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/****************************************************************************
* *
* GNATMEM COMPONENTS *
* *
* G M E M *
* *
* C Implementation File *
* *
* Copyright (C) 2000-2007, 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 memtrack.adb) 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)
Alpha OpenVMS
(*) 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 void * 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;
long long Timestamp;
};
static void
__gnat_convert_addresses (void *addrs[], int n_addrs, void *buf, int *len);
/* Place in BUF a string representing the symbolic translation of N_ADDRS raw
addresses provided in ADDRS. LEN is filled with the result length.
This is a GNAT specific interface to the libaddr2line convert_addresses
routine. The latter examines debug info from a provided executable file
name to perform the translation into symbolic form of an input sequence of
raw binary addresses. It attempts to open the file from the provided name
"as is", so an an absolute path must be provided to ensure the file is
always found. We compute this name once, at initialization time. */
static const char * exename = 0;
extern void convert_addresses (const char * , void *[], int, void *, int *);
extern char *__gnat_locate_exec_on_path (char *);
/* ??? Both of these extern functions are prototyped in adaint.h, which
also refers to "time_t" hence needs complex extra header inclusions to
be satisfied on every target. */
static void
__gnat_convert_addresses (void *addrs[], int n_addrs, void *buf, int *len)
{
if (exename != 0)
convert_addresses (exename, addrs, n_addrs, buf, len);
else
*len = 0;
}
/* 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 (void *), cur_tb_len, gmemfile);
cur_tb_pos = 0;
}
/* initialize gmem feature from the dumpname file. It returns t0 timestamp
if the dumpname has been generated by GMEM (instrumented malloc/free)
and 0 if not.
*/
long long __gnat_gmem_initialize (char *dumpname)
{
char header [10];
long long t0;
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;
}
fread (&t0, sizeof (long long), 1, gmemfile);
return t0;
}
/* initialize addr2line library */
void __gnat_gmem_a2l_initialize (char *exearg)
{
/* Resolve the executable filename to use in later invocations of
the libaddr2line symbolization service. */
exename = __gnat_locate_exec_on_path (exearg);
}
/* 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);
fread (&(buf->Timestamp), sizeof (long long), 1, gmemfile);
break;
case 'D' :
buf->Elmt = LOG_DEALL;
fread (&(buf->Address), sizeof (void *), 1, gmemfile);
fread (&(buf->Timestamp), sizeof (long long), 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)
{
void * addresses [] = { addr };
__gnat_convert_addresses (addresses, 1, buf, length);
}
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