eliminateSwitch.h

/*
Copyright 2020 VMware, 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 MIDEND_ELIMINATESWITCH_H_
#define MIDEND_ELIMINATESWITCH_H_
 
#include "frontends/p4/typeChecking/typeChecker.h"
#include "ir/ir.h"
 
namespace P4 {

class DoEliminateSwitch final : public Transform {
    MinimalNameGenerator nameGen;
    const TypeMap *typeMap;
    std::vector<const IR::Declaration *> toInsert;
 
 public:
    bool exactNeeded = false;
 
    explicit DoEliminateSwitch(const TypeMap *typeMap) : typeMap(typeMap) {
        setName("DoEliminateSwitch");
        CHECK_NULL(typeMap);
    }
 
    Visitor::profile_t init_apply(const IR::Node *node) override {
        auto rv = Transform::init_apply(node);
        node->apply(nameGen);
 
        return rv;
    }
 
    const IR::Node *postorder(IR::SwitchStatement *statement) override;
    const IR::Node *postorder(IR::P4Control *control) override;
    const IR::Node *postorder(IR::P4Program *program) override;
};
 
class EliminateSwitch final : public PassManager {
 public:
    EliminateSwitch(TypeMap *typeMap, TypeChecking *typeChecking = nullptr) {
        if (!typeChecking) typeChecking = new TypeChecking(nullptr, typeMap);
        passes.push_back(typeChecking);
        passes.push_back(new DoEliminateSwitch(typeMap));
        passes.push_back(new ClearTypeMap(typeMap));
        setName("EliminateSwitch");
    }
};
 
}  // namespace P4
 
#endif /* MIDEND_ELIMINATESWITCH_H_ */