1 //===--- StmtIterator.h - Iterators for Statements --------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the StmtIterator and ConstStmtIterator classes.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_AST_STMT_ITR_H
15 #define LLVM_CLANG_AST_STMT_ITR_H
17 #include "llvm/Support/DataTypes.h"
27 class VariableArrayType;
29 class StmtIteratorBase {
31 enum { DeclMode = 0x1, SizeOfTypeVAMode = 0x2, DeclGroupMode = 0x3,
35 union { Decl *decl; Decl **DGI; };
40 return (RawVAPtr & Flags) == DeclMode;
43 bool inDeclGroup() const {
44 return (RawVAPtr & Flags) == DeclGroupMode;
47 bool inSizeOfTypeVA() const {
48 return (RawVAPtr & Flags) == SizeOfTypeVAMode;
52 return (RawVAPtr & Flags) == 0;
55 const VariableArrayType *getVAPtr() const {
56 return reinterpret_cast<const VariableArrayType*>(RawVAPtr & ~Flags);
59 void setVAPtr(const VariableArrayType *P) {
60 assert (inDecl() || inDeclGroup() || inSizeOfTypeVA());
61 RawVAPtr = reinterpret_cast<uintptr_t>(P) | (RawVAPtr & Flags);
64 void NextDecl(bool ImmediateAdvance = true);
65 bool HandleDecl(Decl* D);
68 Stmt*& GetDeclExpr() const;
70 StmtIteratorBase(Stmt **s) : stmt(s), decl(0), RawVAPtr(0) {}
71 StmtIteratorBase(Decl *d, Stmt **s);
72 StmtIteratorBase(const VariableArrayType *t);
73 StmtIteratorBase(Decl **dgi, Decl **dge);
74 StmtIteratorBase() : stmt(0), decl(0), RawVAPtr(0) {}
78 template <typename DERIVED, typename REFERENCE>
79 class StmtIteratorImpl : public StmtIteratorBase,
80 public std::iterator<std::forward_iterator_tag,
82 REFERENCE, REFERENCE> {
84 StmtIteratorImpl(const StmtIteratorBase& RHS) : StmtIteratorBase(RHS) {}
87 StmtIteratorImpl(Stmt **s) : StmtIteratorBase(s) {}
88 StmtIteratorImpl(Decl **dgi, Decl **dge) : StmtIteratorBase(dgi, dge) {}
89 StmtIteratorImpl(Decl *d, Stmt **s) : StmtIteratorBase(d, s) {}
90 StmtIteratorImpl(const VariableArrayType *t) : StmtIteratorBase(t) {}
92 DERIVED& operator++() {
93 if (inDecl() || inDeclGroup()) {
94 if (getVAPtr()) NextVA();
97 else if (inSizeOfTypeVA())
102 return static_cast<DERIVED&>(*this);
105 DERIVED operator++(int) {
106 DERIVED tmp = static_cast<DERIVED&>(*this);
111 bool operator==(const DERIVED& RHS) const {
112 return stmt == RHS.stmt && decl == RHS.decl && RawVAPtr == RHS.RawVAPtr;
115 bool operator!=(const DERIVED& RHS) const {
116 return stmt != RHS.stmt || decl != RHS.decl || RawVAPtr != RHS.RawVAPtr;
119 REFERENCE operator*() const {
120 return (REFERENCE) (inStmt() ? *stmt : GetDeclExpr());
123 REFERENCE operator->() const { return operator*(); }
126 struct StmtIterator : public StmtIteratorImpl<StmtIterator,Stmt*&> {
127 explicit StmtIterator() : StmtIteratorImpl<StmtIterator,Stmt*&>() {}
129 StmtIterator(Stmt** S) : StmtIteratorImpl<StmtIterator,Stmt*&>(S) {}
131 StmtIterator(Decl** dgi, Decl** dge)
132 : StmtIteratorImpl<StmtIterator,Stmt*&>(dgi, dge) {}
134 StmtIterator(const VariableArrayType *t)
135 : StmtIteratorImpl<StmtIterator,Stmt*&>(t) {}
137 StmtIterator(Decl* D, Stmt **s = 0)
138 : StmtIteratorImpl<StmtIterator,Stmt*&>(D, s) {}
141 struct ConstStmtIterator : public StmtIteratorImpl<ConstStmtIterator,
143 explicit ConstStmtIterator() :
144 StmtIteratorImpl<ConstStmtIterator,const Stmt*>() {}
146 ConstStmtIterator(const StmtIterator& RHS) :
147 StmtIteratorImpl<ConstStmtIterator,const Stmt*>(RHS) {}
150 /// A range of statement iterators.
152 /// This class provides some extra functionality beyond std::pair
153 /// in order to allow the following idiom:
154 /// for (StmtRange range = stmt->children(); range; ++range)
155 struct StmtRange : std::pair<StmtIterator,StmtIterator> {
157 StmtRange(const StmtIterator &begin, const StmtIterator &end)
158 : std::pair<StmtIterator,StmtIterator>(begin, end) {}
160 bool empty() const { return first == second; }
161 operator bool() const { return !empty(); }
163 Stmt *operator->() const { return first.operator->(); }
164 Stmt *&operator*() const { return first.operator*(); }
166 StmtRange &operator++() {
167 assert(!empty() && "incrementing on empty range");
172 StmtRange operator++(int) {
173 assert(!empty() && "incrementing on empty range");
174 StmtRange copy = *this;
179 friend const StmtIterator &begin(const StmtRange &range) {
182 friend const StmtIterator &end(const StmtRange &range) {
187 /// A range of const statement iterators.
189 /// This class provides some extra functionality beyond std::pair
190 /// in order to allow the following idiom:
191 /// for (ConstStmtRange range = stmt->children(); range; ++range)
192 struct ConstStmtRange : std::pair<ConstStmtIterator,ConstStmtIterator> {
194 ConstStmtRange(const ConstStmtIterator &begin,
195 const ConstStmtIterator &end)
196 : std::pair<ConstStmtIterator,ConstStmtIterator>(begin, end) {}
197 ConstStmtRange(const StmtRange &range)
198 : std::pair<ConstStmtIterator,ConstStmtIterator>(range.first, range.second)
200 ConstStmtRange(const StmtIterator &begin, const StmtIterator &end)
201 : std::pair<ConstStmtIterator,ConstStmtIterator>(begin, end) {}
203 bool empty() const { return first == second; }
204 operator bool() const { return !empty(); }
206 const Stmt *operator->() const { return first.operator->(); }
207 const Stmt *operator*() const { return first.operator*(); }
209 ConstStmtRange &operator++() {
210 assert(!empty() && "incrementing on empty range");
215 ConstStmtRange operator++(int) {
216 assert(!empty() && "incrementing on empty range");
217 ConstStmtRange copy = *this;
222 friend const ConstStmtIterator &begin(const ConstStmtRange &range) {
225 friend const ConstStmtIterator &end(const ConstStmtRange &range) {
230 } // end namespace clang