Fix handling arrays with holes in JSON.stringify.

R=verwaest@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/11273112

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12834 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/json-stringifier.h

@@ -413,20 +413,6 @@ BasicJsonStringifier::Result BasicJsonStringifier::SerializeArray(
       }
       break;
     }
-    case FAST_HOLEY_SMI_ELEMENTS: {
-      Handle<FixedArray> elements = Handle<FixedArray>(
-          FixedArray::cast(object->elements()));
-      for (int i = 0; i < length; i++) {
-        if (i > 0) Append(',');
-        if (elements->is_the_hole(i)) {
-          Append("null");
-        } else {
-          SerializeSmi(Smi::cast(elements->get(i)));
-        }
-      }
-      break;
-    }
-    case FAST_HOLEY_DOUBLE_ELEMENTS:
     case FAST_DOUBLE_ELEMENTS: {
       Handle<FixedDoubleArray> elements = Handle<FixedDoubleArray>(
           FixedDoubleArray::cast(object->elements()));
@@ -436,7 +422,6 @@ BasicJsonStringifier::Result BasicJsonStringifier::SerializeArray(
       }
       break;
     }
-    case FAST_HOLEY_ELEMENTS:
     case FAST_ELEMENTS: {
       Handle<FixedArray> elements = Handle<FixedArray>(
           FixedArray::cast(object->elements()));

test/mjsunit/json2.js

+// 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
+
+var fast_smi = [1, 2, 3, 4];
+fast_smi.__proto__ = [7, 7, 7, 7];
+delete fast_smi[2];
+assertTrue(%HasFastSmiElements(fast_smi));
+assertEquals("[1,2,7,4]", JSON.stringify(fast_smi));
+
+var fast_double = [1.1, 2, 3, 4];
+fast_double.__proto__ = [7, 7, 7, 7];
+
+delete fast_double[2];
+assertTrue(%HasFastDoubleElements(fast_double));
+assertEquals("[1.1,2,7,4]", JSON.stringify(fast_double));
+
+var fast_obj = [1, 2, {}, {}];
+fast_obj.__proto__ = [7, 7, 7, 7];
+
+delete fast_obj[2];
+assertTrue(%HasFastObjectElements(fast_obj));
+assertEquals("[1,2,7,{}]", JSON.stringify(fast_obj));