Speed up access to global variables from eval scopes. Traverse the...

test/mjsunit/global-load-from-nested-eval.js

+// Copyright 2009 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.
+
+// Tests global loads from nested eval.
+
+var x = 42;
+
+// Load the global.
+function test(source) {
+  eval('eval(' + source +')');
+}
+test('assertEquals(42, x)');
+
+// Shadow variable with a with statement.
+function testWith(source) {
+  with ({ x: 1 }) {
+    eval('eval(' + source +')');
+  }
+}
+testWith('assertEquals(1, x)');
+
+// Shadow variable with an eval-introduced variable.
+function testEval(source) {
+  eval('var x = 1');
+  function f() {
+    eval('eval('+ source + ')');
+  }
+  f();
+}
+testEval('assertEquals(1, x)');
+
+// Eval that does not shadow.
+function testEvalDontShadow(source) {
+  eval('1');
+  eval('eval(' + source +')');
+}
+testEvalDontShadow('assertEquals(42, x)');
+
+
+
+
+