Reland and fix "Allow ICs to be generated for own global proxy."

src/code-stubs.h

 // 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 945 matching lines @@
   STATIC_ASSERT(KindBits::kSize == 4);
   class InobjectBits: public BitField<bool, 4, 1> {};
   class IndexBits: public BitField<int, 5, 11> {};
   class UnboxedDoubleBits: public BitField<bool, 16, 1> {};
   virtual CodeStub::Major MajorKey() { return LoadField; }
 };
 
 
 class StoreGlobalStub : public HandlerStub {
  public:
-  explicit StoreGlobalStub(bool is_constant) {
-    bit_field_ = IsConstantBits::encode(is_constant);
+  explicit StoreGlobalStub(bool is_constant, bool check_global) {
+    bit_field_ = IsConstantBits::encode(is_constant) |
+        CheckGlobalBits::encode(check_global);
+  }
+
+  static Handle<HeapObject> global_placeholder(Isolate* isolate) {
+    return isolate->factory()->uninitialized_value();
   }
 
   Handle<Code> GetCodeCopyFromTemplate(Isolate* isolate,
-                                       Map* receiver_map,
+                                       GlobalObject* global,
                                        PropertyCell* cell) {
     Handle<Code> code = CodeStub::GetCodeCopyFromTemplate(isolate);
-    // Replace the placeholder cell and global object map with the actual global
-    // cell and receiver map.
+    if (check_global()) {
+      // Replace the placeholder cell and global object map with the actual
+      // global cell and receiver map.
+      code->ReplaceNthObject(1, global_placeholder(isolate)->map(), global);
+      code->ReplaceNthObject(1, isolate->heap()->meta_map(), global->map());
+    }
     Map* cell_map = isolate->heap()->global_property_cell_map();
     code->ReplaceNthObject(1, cell_map, cell);
-    code->ReplaceNthObject(1, isolate->heap()->meta_map(), receiver_map);
     return code;
   }
 
   virtual Code::Kind kind() const { return Code::STORE_IC; }
 
   virtual Handle<Code> GenerateCode(Isolate* isolate);
 
   virtual void InitializeInterfaceDescriptor(
       Isolate* isolate,
       CodeStubInterfaceDescriptor* descriptor);
 
-  bool is_constant() {
+  bool is_constant() const {
     return IsConstantBits::decode(bit_field_);
   }
+  bool check_global() const {
+    return CheckGlobalBits::decode(bit_field_);
+  }
   void set_is_constant(bool value) {
     bit_field_ = IsConstantBits::update(bit_field_, value);
   }
 
   Representation representation() {
     return Representation::FromKind(RepresentationBits::decode(bit_field_));
   }
   void set_representation(Representation r) {
     bit_field_ = RepresentationBits::update(bit_field_, r.kind());
   }
 
  private:
   Major MajorKey() { return StoreGlobal; }
 
   class IsConstantBits: public BitField<bool, 0, 1> {};
   class RepresentationBits: public BitField<Representation::Kind, 1, 8> {};
+  class CheckGlobalBits: public BitField<bool, 9, 1> {};
 
   DISALLOW_COPY_AND_ASSIGN(StoreGlobalStub);
 };
 
 
 class CallApiFunctionStub : public PlatformCodeStub {
  public:
   CallApiFunctionStub(bool is_store,
                       bool call_data_undefined,
                       int argc) {
@@ skipping 1459 matching lines @@
 
 
 class CallDescriptors {
  public:
   static void InitializeForIsolate(Isolate* isolate);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_