forked from OSchip/llvm-project
118 lines
3.3 KiB
C++
118 lines
3.3 KiB
C++
//===-- Nios2MCInstLower.cpp - Convert Nios2 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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// This file contains code to lower Nios2 MachineInstrs to their corresponding
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// MCInst records.
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//
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/Nios2BaseInfo.h"
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#include "MCTargetDesc/Nios2MCExpr.h"
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#include "Nios2.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineOperand.h"
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using namespace llvm;
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static MCOperand LowerSymbolOperand(const MachineOperand &MO, AsmPrinter &AP) {
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MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
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Nios2MCExpr::Nios2ExprKind TargetKind = Nios2MCExpr::CEK_None;
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const MCSymbol *Symbol;
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switch (MO.getTargetFlags()) {
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default:
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llvm_unreachable("Invalid target flag!");
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case Nios2FG::MO_NO_FLAG:
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break;
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case Nios2FG::MO_ABS_HI:
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TargetKind = Nios2MCExpr::CEK_ABS_HI;
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break;
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case Nios2FG::MO_ABS_LO:
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TargetKind = Nios2MCExpr::CEK_ABS_LO;
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break;
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}
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switch (MO.getType()) {
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case MachineOperand::MO_GlobalAddress:
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Symbol = AP.getSymbol(MO.getGlobal());
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break;
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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_BlockAddress:
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Symbol = AP.GetBlockAddressSymbol(MO.getBlockAddress());
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break;
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case MachineOperand::MO_ExternalSymbol:
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Symbol = AP.GetExternalSymbolSymbol(MO.getSymbolName());
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break;
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case MachineOperand::MO_JumpTableIndex:
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Symbol = AP.GetJTISymbol(MO.getIndex());
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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Symbol = AP.GetCPISymbol(MO.getIndex());
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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 MCExpr *Expr = MCSymbolRefExpr::create(Symbol, Kind, AP.OutContext);
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if (TargetKind != Nios2MCExpr::CEK_None)
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Expr = Nios2MCExpr::create(TargetKind, Expr, AP.OutContext);
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return MCOperand::createExpr(Expr);
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}
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static MCOperand LowerOperand(const MachineOperand &MO, AsmPrinter &AP) {
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switch (MO.getType()) {
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default:
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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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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());
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case MachineOperand::MO_MachineBasicBlock:
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case MachineOperand::MO_ExternalSymbol:
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case MachineOperand::MO_JumpTableIndex:
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case MachineOperand::MO_BlockAddress:
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case MachineOperand::MO_GlobalAddress:
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case MachineOperand::MO_ConstantPoolIndex:
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return LowerSymbolOperand(MO, AP);
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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 llvm::LowerNios2MachineInstToMCInst(const MachineInstr *MI, MCInst &OutMI,
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AsmPrinter &AP) {
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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, AP);
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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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