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1 //===-- HexagonTargetObjectFile.cpp ---------------------------------------===//
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2 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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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 // This file contains the declarations of the HexagonTargetAsmInfo properties.
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11 //
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12 //===----------------------------------------------------------------------===//
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121
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13
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120
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14 #define DEBUG_TYPE "hexagon-sdata"
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15
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16 #include "HexagonTargetObjectFile.h"
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121
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17 #include "llvm/ADT/SmallString.h"
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18 #include "llvm/ADT/StringRef.h"
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19 #include "llvm/ADT/Twine.h"
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20 #include "llvm/BinaryFormat/ELF.h"
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21 #include "llvm/IR/DataLayout.h"
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22 #include "llvm/IR/DerivedTypes.h"
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121
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23 #include "llvm/IR/GlobalObject.h"
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24 #include "llvm/IR/GlobalValue.h"
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25 #include "llvm/IR/GlobalVariable.h"
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121
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26 #include "llvm/IR/Type.h"
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27 #include "llvm/MC/MCContext.h"
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121
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28 #include "llvm/MC/SectionKind.h"
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29 #include "llvm/Support/Casting.h"
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30 #include "llvm/Support/CommandLine.h"
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121
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31 #include "llvm/Support/Debug.h"
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32 #include "llvm/Support/raw_ostream.h"
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33 #include "llvm/Target/TargetMachine.h"
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34
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35 using namespace llvm;
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36
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120
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37 static cl::opt<unsigned> SmallDataThreshold("hexagon-small-data-threshold",
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38 cl::init(8), cl::Hidden,
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39 cl::desc("The maximum size of an object in the sdata section"));
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40
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41 static cl::opt<bool> NoSmallDataSorting("mno-sort-sda", cl::init(false),
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42 cl::Hidden, cl::desc("Disable small data sections sorting"));
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43
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44 static cl::opt<bool> StaticsInSData("hexagon-statics-in-small-data",
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45 cl::init(false), cl::Hidden, cl::ZeroOrMore,
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46 cl::desc("Allow static variables in .sdata"));
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47
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48 static cl::opt<bool> TraceGVPlacement("trace-gv-placement",
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49 cl::Hidden, cl::init(false),
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50 cl::desc("Trace global value placement"));
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51
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121
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52 static cl::opt<bool>
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53 EmitJtInText("hexagon-emit-jt-text", cl::Hidden, cl::init(false),
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54 cl::desc("Emit hexagon jump tables in function section"));
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55
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56 static cl::opt<bool>
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57 EmitLutInText("hexagon-emit-lut-text", cl::Hidden, cl::init(false),
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58 cl::desc("Emit hexagon lookup tables in function section"));
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59
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120
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60 // TraceGVPlacement controls messages for all builds. For builds with assertions
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61 // (debug or release), messages are also controlled by the usual debug flags
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62 // (e.g. -debug and -debug-only=globallayout)
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63 #define TRACE_TO(s, X) s << X
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64 #ifdef NDEBUG
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121
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65 #define TRACE(X) \
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66 do { \
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67 if (TraceGVPlacement) { \
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68 TRACE_TO(errs(), X); \
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69 } \
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70 } while (false)
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120
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71 #else
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121
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72 #define TRACE(X) \
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73 do { \
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74 if (TraceGVPlacement) { \
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75 TRACE_TO(errs(), X); \
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76 } else { \
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77 DEBUG(TRACE_TO(dbgs(), X)); \
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78 } \
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79 } while (false)
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120
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80 #endif
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81
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82 // Returns true if the section name is such that the symbol will be put
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83 // in a small data section.
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84 // For instance, global variables with section attributes such as ".sdata"
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85 // ".sdata.*", ".sbss", and ".sbss.*" will go into small data.
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86 static bool isSmallDataSection(StringRef Sec) {
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87 // sectionName is either ".sdata" or ".sbss". Looking for an exact match
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88 // obviates the need for checks for section names such as ".sdatafoo".
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89 if (Sec.equals(".sdata") || Sec.equals(".sbss") || Sec.equals(".scommon"))
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90 return true;
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91 // If either ".sdata." or ".sbss." is a substring of the section name
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92 // then put the symbol in small data.
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93 return Sec.find(".sdata.") != StringRef::npos ||
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94 Sec.find(".sbss.") != StringRef::npos ||
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95 Sec.find(".scommon.") != StringRef::npos;
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96 }
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97
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98 static const char *getSectionSuffixForSize(unsigned Size) {
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99 switch (Size) {
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100 default:
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101 return "";
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102 case 1:
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103 return ".1";
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104 case 2:
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105 return ".2";
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106 case 4:
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107 return ".4";
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108 case 8:
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109 return ".8";
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110 }
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111 }
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112
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113 void HexagonTargetObjectFile::Initialize(MCContext &Ctx,
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120
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114 const TargetMachine &TM) {
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115 TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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83
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116 InitializeELF(TM.Options.UseInitArray);
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117
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120
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118 SmallDataSection =
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119 getContext().getELFSection(".sdata", ELF::SHT_PROGBITS,
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120 ELF::SHF_WRITE | ELF::SHF_ALLOC |
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121 ELF::SHF_HEX_GPREL);
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122 SmallBSSSection =
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123 getContext().getELFSection(".sbss", ELF::SHT_NOBITS,
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124 ELF::SHF_WRITE | ELF::SHF_ALLOC |
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125 ELF::SHF_HEX_GPREL);
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126 }
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127
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128 MCSection *HexagonTargetObjectFile::SelectSectionForGlobal(
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129 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
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130 TRACE("[SelectSectionForGlobal] GO(" << GO->getName() << ") ");
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131 TRACE("input section(" << GO->getSection() << ") ");
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132
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133 TRACE((GO->hasPrivateLinkage() ? "private_linkage " : "")
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134 << (GO->hasLocalLinkage() ? "local_linkage " : "")
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135 << (GO->hasInternalLinkage() ? "internal " : "")
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136 << (GO->hasExternalLinkage() ? "external " : "")
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137 << (GO->hasCommonLinkage() ? "common_linkage " : "")
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138 << (GO->hasCommonLinkage() ? "common " : "" )
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139 << (Kind.isCommon() ? "kind_common " : "" )
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140 << (Kind.isBSS() ? "kind_bss " : "" )
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141 << (Kind.isBSSLocal() ? "kind_bss_local " : "" ));
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142
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143 // If the lookup table is used by more than one function, do not place
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144 // it in text section.
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145 if (EmitLutInText && GO->getName().startswith("switch.table")) {
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146 if (const Function *Fn = getLutUsedFunction(GO))
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147 return selectSectionForLookupTable(GO, TM, Fn);
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148 }
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149
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150 if (isGlobalInSmallSection(GO, TM))
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151 return selectSmallSectionForGlobal(GO, Kind, TM);
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152
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153 if (Kind.isCommon()) {
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154 // This is purely for LTO+Linker Script because commons don't really have a
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155 // section. However, the BitcodeSectionWriter pass will query for the
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156 // sections of commons (and the linker expects us to know their section) so
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157 // we'll return one here.
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158 return BSSSection;
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159 }
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160
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161 TRACE("default_ELF_section\n");
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162 // Otherwise, we work the same as ELF.
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163 return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
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164 }
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165
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166 MCSection *HexagonTargetObjectFile::getExplicitSectionGlobal(
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167 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
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168 TRACE("[getExplicitSectionGlobal] GO(" << GO->getName() << ") from("
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169 << GO->getSection() << ") ");
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170 TRACE((GO->hasPrivateLinkage() ? "private_linkage " : "")
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171 << (GO->hasLocalLinkage() ? "local_linkage " : "")
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172 << (GO->hasInternalLinkage() ? "internal " : "")
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173 << (GO->hasExternalLinkage() ? "external " : "")
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174 << (GO->hasCommonLinkage() ? "common_linkage " : "")
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175 << (GO->hasCommonLinkage() ? "common " : "" )
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176 << (Kind.isCommon() ? "kind_common " : "" )
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177 << (Kind.isBSS() ? "kind_bss " : "" )
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178 << (Kind.isBSSLocal() ? "kind_bss_local " : "" ));
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179
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180 if (GO->hasSection()) {
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181 StringRef Section = GO->getSection();
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182 if (Section.find(".access.text.group") != StringRef::npos)
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183 return getContext().getELFSection(GO->getSection(), ELF::SHT_PROGBITS,
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184 ELF::SHF_ALLOC | ELF::SHF_EXECINSTR);
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185 if (Section.find(".access.data.group") != StringRef::npos)
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186 return getContext().getELFSection(GO->getSection(), ELF::SHT_PROGBITS,
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187 ELF::SHF_WRITE | ELF::SHF_ALLOC);
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188 }
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189
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190 if (isGlobalInSmallSection(GO, TM))
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191 return selectSmallSectionForGlobal(GO, Kind, TM);
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192
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193 // Otherwise, we work the same as ELF.
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194 TRACE("default_ELF_section\n");
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195 return TargetLoweringObjectFileELF::getExplicitSectionGlobal(GO, Kind, TM);
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196 }
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197
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120
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198 /// Return true if this global value should be placed into small data/bss
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199 /// section.
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200 bool HexagonTargetObjectFile::isGlobalInSmallSection(const GlobalObject *GO,
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201 const TargetMachine &TM) const {
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202 // Only global variables, not functions.
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203 DEBUG(dbgs() << "Checking if value is in small-data, -G"
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204 << SmallDataThreshold << ": \"" << GO->getName() << "\": ");
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205 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GO);
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206 if (!GVar) {
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207 DEBUG(dbgs() << "no, not a global variable\n");
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208 return false;
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209 }
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210
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211 // Globals with external linkage that have an original section set must be
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212 // emitted to that section, regardless of whether we would put them into
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213 // small data or not. This is how we can support mixing -G0/-G8 in LTO.
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214 if (GVar->hasSection()) {
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215 bool IsSmall = isSmallDataSection(GVar->getSection());
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216 DEBUG(dbgs() << (IsSmall ? "yes" : "no") << ", has section: "
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217 << GVar->getSection() << '\n');
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218 return IsSmall;
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219 }
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220
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221 if (GVar->isConstant()) {
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222 DEBUG(dbgs() << "no, is a constant\n");
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223 return false;
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224 }
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225
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226 bool IsLocal = GVar->hasLocalLinkage();
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227 if (!StaticsInSData && IsLocal) {
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228 DEBUG(dbgs() << "no, is static\n");
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229 return false;
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230 }
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231
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232 Type *GType = GVar->getType();
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233 if (PointerType *PT = dyn_cast<PointerType>(GType))
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234 GType = PT->getElementType();
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235
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236 if (isa<ArrayType>(GType)) {
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237 DEBUG(dbgs() << "no, is an array\n");
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238 return false;
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239 }
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240
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241 // If the type is a struct with no body provided, treat is conservatively.
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242 // There cannot be actual definitions of object of such a type in this CU
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243 // (only references), so assuming that they are not in sdata is safe. If
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244 // these objects end up in the sdata, the references will still be valid.
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245 if (StructType *ST = dyn_cast<StructType>(GType)) {
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246 if (ST->isOpaque()) {
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247 DEBUG(dbgs() << "no, has opaque type\n");
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248 return false;
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249 }
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250 }
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251
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252 unsigned Size = GVar->getParent()->getDataLayout().getTypeAllocSize(GType);
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253 if (Size == 0) {
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254 DEBUG(dbgs() << "no, has size 0\n");
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255 return false;
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256 }
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257 if (Size > SmallDataThreshold) {
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258 DEBUG(dbgs() << "no, size exceeds sdata threshold: " << Size << '\n');
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259 return false;
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260 }
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261
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262 DEBUG(dbgs() << "yes\n");
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263 return true;
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264 }
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265
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266 bool HexagonTargetObjectFile::isSmallDataEnabled() const {
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267 return SmallDataThreshold > 0;
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268 }
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269
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120
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270 unsigned HexagonTargetObjectFile::getSmallDataSize() const {
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271 return SmallDataThreshold;
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272 }
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273
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121
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274 bool HexagonTargetObjectFile::shouldPutJumpTableInFunctionSection(
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275 bool UsesLabelDifference, const Function &F) const {
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276 return EmitJtInText;
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277 }
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120
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278
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279 /// Descends any type down to "elementary" components,
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280 /// discovering the smallest addressable one.
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281 /// If zero is returned, declaration will not be modified.
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282 unsigned HexagonTargetObjectFile::getSmallestAddressableSize(const Type *Ty,
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283 const GlobalValue *GV, const TargetMachine &TM) const {
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284 // Assign the smallest element access size to the highest
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285 // value which assembler can handle.
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286 unsigned SmallestElement = 8;
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287
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120
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288 if (!Ty)
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289 return 0;
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290 switch (Ty->getTypeID()) {
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291 case Type::StructTyID: {
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292 const StructType *STy = cast<const StructType>(Ty);
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293 for (auto &E : STy->elements()) {
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294 unsigned AtomicSize = getSmallestAddressableSize(E, GV, TM);
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295 if (AtomicSize < SmallestElement)
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296 SmallestElement = AtomicSize;
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297 }
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298 return (STy->getNumElements() == 0) ? 0 : SmallestElement;
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299 }
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300 case Type::ArrayTyID: {
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301 const ArrayType *ATy = cast<const ArrayType>(Ty);
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302 return getSmallestAddressableSize(ATy->getElementType(), GV, TM);
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303 }
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304 case Type::VectorTyID: {
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305 const VectorType *PTy = cast<const VectorType>(Ty);
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306 return getSmallestAddressableSize(PTy->getElementType(), GV, TM);
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307 }
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308 case Type::PointerTyID:
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309 case Type::HalfTyID:
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310 case Type::FloatTyID:
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311 case Type::DoubleTyID:
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312 case Type::IntegerTyID: {
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313 const DataLayout &DL = GV->getParent()->getDataLayout();
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314 // It is unfortunate that DL's function take non-const Type*.
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315 return DL.getTypeAllocSize(const_cast<Type*>(Ty));
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316 }
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317 case Type::FunctionTyID:
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318 case Type::VoidTyID:
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319 case Type::X86_FP80TyID:
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320 case Type::FP128TyID:
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321 case Type::PPC_FP128TyID:
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322 case Type::LabelTyID:
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323 case Type::MetadataTyID:
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324 case Type::X86_MMXTyID:
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325 case Type::TokenTyID:
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326 return 0;
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327 }
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328
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329 return 0;
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330 }
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331
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120
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332 MCSection *HexagonTargetObjectFile::selectSmallSectionForGlobal(
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333 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
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334 const Type *GTy = GO->getType()->getElementType();
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335 unsigned Size = getSmallestAddressableSize(GTy, GO, TM);
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336
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337 // If we have -ffunction-section or -fdata-section then we should emit the
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338 // global value to a unique section specifically for it... even for sdata.
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339 bool EmitUniquedSection = TM.getDataSections();
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340
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120
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341 TRACE("Small data. Size(" << Size << ")");
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342 // Handle Small Section classification here.
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343 if (Kind.isBSS() || Kind.isBSSLocal()) {
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344 // If -mno-sort-sda is not set, find out smallest accessible entity in
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345 // declaration and add it to the section name string.
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346 // Note. It does not track the actual usage of the value, only its de-
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347 // claration. Also, compiler adds explicit pad fields to some struct
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348 // declarations - they are currently counted towards smallest addres-
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349 // sable entity.
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350 if (NoSmallDataSorting) {
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351 TRACE(" default sbss\n");
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352 return SmallBSSSection;
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353 }
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354
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355 StringRef Prefix(".sbss");
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356 SmallString<128> Name(Prefix);
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357 Name.append(getSectionSuffixForSize(Size));
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358
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359 if (EmitUniquedSection) {
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360 Name.append(".");
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361 Name.append(GO->getName());
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362 }
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363 TRACE(" unique sbss(" << Name << ")\n");
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364 return getContext().getELFSection(Name.str(), ELF::SHT_NOBITS,
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365 ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_HEX_GPREL);
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366 }
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367
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120
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368 if (Kind.isCommon()) {
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369 // This is purely for LTO+Linker Script because commons don't really have a
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370 // section. However, the BitcodeSectionWriter pass will query for the
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371 // sections of commons (and the linker expects us to know their section) so
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372 // we'll return one here.
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373 if (NoSmallDataSorting)
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374 return BSSSection;
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375
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120
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376 Twine Name = Twine(".scommon") + getSectionSuffixForSize(Size);
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377 TRACE(" small COMMON (" << Name << ")\n");
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378
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379 return getContext().getELFSection(Name.str(), ELF::SHT_NOBITS,
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|
380 ELF::SHF_WRITE | ELF::SHF_ALLOC |
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|
381 ELF::SHF_HEX_GPREL);
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382 }
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383
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120
|
384 // We could have changed sdata object to a constant... in this
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385 // case the Kind could be wrong for it.
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|
|
386 if (Kind.isMergeableConst()) {
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387 TRACE(" const_object_as_data ");
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|
388 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GO);
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|
389 if (GVar->hasSection() && isSmallDataSection(GVar->getSection()))
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390 Kind = SectionKind::getData();
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|
|
391 }
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392
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|
|
393 if (Kind.isData()) {
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|
|
394 if (NoSmallDataSorting) {
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|
395 TRACE(" default sdata\n");
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|
396 return SmallDataSection;
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|
|
397 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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|
398
|
|
120
|
399 StringRef Prefix(".sdata");
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|
|
400 SmallString<128> Name(Prefix);
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|
|
401 Name.append(getSectionSuffixForSize(Size));
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|
|
402
|
|
|
403 if (EmitUniquedSection) {
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|
|
404 Name.append(".");
|
|
|
405 Name.append(GO->getName());
|
|
|
406 }
|
|
|
407 TRACE(" unique sdata(" << Name << ")\n");
|
|
|
408 return getContext().getELFSection(Name.str(), ELF::SHT_PROGBITS,
|
|
|
409 ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_HEX_GPREL);
|
|
|
410 }
|
|
|
411
|
|
|
412 TRACE("default ELF section\n");
|
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
413 // Otherwise, we work the same as ELF.
|
|
120
|
414 return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
415 }
|
|
121
|
416
|
|
|
417 // Return the function that uses the lookup table. If there are more
|
|
|
418 // than one live function that uses this look table, bail out and place
|
|
|
419 // the lookup table in default section.
|
|
|
420 const Function *
|
|
|
421 HexagonTargetObjectFile::getLutUsedFunction(const GlobalObject *GO) const {
|
|
|
422 const Function *ReturnFn = nullptr;
|
|
|
423 for (auto U : GO->users()) {
|
|
|
424 // validate each instance of user to be a live function.
|
|
|
425 auto *I = dyn_cast<Instruction>(U);
|
|
|
426 if (!I)
|
|
|
427 continue;
|
|
|
428 auto *Bb = I->getParent();
|
|
|
429 if (!Bb)
|
|
|
430 continue;
|
|
|
431 auto *UserFn = Bb->getParent();
|
|
|
432 if (!ReturnFn)
|
|
|
433 ReturnFn = UserFn;
|
|
|
434 else if (ReturnFn != UserFn)
|
|
|
435 return nullptr;
|
|
|
436 }
|
|
|
437 return ReturnFn;
|
|
|
438 }
|
|
|
439
|
|
|
440 MCSection *HexagonTargetObjectFile::selectSectionForLookupTable(
|
|
|
441 const GlobalObject *GO, const TargetMachine &TM, const Function *Fn) const {
|
|
|
442
|
|
|
443 SectionKind Kind = SectionKind::getText();
|
|
|
444 // If the function has explicit section, place the lookup table in this
|
|
|
445 // explicit section.
|
|
|
446 if (Fn->hasSection())
|
|
|
447 return getExplicitSectionGlobal(Fn, Kind, TM);
|
|
|
448
|
|
|
449 const auto *FuncObj = dyn_cast<GlobalObject>(Fn);
|
|
|
450 return SelectSectionForGlobal(FuncObj, Kind, TM);
|
|
|
451 }
|
