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/* simple.c -- The backtrace_simple function.

Written by Ian Lance Taylor, Google.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are

met:

(1) Redistributions of source code must retain the above copyright

notice, this list of conditions and the following disclaimer.

(2) Redistributions in binary form must reproduce the above copyright

notice, this list of conditions and the following disclaimer in

the documentation and/or other materials provided with the

distribution.

(3) The name of the author may not be used to

endorse or promote products derived from this software without

specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,

INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE. */

#include "config.h"

#include "unwind.h"

#include "backtrace.h"

/* The simple_backtrace routine. */

/* Data passed through _Unwind_Backtrace. */

struct backtrace_simple_data

{

/* Number of frames to skip. */

int skip;

/* Library state. */

struct backtrace_state *state;

/* Callback routine. */

backtrace_simple_callback callback;

/* Error callback routine. */

backtrace_error_callback error_callback;

/* Data to pass to callback routine. */

void *data;

/* Value to return from backtrace. */

int ret;

};

/* Unwind library callback routine. This is passd to

_Unwind_Backtrace. */

static _Unwind_Reason_Code

simple_unwind (struct _Unwind_Context *context, void *vdata)

{

struct backtrace_simple_data *bdata = (struct backtrace_simple_data *) vdata;

uintptr_t pc;

int ip_before_insn = 0;

#ifdef HAVE_GETIPINFO

pc = _Unwind_GetIPInfo (context, &ip_before_insn);

#else

pc = _Unwind_GetIP (context);

#endif

if (bdata->skip > 0)

{

--bdata->skip;

return _URC_NO_REASON;

}

if (!ip_before_insn)

--pc;

bdata->ret = bdata->callback (bdata->data, pc);

if (bdata->ret != 0)

return _URC_END_OF_STACK;

return _URC_NO_REASON;

}

/* Get a simple stack backtrace. */

int

backtrace_simple (struct backtrace_state *state, int skip,

backtrace_simple_callback callback,

backtrace_error_callback error_callback, void *data)

{

struct backtrace_simple_data bdata;

bdata.skip = skip + 1;

bdata.state = state;

bdata.callback = callback;

bdata.error_callback = error_callback;

bdata.data = data;

bdata.ret = 0;

_Unwind_Backtrace (simple_unwind, &bdata);

return bdata.ret;

}

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