invoke.texi (-fisolate-erroneous-paths): Document.

	* doc/invoke.texi (-fisolate-erroneous-paths): Document.

	* gimple-ssa-isolate-paths.c (gate_isolate_erroneous_paths):
	No longer check if we have __builtin_trap, assume it's
	available.

java/

	* builtins.c (initialize_builtins): Provide __builtin_trap.

From-SVN: r204533

gcc/ChangeLog

+2013-11-07  Jeff Law  <law@redhat.com>
+
+	* doc/invoke.texi (-fisolate-erroneous-paths): Document.
+
+	* gimple-ssa-isolate-paths.c (gate_isolate_erroneous_paths):
+	No longer check if we have __builtin_trap, assume it's
+	available.
+
 2013-11-07  Thomas Schwinge  <thomas@codesourcery.com>
 
 	* doc/sourcebuild.texi (Top Level) <lto-plugin>: GNU ld can use

gcc/doc/invoke.texi

@@ -377,6 +377,7 @@ Objective-C and Objective-C++ Dialects}.
 -fira-region=@var{region} -fira-hoist-pressure @gol
 -fira-loop-pressure -fno-ira-share-save-slots @gol
 -fno-ira-share-spill-slots -fira-verbose=@var{n} @gol
+-fisolate-erroneous-paths
 -fivopts -fkeep-inline-functions -fkeep-static-consts -flive-range-shrinkage @gol
 -floop-block -floop-interchange -floop-strip-mine -floop-nest-optimize @gol
 -floop-parallelize-all -flto -flto-compression-level @gol
@@ -6742,6 +6743,7 @@ also turns on the following optimization flags:
 -finline-small-functions @gol
 -findirect-inlining @gol
 -fipa-sra @gol
+-fisolate-erroneous-paths @gol
 -foptimize-sibling-calls @gol
 -fpartial-inlining @gol
 -fpeephole2 @gol
@@ -7635,6 +7637,11 @@ it may significantly increase code size
 (see @option{--param ipcp-unit-growth=@var{value}}).
 This flag is enabled by default at @option{-O3}.
 
+@item -fisolate-erroneous-paths
+Detect paths which trigger erroneous or undefined behaviour.  Isolate those
+paths from the main control flow and turn the statement with erroneous or
+undefined behaviour into a trap.
+
 @item -ftree-sink
 @opindex ftree-sink
 Perform forward store motion  on trees.  This flag is

gcc/gimple-ssa-isolate-paths.c

@@ -283,8 +283,7 @@ gate_isolate_erroneous_paths (void)
 {
   /* If we do not have a suitable builtin function for the trap statement,
      then do not perform the optimization.  */
-  return (flag_isolate_erroneous_paths != 0
-	  && builtin_decl_explicit (BUILT_IN_TRAP) != NULL);
+  return (flag_isolate_erroneous_paths != 0);
 }
 
 namespace {

gcc/java/ChangeLog

+2013-11-07  Jeff Law  <law@redhat.com>
+
+	* builtins.c (initialize_builtins): Provide __builtin_trap.
+
 2013-10-29  David Malcolm  <dmalcolm@redhat.com>
 
 	Patch autogenerated by refactor_symtab.py from

gcc/java/builtins.c

@@ -579,7 +579,9 @@ initialize_builtins (void)
   define_builtin (BUILT_IN_RETURN_ADDRESS, "__builtin_return_address",
 		  build_function_type_list (ptr_type_node, int_type_node, NULL_TREE),
 		  "__builtin_return_address", ECF_NOTHROW | ECF_LEAF);
-
+  define_builtin (BUILT_IN_TRAP, "__builtin_trap",
+		  build_function_type_list (void_type_node, NULL_TREE),
+		  "__builtin_trap", ECF_NOTHROW | ECF_LEAF | ECF_NORETURN);
   build_common_builtin_nodes ();
 }