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// 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 <gperftools/malloc_extension.h>
#include "base/abort.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.
delete new int;
// 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) tcmalloc::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;