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Diffstat (limited to 'absl/debugging/leak_check.h')
| -rw-r--r-- | absl/debugging/leak_check.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/absl/debugging/leak_check.h b/absl/debugging/leak_check.h new file mode 100644 index 000000000000..f67fe88a0fec --- /dev/null +++ b/absl/debugging/leak_check.h @@ -0,0 +1,111 @@ +// +// Copyright 2017 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 +// +// http://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 package 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. +// +// See https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer +// +// ----------------------------------------------------------------------------- +#ifndef ABSL_DEBUGGING_LEAK_CHECK_H_ +#define ABSL_DEBUGGING_LEAK_CHECK_H_ + +#include <cstddef> + +namespace absl { + +// HaveLeakSanitizer() +// +// Returns true if a leak-checking sanitizer (either ASan or standalone LSan) is +// currently built into this target. +bool HaveLeakSanitizer(); + +// 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, the object must not get deallocated later. +// +template <typename T> +T* IgnoreLeak(T* ptr) { + DoIgnoreLeak(ptr); + return ptr; +} + +// 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); + +} // namespace absl + +#endif // ABSL_DEBUGGING_LEAK_CHECK_H_ |