1 | //===- llvm/MC/MCCodeEmitter.h - Instruction Encoding -----------*- 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_MCCODEEMITTER_H |
10 | #define LLVM_MC_MCCODEEMITTER_H |
11 | |
12 | namespace llvm { |
13 | |
14 | class MCFixup; |
15 | class MCInst; |
16 | class MCSubtargetInfo; |
17 | class raw_ostream; |
18 | template<typename T> class SmallVectorImpl; |
19 | |
20 | /// MCCodeEmitter - Generic instruction encoding interface. |
21 | class MCCodeEmitter { |
22 | protected: // Can only create subclasses. |
23 | MCCodeEmitter(); |
24 | |
25 | public: |
26 | MCCodeEmitter(const MCCodeEmitter &) = delete; |
27 | MCCodeEmitter &operator=(const MCCodeEmitter &) = delete; |
28 | virtual ~MCCodeEmitter(); |
29 | |
30 | /// Lifetime management |
31 | virtual void reset() {} |
32 | |
33 | /// Append the prefixes of given instruction to the code buffer. |
34 | /// |
35 | /// \param Inst a single low-level machine instruction. |
36 | /// \param CB code buffer |
37 | virtual void emitPrefix(const MCInst &Inst, SmallVectorImpl<char> &CB, |
38 | const MCSubtargetInfo &STI) const {} |
39 | /// Encode the given \p Inst to bytes and append to \p CB. |
40 | virtual void encodeInstruction(const MCInst &Inst, SmallVectorImpl<char> &CB, |
41 | SmallVectorImpl<MCFixup> &Fixups, |
42 | const MCSubtargetInfo &STI) const = 0; |
43 | }; |
44 | |
45 | } // end namespace llvm |
46 | |
47 | #endif // LLVM_MC_MCCODEEMITTER_H |
48 | |