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use atomic read-modify-write increment for LLVM CLASSIC

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This commit is contained in:
hexcoder- 2021-04-17 21:29:50 +02:00
parent 70bf4b4ab0
commit 00e54565ef
1 changed files with 7 additions and 1 deletions
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8
instrumentation/afl-llvm-pass.so.cc
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@ -388,7 +388,6 @@ bool AFLCoverage::runOnModule(Module &M) {
#endif
// other constants we need
ConstantInt *Zero = ConstantInt::get(Int8Ty, 0);
ConstantInt *One = ConstantInt::get(Int8Ty, 1);
Value * PrevCtx = NULL; // CTX sensitive coverage
@ -628,6 +627,10 @@ bool AFLCoverage::runOnModule(Module &M) {
/* Update bitmap */
#if 1 /* Atomic */
IRB.CreateAtomicRMW(llvm::AtomicRMWInst::BinOp::Add, MapPtrIdx, One, llvm::AtomicOrdering::Monotonic);
#else
LoadInst *Counter = IRB.CreateLoad(MapPtrIdx);
Counter->setMetadata(M.getMDKindID("nosanitize"), MDNode::get(C, None));
@ -651,6 +654,7 @@ bool AFLCoverage::runOnModule(Module &M) {
* Counter + OverflowFlag -> Counter
*/
ConstantInt *Zero = ConstantInt::get(Int8Ty, 0);
auto cf = IRB.CreateICmpEQ(Incr, Zero);
auto carry = IRB.CreateZExt(cf, Int8Ty);
Incr = IRB.CreateAdd(Incr, carry);
@ -660,6 +664,8 @@ bool AFLCoverage::runOnModule(Module &M) {
IRB.CreateStore(Incr, MapPtrIdx)
->setMetadata(M.getMDKindID("nosanitize"), MDNode::get(C, None));
#endif /* non atomic case */
/* Update prev_loc history vector (by placing cur_loc at the head of the
vector and shuffle the other elements back by one) */