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// Copyright 2016 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.
#include "src/builtins/builtins.h"
#include "src/builtins/builtins-utils.h"
namespace v8 {
namespace internal {
// -----------------------------------------------------------------------------
// ES6 section 22.2 TypedArray Objects
// ES6 section 22.2.3.1 get %TypedArray%.prototype.buffer
BUILTIN(TypedArrayPrototypeBuffer) {
HandleScope scope(isolate);
CHECK_RECEIVER(JSTypedArray, typed_array, "get TypedArray.prototype.buffer");
return *typed_array->GetBuffer();
}
namespace {
void Generate_TypedArrayProtoypeGetter(CodeStubAssembler* assembler,
const char* method_name,
int object_offset) {
typedef CodeStubAssembler::Label Label;
typedef compiler::Node Node;
Node* receiver = assembler->Parameter(0);
Node* context = assembler->Parameter(3);
// Check if the {receiver} is actually a JSTypedArray.
Label if_receiverisincompatible(assembler, Label::kDeferred);
assembler->GotoIf(assembler->WordIsSmi(receiver), &if_receiverisincompatible);
Node* receiver_instance_type = assembler->LoadInstanceType(receiver);
assembler->GotoUnless(
assembler->Word32Equal(receiver_instance_type,
assembler->Int32Constant(JS_TYPED_ARRAY_TYPE)),
&if_receiverisincompatible);
// Check if the {receiver}'s JSArrayBuffer was neutered.
Node* receiver_buffer =
assembler->LoadObjectField(receiver, JSTypedArray::kBufferOffset);
Node* receiver_buffer_bit_field = assembler->LoadObjectField(
receiver_buffer, JSArrayBuffer::kBitFieldOffset, MachineType::Uint32());
Label if_receiverisneutered(assembler, Label::kDeferred);
assembler->GotoUnless(
assembler->Word32Equal(
assembler->Word32And(
receiver_buffer_bit_field,
assembler->Int32Constant(JSArrayBuffer::WasNeutered::kMask)),
assembler->Int32Constant(0)),
&if_receiverisneutered);
assembler->Return(assembler->LoadObjectField(receiver, object_offset));
assembler->Bind(&if_receiverisneutered);
{
// The {receiver}s buffer was neutered, default to zero.
assembler->Return(assembler->SmiConstant(0));
}
assembler->Bind(&if_receiverisincompatible);
{
// The {receiver} is not a valid JSGeneratorObject.
Node* result = assembler->CallRuntime(
Runtime::kThrowIncompatibleMethodReceiver, context,
assembler->HeapConstant(assembler->factory()->NewStringFromAsciiChecked(
method_name, TENURED)),
receiver);
assembler->Return(result); // Never reached.
}
}
} // namespace
// ES6 section 22.2.3.2 get %TypedArray%.prototype.byteLength
void Builtins::Generate_TypedArrayPrototypeByteLength(
CodeStubAssembler* assembler) {
Generate_TypedArrayProtoypeGetter(assembler,
"get TypedArray.prototype.byteLength",
JSTypedArray::kByteLengthOffset);
}
// ES6 section 22.2.3.3 get %TypedArray%.prototype.byteOffset
void Builtins::Generate_TypedArrayPrototypeByteOffset(
CodeStubAssembler* assembler) {
Generate_TypedArrayProtoypeGetter(assembler,
"get TypedArray.prototype.byteOffset",
JSTypedArray::kByteOffsetOffset);
}
// ES6 section 22.2.3.18 get %TypedArray%.prototype.length
void Builtins::Generate_TypedArrayPrototypeLength(
CodeStubAssembler* assembler) {
Generate_TypedArrayProtoypeGetter(assembler,
"get TypedArray.prototype.length",
JSTypedArray::kLengthOffset);
}
} // namespace internal
} // namespace v8
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