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1 //===-- HexagonTargetObjectFile.cpp ---------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file contains the declarations of the HexagonTargetAsmInfo properties.
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #define DEBUG_TYPE "hexagon-sdata"
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14
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15 #include "HexagonTargetObjectFile.h"
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16 #include "llvm/ADT/SmallString.h"
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17 #include "llvm/ADT/StringRef.h"
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18 #include "llvm/ADT/Twine.h"
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19 #include "llvm/BinaryFormat/ELF.h"
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20 #include "llvm/IR/DataLayout.h"
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21 #include "llvm/IR/DerivedTypes.h"
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22 #include "llvm/IR/GlobalObject.h"
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23 #include "llvm/IR/GlobalValue.h"
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24 #include "llvm/IR/GlobalVariable.h"
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25 #include "llvm/IR/Type.h"
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26 #include "llvm/MC/MCContext.h"
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27 #include "llvm/MC/SectionKind.h"
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28 #include "llvm/Support/Casting.h"
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29 #include "llvm/Support/CommandLine.h"
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30 #include "llvm/Support/Debug.h"
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31 #include "llvm/Support/raw_ostream.h"
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32 #include "llvm/Target/TargetMachine.h"
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33
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34 using namespace llvm;
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35
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36 static cl::opt<unsigned> SmallDataThreshold("hexagon-small-data-threshold",
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37 cl::init(8), cl::Hidden,
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38 cl::desc("The maximum size of an object in the sdata section"));
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39
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40 static cl::opt<bool> NoSmallDataSorting("mno-sort-sda", cl::init(false),
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41 cl::Hidden, cl::desc("Disable small data sections sorting"));
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42
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43 static cl::opt<bool> StaticsInSData("hexagon-statics-in-small-data",
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44 cl::init(false), cl::Hidden, cl::ZeroOrMore,
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45 cl::desc("Allow static variables in .sdata"));
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46
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47 static cl::opt<bool> TraceGVPlacement("trace-gv-placement",
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48 cl::Hidden, cl::init(false),
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49 cl::desc("Trace global value placement"));
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50
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51 static cl::opt<bool>
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52 EmitJtInText("hexagon-emit-jt-text", cl::Hidden, cl::init(false),
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53 cl::desc("Emit hexagon jump tables in function section"));
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54
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55 static cl::opt<bool>
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56 EmitLutInText("hexagon-emit-lut-text", cl::Hidden, cl::init(false),
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57 cl::desc("Emit hexagon lookup tables in function section"));
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58
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59 // TraceGVPlacement controls messages for all builds. For builds with assertions
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60 // (debug or release), messages are also controlled by the usual debug flags
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61 // (e.g. -debug and -debug-only=globallayout)
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62 #define TRACE_TO(s, X) s << X
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63 #ifdef NDEBUG
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64 #define TRACE(X) \
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65 do { \
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66 if (TraceGVPlacement) { \
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67 TRACE_TO(errs(), X); \
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68 } \
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69 } while (false)
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70 #else
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71 #define TRACE(X) \
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72 do { \
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73 if (TraceGVPlacement) { \
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74 TRACE_TO(errs(), X); \
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75 } else { \
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76 LLVM_DEBUG(TRACE_TO(dbgs(), X)); \
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77 } \
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78 } while (false)
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79 #endif
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80
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81 // Returns true if the section name is such that the symbol will be put
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82 // in a small data section.
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83 // For instance, global variables with section attributes such as ".sdata"
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84 // ".sdata.*", ".sbss", and ".sbss.*" will go into small data.
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85 static bool isSmallDataSection(StringRef Sec) {
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86 // sectionName is either ".sdata" or ".sbss". Looking for an exact match
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87 // obviates the need for checks for section names such as ".sdatafoo".
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88 if (Sec.equals(".sdata") || Sec.equals(".sbss") || Sec.equals(".scommon"))
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89 return true;
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90 // If either ".sdata." or ".sbss." is a substring of the section name
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91 // then put the symbol in small data.
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92 return Sec.find(".sdata.") != StringRef::npos ||
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93 Sec.find(".sbss.") != StringRef::npos ||
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94 Sec.find(".scommon.") != StringRef::npos;
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95 }
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96
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97 static const char *getSectionSuffixForSize(unsigned Size) {
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98 switch (Size) {
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99 default:
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100 return "";
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101 case 1:
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102 return ".1";
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103 case 2:
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104 return ".2";
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105 case 4:
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106 return ".4";
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107 case 8:
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108 return ".8";
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109 }
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110 }
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111
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112 void HexagonTargetObjectFile::Initialize(MCContext &Ctx,
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113 const TargetMachine &TM) {
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114 TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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115 InitializeELF(TM.Options.UseInitArray);
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116
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117 SmallDataSection =
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118 getContext().getELFSection(".sdata", ELF::SHT_PROGBITS,
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119 ELF::SHF_WRITE | ELF::SHF_ALLOC |
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120 ELF::SHF_HEX_GPREL);
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121 SmallBSSSection =
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122 getContext().getELFSection(".sbss", ELF::SHT_NOBITS,
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123 ELF::SHF_WRITE | ELF::SHF_ALLOC |
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124 ELF::SHF_HEX_GPREL);
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125 }
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126
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127 MCSection *HexagonTargetObjectFile::SelectSectionForGlobal(
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128 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
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129 TRACE("[SelectSectionForGlobal] GO(" << GO->getName() << ") ");
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130 TRACE("input section(" << GO->getSection() << ") ");
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131
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132 TRACE((GO->hasPrivateLinkage() ? "private_linkage " : "")
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133 << (GO->hasLocalLinkage() ? "local_linkage " : "")
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134 << (GO->hasInternalLinkage() ? "internal " : "")
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135 << (GO->hasExternalLinkage() ? "external " : "")
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136 << (GO->hasCommonLinkage() ? "common_linkage " : "")
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137 << (GO->hasCommonLinkage() ? "common " : "" )
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138 << (Kind.isCommon() ? "kind_common " : "" )
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139 << (Kind.isBSS() ? "kind_bss " : "" )
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140 << (Kind.isBSSLocal() ? "kind_bss_local " : "" ));
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141
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142 // If the lookup table is used by more than one function, do not place
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143 // it in text section.
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144 if (EmitLutInText && GO->getName().startswith("switch.table")) {
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145 if (const Function *Fn = getLutUsedFunction(GO))
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146 return selectSectionForLookupTable(GO, TM, Fn);
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147 }
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148
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149 if (isGlobalInSmallSection(GO, TM))
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150 return selectSmallSectionForGlobal(GO, Kind, TM);
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151
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152 if (Kind.isCommon()) {
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153 // This is purely for LTO+Linker Script because commons don't really have a
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154 // section. However, the BitcodeSectionWriter pass will query for the
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155 // sections of commons (and the linker expects us to know their section) so
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156 // we'll return one here.
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157 return BSSSection;
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158 }
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159
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160 TRACE("default_ELF_section\n");
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161 // Otherwise, we work the same as ELF.
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162 return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
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163 }
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164
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165 MCSection *HexagonTargetObjectFile::getExplicitSectionGlobal(
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166 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
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167 TRACE("[getExplicitSectionGlobal] GO(" << GO->getName() << ") from("
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168 << GO->getSection() << ") ");
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169 TRACE((GO->hasPrivateLinkage() ? "private_linkage " : "")
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170 << (GO->hasLocalLinkage() ? "local_linkage " : "")
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171 << (GO->hasInternalLinkage() ? "internal " : "")
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172 << (GO->hasExternalLinkage() ? "external " : "")
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173 << (GO->hasCommonLinkage() ? "common_linkage " : "")
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174 << (GO->hasCommonLinkage() ? "common " : "" )
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175 << (Kind.isCommon() ? "kind_common " : "" )
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176 << (Kind.isBSS() ? "kind_bss " : "" )
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177 << (Kind.isBSSLocal() ? "kind_bss_local " : "" ));
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178
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179 if (GO->hasSection()) {
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180 StringRef Section = GO->getSection();
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181 if (Section.find(".access.text.group") != StringRef::npos)
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182 return getContext().getELFSection(GO->getSection(), ELF::SHT_PROGBITS,
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183 ELF::SHF_ALLOC | ELF::SHF_EXECINSTR);
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184 if (Section.find(".access.data.group") != StringRef::npos)
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185 return getContext().getELFSection(GO->getSection(), ELF::SHT_PROGBITS,
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186 ELF::SHF_WRITE | ELF::SHF_ALLOC);
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187 }
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188
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189 if (isGlobalInSmallSection(GO, TM))
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190 return selectSmallSectionForGlobal(GO, Kind, TM);
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191
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192 // Otherwise, we work the same as ELF.
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193 TRACE("default_ELF_section\n");
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194 return TargetLoweringObjectFileELF::getExplicitSectionGlobal(GO, Kind, TM);
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195 }
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196
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197 /// Return true if this global value should be placed into small data/bss
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198 /// section.
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199 bool HexagonTargetObjectFile::isGlobalInSmallSection(const GlobalObject *GO,
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200 const TargetMachine &TM) const {
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201 bool HaveSData = isSmallDataEnabled(TM);
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202 if (!HaveSData)
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203 LLVM_DEBUG(dbgs() << "Small-data allocation is disabled, but symbols "
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204 "may have explicit section assignments...\n");
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205 // Only global variables, not functions.
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206 LLVM_DEBUG(dbgs() << "Checking if value is in small-data, -G"
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207 << SmallDataThreshold << ": \"" << GO->getName() << "\": ");
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208 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GO);
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209 if (!GVar) {
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210 LLVM_DEBUG(dbgs() << "no, not a global variable\n");
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211 return false;
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212 }
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213
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214 // Globals with external linkage that have an original section set must be
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215 // emitted to that section, regardless of whether we would put them into
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216 // small data or not. This is how we can support mixing -G0/-G8 in LTO.
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217 if (GVar->hasSection()) {
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218 bool IsSmall = isSmallDataSection(GVar->getSection());
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219 LLVM_DEBUG(dbgs() << (IsSmall ? "yes" : "no")
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220 << ", has section: " << GVar->getSection() << '\n');
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221 return IsSmall;
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222 }
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223
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224 // If sdata is disabled, stop the checks here.
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225 if (!HaveSData) {
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226 LLVM_DEBUG(dbgs() << "no, small-data allocation is disabled\n");
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227 return false;
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228 }
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229
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230 if (GVar->isConstant()) {
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231 LLVM_DEBUG(dbgs() << "no, is a constant\n");
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232 return false;
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233 }
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234
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235 bool IsLocal = GVar->hasLocalLinkage();
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236 if (!StaticsInSData && IsLocal) {
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237 LLVM_DEBUG(dbgs() << "no, is static\n");
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238 return false;
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239 }
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240
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241 Type *GType = GVar->getValueType();
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242 if (isa<ArrayType>(GType)) {
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243 LLVM_DEBUG(dbgs() << "no, is an array\n");
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244 return false;
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245 }
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246
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247 // If the type is a struct with no body provided, treat is conservatively.
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248 // There cannot be actual definitions of object of such a type in this CU
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249 // (only references), so assuming that they are not in sdata is safe. If
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250 // these objects end up in the sdata, the references will still be valid.
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251 if (StructType *ST = dyn_cast<StructType>(GType)) {
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252 if (ST->isOpaque()) {
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253 LLVM_DEBUG(dbgs() << "no, has opaque type\n");
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254 return false;
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255 }
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256 }
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257
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258 unsigned Size = GVar->getParent()->getDataLayout().getTypeAllocSize(GType);
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259 if (Size == 0) {
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260 LLVM_DEBUG(dbgs() << "no, has size 0\n");
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261 return false;
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262 }
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263 if (Size > SmallDataThreshold) {
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264 LLVM_DEBUG(dbgs() << "no, size exceeds sdata threshold: " << Size << '\n');
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265 return false;
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266 }
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267
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268 LLVM_DEBUG(dbgs() << "yes\n");
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269 return true;
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270 }
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271
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272 bool HexagonTargetObjectFile::isSmallDataEnabled(const TargetMachine &TM)
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273 const {
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274 return SmallDataThreshold > 0 && !TM.isPositionIndependent();
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275 }
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276
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277 unsigned HexagonTargetObjectFile::getSmallDataSize() const {
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278 return SmallDataThreshold;
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279 }
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280
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281 bool HexagonTargetObjectFile::shouldPutJumpTableInFunctionSection(
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282 bool UsesLabelDifference, const Function &F) const {
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283 return EmitJtInText;
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284 }
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285
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286 /// Descends any type down to "elementary" components,
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287 /// discovering the smallest addressable one.
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288 /// If zero is returned, declaration will not be modified.
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289 unsigned HexagonTargetObjectFile::getSmallestAddressableSize(const Type *Ty,
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290 const GlobalValue *GV, const TargetMachine &TM) const {
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291 // Assign the smallest element access size to the highest
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292 // value which assembler can handle.
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293 unsigned SmallestElement = 8;
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294
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295 if (!Ty)
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296 return 0;
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297 switch (Ty->getTypeID()) {
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298 case Type::StructTyID: {
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299 const StructType *STy = cast<const StructType>(Ty);
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300 for (auto &E : STy->elements()) {
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301 unsigned AtomicSize = getSmallestAddressableSize(E, GV, TM);
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302 if (AtomicSize < SmallestElement)
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303 SmallestElement = AtomicSize;
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304 }
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305 return (STy->getNumElements() == 0) ? 0 : SmallestElement;
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306 }
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307 case Type::ArrayTyID: {
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308 const ArrayType *ATy = cast<const ArrayType>(Ty);
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309 return getSmallestAddressableSize(ATy->getElementType(), GV, TM);
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310 }
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311 case Type::VectorTyID: {
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312 const VectorType *PTy = cast<const VectorType>(Ty);
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313 return getSmallestAddressableSize(PTy->getElementType(), GV, TM);
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314 }
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315 case Type::PointerTyID:
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316 case Type::HalfTyID:
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317 case Type::FloatTyID:
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318 case Type::DoubleTyID:
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319 case Type::IntegerTyID: {
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320 const DataLayout &DL = GV->getParent()->getDataLayout();
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321 // It is unfortunate that DL's function take non-const Type*.
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322 return DL.getTypeAllocSize(const_cast<Type*>(Ty));
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323 }
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324 case Type::FunctionTyID:
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325 case Type::VoidTyID:
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326 case Type::X86_FP80TyID:
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327 case Type::FP128TyID:
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328 case Type::PPC_FP128TyID:
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329 case Type::LabelTyID:
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330 case Type::MetadataTyID:
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331 case Type::X86_MMXTyID:
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332 case Type::TokenTyID:
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152
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333 #ifndef noCbC
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334 case Type::__CodeTyID:
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335 #endif
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150
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336 return 0;
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337 }
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338
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339 return 0;
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340 }
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341
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342 MCSection *HexagonTargetObjectFile::selectSmallSectionForGlobal(
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343 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
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344 const Type *GTy = GO->getValueType();
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345 unsigned Size = getSmallestAddressableSize(GTy, GO, TM);
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346
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347 // If we have -ffunction-section or -fdata-section then we should emit the
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348 // global value to a unique section specifically for it... even for sdata.
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349 bool EmitUniquedSection = TM.getDataSections();
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350
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351 TRACE("Small data. Size(" << Size << ")");
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352 // Handle Small Section classification here.
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353 if (Kind.isBSS() || Kind.isBSSLocal()) {
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354 // If -mno-sort-sda is not set, find out smallest accessible entity in
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355 // declaration and add it to the section name string.
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356 // Note. It does not track the actual usage of the value, only its de-
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357 // claration. Also, compiler adds explicit pad fields to some struct
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358 // declarations - they are currently counted towards smallest addres-
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359 // sable entity.
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360 if (NoSmallDataSorting) {
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361 TRACE(" default sbss\n");
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362 return SmallBSSSection;
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363 }
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364
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365 StringRef Prefix(".sbss");
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366 SmallString<128> Name(Prefix);
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367 Name.append(getSectionSuffixForSize(Size));
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368
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369 if (EmitUniquedSection) {
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370 Name.append(".");
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371 Name.append(GO->getName());
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372 }
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373 TRACE(" unique sbss(" << Name << ")\n");
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374 return getContext().getELFSection(Name.str(), ELF::SHT_NOBITS,
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375 ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_HEX_GPREL);
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376 }
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377
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378 if (Kind.isCommon()) {
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379 // This is purely for LTO+Linker Script because commons don't really have a
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380 // section. However, the BitcodeSectionWriter pass will query for the
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381 // sections of commons (and the linker expects us to know their section) so
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382 // we'll return one here.
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383 if (NoSmallDataSorting)
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384 return BSSSection;
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385
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386 Twine Name = Twine(".scommon") + getSectionSuffixForSize(Size);
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387 TRACE(" small COMMON (" << Name << ")\n");
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388
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389 return getContext().getELFSection(Name.str(), ELF::SHT_NOBITS,
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390 ELF::SHF_WRITE | ELF::SHF_ALLOC |
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391 ELF::SHF_HEX_GPREL);
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392 }
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393
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394 // We could have changed sdata object to a constant... in this
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395 // case the Kind could be wrong for it.
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396 if (Kind.isMergeableConst()) {
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397 TRACE(" const_object_as_data ");
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398 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GO);
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399 if (GVar->hasSection() && isSmallDataSection(GVar->getSection()))
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400 Kind = SectionKind::getData();
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401 }
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402
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403 if (Kind.isData()) {
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404 if (NoSmallDataSorting) {
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405 TRACE(" default sdata\n");
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406 return SmallDataSection;
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407 }
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408
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409 StringRef Prefix(".sdata");
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410 SmallString<128> Name(Prefix);
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411 Name.append(getSectionSuffixForSize(Size));
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412
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413 if (EmitUniquedSection) {
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414 Name.append(".");
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415 Name.append(GO->getName());
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416 }
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417 TRACE(" unique sdata(" << Name << ")\n");
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418 return getContext().getELFSection(Name.str(), ELF::SHT_PROGBITS,
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419 ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_HEX_GPREL);
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420 }
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421
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422 TRACE("default ELF section\n");
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423 // Otherwise, we work the same as ELF.
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424 return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
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425 }
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426
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427 // Return the function that uses the lookup table. If there are more
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428 // than one live function that uses this look table, bail out and place
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429 // the lookup table in default section.
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430 const Function *
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431 HexagonTargetObjectFile::getLutUsedFunction(const GlobalObject *GO) const {
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432 const Function *ReturnFn = nullptr;
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433 for (auto U : GO->users()) {
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434 // validate each instance of user to be a live function.
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435 auto *I = dyn_cast<Instruction>(U);
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|
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436 if (!I)
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437 continue;
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|
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438 auto *Bb = I->getParent();
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|
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439 if (!Bb)
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440 continue;
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|
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441 auto *UserFn = Bb->getParent();
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|
|
442 if (!ReturnFn)
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443 ReturnFn = UserFn;
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444 else if (ReturnFn != UserFn)
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|
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445 return nullptr;
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|
|
446 }
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|
|
447 return ReturnFn;
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|
|
448 }
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|
|
449
|
|
|
450 MCSection *HexagonTargetObjectFile::selectSectionForLookupTable(
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451 const GlobalObject *GO, const TargetMachine &TM, const Function *Fn) const {
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452
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|
|
453 SectionKind Kind = SectionKind::getText();
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454 // If the function has explicit section, place the lookup table in this
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|
|
455 // explicit section.
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|
|
456 if (Fn->hasSection())
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|
|
457 return getExplicitSectionGlobal(Fn, Kind, TM);
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|
|
458
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|
|
459 const auto *FuncObj = dyn_cast<GlobalObject>(Fn);
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|
|
460 return SelectSectionForGlobal(FuncObj, Kind, TM);
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|
|
461 }
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