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[libFuzzer] remove a piece of stale code 

llvm-svn: 247067
This commit is contained in:
Kostya Serebryany 2015-09-08 20:40:10 +00:00
parent 9cdea94f66
commit 4b82de2e47
1 changed files with 1 additions and 41 deletions
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42
llvm/lib/Fuzzer/FuzzerTraceState.cpp
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@ -166,38 +166,6 @@ struct LabelRange {
}
};
// A passport for a CMP site. We want to keep track of where the given CMP is
// and how many times it is evaluated to true or false.
struct CmpSitePassport {
uintptr_t PC;
size_t Counter[2];
bool IsInterestingCmpTarget() {
static const size_t kRareEnough = 50;
size_t C0 = Counter[0];
size_t C1 = Counter[1];
return C0 > kRareEnough * (C1 + 1) || C1 > kRareEnough * (C0 + 1);
}
};
// For now, just keep a simple imprecise hash table PC => CmpSitePassport.
// Potentially, will need to have a compiler support to have a precise mapping
// and also thread-safety.
struct CmpSitePassportTable {
static const size_t kSize = 99991; // Prime.
CmpSitePassport Passports[kSize];
CmpSitePassport *GetPassport(uintptr_t PC) {
uintptr_t Idx = PC & kSize;
CmpSitePassport *Res = &Passports[Idx];
if (Res->PC == 0) // Not thread safe.
Res->PC = PC;
return Res->PC == PC ? Res : nullptr;
}
};
static CmpSitePassportTable CSPTable; // Zero initialized.
// For now, very simple: put Size bytes of Data at position Pos.
struct TraceBasedMutation {
size_t Pos;
@ -349,16 +317,8 @@ void TraceState::TraceCmpCallback(uintptr_t PC, size_t CmpSize, size_t CmpType,
uint64_t Arg1, uint64_t Arg2) {
if (!RecordingTraces) return;
int Added = 0;
CmpSitePassport *CSP = CSPTable.GetPassport(PC);
if (!CSP) return;
CSP->Counter[ComputeCmp(CmpSize, CmpType, Arg1, Arg2)]++;
size_t C0 = CSP->Counter[0];
size_t C1 = CSP->Counter[1];
// FIXME: is this a good idea or a bad?
// if (!CSP->IsInterestingCmpTarget())
// return;
if (Options.Verbosity >= 3)
Printf("TraceCmp: %p %zd/%zd; %zd %zd\n", CSP->PC, C0, C1, Arg1, Arg2);
Printf("TraceCmp %zd/%zd: %p %zd %zd\n", CmpSize, CmpType, PC, Arg1, Arg2);
Added += TryToAddDesiredData(Arg1, Arg2, CmpSize);
Added += TryToAddDesiredData(Arg2, Arg1, CmpSize);
if (!Added && CmpSize == 4 && IsTwoByteData(Arg1) && IsTwoByteData(Arg2)) {