Make maps in monomorphic IC stubs weak.

src/code-stubs.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 54 matching lines @@
 SmartArrayPointer<const char> CodeStub::GetName() {
   char buffer[100];
   NoAllocationStringAllocator allocator(buffer,
                                         static_cast<unsigned>(sizeof(buffer)));
   StringStream stream(&allocator);
   PrintName(&stream);
   return stream.ToCString();
 }
 
 
-void CodeStub::RecordCodeGeneration(Code* code, Isolate* isolate) {
+void CodeStub::RecordCodeGeneration(Handle<Code> code, Isolate* isolate) {
+  IC::RegisterWeakMapDependency(code);
   SmartArrayPointer<const char> name = GetName();
-  PROFILE(isolate, CodeCreateEvent(Logger::STUB_TAG, code, name.get()));
-  GDBJIT(AddCode(GDBJITInterface::STUB, name.get(), code));
+  PROFILE(isolate, CodeCreateEvent(Logger::STUB_TAG, *code, name.get()));
+  GDBJIT(AddCode(GDBJITInterface::STUB, name.get(), *code));
   Counters* counters = isolate->counters();
   counters->total_stubs_code_size()->Increment(code->instruction_size());
 }
 
 
 Code::Kind CodeStub::GetCodeKind() const {
   return Code::STUB;
 }
 
 
 Handle<Code> CodeStub::GetCodeCopy(Isolate* isolate,
                                    const Code::FindAndReplacePattern& pattern) {
   Handle<Code> ic = GetCode(isolate);
   ic = isolate->factory()->CopyCode(ic);
   ic->FindAndReplace(pattern);
-  RecordCodeGeneration(*ic, isolate);
+  RecordCodeGeneration(ic, isolate);
   return ic;
 }
 
 
 Handle<Code> PlatformCodeStub::GenerateCode(Isolate* isolate) {
   Factory* factory = isolate->factory();
 
   // Generate the new code.
   MacroAssembler masm(isolate, NULL, 256);
 
@@ skipping 42 matching lines @@
 #ifdef DEBUG
   VerifyPlatformFeatures(isolate);
 #endif
 
   {
     HandleScope scope(isolate);
 
     Handle<Code> new_object = GenerateCode(isolate);
     new_object->set_major_key(MajorKey());
     FinishCode(new_object);
-    RecordCodeGeneration(*new_object, isolate);
+    RecordCodeGeneration(new_object, isolate);
 
 #ifdef ENABLE_DISASSEMBLER
     if (FLAG_print_code_stubs) {
       CodeTracer::Scope trace_scope(isolate->GetCodeTracer());
       new_object->Disassemble(GetName().get(), trace_scope.file());
       PrintF(trace_scope.file(), "\n");
     }
 #endif
 
     if (UseSpecialCache()) {
@@ skipping 647 matching lines @@
   InstallDescriptor(isolate, &stub3);
 }
 
 InternalArrayConstructorStub::InternalArrayConstructorStub(
     Isolate* isolate) {
   InternalArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
 }
 
 
 } }  // namespace v8::internal