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assembler such as shifts greater than 32. In the case of direct object, the code gen needs to do this lowering since the assembler is not involved. With the advent of the llvm-mc assembler, it also needs to do the same lowering. This patch makes that specific lowering code accessible to both the direct object output and the assembler. This patch does not affect generated output. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163287 91177308-0d34-0410-b5e6-96231b3b80d8
163 lines
5.7 KiB
C++
163 lines
5.7 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 "MCTargetDesc/MipsBaseInfo.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/MCExpr.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(MipsAsmPrinter &asmprinter)
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: AsmPrinter(asmprinter) {}
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void MipsMCInstLower::Initialize(Mangler *M, MCContext *C) {
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Mang = M;
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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;
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const MCSymbol *Symbol;
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switch(MO.getTargetFlags()) {
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default: llvm_unreachable("Invalid target flag!");
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case MipsII::MO_NO_FLAG: Kind = MCSymbolRefExpr::VK_None; break;
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case MipsII::MO_GPREL: Kind = MCSymbolRefExpr::VK_Mips_GPREL; break;
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case MipsII::MO_GOT_CALL: Kind = MCSymbolRefExpr::VK_Mips_GOT_CALL; break;
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case MipsII::MO_GOT16: Kind = MCSymbolRefExpr::VK_Mips_GOT16; break;
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case MipsII::MO_GOT: Kind = MCSymbolRefExpr::VK_Mips_GOT; break;
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case MipsII::MO_ABS_HI: Kind = MCSymbolRefExpr::VK_Mips_ABS_HI; break;
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case MipsII::MO_ABS_LO: Kind = MCSymbolRefExpr::VK_Mips_ABS_LO; break;
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case MipsII::MO_TLSGD: Kind = MCSymbolRefExpr::VK_Mips_TLSGD; break;
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case MipsII::MO_TLSLDM: Kind = MCSymbolRefExpr::VK_Mips_TLSLDM; break;
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case MipsII::MO_DTPREL_HI: Kind = MCSymbolRefExpr::VK_Mips_DTPREL_HI; break;
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case MipsII::MO_DTPREL_LO: Kind = MCSymbolRefExpr::VK_Mips_DTPREL_LO; break;
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case MipsII::MO_GOTTPREL: Kind = MCSymbolRefExpr::VK_Mips_GOTTPREL; break;
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case MipsII::MO_TPREL_HI: Kind = MCSymbolRefExpr::VK_Mips_TPREL_HI; break;
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case MipsII::MO_TPREL_LO: Kind = MCSymbolRefExpr::VK_Mips_TPREL_LO; break;
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case MipsII::MO_GPOFF_HI: Kind = MCSymbolRefExpr::VK_Mips_GPOFF_HI; break;
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case MipsII::MO_GPOFF_LO: Kind = MCSymbolRefExpr::VK_Mips_GPOFF_LO; break;
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case MipsII::MO_GOT_DISP: Kind = MCSymbolRefExpr::VK_Mips_GOT_DISP; break;
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case MipsII::MO_GOT_PAGE: Kind = MCSymbolRefExpr::VK_Mips_GOT_PAGE; break;
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case MipsII::MO_GOT_OFST: Kind = MCSymbolRefExpr::VK_Mips_GOT_OFST; break;
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case MipsII::MO_HIGHER: Kind = MCSymbolRefExpr::VK_Mips_HIGHER; break;
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case MipsII::MO_HIGHEST: Kind = MCSymbolRefExpr::VK_Mips_HIGHEST; 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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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_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 MCSymbolRefExpr *MCSym = MCSymbolRefExpr::Create(Symbol, Kind, *Ctx);
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if (!Offset)
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return MCOperand::CreateExpr(MCSym);
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// Assume offset is never negative.
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assert(Offset > 0);
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const MCConstantExpr *OffsetExpr = MCConstantExpr::Create(Offset, *Ctx);
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const MCBinaryExpr *Add = MCBinaryExpr::CreateAdd(MCSym, OffsetExpr, *Ctx);
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return MCOperand::CreateExpr(Add);
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}
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/*
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static void CreateMCInst(MCInst& Inst, unsigned Opc, const MCOperand &Opnd0,
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const MCOperand &Opnd1,
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const MCOperand &Opnd2 = MCOperand()) {
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Inst.setOpcode(Opc);
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Inst.addOperand(Opnd0);
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Inst.addOperand(Opnd1);
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if (Opnd2.isValid())
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Inst.addOperand(Opnd2);
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}
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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_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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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 = 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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