symmisc.c

早期freebsd实现

/* Do various things to symbol tables (other than lookup), for GDB.
   Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
#include "breakpoint.h"
#include "command.h"
#include "obstack.h"
#include "language.h"

#include <string.h>

#ifndef DEV_TTY
#define DEV_TTY "/dev/tty"
#endif

/* Unfortunately for debugging, stderr is usually a macro.  Better if we
   make a variable which has the same value and which is accessible when
   debugging GDB with itself.  */
FILE *std_in  = stdin;
FILE *std_out = stdout;
FILE *std_err = stderr;

/* Prototypes for local functions */

static void 
dump_symtab PARAMS ((struct objfile *, struct symtab *, FILE *));

static void 
dump_psymtab PARAMS ((struct objfile *, struct partial_symtab *, FILE *));

static void 
dump_msymbols PARAMS ((struct objfile *, FILE *));

static void 
dump_objfile PARAMS ((struct objfile *));

static int
block_depth PARAMS ((struct block *));

static void
print_partial_symbol PARAMS ((struct partial_symbol *, int, char *, FILE *));

static void
print_symbol PARAMS ((struct symbol *, int, FILE *));

static void
free_symtab_block PARAMS ((struct objfile *, struct block *));


/* Free a struct block <- B and all the symbols defined in that block.  */

static void
free_symtab_block (objfile, b)
     struct objfile *objfile;
     struct block *b;
{
  register int i, n;
  n = BLOCK_NSYMS (b);
  for (i = 0; i < n; i++)
    {
      mfree (objfile -> md, SYMBOL_NAME (BLOCK_SYM (b, i)));
      mfree (objfile -> md, (PTR) BLOCK_SYM (b, i));
    }
  mfree (objfile -> md, (PTR) b);
}

/* Free all the storage associated with the struct symtab <- S.
   Note that some symtabs have contents malloc'ed structure by structure,
   while some have contents that all live inside one big block of memory,
   and some share the contents of another symbol table and so you should
   not free the contents on their behalf (except sometimes the linetable,
   which maybe per symtab even when the rest is not).
   It is s->free_code that says which alternative to use.  */

void
free_symtab (s)
     register struct symtab *s;
{
  register int i, n;
  register struct blockvector *bv;

  switch (s->free_code)
    {
    case free_nothing:
      /* All the contents are part of a big block of memory (an obstack),
	 and some other symtab is in charge of freeing that block.
	 Therefore, do nothing.  */
      break;

    case free_contents:
      /* Here all the contents were malloc'ed structure by structure
	 and must be freed that way.  */
      /* First free the blocks (and their symbols.  */
      bv = BLOCKVECTOR (s);
      n = BLOCKVECTOR_NBLOCKS (bv);
      for (i = 0; i < n; i++)
	free_symtab_block (s -> objfile, BLOCKVECTOR_BLOCK (bv, i));
      /* Free the blockvector itself.  */
      mfree (s -> objfile -> md, (PTR) bv);
      /* Also free the linetable.  */
      
    case free_linetable:
      /* Everything will be freed either by our `free_ptr'
	 or by some other symtab, except for our linetable.
	 Free that now.  */
      if (LINETABLE (s))
	mfree (s -> objfile -> md, (PTR) LINETABLE (s));
      break;
    }

  /* If there is a single block of memory to free, free it.  */
  if (s -> free_ptr != NULL)
    mfree (s -> objfile -> md, s -> free_ptr);

  /* Free source-related stuff */
  if (s -> line_charpos != NULL)
    mfree (s -> objfile -> md, (PTR) s -> line_charpos);
  if (s -> fullname != NULL)
    mfree (s -> objfile -> md, s -> fullname);
  mfree (s -> objfile -> md, (PTR) s);
}

#if MAINTENANCE_CMDS

static void 
dump_objfile (objfile)
     struct objfile *objfile;
{
  struct symtab *symtab;
  struct partial_symtab *psymtab;

  printf_filtered ("\nObject file %s:  ", objfile -> name);
  printf_filtered ("Objfile at %x, bfd at %x, %d minsyms\n\n",
		   objfile, objfile -> obfd, objfile->minimal_symbol_count);

  if (objfile -> psymtabs)
    {
      printf_filtered ("Psymtabs:\n");
      for (psymtab = objfile -> psymtabs;
	   psymtab != NULL;
	   psymtab = psymtab -> next)
	{
	  printf_filtered ("%s at %x, ", psymtab -> filename, psymtab);
	  if (psymtab -> objfile != objfile)
	    {
	      printf_filtered ("NOT ON CHAIN!  ");
	    }
	  wrap_here ("  ");
	}
      printf_filtered ("\n\n");
    }

  if (objfile -> symtabs)
    {
      printf_filtered ("Symtabs:\n");
      for (symtab = objfile -> symtabs;
	   symtab != NULL;
	   symtab = symtab->next)
	{
	  printf_filtered ("%s at %x, ", symtab -> filename, symtab);
	  if (symtab -> objfile != objfile)
	    {
	      printf_filtered ("NOT ON CHAIN!  ");
	    }
	  wrap_here ("  ");
	}
      printf_filtered ("\n\n");
    }
}

/* Print minimal symbols from this objfile.  */
 
static void 
dump_msymbols (objfile, outfile)
     struct objfile *objfile;
     FILE *outfile;
{
  struct minimal_symbol *msymbol;
  int index;
  char ms_type;
  
  fprintf_filtered (outfile, "\nObject file %s:\n\n", objfile -> name);
  for (index = 0, msymbol = objfile -> msymbols;
       msymbol -> name != NULL; msymbol++, index++)
    {
      switch (msymbol -> type)
	{
	  case mst_unknown:
	    ms_type = 'u';
	    break;
	  case mst_text:
	    ms_type = 't';
	    break;
	  case mst_data:
	    ms_type = 'd';
	    break;
	  case mst_bss:
	    ms_type = 'b';
	    break;
	  case mst_abs:
	    ms_type = 'a';
	    break;
	  default:
	    ms_type = '?';
	    break;
	}
      fprintf_filtered (outfile, "[%2d] %c %#10x %s\n", index, ms_type,
			msymbol -> address, msymbol -> name);
    }
  if (objfile -> minimal_symbol_count != index)
    {
      warning ("internal error:  minimal symbol count %d != %d",
	       objfile -> minimal_symbol_count, index);
    }
  fprintf_filtered (outfile, "\n");
}

static void
dump_psymtab (objfile, psymtab, outfile)
     struct objfile *objfile;
     struct partial_symtab *psymtab;
     FILE *outfile;
{

  fprintf_filtered (outfile, "\nPartial symtab for source file %s ",
		    psymtab -> filename);
  fprintf_filtered (outfile, "(object 0x%x)\n\n", psymtab);
  fprintf (outfile, "  Read from object file %s (0x%x)\n",
	   objfile -> name, (unsigned int) objfile);
  
  if (psymtab -> readin)
    {
      fprintf_filtered (outfile,
		"  Full symtab was read (at 0x%x by function at 0x%x)\n",
			psymtab -> symtab, psymtab -> read_symtab);
    }

  /* FIXME, we need to be able to print the relocation stuff. */
  /* This prints some garbage for anything but stabs right now.  FIXME.  */
  if (psymtab->section_offsets)
    fprintf_filtered (outfile, "  Relocate symbols by 0x%x, 0x%x, 0x%x, 0x%x.\n",
		      ANOFFSET (psymtab->section_offsets, 0),
		      ANOFFSET (psymtab->section_offsets, 1),
		      ANOFFSET (psymtab->section_offsets, 2),
		      ANOFFSET (psymtab->section_offsets, 3));

  fprintf_filtered (outfile, "  Symbols cover text addresses 0x%x-0x%x\n",
		    psymtab -> textlow, psymtab -> texthigh);
  fprintf_filtered (outfile, "  Depends on %d other partial symtabs.\n",
		    psymtab -> number_of_dependencies);
  if (psymtab -> n_global_syms > 0)
    {
      print_partial_symbol (objfile -> global_psymbols.list
			    + psymtab -> globals_offset,
			    psymtab -> n_global_syms, "Global", outfile);
    }
  if (psymtab -> n_static_syms > 0)
    {
      print_partial_symbol (objfile -> static_psymbols.list
			    + psymtab -> statics_offset,
			    psymtab -> n_static_syms, "Static", outfile);
    }
  fprintf_filtered (outfile, "\n");
}

static void 
dump_symtab (objfile, symtab, outfile)
     struct objfile *objfile;
     struct symtab *symtab;
     FILE *outfile;
{
  register int i, j;
  int len, blen;
  register struct linetable *l;
  struct blockvector *bv;
  register struct block *b;
  int depth;

  fprintf (outfile, "\nSymtab for file %s\n", symtab->filename);
  fprintf (outfile, "Read from object file %s (%x)\n", objfile->name,
	   (unsigned int) objfile);
  fprintf (outfile, "Language: %s\n", language_str (symtab -> language));
  
  /* First print the line table.  */
  l = LINETABLE (symtab);
  if (l) {
    fprintf (outfile, "\nLine table:\n\n");
    len = l->nitems;
    for (i = 0; i < len; i++)
      fprintf (outfile, " line %d at %x\n", l->item[i].line,
	       l->item[i].pc);
  }
  /* Now print the block info.  */
  fprintf (outfile, "\nBlockvector:\n\n");
  bv = BLOCKVECTOR (symtab);
  len = BLOCKVECTOR_NBLOCKS (bv);
  for (i = 0; i < len; i++)
    {
      b = BLOCKVECTOR_BLOCK (bv, i);
      depth = block_depth (b) * 2;
      print_spaces (depth, outfile);
      fprintf (outfile, "block #%03d (object 0x%x) ", i, (unsigned int) b);
      fprintf (outfile, "[0x%x..0x%x]", BLOCK_START (b), BLOCK_END (b));
      if (BLOCK_SUPERBLOCK (b))
	fprintf (outfile, " (under 0x%x)", (unsigned int) BLOCK_SUPERBLOCK (b));
      if (BLOCK_FUNCTION (b))
	fprintf (outfile, " %s", SYMBOL_NAME (BLOCK_FUNCTION (b)));
      if (BLOCK_GCC_COMPILED(b))
	fprintf (outfile, " gcc%d compiled", BLOCK_GCC_COMPILED(b));
      fputc ('\n', outfile);
      blen = BLOCK_NSYMS (b);
      for (j = 0; j < blen; j++)
	{
	  print_symbol (BLOCK_SYM (b, j), depth + 1, outfile);
	}
    }
  fprintf (outfile, "\n");
}

void
maintenance_print_symbols (args, from_tty)
     char *args;
     int from_tty;
{
  char **argv;
  FILE *outfile;
  struct cleanup *cleanups;
  char *symname = NULL;
  char *filename = DEV_TTY;
  struct objfile *objfile;
  struct symtab *s;

  dont_repeat ();

  if (args == NULL)
    {
      error ("print-symbols takes an output file name and optional symbol file name");
    }
  else if ((argv = buildargv (args)) == NULL)
    {
      nomem (0);
    }
  cleanups = make_cleanup (freeargv, (char *) argv);

  if (argv[0] != NULL)
    {
      filename = argv[0];
      /* If a second arg is supplied, it is a source file name to match on */
      if (argv[1] != NULL)
	{
	  symname = argv[1];
	}
    }

  filename = tilde_expand (filename);
  make_cleanup (free, filename);
  
  outfile = fopen (filename, "w");
  if (outfile == 0)
    perror_with_name (filename);
  make_cleanup (fclose, (char *) outfile);

  immediate_quit++;
  ALL_SYMTABS (objfile, s)
    if (symname == NULL || (strcmp (symname, s -> filename) == 0))
      dump_symtab (objfile, s, outfile);
  immediate_quit--;
  do_cleanups (cleanups);
}

static void
print_symbol (symbol, depth, outfile)
     struct symbol *symbol;
     int depth;
     FILE *outfile;
{
  print_spaces (depth, outfile);
  if (SYMBOL_NAMESPACE (symbol) == LABEL_NAMESPACE)
    {
      fprintf (outfile, "label %s at 0x%x\n", SYMBOL_NAME (symbol),
	       SYMBOL_VALUE_ADDRESS (symbol));
      return;
    }
  if (SYMBOL_NAMESPACE (symbol) == STRUCT_NAMESPACE)
    {
      if (TYPE_NAME (SYMBOL_TYPE (symbol)))
	{
	  type_print_1 (SYMBOL_TYPE (symbol), "", outfile, 1, depth);
	}
      else
	{
	  fprintf (outfile, "%s %s = ",
	       (TYPE_CODE (SYMBOL_TYPE (symbol)) == TYPE_CODE_ENUM
		? "enum"