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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Link this tiny library to a binary compiled with
// -fsanitize-coverage=inline-8bit-counters.
// When passed SANCOV_OUT=OUTPUT_PATH, the process will
// dump the 8-bit coverage counters to the file, assuming
// the regular exit() is called.
//
// See OutOfProcessFuzzTarget.cpp for usage.
#include <stdio.h>
#include <stdlib.h>
static char *CovStart, *CovEnd;
static void DumpCoverage() {
if (const char *DumpPath = getenv("SANCOV_OUT")) {
fprintf(stderr, "SanCovDump: %p %p %s\n", CovStart, CovEnd, DumpPath);
if (FILE *f = fopen(DumpPath, "w")) {
fwrite(CovStart, 1, CovEnd - CovStart, f);
fclose(f);
}
}
}
extern "C" void __sanitizer_cov_8bit_counters_init(char *Start, char *End) {
CovStart = Start;
CovEnd = End;
atexit(DumpCoverage);
}
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