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binutils-gdb/gprof/core.c

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#include "libiberty.h"
#include "gprof.h"
#include "core.h"
#include "symtab.h"
bfd *core_bfd;
int core_num_syms;
asymbol **core_syms;
asection *core_text_sect;
PTR core_text_space;
/* For mapping symbols to specific .o files during file ordering. */
struct function_map {
char *function_name;
char *file_name;
};
struct function_map *symbol_map;
int symbol_map_count;
static void
DEFUN (read_function_mappings, (filename), const char *filename)
{
FILE *file = fopen (filename, "r");
char dummy[1024];
int count = 0;
if (!file)
{
fprintf (stderr, "%s: could not open %s.\n", whoami, filename);
done (1);
}
/* First parse the mapping file so we know how big we need to
make our tables. We also do some sanity checks at this
time. */
while (!feof (file))
{
int matches;
matches = fscanf (file, "%[^\n:]", dummy);
if (!matches)
{
fprintf (stderr, "%s: unable to parse mapping file %s.\n",
whoami, filename);
done (1);
}
/* Just skip messages about files with no symbols. */
if (!strncmp (dummy, "No symbols in ", 14))
{
fscanf (file, "\n");
continue;
}
/* Don't care what else is on this line at this point. */
fscanf (file, "%[^\n]\n", dummy);
count++;
}
/* Now we know how big we need to make our table. */
symbol_map = xmalloc (count * sizeof (struct function_map));
/* Rewind the input file so we can read it again. */
rewind (file);
/* Read each entry and put it into the table. */
count = 0;
while (!feof (file))
{
int matches;
char *tmp;
matches = fscanf (file, "%[^\n:]", dummy);
if (!matches)
{
fprintf (stderr, "%s: unable to parse mapping file %s.\n",
whoami, filename);
done (1);
}
/* Just skip messages about files with no symbols. */
if (!strncmp (dummy, "No symbols in ", 14))
{
fscanf (file, "\n");
continue;
}
/* dummy has the filename, go ahead and copy it. */
symbol_map[count].file_name = xmalloc (strlen (dummy) + 1);
strcpy (symbol_map[count].file_name, dummy);
/* Now we need the function name. */
fscanf (file, "%[^\n]\n", dummy);
tmp = strrchr (dummy, ' ') + 1;
symbol_map[count].function_name = xmalloc (strlen (tmp) + 1);
strcpy (symbol_map[count].function_name, tmp);
count++;
}
/* Record the size of the map table for future reference. */
symbol_map_count = count;
}
void
DEFUN (core_init, (a_out_name), const char *a_out_name)
{
core_bfd = bfd_openr (a_out_name, 0);
if (!core_bfd)
{
perror (a_out_name);
done (1);
}
if (!bfd_check_format (core_bfd, bfd_object))
{
fprintf (stderr, "%s: %s: not in a.out format\n", whoami, a_out_name);
done (1);
}
/* get core's text section: */
core_text_sect = bfd_get_section_by_name (core_bfd, ".text");
if (!core_text_sect)
{
core_text_sect = bfd_get_section_by_name (core_bfd, "$CODE$");
if (!core_text_sect)
{
fprintf (stderr, "%s: can't find .text section in %s\n",
whoami, a_out_name);
done (1);
}
}
/* read core's symbol table: */
/* this will probably give us more than we need, but that's ok: */
core_num_syms = bfd_get_symtab_upper_bound (core_bfd);
if (core_num_syms < 0)
{
fprintf (stderr, "%s: %s: %s\n", whoami, a_out_name,
bfd_errmsg (bfd_get_error ()));
done (1);
}
core_syms = (asymbol **) xmalloc (core_num_syms);
core_num_syms = bfd_canonicalize_symtab (core_bfd, core_syms);
if (core_num_syms < 0)
{
fprintf (stderr, "%s: %s: %s\n", whoami, a_out_name,
bfd_errmsg (bfd_get_error ()));
done (1);
}
if (function_mapping_file)
read_function_mappings (function_mapping_file);
}
/*
* Read in the text space of an a.out file
*/
void
DEFUN (core_get_text_space, (core_bfd), bfd * core_bfd)
{
core_text_space = (PTR) malloc (core_text_sect->_raw_size);
if (!core_text_space)
{
fprintf (stderr, "%s: ran out room for %ld bytes of text space\n",
whoami, core_text_sect->_raw_size);
done (1);
}
if (!bfd_get_section_contents (core_bfd, core_text_sect, core_text_space,
0, core_text_sect->_raw_size))
{
bfd_perror ("bfd_get_section_contents");
free (core_text_space);
core_text_space = 0;
}
if (!core_text_space)
{
fprintf (stderr, "%s: can't do -c\n", whoami);
}
}
/*
* Return class of symbol SYM. The returned class can be any of:
* 0 -> symbol is not interesting to us
* 'T' -> symbol is a global name
* 't' -> symbol is a local (static) name
*/
static int
DEFUN (core_sym_class, (sym), asymbol * sym)
{
symbol_info syminfo;
const char *name;
char sym_prefix;
int i;
/*
* Must be a text symbol, and static text symbols don't qualify if
* ignore_static_funcs set.
*/
if (!sym->section)
{
return 0;
}
if (ignore_static_funcs && (sym->flags & BSF_LOCAL))
{
DBG (AOUTDEBUG, printf ("[core_sym_class] %s: not a function\n",
sym->name));
return 0;
}
bfd_get_symbol_info (core_bfd, sym, &syminfo);
i = syminfo.type;
if (i == 'T')
{
return i; /* it's a global symbol */
}
if (i != 't')
{
/* not a static text symbol */
DBG (AOUTDEBUG, printf ("[core_sym_class] %s is of class %c\n",
sym->name, i));
return 0;
}
/* do some more filtering on static function-names: */
if (ignore_static_funcs)
{
return 0;
}
/*
* Can't zero-length name or funny characters in name, where
* `funny' includes: `.' (.o file names) and `$' (Pascal labels).
*/
if (!sym->name || sym->name[0] == '\0')
{
return 0;
}
for (name = sym->name; *name; ++name)
{
if (*name == '.' || *name == '$')
{
return 0;
}
}
/*
* On systems where the C compiler adds an underscore to all
* names, static names without underscores seem usually to be
* labels in hand written assembler in the library. We don't want
* these names. This is certainly necessary on a Sparc running
* SunOS 4.1 (try profiling a program that does a lot of
* division). I don't know whether it has harmful side effects on
* other systems. Perhaps it should be made configurable.
*/
sym_prefix = bfd_get_symbol_leading_char (core_bfd);
if (sym_prefix && sym_prefix != sym->name[0]
/*
* GCC may add special symbols to help gdb figure out the file
* language. We want to ignore these, since sometimes they mask
* the real function. (dj@ctron)
*/
|| !strncmp (sym->name, "__gnu_compiled", 14)
|| !strncmp (sym->name, "___gnu_compiled", 15))
{
return 0;
}
/* If the object file supports marking of function symbols, then we can
zap anything that doesn't have BSF_FUNCTION set. */
if (ignore_non_functions && (sym->flags & BSF_FUNCTION) == 0)
return 0;
return 't'; /* it's a static text symbol */
}
/*
* Get whatever source info we can get regarding address ADDR:
*/
static bool
DEFUN (get_src_info, (addr, filename, name, line_num),
bfd_vma addr AND const char **filename AND const char **name
AND int *line_num)
{
const char *fname = 0, *func_name = 0;
int l = 0;
if (bfd_find_nearest_line (core_bfd, core_text_sect, core_syms,
addr - core_text_sect->vma,
&fname, &func_name, (unsigned int *) &l)
&& fname && func_name && l)
{
DBG (AOUTDEBUG, printf ("[get_src_info] 0x%lx -> %s:%d (%s)\n",
addr, fname, l, func_name));
*filename = fname;
*name = func_name;
*line_num = l;
return TRUE;
}
else
{
DBG (AOUTDEBUG, printf ("[get_src_info] no info for 0x%lx (%s:%d,%s)\n",
(long) addr, fname ? fname : "<unknown>", l,
func_name ? func_name : "<unknown>"));
return FALSE;
}
}
/*
* Read in symbol table from core. One symbol per function is
* entered.
*/
void
DEFUN (core_create_function_syms, (core_bfd), bfd * core_bfd)
{
bfd_vma min_vma = ~0, max_vma = 0;
const char *filename, *func_name;
int class;
long i, j, found, skip;
/* pass 1 - determine upper bound on number of function names: */
symtab.len = 0;
for (i = 0; i < core_num_syms; ++i)
{
if (!core_sym_class (core_syms[i]))
{
continue;
}
/* This should be replaced with a binary search or hashed
search. Gross.
Don't create a symtab entry for a function that has
a mapping to a file, unless it's the first function
in the file. */
skip = 0;
for (j = 0; j < symbol_map_count; j++)
if (!strcmp (core_syms[i]->name, symbol_map[j].function_name))
{
if (j > 0 && ! strcmp (symbol_map [j].file_name,
symbol_map [j - 1].file_name))
skip = 1;
break;
}
if (!skip)
++symtab.len;
}
if (symtab.len == 0)
{
fprintf (stderr, "%s: file `%s' has no symbols\n", whoami, a_out_name);
done (1);
}
/* the "+ 2" is for the sentinels: */
symtab.base = (Sym *) xmalloc ((symtab.len + 2) * sizeof (Sym));
/* pass 2 - create symbols: */
symtab.limit = symtab.base;
for (i = 0; i < core_num_syms; ++i)
{
class = core_sym_class (core_syms[i]);
if (!class)
{
DBG (AOUTDEBUG,
printf ("[core_create_function_syms] rejecting: 0x%lx %s\n",
core_syms[i]->value, core_syms[i]->name));
continue;
}
/* This should be replaced with a binary search or hashed
search. Gross. */
skip = 0;
found = 0;
for (j = 0; j < symbol_map_count; j++)
if (!strcmp (core_syms[i]->name, symbol_map[j].function_name))
{
if (j > 0 && ! strcmp (symbol_map [j].file_name,
symbol_map [j - 1].file_name))
skip = 1;
else
found = j;
break;
}
if (skip)
continue;
sym_init (symtab.limit);
/* symbol offsets are always section-relative: */
symtab.limit->addr = core_syms[i]->value + core_syms[i]->section->vma;
if (symbol_map_count
&& !strcmp (core_syms[i]->name, symbol_map[found].function_name))
{
symtab.limit->name = symbol_map[found].file_name;
symtab.limit->mapped = 1;
}
else
{
symtab.limit->name = core_syms[i]->name;
symtab.limit->mapped = 0;
}
#ifdef __osf__
/*
* Suppress symbols that are not function names. This is
* useful to suppress code-labels and aliases.
*
* This is known to be useful under DEC's OSF/1. Under SunOS 4.x,
* labels do not appear in the symbol table info, so this isn't
* necessary.
*/
if (get_src_info (symtab.limit->addr, &filename, &func_name,
&symtab.limit->line_num))
{
symtab.limit->file = source_file_lookup_path (filename);
if (strcmp (symtab.limit->name, func_name) != 0)
{
/*
* The symbol's address maps to a different name, so
* it can't be a function-entry point. This happens
* for labels, for example.
*/
DBG (AOUTDEBUG,
printf ("[core_create_function_syms: rej %s (maps to %s)\n",
symtab.limit->name, func_name));
continue;
}
}
#endif
symtab.limit->is_func = TRUE;
symtab.limit->is_bb_head = TRUE;
if (class == 't')
{
symtab.limit->is_static = TRUE;
}
min_vma = MIN (symtab.limit->addr, min_vma);
max_vma = MAX (symtab.limit->addr, max_vma);
/*
* If we see "main" without an initial '_', we assume names
* are *not* prefixed by '_'.
*/
if (symtab.limit->name[0] == 'm' && discard_underscores
&& strcmp (symtab.limit->name, "main") == 0)
{
discard_underscores = 0;
}
DBG (AOUTDEBUG, printf ("[core_create_function_syms] %ld %s 0x%lx\n",
(long) (symtab.limit - symtab.base),
symtab.limit->name, symtab.limit->addr));
++symtab.limit;
}
/* create sentinels: */
sym_init (symtab.limit);
symtab.limit->name = "<locore>";
symtab.limit->addr = 0;
symtab.limit->end_addr = min_vma - 1;
++symtab.limit;
sym_init (symtab.limit);
symtab.limit->name = "<hicore>";
symtab.limit->addr = max_vma + 1;
symtab.limit->end_addr = ~0;
++symtab.limit;
symtab.len = symtab.limit - symtab.base;
symtab_finalize (&symtab);
}
/*
* Read in symbol table from core. One symbol per line of source code
* is entered.
*/
void
DEFUN (core_create_line_syms, (core_bfd), bfd * core_bfd)
{
char prev_name[PATH_MAX], prev_filename[PATH_MAX];
bfd_vma vma, min_vma = ~0, max_vma = 0;
bfd_vma offset, prev_offset, min_dist;
Sym *prev, dummy, *sentinel, *sym;
const char *filename;
int prev_line_num, i;
Sym_Table ltab;
/*
* Create symbols for functions as usual. This is necessary in
* cases where parts of a program were not compiled with -g. For
* those parts we still want to get info at the function level:
*/
core_create_function_syms (core_bfd);
/* pass 1 - counter number of symbols: */
/*
* To find all line information, walk through all possible
* text-space addresses (one by one!) and get the debugging
* info for each address. When the debugging info changes,
* it is time to create a new symbol.
*
* Of course, this is rather slow and it would be better if
* bfd would provide an iterator for enumerating all line
* infos, but for now, we try to speed up the second pass
* by determining what the minimum code distance between two
* lines is.
*/
prev_name[0] = '\0';
ltab.len = 0;
min_dist = core_text_sect->_raw_size;
prev_offset = -min_dist;
prev_filename[0] = '\0';
prev_line_num = 0;
for (offset = 0; offset < core_text_sect->_raw_size; ++offset)
{
vma = core_text_sect->vma + offset;
if (!get_src_info (vma, &filename, &dummy.name, &dummy.line_num)
|| (prev_line_num == dummy.line_num &&
strcmp (prev_name, dummy.name) == 0
&& strcmp (prev_filename, filename) == 0))
{
continue;
}
++ltab.len;
prev_line_num = dummy.line_num;
strcpy (prev_name, dummy.name);
strcpy (prev_filename, filename);
if (offset - prev_offset < min_dist)
{
min_dist = offset - prev_offset;
}
prev_offset = offset;
min_vma = MIN (vma, min_vma);
max_vma = MAX (vma, max_vma);
}
DBG (AOUTDEBUG, printf ("[core_create_line_syms] min_dist=%lx\n", min_dist));
/* make room for function symbols, too: */
ltab.len += symtab.len;
ltab.base = (Sym *) xmalloc (ltab.len * sizeof (Sym));
ltab.limit = ltab.base;
/* pass 2 - create symbols: */
prev = 0;
for (offset = 0; offset < core_text_sect->_raw_size; offset += min_dist)
{
sym_init (ltab.limit);
if (!get_src_info (core_text_sect->vma + offset, &filename,
&ltab.limit->name, &ltab.limit->line_num)
|| (prev && prev->line_num == ltab.limit->line_num
&& strcmp (prev->name, ltab.limit->name) == 0
&& strcmp (prev->file->name, filename) == 0))
{
continue;
}
/* make name pointer a malloc'ed string: */
ltab.limit->name = strdup (ltab.limit->name);
ltab.limit->file = source_file_lookup_path (filename);
ltab.limit->addr = core_text_sect->vma + offset;
prev = ltab.limit;
/*
* If we see "main" without an initial '_', we assume names
* are *not* prefixed by '_'.
*/
if (ltab.limit->name[0] == 'm' && discard_underscores
&& strcmp (ltab.limit->name, "main") == 0)
{
discard_underscores = 0;
}
DBG (AOUTDEBUG, printf ("[core_create_line_syms] %d %s 0x%lx\n",
ltab.len, ltab.limit->name,
ltab.limit->addr));
++ltab.limit;
}
/* update sentinels: */
sentinel = sym_lookup (&symtab, 0);
if (strcmp (sentinel->name, "<locore>") == 0
&& min_vma <= sentinel->end_addr)
{
sentinel->end_addr = min_vma - 1;
}
sentinel = sym_lookup (&symtab, ~0);
if (strcmp (sentinel->name, "<hicore>") == 0 && max_vma >= sentinel->addr)
{
sentinel->addr = max_vma + 1;
}
/* copy in function symbols: */
memcpy (ltab.limit, symtab.base, symtab.len * sizeof (Sym));
ltab.limit += symtab.len;
if (ltab.limit - ltab.base != ltab.len)
{
fprintf (stderr,
"%s: somebody miscounted: ltab.len=%ld instead of %d\n",
whoami, (long) (ltab.limit - ltab.base), ltab.len);
done (1);
}
/* finalize ltab and make it symbol table: */
symtab_finalize (&ltab);
free (symtab.base);
symtab = ltab;
/* now go through all core symbols and set is_static accordingly: */
for (i = 0; i < core_num_syms; ++i)
{
if (core_sym_class (core_syms[i]) == 't')
{
sym = sym_lookup (&symtab, core_syms[i]->value
+ core_syms[i]->section->vma);
do
{
sym++->is_static = TRUE;
}
while (sym->file == sym[-1].file &&
strcmp (sym->name, sym[-1].name) == 0);
}
}
}
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