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/*
 * Copyright (c) 2005 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup genericdebug
 * @{
 */

/**
 * @file
 * @brief Kernel symbol resolver.
 */

#include <symtab.h>
#include <byteorder.h>
#include <string.h>
#include <print.h>
#include <arch/types.h>
#include <typedefs.h>
#include <errno.h>

/** Get name of a symbol that seems most likely to correspond to address.
 *
 * @param addr Address.
 * @param name Place to store pointer to the symbol name.
 *
 * @return Zero on success or negative error code, ENOENT if not found,
 *         ENOTSUP if symbol table not available.
 *
 */
int symtab_name_lookup(unative_t addr, char **name)
{
#ifdef CONFIG_SYMTAB
    count_t i;
    
    for (i = 1; symbol_table[i].address_le; i++) {
        if (addr < uint64_t_le2host(symbol_table[i].address_le))
            break;
    }
    
    if (addr >= uint64_t_le2host(symbol_table[i - 1].address_le)) {
        *name = symbol_table[i - 1].symbol_name;
        return EOK;
    }
    
    *name = NULL;
    return ENOENT;
    
#else
    *name = NULL;
    return ENOTSUP;
#endif
}

/** Lookup symbol by address and format for display.
 *
 * Returns name of closest corresponding symbol, "Not found" if none exists
 * or "N/A" if no symbol information is available.
 *
 * @param addr Address.
 * @param name Place to store pointer to the symbol name.
 *
 * @return Pointer to a human-readable string.
 *
 */
char *symtab_fmt_name_lookup(unative_t addr)
{
    char *name;
    int rc = symtab_name_lookup(addr, &name);
    
    switch (rc) {
    case EOK:
        return name;
    case ENOENT:
        return "Not found";
    default:
        return "N/A";
    }
}

#ifdef CONFIG_SYMTAB

/** Find symbols that match the parameter forward and print them.
 *
 * @param name     Search string
 * @param startpos Starting position, changes to found position
 *
 * @return Pointer to the part of string that should be completed or NULL.
 *
 */
static const char *symtab_search_one(const char *name, count_t *startpos)
{
    count_t namelen = str_length(name);
    
    count_t pos;
    for (pos = *startpos; symbol_table[pos].address_le; pos++) {
        const char *curname = symbol_table[pos].symbol_name;
        
        /* Find a ':' in name */
        const char *colon = str_chr(curname, ':');
        if (colon == NULL)
            continue;
        
        if (str_length(curname) < namelen)
            continue;
        
        if (str_lcmp(name, curname, namelen) == 0) {
            *startpos = pos;
            return (curname + str_lsize(curname, namelen));
        }
    }
    
    return NULL;
}

#endif

/** Return address that corresponds to the entry.
 *
 * Search symbol table, and if there is one match, return it
 *
 * @param name Name of the symbol
 * @param addr Place to store symbol address
 *
 * @return Zero on success, ENOENT - not found, EOVERFLOW - duplicate
 *         symbol, ENOTSUP - no symbol information available.
 *
 */
int symtab_addr_lookup(const char *name, uintptr_t *addr)
{
#ifdef CONFIG_SYMTAB
    count_t found = 0;
    count_t pos = 0;
    const char *hint;
    
    while ((hint = symtab_search_one(name, &pos))) {
        if (str_length(hint) == 0) {
            *addr = uint64_t_le2host(symbol_table[pos].address_le);
            found++;
        }
        pos++;
    }
    
    if (found > 1)
        return EOVERFLOW;
    
    if (found < 1)
        return ENOENT;
    
    return EOK;
    
#else
    return ENOTSUP;
#endif
}

/** Find symbols that match parameter and print them */
void symtab_print_search(const char *name)
{
#ifdef CONFIG_SYMTAB
    count_t pos = 0;
    while (symtab_search_one(name, &pos)) {
        uintptr_t addr = uint64_t_le2host(symbol_table[pos].address_le);
        char *realname = symbol_table[pos].symbol_name;
        printf("%p: %s\n", addr, realname);
        pos++;
    }
    
#else
    printf("No symbol information available.\n");
#endif
}

/** Symtab completion
 *
 * @param input Search string, completes to symbol name
 * @param size  Input buffer size
 *
 * @return 0 - nothing found, 1 - success, >1 print duplicates
 *
 */
int symtab_compl(char *input, count_t size)
{
#ifdef CONFIG_SYMTAB
    const char *name = input;
    
    /* Allow completion of pointers */
    if ((name[0] == '*') || (name[0] == '&'))
        name++;
    
    /* Do not print all symbols */
    if (str_length(name) == 0)
        return 0;
    
    count_t found = 0;
    count_t pos = 0;
    const char *hint;
    char output[MAX_SYMBOL_NAME];
    
    output[0] = 0;
    
    while ((hint = symtab_search_one(name, &pos))) {
        if ((found == 0) || (str_length(output) > str_length(hint)))
            str_cpy(output, MAX_SYMBOL_NAME, hint);
        
        pos++;
        found++;
    }
    
    if ((found > 1) && (str_length(output) != 0)) {
        printf("\n");
        pos = 0;
        while ((hint = symtab_search_one(name, &pos))) {
            printf("%s\n", symbol_table[pos].symbol_name);
            pos++;
        }
    }
    
    if (found > 0)
        str_cpy(input, size, output);
    
    return found;
    
#else
    return 0;
#endif
}

/** @}
 */