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      1 //=== SelectorExtras.h - Helpers for checkers using selectors -----*- C++ -*-=//
      2 //
      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
      6 //
      7 //===----------------------------------------------------------------------===//
      8 
      9 #ifndef LLVM_CLANG_LIB_ANALYSIS_SELECTOREXTRAS_H
     10 #define LLVM_CLANG_LIB_ANALYSIS_SELECTOREXTRAS_H
     11 
     12 #include "clang/AST/ASTContext.h"
     13 
     14 namespace clang {
     15 
     16 template <typename... IdentifierInfos>
     17 static inline Selector getKeywordSelector(ASTContext &Ctx,
     18                                           IdentifierInfos *... IIs) {
     19   static_assert(sizeof...(IdentifierInfos),
     20                 "keyword selectors must have at least one argument");
     21   SmallVector<IdentifierInfo *, 10> II({&Ctx.Idents.get(IIs)...});
     22 
     23   return Ctx.Selectors.getSelector(II.size(), &II[0]);
     24 }
     25 
     26 template <typename... IdentifierInfos>
     27 static inline void lazyInitKeywordSelector(Selector &Sel, ASTContext &Ctx,
     28                                            IdentifierInfos *... IIs) {
     29   if (!Sel.isNull())
     30     return;
     31   Sel = getKeywordSelector(Ctx, IIs...);
     32 }
     33 
     34 } // end namespace clang
     35 
     36 #endif
     37