targets/bmv2/expr_stepper.h

/*
 * SPDX-FileCopyrightText: 2022 The P4 Language Consortium
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef BACKENDS_P4TOOLS_MODULES_TESTGEN_TARGETS_BMV2_EXPR_STEPPER_H_
#define BACKENDS_P4TOOLS_MODULES_TESTGEN_TARGETS_BMV2_EXPR_STEPPER_H_
 
#include <cstdint>
#include <string>
 
#include "ir/ir.h"
#include "ir/solver.h"
 
#include "backends/p4tools/modules/testgen/core/program_info.h"
#include "backends/p4tools/modules/testgen/core/small_step/expr_stepper.h"
#include "backends/p4tools/modules/testgen/core/small_step/small_step.h"
#include "backends/p4tools/modules/testgen/lib/execution_state.h"
 
namespace P4::P4Tools::P4Testgen::Bmv2 {
 
class Bmv2V1ModelExprStepper : public ExprStepper {
 protected:
    std::string getClassName() override;
 
 private:
    // Helper function that checks whether the given structure filed has a 'field_list' annotation
    // and the recirculate index matches. @returns true if that is the case.
    static bool isPartOfFieldList(const IR::StructField *field, uint64_t recirculateIndex);

    void resetPreservingFieldList(ExecutionState &nextState, const IR::PathExpression *ref,
                                  uint64_t recirculateIndex) const;

    void processClone(const ExecutionState &state, SmallStepEvaluator::Result &result);

    void processRecirculate(const ExecutionState &state, SmallStepEvaluator::Result &result);
 
    // using MethodImpl = std::function<void(const ExternInfo &, Bmv2V1ModelExprStepper &stepper)>;
    // Provides implementations of BMv2 externs.
    static const Bmv2V1ModelExprStepper::ExternMethodImpls<Bmv2V1ModelExprStepper>::MethodImpl
        ASSERT_ASSUME_EXECUTE;
    static const ExternMethodImpls<Bmv2V1ModelExprStepper> BMV2_EXTERN_METHOD_IMPLS;
 
 public:
    Bmv2V1ModelExprStepper(ExecutionState &state, AbstractSolver &solver,
                           const ProgramInfo &programInfo);
 
    void evalExternMethodCall(const ExternInfo &externInfo) override;
 
    bool preorder(const IR::P4Table * /*table*/) override;
};
}  // namespace P4::P4Tools::P4Testgen::Bmv2
 
#endif /* BACKENDS_P4TOOLS_MODULES_TESTGEN_TARGETS_BMV2_EXPR_STEPPER_H_ */