[heap] Introduce enum of garbage collection reasons.

test/cctest/test-dictionary.cc

 // Copyright 2011 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
@@ skipping 38 matching lines @@
 
   Handle<JSObject> a = factory->NewJSArray(7);
   Handle<JSObject> b = factory->NewJSArray(11);
   table = HashMap::Put(table, a, b);
   CHECK_EQ(table->NumberOfElements(), 1);
   CHECK_EQ(table->Lookup(a), *b);
   // When the key does not exist in the map, Lookup returns the hole.
   CHECK_EQ(table->Lookup(b), CcTest::heap()->the_hole_value());
 
   // Keys still have to be valid after objects were moved.
-  CcTest::heap()->CollectGarbage(NEW_SPACE);
+  CcTest::CollectGarbage(NEW_SPACE);
   CHECK_EQ(table->NumberOfElements(), 1);
   CHECK_EQ(table->Lookup(a), *b);
   CHECK_EQ(table->Lookup(b), CcTest::heap()->the_hole_value());
 
   // Keys that are overwritten should not change number of elements.
   table = HashMap::Put(table, a, factory->NewJSArray(13));
   CHECK_EQ(table->NumberOfElements(), 1);
   CHECK_NE(table->Lookup(a), *b);
 
   // Keys that have been removed are mapped to the hole.
@@ skipping 49 matching lines @@
   Factory* factory = isolate->factory();
 
   Handle<JSObject> a = factory->NewJSArray(7);
   Handle<JSObject> b = factory->NewJSArray(11);
   table = HashSet::Add(table, a);
   CHECK_EQ(table->NumberOfElements(), 1);
   CHECK(table->Has(isolate, a));
   CHECK(!table->Has(isolate, b));
 
   // Keys still have to be valid after objects were moved.
-  CcTest::heap()->CollectGarbage(NEW_SPACE);
+  CcTest::CollectGarbage(NEW_SPACE);
   CHECK_EQ(table->NumberOfElements(), 1);
   CHECK(table->Has(isolate, a));
   CHECK(!table->Has(isolate, b));
 
   // Keys that are overwritten should not change number of elements.
   table = HashSet::Add(table, a);
   CHECK_EQ(table->NumberOfElements(), 1);
   CHECK(table->Has(isolate, a));
   CHECK(!table->Has(isolate, b));
 
@@ skipping 164 matching lines @@
   dict->SetRequiresCopyOnCapacityChange();
   Handle<Name> key = isolate->factory()->InternalizeString(
       v8::Utils::OpenHandle(*v8_str("key")));
   Handle<Object> value = handle(Smi::FromInt(0), isolate);
   Handle<NameDictionary> new_dict =
       NameDictionary::Add(dict, key, value, PropertyDetails::Empty());
   CHECK_NE(*dict, *new_dict);
 }
 
 }  // namespace