EPCGenericDylibManager.h

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//===- EPCGenericDylibManager.h -- Generic EPC Dylib management -*- 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
//
//===----------------------------------------------------------------------===//
//
// Implements dylib loading and searching by making calls to
// ExecutorProcessControl::callWrapper.
//
// This simplifies the implementaton of new ExecutorProcessControl instances,
// as this implementation will always work (at the cost of some performance
// overhead for the calls).
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_EXECUTIONENGINE_ORC_EPCGENERICDYLIBMANAGER_H
#define LLVM_EXECUTIONENGINE_ORC_EPCGENERICDYLIBMANAGER_H
 
#include "llvm/ExecutionEngine/Orc/DylibManager.h"
#include "llvm/ExecutionEngine/Orc/ExecutorProcessControl.h"
#include "llvm/ExecutionEngine/Orc/Shared/ExecutorSymbolDef.h"
#include "llvm/ExecutionEngine/Orc/Shared/SimpleRemoteEPCUtils.h"
#include "llvm/Support/Compiler.h"
 
namespace llvm {
namespace orc {
 
class SymbolLookupSet;
 
class EPCGenericDylibManager : public DylibManager {
public:
  /// Function addresses for memory access.
  struct SymbolAddrs {
    ExecutorAddr Instance;
    ExecutorAddr Open;
    ExecutorAddr Resolve;
  };
 
  /// Create an EPCGenericMemoryAccess instance from a given set of
  /// function addrs.
  LLVM_ABI static Expected<EPCGenericDylibManager>
  CreateWithDefaultBootstrapSymbols(ExecutorProcessControl &EPC);
 
  /// Create an EPCGenericMemoryAccess instance from a given set of
  /// function addrs.
  EPCGenericDylibManager(ExecutorProcessControl &EPC, SymbolAddrs SAs)
      : EPC(EPC), SAs(SAs) {}
 
  /// Loads the dylib with the given name.
  LLVM_ABI Expected<tpctypes::DylibHandle> open(StringRef Path, uint64_t Mode);
 
  /// Looks up symbols within the given dylib.
  Expected<tpctypes::LookupResult> lookup(tpctypes::DylibHandle H,
                                          const SymbolLookupSet &Lookup) {
    std::promise<MSVCPExpected<tpctypes::LookupResult>> RP;
    auto RF = RP.get_future();
    lookupAsync(H, Lookup, [&RP](auto R) { RP.set_value(std::move(R)); });
    return RF.get();
  }
 
  /// Looks up symbols within the given dylib.
  Expected<tpctypes::LookupResult> lookup(tpctypes::DylibHandle H,
                                          const RemoteSymbolLookupSet &Lookup) {
    std::promise<MSVCPExpected<tpctypes::LookupResult>> RP;
    auto RF = RP.get_future();
    lookupAsync(H, Lookup, [&RP](auto R) { RP.set_value(std::move(R)); });
    return RF.get();
  }
 
  using SymbolLookupCompleteFn =
      unique_function<void(Expected<tpctypes::LookupResult>)>;
 
  /// Looks up symbols within the given dylib.
  LLVM_ABI void lookupAsync(tpctypes::DylibHandle H,
                            const SymbolLookupSet &Lookup,
                            SymbolLookupCompleteFn Complete);
 
  /// Looks up symbols within the given dylib.
  LLVM_ABI void lookupAsync(tpctypes::DylibHandle H,
                            const RemoteSymbolLookupSet &Lookup,
                            SymbolLookupCompleteFn Complete);
 
  /// Load the dynamic library at the given path and return a handle to it.
  /// If DylibPath is null this function will return the global handle for
  /// the target process.
  LLVM_ABI Expected<tpctypes::DylibHandle>
  loadDylib(const char *DylibPath) override;
 
  /// Search for symbols in the target process.
  LLVM_ABI void
  lookupSymbolsAsync(ArrayRef<DylibManager::LookupRequest> Request,
                     DylibManager::SymbolLookupCompleteFn Complete) override;
 
private:
  ExecutorProcessControl &EPC;
  SymbolAddrs SAs;
};
 
} // end namespace orc
} // end namespace llvm
 
#endif // LLVM_EXECUTIONENGINE_ORC_EPCGENERICDYLIBMANAGER_H