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150
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1 //===- TemplateBase.cpp - Common template AST class implementation --------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file implements common classes used throughout C++ template
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10 // representations.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "clang/AST/TemplateBase.h"
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15 #include "clang/AST/ASTContext.h"
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16 #include "clang/AST/Decl.h"
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17 #include "clang/AST/DeclBase.h"
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18 #include "clang/AST/DeclTemplate.h"
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173
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19 #include "clang/AST/DependenceFlags.h"
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150
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20 #include "clang/AST/Expr.h"
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21 #include "clang/AST/ExprCXX.h"
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22 #include "clang/AST/PrettyPrinter.h"
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23 #include "clang/AST/TemplateName.h"
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24 #include "clang/AST/Type.h"
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25 #include "clang/AST/TypeLoc.h"
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26 #include "clang/Basic/Diagnostic.h"
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27 #include "clang/Basic/LLVM.h"
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28 #include "clang/Basic/LangOptions.h"
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29 #include "clang/Basic/SourceLocation.h"
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30 #include "llvm/ADT/APSInt.h"
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31 #include "llvm/ADT/FoldingSet.h"
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32 #include "llvm/ADT/None.h"
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33 #include "llvm/ADT/SmallString.h"
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34 #include "llvm/ADT/StringRef.h"
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35 #include "llvm/Support/Casting.h"
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36 #include "llvm/Support/Compiler.h"
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37 #include "llvm/Support/ErrorHandling.h"
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38 #include "llvm/Support/raw_ostream.h"
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39 #include <cassert>
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40 #include <cstddef>
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41 #include <cstdint>
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42 #include <cstring>
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43
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44 using namespace clang;
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45
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46 /// Print a template integral argument value.
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47 ///
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48 /// \param TemplArg the TemplateArgument instance to print.
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49 ///
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50 /// \param Out the raw_ostream instance to use for printing.
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51 ///
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52 /// \param Policy the printing policy for EnumConstantDecl printing.
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53 static void printIntegral(const TemplateArgument &TemplArg,
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54 raw_ostream &Out, const PrintingPolicy& Policy) {
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55 const Type *T = TemplArg.getIntegralType().getTypePtr();
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56 const llvm::APSInt &Val = TemplArg.getAsIntegral();
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57
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58 if (const EnumType *ET = T->getAs<EnumType>()) {
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59 for (const EnumConstantDecl* ECD : ET->getDecl()->enumerators()) {
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60 // In Sema::CheckTemplateArugment, enum template arguments value are
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61 // extended to the size of the integer underlying the enum type. This
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62 // may create a size difference between the enum value and template
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63 // argument value, requiring isSameValue here instead of operator==.
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64 if (llvm::APSInt::isSameValue(ECD->getInitVal(), Val)) {
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65 ECD->printQualifiedName(Out, Policy);
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66 return;
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67 }
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68 }
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69 }
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70
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71 if (T->isBooleanType() && !Policy.MSVCFormatting) {
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72 Out << (Val.getBoolValue() ? "true" : "false");
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73 } else if (T->isCharType()) {
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74 const char Ch = Val.getZExtValue();
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75 Out << ((Ch == '\'') ? "'\\" : "'");
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76 Out.write_escaped(StringRef(&Ch, 1), /*UseHexEscapes=*/ true);
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77 Out << "'";
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78 } else {
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79 Out << Val;
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80 }
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81 }
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82
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83 //===----------------------------------------------------------------------===//
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84 // TemplateArgument Implementation
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85 //===----------------------------------------------------------------------===//
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86
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87 TemplateArgument::TemplateArgument(ASTContext &Ctx, const llvm::APSInt &Value,
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88 QualType Type) {
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89 Integer.Kind = Integral;
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90 // Copy the APSInt value into our decomposed form.
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91 Integer.BitWidth = Value.getBitWidth();
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92 Integer.IsUnsigned = Value.isUnsigned();
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93 // If the value is large, we have to get additional memory from the ASTContext
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94 unsigned NumWords = Value.getNumWords();
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95 if (NumWords > 1) {
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96 void *Mem = Ctx.Allocate(NumWords * sizeof(uint64_t));
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97 std::memcpy(Mem, Value.getRawData(), NumWords * sizeof(uint64_t));
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98 Integer.pVal = static_cast<uint64_t *>(Mem);
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99 } else {
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100 Integer.VAL = Value.getZExtValue();
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101 }
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102
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103 Integer.Type = Type.getAsOpaquePtr();
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104 }
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105
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106 TemplateArgument
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107 TemplateArgument::CreatePackCopy(ASTContext &Context,
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108 ArrayRef<TemplateArgument> Args) {
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109 if (Args.empty())
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110 return getEmptyPack();
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111
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112 return TemplateArgument(Args.copy(Context));
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113 }
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114
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173
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115 TemplateArgumentDependence TemplateArgument::getDependence() const {
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116 auto Deps = TemplateArgumentDependence::None;
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150
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117 switch (getKind()) {
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118 case Null:
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119 llvm_unreachable("Should not have a NULL template argument");
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120
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121 case Type:
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173
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122 Deps = toTemplateArgumentDependence(getAsType()->getDependence());
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123 if (isa<PackExpansionType>(getAsType()))
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124 Deps |= TemplateArgumentDependence::Dependent;
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125 return Deps;
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150
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126
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127 case Template:
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173
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128 return toTemplateArgumentDependence(getAsTemplate().getDependence());
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150
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129
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130 case TemplateExpansion:
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173
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131 return TemplateArgumentDependence::Dependent |
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132 TemplateArgumentDependence::Instantiation;
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150
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133
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173
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134 case Declaration: {
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135 auto *DC = dyn_cast<DeclContext>(getAsDecl());
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136 if (!DC)
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137 DC = getAsDecl()->getDeclContext();
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138 if (DC->isDependentContext())
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139 Deps = TemplateArgumentDependence::Dependent |
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140 TemplateArgumentDependence::Instantiation;
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141 return Deps;
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142 }
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150
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143
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144 case NullPtr:
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145 case Integral:
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173
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146 return TemplateArgumentDependence::None;
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150
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147
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148 case Expression:
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173
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149 Deps = toTemplateArgumentDependence(getAsExpr()->getDependence());
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150 if (isa<PackExpansionExpr>(getAsExpr()))
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151 Deps |= TemplateArgumentDependence::Dependent |
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152 TemplateArgumentDependence::Instantiation;
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153 return Deps;
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150
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154
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155 case Pack:
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156 for (const auto &P : pack_elements())
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173
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157 Deps |= P.getDependence();
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158 return Deps;
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150
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159 }
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173
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160 llvm_unreachable("unhandled ArgKind");
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161 }
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150
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162
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173
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163 bool TemplateArgument::isDependent() const {
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164 return getDependence() & TemplateArgumentDependence::Dependent;
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150
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165 }
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166
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167 bool TemplateArgument::isInstantiationDependent() const {
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173
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168 return getDependence() & TemplateArgumentDependence::Instantiation;
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150
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169 }
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170
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171 bool TemplateArgument::isPackExpansion() const {
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172 switch (getKind()) {
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173 case Null:
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174 case Declaration:
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175 case Integral:
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176 case Pack:
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177 case Template:
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178 case NullPtr:
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179 return false;
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180
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181 case TemplateExpansion:
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182 return true;
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183
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184 case Type:
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185 return isa<PackExpansionType>(getAsType());
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186
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187 case Expression:
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188 return isa<PackExpansionExpr>(getAsExpr());
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189 }
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190
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191 llvm_unreachable("Invalid TemplateArgument Kind!");
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192 }
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193
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194 bool TemplateArgument::containsUnexpandedParameterPack() const {
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173
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195 return getDependence() & TemplateArgumentDependence::UnexpandedPack;
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150
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196 }
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197
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198 Optional<unsigned> TemplateArgument::getNumTemplateExpansions() const {
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199 assert(getKind() == TemplateExpansion);
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200 if (TemplateArg.NumExpansions)
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201 return TemplateArg.NumExpansions - 1;
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202
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203 return None;
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204 }
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205
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206 QualType TemplateArgument::getNonTypeTemplateArgumentType() const {
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207 switch (getKind()) {
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208 case TemplateArgument::Null:
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209 case TemplateArgument::Type:
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210 case TemplateArgument::Template:
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211 case TemplateArgument::TemplateExpansion:
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212 case TemplateArgument::Pack:
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213 return QualType();
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214
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215 case TemplateArgument::Integral:
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216 return getIntegralType();
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217
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218 case TemplateArgument::Expression:
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219 return getAsExpr()->getType();
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220
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221 case TemplateArgument::Declaration:
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222 return getParamTypeForDecl();
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223
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224 case TemplateArgument::NullPtr:
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225 return getNullPtrType();
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226 }
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227
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228 llvm_unreachable("Invalid TemplateArgument Kind!");
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229 }
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230
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231 void TemplateArgument::Profile(llvm::FoldingSetNodeID &ID,
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232 const ASTContext &Context) const {
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233 ID.AddInteger(getKind());
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234 switch (getKind()) {
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235 case Null:
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236 break;
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237
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238 case Type:
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239 getAsType().Profile(ID);
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240 break;
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241
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242 case NullPtr:
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243 getNullPtrType().Profile(ID);
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244 break;
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245
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246 case Declaration:
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247 ID.AddPointer(getAsDecl()? getAsDecl()->getCanonicalDecl() : nullptr);
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248 break;
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249
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250 case Template:
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251 case TemplateExpansion: {
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252 TemplateName Template = getAsTemplateOrTemplatePattern();
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253 if (TemplateTemplateParmDecl *TTP
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254 = dyn_cast_or_null<TemplateTemplateParmDecl>(
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255 Template.getAsTemplateDecl())) {
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256 ID.AddBoolean(true);
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257 ID.AddInteger(TTP->getDepth());
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258 ID.AddInteger(TTP->getPosition());
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259 ID.AddBoolean(TTP->isParameterPack());
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260 } else {
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261 ID.AddBoolean(false);
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262 ID.AddPointer(Context.getCanonicalTemplateName(Template)
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263 .getAsVoidPointer());
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264 }
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265 break;
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266 }
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267
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268 case Integral:
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269 getAsIntegral().Profile(ID);
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270 getIntegralType().Profile(ID);
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271 break;
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272
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273 case Expression:
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274 getAsExpr()->Profile(ID, Context, true);
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275 break;
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276
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277 case Pack:
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278 ID.AddInteger(Args.NumArgs);
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279 for (unsigned I = 0; I != Args.NumArgs; ++I)
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280 Args.Args[I].Profile(ID, Context);
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281 }
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282 }
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283
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284 bool TemplateArgument::structurallyEquals(const TemplateArgument &Other) const {
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285 if (getKind() != Other.getKind()) return false;
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286
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287 switch (getKind()) {
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288 case Null:
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289 case Type:
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290 case Expression:
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291 case Template:
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292 case TemplateExpansion:
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293 case NullPtr:
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294 return TypeOrValue.V == Other.TypeOrValue.V;
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295
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296 case Declaration:
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297 return getAsDecl() == Other.getAsDecl();
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298
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299 case Integral:
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300 return getIntegralType() == Other.getIntegralType() &&
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301 getAsIntegral() == Other.getAsIntegral();
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302
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303 case Pack:
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304 if (Args.NumArgs != Other.Args.NumArgs) return false;
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305 for (unsigned I = 0, E = Args.NumArgs; I != E; ++I)
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306 if (!Args.Args[I].structurallyEquals(Other.Args.Args[I]))
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307 return false;
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308 return true;
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309 }
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310
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311 llvm_unreachable("Invalid TemplateArgument Kind!");
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312 }
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313
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314 TemplateArgument TemplateArgument::getPackExpansionPattern() const {
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315 assert(isPackExpansion());
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316
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317 switch (getKind()) {
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318 case Type:
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319 return getAsType()->castAs<PackExpansionType>()->getPattern();
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320
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321 case Expression:
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322 return cast<PackExpansionExpr>(getAsExpr())->getPattern();
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323
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324 case TemplateExpansion:
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325 return TemplateArgument(getAsTemplateOrTemplatePattern());
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326
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327 case Declaration:
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328 case Integral:
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329 case Pack:
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330 case Null:
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331 case Template:
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332 case NullPtr:
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333 return TemplateArgument();
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334 }
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335
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336 llvm_unreachable("Invalid TemplateArgument Kind!");
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337 }
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338
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339 void TemplateArgument::print(const PrintingPolicy &Policy,
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340 raw_ostream &Out) const {
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341 switch (getKind()) {
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342 case Null:
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343 Out << "(no value)";
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344 break;
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345
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346 case Type: {
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347 PrintingPolicy SubPolicy(Policy);
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348 SubPolicy.SuppressStrongLifetime = true;
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349 getAsType().print(Out, SubPolicy);
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350 break;
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351 }
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352
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353 case Declaration: {
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354 NamedDecl *ND = getAsDecl();
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173
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355 if (!getParamTypeForDecl()->isReferenceType())
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356 Out << '&';
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357 ND->printQualifiedName(Out);
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150
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358 break;
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359 }
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360
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361 case NullPtr:
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362 Out << "nullptr";
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363 break;
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364
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365 case Template:
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366 getAsTemplate().print(Out, Policy);
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367 break;
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368
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369 case TemplateExpansion:
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370 getAsTemplateOrTemplatePattern().print(Out, Policy);
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371 Out << "...";
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372 break;
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373
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374 case Integral:
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375 printIntegral(*this, Out, Policy);
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376 break;
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377
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378 case Expression:
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379 getAsExpr()->printPretty(Out, nullptr, Policy);
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380 break;
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381
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382 case Pack:
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383 Out << "<";
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384 bool First = true;
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385 for (const auto &P : pack_elements()) {
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386 if (First)
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387 First = false;
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388 else
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389 Out << ", ";
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390
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391 P.print(Policy, Out);
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392 }
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393 Out << ">";
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394 break;
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395 }
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396 }
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397
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398 void TemplateArgument::dump(raw_ostream &Out) const {
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399 LangOptions LO; // FIXME! see also TemplateName::dump().
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400 LO.CPlusPlus = true;
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401 LO.Bool = true;
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402 print(PrintingPolicy(LO), Out);
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403 }
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404
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405 LLVM_DUMP_METHOD void TemplateArgument::dump() const { dump(llvm::errs()); }
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406
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407 //===----------------------------------------------------------------------===//
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408 // TemplateArgumentLoc Implementation
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409 //===----------------------------------------------------------------------===//
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410
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411 SourceRange TemplateArgumentLoc::getSourceRange() const {
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412 switch (Argument.getKind()) {
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413 case TemplateArgument::Expression:
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414 return getSourceExpression()->getSourceRange();
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415
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416 case TemplateArgument::Declaration:
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417 return getSourceDeclExpression()->getSourceRange();
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418
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419 case TemplateArgument::NullPtr:
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420 return getSourceNullPtrExpression()->getSourceRange();
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421
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422 case TemplateArgument::Type:
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423 if (TypeSourceInfo *TSI = getTypeSourceInfo())
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424 return TSI->getTypeLoc().getSourceRange();
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425 else
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426 return SourceRange();
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427
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428 case TemplateArgument::Template:
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429 if (getTemplateQualifierLoc())
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430 return SourceRange(getTemplateQualifierLoc().getBeginLoc(),
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431 getTemplateNameLoc());
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432 return SourceRange(getTemplateNameLoc());
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433
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434 case TemplateArgument::TemplateExpansion:
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435 if (getTemplateQualifierLoc())
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436 return SourceRange(getTemplateQualifierLoc().getBeginLoc(),
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437 getTemplateEllipsisLoc());
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438 return SourceRange(getTemplateNameLoc(), getTemplateEllipsisLoc());
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439
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440 case TemplateArgument::Integral:
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441 return getSourceIntegralExpression()->getSourceRange();
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442
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443 case TemplateArgument::Pack:
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444 case TemplateArgument::Null:
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445 return SourceRange();
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446 }
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447
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448 llvm_unreachable("Invalid TemplateArgument Kind!");
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449 }
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450
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451 const DiagnosticBuilder &clang::operator<<(const DiagnosticBuilder &DB,
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452 const TemplateArgument &Arg) {
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453 switch (Arg.getKind()) {
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454 case TemplateArgument::Null:
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455 // This is bad, but not as bad as crashing because of argument
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456 // count mismatches.
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457 return DB << "(null template argument)";
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458
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459 case TemplateArgument::Type:
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460 return DB << Arg.getAsType();
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461
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462 case TemplateArgument::Declaration:
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463 return DB << Arg.getAsDecl();
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464
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465 case TemplateArgument::NullPtr:
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466 return DB << "nullptr";
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467
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468 case TemplateArgument::Integral:
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469 return DB << Arg.getAsIntegral().toString(10);
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470
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471 case TemplateArgument::Template:
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472 return DB << Arg.getAsTemplate();
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473
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474 case TemplateArgument::TemplateExpansion:
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475 return DB << Arg.getAsTemplateOrTemplatePattern() << "...";
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476
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477 case TemplateArgument::Expression: {
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478 // This shouldn't actually ever happen, so it's okay that we're
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479 // regurgitating an expression here.
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480 // FIXME: We're guessing at LangOptions!
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481 SmallString<32> Str;
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482 llvm::raw_svector_ostream OS(Str);
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483 LangOptions LangOpts;
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484 LangOpts.CPlusPlus = true;
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485 PrintingPolicy Policy(LangOpts);
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486 Arg.getAsExpr()->printPretty(OS, nullptr, Policy);
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487 return DB << OS.str();
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488 }
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489
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490 case TemplateArgument::Pack: {
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|
491 // FIXME: We're guessing at LangOptions!
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|
|
492 SmallString<32> Str;
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|
|
493 llvm::raw_svector_ostream OS(Str);
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|
|
494 LangOptions LangOpts;
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|
|
495 LangOpts.CPlusPlus = true;
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|
496 PrintingPolicy Policy(LangOpts);
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|
497 Arg.print(Policy, OS);
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498 return DB << OS.str();
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499 }
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|
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500 }
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501
|
|
|
502 llvm_unreachable("Invalid TemplateArgument Kind!");
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|
|
503 }
|
|
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504
|
|
|
505 const ASTTemplateArgumentListInfo *
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|
|
506 ASTTemplateArgumentListInfo::Create(const ASTContext &C,
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|
|
507 const TemplateArgumentListInfo &List) {
|
|
|
508 std::size_t size = totalSizeToAlloc<TemplateArgumentLoc>(List.size());
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|
|
509 void *Mem = C.Allocate(size, alignof(ASTTemplateArgumentListInfo));
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|
|
510 return new (Mem) ASTTemplateArgumentListInfo(List);
|
|
|
511 }
|
|
|
512
|
|
|
513 ASTTemplateArgumentListInfo::ASTTemplateArgumentListInfo(
|
|
|
514 const TemplateArgumentListInfo &Info) {
|
|
|
515 LAngleLoc = Info.getLAngleLoc();
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|
|
516 RAngleLoc = Info.getRAngleLoc();
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|
|
517 NumTemplateArgs = Info.size();
|
|
|
518
|
|
|
519 TemplateArgumentLoc *ArgBuffer = getTrailingObjects<TemplateArgumentLoc>();
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|
|
520 for (unsigned i = 0; i != NumTemplateArgs; ++i)
|
|
|
521 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]);
|
|
|
522 }
|
|
|
523
|
|
|
524 void ASTTemplateKWAndArgsInfo::initializeFrom(
|
|
|
525 SourceLocation TemplateKWLoc, const TemplateArgumentListInfo &Info,
|
|
|
526 TemplateArgumentLoc *OutArgArray) {
|
|
|
527 this->TemplateKWLoc = TemplateKWLoc;
|
|
|
528 LAngleLoc = Info.getLAngleLoc();
|
|
|
529 RAngleLoc = Info.getRAngleLoc();
|
|
|
530 NumTemplateArgs = Info.size();
|
|
|
531
|
|
|
532 for (unsigned i = 0; i != NumTemplateArgs; ++i)
|
|
|
533 new (&OutArgArray[i]) TemplateArgumentLoc(Info[i]);
|
|
|
534 }
|
|
|
535
|
|
|
536 void ASTTemplateKWAndArgsInfo::initializeFrom(SourceLocation TemplateKWLoc) {
|
|
|
537 assert(TemplateKWLoc.isValid());
|
|
|
538 LAngleLoc = SourceLocation();
|
|
|
539 RAngleLoc = SourceLocation();
|
|
|
540 this->TemplateKWLoc = TemplateKWLoc;
|
|
|
541 NumTemplateArgs = 0;
|
|
|
542 }
|
|
|
543
|
|
|
544 void ASTTemplateKWAndArgsInfo::initializeFrom(
|
|
|
545 SourceLocation TemplateKWLoc, const TemplateArgumentListInfo &Info,
|
|
173
|
546 TemplateArgumentLoc *OutArgArray, TemplateArgumentDependence &Deps) {
|
|
150
|
547 this->TemplateKWLoc = TemplateKWLoc;
|
|
|
548 LAngleLoc = Info.getLAngleLoc();
|
|
|
549 RAngleLoc = Info.getRAngleLoc();
|
|
|
550 NumTemplateArgs = Info.size();
|
|
|
551
|
|
|
552 for (unsigned i = 0; i != NumTemplateArgs; ++i) {
|
|
173
|
553 Deps |= Info[i].getArgument().getDependence();
|
|
150
|
554
|
|
|
555 new (&OutArgArray[i]) TemplateArgumentLoc(Info[i]);
|
|
|
556 }
|
|
|
557 }
|
|
|
558
|
|
|
559 void ASTTemplateKWAndArgsInfo::copyInto(const TemplateArgumentLoc *ArgArray,
|
|
|
560 TemplateArgumentListInfo &Info) const {
|
|
|
561 Info.setLAngleLoc(LAngleLoc);
|
|
|
562 Info.setRAngleLoc(RAngleLoc);
|
|
|
563 for (unsigned I = 0; I != NumTemplateArgs; ++I)
|
|
|
564 Info.addArgument(ArgArray[I]);
|
|
|
565 }
|
