1 //===- MCWin64EH.h - Machine Code Win64 EH 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 // This file contains declarations to support the Win64 Exception Handling
10 // scheme in MC.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_MC_MCWIN64EH_H
15 #define LLVM_MC_MCWIN64EH_H
16 
17 #include "llvm/MC/MCWinEH.h"
18 #include "llvm/Support/Win64EH.h"
19 
20 namespace llvm {
21 class MCStreamer;
22 class MCSymbol;
23 
24 namespace Win64EH {
25 struct Instruction {
PushNonVolInstruction26   static WinEH::Instruction PushNonVol(MCSymbol *L, unsigned Reg) {
27     return WinEH::Instruction(Win64EH::UOP_PushNonVol, L, Reg, -1);
28   }
AllocInstruction29   static WinEH::Instruction Alloc(MCSymbol *L, unsigned Size) {
30     return WinEH::Instruction(Size > 128 ? UOP_AllocLarge : UOP_AllocSmall, L,
31                               -1, Size);
32   }
PushMachFrameInstruction33   static WinEH::Instruction PushMachFrame(MCSymbol *L, bool Code) {
34     return WinEH::Instruction(UOP_PushMachFrame, L, -1, Code ? 1 : 0);
35   }
SaveNonVolInstruction36   static WinEH::Instruction SaveNonVol(MCSymbol *L, unsigned Reg,
37                                        unsigned Offset) {
38     return WinEH::Instruction(Offset > 512 * 1024 - 8 ? UOP_SaveNonVolBig
39                                                       : UOP_SaveNonVol,
40                               L, Reg, Offset);
41   }
SaveXMMInstruction42   static WinEH::Instruction SaveXMM(MCSymbol *L, unsigned Reg,
43                                     unsigned Offset) {
44     return WinEH::Instruction(Offset > 512 * 1024 - 8 ? UOP_SaveXMM128Big
45                                                       : UOP_SaveXMM128,
46                               L, Reg, Offset);
47   }
SetFPRegInstruction48   static WinEH::Instruction SetFPReg(MCSymbol *L, unsigned Reg, unsigned Off) {
49     return WinEH::Instruction(UOP_SetFPReg, L, Reg, Off);
50   }
51 };
52 
53 class UnwindEmitter : public WinEH::UnwindEmitter {
54 public:
55   void Emit(MCStreamer &Streamer) const override;
56   void EmitUnwindInfo(MCStreamer &Streamer, WinEH::FrameInfo *FI,
57                       bool HandlerData) const override;
58 };
59 
60 class ARM64UnwindEmitter : public WinEH::UnwindEmitter {
61 public:
62   void Emit(MCStreamer &Streamer) const override;
63   void EmitUnwindInfo(MCStreamer &Streamer, WinEH::FrameInfo *FI,
64                       bool HandlerData) const override;
65 };
66 
67 }
68 } // end namespace llvm
69 
70 #endif
71