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//===-- EPCEHFrameRegistrar.h - EPC based eh-frame registration -*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

// ExecutorProcessControl based eh-frame registration.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_EXECUTIONENGINE_ORC_EPCEHFRAMEREGISTRAR_H

#define LLVM_EXECUTIONENGINE_ORC_EPCEHFRAMEREGISTRAR_H

#include "llvm/ExecutionEngine/JITLink/EHFrameSupport.h"

#include "llvm/ExecutionEngine/Orc/Shared/ExecutorAddress.h"

namespace llvm {

namespace orc {

class ExecutionSession;

/// Register/Deregisters EH frames in a remote process via a

/// ExecutorProcessControl instance.

class EPCEHFrameRegistrar : public jitlink::EHFrameRegistrar {

public:

  /// Create from a ExecutorProcessControl instance alone. This will use

  /// the EPC's lookupSymbols method to find the registration/deregistration

  /// funciton addresses by name.

  ///

  /// If RegistrationFunctionsDylib is non-None then it will be searched to

  /// find the registration functions. If it is None then the process dylib

  /// will be loaded to find the registration functions.

  static Expected<std::unique_ptr<EPCEHFrameRegistrar>>

  Create(ExecutionSession &ES,

         std::optional<ExecutorAddr> RegistrationFunctionsDylib = std::nullopt);

  /// Create a EPCEHFrameRegistrar with the given ExecutorProcessControl

  /// object and registration/deregistration function addresses.

  EPCEHFrameRegistrar(ExecutionSession &ES,

                      ExecutorAddr RegisterEHFrameWrapperFnAddr,

                      ExecutorAddr DeregisterEHFRameWrapperFnAddr)

      : ES(ES), RegisterEHFrameWrapperFnAddr(RegisterEHFrameWrapperFnAddr),

        DeregisterEHFrameWrapperFnAddr(DeregisterEHFRameWrapperFnAddr) {}

  Error registerEHFrames(ExecutorAddrRange EHFrameSection) override;

  Error deregisterEHFrames(ExecutorAddrRange EHFrameSection) override;

private:

  ExecutionSession &ES;

  ExecutorAddr RegisterEHFrameWrapperFnAddr;

  ExecutorAddr DeregisterEHFrameWrapperFnAddr;

};

} // end namespace orc

} // end namespace llvm

#endif // LLVM_EXECUTIONENGINE_ORC_EPCEHFRAMEREGISTRAR_H