Reland "Remove the weak list of views from array buffers"

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 4359 matching lines @@
 template <class Traits>
 Handle<Object> FixedTypedArray<Traits>::get(
     Handle<FixedTypedArray<Traits> > array,
     int index) {
   return Traits::ToHandle(array->GetIsolate(), array->get_scalar(index));
 }
 
 
 template <class Traits>
 Handle<Object> FixedTypedArray<Traits>::SetValue(
-    Handle<FixedTypedArray<Traits> > array,
-    uint32_t index,
-    Handle<Object> value) {
+    Handle<JSObject> holder, Handle<FixedTypedArray<Traits> > array,
+    uint32_t index, Handle<Object> value) {
   ElementType cast_value = Traits::defaultValue();
-  if (index < static_cast<uint32_t>(array->length())) {
-    if (value->IsSmi()) {
-      int int_value = Handle<Smi>::cast(value)->value();
-      cast_value = from_int(int_value);
-    } else if (value->IsHeapNumber()) {
-      double double_value = Handle<HeapNumber>::cast(value)->value();
-      cast_value = from_double(double_value);
-    } else {
-      // Clamp undefined to the default value. All other types have been
-      // converted to a number type further up in the call chain.
-      DCHECK(value->IsUndefined());
+  Handle<JSArrayBufferView> view = Handle<JSArrayBufferView>::cast(holder);
+  if (!view->WasNeutered()) {
+    if (index < static_cast<uint32_t>(array->length())) {
+      if (value->IsSmi()) {
+        int int_value = Handle<Smi>::cast(value)->value();
+        cast_value = from_int(int_value);
+      } else if (value->IsHeapNumber()) {
+        double double_value = Handle<HeapNumber>::cast(value)->value();
+        cast_value = from_double(double_value);
+      } else {
+        // Clamp undefined to the default value. All other types have been
+        // converted to a number type further up in the call chain.
+        DCHECK(value->IsUndefined());
+      }
+      array->set(index, cast_value);
     }
-    array->set(index, cast_value);
   }
   return Traits::ToHandle(array->GetIsolate(), cast_value);
 }
 
 
 Handle<Object> Uint8ArrayTraits::ToHandle(Isolate* isolate, uint8_t scalar) {
   return handle(Smi::FromInt(scalar), isolate);
 }
 
 
@@ skipping 2041 matching lines @@
 bool JSArrayBuffer::is_neuterable() {
   return BooleanBit::get(flag(), kIsNeuterableBit);
 }
 
 
 void JSArrayBuffer::set_is_neuterable(bool value) {
   set_flag(BooleanBit::set(flag(), kIsNeuterableBit, value));
 }
 
 
+bool JSArrayBuffer::was_neutered() {
+  return BooleanBit::get(flag(), kWasNeuteredBit);
+}
+
+
+void JSArrayBuffer::set_was_neutered(bool value) {
+  set_flag(BooleanBit::set(flag(), kWasNeuteredBit, value));
+}
+
+
 ACCESSORS(JSArrayBuffer, weak_next, Object, kWeakNextOffset)
-ACCESSORS(JSArrayBuffer, weak_first_view, Object, kWeakFirstViewOffset)
+
+
+Object* JSArrayBufferView::byte_offset() const {
+  if (WasNeutered()) return Smi::FromInt(0);
+  return Object::cast(READ_FIELD(this, kByteOffsetOffset));
+}
+
+
+void JSArrayBufferView::set_byte_offset(Object* value, WriteBarrierMode mode) {
+  WRITE_FIELD(this, kByteOffsetOffset, value);
+  CONDITIONAL_WRITE_BARRIER(GetHeap(), this, kByteOffsetOffset, value, mode);
+}
+
+
+Object* JSArrayBufferView::byte_length() const {
+  if (WasNeutered()) return Smi::FromInt(0);
+  return Object::cast(READ_FIELD(this, kByteLengthOffset));
+}
+
+
+void JSArrayBufferView::set_byte_length(Object* value, WriteBarrierMode mode) {
+  WRITE_FIELD(this, kByteLengthOffset, value);
+  CONDITIONAL_WRITE_BARRIER(GetHeap(), this, kByteLengthOffset, value, mode);
+}
 
 
 ACCESSORS(JSArrayBufferView, buffer, Object, kBufferOffset)
-ACCESSORS(JSArrayBufferView, byte_offset, Object, kByteOffsetOffset)
-ACCESSORS(JSArrayBufferView, byte_length, Object, kByteLengthOffset)
-ACCESSORS(JSArrayBufferView, weak_next, Object, kWeakNextOffset)
-ACCESSORS(JSTypedArray, length, Object, kLengthOffset)
+#ifdef VERIFY_HEAP
+ACCESSORS(JSArrayBufferView, raw_byte_offset, Object, kByteOffsetOffset)
+ACCESSORS(JSArrayBufferView, raw_byte_length, Object, kByteLengthOffset)
+#endif
+
+
+bool JSArrayBufferView::WasNeutered() const {
+  return !buffer()->IsSmi() && JSArrayBuffer::cast(buffer())->was_neutered();
+}
+
+
+Object* JSTypedArray::length() const {
+  if (WasNeutered()) return Smi::FromInt(0);
+  return Object::cast(READ_FIELD(this, kLengthOffset));
+}
+
+
+void JSTypedArray::set_length(Object* value, WriteBarrierMode mode) {
+  WRITE_FIELD(this, kLengthOffset, value);
+  CONDITIONAL_WRITE_BARRIER(GetHeap(), this, kLengthOffset, value, mode);
+}
+
+
+#ifdef VERIFY_HEAP
+ACCESSORS(JSTypedArray, raw_length, Object, kLengthOffset)
+#endif
+
 
 ACCESSORS(JSRegExp, data, Object, kDataOffset)
 
 
 JSRegExp::Type JSRegExp::TypeTag() {
   Object* data = this->data();
   if (data->IsUndefined()) return JSRegExp::NOT_COMPILED;
   Smi* smi = Smi::cast(FixedArray::cast(data)->get(kTagIndex));
   return static_cast<JSRegExp::Type>(smi->value());
 }
@@ skipping 1067 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_