1 //===--- ParsedTemplate.h - Template Parsing Data Types ---------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file provides data structures that store the parsed representation of
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_SEMA_PARSEDTEMPLATE_H
15 #define LLVM_CLANG_SEMA_PARSEDTEMPLATE_H
17 #include "clang/Basic/OperatorKinds.h"
18 #include "clang/Basic/SourceLocation.h"
19 #include "clang/Basic/TemplateKinds.h"
20 #include "clang/Sema/DeclSpec.h"
21 #include "clang/Sema/Ownership.h"
22 #include "llvm/ADT/SmallVector.h"
28 /// Represents the parsed form of a C++ template argument.
29 class ParsedTemplateArgument {
31 /// Describes the kind of template argument that was parsed.
33 /// A template type parameter, stored as a type.
35 /// A non-type template parameter, stored as an expression.
37 /// A template template argument, stored as a template name.
41 /// Build an empty template argument.
43 /// This template argument is invalid.
44 ParsedTemplateArgument() : Kind(Type), Arg(nullptr) { }
46 /// Create a template type argument or non-type template argument.
48 /// \param Arg the template type argument or non-type template argument.
49 /// \param Loc the location of the type.
50 ParsedTemplateArgument(KindType Kind, void *Arg, SourceLocation Loc)
51 : Kind(Kind), Arg(Arg), Loc(Loc) { }
53 /// Create a template template argument.
55 /// \param SS the C++ scope specifier that precedes the template name, if
58 /// \param Template the template to which this template template
61 /// \param TemplateLoc the location of the template name.
62 ParsedTemplateArgument(const CXXScopeSpec &SS,
63 ParsedTemplateTy Template,
64 SourceLocation TemplateLoc)
65 : Kind(ParsedTemplateArgument::Template),
66 Arg(Template.getAsOpaquePtr()),
67 SS(SS), Loc(TemplateLoc), EllipsisLoc() { }
69 /// Determine whether the given template argument is invalid.
70 bool isInvalid() const { return Arg == nullptr; }
72 /// Determine what kind of template argument we have.
73 KindType getKind() const { return Kind; }
75 /// Retrieve the template type argument's type.
76 ParsedType getAsType() const {
77 assert(Kind == Type && "Not a template type argument");
78 return ParsedType::getFromOpaquePtr(Arg);
81 /// Retrieve the non-type template argument's expression.
82 Expr *getAsExpr() const {
83 assert(Kind == NonType && "Not a non-type template argument");
84 return static_cast<Expr*>(Arg);
87 /// Retrieve the template template argument's template name.
88 ParsedTemplateTy getAsTemplate() const {
89 assert(Kind == Template && "Not a template template argument");
90 return ParsedTemplateTy::getFromOpaquePtr(Arg);
93 /// Retrieve the location of the template argument.
94 SourceLocation getLocation() const { return Loc; }
96 /// Retrieve the nested-name-specifier that precedes the template
97 /// name in a template template argument.
98 const CXXScopeSpec &getScopeSpec() const {
99 assert(Kind == Template &&
100 "Only template template arguments can have a scope specifier");
104 /// Retrieve the location of the ellipsis that makes a template
105 /// template argument into a pack expansion.
106 SourceLocation getEllipsisLoc() const {
107 assert(Kind == Template &&
108 "Only template template arguments can have an ellipsis");
112 /// Retrieve a pack expansion of the given template template
115 /// \param EllipsisLoc The location of the ellipsis.
116 ParsedTemplateArgument getTemplatePackExpansion(
117 SourceLocation EllipsisLoc) const;
122 /// The actual template argument representation, which may be
123 /// an \c Sema::TypeTy* (for a type), an Expr* (for an
124 /// expression), or an Sema::TemplateTy (for a template).
127 /// The nested-name-specifier that can accompany a template template
131 /// the location of the template argument.
134 /// The ellipsis location that can accompany a template template
135 /// argument (turning it into a template template argument expansion).
136 SourceLocation EllipsisLoc;
139 /// Information about a template-id annotation
142 /// A template-id annotation token contains the template declaration,
143 /// template arguments, whether those template arguments were types,
144 /// expressions, or template names, and the source locations for important
145 /// tokens. All of the information about template arguments is allocated
146 /// directly after this structure.
147 struct TemplateIdAnnotation final
148 : private llvm::TrailingObjects<TemplateIdAnnotation,
149 ParsedTemplateArgument> {
150 friend TrailingObjects;
151 /// The nested-name-specifier that precedes the template name.
154 /// TemplateKWLoc - The location of the template keyword.
155 /// For e.g. typename T::template Y<U>
156 SourceLocation TemplateKWLoc;
158 /// TemplateNameLoc - The location of the template name within the
160 SourceLocation TemplateNameLoc;
162 /// FIXME: Temporarily stores the name of a specialization
163 IdentifierInfo *Name;
165 /// FIXME: Temporarily stores the overloaded operator kind.
166 OverloadedOperatorKind Operator;
168 /// The declaration of the template corresponding to the
170 ParsedTemplateTy Template;
172 /// The kind of template that Template refers to.
173 TemplateNameKind Kind;
175 /// The location of the '<' before the template argument
177 SourceLocation LAngleLoc;
179 /// The location of the '>' after the template argument
181 SourceLocation RAngleLoc;
183 /// NumArgs - The number of template arguments.
186 /// Retrieves a pointer to the template arguments
187 ParsedTemplateArgument *getTemplateArgs() {
188 return getTrailingObjects<ParsedTemplateArgument>();
191 /// Creates a new TemplateIdAnnotation with NumArgs arguments and
192 /// appends it to List.
193 static TemplateIdAnnotation *
194 Create(CXXScopeSpec SS, SourceLocation TemplateKWLoc,
195 SourceLocation TemplateNameLoc, IdentifierInfo *Name,
196 OverloadedOperatorKind OperatorKind,
197 ParsedTemplateTy OpaqueTemplateName, TemplateNameKind TemplateKind,
198 SourceLocation LAngleLoc, SourceLocation RAngleLoc,
199 ArrayRef<ParsedTemplateArgument> TemplateArgs,
200 SmallVectorImpl<TemplateIdAnnotation *> &CleanupList) {
201 TemplateIdAnnotation *TemplateId = new (llvm::safe_malloc(
202 totalSizeToAlloc<ParsedTemplateArgument>(TemplateArgs.size())))
203 TemplateIdAnnotation(SS, TemplateKWLoc, TemplateNameLoc, Name,
204 OperatorKind, OpaqueTemplateName, TemplateKind,
205 LAngleLoc, RAngleLoc, TemplateArgs);
206 CleanupList.push_back(TemplateId);
212 getTemplateArgs(), getTemplateArgs() + NumArgs,
213 [](ParsedTemplateArgument &A) { A.~ParsedTemplateArgument(); });
214 this->~TemplateIdAnnotation();
218 TemplateIdAnnotation(const TemplateIdAnnotation &) = delete;
220 TemplateIdAnnotation(CXXScopeSpec SS, SourceLocation TemplateKWLoc,
221 SourceLocation TemplateNameLoc, IdentifierInfo *Name,
222 OverloadedOperatorKind OperatorKind,
223 ParsedTemplateTy OpaqueTemplateName,
224 TemplateNameKind TemplateKind,
225 SourceLocation LAngleLoc, SourceLocation RAngleLoc,
226 ArrayRef<ParsedTemplateArgument> TemplateArgs) noexcept
227 : SS(SS), TemplateKWLoc(TemplateKWLoc),
228 TemplateNameLoc(TemplateNameLoc), Name(Name), Operator(OperatorKind),
229 Template(OpaqueTemplateName), Kind(TemplateKind),
230 LAngleLoc(LAngleLoc), RAngleLoc(RAngleLoc),
231 NumArgs(TemplateArgs.size()) {
233 std::uninitialized_copy(TemplateArgs.begin(), TemplateArgs.end(),
236 ~TemplateIdAnnotation() = default;
239 /// Retrieves the range of the given template parameter lists.
240 SourceRange getTemplateParamsRange(TemplateParameterList const *const *Params,
242 } // end namespace clang
244 #endif // LLVM_CLANG_SEMA_PARSEDTEMPLATE_H