add old compiler with ARM support

1 files changed, 1674 insertions, 0 deletions

diff --git a/gcc_arm/sdbout.c b/gcc_arm/sdbout.c
new file mode 100755
index 0000000..1823155
--- /dev/null
+++ b/gcc_arm/sdbout.c
@@ -0,0 +1,1674 @@
+/* Output sdb-format symbol table information from GNU compiler.
+   Copyright (C) 1988, 92-97, 1998 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/*  mike@tredysvr.Tredydev.Unisys.COM says:
+I modified the struct.c example and have a nm of a .o resulting from the
+AT&T C compiler.  From the example below I would conclude the following:
+
+1. All .defs from structures are emitted as scanned.  The example below
+   clearly shows the symbol table entries for BoxRec2 are after the first
+   function.
+
+2. All functions and their locals (including statics) are emitted as scanned.
+
+3. All nested unnamed union and structure .defs must be emitted before
+   the structure in which they are nested.  The AT&T assembler is a
+   one pass beast as far as symbolics are concerned.
+
+4. All structure .defs are emitted before the typedefs that refer to them.
+
+5. All top level static and external variable definitions are moved to the
+   end of file with all top level statics occurring first before externs.
+
+6. All undefined references are at the end of the file.
+*/
+
+#include "config.h"
+
+#ifdef SDB_DEBUGGING_INFO
+
+#include "system.h"
+#include "tree.h"
+#include "rtl.h"
+#include "regs.h"
+#include "defaults.h"
+#include "flags.h"
+#include "insn-config.h"
+#include "reload.h"
+#include "output.h"
+#include "toplev.h"
+
+/* Mips systems use the SDB functions to dump out symbols, but do not
+   supply usable syms.h include files.  Which syms.h file to use is a
+   target parameter so don't use the native one if we're cross compiling.  */
+
+#if defined(USG) && !defined(MIPS) && !defined (hpux) && !defined(_WIN32) && !defined(__linux__) && !defined(CROSS_COMPILE)
+#include <syms.h>
+/* Use T_INT if we don't have T_VOID.  */
+#ifndef T_VOID
+#define T_VOID T_INT
+#endif
+#else
+#include "gsyms.h"
+#endif
+
+/* #include <storclass.h>  used to be this instead of syms.h.  */
+
+/* 1 if PARM is passed to this function in memory.  */
+
+#define PARM_PASSED_IN_MEMORY(PARM) \
+ (GET_CODE (DECL_INCOMING_RTL (PARM)) == MEM)
+
+/* A C expression for the integer offset value of an automatic variable
+   (C_AUTO) 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 (C_ARG)
+   having address X (an RTX).  The nominal offset is OFFSET.  */
+#ifndef DEBUGGER_ARG_OFFSET
+#define DEBUGGER_ARG_OFFSET(OFFSET, X) (OFFSET)
+#endif
+
+/* Line number of beginning of current function, minus one.
+   Negative means not in a function or not using sdb.  */
+
+int sdb_begin_function_line = -1;
+
+/* Counter to generate unique "names" for nameless struct members.  */
+
+static int unnamed_struct_number = 0;
+
+extern FILE *asm_out_file;
+
+extern tree current_function_decl;
+
+#include "sdbout.h"
+
+static char *gen_fake_label		PROTO((void));
+static int plain_type			PROTO((tree));
+static int template_name_p		PROTO((tree));
+static void sdbout_record_type_name	PROTO((tree));
+static int plain_type_1			PROTO((tree, int));
+static void sdbout_block		PROTO((tree));
+static void sdbout_syms			PROTO((tree));
+static void sdbout_queue_anonymous_type	PROTO((tree));
+static void sdbout_dequeue_anonymous_types PROTO((void));
+static void sdbout_type			PROTO((tree));
+static void sdbout_field_types		PROTO((tree));
+static void sdbout_one_type		PROTO((tree));
+static void sdbout_parms		PROTO((tree));
+static void sdbout_reg_parms		PROTO((tree));
+
+/* Define the default sizes for various types.  */
+
+#ifndef CHAR_TYPE_SIZE
+#define CHAR_TYPE_SIZE BITS_PER_UNIT
+#endif
+
+#ifndef SHORT_TYPE_SIZE
+#define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
+#endif
+
+#ifndef INT_TYPE_SIZE
+#define INT_TYPE_SIZE BITS_PER_WORD
+#endif
+
+#ifndef LONG_TYPE_SIZE
+#define LONG_TYPE_SIZE BITS_PER_WORD
+#endif
+
+#ifndef LONG_LONG_TYPE_SIZE
+#define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
+#endif
+
+#ifndef FLOAT_TYPE_SIZE
+#define FLOAT_TYPE_SIZE BITS_PER_WORD
+#endif
+
+#ifndef DOUBLE_TYPE_SIZE
+#define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
+#endif
+
+#ifndef LONG_DOUBLE_TYPE_SIZE
+#define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
+#endif
+
+/* Random macros describing parts of SDB data.  */
+
+/* Put something here if lines get too long */
+#define CONTIN
+
+/* Default value of delimiter is ";".  */
+#ifndef SDB_DELIM
+#define SDB_DELIM	";"
+#endif
+
+/* Maximum number of dimensions the assembler will allow.  */
+#ifndef SDB_MAX_DIM
+#define SDB_MAX_DIM 4
+#endif
+
+#ifndef PUT_SDB_SCL
+#define PUT_SDB_SCL(a) fprintf(asm_out_file, "\t.scl\t%d%s", (a), SDB_DELIM)
+#endif
+
+#ifndef PUT_SDB_INT_VAL
+#define PUT_SDB_INT_VAL(a) \
+ do {									\
+   fputs ("\t.val\t", asm_out_file);		       			\
+   fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC, (HOST_WIDE_INT)(a));	\
+   fprintf (asm_out_file, "%s", SDB_DELIM);				\
+ } while (0)
+
+#endif
+
+#ifndef PUT_SDB_VAL
+#define PUT_SDB_VAL(a)				\
+( fputs ("\t.val\t", asm_out_file),		\
+  output_addr_const (asm_out_file, (a)),	\
+  fprintf (asm_out_file, SDB_DELIM))
+#endif
+
+#ifndef PUT_SDB_DEF
+#define PUT_SDB_DEF(a)				\
+do { fprintf (asm_out_file, "\t.def\t");	\
+     ASM_OUTPUT_LABELREF (asm_out_file, a); 	\
+     fprintf (asm_out_file, SDB_DELIM); } while (0)
+#endif
+
+#ifndef PUT_SDB_PLAIN_DEF
+#define PUT_SDB_PLAIN_DEF(a) fprintf(asm_out_file,"\t.def\t.%s%s",a, SDB_DELIM)
+#endif
+
+#ifndef PUT_SDB_ENDEF
+#define PUT_SDB_ENDEF fputs("\t.endef\n", asm_out_file)
+#endif
+
+#ifndef PUT_SDB_TYPE
+#define PUT_SDB_TYPE(a) fprintf(asm_out_file, "\t.type\t0%o%s", a, SDB_DELIM)
+#endif
+
+#ifndef PUT_SDB_SIZE
+#define PUT_SDB_SIZE(a) \
+ do {									\
+   fputs ("\t.size\t", asm_out_file);					\
+   fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC, (HOST_WIDE_INT)(a));	\
+   fprintf (asm_out_file, "%s", SDB_DELIM);				\
+ } while(0)
+#endif
+
+#ifndef PUT_SDB_START_DIM
+#define PUT_SDB_START_DIM fprintf(asm_out_file, "\t.dim\t")
+#endif
+
+#ifndef PUT_SDB_NEXT_DIM
+#define PUT_SDB_NEXT_DIM(a) fprintf(asm_out_file, "%d,", a)
+#endif
+
+#ifndef PUT_SDB_LAST_DIM
+#define PUT_SDB_LAST_DIM(a) fprintf(asm_out_file, "%d%s", a, SDB_DELIM)
+#endif
+
+#ifndef PUT_SDB_TAG
+#define PUT_SDB_TAG(a)				\
+do { fprintf (asm_out_file, "\t.tag\t");	\
+     ASM_OUTPUT_LABELREF (asm_out_file, a);	\
+     fprintf (asm_out_file, SDB_DELIM); } while (0)
+#endif
+
+#ifndef PUT_SDB_BLOCK_START
+#define PUT_SDB_BLOCK_START(LINE)		\
+  fprintf (asm_out_file,			\
+	   "\t.def\t.bb%s\t.val\t.%s\t.scl\t100%s\t.line\t%d%s\t.endef\n", \
+	   SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
+#endif
+
+#ifndef PUT_SDB_BLOCK_END
+#define PUT_SDB_BLOCK_END(LINE)			\
+  fprintf (asm_out_file,			\
+	   "\t.def\t.eb%s\t.val\t.%s\t.scl\t100%s\t.line\t%d%s\t.endef\n",  \
+	   SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
+#endif
+
+#ifndef PUT_SDB_FUNCTION_START
+#define PUT_SDB_FUNCTION_START(LINE)		\
+  fprintf (asm_out_file,			\
+	   "\t.def\t.bf%s\t.val\t.%s\t.scl\t101%s\t.line\t%d%s\t.endef\n", \
+	   SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
+#endif
+
+#ifndef PUT_SDB_FUNCTION_END
+#define PUT_SDB_FUNCTION_END(LINE)		\
+  fprintf (asm_out_file,			\
+	   "\t.def\t.ef%s\t.val\t.%s\t.scl\t101%s\t.line\t%d%s\t.endef\n", \
+	   SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
+#endif
+
+#ifndef PUT_SDB_EPILOGUE_END
+#define PUT_SDB_EPILOGUE_END(NAME)			\
+do { fprintf (asm_out_file, "\t.def\t");		\
+     ASM_OUTPUT_LABELREF (asm_out_file, NAME);		\
+     fprintf (asm_out_file,				\
+	      "%s\t.val\t.%s\t.scl\t-1%s\t.endef\n",	\
+	      SDB_DELIM, SDB_DELIM, SDB_DELIM); } while (0)
+#endif
+
+#ifndef SDB_GENERATE_FAKE
+#define SDB_GENERATE_FAKE(BUFFER, NUMBER) \
+  sprintf ((BUFFER), ".%dfake", (NUMBER));
+#endif
+
+/* Return the sdb tag identifier string for TYPE
+   if TYPE has already been defined; otherwise return a null pointer.   */
+
+#define KNOWN_TYPE_TAG(type)  TYPE_SYMTAB_POINTER (type)
+
+/* Set the sdb tag identifier string for TYPE to NAME.  */
+
+#define SET_KNOWN_TYPE_TAG(TYPE, NAME) \
+  TYPE_SYMTAB_POINTER (TYPE) = (NAME)
+
+/* Return the name (a string) of the struct, union or enum tag
+   described by the TREE_LIST node LINK.  This is 0 for an anonymous one.  */
+
+#define TAG_NAME(link) \
+  (((link) && TREE_PURPOSE ((link)) \
+    && IDENTIFIER_POINTER (TREE_PURPOSE ((link)))) \
+   ? IDENTIFIER_POINTER (TREE_PURPOSE ((link))) : (char *) 0)
+
+/* Ensure we don't output a negative line number.  */
+#define MAKE_LINE_SAFE(line)  \
+  if (line <= sdb_begin_function_line) line = sdb_begin_function_line + 1
+
+/* Perform linker optimization of merging header file definitions together
+   for targets with MIPS_DEBUGGING_INFO defined.  This won't work without a
+   post 960826 version of GAS.  Nothing breaks with earlier versions of GAS,
+   the optimization just won't be done.  The native assembler already has the
+   necessary support.  */
+
+#ifdef MIPS_DEBUGGING_INFO
+
+#ifndef PUT_SDB_SRC_FILE
+#define PUT_SDB_SRC_FILE(FILENAME) \
+output_file_directive (asm_out_file, (FILENAME))
+#endif
+
+/* ECOFF linkers have an optimization that does the same kind of thing as
+   N_BINCL/E_INCL in stabs: eliminate duplicate debug information in the
+   executable.  To achieve this, GCC must output a .file for each file
+   name change.  */
+
+/* This is a stack of input files.  */
+
+struct sdb_file
+{
+  struct sdb_file *next;
+  char *name;
+};
+
+/* This is the top of the stack.  */
+
+static struct sdb_file *current_file;
+
+#endif /* MIPS_DEBUGGING_INFO */
+
+/* Set up for SDB output at the start of compilation.  */
+
+void
+sdbout_init (asm_file, input_file_name, syms)
+     FILE *asm_file;
+     char *input_file_name;
+     tree syms;
+{
+#ifdef MIPS_DEBUGGING_INFO
+  current_file = (struct sdb_file *) xmalloc (sizeof *current_file);
+  current_file->next = NULL;
+  current_file->name = input_file_name;
+#endif
+
+#ifdef RMS_QUICK_HACK_1
+  tree t;
+  for (t = syms; t; t = TREE_CHAIN (t))
+    if (DECL_NAME (t) && IDENTIFIER_POINTER (DECL_NAME (t)) != 0
+	&& !strcmp (IDENTIFIER_POINTER (DECL_NAME (t)), "__vtbl_ptr_type"))
+      sdbout_symbol (t, 0);
+#endif  
+}
+
+#if 0
+
+/* return the tag identifier for type
+ */
+
+char *
+tag_of_ru_type (type,link)
+     tree type,link;
+{
+  if (TYPE_SYMTAB_ADDRESS (type))
+    return TYPE_SYMTAB_ADDRESS (type);
+  if (link && TREE_PURPOSE (link)
+      && IDENTIFIER_POINTER (TREE_PURPOSE (link)))
+    TYPE_SYMTAB_ADDRESS (type) = IDENTIFIER_POINTER (TREE_PURPOSE (link));
+  else
+    return (char *) TYPE_SYMTAB_ADDRESS (type);
+}
+#endif
+
+/* Return a unique string to name an anonymous type.  */
+
+static char *
+gen_fake_label ()
+{
+  char label[10];
+  char *labelstr;
+  SDB_GENERATE_FAKE (label, unnamed_struct_number);
+  unnamed_struct_number++;
+  labelstr = (char *) permalloc (strlen (label) + 1);
+  strcpy (labelstr, label);
+  return labelstr;
+}
+
+/* Return the number which describes TYPE for SDB.
+   For pointers, etc., this function is recursive.
+   Each record, union or enumeral type must already have had a
+   tag number output.  */
+
+/* The number is given by d6d5d4d3d2d1bbbb
+   where bbbb is 4 bit basic type, and di indicate  one of notype,ptr,fn,array.
+   Thus, char *foo () has bbbb=T_CHAR
+			  d1=D_FCN
+			  d2=D_PTR
+ N_BTMASK=     017       1111     basic type field.
+ N_TSHIFT=       2                derived type shift
+ N_BTSHFT=       4                Basic type shift */
+
+/* Produce the number that describes a pointer, function or array type.
+   PREV is the number describing the target, value or element type.
+   DT_type describes how to transform that type.  */
+#define PUSH_DERIVED_LEVEL(DT_type,PREV)		\
+  ((((PREV) & ~(int)N_BTMASK) << (int)N_TSHIFT)		\
+   | ((int)DT_type << (int)N_BTSHFT)			\
+   | ((PREV) & (int)N_BTMASK))
+
+/* Number of elements used in sdb_dims.  */
+static int sdb_n_dims = 0;
+
+/* Table of array dimensions of current type.  */
+static int sdb_dims[SDB_MAX_DIM];
+
+/* Size of outermost array currently being processed.  */
+static int sdb_type_size = -1;
+
+static int
+plain_type (type)
+     tree type;
+{
+  int val = plain_type_1 (type, 0);
+
+  /* If we have already saved up some array dimensions, print them now.  */
+  if (sdb_n_dims > 0)
+    {
+      int i;
+      PUT_SDB_START_DIM;
+      for (i = sdb_n_dims - 1; i > 0; i--)
+	PUT_SDB_NEXT_DIM (sdb_dims[i]);
+      PUT_SDB_LAST_DIM (sdb_dims[0]);
+      sdb_n_dims = 0;
+
+      sdb_type_size = int_size_in_bytes (type);
+      /* Don't kill sdb if type is not laid out or has variable size.  */
+      if (sdb_type_size < 0)
+	sdb_type_size = 0;
+    }
+  /* If we have computed the size of an array containing this type,
+     print it now.  */
+  if (sdb_type_size >= 0)
+    {
+      PUT_SDB_SIZE (sdb_type_size);
+      sdb_type_size = -1;
+    }
+  return val;
+}
+
+static int
+template_name_p (name)
+     tree name;
+{
+  register char *ptr = IDENTIFIER_POINTER (name);
+  while (*ptr && *ptr != '<')
+    ptr++;
+
+  return *ptr != '\0';
+}
+
+static void
+sdbout_record_type_name (type)
+     tree type;
+{
+  char *name = 0;
+  int no_name;
+
+  if (KNOWN_TYPE_TAG (type))
+    return;
+
+  if (TYPE_NAME (type) != 0)
+    {
+      tree t = 0;
+      /* Find the IDENTIFIER_NODE for the type name.  */
+      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));
+	  /* The DECL_NAME for templates includes "<>", which breaks
+	     most assemblers.  Use its assembler name instead, which
+	     has been mangled into being safe.  */
+	  if (t && template_name_p (t))
+	    t = DECL_ASSEMBLER_NAME (TYPE_NAME (type));
+	}
+
+      /* Now get the name as a string, or invent one.  */
+      if (t != NULL_TREE)
+	name = IDENTIFIER_POINTER (t);
+    }
+
+  no_name = (name == 0 || *name == 0);
+  if (no_name)
+    name = gen_fake_label ();
+
+  SET_KNOWN_TYPE_TAG (type, name);
+#ifdef SDB_ALLOW_FORWARD_REFERENCES
+  if (no_name)
+    sdbout_queue_anonymous_type (type);
+#endif
+}
+
+/* Return the .type value for type TYPE.
+
+   LEVEL indicates how many levels deep we have recursed into the type.
+   The SDB debug format can only represent 6 derived levels of types.
+   After that, we must output inaccurate debug info.  We deliberately
+   stop before the 7th level, so that ADA recursive types will not give an
+   infinite loop.  */
+
+static int
+plain_type_1 (type, level)
+     tree type;
+     int level;
+{
+  if (type == 0)
+    type = void_type_node;
+  else if (type == error_mark_node)
+    type = integer_type_node;
+  else
+    type = TYPE_MAIN_VARIANT (type);
+
+  switch (TREE_CODE (type))
+    {
+    case VOID_TYPE:
+      return T_VOID;
+    case INTEGER_TYPE:
+      {
+	int size = int_size_in_bytes (type) * BITS_PER_UNIT;
+
+	/* Carefully distinguish all the standard types of C,
+	   without messing up if the language is not C.
+	   Note that we check only for the names that contain spaces;
+	   other names might occur by coincidence in other languages.  */
+	if (TYPE_NAME (type) != 0
+	    && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
+	    && DECL_NAME (TYPE_NAME (type)) != 0
+	    && TREE_CODE (DECL_NAME (TYPE_NAME (type))) == IDENTIFIER_NODE)
+	  {
+	    char *name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
+
+	    if (!strcmp (name, "char"))
+	      return T_CHAR;
+	    if (!strcmp (name, "unsigned char"))
+	      return T_UCHAR;
+	    if (!strcmp (name, "signed char"))
+	      return T_CHAR;
+	    if (!strcmp (name, "int"))
+	      return T_INT;
+	    if (!strcmp (name, "unsigned int"))
+	      return T_UINT;
+	    if (!strcmp (name, "short int"))
+	      return T_SHORT;
+	    if (!strcmp (name, "short unsigned int"))
+	      return T_USHORT;
+	    if (!strcmp (name, "long int"))
+	      return T_LONG;
+	    if (!strcmp (name, "long unsigned int"))
+	      return T_ULONG;
+	  }
+
+	if (size == INT_TYPE_SIZE)
+	  return (TREE_UNSIGNED (type) ? T_UINT : T_INT);
+	if (size == CHAR_TYPE_SIZE)
+	  return (TREE_UNSIGNED (type) ? T_UCHAR : T_CHAR);
+	if (size == SHORT_TYPE_SIZE)
+	  return (TREE_UNSIGNED (type) ? T_USHORT : T_SHORT);
+	if (size == LONG_TYPE_SIZE)
+	  return (TREE_UNSIGNED (type) ? T_ULONG : T_LONG);
+	if (size == LONG_LONG_TYPE_SIZE)	/* better than nothing */
+	  return (TREE_UNSIGNED (type) ? T_ULONG : T_LONG);
+	return 0;
+      }
+
+    case REAL_TYPE:
+      {
+	int precision = TYPE_PRECISION (type);
+	if (precision == FLOAT_TYPE_SIZE)
+	  return T_FLOAT;
+	if (precision == DOUBLE_TYPE_SIZE)
+	  return T_DOUBLE;
+#ifdef EXTENDED_SDB_BASIC_TYPES
+	if (precision == LONG_DOUBLE_TYPE_SIZE)
+	  return T_LNGDBL;
+#else
+	if (precision == LONG_DOUBLE_TYPE_SIZE)
+	  return T_DOUBLE;	/* better than nothing */
+#endif
+	return 0;
+      }
+
+    case ARRAY_TYPE:
+      {
+	int m;
+	if (level >= 6)
+	  return T_VOID;
+	else
+	  m = plain_type_1 (TREE_TYPE (type), level+1);
+	if (sdb_n_dims < SDB_MAX_DIM)
+	  sdb_dims[sdb_n_dims++]
+	    = (TYPE_DOMAIN (type)
+	       && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
+	       && TREE_CODE (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) == INTEGER_CST
+	       && TREE_CODE (TYPE_MIN_VALUE (TYPE_DOMAIN (type))) == INTEGER_CST
+	       ? (TREE_INT_CST_LOW (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))
+		  - TREE_INT_CST_LOW (TYPE_MIN_VALUE (TYPE_DOMAIN (type))) + 1)
+	       : 0);
+	return PUSH_DERIVED_LEVEL (DT_ARY, m);
+      }
+
+    case RECORD_TYPE:
+    case UNION_TYPE:
+    case QUAL_UNION_TYPE:
+    case ENUMERAL_TYPE:
+      {
+	char *tag;
+#ifdef SDB_ALLOW_FORWARD_REFERENCES
+	sdbout_record_type_name (type);
+#endif
+#ifndef SDB_ALLOW_UNKNOWN_REFERENCES
+	if ((TREE_ASM_WRITTEN (type) && KNOWN_TYPE_TAG (type) != 0)
+#ifdef SDB_ALLOW_FORWARD_REFERENCES
+	    || TYPE_MODE (type) != VOIDmode
+#endif
+	    )
+#endif
+	  {
+	    /* Output the referenced structure tag name
+	       only if the .def has already been finished.
+	       At least on 386, the Unix assembler
+	       cannot handle forward references to tags.  */
+	    /* But the 88100, it requires them, sigh...  */
+	    /* And the MIPS requires unknown refs as well...  */
+	    tag = KNOWN_TYPE_TAG (type);
+	    PUT_SDB_TAG (tag);
+	    /* These 3 lines used to follow the close brace.
+	       However, a size of 0 without a tag implies a tag of 0,
+	       so if we don't know a tag, we can't mention the size.  */
+	    sdb_type_size = int_size_in_bytes (type);
+	    if (sdb_type_size < 0)
+	      sdb_type_size = 0;
+	  }
+	return ((TREE_CODE (type) == RECORD_TYPE) ? T_STRUCT
+		: (TREE_CODE (type) == UNION_TYPE) ? T_UNION
+		: (TREE_CODE (type) == QUAL_UNION_TYPE) ? T_UNION
+		: T_ENUM);
+      }
+    case POINTER_TYPE:
+    case REFERENCE_TYPE:
+      {
+	int m;
+	if (level >= 6)
+	  return T_VOID;
+	else
+	  m = plain_type_1 (TREE_TYPE (type), level+1);
+	return PUSH_DERIVED_LEVEL (DT_PTR, m);
+      }
+    case FUNCTION_TYPE:
+    case METHOD_TYPE:
+      {
+	int m;
+	if (level >= 6)
+	  return T_VOID;
+	else
+	  m = plain_type_1 (TREE_TYPE (type), level+1);
+	return PUSH_DERIVED_LEVEL (DT_FCN, m);
+      }
+    default:
+      return 0;
+    }
+}
+
+/* Output the symbols defined in block number DO_BLOCK.
+   Set NEXT_BLOCK_NUMBER to 0 before calling.
+
+   This function works by walking the tree structure of blocks,
+   counting blocks until it finds the desired block.  */
+
+static int do_block = 0;
+
+static int next_block_number;
+
+static void
+sdbout_block (block)
+     register tree block;
+{
+  while (block)
+    {
+      /* Ignore blocks never expanded or otherwise marked as real.  */
+      if (TREE_USED (block))
+	{
+	  /* When we reach the specified block, output its symbols.  */
+	  if (next_block_number == do_block)
+	    {
+	      sdbout_syms (BLOCK_VARS (block));
+	    }
+
+	  /* If we are past the specified block, stop the scan.  */
+	  if (next_block_number > do_block)
+	    return;
+
+	  next_block_number++;
+
+	  /* Scan the blocks within this block.  */
+	  sdbout_block (BLOCK_SUBBLOCKS (block));
+	}
+
+      block = BLOCK_CHAIN (block);
+    }
+}
+
+/* Call sdbout_symbol on each decl in the chain SYMS.  */
+
+static void
+sdbout_syms (syms)
+     tree syms;
+{
+  while (syms)
+    {
+      if (TREE_CODE (syms) != LABEL_DECL)
+	sdbout_symbol (syms, 1);
+      syms = TREE_CHAIN (syms);
+    }
+}
+
+/* Output SDB information for a symbol described by DECL.
+   LOCAL is nonzero if the symbol is not file-scope.  */
+
+void
+sdbout_symbol (decl, local)
+     tree decl;
+     int local;
+{
+  tree type = TREE_TYPE (decl);
+  tree context = NULL_TREE;
+  rtx value;
+  int regno = -1;
+  char *name;
+
+  sdbout_one_type (type);
+
+#if 0 /* This loses when functions are marked to be ignored,
+	 which happens in the C++ front end.  */
+  if (DECL_IGNORED_P (decl))
+    return;
+#endif
+
+  switch (TREE_CODE (decl))
+    {
+    case CONST_DECL:
+      /* Enum values are defined by defining the enum type.  */
+      return;
+
+    case FUNCTION_DECL:
+      /* Don't mention a nested function under its parent.  */
+      context = decl_function_context (decl);
+      if (context == current_function_decl)
+	return;
+      /* Check DECL_INITIAL to distinguish declarations from definitions.
+	 Don't output debug info here for declarations; they will have
+	 a DECL_INITIAL value of 0.  */
+      if (! DECL_INITIAL (decl))
+	return;
+      if (GET_CODE (DECL_RTL (decl)) != MEM
+	  || GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF)
+	return;
+      PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
+      PUT_SDB_VAL (XEXP (DECL_RTL (decl), 0));
+      PUT_SDB_SCL (TREE_PUBLIC (decl) ? C_EXT : C_STAT);
+      break;
+
+    case TYPE_DECL:
+      /* Done with tagged types.  */
+      if (DECL_NAME (decl) == 0)
+	return;
+      if (DECL_IGNORED_P (decl))
+	return;
+
+      /* Output typedef name.  */
+      if (template_name_p (DECL_NAME (decl)))
+	PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
+      else
+	PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_NAME (decl)));
+      PUT_SDB_SCL (C_TPDEF);
+      break;
+
+    case PARM_DECL:
+      /* Parm decls go in their own separate chains
+	 and are output by sdbout_reg_parms and sdbout_parms.  */
+      abort ();
+
+    case VAR_DECL:
+      /* Don't mention a variable that is external.
+	 Let the file that defines it describe it.  */
+      if (DECL_EXTERNAL (decl))
+	return;
+
+      /* Ignore __FUNCTION__, etc.  */
+      if (DECL_IGNORED_P (decl))
+	return;
+
+      /* If there was an error in the declaration, don't dump core
+	 if there is no RTL associated with the variable doesn't
+	 exist.  */
+      if (DECL_RTL (decl) == 0)
+	return;
+
+      DECL_RTL (decl) = eliminate_regs (DECL_RTL (decl), 0, NULL_RTX);
+#ifdef LEAF_REG_REMAP
+      if (leaf_function)
+	leaf_renumber_regs_insn (DECL_RTL (decl));
+#endif
+      value = DECL_RTL (decl);
+
+      /* Don't mention a variable at all
+	 if it was completely optimized into nothingness.
+
+	 If DECL was from an inline function, then its rtl
+	 is not identically the rtl that was used in this
+	 particular compilation.  */
+      if (GET_CODE (value) == REG)
+	{
+	  regno = REGNO (DECL_RTL (decl));
+	  if (regno >= FIRST_PSEUDO_REGISTER)
+	    return;
+	}
+      else if (GET_CODE (value) == SUBREG)
+	{
+	  int offset = 0;
+	  while (GET_CODE (value) == SUBREG)
+	    {
+	      offset += SUBREG_WORD (value);
+	      value = SUBREG_REG (value);
+	    }
+	  if (GET_CODE (value) == REG)
+	    {
+	      regno = REGNO (value);
+	      if (regno >= FIRST_PSEUDO_REGISTER)
+		return;
+	      regno += offset;
+	    }
+	  alter_subreg (DECL_RTL (decl));
+	  value = DECL_RTL (decl);
+	}
+      /* Don't output anything if an auto variable
+	 gets RTL that is static.
+	 GAS version 2.2 can't handle such output.  */
+      else if (GET_CODE (value) == MEM && CONSTANT_P (XEXP (value, 0))
+	       && ! TREE_STATIC (decl))
+	return;
+
+      /* Emit any structure, union, or enum type that has not been output.
+	 This occurs for tag-less structs (et al) used to declare variables
+	 within functions.  */
+      if (TREE_CODE (type) == ENUMERAL_TYPE
+	  || TREE_CODE (type) == RECORD_TYPE
+	  || TREE_CODE (type) == UNION_TYPE
+	  || TREE_CODE (type) == QUAL_UNION_TYPE)
+	{
+	  if (TYPE_SIZE (type) != 0		/* not a forward reference */
+	      && KNOWN_TYPE_TAG (type) == 0)	/* not yet declared */
+	    sdbout_one_type (type);
+	}
+
+      /* Defer SDB information for top-level initialized variables! */
+      if (! local
+	  && GET_CODE (value) == MEM
+	  && DECL_INITIAL (decl))
+	return;
+
+      /* C++ in 2.3 makes nameless symbols.  That will be fixed later.
+	 For now, avoid crashing.  */
+      if (DECL_NAME (decl) == NULL_TREE)
+	return;
+
+      /* Record the name for, starting a symtab entry.  */
+      name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
+
+      if (GET_CODE (value) == MEM
+	  && GET_CODE (XEXP (value, 0)) == SYMBOL_REF)
+	{
+	  PUT_SDB_DEF (name);
+	  if (TREE_PUBLIC (decl))
+	    {
+	      PUT_SDB_VAL (XEXP (value, 0));
+              PUT_SDB_SCL (C_EXT);
+	    }
+	  else
+	    {
+	      PUT_SDB_VAL (XEXP (value, 0));
+              PUT_SDB_SCL (C_STAT);
+	    }
+	}
+      else if (regno >= 0)
+	{
+	  PUT_SDB_DEF (name);
+	  PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (regno));
+	  PUT_SDB_SCL (C_REG);
+	}
+      else if (GET_CODE (value) == MEM
+	       && (GET_CODE (XEXP (value, 0)) == MEM
+		   || (GET_CODE (XEXP (value, 0)) == REG
+		       && REGNO (XEXP (value, 0)) != HARD_FRAME_POINTER_REGNUM
+		       && REGNO (XEXP (value, 0)) != STACK_POINTER_REGNUM)))
+	/* If the value is indirect by memory or by a register
+	   that isn't the frame pointer
+	   then it means the object is variable-sized and address through
+	   that register or stack slot.  COFF has no way to represent this
+	   so all we can do is output the variable as a pointer.  */
+	{
+	  PUT_SDB_DEF (name);
+	  if (GET_CODE (XEXP (value, 0)) == REG)
+	    {
+	      PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (XEXP (value, 0))));
+	      PUT_SDB_SCL (C_REG);
+	    }
+	  else
+	    {
+	      /* DECL_RTL looks like (MEM (MEM (PLUS (REG...)
+		 (CONST_INT...)))).
+		 We want the value of that CONST_INT.  */
+	      /* Encore compiler hates a newline in a macro arg, it seems.  */
+	      PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET
+			       (XEXP (XEXP (value, 0), 0)));
+	      PUT_SDB_SCL (C_AUTO);
+	    }
+
+	  type = build_pointer_type (TREE_TYPE (decl));
+	}
+      else if (GET_CODE (value) == MEM
+	       && ((GET_CODE (XEXP (value, 0)) == PLUS
+		    && GET_CODE (XEXP (XEXP (value, 0), 0)) == REG
+		    && GET_CODE (XEXP (XEXP (value, 0), 1)) == CONST_INT)
+		   /* This is for variables which are at offset zero from
+		      the frame pointer.  This happens on the Alpha.
+		      Non-frame pointer registers are excluded above.  */
+		   || (GET_CODE (XEXP (value, 0)) == REG)))
+	{
+	  /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...)))
+	     or (MEM (REG...)).  We want the value of that CONST_INT
+	     or zero.  */
+	  PUT_SDB_DEF (name);
+	  PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET (XEXP (value, 0)));
+	  PUT_SDB_SCL (C_AUTO);
+	}
+      else if (GET_CODE (value) == MEM && GET_CODE (XEXP (value, 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 DECL_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'.  */
+	  PUT_SDB_DEF (name);
+	  PUT_SDB_VAL (XEXP (XEXP (value, 0), 0));
+	  PUT_SDB_SCL (C_STAT);
+	}
+      else
+	{
+	  /* It is something we don't know how to represent for SDB.  */
+	  return;
+	}
+      break;
+
+    default:
+      break;
+    }
+  PUT_SDB_TYPE (plain_type (type));
+  PUT_SDB_ENDEF;
+}
+
+/* Output SDB information for a top-level initialized variable
+   that has been delayed.  */
+
+void
+sdbout_toplevel_data (decl)
+     tree decl;
+{
+  tree type = TREE_TYPE (decl);
+
+  if (DECL_IGNORED_P (decl))
+    return;
+
+  if (! (TREE_CODE (decl) == VAR_DECL
+	 && GET_CODE (DECL_RTL (decl)) == MEM
+	 && DECL_INITIAL (decl)))
+    abort ();
+
+  PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
+  PUT_SDB_VAL (XEXP (DECL_RTL (decl), 0));
+  if (TREE_PUBLIC (decl))
+    {
+      PUT_SDB_SCL (C_EXT);
+    }
+  else
+    {
+      PUT_SDB_SCL (C_STAT);
+    }
+  PUT_SDB_TYPE (plain_type (type));
+  PUT_SDB_ENDEF;
+}
+
+#ifdef SDB_ALLOW_FORWARD_REFERENCES
+
+/* Machinery to record and output anonymous types.  */
+
+static tree anonymous_types;
+
+static void
+sdbout_queue_anonymous_type (type)
+     tree type;
+{
+  anonymous_types = saveable_tree_cons (NULL_TREE, type, anonymous_types);
+}
+
+static void
+sdbout_dequeue_anonymous_types ()
+{
+  register tree types, link;
+
+  while (anonymous_types)
+    {
+      types = nreverse (anonymous_types);
+      anonymous_types = NULL_TREE;
+
+      for (link = types; link; link = TREE_CHAIN (link))
+	{
+	  register tree type = TREE_VALUE (link);
+
+	  if (type && ! TREE_ASM_WRITTEN (type))
+	    sdbout_one_type (type);
+	}
+    }
+}
+
+#endif
+
+/* Given a chain of ..._TYPE nodes, all of which have names,
+   output definitions of those names, as typedefs.  */
+
+void
+sdbout_types (types)
+     register tree types;
+{
+  register tree link;
+
+  for (link = types; link; link = TREE_CHAIN (link))
+    sdbout_one_type (link);
+
+#ifdef SDB_ALLOW_FORWARD_REFERENCES
+  sdbout_dequeue_anonymous_types ();
+#endif
+}
+
+static void
+sdbout_type (type)
+     tree type;
+{
+  if (type == error_mark_node)
+    type = integer_type_node;
+  PUT_SDB_TYPE (plain_type (type));
+}
+
+/* Output types of the fields of type TYPE, if they are structs.
+
+   Formerly did not chase through pointer types, since that could be circular.
+   They must come before TYPE, since forward refs are not allowed.
+   Now james@bigtex.cactus.org says to try them.  */
+
+static void
+sdbout_field_types (type)
+     tree type;
+{
+  tree tail;
+
+  for (tail = TYPE_FIELDS (type); tail; tail = TREE_CHAIN (tail))
+    /* This condition should match the one for emitting the actual members
+       below.  */
+    if (TREE_CODE (tail) == FIELD_DECL
+	&& DECL_NAME (tail) != 0
+	&& TREE_CODE (DECL_SIZE (tail)) == INTEGER_CST
+	&& TREE_CODE (DECL_FIELD_BITPOS (tail)) == INTEGER_CST)
+      {
+	if (POINTER_TYPE_P (TREE_TYPE (tail)))
+	  sdbout_one_type (TREE_TYPE (TREE_TYPE (tail)));
+	else
+	  sdbout_one_type (TREE_TYPE (tail));
+      }
+}
+
+/* Use this to put out the top level defined record and union types
+   for later reference.  If this is a struct with a name, then put that
+   name out.  Other unnamed structs will have .xxfake labels generated so
+   that they may be referred to later.
+   The label will be stored in the KNOWN_TYPE_TAG slot of a type.
+   It may NOT be called recursively.  */
+
+static void
+sdbout_one_type (type)
+     tree type;
+{
+  if (current_function_decl != NULL_TREE
+      && DECL_SECTION_NAME (current_function_decl) != NULL_TREE)
+    ; /* Don't change section amid function.  */
+  else
+    text_section ();
+
+  switch (TREE_CODE (type))
+    {
+    case RECORD_TYPE:
+    case UNION_TYPE:
+    case QUAL_UNION_TYPE:
+    case ENUMERAL_TYPE:
+      type = TYPE_MAIN_VARIANT (type);
+      /* Don't output a type twice.  */
+      if (TREE_ASM_WRITTEN (type))
+	/* James said test TREE_ASM_BEING_WRITTEN here.  */
+	return;
+
+      /* Output nothing if type is not yet defined.  */
+      if (TYPE_SIZE (type) == 0)
+	return;
+
+      TREE_ASM_WRITTEN (type) = 1;
+#if 1
+      /* This is reputed to cause trouble with the following case,
+	 but perhaps checking TYPE_SIZE above will fix it.  */
+
+      /* Here is a test case:
+
+	struct foo {
+	  struct badstr *bbb;
+	} forwardref;
+
+	typedef struct intermediate {
+	  int aaaa;
+	} intermediate_ref;
+
+	typedef struct badstr {
+	  int ccccc;
+	} badtype;   */
+
+#if 0
+      TREE_ASM_BEING_WRITTEN (type) = 1;
+#endif
+      /* This change, which ought to make better output,
+	 used to make the COFF assembler unhappy.
+	 Changes involving KNOWN_TYPE_TAG may fix the problem.  */
+      /* Before really doing anything, output types we want to refer to.  */
+      /* Note that in version 1 the following two lines
+	 are not used if forward references are in use.  */
+      if (TREE_CODE (type) != ENUMERAL_TYPE)
+	sdbout_field_types (type);
+#if 0
+      TREE_ASM_WRITTEN (type) = 1;
+#endif
+#endif
+
+      /* Output a structure type.  */
+      {
+	int size = int_size_in_bytes (type);
+	int member_scl;
+	tree tem;
+	int i, n_baseclasses = 0;
+
+	/* Record the type tag, but not in its permanent place just yet.  */
+	sdbout_record_type_name (type);
+
+	PUT_SDB_DEF (KNOWN_TYPE_TAG (type));
+
+	switch (TREE_CODE (type))
+	  {
+	  case UNION_TYPE:
+	  case QUAL_UNION_TYPE:
+	    PUT_SDB_SCL (C_UNTAG);
+	    PUT_SDB_TYPE (T_UNION);
+	    member_scl = C_MOU;
+	    break;
+
+	  case RECORD_TYPE:
+	    PUT_SDB_SCL (C_STRTAG);
+	    PUT_SDB_TYPE (T_STRUCT);
+	    member_scl = C_MOS;
+	    break;
+
+	  case ENUMERAL_TYPE:
+	    PUT_SDB_SCL (C_ENTAG);
+	    PUT_SDB_TYPE (T_ENUM);
+	    member_scl = C_MOE;
+	    break;
+
+	  default:
+	    break;
+	  }
+
+	PUT_SDB_SIZE (size);
+	PUT_SDB_ENDEF;
+
+	/* Print out the base class information with fields
+	   named after the types they hold.  */
+	/* This is only relevent to aggregate types.  TYPE_BINFO is used
+	   for other purposes in an ENUMERAL_TYPE, so we must exclude that
+	   case.  */
+	if (TREE_CODE (type) != ENUMERAL_TYPE)
+	  {
+	    if (TYPE_BINFO (type)
+		&& TYPE_BINFO_BASETYPES (type))
+	      n_baseclasses = TREE_VEC_LENGTH (TYPE_BINFO_BASETYPES (type));
+	    for (i = 0; i < n_baseclasses; i++)
+	      {
+		tree child = TREE_VEC_ELT (BINFO_BASETYPES (TYPE_BINFO (type)),
+					   i);
+		tree child_type = BINFO_TYPE (child);
+		tree child_type_name;
+		if (TYPE_NAME (child_type) == 0)
+		  continue;
+		if (TREE_CODE (TYPE_NAME (child_type)) == IDENTIFIER_NODE)
+		  child_type_name = TYPE_NAME (child_type);
+		else if (TREE_CODE (TYPE_NAME (child_type)) == TYPE_DECL)
+		  {
+		    child_type_name = DECL_NAME (TYPE_NAME (child_type));
+		    if (child_type_name && template_name_p (child_type_name))
+		      child_type_name
+			= DECL_ASSEMBLER_NAME (TYPE_NAME (child_type));
+		  }
+		else
+		  continue;
+
+		CONTIN;
+		PUT_SDB_DEF (IDENTIFIER_POINTER (child_type_name));
+		PUT_SDB_INT_VAL (TREE_INT_CST_LOW (BINFO_OFFSET (child)));
+		PUT_SDB_SCL (member_scl);
+		sdbout_type (BINFO_TYPE (child));
+		PUT_SDB_ENDEF;
+	      }
+	  }
+
+	/* output the individual fields */
+
+	if (TREE_CODE (type) == ENUMERAL_TYPE)
+	  for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem))
+	    {
+	      PUT_SDB_DEF (IDENTIFIER_POINTER (TREE_PURPOSE (tem)));
+	      PUT_SDB_INT_VAL (TREE_INT_CST_LOW (TREE_VALUE (tem)));
+	      PUT_SDB_SCL (C_MOE);
+	      PUT_SDB_TYPE (T_MOE);
+	      PUT_SDB_ENDEF;
+	    }
+
+	else			/* record or union type */
+	  for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem))
+	    /* Output the name, type, position (in bits), size (in bits)
+	       of each field.  */
+
+	    /* Omit here the nameless fields that are used to skip bits.
+	       Also omit fields with variable size or position.
+	       Also omit non FIELD_DECL nodes that GNU C++ may put here.  */
+	    if (TREE_CODE (tem) == FIELD_DECL
+		&& DECL_NAME (tem) != 0
+		&& TREE_CODE (DECL_SIZE (tem)) == INTEGER_CST
+		&& TREE_CODE (DECL_FIELD_BITPOS (tem)) == INTEGER_CST)
+	      {
+		char *name;
+
+		CONTIN;
+		name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (tem));
+		PUT_SDB_DEF (name);
+		if (DECL_BIT_FIELD_TYPE (tem))
+		  {
+		    PUT_SDB_INT_VAL (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem)));
+		    PUT_SDB_SCL (C_FIELD);
+		    sdbout_type (DECL_BIT_FIELD_TYPE (tem));
+		    PUT_SDB_SIZE (TREE_INT_CST_LOW (DECL_SIZE (tem)));
+		  }
+		else
+		  {
+		    PUT_SDB_INT_VAL (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem))
+				     / BITS_PER_UNIT);
+		    PUT_SDB_SCL (member_scl);
+		    sdbout_type (TREE_TYPE (tem));
+		  }
+		PUT_SDB_ENDEF;
+	      }
+	/* output end of a structure,union, or enumeral definition */
+
+	PUT_SDB_PLAIN_DEF ("eos");
+	PUT_SDB_INT_VAL (size);
+	PUT_SDB_SCL (C_EOS);
+	PUT_SDB_TAG (KNOWN_TYPE_TAG (type));
+	PUT_SDB_SIZE (size);
+	PUT_SDB_ENDEF;
+	break;
+
+      default:
+	break;
+      }
+    }
+}
+
+/* The following two functions output definitions of function parameters.
+   Each parameter gets a definition locating it in the parameter list.
+   Each parameter that is a register variable gets a second definition
+   locating it in the register.
+
+   Printing or argument lists in gdb uses the definitions that
+   locate in the parameter list.  But reference to the variable in
+   expressions uses preferentially the definition as a register.  */
+
+/* Output definitions, referring to storage in the parmlist,
+   of all the parms in PARMS, which is a chain of PARM_DECL nodes.  */
+
+static void
+sdbout_parms (parms)
+     tree parms;
+{
+  for (; parms; parms = TREE_CHAIN (parms))
+    if (DECL_NAME (parms))
+      {
+	int current_sym_value = 0;
+	char *name = IDENTIFIER_POINTER (DECL_NAME (parms));
+
+	if (name == 0 || *name == 0)
+	  name = gen_fake_label ();
+
+	/* 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);
+	DECL_RTL (parms) = eliminate_regs (DECL_RTL (parms), 0, NULL_RTX);
+
+	if (PARM_PASSED_IN_MEMORY (parms))
+	  {
+	    rtx addr = XEXP (DECL_INCOMING_RTL (parms), 0);
+	    tree type;
+
+	    /* ??? 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;
+
+	    if (GET_CODE (DECL_RTL (parms)) == REG
+		&& REGNO (DECL_RTL (parms)) >= 0
+		&& REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
+	      type = DECL_ARG_TYPE (parms);
+	    else
+	      {
+		int original_sym_value = current_sym_value;
+
+		/* This is the case where the parm is passed as an int or
+		   double and it is converted to a char, short or float
+		   and stored back in the parmlist.  In this case, describe
+		   the parm with the variable's declared type, and adjust
+		   the address if the least significant bytes (which we are
+		   using) are not the first ones.  */
+		if (BYTES_BIG_ENDIAN
+		    && TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
+		  current_sym_value +=
+		    (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
+		     - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
+
+		if (GET_CODE (DECL_RTL (parms)) == MEM
+		    && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
+		    && (GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1))
+			== CONST_INT)
+		    && (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1))
+			== current_sym_value))
+		  type = TREE_TYPE (parms);
+		else
+		  {
+		    current_sym_value = original_sym_value;
+		    type = DECL_ARG_TYPE (parms);
+		  }
+	      }
+
+	    PUT_SDB_DEF (name);
+	    PUT_SDB_INT_VAL (DEBUGGER_ARG_OFFSET (current_sym_value, addr));
+	    PUT_SDB_SCL (C_ARG);
+	    PUT_SDB_TYPE (plain_type (type));
+	    PUT_SDB_ENDEF;
+	  }
+	else if (GET_CODE (DECL_RTL (parms)) == REG)
+	  {
+	    rtx best_rtl;
+	    /* Parm passed in registers and lives in registers or nowhere.  */
+
+	    /* If parm lives in a register, use that register;
+	       pretend the parm was passed there.  It would be more consistent
+	       to describe the register where the parm was passed,
+	       but in practice that register usually holds something else.  */
+	    if (REGNO (DECL_RTL (parms)) >= 0
+		&& REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
+	      best_rtl = DECL_RTL (parms);
+	    /* If the parm lives nowhere,
+	       use the register where it was passed.  */
+	    else
+	      best_rtl = DECL_INCOMING_RTL (parms);
+
+	    PUT_SDB_DEF (name);
+	    PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (best_rtl)));
+	    PUT_SDB_SCL (C_REGPARM);
+	    PUT_SDB_TYPE (plain_type (TREE_TYPE (parms)));
+	    PUT_SDB_ENDEF;
+	  }
+	else if (GET_CODE (DECL_RTL (parms)) == MEM
+		 && XEXP (DECL_RTL (parms), 0) != const0_rtx)
+	  {
+	    /* Parm was passed in registers but lives on the stack.  */
+
+	    /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))),
+	       in which case we want the value of that CONST_INT,
+	       or (MEM (REG ...)) or (MEM (MEM ...)),
+	       in which case we use a value of zero.  */
+	    if (GET_CODE (XEXP (DECL_RTL (parms), 0)) == REG
+		|| GET_CODE (XEXP (DECL_RTL (parms), 0)) == MEM)
+	      current_sym_value = 0;
+	    else
+	      current_sym_value = INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1));
+
+	    /* Again, this assumes the offset is based on the arg pointer.  */
+	    PUT_SDB_DEF (name);
+	    PUT_SDB_INT_VAL (DEBUGGER_ARG_OFFSET (current_sym_value,
+						  XEXP (DECL_RTL (parms), 0)));
+	    PUT_SDB_SCL (C_ARG);
+	    PUT_SDB_TYPE (plain_type (TREE_TYPE (parms)));
+	    PUT_SDB_ENDEF;
+	  }
+      }
+}
+
+/* Output definitions for the places where parms live during the function,
+   when different from where they were passed, when the parms were passed
+   in memory.
+
+   It is not useful to do this for parms passed in registers
+   that live during the function in different registers, because it is
+   impossible to look in the passed register for the passed value,
+   so we use the within-the-function register to begin with.
+
+   PARMS is a chain of PARM_DECL nodes.  */
+
+static void
+sdbout_reg_parms (parms)
+     tree parms;
+{
+  for (; parms; parms = TREE_CHAIN (parms))
+    if (DECL_NAME (parms))
+      {
+	char *name = IDENTIFIER_POINTER (DECL_NAME (parms));
+
+	/* Report parms that live in registers during the function
+	   but were passed in memory.  */
+	if (GET_CODE (DECL_RTL (parms)) == REG
+	    && REGNO (DECL_RTL (parms)) >= 0
+	    && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER
+	    && PARM_PASSED_IN_MEMORY (parms))
+	  {
+	    if (name == 0 || *name == 0)
+	      name = gen_fake_label ();
+	    PUT_SDB_DEF (name);
+	    PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (DECL_RTL (parms))));
+	    PUT_SDB_SCL (C_REG);
+	    PUT_SDB_TYPE (plain_type (TREE_TYPE (parms)));
+	    PUT_SDB_ENDEF;
+	  }
+	/* Report parms that live in memory but not where they were passed.  */
+	else if (GET_CODE (DECL_RTL (parms)) == MEM
+		 && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
+		 && GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == CONST_INT
+		 && PARM_PASSED_IN_MEMORY (parms)
+		 && ! rtx_equal_p (DECL_RTL (parms), DECL_INCOMING_RTL (parms)))
+	  {
+#if 0 /* ??? It is not clear yet what should replace this.  */
+	    int offset = DECL_OFFSET (parms) / BITS_PER_UNIT;
+	    /* A parm declared char is really passed as an int,
+	       so it occupies the least significant bytes.
+	       On a big-endian machine those are not the low-numbered ones.  */
+	    if (BYTES_BIG_ENDIAN
+		&& offset != -1
+		&& TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
+	      offset += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
+			 - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
+	    if (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) != offset) {...}
+#endif
+	      {
+		if (name == 0 || *name == 0)
+		  name = gen_fake_label ();
+		PUT_SDB_DEF (name);
+		PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET
+				 (XEXP (DECL_RTL (parms), 0)));
+		PUT_SDB_SCL (C_AUTO);
+		PUT_SDB_TYPE (plain_type (TREE_TYPE (parms)));
+		PUT_SDB_ENDEF;
+	      }
+	  }
+      }
+}
+
+/* Describe the beginning of an internal block within a function.
+   Also output descriptions of variables defined in this block.
+
+   N is the number of the block, by order of beginning, counting from 1,
+   and not counting the outermost (function top-level) block.
+   The blocks match the BLOCKs in DECL_INITIAL (current_function_decl),
+   if the count starts at 0 for the outermost one.  */
+
+void
+sdbout_begin_block (file, line, n)
+     FILE *file;
+     int line;
+     int n;
+{
+  tree decl = current_function_decl;
+  MAKE_LINE_SAFE (line);
+
+  /* The SCO compiler does not emit a separate block for the function level
+     scope, so we avoid it here also.  However, mips ECOFF compilers do emit
+     a separate block, so we retain it when MIPS_DEBUGGING_INFO is defined.  */
+#ifndef MIPS_DEBUGGING_INFO
+  if (n != 1)
+#endif
+    PUT_SDB_BLOCK_START (line - sdb_begin_function_line);
+
+  if (n == 1)
+    {
+      /* Include the outermost BLOCK's variables in block 1.  */
+      next_block_number = 0;
+      do_block = 0;
+      sdbout_block (DECL_INITIAL (decl));
+    }
+  /* If -g1, suppress all the internal symbols of functions
+     except for arguments.  */
+  if (debug_info_level != DINFO_LEVEL_TERSE)
+    {
+      next_block_number = 0;
+      do_block = n;
+      sdbout_block (DECL_INITIAL (decl));
+    }
+
+#ifdef SDB_ALLOW_FORWARD_REFERENCES
+  sdbout_dequeue_anonymous_types ();
+#endif
+}
+
+/* Describe the end line-number of an internal block within a function.  */
+
+void
+sdbout_end_block (file, line, n)
+     FILE *file;
+     int line;
+     int n;
+{
+  MAKE_LINE_SAFE (line);
+
+  /* The SCO compiler does not emit a separate block for the function level
+     scope, so we avoid it here also.  However, mips ECOFF compilers do emit
+     a separate block, so we retain it when MIPS_DEBUGGING_INFO is defined.  */
+#ifndef MIPS_DEBUGGING_INFO
+  if (n != 1)
+#endif
+  PUT_SDB_BLOCK_END (line - sdb_begin_function_line);
+}
+
+/* Output sdb info for the current function name.
+   Called from assemble_start_function.  */
+
+void
+sdbout_mark_begin_function ()
+{
+  sdbout_symbol (current_function_decl, 0);
+}
+
+/* Called at beginning of function body (after prologue).
+   Record the function's starting line number, so we can output
+   relative line numbers for the other lines.
+   Describe beginning of outermost block.
+   Also describe the parameter list.  */
+
+void
+sdbout_begin_function (line)
+     int line;
+{
+  sdb_begin_function_line = line - 1;
+  PUT_SDB_FUNCTION_START (line);
+  sdbout_parms (DECL_ARGUMENTS (current_function_decl));
+  sdbout_reg_parms (DECL_ARGUMENTS (current_function_decl));
+}
+
+/* Called at end of function (before epilogue).
+   Describe end of outermost block.  */
+
+void
+sdbout_end_function (line)
+     int line;
+{
+#ifdef SDB_ALLOW_FORWARD_REFERENCES
+  sdbout_dequeue_anonymous_types ();
+#endif
+
+  MAKE_LINE_SAFE (line);
+  PUT_SDB_FUNCTION_END (line - sdb_begin_function_line);
+
+  /* Indicate we are between functions, for line-number output.  */
+  sdb_begin_function_line = -1;
+}
+
+/* Output sdb info for the absolute end of a function.
+   Called after the epilogue is output.  */
+
+void
+sdbout_end_epilogue ()
+{
+  char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
+  PUT_SDB_EPILOGUE_END (name);
+}
+
+/* Output sdb info for the given label.  Called only if LABEL_NAME (insn)
+   is present.  */
+
+void
+sdbout_label (insn)
+     register rtx insn;
+{
+  PUT_SDB_DEF (LABEL_NAME (insn));
+  PUT_SDB_VAL (insn);
+  PUT_SDB_SCL (C_LABEL);
+  PUT_SDB_TYPE (T_NULL);
+  PUT_SDB_ENDEF;
+}
+
+/* Change to reading from a new source file.  */
+
+void
+sdbout_start_new_source_file (filename)
+     char *filename;
+{
+#ifdef MIPS_DEBUGGING_INFO
+  struct sdb_file *n = (struct sdb_file *) xmalloc (sizeof *n);
+
+  n->next = current_file;
+  n->name = filename;
+  current_file = n;
+  PUT_SDB_SRC_FILE (filename);
+#endif
+}
+
+/* Revert to reading a previous source file.  */
+
+void
+sdbout_resume_previous_source_file ()
+{
+#ifdef MIPS_DEBUGGING_INFO
+  struct sdb_file *next;
+
+  next = current_file->next;
+  free (current_file);
+  current_file = next;
+  PUT_SDB_SRC_FILE (current_file->name);
+#endif
+}
+
+#endif /* SDB_DEBUGGING_INFO */