1 //===- StmtIterator.h - Iterators for Statements ----------------*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
9 // This file defines the StmtIterator and ConstStmtIterator classes.
11 //===----------------------------------------------------------------------===//
13 #ifndef LLVM_CLANG_AST_STMTITERATOR_H
14 #define LLVM_CLANG_AST_STMTITERATOR_H
25 class VariableArrayType;
27 class StmtIteratorBase {
31 SizeOfTypeVAMode = 0x1,
40 uintptr_t RawVAPtr = 0;
43 StmtIteratorBase(Stmt **s) : stmt(s) {}
44 StmtIteratorBase(const VariableArrayType *t);
45 StmtIteratorBase(Decl **dgi, Decl **dge);
46 StmtIteratorBase() : stmt(nullptr) {}
48 bool inDeclGroup() const {
49 return (RawVAPtr & Flags) == DeclGroupMode;
52 bool inSizeOfTypeVA() const {
53 return (RawVAPtr & Flags) == SizeOfTypeVAMode;
57 return (RawVAPtr & Flags) == StmtMode;
60 const VariableArrayType *getVAPtr() const {
61 return reinterpret_cast<const VariableArrayType*>(RawVAPtr & ~Flags);
64 void setVAPtr(const VariableArrayType *P) {
65 assert(inDeclGroup() || inSizeOfTypeVA());
66 RawVAPtr = reinterpret_cast<uintptr_t>(P) | (RawVAPtr & Flags);
69 void NextDecl(bool ImmediateAdvance = true);
70 bool HandleDecl(Decl* D);
73 Stmt*& GetDeclExpr() const;
76 template <typename DERIVED, typename REFERENCE>
77 class StmtIteratorImpl : public StmtIteratorBase,
78 public std::iterator<std::forward_iterator_tag,
80 REFERENCE, REFERENCE> {
82 StmtIteratorImpl(const StmtIteratorBase& RHS) : StmtIteratorBase(RHS) {}
85 StmtIteratorImpl() = default;
86 StmtIteratorImpl(Stmt **s) : StmtIteratorBase(s) {}
87 StmtIteratorImpl(Decl **dgi, Decl **dge) : StmtIteratorBase(dgi, dge) {}
88 StmtIteratorImpl(const VariableArrayType *t) : StmtIteratorBase(t) {}
90 DERIVED& operator++() {
98 return static_cast<DERIVED&>(*this);
101 DERIVED operator++(int) {
102 DERIVED tmp = static_cast<DERIVED&>(*this);
107 bool operator==(const DERIVED& RHS) const {
108 return stmt == RHS.stmt && DGI == RHS.DGI && RawVAPtr == RHS.RawVAPtr;
111 bool operator!=(const DERIVED& RHS) const {
112 return stmt != RHS.stmt || DGI != RHS.DGI || RawVAPtr != RHS.RawVAPtr;
115 REFERENCE operator*() const {
116 return inStmt() ? *stmt : GetDeclExpr();
119 REFERENCE operator->() const { return operator*(); }
122 struct ConstStmtIterator;
124 struct StmtIterator : public StmtIteratorImpl<StmtIterator, Stmt*&> {
125 explicit StmtIterator() = default;
126 StmtIterator(Stmt** S) : StmtIteratorImpl<StmtIterator, Stmt*&>(S) {}
127 StmtIterator(Decl** dgi, Decl** dge)
128 : StmtIteratorImpl<StmtIterator, Stmt*&>(dgi, dge) {}
129 StmtIterator(const VariableArrayType *t)
130 : StmtIteratorImpl<StmtIterator, Stmt*&>(t) {}
133 StmtIterator(const StmtIteratorBase &RHS)
134 : StmtIteratorImpl<StmtIterator, Stmt *&>(RHS) {}
136 inline friend StmtIterator
137 cast_away_const(const ConstStmtIterator &RHS);
140 struct ConstStmtIterator : public StmtIteratorImpl<ConstStmtIterator,
142 explicit ConstStmtIterator() = default;
143 ConstStmtIterator(const StmtIterator& RHS)
144 : StmtIteratorImpl<ConstStmtIterator, const Stmt*>(RHS) {}
146 ConstStmtIterator(Stmt * const *S)
147 : StmtIteratorImpl<ConstStmtIterator, const Stmt *>(
148 const_cast<Stmt **>(S)) {}
151 inline StmtIterator cast_away_const(const ConstStmtIterator &RHS) {
157 #endif // LLVM_CLANG_AST_STMTITERATOR_H