Optimizing nested, constant object literals (like JSON objects) by building o...

test/mjsunit/object-literal.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.
+
+var obj = {
+    a: 7,
+    b: { x: 12, y: 24 },
+    c: 'Zebra'
+}
+
+assertEquals(7, obj.a);
+assertEquals(12, obj.b.x);
+assertEquals(24, obj.b.y);
+assertEquals('Zebra', obj.c);
+
+var z = 24;
+
+var obj2 = {
+    a: 7,
+    b: { x: 12, y: z },
+    c: 'Zebra'
+}
+
+assertEquals(7, obj2.a);
+assertEquals(12, obj2.b.x);
+assertEquals(24, obj2.b.y);
+assertEquals('Zebra', obj2.c);
+
+var arr = [];
+for (var i = 0; i < 2; i++) {
+  arr[i] = {
+      a: 7,
+      b: { x: 12, y: 24 },
+      c: 'Zebra'
+  }
+}
+
+arr[0].a = 2;
+assertEquals(2, arr[0].a);
+assertEquals(7, arr[1].a);