Force context allocation for variables in generator scopes.

test/mjsunit/harmony/generators-instantiation.js

 // Copyright 2013 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.x = 0;
+// Flags: --harmony-generators --harmony-scoping
 
-var p = {};
-Object.defineProperty(p, "x", {writable:false, value:5});
-this.__proto__ = p;
+// Test instantations of generators.
 
-function s(v) {
-  v.x = 1;
+// Generators shouldn't allocate stack slots.  This test will abort in debug
+// mode if generators have stack slots.
+function TestContextAllocation() {
+  function* g1(a, b, c) { yield 1; return [a, b, c]; }
+  function* g2() { yield 1; return arguments; }
+  function* g3() { yield 1; return this; }
+  function* g4() { var x = 10; yield 1; return x; }
+  // Temporary variable context allocation
+  function* g5(l) { "use strict"; yield 1; for (let x in l) { yield x; } }
+
+  g1();
+  g2();
+  g3();
+  g4();
+  g5(["foo"]);
 }
 
-function s_strict(v) {
-  "use strict";
-  v.x = 1;
-}
-
-function c(p) {
-  return {__proto__: p};
-}
-
-var o1 = c(this);
-var o2 = c(this);
-
-// Initialize the store IC.
-s(c(this));
-s(c(this));
-s_strict(c(this));
-s_strict(c(this));
-
-delete this.x;
-
-// Verify that direct setting fails.
-o1.x = 20;
-assertEquals(5, o1.x);
-
-// Verify that setting through the IC fails.
-s(o2);
-assertEquals(5, o2.x);
-assertThrows("s_strict(o2);", TypeError);
+TestContextAllocation();