1 //===-- MonitoringProcessLauncher.cpp -------------------------------------===//
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/LLDBLog.h"
14 #include "lldb/Utility/Log.h"
15 
16 #include "llvm/Support/FileSystem.h"
17 
18 using namespace lldb;
19 using namespace lldb_private;
20 
MonitoringProcessLauncher(std::unique_ptr<ProcessLauncher> delegate_launcher)21 MonitoringProcessLauncher::MonitoringProcessLauncher(
22     std::unique_ptr<ProcessLauncher> delegate_launcher)
23     : m_delegate_launcher(std::move(delegate_launcher)) {}
24 
25 HostProcess
LaunchProcess(const ProcessLaunchInfo & launch_info,Status & error)26 MonitoringProcessLauncher::LaunchProcess(const ProcessLaunchInfo &launch_info,
27                                          Status &error) {
28   ProcessLaunchInfo resolved_info(launch_info);
29 
30   error.Clear();
31 
32   FileSystem &fs = FileSystem::Instance();
33   FileSpec exe_spec(resolved_info.GetExecutableFile());
34 
35   if (!fs.Exists(exe_spec))
36     FileSystem::Instance().Resolve(exe_spec);
37 
38   if (!fs.Exists(exe_spec))
39     FileSystem::Instance().ResolveExecutableLocation(exe_spec);
40 
41   if (!fs.Exists(exe_spec)) {
42     error.SetErrorStringWithFormatv("executable doesn't exist: '{0}'",
43                                     exe_spec);
44     return HostProcess();
45   }
46 
47   resolved_info.SetExecutableFile(exe_spec, false);
48   assert(!resolved_info.GetFlags().Test(eLaunchFlagLaunchInTTY));
49 
50   HostProcess process =
51       m_delegate_launcher->LaunchProcess(resolved_info, error);
52 
53   if (process.GetProcessId() != LLDB_INVALID_PROCESS_ID) {
54     Log *log = GetLog(LLDBLog::Process);
55 
56     assert(launch_info.GetMonitorProcessCallback());
57     llvm::Expected<HostThread> maybe_thread =
58         process.StartMonitoring(launch_info.GetMonitorProcessCallback());
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 }
71