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[RFA] Debug hooks


This patch starts adding debug hooks to GCC to produce debug output.

With just this beginning, conditional compilation only goes down a
bit, but everything in the future will be a large win.  It should make
it easier to add new debug formats in future, and makes the heavily
conditionally compiled code in e.g. toplev.c much easier to read.

With a bit more work, I hope to get rid of sdbout.h, dwarfout.h,
dwarfout2.h and dbxout.h altogether.

Bootstrapping x86 Linux, now on stage 3 with no new warnings.  OK to
commit?

Neil.

	* Makefile.in (toplev.o, sdbout.o, dbxout.o, dwarfout.o,
	dwarf2out.o): Depend on debug.h, wrap long lines.
	* dbxout.c: Include debug.h.
	(dbx_debug_hooks): New.
	(dbxout_init): Make static, take just 2 args.
	(dbxout_finish): Make static.
	* dbxout.h (dbxout_init, dbxout_finish): Delete.
	* debug.h: New file.
	* dwarf2out.c: Include debug.h.
	(dwarf2_debug_hooks): New.
	(dwarf2out_init): Make static.
	(dwarf2out_finish): Make static, take 2 args.
	* dwarf2out.h (dwarf2out_init, dwarf2out_finish): Delete.
	* dwarfout.c: Include debug.h.
	(dwarf_debug_hooks): New.
	(dwarfout_init): Make static.
	(dwarfout_finish): Make static, take 2 args.
	* dwarfout.h (dwarfout_init, dwarfout_finish): Delete.
	* sdbout.c: Include debug.h.
	(sdb_debug_hooks): New.
	(sdbout_init): Make static, take 2 args.
	(sdbout_finish): New.
	* sdbout.h (sdbout_init): Delete.
	* toplev.c: Include debug.h.
	(debug_hooks): New.
	(compile_file): Set deubg_hooks based on command line options.
	Use the hooks rather than conditional compilation.
	* doc/tm.texi: Fix markup.

============================================================
Index: gcc/Makefile.in
--- gcc/Makefile.in	2001/07/09 19:42:26	1.693
+++ gcc/Makefile.in	2001/07/09 20:50:56
@@ -1339,7 +1339,7 @@ diagnostic.o : diagnostic.c diagnostic.h
    $(GGC_H) input.h $(INSN_ATTR_H) insn-config.h toplev.h intl.h
 toplev.o : toplev.c $(CONFIG_H) $(SYSTEM_H) $(TREE_H) $(RTL_H) function.h \
    flags.h input.h $(INSN_ATTR_H) xcoffout.h output.h diagnostic.h \
-   insn-config.h intl.h $(RECOG_H) Makefile toplev.h dwarfout.h \
+   debug.h insn-config.h intl.h $(RECOG_H) Makefile toplev.h dwarfout.h \
    dwarf2out.h sdbout.h dbxout.h $(EXPR_H) hard-reg-set.h $(BASIC_BLOCK_H) \
    graph.h $(LOOP_H) except.h $(REGS_H) $(TIMEVAR_H) $(lang_options_files) \
    ssa.h $(PARAMS_H) $(TM_P_H) reload.h dwarf2asm.h
@@ -1391,17 +1391,18 @@ explow.o : explow.c $(CONFIG_H) $(SYSTEM
 optabs.o : optabs.c $(CONFIG_H) $(SYSTEM_H) $(RTL_H) $(TREE_H) flags.h  \
    insn-config.h $(EXPR_H) $(RECOG_H) reload.h \
    toplev.h $(GGC_H) real.h $(TM_P_H) except.h
-dbxout.o : dbxout.c $(CONFIG_H) $(SYSTEM_H) $(TREE_H) $(RTL_H) flags.h $(REGS_H) \
-   insn-config.h reload.h gstab.h xcoffout.h output.h dbxout.h toplev.h \
-   $(TM_P_H)
-sdbout.o : sdbout.c $(CONFIG_H) $(SYSTEM_H) $(TREE_H) $(RTL_H) flags.h except.h \
+dbxout.o : dbxout.c $(CONFIG_H) $(SYSTEM_H) $(TREE_H) $(RTL_H) flags.h \
+    $(REGS_H) debug.h $(TM_P_H) \
+   insn-config.h reload.h gstab.h xcoffout.h output.h dbxout.h toplev.h
+sdbout.o : sdbout.c $(CONFIG_H) $(SYSTEM_H) $(TREE_H) $(RTL_H) flags.h \
    function.h $(EXPR_H) output.h hard-reg-set.h $(REGS_H) real.h \
    insn-config.h $(OBSTACK_H) xcoffout.h c-pragma.h ggc.h \
-   sdbout.h toplev.h $(TM_P_H)
+   sdbout.h toplev.h $(TM_P_H) except.h debug.h
 dwarfout.o : dwarfout.c $(CONFIG_H) $(SYSTEM_H) $(TREE_H) $(RTL_H) dwarf.h \
-   flags.h insn-config.h reload.h output.h toplev.h dwarfout.h $(TM_P_H)
+   flags.h insn-config.h reload.h output.h toplev.h dwarfout.h $(TM_P_H) \
+   debug.h
 dwarf2out.o : dwarf2out.c $(CONFIG_H) $(SYSTEM_H) $(TREE_H) $(RTL_H) dwarf2.h \
-   flags.h insn-config.h reload.h output.h diagnostic.h \
+   debug.h flags.h insn-config.h reload.h output.h diagnostic.h \
    hard-reg-set.h $(REGS_H) $(EXPR_H) toplev.h dwarf2out.h varray.h \
    $(GGC_H) except.h dwarf2asm.h $(TM_P_H)
 dwarf2asm.o : dwarf2asm.c $(CONFIG_H) $(SYSTEM_H) flags.h $(RTL_H) $(TREE_H) \
============================================================
Index: gcc/dbxout.c
--- gcc/dbxout.c	2001/06/08 18:12:54	1.87
+++ gcc/dbxout.c	2001/07/09 20:51:00
@@ -82,6 +82,7 @@ Boston, MA 02111-1307, USA.  */
 #include "toplev.h"
 #include "tm_p.h"
 #include "ggc.h"
+#include "debug.h"
 
 #ifdef XCOFF_DEBUGGING_INFO
 #include "xcoffout.h"
@@ -283,6 +284,8 @@ static int current_sym_nchars;
 #define CONTIN do { } while (0)
 #endif
 
+static void dbxout_init			PARAMS ((FILE *, const char *));
+static void dbxout_finish		PARAMS ((FILE *, const char *));
 #if defined(ASM_OUTPUT_SECTION_NAME)
 static void dbxout_function_end		PARAMS ((void));
 #endif
@@ -306,6 +309,13 @@ static void dbxout_finish_symbol	PARAMS 
 static void dbxout_block		PARAMS ((tree, int, tree));
 static void dbxout_really_begin_function PARAMS ((tree));
 
+/* The target debug structure.  */
+struct gcc_debug_hooks dbx_debug_hooks =
+{
+  dbxout_init,
+  dbxout_finish
+};
+
 #if defined(ASM_OUTPUT_SECTION_NAME)
 static void
 dbxout_function_end ()
@@ -332,13 +342,13 @@ dbxout_function_end ()
 /* At the beginning of compilation, start writing the symbol table.
    Initialize `typevec' and output the standard data types of C.  */
 
-void
-dbxout_init (asm_file, input_file_name, syms)
+static void
+dbxout_init (asm_file, input_file_name)
      FILE *asm_file;
      const char *input_file_name;
-     tree syms;
 {
   char ltext_label_name[100];
+  tree syms = getdecls ();
 
   asmfile = asm_file;
 
@@ -535,7 +545,7 @@ dbxout_source_line (file, filename, line
    Unless you define DBX_OUTPUT_MAIN_SOURCE_FILE_END, the default is
    to do nothing.  */
 
-void
+static void
 dbxout_finish (file, filename)
      FILE *file ATTRIBUTE_UNUSED;
      const char *filename ATTRIBUTE_UNUSED;
============================================================
Index: gcc/dbxout.h
--- gcc/dbxout.h	2000/02/29 23:33:48	1.7
+++ gcc/dbxout.h	2001/07/09 20:51:00
@@ -18,9 +18,6 @@ along with GNU CC; see the file COPYING.
 the Free Software Foundation, 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */
 
-extern void dbxout_init 		PARAMS ((FILE *, const char *, tree));
-extern void dbxout_finish		PARAMS ((FILE *, const char *));
-
 extern void dbxout_start_new_source_file 	PARAMS ((const char *));
 extern void dbxout_resume_previous_source_file	PARAMS ((void));
 
============================================================
Index: gcc/debug.h
--- /dev/null	Tue May  5 13:32:27 1998
+++ gcc/debug.h	Mon Jul  9 13:51:00 2001
@@ -0,0 +1,36 @@
+/* Debug hooks for GCC.
+   Copyright (C) 2001 Free Software Foundation, Inc.
+
+This program 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.
+
+This program 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 this program; if not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifndef GCC_DEBUG_H
+#define GCC_DEBUG_H
+
+/* This structure contains hooks for the debug information output
+   functions, accessed through the global instance debug_hooks set in
+   toplev.c according to command line options.  */
+struct gcc_debug_hooks
+{
+  /* Initialise debug output to FILE.  MAIN_FILENAME is the name of
+     the main input file.  */
+  void (* init) PARAMS ((FILE * file, const char *main_filename));
+
+  /* Output debug symbols to FILE.  */
+  void (* finish) PARAMS ((FILE * file, const char *main_filename));
+};
+
+extern struct gcc_debug_hooks *debug_hooks;
+
+#endif /* !GCC_DEBUG_H  */
============================================================
Index: gcc/dwarf2out.c
--- gcc/dwarf2out.c	2001/07/06 11:38:41	1.282
+++ gcc/dwarf2out.c	2001/07/09 20:51:30
@@ -57,6 +57,7 @@ Boston, MA 02111-1307, USA.  */
 #include "md5.h"
 #include "tm_p.h"
 #include "diagnostic.h"
+#include "debug.h"
 
 /* DWARF2 Abbreviation Glossary:
    CFA = Canonical Frame Address
@@ -231,6 +232,8 @@ static unsigned current_funcdef_fde;
 
 /* Forward declarations for functions defined in this file.  */
 
+static void dwarf2out_init 		PARAMS ((FILE *, const char *));
+static void dwarf2out_finish		PARAMS ((FILE *, const char *));
 static char *stripattributes		PARAMS ((const char *));
 static const char *dwarf_cfi_name	PARAMS ((unsigned));
 static dw_cfi_ref new_cfi		PARAMS ((void));
@@ -360,7 +363,15 @@ expand_builtin_dwarf_fp_regnum ()
 #ifndef INCOMING_FRAME_SP_OFFSET
 #define INCOMING_FRAME_SP_OFFSET 0
 #endif
+
+/* The target debug structure.  */
 
+struct gcc_debug_hooks dwarf2_debug_hooks =
+{
+  dwarf2out_init,
+  dwarf2out_finish
+};
+
 /* Return a pointer to a copy of the section string name S with all
    attributes stripped off, and an asterisk prepended (for assemble_name).  */
 
@@ -11356,7 +11367,7 @@ dwarf2out_undef (lineno, buffer)
 
 /* Set up for Dwarf output at the start of compilation.  */
 
-void
+static void
 dwarf2out_init (asm_out_file, main_input_filename)
      register FILE *asm_out_file;
      register const char *main_input_filename;
@@ -11446,8 +11457,10 @@ dwarf2out_init (asm_out_file, main_input
 /* Output stuff that dwarf requires at the end of every file,
    and generate the DWARF-2 debugging info.  */
 
-void
-dwarf2out_finish ()
+static void
+dwarf2out_finish (asm_out_file, input_filename)
+     register FILE *asm_out_file;
+     register const char *input_filename ATTRIBUTE_UNUSED;
 {
   limbo_die_node *node, *next_node;
   dw_die_ref die;
============================================================
Index: gcc/dwarf2out.h
--- gcc/dwarf2out.h	2001/07/04 17:55:18	1.13
+++ gcc/dwarf2out.h	2001/07/09 20:51:30
@@ -18,9 +18,6 @@ along with GNU CC; see the file COPYING.
 the Free Software Foundation, 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */
 
-extern void dwarf2out_init 		PARAMS ((FILE *, const char *));
-extern void dwarf2out_finish		PARAMS ((void));
-
 extern void dwarf2out_define		PARAMS ((unsigned, const char *));
 extern void dwarf2out_undef 		PARAMS ((unsigned, const char *));
 extern void dwarf2out_start_source_file	PARAMS ((unsigned, const char *));
============================================================
Index: gcc/dwarfout.c
--- gcc/dwarfout.c	2001/05/21 03:14:29	1.86
+++ gcc/dwarfout.c	2001/07/09 20:51:50
@@ -577,6 +577,7 @@ Boston, MA 02111-1307, USA.  */
 #include "dwarfout.h"
 #include "toplev.h"
 #include "tm_p.h"
+#include "debug.h"
 
 /* IMPORTANT NOTE: Please see the file README.DWARF for important details
    regarding the GNU implementation of Dwarf.  */
@@ -786,6 +787,8 @@ static int in_class;
 
 /* Forward declarations for functions defined in this file.  */
 
+static void dwarfout_init 		PARAMS ((FILE *, const char *));
+static void dwarfout_finish		PARAMS ((FILE *, const char *));
 static const char *dwarf_tag_name	PARAMS ((unsigned));
 static const char *dwarf_attr_name	PARAMS ((unsigned));
 static const char *dwarf_stack_op_name	PARAMS ((unsigned));
@@ -1358,6 +1361,13 @@ static void retry_incomplete_types	PARAM
 #endif
 
 
+/* The target debug structure.  */
+struct gcc_debug_hooks dwarf_debug_hooks =
+{
+  dwarfout_init,
+  dwarfout_finish
+};
+
 /************************ general utility functions **************************/
 
 static inline int
@@ -6166,7 +6176,7 @@ dwarfout_undef (lineno, buffer)
 
 /* Set up for Dwarf output at the start of compilation.	 */
 
-void
+static void
 dwarfout_init (asm_out_file, main_input_filename)
      register FILE *asm_out_file;
      register const char *main_input_filename;
@@ -6356,8 +6366,10 @@ dwarfout_init (asm_out_file, main_input_
 
 /* Output stuff that dwarf requires at the end of every file.  */
 
-void
-dwarfout_finish ()
+static void
+dwarfout_finish (asm_out_file, main_input_filename)
+     register FILE *asm_out_file;
+     register const char *main_input_filename ATTRIBUTE_UNUSED;
 {
   char label[MAX_ARTIFICIAL_LABEL_BYTES];
 
============================================================
Index: gcc/dwarfout.h
--- gcc/dwarfout.h	2000/11/08 02:18:00	1.7
+++ gcc/dwarfout.h	2001/07/09 20:51:50
@@ -18,9 +18,6 @@ along with GNU CC; see the file COPYING.
 the Free Software Foundation, 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */
 
-extern void dwarfout_init 		PARAMS ((FILE *, const char *));
-extern void dwarfout_finish		PARAMS ((void));
-
 extern void dwarfout_define		PARAMS ((unsigned, const char *));
 extern void dwarfout_undef 		PARAMS ((unsigned, const char *));
 extern void dwarfout_file_scope_decl 	PARAMS ((tree , int));
============================================================
Index: gcc/sdbout.c
--- gcc/sdbout.c	2001/05/01 01:58:32	1.43
+++ gcc/sdbout.c	2001/07/09 20:51:54
@@ -57,6 +57,7 @@ AT&T C compiler.  From the example below
 #include "ggc.h"
 #include "tm_p.h"
 #include "gsyms.h"
+#include "debug.h"
 
 /* 1 if PARM is passed to this function in memory.  */
 
@@ -91,6 +92,8 @@ extern tree current_function_decl;
 
 #include "sdbout.h"
 
+static void sdbout_init			PARAMS ((FILE *, const char *));
+static void sdbout_finish		PARAMS ((FILE *, const char *));
 static char *gen_fake_label		PARAMS ((void));
 static int plain_type			PARAMS ((tree));
 static int template_name_p		PARAMS ((tree));
@@ -287,7 +290,13 @@ static struct sdb_file *current_file;
 
 #endif /* MIPS_DEBUGGING_INFO */
 
-
+/* The target debug structure.  */
+struct gcc_debug_hooks sdb_debug_hooks =
+{
+  sdbout_init,
+  sdbout_finish
+};
+
 #if 0
 
 /* return the tag identifier for type
@@ -1607,11 +1616,10 @@ sdbout_resume_previous_source_file ()
 
 /* Set up for SDB output at the start of compilation.  */
 
-void
-sdbout_init (asm_file, input_file_name, syms)
+static void
+sdbout_init (asm_file, input_file_name)
      FILE *asm_file ATTRIBUTE_UNUSED;
      const char *input_file_name ATTRIBUTE_UNUSED;
-     tree syms ATTRIBUTE_UNUSED;
 {
 #ifdef MIPS_DEBUGGING_INFO
   current_file = (struct sdb_file *) xmalloc (sizeof *current_file);
@@ -1621,7 +1629,7 @@ sdbout_init (asm_file, input_file_name, 
 
 #ifdef RMS_QUICK_HACK_1
   tree t;
-  for (t = syms; t; t = TREE_CHAIN (t))
+  for (t = getdecls (); 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);
@@ -1630,6 +1638,15 @@ sdbout_init (asm_file, input_file_name, 
 #ifdef SDB_ALLOW_FORWARD_REFERENCES
   ggc_add_tree_root (&anonymous_types, 1);
 #endif
+}
+
+/* Hook called from toplev.c; do nothing.  */
+
+static void
+sdbout_finish (asm_file, input_file_name)
+     FILE *asm_file ATTRIBUTE_UNUSED;
+     const char *main_file_name ATTRIBUTE_UNUSED;
+{
 }
 
 #endif /* SDB_DEBUGGING_INFO */
============================================================
Index: gcc/sdbout.h
--- gcc/sdbout.h	2000/06/06 12:08:44	1.6
+++ gcc/sdbout.h	2001/07/09 20:51:54
@@ -18,8 +18,6 @@ along with GNU CC; see the file COPYING.
 the Free Software Foundation, 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */
 
-extern void sdbout_init			PARAMS ((FILE *, const char *, tree));
-
 extern void sdbout_begin_function	PARAMS ((int));
 extern void sdbout_end_function		PARAMS ((int));
 
============================================================
Index: gcc/toplev.c
--- gcc/toplev.c	2001/07/09 19:42:26	1.479
+++ gcc/toplev.c	2001/07/09 20:52:11
@@ -66,6 +66,7 @@ Boston, MA 02111-1307, USA.  */
 #include "reload.h"
 #include "dwarf2asm.h"
 #include "integrate.h"
+#include "debug.h"
 
 #ifdef DWARF_DEBUGGING_INFO
 #include "dwarfout.h"
@@ -225,6 +226,15 @@ const char *dump_base_name;
 
 extern int target_flags;
 
+/* Debug hooks - dependent upon command line options.  */
+
+extern struct gcc_debug_hooks dbx_debug_hooks;
+extern struct gcc_debug_hooks sdb_debug_hooks;
+extern struct gcc_debug_hooks dwarf_debug_hooks;
+extern struct gcc_debug_hooks dwarf2_debug_hooks;
+
+struct gcc_debug_hooks *debug_hooks;
+
 /* Describes a dump file.  */
 
 struct dump_file_info
@@ -2281,6 +2291,24 @@ compile_file (name)
 #endif
     } /* ! flag_syntax_only  */
 
+  /* Set up the debug hooks based on write_symbols.  */
+#if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
+  if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
+    debug_hooks = dbx_debug_hooks;
+#endif
+#ifdef SDB_DEBUGGING_INFO
+  if (write_symbols == SDB_DEBUG)
+    debug_hooks = sdb_debug_hooks;
+#endif
+#ifdef DWARF_DEBUGGING_INFO
+  if (write_symbols == DWARF_DEBUG)
+    debug_hooks = dwarf_debug_hooks;
+#endif
+#ifdef DWARF2_DEBUGGING_INFO
+  if (write_symbols == DWARF2_DEBUG)
+    debug_hooks = dwarf2_debug_hooks;
+#endif
+
 #ifndef ASM_OUTPUT_SECTION_NAME
   if (flag_function_sections)
     {
@@ -2309,26 +2337,12 @@ compile_file (name)
   /* If dbx symbol table desired, initialize writing it
      and output the predefined types.  */
   timevar_push (TV_SYMOUT);
-#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
-  if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
-    dbxout_init (asm_out_file, main_input_filename, getdecls ());
-#endif
-#ifdef SDB_DEBUGGING_INFO
-  if (write_symbols == SDB_DEBUG)
-    sdbout_init (asm_out_file, main_input_filename, getdecls ());
-#endif
-#ifdef DWARF_DEBUGGING_INFO
-  if (write_symbols == DWARF_DEBUG)
-    dwarfout_init (asm_out_file, main_input_filename);
-#endif
 #ifdef DWARF2_UNWIND_INFO
   if (dwarf2out_do_frame ())
     dwarf2out_frame_init ();
 #endif
-#ifdef DWARF2_DEBUGGING_INFO
-  if (write_symbols == DWARF2_DEBUG)
-    dwarf2out_init (asm_out_file, main_input_filename);
-#endif
+  if (debug_hooks)
+    (*debug_hooks.init) (asm_out_file, main_input_filename);
   timevar_pop (TV_SYMOUT);
 
   /* Initialize yet another pass.  */
@@ -2401,25 +2415,13 @@ compile_file (name)
 
   /* Do dbx symbols.  */
   timevar_push (TV_SYMOUT);
-#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
-  if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
-    dbxout_finish (asm_out_file, main_input_filename);
-#endif
-
-#ifdef DWARF_DEBUGGING_INFO
-  if (write_symbols == DWARF_DEBUG)
-    dwarfout_finish ();
-#endif
-
 #ifdef DWARF2_UNWIND_INFO
   if (dwarf2out_do_frame ())
     dwarf2out_frame_finish ();
 #endif
 
-#ifdef DWARF2_DEBUGGING_INFO
-  if (write_symbols == DWARF2_DEBUG)
-    dwarf2out_finish ();
-#endif
+  if (debug_hooks)
+    (*debug_hooks.finish) (asm_out_file, main_input_filename);
   timevar_pop (TV_SYMOUT);
 
   /* Output some stuff at end of file if nec.  */
============================================================
Index: gcc/doc/tm.texi
--- gcc/doc/tm.texi	2001/07/09 06:17:25	1.31
+++ gcc/doc/tm.texi	2001/07/09 20:52:41
@@ -5982,8 +5982,7 @@ the character @samp{;} is treated as a l
 @end table
 
 @deftypevr {Target Hook} {const char *} TARGET_ASM_OPEN_PAREN
-@end deftypevr
-@deftypevr {Target Hook} {const char *} TARGET_ASM_CLOSE_PAREN
+@deftypevrx {Target Hook} {const char *} TARGET_ASM_CLOSE_PAREN
 These target hooks are C string constants, describing the syntax in the
 assembler for grouping arithmetic expressions.  If not overridden, they
 default to normal parentheses, which is correct for most assemblers.


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