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1 #include "DwarfCompileUnit.h"
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2 #include "DwarfExpression.h"
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3 #include "llvm/CodeGen/MachineFunction.h"
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4 #include "llvm/IR/DataLayout.h"
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5 #include "llvm/IR/GlobalValue.h"
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6 #include "llvm/IR/GlobalVariable.h"
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7 #include "llvm/IR/Instruction.h"
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8 #include "llvm/MC/MCAsmInfo.h"
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9 #include "llvm/MC/MCStreamer.h"
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10 #include "llvm/Target/TargetFrameLowering.h"
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11 #include "llvm/Target/TargetLoweringObjectFile.h"
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12 #include "llvm/Target/TargetMachine.h"
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13 #include "llvm/Target/TargetRegisterInfo.h"
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14 #include "llvm/Target/TargetSubtargetInfo.h"
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15
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16 namespace llvm {
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17
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18 DwarfCompileUnit::DwarfCompileUnit(unsigned UID, DICompileUnit Node,
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19 AsmPrinter *A, DwarfDebug *DW,
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20 DwarfFile *DWU)
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21 : DwarfUnit(UID, dwarf::DW_TAG_compile_unit, Node, A, DW, DWU),
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22 Skeleton(nullptr), LabelBegin(nullptr), BaseAddress(nullptr) {
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23 insertDIE(Node, &getUnitDie());
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24 }
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25
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26 /// addLabelAddress - Add a dwarf label attribute data and value using
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27 /// DW_FORM_addr or DW_FORM_GNU_addr_index.
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28 ///
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29 void DwarfCompileUnit::addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
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30 const MCSymbol *Label) {
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31
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32 // Don't use the address pool in non-fission or in the skeleton unit itself.
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33 // FIXME: Once GDB supports this, it's probably worthwhile using the address
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34 // pool from the skeleton - maybe even in non-fission (possibly fewer
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35 // relocations by sharing them in the pool, but we have other ideas about how
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36 // to reduce the number of relocations as well/instead).
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37 if (!DD->useSplitDwarf() || !Skeleton)
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38 return addLocalLabelAddress(Die, Attribute, Label);
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39
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40 if (Label)
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41 DD->addArangeLabel(SymbolCU(this, Label));
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42
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43 unsigned idx = DD->getAddressPool().getIndex(Label);
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44 DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
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45 Die.addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value);
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46 }
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47
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48 void DwarfCompileUnit::addLocalLabelAddress(DIE &Die,
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49 dwarf::Attribute Attribute,
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50 const MCSymbol *Label) {
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51 if (Label)
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52 DD->addArangeLabel(SymbolCU(this, Label));
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53
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54 Die.addValue(Attribute, dwarf::DW_FORM_addr,
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55 Label ? (DIEValue *)new (DIEValueAllocator) DIELabel(Label)
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56 : new (DIEValueAllocator) DIEInteger(0));
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57 }
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58
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59 unsigned DwarfCompileUnit::getOrCreateSourceID(StringRef FileName,
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60 StringRef DirName) {
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61 // If we print assembly, we can't separate .file entries according to
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62 // compile units. Thus all files will belong to the default compile unit.
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63
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64 // FIXME: add a better feature test than hasRawTextSupport. Even better,
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65 // extend .file to support this.
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66 return Asm->OutStreamer.EmitDwarfFileDirective(
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67 0, DirName, FileName,
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68 Asm->OutStreamer.hasRawTextSupport() ? 0 : getUniqueID());
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69 }
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70
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71 // Return const expression if value is a GEP to access merged global
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72 // constant. e.g.
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73 // i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
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74 static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
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75 const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
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76 if (!CE || CE->getNumOperands() != 3 ||
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77 CE->getOpcode() != Instruction::GetElementPtr)
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78 return nullptr;
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79
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80 // First operand points to a global struct.
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81 Value *Ptr = CE->getOperand(0);
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82 if (!isa<GlobalValue>(Ptr) ||
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83 !isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
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84 return nullptr;
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85
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86 // Second operand is zero.
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87 const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
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88 if (!CI || !CI->isZero())
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89 return nullptr;
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90
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91 // Third operand is offset.
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92 if (!isa<ConstantInt>(CE->getOperand(2)))
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93 return nullptr;
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94
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95 return CE;
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96 }
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97
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98 /// getOrCreateGlobalVariableDIE - get or create global variable DIE.
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99 DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(DIGlobalVariable GV) {
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100 // Check for pre-existence.
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101 if (DIE *Die = getDIE(GV))
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102 return Die;
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103
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104 assert(GV.isGlobalVariable());
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105
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106 DIScope GVContext = GV.getContext();
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107 DIType GTy = DD->resolve(GV.getType());
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108
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109 // Construct the context before querying for the existence of the DIE in
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110 // case such construction creates the DIE.
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111 DIE *ContextDIE = getOrCreateContextDIE(GVContext);
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112
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113 // Add to map.
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114 DIE *VariableDIE = &createAndAddDIE(GV.getTag(), *ContextDIE, GV);
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115 DIScope DeclContext;
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116
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117 if (DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration()) {
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118 DeclContext = resolve(SDMDecl.getContext());
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119 assert(SDMDecl.isStaticMember() && "Expected static member decl");
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120 assert(GV.isDefinition());
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121 // We need the declaration DIE that is in the static member's class.
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122 DIE *VariableSpecDIE = getOrCreateStaticMemberDIE(SDMDecl);
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123 addDIEEntry(*VariableDIE, dwarf::DW_AT_specification, *VariableSpecDIE);
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124 } else {
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125 DeclContext = GV.getContext();
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126 // Add name and type.
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127 addString(*VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
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128 addType(*VariableDIE, GTy);
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129
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130 // Add scoping info.
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131 if (!GV.isLocalToUnit())
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132 addFlag(*VariableDIE, dwarf::DW_AT_external);
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133
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134 // Add line number info.
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135 addSourceLine(*VariableDIE, GV);
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136 }
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137
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138 if (!GV.isDefinition())
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139 addFlag(*VariableDIE, dwarf::DW_AT_declaration);
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140
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141 // Add location.
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142 bool addToAccelTable = false;
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143 bool isGlobalVariable = GV.getGlobal() != nullptr;
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144 if (isGlobalVariable) {
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145 addToAccelTable = true;
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146 DIELoc *Loc = new (DIEValueAllocator) DIELoc();
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147 const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal());
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148 if (GV.getGlobal()->isThreadLocal()) {
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149 // FIXME: Make this work with -gsplit-dwarf.
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150 unsigned PointerSize = Asm->getDataLayout().getPointerSize();
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151 assert((PointerSize == 4 || PointerSize == 8) &&
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152 "Add support for other sizes if necessary");
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153 // Based on GCC's support for TLS:
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154 if (!DD->useSplitDwarf()) {
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155 // 1) Start with a constNu of the appropriate pointer size
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156 addUInt(*Loc, dwarf::DW_FORM_data1,
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157 PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
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158 // 2) containing the (relocated) offset of the TLS variable
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159 // within the module's TLS block.
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160 addExpr(*Loc, dwarf::DW_FORM_udata,
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161 Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym));
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162 } else {
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163 addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
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164 addUInt(*Loc, dwarf::DW_FORM_udata,
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165 DD->getAddressPool().getIndex(Sym, /* TLS */ true));
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166 }
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167 // 3) followed by a custom OP to make the debugger do a TLS lookup.
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168 addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
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169 } else {
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170 DD->addArangeLabel(SymbolCU(this, Sym));
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171 addOpAddress(*Loc, Sym);
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172 }
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173
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174 addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
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175 // Add the linkage name.
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176 StringRef LinkageName = GV.getLinkageName();
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177 if (!LinkageName.empty())
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178 // From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
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179 // TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
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180 // TAG_variable.
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181 addString(*VariableDIE,
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182 DD->getDwarfVersion() >= 4 ? dwarf::DW_AT_linkage_name
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183 : dwarf::DW_AT_MIPS_linkage_name,
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184 GlobalValue::getRealLinkageName(LinkageName));
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185 } else if (const ConstantInt *CI =
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186 dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
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187 addConstantValue(*VariableDIE, CI, GTy);
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188 } else if (const ConstantExpr *CE = getMergedGlobalExpr(GV.getConstant())) {
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189 addToAccelTable = true;
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190 // GV is a merged global.
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191 DIELoc *Loc = new (DIEValueAllocator) DIELoc();
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192 Value *Ptr = CE->getOperand(0);
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193 MCSymbol *Sym = Asm->getSymbol(cast<GlobalValue>(Ptr));
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194 DD->addArangeLabel(SymbolCU(this, Sym));
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195 addOpAddress(*Loc, Sym);
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196 addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
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197 SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end());
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198 addUInt(*Loc, dwarf::DW_FORM_udata,
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199 Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
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200 addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
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201 addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
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202 }
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203
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204 if (addToAccelTable) {
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205 DD->addAccelName(GV.getName(), *VariableDIE);
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206
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207 // If the linkage name is different than the name, go ahead and output
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208 // that as well into the name table.
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209 if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
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210 DD->addAccelName(GV.getLinkageName(), *VariableDIE);
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211 }
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212
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213 addGlobalName(GV.getName(), *VariableDIE, DeclContext);
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214 return VariableDIE;
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215 }
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216
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217 void DwarfCompileUnit::addRange(RangeSpan Range) {
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218 bool SameAsPrevCU = this == DD->getPrevCU();
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219 DD->setPrevCU(this);
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220 // If we have no current ranges just add the range and return, otherwise,
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221 // check the current section and CU against the previous section and CU we
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222 // emitted into and the subprogram was contained within. If these are the
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223 // same then extend our current range, otherwise add this as a new range.
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224 if (CURanges.empty() || !SameAsPrevCU ||
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225 (&CURanges.back().getEnd()->getSection() !=
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226 &Range.getEnd()->getSection())) {
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227 CURanges.push_back(Range);
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228 return;
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229 }
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230
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231 CURanges.back().setEnd(Range.getEnd());
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232 }
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233
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234 void DwarfCompileUnit::addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
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235 const MCSymbol *Label,
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236 const MCSymbol *Sec) {
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237 if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
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238 addLabel(Die, Attribute,
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239 DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
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240 : dwarf::DW_FORM_data4,
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241 Label);
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242 else
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243 addSectionDelta(Die, Attribute, Label, Sec);
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244 }
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245
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246 void DwarfCompileUnit::initStmtList(MCSymbol *DwarfLineSectionSym) {
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247 // Define start line table label for each Compile Unit.
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248 MCSymbol *LineTableStartSym =
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249 Asm->OutStreamer.getDwarfLineTableSymbol(getUniqueID());
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250
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251 stmtListIndex = UnitDie.getValues().size();
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252
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253 // DW_AT_stmt_list is a offset of line number information for this
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254 // compile unit in debug_line section. For split dwarf this is
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255 // left in the skeleton CU and so not included.
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256 // The line table entries are not always emitted in assembly, so it
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257 // is not okay to use line_table_start here.
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258 addSectionLabel(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym,
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259 DwarfLineSectionSym);
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260 }
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261
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262 void DwarfCompileUnit::applyStmtList(DIE &D) {
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263 D.addValue(dwarf::DW_AT_stmt_list,
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264 UnitDie.getAbbrev().getData()[stmtListIndex].getForm(),
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265 UnitDie.getValues()[stmtListIndex]);
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266 }
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267
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268 void DwarfCompileUnit::attachLowHighPC(DIE &D, const MCSymbol *Begin,
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269 const MCSymbol *End) {
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270 assert(Begin && "Begin label should not be null!");
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271 assert(End && "End label should not be null!");
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272 assert(Begin->isDefined() && "Invalid starting label");
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273 assert(End->isDefined() && "Invalid end label");
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274
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275 addLabelAddress(D, dwarf::DW_AT_low_pc, Begin);
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276 if (DD->getDwarfVersion() < 4)
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277 addLabelAddress(D, dwarf::DW_AT_high_pc, End);
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278 else
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279 addLabelDelta(D, dwarf::DW_AT_high_pc, End, Begin);
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280 }
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281
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282 // Find DIE for the given subprogram and attach appropriate DW_AT_low_pc
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283 // and DW_AT_high_pc attributes. If there are global variables in this
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284 // scope then create and insert DIEs for these variables.
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285 DIE &DwarfCompileUnit::updateSubprogramScopeDIE(DISubprogram SP) {
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286 DIE *SPDie = getOrCreateSubprogramDIE(SP, includeMinimalInlineScopes());
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287
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288 attachLowHighPC(*SPDie, DD->getFunctionBeginSym(), DD->getFunctionEndSym());
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289 if (!DD->getCurrentFunction()->getTarget().Options.DisableFramePointerElim(
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290 *DD->getCurrentFunction()))
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291 addFlag(*SPDie, dwarf::DW_AT_APPLE_omit_frame_ptr);
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292
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293 // Only include DW_AT_frame_base in full debug info
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294 if (!includeMinimalInlineScopes()) {
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295 const TargetRegisterInfo *RI =
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296 Asm->TM.getSubtargetImpl()->getRegisterInfo();
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297 MachineLocation Location(RI->getFrameRegister(*Asm->MF));
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298 if (RI->isPhysicalRegister(Location.getReg()))
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299 addAddress(*SPDie, dwarf::DW_AT_frame_base, Location);
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300 }
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301
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302 // Add name to the name table, we do this here because we're guaranteed
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303 // to have concrete versions of our DW_TAG_subprogram nodes.
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304 DD->addSubprogramNames(SP, *SPDie);
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305
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306 return *SPDie;
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307 }
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308
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309 // Construct a DIE for this scope.
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310 void DwarfCompileUnit::constructScopeDIE(
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311 LexicalScope *Scope, SmallVectorImpl<std::unique_ptr<DIE>> &FinalChildren) {
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312 if (!Scope || !Scope->getScopeNode())
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313 return;
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314
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315 DIScope DS(Scope->getScopeNode());
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316
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317 assert((Scope->getInlinedAt() || !DS.isSubprogram()) &&
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318 "Only handle inlined subprograms here, use "
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319 "constructSubprogramScopeDIE for non-inlined "
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320 "subprograms");
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321
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322 SmallVector<std::unique_ptr<DIE>, 8> Children;
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323
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324 // We try to create the scope DIE first, then the children DIEs. This will
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325 // avoid creating un-used children then removing them later when we find out
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326 // the scope DIE is null.
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327 std::unique_ptr<DIE> ScopeDIE;
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328 if (Scope->getParent() && DS.isSubprogram()) {
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329 ScopeDIE = constructInlinedScopeDIE(Scope);
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330 if (!ScopeDIE)
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331 return;
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332 // We create children when the scope DIE is not null.
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333 createScopeChildrenDIE(Scope, Children);
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334 } else {
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335 // Early exit when we know the scope DIE is going to be null.
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336 if (DD->isLexicalScopeDIENull(Scope))
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337 return;
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338
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339 unsigned ChildScopeCount;
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340
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341 // We create children here when we know the scope DIE is not going to be
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342 // null and the children will be added to the scope DIE.
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343 createScopeChildrenDIE(Scope, Children, &ChildScopeCount);
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344
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345 // Skip imported directives in gmlt-like data.
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346 if (!includeMinimalInlineScopes()) {
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347 // There is no need to emit empty lexical block DIE.
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348 for (const auto &E : DD->findImportedEntitiesForScope(DS))
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349 Children.push_back(
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350 constructImportedEntityDIE(DIImportedEntity(E.second)));
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351 }
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352
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353 // If there are only other scopes as children, put them directly in the
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354 // parent instead, as this scope would serve no purpose.
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355 if (Children.size() == ChildScopeCount) {
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356 FinalChildren.insert(FinalChildren.end(),
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357 std::make_move_iterator(Children.begin()),
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358 std::make_move_iterator(Children.end()));
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359 return;
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360 }
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361 ScopeDIE = constructLexicalScopeDIE(Scope);
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362 assert(ScopeDIE && "Scope DIE should not be null.");
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363 }
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364
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|
|
365 // Add children
|
|
|
366 for (auto &I : Children)
|
|
|
367 ScopeDIE->addChild(std::move(I));
|
|
|
368
|
|
|
369 FinalChildren.push_back(std::move(ScopeDIE));
|
|
|
370 }
|
|
|
371
|
|
|
372 void DwarfCompileUnit::addSectionDelta(DIE &Die, dwarf::Attribute Attribute,
|
|
|
373 const MCSymbol *Hi, const MCSymbol *Lo) {
|
|
|
374 DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
|
|
|
375 Die.addValue(Attribute, DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
|
|
|
376 : dwarf::DW_FORM_data4,
|
|
|
377 Value);
|
|
|
378 }
|
|
|
379
|
|
|
380 void DwarfCompileUnit::addScopeRangeList(DIE &ScopeDIE,
|
|
|
381 SmallVector<RangeSpan, 2> Range) {
|
|
|
382 // Emit offset in .debug_range as a relocatable label. emitDIE will handle
|
|
|
383 // emitting it appropriately.
|
|
|
384 auto *RangeSectionSym = DD->getRangeSectionSym();
|
|
|
385
|
|
|
386 RangeSpanList List(
|
|
|
387 Asm->GetTempSymbol("debug_ranges", DD->getNextRangeNumber()),
|
|
|
388 std::move(Range));
|
|
|
389
|
|
|
390 // Under fission, ranges are specified by constant offsets relative to the
|
|
|
391 // CU's DW_AT_GNU_ranges_base.
|
|
|
392 if (isDwoUnit())
|
|
|
393 addSectionDelta(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
|
|
|
394 RangeSectionSym);
|
|
|
395 else
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|
|
396 addSectionLabel(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
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|
|
397 RangeSectionSym);
|
|
|
398
|
|
|
399 // Add the range list to the set of ranges to be emitted.
|
|
|
400 (Skeleton ? Skeleton : this)->CURangeLists.push_back(std::move(List));
|
|
|
401 }
|
|
|
402
|
|
|
403 void DwarfCompileUnit::attachRangesOrLowHighPC(
|
|
|
404 DIE &Die, SmallVector<RangeSpan, 2> Ranges) {
|
|
|
405 if (Ranges.size() == 1) {
|
|
|
406 const auto &single = Ranges.front();
|
|
|
407 attachLowHighPC(Die, single.getStart(), single.getEnd());
|
|
|
408 } else
|
|
|
409 addScopeRangeList(Die, std::move(Ranges));
|
|
|
410 }
|
|
|
411
|
|
|
412 void DwarfCompileUnit::attachRangesOrLowHighPC(
|
|
|
413 DIE &Die, const SmallVectorImpl<InsnRange> &Ranges) {
|
|
|
414 SmallVector<RangeSpan, 2> List;
|
|
|
415 List.reserve(Ranges.size());
|
|
|
416 for (const InsnRange &R : Ranges)
|
|
|
417 List.push_back(RangeSpan(DD->getLabelBeforeInsn(R.first),
|
|
|
418 DD->getLabelAfterInsn(R.second)));
|
|
|
419 attachRangesOrLowHighPC(Die, std::move(List));
|
|
|
420 }
|
|
|
421
|
|
|
422 // This scope represents inlined body of a function. Construct DIE to
|
|
|
423 // represent this concrete inlined copy of the function.
|
|
|
424 std::unique_ptr<DIE>
|
|
|
425 DwarfCompileUnit::constructInlinedScopeDIE(LexicalScope *Scope) {
|
|
|
426 assert(Scope->getScopeNode());
|
|
|
427 DIScope DS(Scope->getScopeNode());
|
|
|
428 DISubprogram InlinedSP = getDISubprogram(DS);
|
|
|
429 // Find the subprogram's DwarfCompileUnit in the SPMap in case the subprogram
|
|
|
430 // was inlined from another compile unit.
|
|
|
431 DIE *OriginDIE = DU->getAbstractSPDies()[InlinedSP];
|
|
|
432 assert(OriginDIE && "Unable to find original DIE for an inlined subprogram.");
|
|
|
433
|
|
|
434 auto ScopeDIE = make_unique<DIE>(dwarf::DW_TAG_inlined_subroutine);
|
|
|
435 addDIEEntry(*ScopeDIE, dwarf::DW_AT_abstract_origin, *OriginDIE);
|
|
|
436
|
|
|
437 attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
|
|
|
438
|
|
|
439 // Add the call site information to the DIE.
|
|
|
440 DILocation DL(Scope->getInlinedAt());
|
|
|
441 addUInt(*ScopeDIE, dwarf::DW_AT_call_file, None,
|
|
|
442 getOrCreateSourceID(DL.getFilename(), DL.getDirectory()));
|
|
|
443 addUInt(*ScopeDIE, dwarf::DW_AT_call_line, None, DL.getLineNumber());
|
|
|
444
|
|
|
445 // Add name to the name table, we do this here because we're guaranteed
|
|
|
446 // to have concrete versions of our DW_TAG_inlined_subprogram nodes.
|
|
|
447 DD->addSubprogramNames(InlinedSP, *ScopeDIE);
|
|
|
448
|
|
|
449 return ScopeDIE;
|
|
|
450 }
|
|
|
451
|
|
|
452 // Construct new DW_TAG_lexical_block for this scope and attach
|
|
|
453 // DW_AT_low_pc/DW_AT_high_pc labels.
|
|
|
454 std::unique_ptr<DIE>
|
|
|
455 DwarfCompileUnit::constructLexicalScopeDIE(LexicalScope *Scope) {
|
|
|
456 if (DD->isLexicalScopeDIENull(Scope))
|
|
|
457 return nullptr;
|
|
|
458
|
|
|
459 auto ScopeDIE = make_unique<DIE>(dwarf::DW_TAG_lexical_block);
|
|
|
460 if (Scope->isAbstractScope())
|
|
|
461 return ScopeDIE;
|
|
|
462
|
|
|
463 attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
|
|
|
464
|
|
|
465 return ScopeDIE;
|
|
|
466 }
|
|
|
467
|
|
|
468 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
|
|
|
469 std::unique_ptr<DIE> DwarfCompileUnit::constructVariableDIE(DbgVariable &DV,
|
|
|
470 bool Abstract) {
|
|
|
471 auto D = constructVariableDIEImpl(DV, Abstract);
|
|
|
472 DV.setDIE(*D);
|
|
|
473 return D;
|
|
|
474 }
|
|
|
475
|
|
|
476 std::unique_ptr<DIE>
|
|
|
477 DwarfCompileUnit::constructVariableDIEImpl(const DbgVariable &DV,
|
|
|
478 bool Abstract) {
|
|
|
479 // Define variable debug information entry.
|
|
|
480 auto VariableDie = make_unique<DIE>(DV.getTag());
|
|
|
481
|
|
|
482 if (Abstract) {
|
|
|
483 applyVariableAttributes(DV, *VariableDie);
|
|
|
484 return VariableDie;
|
|
|
485 }
|
|
|
486
|
|
|
487 // Add variable address.
|
|
|
488
|
|
|
489 unsigned Offset = DV.getDotDebugLocOffset();
|
|
|
490 if (Offset != ~0U) {
|
|
|
491 addLocationList(*VariableDie, dwarf::DW_AT_location, Offset);
|
|
|
492 return VariableDie;
|
|
|
493 }
|
|
|
494
|
|
|
495 // Check if variable is described by a DBG_VALUE instruction.
|
|
|
496 if (const MachineInstr *DVInsn = DV.getMInsn()) {
|
|
|
497 assert(DVInsn->getNumOperands() == 4);
|
|
|
498 if (DVInsn->getOperand(0).isReg()) {
|
|
|
499 const MachineOperand RegOp = DVInsn->getOperand(0);
|
|
|
500 // If the second operand is an immediate, this is an indirect value.
|
|
|
501 if (DVInsn->getOperand(1).isImm()) {
|
|
|
502 MachineLocation Location(RegOp.getReg(),
|
|
|
503 DVInsn->getOperand(1).getImm());
|
|
|
504 addVariableAddress(DV, *VariableDie, Location);
|
|
|
505 } else if (RegOp.getReg())
|
|
|
506 addVariableAddress(DV, *VariableDie, MachineLocation(RegOp.getReg()));
|
|
|
507 } else if (DVInsn->getOperand(0).isImm())
|
|
|
508 addConstantValue(*VariableDie, DVInsn->getOperand(0), DV.getType());
|
|
|
509 else if (DVInsn->getOperand(0).isFPImm())
|
|
|
510 addConstantFPValue(*VariableDie, DVInsn->getOperand(0));
|
|
|
511 else if (DVInsn->getOperand(0).isCImm())
|
|
|
512 addConstantValue(*VariableDie, DVInsn->getOperand(0).getCImm(),
|
|
|
513 DV.getType());
|
|
|
514
|
|
|
515 return VariableDie;
|
|
|
516 }
|
|
|
517
|
|
|
518 // .. else use frame index.
|
|
|
519 if (DV.getFrameIndex().back() == ~0)
|
|
|
520 return VariableDie;
|
|
|
521
|
|
|
522 auto Expr = DV.getExpression().begin();
|
|
|
523 DIELoc *Loc = new (DIEValueAllocator) DIELoc();
|
|
|
524 DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
|
|
|
525 for (auto FI : DV.getFrameIndex()) {
|
|
|
526 unsigned FrameReg = 0;
|
|
|
527 const TargetFrameLowering *TFI =
|
|
|
528 Asm->TM.getSubtargetImpl()->getFrameLowering();
|
|
|
529 int Offset = TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
|
|
|
530 assert(Expr != DV.getExpression().end() &&
|
|
|
531 "Wrong number of expressions");
|
|
|
532 DwarfExpr.AddMachineRegIndirect(FrameReg, Offset);
|
|
|
533 DwarfExpr.AddExpression(Expr->begin(), Expr->end());
|
|
|
534 ++Expr;
|
|
|
535 }
|
|
|
536 addBlock(*VariableDie, dwarf::DW_AT_location, Loc);
|
|
|
537
|
|
|
538 return VariableDie;
|
|
|
539 }
|
|
|
540
|
|
|
541 std::unique_ptr<DIE> DwarfCompileUnit::constructVariableDIE(
|
|
|
542 DbgVariable &DV, const LexicalScope &Scope, DIE *&ObjectPointer) {
|
|
|
543 auto Var = constructVariableDIE(DV, Scope.isAbstractScope());
|
|
|
544 if (DV.isObjectPointer())
|
|
|
545 ObjectPointer = Var.get();
|
|
|
546 return Var;
|
|
|
547 }
|
|
|
548
|
|
|
549 DIE *DwarfCompileUnit::createScopeChildrenDIE(
|
|
|
550 LexicalScope *Scope, SmallVectorImpl<std::unique_ptr<DIE>> &Children,
|
|
|
551 unsigned *ChildScopeCount) {
|
|
|
552 DIE *ObjectPointer = nullptr;
|
|
|
553
|
|
|
554 for (DbgVariable *DV : DU->getScopeVariables().lookup(Scope))
|
|
|
555 Children.push_back(constructVariableDIE(*DV, *Scope, ObjectPointer));
|
|
|
556
|
|
|
557 unsigned ChildCountWithoutScopes = Children.size();
|
|
|
558
|
|
|
559 for (LexicalScope *LS : Scope->getChildren())
|
|
|
560 constructScopeDIE(LS, Children);
|
|
|
561
|
|
|
562 if (ChildScopeCount)
|
|
|
563 *ChildScopeCount = Children.size() - ChildCountWithoutScopes;
|
|
|
564
|
|
|
565 return ObjectPointer;
|
|
|
566 }
|
|
|
567
|
|
|
568 void DwarfCompileUnit::constructSubprogramScopeDIE(LexicalScope *Scope) {
|
|
|
569 assert(Scope && Scope->getScopeNode());
|
|
|
570 assert(!Scope->getInlinedAt());
|
|
|
571 assert(!Scope->isAbstractScope());
|
|
|
572 DISubprogram Sub(Scope->getScopeNode());
|
|
|
573
|
|
|
574 assert(Sub.isSubprogram());
|
|
|
575
|
|
|
576 DD->getProcessedSPNodes().insert(Sub);
|
|
|
577
|
|
|
578 DIE &ScopeDIE = updateSubprogramScopeDIE(Sub);
|
|
|
579
|
|
|
580 // If this is a variadic function, add an unspecified parameter.
|
|
|
581 DITypeArray FnArgs = Sub.getType().getTypeArray();
|
|
|
582
|
|
|
583 // Collect lexical scope children first.
|
|
|
584 // ObjectPointer might be a local (non-argument) local variable if it's a
|
|
|
585 // block's synthetic this pointer.
|
|
|
586 if (DIE *ObjectPointer = createAndAddScopeChildren(Scope, ScopeDIE))
|
|
|
587 addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, *ObjectPointer);
|
|
|
588
|
|
|
589 // If we have a single element of null, it is a function that returns void.
|
|
|
590 // If we have more than one elements and the last one is null, it is a
|
|
|
591 // variadic function.
|
|
|
592 if (FnArgs.getNumElements() > 1 &&
|
|
|
593 !FnArgs.getElement(FnArgs.getNumElements() - 1) &&
|
|
|
594 !includeMinimalInlineScopes())
|
|
|
595 ScopeDIE.addChild(make_unique<DIE>(dwarf::DW_TAG_unspecified_parameters));
|
|
|
596 }
|
|
|
597
|
|
|
598 DIE *DwarfCompileUnit::createAndAddScopeChildren(LexicalScope *Scope,
|
|
|
599 DIE &ScopeDIE) {
|
|
|
600 // We create children when the scope DIE is not null.
|
|
|
601 SmallVector<std::unique_ptr<DIE>, 8> Children;
|
|
|
602 DIE *ObjectPointer = createScopeChildrenDIE(Scope, Children);
|
|
|
603
|
|
|
604 // Add children
|
|
|
605 for (auto &I : Children)
|
|
|
606 ScopeDIE.addChild(std::move(I));
|
|
|
607
|
|
|
608 return ObjectPointer;
|
|
|
609 }
|
|
|
610
|
|
|
611 void
|
|
|
612 DwarfCompileUnit::constructAbstractSubprogramScopeDIE(LexicalScope *Scope) {
|
|
|
613 DIE *&AbsDef = DU->getAbstractSPDies()[Scope->getScopeNode()];
|
|
|
614 if (AbsDef)
|
|
|
615 return;
|
|
|
616
|
|
|
617 DISubprogram SP(Scope->getScopeNode());
|
|
|
618
|
|
|
619 DIE *ContextDIE;
|
|
|
620
|
|
|
621 if (includeMinimalInlineScopes())
|
|
|
622 ContextDIE = &getUnitDie();
|
|
|
623 // Some of this is duplicated from DwarfUnit::getOrCreateSubprogramDIE, with
|
|
|
624 // the important distinction that the DIDescriptor is not associated with the
|
|
|
625 // DIE (since the DIDescriptor will be associated with the concrete DIE, if
|
|
|
626 // any). It could be refactored to some common utility function.
|
|
|
627 else if (DISubprogram SPDecl = SP.getFunctionDeclaration()) {
|
|
|
628 ContextDIE = &getUnitDie();
|
|
|
629 getOrCreateSubprogramDIE(SPDecl);
|
|
|
630 } else
|
|
|
631 ContextDIE = getOrCreateContextDIE(resolve(SP.getContext()));
|
|
|
632
|
|
|
633 // Passing null as the associated DIDescriptor because the abstract definition
|
|
|
634 // shouldn't be found by lookup.
|
|
|
635 AbsDef =
|
|
|
636 &createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, DIDescriptor());
|
|
|
637 applySubprogramAttributesToDefinition(SP, *AbsDef);
|
|
|
638
|
|
|
639 if (!includeMinimalInlineScopes())
|
|
|
640 addUInt(*AbsDef, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
|
|
|
641 if (DIE *ObjectPointer = createAndAddScopeChildren(Scope, *AbsDef))
|
|
|
642 addDIEEntry(*AbsDef, dwarf::DW_AT_object_pointer, *ObjectPointer);
|
|
|
643 }
|
|
|
644
|
|
|
645 std::unique_ptr<DIE>
|
|
|
646 DwarfCompileUnit::constructImportedEntityDIE(const DIImportedEntity &Module) {
|
|
|
647 assert(Module.Verify() &&
|
|
|
648 "Use one of the MDNode * overloads to handle invalid metadata");
|
|
|
649 std::unique_ptr<DIE> IMDie = make_unique<DIE>((dwarf::Tag)Module.getTag());
|
|
|
650 insertDIE(Module, IMDie.get());
|
|
|
651 DIE *EntityDie;
|
|
|
652 DIDescriptor Entity = resolve(Module.getEntity());
|
|
|
653 if (Entity.isNameSpace())
|
|
|
654 EntityDie = getOrCreateNameSpace(DINameSpace(Entity));
|
|
|
655 else if (Entity.isSubprogram())
|
|
|
656 EntityDie = getOrCreateSubprogramDIE(DISubprogram(Entity));
|
|
|
657 else if (Entity.isType())
|
|
|
658 EntityDie = getOrCreateTypeDIE(DIType(Entity));
|
|
|
659 else if (Entity.isGlobalVariable())
|
|
|
660 EntityDie = getOrCreateGlobalVariableDIE(DIGlobalVariable(Entity));
|
|
|
661 else
|
|
|
662 EntityDie = getDIE(Entity);
|
|
|
663 assert(EntityDie);
|
|
|
664 addSourceLine(*IMDie, Module.getLineNumber(),
|
|
|
665 Module.getContext().getFilename(),
|
|
|
666 Module.getContext().getDirectory());
|
|
|
667 addDIEEntry(*IMDie, dwarf::DW_AT_import, *EntityDie);
|
|
|
668 StringRef Name = Module.getName();
|
|
|
669 if (!Name.empty())
|
|
|
670 addString(*IMDie, dwarf::DW_AT_name, Name);
|
|
|
671
|
|
|
672 return IMDie;
|
|
|
673 }
|
|
|
674
|
|
|
675 void DwarfCompileUnit::finishSubprogramDefinition(DISubprogram SP) {
|
|
|
676 DIE *D = getDIE(SP);
|
|
|
677 if (DIE *AbsSPDIE = DU->getAbstractSPDies().lookup(SP)) {
|
|
|
678 if (D)
|
|
|
679 // If this subprogram has an abstract definition, reference that
|
|
|
680 addDIEEntry(*D, dwarf::DW_AT_abstract_origin, *AbsSPDIE);
|
|
|
681 } else {
|
|
|
682 if (!D && !includeMinimalInlineScopes())
|
|
|
683 // Lazily construct the subprogram if we didn't see either concrete or
|
|
|
684 // inlined versions during codegen. (except in -gmlt ^ where we want
|
|
|
685 // to omit these entirely)
|
|
|
686 D = getOrCreateSubprogramDIE(SP);
|
|
|
687 if (D)
|
|
|
688 // And attach the attributes
|
|
|
689 applySubprogramAttributesToDefinition(SP, *D);
|
|
|
690 }
|
|
|
691 }
|
|
|
692 void DwarfCompileUnit::collectDeadVariables(DISubprogram SP) {
|
|
|
693 assert(SP.isSubprogram() && "CU's subprogram list contains a non-subprogram");
|
|
|
694 assert(SP.isDefinition() &&
|
|
|
695 "CU's subprogram list contains a subprogram declaration");
|
|
|
696 DIArray Variables = SP.getVariables();
|
|
|
697 if (Variables.getNumElements() == 0)
|
|
|
698 return;
|
|
|
699
|
|
|
700 DIE *SPDIE = DU->getAbstractSPDies().lookup(SP);
|
|
|
701 if (!SPDIE)
|
|
|
702 SPDIE = getDIE(SP);
|
|
|
703 assert(SPDIE);
|
|
|
704 for (unsigned vi = 0, ve = Variables.getNumElements(); vi != ve; ++vi) {
|
|
|
705 DIVariable DV(Variables.getElement(vi));
|
|
|
706 assert(DV.isVariable());
|
|
|
707 DbgVariable NewVar(DV, DIExpression(), DD);
|
|
|
708 auto VariableDie = constructVariableDIE(NewVar);
|
|
|
709 applyVariableAttributes(NewVar, *VariableDie);
|
|
|
710 SPDIE->addChild(std::move(VariableDie));
|
|
|
711 }
|
|
|
712 }
|
|
|
713
|
|
|
714 void DwarfCompileUnit::emitHeader(const MCSymbol *ASectionSym) const {
|
|
|
715 // Don't bother labeling the .dwo unit, as its offset isn't used.
|
|
|
716 if (!Skeleton)
|
|
|
717 Asm->OutStreamer.EmitLabel(LabelBegin);
|
|
|
718
|
|
|
719 DwarfUnit::emitHeader(ASectionSym);
|
|
|
720 }
|
|
|
721
|
|
|
722 /// addGlobalName - Add a new global name to the compile unit.
|
|
|
723 void DwarfCompileUnit::addGlobalName(StringRef Name, DIE &Die,
|
|
|
724 DIScope Context) {
|
|
|
725 if (includeMinimalInlineScopes())
|
|
|
726 return;
|
|
|
727 std::string FullName = getParentContextString(Context) + Name.str();
|
|
|
728 GlobalNames[FullName] = &Die;
|
|
|
729 }
|
|
|
730
|
|
|
731 /// Add a new global type to the unit.
|
|
|
732 void DwarfCompileUnit::addGlobalType(DIType Ty, const DIE &Die,
|
|
|
733 DIScope Context) {
|
|
|
734 if (includeMinimalInlineScopes())
|
|
|
735 return;
|
|
|
736 std::string FullName = getParentContextString(Context) + Ty.getName().str();
|
|
|
737 GlobalTypes[FullName] = &Die;
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|
|
738 }
|
|
|
739
|
|
|
740 /// addVariableAddress - Add DW_AT_location attribute for a
|
|
|
741 /// DbgVariable based on provided MachineLocation.
|
|
|
742 void DwarfCompileUnit::addVariableAddress(const DbgVariable &DV, DIE &Die,
|
|
|
743 MachineLocation Location) {
|
|
|
744 if (DV.variableHasComplexAddress())
|
|
|
745 addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
|
|
|
746 else if (DV.isBlockByrefVariable())
|
|
|
747 addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
|
|
|
748 else
|
|
|
749 addAddress(Die, dwarf::DW_AT_location, Location);
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|
|
750 }
|
|
|
751
|
|
|
752 /// Add an address attribute to a die based on the location provided.
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|
|
753 void DwarfCompileUnit::addAddress(DIE &Die, dwarf::Attribute Attribute,
|
|
|
754 const MachineLocation &Location) {
|
|
|
755 DIELoc *Loc = new (DIEValueAllocator) DIELoc();
|
|
|
756
|
|
|
757 bool validReg;
|
|
|
758 if (Location.isReg())
|
|
|
759 validReg = addRegisterOpPiece(*Loc, Location.getReg());
|
|
|
760 else
|
|
|
761 validReg = addRegisterOffset(*Loc, Location.getReg(), Location.getOffset());
|
|
|
762
|
|
|
763 if (!validReg)
|
|
|
764 return;
|
|
|
765
|
|
|
766 // Now attach the location information to the DIE.
|
|
|
767 addBlock(Die, Attribute, Loc);
|
|
|
768 }
|
|
|
769
|
|
|
770 /// Start with the address based on the location provided, and generate the
|
|
|
771 /// DWARF information necessary to find the actual variable given the extra
|
|
|
772 /// address information encoded in the DbgVariable, starting from the starting
|
|
|
773 /// location. Add the DWARF information to the die.
|
|
|
774 void DwarfCompileUnit::addComplexAddress(const DbgVariable &DV, DIE &Die,
|
|
|
775 dwarf::Attribute Attribute,
|
|
|
776 const MachineLocation &Location) {
|
|
|
777 DIELoc *Loc = new (DIEValueAllocator) DIELoc();
|
|
|
778 DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
|
|
|
779 assert(DV.getExpression().size() == 1);
|
|
|
780 DIExpression Expr = DV.getExpression().back();
|
|
|
781 bool ValidReg;
|
|
|
782 if (Location.getOffset()) {
|
|
|
783 ValidReg = DwarfExpr.AddMachineRegIndirect(Location.getReg(),
|
|
|
784 Location.getOffset());
|
|
|
785 if (ValidReg)
|
|
|
786 DwarfExpr.AddExpression(Expr.begin(), Expr.end());
|
|
|
787 } else
|
|
|
788 ValidReg = DwarfExpr.AddMachineRegExpression(Expr, Location.getReg());
|
|
|
789
|
|
|
790 // Now attach the location information to the DIE.
|
|
|
791 if (ValidReg)
|
|
|
792 addBlock(Die, Attribute, Loc);
|
|
|
793 }
|
|
|
794
|
|
|
795 /// Add a Dwarf loclistptr attribute data and value.
|
|
|
796 void DwarfCompileUnit::addLocationList(DIE &Die, dwarf::Attribute Attribute,
|
|
|
797 unsigned Index) {
|
|
|
798 DIEValue *Value = new (DIEValueAllocator) DIELocList(Index);
|
|
|
799 dwarf::Form Form = DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
|
|
|
800 : dwarf::DW_FORM_data4;
|
|
|
801 Die.addValue(Attribute, Form, Value);
|
|
|
802 }
|
|
|
803
|
|
|
804 void DwarfCompileUnit::applyVariableAttributes(const DbgVariable &Var,
|
|
|
805 DIE &VariableDie) {
|
|
|
806 StringRef Name = Var.getName();
|
|
|
807 if (!Name.empty())
|
|
|
808 addString(VariableDie, dwarf::DW_AT_name, Name);
|
|
|
809 addSourceLine(VariableDie, Var.getVariable());
|
|
|
810 addType(VariableDie, Var.getType());
|
|
|
811 if (Var.isArtificial())
|
|
|
812 addFlag(VariableDie, dwarf::DW_AT_artificial);
|
|
|
813 }
|
|
|
814
|
|
|
815 /// Add a Dwarf expression attribute data and value.
|
|
|
816 void DwarfCompileUnit::addExpr(DIELoc &Die, dwarf::Form Form,
|
|
|
817 const MCExpr *Expr) {
|
|
|
818 DIEValue *Value = new (DIEValueAllocator) DIEExpr(Expr);
|
|
|
819 Die.addValue((dwarf::Attribute)0, Form, Value);
|
|
|
820 }
|
|
|
821
|
|
|
822 void DwarfCompileUnit::applySubprogramAttributesToDefinition(DISubprogram SP,
|
|
|
823 DIE &SPDie) {
|
|
|
824 DISubprogram SPDecl = SP.getFunctionDeclaration();
|
|
|
825 DIScope Context = resolve(SPDecl ? SPDecl.getContext() : SP.getContext());
|
|
|
826 applySubprogramAttributes(SP, SPDie, includeMinimalInlineScopes());
|
|
|
827 addGlobalName(SP.getName(), SPDie, Context);
|
|
|
828 }
|
|
|
829
|
|
|
830 bool DwarfCompileUnit::isDwoUnit() const {
|
|
|
831 return DD->useSplitDwarf() && Skeleton;
|
|
|
832 }
|
|
|
833
|
|
|
834 bool DwarfCompileUnit::includeMinimalInlineScopes() const {
|
|
|
835 return getCUNode().getEmissionKind() == DIBuilder::LineTablesOnly ||
|
|
|
836 (DD->useSplitDwarf() && !Skeleton);
|
|
|
837 }
|
|
|
838 } // end llvm namespace
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