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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;
}
return byte_length();
}
void* JSArrayBuffer::allocation_base() const {
if (backing_store() == nullptr) {
return nullptr;
}
return backing_store();
}
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) {
RELAXED_WRITE_UINT32_FIELD(*this, kBitFieldOffset, bits);
}
uint32_t JSArrayBuffer::bit_field() const {
return RELAXED_READ_UINT32_FIELD(*this, 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_asmjs_memory,
JSArrayBuffer::IsAsmJsMemoryBit)
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);
}
Address JSTypedArray::external_pointer() const {
return ReadField<Address>(kExternalPointerOffset);
}
void JSTypedArray::set_external_pointer(Address value) {
WriteField<Address>(kExternalPointerOffset, value);
}
Address JSTypedArray::ExternalPointerCompensationForOnHeapArray(
Isolate* isolate) {
#ifdef V8_COMPRESS_POINTERS
return GetIsolateRoot(isolate);
#else
return 0;
#endif
}
void JSTypedArray::RemoveExternalPointerCompensationForSerialization() {
DCHECK(is_on_heap());
Isolate* isolate = GetIsolateForPtrCompr(*this);
set_external_pointer(external_pointer() -
ExternalPointerCompensationForOnHeapArray(isolate));
}
ACCESSORS(JSTypedArray, base_pointer, Object, kBasePointerOffset)
void* JSTypedArray::DataPtr() {
// Zero-extend Tagged_t to Address according to current compression scheme
// so that the addition with |external_pointer| (which already contains
// compensated offset value) will decompress the tagged value.
// See JSTypedArray::ExternalPointerCompensationForOnHeapArray() for details.
return reinterpret_cast<void*>(external_pointer() +
static_cast<Tagged_t>(base_pointer().ptr()));
}
void JSTypedArray::SetOffHeapDataPtr(void* base, Address offset) {
set_base_pointer(Smi::kZero, SKIP_WRITE_BARRIER);
Address address = reinterpret_cast<Address>(base) + offset;
set_external_pointer(address);
DCHECK_EQ(address, reinterpret_cast<Address>(DataPtr()));
}
void JSTypedArray::SetOnHeapDataPtr(HeapObject base, Address offset) {
set_base_pointer(base);
Isolate* isolate = GetIsolateForPtrCompr(*this);
set_external_pointer(offset +
ExternalPointerCompensationForOnHeapArray(isolate));
DCHECK_EQ(base.ptr() + offset, reinterpret_cast<Address>(DataPtr()));
}
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() == elements();
}
// 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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