ebpfTable.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_EBPF_EBPFTABLE_H_
#define _BACKENDS_EBPF_EBPFTABLE_H_

#include "ebpfObject.h"
#include "ebpfProgram.h"
#include "frontends/p4/methodInstance.h"

namespace EBPF {
// Also used to represent counters
class EBPFTableBase : public EBPFObject {
 public:
    const EBPFProgram* program;

    cstring instanceName;
    cstring keyTypeName;
    cstring valueTypeName;
    cstring dataMapName;
    CodeGenInspector* codeGen;

 protected:
    EBPFTableBase(const EBPFProgram* program, cstring instanceName,
                  CodeGenInspector* codeGen) :
            program(program), instanceName(instanceName), codeGen(codeGen) {
        CHECK_NULL(codeGen); CHECK_NULL(program);
        keyTypeName = program->refMap->newName(instanceName + "_key");
        valueTypeName = program->refMap->newName(instanceName + "_value");
        dataMapName = instanceName;
    }
};

class EBPFTable final : public EBPFTableBase {
 public:
    const IR::Key*            keyGenerator;
    const IR::ActionList*     actionList;
    const IR::TableBlock*    table;
    cstring               defaultActionMapName;
    cstring               actionEnumName;
    std::map<const IR::KeyElement*, cstring> keyFieldNames;
    std::map<const IR::KeyElement*, EBPFType*> keyTypes;

    EBPFTable(const EBPFProgram* program, const IR::TableBlock* table, CodeGenInspector* codeGen);
    void emitTypes(CodeBuilder* builder);
    void emitInstance(CodeBuilder* builder);
    void emitActionArguments(CodeBuilder* builder, const IR::P4Action* action, cstring name);
    void emitKeyType(CodeBuilder* builder);
    void emitValueType(CodeBuilder* builder);
    void emitKey(CodeBuilder* builder, cstring keyName);
    void emitAction(CodeBuilder* builder, cstring valueName);
    void emitInitializer(CodeBuilder* builder);
};

class EBPFCounterTable final : public EBPFTableBase {
    size_t    size;
    bool      isHash;
 public:
    EBPFCounterTable(const EBPFProgram* program, const IR::ExternBlock* block,
                     cstring name, CodeGenInspector* codeGen);
    void emitTypes(CodeBuilder*);
    void emitInstance(CodeBuilder* builder);
    void emitCounterIncrement(CodeBuilder* builder, const IR::MethodCallExpression* expression);
    void emitCounterAdd(CodeBuilder* builder, const IR::MethodCallExpression* expression);
    void emitMethodInvocation(CodeBuilder* builder, const P4::ExternMethod* method);
};

}  // namespace EBPF

#endif /* _BACKENDS_EBPF_EBPFTABLE_H_ */