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📄 APFloat.h(48.83 KB)
📄 APInt.h(74.48 KB)
📄 APSInt.h(11.75 KB)
📄 AllocatorList.h(7.53 KB)
📄 Any.h(5.05 KB)
📄 ArrayRef.h(17.92 KB)
📄 BitVector.h(29.74 KB)
📄 Bitfields.h(11.65 KB)
📄 BitmaskEnum.h(5.53 KB)
📄 BreadthFirstIterator.h(4.82 KB)
📄 CachedHashString.h(5.9 KB)
📄 CoalescingBitVector.h(14.91 KB)
📄 DAGDeltaAlgorithm.h(3.13 KB)
📄 DeltaAlgorithm.h(3.54 KB)
📄 DenseMap.h(43.14 KB)
📄 DenseMapInfo.h(11.4 KB)
📄 DenseSet.h(9.33 KB)
📄 DepthFirstIterator.h(10.37 KB)
📄 DirectedGraph.h(9.56 KB)
📄 EnumeratedArray.h(1.6 KB)
📄 EpochTracker.h(3.2 KB)
📄 EquivalenceClasses.h(10.52 KB)
📄 FloatingPointMode.h(5.62 KB)
📄 FoldingSet.h(30.16 KB)
📄 FunctionExtras.h(14.55 KB)
📄 GraphTraits.h(5.71 KB)
📄 Hashing.h(25.12 KB)
📄 ImmutableList.h(7.57 KB)
📄 ImmutableMap.h(10.84 KB)
📄 ImmutableSet.h(37.52 KB)
📄 IndexedMap.h(2.5 KB)
📄 IntEqClasses.h(2.87 KB)
📄 IntervalMap.h(72.88 KB)
📄 IntrusiveRefCntPtr.h(8.1 KB)
📄 MapVector.h(7.79 KB)
📄 None.h(983 B)
📄 Optional.h(10.82 KB)
📄 PackedVector.h(4.17 KB)
📄 PointerEmbeddedInt.h(4.05 KB)
📄 PointerIntPair.h(8.72 KB)
📄 PointerSumType.h(11.61 KB)
📄 PointerUnion.h(10.17 KB)
📄 PostOrderIterator.h(11.05 KB)
📄 PriorityQueue.h(2.69 KB)
📄 PriorityWorklist.h(8.11 KB)
📄 SCCIterator.h(8.02 KB)
📄 STLExtras.h(70.56 KB)
📄 ScopeExit.h(1.83 KB)
📄 ScopedHashTable.h(8.27 KB)
📄 Sequence.h(2.59 KB)
📄 SetOperations.h(2.58 KB)
📄 SetVector.h(9.39 KB)
📄 SmallBitVector.h(20.36 KB)
📄 SmallPtrSet.h(16.93 KB)
📄 SmallSet.h(8.37 KB)
📄 SmallString.h(8.55 KB)
📄 SmallVector.h(32.33 KB)
📄 SparseBitVector.h(26.2 KB)
📄 SparseMultiSet.h(17.83 KB)
📄 SparseSet.h(11.41 KB)
📄 Statistic.h(7.01 KB)
📄 StringExtras.h(13.25 KB)
📄 StringMap.h(15.7 KB)
📄 StringMapEntry.h(4.83 KB)
📄 StringRef.h(31.68 KB)
📄 StringSet.h(1.51 KB)
📄 StringSwitch.h(6.25 KB)
📄 TinyPtrVector.h(10.19 KB)
📄 Triple.h(27.4 KB)
📄 Twine.h(17.48 KB)
📄 TypeSwitch.h(5.82 KB)
📄 UniqueVector.h(3.09 KB)
📄 Waymarking.h(11.96 KB)
📄 bit.h(2.26 KB)
📄 edit_distance.h(3.57 KB)
📄 fallible_iterator.h(8.31 KB)
📄 ilist.h(13.68 KB)
📄 ilist_base.h(2.72 KB)
📄 ilist_iterator.h(7.21 KB)
📄 ilist_node.h(9.84 KB)
📄 ilist_node_base.h(1.7 KB)
📄 ilist_node_options.h(5.07 KB)
📄 iterator.h(13.46 KB)
📄 iterator_range.h(2.22 KB)
📄 simple_ilist.h(10.78 KB)

Editing: DepthFirstIterator.h

//===- llvm/ADT/DepthFirstIterator.h - Depth First iterator -----*- 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 builds on the ADT/GraphTraits.h file to build generic depth
// first graph iterator.  This file exposes the following functions/types:
//
// df_begin/df_end/df_iterator
//   * Normal depth-first iteration - visit a node and then all of its children.
//
// idf_begin/idf_end/idf_iterator
//   * Depth-first iteration on the 'inverse' graph.
//
// df_ext_begin/df_ext_end/df_ext_iterator
//   * Normal depth-first iteration - visit a node and then all of its children.
//     This iterator stores the 'visited' set in an external set, which allows
//     it to be more efficient, and allows external clients to use the set for
//     other purposes.
//
// idf_ext_begin/idf_ext_end/idf_ext_iterator
//   * Depth-first iteration on the 'inverse' graph.
//     This iterator stores the 'visited' set in an external set, which allows
//     it to be more efficient, and allows external clients to use the set for
//     other purposes.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_DEPTHFIRSTITERATOR_H
#define LLVM_ADT_DEPTHFIRSTITERATOR_H

#include "llvm/ADT/GraphTraits.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/iterator_range.h"
#include <iterator>
#include <set>
#include <utility>
#include <vector>

namespace llvm {

// df_iterator_storage - A private class which is used to figure out where to
// store the visited set.
template<class SetType, bool External>   // Non-external set
class df_iterator_storage {
public:
  SetType Visited;
};

template<class SetType>
class df_iterator_storage<SetType, true> {
public:
  df_iterator_storage(SetType &VSet) : Visited(VSet) {}
  df_iterator_storage(const df_iterator_storage &S) : Visited(S.Visited) {}

SetType &Visited;
};

// The visited stated for the iteration is a simple set augmented with
// one more method, completed, which is invoked when all children of a
// node have been processed. It is intended to distinguish of back and
// cross edges in the spanning tree but is not used in the common case.
template <typename NodeRef, unsigned SmallSize=8>
struct df_iterator_default_set : public SmallPtrSet<NodeRef, SmallSize> {
  using BaseSet = SmallPtrSet<NodeRef, SmallSize>;
  using iterator = typename BaseSet::iterator;

std::pair<iterator,bool> insert(NodeRef N) { return BaseSet::insert(N); }
  template <typename IterT>
  void insert(IterT Begin, IterT End) { BaseSet::insert(Begin,End); }

void completed(NodeRef) {}
};

// Generic Depth First Iterator
template <class GraphT,
          class SetType =
              df_iterator_default_set<typename GraphTraits<GraphT>::NodeRef>,
          bool ExtStorage = false, class GT = GraphTraits<GraphT>>
class df_iterator
    : public std::iterator<std::forward_iterator_tag, typename GT::NodeRef>,
      public df_iterator_storage<SetType, ExtStorage> {
  using super = std::iterator<std::forward_iterator_tag, typename GT::NodeRef>;
  using NodeRef = typename GT::NodeRef;
  using ChildItTy = typename GT::ChildIteratorType;

// First element is node reference, second is the 'next child' to visit.
  // The second child is initialized lazily to pick up graph changes during the
  // DFS.
  using StackElement = std::pair<NodeRef, Optional<ChildItTy>>;

// VisitStack - Used to maintain the ordering.  Top = current block
  std::vector<StackElement> VisitStack;

private:
  inline df_iterator(NodeRef Node) {
    this->Visited.insert(Node);
    VisitStack.push_back(StackElement(Node, None));
  }

inline df_iterator() = default; // End is when stack is empty

inline df_iterator(NodeRef Node, SetType &S)
      : df_iterator_storage<SetType, ExtStorage>(S) {
    if (this->Visited.insert(Node).second)
      VisitStack.push_back(StackElement(Node, None));
  }

inline df_iterator(SetType &S)
    : df_iterator_storage<SetType, ExtStorage>(S) {
    // End is when stack is empty
  }

inline void toNext() {
    do {
      NodeRef Node = VisitStack.back().first;
      Optional<ChildItTy> &Opt = VisitStack.back().second;

if (!Opt)
        Opt.emplace(GT::child_begin(Node));

// Notice that we directly mutate *Opt here, so that
      // VisitStack.back().second actually gets updated as the iterator
      // increases.
      while (*Opt != GT::child_end(Node)) {
        NodeRef Next = *(*Opt)++;
        // Has our next sibling been visited?
        if (this->Visited.insert(Next).second) {
          // No, do it now.
          VisitStack.push_back(StackElement(Next, None));
          return;
        }
      }
      this->Visited.completed(Node);

// Oops, ran out of successors... go up a level on the stack.
      VisitStack.pop_back();
    } while (!VisitStack.empty());
  }

public:
  using pointer = typename super::pointer;

// Provide static begin and end methods as our public "constructors"
  static df_iterator begin(const GraphT &G) {
    return df_iterator(GT::getEntryNode(G));
  }
  static df_iterator end(const GraphT &G) { return df_iterator(); }

// Static begin and end methods as our public ctors for external iterators
  static df_iterator begin(const GraphT &G, SetType &S) {
    return df_iterator(GT::getEntryNode(G), S);
  }
  static df_iterator end(const GraphT &G, SetType &S) { return df_iterator(S); }

bool operator==(const df_iterator &x) const {
    return VisitStack == x.VisitStack;
  }
  bool operator!=(const df_iterator &x) const { return !(*this == x); }

const NodeRef &operator*() const { return VisitStack.back().first; }

// This is a nonstandard operator-> that dereferences the pointer an extra
  // time... so that you can actually call methods ON the Node, because
  // the contained type is a pointer.  This allows BBIt->getTerminator() f.e.
  //
  NodeRef operator->() const { return **this; }

df_iterator &operator++() { // Preincrement
    toNext();
    return *this;
  }

/// Skips all children of the current node and traverses to next node
  ///
  /// Note: This function takes care of incrementing the iterator. If you
  /// always increment and call this function, you risk walking off the end.
  df_iterator &skipChildren() {
    VisitStack.pop_back();
    if (!VisitStack.empty())
      toNext();
    return *this;
  }

df_iterator operator++(int) { // Postincrement
    df_iterator tmp = *this;
    ++*this;
    return tmp;
  }

// nodeVisited - return true if this iterator has already visited the
  // specified node.  This is public, and will probably be used to iterate over
  // nodes that a depth first iteration did not find: ie unreachable nodes.
  //
  bool nodeVisited(NodeRef Node) const {
    return this->Visited.count(Node) != 0;
  }

/// getPathLength - Return the length of the path from the entry node to the
  /// current node, counting both nodes.
  unsigned getPathLength() const { return VisitStack.size(); }

/// getPath - Return the n'th node in the path from the entry node to the
  /// current node.
  NodeRef getPath(unsigned n) const { return VisitStack[n].first; }
};

// Provide global constructors that automatically figure out correct types...
//
template <class T>
df_iterator<T> df_begin(const T& G) {
  return df_iterator<T>::begin(G);
}

template <class T>
df_iterator<T> df_end(const T& G) {
  return df_iterator<T>::end(G);
}

// Provide an accessor method to use them in range-based patterns.
template <class T>
iterator_range<df_iterator<T>> depth_first(const T& G) {
  return make_range(df_begin(G), df_end(G));
}

// Provide global definitions of external depth first iterators...
template <class T, class SetTy = std::set<typename GraphTraits<T>::NodeRef>>
struct df_ext_iterator : public df_iterator<T, SetTy, true> {
  df_ext_iterator(const df_iterator<T, SetTy, true> &V)
    : df_iterator<T, SetTy, true>(V) {}
};

template <class T, class SetTy>
df_ext_iterator<T, SetTy> df_ext_begin(const T& G, SetTy &S) {
  return df_ext_iterator<T, SetTy>::begin(G, S);
}

template <class T, class SetTy>
df_ext_iterator<T, SetTy> df_ext_end(const T& G, SetTy &S) {
  return df_ext_iterator<T, SetTy>::end(G, S);
}

template <class T, class SetTy>
iterator_range<df_ext_iterator<T, SetTy>> depth_first_ext(const T& G,
                                                          SetTy &S) {
  return make_range(df_ext_begin(G, S), df_ext_end(G, S));
}

// Provide global definitions of inverse depth first iterators...
template <class T,
          class SetTy =
              df_iterator_default_set<typename GraphTraits<T>::NodeRef>,
          bool External = false>
struct idf_iterator : public df_iterator<Inverse<T>, SetTy, External> {
  idf_iterator(const df_iterator<Inverse<T>, SetTy, External> &V)
    : df_iterator<Inverse<T>, SetTy, External>(V) {}
};

template <class T>
idf_iterator<T> idf_begin(const T& G) {
  return idf_iterator<T>::begin(Inverse<T>(G));
}

template <class T>
idf_iterator<T> idf_end(const T& G){
  return idf_iterator<T>::end(Inverse<T>(G));
}

// Provide an accessor method to use them in range-based patterns.
template <class T>
iterator_range<idf_iterator<T>> inverse_depth_first(const T& G) {
  return make_range(idf_begin(G), idf_end(G));
}

// Provide global definitions of external inverse depth first iterators...
template <class T, class SetTy = std::set<typename GraphTraits<T>::NodeRef>>
struct idf_ext_iterator : public idf_iterator<T, SetTy, true> {
  idf_ext_iterator(const idf_iterator<T, SetTy, true> &V)
    : idf_iterator<T, SetTy, true>(V) {}
  idf_ext_iterator(const df_iterator<Inverse<T>, SetTy, true> &V)
    : idf_iterator<T, SetTy, true>(V) {}
};

template <class T, class SetTy>
idf_ext_iterator<T, SetTy> idf_ext_begin(const T& G, SetTy &S) {
  return idf_ext_iterator<T, SetTy>::begin(Inverse<T>(G), S);
}

template <class T, class SetTy>
idf_ext_iterator<T, SetTy> idf_ext_end(const T& G, SetTy &S) {
  return idf_ext_iterator<T, SetTy>::end(Inverse<T>(G), S);
}

template <class T, class SetTy>
iterator_range<idf_ext_iterator<T, SetTy>> inverse_depth_first_ext(const T& G,
                                                                   SetTy &S) {
  return make_range(idf_ext_begin(G, S), idf_ext_end(G, S));
}

} // end namespace llvm

#endif // LLVM_ADT_DEPTHFIRSTITERATOR_H

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