1//===-- MSP430MCInstLower.cpp - Convert MSP430 MachineInstr to an 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 MSP430 MachineInstrs to their corresponding
10// MCInst records.
11//
12//===----------------------------------------------------------------------===//
13
14#include "MSP430MCInstLower.h"
15#include "llvm/ADT/SmallString.h"
16#include "llvm/CodeGen/AsmPrinter.h"
17#include "llvm/CodeGen/MachineBasicBlock.h"
18#include "llvm/CodeGen/MachineInstr.h"
19#include "llvm/IR/DataLayout.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#include "llvm/Support/ErrorHandling.h"
26#include "llvm/Support/raw_ostream.h"
27#include "llvm/Target/TargetMachine.h"
28using namespace llvm;
29
30MCSymbol *MSP430MCInstLower::
31GetGlobalAddressSymbol(const MachineOperand &MO) const {
32  switch (MO.getTargetFlags()) {
33  default: llvm_unreachable("Unknown target flag on GV operand");
34  case 0: break;
35  }
36
37  return Printer.getSymbol(MO.getGlobal());
38}
39
40MCSymbol *MSP430MCInstLower::
41GetExternalSymbolSymbol(const MachineOperand &MO) const {
42  switch (MO.getTargetFlags()) {
43  default: llvm_unreachable("Unknown target flag on GV operand");
44  case 0: break;
45  }
46
47  return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
48}
49
50MCSymbol *MSP430MCInstLower::
51GetJumpTableSymbol(const MachineOperand &MO) const {
52  const DataLayout &DL = Printer.getDataLayout();
53  SmallString<256> Name;
54  raw_svector_ostream(Name) << DL.getPrivateGlobalPrefix() << "JTI"
55                            << Printer.getFunctionNumber() << '_'
56                            << MO.getIndex();
57
58  switch (MO.getTargetFlags()) {
59  default: llvm_unreachable("Unknown target flag on GV operand");
60  case 0: break;
61  }
62
63  // Create a symbol for the name.
64  return Ctx.getOrCreateSymbol(Name);
65}
66
67MCSymbol *MSP430MCInstLower::
68GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
69  const DataLayout &DL = Printer.getDataLayout();
70  SmallString<256> Name;
71  raw_svector_ostream(Name) << DL.getPrivateGlobalPrefix() << "CPI"
72                            << Printer.getFunctionNumber() << '_'
73                            << MO.getIndex();
74
75  switch (MO.getTargetFlags()) {
76  default: llvm_unreachable("Unknown target flag on GV operand");
77  case 0: break;
78  }
79
80  // Create a symbol for the name.
81  return Ctx.getOrCreateSymbol(Name);
82}
83
84MCSymbol *MSP430MCInstLower::
85GetBlockAddressSymbol(const MachineOperand &MO) const {
86  switch (MO.getTargetFlags()) {
87  default: llvm_unreachable("Unknown target flag on GV operand");
88  case 0: break;
89  }
90
91  return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
92}
93
94MCOperand MSP430MCInstLower::
95LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
96  // FIXME: We would like an efficient form for this, so we don't have to do a
97  // lot of extra uniquing.
98  const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);
99
100  switch (MO.getTargetFlags()) {
101  default: llvm_unreachable("Unknown target flag on GV operand");
102  case 0: break;
103  }
104
105  if (!MO.isJTI() && MO.getOffset())
106    Expr = MCBinaryExpr::createAdd(Expr,
107                                   MCConstantExpr::create(MO.getOffset(), Ctx),
108                                   Ctx);
109  return MCOperand::createExpr(Expr);
110}
111
112#define GET_REGINFO_ENUM
113#include "MSP430GenRegisterInfo.inc"
114
115void MSP430MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
116  OutMI.setOpcode(MI->getOpcode());
117
118  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
119    const MachineOperand &MO = MI->getOperand(i);
120
121    MCOperand MCOp;
122    switch (MO.getType()) {
123    default:
124      MI->print(errs());
125      llvm_unreachable("unknown operand type");
126    case MachineOperand::MO_Register:
127      // Ignore all implicit register operands.
128      if (MO.isImplicit()) continue;
129      MCOp = MCOperand::createReg(MO.getReg());
130      break;
131    case MachineOperand::MO_Immediate:
132      MCOp = MCOperand::createImm(MO.getImm());
133      break;
134    case MachineOperand::MO_MachineBasicBlock:
135      MCOp = MCOperand::createExpr(MCSymbolRefExpr::create(
136                         MO.getMBB()->getSymbol(), Ctx));
137      break;
138    case MachineOperand::MO_GlobalAddress:
139      MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
140      break;
141    case MachineOperand::MO_ExternalSymbol:
142      MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
143      break;
144    case MachineOperand::MO_JumpTableIndex:
145      MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
146      break;
147    case MachineOperand::MO_ConstantPoolIndex:
148      MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
149      break;
150    case MachineOperand::MO_BlockAddress:
151      MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
152      break;
153    case MachineOperand::MO_RegisterMask:
154      continue;
155    }
156
157    OutMI.addOperand(MCOp);
158  }
159}
160