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