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 MCContext; 17 class MCSection; 18 class MCStreamer; 19 class MCSymbol; 20 class StringRef; 21 22 namespace WinEH { 23 struct Instruction { 24 const MCSymbol *Label; 25 const unsigned Offset; 26 const unsigned Register; 27 const unsigned Operation; 28 29 Instruction(unsigned Op, MCSymbol *L, unsigned Reg, unsigned Off) 30 : Label(L), Offset(Off), Register(Reg), Operation(Op) {} 31 }; 32 33 struct FrameInfo { 34 const MCSymbol *Begin; 35 const MCSymbol *End; 36 const MCSymbol *ExceptionHandler; 37 const MCSymbol *Function; 38 const MCSymbol *PrologEnd; 39 const MCSymbol *Symbol; 40 41 bool HandlesUnwind; 42 bool HandlesExceptions; 43 44 int LastFrameInst; 45 const FrameInfo *ChainedParent; 46 std::vector<Instruction> Instructions; 47 48 FrameInfo() 49 : Begin(nullptr), End(nullptr), ExceptionHandler(nullptr), 50 Function(nullptr), PrologEnd(nullptr), Symbol(nullptr), 51 HandlesUnwind(false), HandlesExceptions(false), LastFrameInst(-1), 52 ChainedParent(nullptr), Instructions() {} 53 FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel) 54 : Begin(BeginFuncEHLabel), End(nullptr), ExceptionHandler(nullptr), 55 Function(Function), PrologEnd(nullptr), Symbol(nullptr), 56 HandlesUnwind(false), HandlesExceptions(false), LastFrameInst(-1), 57 ChainedParent(nullptr), Instructions() {} 58 FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel, 59 const FrameInfo *ChainedParent) 60 : Begin(BeginFuncEHLabel), End(nullptr), ExceptionHandler(nullptr), 61 Function(Function), PrologEnd(nullptr), Symbol(nullptr), 62 HandlesUnwind(false), HandlesExceptions(false), LastFrameInst(-1), 63 ChainedParent(ChainedParent), Instructions() {} 64 }; 65 66 class UnwindEmitter { 67 public: 68 static MCSection *getPDataSection(const MCSymbol *Function, 69 MCContext &Context); 70 static MCSection *getXDataSection(const MCSymbol *Function, 71 MCContext &Context); 72 73 virtual ~UnwindEmitter() { } 74 75 // 76 // This emits the unwind info sections (.pdata and .xdata in PE/COFF). 77 // 78 virtual void Emit(MCStreamer &Streamer) const = 0; 79 virtual void EmitUnwindInfo(MCStreamer &Streamer, FrameInfo *FI) const = 0; 80 }; 81 } 82 } 83 84 #endif 85
