corefile.c

来自「基于4个mips核的noc设计」· C语言 代码 · 共 742 行 · 第 1/2 页

      && fname && func_name && l)
    {
      DBG (AOUTDEBUG, printf ("[get_src_info] 0x%lx -> %s:%d (%s)\n",
			      (unsigned long) 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
core_create_function_syms (core_bfd)
     bfd *core_bfd ATTRIBUTE_UNUSED;
{
  bfd_vma min_vma = ~0, 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)
    {
      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.  */
      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;
	}

      /* 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;

      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,
			      (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 = ~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, *prev_filename;
  int prev_name_len, prev_filename_len;
  bfd_vma vma, min_vma = ~0, max_vma = 0;
  bfd_vma offset;
  Sym *prev, dummy, *sentinel, *sym;
  const char *filename;
  int prev_line_num;
  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.  */
  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;

  for (offset = 0; offset < core_text_sect->_raw_size; offset += min_insn_size)
    {
      int len;

      vma = core_text_sect->vma + offset;

      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 (offset = 0; offset < core_text_sect->_raw_size; offset += min_insn_size)
    {
      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 = xstrdup (ltab.limit->name);
      ltab.limit->file = source_file_lookup_path (filename);

      ltab.limit->addr = core_text_sect->vma + offset;

      /* 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, 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 ((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;
}