forked from OSchip/llvm-project
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
//===-- EHContGuardCatchret.cpp - Catchret target symbols -------*- C++ -*-===//
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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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/// \file
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/// This file contains a machine function pass to insert a symbol before each
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/// valid catchret target and store this in the MachineFunction's
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/// CatchRetTargets vector. This will be used to emit the table of valid targets
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/// used by EHCont Guard.
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///
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/Statistic.h"
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/InitializePasses.h"
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using namespace llvm;
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#define DEBUG_TYPE "ehcontguard-catchret"
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STATISTIC(EHContGuardCatchretTargets,
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"Number of EHCont Guard catchret targets");
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namespace {
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/// MachineFunction pass to insert a symbol before each valid catchret target
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/// and store these in the MachineFunction's CatchRetTargets vector.
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class EHContGuardCatchret : public MachineFunctionPass {
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public:
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static char ID;
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EHContGuardCatchret() : MachineFunctionPass(ID) {
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initializeEHContGuardCatchretPass(*PassRegistry::getPassRegistry());
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}
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StringRef getPassName() const override {
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return "EH Cont Guard catchret targets";
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}
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bool runOnMachineFunction(MachineFunction &MF) override;
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};
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} // end anonymous namespace
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char EHContGuardCatchret::ID = 0;
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INITIALIZE_PASS(EHContGuardCatchret, "EHContGuardCatchret",
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"Insert symbols at valid catchret targets for /guard:ehcont",
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false, false)
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FunctionPass *llvm::createEHContGuardCatchretPass() {
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return new EHContGuardCatchret();
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}
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bool EHContGuardCatchret::runOnMachineFunction(MachineFunction &MF) {
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// Skip modules for which the ehcontguard flag is not set.
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if (!MF.getMMI().getModule()->getModuleFlag("ehcontguard"))
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return false;
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// Skip functions that do not have catchret
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if (!MF.hasEHCatchret())
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return false;
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bool Result = false;
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for (MachineBasicBlock &MBB : MF) {
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if (MBB.isEHCatchretTarget()) {
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MF.addCatchretTarget(MBB.getEHCatchretSymbol());
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EHContGuardCatchretTargets++;
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Result = true;
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}
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}
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return Result;
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}
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