Fix handling of -0.0 in IsInt32/IsUInt32

test/cctest/test-api.cc

-// Copyright 2011 the V8 project authors. All rights reserved.
+// 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.
@@ skipping 2848 matching lines @@
   // Fraction.
   CompileRun("var obj = 42.3;");
   obj = env->Global()->Get(v8_str("obj"));
   CHECK(!obj->IsInt32());
   CHECK(!obj->IsUint32());
   // Large negative fraction.
   CompileRun("var obj = -5726623061.75;");
   obj = env->Global()->Get(v8_str("obj"));
   CHECK(!obj->IsInt32());
   CHECK(!obj->IsUint32());
+  // Positive zero
+  CompileRun("var obj = 0.0;");
+  obj = env->Global()->Get(v8_str("obj"));
+  CHECK(obj->IsInt32());
+  CHECK(obj->IsUint32());
+  // Positive zero
+  CompileRun("var obj = -0.0;");
+  obj = env->Global()->Get(v8_str("obj"));
+  CHECK(!obj->IsInt32());
+  CHECK(!obj->IsUint32());
 }
 
 
 THREADED_TEST(ConversionException) {
   v8::HandleScope scope;
   LocalContext env;
   CompileRun(
     "function TestClass() { };"
     "TestClass.prototype.toString = function () { throw 'uncle?'; };"
     "var obj = new TestClass();");
@@ skipping 12934 matching lines @@
   CompileRun("throw 'exception';");
 }
 
 
 TEST(CallCompletedCallbackTwoExceptions) {
   v8::HandleScope scope;
   LocalContext env;
   v8::V8::AddCallCompletedCallback(CallCompletedCallbackException);
   CompileRun("throw 'first exception';");
 }