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1 //===--- ParseTemplate.cpp - Template Parsing -----------------------------===//
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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 parsing of C++ templates.
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "clang/AST/ASTContext.h"
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14 #include "clang/AST/DeclTemplate.h"
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15 #include "clang/AST/ExprCXX.h"
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16 #include "clang/Parse/ParseDiagnostic.h"
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17 #include "clang/Parse/Parser.h"
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18 #include "clang/Parse/RAIIObjectsForParser.h"
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19 #include "clang/Sema/DeclSpec.h"
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20 #include "clang/Sema/ParsedTemplate.h"
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21 #include "clang/Sema/Scope.h"
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22 #include "llvm/Support/TimeProfiler.h"
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23 using namespace clang;
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24
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25 /// Parse a template declaration, explicit instantiation, or
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26 /// explicit specialization.
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27 Decl *Parser::ParseDeclarationStartingWithTemplate(
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28 DeclaratorContext Context, SourceLocation &DeclEnd,
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29 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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30 ObjCDeclContextSwitch ObjCDC(*this);
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31
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32 if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
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33 return ParseExplicitInstantiation(Context, SourceLocation(), ConsumeToken(),
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34 DeclEnd, AccessAttrs, AS);
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35 }
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36 return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AccessAttrs,
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37 AS);
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38 }
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39
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40 /// Parse a template declaration or an explicit specialization.
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41 ///
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42 /// Template declarations include one or more template parameter lists
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43 /// and either the function or class template declaration. Explicit
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44 /// specializations contain one or more 'template < >' prefixes
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45 /// followed by a (possibly templated) declaration. Since the
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46 /// syntactic form of both features is nearly identical, we parse all
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47 /// of the template headers together and let semantic analysis sort
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48 /// the declarations from the explicit specializations.
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49 ///
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50 /// template-declaration: [C++ temp]
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51 /// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
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52 ///
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53 /// template-declaration: [C++2a]
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54 /// template-head declaration
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55 /// template-head concept-definition
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56 ///
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57 /// TODO: requires-clause
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58 /// template-head: [C++2a]
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59 /// 'template' '<' template-parameter-list '>'
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60 /// requires-clause[opt]
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61 ///
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62 /// explicit-specialization: [ C++ temp.expl.spec]
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63 /// 'template' '<' '>' declaration
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64 Decl *Parser::ParseTemplateDeclarationOrSpecialization(
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65 DeclaratorContext Context, SourceLocation &DeclEnd,
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66 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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67 assert(Tok.isOneOf(tok::kw_export, tok::kw_template) &&
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68 "Token does not start a template declaration.");
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69
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70 // Enter template-parameter scope.
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71 ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
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72
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73 // Tell the action that names should be checked in the context of
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74 // the declaration to come.
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75 ParsingDeclRAIIObject
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76 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
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77
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78 // Parse multiple levels of template headers within this template
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79 // parameter scope, e.g.,
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80 //
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81 // template<typename T>
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82 // template<typename U>
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83 // class A<T>::B { ... };
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84 //
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85 // We parse multiple levels non-recursively so that we can build a
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86 // single data structure containing all of the template parameter
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87 // lists to easily differentiate between the case above and:
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88 //
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89 // template<typename T>
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90 // class A {
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91 // template<typename U> class B;
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92 // };
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93 //
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94 // In the first case, the action for declaring A<T>::B receives
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95 // both template parameter lists. In the second case, the action for
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96 // defining A<T>::B receives just the inner template parameter list
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97 // (and retrieves the outer template parameter list from its
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98 // context).
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99 bool isSpecialization = true;
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100 bool LastParamListWasEmpty = false;
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101 TemplateParameterLists ParamLists;
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102 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
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103
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104 do {
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105 // Consume the 'export', if any.
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106 SourceLocation ExportLoc;
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107 TryConsumeToken(tok::kw_export, ExportLoc);
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108
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109 // Consume the 'template', which should be here.
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110 SourceLocation TemplateLoc;
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111 if (!TryConsumeToken(tok::kw_template, TemplateLoc)) {
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112 Diag(Tok.getLocation(), diag::err_expected_template);
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113 return nullptr;
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114 }
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115
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116 // Parse the '<' template-parameter-list '>'
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117 SourceLocation LAngleLoc, RAngleLoc;
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118 SmallVector<NamedDecl*, 4> TemplateParams;
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119 if (ParseTemplateParameters(CurTemplateDepthTracker.getDepth(),
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120 TemplateParams, LAngleLoc, RAngleLoc)) {
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121 // Skip until the semi-colon or a '}'.
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122 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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123 TryConsumeToken(tok::semi);
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124 return nullptr;
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125 }
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126
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127 ExprResult OptionalRequiresClauseConstraintER;
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128 if (!TemplateParams.empty()) {
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129 isSpecialization = false;
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130 ++CurTemplateDepthTracker;
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131
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132 if (TryConsumeToken(tok::kw_requires)) {
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133 OptionalRequiresClauseConstraintER =
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134 Actions.CorrectDelayedTyposInExpr(
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135 ParseConstraintLogicalOrExpression(
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136 /*IsTrailingRequiresClause=*/false));
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137 if (!OptionalRequiresClauseConstraintER.isUsable()) {
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138 // Skip until the semi-colon or a '}'.
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139 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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140 TryConsumeToken(tok::semi);
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141 return nullptr;
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142 }
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143 }
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144 } else {
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145 LastParamListWasEmpty = true;
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146 }
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147
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148 ParamLists.push_back(Actions.ActOnTemplateParameterList(
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149 CurTemplateDepthTracker.getDepth(), ExportLoc, TemplateLoc, LAngleLoc,
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150 TemplateParams, RAngleLoc, OptionalRequiresClauseConstraintER.get()));
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151 } while (Tok.isOneOf(tok::kw_export, tok::kw_template));
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152
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153 unsigned NewFlags = getCurScope()->getFlags() & ~Scope::TemplateParamScope;
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154 ParseScopeFlags TemplateScopeFlags(this, NewFlags, isSpecialization);
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155
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156 // Parse the actual template declaration.
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157 if (Tok.is(tok::kw_concept))
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158 return ParseConceptDefinition(
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159 ParsedTemplateInfo(&ParamLists, isSpecialization,
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160 LastParamListWasEmpty),
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161 DeclEnd);
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162
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163 return ParseSingleDeclarationAfterTemplate(
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164 Context,
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165 ParsedTemplateInfo(&ParamLists, isSpecialization, LastParamListWasEmpty),
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166 ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
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167 }
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168
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169 /// Parse a single declaration that declares a template,
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170 /// template specialization, or explicit instantiation of a template.
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171 ///
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172 /// \param DeclEnd will receive the source location of the last token
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173 /// within this declaration.
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174 ///
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175 /// \param AS the access specifier associated with this
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176 /// declaration. Will be AS_none for namespace-scope declarations.
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177 ///
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178 /// \returns the new declaration.
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179 Decl *Parser::ParseSingleDeclarationAfterTemplate(
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180 DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo,
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181 ParsingDeclRAIIObject &DiagsFromTParams, SourceLocation &DeclEnd,
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182 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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183 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
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184 "Template information required");
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185
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186 if (Tok.is(tok::kw_static_assert)) {
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187 // A static_assert declaration may not be templated.
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188 Diag(Tok.getLocation(), diag::err_templated_invalid_declaration)
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189 << TemplateInfo.getSourceRange();
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190 // Parse the static_assert declaration to improve error recovery.
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191 return ParseStaticAssertDeclaration(DeclEnd);
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192 }
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193
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194 if (Context == DeclaratorContext::MemberContext) {
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195 // We are parsing a member template.
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196 ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
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197 &DiagsFromTParams);
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198 return nullptr;
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199 }
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200
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201 ParsedAttributesWithRange prefixAttrs(AttrFactory);
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202 MaybeParseCXX11Attributes(prefixAttrs);
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203
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204 if (Tok.is(tok::kw_using)) {
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205 auto usingDeclPtr = ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
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206 prefixAttrs);
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207 if (!usingDeclPtr || !usingDeclPtr.get().isSingleDecl())
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208 return nullptr;
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209 return usingDeclPtr.get().getSingleDecl();
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210 }
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211
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212 // Parse the declaration specifiers, stealing any diagnostics from
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213 // the template parameters.
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214 ParsingDeclSpec DS(*this, &DiagsFromTParams);
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215
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216 ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
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217 getDeclSpecContextFromDeclaratorContext(Context));
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218
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219 if (Tok.is(tok::semi)) {
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220 ProhibitAttributes(prefixAttrs);
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221 DeclEnd = ConsumeToken();
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222 RecordDecl *AnonRecord = nullptr;
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223 Decl *Decl = Actions.ParsedFreeStandingDeclSpec(
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224 getCurScope(), AS, DS,
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225 TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
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226 : MultiTemplateParamsArg(),
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227 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation,
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228 AnonRecord);
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229 assert(!AnonRecord &&
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230 "Anonymous unions/structs should not be valid with template");
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231 DS.complete(Decl);
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232 return Decl;
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233 }
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234
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235 // Move the attributes from the prefix into the DS.
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236 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
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237 ProhibitAttributes(prefixAttrs);
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238 else
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239 DS.takeAttributesFrom(prefixAttrs);
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240
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241 // Parse the declarator.
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242 ParsingDeclarator DeclaratorInfo(*this, DS, (DeclaratorContext)Context);
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243 if (TemplateInfo.TemplateParams)
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244 DeclaratorInfo.setTemplateParameterLists(*TemplateInfo.TemplateParams);
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245 ParseDeclarator(DeclaratorInfo);
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246 // Error parsing the declarator?
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247 if (!DeclaratorInfo.hasName()) {
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248 // If so, skip until the semi-colon or a }.
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249 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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250 if (Tok.is(tok::semi))
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251 ConsumeToken();
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252 return nullptr;
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253 }
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254
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255 llvm::TimeTraceScope TimeScope("ParseTemplate", [&]() {
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256 return std::string(DeclaratorInfo.getIdentifier() != nullptr
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257 ? DeclaratorInfo.getIdentifier()->getName()
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258 : "<unknown>");
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259 });
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260
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261 LateParsedAttrList LateParsedAttrs(true);
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262 if (DeclaratorInfo.isFunctionDeclarator()) {
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263 if (Tok.is(tok::kw_requires))
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264 ParseTrailingRequiresClause(DeclaratorInfo);
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265
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266 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
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267 }
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268
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269 if (DeclaratorInfo.isFunctionDeclarator() &&
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270 isStartOfFunctionDefinition(DeclaratorInfo)) {
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271
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272 // Function definitions are only allowed at file scope and in C++ classes.
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273 // The C++ inline method definition case is handled elsewhere, so we only
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274 // need to handle the file scope definition case.
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275 if (Context != DeclaratorContext::FileContext) {
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276 Diag(Tok, diag::err_function_definition_not_allowed);
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277 SkipMalformedDecl();
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278 return nullptr;
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279 }
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280
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281 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
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282 // Recover by ignoring the 'typedef'. This was probably supposed to be
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283 // the 'typename' keyword, which we should have already suggested adding
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284 // if it's appropriate.
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285 Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
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286 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
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287 DS.ClearStorageClassSpecs();
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288 }
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289
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290 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
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291 if (DeclaratorInfo.getName().getKind() !=
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292 UnqualifiedIdKind::IK_TemplateId) {
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293 // If the declarator-id is not a template-id, issue a diagnostic and
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294 // recover by ignoring the 'template' keyword.
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295 Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
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296 return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
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297 &LateParsedAttrs);
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298 } else {
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299 SourceLocation LAngleLoc
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300 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
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301 Diag(DeclaratorInfo.getIdentifierLoc(),
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302 diag::err_explicit_instantiation_with_definition)
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303 << SourceRange(TemplateInfo.TemplateLoc)
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304 << FixItHint::CreateInsertion(LAngleLoc, "<>");
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305
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306 // Recover as if it were an explicit specialization.
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307 TemplateParameterLists FakedParamLists;
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308 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
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309 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
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310 LAngleLoc, nullptr));
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311
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312 return ParseFunctionDefinition(
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313 DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
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314 /*isSpecialization=*/true,
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315 /*lastParameterListWasEmpty=*/true),
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316 &LateParsedAttrs);
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317 }
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318 }
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319 return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
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320 &LateParsedAttrs);
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321 }
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322
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323 // Parse this declaration.
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324 Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
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325 TemplateInfo);
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326
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327 if (Tok.is(tok::comma)) {
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328 Diag(Tok, diag::err_multiple_template_declarators)
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329 << (int)TemplateInfo.Kind;
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330 SkipUntil(tok::semi);
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331 return ThisDecl;
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332 }
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333
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334 // Eat the semi colon after the declaration.
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335 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
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336 if (LateParsedAttrs.size() > 0)
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337 ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
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338 DeclaratorInfo.complete(ThisDecl);
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339 return ThisDecl;
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340 }
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341
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342 /// \brief Parse a single declaration that declares a concept.
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343 ///
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344 /// \param DeclEnd will receive the source location of the last token
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345 /// within this declaration.
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346 ///
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347 /// \returns the new declaration.
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348 Decl *
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349 Parser::ParseConceptDefinition(const ParsedTemplateInfo &TemplateInfo,
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350 SourceLocation &DeclEnd) {
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351 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
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352 "Template information required");
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353 assert(Tok.is(tok::kw_concept) &&
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354 "ParseConceptDefinition must be called when at a 'concept' keyword");
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355
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356 ConsumeToken(); // Consume 'concept'
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357
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358 SourceLocation BoolKWLoc;
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359 if (TryConsumeToken(tok::kw_bool, BoolKWLoc))
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360 Diag(Tok.getLocation(), diag::ext_concept_legacy_bool_keyword) <<
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361 FixItHint::CreateRemoval(SourceLocation(BoolKWLoc));
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362
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363 DiagnoseAndSkipCXX11Attributes();
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364
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365 CXXScopeSpec SS;
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173
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366 if (ParseOptionalCXXScopeSpecifier(
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367 SS, /*ObjectType=*/nullptr,
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368 /*ObjectHadErrors=*/false, /*EnteringContext=*/false,
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369 /*MayBePseudoDestructor=*/nullptr,
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370 /*IsTypename=*/false, /*LastII=*/nullptr, /*OnlyNamespace=*/true) ||
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150
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371 SS.isInvalid()) {
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372 SkipUntil(tok::semi);
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373 return nullptr;
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374 }
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375
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376 if (SS.isNotEmpty())
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377 Diag(SS.getBeginLoc(),
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378 diag::err_concept_definition_not_identifier);
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379
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380 UnqualifiedId Result;
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173
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381 if (ParseUnqualifiedId(SS, /*ObjectType=*/nullptr,
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382 /*ObjectHadErrors=*/false, /*EnteringContext=*/false,
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150
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383 /*AllowDestructorName=*/false,
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384 /*AllowConstructorName=*/false,
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385 /*AllowDeductionGuide=*/false,
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173
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386 /*TemplateKWLoc=*/nullptr, Result)) {
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150
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387 SkipUntil(tok::semi);
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388 return nullptr;
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389 }
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390
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391 if (Result.getKind() != UnqualifiedIdKind::IK_Identifier) {
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392 Diag(Result.getBeginLoc(), diag::err_concept_definition_not_identifier);
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393 SkipUntil(tok::semi);
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394 return nullptr;
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|
|
395 }
|
|
|
396
|
|
|
397 IdentifierInfo *Id = Result.Identifier;
|
|
|
398 SourceLocation IdLoc = Result.getBeginLoc();
|
|
|
399
|
|
|
400 DiagnoseAndSkipCXX11Attributes();
|
|
|
401
|
|
|
402 if (!TryConsumeToken(tok::equal)) {
|
|
|
403 Diag(Tok.getLocation(), diag::err_expected) << tok::equal;
|
|
|
404 SkipUntil(tok::semi);
|
|
|
405 return nullptr;
|
|
|
406 }
|
|
|
407
|
|
|
408 ExprResult ConstraintExprResult =
|
|
|
409 Actions.CorrectDelayedTyposInExpr(ParseConstraintExpression());
|
|
|
410 if (ConstraintExprResult.isInvalid()) {
|
|
|
411 SkipUntil(tok::semi);
|
|
|
412 return nullptr;
|
|
|
413 }
|
|
|
414
|
|
|
415 DeclEnd = Tok.getLocation();
|
|
|
416 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
|
|
|
417 Expr *ConstraintExpr = ConstraintExprResult.get();
|
|
|
418 return Actions.ActOnConceptDefinition(getCurScope(),
|
|
|
419 *TemplateInfo.TemplateParams,
|
|
|
420 Id, IdLoc, ConstraintExpr);
|
|
|
421 }
|
|
|
422
|
|
|
423 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in
|
|
|
424 /// angle brackets. Depth is the depth of this template-parameter-list, which
|
|
|
425 /// is the number of template headers directly enclosing this template header.
|
|
|
426 /// TemplateParams is the current list of template parameters we're building.
|
|
|
427 /// The template parameter we parse will be added to this list. LAngleLoc and
|
|
|
428 /// RAngleLoc will receive the positions of the '<' and '>', respectively,
|
|
|
429 /// that enclose this template parameter list.
|
|
|
430 ///
|
|
|
431 /// \returns true if an error occurred, false otherwise.
|
|
|
432 bool Parser::ParseTemplateParameters(
|
|
|
433 unsigned Depth, SmallVectorImpl<NamedDecl *> &TemplateParams,
|
|
|
434 SourceLocation &LAngleLoc, SourceLocation &RAngleLoc) {
|
|
|
435 // Get the template parameter list.
|
|
|
436 if (!TryConsumeToken(tok::less, LAngleLoc)) {
|
|
|
437 Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
|
|
|
438 return true;
|
|
|
439 }
|
|
|
440
|
|
|
441 // Try to parse the template parameter list.
|
|
|
442 bool Failed = false;
|
|
|
443 if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater))
|
|
|
444 Failed = ParseTemplateParameterList(Depth, TemplateParams);
|
|
|
445
|
|
|
446 if (Tok.is(tok::greatergreater)) {
|
|
|
447 // No diagnostic required here: a template-parameter-list can only be
|
|
|
448 // followed by a declaration or, for a template template parameter, the
|
|
|
449 // 'class' keyword. Therefore, the second '>' will be diagnosed later.
|
|
|
450 // This matters for elegant diagnosis of:
|
|
|
451 // template<template<typename>> struct S;
|
|
|
452 Tok.setKind(tok::greater);
|
|
|
453 RAngleLoc = Tok.getLocation();
|
|
|
454 Tok.setLocation(Tok.getLocation().getLocWithOffset(1));
|
|
|
455 } else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
|
|
|
456 Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
|
|
|
457 return true;
|
|
|
458 }
|
|
|
459 return false;
|
|
|
460 }
|
|
|
461
|
|
|
462 /// ParseTemplateParameterList - Parse a template parameter list. If
|
|
|
463 /// the parsing fails badly (i.e., closing bracket was left out), this
|
|
|
464 /// will try to put the token stream in a reasonable position (closing
|
|
|
465 /// a statement, etc.) and return false.
|
|
|
466 ///
|
|
|
467 /// template-parameter-list: [C++ temp]
|
|
|
468 /// template-parameter
|
|
|
469 /// template-parameter-list ',' template-parameter
|
|
|
470 bool
|
|
|
471 Parser::ParseTemplateParameterList(const unsigned Depth,
|
|
|
472 SmallVectorImpl<NamedDecl*> &TemplateParams) {
|
|
|
473 while (1) {
|
|
|
474
|
|
|
475 if (NamedDecl *TmpParam
|
|
|
476 = ParseTemplateParameter(Depth, TemplateParams.size())) {
|
|
|
477 TemplateParams.push_back(TmpParam);
|
|
|
478 } else {
|
|
|
479 // If we failed to parse a template parameter, skip until we find
|
|
|
480 // a comma or closing brace.
|
|
|
481 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
482 StopAtSemi | StopBeforeMatch);
|
|
|
483 }
|
|
|
484
|
|
|
485 // Did we find a comma or the end of the template parameter list?
|
|
|
486 if (Tok.is(tok::comma)) {
|
|
|
487 ConsumeToken();
|
|
|
488 } else if (Tok.isOneOf(tok::greater, tok::greatergreater)) {
|
|
|
489 // Don't consume this... that's done by template parser.
|
|
|
490 break;
|
|
|
491 } else {
|
|
|
492 // Somebody probably forgot to close the template. Skip ahead and
|
|
|
493 // try to get out of the expression. This error is currently
|
|
|
494 // subsumed by whatever goes on in ParseTemplateParameter.
|
|
|
495 Diag(Tok.getLocation(), diag::err_expected_comma_greater);
|
|
|
496 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
497 StopAtSemi | StopBeforeMatch);
|
|
|
498 return false;
|
|
|
499 }
|
|
|
500 }
|
|
|
501 return true;
|
|
|
502 }
|
|
|
503
|
|
|
504 /// Determine whether the parser is at the start of a template
|
|
|
505 /// type parameter.
|
|
|
506 Parser::TPResult Parser::isStartOfTemplateTypeParameter() {
|
|
|
507 if (Tok.is(tok::kw_class)) {
|
|
|
508 // "class" may be the start of an elaborated-type-specifier or a
|
|
|
509 // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
|
|
|
510 switch (NextToken().getKind()) {
|
|
|
511 case tok::equal:
|
|
|
512 case tok::comma:
|
|
|
513 case tok::greater:
|
|
|
514 case tok::greatergreater:
|
|
|
515 case tok::ellipsis:
|
|
|
516 return TPResult::True;
|
|
|
517
|
|
|
518 case tok::identifier:
|
|
|
519 // This may be either a type-parameter or an elaborated-type-specifier.
|
|
|
520 // We have to look further.
|
|
|
521 break;
|
|
|
522
|
|
|
523 default:
|
|
|
524 return TPResult::False;
|
|
|
525 }
|
|
|
526
|
|
|
527 switch (GetLookAheadToken(2).getKind()) {
|
|
|
528 case tok::equal:
|
|
|
529 case tok::comma:
|
|
|
530 case tok::greater:
|
|
|
531 case tok::greatergreater:
|
|
|
532 return TPResult::True;
|
|
|
533
|
|
|
534 default:
|
|
|
535 return TPResult::False;
|
|
|
536 }
|
|
|
537 }
|
|
|
538
|
|
|
539 if (TryAnnotateTypeConstraint())
|
|
|
540 return TPResult::Error;
|
|
|
541
|
|
|
542 if (isTypeConstraintAnnotation() &&
|
|
|
543 // Next token might be 'auto' or 'decltype', indicating that this
|
|
|
544 // type-constraint is in fact part of a placeholder-type-specifier of a
|
|
|
545 // non-type template parameter.
|
|
|
546 !GetLookAheadToken(Tok.is(tok::annot_cxxscope) ? 2 : 1)
|
|
|
547 .isOneOf(tok::kw_auto, tok::kw_decltype))
|
|
|
548 return TPResult::True;
|
|
|
549
|
|
|
550 // 'typedef' is a reasonably-common typo/thinko for 'typename', and is
|
|
|
551 // ill-formed otherwise.
|
|
|
552 if (Tok.isNot(tok::kw_typename) && Tok.isNot(tok::kw_typedef))
|
|
|
553 return TPResult::False;
|
|
|
554
|
|
|
555 // C++ [temp.param]p2:
|
|
|
556 // There is no semantic difference between class and typename in a
|
|
|
557 // template-parameter. typename followed by an unqualified-id
|
|
|
558 // names a template type parameter. typename followed by a
|
|
|
559 // qualified-id denotes the type in a non-type
|
|
|
560 // parameter-declaration.
|
|
|
561 Token Next = NextToken();
|
|
|
562
|
|
|
563 // If we have an identifier, skip over it.
|
|
|
564 if (Next.getKind() == tok::identifier)
|
|
|
565 Next = GetLookAheadToken(2);
|
|
|
566
|
|
|
567 switch (Next.getKind()) {
|
|
|
568 case tok::equal:
|
|
|
569 case tok::comma:
|
|
|
570 case tok::greater:
|
|
|
571 case tok::greatergreater:
|
|
|
572 case tok::ellipsis:
|
|
|
573 return TPResult::True;
|
|
|
574
|
|
|
575 case tok::kw_typename:
|
|
|
576 case tok::kw_typedef:
|
|
|
577 case tok::kw_class:
|
|
|
578 // These indicate that a comma was missed after a type parameter, not that
|
|
|
579 // we have found a non-type parameter.
|
|
|
580 return TPResult::True;
|
|
|
581
|
|
|
582 default:
|
|
|
583 return TPResult::False;
|
|
|
584 }
|
|
|
585 }
|
|
|
586
|
|
|
587 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
|
|
|
588 ///
|
|
|
589 /// template-parameter: [C++ temp.param]
|
|
|
590 /// type-parameter
|
|
|
591 /// parameter-declaration
|
|
|
592 ///
|
|
|
593 /// type-parameter: (See below)
|
|
|
594 /// type-parameter-key ...[opt] identifier[opt]
|
|
|
595 /// type-parameter-key identifier[opt] = type-id
|
|
|
596 /// (C++2a) type-constraint ...[opt] identifier[opt]
|
|
|
597 /// (C++2a) type-constraint identifier[opt] = type-id
|
|
|
598 /// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
|
599 /// ...[opt] identifier[opt]
|
|
|
600 /// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
|
601 /// identifier[opt] '=' id-expression
|
|
|
602 ///
|
|
|
603 /// type-parameter-key:
|
|
|
604 /// class
|
|
|
605 /// typename
|
|
|
606 ///
|
|
|
607 NamedDecl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
|
|
|
608
|
|
|
609 switch (isStartOfTemplateTypeParameter()) {
|
|
|
610 case TPResult::True:
|
|
|
611 // Is there just a typo in the input code? ('typedef' instead of
|
|
|
612 // 'typename')
|
|
|
613 if (Tok.is(tok::kw_typedef)) {
|
|
|
614 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
|
|
|
615
|
|
|
616 Diag(Tok.getLocation(), diag::note_meant_to_use_typename)
|
|
|
617 << FixItHint::CreateReplacement(CharSourceRange::getCharRange(
|
|
|
618 Tok.getLocation(),
|
|
|
619 Tok.getEndLoc()),
|
|
|
620 "typename");
|
|
|
621
|
|
|
622 Tok.setKind(tok::kw_typename);
|
|
|
623 }
|
|
|
624
|
|
|
625 return ParseTypeParameter(Depth, Position);
|
|
|
626 case TPResult::False:
|
|
|
627 break;
|
|
|
628
|
|
|
629 case TPResult::Error: {
|
|
|
630 // We return an invalid parameter as opposed to null to avoid having bogus
|
|
|
631 // diagnostics about an empty template parameter list.
|
|
|
632 // FIXME: Fix ParseTemplateParameterList to better handle nullptr results
|
|
|
633 // from here.
|
|
|
634 // Return a NTTP as if there was an error in a scope specifier, the user
|
|
|
635 // probably meant to write the type of a NTTP.
|
|
|
636 DeclSpec DS(getAttrFactory());
|
|
|
637 DS.SetTypeSpecError();
|
|
|
638 Declarator D(DS, DeclaratorContext::TemplateParamContext);
|
|
|
639 D.SetIdentifier(nullptr, Tok.getLocation());
|
|
|
640 D.setInvalidType(true);
|
|
|
641 NamedDecl *ErrorParam = Actions.ActOnNonTypeTemplateParameter(
|
|
|
642 getCurScope(), D, Depth, Position, /*EqualLoc=*/SourceLocation(),
|
|
|
643 /*DefaultArg=*/nullptr);
|
|
|
644 ErrorParam->setInvalidDecl(true);
|
|
|
645 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
646 StopAtSemi | StopBeforeMatch);
|
|
|
647 return ErrorParam;
|
|
|
648 }
|
|
|
649
|
|
|
650 case TPResult::Ambiguous:
|
|
|
651 llvm_unreachable("template param classification can't be ambiguous");
|
|
|
652 }
|
|
|
653
|
|
|
654 if (Tok.is(tok::kw_template))
|
|
|
655 return ParseTemplateTemplateParameter(Depth, Position);
|
|
|
656
|
|
|
657 // If it's none of the above, then it must be a parameter declaration.
|
|
|
658 // NOTE: This will pick up errors in the closure of the template parameter
|
|
|
659 // list (e.g., template < ; Check here to implement >> style closures.
|
|
|
660 return ParseNonTypeTemplateParameter(Depth, Position);
|
|
|
661 }
|
|
|
662
|
|
|
663 /// Check whether the current token is a template-id annotation denoting a
|
|
|
664 /// type-constraint.
|
|
|
665 bool Parser::isTypeConstraintAnnotation() {
|
|
|
666 const Token &T = Tok.is(tok::annot_cxxscope) ? NextToken() : Tok;
|
|
|
667 if (T.isNot(tok::annot_template_id))
|
|
|
668 return false;
|
|
|
669 const auto *ExistingAnnot =
|
|
|
670 static_cast<TemplateIdAnnotation *>(T.getAnnotationValue());
|
|
|
671 return ExistingAnnot->Kind == TNK_Concept_template;
|
|
|
672 }
|
|
|
673
|
|
|
674 /// Try parsing a type-constraint at the current location.
|
|
|
675 ///
|
|
|
676 /// type-constraint:
|
|
|
677 /// nested-name-specifier[opt] concept-name
|
|
|
678 /// nested-name-specifier[opt] concept-name
|
|
|
679 /// '<' template-argument-list[opt] '>'[opt]
|
|
|
680 ///
|
|
|
681 /// \returns true if an error occurred, and false otherwise.
|
|
|
682 bool Parser::TryAnnotateTypeConstraint() {
|
|
173
|
683 if (!getLangOpts().CPlusPlus20)
|
|
150
|
684 return false;
|
|
|
685 CXXScopeSpec SS;
|
|
|
686 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
|
|
173
|
687 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
|
|
|
688 /*ObjectHadErrors=*/false,
|
|
|
689 /*EnteringContext=*/false,
|
|
|
690 /*MayBePseudoDestructor=*/nullptr,
|
|
|
691 // If this is not a type-constraint, then
|
|
|
692 // this scope-spec is part of the typename
|
|
|
693 // of a non-type template parameter
|
|
|
694 /*IsTypename=*/true, /*LastII=*/nullptr,
|
|
|
695 // We won't find concepts in
|
|
|
696 // non-namespaces anyway, so might as well
|
|
|
697 // parse this correctly for possible type
|
|
|
698 // names.
|
|
|
699 /*OnlyNamespace=*/false))
|
|
150
|
700 return true;
|
|
|
701
|
|
|
702 if (Tok.is(tok::identifier)) {
|
|
|
703 UnqualifiedId PossibleConceptName;
|
|
|
704 PossibleConceptName.setIdentifier(Tok.getIdentifierInfo(),
|
|
|
705 Tok.getLocation());
|
|
|
706
|
|
|
707 TemplateTy PossibleConcept;
|
|
|
708 bool MemberOfUnknownSpecialization = false;
|
|
|
709 auto TNK = Actions.isTemplateName(getCurScope(), SS,
|
|
|
710 /*hasTemplateKeyword=*/false,
|
|
|
711 PossibleConceptName,
|
|
|
712 /*ObjectType=*/ParsedType(),
|
|
|
713 /*EnteringContext=*/false,
|
|
|
714 PossibleConcept,
|
|
173
|
715 MemberOfUnknownSpecialization,
|
|
|
716 /*Disambiguation=*/true);
|
|
150
|
717 if (MemberOfUnknownSpecialization || !PossibleConcept ||
|
|
|
718 TNK != TNK_Concept_template) {
|
|
|
719 if (SS.isNotEmpty())
|
|
|
720 AnnotateScopeToken(SS, !WasScopeAnnotation);
|
|
|
721 return false;
|
|
|
722 }
|
|
|
723
|
|
|
724 // At this point we're sure we're dealing with a constrained parameter. It
|
|
|
725 // may or may not have a template parameter list following the concept
|
|
|
726 // name.
|
|
|
727 if (AnnotateTemplateIdToken(PossibleConcept, TNK, SS,
|
|
|
728 /*TemplateKWLoc=*/SourceLocation(),
|
|
|
729 PossibleConceptName,
|
|
|
730 /*AllowTypeAnnotation=*/false,
|
|
|
731 /*TypeConstraint=*/true))
|
|
|
732 return true;
|
|
|
733 }
|
|
|
734
|
|
|
735 if (SS.isNotEmpty())
|
|
|
736 AnnotateScopeToken(SS, !WasScopeAnnotation);
|
|
|
737 return false;
|
|
|
738 }
|
|
|
739
|
|
|
740 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
|
|
|
741 /// Other kinds of template parameters are parsed in
|
|
|
742 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
|
|
|
743 ///
|
|
|
744 /// type-parameter: [C++ temp.param]
|
|
|
745 /// 'class' ...[opt][C++0x] identifier[opt]
|
|
|
746 /// 'class' identifier[opt] '=' type-id
|
|
|
747 /// 'typename' ...[opt][C++0x] identifier[opt]
|
|
|
748 /// 'typename' identifier[opt] '=' type-id
|
|
|
749 NamedDecl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
|
|
|
750 assert((Tok.isOneOf(tok::kw_class, tok::kw_typename) ||
|
|
|
751 isTypeConstraintAnnotation()) &&
|
|
|
752 "A type-parameter starts with 'class', 'typename' or a "
|
|
|
753 "type-constraint");
|
|
|
754
|
|
|
755 CXXScopeSpec TypeConstraintSS;
|
|
|
756 TemplateIdAnnotation *TypeConstraint = nullptr;
|
|
|
757 bool TypenameKeyword = false;
|
|
|
758 SourceLocation KeyLoc;
|
|
173
|
759 ParseOptionalCXXScopeSpecifier(TypeConstraintSS, /*ObjectType=*/nullptr,
|
|
|
760 /*ObjectHadErrors=*/false,
|
|
150
|
761 /*EnteringContext*/ false);
|
|
|
762 if (Tok.is(tok::annot_template_id)) {
|
|
|
763 // Consume the 'type-constraint'.
|
|
|
764 TypeConstraint =
|
|
|
765 static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
|
|
|
766 assert(TypeConstraint->Kind == TNK_Concept_template &&
|
|
|
767 "stray non-concept template-id annotation");
|
|
|
768 KeyLoc = ConsumeAnnotationToken();
|
|
|
769 } else {
|
|
|
770 assert(TypeConstraintSS.isEmpty() &&
|
|
|
771 "expected type constraint after scope specifier");
|
|
|
772
|
|
|
773 // Consume the 'class' or 'typename' keyword.
|
|
|
774 TypenameKeyword = Tok.is(tok::kw_typename);
|
|
|
775 KeyLoc = ConsumeToken();
|
|
|
776 }
|
|
|
777
|
|
|
778 // Grab the ellipsis (if given).
|
|
|
779 SourceLocation EllipsisLoc;
|
|
|
780 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
|
|
|
781 Diag(EllipsisLoc,
|
|
|
782 getLangOpts().CPlusPlus11
|
|
|
783 ? diag::warn_cxx98_compat_variadic_templates
|
|
|
784 : diag::ext_variadic_templates);
|
|
|
785 }
|
|
|
786
|
|
|
787 // Grab the template parameter name (if given)
|
|
|
788 SourceLocation NameLoc = Tok.getLocation();
|
|
|
789 IdentifierInfo *ParamName = nullptr;
|
|
|
790 if (Tok.is(tok::identifier)) {
|
|
|
791 ParamName = Tok.getIdentifierInfo();
|
|
|
792 ConsumeToken();
|
|
|
793 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
|
|
|
794 tok::greatergreater)) {
|
|
|
795 // Unnamed template parameter. Don't have to do anything here, just
|
|
|
796 // don't consume this token.
|
|
|
797 } else {
|
|
|
798 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
|
|
|
799 return nullptr;
|
|
|
800 }
|
|
|
801
|
|
|
802 // Recover from misplaced ellipsis.
|
|
|
803 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
|
|
|
804 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
805 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
|
|
|
806
|
|
|
807 // Grab a default argument (if available).
|
|
|
808 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
|
809 // we introduce the type parameter into the local scope.
|
|
|
810 SourceLocation EqualLoc;
|
|
|
811 ParsedType DefaultArg;
|
|
|
812 if (TryConsumeToken(tok::equal, EqualLoc))
|
|
|
813 DefaultArg = ParseTypeName(/*Range=*/nullptr,
|
|
|
814 DeclaratorContext::TemplateTypeArgContext)
|
|
|
815 .get();
|
|
|
816
|
|
|
817 NamedDecl *NewDecl = Actions.ActOnTypeParameter(getCurScope(),
|
|
|
818 TypenameKeyword, EllipsisLoc,
|
|
|
819 KeyLoc, ParamName, NameLoc,
|
|
|
820 Depth, Position, EqualLoc,
|
|
|
821 DefaultArg,
|
|
|
822 TypeConstraint != nullptr);
|
|
|
823
|
|
|
824 if (TypeConstraint) {
|
|
|
825 Actions.ActOnTypeConstraint(TypeConstraintSS, TypeConstraint,
|
|
|
826 cast<TemplateTypeParmDecl>(NewDecl),
|
|
|
827 EllipsisLoc);
|
|
|
828 }
|
|
|
829
|
|
|
830 return NewDecl;
|
|
|
831 }
|
|
|
832
|
|
|
833 /// ParseTemplateTemplateParameter - Handle the parsing of template
|
|
|
834 /// template parameters.
|
|
|
835 ///
|
|
|
836 /// type-parameter: [C++ temp.param]
|
|
|
837 /// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
|
838 /// ...[opt] identifier[opt]
|
|
|
839 /// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
|
840 /// identifier[opt] = id-expression
|
|
|
841 /// type-parameter-key:
|
|
|
842 /// 'class'
|
|
|
843 /// 'typename' [C++1z]
|
|
|
844 NamedDecl *
|
|
|
845 Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
|
|
|
846 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
|
|
|
847
|
|
|
848 // Handle the template <...> part.
|
|
|
849 SourceLocation TemplateLoc = ConsumeToken();
|
|
|
850 SmallVector<NamedDecl*,8> TemplateParams;
|
|
|
851 SourceLocation LAngleLoc, RAngleLoc;
|
|
|
852 {
|
|
|
853 ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
|
|
|
854 if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
|
|
|
855 RAngleLoc)) {
|
|
|
856 return nullptr;
|
|
|
857 }
|
|
|
858 }
|
|
|
859
|
|
|
860 // Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
|
|
|
861 // Generate a meaningful error if the user forgot to put class before the
|
|
|
862 // identifier, comma, or greater. Provide a fixit if the identifier, comma,
|
|
|
863 // or greater appear immediately or after 'struct'. In the latter case,
|
|
|
864 // replace the keyword with 'class'.
|
|
|
865 if (!TryConsumeToken(tok::kw_class)) {
|
|
|
866 bool Replace = Tok.isOneOf(tok::kw_typename, tok::kw_struct);
|
|
|
867 const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
|
|
|
868 if (Tok.is(tok::kw_typename)) {
|
|
|
869 Diag(Tok.getLocation(),
|
|
|
870 getLangOpts().CPlusPlus17
|
|
|
871 ? diag::warn_cxx14_compat_template_template_param_typename
|
|
|
872 : diag::ext_template_template_param_typename)
|
|
|
873 << (!getLangOpts().CPlusPlus17
|
|
|
874 ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
|
|
|
875 : FixItHint());
|
|
|
876 } else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
|
|
|
877 tok::greatergreater, tok::ellipsis)) {
|
|
|
878 Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
|
|
|
879 << (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
|
|
|
880 : FixItHint::CreateInsertion(Tok.getLocation(), "class "));
|
|
|
881 } else
|
|
|
882 Diag(Tok.getLocation(), diag::err_class_on_template_template_param);
|
|
|
883
|
|
|
884 if (Replace)
|
|
|
885 ConsumeToken();
|
|
|
886 }
|
|
|
887
|
|
|
888 // Parse the ellipsis, if given.
|
|
|
889 SourceLocation EllipsisLoc;
|
|
|
890 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
891 Diag(EllipsisLoc,
|
|
|
892 getLangOpts().CPlusPlus11
|
|
|
893 ? diag::warn_cxx98_compat_variadic_templates
|
|
|
894 : diag::ext_variadic_templates);
|
|
|
895
|
|
|
896 // Get the identifier, if given.
|
|
|
897 SourceLocation NameLoc = Tok.getLocation();
|
|
|
898 IdentifierInfo *ParamName = nullptr;
|
|
|
899 if (Tok.is(tok::identifier)) {
|
|
|
900 ParamName = Tok.getIdentifierInfo();
|
|
|
901 ConsumeToken();
|
|
|
902 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
|
|
|
903 tok::greatergreater)) {
|
|
|
904 // Unnamed template parameter. Don't have to do anything here, just
|
|
|
905 // don't consume this token.
|
|
|
906 } else {
|
|
|
907 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
|
|
|
908 return nullptr;
|
|
|
909 }
|
|
|
910
|
|
|
911 // Recover from misplaced ellipsis.
|
|
|
912 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
|
|
|
913 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
914 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
|
|
|
915
|
|
|
916 TemplateParameterList *ParamList =
|
|
|
917 Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
|
|
|
918 TemplateLoc, LAngleLoc,
|
|
|
919 TemplateParams,
|
|
|
920 RAngleLoc, nullptr);
|
|
|
921
|
|
|
922 // Grab a default argument (if available).
|
|
|
923 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
|
924 // we introduce the template parameter into the local scope.
|
|
|
925 SourceLocation EqualLoc;
|
|
|
926 ParsedTemplateArgument DefaultArg;
|
|
|
927 if (TryConsumeToken(tok::equal, EqualLoc)) {
|
|
|
928 DefaultArg = ParseTemplateTemplateArgument();
|
|
|
929 if (DefaultArg.isInvalid()) {
|
|
|
930 Diag(Tok.getLocation(),
|
|
|
931 diag::err_default_template_template_parameter_not_template);
|
|
|
932 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
933 StopAtSemi | StopBeforeMatch);
|
|
|
934 }
|
|
|
935 }
|
|
|
936
|
|
|
937 return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
|
|
|
938 ParamList, EllipsisLoc,
|
|
|
939 ParamName, NameLoc, Depth,
|
|
|
940 Position, EqualLoc, DefaultArg);
|
|
|
941 }
|
|
|
942
|
|
|
943 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type
|
|
|
944 /// template parameters (e.g., in "template<int Size> class array;").
|
|
|
945 ///
|
|
|
946 /// template-parameter:
|
|
|
947 /// ...
|
|
|
948 /// parameter-declaration
|
|
|
949 NamedDecl *
|
|
|
950 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
|
|
|
951 // Parse the declaration-specifiers (i.e., the type).
|
|
|
952 // FIXME: The type should probably be restricted in some way... Not all
|
|
|
953 // declarators (parts of declarators?) are accepted for parameters.
|
|
|
954 DeclSpec DS(AttrFactory);
|
|
|
955 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none,
|
|
|
956 DeclSpecContext::DSC_template_param);
|
|
|
957
|
|
|
958 // Parse this as a typename.
|
|
|
959 Declarator ParamDecl(DS, DeclaratorContext::TemplateParamContext);
|
|
|
960 ParseDeclarator(ParamDecl);
|
|
|
961 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
|
|
|
962 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
|
|
|
963 return nullptr;
|
|
|
964 }
|
|
|
965
|
|
|
966 // Recover from misplaced ellipsis.
|
|
|
967 SourceLocation EllipsisLoc;
|
|
|
968 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
969 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
|
|
|
970
|
|
|
971 // If there is a default value, parse it.
|
|
|
972 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
|
973 // we introduce the template parameter into the local scope.
|
|
|
974 SourceLocation EqualLoc;
|
|
|
975 ExprResult DefaultArg;
|
|
|
976 if (TryConsumeToken(tok::equal, EqualLoc)) {
|
|
|
977 // C++ [temp.param]p15:
|
|
|
978 // When parsing a default template-argument for a non-type
|
|
|
979 // template-parameter, the first non-nested > is taken as the
|
|
|
980 // end of the template-parameter-list rather than a greater-than
|
|
|
981 // operator.
|
|
|
982 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
|
|
|
983 EnterExpressionEvaluationContext ConstantEvaluated(
|
|
|
984 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
|
|
|
985
|
|
|
986 DefaultArg = Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
|
|
|
987 if (DefaultArg.isInvalid())
|
|
|
988 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
|
|
|
989 }
|
|
|
990
|
|
|
991 // Create the parameter.
|
|
|
992 return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
|
|
173
|
993 Depth, Position, EqualLoc,
|
|
150
|
994 DefaultArg.get());
|
|
|
995 }
|
|
|
996
|
|
|
997 void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
|
|
|
998 SourceLocation CorrectLoc,
|
|
|
999 bool AlreadyHasEllipsis,
|
|
|
1000 bool IdentifierHasName) {
|
|
|
1001 FixItHint Insertion;
|
|
|
1002 if (!AlreadyHasEllipsis)
|
|
|
1003 Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
|
|
|
1004 Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
|
|
|
1005 << FixItHint::CreateRemoval(EllipsisLoc) << Insertion
|
|
|
1006 << !IdentifierHasName;
|
|
|
1007 }
|
|
|
1008
|
|
|
1009 void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
|
|
|
1010 Declarator &D) {
|
|
|
1011 assert(EllipsisLoc.isValid());
|
|
|
1012 bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
|
|
|
1013 if (!AlreadyHasEllipsis)
|
|
|
1014 D.setEllipsisLoc(EllipsisLoc);
|
|
|
1015 DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
|
|
|
1016 AlreadyHasEllipsis, D.hasName());
|
|
|
1017 }
|
|
|
1018
|
|
|
1019 /// Parses a '>' at the end of a template list.
|
|
|
1020 ///
|
|
|
1021 /// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
|
|
|
1022 /// to determine if these tokens were supposed to be a '>' followed by
|
|
|
1023 /// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
|
|
|
1024 ///
|
|
|
1025 /// \param RAngleLoc the location of the consumed '>'.
|
|
|
1026 ///
|
|
|
1027 /// \param ConsumeLastToken if true, the '>' is consumed.
|
|
|
1028 ///
|
|
|
1029 /// \param ObjCGenericList if true, this is the '>' closing an Objective-C
|
|
|
1030 /// type parameter or type argument list, rather than a C++ template parameter
|
|
|
1031 /// or argument list.
|
|
|
1032 ///
|
|
|
1033 /// \returns true, if current token does not start with '>', false otherwise.
|
|
173
|
1034 bool Parser::ParseGreaterThanInTemplateList(SourceLocation LAngleLoc,
|
|
|
1035 SourceLocation &RAngleLoc,
|
|
150
|
1036 bool ConsumeLastToken,
|
|
|
1037 bool ObjCGenericList) {
|
|
|
1038 // What will be left once we've consumed the '>'.
|
|
|
1039 tok::TokenKind RemainingToken;
|
|
|
1040 const char *ReplacementStr = "> >";
|
|
|
1041 bool MergeWithNextToken = false;
|
|
|
1042
|
|
|
1043 switch (Tok.getKind()) {
|
|
|
1044 default:
|
|
173
|
1045 Diag(getEndOfPreviousToken(), diag::err_expected) << tok::greater;
|
|
|
1046 Diag(LAngleLoc, diag::note_matching) << tok::less;
|
|
150
|
1047 return true;
|
|
|
1048
|
|
|
1049 case tok::greater:
|
|
|
1050 // Determine the location of the '>' token. Only consume this token
|
|
|
1051 // if the caller asked us to.
|
|
|
1052 RAngleLoc = Tok.getLocation();
|
|
|
1053 if (ConsumeLastToken)
|
|
|
1054 ConsumeToken();
|
|
|
1055 return false;
|
|
|
1056
|
|
|
1057 case tok::greatergreater:
|
|
|
1058 RemainingToken = tok::greater;
|
|
|
1059 break;
|
|
|
1060
|
|
|
1061 case tok::greatergreatergreater:
|
|
|
1062 RemainingToken = tok::greatergreater;
|
|
|
1063 break;
|
|
|
1064
|
|
|
1065 case tok::greaterequal:
|
|
|
1066 RemainingToken = tok::equal;
|
|
|
1067 ReplacementStr = "> =";
|
|
|
1068
|
|
|
1069 // Join two adjacent '=' tokens into one, for cases like:
|
|
|
1070 // void (*p)() = f<int>;
|
|
|
1071 // return f<int>==p;
|
|
|
1072 if (NextToken().is(tok::equal) &&
|
|
|
1073 areTokensAdjacent(Tok, NextToken())) {
|
|
|
1074 RemainingToken = tok::equalequal;
|
|
|
1075 MergeWithNextToken = true;
|
|
|
1076 }
|
|
|
1077 break;
|
|
|
1078
|
|
|
1079 case tok::greatergreaterequal:
|
|
|
1080 RemainingToken = tok::greaterequal;
|
|
|
1081 break;
|
|
|
1082 }
|
|
|
1083
|
|
|
1084 // This template-id is terminated by a token that starts with a '>'.
|
|
|
1085 // Outside C++11 and Objective-C, this is now error recovery.
|
|
|
1086 //
|
|
|
1087 // C++11 allows this when the token is '>>', and in CUDA + C++11 mode, we
|
|
|
1088 // extend that treatment to also apply to the '>>>' token.
|
|
|
1089 //
|
|
|
1090 // Objective-C allows this in its type parameter / argument lists.
|
|
|
1091
|
|
|
1092 SourceLocation TokBeforeGreaterLoc = PrevTokLocation;
|
|
|
1093 SourceLocation TokLoc = Tok.getLocation();
|
|
|
1094 Token Next = NextToken();
|
|
|
1095
|
|
|
1096 // Whether splitting the current token after the '>' would undesirably result
|
|
|
1097 // in the remaining token pasting with the token after it. This excludes the
|
|
|
1098 // MergeWithNextToken cases, which we've already handled.
|
|
|
1099 bool PreventMergeWithNextToken =
|
|
|
1100 (RemainingToken == tok::greater ||
|
|
|
1101 RemainingToken == tok::greatergreater) &&
|
|
|
1102 (Next.isOneOf(tok::greater, tok::greatergreater,
|
|
|
1103 tok::greatergreatergreater, tok::equal, tok::greaterequal,
|
|
|
1104 tok::greatergreaterequal, tok::equalequal)) &&
|
|
|
1105 areTokensAdjacent(Tok, Next);
|
|
|
1106
|
|
|
1107 // Diagnose this situation as appropriate.
|
|
|
1108 if (!ObjCGenericList) {
|
|
|
1109 // The source range of the replaced token(s).
|
|
|
1110 CharSourceRange ReplacementRange = CharSourceRange::getCharRange(
|
|
|
1111 TokLoc, Lexer::AdvanceToTokenCharacter(TokLoc, 2, PP.getSourceManager(),
|
|
|
1112 getLangOpts()));
|
|
|
1113
|
|
|
1114 // A hint to put a space between the '>>'s. In order to make the hint as
|
|
|
1115 // clear as possible, we include the characters either side of the space in
|
|
|
1116 // the replacement, rather than just inserting a space at SecondCharLoc.
|
|
|
1117 FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
|
|
|
1118 ReplacementStr);
|
|
|
1119
|
|
|
1120 // A hint to put another space after the token, if it would otherwise be
|
|
|
1121 // lexed differently.
|
|
|
1122 FixItHint Hint2;
|
|
|
1123 if (PreventMergeWithNextToken)
|
|
|
1124 Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
|
|
|
1125
|
|
|
1126 unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
|
|
|
1127 if (getLangOpts().CPlusPlus11 &&
|
|
|
1128 (Tok.is(tok::greatergreater) || Tok.is(tok::greatergreatergreater)))
|
|
|
1129 DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
|
|
|
1130 else if (Tok.is(tok::greaterequal))
|
|
|
1131 DiagId = diag::err_right_angle_bracket_equal_needs_space;
|
|
|
1132 Diag(TokLoc, DiagId) << Hint1 << Hint2;
|
|
|
1133 }
|
|
|
1134
|
|
|
1135 // Find the "length" of the resulting '>' token. This is not always 1, as it
|
|
|
1136 // can contain escaped newlines.
|
|
|
1137 unsigned GreaterLength = Lexer::getTokenPrefixLength(
|
|
|
1138 TokLoc, 1, PP.getSourceManager(), getLangOpts());
|
|
|
1139
|
|
|
1140 // Annotate the source buffer to indicate that we split the token after the
|
|
|
1141 // '>'. This allows us to properly find the end of, and extract the spelling
|
|
|
1142 // of, the '>' token later.
|
|
|
1143 RAngleLoc = PP.SplitToken(TokLoc, GreaterLength);
|
|
|
1144
|
|
|
1145 // Strip the initial '>' from the token.
|
|
|
1146 bool CachingTokens = PP.IsPreviousCachedToken(Tok);
|
|
|
1147
|
|
|
1148 Token Greater = Tok;
|
|
|
1149 Greater.setLocation(RAngleLoc);
|
|
|
1150 Greater.setKind(tok::greater);
|
|
|
1151 Greater.setLength(GreaterLength);
|
|
|
1152
|
|
|
1153 unsigned OldLength = Tok.getLength();
|
|
|
1154 if (MergeWithNextToken) {
|
|
|
1155 ConsumeToken();
|
|
|
1156 OldLength += Tok.getLength();
|
|
|
1157 }
|
|
|
1158
|
|
|
1159 Tok.setKind(RemainingToken);
|
|
|
1160 Tok.setLength(OldLength - GreaterLength);
|
|
|
1161
|
|
|
1162 // Split the second token if lexing it normally would lex a different token
|
|
|
1163 // (eg, the fifth token in 'A<B>>>' should re-lex as '>', not '>>').
|
|
|
1164 SourceLocation AfterGreaterLoc = TokLoc.getLocWithOffset(GreaterLength);
|
|
|
1165 if (PreventMergeWithNextToken)
|
|
|
1166 AfterGreaterLoc = PP.SplitToken(AfterGreaterLoc, Tok.getLength());
|
|
|
1167 Tok.setLocation(AfterGreaterLoc);
|
|
|
1168
|
|
|
1169 // Update the token cache to match what we just did if necessary.
|
|
|
1170 if (CachingTokens) {
|
|
|
1171 // If the previous cached token is being merged, delete it.
|
|
|
1172 if (MergeWithNextToken)
|
|
|
1173 PP.ReplacePreviousCachedToken({});
|
|
|
1174
|
|
|
1175 if (ConsumeLastToken)
|
|
|
1176 PP.ReplacePreviousCachedToken({Greater, Tok});
|
|
|
1177 else
|
|
|
1178 PP.ReplacePreviousCachedToken({Greater});
|
|
|
1179 }
|
|
|
1180
|
|
|
1181 if (ConsumeLastToken) {
|
|
|
1182 PrevTokLocation = RAngleLoc;
|
|
|
1183 } else {
|
|
|
1184 PrevTokLocation = TokBeforeGreaterLoc;
|
|
|
1185 PP.EnterToken(Tok, /*IsReinject=*/true);
|
|
|
1186 Tok = Greater;
|
|
|
1187 }
|
|
|
1188
|
|
|
1189 return false;
|
|
|
1190 }
|
|
|
1191
|
|
|
1192
|
|
|
1193 /// Parses a template-id that after the template name has
|
|
|
1194 /// already been parsed.
|
|
|
1195 ///
|
|
|
1196 /// This routine takes care of parsing the enclosed template argument
|
|
|
1197 /// list ('<' template-parameter-list [opt] '>') and placing the
|
|
|
1198 /// results into a form that can be transferred to semantic analysis.
|
|
|
1199 ///
|
|
|
1200 /// \param ConsumeLastToken if true, then we will consume the last
|
|
|
1201 /// token that forms the template-id. Otherwise, we will leave the
|
|
|
1202 /// last token in the stream (e.g., so that it can be replaced with an
|
|
|
1203 /// annotation token).
|
|
|
1204 bool
|
|
|
1205 Parser::ParseTemplateIdAfterTemplateName(bool ConsumeLastToken,
|
|
|
1206 SourceLocation &LAngleLoc,
|
|
|
1207 TemplateArgList &TemplateArgs,
|
|
|
1208 SourceLocation &RAngleLoc) {
|
|
|
1209 assert(Tok.is(tok::less) && "Must have already parsed the template-name");
|
|
|
1210
|
|
|
1211 // Consume the '<'.
|
|
|
1212 LAngleLoc = ConsumeToken();
|
|
|
1213
|
|
|
1214 // Parse the optional template-argument-list.
|
|
|
1215 bool Invalid = false;
|
|
|
1216 {
|
|
|
1217 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
|
|
|
1218 if (!Tok.isOneOf(tok::greater, tok::greatergreater,
|
|
|
1219 tok::greatergreatergreater, tok::greaterequal,
|
|
|
1220 tok::greatergreaterequal))
|
|
|
1221 Invalid = ParseTemplateArgumentList(TemplateArgs);
|
|
|
1222
|
|
|
1223 if (Invalid) {
|
|
|
1224 // Try to find the closing '>'.
|
|
173
|
1225 if (getLangOpts().CPlusPlus11)
|
|
|
1226 SkipUntil(tok::greater, tok::greatergreater,
|
|
|
1227 tok::greatergreatergreater, StopAtSemi | StopBeforeMatch);
|
|
150
|
1228 else
|
|
|
1229 SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
|
|
|
1230 }
|
|
|
1231 }
|
|
|
1232
|
|
173
|
1233 return ParseGreaterThanInTemplateList(LAngleLoc, RAngleLoc, ConsumeLastToken,
|
|
|
1234 /*ObjCGenericList=*/false) ||
|
|
|
1235 Invalid;
|
|
150
|
1236 }
|
|
|
1237
|
|
|
1238 /// Replace the tokens that form a simple-template-id with an
|
|
|
1239 /// annotation token containing the complete template-id.
|
|
|
1240 ///
|
|
|
1241 /// The first token in the stream must be the name of a template that
|
|
|
1242 /// is followed by a '<'. This routine will parse the complete
|
|
|
1243 /// simple-template-id and replace the tokens with a single annotation
|
|
|
1244 /// token with one of two different kinds: if the template-id names a
|
|
|
1245 /// type (and \p AllowTypeAnnotation is true), the annotation token is
|
|
|
1246 /// a type annotation that includes the optional nested-name-specifier
|
|
|
1247 /// (\p SS). Otherwise, the annotation token is a template-id
|
|
|
1248 /// annotation that does not include the optional
|
|
|
1249 /// nested-name-specifier.
|
|
|
1250 ///
|
|
|
1251 /// \param Template the declaration of the template named by the first
|
|
|
1252 /// token (an identifier), as returned from \c Action::isTemplateName().
|
|
|
1253 ///
|
|
|
1254 /// \param TNK the kind of template that \p Template
|
|
|
1255 /// refers to, as returned from \c Action::isTemplateName().
|
|
|
1256 ///
|
|
|
1257 /// \param SS if non-NULL, the nested-name-specifier that precedes
|
|
|
1258 /// this template name.
|
|
|
1259 ///
|
|
|
1260 /// \param TemplateKWLoc if valid, specifies that this template-id
|
|
|
1261 /// annotation was preceded by the 'template' keyword and gives the
|
|
|
1262 /// location of that keyword. If invalid (the default), then this
|
|
|
1263 /// template-id was not preceded by a 'template' keyword.
|
|
|
1264 ///
|
|
|
1265 /// \param AllowTypeAnnotation if true (the default), then a
|
|
|
1266 /// simple-template-id that refers to a class template, template
|
|
|
1267 /// template parameter, or other template that produces a type will be
|
|
|
1268 /// replaced with a type annotation token. Otherwise, the
|
|
|
1269 /// simple-template-id is always replaced with a template-id
|
|
|
1270 /// annotation token.
|
|
|
1271 ///
|
|
|
1272 /// \param TypeConstraint if true, then this is actually a type-constraint,
|
|
|
1273 /// meaning that the template argument list can be omitted (and the template in
|
|
|
1274 /// question must be a concept).
|
|
|
1275 ///
|
|
|
1276 /// If an unrecoverable parse error occurs and no annotation token can be
|
|
|
1277 /// formed, this function returns true.
|
|
|
1278 ///
|
|
|
1279 bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
|
|
|
1280 CXXScopeSpec &SS,
|
|
|
1281 SourceLocation TemplateKWLoc,
|
|
|
1282 UnqualifiedId &TemplateName,
|
|
|
1283 bool AllowTypeAnnotation,
|
|
|
1284 bool TypeConstraint) {
|
|
|
1285 assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++");
|
|
173
|
1286 assert((Tok.is(tok::less) || TypeConstraint) &&
|
|
150
|
1287 "Parser isn't at the beginning of a template-id");
|
|
|
1288 assert(!(TypeConstraint && AllowTypeAnnotation) && "type-constraint can't be "
|
|
|
1289 "a type annotation");
|
|
|
1290 assert((!TypeConstraint || TNK == TNK_Concept_template) && "type-constraint "
|
|
|
1291 "must accompany a concept name");
|
|
173
|
1292 assert((Template || TNK == TNK_Non_template) && "missing template name");
|
|
150
|
1293
|
|
|
1294 // Consume the template-name.
|
|
|
1295 SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
|
|
|
1296
|
|
|
1297 // Parse the enclosed template argument list.
|
|
|
1298 SourceLocation LAngleLoc, RAngleLoc;
|
|
|
1299 TemplateArgList TemplateArgs;
|
|
173
|
1300 bool ArgsInvalid = false;
|
|
150
|
1301 if (!TypeConstraint || Tok.is(tok::less)) {
|
|
173
|
1302 ArgsInvalid = ParseTemplateIdAfterTemplateName(false, LAngleLoc,
|
|
|
1303 TemplateArgs, RAngleLoc);
|
|
|
1304 // If we couldn't recover from invalid arguments, don't form an annotation
|
|
|
1305 // token -- we don't know how much to annotate.
|
|
|
1306 // FIXME: This can lead to duplicate diagnostics if we retry parsing this
|
|
|
1307 // template-id in another context. Try to annotate anyway?
|
|
|
1308 if (RAngleLoc.isInvalid())
|
|
150
|
1309 return true;
|
|
|
1310 }
|
|
|
1311
|
|
|
1312 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
|
|
|
1313
|
|
|
1314 // Build the annotation token.
|
|
|
1315 if (TNK == TNK_Type_template && AllowTypeAnnotation) {
|
|
173
|
1316 TypeResult Type = ArgsInvalid
|
|
|
1317 ? TypeError()
|
|
|
1318 : Actions.ActOnTemplateIdType(
|
|
|
1319 getCurScope(), SS, TemplateKWLoc, Template,
|
|
|
1320 TemplateName.Identifier, TemplateNameLoc,
|
|
|
1321 LAngleLoc, TemplateArgsPtr, RAngleLoc);
|
|
150
|
1322
|
|
|
1323 Tok.setKind(tok::annot_typename);
|
|
173
|
1324 setTypeAnnotation(Tok, Type);
|
|
150
|
1325 if (SS.isNotEmpty())
|
|
|
1326 Tok.setLocation(SS.getBeginLoc());
|
|
|
1327 else if (TemplateKWLoc.isValid())
|
|
|
1328 Tok.setLocation(TemplateKWLoc);
|
|
|
1329 else
|
|
|
1330 Tok.setLocation(TemplateNameLoc);
|
|
|
1331 } else {
|
|
|
1332 // Build a template-id annotation token that can be processed
|
|
|
1333 // later.
|
|
|
1334 Tok.setKind(tok::annot_template_id);
|
|
|
1335
|
|
|
1336 IdentifierInfo *TemplateII =
|
|
|
1337 TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
|
|
|
1338 ? TemplateName.Identifier
|
|
|
1339 : nullptr;
|
|
|
1340
|
|
|
1341 OverloadedOperatorKind OpKind =
|
|
|
1342 TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
|
|
|
1343 ? OO_None
|
|
|
1344 : TemplateName.OperatorFunctionId.Operator;
|
|
|
1345
|
|
|
1346 TemplateIdAnnotation *TemplateId = TemplateIdAnnotation::Create(
|
|
|
1347 TemplateKWLoc, TemplateNameLoc, TemplateII, OpKind, Template, TNK,
|
|
173
|
1348 LAngleLoc, RAngleLoc, TemplateArgs, ArgsInvalid, TemplateIds);
|
|
150
|
1349
|
|
|
1350 Tok.setAnnotationValue(TemplateId);
|
|
|
1351 if (TemplateKWLoc.isValid())
|
|
|
1352 Tok.setLocation(TemplateKWLoc);
|
|
|
1353 else
|
|
|
1354 Tok.setLocation(TemplateNameLoc);
|
|
|
1355 }
|
|
|
1356
|
|
|
1357 // Common fields for the annotation token
|
|
|
1358 Tok.setAnnotationEndLoc(RAngleLoc);
|
|
|
1359
|
|
|
1360 // In case the tokens were cached, have Preprocessor replace them with the
|
|
|
1361 // annotation token.
|
|
|
1362 PP.AnnotateCachedTokens(Tok);
|
|
|
1363 return false;
|
|
|
1364 }
|
|
|
1365
|
|
|
1366 /// Replaces a template-id annotation token with a type
|
|
|
1367 /// annotation token.
|
|
|
1368 ///
|
|
|
1369 /// If there was a failure when forming the type from the template-id,
|
|
|
1370 /// a type annotation token will still be created, but will have a
|
|
|
1371 /// NULL type pointer to signify an error.
|
|
|
1372 ///
|
|
|
1373 /// \param SS The scope specifier appearing before the template-id, if any.
|
|
|
1374 ///
|
|
|
1375 /// \param IsClassName Is this template-id appearing in a context where we
|
|
|
1376 /// know it names a class, such as in an elaborated-type-specifier or
|
|
|
1377 /// base-specifier? ('typename' and 'template' are unneeded and disallowed
|
|
|
1378 /// in those contexts.)
|
|
|
1379 void Parser::AnnotateTemplateIdTokenAsType(CXXScopeSpec &SS,
|
|
|
1380 bool IsClassName) {
|
|
|
1381 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
|
|
|
1382
|
|
|
1383 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
|
|
173
|
1384 assert(TemplateId->mightBeType() &&
|
|
150
|
1385 "Only works for type and dependent templates");
|
|
|
1386
|
|
|
1387 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
|
|
|
1388 TemplateId->NumArgs);
|
|
|
1389
|
|
173
|
1390 TypeResult Type =
|
|
|
1391 TemplateId->isInvalid()
|
|
|
1392 ? TypeError()
|
|
|
1393 : Actions.ActOnTemplateIdType(
|
|
|
1394 getCurScope(), SS, TemplateId->TemplateKWLoc,
|
|
|
1395 TemplateId->Template, TemplateId->Name,
|
|
|
1396 TemplateId->TemplateNameLoc, TemplateId->LAngleLoc,
|
|
|
1397 TemplateArgsPtr, TemplateId->RAngleLoc,
|
|
|
1398 /*IsCtorOrDtorName*/ false, IsClassName);
|
|
150
|
1399 // Create the new "type" annotation token.
|
|
|
1400 Tok.setKind(tok::annot_typename);
|
|
173
|
1401 setTypeAnnotation(Tok, Type);
|
|
150
|
1402 if (SS.isNotEmpty()) // it was a C++ qualified type name.
|
|
|
1403 Tok.setLocation(SS.getBeginLoc());
|
|
|
1404 // End location stays the same
|
|
|
1405
|
|
|
1406 // Replace the template-id annotation token, and possible the scope-specifier
|
|
|
1407 // that precedes it, with the typename annotation token.
|
|
|
1408 PP.AnnotateCachedTokens(Tok);
|
|
|
1409 }
|
|
|
1410
|
|
|
1411 /// Determine whether the given token can end a template argument.
|
|
|
1412 static bool isEndOfTemplateArgument(Token Tok) {
|
|
173
|
1413 // FIXME: Handle '>>>'.
|
|
|
1414 return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater,
|
|
|
1415 tok::greatergreatergreater);
|
|
150
|
1416 }
|
|
|
1417
|
|
|
1418 /// Parse a C++ template template argument.
|
|
|
1419 ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
|
|
|
1420 if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
|
|
|
1421 !Tok.is(tok::annot_cxxscope))
|
|
|
1422 return ParsedTemplateArgument();
|
|
|
1423
|
|
|
1424 // C++0x [temp.arg.template]p1:
|
|
|
1425 // A template-argument for a template template-parameter shall be the name
|
|
|
1426 // of a class template or an alias template, expressed as id-expression.
|
|
|
1427 //
|
|
|
1428 // We parse an id-expression that refers to a class template or alias
|
|
|
1429 // template. The grammar we parse is:
|
|
|
1430 //
|
|
|
1431 // nested-name-specifier[opt] template[opt] identifier ...[opt]
|
|
|
1432 //
|
|
|
1433 // followed by a token that terminates a template argument, such as ',',
|
|
|
1434 // '>', or (in some cases) '>>'.
|
|
|
1435 CXXScopeSpec SS; // nested-name-specifier, if present
|
|
173
|
1436 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
|
|
|
1437 /*ObjectHadErrors=*/false,
|
|
150
|
1438 /*EnteringContext=*/false);
|
|
|
1439
|
|
|
1440 ParsedTemplateArgument Result;
|
|
|
1441 SourceLocation EllipsisLoc;
|
|
|
1442 if (SS.isSet() && Tok.is(tok::kw_template)) {
|
|
|
1443 // Parse the optional 'template' keyword following the
|
|
|
1444 // nested-name-specifier.
|
|
|
1445 SourceLocation TemplateKWLoc = ConsumeToken();
|
|
|
1446
|
|
|
1447 if (Tok.is(tok::identifier)) {
|
|
|
1448 // We appear to have a dependent template name.
|
|
|
1449 UnqualifiedId Name;
|
|
|
1450 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
|
|
|
1451 ConsumeToken(); // the identifier
|
|
|
1452
|
|
|
1453 TryConsumeToken(tok::ellipsis, EllipsisLoc);
|
|
|
1454
|
|
173
|
1455 // If the next token signals the end of a template argument, then we have
|
|
|
1456 // a (possibly-dependent) template name that could be a template template
|
|
|
1457 // argument.
|
|
150
|
1458 TemplateTy Template;
|
|
|
1459 if (isEndOfTemplateArgument(Tok) &&
|
|
173
|
1460 Actions.ActOnTemplateName(getCurScope(), SS, TemplateKWLoc, Name,
|
|
|
1461 /*ObjectType=*/nullptr,
|
|
|
1462 /*EnteringContext=*/false, Template))
|
|
150
|
1463 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
|
|
|
1464 }
|
|
|
1465 } else if (Tok.is(tok::identifier)) {
|
|
|
1466 // We may have a (non-dependent) template name.
|
|
|
1467 TemplateTy Template;
|
|
|
1468 UnqualifiedId Name;
|
|
|
1469 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
|
|
|
1470 ConsumeToken(); // the identifier
|
|
|
1471
|
|
|
1472 TryConsumeToken(tok::ellipsis, EllipsisLoc);
|
|
|
1473
|
|
|
1474 if (isEndOfTemplateArgument(Tok)) {
|
|
|
1475 bool MemberOfUnknownSpecialization;
|
|
|
1476 TemplateNameKind TNK = Actions.isTemplateName(
|
|
|
1477 getCurScope(), SS,
|
|
|
1478 /*hasTemplateKeyword=*/false, Name,
|
|
|
1479 /*ObjectType=*/nullptr,
|
|
|
1480 /*EnteringContext=*/false, Template, MemberOfUnknownSpecialization);
|
|
|
1481 if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
|
|
|
1482 // We have an id-expression that refers to a class template or
|
|
|
1483 // (C++0x) alias template.
|
|
|
1484 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
|
|
|
1485 }
|
|
|
1486 }
|
|
|
1487 }
|
|
|
1488
|
|
|
1489 // If this is a pack expansion, build it as such.
|
|
|
1490 if (EllipsisLoc.isValid() && !Result.isInvalid())
|
|
|
1491 Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
|
|
|
1492
|
|
|
1493 return Result;
|
|
|
1494 }
|
|
|
1495
|
|
|
1496 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
|
|
|
1497 ///
|
|
|
1498 /// template-argument: [C++ 14.2]
|
|
|
1499 /// constant-expression
|
|
|
1500 /// type-id
|
|
|
1501 /// id-expression
|
|
|
1502 ParsedTemplateArgument Parser::ParseTemplateArgument() {
|
|
|
1503 // C++ [temp.arg]p2:
|
|
|
1504 // In a template-argument, an ambiguity between a type-id and an
|
|
|
1505 // expression is resolved to a type-id, regardless of the form of
|
|
|
1506 // the corresponding template-parameter.
|
|
|
1507 //
|
|
|
1508 // Therefore, we initially try to parse a type-id - and isCXXTypeId might look
|
|
|
1509 // up and annotate an identifier as an id-expression during disambiguation,
|
|
|
1510 // so enter the appropriate context for a constant expression template
|
|
|
1511 // argument before trying to disambiguate.
|
|
|
1512
|
|
|
1513 EnterExpressionEvaluationContext EnterConstantEvaluated(
|
|
|
1514 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated,
|
|
|
1515 /*LambdaContextDecl=*/nullptr,
|
|
|
1516 /*ExprContext=*/Sema::ExpressionEvaluationContextRecord::EK_TemplateArgument);
|
|
|
1517 if (isCXXTypeId(TypeIdAsTemplateArgument)) {
|
|
|
1518 TypeResult TypeArg = ParseTypeName(
|
|
|
1519 /*Range=*/nullptr, DeclaratorContext::TemplateArgContext);
|
|
|
1520 return Actions.ActOnTemplateTypeArgument(TypeArg);
|
|
|
1521 }
|
|
|
1522
|
|
|
1523 // Try to parse a template template argument.
|
|
|
1524 {
|
|
|
1525 TentativeParsingAction TPA(*this);
|
|
|
1526
|
|
|
1527 ParsedTemplateArgument TemplateTemplateArgument
|
|
|
1528 = ParseTemplateTemplateArgument();
|
|
|
1529 if (!TemplateTemplateArgument.isInvalid()) {
|
|
|
1530 TPA.Commit();
|
|
|
1531 return TemplateTemplateArgument;
|
|
|
1532 }
|
|
|
1533
|
|
|
1534 // Revert this tentative parse to parse a non-type template argument.
|
|
|
1535 TPA.Revert();
|
|
|
1536 }
|
|
|
1537
|
|
|
1538 // Parse a non-type template argument.
|
|
|
1539 SourceLocation Loc = Tok.getLocation();
|
|
|
1540 ExprResult ExprArg = ParseConstantExpressionInExprEvalContext(MaybeTypeCast);
|
|
|
1541 if (ExprArg.isInvalid() || !ExprArg.get()) {
|
|
|
1542 return ParsedTemplateArgument();
|
|
|
1543 }
|
|
|
1544
|
|
|
1545 return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
|
|
|
1546 ExprArg.get(), Loc);
|
|
|
1547 }
|
|
|
1548
|
|
|
1549 /// ParseTemplateArgumentList - Parse a C++ template-argument-list
|
|
|
1550 /// (C++ [temp.names]). Returns true if there was an error.
|
|
|
1551 ///
|
|
|
1552 /// template-argument-list: [C++ 14.2]
|
|
|
1553 /// template-argument
|
|
|
1554 /// template-argument-list ',' template-argument
|
|
|
1555 bool
|
|
|
1556 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
|
|
|
1557
|
|
|
1558 ColonProtectionRAIIObject ColonProtection(*this, false);
|
|
|
1559
|
|
|
1560 do {
|
|
|
1561 ParsedTemplateArgument Arg = ParseTemplateArgument();
|
|
|
1562 SourceLocation EllipsisLoc;
|
|
|
1563 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
1564 Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
|
|
|
1565
|
|
173
|
1566 if (Arg.isInvalid())
|
|
150
|
1567 return true;
|
|
|
1568
|
|
|
1569 // Save this template argument.
|
|
|
1570 TemplateArgs.push_back(Arg);
|
|
|
1571
|
|
|
1572 // If the next token is a comma, consume it and keep reading
|
|
|
1573 // arguments.
|
|
|
1574 } while (TryConsumeToken(tok::comma));
|
|
|
1575
|
|
|
1576 return false;
|
|
|
1577 }
|
|
|
1578
|
|
|
1579 /// Parse a C++ explicit template instantiation
|
|
|
1580 /// (C++ [temp.explicit]).
|
|
|
1581 ///
|
|
|
1582 /// explicit-instantiation:
|
|
|
1583 /// 'extern' [opt] 'template' declaration
|
|
|
1584 ///
|
|
|
1585 /// Note that the 'extern' is a GNU extension and C++11 feature.
|
|
|
1586 Decl *Parser::ParseExplicitInstantiation(DeclaratorContext Context,
|
|
|
1587 SourceLocation ExternLoc,
|
|
|
1588 SourceLocation TemplateLoc,
|
|
|
1589 SourceLocation &DeclEnd,
|
|
|
1590 ParsedAttributes &AccessAttrs,
|
|
|
1591 AccessSpecifier AS) {
|
|
|
1592 // This isn't really required here.
|
|
|
1593 ParsingDeclRAIIObject
|
|
|
1594 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
|
|
|
1595
|
|
|
1596 return ParseSingleDeclarationAfterTemplate(
|
|
|
1597 Context, ParsedTemplateInfo(ExternLoc, TemplateLoc),
|
|
|
1598 ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
|
|
|
1599 }
|
|
|
1600
|
|
|
1601 SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
|
|
|
1602 if (TemplateParams)
|
|
|
1603 return getTemplateParamsRange(TemplateParams->data(),
|
|
|
1604 TemplateParams->size());
|
|
|
1605
|
|
|
1606 SourceRange R(TemplateLoc);
|
|
|
1607 if (ExternLoc.isValid())
|
|
|
1608 R.setBegin(ExternLoc);
|
|
|
1609 return R;
|
|
|
1610 }
|
|
|
1611
|
|
|
1612 void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
|
|
|
1613 ((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
|
|
|
1614 }
|
|
|
1615
|
|
|
1616 /// Late parse a C++ function template in Microsoft mode.
|
|
|
1617 void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
|
|
|
1618 if (!LPT.D)
|
|
|
1619 return;
|
|
|
1620
|
|
173
|
1621 // Destroy TemplateIdAnnotations when we're done, if possible.
|
|
|
1622 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
|
|
|
1623
|
|
150
|
1624 // Get the FunctionDecl.
|
|
|
1625 FunctionDecl *FunD = LPT.D->getAsFunction();
|
|
|
1626 // Track template parameter depth.
|
|
|
1627 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
|
|
|
1628
|
|
|
1629 // To restore the context after late parsing.
|
|
|
1630 Sema::ContextRAII GlobalSavedContext(
|
|
|
1631 Actions, Actions.Context.getTranslationUnitDecl());
|
|
|
1632
|
|
|
1633 SmallVector<ParseScope*, 4> TemplateParamScopeStack;
|
|
|
1634
|
|
|
1635 // Get the list of DeclContexts to reenter. For inline methods, we only want
|
|
|
1636 // to push the DeclContext of the outermost class. This matches the way the
|
|
|
1637 // parser normally parses bodies of inline methods when the outermost class is
|
|
|
1638 // complete.
|
|
|
1639 struct ContainingDC {
|
|
|
1640 ContainingDC(DeclContext *DC, bool ShouldPush) : Pair(DC, ShouldPush) {}
|
|
|
1641 llvm::PointerIntPair<DeclContext *, 1, bool> Pair;
|
|
|
1642 DeclContext *getDC() { return Pair.getPointer(); }
|
|
|
1643 bool shouldPushDC() { return Pair.getInt(); }
|
|
|
1644 };
|
|
|
1645 SmallVector<ContainingDC, 4> DeclContextsToReenter;
|
|
|
1646 DeclContext *DD = FunD;
|
|
|
1647 DeclContext *NextContaining = Actions.getContainingDC(DD);
|
|
|
1648 while (DD && !DD->isTranslationUnit()) {
|
|
|
1649 bool ShouldPush = DD == NextContaining;
|
|
|
1650 DeclContextsToReenter.push_back({DD, ShouldPush});
|
|
|
1651 if (ShouldPush)
|
|
|
1652 NextContaining = Actions.getContainingDC(DD);
|
|
|
1653 DD = DD->getLexicalParent();
|
|
|
1654 }
|
|
|
1655
|
|
|
1656 // Reenter template scopes from outermost to innermost.
|
|
|
1657 for (ContainingDC CDC : reverse(DeclContextsToReenter)) {
|
|
|
1658 TemplateParamScopeStack.push_back(
|
|
|
1659 new ParseScope(this, Scope::TemplateParamScope));
|
|
|
1660 unsigned NumParamLists = Actions.ActOnReenterTemplateScope(
|
|
|
1661 getCurScope(), cast<Decl>(CDC.getDC()));
|
|
|
1662 CurTemplateDepthTracker.addDepth(NumParamLists);
|
|
|
1663 if (CDC.shouldPushDC()) {
|
|
|
1664 TemplateParamScopeStack.push_back(new ParseScope(this, Scope::DeclScope));
|
|
|
1665 Actions.PushDeclContext(Actions.getCurScope(), CDC.getDC());
|
|
|
1666 }
|
|
|
1667 }
|
|
|
1668
|
|
|
1669 assert(!LPT.Toks.empty() && "Empty body!");
|
|
|
1670
|
|
|
1671 // Append the current token at the end of the new token stream so that it
|
|
|
1672 // doesn't get lost.
|
|
|
1673 LPT.Toks.push_back(Tok);
|
|
|
1674 PP.EnterTokenStream(LPT.Toks, true, /*IsReinject*/true);
|
|
|
1675
|
|
|
1676 // Consume the previously pushed token.
|
|
|
1677 ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
|
|
|
1678 assert(Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&
|
|
|
1679 "Inline method not starting with '{', ':' or 'try'");
|
|
|
1680
|
|
|
1681 // Parse the method body. Function body parsing code is similar enough
|
|
|
1682 // to be re-used for method bodies as well.
|
|
|
1683 ParseScope FnScope(this, Scope::FnScope | Scope::DeclScope |
|
|
|
1684 Scope::CompoundStmtScope);
|
|
|
1685
|
|
|
1686 // Recreate the containing function DeclContext.
|
|
|
1687 Sema::ContextRAII FunctionSavedContext(Actions,
|
|
|
1688 Actions.getContainingDC(FunD));
|
|
|
1689
|
|
|
1690 Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
|
|
|
1691
|
|
|
1692 if (Tok.is(tok::kw_try)) {
|
|
|
1693 ParseFunctionTryBlock(LPT.D, FnScope);
|
|
|
1694 } else {
|
|
|
1695 if (Tok.is(tok::colon))
|
|
|
1696 ParseConstructorInitializer(LPT.D);
|
|
|
1697 else
|
|
|
1698 Actions.ActOnDefaultCtorInitializers(LPT.D);
|
|
|
1699
|
|
|
1700 if (Tok.is(tok::l_brace)) {
|
|
|
1701 assert((!isa<FunctionTemplateDecl>(LPT.D) ||
|
|
|
1702 cast<FunctionTemplateDecl>(LPT.D)
|
|
|
1703 ->getTemplateParameters()
|
|
|
1704 ->getDepth() == TemplateParameterDepth - 1) &&
|
|
|
1705 "TemplateParameterDepth should be greater than the depth of "
|
|
|
1706 "current template being instantiated!");
|
|
|
1707 ParseFunctionStatementBody(LPT.D, FnScope);
|
|
|
1708 Actions.UnmarkAsLateParsedTemplate(FunD);
|
|
|
1709 } else
|
|
|
1710 Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
|
|
|
1711 }
|
|
|
1712
|
|
|
1713 // Exit scopes.
|
|
|
1714 FnScope.Exit();
|
|
|
1715 SmallVectorImpl<ParseScope *>::reverse_iterator I =
|
|
|
1716 TemplateParamScopeStack.rbegin();
|
|
|
1717 for (; I != TemplateParamScopeStack.rend(); ++I)
|
|
|
1718 delete *I;
|
|
|
1719 }
|
|
|
1720
|
|
|
1721 /// Lex a delayed template function for late parsing.
|
|
|
1722 void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
|
|
|
1723 tok::TokenKind kind = Tok.getKind();
|
|
|
1724 if (!ConsumeAndStoreFunctionPrologue(Toks)) {
|
|
|
1725 // Consume everything up to (and including) the matching right brace.
|
|
|
1726 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
|
|
|
1727 }
|
|
|
1728
|
|
|
1729 // If we're in a function-try-block, we need to store all the catch blocks.
|
|
|
1730 if (kind == tok::kw_try) {
|
|
|
1731 while (Tok.is(tok::kw_catch)) {
|
|
|
1732 ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
|
|
|
1733 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
|
|
|
1734 }
|
|
|
1735 }
|
|
|
1736 }
|
|
|
1737
|
|
|
1738 /// We've parsed something that could plausibly be intended to be a template
|
|
|
1739 /// name (\p LHS) followed by a '<' token, and the following code can't possibly
|
|
|
1740 /// be an expression. Determine if this is likely to be a template-id and if so,
|
|
|
1741 /// diagnose it.
|
|
|
1742 bool Parser::diagnoseUnknownTemplateId(ExprResult LHS, SourceLocation Less) {
|
|
|
1743 TentativeParsingAction TPA(*this);
|
|
|
1744 // FIXME: We could look at the token sequence in a lot more detail here.
|
|
|
1745 if (SkipUntil(tok::greater, tok::greatergreater, tok::greatergreatergreater,
|
|
|
1746 StopAtSemi | StopBeforeMatch)) {
|
|
|
1747 TPA.Commit();
|
|
|
1748
|
|
|
1749 SourceLocation Greater;
|
|
173
|
1750 ParseGreaterThanInTemplateList(Less, Greater, true, false);
|
|
150
|
1751 Actions.diagnoseExprIntendedAsTemplateName(getCurScope(), LHS,
|
|
|
1752 Less, Greater);
|
|
|
1753 return true;
|
|
|
1754 }
|
|
|
1755
|
|
|
1756 // There's no matching '>' token, this probably isn't supposed to be
|
|
|
1757 // interpreted as a template-id. Parse it as an (ill-formed) comparison.
|
|
|
1758 TPA.Revert();
|
|
|
1759 return false;
|
|
|
1760 }
|
|
|
1761
|
|
|
1762 void Parser::checkPotentialAngleBracket(ExprResult &PotentialTemplateName) {
|
|
|
1763 assert(Tok.is(tok::less) && "not at a potential angle bracket");
|
|
|
1764
|
|
|
1765 bool DependentTemplateName = false;
|
|
|
1766 if (!Actions.mightBeIntendedToBeTemplateName(PotentialTemplateName,
|
|
|
1767 DependentTemplateName))
|
|
|
1768 return;
|
|
|
1769
|
|
|
1770 // OK, this might be a name that the user intended to be parsed as a
|
|
|
1771 // template-name, followed by a '<' token. Check for some easy cases.
|
|
|
1772
|
|
|
1773 // If we have potential_template<>, then it's supposed to be a template-name.
|
|
|
1774 if (NextToken().is(tok::greater) ||
|
|
|
1775 (getLangOpts().CPlusPlus11 &&
|
|
|
1776 NextToken().isOneOf(tok::greatergreater, tok::greatergreatergreater))) {
|
|
|
1777 SourceLocation Less = ConsumeToken();
|
|
|
1778 SourceLocation Greater;
|
|
173
|
1779 ParseGreaterThanInTemplateList(Less, Greater, true, false);
|
|
150
|
1780 Actions.diagnoseExprIntendedAsTemplateName(
|
|
|
1781 getCurScope(), PotentialTemplateName, Less, Greater);
|
|
|
1782 // FIXME: Perform error recovery.
|
|
|
1783 PotentialTemplateName = ExprError();
|
|
|
1784 return;
|
|
|
1785 }
|
|
|
1786
|
|
|
1787 // If we have 'potential_template<type-id', assume it's supposed to be a
|
|
|
1788 // template-name if there's a matching '>' later on.
|
|
|
1789 {
|
|
|
1790 // FIXME: Avoid the tentative parse when NextToken() can't begin a type.
|
|
|
1791 TentativeParsingAction TPA(*this);
|
|
|
1792 SourceLocation Less = ConsumeToken();
|
|
|
1793 if (isTypeIdUnambiguously() &&
|
|
|
1794 diagnoseUnknownTemplateId(PotentialTemplateName, Less)) {
|
|
|
1795 TPA.Commit();
|
|
|
1796 // FIXME: Perform error recovery.
|
|
|
1797 PotentialTemplateName = ExprError();
|
|
|
1798 return;
|
|
|
1799 }
|
|
|
1800 TPA.Revert();
|
|
|
1801 }
|
|
|
1802
|
|
|
1803 // Otherwise, remember that we saw this in case we see a potentially-matching
|
|
|
1804 // '>' token later on.
|
|
|
1805 AngleBracketTracker::Priority Priority =
|
|
|
1806 (DependentTemplateName ? AngleBracketTracker::DependentName
|
|
|
1807 : AngleBracketTracker::PotentialTypo) |
|
|
|
1808 (Tok.hasLeadingSpace() ? AngleBracketTracker::SpaceBeforeLess
|
|
|
1809 : AngleBracketTracker::NoSpaceBeforeLess);
|
|
|
1810 AngleBrackets.add(*this, PotentialTemplateName.get(), Tok.getLocation(),
|
|
|
1811 Priority);
|
|
|
1812 }
|
|
|
1813
|
|
|
1814 bool Parser::checkPotentialAngleBracketDelimiter(
|
|
|
1815 const AngleBracketTracker::Loc &LAngle, const Token &OpToken) {
|
|
|
1816 // If a comma in an expression context is followed by a type that can be a
|
|
|
1817 // template argument and cannot be an expression, then this is ill-formed,
|
|
|
1818 // but might be intended to be part of a template-id.
|
|
|
1819 if (OpToken.is(tok::comma) && isTypeIdUnambiguously() &&
|
|
|
1820 diagnoseUnknownTemplateId(LAngle.TemplateName, LAngle.LessLoc)) {
|
|
|
1821 AngleBrackets.clear(*this);
|
|
|
1822 return true;
|
|
|
1823 }
|
|
|
1824
|
|
|
1825 // If a context that looks like a template-id is followed by '()', then
|
|
|
1826 // this is ill-formed, but might be intended to be a template-id
|
|
|
1827 // followed by '()'.
|
|
|
1828 if (OpToken.is(tok::greater) && Tok.is(tok::l_paren) &&
|
|
|
1829 NextToken().is(tok::r_paren)) {
|
|
|
1830 Actions.diagnoseExprIntendedAsTemplateName(
|
|
|
1831 getCurScope(), LAngle.TemplateName, LAngle.LessLoc,
|
|
|
1832 OpToken.getLocation());
|
|
|
1833 AngleBrackets.clear(*this);
|
|
|
1834 return true;
|
|
|
1835 }
|
|
|
1836
|
|
|
1837 // After a '>' (etc), we're no longer potentially in a construct that's
|
|
|
1838 // intended to be treated as a template-id.
|
|
|
1839 if (OpToken.is(tok::greater) ||
|
|
|
1840 (getLangOpts().CPlusPlus11 &&
|
|
|
1841 OpToken.isOneOf(tok::greatergreater, tok::greatergreatergreater)))
|
|
|
1842 AngleBrackets.clear(*this);
|
|
|
1843 return false;
|
|
|
1844 }
|
