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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BlinkGC_h | 5 #ifndef BlinkGC_h |
6 #define BlinkGC_h | 6 #define BlinkGC_h |
7 | 7 |
8 // BlinkGC.h is a file that defines common things used by Blink GC. | 8 // BlinkGC.h is a file that defines common things used by Blink GC. |
9 | 9 |
10 #include "platform/PlatformExport.h" | 10 #include "platform/PlatformExport.h" |
11 #include "wtf/Allocator.h" | 11 #include "wtf/Allocator.h" |
12 | 12 |
13 namespace blink { | 13 namespace blink { |
14 | 14 |
15 class Visitor; | 15 class Visitor; |
16 | 16 |
17 #define PRINT_HEAP_STATS 0 // Enable this macro to print heap stats to stderr. | 17 #define PRINT_HEAP_STATS 0 // Enable this macro to print heap stats to stderr. |
18 | 18 |
19 using Address = uint8_t*; | 19 using Address = uint8_t*; |
20 | 20 |
21 using FinalizationCallback = void (*)(void*); | 21 using FinalizationCallback = void (*)(void*); |
22 using VisitorCallback = void (*)(Visitor*, void* self); | 22 using VisitorCallback = void (*)(Visitor*, void* self); |
23 using TraceCallback = VisitorCallback; | 23 using TraceCallback = VisitorCallback; |
24 using WeakCallback = VisitorCallback; | 24 using WeakCallback = VisitorCallback; |
25 using EphemeronCallback = VisitorCallback; | 25 using EphemeronCallback = VisitorCallback; |
26 using PreFinalizerCallback = bool (*)(void*); | 26 using PreFinalizerCallback = bool (*)(void*); |
27 | 27 |
| 28 // Simple alias to avoid heap compaction type signatures turning into |
| 29 // a sea of generic |void*|s. |
| 30 using MovableReference = void*; |
| 31 |
| 32 // Heap compaction supports registering callbacks that are to be invoked |
| 33 // when an object is moved during compaction. This is to support internal |
| 34 // location fixups that need to happen as a result. |
| 35 // |
| 36 // i.e., when the object residing at |from| is moved to |to| by the compaction |
| 37 // pass, invoke the callback to adjust any internal references that now need |
| 38 // to be |to|-relative. |
| 39 using MovingObjectCallback = void (*)(void* callbackData, |
| 40 MovableReference from, |
| 41 MovableReference to, |
| 42 size_t); |
| 43 |
28 // List of typed arenas. The list is used to generate the implementation | 44 // List of typed arenas. The list is used to generate the implementation |
29 // of typed arena related methods. | 45 // of typed arena related methods. |
30 // | 46 // |
31 // To create a new typed arena add a H(<ClassName>) to the | 47 // To create a new typed arena add a H(<ClassName>) to the |
32 // FOR_EACH_TYPED_ARENA macro below. | 48 // FOR_EACH_TYPED_ARENA macro below. |
33 #define FOR_EACH_TYPED_ARENA(H) \ | 49 #define FOR_EACH_TYPED_ARENA(H) \ |
34 H(Node) \ | 50 H(Node) \ |
35 H(CSSValue) | 51 H(CSSValue) |
36 | 52 |
37 #define TypedArenaEnumName(Type) Type##ArenaIndex, | 53 #define TypedArenaEnumName(Type) Type##ArenaIndex, |
38 | 54 |
39 class PLATFORM_EXPORT BlinkGC final { | 55 class PLATFORM_EXPORT BlinkGC final { |
40 STATIC_ONLY(BlinkGC); | 56 STATIC_ONLY(BlinkGC); |
41 | 57 |
42 public: | 58 public: |
43 // When garbage collecting we need to know whether or not there | 59 // When garbage collecting we need to know whether or not there |
44 // can be pointers to Blink GC managed objects on the stack for | 60 // can be pointers to Blink GC managed objects on the stack for |
45 // each thread. When threads reach a safe point they record | 61 // each thread. When threads reach a safe point they record |
46 // whether or not they have pointers on the stack. | 62 // whether or not they have pointers on the stack. |
47 enum StackState { NoHeapPointersOnStack, HeapPointersOnStack }; | 63 enum StackState { NoHeapPointersOnStack, HeapPointersOnStack }; |
48 | 64 |
49 enum GCType { | 65 enum GCType { |
50 // Both of the marking task and the sweeping task run in | 66 // Both of the marking task and the sweeping task run in |
51 // ThreadHeap::collectGarbage(). | 67 // ThreadHeap::collectGarbage(). |
52 GCWithSweep, | 68 GCWithSweep, |
53 // Only the marking task runs in ThreadHeap::collectGarbage(). | 69 // Only the marking task runs in ThreadHeap::collectGarbage(). |
54 // The sweeping task is split into chunks and scheduled lazily. | 70 // The sweeping task is split into chunks and scheduled lazily. |
55 GCWithoutSweep, | 71 GCWithoutSweep, |
| 72 // After the marking task has run in ThreadHeap::collectGarbage(), |
| 73 // sweep compaction of some heap arenas is performed. The sweeping |
| 74 // of the remaining arenas is split into chunks and scheduled lazily. |
| 75 GCWithSweepCompaction, |
56 // Only the marking task runs just to take a heap snapshot. | 76 // Only the marking task runs just to take a heap snapshot. |
57 // The sweeping task doesn't run. The marks added in the marking task | 77 // The sweeping task doesn't run. The marks added in the marking task |
58 // are just cleared. | 78 // are just cleared. |
59 TakeSnapshot, | 79 TakeSnapshot, |
60 // The marking task does not mark objects outside the heap of the GCing | 80 // The marking task does not mark objects outside the heap of the GCing |
61 // thread. | 81 // thread. |
62 ThreadTerminationGC, | 82 ThreadTerminationGC, |
63 // Just run thread-local weak processing. The weak processing may trace | 83 // Just run thread-local weak processing. The weak processing may trace |
64 // already marked objects but it must not trace any unmarked object. | 84 // already marked objects but it must not trace any unmarked object. |
65 // It's unfortunate that the thread-local weak processing requires | 85 // It's unfortunate that the thread-local weak processing requires |
66 // a marking visitor. See TODO in HashTable::process. | 86 // a marking visitor. See TODO in HashTable::process. |
67 ThreadLocalWeakProcessing, | 87 ThreadLocalWeakProcessing, |
68 }; | 88 }; |
69 | 89 |
70 enum GCReason { | 90 enum GCReason { |
71 IdleGC, | 91 IdleGC, |
72 PreciseGC, | 92 PreciseGC, |
73 ConservativeGC, | 93 ConservativeGC, |
74 ForcedGC, | 94 ForcedGC, |
75 MemoryPressureGC, | 95 MemoryPressureGC, |
76 PageNavigationGC, | 96 PageNavigationGC, |
77 NumberOfGCReason, | 97 NumberOfGCReason, |
78 }; | 98 }; |
79 | 99 |
80 enum HeapIndices { | 100 enum ArenaIndices { |
81 EagerSweepArenaIndex = 0, | 101 EagerSweepArenaIndex = 0, |
82 NormalPage1ArenaIndex, | 102 NormalPage1ArenaIndex, |
83 NormalPage2ArenaIndex, | 103 NormalPage2ArenaIndex, |
84 NormalPage3ArenaIndex, | 104 NormalPage3ArenaIndex, |
85 NormalPage4ArenaIndex, | 105 NormalPage4ArenaIndex, |
86 Vector1ArenaIndex, | 106 Vector1ArenaIndex, |
87 Vector2ArenaIndex, | 107 Vector2ArenaIndex, |
88 Vector3ArenaIndex, | 108 Vector3ArenaIndex, |
89 Vector4ArenaIndex, | 109 Vector4ArenaIndex, |
90 InlineVectorArenaIndex, | 110 InlineVectorArenaIndex, |
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101 | 121 |
102 enum ThreadHeapMode { | 122 enum ThreadHeapMode { |
103 MainThreadHeapMode, | 123 MainThreadHeapMode, |
104 PerThreadHeapMode, | 124 PerThreadHeapMode, |
105 }; | 125 }; |
106 }; | 126 }; |
107 | 127 |
108 } // namespace blink | 128 } // namespace blink |
109 | 129 |
110 #endif | 130 #endif |
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