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/*
* Copyright (C) 2016-2017 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 "JSWebAssemblyTable.h"
#if ENABLE(WEBASSEMBLY)
#include "JSCInlines.h"
#include "WasmFormat.h"
#include <wtf/CheckedArithmetic.h>
namespace JSC {
const ClassInfo JSWebAssemblyTable::s_info = { "WebAssembly.Table", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSWebAssemblyTable) };
JSWebAssemblyTable* JSWebAssemblyTable::create(ExecState* exec, VM& vm, Structure* structure, uint32_t initial, std::optional<uint32_t> maximum)
{
auto throwScope = DECLARE_THROW_SCOPE(vm);
auto* globalObject = exec->lexicalGlobalObject();
auto exception = [&] (JSObject* error) {
throwException(exec, throwScope, error);
return nullptr;
};
if (!globalObject->webAssemblyEnabled())
return exception(createEvalError(exec, globalObject->webAssemblyDisabledErrorMessage()));
if (!isValidSize(initial))
return exception(createOutOfMemoryError(exec));
auto* instance = new (NotNull, allocateCell<JSWebAssemblyTable>(vm.heap)) JSWebAssemblyTable(vm, structure, initial, maximum);
instance->finishCreation(vm);
return instance;
}
Structure* JSWebAssemblyTable::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
}
JSWebAssemblyTable::JSWebAssemblyTable(VM& vm, Structure* structure, uint32_t initial, std::optional<uint32_t> maximum)
: Base(vm, structure)
{
m_size = initial;
ASSERT(isValidSize(m_size));
m_maximum = maximum;
ASSERT(!m_maximum || *m_maximum >= m_size);
// FIXME: It might be worth trying to pre-allocate maximum here. The spec recommends doing so.
// But for now, we're not doing that.
m_functions = MallocPtr<Wasm::CallableFunction>::malloc(sizeof(Wasm::CallableFunction) * static_cast<size_t>(m_size));
m_jsFunctions = MallocPtr<WriteBarrier<JSObject>>::malloc(sizeof(WriteBarrier<JSObject>) * static_cast<size_t>(m_size));
for (uint32_t i = 0; i < m_size; ++i) {
new (&m_functions.get()[i]) Wasm::CallableFunction();
ASSERT(m_functions.get()[i].signatureIndex == Wasm::Signature::invalidIndex); // We rely on this in compiled code.
new (&m_jsFunctions.get()[i]) WriteBarrier<JSObject>();
}
}
void JSWebAssemblyTable::finishCreation(VM& vm)
{
Base::finishCreation(vm);
ASSERT(inherits(vm, info()));
}
void JSWebAssemblyTable::destroy(JSCell* cell)
{
static_cast<JSWebAssemblyTable*>(cell)->JSWebAssemblyTable::~JSWebAssemblyTable();
}
void JSWebAssemblyTable::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
JSWebAssemblyTable* thisObject = jsCast<JSWebAssemblyTable*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
for (unsigned i = 0; i < thisObject->m_size; ++i)
visitor.append(thisObject->m_jsFunctions.get()[i]);
}
bool JSWebAssemblyTable::grow(uint32_t delta)
{
if (delta == 0)
return true;
Checked<uint32_t, RecordOverflow> newSizeChecked = m_size;
newSizeChecked += delta;
uint32_t newSize;
if (newSizeChecked.safeGet(newSize) == CheckedState::DidOverflow)
return false;
if (maximum() && newSize > *maximum())
return false;
if (!isValidSize(newSize))
return false;
m_functions.realloc(sizeof(Wasm::CallableFunction) * static_cast<size_t>(newSize));
m_jsFunctions.realloc(sizeof(WriteBarrier<JSObject>) * static_cast<size_t>(newSize));
for (uint32_t i = m_size; i < newSize; ++i) {
new (&m_functions.get()[i]) Wasm::CallableFunction();
new (&m_jsFunctions.get()[i]) WriteBarrier<JSObject>();
}
m_size = newSize;
return true;
}
void JSWebAssemblyTable::clearFunction(uint32_t index)
{
RELEASE_ASSERT(index < m_size);
m_jsFunctions.get()[index] = WriteBarrier<JSObject>();
m_functions.get()[index] = Wasm::CallableFunction();
ASSERT(m_functions.get()[index].signatureIndex == Wasm::Signature::invalidIndex); // We rely on this in compiled code.
}
void JSWebAssemblyTable::setFunction(VM& vm, uint32_t index, WebAssemblyFunction* function)
{
RELEASE_ASSERT(index < m_size);
m_jsFunctions.get()[index].set(vm, this, function);
m_functions.get()[index] = function->callableFunction();
}
void JSWebAssemblyTable::setFunction(VM& vm, uint32_t index, WebAssemblyWrapperFunction* function)
{
RELEASE_ASSERT(index < m_size);
m_jsFunctions.get()[index].set(vm, this, function);
m_functions.get()[index] = function->callableFunction();
}
} // namespace JSC
#endif // ENABLE(WEBASSEMBLY)
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