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1 // Copyright 2020 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef V8_HEAP_CPPGC_PREFINALIZER_HANDLER_H_
6 #define V8_HEAP_CPPGC_PREFINALIZER_HANDLER_H_
7 
8 #include <utility>
9 #include <vector>
10 
11 #include "include/cppgc/prefinalizer.h"
12 
13 namespace cppgc {
14 namespace internal {
15 
16 class HeapBase;
17 
18 struct PreFinalizer final {
19   using Callback = PrefinalizerRegistration::Callback;
20 
21   void* object;
22   Callback callback;
23 
24   bool operator==(const PreFinalizer& other) const;
25 };
26 
27 class PreFinalizerHandler final {
28  public:
29   explicit PreFinalizerHandler(HeapBase& heap);
30 
31   void RegisterPrefinalizer(PreFinalizer pre_finalizer);
32 
33   void InvokePreFinalizers();
34 
IsInvokingPreFinalizers()35   bool IsInvokingPreFinalizers() const { return is_invoking_; }
36 
37   void NotifyAllocationInPrefinalizer(size_t);
ExtractBytesAllocatedInPrefinalizers()38   size_t ExtractBytesAllocatedInPrefinalizers() {
39     return std::exchange(bytes_allocated_in_prefinalizers, 0);
40   }
41 
42  private:
43   // Checks that the current thread is the thread that created the heap.
44   bool CurrentThreadIsCreationThread();
45 
46   // Pre-finalizers are called in the reverse order in which they are
47   // registered by the constructors (including constructors of Mixin
48   // objects) for an object, by processing the ordered_pre_finalizers_
49   // back-to-front.
50   std::vector<PreFinalizer> ordered_pre_finalizers_;
51   std::vector<PreFinalizer>* current_ordered_pre_finalizers_;
52 
53   HeapBase& heap_;
54   bool is_invoking_ = false;
55 #ifdef DEBUG
56   int creation_thread_id_;
57 #endif
58 
59   // Counter of bytes allocated during prefinalizers.
60   size_t bytes_allocated_in_prefinalizers = 0u;
61 };
62 
63 }  // namespace internal
64 }  // namespace cppgc
65 
66 #endif  // V8_HEAP_CPPGC_PREFINALIZER_HANDLER_H_
67