1//===-- VEMCInstLower.cpp - Convert VE MachineInstr to MCInst -------------===//
2//
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
6//
7//===----------------------------------------------------------------------===//
8//
9// This file contains code to lower VE MachineInstrs to their corresponding
10// MCInst records.
11//
12//===----------------------------------------------------------------------===//
13
14#include "MCTargetDesc/VEMCExpr.h"
15#include "VE.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/IR/Mangler.h"
21#include "llvm/MC/MCAsmInfo.h"
22#include "llvm/MC/MCContext.h"
23#include "llvm/MC/MCExpr.h"
24#include "llvm/MC/MCInst.h"
25
26using namespace llvm;
27
28static MCOperand LowerSymbolOperand(const MachineInstr *MI,
29                                    const MachineOperand &MO,
30                                    const MCSymbol *Symbol, AsmPrinter &AP) {
31  VEMCExpr::VariantKind Kind = (VEMCExpr::VariantKind)MO.getTargetFlags();
32
33  const MCExpr *Expr = MCSymbolRefExpr::create(Symbol, AP.OutContext);
34  // Add offset iff MO is not jump table info or machine basic block.
35  if (!MO.isJTI() && !MO.isMBB() && MO.getOffset())
36    Expr = MCBinaryExpr::createAdd(
37        Expr, MCConstantExpr::create(MO.getOffset(), AP.OutContext),
38        AP.OutContext);
39  Expr = VEMCExpr::create(Kind, Expr, AP.OutContext);
40  return MCOperand::createExpr(Expr);
41}
42
43static MCOperand LowerOperand(const MachineInstr *MI, const MachineOperand &MO,
44                              AsmPrinter &AP) {
45  switch (MO.getType()) {
46  default:
47    report_fatal_error("unsupported operand type");
48
49  case MachineOperand::MO_Register:
50    if (MO.isImplicit())
51      break;
52    return MCOperand::createReg(MO.getReg());
53
54  case MachineOperand::MO_ExternalSymbol:
55    return LowerSymbolOperand(
56        MI, MO, AP.GetExternalSymbolSymbol(MO.getSymbolName()), AP);
57  case MachineOperand::MO_GlobalAddress:
58    return LowerSymbolOperand(MI, MO, AP.getSymbol(MO.getGlobal()), AP);
59  case MachineOperand::MO_Immediate:
60    return MCOperand::createImm(MO.getImm());
61
62  case MachineOperand::MO_MachineBasicBlock:
63    return LowerSymbolOperand(MI, MO, MO.getMBB()->getSymbol(), AP);
64
65  case MachineOperand::MO_RegisterMask:
66    break;
67  }
68  return MCOperand();
69}
70
71void llvm::LowerVEMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
72                                       AsmPrinter &AP) {
73  OutMI.setOpcode(MI->getOpcode());
74
75  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
76    const MachineOperand &MO = MI->getOperand(i);
77    MCOperand MCOp = LowerOperand(MI, MO, AP);
78
79    if (MCOp.isValid())
80      OutMI.addOperand(MCOp);
81  }
82}
83