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annotate lib/Target/Mips/MipsTargetObjectFile.cpp @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 60c9769439b8
children 7d135dc70f03
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1 //===-- MipsTargetObjectFile.cpp - Mips Object Files ----------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #include "MipsTargetObjectFile.h"
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11 #include "MipsSubtarget.h"
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12 #include "MipsTargetMachine.h"
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13 #include "llvm/IR/DataLayout.h"
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14 #include "llvm/IR/DerivedTypes.h"
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15 #include "llvm/IR/GlobalVariable.h"
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16 #include "llvm/MC/MCContext.h"
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17 #include "llvm/MC/MCSectionELF.h"
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18 #include "llvm/Support/CommandLine.h"
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19 #include "llvm/Support/ELF.h"
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20 #include "llvm/Target/TargetMachine.h"
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21 using namespace llvm;
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22
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23 static cl::opt<unsigned>
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24 SSThreshold("mips-ssection-threshold", cl::Hidden,
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25 cl::desc("Small data and bss section threshold size (default=8)"),
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26 cl::init(8));
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27
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28 static cl::opt<bool>
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29 LocalSData("mlocal-sdata", cl::Hidden,
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30 cl::desc("MIPS: Use gp_rel for object-local data."),
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31 cl::init(true));
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32
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33 static cl::opt<bool>
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34 ExternSData("mextern-sdata", cl::Hidden,
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35 cl::desc("MIPS: Use gp_rel for data that is not defined by the "
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36 "current object."),
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37 cl::init(true));
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38
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39 void MipsTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){
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40 TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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41 InitializeELF(TM.Options.UseInitArray);
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42
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43 SmallDataSection = getContext().getELFSection(
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44 ".sdata", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
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45
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46 SmallBSSSection = getContext().getELFSection(".sbss", ELF::SHT_NOBITS,
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47 ELF::SHF_WRITE | ELF::SHF_ALLOC);
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48 this->TM = &static_cast<const MipsTargetMachine &>(TM);
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49 }
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50
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51 // A address must be loaded from a small section if its size is less than the
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52 // small section size threshold. Data in this section must be addressed using
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53 // gp_rel operator.
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54 static bool IsInSmallSection(uint64_t Size) {
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55 // gcc has traditionally not treated zero-sized objects as small data, so this
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56 // is effectively part of the ABI.
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57 return Size > 0 && Size <= SSThreshold;
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58 }
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59
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60 /// Return true if this global address should be placed into small data/bss
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61 /// section.
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62 bool MipsTargetObjectFile::
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63 IsGlobalInSmallSection(const GlobalValue *GV, const TargetMachine &TM) const {
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64 // We first check the case where global is a declaration, because finding
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65 // section kind using getKindForGlobal() is only allowed for global
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66 // definitions.
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67 if (GV->isDeclaration() || GV->hasAvailableExternallyLinkage())
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68 return IsGlobalInSmallSectionImpl(GV, TM);
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69
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70 return IsGlobalInSmallSection(GV, TM, getKindForGlobal(GV, TM));
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71 }
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72
83
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73 /// Return true if this global address should be placed into small data/bss
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74 /// section.
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75 bool MipsTargetObjectFile::
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76 IsGlobalInSmallSection(const GlobalValue *GV, const TargetMachine &TM,
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77 SectionKind Kind) const {
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78 return (IsGlobalInSmallSectionImpl(GV, TM) &&
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79 (Kind.isDataRel() || Kind.isBSS() || Kind.isCommon()));
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80 }
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81
83
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82 /// Return true if this global address should be placed into small data/bss
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83 /// section. This method does all the work, except for checking the section
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84 /// kind.
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85 bool MipsTargetObjectFile::
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86 IsGlobalInSmallSectionImpl(const GlobalValue *GV,
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87 const TargetMachine &TM) const {
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88 const MipsSubtarget &Subtarget =
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89 *static_cast<const MipsTargetMachine &>(TM).getSubtargetImpl();
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90
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91 // Return if small section is not available.
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92 if (!Subtarget.useSmallSection())
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93 return false;
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94
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95 // Only global variables, not functions.
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96 const GlobalVariable *GVA = dyn_cast<GlobalVariable>(GV);
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97 if (!GVA)
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98 return false;
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99
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100 // Enforce -mlocal-sdata.
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101 if (!LocalSData && GV->hasLocalLinkage())
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102 return false;
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103
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104 // Enforce -mextern-sdata.
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105 if (!ExternSData && ((GV->hasExternalLinkage() && GV->isDeclaration()) ||
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106 GV->hasCommonLinkage()))
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107 return false;
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108
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109 Type *Ty = GV->getType()->getElementType();
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110 return IsInSmallSection(
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111 GV->getParent()->getDataLayout().getTypeAllocSize(Ty));
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112 }
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113
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114 MCSection *
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115 MipsTargetObjectFile::SelectSectionForGlobal(const GlobalValue *GV,
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116 SectionKind Kind, Mangler &Mang,
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117 const TargetMachine &TM) const {
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118 // TODO: Could also support "weak" symbols as well with ".gnu.linkonce.s.*"
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119 // sections?
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120
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121 // Handle Small Section classification here.
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122 if (Kind.isBSS() && IsGlobalInSmallSection(GV, TM, Kind))
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123 return SmallBSSSection;
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124 if (Kind.isDataRel() && IsGlobalInSmallSection(GV, TM, Kind))
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125 return SmallDataSection;
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126
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127 // Otherwise, we work the same as ELF.
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128 return TargetLoweringObjectFileELF::SelectSectionForGlobal(GV, Kind, Mang,TM);
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129 }
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130
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131 /// Return true if this constant should be placed into small data section.
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132 bool MipsTargetObjectFile::IsConstantInSmallSection(
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133 const DataLayout &DL, const Constant *CN, const TargetMachine &TM) const {
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134 return (static_cast<const MipsTargetMachine &>(TM)
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135 .getSubtargetImpl()
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136 ->useSmallSection() &&
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137 LocalSData && IsInSmallSection(DL.getTypeAllocSize(CN->getType())));
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138 }
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139
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140 /// Return true if this constant should be placed into small data section.
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141 MCSection *MipsTargetObjectFile::getSectionForConstant(
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142 const DataLayout &DL, SectionKind Kind, const Constant *C) const {
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143 if (IsConstantInSmallSection(DL, C, *TM))
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144 return SmallDataSection;
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145
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146 // Otherwise, we work the same as ELF.
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147 return TargetLoweringObjectFileELF::getSectionForConstant(DL, Kind, C);
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148 }