//===-- MSP430MCInstLower.cpp - Convert MSP430 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 MSP430 MachineInstrs to their corresponding // MCInst records. // //===----------------------------------------------------------------------===// #include "MSP430MCInstLower.h" #include "llvm/ADT/SmallString.h" #include "llvm/CodeGen/AsmPrinter.h" #include "llvm/CodeGen/MachineBasicBlock.h" #include "llvm/CodeGen/MachineInstr.h" #include "llvm/IR/DataLayout.h" #include "llvm/IR/Mangler.h" #include "llvm/MC/MCAsmInfo.h" #include "llvm/MC/MCContext.h" #include "llvm/MC/MCExpr.h" #include "llvm/MC/MCInst.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/raw_ostream.h" #include "llvm/Target/TargetMachine.h" using namespace llvm; MCSymbol *MSP430MCInstLower:: GetGlobalAddressSymbol(const MachineOperand &MO) const { switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on GV operand"); case 0: break; } return Printer.getSymbol(MO.getGlobal()); } MCSymbol *MSP430MCInstLower:: 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 *MSP430MCInstLower:: GetJumpTableSymbol(const MachineOperand &MO) const { const DataLayout *DL = Printer.TM.getDataLayout(); SmallString<256> Name; raw_svector_ostream(Name) << DL->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); } MCSymbol *MSP430MCInstLower:: GetConstantPoolIndexSymbol(const MachineOperand &MO) const { const DataLayout *DL = Printer.TM.getDataLayout(); SmallString<256> Name; raw_svector_ostream(Name) << DL->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); } MCSymbol *MSP430MCInstLower:: 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 MSP430MCInstLower:: 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 MSP430MCInstLower::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: MI->dump(); 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_RegisterMask: continue; } OutMI.addOperand(MCOp); } }