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 19 static unsigned *ArrayStart; 20 static unsigned NumElements; 21 22 /* OptEdgeProfAtExitHandler - When the program exits, just write out the 23 * profiling data. 24 */ 25 static 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 */ 38 int 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
