/* -*- 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 .
 */

// This file is #include from backtrace.c

#include <dlfcn.h>
#include <pthread.h>
#include <setjmp.h>
#include <stddef.h>
#include <stdio.h>

/* no frame.h on FreeBSD */
struct frame {
    struct frame *fr_savfp;
    long    fr_savpc;
};

#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;

            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 );
    }
}


/* vim:set shiftwidth=4 softtabstop=4 expandtab: */