contrib/llvm-project/lldb/source/Host/common/MonitoringProcessLauncher.cpp

   1 //===-- MonitoringProcessLauncher.cpp ---------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "lldb/Host/MonitoringProcessLauncher.h"
  10 #include "lldb/Host/FileSystem.h"
  11 #include "lldb/Host/HostProcess.h"
  12 #include "lldb/Host/ProcessLaunchInfo.h"
  13 #include "lldb/Utility/Log.h"
  14
  15 #include "llvm/Support/FileSystem.h"
  16
  17 using namespace lldb;
  18 using namespace lldb_private;
  19
  20 MonitoringProcessLauncher::MonitoringProcessLauncher(
  21     std::unique_ptr<ProcessLauncher> delegate_launcher)
  22     : m_delegate_launcher(std::move(delegate_launcher)) {}
  23
  24 HostProcess
  25 MonitoringProcessLauncher::LaunchProcess(const ProcessLaunchInfo &launch_info,
  26                                          Status &error) {
  27   ProcessLaunchInfo resolved_info(launch_info);
  28
  29   error.Clear();
  30
  31   FileSystem &fs = FileSystem::Instance();
  32   FileSpec exe_spec(resolved_info.GetExecutableFile());
  33
  34   if (!fs.Exists(exe_spec))
  35     FileSystem::Instance().Resolve(exe_spec);
  36
  37   if (!fs.Exists(exe_spec))
  38     FileSystem::Instance().ResolveExecutableLocation(exe_spec);
  39
  40   if (!fs.Exists(exe_spec)) {
  41     error.SetErrorStringWithFormatv("executable doesn't exist: '{0}'",
  42                                     exe_spec);
  43     return HostProcess();
  44   }
  45
  46   resolved_info.SetExecutableFile(exe_spec, false);
  47   assert(!resolved_info.GetFlags().Test(eLaunchFlagLaunchInTTY));
  48
  49   HostProcess process =
  50       m_delegate_launcher->LaunchProcess(resolved_info, error);
  51
  52   if (process.GetProcessId() != LLDB_INVALID_PROCESS_ID) {
  53     Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
  54
  55     assert(launch_info.GetMonitorProcessCallback());
  56     llvm::Expected<HostThread> maybe_thread =
  57         process.StartMonitoring(launch_info.GetMonitorProcessCallback(),
  58                                 launch_info.GetMonitorSignals());
  59     if (!maybe_thread)
  60       error.SetErrorStringWithFormatv("failed to launch host thread: {}",
  61                                       llvm::toString(maybe_thread.takeError()));
  62     if (log)
  63       log->PutCString("started monitoring child process.");
  64   } else {
  65     // Invalid process ID, something didn't go well
  66     if (error.Success())
  67       error.SetErrorString("process launch failed for unknown reasons");
  68   }
  69   return process;
  70 }