forked from OSchip/llvm-project
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
//===-- FEntryInsertion.cpp - Patchable prologues for LLVM -------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file edits function bodies to insert fentry calls.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/TargetInstrInfo.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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#include "llvm/IR/Function.h"
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#include "llvm/InitializePasses.h"
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using namespace llvm;
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namespace {
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struct FEntryInserter : public MachineFunctionPass {
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static char ID; // Pass identification, replacement for typeid
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FEntryInserter() : MachineFunctionPass(ID) {
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initializeFEntryInserterPass(*PassRegistry::getPassRegistry());
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}
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bool runOnMachineFunction(MachineFunction &F) override;
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};
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}
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bool FEntryInserter::runOnMachineFunction(MachineFunction &MF) {
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const std::string FEntryName = std::string(
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MF.getFunction().getFnAttribute("fentry-call").getValueAsString());
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if (FEntryName != "true")
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return false;
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auto &FirstMBB = *MF.begin();
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auto *TII = MF.getSubtarget().getInstrInfo();
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BuildMI(FirstMBB, FirstMBB.begin(), DebugLoc(),
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TII->get(TargetOpcode::FENTRY_CALL));
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return true;
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}
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char FEntryInserter::ID = 0;
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char &llvm::FEntryInserterID = FEntryInserter::ID;
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INITIALIZE_PASS(FEntryInserter, "fentry-insert", "Insert fentry calls", false,
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false)
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