Fix bug in compare IC. BUG=2291

Review URL: https://chromiumcodereview.appspot.com/10830334

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12313 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/code-stubs.cc

@@ -172,6 +172,8 @@ void ICCompareStub::AddToSpecialCache(Handle<Code> new_object) {
   Isolate* isolate = new_object->GetIsolate();
   Factory* factory = isolate->factory();
   return Map::UpdateCodeCache(known_map_,
+                              strict() ?
+                                  factory->strict_compare_ic_symbol() :
                                   factory->compare_ic_symbol(),
                               new_object);
 }
@@ -183,10 +185,16 @@ bool ICCompareStub::FindCodeInSpecialCache(Code** code_out) {
   Code::Flags flags = Code::ComputeFlags(
       static_cast<Code::Kind>(GetCodeKind()),
       UNINITIALIZED);
+  ASSERT(op_ == Token::EQ || op_ == Token::EQ_STRICT);
   Handle<Object> probe(
-      known_map_->FindInCodeCache(*factory->compare_ic_symbol(), flags));
+      known_map_->FindInCodeCache(
+        strict() ?
+            *factory->strict_compare_ic_symbol() :
+            *factory->compare_ic_symbol(),
+        flags));
   if (probe->IsCode()) {
     *code_out = Code::cast(*probe);
+    ASSERT(op_ == (*code_out)->compare_operation() + Token::EQ);
     return true;
   }
   return false;

src/heap.h

@@ -240,7 +240,8 @@ namespace internal {
   V(use_strict, "use strict")                                            \
   V(dot_symbol, ".")                                                     \
   V(anonymous_function_symbol, "(anonymous function)")                   \
-  V(compare_ic_symbol, ".compare_ic")                                    \
+  V(compare_ic_symbol, "==")                                             \
+  V(strict_compare_ic_symbol, "===")                                     \
   V(infinity_symbol, "Infinity")                                         \
   V(minus_infinity_symbol, "-Infinity")                                  \
   V(hidden_stack_trace_symbol, "v8::hidden_stack_trace")                 \

test/mjsunit/regress/regress-2291.js

@@ -0,0 +1,36 @@
+// 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.
+
+function StrictCompare(x) { return x === Object(x); }
+
+var obj = new Object();
+var obj2 = new Object();
+obj == obj;  // Populate IC cache with non-strict comparison.
+
+StrictCompare(obj);  // Set IC in StrictCompare from IC cache.
+
+assertFalse(StrictCompare('foo'));  // Use == stub for === operation.