defaults.h (ASM_OUTPUT_ALTERNATE_LABEL_NAME): Provide default.

        * defaults.h (ASM_OUTPUT_ALTERNATE_LABEL_NAME): Provide default.
        * emit-rtl.c (gen_label_rtx): Support LABEL_ALTERNATE_NAME.
        * final.c (final_scan_insn): Emit LABEL_ALTERNATE_NAME.
        * ggc-common.c (ggc_mark_rtx_children): Mark LABEL_ALTERNATE_NAME.
        * jump.c (delete_unreferenced_labels): Don't delete if
        LABEL_ALTERNATE_NAME is set.
        * print-rtl.c (print_rtx): Dump alternate name.
        * rtl.def (CODE_LABEL): Change format to "iuuis00s".
        * rtl.h (LABEL_ALTERNATE_NAME): Define.
        * rtl.texi (LABEL_ALTERNATE_NAME): Document.
        * tm.texi (ASM_OUTPUT_ALTERNATE_LABEL_NAME): Document.

From-SVN: r30382

gcc/ChangeLog

+Wed Nov  3 15:40:23 1999  Catherine Moore  <clm@cygnus.com>
+
+        * defaults.h (ASM_OUTPUT_ALTERNATE_LABEL_NAME): Provide default.
+        * emit-rtl.c (gen_label_rtx): Support LABEL_ALTERNATE_NAME.
+        * final.c (final_scan_insn): Emit LABEL_ALTERNATE_NAME.
+        * ggc-common.c (ggc_mark_rtx_children): Mark LABEL_ALTERNATE_NAME.
+        * jump.c (delete_unreferenced_labels): Don't delete if
+        LABEL_ALTERNATE_NAME is set.
+        * print-rtl.c (print_rtx): Dump alternate name.
+        * rtl.def (CODE_LABEL): Change format to "iuuis00s".
+        * rtl.h (LABEL_ALTERNATE_NAME): Define.
+        * rtl.texi (LABEL_ALTERNATE_NAME): Document.
+        * tm.texi (ASM_OUTPUT_ALTERNATE_LABEL_NAME): Document.
+
 Wed Nov  3 15:39:19 1999  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* fix-header.c (recognized_extern, recognized_function): Constify

gcc/defaults.h

@@ -54,6 +54,12 @@ do { fprintf (FILE, "\t%s\t", ASM_LONG);				\
    } while (0)
 #endif
 
+/* Provide default for ASM_OUTPUT_ALTERNATE_LABEL_NAME.  */
+#ifndef ASM_OUTPUT_ALTERNATE_LABEL_NAME
+#define ASM_OUTPUT_ALTERNATE_LABEL_NAME(FILE,INSN) \
+  fprintf (FILE, "%s:\n", LABEL_ALTERNATE_NAME (INSN))
+#endif
+
 /* choose a reasonable default for ASM_OUTPUT_ASCII.  */
 
 #ifndef ASM_OUTPUT_ASCII

gcc/emit-rtl.c

@@ -1523,9 +1523,10 @@ gen_label_rtx ()
   register rtx label;
 
   label = gen_rtx_CODE_LABEL (VOIDmode, 0, NULL_RTX,
-			      NULL_RTX, label_num++, NULL_PTR);
+			      NULL_RTX, label_num++, NULL_PTR, NULL_PTR);
 
   LABEL_NUSES (label) = 0;
+  LABEL_ALTERNATE_NAME (label) = NULL;
   return label;
 }
 

gcc/final.c

@@ -2418,14 +2418,19 @@ final_scan_insn (insn, file, optimize, prescan, nopeepholes)
 	      ASM_OUTPUT_CASE_LABEL (file, "L", CODE_LABEL_NUMBER (insn),
 				     NEXT_INSN (insn));
 #else
-	      ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
+              if (LABEL_ALTERNATE_NAME (insn))
+                ASM_OUTPUT_ALTERNATE_LABEL_NAME (file, insn);
+              else
+	        ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
 #endif
 #endif
 	      break;
 	    }
 	}
-
-      ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
+      if (LABEL_ALTERNATE_NAME (insn))
+        ASM_OUTPUT_ALTERNATE_LABEL_NAME (file, insn);
+      else
+        ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
       break;
 
     default:

gcc/ggc-common.c

@@ -252,6 +252,7 @@ ggc_mark_rtx_children (r)
       break;
     case CODE_LABEL:
       ggc_mark_rtx (LABEL_REFS (r));
+      ggc_mark_string (LABEL_ALTERNATE_NAME (r));
       break;
     case LABEL_REF:
       ggc_mark_rtx (LABEL_NEXTREF (r));

gcc/jump.c

@@ -2433,7 +2433,9 @@ delete_unreferenced_labels (f)
 
   for (insn = f; insn; )
     {
-      if (GET_CODE (insn) == CODE_LABEL && LABEL_NUSES (insn) == 0)
+      if (GET_CODE (insn) == CODE_LABEL
+          && LABEL_NUSES (insn) == 0
+          && LABEL_ALTERNATE_NAME (insn) == NULL)
 	insn = delete_insn (insn);
       else
 	{

gcc/print-rtl.c

@@ -354,7 +354,11 @@ print_rtx (in_rtx)
 #endif
 
   if (GET_CODE (in_rtx) == CODE_LABEL)
-    fprintf (outfile, " [num uses: %d]", LABEL_NUSES (in_rtx));
+    {
+      fprintf (outfile, " [num uses: %d]", LABEL_NUSES (in_rtx));
+      if (LABEL_ALTERNATE_NAME (in_rtx))
+        fprintf (outfile, " [alternate name: %s]", LABEL_ALTERNATE_NAME (in_rtx));
+    }
   
   if (dump_for_graph
       && (is_insn || GET_CODE (in_rtx) == NOTE

gcc/rtl.def

@@ -376,8 +376,9 @@ DEF_RTL_EXPR(BARRIER, "barrier", "iuu", 'x')
    3: is a number that is unique in the entire compilation.
    4: is the user-given name of the label, if any.
    5: is used in jump.c for the use-count of the label.
-   6: is used in flow.c to point to the chain of label_ref's to this label.  */
-DEF_RTL_EXPR(CODE_LABEL, "code_label", "iuuis00", 'x')
+   6: is used in flow.c to point to the chain of label_ref's to this label.
+   7: is the alternate label name.  */
+DEF_RTL_EXPR(CODE_LABEL, "code_label", "iuuis00s", 'x')
      
 /* Say where in the code a source line starts, for symbol table's sake.
    Contains a filename and a line number.  Line numbers <= 0 are special:

gcc/rtl.h

@@ -597,6 +597,9 @@ extern const char * const note_insn_name[];
    of LABEL_REFs that point at it, so unused labels can be deleted.  */
 #define LABEL_NUSES(RTX) XCINT(RTX, 5, CODE_LABEL)
 
+/* Associate a name with a CODE_LABEL.  */
+#define LABEL_ALTERNATE_NAME(RTX) XCSTR(RTX, 7, CODE_LABEL)
+
 /* The original regno this ADDRESSOF was built for.  */
 #define ADDRESSOF_REGNO(RTX) XCINT(RTX, 1, ADDRESSOF)
 

gcc/rtl.texi

@@ -2384,6 +2384,11 @@ The field @code{LABEL_NUSES} is only defined once the jump optimization
 phase is completed and contains the number of times this label is
 referenced in the current function.
 
+@findex LABEL_ALTERNATE_NAME
+The field @code{LABEL_ALTERNATE_NAME} is used to associate a name with
+a @code{code_label}.  If this field is defined, the alternate name will
+be emitted instead of an internally generated label name.
+
 @findex barrier
 @item barrier
 Barriers are placed in the instruction stream when control cannot flow

gcc/tm.texi

@@ -5736,6 +5736,17 @@ The usual definition of this macro is as follows:
 fprintf (@var{stream}, "L%s%d:\n", @var{prefix}, @var{num})
 @end example
 
+@findex ASM_OUTPUT_ALTERNATE_LABEL_NAME
+@item ASM_OUTPUT_ALTERNATE_LABEL_NAME (@var{stream}, @var{string})
+A C statement to output to the stdio stream @var{stream} the string
+@var{string}.
+
+The default definition of this macro is as follows:
+
+@example
+fprintf (@var{stream}, "%s:\n", LABEL_ALTERNATE_NAME (INSN))
+@end example
+
 @findex ASM_GENERATE_INTERNAL_LABEL
 @item ASM_GENERATE_INTERNAL_LABEL (@var{string}, @var{prefix}, @var{num})
 A C statement to store into the string @var{string} a label whose name