leak_check.h
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1 // Copyright 2018 The Abseil Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 //
15 // -----------------------------------------------------------------------------
16 // File: leak_check.h
17 // -----------------------------------------------------------------------------
18 //
19 // This file contains functions that affect leak checking behavior within
20 // targets built with the LeakSanitizer (LSan), a memory leak detector that is
21 // integrated within the AddressSanitizer (ASan) as an additional component, or
22 // which can be used standalone. LSan and ASan are included (or can be provided)
23 // as additional components for most compilers such as Clang, gcc and MSVC.
24 // Note: this leak checking API is not yet supported in MSVC.
25 // Leak checking is enabled by default in all ASan builds.
26 //
27 // See https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer
28 //
29 // -----------------------------------------------------------------------------
30 #ifndef ABSL_DEBUGGING_LEAK_CHECK_H_
31 #define ABSL_DEBUGGING_LEAK_CHECK_H_
32 
33 #include <cstddef>
34 
35 namespace absl {
36 
37 // HaveLeakSanitizer()
38 //
39 // Returns true if a leak-checking sanitizer (either ASan or standalone LSan) is
40 // currently built into this target.
41 bool HaveLeakSanitizer();
42 
43 // DoIgnoreLeak()
44 //
45 // Implements `IgnoreLeak()` below. This function should usually
46 // not be called directly; calling `IgnoreLeak()` is preferred.
47 void DoIgnoreLeak(const void* ptr);
48 
49 // IgnoreLeak()
50 //
51 // Instruct the leak sanitizer to ignore leak warnings on the object referenced
52 // by the passed pointer, as well as all heap objects transitively referenced
53 // by it. The passed object pointer can point to either the beginning of the
54 // object or anywhere within it.
55 //
56 // Example:
57 //
58 // static T* obj = IgnoreLeak(new T(...));
59 //
60 // If the passed `ptr` does not point to an actively allocated object at the
61 // time `IgnoreLeak()` is called, the call is a no-op; if it is actively
62 // allocated, the object must not get deallocated later.
63 //
64 template <typename T>
65 T* IgnoreLeak(T* ptr) {
66  DoIgnoreLeak(ptr);
67  return ptr;
68 }
69 
70 // LeakCheckDisabler
71 //
72 // This helper class indicates that any heap allocations done in the code block
73 // covered by the scoped object, which should be allocated on the stack, will
74 // not be reported as leaks. Leak check disabling will occur within the code
75 // block and any nested function calls within the code block.
76 //
77 // Example:
78 //
79 // void Foo() {
80 // LeakCheckDisabler disabler;
81 // ... code that allocates objects whose leaks should be ignored ...
82 // }
83 //
84 // REQUIRES: Destructor runs in same thread as constructor
86  public:
88  LeakCheckDisabler(const LeakCheckDisabler&) = delete;
91 };
92 
93 // RegisterLivePointers()
94 //
95 // Registers `ptr[0,size-1]` as pointers to memory that is still actively being
96 // referenced and for which leak checking should be ignored. This function is
97 // useful if you store pointers in mapped memory, for memory ranges that we know
98 // are correct but for which normal analysis would flag as leaked code.
99 void RegisterLivePointers(const void* ptr, size_t size);
100 
101 // UnRegisterLivePointers()
102 //
103 // Deregisters the pointers previously marked as active in
104 // `RegisterLivePointers()`, enabling leak checking of those pointers.
105 void UnRegisterLivePointers(const void* ptr, size_t size);
106 
107 } // namespace absl
108 
109 #endif // ABSL_DEBUGGING_LEAK_CHECK_H_
LeakCheckDisabler & operator=(const LeakCheckDisabler &)=delete
void UnRegisterLivePointers(const void *, size_t)
Definition: leak_check.cc:27
void DoIgnoreLeak(const void *)
Definition: leak_check.cc:25
Definition: algorithm.h:29
char * ptr
void RegisterLivePointers(const void *, size_t)
Definition: leak_check.cc:26
T * IgnoreLeak(T *ptr)
Definition: leak_check.h:65
uintptr_t size
bool HaveLeakSanitizer()
Definition: leak_check.cc:24


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autogenerated on Tue Jun 18 2019 19:44:36