redundantParsers.h

/*
Copyright 2022 Intel Corporation
 
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_REDUNDANTPARSERS_H_
#define FRONTENDS_P4_REDUNDANTPARSERS_H_
 
#include "frontends/common/resolveReferences/resolveReferences.h"
#include "frontends/p4/typeChecking/typeChecker.h"
#include "frontends/p4/unusedDeclarations.h"
#include "ir/ir.h"
 
namespace P4 {

class FindRedundantParsers : public Inspector {
    std::set<const IR::P4Parser *> &redundantParsers;
    bool preorder(const IR::P4Parser *parser) override;
 
 public:
    explicit FindRedundantParsers(std::set<const IR::P4Parser *> &redundantParsers)
        : redundantParsers(redundantParsers) {}
};

class EliminateSubparserCalls : public Transform, public ResolutionContext {
    const std::set<const IR::P4Parser *> &redundantParsers;
    TypeMap *typeMap;
    const IR::Node *postorder(IR::MethodCallStatement *methodCallStmt) override;
 
 public:
    EliminateSubparserCalls(const std::set<const IR::P4Parser *> &redundantParsers,
                            TypeMap *typeMap)
        : redundantParsers(redundantParsers), typeMap(typeMap) {}
};
 
class RemoveRedundantParsers : public PassManager {
    std::set<const IR::P4Parser *> redundantParsers;
 
 public:
    RemoveRedundantParsers(TypeMap *typeMap, const RemoveUnusedPolicy &policy)
        : PassManager{new TypeChecking(nullptr, typeMap, true),
                      new FindRedundantParsers(redundantParsers),
                      new EliminateSubparserCalls(redundantParsers, typeMap),
                      new RemoveAllUnusedDeclarations(policy)} {
        setName("RemoveRedundantParsers");
    }
};
 
}  // namespace P4
 
#endif /* FRONTENDS_P4_REDUNDANTPARSERS_H_ */