Correctly reset lastIndex in an RegExp object.

R=svenpanne@chromium.org
BUG=170856

Review URL: https://chromiumcodereview.appspot.com/11896060

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13471 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects-inl.h

@@ -5009,10 +5009,14 @@ void JSRegExp::SetDataAtUnchecked(int index, Object* value, Heap* heap) {
 }
 
 
-void JSRegExp::ResetLastIndex() {
-  InObjectPropertyAtPut(JSRegExp::kLastIndexFieldIndex,
-                        Smi::FromInt(0),
-                        SKIP_WRITE_BARRIER);  // It's a Smi.
+void JSRegExp::ResetLastIndex(Isolate* isolate,
+                              Handle<JSRegExp> regexp) {
+  // Reset lastIndex property to 0.
+  SetProperty(regexp,
+              isolate->factory()->last_index_symbol(),
+              Handle<Smi>(Smi::FromInt(0)),
+              ::NONE,
+              kNonStrictMode);
 }
 
 

src/objects.h

@@ -6573,7 +6573,8 @@ class JSRegExp: public JSObject {
   inline Object* DataAtUnchecked(int index);
   inline void SetDataAtUnchecked(int index, Object* value, Heap* heap);
   inline Type TypeTagUnchecked();
-  inline void ResetLastIndex();
+
+  static inline void ResetLastIndex(Isolate* isolate, Handle<JSRegExp> regexp);
 
   static int code_index(bool is_ascii) {
     if (is_ascii) {

src/runtime.cc

@@ -1794,7 +1794,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_RegExpInitializeObject) {
         JSRegExp::kIgnoreCaseFieldIndex, ignoreCase, SKIP_WRITE_BARRIER);
     regexp->InObjectPropertyAtPut(
         JSRegExp::kMultilineFieldIndex, multiline, SKIP_WRITE_BARRIER);
-    regexp->ResetLastIndex();
+    regexp->InObjectPropertyAtPut(
+        JSRegExp::kLastIndexFieldIndex, Smi::FromInt(0), SKIP_WRITE_BARRIER);
     return regexp;
   }
 
@@ -2911,7 +2912,7 @@ MUST_USE_RESULT static MaybeObject* StringReplaceAtomRegExpWithString(
 
   int matches = indices.length();
   if (matches == 0) {
-    pattern_regexp->ResetLastIndex();
+    JSRegExp::ResetLastIndex(isolate, pattern_regexp);
     return *subject;
   }
 
@@ -3014,7 +3015,7 @@ MUST_USE_RESULT static MaybeObject* StringReplaceRegExpWithString(
   int32_t* current_match = global_cache.FetchNext();
   if (current_match == NULL) {
     if (global_cache.HasException()) return Failure::Exception();
-    regexp->ResetLastIndex();
+    JSRegExp::ResetLastIndex(isolate, regexp);
     return *subject;
   }
 
@@ -3113,7 +3114,7 @@ MUST_USE_RESULT static MaybeObject* StringReplaceRegExpWithEmptyString(
   int32_t* current_match = global_cache.FetchNext();
   if (current_match == NULL) {
     if (global_cache.HasException()) return Failure::Exception();
-    regexp->ResetLastIndex();
+    JSRegExp::ResetLastIndex(isolate, regexp);
     return *subject;
   }
 

test/mjsunit/regress/regress-crbug-170856.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.
+
+r = new RegExp("a");
+for (var i = 0; i < 100; i++) {
+  r["abc" + i] = i;
+}
+"zzzz".replace(r, "");
+assertEquals(0, r.lastIndex);