Initial revision

[gcc.git] / gcc / dbxout.c

/* Output dbx-format symbol table information from GNU compiler.
   Copyright (C) 1987, 1988, 1992 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC 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.

GNU CC 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 GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */


/* Output dbx-format symbol table data.
   This consists of many symbol table entries, each of them
   a .stabs assembler pseudo-op with four operands:
   a "name" which is really a description of one symbol and its type,
   a "code", which is a symbol defined in stab.h whose name starts with N_,
   an unused operand always 0,
   and a "value" which is an address or an offset.
   The name is enclosed in doublequote characters.

   Each function, variable, typedef, and structure tag
   has a symbol table entry to define it.
   The beginning and end of each level of name scoping within
   a function are also marked by special symbol table entries.

   The "name" consists of the symbol name, a colon, a kind-of-symbol letter,
   and a data type number.  The data type number may be followed by
   "=" and a type definition; normally this will happen the first time
   the type number is mentioned.  The type definition may refer to
   other types by number, and those type numbers may be followed
   by "=" and nested definitions.

   This can make the "name" quite long.
   When a name is more than 80 characters, we split the .stabs pseudo-op
   into two .stabs pseudo-ops, both sharing the same "code" and "value".
   The first one is marked as continued with a double-backslash at the
   end of its "name".

   The kind-of-symbol letter distinguished function names from global
   variables from file-scope variables from parameters from auto
   variables in memory from typedef names from register variables.
   See `dbxout_symbol'.

   The "code" is mostly redundant with the kind-of-symbol letter
   that goes in the "name", but not entirely: for symbols located
   in static storage, the "code" says which segment the address is in,
   which controls how it is relocated.

   The "value" for a symbol in static storage
   is the core address of the symbol (actually, the assembler
   label for the symbol).  For a symbol located in a stack slot
   it is the stack offset; for one in a register, the register number.
   For a typedef symbol, it is zero.

   If DEBUG_SYMS_TEXT is defined, all debugging symbols must be
   output while in the text section.

   For more on data type definitions, see `dbxout_type'.  */

/* Include these first, because they may define MIN and MAX.  */
#include <stdio.h>
#include <sys/param.h>
#include <errno.h>

#include "config.h"
#include "tree.h"
#include "rtl.h"
#include "flags.h"
#include "regs.h"
#include "insn-config.h"
#include "reload.h"

#ifndef errno
extern int errno;
#endif

#ifndef ASM_STABS_OP
#define ASM_STABS_OP ".stabs"
#endif

#ifndef ASM_STABN_OP
#define ASM_STABN_OP ".stabn"
#endif

/* Nonzero means if the type has methods, only output debugging
   information if methods are actually written to the asm file.  */

static int flag_minimal_debug = 1;

/* Nonzero if we have actually used any of the GDB extensions
   to the debugging format.  The idea is that we use them for the
   first time only if there's a strong reason, but once we have done that,
   we use them whenever convenient.  */

static int have_used_extensions = 0;

/* Virtually every UN*X system now in common use (except for pre-4.3-tahoe
   BSD systems) now provides getcwd as called for by POSIX.  Allow for
   the few exceptions to the general rule here.  */

#if !(defined (USG) || defined (VMS))
extern char *getwd ();
#define getcwd(buf,len) getwd(buf)
#define GUESSPATHLEN (MAXPATHLEN + 1)
#else /* (defined (USG) || defined (VMS)) */
extern char *getcwd ();
/* We actually use this as a starting point, not a limit.  */
#define GUESSPATHLEN 100
#endif /* (defined (USG) || defined (VMS)) */

/* Typical USG systems don't have stab.h, and they also have
   no use for DBX-format debugging info.  */

#ifdef DBX_DEBUGGING_INFO

#ifdef DEBUG_SYMS_TEXT
#define FORCE_TEXT text_section ();
#else
#define FORCE_TEXT
#endif

#ifdef USG
#include "gstab.h"  /* If doing DBX on sysV, use our own stab.h.  */
#else
#include <stab.h>  /* On BSD, use the system's stab.h.  */

/* This is a GNU extension we need to reference in this file.  */
#ifndef N_CATCH
#define N_CATCH 0x54
#endif
#endif /* not USG */

#ifdef __GNU_STAB__
#define STAB_CODE_TYPE enum __stab_debug_code
#else
#define STAB_CODE_TYPE int
#endif

/* 1 if PARM is passed to this function in memory.  */

#define PARM_PASSED_IN_MEMORY(PARM) \
 (GET_CODE (DECL_INCOMING_RTL (PARM)) == MEM)

/* A C expression for the integer offset value of an automatic variable
   (N_LSYM) having address X (an RTX).  */
#ifndef DEBUGGER_AUTO_OFFSET
#define DEBUGGER_AUTO_OFFSET(X) \
  (GET_CODE (X) == PLUS ? INTVAL (XEXP (X, 1)) : 0)
#endif

/* A C expression for the integer offset value of an argument (N_PSYM)
   having address X (an RTX).  The nominal offset is OFFSET.  */
#ifndef DEBUGGER_ARG_OFFSET
#define DEBUGGER_ARG_OFFSET(OFFSET, X) (OFFSET)
#endif

/* Stream for writing to assembler file.  */

static FILE *asmfile;

/* Last source file name mentioned in a NOTE insn.  */

static char *lastfile;

/* Current working directory.  */

static char *cwd;
static enum {not_gotten, gotten, error_getting} cwd_status = not_gotten;

enum typestatus {TYPE_UNSEEN, TYPE_XREF, TYPE_DEFINED};

/* Vector recording the status of describing C data types.
   When we first notice a data type (a tree node),
   we assign it a number using next_type_number.
   That is its index in this vector.
   The vector element says whether we have yet output
   the definition of the type.  TYPE_XREF says we have
   output it as a cross-reference only.  */

enum typestatus *typevec;

/* Number of elements of space allocated in `typevec'.  */

static int typevec_len;

/* In dbx output, each type gets a unique number.
   This is the number for the next type output.
   The number, once assigned, is in the TYPE_SYMTAB_ADDRESS field.  */

static int next_type_number;

/* In dbx output, we must assign symbol-blocks id numbers
   in the order in which their beginnings are encountered.
   We output debugging info that refers to the beginning and
   end of the ranges of code in each block
   with assembler labels LBBn and LBEn, where n is the block number.
   The labels are generated in final, which assigns numbers to the
   blocks in the same way.  */

static int next_block_number;

/* These variables are for dbxout_symbol to communicate to
   dbxout_finish_symbol.
   current_sym_code is the symbol-type-code, a symbol N_... define in stab.h.
   current_sym_value and current_sym_addr are two ways to address the
   value to store in the symtab entry.
   current_sym_addr if nonzero represents the value as an rtx.
   If that is zero, current_sym_value is used.  This is used
   when the value is an offset (such as for auto variables,
   register variables and parms).  */

static STAB_CODE_TYPE current_sym_code;
static int current_sym_value;
static rtx current_sym_addr;

/* Number of chars of symbol-description generated so far for the
   current symbol.  Used by CHARS and CONTIN.  */

static int current_sym_nchars;

/* Report having output N chars of the current symbol-description.  */

#define CHARS(N) (current_sym_nchars += (N))

/* Break the current symbol-description, generating a continuation,
   if it has become long.  */

#ifndef DBX_CONTIN_LENGTH
#define DBX_CONTIN_LENGTH 80
#endif

#if DBX_CONTIN_LENGTH > 0
#define CONTIN  \
  do {if (current_sym_nchars > DBX_CONTIN_LENGTH) dbxout_continue ();} while (0)
#else
#define CONTIN
#endif

void dbxout_types ();
void dbxout_args ();
void dbxout_symbol ();
static void dbxout_type_name ();
static void dbxout_type ();
static void dbxout_typedefs ();
static void dbxout_prepare_symbol ();
static void dbxout_finish_symbol ();
static void dbxout_continue ();
static void print_int_cst_octal ();
static void print_octal ();
\f
#if 0 /* Not clear we will actually need this.  */

/* Return the absolutized filename for the given relative
   filename.  Note that if that filename is already absolute, it may
   still be returned in a modified form because this routine also
   eliminates redundant slashes and single dots and eliminates double
   dots to get a shortest possible filename from the given input
   filename.  The absolutization of relative filenames is made by
   assuming that the given filename is to be taken as relative to
   the first argument (cwd) or to the current directory if cwd is
   NULL.  */

static char *
abspath (rel_filename)
     char *rel_filename;
{
  /* Setup the current working directory as needed.  */
  char *abs_buffer
    = (char *) alloca (strlen (cwd) + strlen (rel_filename) + 1);
  char *endp = abs_buffer;
  char *outp, *inp;
  char *value;

  /* Copy the  filename (possibly preceeded by the current working
     directory name) into the absolutization buffer.  */

  {
    char *src_p;

    if (rel_filename[0] != '/')
      {
        src_p = cwd;
        while (*endp++ = *src_p++)
          continue;
        *(endp-1) = '/';                        /* overwrite null */
      }
    src_p = rel_filename;
    while (*endp++ = *src_p++)
      continue;
    if (endp[-1] == '/')
      *endp = '\0';
  }

  /* Now make a copy of abs_buffer into abs_buffer, shortening the
     filename (by taking out slashes and dots) as we go.  */

  outp = inp = abs_buffer;
  *outp++ = *inp++;             /* copy first slash */
  for (;;)
    {
      if (!inp[0])
        break;
      else if (inp[0] == '/' && outp[-1] == '/')
        {
          inp++;
          continue;
        }
      else if (inp[0] == '.' && outp[-1] == '/')
        {
          if (!inp[1])
                  break;
          else if (inp[1] == '/')
            {
                    inp += 2;
                    continue;
            }
          else if ((inp[1] == '.') && (inp[2] == 0 || inp[2] == '/'))
            {
                    inp += (inp[2] == '/') ? 3 : 2;
                    outp -= 2;
                    while (outp >= abs_buffer && *outp != '/')
                outp--;
                    if (outp < abs_buffer)
                {
                  /* Catch cases like /.. where we try to backup to a
                     point above the absolute root of the logical file
                     system.  */

                  fprintf (stderr, "%s: invalid file name: %s\n",
                           pname, rel_filename);
                  exit (1);
                }
                    *++outp = '\0';
                    continue;
            }
        }
      *outp++ = *inp++;
    }

  /* On exit, make sure that there is a trailing null, and make sure that
     the last character of the returned string is *not* a slash.  */

  *outp = '\0';
  if (outp[-1] == '/')
    *--outp  = '\0';

  /* Make a copy (in the heap) of the stuff left in the absolutization
     buffer and return a pointer to the copy.  */

  value = (char *) oballoc (strlen (abs_buffer) + 1);
  strcpy (value, abs_buffer);
  return value;
}
#endif /* 0 */
\f
/* At the beginning of compilation, start writing the symbol table.
   Initialize `typevec' and output the standard data types of C.  */

void
dbxout_init (asm_file, input_file_name, syms)
     FILE *asm_file;
     char *input_file_name;
     tree syms;
{
  char ltext_label_name[100];

  asmfile = asm_file;

  typevec_len = 100;
  typevec = (enum typestatus *) xmalloc (typevec_len * sizeof typevec[0]);
  bzero (typevec, typevec_len * sizeof typevec[0]);

  /* Convert Ltext into the appropriate format for local labels in case
     the system doesn't insert underscores in front of user generated
     labels.  */
  ASM_GENERATE_INTERNAL_LABEL (ltext_label_name, "Ltext", 0);

  /* Put the current working directory in an N_SO symbol.  */
  {
    int size;

    if (cwd_status == not_gotten)
      {
        char *value;

        /* Read the working directory, avoiding arbitrary limit.  */
        size = GUESSPATHLEN;
        while (1)
          {
            cwd = (char *) xmalloc (size);
            value = getcwd (cwd, size);
            if (value != 0 || errno != ERANGE)
              break;
            free (cwd);
            size *= 2;
          }

        if (value != 0)
          cwd_status = gotten;
        else
          cwd_status = error_getting;
      }

    if (cwd_status == gotten)
      {
#ifdef DBX_OUTPUT_MAIN_SOURCE_DIRECTORY
        DBX_OUTPUT_MAIN_SOURCE_DIRECTORY (asmfile, cwd);
#else /* no DBX_OUTPUT_MAIN_SOURCE_DIRECTORY */
        fprintf (asmfile, "%s \"%s/\",%d,0,0,%s\n", ASM_STABS_OP,
                 cwd, N_SO, &ltext_label_name[1]);
#endif /* no DBX_OUTPUT_MAIN_SOURCE_DIRECTORY */
      }
  }

#ifdef DBX_OUTPUT_MAIN_SOURCE_FILENAME
  /* This should NOT be DBX_OUTPUT_SOURCE_FILENAME. That
     would give us an N_SOL, and we want an N_SO.  */
  DBX_OUTPUT_MAIN_SOURCE_FILENAME (asmfile, input_file_name);
#else /* no DBX_OUTPUT_MAIN_SOURCE_FILENAME */
  /* We include outputting `Ltext:' here,
     because that gives you a way to override it.  */
  /* Used to put `Ltext:' before the reference, but that loses on sun 4.  */
  fprintf (asmfile, "%s \"%s\",%d,0,0,%s\n", ASM_STABS_OP, input_file_name,
           N_SO, &ltext_label_name[1]);
  text_section ();
  ASM_OUTPUT_INTERNAL_LABEL (asmfile, "Ltext", 0);
#endif /* no DBX_OUTPUT_MAIN_SOURCE_FILENAME */

  lastfile = input_file_name;

  next_type_number = 1;
  next_block_number = 2;

  /* Make sure that types `int' and `char' have numbers 1 and 2.
     Definitions of other integer types will refer to those numbers.
     (Actually it should no longer matter what their numbers are.
     Also, if any types with tags have been defined, dbxout_symbol
     will output them first, so the numbers won't be 1 and 2.  That
     happens in C++.  So it's a good thing it should no longer matter).  */

#ifdef DBX_OUTPUT_STANDARD_TYPES
  DBX_OUTPUT_STANDARD_TYPES (syms);
#else
  dbxout_symbol (TYPE_NAME (integer_type_node), 0);
  dbxout_symbol (TYPE_NAME (char_type_node), 0);
#endif

  /* Get all permanent types that have typedef names,
     and output them all, except for those already output.  */

  dbxout_typedefs (syms);
}

/* Output any typedef names for types described by TYPE_DECLs in SYMS,
   in the reverse order from that which is found in SYMS.  */

static void
dbxout_typedefs (syms)
     tree syms;
{
  if (syms)
    {
      dbxout_typedefs (TREE_CHAIN (syms));
      if (TREE_CODE (syms) == TYPE_DECL)
        {
          tree type = TREE_TYPE (syms);
          if (TYPE_NAME (type)
              && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
              && ! TREE_ASM_WRITTEN (TYPE_NAME (type)))
            dbxout_symbol (TYPE_NAME (type), 0);
        }
    }
}

/* Output debugging info to FILE to switch to sourcefile FILENAME.  */

void
dbxout_source_file (file, filename)
     FILE *file;
     char *filename;
{
  char ltext_label_name[100];

  if (filename && (lastfile == 0 || strcmp (filename, lastfile)))
    {
#ifdef DBX_OUTPUT_SOURCE_FILENAME
      DBX_OUTPUT_SOURCE_FILENAME (file, filename);
#else
      ASM_GENERATE_INTERNAL_LABEL (ltext_label_name, "Ltext", 0);
      fprintf (file, "%s \"%s\",%d,0,0,%s\n", ASM_STABS_OP,
               filename, N_SOL, &ltext_label_name[1]);
#endif
      lastfile = filename;
    }
}

/* At the end of compilation, finish writing the symbol table.
   Unless you define DBX_OUTPUT_MAIN_SOURCE_FILE_END, the default is
   to do nothing. */

void
dbxout_finish (file, filename)
     FILE *file;
     char *filename;
{
#ifdef DBX_OUTPUT_MAIN_SOURCE_FILE_END
  DBX_OUTPUT_MAIN_SOURCE_FILE_END (file, filename);
#endif /* DBX_OUTPUT_MAIN_SOURCE_FILE_END */
}

/* Continue a symbol-description that gets too big.
   End one symbol table entry with a double-backslash
   and start a new one, eventually producing something like
   .stabs "start......\\",code,0,value
   .stabs "...rest",code,0,value   */

static void
dbxout_continue ()
{
#ifdef DBX_CONTIN_CHAR
  fprintf (asmfile, "%c", DBX_CONTIN_CHAR);
#else
  fprintf (asmfile, "\\\\");
#endif
  dbxout_finish_symbol (0);
  fprintf (asmfile, "%s \"", ASM_STABS_OP);
  current_sym_nchars = 0;
}
\f
/* Subtroutine of `dbxout_type'.  Output the type fields of TYPE.
   This must be a separate function because anonymous unions require
   recursive calls.  */

static void
dbxout_type_fields (type)
     tree type;
{
  tree tem;
  for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem))
    {
      /* Output the name, type, position (in bits), size (in bits)
         of each field.  */
      if (DECL_NAME (tem) == NULL_TREE
          && TREE_CODE (TREE_TYPE (tem)) == UNION_TYPE)
        dbxout_type_fields (TREE_TYPE (tem));
      /* Omit here local type decls until we know how to support them.  */
      else if (TREE_CODE (tem) == TYPE_DECL)
        continue;
      /* Omit here the nameless fields that are used to skip bits.  */
      else if (DECL_NAME (tem) != 0 && TREE_CODE (tem) != CONST_DECL)
        {
          /* Continue the line if necessary,
             but not before the first field.  */
          if (tem != TYPE_FIELDS (type))
            CONTIN;

          if (use_gdb_dbx_extensions
              && flag_minimal_debug
              && TREE_CODE (tem) == FIELD_DECL
              && DECL_VIRTUAL_P (tem)
              && DECL_ASSEMBLER_NAME (tem))
            {
              have_used_extensions = 1;
              CHARS (3 + IDENTIFIER_LENGTH (DECL_NAME (TYPE_NAME (DECL_FCONTEXT (tem)))));
              fputs (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (tem)), asmfile);
              dbxout_type (DECL_FCONTEXT (tem), 0);
              fprintf (asmfile, ":");
              dbxout_type (TREE_TYPE (tem), 0);
              fprintf (asmfile, ",%d;",
                       TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem)));
              continue;
            }

          fprintf (asmfile, "%s:", IDENTIFIER_POINTER (DECL_NAME (tem)));
          CHARS (2 + IDENTIFIER_LENGTH (DECL_NAME (tem)));

          if (use_gdb_dbx_extensions
              && (TREE_PRIVATE (tem) || TREE_PROTECTED (tem)
                  || TREE_CODE (tem) != FIELD_DECL))
            {
              have_used_extensions = 1;
              putc ('/', asmfile);
              putc ((TREE_PRIVATE (tem) ? '0'
                     : TREE_PROTECTED (tem) ? '1' : '2'),
                    asmfile);
              CHARS (2);
            }

          dbxout_type ((TREE_CODE (tem) == FIELD_DECL
                        && DECL_BIT_FIELD_TYPE (tem))
                       ? DECL_BIT_FIELD_TYPE (tem)
                       : TREE_TYPE (tem), 0);

          if (TREE_CODE (tem) == VAR_DECL)
            {
              if (TREE_STATIC (tem) && use_gdb_dbx_extensions)
                {
                  char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (tem));
                  have_used_extensions = 1;

#if 0 /* ??? Comment below makes it clear this is unacceptable.  */
                  /* Adding 1 here only works on systems
                     which flush an initial underscore from
                     the .stabs entry.  This loses for static names
                     which have an initial leading '_' on systems which
                     don't use leading underscores.  */
                  if (name[0] == '_')
                    name += 1;
#endif

                  fprintf (asmfile, ":%s;", name);
                  CHARS (strlen (name));
                }
              else
                {
                  /* If TEM is non-static, GDB won't understand it.  */
                  fprintf (asmfile, ",0,0;");
                }
            }
          else if (TREE_CODE (DECL_FIELD_BITPOS (tem)) == INTEGER_CST)
            {
              fprintf (asmfile, ",%d,%d;",
                       TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem)),
                       TREE_INT_CST_LOW (DECL_SIZE (tem)));
            }
          else
            /* This has yet to be implemented.  */
            abort ();
          CHARS (23);
        }
    }
}
\f
/* Subtroutine of `dbxout_type_methods'.  Output debug info about the
   method described DECL.  DEBUG_NAME is an encoding of the method's
   type signature.  ??? We may be able to do without DEBUG_NAME altogether
   now.  */

static void
dbxout_type_method_1 (decl, debug_name)
     tree decl;
     char *debug_name;
{
  tree firstarg = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)));
  char c1 = 'A', c2;

  if (TREE_CODE (TREE_TYPE (decl)) == FUNCTION_TYPE)
    c2 = '?';
  else /* it's a METHOD_TYPE.  */
    {
      /* A for normal functions.
         B for `const' member functions.
         C for `volatile' member functions.
         D for `const volatile' member functions.  */
      if (TYPE_READONLY (TREE_TYPE (firstarg)))
        c1 += 1;
      if (TYPE_VOLATILE (TREE_TYPE (firstarg)))
        c1 += 2;

      if (DECL_VINDEX (decl))
        c2 = '*';
      else
        c2 = '.';
    }

  fprintf (asmfile, ":%s;%c%c%c", debug_name,
           TREE_PRIVATE (decl) ? '0' : TREE_PROTECTED (decl) ? '1' : '2', c1, c2);
  CHARS (IDENTIFIER_LENGTH (DECL_ASSEMBLER_NAME (decl)) + 6
         - (debug_name - IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
  if (DECL_VINDEX (decl))
    {
      fprintf (asmfile, "%d;",
               TREE_INT_CST_LOW (DECL_VINDEX (decl)));
      dbxout_type (DECL_CONTEXT (decl), 0);
      fprintf (asmfile, ";");
      CHARS (8);
    }
}
\f
/* Subroutine of `dbxout_type'.  Output debug info about the methods defined
   in TYPE.  */

static void
dbxout_type_methods (type)
     register tree type;
{
  /* C++: put out the method names and their parameter lists */
  tree ctor_name;
  tree methods = TYPE_METHODS (type);
  register tree fndecl;
  register tree last;
  register int type_identifier_length;

  if (methods == NULL_TREE)
    return;

  ctor_name = DECL_NAME (TYPE_NAME (type));
  type_identifier_length = IDENTIFIER_LENGTH (ctor_name);
  if (TREE_CODE (methods) == FUNCTION_DECL)
    fndecl = methods;
  else if (TREE_VEC_ELT (methods, 0) != NULL_TREE)
    fndecl = TREE_VEC_ELT (methods, 0);
  else fndecl = TREE_VEC_ELT (methods, 1);

  if (TREE_CODE (type) == RECORD_TYPE && DECL_NAME (fndecl) == ctor_name)
    {
      tree ctor = fndecl;
      tree dtor;

      /* Destructors lie in a special place.
         n.b.  TYPE_HAS_DESTRUCTOR == TYPE_LANG_FLAG_2 */
      if (TYPE_LANG_FLAG_2 (type))
        {
          dtor = fndecl;
          fndecl = ctor = TREE_CHAIN (dtor);
        }
      else
        dtor = NULL_TREE;

      CHARS (2);

      if (ctor)
        {
          int need_prefix = 1;

          while (ctor)
            {
              /* Output the name of the field (after overloading), as
                 well as the name of the field before overloading, along
                 with its parameter list.  */
              char *debug_name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (ctor));
              int old_minimal_debug = flag_minimal_debug;

              CONTIN;

              if (DECL_NAME (ctor) == ctor_name && ! DECL_IGNORED_P (ctor))
                {
                  if (need_prefix)
                    {
                      fprintf (asmfile, "%s::", IDENTIFIER_POINTER (DECL_NAME (ctor)));
                      CHARS (IDENTIFIER_LENGTH (DECL_NAME (ctor)) + 3);
                      need_prefix = 0;
                    }

                  if (ctor == dtor)
                    /* Always output destructors with full information.  */
                    flag_minimal_debug = 0;

                  dbxout_type (TREE_TYPE (ctor), 0);
                  flag_minimal_debug = old_minimal_debug;

                  if (flag_minimal_debug && ctor != dtor)
                    {
                      /* Cut down on debugging information by not outputting
                         the parts of the name we can just as easily
                         have the debugger figure out.  */

                      /* Get past '__'.  */
                      debug_name += 2;
                      /* Get past const and volatile qualifiers.  */
                      while (*debug_name == 'C' || *debug_name == 'V')
                        debug_name++;
                      /* Get past numeric type length prefix.  */
                      while (*debug_name >= '0' && *debug_name <= '9')
                        debug_name++;
                      /* Get past type of `this'.  */
                      debug_name += type_identifier_length;
                    }
                  dbxout_type_method_1 (ctor, debug_name);
                }

              if (ctor == dtor)
                break;

              ctor = TREE_CHAIN (ctor);
              if (ctor == NULL_TREE || DECL_NAME (ctor) != ctor_name)
                {
                  fndecl = ctor;
                  ctor = dtor;
                }
            }
          if (! need_prefix)
            putc (';', asmfile);
        }
    }

  while (fndecl)
    {
      tree name = DECL_NAME (fndecl);
      fprintf (asmfile, "%s::", IDENTIFIER_POINTER (name));
      CHARS (IDENTIFIER_LENGTH (name) + 3);

      for (last = NULL_TREE;
           fndecl && (last == NULL_TREE || DECL_NAME (fndecl) == DECL_NAME (last));
           fndecl = TREE_CHAIN (fndecl))
        /* Output the name of the field (after overloading), as
           well as the name of the field before overloading, along
           with its parameter list */
        {
          char *debug_name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl));

          CONTIN;

          last = fndecl;
          dbxout_type (TREE_TYPE (fndecl), 0);
          if (flag_minimal_debug)
            {
              debug_name += IDENTIFIER_LENGTH (DECL_NAME (fndecl)) + 2;
              /* Get past const and volatile qualifiers.  */
              while (*debug_name == 'C' || *debug_name == 'V')
                debug_name++;
              while (*debug_name >= '0' && *debug_name <= '9')
                debug_name++;
              debug_name += type_identifier_length;
            }
          dbxout_type_method_1 (fndecl, debug_name);
        }
      putc (';', asmfile);
      CHARS (1);
    }
}
\f
/* Output a reference to a type.  If the type has not yet been
   described in the dbx output, output its definition now.
   For a type already defined, just refer to its definition
   using the type number.

   If FULL is nonzero, and the type has been described only with
   a forward-reference, output the definition now.
   If FULL is zero in this case, just refer to the forward-reference
   using the number previously allocated.  */

static void
dbxout_type (type, full)
     tree type;
     int full;
{
  register tree tem;

  /* If there was an input error and we don't really have a type,
     avoid crashing and write something that is at least valid
     by assuming `int'.  */
  if (type == error_mark_node)
    type = integer_type_node;
  else
    {
      type = TYPE_MAIN_VARIANT (type);
      if (TYPE_NAME (type)
          && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
          && DECL_IGNORED_P (TYPE_NAME (type)))
        full = 0;
    }

  if (TYPE_SYMTAB_ADDRESS (type) == 0)
    {
      /* Type has no dbx number assigned.  Assign next available number.  */
      TYPE_SYMTAB_ADDRESS (type) = next_type_number++;

      /* Make sure type vector is long enough to record about this type.  */

      if (next_type_number == typevec_len)
        {
          typevec = (enum typestatus *) xrealloc (typevec, typevec_len * 2 * sizeof typevec[0]);
          bzero (typevec + typevec_len, typevec_len * sizeof typevec[0]);
          typevec_len *= 2;
        }
    }

  /* Output the number of this type, to refer to it.  */
  fprintf (asmfile, "%d", TYPE_SYMTAB_ADDRESS (type));
  CHARS (3);

  /* If this type's definition has been output or is now being output,
     that is all.  */

  switch (typevec[TYPE_SYMTAB_ADDRESS (type)])
    {
    case TYPE_UNSEEN:
      break;
    case TYPE_XREF:
      if (! full)
        return;
      break;
    case TYPE_DEFINED:
      return;
    }

#ifdef DBX_NO_XREFS
  /* For systems where dbx output does not allow the `=xsNAME:' syntax,
     leave the type-number completely undefined rather than output
     a cross-reference.  */
  if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
      || TREE_CODE (type) == ENUMERAL_TYPE)

    if ((TYPE_NAME (type) != 0 && !full)
        || TYPE_SIZE (type) == 0)
      {
        typevec[TYPE_SYMTAB_ADDRESS (type)] = TYPE_XREF;
        return;
      }
#endif

  /* Output a definition now.  */

  fprintf (asmfile, "=");
  CHARS (1);

  /* Mark it as defined, so that if it is self-referent
     we will not get into an infinite recursion of definitions.  */

  typevec[TYPE_SYMTAB_ADDRESS (type)] = TYPE_DEFINED;

  switch (TREE_CODE (type))
    {
    case VOID_TYPE:
    case LANG_TYPE:
      /* For a void type, just define it as itself; ie, "5=5".
         This makes us consider it defined
         without saying what it is.  The debugger will make it
         a void type when the reference is seen, and nothing will
         ever override that default.  */
      fprintf (asmfile, "%d", TYPE_SYMTAB_ADDRESS (type));
      CHARS (3);
      break;

    case INTEGER_TYPE:
      if (type == char_type_node && ! TREE_UNSIGNED (type))
        /* Output the type `char' as a subrange of itself!
           I don't understand this definition, just copied it
           from the output of pcc.
           This used to use `r2' explicitly and we used to
           take care to make sure that `char' was type number 2.  */
        fprintf (asmfile, "r%d;0;127;", TYPE_SYMTAB_ADDRESS (type));
#ifdef WINNING_GDB
      else if (TYPE_PRECISION (type) > BITS_PER_WORD)
        {
          /* This used to say `r1' and we used to take care
             to make sure that `int' was type number 1.  */
          fprintf (asmfile, "r%d;", TYPE_SYMTAB_ADDRESS (integer_type_node));
          print_int_cst_octal (TYPE_MIN_VALUE (type));
          fprintf (asmfile, ";");
          print_int_cst_octal (TYPE_MAX_VALUE (type));
          fprintf (asmfile, ";");
        }
#endif
      else
        /* Output other integer types as subranges of `int'.  */
        /* This used to say `r1' and we used to take care
           to make sure that `int' was type number 1.  */
        fprintf (asmfile, "r%d;%d;%d;",
                 TYPE_SYMTAB_ADDRESS (integer_type_node),
                 TREE_INT_CST_LOW (TYPE_MIN_VALUE (type)),
                 TREE_INT_CST_LOW (TYPE_MAX_VALUE (type)));
      CHARS (25);
      break;

    case REAL_TYPE:
      /* This used to say `r1' and we used to take care
         to make sure that `int' was type number 1.  */
      fprintf (asmfile, "r%d;%d;0;", TYPE_SYMTAB_ADDRESS (integer_type_node),
               TREE_INT_CST_LOW (size_in_bytes (type)));
      CHARS (16);
      break;

    case ARRAY_TYPE:
      /* Output "a" followed by a range type definition
         for the index type of the array
         followed by a reference to the target-type.
         ar1;0;N;M for an array of type M and size N.  */
      /* This used to say `r1' and we used to take care
         to make sure that `int' was type number 1.  */
      fprintf (asmfile, "ar%d;0;%d;", TYPE_SYMTAB_ADDRESS (integer_type_node),

               (TYPE_DOMAIN (type)
                ? TREE_INT_CST_LOW (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))
                : -1));
      CHARS (17);
      dbxout_type (TREE_TYPE (type), 0);
      break;

    case RECORD_TYPE:
    case UNION_TYPE:
      {
        int i, n_baseclasses = 0;

        if (TYPE_BINFO (type) != 0 && TYPE_BINFO_BASETYPES (type) != 0)
          n_baseclasses = TREE_VEC_LENGTH (TYPE_BINFO_BASETYPES (type));

        /* Output a structure type.  */
        if ((TYPE_NAME (type) != 0 && !full)
            || TYPE_SIZE (type) == 0)
          {
            /* If the type is just a cross reference, output one
               and mark the type as partially described.
               If it later becomes defined, we will output
               its real definition.
               If the type has a name, don't nest its definition within
               another type's definition; instead, output an xref
               and let the definition come when the name is defined.  */
            fprintf (asmfile, (TREE_CODE (type) == RECORD_TYPE) ? "xs" : "xu");
            CHARS (3);
#if 0                           /* This assertion is legitimately false in C++.  */
            /* We shouldn't be outputting a reference to a type before its
               definition unless the type has a tag name.
               A typedef name without a tag name should be impossible.  */
            if (TREE_CODE (TYPE_NAME (type)) != IDENTIFIER_NODE)
              abort ();
#endif
            dbxout_type_name (type);
            fprintf (asmfile, ":");
            typevec[TYPE_SYMTAB_ADDRESS (type)] = TYPE_XREF;
            break;
          }
        tem = size_in_bytes (type);

        /* The code below assumes the size is an integer constant.  */
        if (TREE_CODE (tem) != INTEGER_CST)
          abort ();

        /* Identify record or union, and print its size.  */
        fprintf (asmfile, (TREE_CODE (type) == RECORD_TYPE) ? "s%d" : "u%d",
                 TREE_INT_CST_LOW (tem));

        if (use_gdb_dbx_extensions)
          {
            if (n_baseclasses)
              {
                have_used_extensions = 1;
                fprintf (asmfile, "!%d,", n_baseclasses);
                CHARS (8);
              }
          }
        for (i = 0; i < n_baseclasses; i++)
          {
            tree child = TREE_VEC_ELT (BINFO_BASETYPES (TYPE_BINFO (type)), i);
            if (use_gdb_dbx_extensions)
              {
                have_used_extensions = 1;
                putc (TREE_VIA_VIRTUAL (child) ? '1'
                      : '0',
                      asmfile);
                putc (TREE_VIA_PUBLIC (child) ? '2'
                      : '0',
                      asmfile);
                fprintf (asmfile, "%d,",
                         TREE_INT_CST_LOW (BINFO_OFFSET (child)) * BITS_PER_UNIT);
                CHARS (15);
                dbxout_type (BINFO_TYPE (child), 0);
                putc (';', asmfile);
              }
            else
              {
                /* Print out the base class information with fields
                   which have the same names at the types they hold.  */
                dbxout_type_name (BINFO_TYPE (child));
                putc (':', asmfile);
                dbxout_type (BINFO_TYPE (child), full);
                fprintf (asmfile, ",%d,%d;",
                         TREE_INT_CST_LOW (BINFO_OFFSET (child)) * BITS_PER_UNIT,
                         TREE_INT_CST_LOW (DECL_SIZE (TYPE_NAME (BINFO_TYPE (child)))) * BITS_PER_UNIT);
                CHARS (20);
              }
          }
      }

      CHARS (11);

      /* Write out the field declarations.  */
      dbxout_type_fields (type);
      if (use_gdb_dbx_extensions)
        {
          have_used_extensions = 1;
          dbxout_type_methods (type);
        }
      putc (';', asmfile);

      if (use_gdb_dbx_extensions && TREE_CODE (type) == RECORD_TYPE
          /* Avoid the ~ if we don't really need it--it confuses dbx.  */
          && TYPE_VFIELD (type))
        {
          have_used_extensions = 1;

          /* Tell GDB+ that it may keep reading.  */
          putc ('~', asmfile);

          /* We need to write out info about what field this class
             uses as its "main" vtable pointer field, because if this
             field is inherited from a base class, GDB cannot necessarily
             figure out which field it's using in time.  */
          if (TYPE_VFIELD (type))
            {
              putc ('%', asmfile);
              dbxout_type (DECL_FCONTEXT (TYPE_VFIELD (type)), 0);
            }
          putc (';', asmfile);
          CHARS (3);
        }
      break;

    case ENUMERAL_TYPE:
      if ((TYPE_NAME (type) != 0 && !full
           && (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
               && ! DECL_IGNORED_P (TYPE_NAME (type))))
          || TYPE_SIZE (type) == 0)
        {
          fprintf (asmfile, "xe");
          CHARS (3);
          dbxout_type_name (type);
          typevec[TYPE_SYMTAB_ADDRESS (type)] = TYPE_XREF;
          fprintf (asmfile, ":");
          return;
        }
      putc ('e', asmfile);
      CHARS (1);
      for (tem = TYPE_VALUES (type); tem; tem = TREE_CHAIN (tem))
        {
          fprintf (asmfile, "%s:%d,", IDENTIFIER_POINTER (TREE_PURPOSE (tem)),
                   TREE_INT_CST_LOW (TREE_VALUE (tem)));
          CHARS (11 + IDENTIFIER_LENGTH (TREE_PURPOSE (tem)));
          if (TREE_CHAIN (tem) != 0)
            CONTIN;
        }
      putc (';', asmfile);
      CHARS (1);
      break;

    case POINTER_TYPE:
      putc ('*', asmfile);
      CHARS (1);
      dbxout_type (TREE_TYPE (type), 0);
      break;

    case METHOD_TYPE:
      if (use_gdb_dbx_extensions)
        {
          have_used_extensions = 1;
          putc ('#', asmfile);
          CHARS (1);
          if (flag_minimal_debug)
            {
              putc ('#', asmfile);
              dbxout_type (TREE_TYPE (type), 0);
              putc (';', asmfile);
              CHARS (1);
            }
          else
            {
              dbxout_type (TYPE_METHOD_BASETYPE (type), 0);
              putc (',', asmfile);
              CHARS (1);
              dbxout_type (TREE_TYPE (type), 0);
              dbxout_args (TYPE_ARG_TYPES (type));
              putc (';', asmfile);
              CHARS (1);
            }
        }
      else
        {
          /* Treat it as a function type.  */
          dbxout_type (TREE_TYPE (type), 0);
        }
      break;

    case OFFSET_TYPE:
      if (use_gdb_dbx_extensions)
        {
          have_used_extensions = 1;
          putc ('@', asmfile);
          CHARS (1);
          dbxout_type (TYPE_OFFSET_BASETYPE (type), 0);
          putc (',', asmfile);
          CHARS (1);
          dbxout_type (TREE_TYPE (type), 0);
        }
      else
        {
          /* Should print as an int, because it is really
             just an offset.  */
          dbxout_type (integer_type_node, 0);
        }
      break;

    case REFERENCE_TYPE:
      if (use_gdb_dbx_extensions)
        have_used_extensions = 1;
      putc (use_gdb_dbx_extensions ? '&' : '*', asmfile);
      CHARS (1);
      dbxout_type (TREE_TYPE (type), 0);
      break;

    case FUNCTION_TYPE:
      putc ('f', asmfile);
      CHARS (1);
      dbxout_type (TREE_TYPE (type), 0);
      break;

    default:
      abort ();
    }
}

/* Print the value of integer constant C, in octal,
   handling double precision.  */

static void
print_int_cst_octal (c)
     tree c;
{
  unsigned int high = TREE_INT_CST_HIGH (c);
  unsigned int low = TREE_INT_CST_LOW (c);
  int excess = (3 - (HOST_BITS_PER_INT % 3));

  fprintf (asmfile, "0");

  if (excess == 3)
    {
      print_octal (high, HOST_BITS_PER_INT / 3);
      print_octal (low, HOST_BITS_PER_INT / 3);
    }
  else
    {
      unsigned int beg = high >> excess;
      unsigned int middle
        = ((high & ((1 << excess) - 1)) << (3 - excess)
           | (low >> (HOST_BITS_PER_INT / 3 * 3)));
      unsigned int end = low & ((1 << (HOST_BITS_PER_INT / 3 * 3)) - 1);
      fprintf (asmfile, "%o%01o", beg, middle);
      print_octal (end, HOST_BITS_PER_INT / 3);
    }
}

static void
print_octal (value, digits)
     unsigned int value;
     int digits;
{
  int i;

  for (i = digits - 1; i >= 0; i--)
    fprintf (asmfile, "%01o", ((value >> (3 * i)) & 7));
}

/* Output the name of type TYPE, with no punctuation.
   Such names can be set up either by typedef declarations
   or by struct, enum and union tags.  */

static void
dbxout_type_name (type)
     register tree type;
{
  tree t;
  if (TYPE_NAME (type) == 0)
    abort ();
  if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
    {
      t = TYPE_NAME (type);
    }
  else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
    {
      t = DECL_NAME (TYPE_NAME (type));
    }
  else
    abort ();

  fprintf (asmfile, "%s", IDENTIFIER_POINTER (t));
  CHARS (IDENTIFIER_LENGTH (t));
}
\f
/* Output a .stabs for the symbol defined by DECL,
   which must be a ..._DECL node in the normal namespace.
   It may be a CONST_DECL, a FUNCTION_DECL, a PARM_DECL or a VAR_DECL.
   LOCAL is nonzero if the scope is less than the entire file.  */

void
dbxout_symbol (decl, local)
     tree decl;
     int local;
{
  int letter = 0;
  tree type = TREE_TYPE (decl);
  tree context = NULL_TREE;
  int regno = -1;

  /* Cast avoids warning in old compilers.  */
  current_sym_code = (STAB_CODE_TYPE) 0;
  current_sym_value = 0;
  current_sym_addr = 0;

  /* Ignore nameless syms, but don't ignore type tags.  */

  if ((DECL_NAME (decl) == 0 && TREE_CODE (decl) != TYPE_DECL)
      || DECL_IGNORED_P (decl))
    return;

  dbxout_prepare_symbol (decl);

  /* The output will always start with the symbol name,
     so always count that in the length-output-so-far.  */

  if (DECL_NAME (decl) != 0)
    current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (decl));

  switch (TREE_CODE (decl))
    {
    case CONST_DECL:
      /* Enum values are defined by defining the enum type.  */
      break;

    case FUNCTION_DECL:
      if (DECL_RTL (decl) == 0)
        return;
      if (TREE_EXTERNAL (decl))
        break;
      /* Don't mention a nested function under its parent.  */
      context = decl_function_context (decl);
      if (context == current_function_decl)
        break;
      if (GET_CODE (DECL_RTL (decl)) != MEM
          || GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF)
        break;
      FORCE_TEXT;

      fprintf (asmfile, "%s \"%s:%c", ASM_STABS_OP,
               IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
               TREE_PUBLIC (decl) ? 'F' : 'f');

      current_sym_code = N_FUN;
      current_sym_addr = XEXP (DECL_RTL (decl), 0);

      if (TREE_TYPE (type))
        dbxout_type (TREE_TYPE (type), 0);
      else
        dbxout_type (void_type_node, 0);

      /* For a nested function, when that function is compiled,
         mention the containing function name
         as well as (since dbx wants it) our own assembler-name.  */
      if (context != 0)
        fprintf (asmfile, ",%s,%s",
                 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
                 IDENTIFIER_POINTER (DECL_NAME (context)));

      dbxout_finish_symbol (decl);
      break;

    case TYPE_DECL:
#if 0
      /* This seems all wrong.  Outputting most kinds of types gives no name
         at all.  A true definition gives no name; a cross-ref for a
         structure can give the tag name, but not a type name.
         It seems that no typedef name is defined by outputting a type.  */

      /* If this typedef name was defined by outputting the type,
         don't duplicate it.  */
      if (typevec[TYPE_SYMTAB_ADDRESS (type)] == TYPE_DEFINED
          && TYPE_NAME (TREE_TYPE (decl)) == decl)
        return;
#endif
      /* Don't output the same typedef twice.
         And don't output what language-specific stuff doesn't want output.  */
      if (TREE_ASM_WRITTEN (decl) || DECL_IGNORED_P (decl))
        return;

      FORCE_TEXT;

      if (DECL_NAME (decl))
        {
          /* Output typedef name.  */
          fprintf (asmfile, "%s \"%s:", ASM_STABS_OP,
                   IDENTIFIER_POINTER (DECL_NAME (decl)));

          /* If there is a typedecl for this type with the same name
             as the tag, output an abbreviated form for that typedecl.  */
          if (use_gdb_dbx_extensions && have_used_extensions
              && (TREE_CODE (type) == RECORD_TYPE
                  || TREE_CODE (type) == UNION_TYPE)
              && (TYPE_NAME (type) == decl))
                {
                  putc ('T', asmfile);
                  TREE_ASM_WRITTEN (TYPE_NAME (type)) = 1;
                }
          putc ('t', asmfile);
          current_sym_code = N_LSYM;

          dbxout_type (type, 1);
          dbxout_finish_symbol (decl);
        }
      else if (TYPE_NAME (type) != 0 && !TREE_ASM_WRITTEN (TYPE_NAME (type)))
        {
          /* Output a tag (a TYPE_DECL with no name, but the type has a name).
             This is what represents `struct foo' with no typedef.  */
          /* In C++, the name of a type is the corresponding typedef.
             In C, it is an IDENTIFIER_NODE.  */
          tree name = TYPE_NAME (type);
          if (TREE_CODE (name) == TYPE_DECL)
            name = DECL_NAME (name);

          current_sym_code = N_LSYM;
          current_sym_value = 0;
          current_sym_addr = 0;
          current_sym_nchars = 2 + IDENTIFIER_LENGTH (name);

          fprintf (asmfile, "%s \"%s:T", ASM_STABS_OP,
                   IDENTIFIER_POINTER (name));
          dbxout_type (type, 1);
          dbxout_finish_symbol (0);
        }

      /* Prevent duplicate output of a typedef.  */
      TREE_ASM_WRITTEN (decl) = 1;
      break;

    case PARM_DECL:
      /* Parm decls go in their own separate chains
         and are output by dbxout_reg_parms and dbxout_parms.  */
      abort ();

    case RESULT_DECL:
      /* Named return value, treat like a VAR_DECL.  */
    case VAR_DECL:
      if (DECL_RTL (decl) == 0)
        return;
      /* Don't mention a variable that is external.
         Let the file that defines it describe it.  */
      if (TREE_EXTERNAL (decl))
        break;

      /* If the variable is really a constant
         and not written in memory, inform the debugger.  */
      if (TREE_STATIC (decl) && TREE_READONLY (decl)
          && DECL_INITIAL (decl) != 0
          && ! TREE_ASM_WRITTEN (decl)
          && (DECL_FIELD_CONTEXT (decl) == NULL_TREE
              || TREE_CODE (DECL_FIELD_CONTEXT (decl)) == BLOCK))
        {
          if (TREE_PUBLIC (decl) == 0)
            {
              /* The sun4 assembler does not grok this.  */
              char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
              if (TREE_CODE (TREE_TYPE (decl)) == INTEGER_TYPE
                  || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
                {
                  int ival = TREE_INT_CST_LOW (DECL_INITIAL (decl));
#ifdef DBX_OUTPUT_CONSTANT_SYMBOL
                  DBX_OUTPUT_CONSTANT_SYMBOL (asmfile, name, ival);
#else
                  fprintf (asmfile, "%s \"%s:c=i%d\",0x%x,0,0,0\n",
                           ASM_STABS_OP, name, ival, N_LSYM);
#endif
                  return;
                }
              else if (TREE_CODE (TREE_TYPE (decl)) == REAL_TYPE)
                {
                  /* don't know how to do this yet.  */
                }
              break;
            }
          /* else it is something we handle like a normal variable.  */
        }

      DECL_RTL (decl) = eliminate_regs (DECL_RTL (decl));
#ifdef LEAF_REG_REMAP
      if (leaf_function)
        leaf_renumber_regs_insn (DECL_RTL (decl));
#endif

      /* Don't mention a variable at all
         if it was completely optimized into nothingness.

         If DECL was from an inline function, then it's rtl
         is not identically the rtl that was used in this
         particular compilation.  */
      if (GET_CODE (DECL_RTL (decl)) == REG)
        {
          regno = REGNO (DECL_RTL (decl));
          if (regno >= FIRST_PSEUDO_REGISTER)
            regno = reg_renumber[REGNO (DECL_RTL (decl))];
          if (regno < 0)
            break;
        }
      else if (GET_CODE (DECL_RTL (decl)) == SUBREG)
        {
          rtx value = DECL_RTL (decl);
          int offset = 0;
          while (GET_CODE (value) == SUBREG)
            {
              offset += SUBREG_WORD (value);
              value = SUBREG_REG (value);
            }
          if (GET_CODE (value) == REG)
            {
              regno = REGNO (value);
              if (regno >= FIRST_PSEUDO_REGISTER)
                regno = reg_renumber[REGNO (value)];
              if (regno >= 0)
                regno += offset;
            }
        }

      /* The kind-of-variable letter depends on where
         the variable is and on the scope of its name:
         G and N_GSYM for static storage and global scope,
         S for static storage and file scope,
         V for static storage and local scope,
            for those two, use N_LCSYM if data is in bss segment,
            N_STSYM if in data segment, N_FUN otherwise.
            (We used N_FUN originally, then changed to N_STSYM
            to please GDB.  However, it seems that confused ld.
            Now GDB has been fixed to like N_FUN, says Kingdon.)
         no letter at all, and N_LSYM, for auto variable,
         r and N_RSYM for register variable.  */

      if (GET_CODE (DECL_RTL (decl)) == MEM
          && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
        {
          if (TREE_PUBLIC (decl))
            {
              letter = 'G';
              current_sym_code = N_GSYM;
            }
          else
            {
              current_sym_addr = XEXP (DECL_RTL (decl), 0);

              letter = TREE_PERMANENT (decl) ? 'S' : 'V';

              if (!DECL_INITIAL (decl))
                current_sym_code = N_LCSYM;
              else if (TREE_READONLY (decl) && ! TREE_THIS_VOLATILE (decl))
                /* This is not quite right, but it's the closest
                   of all the codes that Unix defines.  */
                current_sym_code = N_FUN;
              else
                {
/* Ultrix `as' seems to need this.  */
#ifdef DBX_STATIC_STAB_DATA_SECTION
                  data_section ();
#endif
                  current_sym_code = N_STSYM;
                }
            }
        }
      else if (regno >= 0)
        {
          letter = 'r';
          current_sym_code = N_RSYM;
          current_sym_value = DBX_REGISTER_NUMBER (regno);
        }
      else if (GET_CODE (DECL_RTL (decl)) == SUBREG)
        {
          rtx value = DECL_RTL (decl);
          int offset = 0;
          while (GET_CODE (value) == SUBREG)
            {
              offset += SUBREG_WORD (value);
              value = SUBREG_REG (value);
            }
          letter = 'r';
          current_sym_code = N_RSYM;
          current_sym_value = DBX_REGISTER_NUMBER (REGNO (value) + offset);
        }
      else if (GET_CODE (DECL_RTL (decl)) == MEM
               && (GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM
                   || (GET_CODE (XEXP (DECL_RTL (decl), 0)) == REG
                       && REGNO (XEXP (DECL_RTL (decl), 0)) != FRAME_POINTER_REGNUM)))
        /* If the value is indirect by memory or by a register
           that isn't the frame pointer
           then it means the object is variable-sized and address through
           that register or stack slot.  DBX has no way to represent this
           so all we can do is output the variable as a pointer.
           If it's not a parameter, ignore it.
           (VAR_DECLs like this can be made by integrate.c.)  */
        {
          if (GET_CODE (XEXP (DECL_RTL (decl), 0)) == REG)
            {
              letter = 'r';
              current_sym_code = N_RSYM;
              current_sym_value = DBX_REGISTER_NUMBER (REGNO (XEXP (DECL_RTL (decl), 0)));
            }
          else
            {
              current_sym_code = N_LSYM;
              /* DECL_RTL looks like (MEM (MEM (PLUS (REG...) (CONST_INT...)))).
                 We want the value of that CONST_INT.  */
              current_sym_value
                = DEBUGGER_AUTO_OFFSET (XEXP (XEXP (DECL_RTL (decl), 0), 0));
            }

          /* Effectively do build_pointer_type, but don't cache this type,
             since it might be temporary whereas the type it points to
             might have been saved for inlining.  */
          type = make_node (REFERENCE_TYPE);
          TREE_TYPE (type) = TREE_TYPE (decl);
        }
      else if (GET_CODE (DECL_RTL (decl)) == MEM
               && GET_CODE (XEXP (DECL_RTL (decl), 0)) == REG)
        {
          current_sym_code = N_LSYM;
          current_sym_value = DEBUGGER_AUTO_OFFSET (XEXP (DECL_RTL (decl), 0));
        }
      else if (GET_CODE (DECL_RTL (decl)) == MEM
               && GET_CODE (XEXP (DECL_RTL (decl), 0)) == PLUS
               && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 1)) == CONST_INT)
        {
          current_sym_code = N_LSYM;
          /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...)))
             We want the value of that CONST_INT.  */
          current_sym_value = DEBUGGER_AUTO_OFFSET (XEXP (DECL_RTL (decl), 0));
        }
      else
        /* Address might be a MEM, when DECL is a variable-sized object.
           Or it might be const0_rtx, meaning previous passes
           want us to ignore this variable.  */
        break;

      /* Ok, start a symtab entry and output the variable name.  */
      FORCE_TEXT;
      /* One slight hitch: if this is a VAR_DECL which is a static
         class member, we must put out the mangled name instead of the
         DECL_NAME.  */
      {
        char *name;
        /* Note also that static member (variable) names DO NOT begin
           with underscores in .stabs directives.  */
        if (DECL_LANG_SPECIFIC (decl))
          {
            name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));

            /* Adding 1 here only works on systems
               which flush an initial underscore.  */
            if (name[0] == '_')
              name += 1;
          }
        else
          name = IDENTIFIER_POINTER (DECL_NAME (decl));
        fprintf (asmfile, "%s \"%s:", ASM_STABS_OP, name);
      }
      if (letter) putc (letter, asmfile);
      dbxout_type (type, 0);
      dbxout_finish_symbol (decl);
      break;
    }
}

static void
dbxout_prepare_symbol (decl)
     tree decl;
{
#ifdef WINNING_GDB
  char *filename = DECL_SOURCE_FILE (decl);

  dbxout_source_file (asmfile, filename);
#endif
}

static void
dbxout_finish_symbol (sym)
     tree sym;
{
  int line = 0;
#ifdef WINNING_GDB
  if (sym != 0)
    line = DECL_SOURCE_LINE (sym);
#endif
  fprintf (asmfile, "\",%d,0,%d,", current_sym_code, line);
  if (current_sym_addr)
    output_addr_const (asmfile, current_sym_addr);
  else
    fprintf (asmfile, "%d", current_sym_value);
  putc ('\n', asmfile);
}

/* Output definitions of all the decls in a chain.  */

static void
dbxout_syms (syms)
     tree syms;
{
  while (syms)
    {
      dbxout_symbol (syms, 1);
      syms = TREE_CHAIN (syms);
    }
}
\f
/* The following two functions output definitions of function parameters.
   Each parameter gets a definition locating it in the parameter list.
   Each parameter that is a register variable gets a second definition
   locating it in the register.

   Printing or argument lists in gdb uses the definitions that
   locate in the parameter list.  But reference to the variable in
   expressions uses preferentially the definition as a register.  */

/* Output definitions, referring to storage in the parmlist,
   of all the parms in PARMS, which is a chain of PARM_DECL nodes.  */

static void
dbxout_parms (parms)
     tree parms;
{
  for (; parms; parms = TREE_CHAIN (parms))
    if (DECL_NAME (parms) && TREE_TYPE (parms) != error_mark_node)
      {
        dbxout_prepare_symbol (parms);

        /* Perform any necessary register eliminations on the parameter's rtl,
           so that the debugging output will be accurate.  */
        DECL_INCOMING_RTL (parms)
          = eliminate_regs (DECL_INCOMING_RTL (parms), 0, 0);
        DECL_RTL (parms) = eliminate_regs (DECL_RTL (parms), 0, 0);
#ifdef LEAF_REG_REMAP
        if (leaf_function)
          {
            leaf_renumber_regs_insn (DECL_INCOMING_RTL (parms));
            leaf_renumber_regs_insn (DECL_RTL (parms));
          }
#endif

        if (PARM_PASSED_IN_MEMORY (parms))
          {
            rtx addr = XEXP (DECL_INCOMING_RTL (parms), 0);

            /* ??? Here we assume that the parm address is indexed
               off the frame pointer or arg pointer.
               If that is not true, we produce meaningless results,
               but do not crash.  */
            if (GET_CODE (addr) == PLUS
                && GET_CODE (XEXP (addr, 1)) == CONST_INT)
              current_sym_value = INTVAL (XEXP (addr, 1));
            else
              current_sym_value = 0;

            current_sym_code = N_PSYM;
            current_sym_addr = 0;

            FORCE_TEXT;
            if (DECL_NAME (parms))
              {
                current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (parms));

                fprintf (asmfile, "%s \"%s:p", ASM_STABS_OP,
                         IDENTIFIER_POINTER (DECL_NAME (parms)));
              }
            else
              {
                current_sym_nchars = 8;
                fprintf (asmfile, "%s \"(anon):p", ASM_STABS_OP);
              }

            if (GET_CODE (DECL_RTL (parms)) == REG
                && REGNO (DECL_RTL (parms)) >= 0
                && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
              dbxout_type (DECL_ARG_TYPE (parms), 0);
            else
              {
                int original_value = current_sym_value;

                /* This is the case where the parm is passed as an int or double
                   and it is converted to a char, short or float and stored back
                   in the parmlist.  In this case, describe the parm
                   with the variable's declared type, and adjust the address
                   if the least significant bytes (which we are using) are not
                   the first ones.  */
#if BYTES_BIG_ENDIAN
                if (TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
                  current_sym_value += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
                                        - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
#endif

                if (GET_CODE (DECL_RTL (parms)) == MEM
                    && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
                    && GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == CONST_INT
                    && INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == current_sym_value)
                  dbxout_type (TREE_TYPE (parms), 0);
                else
                  {
                    current_sym_value = original_value;
                    dbxout_type (DECL_ARG_TYPE (parms), 0);
                  }
              }
            current_sym_value = DEBUGGER_ARG_OFFSET (current_sym_value, addr);
            dbxout_finish_symbol (parms);
          }
        else if (GET_CODE (DECL_RTL (parms)) == REG)
          {
            rtx best_rtl;
            /* Parm passed in registers and lives in registers or nowhere.  */

            current_sym_code = N_RSYM;
            current_sym_addr = 0;

            /* If parm lives in a register, use that register;
               pretend the parm was passed there.  It would be more consistent
               to describe the register where the parm was passed,
               but in practice that register usually holds something else.  */
            if (REGNO (DECL_RTL (parms)) >= 0
                && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
              best_rtl = DECL_RTL (parms);
            /* If the parm lives nowhere,
               use the register where it was passed.  */
            else
              best_rtl = DECL_INCOMING_RTL (parms);
            current_sym_value = DBX_REGISTER_NUMBER (REGNO (best_rtl));

            FORCE_TEXT;
            if (DECL_NAME (parms))
              {
                current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (parms));
                fprintf (asmfile, "%s \"%s:P", ASM_STABS_OP,
                         IDENTIFIER_POINTER (DECL_NAME (parms)));
              }
            else
              {
                current_sym_nchars = 8;
                fprintf (asmfile, "%s \"(anon):P", ASM_STABS_OP);
              }

            dbxout_type (DECL_ARG_TYPE (parms), 0);
            dbxout_finish_symbol (parms);
          }
        else if (GET_CODE (DECL_RTL (parms)) == MEM
                 && XEXP (DECL_RTL (parms), 0) != const0_rtx)
          {
            /* Parm was passed in registers but lives on the stack.  */

            current_sym_code = N_PSYM;
            /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))),
               in which case we want the value of that CONST_INT,
               or (MEM (REG ...)) or (MEM (MEM ...)),
               in which case we use a value of zero.  */
            if (GET_CODE (XEXP (DECL_RTL (parms), 0)) == REG
                || GET_CODE (XEXP (DECL_RTL (parms), 0)) == MEM)
              current_sym_value = 0;
            else
              current_sym_value = INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1));
            current_sym_addr = 0;

            FORCE_TEXT;
            if (DECL_NAME (parms))
              {
                current_sym_nchars = 2 + strlen (IDENTIFIER_POINTER (DECL_NAME (parms)));

                fprintf (asmfile, "%s \"%s:p", ASM_STABS_OP,
                         IDENTIFIER_POINTER (DECL_NAME (parms)));
              }
            else
              {
                current_sym_nchars = 8;
                fprintf (asmfile, "%s \"(anon):p", ASM_STABS_OP);
              }

            current_sym_value
              = DEBUGGER_ARG_OFFSET (current_sym_value,
                                     XEXP (DECL_RTL (parms), 0));
            dbxout_type (TREE_TYPE (parms), 0);
            dbxout_finish_symbol (parms);
          }
      }
}

/* Output definitions for the places where parms live during the function,
   when different from where they were passed, when the parms were passed
   in memory.

   It is not useful to do this for parms passed in registers
   that live during the function in different registers, because it is
   impossible to look in the passed register for the passed value,
   so we use the within-the-function register to begin with.

   PARMS is a chain of PARM_DECL nodes.  */

static void
dbxout_reg_parms (parms)
     tree parms;
{
  for (; parms; parms = TREE_CHAIN (parms))
    if (DECL_NAME (parms))
      {
        dbxout_prepare_symbol (parms);

        /* Report parms that live in registers during the function
           but were passed in memory.  */
        if (GET_CODE (DECL_RTL (parms)) == REG
            && REGNO (DECL_RTL (parms)) >= 0
            && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER
            && PARM_PASSED_IN_MEMORY (parms))
          {
            current_sym_code = N_RSYM;
            current_sym_value = DBX_REGISTER_NUMBER (REGNO (DECL_RTL (parms)));
            current_sym_addr = 0;

            FORCE_TEXT;
            if (DECL_NAME (parms))
              {
                current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (parms));
                fprintf (asmfile, "%s \"%s:r", ASM_STABS_OP,
                         IDENTIFIER_POINTER (DECL_NAME (parms)));
              }
            else
              {
                current_sym_nchars = 8;
                fprintf (asmfile, "%s \"(anon):r", ASM_STABS_OP);
              }
            dbxout_type (TREE_TYPE (parms), 0);
            dbxout_finish_symbol (parms);
          }
        /* Report parms that live in memory but not where they were passed.  */
        else if (GET_CODE (DECL_RTL (parms)) == MEM
                 && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
                 && GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == CONST_INT
                 && PARM_PASSED_IN_MEMORY (parms)
                 && ! rtx_equal_p (DECL_RTL (parms), DECL_INCOMING_RTL (parms)))
          {
#if 0 /* ??? It is not clear yet what should replace this.  */
            int offset = DECL_OFFSET (parms) / BITS_PER_UNIT;
            /* A parm declared char is really passed as an int,
               so it occupies the least significant bytes.
               On a big-endian machine those are not the low-numbered ones.  */
#if BYTES_BIG_ENDIAN
            if (offset != -1 && TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
              offset += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
                         - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
#endif
            if (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) != offset) {...}
#endif
            current_sym_code = N_LSYM;
            current_sym_value = DEBUGGER_AUTO_OFFSET (XEXP (DECL_RTL (parms), 0));
            current_sym_addr = 0;
            FORCE_TEXT;
            if (DECL_NAME (parms))
              {
                current_sym_nchars = 2 + IDENTIFIER_LENGTH (DECL_NAME (parms));
                fprintf (asmfile, "%s \"%s:", ASM_STABS_OP,
                         IDENTIFIER_POINTER (DECL_NAME (parms)));
              }
            else
              {
                current_sym_nchars = 8;
                fprintf (asmfile, "%s \"(anon):", ASM_STABS_OP);
              }
            dbxout_type (TREE_TYPE (parms), 0);
            dbxout_finish_symbol (parms);
          }
      }
}
\f
/* Given a chain of ..._TYPE nodes (as come in a parameter list),
   output definitions of those names, in raw form */

void
dbxout_args (args)
     tree args;
{
  while (args)
    {
      putc (',', asmfile);
      dbxout_type (TREE_VALUE (args), 0);
      CHARS (1);
      args = TREE_CHAIN (args);
    }
}
\f
/* Given a chain of ..._TYPE nodes,
   find those which have typedef names and output those names.
   This is to ensure those types get output.  */

void
dbxout_types (types)
     register tree types;
{
  while (types)
    {
      if (TYPE_NAME (types)
          && TREE_CODE (TYPE_NAME (types)) == TYPE_DECL
          && ! TREE_ASM_WRITTEN (TYPE_NAME (types)))
        dbxout_symbol (TYPE_NAME (types), 1);
      types = TREE_CHAIN (types);
    }
}
\f
/* Output everything about a symbol block (a BLOCK node
   that represents a scope level),
   including recursive output of contained blocks.

   BLOCK is the BLOCK node.
   DEPTH is its depth within containing symbol blocks.
   ARGS is usually zero; but for the outermost block of the
   body of a function, it is a chain of PARM_DECLs for the function parameters.
   We output definitions of all the register parms
   as if they were local variables of that block.

   If -g1 was used, we count blocks just the same, but output nothing
   except for the outermost block.

   Actually, BLOCK may be several blocks chained together.
   We handle them all in sequence.  */

static void
dbxout_block (block, depth, args)
     register tree block;
     int depth;
     tree args;
{
  int blocknum;

  while (block)
    {
      /* Ignore blocks never expanded or otherwise marked as real.  */
      if (TREE_USED (block))
        {
#ifndef DBX_LBRAC_FIRST
          /* In dbx format, the syms of a block come before the N_LBRAC.  */
          if (debug_info_level != DINFO_LEVEL_TERSE || depth == 0)
            dbxout_syms (BLOCK_VARS (block));
          if (args)
            dbxout_reg_parms (args);
#endif

          /* Now output an N_LBRAC symbol to represent the beginning of
             the block.  Use the block's tree-walk order to generate
             the assembler symbols LBBn and LBEn
             that final will define around the code in this block.  */
          if (depth > 0 && debug_info_level != DINFO_LEVEL_TERSE)
            {
              char buf[20];
              blocknum = next_block_number++;
              ASM_GENERATE_INTERNAL_LABEL (buf, "LBB", blocknum);

              if (BLOCK_HANDLER_BLOCK (block))
                {
                  /* A catch block.  Must precede N_LBRAC.  */
                  tree decl = BLOCK_VARS (block);
                  while (decl)
                    {
#ifdef DBX_OUTPUT_CATCH
                      DBX_OUTPUT_CATCH (asmfile, decl, buf);
#else
                      fprintf (asmfile, "%s \"%s:C1\",%d,0,0,",
                               ASM_STABS_OP,
                               IDENTIFIER_POINTER (DECL_NAME (decl)), N_CATCH);
                      assemble_name (asmfile, buf);
                      fprintf (asmfile, "\n");
#endif
                      decl = TREE_CHAIN (decl);
                    }
                }

              fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC);
              assemble_name (asmfile, buf);
              fprintf (asmfile, "\n");
            }
          else if (depth > 0)
            /* Count blocks the same way regardless of debug_info_level.  */
            next_block_number++;

#ifdef DBX_LBRAC_FIRST
          /* On some weird machines, the syms of a block
             come after the N_LBRAC.  */
          if (debug_info_level != DINFO_LEVEL_TERSE || depth == 0)
            dbxout_syms (BLOCK_VARS (block));
          if (args)
            dbxout_reg_parms (args);
#endif

          /* Output the subblocks.  */
          dbxout_block (BLOCK_SUBBLOCKS (block), depth + 1, 0);

          /* Refer to the marker for the end of the block.  */
          if (depth > 0 && debug_info_level != DINFO_LEVEL_TERSE)
            {
              char buf[20];
              ASM_GENERATE_INTERNAL_LABEL (buf, "LBE", blocknum);
              fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC);
              assemble_name (asmfile, buf);
              fprintf (asmfile, "\n");
            }
        }
      block = BLOCK_CHAIN (block);
    }
}

/* Output the information about a function and its arguments and result.
   Usually this follows the function's code,
   but on some systems, it comes before.  */

static void
dbxout_really_begin_function (decl)
     tree decl;
{
  dbxout_symbol (decl, 0);
  dbxout_parms (DECL_ARGUMENTS (decl));
  if (DECL_NAME (DECL_RESULT (decl)) != 0)
    dbxout_symbol (DECL_RESULT (decl), 1);
}

/* Called at beginning of output of function definition.  */

void
dbxout_begin_function (decl)
     tree decl;
{
#ifdef DBX_FUNCTION_FIRST
  dbxout_really_begin_function (decl);
#endif
}

/* Output dbx data for a function definition.
   This includes a definition of the function name itself (a symbol),
   definitions of the parameters (locating them in the parameter list)
   and then output the block that makes up the function's body
   (including all the auto variables of the function).  */

void
dbxout_function (decl)
     tree decl;
{
#ifndef DBX_FUNCTION_FIRST
  dbxout_really_begin_function (decl);
#endif
  dbxout_block (DECL_INITIAL (decl), 0, DECL_ARGUMENTS (decl));
#ifdef DBX_OUTPUT_FUNCTION_END
  DBX_OUTPUT_FUNCTION_END (asmfile, decl);
#endif
}
\f
#else /* not DBX_DEBUGGING_INFO */

void
dbxout_init (asm_file, input_file_name)
     FILE *asm_file;
     char *input_file_name;
{}

void
dbxout_symbol (decl, local)
     tree decl;
     int local;
{}

void
dbxout_types (types)
     register tree types;
{}

void
dbxout_function (decl)
     tree decl;
{}

#endif /* DBX_DEBUGGING_INFO */