| //===-- FEntryInsertion.cpp - Patchable prologues for LLVM -------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // 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/CodeGen/TargetFrameLowering.h" |
| #include "llvm/CodeGen/TargetInstrInfo.h" |
| #include "llvm/CodeGen/TargetSubtargetInfo.h" |
| #include "llvm/IR/Function.h" |
| #include "llvm/IR/Module.h" |
| #include "llvm/InitializePasses.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 = std::string( |
| MF.getFunction().getFnAttribute("fentry-call").getValueAsString()); |
| if (FEntryName != "true") |
| return false; |
| |
| auto &FirstMBB = *MF.begin(); |
| auto *TII = MF.getSubtarget().getInstrInfo(); |
| BuildMI(FirstMBB, FirstMBB.begin(), DebugLoc(), |
| 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) |