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// Copyright 2018 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.
#ifndef V8_OBJECTS_JS_ARRAY_BUFFER_INL_H_
#define V8_OBJECTS_JS_ARRAY_BUFFER_INL_H_
#include "src/objects/js-array-buffer.h"
#include "src/heap/heap-write-barrier-inl.h"
#include "src/objects/js-objects-inl.h"
#include "src/objects/objects-inl.h"
#include "src/wasm/wasm-engine.h"
// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"
namespace v8 {
namespace internal {
OBJECT_CONSTRUCTORS_IMPL(JSArrayBuffer, JSObject)
OBJECT_CONSTRUCTORS_IMPL(JSArrayBufferView, JSObject)
OBJECT_CONSTRUCTORS_IMPL(JSTypedArray, JSArrayBufferView)
OBJECT_CONSTRUCTORS_IMPL(JSDataView, JSArrayBufferView)
CAST_ACCESSOR(JSArrayBuffer)
CAST_ACCESSOR(JSArrayBufferView)
CAST_ACCESSOR(JSTypedArray)
CAST_ACCESSOR(JSDataView)
size_t JSArrayBuffer::byte_length() const {
return ReadField<size_t>(kByteLengthOffset);
}
void JSArrayBuffer::set_byte_length(size_t value) {
WriteField<size_t>(kByteLengthOffset, value);
}
void* JSArrayBuffer::backing_store() const {
return reinterpret_cast<void*>(ReadField<Address>(kBackingStoreOffset));
}
void JSArrayBuffer::set_backing_store(void* value, WriteBarrierMode mode) {
WriteField<Address>(kBackingStoreOffset, reinterpret_cast<Address>(value));
}
size_t JSArrayBuffer::allocation_length() const {
if (backing_store() == nullptr) {
return 0;
}
// If this buffer is managed by the WasmMemoryTracker
if (is_wasm_memory()) {
const auto* data =
GetIsolate()->wasm_engine()->memory_tracker()->FindAllocationData(
backing_store());
DCHECK_NOT_NULL(data);
return data->allocation_length;
}
return byte_length();
}
void* JSArrayBuffer::allocation_base() const {
if (backing_store() == nullptr) {
return nullptr;
}
// If this buffer is managed by the WasmMemoryTracker
if (is_wasm_memory()) {
const auto* data =
GetIsolate()->wasm_engine()->memory_tracker()->FindAllocationData(
backing_store());
DCHECK_NOT_NULL(data);
return data->allocation_base;
}
return backing_store();
}
bool JSArrayBuffer::is_wasm_memory() const {
return IsWasmMemoryBit::decode(bit_field());
}
void JSArrayBuffer::set_is_wasm_memory(bool is_wasm_memory) {
set_bit_field(IsWasmMemoryBit::update(bit_field(), is_wasm_memory));
}
void JSArrayBuffer::clear_padding() {
if (FIELD_SIZE(kOptionalPaddingOffset) != 0) {
DCHECK_EQ(4, FIELD_SIZE(kOptionalPaddingOffset));
memset(reinterpret_cast<void*>(address() + kOptionalPaddingOffset), 0,
FIELD_SIZE(kOptionalPaddingOffset));
}
}
void JSArrayBuffer::set_bit_field(uint32_t bits) {
WriteField<uint32_t>(kBitFieldOffset, bits);
}
uint32_t JSArrayBuffer::bit_field() const {
return ReadField<uint32_t>(kBitFieldOffset);
}
// |bit_field| fields.
BIT_FIELD_ACCESSORS(JSArrayBuffer, bit_field, is_external,
JSArrayBuffer::IsExternalBit)
BIT_FIELD_ACCESSORS(JSArrayBuffer, bit_field, is_detachable,
JSArrayBuffer::IsDetachableBit)
BIT_FIELD_ACCESSORS(JSArrayBuffer, bit_field, was_detached,
JSArrayBuffer::WasDetachedBit)
BIT_FIELD_ACCESSORS(JSArrayBuffer, bit_field, is_shared,
JSArrayBuffer::IsSharedBit)
size_t JSArrayBufferView::byte_offset() const {
return ReadField<size_t>(kByteOffsetOffset);
}
void JSArrayBufferView::set_byte_offset(size_t value) {
WriteField<size_t>(kByteOffsetOffset, value);
}
size_t JSArrayBufferView::byte_length() const {
return ReadField<size_t>(kByteLengthOffset);
}
void JSArrayBufferView::set_byte_length(size_t value) {
WriteField<size_t>(kByteLengthOffset, value);
}
ACCESSORS(JSArrayBufferView, buffer, Object, kBufferOffset)
bool JSArrayBufferView::WasDetached() const {
return JSArrayBuffer::cast(buffer()).was_detached();
}
size_t JSTypedArray::length() const { return ReadField<size_t>(kLengthOffset); }
void JSTypedArray::set_length(size_t value) {
WriteField<size_t>(kLengthOffset, value);
}
void* JSTypedArray::external_pointer() const {
return reinterpret_cast<void*>(ReadField<Address>(kExternalPointerOffset));
}
void JSTypedArray::set_external_pointer(void* value) {
WriteField<Address>(kExternalPointerOffset, reinterpret_cast<Address>(value));
}
ACCESSORS(JSTypedArray, base_pointer, Object, kBasePointerOffset)
void* JSTypedArray::DataPtr() {
return reinterpret_cast<void*>(
base_pointer().ptr() + reinterpret_cast<intptr_t>(external_pointer()));
}
bool JSTypedArray::is_on_heap() const {
DisallowHeapAllocation no_gc;
// Checking that buffer()->backing_store() is not nullptr is not sufficient;
// it will be nullptr when byte_length is 0 as well.
return base_pointer().ptr() == elements().ptr();
}
// static
void* JSTypedArray::ExternalPointerForOnHeapArray() {
return reinterpret_cast<void*>(ByteArray::kHeaderSize - kHeapObjectTag);
}
// static
MaybeHandle<JSTypedArray> JSTypedArray::Validate(Isolate* isolate,
Handle<Object> receiver,
const char* method_name) {
if (V8_UNLIKELY(!receiver->IsJSTypedArray())) {
const MessageTemplate message = MessageTemplate::kNotTypedArray;
THROW_NEW_ERROR(isolate, NewTypeError(message), JSTypedArray);
}
Handle<JSTypedArray> array = Handle<JSTypedArray>::cast(receiver);
if (V8_UNLIKELY(array->WasDetached())) {
const MessageTemplate message = MessageTemplate::kDetachedOperation;
Handle<String> operation =
isolate->factory()->NewStringFromAsciiChecked(method_name);
THROW_NEW_ERROR(isolate, NewTypeError(message, operation), JSTypedArray);
}
// spec describes to return `buffer`, but it may disrupt current
// implementations, and it's much useful to return array for now.
return array;
}
void* JSDataView::data_pointer() const {
return reinterpret_cast<void*>(ReadField<Address>(kDataPointerOffset));
}
void JSDataView::set_data_pointer(void* value) {
WriteField<Address>(kDataPointerOffset, reinterpret_cast<Address>(value));
}
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_JS_ARRAY_BUFFER_INL_H_
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