Use the syntax of a property addition as a hint for controlling the fast-mode vs. dictionary mode h…

test/mjsunit/fast-non-keyed.js

Index: test/mjsunit/fast-non-keyed.js
===================================================================
--- test/mjsunit/fast-non-keyed.js	(revision 0)
+++ test/mjsunit/fast-non-keyed.js	(revision 0)
@@ -0,0 +1,76 @@
+// Copyright 2012 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
+
+// Check that keyed stores make things go dict mode faster than non-keyed
+// stores.
+
+function AddProps(obj) {
+  for (var i = 0; i < 26; i++) {
+    obj["x" + i] = 0;
+  }
+}
+
+
+function AddPropsNonKeyed(obj) {
+  obj.x0 = 0;
+  obj.x1 = 0;
+  obj.x2 = 0;
+  obj.x3 = 0;
+  obj.x4 = 0;
+  obj.x5 = 0;
+  obj.x6 = 0;
+  obj.x7 = 0;
+  obj.x8 = 0;
+  obj.x9 = 0;
+  obj.x10 = 0;
+  obj.x11 = 0;
+  obj.x12 = 0;
+  obj.x13 = 0;
+  obj.x14 = 0;
+  obj.x15 = 0;
+  obj.x16 = 0;
+  obj.x17 = 0;
+  obj.x18 = 0;
+  obj.x19 = 0;
+  obj.x20 = 0;
+  obj.x21 = 0;
+  obj.x22 = 0;
+  obj.x23 = 0;
+  obj.x24 = 0;
+  obj.x25 = 0;
+}
+
+
+var keyed = {};
+AddProps(keyed);
+assertFalse(%HasFastProperties(keyed));
+
+var non_keyed = {};
+AddPropsNonKeyed(non_keyed);
+assertTrue(%HasFastProperties(non_keyed));