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