| //===- MCWin64EH.h - Machine Code Win64 EH support --------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains declarations to support the Win64 Exception Handling |
| // scheme in MC. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_MC_MCWIN64EH_H |
| #define LLVM_MC_MCWIN64EH_H |
| |
| #include "llvm/Support/Win64EH.h" |
| #include <cassert> |
| #include <vector> |
| |
| namespace llvm { |
| class StringRef; |
| class MCStreamer; |
| class MCSymbol; |
| |
| class MCWin64EHInstruction { |
| public: |
| typedef Win64EH::UnwindOpcodes OpType; |
| private: |
| OpType Operation; |
| MCSymbol *Label; |
| unsigned Offset; |
| unsigned Register; |
| public: |
| MCWin64EHInstruction(OpType Op, MCSymbol *L, unsigned Reg) |
| : Operation(Op), Label(L), Offset(0), Register(Reg) { |
| assert(Op == Win64EH::UOP_PushNonVol); |
| } |
| MCWin64EHInstruction(MCSymbol *L, unsigned Size) |
| : Operation(Size>128 ? Win64EH::UOP_AllocLarge : Win64EH::UOP_AllocSmall), |
| Label(L), Offset(Size) { } |
| MCWin64EHInstruction(OpType Op, MCSymbol *L, unsigned Reg, unsigned Off) |
| : Operation(Op), Label(L), Offset(Off), Register(Reg) { |
| assert(Op == Win64EH::UOP_SetFPReg || |
| Op == Win64EH::UOP_SaveNonVol || |
| Op == Win64EH::UOP_SaveNonVolBig || |
| Op == Win64EH::UOP_SaveXMM128 || |
| Op == Win64EH::UOP_SaveXMM128Big); |
| } |
| MCWin64EHInstruction(OpType Op, MCSymbol *L, bool Code) |
| : Operation(Op), Label(L), Offset(Code ? 1 : 0) { |
| assert(Op == Win64EH::UOP_PushMachFrame); |
| } |
| OpType getOperation() const { return Operation; } |
| MCSymbol *getLabel() const { return Label; } |
| unsigned getOffset() const { return Offset; } |
| unsigned getSize() const { return Offset; } |
| unsigned getRegister() const { return Register; } |
| bool isPushCodeFrame() const { return Offset == 1; } |
| }; |
| |
| struct MCWin64EHUnwindInfo { |
| MCWin64EHUnwindInfo() : Begin(0), End(0), ExceptionHandler(0), |
| Function(0), PrologEnd(0), Symbol(0), |
| HandlesUnwind(false), HandlesExceptions(false), |
| LastFrameInst(-1), ChainedParent(0), |
| Instructions() {} |
| MCSymbol *Begin; |
| MCSymbol *End; |
| const MCSymbol *ExceptionHandler; |
| const MCSymbol *Function; |
| MCSymbol *PrologEnd; |
| MCSymbol *Symbol; |
| bool HandlesUnwind; |
| bool HandlesExceptions; |
| int LastFrameInst; |
| MCWin64EHUnwindInfo *ChainedParent; |
| std::vector<MCWin64EHInstruction> Instructions; |
| }; |
| |
| class MCWin64EHUnwindEmitter { |
| public: |
| static StringRef GetSectionSuffix(const MCSymbol *func); |
| // |
| // This emits the unwind info sections (.pdata and .xdata in PE/COFF). |
| // |
| static void Emit(MCStreamer &streamer); |
| static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info); |
| }; |
| } // end namespace llvm |
| |
| #endif |