forked from OSchip/llvm-project
119 lines
4.1 KiB
C++
119 lines
4.1 KiB
C++
//===-- MipsMCInstLower.cpp - Convert Mips 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 Mips MachineInstrs to their corresponding
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// MCInst records.
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//
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//===----------------------------------------------------------------------===//
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#include "MipsMCInstLower.h"
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#include "MipsAsmPrinter.h"
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#include "MipsInstrInfo.h"
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#include "MipsMCSymbolRefExpr.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/MC/MCContext.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/Target/Mangler.h"
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using namespace llvm;
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MipsMCInstLower::MipsMCInstLower(Mangler *mang, const MachineFunction &mf,
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MipsAsmPrinter &asmprinter)
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: Ctx(mf.getContext()), Mang(mang), AsmPrinter(asmprinter) {}
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MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
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MachineOperandType MOTy) const {
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MipsMCSymbolRefExpr::VariantKind Kind;
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const MCSymbol *Symbol;
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int Offset = 0;
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switch(MO.getTargetFlags()) {
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default: assert(0 && "Invalid target flag!");
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case MipsII::MO_NO_FLAG: Kind = MipsMCSymbolRefExpr::VK_Mips_None; break;
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case MipsII::MO_GPREL: Kind = MipsMCSymbolRefExpr::VK_Mips_GPREL; break;
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case MipsII::MO_GOT_CALL: Kind = MipsMCSymbolRefExpr::VK_Mips_GOT_CALL; break;
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case MipsII::MO_GOT: Kind = MipsMCSymbolRefExpr::VK_Mips_GOT; break;
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case MipsII::MO_ABS_HI: Kind = MipsMCSymbolRefExpr::VK_Mips_ABS_HI; break;
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case MipsII::MO_ABS_LO: Kind = MipsMCSymbolRefExpr::VK_Mips_ABS_LO; break;
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case MipsII::MO_TLSGD: Kind = MipsMCSymbolRefExpr::VK_Mips_TLSGD; break;
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case MipsII::MO_GOTTPREL: Kind = MipsMCSymbolRefExpr::VK_Mips_GOTTPREL; break;
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case MipsII::MO_TPREL_HI: Kind = MipsMCSymbolRefExpr::VK_Mips_TPREL_HI; break;
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case MipsII::MO_TPREL_LO: Kind = MipsMCSymbolRefExpr::VK_Mips_TPREL_LO; break;
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}
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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 = Mang->getSymbol(MO.getGlobal());
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break;
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case MachineOperand::MO_BlockAddress:
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Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
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break;
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case MachineOperand::MO_ExternalSymbol:
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Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
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break;
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case MachineOperand::MO_JumpTableIndex:
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Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
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if (MO.getOffset())
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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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return MCOperand::CreateExpr(MipsMCSymbolRefExpr::Create(Kind, Symbol, Offset,
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Ctx));
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}
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void MipsMCInstLower::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;
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MachineOperandType MOTy = MO.getType();
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switch (MOTy) {
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default:
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MI->dump();
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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()) 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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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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MCOp = LowerSymbolOperand(MO, MOTy);
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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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