Remove IC age from Code.

BUG=

Review URL: https://codereview.chromium.org/879693004

Cr-Commit-Position: refs/heads/master@{#26468}

diff --git a/src/factory.cc b/src/factory.cc
index ef695cf..b3779f2 100644 (file)
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1457,7 +1457,6 @@ Handle<Code> Factory::NewCode(const CodeDesc& desc,
   // fact that no allocation will happen from this point on.
   DisallowHeapAllocation no_gc;
   code->set_gc_metadata(Smi::FromInt(0));
-  code->set_ic_age(isolate()->heap()->global_ic_age());
   code->set_instruction_size(desc.instr_size);
   code->set_relocation_info(*reloc_info);
   code->set_flags(flags);

diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 0742aaf..9f07bda 100644 (file)
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -3653,7 +3653,6 @@ AllocationResult Heap::AllocateCode(int object_size, bool immovable) {
   DCHECK(isolate_->code_range() == NULL || !isolate_->code_range()->valid() ||
          isolate_->code_range()->contains(code->address()));
   code->set_gc_metadata(Smi::FromInt(0));
-  code->set_ic_age(global_ic_age_);
   return code;
 }
 

diff --git a/src/heap/objects-visiting-inl.h b/src/heap/objects-visiting-inl.h
index abdccc2..810b38b 100644 (file)
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -262,8 +262,7 @@ void StaticMarkingVisitor<StaticVisitor>::VisitCodeTarget(Heap* heap,
   // when they might be keeping a Context alive, or when the heap is about
   // to be serialized.
   if (FLAG_cleanup_code_caches_at_gc && target->is_inline_cache_stub() &&
-      !target->is_call_stub() && (heap->isolate()->serializer_enabled() ||
-                                  target->ic_age() != heap->global_ic_age())) {
+      !target->is_call_stub() && heap->isolate()->serializer_enabled()) {
     ICUtility::Clear(heap->isolate(), rinfo->pc(),
                      rinfo->host()->constant_pool());
     target = Code::GetCodeFromTargetAddress(rinfo->target_address());

diff --git a/src/objects-inl.h b/src/objects-inl.h
index 9e9bd59..13f8427 100644 (file)
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -6451,7 +6451,6 @@ void Code::set_stub_key(uint32_t key) {
 
 
 ACCESSORS(Code, gc_metadata, Object, kGCMetadataOffset)
-INT_ACCESSORS(Code, ic_age, kICAgeOffset)
 
 
 byte* Code::instruction_start()  {

diff --git a/src/objects.cc b/src/objects.cc
index e8a9454..cfd1878 100644 (file)
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -10342,10 +10342,6 @@ void JSFunction::StartInobjectSlackTracking() {
 
 
 void SharedFunctionInfo::ResetForNewContext(int new_ic_age) {
-  code()->ClearInlineCaches();
-  // If we clear ICs, we need to clear the type feedback vector too, since
-  // CallICs are synced with a feedback vector slot.
-  ClearTypeFeedbackInfo();
   set_ic_age(new_ic_age);
   if (code()->kind() == Code::FUNCTION) {
     code()->set_profiler_ticks(0);

diff --git a/src/objects.h b/src/objects.h
index b49efaa..06c490c 100644 (file)
--- a/src/objects.h
+++ b/src/objects.h
@@ -5051,11 +5051,6 @@ class Code: public HeapObject {
   // it is only used by the garbage collector itself.
   DECL_ACCESSORS(gc_metadata, Object)
 
-  // [ic_age]: Inline caching age: the value of the Heap::global_ic_age
-  // at the moment when this object was created.
-  inline void set_ic_age(int count);
-  inline int ic_age() const;
-
   // [prologue_offset]: Offset of the function prologue, used for aging
   // FUNCTIONs and OPTIMIZED_FUNCTIONs.
   inline int prologue_offset() const;
@@ -5411,17 +5406,15 @@ class Code: public HeapObject {
       kDeoptimizationDataOffset + kPointerSize;
   static const int kNextCodeLinkOffset = kTypeFeedbackInfoOffset + kPointerSize;
   static const int kGCMetadataOffset = kNextCodeLinkOffset + kPointerSize;
-  static const int kInstructionSizeOffset = kGCMetadataOffset + kPointerSize;
-  static const int kICAgeOffset = kInstructionSizeOffset + kIntSize;
-  static const int kFlagsOffset = kICAgeOffset + kIntSize;
+  static const int kConstantPoolOffset = kGCMetadataOffset + kPointerSize;
+  static const int kInstructionSizeOffset = kConstantPoolOffset + kPointerSize;
+  static const int kFlagsOffset = kInstructionSizeOffset + kIntSize;
   static const int kKindSpecificFlags1Offset = kFlagsOffset + kIntSize;
   static const int kKindSpecificFlags2Offset =
       kKindSpecificFlags1Offset + kIntSize;
   // Note: We might be able to squeeze this into the flags above.
   static const int kPrologueOffset = kKindSpecificFlags2Offset + kIntSize;
-  static const int kConstantPoolOffset = kPrologueOffset + kIntSize;
-
-  static const int kHeaderPaddingStart = kConstantPoolOffset + kPointerSize;
+  static const int kHeaderPaddingStart = kPrologueOffset + kIntSize;
 
   // Add padding to align the instruction start following right after
   // the Code object header.

diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index a64915f..4646f3d 100644 (file)
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -3393,15 +3393,6 @@ static void CheckVectorIC(Handle<JSFunction> f, int ic_slot_index,
 }
 
 
-static void CheckVectorICCleared(Handle<JSFunction> f, int ic_slot_index) {
-  Handle<TypeFeedbackVector> vector =
-      Handle<TypeFeedbackVector>(f->shared()->feedback_vector());
-  FeedbackVectorICSlot slot(ic_slot_index);
-  LoadICNexus nexus(vector, slot);
-  CHECK(IC::IsCleared(&nexus));
-}
-
-
 TEST(IncrementalMarkingPreservesMonomorphicIC) {
   if (i::FLAG_always_opt) return;
   CcTest::InitializeVM();
@@ -3437,50 +3428,6 @@ TEST(IncrementalMarkingPreservesMonomorphicIC) {
 }
 
 
-TEST(IncrementalMarkingClearsMonomorphicIC) {
-  if (i::FLAG_always_opt) return;
-  CcTest::InitializeVM();
-  v8::HandleScope scope(CcTest::isolate());
-  v8::Local<v8::Value> obj1;
-
-  {
-    LocalContext env;
-    CompileRun("function fun() { this.x = 1; }; var obj = new fun();");
-    obj1 = env->Global()->Get(v8_str("obj"));
-  }
-
-  // Prepare function f that contains a monomorphic IC for object
-  // originating from a different native context.
-  CcTest::global()->Set(v8_str("obj1"), obj1);
-  CompileRun("function f(o) { return o.x; } f(obj1); f(obj1);");
-  Handle<JSFunction> f =
-      v8::Utils::OpenHandle(
-          *v8::Handle<v8::Function>::Cast(
-              CcTest::global()->Get(v8_str("f"))));
-
-  Code* ic_before = FindFirstIC(f->shared()->code(), Code::LOAD_IC);
-  if (FLAG_vector_ics) {
-    CheckVectorIC(f, 0, MONOMORPHIC);
-    CHECK(ic_before->ic_state() == DEFAULT);
-  } else {
-    CHECK(ic_before->ic_state() == MONOMORPHIC);
-  }
-
-  // Fire context dispose notification.
-  CcTest::isolate()->ContextDisposedNotification();
-  SimulateIncrementalMarking(CcTest::heap());
-  CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
-
-  Code* ic_after = FindFirstIC(f->shared()->code(), Code::LOAD_IC);
-  if (FLAG_vector_ics) {
-    CheckVectorICCleared(f, 0);
-    CHECK(ic_after->ic_state() == DEFAULT);
-  } else {
-    CHECK(IC::IsCleared(ic_after));
-  }
-}
-
-
 TEST(IncrementalMarkingPreservesPolymorphicIC) {
   if (i::FLAG_always_opt) return;
   CcTest::InitializeVM();
@@ -3529,57 +3476,6 @@ TEST(IncrementalMarkingPreservesPolymorphicIC) {
 }
 
 
-TEST(IncrementalMarkingClearsPolymorphicIC) {
-  if (i::FLAG_always_opt) return;
-  CcTest::InitializeVM();
-  v8::HandleScope scope(CcTest::isolate());
-  v8::Local<v8::Value> obj1, obj2;
-
-  {
-    LocalContext env;
-    CompileRun("function fun() { this.x = 1; }; var obj = new fun();");
-    obj1 = env->Global()->Get(v8_str("obj"));
-  }
-
-  {
-    LocalContext env;
-    CompileRun("function fun() { this.x = 2; }; var obj = new fun();");
-    obj2 = env->Global()->Get(v8_str("obj"));
-  }
-
-  // Prepare function f that contains a polymorphic IC for objects
-  // originating from two different native contexts.
-  CcTest::global()->Set(v8_str("obj1"), obj1);
-  CcTest::global()->Set(v8_str("obj2"), obj2);
-  CompileRun("function f(o) { return o.x; } f(obj1); f(obj1); f(obj2);");
-  Handle<JSFunction> f =
-      v8::Utils::OpenHandle(
-          *v8::Handle<v8::Function>::Cast(
-              CcTest::global()->Get(v8_str("f"))));
-
-  Code* ic_before = FindFirstIC(f->shared()->code(), Code::LOAD_IC);
-  if (FLAG_vector_ics) {
-    CheckVectorIC(f, 0, POLYMORPHIC);
-    CHECK(ic_before->ic_state() == DEFAULT);
-  } else {
-    CHECK(ic_before->ic_state() == POLYMORPHIC);
-  }
-
-  // Fire context dispose notification.
-  CcTest::isolate()->ContextDisposedNotification();
-  SimulateIncrementalMarking(CcTest::heap());
-  CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
-
-  Code* ic_after = FindFirstIC(f->shared()->code(), Code::LOAD_IC);
-  if (FLAG_vector_ics) {
-    CheckVectorICCleared(f, 0);
-    CHECK(ic_before->ic_state() == DEFAULT);
-  } else {
-    CHECK(IC::IsCleared(ic_after));
-  }
-}
-
-
 class SourceResource : public v8::String::ExternalOneByteStringResource {
  public:
   explicit SourceResource(const char* data)