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303 | /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <sal/types.h>
#ifdef __sun
#include <dlfcn.h>
#include <pthread.h>
#include <setjmp.h>
#include <stdio.h>
#include <sys/frame.h>
#include "backtrace.h"
#if defined(SPARC)
#if defined IS_LP64
#define FRAME_PTR_OFFSET 1
#define FRAME_OFFSET 0
#define STACK_BIAS 0x7ff
#else
#define FRAME_PTR_OFFSET 1
#define FRAME_OFFSET 0
#define STACK_BIAS 0
#endif
#elif defined( INTEL )
#define FRAME_PTR_OFFSET 3
#define FRAME_OFFSET 0
#define STACK_BIAS 0
#else
#error Unknown Solaris target platform.
#endif /* defined SPARC or INTEL */
int backtrace( void **buffer, int max_frames )
{
jmp_buf ctx;
long fpval;
struct frame *fp;
int i;
/* flush register windows */
#ifdef SPARC
asm("ta 3");
#endif
/* get stack- and framepointer */
setjmp(ctx);
fpval = ((long*)(ctx))[FRAME_PTR_OFFSET];
fp = (struct frame*)((char*)(fpval) + STACK_BIAS);
for (i = 0; (i < FRAME_OFFSET) && (fp != 0); i++)
fp = (struct frame*)((char*)(fp->fr_savfp) + STACK_BIAS);
/* iterate through backtrace */
for (i = 0; (fp != 0) && (fp->fr_savpc != 0) && (i < max_frames); i++)
{
/* saved (prev) frame */
struct frame * prev = (struct frame*)((char*)(fp->fr_savfp) + STACK_BIAS);
/* store frame */
*(buffer++) = (void*)(fp->fr_savpc);
/* prev frame (w/ stack growing top down) */
fp = (prev > fp) ? prev : 0;
}
/* return number of frames stored */
return i;
}
char ** backtrace_symbols(void * const * buffer, int size)
{
(void)buffer; (void)size;
return NULL; /*TODO*/
}
void backtrace_symbols_fd( void **buffer, int size, int fd )
{
FILE *fp = fdopen( fd, "w" );
if ( fp )
{
void **pFramePtr;
for ( pFramePtr = buffer; size > 0 && pFramePtr && *pFramePtr; pFramePtr++, size-- )
{
Dl_info dli;
ptrdiff_t offset;<--- The scope of the variable 'offset' can be reduced. [+]The scope of the variable 'offset' can be reduced. Warning: Be careful when fixing this message, especially when there are inner loops. Here is an example where cppcheck will write that the scope for 'i' can be reduced:
void f(int x)
{
int i = 0;
if (x) {
// it's safe to move 'int i = 0;' here
for (int n = 0; n < 10; ++n) {
// it is possible but not safe to move 'int i = 0;' here
do_something(&i);
}
}
}
When you see this message it is always safe to reduce the variable scope 1 level.
if ( 0 != dladdr( *pFramePtr, &dli ) )
{
if ( dli.dli_fname && dli.dli_fbase )
{
offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_fbase;
fprintf( fp, "%s+0x%" SAL_PRI_PTRDIFFT "x", dli.dli_fname, offset );
}
if ( dli.dli_sname && dli.dli_saddr )
{
offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_saddr;
fprintf( fp, "(%s+0x%" SAL_PRI_PTRDIFFT "x)", dli.dli_sname, offset );
}
}
fprintf( fp, "[%p]\n", *pFramePtr );
}
fclose( fp );
}
}
#elif defined FREEBSD || defined NETBSD || defined OPENBSD || defined(DRAGONFLY)
#include <dlfcn.h>
#include <pthread.h>
#include <setjmp.h>
#include <stddef.h>
#include <stdio.h>
#include "backtrace.h"
#if defined(POWERPC) || defined(POWERPC64)
#define FRAME_PTR_OFFSET 1
#define FRAME_OFFSET 0
#else
#define FRAME_PTR_OFFSET 3
#define FRAME_OFFSET 0
#endif
int backtrace( void **buffer, int max_frames )
{
struct frame *fp;
jmp_buf ctx;
int i;
/* get stack- and framepointer */
setjmp(ctx);
fp = (struct frame*)(((size_t*)(ctx))[FRAME_PTR_OFFSET]);
for ( i=0; (i<FRAME_OFFSET) && (fp!=0); i++)
fp = fp->fr_savfp;
/* iterate through backtrace */
for (i=0; fp && fp->fr_savpc && i<max_frames; i++)
{
/* store frame */
*(buffer++) = (void *)fp->fr_savpc;
/* next frame */
fp=fp->fr_savfp;
}
return i;
}
char ** backtrace_symbols(void * const * buffer, int size)
{
(void)buffer; (void)size;
return NULL; /*TODO*/
}
void backtrace_symbols_fd( void **buffer, int size, int fd )
{
FILE *fp = fdopen( fd, "w" );
if ( fp )
{
void **pFramePtr;
for ( pFramePtr = buffer; size > 0 && pFramePtr && *pFramePtr; pFramePtr++, size-- )
{
Dl_info dli;
ptrdiff_t offset;<--- The scope of the variable 'offset' can be reduced. [+]The scope of the variable 'offset' can be reduced. Warning: Be careful when fixing this message, especially when there are inner loops. Here is an example where cppcheck will write that the scope for 'i' can be reduced:
void f(int x)
{
int i = 0;
if (x) {
// it's safe to move 'int i = 0;' here
for (int n = 0; n < 10; ++n) {
// it is possible but not safe to move 'int i = 0;' here
do_something(&i);
}
}
}
When you see this message it is always safe to reduce the variable scope 1 level.
if ( 0 != dladdr( *pFramePtr, &dli ) )
{
if ( dli.dli_fname && dli.dli_fbase )
{
offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_fbase;
fprintf( fp, "%s+0x%" SAL_PRI_PTRDIFFT "x", dli.dli_fname, offset );
}
if ( dli.dli_sname && dli.dli_saddr )
{
offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_saddr;
fprintf( fp, "(%s+0x%" SAL_PRI_PTRDIFFT "x)", dli.dli_sname, offset );
}
}
fprintf( fp, "[%p]\n", *pFramePtr );
}
fclose( fp );
}
}
#elif defined( MACOSX )
#include <dlfcn.h>
#include <stdio.h>
#include "backtrace.h"
/* glib backtrace is only available on MacOsX 10.5 or higher
so we do it on our own */
int backtrace( void **buffer, int max_frames )
{
void **frame = (void **)__builtin_frame_address(0);
void **bp = ( void **)(*frame);
void *ip = frame[1];
int i;
for ( i = 0; bp && ip && i < max_frames; i++ )
{
*(buffer++) = ip;
ip = bp[1];
bp = (void**)(bp[0]);
}
return i;
}
char ** backtrace_symbols(void * const * buffer, int size)
{
(void)buffer; (void)size;
return NULL; /*TODO*/
}
void backtrace_symbols_fd( void **buffer, int size, int fd )
{
FILE *fp = fdopen( fd, "w" );
if ( fp )
{
void **pFramePtr;
for ( pFramePtr = buffer; size > 0 && pFramePtr && *pFramePtr; pFramePtr++, size-- )
{
Dl_info dli;
if ( 0 != dladdr( *pFramePtr, &dli ) )
{
ptrdiff_t offset;
if ( dli.dli_fname && dli.dli_fbase )
{
offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_fbase;
fprintf( fp, "%s+0x%tx", dli.dli_fname, offset );
}
if ( dli.dli_sname && dli.dli_saddr )
{
offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_saddr;
fprintf( fp, "(%s+0x%tx)", dli.dli_sname, offset );
}
}
fprintf( fp, "[%p]\n", *pFramePtr );
}
fclose( fp );
}
}
#elif !defined LINUX
int backtrace( void **buffer, int max_frames )
{
(void)buffer; (void)max_frames;
return 0;
}
char ** backtrace_symbols(void * const * buffer, int size)
{
(void)buffer; (void)size;
return NULL; /*TODO*/
}
void backtrace_symbols_fd( void **buffer, int size, int fd )
{
(void)buffer; (void)size; (void)fd;
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|