1 //===-- AVRMCCodeEmitter.h - Convert AVR Code to Machine Code -------------===// 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 defines the AVRMCCodeEmitter class. 10 // 11 //===----------------------------------------------------------------------===// 12 // 13 14 #ifndef LLVM_AVR_CODE_EMITTER_H 15 #define LLVM_AVR_CODE_EMITTER_H 16 17 #include "AVRFixupKinds.h" 18 19 #include "llvm/MC/MCCodeEmitter.h" 20 #include "llvm/Support/DataTypes.h" 21 22 #define GET_INSTRINFO_OPERAND_TYPES_ENUM 23 #include "AVRGenInstrInfo.inc" 24 25 namespace llvm { 26 27 class MCContext; 28 class MCExpr; 29 class MCFixup; 30 class MCInst; 31 class MCInstrInfo; 32 class MCOperand; 33 class MCSubtargetInfo; 34 class raw_ostream; 35 36 /// Writes AVR machine code to a stream. 37 class AVRMCCodeEmitter : public MCCodeEmitter { 38 public: AVRMCCodeEmitter(const MCInstrInfo & MCII,MCContext & Ctx)39 AVRMCCodeEmitter(const MCInstrInfo &MCII, MCContext &Ctx) 40 : MCII(MCII), Ctx(Ctx) {} 41 42 private: 43 /// Finishes up encoding an LD/ST instruction. 44 /// The purpose of this function is to set an bit in the instruction 45 /// which follows no logical pattern. See the implementation for details. 46 unsigned loadStorePostEncoder(const MCInst &MI, unsigned EncodedValue, 47 const MCSubtargetInfo &STI) const; 48 49 /// Gets the encoding for a conditional branch target. 50 template <AVR::Fixups Fixup> 51 unsigned encodeRelCondBrTarget(const MCInst &MI, unsigned OpNo, 52 SmallVectorImpl<MCFixup> &Fixups, 53 const MCSubtargetInfo &STI) const; 54 55 /// Encodes the `PTRREGS` operand to a load or store instruction. 56 unsigned encodeLDSTPtrReg(const MCInst &MI, unsigned OpNo, 57 SmallVectorImpl<MCFixup> &Fixups, 58 const MCSubtargetInfo &STI) const; 59 60 /// Encodes a `register+immediate` operand for `LDD`/`STD`. 61 unsigned encodeMemri(const MCInst &MI, unsigned OpNo, 62 SmallVectorImpl<MCFixup> &Fixups, 63 const MCSubtargetInfo &STI) const; 64 65 /// Takes the complement of a number (~0 - val). 66 unsigned encodeComplement(const MCInst &MI, unsigned OpNo, 67 SmallVectorImpl<MCFixup> &Fixups, 68 const MCSubtargetInfo &STI) const; 69 70 /// Encodes an immediate value with a given fixup. 71 /// \tparam Offset The offset into the instruction for the fixup. 72 template <AVR::Fixups Fixup, unsigned Offset> 73 unsigned encodeImm(const MCInst &MI, unsigned OpNo, 74 SmallVectorImpl<MCFixup> &Fixups, 75 const MCSubtargetInfo &STI) const; 76 77 /// Gets the encoding of the target for the `CALL k` instruction. 78 unsigned encodeCallTarget(const MCInst &MI, unsigned OpNo, 79 SmallVectorImpl<MCFixup> &Fixups, 80 const MCSubtargetInfo &STI) const; 81 82 /// TableGen'ed function to get the binary encoding for an instruction. 83 uint64_t getBinaryCodeForInstr(const MCInst &MI, 84 SmallVectorImpl<MCFixup> &Fixups, 85 const MCSubtargetInfo &STI) const; 86 87 unsigned getExprOpValue(const MCExpr *Expr, SmallVectorImpl<MCFixup> &Fixups, 88 const MCSubtargetInfo &STI) const; 89 90 /// Returns the binary encoding of operand. 91 /// 92 /// If the machine operand requires relocation, the relocation is recorded 93 /// and zero is returned. 94 unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO, 95 SmallVectorImpl<MCFixup> &Fixups, 96 const MCSubtargetInfo &STI) const; 97 98 void encodeInstruction(const MCInst &MI, SmallVectorImpl<char> &CB, 99 SmallVectorImpl<MCFixup> &Fixups, 100 const MCSubtargetInfo &STI) const override; 101 102 AVRMCCodeEmitter(const AVRMCCodeEmitter &) = delete; 103 void operator=(const AVRMCCodeEmitter &) = delete; 104 105 const MCInstrInfo &MCII; 106 MCContext &Ctx; 107 }; 108 109 } // namespace llvm 110 111 #endif // LLVM_AVR_CODE_EMITTER_H 112