clang  6.0.0svn
CXXFieldCollector.h
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1 //===- CXXFieldCollector.h - Utility class for C++ class semantic analysis ===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file provides CXXFieldCollector that is used during parsing & semantic
11 // analysis of C++ classes.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_CLANG_SEMA_CXXFIELDCOLLECTOR_H
16 #define LLVM_CLANG_SEMA_CXXFIELDCOLLECTOR_H
17 
18 #include "clang/Basic/LLVM.h"
19 #include "llvm/ADT/SmallVector.h"
20 
21 namespace clang {
22  class FieldDecl;
23 
24 /// CXXFieldCollector - Used to keep track of CXXFieldDecls during parsing of
25 /// C++ classes.
27  /// Fields - Contains all FieldDecls collected during parsing of a C++
28  /// class. When a nested class is entered, its fields are appended to the
29  /// fields of its parent class, when it is exited its fields are removed.
31 
32  /// FieldCount - Each entry represents the number of fields collected during
33  /// the parsing of a C++ class. When a nested class is entered, a new field
34  /// count is pushed, when it is exited, the field count is popped.
35  SmallVector<size_t, 4> FieldCount;
36 
37  // Example:
38  //
39  // class C {
40  // int x,y;
41  // class NC {
42  // int q;
43  // // At this point, Fields contains [x,y,q] decls and FieldCount contains
44  // // [2,1].
45  // };
46  // int z;
47  // // At this point, Fields contains [x,y,z] decls and FieldCount contains
48  // // [3].
49  // };
50 
51 public:
52  /// StartClass - Called by Sema::ActOnStartCXXClassDef.
53  void StartClass() { FieldCount.push_back(0); }
54 
55  /// Add - Called by Sema::ActOnCXXMemberDeclarator.
56  void Add(FieldDecl *D) {
57  Fields.push_back(D);
58  ++FieldCount.back();
59  }
60 
61  /// getCurNumField - The number of fields added to the currently parsed class.
62  size_t getCurNumFields() const {
63  assert(!FieldCount.empty() && "no currently-parsed class");
64  return FieldCount.back();
65  }
66 
67  /// getCurFields - Pointer to array of fields added to the currently parsed
68  /// class.
69  FieldDecl **getCurFields() { return &*(Fields.end() - getCurNumFields()); }
70 
71  /// FinishClass - Called by Sema::ActOnFinishCXXClassDef.
72  void FinishClass() {
73  Fields.resize(Fields.size() - getCurNumFields());
74  FieldCount.pop_back();
75  }
76 };
77 
78 } // end namespace clang
79 
80 #endif
void FinishClass()
FinishClass - Called by Sema::ActOnFinishCXXClassDef.
CXXFieldCollector - Used to keep track of CXXFieldDecls during parsing of C++ classes.
size_t getCurNumFields() const
getCurNumField - The number of fields added to the currently parsed class.
void StartClass()
StartClass - Called by Sema::ActOnStartCXXClassDef.
FieldDecl - An instance of this class is created by Sema::ActOnField to represent a member of a struc...
Definition: Decl.h:2457
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified...
void Add(FieldDecl *D)
Add - Called by Sema::ActOnCXXMemberDeclarator.
Dataflow Directional Tag Classes.
FieldDecl ** getCurFields()
getCurFields - Pointer to array of fields added to the currently parsed class.