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1 //===--- ParseTemplate.cpp - Template Parsing -----------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file implements parsing of C++ templates.
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "clang/AST/ASTContext.h"
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14 #include "clang/AST/DeclTemplate.h"
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15 #include "clang/AST/ExprCXX.h"
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16 #include "clang/Parse/ParseDiagnostic.h"
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17 #include "clang/Parse/Parser.h"
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18 #include "clang/Parse/RAIIObjectsForParser.h"
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19 #include "clang/Sema/DeclSpec.h"
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20 #include "clang/Sema/ParsedTemplate.h"
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21 #include "clang/Sema/Scope.h"
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22 #include "llvm/Support/TimeProfiler.h"
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23 using namespace clang;
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24
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221
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25 /// Re-enter a possible template scope, creating as many template parameter
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26 /// scopes as necessary.
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27 /// \return The number of template parameter scopes entered.
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28 unsigned Parser::ReenterTemplateScopes(MultiParseScope &S, Decl *D) {
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29 return Actions.ActOnReenterTemplateScope(D, [&] {
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30 S.Enter(Scope::TemplateParamScope);
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31 return Actions.getCurScope();
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32 });
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33 }
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34
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150
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35 /// Parse a template declaration, explicit instantiation, or
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36 /// explicit specialization.
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37 Decl *Parser::ParseDeclarationStartingWithTemplate(
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38 DeclaratorContext Context, SourceLocation &DeclEnd,
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39 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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40 ObjCDeclContextSwitch ObjCDC(*this);
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41
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42 if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
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43 return ParseExplicitInstantiation(Context, SourceLocation(), ConsumeToken(),
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44 DeclEnd, AccessAttrs, AS);
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45 }
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46 return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AccessAttrs,
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47 AS);
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48 }
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49
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50 /// Parse a template declaration or an explicit specialization.
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51 ///
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52 /// Template declarations include one or more template parameter lists
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53 /// and either the function or class template declaration. Explicit
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54 /// specializations contain one or more 'template < >' prefixes
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55 /// followed by a (possibly templated) declaration. Since the
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56 /// syntactic form of both features is nearly identical, we parse all
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57 /// of the template headers together and let semantic analysis sort
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58 /// the declarations from the explicit specializations.
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59 ///
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60 /// template-declaration: [C++ temp]
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61 /// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
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62 ///
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63 /// template-declaration: [C++2a]
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64 /// template-head declaration
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65 /// template-head concept-definition
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66 ///
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67 /// TODO: requires-clause
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68 /// template-head: [C++2a]
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69 /// 'template' '<' template-parameter-list '>'
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70 /// requires-clause[opt]
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71 ///
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72 /// explicit-specialization: [ C++ temp.expl.spec]
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73 /// 'template' '<' '>' declaration
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74 Decl *Parser::ParseTemplateDeclarationOrSpecialization(
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75 DeclaratorContext Context, SourceLocation &DeclEnd,
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76 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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77 assert(Tok.isOneOf(tok::kw_export, tok::kw_template) &&
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78 "Token does not start a template declaration.");
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79
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221
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80 MultiParseScope TemplateParamScopes(*this);
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150
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81
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82 // Tell the action that names should be checked in the context of
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83 // the declaration to come.
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84 ParsingDeclRAIIObject
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85 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
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86
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87 // Parse multiple levels of template headers within this template
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88 // parameter scope, e.g.,
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89 //
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90 // template<typename T>
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91 // template<typename U>
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92 // class A<T>::B { ... };
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93 //
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94 // We parse multiple levels non-recursively so that we can build a
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95 // single data structure containing all of the template parameter
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96 // lists to easily differentiate between the case above and:
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97 //
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98 // template<typename T>
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99 // class A {
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100 // template<typename U> class B;
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101 // };
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102 //
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103 // In the first case, the action for declaring A<T>::B receives
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104 // both template parameter lists. In the second case, the action for
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105 // defining A<T>::B receives just the inner template parameter list
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106 // (and retrieves the outer template parameter list from its
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107 // context).
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108 bool isSpecialization = true;
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109 bool LastParamListWasEmpty = false;
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110 TemplateParameterLists ParamLists;
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111 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
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112
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113 do {
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114 // Consume the 'export', if any.
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115 SourceLocation ExportLoc;
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116 TryConsumeToken(tok::kw_export, ExportLoc);
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117
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118 // Consume the 'template', which should be here.
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119 SourceLocation TemplateLoc;
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120 if (!TryConsumeToken(tok::kw_template, TemplateLoc)) {
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121 Diag(Tok.getLocation(), diag::err_expected_template);
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122 return nullptr;
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123 }
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124
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125 // Parse the '<' template-parameter-list '>'
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126 SourceLocation LAngleLoc, RAngleLoc;
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127 SmallVector<NamedDecl*, 4> TemplateParams;
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221
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128 if (ParseTemplateParameters(TemplateParamScopes,
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129 CurTemplateDepthTracker.getDepth(),
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150
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130 TemplateParams, LAngleLoc, RAngleLoc)) {
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131 // Skip until the semi-colon or a '}'.
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132 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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133 TryConsumeToken(tok::semi);
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134 return nullptr;
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135 }
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136
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137 ExprResult OptionalRequiresClauseConstraintER;
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138 if (!TemplateParams.empty()) {
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139 isSpecialization = false;
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140 ++CurTemplateDepthTracker;
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141
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142 if (TryConsumeToken(tok::kw_requires)) {
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143 OptionalRequiresClauseConstraintER =
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221
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144 Actions.ActOnRequiresClause(ParseConstraintLogicalOrExpression(
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145 /*IsTrailingRequiresClause=*/false));
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150
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146 if (!OptionalRequiresClauseConstraintER.isUsable()) {
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147 // Skip until the semi-colon or a '}'.
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148 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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149 TryConsumeToken(tok::semi);
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150 return nullptr;
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151 }
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152 }
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153 } else {
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154 LastParamListWasEmpty = true;
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155 }
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156
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157 ParamLists.push_back(Actions.ActOnTemplateParameterList(
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158 CurTemplateDepthTracker.getDepth(), ExportLoc, TemplateLoc, LAngleLoc,
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159 TemplateParams, RAngleLoc, OptionalRequiresClauseConstraintER.get()));
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160 } while (Tok.isOneOf(tok::kw_export, tok::kw_template));
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161
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162 // Parse the actual template declaration.
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163 if (Tok.is(tok::kw_concept))
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164 return ParseConceptDefinition(
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165 ParsedTemplateInfo(&ParamLists, isSpecialization,
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166 LastParamListWasEmpty),
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167 DeclEnd);
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168
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169 return ParseSingleDeclarationAfterTemplate(
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170 Context,
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171 ParsedTemplateInfo(&ParamLists, isSpecialization, LastParamListWasEmpty),
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172 ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
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173 }
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174
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175 /// Parse a single declaration that declares a template,
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176 /// template specialization, or explicit instantiation of a template.
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177 ///
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178 /// \param DeclEnd will receive the source location of the last token
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179 /// within this declaration.
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180 ///
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181 /// \param AS the access specifier associated with this
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182 /// declaration. Will be AS_none for namespace-scope declarations.
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183 ///
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184 /// \returns the new declaration.
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185 Decl *Parser::ParseSingleDeclarationAfterTemplate(
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186 DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo,
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187 ParsingDeclRAIIObject &DiagsFromTParams, SourceLocation &DeclEnd,
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188 ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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189 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
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190 "Template information required");
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191
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192 if (Tok.is(tok::kw_static_assert)) {
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193 // A static_assert declaration may not be templated.
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194 Diag(Tok.getLocation(), diag::err_templated_invalid_declaration)
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195 << TemplateInfo.getSourceRange();
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196 // Parse the static_assert declaration to improve error recovery.
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197 return ParseStaticAssertDeclaration(DeclEnd);
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198 }
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199
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221
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200 if (Context == DeclaratorContext::Member) {
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150
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201 // We are parsing a member template.
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202 ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
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203 &DiagsFromTParams);
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204 return nullptr;
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205 }
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206
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207 ParsedAttributesWithRange prefixAttrs(AttrFactory);
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208 MaybeParseCXX11Attributes(prefixAttrs);
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209
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210 if (Tok.is(tok::kw_using)) {
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211 auto usingDeclPtr = ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
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212 prefixAttrs);
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213 if (!usingDeclPtr || !usingDeclPtr.get().isSingleDecl())
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214 return nullptr;
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215 return usingDeclPtr.get().getSingleDecl();
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216 }
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217
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218 // Parse the declaration specifiers, stealing any diagnostics from
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219 // the template parameters.
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220 ParsingDeclSpec DS(*this, &DiagsFromTParams);
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221
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222 ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
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223 getDeclSpecContextFromDeclaratorContext(Context));
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224
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225 if (Tok.is(tok::semi)) {
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226 ProhibitAttributes(prefixAttrs);
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227 DeclEnd = ConsumeToken();
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228 RecordDecl *AnonRecord = nullptr;
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229 Decl *Decl = Actions.ParsedFreeStandingDeclSpec(
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230 getCurScope(), AS, DS,
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231 TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
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232 : MultiTemplateParamsArg(),
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233 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation,
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234 AnonRecord);
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235 assert(!AnonRecord &&
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236 "Anonymous unions/structs should not be valid with template");
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237 DS.complete(Decl);
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238 return Decl;
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239 }
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240
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241 // Move the attributes from the prefix into the DS.
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242 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
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243 ProhibitAttributes(prefixAttrs);
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244 else
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245 DS.takeAttributesFrom(prefixAttrs);
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246
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247 // Parse the declarator.
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248 ParsingDeclarator DeclaratorInfo(*this, DS, (DeclaratorContext)Context);
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249 if (TemplateInfo.TemplateParams)
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250 DeclaratorInfo.setTemplateParameterLists(*TemplateInfo.TemplateParams);
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251 ParseDeclarator(DeclaratorInfo);
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252 // Error parsing the declarator?
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253 if (!DeclaratorInfo.hasName()) {
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254 // If so, skip until the semi-colon or a }.
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255 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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256 if (Tok.is(tok::semi))
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257 ConsumeToken();
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258 return nullptr;
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259 }
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260
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261 llvm::TimeTraceScope TimeScope("ParseTemplate", [&]() {
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262 return std::string(DeclaratorInfo.getIdentifier() != nullptr
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263 ? DeclaratorInfo.getIdentifier()->getName()
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264 : "<unknown>");
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265 });
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266
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267 LateParsedAttrList LateParsedAttrs(true);
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268 if (DeclaratorInfo.isFunctionDeclarator()) {
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269 if (Tok.is(tok::kw_requires))
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270 ParseTrailingRequiresClause(DeclaratorInfo);
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271
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272 MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
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273 }
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274
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275 if (DeclaratorInfo.isFunctionDeclarator() &&
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276 isStartOfFunctionDefinition(DeclaratorInfo)) {
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277
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278 // Function definitions are only allowed at file scope and in C++ classes.
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279 // The C++ inline method definition case is handled elsewhere, so we only
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280 // need to handle the file scope definition case.
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221
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281 if (Context != DeclaratorContext::File) {
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150
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282 Diag(Tok, diag::err_function_definition_not_allowed);
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283 SkipMalformedDecl();
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284 return nullptr;
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285 }
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286
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287 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
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288 // Recover by ignoring the 'typedef'. This was probably supposed to be
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289 // the 'typename' keyword, which we should have already suggested adding
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290 // if it's appropriate.
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291 Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
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292 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
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293 DS.ClearStorageClassSpecs();
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294 }
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295
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296 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
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297 if (DeclaratorInfo.getName().getKind() !=
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298 UnqualifiedIdKind::IK_TemplateId) {
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299 // If the declarator-id is not a template-id, issue a diagnostic and
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300 // recover by ignoring the 'template' keyword.
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301 Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
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302 return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
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303 &LateParsedAttrs);
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304 } else {
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305 SourceLocation LAngleLoc
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306 = PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
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307 Diag(DeclaratorInfo.getIdentifierLoc(),
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308 diag::err_explicit_instantiation_with_definition)
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309 << SourceRange(TemplateInfo.TemplateLoc)
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310 << FixItHint::CreateInsertion(LAngleLoc, "<>");
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311
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312 // Recover as if it were an explicit specialization.
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313 TemplateParameterLists FakedParamLists;
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314 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
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315 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
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316 LAngleLoc, nullptr));
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317
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318 return ParseFunctionDefinition(
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319 DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
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320 /*isSpecialization=*/true,
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321 /*lastParameterListWasEmpty=*/true),
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322 &LateParsedAttrs);
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323 }
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324 }
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325 return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
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326 &LateParsedAttrs);
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327 }
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328
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329 // Parse this declaration.
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330 Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
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331 TemplateInfo);
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332
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333 if (Tok.is(tok::comma)) {
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334 Diag(Tok, diag::err_multiple_template_declarators)
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335 << (int)TemplateInfo.Kind;
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336 SkipUntil(tok::semi);
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337 return ThisDecl;
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338 }
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339
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340 // Eat the semi colon after the declaration.
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341 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
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342 if (LateParsedAttrs.size() > 0)
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343 ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
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344 DeclaratorInfo.complete(ThisDecl);
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345 return ThisDecl;
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346 }
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347
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348 /// \brief Parse a single declaration that declares a concept.
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349 ///
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350 /// \param DeclEnd will receive the source location of the last token
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351 /// within this declaration.
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352 ///
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353 /// \returns the new declaration.
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354 Decl *
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355 Parser::ParseConceptDefinition(const ParsedTemplateInfo &TemplateInfo,
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356 SourceLocation &DeclEnd) {
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357 assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
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358 "Template information required");
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359 assert(Tok.is(tok::kw_concept) &&
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360 "ParseConceptDefinition must be called when at a 'concept' keyword");
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361
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362 ConsumeToken(); // Consume 'concept'
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363
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364 SourceLocation BoolKWLoc;
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365 if (TryConsumeToken(tok::kw_bool, BoolKWLoc))
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366 Diag(Tok.getLocation(), diag::ext_concept_legacy_bool_keyword) <<
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367 FixItHint::CreateRemoval(SourceLocation(BoolKWLoc));
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368
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369 DiagnoseAndSkipCXX11Attributes();
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370
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371 CXXScopeSpec SS;
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173
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372 if (ParseOptionalCXXScopeSpecifier(
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373 SS, /*ObjectType=*/nullptr,
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374 /*ObjectHadErrors=*/false, /*EnteringContext=*/false,
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375 /*MayBePseudoDestructor=*/nullptr,
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376 /*IsTypename=*/false, /*LastII=*/nullptr, /*OnlyNamespace=*/true) ||
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150
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377 SS.isInvalid()) {
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378 SkipUntil(tok::semi);
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379 return nullptr;
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380 }
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381
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382 if (SS.isNotEmpty())
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383 Diag(SS.getBeginLoc(),
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384 diag::err_concept_definition_not_identifier);
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385
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386 UnqualifiedId Result;
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173
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387 if (ParseUnqualifiedId(SS, /*ObjectType=*/nullptr,
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388 /*ObjectHadErrors=*/false, /*EnteringContext=*/false,
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150
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389 /*AllowDestructorName=*/false,
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390 /*AllowConstructorName=*/false,
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391 /*AllowDeductionGuide=*/false,
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173
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392 /*TemplateKWLoc=*/nullptr, Result)) {
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150
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393 SkipUntil(tok::semi);
|
|
|
394 return nullptr;
|
|
|
395 }
|
|
|
396
|
|
|
397 if (Result.getKind() != UnqualifiedIdKind::IK_Identifier) {
|
|
|
398 Diag(Result.getBeginLoc(), diag::err_concept_definition_not_identifier);
|
|
|
399 SkipUntil(tok::semi);
|
|
|
400 return nullptr;
|
|
|
401 }
|
|
|
402
|
|
|
403 IdentifierInfo *Id = Result.Identifier;
|
|
|
404 SourceLocation IdLoc = Result.getBeginLoc();
|
|
|
405
|
|
|
406 DiagnoseAndSkipCXX11Attributes();
|
|
|
407
|
|
|
408 if (!TryConsumeToken(tok::equal)) {
|
|
|
409 Diag(Tok.getLocation(), diag::err_expected) << tok::equal;
|
|
|
410 SkipUntil(tok::semi);
|
|
|
411 return nullptr;
|
|
|
412 }
|
|
|
413
|
|
|
414 ExprResult ConstraintExprResult =
|
|
|
415 Actions.CorrectDelayedTyposInExpr(ParseConstraintExpression());
|
|
|
416 if (ConstraintExprResult.isInvalid()) {
|
|
|
417 SkipUntil(tok::semi);
|
|
|
418 return nullptr;
|
|
|
419 }
|
|
|
420
|
|
|
421 DeclEnd = Tok.getLocation();
|
|
|
422 ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
|
|
|
423 Expr *ConstraintExpr = ConstraintExprResult.get();
|
|
|
424 return Actions.ActOnConceptDefinition(getCurScope(),
|
|
|
425 *TemplateInfo.TemplateParams,
|
|
|
426 Id, IdLoc, ConstraintExpr);
|
|
|
427 }
|
|
|
428
|
|
|
429 /// ParseTemplateParameters - Parses a template-parameter-list enclosed in
|
|
|
430 /// angle brackets. Depth is the depth of this template-parameter-list, which
|
|
|
431 /// is the number of template headers directly enclosing this template header.
|
|
|
432 /// TemplateParams is the current list of template parameters we're building.
|
|
|
433 /// The template parameter we parse will be added to this list. LAngleLoc and
|
|
|
434 /// RAngleLoc will receive the positions of the '<' and '>', respectively,
|
|
|
435 /// that enclose this template parameter list.
|
|
|
436 ///
|
|
|
437 /// \returns true if an error occurred, false otherwise.
|
|
|
438 bool Parser::ParseTemplateParameters(
|
|
221
|
439 MultiParseScope &TemplateScopes, unsigned Depth,
|
|
|
440 SmallVectorImpl<NamedDecl *> &TemplateParams, SourceLocation &LAngleLoc,
|
|
|
441 SourceLocation &RAngleLoc) {
|
|
150
|
442 // Get the template parameter list.
|
|
|
443 if (!TryConsumeToken(tok::less, LAngleLoc)) {
|
|
|
444 Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
|
|
|
445 return true;
|
|
|
446 }
|
|
|
447
|
|
|
448 // Try to parse the template parameter list.
|
|
|
449 bool Failed = false;
|
|
221
|
450 // FIXME: Missing greatergreatergreater support.
|
|
|
451 if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater)) {
|
|
|
452 TemplateScopes.Enter(Scope::TemplateParamScope);
|
|
150
|
453 Failed = ParseTemplateParameterList(Depth, TemplateParams);
|
|
221
|
454 }
|
|
150
|
455
|
|
|
456 if (Tok.is(tok::greatergreater)) {
|
|
|
457 // No diagnostic required here: a template-parameter-list can only be
|
|
|
458 // followed by a declaration or, for a template template parameter, the
|
|
|
459 // 'class' keyword. Therefore, the second '>' will be diagnosed later.
|
|
|
460 // This matters for elegant diagnosis of:
|
|
|
461 // template<template<typename>> struct S;
|
|
|
462 Tok.setKind(tok::greater);
|
|
|
463 RAngleLoc = Tok.getLocation();
|
|
|
464 Tok.setLocation(Tok.getLocation().getLocWithOffset(1));
|
|
|
465 } else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
|
|
|
466 Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
|
|
|
467 return true;
|
|
|
468 }
|
|
|
469 return false;
|
|
|
470 }
|
|
|
471
|
|
|
472 /// ParseTemplateParameterList - Parse a template parameter list. If
|
|
|
473 /// the parsing fails badly (i.e., closing bracket was left out), this
|
|
|
474 /// will try to put the token stream in a reasonable position (closing
|
|
|
475 /// a statement, etc.) and return false.
|
|
|
476 ///
|
|
|
477 /// template-parameter-list: [C++ temp]
|
|
|
478 /// template-parameter
|
|
|
479 /// template-parameter-list ',' template-parameter
|
|
|
480 bool
|
|
|
481 Parser::ParseTemplateParameterList(const unsigned Depth,
|
|
|
482 SmallVectorImpl<NamedDecl*> &TemplateParams) {
|
|
|
483 while (1) {
|
|
|
484
|
|
|
485 if (NamedDecl *TmpParam
|
|
|
486 = ParseTemplateParameter(Depth, TemplateParams.size())) {
|
|
|
487 TemplateParams.push_back(TmpParam);
|
|
|
488 } else {
|
|
|
489 // If we failed to parse a template parameter, skip until we find
|
|
|
490 // a comma or closing brace.
|
|
|
491 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
492 StopAtSemi | StopBeforeMatch);
|
|
|
493 }
|
|
|
494
|
|
|
495 // Did we find a comma or the end of the template parameter list?
|
|
|
496 if (Tok.is(tok::comma)) {
|
|
|
497 ConsumeToken();
|
|
|
498 } else if (Tok.isOneOf(tok::greater, tok::greatergreater)) {
|
|
|
499 // Don't consume this... that's done by template parser.
|
|
|
500 break;
|
|
|
501 } else {
|
|
|
502 // Somebody probably forgot to close the template. Skip ahead and
|
|
|
503 // try to get out of the expression. This error is currently
|
|
|
504 // subsumed by whatever goes on in ParseTemplateParameter.
|
|
|
505 Diag(Tok.getLocation(), diag::err_expected_comma_greater);
|
|
|
506 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
507 StopAtSemi | StopBeforeMatch);
|
|
|
508 return false;
|
|
|
509 }
|
|
|
510 }
|
|
|
511 return true;
|
|
|
512 }
|
|
|
513
|
|
|
514 /// Determine whether the parser is at the start of a template
|
|
|
515 /// type parameter.
|
|
|
516 Parser::TPResult Parser::isStartOfTemplateTypeParameter() {
|
|
|
517 if (Tok.is(tok::kw_class)) {
|
|
|
518 // "class" may be the start of an elaborated-type-specifier or a
|
|
|
519 // type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
|
|
|
520 switch (NextToken().getKind()) {
|
|
|
521 case tok::equal:
|
|
|
522 case tok::comma:
|
|
|
523 case tok::greater:
|
|
|
524 case tok::greatergreater:
|
|
|
525 case tok::ellipsis:
|
|
|
526 return TPResult::True;
|
|
|
527
|
|
|
528 case tok::identifier:
|
|
|
529 // This may be either a type-parameter or an elaborated-type-specifier.
|
|
|
530 // We have to look further.
|
|
|
531 break;
|
|
|
532
|
|
|
533 default:
|
|
|
534 return TPResult::False;
|
|
|
535 }
|
|
|
536
|
|
|
537 switch (GetLookAheadToken(2).getKind()) {
|
|
|
538 case tok::equal:
|
|
|
539 case tok::comma:
|
|
|
540 case tok::greater:
|
|
|
541 case tok::greatergreater:
|
|
|
542 return TPResult::True;
|
|
|
543
|
|
|
544 default:
|
|
|
545 return TPResult::False;
|
|
|
546 }
|
|
|
547 }
|
|
|
548
|
|
|
549 if (TryAnnotateTypeConstraint())
|
|
|
550 return TPResult::Error;
|
|
|
551
|
|
|
552 if (isTypeConstraintAnnotation() &&
|
|
|
553 // Next token might be 'auto' or 'decltype', indicating that this
|
|
|
554 // type-constraint is in fact part of a placeholder-type-specifier of a
|
|
|
555 // non-type template parameter.
|
|
|
556 !GetLookAheadToken(Tok.is(tok::annot_cxxscope) ? 2 : 1)
|
|
|
557 .isOneOf(tok::kw_auto, tok::kw_decltype))
|
|
|
558 return TPResult::True;
|
|
|
559
|
|
|
560 // 'typedef' is a reasonably-common typo/thinko for 'typename', and is
|
|
|
561 // ill-formed otherwise.
|
|
|
562 if (Tok.isNot(tok::kw_typename) && Tok.isNot(tok::kw_typedef))
|
|
|
563 return TPResult::False;
|
|
|
564
|
|
|
565 // C++ [temp.param]p2:
|
|
|
566 // There is no semantic difference between class and typename in a
|
|
|
567 // template-parameter. typename followed by an unqualified-id
|
|
|
568 // names a template type parameter. typename followed by a
|
|
|
569 // qualified-id denotes the type in a non-type
|
|
|
570 // parameter-declaration.
|
|
|
571 Token Next = NextToken();
|
|
|
572
|
|
|
573 // If we have an identifier, skip over it.
|
|
|
574 if (Next.getKind() == tok::identifier)
|
|
|
575 Next = GetLookAheadToken(2);
|
|
|
576
|
|
|
577 switch (Next.getKind()) {
|
|
|
578 case tok::equal:
|
|
|
579 case tok::comma:
|
|
|
580 case tok::greater:
|
|
|
581 case tok::greatergreater:
|
|
|
582 case tok::ellipsis:
|
|
|
583 return TPResult::True;
|
|
|
584
|
|
|
585 case tok::kw_typename:
|
|
|
586 case tok::kw_typedef:
|
|
|
587 case tok::kw_class:
|
|
|
588 // These indicate that a comma was missed after a type parameter, not that
|
|
|
589 // we have found a non-type parameter.
|
|
|
590 return TPResult::True;
|
|
|
591
|
|
|
592 default:
|
|
|
593 return TPResult::False;
|
|
|
594 }
|
|
|
595 }
|
|
|
596
|
|
|
597 /// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
|
|
|
598 ///
|
|
|
599 /// template-parameter: [C++ temp.param]
|
|
|
600 /// type-parameter
|
|
|
601 /// parameter-declaration
|
|
|
602 ///
|
|
|
603 /// type-parameter: (See below)
|
|
|
604 /// type-parameter-key ...[opt] identifier[opt]
|
|
|
605 /// type-parameter-key identifier[opt] = type-id
|
|
|
606 /// (C++2a) type-constraint ...[opt] identifier[opt]
|
|
|
607 /// (C++2a) type-constraint identifier[opt] = type-id
|
|
|
608 /// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
|
609 /// ...[opt] identifier[opt]
|
|
|
610 /// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
|
611 /// identifier[opt] '=' id-expression
|
|
|
612 ///
|
|
|
613 /// type-parameter-key:
|
|
|
614 /// class
|
|
|
615 /// typename
|
|
|
616 ///
|
|
|
617 NamedDecl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
|
|
|
618
|
|
|
619 switch (isStartOfTemplateTypeParameter()) {
|
|
|
620 case TPResult::True:
|
|
|
621 // Is there just a typo in the input code? ('typedef' instead of
|
|
|
622 // 'typename')
|
|
|
623 if (Tok.is(tok::kw_typedef)) {
|
|
|
624 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
|
|
|
625
|
|
|
626 Diag(Tok.getLocation(), diag::note_meant_to_use_typename)
|
|
|
627 << FixItHint::CreateReplacement(CharSourceRange::getCharRange(
|
|
|
628 Tok.getLocation(),
|
|
|
629 Tok.getEndLoc()),
|
|
|
630 "typename");
|
|
|
631
|
|
|
632 Tok.setKind(tok::kw_typename);
|
|
|
633 }
|
|
|
634
|
|
|
635 return ParseTypeParameter(Depth, Position);
|
|
|
636 case TPResult::False:
|
|
|
637 break;
|
|
|
638
|
|
|
639 case TPResult::Error: {
|
|
|
640 // We return an invalid parameter as opposed to null to avoid having bogus
|
|
|
641 // diagnostics about an empty template parameter list.
|
|
|
642 // FIXME: Fix ParseTemplateParameterList to better handle nullptr results
|
|
|
643 // from here.
|
|
|
644 // Return a NTTP as if there was an error in a scope specifier, the user
|
|
|
645 // probably meant to write the type of a NTTP.
|
|
|
646 DeclSpec DS(getAttrFactory());
|
|
|
647 DS.SetTypeSpecError();
|
|
221
|
648 Declarator D(DS, DeclaratorContext::TemplateParam);
|
|
150
|
649 D.SetIdentifier(nullptr, Tok.getLocation());
|
|
|
650 D.setInvalidType(true);
|
|
|
651 NamedDecl *ErrorParam = Actions.ActOnNonTypeTemplateParameter(
|
|
|
652 getCurScope(), D, Depth, Position, /*EqualLoc=*/SourceLocation(),
|
|
|
653 /*DefaultArg=*/nullptr);
|
|
|
654 ErrorParam->setInvalidDecl(true);
|
|
|
655 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
656 StopAtSemi | StopBeforeMatch);
|
|
|
657 return ErrorParam;
|
|
|
658 }
|
|
|
659
|
|
|
660 case TPResult::Ambiguous:
|
|
|
661 llvm_unreachable("template param classification can't be ambiguous");
|
|
|
662 }
|
|
|
663
|
|
|
664 if (Tok.is(tok::kw_template))
|
|
|
665 return ParseTemplateTemplateParameter(Depth, Position);
|
|
|
666
|
|
|
667 // If it's none of the above, then it must be a parameter declaration.
|
|
|
668 // NOTE: This will pick up errors in the closure of the template parameter
|
|
|
669 // list (e.g., template < ; Check here to implement >> style closures.
|
|
|
670 return ParseNonTypeTemplateParameter(Depth, Position);
|
|
|
671 }
|
|
|
672
|
|
|
673 /// Check whether the current token is a template-id annotation denoting a
|
|
|
674 /// type-constraint.
|
|
|
675 bool Parser::isTypeConstraintAnnotation() {
|
|
|
676 const Token &T = Tok.is(tok::annot_cxxscope) ? NextToken() : Tok;
|
|
|
677 if (T.isNot(tok::annot_template_id))
|
|
|
678 return false;
|
|
|
679 const auto *ExistingAnnot =
|
|
|
680 static_cast<TemplateIdAnnotation *>(T.getAnnotationValue());
|
|
|
681 return ExistingAnnot->Kind == TNK_Concept_template;
|
|
|
682 }
|
|
|
683
|
|
|
684 /// Try parsing a type-constraint at the current location.
|
|
|
685 ///
|
|
|
686 /// type-constraint:
|
|
|
687 /// nested-name-specifier[opt] concept-name
|
|
|
688 /// nested-name-specifier[opt] concept-name
|
|
|
689 /// '<' template-argument-list[opt] '>'[opt]
|
|
|
690 ///
|
|
|
691 /// \returns true if an error occurred, and false otherwise.
|
|
|
692 bool Parser::TryAnnotateTypeConstraint() {
|
|
173
|
693 if (!getLangOpts().CPlusPlus20)
|
|
150
|
694 return false;
|
|
|
695 CXXScopeSpec SS;
|
|
|
696 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
|
|
173
|
697 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
|
|
|
698 /*ObjectHadErrors=*/false,
|
|
|
699 /*EnteringContext=*/false,
|
|
|
700 /*MayBePseudoDestructor=*/nullptr,
|
|
|
701 // If this is not a type-constraint, then
|
|
|
702 // this scope-spec is part of the typename
|
|
|
703 // of a non-type template parameter
|
|
|
704 /*IsTypename=*/true, /*LastII=*/nullptr,
|
|
|
705 // We won't find concepts in
|
|
|
706 // non-namespaces anyway, so might as well
|
|
|
707 // parse this correctly for possible type
|
|
|
708 // names.
|
|
|
709 /*OnlyNamespace=*/false))
|
|
150
|
710 return true;
|
|
|
711
|
|
|
712 if (Tok.is(tok::identifier)) {
|
|
|
713 UnqualifiedId PossibleConceptName;
|
|
|
714 PossibleConceptName.setIdentifier(Tok.getIdentifierInfo(),
|
|
|
715 Tok.getLocation());
|
|
|
716
|
|
|
717 TemplateTy PossibleConcept;
|
|
|
718 bool MemberOfUnknownSpecialization = false;
|
|
|
719 auto TNK = Actions.isTemplateName(getCurScope(), SS,
|
|
|
720 /*hasTemplateKeyword=*/false,
|
|
|
721 PossibleConceptName,
|
|
|
722 /*ObjectType=*/ParsedType(),
|
|
|
723 /*EnteringContext=*/false,
|
|
|
724 PossibleConcept,
|
|
173
|
725 MemberOfUnknownSpecialization,
|
|
|
726 /*Disambiguation=*/true);
|
|
150
|
727 if (MemberOfUnknownSpecialization || !PossibleConcept ||
|
|
|
728 TNK != TNK_Concept_template) {
|
|
|
729 if (SS.isNotEmpty())
|
|
|
730 AnnotateScopeToken(SS, !WasScopeAnnotation);
|
|
|
731 return false;
|
|
|
732 }
|
|
|
733
|
|
|
734 // At this point we're sure we're dealing with a constrained parameter. It
|
|
|
735 // may or may not have a template parameter list following the concept
|
|
|
736 // name.
|
|
|
737 if (AnnotateTemplateIdToken(PossibleConcept, TNK, SS,
|
|
|
738 /*TemplateKWLoc=*/SourceLocation(),
|
|
|
739 PossibleConceptName,
|
|
|
740 /*AllowTypeAnnotation=*/false,
|
|
|
741 /*TypeConstraint=*/true))
|
|
|
742 return true;
|
|
|
743 }
|
|
|
744
|
|
|
745 if (SS.isNotEmpty())
|
|
|
746 AnnotateScopeToken(SS, !WasScopeAnnotation);
|
|
|
747 return false;
|
|
|
748 }
|
|
|
749
|
|
|
750 /// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
|
|
|
751 /// Other kinds of template parameters are parsed in
|
|
|
752 /// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
|
|
|
753 ///
|
|
|
754 /// type-parameter: [C++ temp.param]
|
|
|
755 /// 'class' ...[opt][C++0x] identifier[opt]
|
|
|
756 /// 'class' identifier[opt] '=' type-id
|
|
|
757 /// 'typename' ...[opt][C++0x] identifier[opt]
|
|
|
758 /// 'typename' identifier[opt] '=' type-id
|
|
|
759 NamedDecl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
|
|
|
760 assert((Tok.isOneOf(tok::kw_class, tok::kw_typename) ||
|
|
|
761 isTypeConstraintAnnotation()) &&
|
|
|
762 "A type-parameter starts with 'class', 'typename' or a "
|
|
|
763 "type-constraint");
|
|
|
764
|
|
|
765 CXXScopeSpec TypeConstraintSS;
|
|
|
766 TemplateIdAnnotation *TypeConstraint = nullptr;
|
|
|
767 bool TypenameKeyword = false;
|
|
|
768 SourceLocation KeyLoc;
|
|
173
|
769 ParseOptionalCXXScopeSpecifier(TypeConstraintSS, /*ObjectType=*/nullptr,
|
|
|
770 /*ObjectHadErrors=*/false,
|
|
150
|
771 /*EnteringContext*/ false);
|
|
|
772 if (Tok.is(tok::annot_template_id)) {
|
|
|
773 // Consume the 'type-constraint'.
|
|
|
774 TypeConstraint =
|
|
|
775 static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
|
|
|
776 assert(TypeConstraint->Kind == TNK_Concept_template &&
|
|
|
777 "stray non-concept template-id annotation");
|
|
|
778 KeyLoc = ConsumeAnnotationToken();
|
|
|
779 } else {
|
|
|
780 assert(TypeConstraintSS.isEmpty() &&
|
|
|
781 "expected type constraint after scope specifier");
|
|
|
782
|
|
|
783 // Consume the 'class' or 'typename' keyword.
|
|
|
784 TypenameKeyword = Tok.is(tok::kw_typename);
|
|
|
785 KeyLoc = ConsumeToken();
|
|
|
786 }
|
|
|
787
|
|
|
788 // Grab the ellipsis (if given).
|
|
|
789 SourceLocation EllipsisLoc;
|
|
|
790 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
|
|
|
791 Diag(EllipsisLoc,
|
|
|
792 getLangOpts().CPlusPlus11
|
|
|
793 ? diag::warn_cxx98_compat_variadic_templates
|
|
|
794 : diag::ext_variadic_templates);
|
|
|
795 }
|
|
|
796
|
|
|
797 // Grab the template parameter name (if given)
|
|
|
798 SourceLocation NameLoc = Tok.getLocation();
|
|
|
799 IdentifierInfo *ParamName = nullptr;
|
|
|
800 if (Tok.is(tok::identifier)) {
|
|
|
801 ParamName = Tok.getIdentifierInfo();
|
|
|
802 ConsumeToken();
|
|
|
803 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
|
|
|
804 tok::greatergreater)) {
|
|
|
805 // Unnamed template parameter. Don't have to do anything here, just
|
|
|
806 // don't consume this token.
|
|
|
807 } else {
|
|
|
808 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
|
|
|
809 return nullptr;
|
|
|
810 }
|
|
|
811
|
|
|
812 // Recover from misplaced ellipsis.
|
|
|
813 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
|
|
|
814 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
815 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
|
|
|
816
|
|
|
817 // Grab a default argument (if available).
|
|
|
818 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
|
819 // we introduce the type parameter into the local scope.
|
|
|
820 SourceLocation EqualLoc;
|
|
|
821 ParsedType DefaultArg;
|
|
|
822 if (TryConsumeToken(tok::equal, EqualLoc))
|
|
221
|
823 DefaultArg =
|
|
|
824 ParseTypeName(/*Range=*/nullptr, DeclaratorContext::TemplateTypeArg)
|
|
|
825 .get();
|
|
150
|
826
|
|
|
827 NamedDecl *NewDecl = Actions.ActOnTypeParameter(getCurScope(),
|
|
|
828 TypenameKeyword, EllipsisLoc,
|
|
|
829 KeyLoc, ParamName, NameLoc,
|
|
|
830 Depth, Position, EqualLoc,
|
|
|
831 DefaultArg,
|
|
|
832 TypeConstraint != nullptr);
|
|
|
833
|
|
|
834 if (TypeConstraint) {
|
|
|
835 Actions.ActOnTypeConstraint(TypeConstraintSS, TypeConstraint,
|
|
|
836 cast<TemplateTypeParmDecl>(NewDecl),
|
|
|
837 EllipsisLoc);
|
|
|
838 }
|
|
|
839
|
|
|
840 return NewDecl;
|
|
|
841 }
|
|
|
842
|
|
|
843 /// ParseTemplateTemplateParameter - Handle the parsing of template
|
|
|
844 /// template parameters.
|
|
|
845 ///
|
|
|
846 /// type-parameter: [C++ temp.param]
|
|
|
847 /// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
|
848 /// ...[opt] identifier[opt]
|
|
|
849 /// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
|
850 /// identifier[opt] = id-expression
|
|
|
851 /// type-parameter-key:
|
|
|
852 /// 'class'
|
|
|
853 /// 'typename' [C++1z]
|
|
|
854 NamedDecl *
|
|
|
855 Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
|
|
|
856 assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
|
|
|
857
|
|
|
858 // Handle the template <...> part.
|
|
|
859 SourceLocation TemplateLoc = ConsumeToken();
|
|
|
860 SmallVector<NamedDecl*,8> TemplateParams;
|
|
|
861 SourceLocation LAngleLoc, RAngleLoc;
|
|
|
862 {
|
|
221
|
863 MultiParseScope TemplateParmScope(*this);
|
|
|
864 if (ParseTemplateParameters(TemplateParmScope, Depth + 1, TemplateParams,
|
|
|
865 LAngleLoc, RAngleLoc)) {
|
|
150
|
866 return nullptr;
|
|
|
867 }
|
|
|
868 }
|
|
|
869
|
|
|
870 // Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
|
|
|
871 // Generate a meaningful error if the user forgot to put class before the
|
|
|
872 // identifier, comma, or greater. Provide a fixit if the identifier, comma,
|
|
|
873 // or greater appear immediately or after 'struct'. In the latter case,
|
|
|
874 // replace the keyword with 'class'.
|
|
|
875 if (!TryConsumeToken(tok::kw_class)) {
|
|
|
876 bool Replace = Tok.isOneOf(tok::kw_typename, tok::kw_struct);
|
|
|
877 const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
|
|
|
878 if (Tok.is(tok::kw_typename)) {
|
|
|
879 Diag(Tok.getLocation(),
|
|
|
880 getLangOpts().CPlusPlus17
|
|
|
881 ? diag::warn_cxx14_compat_template_template_param_typename
|
|
|
882 : diag::ext_template_template_param_typename)
|
|
|
883 << (!getLangOpts().CPlusPlus17
|
|
|
884 ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
|
|
|
885 : FixItHint());
|
|
|
886 } else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
|
|
|
887 tok::greatergreater, tok::ellipsis)) {
|
|
|
888 Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
|
|
|
889 << (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
|
|
|
890 : FixItHint::CreateInsertion(Tok.getLocation(), "class "));
|
|
|
891 } else
|
|
|
892 Diag(Tok.getLocation(), diag::err_class_on_template_template_param);
|
|
|
893
|
|
|
894 if (Replace)
|
|
|
895 ConsumeToken();
|
|
|
896 }
|
|
|
897
|
|
|
898 // Parse the ellipsis, if given.
|
|
|
899 SourceLocation EllipsisLoc;
|
|
|
900 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
901 Diag(EllipsisLoc,
|
|
|
902 getLangOpts().CPlusPlus11
|
|
|
903 ? diag::warn_cxx98_compat_variadic_templates
|
|
|
904 : diag::ext_variadic_templates);
|
|
|
905
|
|
|
906 // Get the identifier, if given.
|
|
|
907 SourceLocation NameLoc = Tok.getLocation();
|
|
|
908 IdentifierInfo *ParamName = nullptr;
|
|
|
909 if (Tok.is(tok::identifier)) {
|
|
|
910 ParamName = Tok.getIdentifierInfo();
|
|
|
911 ConsumeToken();
|
|
|
912 } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
|
|
|
913 tok::greatergreater)) {
|
|
|
914 // Unnamed template parameter. Don't have to do anything here, just
|
|
|
915 // don't consume this token.
|
|
|
916 } else {
|
|
|
917 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
|
|
|
918 return nullptr;
|
|
|
919 }
|
|
|
920
|
|
|
921 // Recover from misplaced ellipsis.
|
|
|
922 bool AlreadyHasEllipsis = EllipsisLoc.isValid();
|
|
|
923 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
924 DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
|
|
|
925
|
|
|
926 TemplateParameterList *ParamList =
|
|
|
927 Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
|
|
|
928 TemplateLoc, LAngleLoc,
|
|
|
929 TemplateParams,
|
|
|
930 RAngleLoc, nullptr);
|
|
|
931
|
|
|
932 // Grab a default argument (if available).
|
|
|
933 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
|
934 // we introduce the template parameter into the local scope.
|
|
|
935 SourceLocation EqualLoc;
|
|
|
936 ParsedTemplateArgument DefaultArg;
|
|
|
937 if (TryConsumeToken(tok::equal, EqualLoc)) {
|
|
|
938 DefaultArg = ParseTemplateTemplateArgument();
|
|
|
939 if (DefaultArg.isInvalid()) {
|
|
|
940 Diag(Tok.getLocation(),
|
|
|
941 diag::err_default_template_template_parameter_not_template);
|
|
|
942 SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
|
943 StopAtSemi | StopBeforeMatch);
|
|
|
944 }
|
|
|
945 }
|
|
|
946
|
|
|
947 return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
|
|
|
948 ParamList, EllipsisLoc,
|
|
|
949 ParamName, NameLoc, Depth,
|
|
|
950 Position, EqualLoc, DefaultArg);
|
|
|
951 }
|
|
|
952
|
|
|
953 /// ParseNonTypeTemplateParameter - Handle the parsing of non-type
|
|
|
954 /// template parameters (e.g., in "template<int Size> class array;").
|
|
|
955 ///
|
|
|
956 /// template-parameter:
|
|
|
957 /// ...
|
|
|
958 /// parameter-declaration
|
|
|
959 NamedDecl *
|
|
|
960 Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
|
|
|
961 // Parse the declaration-specifiers (i.e., the type).
|
|
|
962 // FIXME: The type should probably be restricted in some way... Not all
|
|
|
963 // declarators (parts of declarators?) are accepted for parameters.
|
|
|
964 DeclSpec DS(AttrFactory);
|
|
|
965 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none,
|
|
|
966 DeclSpecContext::DSC_template_param);
|
|
|
967
|
|
|
968 // Parse this as a typename.
|
|
221
|
969 Declarator ParamDecl(DS, DeclaratorContext::TemplateParam);
|
|
150
|
970 ParseDeclarator(ParamDecl);
|
|
|
971 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
|
|
|
972 Diag(Tok.getLocation(), diag::err_expected_template_parameter);
|
|
|
973 return nullptr;
|
|
|
974 }
|
|
|
975
|
|
|
976 // Recover from misplaced ellipsis.
|
|
|
977 SourceLocation EllipsisLoc;
|
|
|
978 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
979 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
|
|
|
980
|
|
|
981 // If there is a default value, parse it.
|
|
|
982 // Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
|
983 // we introduce the template parameter into the local scope.
|
|
|
984 SourceLocation EqualLoc;
|
|
|
985 ExprResult DefaultArg;
|
|
|
986 if (TryConsumeToken(tok::equal, EqualLoc)) {
|
|
|
987 // C++ [temp.param]p15:
|
|
|
988 // When parsing a default template-argument for a non-type
|
|
|
989 // template-parameter, the first non-nested > is taken as the
|
|
|
990 // end of the template-parameter-list rather than a greater-than
|
|
|
991 // operator.
|
|
|
992 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
|
|
|
993 EnterExpressionEvaluationContext ConstantEvaluated(
|
|
|
994 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
|
|
|
995
|
|
|
996 DefaultArg = Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
|
|
|
997 if (DefaultArg.isInvalid())
|
|
|
998 SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
|
|
|
999 }
|
|
|
1000
|
|
|
1001 // Create the parameter.
|
|
|
1002 return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
|
|
173
|
1003 Depth, Position, EqualLoc,
|
|
150
|
1004 DefaultArg.get());
|
|
|
1005 }
|
|
|
1006
|
|
|
1007 void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
|
|
|
1008 SourceLocation CorrectLoc,
|
|
|
1009 bool AlreadyHasEllipsis,
|
|
|
1010 bool IdentifierHasName) {
|
|
|
1011 FixItHint Insertion;
|
|
|
1012 if (!AlreadyHasEllipsis)
|
|
|
1013 Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
|
|
|
1014 Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
|
|
|
1015 << FixItHint::CreateRemoval(EllipsisLoc) << Insertion
|
|
|
1016 << !IdentifierHasName;
|
|
|
1017 }
|
|
|
1018
|
|
|
1019 void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
|
|
|
1020 Declarator &D) {
|
|
|
1021 assert(EllipsisLoc.isValid());
|
|
|
1022 bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
|
|
|
1023 if (!AlreadyHasEllipsis)
|
|
|
1024 D.setEllipsisLoc(EllipsisLoc);
|
|
|
1025 DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
|
|
|
1026 AlreadyHasEllipsis, D.hasName());
|
|
|
1027 }
|
|
|
1028
|
|
|
1029 /// Parses a '>' at the end of a template list.
|
|
|
1030 ///
|
|
|
1031 /// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
|
|
|
1032 /// to determine if these tokens were supposed to be a '>' followed by
|
|
|
1033 /// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
|
|
|
1034 ///
|
|
|
1035 /// \param RAngleLoc the location of the consumed '>'.
|
|
|
1036 ///
|
|
|
1037 /// \param ConsumeLastToken if true, the '>' is consumed.
|
|
|
1038 ///
|
|
|
1039 /// \param ObjCGenericList if true, this is the '>' closing an Objective-C
|
|
|
1040 /// type parameter or type argument list, rather than a C++ template parameter
|
|
|
1041 /// or argument list.
|
|
|
1042 ///
|
|
|
1043 /// \returns true, if current token does not start with '>', false otherwise.
|
|
173
|
1044 bool Parser::ParseGreaterThanInTemplateList(SourceLocation LAngleLoc,
|
|
|
1045 SourceLocation &RAngleLoc,
|
|
150
|
1046 bool ConsumeLastToken,
|
|
|
1047 bool ObjCGenericList) {
|
|
|
1048 // What will be left once we've consumed the '>'.
|
|
|
1049 tok::TokenKind RemainingToken;
|
|
|
1050 const char *ReplacementStr = "> >";
|
|
|
1051 bool MergeWithNextToken = false;
|
|
|
1052
|
|
|
1053 switch (Tok.getKind()) {
|
|
|
1054 default:
|
|
173
|
1055 Diag(getEndOfPreviousToken(), diag::err_expected) << tok::greater;
|
|
|
1056 Diag(LAngleLoc, diag::note_matching) << tok::less;
|
|
150
|
1057 return true;
|
|
|
1058
|
|
|
1059 case tok::greater:
|
|
|
1060 // Determine the location of the '>' token. Only consume this token
|
|
|
1061 // if the caller asked us to.
|
|
|
1062 RAngleLoc = Tok.getLocation();
|
|
|
1063 if (ConsumeLastToken)
|
|
|
1064 ConsumeToken();
|
|
|
1065 return false;
|
|
|
1066
|
|
|
1067 case tok::greatergreater:
|
|
|
1068 RemainingToken = tok::greater;
|
|
|
1069 break;
|
|
|
1070
|
|
|
1071 case tok::greatergreatergreater:
|
|
|
1072 RemainingToken = tok::greatergreater;
|
|
|
1073 break;
|
|
|
1074
|
|
|
1075 case tok::greaterequal:
|
|
|
1076 RemainingToken = tok::equal;
|
|
|
1077 ReplacementStr = "> =";
|
|
|
1078
|
|
|
1079 // Join two adjacent '=' tokens into one, for cases like:
|
|
|
1080 // void (*p)() = f<int>;
|
|
|
1081 // return f<int>==p;
|
|
|
1082 if (NextToken().is(tok::equal) &&
|
|
|
1083 areTokensAdjacent(Tok, NextToken())) {
|
|
|
1084 RemainingToken = tok::equalequal;
|
|
|
1085 MergeWithNextToken = true;
|
|
|
1086 }
|
|
|
1087 break;
|
|
|
1088
|
|
|
1089 case tok::greatergreaterequal:
|
|
|
1090 RemainingToken = tok::greaterequal;
|
|
|
1091 break;
|
|
|
1092 }
|
|
|
1093
|
|
|
1094 // This template-id is terminated by a token that starts with a '>'.
|
|
|
1095 // Outside C++11 and Objective-C, this is now error recovery.
|
|
|
1096 //
|
|
|
1097 // C++11 allows this when the token is '>>', and in CUDA + C++11 mode, we
|
|
|
1098 // extend that treatment to also apply to the '>>>' token.
|
|
|
1099 //
|
|
|
1100 // Objective-C allows this in its type parameter / argument lists.
|
|
|
1101
|
|
|
1102 SourceLocation TokBeforeGreaterLoc = PrevTokLocation;
|
|
|
1103 SourceLocation TokLoc = Tok.getLocation();
|
|
|
1104 Token Next = NextToken();
|
|
|
1105
|
|
|
1106 // Whether splitting the current token after the '>' would undesirably result
|
|
|
1107 // in the remaining token pasting with the token after it. This excludes the
|
|
|
1108 // MergeWithNextToken cases, which we've already handled.
|
|
|
1109 bool PreventMergeWithNextToken =
|
|
|
1110 (RemainingToken == tok::greater ||
|
|
|
1111 RemainingToken == tok::greatergreater) &&
|
|
|
1112 (Next.isOneOf(tok::greater, tok::greatergreater,
|
|
|
1113 tok::greatergreatergreater, tok::equal, tok::greaterequal,
|
|
|
1114 tok::greatergreaterequal, tok::equalequal)) &&
|
|
|
1115 areTokensAdjacent(Tok, Next);
|
|
|
1116
|
|
|
1117 // Diagnose this situation as appropriate.
|
|
|
1118 if (!ObjCGenericList) {
|
|
|
1119 // The source range of the replaced token(s).
|
|
|
1120 CharSourceRange ReplacementRange = CharSourceRange::getCharRange(
|
|
|
1121 TokLoc, Lexer::AdvanceToTokenCharacter(TokLoc, 2, PP.getSourceManager(),
|
|
|
1122 getLangOpts()));
|
|
|
1123
|
|
|
1124 // A hint to put a space between the '>>'s. In order to make the hint as
|
|
|
1125 // clear as possible, we include the characters either side of the space in
|
|
|
1126 // the replacement, rather than just inserting a space at SecondCharLoc.
|
|
|
1127 FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
|
|
|
1128 ReplacementStr);
|
|
|
1129
|
|
|
1130 // A hint to put another space after the token, if it would otherwise be
|
|
|
1131 // lexed differently.
|
|
|
1132 FixItHint Hint2;
|
|
|
1133 if (PreventMergeWithNextToken)
|
|
|
1134 Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
|
|
|
1135
|
|
|
1136 unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
|
|
|
1137 if (getLangOpts().CPlusPlus11 &&
|
|
|
1138 (Tok.is(tok::greatergreater) || Tok.is(tok::greatergreatergreater)))
|
|
|
1139 DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
|
|
|
1140 else if (Tok.is(tok::greaterequal))
|
|
|
1141 DiagId = diag::err_right_angle_bracket_equal_needs_space;
|
|
|
1142 Diag(TokLoc, DiagId) << Hint1 << Hint2;
|
|
|
1143 }
|
|
|
1144
|
|
|
1145 // Find the "length" of the resulting '>' token. This is not always 1, as it
|
|
|
1146 // can contain escaped newlines.
|
|
|
1147 unsigned GreaterLength = Lexer::getTokenPrefixLength(
|
|
|
1148 TokLoc, 1, PP.getSourceManager(), getLangOpts());
|
|
|
1149
|
|
|
1150 // Annotate the source buffer to indicate that we split the token after the
|
|
|
1151 // '>'. This allows us to properly find the end of, and extract the spelling
|
|
|
1152 // of, the '>' token later.
|
|
|
1153 RAngleLoc = PP.SplitToken(TokLoc, GreaterLength);
|
|
|
1154
|
|
|
1155 // Strip the initial '>' from the token.
|
|
|
1156 bool CachingTokens = PP.IsPreviousCachedToken(Tok);
|
|
|
1157
|
|
|
1158 Token Greater = Tok;
|
|
|
1159 Greater.setLocation(RAngleLoc);
|
|
|
1160 Greater.setKind(tok::greater);
|
|
|
1161 Greater.setLength(GreaterLength);
|
|
|
1162
|
|
|
1163 unsigned OldLength = Tok.getLength();
|
|
|
1164 if (MergeWithNextToken) {
|
|
|
1165 ConsumeToken();
|
|
|
1166 OldLength += Tok.getLength();
|
|
|
1167 }
|
|
|
1168
|
|
|
1169 Tok.setKind(RemainingToken);
|
|
|
1170 Tok.setLength(OldLength - GreaterLength);
|
|
|
1171
|
|
|
1172 // Split the second token if lexing it normally would lex a different token
|
|
|
1173 // (eg, the fifth token in 'A<B>>>' should re-lex as '>', not '>>').
|
|
|
1174 SourceLocation AfterGreaterLoc = TokLoc.getLocWithOffset(GreaterLength);
|
|
|
1175 if (PreventMergeWithNextToken)
|
|
|
1176 AfterGreaterLoc = PP.SplitToken(AfterGreaterLoc, Tok.getLength());
|
|
|
1177 Tok.setLocation(AfterGreaterLoc);
|
|
|
1178
|
|
|
1179 // Update the token cache to match what we just did if necessary.
|
|
|
1180 if (CachingTokens) {
|
|
|
1181 // If the previous cached token is being merged, delete it.
|
|
|
1182 if (MergeWithNextToken)
|
|
|
1183 PP.ReplacePreviousCachedToken({});
|
|
|
1184
|
|
|
1185 if (ConsumeLastToken)
|
|
|
1186 PP.ReplacePreviousCachedToken({Greater, Tok});
|
|
|
1187 else
|
|
|
1188 PP.ReplacePreviousCachedToken({Greater});
|
|
|
1189 }
|
|
|
1190
|
|
|
1191 if (ConsumeLastToken) {
|
|
|
1192 PrevTokLocation = RAngleLoc;
|
|
|
1193 } else {
|
|
|
1194 PrevTokLocation = TokBeforeGreaterLoc;
|
|
|
1195 PP.EnterToken(Tok, /*IsReinject=*/true);
|
|
|
1196 Tok = Greater;
|
|
|
1197 }
|
|
|
1198
|
|
|
1199 return false;
|
|
|
1200 }
|
|
|
1201
|
|
|
1202
|
|
|
1203 /// Parses a template-id that after the template name has
|
|
|
1204 /// already been parsed.
|
|
|
1205 ///
|
|
|
1206 /// This routine takes care of parsing the enclosed template argument
|
|
|
1207 /// list ('<' template-parameter-list [opt] '>') and placing the
|
|
|
1208 /// results into a form that can be transferred to semantic analysis.
|
|
|
1209 ///
|
|
|
1210 /// \param ConsumeLastToken if true, then we will consume the last
|
|
|
1211 /// token that forms the template-id. Otherwise, we will leave the
|
|
|
1212 /// last token in the stream (e.g., so that it can be replaced with an
|
|
|
1213 /// annotation token).
|
|
|
1214 bool
|
|
|
1215 Parser::ParseTemplateIdAfterTemplateName(bool ConsumeLastToken,
|
|
|
1216 SourceLocation &LAngleLoc,
|
|
|
1217 TemplateArgList &TemplateArgs,
|
|
|
1218 SourceLocation &RAngleLoc) {
|
|
|
1219 assert(Tok.is(tok::less) && "Must have already parsed the template-name");
|
|
|
1220
|
|
|
1221 // Consume the '<'.
|
|
|
1222 LAngleLoc = ConsumeToken();
|
|
|
1223
|
|
|
1224 // Parse the optional template-argument-list.
|
|
|
1225 bool Invalid = false;
|
|
|
1226 {
|
|
|
1227 GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
|
|
|
1228 if (!Tok.isOneOf(tok::greater, tok::greatergreater,
|
|
|
1229 tok::greatergreatergreater, tok::greaterequal,
|
|
|
1230 tok::greatergreaterequal))
|
|
|
1231 Invalid = ParseTemplateArgumentList(TemplateArgs);
|
|
|
1232
|
|
|
1233 if (Invalid) {
|
|
|
1234 // Try to find the closing '>'.
|
|
173
|
1235 if (getLangOpts().CPlusPlus11)
|
|
|
1236 SkipUntil(tok::greater, tok::greatergreater,
|
|
|
1237 tok::greatergreatergreater, StopAtSemi | StopBeforeMatch);
|
|
150
|
1238 else
|
|
|
1239 SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
|
|
|
1240 }
|
|
|
1241 }
|
|
|
1242
|
|
173
|
1243 return ParseGreaterThanInTemplateList(LAngleLoc, RAngleLoc, ConsumeLastToken,
|
|
|
1244 /*ObjCGenericList=*/false) ||
|
|
|
1245 Invalid;
|
|
150
|
1246 }
|
|
|
1247
|
|
|
1248 /// Replace the tokens that form a simple-template-id with an
|
|
|
1249 /// annotation token containing the complete template-id.
|
|
|
1250 ///
|
|
|
1251 /// The first token in the stream must be the name of a template that
|
|
|
1252 /// is followed by a '<'. This routine will parse the complete
|
|
|
1253 /// simple-template-id and replace the tokens with a single annotation
|
|
|
1254 /// token with one of two different kinds: if the template-id names a
|
|
|
1255 /// type (and \p AllowTypeAnnotation is true), the annotation token is
|
|
|
1256 /// a type annotation that includes the optional nested-name-specifier
|
|
|
1257 /// (\p SS). Otherwise, the annotation token is a template-id
|
|
|
1258 /// annotation that does not include the optional
|
|
|
1259 /// nested-name-specifier.
|
|
|
1260 ///
|
|
|
1261 /// \param Template the declaration of the template named by the first
|
|
|
1262 /// token (an identifier), as returned from \c Action::isTemplateName().
|
|
|
1263 ///
|
|
|
1264 /// \param TNK the kind of template that \p Template
|
|
|
1265 /// refers to, as returned from \c Action::isTemplateName().
|
|
|
1266 ///
|
|
|
1267 /// \param SS if non-NULL, the nested-name-specifier that precedes
|
|
|
1268 /// this template name.
|
|
|
1269 ///
|
|
|
1270 /// \param TemplateKWLoc if valid, specifies that this template-id
|
|
|
1271 /// annotation was preceded by the 'template' keyword and gives the
|
|
|
1272 /// location of that keyword. If invalid (the default), then this
|
|
|
1273 /// template-id was not preceded by a 'template' keyword.
|
|
|
1274 ///
|
|
|
1275 /// \param AllowTypeAnnotation if true (the default), then a
|
|
|
1276 /// simple-template-id that refers to a class template, template
|
|
|
1277 /// template parameter, or other template that produces a type will be
|
|
|
1278 /// replaced with a type annotation token. Otherwise, the
|
|
|
1279 /// simple-template-id is always replaced with a template-id
|
|
|
1280 /// annotation token.
|
|
|
1281 ///
|
|
|
1282 /// \param TypeConstraint if true, then this is actually a type-constraint,
|
|
|
1283 /// meaning that the template argument list can be omitted (and the template in
|
|
|
1284 /// question must be a concept).
|
|
|
1285 ///
|
|
|
1286 /// If an unrecoverable parse error occurs and no annotation token can be
|
|
|
1287 /// formed, this function returns true.
|
|
|
1288 ///
|
|
|
1289 bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
|
|
|
1290 CXXScopeSpec &SS,
|
|
|
1291 SourceLocation TemplateKWLoc,
|
|
|
1292 UnqualifiedId &TemplateName,
|
|
|
1293 bool AllowTypeAnnotation,
|
|
|
1294 bool TypeConstraint) {
|
|
|
1295 assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++");
|
|
173
|
1296 assert((Tok.is(tok::less) || TypeConstraint) &&
|
|
150
|
1297 "Parser isn't at the beginning of a template-id");
|
|
|
1298 assert(!(TypeConstraint && AllowTypeAnnotation) && "type-constraint can't be "
|
|
|
1299 "a type annotation");
|
|
|
1300 assert((!TypeConstraint || TNK == TNK_Concept_template) && "type-constraint "
|
|
|
1301 "must accompany a concept name");
|
|
173
|
1302 assert((Template || TNK == TNK_Non_template) && "missing template name");
|
|
150
|
1303
|
|
|
1304 // Consume the template-name.
|
|
|
1305 SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
|
|
|
1306
|
|
|
1307 // Parse the enclosed template argument list.
|
|
|
1308 SourceLocation LAngleLoc, RAngleLoc;
|
|
|
1309 TemplateArgList TemplateArgs;
|
|
173
|
1310 bool ArgsInvalid = false;
|
|
150
|
1311 if (!TypeConstraint || Tok.is(tok::less)) {
|
|
173
|
1312 ArgsInvalid = ParseTemplateIdAfterTemplateName(false, LAngleLoc,
|
|
|
1313 TemplateArgs, RAngleLoc);
|
|
|
1314 // If we couldn't recover from invalid arguments, don't form an annotation
|
|
|
1315 // token -- we don't know how much to annotate.
|
|
|
1316 // FIXME: This can lead to duplicate diagnostics if we retry parsing this
|
|
|
1317 // template-id in another context. Try to annotate anyway?
|
|
|
1318 if (RAngleLoc.isInvalid())
|
|
150
|
1319 return true;
|
|
|
1320 }
|
|
|
1321
|
|
|
1322 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
|
|
|
1323
|
|
|
1324 // Build the annotation token.
|
|
|
1325 if (TNK == TNK_Type_template && AllowTypeAnnotation) {
|
|
173
|
1326 TypeResult Type = ArgsInvalid
|
|
|
1327 ? TypeError()
|
|
|
1328 : Actions.ActOnTemplateIdType(
|
|
|
1329 getCurScope(), SS, TemplateKWLoc, Template,
|
|
|
1330 TemplateName.Identifier, TemplateNameLoc,
|
|
|
1331 LAngleLoc, TemplateArgsPtr, RAngleLoc);
|
|
150
|
1332
|
|
|
1333 Tok.setKind(tok::annot_typename);
|
|
173
|
1334 setTypeAnnotation(Tok, Type);
|
|
150
|
1335 if (SS.isNotEmpty())
|
|
|
1336 Tok.setLocation(SS.getBeginLoc());
|
|
|
1337 else if (TemplateKWLoc.isValid())
|
|
|
1338 Tok.setLocation(TemplateKWLoc);
|
|
|
1339 else
|
|
|
1340 Tok.setLocation(TemplateNameLoc);
|
|
|
1341 } else {
|
|
|
1342 // Build a template-id annotation token that can be processed
|
|
|
1343 // later.
|
|
|
1344 Tok.setKind(tok::annot_template_id);
|
|
|
1345
|
|
|
1346 IdentifierInfo *TemplateII =
|
|
|
1347 TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
|
|
|
1348 ? TemplateName.Identifier
|
|
|
1349 : nullptr;
|
|
|
1350
|
|
|
1351 OverloadedOperatorKind OpKind =
|
|
|
1352 TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
|
|
|
1353 ? OO_None
|
|
|
1354 : TemplateName.OperatorFunctionId.Operator;
|
|
|
1355
|
|
|
1356 TemplateIdAnnotation *TemplateId = TemplateIdAnnotation::Create(
|
|
|
1357 TemplateKWLoc, TemplateNameLoc, TemplateII, OpKind, Template, TNK,
|
|
173
|
1358 LAngleLoc, RAngleLoc, TemplateArgs, ArgsInvalid, TemplateIds);
|
|
150
|
1359
|
|
|
1360 Tok.setAnnotationValue(TemplateId);
|
|
|
1361 if (TemplateKWLoc.isValid())
|
|
|
1362 Tok.setLocation(TemplateKWLoc);
|
|
|
1363 else
|
|
|
1364 Tok.setLocation(TemplateNameLoc);
|
|
|
1365 }
|
|
|
1366
|
|
|
1367 // Common fields for the annotation token
|
|
|
1368 Tok.setAnnotationEndLoc(RAngleLoc);
|
|
|
1369
|
|
|
1370 // In case the tokens were cached, have Preprocessor replace them with the
|
|
|
1371 // annotation token.
|
|
|
1372 PP.AnnotateCachedTokens(Tok);
|
|
|
1373 return false;
|
|
|
1374 }
|
|
|
1375
|
|
|
1376 /// Replaces a template-id annotation token with a type
|
|
|
1377 /// annotation token.
|
|
|
1378 ///
|
|
|
1379 /// If there was a failure when forming the type from the template-id,
|
|
|
1380 /// a type annotation token will still be created, but will have a
|
|
|
1381 /// NULL type pointer to signify an error.
|
|
|
1382 ///
|
|
|
1383 /// \param SS The scope specifier appearing before the template-id, if any.
|
|
|
1384 ///
|
|
|
1385 /// \param IsClassName Is this template-id appearing in a context where we
|
|
|
1386 /// know it names a class, such as in an elaborated-type-specifier or
|
|
|
1387 /// base-specifier? ('typename' and 'template' are unneeded and disallowed
|
|
|
1388 /// in those contexts.)
|
|
|
1389 void Parser::AnnotateTemplateIdTokenAsType(CXXScopeSpec &SS,
|
|
|
1390 bool IsClassName) {
|
|
|
1391 assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
|
|
|
1392
|
|
|
1393 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
|
|
173
|
1394 assert(TemplateId->mightBeType() &&
|
|
150
|
1395 "Only works for type and dependent templates");
|
|
|
1396
|
|
|
1397 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
|
|
|
1398 TemplateId->NumArgs);
|
|
|
1399
|
|
173
|
1400 TypeResult Type =
|
|
|
1401 TemplateId->isInvalid()
|
|
|
1402 ? TypeError()
|
|
|
1403 : Actions.ActOnTemplateIdType(
|
|
|
1404 getCurScope(), SS, TemplateId->TemplateKWLoc,
|
|
|
1405 TemplateId->Template, TemplateId->Name,
|
|
|
1406 TemplateId->TemplateNameLoc, TemplateId->LAngleLoc,
|
|
|
1407 TemplateArgsPtr, TemplateId->RAngleLoc,
|
|
|
1408 /*IsCtorOrDtorName*/ false, IsClassName);
|
|
150
|
1409 // Create the new "type" annotation token.
|
|
|
1410 Tok.setKind(tok::annot_typename);
|
|
173
|
1411 setTypeAnnotation(Tok, Type);
|
|
150
|
1412 if (SS.isNotEmpty()) // it was a C++ qualified type name.
|
|
|
1413 Tok.setLocation(SS.getBeginLoc());
|
|
|
1414 // End location stays the same
|
|
|
1415
|
|
|
1416 // Replace the template-id annotation token, and possible the scope-specifier
|
|
|
1417 // that precedes it, with the typename annotation token.
|
|
|
1418 PP.AnnotateCachedTokens(Tok);
|
|
|
1419 }
|
|
|
1420
|
|
|
1421 /// Determine whether the given token can end a template argument.
|
|
|
1422 static bool isEndOfTemplateArgument(Token Tok) {
|
|
173
|
1423 // FIXME: Handle '>>>'.
|
|
|
1424 return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater,
|
|
|
1425 tok::greatergreatergreater);
|
|
150
|
1426 }
|
|
|
1427
|
|
|
1428 /// Parse a C++ template template argument.
|
|
|
1429 ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
|
|
|
1430 if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
|
|
|
1431 !Tok.is(tok::annot_cxxscope))
|
|
|
1432 return ParsedTemplateArgument();
|
|
|
1433
|
|
|
1434 // C++0x [temp.arg.template]p1:
|
|
|
1435 // A template-argument for a template template-parameter shall be the name
|
|
|
1436 // of a class template or an alias template, expressed as id-expression.
|
|
|
1437 //
|
|
|
1438 // We parse an id-expression that refers to a class template or alias
|
|
|
1439 // template. The grammar we parse is:
|
|
|
1440 //
|
|
|
1441 // nested-name-specifier[opt] template[opt] identifier ...[opt]
|
|
|
1442 //
|
|
|
1443 // followed by a token that terminates a template argument, such as ',',
|
|
|
1444 // '>', or (in some cases) '>>'.
|
|
|
1445 CXXScopeSpec SS; // nested-name-specifier, if present
|
|
173
|
1446 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
|
|
|
1447 /*ObjectHadErrors=*/false,
|
|
150
|
1448 /*EnteringContext=*/false);
|
|
|
1449
|
|
|
1450 ParsedTemplateArgument Result;
|
|
|
1451 SourceLocation EllipsisLoc;
|
|
|
1452 if (SS.isSet() && Tok.is(tok::kw_template)) {
|
|
|
1453 // Parse the optional 'template' keyword following the
|
|
|
1454 // nested-name-specifier.
|
|
|
1455 SourceLocation TemplateKWLoc = ConsumeToken();
|
|
|
1456
|
|
|
1457 if (Tok.is(tok::identifier)) {
|
|
|
1458 // We appear to have a dependent template name.
|
|
|
1459 UnqualifiedId Name;
|
|
|
1460 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
|
|
|
1461 ConsumeToken(); // the identifier
|
|
|
1462
|
|
|
1463 TryConsumeToken(tok::ellipsis, EllipsisLoc);
|
|
|
1464
|
|
173
|
1465 // If the next token signals the end of a template argument, then we have
|
|
|
1466 // a (possibly-dependent) template name that could be a template template
|
|
|
1467 // argument.
|
|
150
|
1468 TemplateTy Template;
|
|
|
1469 if (isEndOfTemplateArgument(Tok) &&
|
|
173
|
1470 Actions.ActOnTemplateName(getCurScope(), SS, TemplateKWLoc, Name,
|
|
|
1471 /*ObjectType=*/nullptr,
|
|
|
1472 /*EnteringContext=*/false, Template))
|
|
150
|
1473 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
|
|
|
1474 }
|
|
|
1475 } else if (Tok.is(tok::identifier)) {
|
|
|
1476 // We may have a (non-dependent) template name.
|
|
|
1477 TemplateTy Template;
|
|
|
1478 UnqualifiedId Name;
|
|
|
1479 Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
|
|
|
1480 ConsumeToken(); // the identifier
|
|
|
1481
|
|
|
1482 TryConsumeToken(tok::ellipsis, EllipsisLoc);
|
|
|
1483
|
|
|
1484 if (isEndOfTemplateArgument(Tok)) {
|
|
|
1485 bool MemberOfUnknownSpecialization;
|
|
|
1486 TemplateNameKind TNK = Actions.isTemplateName(
|
|
|
1487 getCurScope(), SS,
|
|
|
1488 /*hasTemplateKeyword=*/false, Name,
|
|
|
1489 /*ObjectType=*/nullptr,
|
|
|
1490 /*EnteringContext=*/false, Template, MemberOfUnknownSpecialization);
|
|
|
1491 if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
|
|
|
1492 // We have an id-expression that refers to a class template or
|
|
|
1493 // (C++0x) alias template.
|
|
|
1494 Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
|
|
|
1495 }
|
|
|
1496 }
|
|
|
1497 }
|
|
|
1498
|
|
|
1499 // If this is a pack expansion, build it as such.
|
|
|
1500 if (EllipsisLoc.isValid() && !Result.isInvalid())
|
|
|
1501 Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
|
|
|
1502
|
|
|
1503 return Result;
|
|
|
1504 }
|
|
|
1505
|
|
|
1506 /// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
|
|
|
1507 ///
|
|
|
1508 /// template-argument: [C++ 14.2]
|
|
|
1509 /// constant-expression
|
|
|
1510 /// type-id
|
|
|
1511 /// id-expression
|
|
|
1512 ParsedTemplateArgument Parser::ParseTemplateArgument() {
|
|
|
1513 // C++ [temp.arg]p2:
|
|
|
1514 // In a template-argument, an ambiguity between a type-id and an
|
|
|
1515 // expression is resolved to a type-id, regardless of the form of
|
|
|
1516 // the corresponding template-parameter.
|
|
|
1517 //
|
|
|
1518 // Therefore, we initially try to parse a type-id - and isCXXTypeId might look
|
|
|
1519 // up and annotate an identifier as an id-expression during disambiguation,
|
|
|
1520 // so enter the appropriate context for a constant expression template
|
|
|
1521 // argument before trying to disambiguate.
|
|
|
1522
|
|
|
1523 EnterExpressionEvaluationContext EnterConstantEvaluated(
|
|
|
1524 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated,
|
|
|
1525 /*LambdaContextDecl=*/nullptr,
|
|
|
1526 /*ExprContext=*/Sema::ExpressionEvaluationContextRecord::EK_TemplateArgument);
|
|
|
1527 if (isCXXTypeId(TypeIdAsTemplateArgument)) {
|
|
|
1528 TypeResult TypeArg = ParseTypeName(
|
|
221
|
1529 /*Range=*/nullptr, DeclaratorContext::TemplateArg);
|
|
150
|
1530 return Actions.ActOnTemplateTypeArgument(TypeArg);
|
|
|
1531 }
|
|
|
1532
|
|
|
1533 // Try to parse a template template argument.
|
|
|
1534 {
|
|
|
1535 TentativeParsingAction TPA(*this);
|
|
|
1536
|
|
|
1537 ParsedTemplateArgument TemplateTemplateArgument
|
|
|
1538 = ParseTemplateTemplateArgument();
|
|
|
1539 if (!TemplateTemplateArgument.isInvalid()) {
|
|
|
1540 TPA.Commit();
|
|
|
1541 return TemplateTemplateArgument;
|
|
|
1542 }
|
|
|
1543
|
|
|
1544 // Revert this tentative parse to parse a non-type template argument.
|
|
|
1545 TPA.Revert();
|
|
|
1546 }
|
|
|
1547
|
|
|
1548 // Parse a non-type template argument.
|
|
|
1549 SourceLocation Loc = Tok.getLocation();
|
|
|
1550 ExprResult ExprArg = ParseConstantExpressionInExprEvalContext(MaybeTypeCast);
|
|
|
1551 if (ExprArg.isInvalid() || !ExprArg.get()) {
|
|
|
1552 return ParsedTemplateArgument();
|
|
|
1553 }
|
|
|
1554
|
|
|
1555 return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
|
|
|
1556 ExprArg.get(), Loc);
|
|
|
1557 }
|
|
|
1558
|
|
|
1559 /// ParseTemplateArgumentList - Parse a C++ template-argument-list
|
|
|
1560 /// (C++ [temp.names]). Returns true if there was an error.
|
|
|
1561 ///
|
|
|
1562 /// template-argument-list: [C++ 14.2]
|
|
|
1563 /// template-argument
|
|
|
1564 /// template-argument-list ',' template-argument
|
|
|
1565 bool
|
|
|
1566 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
|
|
|
1567
|
|
|
1568 ColonProtectionRAIIObject ColonProtection(*this, false);
|
|
|
1569
|
|
|
1570 do {
|
|
|
1571 ParsedTemplateArgument Arg = ParseTemplateArgument();
|
|
|
1572 SourceLocation EllipsisLoc;
|
|
|
1573 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
|
1574 Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
|
|
|
1575
|
|
173
|
1576 if (Arg.isInvalid())
|
|
150
|
1577 return true;
|
|
|
1578
|
|
|
1579 // Save this template argument.
|
|
|
1580 TemplateArgs.push_back(Arg);
|
|
|
1581
|
|
|
1582 // If the next token is a comma, consume it and keep reading
|
|
|
1583 // arguments.
|
|
|
1584 } while (TryConsumeToken(tok::comma));
|
|
|
1585
|
|
|
1586 return false;
|
|
|
1587 }
|
|
|
1588
|
|
|
1589 /// Parse a C++ explicit template instantiation
|
|
|
1590 /// (C++ [temp.explicit]).
|
|
|
1591 ///
|
|
|
1592 /// explicit-instantiation:
|
|
|
1593 /// 'extern' [opt] 'template' declaration
|
|
|
1594 ///
|
|
|
1595 /// Note that the 'extern' is a GNU extension and C++11 feature.
|
|
|
1596 Decl *Parser::ParseExplicitInstantiation(DeclaratorContext Context,
|
|
|
1597 SourceLocation ExternLoc,
|
|
|
1598 SourceLocation TemplateLoc,
|
|
|
1599 SourceLocation &DeclEnd,
|
|
|
1600 ParsedAttributes &AccessAttrs,
|
|
|
1601 AccessSpecifier AS) {
|
|
|
1602 // This isn't really required here.
|
|
|
1603 ParsingDeclRAIIObject
|
|
|
1604 ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
|
|
|
1605
|
|
|
1606 return ParseSingleDeclarationAfterTemplate(
|
|
|
1607 Context, ParsedTemplateInfo(ExternLoc, TemplateLoc),
|
|
|
1608 ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
|
|
|
1609 }
|
|
|
1610
|
|
|
1611 SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
|
|
|
1612 if (TemplateParams)
|
|
|
1613 return getTemplateParamsRange(TemplateParams->data(),
|
|
|
1614 TemplateParams->size());
|
|
|
1615
|
|
|
1616 SourceRange R(TemplateLoc);
|
|
|
1617 if (ExternLoc.isValid())
|
|
|
1618 R.setBegin(ExternLoc);
|
|
|
1619 return R;
|
|
|
1620 }
|
|
|
1621
|
|
|
1622 void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
|
|
|
1623 ((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
|
|
|
1624 }
|
|
|
1625
|
|
|
1626 /// Late parse a C++ function template in Microsoft mode.
|
|
|
1627 void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
|
|
|
1628 if (!LPT.D)
|
|
|
1629 return;
|
|
|
1630
|
|
173
|
1631 // Destroy TemplateIdAnnotations when we're done, if possible.
|
|
|
1632 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
|
|
|
1633
|
|
150
|
1634 // Get the FunctionDecl.
|
|
|
1635 FunctionDecl *FunD = LPT.D->getAsFunction();
|
|
|
1636 // Track template parameter depth.
|
|
|
1637 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
|
|
|
1638
|
|
|
1639 // To restore the context after late parsing.
|
|
|
1640 Sema::ContextRAII GlobalSavedContext(
|
|
|
1641 Actions, Actions.Context.getTranslationUnitDecl());
|
|
|
1642
|
|
221
|
1643 MultiParseScope Scopes(*this);
|
|
|
1644
|
|
|
1645 // Get the list of DeclContexts to reenter.
|
|
|
1646 SmallVector<DeclContext*, 4> DeclContextsToReenter;
|
|
|
1647 for (DeclContext *DC = FunD; DC && !DC->isTranslationUnit();
|
|
|
1648 DC = DC->getLexicalParent())
|
|
|
1649 DeclContextsToReenter.push_back(DC);
|
|
150
|
1650
|
|
221
|
1651 // Reenter scopes from outermost to innermost.
|
|
|
1652 for (DeclContext *DC : reverse(DeclContextsToReenter)) {
|
|
|
1653 CurTemplateDepthTracker.addDepth(
|
|
|
1654 ReenterTemplateScopes(Scopes, cast<Decl>(DC)));
|
|
|
1655 Scopes.Enter(Scope::DeclScope);
|
|
|
1656 // We'll reenter the function context itself below.
|
|
|
1657 if (DC != FunD)
|
|
|
1658 Actions.PushDeclContext(Actions.getCurScope(), DC);
|
|
150
|
1659 }
|
|
|
1660
|
|
|
1661 assert(!LPT.Toks.empty() && "Empty body!");
|
|
|
1662
|
|
|
1663 // Append the current token at the end of the new token stream so that it
|
|
|
1664 // doesn't get lost.
|
|
|
1665 LPT.Toks.push_back(Tok);
|
|
|
1666 PP.EnterTokenStream(LPT.Toks, true, /*IsReinject*/true);
|
|
|
1667
|
|
|
1668 // Consume the previously pushed token.
|
|
|
1669 ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
|
|
|
1670 assert(Tok.isOneOf(tok::l_brace, tok::colon, tok::kw_try) &&
|
|
|
1671 "Inline method not starting with '{', ':' or 'try'");
|
|
|
1672
|
|
|
1673 // Parse the method body. Function body parsing code is similar enough
|
|
|
1674 // to be re-used for method bodies as well.
|
|
|
1675 ParseScope FnScope(this, Scope::FnScope | Scope::DeclScope |
|
|
|
1676 Scope::CompoundStmtScope);
|
|
|
1677
|
|
|
1678 // Recreate the containing function DeclContext.
|
|
221
|
1679 Sema::ContextRAII FunctionSavedContext(Actions, FunD->getLexicalParent());
|
|
150
|
1680
|
|
|
1681 Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
|
|
|
1682
|
|
|
1683 if (Tok.is(tok::kw_try)) {
|
|
|
1684 ParseFunctionTryBlock(LPT.D, FnScope);
|
|
|
1685 } else {
|
|
|
1686 if (Tok.is(tok::colon))
|
|
|
1687 ParseConstructorInitializer(LPT.D);
|
|
|
1688 else
|
|
|
1689 Actions.ActOnDefaultCtorInitializers(LPT.D);
|
|
|
1690
|
|
|
1691 if (Tok.is(tok::l_brace)) {
|
|
|
1692 assert((!isa<FunctionTemplateDecl>(LPT.D) ||
|
|
|
1693 cast<FunctionTemplateDecl>(LPT.D)
|
|
|
1694 ->getTemplateParameters()
|
|
|
1695 ->getDepth() == TemplateParameterDepth - 1) &&
|
|
|
1696 "TemplateParameterDepth should be greater than the depth of "
|
|
|
1697 "current template being instantiated!");
|
|
|
1698 ParseFunctionStatementBody(LPT.D, FnScope);
|
|
|
1699 Actions.UnmarkAsLateParsedTemplate(FunD);
|
|
|
1700 } else
|
|
|
1701 Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
|
|
|
1702 }
|
|
|
1703 }
|
|
|
1704
|
|
|
1705 /// Lex a delayed template function for late parsing.
|
|
|
1706 void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
|
|
|
1707 tok::TokenKind kind = Tok.getKind();
|
|
|
1708 if (!ConsumeAndStoreFunctionPrologue(Toks)) {
|
|
|
1709 // Consume everything up to (and including) the matching right brace.
|
|
|
1710 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
|
|
|
1711 }
|
|
|
1712
|
|
|
1713 // If we're in a function-try-block, we need to store all the catch blocks.
|
|
|
1714 if (kind == tok::kw_try) {
|
|
|
1715 while (Tok.is(tok::kw_catch)) {
|
|
|
1716 ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
|
|
|
1717 ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
|
|
|
1718 }
|
|
|
1719 }
|
|
|
1720 }
|
|
|
1721
|
|
|
1722 /// We've parsed something that could plausibly be intended to be a template
|
|
|
1723 /// name (\p LHS) followed by a '<' token, and the following code can't possibly
|
|
|
1724 /// be an expression. Determine if this is likely to be a template-id and if so,
|
|
|
1725 /// diagnose it.
|
|
|
1726 bool Parser::diagnoseUnknownTemplateId(ExprResult LHS, SourceLocation Less) {
|
|
|
1727 TentativeParsingAction TPA(*this);
|
|
|
1728 // FIXME: We could look at the token sequence in a lot more detail here.
|
|
|
1729 if (SkipUntil(tok::greater, tok::greatergreater, tok::greatergreatergreater,
|
|
|
1730 StopAtSemi | StopBeforeMatch)) {
|
|
|
1731 TPA.Commit();
|
|
|
1732
|
|
|
1733 SourceLocation Greater;
|
|
173
|
1734 ParseGreaterThanInTemplateList(Less, Greater, true, false);
|
|
150
|
1735 Actions.diagnoseExprIntendedAsTemplateName(getCurScope(), LHS,
|
|
|
1736 Less, Greater);
|
|
|
1737 return true;
|
|
|
1738 }
|
|
|
1739
|
|
|
1740 // There's no matching '>' token, this probably isn't supposed to be
|
|
|
1741 // interpreted as a template-id. Parse it as an (ill-formed) comparison.
|
|
|
1742 TPA.Revert();
|
|
|
1743 return false;
|
|
|
1744 }
|
|
|
1745
|
|
|
1746 void Parser::checkPotentialAngleBracket(ExprResult &PotentialTemplateName) {
|
|
|
1747 assert(Tok.is(tok::less) && "not at a potential angle bracket");
|
|
|
1748
|
|
|
1749 bool DependentTemplateName = false;
|
|
|
1750 if (!Actions.mightBeIntendedToBeTemplateName(PotentialTemplateName,
|
|
|
1751 DependentTemplateName))
|
|
|
1752 return;
|
|
|
1753
|
|
|
1754 // OK, this might be a name that the user intended to be parsed as a
|
|
|
1755 // template-name, followed by a '<' token. Check for some easy cases.
|
|
|
1756
|
|
|
1757 // If we have potential_template<>, then it's supposed to be a template-name.
|
|
|
1758 if (NextToken().is(tok::greater) ||
|
|
|
1759 (getLangOpts().CPlusPlus11 &&
|
|
|
1760 NextToken().isOneOf(tok::greatergreater, tok::greatergreatergreater))) {
|
|
|
1761 SourceLocation Less = ConsumeToken();
|
|
|
1762 SourceLocation Greater;
|
|
173
|
1763 ParseGreaterThanInTemplateList(Less, Greater, true, false);
|
|
150
|
1764 Actions.diagnoseExprIntendedAsTemplateName(
|
|
|
1765 getCurScope(), PotentialTemplateName, Less, Greater);
|
|
|
1766 // FIXME: Perform error recovery.
|
|
|
1767 PotentialTemplateName = ExprError();
|
|
|
1768 return;
|
|
|
1769 }
|
|
|
1770
|
|
|
1771 // If we have 'potential_template<type-id', assume it's supposed to be a
|
|
|
1772 // template-name if there's a matching '>' later on.
|
|
|
1773 {
|
|
|
1774 // FIXME: Avoid the tentative parse when NextToken() can't begin a type.
|
|
|
1775 TentativeParsingAction TPA(*this);
|
|
|
1776 SourceLocation Less = ConsumeToken();
|
|
|
1777 if (isTypeIdUnambiguously() &&
|
|
|
1778 diagnoseUnknownTemplateId(PotentialTemplateName, Less)) {
|
|
|
1779 TPA.Commit();
|
|
|
1780 // FIXME: Perform error recovery.
|
|
|
1781 PotentialTemplateName = ExprError();
|
|
|
1782 return;
|
|
|
1783 }
|
|
|
1784 TPA.Revert();
|
|
|
1785 }
|
|
|
1786
|
|
|
1787 // Otherwise, remember that we saw this in case we see a potentially-matching
|
|
|
1788 // '>' token later on.
|
|
|
1789 AngleBracketTracker::Priority Priority =
|
|
|
1790 (DependentTemplateName ? AngleBracketTracker::DependentName
|
|
|
1791 : AngleBracketTracker::PotentialTypo) |
|
|
|
1792 (Tok.hasLeadingSpace() ? AngleBracketTracker::SpaceBeforeLess
|
|
|
1793 : AngleBracketTracker::NoSpaceBeforeLess);
|
|
|
1794 AngleBrackets.add(*this, PotentialTemplateName.get(), Tok.getLocation(),
|
|
|
1795 Priority);
|
|
|
1796 }
|
|
|
1797
|
|
|
1798 bool Parser::checkPotentialAngleBracketDelimiter(
|
|
|
1799 const AngleBracketTracker::Loc &LAngle, const Token &OpToken) {
|
|
|
1800 // If a comma in an expression context is followed by a type that can be a
|
|
|
1801 // template argument and cannot be an expression, then this is ill-formed,
|
|
|
1802 // but might be intended to be part of a template-id.
|
|
|
1803 if (OpToken.is(tok::comma) && isTypeIdUnambiguously() &&
|
|
|
1804 diagnoseUnknownTemplateId(LAngle.TemplateName, LAngle.LessLoc)) {
|
|
|
1805 AngleBrackets.clear(*this);
|
|
|
1806 return true;
|
|
|
1807 }
|
|
|
1808
|
|
|
1809 // If a context that looks like a template-id is followed by '()', then
|
|
|
1810 // this is ill-formed, but might be intended to be a template-id
|
|
|
1811 // followed by '()'.
|
|
|
1812 if (OpToken.is(tok::greater) && Tok.is(tok::l_paren) &&
|
|
|
1813 NextToken().is(tok::r_paren)) {
|
|
|
1814 Actions.diagnoseExprIntendedAsTemplateName(
|
|
|
1815 getCurScope(), LAngle.TemplateName, LAngle.LessLoc,
|
|
|
1816 OpToken.getLocation());
|
|
|
1817 AngleBrackets.clear(*this);
|
|
|
1818 return true;
|
|
|
1819 }
|
|
|
1820
|
|
|
1821 // After a '>' (etc), we're no longer potentially in a construct that's
|
|
|
1822 // intended to be treated as a template-id.
|
|
|
1823 if (OpToken.is(tok::greater) ||
|
|
|
1824 (getLangOpts().CPlusPlus11 &&
|
|
|
1825 OpToken.isOneOf(tok::greatergreater, tok::greatergreatergreater)))
|
|
|
1826 AngleBrackets.clear(*this);
|
|
|
1827 return false;
|
|
|
1828 }
|
