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//===-- Nios2MCInstLower.cpp - Convert Nios2 MachineInstr to MCInst -------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains code to lower Nios2 MachineInstrs to their corresponding
// MCInst records.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/Nios2BaseInfo.h"
#include "MCTargetDesc/Nios2MCExpr.h"
#include "Nios2.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineOperand.h"
using namespace llvm;
static MCOperand LowerSymbolOperand(const MachineOperand &MO, AsmPrinter &AP) {
MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
Nios2MCExpr::Nios2ExprKind TargetKind = Nios2MCExpr::CEK_None;
const MCSymbol *Symbol;
switch (MO.getTargetFlags()) {
default:
llvm_unreachable("Invalid target flag!");
case Nios2FG::MO_NO_FLAG:
break;
case Nios2FG::MO_ABS_HI:
TargetKind = Nios2MCExpr::CEK_ABS_HI;
break;
case Nios2FG::MO_ABS_LO:
TargetKind = Nios2MCExpr::CEK_ABS_LO;
break;
}
switch (MO.getType()) {
case MachineOperand::MO_GlobalAddress:
Symbol = AP.getSymbol(MO.getGlobal());
break;
case MachineOperand::MO_MachineBasicBlock:
Symbol = MO.getMBB()->getSymbol();
break;
case MachineOperand::MO_BlockAddress:
Symbol = AP.GetBlockAddressSymbol(MO.getBlockAddress());
break;
case MachineOperand::MO_ExternalSymbol:
Symbol = AP.GetExternalSymbolSymbol(MO.getSymbolName());
break;
case MachineOperand::MO_JumpTableIndex:
Symbol = AP.GetJTISymbol(MO.getIndex());
break;
case MachineOperand::MO_ConstantPoolIndex:
Symbol = AP.GetCPISymbol(MO.getIndex());
break;
default:
llvm_unreachable("<unknown operand type>");
}
const MCExpr *Expr = MCSymbolRefExpr::create(Symbol, Kind, AP.OutContext);
if (TargetKind != Nios2MCExpr::CEK_None)
Expr = Nios2MCExpr::create(TargetKind, Expr, AP.OutContext);
return MCOperand::createExpr(Expr);
}
static MCOperand LowerOperand(const MachineOperand &MO, AsmPrinter &AP) {
switch (MO.getType()) {
default:
llvm_unreachable("unknown operand type");
case MachineOperand::MO_Register:
// Ignore all implicit register operands.
if (MO.isImplicit())
break;
return MCOperand::createReg(MO.getReg());
case MachineOperand::MO_Immediate:
return MCOperand::createImm(MO.getImm());
case MachineOperand::MO_MachineBasicBlock:
case MachineOperand::MO_ExternalSymbol:
case MachineOperand::MO_JumpTableIndex:
case MachineOperand::MO_BlockAddress:
case MachineOperand::MO_GlobalAddress:
case MachineOperand::MO_ConstantPoolIndex:
return LowerSymbolOperand(MO, AP);
case MachineOperand::MO_RegisterMask:
break;
}
return MCOperand();
}
void llvm::LowerNios2MachineInstToMCInst(const MachineInstr *MI, MCInst &OutMI,
AsmPrinter &AP) {
OutMI.setOpcode(MI->getOpcode());
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
MCOperand MCOp = LowerOperand(MO, AP);
if (MCOp.isValid())
OutMI.addOperand(MCOp);
}
}
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