1/*===-- EdgeProfiling.c - Support library for 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 -insert-edge-profiling 12|* LLVM pass. 13|* 14\*===----------------------------------------------------------------------===*/ 15 16#include "Profiling.h" 17#include <stdlib.h> 18 19static unsigned *ArrayStart; 20static unsigned NumElements; 21 22/* EdgeProfAtExitHandler - When the program exits, just write out the profiling 23 * data. 24 */ 25static void EdgeProfAtExitHandler(void) { 26 /* Note that if this were doing something more intelligent with the 27 * instrumentation, we could do some computation here to expand what we 28 * collected into simple edge profiles. Since we directly count each edge, we 29 * just write out all of the counters directly. 30 */ 31 write_profiling_data(EdgeInfo, ArrayStart, NumElements); 32} 33 34 35/* llvm_start_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_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(EdgeProfAtExitHandler); 44 return Ret; 45} 46