EPCDynamicLibrarySearchGenerator.cpp

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//===---------------- EPCDynamicLibrarySearchGenerator.cpp ----------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
 
#include "llvm/ExecutionEngine/Orc/EPCDynamicLibrarySearchGenerator.h"
 
namespace llvm {
namespace orc {
 
Expected<std::unique_ptr<EPCDynamicLibrarySearchGenerator>>
EPCDynamicLibrarySearchGenerator::Load(ExecutionSession &ES,
                                       const char *LibraryPath,
                                       SymbolPredicate Allow) {
  auto Handle = ES.getExecutorProcessControl().loadDylib(LibraryPath);
  if (!Handle)
    return Handle.takeError();
 
  return std::make_unique<EPCDynamicLibrarySearchGenerator>(ES, *Handle,
                                                            std::move(Allow));
}
 
Error EPCDynamicLibrarySearchGenerator::tryToGenerate(
    LookupState &LS, LookupKind K, JITDylib &JD,
    JITDylibLookupFlags JDLookupFlags, const SymbolLookupSet &Symbols) {
 
  if (Symbols.empty())
    return Error::success();
 
  SymbolLookupSet LookupSymbols;
 
  for (auto &KV : Symbols) {
    // Skip symbols that don't match the filter.
    if (Allow && !Allow(KV.first))
      continue;
    LookupSymbols.add(KV.first, SymbolLookupFlags::WeaklyReferencedSymbol);
  }
 
  SymbolMap NewSymbols;
 
  ExecutorProcessControl::LookupRequest Request(H, LookupSymbols);
  auto Result = EPC.lookupSymbols(Request);
  if (!Result)
    return Result.takeError();
 
  assert(Result->size() == 1 && "Results for more than one library returned");
  assert(Result->front().size() == LookupSymbols.size() &&
         "Result has incorrect number of elements");
 
  auto ResultI = Result->front().begin();
  for (auto &KV : LookupSymbols) {
    if (*ResultI)
      NewSymbols[KV.first] = {*ResultI, JITSymbolFlags::Exported};
    ++ResultI;
  }
 
  // If there were no resolved symbols bail out.
  if (NewSymbols.empty())
    return Error::success();
 
  // Define resolved symbols.
  return JD.define(absoluteSymbols(std::move(NewSymbols)));
}
 
} // end namespace orc
} // end namespace llvm