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/*
* Copyright (C) 2019-2021 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 "WebAssemblyGlobalConstructor.h"
#if ENABLE(WEBASSEMBLY)
#include "JSCInlines.h"
#include "JSWebAssemblyGlobal.h"
#include "JSWebAssemblyHelpers.h"
#include "JSWebAssemblyRuntimeError.h"
#include "WasmFormat.h"
#include "WebAssemblyGlobalPrototype.h"
namespace JSC {
const ClassInfo WebAssemblyGlobalConstructor::s_info = { "Function"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(WebAssemblyGlobalConstructor) };
static JSC_DECLARE_HOST_FUNCTION(constructJSWebAssemblyGlobal);
static JSC_DECLARE_HOST_FUNCTION(callJSWebAssemblyGlobal);
JSC_DEFINE_HOST_FUNCTION(constructJSWebAssemblyGlobal, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
JSObject* newTarget = asObject(callFrame->newTarget());
Structure* webAssemblyGlobalStructure = JSC_GET_DERIVED_STRUCTURE(vm, webAssemblyGlobalStructure, newTarget, callFrame->jsCallee());
RETURN_IF_EXCEPTION(throwScope, { });
JSObject* globalDescriptor;
{
JSValue argument = callFrame->argument(0);
if (!argument.isObject())
return throwVMTypeError(globalObject, throwScope, "WebAssembly.Global expects its first argument to be an object"_s);
globalDescriptor = jsCast<JSObject*>(argument);
}
Wasm::Mutability mutability;
{
Identifier mutableIdent = Identifier::fromString(vm, "mutable"_s);
JSValue mutableValue = globalDescriptor->get(globalObject, mutableIdent);
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
bool mutableBoolean = mutableValue.toBoolean(globalObject);
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
if (mutableBoolean)
mutability = Wasm::Mutable;
else
mutability = Wasm::Immutable;
}
Wasm::Type type;
{
Identifier valueIdent = Identifier::fromString(vm, "value"_s);
JSValue valueValue = globalDescriptor->get(globalObject, valueIdent);
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
String valueString = valueValue.toWTFString(globalObject);
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
if (valueString == "i32"_s)
type = Wasm::Types::I32;
else if (valueString == "i64"_s)
type = Wasm::Types::I64;
else if (valueString == "f32"_s)
type = Wasm::Types::F32;
else if (valueString == "f64"_s)
type = Wasm::Types::F64;
else if (valueString == "anyfunc"_s || valueString == "funcref"_s)
type = Wasm::funcrefType();
else if (valueString == "externref"_s)
type = Wasm::externrefType();
else
return throwVMTypeError(globalObject, throwScope, "WebAssembly.Global expects its 'value' field to be the string 'i32', 'i64', 'f32', 'f64', 'anyfunc', 'funcref', or 'externref'"_s);
}
uint64_t initialValue = 0;
JSValue argument = callFrame->argument(1);
switch (type.kind) {
case Wasm::TypeKind::I32: {
if (!argument.isUndefined()) {
int32_t value = argument.toInt32(globalObject);
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
initialValue = static_cast<uint64_t>(std::bit_cast<uint32_t>(value));
}
break;
}
case Wasm::TypeKind::I64: {
if (!argument.isUndefined()) {
int64_t value = argument.toBigInt64(globalObject);
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
initialValue = static_cast<uint64_t>(value);
}
break;
}
case Wasm::TypeKind::F32: {
if (!argument.isUndefined()) {
float value = argument.toFloat(globalObject);
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
initialValue = static_cast<uint64_t>(std::bit_cast<uint32_t>(value));
}
break;
}
case Wasm::TypeKind::F64: {
if (!argument.isUndefined()) {
double value = argument.toNumber(globalObject);
RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
initialValue = std::bit_cast<uint64_t>(value);
}
break;
}
case Wasm::TypeKind::V128:
RELEASE_ASSERT_NOT_REACHED();
break;
default: {
if (Wasm::isFuncref(type)) {
if (argument.isUndefined())
argument = defaultValueForReferenceType(type);
if (!isWebAssemblyHostFunction(argument) && !argument.isNull())
return throwVMTypeError(globalObject, throwScope, "Argument value did not match the reference type"_s);
initialValue = JSValue::encode(argument);
} else if (Wasm::isExternref(type)) {
if (argument.isUndefined())
argument = defaultValueForReferenceType(type);
initialValue = JSValue::encode(argument);
} else if (Wasm::isExternref(type))
return throwVMTypeError(globalObject, throwScope, "I31ref import from JS currently unsupported"_s);
else
RELEASE_ASSERT_NOT_REACHED();
}
}
Ref<Wasm::Global> wasmGlobal = Wasm::Global::create(type, mutability, initialValue);
JSWebAssemblyGlobal* jsWebAssemblyGlobal = JSWebAssemblyGlobal::create(vm, webAssemblyGlobalStructure, WTFMove(wasmGlobal));
ensureStillAliveHere(initialValue); // Ensure this is kept alive while creating JSWebAssemblyGlobal.
return JSValue::encode(jsWebAssemblyGlobal);
}
JSC_DEFINE_HOST_FUNCTION(callJSWebAssemblyGlobal, (JSGlobalObject* globalObject, CallFrame*))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
return JSValue::encode(throwConstructorCannotBeCalledAsFunctionTypeError(globalObject, scope, "WebAssembly.Global"_s));
}
WebAssemblyGlobalConstructor* WebAssemblyGlobalConstructor::create(VM& vm, Structure* structure, WebAssemblyGlobalPrototype* thisPrototype)
{
auto* constructor = new (NotNull, allocateCell<WebAssemblyGlobalConstructor>(vm)) WebAssemblyGlobalConstructor(vm, structure);
constructor->finishCreation(vm, thisPrototype);
return constructor;
}
Structure* WebAssemblyGlobalConstructor::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(InternalFunctionType, StructureFlags), info());
}
void WebAssemblyGlobalConstructor::finishCreation(VM& vm, WebAssemblyGlobalPrototype* prototype)
{
Base::finishCreation(vm, 1, "Global"_s, PropertyAdditionMode::WithoutStructureTransition);
putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, PropertyAttribute::DontEnum | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly);
}
WebAssemblyGlobalConstructor::WebAssemblyGlobalConstructor(VM& vm, Structure* structure)
: Base(vm, structure, callJSWebAssemblyGlobal, constructJSWebAssemblyGlobal)
{
}
} // namespace JSC
#endif // ENABLE(WEBASSEMBLY)
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