chromium/third_party/spirv-tools/src/source/opt/def_use_manager.h

// Copyright (c) 2016 Google Inc.
//
// 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 SOURCE_OPT_DEF_USE_MANAGER_H_
#define SOURCE_OPT_DEF_USE_MANAGER_H_

#include <set>
#include <unordered_map>
#include <vector>

#include "source/opt/instruction.h"
#include "source/opt/module.h"
#include "spirv-tools/libspirv.hpp"

namespace spvtools {
namespace opt {
namespace analysis {

// Definition should never be null. User can be null, however, such an entry
// should be used only for searching (e.g. all users of a particular definition)
// and never stored in a container.
struct UserEntry { … };

inline bool operator==(const UserEntry& lhs, const UserEntry& rhs) { … }

// Orders UserEntry for use in associative containers (i.e. less than ordering).
//
// The definition of an UserEntry is treated as the major key and the users as
// the minor key so that all the users of a particular definition are
// consecutive in a container.
//
// A null user always compares less than a real user. This is done to provide
// easy values to search for the beginning of the users of a particular
// definition (i.e. using {def, nullptr}).
struct UserEntryLess { … };

// A class for analyzing and managing defs and uses in an Module.
class DefUseManager { … };

}  // namespace analysis
}  // namespace opt
}  // namespace spvtools

#endif  // SOURCE_OPT_DEF_USE_MANAGER_H_