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// Copyright 2022 The Tint Authors.
//
// 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.
#ifndef SRC_TINT_TYPE_MANAGER_H_
#define SRC_TINT_TYPE_MANAGER_H_
#include <utility>
#include "src/tint/type/type.h"
#include "src/tint/utils/hash.h"
#include "src/tint/utils/unique_allocator.h"
namespace tint::type {
/// The type manager holds all the pointers to the known types.
class Manager final {
public:
/// Iterator is the type returned by begin() and end()
using TypeIterator = utils::BlockAllocator<Type>::ConstIterator;
/// Constructor
Manager();
/// Move constructor
Manager(Manager&&);
/// Move assignment operator
/// @param rhs the Manager to move
/// @return this Manager
Manager& operator=(Manager&& rhs);
/// Destructor
~Manager();
/// Wrap returns a new Manager created with the types of `inner`.
/// The Manager returned by Wrap is intended to temporarily extend the types
/// of an existing immutable Manager.
/// As the copied types are owned by `inner`, `inner` must not be destructed
/// or assigned while using the returned Manager.
/// TODO(bclayton) - Evaluate whether there are safer alternatives to this
/// function. See crbug.com/tint/460.
/// @param inner the immutable Manager to extend
/// @return the Manager that wraps `inner`
static Manager Wrap(const Manager& inner) {
Manager out;
out.types_.Wrap(inner.types_);
out.unique_nodes_.Wrap(inner.unique_nodes_);
return out;
}
/// @param args the arguments used to construct the type, unique node or node.
/// @return a pointer to an instance of `T` with the provided arguments.
/// If NODE derives from UniqueNode and an existing instance of `T` has been
/// constructed, then the same pointer is returned.
template <typename NODE, typename... ARGS>
NODE* Get(ARGS&&... args) {
if constexpr (traits::IsTypeOrDerived<NODE, Type>) {
return types_.Get<NODE>(std::forward<ARGS>(args)...);
} else if constexpr (traits::IsTypeOrDerived<NODE, UniqueNode>) {
return unique_nodes_.Get<NODE>(std::forward<ARGS>(args)...);
} else {
return nodes_.Create<NODE>(std::forward<ARGS>(args)...);
}
}
/// @param args the arguments used to create the temporary used for the search.
/// @return a pointer to an instance of `T` with the provided arguments, or nullptr if the item
/// was not found.
template <typename TYPE,
typename _ = std::enable_if<traits::IsTypeOrDerived<TYPE, Type>>,
typename... ARGS>
TYPE* Find(ARGS&&... args) const {
return types_.Find<TYPE>(std::forward<ARGS>(args)...);
}
/// @returns an iterator to the beginning of the types
TypeIterator begin() const { return types_.begin(); }
/// @returns an iterator to the end of the types
TypeIterator end() const { return types_.end(); }
private:
/// Unique types owned by the manager
utils::UniqueAllocator<Type> types_;
/// Unique nodes (excluding types) owned by the manager
utils::UniqueAllocator<UniqueNode> unique_nodes_;
/// Non-unique nodes owned by the manager
utils::BlockAllocator<Node> nodes_;
};
} // namespace tint::type
#endif // SRC_TINT_TYPE_MANAGER_H_