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 <vector> 14 15 namespace llvm { 16 class MCSection; 17 class MCStreamer; 18 class MCSymbol; 19 20 namespace WinEH { 21 struct Instruction { 22 const MCSymbol *Label; 23 const unsigned Offset; 24 const unsigned Register; 25 const unsigned Operation; 26 27 Instruction(unsigned Op, MCSymbol *L, unsigned Reg, unsigned Off) 28 : Label(L), Offset(Off), Register(Reg), Operation(Op) {} 29 }; 30 31 struct FrameInfo { 32 const MCSymbol *Begin = nullptr; 33 const MCSymbol *End = nullptr; 34 const MCSymbol *ExceptionHandler = nullptr; 35 const MCSymbol *Function = nullptr; 36 const MCSymbol *PrologEnd = nullptr; 37 const MCSymbol *Symbol = nullptr; 38 const MCSection *TextSection = nullptr; 39 40 bool HandlesUnwind = false; 41 bool HandlesExceptions = false; 42 43 int LastFrameInst = -1; 44 const FrameInfo *ChainedParent = nullptr; 45 std::vector<Instruction> Instructions; 46 47 FrameInfo() = default; 48 FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel) 49 : Begin(BeginFuncEHLabel), Function(Function) {} 50 FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel, 51 const FrameInfo *ChainedParent) 52 : Begin(BeginFuncEHLabel), Function(Function), 53 ChainedParent(ChainedParent) {} 54 }; 55 56 class UnwindEmitter { 57 public: 58 virtual ~UnwindEmitter(); 59 60 /// This emits the unwind info sections (.pdata and .xdata in PE/COFF). 61 virtual void Emit(MCStreamer &Streamer) const = 0; 62 virtual void EmitUnwindInfo(MCStreamer &Streamer, FrameInfo *FI) const = 0; 63 }; 64 } 65 } 66 67 #endif 68
