/3rd_party/llvm/lib/Target/MBlaze/MBlazeMCInstLower.cpp
https://code.google.com/p/softart/ · C++ · 167 lines · 127 code · 22 blank · 18 comment · 12 complexity · 799718b1136889007225cc09b88d5928 MD5 · raw file
- //===-- MBlazeMCInstLower.cpp - Convert MBlaze MachineInstr to an 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 MBlaze MachineInstrs to their corresponding
- // MCInst records.
- //
- //===----------------------------------------------------------------------===//
- #include "MBlazeMCInstLower.h"
- #include "MBlazeInstrInfo.h"
- #include "llvm/Constants.h"
- #include "llvm/CodeGen/AsmPrinter.h"
- #include "llvm/CodeGen/MachineBasicBlock.h"
- #include "llvm/CodeGen/MachineInstr.h"
- #include "llvm/MC/MCAsmInfo.h"
- #include "llvm/MC/MCContext.h"
- #include "llvm/MC/MCExpr.h"
- #include "llvm/MC/MCInst.h"
- #include "llvm/Target/Mangler.h"
- #include "llvm/Support/Debug.h"
- #include "llvm/Support/raw_ostream.h"
- #include "llvm/Support/ErrorHandling.h"
- #include "llvm/ADT/SmallString.h"
- using namespace llvm;
- MCSymbol *MBlazeMCInstLower::
- GetGlobalAddressSymbol(const MachineOperand &MO) const {
- switch (MO.getTargetFlags()) {
- default: llvm_unreachable("Unknown target flag on GV operand");
- case 0: break;
- }
- return Printer.Mang->getSymbol(MO.getGlobal());
- }
- MCSymbol *MBlazeMCInstLower::
- GetExternalSymbolSymbol(const MachineOperand &MO) const {
- switch (MO.getTargetFlags()) {
- default: llvm_unreachable("Unknown target flag on GV operand");
- case 0: break;
- }
- return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
- }
- MCSymbol *MBlazeMCInstLower::
- GetJumpTableSymbol(const MachineOperand &MO) const {
- SmallString<256> Name;
- raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
- << Printer.getFunctionNumber() << '_'
- << MO.getIndex();
- switch (MO.getTargetFlags()) {
- default: llvm_unreachable("Unknown target flag on GV operand");
- case 0: break;
- }
- // Create a symbol for the name.
- return Ctx.GetOrCreateSymbol(Name.str());
- }
- MCSymbol *MBlazeMCInstLower::
- GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
- SmallString<256> Name;
- raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
- << Printer.getFunctionNumber() << '_'
- << MO.getIndex();
- switch (MO.getTargetFlags()) {
- default:
- llvm_unreachable("Unknown target flag on GV operand");
- case 0: break;
- }
- // Create a symbol for the name.
- return Ctx.GetOrCreateSymbol(Name.str());
- }
- MCSymbol *MBlazeMCInstLower::
- GetBlockAddressSymbol(const MachineOperand &MO) const {
- switch (MO.getTargetFlags()) {
- default: llvm_unreachable("Unknown target flag on GV operand");
- case 0: break;
- }
- return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
- }
- MCOperand MBlazeMCInstLower::
- LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
- // FIXME: We would like an efficient form for this, so we don't have to do a
- // lot of extra uniquing.
- const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
- switch (MO.getTargetFlags()) {
- default:
- llvm_unreachable("Unknown target flag on GV operand");
- case 0: break;
- }
- if (!MO.isJTI() && MO.getOffset())
- Expr = MCBinaryExpr::CreateAdd(Expr,
- MCConstantExpr::Create(MO.getOffset(), Ctx),
- Ctx);
- return MCOperand::CreateExpr(Expr);
- }
- void MBlazeMCInstLower::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;
- switch (MO.getType()) {
- default: llvm_unreachable("unknown operand type");
- case MachineOperand::MO_Register:
- // Ignore all implicit register operands.
- if (MO.isImplicit()) continue;
- MCOp = MCOperand::CreateReg(MO.getReg());
- break;
- case MachineOperand::MO_Immediate:
- MCOp = MCOperand::CreateImm(MO.getImm());
- break;
- case MachineOperand::MO_MachineBasicBlock:
- MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
- MO.getMBB()->getSymbol(), Ctx));
- break;
- case MachineOperand::MO_GlobalAddress:
- MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
- break;
- case MachineOperand::MO_ExternalSymbol:
- MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
- break;
- case MachineOperand::MO_JumpTableIndex:
- MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
- break;
- case MachineOperand::MO_ConstantPoolIndex:
- MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
- break;
- case MachineOperand::MO_BlockAddress:
- MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
- break;
- case MachineOperand::MO_FPImmediate: {
- bool ignored;
- APFloat FVal = MO.getFPImm()->getValueAPF();
- FVal.convert(APFloat::IEEEsingle, APFloat::rmTowardZero, &ignored);
- APInt IVal = FVal.bitcastToAPInt();
- uint64_t Val = *IVal.getRawData();
- MCOp = MCOperand::CreateImm(Val);
- break;
- }
- case MachineOperand::MO_RegisterMask:
- continue;
- }
- OutMI.addOperand(MCOp);
- }
- }