Fix small spec violation in String.prototype.split.

Also slightly extended the test coverage.

R=rossberg@chromium.org
BUG=v8:3026
LOG=Y

Review URL: https://codereview.chromium.org/119093002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18405 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/string.js

@@ -616,24 +616,22 @@ function StringSplit(separator, limit) {
   var subject = TO_STRING_INLINE(this);
   limit = (IS_UNDEFINED(limit)) ? 0xffffffff : TO_UINT32(limit);
 
-  // ECMA-262 says that if separator is undefined, the result should
-  // be an array of size 1 containing the entire string.
-  if (IS_UNDEFINED(separator)) {
-    return [subject];
-  }
-
   var length = subject.length;
   if (!IS_REGEXP(separator)) {
-    separator = TO_STRING_INLINE(separator);
+    var separator_string = TO_STRING_INLINE(separator);
 
     if (limit === 0) return [];
 
-    var separator_length = separator.length;
+    // ECMA-262 says that if separator is undefined, the result should
+    // be an array of size 1 containing the entire string.
+    if (IS_UNDEFINED(separator)) return [subject];
+
+    var separator_length = separator_string.length;
 
     // If the separator string is empty then return the elements in the subject.
     if (separator_length === 0) return %StringToArray(subject, limit);
 
-    var result = %StringSplit(subject, separator, limit);
+    var result = %StringSplit(subject, separator_string, limit);
 
     return result;
   }

test/mjsunit/regress/regress-3026.js

+// Copyright 2013 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.
+
+assertEquals([], "abc".split(undefined, 0));

test/mjsunit/string-split.js

@@ -145,3 +145,22 @@ for (var i = 0; i < 128; i++) {
   assertEquals(1, split_chars[i].length);
   assertEquals(i, split_chars[i].charCodeAt(0));
 }
+
+// Check that the separator is converted to string before returning due to
+// limit == 0.
+var counter = 0;
+var separator = { toString: function() { counter++; return "b"; }};
+assertEquals([], "abc".split(separator, 0));
+assertEquals(1, counter);
+
+// Check that the subject is converted to string before the separator.
+counter = 0;
+var subject = { toString: function() { assertEquals(0, counter);
+                                       counter++;
+                                       return "abc"; }};
+separator = { toString: function() { assertEquals(1, counter);
+                                     counter++;
+                                     return "b"; }};
+
+assertEquals(["a", "c"], String.prototype.split.call(subject, separator));
+assertEquals(2, counter);