diff options
Diffstat (limited to 'contrib/llvm/lib/Target/Mips/MipsMCInstLower.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/Mips/MipsMCInstLower.cpp | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/Mips/MipsMCInstLower.cpp b/contrib/llvm/lib/Target/Mips/MipsMCInstLower.cpp new file mode 100644 index 0000000..d4c5e6d --- /dev/null +++ b/contrib/llvm/lib/Target/Mips/MipsMCInstLower.cpp @@ -0,0 +1,191 @@ +//===-- 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 "MipsMCInstLower.h" +#include "MipsAsmPrinter.h" +#include "MipsInstrInfo.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(MipsAsmPrinter &asmprinter) + : AsmPrinter(asmprinter) {} + +void MipsMCInstLower::Initialize(Mangler *M, MCContext *C) { + Mang = M; + Ctx = C; +} + +MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO, + MachineOperandType MOTy, + unsigned Offset) const { + MCSymbolRefExpr::VariantKind Kind; + const MCSymbol *Symbol; + + switch(MO.getTargetFlags()) { + default: llvm_unreachable("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_GOT16: Kind = MCSymbolRefExpr::VK_Mips_GOT16; 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_TLSLDM: Kind = MCSymbolRefExpr::VK_Mips_TLSLDM; break; + case MipsII::MO_DTPREL_HI: Kind = MCSymbolRefExpr::VK_Mips_DTPREL_HI; break; + case MipsII::MO_DTPREL_LO: Kind = MCSymbolRefExpr::VK_Mips_DTPREL_LO; 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; + case MipsII::MO_HIGHER: Kind = MCSymbolRefExpr::VK_Mips_HIGHER; break; + case MipsII::MO_HIGHEST: Kind = MCSymbolRefExpr::VK_Mips_HIGHEST; break; + } + + switch (MOTy) { + case MachineOperand::MO_MachineBasicBlock: + Symbol = MO.getMBB()->getSymbol(); + break; + + case MachineOperand::MO_GlobalAddress: + Symbol = Mang->getSymbol(MO.getGlobal()); + Offset += MO.getOffset(); + break; + + case MachineOperand::MO_BlockAddress: + Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress()); + Offset += MO.getOffset(); + break; + + case MachineOperand::MO_ExternalSymbol: + Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName()); + Offset += MO.getOffset(); + break; + + case MachineOperand::MO_JumpTableIndex: + Symbol = AsmPrinter.GetJTISymbol(MO.getIndex()); + break; + + case MachineOperand::MO_ConstantPoolIndex: + Symbol = AsmPrinter.GetCPISymbol(MO.getIndex()); + 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 *Add = MCBinaryExpr::CreateAdd(MCSym, OffsetExpr, *Ctx); + return MCOperand::CreateExpr(Add); +} + +/* +static void CreateMCInst(MCInst& Inst, unsigned Opc, const MCOperand &Opnd0, + const MCOperand &Opnd1, + const MCOperand &Opnd2 = MCOperand()) { + Inst.setOpcode(Opc); + Inst.addOperand(Opnd0); + Inst.addOperand(Opnd1); + if (Opnd2.isValid()) + Inst.addOperand(Opnd2); +} +*/ + +MCOperand MipsMCInstLower::LowerOperand(const MachineOperand &MO, + unsigned offset) const { + MachineOperandType MOTy = MO.getType(); + + switch (MOTy) { + 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() + offset); + 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, offset); + case MachineOperand::MO_RegisterMask: + break; + } + + 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); + } +} + +// If the D<shift> instruction has a shift amount that is greater +// than 31 (checked in calling routine), lower it to a D<shift>32 instruction +void MipsMCInstLower::LowerLargeShift(const MachineInstr *MI, + MCInst& Inst, + int64_t Shift) { + // rt + Inst.addOperand(LowerOperand(MI->getOperand(0))); + // rd + Inst.addOperand(LowerOperand(MI->getOperand(1))); + // saminus32 + Inst.addOperand(MCOperand::CreateImm(Shift)); + + switch (MI->getOpcode()) { + default: + // Calling function is not synchronized + llvm_unreachable("Unexpected shift instruction"); + break; + case Mips::DSLL: + Inst.setOpcode(Mips::DSLL32); + break; + case Mips::DSRL: + Inst.setOpcode(Mips::DSRL32); + break; + case Mips::DSRA: + Inst.setOpcode(Mips::DSRA32); + break; + } +} |
