Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 1818 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/vmsdbgout.c b/gcc-4.9/gcc/vmsdbgout.c
new file mode 100644
index 000000000..3ee44bfd5
--- /dev/null
+++ b/gcc-4.9/gcc/vmsdbgout.c
@@ -0,0 +1,1818 @@
+/* Output VMS debug format symbol table information from GCC.
+   Copyright (C) 1987-2014 Free Software Foundation, Inc.
+   Contributed by Douglas B. Rupp (rupp@gnat.com).
+   Updated by Bernard W. Giroud (bgiroud@users.sourceforge.net).
+
+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 3, 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 COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+
+#ifdef VMS_DEBUGGING_INFO
+#include "tree.h"
+#include "varasm.h"
+#include "version.h"
+#include "flags.h"
+#include "rtl.h"
+#include "output.h"
+#include "vmsdbg.h"
+#include "debug.h"
+#include "langhooks.h"
+#include "function.h"
+#include "target.h"
+
+/* Difference in seconds between the VMS Epoch and the Unix Epoch */
+static const long long vms_epoch_offset = 3506716800ll;
+
+int vms_file_stats_name (const char *, long long *, long *, char *, int *);
+
+/* NOTE: In the comments in this file, many references are made to "Debug
+   Symbol Table".  This term is abbreviated as `DST' throughout the remainder
+   of this file.  */
+
+typedef struct dst_line_info_struct *dst_line_info_ref;
+
+/* Each entry in the line_info_table maintains the file and
+   line number associated with the label generated for that
+   entry.  The label gives the PC value associated with
+   the line number entry.  */
+typedef struct dst_line_info_struct
+{
+  unsigned long dst_file_num;
+  unsigned long dst_line_num;
+}
+dst_line_info_entry;
+
+typedef struct dst_file_info_struct *dst_file_info_ref;
+
+typedef struct dst_file_info_struct
+{
+  char *file_name;
+  unsigned int max_line;
+  unsigned int listing_line_start;
+  long long cdt;
+  long ebk;
+  short ffb;
+  char rfo;
+}
+dst_file_info_entry;
+
+/* Maximum size (in bytes) of an artificially generated label.  */
+#define MAX_ARTIFICIAL_LABEL_BYTES	30
+
+/* Make sure we know the sizes of the various types debug can describe. These
+   are only defaults.  If the sizes are different for your target, you should
+   override these values by defining the appropriate symbols in your tm.h
+   file.  */
+#ifndef PTR_SIZE
+#define PTR_SIZE 4 /* Must be 32 bits for VMS debug info */
+#endif
+
+/* Pointer to a structure of filenames referenced by this compilation unit.  */
+static dst_file_info_ref file_info_table;
+
+/* Total number of entries in the table (i.e. array) pointed to by
+   `file_info_table'.  This is the *total* and includes both used and unused
+   slots.  */
+static unsigned int file_info_table_allocated;
+
+/* Number of entries in the file_info_table which are actually in use.  */
+static unsigned int file_info_table_in_use;
+
+/* Size (in elements) of increments by which we may expand the filename
+   table.  */
+#define FILE_TABLE_INCREMENT 64
+
+typedef char *char_p;
+
+static vec<char_p> funcnam_table;
+static vec<unsigned> funcnum_table;
+#define FUNC_TABLE_INITIAL 256
+
+/* Local pointer to the name of the main input file.  Initialized in
+   vmsdbgout_init.  */
+static const char *primary_filename;
+
+static char *module_producer;
+static unsigned int module_language;
+
+/* A pointer to the base of a table that contains line information
+   for each source code line in .text in the compilation unit.  */
+static dst_line_info_ref line_info_table;
+
+/* Number of elements currently allocated for line_info_table.  */
+static unsigned int line_info_table_allocated;
+
+/* Number of elements in line_info_table currently in use.  */
+static unsigned int line_info_table_in_use;
+
+/* Size (in elements) of increments by which we may expand line_info_table.  */
+#define LINE_INFO_TABLE_INCREMENT 1024
+
+/* Forward declarations for functions defined in this file.  */
+static char *full_name (const char *);
+static unsigned int lookup_filename (const char *);
+static int write_debug_header (DST_HEADER *, const char *, int);
+static int write_debug_addr (const char *, const char *, int);
+static int write_debug_data1 (unsigned int, const char *, int);
+static int write_debug_data2 (unsigned int, const char *, int);
+static int write_debug_data4 (unsigned long, const char *, int);
+static int write_debug_data8 (unsigned long long, const char *, int);
+static int write_debug_delta4 (const char *, const char *, const char *, int);
+static int write_debug_string (const char *, const char *, int);
+static int write_modbeg (int);
+static int write_modend (int);
+static int write_rtnbeg (int, int);
+static int write_rtnend (int, int);
+static int write_pclines (int);
+static int write_srccorr (int, dst_file_info_entry, int);
+static int write_srccorrs (int);
+
+static void vmsdbgout_init (const char *);
+static void vmsdbgout_finish (const char *);
+static void vmsdbgout_assembly_start (void);
+static void vmsdbgout_define (unsigned int, const char *);
+static void vmsdbgout_undef (unsigned int, const char *);
+static void vmsdbgout_start_source_file (unsigned int, const char *);
+static void vmsdbgout_end_source_file (unsigned int);
+static void vmsdbgout_begin_block (unsigned int, unsigned int);
+static void vmsdbgout_end_block (unsigned int, unsigned int);
+static bool vmsdbgout_ignore_block (const_tree);
+static void vmsdbgout_source_line (unsigned int, const char *, int, bool);
+static void vmsdbgout_write_source_line (unsigned, const char *, int , bool);
+static void vmsdbgout_begin_prologue (unsigned int, const char *);
+static void vmsdbgout_end_prologue (unsigned int, const char *);
+static void vmsdbgout_end_function (unsigned int);
+static void vmsdbgout_begin_epilogue (unsigned int, const char *);
+static void vmsdbgout_end_epilogue (unsigned int, const char *);
+static void vmsdbgout_begin_function (tree);
+static void vmsdbgout_decl (tree);
+static void vmsdbgout_global_decl (tree);
+static void vmsdbgout_type_decl (tree, int);
+static void vmsdbgout_abstract_function (tree);
+
+/* The debug hooks structure.  */
+
+const struct gcc_debug_hooks vmsdbg_debug_hooks
+= {vmsdbgout_init,
+   vmsdbgout_finish,
+   vmsdbgout_assembly_start,
+   vmsdbgout_define,
+   vmsdbgout_undef,
+   vmsdbgout_start_source_file,
+   vmsdbgout_end_source_file,
+   vmsdbgout_begin_block,
+   vmsdbgout_end_block,
+   vmsdbgout_ignore_block,
+   vmsdbgout_source_line,
+   vmsdbgout_begin_prologue,
+   vmsdbgout_end_prologue,
+   vmsdbgout_begin_epilogue,
+   vmsdbgout_end_epilogue,
+   vmsdbgout_begin_function,
+   vmsdbgout_end_function,
+   vmsdbgout_decl,
+   vmsdbgout_global_decl,
+   vmsdbgout_type_decl,		  /* type_decl */
+   debug_nothing_tree_tree_tree_bool, /* imported_module_or_decl */
+   debug_nothing_tree,		  /* deferred_inline_function */
+   vmsdbgout_abstract_function,
+   debug_nothing_rtx,		  /* label */
+   debug_nothing_int,		  /* handle_pch */
+   debug_nothing_rtx,		  /* var_location */
+   debug_nothing_void,            /* switch_text_section */
+   debug_nothing_tree_tree,	  /* set_name */
+   0,                             /* start_end_main_source_file */
+   TYPE_SYMTAB_IS_ADDRESS         /* tree_type_symtab_field */
+};
+
+/* Definitions of defaults for assembler-dependent names of various
+   pseudo-ops and section names.  */
+#define VMS_UNALIGNED_SHORT_ASM_OP	".word"
+#define VMS_UNALIGNED_INT_ASM_OP	".long"
+#define VMS_UNALIGNED_LONG_ASM_OP	".long"
+#define VMS_UNALIGNED_DOUBLE_INT_ASM_OP	".quad"
+
+#define VMS_ASM_BYTE_OP	".byte"
+
+#define NUMBYTES(I) ((I) < 256 ? 1 : (I) < 65536 ? 2 : 4)
+
+#define NUMBYTES0(I) ((I) < 128 ? 0 : (I) < 65536 ? 2 : 4)
+
+#ifndef UNALIGNED_PTR_ASM_OP
+#define UNALIGNED_PTR_ASM_OP \
+  (PTR_SIZE == 8 ? VMS_UNALIGNED_DOUBLE_INT_ASM_OP : VMS_UNALIGNED_INT_ASM_OP)
+#endif
+
+#ifndef UNALIGNED_OFFSET_ASM_OP
+#define UNALIGNED_OFFSET_ASM_OP(OFFSET) \
+  (NUMBYTES (OFFSET) == 4 \
+   ? VMS_UNALIGNED_LONG_ASM_OP \
+   : (NUMBYTES (OFFSET) == 2 ? VMS_UNALIGNED_SHORT_ASM_OP : VMS_ASM_BYTE_OP))
+#endif
+
+/* Definitions of defaults for formats and names of various special
+   (artificial) labels which may be generated within this file (when the -g
+   options is used and VMS_DEBUGGING_INFO is in effect.  If necessary, these
+   may be overridden from within the tm.h file, but typically, overriding these
+   defaults is unnecessary.  */
+
+static char text_end_label[MAX_ARTIFICIAL_LABEL_BYTES];
+
+#ifndef TEXT_END_LABEL
+#define TEXT_END_LABEL		"Lvetext"
+#endif
+#ifndef FUNC_BEGIN_LABEL
+#define FUNC_BEGIN_LABEL	"LVFB"
+#endif
+#ifndef FUNC_PROLOG_LABEL
+#define FUNC_PROLOG_LABEL	"LVFP"
+#endif
+#ifndef FUNC_EPILOG_LABEL
+#define FUNC_EPILOG_LABEL	"LVEB"
+#endif
+#ifndef FUNC_END_LABEL
+#define FUNC_END_LABEL		"LVFE"
+#endif
+#ifndef BLOCK_BEGIN_LABEL
+#define BLOCK_BEGIN_LABEL	"LVBB"
+#endif
+#ifndef BLOCK_END_LABEL
+#define BLOCK_END_LABEL		"LVBE"
+#endif
+#ifndef LINE_CODE_LABEL
+#define LINE_CODE_LABEL		"LVM"
+#endif
+
+#ifndef ASM_OUTPUT_DEBUG_DELTA2
+#define ASM_OUTPUT_DEBUG_DELTA2(FILE,LABEL1,LABEL2)			 \
+  do									 \
+    {									 \
+      fprintf ((FILE), "\t%s\t", VMS_UNALIGNED_SHORT_ASM_OP);		 \
+      assemble_name (FILE, LABEL1);					 \
+      fprintf (FILE, "-");						 \
+      assemble_name (FILE, LABEL2);					 \
+    }									 \
+  while (0)
+#endif
+
+#ifndef ASM_OUTPUT_DEBUG_DELTA4
+#define ASM_OUTPUT_DEBUG_DELTA4(FILE,LABEL1,LABEL2)			 \
+  do									 \
+    {									 \
+      fprintf ((FILE), "\t%s\t", VMS_UNALIGNED_INT_ASM_OP);		 \
+      assemble_name (FILE, LABEL1);					 \
+      fprintf (FILE, "-");						 \
+      assemble_name (FILE, LABEL2);					 \
+    }									 \
+  while (0)
+#endif
+
+#ifndef ASM_OUTPUT_DEBUG_ADDR_DELTA
+#define ASM_OUTPUT_DEBUG_ADDR_DELTA(FILE,LABEL1,LABEL2)			 \
+  do									 \
+    {									 \
+      fprintf ((FILE), "\t%s\t", UNALIGNED_PTR_ASM_OP);			 \
+      assemble_name (FILE, LABEL1);					 \
+      fprintf (FILE, "-");						 \
+      assemble_name (FILE, LABEL2);					 \
+    }									 \
+  while (0)
+#endif
+
+#ifndef ASM_OUTPUT_DEBUG_ADDR
+#define ASM_OUTPUT_DEBUG_ADDR(FILE,LABEL)				 \
+  do									 \
+    {									 \
+      fprintf ((FILE), "\t%s\t", UNALIGNED_PTR_ASM_OP);			 \
+      assemble_name (FILE, LABEL);					 \
+    }									 \
+  while (0)
+#endif
+
+#ifndef ASM_OUTPUT_DEBUG_ADDR_CONST
+#define ASM_OUTPUT_DEBUG_ADDR_CONST(FILE,ADDR)				\
+  fprintf ((FILE), "\t%s\t%s", UNALIGNED_PTR_ASM_OP, (ADDR))
+#endif
+
+#ifndef ASM_OUTPUT_DEBUG_DATA1
+#define ASM_OUTPUT_DEBUG_DATA1(FILE,VALUE) \
+  fprintf ((FILE), "\t%s\t%#x", VMS_ASM_BYTE_OP, (unsigned char) VALUE)
+#endif
+
+#ifndef ASM_OUTPUT_DEBUG_DATA2
+#define ASM_OUTPUT_DEBUG_DATA2(FILE,VALUE) \
+  fprintf ((FILE), "\t%s\t%#x", VMS_UNALIGNED_SHORT_ASM_OP, \
+	   (unsigned short) VALUE)
+#endif
+
+#ifndef ASM_OUTPUT_DEBUG_DATA4
+#define ASM_OUTPUT_DEBUG_DATA4(FILE,VALUE) \
+  fprintf ((FILE), "\t%s\t%#lx", VMS_UNALIGNED_INT_ASM_OP, \
+	   (unsigned long) VALUE)
+#endif
+
+#ifndef ASM_OUTPUT_DEBUG_DATA
+#define ASM_OUTPUT_DEBUG_DATA(FILE,VALUE) \
+  fprintf ((FILE), "\t%s\t%#lx", UNALIGNED_OFFSET_ASM_OP (VALUE), VALUE)
+#endif
+
+#ifndef ASM_OUTPUT_DEBUG_ADDR_DATA
+#define ASM_OUTPUT_DEBUG_ADDR_DATA(FILE,VALUE) \
+  fprintf ((FILE), "\t%s\t%#lx", UNALIGNED_PTR_ASM_OP, \
+	   (unsigned long) VALUE)
+#endif
+
+#ifndef ASM_OUTPUT_DEBUG_DATA8
+#define ASM_OUTPUT_DEBUG_DATA8(FILE,VALUE) \
+  fprintf ((FILE), "\t%s\t%#llx", VMS_UNALIGNED_DOUBLE_INT_ASM_OP, \
+                                 (unsigned long long) VALUE)
+#endif
+
+/* This is similar to the default ASM_OUTPUT_ASCII, except that no trailing
+   newline is produced.  When flag_verbose_asm is asserted, we add commentary
+   at the end of the line, so we must avoid output of a newline here.  */
+#ifndef ASM_OUTPUT_DEBUG_STRING
+#define ASM_OUTPUT_DEBUG_STRING(FILE,P)		\
+  do						\
+    {						\
+      register int slen = strlen (P);		\
+      register const char *p = (P);		\
+      register int i;				\
+      fprintf (FILE, "\t.ascii \"");		\
+      for (i = 0; i < slen; i++)		\
+	{					\
+	  register int c = p[i];		\
+	  if (c == '\"' || c == '\\')		\
+	    putc ('\\', FILE);			\
+	  if (c >= ' ' && c < 0177)		\
+	    putc (c, FILE);			\
+	  else					\
+	    fprintf (FILE, "\\%o", c);		\
+	}					\
+      fprintf (FILE, "\"");			\
+    }						\
+  while (0)
+#endif
+
+/* Convert a reference to the assembler name of a C-level name.  This
+   macro has the same effect as ASM_OUTPUT_LABELREF, but copies to
+   a string rather than writing to a file.  */
+#ifndef ASM_NAME_TO_STRING
+#define ASM_NAME_TO_STRING(STR, NAME)		\
+  do						\
+    {						\
+      if ((NAME)[0] == '*')			\
+	strcpy (STR, NAME+1);			\
+      else					\
+	strcpy (STR, NAME);			\
+    }						\
+  while (0)
+#endif
+
+
+/* Output the debug header HEADER.  Also output COMMENT if flag_verbose_asm is
+   set.  Return the header size.  Just return the size if DOSIZEONLY is
+   nonzero.  */
+
+static int
+write_debug_header (DST_HEADER *header, const char *comment, int dosizeonly)
+{
+  if (!dosizeonly)
+    {
+      ASM_OUTPUT_DEBUG_DATA2 (asm_out_file,
+			      header->dst__header_length.dst_w_length);
+
+      if (flag_verbose_asm)
+	fprintf (asm_out_file, "\t%s record length", ASM_COMMENT_START);
+      fputc ('\n', asm_out_file);
+
+      ASM_OUTPUT_DEBUG_DATA2 (asm_out_file,
+			      header->dst__header_type.dst_w_type);
+
+      if (flag_verbose_asm)
+	fprintf (asm_out_file, "\t%s record type (%s)", ASM_COMMENT_START,
+		 comment);
+
+      fputc ('\n', asm_out_file);
+    }
+
+  return 4;
+}
+
+/* Output the address of SYMBOL.  Also output COMMENT if flag_verbose_asm is
+   set.  Return the address size.  Just return the size if DOSIZEONLY is
+   nonzero.  */
+
+static int
+write_debug_addr (const char *symbol, const char *comment, int dosizeonly)
+{
+  if (!dosizeonly)
+    {
+      ASM_OUTPUT_DEBUG_ADDR (asm_out_file, symbol);
+      if (flag_verbose_asm)
+	fprintf (asm_out_file, "\t%s %s", ASM_COMMENT_START, comment);
+      fputc ('\n', asm_out_file);
+    }
+
+  return PTR_SIZE;
+}
+
+/* Output the single byte DATA1.  Also output COMMENT if flag_verbose_asm is
+   set.  Return the data size.  Just return the size if DOSIZEONLY is
+   nonzero.  */
+
+static int
+write_debug_data1 (unsigned int data1, const char *comment, int dosizeonly)
+{
+  if (!dosizeonly)
+    {
+      ASM_OUTPUT_DEBUG_DATA1 (asm_out_file, data1);
+      if (flag_verbose_asm)
+	fprintf (asm_out_file, "\t%s %s", ASM_COMMENT_START, comment);
+      fputc ('\n', asm_out_file);
+    }
+
+  return 1;
+}
+
+/* Output the single word DATA2.  Also output COMMENT if flag_verbose_asm is
+   set.  Return the data size.  Just return the size if DOSIZEONLY is
+   nonzero.  */
+
+static int
+write_debug_data2 (unsigned int data2, const char *comment, int dosizeonly)
+{
+  if (!dosizeonly)
+    {
+      ASM_OUTPUT_DEBUG_DATA2 (asm_out_file, data2);
+      if (flag_verbose_asm)
+	fprintf (asm_out_file, "\t%s %s", ASM_COMMENT_START, comment);
+      fputc ('\n', asm_out_file);
+    }
+
+  return 2;
+}
+
+/* Output double word DATA4.  Also output COMMENT if flag_verbose_asm is set.
+   Return the data size.  Just return the size if DOSIZEONLY is nonzero.  */
+
+static int
+write_debug_data4 (unsigned long data4, const char *comment, int dosizeonly)
+{
+  if (!dosizeonly)
+    {
+      ASM_OUTPUT_DEBUG_DATA4 (asm_out_file, data4);
+      if (flag_verbose_asm)
+	fprintf (asm_out_file, "\t%s %s", ASM_COMMENT_START, comment);
+      fputc ('\n', asm_out_file);
+    }
+
+  return 4;
+}
+
+/* Output quad word DATA8.  Also output COMMENT if flag_verbose_asm is set.
+   Return the data size.  Just return the size if DOSIZEONLY is nonzero.  */
+
+static int
+write_debug_data8 (unsigned long long data8, const char *comment,
+		   int dosizeonly)
+{
+  if (!dosizeonly)
+    {
+      ASM_OUTPUT_DEBUG_DATA8 (asm_out_file, data8);
+      if (flag_verbose_asm)
+	fprintf (asm_out_file, "\t%s %s", ASM_COMMENT_START, comment);
+      fputc ('\n', asm_out_file);
+    }
+
+  return 8;
+}
+
+/* Output the difference between LABEL1 and LABEL2.  Also output COMMENT if
+   flag_verbose_asm is set.  Return the data size.  Just return the size if
+   DOSIZEONLY is nonzero.  */
+
+static int
+write_debug_delta4 (const char *label1, const char *label2,
+		    const char *comment, int dosizeonly)
+{
+  if (!dosizeonly)
+    {
+      ASM_OUTPUT_DEBUG_DELTA4 (asm_out_file, label1, label2);
+      if (flag_verbose_asm)
+	fprintf (asm_out_file, "\t%s %s", ASM_COMMENT_START, comment);
+      fputc ('\n', asm_out_file);
+    }
+
+  return 4;
+}
+
+/* Output a character string STRING.  Also write COMMENT if flag_verbose_asm is
+   set.  Return the string length.  Just return the length if DOSIZEONLY is
+   nonzero.  */
+
+static int
+write_debug_string (const char *string, const char *comment, int dosizeonly)
+{
+  if (!dosizeonly)
+    {
+      ASM_OUTPUT_DEBUG_STRING (asm_out_file, string);
+      if (flag_verbose_asm)
+	fprintf (asm_out_file, "\t%s %s", ASM_COMMENT_START, comment);
+      fputc ('\n', asm_out_file);
+    }
+
+  return strlen (string);
+}
+
+/* Output a module begin header and return the header size.  Just return the
+   size if DOSIZEONLY is nonzero.  */
+
+static int
+write_modbeg (int dosizeonly)
+{
+  DST_MODULE_BEGIN modbeg;
+  DST_MB_TRLR mb_trlr;
+  int i;
+  char *module_name, *m;
+  int modnamelen;
+  int prodnamelen;
+  int totsize = 0;
+
+  /* Assumes primary filename has Unix syntax file spec.  */
+  module_name = xstrdup (lbasename (primary_filename));
+
+  m = strrchr (module_name, '.');
+  if (m)
+    *m = 0;
+
+  modnamelen = strlen (module_name);
+  for (i = 0; i < modnamelen; i++)
+    module_name[i] = TOUPPER (module_name[i]);
+
+  prodnamelen = strlen (module_producer);
+
+  modbeg.dst_a_modbeg_header.dst__header_length.dst_w_length
+    = DST_K_MODBEG_SIZE + modnamelen + DST_K_MB_TRLR_SIZE + prodnamelen - 1;
+  modbeg.dst_a_modbeg_header.dst__header_type.dst_w_type = DST_K_MODBEG;
+  modbeg.dst_b_modbeg_flags.dst_v_modbeg_hide = 0;
+  modbeg.dst_b_modbeg_flags.dst_v_modbeg_version = 1;
+  modbeg.dst_b_modbeg_flags.dst_v_modbeg_unused = 0;
+  modbeg.dst_b_modbeg_unused = 0;
+  modbeg.dst_l_modbeg_language = (DST_LANGUAGE) module_language;
+  modbeg.dst_w_version_major = DST_K_VERSION_MAJOR;
+  modbeg.dst_w_version_minor = DST_K_VERSION_MINOR;
+  modbeg.dst_b_modbeg_name = strlen (module_name);
+
+  mb_trlr.dst_b_compiler = strlen (module_producer);
+
+  totsize += write_debug_header (&modbeg.dst_a_modbeg_header,
+				 "modbeg", dosizeonly);
+  totsize += write_debug_data1 (*((char *) &modbeg.dst_b_modbeg_flags),
+				"flags", dosizeonly);
+  totsize += write_debug_data1 (modbeg.dst_b_modbeg_unused,
+				"unused", dosizeonly);
+  totsize += write_debug_data4 (modbeg.dst_l_modbeg_language,
+				"language", dosizeonly);
+  totsize += write_debug_data2 (modbeg.dst_w_version_major,
+				"DST major version", dosizeonly);
+  totsize += write_debug_data2 (modbeg.dst_w_version_minor,
+				"DST minor version", dosizeonly);
+  totsize += write_debug_data1 (modbeg.dst_b_modbeg_name,
+				"length of module name", dosizeonly);
+  totsize += write_debug_string (module_name, "module name", dosizeonly);
+  totsize += write_debug_data1 (mb_trlr.dst_b_compiler,
+				"length of compiler name", dosizeonly);
+  totsize += write_debug_string (module_producer, "compiler name", dosizeonly);
+
+  return totsize;
+}
+
+/* Output a module end trailer and return the trailer size.   Just return
+   the size if DOSIZEONLY is nonzero.  */
+
+static int
+write_modend (int dosizeonly)
+{
+  DST_MODULE_END modend;
+  int totsize = 0;
+
+  modend.dst_a_modend_header.dst__header_length.dst_w_length
+   = DST_K_MODEND_SIZE - 1;
+  modend.dst_a_modend_header.dst__header_type.dst_w_type = DST_K_MODEND;
+
+  totsize += write_debug_header (&modend.dst_a_modend_header, "modend",
+				 dosizeonly);
+
+  return totsize;
+}
+
+/* Output a routine begin header routine RTNNUM and return the header size.
+   Just return the size if DOSIZEONLY is nonzero.  */
+
+static int
+write_rtnbeg (int rtnnum, int dosizeonly)
+{
+  const char *rtnname;
+  int rtnnamelen;
+  char *rtnentryname;
+  int totsize = 0;
+  char label[MAX_ARTIFICIAL_LABEL_BYTES];
+  DST_ROUTINE_BEGIN rtnbeg;
+  DST_PROLOG prolog;
+
+  rtnname = funcnam_table[rtnnum];
+  rtnnamelen = strlen (rtnname);
+  rtnentryname = concat (rtnname, "..en", NULL);
+
+  if (!strcmp (rtnname, "main"))
+    {
+      DST_HEADER header;
+      const char *go = "TRANSFER$BREAK$GO";
+
+      /* This command isn't documented in DSTRECORDS, so it's made to
+	 look like what DEC C does */
+
+      /* header size - 1st byte + flag byte + STO_LW size
+	 + string count byte + string length */
+      header.dst__header_length.dst_w_length
+	= DST_K_DST_HEADER_SIZE - 1 + 1 + 4 + 1 + strlen (go);
+      header.dst__header_type.dst_w_type = DST_K_TBG;
+
+      totsize += write_debug_header (&header, "transfer", dosizeonly);
+
+      /* I think this is a flag byte, but I don't know what this flag means */
+      totsize += write_debug_data1 (0x1, "flags ???", dosizeonly);
+
+      /* Routine Begin PD Address */
+      totsize += write_debug_addr (rtnname, "main procedure descriptor",
+				   dosizeonly);
+      totsize += write_debug_data1 (strlen (go), "length of main_name",
+				    dosizeonly);
+      totsize += write_debug_string (go, "main name", dosizeonly);
+    }
+
+  /* The header length never includes the length byte.  */
+  rtnbeg.dst_a_rtnbeg_header.dst__header_length.dst_w_length
+   = DST_K_RTNBEG_SIZE + rtnnamelen - 1;
+  rtnbeg.dst_a_rtnbeg_header.dst__header_type.dst_w_type = DST_K_RTNBEG;
+  rtnbeg.dst_b_rtnbeg_flags.dst_v_rtnbeg_unused = 0;
+  rtnbeg.dst_b_rtnbeg_flags.dst_v_rtnbeg_unalloc = 0;
+  rtnbeg.dst_b_rtnbeg_flags.dst_v_rtnbeg_prototype = 0;
+  rtnbeg.dst_b_rtnbeg_flags.dst_v_rtnbeg_inlined = 0;
+  rtnbeg.dst_b_rtnbeg_flags.dst_v_rtnbeg_no_call = 1;
+  rtnbeg.dst_b_rtnbeg_name = rtnnamelen;
+
+  totsize += write_debug_header (&rtnbeg.dst_a_rtnbeg_header, "rtnbeg",
+				 dosizeonly);
+  totsize += write_debug_data1 (*((char *) &rtnbeg.dst_b_rtnbeg_flags),
+				"flags", dosizeonly);
+
+  /* Routine Begin Address */
+  totsize += write_debug_addr (rtnentryname, "routine entry name", dosizeonly);
+
+  /* Routine Begin PD Address */
+  totsize += write_debug_addr (rtnname, "routine procedure descriptor",
+			       dosizeonly);
+
+  /* Routine Begin Name */
+  totsize += write_debug_data1 (rtnbeg.dst_b_rtnbeg_name,
+				"length of routine name", dosizeonly);
+
+  totsize += write_debug_string (rtnname, "routine name", dosizeonly);
+
+  free (rtnentryname);
+
+  if (debug_info_level > DINFO_LEVEL_TERSE)
+    {
+      prolog.dst_a_prolog_header.dst__header_length.dst_w_length
+	= DST_K_PROLOG_SIZE - 1;
+      prolog.dst_a_prolog_header.dst__header_type.dst_w_type = DST_K_PROLOG;
+
+      totsize += write_debug_header (&prolog.dst_a_prolog_header, "prolog",
+				     dosizeonly);
+
+      ASM_GENERATE_INTERNAL_LABEL
+        (label, FUNC_PROLOG_LABEL,
+	 funcnum_table[rtnnum]);
+      totsize += write_debug_addr (label, "prolog breakpoint addr",
+				   dosizeonly);
+    }
+
+  return totsize;
+}
+
+/* Output a routine end trailer for routine RTNNUM and return the header size.
+   Just return the size if DOSIZEONLY is nonzero.  */
+
+static int
+write_rtnend (int rtnnum, int dosizeonly)
+{
+  DST_ROUTINE_END rtnend;
+  char label1[MAX_ARTIFICIAL_LABEL_BYTES];
+  char label2[MAX_ARTIFICIAL_LABEL_BYTES];
+  int totsize;
+
+  totsize = 0;
+
+  rtnend.dst_a_rtnend_header.dst__header_length.dst_w_length
+   = DST_K_RTNEND_SIZE - 1;
+  rtnend.dst_a_rtnend_header.dst__header_type.dst_w_type = DST_K_RTNEND;
+  rtnend.dst_b_rtnend_unused = 0;
+  rtnend.dst_l_rtnend_size = 0; /* Calculated below.  */
+
+  totsize += write_debug_header (&rtnend.dst_a_rtnend_header, "rtnend",
+				 dosizeonly);
+  totsize += write_debug_data1 (rtnend.dst_b_rtnend_unused, "unused",
+				dosizeonly);
+
+  ASM_GENERATE_INTERNAL_LABEL
+   (label1, FUNC_BEGIN_LABEL,
+    funcnum_table[rtnnum]);
+  ASM_GENERATE_INTERNAL_LABEL
+   (label2, FUNC_END_LABEL,
+    funcnum_table[rtnnum]);
+  totsize += write_debug_delta4 (label2, label1, "routine size", dosizeonly);
+
+  return totsize;
+}
+
+#define K_DELTA_PC(I) \
+ ((I) < 128 ? -(I) : (I) < 65536 ? DST_K_DELTA_PC_W : DST_K_DELTA_PC_L)
+
+#define K_SET_LINUM(I) \
+ ((I) < 256 ? DST_K_SET_LINUM_B \
+  : (I) < 65536 ? DST_K_SET_LINUM : DST_K_SET_LINUM_L)
+
+#define K_INCR_LINUM(I) \
+ ((I) < 256 ? DST_K_INCR_LINUM \
+  : (I) < 65536 ? DST_K_INCR_LINUM_W : DST_K_INCR_LINUM_L)
+
+/* Output the PC to line number correlations and return the size.  Just return
+   the size if DOSIZEONLY is nonzero */
+
+static int
+write_pclines (int dosizeonly)
+{
+  unsigned i;
+  int fn;
+  int ln, lastln;
+  int linestart = 0;
+  int max_line;
+  DST_LINE_NUM_HEADER line_num;
+  DST_PCLINE_COMMANDS pcline;
+  char label[MAX_ARTIFICIAL_LABEL_BYTES];
+  char lastlabel[MAX_ARTIFICIAL_LABEL_BYTES];
+  int totsize = 0;
+  char buff[256];
+
+  max_line = file_info_table[1].max_line;
+  file_info_table[1].listing_line_start = linestart;
+  linestart = linestart + ((max_line / 100000) + 1) * 100000;
+
+  for (i = 2; i < file_info_table_in_use; i++)
+    {
+      max_line = file_info_table[i].max_line;
+      file_info_table[i].listing_line_start = linestart;
+      linestart = linestart + ((max_line / 10000) + 1) * 10000;
+    }
+
+  /* Set starting address to beginning of text section.  */
+  line_num.dst_a_line_num_header.dst__header_length.dst_w_length = 8;
+  line_num.dst_a_line_num_header.dst__header_type.dst_w_type = DST_K_LINE_NUM;
+  pcline.dst_b_pcline_command = DST_K_SET_ABS_PC;
+
+  totsize += write_debug_header (&line_num.dst_a_line_num_header,
+				 "line_num", dosizeonly);
+  totsize += write_debug_data1 (pcline.dst_b_pcline_command,
+				"line_num (SET ABS PC)", dosizeonly);
+
+  if (dosizeonly)
+    totsize += 4;
+  else
+    {
+      ASM_OUTPUT_DEBUG_ADDR (asm_out_file, TEXT_SECTION_ASM_OP);
+      if (flag_verbose_asm)
+	fprintf (asm_out_file, "\t%s line_num", ASM_COMMENT_START);
+      fputc ('\n', asm_out_file);
+    }
+
+  fn = line_info_table[1].dst_file_num;
+  ln = (file_info_table[fn].listing_line_start
+	+ line_info_table[1].dst_line_num);
+  line_num.dst_a_line_num_header.dst__header_length.dst_w_length = 4 + 4;
+  pcline.dst_b_pcline_command = DST_K_SET_LINUM_L;
+
+  totsize += write_debug_header (&line_num.dst_a_line_num_header,
+				 "line_num", dosizeonly);
+  totsize += write_debug_data1 (pcline.dst_b_pcline_command,
+				"line_num (SET LINUM LONG)", dosizeonly);
+
+  sprintf (buff, "line_num (%d)", ln ? ln - 1 : 0);
+  totsize += write_debug_data4 (ln ? ln - 1 : 0, buff, dosizeonly);
+
+  lastln = ln;
+  strcpy (lastlabel, TEXT_SECTION_ASM_OP);
+  for (i = 1; i < line_info_table_in_use; i++)
+    {
+      int extrabytes;
+
+      fn = line_info_table[i].dst_file_num;
+      ln = (file_info_table[fn].listing_line_start
+	    + line_info_table[i].dst_line_num);
+
+      if (ln - lastln > 1)
+	extrabytes = 5; /* NUMBYTES (ln - lastln - 1) + 1; */
+      else if (ln <= lastln)
+	extrabytes = 5; /* NUMBYTES (ln - 1) + 1; */
+      else
+	extrabytes = 0;
+
+      line_num.dst_a_line_num_header.dst__header_length.dst_w_length
+	= 8 + extrabytes;
+
+      totsize += write_debug_header
+	(&line_num.dst_a_line_num_header, "line_num", dosizeonly);
+
+      if (ln - lastln > 1)
+	{
+	  int lndif = ln - lastln - 1;
+
+	  /* K_INCR_LINUM (lndif); */
+	  pcline.dst_b_pcline_command = DST_K_INCR_LINUM_L;
+
+	  totsize += write_debug_data1 (pcline.dst_b_pcline_command,
+					"line_num (INCR LINUM LONG)",
+					dosizeonly);
+
+	  sprintf (buff, "line_num (%d)", lndif);
+	  totsize += write_debug_data4 (lndif, buff, dosizeonly);
+	}
+      else if (ln <= lastln)
+	{
+	  /* K_SET_LINUM (ln-1); */
+	  pcline.dst_b_pcline_command = DST_K_SET_LINUM_L;
+
+	  totsize += write_debug_data1 (pcline.dst_b_pcline_command,
+					"line_num (SET LINUM LONG)",
+					dosizeonly);
+
+	  sprintf (buff, "line_num (%d)", ln - 1);
+	  totsize += write_debug_data4 (ln - 1, buff, dosizeonly);
+	}
+
+      pcline.dst_b_pcline_command = DST_K_DELTA_PC_L;
+
+      totsize += write_debug_data1 (pcline.dst_b_pcline_command,
+				    "line_num (DELTA PC LONG)", dosizeonly);
+
+      ASM_GENERATE_INTERNAL_LABEL (label, LINE_CODE_LABEL, i);
+      totsize += write_debug_delta4 (label, lastlabel, "increment line_num",
+				     dosizeonly);
+
+      lastln = ln;
+      strcpy (lastlabel, label);
+    }
+
+  return totsize;
+}
+
+/* Output a source correlation for file FILEID using information saved in
+   FILE_INFO_ENTRY and return the size.  Just return the size if DOSIZEONLY is
+   nonzero.  */
+
+static int
+write_srccorr (int fileid, dst_file_info_entry file_info_entry,
+	       int dosizeonly)
+{
+  int src_command_size;
+  int linesleft = file_info_entry.max_line;
+  int linestart = file_info_entry.listing_line_start;
+  int flen = strlen (file_info_entry.file_name);
+  int linestodo = 0;
+  DST_SOURCE_CORR src_header;
+  DST_SRC_COMMAND src_command;
+  DST_SRC_COMMAND src_command_sf;
+  DST_SRC_COMMAND src_command_sl;
+  DST_SRC_COMMAND src_command_sr;
+  DST_SRC_COMMAND src_command_dl;
+  DST_SRC_CMDTRLR src_cmdtrlr;
+  char buff[256];
+  int totsize = 0;
+
+  if (fileid == 1)
+    {
+      src_header.dst_a_source_corr_header.dst__header_length.dst_w_length
+	= DST_K_SOURCE_CORR_HEADER_SIZE + 1 - 1;
+      src_header.dst_a_source_corr_header.dst__header_type.dst_w_type
+	= DST_K_SOURCE;
+      src_command.dst_b_src_command = DST_K_SRC_FORMFEED;
+
+      totsize += write_debug_header (&src_header.dst_a_source_corr_header,
+				     "source corr", dosizeonly);
+
+      totsize += write_debug_data1 (src_command.dst_b_src_command,
+				    "source_corr (SRC FORMFEED)",
+				    dosizeonly);
+    }
+
+  src_command_size
+    = DST_K_SRC_COMMAND_SIZE + flen + DST_K_SRC_CMDTRLR_SIZE;
+  src_command.dst_b_src_command = DST_K_SRC_DECLFILE;
+  src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_b_src_df_length
+    = src_command_size - 2;
+  src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_b_src_df_flags = 0;
+  src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_w_src_df_fileid
+    = fileid;
+  src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_q_src_df_rms_cdt
+    = file_info_entry.cdt;
+  src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_l_src_df_rms_ebk
+    = file_info_entry.ebk;
+  src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_w_src_df_rms_ffb
+    = file_info_entry.ffb;
+  src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_b_src_df_rms_rfo
+    = file_info_entry.rfo;
+  src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_b_src_df_filename
+    = flen;
+
+  src_header.dst_a_source_corr_header.dst__header_length.dst_w_length
+    = DST_K_SOURCE_CORR_HEADER_SIZE + src_command_size - 1;
+  src_header.dst_a_source_corr_header.dst__header_type.dst_w_type
+    = DST_K_SOURCE;
+
+  src_cmdtrlr.dst_b_src_df_libmodname = 0;
+
+  totsize += write_debug_header (&src_header.dst_a_source_corr_header,
+				 "source corr", dosizeonly);
+  totsize += write_debug_data1 (src_command.dst_b_src_command,
+				"source_corr (DECL SRC FILE)", dosizeonly);
+  totsize += write_debug_data1
+    (src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_b_src_df_length,
+     "source_corr (length)", dosizeonly);
+
+  totsize += write_debug_data1
+    (src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_b_src_df_flags,
+     "source_corr (flags)", dosizeonly);
+
+  totsize += write_debug_data2
+    (src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_w_src_df_fileid,
+     "source_corr (fileid)", dosizeonly);
+
+  totsize += write_debug_data8
+    (src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_q_src_df_rms_cdt,
+     "source_corr (creation date)", dosizeonly);
+
+  totsize += write_debug_data4
+    (src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_l_src_df_rms_ebk,
+     "source_corr (EOF block number)", dosizeonly);
+
+  totsize += write_debug_data2
+    (src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_w_src_df_rms_ffb,
+     "source_corr (first free byte)", dosizeonly);
+
+  totsize += write_debug_data1
+    (src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_b_src_df_rms_rfo,
+     "source_corr (record and file organization)", dosizeonly);
+
+  totsize += write_debug_data1
+    (src_command.dst_a_src_cmd_fields.dst_a_src_decl_src.dst_b_src_df_filename,
+     "source_corr (filename length)", dosizeonly);
+
+  totsize += write_debug_string (remap_debug_filename (
+				    file_info_entry.file_name),
+				 "source file name", dosizeonly);
+  totsize += write_debug_data1 (src_cmdtrlr.dst_b_src_df_libmodname,
+				"source_corr (libmodname)", dosizeonly);
+
+  src_command_sf.dst_b_src_command = DST_K_SRC_SETFILE;
+  src_command_sf.dst_a_src_cmd_fields.dst_w_src_unsword = fileid;
+
+  src_command_sr.dst_b_src_command = DST_K_SRC_SETREC_W;
+  src_command_sr.dst_a_src_cmd_fields.dst_w_src_unsword = 1;
+
+  src_command_sl.dst_b_src_command = DST_K_SRC_SETLNUM_L;
+  src_command_sl.dst_a_src_cmd_fields.dst_l_src_unslong = linestart + 1;
+
+  src_command_dl.dst_b_src_command = DST_K_SRC_DEFLINES_W;
+
+  if (linesleft > 65534)
+    linesleft = linesleft - 65534, linestodo = 65534;
+  else
+    linestodo = linesleft, linesleft = 0;
+
+  src_command_dl.dst_a_src_cmd_fields.dst_w_src_unsword = linestodo;
+
+  src_header.dst_a_source_corr_header.dst__header_length.dst_w_length
+    = DST_K_SOURCE_CORR_HEADER_SIZE + 3 + 3 + 5 + 3 - 1;
+  src_header.dst_a_source_corr_header.dst__header_type.dst_w_type
+    = DST_K_SOURCE;
+
+  if (src_command_dl.dst_a_src_cmd_fields.dst_w_src_unsword)
+    {
+      totsize += write_debug_header (&src_header.dst_a_source_corr_header,
+				     "source corr", dosizeonly);
+
+      totsize += write_debug_data1 (src_command_sf.dst_b_src_command,
+				    "source_corr (src setfile)", dosizeonly);
+
+      totsize += write_debug_data2
+	(src_command_sf.dst_a_src_cmd_fields.dst_w_src_unsword,
+	 "source_corr (fileid)", dosizeonly);
+
+      totsize += write_debug_data1 (src_command_sr.dst_b_src_command,
+				    "source_corr (setrec)", dosizeonly);
+
+      totsize += write_debug_data2
+	(src_command_sr.dst_a_src_cmd_fields.dst_w_src_unsword,
+	 "source_corr (recnum)", dosizeonly);
+
+      totsize += write_debug_data1 (src_command_sl.dst_b_src_command,
+				    "source_corr (setlnum)", dosizeonly);
+
+      totsize += write_debug_data4
+	(src_command_sl.dst_a_src_cmd_fields.dst_l_src_unslong,
+	 "source_corr (linenum)", dosizeonly);
+
+      totsize += write_debug_data1 (src_command_dl.dst_b_src_command,
+				    "source_corr (deflines)", dosizeonly);
+
+      sprintf (buff, "source_corr (%d)",
+	       src_command_dl.dst_a_src_cmd_fields.dst_w_src_unsword);
+      totsize += write_debug_data2
+	(src_command_dl.dst_a_src_cmd_fields.dst_w_src_unsword,
+	 buff, dosizeonly);
+
+      while (linesleft > 0)
+	{
+	  src_header.dst_a_source_corr_header.dst__header_length.dst_w_length
+	    = DST_K_SOURCE_CORR_HEADER_SIZE + 3 - 1;
+	  src_header.dst_a_source_corr_header.dst__header_type.dst_w_type
+	    = DST_K_SOURCE;
+	  src_command_dl.dst_b_src_command = DST_K_SRC_DEFLINES_W;
+
+	  if (linesleft > 65534)
+	    linesleft = linesleft - 65534, linestodo = 65534;
+	  else
+	    linestodo = linesleft, linesleft = 0;
+
+	  src_command_dl.dst_a_src_cmd_fields.dst_w_src_unsword = linestodo;
+
+	  totsize += write_debug_header (&src_header.dst_a_source_corr_header,
+					 "source corr", dosizeonly);
+	  totsize += write_debug_data1 (src_command_dl.dst_b_src_command,
+					"source_corr (deflines)", dosizeonly);
+	  sprintf (buff, "source_corr (%d)",
+		   src_command_dl.dst_a_src_cmd_fields.dst_w_src_unsword);
+	  totsize += write_debug_data2
+	    (src_command_dl.dst_a_src_cmd_fields.dst_w_src_unsword,
+	     buff, dosizeonly);
+	}
+    }
+
+  return totsize;
+}
+
+/* Output all the source correlation entries and return the size.  Just return
+   the size if DOSIZEONLY is nonzero.  */
+
+static int
+write_srccorrs (int dosizeonly)
+{
+  unsigned int i;
+  int totsize = 0;
+
+  for (i = 1; i < file_info_table_in_use; i++)
+    totsize += write_srccorr (i, file_info_table[i], dosizeonly);
+
+  return totsize;
+}
+
+/* Output a marker (i.e. a label) for the beginning of a function, before
+   the prologue.  */
+
+static void
+vmsdbgout_begin_prologue (unsigned int line, const char *file)
+{
+  char label[MAX_ARTIFICIAL_LABEL_BYTES];
+
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.begin_prologue) (line, file);
+
+  if (debug_info_level > DINFO_LEVEL_NONE)
+    {
+      ASM_GENERATE_INTERNAL_LABEL (label, FUNC_BEGIN_LABEL,
+				   current_function_funcdef_no);
+      ASM_OUTPUT_LABEL (asm_out_file, label);
+    }
+}
+
+/* Output a marker (i.e. a label) for the beginning of a function, after
+   the prologue.  */
+
+static void
+vmsdbgout_end_prologue (unsigned int line, const char *file)
+{
+  char label[MAX_ARTIFICIAL_LABEL_BYTES];
+
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.end_prologue) (line, file);
+
+  if (debug_info_level > DINFO_LEVEL_TERSE)
+    {
+      ASM_GENERATE_INTERNAL_LABEL (label, FUNC_PROLOG_LABEL,
+				   current_function_funcdef_no);
+      ASM_OUTPUT_LABEL (asm_out_file, label);
+
+      /* VMS PCA expects every PC range to correlate to some line and file.  */
+      vmsdbgout_write_source_line (line, file, 0, true);
+    }
+}
+
+/* No output for VMS debug, but make obligatory call to Dwarf2 debug */
+
+static void
+vmsdbgout_end_function (unsigned int line)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.end_function) (line);
+}
+
+/* Output a marker (i.e. a label) for the beginning of the epilogue.
+   This gets called *before* the epilogue code has been generated.  */
+
+static void
+vmsdbgout_begin_epilogue (unsigned int line, const char *file)
+{
+  char label[MAX_ARTIFICIAL_LABEL_BYTES];
+  static int save_current_function_funcdef_no = -1;
+
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.begin_epilogue) (line, file);
+
+  if (debug_info_level > DINFO_LEVEL_NONE)
+    {
+      if (save_current_function_funcdef_no != current_function_funcdef_no)
+	{
+	  /* Output a label to mark the endpoint of the code generated for this
+	     function.  */
+	  ASM_GENERATE_INTERNAL_LABEL (label, FUNC_EPILOG_LABEL,
+				       current_function_funcdef_no);
+
+	  ASM_OUTPUT_LABEL (asm_out_file, label);
+
+	  save_current_function_funcdef_no = current_function_funcdef_no;
+
+	  /* VMS PCA expects every PC range to correlate to some line and
+	     file.  */
+	  vmsdbgout_write_source_line (line, file, 0, true);
+	}
+    }
+}
+
+/* Output a marker (i.e. a label) for the absolute end of the generated code
+   for a function definition.  This gets called *after* the epilogue code has
+   been generated.  */
+
+static void
+vmsdbgout_end_epilogue (unsigned int line, const char *file)
+{
+  char label[MAX_ARTIFICIAL_LABEL_BYTES];
+
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.end_epilogue) (line, file);
+
+  if (debug_info_level > DINFO_LEVEL_NONE)
+    {
+      /* Output a label to mark the endpoint of the code generated for this
+         function.  */
+      ASM_GENERATE_INTERNAL_LABEL (label, FUNC_END_LABEL,
+				   current_function_funcdef_no);
+      ASM_OUTPUT_LABEL (asm_out_file, label);
+
+      /* VMS PCA expects every PC range to correlate to some line and file.  */
+      vmsdbgout_write_source_line (line, file, 0, true);
+    }
+}
+
+/* Output a marker (i.e. a label) for the beginning of the generated code for
+   a lexical block.  */
+
+static void
+vmsdbgout_begin_block (register unsigned line, register unsigned blocknum)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.begin_block) (line, blocknum);
+
+  if (debug_info_level > DINFO_LEVEL_TERSE)
+    targetm.asm_out.internal_label (asm_out_file, BLOCK_BEGIN_LABEL, blocknum);
+}
+
+/* Output a marker (i.e. a label) for the end of the generated code for a
+   lexical block.  */
+
+static void
+vmsdbgout_end_block (register unsigned line, register unsigned blocknum)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.end_block) (line, blocknum);
+
+  if (debug_info_level > DINFO_LEVEL_TERSE)
+    targetm.asm_out.internal_label (asm_out_file, BLOCK_END_LABEL, blocknum);
+}
+
+/* Not implemented in VMS Debug.  */
+
+static bool
+vmsdbgout_ignore_block (const_tree block)
+{
+  bool retval = 0;
+
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    retval = (*dwarf2_debug_hooks.ignore_block) (block);
+
+  return retval;
+}
+
+/* Add an entry for function DECL into the funcnam_table.  */
+
+static void
+vmsdbgout_begin_function (tree decl)
+{
+  const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
+
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.begin_function) (decl);
+
+  /* Add the new entry to the end of the function name table.  */
+  funcnam_table.safe_push (xstrdup (name));
+  funcnum_table.safe_push (current_function_funcdef_no);
+}
+
+static char fullname_buff [4096];
+
+/* Return the full file specification for FILENAME.  The specification must be
+   in VMS syntax in order to be processed by VMS Debug.  */
+
+static char *
+full_name (const char *filename)
+{
+#ifdef VMS
+  FILE *fp = fopen (filename, "r");
+
+  fgetname (fp, fullname_buff, 1);
+  fclose (fp);
+#else
+  /* Unix paths really mess up VMS debug. Better to just output the
+     base filename.  */
+  strcpy (fullname_buff, filename);
+#endif
+
+  return fullname_buff;
+}
+
+/* Lookup a filename (in the list of filenames that we know about here in
+   vmsdbgout.c) and return its "index".  The index of each (known) filename is
+   just a unique number which is associated with only that one filename.  We
+   need such numbers for the sake of generating labels  and references
+   to those files numbers.  If the filename given as an argument is not
+   found in our current list, add it to the list and assign it the next
+   available unique index number.  In order to speed up searches, we remember
+   the index of the filename was looked up last.  This handles the majority of
+   all searches.  */
+
+static unsigned int
+lookup_filename (const char *file_name)
+{
+  static unsigned int last_file_lookup_index = 0;
+  register char *fn;
+  register unsigned i;
+  const char *fnam;
+  long long cdt = 0;
+  long ebk = 0;
+  short ffb = 0;
+  char rfo = 0;
+  long siz = 0;
+  int ver = 0;
+
+  fnam = full_name (file_name);
+
+  /* Check to see if the file name that was searched on the previous call
+     matches this file name. If so, return the index.  */
+  if (last_file_lookup_index != 0)
+    {
+      fn = file_info_table[last_file_lookup_index].file_name;
+      if (strcmp (fnam, fn) == 0)
+	return last_file_lookup_index;
+    }
+
+  /* Didn't match the previous lookup, search the table */
+  for (i = 1; i < file_info_table_in_use; ++i)
+    {
+      fn = file_info_table[i].file_name;
+      if (strcmp (fnam, fn) == 0)
+	{
+	  last_file_lookup_index = i;
+	  return i;
+	}
+    }
+
+  /* Prepare to add a new table entry by making sure there is enough space in
+     the table to do so.  If not, expand the current table.  */
+  if (file_info_table_in_use == file_info_table_allocated)
+    {
+
+      file_info_table_allocated += FILE_TABLE_INCREMENT;
+      file_info_table = XRESIZEVEC (dst_file_info_entry, file_info_table,
+				    file_info_table_allocated);
+    }
+
+  if (vms_file_stats_name (file_name, &cdt, &siz, &rfo, &ver) == 0)
+    {
+      ebk = siz / 512 + 1;
+      ffb = siz - ((siz / 512) * 512);
+    }
+
+  /* Add the new entry to the end of the filename table.  */
+  file_info_table[file_info_table_in_use].file_name = xstrdup (fnam);
+  file_info_table[file_info_table_in_use].max_line = 0;
+  file_info_table[file_info_table_in_use].cdt = cdt;
+  file_info_table[file_info_table_in_use].ebk = ebk;
+  file_info_table[file_info_table_in_use].ffb = ffb;
+  file_info_table[file_info_table_in_use].rfo = rfo;
+
+  last_file_lookup_index = file_info_table_in_use++;
+  return last_file_lookup_index;
+}
+
+/* Output a label to mark the beginning of a source code line entry
+   and record information relating to this source line, in
+   'line_info_table' for later output of the .debug_line section.  */
+
+static void
+vmsdbgout_write_source_line (unsigned line, const char *filename,
+                             int /* discriminator */, bool /* is_stmt */)
+{
+  dst_line_info_ref line_info;
+
+  targetm.asm_out.internal_label (asm_out_file, LINE_CODE_LABEL,
+                                  line_info_table_in_use);
+
+  /* Expand the line info table if necessary.  */
+  if (line_info_table_in_use == line_info_table_allocated)
+    {
+      line_info_table_allocated += LINE_INFO_TABLE_INCREMENT;
+      line_info_table = XRESIZEVEC (dst_line_info_entry, line_info_table,
+                                    line_info_table_allocated);
+    }
+
+  /* Add the new entry at the end of the line_info_table.  */
+  line_info = &line_info_table[line_info_table_in_use++];
+  line_info->dst_file_num = lookup_filename (filename);
+  line_info->dst_line_num = line;
+  if (line > file_info_table[line_info->dst_file_num].max_line)
+    file_info_table[line_info->dst_file_num].max_line = line;
+}
+
+static void
+vmsdbgout_source_line (register unsigned line, register const char *filename,
+                       int discriminator, bool is_stmt)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.source_line) (line, filename, discriminator, is_stmt);
+
+  if (debug_info_level >= DINFO_LEVEL_TERSE)
+    vmsdbgout_write_source_line (line, filename, discriminator, is_stmt);
+}
+
+/* Record the beginning of a new source file, for later output.
+   At present, unimplemented.  */
+
+static void
+vmsdbgout_start_source_file (unsigned int lineno, const char *filename)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.start_source_file) (lineno, filename);
+}
+
+/* Record the end of a source file, for later output.
+   At present, unimplemented.  */
+
+static void
+vmsdbgout_end_source_file (unsigned int lineno ATTRIBUTE_UNUSED)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.end_source_file) (lineno);
+}
+
+/* Set up for Debug output at the start of compilation.  */
+
+static void
+vmsdbgout_init (const char *filename)
+{
+  const char *language_string = lang_hooks.name;
+
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.init) (filename);
+
+  if (debug_info_level == DINFO_LEVEL_NONE)
+    return;
+
+  /* Remember the name of the primary input file.  */
+  primary_filename = filename;
+
+  /* Allocate the initial hunk of the file_info_table.  */
+  file_info_table = XCNEWVEC (dst_file_info_entry, FILE_TABLE_INCREMENT);
+  file_info_table_allocated = FILE_TABLE_INCREMENT;
+  /* Skip the first entry - file numbers begin at 1.  */
+  file_info_table_in_use = 1;
+
+  funcnam_table.create (FUNC_TABLE_INITIAL);
+  funcnum_table.create (FUNC_TABLE_INITIAL);
+
+  /* Allocate the initial hunk of the line_info_table.  */
+  line_info_table = XCNEWVEC (dst_line_info_entry, LINE_INFO_TABLE_INCREMENT);
+  line_info_table_allocated = LINE_INFO_TABLE_INCREMENT;
+  /* zero-th entry is allocated, but unused */
+  line_info_table_in_use = 1;
+
+  lookup_filename (primary_filename);
+
+  if (!strcmp (language_string, "GNU C"))
+    module_language = DST_K_C;
+  else if (!strcmp (language_string, "GNU C++"))
+    module_language = DST_K_CXX;
+  else if (!strcmp (language_string, "GNU Ada"))
+    module_language = DST_K_ADA;
+  else if (!strcmp (language_string, "GNU F77"))
+    module_language = DST_K_FORTRAN;
+  else
+    module_language = DST_K_UNKNOWN;
+
+  module_producer = concat (language_string, " ", version_string, NULL);
+
+  ASM_GENERATE_INTERNAL_LABEL (text_end_label, TEXT_END_LABEL, 0);
+
+}
+
+/* Not implemented in VMS Debug.  */
+
+static void
+vmsdbgout_assembly_start (void)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.assembly_start) ();
+}
+
+/* Not implemented in VMS Debug.  */
+
+static void
+vmsdbgout_define (unsigned int lineno, const char *buffer)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.define) (lineno, buffer);
+}
+
+/* Not implemented in VMS Debug.  */
+
+static void
+vmsdbgout_undef (unsigned int lineno, const char *buffer)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.undef) (lineno, buffer);
+}
+
+/* Not implemented in VMS Debug.  */
+
+static void
+vmsdbgout_decl (tree decl)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.function_decl) (decl);
+}
+
+/* Not implemented in VMS Debug.  */
+
+static void
+vmsdbgout_global_decl (tree decl)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.global_decl) (decl);
+}
+
+/* Not implemented in VMS Debug.  */
+
+static void
+vmsdbgout_type_decl (tree decl, int local)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.type_decl) (decl, local);
+}
+
+/* Not implemented in VMS Debug.  */
+
+static void
+vmsdbgout_abstract_function (tree decl)
+{
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.outlining_inline_function) (decl);
+}
+
+/* Output stuff that Debug requires at the end of every file and generate the
+   VMS Debug debugging info.  */
+
+static void
+vmsdbgout_finish (const char *filename ATTRIBUTE_UNUSED)
+{
+  unsigned int i, ifunc;
+  int totsize;
+
+  if (write_symbols == VMS_AND_DWARF2_DEBUG)
+    (*dwarf2_debug_hooks.finish) (filename);
+
+  if (debug_info_level == DINFO_LEVEL_NONE)
+    return;
+
+  /* Output a terminator label for the .text section.  */
+  switch_to_section (text_section);
+  targetm.asm_out.internal_label (asm_out_file, TEXT_END_LABEL, 0);
+
+  /* Output debugging information.
+     Warning! Do not change the name of the .vmsdebug section without
+     changing it in the assembler also.  */
+  switch_to_section (get_named_section (NULL, ".vmsdebug", 0));
+  ASM_OUTPUT_ALIGN (asm_out_file, 0);
+
+  totsize = write_modbeg (1);
+  FOR_EACH_VEC_ELT (funcnum_table, i, ifunc)
+    {
+      totsize += write_rtnbeg (i, 1);
+      totsize += write_rtnend (i, 1);
+    }
+  totsize += write_pclines (1);
+
+  write_modbeg (0);
+  FOR_EACH_VEC_ELT (funcnum_table, i, ifunc)
+    {
+      write_rtnbeg (i, 0);
+      write_rtnend (i, 0);
+    }
+  write_pclines (0);
+
+  if (debug_info_level > DINFO_LEVEL_TERSE)
+    {
+      totsize = write_srccorrs (1);
+      write_srccorrs (0);
+    }
+
+  totsize = write_modend (1);
+  write_modend (0);
+}
+
+/* Need for both Dwarf2 on IVMS and VMS Debug on AVMS */
+
+#ifdef VMS
+#define __NEW_STARLET 1
+#include <vms/rms.h>
+#include <vms/atrdef.h>
+#include <vms/fibdef.h>
+#include <vms/stsdef.h>
+#include <vms/iodef.h>
+#include <vms/fatdef.h>
+#include <vms/descrip.h>
+#include <unixlib.h>
+
+#define MAXPATH 256
+
+/* descrip.h doesn't have everything ...  */
+typedef struct fibdef* __fibdef_ptr32 __attribute__ (( mode (SI) ));
+struct dsc$descriptor_fib
+{
+  unsigned int fib$l_len;
+  __fibdef_ptr32 fib$l_addr;
+};
+
+/* I/O Status Block.  */
+struct IOSB
+{
+  unsigned short status, count;
+  unsigned int devdep;
+};
+
+static char *tryfile;
+
+/* Variable length string.  */
+struct vstring
+{
+  short length;
+  char string[NAM$C_MAXRSS+1];
+};
+
+static char filename_buff [MAXPATH];
+static char vms_filespec [MAXPATH];
+
+/* Callback function for filespec style conversion.  */
+
+static int
+translate_unix (char *name, int type ATTRIBUTE_UNUSED)
+{
+  strncpy (filename_buff, name, MAXPATH);
+  filename_buff [MAXPATH - 1] = (char) 0;
+  return 0;
+}
+
+/* Wrapper for DECC function that converts a Unix filespec
+   to VMS style filespec.  */
+
+static char *
+to_vms_file_spec (char *filespec)
+{
+  strncpy (vms_filespec, "", MAXPATH);
+  decc$to_vms (filespec, translate_unix, 1, 1);
+  strncpy (vms_filespec, filename_buff, MAXPATH);
+
+  vms_filespec [MAXPATH - 1] = (char) 0;
+
+  return vms_filespec;
+}
+
+#else
+#define VMS_EPOCH_OFFSET 35067168000000000LL
+#define VMS_GRANULARITY_FACTOR 10000000
+#endif
+
+/* Return VMS file date, size, format, version given a name.  */
+
+int
+vms_file_stats_name (const char *filename, long long *cdt, long *siz, char *rfo,
+		     int *ver)
+{
+#ifdef VMS
+  struct FAB fab;
+  struct NAM nam;
+
+  unsigned long long create;
+  FAT recattr;
+  char ascnamebuff [256];
+
+  ATRDEF atrlst[]
+    = {
+      { ATR$S_CREDATE,  ATR$C_CREDATE,  &create },
+      { ATR$S_RECATTR,  ATR$C_RECATTR,  &recattr },
+      { ATR$S_ASCNAME,  ATR$C_ASCNAME,  &ascnamebuff },
+      { 0, 0, 0}
+    };
+
+  FIBDEF fib;
+  struct dsc$descriptor_fib fibdsc = {sizeof (fib), (void *) &fib};
+
+  struct IOSB iosb;
+
+  long status;
+  unsigned short chan;
+
+  struct vstring file;
+  struct dsc$descriptor_s filedsc
+    = {NAM$C_MAXRSS, DSC$K_DTYPE_T, DSC$K_CLASS_S, (void *) file.string};
+  struct vstring device;
+  struct dsc$descriptor_s devicedsc
+    = {NAM$C_MAXRSS, DSC$K_DTYPE_T, DSC$K_CLASS_S, (void *) device.string};
+  struct vstring result;
+  struct dsc$descriptor_s resultdsc
+    = {NAM$C_MAXRSS, DSC$K_DTYPE_VT, DSC$K_CLASS_VS, (void *) result.string};
+
+  if (strcmp (filename, "<internal>") == 0
+      || strcmp (filename, "<built-in>") == 0)
+    {
+      if (cdt)
+	*cdt = 0;
+
+      if (siz)
+	*siz = 0;
+
+      if (rfo)
+	*rfo = 0;
+
+      if (ver)
+        *ver = 0;
+
+      return 0;
+    }
+
+  tryfile = to_vms_file_spec (filename);
+
+  /* Allocate and initialize a FAB and NAM structures.  */
+  fab = cc$rms_fab;
+  nam = cc$rms_nam;
+
+  nam.nam$l_esa = file.string;
+  nam.nam$b_ess = NAM$C_MAXRSS;
+  nam.nam$l_rsa = result.string;
+  nam.nam$b_rss = NAM$C_MAXRSS;
+  fab.fab$l_fna = tryfile;
+  fab.fab$b_fns = strlen (tryfile);
+  fab.fab$l_nam = &nam;
+
+  /* Validate filespec syntax and device existence.  */
+  status = SYS$PARSE (&fab, 0, 0);
+  if ((status & 1) != 1)
+    return 1;
+
+  file.string[nam.nam$b_esl] = 0;
+
+  /* Find matching filespec.  */
+  status = SYS$SEARCH (&fab, 0, 0);
+  if ((status & 1) != 1)
+    return 1;
+
+  file.string[nam.nam$b_esl] = 0;
+  result.string[result.length=nam.nam$b_rsl] = 0;
+
+  /* Get the device name and assign an IO channel.  */
+  strncpy (device.string, nam.nam$l_dev, nam.nam$b_dev);
+  devicedsc.dsc$w_length  = nam.nam$b_dev;
+  chan = 0;
+  status = SYS$ASSIGN (&devicedsc, &chan, 0, 0, 0);
+  if ((status & 1) != 1)
+    return 1;
+
+  /* Initialize the FIB and fill in the directory id field.  */
+  memset (&fib, 0, sizeof (fib));
+  fib.fib$w_did[0]  = nam.nam$w_did[0];
+  fib.fib$w_did[1]  = nam.nam$w_did[1];
+  fib.fib$w_did[2]  = nam.nam$w_did[2];
+  fib.fib$l_acctl = 0;
+  fib.fib$l_wcc = 0;
+  strcpy (file.string, (strrchr (result.string, ']') + 1));
+  filedsc.dsc$w_length = strlen (file.string);
+  result.string[result.length = 0] = 0;
+
+  /* Open and close the file to fill in the attributes.  */
+  status
+    = SYS$QIOW (0, chan, IO$_ACCESS|IO$M_ACCESS, &iosb, 0, 0,
+		&fibdsc, &filedsc, &result.length, &resultdsc, &atrlst, 0);
+  if ((status & 1) != 1)
+    return 1;
+  if ((iosb.status & 1) != 1)
+    return 1;
+
+  result.string[result.length] = 0;
+  status = SYS$QIOW (0, chan, IO$_DEACCESS, &iosb, 0, 0, &fibdsc, 0, 0, 0,
+		     &atrlst, 0);
+  if ((status & 1) != 1)
+    return 1;
+  if ((iosb.status & 1) != 1)
+    return 1;
+
+  /* Deassign the channel and exit.  */
+  status = SYS$DASSGN (chan);
+  if ((status & 1) != 1)
+    return 1;
+
+  if (cdt) *cdt = create;
+  if (siz) *siz = (512 * 65536 * recattr.fat$w_efblkh) +
+                  (512 * (recattr.fat$w_efblkl - 1)) +
+                  recattr.fat$w_ffbyte;
+  if (rfo) *rfo = recattr.fat$v_rtype;
+  if (ver) *ver = strtol (strrchr (ascnamebuff, ';')+1, 0, 10);
+
+  return 0;
+#else
+  struct stat buff;
+
+  if ((stat (filename, &buff)) != 0)
+     return 1;
+
+  if (cdt)
+    *cdt = (long long) (buff.st_mtime * VMS_GRANULARITY_FACTOR)
+                        + VMS_EPOCH_OFFSET;
+
+  if (siz)
+    *siz = buff.st_size;
+
+  if (rfo)
+    *rfo = 2; /* Stream LF format */
+
+  if (ver)
+    *ver = 1;
+
+  return 0;
+#endif
+}
+#endif