| //===-- AVRMCInstLower.cpp - Convert AVR MachineInstr to an MCInst --------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains code to lower AVR MachineInstrs to their corresponding |
| // MCInst records. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "AVRMCInstLower.h" |
| |
| #include "AVRInstrInfo.h" |
| #include "MCTargetDesc/AVRMCExpr.h" |
| |
| #include "llvm/CodeGen/AsmPrinter.h" |
| #include "llvm/IR/Mangler.h" |
| #include "llvm/MC/MCInst.h" |
| #include "llvm/Support/ErrorHandling.h" |
| |
| namespace llvm { |
| |
| MCOperand AVRMCInstLower::lowerSymbolOperand(const MachineOperand &MO, |
| MCSymbol *Sym) const { |
| unsigned char TF = MO.getTargetFlags(); |
| const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx); |
| |
| bool IsNegated = false; |
| if (TF & AVRII::MO_NEG) { |
| IsNegated = true; |
| } |
| |
| if (!MO.isJTI() && MO.getOffset()) { |
| Expr = MCBinaryExpr::createAdd( |
| Expr, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx); |
| } |
| |
| bool IsFunction = MO.isGlobal() && isa<Function>(MO.getGlobal()); |
| |
| if (TF & AVRII::MO_LO) { |
| if (IsFunction) { |
| // N.B. Should we use _GS fixups here to cope with >128k progmem? |
| Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_PM_LO8, Expr, IsNegated, Ctx); |
| } else { |
| Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_LO8, Expr, IsNegated, Ctx); |
| } |
| } else if (TF & AVRII::MO_HI) { |
| if (IsFunction) { |
| // N.B. Should we use _GS fixups here to cope with >128k progmem? |
| Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_PM_HI8, Expr, IsNegated, Ctx); |
| } else { |
| Expr = AVRMCExpr::create(AVRMCExpr::VK_AVR_HI8, Expr, IsNegated, Ctx); |
| } |
| } else if (TF != 0) { |
| llvm_unreachable("Unknown target flag on symbol operand"); |
| } |
| |
| return MCOperand::createExpr(Expr); |
| } |
| |
| void AVRMCInstLower::lowerInstruction(const MachineInstr &MI, |
| MCInst &OutMI) const { |
| OutMI.setOpcode(MI.getOpcode()); |
| |
| for (MachineOperand const &MO : MI.operands()) { |
| MCOperand MCOp; |
| |
| switch (MO.getType()) { |
| default: |
| MI.print(errs()); |
| 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_GlobalAddress: |
| MCOp = lowerSymbolOperand(MO, Printer.getSymbol(MO.getGlobal())); |
| break; |
| case MachineOperand::MO_ExternalSymbol: |
| MCOp = lowerSymbolOperand( |
| MO, Printer.GetExternalSymbolSymbol(MO.getSymbolName())); |
| break; |
| case MachineOperand::MO_MachineBasicBlock: |
| MCOp = MCOperand::createExpr( |
| MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), Ctx)); |
| break; |
| case MachineOperand::MO_RegisterMask: |
| continue; |
| case MachineOperand::MO_BlockAddress: |
| MCOp = lowerSymbolOperand( |
| MO, Printer.GetBlockAddressSymbol(MO.getBlockAddress())); |
| break; |
| case MachineOperand::MO_JumpTableIndex: |
| MCOp = lowerSymbolOperand(MO, Printer.GetJTISymbol(MO.getIndex())); |
| break; |
| case MachineOperand::MO_ConstantPoolIndex: |
| MCOp = lowerSymbolOperand(MO, Printer.GetCPISymbol(MO.getIndex())); |
| break; |
| } |
| |
| OutMI.addOperand(MCOp); |
| } |
| } |
| |
| } // end of namespace llvm |