MipsMachineFunction.cpp revision 263508 
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 = 0;
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 (ValueMap<const GlobalValue *, const MipsCallEntry *>::iterator
69       I = GlobalCallEntries.begin(), E = GlobalCallEntries.end(); I != E; ++I)
70    delete I->second;
71}
72
73bool MipsFunctionInfo::globalBaseRegSet() const {
74  return GlobalBaseReg;
75}
76
77unsigned MipsFunctionInfo::getGlobalBaseReg() {
78  // Return if it has already been initialized.
79  if (GlobalBaseReg)
80    return GlobalBaseReg;
81
82  const MipsSubtarget &ST = MF.getTarget().getSubtarget<MipsSubtarget>();
83
84  const TargetRegisterClass *RC;
85  if (ST.inMips16Mode())
86    RC=(const TargetRegisterClass*)&Mips::CPU16RegsRegClass;
87  else
88    RC = ST.isABI_N64() ?
89      (const TargetRegisterClass*)&Mips::GPR64RegClass :
90      (const TargetRegisterClass*)&Mips::GPR32RegClass;
91  return GlobalBaseReg = MF.getRegInfo().createVirtualRegister(RC);
92}
93
94bool MipsFunctionInfo::mips16SPAliasRegSet() const {
95  return Mips16SPAliasReg;
96}
97unsigned MipsFunctionInfo::getMips16SPAliasReg() {
98  // Return if it has already been initialized.
99  if (Mips16SPAliasReg)
100    return Mips16SPAliasReg;
101
102  const TargetRegisterClass *RC;
103  RC=(const TargetRegisterClass*)&Mips::CPU16RegsRegClass;
104  return Mips16SPAliasReg = MF.getRegInfo().createVirtualRegister(RC);
105}
106
107void MipsFunctionInfo::createEhDataRegsFI() {
108  for (int I = 0; I < 4; ++I) {
109    const MipsSubtarget &ST = MF.getTarget().getSubtarget<MipsSubtarget>();
110    const TargetRegisterClass *RC = ST.isABI_N64() ?
111        &Mips::GPR64RegClass : &Mips::GPR32RegClass;
112
113    EhDataRegFI[I] = MF.getFrameInfo()->CreateStackObject(RC->getSize(),
114        RC->getAlignment(), false);
115  }
116}
117
118bool MipsFunctionInfo::isEhDataRegFI(int FI) const {
119  return CallsEhReturn && (FI == EhDataRegFI[0] || FI == EhDataRegFI[1]
120                        || FI == EhDataRegFI[2] || FI == EhDataRegFI[3]);
121}
122
123MachinePointerInfo MipsFunctionInfo::callPtrInfo(const StringRef &Name) {
124  const MipsCallEntry *&E = ExternalCallEntries[Name];
125
126  if (!E)
127    E = new MipsCallEntry(Name);
128
129  return MachinePointerInfo(E);
130}
131
132MachinePointerInfo MipsFunctionInfo::callPtrInfo(const GlobalValue *Val) {
133  const MipsCallEntry *&E = GlobalCallEntries[Val];
134
135  if (!E)
136    E = new MipsCallEntry(Val);
137
138  return MachinePointerInfo(E);
139}
140
141void MipsFunctionInfo::anchor() { }
142