Merge (7265, 7271] from bleeding_edge to experimental/gc branch....

src/builtins.cc

 // Copyright 2006-2008 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 90 matching lines @@
 #endif
 
 
 #define DEF_ARG_TYPE(name, spec)                      \
   typedef BuiltinArguments<spec> name##ArgumentsType;
 BUILTIN_LIST_C(DEF_ARG_TYPE)
 #undef DEF_ARG_TYPE
 
 }  // namespace
 
-
 // ----------------------------------------------------------------------------
 // Support macro for defining builtins in C++.
 // ----------------------------------------------------------------------------
 //
 // A builtin function is defined by writing:
 //
 //   BUILTIN(name) {
 //     ...
 //   }
 //
 // In the body of the builtin function the arguments can be accessed
 // through the BuiltinArguments object args.
 
 #ifdef DEBUG
 
-#define BUILTIN(name)                                                \
-  MUST_USE_RESULT static MaybeObject* Builtin_Impl_##name(           \
-      name##ArgumentsType args);                                     \
-  MUST_USE_RESULT static MaybeObject* Builtin_##name(                \
-      name##ArgumentsType args) {     \
-    args.Verify();                                                   \
-    return Builtin_Impl_##name(args);                                \
-  }                                                                  \
-  MUST_USE_RESULT static MaybeObject* Builtin_Impl_##name(           \
-    name##ArgumentsType args)
+#define BUILTIN(name)                                      \
+  MUST_USE_RESULT static MaybeObject* Builtin_Impl_##name( \
+      name##ArgumentsType args, Isolate* isolate);         \
+  MUST_USE_RESULT static MaybeObject* Builtin_##name(      \
+      name##ArgumentsType args, Isolate* isolate) {        \
+    ASSERT(isolate == Isolate::Current());                 \
+    args.Verify();                                         \
+    return Builtin_Impl_##name(args, isolate);             \
+  }                                                        \
+  MUST_USE_RESULT static MaybeObject* Builtin_Impl_##name( \
+      name##ArgumentsType args, Isolate* isolate)
 
 #else  // For release mode.
 
-#define BUILTIN(name)                                                \
-  static MaybeObject* Builtin_##name(name##ArgumentsType args)
+#define BUILTIN(name)                                      \
+  static MaybeObject* Builtin_##name(name##ArgumentsType args, Isolate* isolate)
 
 #endif
 
 
-static inline bool CalledAsConstructor() {
+static inline bool CalledAsConstructor(Isolate* isolate) {
 #ifdef DEBUG
   // Calculate the result using a full stack frame iterator and check
   // that the state of the stack is as we assume it to be in the
   // code below.
   StackFrameIterator it;
   ASSERT(it.frame()->is_exit());
   it.Advance();
   StackFrame* frame = it.frame();
   bool reference_result = frame->is_construct();
 #endif
-  Address fp = Top::c_entry_fp(Top::GetCurrentThread());
+  Address fp = Isolate::c_entry_fp(isolate->thread_local_top());
   // Because we know fp points to an exit frame we can use the relevant
   // part of ExitFrame::ComputeCallerState directly.
   const int kCallerOffset = ExitFrameConstants::kCallerFPOffset;
   Address caller_fp = Memory::Address_at(fp + kCallerOffset);
   // This inlines the part of StackFrame::ComputeType that grabs the
   // type of the current frame.  Note that StackFrame::ComputeType
   // has been specialized for each architecture so if any one of them
   // changes this code has to be changed as well.
   const int kMarkerOffset = StandardFrameConstants::kMarkerOffset;
   const Smi* kConstructMarker = Smi::FromInt(StackFrame::CONSTRUCT);
   Object* marker = Memory::Object_at(caller_fp + kMarkerOffset);
   bool result = (marker == kConstructMarker);
   ASSERT_EQ(result, reference_result);
   return result;
 }
 
 // ----------------------------------------------------------------------------
 
-
 BUILTIN(Illegal) {
   UNREACHABLE();
-  return Heap::undefined_value();  // Make compiler happy.
+  return isolate->heap()->undefined_value();  // Make compiler happy.
 }
 
 
 BUILTIN(EmptyFunction) {
-  return Heap::undefined_value();
+  return isolate->heap()->undefined_value();
 }
 
 
 BUILTIN(ArrayCodeGeneric) {
-  Counters::array_function_runtime.Increment();
+  Heap* heap = isolate->heap();
+  isolate->counters()->array_function_runtime()->Increment();
 
   JSArray* array;
-  if (CalledAsConstructor()) {
+  if (CalledAsConstructor(isolate)) {
     array = JSArray::cast(*args.receiver());
   } else {
     // Allocate the JS Array
     JSFunction* constructor =
-        Top::context()->global_context()->array_function();
+        isolate->context()->global_context()->array_function();
     Object* obj;
-    { MaybeObject* maybe_obj = Heap::AllocateJSObject(constructor);
+    { MaybeObject* maybe_obj = heap->AllocateJSObject(constructor);
       if (!maybe_obj->ToObject(&obj)) return maybe_obj;
     }
     array = JSArray::cast(obj);
   }
 
   // 'array' now contains the JSArray we should initialize.
   ASSERT(array->HasFastElements());
 
   // Optimize the case where there is one argument and the argument is a
   // small smi.
   if (args.length() == 2) {
     Object* obj = args[1];
     if (obj->IsSmi()) {
       int len = Smi::cast(obj)->value();
       if (len >= 0 && len < JSObject::kInitialMaxFastElementArray) {
         Object* obj;
-        { MaybeObject* maybe_obj = Heap::AllocateFixedArrayWithHoles(len);
+        { MaybeObject* maybe_obj = heap->AllocateFixedArrayWithHoles(len);
           if (!maybe_obj->ToObject(&obj)) return maybe_obj;
         }
         array->SetContent(FixedArray::cast(obj));
         return array;
       }
     }
     // Take the argument as the length.
     { MaybeObject* maybe_obj = array->Initialize(0);
       if (!maybe_obj->ToObject(&obj)) return maybe_obj;
     }
     return array->SetElementsLength(args[1]);
   }
 
   // Optimize the case where there are no parameters passed.
   if (args.length() == 1) {
     return array->Initialize(JSArray::kPreallocatedArrayElements);
   }
 
   // Take the arguments as elements.
   int number_of_elements = args.length() - 1;
   Smi* len = Smi::FromInt(number_of_elements);
   Object* obj;
-  { MaybeObject* maybe_obj = Heap::AllocateFixedArrayWithHoles(len->value());
+  { MaybeObject* maybe_obj = heap->AllocateFixedArrayWithHoles(len->value());
     if (!maybe_obj->ToObject(&obj)) return maybe_obj;
   }
 
   AssertNoAllocation no_gc;
   FixedArray* elms = FixedArray::cast(obj);
   WriteBarrierMode mode = elms->GetWriteBarrierMode(no_gc);
   // Fill in the content
   for (int index = 0; index < number_of_elements; index++) {
     elms->set(index, args[index+1], mode);
   }
 
   // Set length and elements on the array.
   array->set_elements(FixedArray::cast(obj));
   array->set_length(len);
 
   return array;
 }
 
 
-MUST_USE_RESULT static MaybeObject* AllocateJSArray() {
+MUST_USE_RESULT static MaybeObject* AllocateJSArray(Heap* heap) {
   JSFunction* array_function =
-      Top::context()->global_context()->array_function();
+      heap->isolate()->context()->global_context()->array_function();
   Object* result;
-  { MaybeObject* maybe_result = Heap::AllocateJSObject(array_function);
+  { MaybeObject* maybe_result = heap->AllocateJSObject(array_function);
     if (!maybe_result->ToObject(&result)) return maybe_result;
   }
   return result;
 }
 
 
-MUST_USE_RESULT static MaybeObject* AllocateEmptyJSArray() {
+MUST_USE_RESULT static MaybeObject* AllocateEmptyJSArray(Heap* heap) {
   Object* result;
-  { MaybeObject* maybe_result = AllocateJSArray();
+  { MaybeObject* maybe_result = AllocateJSArray(heap);
     if (!maybe_result->ToObject(&result)) return maybe_result;
   }
   JSArray* result_array = JSArray::cast(result);
   result_array->set_length(Smi::FromInt(0));
-  result_array->set_elements(Heap::empty_fixed_array());
+  result_array->set_elements(heap->empty_fixed_array());
   return result_array;
 }
 
 
-static void CopyElements(AssertNoAllocation* no_gc,
+static void CopyElements(Heap* heap,
+                         AssertNoAllocation* no_gc,
                          FixedArray* dst,
                          int dst_index,
                          FixedArray* src,
                          int src_index,
                          int len) {
   ASSERT(dst != src);  // Use MoveElements instead.
-  ASSERT(dst->map() != Heap::fixed_cow_array_map());
+  ASSERT(dst->map() != HEAP->fixed_cow_array_map());
   ASSERT(len > 0);
   CopyWords(dst->data_start() + dst_index,
             src->data_start() + src_index,
             len);
   WriteBarrierMode mode = dst->GetWriteBarrierMode(*no_gc);
   if (mode == UPDATE_WRITE_BARRIER) {
-    Heap::RecordWrites(dst->address(), dst->OffsetOfElementAt(dst_index), len);
+    heap->RecordWrites(dst->address(), dst->OffsetOfElementAt(dst_index), len);
   }
-  IncrementalMarking::RecordWrites(dst);
+  heap->incremental_marking()->RecordWrites(dst);
 }
 
 
-static void MoveElements(AssertNoAllocation* no_gc,
+static void MoveElements(Heap* heap,
+                         AssertNoAllocation* no_gc,
                          FixedArray* dst,
                          int dst_index,
                          FixedArray* src,
                          int src_index,
                          int len) {
-  ASSERT(dst->map() != Heap::fixed_cow_array_map());
+  ASSERT(dst->map() != HEAP->fixed_cow_array_map());
   memmove(dst->data_start() + dst_index,
           src->data_start() + src_index,
           len * kPointerSize);
   WriteBarrierMode mode = dst->GetWriteBarrierMode(*no_gc);
   if (mode == UPDATE_WRITE_BARRIER) {
-    Heap::RecordWrites(dst->address(), dst->OffsetOfElementAt(dst_index), len);
+    heap->RecordWrites(dst->address(), dst->OffsetOfElementAt(dst_index), len);
   }
-  IncrementalMarking::RecordWrites(dst);
+  heap->incremental_marking()->RecordWrites(dst);
 }
 
 
-static void FillWithHoles(FixedArray* dst, int from, int to) {
-  ASSERT(dst->map() != Heap::fixed_cow_array_map());
-  MemsetPointer(dst->data_start() + from, Heap::the_hole_value(), to - from);
+static void FillWithHoles(Heap* heap, FixedArray* dst, int from, int to) {
+  ASSERT(dst->map() != heap->fixed_cow_array_map());
+  MemsetPointer(dst->data_start() + from, heap->the_hole_value(), to - from);
 }
 
 
-static FixedArray* LeftTrimFixedArray(FixedArray* elms, int to_trim) {
-  ASSERT(elms->map() != Heap::fixed_cow_array_map());
+static FixedArray* LeftTrimFixedArray(Heap* heap,
+                                      FixedArray* elms,
+                                      int to_trim) {
+  ASSERT(elms->map() != HEAP->fixed_cow_array_map());
   // For now this trick is only applied to fixed arrays in new and paged space.
   // In large object space the object's start must coincide with chunk
   // and thus the trick is just not applicable.
-  ASSERT(!Heap::lo_space()->Contains(elms));
+  ASSERT(!HEAP->lo_space()->Contains(elms));
 
   STATIC_ASSERT(FixedArray::kMapOffset == 0);
   STATIC_ASSERT(FixedArray::kLengthOffset == kPointerSize);
   STATIC_ASSERT(FixedArray::kHeaderSize == 2 * kPointerSize);
 
   Object** former_start = HeapObject::RawField(elms, 0);
 
   const int len = elms->length();
 
   if (to_trim > FixedArray::kHeaderSize / kPointerSize &&
-      !Heap::new_space()->Contains(elms)) {
+      !heap->new_space()->Contains(elms)) {
     // If we are doing a big trim in old space then we zap the space that was
     // formerly part of the array so that the GC (aided by the card-based
     // remembered set) won't find pointers to new-space there.
     Object** zap = reinterpret_cast<Object**>(elms->address());
     zap++;  // Header of filler must be at least one word so skip that.
     for (int i = 1; i < to_trim; i++) {
       *zap++ = Smi::FromInt(0);
     }
   }
   // Technically in new space this write might be omitted (except for
   // debug mode which iterates through the heap), but to play safer
   // we still do it.
-  Heap::CreateFillerObjectAt(elms->address(), to_trim * kPointerSize);
+  heap->CreateFillerObjectAt(elms->address(), to_trim * kPointerSize);
 
-  former_start[to_trim] = Heap::fixed_array_map();
+  former_start[to_trim] = heap->fixed_array_map();
   former_start[to_trim + 1] = Smi::FromInt(len - to_trim);
 
   // Maintain marking consistency for HeapObjectIterator and
   // IncrementalMarking.
-  Marking::TransferMark(elms->address(),
-                        elms->address() + to_trim * kPointerSize);
+  heap->marking()->TransferMark(elms->address(),
+                                elms->address() + to_trim * kPointerSize);
 
   return FixedArray::cast(HeapObject::FromAddress(
       elms->address() + to_trim * kPointerSize));
 }
 
 
-static bool ArrayPrototypeHasNoElements(Context* global_context,
+static bool ArrayPrototypeHasNoElements(Heap* heap,
+                                        Context* global_context,
                                         JSObject* array_proto) {
   // This method depends on non writability of Object and Array prototype
   // fields.
-  if (array_proto->elements() != Heap::empty_fixed_array()) return false;
+  if (array_proto->elements() != heap->empty_fixed_array()) return false;
   // Hidden prototype
   array_proto = JSObject::cast(array_proto->GetPrototype());
-  ASSERT(array_proto->elements() == Heap::empty_fixed_array());
+  ASSERT(array_proto->elements() == heap->empty_fixed_array());
   // Object.prototype
   Object* proto = array_proto->GetPrototype();
-  if (proto == Heap::null_value()) return false;
+  if (proto == heap->null_value()) return false;
   array_proto = JSObject::cast(proto);
   if (array_proto != global_context->initial_object_prototype()) return false;
-  if (array_proto->elements() != Heap::empty_fixed_array()) return false;
+  if (array_proto->elements() != heap->empty_fixed_array()) return false;
   ASSERT(array_proto->GetPrototype()->IsNull());
   return true;
 }
 
 
 MUST_USE_RESULT
 static inline MaybeObject* EnsureJSArrayWithWritableFastElements(
-    Object* receiver) {
+    Heap* heap, Object* receiver) {
   if (!receiver->IsJSArray()) return NULL;
   JSArray* array = JSArray::cast(receiver);
   HeapObject* elms = array->elements();
-  if (elms->map() == Heap::fixed_array_map()) return elms;
-  if (elms->map() == Heap::fixed_cow_array_map()) {
+  if (elms->map() == heap->fixed_array_map()) return elms;
+  if (elms->map() == heap->fixed_cow_array_map()) {
     return array->EnsureWritableFastElements();
   }
   return NULL;
 }
 
 
-static inline bool IsJSArrayFastElementMovingAllowed(JSArray* receiver) {
-  Context* global_context = Top::context()->global_context();
+static inline bool IsJSArrayFastElementMovingAllowed(Heap* heap,
+                                                     JSArray* receiver) {
+  Context* global_context = heap->isolate()->context()->global_context();
   JSObject* array_proto =
       JSObject::cast(global_context->array_function()->prototype());
   return receiver->GetPrototype() == array_proto &&
-         ArrayPrototypeHasNoElements(global_context, array_proto);
+         ArrayPrototypeHasNoElements(heap, global_context, array_proto);
 }
 
 
 MUST_USE_RESULT static MaybeObject* CallJsBuiltin(
+    Isolate* isolate,
     const char* name,
     BuiltinArguments<NO_EXTRA_ARGUMENTS> args) {
-  HandleScope handleScope;
+  HandleScope handleScope(isolate);
 
   Handle<Object> js_builtin =
-      GetProperty(Handle<JSObject>(Top::global_context()->builtins()),
-                  name);
+      GetProperty(Handle<JSObject>(
+          isolate->global_context()->builtins()),
+          name);
   ASSERT(js_builtin->IsJSFunction());
   Handle<JSFunction> function(Handle<JSFunction>::cast(js_builtin));
   ScopedVector<Object**> argv(args.length() - 1);
   int n_args = args.length() - 1;
   for (int i = 0; i < n_args; i++) {
     argv[i] = args.at<Object>(i + 1).location();
   }
   bool pending_exception = false;
   Handle<Object> result = Execution::Call(function,
                                           args.receiver(),
                                           n_args,
                                           argv.start(),
                                           &pending_exception);
   if (pending_exception) return Failure::Exception();
   return *result;
 }
 
 
 BUILTIN(ArrayPush) {
+  Heap* heap = isolate->heap();
   Object* receiver = *args.receiver();
   Object* elms_obj;
   { MaybeObject* maybe_elms_obj =
-        EnsureJSArrayWithWritableFastElements(receiver);
-    if (maybe_elms_obj == NULL) return CallJsBuiltin("ArrayPush", args);
+        EnsureJSArrayWithWritableFastElements(heap, receiver);
+    if (maybe_elms_obj == NULL) {
+      return CallJsBuiltin(isolate, "ArrayPush", args);
+    }
     if (!maybe_elms_obj->ToObject(&elms_obj)) return maybe_elms_obj;
   }
   FixedArray* elms = FixedArray::cast(elms_obj);
   JSArray* array = JSArray::cast(receiver);
 
   int len = Smi::cast(array->length())->value();
   int to_add = args.length() - 1;
   if (to_add == 0) {
     return Smi::FromInt(len);
   }
   // Currently fixed arrays cannot grow too big, so
   // we should never hit this case.
   ASSERT(to_add <= (Smi::kMaxValue - len));
 
   int new_length = len + to_add;
 
   if (new_length > elms->length()) {
     // New backing storage is needed.
     int capacity = new_length + (new_length >> 1) + 16;
     Object* obj;
-    { MaybeObject* maybe_obj = Heap::AllocateUninitializedFixedArray(capacity);
+    { MaybeObject* maybe_obj = heap->AllocateUninitializedFixedArray(capacity);
       if (!maybe_obj->ToObject(&obj)) return maybe_obj;
     }
     FixedArray* new_elms = FixedArray::cast(obj);
 
     AssertNoAllocation no_gc;
     if (len > 0) {
-      CopyElements(&no_gc, new_elms, 0, elms, 0, len);
+      CopyElements(heap, &no_gc, new_elms, 0, elms, 0, len);
     }
-    FillWithHoles(new_elms, new_length, capacity);
+    FillWithHoles(heap, new_elms, new_length, capacity);
 
     elms = new_elms;
     array->set_elements(elms);
   }
 
   // Add the provided values.
   AssertNoAllocation no_gc;
   WriteBarrierMode mode = elms->GetWriteBarrierMode(no_gc);
   for (int index = 0; index < to_add; index++) {
     elms->set(index + len, args[index + 1], mode);
   }
 
   // Set the length.
   array->set_length(Smi::FromInt(new_length));
   return Smi::FromInt(new_length);
 }
 
 
 BUILTIN(ArrayPop) {
+  Heap* heap = isolate->heap();
   Object* receiver = *args.receiver();
   Object* elms_obj;
   { MaybeObject* maybe_elms_obj =
-        EnsureJSArrayWithWritableFastElements(receiver);
-    if (maybe_elms_obj == NULL) return CallJsBuiltin("ArrayPop", args);
+        EnsureJSArrayWithWritableFastElements(heap, receiver);
+    if (maybe_elms_obj == NULL) return CallJsBuiltin(isolate, "ArrayPop", args);
     if (!maybe_elms_obj->ToObject(&elms_obj)) return maybe_elms_obj;
   }
   FixedArray* elms = FixedArray::cast(elms_obj);
   JSArray* array = JSArray::cast(receiver);
 
   int len = Smi::cast(array->length())->value();
-  if (len == 0) return Heap::undefined_value();
+  if (len == 0) return heap->undefined_value();
 
   // Get top element
   MaybeObject* top = elms->get(len - 1);
 
   // Set the length.
   array->set_length(Smi::FromInt(len - 1));
 
   if (!top->IsTheHole()) {
     // Delete the top element.
     elms->set_the_hole(len - 1);
     return top;
   }
 
   top = array->GetPrototype()->GetElement(len - 1);
 
   return top;
 }
 
 
 BUILTIN(ArrayShift) {
+  Heap* heap = isolate->heap();
   Object* receiver = *args.receiver();
   Object* elms_obj;
   { MaybeObject* maybe_elms_obj =
-        EnsureJSArrayWithWritableFastElements(receiver);
-    if (maybe_elms_obj == NULL) return CallJsBuiltin("ArrayShift", args);
+        EnsureJSArrayWithWritableFastElements(heap, receiver);
+    if (maybe_elms_obj == NULL)
+        return CallJsBuiltin(isolate, "ArrayShift", args);
     if (!maybe_elms_obj->ToObject(&elms_obj)) return maybe_elms_obj;
   }
-  if (!IsJSArrayFastElementMovingAllowed(JSArray::cast(receiver))) {
-    return CallJsBuiltin("ArrayShift", args);
+  if (!IsJSArrayFastElementMovingAllowed(heap, JSArray::cast(receiver))) {
+    return CallJsBuiltin(isolate, "ArrayShift", args);
   }
   FixedArray* elms = FixedArray::cast(elms_obj);
   JSArray* array = JSArray::cast(receiver);
   ASSERT(array->HasFastElements());
 
   int len = Smi::cast(array->length())->value();
-  if (len == 0) return Heap::undefined_value();
+  if (len == 0) return heap->undefined_value();
 
   // Get first element
   Object* first = elms->get(0);
   if (first->IsTheHole()) {
-    first = Heap::undefined_value();
+    first = heap->undefined_value();
   }
 
-  if (!Heap::lo_space()->Contains(elms)) {
+  if (!heap->lo_space()->Contains(elms)) {
     // As elms still in the same space they used to be,
     // there is no need to update region dirty mark.
-    array->set_elements(LeftTrimFixedArray(elms, 1), SKIP_WRITE_BARRIER);
+    array->set_elements(LeftTrimFixedArray(heap, elms, 1), SKIP_WRITE_BARRIER);
   } else {
     // Shift the elements.
     AssertNoAllocation no_gc;
-    MoveElements(&no_gc, elms, 0, elms, 1, len - 1);
-    elms->set(len - 1, Heap::the_hole_value());
+    MoveElements(heap, &no_gc, elms, 0, elms, 1, len - 1);
+    elms->set(len - 1, heap->the_hole_value());
   }
 
   // Set the length.
   array->set_length(Smi::FromInt(len - 1));
 
   return first;
 }
 
 
 BUILTIN(ArrayUnshift) {
+  Heap* heap = isolate->heap();
   Object* receiver = *args.receiver();
   Object* elms_obj;
   { MaybeObject* maybe_elms_obj =
-        EnsureJSArrayWithWritableFastElements(receiver);
-    if (maybe_elms_obj == NULL) return CallJsBuiltin("ArrayUnshift", args);
+        EnsureJSArrayWithWritableFastElements(heap, receiver);
+    if (maybe_elms_obj == NULL)
+        return CallJsBuiltin(isolate, "ArrayUnshift", args);
     if (!maybe_elms_obj->ToObject(&elms_obj)) return maybe_elms_obj;
   }
-  if (!IsJSArrayFastElementMovingAllowed(JSArray::cast(receiver))) {
-    return CallJsBuiltin("ArrayUnshift", args);
+  if (!IsJSArrayFastElementMovingAllowed(heap, JSArray::cast(receiver))) {
+    return CallJsBuiltin(isolate, "ArrayUnshift", args);
   }
   FixedArray* elms = FixedArray::cast(elms_obj);
   JSArray* array = JSArray::cast(receiver);
   ASSERT(array->HasFastElements());
 
   int len = Smi::cast(array->length())->value();
   int to_add = args.length() - 1;
   int new_length = len + to_add;
   // Currently fixed arrays cannot grow too big, so
   // we should never hit this case.
   ASSERT(to_add <= (Smi::kMaxValue - len));
 
   if (new_length > elms->length()) {
     // New backing storage is needed.
     int capacity = new_length + (new_length >> 1) + 16;
     Object* obj;
-    { MaybeObject* maybe_obj = Heap::AllocateUninitializedFixedArray(capacity);
+    { MaybeObject* maybe_obj = heap->AllocateUninitializedFixedArray(capacity);
       if (!maybe_obj->ToObject(&obj)) return maybe_obj;
     }
     FixedArray* new_elms = FixedArray::cast(obj);
 
     AssertNoAllocation no_gc;
     if (len > 0) {
-      CopyElements(&no_gc, new_elms, to_add, elms, 0, len);
+      CopyElements(heap, &no_gc, new_elms, to_add, elms, 0, len);
     }
-    FillWithHoles(new_elms, new_length, capacity);
+    FillWithHoles(heap, new_elms, new_length, capacity);
 
     elms = new_elms;
     array->set_elements(elms);
   } else {
     AssertNoAllocation no_gc;
-    MoveElements(&no_gc, elms, to_add, elms, 0, len);
+    MoveElements(heap, &no_gc, elms, to_add, elms, 0, len);
   }
 
   // Add the provided values.
   AssertNoAllocation no_gc;
   WriteBarrierMode mode = elms->GetWriteBarrierMode(no_gc);
   for (int i = 0; i < to_add; i++) {
     elms->set(i, args[i + 1], mode);
   }
 
   // Set the length.
   array->set_length(Smi::FromInt(new_length));
   return Smi::FromInt(new_length);
 }
 
 
 BUILTIN(ArraySlice) {
+  Heap* heap = isolate->heap();
   Object* receiver = *args.receiver();
   FixedArray* elms;
   int len = -1;
   if (receiver->IsJSArray()) {
     JSArray* array = JSArray::cast(receiver);
     if (!array->HasFastElements() ||
-        !IsJSArrayFastElementMovingAllowed(array)) {
-      return CallJsBuiltin("ArraySlice", args);
+        !IsJSArrayFastElementMovingAllowed(heap, array)) {
+      return CallJsBuiltin(isolate, "ArraySlice", args);
     }
 
     elms = FixedArray::cast(array->elements());
     len = Smi::cast(array->length())->value();
   } else {
     // Array.slice(arguments, ...) is quite a common idiom (notably more
     // than 50% of invocations in Web apps).  Treat it in C++ as well.
     Map* arguments_map =
-        Top::context()->global_context()->arguments_boilerplate()->map();
+        isolate->context()->global_context()->arguments_boilerplate()->map();
 
     bool is_arguments_object_with_fast_elements =
         receiver->IsJSObject()
         && JSObject::cast(receiver)->map() == arguments_map
         && JSObject::cast(receiver)->HasFastElements();
     if (!is_arguments_object_with_fast_elements) {
-      return CallJsBuiltin("ArraySlice", args);
+      return CallJsBuiltin(isolate, "ArraySlice", args);
     }
     elms = FixedArray::cast(JSObject::cast(receiver)->elements());
     Object* len_obj = JSObject::cast(receiver)
         ->InObjectPropertyAt(Heap::kArgumentsLengthIndex);
     if (!len_obj->IsSmi()) {
-      return CallJsBuiltin("ArraySlice", args);
+      return CallJsBuiltin(isolate, "ArraySlice", args);
     }
     len = Smi::cast(len_obj)->value();
     if (len > elms->length()) {
-      return CallJsBuiltin("ArraySlice", args);
+      return CallJsBuiltin(isolate, "ArraySlice", args);
     }
     for (int i = 0; i < len; i++) {
-      if (elms->get(i) == Heap::the_hole_value()) {
-        return CallJsBuiltin("ArraySlice", args);
+      if (elms->get(i) == heap->the_hole_value()) {
+        return CallJsBuiltin(isolate, "ArraySlice", args);
       }
     }
   }
   ASSERT(len >= 0);
   int n_arguments = args.length() - 1;
 
   // Note carefully choosen defaults---if argument is missing,
   // it's undefined which gets converted to 0 for relative_start
   // and to len for relative_end.
   int relative_start = 0;
   int relative_end = len;
   if (n_arguments > 0) {
     Object* arg1 = args[1];
     if (arg1->IsSmi()) {
       relative_start = Smi::cast(arg1)->value();
     } else if (!arg1->IsUndefined()) {
-      return CallJsBuiltin("ArraySlice", args);
+      return CallJsBuiltin(isolate, "ArraySlice", args);
     }
     if (n_arguments > 1) {
       Object* arg2 = args[2];
       if (arg2->IsSmi()) {
         relative_end = Smi::cast(arg2)->value();
       } else if (!arg2->IsUndefined()) {
-        return CallJsBuiltin("ArraySlice", args);
+        return CallJsBuiltin(isolate, "ArraySlice", args);
       }
     }
   }
 
   // ECMAScript 232, 3rd Edition, Section 15.4.4.10, step 6.
   int k = (relative_start < 0) ? Max(len + relative_start, 0)
                                : Min(relative_start, len);
 
   // ECMAScript 232, 3rd Edition, Section 15.4.4.10, step 8.
   int final = (relative_end < 0) ? Max(len + relative_end, 0)
                                  : Min(relative_end, len);
 
   // Calculate the length of result array.
   int result_len = final - k;
   if (result_len <= 0) {
-    return AllocateEmptyJSArray();
+    return AllocateEmptyJSArray(heap);
   }
 
   Object* result;
-  { MaybeObject* maybe_result = AllocateJSArray();
+  { MaybeObject* maybe_result = AllocateJSArray(heap);
     if (!maybe_result->ToObject(&result)) return maybe_result;
   }
   JSArray* result_array = JSArray::cast(result);
 
   { MaybeObject* maybe_result =
-        Heap::AllocateUninitializedFixedArray(result_len);
+        heap->AllocateUninitializedFixedArray(result_len);
     if (!maybe_result->ToObject(&result)) return maybe_result;
   }
   FixedArray* result_elms = FixedArray::cast(result);
 
   AssertNoAllocation no_gc;
-  CopyElements(&no_gc, result_elms, 0, elms, k, result_len);
+  CopyElements(heap, &no_gc, result_elms, 0, elms, k, result_len);
 
   // Set elements.
   result_array->set_elements(result_elms);
 
   // Set the length.
   result_array->set_length(Smi::FromInt(result_len));
   return result_array;
 }
 
 
 BUILTIN(ArraySplice) {
+  Heap* heap = isolate->heap();
   Object* receiver = *args.receiver();
   Object* elms_obj;
   { MaybeObject* maybe_elms_obj =
-        EnsureJSArrayWithWritableFastElements(receiver);
-    if (maybe_elms_obj == NULL) return CallJsBuiltin("ArraySplice", args);
+        EnsureJSArrayWithWritableFastElements(heap, receiver);
+    if (maybe_elms_obj == NULL)
+        return CallJsBuiltin(isolate, "ArraySplice", args);
     if (!maybe_elms_obj->ToObject(&elms_obj)) return maybe_elms_obj;
   }
-  if (!IsJSArrayFastElementMovingAllowed(JSArray::cast(receiver))) {
-    return CallJsBuiltin("ArraySplice", args);
+  if (!IsJSArrayFastElementMovingAllowed(heap, JSArray::cast(receiver))) {
+    return CallJsBuiltin(isolate, "ArraySplice", args);
   }
   FixedArray* elms = FixedArray::cast(elms_obj);
   JSArray* array = JSArray::cast(receiver);
   ASSERT(array->HasFastElements());
 
   int len = Smi::cast(array->length())->value();
 
   int n_arguments = args.length() - 1;
 
   int relative_start = 0;
   if (n_arguments > 0) {
     Object* arg1 = args[1];
     if (arg1->IsSmi()) {
       relative_start = Smi::cast(arg1)->value();
     } else if (!arg1->IsUndefined()) {
-      return CallJsBuiltin("ArraySplice", args);
+      return CallJsBuiltin(isolate, "ArraySplice", args);
     }
   }
   int actual_start = (relative_start < 0) ? Max(len + relative_start, 0)
                                           : Min(relative_start, len);
 
   // SpiderMonkey, TraceMonkey and JSC treat the case where no delete count is
   // given as a request to delete all the elements from the start.
   // And it differs from the case of undefined delete count.
   // This does not follow ECMA-262, but we do the same for
   // compatibility.
   int actual_delete_count;
   if (n_arguments == 1) {
     ASSERT(len - actual_start >= 0);
     actual_delete_count = len - actual_start;
   } else {
     int value = 0;  // ToInteger(undefined) == 0
     if (n_arguments > 1) {
       Object* arg2 = args[2];
       if (arg2->IsSmi()) {
         value = Smi::cast(arg2)->value();
       } else {
-        return CallJsBuiltin("ArraySplice", args);
+        return CallJsBuiltin(isolate, "ArraySplice", args);
       }
     }
     actual_delete_count = Min(Max(value, 0), len - actual_start);
   }
 
   JSArray* result_array = NULL;
   if (actual_delete_count == 0) {
     Object* result;
-    { MaybeObject* maybe_result = AllocateEmptyJSArray();
+    { MaybeObject* maybe_result = AllocateEmptyJSArray(heap);
       if (!maybe_result->ToObject(&result)) return maybe_result;
     }
     result_array = JSArray::cast(result);
   } else {
     // Allocate result array.
     Object* result;
-    { MaybeObject* maybe_result = AllocateJSArray();
+    { MaybeObject* maybe_result = AllocateJSArray(heap);
       if (!maybe_result->ToObject(&result)) return maybe_result;
     }
     result_array = JSArray::cast(result);
 
     { MaybeObject* maybe_result =
-          Heap::AllocateUninitializedFixedArray(actual_delete_count);
+          heap->AllocateUninitializedFixedArray(actual_delete_count);
       if (!maybe_result->ToObject(&result)) return maybe_result;
     }
     FixedArray* result_elms = FixedArray::cast(result);
 
     AssertNoAllocation no_gc;
     // Fill newly created array.
-    CopyElements(&no_gc,
+    CopyElements(heap,
+                 &no_gc,
                  result_elms, 0,
                  elms, actual_start,
                  actual_delete_count);
 
     // Set elements.
     result_array->set_elements(result_elms);
 
     // Set the length.
     result_array->set_length(Smi::FromInt(actual_delete_count));
   }
 
   int item_count = (n_arguments > 1) ? (n_arguments - 2) : 0;
 
   int new_length = len - actual_delete_count + item_count;
 
   if (item_count < actual_delete_count) {
     // Shrink the array.
-    const bool trim_array = !Heap::lo_space()->Contains(elms) &&
+    const bool trim_array = !heap->lo_space()->Contains(elms) &&
       ((actual_start + item_count) <
           (len - actual_delete_count - actual_start));
     if (trim_array) {
       const int delta = actual_delete_count - item_count;
 
       if (actual_start > 0) {
         Object** start = elms->data_start();
         memmove(start + delta, start, actual_start * kPointerSize);
       }
 
-      elms = LeftTrimFixedArray(elms, delta);
+      elms = LeftTrimFixedArray(heap, elms, delta);
       array->set_elements(elms, SKIP_WRITE_BARRIER);
     } else {
       AssertNoAllocation no_gc;
-      MoveElements(&no_gc,
+      MoveElements(heap, &no_gc,
                    elms, actual_start + item_count,
                    elms, actual_start + actual_delete_count,
                    (len - actual_delete_count - actual_start));
-      FillWithHoles(elms, new_length, len);
+      FillWithHoles(heap, elms, new_length, len);
     }
   } else if (item_count > actual_delete_count) {
     // Currently fixed arrays cannot grow too big, so
     // we should never hit this case.
     ASSERT((item_count - actual_delete_count) <= (Smi::kMaxValue - len));
 
     // Check if array need to grow.
     if (new_length > elms->length()) {
       // New backing storage is needed.
       int capacity = new_length + (new_length >> 1) + 16;
       Object* obj;
       { MaybeObject* maybe_obj =
-            Heap::AllocateUninitializedFixedArray(capacity);
+            heap->AllocateUninitializedFixedArray(capacity);
         if (!maybe_obj->ToObject(&obj)) return maybe_obj;
       }
       FixedArray* new_elms = FixedArray::cast(obj);
 
       AssertNoAllocation no_gc;
       // Copy the part before actual_start as is.
       if (actual_start > 0) {
-        CopyElements(&no_gc, new_elms, 0, elms, 0, actual_start);
+        CopyElements(heap, &no_gc, new_elms, 0, elms, 0, actual_start);
       }
       const int to_copy = len - actual_delete_count - actual_start;
       if (to_copy > 0) {
-        CopyElements(&no_gc,
+        CopyElements(heap, &no_gc,
                      new_elms, actual_start + item_count,
                      elms, actual_start + actual_delete_count,
                      to_copy);
       }
-      FillWithHoles(new_elms, new_length, capacity);
+      FillWithHoles(heap, new_elms, new_length, capacity);
 
       elms = new_elms;
       array->set_elements(elms);
     } else {
       AssertNoAllocation no_gc;
-      MoveElements(&no_gc,
+      MoveElements(heap, &no_gc,
                    elms, actual_start + item_count,
                    elms, actual_start + actual_delete_count,
                    (len - actual_delete_count - actual_start));
     }
   }
 
   AssertNoAllocation no_gc;
   WriteBarrierMode mode = elms->GetWriteBarrierMode(no_gc);
   for (int k = actual_start; k < actual_start + item_count; k++) {
     elms->set(k, args[3 + k - actual_start], mode);
   }
 
   // Set the length.
   array->set_length(Smi::FromInt(new_length));
 
   return result_array;
 }
 
 
 BUILTIN(ArrayConcat) {
-  Context* global_context = Top::context()->global_context();
+  Heap* heap = isolate->heap();
+  Context* global_context = isolate->context()->global_context();
   JSObject* array_proto =
       JSObject::cast(global_context->array_function()->prototype());
-  if (!ArrayPrototypeHasNoElements(global_context, array_proto)) {
-    return CallJsBuiltin("ArrayConcat", args);
+  if (!ArrayPrototypeHasNoElements(heap, global_context, array_proto)) {
+    return CallJsBuiltin(isolate, "ArrayConcat", args);
   }
 
   // Iterate through all the arguments performing checks
   // and calculating total length.
   int n_arguments = args.length();
   int result_len = 0;
   for (int i = 0; i < n_arguments; i++) {
     Object* arg = args[i];
     if (!arg->IsJSArray() || !JSArray::cast(arg)->HasFastElements()
         || JSArray::cast(arg)->GetPrototype() != array_proto) {
-      return CallJsBuiltin("ArrayConcat", args);
+      return CallJsBuiltin(isolate, "ArrayConcat", args);
     }
 
     int len = Smi::cast(JSArray::cast(arg)->length())->value();
 
     // We shouldn't overflow when adding another len.
     const int kHalfOfMaxInt = 1 << (kBitsPerInt - 2);
     STATIC_ASSERT(FixedArray::kMaxLength < kHalfOfMaxInt);
     USE(kHalfOfMaxInt);
     result_len += len;
     ASSERT(result_len >= 0);
 
     if (result_len > FixedArray::kMaxLength) {
-      return CallJsBuiltin("ArrayConcat", args);
+      return CallJsBuiltin(isolate, "ArrayConcat", args);
     }
   }
 
   if (result_len == 0) {
-    return AllocateEmptyJSArray();
+    return AllocateEmptyJSArray(heap);
   }
 
   // Allocate result.
   Object* result;
-  { MaybeObject* maybe_result = AllocateJSArray();
+  { MaybeObject* maybe_result = AllocateJSArray(heap);
     if (!maybe_result->ToObject(&result)) return maybe_result;
   }
   JSArray* result_array = JSArray::cast(result);
 
   { MaybeObject* maybe_result =
-        Heap::AllocateUninitializedFixedArray(result_len);
+        heap->AllocateUninitializedFixedArray(result_len);
     if (!maybe_result->ToObject(&result)) return maybe_result;
   }
   FixedArray* result_elms = FixedArray::cast(result);
 
   // Copy data.
   AssertNoAllocation no_gc;
   int start_pos = 0;
   for (int i = 0; i < n_arguments; i++) {
     JSArray* array = JSArray::cast(args[i]);
     int len = Smi::cast(array->length())->value();
     if (len > 0) {
       FixedArray* elms = FixedArray::cast(array->elements());
-      CopyElements(&no_gc, result_elms, start_pos, elms, 0, len);
+      CopyElements(heap, &no_gc, result_elms, start_pos, elms, 0, len);
       start_pos += len;
     }
   }
   ASSERT(start_pos == result_len);
 
   // Set the length and elements.
   result_array->set_length(Smi::FromInt(result_len));
   result_array->set_elements(result_elms);
 
   return result_array;
 }
 
 
 // -----------------------------------------------------------------------------
 // Strict mode poison pills
 
 
 BUILTIN(StrictArgumentsCallee) {
   HandleScope scope;
-  return Top::Throw(*Factory::NewTypeError("strict_arguments_callee",
-                                           HandleVector<Object>(NULL, 0)));
+  return isolate->Throw(*isolate->factory()->NewTypeError(
+      "strict_arguments_callee", HandleVector<Object>(NULL, 0)));
 }
 
 
 BUILTIN(StrictArgumentsCaller) {
   HandleScope scope;
-  return Top::Throw(*Factory::NewTypeError("strict_arguments_caller",
-                                           HandleVector<Object>(NULL, 0)));
+  return isolate->Throw(*isolate->factory()->NewTypeError(
+      "strict_arguments_caller", HandleVector<Object>(NULL, 0)));
 }
 
 
 BUILTIN(StrictFunctionCaller) {
   HandleScope scope;
-  return Top::Throw(*Factory::NewTypeError("strict_function_caller",
-                                            HandleVector<Object>(NULL, 0)));
+  return isolate->Throw(*isolate->factory()->NewTypeError(
+      "strict_function_caller", HandleVector<Object>(NULL, 0)));
 }
 
 
 BUILTIN(StrictFunctionArguments) {
   HandleScope scope;
-  return Top::Throw(*Factory::NewTypeError("strict_function_arguments",
-                                            HandleVector<Object>(NULL, 0)));
+  return isolate->Throw(*isolate->factory()->NewTypeError(
+      "strict_function_arguments", HandleVector<Object>(NULL, 0)));
 }
 
 
 // -----------------------------------------------------------------------------
 //
 
 
 // Returns the holder JSObject if the function can legally be called
 // with this receiver.  Returns Heap::null_value() if the call is
 // illegal.  Any arguments that don't fit the expected type is
 // overwritten with undefined.  Arguments that do fit the expected
 // type is overwritten with the object in the prototype chain that
 // actually has that type.
-static inline Object* TypeCheck(int argc,
+static inline Object* TypeCheck(Heap* heap,
+                                int argc,
                                 Object** argv,
                                 FunctionTemplateInfo* info) {
   Object* recv = argv[0];
   Object* sig_obj = info->signature();
   if (sig_obj->IsUndefined()) return recv;
   SignatureInfo* sig = SignatureInfo::cast(sig_obj);
   // If necessary, check the receiver
   Object* recv_type = sig->receiver();
 
   Object* holder = recv;
   if (!recv_type->IsUndefined()) {
-    for (; holder != Heap::null_value(); holder = holder->GetPrototype()) {
+    for (; holder != heap->null_value(); holder = holder->GetPrototype()) {
       if (holder->IsInstanceOf(FunctionTemplateInfo::cast(recv_type))) {
         break;
       }
     }
-    if (holder == Heap::null_value()) return holder;
+    if (holder == heap->null_value()) return holder;
   }
   Object* args_obj = sig->args();
   // If there is no argument signature we're done
   if (args_obj->IsUndefined()) return holder;
   FixedArray* args = FixedArray::cast(args_obj);
   int length = args->length();
   if (argc <= length) length = argc - 1;
   for (int i = 0; i < length; i++) {
     Object* argtype = args->get(i);
     if (argtype->IsUndefined()) continue;
     Object** arg = &argv[-1 - i];
     Object* current = *arg;
-    for (; current != Heap::null_value(); current = current->GetPrototype()) {
+    for (; current != heap->null_value(); current = current->GetPrototype()) {
       if (current->IsInstanceOf(FunctionTemplateInfo::cast(argtype))) {
         *arg = current;
         break;
       }
     }
-    if (current == Heap::null_value()) *arg = Heap::undefined_value();
+    if (current == heap->null_value()) *arg = heap->undefined_value();
   }
   return holder;
 }
 
 
 template <bool is_construct>
 MUST_USE_RESULT static MaybeObject* HandleApiCallHelper(
-    BuiltinArguments<NEEDS_CALLED_FUNCTION> args) {
-  ASSERT(is_construct == CalledAsConstructor());
+    BuiltinArguments<NEEDS_CALLED_FUNCTION> args, Isolate* isolate) {
+  ASSERT(is_construct == CalledAsConstructor(isolate));
+  Heap* heap = isolate->heap();
 
-  HandleScope scope;
+  HandleScope scope(isolate);
   Handle<JSFunction> function = args.called_function();
   ASSERT(function->shared()->IsApiFunction());
 
   FunctionTemplateInfo* fun_data = function->shared()->get_api_func_data();
   if (is_construct) {
-    Handle<FunctionTemplateInfo> desc(fun_data);
+    Handle<FunctionTemplateInfo> desc(fun_data, isolate);
     bool pending_exception = false;
-    Factory::ConfigureInstance(desc, Handle<JSObject>::cast(args.receiver()),
-                               &pending_exception);
-    ASSERT(Top::has_pending_exception() == pending_exception);
+    isolate->factory()->ConfigureInstance(
+        desc, Handle<JSObject>::cast(args.receiver()), &pending_exception);
+    ASSERT(isolate->has_pending_exception() == pending_exception);
     if (pending_exception) return Failure::Exception();
     fun_data = *desc;
   }
 
-  Object* raw_holder = TypeCheck(args.length(), &args[0], fun_data);
+  Object* raw_holder = TypeCheck(heap, args.length(), &args[0], fun_data);
 
   if (raw_holder->IsNull()) {
     // This function cannot be called with the given receiver.  Abort!
     Handle<Object> obj =
-        Factory::NewTypeError("illegal_invocation", HandleVector(&function, 1));
-    return Top::Throw(*obj);
+        isolate->factory()->NewTypeError(
+            "illegal_invocation", HandleVector(&function, 1));
+    return isolate->Throw(*obj);
   }
 
   Object* raw_call_data = fun_data->call_code();
   if (!raw_call_data->IsUndefined()) {
     CallHandlerInfo* call_data = CallHandlerInfo::cast(raw_call_data);
     Object* callback_obj = call_data->callback();
     v8::InvocationCallback callback =
         v8::ToCData<v8::InvocationCallback>(callback_obj);
     Object* data_obj = call_data->data();
     Object* result;
 
-    LOG(ApiObjectAccess("call", JSObject::cast(*args.receiver())));
+    LOG(isolate, ApiObjectAccess("call", JSObject::cast(*args.receiver())));
     ASSERT(raw_holder->IsJSObject());
 
-    CustomArguments custom;
+    CustomArguments custom(isolate);
     v8::ImplementationUtilities::PrepareArgumentsData(custom.end(),
         data_obj, *function, raw_holder);
 
     v8::Arguments new_args = v8::ImplementationUtilities::NewArguments(
         custom.end(),
         &args[0] - 1,
         args.length() - 1,
         is_construct);
 
     v8::Handle<v8::Value> value;
     {
       // Leaving JavaScript.
-      VMState state(EXTERNAL);
-      ExternalCallbackScope call_scope(v8::ToCData<Address>(callback_obj));
+      VMState state(isolate, EXTERNAL);
+      ExternalCallbackScope call_scope(isolate,
+                                       v8::ToCData<Address>(callback_obj));
       value = callback(new_args);
     }
     if (value.IsEmpty()) {
-      result = Heap::undefined_value();
+      result = heap->undefined_value();
     } else {
       result = *reinterpret_cast<Object**>(*value);
     }
 
-    RETURN_IF_SCHEDULED_EXCEPTION();
+    RETURN_IF_SCHEDULED_EXCEPTION(isolate);
     if (!is_construct || result->IsJSObject()) return result;
   }
 
   return *args.receiver();
 }
 
 
 BUILTIN(HandleApiCall) {
-  return HandleApiCallHelper<false>(args);
+  return HandleApiCallHelper<false>(args, isolate);
 }
 
 
 BUILTIN(HandleApiCallConstruct) {
-  return HandleApiCallHelper<true>(args);
+  return HandleApiCallHelper<true>(args, isolate);
 }
 
 
 #ifdef DEBUG
 
 static void VerifyTypeCheck(Handle<JSObject> object,
                             Handle<JSFunction> function) {
   ASSERT(function->shared()->IsApiFunction());
   FunctionTemplateInfo* info = function->shared()->get_api_func_data();
   if (info->signature()->IsUndefined()) return;
   SignatureInfo* signature = SignatureInfo::cast(info->signature());
   Object* receiver_type = signature->receiver();
   if (receiver_type->IsUndefined()) return;
   FunctionTemplateInfo* type = FunctionTemplateInfo::cast(receiver_type);
   ASSERT(object->IsInstanceOf(type));
 }
 
 #endif
 
 
 BUILTIN(FastHandleApiCall) {
-  ASSERT(!CalledAsConstructor());
+  ASSERT(!CalledAsConstructor(isolate));
+  Heap* heap = isolate->heap();
   const bool is_construct = false;
 
   // We expect four more arguments: callback, function, call data, and holder.
   const int args_length = args.length() - 4;
   ASSERT(args_length >= 0);
 
   Object* callback_obj = args[args_length];
 
   v8::Arguments new_args = v8::ImplementationUtilities::NewArguments(
       &args[args_length + 1],
       &args[0] - 1,
       args_length - 1,
       is_construct);
 
 #ifdef DEBUG
   VerifyTypeCheck(Utils::OpenHandle(*new_args.Holder()),
                   Utils::OpenHandle(*new_args.Callee()));
 #endif
-  HandleScope scope;
+  HandleScope scope(isolate);
   Object* result;
   v8::Handle<v8::Value> value;
   {
     // Leaving JavaScript.
-    VMState state(EXTERNAL);
-    ExternalCallbackScope call_scope(v8::ToCData<Address>(callback_obj));
+    VMState state(isolate, EXTERNAL);
+    ExternalCallbackScope call_scope(isolate,
+                                     v8::ToCData<Address>(callback_obj));
     v8::InvocationCallback callback =
         v8::ToCData<v8::InvocationCallback>(callback_obj);
 
     value = callback(new_args);
   }
   if (value.IsEmpty()) {
-    result = Heap::undefined_value();
+    result = heap->undefined_value();
   } else {
     result = *reinterpret_cast<Object**>(*value);
   }
 
-  RETURN_IF_SCHEDULED_EXCEPTION();
+  RETURN_IF_SCHEDULED_EXCEPTION(isolate);
   return result;
 }
 
 
 // Helper function to handle calls to non-function objects created through the
 // API. The object can be called as either a constructor (using new) or just as
 // a function (without new).
 MUST_USE_RESULT static MaybeObject* HandleApiCallAsFunctionOrConstructor(
+    Isolate* isolate,
     bool is_construct_call,
     BuiltinArguments<NO_EXTRA_ARGUMENTS> args) {
   // Non-functions are never called as constructors. Even if this is an object
   // called as a constructor the delegate call is not a construct call.
-  ASSERT(!CalledAsConstructor());
+  ASSERT(!CalledAsConstructor(isolate));
+  Heap* heap = isolate->heap();
 
   Handle<Object> receiver = args.at<Object>(0);
 
   // Get the object called.
   JSObject* obj = JSObject::cast(*args.receiver());
 
   // Get the invocation callback from the function descriptor that was
   // used to create the called object.
   ASSERT(obj->map()->has_instance_call_handler());
   JSFunction* constructor = JSFunction::cast(obj->map()->constructor());
   ASSERT(constructor->shared()->IsApiFunction());
   Object* handler =
       constructor->shared()->get_api_func_data()->instance_call_handler();
   ASSERT(!handler->IsUndefined());
   CallHandlerInfo* call_data = CallHandlerInfo::cast(handler);
   Object* callback_obj = call_data->callback();
   v8::InvocationCallback callback =
       v8::ToCData<v8::InvocationCallback>(callback_obj);
 
   // Get the data for the call and perform the callback.
   Object* result;
   {
-    HandleScope scope;
+    HandleScope scope(isolate);
+    LOG(isolate, ApiObjectAccess("call non-function", obj));
 
-    LOG(ApiObjectAccess("call non-function", obj));
-
-    CustomArguments custom;
+    CustomArguments custom(isolate);
     v8::ImplementationUtilities::PrepareArgumentsData(custom.end(),
         call_data->data(), constructor, obj);
     v8::Arguments new_args = v8::ImplementationUtilities::NewArguments(
         custom.end(),
         &args[0] - 1,
         args.length() - 1,
         is_construct_call);
     v8::Handle<v8::Value> value;
     {
       // Leaving JavaScript.
-      VMState state(EXTERNAL);
-      ExternalCallbackScope call_scope(v8::ToCData<Address>(callback_obj));
+      VMState state(isolate, EXTERNAL);
+      ExternalCallbackScope call_scope(isolate,
+                                       v8::ToCData<Address>(callback_obj));
       value = callback(new_args);
     }
     if (value.IsEmpty()) {
-      result = Heap::undefined_value();
+      result = heap->undefined_value();
     } else {
       result = *reinterpret_cast<Object**>(*value);
     }
   }
   // Check for exceptions and return result.
-  RETURN_IF_SCHEDULED_EXCEPTION();
+  RETURN_IF_SCHEDULED_EXCEPTION(isolate);
   return result;
 }
 
 
 // Handle calls to non-function objects created through the API. This delegate
 // function is used when the call is a normal function call.
 BUILTIN(HandleApiCallAsFunction) {
-  return HandleApiCallAsFunctionOrConstructor(false, args);
+  return HandleApiCallAsFunctionOrConstructor(isolate, false, args);
 }
 
 
 // Handle calls to non-function objects created through the API. This delegate
 // function is used when the call is a construct call.
 BUILTIN(HandleApiCallAsConstructor) {
-  return HandleApiCallAsFunctionOrConstructor(true, args);
+  return HandleApiCallAsFunctionOrConstructor(isolate, true, args);
 }
 
 
 static void Generate_LoadIC_ArrayLength(MacroAssembler* masm) {
   LoadIC::GenerateArrayLength(masm);
 }
 
 
 static void Generate_LoadIC_StringLength(MacroAssembler* masm) {
   LoadIC::GenerateStringLength(masm, false);
@@ skipping 188 matching lines @@
 static void Generate_PlainReturn_LiveEdit(MacroAssembler* masm) {
   Debug::GeneratePlainReturnLiveEdit(masm);
 }
 
 
 static void Generate_FrameDropper_LiveEdit(MacroAssembler* masm) {
   Debug::GenerateFrameDropperLiveEdit(masm);
 }
 #endif
 
-Object* Builtins::builtins_[builtin_count] = { NULL, };
-const char* Builtins::names_[builtin_count] = { NULL, };
+
+Builtins::Builtins() : initialized_(false) {
+  memset(builtins_, 0, sizeof(builtins_[0]) * builtin_count);
+  memset(names_, 0, sizeof(names_[0]) * builtin_count);
+}
+
+
+Builtins::~Builtins() {
+}
+
 
 #define DEF_ENUM_C(name, ignore) FUNCTION_ADDR(Builtin_##name),
-  Address Builtins::c_functions_[cfunction_count] = {
-    BUILTIN_LIST_C(DEF_ENUM_C)
-  };
+Address const Builtins::c_functions_[cfunction_count] = {
+  BUILTIN_LIST_C(DEF_ENUM_C)
+};
 #undef DEF_ENUM_C
 
 #define DEF_JS_NAME(name, ignore) #name,
 #define DEF_JS_ARGC(ignore, argc) argc,
-const char* Builtins::javascript_names_[id_count] = {
+const char* const Builtins::javascript_names_[id_count] = {
   BUILTINS_LIST_JS(DEF_JS_NAME)
 };
 
-int Builtins::javascript_argc_[id_count] = {
+int const Builtins::javascript_argc_[id_count] = {
   BUILTINS_LIST_JS(DEF_JS_ARGC)
 };
 #undef DEF_JS_NAME
 #undef DEF_JS_ARGC
 
-static bool is_initialized = false;
+struct BuiltinDesc {
+  byte* generator;
+  byte* c_code;
+  const char* s_name;  // name is only used for generating log information.
+  int name;
+  Code::Flags flags;
+  BuiltinExtraArguments extra_args;
+};
+
+class BuiltinFunctionTable {
+ public:
+  BuiltinFunctionTable() {
+    Builtins::InitBuiltinFunctionTable();
+  }
+
+  static const BuiltinDesc* functions() { return functions_; }
+
+ private:
+  static BuiltinDesc functions_[Builtins::builtin_count + 1];
+
+  friend class Builtins;
+};
+
+BuiltinDesc BuiltinFunctionTable::functions_[Builtins::builtin_count + 1];
+
+static const BuiltinFunctionTable builtin_function_table_init;
+
+// Define array of pointers to generators and C builtin functions.
+// We do this in a sort of roundabout way so that we can do the initialization
+// within the lexical scope of Builtins:: and within a context where
+// Code::Flags names a non-abstract type.
+void Builtins::InitBuiltinFunctionTable() {
+  BuiltinDesc* functions = BuiltinFunctionTable::functions_;
+  functions[builtin_count].generator = NULL;
+  functions[builtin_count].c_code = NULL;
+  functions[builtin_count].s_name = NULL;
+  functions[builtin_count].name = builtin_count;
+  functions[builtin_count].flags = static_cast<Code::Flags>(0);
+  functions[builtin_count].extra_args = NO_EXTRA_ARGUMENTS;
+
+#define DEF_FUNCTION_PTR_C(aname, aextra_args)                         \
+    functions->generator = FUNCTION_ADDR(Generate_Adaptor);            \
+    functions->c_code = FUNCTION_ADDR(Builtin_##aname);                \
+    functions->s_name = #aname;                                        \
+    functions->name = c_##aname;                                       \
+    functions->flags = Code::ComputeFlags(Code::BUILTIN);              \
+    functions->extra_args = aextra_args;                               \
+    ++functions;
+
+#define DEF_FUNCTION_PTR_A(aname, kind, state, extra)                       \
+    functions->generator = FUNCTION_ADDR(Generate_##aname);                 \
+    functions->c_code = NULL;                                               \
+    functions->s_name = #aname;                                             \
+    functions->name = aname;                                                \
+    functions->flags = Code::ComputeFlags(Code::kind,                       \
+                                          NOT_IN_LOOP,                      \
+                                          state,                            \
+                                          extra);                           \
+    functions->extra_args = NO_EXTRA_ARGUMENTS;                             \
+    ++functions;
+
+  BUILTIN_LIST_C(DEF_FUNCTION_PTR_C)
+  BUILTIN_LIST_A(DEF_FUNCTION_PTR_A)
+  BUILTIN_LIST_DEBUG_A(DEF_FUNCTION_PTR_A)
+
+#undef DEF_FUNCTION_PTR_C
+#undef DEF_FUNCTION_PTR_A
+}
+
 void Builtins::Setup(bool create_heap_objects) {
-  ASSERT(!is_initialized);
+  ASSERT(!initialized_);
+  Heap* heap = Isolate::Current()->heap();
 
   // Create a scope for the handles in the builtins.
   HandleScope scope;
 
-  struct BuiltinDesc {
-    byte* generator;
-    byte* c_code;
-    const char* s_name;  // name is only used for generating log information.
-    int name;
-    Code::Flags flags;
-    BuiltinExtraArguments extra_args;
-  };
-
-#define DEF_FUNCTION_PTR_C(name, extra_args) \
-    { FUNCTION_ADDR(Generate_Adaptor),            \
-      FUNCTION_ADDR(Builtin_##name),              \
-      #name,                                      \
-      c_##name,                                   \
-      Code::ComputeFlags(Code::BUILTIN),          \
-      extra_args                                  \
-    },
-
-#define DEF_FUNCTION_PTR_A(name, kind, state, extra)              \
-    { FUNCTION_ADDR(Generate_##name),                             \
-      NULL,                                                       \
-      #name,                                                      \
-      name,                                                       \
-      Code::ComputeFlags(Code::kind, NOT_IN_LOOP, state, extra),  \
-      NO_EXTRA_ARGUMENTS                                          \
-    },
-
-  // Define array of pointers to generators and C builtin functions.
-  static BuiltinDesc functions[] = {
-      BUILTIN_LIST_C(DEF_FUNCTION_PTR_C)
-      BUILTIN_LIST_A(DEF_FUNCTION_PTR_A)
-      BUILTIN_LIST_DEBUG_A(DEF_FUNCTION_PTR_A)
-      // Terminator:
-      { NULL, NULL, NULL, builtin_count, static_cast<Code::Flags>(0),
-        NO_EXTRA_ARGUMENTS }
-  };
-
-#undef DEF_FUNCTION_PTR_C
-#undef DEF_FUNCTION_PTR_A
+  const BuiltinDesc* functions = BuiltinFunctionTable::functions();
 
   // For now we generate builtin adaptor code into a stack-allocated
   // buffer, before copying it into individual code objects.
   byte buffer[4*KB];
 
   // Traverse the list of builtins and generate an adaptor in a
   // separate code object for each one.
   for (int i = 0; i < builtin_count; i++) {
     if (create_heap_objects) {
       MacroAssembler masm(buffer, sizeof buffer);
       // Generate the code/adaptor.
       typedef void (*Generator)(MacroAssembler*, int, BuiltinExtraArguments);
       Generator g = FUNCTION_CAST<Generator>(functions[i].generator);
       // We pass all arguments to the generator, but it may not use all of
       // them.  This works because the first arguments are on top of the
       // stack.
       g(&masm, functions[i].name, functions[i].extra_args);
       // Move the code into the object heap.
       CodeDesc desc;
       masm.GetCode(&desc);
       Code::Flags flags =  functions[i].flags;
       Object* code = NULL;
       {
         // During startup it's OK to always allocate and defer GC to later.
         // This simplifies things because we don't need to retry.
         AlwaysAllocateScope __scope__;
         { MaybeObject* maybe_code =
-              Heap::CreateCode(desc, flags, masm.CodeObject());
+              heap->CreateCode(desc, flags, masm.CodeObject());
           if (!maybe_code->ToObject(&code)) {
             v8::internal::V8::FatalProcessOutOfMemory("CreateCode");
           }
         }
       }
       // Log the event and add the code to the builtins array.
-      PROFILE(CodeCreateEvent(Logger::BUILTIN_TAG,
+      PROFILE(ISOLATE,
+              CodeCreateEvent(Logger::BUILTIN_TAG,
                               Code::cast(code),
                               functions[i].s_name));
       GDBJIT(AddCode(GDBJITInterface::BUILTIN,
                      functions[i].s_name,
                      Code::cast(code)));
       builtins_[i] = code;
 #ifdef ENABLE_DISASSEMBLER
       if (FLAG_print_builtin_code) {
         PrintF("Builtin: %s\n", functions[i].s_name);
         Code::cast(code)->Disassemble(functions[i].s_name);
         PrintF("\n");
       }
 #endif
     } else {
       // Deserializing. The values will be filled in during IterateBuiltins.
       builtins_[i] = NULL;
     }
     names_[i] = functions[i].s_name;
   }
 
   // Mark as initialized.
-  is_initialized = true;
+  initialized_ = true;
 }
 
 
 void Builtins::TearDown() {
-  is_initialized = false;
+  initialized_ = false;
 }
 
 
 void Builtins::IterateBuiltins(ObjectVisitor* v) {
   v->VisitPointers(&builtins_[0], &builtins_[0] + builtin_count);
 }
 
 
 const char* Builtins::Lookup(byte* pc) {
-  if (is_initialized) {  // may be called during initialization (disassembler!)
+  // may be called during initialization (disassembler!)
+  if (initialized_) {
     for (int i = 0; i < builtin_count; i++) {
       Code* entry = Code::cast(builtins_[i]);
       if (entry->contains(pc)) {
         return names_[i];
       }
     }
   }
   return NULL;
 }
 
 
 } }  // namespace v8::internal