+ struct trace_arg *arg = a;
+
+ /* We are first called with address in the __backtrace function.
+ Skip it. */
+ if (arg->cnt != -1)
+ {
+ arg->array[arg->cnt] = (void *) _Unwind_GetIP(ctx);
+
+ /* Check whether we make any progress. */
+ if (arg->cnt > 0 && arg->array[arg->cnt - 1] == arg->array[arg->cnt])
+ return _URC_END_OF_STACK;
+ }
+ if (++arg->cnt == arg->size)
+ return _URC_END_OF_STACK;
+ return _URC_NO_REASON;
+}
+
+/** @brief reimplementation of glibc backtrace based directly on gcc library, without implicit malloc
+ *
+ * See http://webloria.loria.fr/~quinson/blog/2012/0208/system_programming_fun_in_SimGrid/
+ * for the motivation behind this function
+ * */
+
+int xbt_backtrace_no_malloc(void **array, int size) {
+
+ int i = 0;
+ for(i=0; i < size; i++)
+ array[i] = NULL;
+
+ struct trace_arg arg = { .array = array, .size = size, .cnt = -1 };
+
+ if (size >= 1)
+ _Unwind_Backtrace(backtrace_helper, &arg);
+
+ /* _Unwind_Backtrace on IA-64 seems to put NULL address above
+ _start. Fix it up here. */
+ if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
+ --arg.cnt;
+ return arg.cnt != -1 ? arg.cnt : 0;