Version 3.7.1

src/weakmap.js

-// Copyright 2011 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * 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.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "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 THE COPYRIGHT
-// OWNER 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.
-
-
-// This file relies on the fact that the following declaration has been made
-// in runtime.js:
-// const $Object = global.Object;
-const $WeakMap = global.WeakMap;
-
-// -------------------------------------------------------------------
-
-function WeakMapConstructor() {
-  if (%_IsConstructCall()) {
-    %WeakMapInitialize(this);
-  } else {
-    return new $WeakMap();
-  }
-}
-
-
-function WeakMapGet(key) {
-  if (!IS_SPEC_OBJECT(key)) {
-    throw %MakeTypeError('invalid_weakmap_key', [this, key]);
-  }
-  return %WeakMapGet(this, key);
-}
-
-
-function WeakMapSet(key, value) {
-  if (!IS_SPEC_OBJECT(key)) {
-    throw %MakeTypeError('invalid_weakmap_key', [this, key]);
-  }
-  return %WeakMapSet(this, key, value);
-}
-
-
-function WeakMapHas(key) {
-  if (!IS_SPEC_OBJECT(key)) {
-    throw %MakeTypeError('invalid_weakmap_key', [this, key]);
-  }
-  return !IS_UNDEFINED(%WeakMapGet(this, key));
-}
-
-
-function WeakMapDelete(key) {
-  if (!IS_SPEC_OBJECT(key)) {
-    throw %MakeTypeError('invalid_weakmap_key', [this, key]);
-  }
-  if (!IS_UNDEFINED(%WeakMapGet(this, key))) {
-    %WeakMapSet(this, key, void 0);
-    return true;
-  } else {
-    return false;
-  }
-}
-
-// -------------------------------------------------------------------
-
-(function () {
-  %CheckIsBootstrapping();
-  // Set up the WeakMap constructor function.
-  %SetCode($WeakMap, WeakMapConstructor);
-
-  // Set up the constructor property on the WeakMap prototype object.
-  %SetProperty($WeakMap.prototype, "constructor", $WeakMap, DONT_ENUM);
-
-  // Set up the non-enumerable functions on the WeakMap prototype object.
-  InstallFunctionsOnHiddenPrototype($WeakMap.prototype, DONT_ENUM, $Array(
-    "get", WeakMapGet,
-    "set", WeakMapSet,
-    "has", WeakMapHas,
-    "delete", WeakMapDelete
-  ));
-})();