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