moveConstructors.h

/*
Copyright 2013-present Barefoot Networks, 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 FRONTENDS_P4_MOVECONSTRUCTORS_H_
#define FRONTENDS_P4_MOVECONSTRUCTORS_H_
 
#include "frontends/common/resolveReferences/referenceMap.h"
#include "ir/ir.h"
#include "ir/visitor.h"
#include "lib/ordered_map.h"
 
namespace P4 {
 
class MoveConstructors : public Transform {
    struct ConstructorMap {
        // Maps a constructor to the temporary used to hold its value.
        ordered_map<const IR::ConstructorCallExpression *, cstring> tmpName;
 
        void clear() { tmpName.clear(); }
        void add(const IR::ConstructorCallExpression *expression, cstring name) {
            CHECK_NULL(expression);
            tmpName[expression] = name;
        }
        bool empty() const { return tmpName.empty(); }
    };
 
    enum class Region { InParserStateful, InControlStateful, InBody, Outside };
 
    MinimalNameGenerator nameGen;
    ConstructorMap cmap;
    Region convert;
 
 public:
    MoveConstructors();
 
    profile_t init_apply(const IR::Node *node) override;
    const IR::Node *preorder(IR::P4Parser *parser) override;
    const IR::Node *preorder(IR::IndexedVector<IR::Declaration> *declarations) override;
    const IR::Node *postorder(IR::P4Parser *parser) override;
    const IR::Node *preorder(IR::P4Control *control) override;
    const IR::Node *postorder(IR::P4Control *control) override;
    const IR::Node *preorder(IR::P4Table *table) override;
    const IR::Node *postorder(IR::ConstructorCallExpression *expression) override;
};
 
}  // namespace P4
 
#endif /* FRONTENDS_P4_MOVECONSTRUCTORS_H_ */