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//===-- MipsMCInstLower.cpp - Convert Mips 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 Mips MachineInstrs to their corresponding
// MCInst records.
//
//===----------------------------------------------------------------------===//
#include "MipsAsmPrinter.h"
#include "MipsInstrInfo.h"
#include "MipsMCInstLower.h"
#include "MCTargetDesc/MipsBaseInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Target/Mangler.h"
using namespace llvm;
MipsMCInstLower::MipsMCInstLower(Mangler *mang, const MachineFunction &mf,
MipsAsmPrinter &asmprinter)
: Ctx(mf.getContext()), Mang(mang), AsmPrinter(asmprinter) {}
MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
MachineOperandType MOTy,
unsigned Offset) const {
MCSymbolRefExpr::VariantKind Kind;
const MCSymbol *Symbol;
switch(MO.getTargetFlags()) {
default: assert(0 && "Invalid target flag!");
case MipsII::MO_NO_FLAG: Kind = MCSymbolRefExpr::VK_None; break;
case MipsII::MO_GPREL: Kind = MCSymbolRefExpr::VK_Mips_GPREL; break;
case MipsII::MO_GOT_CALL: Kind = MCSymbolRefExpr::VK_Mips_GOT_CALL; break;
case MipsII::MO_GOT: Kind = MCSymbolRefExpr::VK_Mips_GOT; break;
case MipsII::MO_ABS_HI: Kind = MCSymbolRefExpr::VK_Mips_ABS_HI; break;
case MipsII::MO_ABS_LO: Kind = MCSymbolRefExpr::VK_Mips_ABS_LO; break;
case MipsII::MO_TLSGD: Kind = MCSymbolRefExpr::VK_Mips_TLSGD; break;
case MipsII::MO_GOTTPREL: Kind = MCSymbolRefExpr::VK_Mips_GOTTPREL; break;
case MipsII::MO_TPREL_HI: Kind = MCSymbolRefExpr::VK_Mips_TPREL_HI; break;
case MipsII::MO_TPREL_LO: Kind = MCSymbolRefExpr::VK_Mips_TPREL_LO; break;
case MipsII::MO_GPOFF_HI: Kind = MCSymbolRefExpr::VK_Mips_GPOFF_HI; break;
case MipsII::MO_GPOFF_LO: Kind = MCSymbolRefExpr::VK_Mips_GPOFF_LO; break;
case MipsII::MO_GOT_DISP: Kind = MCSymbolRefExpr::VK_Mips_GOT_DISP; break;
case MipsII::MO_GOT_PAGE: Kind = MCSymbolRefExpr::VK_Mips_GOT_PAGE; break;
case MipsII::MO_GOT_OFST: Kind = MCSymbolRefExpr::VK_Mips_GOT_OFST; break;
}
switch (MOTy) {
case MachineOperand::MO_MachineBasicBlock:
Symbol = MO.getMBB()->getSymbol();
break;
case MachineOperand::MO_GlobalAddress:
Symbol = Mang->getSymbol(MO.getGlobal());
break;
case MachineOperand::MO_BlockAddress:
Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
break;
case MachineOperand::MO_ExternalSymbol:
Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
break;
case MachineOperand::MO_JumpTableIndex:
Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
break;
case MachineOperand::MO_ConstantPoolIndex:
Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
if (MO.getOffset())
Offset += MO.getOffset();
break;
default:
llvm_unreachable("<unknown operand type>");
}
const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::Create(Symbol, Kind, Ctx);
if (!Offset)
return MCOperand::CreateExpr(MCSym);
// Assume offset is never negative.
assert(Offset > 0);
const MCConstantExpr *OffsetExpr = MCConstantExpr::Create(Offset, Ctx);
const MCBinaryExpr *AddExpr = MCBinaryExpr::CreateAdd(MCSym, OffsetExpr, Ctx);
return MCOperand::CreateExpr(AddExpr);
}
// Lower ".cpload $reg" to
// "lui $gp, %hi(_gp_disp)"
// "addiu $gp, $gp, %lo(_gp_disp)"
// "addu $gp. $gp, $reg"
void MipsMCInstLower::LowerCPLOAD(const MachineInstr *MI,
SmallVector<MCInst, 4>& MCInsts) {
MCInst Lui, Addiu, Addu;
StringRef SymName("_gp_disp");
const MCSymbol *Symbol = Ctx.GetOrCreateSymbol(SymName);
const MCSymbolRefExpr *MCSym;
// lui $gp, %hi(_gp_disp)
Lui.setOpcode(Mips::LUi);
Lui.addOperand(MCOperand::CreateReg(Mips::GP));
MCSym = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_Mips_ABS_HI, Ctx);
Lui.addOperand(MCOperand::CreateExpr(MCSym));
MCInsts.push_back(Lui);
// addiu $gp, $gp, %lo(_gp_disp)
Addiu.setOpcode(Mips::ADDiu);
Addiu.addOperand(MCOperand::CreateReg(Mips::GP));
Addiu.addOperand(MCOperand::CreateReg(Mips::GP));
MCSym = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_Mips_ABS_LO, Ctx);
Addiu.addOperand(MCOperand::CreateExpr(MCSym));
MCInsts.push_back(Addiu);
// addu $gp. $gp, $reg
Addu.setOpcode(Mips::ADDu);
Addu.addOperand(MCOperand::CreateReg(Mips::GP));
Addu.addOperand(MCOperand::CreateReg(Mips::GP));
const MachineOperand &MO = MI->getOperand(0);
assert(MO.isReg() && "CPLOAD's operand must be a register.");
Addu.addOperand(MCOperand::CreateReg(MO.getReg()));
MCInsts.push_back(Addu);
}
// Lower ".cprestore offset" to "sw $gp, offset($sp)".
void MipsMCInstLower::LowerCPRESTORE(const MachineInstr *MI, MCInst &OutMI) {
OutMI.clear();
OutMI.setOpcode(Mips::SW);
OutMI.addOperand(MCOperand::CreateReg(Mips::GP));
OutMI.addOperand(MCOperand::CreateReg(Mips::SP));
const MachineOperand &MO = MI->getOperand(0);
assert(MO.isImm() && "CPRESTORE's operand must be an immediate.");
OutMI.addOperand(MCOperand::CreateImm(MO.getImm()));
}
MCOperand MipsMCInstLower::LowerOperand(const MachineOperand& MO) const {
MachineOperandType MOTy = MO.getType();
switch (MOTy) {
default:
assert(0 && "unknown operand type");
break;
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_GlobalAddress:
case MachineOperand::MO_ExternalSymbol:
case MachineOperand::MO_JumpTableIndex:
case MachineOperand::MO_ConstantPoolIndex:
case MachineOperand::MO_BlockAddress:
return LowerSymbolOperand(MO, MOTy, 0);
}
return MCOperand();
}
void MipsMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
OutMI.setOpcode(MI->getOpcode());
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
MCOperand MCOp = LowerOperand(MO);
if (MCOp.isValid())
OutMI.addOperand(MCOp);
}
}
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