forked from OSchip/llvm-project
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*===-- BasicBlockTracing.c - Support library for basic block tracing -----===*\
|
|
|*
|
|
|* The LLVM Compiler Infrastructure
|
|
|*
|
|
|* This file is distributed under the University of Illinois Open Source
|
|
|* License. See LICENSE.TXT for details.
|
|
|*
|
|
|*===----------------------------------------------------------------------===*|
|
|
|*
|
|
|* This file implements the call back routines for the basic block tracing
|
|
|* instrumentation pass. This should be used with the -trace-basic-blocks
|
|
|* LLVM pass.
|
|
|*
|
|
\*===----------------------------------------------------------------------===*/
|
|
|
|
#include "Profiling.h"
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
static unsigned *ArrayStart, *ArrayEnd, *ArrayCursor;
|
|
|
|
/* WriteAndFlushBBTraceData - write out the currently accumulated trace data
|
|
* and reset the cursor to point to the beginning of the buffer.
|
|
*/
|
|
static void WriteAndFlushBBTraceData () {
|
|
write_profiling_data(BBTraceInfo, ArrayStart, (ArrayCursor - ArrayStart));
|
|
ArrayCursor = ArrayStart;
|
|
}
|
|
|
|
/* BBTraceAtExitHandler - When the program exits, just write out any remaining
|
|
* data and free the trace buffer.
|
|
*/
|
|
static void BBTraceAtExitHandler(void) {
|
|
WriteAndFlushBBTraceData ();
|
|
free (ArrayStart);
|
|
}
|
|
|
|
/* llvm_trace_basic_block - called upon hitting a new basic block. */
|
|
void llvm_trace_basic_block (unsigned BBNum) {
|
|
*ArrayCursor++ = BBNum;
|
|
if (ArrayCursor == ArrayEnd)
|
|
WriteAndFlushBBTraceData ();
|
|
}
|
|
|
|
/* llvm_start_basic_block_tracing - This is the main entry point of the basic
|
|
* block tracing library. It is responsible for setting up the atexit
|
|
* handler and allocating the trace buffer.
|
|
*/
|
|
int llvm_start_basic_block_tracing(int argc, const char **argv,
|
|
unsigned *arrayStart, unsigned numElements) {
|
|
int Ret;
|
|
const unsigned BufferSize = 128 * 1024;
|
|
unsigned ArraySize;
|
|
|
|
Ret = save_arguments(argc, argv);
|
|
|
|
/* Allocate a buffer to contain BB tracing data */
|
|
ArraySize = BufferSize / sizeof (unsigned);
|
|
ArrayStart = malloc (ArraySize * sizeof (unsigned));
|
|
ArrayEnd = ArrayStart + ArraySize;
|
|
ArrayCursor = ArrayStart;
|
|
|
|
/* Set up the atexit handler. */
|
|
atexit (BBTraceAtExitHandler);
|
|
|
|
return Ret;
|
|
}
|