1 //===-- CodeGen/AsmPrinter/WinCFGuard.cpp - Control Flow Guard Impl ------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains support for writing Win64 exception info into asm files. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "WinCFGuard.h" 15 #include "llvm/CodeGen/AsmPrinter.h" 16 #include "llvm/CodeGen/MachineFunction.h" 17 #include "llvm/CodeGen/MachineModuleInfo.h" 18 #include "llvm/CodeGen/MachineOperand.h" 19 #include "llvm/IR/Constants.h" 20 #include "llvm/IR/Metadata.h" 21 #include "llvm/MC/MCAsmInfo.h" 22 #include "llvm/MC/MCObjectFileInfo.h" 23 #include "llvm/MC/MCStreamer.h" 24 25 #include <vector> 26 27 using namespace llvm; 28 WinCFGuard(AsmPrinter * A)29WinCFGuard::WinCFGuard(AsmPrinter *A) : AsmPrinterHandler(), Asm(A) {} 30 ~WinCFGuard()31WinCFGuard::~WinCFGuard() {} 32 endModule()33void WinCFGuard::endModule() { 34 const Module *M = Asm->MMI->getModule(); 35 std::vector<const Function *> Functions; 36 for (const Function &F : *M) 37 if (F.hasAddressTaken()) 38 Functions.push_back(&F); 39 if (Functions.empty()) 40 return; 41 auto &OS = *Asm->OutStreamer; 42 OS.SwitchSection(Asm->OutContext.getObjectFileInfo()->getGFIDsSection()); 43 for (const Function *F : Functions) 44 OS.EmitCOFFSymbolIndex(Asm->getSymbol(F)); 45 } 46