//===-- FEntryInsertion.cpp - Patchable prologues for LLVM -------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file edits function bodies to insert fentry calls. // //===----------------------------------------------------------------------===// #include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineFunctionPass.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/Passes.h" #include "llvm/IR/Function.h" #include "llvm/IR/Module.h" #include "llvm/Target/TargetFrameLowering.h" #include "llvm/Target/TargetInstrInfo.h" #include "llvm/Target/TargetSubtargetInfo.h" using namespace llvm; namespace { struct FEntryInserter : public MachineFunctionPass { static char ID; // Pass identification, replacement for typeid FEntryInserter() : MachineFunctionPass(ID) { initializeFEntryInserterPass(*PassRegistry::getPassRegistry()); } bool runOnMachineFunction(MachineFunction &F) override; }; } bool FEntryInserter::runOnMachineFunction(MachineFunction &MF) { const std::string FEntryName = MF.getFunction()->getFnAttribute("fentry-call").getValueAsString(); if (FEntryName != "true") return false; auto &FirstMBB = *MF.begin(); auto &FirstMI = *FirstMBB.begin(); auto *TII = MF.getSubtarget().getInstrInfo(); BuildMI(FirstMBB, FirstMI, FirstMI.getDebugLoc(), TII->get(TargetOpcode::FENTRY_CALL)); return true; } char FEntryInserter::ID = 0; char &llvm::FEntryInserterID = FEntryInserter::ID; INITIALIZE_PASS(FEntryInserter, "fentry-insert", "Insert fentry calls", false, false)