105 lines
3.6 KiB
C++
105 lines
3.6 KiB
C++
/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
|
|
|
|
Licensed 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.
|
|
==============================================================================*/
|
|
|
|
// Casting utility functions for HLO instructions.
|
|
|
|
#ifndef TENSORFLOW_COMPILER_XLA_SERVICE_HLO_CASTING_UTILS_H_
|
|
#define TENSORFLOW_COMPILER_XLA_SERVICE_HLO_CASTING_UTILS_H_
|
|
|
|
#include <type_traits>
|
|
#include "tensorflow/core/platform/logging.h"
|
|
|
|
namespace xla {
|
|
|
|
class HloInstruction;
|
|
|
|
template <class T>
|
|
using EnableIfDerivedFromHlo =
|
|
typename std::enable_if<std::is_base_of<HloInstruction, T>::value>::type;
|
|
|
|
// TODO(b/93238915): Switch implementation from C++'s dynamic_cast to LLVM-like
|
|
// RTTI if it turns out to be a performance issue.
|
|
// Casts an HloInstruction pointer to one of its subclasses, dies if argument is
|
|
// nullptr or runtime information does not match.
|
|
//
|
|
// Similar to LLVM's cast.
|
|
template <class T, EnableIfDerivedFromHlo<T>* = nullptr>
|
|
const T* Cast(const HloInstruction* instruction) {
|
|
CHECK(instruction != nullptr);
|
|
const T* casted = dynamic_cast<const T*>(instruction);
|
|
CHECK(casted != nullptr);
|
|
return casted;
|
|
}
|
|
|
|
// Non-const overload of Cast.
|
|
template <class T, EnableIfDerivedFromHlo<T>* = nullptr>
|
|
T* Cast(HloInstruction* instruction) {
|
|
return const_cast<T*>(
|
|
Cast<T>(const_cast<const HloInstruction*>(instruction)));
|
|
}
|
|
|
|
// Works just like the Cast, except that it allows for a null pointer as an
|
|
// argument which it then propagates.
|
|
//
|
|
// Similar to LLVM's cast_or_null.
|
|
template <class T, EnableIfDerivedFromHlo<T>* = nullptr>
|
|
const T* CastOrNull(const HloInstruction* instruction) {
|
|
return instruction != nullptr ? Cast<T>(instruction) : nullptr;
|
|
}
|
|
|
|
// Non-const overload of CastOrNull.
|
|
template <class T, EnableIfDerivedFromHlo<T>* = nullptr>
|
|
T* CastOrNull(HloInstruction* instruction) {
|
|
return const_cast<T*>(
|
|
CastOrNull<T>(const_cast<const HloInstruction*>(instruction)));
|
|
}
|
|
|
|
// Casts an HloInstruction pointer to one of its subclasses, dies if argument is
|
|
// nullptr, returns nullptr if runtime information does not match.
|
|
//
|
|
// Similar to LLVM's dyn_cast.
|
|
template <class T, EnableIfDerivedFromHlo<T>* = nullptr>
|
|
const T* DynCast(const HloInstruction* instruction) {
|
|
CHECK(instruction != nullptr);
|
|
return dynamic_cast<const T*>(instruction);
|
|
}
|
|
|
|
// Non-const overload of DynCast.
|
|
template <class T, EnableIfDerivedFromHlo<T>* = nullptr>
|
|
T* DynCast(HloInstruction* instruction) {
|
|
return const_cast<T*>(
|
|
DynCast<T>(const_cast<const HloInstruction*>(instruction)));
|
|
}
|
|
|
|
// Works just like the DynCast, except that it allows for a null pointer as an
|
|
// argument which it then propagates.
|
|
//
|
|
// Similar to LLVM's dyn_cast_or_null.
|
|
template <class T, EnableIfDerivedFromHlo<T>* = nullptr>
|
|
const T* DynCastOrNull(const HloInstruction* instruction) {
|
|
return instruction != nullptr ? DynCast<T>(instruction) : nullptr;
|
|
}
|
|
|
|
// Non-const overload of DynCastOrNull.
|
|
template <class T, EnableIfDerivedFromHlo<T>* = nullptr>
|
|
T* DynCastOrNull(HloInstruction* instruction) {
|
|
return const_cast<T*>(
|
|
DynCastOrNull<T>(const_cast<const HloInstruction*>(instruction)));
|
|
}
|
|
|
|
} // namespace xla
|
|
|
|
#endif // TENSORFLOW_COMPILER_XLA_SERVICE_HLO_CASTING_UTILS_H_
|