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// name-finder.cc - Convert addresses to names
/* Copyright (C) 2000 Red Hat Inc
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
/**
* @author Andrew Haley <aph@cygnus.com>
* @date Jan 6 2000
*/
/* _Jv_name_finder is a class wrapper around a mechanism that can
convert address of methods to their names and the names of files in
which they appear.
Right now, the only implementation of this involves running a copy
of addr2line, but at some point it is worth building this
functionality into libgcj, if only for embedded systems. */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include <config.h>
#include <string.h>
#include <gcj/cni.h>
#include <jvm.h>
#include <java/lang/Object.h>
#include <java-threads.h>
#include <java/lang/Throwable.h>
#include <java/io/PrintStream.h>
#include <java/io/PrintWriter.h>
#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#include <name-finder.h>
/* Create a new name finder which will perform address lookups on an
executable. */
_Jv_name_finder::_Jv_name_finder (char *executable)
{
#if defined (HAVE_PIPE) && defined (HAVE_FORK) && defined (HAVE_EXECVP)
error = 0;
char *argv[6];
{
int arg = 0;
argv[arg++] = "addr2line";
argv[arg++] = "-C";
argv[arg++] = "-f";
argv[arg++] = "-e";
argv[arg++] = executable;
argv[arg] = NULL;
}
error |= pipe (f_pipe) < 0;
error |= pipe (b_pipe) < 0;
if (error)
return;
pid = fork ();
if (pid == 0)
{
close (f_pipe[1]);
close (b_pipe[0]);
dup2 (f_pipe[0], fileno (stdin));
dup2 (b_pipe[1], fileno (stdout));
execvp (argv[0], argv);
_exit (127);
}
close (f_pipe [0]);
close (b_pipe [1]);
if (pid < 0)
{
error |= 1;
return;
}
b_pipe_fd = fdopen (b_pipe[0], "r");
error |= !b_pipe_fd;
#endif
}
/* Convert a pointer to hex. */
void
_Jv_name_finder::toHex (void *p)
{
unsigned long long n = (unsigned long long)p;
int digits = sizeof (void *) * 2;
strcpy (hex, "0x");
for (int i = digits - 1; i >= 0; i--)
{
int digit = n % 16;
n /= 16;
hex[i+2] = digit > 9 ? 'a' + digit - 10 : '0' + digit;
}
hex [digits+2] = 0;
}
/* Given a pointer to a function or method, try to convert it into a
name and the appropriate line and source file. The caller passes
the code pointer in p.
Returns false if the lookup fails. Even if this happens, the field
he will have been correctly filled in with the pointer. */
bool
_Jv_name_finder::lookup (void *p)
{
toHex (p);
#if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR)
{
Dl_info dl_info;
if (dladdr (p, &dl_info))
{
strncpy (file_name, dl_info.dli_fname, sizeof file_name);
strncpy (method_name, dl_info.dli_sname, sizeof method_name);
return true;
}
}
#endif
#if defined (HAVE_PIPE) && defined (HAVE_FORK) && defined (HAVE_EXECVP)
if (error)
return false;
error |= write (f_pipe[1], hex, strlen (hex)) < 0;
if (error)
return false;
error |= write (f_pipe[1], "\n", 1) < 0;
if (error)
return false;
error |= (fgets (method_name, sizeof method_name, b_pipe_fd) == NULL);
if (error)
return false;
error |= (fgets (file_name, sizeof file_name, b_pipe_fd) == NULL);
if (error)
return false;
char *newline = strchr (method_name, '\n');
if (newline)
*newline = 0;
newline = strchr (file_name, '\n');
if (newline)
*newline = 0;
return true;
#else
return false;
#endif /* defined (HAVE_PIPE) && defined (HAVE_FORK) && defined (HAVE_EXECVP) */
}
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