1/*===-- OptimalEdgeProfiling.c - Support library for opt. edge profiling --===*\ 2|* 3|* The LLVM Compiler Infrastructure 4|* 5|* This file is distributed under the University of Illinois Open Source 6|* License. See LICENSE.TXT for details. 7|* 8|*===----------------------------------------------------------------------===*| 9|* 10|* This file implements the call back routines for the edge profiling 11|* instrumentation pass. This should be used with the 12|* -insert-opt-edge-profiling LLVM pass. 13|* 14\*===----------------------------------------------------------------------===*/ 15 16#include "Profiling.h" 17#include <stdlib.h> 18 19static unsigned *ArrayStart; 20static unsigned NumElements; 21 22/* OptEdgeProfAtExitHandler - When the program exits, just write out the 23 * profiling data. 24 */ 25static void OptEdgeProfAtExitHandler(void) { 26 /* Note that, although the array has a counter for each edge, not all 27 * counters are updated, the ones that are not used are initialised with -1. 28 * When loading this information the counters with value -1 have to be 29 * recalculated, it is guaranteed that this is possible. 30 */ 31 write_profiling_data(OptEdgeInfo, ArrayStart, NumElements); 32} 33 34 35/* llvm_start_opt_edge_profiling - This is the main entry point of the edge 36 * profiling library. It is responsible for setting up the atexit handler. 37 */ 38int llvm_start_opt_edge_profiling(int argc, const char **argv, 39 unsigned *arrayStart, unsigned numElements) { 40 int Ret = save_arguments(argc, argv); 41 ArrayStart = arrayStart; 42 NumElements = numElements; 43 atexit(OptEdgeProfAtExitHandler); 44 return Ret; 45} 46