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/*
Copyright (C) 2005-2009 Michel de Boer <michel@twinklephone.com>
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, see <https://www.gnu.org/licenses/>.
*/
#include "memman.h"
#include "log.h"
#include "util.h"
//////////////////////
// class t_ptr_info
//////////////////////
t_ptr_info::t_ptr_info(const string &_filename, int _lineno, bool _is_array) :
filename(_filename)
{
lineno = _lineno;
is_array = _is_array;
}
//////////////////////
// class t_memman
//////////////////////
t_memman::t_memman() {
num_new = 0;
num_new_duplicate = 0;
num_delete = 0;
num_delete_mismatch = 0;
num_array_mixing = 0;
}
void t_memman::trc_new(void *p, const string &filename, int lineno,
bool is_array)
{
mtx_memman.lock();
num_new++;
// Check if pointer already exists
map<void *, t_ptr_info>::iterator i;
i = pointer_map.find(p);
if (i != pointer_map.end()) {
// Most likely this is an error in the usage of the
// MEMMAN_NEW. A wrong pointer has been passed.
num_new_duplicate++;
// Unlock now. If memman gets called again via the log,
// there will be no dead lock.
mtx_memman.unlock();
log_file->write_header("t_memman::trc_new",
LOG_MEMORY, LOG_WARNING);
log_file->write_raw(filename);
log_file->write_raw(", line ");
log_file->write_raw(lineno);
log_file->write_raw(": pointer to ");
log_file->write_raw(ptr2str(p));
log_file->write_raw(" has already been allocated.\n");
log_file->write_raw("It was allocated here: ");
log_file->write_raw(i->second.filename);
log_file->write_raw(", line ");
log_file->write_raw(i->second.lineno);
log_file->write_endl();
log_file->write_footer();
return;
}
t_ptr_info pinfo(filename, lineno, is_array);
pointer_map[p] = pinfo;
mtx_memman.unlock();
}
void t_memman::trc_delete(void *p, const string &filename, int lineno,
bool is_array)
{
mtx_memman.lock();
num_delete++;
map<void *, t_ptr_info>::iterator i;
i = pointer_map.find(p);
// Check if the pointer allocation has been reported
if (i == pointer_map.end()) {
num_delete_mismatch++;
mtx_memman.unlock();
log_file->write_header("t_memman::trc_delete",
LOG_MEMORY, LOG_WARNING);
log_file->write_raw(filename);
log_file->write_raw(", line ");
log_file->write_raw(lineno);
log_file->write_raw(": pointer to ");
log_file->write_raw(ptr2str(p));
log_file->write_raw(" is deleted.\n");
log_file->write_raw("This pointer is not allocated however.\n");
log_file->write_footer();
return;
}
bool array_mismatch = (is_array != i->second.is_array);
// Check mixing of array new/delete
// NOTE: after the pointer has been erased from pointer_map, the
// iterator i is invalid.
// The mutex mtx_memman should be unlocked before logging to
// avoid dead locks.
if (array_mismatch) {
num_array_mixing++;
string allocation_filename = i->second.filename;
int allocation_lineno = i->second.lineno;
bool allocation_is_array = i->second.is_array;
pointer_map.erase(p);
mtx_memman.unlock();
log_file->write_header("t_memman::trc_delete",
LOG_MEMORY, LOG_WARNING);
log_file->write_raw(filename);
log_file->write_raw(", line ");
log_file->write_raw(lineno);
log_file->write_raw(": pointer to ");
log_file->write_raw(ptr2str(p));
log_file->write_raw(" is deleted ");
if (is_array) {
log_file->write_raw("as array (delete []).\n");
} else {
log_file->write_raw("normally (delete).\n");
}
log_file->write_raw("But it was allocated ");
if (allocation_is_array) {
log_file->write_raw("as array (new []) \n");
} else {
log_file->write_raw("normally (new) \n");
}
log_file->write_raw(allocation_filename);
log_file->write_raw(", line ");
log_file->write_raw(allocation_lineno);
log_file->write_endl();
log_file->write_footer();
} else {
pointer_map.erase(p);
mtx_memman.unlock();
}
}
void t_memman::report_leaks(void) {
mtx_memman.lock();
if (pointer_map.empty()) {
if (num_array_mixing == 0) {
log_file->write_report(
"All pointers have correctly been deallocated.",
"t_memman::report_leaks",
LOG_MEMORY, LOG_INFO);
} else {
log_file->write_header("t_memman::report_leaks",
LOG_MEMORY, LOG_WARNING);
log_file->write_raw("All pointers have been deallocated."),
log_file->write_raw(
"Mixing of array/non-array caused memory loss though.");
log_file->write_footer();
}
mtx_memman.unlock();
return;
}
log_file->write_header("t_memman::report_leaks", LOG_MEMORY, LOG_WARNING);
log_file->write_raw("The following pointers were never deallocated:\n");
for (map<void *, t_ptr_info>::const_iterator i = pointer_map.begin();
i != pointer_map.end(); i++)
{
log_file->write_raw(ptr2str(i->first));
log_file->write_raw(" allocated from ");
log_file->write_raw(i->second.filename);
log_file->write_raw(", line ");
log_file->write_raw(i->second.lineno);
log_file->write_endl();
}
log_file->write_footer();
mtx_memman.unlock();
}
void t_memman::report_stats(void) {
mtx_memman.lock();
log_file->write_header("t_memman::report_stats", LOG_MEMORY, LOG_INFO);
log_file->write_raw("Number of allocations: ");
log_file->write_raw(num_new);
log_file->write_endl();
log_file->write_raw("Number of duplicate allocations: ");
log_file->write_raw(num_new_duplicate);
log_file->write_endl();
log_file->write_raw("Number of de-allocations: ");
log_file->write_raw(num_delete);
log_file->write_endl();
log_file->write_raw("Number of mismatched de-allocations: ");
log_file->write_raw(num_delete_mismatch);
log_file->write_endl();
log_file->write_raw("Number of array/non-array mixed operations: ");
log_file->write_raw(num_array_mixing);
log_file->write_endl();
unsigned long num_unalloc = num_new - num_new_duplicate -
num_delete + num_delete_mismatch;
log_file->write_raw("Number of unallocated pointers: ");
log_file->write_raw(num_unalloc);
log_file->write_endl();
log_file->write_footer();
mtx_memman.unlock();
}
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