re PR lto/44230 (Do not create need for multiple EH personalities)

	PR lto/44230
	* dwarf2out.c (dwarf2out_begin_prologue): Fix nits in sorry message.
lto/
	* lto.h (lto_eh_personality): New prototype.
	* lto.c: Include debug.h.
	(first_personality_decl): New static variable.
	(lto_materialize_function): Set it to DECL_FUNCTION_PERSONALITY of the
	first function for which it is non-null.
	(lto_eh_personality_decl): New static variable.
	(lto_eh_personality): New function.
	* lto-lang.c (LANG_HOOKS_EH_PERSONALITY): Redefine to above function.
	* Make-lang.in (lto/lto.o): Add dependency on debug.h.

From-SVN: r159921

5 files changed, 48 insertions, 4 deletions

diff --git a/gcc/lto/ChangeLog b/gcc/lto/ChangeLog
index 0ab3a92..2922c80a7 100644
--- a/gcc/lto/ChangeLog
+++ b/gcc/lto/ChangeLog
@@ -1,3 +1,16 @@
+2010-05-27  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR lto/44230
+	* lto.h (lto_eh_personality): New prototype.
+	* lto.c: Include debug.h.
+	(first_personality_decl): New static variable.
+	(lto_materialize_function): Set it to DECL_FUNCTION_PERSONALITY of the
+	first function for which it is non-null.
+	(lto_eh_personality_decl): New static variable.
+	(lto_eh_personality): New function.
+	* lto-lang.c (LANG_HOOKS_EH_PERSONALITY): Redefine to above function.
+	* Make-lang.in (lto/lto.o): Add dependency on debug.h.
+
 2010-05-26  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* lto-lang.c: Do not include expr.h.
diff --git a/gcc/lto/Make-lang.in b/gcc/lto/Make-lang.in
index 1496449..b18747e 100644
--- a/gcc/lto/Make-lang.in
+++ b/gcc/lto/Make-lang.in
@@ -84,7 +84,7 @@ lto/lto.o: lto/lto.c $(CONFIG_H) $(SYSTEM_H) coretypes.h opts.h \
 	toplev.h $(TREE_H) $(DIAGNOSTIC_H) $(TM_H) $(LIBIBERTY_H) \
 	$(CGRAPH_H) $(GGC_H) tree-ssa-operands.h $(TREE_PASS_H) \
 	langhooks.h vec.h $(BITMAP_H) pointer-set.h $(IPA_PROP_H) \
-	$(COMMON_H) $(TIMEVAR_H) $(GIMPLE_H) $(LTO_H) $(LTO_TREE_H) \
+	$(COMMON_H) debug.h $(TIMEVAR_H) $(GIMPLE_H) $(LTO_H) $(LTO_TREE_H) \
 	$(LTO_TAGS_H) $(LTO_STREAMER_H) gt-lto-lto.h
 lto/lto-elf.o: lto/lto-elf.c $(CONFIG_H) coretypes.h $(SYSTEM_H) \
 	toplev.h $(LTO_H) $(TM_H) $(LIBIBERTY_H) $(GGC_H) $(LTO_STREAMER_H)
diff --git a/gcc/lto/lto-lang.c b/gcc/lto/lto-lang.c
index 4882315..974e3d7 100644
--- a/gcc/lto/lto-lang.c
+++ b/gcc/lto/lto-lang.c
@@ -1161,6 +1161,8 @@ static void lto_init_ts (void)
 #define LANG_HOOKS_REDUCE_BIT_FIELD_OPERATIONS true
 #undef LANG_HOOKS_TYPES_COMPATIBLE_P
 #define LANG_HOOKS_TYPES_COMPATIBLE_P NULL
+#undef LANG_HOOKS_EH_PERSONALITY
+#define LANG_HOOKS_EH_PERSONALITY lto_eh_personality
 
 /* Attribute hooks.  */
 #undef LANG_HOOKS_COMMON_ATTRIBUTE_TABLE
diff --git a/gcc/lto/lto.c b/gcc/lto/lto.c
index d1ccc5a..52ef9ed 100644
--- a/gcc/lto/lto.c
+++ b/gcc/lto/lto.c
@@ -37,6 +37,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "pointer-set.h"
 #include "ipa-prop.h"
 #include "common.h"
+#include "debug.h"
 #include "timevar.h"
 #include "gimple.h"
 #include "lto.h"
@@ -61,6 +62,9 @@ along with GCC; see the file COPYING3.  If not see
 DEF_VEC_P(bitmap);
 DEF_VEC_ALLOC_P(bitmap,heap);
 
+static GTY(()) tree first_personality_decl;
+
+
 /* Read the constructors and inits.  */
 
 static void
@@ -75,7 +79,7 @@ lto_materialize_constructors_and_inits (struct lto_file_decl_data * file_data)
 			 data, len);
 }
 
-/* Read the function body for the function associated with NODE if possible.  */
+/* Read the function body for the function associated with NODE.  */
 
 static void
 lto_materialize_function (struct cgraph_node *node)
@@ -113,9 +117,11 @@ lto_materialize_function (struct cgraph_node *node)
 	 WPA mode, the body of the function is not needed.  */
       if (!flag_wpa)
 	{
-         allocate_struct_function (decl, false);
-	  announce_function (node->decl);
+	  allocate_struct_function (decl, false);
+	  announce_function (decl);
 	  lto_input_function_body (file_data, decl, data);
+	  if (DECL_FUNCTION_PERSONALITY (decl) && !first_personality_decl)
+	    first_personality_decl = DECL_FUNCTION_PERSONALITY (decl);
 	  lto_stats.num_function_bodies++;
 	}
 
@@ -1844,6 +1850,28 @@ do_whole_program_analysis (void)
 }
 
 
+static GTY(()) tree lto_eh_personality_decl;
+
+/* Return the LTO personality function decl.  */
+
+tree
+lto_eh_personality (void)
+{
+  if (!lto_eh_personality_decl)
+    {
+      /* Use the first personality DECL for our personality if we don't
+	 support multiple ones.  This ensures that we don't artificially
+	 create the need for them in a single-language program.  */
+      if (first_personality_decl && !dwarf2out_do_cfi_asm ())
+	lto_eh_personality_decl = first_personality_decl;
+      else
+	lto_eh_personality_decl = lhd_gcc_personality ();
+    }
+
+  return lto_eh_personality_decl;
+}
+
+
 /* Main entry point for the GIMPLE front end.  This front end has
    three main personalities:
 
diff --git a/gcc/lto/lto.h b/gcc/lto/lto.h
index 7f8e108..cdd30d6 100644
--- a/gcc/lto/lto.h
+++ b/gcc/lto/lto.h
@@ -36,6 +36,7 @@ typedef struct lto_file_struct
 extern const char *resolution_file_name;
 
 /* In lto.c  */
+extern tree lto_eh_personality (void);
 extern void lto_main (int);
 extern void lto_read_all_file_options (void);