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livetrax/libs/pbd/boost_debug.cc

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/*
Copyright (C) 2009 Paul Davis
From an idea by Carl Hetherington.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "libpbd-config.h"
#ifdef HAVE_EXECINFO
#include <execinfo.h>
#endif
#include <stdlib.h>
#include <iostream>
#include <map>
#include <set>
#include <vector>
#include <glibmm/threads.h>
#include <boost/shared_ptr.hpp>
#include "pbd/stacktrace.h"
#include "pbd/boost_debug.h"
class Backtrace {
public:
Backtrace ();
std::ostream& print (std::ostream& str) const;
private:
void* trace[200];
size_t size;
};
std::ostream& operator<< (std::ostream& str, const Backtrace& bt) { return bt.print (str); }
Backtrace::Backtrace()
{
#ifdef HAVE_EXECINFO
size = ::backtrace (trace, 200);
#endif
}
std::ostream&
Backtrace::print (std::ostream& str) const
{
char **strings = 0;
size_t i;
if (size) {
#ifdef HAVE_EXECINFO
strings = ::backtrace_symbols (trace, size);
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#endif
if (strings) {
for (i = 3; i < 5+18 && i < size; i++) {
str << strings[i] << std::endl;
}
free (strings);
}
}
return str;
}
struct BTPair {
Backtrace* ref;
Backtrace* rel;
BTPair (Backtrace* bt) : ref (bt), rel (0) {}
~BTPair () { }
};
std::ostream& operator<<(std::ostream& str, const BTPair& btp) {
str << "*********************************************\n";
if (btp.ref) str << *btp.ref << std::endl;
str << "Rel:\n";
if (btp.rel) str << *btp.rel << std::endl;
return str;
}
struct SPDebug {
Backtrace* constructor;
Backtrace* destructor;
SPDebug (Backtrace* c) : constructor (c), destructor (0) {}
~SPDebug () {
delete constructor;
delete destructor;
}
};
std::ostream& operator<< (std::ostream& str, const SPDebug& spd)
{
str << "Constructor :" << std::endl;
if (spd.constructor) {
str << *spd.constructor << std::endl;
}
return str;
}
typedef std::multimap<volatile void const*,SPDebug*> PointerMap;
typedef std::map<volatile void const*,const char*> IPointerMap;
using namespace std;
static PointerMap* _sptrs;
PointerMap& sptrs() {
if (_sptrs == 0) {
_sptrs = new PointerMap;
}
return *_sptrs;
}
static IPointerMap* _interesting_pointers;
IPointerMap& interesting_pointers() {
if (_interesting_pointers == 0) {
_interesting_pointers = new IPointerMap;
}
return *_interesting_pointers;
}
static Glib::Threads::Mutex* _the_lock;
static Glib::Threads::Mutex& the_lock() {
if (_the_lock == 0) {
_the_lock = new Glib::Threads::Mutex;
}
return *_the_lock;
}
static bool
is_interesting_object (volatile void const* ptr)
{
if (ptr == 0) {
return false;
}
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return interesting_pointers().find (ptr) != interesting_pointers().end();
}
/* ------------------------------- */
static bool debug_out = false;
void
boost_debug_shared_ptr_show_live_debugging (bool yn)
{
debug_out = yn;
}
void
boost_debug_shared_ptr_mark_interesting (void* ptr, const char* type)
{
Glib::Threads::Mutex::Lock guard (the_lock());
pair<void*,const char*> newpair (ptr, type);
interesting_pointers().insert (newpair);
if (debug_out) {
cerr << "Interesting object @ " << ptr << " of type " << type << endl;
}
}
void
boost_debug_shared_ptr_operator_equals (void const *sp, void const *old_obj, int old_use_count, void const *obj, int new_use_count)
{
if (old_obj == 0 && obj == 0) {
return;
}
Glib::Threads::Mutex::Lock guard (the_lock());
if (is_interesting_object (old_obj) || is_interesting_object (obj)) {
if (debug_out) {
cerr << "ASSIGN SWAPS " << old_obj << " & " << obj << endl;
}
}
if (is_interesting_object (old_obj)) {
if (debug_out) {
cerr << "\tlost old sp @ " << sp << " for " << old_obj << " UC = " << old_use_count << " now for " << obj << " UC = " << new_use_count
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<< " (total sp's = " << sptrs().size() << ')' << endl;
}
PointerMap::iterator x = sptrs().find (sp);
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if (x != sptrs().end()) {
sptrs().erase (x);
if (debug_out) {
cerr << "\tRemoved (by assignment) sp for " << old_obj << " @ " << sp << " UC = " << old_use_count << " (total sp's = " << sptrs().size() << ')' << endl;
}
}
}
if (is_interesting_object (obj)) {
pair<void const*, SPDebug*> newpair;
newpair.first = sp;
newpair.second = new SPDebug (new Backtrace());
sptrs().insert (newpair);
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if (debug_out) {
cerr << "assignment created sp for " << obj << " @ " << sp << " used to point to " << old_obj << " UC = " << old_use_count
<< " UC = " << new_use_count
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<< " (total sp's = " << sptrs().size() << ')' << endl;
cerr << *newpair.second << endl;
}
}
}
void
boost_debug_shared_ptr_reset (void const *sp, void const *old_obj, int old_use_count, void const *obj, int new_use_count)
{
if (old_obj == 0 && obj == 0) {
return;
}
Glib::Threads::Mutex::Lock guard (the_lock());
if (is_interesting_object (old_obj) || is_interesting_object (obj)) {
if (debug_out) {
cerr << "RESET SWAPS " << old_obj << " & " << obj << endl;
}
}
if (is_interesting_object (old_obj)) {
if (debug_out) {
cerr << "\tlost old sp @ " << sp << " for " << old_obj << " UC = " << old_use_count << " now for " << obj << " UC = " << new_use_count
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<< " (total sp's = " << sptrs().size() << ')' << endl;
}
PointerMap::iterator x = sptrs().find (sp);
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if (x != sptrs().end()) {
sptrs().erase (x);
if (debug_out) {
cerr << "\tRemoved (by reset) sp for " << old_obj << " @ " << sp << " UC = " << old_use_count << " (total sp's = " << sptrs().size() << ')' << endl;
}
}
}
if (is_interesting_object (obj)) {
pair<void const*, SPDebug*> newpair;
newpair.first = sp;
newpair.second = new SPDebug (new Backtrace());
sptrs().insert (newpair);
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if (debug_out) {
cerr << "reset created sp for " << obj << " @ " << sp << " used to point to " << old_obj << " UC = " << old_use_count
<< " UC = " << new_use_count
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<< " (total sp's = " << sptrs().size() << ')' << endl;
cerr << *newpair.second << endl;
}
}
}
void
boost_debug_shared_ptr_destructor (void const *sp, volatile void const *obj, int use_count)
{
Glib::Threads::Mutex::Lock guard (the_lock());
PointerMap::iterator x = sptrs().find (sp);
if (x != sptrs().end()) {
sptrs().erase (x);
if (debug_out) {
cerr << "Removed sp for " << obj << " @ " << sp << " UC = " << use_count << " (total sp's = " << sptrs().size() << ')' << endl;
}
}
}
void
boost_debug_shared_ptr_constructor (void const *sp, volatile void const *obj, int use_count)
{
if (is_interesting_object (obj)) {
Glib::Threads::Mutex::Lock guard (the_lock());
pair<void const*, SPDebug*> newpair;
newpair.first = sp;
newpair.second = new SPDebug (new Backtrace());
sptrs().insert (newpair);
if (debug_out) {
cerr << "Stored constructor for " << obj << " @ " << sp << " UC = " << use_count << " (total sp's = " << sptrs().size() << ')' << endl;
cerr << *newpair.second << endl;
}
}
}
void
boost_debug_count_ptrs ()
{
Glib::Threads::Mutex::Lock guard (the_lock());
// cerr << "Tracking " << interesting_pointers().size() << " interesting objects with " << sptrs().size () << " shared ptrs\n";
}
void
boost_debug_list_ptrs ()
{
Glib::Threads::Mutex::Lock guard (the_lock());
if (sptrs().empty()) {
cerr << "There are no dangling shared ptrs\n";
} else {
for (PointerMap::iterator x = sptrs().begin(); x != sptrs().end(); ++x) {
cerr << "Shared ptr @ " << x->first << " history: "
<< *x->second
<< endl;
}
}
}
namespace boost {
void sp_scalar_constructor_hook( void *, std::size_t, void *)
{
}
void sp_scalar_destructor_hook( void *, std::size_t, void *)
{
}
void sp_counter_ref_hook (void* /*pn*/, long /* use count */)
{
}
void sp_counter_release_hook (void* /*pn*/, long /*use_count*/)
{
}
void sp_array_constructor_hook(void *)
{
}
void sp_array_destructor_hook(void *)
{
}
void sp_scalar_constructor_hook(void *)
{
}
void sp_scalar_destructor_hook(void *)
{
}
}