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cell-binutils  2.17cvs20070401
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corefile.h File Reference
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Classes

struct  function_map

Functions

void core_init (const char *)
void core_get_text_space (bfd *)
void core_create_function_syms (void)
void core_create_line_syms (void)

Variables

struct function_mapsymbol_map
unsigned int symbol_map_count
bfdcore_bfd
asectioncore_text_sect
PTR core_text_space
int offset_to_code

Class Documentation

struct function_map

Definition at line 24 of file corefile.h.

Class Members
char * file_name
char * function_name

Function Documentation

void core_create_function_syms ( void  )

Definition at line 426 of file corefile.c.

{
  bfd_vma min_vma = ~(bfd_vma) 0;
  bfd_vma max_vma = 0;
  int class;
  long i, found, skip;
  unsigned int j;

  /* 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)
    {
      asection *sym_sec;

      class = core_sym_class (core_syms[i]);

      if (!class)
       {
         DBG (AOUTDEBUG,
              printf ("[core_create_function_syms] rejecting: 0x%lx %s\n",
                     (unsigned long) 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.  */
      sym_sec = core_syms[i]->section;
      symtab.limit->addr = core_syms[i]->value;
      if (sym_sec)
       symtab.limit->addr += bfd_get_section_vma (sym_sec->owner, sym_sec);

      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;
       }

      /* Lookup filename and line number, if we can.  */
      {
       const char *filename, *func_name;

       if (get_src_info (symtab.limit->addr, &filename, &func_name,
                       &symtab.limit->line_num))
         {
           symtab.limit->file = source_file_lookup_path (filename);

           /* FIXME: Checking __osf__ here does not work with a cross
              gprof.  */
#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 (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;

      /* Keep track of the minimum and maximum vma addresses used by all
        symbols.  When computing the max_vma, use the ending address of the
        section containing the symbol, if available.  */
      min_vma = MIN (symtab.limit->addr, min_vma);
      if (sym_sec)
       max_vma = MAX (bfd_get_section_vma (sym_sec->owner, sym_sec)
                     + bfd_section_size (sym_sec->owner, sym_sec) - 1,
                     max_vma);
      else
       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,
                           (unsigned long) 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 = ~(bfd_vma) 0;
  ++symtab.limit;

  symtab.len = symtab.limit - symtab.base;
  symtab_finalize (&symtab);
}

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void core_create_line_syms ( void  )

Definition at line 612 of file corefile.c.

{
  char *prev_name, *prev_filename;
  unsigned int prev_name_len, prev_filename_len;
  bfd_vma vma, min_vma = ~(bfd_vma) 0, max_vma = 0;
  Sym *prev, dummy, *sentinel, *sym;
  const char *filename;
  int prev_line_num;
  Sym_Table ltab;
  bfd_vma vma_high;

  /* 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 ();

  /* Pass 1: count the 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.  */
  prev_name_len = PATH_MAX;
  prev_filename_len = PATH_MAX;
  prev_name = xmalloc (prev_name_len);
  prev_filename = xmalloc (prev_filename_len);
  ltab.len = 0;
  prev_line_num = 0;

  vma_high = core_text_sect->vma + bfd_get_section_size (core_text_sect);
  for (vma = core_text_sect->vma; vma < vma_high; vma += min_insn_size)
    {
      unsigned int len;

      if (!get_src_info (vma, &filename, &dummy.name, &dummy.line_num)
         || (prev_line_num == dummy.line_num
             && prev_name != NULL
             && strcmp (prev_name, dummy.name) == 0
             && strcmp (prev_filename, filename) == 0))
       continue;

      ++ltab.len;
      prev_line_num = dummy.line_num;

      len = strlen (dummy.name);
      if (len >= prev_name_len)
       {
         prev_name_len = len + 1024;
         free (prev_name);
         prev_name = xmalloc (prev_name_len);
       }

      strcpy (prev_name, dummy.name);
      len = strlen (filename);

      if (len >= prev_filename_len)
       {
         prev_filename_len = len + 1024;
         free (prev_filename);
         prev_filename = xmalloc (prev_filename_len);
       }

      strcpy (prev_filename, filename);

      min_vma = MIN (vma, min_vma);
      max_vma = MAX (vma, max_vma);
    }

  free (prev_name);
  free (prev_filename);

  /* 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.  */

  /* We now set is_static as we go along, rather than by running
     through the symbol table at the end.

     The old way called symtab_finalize before the is_static pass,
     causing a problem since symtab_finalize uses is_static as part of
     its address conflict resolution algorithm.  Since global symbols
     were prefered over static symbols, and all line symbols were
     global at that point, static function names that conflicted with
     their own line numbers (static, but labeled as global) were
     rejected in favor of the line num.

     This was not the desired functionality.  We always want to keep
     our function symbols and discard any conflicting line symbols.
     Perhaps symtab_finalize should be modified to make this
     distinction as well, but the current fix works and the code is a
     lot cleaner now.  */
  prev = 0;

  for (vma = core_text_sect->vma; vma < vma_high; vma += min_insn_size)
    {
      sym_init (ltab.limit);

      if (!get_src_info (vma, &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 = xstrdup (ltab.limit->name);
      ltab.limit->file = source_file_lookup_path (filename);

      ltab.limit->addr = vma;

      /* Set is_static based on the enclosing function, using either:
        1) the previous symbol, if it's from the same function, or
        2) a symtab lookup.  */
      if (prev && ltab.limit->file == prev->file &&
         strcmp (ltab.limit->name, prev->name) == 0)
       {
         ltab.limit->is_static = prev->is_static;
       }
      else
       {
         sym = sym_lookup(&symtab, ltab.limit->addr);
         ltab.limit->is_static = sym->is_static;
       }

      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] %lu %s 0x%lx\n",
                           (unsigned long) (ltab.limit - ltab.base),
                           ltab.limit->name,
                           (unsigned long) ltab.limit->addr));
      ++ltab.limit;
    }

  /* Update sentinels.  */
  sentinel = sym_lookup (&symtab, (bfd_vma) 0);

  if (sentinel
      && strcmp (sentinel->name, "<locore>") == 0
      && min_vma <= sentinel->end_addr)
    sentinel->end_addr = min_vma - 1;

  sentinel = sym_lookup (&symtab, ~(bfd_vma) 0);

  if (sentinel
      && 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 ((unsigned int) (ltab.limit - ltab.base) != ltab.len)
    {
      fprintf (stderr,
              _("%s: somebody miscounted: ltab.len=%d instead of %ld\n"),
              whoami, ltab.len, (long) (ltab.limit - ltab.base));
      done (1);
    }

  /* Finalize ltab and make it symbol table.  */
  symtab_finalize (&ltab);
  free (symtab.base);
  symtab = ltab;
}

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void core_get_text_space ( bfd )

Definition at line 245 of file corefile.c.

{
  core_text_space = malloc (bfd_get_section_size (core_text_sect));

  if (!core_text_space)
    {
      fprintf (stderr, _("%s: ran out room for %lu bytes of text space\n"),
              whoami, (unsigned long) bfd_get_section_size (core_text_sect));
      done (1);
    }

  if (!bfd_get_section_contents (cbfd, core_text_sect, core_text_space,
                             0, bfd_get_section_size (core_text_sect)))
    {
      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);
}

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void core_init ( const char *  )

Definition at line 149 of file corefile.c.

{
  int core_sym_bytes;
  asymbol *synthsyms;
  long synth_count;

  core_bfd = bfd_openr (aout_name, 0);

  if (!core_bfd)
    {
      perror (aout_name);
      done (1);
    }

  if (!bfd_check_format (core_bfd, bfd_object))
    {
      fprintf (stderr, _("%s: %s: not in executable format\n"), whoami, aout_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, aout_name);
         done (1);
       }
    }

  /* Read core's symbol table.  */

  /* This will probably give us more than we need, but that's ok.  */
  core_sym_bytes = bfd_get_symtab_upper_bound (core_bfd);
  if (core_sym_bytes < 0)
    {
      fprintf (stderr, "%s: %s: %s\n", whoami, aout_name,
              bfd_errmsg (bfd_get_error ()));
      done (1);
    }

  core_syms = (asymbol **) xmalloc (core_sym_bytes);
  core_num_syms = bfd_canonicalize_symtab (core_bfd, core_syms);

  if (core_num_syms < 0)
    {
      fprintf (stderr, "%s: %s: %s\n", whoami, aout_name,
              bfd_errmsg (bfd_get_error ()));
      done (1);
    }

  synth_count = bfd_get_synthetic_symtab (core_bfd, core_num_syms, core_syms,
                                     0, NULL, &synthsyms);
  if (synth_count > 0)
    {
      asymbol **symp;
      long new_size;
      long i;

      new_size = (core_num_syms + synth_count + 1) * sizeof (*core_syms);
      core_syms = xrealloc (core_syms, new_size);
      symp = core_syms + core_num_syms;
      core_num_syms += synth_count;
      for (i = 0; i < synth_count; i++)
       *symp++ = synthsyms + i;
      *symp = 0;
    }

  min_insn_size = 1;
  offset_to_code = 0;

  switch (bfd_get_arch (core_bfd))
    {
    case bfd_arch_vax:
    case bfd_arch_tahoe:
      offset_to_code = 2;
      break;

    case bfd_arch_alpha:
      min_insn_size = 4;
      break;

    default:
      break;
    }

  if (function_mapping_file)
    read_function_mappings (function_mapping_file);
}

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Variable Documentation

Definition at line 30 of file corefile.c.

Definition at line 33 of file corefile.c.

Definition at line 34 of file corefile.c.

Definition at line 37 of file corefile.c.

Definition at line 40 of file corefile.c.

Definition at line 41 of file corefile.c.