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/*
* Copyright (C) 2013-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "JSArrayBufferView.h"
#include "GenericTypedArrayViewInlines.h"
#include "JSArrayBuffer.h"
#include "JSCInlines.h"
#include "JSGenericTypedArrayViewInlines.h"
#include "JSTypedArrays.h"
#include "TypeError.h"
#include "TypedArrayController.h"
#include "TypedArrays.h"
#include <wtf/Gigacage.h>
namespace JSC {
const ClassInfo JSArrayBufferView::s_info = {
"ArrayBufferView", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSArrayBufferView)
};
String JSArrayBufferView::toStringName(const JSObject*, ExecState*)
{
return "Object"_s;
}
JSArrayBufferView::ConstructionContext::ConstructionContext(
Structure* structure, uint32_t length, void* vector)
: m_structure(structure)
, m_vector(vector, length)
, m_length(length)
, m_mode(FastTypedArray)
, m_butterfly(nullptr)
{
ASSERT(vector == removeArrayPtrTag(vector));
RELEASE_ASSERT(length <= fastSizeLimit);
}
JSArrayBufferView::ConstructionContext::ConstructionContext(
VM& vm, Structure* structure, uint32_t length, uint32_t elementSize,
InitializationMode mode)
: m_structure(0)
, m_length(length)
, m_butterfly(0)
{
if (length <= fastSizeLimit) {
// Attempt GC allocation.
void* temp;
size_t size = sizeOf(length, elementSize);
temp = vm.primitiveGigacageAuxiliarySpace.allocateNonVirtual(vm, size, nullptr, AllocationFailureMode::ReturnNull);
if (!temp)
return;
m_structure = structure;
m_vector = VectorType(temp, length);
m_mode = FastTypedArray;
if (mode == ZeroFill) {
uint64_t* asWords = static_cast<uint64_t*>(vector());
for (unsigned i = size / sizeof(uint64_t); i--;)
asWords[i] = 0;
}
return;
}
// Don't allow a typed array to use more than 2GB.
if (length > static_cast<unsigned>(INT_MAX) / elementSize)
return;
size_t size = static_cast<size_t>(length) * static_cast<size_t>(elementSize);
m_vector = VectorType(Gigacage::tryMalloc(Gigacage::Primitive, size), length);
if (!m_vector)
return;
if (mode == ZeroFill)
memset(vector(), 0, size);
vm.heap.reportExtraMemoryAllocated(static_cast<size_t>(length) * elementSize);
m_structure = structure;
m_mode = OversizeTypedArray;
}
JSArrayBufferView::ConstructionContext::ConstructionContext(
VM& vm, Structure* structure, RefPtr<ArrayBuffer>&& arrayBuffer,
unsigned byteOffset, unsigned length)
: m_structure(structure)
, m_length(length)
, m_mode(WastefulTypedArray)
{
ASSERT(arrayBuffer->data() == removeArrayPtrTag(arrayBuffer->data()));
m_vector = VectorType(static_cast<uint8_t*>(arrayBuffer->data()) + byteOffset, length);
IndexingHeader indexingHeader;
indexingHeader.setArrayBuffer(arrayBuffer.get());
m_butterfly = Butterfly::create(vm, 0, 0, 0, true, indexingHeader, 0);
}
JSArrayBufferView::ConstructionContext::ConstructionContext(
Structure* structure, RefPtr<ArrayBuffer>&& arrayBuffer,
unsigned byteOffset, unsigned length, DataViewTag)
: m_structure(structure)
, m_length(length)
, m_mode(DataViewMode)
, m_butterfly(0)
{
ASSERT(arrayBuffer->data() == removeArrayPtrTag(arrayBuffer->data()));
m_vector = VectorType(static_cast<uint8_t*>(arrayBuffer->data()) + byteOffset, length);
}
JSArrayBufferView::JSArrayBufferView(VM& vm, ConstructionContext& context)
: Base(vm, context.structure(), nullptr)
, m_length(context.length())
, m_mode(context.mode())
{
setButterfly(vm, context.butterfly());
ASSERT(context.vector() == removeArrayPtrTag(context.vector()));
m_vector.setWithoutBarrier(context.vector(), m_length);
}
void JSArrayBufferView::finishCreation(VM& vm)
{
Base::finishCreation(vm);
ASSERT(jsDynamicCast<JSArrayBufferView*>(vm, this));
switch (m_mode) {
case FastTypedArray:
return;
case OversizeTypedArray:
vm.heap.addFinalizer(this, finalize);
return;
case WastefulTypedArray:
vm.heap.addReference(this, butterfly()->indexingHeader()->arrayBuffer());
return;
case DataViewMode:
ASSERT(!butterfly());
vm.heap.addReference(this, jsCast<JSDataView*>(this)->possiblySharedBuffer());
return;
}
RELEASE_ASSERT_NOT_REACHED();
}
void JSArrayBufferView::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
JSArrayBufferView* thisObject = jsCast<JSArrayBufferView*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(cell, visitor);
if (thisObject->hasArrayBuffer()) {
WTF::loadLoadFence();
ArrayBuffer* buffer = thisObject->possiblySharedBuffer();
RELEASE_ASSERT(buffer);
visitor.addOpaqueRoot(buffer);
}
}
bool JSArrayBufferView::put(
JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value,
PutPropertySlot& slot)
{
JSArrayBufferView* thisObject = jsCast<JSArrayBufferView*>(cell);
if (UNLIKELY(isThisValueAltered(slot, thisObject)))
return ordinarySetSlow(exec, thisObject, propertyName, value, slot.thisValue(), slot.isStrictMode());
return Base::put(thisObject, exec, propertyName, value, slot);
}
ArrayBuffer* JSArrayBufferView::unsharedBuffer()
{
ArrayBuffer* result = possiblySharedBuffer();
RELEASE_ASSERT(!result->isShared());
return result;
}
void JSArrayBufferView::finalize(JSCell* cell)
{
JSArrayBufferView* thisObject = static_cast<JSArrayBufferView*>(cell);
ASSERT(thisObject->m_mode == OversizeTypedArray || thisObject->m_mode == WastefulTypedArray);
if (thisObject->m_mode == OversizeTypedArray)
Gigacage::free(Gigacage::Primitive, thisObject->vector());
}
JSArrayBuffer* JSArrayBufferView::unsharedJSBuffer(ExecState* exec)
{
VM& vm = exec->vm();
return vm.m_typedArrayController->toJS(exec, globalObject(vm), unsharedBuffer());
}
JSArrayBuffer* JSArrayBufferView::possiblySharedJSBuffer(ExecState* exec)
{
VM& vm = exec->vm();
return vm.m_typedArrayController->toJS(exec, globalObject(vm), possiblySharedBuffer());
}
void JSArrayBufferView::neuter()
{
auto locker = holdLock(cellLock());
RELEASE_ASSERT(hasArrayBuffer());
RELEASE_ASSERT(!isShared());
m_length = 0;
m_vector.clear();
}
static const constexpr size_t ElementSizeData[] = {
#define FACTORY(type) sizeof(typename type ## Adaptor::Type),
FOR_EACH_TYPED_ARRAY_TYPE_EXCLUDING_DATA_VIEW(FACTORY)
#undef FACTORY
};
#define FACTORY(type) static_assert(std::is_final<JS ## type ## Array>::value, "");
FOR_EACH_TYPED_ARRAY_TYPE_EXCLUDING_DATA_VIEW(FACTORY)
#undef FACTORY
static inline size_t elementSize(JSType type)
{
ASSERT(type >= Int8ArrayType && type <= Float64ArrayType);
return ElementSizeData[type - Int8ArrayType];
}
ArrayBuffer* JSArrayBufferView::slowDownAndWasteMemory()
{
ASSERT(m_mode == FastTypedArray || m_mode == OversizeTypedArray);
// We play this game because we want this to be callable even from places that
// don't have access to ExecState* or the VM, and we only allocate so little
// memory here that it's not necessary to trigger a GC - just accounting what
// we have done is good enough. The sort of bizarre exception to the "allocating
// little memory" is when we transfer a backing buffer into the C heap; this
// will temporarily get counted towards heap footprint (incorrectly, in the case
// of adopting an oversize typed array) but we don't GC here anyway. That's
// almost certainly fine. The worst case is if you created a ton of fast typed
// arrays, and did nothing but caused all of them to slow down and waste memory.
// In that case, your memory footprint will double before the GC realizes what's
// up. But if you do *anything* to trigger a GC watermark check, it will know
// that you *had* done those allocations and it will GC appropriately.
Heap* heap = Heap::heap(this);
VM& vm = heap->vm();
DeferGCForAWhile deferGC(*heap);
RELEASE_ASSERT(!hasIndexingHeader(vm));
Structure* structure = this->structure(vm);
setButterfly(vm, Butterfly::createOrGrowArrayRight(
butterfly(), vm, this, structure,
structure->outOfLineCapacity(), false, 0, 0));
RefPtr<ArrayBuffer> buffer;
unsigned byteLength = m_length * elementSize(type());
switch (m_mode) {
case FastTypedArray:
buffer = ArrayBuffer::create(vector(), byteLength);
break;
case OversizeTypedArray:
// FIXME: consider doing something like "subtracting" from extra memory
// cost, since right now this case will cause the GC to think that we reallocated
// the whole buffer.
buffer = ArrayBuffer::createAdopted(vector(), byteLength);
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
{
auto locker = holdLock(cellLock());
butterfly()->indexingHeader()->setArrayBuffer(buffer.get());
m_vector.setWithoutBarrier(buffer->data(), m_length);
WTF::storeStoreFence();
m_mode = WastefulTypedArray;
}
heap->addReference(this, buffer.get());
return buffer.get();
}
// Allocates the full-on native buffer and moves data into the C heap if
// necessary. Note that this never allocates in the GC heap.
RefPtr<ArrayBufferView> JSArrayBufferView::possiblySharedImpl()
{
ArrayBuffer* buffer = possiblySharedBuffer();
unsigned byteOffset = this->byteOffset();
unsigned length = this->length();
switch (type()) {
#define FACTORY(type) \
case type ## ArrayType: \
return type ## Array::tryCreate(buffer, byteOffset, length);
FOR_EACH_TYPED_ARRAY_TYPE_EXCLUDING_DATA_VIEW(FACTORY)
#undef FACTORY
case DataViewType:
return DataView::create(buffer, byteOffset, length);
default:
RELEASE_ASSERT_NOT_REACHED();
return nullptr;
}
}
} // namespace JSC
namespace WTF {
using namespace JSC;
void printInternal(PrintStream& out, TypedArrayMode mode)
{
switch (mode) {
case FastTypedArray:
out.print("FastTypedArray");
return;
case OversizeTypedArray:
out.print("OversizeTypedArray");
return;
case WastefulTypedArray:
out.print("WastefulTypedArray");
return;
case DataViewMode:
out.print("DataViewMode");
return;
}
RELEASE_ASSERT_NOT_REACHED();
}
} // namespace WTF