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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "backtrace.h"
#if defined(__i386__)
// use GLIBC version, hope it works
extern int backtrace(void **buffer, int size);
#define HAVE_BACKTRACE
#endif
#if defined(__x86_64__)
/**
Written by Arne H. J. based on docs:
http://www.kernel.org/pub/linux/devel/gcc/unwind/
http://www.codesourcery.com/public/cxx-abi/abi-eh.html
http://refspecs.freestandards.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/libgcc-s-ddefs.html
**/
#include <unwind.h>
struct trace_context {
void **array;
int size;
int index;
};
static _Unwind_Reason_Code
trace_fn(struct _Unwind_Context *ctxt, void *arg)
{
struct trace_context *tp = (struct trace_context *)arg;
void *ip = (void *)_Unwind_GetIP(ctxt);
if (ip == 0) {
return _URC_END_OF_STACK;
}
if (tp->index <= tp->size) {
// there's no point filling in the address of the backtrace()
// function itself, that doesn't provide any extra information,
// so skip one level
if (tp->index > 0) {
tp->array[tp->index - 1] = ip;
}
tp->index++;
} else {
return _URC_NORMAL_STOP;
}
return _URC_NO_REASON; // "This is not the destination frame" -> try next frame
}
#define HAVE_BACKTRACE
int
backtrace (void **array, int size)
{
struct trace_context t;
t.array = array;
t.size = size;
t.index = 0;
_Unwind_Backtrace(trace_fn, &t);
return t.index - 1;
}
#endif // x86_64
#ifdef HAVE_BACKTRACE
int
FastOS_backtrace (void **array, int size)
{
return backtrace(array, size);
}
#else
# warning "backtrace not supported on this CPU"
int
FastOS_backtrace (void **array, int size)
{
(void) array;
(void) size;
return 0;
}
#endif
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