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118 lines
3.8 KiB
C++
118 lines
3.8 KiB
C++
//===-- XCoreMCInstLower.cpp - Convert XCore MachineInstr to MCInst -------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief This file contains code to lower XCore MachineInstrs to their
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/// corresponding MCInst records.
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///
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//===----------------------------------------------------------------------===//
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#include "XCoreMCInstLower.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineOperand.h"
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#include "llvm/IR/Mangler.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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using namespace llvm;
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XCoreMCInstLower::XCoreMCInstLower(class AsmPrinter &asmprinter)
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: Printer(asmprinter) {}
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void XCoreMCInstLower::Initialize(Mangler *M, MCContext *C) {
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Mang = M;
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Ctx = C;
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}
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MCOperand XCoreMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
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MachineOperandType MOTy,
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unsigned Offset) const {
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MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
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const MCSymbol *Symbol;
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switch (MOTy) {
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case MachineOperand::MO_MachineBasicBlock:
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Symbol = MO.getMBB()->getSymbol();
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break;
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case MachineOperand::MO_GlobalAddress:
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Symbol = Printer.getSymbol(MO.getGlobal());
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Offset += MO.getOffset();
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break;
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case MachineOperand::MO_BlockAddress:
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Symbol = Printer.GetBlockAddressSymbol(MO.getBlockAddress());
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Offset += MO.getOffset();
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break;
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case MachineOperand::MO_ExternalSymbol:
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Symbol = Printer.GetExternalSymbolSymbol(MO.getSymbolName());
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Offset += MO.getOffset();
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break;
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case MachineOperand::MO_JumpTableIndex:
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Symbol = Printer.GetJTISymbol(MO.getIndex());
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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Symbol = Printer.GetCPISymbol(MO.getIndex());
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Offset += MO.getOffset();
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break;
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default:
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llvm_unreachable("<unknown operand type>");
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}
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const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::create(Symbol, Kind, *Ctx);
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if (!Offset)
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return MCOperand::createExpr(MCSym);
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// Assume offset is never negative.
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assert(Offset > 0);
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const MCConstantExpr *OffsetExpr = MCConstantExpr::create(Offset, *Ctx);
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const MCBinaryExpr *Add = MCBinaryExpr::createAdd(MCSym, OffsetExpr, *Ctx);
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return MCOperand::createExpr(Add);
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}
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MCOperand XCoreMCInstLower::LowerOperand(const MachineOperand &MO,
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unsigned offset) const {
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MachineOperandType MOTy = MO.getType();
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switch (MOTy) {
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default: 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()) break;
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return MCOperand::createReg(MO.getReg());
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case MachineOperand::MO_Immediate:
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return MCOperand::createImm(MO.getImm() + offset);
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case MachineOperand::MO_MachineBasicBlock:
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case MachineOperand::MO_GlobalAddress:
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case MachineOperand::MO_ExternalSymbol:
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case MachineOperand::MO_JumpTableIndex:
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case MachineOperand::MO_ConstantPoolIndex:
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case MachineOperand::MO_BlockAddress:
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return LowerSymbolOperand(MO, MOTy, offset);
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case MachineOperand::MO_RegisterMask:
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break;
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}
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return MCOperand();
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}
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void XCoreMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
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OutMI.setOpcode(MI->getOpcode());
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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const MachineOperand &MO = MI->getOperand(i);
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MCOperand MCOp = LowerOperand(MO);
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if (MCOp.isValid())
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OutMI.addOperand(MCOp);
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}
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}
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