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