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APICallbackFunction.h
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132 lines (113 loc) · 5.36 KB
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/*
* Copyright (C) 2013-2020 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.
*/
#ifndef APICallbackFunction_h
#define APICallbackFunction_h
#include "APICast.h"
#include "Error.h"
#include "JSCallbackConstructor.h"
#include "JSLock.h"
#include <wtf/Vector.h>
namespace JSC {
struct APICallbackFunction {
template <typename T> static EncodedJSValue callImpl(JSGlobalObject*, CallFrame*);
template <typename T> static EncodedJSValue constructImpl(JSGlobalObject*, CallFrame*);
};
template <typename T>
EncodedJSValue APICallbackFunction::callImpl(JSGlobalObject* globalObject, CallFrame* callFrame)
{
VM& vm = getVM(globalObject);
auto scope = DECLARE_THROW_SCOPE(vm);
JSContextRef execRef = toRef(globalObject);
JSObjectRef functionRef = toRef(callFrame->jsCallee());
JSObjectRef thisObjRef = toRef(jsCast<JSObject*>(callFrame->thisValue().toThis(globalObject, ECMAMode::sloppy())));
int argumentCount = static_cast<int>(callFrame->argumentCount());
Vector<JSValueRef, 16> arguments;
arguments.reserveInitialCapacity(argumentCount);
for (int i = 0; i < argumentCount; i++)
arguments.uncheckedAppend(toRef(globalObject, callFrame->uncheckedArgument(i)));
JSValueRef exception = nullptr;
JSValueRef result;
{
JSLock::DropAllLocks dropAllLocks(globalObject);
result = jsCast<T*>(toJS(functionRef))->functionCallback()(execRef, functionRef, thisObjRef, argumentCount, arguments.data(), &exception);
}
if (exception) {
throwException(globalObject, scope, toJS(globalObject, exception));
return JSValue::encode(jsUndefined());
}
// result must be a valid JSValue.
if (!result)
return JSValue::encode(jsUndefined());
return JSValue::encode(toJS(globalObject, result));
}
template <typename T>
EncodedJSValue APICallbackFunction::constructImpl(JSGlobalObject* globalObject, CallFrame* callFrame)
{
VM& vm = getVM(globalObject);
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue callee = callFrame->jsCallee();
T* constructor = jsCast<T*>(callFrame->jsCallee());
JSContextRef ctx = toRef(globalObject);
JSObjectRef constructorRef = toRef(constructor);
JSObjectCallAsConstructorCallback callback = constructor->constructCallback();
if (callback) {
JSValue prototype;
JSValue newTarget = callFrame->newTarget();
// If we are doing a derived class construction get the .prototype property off the new target first so we behave closer to normal JS.
if (newTarget != constructor) {
prototype = newTarget.get(globalObject, vm.propertyNames->prototype);
RETURN_IF_EXCEPTION(scope, { });
}
size_t argumentCount = callFrame->argumentCount();
Vector<JSValueRef, 16> arguments;
arguments.reserveInitialCapacity(argumentCount);
for (size_t i = 0; i < argumentCount; ++i)
arguments.uncheckedAppend(toRef(globalObject, callFrame->uncheckedArgument(i)));
JSValueRef exception = nullptr;
JSObjectRef result;
{
JSLock::DropAllLocks dropAllLocks(globalObject);
result = callback(ctx, constructorRef, argumentCount, arguments.data(), &exception);
}
if (exception) {
throwException(globalObject, scope, toJS(globalObject, exception));
return JSValue::encode(jsUndefined());
}
// result must be a valid JSValue.
if (!result)
return throwVMTypeError(globalObject, scope);
JSObject* newObject = toJS(result);
// This won't trigger proxy traps on newObject's prototype handler but that's probably desirable here anyway.
if (newTarget != constructor && newObject->getPrototypeDirect(vm) == constructor->get(globalObject, vm.propertyNames->prototype)) {
RETURN_IF_EXCEPTION(scope, { });
newObject->setPrototype(vm, globalObject, prototype);
RETURN_IF_EXCEPTION(scope, { });
}
return JSValue::encode(newObject);
}
return JSValue::encode(toJS(JSObjectMake(ctx, jsCast<JSCallbackConstructor*>(callee)->classRef(), nullptr)));
}
} // namespace JSC
#endif // APICallbackFunction_h