[WIP] New GC related APIs.

test/cctest/test-mark-compact.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 25 matching lines @@
 #endif
 
 #include "v8.h"
 
 #include "global-handles.h"
 #include "snapshot.h"
 #include "cctest.h"
 
 using namespace v8::internal;
 
+using v8::UniqueId;
+
 
 TEST(MarkingDeque) {
   CcTest::InitializeVM();
   int mem_size = 20 * kPointerSize;
   byte* mem = NewArray<byte>(20*kPointerSize);
   Address low = reinterpret_cast<Address>(mem);
   Address high = low + mem_size;
   MarkingDeque s;
   s.Initialize(low, high);
 
@@ skipping 243 matching lines @@
 
 static int NumberOfWeakCalls = 0;
 static void WeakPointerCallback(v8::Isolate* isolate,
                                 v8::Persistent<v8::Value> handle,
                                 void* id) {
   ASSERT(id == reinterpret_cast<void*>(1234));
   NumberOfWeakCalls++;
   handle.Dispose(isolate);
 }
 
-TEST(ObjectGroups) {
+TEST(ObjectGroupsOldApi) {
   FLAG_incremental_marking = false;
   CcTest::InitializeVM();
   GlobalHandles* global_handles = Isolate::Current()->global_handles();
 
   NumberOfWeakCalls = 0;
   v8::HandleScope handle_scope(CcTest::isolate());
 
   Handle<Object> g1s1 =
       global_handles->Create(HEAP->AllocateFixedArray(1)->ToObjectChecked());
   Handle<Object> g1s2 =
@@ skipping 92 matching lines @@
                            &WeakPointerCallback);
   global_handles->MakeWeak(g2c1.location(),
                            reinterpret_cast<void*>(1234),
                            NULL,
                            &WeakPointerCallback);
 
   HEAP->CollectGarbage(OLD_POINTER_SPACE);
   CHECK_EQ(7, NumberOfWeakCalls);
 }
 
+TEST(ObjectGroups) {
+  FLAG_incremental_marking = false;
+  CcTest::InitializeVM();
+  GlobalHandles* global_handles = reinterpret_cast<v8::internal::Isolate*>(
+      CcTest::isolate())->global_handles();
+
+  NumberOfWeakCalls = 0;
+  v8::HandleScope handle_scope(CcTest::isolate());
+
+  Heap* heap = reinterpret_cast<v8::internal::Isolate*>(
+      CcTest::isolate())->heap();
+  Handle<Object> g1s1 =
+      global_handles->Create(heap->AllocateFixedArray(1)->ToObjectChecked());
+  Handle<Object> g1s2 =
+      global_handles->Create(heap->AllocateFixedArray(1)->ToObjectChecked());
+  Handle<Object> g1c1 =
+      global_handles->Create(heap->AllocateFixedArray(1)->ToObjectChecked());
+  global_handles->MakeWeak(g1s1.location(),
+                           reinterpret_cast<void*>(1234),
+                           NULL,
+                           &WeakPointerCallback);
+  global_handles->MakeWeak(g1s2.location(),
+                           reinterpret_cast<void*>(1234),
+                           NULL,
+                           &WeakPointerCallback);
+  global_handles->MakeWeak(g1c1.location(),
+                           reinterpret_cast<void*>(1234),
+                           NULL,
+                           &WeakPointerCallback);
+
+  Handle<Object> g2s1 =
+      global_handles->Create(heap->AllocateFixedArray(1)->ToObjectChecked());
+  Handle<Object> g2s2 =
+    global_handles->Create(heap->AllocateFixedArray(1)->ToObjectChecked());
+  Handle<Object> g2c1 =
+    global_handles->Create(heap->AllocateFixedArray(1)->ToObjectChecked());
+  global_handles->MakeWeak(g2s1.location(),
+                           reinterpret_cast<void*>(1234),
+                           NULL,
+                           &WeakPointerCallback);
+  global_handles->MakeWeak(g2s2.location(),
+                           reinterpret_cast<void*>(1234),
+                           NULL,
+                           &WeakPointerCallback);
+  global_handles->MakeWeak(g2c1.location(),
+                           reinterpret_cast<void*>(1234),
+                           NULL,
+                           &WeakPointerCallback);
+
+  Handle<Object> root = global_handles->Create(*g1s1);  // make a root.
+
+  // Connect group 1 and 2, make a cycle.
+  Handle<FixedArray>::cast(g1s2)->set(0, *g2s2);
+  Handle<FixedArray>::cast(g2s1)->set(0, *g1s1);
+
+  {
+    Object** g1_children[] = { g1c1.location() };
+    Object** g2_children[] = { g2c1.location() };
+    global_handles->SetObjectGroupId(g1s1.location(), v8::UniqueId(1));
+    global_handles->SetObjectGroupId(g1s2.location(), v8::UniqueId(1));
+    global_handles->AddImplicitReferences(
+        Handle<HeapObject>::cast(g1s1).location(), g1_children, 1);
+    global_handles->SetObjectGroupId(g2s1.location(), v8::UniqueId(2));
+    global_handles->SetObjectGroupId(g2s2.location(), v8::UniqueId(2));
+    global_handles->AddImplicitReferences(
+        Handle<HeapObject>::cast(g2s2).location(), g2_children, 1);
+  }
+  // Do a full GC
+  heap->CollectGarbage(OLD_POINTER_SPACE);
+
+  // All object should be alive.
+  CHECK_EQ(0, NumberOfWeakCalls);
+
+  // Weaken the root.
+  global_handles->MakeWeak(root.location(),
+                           reinterpret_cast<void*>(1234),
+                           NULL,
+                           &WeakPointerCallback);
+  // But make children strong roots---all the objects (except for children)
+  // should be collectable now.
+  global_handles->ClearWeakness(g1c1.location());
+  global_handles->ClearWeakness(g2c1.location());
+
+  // Groups are deleted, rebuild groups.
+  {
+    Object** g1_children[] = { g1c1.location() };
+    Object** g2_children[] = { g2c1.location() };
+    global_handles->SetObjectGroupId(g1s1.location(), v8::UniqueId(1));
+    global_handles->SetObjectGroupId(g1s2.location(), v8::UniqueId(1));
+    global_handles->AddImplicitReferences(
+        Handle<HeapObject>::cast(g1s1).location(), g1_children, 1);
+    global_handles->SetObjectGroupId(g2s1.location(), v8::UniqueId(2));
+    global_handles->SetObjectGroupId(g2s2.location(), v8::UniqueId(2));
+    global_handles->AddImplicitReferences(
+        Handle<HeapObject>::cast(g2s2).location(), g2_children, 1);
+  }
+
+  heap->CollectGarbage(OLD_POINTER_SPACE);
+
+  // All objects should be gone. 5 global handles in total.
+  CHECK_EQ(5, NumberOfWeakCalls);
+
+  // And now make children weak again and collect them.
+  global_handles->MakeWeak(g1c1.location(),
+                           reinterpret_cast<void*>(1234),
+                           NULL,
+                           &WeakPointerCallback);
+  global_handles->MakeWeak(g2c1.location(),
+                           reinterpret_cast<void*>(1234),
+                           NULL,
+                           &WeakPointerCallback);
+
+  heap->CollectGarbage(OLD_POINTER_SPACE);
+  CHECK_EQ(7, NumberOfWeakCalls);
+}
+
 
 class TestRetainedObjectInfo : public v8::RetainedObjectInfo {
  public:
   TestRetainedObjectInfo() : has_been_disposed_(false) {}
 
   bool has_been_disposed() { return has_been_disposed_; }
 
   virtual void Dispose() {
     ASSERT(!has_been_disposed_);
     has_been_disposed_ = true;
   }
 
   virtual bool IsEquivalent(v8::RetainedObjectInfo* other) {
     return other == this;
   }
 
   virtual intptr_t GetHash() { return 0; }
 
   virtual const char* GetLabel() { return "whatever"; }
 
  private:
   bool has_been_disposed_;
 };
 
 
-TEST(EmptyObjectGroups) {
+TEST(EmptyObjectGroupsOldApi) {
   CcTest::InitializeVM();
   GlobalHandles* global_handles = Isolate::Current()->global_handles();
 
   v8::HandleScope handle_scope(CcTest::isolate());
 
   Handle<Object> object =
       global_handles->Create(HEAP->AllocateFixedArray(1)->ToObjectChecked());
 
   TestRetainedObjectInfo info;
   global_handles->AddObjectGroup(NULL, 0, &info);
@@ skipping 100 matching lines @@
       if (v8::internal::Snapshot::IsEnabled()) {
         CHECK_LE(delta, 2900 * 1024);
       } else {
         CHECK_LE(delta, 3400 * 1024);
       }
     }
   }
 }
 
 #endif  // __linux__ and !USE_SIMULATOR