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external/llvm/lib/Target/Mips/MipsMCInstLower.cpp
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external/llvm/lib/Target/Mips/MipsMCInstLower.cpp
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//===- 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 "MCTargetDesc/MipsBaseInfo.h"
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#include "MCTargetDesc/MipsMCExpr.h"
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#include "MipsAsmPrinter.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/CodeGen/MachineOperand.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 <cassert>
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using namespace llvm;
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MipsMCInstLower::MipsMCInstLower(MipsAsmPrinter &asmprinter)
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: AsmPrinter(asmprinter) {}
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void MipsMCInstLower::Initialize(MCContext *C) {
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Ctx = C;
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}
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MCOperand MipsMCInstLower::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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MipsMCExpr::MipsExprKind TargetKind = MipsMCExpr::MEK_None;
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bool IsGpOff = false;
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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 MipsII::MO_NO_FLAG:
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break;
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case MipsII::MO_GPREL:
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TargetKind = MipsMCExpr::MEK_GPREL;
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break;
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case MipsII::MO_GOT_CALL:
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TargetKind = MipsMCExpr::MEK_GOT_CALL;
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break;
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case MipsII::MO_GOT:
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TargetKind = MipsMCExpr::MEK_GOT;
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break;
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case MipsII::MO_ABS_HI:
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TargetKind = MipsMCExpr::MEK_HI;
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break;
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case MipsII::MO_ABS_LO:
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TargetKind = MipsMCExpr::MEK_LO;
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break;
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case MipsII::MO_TLSGD:
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TargetKind = MipsMCExpr::MEK_TLSGD;
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break;
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case MipsII::MO_TLSLDM:
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TargetKind = MipsMCExpr::MEK_TLSLDM;
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break;
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case MipsII::MO_DTPREL_HI:
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TargetKind = MipsMCExpr::MEK_DTPREL_HI;
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break;
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case MipsII::MO_DTPREL_LO:
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TargetKind = MipsMCExpr::MEK_DTPREL_LO;
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break;
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case MipsII::MO_GOTTPREL:
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TargetKind = MipsMCExpr::MEK_GOTTPREL;
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break;
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case MipsII::MO_TPREL_HI:
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TargetKind = MipsMCExpr::MEK_TPREL_HI;
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break;
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case MipsII::MO_TPREL_LO:
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TargetKind = MipsMCExpr::MEK_TPREL_LO;
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break;
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case MipsII::MO_GPOFF_HI:
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TargetKind = MipsMCExpr::MEK_HI;
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IsGpOff = true;
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break;
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case MipsII::MO_GPOFF_LO:
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TargetKind = MipsMCExpr::MEK_LO;
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IsGpOff = true;
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break;
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case MipsII::MO_GOT_DISP:
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TargetKind = MipsMCExpr::MEK_GOT_DISP;
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break;
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case MipsII::MO_GOT_HI16:
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TargetKind = MipsMCExpr::MEK_GOT_HI16;
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break;
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case MipsII::MO_GOT_LO16:
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TargetKind = MipsMCExpr::MEK_GOT_LO16;
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break;
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case MipsII::MO_GOT_PAGE:
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TargetKind = MipsMCExpr::MEK_GOT_PAGE;
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break;
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case MipsII::MO_GOT_OFST:
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TargetKind = MipsMCExpr::MEK_GOT_OFST;
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break;
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case MipsII::MO_HIGHER:
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TargetKind = MipsMCExpr::MEK_HIGHER;
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break;
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case MipsII::MO_HIGHEST:
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TargetKind = MipsMCExpr::MEK_HIGHEST;
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break;
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case MipsII::MO_CALL_HI16:
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TargetKind = MipsMCExpr::MEK_CALL_HI16;
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break;
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case MipsII::MO_CALL_LO16:
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TargetKind = MipsMCExpr::MEK_CALL_LO16;
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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 = AsmPrinter.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 = AsmPrinter.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 = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
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Offset += MO.getOffset();
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break;
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case MachineOperand::MO_MCSymbol:
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Symbol = MO.getMCSymbol();
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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 = 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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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 MCExpr *Expr = MCSymbolRefExpr::create(Symbol, Kind, *Ctx);
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if (Offset) {
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// Assume offset is never negative.
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assert(Offset > 0);
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Expr = MCBinaryExpr::createAdd(Expr, MCConstantExpr::create(Offset, *Ctx),
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*Ctx);
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}
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if (IsGpOff)
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Expr = MipsMCExpr::createGpOff(TargetKind, Expr, *Ctx);
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else if (TargetKind != MipsMCExpr::MEK_None)
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Expr = MipsMCExpr::create(TargetKind, Expr, *Ctx);
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return MCOperand::createExpr(Expr);
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}
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MCOperand MipsMCInstLower::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_MCSymbol:
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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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MCOperand MipsMCInstLower::createSub(MachineBasicBlock *BB1,
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MachineBasicBlock *BB2,
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MipsMCExpr::MipsExprKind Kind) const {
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const MCSymbolRefExpr *Sym1 = MCSymbolRefExpr::create(BB1->getSymbol(), *Ctx);
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const MCSymbolRefExpr *Sym2 = MCSymbolRefExpr::create(BB2->getSymbol(), *Ctx);
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const MCBinaryExpr *Sub = MCBinaryExpr::createSub(Sym1, Sym2, *Ctx);
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return MCOperand::createExpr(MipsMCExpr::create(Kind, Sub, *Ctx));
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}
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void MipsMCInstLower::
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lowerLongBranchLUi(const MachineInstr *MI, MCInst &OutMI) const {
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OutMI.setOpcode(Mips::LUi);
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// Lower register operand.
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OutMI.addOperand(LowerOperand(MI->getOperand(0)));
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// Create %hi($tgt-$baltgt).
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OutMI.addOperand(createSub(MI->getOperand(1).getMBB(),
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MI->getOperand(2).getMBB(),
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MipsMCExpr::MEK_HI));
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}
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void MipsMCInstLower::lowerLongBranchADDiu(
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const MachineInstr *MI, MCInst &OutMI, int Opcode,
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MipsMCExpr::MipsExprKind Kind) const {
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OutMI.setOpcode(Opcode);
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// Lower two register operands.
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for (unsigned I = 0, E = 2; I != E; ++I) {
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const MachineOperand &MO = MI->getOperand(I);
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OutMI.addOperand(LowerOperand(MO));
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}
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// Create %lo($tgt-$baltgt) or %hi($tgt-$baltgt).
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OutMI.addOperand(createSub(MI->getOperand(2).getMBB(),
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MI->getOperand(3).getMBB(), Kind));
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}
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bool MipsMCInstLower::lowerLongBranch(const MachineInstr *MI,
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MCInst &OutMI) const {
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switch (MI->getOpcode()) {
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default:
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return false;
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case Mips::LONG_BRANCH_LUi:
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lowerLongBranchLUi(MI, OutMI);
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return true;
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case Mips::LONG_BRANCH_ADDiu:
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lowerLongBranchADDiu(MI, OutMI, Mips::ADDiu, MipsMCExpr::MEK_LO);
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return true;
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case Mips::LONG_BRANCH_DADDiu:
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unsigned TargetFlags = MI->getOperand(2).getTargetFlags();
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if (TargetFlags == MipsII::MO_ABS_HI)
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lowerLongBranchADDiu(MI, OutMI, Mips::DADDiu, MipsMCExpr::MEK_HI);
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else if (TargetFlags == MipsII::MO_ABS_LO)
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lowerLongBranchADDiu(MI, OutMI, Mips::DADDiu, MipsMCExpr::MEK_LO);
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else
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report_fatal_error("Unexpected flags for LONG_BRANCH_DADDiu");
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return true;
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}
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}
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void MipsMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
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if (lowerLongBranch(MI, OutMI))
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return;
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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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