mparams.magic; |
3846 | m->mflags = mparams.default_mflags; |
3755 | m->mflags = mparams.default_mflags; |
3847 | disable_contiguous(m); |
3756 | disable_contiguous(m); |
3848 | init_bins(m); |
3757 | init_bins(m); |
3849 | mn = next_chunk(mem2chunk(m)); |
3758 | mn = next_chunk(mem2chunk(m)); |
3850 | init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) - TOP_FOOT_SIZE); |
3759 | init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) - TOP_FOOT_SIZE); |
3851 | check_top_chunk(m, m->top); |
3760 | check_top_chunk(m, m->top); |
3852 | return m; |
3761 | return m; |
3853 | } |
3762 | } |
3854 | 3763 | ||
3855 | mspace create_mspace(size_t capacity, int locked) { |
3764 | mspace create_mspace(size_t capacity, int locked) { |
3856 | mstate m = 0; |
3765 | mstate m = 0; |
3857 | size_t msize = pad_request(sizeof(struct malloc_state)); |
3766 | size_t msize = pad_request(sizeof(struct malloc_state)); |
3858 | init_mparams(); /* Ensure pagesize etc initialized */ |
3767 | init_mparams(); /* Ensure pagesize etc initialized */ |
3859 | 3768 | ||
3860 | if (capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) { |
3769 | if (capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) { |
3861 | size_t rs = ((capacity == 0)? mparams.granularity : |
3770 | size_t rs = ((capacity == 0)? mparams.granularity : |
3862 | (capacity + TOP_FOOT_SIZE + msize)); |
3771 | (capacity + TOP_FOOT_SIZE + msize)); |
3863 | size_t tsize = granularity_align(rs); |
3772 | size_t tsize = granularity_align(rs); |
3864 | char* tbase = (char*)(CALL_MMAP(tsize)); |
3773 | char* tbase = (char*)(CALL_MMAP(tsize)); |
3865 | if (tbase != CMFAIL) { |
3774 | if (tbase != CMFAIL) { |
3866 | m = init_user_mstate(tbase, tsize); |
3775 | m = init_user_mstate(tbase, tsize); |
3867 | m->seg.sflags = IS_MMAPPED_BIT; |
3776 | m->seg.sflags = IS_MMAPPED_BIT; |
3868 | set_lock(m, locked); |
3777 | set_lock(m, locked); |
3869 | } |
3778 | } |
3870 | } |
3779 | } |
3871 | return (mspace)m; |
3780 | return (mspace)m; |
3872 | } |
3781 | } |
3873 | 3782 | ||
3874 | mspace create_mspace_with_base(void* base, size_t capacity, int locked) { |
3783 | mspace create_mspace_with_base(void* base, size_t capacity, int locked) { |
3875 | mstate m = 0; |
3784 | mstate m = 0; |
3876 | size_t msize = pad_request(sizeof(struct malloc_state)); |
3785 | size_t msize = pad_request(sizeof(struct malloc_state)); |
3877 | init_mparams(); /* Ensure pagesize etc initialized */ |
3786 | init_mparams(); /* Ensure pagesize etc initialized */ |
3878 | 3787 | ||
3879 | if (capacity > msize + TOP_FOOT_SIZE && |
3788 | if (capacity > msize + TOP_FOOT_SIZE && |
3880 | capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) { |
3789 | capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) { |
3881 | m = init_user_mstate((char*)base, capacity); |
3790 | m = init_user_mstate((char*)base, capacity); |
3882 | m->seg.sflags = EXTERN_BIT; |
3791 | m->seg.sflags = EXTERN_BIT; |
3883 | set_lock(m, locked); |
3792 | set_lock(m, locked); |
3884 | } |
3793 | } |
3885 | return (mspace)m; |
3794 | return (mspace)m; |
3886 | } |
3795 | } |
3887 | 3796 | ||
3888 | size_t destroy_mspace(mspace msp) { |
3797 | size_t destroy_mspace(mspace msp) { |
3889 | size_t freed = 0; |
3798 | size_t freed = 0; |
3890 | mstate ms = (mstate)msp; |
3799 | mstate ms = (mstate)msp; |
3891 | if (ok_magic(ms)) { |
3800 | if (ok_magic(ms)) { |
3892 | msegmentptr sp = &ms->seg; |
3801 | msegmentptr sp = &ms->seg; |
3893 | while (sp != 0) { |
3802 | while (sp != 0) { |
3894 | char* base = sp->base; |
3803 | char* base = sp->base; |
3895 | size_t size = sp->size; |
3804 | size_t size = sp->size; |
3896 | flag_t flag = sp->sflags; |
3805 | flag_t flag = sp->sflags; |
3897 | sp = sp->next; |
3806 | sp = sp->next; |
3898 | if ((flag & IS_MMAPPED_BIT) && !(flag & EXTERN_BIT) && |
3807 | if ((flag & IS_MMAPPED_BIT) && !(flag & EXTERN_BIT) && |
3899 | CALL_MUNMAP(base, size) == 0) |
3808 | CALL_MUNMAP(base, size) == 0) |
3900 | freed += size; |
3809 | freed += size; |
3901 | } |
3810 | } |
3902 | } |
3811 | } |
3903 | else { |
3812 | else { |
3904 | USAGE_ERROR_ACTION(ms,ms); |
3813 | USAGE_ERROR_ACTION(ms,ms); |
3905 | } |
3814 | } |
3906 | return freed; |
3815 | return freed; |
3907 | } |
3816 | } |
3908 | 3817 | ||
3909 | /* |
3818 | /* |
3910 | mspace versions of routines are near-clones of the global |
3819 | mspace versions of routines are near-clones of the global |
3911 | versions. This is not so nice but better than the alternatives. |
3820 | versions. This is not so nice but better than the alternatives. |
3912 | */ |
3821 | */ |
3913 | 3822 | ||
3914 | 3823 | ||
3915 | void* mspace_malloc(mspace msp, size_t bytes) { |
3824 | void* mspace_malloc(mspace msp, size_t bytes) { |
3916 | mstate ms = (mstate)msp; |
3825 | mstate ms = (mstate)msp; |
3917 | if (!ok_magic(ms)) { |
3826 | if (!ok_magic(ms)) { |
3918 | USAGE_ERROR_ACTION(ms,ms); |
3827 | USAGE_ERROR_ACTION(ms,ms); |
3919 | return 0; |
3828 | return 0; |
3920 | } |
3829 | } |
3921 | if (!PREACTION(ms)) { |
3830 | if (!PREACTION(ms)) { |
3922 | void* mem; |
3831 | void* mem; |
3923 | size_t nb; |
3832 | size_t nb; |
3924 | if (bytes <= MAX_SMALL_REQUEST) { |
3833 | if (bytes <= MAX_SMALL_REQUEST) { |
3925 | bindex_t idx; |
3834 | bindex_t idx; |
3926 | binmap_t smallbits; |
3835 | binmap_t smallbits; |
3927 | nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes); |
3836 | nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes); |
3928 | idx = small_index(nb); |
3837 | idx = small_index(nb); |
3929 | smallbits = ms->smallmap >> idx; |
3838 | smallbits = ms->smallmap >> idx; |
3930 | 3839 | ||
3931 | if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */ |
3840 | if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */ |
3932 | mchunkptr b, p; |
3841 | mchunkptr b, p; |
3933 | idx += ~smallbits & 1; /* Uses next bin if idx empty */ |
3842 | idx += ~smallbits & 1; /* Uses next bin if idx empty */ |
3934 | b = smallbin_at(ms, idx); |
3843 | b = smallbin_at(ms, idx); |
3935 | p = b->fd; |
3844 | p = b->fd; |
3936 | assert(chunksize(p) == small_index2size(idx)); |
3845 | assert(chunksize(p) == small_index2size(idx)); |
3937 | unlink_first_small_chunk(ms, b, p, idx); |
3846 | unlink_first_small_chunk(ms, b, p, idx); |
3938 | set_inuse_and_pinuse(ms, p, small_index2size(idx)); |
3847 | set_inuse_and_pinuse(ms, p, small_index2size(idx)); |
3939 | mem = chunk2mem(p); |
3848 | mem = chunk2mem(p); |
3940 | check_malloced_chunk(ms, mem, nb); |
3849 | check_malloced_chunk(ms, mem, nb); |
3941 | goto postaction; |
3850 | goto postaction; |
3942 | } |
3851 | } |
3943 | 3852 | ||
3944 | else if (nb > ms->dvsize) { |
3853 | else if (nb > ms->dvsize) { |
3945 | if (smallbits != 0) { /* Use chunk in next nonempty smallbin */ |
3854 | if (smallbits != 0) { /* Use chunk in next nonempty smallbin */ |
3946 | mchunkptr b, p, r; |
3855 | mchunkptr b, p, r; |
3947 | size_t rsize; |
3856 | size_t rsize; |
3948 | bindex_t i; |
3857 | bindex_t i; |
3949 | binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx)); |
3858 | binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx)); |
3950 | binmap_t leastbit = least_bit(leftbits); |
3859 | binmap_t leastbit = least_bit(leftbits); |
3951 | compute_bit2idx(leastbit, i); |
3860 | compute_bit2idx(leastbit, i); |
3952 | b = smallbin_at(ms, i); |
3861 | b = smallbin_at(ms, i); |
3953 | p = b->fd; |
3862 | p = b->fd; |
3954 | assert(chunksize(p) == small_index2size(i)); |
3863 | assert(chunksize(p) == small_index2size(i)); |
3955 | unlink_first_small_chunk(ms, b, p, i); |
3864 | unlink_first_small_chunk(ms, b, p, i); |
3956 | rsize = small_index2size(i) - nb; |
3865 | rsize = small_index2size(i) - nb; |
3957 | /* Fit here cannot be remainderless if 4byte sizes */ |
3866 | /* Fit here cannot be remainderless if 4byte sizes */ |
3958 | if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE) |
3867 | if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE) |
3959 | set_inuse_and_pinuse(ms, p, small_index2size(i)); |
3868 | set_inuse_and_pinuse(ms, p, small_index2size(i)); |
3960 | else { |
3869 | else { |
3961 | set_size_and_pinuse_of_inuse_chunk(ms, p, nb); |
3870 | set_size_and_pinuse_of_inuse_chunk(ms, p, nb); |
3962 | r = chunk_plus_offset(p, nb); |
3871 | r = chunk_plus_offset(p, nb); |
3963 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3872 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3964 | replace_dv(ms, r, rsize); |
3873 | replace_dv(ms, r, rsize); |
3965 | } |
3874 | } |
3966 | mem = chunk2mem(p); |
3875 | mem = chunk2mem(p); |
3967 | check_malloced_chunk(ms, mem, nb); |
3876 | check_malloced_chunk(ms, mem, nb); |
3968 | goto postaction; |
3877 | goto postaction; |
3969 | } |
3878 | } |
3970 | 3879 | ||
3971 | else if (ms->treemap != 0 && (mem = tmalloc_small(ms, nb)) != 0) { |
3880 | else if (ms->treemap != 0 && (mem = tmalloc_small(ms, nb)) != 0) { |
3972 | check_malloced_chunk(ms, mem, nb); |
3881 | check_malloced_chunk(ms, mem, nb); |
3973 | goto postaction; |
3882 | goto postaction; |
3974 | } |
3883 | } |
3975 | } |
3884 | } |
3976 | } |
3885 | } |
3977 | else if (bytes >= MAX_REQUEST) |
3886 | else if (bytes >= MAX_REQUEST) |
3978 | nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */ |
3887 | nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */ |
3979 | else { |
3888 | else { |
3980 | nb = pad_request(bytes); |
3889 | nb = pad_request(bytes); |
3981 | if (ms->treemap != 0 && (mem = tmalloc_large(ms, nb)) != 0) { |
3890 | if (ms->treemap != 0 && (mem = tmalloc_large(ms, nb)) != 0) { |
3982 | check_malloced_chunk(ms, mem, nb); |
3891 | check_malloced_chunk(ms, mem, nb); |
3983 | goto postaction; |
3892 | goto postaction; |
3984 | } |
3893 | } |
3985 | } |
3894 | } |
3986 | 3895 | ||
3987 | if (nb <= ms->dvsize) { |
3896 | if (nb <= ms->dvsize) { |
3988 | size_t rsize = ms->dvsize - nb; |
3897 | size_t rsize = ms->dvsize - nb; |
3989 | mchunkptr p = ms->dv; |
3898 | mchunkptr p = ms->dv; |
3990 | if (rsize >= MIN_CHUNK_SIZE) { /* split dv */ |
3899 | if (rsize >= MIN_CHUNK_SIZE) { /* split dv */ |
3991 | mchunkptr r = ms->dv = chunk_plus_offset(p, nb); |
3900 | mchunkptr r = ms->dv = chunk_plus_offset(p, nb); |
3992 | ms->dvsize = rsize; |
3901 | ms->dvsize = rsize; |
3993 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3902 | set_size_and_pinuse_of_free_chunk(r, rsize); |
3994 | set_size_and_pinuse_of_inuse_chunk(ms, p, nb); |
3903 | set_size_and_pinuse_of_inuse_chunk(ms, p, nb); |
3995 | } |
3904 | } |
3996 | else { /* exhaust dv */ |
3905 | else { /* exhaust dv */ |
3997 | size_t dvs = ms->dvsize; |
3906 | size_t dvs = ms->dvsize; |
3998 | ms->dvsize = 0; |
3907 | ms->dvsize = 0; |
3999 | ms->dv = 0; |
3908 | ms->dv = 0; |
4000 | set_inuse_and_pinuse(ms, p, dvs); |
3909 | set_inuse_and_pinuse(ms, p, dvs); |
4001 | } |
3910 | } |
4002 | mem = chunk2mem(p); |
3911 | mem = chunk2mem(p); |
4003 | check_malloced_chunk(ms, mem, nb); |
3912 | check_malloced_chunk(ms, mem, nb); |
4004 | goto postaction; |
3913 | goto postaction; |
4005 | } |
3914 | } |
4006 | 3915 | ||
4007 | else if (nb < ms->topsize) { /* Split top */ |
3916 | else if (nb < ms->topsize) { /* Split top */ |
4008 | size_t rsize = ms->topsize -= nb; |
3917 | size_t rsize = ms->topsize -= nb; |
4009 | mchunkptr p = ms->top; |
3918 | mchunkptr p = ms->top; |
4010 | mchunkptr r = ms->top = chunk_plus_offset(p, nb); |
3919 | mchunkptr r = ms->top = chunk_plus_offset(p, nb); |
4011 | r->head = rsize | PINUSE_BIT; |
3920 | r->head = rsize | PINUSE_BIT; |
4012 | set_size_and_pinuse_of_inuse_chunk(ms, p, nb); |
3921 | set_size_and_pinuse_of_inuse_chunk(ms, p, nb); |
4013 | mem = chunk2mem(p); |
3922 | mem = chunk2mem(p); |
4014 | check_top_chunk(ms, ms->top); |
3923 | check_top_chunk(ms, ms->top); |
4015 | check_malloced_chunk(ms, mem, nb); |
3924 | check_malloced_chunk(ms, mem, nb); |
4016 | goto postaction; |
3925 | goto postaction; |
4017 | } |
3926 | } |
4018 | 3927 | ||
4019 | mem = sys_alloc(ms, nb); |
3928 | mem = sys_alloc(ms, nb); |
4020 | 3929 | ||
4021 | postaction: |
3930 | postaction: |
4022 | POSTACTION(ms); |
3931 | POSTACTION(ms); |
4023 | return mem; |
3932 | return mem; |
4024 | } |
3933 | } |
4025 | 3934 | ||
4026 | return 0; |
3935 | return 0; |
4027 | } |
3936 | } |
4028 | 3937 | ||
4029 | void mspace_free(mspace msp, void* mem) { |
3938 | void mspace_free(mspace msp, void* mem) { |
4030 | if (mem != 0) { |
3939 | if (mem != 0) { |
4031 | mchunkptr p = mem2chunk(mem); |
3940 | mchunkptr p = mem2chunk(mem); |
4032 | #if FOOTERS |
3941 | #if FOOTERS |
4033 | mstate fm = get_mstate_for(p); |
3942 | mstate fm = get_mstate_for(p); |
4034 | #else /* FOOTERS */ |
3943 | #else /* FOOTERS */ |
4035 | mstate fm = (mstate)msp; |
3944 | mstate fm = (mstate)msp; |
4036 | #endif /* FOOTERS */ |
3945 | #endif /* FOOTERS */ |
4037 | if (!ok_magic(fm)) { |
3946 | if (!ok_magic(fm)) { |
4038 | USAGE_ERROR_ACTION(fm, p); |
3947 | USAGE_ERROR_ACTION(fm, p); |
4039 | return; |
3948 | return; |
4040 | } |
3949 | } |
4041 | if (!PREACTION(fm)) { |
3950 | if (!PREACTION(fm)) { |
4042 | check_inuse_chunk(fm, p); |
3951 | check_inuse_chunk(fm, p); |
4043 | if (RTCHECK(ok_address(fm, p) && ok_cinuse(p))) { |
3952 | if (RTCHECK(ok_address(fm, p) && ok_cinuse(p))) { |
4044 | size_t psize = chunksize(p); |
3953 | size_t psize = chunksize(p); |
4045 | mchunkptr next = chunk_plus_offset(p, psize); |
3954 | mchunkptr next = chunk_plus_offset(p, psize); |
4046 | if (!pinuse(p)) { |
3955 | if (!pinuse(p)) { |
4047 | size_t prevsize = p->prev_foot; |
3956 | size_t prevsize = p->prev_foot; |
4048 | if ((prevsize & IS_MMAPPED_BIT) != 0) { |
3957 | if ((prevsize & IS_MMAPPED_BIT) != 0) { |
4049 | prevsize &= ~IS_MMAPPED_BIT; |
3958 | prevsize &= ~IS_MMAPPED_BIT; |
4050 | psize += prevsize + MMAP_FOOT_PAD; |
3959 | psize += prevsize + MMAP_FOOT_PAD; |
4051 | if (CALL_MUNMAP((char*)p - prevsize, psize) == 0) |
3960 | if (CALL_MUNMAP((char*)p - prevsize, psize) == 0) |
4052 | fm->footprint -= psize; |
3961 | fm->footprint -= psize; |
4053 | goto postaction; |
3962 | goto postaction; |
4054 | } |
3963 | } |
4055 | else { |
3964 | else { |
4056 | mchunkptr prev = chunk_minus_offset(p, prevsize); |
3965 | mchunkptr prev = chunk_minus_offset(p, prevsize); |
4057 | psize += prevsize; |
3966 | psize += prevsize; |
4058 | p = prev; |
3967 | p = prev; |
4059 | if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */ |
3968 | if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */ |
4060 | if (p != fm->dv) { |
3969 | if (p != fm->dv) { |
4061 | unlink_chunk(fm, p, prevsize); |
3970 | unlink_chunk(fm, p, prevsize); |
4062 | } |
3971 | } |
4063 | else if ((next->head & INUSE_BITS) == INUSE_BITS) { |
3972 | else if ((next->head & INUSE_BITS) == INUSE_BITS) { |
4064 | fm->dvsize = psize; |
3973 | fm->dvsize = psize; |
4065 | set_free_with_pinuse(p, psize, next); |
3974 | set_free_with_pinuse(p, psize, next); |
4066 | goto postaction; |
3975 | goto postaction; |
4067 | } |
3976 | } |
4068 | } |
3977 | } |
4069 | else |
3978 | else |
4070 | goto erroraction; |
3979 | goto erroraction; |
4071 | } |
3980 | } |
4072 | } |
3981 | } |
4073 | 3982 | ||
4074 | if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) { |
3983 | if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) { |
4075 | if (!cinuse(next)) { /* consolidate forward */ |
3984 | if (!cinuse(next)) { /* consolidate forward */ |
4076 | if (next == fm->top) { |
3985 | if (next == fm->top) { |
4077 | size_t tsize = fm->topsize += psize; |
3986 | size_t tsize = fm->topsize += psize; |
4078 | fm->top = p; |
3987 | fm->top = p; |
4079 | p->head = tsize | PINUSE_BIT; |
3988 | p->head = tsize | PINUSE_BIT; |
4080 | if (p == fm->dv) { |
3989 | if (p == fm->dv) { |
4081 | fm->dv = 0; |
3990 | fm->dv = 0; |
4082 | fm->dvsize = 0; |
3991 | fm->dvsize = 0; |
4083 | } |
3992 | } |
4084 | if (should_trim(fm, tsize)) |
3993 | if (should_trim(fm, tsize)) |
4085 | sys_trim(fm, 0); |
3994 | sys_trim(fm, 0); |
4086 | goto postaction; |
3995 | goto postaction; |
4087 | } |
3996 | } |
4088 | else if (next == fm->dv) { |
3997 | else if (next == fm->dv) { |
4089 | size_t dsize = fm->dvsize += psize; |
3998 | size_t dsize = fm->dvsize += psize; |
4090 | fm->dv = p; |
3999 | fm->dv = p; |
4091 | set_size_and_pinuse_of_free_chunk(p, dsize); |
4000 | set_size_and_pinuse_of_free_chunk(p, dsize); |
4092 | goto postaction; |
4001 | goto postaction; |
4093 | } |
4002 | } |
4094 | else { |
4003 | else { |
4095 | size_t nsize = chunksize(next); |
4004 | size_t nsize = chunksize(next); |
4096 | psize += nsize; |
4005 | psize += nsize; |
4097 | unlink_chunk(fm, next, nsize); |
4006 | unlink_chunk(fm, next, nsize); |
4098 | set_size_and_pinuse_of_free_chunk(p, psize); |
4007 | set_size_and_pinuse_of_free_chunk(p, psize); |
4099 | if (p == fm->dv) { |
4008 | if (p == fm->dv) { |
4100 | fm->dvsize = psize; |
4009 | fm->dvsize = psize; |
4101 | goto postaction; |
4010 | goto postaction; |
4102 | } |
4011 | } |
4103 | } |
4012 | } |
4104 | } |
4013 | } |
4105 | else |
4014 | else |
4106 | set_free_with_pinuse(p, psize, next); |
4015 | set_free_with_pinuse(p, psize, next); |
4107 | insert_chunk(fm, p, psize); |
4016 | insert_chunk(fm, p, psize); |
4108 | check_free_chunk(fm, p); |
4017 | check_free_chunk(fm, p); |
4109 | goto postaction; |
4018 | goto postaction; |
4110 | } |
4019 | } |
4111 | } |
4020 | } |
4112 | erroraction: |
4021 | erroraction: |
4113 | USAGE_ERROR_ACTION(fm, p); |
4022 | USAGE_ERROR_ACTION(fm, p); |
4114 | postaction: |
4023 | postaction: |
4115 | POSTACTION(fm); |
4024 | POSTACTION(fm); |
4116 | } |
4025 | } |
4117 | } |
4026 | } |
4118 | } |
4027 | } |
4119 | 4028 | ||
4120 | void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size) { |
4029 | void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size) { |
4121 | void* mem; |
4030 | void* mem; |
4122 | size_t req = 0; |
4031 | size_t req = 0; |
4123 | mstate ms = (mstate)msp; |
4032 | mstate ms = (mstate)msp; |
4124 | if (!ok_magic(ms)) { |
4033 | if (!ok_magic(ms)) { |
4125 | USAGE_ERROR_ACTION(ms,ms); |
4034 | USAGE_ERROR_ACTION(ms,ms); |
4126 | return 0; |
4035 | return 0; |
4127 | } |
4036 | } |
4128 | if (n_elements != 0) { |
4037 | if (n_elements != 0) { |
4129 | req = n_elements * elem_size; |
4038 | req = n_elements * elem_size; |
4130 | if (((n_elements | elem_size) & ~(size_t)0xffff) && |
4039 | if (((n_elements | elem_size) & ~(size_t)0xffff) && |
4131 | (req / n_elements != elem_size)) |
4040 | (req / n_elements != elem_size)) |
4132 | req = MAX_SIZE_T; /* force downstream failure on overflow */ |
4041 | req = MAX_SIZE_T; /* force downstream failure on overflow */ |
4133 | } |
4042 | } |
4134 | mem = internal_malloc(ms, req); |
4043 | mem = internal_malloc(ms, req); |
4135 | if (mem != 0 && calloc_must_clear(mem2chunk(mem))) |
4044 | if (mem != 0 && calloc_must_clear(mem2chunk(mem))) |
4136 | memset(mem, 0, req); |
4045 | memset(mem, 0, req); |
4137 | return mem; |
4046 | return mem; |
4138 | } |
4047 | } |
4139 | 4048 | ||
4140 | void* mspace_realloc(mspace msp, void* oldmem, size_t bytes) { |
4049 | void* mspace_realloc(mspace msp, void* oldmem, size_t bytes) { |
4141 | if (oldmem == 0) |
4050 | if (oldmem == 0) |
4142 | return mspace_malloc(msp, bytes); |
4051 | return mspace_malloc(msp, bytes); |
4143 | #ifdef REALLOC_ZERO_BYTES_FREES |
4052 | #ifdef REALLOC_ZERO_BYTES_FREES |
4144 | if (bytes == 0) { |
4053 | if (bytes == 0) { |
4145 | mspace_free(msp, oldmem); |
4054 | mspace_free(msp, oldmem); |
4146 | return 0; |
4055 | return 0; |
4147 | } |
4056 | } |
4148 | #endif /* REALLOC_ZERO_BYTES_FREES */ |
4057 | #endif /* REALLOC_ZERO_BYTES_FREES */ |
4149 | else { |
4058 | else { |
4150 | #if FOOTERS |
4059 | #if FOOTERS |
4151 | mchunkptr p = mem2chunk(oldmem); |
4060 | mchunkptr p = mem2chunk(oldmem); |
4152 | mstate ms = get_mstate_for(p); |
4061 | mstate ms = get_mstate_for(p); |
4153 | #else /* FOOTERS */ |
4062 | #else /* FOOTERS */ |
4154 | mstate ms = (mstate)msp; |
4063 | mstate ms = (mstate)msp; |
4155 | #endif /* FOOTERS */ |
4064 | #endif /* FOOTERS */ |
4156 | if (!ok_magic(ms)) { |
4065 | if (!ok_magic(ms)) { |
4157 | USAGE_ERROR_ACTION(ms,ms); |
4066 | USAGE_ERROR_ACTION(ms,ms); |
4158 | return 0; |
4067 | return 0; |
4159 | } |
4068 | } |
4160 | return internal_realloc(ms, oldmem, bytes); |
4069 | return internal_realloc(ms, oldmem, bytes); |
4161 | } |
4070 | } |
4162 | } |
4071 | } |
4163 | 4072 | ||
4164 | void* mspace_memalign(mspace msp, size_t alignment, size_t bytes) { |
4073 | void* mspace_memalign(mspace msp, size_t alignment, size_t bytes) { |
4165 | mstate ms = (mstate)msp; |
4074 | mstate ms = (mstate)msp; |
4166 | if (!ok_magic(ms)) { |
4075 | if (!ok_magic(ms)) { |
4167 | USAGE_ERROR_ACTION(ms,ms); |
4076 | USAGE_ERROR_ACTION(ms,ms); |
4168 | return 0; |
4077 | return 0; |
4169 | } |
4078 | } |
4170 | return internal_memalign(ms, alignment, bytes); |
4079 | return internal_memalign(ms, alignment, bytes); |
4171 | } |
4080 | } |
4172 | 4081 | ||
4173 | void** mspace_independent_calloc(mspace msp, size_t n_elements, |
4082 | void** mspace_independent_calloc(mspace msp, size_t n_elements, |
4174 | size_t elem_size, void* chunks[]) { |
4083 | size_t elem_size, void* chunks[]) { |
4175 | size_t sz = elem_size; /* serves as 1-element array */ |
4084 | size_t sz = elem_size; /* serves as 1-element array */ |
4176 | mstate ms = (mstate)msp; |
4085 | mstate ms = (mstate)msp; |
4177 | if (!ok_magic(ms)) { |
4086 | if (!ok_magic(ms)) { |
4178 | USAGE_ERROR_ACTION(ms,ms); |
4087 | USAGE_ERROR_ACTION(ms,ms); |
4179 | return 0; |
4088 | return 0; |
4180 | } |
4089 | } |
4181 | return ialloc(ms, n_elements, &sz, 3, chunks); |
4090 | return ialloc(ms, n_elements, &sz, 3, chunks); |
4182 | } |
4091 | } |
4183 | 4092 | ||
4184 | void** mspace_independent_comalloc(mspace msp, size_t n_elements, |
4093 | void** mspace_independent_comalloc(mspace msp, size_t n_elements, |
4185 | size_t sizes[], void* chunks[]) { |
4094 | size_t sizes[], void* chunks[]) { |
4186 | mstate ms = (mstate)msp; |
4095 | mstate ms = (mstate)msp; |
4187 | if (!ok_magic(ms)) { |
4096 | if (!ok_magic(ms)) { |
4188 | USAGE_ERROR_ACTION(ms,ms); |
4097 | USAGE_ERROR_ACTION(ms,ms); |
4189 | return 0; |
4098 | return 0; |
4190 | } |
4099 | } |
4191 | return ialloc(ms, n_elements, sizes, 0, chunks); |
4100 | return ialloc(ms, n_elements, sizes, 0, chunks); |
4192 | } |
4101 | } |
4193 | 4102 | ||
4194 | int mspace_trim(mspace msp, size_t pad) { |
4103 | int mspace_trim(mspace msp, size_t pad) { |
4195 | int result = 0; |
4104 | int result = 0; |
4196 | mstate ms = (mstate)msp; |
4105 | mstate ms = (mstate)msp; |
4197 | if (ok_magic(ms)) { |
4106 | if (ok_magic(ms)) { |
4198 | if (!PREACTION(ms)) { |
4107 | if (!PREACTION(ms)) { |
4199 | result = sys_trim(ms, pad); |
4108 | result = sys_trim(ms, pad); |
4200 | POSTACTION(ms); |
4109 | POSTACTION(ms); |
4201 | } |
4110 | } |
4202 | } |
4111 | } |
4203 | else { |
4112 | else { |
4204 | USAGE_ERROR_ACTION(ms,ms); |
4113 | USAGE_ERROR_ACTION(ms,ms); |
4205 | } |
4114 | } |
4206 | return result; |
4115 | return result; |
4207 | } |
4116 | } |
4208 | 4117 | ||
4209 | void mspace_malloc_stats(mspace msp) { |
4118 | void mspace_malloc_stats(mspace msp) { |
4210 | mstate ms = (mstate)msp; |
4119 | mstate ms = (mstate)msp; |
4211 | if (ok_magic(ms)) { |
4120 | if (ok_magic(ms)) { |
4212 | internal_malloc_stats(ms); |
4121 | internal_malloc_stats(ms); |
4213 | } |
4122 | } |
4214 | else { |
4123 | else { |
4215 | USAGE_ERROR_ACTION(ms,ms); |
4124 | USAGE_ERROR_ACTION(ms,ms); |
4216 | } |
4125 | } |
4217 | } |
4126 | } |
4218 | 4127 | ||
4219 | size_t mspace_footprint(mspace msp) { |
4128 | size_t mspace_footprint(mspace msp) { |
4220 | size_t result; |
4129 | size_t result; |
4221 | mstate ms = (mstate)msp; |
4130 | mstate ms = (mstate)msp; |
4222 | if (ok_magic(ms)) { |
4131 | if (ok_magic(ms)) { |
4223 | result = ms->footprint; |
4132 | result = ms->footprint; |
4224 | } |
4133 | } |
4225 | USAGE_ERROR_ACTION(ms,ms); |
4134 | USAGE_ERROR_ACTION(ms,ms); |
4226 | return result; |
4135 | return result; |
4227 | } |
4136 | } |
4228 | 4137 | ||
4229 | 4138 | ||
4230 | size_t mspace_max_footprint(mspace msp) { |
4139 | size_t mspace_max_footprint(mspace msp) { |
4231 | size_t result; |
4140 | size_t result; |
4232 | mstate ms = (mstate)msp; |
4141 | mstate ms = (mstate)msp; |
4233 | if (ok_magic(ms)) { |
4142 | if (ok_magic(ms)) { |
4234 | result = ms->max_footprint; |
4143 | result = ms->max_footprint; |
4235 | } |
4144 | } |
4236 | USAGE_ERROR_ACTION(ms,ms); |
4145 | USAGE_ERROR_ACTION(ms,ms); |
4237 | return result; |
4146 | return result; |
4238 | } |
4147 | } |
4239 | 4148 | ||
4240 | 4149 | ||
4241 | #if !NO_MALLINFO |
4150 | #if !NO_MALLINFO |
4242 | struct mallinfo mspace_mallinfo(mspace msp) { |
4151 | struct mallinfo mspace_mallinfo(mspace msp) { |
4243 | mstate ms = (mstate)msp; |
4152 | mstate ms = (mstate)msp; |
4244 | if (!ok_magic(ms)) { |
4153 | if (!ok_magic(ms)) { |
4245 | USAGE_ERROR_ACTION(ms,ms); |
4154 | USAGE_ERROR_ACTION(ms,ms); |
4246 | } |
4155 | } |
4247 | return internal_mallinfo(ms); |
4156 | return internal_mallinfo(ms); |
4248 | } |
4157 | } |
4249 | #endif /* NO_MALLINFO */ |
4158 | #endif /* NO_MALLINFO */ |
4250 | 4159 | ||
4251 | int mspace_mallopt(int param_number, int value) { |
4160 | int mspace_mallopt(int param_number, int value) { |
4252 | return change_mparam(param_number, value); |
4161 | return change_mparam(param_number, value); |
4253 | } |
4162 | } |
4254 | 4163 | ||
4255 | #endif /* MSPACES */ |
4164 | #endif /* MSPACES */ |
4256 | 4165 | ||
4257 | /* -------------------- Alternative MORECORE functions ------------------- */ |
4166 | /* -------------------- Alternative MORECORE functions ------------------- */ |
4258 | 4167 | ||
4259 | /* |
4168 | /* |
4260 | Guidelines for creating a custom version of MORECORE: |
4169 | Guidelines for creating a custom version of MORECORE: |
4261 | 4170 | ||
4262 | * For best performance, MORECORE should allocate in multiples of pagesize. |
4171 | * For best performance, MORECORE should allocate in multiples of pagesize. |
4263 | * MORECORE may allocate more memory than requested. (Or even less, |
4172 | * MORECORE may allocate more memory than requested. (Or even less, |
4264 | but this will usually result in a malloc failure.) |
4173 | but this will usually result in a malloc failure.) |
4265 | * MORECORE must not allocate memory when given argument zero, but |
4174 | * MORECORE must not allocate memory when given argument zero, but |
4266 | instead return one past the end address of memory from previous |
4175 | instead return one past the end address of memory from previous |
4267 | nonzero call. |
4176 | nonzero call. |
4268 | * For best performance, consecutive calls to MORECORE with positive |
4177 | * For best performance, consecutive calls to MORECORE with positive |
4269 | arguments should return increasing addresses, indicating that |
4178 | arguments should return increasing addresses, indicating that |
4270 | space has been contiguously extended. |
4179 | space has been contiguously extended. |
4271 | * Even though consecutive calls to MORECORE need not return contiguous |
4180 | * Even though consecutive calls to MORECORE need not return contiguous |
4272 | addresses, it must be OK for malloc'ed chunks to span multiple |
4181 | addresses, it must be OK for malloc'ed chunks to span multiple |
4273 | regions in those cases where they do happen to be contiguous. |
4182 | regions in those cases where they do happen to be contiguous. |
4274 | * MORECORE need not handle negative arguments -- it may instead |
4183 | * MORECORE need not handle negative arguments -- it may instead |
4275 | just return MFAIL when given negative arguments. |
4184 | just return MFAIL when given negative arguments. |
4276 | Negative arguments are always multiples of pagesize. MORECORE |
4185 | Negative arguments are always multiples of pagesize. MORECORE |
4277 | must not misinterpret negative args as large positive unsigned |
4186 | must not misinterpret negative args as large positive unsigned |
4278 | args. You can suppress all such calls from even occurring by defining |
4187 | args. You can suppress all such calls from even occurring by defining |
4279 | MORECORE_CANNOT_TRIM, |
4188 | MORECORE_CANNOT_TRIM, |
4280 | 4189 | ||
4281 | As an example alternative MORECORE, here is a custom allocator |
4190 | As an example alternative MORECORE, here is a custom allocator |
4282 | kindly contributed for pre-OSX macOS. It uses virtually but not |
4191 | kindly contributed for pre-OSX macOS. It uses virtually but not |
4283 | necessarily physically contiguous non-paged memory (locked in, |
4192 | necessarily physically contiguous non-paged memory (locked in, |
4284 | present and won't get swapped out). You can use it by uncommenting |
4193 | present and won't get swapped out). You can use it by uncommenting |
4285 | this section, adding some #includes, and setting up the appropriate |
4194 | this section, adding some #includes, and setting up the appropriate |
4286 | defines above: |
4195 | defines above: |
4287 | 4196 | ||
4288 | #define MORECORE osMoreCore |
4197 | #define MORECORE osMoreCore |
4289 | 4198 | ||
4290 | There is also a shutdown routine that should somehow be called for |
4199 | There is also a shutdown routine that should somehow be called for |
4291 | cleanup upon program exit. |
4200 | cleanup upon program exit. |
4292 | 4201 | ||
4293 | #define MAX_POOL_ENTRIES 100 |
4202 | #define MAX_POOL_ENTRIES 100 |
4294 | #define MINIMUM_MORECORE_SIZE (64 * 1024U) |
4203 | #define MINIMUM_MORECORE_SIZE (64 * 1024U) |
4295 | static int next_os_pool; |
4204 | static int next_os_pool; |
4296 | void *our_os_pools[MAX_POOL_ENTRIES]; |
4205 | void *our_os_pools[MAX_POOL_ENTRIES]; |
4297 | 4206 | ||
4298 | void *osMoreCore(int size) |
4207 | void *osMoreCore(int size) |
4299 | { |
4208 | { |
4300 | void *ptr = 0; |
4209 | void *ptr = 0; |
4301 | static void *sbrk_top = 0; |
4210 | static void *sbrk_top = 0; |
4302 | 4211 | ||
4303 | if (size > 0) |
4212 | if (size > 0) |
4304 | { |
4213 | { |
4305 | if (size < MINIMUM_MORECORE_SIZE) |
4214 | if (size < MINIMUM_MORECORE_SIZE) |
4306 | size = MINIMUM_MORECORE_SIZE; |
4215 | size = MINIMUM_MORECORE_SIZE; |
4307 | if (CurrentExecutionLevel() == kTaskLevel) |
4216 | if (CurrentExecutionLevel() == kTaskLevel) |
4308 | ptr = PoolAllocateResident(size + RM_PAGE_SIZE, 0); |
4217 | ptr = PoolAllocateResident(size + RM_PAGE_SIZE, 0); |
4309 | if (ptr == 0) |
4218 | if (ptr == 0) |
4310 | { |
4219 | { |
4311 | return (void *) MFAIL; |
4220 | return (void *) MFAIL; |
4312 | } |
4221 | } |
4313 | // save ptrs so they can be freed during cleanup |
4222 | // save ptrs so they can be freed during cleanup |
4314 | our_os_pools[next_os_pool] = ptr; |
4223 | our_os_pools[next_os_pool] = ptr; |
4315 | next_os_pool++; |
4224 | next_os_pool++; |
4316 | ptr = (void *) ((((size_t) ptr) + RM_PAGE_MASK) & ~RM_PAGE_MASK); |
4225 | ptr = (void *) ((((size_t) ptr) + RM_PAGE_MASK) & ~RM_PAGE_MASK); |
4317 | sbrk_top = (char *) ptr + size; |
4226 | sbrk_top = (char *) ptr + size; |
4318 | return ptr; |
4227 | return ptr; |
4319 | } |
4228 | } |
4320 | else if (size < 0) |
4229 | else if (size < 0) |
4321 | { |
4230 | { |
4322 | // we don't currently support shrink behavior |
4231 | // we don't currently support shrink behavior |
4323 | return (void *) MFAIL; |
4232 | return (void *) MFAIL; |
4324 | } |
4233 | } |
4325 | else |
4234 | else |
4326 | { |
4235 | { |
4327 | return sbrk_top; |
4236 | return sbrk_top; |
4328 | } |
4237 | } |
4329 | } |
4238 | } |
4330 | 4239 | ||
4331 | // cleanup any allocated memory pools |
4240 | // cleanup any allocated memory pools |
4332 | // called as last thing before shutting down driver |
4241 | // called as last thing before shutting down driver |
4333 | 4242 | ||
4334 | void osCleanupMem(void) |
4243 | void osCleanupMem(void) |
4335 | { |
4244 | { |
4336 | void **ptr; |
4245 | void **ptr; |
4337 | 4246 | ||
4338 | for (ptr = our_os_pools; ptr < &our_os_pools[MAX_POOL_ENTRIES]; ptr++) |
4247 | for (ptr = our_os_pools; ptr < &our_os_pools[MAX_POOL_ENTRIES]; ptr++) |
4339 | if (*ptr) |
4248 | if (*ptr) |
4340 | { |
4249 | { |
4341 | PoolDeallocate(*ptr); |
4250 | PoolDeallocate(*ptr); |
4342 | *ptr = 0; |
4251 | *ptr = 0; |
4343 | } |
4252 | } |
4344 | } |
4253 | } |
4345 | 4254 | ||
4346 | */ |
4255 | */ |
4347 | 4256 | ||
4348 | 4257 | ||
4349 | /* ----------------------------------------------------------------------- |
4258 | /* ----------------------------------------------------------------------- |
4350 | History: |
4259 | History: |
4351 | V2.8.3 Thu Sep 22 11:16:32 2005 Doug Lea (dl at gee) |
4260 | V2.8.3 Thu Sep 22 11:16:32 2005 Doug Lea (dl at gee) |
4352 | * Add max_footprint functions |
4261 | * Add max_footprint functions |
4353 | * Ensure all appropriate literals are size_t |
4262 | * Ensure all appropriate literals are size_t |
4354 | * Fix conditional compilation problem for some #define settings |
4263 | * Fix conditional compilation problem for some #define settings |
4355 | * Avoid concatenating segments with the one provided |
4264 | * Avoid concatenating segments with the one provided |
4356 | in create_mspace_with_base |
4265 | in create_mspace_with_base |
4357 | * Rename some variables to avoid compiler shadowing warnings |
4266 | * Rename some variables to avoid compiler shadowing warnings |
4358 | * Use explicit lock initialization. |
4267 | * Use explicit lock initialization. |
4359 | * Better handling of sbrk interference. |
4268 | * Better handling of sbrk interference. |
4360 | * Simplify and fix segment insertion, trimming and mspace_destroy |
4269 | * Simplify and fix segment insertion, trimming and mspace_destroy |
4361 | * Reinstate REALLOC_ZERO_BYTES_FREES option from 2.7.x |
4270 | * Reinstate REALLOC_ZERO_BYTES_FREES option from 2.7.x |
4362 | * Thanks especially to Dennis Flanagan for help on these. |
4271 | * Thanks especially to Dennis Flanagan for help on these. |
4363 | 4272 | ||
4364 | V2.8.2 Sun Jun 12 16:01:10 2005 Doug Lea (dl at gee) |
4273 | V2.8.2 Sun Jun 12 16:01:10 2005 Doug Lea (dl at gee) |
4365 | * Fix memalign brace error. |
4274 | * Fix memalign brace error. |
4366 | 4275 | ||
4367 | V2.8.1 Wed Jun 8 16:11:46 2005 Doug Lea (dl at gee) |
4276 | V2.8.1 Wed Jun 8 16:11:46 2005 Doug Lea (dl at gee) |
4368 | * Fix improper #endif nesting in C++ |
4277 | * Fix improper #endif nesting in C++ |
4369 | * Add explicit casts needed for C++ |
4278 | * Add explicit casts needed for C++ |
4370 | 4279 | ||
4371 | V2.8.0 Mon May 30 14:09:02 2005 Doug Lea (dl at gee) |
4280 | V2.8.0 Mon May 30 14:09:02 2005 Doug Lea (dl at gee) |
4372 | * Use trees for large bins |
4281 | * Use trees for large bins |
4373 | * Support mspaces |
4282 | * Support mspaces |
4374 | * Use segments to unify sbrk-based and mmap-based system allocation, |
4283 | * Use segments to unify sbrk-based and mmap-based system allocation, |
4375 | removing need for emulation on most platforms without sbrk. |
4284 | removing need for emulation on most platforms without sbrk. |
4376 | * Default safety checks |
4285 | * Default safety checks |
4377 | * Optional footer checks. Thanks to William Robertson for the idea. |
4286 | * Optional footer checks. Thanks to William Robertson for the idea. |
4378 | * Internal code refactoring |
4287 | * Internal code refactoring |
4379 | * Incorporate suggestions and platform-specific changes. |
4288 | * Incorporate suggestions and platform-specific changes. |
4380 | Thanks to Dennis Flanagan, Colin Plumb, Niall Douglas, |
4289 | Thanks to Dennis Flanagan, Colin Plumb, Niall Douglas, |
4381 | Aaron Bachmann, Emery Berger, and others. |
4290 | Aaron Bachmann, Emery Berger, and others. |
4382 | * Speed up non-fastbin processing enough to remove fastbins. |
4291 | * Speed up non-fastbin processing enough to remove fastbins. |
4383 | * Remove useless cfree() to avoid conflicts with other apps. |
4292 | * Remove useless cfree() to avoid conflicts with other apps. |
4384 | * Remove internal memcpy, memset. Compilers handle builtins better. |
4293 | * Remove internal memcpy, memset. Compilers handle builtins better. |
4385 | * Remove some options that no one ever used and rename others. |
4294 | * Remove some options that no one ever used and rename others. |
4386 | 4295 | ||
4387 | V2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee) |
4296 | V2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee) |
4388 | * Fix malloc_state bitmap array misdeclaration |
4297 | * Fix malloc_state bitmap array misdeclaration |
4389 | 4298 | ||
4390 | V2.7.1 Thu Jul 25 10:58:03 2002 Doug Lea (dl at gee) |
4299 | V2.7.1 Thu Jul 25 10:58:03 2002 Doug Lea (dl at gee) |
4391 | * Allow tuning of FIRST_SORTED_BIN_SIZE |
4300 | * Allow tuning of FIRST_SORTED_BIN_SIZE |
4392 | * Use PTR_UINT as type for all ptr->int casts. Thanks to John Belmonte. |
4301 | * Use PTR_UINT as type for all ptr->int casts. Thanks to John Belmonte. |
4393 | * Better detection and support for non-contiguousness of MORECORE. |
4302 | * Better detection and support for non-contiguousness of MORECORE. |
4394 | Thanks to Andreas Mueller, Conal Walsh, and Wolfram Gloger |
4303 | Thanks to Andreas Mueller, Conal Walsh, and Wolfram Gloger |
4395 | * Bypass most of malloc if no frees. Thanks To Emery Berger. |
4304 | * Bypass most of malloc if no frees. Thanks To Emery Berger. |
4396 | * Fix freeing of old top non-contiguous chunk im sysmalloc. |
4305 | * Fix freeing of old top non-contiguous chunk im sysmalloc. |
4397 | * Raised default trim and map thresholds to 256K. |
4306 | * Raised default trim and map thresholds to 256K. |
4398 | * Fix mmap-related #defines. Thanks to Lubos Lunak. |
4307 | * Fix mmap-related #defines. Thanks to Lubos Lunak. |
4399 | * Fix copy macros; added LACKS_FCNTL_H. Thanks to Neal Walfield. |
4308 | * Fix copy macros; added LACKS_FCNTL_H. Thanks to Neal Walfield. |
4400 | * Branch-free bin calculation |
4309 | * Branch-free bin calculation |
4401 | * Default trim and mmap thresholds now 256K. |
4310 | * Default trim and mmap thresholds now 256K. |
4402 | 4311 | ||
4403 | V2.7.0 Sun Mar 11 14:14:06 2001 Doug Lea (dl at gee) |
4312 | V2.7.0 Sun Mar 11 14:14:06 2001 Doug Lea (dl at gee) |
4404 | * Introduce independent_comalloc and independent_calloc. |
4313 | * Introduce independent_comalloc and independent_calloc. |
4405 | Thanks to Michael Pachos for motivation and help. |
4314 | Thanks to Michael Pachos for motivation and help. |
4406 | * Make optional .h file available |
4315 | * Make optional .h file available |
4407 | * Allow > 2GB requests on 32bit systems. |
4316 | * Allow > 2GB requests on 32bit systems. |
4408 | * new WIN32 sbrk, mmap, munmap, lock code from <Walter@GeNeSys-e.de>. |
4317 | * new WIN32 sbrk, mmap, munmap, lock code from <Walter@GeNeSys-e.de>. |
4409 | Thanks also to Andreas Mueller <a.mueller at paradatec.de>, |
4318 | Thanks also to Andreas Mueller <a.mueller at paradatec.de>, |
4410 | and Anonymous. |
4319 | and Anonymous. |
4411 | * Allow override of MALLOC_ALIGNMENT (Thanks to Ruud Waij for |
4320 | * Allow override of MALLOC_ALIGNMENT (Thanks to Ruud Waij for |
4412 | helping test this.) |
4321 | helping test this.) |
4413 | * memalign: check alignment arg |
4322 | * memalign: check alignment arg |
4414 | * realloc: don't try to shift chunks backwards, since this |
4323 | * realloc: don't try to shift chunks backwards, since this |
4415 | leads to more fragmentation in some programs and doesn't |
4324 | leads to more fragmentation in some programs and doesn't |
4416 | seem to help in any others. |
4325 | seem to help in any others. |
4417 | * Collect all cases in malloc requiring system memory into sysmalloc |
4326 | * Collect all cases in malloc requiring system memory into sysmalloc |
4418 | * Use mmap as backup to sbrk |
4327 | * Use mmap as backup to sbrk |
4419 | * Place all internal state in malloc_state |
4328 | * Place all internal state in malloc_state |
4420 | * Introduce fastbins (although similar to 2.5.1) |
4329 | * Introduce fastbins (although similar to 2.5.1) |
4421 | * Many minor tunings and cosmetic improvements |
4330 | * Many minor tunings and cosmetic improvements |
4422 | * Introduce USE_PUBLIC_MALLOC_WRAPPERS, USE_MALLOC_LOCK |
4331 | * Introduce USE_PUBLIC_MALLOC_WRAPPERS, USE_MALLOC_LOCK |
4423 | * Introduce MALLOC_FAILURE_ACTION, MORECORE_CONTIGUOUS |
4332 | * Introduce MALLOC_FAILURE_ACTION, MORECORE_CONTIGUOUS |
4424 | Thanks to Tony E. Bennett <tbennett@nvidia.com> and others. |
4333 | Thanks to Tony E. Bennett <tbennett@nvidia.com> and others. |
4425 | * Include errno.h to support default failure action. |
4334 | * Include errno.h to support default failure action. |
4426 | 4335 | ||
4427 | V2.6.6 Sun Dec 5 07:42:19 1999 Doug Lea (dl at gee) |
4336 | V2.6.6 Sun Dec 5 07:42:19 1999 Doug Lea (dl at gee) |
4428 | * return null for negative arguments |
4337 | * return null for negative arguments |
4429 | * Added Several WIN32 cleanups from Martin C. Fong <mcfong at yahoo.com> |
4338 | * Added Several WIN32 cleanups from Martin C. Fong <mcfong at yahoo.com> |
4430 | * Add 'LACKS_SYS_PARAM_H' for those systems without 'sys/param.h' |
4339 | * Add 'LACKS_SYS_PARAM_H' for those systems without 'sys/param.h' |
4431 | (e.g. WIN32 platforms) |
4340 | (e.g. WIN32 platforms) |
4432 | * Cleanup header file inclusion for WIN32 platforms |
4341 | * Cleanup header file inclusion for WIN32 platforms |
4433 | * Cleanup code to avoid Microsoft Visual C++ compiler complaints |
4342 | * Cleanup code to avoid Microsoft Visual C++ compiler complaints |
4434 | * Add 'USE_DL_PREFIX' to quickly allow co-existence with existing |
4343 | * Add 'USE_DL_PREFIX' to quickly allow co-existence with existing |
4435 | memory allocation routines |
4344 | memory allocation routines |
4436 | * Set 'malloc_getpagesize' for WIN32 platforms (needs more work) |
4345 | * Set 'malloc_getpagesize' for WIN32 platforms (needs more work) |
4437 | * Use 'assert' rather than 'ASSERT' in WIN32 code to conform to |
4346 | * Use 'assert' rather than 'ASSERT' in WIN32 code to conform to |
4438 | usage of 'assert' in non-WIN32 code |
4347 | usage of 'assert' in non-WIN32 code |
4439 | * Improve WIN32 'sbrk()' emulation's 'findRegion()' routine to |
4348 | * Improve WIN32 'sbrk()' emulation's 'findRegion()' routine to |
4440 | avoid infinite loop |
4349 | avoid infinite loop |
4441 | * Always call 'fREe()' rather than 'free()' |
4350 | * Always call 'fREe()' rather than 'free()' |
4442 | 4351 | ||
4443 | V2.6.5 Wed Jun 17 15:57:31 1998 Doug Lea (dl at gee) |
4352 | V2.6.5 Wed Jun 17 15:57:31 1998 Doug Lea (dl at gee) |
4444 | * Fixed ordering problem with boundary-stamping |
4353 | * Fixed ordering problem with boundary-stamping |
4445 | 4354 | ||
4446 | V2.6.3 Sun May 19 08:17:58 1996 Doug Lea (dl at gee) |
4355 | V2.6.3 Sun May 19 08:17:58 1996 Doug Lea (dl at gee) |
4447 | * Added pvalloc, as recommended by H.J. Liu |
4356 | * Added pvalloc, as recommended by H.J. Liu |
4448 | * Added 64bit pointer support mainly from Wolfram Gloger |
4357 | * Added 64bit pointer support mainly from Wolfram Gloger |
4449 | * Added anonymously donated WIN32 sbrk emulation |
4358 | * Added anonymously donated WIN32 sbrk emulation |
4450 | * Malloc, calloc, getpagesize: add optimizations from Raymond Nijssen |
4359 | * Malloc, calloc, getpagesize: add optimizations from Raymond Nijssen |
4451 | * malloc_extend_top: fix mask error that caused wastage after |
4360 | * malloc_extend_top: fix mask error that caused wastage after |
4452 | foreign sbrks |
4361 | foreign sbrks |
4453 | * Add linux mremap support code from HJ Liu |
4362 | * Add linux mremap support code from HJ Liu |
4454 | 4363 | ||
4455 | V2.6.2 Tue Dec 5 06:52:55 1995 Doug Lea (dl at gee) |
4364 | V2.6.2 Tue Dec 5 06:52:55 1995 Doug Lea (dl at gee) |
4456 | * Integrated most documentation with the code. |
4365 | * Integrated most documentation with the code. |
4457 | * Add support for mmap, with help from |
4366 | * Add support for mmap, with help from |
4458 | Wolfram Gloger (Gloger@lrz.uni-muenchen.de). |
4367 | Wolfram Gloger (Gloger@lrz.uni-muenchen.de). |
4459 | * Use last_remainder in more cases. |
4368 | * Use last_remainder in more cases. |
4460 | * Pack bins using idea from colin@nyx10.cs.du.edu |
4369 | * Pack bins using idea from colin@nyx10.cs.du.edu |
4461 | * Use ordered bins instead of best-fit threshhold |
4370 | * Use ordered bins instead of best-fit threshhold |
4462 | * Eliminate block-local decls to simplify tracing and debugging. |
4371 | * Eliminate block-local decls to simplify tracing and debugging. |
4463 | * Support another case of realloc via move into top |
4372 | * Support another case of realloc via move into top |
4464 | * Fix error occuring when initial sbrk_base not word-aligned. |
4373 | * Fix error occuring when initial sbrk_base not word-aligned. |
4465 | * Rely on page size for units instead of SBRK_UNIT to |
4374 | * Rely on page size for units instead of SBRK_UNIT to |
4466 | avoid surprises about sbrk alignment conventions. |
4375 | avoid surprises about sbrk alignment conventions. |
4467 | * Add mallinfo, mallopt. Thanks to Raymond Nijssen |
4376 | * Add mallinfo, mallopt. Thanks to Raymond Nijssen |
4468 | (raymond@es.ele.tue.nl) for the suggestion. |
4377 | (raymond@es.ele.tue.nl) for the suggestion. |
4469 | * Add `pad' argument to malloc_trim and top_pad mallopt parameter. |
4378 | * Add `pad' argument to malloc_trim and top_pad mallopt parameter. |
4470 | * More precautions for cases where other routines call sbrk, |
4379 | * More precautions for cases where other routines call sbrk, |
4471 | courtesy of Wolfram Gloger (Gloger@lrz.uni-muenchen.de). |
4380 | courtesy of Wolfram Gloger (Gloger@lrz.uni-muenchen.de). |
4472 | * Added macros etc., allowing use in linux libc from |
4381 | * Added macros etc., allowing use in linux libc from |
4473 | H.J. Lu (hjl@gnu.ai.mit.edu) |
4382 | H.J. Lu (hjl@gnu.ai.mit.edu) |
4474 | * Inverted this history list |
4383 | * Inverted this history list |
4475 | 4384 | ||
4476 | V2.6.1 Sat Dec 2 14:10:57 1995 Doug Lea (dl at gee) |
4385 | V2.6.1 Sat Dec 2 14:10:57 1995 Doug Lea (dl at gee) |
4477 | * Re-tuned and fixed to behave more nicely with V2.6.0 changes. |
4386 | * Re-tuned and fixed to behave more nicely with V2.6.0 changes. |
4478 | * Removed all preallocation code since under current scheme |
4387 | * Removed all preallocation code since under current scheme |
4479 | the work required to undo bad preallocations exceeds |
4388 | the work required to undo bad preallocations exceeds |
4480 | the work saved in good cases for most test programs. |
4389 | the work saved in good cases for most test programs. |
4481 | * No longer use return list or unconsolidated bins since |
4390 | * No longer use return list or unconsolidated bins since |
4482 | no scheme using them consistently outperforms those that don't |
4391 | no scheme using them consistently outperforms those that don't |
4483 | given above changes. |
4392 | given above changes. |
4484 | * Use best fit for very large chunks to prevent some worst-cases. |
4393 | * Use best fit for very large chunks to prevent some worst-cases. |
4485 | * Added some support for debugging |
4394 | * Added some support for debugging |
4486 | 4395 | ||
4487 | V2.6.0 Sat Nov 4 07:05:23 1995 Doug Lea (dl at gee) |
4396 | V2.6.0 Sat Nov 4 07:05:23 1995 Doug Lea (dl at gee) |
4488 | * Removed footers when chunks are in use. Thanks to |
4397 | * Removed footers when chunks are in use. Thanks to |
4489 | Paul Wilson (wilson@cs.texas.edu) for the suggestion. |
4398 | Paul Wilson (wilson@cs.texas.edu) for the suggestion. |
4490 | 4399 | ||
4491 | V2.5.4 Wed Nov 1 07:54:51 1995 Doug Lea (dl at gee) |
4400 | V2.5.4 Wed Nov 1 07:54:51 1995 Doug Lea (dl at gee) |
4492 | * Added malloc_trim, with help from Wolfram Gloger |
4401 | * Added malloc_trim, with help from Wolfram Gloger |
4493 | (wmglo@Dent.MED.Uni-Muenchen.DE). |
4402 | (wmglo@Dent.MED.Uni-Muenchen.DE). |
4494 | 4403 | ||
4495 | V2.5.3 Tue Apr 26 10:16:01 1994 Doug Lea (dl at g) |
4404 | V2.5.3 Tue Apr 26 10:16:01 1994 Doug Lea (dl at g) |
4496 | 4405 | ||
4497 | V2.5.2 Tue Apr 5 16:20:40 1994 Doug Lea (dl at g) |
4406 | V2.5.2 Tue Apr 5 16:20:40 1994 Doug Lea (dl at g) |
4498 | * realloc: try to expand in both directions |
4407 | * realloc: try to expand in both directions |
4499 | * malloc: swap order of clean-bin strategy; |
4408 | * malloc: swap order of clean-bin strategy; |
4500 | * realloc: only conditionally expand backwards |
4409 | * realloc: only conditionally expand backwards |
4501 | * Try not to scavenge used bins |
4410 | * Try not to scavenge used bins |
4502 | * Use bin counts as a guide to preallocation |
4411 | * Use bin counts as a guide to preallocation |
4503 | * Occasionally bin return list chunks in first scan |
4412 | * Occasionally bin return list chunks in first scan |
4504 | * Add a few optimizations from colin@nyx10.cs.du.edu |
4413 | * Add a few optimizations from colin@nyx10.cs.du.edu |
4505 | 4414 | ||
4506 | V2.5.1 Sat Aug 14 15:40:43 1993 Doug Lea (dl at g) |
4415 | V2.5.1 Sat Aug 14 15:40:43 1993 Doug Lea (dl at g) |
4507 | * faster bin computation & slightly different binning |
4416 | * faster bin computation & slightly different binning |
4508 | * merged all consolidations to one part of malloc proper |
4417 | * merged all consolidations to one part of malloc proper |
4509 | (eliminating old malloc_find_space & malloc_clean_bin) |
4418 | (eliminating old malloc_find_space & malloc_clean_bin) |
4510 | * Scan 2 returns chunks (not just 1) |
4419 | * Scan 2 returns chunks (not just 1) |
4511 | * Propagate failure in realloc if malloc returns 0 |
4420 | * Propagate failure in realloc if malloc returns 0 |
4512 | * Add stuff to allow compilation on non-ANSI compilers |
4421 | * Add stuff to allow compilation on non-ANSI compilers |
4513 | from kpv@research.att.com |
4422 | from kpv@research.att.com |
4514 | 4423 | ||
4515 | V2.5 Sat Aug 7 07:41:59 1993 Doug Lea (dl at g.oswego.edu) |
4424 | V2.5 Sat Aug 7 07:41:59 1993 Doug Lea (dl at g.oswego.edu) |
4516 | * removed potential for odd address access in prev_chunk |
4425 | * removed potential for odd address access in prev_chunk |
4517 | * removed dependency on getpagesize.h |
4426 | * removed dependency on getpagesize.h |
4518 | * misc cosmetics and a bit more internal documentation |
4427 | * misc cosmetics and a bit more internal documentation |
4519 | * anticosmetics: mangled names in macros to evade debugger strangeness |
4428 | * anticosmetics: mangled names in macros to evade debugger strangeness |
4520 | * tested on sparc, hp-700, dec-mips, rs6000 |
4429 | * tested on sparc, hp-700, dec-mips, rs6000 |
4521 | with gcc & native cc (hp, dec only) allowing |
4430 | with gcc & native cc (hp, dec only) allowing |
4522 | Detlefs & Zorn comparison study (in SIGPLAN Notices.) |
4431 | Detlefs & Zorn comparison study (in SIGPLAN Notices.) |
4523 | 4432 | ||
4524 | Trial version Fri Aug 28 13:14:29 1992 Doug Lea (dl at g.oswego.edu) |
4433 | Trial version Fri Aug 28 13:14:29 1992 Doug Lea (dl at g.oswego.edu) |
4525 | * Based loosely on libg++-1.2X malloc. (It retains some of the overall |
4434 | * Based loosely on libg++-1.2X malloc. (It retains some of the overall |
4526 | structure of old version, but most details differ.) |
4435 | structure of old version, but most details differ.) |
4527 | |
4436 | |
4528 | */ |
4437 | */ |
4529 | 4438 |