llvm/llvm/lib/CodeGen/AsmPrinter/WinCFGuard.cpp

//===-- CodeGen/AsmPrinter/WinCFGuard.cpp - Control Flow Guard Impl ------===//
//
// 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 contains support for writing the metadata for Windows Control Flow
// Guard, including address-taken functions and valid longjmp targets.
//
//===----------------------------------------------------------------------===//

#include "WinCFGuard.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCStreamer.h"

#include <vector>

usingnamespacellvm;

WinCFGuard::WinCFGuard(AsmPrinter *A) : … { … }

WinCFGuard::~WinCFGuard() = default;

void WinCFGuard::endFunction(const MachineFunction *MF) { … }

/// Returns true if this function's address is escaped in a way that might make
/// it an indirect call target. Function::hasAddressTaken gives different
/// results when a function is called directly with a function prototype
/// mismatch, which requires a cast.
static bool isPossibleIndirectCallTarget(const Function *F) { … }

MCSymbol *WinCFGuard::lookupImpSymbol(const MCSymbol *Sym) { … }

void WinCFGuard::endModule() { … }