1 //===- MCWinEH.h - Windows Unwinding Support --------------------*- C++ -*-===// 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 #ifndef LLVM_MC_MCWINEH_H 11 #define LLVM_MC_MCWINEH_H 12 13 #include "llvm/ADT/MapVector.h" 14 #include <vector> 15 16 namespace llvm { 17 class MCSection; 18 class MCStreamer; 19 class MCSymbol; 20 21 namespace WinEH { 22 struct Instruction { 23 const MCSymbol *Label; 24 unsigned Offset; 25 unsigned Register; 26 unsigned Operation; 27 InstructionInstruction28 Instruction(unsigned Op, MCSymbol *L, unsigned Reg, unsigned Off) 29 : Label(L), Offset(Off), Register(Reg), Operation(Op) {} 30 }; 31 32 struct FrameInfo { 33 const MCSymbol *Begin = nullptr; 34 const MCSymbol *End = nullptr; 35 const MCSymbol *FuncletOrFuncEnd = nullptr; 36 const MCSymbol *ExceptionHandler = nullptr; 37 const MCSymbol *Function = nullptr; 38 const MCSymbol *PrologEnd = nullptr; 39 const MCSymbol *Symbol = nullptr; 40 const MCSection *TextSection = nullptr; 41 42 bool HandlesUnwind = false; 43 bool HandlesExceptions = false; 44 45 int LastFrameInst = -1; 46 const FrameInfo *ChainedParent = nullptr; 47 std::vector<Instruction> Instructions; 48 MapVector<MCSymbol*, std::vector<Instruction>> EpilogMap; 49 50 FrameInfo() = default; FrameInfoFrameInfo51 FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel) 52 : Begin(BeginFuncEHLabel), Function(Function) {} FrameInfoFrameInfo53 FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel, 54 const FrameInfo *ChainedParent) 55 : Begin(BeginFuncEHLabel), Function(Function), 56 ChainedParent(ChainedParent) {} 57 }; 58 59 class UnwindEmitter { 60 public: 61 virtual ~UnwindEmitter(); 62 63 /// This emits the unwind info sections (.pdata and .xdata in PE/COFF). 64 virtual void Emit(MCStreamer &Streamer) const = 0; 65 virtual void EmitUnwindInfo(MCStreamer &Streamer, FrameInfo *FI) const = 0; 66 }; 67 } 68 } 69 70 #endif 71