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//===-- 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/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/Function.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)
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