ec17c4f075
Add basis of CSKY MCTargetDesc and it's enough to compile and link but doesn't yet do anything particularly useful. Once an ASM parser and printer are added in the next two patches, the whole thing can be usefully tested. Differential Revision: https://reviews.llvm.org/D93372
72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
//===-- CSKYMCCodeEmitter.cpp - CSKY Code Emitter interface ---------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the CSKYMCCodeEmitter class.
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//
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//===----------------------------------------------------------------------===//
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#include "CSKYMCCodeEmitter.h"
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#include "MCTargetDesc/CSKYMCTargetDesc.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/MC/MCInstBuilder.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/Support/EndianStream.h"
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using namespace llvm;
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#define DEBUG_TYPE "csky-mccode-emitter"
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STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
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unsigned CSKYMCCodeEmitter::getOImmOpValue(const MCInst &MI, unsigned Idx,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(Idx);
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assert(MO.isImm() && "Unexpected MO type.");
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return MO.getImm() - 1;
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}
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void CSKYMCCodeEmitter::encodeInstruction(const MCInst &MI, raw_ostream &OS,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCInstrDesc &Desc = MII.get(MI.getOpcode());
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unsigned Size = Desc.getSize();
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uint32_t Bin = getBinaryCodeForInstr(MI, Fixups, STI);
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uint16_t LO16 = static_cast<uint16_t>(Bin);
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uint16_t HI16 = static_cast<uint16_t>(Bin >> 16);
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if (Size == 4)
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support::endian::write<uint16_t>(OS, HI16, support::little);
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support::endian::write<uint16_t>(OS, LO16, support::little);
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++MCNumEmitted; // Keep track of the # of mi's emitted.
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}
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unsigned
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CSKYMCCodeEmitter::getMachineOpValue(const MCInst &MI, const MCOperand &MO,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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if (MO.isReg())
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return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg());
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if (MO.isImm())
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return static_cast<unsigned>(MO.getImm());
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llvm_unreachable("Unhandled expression!");
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return 0;
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}
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MCCodeEmitter *llvm::createCSKYMCCodeEmitter(const MCInstrInfo &MCII,
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const MCRegisterInfo &MRI,
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MCContext &Ctx) {
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return new CSKYMCCodeEmitter(Ctx, MCII);
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}
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#include "CSKYGenMCCodeEmitter.inc"
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