Removed mtrace.c file since it is not used (it seems it was a base for ktrace.c). Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>pull/12/head
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2A75B7CA8ADED5CF
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/* More debugging hooks for `malloc'.
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Copyright (C) 1991,92,93,94,96,97,98,99,2000 Free Software Foundation, Inc.
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Written April 2, 1991 by John Gilmore of Cygnus Support.
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Based on mcheck.c by Mike Haertel.
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Hacked by AK
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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The author may be reached (Email) at the address mike@ai.mit.edu,
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or (US mail) as Mike Haertel c/o Free Software Foundation. */
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#define _LIBC
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#define MALLOC_HOOKS
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#ifndef _MALLOC_INTERNAL
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#define _MALLOC_INTERNAL
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#include <malloc.h>
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#include <mcheck.h>
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#include <bits/libc-lock.h>
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#endif
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#include <dlfcn.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio-common/_itoa.h>
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#include <elf/ldsodefs.h>
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#ifdef USE_IN_LIBIO
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# include <libio/iolibio.h>
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# define setvbuf(s, b, f, l) _IO_setvbuf (s, b, f, l)
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#endif
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#define TRACE_BUFFER_SIZE 512
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static FILE *mallstream;
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static const char mallenv[]= "MALLOC_TRACE";
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static char malloc_trace_buffer[TRACE_BUFFER_SIZE];
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__libc_lock_define_initialized (static, lock)
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/* Address to breakpoint on accesses to... */
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__ptr_t mallwatch;
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/* File name and line number information, for callers that had
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the foresight to call through a macro. */
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char *_mtrace_file;
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int _mtrace_line;
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/* Old hook values. */
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static void (*tr_old_free_hook) __P ((__ptr_t ptr, const __ptr_t));
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static __ptr_t (*tr_old_malloc_hook) __P ((__malloc_size_t size,
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const __ptr_t));
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static __ptr_t (*tr_old_realloc_hook) __P ((__ptr_t ptr,
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__malloc_size_t size,
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const __ptr_t));
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#define TR_PIPELINE_SIZE 16
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#define TR_BT_SIZE 80
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#define TR_HASHTABLE_SIZE 9973
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#define TR_NONE 0
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#define TR_MALLOC 1
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#define TR_REALLOC 2
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#define TR_FREE 3
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typedef struct {
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int op;
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__ptr_t ptr;
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__ptr_t old;
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__malloc_size_t size;
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int bt_size;
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void *bt[TR_BT_SIZE+1];
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} tr_entry;
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static tr_entry tr_pipeline[TR_PIPELINE_SIZE];
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static int tr_pipeline_pos;
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static void *tr_hashtable[TR_HASHTABLE_SIZE];
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/* This function is called when the block being alloc'd, realloc'd, or
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freed has an address matching the variable "mallwatch". In a debugger,
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set "mallwatch" to the address of interest, then put a breakpoint on
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tr_break. */
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void tr_break __P ((void));
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void
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tr_break ()
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{
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}
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static void
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tr_backtrace(void **bt, int size)
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{
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char buf[20];
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int i;
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Dl_info info;
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for(i = 0; i < size; i++)
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{
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long hash = (((unsigned long)bt[i]) / 4) % TR_HASHTABLE_SIZE;
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if ((tr_hashtable[hash]!= bt[i]) && _dl_addr(bt[i], &info) && info.dli_fname && *info.dli_fname)
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{
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if (bt[i] >= (void *) info.dli_saddr)
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sprintf(buf, "+%#lx", (unsigned long)(bt[i] - info.dli_saddr));
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else
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sprintf(buf, "-%#lx", (unsigned long)(info.dli_saddr - bt[i]));
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fprintf(mallstream, "%s%s%s%s%s[%p]\n",
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info.dli_fname ?: "",
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info.dli_sname ? "(" : "",
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info.dli_sname ?: "",
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info.dli_sname ? buf : "",
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info.dli_sname ? ")" : "",
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bt[i]);
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tr_hashtable[hash] = bt[i];
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}
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else {
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fprintf(mallstream, "[%p]\n", bt[i]);
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}
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}
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}
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static void
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inline
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tr_log(const __ptr_t caller, __ptr_t ptr, __ptr_t old, __malloc_size_t size, int op)
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{
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switch(op)
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{
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case TR_REALLOC:
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break;
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case TR_MALLOC:
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break;
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case TR_FREE:
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{
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int i = tr_pipeline_pos;
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do {
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if (i) i--; else i = TR_PIPELINE_SIZE-1;
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if (tr_pipeline[i].ptr == ptr)
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{
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if (tr_pipeline[i].op == TR_MALLOC)
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{
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tr_pipeline[i].op = TR_NONE;
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tr_pipeline[i].ptr = NULL;
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return;
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}
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break;
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}
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} while (i != tr_pipeline_pos);
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}
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}
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if (tr_pipeline[tr_pipeline_pos].op)
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{
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putc('@', mallstream);
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putc('\n', mallstream);
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/* Generate backtrace...
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* We throw out the first frame (tr_mallochook)
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* end the last one (_start)
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*/
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tr_backtrace(&(tr_pipeline[tr_pipeline_pos].bt[1]),
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tr_pipeline[tr_pipeline_pos].bt_size-2);
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switch(tr_pipeline[tr_pipeline_pos].op)
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{
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case TR_MALLOC:
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fprintf (mallstream, "+ %p %#lx\n",
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tr_pipeline[tr_pipeline_pos].ptr,
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(unsigned long int) tr_pipeline[tr_pipeline_pos].size);
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break;
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case TR_FREE:
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fprintf (mallstream, "- %p\n",
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tr_pipeline[tr_pipeline_pos].ptr);
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break;
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case TR_REALLOC:
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fprintf (mallstream, "< %p\n",
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tr_pipeline[tr_pipeline_pos].old);
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fprintf (mallstream, "> %p %#lx\n",
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tr_pipeline[tr_pipeline_pos].ptr,
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(unsigned long int) tr_pipeline[tr_pipeline_pos].size);
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break;
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}
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}
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tr_pipeline[tr_pipeline_pos].op = op;
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tr_pipeline[tr_pipeline_pos].ptr = ptr;
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tr_pipeline[tr_pipeline_pos].old = old;
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tr_pipeline[tr_pipeline_pos].size = size;
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tr_pipeline[tr_pipeline_pos].bt_size = backtrace(
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tr_pipeline[tr_pipeline_pos].bt, TR_BT_SIZE);
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tr_pipeline_pos++;
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if (tr_pipeline_pos == TR_PIPELINE_SIZE)
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tr_pipeline_pos = 0;
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}
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static void tr_freehook __P ((__ptr_t, const __ptr_t));
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static void
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tr_freehook (ptr, caller)
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__ptr_t ptr;
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const __ptr_t caller;
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{
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if (ptr == NULL)
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return;
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__libc_lock_lock (lock);
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tr_log(caller, ptr, 0, 0, TR_FREE );
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__libc_lock_unlock (lock);
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if (ptr == mallwatch)
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tr_break ();
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__libc_lock_lock (lock);
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__free_hook = tr_old_free_hook;
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if (tr_old_free_hook != NULL)
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(*tr_old_free_hook) (ptr, caller);
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else
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free (ptr);
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__free_hook = tr_freehook;
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__libc_lock_unlock (lock);
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}
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static __ptr_t tr_mallochook __P ((__malloc_size_t, const __ptr_t));
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static __ptr_t
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tr_mallochook (size, caller)
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__malloc_size_t size;
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const __ptr_t caller;
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{
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__ptr_t hdr;
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__libc_lock_lock (lock);
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__malloc_hook = tr_old_malloc_hook;
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if (tr_old_malloc_hook != NULL)
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hdr = (__ptr_t) (*tr_old_malloc_hook) (size, caller);
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else
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hdr = (__ptr_t) malloc (size);
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__malloc_hook = tr_mallochook;
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tr_log(caller, hdr, 0, size, TR_MALLOC);
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__libc_lock_unlock (lock);
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if (hdr == mallwatch)
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tr_break ();
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return hdr;
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}
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static __ptr_t tr_reallochook __P ((__ptr_t, __malloc_size_t, const __ptr_t));
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static __ptr_t
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tr_reallochook (ptr, size, caller)
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__ptr_t ptr;
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__malloc_size_t size;
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const __ptr_t caller;
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{
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__ptr_t hdr;
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if (ptr == mallwatch)
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tr_break ();
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__libc_lock_lock (lock);
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__free_hook = tr_old_free_hook;
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__malloc_hook = tr_old_malloc_hook;
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__realloc_hook = tr_old_realloc_hook;
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if (tr_old_realloc_hook != NULL)
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hdr = (__ptr_t) (*tr_old_realloc_hook) (ptr, size, caller);
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else
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hdr = (__ptr_t) realloc (ptr, size);
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__free_hook = tr_freehook;
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__malloc_hook = tr_mallochook;
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__realloc_hook = tr_reallochook;
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tr_log(caller, hdr, ptr, size, TR_REALLOC);
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__libc_lock_unlock (lock);
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if (hdr == mallwatch)
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tr_break ();
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return hdr;
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}
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#ifdef _LIBC
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extern void __libc_freeres (void);
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/* This function gets called to make sure all memory the library
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allocates get freed and so does not irritate the user when studying
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the mtrace output. */
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static void
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release_libc_mem (void)
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{
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/* Only call the free function if we still are running in mtrace mode. */
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if (mallstream != NULL)
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__libc_freeres ();
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}
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#endif
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/* We enable tracing if either the environment variable MALLOC_TRACE
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is set, or if the variable mallwatch has been patched to an address
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that the debugging user wants us to stop on. When patching mallwatch,
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don't forget to set a breakpoint on tr_break! */
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void
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mtrace ()
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{
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#ifdef _LIBC
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static int added_atexit_handler;
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#endif
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char *mallfile;
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/* Don't panic if we're called more than once. */
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if (mallstream != NULL)
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return;
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#ifdef _LIBC
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/* When compiling the GNU libc we use the secure getenv function
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which prevents the misuse in case of SUID or SGID enabled
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programs. */
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mallfile = __secure_getenv (mallenv);
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#else
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mallfile = getenv (mallenv);
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#endif
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if (mallfile != NULL || mallwatch != NULL)
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{
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mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null", "w");
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if (mallstream != NULL)
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{
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/* Be sure it doesn't malloc its buffer! */
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setvbuf (mallstream, malloc_trace_buffer, _IOFBF, TRACE_BUFFER_SIZE);
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fprintf (mallstream, "= Start\n");
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tr_old_free_hook = __free_hook;
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__free_hook = tr_freehook;
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tr_old_malloc_hook = __malloc_hook;
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__malloc_hook = tr_mallochook;
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tr_old_realloc_hook = __realloc_hook;
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__realloc_hook = tr_reallochook;
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tr_pipeline_pos = TR_PIPELINE_SIZE;
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for(;tr_pipeline_pos--;)
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{
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tr_pipeline[tr_pipeline_pos].op = TR_NONE;
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tr_pipeline[tr_pipeline_pos].ptr = NULL;
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}
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memset(tr_hashtable, 0, sizeof(void *)*TR_HASHTABLE_SIZE);
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#ifdef _LIBC
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if (!added_atexit_handler)
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{
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added_atexit_handler = 1;
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atexit (release_libc_mem);
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}
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#endif
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}
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}
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}
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void
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muntrace ()
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{
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if (mallstream == NULL)
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return;
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fprintf (mallstream, "= End\n");
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fclose (mallstream);
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mallstream = NULL;
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__free_hook = tr_old_free_hook;
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__malloc_hook = tr_old_malloc_hook;
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__realloc_hook = tr_old_realloc_hook;
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}
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