Fix a bug in delete for lookup slots.

test/mjsunit/regress/regress-70066.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.
+
+// Regression test for Chromium issue 70066.  Delete should work properly
+// from inside 'with' scopes.
+// http://code.google.com/p/chromium/issues/detail?id=70066
+
+x = 0;
+
+// Delete on a slot from a function's own context.
+function test1() {
+  var value = 1;
+  var status;
+  with ({}) { status = delete value; }
+  return value + ":" + status;
+}
+
+assertEquals("1:false", test1(), "test1");
+assertEquals(0, x, "test1");  // Global x is undisturbed.
+
+
+// Delete on a slot from an outer context.
+function test2() {
+  function f() {
+    with ({}) { return delete value; }
+  }
+  var value = 2;
+  var status = f();
+  return value + ":" + status;
+}
+
+assertEquals("2:false", test2(), "test2");
+assertEquals(0, x, "test2");  // Global x is undisturbed.
+
+
+// Delete on an argument (should be the same code paths as test1 and test2).
+function test3(value) {
+  var status;
+  with ({}) { status = delete value; }
+  return value + ":" + status;
+}
+
+assertEquals("3:false", test3(3), "test3");
+assertEquals(0, x, "test3");  // Global x is undisturbed.
+
+function test4(value) {
+  function f() {
+    with ({}) { return delete value; }
+  }
+  var status = f();
+  return value + ":" + status;
+}
+
+assertEquals("4:false", test4(4), "test4");
+assertEquals(0, x, "test4");  // Global x is undisturbed.
+
+
+// Delete on an argument found in the arguments object.  Such properties are
+// normally DONT_DELETE in JavaScript but deletion is allowed by V8.
+function test5(value) {
+  var status;
+  with ({}) { status = delete value; }
+  return arguments[0] + ":" + status;
+}
+
+assertEquals("undefined:true", test5(5), "test5");
+assertEquals(0, x, "test5");  // Global x is undisturbed.
+
+function test6(value) {
+  function f() {
+    with ({}) { return delete value; }
+  }
+  var status = f();
+  return arguments[0] + ":" + status;
+}
+
+assertEquals("undefined:true", test6(6), "test6");
+assertEquals(0, x, "test6");  // Global x is undisturbed.
+
+
+// Delete on a property found on 'with' object.
+function test7(object) {
+  with (object) { return delete value; }
+}
+
+var o = {value: 7};
+assertEquals(true, test7(o), "test7");
+assertEquals(void 0, o.value, "test7");
+assertEquals(0, x, "test7");  // Global x is undisturbed.
+
+
+// Delete on a global property.
+function test8() {
+  with ({}) { return delete x; }
+}
+
+assertEquals(true, test8(), "test8");
+assertThrows("x", "test8");  // Global x should be deleted.
+
+
+// Delete on a property that is not found anywhere.
+function test9() {
+  with ({}) { return delete x; }
+}
+
+assertThrows("x", "test9");  // Make sure it's not there.
+assertEquals(true, test9(), "test9");
+
+
+// Delete on a DONT_DELETE property of the global object.
+var y = 10;
+function test10() {
+  with ({}) { return delete y; }
+}
+
+assertEquals(false, test10(), "test10");
+assertEquals(10, y, "test10");