* dbxout.c (dbxout_begin_prologue): New function.

[pf3gnuchains/gcc-fork.git] / gcc / dbxout.c

/* Output dbx-format symbol table information from GNU compiler.
   Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.

This file is part of GCC.

GCC 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.

GCC 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 GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, 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 "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"

#include "tree.h"
#include "rtl.h"
#include "flags.h"
#include "regs.h"
#include "insn-config.h"
#include "reload.h"
#include "output.h" /* ASM_OUTPUT_SOURCE_LINE may refer to sdb functions.  */
#include "dbxout.h"
#include "toplev.h"
#include "tm_p.h"
#include "ggc.h"
#include "debug.h"
#include "function.h"
#include "target.h"
#include "langhooks.h"

#ifdef XCOFF_DEBUGGING_INFO
#include "xcoffout.h"
#endif

#undef DBXOUT_DECR_NESTING
#define DBXOUT_DECR_NESTING \
  if (--debug_nesting == 0 && symbol_queue_index > 0) \
    { emit_pending_bincls_if_required (); debug_flush_symbol_queue (); }

#undef DBXOUT_DECR_NESTING_AND_RETURN
#define DBXOUT_DECR_NESTING_AND_RETURN(x) \
  do {--debug_nesting; return (x);} while (0)

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

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

#ifndef DBX_TYPE_DECL_STABS_CODE
#define DBX_TYPE_DECL_STABS_CODE N_LSYM
#endif

#ifndef DBX_STATIC_CONST_VAR_CODE
#define DBX_STATIC_CONST_VAR_CODE N_FUN
#endif

#ifndef DBX_REGPARM_STABS_CODE
#define DBX_REGPARM_STABS_CODE N_RSYM
#endif

#ifndef DBX_REGPARM_STABS_LETTER
#define DBX_REGPARM_STABS_LETTER 'P'
#endif

/* This is used for parameters passed by invisible reference in a register.  */
#ifndef GDB_INV_REF_REGPARM_STABS_LETTER
#define GDB_INV_REF_REGPARM_STABS_LETTER 'a'
#endif

#ifndef DBX_MEMPARM_STABS_LETTER
#define DBX_MEMPARM_STABS_LETTER 'p'
#endif

#ifndef FILE_NAME_JOINER
#define FILE_NAME_JOINER "/"
#endif

/* GDB needs to know that the stabs were generated by GCC.  We emit an
   N_OPT stab at the beginning of the source file to indicate this.
   The string is historical, and different on a very few targets.  */
#ifndef STABS_GCC_MARKER
#define STABS_GCC_MARKER "gcc2_compiled."
#endif

enum typestatus {TYPE_UNSEEN, TYPE_XREF, TYPE_DEFINED};

/* Structure recording information about a C data type.
   The status element says whether we have yet output
   the definition of the type.  TYPE_XREF says we have
   output it as a cross-reference only.
   The file_number and type_number elements are used if DBX_USE_BINCL
   is defined.  */

struct typeinfo GTY(())
{
  enum typestatus status;
  int file_number;
  int type_number;
};

/* Vector recording information about 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.  */

static GTY ((length ("typevec_len"))) struct typeinfo *typevec;

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

static GTY(()) 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 GTY(()) int next_type_number;

/* The C front end may call dbxout_symbol before dbxout_init runs.
   We save all such decls in this list and output them when we get
   to dbxout_init.  */

static GTY(()) tree preinit_symbols;

enum binclstatus {BINCL_NOT_REQUIRED, BINCL_PENDING, BINCL_PROCESSED};

/* When using N_BINCL in dbx output, each type number is actually a
   pair of the file number and the type number within the file.
   This is a stack of input files.  */

struct dbx_file
{
  struct dbx_file *next;
  int file_number;
  int next_type_number;
  enum binclstatus bincl_status;  /* Keep track of lazy bincl.  */
  const char *pending_bincl_name; /* Name of bincl.  */
  struct dbx_file *prev;          /* Chain to traverse all pending bincls.  */
};

/* This is the top of the stack.  
   
   This is not saved for PCH, because restoring a PCH should not change it.
   next_file_number does have to be saved, because the PCH may use some
   file numbers; however, just before restoring a PCH, next_file_number
   should always be 0 because we should not have needed any file numbers
   yet.  */

#if (defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)) \
    && defined (DBX_USE_BINCL)
static struct dbx_file *current_file;
#endif

/* This is the next file number to use.  */

static GTY(()) int next_file_number;

/* A counter for dbxout_function_end.  */

static GTY(()) int scope_labelno;

/* A counter for dbxout_source_line.  */

static GTY(()) int dbxout_source_line_counter;

/* 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 GTY(()) int have_used_extensions = 0;

/* Number for the next N_SOL filename stabs label.  The number 0 is reserved
   for the N_SO filename stabs label.  */

static GTY(()) int source_label_number = 1;

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

static GTY(()) const char *lastfile;

/* Used by PCH machinery to detect if 'lastfile' should be reset to
   base_input_file.  */
static GTY(()) int lastfile_is_base;

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

#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)

#ifdef DBX_USE_BINCL
/* If zero then there is no pending BINCL.  */
static int pending_bincls = 0;
#endif

/* The original input file name.  */
static const char *base_input_file;

/* Current working directory.  */

static const char *cwd;

#ifdef DEBUG_SYMS_TEXT
#define FORCE_TEXT function_section (current_function_decl);
#else
#define FORCE_TEXT
#endif

#include "gstab.h"

#define STAB_CODE_TYPE enum __stab_debug_code

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

#define PARM_PASSED_IN_MEMORY(PARM) \
 (MEM_P (DECL_INCOMING_RTL (PARM)))

/* 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;

/* 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 do { } while (0)
#endif

#ifdef DBX_USE_BINCL
static void emit_bincl_stab             (const char *c);
static void emit_pending_bincls         (void);
#endif
static inline void emit_pending_bincls_if_required (void);

static void dbxout_init (const char *);
static void dbxout_finish (const char *);
static void dbxout_start_source_file (unsigned, const char *);
static void dbxout_end_source_file (unsigned);
static void dbxout_typedefs (tree);
static void dbxout_type_index (tree);
#if DBX_CONTIN_LENGTH > 0
static void dbxout_continue (void);
#endif
static void dbxout_args (tree);
static void dbxout_type_fields (tree);
static void dbxout_type_method_1 (tree, const char *);
static void dbxout_type_methods (tree);
static void dbxout_range_type (tree);
static void dbxout_type (tree, int);
static bool print_int_cst_bounds_in_octal_p (tree);
static void print_int_cst_octal (tree);
static void print_octal (unsigned HOST_WIDE_INT, int);
static void print_wide_int (HOST_WIDE_INT);
static void dbxout_type_name (tree);
static void dbxout_class_name_qualifiers (tree);
static int dbxout_symbol_location (tree, tree, const char *, rtx);
static void dbxout_symbol_name (tree, const char *, int);
static void dbxout_prepare_symbol (tree);
static void dbxout_finish_symbol (tree);
static void dbxout_block (tree, int, tree);
static void dbxout_global_decl (tree);
static void dbxout_type_decl (tree, int);
static void dbxout_handle_pch (unsigned);
\f
/* The debug hooks structure.  */
#if defined (DBX_DEBUGGING_INFO)

static void dbxout_source_line (unsigned int, const char *);
static void dbxout_begin_prologue (unsigned int, const char *);
static void dbxout_source_file (FILE *, const char *);
static void dbxout_function_end (void);
static void dbxout_begin_function (tree);
static void dbxout_begin_block (unsigned, unsigned);
static void dbxout_end_block (unsigned, unsigned);
static void dbxout_function_decl (tree);

const struct gcc_debug_hooks dbx_debug_hooks =
{
  dbxout_init,
  dbxout_finish,
  debug_nothing_int_charstar,
  debug_nothing_int_charstar,
  dbxout_start_source_file,
  dbxout_end_source_file,
  dbxout_begin_block,
  dbxout_end_block,
  debug_true_tree,                       /* ignore_block */
  dbxout_source_line,                    /* source_line */
  dbxout_begin_prologue,                 /* begin_prologue */
  debug_nothing_int_charstar,            /* end_prologue */
  debug_nothing_int_charstar,            /* end_epilogue */
#ifdef DBX_FUNCTION_FIRST
  dbxout_begin_function,
#else
  debug_nothing_tree,                    /* begin_function */
#endif
  debug_nothing_int,                     /* end_function */
  dbxout_function_decl,
  dbxout_global_decl,                    /* global_decl */
  dbxout_type_decl,                      /* type_decl */
  debug_nothing_tree_tree,               /* imported_module_or_decl */
  debug_nothing_tree,                    /* deferred_inline_function */
  debug_nothing_tree,                    /* outlining_inline_function */
  debug_nothing_rtx,                     /* label */
  dbxout_handle_pch,                     /* handle_pch */
  debug_nothing_rtx                      /* var_location */
};
#endif /* DBX_DEBUGGING_INFO  */

#if defined (XCOFF_DEBUGGING_INFO)
const struct gcc_debug_hooks xcoff_debug_hooks =
{
  dbxout_init,
  dbxout_finish,
  debug_nothing_int_charstar,
  debug_nothing_int_charstar,
  dbxout_start_source_file,
  dbxout_end_source_file,
  xcoffout_begin_block,
  xcoffout_end_block,
  debug_true_tree,                       /* ignore_block */
  xcoffout_source_line,
  xcoffout_begin_prologue,               /* begin_prologue */
  debug_nothing_int_charstar,            /* end_prologue */
  xcoffout_end_epilogue,
  debug_nothing_tree,                    /* begin_function */
  xcoffout_end_function,
  debug_nothing_tree,                    /* function_decl */
  dbxout_global_decl,                    /* global_decl */
  dbxout_type_decl,                      /* type_decl */
  debug_nothing_tree_tree,               /* imported_module_or_decl */
  debug_nothing_tree,                    /* deferred_inline_function */
  debug_nothing_tree,                    /* outlining_inline_function */
  debug_nothing_rtx,                     /* label */
  dbxout_handle_pch,                     /* handle_pch */
  debug_nothing_rtx                      /* var_location */
};
#endif /* XCOFF_DEBUGGING_INFO  */
\f
#if defined (DBX_DEBUGGING_INFO)
static void
dbxout_function_end (void)
{
  char lscope_label_name[100];

  /* The Lscope label must be emitted even if we aren't doing anything
     else; dbxout_block needs it.  */
  function_section (current_function_decl);
  
  /* 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 (lscope_label_name, "Lscope", scope_labelno);
  targetm.asm_out.internal_label (asmfile, "Lscope", scope_labelno);
  scope_labelno++;

  /* The N_FUN tag at the end of the function is a GNU extension,
     which may be undesirable, and is unnecessary if we do not have
     named sections.  */
  if (!use_gnu_debug_info_extensions
#if defined(NO_DBX_FUNCTION_END)
      || NO_DBX_FUNCTION_END
#endif
      || !targetm.have_named_sections)
    return;

  /* By convention, GCC will mark the end of a function with an N_FUN
     symbol and an empty string.  */
#ifdef DBX_OUTPUT_NFUN
  DBX_OUTPUT_NFUN (asmfile, lscope_label_name, current_function_decl);
#else
  fprintf (asmfile, "%s\"\",%d,0,0,", ASM_STABS_OP, N_FUN);
  assemble_name (asmfile, lscope_label_name);
  putc ('-', asmfile);
  assemble_name (asmfile, XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));
  fprintf (asmfile, "\n");
#endif

  if (!flag_debug_only_used_symbols)
    fprintf (asmfile, "%s%d,0,0\n", ASM_STABD_OP, N_ENSYM);
}
#endif /* DBX_DEBUGGING_INFO */

/* At the beginning of compilation, start writing the symbol table.
   Initialize `typevec' and output the standard data types of C.  */

static void
dbxout_init (const char *input_file_name)
{
  char ltext_label_name[100];
  tree syms = lang_hooks.decls.getdecls ();

  asmfile = asm_out_file;

  typevec_len = 100;
  typevec = ggc_calloc (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.  */
  if (use_gnu_debug_info_extensions)
    {
      if (!cwd && (cwd = get_src_pwd ())
          && (!*cwd || cwd[strlen (cwd) - 1] != '/'))
        cwd = concat (cwd, FILE_NAME_JOINER, NULL);
      if (cwd)
        {
#ifdef DBX_OUTPUT_MAIN_SOURCE_DIRECTORY
          DBX_OUTPUT_MAIN_SOURCE_DIRECTORY (asmfile, cwd);
#else /* no DBX_OUTPUT_MAIN_SOURCE_DIRECTORY */
          fprintf (asmfile, "%s", ASM_STABS_OP);
          output_quoted_string (asmfile, cwd);
          fprintf (asmfile, ",%d,0,0,", N_SO);
          assemble_name (asmfile, ltext_label_name);
          fputc ('\n', asmfile);
#endif /* no DBX_OUTPUT_MAIN_SOURCE_DIRECTORY */
        }
    }

#ifdef DBX_OUTPUT_MAIN_SOURCE_FILENAME
  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", ASM_STABS_OP);
  output_quoted_string (asmfile, input_file_name);
  fprintf (asmfile, ",%d,0,0,", N_SO);
  assemble_name (asmfile, ltext_label_name);
  fputc ('\n', asmfile);
  text_section ();
  targetm.asm_out.internal_label (asmfile, "Ltext", 0);
#endif /* no DBX_OUTPUT_MAIN_SOURCE_FILENAME */

#ifdef DBX_OUTPUT_GCC_MARKER
  DBX_OUTPUT_GCC_MARKER (asmfile);
#else
  /* Emit an N_OPT stab to indicate that this file was compiled by GCC.  */
  fprintf (asmfile, "%s\"%s\",%d,0,0,0\n",
           ASM_STABS_OP, STABS_GCC_MARKER, N_OPT);
#endif

  base_input_file = lastfile = input_file_name;

  next_type_number = 1;

#ifdef DBX_USE_BINCL
  current_file = xmalloc (sizeof *current_file);
  current_file->next = NULL;
  current_file->file_number = 0;
  current_file->next_type_number = 1;
  next_file_number = 1;
  current_file->prev = NULL;
  current_file->bincl_status = BINCL_NOT_REQUIRED;
  current_file->pending_bincl_name = NULL;
#endif

  /* Get all permanent types that have typedef names, and output them
     all, except for those already output.  Some language front ends
     put these declarations in the top-level scope; some do not;
     the latter are responsible for calling debug_hooks->type_decl from
     their record_builtin_type function.  */
  dbxout_typedefs (syms);

  if (preinit_symbols)
    {
      tree t;
      for (t = nreverse (preinit_symbols); t; t = TREE_CHAIN (t))
        dbxout_symbol (TREE_VALUE (t), 0);
      preinit_symbols = 0;
    }
}

/* Output any typedef names for types described by TYPE_DECLs in SYMS.  */

static void
dbxout_typedefs (tree syms)
{
  for (; syms != NULL_TREE; syms = 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
              && COMPLETE_OR_VOID_TYPE_P (type)
              && ! TREE_ASM_WRITTEN (TYPE_NAME (type)))
            dbxout_symbol (TYPE_NAME (type), 0);
        }
    }
}

#ifdef DBX_USE_BINCL
/* Emit BINCL stab using given name.  */
static void
emit_bincl_stab (const char *name)
{
  fprintf (asmfile, "%s", ASM_STABS_OP);
  output_quoted_string (asmfile, name);
  fprintf (asmfile, ",%d,0,0,0\n", N_BINCL);
}

/* If there are pending bincls then it is time to emit all of them.  */

static inline void
emit_pending_bincls_if_required (void)
{
  if (pending_bincls)
    emit_pending_bincls ();
}

/* Emit all pending bincls.  */

static void
emit_pending_bincls (void)
{
  struct dbx_file *f = current_file;

  /* Find first pending bincl.  */
  while (f->bincl_status == BINCL_PENDING)
    f = f->next;

  /* Now emit all bincls.  */
  f = f->prev;

  while (f)
    {
      if (f->bincl_status == BINCL_PENDING)
        {
          emit_bincl_stab (f->pending_bincl_name);

          /* Update file number and status.  */
          f->file_number = next_file_number++;
          f->bincl_status = BINCL_PROCESSED;
        }
      if (f == current_file)
        break;
      f = f->prev;
    }

  /* All pending bincls have been emitted.  */
  pending_bincls = 0;
}

#else

static inline void
emit_pending_bincls_if_required (void) {}
#endif

/* Change to reading from a new source file.  Generate a N_BINCL stab.  */

static void
dbxout_start_source_file (unsigned int line ATTRIBUTE_UNUSED,
                          const char *filename ATTRIBUTE_UNUSED)
{
#ifdef DBX_USE_BINCL
  struct dbx_file *n = xmalloc (sizeof *n);

  n->next = current_file;
  n->next_type_number = 1;
  /* Do not assign file number now. 
     Delay it until we actually emit BINCL.  */
  n->file_number = 0;
  n->prev = NULL;
  current_file->prev = n;
  n->bincl_status = BINCL_PENDING;
  n->pending_bincl_name = filename;
  pending_bincls = 1;
  current_file = n;
#endif
}

/* Revert to reading a previous source file.  Generate a N_EINCL stab.  */

static void
dbxout_end_source_file (unsigned int line ATTRIBUTE_UNUSED)
{
#ifdef DBX_USE_BINCL
  /* Emit EINCL stab only if BINCL is not pending.  */
  if (current_file->bincl_status == BINCL_PROCESSED)
    fprintf (asmfile, "%s%d,0,0,0\n", ASM_STABN_OP, N_EINCL);
  current_file->bincl_status = BINCL_NOT_REQUIRED;
  current_file = current_file->next;
#endif
}

/* Handle a few odd cases that occur when trying to make PCH files work.  */

static void
dbxout_handle_pch (unsigned at_end)
{
  if (! at_end)
    {
      /* When using the PCH, this file will be included, so we need to output
         a BINCL.  */
      dbxout_start_source_file (0, lastfile);

      /* The base file when using the PCH won't be the same as
         the base file when it's being generated.  */
      lastfile = NULL;
    }
  else
    {
      /* ... and an EINCL.  */
      dbxout_end_source_file (0);

      /* Deal with cases where 'lastfile' was never actually changed.  */
      lastfile_is_base = lastfile == NULL;
    }
}

#if defined (DBX_DEBUGGING_INFO)
/* Output debugging info to FILE to switch to sourcefile FILENAME.  */

static void
dbxout_source_file (FILE *file, const char *filename)
{
  if (lastfile == 0 && lastfile_is_base)
    {
      lastfile = base_input_file;
      lastfile_is_base = 0;
    }

  if (filename && (lastfile == 0 || strcmp (filename, lastfile)))
    {
      char ltext_label_name[100];

      ASM_GENERATE_INTERNAL_LABEL (ltext_label_name, "Ltext",
                                   source_label_number);
      fprintf (file, "%s", ASM_STABS_OP);
      output_quoted_string (file, filename);
      fprintf (asmfile, ",%d,0,0,", N_SOL);
      assemble_name (asmfile, ltext_label_name);
      fputc ('\n', asmfile);
      if (current_function_decl != NULL_TREE
          && DECL_SECTION_NAME (current_function_decl) != NULL_TREE)
        ; /* Don't change section amid function.  */
      else
        {
          if (!in_text_section () && !in_unlikely_text_section ())
            text_section ();
        }
      targetm.asm_out.internal_label (file, "Ltext", source_label_number);
      source_label_number++;
      lastfile = filename;
    }
}

/* Output N_BNSYM and line number symbol entry.  */

static void
dbxout_begin_prologue (unsigned int lineno, const char *filename)
{
  if (!flag_debug_only_used_symbols)
    fprintf (asmfile, "%s%d,0,0\n", ASM_STABD_OP, N_BNSYM);

  dbxout_source_line (lineno, filename);
}

/* Output a line number symbol entry for source file FILENAME and line
   number LINENO.  */

static void
dbxout_source_line (unsigned int lineno, const char *filename)
{
  dbxout_source_file (asmfile, filename);

#ifdef ASM_OUTPUT_SOURCE_LINE
  dbxout_source_line_counter += 1;
  ASM_OUTPUT_SOURCE_LINE (asmfile, lineno, dbxout_source_line_counter);
#else
  fprintf (asmfile, "%s%d,0,%d\n", ASM_STABD_OP, N_SLINE, lineno);
#endif
}

/* Describe the beginning of an internal block within a function.  */

static void
dbxout_begin_block (unsigned int line ATTRIBUTE_UNUSED, unsigned int n)
{
  emit_pending_bincls_if_required ();
  targetm.asm_out.internal_label (asmfile, "LBB", n);
}

/* Describe the end line-number of an internal block within a function.  */

static void
dbxout_end_block (unsigned int line ATTRIBUTE_UNUSED, unsigned int n)
{
  emit_pending_bincls_if_required ();
  targetm.asm_out.internal_label (asmfile, "LBE", n);
}

/* 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).  */

static void
dbxout_function_decl (tree decl)
{
  emit_pending_bincls_if_required ();
#ifndef DBX_FUNCTION_FIRST
  dbxout_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
  dbxout_function_end ();
}

#endif /* DBX_DEBUGGING_INFO  */

/* Debug information for a global DECL.  Called from toplev.c after
   compilation proper has finished.  */
static void
dbxout_global_decl (tree decl)
{
  if (TREE_CODE (decl) == VAR_DECL
      && ! DECL_EXTERNAL (decl)
      && DECL_RTL_SET_P (decl)) /* Not necessary?  */
    {
      int saved_tree_used = TREE_USED (decl);
      TREE_USED (decl) = 1;
      dbxout_symbol (decl, 0);
      TREE_USED (decl) = saved_tree_used;
    }
}

/* This is just a function-type adapter; dbxout_symbol does exactly
   what we want but returns an int.  */
static void
dbxout_type_decl (tree decl, int local)
{
  dbxout_symbol (decl, local);
}

/* 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.  */

static void
dbxout_finish (const char *filename ATTRIBUTE_UNUSED)
{
#ifdef DBX_OUTPUT_MAIN_SOURCE_FILE_END
  DBX_OUTPUT_MAIN_SOURCE_FILE_END (asmfile, filename);
#endif /* DBX_OUTPUT_MAIN_SOURCE_FILE_END */

  debug_free_queue ();
}

/* Output the index of a type.  */

static void
dbxout_type_index (tree type)
{
#ifndef DBX_USE_BINCL
  fprintf (asmfile, "%d", TYPE_SYMTAB_ADDRESS (type));
  CHARS (3);
#else
  struct typeinfo *t = &typevec[TYPE_SYMTAB_ADDRESS (type)];
  fprintf (asmfile, "(%d,%d)", t->file_number, t->type_number);
  CHARS (9);
#endif
}

#if DBX_CONTIN_LENGTH > 0
/* 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 (void)
{
  emit_pending_bincls_if_required ();
#ifdef DBX_CONTIN_CHAR
  fprintf (asmfile, "%c", DBX_CONTIN_CHAR);
#else
  fprintf (asmfile, "\\\\");
#endif
  dbxout_finish_symbol (NULL_TREE);
  fprintf (asmfile, "%s\"", ASM_STABS_OP);
  current_sym_nchars = 0;
}
#endif /* DBX_CONTIN_LENGTH > 0 */
\f
/* Subroutine 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 (tree type)
{
  tree tem;

  /* Output the name, type, position (in bits), size (in bits) of each
     field that we can support.  */
  for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem))
    {
      /* If one of the nodes is an error_mark or its type is then
         return early.  */
      if (tem == error_mark_node || TREE_TYPE (tem) == error_mark_node)
        return;

      /* Omit here local type decls until we know how to support them.  */
      if (TREE_CODE (tem) == TYPE_DECL
          /* Omit fields whose position or size are variable or too large to
             represent.  */
          || (TREE_CODE (tem) == FIELD_DECL
              && (! host_integerp (bit_position (tem), 0)
                  || ! DECL_SIZE (tem)
                  || ! host_integerp (DECL_SIZE (tem), 1)))
          /* Omit here the nameless fields that are used to skip bits.  */
           || DECL_IGNORED_P (tem))
        continue;

      else if (TREE_CODE (tem) != CONST_DECL)
        {
          /* Continue the line if necessary,
             but not before the first field.  */
          if (tem != TYPE_FIELDS (type))
            CONTIN;

          if (DECL_NAME (tem))
            {
              fprintf (asmfile, "%s:", IDENTIFIER_POINTER (DECL_NAME (tem)));
              CHARS (2 + IDENTIFIER_LENGTH (DECL_NAME (tem)));
            }
          else
            {
              fprintf (asmfile, ":");
              CHARS (1);
            }

          if (use_gnu_debug_info_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_gnu_debug_info_extensions)
                {
                  tree name = DECL_ASSEMBLER_NAME (tem);

                  have_used_extensions = 1;
                  fprintf (asmfile, ":%s;", IDENTIFIER_POINTER (name));
                  CHARS (IDENTIFIER_LENGTH (name) + 2);
                }
              else
                {
                  /* If TEM is non-static, GDB won't understand it.  */
                  fprintf (asmfile, ",0,0;");
                  CHARS (5);
                }
            }
          else
            {
              putc (',', asmfile);
              print_wide_int (int_bit_position (tem));
              putc (',', asmfile);
              print_wide_int (tree_low_cst (DECL_SIZE (tem), 1));
              putc (';', asmfile);
              CHARS (3);
            }
        }
    }
}
\f
/* Subroutine 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 (tree decl, const char *debug_name)
{
  char c1 = 'A', c2;

  if (TREE_CODE (TREE_TYPE (decl)) == FUNCTION_TYPE)
    c2 = '?';
  else /* it's a METHOD_TYPE.  */
    {
      tree firstarg = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)));
      /* 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) && host_integerp (DECL_VINDEX (decl), 0))
    {
      print_wide_int (tree_low_cst (DECL_VINDEX (decl), 0));
      putc (';', asmfile);
      CHARS (1);
      dbxout_type (DECL_CONTEXT (decl), 0);
      fprintf (asmfile, ";");
      CHARS (1);
    }
}
\f
/* Subroutine of `dbxout_type'.  Output debug info about the methods defined
   in TYPE.  */

static void
dbxout_type_methods (tree type)
{
  /* C++: put out the method names and their parameter lists */
  tree methods = TYPE_METHODS (type);
  tree type_encoding;
  tree fndecl;
  tree last;
  char formatted_type_identifier_length[16];
  int type_identifier_length;

  if (methods == NULL_TREE)
    return;

  type_encoding = DECL_NAME (TYPE_NAME (type));

#if 0
  /* C++: Template classes break some assumptions made by this code about
     the class names, constructor names, and encodings for assembler
     label names.  For now, disable output of dbx info for them.  */
  {
    const char *ptr = IDENTIFIER_POINTER (type_encoding);
    /* This should use index.  (mrs) */
    while (*ptr && *ptr != '<') ptr++;
    if (*ptr != 0)
      {
        static int warned;
        if (!warned)
            warned = 1;
        return;
      }
  }
#endif

  type_identifier_length = IDENTIFIER_LENGTH (type_encoding);

  sprintf (formatted_type_identifier_length, "%d", type_identifier_length);

  if (TREE_CODE (methods) != TREE_VEC)
    fndecl = methods;
  else if (TREE_VEC_ELT (methods, 0) != NULL_TREE)
    fndecl = TREE_VEC_ELT (methods, 0);
  else
    fndecl = TREE_VEC_ELT (methods, 1);

  while (fndecl)
    {
      int need_prefix = 1;

      /* Group together all the methods for the same operation.
         These differ in the types of the arguments.  */
      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 */
        {
          /* This is the "mangled" name of the method.
             It encodes the argument types.  */
          const char *debug_name;

          /* Skip methods that aren't FUNCTION_DECLs.  (In C++, these
             include TEMPLATE_DECLs.)  The debugger doesn't know what
             to do with such entities anyhow.  */
          if (TREE_CODE (fndecl) != FUNCTION_DECL)
            continue;

          debug_name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl));

          CONTIN;

          last = fndecl;

          /* Also ignore abstract methods; those are only interesting to
             the DWARF backends.  */
          if (DECL_IGNORED_P (fndecl) || DECL_ABSTRACT (fndecl))
            continue;

          /* Redundantly output the plain name, since that's what gdb
             expects.  */
          if (need_prefix)
            {
              tree name = DECL_NAME (fndecl);
              fprintf (asmfile, "%s::", IDENTIFIER_POINTER (name));
              CHARS (IDENTIFIER_LENGTH (name) + 2);
              need_prefix = 0;
            }

          dbxout_type (TREE_TYPE (fndecl), 0);

          dbxout_type_method_1 (fndecl, debug_name);
        }
      if (!need_prefix)
        {
          putc (';', asmfile);
          CHARS (1);
        }
    }
}

/* Emit a "range" type specification, which has the form:
   "r<index type>;<lower bound>;<upper bound>;".
   TYPE is an INTEGER_TYPE.  */

static void
dbxout_range_type (tree type)
{
  fprintf (asmfile, "r");
  if (TREE_TYPE (type))
    dbxout_type (TREE_TYPE (type), 0);
  else if (TREE_CODE (type) != INTEGER_TYPE)
    dbxout_type (type, 0); /* E.g. Pascal's ARRAY [BOOLEAN] of INTEGER */
  else
    {
      /* Traditionally, we made sure 'int' was type 1, and builtin types
         were defined to be sub-ranges of int.  Unfortunately, this
         does not allow us to distinguish true sub-ranges from integer
         types.  So, instead we define integer (non-sub-range) types as
         sub-ranges of themselves.  This matters for Chill.  If this isn't
         a subrange type, then we want to define it in terms of itself.
         However, in C, this may be an anonymous integer type, and we don't
         want to emit debug info referring to it.  Just calling
         dbxout_type_index won't work anyways, because the type hasn't been
         defined yet.  We make this work for both cases by checked to see
         whether this is a defined type, referring to it if it is, and using
         'int' otherwise.  */
      if (TYPE_SYMTAB_ADDRESS (type) != 0)
        dbxout_type_index (type);
      else
        dbxout_type_index (integer_type_node);
    }

  if (TYPE_MIN_VALUE (type) != 0
      && host_integerp (TYPE_MIN_VALUE (type), 0))
    {
      putc (';', asmfile);
      CHARS (1);
      if (print_int_cst_bounds_in_octal_p (type))
        print_int_cst_octal (TYPE_MIN_VALUE (type));
      else
        print_wide_int (tree_low_cst (TYPE_MIN_VALUE (type), 0));
    }
  else
    {
      fprintf (asmfile, ";0");
      CHARS (2);
    }

  if (TYPE_MAX_VALUE (type) != 0
      && host_integerp (TYPE_MAX_VALUE (type), 0))
    {
      putc (';', asmfile);
      CHARS (1);
      if (print_int_cst_bounds_in_octal_p (type))
        print_int_cst_octal (TYPE_MAX_VALUE (type));
      else
        print_wide_int (tree_low_cst (TYPE_MAX_VALUE (type), 0));
      putc (';', asmfile);
      CHARS (1);
    }
  else
    {
      fprintf (asmfile, ";-1;");
      CHARS (4);
    }
}
\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 (tree type, int full)
{
  tree tem;
  tree main_variant;
  static int anonymous_type_number = 0;

  if (TREE_CODE (type) == VECTOR_TYPE)
    /* The frontend feeds us a representation for the vector as a struct
       containing an array.  Pull out the array type.  */
    type = TREE_TYPE (TYPE_FIELDS (TYPE_DEBUG_REPRESENTATION_TYPE (type)));

  /* 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
    {
      if (TYPE_NAME (type)
          && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
          && TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (type)))
        full = 0;
    }

  /* Try to find the "main variant" with the same name.  */
  if (TYPE_NAME (type) && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
      && DECL_ORIGINAL_TYPE (TYPE_NAME (type)))
    main_variant = TREE_TYPE (TYPE_NAME (type));
  else
    main_variant = TYPE_MAIN_VARIANT (type);

  /* If we are not using extensions, stabs does not distinguish const and
     volatile, so there is no need to make them separate types.  */
  if (!use_gnu_debug_info_extensions)
    type = main_variant;

  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
            = ggc_realloc (typevec, (typevec_len * 2 * sizeof typevec[0]));
          memset (typevec + typevec_len, 0, typevec_len * sizeof typevec[0]);
          typevec_len *= 2;
        }

#ifdef DBX_USE_BINCL
      emit_pending_bincls_if_required ();
      typevec[TYPE_SYMTAB_ADDRESS (type)].file_number
        = current_file->file_number;
      typevec[TYPE_SYMTAB_ADDRESS (type)].type_number
        = current_file->next_type_number++;
#endif
    }

  if (flag_debug_only_used_symbols)
    {
      if ((TREE_CODE (type) == RECORD_TYPE
           || TREE_CODE (type) == UNION_TYPE
           || TREE_CODE (type) == QUAL_UNION_TYPE
           || TREE_CODE (type) == ENUMERAL_TYPE)
          && TYPE_STUB_DECL (type)
          && TREE_CODE_CLASS (TREE_CODE (TYPE_STUB_DECL (type))) == 'd'
          && ! DECL_IGNORED_P (TYPE_STUB_DECL (type)))
        debug_queue_symbol (TYPE_STUB_DECL (type));
      else if (TYPE_NAME (type)
               && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
        debug_queue_symbol (TYPE_NAME (type));
    }

  /* Output the number of this type, to refer to it.  */
  dbxout_type_index (type);

#ifdef DBX_TYPE_DEFINED
  if (DBX_TYPE_DEFINED (type))
    return;
#endif

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

  switch (typevec[TYPE_SYMTAB_ADDRESS (type)].status)
    {
    case TYPE_UNSEEN:
      break;
    case TYPE_XREF:
      /* If we have already had a cross reference,
         and either that's all we want or that's the best we could do,
         don't repeat the cross reference.
         Sun dbx crashes if we do.  */
      if (! full || !COMPLETE_TYPE_P (type)
          /* No way in DBX fmt to describe a variable size.  */
          || ! host_integerp (TYPE_SIZE (type), 1))
        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 we have already used GNU debug info extensions,
     then it is OK to output a cross reference.  This is necessary to get
     proper C++ debug output.  */
  if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
       || TREE_CODE (type) == QUAL_UNION_TYPE
       || TREE_CODE (type) == ENUMERAL_TYPE)
      && ! use_gnu_debug_info_extensions)
    /* We must use the same test here as we use twice below when deciding
       whether to emit a cross-reference.  */
    if ((TYPE_NAME (type) != 0
         && ! (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
               && DECL_IGNORED_P (TYPE_NAME (type)))
         && !full)
        || !COMPLETE_TYPE_P (type)
        /* No way in DBX fmt to describe a variable size.  */
        || ! host_integerp (TYPE_SIZE (type), 1))
      {
        typevec[TYPE_SYMTAB_ADDRESS (type)].status = 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)].status = TYPE_DEFINED;

  /* If this type is a variant of some other, hand off.  Types with
     different names are usefully distinguished.  We only distinguish
     cv-qualified types if we're using extensions.  */
  if (TYPE_READONLY (type) > TYPE_READONLY (main_variant))
    {
      putc ('k', asmfile);
      CHARS (1);
      dbxout_type (build_type_variant (type, 0, TYPE_VOLATILE (type)), 0);
      return;
    }
  else if (TYPE_VOLATILE (type) > TYPE_VOLATILE (main_variant))
    {
      putc ('B', asmfile);
      CHARS (1);
      dbxout_type (build_type_variant (type, TYPE_READONLY (type), 0), 0);
      return;
    }
  else if (main_variant != TYPE_MAIN_VARIANT (type))
    {
      if (flag_debug_only_used_symbols)
        {
          tree orig_type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));

          if ((TREE_CODE (orig_type) == RECORD_TYPE
               || TREE_CODE (orig_type) == UNION_TYPE
               || TREE_CODE (orig_type) == QUAL_UNION_TYPE
               || TREE_CODE (orig_type) == ENUMERAL_TYPE)
              && TYPE_STUB_DECL (orig_type)
              && ! DECL_IGNORED_P (TYPE_STUB_DECL (orig_type)))
            debug_queue_symbol (TYPE_STUB_DECL (orig_type));
        }
      /* 'type' is a typedef; output the type it refers to.  */
      dbxout_type (DECL_ORIGINAL_TYPE (TYPE_NAME (type)), 0);
      return;
    }
  /* else continue.  */

  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.  */
      dbxout_type_index (type);
      break;

    case INTEGER_TYPE:
      if (type == char_type_node && ! TYPE_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");
          CHARS (1);
          dbxout_type_index (type);
          fprintf (asmfile, ";0;127;");
          CHARS (7);
        }

      /* If this is a subtype of another integer type, always prefer to
         write it as a subtype.  */
      else if (TREE_TYPE (type) != 0
               && TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE)
        {
          /* If the size is non-standard, say what it is if we can use
             GDB extensions.  */

          if (use_gnu_debug_info_extensions
              && TYPE_PRECISION (type) != TYPE_PRECISION (integer_type_node))
            {
              have_used_extensions = 1;
              fprintf (asmfile, "@s%d;", TYPE_PRECISION (type));
              CHARS (5);
            }

          dbxout_range_type (type);
        }

      else
        {
          /* If the size is non-standard, say what it is if we can use
             GDB extensions.  */

          if (use_gnu_debug_info_extensions
              && TYPE_PRECISION (type) != TYPE_PRECISION (integer_type_node))
            {
              have_used_extensions = 1;
              fprintf (asmfile, "@s%d;", TYPE_PRECISION (type));
              CHARS (5);
            }

          if (print_int_cst_bounds_in_octal_p (type))
            {
              fprintf (asmfile, "r");
              CHARS (1);

              /* If this type derives from another type, output type index of
                 parent type. This is particularly important when parent type
                 is an enumerated type, because not generating the parent type
                 index would transform the definition of this enumerated type
                 into a plain unsigned type.  */
              if (TREE_TYPE (type) != 0)
                dbxout_type_index (TREE_TYPE (type));
              else
                dbxout_type_index (type);

              fprintf (asmfile, ";");
              CHARS (1);
              print_int_cst_octal (TYPE_MIN_VALUE (type));
              fprintf (asmfile, ";");
              CHARS (1);
              print_int_cst_octal (TYPE_MAX_VALUE (type));
              fprintf (asmfile, ";");
              CHARS (1);
            }

          else
            /* Output other integer types as subranges of `int'.  */
            dbxout_range_type (type);
        }

      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");
      CHARS (1);
      dbxout_type_index (integer_type_node);
      putc (';', asmfile);
      CHARS (1);
      print_wide_int (int_size_in_bytes (type));
      fputs (";0;", asmfile);
      CHARS (3);
      break;

    case CHAR_TYPE:
      if (use_gnu_debug_info_extensions)
        {
          have_used_extensions = 1;
          fputs ("@s", asmfile);
          CHARS (2);
          print_wide_int (BITS_PER_UNIT * int_size_in_bytes (type));
          fputs (";-20;", asmfile);
          CHARS (4);
        }
      else
        {
          /* Output the type `char' as a subrange of itself.
             That is what pcc seems to do.  */
          fprintf (asmfile, "r");
          CHARS (1);
          dbxout_type_index (char_type_node);
          fprintf (asmfile, ";0;%d;", TYPE_UNSIGNED (type) ? 255 : 127);
          CHARS (7);
        }
      break;

    case BOOLEAN_TYPE:
      if (use_gnu_debug_info_extensions)
        {
          have_used_extensions = 1;
          fputs ("@s", asmfile);
          CHARS (2);
          print_wide_int (BITS_PER_UNIT * int_size_in_bytes (type));
          fputs (";-16;", asmfile);
          CHARS (4);
        }
      else /* Define as enumeral type (False, True) */
        {
          fprintf (asmfile, "eFalse:0,True:1,;");
          CHARS (17);
        }
      break;

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

    case COMPLEX_TYPE:
      /* Differs from the REAL_TYPE by its new data type number.
         R3 is NF_COMPLEX.  We don't try to use any of the other NF_*
         codes since gdb doesn't care anyway.  */

      if (TREE_CODE (TREE_TYPE (type)) == REAL_TYPE)
        {
          fputs ("R3;", asmfile);
          CHARS (3);
          print_wide_int (2 * int_size_in_bytes (TREE_TYPE (type)));
          fputs (";0;", asmfile);
          CHARS (3);
        }
      else
        {
          /* Output a complex integer type as a structure,
             pending some other way to do it.  */
          putc ('s', asmfile);
          CHARS (1);
          print_wide_int (int_size_in_bytes (type));
          fprintf (asmfile, "real:");
          CHARS (5);

          dbxout_type (TREE_TYPE (type), 0);
          fprintf (asmfile, ",0,%d;", TYPE_PRECISION (TREE_TYPE (type)));
          CHARS (7);
          fprintf (asmfile, "imag:");
          CHARS (5);
          dbxout_type (TREE_TYPE (type), 0);
          fprintf (asmfile, ",%d,%d;;", TYPE_PRECISION (TREE_TYPE (type)),
                   TYPE_PRECISION (TREE_TYPE (type)));
          CHARS (10);
        }
      break;

    case SET_TYPE:
      if (use_gnu_debug_info_extensions)
        {
          have_used_extensions = 1;
          fputs ("@s", asmfile);
          CHARS (2);
          print_wide_int (BITS_PER_UNIT * int_size_in_bytes (type));
          putc (';', asmfile);
          CHARS (1);

          /* Check if a bitstring type, which in Chill is
             different from a [power]set.  */
          if (TYPE_STRING_FLAG (type))
            {
              fprintf (asmfile, "@S;");
              CHARS (3);
            }
        }
      putc ('S', asmfile);
      CHARS (1);
      dbxout_type (TYPE_DOMAIN (type), 0);
      break;

    case ARRAY_TYPE:
      /* Make arrays of packed bits look like bitstrings for chill.  */
      if (TYPE_PACKED (type) && use_gnu_debug_info_extensions)
        {
          have_used_extensions = 1;
          fputs ("@s", asmfile);
          CHARS (2);
          print_wide_int (BITS_PER_UNIT * int_size_in_bytes (type));
          fprintf (asmfile, ";@S;S");
          CHARS (5);
          dbxout_type (TYPE_DOMAIN (type), 0);
          break;
        }

      /* 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 a C array of type M and size N+1.  */
      /* Check if a character string type, which in Chill is
         different from an array of characters.  */
      if (TYPE_STRING_FLAG (type) && use_gnu_debug_info_extensions)
        {
          have_used_extensions = 1;
          fprintf (asmfile, "@S;");
          CHARS (3);
        }
      tem = TYPE_DOMAIN (type);
      if (tem == NULL)
        {
          fprintf (asmfile, "ar");
          CHARS (2);
          dbxout_type_index (integer_type_node);
          fprintf (asmfile, ";0;-1;");
          CHARS (6);
        }
      else
        {
          fprintf (asmfile, "a");
          CHARS (1);
          dbxout_range_type (tem);
        }

      dbxout_type (TREE_TYPE (type), 0);
      break;

    case RECORD_TYPE:
    case UNION_TYPE:
    case QUAL_UNION_TYPE:
      {
        tree binfo = TYPE_BINFO (type);

        /* Output a structure type.  We must use the same test here as we
           use in the DBX_NO_XREFS case above.  */
        if ((TYPE_NAME (type) != 0
             && ! (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
                   && DECL_IGNORED_P (TYPE_NAME (type)))
             && !full)
            || !COMPLETE_TYPE_P (type)
            /* No way in DBX fmt to describe a variable size.  */
            || ! host_integerp (TYPE_SIZE (type), 1))
          {
            /* 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.  */
            fputs ((TREE_CODE (type) == RECORD_TYPE) ? "xs" : "xu", asmfile);
            CHARS (2);
#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
            if (TYPE_NAME (type) != 0)
              dbxout_type_name (type);
            else
              {
                fprintf (asmfile, "$$%d", anonymous_type_number++);
                CHARS (5);
              }

            fprintf (asmfile, ":");
            CHARS (1);
            typevec[TYPE_SYMTAB_ADDRESS (type)].status = TYPE_XREF;
            break;
          }

        /* Identify record or union, and print its size.  */
        putc (((TREE_CODE (type) == RECORD_TYPE) ? 's' : 'u'), asmfile);
        CHARS (1);
        print_wide_int (int_size_in_bytes (type));

        if (binfo)
          {
            int i;
            tree child;
            VEC (tree) *accesses = BINFO_BASE_ACCESSES (binfo);
            
            if (use_gnu_debug_info_extensions)
              {
                if (BINFO_N_BASE_BINFOS (binfo))
                  {
                    have_used_extensions = 1;
                    fprintf (asmfile, "!%u,", BINFO_N_BASE_BINFOS (binfo));
                    CHARS (8);
                  }
              }
            for (i = 0; BINFO_BASE_ITERATE (binfo, i, child); i++)
              {
                tree access = (accesses ? VEC_index (tree, accesses, i)
                               : access_public_node);

                if (use_gnu_debug_info_extensions)
                  {
                    have_used_extensions = 1;
                    putc (BINFO_VIRTUAL_P (child) ? '1' : '0', asmfile);
                    putc (access == access_public_node ? '2' :
                          (access == access_protected_node ? '1' :'0'),
                          asmfile);
                    CHARS (2);
                    if (BINFO_VIRTUAL_P (child)
                        && strcmp (lang_hooks.name, "GNU C++") == 0)
                      /* For a virtual base, print the (negative)
                         offset within the vtable where we must look
                         to find the necessary adjustment.  */
                      print_wide_int
                        (tree_low_cst (BINFO_VPTR_FIELD (child), 0)
                         * BITS_PER_UNIT);
                    else
                      print_wide_int (tree_low_cst (BINFO_OFFSET (child), 0)
                                      * BITS_PER_UNIT);
                    putc (',', asmfile);
                    CHARS (1);
                    dbxout_type (BINFO_TYPE (child), 0);
                    putc (';', asmfile);
                    CHARS (1);
                  }
                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);
                    CHARS (1);
                    dbxout_type (BINFO_TYPE (child), full);
                    putc (',', asmfile);
                    CHARS (1);
                    print_wide_int (tree_low_cst (BINFO_OFFSET (child), 0)
                                    * BITS_PER_UNIT);
                    putc (',', asmfile);
                    CHARS (1);
                    print_wide_int
                      (tree_low_cst (TYPE_SIZE (BINFO_TYPE (child)), 0)
                       * BITS_PER_UNIT);
                    putc (';', asmfile);
                    CHARS (1);
                  }
              }
          }
      }

      /* Write out the field declarations.  */
      dbxout_type_fields (type);
      if (use_gnu_debug_info_extensions && TYPE_METHODS (type) != NULL_TREE)
        {
          have_used_extensions = 1;
          dbxout_type_methods (type);
        }

      putc (';', asmfile);
      CHARS (1);

      if (use_gnu_debug_info_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);
          CHARS (1);

          /* 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);
              CHARS (1);
              dbxout_type (DECL_FCONTEXT (TYPE_VFIELD (type)), 0);
            }

          putc (';', asmfile);
          CHARS (1);
        }
      break;

    case ENUMERAL_TYPE:
      /* We must use the same test here as we use in the DBX_NO_XREFS case
         above.  We simplify it a bit since an enum will never have a variable
         size.  */
      if ((TYPE_NAME (type) != 0
           && ! (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
                 && DECL_IGNORED_P (TYPE_NAME (type)))
           && !full)
          || !COMPLETE_TYPE_P (type))
        {
          fprintf (asmfile, "xe");
          CHARS (2);
          dbxout_type_name (type);
          typevec[TYPE_SYMTAB_ADDRESS (type)].status = TYPE_XREF;
          putc (':', asmfile);
          CHARS (1);
          return;
        }
      if (use_gnu_debug_info_extensions
          && TYPE_PRECISION (type) != TYPE_PRECISION (integer_type_node))
        {
          fprintf (asmfile, "@s%d;", TYPE_PRECISION (type));
          CHARS (5);
        }

      putc ('e', asmfile);
      CHARS (1);
      for (tem = TYPE_VALUES (type); tem; tem = TREE_CHAIN (tem))
        {
          fprintf (asmfile, "%s:", IDENTIFIER_POINTER (TREE_PURPOSE (tem)));
          CHARS (IDENTIFIER_LENGTH (TREE_PURPOSE (tem)) + 1);
          if (TREE_INT_CST_HIGH (TREE_VALUE (tem)) == 0)
            print_wide_int (TREE_INT_CST_LOW (TREE_VALUE (tem)));
          else if (TREE_INT_CST_HIGH (TREE_VALUE (tem)) == -1
                   && (HOST_WIDE_INT) TREE_INT_CST_LOW (TREE_VALUE (tem)) < 0)
            print_wide_int (TREE_INT_CST_LOW (TREE_VALUE (tem)));
          else
            print_int_cst_octal (TREE_VALUE (tem));

          putc (',', asmfile);
          CHARS (1);
          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_gnu_debug_info_extensions)
        {
          have_used_extensions = 1;
          putc ('#', asmfile);
          CHARS (1);

          /* Write the argument types out longhand.  */
          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_gnu_debug_info_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_gnu_debug_info_extensions)
        have_used_extensions = 1;
      putc (use_gnu_debug_info_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 ();
    }
}

/* Return nonzero if the given type represents an integer whose bounds
   should be printed in octal format.  */

static bool
print_int_cst_bounds_in_octal_p (tree type)
{
  /* If we can use GDB extensions and the size is wider than a long
     (the size used by GDB to read them) or we may have trouble writing
     the bounds the usual way, write them in octal.  Note the test is for
     the *target's* size of "long", not that of the host.  The host test
     is just to make sure we can write it out in case the host wide int
     is narrower than the target "long".

     For unsigned types, we use octal if they are the same size or larger.
     This is because we print the bounds as signed decimal, and hence they
     can't span same size unsigned types.  */

  if (use_gnu_debug_info_extensions
      && TYPE_MIN_VALUE (type) != 0
      && TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST
      && TYPE_MAX_VALUE (type) != 0
      && TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST
      && (TYPE_PRECISION (type) > TYPE_PRECISION (integer_type_node)
          || ((TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
              && TYPE_UNSIGNED (type))
          || TYPE_PRECISION (type) > HOST_BITS_PER_WIDE_INT
          || (TYPE_PRECISION (type) == HOST_BITS_PER_WIDE_INT
              && TYPE_UNSIGNED (type))))
    return TRUE;
  else
    return FALSE;
}

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

static void
print_int_cst_octal (tree c)
{
  unsigned HOST_WIDE_INT high = TREE_INT_CST_HIGH (c);
  unsigned HOST_WIDE_INT low = TREE_INT_CST_LOW (c);
  int excess = (3 - (HOST_BITS_PER_WIDE_INT % 3));
  unsigned int width = TYPE_PRECISION (TREE_TYPE (c));

  /* GDB wants constants with no extra leading "1" bits, so
     we need to remove any sign-extension that might be
     present.  */
  if (width == HOST_BITS_PER_WIDE_INT * 2)
    ;
  else if (width > HOST_BITS_PER_WIDE_INT)
    high &= (((HOST_WIDE_INT) 1 << (width - HOST_BITS_PER_WIDE_INT)) - 1);
  else if (width == HOST_BITS_PER_WIDE_INT)
    high = 0;
  else
    high = 0, low &= (((HOST_WIDE_INT) 1 << width) - 1);

  fprintf (asmfile, "0");
  CHARS (1);

  if (excess == 3)
    {
      print_octal (high, HOST_BITS_PER_WIDE_INT / 3);
      print_octal (low, HOST_BITS_PER_WIDE_INT / 3);
    }
  else
    {
      unsigned HOST_WIDE_INT beg = high >> excess;
      unsigned HOST_WIDE_INT middle
        = ((high & (((HOST_WIDE_INT) 1 << excess) - 1)) << (3 - excess)
           | (low >> (HOST_BITS_PER_WIDE_INT / 3 * 3)));
      unsigned HOST_WIDE_INT end
        = low & (((unsigned HOST_WIDE_INT) 1
                  << (HOST_BITS_PER_WIDE_INT / 3 * 3))
                 - 1);

      fprintf (asmfile, "%o%01o", (int) beg, (int) middle);
      CHARS (2);
      print_octal (end, HOST_BITS_PER_WIDE_INT / 3);
    }
}

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

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

  CHARS (digits);
}

/* Output C in decimal while adjusting the number of digits written.  */

static void
print_wide_int (HOST_WIDE_INT c)
{
  int digs = 0;

  fprintf (asmfile, HOST_WIDE_INT_PRINT_DEC, c);

  if (c < 0)
    digs++, c = -c;

  while (c > 0)
    c /= 10; digs++;

  CHARS (digs);
}

/* 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 (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));
}

/* Output leading leading struct or class names needed for qualifying
   type whose scope is limited to a struct or class.  */

static void
dbxout_class_name_qualifiers (tree decl)
{
  tree context = decl_type_context (decl);

  if (context != NULL_TREE
      && TREE_CODE(context) == RECORD_TYPE
      && TYPE_NAME (context) != 0
      && (TREE_CODE (TYPE_NAME (context)) == IDENTIFIER_NODE
          || (DECL_NAME (TYPE_NAME (context)) != 0)))
    {
      tree name = TYPE_NAME (context);

      emit_pending_bincls_if_required ();

      if (TREE_CODE (name) == TYPE_DECL)
        {
          dbxout_class_name_qualifiers (name);
          name = DECL_NAME (name);
        }
      fprintf (asmfile, "%s::", IDENTIFIER_POINTER (name));
      CHARS (IDENTIFIER_LENGTH (name) + 2);
    }
}
\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.
   Return 1 if a stabs might have been emitted.  */

int
dbxout_symbol (tree decl, int local ATTRIBUTE_UNUSED)
{
  tree type = TREE_TYPE (decl);
  tree context = NULL_TREE;
  int result = 0;

  /* "Intercept" dbxout_symbol() calls like we do all debug_hooks.  */
  ++debug_nesting;

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

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

  /* If we are to generate only the symbols actually used then such
     symbol nodees are flagged with TREE_USED.  Ignore any that
     aren't flaged as TREE_USED.  */

  if (flag_debug_only_used_symbols
      && (!TREE_USED (decl)
          && (TREE_CODE (decl) != VAR_DECL || !DECL_INITIAL (decl))))
    DBXOUT_DECR_NESTING_AND_RETURN (0);

  /* If dbxout_init has not yet run, queue this symbol for later.  */
  if (!typevec)
    {
      preinit_symbols = tree_cons (0, decl, preinit_symbols);
      DBXOUT_DECR_NESTING_AND_RETURN (0);
    }

  if (flag_debug_only_used_symbols)
    {
      tree t;

      /* We now have a used symbol.  We need to generate the info for
         the symbol's type in addition to the symbol itself.  These
         type symbols are queued to be generated after were done with
         the symbol itself (done because the symbol's info is generated
         with fprintf's, etc. as it determines what's needed).

         Note, because the TREE_TYPE(type) might be something like a
         pointer to a named type we need to look for the first name
         we see following the TREE_TYPE chain.  */

      t = type;
      while (POINTER_TYPE_P (t))
        t = TREE_TYPE (t);

      /* RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE, and ENUMERAL_TYPE
         need special treatment.  The TYPE_STUB_DECL field in these
         types generally represents the tag name type we want to
         output.  In addition there  could be a typedef type with
         a different name.  In that case we also want to output
         that.  */

      if ((TREE_CODE (t) == RECORD_TYPE
           || TREE_CODE (t) == UNION_TYPE
           || TREE_CODE (t) == QUAL_UNION_TYPE
           || TREE_CODE (t) == ENUMERAL_TYPE)
          && TYPE_STUB_DECL (t)
          && TYPE_STUB_DECL (t) != decl
          && TREE_CODE_CLASS (TREE_CODE (TYPE_STUB_DECL (t))) == 'd'
          && ! DECL_IGNORED_P (TYPE_STUB_DECL (t)))
        {
          debug_queue_symbol (TYPE_STUB_DECL (t));
          if (TYPE_NAME (t)
              && TYPE_NAME (t) != TYPE_STUB_DECL (t)
              && TYPE_NAME (t) != decl
              && TREE_CODE_CLASS (TREE_CODE (TYPE_NAME (t))) == 'd')
            debug_queue_symbol (TYPE_NAME (t));
        }
      else if (TYPE_NAME (t)
               && TYPE_NAME (t) != decl
               && TREE_CODE_CLASS (TREE_CODE (TYPE_NAME (t))) == 'd')
        debug_queue_symbol (TYPE_NAME (t));
    }

  emit_pending_bincls_if_required ();

  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)
        DBXOUT_DECR_NESTING_AND_RETURN (0);
      if (DECL_EXTERNAL (decl))
        break;
      /* Don't mention a nested function under its parent.  */
      context = decl_function_context (decl);
      if (context == current_function_decl)
        break;
      if (!MEM_P (DECL_RTL (decl))
          || 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');
      result = 1;

      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:
      /* Don't output the same typedef twice.
         And don't output what language-specific stuff doesn't want output.  */
      if (TREE_ASM_WRITTEN (decl) || TYPE_DECL_SUPPRESS_DEBUG (decl))
        DBXOUT_DECR_NESTING_AND_RETURN (0);

      /* Don't output typedefs for types with magic type numbers (XCOFF).  */
#ifdef DBX_ASSIGN_FUNDAMENTAL_TYPE_NUMBER
      {
        int fundamental_type_number =
          DBX_ASSIGN_FUNDAMENTAL_TYPE_NUMBER (decl);

        if (fundamental_type_number != 0)
          {
            TREE_ASM_WRITTEN (decl) = 1;
            TYPE_SYMTAB_ADDRESS (TREE_TYPE (decl)) = fundamental_type_number;
            DBXOUT_DECR_NESTING_AND_RETURN (0);
          }
      }
#endif
      FORCE_TEXT;
      result = 1;
      {
        int tag_needed = 1;
        int did_output = 0;

        if (DECL_NAME (decl))
          {
            /* Nonzero means we must output a tag as well as a typedef.  */
            tag_needed = 0;

            /* Handle the case of a C++ structure or union
               where the TYPE_NAME is a TYPE_DECL
               which gives both a typedef name and a tag.  */
            /* dbx requires the tag first and the typedef second.  */
            if ((TREE_CODE (type) == RECORD_TYPE
                 || TREE_CODE (type) == UNION_TYPE
                 || TREE_CODE (type) == QUAL_UNION_TYPE)
                && TYPE_NAME (type) == decl
                && !(use_gnu_debug_info_extensions && have_used_extensions)
                && !TREE_ASM_WRITTEN (TYPE_NAME (type))
                /* Distinguish the implicit typedefs of C++
                   from explicit ones that might be found in C.  */
                && DECL_ARTIFICIAL (decl)
                /* Do not generate a tag for incomplete records.  */
                && COMPLETE_TYPE_P (type)
                /* Do not generate a tag for records of variable size,
                   since this type can not be properly described in the
                   DBX format, and it confuses some tools such as objdump.  */
                && host_integerp (TYPE_SIZE (type), 1))
              {
                tree name = TYPE_NAME (type);
                if (TREE_CODE (name) == TYPE_DECL)
                  name = DECL_NAME (name);

                current_sym_code = DBX_TYPE_DECL_STABS_CODE;
                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 (NULL_TREE);
              }

            /* Output .stabs (or whatever) and leading double quote.  */
            fprintf (asmfile, "%s\"", ASM_STABS_OP);

            if (use_gnu_debug_info_extensions)
              {
                /* Output leading class/struct qualifiers.  */
                dbxout_class_name_qualifiers (decl);
              }

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

            /* Short cut way to output a tag also.  */
            if ((TREE_CODE (type) == RECORD_TYPE
                 || TREE_CODE (type) == UNION_TYPE
                 || TREE_CODE (type) == QUAL_UNION_TYPE)
                && TYPE_NAME (type) == decl
                /* Distinguish the implicit typedefs of C++
                   from explicit ones that might be found in C.  */
                && DECL_ARTIFICIAL (decl))
              {
                if (use_gnu_debug_info_extensions && have_used_extensions)
                  {
                    putc ('T', asmfile);
                    TREE_ASM_WRITTEN (TYPE_NAME (type)) = 1;
                  }
#if 0 /* Now we generate the tag for this case up above.  */
                else
                  tag_needed = 1;
#endif
              }

            putc ('t', asmfile);
            current_sym_code = DBX_TYPE_DECL_STABS_CODE;

            dbxout_type (type, 1);
            dbxout_finish_symbol (decl);
            did_output = 1;
          }

        /* Don't output a tag if this is an incomplete type.  This prevents
           the sun4 Sun OS 4.x dbx from crashing.  */

        if (tag_needed && TYPE_NAME (type) != 0
            && (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE
                || (DECL_NAME (TYPE_NAME (type)) != 0))
            && COMPLETE_TYPE_P (type)
            && !TREE_ASM_WRITTEN (TYPE_NAME (type)))
          {
            /* For a TYPE_DECL with no name, but the type has a name,
               output a tag.
               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 = DBX_TYPE_DECL_STABS_CODE;
            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 (NULL_TREE);
            did_output = 1;
          }

        /* If an enum type has no name, it cannot be referred to,
           but we must output it anyway, since the enumeration constants
           can be referred to.  */
        if (!did_output && TREE_CODE (type) == ENUMERAL_TYPE)
          {
            current_sym_code = DBX_TYPE_DECL_STABS_CODE;
            current_sym_value = 0;
            current_sym_addr = 0;
            current_sym_nchars = 2;

            /* Some debuggers fail when given NULL names, so give this a
               harmless name of ` '.  */
            fprintf (asmfile, "%s\" :T", ASM_STABS_OP);
            dbxout_type (type, 1);
            dbxout_finish_symbol (NULL_TREE);
          }

        /* 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_SET_P (decl))
        DBXOUT_DECR_NESTING_AND_RETURN (0);
      /* Don't mention a variable that is external.
         Let the file that defines it describe it.  */
      if (DECL_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
          && host_integerp (DECL_INITIAL (decl), 0)
          && ! TREE_ASM_WRITTEN (decl)
          && (DECL_CONTEXT (decl) == NULL_TREE
              || TREE_CODE (DECL_CONTEXT (decl)) == BLOCK))
        {
          if (TREE_PUBLIC (decl) == 0)
            {
              /* The sun4 assembler does not grok this.  */
              const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));

              if (TREE_CODE (TREE_TYPE (decl)) == INTEGER_TYPE
                  || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
                {
                  HOST_WIDE_INT ival = tree_low_cst (DECL_INITIAL (decl), 0);
                  fprintf (asmfile, "%s\"%s:c=i" HOST_WIDE_INT_PRINT_DEC
                           "\",0x%x,0,0,0\n",
                           ASM_STABS_OP, name, ival, N_LSYM);
                  DBXOUT_DECR_NESTING;
                  return 1;
                }
              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.  */
        }

      SET_DECL_RTL (decl, eliminate_regs (DECL_RTL (decl), 0, NULL_RTX));
#ifdef LEAF_REG_REMAP
      if (current_function_uses_only_leaf_regs)
        leaf_renumber_regs_insn (DECL_RTL (decl));
#endif

      result = dbxout_symbol_location (decl, type, 0, DECL_RTL (decl));
      break;

    default:
      break;
    }
  DBXOUT_DECR_NESTING;
  return result;
}
\f
/* Output the stab for DECL, a VAR_DECL, RESULT_DECL or PARM_DECL.
   Add SUFFIX to its name, if SUFFIX is not 0.
   Describe the variable as residing in HOME
   (usually HOME is DECL_RTL (DECL), but not always).
   Returns 1 if the stab was really emitted.  */

static int
dbxout_symbol_location (tree decl, tree type, const char *suffix, rtx home)
{
  int letter = 0;
  int regno = -1;

  emit_pending_bincls_if_required ();

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

     If the decl was from an inline function, then its rtl
     is not identically the rtl that was used in this
     particular compilation.  */
  if (GET_CODE (home) == SUBREG)
    {
      rtx value = home;

      while (GET_CODE (value) == SUBREG)
        value = SUBREG_REG (value);
      if (REG_P (value))
        {
          if (REGNO (value) >= FIRST_PSEUDO_REGISTER)
            return 0;
        }
      home = alter_subreg (&home);
    }
  if (REG_P (home))
    {
      regno = REGNO (home);
      if (regno >= FIRST_PSEUDO_REGISTER)
        return 0;
    }

  /* 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 (MEM_P (home)
      && GET_CODE (XEXP (home, 0)) == SYMBOL_REF)
    {
      if (TREE_PUBLIC (decl))
        {
          letter = 'G';
          current_sym_code = N_GSYM;
        }
      else
        {
          current_sym_addr = XEXP (home, 0);

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

          /* This should be the same condition as in assemble_variable, but
             we don't have access to dont_output_data here.  So, instead,
             we rely on the fact that error_mark_node initializers always
             end up in bss for C++ and never end up in bss for C.  */
          if (DECL_INITIAL (decl) == 0
              || (!strcmp (lang_hooks.name, "GNU C++")
                  && DECL_INITIAL (decl) == error_mark_node))
            current_sym_code = N_LCSYM;
          else if (DECL_IN_TEXT_SECTION (decl))
            /* This is not quite right, but it's the closest
               of all the codes that Unix defines.  */
            current_sym_code = DBX_STATIC_CONST_VAR_CODE;
          else
            {
              /* Some ports can transform a symbol ref into a label ref,
                 because the symbol ref is too far away and has to be
                 dumped into a constant pool.  Alternatively, the symbol
                 in the constant pool might be referenced by a different
                 symbol.  */
              if (GET_CODE (current_sym_addr) == SYMBOL_REF
                  && CONSTANT_POOL_ADDRESS_P (current_sym_addr))
                {
                  bool marked;
                  rtx tmp = get_pool_constant_mark (current_sym_addr, &marked);

                  if (GET_CODE (tmp) == SYMBOL_REF)
                    {
                      current_sym_addr = tmp;
                      if (CONSTANT_POOL_ADDRESS_P (current_sym_addr))
                        get_pool_constant_mark (current_sym_addr, &marked);
                      else
                        marked = true;
                    }
                  else if (GET_CODE (tmp) == LABEL_REF)
                    {
                      current_sym_addr = tmp;
                      marked = true;
                    }

                   /* If all references to the constant pool were optimized
                      out, we just ignore the symbol.  */
                  if (!marked)
                    return 0;
                }

              /* 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 (MEM_P (home)
           && (MEM_P (XEXP (home, 0))
               || (REG_P (XEXP (home, 0))
                   && REGNO (XEXP (home, 0)) != HARD_FRAME_POINTER_REGNUM
                   && REGNO (XEXP (home, 0)) != STACK_POINTER_REGNUM
#if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
                   && REGNO (XEXP (home, 0)) != ARG_POINTER_REGNUM
#endif
                   )))
    /* 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.  */
    {
      if (REG_P (XEXP (home, 0)))
        {
          letter = 'r';
          current_sym_code = N_RSYM;
          if (REGNO (XEXP (home, 0)) >= FIRST_PSEUDO_REGISTER)
            return 0;
          current_sym_value = DBX_REGISTER_NUMBER (REGNO (XEXP (home, 0)));
        }
      else
        {
          current_sym_code = N_LSYM;
          /* 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 (home, 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.  */
      /* Don't use REFERENCE_TYPE because dbx can't handle that.  */
      type = make_node (POINTER_TYPE);
      TREE_TYPE (type) = TREE_TYPE (decl);
    }
  else if (MEM_P (home)
           && REG_P (XEXP (home, 0)))
    {
      current_sym_code = N_LSYM;
      current_sym_value = DEBUGGER_AUTO_OFFSET (XEXP (home, 0));
    }
  else if (MEM_P (home)
           && GET_CODE (XEXP (home, 0)) == PLUS
           && GET_CODE (XEXP (XEXP (home, 0), 1)) == CONST_INT)
    {
      current_sym_code = N_LSYM;
      /* RTL looks like (MEM (PLUS (REG...) (CONST_INT...)))
         We want the value of that CONST_INT.  */
      current_sym_value = DEBUGGER_AUTO_OFFSET (XEXP (home, 0));
    }
  else if (MEM_P (home)
           && GET_CODE (XEXP (home, 0)) == CONST)
    {
      /* Handle an obscure case which can arise when optimizing and
         when there are few available registers.  (This is *always*
         the case for i386/i486 targets).  The RTL looks like
         (MEM (CONST ...)) even though this variable is a local `auto'
         or a local `register' variable.  In effect, what has happened
         is that the reload pass has seen that all assignments and
         references for one such a local variable can be replaced by
         equivalent assignments and references to some static storage
         variable, thereby avoiding the need for a register.  In such
         cases we're forced to lie to debuggers and tell them that
         this variable was itself `static'.  */
      current_sym_code = N_LCSYM;
      letter = 'V';
      current_sym_addr = XEXP (XEXP (home, 0), 0);
    }
  else if (GET_CODE (home) == CONCAT)
    {
      tree subtype;

      /* If TYPE is not a COMPLEX_TYPE (it might be a RECORD_TYPE,
         for example), then there is no easy way to figure out
         what SUBTYPE should be.  So, we give up.  */
      if (TREE_CODE (type) != COMPLEX_TYPE)
        return 0;

      subtype = TREE_TYPE (type);

      /* If the variable's storage is in two parts,
         output each as a separate stab with a modified name.  */
      if (WORDS_BIG_ENDIAN)
        dbxout_symbol_location (decl, subtype, "$imag", XEXP (home, 0));
      else
        dbxout_symbol_location (decl, subtype, "$real", XEXP (home, 0));

      dbxout_prepare_symbol (decl);

      if (WORDS_BIG_ENDIAN)
        dbxout_symbol_location (decl, subtype, "$real", XEXP (home, 1));
      else
        dbxout_symbol_location (decl, subtype, "$imag", XEXP (home, 1));
      return 1;
    }
  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.  */
    return 0;

  /* Ok, start a symtab entry and output the variable name.  */
  FORCE_TEXT;

#ifdef DBX_STATIC_BLOCK_START
  DBX_STATIC_BLOCK_START (asmfile, current_sym_code);
#endif

  dbxout_symbol_name (decl, suffix, letter);
  dbxout_type (type, 0);
  dbxout_finish_symbol (decl);

#ifdef DBX_STATIC_BLOCK_END
  DBX_STATIC_BLOCK_END (asmfile, current_sym_code);
#endif
  return 1;
}
\f
/* Output the symbol name of DECL for a stabs, with suffix SUFFIX.
   Then output LETTER to indicate the kind of location the symbol has.  */

static void
dbxout_symbol_name (tree decl, const char *suffix, int letter)
{
  const char *name;

  if (DECL_CONTEXT (decl) 
      && (TYPE_P (DECL_CONTEXT (decl))
          || TREE_CODE (DECL_CONTEXT (decl)) == NAMESPACE_DECL))
    /* One slight hitch: if this is a VAR_DECL which is a class member
       or a namespace member, we must put out the mangled name instead of the
       DECL_NAME.  Note also that static member (variable) names DO NOT begin
       with underscores in .stabs directives.  */
    name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
  else
    /* ...but if we're function-local, we don't want to include the junk
       added by ASM_FORMAT_PRIVATE_NAME.  */
    name = IDENTIFIER_POINTER (DECL_NAME (decl));

  if (name == 0)
    name = "(anon)";
  fprintf (asmfile, "%s\"%s%s:", ASM_STABS_OP, name,
           (suffix ? suffix : ""));

  if (letter)
    putc (letter, asmfile);
}

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

  dbxout_source_file (asmfile, filename);
#endif

  /* Initialize variables used to communicate each symbol's debug
     information to dbxout_finish_symbol with zeroes.  */

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

static void
dbxout_finish_symbol (tree sym)
{
#ifdef DBX_FINISH_SYMBOL
  DBX_FINISH_SYMBOL (sym);
#else
  int line = 0;
  if (use_gnu_debug_info_extensions && sym != 0)
    line = DECL_SOURCE_LINE (sym);

  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);
#endif
}

/* Output definitions of all the decls in a chain. Return nonzero if
   anything was output */

int
dbxout_syms (tree syms)
{
  int result = 0;
  while (syms)
    {
      result += dbxout_symbol (syms, 1);
      syms = TREE_CHAIN (syms);
    }
  return result;
}
\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.  */

void
dbxout_parms (tree parms)
{
  ++debug_nesting;

  emit_pending_bincls_if_required ();

  for (; parms; parms = TREE_CHAIN (parms))
    if (DECL_NAME (parms)
        && TREE_TYPE (parms) != error_mark_node
        && DECL_RTL_SET_P (parms)
        && DECL_INCOMING_RTL (parms))
      {
        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, NULL_RTX);
        SET_DECL_RTL (parms, eliminate_regs (DECL_RTL (parms), 0, NULL_RTX));
#ifdef LEAF_REG_REMAP
        if (current_function_uses_only_leaf_regs)
          {
            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:%c", ASM_STABS_OP,
                         IDENTIFIER_POINTER (DECL_NAME (parms)),
                         DBX_MEMPARM_STABS_LETTER);
              }
            else
              {
                current_sym_nchars = 8;
                fprintf (asmfile, "%s\"(anon):%c", ASM_STABS_OP,
                         DBX_MEMPARM_STABS_LETTER);
              }

            /* It is quite tempting to use:

                   dbxout_type (TREE_TYPE (parms), 0);

               as the next statement, rather than using DECL_ARG_TYPE(), so
               that gcc reports the actual type of the parameter, rather
               than the promoted type.  This certainly makes GDB's life
               easier, at least for some ports.  The change is a bad idea
               however, since GDB expects to be able access the type without
               performing any conversions.  So for example, if we were
               passing a float to an unprototyped function, gcc will store a
               double on the stack, but if we emit a stab saying the type is a
               float, then gdb will only read in a single value, and this will
               produce an erroneous value.  */
            dbxout_type (DECL_ARG_TYPE (parms), 0);
            current_sym_value = DEBUGGER_ARG_OFFSET (current_sym_value, addr);
            dbxout_finish_symbol (parms);
          }
        else if (REG_P (DECL_RTL (parms)))
          {
            rtx best_rtl;
            char regparm_letter;
            tree parm_type;
            /* Parm passed in registers and lives in registers or nowhere.  */

            current_sym_code = DBX_REGPARM_STABS_CODE;
            regparm_letter = DBX_REGPARM_STABS_LETTER;
            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 we use DECL_RTL, then we must use the declared type of
               the variable, not the type that it arrived in.  */
            if (REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
              {
                best_rtl = DECL_RTL (parms);
                parm_type = TREE_TYPE (parms);
              }
            /* If the parm lives nowhere, use the register where it was
               passed.  It is also better to use the declared type here.  */
            else
              {
                best_rtl = DECL_INCOMING_RTL (parms);
                parm_type = TREE_TYPE (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:%c", ASM_STABS_OP,
                         IDENTIFIER_POINTER (DECL_NAME (parms)),
                         regparm_letter);
              }
            else
              {
                current_sym_nchars = 8;
                fprintf (asmfile, "%s\"(anon):%c", ASM_STABS_OP,
                         regparm_letter);
              }

            dbxout_type (parm_type, 0);
            dbxout_finish_symbol (parms);
          }
        else if (MEM_P (DECL_RTL (parms))
                 && REG_P (XEXP (DECL_RTL (parms), 0))
                 && REGNO (XEXP (DECL_RTL (parms), 0)) != HARD_FRAME_POINTER_REGNUM
                 && REGNO (XEXP (DECL_RTL (parms), 0)) != STACK_POINTER_REGNUM
#if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
                 && REGNO (XEXP (DECL_RTL (parms), 0)) != ARG_POINTER_REGNUM
#endif
                 )
          {
            /* Parm was passed via invisible reference.
               That is, its address was passed in a register.
               Output it as if it lived in that register.
               The debugger will know from the type
               that it was actually passed by invisible reference.  */

            char regparm_letter;
            /* Parm passed in registers and lives in registers or nowhere.  */

            current_sym_code = DBX_REGPARM_STABS_CODE;
            if (use_gnu_debug_info_extensions)
              regparm_letter = GDB_INV_REF_REGPARM_STABS_LETTER;
            else
              regparm_letter = DBX_REGPARM_STABS_LETTER;

            /* DECL_RTL looks like (MEM (REG...).  Get the register number.
               If it is an unallocated pseudo-reg, then use the register where
               it was passed instead.  */
            if (REGNO (XEXP (DECL_RTL (parms), 0)) < FIRST_PSEUDO_REGISTER)
              current_sym_value = REGNO (XEXP (DECL_RTL (parms), 0));
            else
              current_sym_value = REGNO (DECL_INCOMING_RTL (parms));

            current_sym_addr = 0;

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

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

            dbxout_type (TREE_TYPE (parms), 0);
            dbxout_finish_symbol (parms);
          }
        else if (MEM_P (DECL_RTL (parms))
                 && MEM_P (XEXP (DECL_RTL (parms), 0)))
          {
            /* Parm was passed via invisible reference, with the reference
               living on the stack.  DECL_RTL looks like
               (MEM (MEM (PLUS (REG ...) (CONST_INT ...)))) or it
               could look like (MEM (MEM (REG))).  */
            const char *const decl_name = (DECL_NAME (parms)
                                     ? IDENTIFIER_POINTER (DECL_NAME (parms))
                                     : "(anon)");
            if (REG_P (XEXP (XEXP (DECL_RTL (parms), 0), 0)))
              current_sym_value = 0;
            else
              current_sym_value
                = INTVAL (XEXP (XEXP (XEXP (DECL_RTL (parms), 0), 0), 1));
            current_sym_addr = 0;
            current_sym_code = N_PSYM;

            FORCE_TEXT;
            fprintf (asmfile, "%s\"%s:v", ASM_STABS_OP, decl_name);

            current_sym_value
              = DEBUGGER_ARG_OFFSET (current_sym_value,
                                     XEXP (XEXP (DECL_RTL (parms), 0), 0));
            dbxout_type (TREE_TYPE (parms), 0);
            dbxout_finish_symbol (parms);
          }
        else if (MEM_P (DECL_RTL (parms))
                 && XEXP (DECL_RTL (parms), 0) != const0_rtx
                 /* ??? A constant address for a parm can happen
                    when the reg it lives in is equiv to a constant in memory.
                    Should make this not happen, after 2.4.  */
                 && ! CONSTANT_P (XEXP (DECL_RTL (parms), 0)))
          {
            /* 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 ...)),
               in which case we use a value of zero.  */
            if (REG_P (XEXP (DECL_RTL (parms), 0)))
              current_sym_value = 0;
            else
                current_sym_value
                  = INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1));

            current_sym_addr = 0;

            /* Make a big endian correction if the mode of the type of the
               parameter is not the same as the mode of the rtl.  */
            if (BYTES_BIG_ENDIAN
                && TYPE_MODE (TREE_TYPE (parms)) != GET_MODE (DECL_RTL (parms))
                && GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (parms))) < UNITS_PER_WORD)
              {
                current_sym_value +=
                    GET_MODE_SIZE (GET_MODE (DECL_RTL (parms)))
                    - GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (parms)));
              }

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

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

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

/* 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.  */

void
dbxout_reg_parms (tree parms)
{
  ++debug_nesting;

  for (; parms; parms = TREE_CHAIN (parms))
    if (DECL_NAME (parms) && PARM_PASSED_IN_MEMORY (parms))
      {
        dbxout_prepare_symbol (parms);

        /* Report parms that live in registers during the function
           but were passed in memory.  */
        if (REG_P (DECL_RTL (parms))
            && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
          dbxout_symbol_location (parms, TREE_TYPE (parms),
                                  0, DECL_RTL (parms));
        else if (GET_CODE (DECL_RTL (parms)) == CONCAT)
          dbxout_symbol_location (parms, TREE_TYPE (parms),
                                  0, DECL_RTL (parms));
        /* Report parms that live in memory but not where they were passed.  */
        else if (MEM_P (DECL_RTL (parms))
                 && ! rtx_equal_p (DECL_RTL (parms), DECL_INCOMING_RTL (parms)))
          dbxout_symbol_location (parms, TREE_TYPE (parms),
                                  0, DECL_RTL (parms));
      }
  DBXOUT_DECR_NESTING;
}
\f
/* Given a chain of ..._TYPE nodes (as come in a parameter list),
   output definitions of those names, in raw form */

static void
dbxout_args (tree args)
{
  while (args)
    {
      putc (',', asmfile);
      dbxout_type (TREE_VALUE (args), 0);
      CHARS (1);
      args = TREE_CHAIN (args);
    }
}
\f
/* Subroutine of dbxout_block.  Emit an N_LBRAC stab referencing LABEL.
   BEGIN_LABEL is the name of the beginning of the function, which may
   be required.  */
static void
dbx_output_lbrac (const char *label,
                  const char *begin_label ATTRIBUTE_UNUSED)
{
#ifdef DBX_OUTPUT_LBRAC
  DBX_OUTPUT_LBRAC (asmfile, label);
#else
  fprintf (asmfile, "%s%d,0,0,", ASM_STABN_OP, N_LBRAC);
  assemble_name (asmfile, label);
#if DBX_BLOCKS_FUNCTION_RELATIVE
  putc ('-', asmfile);
  assemble_name (asmfile, begin_label);
#endif
  fprintf (asmfile, "\n");
#endif
}

/* Subroutine of dbxout_block.  Emit an N_RBRAC stab referencing LABEL.
   BEGIN_LABEL is the name of the beginning of the function, which may
   be required.  */
static void
dbx_output_rbrac (const char *label,
                  const char *begin_label ATTRIBUTE_UNUSED)
{
#ifdef DBX_OUTPUT_RBRAC
  DBX_OUTPUT_RBRAC (asmfile, label);
#else
  fprintf (asmfile, "%s%d,0,0,", ASM_STABN_OP, N_RBRAC);
  assemble_name (asmfile, label);
#if DBX_BLOCKS_FUNCTION_RELATIVE
  putc ('-', asmfile);
  assemble_name (asmfile, begin_label);
#endif
  fprintf (asmfile, "\n");
#endif
}

/* 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 (tree block, int depth, tree args)
{
  const char *begin_label;
  if (current_function_func_begin_label != NULL_TREE)
    begin_label = IDENTIFIER_POINTER (current_function_func_begin_label);
  else
    begin_label = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);

  while (block)
    {
      /* Ignore blocks never expanded or otherwise marked as real.  */
      if (TREE_USED (block) && TREE_ASM_WRITTEN (block))
        {
          int did_output;
          int blocknum = BLOCK_NUMBER (block);

          /* In dbx format, the syms of a block come before the N_LBRAC.
             If nothing is output, we don't need the N_LBRAC, either.  */
          did_output = 0;
          if (debug_info_level != DINFO_LEVEL_TERSE || depth == 0)
            did_output = dbxout_syms (BLOCK_VARS (block));
          if (args)
            dbxout_reg_parms (args);

          /* 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 (did_output)
            {
              char buf[20];
              const char *scope_start;

              if (depth == 0)
                /* The outermost block doesn't get LBB labels; use
                   the function symbol.  */
                scope_start = begin_label;
              else
                {
                  ASM_GENERATE_INTERNAL_LABEL (buf, "LBB", blocknum);
                  scope_start = buf;
                }

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

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

          /* Refer to the marker for the end of the block.  */
          if (did_output)
            {
              char buf[100];
              if (depth == 0)
                /* The outermost block doesn't get LBE labels;
                   use the "scope" label which will be emitted
                   by dbxout_function_end.  */
                ASM_GENERATE_INTERNAL_LABEL (buf, "Lscope", scope_labelno);
              else
                ASM_GENERATE_INTERNAL_LABEL (buf, "LBE", blocknum);

              dbx_output_rbrac (buf, begin_label);
            }
        }
      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.  */

#if defined (DBX_DEBUGGING_INFO)
static void
dbxout_begin_function (tree decl)
{
  int saved_tree_used1 = TREE_USED (decl);
  TREE_USED (decl) = 1;
  if (DECL_NAME (DECL_RESULT (decl)) != 0)
    {
      int saved_tree_used2 = TREE_USED (DECL_RESULT (decl));
      TREE_USED (DECL_RESULT (decl)) = 1;
      dbxout_symbol (decl, 0);
      TREE_USED (DECL_RESULT (decl)) = saved_tree_used2;
    }
  else
    dbxout_symbol (decl, 0);
  TREE_USED (decl) = saved_tree_used1;

  dbxout_parms (DECL_ARGUMENTS (decl));
  if (DECL_NAME (DECL_RESULT (decl)) != 0)
    dbxout_symbol (DECL_RESULT (decl), 1);
}
#endif /* DBX_DEBUGGING_INFO */

#endif /* DBX_DEBUGGING_INFO || XCOFF_DEBUGGING_INFO */

#include "gt-dbxout.h"