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Re: stabs and #define/#undef


Here is an update of the patch for recording #define/#undef in stabs.
I do not have write after approval privileges.

2006-11-03  David Taylor  <dtaylor@emc.com>

	* c-lex.c (init_c_lex):  Set debug callbacks for DBX_DEBUG also,
	as it's now implemented.
	* dbxout.c (dbxout_define, dbxout_undef):  New functions.
	(dbx_debug_hooks):  Add initializations for dbxout_define and
	dbxout_undef.
	* stab.def (N_MAC_DEFINE, N_MAC_UNDEF): Define.  Update stab
        matrix.

Index: gcc/c-lex.c
===================================================================
--- gcc/c-lex.c	(revision 117374)
+++ gcc/c-lex.c	(working copy)
@@ -102,6 +102,7 @@
   /* Set the debug callbacks if we can use them.  */
   if (debug_info_level == DINFO_LEVEL_VERBOSE
       && (write_symbols == DWARF2_DEBUG
+          || write_symbols == DBX_DEBUG
 	  || write_symbols == VMS_AND_DWARF2_DEBUG))
     {
       cb->define = cb_define;
Index: gcc/dbxout.c
===================================================================
--- gcc/dbxout.c	(revision 117374)
+++ gcc/dbxout.c	(working copy)
@@ -312,6 +312,8 @@
 static void dbxout_init (const char *);
  
 static void dbxout_finish (const char *);
+static void dbxout_define (unsigned, const char *);
+static void dbxout_undef (unsigned, const char *);
 static void dbxout_start_source_file (unsigned, const char *);
 static void dbxout_end_source_file (unsigned);
 static void dbxout_typedefs (tree);
@@ -348,8 +350,8 @@
 {
   dbxout_init,
   dbxout_finish,
-  debug_nothing_int_charstar,
-  debug_nothing_int_charstar,
+  dbxout_define,
+  dbxout_undef,
   dbxout_start_source_file,
   dbxout_end_source_file,
   dbxout_begin_block,
@@ -1147,6 +1149,34 @@
 emit_pending_bincls_if_required (void) {}
 #endif
 
+/* The `buffer' parameter contains the tail part of the directive
+   line, i.e. the part which is past the initial whitespace, #,
+   whitespace, directive-name, whitespace part.  */
+
+static void
+dbxout_define (unsigned lineno, const char *buffer)
+{
+  if (debug_info_level >= DINFO_LEVEL_VERBOSE)
+    {
+      dbxout_begin_simple_stabs_desc (buffer, N_MAC_DEFINE, lineno);
+      dbxout_stab_value_zero ();
+    }
+}
+
+/* The `buffer' parameter contains the tail part of the directive
+   line, i.e. the part which is past the initial whitespace, #,
+   whitespace, directive-name, whitespace part.  */
+
+static void
+dbxout_undef (unsigned lineno, const char *buffer)
+{
+  if (debug_info_level >= DINFO_LEVEL_VERBOSE)
+    {
+      dbxout_begin_simple_stabs_desc (buffer, N_MAC_UNDEF, lineno);
+      dbxout_stab_value_zero ();
+    }
+}
+
 /* Change to reading from a new source file.  Generate a N_BINCL stab.  */
 
 static void
Index: gcc/stab.def
===================================================================
--- gcc/stab.def	(revision 117374)
+++ gcc/stab.def	(working copy)
@@ -59,10 +59,16 @@
 /* "No DST map for sym: name, ,0,type,ignored"  according to Ultrix V4.0.  */
 __define_stab (N_NOMAP, 0x34, "NOMAP")
 
+/* GNU extension.  Macro define.  */
+__define_stab(N_MAC_DEFINE, 0x36, "MAC_DEFINE")
+
 /* New stab from Solaris.  I don't know what it means, but it
    don't seem to contain useful information.  */
 __define_stab (N_OBJ, 0x38, "OBJ")
 
+/* GNU extension.  Macro undefine.  */
+__define_stab(N_MAC_UNDEF, 0x3a, "MAC_UNDEF")
+
 /* New stab from Solaris.  I don't know what it means, but it
    don't seem to contain useful information.  Possibly related to the
    optimization flags used in this module.  */
@@ -188,53 +194,53 @@
 /* The above information, in matrix format.
 
 			STAB MATRIX
-	_________________________________________________
-	| 00 - 1F are not dbx stab symbols		|
-	| In most cases, the low bit is the EXTernal bit|
+	_________________________________________________________________
+        | 00 - 1F are not dbx stab symbols                              |
+        | In most cases, the low bit is the EXTernal bit                |
 
-	| 00 UNDEF  | 02 ABS	| 04 TEXT   | 06 DATA	|
-	| 01  |EXT  | 03  |EXT	| 05  |EXT  | 07  |EXT	|
+        | 00 UNDEF      | 02 ABS        | 04 TEXT       | 06 DATA       |
+        | 01  |EXT      | 03  |EXT      | 05  |EXT      | 07  |EXT      |
 
-	| 08 BSS    | 0A INDR	| 0C FN_SEQ | 0E   	|
-	| 09  |EXT  | 0B 	| 0D	    | 0F	|
+        | 08 BSS        | 0A INDR       | 0C FN_SEQ     | 0E            |
+        | 09  |EXT      | 0B            | 0D            | 0F            |
 
-	| 10 	    | 12 COMM	| 14 SETA   | 16 SETT	|
-	| 11	    | 13	| 15 	    | 17	|
+        | 10            | 12 COMM       | 14 SETA       | 16 SETT       |
+        | 11            | 13            | 15            | 17            |
 
-	| 18 SETD   | 1A SETB	| 1C SETV   | 1E WARNING|
-	| 19	    | 1B	| 1D 	    | 1F FN	|
+        | 18 SETD       | 1A SETB       | 1C SETV       | 1E WARNING    |
+        | 19            | 1B            | 1D            | 1F FN         |
 
-	|_______________________________________________|
-	| Debug entries with bit 01 set are unused.	|
-	| 20 GSYM   | 22 FNAME	| 24 FUN    | 26 STSYM	|
-	| 28 LCSYM  | 2A MAIN	| 2C	    | 2E BNSYM	|
-	| 30 PC	    | 32 NSYMS	| 34 NOMAP  | 36	|
-	| 38 OBJ    | 3A	| 3C OPT    | 3E	|
-	| 40 RSYM   | 42 M2C	| 44 SLINE  | 46 DSLINE |
-	| 48 BSLINE*| 4A DEFD	| 4C        | 4E ENSYM	|
-	| 50 EHDECL*| 52	| 54 CATCH  | 56        |
-	| 58        | 5A        | 5C        | 5E	|
-	| 60 SSYM   | 62	| 64 SO	    | 66 	|
-	| 68 	    | 6A	| 6C	    | 6E	|
-	| 70	    | 72	| 74	    | 76	|
-	| 78	    | 7A	| 7C	    | 7E	|
-	| 80 LSYM   | 82 BINCL	| 84 SOL    | 86	|
-	| 88	    | 8A	| 8C	    | 8E	|
-	| 90	    | 92	| 94	    | 96	|
-	| 98	    | 9A	| 9C	    | 9E	|
-	| A0 PSYM   | A2 EINCL	| A4 ENTRY  | A6	|
-	| A8	    | AA	| AC	    | AE	|
-	| B0	    | B2	| B4	    | B6	|
-	| B8	    | BA	| BC	    | BE	|
-	| C0 LBRAC  | C2 EXCL	| C4 SCOPE  | C6	|
-	| C8	    | CA	| CC	    | CE	|
-	| D0	    | D2	| D4	    | D6	|
-	| D8	    | DA	| DC	    | DE	|
-	| E0 RBRAC  | E2 BCOMM	| E4 ECOMM  | E6	|
-	| E8 ECOML  | EA	| EC	    | EE	|
-	| F0	    | F2	| F4	    | F6	|
-	| F8	    | FA	| FC	    | FE LENG	|
-	+-----------------------------------------------+
+        |_______________________________________________                |
+        | Debug entries with bit 01 set are unused.                     |
+        | 20 GSYM       | 22 FNAME      | 24 FUN        | 26 STSYM      |
+        | 28 LCSYM      | 2A MAIN       | 2C            | 2E BNSYM      |
+        | 30 PC         | 32 NSYMS      | 34 NOMAP      | 36 MAC_DEFINE |
+        | 38 OBJ        | 3A MAC_UNDEF  | 3C OPT        | 3E            |
+        | 40 RSYM       | 42 M2C        | 44 SLINE      | 46 DSLINE     |
+        | 48 BSLINE*    | 4A DEFD       | 4C            | 4E ENSYM      |
+        | 50 EHDECL*    | 52            | 54 CATCH      | 56            |
+        | 58            | 5A            | 5C            | 5E            |
+        | 60 SSYM       | 62            | 64 SO         | 66            |
+        | 68            | 6A            | 6C            | 6E            |
+        | 70            | 72            | 74            | 76            |
+        | 78            | 7A            | 7C            | 7E            |
+        | 80 LSYM       | 82 BINCL      | 84 SOL        | 86            |
+        | 88            | 8A            | 8C            | 8E            |
+        | 90            | 92            | 94            | 96            |
+        | 98            | 9A            | 9C            | 9E            |
+        | A0 PSYM       | A2 EINCL      | A4 ENTRY      | A6            |
+        | A8            | AA            | AC            | AE            |
+        | B0            | B2            | B4            | B6            |
+        | B8            | BA            | BC            | BE            |
+        | C0 LBRAC      | C2 EXCL       | C4 SCOPE      | C6            |
+        | C8            | CA            | CC            | CE            |
+        | D0            | D2            | D4            | D6            |
+        | D8            | DA            | DC            | DE            |
+        | E0 RBRAC      | E2 BCOMM      | E4 ECOMM      | E6            |
+        | E8 ECOML      | EA            | EC            | EE            |
+        | F0            | F2            | F4            | F6            |
+        | F8            | FA            | FC            | FE LENG       |
+        +---------------------------------------------------------------+
  * 50 EHDECL is also MOD2.
  * 48 BSLINE is also BROWS.
  */

David
--
David Taylor
dtaylor@emc.com


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