src/third_party/v8/src/builtins/proxy-revocable.tq

// Copyright 2019 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/builtins/builtins-proxy-gen.h'

namespace proxy {

extern macro ProxiesCodeStubAssembler::AllocateProxyRevokeFunction(
    implicit context: Context)(JSProxy): JSFunction;

// Proxy.revocable(target, handler)
// https://tc39.github.io/ecma262/#sec-proxy.revocable
transitioning javascript builtin
ProxyRevocable(js-implicit context: NativeContext)(
    target: JSAny, handler: JSAny): JSProxyRevocableResult {
  try {
    // 1. Let p be ? ProxyCreate(target, handler).
    const targetJSReceiver =
        Cast<JSReceiver>(target) otherwise ThrowProxyNonObject;
    const handlerJSReceiver =
        Cast<JSReceiver>(handler) otherwise ThrowProxyNonObject;
    const proxy: JSProxy = AllocateProxy(targetJSReceiver, handlerJSReceiver);

    // 2. Let steps be the algorithm steps defined in Proxy Revocation
    // Functions.
    // 3. Let revoker be CreateBuiltinFunction(steps, « [[RevocableProxy]] »).
    // 4. Set revoker.[[RevocableProxy]] to p.
    const revoke: JSFunction = AllocateProxyRevokeFunction(proxy);

    // 5. Let result be ObjectCreate(%ObjectPrototype%).
    // 6. Perform CreateDataProperty(result, "proxy", p).
    // 7. Perform CreateDataProperty(result, "revoke", revoker).
    // 8. Return result.
    return NewJSProxyRevocableResult(proxy, revoke);
  } label ThrowProxyNonObject deferred {
    ThrowTypeError(MessageTemplate::kProxyNonObject, 'Proxy.revocable');
  }
}
}