1//===- HexagonMCInstLower.cpp - Convert Hexagon MachineInstr to an MCInst -===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file contains code to lower Hexagon MachineInstrs to their corresponding
11// MCInst records.
12//
13//===----------------------------------------------------------------------===//
14
15#include "Hexagon.h"
16#include "HexagonAsmPrinter.h"
17#include "HexagonMachineFunctionInfo.h"
18#include "llvm/Constants.h"
19#include "llvm/CodeGen/MachineBasicBlock.h"
20#include "llvm/MC/MCExpr.h"
21#include "llvm/MC/MCInst.h"
22#include "llvm/Target/Mangler.h"
23
24using namespace llvm;
25
26static MCOperand GetSymbolRef(const MachineOperand& MO, const MCSymbol* Symbol,
27                              HexagonAsmPrinter& Printer) {
28  MCContext &MC = Printer.OutContext;
29  const MCExpr *ME;
30
31  ME = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None, MC);
32
33  if (!MO.isJTI() && MO.getOffset())
34    ME = MCBinaryExpr::CreateAdd(ME, MCConstantExpr::Create(MO.getOffset(), MC),
35                                 MC);
36
37  return (MCOperand::CreateExpr(ME));
38}
39
40// Create an MCInst from a MachineInstr
41void llvm::HexagonLowerToMC(const MachineInstr* MI, MCInst& MCI,
42                            HexagonAsmPrinter& AP) {
43  MCI.setOpcode(MI->getOpcode());
44
45  for (unsigned i = 0, e = MI->getNumOperands(); i < e; i++) {
46    const MachineOperand &MO = MI->getOperand(i);
47    MCOperand MCO;
48
49    switch (MO.getType()) {
50    default:
51      MI->dump();
52      llvm_unreachable("unknown operand type");
53    case MachineOperand::MO_Register:
54      // Ignore all implicit register operands.
55      if (MO.isImplicit()) continue;
56      MCO = MCOperand::CreateReg(MO.getReg());
57      break;
58    case MachineOperand::MO_FPImmediate: {
59      APFloat Val = MO.getFPImm()->getValueAPF();
60      // FP immediates are used only when setting GPRs, so they may be dealt
61      // with like regular immediates from this point on.
62      MCO = MCOperand::CreateImm(*Val.bitcastToAPInt().getRawData());
63      break;
64    }
65    case MachineOperand::MO_Immediate:
66      MCO = MCOperand::CreateImm(MO.getImm());
67      break;
68    case MachineOperand::MO_MachineBasicBlock:
69      MCO = MCOperand::CreateExpr
70              (MCSymbolRefExpr::Create(MO.getMBB()->getSymbol(),
71               AP.OutContext));
72      break;
73    case MachineOperand::MO_GlobalAddress:
74      MCO = GetSymbolRef(MO, AP.Mang->getSymbol(MO.getGlobal()), AP);
75      break;
76    case MachineOperand::MO_ExternalSymbol:
77      MCO = GetSymbolRef(MO, AP.GetExternalSymbolSymbol(MO.getSymbolName()),
78                         AP);
79      break;
80    case MachineOperand::MO_JumpTableIndex:
81      MCO = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP);
82      break;
83    case MachineOperand::MO_ConstantPoolIndex:
84      MCO = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP);
85      break;
86    case MachineOperand::MO_BlockAddress:
87      MCO = GetSymbolRef(MO, AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP);
88      break;
89    }
90
91    MCI.addOperand(MCO);
92  }
93}
94