1 //===--- ParsedTemplate.h - Template Parsing Data Types ---------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides data structures that store the parsed representation of
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CLANG_SEMA_PARSEDTEMPLATE_H
16 #define LLVM_CLANG_SEMA_PARSEDTEMPLATE_H
18 #include "clang/Basic/OperatorKinds.h"
19 #include "clang/Basic/SourceLocation.h"
20 #include "clang/Basic/TemplateKinds.h"
21 #include "clang/Sema/DeclSpec.h"
22 #include "clang/Sema/Ownership.h"
23 #include "llvm/ADT/SmallVector.h"
29 /// Represents the parsed form of a C++ template argument.
30 class ParsedTemplateArgument {
32 /// Describes the kind of template argument that was parsed.
34 /// A template type parameter, stored as a type.
36 /// A non-type template parameter, stored as an expression.
38 /// A template template argument, stored as a template name.
42 /// Build an empty template argument.
44 /// This template argument is invalid.
45 ParsedTemplateArgument() : Kind(Type), Arg(nullptr) { }
47 /// Create a template type argument or non-type template argument.
49 /// \param Arg the template type argument or non-type template argument.
50 /// \param Loc the location of the type.
51 ParsedTemplateArgument(KindType Kind, void *Arg, SourceLocation Loc)
52 : Kind(Kind), Arg(Arg), Loc(Loc) { }
54 /// Create a template template argument.
56 /// \param SS the C++ scope specifier that precedes the template name, if
59 /// \param Template the template to which this template template
62 /// \param TemplateLoc the location of the template name.
63 ParsedTemplateArgument(const CXXScopeSpec &SS,
64 ParsedTemplateTy Template,
65 SourceLocation TemplateLoc)
66 : Kind(ParsedTemplateArgument::Template),
67 Arg(Template.getAsOpaquePtr()),
68 SS(SS), Loc(TemplateLoc), EllipsisLoc() { }
70 /// Determine whether the given template argument is invalid.
71 bool isInvalid() const { return Arg == nullptr; }
73 /// Determine what kind of template argument we have.
74 KindType getKind() const { return Kind; }
76 /// Retrieve the template type argument's type.
77 ParsedType getAsType() const {
78 assert(Kind == Type && "Not a template type argument");
79 return ParsedType::getFromOpaquePtr(Arg);
82 /// Retrieve the non-type template argument's expression.
83 Expr *getAsExpr() const {
84 assert(Kind == NonType && "Not a non-type template argument");
85 return static_cast<Expr*>(Arg);
88 /// Retrieve the template template argument's template name.
89 ParsedTemplateTy getAsTemplate() const {
90 assert(Kind == Template && "Not a template template argument");
91 return ParsedTemplateTy::getFromOpaquePtr(Arg);
94 /// Retrieve the location of the template argument.
95 SourceLocation getLocation() const { return Loc; }
97 /// Retrieve the nested-name-specifier that precedes the template
98 /// name in a template template argument.
99 const CXXScopeSpec &getScopeSpec() const {
100 assert(Kind == Template &&
101 "Only template template arguments can have a scope specifier");
105 /// Retrieve the location of the ellipsis that makes a template
106 /// template argument into a pack expansion.
107 SourceLocation getEllipsisLoc() const {
108 assert(Kind == Template &&
109 "Only template template arguments can have an ellipsis");
113 /// Retrieve a pack expansion of the given template template
116 /// \param EllipsisLoc The location of the ellipsis.
117 ParsedTemplateArgument getTemplatePackExpansion(
118 SourceLocation EllipsisLoc) const;
123 /// The actual template argument representation, which may be
124 /// an \c Sema::TypeTy* (for a type), an Expr* (for an
125 /// expression), or an Sema::TemplateTy (for a template).
128 /// The nested-name-specifier that can accompany a template template
132 /// the location of the template argument.
135 /// The ellipsis location that can accompany a template template
136 /// argument (turning it into a template template argument expansion).
137 SourceLocation EllipsisLoc;
140 /// Information about a template-id annotation
143 /// A template-id annotation token contains the template declaration,
144 /// template arguments, whether those template arguments were types,
145 /// expressions, or template names, and the source locations for important
146 /// tokens. All of the information about template arguments is allocated
147 /// directly after this structure.
148 struct TemplateIdAnnotation final
149 : private llvm::TrailingObjects<TemplateIdAnnotation,
150 ParsedTemplateArgument> {
151 friend TrailingObjects;
152 /// The nested-name-specifier that precedes the template name.
155 /// TemplateKWLoc - The location of the template keyword.
156 /// For e.g. typename T::template Y<U>
157 SourceLocation TemplateKWLoc;
159 /// TemplateNameLoc - The location of the template name within the
161 SourceLocation TemplateNameLoc;
163 /// FIXME: Temporarily stores the name of a specialization
164 IdentifierInfo *Name;
166 /// FIXME: Temporarily stores the overloaded operator kind.
167 OverloadedOperatorKind Operator;
169 /// The declaration of the template corresponding to the
171 ParsedTemplateTy Template;
173 /// The kind of template that Template refers to.
174 TemplateNameKind Kind;
176 /// The location of the '<' before the template argument
178 SourceLocation LAngleLoc;
180 /// The location of the '>' after the template argument
182 SourceLocation RAngleLoc;
184 /// NumArgs - The number of template arguments.
187 /// Retrieves a pointer to the template arguments
188 ParsedTemplateArgument *getTemplateArgs() {
189 return getTrailingObjects<ParsedTemplateArgument>();
192 /// Creates a new TemplateIdAnnotation with NumArgs arguments and
193 /// appends it to List.
194 static TemplateIdAnnotation *
195 Create(CXXScopeSpec SS, SourceLocation TemplateKWLoc,
196 SourceLocation TemplateNameLoc, IdentifierInfo *Name,
197 OverloadedOperatorKind OperatorKind,
198 ParsedTemplateTy OpaqueTemplateName, TemplateNameKind TemplateKind,
199 SourceLocation LAngleLoc, SourceLocation RAngleLoc,
200 ArrayRef<ParsedTemplateArgument> TemplateArgs,
201 SmallVectorImpl<TemplateIdAnnotation *> &CleanupList) {
202 TemplateIdAnnotation *TemplateId = new (llvm::safe_malloc(
203 totalSizeToAlloc<ParsedTemplateArgument>(TemplateArgs.size())))
204 TemplateIdAnnotation(SS, TemplateKWLoc, TemplateNameLoc, Name,
205 OperatorKind, OpaqueTemplateName, TemplateKind,
206 LAngleLoc, RAngleLoc, TemplateArgs);
207 CleanupList.push_back(TemplateId);
213 getTemplateArgs(), getTemplateArgs() + NumArgs,
214 [](ParsedTemplateArgument &A) { A.~ParsedTemplateArgument(); });
215 this->~TemplateIdAnnotation();
219 TemplateIdAnnotation(const TemplateIdAnnotation &) = delete;
221 TemplateIdAnnotation(CXXScopeSpec SS, SourceLocation TemplateKWLoc,
222 SourceLocation TemplateNameLoc, IdentifierInfo *Name,
223 OverloadedOperatorKind OperatorKind,
224 ParsedTemplateTy OpaqueTemplateName,
225 TemplateNameKind TemplateKind,
226 SourceLocation LAngleLoc, SourceLocation RAngleLoc,
227 ArrayRef<ParsedTemplateArgument> TemplateArgs) noexcept
228 : SS(SS), TemplateKWLoc(TemplateKWLoc),
229 TemplateNameLoc(TemplateNameLoc), Name(Name), Operator(OperatorKind),
230 Template(OpaqueTemplateName), Kind(TemplateKind),
231 LAngleLoc(LAngleLoc), RAngleLoc(RAngleLoc),
232 NumArgs(TemplateArgs.size()) {
234 std::uninitialized_copy(TemplateArgs.begin(), TemplateArgs.end(),
237 ~TemplateIdAnnotation() = default;
240 /// Retrieves the range of the given template parameter lists.
241 SourceRange getTemplateParamsRange(TemplateParameterList const *const *Params,
243 } // end namespace clang
245 #endif // LLVM_CLANG_SEMA_PARSEDTEMPLATE_H