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  1. //===- CXXFieldCollector.h - Utility class for C++ class semantic analysis ===//
  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. //  This file provides CXXFieldCollector that is used during parsing & semantic
  10. //  analysis of C++ classes.
  11. //
  12. //===----------------------------------------------------------------------===//
  13.  
  14. #ifndef LLVM_CLANG_SEMA_CXXFIELDCOLLECTOR_H
  15. #define LLVM_CLANG_SEMA_CXXFIELDCOLLECTOR_H
  16.  
  17. #include "clang/Basic/LLVM.h"
  18. #include "llvm/ADT/SmallVector.h"
  19.  
  20. namespace clang {
  21.   class FieldDecl;
  22.  
  23. /// CXXFieldCollector - Used to keep track of CXXFieldDecls during parsing of
  24. /// C++ classes.
  25. class CXXFieldCollector {
  26.   /// Fields - Contains all FieldDecls collected during parsing of a C++
  27.   /// class. When a nested class is entered, its fields are appended to the
  28.   /// fields of its parent class, when it is exited its fields are removed.
  29.   SmallVector<FieldDecl*, 32> Fields;
  30.  
  31.   /// FieldCount - Each entry represents the number of fields collected during
  32.   /// the parsing of a C++ class. When a nested class is entered, a new field
  33.   /// count is pushed, when it is exited, the field count is popped.
  34.   SmallVector<size_t, 4> FieldCount;
  35.  
  36.   // Example:
  37.   //
  38.   // class C {
  39.   //   int x,y;
  40.   //   class NC {
  41.   //     int q;
  42.   //     // At this point, Fields contains [x,y,q] decls and FieldCount contains
  43.   //     // [2,1].
  44.   //   };
  45.   //   int z;
  46.   //   // At this point, Fields contains [x,y,z] decls and FieldCount contains
  47.   //   // [3].
  48.   // };
  49.  
  50. public:
  51.   /// StartClass - Called by Sema::ActOnStartCXXClassDef.
  52.   void StartClass() { FieldCount.push_back(0); }
  53.  
  54.   /// Add - Called by Sema::ActOnCXXMemberDeclarator.
  55.   void Add(FieldDecl *D) {
  56.     Fields.push_back(D);
  57.     ++FieldCount.back();
  58.   }
  59.  
  60.   /// getCurNumField - The number of fields added to the currently parsed class.
  61.   size_t getCurNumFields() const {
  62.     assert(!FieldCount.empty() && "no currently-parsed class");
  63.     return FieldCount.back();
  64.   }
  65.  
  66.   /// getCurFields - Pointer to array of fields added to the currently parsed
  67.   /// class.
  68.   FieldDecl **getCurFields() { return &*(Fields.end() - getCurNumFields()); }
  69.  
  70.   /// FinishClass - Called by Sema::ActOnFinishCXXClassDef.
  71.   void FinishClass() {
  72.     Fields.resize(Fields.size() - getCurNumFields());
  73.     FieldCount.pop_back();
  74.   }
  75. };
  76.  
  77. } // end namespace clang
  78.  
  79. #endif
  80.