82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
//=-- BPFMCInstLower.cpp - Convert BPF MachineInstr to an MCInst ------------=//
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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 contains code to lower BPF MachineInstrs to their corresponding
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// MCInst records.
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//
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//===----------------------------------------------------------------------===//
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#include "BPFMCInstLower.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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MCSymbol *
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BPFMCInstLower::GetGlobalAddressSymbol(const MachineOperand &MO) const {
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return Printer.getSymbol(MO.getGlobal());
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}
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MCSymbol *
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BPFMCInstLower::GetExternalSymbolSymbol(const MachineOperand &MO) const {
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return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
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}
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MCOperand BPFMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
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MCSymbol *Sym) const {
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const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);
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if (!MO.isJTI() && MO.getOffset())
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llvm_unreachable("unknown symbol op");
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return MCOperand::createExpr(Expr);
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}
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void BPFMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
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OutMI.setOpcode(MI->getOpcode());
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for (const MachineOperand &MO : MI->operands()) {
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MCOperand MCOp;
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switch (MO.getType()) {
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default:
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MI->print(errs());
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llvm_unreachable("unknown operand type");
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case MachineOperand::MO_Register:
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// Ignore all implicit register operands.
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if (MO.isImplicit())
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continue;
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MCOp = MCOperand::createReg(MO.getReg());
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break;
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case MachineOperand::MO_Immediate:
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MCOp = MCOperand::createImm(MO.getImm());
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break;
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case MachineOperand::MO_MachineBasicBlock:
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MCOp = MCOperand::createExpr(
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MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), Ctx));
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break;
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case MachineOperand::MO_RegisterMask:
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continue;
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case MachineOperand::MO_ExternalSymbol:
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MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
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break;
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case MachineOperand::MO_GlobalAddress:
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MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
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break;
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}
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OutMI.addOperand(MCOp);
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}
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}
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