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From GitBox <...@apache.org>
Subject [GitHub] [incubator-tvm] junrushao1994 commented on a change in pull request #5585: [Runtime] Introduce runtime::Array
Date Sun, 17 May 2020 00:40:48 GMT

junrushao1994 commented on a change in pull request #5585:
URL: https://github.com/apache/incubator-tvm/pull/5585#discussion_r426204036



##########
File path: include/tvm/runtime/container.h
##########
@@ -189,6 +189,759 @@ class InplaceArrayBase {
   }
 };
 
+/*!
+ * \brief iterator adapter that adapts TIter to return another type.
+ * \tparam Converter a struct that contains converting function
+ * \tparam TIter the content iterator type.
+ */
+template <typename Converter, typename TIter>
+class IterAdapter {
+ public:
+  using difference_type = typename std::iterator_traits<TIter>::difference_type;
+  using value_type = typename Converter::ResultType;
+  using pointer = typename Converter::ResultType*;
+  using reference = typename Converter::ResultType&;  // NOLINT(*)
+  using iterator_category = typename std::iterator_traits<TIter>::iterator_category;
+
+  explicit IterAdapter(TIter iter) : iter_(iter) {}
+  IterAdapter& operator++() {
+    ++iter_;
+    return *this;
+  }
+  IterAdapter& operator--() {
+    --iter_;
+    return *this;
+  }
+  IterAdapter& operator++(int) {
+    IterAdapter copy = *this;
+    ++iter_;
+    return copy;
+  }
+  IterAdapter& operator--(int) {
+    IterAdapter copy = *this;
+    --iter_;
+    return copy;
+  }
+
+  IterAdapter operator+(difference_type offset) const { return IterAdapter(iter_ + offset);
}
+
+  template <typename T = IterAdapter>
+  typename std::enable_if<std::is_same<iterator_category, std::random_access_iterator_tag>::value,
+                          typename T::difference_type>::type inline
+  operator-(const IterAdapter& rhs) const {
+    return iter_ - rhs.iter_;
+  }
+
+  bool operator==(IterAdapter other) const { return iter_ == other.iter_; }
+  bool operator!=(IterAdapter other) const { return !(*this == other); }
+  const value_type operator*() const { return Converter::convert(*iter_); }
+
+ private:
+  TIter iter_;
+};
+
+/*!
+ * \brief iterator adapter that adapts TIter to return another type.
+ * \tparam Converter a struct that contains converting function
+ * \tparam TIter the content iterator type.
+ */
+template <typename Converter, typename TIter>
+class ReverseIterAdapter {
+ public:
+  using difference_type = typename std::iterator_traits<TIter>::difference_type;
+  using value_type = typename Converter::ResultType;
+  using pointer = typename Converter::ResultType*;
+  using reference = typename Converter::ResultType&;  // NOLINT(*)
+  using iterator_category = typename std::iterator_traits<TIter>::iterator_category;
+
+  explicit ReverseIterAdapter(TIter iter) : iter_(iter) {}
+  ReverseIterAdapter& operator++() {
+    --iter_;
+    return *this;
+  }
+  ReverseIterAdapter& operator--() {
+    ++iter_;
+    return *this;
+  }
+  ReverseIterAdapter& operator++(int) {
+    ReverseIterAdapter copy = *this;
+    --iter_;
+    return copy;
+  }
+  ReverseIterAdapter& operator--(int) {
+    ReverseIterAdapter copy = *this;
+    ++iter_;
+    return copy;
+  }
+  ReverseIterAdapter operator+(difference_type offset) const {
+    return ReverseIterAdapter(iter_ - offset);
+  }
+
+  template <typename T = ReverseIterAdapter>
+  typename std::enable_if<std::is_same<iterator_category, std::random_access_iterator_tag>::value,
+                          typename T::difference_type>::type inline
+  operator-(const ReverseIterAdapter& rhs) const {
+    return rhs.iter_ - iter_;
+  }
+
+  bool operator==(ReverseIterAdapter other) const { return iter_ == other.iter_; }
+  bool operator!=(ReverseIterAdapter other) const { return !(*this == other); }
+  const value_type operator*() const { return Converter::convert(*iter_); }
+
+ private:
+  TIter iter_;
+};
+
+/*! \brief array node content in array */
+class ArrayNode : public Object, public InplaceArrayBase<ArrayNode, ObjectRef> {
+ public:
+  /*! \return The size of the array */
+  size_t size() const { return this->size_; }
+
+  /*!
+   * \brief Read i-th element from array.
+   * \param i The index
+   * \return the i-th element.
+   */
+  const ObjectRef at(int64_t i) const { return this->operator[](i); }
+
+  /*! \return begin constant iterator */
+  const ObjectRef* begin() const { return static_cast<ObjectRef*>(InplaceArrayBase::AddressOf(0));
}
+
+  /*! \return end constant iterator */
+  const ObjectRef* end() const { return begin() + size_; }
+
+  /*! \brief Release reference to all the elements */
+  void clear() {
+    for (ObjectRef* itr = MutableEnd(); size_; --size_) {
+      (--itr)->ObjectRef::~ObjectRef();
+    }
+  }
+
+  /*!
+   * \brief Set i-th element of the array in-place
+   * \param i The index
+   * \param item The value to be set
+   */
+  void SetItem(int64_t i, ObjectRef item) { this->operator[](i) = std::move(item); }
+
+  /*!
+   * \brief Constructs a container and copy from another
+   * \param cap The capacity of the container
+   * \param from Source of the copy
+   * \return Ref-counted ArrayNode requested
+   */
+  static ObjectPtr<ArrayNode> CopyFrom(int64_t cap, ArrayNode* from) {
+    int64_t size = from->size_;
+    CHECK_GE(cap, size) << "ValueError: not enough capacity";
+    ObjectPtr<ArrayNode> p = ArrayNode::Empty(cap);
+    ObjectRef* write = p->MutableBegin();
+    ObjectRef* read = from->MutableBegin();
+    for (int64_t& i = p->size_ = 0; i < size; ++i) {
+      new (write++) ObjectRef(*read++);
+    }
+    return p;
+  }
+
+  /*!
+   * \brief Constructs a container and move from another
+   * \param cap The capacity of the container
+   * \param from Source of the move
+   * \return Ref-counted ArrayNode requested
+   */
+  static ObjectPtr<ArrayNode> MoveFrom(int64_t cap, ArrayNode* from) {
+    int64_t size = from->size_;
+    CHECK_GE(cap, size) << "ValueError: not enough capacity";
+    ObjectPtr<ArrayNode> p = ArrayNode::Empty(cap);
+    ObjectRef* write = p->MutableBegin();
+    ObjectRef* read = from->MutableBegin();
+    for (int64_t& i = p->size_ = 0; i < size; ++i) {
+      new (write++) ObjectRef(std::move(*read++));
+    }
+    from->size_ = 0;
+    return p;
+  }
+
+  /*!
+   * \brief Constructs a container with n elements. Each element is a copy of val
+   * \param n The size of the container
+   * \param val The init value
+   * \return Ref-counted ArrayNode requested
+   */
+  static ObjectPtr<ArrayNode> CreateRepeated(int64_t n, const ObjectRef& val) {
+    ObjectPtr<ArrayNode> p = ArrayNode::Empty(n);
+    ObjectRef* itr = p->MutableBegin();
+    for (int64_t& i = p->size_ = 0; i < n; ++i) {
+      new (itr++) ObjectRef(val);
+    }
+    return p;
+  }
+
+  static constexpr const uint32_t _type_index = TypeIndex::kRuntimeArray;
+  static constexpr const char* _type_key = "Array";
+  TVM_DECLARE_FINAL_OBJECT_INFO(ArrayNode, Object);
+
+ private:
+  /*! \return Size of initialized memory, used by InplaceArrayBase. */
+  size_t GetSize() const { return this->size_; }
+
+  /*! \return begin mutable iterator */
+  ObjectRef* MutableBegin() const {
+    return static_cast<ObjectRef*>(InplaceArrayBase::AddressOf(0));
+  }
+
+  /*! \return end mutable iterator */
+  ObjectRef* MutableEnd() const { return MutableBegin() + size_; }
+
+  /*!
+   * \brief Create an ArrayNode with the given capacity.
+   * \param n Required capacity
+   * \return Ref-counted ArrayNode requested
+   */
+  static ObjectPtr<ArrayNode> Empty(int64_t n = kInitSize) {
+    CHECK_GE(n, 0);
+    ObjectPtr<ArrayNode> p = make_inplace_array_object<ArrayNode, ObjectRef>(n);
+    p->capacity_ = n;
+    p->size_ = 0;
+    return p;
+  }
+
+  /*!
+   * \brief Assign the elements starting idx from [first, last)
+   * \param idx The starting point
+   * \param first Begin of iterator
+   * \param last End of iterator
+   * \tparam IterType The type of iterator
+   * \return Self
+   */
+  template <typename IterType>
+  ArrayNode* AssignRange(int64_t idx, IterType first, IterType last) {
+    ObjectRef* itr = MutableBegin() + idx;
+    for (; first != last; ++first) {
+      ObjectRef ref = *first;
+      new (itr++) ObjectRef(std::move(ref));
+    }
+    return this;
+  }
+
+  /*!
+   * \brief Move elements from right to left, requires src > dst
+   * \param dst Destination
+   * \param src Source
+   * \param numel Number of elements to be moved
+   * \return Self
+   */
+  ArrayNode* MoveElementsLeft(int64_t dst, int64_t src, int64_t numel) {
+    ObjectRef* from = MutableBegin() + src;
+    ObjectRef* to = MutableBegin() + dst;
+    for (int64_t i = 0; i < numel; ++i) {
+      *to++ = std::move(*from++);
+    }
+    return this;
+  }
+
+  /*!
+   * \brief Move elements from left to rigth, requires src < dst
+   * \param dst Destination
+   * \param src Source
+   * \param numel Number of elements to be moved
+   * \return Self
+   */
+  ArrayNode* MoveElementsRight(int64_t dst, int64_t src, int64_t numel) {
+    ObjectRef* from = MutableBegin() + (src + numel);
+    ObjectRef* to = MutableBegin() + (dst + numel);
+    for (int64_t i = 0; i < numel; ++i) {
+      *--to = std::move(*--from);
+    }
+    return this;
+  }
+
+  /*!
+   * \brief Enlarge the size of the array
+   * \param delta Size enlarged, should be positive
+   * \param val Default value
+   * \return Self
+   */
+  ArrayNode* Enlarge(int64_t delta, const ObjectRef& val = ObjectRef(nullptr)) {
+    ObjectRef* itr = MutableEnd();
+    while (delta-- > 0) {
+      new (itr++) ObjectRef(val);
+      ++size_;
+    }
+    return this;
+  }
+
+  /*!
+   * \brief Shrinks the size of the array
+   * \param delta Size shrinked, should be positive
+   * \return Self
+   */
+  ArrayNode* Shrink(int64_t delta) {

Review comment:
       I think we could do `ShrinkBy` because it avoids some repetitive arithmetics. There
is `std::vector::shrink_to_fit` in STL, which is mostly used for releasing memory in `[size,
capacity)`, and thus I think it serves different purposes thought.




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