1//===-- MipsMachineFunctionInfo.cpp - Private data used for Mips ----------===//
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#include "MCTargetDesc/MipsBaseInfo.h"
11#include "MipsInstrInfo.h"
12#include "MipsMachineFunction.h"
13#include "MipsSubtarget.h"
14#include "MipsTargetMachine.h"
15#include "llvm/CodeGen/MachineInstrBuilder.h"
16#include "llvm/CodeGen/MachineRegisterInfo.h"
17#include "llvm/IR/Function.h"
18#include "llvm/Support/CommandLine.h"
19#include "llvm/Support/raw_ostream.h"
20
21using namespace llvm;
22
23static cl::opt<bool>
24FixGlobalBaseReg("mips-fix-global-base-reg", cl::Hidden, cl::init(true),
25                 cl::desc("Always use $gp as the global base register."));
26
27// class MipsCallEntry.
28MipsCallEntry::MipsCallEntry(StringRef N) {
29#ifndef NDEBUG
30  Name = N;
31  Val = nullptr;
32#endif
33}
34
35MipsCallEntry::MipsCallEntry(const GlobalValue *V) {
36#ifndef NDEBUG
37  Val = V;
38#endif
39}
40
41bool MipsCallEntry::isConstant(const MachineFrameInfo *) const {
42  return false;
43}
44
45bool MipsCallEntry::isAliased(const MachineFrameInfo *) const {
46  return false;
47}
48
49bool MipsCallEntry::mayAlias(const MachineFrameInfo *) const {
50  return false;
51}
52
53void MipsCallEntry::printCustom(raw_ostream &O) const {
54  O << "MipsCallEntry: ";
55#ifndef NDEBUG
56  if (Val)
57    O << Val->getName();
58  else
59    O << Name;
60#endif
61}
62
63MipsFunctionInfo::~MipsFunctionInfo() {}
64
65bool MipsFunctionInfo::globalBaseRegSet() const {
66  return GlobalBaseReg;
67}
68
69unsigned MipsFunctionInfo::getGlobalBaseReg() {
70  // Return if it has already been initialized.
71  if (GlobalBaseReg)
72    return GlobalBaseReg;
73
74  MipsSubtarget const &STI =
75      static_cast<const MipsSubtarget &>(MF.getSubtarget());
76
77  const TargetRegisterClass *RC =
78      STI.inMips16Mode()
79          ? &Mips::CPU16RegsRegClass
80          : STI.inMicroMipsMode()
81                ? &Mips::GPRMM16RegClass
82                : static_cast<const MipsTargetMachine &>(MF.getTarget())
83                          .getABI()
84                          .IsN64()
85                      ? &Mips::GPR64RegClass
86                      : &Mips::GPR32RegClass;
87  return GlobalBaseReg = MF.getRegInfo().createVirtualRegister(RC);
88}
89
90bool MipsFunctionInfo::mips16SPAliasRegSet() const {
91  return Mips16SPAliasReg;
92}
93unsigned MipsFunctionInfo::getMips16SPAliasReg() {
94  // Return if it has already been initialized.
95  if (Mips16SPAliasReg)
96    return Mips16SPAliasReg;
97
98  const TargetRegisterClass *RC = &Mips::CPU16RegsRegClass;
99  return Mips16SPAliasReg = MF.getRegInfo().createVirtualRegister(RC);
100}
101
102void MipsFunctionInfo::createEhDataRegsFI() {
103  for (int I = 0; I < 4; ++I) {
104    const TargetRegisterClass *RC =
105        static_cast<const MipsTargetMachine &>(MF.getTarget()).getABI().IsN64()
106            ? &Mips::GPR64RegClass
107            : &Mips::GPR32RegClass;
108
109    EhDataRegFI[I] = MF.getFrameInfo()->CreateStackObject(RC->getSize(),
110        RC->getAlignment(), false);
111  }
112}
113
114bool MipsFunctionInfo::isEhDataRegFI(int FI) const {
115  return CallsEhReturn && (FI == EhDataRegFI[0] || FI == EhDataRegFI[1]
116                        || FI == EhDataRegFI[2] || FI == EhDataRegFI[3]);
117}
118
119MachinePointerInfo MipsFunctionInfo::callPtrInfo(StringRef Name) {
120  std::unique_ptr<const MipsCallEntry> &E = ExternalCallEntries[Name];
121
122  if (!E)
123    E = llvm::make_unique<MipsCallEntry>(Name);
124
125  return MachinePointerInfo(E.get());
126}
127
128MachinePointerInfo MipsFunctionInfo::callPtrInfo(const GlobalValue *Val) {
129  std::unique_ptr<const MipsCallEntry> &E = GlobalCallEntries[Val];
130
131  if (!E)
132    E = llvm::make_unique<MipsCallEntry>(Val);
133
134  return MachinePointerInfo(E.get());
135}
136
137int MipsFunctionInfo::getMoveF64ViaSpillFI(const TargetRegisterClass *RC) {
138  if (MoveF64ViaSpillFI == -1) {
139    MoveF64ViaSpillFI = MF.getFrameInfo()->CreateStackObject(
140        RC->getSize(), RC->getAlignment(), false);
141  }
142  return MoveF64ViaSpillFI;
143}
144
145void MipsFunctionInfo::anchor() { }
146