Oilpan: Factor out GC-related enum definitions to BlinkGC.h

third_party/WebKit/Source/platform/heap/BlinkGC.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BlinkGC_h
+#define BlinkGC_h
+
+// BlinkGC.h is a file that defines common things used by Blink GC.
+
+#include "wtf/Allocator.h"
+
+namespace blink {
+
+class Visitor;
+
+#define PRINT_HEAP_STATS 0 // Enable this macro to print heap stats to stderr.
+
+using Address = uint8_t*;
+
+using FinalizationCallback = void (*)(void*);
+using VisitorCallback = void (*)(Visitor*, void* self);
+using TraceCallback = VisitorCallback;
+using WeakCallback = VisitorCallback;
+using EphemeronCallback = VisitorCallback;
+using PreFinalizerCallback = bool(*)(void*);
+
+// List of typed heaps. The list is used to generate the implementation
+// of typed heap related methods.
+//
+// To create a new typed heap add a H(<ClassName>) to the
+// FOR_EACH_TYPED_HEAP macro below.
+#define FOR_EACH_TYPED_HEAP(H)              \
+    H(Node)                                 \
+    H(CSSValue)
+
+#define TypedHeapEnumName(Type) Type##HeapIndex,
+
+class PLATFORM_EXPORT BlinkGC final {
+    STATIC_ONLY(BlinkGC);
+public:
+    // When garbage collecting we need to know whether or not there
+    // can be pointers to Blink GC managed objects on the stack for
+    // each thread. When threads reach a safe point they record
+    // whether or not they have pointers on the stack.
+    enum StackState {
+        NoHeapPointersOnStack,
+        HeapPointersOnStack
+    };
+
+    enum GCType {
+        // Both of the marking task and the sweeping task run in
+        // Heap::collectGarbage().
+        GCWithSweep,
+        // Only the marking task runs in Heap::collectGarbage().
+        // The sweeping task is split into chunks and scheduled lazily.
+        GCWithoutSweep,
+        // Only the marking task runs just to take a heap snapshot.
+        // The sweeping task doesn't run. The marks added in the marking task
+        // are just cleared.
+        TakeSnapshot,
+        // The marking task does not mark objects outside the heap of the GCing
+        // thread.
+        ThreadTerminationGC,
+    };
+
+    enum HeapIndices {
+        EagerSweepHeapIndex = 0,
+        NormalPage1HeapIndex,
+        NormalPage2HeapIndex,
+        NormalPage3HeapIndex,
+        NormalPage4HeapIndex,
+        Vector1HeapIndex,
+        Vector2HeapIndex,
+        Vector3HeapIndex,
+        Vector4HeapIndex,
+        InlineVectorHeapIndex,
+        HashTableHeapIndex,
+        FOR_EACH_TYPED_HEAP(TypedHeapEnumName)
+        LargeObjectHeapIndex,
+        // Values used for iteration of heap segments.
+        NumberOfHeaps,
+    };
+
+#if defined(ADDRESS_SANITIZER)
+    // Heaps can have their object payloads be poisoned, or cleared
+    // of their poisoning.
+    enum Poisoning {
+        SetPoison,
+        ClearPoison,
+    };
+
+    enum ObjectsToPoison {
+        UnmarkedOnly,
+        MarkedAndUnmarked,
+    };
+#endif
+
+    enum V8GCType {
+        V8MinorGC,
+        V8MajorGC,
+    };
+};
+
+} // namespace blink
+
+#endif