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/*
* Copyright (C) 2016-2021 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 "JSWebAssemblyMemory.h"
#if ENABLE(WEBASSEMBLY)
#include "JSCInlines.h"
#include "ArrayBuffer.h"
#include "JSArrayBuffer.h"
#include "ObjectConstructor.h"
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
const ClassInfo JSWebAssemblyMemory::s_info = { "WebAssembly.Memory"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSWebAssemblyMemory) };
JSWebAssemblyMemory* JSWebAssemblyMemory::create(VM& vm, Structure* structure)
{
auto* memory = new (NotNull, allocateCell<JSWebAssemblyMemory>(vm)) JSWebAssemblyMemory(vm, structure);
memory->finishCreation(vm);
return memory;
}
void JSWebAssemblyMemory::adopt(Ref<Wasm::Memory>&& memory)
{
m_memory.swap(memory);
ASSERT(m_memory->refCount() == 1);
m_memory->checkLifetime();
}
Structure* JSWebAssemblyMemory::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
}
JSWebAssemblyMemory::JSWebAssemblyMemory(VM& vm, Structure* structure)
: Base(vm, structure)
, m_memory(Wasm::Memory::create(vm))
{
}
JSArrayBuffer* JSWebAssemblyMemory::buffer(JSGlobalObject* globalObject)
{
VM& vm = globalObject->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
auto* wrapper = m_bufferWrapper.get();
if (wrapper) {
// If SharedArrayBuffer's underlying memory is not grown, we continue using cached wrapper.
if (wrapper->impl()->byteLength() == memory().size())
return wrapper;
}
if (m_memory->sharingMode() == MemorySharingMode::Shared && m_memory->shared()) {
m_buffer = ArrayBuffer::createShared(*m_memory->shared());
m_buffer->makeWasmMemory();
} else {
Ref<BufferMemoryHandle> protectedHandle = m_memory->handle();
void* memory = m_memory->basePointer();
size_t size = m_memory->size();
ASSERT(memory);
auto destructor = createSharedTask<void(void*)>([protectedHandle = WTFMove(protectedHandle)] (void*) { });
m_buffer = ArrayBuffer::createFromBytes({ static_cast<const uint8_t*>(memory), size }, WTFMove(destructor));
m_buffer->makeWasmMemory();
if (m_memory->sharingMode() == MemorySharingMode::Shared)
m_buffer->makeShared();
}
auto* arrayBuffer = JSArrayBuffer::create(vm, globalObject->arrayBufferStructure(m_buffer->sharingMode()), m_buffer.get());
if (m_memory->sharingMode() == MemorySharingMode::Shared) {
objectConstructorFreeze(globalObject, arrayBuffer);
RETURN_IF_EXCEPTION(throwScope, { });
}
m_bufferWrapper.set(vm, this, arrayBuffer);
RELEASE_ASSERT(m_bufferWrapper);
return m_bufferWrapper.get();
}
PageCount JSWebAssemblyMemory::grow(VM& vm, JSGlobalObject* globalObject, uint32_t delta)
{
auto throwScope = DECLARE_THROW_SCOPE(vm);
auto grown = memory().grow(vm, PageCount(delta));
if (!grown) {
switch (grown.error()) {
case GrowFailReason::InvalidDelta:
throwException(globalObject, throwScope, createRangeError(globalObject, "WebAssembly.Memory.grow expects the delta to be a valid page count"_s));
break;
case GrowFailReason::InvalidGrowSize:
throwException(globalObject, throwScope, createRangeError(globalObject, "WebAssembly.Memory.grow expects the grown size to be a valid page count"_s));
break;
case GrowFailReason::WouldExceedMaximum:
throwException(globalObject, throwScope, createRangeError(globalObject, "WebAssembly.Memory.grow would exceed the memory's declared maximum size"_s));
break;
case GrowFailReason::OutOfMemory:
throwException(globalObject, throwScope, createOutOfMemoryError(globalObject));
break;
case GrowFailReason::GrowSharedUnavailable:
throwException(globalObject, throwScope, createRangeError(globalObject, "WebAssembly.Memory.grow for shared memory is unavailable"_s));
break;
}
return PageCount();
}
return grown.value();
}
JSObject* JSWebAssemblyMemory::type(JSGlobalObject* globalObject)
{
VM& vm = globalObject->vm();
PageCount minimum = m_memory->initial();
PageCount maximum = m_memory->maximum();
JSObject* result;
if (maximum.isValid()) {
result = constructEmptyObject(globalObject, globalObject->objectPrototype(), 3);
result->putDirect(vm, Identifier::fromString(vm, "maximum"_s), jsNumber(maximum.pageCount()));
} else
result = constructEmptyObject(globalObject, globalObject->objectPrototype(), 2);
result->putDirect(vm, Identifier::fromString(vm, "minimum"_s), jsNumber(minimum.pageCount()));
result->putDirect(vm, Identifier::fromString(vm, "shared"_s), jsBoolean(m_memory->sharingMode() == MemorySharingMode::Shared));
return result;
}
void JSWebAssemblyMemory::growSuccessCallback(VM& vm, PageCount oldPageCount, PageCount newPageCount)
{
// We need to clear out the old array buffer because it might now be pointing to stale memory.
if (m_buffer) {
if (m_memory->sharingMode() == MemorySharingMode::Default)
m_buffer->detach(vm);
m_buffer = nullptr;
m_bufferWrapper.clear();
}
memory().checkLifetime();
vm.heap.reportExtraMemoryAllocated(this, newPageCount.bytes() - oldPageCount.bytes());
}
void JSWebAssemblyMemory::finishCreation(VM& vm)
{
Base::finishCreation(vm);
ASSERT(inherits(info()));
vm.heap.reportExtraMemoryAllocated(this, memory().size());
}
void JSWebAssemblyMemory::destroy(JSCell* cell)
{
auto memory = static_cast<JSWebAssemblyMemory*>(cell);
memory->JSWebAssemblyMemory::~JSWebAssemblyMemory();
}
template<typename Visitor>
void JSWebAssemblyMemory::visitChildrenImpl(JSCell* cell, Visitor& visitor)
{
auto* thisObject = jsCast<JSWebAssemblyMemory*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
visitor.append(thisObject->m_bufferWrapper);
visitor.reportExtraMemoryVisited(thisObject->memory().size());
}
DEFINE_VISIT_CHILDREN(JSWebAssemblyMemory);
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(WEBASSEMBLY)
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