+Constant *DataFlowSanitizer::getOrBuildTrampolineFunction(FunctionType *FT,
+ StringRef FName) {
+ FunctionType *FTT = getTrampolineFunctionType(FT);
+ Constant *C = Mod->getOrInsertFunction(FName, FTT);
+ Function *F = dyn_cast<Function>(C);
+ if (F && F->isDeclaration()) {
+ F->setLinkage(GlobalValue::LinkOnceODRLinkage);
+ BasicBlock *BB = BasicBlock::Create(*Ctx, "entry", F);
+ std::vector<Value *> Args;
+ Function::arg_iterator AI = F->arg_begin(); ++AI;
+ for (unsigned N = FT->getNumParams(); N != 0; ++AI, --N)
+ Args.push_back(&*AI);
+ CallInst *CI =
+ CallInst::Create(&F->getArgumentList().front(), Args, "", BB);
+ ReturnInst *RI;
+ if (FT->getReturnType()->isVoidTy())
+ RI = ReturnInst::Create(*Ctx, BB);
+ else
+ RI = ReturnInst::Create(*Ctx, CI, BB);
+
+ DFSanFunction DFSF(*this, F, /*IsNativeABI=*/true);
+ Function::arg_iterator ValAI = F->arg_begin(), ShadowAI = AI; ++ValAI;
+ for (unsigned N = FT->getNumParams(); N != 0; ++ValAI, ++ShadowAI, --N)
+ DFSF.ValShadowMap[ValAI] = ShadowAI;
+ DFSanVisitor(DFSF).visitCallInst(*CI);
+ if (!FT->getReturnType()->isVoidTy())
+ new StoreInst(DFSF.getShadow(RI->getReturnValue()),
+ &F->getArgumentList().back(), RI);
+ }
+
+ return C;
+}
+