1 //===- MCWinEH.h - Windows Unwinding Support --------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLVM_MC_MCWINEH_H 10 #define LLVM_MC_MCWINEH_H 11 12 #include "llvm/ADT/MapVector.h" 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 unsigned Offset; 24 unsigned Register; 25 unsigned Operation; 26 InstructionInstruction27 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 *FuncletOrFuncEnd = nullptr; 35 const MCSymbol *ExceptionHandler = nullptr; 36 const MCSymbol *Function = nullptr; 37 const MCSymbol *PrologEnd = nullptr; 38 const MCSymbol *Symbol = nullptr; 39 const MCSection *TextSection = nullptr; 40 41 bool HandlesUnwind = false; 42 bool HandlesExceptions = false; 43 44 int LastFrameInst = -1; 45 const FrameInfo *ChainedParent = nullptr; 46 std::vector<Instruction> Instructions; 47 MapVector<MCSymbol*, std::vector<Instruction>> EpilogMap; 48 49 FrameInfo() = default; FrameInfoFrameInfo50 FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel) 51 : Begin(BeginFuncEHLabel), Function(Function) {} FrameInfoFrameInfo52 FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel, 53 const FrameInfo *ChainedParent) 54 : Begin(BeginFuncEHLabel), Function(Function), 55 ChainedParent(ChainedParent) {} 56 }; 57 58 class UnwindEmitter { 59 public: 60 virtual ~UnwindEmitter(); 61 62 /// This emits the unwind info sections (.pdata and .xdata in PE/COFF). 63 virtual void Emit(MCStreamer &Streamer) const = 0; 64 virtual void EmitUnwindInfo(MCStreamer &Streamer, FrameInfo *FI) const = 0; 65 }; 66 } 67 } 68 69 #endif 70