Implement flag and source getters on RegExp.prototype.

test/mjsunit/regexp.js

 // Copyright 2012 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
@@ skipping 587 matching lines @@
 // And one more time, just to be certain.
 log = [];
 re.lastIndex = fakeLastIndex;
 result = re.exec(fakeString);
 assertEquals(["str"], result);
 assertEquals(["ts", "li"], log);
 
 
 // Check that properties of RegExp have the correct permissions.
 var re = /x/g;
-var desc = Object.getOwnPropertyDescriptor(re, "global");
-assertEquals(true, desc.value);
-assertEquals(false, desc.configurable);

[Dan Ehrenberg, 2015/11/02 19:21:06]

Why not leave part of this in, just to check that re doesn't have "global" and
friends as own properties?

+var desc = Object.getOwnPropertyDescriptor(re.__proto__, "global");
+assertInstanceof(desc.get, Function);
+assertEquals(true, desc.configurable);
 assertEquals(false, desc.enumerable);
-assertEquals(false, desc.writable);
 
-desc = Object.getOwnPropertyDescriptor(re, "multiline");
-assertEquals(false, desc.value);
-assertEquals(false, desc.configurable);
+desc = Object.getOwnPropertyDescriptor(re.__proto__, "multiline");
+assertInstanceof(desc.get, Function);
+assertEquals(true, desc.configurable);
 assertEquals(false, desc.enumerable);
-assertEquals(false, desc.writable);
 
-desc = Object.getOwnPropertyDescriptor(re, "ignoreCase");
-assertEquals(false, desc.value);
-assertEquals(false, desc.configurable);
+desc = Object.getOwnPropertyDescriptor(re.__proto__, "ignoreCase");
+assertInstanceof(desc.get, Function);
+assertEquals(true, desc.configurable);
 assertEquals(false, desc.enumerable);
-assertEquals(false, desc.writable);
 
 desc = Object.getOwnPropertyDescriptor(re, "lastIndex");
 assertEquals(0, desc.value);
 assertEquals(false, desc.configurable);
 assertEquals(false, desc.enumerable);
 assertEquals(true, desc.writable);
 
 
 // Check that end-anchored regexps are optimized correctly.
 var re = /(?:a|bc)g$/;
@@ skipping 74 matching lines @@
 // Test that RegExp.prototype.toString() throws TypeError for
 // incompatible receivers (ES5 section 15.10.6 and 15.10.6.4).
 assertThrows("RegExp.prototype.toString.call(null)", TypeError);
 assertThrows("RegExp.prototype.toString.call(0)", TypeError);
 assertThrows("RegExp.prototype.toString.call('')", TypeError);
 assertThrows("RegExp.prototype.toString.call(false)", TypeError);
 assertThrows("RegExp.prototype.toString.call(true)", TypeError);
 assertThrows("RegExp.prototype.toString.call([])", TypeError);
 assertThrows("RegExp.prototype.toString.call({})", TypeError);
 assertThrows("RegExp.prototype.toString.call(function(){})", TypeError);