Add filler at the new space top when forcing scavenge.

test/cctest/test-heap.cc

 // 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
@@ skipping 415 matching lines @@
     h1 = global_handles->Create(*i);
     h2 = global_handles->Create(*u);
   }
 
   std::pair<Handle<Object>*, int> handle_and_id(&h2, 1234);
   GlobalHandles::MakeWeak(h2.location(),
                           reinterpret_cast<void*>(&handle_and_id),
                           &TestWeakGlobalHandleCallback);
 
   // Scavenge treats weak pointers as normal roots.
-  heap->PerformScavenge();
+  heap->CollectGarbage(NEW_SPACE);
 
   CHECK((*h1)->IsString());
   CHECK((*h2)->IsHeapNumber());
 
   CHECK(!WeakPointerCleared);
   CHECK(!global_handles->IsNearDeath(h2.location()));
   CHECK(!global_handles->IsNearDeath(h1.location()));
 
   GlobalHandles::Destroy(h1.location());
   GlobalHandles::Destroy(h2.location());
@@ skipping 64 matching lines @@
     Handle<Object> i = factory->NewStringFromAscii(CStrVector("fisk"));
     h = global_handles->Create(*i);
   }
 
   std::pair<Handle<Object>*, int> handle_and_id(&h, 1234);
   GlobalHandles::MakeWeak(h.location(),
                           reinterpret_cast<void*>(&handle_and_id),
                           &TestWeakGlobalHandleCallback);
 
   // Scanvenge does not recognize weak reference.
-  heap->PerformScavenge();
+  heap->CollectGarbage(NEW_SPACE);
 
   CHECK(!WeakPointerCleared);
 
   // Mark-compact treats weak reference properly.
   heap->CollectGarbage(OLD_POINTER_SPACE);
 
   CHECK(WeakPointerCleared);
 }
 
 
@@ skipping 897 matching lines @@
     CompileRun("f4()");
     CHECK_EQ(opt ? 4 : 0, CountOptimizedUserFunctions(ctx[i]));
     CompileRun("f5()");
     CHECK_EQ(opt ? 5 : 0, CountOptimizedUserFunctions(ctx[i]));
 
     // Remove function f1, and
     CompileRun("f1=null");
 
     // Scavenge treats these references as strong.
     for (int j = 0; j < 10; j++) {
-      CcTest::heap()->PerformScavenge();
+      CcTest::heap()->CollectGarbage(NEW_SPACE);
       CHECK_EQ(opt ? 5 : 0, CountOptimizedUserFunctions(ctx[i]));
     }
 
     // Mark compact handles the weak references.
     isolate->compilation_cache()->Clear();
     heap->CollectAllGarbage(Heap::kNoGCFlags);
     CHECK_EQ(opt ? 4 : 0, CountOptimizedUserFunctions(ctx[i]));
 
     // Get rid of f3 and f5 in the same way.
     CompileRun("f3=null");
     for (int j = 0; j < 10; j++) {
-      CcTest::heap()->PerformScavenge();
+      CcTest::heap()->CollectGarbage(NEW_SPACE);
       CHECK_EQ(opt ? 4 : 0, CountOptimizedUserFunctions(ctx[i]));
     }
     CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
     CHECK_EQ(opt ? 3 : 0, CountOptimizedUserFunctions(ctx[i]));
     CompileRun("f5=null");
     for (int j = 0; j < 10; j++) {
-      CcTest::heap()->PerformScavenge();
+      CcTest::heap()->CollectGarbage(NEW_SPACE);
       CHECK_EQ(opt ? 3 : 0, CountOptimizedUserFunctions(ctx[i]));
     }
     CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
     CHECK_EQ(opt ? 2 : 0, CountOptimizedUserFunctions(ctx[i]));
 
     ctx[i]->Exit();
   }
 
   // Force compilation cache cleanup.
   CcTest::heap()->NotifyContextDisposed();
   CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
 
   // Dispose the native contexts one by one.
   for (int i = 0; i < kNumTestContexts; i++) {
     // TODO(dcarney): is there a better way to do this?
     i::Object** unsafe = reinterpret_cast<i::Object**>(*ctx[i]);
     *unsafe = CcTest::heap()->undefined_value();
     ctx[i].Clear();
 
     // Scavenge treats these references as strong.
     for (int j = 0; j < 10; j++) {
-      CcTest::heap()->PerformScavenge();
+      CcTest::heap()->CollectGarbage(i::NEW_SPACE);
       CHECK_EQ(kNumTestContexts - i, CountNativeContexts());
     }
 
     // Mark compact handles the weak references.
     CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
     CHECK_EQ(kNumTestContexts - i - 1, CountNativeContexts());
   }
 
   CHECK_EQ(0, CountNativeContexts());
 }
@@ skipping 2190 matching lines @@
     code = scope.CloseAndEscape(Handle<Code>(bar->code()));
   }
 
   // Now make sure that a gc should get rid of the function
   for (int i = 0; i < 4; i++) {
     heap->CollectAllGarbage(Heap::kAbortIncrementalMarkingMask);
   }
 
   ASSERT(code->marked_for_deoptimization());
 }