/
container.h
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/
container.h
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/*!
* \file tvm/runtime/container.h
* \brief Common POD(plain old data) container types.
*/
#ifndef TVM_RUNTIME_CONTAINER_H_
#define TVM_RUNTIME_CONTAINER_H_
#include <dmlc/logging.h>
#include <tvm/runtime/memory.h>
#include <tvm/runtime/object.h>
#include <initializer_list>
#include <type_traits>
#include <utility>
#include <vector>
namespace tvm {
namespace runtime {
/*!
* \brief Base template for classes with array like memory layout.
*
* It provides general methods to access the memory. The memory
* layout is ArrayType + [ElemType]. The alignment of ArrayType
* and ElemType is handled by the memory allocator.
*
* \tparam ArrayType The array header type, contains object specific metadata.
* \tparam ElemType The type of objects stored in the array right after
* ArrayType.
*
* \code
* // Example usage of the template to define a simple array wrapper
* class ArrayObj : public InplaceArrayBase<ArrayObj, Elem> {
* public:
* // Wrap EmplaceInit to initialize the elements
* template <typename Iterator>
* void Init(Iterator begin, Iterator end) {
* size_t num_elems = std::distance(begin, end);
* auto it = begin;
* this->size = 0;
* for (size_t i = 0; i < num_elems; ++i) {
* InplaceArrayBase::EmplaceInit(i, *it++);
* this->size++;
* }
* }
* }
*
* void test_function() {
* vector<Elem> fields;
* auto ptr = make_inplace_array_object<ArrayObj, Elem>(fields.size());
* ptr->Init(fields.begin(), fields.end());
*
* // Access the 0th element in the array.
* assert(ptr->operator[](0) == fields[0]);
* }
*
* \endcode
*/
template <typename ArrayType, typename ElemType>
class InplaceArrayBase {
public:
/*!
* \brief Access element at index
* \param idx The index of the element.
* \return Const reference to ElemType at the index.
*/
const ElemType& operator[](size_t idx) const {
size_t size = Self()->GetSize();
CHECK_LT(idx, size) << "Index " << idx << " out of bounds " << size << "\n";
return *(reinterpret_cast<ElemType*>(AddressOf(idx)));
}
/*!
* \brief Access element at index
* \param idx The index of the element.
* \return Reference to ElemType at the index.
*/
ElemType& operator[](size_t idx) {
size_t size = Self()->GetSize();
CHECK_LT(idx, size) << "Index " << idx << " out of bounds " << size << "\n";
return *(reinterpret_cast<ElemType*>(AddressOf(idx)));
}
/*!
* \brief Destroy the Inplace Array Base object
*/
~InplaceArrayBase() {
if (!(std::is_standard_layout<ElemType>::value &&
std::is_trivial<ElemType>::value)) {
size_t size = Self()->GetSize();
for (size_t i = 0; i < size; ++i) {
ElemType* fp = reinterpret_cast<ElemType*>(AddressOf(i));
fp->ElemType::~ElemType();
}
}
}
protected:
/*!
* \brief Construct a value in place with the arguments.
*
* \tparam Args Type parameters of the arguments.
* \param idx Index of the element.
* \param args Arguments to construct the new value.
*
* \note Please make sure ArrayType::GetSize returns 0 before first call of
* EmplaceInit, and increment GetSize by 1 each time EmplaceInit succeeds.
*/
template <typename... Args>
void EmplaceInit(size_t idx, Args&&... args) {
void* field_ptr = AddressOf(idx);
new (field_ptr) ElemType(std::forward<Args>(args)...);
}
private:
/*!
* \brief Return the self object for the array.
*
* \return Pointer to ArrayType.
*/
inline ArrayType* Self() const {
return static_cast<ArrayType*>(const_cast<InplaceArrayBase*>(this));
}
/*!
* \brief Return the raw pointer to the element at idx.
*
* \param idx The index of the element.
* \return Raw pointer to the element.
*/
void* AddressOf(size_t idx) const {
static_assert(alignof(ArrayType) % alignof(ElemType) == 0 &&
sizeof(ArrayType) % alignof(ElemType) == 0,
"The size and alignment of ArrayType should respect "
"ElemType's alignment.");
size_t kDataStart = sizeof(ArrayType);
ArrayType* self = Self();
char* data_start = reinterpret_cast<char*>(self) + kDataStart;
return data_start + idx * sizeof(ElemType);
}
};
/*! \brief An object representing a structure or enumeration. */
class ADTObj : public Object, public InplaceArrayBase<ADTObj, ObjectRef> {
public:
/*! \brief The tag representing the constructor used. */
uint32_t tag;
/*! \brief Number of fields in the ADT object. */
uint32_t size;
// The fields of the structure follows directly in memory.
static constexpr const uint32_t _type_index = TypeIndex::kVMADT;
static constexpr const char* _type_key = "vm.ADT";
TVM_DECLARE_FINAL_OBJECT_INFO(ADTObj, Object);
private:
/*!
* \return The number of elements in the array.
*/
size_t GetSize() const { return size; }
/*!
* \brief Initialize the elements in the array.
*
* \tparam Iterator Iterator type of the array.
* \param begin The begin iterator.
* \param end The end iterator.
*/
template <typename Iterator>
void Init(Iterator begin, Iterator end) {
size_t num_elems = std::distance(begin, end);
this->size = 0;
auto it = begin;
for (size_t i = 0; i < num_elems; ++i) {
InplaceArrayBase::EmplaceInit(i, *it++);
// Only increment size after the initialization succeeds
this->size++;
}
}
friend class ADT;
friend InplaceArrayBase<ADTObj, ObjectRef>;
};
/*! \brief reference to algebraic data type objects. */
class ADT : public ObjectRef {
public:
/*!
* \brief construct an ADT object reference.
* \param tag The tag of the ADT object.
* \param fields The fields of the ADT object.
* \return The constructed ADT object reference.
*/
ADT(uint32_t tag, std::vector<ObjectRef> fields)
: ADT(tag, fields.begin(), fields.end()){};
/*!
* \brief construct an ADT object reference.
* \param tag The tag of the ADT object.
* \param begin The begin iterator to the start of the fields array.
* \param end The end iterator to the end of the fields array.
* \return The constructed ADT object reference.
*/
template <typename Iterator>
ADT(uint32_t tag, Iterator begin, Iterator end) {
size_t num_elems = std::distance(begin, end);
auto ptr = make_inplace_array_object<ADTObj, ObjectRef>(num_elems);
ptr->tag = tag;
ptr->Init(begin, end);
data_ = std::move(ptr);
}
/*!
* \brief construct an ADT object reference.
* \param tag The tag of the ADT object.
* \param init The initializer list of fields.
* \return The constructed ADT object reference.
*/
ADT(uint32_t tag, std::initializer_list<ObjectRef> init)
: ADT(tag, init.begin(), init.end()){};
/*!
* \brief Access element at index.
*
* \param idx The array index
* \return const ObjectRef
*/
const ObjectRef& operator[](size_t idx) const {
return operator->()->operator[](idx);
}
/*!
* \brief Return the ADT tag.
*/
size_t tag() const { return operator->()->tag; }
/*!
* \brief Return the number of fields.
*/
size_t size() const { return operator->()->size; }
/*!
* \brief Construct a tuple object.
*
* \tparam Args Type params of tuple feilds.
* \param args Tuple fields.
* \return ADT The tuple object reference.
*/
template <typename... Args>
static ADT Tuple(Args&&... args) {
return ADT(0, std::forward<Args>(args)...);
}
TVM_DEFINE_OBJECT_REF_METHODS(ADT, ObjectRef, ADTObj);
};
} // namespace runtime
} // namespace tvm
#endif // TVM_RUNTIME_CONTAINER_H_