//===- StmtGraphTraits.h - Graph Traits for the class Stmt ------*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

//  This file defines a template specialization of llvm::GraphTraits to

//  treat ASTs (Stmt*) as graphs

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_AST_STMTGRAPHTRAITS_H

#define LLVM_CLANG_AST_STMTGRAPHTRAITS_H

#include "clang/AST/Stmt.h"

#include "llvm/ADT/DepthFirstIterator.h"

#include "llvm/ADT/GraphTraits.h"

namespace llvm {

template <> struct GraphTraits<clang::Stmt *> {

  using NodeRef = clang::Stmt *;

  using ChildIteratorType = clang::Stmt::child_iterator;

  using nodes_iterator = llvm::df_iterator<clang::Stmt *>;

  static NodeRef getEntryNode(clang::Stmt *S) { return S; }

  static ChildIteratorType child_begin(NodeRef N) {

    if (N) return N->child_begin();

    else return ChildIteratorType();

  }

  static ChildIteratorType child_end(NodeRef N) {

    if (N) return N->child_end();

    else return ChildIteratorType();

  }

  static nodes_iterator nodes_begin(clang::Stmt* S) {

    return df_begin(S);

  }

  static nodes_iterator nodes_end(clang::Stmt* S) {

    return df_end(S);

  }

};

template <> struct GraphTraits<const clang::Stmt *> {

  using NodeRef = const clang::Stmt *;

  using ChildIteratorType = clang::Stmt::const_child_iterator;

  using nodes_iterator = llvm::df_iterator<const clang::Stmt *>;

  static NodeRef getEntryNode(const clang::Stmt *S) { return S; }

  static ChildIteratorType child_begin(NodeRef N) {

    if (N) return N->child_begin();

    else return ChildIteratorType();

  }

  static ChildIteratorType child_end(NodeRef N) {

    if (N) return N->child_end();

    else return ChildIteratorType();

  }

  static nodes_iterator nodes_begin(const clang::Stmt* S) {

    return df_begin(S);

  }

  static nodes_iterator nodes_end(const clang::Stmt* S) {

    return df_end(S);

  }

};

} // namespace llvm

#endif // LLVM_CLANG_AST_STMTGRAPHTRAITS_H