16e051f0b9
This change splits out the renaming and comment updates from #129612 as a non-functional change.
84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
//===-- EHContGuardTargets.cpp - EH continuation 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 target where the unwinder in Windows may continue exectution after an
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/// exception is thrown and store this in the MachineFunction's EHContTargets
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/// vector. This will be used to emit the table of valid targets used by Windows
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/// EH Continuation 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/IR/Module.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(EHContGuardTargetsFound, "Number of EHCont Guard 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 EHContGuardTargets : public MachineFunctionPass {
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public:
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static char ID;
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EHContGuardTargets() : MachineFunctionPass(ID) {
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initializeEHContGuardTargetsPass(*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 EHContGuardTargets::ID = 0;
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INITIALIZE_PASS(EHContGuardTargets, "EHContGuardTargets",
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"Insert symbols at valid targets for /guard:ehcont", false,
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false)
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FunctionPass *llvm::createEHContGuardTargetsPass() {
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return new EHContGuardTargets();
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}
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bool EHContGuardTargets::runOnMachineFunction(MachineFunction &MF) {
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// Skip modules for which the ehcontguard flag is not set.
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if (!MF.getFunction().getParent()->getModuleFlag("ehcontguard"))
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return false;
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// Skip functions that do not have targets
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if (!MF.hasEHContTarget())
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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.isEHContTarget()) {
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MF.addEHContTarget(MBB.getEHContSymbol());
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EHContGuardTargetsFound++;
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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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