Avoid pre-aging when debugger is active

BUG=None
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/47023003

Patch from Ross McIlroy <rmcilroy@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17443 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/macro-assembler-arm.cc

@@ -35,6 +35,7 @@
 #include "codegen.h"
 #include "cpu-profiler.h"
 #include "debug.h"
+#include "isolate-inl.h"
 #include "runtime.h"
 
 namespace v8 {
@@ -926,7 +927,7 @@ void MacroAssembler::Prologue(PrologueFrameMode frame_mode) {
         this, kNoCodeAgeSequenceLength * Assembler::kInstrSize);
     // The following three instructions must remain together and unmodified
     // for code aging to work properly.
-    if (FLAG_optimize_for_size && FLAG_age_code) {
+    if (isolate()->IsCodePreAgingActive()) {
       // Pre-age the code.
       Code* stub = Code::GetPreAgedCodeAgeStub(isolate());
       add(r0, pc, Operand(-8));

src/ia32/macro-assembler-ia32.cc

@@ -33,6 +33,7 @@
 #include "codegen.h"
 #include "cpu-profiler.h"
 #include "debug.h"
+#include "isolate-inl.h"
 #include "runtime.h"
 #include "serialize.h"
 
@@ -1022,7 +1023,7 @@ void MacroAssembler::Prologue(PrologueFrameMode frame_mode) {
   } else {
     PredictableCodeSizeScope predictible_code_size_scope(this,
         kNoCodeAgeSequenceLength);
-    if (FLAG_optimize_for_size && FLAG_age_code) {
+    if (isolate()->IsCodePreAgingActive()) {
         // Pre-age the code.
       call(isolate()->builtins()->MarkCodeAsExecutedOnce(),
           RelocInfo::CODE_AGE_SEQUENCE);

src/isolate-inl.h

@@ -48,6 +48,11 @@ SaveContext::SaveContext(Isolate* isolate)
 }
 
 
+bool Isolate::IsCodePreAgingActive() {
+  return FLAG_optimize_for_size && FLAG_age_code && !IsDebuggerActive();
+}
+
+
 bool Isolate::IsDebuggerActive() {
 #ifdef ENABLE_DEBUGGER_SUPPORT
   if (!NoBarrier_Load(&debugger_initialized_)) return false;

src/isolate.h

@@ -994,6 +994,8 @@ class Isolate {
   void PreallocatedStorageDelete(void* p);
   void PreallocatedStorageInit(size_t size);
 
+  inline bool IsCodePreAgingActive();
+
 #ifdef ENABLE_DEBUGGER_SUPPORT
   Debugger* debugger() {
     if (!NoBarrier_Load(&debugger_initialized_)) InitializeDebugger();

src/mips/macro-assembler-mips.cc

@@ -35,6 +35,7 @@
 #include "codegen.h"
 #include "cpu-profiler.h"
 #include "debug.h"
+#include "isolate-inl.h"
 #include "runtime.h"
 
 namespace v8 {
@@ -4596,7 +4597,7 @@ void MacroAssembler::Prologue(PrologueFrameMode frame_mode) {
       this, kNoCodeAgeSequenceLength * Assembler::kInstrSize);
     // The following three instructions must remain together and unmodified
     // for code aging to work properly.
-    if (FLAG_optimize_for_size && FLAG_age_code) {
+    if (isolate()->IsCodePreAgingActive()) {
       // Pre-age the code.
       Code* stub = Code::GetPreAgedCodeAgeStub(isolate());
       nop(Assembler::CODE_AGE_MARKER_NOP);

src/x64/macro-assembler-x64.cc

@@ -37,6 +37,7 @@
 #include "serialize.h"
 #include "debug.h"
 #include "heap.h"
+#include "isolate-inl.h"
 
 namespace v8 {
 namespace internal {
@@ -3659,7 +3660,7 @@ void MacroAssembler::Prologue(PrologueFrameMode frame_mode) {
   } else {
     PredictableCodeSizeScope predictible_code_size_scope(this,
         kNoCodeAgeSequenceLength);
-    if (FLAG_optimize_for_size && FLAG_age_code) {
+    if (isolate()->IsCodePreAgingActive()) {
         // Pre-age the code.
       Call(isolate()->builtins()->MarkCodeAsExecutedOnce(),
            RelocInfo::CODE_AGE_SEQUENCE);