MipsMachineFunction.cpp revision 479a778590483bb3e2ca48537ed9eb7b15270ad6 
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
19using namespace llvm;
20
21static cl::opt<bool>
22FixGlobalBaseReg("mips-fix-global-base-reg", cl::Hidden, cl::init(true),
23                 cl::desc("Always use $gp as the global base register."));
24
25// class MipsCallEntry.
26MipsCallEntry::MipsCallEntry(const StringRef &N) {
27#ifndef NDEBUG
28  Name = N;
29  Val = 0;
30#endif
31}
32
33MipsCallEntry::MipsCallEntry(const GlobalValue *V) {
34#ifndef NDEBUG
35  Val = V;
36#endif
37}
38
39bool MipsCallEntry::isConstant(const MachineFrameInfo *) const {
40  return false;
41}
42
43bool MipsCallEntry::isAliased(const MachineFrameInfo *) const {
44  return false;
45}
46
47bool MipsCallEntry::mayAlias(const MachineFrameInfo *) const {
48  return false;
49}
50
51void MipsCallEntry::printCustom(raw_ostream &O) const {
52  O << "MipsCallEntry: ";
53#ifndef NDEBUG
54  if (Val)
55    O << Val->getName();
56  else
57    O << Name;
58#endif
59}
60
61MipsFunctionInfo::~MipsFunctionInfo() {
62  for (StringMap<const MipsCallEntry *>::iterator
63       I = ExternalCallEntries.begin(), E = ExternalCallEntries.end(); I != E;
64       ++I)
65    delete I->getValue();
66
67  for (ValueMap<const GlobalValue *, const MipsCallEntry *>::iterator
68       I = GlobalCallEntries.begin(), E = GlobalCallEntries.end(); I != E; ++I)
69    delete I->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  StringMap<const MipsCallEntry *>::const_iterator I;
124  I = ExternalCallEntries.find(Name);
125
126  if (I != ExternalCallEntries.end())
127    return MachinePointerInfo(I->getValue());
128
129  const MipsCallEntry *E = ExternalCallEntries[Name] = new MipsCallEntry(Name);
130  return MachinePointerInfo(E);
131}
132
133MachinePointerInfo MipsFunctionInfo::callPtrInfo(const GlobalValue *Val) {
134  ValueMap<const GlobalValue *, const MipsCallEntry *>::const_iterator I;
135  I = GlobalCallEntries.find(Val);
136
137  if (I != GlobalCallEntries.end())
138    return MachinePointerInfo(I->second);
139
140  const MipsCallEntry *E = GlobalCallEntries[Val] = new MipsCallEntry(Val);
141  return MachinePointerInfo(E);
142}
143
144void MipsFunctionInfo::anchor() { }
145