1 //===- ARCMCInstLower.cpp - ARC MachineInstr to MCInst ----------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 /// This file contains code to lower ARC MachineInstrs to their
11 /// corresponding MCInst records.
13 //===----------------------------------------------------------------------===//
15 #include "ARCMCInstLower.h"
16 #include "llvm/CodeGen/AsmPrinter.h"
17 #include "llvm/CodeGen/MachineFunction.h"
18 #include "llvm/CodeGen/MachineInstr.h"
19 #include "llvm/CodeGen/MachineOperand.h"
20 #include "llvm/MC/MCContext.h"
21 #include "llvm/MC/MCExpr.h"
22 #include "llvm/MC/MCInst.h"
26 ARCMCInstLower::ARCMCInstLower(MCContext *C, AsmPrinter &AsmPrinter)
27 : Ctx(C), Printer(AsmPrinter) {}
29 MCOperand ARCMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
30 MachineOperandType MOTy,
31 unsigned Offset) const {
32 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
33 const MCSymbol *Symbol;
36 case MachineOperand::MO_MachineBasicBlock:
37 Symbol = MO.getMBB()->getSymbol();
39 case MachineOperand::MO_GlobalAddress:
40 Symbol = Printer.getSymbol(MO.getGlobal());
41 Offset += MO.getOffset();
43 case MachineOperand::MO_BlockAddress:
44 Symbol = Printer.GetBlockAddressSymbol(MO.getBlockAddress());
45 Offset += MO.getOffset();
47 case MachineOperand::MO_ExternalSymbol:
48 Symbol = Printer.GetExternalSymbolSymbol(MO.getSymbolName());
49 Offset += MO.getOffset();
51 case MachineOperand::MO_JumpTableIndex:
52 Symbol = Printer.GetJTISymbol(MO.getIndex());
54 case MachineOperand::MO_ConstantPoolIndex:
55 Symbol = Printer.GetCPISymbol(MO.getIndex());
56 Offset += MO.getOffset();
59 llvm_unreachable("<unknown operand type>");
62 assert(Symbol && "Symbol creation failed.\n");
63 const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::create(Symbol, Kind, *Ctx);
66 return MCOperand::createExpr(MCSym);
68 // Assume offset is never negative.
71 const MCConstantExpr *OffsetExpr = MCConstantExpr::create(Offset, *Ctx);
72 const MCBinaryExpr *Add = MCBinaryExpr::createAdd(MCSym, OffsetExpr, *Ctx);
73 return MCOperand::createExpr(Add);
76 MCOperand ARCMCInstLower::LowerOperand(const MachineOperand &MO,
77 unsigned Offset) const {
78 MachineOperandType MOTy = MO.getType();
82 llvm_unreachable("unknown operand type");
83 case MachineOperand::MO_Register:
84 // Ignore all implicit register operands.
87 return MCOperand::createReg(MO.getReg());
88 case MachineOperand::MO_Immediate:
89 return MCOperand::createImm(MO.getImm() + Offset);
90 case MachineOperand::MO_MachineBasicBlock:
91 case MachineOperand::MO_GlobalAddress:
92 case MachineOperand::MO_ExternalSymbol:
93 case MachineOperand::MO_JumpTableIndex:
94 case MachineOperand::MO_ConstantPoolIndex:
95 case MachineOperand::MO_BlockAddress:
96 return LowerSymbolOperand(MO, MOTy, Offset);
97 case MachineOperand::MO_RegisterMask:
104 void ARCMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
105 OutMI.setOpcode(MI->getOpcode());
107 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
108 const MachineOperand &MO = MI->getOperand(i);
109 MCOperand MCOp = LowerOperand(MO);
112 OutMI.addOperand(MCOp);