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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: BreadthFirstIterator.h

//===- llvm/ADT/BreadthFirstIterator.h - Breadth 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 a generic breadth
// first graph iterator.  This file exposes the following functions/types:
//
// bf_begin/bf_end/bf_iterator
//   * Normal breadth-first iteration - visit a graph level-by-level.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_BREADTHFIRSTITERATOR_H
#define LLVM_ADT_BREADTHFIRSTITERATOR_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 <queue>
#include <utility>

namespace llvm {

// bf_iterator_storage - A private class which is used to figure out where to
// store the visited set. We only provide a non-external variant for now.
template <class SetType> class bf_iterator_storage {
public:
  SetType Visited;
};

// The visited state for the iteration is a simple set.
template <typename NodeRef, unsigned SmallSize = 8>
using bf_iterator_default_set = SmallPtrSet<NodeRef, SmallSize>;

// Generic Breadth first search iterator.
template <class GraphT,
          class SetType =
              bf_iterator_default_set<typename GraphTraits<GraphT>::NodeRef>,
          class GT = GraphTraits<GraphT>>
class bf_iterator
    : public std::iterator<std::forward_iterator_tag, typename GT::NodeRef>,
      public bf_iterator_storage<SetType> {
  using super = std::iterator<std::forward_iterator_tag, typename GT::NodeRef>;

using NodeRef = typename GT::NodeRef;
  using ChildItTy = typename GT::ChildIteratorType;

// First element is the node reference, second is the next child to visit.
  using QueueElement = std::pair<NodeRef, Optional<ChildItTy>>;

// Visit queue - used to maintain BFS ordering.
  // Optional<> because we need markers for levels.
  std::queue<Optional<QueueElement>> VisitQueue;

// Current level.
  unsigned Level;

private:
  inline bf_iterator(NodeRef Node) {
    this->Visited.insert(Node);
    Level = 0;

// Also, insert a dummy node as marker.
    VisitQueue.push(QueueElement(Node, None));
    VisitQueue.push(None);
  }

inline bf_iterator() = default;

inline void toNext() {
    Optional<QueueElement> Head = VisitQueue.front();
    QueueElement H = Head.getValue();
    NodeRef Node = H.first;
    Optional<ChildItTy> &ChildIt = H.second;

if (!ChildIt)
      ChildIt.emplace(GT::child_begin(Node));
    while (*ChildIt != GT::child_end(Node)) {
      NodeRef Next = *(*ChildIt)++;

// Already visited?
      if (this->Visited.insert(Next).second)
        VisitQueue.push(QueueElement(Next, None));
    }
    VisitQueue.pop();

// Go to the next element skipping markers if needed.
    if (!VisitQueue.empty()) {
      Head = VisitQueue.front();
      if (Head != None)
        return;
      Level += 1;
      VisitQueue.pop();

// Don't push another marker if this is the last
      // element.
      if (!VisitQueue.empty())
        VisitQueue.push(None);
    }
  }

public:
  using pointer = typename super::pointer;

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

static bf_iterator end(const GraphT &G) { return bf_iterator(); }

bool operator==(const bf_iterator &RHS) const {
    return VisitQueue == RHS.VisitQueue;
  }

bool operator!=(const bf_iterator &RHS) const { return !(*this == RHS); }

const NodeRef &operator*() const { return VisitQueue.front()->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.
  NodeRef operator->() const { return **this; }

bf_iterator &operator++() { // Pre-increment
    toNext();
    return *this;
  }

bf_iterator operator++(int) { // Post-increment
    bf_iterator ItCopy = *this;
    ++*this;
    return ItCopy;
  }

unsigned getLevel() const { return Level; }
};

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

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

// Provide an accessor method to use them in range-based patterns.
template <class T> iterator_range<bf_iterator<T>> breadth_first(const T &G) {
  return make_range(bf_begin(G), bf_end(G));
}

} // end namespace llvm

#endif // LLVM_ADT_BREADTHFIRSTITERATOR_H

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