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Diffstat (limited to 'trunk/src/heap-checker-bcad.cc')
| -rw-r--r-- | trunk/src/heap-checker-bcad.cc | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/trunk/src/heap-checker-bcad.cc b/trunk/src/heap-checker-bcad.cc new file mode 100644 index 0000000..87d3d87 --- /dev/null +++ b/trunk/src/heap-checker-bcad.cc @@ -0,0 +1,88 @@ +// Copyright (c) 2005, Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// --- +// All Rights Reserved. +// +// 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 <google/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_BeforeConstructors(); // in heap-checker.cc +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) { + HeapLeakChecker_BeforeConstructors(); + // 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; |