clang 19.0.0git
CXXFieldCollector.h
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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
20namespace clang {
21 class FieldDecl;
22
23/// CXXFieldCollector - Used to keep track of CXXFieldDecls during parsing of
24/// C++ classes.
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.
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
50public:
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
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified.
CXXFieldCollector - Used to keep track of CXXFieldDecls during parsing of C++ classes.
FieldDecl ** getCurFields()
getCurFields - Pointer to array of fields added to the currently parsed class.
void Add(FieldDecl *D)
Add - Called by Sema::ActOnCXXMemberDeclarator.
size_t getCurNumFields() const
getCurNumField - The number of fields added to the currently parsed class.
void StartClass()
StartClass - Called by Sema::ActOnStartCXXClassDef.
void FinishClass()
FinishClass - Called by Sema::ActOnFinishCXXClassDef.
Represents a member of a struct/union/class.
Definition: Decl.h:3059
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