MipsMachineFunction.cpp revision dce4a407a24b04eebc6a376f8e62b41aaa7b071f 
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 "MipsMachineFunction.h"
11#include "MCTargetDesc/MipsBaseInfo.h"
12#include "MipsInstrInfo.h"
13#include "MipsSubtarget.h"
14#include "llvm/CodeGen/MachineInstrBuilder.h"
15#include "llvm/CodeGen/MachineRegisterInfo.h"
16#include "llvm/IR/Function.h"
17#include "llvm/Support/CommandLine.h"
18#include "llvm/Support/raw_ostream.h"
19
20using namespace llvm;
21
22static cl::opt<bool>
23FixGlobalBaseReg("mips-fix-global-base-reg", cl::Hidden, cl::init(true),
24                 cl::desc("Always use $gp as the global base register."));
25
26// class MipsCallEntry.
27MipsCallEntry::MipsCallEntry(const StringRef &N) {
28#ifndef NDEBUG
29  Name = N;
30  Val = nullptr;
31#endif
32}
33
34MipsCallEntry::MipsCallEntry(const GlobalValue *V) {
35#ifndef NDEBUG
36  Val = V;
37#endif
38}
39
40bool MipsCallEntry::isConstant(const MachineFrameInfo *) const {
41  return false;
42}
43
44bool MipsCallEntry::isAliased(const MachineFrameInfo *) const {
45  return false;
46}
47
48bool MipsCallEntry::mayAlias(const MachineFrameInfo *) const {
49  return false;
50}
51
52void MipsCallEntry::printCustom(raw_ostream &O) const {
53  O << "MipsCallEntry: ";
54#ifndef NDEBUG
55  if (Val)
56    O << Val->getName();
57  else
58    O << Name;
59#endif
60}
61
62MipsFunctionInfo::~MipsFunctionInfo() {
63  for (StringMap<const MipsCallEntry *>::iterator
64       I = ExternalCallEntries.begin(), E = ExternalCallEntries.end(); I != E;
65       ++I)
66    delete I->getValue();
67
68  for (const auto &Entry : GlobalCallEntries)
69    delete Entry.second;
70}
71
72bool MipsFunctionInfo::globalBaseRegSet() const {
73  return GlobalBaseReg;
74}
75
76unsigned MipsFunctionInfo::getGlobalBaseReg() {
77  // Return if it has already been initialized.
78  if (GlobalBaseReg)
79    return GlobalBaseReg;
80
81  const MipsSubtarget &ST = MF.getTarget().getSubtarget<MipsSubtarget>();
82
83  const TargetRegisterClass *RC;
84  if (ST.inMips16Mode())
85    RC=(const TargetRegisterClass*)&Mips::CPU16RegsRegClass;
86  else
87    RC = ST.isABI_N64() ?
88      (const TargetRegisterClass*)&Mips::GPR64RegClass :
89      (const TargetRegisterClass*)&Mips::GPR32RegClass;
90  return GlobalBaseReg = MF.getRegInfo().createVirtualRegister(RC);
91}
92
93bool MipsFunctionInfo::mips16SPAliasRegSet() const {
94  return Mips16SPAliasReg;
95}
96unsigned MipsFunctionInfo::getMips16SPAliasReg() {
97  // Return if it has already been initialized.
98  if (Mips16SPAliasReg)
99    return Mips16SPAliasReg;
100
101  const TargetRegisterClass *RC;
102  RC=(const TargetRegisterClass*)&Mips::CPU16RegsRegClass;
103  return Mips16SPAliasReg = MF.getRegInfo().createVirtualRegister(RC);
104}
105
106void MipsFunctionInfo::createEhDataRegsFI() {
107  for (int I = 0; I < 4; ++I) {
108    const MipsSubtarget &ST = MF.getTarget().getSubtarget<MipsSubtarget>();
109    const TargetRegisterClass *RC = ST.isABI_N64() ?
110        &Mips::GPR64RegClass : &Mips::GPR32RegClass;
111
112    EhDataRegFI[I] = MF.getFrameInfo()->CreateStackObject(RC->getSize(),
113        RC->getAlignment(), false);
114  }
115}
116
117bool MipsFunctionInfo::isEhDataRegFI(int FI) const {
118  return CallsEhReturn && (FI == EhDataRegFI[0] || FI == EhDataRegFI[1]
119                        || FI == EhDataRegFI[2] || FI == EhDataRegFI[3]);
120}
121
122MachinePointerInfo MipsFunctionInfo::callPtrInfo(const StringRef &Name) {
123  const MipsCallEntry *&E = ExternalCallEntries[Name];
124
125  if (!E)
126    E = new MipsCallEntry(Name);
127
128  return MachinePointerInfo(E);
129}
130
131MachinePointerInfo MipsFunctionInfo::callPtrInfo(const GlobalValue *Val) {
132  const MipsCallEntry *&E = GlobalCallEntries[Val];
133
134  if (!E)
135    E = new MipsCallEntry(Val);
136
137  return MachinePointerInfo(E);
138}
139
140void MipsFunctionInfo::anchor() { }
141