Add flag trap_on_stub_deopt. We want to be able to trap on hydrogen stub bailouts.

BUG=
R=svenpanne@chromium.org, verwaest@chromium.org

Review URL: https://codereview.chromium.org/22593003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16121 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/lithium-codegen-arm.cc

@@ -811,7 +811,7 @@ void LCodeGen::DeoptimizeIf(Condition cc,
     return;
   }
 
-  if (FLAG_trap_on_deopt && info()->IsOptimizing()) {
+  if (info()->ShouldTrapOnDeopt()) {
     __ stop("trap_on_deopt", cc);
   }
 

src/compiler.h

@@ -199,6 +199,11 @@ class CompilationInfo {
     return IsCompilingForDebugging::decode(flags_);
   }
 
+  bool ShouldTrapOnDeopt() const {
+    return (FLAG_trap_on_deopt && IsOptimizing()) ||
+        (FLAG_trap_on_stub_deopt && IsStub());
+  }
+
   bool has_global_object() const {
     return !closure().is_null() &&
         (closure()->context()->global_object() != NULL);

src/flag-definitions.h

@@ -264,6 +264,8 @@ DEFINE_int(deopt_every_n_garbage_collections,
            "deoptimize every n garbage collections")
 DEFINE_bool(print_deopt_stress, false, "print number of possible deopt points")
 DEFINE_bool(trap_on_deopt, false, "put a break point before deoptimizing")
+DEFINE_bool(trap_on_stub_deopt, false,
+            "put a break point before deoptimizing a stub")
 DEFINE_bool(deoptimize_uncommon_cases, true, "deoptimize uncommon cases")
 DEFINE_bool(polymorphic_inlining, true, "polymorphic inlining")
 DEFINE_bool(use_osr, true, "use on-stack replacement")

src/ia32/lithium-codegen-ia32.cc

@@ -1010,7 +1010,7 @@ void LCodeGen::DeoptimizeIf(Condition cc,
     __ bind(&done);
   }
 
-  if (FLAG_trap_on_deopt && info()->IsOptimizing()) {
+  if (info()->ShouldTrapOnDeopt()) {
     Label done;
     if (cc != no_condition) __ j(NegateCondition(cc), &done, Label::kNear);
     __ int3();

src/mips/lithium-codegen-mips.cc

@@ -787,7 +787,7 @@ void LCodeGen::DeoptimizeIf(Condition cc,
     return;
   }
 
-  if (FLAG_trap_on_deopt && info()->IsOptimizing()) {
+  if (info()->ShouldTrapOnDeopt()) {
     Label skip;
     if (cc != al) {
       __ Branch(&skip, NegateCondition(cc), src1, src2);

src/x64/lithium-codegen-x64.cc

@@ -693,7 +693,7 @@ void LCodeGen::DeoptimizeIf(Condition cc,
 
   ASSERT(FLAG_deopt_every_n_times == 0);  // Not yet implemented on x64.
 
-  if (FLAG_trap_on_deopt && info()->IsOptimizing()) {
+  if (info()->ShouldTrapOnDeopt()) {
     Label done;
     if (cc != no_condition) {
       __ j(NegateCondition(cc), &done, Label::kNear);