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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/runtime/runtime-utils.h"
#include "src/arguments.h"
#include "src/elements.h"
#include "src/factory.h"
#include "src/isolate-inl.h"
#include "src/objects-inl.h"
namespace v8 {
namespace internal {
// ES6 9.5.13 [[Call]] (thisArgument, argumentsList)
RUNTIME_FUNCTION(Runtime_JSProxyCall) {
HandleScope scope(isolate);
DCHECK_LE(2, args.length());
// thisArgument == receiver
CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 0);
CONVERT_ARG_HANDLE_CHECKED(JSProxy, proxy, args.length() - 1);
Handle<String> trap_name = isolate->factory()->apply_string();
// 1. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 2. If handler is null, throw a TypeError exception.
if (proxy->IsRevoked()) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kProxyRevoked, trap_name));
}
// 3. Assert: Type(handler) is Object.
DCHECK(handler->IsJSReceiver());
// 4. Let target be the value of the [[ProxyTarget]] internal slot of O.
Handle<JSReceiver> target(proxy->target(), isolate);
// 5. Let trap be ? GetMethod(handler, "apply").
Handle<Object> trap;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, trap,
Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name));
// 6. If trap is undefined, then
int const arguments_length = args.length() - 2;
if (trap->IsUndefined(isolate)) {
// 6.a. Return Call(target, thisArgument, argumentsList).
ScopedVector<Handle<Object>> argv(arguments_length);
for (int i = 0; i < arguments_length; ++i) {
argv[i] = args.at<Object>(i + 1);
}
RETURN_RESULT_OR_FAILURE(
isolate, Execution::Call(isolate, target, receiver, arguments_length,
argv.start()));
}
// 7. Let argArray be CreateArrayFromList(argumentsList).
Handle<JSArray> arg_array = isolate->factory()->NewJSArray(
FAST_ELEMENTS, arguments_length, arguments_length);
ElementsAccessor* accessor = arg_array->GetElementsAccessor();
{
DisallowHeapAllocation no_gc;
for (int i = 0; i < arguments_length; i++) {
accessor->Set(arg_array, i, args[i + 1]);
}
}
// 8. Return Call(trap, handler, «target, thisArgument, argArray»).
Handle<Object> trap_args[] = {target, receiver, arg_array};
RETURN_RESULT_OR_FAILURE(
isolate,
Execution::Call(isolate, trap, handler, arraysize(trap_args), trap_args));
}
// 9.5.14 [[Construct]] (argumentsList, newTarget)
RUNTIME_FUNCTION(Runtime_JSProxyConstruct) {
HandleScope scope(isolate);
DCHECK_LE(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSProxy, proxy, args.length() - 2);
CONVERT_ARG_HANDLE_CHECKED(Object, new_target, args.length() - 1);
Handle<String> trap_name = isolate->factory()->construct_string();
// 1. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 2. If handler is null, throw a TypeError exception.
if (proxy->IsRevoked()) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kProxyRevoked, trap_name));
}
// 3. Assert: Type(handler) is Object.
DCHECK(handler->IsJSReceiver());
// 4. Let target be the value of the [[ProxyTarget]] internal slot of O.
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()), isolate);
// 5. Let trap be ? GetMethod(handler, "construct").
Handle<Object> trap;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, trap,
Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name));
// 6. If trap is undefined, then
int const arguments_length = args.length() - 3;
if (trap->IsUndefined(isolate)) {
// 6.a. Assert: target has a [[Construct]] internal method.
DCHECK(target->IsConstructor());
// 6.b. Return Construct(target, argumentsList, newTarget).
ScopedVector<Handle<Object>> argv(arguments_length);
for (int i = 0; i < arguments_length; ++i) {
argv[i] = args.at<Object>(i + 1);
}
RETURN_RESULT_OR_FAILURE(
isolate, Execution::New(isolate, target, new_target, arguments_length,
argv.start()));
}
// 7. Let argArray be CreateArrayFromList(argumentsList).
Handle<JSArray> arg_array = isolate->factory()->NewJSArray(
FAST_ELEMENTS, arguments_length, arguments_length);
ElementsAccessor* accessor = arg_array->GetElementsAccessor();
{
DisallowHeapAllocation no_gc;
for (int i = 0; i < arguments_length; i++) {
accessor->Set(arg_array, i, args[i + 1]);
}
}
// 8. Let newObj be ? Call(trap, handler, «target, argArray, newTarget »).
Handle<Object> new_object;
Handle<Object> trap_args[] = {target, arg_array, new_target};
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, new_object,
Execution::Call(isolate, trap, handler, arraysize(trap_args), trap_args));
// 9. If Type(newObj) is not Object, throw a TypeError exception.
if (!new_object->IsJSReceiver()) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate,
NewTypeError(MessageTemplate::kProxyConstructNonObject, new_object));
}
// 10. Return newObj.
return *new_object;
}
RUNTIME_FUNCTION(Runtime_IsJSProxy) {
SealHandleScope shs(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_CHECKED(Object, obj, 0);
return isolate->heap()->ToBoolean(obj->IsJSProxy());
}
RUNTIME_FUNCTION(Runtime_JSProxyGetHandler) {
SealHandleScope shs(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_CHECKED(JSProxy, proxy, 0);
return proxy->handler();
}
RUNTIME_FUNCTION(Runtime_JSProxyGetTarget) {
SealHandleScope shs(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_CHECKED(JSProxy, proxy, 0);
return proxy->target();
}
RUNTIME_FUNCTION(Runtime_JSProxyRevoke) {
HandleScope scope(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_HANDLE_CHECKED(JSProxy, proxy, 0);
JSProxy::Revoke(proxy);
return isolate->heap()->undefined_value();
}
} // namespace internal
} // namespace v8
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