C++ Status::SetErrorToGenericError方法代码示例

void IRMemoryMap::WriteScalarToMemory(lldb::addr_t process_address,
                                      Scalar &scalar, size_t size,
                                      Status &error) {
  error.Clear();

  if (size == UINT32_MAX)
    size = scalar.GetByteSize();

  if (size > 0) {
    uint8_t buf[32];
    const size_t mem_size =
        scalar.GetAsMemoryData(buf, size, GetByteOrder(), error);
    if (mem_size > 0) {
      return WriteMemory(process_address, buf, mem_size, error);
    } else {
      error.SetErrorToGenericError();
      error.SetErrorString(
          "Couldn't write scalar: failed to get scalar as memory data");
    }
  } else {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't write scalar: its size was zero");
  }
  return;
}

Materializer::DematerializerSP
Materializer::Materialize(lldb::StackFrameSP &frame_sp, IRMemoryMap &map,
                          lldb::addr_t process_address, Status &error) {
  ExecutionContextScope *exe_scope = frame_sp.get();

  if (!exe_scope)
    exe_scope = map.GetBestExecutionContextScope();

  DematerializerSP dematerializer_sp = m_dematerializer_wp.lock();

  if (dematerializer_sp) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't materialize: already materialized");
  }

  DematerializerSP ret(
      new Dematerializer(*this, frame_sp, map, process_address));

  if (!exe_scope) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't materialize: target doesn't exist");
  }

  for (EntityUP &entity_up : m_entities) {
    entity_up->Materialize(frame_sp, map, process_address, error);

    if (!error.Success())
      return DematerializerSP();
  }

  if (Log *log =
          lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)) {
    log->Printf(
        "Materializer::Materialize (frame_sp = %p, process_address = 0x%" PRIx64
        ") materialized:",
        static_cast<void *>(frame_sp.get()), process_address);
    for (EntityUP &entity_up : m_entities)
      entity_up->DumpToLog(map, process_address, log);
  }

  m_dematerializer_wp = ret;

  return ret;
}

void IRMemoryMap::ReadScalarFromMemory(Scalar &scalar,
                                       lldb::addr_t process_address,
                                       size_t size, Status &error) {
  error.Clear();

  if (size > 0) {
    DataBufferHeap buf(size, 0);
    ReadMemory(buf.GetBytes(), process_address, size, error);

    if (!error.Success())
      return;

    DataExtractor extractor(buf.GetBytes(), buf.GetByteSize(), GetByteOrder(),
                            GetAddressByteSize());

    lldb::offset_t offset = 0;

    switch (size) {
    default:
      error.SetErrorToGenericError();
      error.SetErrorStringWithFormat(
          "Couldn't read scalar: unsupported size %" PRIu64, (uint64_t)size);
      return;
    case 1:
      scalar = extractor.GetU8(&offset);
      break;
    case 2:
      scalar = extractor.GetU16(&offset);
      break;
    case 4:
      scalar = extractor.GetU32(&offset);
      break;
    case 8:
      scalar = extractor.GetU64(&offset);
      break;
    }
  } else {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't read scalar: its size was zero");
  }
  return;
}

void Materializer::Dematerializer::Dematerialize(Status &error,
                                                 lldb::addr_t frame_bottom,
                                                 lldb::addr_t frame_top) {
  lldb::StackFrameSP frame_sp;

  lldb::ThreadSP thread_sp = m_thread_wp.lock();
  if (thread_sp)
    frame_sp = thread_sp->GetFrameWithStackID(m_stack_id);

  ExecutionContextScope *exe_scope = m_map->GetBestExecutionContextScope();

  if (!IsValid()) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't dematerialize: invalid dematerializer");
  }

  if (!exe_scope) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't dematerialize: target is gone");
  } else {
    if (Log *log =
            lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)) {
      log->Printf("Materializer::Dematerialize (frame_sp = %p, process_address "
                  "= 0x%" PRIx64 ") about to dematerialize:",
                  static_cast<void *>(frame_sp.get()), m_process_address);
      for (EntityUP &entity_up : m_materializer->m_entities)
        entity_up->DumpToLog(*m_map, m_process_address, log);
    }

    for (EntityUP &entity_up : m_materializer->m_entities) {
      entity_up->Dematerialize(frame_sp, *m_map, m_process_address, frame_top,
                               frame_bottom, error);

      if (!error.Success())
        break;
    }
  }

  Wipe();
}

void IRMemoryMap::Leak(lldb::addr_t process_address, Status &error) {
  error.Clear();

  AllocationMap::iterator iter = m_allocations.find(process_address);

  if (iter == m_allocations.end()) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't leak: allocation doesn't exist");
    return;
  }

  Allocation &allocation = iter->second;

  allocation.m_leak = true;
}

void IRMemoryMap::Free(lldb::addr_t process_address, Status &error) {
  error.Clear();

  AllocationMap::iterator iter = m_allocations.find(process_address);

  if (iter == m_allocations.end()) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't free: allocation doesn't exist");
    return;
  }

  Allocation &allocation = iter->second;

  switch (allocation.m_policy) {
  default:
  case eAllocationPolicyHostOnly: {
    lldb::ProcessSP process_sp = m_process_wp.lock();
    if (process_sp) {
      if (process_sp->CanJIT() && process_sp->IsAlive())
        process_sp->DeallocateMemory(
            allocation.m_process_alloc); // FindSpace allocated this for real
    }

    break;
  }
  case eAllocationPolicyMirror:
  case eAllocationPolicyProcessOnly: {
    lldb::ProcessSP process_sp = m_process_wp.lock();
    if (process_sp)
      process_sp->DeallocateMemory(allocation.m_process_alloc);
  }
  }

  if (lldb_private::Log *log =
          lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)) {
    log->Printf("IRMemoryMap::Free (0x%" PRIx64 ") freed [0x%" PRIx64
                "..0x%" PRIx64 ")",
                (uint64_t)process_address, iter->second.m_process_start,
                iter->second.m_process_start + iter->second.m_size);
  }

  m_allocations.erase(iter);
}

Status PlatformRemoteDarwinDevice::ResolveExecutable(
    const ModuleSpec &ms, lldb::ModuleSP &exe_module_sp,
    const FileSpecList *module_search_paths_ptr) {
  Status error;
  // Nothing special to do here, just use the actual file and architecture

  ModuleSpec resolved_module_spec(ms);

  // Resolve any executable within a bundle on MacOSX
  // TODO: verify that this handles shallow bundles, if not then implement one
  // ourselves
  Host::ResolveExecutableInBundle(resolved_module_spec.GetFileSpec());

  if (FileSystem::Instance().Exists(resolved_module_spec.GetFileSpec())) {
    if (resolved_module_spec.GetArchitecture().IsValid() ||
        resolved_module_spec.GetUUID().IsValid()) {
      error = ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
                                          NULL, NULL, NULL);

      if (exe_module_sp && exe_module_sp->GetObjectFile())
        return error;
      exe_module_sp.reset();
    }
    // No valid architecture was specified or the exact ARM slice wasn't found
    // so ask the platform for the architectures that we should be using (in
    // the correct order) and see if we can find a match that way
    StreamString arch_names;
    for (uint32_t idx = 0; GetSupportedArchitectureAtIndex(
             idx, resolved_module_spec.GetArchitecture());
         ++idx) {
      error = ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
                                          NULL, NULL, NULL);
      // Did we find an executable using one of the
      if (error.Success()) {
        if (exe_module_sp && exe_module_sp->GetObjectFile())
          break;
        else
          error.SetErrorToGenericError();
      }

      if (idx > 0)
        arch_names.PutCString(", ");
      arch_names.PutCString(
          resolved_module_spec.GetArchitecture().GetArchitectureName());
    }

    if (error.Fail() || !exe_module_sp) {
      if (FileSystem::Instance().Readable(resolved_module_spec.GetFileSpec())) {
        error.SetErrorStringWithFormat(
            "'%s' doesn't contain any '%s' platform architectures: %s",
            resolved_module_spec.GetFileSpec().GetPath().c_str(),
            GetPluginName().GetCString(), arch_names.GetData());
      } else {
        error.SetErrorStringWithFormat(
            "'%s' is not readable",
            resolved_module_spec.GetFileSpec().GetPath().c_str());
      }
    }
  } else {
    error.SetErrorStringWithFormat(
        "'%s' does not exist",
        resolved_module_spec.GetFileSpec().GetPath().c_str());
  }

  return error;
}

void IRMemoryMap::GetMemoryData(DataExtractor &extractor,
                                lldb::addr_t process_address, size_t size,
                                Status &error) {
  error.Clear();

  if (size > 0) {
    AllocationMap::iterator iter = FindAllocation(process_address, size);

    if (iter == m_allocations.end()) {
      error.SetErrorToGenericError();
      error.SetErrorStringWithFormat(
          "Couldn't find an allocation containing [0x%" PRIx64 "..0x%" PRIx64
          ")",
          process_address, process_address + size);
      return;
    }

    Allocation &allocation = iter->second;

    switch (allocation.m_policy) {
    default:
      error.SetErrorToGenericError();
      error.SetErrorString(
          "Couldn't get memory data: invalid allocation policy");
      return;
    case eAllocationPolicyProcessOnly:
      error.SetErrorToGenericError();
      error.SetErrorString(
          "Couldn't get memory data: memory is only in the target");
      return;
    case eAllocationPolicyMirror: {
      lldb::ProcessSP process_sp = m_process_wp.lock();

      if (!allocation.m_data.GetByteSize()) {
        error.SetErrorToGenericError();
        error.SetErrorString("Couldn't get memory data: data buffer is empty");
        return;
      }
      if (process_sp) {
        process_sp->ReadMemory(allocation.m_process_start,
                               allocation.m_data.GetBytes(),
                               allocation.m_data.GetByteSize(), error);
        if (!error.Success())
          return;
        uint64_t offset = process_address - allocation.m_process_start;
        extractor = DataExtractor(allocation.m_data.GetBytes() + offset, size,
                                  GetByteOrder(), GetAddressByteSize());
        return;
      }
    } break;
    case eAllocationPolicyHostOnly:
      if (!allocation.m_data.GetByteSize()) {
        error.SetErrorToGenericError();
        error.SetErrorString("Couldn't get memory data: data buffer is empty");
        return;
      }
      uint64_t offset = process_address - allocation.m_process_start;
      extractor = DataExtractor(allocation.m_data.GetBytes() + offset, size,
                                GetByteOrder(), GetAddressByteSize());
      return;
    }
  } else {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't get memory data: its size was zero");
    return;
  }
}

void IRMemoryMap::ReadMemory(uint8_t *bytes, lldb::addr_t process_address,
                             size_t size, Status &error) {
  error.Clear();

  AllocationMap::iterator iter = FindAllocation(process_address, size);

  if (iter == m_allocations.end()) {
    lldb::ProcessSP process_sp = m_process_wp.lock();

    if (process_sp) {
      process_sp->ReadMemory(process_address, bytes, size, error);
      return;
    }

    lldb::TargetSP target_sp = m_target_wp.lock();

    if (target_sp) {
      Address absolute_address(process_address);
      target_sp->ReadMemory(absolute_address, false, bytes, size, error);
      return;
    }

    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't read: no allocation contains the target "
                         "range, and neither the process nor the target exist");
    return;
  }

  Allocation &allocation = iter->second;

  uint64_t offset = process_address - allocation.m_process_start;

  if (offset > allocation.m_size) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't read: data is not in the allocation");
    return;
  }

  lldb::ProcessSP process_sp;

  switch (allocation.m_policy) {
  default:
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't read: invalid allocation policy");
    return;
  case eAllocationPolicyHostOnly:
    if (!allocation.m_data.GetByteSize()) {
      error.SetErrorToGenericError();
      error.SetErrorString("Couldn't read: data buffer is empty");
      return;
    }
    if (allocation.m_data.GetByteSize() < offset + size) {
      error.SetErrorToGenericError();
      error.SetErrorString("Couldn't read: not enough underlying data");
      return;
    }

    ::memcpy(bytes, allocation.m_data.GetBytes() + offset, size);
    break;
  case eAllocationPolicyMirror:
    process_sp = m_process_wp.lock();
    if (process_sp) {
      process_sp->ReadMemory(process_address, bytes, size, error);
      if (!error.Success())
        return;
    } else {
      if (!allocation.m_data.GetByteSize()) {
        error.SetErrorToGenericError();
        error.SetErrorString("Couldn't read: data buffer is empty");
        return;
      }
      ::memcpy(bytes, allocation.m_data.GetBytes() + offset, size);
    }
    break;
  case eAllocationPolicyProcessOnly:
    process_sp = m_process_wp.lock();
    if (process_sp) {
      process_sp->ReadMemory(process_address, bytes, size, error);
      if (!error.Success())
        return;
    }
    break;
  }

  if (lldb_private::Log *log =
          lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)) {
    log->Printf("IRMemoryMap::ReadMemory (0x%" PRIx64 ", 0x%" PRIx64
                ", 0x%" PRId64 ") came from [0x%" PRIx64 "..0x%" PRIx64 ")",
                (uint64_t)process_address, (uint64_t)bytes, (uint64_t)size,
                (uint64_t)allocation.m_process_start,
                (uint64_t)allocation.m_process_start +
                    (uint64_t)allocation.m_size);
  }
}

void IRMemoryMap::WriteMemory(lldb::addr_t process_address,
                              const uint8_t *bytes, size_t size,
                              Status &error) {
  error.Clear();

  AllocationMap::iterator iter = FindAllocation(process_address, size);

  if (iter == m_allocations.end()) {
    lldb::ProcessSP process_sp = m_process_wp.lock();

    if (process_sp) {
      process_sp->WriteMemory(process_address, bytes, size, error);
      return;
    }

    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't write: no allocation contains the target "
                         "range and the process doesn't exist");
    return;
  }

  Allocation &allocation = iter->second;

  uint64_t offset = process_address - allocation.m_process_start;

  lldb::ProcessSP process_sp;

  switch (allocation.m_policy) {
  default:
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't write: invalid allocation policy");
    return;
  case eAllocationPolicyHostOnly:
    if (!allocation.m_data.GetByteSize()) {
      error.SetErrorToGenericError();
      error.SetErrorString("Couldn't write: data buffer is empty");
      return;
    }
    ::memcpy(allocation.m_data.GetBytes() + offset, bytes, size);
    break;
  case eAllocationPolicyMirror:
    if (!allocation.m_data.GetByteSize()) {
      error.SetErrorToGenericError();
      error.SetErrorString("Couldn't write: data buffer is empty");
      return;
    }
    ::memcpy(allocation.m_data.GetBytes() + offset, bytes, size);
    process_sp = m_process_wp.lock();
    if (process_sp) {
      process_sp->WriteMemory(process_address, bytes, size, error);
      if (!error.Success())
        return;
    }
    break;
  case eAllocationPolicyProcessOnly:
    process_sp = m_process_wp.lock();
    if (process_sp) {
      process_sp->WriteMemory(process_address, bytes, size, error);
      if (!error.Success())
        return;
    }
    break;
  }

  if (lldb_private::Log *log =
          lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)) {
    log->Printf("IRMemoryMap::WriteMemory (0x%" PRIx64 ", 0x%" PRIx64
                ", 0x%" PRId64 ") went to [0x%" PRIx64 "..0x%" PRIx64 ")",
                (uint64_t)process_address, (uint64_t)bytes, (uint64_t)size,
                (uint64_t)allocation.m_process_start,
                (uint64_t)allocation.m_process_start +
                    (uint64_t)allocation.m_size);
  }
}

lldb::addr_t IRMemoryMap::Malloc(size_t size, uint8_t alignment,
                                 uint32_t permissions, AllocationPolicy policy,
                                 bool zero_memory, Status &error) {
  lldb_private::Log *log(
      lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
  error.Clear();

  lldb::ProcessSP process_sp;
  lldb::addr_t allocation_address = LLDB_INVALID_ADDRESS;
  lldb::addr_t aligned_address = LLDB_INVALID_ADDRESS;

  size_t allocation_size;

  if (size == 0) {
    // FIXME: Malloc(0) should either return an invalid address or assert, in
    // order to cut down on unnecessary allocations.
    allocation_size = alignment;
  } else {
    // Round up the requested size to an aligned value.
    allocation_size = llvm::alignTo(size, alignment);

    // The process page cache does not see the requested alignment. We can't
    // assume its result will be any more than 1-byte aligned. To work around
    // this, request `alignment - 1` additional bytes.
    allocation_size += alignment - 1;
  }

  switch (policy) {
  default:
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't malloc: invalid allocation policy");
    return LLDB_INVALID_ADDRESS;
  case eAllocationPolicyHostOnly:
    allocation_address = FindSpace(allocation_size);
    if (allocation_address == LLDB_INVALID_ADDRESS) {
      error.SetErrorToGenericError();
      error.SetErrorString("Couldn't malloc: address space is full");
      return LLDB_INVALID_ADDRESS;
    }
    break;
  case eAllocationPolicyMirror:
    process_sp = m_process_wp.lock();
    if (log)
      log->Printf("IRMemoryMap::%s process_sp=0x%" PRIx64
                  ", process_sp->CanJIT()=%s, process_sp->IsAlive()=%s",
                  __FUNCTION__, (lldb::addr_t)process_sp.get(),
                  process_sp && process_sp->CanJIT() ? "true" : "false",
                  process_sp && process_sp->IsAlive() ? "true" : "false");
    if (process_sp && process_sp->CanJIT() && process_sp->IsAlive()) {
      if (!zero_memory)
        allocation_address =
            process_sp->AllocateMemory(allocation_size, permissions, error);
      else
        allocation_address =
            process_sp->CallocateMemory(allocation_size, permissions, error);

      if (!error.Success())
        return LLDB_INVALID_ADDRESS;
    } else {
      if (log)
        log->Printf("IRMemoryMap::%s switching to eAllocationPolicyHostOnly "
                    "due to failed condition (see previous expr log message)",
                    __FUNCTION__);
      policy = eAllocationPolicyHostOnly;
      allocation_address = FindSpace(allocation_size);
      if (allocation_address == LLDB_INVALID_ADDRESS) {
        error.SetErrorToGenericError();
        error.SetErrorString("Couldn't malloc: address space is full");
        return LLDB_INVALID_ADDRESS;
      }
    }
    break;
  case eAllocationPolicyProcessOnly:
    process_sp = m_process_wp.lock();
    if (process_sp) {
      if (process_sp->CanJIT() && process_sp->IsAlive()) {
        if (!zero_memory)
          allocation_address =
              process_sp->AllocateMemory(allocation_size, permissions, error);
        else
          allocation_address =
              process_sp->CallocateMemory(allocation_size, permissions, error);

        if (!error.Success())
          return LLDB_INVALID_ADDRESS;
      } else {
        error.SetErrorToGenericError();
        error.SetErrorString(
            "Couldn't malloc: process doesn't support allocating memory");
        return LLDB_INVALID_ADDRESS;
      }
    } else {
      error.SetErrorToGenericError();
      error.SetErrorString("Couldn't malloc: process doesn't exist, and this "
                           "memory must be in the process");
      return LLDB_INVALID_ADDRESS;
    }
    break;
  }

//.........这里部分代码省略.........