================
@@ -461,6 +463,162 @@ bool PreISelIntrinsicLowering::expandMemIntrinsicUses(
return Changed;
}
+namespace {
+
+enum class PointerEncoding {
+ Rotate,
+ PACCopyable,
+ PACNonCopyable,
+};
+
+bool expandProtectedFieldPtr(Function &Intr) {
+ Module &M = *Intr.getParent();
+
+ SmallPtrSet<GlobalValue *, 2> DSsToDeactivate;
+ SmallPtrSet<Instruction *, 2> LoadsStores;
+
+ Type *Int8Ty = Type::getInt8Ty(M.getContext());
+ Type *Int64Ty = Type::getInt64Ty(M.getContext());
+ PointerType *PtrTy = PointerType::get(M.getContext(), 0);
+
+ Function *SignIntr =
+ Intrinsic::getOrInsertDeclaration(&M, Intrinsic::ptrauth_sign, {});
+ Function *AuthIntr =
+ Intrinsic::getOrInsertDeclaration(&M, Intrinsic::ptrauth_auth, {});
+
+ auto *EmuFnTy = FunctionType::get(Int64Ty, {Int64Ty, Int64Ty}, false);
+ FunctionCallee EmuSignIntr = M.getOrInsertFunction("__emupac_pacda",
EmuFnTy);
+ FunctionCallee EmuAuthIntr = M.getOrInsertFunction("__emupac_autda",
EmuFnTy);
+
+ auto CreateSign = [&](IRBuilder<> &B, Value *Val, Value *Disc,
+ OperandBundleDef DSBundle) {
+ Function *F = B.GetInsertBlock()->getParent();
+ Attribute FSAttr = F->getFnAttribute("target-features");
+ if (FSAttr.isValid() && FSAttr.getValueAsString().contains("+pauth"))
+ return B.CreateCall(SignIntr, {Val, B.getInt32(2), Disc}, DSBundle);
+ return B.CreateCall(EmuSignIntr, {Val, Disc}, DSBundle);
+ };
+
+ auto CreateAuth = [&](IRBuilder<> &B, Value *Val, Value *Disc,
+ OperandBundleDef DSBundle) {
+ Function *F = B.GetInsertBlock()->getParent();
+ Attribute FSAttr = F->getFnAttribute("target-features");
+ if (FSAttr.isValid() && FSAttr.getValueAsString().contains("+pauth"))
+ return B.CreateCall(AuthIntr, {Val, B.getInt32(2), Disc}, DSBundle);
+ return B.CreateCall(EmuAuthIntr, {Val, Disc}, DSBundle);
+ };
+
+ auto GetDeactivationSymbol = [&](CallInst *Call) -> GlobalValue * {
+ if (auto Bundle =
+ Call->getOperandBundle(LLVMContext::OB_deactivation_symbol))
+ return cast<GlobalValue>(Bundle->Inputs[0]);
+ return nullptr;
+ };
+
+ for (User *U : Intr.users()) {
+ auto *Call = cast<CallInst>(U);
+ auto *DS = GetDeactivationSymbol(Call);
+
+ for (Use &U : Call->uses()) {
+ if (auto *LI = dyn_cast<LoadInst>(U.getUser())) {
+ if (isa<PointerType>(LI->getType())) {
+ LoadsStores.insert(LI);
+ continue;
+ }
+ }
+ if (auto *SI = dyn_cast<StoreInst>(U.getUser())) {
+ if (U.getOperandNo() == 1 &&
+ isa<PointerType>(SI->getValueOperand()->getType())) {
+ LoadsStores.insert(SI);
+ continue;
+ }
+ }
+ // Comparisons against null cannot be used to recover the original
+ // pointer so we allow them.
+ if (auto *CI = dyn_cast<ICmpInst>(U.getUser())) {
+ if (auto *Op = dyn_cast<Constant>(CI->getOperand(0)))
+ if (Op->isNullValue())
+ continue;
+ if (auto *Op = dyn_cast<Constant>(CI->getOperand(1)))
+ if (Op->isNullValue())
+ continue;
+ }
+ if (DS)
+ DSsToDeactivate.insert(DS);
+ }
+ }
+
+ for (Instruction *I : LoadsStores) {
+ auto *PointerOperand = isa<StoreInst>(I)
+ ? cast<StoreInst>(I)->getPointerOperand()
+ : cast<LoadInst>(I)->getPointerOperand();
----------------
nikic wrote:
getLoadStorePointerOperand
https://github.com/llvm/llvm-project/pull/151647
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