Preliminary code for block scopes and block contexts.

test/mjsunit/harmony/block-scoping.js

Index: test/mjsunit/harmony/block-scoping.js
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+// Copyright 2008 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: --allow-natives-syntax --harmony-block-scoping
+// Test functionality of block scopes.
+
+// Hoisting of var declarations.
+function f1() {
+  {
+    var x = 1;
+    var y;
+  }
+  assertEquals(1, x)
+  assertEquals(undefined, y)
+}
+f1();
+
+// Dynamic lookup through block scopes.
+function f2(one) {
+  var x = one + 1;
+  // TODO(keuchel): introduce let
+  // let y = one + 2;
+  if (one == 1) {
+    // Parameter
+    assertEquals(1, eval('one'));
+    // Function local var variable
+    assertEquals(2, eval('x'));
+    // Function local let variable
+    // TODO(keuchel): introduce let
+    // assertEquals(3, eval('y'));
+  }
+}
+f2(1);
+