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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-inl.h"
#include "src/objects/js-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 READ_UINTPTR_FIELD(*this, kByteLengthOffset);
}
void JSArrayBuffer::set_byte_length(size_t value) {
WRITE_UINTPTR_FIELD(*this, kByteLengthOffset, value);
}
void* JSArrayBuffer::backing_store() const {
intptr_t ptr = READ_INTPTR_FIELD(*this, kBackingStoreOffset);
return reinterpret_cast<void*>(ptr);
}
void JSArrayBuffer::set_backing_store(void* value, WriteBarrierMode mode) {
intptr_t ptr = reinterpret_cast<intptr_t>(value);
WRITE_INTPTR_FIELD(*this, kBackingStoreOffset, ptr);
}
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 {
bool const is_wasm_memory = IsWasmMemoryBit::decode(bit_field());
DCHECK_EQ(is_wasm_memory,
GetIsolate()->wasm_engine()->memory_tracker()->IsWasmMemory(
backing_store()));
return is_wasm_memory;
}
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) {
WRITE_UINT32_FIELD(*this, kBitFieldOffset, bits);
}
uint32_t JSArrayBuffer::bit_field() const {
return 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_shared,
JSArrayBuffer::IsSharedBit)
BIT_FIELD_ACCESSORS(JSArrayBuffer, bit_field, is_growable,
JSArrayBuffer::IsGrowableBit)
size_t JSArrayBufferView::byte_offset() const {
return READ_UINTPTR_FIELD(*this, kByteOffsetOffset);
}
void JSArrayBufferView::set_byte_offset(size_t value) {
WRITE_UINTPTR_FIELD(*this, kByteOffsetOffset, value);
}
size_t JSArrayBufferView::byte_length() const {
return READ_UINTPTR_FIELD(*this, kByteLengthOffset);
}
void JSArrayBufferView::set_byte_length(size_t value) {
WRITE_UINTPTR_FIELD(*this, kByteLengthOffset, value);
}
ACCESSORS(JSArrayBufferView, buffer, Object, kBufferOffset)
bool JSArrayBufferView::WasDetached() const {
return JSArrayBuffer::cast(buffer())->was_detached();
}
Object JSTypedArray::length() const { return READ_FIELD(*this, kLengthOffset); }
size_t JSTypedArray::length_value() const {
double val = length()->Number();
DCHECK_LE(val, kMaxSafeInteger); // 2^53-1
DCHECK_GE(val, -kMaxSafeInteger); // -2^53+1
DCHECK_LE(val, std::numeric_limits<size_t>::max());
DCHECK_GE(val, std::numeric_limits<size_t>::min());
return static_cast<size_t>(val);
}
void JSTypedArray::set_length(Object value, WriteBarrierMode mode) {
WRITE_FIELD(*this, kLengthOffset, value);
CONDITIONAL_WRITE_BARRIER(*this, kLengthOffset, value, mode);
}
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.
FixedTypedArrayBase fta = FixedTypedArrayBase::cast(elements());
return fta->base_pointer()->ptr() == fta.ptr();
}
// 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;
}
#ifdef VERIFY_HEAP
ACCESSORS(JSTypedArray, raw_length, Object, kLengthOffset)
#endif
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_JS_ARRAY_BUFFER_INL_H_
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