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/****************************************************************************
* *
* GNATMEM COMPONENTS *
* *
* G M E M *
* *
* C Implementation File *
* *
* Copyright (C) 2000-2003 Free Software Foundation, Inc. *
* *
* GNAT is free software; you can redistribute it and/or modify it under *
* terms of the GNU General Public License as published by the Free Soft- *
* ware Foundation; either version 2, or (at your option) any later ver- *
* sion. GNAT is distributed in the hope that it will be useful, but WITH- *
* OUT 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 distributed with GNAT; see file COPYING. If not, write *
* to the Free Software Foundation, 51 Franklin Street, Fifth Floor, *
* Boston, MA 02110-1301, USA. *
* *
* As a special exception, if you link this file with other files to *
* produce an executable, this file does not by itself cause the resulting *
* executable to be covered by the GNU General Public License. This except- *
* ion does not however invalidate any other reasons why the executable *
* file might be covered by the GNU Public License. *
* *
* GNAT was originally developed by the GNAT team at New York University. *
* Extensive contributions were provided by Ada Core Technologies Inc. *
* *
****************************************************************************/
/* This unit reads the allocation tracking log produced by augmented
__gnat_malloc and __gnat_free procedures (see file a-raise.c) and
provides GNATMEM tool with gdb-compliant output. The output is
processed by GNATMEM to detect dynamic memory allocation errors.
See GNATMEM section in GNAT User's Guide for more information.
NOTE: This capability is currently supported on the following targets:
DEC Unix
GNU/Linux x86
Solaris (sparc and x86) (*)
Windows 98/95/NT (x86)
(*) on these targets, the compilation must be done with -funwind-tables to
be able to build the stack backtrace.
*/
#include <stdio.h>
static FILE *gmemfile;
/* tb_len is the number of call level supported by this module */
#define tb_len 200
static char * tracebk [tb_len];
static int cur_tb_len, cur_tb_pos;
#define LOG_EOF '*'
#define LOG_ALLOC 'A'
#define LOG_DEALL 'D'
struct struct_storage_elmt {
char Elmt;
void * Address;
size_t Size;
};
extern void
convert_addresses (char *addrs[], int n_addr, void *buf, int *len);
/* reads backtrace information from gmemfile placing them in tracebk
array. cur_tb_len is the size of this array
*/
static void
gmem_read_backtrace (void)
{
fread (&cur_tb_len, sizeof (int), 1, gmemfile);
fread (tracebk, sizeof (char *), cur_tb_len, gmemfile);
cur_tb_pos = 0;
}
/* initialize gmem feature from the dumpname file. It returns 1 if the
dumpname has been generated by GMEM (instrumented malloc/free) and 0 if not
(i.e. probably a GDB generated file).
*/
int __gnat_gmem_initialize (char *dumpname)
{
char header [10];
gmemfile = fopen (dumpname, "rb");
fread (header, 10, 1, gmemfile);
/* check for GMEM magic-tag */
if (memcmp (header, "GMEM DUMP\n", 10))
{
fclose (gmemfile);
return 0;
}
return 1;
}
/* initialize addr2line library */
void __gnat_gmem_a2l_initialize (char *exename)
{
extern char **gnat_argv;
char s [100];
int l;
gnat_argv [0] = exename;
convert_addresses (tracebk, 1, s, &l);
}
/* Read next allocation of deallocation information from the GMEM file and
write an alloc/free information in buf to be processed by gnatmem */
void
__gnat_gmem_read_next (struct struct_storage_elmt *buf)
{
void *addr;
size_t size;
int j;
j = fgetc (gmemfile);
if (j == EOF)
{
fclose (gmemfile);
buf->Elmt = LOG_EOF;
}
else
{
switch (j)
{
case 'A' :
buf->Elmt = LOG_ALLOC;
fread (&(buf->Address), sizeof (void *), 1, gmemfile);
fread (&(buf->Size), sizeof (size_t), 1, gmemfile);
break;
case 'D' :
buf->Elmt = LOG_DEALL;
fread (&(buf->Address), sizeof (void *), 1, gmemfile);
break;
default:
puts ("GNATMEM dump file corrupt");
__gnat_os_exit (1);
}
gmem_read_backtrace ();
}
}
/* Read the next frame from the current traceback, and move the cursor to the
next frame */
void __gnat_gmem_read_next_frame (void** addr)
{
if (cur_tb_pos >= cur_tb_len) {
*addr = NULL;
} else {
*addr = (void*)*(tracebk + cur_tb_pos);
++cur_tb_pos;
}
}
/* Converts addr into a symbolic traceback, and stores the result in buf
with a format suitable for gnatmem */
void __gnat_gmem_symbolic (void * addr, char* buf, int* length)
{
char* addresses [] = { (char*)addr };
extern char** gnat_argv;
convert_addresses (addresses, 1, buf, length);
}
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