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[lib/Fuzzer] remove -use_coverage_pairs=1, an experimental feature that is unlikely to ever scale

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238063 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany
2015-05-22 22:47:03 +00:00
parent b3fdcb3739
commit 464deacf05
5 changed files with 1 additions and 30 deletions
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24
lib/Fuzzer/FuzzerLoop.cpp
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@@ -161,8 +161,6 @@ size_t Fuzzer::RunOne(const Unit &U) {
size_t Res = 0;
if (Options.UseFullCoverageSet)
Res = RunOneMaximizeFullCoverageSet(U);
else if (Options.UseCoveragePairs)
Res = RunOneMaximizeCoveragePairs(U);
else
Res = RunOneMaximizeTotalCoverage(U);
auto UnitStopTime = system_clock::now();
@@ -214,28 +212,6 @@ void Fuzzer::ExecuteCallback(const Unit &U) {
}
}
// Experimental. Does not yet scale.
// Fuly reset the current coverage state, run a single unit,
// collect all coverage pairs and return non-zero if a new pair is observed.
size_t Fuzzer::RunOneMaximizeCoveragePairs(const Unit &U) {
__sanitizer_reset_coverage();
ExecuteCallback(U);
uintptr_t *PCs;
uintptr_t NumPCs = __sanitizer_get_coverage_guards(&PCs);
bool HasNewPairs = false;
for (uintptr_t i = 0; i < NumPCs; i++) {
if (!PCs[i]) continue;
for (uintptr_t j = 0; j < NumPCs; j++) {
if (!PCs[j]) continue;
uint64_t Pair = (i << 32) | j;
HasNewPairs |= CoveragePairs.insert(Pair).second;
}
}
if (HasNewPairs)
return CoveragePairs.size();
return 0;
}
// Experimental.
// Fuly reset the current coverage state, run a single unit,
// compute a hash function from the full coverage set,