ExecutorProcessControl.cpp

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//===---- ExecutorProcessControl.cpp -- Executor process control APIs -----===//
//
// 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/ExecutorProcessControl.h"
 
#include "llvm/ExecutionEngine/Orc/Core.h"
#include "llvm/ExecutionEngine/Orc/TargetProcess/TargetExecutionUtils.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/Process.h"
 
#define DEBUG_TYPE "orc"
 
namespace llvm {
namespace orc {
 
ExecutorProcessControl::MemoryAccess::~MemoryAccess() {}
 
ExecutorProcessControl::~ExecutorProcessControl() {}
 
SelfExecutorProcessControl::SelfExecutorProcessControl(
    std::shared_ptr<SymbolStringPool> SSP, Triple TargetTriple,
    unsigned PageSize, std::unique_ptr<jitlink::JITLinkMemoryManager> MemMgr)
    : ExecutorProcessControl(std::move(SSP)) {
 
  OwnedMemMgr = std::move(MemMgr);
  if (!OwnedMemMgr)
    OwnedMemMgr = std::make_unique<jitlink::InProcessMemoryManager>();
 
  this->TargetTriple = std::move(TargetTriple);
  this->PageSize = PageSize;
  this->MemMgr = OwnedMemMgr.get();
  this->MemAccess = this;
  this->JDI = {ExecutorAddr::fromPtr(jitDispatchViaWrapperFunctionManager),
               ExecutorAddr::fromPtr(this)};
  if (this->TargetTriple.isOSBinFormatMachO())
    GlobalManglingPrefix = '_';
}
 
Expected<std::unique_ptr<SelfExecutorProcessControl>>
SelfExecutorProcessControl::Create(
    std::shared_ptr<SymbolStringPool> SSP,
    std::unique_ptr<jitlink::JITLinkMemoryManager> MemMgr) {
 
  if (!SSP)
    SSP = std::make_shared<SymbolStringPool>();
 
  auto PageSize = sys::Process::getPageSize();
  if (!PageSize)
    return PageSize.takeError();
 
  Triple TT(sys::getProcessTriple());
 
  return std::make_unique<SelfExecutorProcessControl>(
      std::move(SSP), std::move(TT), *PageSize, std::move(MemMgr));
}
 
Expected<tpctypes::DylibHandle>
SelfExecutorProcessControl::loadDylib(const char *DylibPath) {
  std::string ErrMsg;
  auto Dylib = std::make_unique<sys::DynamicLibrary>(
      sys::DynamicLibrary::getPermanentLibrary(DylibPath, &ErrMsg));
  if (!Dylib->isValid())
    return make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode());
  DynamicLibraries.push_back(std::move(Dylib));
  return pointerToJITTargetAddress(DynamicLibraries.back().get());
}
 
Expected<std::vector<tpctypes::LookupResult>>
SelfExecutorProcessControl::lookupSymbols(ArrayRef<LookupRequest> Request) {
  std::vector<tpctypes::LookupResult> R;
 
  for (auto &Elem : Request) {
    auto *Dylib = jitTargetAddressToPointer<sys::DynamicLibrary *>(Elem.Handle);
    assert(llvm::any_of(DynamicLibraries,
                        [=](const std::unique_ptr<sys::DynamicLibrary> &DL) {
                          return DL.get() == Dylib;
                        }) &&
           "Invalid handle");
 
    R.push_back(std::vector<JITTargetAddress>());
    for (auto &KV : Elem.Symbols) {
      auto &Sym = KV.first;
      std::string Tmp((*Sym).data() + !!GlobalManglingPrefix,
                      (*Sym).size() - !!GlobalManglingPrefix);
      void *Addr = Dylib->getAddressOfSymbol(Tmp.c_str());
      if (!Addr && KV.second == SymbolLookupFlags::RequiredSymbol) {
        // FIXME: Collect all failing symbols before erroring out.
        SymbolNameVector MissingSymbols;
        MissingSymbols.push_back(Sym);
        return make_error<SymbolsNotFound>(SSP, std::move(MissingSymbols));
      }
      R.back().push_back(pointerToJITTargetAddress(Addr));
    }
  }
 
  return R;
}
 
Expected<int32_t>
SelfExecutorProcessControl::runAsMain(ExecutorAddr MainFnAddr,
                                      ArrayRef<std::string> Args) {
  using MainTy = int (*)(int, char *[]);
  return orc::runAsMain(MainFnAddr.toPtr<MainTy>(), Args);
}
 
void SelfExecutorProcessControl::callWrapperAsync(SendResultFunction SendResult,
                                                  ExecutorAddr WrapperFnAddr,
                                                  ArrayRef<char> ArgBuffer) {
  using WrapperFnTy =
      shared::detail::CWrapperFunctionResult (*)(const char *Data, size_t Size);
  auto *WrapperFn = WrapperFnAddr.toPtr<WrapperFnTy>();
  SendResult(WrapperFn(ArgBuffer.data(), ArgBuffer.size()));
}
 
Error SelfExecutorProcessControl::disconnect() { return Error::success(); }
 
void SelfExecutorProcessControl::writeUInt8sAsync(
    ArrayRef<tpctypes::UInt8Write> Ws, WriteResultFn OnWriteComplete) {
  for (auto &W : Ws)
    *jitTargetAddressToPointer<uint8_t *>(W.Address) = W.Value;
  OnWriteComplete(Error::success());
}
 
void SelfExecutorProcessControl::writeUInt16sAsync(
    ArrayRef<tpctypes::UInt16Write> Ws, WriteResultFn OnWriteComplete) {
  for (auto &W : Ws)
    *jitTargetAddressToPointer<uint16_t *>(W.Address) = W.Value;
  OnWriteComplete(Error::success());
}
 
void SelfExecutorProcessControl::writeUInt32sAsync(
    ArrayRef<tpctypes::UInt32Write> Ws, WriteResultFn OnWriteComplete) {
  for (auto &W : Ws)
    *jitTargetAddressToPointer<uint32_t *>(W.Address) = W.Value;
  OnWriteComplete(Error::success());
}
 
void SelfExecutorProcessControl::writeUInt64sAsync(
    ArrayRef<tpctypes::UInt64Write> Ws, WriteResultFn OnWriteComplete) {
  for (auto &W : Ws)
    *jitTargetAddressToPointer<uint64_t *>(W.Address) = W.Value;
  OnWriteComplete(Error::success());
}
 
void SelfExecutorProcessControl::writeBuffersAsync(
    ArrayRef<tpctypes::BufferWrite> Ws, WriteResultFn OnWriteComplete) {
  for (auto &W : Ws)
    memcpy(jitTargetAddressToPointer<char *>(W.Address), W.Buffer.data(),
           W.Buffer.size());
  OnWriteComplete(Error::success());
}
 
shared::detail::CWrapperFunctionResult
SelfExecutorProcessControl::jitDispatchViaWrapperFunctionManager(
    void *Ctx, const void *FnTag, const char *Data, size_t Size) {
 
  LLVM_DEBUG({
    dbgs() << "jit-dispatch call with tag " << FnTag << " and " << Size
           << " byte payload.\n";
  });
 
  std::promise<shared::WrapperFunctionResult> ResultP;
  auto ResultF = ResultP.get_future();
  static_cast<SelfExecutorProcessControl *>(Ctx)
      ->getExecutionSession()
      .runJITDispatchHandler(
          [ResultP = std::move(ResultP)](
              shared::WrapperFunctionResult Result) mutable {
            ResultP.set_value(std::move(Result));
          },
          pointerToJITTargetAddress(FnTag), {Data, Size});
 
  return ResultF.get().release();
}
 
} // end namespace orc
} // end namespace llvm