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