tm.texi (TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL): Document.

2006-01-06  Eric Christopher  <echristo@apple.com>

        * doc/tm.texi (TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL): Document.
        (TARGET_UNWIND_EMIT): Fix spelling.
        * target.h (gcc_target): Add except_table_label.
        * except.c (output_function_exception_table): Use.
        * varasm.c (default_emit_except_table_label): New.
        * target-def.h (TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL): New default
        define.
        (asm_out): Add here.
        * output.h (default_emit_except_table_label): Prototype.
        * config/darwin-protos.h (darwin_emit_except_table_label): Ditto.
        * config/darwin.c (darwin_emit_except_table_label): Define.
        * config/darwin.h (TARGET_ASM_EMIT_EXCEPT_TABLE): Ditto.

From-SVN: r109435

gcc/ChangeLog

+2006-01-06  Eric Christopher  <echristo@apple.com>
+
+	* doc/tm.texi (TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL): Document.
+	(TARGET_UNWIND_EMIT): Fix spelling.
+	* target.h (gcc_target): Add except_table_label.
+	* except.c (output_function_exception_table): Use.
+	* varasm.c (default_emit_except_table_label): New.
+	* target-def.h (TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL): New default
+	define.
+	(asm_out): Add here.
+	* output.h (default_emit_except_table_label): Prototype.
+	* config/darwin-protos.h (darwin_emit_except_table_label): Ditto.
+	* config/darwin.c (darwin_emit_except_table_label): Define.
+	* config/darwin.h (TARGET_ASM_EMIT_EXCEPT_TABLE): Ditto.
+
 2005-01-06  Zdenek Dvorak <dvorakz@suse.cz>
 
 	PR tree-optimization/18527
@@ -379,4 +394,3 @@
 	* config/rs6000/sync.md (sync_compare_and_swap{hi,qi}): New.
 	(sync_compare_and_swapqhi_internal): New.
 	* config/rs6000/rs6000-protos.h: Declare.
-

gcc/config/darwin-protos.h

@@ -60,6 +60,7 @@ extern void darwin_asm_named_section (const char *, unsigned int, tree);
 extern void darwin_non_lazy_pcrel (FILE *, rtx);
 
 extern void darwin_emit_unwind_label (FILE *, tree, int, int);
+extern void darwin_emit_except_table_label (FILE *);
 
 extern void darwin_pragma_ignore (struct cpp_reader *);
 extern void darwin_pragma_options (struct cpp_reader *);

gcc/config/darwin.c

@@ -1377,6 +1377,17 @@ darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
   free (lab);
 }
 
+static GTY(()) unsigned long except_table_label_num;
+
+void
+darwin_emit_except_table_label (FILE *file)
+{
+  char section_start_label[30];
+
+  ASM_GENERATE_INTERNAL_LABEL (section_start_label, "GCC_except_table",
+			       except_table_label_num++);
+  ASM_OUTPUT_LABEL (file, section_start_label);
+}
 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol.  */
 
 void

gcc/config/darwin.h

@@ -436,6 +436,9 @@ Boston, MA 02110-1301, USA.  */
    emit a label for an empty FDE. */
 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
 
+/* Emit a label to separate the exception table.  */
+#define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
+
 /* Our profiling scheme doesn't LP labels and counter words.  */
 
 #define NO_PROFILE_COUNTERS	1

gcc/doc/tm.texi

@@ -7687,7 +7687,15 @@ true if this is a placeholder label for an omitted FDE@.
 The default is that FDEs are not given nonlocal labels.
 @end deftypefn
 
-@deftypefn {Taget Hook} void TARGET_UNWIND_EMIT (FILE * @var{stream}, rtx @var{insn})
+@deftypefn {Target Hook} void TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL (@var{stream})
+This target hook emits a label at the beginning of the exception table.
+It should be defined on targets where it is desirable for the table
+to be broken up according to function.
+
+The default is that no label is emitted.
+@end deftypefn
+
+@deftypefn {Target Hook} void TARGET_UNWIND_EMIT (FILE * @var{stream}, rtx @var{insn})
 This target hook emits and assembly directives required to unwind the
 given instruction.  This is only used when TARGET_UNWIND_INFO is set.
 @end deftypefn

gcc/except.c

@@ -252,7 +252,6 @@ struct eh_status GTY(())
   htab_t GTY((param_is (struct throw_stmt_node))) throw_stmt_table;
 };
 
-
 static int t2r_eq (const void *, const void *);
 static hashval_t t2r_hash (const void *);
 static void add_type_for_runtime (tree);
@@ -3539,6 +3538,9 @@ output_function_exception_table (void)
   switch_to_exception_section ();
 #endif
 
+  /* If the target wants a label to begin the table, emit it here.  */
+  targetm.asm_out.except_table_label (asm_out_file);
+
   have_tt_data = (VEC_length (tree, cfun->eh->ttype_data) > 0
 		  || VARRAY_ACTIVE_SIZE (cfun->eh->ehspec_data) > 0);
 

gcc/output.h

@@ -550,6 +550,7 @@ extern bool default_binds_local_p (tree);
 extern bool default_binds_local_p_1 (tree, int);
 extern void default_globalize_label (FILE *, const char *);
 extern void default_emit_unwind_label (FILE *, tree, int, int);
+extern void default_emit_except_table_label (FILE *);
 extern void default_internal_label (FILE *, const char *, unsigned long);
 extern void default_file_start (void);
 extern void file_end_indicate_exec_stack (void);

gcc/target-def.h

@@ -62,6 +62,10 @@ Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #define TARGET_ASM_EMIT_UNWIND_LABEL default_emit_unwind_label
 #endif
 
+#ifndef TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL
+#define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL default_emit_except_table_label
+#endif
+
 #ifndef TARGET_UNWIND_EMIT
 #define TARGET_UNWIND_EMIT default_unwind_emit
 #endif
@@ -221,6 +225,7 @@ Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 			TARGET_ASM_INTEGER,			\
 			TARGET_ASM_GLOBALIZE_LABEL,		\
                         TARGET_ASM_EMIT_UNWIND_LABEL,           \
+			TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL,	\
 			TARGET_UNWIND_EMIT,			\
 			TARGET_ASM_INTERNAL_LABEL,		\
 			TARGET_ASM_TTYPE,			\

gcc/target.h

@@ -102,6 +102,10 @@ struct gcc_target
        this is only a placeholder for an omitted FDE.  */
     void (* unwind_label) (FILE *, tree, int, int);
 
+    /* Output code that will emit a label to divide up the exception
+       table.  */
+    void (* except_table_label) (FILE *);
+
     /* Emit any directives required to unwind this instruction.  */
     void (* unwind_emit) (FILE *, rtx);
 

gcc/varasm.c

@@ -5555,6 +5555,14 @@ default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
 {
 }
 
+/* Default function to output a label to divide up the exception table.
+   The default is to do nothing.  A target that needs/wants to divide
+   up the table must provide it's own function to do this.  */
+void
+default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
+{
+}
+
 /* This is how to output an internal numbered label where PREFIX is
    the class of label and LABELNO is the number within the class.  */