1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: leak_check.h
// -----------------------------------------------------------------------------
//
// This file contains functions that affect leak checking behavior within
// targets built with the LeakSanitizer (LSan), a memory leak detector that is
// integrated within the AddressSanitizer (ASan) as an additional component, or
// which can be used standalone. LSan and ASan are included (or can be provided)
// as additional components for most compilers such as Clang, gcc and MSVC.
// Note: this leak checking API is not yet supported in MSVC.
// Leak checking is enabled by default in all ASan builds.
//
// https://clang.llvm.org/docs/LeakSanitizer.html
// https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer
//
// GCC and Clang both automatically enable LeakSanitizer when AddressSanitizer
// is enabled. To use the mode, simply pass `-fsanitize=address` to both the
// compiler and linker. An example Bazel command could be
//
// $ bazel test --copt=-fsanitize=address --linkopt=-fsanitize=address ...
//
// GCC and Clang auto support a standalone LeakSanitizer mode (a mode which does
// not also use AddressSanitizer). To use the mode, simply pass
// `-fsanitize=leak` to both the compiler and linker. Since GCC does not
// currently provide a way of detecting this mode at compile-time, GCC users
// must also pass -DLEAK_SANIITIZER to the compiler. An example Bazel command
// could be
//
// $ bazel test --copt=-DLEAK_SANITIZER --copt=-fsanitize=leak
// --linkopt=-fsanitize=leak ...
//
// -----------------------------------------------------------------------------
#ifndef Y_ABSL_DEBUGGING_LEAK_CHECK_H_
#define Y_ABSL_DEBUGGING_LEAK_CHECK_H_
#include <cstddef>
#include "y_absl/base/config.h"
namespace y_absl {
Y_ABSL_NAMESPACE_BEGIN
// HaveLeakSanitizer()
//
// Returns true if a leak-checking sanitizer (either ASan or standalone LSan) is
// currently built into this target.
bool HaveLeakSanitizer();
// LeakCheckerIsActive()
//
// Returns true if a leak-checking sanitizer (either ASan or standalone LSan) is
// currently built into this target and is turned on.
bool LeakCheckerIsActive();
// DoIgnoreLeak()
//
// Implements `IgnoreLeak()` below. This function should usually
// not be called directly; calling `IgnoreLeak()` is preferred.
void DoIgnoreLeak(const void* ptr);
// IgnoreLeak()
//
// Instruct the leak sanitizer to ignore leak warnings on the object referenced
// by the passed pointer, as well as all heap objects transitively referenced
// by it. The passed object pointer can point to either the beginning of the
// object or anywhere within it.
//
// Example:
//
// static T* obj = IgnoreLeak(new T(...));
//
// If the passed `ptr` does not point to an actively allocated object at the
// time `IgnoreLeak()` is called, the call is a no-op; if it is actively
// allocated, leak sanitizer will assume this object is referenced even if
// there is no actual reference in user memory.
//
template <typename T>
T* IgnoreLeak(T* ptr) {
DoIgnoreLeak(ptr);
return ptr;
}
// FindAndReportLeaks()
//
// If any leaks are detected, prints a leak report and returns true. This
// function may be called repeatedly, and does not affect end-of-process leak
// checking.
//
// Example:
// if (FindAndReportLeaks()) {
// ... diagnostic already printed. Exit with failure code.
// exit(1)
// }
bool FindAndReportLeaks();
// LeakCheckDisabler
//
// This helper class indicates that any heap allocations done in the code block
// covered by the scoped object, which should be allocated on the stack, will
// not be reported as leaks. Leak check disabling will occur within the code
// block and any nested function calls within the code block.
//
// Example:
//
// void Foo() {
// LeakCheckDisabler disabler;
// ... code that allocates objects whose leaks should be ignored ...
// }
//
// REQUIRES: Destructor runs in same thread as constructor
class LeakCheckDisabler {
public:
LeakCheckDisabler();
LeakCheckDisabler(const LeakCheckDisabler&) = delete;
LeakCheckDisabler& operator=(const LeakCheckDisabler&) = delete;
~LeakCheckDisabler();
};
// RegisterLivePointers()
//
// Registers `ptr[0,size-1]` as pointers to memory that is still actively being
// referenced and for which leak checking should be ignored. This function is
// useful if you store pointers in mapped memory, for memory ranges that we know
// are correct but for which normal analysis would flag as leaked code.
void RegisterLivePointers(const void* ptr, size_t size);
// UnRegisterLivePointers()
//
// Deregisters the pointers previously marked as active in
// `RegisterLivePointers()`, enabling leak checking of those pointers.
void UnRegisterLivePointers(const void* ptr, size_t size);
Y_ABSL_NAMESPACE_END
} // namespace y_absl
#endif // Y_ABSL_DEBUGGING_LEAK_CHECK_H_
|
