controls.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 BACKENDS_GRAPHS_CONTROLS_H_
#define BACKENDS_GRAPHS_CONTROLS_H_
 
#include "graphs.h"
 
namespace graphs {
 
class ControlGraphs : public Graphs {
 public:
    class ControlStack {
     public:
        Graph *pushBack(Graph &currentSubgraph, const cstring &name);
        Graph *popBack();
        Graph *getSubgraph() const;
        cstring getName(const cstring &name) const;
        bool isEmpty() const;
 
     private:
        std::vector<cstring> names{};
        std::vector<Graph *> subgraphs{};
    };
 
    ControlGraphs(P4::ReferenceMap *refMap, P4::TypeMap *typeMap, const cstring &graphsDir);
 
    bool preorder(const IR::PackageBlock *block) override;
    bool preorder(const IR::ControlBlock *block) override;
    bool preorder(const IR::P4Control *cont) override;
    bool preorder(const IR::BlockStatement *statement) override;
    bool preorder(const IR::IfStatement *statement) override;
    bool preorder(const IR::SwitchStatement *statement) override;
    bool preorder(const IR::MethodCallStatement *statement) override;
    bool preorder(const IR::AssignmentStatement *statement) override;
    bool preorder(const IR::ReturnStatement *) override;
    bool preorder(const IR::ExitStatement *) override;
    bool preorder(const IR::P4Table *table) override;
    bool preorder(const IR::Key *key) override;
    bool preorder(const IR::P4Action *action) override;
 
    std::vector<Graph *> controlGraphsArray{};
 
 private:
    P4::ReferenceMap *refMap;
    P4::TypeMap *typeMap;
    const cstring graphsDir;
    Parents return_parents{};
    // we keep a stack of subgraphs; every time we visit a control, we create a
    // new subgraph and push it to the stack; this new graph becomes the
    // "current graph" to which we add vertices (e.g. tables).
    ControlStack controlStack{};
    std::optional<cstring> instanceName{};
};
 
}  // namespace graphs
 
#endif /* BACKENDS_GRAPHS_CONTROLS_H_ */