146 lines
4.0 KiB
C++
146 lines
4.0 KiB
C++
//===--- StmtIterator.h - Iterators for Statements ------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the StmtIterator and ConstStmtIterator classes.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_AST_STMT_ITR_H
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#define LLVM_CLANG_AST_STMT_ITR_H
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#include "llvm/System/DataTypes.h"
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#include <cassert>
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#include <iterator>
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namespace clang {
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class Stmt;
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class Decl;
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class VariableArrayType;
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class StmtIteratorBase {
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protected:
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enum { DeclMode = 0x1, SizeOfTypeVAMode = 0x2, DeclGroupMode = 0x3,
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Flags = 0x3 };
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union { Stmt** stmt; Decl* decl; Decl** DGI; };
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uintptr_t RawVAPtr;
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Decl** DGE;
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bool inDecl() const {
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return (RawVAPtr & Flags) == DeclMode;
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}
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bool inDeclGroup() const {
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return (RawVAPtr & Flags) == DeclGroupMode;
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}
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bool inSizeOfTypeVA() const {
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return (RawVAPtr & Flags) == SizeOfTypeVAMode;
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}
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bool inStmt() const {
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return (RawVAPtr & Flags) == 0;
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}
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VariableArrayType* getVAPtr() const {
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return reinterpret_cast<VariableArrayType*>(RawVAPtr & ~Flags);
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}
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void setVAPtr(VariableArrayType* P) {
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assert (inDecl() || inDeclGroup() || inSizeOfTypeVA());
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RawVAPtr = reinterpret_cast<uintptr_t>(P) | (RawVAPtr & Flags);
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}
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void NextDecl(bool ImmediateAdvance = true);
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bool HandleDecl(Decl* D);
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void NextVA();
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Stmt*& GetDeclExpr() const;
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StmtIteratorBase(Stmt** s) : stmt(s), RawVAPtr(0) {}
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StmtIteratorBase(Decl* d);
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StmtIteratorBase(VariableArrayType* t);
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StmtIteratorBase(Decl** dgi, Decl** dge);
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StmtIteratorBase() : stmt(NULL), RawVAPtr(0) {}
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};
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template <typename DERIVED, typename REFERENCE>
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class StmtIteratorImpl : public StmtIteratorBase,
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public std::iterator<std::forward_iterator_tag,
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REFERENCE, ptrdiff_t,
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REFERENCE, REFERENCE> {
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protected:
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StmtIteratorImpl(const StmtIteratorBase& RHS) : StmtIteratorBase(RHS) {}
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public:
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StmtIteratorImpl() {}
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StmtIteratorImpl(Stmt** s) : StmtIteratorBase(s) {}
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StmtIteratorImpl(Decl** dgi, Decl** dge) : StmtIteratorBase(dgi, dge) {}
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StmtIteratorImpl(Decl* d) : StmtIteratorBase(d) {}
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StmtIteratorImpl(VariableArrayType* t) : StmtIteratorBase(t) {}
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DERIVED& operator++() {
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if (inDecl() || inDeclGroup()) {
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if (getVAPtr()) NextVA();
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else NextDecl();
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}
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else if (inSizeOfTypeVA())
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NextVA();
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else
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++stmt;
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return static_cast<DERIVED&>(*this);
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}
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DERIVED operator++(int) {
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DERIVED tmp = static_cast<DERIVED&>(*this);
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operator++();
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return tmp;
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}
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bool operator==(const DERIVED& RHS) const {
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return stmt == RHS.stmt && RawVAPtr == RHS.RawVAPtr;
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}
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bool operator!=(const DERIVED& RHS) const {
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return stmt != RHS.stmt || RawVAPtr != RHS.RawVAPtr;
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}
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REFERENCE operator*() const {
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return (REFERENCE) (inStmt() ? *stmt : GetDeclExpr());
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}
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REFERENCE operator->() const { return operator*(); }
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};
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struct StmtIterator : public StmtIteratorImpl<StmtIterator,Stmt*&> {
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explicit StmtIterator() : StmtIteratorImpl<StmtIterator,Stmt*&>() {}
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StmtIterator(Stmt** S) : StmtIteratorImpl<StmtIterator,Stmt*&>(S) {}
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StmtIterator(Decl** dgi, Decl** dge)
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: StmtIteratorImpl<StmtIterator,Stmt*&>(dgi, dge) {}
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StmtIterator(VariableArrayType* t):StmtIteratorImpl<StmtIterator,Stmt*&>(t) {}
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StmtIterator(Decl* D) : StmtIteratorImpl<StmtIterator,Stmt*&>(D) {}
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};
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struct ConstStmtIterator : public StmtIteratorImpl<ConstStmtIterator,
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const Stmt*> {
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explicit ConstStmtIterator() :
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StmtIteratorImpl<ConstStmtIterator,const Stmt*>() {}
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ConstStmtIterator(const StmtIterator& RHS) :
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StmtIteratorImpl<ConstStmtIterator,const Stmt*>(RHS) {}
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};
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} // end namespace clang
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#endif
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