| // -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- |
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| // --- |
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| // |
| // Author: Maxim Lifantsev |
| // |
| // A file to ensure that components of heap leak checker run before |
| // all global object constructors and after all global object |
| // destructors. |
| // |
| // This file must be the last library any binary links against. |
| // Otherwise, the heap checker may not be able to run early enough to |
| // catalog all the global objects in your program. If this happens, |
| // and later in the program you allocate memory and have one of these |
| // "uncataloged" global objects point to it, the heap checker will |
| // consider that allocation to be a leak, even though it's not (since |
| // the allocated object is reachable from global data and hence "live"). |
| |
| #include <stdlib.h> // for abort() |
| #include <gperftools/malloc_extension.h> |
| |
| // A dummy variable to refer from heap-checker.cc. This is to make |
| // sure this file is not optimized out by the linker. |
| bool heap_leak_checker_bcad_variable; |
| |
| extern void HeapLeakChecker_AfterDestructors(); // in heap-checker.cc |
| |
| // A helper class to ensure that some components of heap leak checking |
| // can happen before construction and after destruction |
| // of all global/static objects. |
| class HeapLeakCheckerGlobalPrePost { |
| public: |
| HeapLeakCheckerGlobalPrePost() { |
| if (count_ == 0) { |
| // The 'new int' will ensure that we have run an initial malloc |
| // hook, which will set up the heap checker via |
| // MallocHook_InitAtFirstAllocation_HeapLeakChecker. See malloc_hook.cc. |
| // This is done in this roundabout fashion in order to avoid self-deadlock |
| // if we directly called HeapLeakChecker_BeforeConstructors here. |
| // |
| // We use explicit global operator new/delete functions since |
| // plain 'naked' delete new int modern compilers optimize out to |
| // nothing. And apparently calling those global new/delete |
| // functions is assumed by compilers to be 'for effect' as well. |
| (operator delete)((operator new)(4)); |
| // This needs to be called before the first allocation of an STL |
| // object, but after libc is done setting up threads (because it |
| // calls setenv, which requires a thread-aware errno). By |
| // putting it here, we hope it's the first bit of code executed |
| // after the libc global-constructor code. |
| MallocExtension::Initialize(); |
| } |
| ++count_; |
| } |
| ~HeapLeakCheckerGlobalPrePost() { |
| if (count_ <= 0) abort(); |
| --count_; |
| if (count_ == 0) HeapLeakChecker_AfterDestructors(); |
| } |
| private: |
| // Counter of constructions/destructions of objects of this class |
| // (just in case there are more than one of them). |
| static int count_; |
| }; |
| |
| int HeapLeakCheckerGlobalPrePost::count_ = 0; |
| |
| // The early-construction/late-destruction global object. |
| static const HeapLeakCheckerGlobalPrePost heap_leak_checker_global_pre_post; |