OLD | NEW |
1 /* | 1 /* |
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved. | 2 * Copyright (C) 2008 Apple Inc. All Rights Reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
(...skipping 12 matching lines...) Expand all Loading... |
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
24 */ | 24 */ |
25 | 25 |
26 #ifndef WTF_StdLibExtras_h | 26 #ifndef WTF_StdLibExtras_h |
27 #define WTF_StdLibExtras_h | 27 #define WTF_StdLibExtras_h |
28 | 28 |
29 #include "base/numerics/safe_conversions.h" | 29 #include "base/numerics/safe_conversions.h" |
30 #include "wtf/Assertions.h" | 30 #include "wtf/Assertions.h" |
31 #include "wtf/CPU.h" | 31 #include "wtf/CPU.h" |
32 #include "wtf/LeakAnnotations.h" | 32 #include "wtf/LeakAnnotations.h" |
| 33 #include "wtf/TypeTraits.h" |
33 #include <cstddef> | 34 #include <cstddef> |
34 | 35 |
35 #if ENABLE(ASSERT) | 36 #if ENABLE(ASSERT) |
36 #include "wtf/Noncopyable.h" | 37 #include "wtf/Noncopyable.h" |
37 #include "wtf/Threading.h" | 38 #include "wtf/Threading.h" |
38 | 39 |
39 class WTF_EXPORT StaticLocalVerifier { | 40 class WTF_EXPORT StaticLocalVerifier { |
40 WTF_MAKE_NONCOPYABLE(StaticLocalVerifier); | 41 WTF_MAKE_NONCOPYABLE(StaticLocalVerifier); |
41 public: | 42 public: |
42 StaticLocalVerifier() | 43 StaticLocalVerifier() |
43 : m_safelyInitialized(WTF::isBeforeThreadCreated()) | 44 : m_safelyInitialized(WTF::isBeforeThreadCreated()) |
44 , m_thread(WTF::currentThread()) | 45 , m_thread(WTF::currentThread()) |
45 { | 46 { |
46 } | 47 } |
47 | 48 |
48 bool isNotRacy() | 49 bool isNotRacy() |
49 { | 50 { |
50 // Make sure that this 1) is safely initialized, 2) keeps being called | 51 // Make sure that this 1) is safely initialized, 2) keeps being called |
51 // on the same thread, or 3) is called within | 52 // on the same thread, or 3) is called within |
52 // AtomicallyInitializedStatic (i.e. with a lock held). | 53 // AtomicallyInitializedStatic (i.e. with a lock held). |
53 return m_safelyInitialized || m_thread == WTF::currentThread() || WTF::i
sAtomicallyInitializedStaticMutexLockHeld(); | 54 return m_safelyInitialized || m_thread == WTF::currentThread() || WTF::i
sAtomicallyInitializedStaticMutexLockHeld(); |
54 } | 55 } |
55 | 56 |
56 private: | 57 private: |
57 bool m_safelyInitialized; | 58 bool m_safelyInitialized; |
58 ThreadIdentifier m_thread; | 59 ThreadIdentifier m_thread; |
59 }; | 60 }; |
60 #endif | 61 #endif |
61 | 62 |
62 // A direct static local to a Blink garbage collected objects isn't allowed; | 63 namespace blink { |
63 // must be wrapped up with a persistent reference. | 64 template<typename T>class Persistent; |
64 #define STATIC_ASSERT_FOR_LOCAL_WITH_GARBAGE_COLLECTED_TYPE(Name, Type) \ | 65 }; |
65 using Name##NoConstType = std::remove_const<Type>::type; \ | |
66 using Name##NoPointerType = std::remove_pointer<Name##NoConstType>::type; \ | |
67 using Name##NoReferenceType = std::remove_reference<Name##NoPointerType>::ty
pe; \ | |
68 static_assert(!WTF::IsGarbageCollectedType<Name##NoReferenceType>::value ||
WTF::IsPersistentReferenceType<Name##NoReferenceType>::value, "Garbage collected
static local needs to be wrapped up with a persistent reference") | |
69 | 66 |
70 // Use DEFINE_STATIC_LOCAL() to declare and define a static local variable (stat
ic T;) | 67 template<typename T, bool = WTF::IsGarbageCollectedType<T>::value && !WTF::IsPer
sistentReferenceType<T>::value> |
71 // so that it is leaked and its destructors are not called at exit. | 68 class StaticLocalWrapper { |
| 69 public: |
| 70 using WrapType = T; |
| 71 |
| 72 static T& unwrap(T* singleton) |
| 73 { |
| 74 return *singleton; |
| 75 } |
| 76 }; |
| 77 |
| 78 template<typename T> |
| 79 class StaticLocalWrapper<T, true> { |
| 80 public: |
| 81 using WrapType = blink::Persistent<T>; |
| 82 |
| 83 static T& unwrap(blink::Persistent<T>* singleton) |
| 84 { |
| 85 ASSERT(singleton); |
| 86 // If this assert triggers, you're supplying an empty ("()") 'Arguments'
argument |
| 87 // to DEFINE_STATIC_LOCAL() - it must be the heap object you wish to cre
ate |
| 88 // as a static singleton and wrapped up with a Persistent reference. |
| 89 ASSERT(*singleton); |
| 90 return **singleton; |
| 91 } |
| 92 }; |
| 93 |
| 94 #if ENABLE(ASSERT) |
| 95 #define DEFINE_STATIC_LOCAL_CHECK_THREADSAFE_ACCESS(Name) \ |
| 96 static StaticLocalVerifier Name##StaticLocalVerifier; \ |
| 97 ASSERT(Name##StaticLocalVerifier.isNotRacy()) |
| 98 #else |
| 99 #define DEFINE_STATIC_LOCAL_CHECK_THREADSAFE_ACCESS(Name) |
| 100 #endif |
| 101 |
| 102 // Use DEFINE_STATIC_LOCAL() to declare and define a static local variable |
| 103 // (static T;) so that it is leaked and its destructors are not called at exit. |
| 104 // T may also be a Blink garbage collected object, in which case it is |
| 105 // wrapped up by an off-heap Persistent<T> reference to the object, keeping |
| 106 // it alive across GCs. |
72 // | 107 // |
73 // To cooperate with leak detection, the objects held onto by these local static
s | 108 // To cooperate with leak detection(LSan) for Blink garbage collected objects, |
74 // will in some cases have to be finalized prior to leak checking. This only app
lies | 109 // the objects owned by persistent local statics will in some cases have to be |
75 // to static references to Oilpan heap objects and what they transitively hold o
n to. | 110 // finalized prior to leak checking. This only applies to static references to |
76 // LEAK_SANITIZER_REGISTER_STATIC_LOCAL() takes care of the details. | 111 // Blink heap objects and what they transitively hold on to. Hence the |
| 112 // LEAK_SANITIZER_REGISTER_STATIC_LOCAL() use, it taking care of the grungy |
| 113 // details. |
77 // | 114 // |
78 #if ENABLE(ASSERT) | 115 #define DEFINE_STATIC_LOCAL(Type, Name, Arguments) \ |
79 #define DEFINE_STATIC_LOCAL(Type, Name, Arguments) \ | 116 DEFINE_STATIC_LOCAL_CHECK_THREADSAFE_ACCESS(Name); \ |
80 STATIC_ASSERT_FOR_LOCAL_WITH_GARBAGE_COLLECTED_TYPE(Name, Type); \ | 117 using WrappedTypeFor##Name = StaticLocalWrapper<Type>::WrapType; \ |
81 static StaticLocalVerifier Name##StaticLocalVerifier; \ | 118 static Type& Name = StaticLocalWrapper<Type>::unwrap(LEAK_SANITIZER_REGISTER
_STATIC_LOCAL(WrappedTypeFor##Name, new WrappedTypeFor##Name Arguments)) |
82 ASSERT(Name##StaticLocalVerifier.isNotRacy()); \ | |
83 static Type& Name = *LEAK_SANITIZER_REGISTER_STATIC_LOCAL(Type, new Type Arg
uments) | |
84 #else | |
85 #define DEFINE_STATIC_LOCAL(Type, Name, Arguments) \ | |
86 STATIC_ASSERT_FOR_LOCAL_WITH_GARBAGE_COLLECTED_TYPE(Name, Type); \ | |
87 static Type& Name = *LEAK_SANITIZER_REGISTER_STATIC_LOCAL(Type, new Type Arg
uments) | |
88 #endif | |
89 | 119 |
90 // Use this to declare and define a static local pointer to a ref-counted object
so that | 120 // Use this to declare and define a static local pointer to a ref-counted object
so that |
91 // it is leaked so that the object's destructors are not called at exit. | 121 // it is leaked so that the object's destructors are not called at exit. |
92 // This macro should be used with ref-counted objects rather than DEFINE_STATIC_
LOCAL macro, | 122 // This macro should be used with ref-counted objects rather than DEFINE_STATIC_
LOCAL macro, |
93 // as this macro does not lead to an extra memory allocation. | 123 // as this macro does not lead to an extra memory allocation. |
94 #define DEFINE_STATIC_REF(type, name, arguments) \ | 124 #define DEFINE_STATIC_REF(type, name, arguments) \ |
95 static type* name = PassRefPtr<type>(arguments).leakRef(); | 125 static type* name = PassRefPtr<type>(arguments).leakRef(); |
96 | 126 |
97 /* | 127 /* |
98 * The reinterpret_cast<Type1*>([pointer to Type2]) expressions - where | 128 * The reinterpret_cast<Type1*>([pointer to Type2]) expressions - where |
(...skipping 102 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
201 inline void* operator new(size_t, NotNullTag, void* location) | 231 inline void* operator new(size_t, NotNullTag, void* location) |
202 { | 232 { |
203 ASSERT(location); | 233 ASSERT(location); |
204 return location; | 234 return location; |
205 } | 235 } |
206 | 236 |
207 using WTF::bitwise_cast; | 237 using WTF::bitwise_cast; |
208 using WTF::safeCast; | 238 using WTF::safeCast; |
209 | 239 |
210 #endif // WTF_StdLibExtras_h | 240 #endif // WTF_StdLibExtras_h |
OLD | NEW |