1 //===--- StmtIterator.h - Iterators for Statements ------------------------===//
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/ADT/iterator.h"
18 #include "llvm/Support/DataTypes.h"
25 class VariableArrayType;
27 class StmtIteratorBase {
29 enum { DeclMode = 0x1, SizeOfTypeVAMode = 0x2, DeclGroupMode = 0x3,
32 union { Stmt** stmt; Decl* decl; Decl** DGI; };
37 return (RawVAPtr & Flags) == DeclMode;
40 bool inDeclGroup() const {
41 return (RawVAPtr & Flags) == DeclGroupMode;
44 bool inSizeOfTypeVA() const {
45 return (RawVAPtr & Flags) == SizeOfTypeVAMode;
49 return (RawVAPtr & Flags) == 0;
52 VariableArrayType* getVAPtr() const {
53 return reinterpret_cast<VariableArrayType*>(RawVAPtr & ~Flags);
56 void setVAPtr(VariableArrayType* P) {
57 assert (inDecl() || inDeclGroup() || inSizeOfTypeVA());
58 RawVAPtr = reinterpret_cast<uintptr_t>(P) | (RawVAPtr & Flags);
61 void NextDecl(bool ImmediateAdvance = true);
62 bool HandleDecl(Decl* D);
65 Stmt*& GetDeclExpr() const;
67 StmtIteratorBase(Stmt** s) : stmt(s), RawVAPtr(0) {}
68 StmtIteratorBase(Decl* d);
69 StmtIteratorBase(VariableArrayType* t);
70 StmtIteratorBase(Decl** dgi, Decl** dge);
71 StmtIteratorBase() : stmt(NULL), RawVAPtr(0) {}
75 template <typename DERIVED, typename REFERENCE>
76 class StmtIteratorImpl : public StmtIteratorBase,
77 public std::iterator<std::forward_iterator_tag,
79 REFERENCE, REFERENCE> {
81 StmtIteratorImpl(const StmtIteratorBase& RHS) : StmtIteratorBase(RHS) {}
84 StmtIteratorImpl(Stmt** s) : StmtIteratorBase(s) {}
85 StmtIteratorImpl(Decl** dgi, Decl** dge) : StmtIteratorBase(dgi, dge) {}
86 StmtIteratorImpl(Decl* d) : StmtIteratorBase(d) {}
87 StmtIteratorImpl(VariableArrayType* t) : StmtIteratorBase(t) {}
89 DERIVED& operator++() {
90 if (inDecl() || inDeclGroup()) {
91 if (getVAPtr()) NextVA();
94 else if (inSizeOfTypeVA())
99 return static_cast<DERIVED&>(*this);
102 DERIVED operator++(int) {
103 DERIVED tmp = static_cast<DERIVED&>(*this);
108 bool operator==(const DERIVED& RHS) const {
109 return stmt == RHS.stmt && RawVAPtr == RHS.RawVAPtr;
112 bool operator!=(const DERIVED& RHS) const {
113 return stmt != RHS.stmt || RawVAPtr != RHS.RawVAPtr;
116 REFERENCE operator*() const {
117 return (REFERENCE) (inStmt() ? *stmt : GetDeclExpr());
120 REFERENCE operator->() const { return operator*(); }
123 struct StmtIterator : public StmtIteratorImpl<StmtIterator,Stmt*&> {
124 explicit StmtIterator() : StmtIteratorImpl<StmtIterator,Stmt*&>() {}
126 StmtIterator(Stmt** S) : StmtIteratorImpl<StmtIterator,Stmt*&>(S) {}
127 StmtIterator(Decl** dgi, Decl** dge)
128 : StmtIteratorImpl<StmtIterator,Stmt*&>(dgi, dge) {}
130 StmtIterator(VariableArrayType* t):StmtIteratorImpl<StmtIterator,Stmt*&>(t) {}
131 StmtIterator(Decl* D) : StmtIteratorImpl<StmtIterator,Stmt*&>(D) {}
134 struct ConstStmtIterator : public StmtIteratorImpl<ConstStmtIterator,
136 explicit ConstStmtIterator() :
137 StmtIteratorImpl<ConstStmtIterator,const Stmt*>() {}
139 ConstStmtIterator(const StmtIterator& RHS) :
140 StmtIteratorImpl<ConstStmtIterator,const Stmt*>(RHS) {}
143 } // end namespace clang