This patch adds the end prologue and begin epilogue markers in Dwarf2

that are needed by the VMS debugger on I64.

	* config/ia64/vms.h (ASM_OUTPUT_DWARF_DELTA_UNITS): Remove.
	(ASM_OUTPUT_DWARF_VMS_DELTA: Define new macro.
	* dbxout.c (gcc_debug_hooks): New entry begin_epilogue.
	* debug.c: Likewise.
	* sdbout.c: Likewise.
	* vmsdbgout.c: Likewise.
	* debug.h: Likewise. (dwarf2out_vms_{begin,end}_prologue): Declare.
	* doc/tm.texi (ASM_OUTPUT_DWARF_VMS_DELTA): Document.
	* dwarf2asm.c (dw2_asm_output_vms_delta): New function.
	(ASM_OUTPUT_DWARF_VMS_DELTA): Call it.
	* dwarf2asm.h (dw2_asm_output_vms_delta): Declare.
	* dwarf2out.c (dw_fde_struct): New fields
	dw_fde_vms_{end,begin}_prologue.
	(PROLOGUE_END_LABEL, EPILOGUE_BEGIN_LABEL): New macros.
	(dwarf2out_begin_prologue): Set dw_fde_struct defaults for above.
	(dwarf2out_vms_end_prologue): New function.
	(dwarf2out_vms_begin_epilogue): New function.
	(dw_val_struct): New value dw_val_class_vms_delta.
	(gcc_debug_hooks): New entry begin_epilogue. Set end_prologue,
	begin_epilogue for VMS.
	(AT_vms_delta1, AT_vms_delta2, add_AT_vms_delta): Declare
	new static functions.
	(dwarf_attr_name): New cases DW_AT_HP_{prologue,epilogue}.
	(AT_vms_delta1, AT_vms_delta2, add_AT_vms_delta): New 
	static functions.
	(print_die): New case dw_val_class_vms_delta.
	(attr_checksum): Likewise.
	(same_dw_val_p: Likewise.
	(size_of_die): Likewise.
	(value_format): Likewise.
	(output_die): Likewise.
	(gen_subprogram_die): Call add_AT_vms_delta on VMS.
	(dwarf2out_begin_epilogue): Rename to dwarf2out_cfi_begin_epilogue
	* dwarf2out.h (dwarf2out_begin_epilogue): Rename to
	dwarf2out_cfi_begin_epilogue
	* final.c (final_scan_insn): Likewise. Call begin_epilogue.

From-SVN: r160858

13 files changed, 271 insertions, 21 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4d5dc0c..3acf2c5 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,42 @@
+2010-06-16  Douglas B Rupp  <rupp@gnat.com>
+
+	* config/ia64/vms.h (ASM_OUTPUT_DWARF_DELTA_UNITS): Remove.
+	(ASM_OUTPUT_DWARF_VMS_DELTA: Define new macro.
+	* dbxout.c (gcc_debug_hooks): New entry begin_epilogue.
+	* debug.c: Likewise.
+	* sdbout.c: Likewise.
+	* vmsdbgout.c: Likewise.
+	* debug.h: Likewise. (dwarf2out_vms_{begin,end}_prologue): Declare.
+	* doc/tm.texi (ASM_OUTPUT_DWARF_VMS_DELTA): Document.
+	* dwarf2asm.c (dw2_asm_output_vms_delta): New function.
+	(ASM_OUTPUT_DWARF_VMS_DELTA): Call it.
+	* dwarf2asm.h (dw2_asm_output_vms_delta): Declare.
+	* dwarf2out.c (dw_fde_struct): New fields
+	dw_fde_vms_{end,begin}_prologue.
+	(PROLOGUE_END_LABEL, EPILOGUE_BEGIN_LABEL): New macros.
+	(dwarf2out_begin_prologue): Set dw_fde_struct defaults for above.
+	(dwarf2out_vms_end_prologue): New function.
+	(dwarf2out_vms_begin_epilogue): New function.
+	(dw_val_struct): New value dw_val_class_vms_delta.
+	(gcc_debug_hooks): New entry begin_epilogue. Set end_prologue,
+	begin_epilogue for VMS.
+	(AT_vms_delta1, AT_vms_delta2, add_AT_vms_delta): Declare
+	new static functions.
+	(dwarf_attr_name): New cases DW_AT_HP_{prologue,epilogue}.
+	(AT_vms_delta1, AT_vms_delta2, add_AT_vms_delta): New 
+	static functions.
+	(print_die): New case dw_val_class_vms_delta.
+	(attr_checksum): Likewise.
+	(same_dw_val_p: Likewise.
+	(size_of_die): Likewise.
+	(value_format): Likewise.
+	(output_die): Likewise.
+	(gen_subprogram_die): Call add_AT_vms_delta on VMS.
+	(dwarf2out_begin_epilogue): Rename to dwarf2out_cfi_begin_epilogue
+	* dwarf2out.h (dwarf2out_begin_epilogue): Rename to
+	dwarf2out_cfi_begin_epilogue
+	* final.c (final_scan_insn): Likewise. Call begin_epilogue.
+
 2010-06-16  Nathan Froyd  <froydnj@codesourcery.com>
 
 	* config/cris/cris-protos.h (cris_print_operand): Delete.
diff --git a/gcc/config/ia64/vms.h b/gcc/config/ia64/vms.h
index 279586c..3d678ce 100644
--- a/gcc/config/ia64/vms.h
+++ b/gcc/config/ia64/vms.h
@@ -1,5 +1,5 @@
 /* Definitions of target machine GNU compiler. IA64-VMS version.
-   Copyright (C) 2003-2009 Free Software Foundation, Inc.
+   Copyright (C) 2003-2010 Free Software Foundation, Inc.
    Contributed by Douglas B Rupp (rupp@gnat.com).
 
 This file is part of GCC.
@@ -72,13 +72,13 @@ along with GCC; see the file COPYING3.  If not see
 /* Turn on VMS specific Dwarf2 features.  */
 #define VMS_DEBUGGING_INFO 1
 
-#define ASM_OUTPUT_DWARF_DELTA_UNITS(FILE,SIZE,LABEL1,LABEL2,UNITS) \
-do {                                \
-  fprintf (FILE, "\tdata4.ua\t ("); \
-  assemble_name (FILE, LABEL1);     \
-  fprintf (FILE, "-");              \
-  assemble_name (FILE, LABEL2);     \
-  fprintf (FILE, ")/16*3");         \
+#define ASM_OUTPUT_DWARF_VMS_DELTA(FILE,SIZE,LABEL1,LABEL2) \
+do {                                          \
+  fprintf (FILE, "\tdata4.ua\t@slotcount(");  \
+  assemble_name (FILE, LABEL1);               \
+  fprintf (FILE, "-");                        \
+  assemble_name (FILE, LABEL2);               \
+  fprintf (FILE, ")");                        \
 } while (0)
 
 #undef STARTFILE_SPEC
diff --git a/gcc/dbxout.c b/gcc/dbxout.c
index be1e6fd..066e91f 100644
--- a/gcc/dbxout.c
+++ b/gcc/dbxout.c
@@ -1,6 +1,6 @@
 /* Output dbx-format symbol table information from GNU compiler.
    Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -357,6 +357,7 @@ const struct gcc_debug_hooks dbx_debug_hooks =
   dbxout_source_line,		         /* source_line */
   dbxout_begin_prologue,	         /* begin_prologue */
   debug_nothing_int_charstar,	         /* end_prologue */
+  debug_nothing_int_charstar,	         /* begin_epilogue */
   debug_nothing_int_charstar,	         /* end_epilogue */
 #ifdef DBX_FUNCTION_FIRST
   dbxout_begin_function,
@@ -399,6 +400,7 @@ const struct gcc_debug_hooks xcoff_debug_hooks =
   xcoffout_source_line,
   xcoffout_begin_prologue,	         /* begin_prologue */
   debug_nothing_int_charstar,	         /* end_prologue */
+  debug_nothing_int_charstar,	         /* begin_epilogue */
   xcoffout_end_epilogue,
   debug_nothing_tree,		         /* begin_function */
   xcoffout_end_function,
diff --git a/gcc/debug.c b/gcc/debug.c
index c60a78d..c53d05e 100644
--- a/gcc/debug.c
+++ b/gcc/debug.c
@@ -1,5 +1,5 @@
 /* Do-nothing debug hooks for GCC.
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2010
    Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify it
@@ -38,6 +38,7 @@ const struct gcc_debug_hooks do_nothing_debug_hooks =
   debug_nothing_int_charstar_int_bool,	 /* source_line */
   debug_nothing_int_charstar,	         /* begin_prologue */
   debug_nothing_int_charstar,	         /* end_prologue */
+  debug_nothing_int_charstar,	         /* begin_epilogue */
   debug_nothing_int_charstar,	         /* end_epilogue */
   debug_nothing_tree,		         /* begin_function */
   debug_nothing_int,		         /* end_function */
diff --git a/gcc/debug.h b/gcc/debug.h
index 079ecb6..2ca0ad8 100644
--- a/gcc/debug.h
+++ b/gcc/debug.h
@@ -1,5 +1,5 @@
 /* Debug hooks for GCC.
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2010
    Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify it
@@ -75,6 +75,9 @@ struct gcc_debug_hooks
      function.  */
   void (* end_prologue) (unsigned int line, const char *file);
 
+  /* Called at beginning of epilogue code.  */
+  void (* begin_epilogue) (unsigned int line, const char *file);
+
   /* Record end of epilogue code.  */
   void (* end_epilogue) (unsigned int line, const char *file);
 
@@ -194,6 +197,8 @@ extern const struct gcc_debug_hooks vmsdbg_debug_hooks;
 /* Dwarf2 frame information.  */
 
 extern void dwarf2out_begin_prologue (unsigned int, const char *);
+extern void dwarf2out_vms_end_prologue (unsigned int, const char *);
+extern void dwarf2out_vms_begin_epilogue (unsigned int, const char *);
 extern void dwarf2out_end_epilogue (unsigned int, const char *);
 extern void dwarf2out_frame_init (void);
 extern void dwarf2out_frame_finish (void);
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 495bdfa..b118c65 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -9289,6 +9289,12 @@ A C statement to issue assembly directives that create a difference
 @var{lab1} minus @var{lab2}, using an integer of the given @var{size}.
 @end defmac
 
+@defmac ASM_OUTPUT_DWARF_VMS_DELTA (@var{stream}, @var{size}, @var{label1}, @var{label2})
+A C statement to issue assembly directives that create a difference
+between the two given labels in system defined units, e.g. instruction
+slots on IA64 VMS, using an integer of the given size.
+@end defmac
+
 @defmac ASM_OUTPUT_DWARF_OFFSET (@var{stream}, @var{size}, @var{label}, @var{section})
 A C statement to issue assembly directives that create a
 section-relative reference to the given @var{label}, using an integer of the
diff --git a/gcc/dwarf2asm.c b/gcc/dwarf2asm.c
index 8e16a21..84e8cad 100644
--- a/gcc/dwarf2asm.c
+++ b/gcc/dwarf2asm.c
@@ -152,6 +152,35 @@ dw2_asm_output_delta (int size, const char *lab1, const char *lab2,
   va_end (ap);
 }
 
+/* Output the difference between two symbols in instruction units
+   in a given size.  */
+
+void
+dw2_asm_output_vms_delta (int size ATTRIBUTE_UNUSED,
+			  const char *lab1, const char *lab2,
+			  const char *comment, ...)
+{
+  va_list ap;
+
+  va_start (ap, comment);
+
+#ifndef ASM_OUTPUT_DWARF_VMS_DELTA
+  /* VMS Delta is only special on ia64-vms, but this funtion also gets
+     called on alpha-vms so it has to do something sane.  */
+  dw2_asm_output_delta (size, lab1, lab2, comment);
+#else
+  ASM_OUTPUT_DWARF_VMS_DELTA (asm_out_file, size, lab1, lab2);
+  if (flag_debug_asm && comment)
+    {
+      fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
+      vfprintf (asm_out_file, comment, ap);
+    }
+  fputc ('\n', asm_out_file);
+#endif
+
+  va_end (ap);
+}
+
 /* Output a section-relative reference to a LABEL, which was placed in
    BASE.  In general this can only be done for debugging symbols.
    E.g. on most targets with the GNU linker, this is accomplished with
diff --git a/gcc/dwarf2asm.h b/gcc/dwarf2asm.h
index e7be9bd..39515d0 100644
--- a/gcc/dwarf2asm.h
+++ b/gcc/dwarf2asm.h
@@ -1,5 +1,6 @@
 /* Dwarf2 assembler output helper routines.
-   Copyright (C) 2001, 2003, 2005, 2007, 2008 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2003, 2005, 2007, 2008, 2010
+   Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -30,6 +31,10 @@ extern void dw2_asm_output_delta (int, const char *, const char *,
 				  const char *, ...)
      ATTRIBUTE_NULL_PRINTF_4;
 
+extern void dw2_asm_output_vms_delta (int, const char *, const char *,
+				      const char *, ...)
+     ATTRIBUTE_NULL_PRINTF_4;
+
 extern void dw2_asm_output_offset (int, const char *, section *,
 				   const char *, ...)
      ATTRIBUTE_NULL_PRINTF_4;
diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index e35a780..8d1dd81 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -299,6 +299,8 @@ typedef struct GTY(()) dw_fde_struct {
   const char *dw_fde_begin;
   const char *dw_fde_current_label;
   const char *dw_fde_end;
+  const char *dw_fde_vms_end_prologue;
+  const char *dw_fde_vms_begin_epilogue;
   const char *dw_fde_hot_section_label;
   const char *dw_fde_hot_section_end_label;
   const char *dw_fde_unlikely_section_label;
@@ -508,6 +510,14 @@ static void def_cfa_1 (const char *, dw_cfa_location *);
 #define FUNC_END_LABEL		"LFE"
 #endif
 
+#ifndef PROLOGUE_END_LABEL
+#define PROLOGUE_END_LABEL	"LPE"
+#endif
+
+#ifndef EPILOGUE_BEGIN_LABEL
+#define EPILOGUE_BEGIN_LABEL	"LEB"
+#endif
+
 #ifndef FRAME_BEGIN_LABEL
 #define FRAME_BEGIN_LABEL	"Lframe"
 #endif
@@ -2789,7 +2799,7 @@ dwarf2out_frame_debug (rtx insn, bool after_p)
    NOTE_INSN_CFA_RESTORE_STATE at the appropriate place in the stream.  */
 
 void
-dwarf2out_begin_epilogue (rtx insn)
+dwarf2out_cfi_begin_epilogue (rtx insn)
 {
   bool saw_frp = false;
   rtx i;
@@ -2862,7 +2872,8 @@ dwarf2out_begin_epilogue (rtx insn)
   cfa_remember.in_use = 1;
 }
 
-/* A "subroutine" of dwarf2out_begin_epilogue.  Emit the restore required.  */
+/* A "subroutine" of dwarf2out_cfi_begin_epilogue.  Emit the restore
+   required.  */
 
 void
 dwarf2out_frame_debug_restore_state (void)
@@ -3961,6 +3972,8 @@ dwarf2out_begin_prologue (unsigned int line ATTRIBUTE_UNUSED,
   fde->dw_fde_switched_sections = 0;
   fde->dw_fde_switched_cold_to_hot = 0;
   fde->dw_fde_end = NULL;
+  fde->dw_fde_vms_end_prologue = NULL;
+  fde->dw_fde_vms_begin_epilogue = NULL;
   fde->dw_fde_cfi = NULL;
   fde->dw_fde_switch_cfi = NULL;
   fde->funcdef_number = current_function_funcdef_no;
@@ -4017,6 +4030,51 @@ dwarf2out_begin_prologue (unsigned int line ATTRIBUTE_UNUSED,
     }
 }
 
+/* Output a marker (i.e. a label) for the end of the generated code
+   for a function prologue.  This gets called *after* the prologue code has
+   been generated.  */
+
+void
+dwarf2out_vms_end_prologue (unsigned int line ATTRIBUTE_UNUSED,
+			const char *file ATTRIBUTE_UNUSED)
+{
+  dw_fde_ref fde;
+  char label[MAX_ARTIFICIAL_LABEL_BYTES];
+
+  /* Output a label to mark the endpoint of the code generated for this
+     function.  */
+  ASM_GENERATE_INTERNAL_LABEL (label, PROLOGUE_END_LABEL,
+			       current_function_funcdef_no);
+  ASM_OUTPUT_DEBUG_LABEL (asm_out_file, PROLOGUE_END_LABEL,
+			  current_function_funcdef_no);
+  fde = &fde_table[fde_table_in_use - 1];
+  fde->dw_fde_vms_end_prologue = xstrdup (label);
+}
+
+/* Output a marker (i.e. a label) for the beginning of the generated code
+   for a function epilogue.  This gets called *before* the prologue code has
+   been generated.  */
+
+void
+dwarf2out_vms_begin_epilogue (unsigned int line ATTRIBUTE_UNUSED,
+			  const char *file ATTRIBUTE_UNUSED)
+{
+  dw_fde_ref fde;
+  char label[MAX_ARTIFICIAL_LABEL_BYTES];
+
+  fde = &fde_table[fde_table_in_use - 1];
+  if (fde->dw_fde_vms_begin_epilogue)
+    return;
+
+  /* Output a label to mark the endpoint of the code generated for this
+     function.  */
+  ASM_GENERATE_INTERNAL_LABEL (label, EPILOGUE_BEGIN_LABEL,
+			       current_function_funcdef_no);
+  ASM_OUTPUT_DEBUG_LABEL (asm_out_file, EPILOGUE_BEGIN_LABEL,
+			  current_function_funcdef_no);
+  fde->dw_fde_vms_begin_epilogue = xstrdup (label);
+}
+
 /* 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.  */
@@ -4193,7 +4251,8 @@ enum dw_val_class
   dw_val_class_str,
   dw_val_class_macptr,
   dw_val_class_file,
-  dw_val_class_data8
+  dw_val_class_data8,
+  dw_val_class_vms_delta
 };
 
 /* Describe a floating point constant value, or a vector constant value.  */
@@ -4231,6 +4290,11 @@ typedef struct GTY(()) dw_val_struct {
       unsigned char GTY ((tag ("dw_val_class_flag"))) val_flag;
       struct dwarf_file_data * GTY ((tag ("dw_val_class_file"))) val_file;
       unsigned char GTY ((tag ("dw_val_class_data8"))) val_data8[8];
+      struct dw_val_vms_delta_union
+	{
+	  char * lbl1;
+	  char * lbl2;
+	} GTY ((tag ("dw_val_class_vms_delta"))) val_vms_delta;
     }
   GTY ((desc ("%1.val_class"))) v;
 }
@@ -5466,7 +5530,13 @@ const struct gcc_debug_hooks dwarf2_debug_hooks =
   dwarf2out_ignore_block,
   dwarf2out_source_line,
   dwarf2out_begin_prologue,
-  debug_nothing_int_charstar,	/* end_prologue */
+#if VMS_DEBUGGING_INFO
+  dwarf2out_vms_end_prologue,
+  dwarf2out_vms_begin_epilogue,
+#else
+  debug_nothing_int_charstar,
+  debug_nothing_int_charstar,
+#endif
   dwarf2out_end_epilogue,
   dwarf2out_begin_function,
   debug_nothing_int,		/* end_function */
@@ -6230,6 +6300,10 @@ static void prune_unused_types_walk_attribs (dw_die_ref);
 static void prune_unused_types_prune (dw_die_ref);
 static void prune_unused_types (void);
 static int maybe_emit_file (struct dwarf_file_data *fd);
+static inline const char *AT_vms_delta1 (dw_attr_ref);
+static inline const char *AT_vms_delta2 (dw_attr_ref);
+static inline void add_AT_vms_delta (dw_die_ref, enum dwarf_attribute,
+				     const char *, const char *);
 static void append_entry_to_tmpl_value_parm_die_table (dw_die_ref, tree);
 static void gen_remaining_tmpl_value_param_die_attribute (void);
 
@@ -6737,14 +6811,24 @@ dwarf_attr_name (unsigned int attr)
       return "DW_AT_MIPS_tail_loop_begin";
     case DW_AT_MIPS_epilog_begin:
       return "DW_AT_MIPS_epilog_begin";
+#if VMS_DEBUGGING_INFO
+    case DW_AT_HP_prologue:
+      return "DW_AT_HP_prologue";
+#else
     case DW_AT_MIPS_loop_unroll_factor:
       return "DW_AT_MIPS_loop_unroll_factor";
+#endif
     case DW_AT_MIPS_software_pipeline_depth:
       return "DW_AT_MIPS_software_pipeline_depth";
     case DW_AT_MIPS_linkage_name:
       return "DW_AT_MIPS_linkage_name";
+#if VMS_DEBUGGING_INFO
+    case DW_AT_HP_epilogue:
+      return "DW_AT_HP_epilogue";
+#else
     case DW_AT_MIPS_stride:
       return "DW_AT_MIPS_stride";
+#endif
     case DW_AT_MIPS_abstract_name:
       return "DW_AT_MIPS_abstract_name";
     case DW_AT_MIPS_clone_origin:
@@ -7310,6 +7394,21 @@ AT_file (dw_attr_ref a)
   return a->dw_attr_val.v.val_file;
 }
 
+/* Add a vms delta attribute value to a DIE.  */
+
+static inline void
+add_AT_vms_delta (dw_die_ref die, enum dwarf_attribute attr_kind,
+		  const char *lbl1, const char *lbl2)
+{
+  dw_attr_node attr;
+
+  attr.dw_attr = attr_kind;
+  attr.dw_attr_val.val_class = dw_val_class_vms_delta;
+  attr.dw_attr_val.v.val_vms_delta.lbl1 = xstrdup (lbl1);
+  attr.dw_attr_val.v.val_vms_delta.lbl2 = xstrdup (lbl2);
+  add_dwarf_attr (die, &attr);
+}
+
 /* Add a label identifier attribute value to a DIE.  */
 
 static inline void
@@ -7381,6 +7480,24 @@ add_AT_range_list (dw_die_ref die, enum dwarf_attribute attr_kind,
   add_dwarf_attr (die, &attr);
 }
 
+/* Return the start label of a delta attribute.  */
+
+static inline const char *
+AT_vms_delta1 (dw_attr_ref a)
+{
+  gcc_assert (a && (AT_class (a) == dw_val_class_vms_delta));
+  return a->dw_attr_val.v.val_vms_delta.lbl1;
+}
+
+/* Return the end label of a delta attribute.  */
+
+static inline const char *
+AT_vms_delta2 (dw_attr_ref a)
+{
+  gcc_assert (a && (AT_class (a) == dw_val_class_vms_delta));
+  return a->dw_attr_val.v.val_vms_delta.lbl2;
+}
+
 static inline const char *
 AT_lbl (dw_attr_ref a)
 {
@@ -8178,6 +8295,10 @@ print_die (dw_die_ref die, FILE *outfile)
 	  else
 	    fprintf (outfile, "die -> <null>");
 	  break;
+	case dw_val_class_vms_delta:
+	  fprintf (outfile, "delta: @slotcount(%s-%s)",
+		   AT_vms_delta2 (a), AT_vms_delta1 (a));
+	  break;
 	case dw_val_class_lbl_id:
 	case dw_val_class_lineptr:
 	case dw_val_class_macptr:
@@ -8356,6 +8477,7 @@ attr_checksum (dw_attr_ref at, struct md5_ctx *ctx, int *mark)
       break;
 
     case dw_val_class_fde_ref:
+    case dw_val_class_vms_delta:
     case dw_val_class_lbl_id:
     case dw_val_class_lineptr:
     case dw_val_class_macptr:
@@ -9086,6 +9208,7 @@ same_dw_val_p (const dw_val_node *v1, const dw_val_node *v2, int *mark)
       return same_die_p (v1->v.val_die_ref.die, v2->v.val_die_ref.die, mark);
 
     case dw_val_class_fde_ref:
+    case dw_val_class_vms_delta:
     case dw_val_class_lbl_id:
     case dw_val_class_lineptr:
     case dw_val_class_macptr:
@@ -10267,6 +10390,9 @@ size_of_die (dw_die_ref die)
 	case dw_val_class_data8:
 	  size += 8;
 	  break;
+	case dw_val_class_vms_delta:
+	  size += DWARF_OFFSET_SIZE;
+	  break;
 	default:
 	  gcc_unreachable ();
 	}
@@ -10424,6 +10550,7 @@ value_format (dw_attr_ref a)
       if (dwarf_version >= 4)
 	return DW_FORM_sec_offset;
       /* FALLTHRU */
+    case dw_val_class_vms_delta:
     case dw_val_class_offset:
       switch (DWARF_OFFSET_SIZE)
 	{
@@ -10889,6 +11016,12 @@ output_die (dw_die_ref die)
 	  }
 	  break;
 
+	case dw_val_class_vms_delta:
+	  dw2_asm_output_vms_delta (DWARF_OFFSET_SIZE,
+				    AT_vms_delta2 (a), AT_vms_delta1 (a),
+				    "%s", name);
+	  break;
+
 	case dw_val_class_lbl_id:
 	  dw2_asm_output_addr (DWARF2_ADDR_SIZE, AT_lbl (a), "%s", name);
 	  break;
@@ -18435,6 +18568,32 @@ gen_subprogram_die (tree decl, dw_die_ref context_die)
 				       current_function_funcdef_no);
 	  add_AT_lbl_id (subr_die, DW_AT_high_pc, label_id);
 
+#if VMS_DEBUGGING_INFO
+      /* HP OpenVMS Industry Standard 64: DWARF Extensions
+	 Section 2.3 Prologue and Epilogue Attributes:
+	 When a breakpoint is set on entry to a function, it is generally
+	 desirable for execution to be suspended, not on the very first
+	 instruction of the function, but rather at a point after the
+	 function's frame has been set up, after any language defined local
+	 declaration processing has been completed, and before execution of
+	 the first statement of the function begins. Debuggers generally
+	 cannot properly determine where this point is.  Similarly for a
+	 breakpoint set on exit from a function. The prologue and epilogue
+	 attributes allow a compiler to communicate the location(s) to use.  */
+
+      {
+        dw_fde_ref fde = &fde_table[current_funcdef_fde];
+
+        if (fde->dw_fde_vms_end_prologue)
+          add_AT_vms_delta (subr_die, DW_AT_HP_prologue,
+	    fde->dw_fde_begin, fde->dw_fde_vms_end_prologue);
+
+        if (fde->dw_fde_vms_begin_epilogue)
+          add_AT_vms_delta (subr_die, DW_AT_HP_epilogue,
+	    fde->dw_fde_begin, fde->dw_fde_vms_begin_epilogue);
+      }
+#endif
+
 	  add_pubname (decl, subr_die);
 	  add_arange (decl, subr_die);
 	}
diff --git a/gcc/dwarf2out.h b/gcc/dwarf2out.h
index 85c320d..21d87cb 100644
--- a/gcc/dwarf2out.h
+++ b/gcc/dwarf2out.h
@@ -1,5 +1,5 @@
 /* dwarf2out.h - Various declarations for functions found in dwarf2out.c
-   Copyright (C) 1998, 1999, 2000, 2003, 2007
+   Copyright (C) 1998, 1999, 2000, 2003, 2007, 2010
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -20,7 +20,7 @@ along with GCC; see the file COPYING3.  If not see
 
 extern void dwarf2out_decl (tree);
 extern void dwarf2out_frame_debug (rtx, bool);
-extern void dwarf2out_begin_epilogue (rtx);
+extern void dwarf2out_cfi_begin_epilogue (rtx);
 extern void dwarf2out_frame_debug_restore_state (void);
 
 extern void debug_dwarf (void);
diff --git a/gcc/final.c b/gcc/final.c
index 6ca3634..31e9155 100644
--- a/gcc/final.c
+++ b/gcc/final.c
@@ -1896,8 +1896,9 @@ final_scan_insn (rtx insn, FILE *file, int optimize ATTRIBUTE_UNUSED,
 	case NOTE_INSN_EPILOGUE_BEG:
 #if defined (DWARF2_UNWIND_INFO) && defined (HAVE_epilogue)
 	  if (dwarf2out_do_frame ())
-	    dwarf2out_begin_epilogue (insn);
+	    dwarf2out_cfi_begin_epilogue (insn);
 #endif
+	  (*debug_hooks->begin_epilogue) (last_linenum, last_filename);
 	  targetm.asm_out.function_begin_epilogue (file);
 	  break;
 
diff --git a/gcc/sdbout.c b/gcc/sdbout.c
index 87a00b4..f0e54bf 100644
--- a/gcc/sdbout.c
+++ b/gcc/sdbout.c
@@ -1,6 +1,6 @@
 /* Output sdb-format symbol table information from GNU compiler.
    Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-   2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
+   2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -325,6 +325,7 @@ const struct gcc_debug_hooks sdb_debug_hooks =
   sdbout_begin_prologue,	         /* begin_prologue */
   debug_nothing_int_charstar,	         /* end_prologue */
 #endif
+  debug_nothing_int_charstar,	         /* begin_epilogue */
   sdbout_end_epilogue,		         /* end_epilogue */
   sdbout_begin_function,	         /* begin_function */
   sdbout_end_function,		         /* end_function */
@@ -1719,6 +1720,7 @@ const struct gcc_debug_hooks sdb_debug_hooks =
   0,		/* source_line */
   0,		/* begin_prologue */
   0,		/* end_prologue */
+  0,		/* begin_epilogue */
   0,		/* end_epilogue */
   0,		/* begin_function */
   0,		/* end_function */
diff --git a/gcc/vmsdbgout.c b/gcc/vmsdbgout.c
index 6856ab3..78d41a4 100644
--- a/gcc/vmsdbgout.c
+++ b/gcc/vmsdbgout.c
@@ -1,6 +1,6 @@
 /* Output VMS debug format symbol table information from GCC.
    Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
+   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
    Free Software Foundation, Inc.
    Contributed by Douglas B. Rupp (rupp@gnat.com).
    Updated by Bernard W. Giroud (bgiroud@users.sourceforge.net).
@@ -202,6 +202,7 @@ const struct gcc_debug_hooks vmsdbg_debug_hooks
    vmsdbgout_source_line,
    vmsdbgout_begin_prologue,
    vmsdbgout_end_prologue,
+   debug_nothing_int_charstar,  /* begin_epilogue */
    vmsdbgout_end_epilogue,
    vmsdbgout_begin_function,
    vmsdbgout_end_function,