/work/obj-fuzz/dist/include/js/RefCounted.h
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1 | | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
2 | | * vim: set ts=8 sts=4 et sw=4 tw=99: |
3 | | * This Source Code Form is subject to the terms of the Mozilla Public |
4 | | * License, v. 2.0. If a copy of the MPL was not distributed with this |
5 | | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
6 | | |
7 | | #ifndef js_RefCounted_h |
8 | | #define js_RefCounted_h |
9 | | |
10 | | #include "mozilla/Atomics.h" |
11 | | #include "mozilla/RefCountType.h" |
12 | | |
13 | | #include "js/Utility.h" |
14 | | |
15 | | // These types implement the same interface as mozilla::(Atomic)RefCounted and |
16 | | // must be used instead of mozilla::(Atomic)RefCounted for everything in |
17 | | // SpiderMonkey. There are two reasons: |
18 | | // - Release() needs to call js_delete, not delete |
19 | | // - SpiderMonkey does not have MOZILLA_INTERNAL_API defined which can lead |
20 | | // to ODR violations that show up as spurious leak reports when ref-counted |
21 | | // types are allocated by SpiderMonkey and released by Gecko (or vice versa). |
22 | | |
23 | | namespace js { |
24 | | |
25 | | template <typename T> |
26 | | class RefCounted |
27 | | { |
28 | | static const MozRefCountType DEAD = 0xffffdead; |
29 | | |
30 | | protected: |
31 | | RefCounted() : mRefCnt(0) {} |
32 | | ~RefCounted() { MOZ_ASSERT(mRefCnt == DEAD); } |
33 | | |
34 | | public: |
35 | | void AddRef() const |
36 | | { |
37 | | MOZ_ASSERT(int32_t(mRefCnt) >= 0); |
38 | | ++mRefCnt; |
39 | | } |
40 | | |
41 | | void Release() const |
42 | | { |
43 | | MOZ_ASSERT(int32_t(mRefCnt) > 0); |
44 | | MozRefCountType cnt = --mRefCnt; |
45 | | if (0 == cnt) { |
46 | | #ifdef DEBUG |
47 | | mRefCnt = DEAD; |
48 | | #endif |
49 | | js_delete(const_cast<T*>(static_cast<const T*>(this))); |
50 | | } |
51 | | } |
52 | | |
53 | | private: |
54 | | mutable MozRefCountType mRefCnt; |
55 | | }; |
56 | | |
57 | | template <typename T> |
58 | | class AtomicRefCounted |
59 | | { |
60 | | // On 64-bit systems, if the refcount type is small (say, 32 bits), there's |
61 | | // a risk that it could overflow. So require it to be large enough. |
62 | | |
63 | | static_assert(sizeof(MozRefCountType) == sizeof(uintptr_t), |
64 | | "You're at risk for ref count overflow."); |
65 | | |
66 | | static const MozRefCountType DEAD = ~MozRefCountType(0xffff) | 0xdead; |
67 | | |
68 | | protected: |
69 | 0 | AtomicRefCounted() : mRefCnt(0) {}Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Metadata>::AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::ElemSegment>::AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::ShareableBytes>::AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Code>::AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::CompileArgs>::AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::DataSegment>::AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<JS::WasmModule>::AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Table>::AtomicRefCounted() |
70 | 0 | ~AtomicRefCounted() { MOZ_ASSERT(mRefCnt == DEAD); }Unexecuted instantiation: js::AtomicRefCounted<js::wasm::ElemSegment>::~AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::ShareableBytes>::~AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::CompileArgs>::~AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Metadata>::~AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::DataSegment>::~AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Code>::~AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<JS::WasmModule>::~AtomicRefCounted() Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Table>::~AtomicRefCounted() |
71 | | |
72 | | public: |
73 | | void AddRef() const |
74 | 0 | { |
75 | 0 | ++mRefCnt; |
76 | 0 | MOZ_ASSERT(mRefCnt != DEAD); |
77 | 0 | } Unexecuted instantiation: js::AtomicRefCounted<JS::WasmModule>::AddRef() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Code>::AddRef() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::ShareableBytes>::AddRef() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Metadata>::AddRef() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::ElemSegment>::AddRef() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::CompileArgs>::AddRef() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::DataSegment>::AddRef() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Table>::AddRef() const |
78 | | |
79 | | void Release() const |
80 | 0 | { |
81 | 0 | MOZ_ASSERT(mRefCnt != 0); |
82 | 0 | MozRefCountType cnt = --mRefCnt; |
83 | 0 | if (0 == cnt) { |
84 | | #ifdef DEBUG |
85 | | mRefCnt = DEAD; |
86 | | #endif |
87 | | js_delete(const_cast<T*>(static_cast<const T*>(this))); |
88 | 0 | } |
89 | 0 | } Unexecuted instantiation: js::AtomicRefCounted<JS::WasmModule>::Release() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::ShareableBytes>::Release() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::ElemSegment>::Release() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::DataSegment>::Release() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Code>::Release() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Metadata>::Release() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::CompileArgs>::Release() const Unexecuted instantiation: js::AtomicRefCounted<js::wasm::Table>::Release() const |
90 | | |
91 | | private: |
92 | | mutable mozilla::Atomic<MozRefCountType> mRefCnt; |
93 | | }; |
94 | | |
95 | | } // namespace js |
96 | | |
97 | | #endif /* js_RefCounted_h */ |