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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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236
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22 #include "clang/Sema/SemaDiagnostic.h"
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150
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23 #include "llvm/Support/TimeProfiler.h"
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24 using namespace clang;
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25
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221
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26 /// Re-enter a possible template scope, creating as many template parameter
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27 /// scopes as necessary.
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28 /// \return The number of template parameter scopes entered.
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29 unsigned Parser::ReenterTemplateScopes(MultiParseScope &S, Decl *D) {
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30 return Actions.ActOnReenterTemplateScope(D, [&] {
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31 S.Enter(Scope::TemplateParamScope);
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32 return Actions.getCurScope();
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33 });
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34 }
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35
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150
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36 /// Parse a template declaration, explicit instantiation, or
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37 /// explicit specialization.
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38 Decl *Parser::ParseDeclarationStartingWithTemplate(
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39 DeclaratorContext Context, SourceLocation &DeclEnd,
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40 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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41 ObjCDeclContextSwitch ObjCDC(*this);
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42
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43 if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
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44 return ParseExplicitInstantiation(Context, SourceLocation(), ConsumeToken(),
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45 DeclEnd, AccessAttrs, AS);
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46 }
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47 return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AccessAttrs,
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48 AS);
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49 }
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50
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51 /// Parse a template declaration or an explicit specialization.
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52 ///
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53 /// Template declarations include one or more template parameter lists
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54 /// and either the function or class template declaration. Explicit
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55 /// specializations contain one or more 'template < >' prefixes
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56 /// followed by a (possibly templated) declaration. Since the
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57 /// syntactic form of both features is nearly identical, we parse all
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58 /// of the template headers together and let semantic analysis sort
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59 /// the declarations from the explicit specializations.
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60 ///
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61 /// template-declaration: [C++ temp]
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62 /// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
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63 ///
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64 /// template-declaration: [C++2a]
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65 /// template-head declaration
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66 /// template-head concept-definition
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67 ///
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68 /// TODO: requires-clause
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69 /// template-head: [C++2a]
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70 /// 'template' '<' template-parameter-list '>'
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71 /// requires-clause[opt]
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72 ///
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73 /// explicit-specialization: [ C++ temp.expl.spec]
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74 /// 'template' '<' '>' declaration
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75 Decl *Parser::ParseTemplateDeclarationOrSpecialization(
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76 DeclaratorContext Context, SourceLocation &DeclEnd,
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77 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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78 assert(Tok.isOneOf(tok::kw_export, tok::kw_template) &&
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79 "Token does not start a template declaration.");
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80
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221
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81 MultiParseScope TemplateParamScopes(*this);
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150
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82
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83 // Tell the action that names should be checked in the context of
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84 // the declaration to come.
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85 ParsingDeclRAIIObject
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86 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
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87
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88 // Parse multiple levels of template headers within this template
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89 // parameter scope, e.g.,
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90 //
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91 // template<typename T>
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92 // template<typename U>
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93 // class A<T>::B { ... };
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94 //
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95 // We parse multiple levels non-recursively so that we can build a
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96 // single data structure containing all of the template parameter
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97 // lists to easily differentiate between the case above and:
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98 //
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99 // template<typename T>
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100 // class A {
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101 // template<typename U> class B;
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102 // };
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103 //
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104 // In the first case, the action for declaring A<T>::B receives
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105 // both template parameter lists. In the second case, the action for
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106 // defining A<T>::B receives just the inner template parameter list
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107 // (and retrieves the outer template parameter list from its
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108 // context).
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109 bool isSpecialization = true;
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110 bool LastParamListWasEmpty = false;
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111 TemplateParameterLists ParamLists;
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112 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
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113
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114 do {
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115 // Consume the 'export', if any.
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116 SourceLocation ExportLoc;
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117 TryConsumeToken(tok::kw_export, ExportLoc);
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118
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119 // Consume the 'template', which should be here.
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120 SourceLocation TemplateLoc;
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121 if (!TryConsumeToken(tok::kw_template, TemplateLoc)) {
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122 Diag(Tok.getLocation(), diag::err_expected_template);
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123 return nullptr;
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124 }
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125
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126 // Parse the '<' template-parameter-list '>'
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127 SourceLocation LAngleLoc, RAngleLoc;
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128 SmallVector<NamedDecl*, 4> TemplateParams;
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221
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129 if (ParseTemplateParameters(TemplateParamScopes,
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130 CurTemplateDepthTracker.getDepth(),
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150
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131 TemplateParams, LAngleLoc, RAngleLoc)) {
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132 // Skip until the semi-colon or a '}'.
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133 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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134 TryConsumeToken(tok::semi);
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135 return nullptr;
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136 }
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137
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138 ExprResult OptionalRequiresClauseConstraintER;
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139 if (!TemplateParams.empty()) {
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140 isSpecialization = false;
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141 ++CurTemplateDepthTracker;
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142
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143 if (TryConsumeToken(tok::kw_requires)) {
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144 OptionalRequiresClauseConstraintER =
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221
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145 Actions.ActOnRequiresClause(ParseConstraintLogicalOrExpression(
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146 /*IsTrailingRequiresClause=*/false));
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150
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147 if (!OptionalRequiresClauseConstraintER.isUsable()) {
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148 // Skip until the semi-colon or a '}'.
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149 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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150 TryConsumeToken(tok::semi);
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151 return nullptr;
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152 }
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153 }
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154 } else {
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155 LastParamListWasEmpty = true;
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156 }
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157
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158 ParamLists.push_back(Actions.ActOnTemplateParameterList(
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159 CurTemplateDepthTracker.getDepth(), ExportLoc, TemplateLoc, LAngleLoc,
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160 TemplateParams, RAngleLoc, OptionalRequiresClauseConstraintER.get()));
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161 } while (Tok.isOneOf(tok::kw_export, tok::kw_template));
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162
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163 // Parse the actual template declaration.
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164 if (Tok.is(tok::kw_concept))
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165 return ParseConceptDefinition(
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166 ParsedTemplateInfo(&ParamLists, isSpecialization,
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167 LastParamListWasEmpty),
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168 DeclEnd);
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169
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170 return ParseSingleDeclarationAfterTemplate(
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171 Context,
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172 ParsedTemplateInfo(&ParamLists, isSpecialization, LastParamListWasEmpty),
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173 ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
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174 }
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175
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176 /// Parse a single declaration that declares a template,
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177 /// template specialization, or explicit instantiation of a template.
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178 ///
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179 /// \param DeclEnd will receive the source location of the last token
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180 /// within this declaration.
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181 ///
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182 /// \param AS the access specifier associated with this
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183 /// declaration. Will be AS_none for namespace-scope declarations.
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184 ///
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185 /// \returns the new declaration.
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186 Decl *Parser::ParseSingleDeclarationAfterTemplate(
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187 DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo,
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188 ParsingDeclRAIIObject &DiagsFromTParams, SourceLocation &DeclEnd,
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189 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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190 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
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191 "Template information required");
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192
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193 if (Tok.is(tok::kw_static_assert)) {
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194 // A static_assert declaration may not be templated.
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195 Diag(Tok.getLocation(), diag::err_templated_invalid_declaration)
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196 << TemplateInfo.getSourceRange();
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197 // Parse the static_assert declaration to improve error recovery.
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198 return ParseStaticAssertDeclaration(DeclEnd);
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199 }
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200
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221
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201 if (Context == DeclaratorContext::Member) {
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150
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202 // We are parsing a member template.
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236
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203 DeclGroupPtrTy D = ParseCXXClassMemberDeclaration(
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204 AS, AccessAttrs, TemplateInfo, &DiagsFromTParams);
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205
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206 if (!D || !D.get().isSingleDecl())
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207 return nullptr;
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208 return D.get().getSingleDecl();
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150
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209 }
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210
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236
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211 ParsedAttributes prefixAttrs(AttrFactory);
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150
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212 MaybeParseCXX11Attributes(prefixAttrs);
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213
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214 if (Tok.is(tok::kw_using)) {
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215 auto usingDeclPtr = ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
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216 prefixAttrs);
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217 if (!usingDeclPtr || !usingDeclPtr.get().isSingleDecl())
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218 return nullptr;
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219 return usingDeclPtr.get().getSingleDecl();
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220 }
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221
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222 // Parse the declaration specifiers, stealing any diagnostics from
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223 // the template parameters.
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224 ParsingDeclSpec DS(*this, &DiagsFromTParams);
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225
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226 ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
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227 getDeclSpecContextFromDeclaratorContext(Context));
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228
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229 if (Tok.is(tok::semi)) {
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230 ProhibitAttributes(prefixAttrs);
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231 DeclEnd = ConsumeToken();
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232 RecordDecl *AnonRecord = nullptr;
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233 Decl *Decl = Actions.ParsedFreeStandingDeclSpec(
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236
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234 getCurScope(), AS, DS, ParsedAttributesView::none(),
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150
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235 TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
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236 : MultiTemplateParamsArg(),
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237 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation,
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238 AnonRecord);
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239 assert(!AnonRecord &&
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240 "Anonymous unions/structs should not be valid with template");
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241 DS.complete(Decl);
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242 return Decl;
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243 }
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244
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245 // Move the attributes from the prefix into the DS.
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246 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
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247 ProhibitAttributes(prefixAttrs);
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248
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249 // Parse the declarator.
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236
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250 ParsingDeclarator DeclaratorInfo(*this, DS, prefixAttrs,
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251 (DeclaratorContext)Context);
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150
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252 if (TemplateInfo.TemplateParams)
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253 DeclaratorInfo.setTemplateParameterLists(*TemplateInfo.TemplateParams);
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236
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254
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255 // Turn off usual access checking for template specializations and
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256 // instantiations.
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257 // C++20 [temp.spec] 13.9/6.
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258 // This disables the access checking rules for function template explicit
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259 // instantiation and explicit specialization:
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260 // - parameter-list;
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261 // - template-argument-list;
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262 // - noexcept-specifier;
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263 // - dynamic-exception-specifications (deprecated in C++11, removed since
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264 // C++17).
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265 bool IsTemplateSpecOrInst =
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266 (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
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267 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
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268 SuppressAccessChecks SAC(*this, IsTemplateSpecOrInst);
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269
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150
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270 ParseDeclarator(DeclaratorInfo);
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236
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271
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272 if (IsTemplateSpecOrInst)
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273 SAC.done();
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274
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150
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275 // Error parsing the declarator?
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276 if (!DeclaratorInfo.hasName()) {
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277 // If so, skip until the semi-colon or a }.
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278 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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279 if (Tok.is(tok::semi))
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280 ConsumeToken();
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281 return nullptr;
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282 }
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283
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284 llvm::TimeTraceScope TimeScope("ParseTemplate", [&]() {
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285 return std::string(DeclaratorInfo.getIdentifier() != nullptr
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286 ? DeclaratorInfo.getIdentifier()->getName()
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287 : "<unknown>");
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288 });
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289
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290 LateParsedAttrList LateParsedAttrs(true);
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291 if (DeclaratorInfo.isFunctionDeclarator()) {
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236
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292 if (Tok.is(tok::kw_requires)) {
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293 CXXScopeSpec &ScopeSpec = DeclaratorInfo.getCXXScopeSpec();
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294 DeclaratorScopeObj DeclScopeObj(*this, ScopeSpec);
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295 if (ScopeSpec.isValid() &&
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296 Actions.ShouldEnterDeclaratorScope(getCurScope(), ScopeSpec))
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297 DeclScopeObj.EnterDeclaratorScope();
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150
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298 ParseTrailingRequiresClause(DeclaratorInfo);
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236
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299 }
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150
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300
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301 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
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302 }
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303
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304 if (DeclaratorInfo.isFunctionDeclarator() &&
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305 isStartOfFunctionDefinition(DeclaratorInfo)) {
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306
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307 // Function definitions are only allowed at file scope and in C++ classes.
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308 // The C++ inline method definition case is handled elsewhere, so we only
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309 // need to handle the file scope definition case.
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221
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310 if (Context != DeclaratorContext::File) {
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150
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311 Diag(Tok, diag::err_function_definition_not_allowed);
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312 SkipMalformedDecl();
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313 return nullptr;
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314 }
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315
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316 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
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317 // Recover by ignoring the 'typedef'. This was probably supposed to be
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318 // the 'typename' keyword, which we should have already suggested adding
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319 // if it's appropriate.
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320 Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
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321 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
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322 DS.ClearStorageClassSpecs();
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323 }
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324
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325 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
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326 if (DeclaratorInfo.getName().getKind() !=
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327 UnqualifiedIdKind::IK_TemplateId) {
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328 // If the declarator-id is not a template-id, issue a diagnostic and
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329 // recover by ignoring the 'template' keyword.
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330 Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
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331 return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
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332 &LateParsedAttrs);
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333 } else {
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334 SourceLocation LAngleLoc
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335 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
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336 Diag(DeclaratorInfo.getIdentifierLoc(),
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337 diag::err_explicit_instantiation_with_definition)
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338 << SourceRange(TemplateInfo.TemplateLoc)
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339 << FixItHint::CreateInsertion(LAngleLoc, "<>");
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340
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341 // Recover as if it were an explicit specialization.
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342 TemplateParameterLists FakedParamLists;
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343 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
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344 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
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345 LAngleLoc, nullptr));
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346
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347 return ParseFunctionDefinition(
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348 DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
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349 /*isSpecialization=*/true,
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350 /*lastParameterListWasEmpty=*/true),
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351 &LateParsedAttrs);
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352 }
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353 }
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354 return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
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355 &LateParsedAttrs);
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356 }
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357
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358 // Parse this declaration.
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359 Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
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360 TemplateInfo);
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361
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362 if (Tok.is(tok::comma)) {
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363 Diag(Tok, diag::err_multiple_template_declarators)
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364 << (int)TemplateInfo.Kind;
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365 SkipUntil(tok::semi);
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366 return ThisDecl;
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367 }
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368
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369 // Eat the semi colon after the declaration.
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370 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
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371 if (LateParsedAttrs.size() > 0)
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372 ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
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373 DeclaratorInfo.complete(ThisDecl);
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374 return ThisDecl;
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375 }
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376
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377 /// \brief Parse a single declaration that declares a concept.
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378 ///
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379 /// \param DeclEnd will receive the source location of the last token
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380 /// within this declaration.
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381 ///
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382 /// \returns the new declaration.
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383 Decl *
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384 Parser::ParseConceptDefinition(const ParsedTemplateInfo &TemplateInfo,
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385 SourceLocation &DeclEnd) {
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386 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
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387 "Template information required");
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388 assert(Tok.is(tok::kw_concept) &&
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389 "ParseConceptDefinition must be called when at a 'concept' keyword");
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390
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391 ConsumeToken(); // Consume 'concept'
|
|
|
392
|
|
|
393 SourceLocation BoolKWLoc;
|
|
|
394 if (TryConsumeToken(tok::kw_bool, BoolKWLoc))
|
|
|
395 Diag(Tok.getLocation(), diag::ext_concept_legacy_bool_keyword) <<
|
|
|
396 FixItHint::CreateRemoval(SourceLocation(BoolKWLoc));
|
|
|
397
|
|
|
398 DiagnoseAndSkipCXX11Attributes();
|
|
|
399
|
|
|
400 CXXScopeSpec SS;
|
|
173
|
401 if (ParseOptionalCXXScopeSpecifier(
|
|
|
402 SS, /*ObjectType=*/nullptr,
|
|
236
|
403 /*ObjectHasErrors=*/false, /*EnteringContext=*/false,
|
|
173
|
404 /*MayBePseudoDestructor=*/nullptr,
|
|
|
405 /*IsTypename=*/false, /*LastII=*/nullptr, /*OnlyNamespace=*/true) ||
|
|
150
|
406 SS.isInvalid()) {
|
|
|
407 SkipUntil(tok::semi);
|
|
|
408 return nullptr;
|
|
|
409 }
|
|
|
410
|
|
|
411 if (SS.isNotEmpty())
|
|
|
412 Diag(SS.getBeginLoc(),
|
|
|
413 diag::err_concept_definition_not_identifier);
|
|
|
414
|
|
|
415 UnqualifiedId Result;
|
|
173
|
416 if (ParseUnqualifiedId(SS, /*ObjectType=*/nullptr,
|
|
|
417 /*ObjectHadErrors=*/false, /*EnteringContext=*/false,
|
|
150
|
418 /*AllowDestructorName=*/false,
|
|
|
419 /*AllowConstructorName=*/false,
|
|
|
420 /*AllowDeductionGuide=*/false,
|
|
173
|
421 /*TemplateKWLoc=*/nullptr, Result)) {
|
|
150
|
422 SkipUntil(tok::semi);
|
|
|
423 return nullptr;
|
|
|
424 }
|
|
|
425
|
|
|
426 if (Result.getKind() != UnqualifiedIdKind::IK_Identifier) {
|
|
|
427 Diag(Result.getBeginLoc(), diag::err_concept_definition_not_identifier);
|
|
|
428 SkipUntil(tok::semi);
|
|
|
429 return nullptr;
|
|
|
430 }
|
|
|
431
|
|
|
432 IdentifierInfo *Id = Result.Identifier;
|
|
|
433 SourceLocation IdLoc = Result.getBeginLoc();
|
|
|
434
|
|
|
435 DiagnoseAndSkipCXX11Attributes();
|
|
|
436
|
|
|
437 if (!TryConsumeToken(tok::equal)) {
|
|
|
438 Diag(Tok.getLocation(), diag::err_expected) << tok::equal;
|
|
|
439 SkipUntil(tok::semi);
|
|
|
440 return nullptr;
|
|
|
441 }
|
|
|
442
|
|
|
443 ExprResult ConstraintExprResult =
|
|
|
444 Actions.CorrectDelayedTyposInExpr(ParseConstraintExpression());
|
|
|
445 if (ConstraintExprResult.isInvalid()) {
|
|
|
446 SkipUntil(tok::semi);
|
|
|
447 return nullptr;
|
|
|
448 }
|
|
|
449
|
|
|
450 DeclEnd = Tok.getLocation();
|
|
|
451 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
|
|
|
452 Expr *ConstraintExpr = ConstraintExprResult.get();
|
|
|
453 return Actions.ActOnConceptDefinition(getCurScope(),
|
|
|
454 *TemplateInfo.TemplateParams,
|
|
|
455 Id, IdLoc, ConstraintExpr);
|
|
|
456 }
|
|
|
457
|
|
|
458 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in
|
|
|
459 /// angle brackets. Depth is the depth of this template-parameter-list, which
|
|
|
460 /// is the number of template headers directly enclosing this template header.
|
|
|
461 /// TemplateParams is the current list of template parameters we're building.
|
|
|
462 /// The template parameter we parse will be added to this list. LAngleLoc and
|
|
|
463 /// RAngleLoc will receive the positions of the '<' and '>', respectively,
|
|
|
464 /// that enclose this template parameter list.
|
|
|
465 ///
|
|
|
466 /// \returns true if an error occurred, false otherwise.
|
|
|
467 bool Parser::ParseTemplateParameters(
|
|
221
|
468 MultiParseScope &TemplateScopes, unsigned Depth,
|
|
|
469 SmallVectorImpl<NamedDecl *> &TemplateParams, SourceLocation &LAngleLoc,
|
|
|
470 SourceLocation &RAngleLoc) {
|
|
150
|
471 // Get the template parameter list.
|
|
|
472 if (!TryConsumeToken(tok::less, LAngleLoc)) {
|
|
|
473 Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
|
|
|
474 return true;
|
|
|
475 }
|
|
|
476
|
|
|
477 // Try to parse the template parameter list.
|
|
|
478 bool Failed = false;
|
|
221
|
479 // FIXME: Missing greatergreatergreater support.
|
|
|
480 if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater)) {
|
|
|
481 TemplateScopes.Enter(Scope::TemplateParamScope);
|
|
150
|
482 Failed = ParseTemplateParameterList(Depth, TemplateParams);
|
|
221
|
483 }
|
|
150
|
484
|
|
|
485 if (Tok.is(tok::greatergreater)) {
|
|
|
486 // No diagnostic required here: a template-parameter-list can only be
|
|
|
487 // followed by a declaration or, for a template template parameter, the
|
|
|
488 // 'class' keyword. Therefore, the second '>' will be diagnosed later.
|
|
|
489 // This matters for elegant diagnosis of:
|
|
|
490 // template<template<typename>> struct S;
|
|
|
491 Tok.setKind(tok::greater);
|
|
|
492 RAngleLoc = Tok.getLocation();
|
|
|
493 Tok.setLocation(Tok.getLocation().getLocWithOffset(1));
|
|
|
494 } else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
|
|
|
495 Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
|
|
|
496 return true;
|
|
|
497 }
|
|
|
498 return false;
|
|
|
499 }
|
|
|
500
|
|
|
501 /// ParseTemplateParameterList - Parse a template parameter list. If
|
|
|
502 /// the parsing fails badly (i.e., closing bracket was left out), this
|
|
|
503 /// will try to put the token stream in a reasonable position (closing
|
|
|
504 /// a statement, etc.) and return false.
|
|
|
505 ///
|
|
|
506 /// template-parameter-list: [C++ temp]
|
|
|
507 /// template-parameter
|
|
|
508 /// template-parameter-list ',' template-parameter
|
|
|
509 bool
|
|
|
510 Parser::ParseTemplateParameterList(const unsigned Depth,
|
|
|
511 SmallVectorImpl<NamedDecl*> &TemplateParams) {
|
|
236
|
512 while (true) {
|
|
150
|
513
|
|
|
514 if (NamedDecl *TmpParam
|
|
|
515 = ParseTemplateParameter(Depth, TemplateParams.size())) {
|
|
|
516 TemplateParams.push_back(TmpParam);
|
|
|
517 } else {
|
|
|
518 // If we failed to parse a template parameter, skip until we find
|
|
|
519 // a comma or closing brace.
|
|
|
520 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
521 StopAtSemi | StopBeforeMatch);
|
|
|
522 }
|
|
|
523
|
|
|
524 // Did we find a comma or the end of the template parameter list?
|
|
|
525 if (Tok.is(tok::comma)) {
|
|
|
526 ConsumeToken();
|
|
|
527 } else if (Tok.isOneOf(tok::greater, tok::greatergreater)) {
|
|
|
528 // Don't consume this... that's done by template parser.
|
|
|
529 break;
|
|
|
530 } else {
|
|
|
531 // Somebody probably forgot to close the template. Skip ahead and
|
|
|
532 // try to get out of the expression. This error is currently
|
|
|
533 // subsumed by whatever goes on in ParseTemplateParameter.
|
|
|
534 Diag(Tok.getLocation(), diag::err_expected_comma_greater);
|
|
|
535 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
536 StopAtSemi | StopBeforeMatch);
|
|
|
537 return false;
|
|
|
538 }
|
|
|
539 }
|
|
|
540 return true;
|
|
|
541 }
|
|
|
542
|
|
|
543 /// Determine whether the parser is at the start of a template
|
|
|
544 /// type parameter.
|
|
|
545 Parser::TPResult Parser::isStartOfTemplateTypeParameter() {
|
|
|
546 if (Tok.is(tok::kw_class)) {
|
|
|
547 // "class" may be the start of an elaborated-type-specifier or a
|
|
|
548 // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
|
|
|
549 switch (NextToken().getKind()) {
|
|
|
550 case tok::equal:
|
|
|
551 case tok::comma:
|
|
|
552 case tok::greater:
|
|
|
553 case tok::greatergreater:
|
|
|
554 case tok::ellipsis:
|
|
|
555 return TPResult::True;
|
|
|
556
|
|
|
557 case tok::identifier:
|
|
|
558 // This may be either a type-parameter or an elaborated-type-specifier.
|
|
|
559 // We have to look further.
|
|
|
560 break;
|
|
|
561
|
|
|
562 default:
|
|
|
563 return TPResult::False;
|
|
|
564 }
|
|
|
565
|
|
|
566 switch (GetLookAheadToken(2).getKind()) {
|
|
|
567 case tok::equal:
|
|
|
568 case tok::comma:
|
|
|
569 case tok::greater:
|
|
|
570 case tok::greatergreater:
|
|
|
571 return TPResult::True;
|
|
|
572
|
|
|
573 default:
|
|
|
574 return TPResult::False;
|
|
|
575 }
|
|
|
576 }
|
|
|
577
|
|
|
578 if (TryAnnotateTypeConstraint())
|
|
|
579 return TPResult::Error;
|
|
|
580
|
|
|
581 if (isTypeConstraintAnnotation() &&
|
|
|
582 // Next token might be 'auto' or 'decltype', indicating that this
|
|
|
583 // type-constraint is in fact part of a placeholder-type-specifier of a
|
|
|
584 // non-type template parameter.
|
|
|
585 !GetLookAheadToken(Tok.is(tok::annot_cxxscope) ? 2 : 1)
|
|
|
586 .isOneOf(tok::kw_auto, tok::kw_decltype))
|
|
|
587 return TPResult::True;
|
|
|
588
|
|
|
589 // 'typedef' is a reasonably-common typo/thinko for 'typename', and is
|
|
|
590 // ill-formed otherwise.
|
|
|
591 if (Tok.isNot(tok::kw_typename) && Tok.isNot(tok::kw_typedef))
|
|
|
592 return TPResult::False;
|
|
|
593
|
|
|
594 // C++ [temp.param]p2:
|
|
|
595 // There is no semantic difference between class and typename in a
|
|
|
596 // template-parameter. typename followed by an unqualified-id
|
|
|
597 // names a template type parameter. typename followed by a
|
|
|
598 // qualified-id denotes the type in a non-type
|
|
|
599 // parameter-declaration.
|
|
|
600 Token Next = NextToken();
|
|
|
601
|
|
|
602 // If we have an identifier, skip over it.
|
|
|
603 if (Next.getKind() == tok::identifier)
|
|
|
604 Next = GetLookAheadToken(2);
|
|
|
605
|
|
|
606 switch (Next.getKind()) {
|
|
|
607 case tok::equal:
|
|
|
608 case tok::comma:
|
|
|
609 case tok::greater:
|
|
|
610 case tok::greatergreater:
|
|
|
611 case tok::ellipsis:
|
|
|
612 return TPResult::True;
|
|
|
613
|
|
|
614 case tok::kw_typename:
|
|
|
615 case tok::kw_typedef:
|
|
|
616 case tok::kw_class:
|
|
|
617 // These indicate that a comma was missed after a type parameter, not that
|
|
|
618 // we have found a non-type parameter.
|
|
|
619 return TPResult::True;
|
|
|
620
|
|
|
621 default:
|
|
|
622 return TPResult::False;
|
|
|
623 }
|
|
|
624 }
|
|
|
625
|
|
|
626 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
|
|
|
627 ///
|
|
|
628 /// template-parameter: [C++ temp.param]
|
|
|
629 /// type-parameter
|
|
|
630 /// parameter-declaration
|
|
|
631 ///
|
|
|
632 /// type-parameter: (See below)
|
|
|
633 /// type-parameter-key ...[opt] identifier[opt]
|
|
|
634 /// type-parameter-key identifier[opt] = type-id
|
|
|
635 /// (C++2a) type-constraint ...[opt] identifier[opt]
|
|
|
636 /// (C++2a) type-constraint identifier[opt] = type-id
|
|
|
637 /// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
|
638 /// ...[opt] identifier[opt]
|
|
|
639 /// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
|
640 /// identifier[opt] '=' id-expression
|
|
|
641 ///
|
|
|
642 /// type-parameter-key:
|
|
|
643 /// class
|
|
|
644 /// typename
|
|
|
645 ///
|
|
|
646 NamedDecl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
|
|
|
647
|
|
|
648 switch (isStartOfTemplateTypeParameter()) {
|
|
|
649 case TPResult::True:
|
|
|
650 // Is there just a typo in the input code? ('typedef' instead of
|
|
|
651 // 'typename')
|
|
|
652 if (Tok.is(tok::kw_typedef)) {
|
|
|
653 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
|
|
|
654
|
|
|
655 Diag(Tok.getLocation(), diag::note_meant_to_use_typename)
|
|
|
656 << FixItHint::CreateReplacement(CharSourceRange::getCharRange(
|
|
|
657 Tok.getLocation(),
|
|
|
658 Tok.getEndLoc()),
|
|
|
659 "typename");
|
|
|
660
|
|
|
661 Tok.setKind(tok::kw_typename);
|
|
|
662 }
|
|
|
663
|
|
|
664 return ParseTypeParameter(Depth, Position);
|
|
|
665 case TPResult::False:
|
|
|
666 break;
|
|
|
667
|
|
|
668 case TPResult::Error: {
|
|
|
669 // We return an invalid parameter as opposed to null to avoid having bogus
|
|
|
670 // diagnostics about an empty template parameter list.
|
|
|
671 // FIXME: Fix ParseTemplateParameterList to better handle nullptr results
|
|
|
672 // from here.
|
|
|
673 // Return a NTTP as if there was an error in a scope specifier, the user
|
|
|
674 // probably meant to write the type of a NTTP.
|
|
|
675 DeclSpec DS(getAttrFactory());
|
|
|
676 DS.SetTypeSpecError();
|
|
236
|
677 Declarator D(DS, ParsedAttributesView::none(),
|
|
|
678 DeclaratorContext::TemplateParam);
|
|
150
|
679 D.SetIdentifier(nullptr, Tok.getLocation());
|
|
|
680 D.setInvalidType(true);
|
|
|
681 NamedDecl *ErrorParam = Actions.ActOnNonTypeTemplateParameter(
|
|
|
682 getCurScope(), D, Depth, Position, /*EqualLoc=*/SourceLocation(),
|
|
|
683 /*DefaultArg=*/nullptr);
|
|
|
684 ErrorParam->setInvalidDecl(true);
|
|
|
685 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
686 StopAtSemi | StopBeforeMatch);
|
|
|
687 return ErrorParam;
|
|
|
688 }
|
|
|
689
|
|
|
690 case TPResult::Ambiguous:
|
|
|
691 llvm_unreachable("template param classification can't be ambiguous");
|
|
|
692 }
|
|
|
693
|
|
|
694 if (Tok.is(tok::kw_template))
|
|
|
695 return ParseTemplateTemplateParameter(Depth, Position);
|
|
|
696
|
|
|
697 // If it's none of the above, then it must be a parameter declaration.
|
|
|
698 // NOTE: This will pick up errors in the closure of the template parameter
|
|
|
699 // list (e.g., template < ; Check here to implement >> style closures.
|
|
|
700 return ParseNonTypeTemplateParameter(Depth, Position);
|
|
|
701 }
|
|
|
702
|
|
|
703 /// Check whether the current token is a template-id annotation denoting a
|
|
|
704 /// type-constraint.
|
|
|
705 bool Parser::isTypeConstraintAnnotation() {
|
|
|
706 const Token &T = Tok.is(tok::annot_cxxscope) ? NextToken() : Tok;
|
|
|
707 if (T.isNot(tok::annot_template_id))
|
|
|
708 return false;
|
|
|
709 const auto *ExistingAnnot =
|
|
|
710 static_cast<TemplateIdAnnotation *>(T.getAnnotationValue());
|
|
|
711 return ExistingAnnot->Kind == TNK_Concept_template;
|
|
|
712 }
|
|
|
713
|
|
|
714 /// Try parsing a type-constraint at the current location.
|
|
|
715 ///
|
|
|
716 /// type-constraint:
|
|
|
717 /// nested-name-specifier[opt] concept-name
|
|
|
718 /// nested-name-specifier[opt] concept-name
|
|
|
719 /// '<' template-argument-list[opt] '>'[opt]
|
|
|
720 ///
|
|
|
721 /// \returns true if an error occurred, and false otherwise.
|
|
|
722 bool Parser::TryAnnotateTypeConstraint() {
|
|
173
|
723 if (!getLangOpts().CPlusPlus20)
|
|
150
|
724 return false;
|
|
|
725 CXXScopeSpec SS;
|
|
|
726 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
|
|
173
|
727 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
|
|
236
|
728 /*ObjectHasErrors=*/false,
|
|
173
|
729 /*EnteringContext=*/false,
|
|
|
730 /*MayBePseudoDestructor=*/nullptr,
|
|
|
731 // If this is not a type-constraint, then
|
|
|
732 // this scope-spec is part of the typename
|
|
|
733 // of a non-type template parameter
|
|
|
734 /*IsTypename=*/true, /*LastII=*/nullptr,
|
|
|
735 // We won't find concepts in
|
|
|
736 // non-namespaces anyway, so might as well
|
|
|
737 // parse this correctly for possible type
|
|
|
738 // names.
|
|
|
739 /*OnlyNamespace=*/false))
|
|
150
|
740 return true;
|
|
|
741
|
|
|
742 if (Tok.is(tok::identifier)) {
|
|
|
743 UnqualifiedId PossibleConceptName;
|
|
|
744 PossibleConceptName.setIdentifier(Tok.getIdentifierInfo(),
|
|
|
745 Tok.getLocation());
|
|
|
746
|
|
|
747 TemplateTy PossibleConcept;
|
|
|
748 bool MemberOfUnknownSpecialization = false;
|
|
|
749 auto TNK = Actions.isTemplateName(getCurScope(), SS,
|
|
|
750 /*hasTemplateKeyword=*/false,
|
|
|
751 PossibleConceptName,
|
|
|
752 /*ObjectType=*/ParsedType(),
|
|
|
753 /*EnteringContext=*/false,
|
|
|
754 PossibleConcept,
|
|
173
|
755 MemberOfUnknownSpecialization,
|
|
|
756 /*Disambiguation=*/true);
|
|
150
|
757 if (MemberOfUnknownSpecialization || !PossibleConcept ||
|
|
|
758 TNK != TNK_Concept_template) {
|
|
|
759 if (SS.isNotEmpty())
|
|
|
760 AnnotateScopeToken(SS, !WasScopeAnnotation);
|
|
|
761 return false;
|
|
|
762 }
|
|
|
763
|
|
|
764 // At this point we're sure we're dealing with a constrained parameter. It
|
|
|
765 // may or may not have a template parameter list following the concept
|
|
|
766 // name.
|
|
|
767 if (AnnotateTemplateIdToken(PossibleConcept, TNK, SS,
|
|
|
768 /*TemplateKWLoc=*/SourceLocation(),
|
|
|
769 PossibleConceptName,
|
|
|
770 /*AllowTypeAnnotation=*/false,
|
|
|
771 /*TypeConstraint=*/true))
|
|
|
772 return true;
|
|
|
773 }
|
|
|
774
|
|
|
775 if (SS.isNotEmpty())
|
|
|
776 AnnotateScopeToken(SS, !WasScopeAnnotation);
|
|
|
777 return false;
|
|
|
778 }
|
|
|
779
|
|
|
780 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
|
|
|
781 /// Other kinds of template parameters are parsed in
|
|
|
782 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
|
|
|
783 ///
|
|
|
784 /// type-parameter: [C++ temp.param]
|
|
|
785 /// 'class' ...[opt][C++0x] identifier[opt]
|
|
|
786 /// 'class' identifier[opt] '=' type-id
|
|
|
787 /// 'typename' ...[opt][C++0x] identifier[opt]
|
|
|
788 /// 'typename' identifier[opt] '=' type-id
|
|
|
789 NamedDecl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
|
|
|
790 assert((Tok.isOneOf(tok::kw_class, tok::kw_typename) ||
|
|
|
791 isTypeConstraintAnnotation()) &&
|
|
|
792 "A type-parameter starts with 'class', 'typename' or a "
|
|
|
793 "type-constraint");
|
|
|
794
|
|
|
795 CXXScopeSpec TypeConstraintSS;
|
|
|
796 TemplateIdAnnotation *TypeConstraint = nullptr;
|
|
|
797 bool TypenameKeyword = false;
|
|
|
798 SourceLocation KeyLoc;
|
|
173
|
799 ParseOptionalCXXScopeSpecifier(TypeConstraintSS, /*ObjectType=*/nullptr,
|
|
236
|
800 /*ObjectHasErrors=*/false,
|
|
150
|
801 /*EnteringContext*/ false);
|
|
|
802 if (Tok.is(tok::annot_template_id)) {
|
|
|
803 // Consume the 'type-constraint'.
|
|
|
804 TypeConstraint =
|
|
|
805 static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
|
|
|
806 assert(TypeConstraint->Kind == TNK_Concept_template &&
|
|
|
807 "stray non-concept template-id annotation");
|
|
|
808 KeyLoc = ConsumeAnnotationToken();
|
|
|
809 } else {
|
|
|
810 assert(TypeConstraintSS.isEmpty() &&
|
|
|
811 "expected type constraint after scope specifier");
|
|
|
812
|
|
|
813 // Consume the 'class' or 'typename' keyword.
|
|
|
814 TypenameKeyword = Tok.is(tok::kw_typename);
|
|
|
815 KeyLoc = ConsumeToken();
|
|
|
816 }
|
|
|
817
|
|
|
818 // Grab the ellipsis (if given).
|
|
|
819 SourceLocation EllipsisLoc;
|
|
|
820 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
|
|
|
821 Diag(EllipsisLoc,
|
|
|
822 getLangOpts().CPlusPlus11
|
|
|
823 ? diag::warn_cxx98_compat_variadic_templates
|
|
|
824 : diag::ext_variadic_templates);
|
|
|
825 }
|
|
|
826
|
|
|
827 // Grab the template parameter name (if given)
|
|
|
828 SourceLocation NameLoc = Tok.getLocation();
|
|
|
829 IdentifierInfo *ParamName = nullptr;
|
|
|
830 if (Tok.is(tok::identifier)) {
|
|
|
831 ParamName = Tok.getIdentifierInfo();
|
|
|
832 ConsumeToken();
|
|
|
833 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
|
|
|
834 tok::greatergreater)) {
|
|
|
835 // Unnamed template parameter. Don't have to do anything here, just
|
|
|
836 // don't consume this token.
|
|
|
837 } else {
|
|
|
838 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
|
|
|
839 return nullptr;
|
|
|
840 }
|
|
|
841
|
|
|
842 // Recover from misplaced ellipsis.
|
|
|
843 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
|
|
|
844 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
845 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
|
|
|
846
|
|
|
847 // Grab a default argument (if available).
|
|
|
848 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
|
849 // we introduce the type parameter into the local scope.
|
|
|
850 SourceLocation EqualLoc;
|
|
|
851 ParsedType DefaultArg;
|
|
|
852 if (TryConsumeToken(tok::equal, EqualLoc))
|
|
221
|
853 DefaultArg =
|
|
|
854 ParseTypeName(/*Range=*/nullptr, DeclaratorContext::TemplateTypeArg)
|
|
|
855 .get();
|
|
150
|
856
|
|
|
857 NamedDecl *NewDecl = Actions.ActOnTypeParameter(getCurScope(),
|
|
|
858 TypenameKeyword, EllipsisLoc,
|
|
|
859 KeyLoc, ParamName, NameLoc,
|
|
|
860 Depth, Position, EqualLoc,
|
|
|
861 DefaultArg,
|
|
|
862 TypeConstraint != nullptr);
|
|
|
863
|
|
|
864 if (TypeConstraint) {
|
|
|
865 Actions.ActOnTypeConstraint(TypeConstraintSS, TypeConstraint,
|
|
|
866 cast<TemplateTypeParmDecl>(NewDecl),
|
|
|
867 EllipsisLoc);
|
|
|
868 }
|
|
|
869
|
|
|
870 return NewDecl;
|
|
|
871 }
|
|
|
872
|
|
|
873 /// ParseTemplateTemplateParameter - Handle the parsing of template
|
|
|
874 /// template parameters.
|
|
|
875 ///
|
|
|
876 /// type-parameter: [C++ temp.param]
|
|
236
|
877 /// template-head type-parameter-key ...[opt] identifier[opt]
|
|
|
878 /// template-head type-parameter-key identifier[opt] = id-expression
|
|
150
|
879 /// type-parameter-key:
|
|
|
880 /// 'class'
|
|
|
881 /// 'typename' [C++1z]
|
|
236
|
882 /// template-head: [C++2a]
|
|
|
883 /// 'template' '<' template-parameter-list '>'
|
|
|
884 /// requires-clause[opt]
|
|
|
885 NamedDecl *Parser::ParseTemplateTemplateParameter(unsigned Depth,
|
|
|
886 unsigned Position) {
|
|
150
|
887 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
|
|
|
888
|
|
|
889 // Handle the template <...> part.
|
|
|
890 SourceLocation TemplateLoc = ConsumeToken();
|
|
|
891 SmallVector<NamedDecl*,8> TemplateParams;
|
|
|
892 SourceLocation LAngleLoc, RAngleLoc;
|
|
236
|
893 ExprResult OptionalRequiresClauseConstraintER;
|
|
150
|
894 {
|
|
221
|
895 MultiParseScope TemplateParmScope(*this);
|
|
|
896 if (ParseTemplateParameters(TemplateParmScope, Depth + 1, TemplateParams,
|
|
|
897 LAngleLoc, RAngleLoc)) {
|
|
150
|
898 return nullptr;
|
|
|
899 }
|
|
236
|
900 if (TryConsumeToken(tok::kw_requires)) {
|
|
|
901 OptionalRequiresClauseConstraintER =
|
|
|
902 Actions.ActOnRequiresClause(ParseConstraintLogicalOrExpression(
|
|
|
903 /*IsTrailingRequiresClause=*/false));
|
|
|
904 if (!OptionalRequiresClauseConstraintER.isUsable()) {
|
|
|
905 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
906 StopAtSemi | StopBeforeMatch);
|
|
|
907 return nullptr;
|
|
|
908 }
|
|
|
909 }
|
|
150
|
910 }
|
|
|
911
|
|
|
912 // Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
|
|
|
913 // Generate a meaningful error if the user forgot to put class before the
|
|
|
914 // identifier, comma, or greater. Provide a fixit if the identifier, comma,
|
|
|
915 // or greater appear immediately or after 'struct'. In the latter case,
|
|
|
916 // replace the keyword with 'class'.
|
|
|
917 if (!TryConsumeToken(tok::kw_class)) {
|
|
|
918 bool Replace = Tok.isOneOf(tok::kw_typename, tok::kw_struct);
|
|
|
919 const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
|
|
|
920 if (Tok.is(tok::kw_typename)) {
|
|
|
921 Diag(Tok.getLocation(),
|
|
|
922 getLangOpts().CPlusPlus17
|
|
|
923 ? diag::warn_cxx14_compat_template_template_param_typename
|
|
|
924 : diag::ext_template_template_param_typename)
|
|
|
925 << (!getLangOpts().CPlusPlus17
|
|
|
926 ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
|
|
|
927 : FixItHint());
|
|
|
928 } else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
|
|
|
929 tok::greatergreater, tok::ellipsis)) {
|
|
|
930 Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
|
|
236
|
931 << getLangOpts().CPlusPlus17
|
|
|
932 << (Replace
|
|
|
933 ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
|
|
|
934 : FixItHint::CreateInsertion(Tok.getLocation(), "class "));
|
|
150
|
935 } else
|
|
236
|
936 Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
|
|
|
937 << getLangOpts().CPlusPlus17;
|
|
150
|
938
|
|
|
939 if (Replace)
|
|
|
940 ConsumeToken();
|
|
|
941 }
|
|
|
942
|
|
|
943 // Parse the ellipsis, if given.
|
|
|
944 SourceLocation EllipsisLoc;
|
|
|
945 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
946 Diag(EllipsisLoc,
|
|
|
947 getLangOpts().CPlusPlus11
|
|
|
948 ? diag::warn_cxx98_compat_variadic_templates
|
|
|
949 : diag::ext_variadic_templates);
|
|
|
950
|
|
|
951 // Get the identifier, if given.
|
|
|
952 SourceLocation NameLoc = Tok.getLocation();
|
|
|
953 IdentifierInfo *ParamName = nullptr;
|
|
|
954 if (Tok.is(tok::identifier)) {
|
|
|
955 ParamName = Tok.getIdentifierInfo();
|
|
|
956 ConsumeToken();
|
|
|
957 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
|
|
|
958 tok::greatergreater)) {
|
|
|
959 // Unnamed template parameter. Don't have to do anything here, just
|
|
|
960 // don't consume this token.
|
|
|
961 } else {
|
|
|
962 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
|
|
|
963 return nullptr;
|
|
|
964 }
|
|
|
965
|
|
|
966 // Recover from misplaced ellipsis.
|
|
|
967 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
|
|
|
968 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
969 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
|
|
|
970
|
|
236
|
971 TemplateParameterList *ParamList = Actions.ActOnTemplateParameterList(
|
|
|
972 Depth, SourceLocation(), TemplateLoc, LAngleLoc, TemplateParams,
|
|
|
973 RAngleLoc, OptionalRequiresClauseConstraintER.get());
|
|
150
|
974
|
|
|
975 // Grab a default argument (if available).
|
|
|
976 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
|
977 // we introduce the template parameter into the local scope.
|
|
|
978 SourceLocation EqualLoc;
|
|
|
979 ParsedTemplateArgument DefaultArg;
|
|
|
980 if (TryConsumeToken(tok::equal, EqualLoc)) {
|
|
|
981 DefaultArg = ParseTemplateTemplateArgument();
|
|
|
982 if (DefaultArg.isInvalid()) {
|
|
|
983 Diag(Tok.getLocation(),
|
|
|
984 diag::err_default_template_template_parameter_not_template);
|
|
|
985 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
986 StopAtSemi | StopBeforeMatch);
|
|
|
987 }
|
|
|
988 }
|
|
|
989
|
|
|
990 return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
|
|
|
991 ParamList, EllipsisLoc,
|
|
|
992 ParamName, NameLoc, Depth,
|
|
|
993 Position, EqualLoc, DefaultArg);
|
|
|
994 }
|
|
|
995
|
|
|
996 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type
|
|
|
997 /// template parameters (e.g., in "template<int Size> class array;").
|
|
|
998 ///
|
|
|
999 /// template-parameter:
|
|
|
1000 /// ...
|
|
|
1001 /// parameter-declaration
|
|
|
1002 NamedDecl *
|
|
|
1003 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
|
|
|
1004 // Parse the declaration-specifiers (i.e., the type).
|
|
|
1005 // FIXME: The type should probably be restricted in some way... Not all
|
|
|
1006 // declarators (parts of declarators?) are accepted for parameters.
|
|
|
1007 DeclSpec DS(AttrFactory);
|
|
|
1008 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none,
|
|
|
1009 DeclSpecContext::DSC_template_param);
|
|
|
1010
|
|
|
1011 // Parse this as a typename.
|
|
236
|
1012 Declarator ParamDecl(DS, ParsedAttributesView::none(),
|
|
|
1013 DeclaratorContext::TemplateParam);
|
|
150
|
1014 ParseDeclarator(ParamDecl);
|
|
|
1015 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
|
|
|
1016 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
|
|
|
1017 return nullptr;
|
|
|
1018 }
|
|
|
1019
|
|
|
1020 // Recover from misplaced ellipsis.
|
|
|
1021 SourceLocation EllipsisLoc;
|
|
|
1022 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
1023 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
|
|
|
1024
|
|
|
1025 // If there is a default value, parse it.
|
|
|
1026 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
|
1027 // we introduce the template parameter into the local scope.
|
|
|
1028 SourceLocation EqualLoc;
|
|
|
1029 ExprResult DefaultArg;
|
|
|
1030 if (TryConsumeToken(tok::equal, EqualLoc)) {
|
|
236
|
1031 if (Tok.is(tok::l_paren) && NextToken().is(tok::l_brace)) {
|
|
|
1032 Diag(Tok.getLocation(), diag::err_stmt_expr_in_default_arg) << 1;
|
|
150
|
1033 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
|
|
236
|
1034 } else {
|
|
|
1035 // C++ [temp.param]p15:
|
|
|
1036 // When parsing a default template-argument for a non-type
|
|
|
1037 // template-parameter, the first non-nested > is taken as the
|
|
|
1038 // end of the template-parameter-list rather than a greater-than
|
|
|
1039 // operator.
|
|
|
1040 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
|
|
|
1041 EnterExpressionEvaluationContext ConstantEvaluated(
|
|
|
1042 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
|
|
|
1043 DefaultArg =
|
|
|
1044 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
|
|
|
1045 if (DefaultArg.isInvalid())
|
|
|
1046 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
|
|
|
1047 }
|
|
150
|
1048 }
|
|
|
1049
|
|
|
1050 // Create the parameter.
|
|
|
1051 return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
|
|
173
|
1052 Depth, Position, EqualLoc,
|
|
150
|
1053 DefaultArg.get());
|
|
|
1054 }
|
|
|
1055
|
|
|
1056 void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
|
|
|
1057 SourceLocation CorrectLoc,
|
|
|
1058 bool AlreadyHasEllipsis,
|
|
|
1059 bool IdentifierHasName) {
|
|
|
1060 FixItHint Insertion;
|
|
|
1061 if (!AlreadyHasEllipsis)
|
|
|
1062 Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
|
|
|
1063 Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
|
|
|
1064 << FixItHint::CreateRemoval(EllipsisLoc) << Insertion
|
|
|
1065 << !IdentifierHasName;
|
|
|
1066 }
|
|
|
1067
|
|
|
1068 void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
|
|
|
1069 Declarator &D) {
|
|
|
1070 assert(EllipsisLoc.isValid());
|
|
|
1071 bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
|
|
|
1072 if (!AlreadyHasEllipsis)
|
|
|
1073 D.setEllipsisLoc(EllipsisLoc);
|
|
|
1074 DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
|
|
|
1075 AlreadyHasEllipsis, D.hasName());
|
|
|
1076 }
|
|
|
1077
|
|
|
1078 /// Parses a '>' at the end of a template list.
|
|
|
1079 ///
|
|
|
1080 /// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
|
|
|
1081 /// to determine if these tokens were supposed to be a '>' followed by
|
|
|
1082 /// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
|
|
|
1083 ///
|
|
|
1084 /// \param RAngleLoc the location of the consumed '>'.
|
|
|
1085 ///
|
|
|
1086 /// \param ConsumeLastToken if true, the '>' is consumed.
|
|
|
1087 ///
|
|
|
1088 /// \param ObjCGenericList if true, this is the '>' closing an Objective-C
|
|
|
1089 /// type parameter or type argument list, rather than a C++ template parameter
|
|
|
1090 /// or argument list.
|
|
|
1091 ///
|
|
|
1092 /// \returns true, if current token does not start with '>', false otherwise.
|
|
173
|
1093 bool Parser::ParseGreaterThanInTemplateList(SourceLocation LAngleLoc,
|
|
|
1094 SourceLocation &RAngleLoc,
|
|
150
|
1095 bool ConsumeLastToken,
|
|
|
1096 bool ObjCGenericList) {
|
|
|
1097 // What will be left once we've consumed the '>'.
|
|
|
1098 tok::TokenKind RemainingToken;
|
|
|
1099 const char *ReplacementStr = "> >";
|
|
|
1100 bool MergeWithNextToken = false;
|
|
|
1101
|
|
|
1102 switch (Tok.getKind()) {
|
|
|
1103 default:
|
|
173
|
1104 Diag(getEndOfPreviousToken(), diag::err_expected) << tok::greater;
|
|
|
1105 Diag(LAngleLoc, diag::note_matching) << tok::less;
|
|
150
|
1106 return true;
|
|
|
1107
|
|
|
1108 case tok::greater:
|
|
|
1109 // Determine the location of the '>' token. Only consume this token
|
|
|
1110 // if the caller asked us to.
|
|
|
1111 RAngleLoc = Tok.getLocation();
|
|
|
1112 if (ConsumeLastToken)
|
|
|
1113 ConsumeToken();
|
|
|
1114 return false;
|
|
|
1115
|
|
|
1116 case tok::greatergreater:
|
|
|
1117 RemainingToken = tok::greater;
|
|
|
1118 break;
|
|
|
1119
|
|
|
1120 case tok::greatergreatergreater:
|
|
|
1121 RemainingToken = tok::greatergreater;
|
|
|
1122 break;
|
|
|
1123
|
|
|
1124 case tok::greaterequal:
|
|
|
1125 RemainingToken = tok::equal;
|
|
|
1126 ReplacementStr = "> =";
|
|
|
1127
|
|
|
1128 // Join two adjacent '=' tokens into one, for cases like:
|
|
|
1129 // void (*p)() = f<int>;
|
|
|
1130 // return f<int>==p;
|
|
|
1131 if (NextToken().is(tok::equal) &&
|
|
|
1132 areTokensAdjacent(Tok, NextToken())) {
|
|
|
1133 RemainingToken = tok::equalequal;
|
|
|
1134 MergeWithNextToken = true;
|
|
|
1135 }
|
|
|
1136 break;
|
|
|
1137
|
|
|
1138 case tok::greatergreaterequal:
|
|
|
1139 RemainingToken = tok::greaterequal;
|
|
|
1140 break;
|
|
|
1141 }
|
|
|
1142
|
|
|
1143 // This template-id is terminated by a token that starts with a '>'.
|
|
|
1144 // Outside C++11 and Objective-C, this is now error recovery.
|
|
|
1145 //
|
|
|
1146 // C++11 allows this when the token is '>>', and in CUDA + C++11 mode, we
|
|
|
1147 // extend that treatment to also apply to the '>>>' token.
|
|
|
1148 //
|
|
|
1149 // Objective-C allows this in its type parameter / argument lists.
|
|
|
1150
|
|
|
1151 SourceLocation TokBeforeGreaterLoc = PrevTokLocation;
|
|
|
1152 SourceLocation TokLoc = Tok.getLocation();
|
|
|
1153 Token Next = NextToken();
|
|
|
1154
|
|
|
1155 // Whether splitting the current token after the '>' would undesirably result
|
|
|
1156 // in the remaining token pasting with the token after it. This excludes the
|
|
|
1157 // MergeWithNextToken cases, which we've already handled.
|
|
|
1158 bool PreventMergeWithNextToken =
|
|
|
1159 (RemainingToken == tok::greater ||
|
|
|
1160 RemainingToken == tok::greatergreater) &&
|
|
|
1161 (Next.isOneOf(tok::greater, tok::greatergreater,
|
|
|
1162 tok::greatergreatergreater, tok::equal, tok::greaterequal,
|
|
|
1163 tok::greatergreaterequal, tok::equalequal)) &&
|
|
|
1164 areTokensAdjacent(Tok, Next);
|
|
|
1165
|
|
|
1166 // Diagnose this situation as appropriate.
|
|
|
1167 if (!ObjCGenericList) {
|
|
|
1168 // The source range of the replaced token(s).
|
|
|
1169 CharSourceRange ReplacementRange = CharSourceRange::getCharRange(
|
|
|
1170 TokLoc, Lexer::AdvanceToTokenCharacter(TokLoc, 2, PP.getSourceManager(),
|
|
|
1171 getLangOpts()));
|
|
|
1172
|
|
|
1173 // A hint to put a space between the '>>'s. In order to make the hint as
|
|
|
1174 // clear as possible, we include the characters either side of the space in
|
|
|
1175 // the replacement, rather than just inserting a space at SecondCharLoc.
|
|
|
1176 FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
|
|
|
1177 ReplacementStr);
|
|
|
1178
|
|
|
1179 // A hint to put another space after the token, if it would otherwise be
|
|
|
1180 // lexed differently.
|
|
|
1181 FixItHint Hint2;
|
|
|
1182 if (PreventMergeWithNextToken)
|
|
|
1183 Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
|
|
|
1184
|
|
|
1185 unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
|
|
|
1186 if (getLangOpts().CPlusPlus11 &&
|
|
|
1187 (Tok.is(tok::greatergreater) || Tok.is(tok::greatergreatergreater)))
|
|
|
1188 DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
|
|
|
1189 else if (Tok.is(tok::greaterequal))
|
|
|
1190 DiagId = diag::err_right_angle_bracket_equal_needs_space;
|
|
|
1191 Diag(TokLoc, DiagId) << Hint1 << Hint2;
|
|
|
1192 }
|
|
|
1193
|
|
|
1194 // Find the "length" of the resulting '>' token. This is not always 1, as it
|
|
|
1195 // can contain escaped newlines.
|
|
|
1196 unsigned GreaterLength = Lexer::getTokenPrefixLength(
|
|
|
1197 TokLoc, 1, PP.getSourceManager(), getLangOpts());
|
|
|
1198
|
|
|
1199 // Annotate the source buffer to indicate that we split the token after the
|
|
|
1200 // '>'. This allows us to properly find the end of, and extract the spelling
|
|
|
1201 // of, the '>' token later.
|
|
|
1202 RAngleLoc = PP.SplitToken(TokLoc, GreaterLength);
|
|
|
1203
|
|
|
1204 // Strip the initial '>' from the token.
|
|
|
1205 bool CachingTokens = PP.IsPreviousCachedToken(Tok);
|
|
|
1206
|
|
|
1207 Token Greater = Tok;
|
|
|
1208 Greater.setLocation(RAngleLoc);
|
|
|
1209 Greater.setKind(tok::greater);
|
|
|
1210 Greater.setLength(GreaterLength);
|
|
|
1211
|
|
|
1212 unsigned OldLength = Tok.getLength();
|
|
|
1213 if (MergeWithNextToken) {
|
|
|
1214 ConsumeToken();
|
|
|
1215 OldLength += Tok.getLength();
|
|
|
1216 }
|
|
|
1217
|
|
|
1218 Tok.setKind(RemainingToken);
|
|
|
1219 Tok.setLength(OldLength - GreaterLength);
|
|
|
1220
|
|
|
1221 // Split the second token if lexing it normally would lex a different token
|
|
|
1222 // (eg, the fifth token in 'A<B>>>' should re-lex as '>', not '>>').
|
|
|
1223 SourceLocation AfterGreaterLoc = TokLoc.getLocWithOffset(GreaterLength);
|
|
|
1224 if (PreventMergeWithNextToken)
|
|
|
1225 AfterGreaterLoc = PP.SplitToken(AfterGreaterLoc, Tok.getLength());
|
|
|
1226 Tok.setLocation(AfterGreaterLoc);
|
|
|
1227
|
|
|
1228 // Update the token cache to match what we just did if necessary.
|
|
|
1229 if (CachingTokens) {
|
|
|
1230 // If the previous cached token is being merged, delete it.
|
|
|
1231 if (MergeWithNextToken)
|
|
|
1232 PP.ReplacePreviousCachedToken({});
|
|
|
1233
|
|
|
1234 if (ConsumeLastToken)
|
|
|
1235 PP.ReplacePreviousCachedToken({Greater, Tok});
|
|
|
1236 else
|
|
|
1237 PP.ReplacePreviousCachedToken({Greater});
|
|
|
1238 }
|
|
|
1239
|
|
|
1240 if (ConsumeLastToken) {
|
|
|
1241 PrevTokLocation = RAngleLoc;
|
|
|
1242 } else {
|
|
|
1243 PrevTokLocation = TokBeforeGreaterLoc;
|
|
|
1244 PP.EnterToken(Tok, /*IsReinject=*/true);
|
|
|
1245 Tok = Greater;
|
|
|
1246 }
|
|
|
1247
|
|
|
1248 return false;
|
|
|
1249 }
|
|
|
1250
|
|
|
1251 /// Parses a template-id that after the template name has
|
|
|
1252 /// already been parsed.
|
|
|
1253 ///
|
|
|
1254 /// This routine takes care of parsing the enclosed template argument
|
|
|
1255 /// list ('<' template-parameter-list [opt] '>') and placing the
|
|
|
1256 /// results into a form that can be transferred to semantic analysis.
|
|
|
1257 ///
|
|
|
1258 /// \param ConsumeLastToken if true, then we will consume the last
|
|
|
1259 /// token that forms the template-id. Otherwise, we will leave the
|
|
|
1260 /// last token in the stream (e.g., so that it can be replaced with an
|
|
|
1261 /// annotation token).
|
|
236
|
1262 bool Parser::ParseTemplateIdAfterTemplateName(bool ConsumeLastToken,
|
|
|
1263 SourceLocation &LAngleLoc,
|
|
|
1264 TemplateArgList &TemplateArgs,
|
|
|
1265 SourceLocation &RAngleLoc,
|
|
|
1266 TemplateTy Template) {
|
|
150
|
1267 assert(Tok.is(tok::less) && "Must have already parsed the template-name");
|
|
|
1268
|
|
|
1269 // Consume the '<'.
|
|
|
1270 LAngleLoc = ConsumeToken();
|
|
|
1271
|
|
|
1272 // Parse the optional template-argument-list.
|
|
|
1273 bool Invalid = false;
|
|
|
1274 {
|
|
|
1275 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
|
|
|
1276 if (!Tok.isOneOf(tok::greater, tok::greatergreater,
|
|
|
1277 tok::greatergreatergreater, tok::greaterequal,
|
|
|
1278 tok::greatergreaterequal))
|
|
236
|
1279 Invalid = ParseTemplateArgumentList(TemplateArgs, Template, LAngleLoc);
|
|
150
|
1280
|
|
|
1281 if (Invalid) {
|
|
|
1282 // Try to find the closing '>'.
|
|
173
|
1283 if (getLangOpts().CPlusPlus11)
|
|
|
1284 SkipUntil(tok::greater, tok::greatergreater,
|
|
|
1285 tok::greatergreatergreater, StopAtSemi | StopBeforeMatch);
|
|
150
|
1286 else
|
|
|
1287 SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
|
|
|
1288 }
|
|
|
1289 }
|
|
|
1290
|
|
173
|
1291 return ParseGreaterThanInTemplateList(LAngleLoc, RAngleLoc, ConsumeLastToken,
|
|
|
1292 /*ObjCGenericList=*/false) ||
|
|
|
1293 Invalid;
|
|
150
|
1294 }
|
|
|
1295
|
|
|
1296 /// Replace the tokens that form a simple-template-id with an
|
|
|
1297 /// annotation token containing the complete template-id.
|
|
|
1298 ///
|
|
|
1299 /// The first token in the stream must be the name of a template that
|
|
|
1300 /// is followed by a '<'. This routine will parse the complete
|
|
|
1301 /// simple-template-id and replace the tokens with a single annotation
|
|
|
1302 /// token with one of two different kinds: if the template-id names a
|
|
|
1303 /// type (and \p AllowTypeAnnotation is true), the annotation token is
|
|
|
1304 /// a type annotation that includes the optional nested-name-specifier
|
|
|
1305 /// (\p SS). Otherwise, the annotation token is a template-id
|
|
|
1306 /// annotation that does not include the optional
|
|
|
1307 /// nested-name-specifier.
|
|
|
1308 ///
|
|
|
1309 /// \param Template the declaration of the template named by the first
|
|
|
1310 /// token (an identifier), as returned from \c Action::isTemplateName().
|
|
|
1311 ///
|
|
|
1312 /// \param TNK the kind of template that \p Template
|
|
|
1313 /// refers to, as returned from \c Action::isTemplateName().
|
|
|
1314 ///
|
|
|
1315 /// \param SS if non-NULL, the nested-name-specifier that precedes
|
|
|
1316 /// this template name.
|
|
|
1317 ///
|
|
|
1318 /// \param TemplateKWLoc if valid, specifies that this template-id
|
|
|
1319 /// annotation was preceded by the 'template' keyword and gives the
|
|
|
1320 /// location of that keyword. If invalid (the default), then this
|
|
|
1321 /// template-id was not preceded by a 'template' keyword.
|
|
|
1322 ///
|
|
|
1323 /// \param AllowTypeAnnotation if true (the default), then a
|
|
|
1324 /// simple-template-id that refers to a class template, template
|
|
|
1325 /// template parameter, or other template that produces a type will be
|
|
|
1326 /// replaced with a type annotation token. Otherwise, the
|
|
|
1327 /// simple-template-id is always replaced with a template-id
|
|
|
1328 /// annotation token.
|
|
|
1329 ///
|
|
|
1330 /// \param TypeConstraint if true, then this is actually a type-constraint,
|
|
|
1331 /// meaning that the template argument list can be omitted (and the template in
|
|
|
1332 /// question must be a concept).
|
|
|
1333 ///
|
|
|
1334 /// If an unrecoverable parse error occurs and no annotation token can be
|
|
|
1335 /// formed, this function returns true.
|
|
|
1336 ///
|
|
|
1337 bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
|
|
|
1338 CXXScopeSpec &SS,
|
|
|
1339 SourceLocation TemplateKWLoc,
|
|
|
1340 UnqualifiedId &TemplateName,
|
|
|
1341 bool AllowTypeAnnotation,
|
|
|
1342 bool TypeConstraint) {
|
|
|
1343 assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++");
|
|
173
|
1344 assert((Tok.is(tok::less) || TypeConstraint) &&
|
|
150
|
1345 "Parser isn't at the beginning of a template-id");
|
|
|
1346 assert(!(TypeConstraint && AllowTypeAnnotation) && "type-constraint can't be "
|
|
|
1347 "a type annotation");
|
|
|
1348 assert((!TypeConstraint || TNK == TNK_Concept_template) && "type-constraint "
|
|
|
1349 "must accompany a concept name");
|
|
173
|
1350 assert((Template || TNK == TNK_Non_template) && "missing template name");
|
|
150
|
1351
|
|
|
1352 // Consume the template-name.
|
|
|
1353 SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
|
|
|
1354
|
|
|
1355 // Parse the enclosed template argument list.
|
|
|
1356 SourceLocation LAngleLoc, RAngleLoc;
|
|
|
1357 TemplateArgList TemplateArgs;
|
|
173
|
1358 bool ArgsInvalid = false;
|
|
150
|
1359 if (!TypeConstraint || Tok.is(tok::less)) {
|
|
236
|
1360 ArgsInvalid = ParseTemplateIdAfterTemplateName(
|
|
|
1361 false, LAngleLoc, TemplateArgs, RAngleLoc, Template);
|
|
173
|
1362 // If we couldn't recover from invalid arguments, don't form an annotation
|
|
|
1363 // token -- we don't know how much to annotate.
|
|
|
1364 // FIXME: This can lead to duplicate diagnostics if we retry parsing this
|
|
|
1365 // template-id in another context. Try to annotate anyway?
|
|
|
1366 if (RAngleLoc.isInvalid())
|
|
150
|
1367 return true;
|
|
|
1368 }
|
|
|
1369
|
|
|
1370 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
|
|
|
1371
|
|
|
1372 // Build the annotation token.
|
|
|
1373 if (TNK == TNK_Type_template && AllowTypeAnnotation) {
|
|
173
|
1374 TypeResult Type = ArgsInvalid
|
|
|
1375 ? TypeError()
|
|
|
1376 : Actions.ActOnTemplateIdType(
|
|
|
1377 getCurScope(), SS, TemplateKWLoc, Template,
|
|
|
1378 TemplateName.Identifier, TemplateNameLoc,
|
|
|
1379 LAngleLoc, TemplateArgsPtr, RAngleLoc);
|
|
150
|
1380
|
|
|
1381 Tok.setKind(tok::annot_typename);
|
|
173
|
1382 setTypeAnnotation(Tok, Type);
|
|
150
|
1383 if (SS.isNotEmpty())
|
|
|
1384 Tok.setLocation(SS.getBeginLoc());
|
|
|
1385 else if (TemplateKWLoc.isValid())
|
|
|
1386 Tok.setLocation(TemplateKWLoc);
|
|
|
1387 else
|
|
|
1388 Tok.setLocation(TemplateNameLoc);
|
|
|
1389 } else {
|
|
|
1390 // Build a template-id annotation token that can be processed
|
|
|
1391 // later.
|
|
|
1392 Tok.setKind(tok::annot_template_id);
|
|
|
1393
|
|
|
1394 IdentifierInfo *TemplateII =
|
|
|
1395 TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
|
|
|
1396 ? TemplateName.Identifier
|
|
|
1397 : nullptr;
|
|
|
1398
|
|
|
1399 OverloadedOperatorKind OpKind =
|
|
|
1400 TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
|
|
|
1401 ? OO_None
|
|
|
1402 : TemplateName.OperatorFunctionId.Operator;
|
|
|
1403
|
|
|
1404 TemplateIdAnnotation *TemplateId = TemplateIdAnnotation::Create(
|
|
|
1405 TemplateKWLoc, TemplateNameLoc, TemplateII, OpKind, Template, TNK,
|
|
173
|
1406 LAngleLoc, RAngleLoc, TemplateArgs, ArgsInvalid, TemplateIds);
|
|
150
|
1407
|
|
|
1408 Tok.setAnnotationValue(TemplateId);
|
|
|
1409 if (TemplateKWLoc.isValid())
|
|
|
1410 Tok.setLocation(TemplateKWLoc);
|
|
|
1411 else
|
|
|
1412 Tok.setLocation(TemplateNameLoc);
|
|
|
1413 }
|
|
|
1414
|
|
|
1415 // Common fields for the annotation token
|
|
|
1416 Tok.setAnnotationEndLoc(RAngleLoc);
|
|
|
1417
|
|
|
1418 // In case the tokens were cached, have Preprocessor replace them with the
|
|
|
1419 // annotation token.
|
|
|
1420 PP.AnnotateCachedTokens(Tok);
|
|
|
1421 return false;
|
|
|
1422 }
|
|
|
1423
|
|
|
1424 /// Replaces a template-id annotation token with a type
|
|
|
1425 /// annotation token.
|
|
|
1426 ///
|
|
|
1427 /// If there was a failure when forming the type from the template-id,
|
|
|
1428 /// a type annotation token will still be created, but will have a
|
|
|
1429 /// NULL type pointer to signify an error.
|
|
|
1430 ///
|
|
|
1431 /// \param SS The scope specifier appearing before the template-id, if any.
|
|
|
1432 ///
|
|
236
|
1433 /// \param AllowImplicitTypename whether this is a context where T::type
|
|
|
1434 /// denotes a dependent type.
|
|
150
|
1435 /// \param IsClassName Is this template-id appearing in a context where we
|
|
|
1436 /// know it names a class, such as in an elaborated-type-specifier or
|
|
|
1437 /// base-specifier? ('typename' and 'template' are unneeded and disallowed
|
|
|
1438 /// in those contexts.)
|
|
236
|
1439 void Parser::AnnotateTemplateIdTokenAsType(
|
|
|
1440 CXXScopeSpec &SS, ImplicitTypenameContext AllowImplicitTypename,
|
|
|
1441 bool IsClassName) {
|
|
150
|
1442 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
|
|
|
1443
|
|
|
1444 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
|
|
173
|
1445 assert(TemplateId->mightBeType() &&
|
|
150
|
1446 "Only works for type and dependent templates");
|
|
|
1447
|
|
|
1448 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
|
|
|
1449 TemplateId->NumArgs);
|
|
|
1450
|
|
173
|
1451 TypeResult Type =
|
|
|
1452 TemplateId->isInvalid()
|
|
|
1453 ? TypeError()
|
|
|
1454 : Actions.ActOnTemplateIdType(
|
|
|
1455 getCurScope(), SS, TemplateId->TemplateKWLoc,
|
|
|
1456 TemplateId->Template, TemplateId->Name,
|
|
|
1457 TemplateId->TemplateNameLoc, TemplateId->LAngleLoc,
|
|
|
1458 TemplateArgsPtr, TemplateId->RAngleLoc,
|
|
236
|
1459 /*IsCtorOrDtorName=*/false, IsClassName, AllowImplicitTypename);
|
|
150
|
1460 // Create the new "type" annotation token.
|
|
|
1461 Tok.setKind(tok::annot_typename);
|
|
173
|
1462 setTypeAnnotation(Tok, Type);
|
|
150
|
1463 if (SS.isNotEmpty()) // it was a C++ qualified type name.
|
|
|
1464 Tok.setLocation(SS.getBeginLoc());
|
|
|
1465 // End location stays the same
|
|
|
1466
|
|
|
1467 // Replace the template-id annotation token, and possible the scope-specifier
|
|
|
1468 // that precedes it, with the typename annotation token.
|
|
|
1469 PP.AnnotateCachedTokens(Tok);
|
|
|
1470 }
|
|
|
1471
|
|
|
1472 /// Determine whether the given token can end a template argument.
|
|
|
1473 static bool isEndOfTemplateArgument(Token Tok) {
|
|
173
|
1474 // FIXME: Handle '>>>'.
|
|
|
1475 return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater,
|
|
|
1476 tok::greatergreatergreater);
|
|
150
|
1477 }
|
|
|
1478
|
|
|
1479 /// Parse a C++ template template argument.
|
|
|
1480 ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
|
|
|
1481 if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
|
|
|
1482 !Tok.is(tok::annot_cxxscope))
|
|
|
1483 return ParsedTemplateArgument();
|
|
|
1484
|
|
|
1485 // C++0x [temp.arg.template]p1:
|
|
|
1486 // A template-argument for a template template-parameter shall be the name
|
|
|
1487 // of a class template or an alias template, expressed as id-expression.
|
|
|
1488 //
|
|
|
1489 // We parse an id-expression that refers to a class template or alias
|
|
|
1490 // template. The grammar we parse is:
|
|
|
1491 //
|
|
|
1492 // nested-name-specifier[opt] template[opt] identifier ...[opt]
|
|
|
1493 //
|
|
|
1494 // followed by a token that terminates a template argument, such as ',',
|
|
|
1495 // '>', or (in some cases) '>>'.
|
|
|
1496 CXXScopeSpec SS; // nested-name-specifier, if present
|
|
173
|
1497 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
|
|
236
|
1498 /*ObjectHasErrors=*/false,
|
|
150
|
1499 /*EnteringContext=*/false);
|
|
|
1500
|
|
|
1501 ParsedTemplateArgument Result;
|
|
|
1502 SourceLocation EllipsisLoc;
|
|
|
1503 if (SS.isSet() && Tok.is(tok::kw_template)) {
|
|
|
1504 // Parse the optional 'template' keyword following the
|
|
|
1505 // nested-name-specifier.
|
|
|
1506 SourceLocation TemplateKWLoc = ConsumeToken();
|
|
|
1507
|
|
|
1508 if (Tok.is(tok::identifier)) {
|
|
|
1509 // We appear to have a dependent template name.
|
|
|
1510 UnqualifiedId Name;
|
|
|
1511 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
|
|
|
1512 ConsumeToken(); // the identifier
|
|
|
1513
|
|
|
1514 TryConsumeToken(tok::ellipsis, EllipsisLoc);
|
|
|
1515
|
|
173
|
1516 // If the next token signals the end of a template argument, then we have
|
|
|
1517 // a (possibly-dependent) template name that could be a template template
|
|
|
1518 // argument.
|
|
150
|
1519 TemplateTy Template;
|
|
|
1520 if (isEndOfTemplateArgument(Tok) &&
|
|
173
|
1521 Actions.ActOnTemplateName(getCurScope(), SS, TemplateKWLoc, Name,
|
|
|
1522 /*ObjectType=*/nullptr,
|
|
|
1523 /*EnteringContext=*/false, Template))
|
|
150
|
1524 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
|
|
|
1525 }
|
|
|
1526 } else if (Tok.is(tok::identifier)) {
|
|
|
1527 // We may have a (non-dependent) template name.
|
|
|
1528 TemplateTy Template;
|
|
|
1529 UnqualifiedId Name;
|
|
|
1530 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
|
|
|
1531 ConsumeToken(); // the identifier
|
|
|
1532
|
|
|
1533 TryConsumeToken(tok::ellipsis, EllipsisLoc);
|
|
|
1534
|
|
|
1535 if (isEndOfTemplateArgument(Tok)) {
|
|
|
1536 bool MemberOfUnknownSpecialization;
|
|
|
1537 TemplateNameKind TNK = Actions.isTemplateName(
|
|
|
1538 getCurScope(), SS,
|
|
|
1539 /*hasTemplateKeyword=*/false, Name,
|
|
|
1540 /*ObjectType=*/nullptr,
|
|
|
1541 /*EnteringContext=*/false, Template, MemberOfUnknownSpecialization);
|
|
|
1542 if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
|
|
|
1543 // We have an id-expression that refers to a class template or
|
|
|
1544 // (C++0x) alias template.
|
|
|
1545 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
|
|
|
1546 }
|
|
|
1547 }
|
|
|
1548 }
|
|
|
1549
|
|
|
1550 // If this is a pack expansion, build it as such.
|
|
|
1551 if (EllipsisLoc.isValid() && !Result.isInvalid())
|
|
|
1552 Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
|
|
|
1553
|
|
|
1554 return Result;
|
|
|
1555 }
|
|
|
1556
|
|
|
1557 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
|
|
|
1558 ///
|
|
|
1559 /// template-argument: [C++ 14.2]
|
|
|
1560 /// constant-expression
|
|
|
1561 /// type-id
|
|
|
1562 /// id-expression
|
|
|
1563 ParsedTemplateArgument Parser::ParseTemplateArgument() {
|
|
|
1564 // C++ [temp.arg]p2:
|
|
|
1565 // In a template-argument, an ambiguity between a type-id and an
|
|
|
1566 // expression is resolved to a type-id, regardless of the form of
|
|
|
1567 // the corresponding template-parameter.
|
|
|
1568 //
|
|
|
1569 // Therefore, we initially try to parse a type-id - and isCXXTypeId might look
|
|
|
1570 // up and annotate an identifier as an id-expression during disambiguation,
|
|
|
1571 // so enter the appropriate context for a constant expression template
|
|
|
1572 // argument before trying to disambiguate.
|
|
|
1573
|
|
|
1574 EnterExpressionEvaluationContext EnterConstantEvaluated(
|
|
|
1575 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated,
|
|
|
1576 /*LambdaContextDecl=*/nullptr,
|
|
|
1577 /*ExprContext=*/Sema::ExpressionEvaluationContextRecord::EK_TemplateArgument);
|
|
|
1578 if (isCXXTypeId(TypeIdAsTemplateArgument)) {
|
|
|
1579 TypeResult TypeArg = ParseTypeName(
|
|
221
|
1580 /*Range=*/nullptr, DeclaratorContext::TemplateArg);
|
|
150
|
1581 return Actions.ActOnTemplateTypeArgument(TypeArg);
|
|
|
1582 }
|
|
|
1583
|
|
|
1584 // Try to parse a template template argument.
|
|
|
1585 {
|
|
|
1586 TentativeParsingAction TPA(*this);
|
|
|
1587
|
|
|
1588 ParsedTemplateArgument TemplateTemplateArgument
|
|
|
1589 = ParseTemplateTemplateArgument();
|
|
|
1590 if (!TemplateTemplateArgument.isInvalid()) {
|
|
|
1591 TPA.Commit();
|
|
|
1592 return TemplateTemplateArgument;
|
|
|
1593 }
|
|
|
1594
|
|
|
1595 // Revert this tentative parse to parse a non-type template argument.
|
|
|
1596 TPA.Revert();
|
|
|
1597 }
|
|
|
1598
|
|
|
1599 // Parse a non-type template argument.
|
|
|
1600 SourceLocation Loc = Tok.getLocation();
|
|
|
1601 ExprResult ExprArg = ParseConstantExpressionInExprEvalContext(MaybeTypeCast);
|
|
|
1602 if (ExprArg.isInvalid() || !ExprArg.get()) {
|
|
|
1603 return ParsedTemplateArgument();
|
|
|
1604 }
|
|
|
1605
|
|
|
1606 return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
|
|
|
1607 ExprArg.get(), Loc);
|
|
|
1608 }
|
|
|
1609
|
|
|
1610 /// ParseTemplateArgumentList - Parse a C++ template-argument-list
|
|
|
1611 /// (C++ [temp.names]). Returns true if there was an error.
|
|
|
1612 ///
|
|
|
1613 /// template-argument-list: [C++ 14.2]
|
|
|
1614 /// template-argument
|
|
|
1615 /// template-argument-list ',' template-argument
|
|
236
|
1616 ///
|
|
|
1617 /// \param Template is only used for code completion, and may be null.
|
|
|
1618 bool Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs,
|
|
|
1619 TemplateTy Template,
|
|
|
1620 SourceLocation OpenLoc) {
|
|
150
|
1621
|
|
|
1622 ColonProtectionRAIIObject ColonProtection(*this, false);
|
|
|
1623
|
|
236
|
1624 auto RunSignatureHelp = [&] {
|
|
|
1625 if (!Template)
|
|
|
1626 return QualType();
|
|
|
1627 CalledSignatureHelp = true;
|
|
|
1628 return Actions.ProduceTemplateArgumentSignatureHelp(Template, TemplateArgs,
|
|
|
1629 OpenLoc);
|
|
|
1630 };
|
|
|
1631
|
|
150
|
1632 do {
|
|
236
|
1633 PreferredType.enterFunctionArgument(Tok.getLocation(), RunSignatureHelp);
|
|
150
|
1634 ParsedTemplateArgument Arg = ParseTemplateArgument();
|
|
|
1635 SourceLocation EllipsisLoc;
|
|
|
1636 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
1637 Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
|
|
|
1638
|
|
236
|
1639 if (Arg.isInvalid()) {
|
|
|
1640 if (PP.isCodeCompletionReached() && !CalledSignatureHelp)
|
|
|
1641 RunSignatureHelp();
|
|
150
|
1642 return true;
|
|
236
|
1643 }
|
|
150
|
1644
|
|
|
1645 // Save this template argument.
|
|
|
1646 TemplateArgs.push_back(Arg);
|
|
|
1647
|
|
|
1648 // If the next token is a comma, consume it and keep reading
|
|
|
1649 // arguments.
|
|
|
1650 } while (TryConsumeToken(tok::comma));
|
|
|
1651
|
|
|
1652 return false;
|
|
|
1653 }
|
|
|
1654
|
|
|
1655 /// Parse a C++ explicit template instantiation
|
|
|
1656 /// (C++ [temp.explicit]).
|
|
|
1657 ///
|
|
|
1658 /// explicit-instantiation:
|
|
|
1659 /// 'extern' [opt] 'template' declaration
|
|
|
1660 ///
|
|
|
1661 /// Note that the 'extern' is a GNU extension and C++11 feature.
|
|
|
1662 Decl *Parser::ParseExplicitInstantiation(DeclaratorContext Context,
|
|
|
1663 SourceLocation ExternLoc,
|
|
|
1664 SourceLocation TemplateLoc,
|
|
|
1665 SourceLocation &DeclEnd,
|
|
|
1666 ParsedAttributes &AccessAttrs,
|
|
|
1667 AccessSpecifier AS) {
|
|
|
1668 // This isn't really required here.
|
|
|
1669 ParsingDeclRAIIObject
|
|
|
1670 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
|
|
|
1671
|
|
|
1672 return ParseSingleDeclarationAfterTemplate(
|
|
|
1673 Context, ParsedTemplateInfo(ExternLoc, TemplateLoc),
|
|
|
1674 ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
|
|
|
1675 }
|
|
|
1676
|
|
|
1677 SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
|
|
|
1678 if (TemplateParams)
|
|
|
1679 return getTemplateParamsRange(TemplateParams->data(),
|
|
|
1680 TemplateParams->size());
|
|
|
1681
|
|
|
1682 SourceRange R(TemplateLoc);
|
|
|
1683 if (ExternLoc.isValid())
|
|
|
1684 R.setBegin(ExternLoc);
|
|
|
1685 return R;
|
|
|
1686 }
|
|
|
1687
|
|
|
1688 void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
|
|
|
1689 ((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
|
|
|
1690 }
|
|
|
1691
|
|
|
1692 /// Late parse a C++ function template in Microsoft mode.
|
|
|
1693 void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
|
|
|
1694 if (!LPT.D)
|
|
|
1695 return;
|
|
|
1696
|
|
173
|
1697 // Destroy TemplateIdAnnotations when we're done, if possible.
|
|
|
1698 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
|
|
|
1699
|
|
150
|
1700 // Get the FunctionDecl.
|
|
|
1701 FunctionDecl *FunD = LPT.D->getAsFunction();
|
|
|
1702 // Track template parameter depth.
|
|
|
1703 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
|
|
|
1704
|
|
|
1705 // To restore the context after late parsing.
|
|
|
1706 Sema::ContextRAII GlobalSavedContext(
|
|
|
1707 Actions, Actions.Context.getTranslationUnitDecl());
|
|
|
1708
|
|
221
|
1709 MultiParseScope Scopes(*this);
|
|
|
1710
|
|
|
1711 // Get the list of DeclContexts to reenter.
|
|
|
1712 SmallVector<DeclContext*, 4> DeclContextsToReenter;
|
|
|
1713 for (DeclContext *DC = FunD; DC && !DC->isTranslationUnit();
|
|
|
1714 DC = DC->getLexicalParent())
|
|
|
1715 DeclContextsToReenter.push_back(DC);
|
|
150
|
1716
|
|
221
|
1717 // Reenter scopes from outermost to innermost.
|
|
|
1718 for (DeclContext *DC : reverse(DeclContextsToReenter)) {
|
|
|
1719 CurTemplateDepthTracker.addDepth(
|
|
|
1720 ReenterTemplateScopes(Scopes, cast<Decl>(DC)));
|
|
|
1721 Scopes.Enter(Scope::DeclScope);
|
|
|
1722 // We'll reenter the function context itself below.
|
|
|
1723 if (DC != FunD)
|
|
|
1724 Actions.PushDeclContext(Actions.getCurScope(), DC);
|
|
150
|
1725 }
|
|
|
1726
|
|
|
1727 assert(!LPT.Toks.empty() && "Empty body!");
|
|
|
1728
|
|
|
1729 // Append the current token at the end of the new token stream so that it
|
|
|
1730 // doesn't get lost.
|
|
|
1731 LPT.Toks.push_back(Tok);
|
|
|
1732 PP.EnterTokenStream(LPT.Toks, true, /*IsReinject*/true);
|
|
|
1733
|
|
|
1734 // Consume the previously pushed token.
|
|
|
1735 ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
|
|
|
1736 assert(Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&
|
|
|
1737 "Inline method not starting with '{', ':' or 'try'");
|
|
|
1738
|
|
|
1739 // Parse the method body. Function body parsing code is similar enough
|
|
|
1740 // to be re-used for method bodies as well.
|
|
|
1741 ParseScope FnScope(this, Scope::FnScope | Scope::DeclScope |
|
|
|
1742 Scope::CompoundStmtScope);
|
|
|
1743
|
|
|
1744 // Recreate the containing function DeclContext.
|
|
221
|
1745 Sema::ContextRAII FunctionSavedContext(Actions, FunD->getLexicalParent());
|
|
150
|
1746
|
|
|
1747 Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
|
|
|
1748
|
|
|
1749 if (Tok.is(tok::kw_try)) {
|
|
|
1750 ParseFunctionTryBlock(LPT.D, FnScope);
|
|
|
1751 } else {
|
|
|
1752 if (Tok.is(tok::colon))
|
|
|
1753 ParseConstructorInitializer(LPT.D);
|
|
|
1754 else
|
|
|
1755 Actions.ActOnDefaultCtorInitializers(LPT.D);
|
|
|
1756
|
|
|
1757 if (Tok.is(tok::l_brace)) {
|
|
|
1758 assert((!isa<FunctionTemplateDecl>(LPT.D) ||
|
|
|
1759 cast<FunctionTemplateDecl>(LPT.D)
|
|
|
1760 ->getTemplateParameters()
|
|
|
1761 ->getDepth() == TemplateParameterDepth - 1) &&
|
|
|
1762 "TemplateParameterDepth should be greater than the depth of "
|
|
|
1763 "current template being instantiated!");
|
|
|
1764 ParseFunctionStatementBody(LPT.D, FnScope);
|
|
|
1765 Actions.UnmarkAsLateParsedTemplate(FunD);
|
|
|
1766 } else
|
|
|
1767 Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
|
|
|
1768 }
|
|
|
1769 }
|
|
|
1770
|
|
|
1771 /// Lex a delayed template function for late parsing.
|
|
|
1772 void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
|
|
|
1773 tok::TokenKind kind = Tok.getKind();
|
|
|
1774 if (!ConsumeAndStoreFunctionPrologue(Toks)) {
|
|
|
1775 // Consume everything up to (and including) the matching right brace.
|
|
|
1776 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
|
|
|
1777 }
|
|
|
1778
|
|
|
1779 // If we're in a function-try-block, we need to store all the catch blocks.
|
|
|
1780 if (kind == tok::kw_try) {
|
|
|
1781 while (Tok.is(tok::kw_catch)) {
|
|
|
1782 ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
|
|
|
1783 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
|
|
|
1784 }
|
|
|
1785 }
|
|
|
1786 }
|
|
|
1787
|
|
|
1788 /// We've parsed something that could plausibly be intended to be a template
|
|
|
1789 /// name (\p LHS) followed by a '<' token, and the following code can't possibly
|
|
|
1790 /// be an expression. Determine if this is likely to be a template-id and if so,
|
|
|
1791 /// diagnose it.
|
|
|
1792 bool Parser::diagnoseUnknownTemplateId(ExprResult LHS, SourceLocation Less) {
|
|
|
1793 TentativeParsingAction TPA(*this);
|
|
|
1794 // FIXME: We could look at the token sequence in a lot more detail here.
|
|
|
1795 if (SkipUntil(tok::greater, tok::greatergreater, tok::greatergreatergreater,
|
|
|
1796 StopAtSemi | StopBeforeMatch)) {
|
|
|
1797 TPA.Commit();
|
|
|
1798
|
|
|
1799 SourceLocation Greater;
|
|
173
|
1800 ParseGreaterThanInTemplateList(Less, Greater, true, false);
|
|
150
|
1801 Actions.diagnoseExprIntendedAsTemplateName(getCurScope(), LHS,
|
|
|
1802 Less, Greater);
|
|
|
1803 return true;
|
|
|
1804 }
|
|
|
1805
|
|
|
1806 // There's no matching '>' token, this probably isn't supposed to be
|
|
|
1807 // interpreted as a template-id. Parse it as an (ill-formed) comparison.
|
|
|
1808 TPA.Revert();
|
|
|
1809 return false;
|
|
|
1810 }
|
|
|
1811
|
|
|
1812 void Parser::checkPotentialAngleBracket(ExprResult &PotentialTemplateName) {
|
|
|
1813 assert(Tok.is(tok::less) && "not at a potential angle bracket");
|
|
|
1814
|
|
|
1815 bool DependentTemplateName = false;
|
|
|
1816 if (!Actions.mightBeIntendedToBeTemplateName(PotentialTemplateName,
|
|
|
1817 DependentTemplateName))
|
|
|
1818 return;
|
|
|
1819
|
|
|
1820 // OK, this might be a name that the user intended to be parsed as a
|
|
|
1821 // template-name, followed by a '<' token. Check for some easy cases.
|
|
|
1822
|
|
|
1823 // If we have potential_template<>, then it's supposed to be a template-name.
|
|
|
1824 if (NextToken().is(tok::greater) ||
|
|
|
1825 (getLangOpts().CPlusPlus11 &&
|
|
|
1826 NextToken().isOneOf(tok::greatergreater, tok::greatergreatergreater))) {
|
|
|
1827 SourceLocation Less = ConsumeToken();
|
|
|
1828 SourceLocation Greater;
|
|
173
|
1829 ParseGreaterThanInTemplateList(Less, Greater, true, false);
|
|
150
|
1830 Actions.diagnoseExprIntendedAsTemplateName(
|
|
|
1831 getCurScope(), PotentialTemplateName, Less, Greater);
|
|
|
1832 // FIXME: Perform error recovery.
|
|
|
1833 PotentialTemplateName = ExprError();
|
|
|
1834 return;
|
|
|
1835 }
|
|
|
1836
|
|
|
1837 // If we have 'potential_template<type-id', assume it's supposed to be a
|
|
|
1838 // template-name if there's a matching '>' later on.
|
|
|
1839 {
|
|
|
1840 // FIXME: Avoid the tentative parse when NextToken() can't begin a type.
|
|
|
1841 TentativeParsingAction TPA(*this);
|
|
|
1842 SourceLocation Less = ConsumeToken();
|
|
|
1843 if (isTypeIdUnambiguously() &&
|
|
|
1844 diagnoseUnknownTemplateId(PotentialTemplateName, Less)) {
|
|
|
1845 TPA.Commit();
|
|
|
1846 // FIXME: Perform error recovery.
|
|
|
1847 PotentialTemplateName = ExprError();
|
|
|
1848 return;
|
|
|
1849 }
|
|
|
1850 TPA.Revert();
|
|
|
1851 }
|
|
|
1852
|
|
|
1853 // Otherwise, remember that we saw this in case we see a potentially-matching
|
|
|
1854 // '>' token later on.
|
|
|
1855 AngleBracketTracker::Priority Priority =
|
|
|
1856 (DependentTemplateName ? AngleBracketTracker::DependentName
|
|
|
1857 : AngleBracketTracker::PotentialTypo) |
|
|
|
1858 (Tok.hasLeadingSpace() ? AngleBracketTracker::SpaceBeforeLess
|
|
|
1859 : AngleBracketTracker::NoSpaceBeforeLess);
|
|
|
1860 AngleBrackets.add(*this, PotentialTemplateName.get(), Tok.getLocation(),
|
|
|
1861 Priority);
|
|
|
1862 }
|
|
|
1863
|
|
|
1864 bool Parser::checkPotentialAngleBracketDelimiter(
|
|
|
1865 const AngleBracketTracker::Loc &LAngle, const Token &OpToken) {
|
|
|
1866 // If a comma in an expression context is followed by a type that can be a
|
|
|
1867 // template argument and cannot be an expression, then this is ill-formed,
|
|
|
1868 // but might be intended to be part of a template-id.
|
|
|
1869 if (OpToken.is(tok::comma) && isTypeIdUnambiguously() &&
|
|
|
1870 diagnoseUnknownTemplateId(LAngle.TemplateName, LAngle.LessLoc)) {
|
|
|
1871 AngleBrackets.clear(*this);
|
|
|
1872 return true;
|
|
|
1873 }
|
|
|
1874
|
|
|
1875 // If a context that looks like a template-id is followed by '()', then
|
|
|
1876 // this is ill-formed, but might be intended to be a template-id
|
|
|
1877 // followed by '()'.
|
|
|
1878 if (OpToken.is(tok::greater) && Tok.is(tok::l_paren) &&
|
|
|
1879 NextToken().is(tok::r_paren)) {
|
|
|
1880 Actions.diagnoseExprIntendedAsTemplateName(
|
|
|
1881 getCurScope(), LAngle.TemplateName, LAngle.LessLoc,
|
|
|
1882 OpToken.getLocation());
|
|
|
1883 AngleBrackets.clear(*this);
|
|
|
1884 return true;
|
|
|
1885 }
|
|
|
1886
|
|
|
1887 // After a '>' (etc), we're no longer potentially in a construct that's
|
|
|
1888 // intended to be treated as a template-id.
|
|
|
1889 if (OpToken.is(tok::greater) ||
|
|
|
1890 (getLangOpts().CPlusPlus11 &&
|
|
|
1891 OpToken.isOneOf(tok::greatergreater, tok::greatergreatergreater)))
|
|
|
1892 AngleBrackets.clear(*this);
|
|
|
1893 return false;
|
|
|
1894 }
|
