source: trunk/src/binutils/gas/stabs.c@ 358

/* Generic stabs parsing for gas.
   Copyright 1989, 1990, 1991, 1993, 1995, 1996, 1997, 1998, 2000, 2001
   Free Software Foundation, Inc.

This file is part of GAS, the GNU Assembler.

GAS 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,
or (at your option) any later version.

GAS 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 GAS; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

#include "as.h"
#include "obstack.h"
#include "subsegs.h"
#include "ecoff.h"

/* We need this, despite the apparent object format dependency, since
   it defines stab types, which all object formats can use now.  */

#include "aout/stab_gnu.h"

/* Holds whether the assembler is generating stabs line debugging
   information or not.  Potentially used by md_cleanup function.  */

int outputting_stabs_line_debug = 0;

static void s_stab_generic PARAMS ((int, char *, char *));
static void generate_asm_file PARAMS ((int, char *));

/* Allow backends to override the names used for the stab sections.  */
#ifndef STAB_SECTION_NAME
#define STAB_SECTION_NAME ".stab"
#endif

#ifndef STAB_STRING_SECTION_NAME
#define STAB_STRING_SECTION_NAME ".stabstr"
#endif

/* Non-zero if we're in the middle of a .func function, in which case
   stabs_generate_asm_lineno emits function relative line number stabs.
   Otherwise it emits line number stabs with absolute addresses.  Note that
   both cases only apply to assembler code assembled with -gstabs.  */
static int in_dot_func_p;

/* Label at start of current function if in_dot_func_p != 0.  */
static const char *current_function_label;

/*
 * Handle .stabX directives, which used to be open-coded.
 * So much creeping featurism overloaded the semantics that we decided
 * to put all .stabX thinking in one place. Here.
 *
 * We try to make any .stabX directive legal. Other people's AS will often
 * do assembly-time consistency checks: eg assigning meaning to n_type bits
 * and "protecting" you from setting them to certain values. (They also zero
 * certain bits before emitting symbols. Tut tut.)
 *
 * If an expression is not absolute we either gripe or use the relocation
 * information. Other people's assemblers silently forget information they
 * don't need and invent information they need that you didn't supply.
 */

/*
 * Build a string dictionary entry for a .stabX symbol.
 * The symbol is added to the .<secname>str section.
 */

#ifndef SEPARATE_STAB_SECTIONS
#define SEPARATE_STAB_SECTIONS 0
#endif

unsigned int
get_stab_string_offset (string, stabstr_secname)
     const char *string;
     const char *stabstr_secname;
{
  unsigned int length;
  unsigned int retval;
  segT save_seg;
  subsegT save_subseg;
  segT seg;
  char *p;

  if (! SEPARATE_STAB_SECTIONS)
    abort ();

  length = strlen (string);

  save_seg = now_seg;
  save_subseg = now_subseg;

  /* Create the stab string section.  */
  seg = subseg_new (stabstr_secname, 0);

  retval = seg_info (seg)->stabu.stab_string_size;
  if (retval <= 0)
    {
      /* Make sure the first string is empty.  */
      p = frag_more (1);
      *p = 0;
      retval = seg_info (seg)->stabu.stab_string_size = 1;
#ifdef BFD_ASSEMBLER
      bfd_set_section_flags (stdoutput, seg, SEC_READONLY | SEC_DEBUGGING);
      if (seg->name == stabstr_secname)
        seg->name = xstrdup (stabstr_secname);
#endif
    }

  if (length > 0)
    {                           /* Ordinary case.  */
      p = frag_more (length + 1);
      strcpy (p, string);

      seg_info (seg)->stabu.stab_string_size += length + 1;
    }
  else
    retval = 0;

  subseg_set (save_seg, save_subseg);

  return retval;
}

#ifdef AOUT_STABS
#ifndef OBJ_PROCESS_STAB
#define OBJ_PROCESS_STAB(SEG,W,S,T,O,D) aout_process_stab(W,S,T,O,D)
#endif

/* Here instead of obj-aout.c because other formats use it too.  */
void
aout_process_stab (what, string, type, other, desc)
     int what;
     const char *string;
     int type, other, desc;
{
  /* Put the stab information in the symbol table.  */
  symbolS *symbol;

  /* Create the symbol now, but only insert it into the symbol chain
     after any symbols mentioned in the value expression get into the
     symbol chain.  This is to avoid "continuation symbols" (where one
     ends in "\" and the debug info is continued in the next .stabs
     directive) from being separated by other random symbols.  */
  symbol = symbol_create (string, undefined_section, 0,
                          (struct frag *) NULL);
  if (what == 's' || what == 'n')
    {
      /* Pick up the value from the input line.  */
      symbol_set_frag (symbol, &zero_address_frag);
      pseudo_set (symbol);
    }
  else
    {
      /* .stabd sets the name to NULL.  Why?  */
      S_SET_NAME (symbol, NULL);
      symbol_set_frag (symbol, frag_now);
      S_SET_VALUE (symbol, (valueT) frag_now_fix ());
    }

  symbol_append (symbol, symbol_lastP, &symbol_rootP, &symbol_lastP);

  S_SET_TYPE (symbol, type);
  S_SET_OTHER (symbol, other);
  S_SET_DESC (symbol, desc);
}
#endif

/* This can handle different kinds of stabs (s,n,d) and different
   kinds of stab sections.  */

static void
s_stab_generic (what, stab_secname, stabstr_secname)
     int what;
     char *stab_secname;
     char *stabstr_secname;
{
  long longint;
  char *string, *saved_string_obstack_end;
  int type;
  int other;
  int desc;

  /* The general format is:
     .stabs "STRING",TYPE,OTHER,DESC,VALUE
     .stabn TYPE,OTHER,DESC,VALUE
     .stabd TYPE,OTHER,DESC
     At this point input_line_pointer points after the pseudo-op and
     any trailing whitespace.  The argument what is one of 's', 'n' or
     'd' indicating which type of .stab this is.  */

  if (what != 's')
    {
      string = "";
      saved_string_obstack_end = 0;
    }
  else
    {
      int length;

      string = demand_copy_C_string (&length);
      /* FIXME: We should probably find some other temporary storage
         for string, rather than leaking memory if someone else
         happens to use the notes obstack.  */
      saved_string_obstack_end = notes.next_free;
      SKIP_WHITESPACE ();
      if (*input_line_pointer == ',')
        input_line_pointer++;
      else
        {
          as_warn (_(".stabs: Missing comma"));
          ignore_rest_of_line ();
          return;
        }
    }

  if (get_absolute_expression_and_terminator (&longint) != ',')
    {
      as_warn (_(".stab%c: Missing comma"), what);
      ignore_rest_of_line ();
      return;
    }
  type = longint;

  if (get_absolute_expression_and_terminator (&longint) != ',')
    {
      as_warn (_(".stab%c: Missing comma"), what);
      ignore_rest_of_line ();
      return;
    }
  other = longint;

  desc = get_absolute_expression ();
  if (what == 's' || what == 'n')
    {
      if (*input_line_pointer != ',')
        {
          as_warn (_(".stab%c: Missing comma"), what);
          ignore_rest_of_line ();
          return;
        }
      input_line_pointer++;
      SKIP_WHITESPACE ();
    }

#ifdef TC_PPC
#ifdef OBJ_ELF
  /* Solaris on PowerPC has decided that .stabd can take 4 arguments, so if we were
     given 4 arguments, make it a .stabn */
  else if (what == 'd')
    {
      char *save_location = input_line_pointer;

      SKIP_WHITESPACE ();
      if (*input_line_pointer == ',')
        {
          input_line_pointer++;
          what = 'n';
        }
      else
        input_line_pointer = save_location;
    }
#endif /* OBJ_ELF */
#endif /* TC_PPC */

#ifndef NO_LISTING
  if (listing)
    {