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/**************************************************************************
*
* Copyright 2010 Luca Barbieri
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#if defined(DEBUG) && (!defined(PIPE_OS_WINDOWS) || defined(PIPE_SUBSYSTEM_WINDOWS_USER))
/* see http://www.mozilla.org/performance/refcnt-balancer.html for what do with the output
* on Linux, use tools/addr2line.sh to postprocess it before anything else
**/
#include <util/u_debug.h>
#include <util/u_debug_refcnt.h>
#include <util/u_debug_stack.h>
#include <util/u_debug_symbol.h>
#include <util/u_string.h>
#include <util/u_hash_table.h>
#include <os/os_thread.h>
#include <os/os_stream.h>
int debug_refcnt_state;
struct os_stream* stream;
/* TODO: maybe move this serial machinery to a stand-alone module and expose it? */
static pipe_mutex serials_mutex;
static struct util_hash_table* serials_hash;
static unsigned serials_last;
static unsigned hash_ptr(void* p)
{
return (unsigned)(uintptr_t)p;
}
static int compare_ptr(void* a, void* b)
{
if(a == b)
return 0;
else if(a < b)
return -1;
else
return 1;
}
static boolean debug_serial(void* p, unsigned* pserial)
{
unsigned serial;
boolean found = TRUE;
pipe_mutex_lock(serials_mutex);
if(!serials_hash)
serials_hash = util_hash_table_create(hash_ptr, compare_ptr);
serial = (unsigned)(uintptr_t)util_hash_table_get(serials_hash, p);
if(!serial)
{
/* time to stop logging... (you'll have a 100 GB logfile at least at this point)
* TODO: avoid this
*/
serial = ++serials_last;
if(!serial)
{
debug_error("More than 2^32 objects detected, aborting.\n");
os_abort();
}
util_hash_table_set(serials_hash, p, (void*)(uintptr_t)serial);
found = FALSE;
}
pipe_mutex_unlock(serials_mutex);
*pserial = serial;
return found;
}
static void debug_serial_delete(void* p)
{
pipe_mutex_lock(serials_mutex);
util_hash_table_remove(serials_hash, p);
pipe_mutex_unlock(serials_mutex);
}
#define STACK_LEN 64
static void dump_stack(const char* symbols[STACK_LEN])
{
unsigned i;
for(i = 0; i < STACK_LEN; ++i)
{
if(symbols[i])
os_stream_printf(stream, "%s\n", symbols[i]);
}
os_stream_write(stream, "\n", 1);
}
void debug_reference_slowpath(const struct pipe_reference* p, debug_reference_descriptor get_desc, int change)
{
if(debug_refcnt_state < 0)
return;
if(!debug_refcnt_state)
{
const char* filename = debug_get_option("GALLIUM_REFCNT_LOG", NULL);
if(filename && filename[0])
stream = os_file_stream_create(filename);
if(stream)
debug_refcnt_state = 1;
else
debug_refcnt_state = -1;
}
if(debug_refcnt_state > 0)
{
struct debug_stack_frame frames[STACK_LEN];
const char* symbols[STACK_LEN];
char buf[1024];
unsigned i;
unsigned refcnt = p->count;
unsigned serial;
boolean existing = debug_serial((void*)p, &serial);
debug_backtrace_capture(frames, 1, STACK_LEN);
for(i = 0; i < STACK_LEN; ++i)
{
if(frames[i].function)
symbols[i] = debug_symbol_name_cached(frames[i].function);
else
symbols[i] = 0;
}
get_desc(buf, p);
if(!existing)
{
os_stream_printf(stream, "<%s> %p %u Create\n", buf, p, serial);
dump_stack(symbols);
/* this is there to provide a gradual change even if we don't see the initialization */
for(i = 1; i <= refcnt - change; ++i)
{
os_stream_printf(stream, "<%s> %p %u AddRef %u\n", buf, p, serial, i);
dump_stack(symbols);
}
}
if(change)
{
os_stream_printf(stream, "<%s> %p %u %s %u\n", buf, p, serial, change > 0 ? "AddRef" : "Release", refcnt);
dump_stack(symbols);
}
if(!refcnt)
{
debug_serial_delete((void*)p);
os_stream_printf(stream, "<%s> %p %u Destroy\n", buf, p, serial);
dump_stack(symbols);
}
os_stream_flush(stream);
}
}
#endif
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