Optimize isFinite and isNaN.

test/mjsunit/builtins.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.
-
-// Flags: --expose-natives-as=builtins
-
-// Checks that all function properties of the builtin object are neither
-// writable nor configurable. Also, theose functions that are actually
-// constructors (recognized by having properties on their .prototype object),
-// have only unconfigurable properties on the prototype, and the methods
-// are also non-writable.
-
-var names = Object.getOwnPropertyNames(builtins);
-
-function isFunction(obj) {
-  return typeof obj == "function";
-}
-
-function checkConstructor(func, name) {
-  // A constructor is a function with a prototype and properties on the
-  // prototype object besides "constructor";
-  if (name.charAt(0) == "$") return;
-  if (typeof func.prototype != "object") return;
-  var propNames = Object.getOwnPropertyNames(func.prototype);
-  if (propNames.length == 0 ||
-      (propNames.length == 1 && propNames[0] == "constructor")) {
-    // Not a constructor.
-    return;
-  }
-  var proto_desc = Object.getOwnPropertyDescriptor(func, "prototype");
-  assertTrue(proto_desc.hasOwnProperty("value"), name);
-  assertFalse(proto_desc.writable, name);
-  assertFalse(proto_desc.configurable, name);
-  var prototype = proto_desc.value;
-  assertEquals(null, prototype.__proto__, name);
-  assertFalse(Object.isExtensible(prototype), name);
-  for (var i = 0; i < propNames.length; i++) {
-    var propName = propNames[i];
-    if (propName == "constructor") continue;
-    var testName = name + "-" + propName;
-    var propDesc = Object.getOwnPropertyDescriptor(prototype, propName);
-    assertTrue(propDesc.hasOwnProperty("value"), testName);
-    assertFalse(propDesc.configurable, testName);
-    if (isFunction(propDesc.value)) {
-      assertFalse(propDesc.writable, testName);
-    }
-  }
-}
-
-for (var i = 0; i < names.length; i++) {
-  var name = names[i];
-  var desc = Object.getOwnPropertyDescriptor(builtins, name);
-  assertTrue(desc.hasOwnProperty("value"));
-  var value = desc.value;
-  if (isFunction(value)) {
-    assertFalse(desc.writable, name);
-    assertFalse(desc.configurable, name);
-    checkConstructor(value, name);
-  }
-}