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/* nautilus-leak-symbol-lookup.C - symbol lookup for a leak checking and profiling
library
Copyright (C) 2000 Eazel
The Gnome Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The Gnome Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the Gnome Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Author: Pavel Cisler <pavel@eazel.com>
*/
/* Copied from the leakchecker with a few minor tweaks.
* FIXME: need to consolidate this with the leakchecker version and
* only have one copy for both
*/
#define _GNU_SOURCE
/* need this for dladdr */
#include "nautilus-leak-symbol-lookup.h"
#include <bfd.h>
#include <dlfcn.h>
#include <glib.h>
#include <stdio.h>
#include <malloc.h>
#include <unistd.h>
#include <sys/stat.h>
static GList *symbol_table_list;
typedef struct {
char *path;
bfd *abfd;
asymbol **symbol_table;
asection *text_section;
unsigned long start;
unsigned long end;
} NautilusLeakSymbolLookupMap;
static gboolean
nautilus_leak_find_symbol_in_map (const NautilusLeakSymbolLookupMap *map,
unsigned long address, char **function_name, char **source_file_name,
unsigned int *line)
{
const char *file;
const char *function;
address -= map->start;
address -= map->text_section->vma;
if (address > map->text_section->_cooked_size) {
/* not a valid address range for this binary */
return FALSE;
}
if (!bfd_find_nearest_line (map->abfd, map->text_section, map->symbol_table,
address,
&file, &function, line)) {
printf ("error looking up address in binary %s\n", map->path);
return FALSE;
}
if (file == NULL || function == NULL) {
return FALSE;
}
*function_name = g_strdup (function);
*source_file_name = g_strdup (file);
return TRUE;
}
static void
nautilus_leak_symbol_map_get_offsets (NautilusLeakSymbolLookupMap *map)
{
gchar buffer[1024];
FILE *in;
gchar perms[26];
gchar file[256];
unsigned long start, end;
guint major, minor;
ino_t inode;
struct stat library_stat;
struct stat entry_stat;
int count;
/* find the library we are looking for in the proc directories
* to find out at which addresses it is mapped
*/
snprintf (buffer, 1023, "/proc/%d/maps", getpid());
in = fopen (buffer, "r");
if (stat (map->path, &library_stat) != 0) {
/* we will use st_ino and st_dev to do a file match */
return;
}
while (fgets(buffer, 1023, in)) {
gulong tmp;
count = sscanf (buffer, "%lx-%lx %15s %*x %u:%u %lu %255s",
&start, &end, perms, &major, &minor, &tmp, file);
inode = tmp;
if (count >= 6 && strcmp (perms, "r-xp") == 0) {
if (stat (file, &entry_stat) != 0) {
break;
}
/* check if this is the library we are loading */
if (library_stat.st_ino == entry_stat.st_ino
&& library_stat.st_dev == entry_stat.st_dev) {
map->start = start;
map->end = end;
break;
}
}
}
fclose (in);
}
static NautilusLeakSymbolLookupMap *
nautilus_leak_symbol_map_load (const char *binary_path, gboolean executable)
{
NautilusLeakSymbolLookupMap *map;
char *target = NULL;
size_t storage_needed;
int number_of_symbols;
map = g_new0 (NautilusLeakSymbolLookupMap, 1);
map->abfd = bfd_openr (binary_path, target);
if (map->abfd == NULL) {
fprintf (stderr, "%s: ", binary_path);
bfd_perror (binary_path);
return NULL;
}
if (!bfd_check_format (map->abfd, bfd_object)) {
fprintf (stderr, "%s is not an object file\n", binary_path);
bfd_close (map->abfd);
return NULL;
}
/* Use the ".text" section. */
map->text_section = bfd_get_section_by_name (map->abfd, ".text");
/* Read the symbol table. */
storage_needed = bfd_get_symtab_upper_bound (map->abfd);
if (storage_needed == 0) {
fprintf (stderr, "no symbols\n");
bfd_close (map->abfd);
return NULL;
}
map->symbol_table = (asymbol **)g_malloc (storage_needed);
if (map->symbol_table == NULL) {
fprintf (stderr, "no memory allocating symbol table\n");
bfd_close (map->abfd);
return NULL;
}
number_of_symbols = bfd_canonicalize_symtab (map->abfd, map->symbol_table);
map->path = g_strdup (binary_path);
if (!executable) {
nautilus_leak_symbol_map_get_offsets (map);
}
symbol_table_list = g_list_append (symbol_table_list, map);
return map;
}
static NautilusLeakSymbolLookupMap *
nautilus_leak_symbol_map_load_if_needed (const char *binary_path, gboolean executable)
{
GList *p;
NautilusLeakSymbolLookupMap *map;
for (p = symbol_table_list; p != NULL; p = p->next) {
map = (NautilusLeakSymbolLookupMap *)p->data;
if (strcmp (map->path, binary_path) == 0)
/* no need to load the symbols, already got the map */
return map;
}
return nautilus_leak_symbol_map_load (binary_path, executable);
}
void
nautilus_leak_print_symbol_cleanup (void)
{
/* free the cached symbol tables */
GList *p;
NautilusLeakSymbolLookupMap *map;
for (p = symbol_table_list; p != NULL; p = p->next) {
map = (NautilusLeakSymbolLookupMap *)p->data;
bfd_close (map->abfd);
g_free (map->symbol_table);
g_free (map->path);
g_free (map);
}
g_list_free (symbol_table_list);
symbol_table_list = NULL;
}
static gboolean
nautilus_leak_find_symbol_address (void *address, char **function_name, char **source_file_name,
int *line)
{
GList *p;
NautilusLeakSymbolLookupMap *map;
Dl_info info;
if (dladdr (address, &info) != 0) {
/* We know the function name and the binary it lives in, now try to find
* the function and the offset.
*/
map = nautilus_leak_symbol_map_load_if_needed (info.dli_fname, false);
/* temporarily force a dladdr-only lookup.
* should make the bfd symbol lookup work.
*/
if (map != NULL
&& nautilus_leak_find_symbol_in_map (map, (long)address,
function_name, source_file_name, (unsigned int *)line)) {
return TRUE;
}
/* just return the function name and the library binary path */
*function_name = g_strdup (info.dli_sname);
*source_file_name = g_strdup (info.dli_fname);
*line = -1;
return TRUE;
} else {
/* Usually dladdr will succeed, it seems to only fail for
* address lookups for functions in the main binary.
*/
for (p = symbol_table_list; p != NULL; p = p->next) {
map = (NautilusLeakSymbolLookupMap *)p->data;
if (nautilus_leak_find_symbol_in_map (map, (long)address, function_name,
source_file_name, (unsigned int *)line))
return TRUE;
}
}
return FALSE;
}
void
get_function_at_address (const char *app_path, void *address, string &result)
{
char *function_name;
char *source_file_name;
int line;
nautilus_leak_symbol_map_load_if_needed (app_path, true);
if (nautilus_leak_find_symbol_address (address, &function_name, &source_file_name, &line)) {
result = function_name;
g_free (function_name);
g_free (source_file_name);
} else {
result = "unknown function";
}
}
void
nautilus_leak_print_symbol_address (const char *app_path, void *address)
{
char *function_name;
char *source_file_name;
int line;
nautilus_leak_symbol_map_load_if_needed (app_path, true);
if (nautilus_leak_find_symbol_address (address, &function_name, &source_file_name, &line)) {
if (line >= 0) {
printf("%10p %-30s %s:%d\n", address, function_name, source_file_name, line);
} else {
printf("%10p %-30s in library %s\n", address, function_name, source_file_name);
}
g_free (function_name);
g_free (source_file_name);
} else {
printf("%p (unknown function)\n", address);
}
}
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