Oilpan: support eager tracing of objects when marking.

Source/platform/heap/HeapTest.cpp

Index: Source/platform/heap/HeapTest.cpp
diff --git a/Source/platform/heap/HeapTest.cpp b/Source/platform/heap/HeapTest.cpp
index 4e4874366a33c326de9a370b1df5f5bd034af5c6..5c858e7a3c6212306c4b380ae7ea1733796c3a0b 100644
--- a/Source/platform/heap/HeapTest.cpp
+++ b/Source/platform/heap/HeapTest.cpp
@@ -233,7 +233,11 @@ static size_t objectPayloadSize()
         if (object)                                                        \
             m_count++;                                                     \
     }                                                                      \
-    virtual bool isMarked(const Type*) override { return false; }
+    virtual bool isMarked(const Type*) override { return false; }          \
+    virtual bool ensureMarked(const Type* objectPointer) override          \
+    {                                                                      \
+        return ensureMarked(objectPointer);                                \
+    }
 
 class CountingVisitor : public Visitor {
 public:
@@ -268,6 +272,13 @@ public:
 #endif
     virtual void registerWeakCell(void**, WeakPointerCallback) override { }
     virtual bool isMarked(const void*) override { return false; }
+    virtual bool ensureMarked(const void* objectPointer) override
+    {
+        if (!objectPointer || isMarked(objectPointer))
+            return false;
+        markNoTracing(objectPointer);
+        return true;
+    }
 
     FOR_EACH_TYPED_HEAP(DEFINE_VISITOR_METHODS)
 
@@ -278,6 +289,8 @@ private:
     size_t m_count;
 };
 
+#undef DEFINE_VISITOR_METHODS
+
 class SimpleObject : public GarbageCollected<SimpleObject> {
 public:
     static SimpleObject* create() { return new SimpleObject(); }
@@ -295,8 +308,6 @@ protected:
     char payload[64];
 };
 
-#undef DEFINE_VISITOR_METHODS
-
 class HeapTestSuperClass : public GarbageCollectedFinalized<HeapTestSuperClass> {
 public:
     static HeapTestSuperClass* create()
@@ -5233,4 +5244,52 @@ TEST(HeapTest, NonNodeAllocatingNodeInDestructor)
     NonNodeAllocatingNodeInDestructor::s_node = 0;
 }
 
+class TraceTypeEagerly1 : public GarbageCollected<TraceTypeEagerly1> { };
+WILL_BE_EAGERLY_TRACED(TraceTypeEagerly1);
+class TraceTypeEagerly2 : public TraceTypeEagerly1 { };
+
+class TraceTypeEagerly3 { };
+WILL_BE_EAGERLY_TRACED(TraceTypeEagerly3);
+
+class TraceTypeEagerly4 : public TraceTypeEagerly3 { };
+
+class TraceTypeEagerly5 { };
+WILL_BE_EAGERLY_TRACED_CLASS(TraceTypeEagerly5);
+
+class TraceTypeEagerly6 : public TraceTypeEagerly5 { };
+
+class TraceTypeEagerly7 { };
+
+class TraceTypeNonEagerly1 { };
+WILL_NOT_BE_EAGERLY_TRACED(TraceTypeNonEagerly1);
+
+TEST(HeapTest, TraceTypesEagerly)
+{
+    COMPILE_ASSERT(TraceEagerlyTrait<TraceTypeEagerly1>::value, ShouldBeTrue);
+    COMPILE_ASSERT(TraceEagerlyTrait<Member<TraceTypeEagerly1>>::value, ShouldBeTrue);
+    COMPILE_ASSERT(TraceEagerlyTrait<WeakMember<TraceTypeEagerly1>>::value, ShouldBeTrue);
+    COMPILE_ASSERT(!TraceEagerlyTrait<RawPtr<TraceTypeEagerly1>>::value, ShouldBeTrue);
+    COMPILE_ASSERT(TraceEagerlyTrait<HeapVector<Member<TraceTypeEagerly1>>>::value, ShouldBeTrue);
+    COMPILE_ASSERT(TraceEagerlyTrait<HeapVector<WeakMember<TraceTypeEagerly1>>>::value, ShouldBeTrue);
+    COMPILE_ASSERT(TraceEagerlyTrait<HeapHashSet<Member<TraceTypeEagerly1>>>::value, ShouldBeTrue);
+    COMPILE_ASSERT(TraceEagerlyTrait<HeapHashSet<Member<TraceTypeEagerly1>>>::value, ShouldBeTrue);
+    using HashMapIntToObj = HeapHashMap<int, Member<TraceTypeEagerly1>>;
+    COMPILE_ASSERT(TraceEagerlyTrait<HashMapIntToObj>::value, ShouldBeTrue);
+    using HashMapObjToInt = HeapHashMap<Member<TraceTypeEagerly1>, int>;
+    COMPILE_ASSERT(TraceEagerlyTrait<HashMapObjToInt>::value, ShouldBeTrue);
+
+    COMPILE_ASSERT(TraceEagerlyTrait<TraceTypeEagerly2>::value, ShouldBeTrue);
+    COMPILE_ASSERT(TraceEagerlyTrait<TraceTypeEagerly3>::value, ShouldBeTrue);
+
+    COMPILE_ASSERT(TraceEagerlyTrait<TraceTypeEagerly4>::value, ShouldBeTrue);
+
+    COMPILE_ASSERT(TraceEagerlyTrait<TraceTypeEagerly5>::value, ShouldBeTrue);
+    COMPILE_ASSERT(TraceEagerlyTrait<Member<TraceTypeEagerly5>>::value, ShouldBeTrue);
+
+    COMPILE_ASSERT(!TraceEagerlyTrait<TraceTypeEagerly6>::value, ShouldBeTrue);
+    COMPILE_ASSERT(!TraceEagerlyTrait<TraceTypeEagerly7>::value, ShouldBeTrue);
+
+    COMPILE_ASSERT(!TraceEagerlyTrait<TraceTypeNonEagerly1>::value, ShouldBeTrue);
+}
+
 } // namespace blink