simplify.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_SIMPLIFY_H_
#define FRONTENDS_P4_SIMPLIFY_H_
 
#include "frontends/common/resolveReferences/resolveReferences.h"
#include "frontends/p4/methodInstance.h"
#include "frontends/p4/typeChecking/typeChecker.h"
#include "ir/ir.h"
 
namespace P4 {

class DoSimplifyControlFlow : public Transform, public ResolutionContext {
    TypeMap *typeMap;
    bool foldInlinedFrom;
 
 public:
    explicit DoSimplifyControlFlow(TypeMap *typeMap, bool foldInlinedFrom)
        : typeMap(typeMap), foldInlinedFrom(foldInlinedFrom) {
        CHECK_NULL(typeMap);
        setName("DoSimplifyControlFlow");
        // We may want to replace the same statement with different things
        // in different places.
        visitDagOnce = false;
    }
    const IR::Node *postorder(IR::BlockStatement *statement) override;
    const IR::Node *postorder(IR::IfStatement *statement) override;
    const IR::Node *postorder(IR::EmptyStatement *statement) override;
    const IR::Node *postorder(IR::SwitchStatement *statement) override;
};

class SimplifyControlFlow : public PassRepeated {
 public:
    explicit SimplifyControlFlow(TypeMap *typeMap, bool foldInlinedFrom,
                                 TypeChecking *typeChecking = nullptr) {
        if (!typeChecking) typeChecking = new TypeChecking(nullptr, typeMap);
        passes.push_back(typeChecking);
        passes.push_back(new DoSimplifyControlFlow(typeMap, foldInlinedFrom));
        setName("SimplifyControlFlow");
    }
};
 
}  // namespace P4
 
#endif /* FRONTENDS_P4_SIMPLIFY_H_ */