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report_unreachable_objects() added to sp_debug_hooks.cpp

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[SVN r16780]
This commit is contained in:
Peter Dimov
2003-01-07 15:34:56 +00:00
parent 3e616752c9
commit e3f2329c14
2 changed files with 213 additions and 16 deletions
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72
include/boost/detail/shared_count.hpp
View File

@@ -30,6 +30,7 @@
#include <exception> // for std::exception
#include <new> // for std::bad_alloc
#include <typeinfo> // for std::type_info in get_deleter
#include <cstddef> // for std::size_t
#ifdef __BORLANDC__
# pragma warn -8026 // Functions with excep. spec. are not expanded inline
@@ -43,10 +44,10 @@ namespace boost
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
void sp_scalar_constructor_hook(void * p);
void sp_array_constructor_hook(void * p);
void sp_scalar_destructor_hook(void * p);
void sp_array_destructor_hook(void * p);
void sp_scalar_constructor_hook(void * px, std::size_t size, void * pn);
void sp_array_constructor_hook(void * px);
void sp_scalar_destructor_hook(void * px, std::size_t size, void * pn);
void sp_array_destructor_hook(void * px);
#endif
@@ -188,31 +189,31 @@ private:
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
template<class T> void cbi_call_constructor_hook(T * p, checked_deleter<T> const &, int)
template<class T> void cbi_call_constructor_hook(counted_base * pn, T * px, checked_deleter<T> const &, int)
{
boost::sp_scalar_constructor_hook(p);
boost::sp_scalar_constructor_hook(px, sizeof(T), pn);
}
template<class T> void cbi_call_constructor_hook(T * p, checked_array_deleter<T> const &, int)
template<class T> void cbi_call_constructor_hook(counted_base *, T * px, checked_array_deleter<T> const &, int)
{
boost::sp_array_constructor_hook(p);
boost::sp_array_constructor_hook(px);
}
template<class P, class D> void cbi_call_constructor_hook(P const &, D const &, long)
template<class P, class D> void cbi_call_constructor_hook(counted_base *, P const &, D const &, long)
{
}
template<class T> void cbi_call_destructor_hook(T * p, checked_deleter<T> const &, int)
template<class T> void cbi_call_destructor_hook(counted_base * pn, T * px, checked_deleter<T> const &, int)
{
boost::sp_scalar_destructor_hook(p);
boost::sp_scalar_destructor_hook(px, sizeof(T), pn);
}
template<class T> void cbi_call_destructor_hook(T * p, checked_array_deleter<T> const &, int)
template<class T> void cbi_call_destructor_hook(counted_base *, T * px, checked_array_deleter<T> const &, int)
{
boost::sp_array_destructor_hook(p);
boost::sp_array_destructor_hook(px);
}
template<class P, class D> void cbi_call_destructor_hook(P const &, D const &, long)
template<class P, class D> void cbi_call_destructor_hook(counted_base *, P const &, D const &, long)
{
}
@@ -244,14 +245,14 @@ public:
counted_base_impl(P p, D d): ptr(p), del(d)
{
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
detail::cbi_call_constructor_hook(p, d, 0);
detail::cbi_call_constructor_hook(this, p, d, 0);
#endif
}
virtual void dispose() // nothrow
{
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
detail::cbi_call_destructor_hook(ptr, del, 0);
detail::cbi_call_destructor_hook(this, ptr, del, 0);
#endif
del(ptr);
}
@@ -276,6 +277,13 @@ public:
#endif
};
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
int const shared_count_id = 0x2C35F101;
int const weak_count_id = 0x298C38A4;
#endif
class weak_count;
class shared_count
@@ -284,15 +292,25 @@ private:
counted_base * pi_;
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
int id_;
#endif
friend class weak_count;
public:
shared_count(): pi_(0) // nothrow
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
, id_(shared_count_id)
#endif
{
}
template<class P, class D> shared_count(P p, D d): pi_(0)
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
, id_(shared_count_id)
#endif
{
#ifndef BOOST_NO_EXCEPTIONS
@@ -325,6 +343,9 @@ public:
template<class Y>
explicit shared_count(std::auto_ptr<Y> & r): pi_(new counted_base_impl< Y *, checked_deleter<Y> >(r.get(), checked_deleter<Y>()))
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
, id_(shared_count_id)
#endif
{
r.release();
}
@@ -337,6 +358,9 @@ public:
}
shared_count(shared_count const & r): pi_(r.pi_) // nothrow
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
, id_(shared_count_id)
#endif
{
if(pi_ != 0) pi_->add_ref();
}
@@ -397,20 +421,33 @@ private:
counted_base * pi_;
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
int id_;
#endif
friend class shared_count;
public:
weak_count(): pi_(0) // nothrow
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
, id_(weak_count_id)
#endif
{
}
weak_count(shared_count const & r): pi_(r.pi_) // nothrow
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
, id_(shared_count_id)
#endif
{
if(pi_ != 0) pi_->weak_add_ref();
}
weak_count(weak_count const & r): pi_(r.pi_) // nothrow
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
, id_(shared_count_id)
#endif
{
if(pi_ != 0) pi_->weak_add_ref();
}
@@ -464,6 +501,9 @@ public:
};
inline shared_count::shared_count(weak_count const & r): pi_(r.pi_)
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
, id_(shared_count_id)
#endif
{
if(pi_ != 0)
{

157
sp_debug_hooks.cpp
View File

@@ -14,11 +14,17 @@
#if defined(BOOST_ENABLE_SP_DEBUG_HOOKS)
#include <boost/assert.hpp>
#include <boost/detail/shared_count.hpp>
#include <boost/detail/lightweight_mutex.hpp>
#include <new>
#include <cstdlib>
#include <map>
#include <iostream>
int const m = 2; // m * sizeof(int) must be aligned appropriately
// magic values to mark heap blocks with
int const allocated_scalar = 0x1234560C;
int const allocated_array = 0x1234560A;
int const adopted_scalar = 0x0567890C;
@@ -27,6 +33,8 @@ int const deleted = 0x498769DE;
using namespace std; // for compilers where things aren't in std
// operator new
static new_handler get_new_handler()
{
new_handler p = set_new_handler(0);
@@ -103,6 +111,139 @@ void * operator new[](size_t n, nothrow_t const &) throw()
#endif
// cycle detection
typedef std::map< void *, std::pair<void *, size_t> > map_type;
static map_type & get_map()
{
static map_type m;
return m;
}
typedef boost::detail::lightweight_mutex mutex_type;
static mutex_type & get_mutex()
{
static mutex_type m;
return m;
}
static void * init_mutex_before_main = &get_mutex();
namespace
{
class X;
struct count_layout
{
boost::detail::counted_base * pi;
int id;
};
struct shared_ptr_layout
{
X * px;
count_layout pn;
};
}
// assume 4 byte alignment for pointers when scanning
size_t const pointer_align = 4;
static void scan_and_count(void const * area, size_t size, map_type const & m, std::map<void const *, long> & m2)
{
unsigned char const * p = static_cast<unsigned char const *>(area);
for(size_t n = 0; n < size; p += pointer_align, n += pointer_align)
{
shared_ptr_layout const * q = reinterpret_cast<shared_ptr_layout const *>(p);
if(q->pn.id == boost::detail::shared_count_id && m.count(q->pn.pi) != 0)
{
++m2[q->pn.pi];
}
}
}
static bool scan_and_mark(void const * area, size_t size, map_type const & m, std::map<void const *, long> & m2)
{
bool updated = false;
unsigned char const * p = static_cast<unsigned char const *>(area);
for(size_t n = 0; n < size; p += pointer_align, n += pointer_align)
{
shared_ptr_layout const * q = reinterpret_cast<shared_ptr_layout const *>(p);
if(q->pn.id == boost::detail::shared_count_id && m.count(q->pn.pi) != 0)
{
// mark as reachable
if(m2[q->pn.pi] != 0)
{
updated = true;
m2[q->pn.pi] = 0;
}
}
}
return updated;
}
void report_unreachable_objects()
{
std::map<void const *, long> m2;
mutex_type::scoped_lock lock(get_mutex());
map_type & m = get_map();
// scan objects for shared_ptr members, compute internal counts
for(map_type::iterator i = m.begin(); i != m.end(); ++i)
{
boost::detail::counted_base const * p = static_cast<boost::detail::counted_base *>(i->first);
BOOST_ASSERT(p->use_count() != 0); // there should be no inactive counts in the map
scan_and_count(i->second.first, i->second.second, m, m2);
}
// mark reachable objects
bool updated;
do
{
updated = false;
for(map_type::iterator i = m.begin(); i != m.end(); ++i)
{
boost::detail::counted_base const * p = static_cast<boost::detail::counted_base *>(i->first);
if(p->use_count() != m2[p] && scan_and_mark(i->second.first, i->second.second, m, m2))
{
updated = true;
}
}
} while(updated);
// report unreachable objects
for(map_type::iterator i = m.begin(); i != m.end(); ++i)
{
boost::detail::counted_base const * p = static_cast<boost::detail::counted_base *>(i->first);
if(p->use_count() == m2[p])
{
std::cerr << "Unreachable object at " << i->second.first << ", " << i->second.second << " bytes long.\n";
}
}
}
// debug hooks
namespace boost
{
@@ -120,6 +261,13 @@ void sp_scalar_constructor_hook(void * p)
*pm = adopted_scalar;
}
void sp_scalar_constructor_hook(void * px, std::size_t size, void * pn)
{
sp_scalar_constructor_hook(px);
mutex_type::scoped_lock lock(get_mutex());
get_map()[pn] = std::make_pair(px, size);
}
void sp_scalar_destructor_hook(void * p)
{
if(p == 0) return;
@@ -132,6 +280,13 @@ void sp_scalar_destructor_hook(void * p)
*pm = allocated_scalar;
}
void sp_scalar_destructor_hook(void * px, std::size_t /*size*/, void * pn)
{
sp_scalar_destructor_hook(px);
mutex_type::scoped_lock lock(get_mutex());
get_map().erase(pn);
}
// It is not possible to handle the array hooks in a portable manner.
// The implementation typically reserves a bit of storage for the number
// of objects in the array, and the argument of the array hook isn't
@@ -173,6 +328,8 @@ void sp_array_destructor_hook(void * /* p */)
} // namespace boost
// operator delete
void operator delete(void * p) throw()
{
if(p == 0) return;