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/*===-- BlockProfiling.c - Support library for block profiling ------------===*\
|*
|* The LLVM Compiler Infrastructure
|*
|* This file was developed by the LLVM research group and is distributed under
|* the University of Illinois Open Source License. See LICENSE.TXT for details.
|*
|*===----------------------------------------------------------------------===*|
|*
|* This file implements the call back routines for the block profiling
|* instrumentation pass. This should be used with the -insert-block-profiling
|* LLVM pass.
|*
\*===----------------------------------------------------------------------===*/
#include "Profiling.h"
#include <stdlib.h>
static unsigned *ArrayStart;
static unsigned NumElements;
/* BlockProfAtExitHandler - When the program exits, just write out the profiling
* data.
*/
static void BlockProfAtExitHandler() {
/* Note that if this were doing something more intelligent with the
* instrumentation, we could do some computation here to expand what we
* collected into simple block profiles. (Or we could do it in llvm-prof.)
* Regardless, we directly count each block, so no expansion is necessary.
*/
write_profiling_data(BlockInfo, ArrayStart, NumElements);
}
/* llvm_start_block_profiling - This is the main entry point of the block
* profiling library. It is responsible for setting up the atexit handler.
*/
int llvm_start_block_profiling(int argc, const char **argv,
unsigned *arrayStart, unsigned numElements) {
int Ret = save_arguments(argc, argv);
ArrayStart = arrayStart;
NumElements = numElements;
atexit(BlockProfAtExitHandler);
return Ret;
}
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