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[libFuzzer] don't emit callbacks to sanitizer run-time in -fsanitize-coverage=trace-pc mode; update libFuzzer doc for previous commit

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llvm-svn: 262110
This commit is contained in:
Kostya Serebryany 2016-02-27 05:45:12 +00:00
parent bbfba6fb1c
commit 2e7a6d59f7
3 changed files with 15 additions and 11 deletions
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1
docs/LibFuzzer.rst
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@ -82,6 +82,7 @@ The most important flags are::
only_ascii 0 If 1, generate only ASCII (isprint+isspace) inputs.
artifact_prefix "" Write fuzzing artifacts (crash, timeout, or slow inputs) as $(artifact_prefix)file
exact_artifact_path "" Write the single artifact on failure (crash, timeout) as $(exact_artifact_path). This overrides -artifact_prefix and will not use checksum in the file name. Do not use the same path for several parallel processes.
print_final_stats 0 If 1, print statistics at exit.
For the full list of flags run the fuzzer binary with ``-help=1``.

24
lib/Transforms/Instrumentation/SanitizerCoverage.cpp
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@ -294,18 +294,20 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
new GlobalVariable(M, ModNameStrConst->getType(), true,
GlobalValue::PrivateLinkage, ModNameStrConst);
Function *CtorFunc;
std::tie(CtorFunc, std::ignore) = createSanitizerCtorAndInitFunctions(
M, kSanCovModuleCtorName, kSanCovModuleInitName,
{Int32PtrTy, IntptrTy, Int8PtrTy, Int8PtrTy},
{IRB.CreatePointerCast(RealGuardArray, Int32PtrTy),
ConstantInt::get(IntptrTy, N),
Options.Use8bitCounters
? IRB.CreatePointerCast(RealEightBitCounterArray, Int8PtrTy)
: Constant::getNullValue(Int8PtrTy),
IRB.CreatePointerCast(ModuleName, Int8PtrTy)});
if (!Options.TracePC) {
Function *CtorFunc;
std::tie(CtorFunc, std::ignore) = createSanitizerCtorAndInitFunctions(
M, kSanCovModuleCtorName, kSanCovModuleInitName,
{Int32PtrTy, IntptrTy, Int8PtrTy, Int8PtrTy},
{IRB.CreatePointerCast(RealGuardArray, Int32PtrTy),
ConstantInt::get(IntptrTy, N),
Options.Use8bitCounters
? IRB.CreatePointerCast(RealEightBitCounterArray, Int8PtrTy)
: Constant::getNullValue(Int8PtrTy),
IRB.CreatePointerCast(ModuleName, Int8PtrTy)});
appendToGlobalCtors(M, CtorFunc, kSanCtorAndDtorPriority);
appendToGlobalCtors(M, CtorFunc, kSanCtorAndDtorPriority);
}
return true;
}

1
test/Instrumentation/SanitizerCoverage/tracing.ll
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@ -40,3 +40,4 @@ entry:
; CHECK_PC: call void @__sanitizer_cov_trace_pc
; CHECK_PC-NOT: call void @__sanitizer_cov_trace_pc
; CHECK_PC: ret void
; CHECK_PC-NOT: call void @__sanitizer_cov_module_init