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[LibFuzzer] Report when custom counters are available.
ClosedPublic

Authored by delcypher on Apr 15 2018, 11:25 AM.

Reviewers

kcc
george.karpenkov

Commits

Summary

[LibFuzzer] Report when custom counters are available.

This upstreams a feature from the JFS solver's fork of LibFuzzer.

Don't hard code number of counters because this number is not stable.

LGTM

This revision is now accepted and ready to land.Apr 16 2018, 1:07 PM

This revision was automatically updated to reflect the committed changes.

Path

Size

lib/

fuzzer/

3 lines

test/

fuzzer/

1 line

Show First 20 Lines • Show All 128 Lines • ▼ Show 20 Lines	if ((NumGuards && NumGuards != NumPCsInPCTables) \|\|
"please contact the libFuzzer developers.\n"		"please contact the libFuzzer developers.\n"
"Also check https://bugs.llvm.org/show_bug.cgi?id=34636\n"		"Also check https://bugs.llvm.org/show_bug.cgi?id=34636\n"
"for possible workarounds (tl;dr: don't use the old GNU ld)\n");		"for possible workarounds (tl;dr: don't use the old GNU ld)\n");
_Exit(1);		_Exit(1);
}		}
}		}
if (size_t NumClangCounters = ClangCountersEnd() - ClangCountersBegin())		if (size_t NumClangCounters = ClangCountersEnd() - ClangCountersBegin())
Printf("INFO: %zd Clang Coverage Counters\n", NumClangCounters);		Printf("INFO: %zd Clang Coverage Counters\n", NumClangCounters);

		if (size_t NumExtraCounters = ExtraCountersEnd() - ExtraCountersBegin())
		Printf("INFO: %zd Extra Counters\n", NumExtraCounters);
}		}

ATTRIBUTE_NO_SANITIZE_ALL		ATTRIBUTE_NO_SANITIZE_ALL
void TracePC::HandleCallerCallee(uintptr_t Caller, uintptr_t Callee) {		void TracePC::HandleCallerCallee(uintptr_t Caller, uintptr_t Callee) {
const uintptr_t kBits = 12;		const uintptr_t kBits = 12;
const uintptr_t kMask = (1 << kBits) - 1;		const uintptr_t kMask = (1 << kBits) - 1;
uintptr_t Idx = (Caller & kMask) \| ((Callee & kMask) << kBits);		uintptr_t Idx = (Caller & kMask) \| ((Callee & kMask) << kBits);
ValueProfileMap.AddValueModPrime(Idx);		ValueProfileMap.AddValueModPrime(Idx);
▲ Show 20 Lines • Show All 458 Lines • Show Last 20 Lines

	REQUIRES: linux			REQUIRES: linux

	RUN: %cpp_compiler %S/TableLookupTest.cpp -o %t-TableLookupTest			RUN: %cpp_compiler %S/TableLookupTest.cpp -o %t-TableLookupTest
	RUN: not %t-TableLookupTest -print_final_stats=1 2>&1 \| FileCheck %s			RUN: not %t-TableLookupTest -print_final_stats=1 2>&1 \| FileCheck %s
				CHECK: INFO: {{[0-9]+}} Extra Counters
	CHECK: BINGO			CHECK: BINGO
	// Expecting >= 4096 new_units_added			// Expecting >= 4096 new_units_added
	CHECK: stat::new_units_added:{{.*[4][0-9][0-9][0-9]}}			CHECK: stat::new_units_added:{{.*[4][0-9][0-9][0-9]}}