[lldb/Plugins] Add ScriptedProcess Process Plugin

This patch introduces Scripted Processes to lldb.

The goal, here, is to be able to attach in the debugger to fake processes
that are backed by script files (in Python, Lua, Swift, etc ...) and
inspect them statically.

Scripted Processes can be used in cooperative multithreading environments
like the XNU Kernel or other real-time operating systems, but it can
also help us improve the debugger testing infrastructure by writting
synthetic tests that simulates hard-to-reproduce process/thread states.

Although ScriptedProcess is not feature-complete at the moment, it has
basic execution capabilities and will improve in the following patches.

rdar://65508855

Differential Revision: https://reviews.llvm.org/D100384

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>

lldb/examples/python/scripted_process/my_scripted_process.py

@@ -29,6 +29,9 @@ class MyScriptedProcess(ScriptedProcess):
     def get_process_id(self) -> int:
         return 42
 
+    def should_stop(self) -> bool:
+        return True
+
     def is_alive(self) -> bool:
         return True
 

lldb/examples/python/scripted_process/scripted_process.py

@@ -137,6 +137,24 @@ class ScriptedProcess:
         """
         return lldb.SBError()
 
+    @abstractmethod
+    def should_stop(self):
+        """ Check if the scripted process plugin should produce the stop event.
+
+        Returns:
+            bool: True if scripted process should broadcast a stop event.
+                  False otherwise.
+        """
+        pass
+
+    def stop(self):
+        """ Trigger the scripted process stop.
+
+        Returns:
+            lldb.SBError: An `lldb.SBError` with error code 0.
+        """
+        return lldb.SBError()
+
     @abstractmethod
     def is_alive(self):
         """ Check if the scripted process is alive.

lldb/include/lldb/Interpreter/ScriptInterpreter.h

@@ -144,7 +144,8 @@ public:
 
   ScriptInterpreter(
       Debugger &debugger, lldb::ScriptLanguage script_lang,
-      lldb::ScriptedProcessInterfaceUP scripted_process_interface_up = {});
+      lldb::ScriptedProcessInterfaceUP scripted_process_interface_up =
+          std::make_unique<ScriptedProcessInterface>());
 
   ~ScriptInterpreter() override = default;
 

lldb/include/lldb/Interpreter/ScriptedProcessInterface.h

@@ -32,6 +32,10 @@ public:
 
   virtual Status Resume() { return Status("ScriptedProcess did not resume"); }
 
+  virtual bool ShouldStop() { return true; }
+
+  virtual Status Stop() { return Status("ScriptedProcess did not stop"); }
+
   virtual lldb::MemoryRegionInfoSP
   GetMemoryRegionContainingAddress(lldb::addr_t address) {
     return nullptr;

lldb/include/lldb/Target/Process.h

@@ -2602,8 +2602,6 @@ protected:
   virtual size_t DoReadMemory(lldb::addr_t vm_addr, void *buf, size_t size,
                               Status &error) = 0;
 
-  void SetState(lldb::EventSP &event_sp);
-
   lldb::StateType GetPrivateState();
 
   /// The "private" side of resuming a process.  This doesn't alter the state

lldb/source/Plugins/Process/CMakeLists.txt

@@ -12,6 +12,7 @@ elseif (CMAKE_SYSTEM_NAME MATCHES "Windows")
 elseif (CMAKE_SYSTEM_NAME MATCHES "Darwin")
   add_subdirectory(MacOSX-Kernel)
 endif()
+add_subdirectory(scripted)
 add_subdirectory(gdb-remote)
 add_subdirectory(Utility)
 add_subdirectory(elf-core)

lldb/source/Plugins/Process/scripted/CMakeLists.txt

@@ -0,0 +1,13 @@
+add_lldb_library(lldbPluginScriptedProcess PLUGIN
+  ScriptedProcess.cpp
+
+  LINK_LIBS
+    lldbCore
+    lldbTarget
+    lldbUtility
+    lldbPluginProcessUtility
+  LINK_COMPONENTS
+    BinaryFormat
+    Object
+    Support
+  )

lldb/source/Plugins/Process/scripted/ScriptedProcess.cpp

@@ -0,0 +1,313 @@
+//===-- ScriptedProcess.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 "ScriptedProcess.h"
+
+#include "lldb/Core/Debugger.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/PluginManager.h"
+
+#include "lldb/Host/OptionParser.h"
+#include "lldb/Host/ThreadLauncher.h"
+#include "lldb/Interpreter/CommandInterpreter.h"
+#include "lldb/Interpreter/OptionArgParser.h"
+#include "lldb/Interpreter/OptionGroupBoolean.h"
+#include "lldb/Interpreter/ScriptInterpreter.h"
+#include "lldb/Target/MemoryRegionInfo.h"
+#include "lldb/Target/RegisterContext.h"
+
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/Logging.h"
+#include "lldb/Utility/State.h"
+
+#include <mutex>
+
+LLDB_PLUGIN_DEFINE(ScriptedProcess)
+
+using namespace lldb;
+using namespace lldb_private;
+
+ConstString ScriptedProcess::GetPluginNameStatic() {
+  static ConstString g_name("ScriptedProcess");
+  return g_name;
+}
+
+const char *ScriptedProcess::GetPluginDescriptionStatic() {
+  return "Scripted Process plug-in.";
+}
+
+static constexpr lldb::ScriptLanguage g_supported_script_languages[] = {
+    ScriptLanguage::eScriptLanguagePython,
+};
+
+bool ScriptedProcess::IsScriptLanguageSupported(lldb::ScriptLanguage language) {
+  llvm::ArrayRef<lldb::ScriptLanguage> supported_languages =
+      llvm::makeArrayRef(g_supported_script_languages);
+
+  return llvm::is_contained(supported_languages, language);
+}
+
+void ScriptedProcess::CheckInterpreterAndScriptObject() const {
+  lldbassert(m_interpreter && "Invalid Script Interpreter.");
+  lldbassert(m_script_object_sp && "Invalid Script Object.");
+}
+
+lldb::ProcessSP ScriptedProcess::CreateInstance(lldb::TargetSP target_sp,
+                                                lldb::ListenerSP listener_sp,
+                                                const FileSpec *file,
+                                                bool can_connect) {
+  if (!target_sp ||
+      !IsScriptLanguageSupported(target_sp->GetDebugger().GetScriptLanguage()))
+    return nullptr;
+
+  Status error;
+  ScriptedProcess::ScriptedProcessInfo scripted_process_info(
+      target_sp->GetProcessLaunchInfo());
+
+  auto process_sp = std::make_shared<ScriptedProcess>(
+      target_sp, listener_sp, scripted_process_info, error);
+
+  if (error.Fail() || !process_sp || !process_sp->m_script_object_sp ||
+      !process_sp->m_script_object_sp->IsValid()) {
+    LLDB_LOGF(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS), "%s",
+              error.AsCString());
+    return nullptr;
+  }
+
+  return process_sp;
+}
+
+bool ScriptedProcess::CanDebug(lldb::TargetSP target_sp,
+                               bool plugin_specified_by_name) {
+  return true;
+}
+
+ScriptedProcess::ScriptedProcess(
+    lldb::TargetSP target_sp, lldb::ListenerSP listener_sp,
+    const ScriptedProcess::ScriptedProcessInfo &scripted_process_info,
+    Status &error)
+    : Process(target_sp, listener_sp),
+      m_scripted_process_info(scripted_process_info) {
+
+  if (!target_sp) {
+    error.SetErrorStringWithFormat("ScriptedProcess::%s () - ERROR: %s",
+                                   __FUNCTION__, "Invalid target");
+    return;
+  }
+
+  m_interpreter = target_sp->GetDebugger().GetScriptInterpreter();
+
+  if (!m_interpreter) {
+    error.SetErrorStringWithFormat("ScriptedProcess::%s () - ERROR: %s",
+                                   __FUNCTION__,
+                                   "Debugger has no Script Interpreter");
+    return;
+  }
+
+  StructuredData::ObjectSP object_sp = GetInterface().CreatePluginObject(
+      m_scripted_process_info.GetClassName().c_str(), target_sp,
+      m_scripted_process_info.GetDictionarySP());
+
+  if (!object_sp || !object_sp->IsValid()) {
+    error.SetErrorStringWithFormat("ScriptedProcess::%s () - ERROR: %s",
+                                   __FUNCTION__,
+                                   "Failed to create valid script object");
+    return;
+  }
+
+  m_script_object_sp = object_sp;
+}
+
+ScriptedProcess::~ScriptedProcess() {
+  Clear();
+  // We need to call finalize on the process before destroying ourselves to
+  // make sure all of the broadcaster cleanup goes as planned. If we destruct
+  // this class, then Process::~Process() might have problems trying to fully
+  // destroy the broadcaster.
+  Finalize();
+}
+
+void ScriptedProcess::Initialize() {
+  static llvm::once_flag g_once_flag;
+
+  llvm::call_once(g_once_flag, []() {
+    PluginManager::RegisterPlugin(GetPluginNameStatic(),
+                                  GetPluginDescriptionStatic(), CreateInstance);
+  });
+}
+
+void ScriptedProcess::Terminate() {
+  PluginManager::UnregisterPlugin(ScriptedProcess::CreateInstance);
+}
+
+ConstString ScriptedProcess::GetPluginName() { return GetPluginNameStatic(); }
+
+uint32_t ScriptedProcess::GetPluginVersion() { return 1; }
+
+Status ScriptedProcess::DoLoadCore() {
+  ProcessLaunchInfo launch_info = GetTarget().GetProcessLaunchInfo();
+
+  return DoLaunch(nullptr, launch_info);
+}
+
+Status ScriptedProcess::DoLaunch(Module *exe_module,
+                                 ProcessLaunchInfo &launch_info) {
+  CheckInterpreterAndScriptObject();
+
+  /* FIXME: This doesn't reflect how lldb actually launches a process.
+           In reality, it attaches to debugserver, then resume the process. */
+  Status error = GetInterface().Launch();
+  SetPrivateState(eStateRunning);
+
+  if (error.Fail())
+    return error;
+
+  // TODO: Fetch next state from stopped event queue then send stop event
+  //  const StateType state = SetThreadStopInfo(response);
+  //  if (state != eStateInvalid) {
+  //    SetPrivateState(state);
+
+  SetPrivateState(eStateStopped);
+
+  UpdateThreadListIfNeeded();
+  GetThreadList();
+
+  return {};
+}
+
+void ScriptedProcess::DidLaunch() {
+  CheckInterpreterAndScriptObject();
+  m_pid = GetInterface().GetProcessID();
+}
+
+Status ScriptedProcess::DoResume() {
+  CheckInterpreterAndScriptObject();
+
+  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+  // FIXME: Fetch data from thread.
+  const StateType thread_resume_state = eStateRunning;
+  LLDB_LOGF(log, "ScriptedProcess::%s thread_resume_state = %s", __FUNCTION__,
+            StateAsCString(thread_resume_state));
+
+  bool resume = (thread_resume_state == eStateRunning);
+  assert(thread_resume_state == eStateRunning && "invalid thread resume state");
+
+  Status error;
+  if (resume) {
+    LLDB_LOGF(log, "ScriptedProcess::%s sending resume", __FUNCTION__);
+
+    SetPrivateState(eStateRunning);
+    SetPrivateState(eStateStopped);
+    error = GetInterface().Resume();
+  }
+
+  return error;
+}
+
+Status ScriptedProcess::DoStop() {
+  CheckInterpreterAndScriptObject();
+
+  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  if (GetInterface().ShouldStop()) {
+    SetPrivateState(eStateStopped);
+    LLDB_LOGF(log, "ScriptedProcess::%s Immediate stop", __FUNCTION__);
+    return {};
+  }
+
+  LLDB_LOGF(log, "ScriptedProcess::%s Delayed stop", __FUNCTION__);
+  return GetInterface().Stop();
+}
+
+Status ScriptedProcess::DoDestroy() { return Status(); }
+
+bool ScriptedProcess::IsAlive() {
+  if (m_interpreter && m_script_object_sp)
+    return GetInterface().IsAlive();
+  return false;
+}
+
+size_t ScriptedProcess::DoReadMemory(lldb::addr_t addr, void *buf, size_t size,
+                                     Status &error) {
+
+  auto error_with_message = [&error](llvm::StringRef message) {
+    error.SetErrorString(message);
+    return 0;
+  };
+
+  if (!m_interpreter)
+    return error_with_message("No interpreter.");
+
+  lldb::DataExtractorSP data_extractor_sp =
+      GetInterface().ReadMemoryAtAddress(addr, size, error);
+
+  if (!data_extractor_sp || error.Fail())
+    return 0;
+
+  offset_t bytes_copied = data_extractor_sp->CopyByteOrderedData(
+      0, data_extractor_sp->GetByteSize(), buf, size, GetByteOrder());
+
+  if (!bytes_copied || bytes_copied == LLDB_INVALID_OFFSET)
+    return error_with_message("Failed to copy read memory to buffer.");
+
+  return size;
+}
+
+ArchSpec ScriptedProcess::GetArchitecture() {
+  return GetTarget().GetArchitecture();
+}
+
+Status ScriptedProcess::GetMemoryRegionInfo(lldb::addr_t load_addr,
+                                            MemoryRegionInfo &region) {
+  // TODO: Implement
+  return Status();
+}
+
+Status ScriptedProcess::GetMemoryRegions(MemoryRegionInfos &region_list) {
+  CheckInterpreterAndScriptObject();
+
+  lldb::addr_t address = 0;
+  lldb::MemoryRegionInfoSP mem_region_sp = nullptr;
+
+  while ((mem_region_sp =
+              GetInterface().GetMemoryRegionContainingAddress(address))) {
+    auto range = mem_region_sp->GetRange();
+    address += range.GetRangeBase() + range.GetByteSize();
+    region_list.push_back(*mem_region_sp.get());
+  }
+
+  return {};
+}
+
+void ScriptedProcess::Clear() { Process::m_thread_list.Clear(); }
+
+bool ScriptedProcess::DoUpdateThreadList(ThreadList &old_thread_list,
+                                         ThreadList &new_thread_list) {
+  // TODO: Implement
+  // This is supposed to get the current set of threads, if any of them are in
+  // old_thread_list then they get copied to new_thread_list, and then any
+  // actually new threads will get added to new_thread_list.
+  return new_thread_list.GetSize(false) > 0;
+}
+
+bool ScriptedProcess::GetProcessInfo(ProcessInstanceInfo &info) {
+  info.Clear();
+  info.SetProcessID(GetID());
+  info.SetArchitecture(GetArchitecture());
+  lldb::ModuleSP module_sp = GetTarget().GetExecutableModule();
+  if (module_sp) {
+    const bool add_exe_file_as_first_arg = false;
+    info.SetExecutableFile(GetTarget().GetExecutableModule()->GetFileSpec(),
+                           add_exe_file_as_first_arg);
+  }
+  return true;
+}
+
+ScriptedProcessInterface &ScriptedProcess::GetInterface() const {
+  return m_interpreter->GetScriptedProcessInterface();
+}

lldb/source/Plugins/Process/scripted/ScriptedProcess.h

@@ -0,0 +1,119 @@
+//===-- ScriptedProcess.h ------------------------------------- -*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_SOURCE_PLUGINS_SCRIPTED_PROCESS_H
+#define LLDB_SOURCE_PLUGINS_SCRIPTED_PROCESS_H
+
+#include "lldb/Target/Process.h"
+#include "lldb/Utility/ConstString.h"
+#include "lldb/Utility/Status.h"
+
+#include <mutex>
+
+namespace lldb_private {
+
+class ScriptedProcess : public Process {
+protected:
+  class ScriptedProcessInfo {
+  public:
+    ScriptedProcessInfo(const ProcessLaunchInfo &launch_info) {
+      m_class_name = launch_info.GetScriptedProcessClassName();
+      m_dictionary_sp = launch_info.GetScriptedProcessDictionarySP();
+    }
+
+    std::string GetClassName() const { return m_class_name; }
+    StructuredData::DictionarySP GetDictionarySP() const {
+      return m_dictionary_sp;
+    }
+
+  private:
+    std::string m_class_name;
+    StructuredData::DictionarySP m_dictionary_sp;
+  };
+
+public:
+  static lldb::ProcessSP CreateInstance(lldb::TargetSP target_sp,
+                                        lldb::ListenerSP listener_sp,
+                                        const FileSpec *crash_file_path,
+                                        bool can_connect);
+
+  static void Initialize();
+
+  static void Terminate();
+
+  static ConstString GetPluginNameStatic();
+
+  static const char *GetPluginDescriptionStatic();
+
+  ScriptedProcess(lldb::TargetSP target_sp, lldb::ListenerSP listener_sp,
+                  const ScriptedProcess::ScriptedProcessInfo &launch_info,
+                  Status &error);
+
+  ~ScriptedProcess() override;
+
+  bool CanDebug(lldb::TargetSP target_sp,
+                bool plugin_specified_by_name) override;
+
+  DynamicLoader *GetDynamicLoader() override { return nullptr; }
+
+  ConstString GetPluginName() override;
+
+  uint32_t GetPluginVersion() override;
+
+  SystemRuntime *GetSystemRuntime() override { return nullptr; }
+
+  Status DoLoadCore() override;
+
+  Status DoLaunch(Module *exe_module, ProcessLaunchInfo &launch_info) override;
+
+  void DidLaunch() override;
+
+  Status DoResume() override;
+
+  Status DoDestroy() override;
+
+  void RefreshStateAfterStop() override{};
+
+  bool IsAlive() override;
+
+  size_t DoReadMemory(lldb::addr_t addr, void *buf, size_t size,
+                      Status &error) override;
+
+  ArchSpec GetArchitecture();
+
+  Status GetMemoryRegionInfo(lldb::addr_t load_addr,
+                             MemoryRegionInfo &range_info) override;
+
+  Status
+  GetMemoryRegions(lldb_private::MemoryRegionInfos &region_list) override;
+
+  bool GetProcessInfo(ProcessInstanceInfo &info) override;
+
+protected:
+  Status DoStop();
+
+  void Clear();
+
+  bool DoUpdateThreadList(ThreadList &old_thread_list,
+                          ThreadList &new_thread_list) override;
+
+private:
+  void CheckInterpreterAndScriptObject() const;
+  ScriptedProcessInterface &GetInterface() const;
+  static bool IsScriptLanguageSupported(lldb::ScriptLanguage language);
+
+  // Member variables.
+  const ScriptedProcessInfo m_scripted_process_info;
+  lldb_private::ScriptInterpreter *m_interpreter = nullptr;
+  lldb_private::StructuredData::ObjectSP m_script_object_sp = nullptr;
+  //@}
+};
+
+} // namespace lldb_private
+
+#endif // LLDB_SOURCE_PLUGINS_SCRIPTED_PROCESS_H

lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.cpp

@@ -55,15 +55,23 @@ StructuredData::GenericSP ScriptedProcessPythonInterface::CreatePluginObject(
 }
 
 Status ScriptedProcessPythonInterface::Launch() {
-  return LaunchOrResume("launch");
+  return GetStatusFromMethod("launch");
 }
 
 Status ScriptedProcessPythonInterface::Resume() {
-  return LaunchOrResume("resume");
+  return GetStatusFromMethod("resume");
 }
 
-Status
-ScriptedProcessPythonInterface::LaunchOrResume(llvm::StringRef method_name) {
+bool ScriptedProcessPythonInterface::ShouldStop() {
+  return GetGenericInteger("shuold_stop");
+}
+
+Status ScriptedProcessPythonInterface::Stop() {
+  return GetStatusFromMethod("stop");
+}
+
+Status ScriptedProcessPythonInterface::GetStatusFromMethod(
+    llvm::StringRef method_name) {
   Locker py_lock(&m_interpreter, Locker::AcquireLock | Locker::NoSTDIN,
                  Locker::FreeLock);
 
@@ -281,7 +289,6 @@ lldb::pid_t ScriptedProcessPythonInterface::GetProcessID() {
 
 bool ScriptedProcessPythonInterface::IsAlive() {
   return GetGenericInteger("is_alive");
-  ;
 }
 
 #endif

lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.h

@@ -30,6 +30,10 @@ public:
 
   Status Resume() override;
 
+  bool ShouldStop() override;
+
+  Status Stop() override;
+
   lldb::MemoryRegionInfoSP
   GetMemoryRegionContainingAddress(lldb::addr_t address) override;
 
@@ -48,7 +52,7 @@ public:
 
 protected:
   size_t GetGenericInteger(llvm::StringRef method_name);
-  Status LaunchOrResume(llvm::StringRef method_name);
+  Status GetStatusFromMethod(llvm::StringRef method_name);
 
 private:
   // The lifetime is managed by the ScriptInterpreter

lldb/source/Target/Target.cpp

@@ -2974,7 +2974,7 @@ Status Target::Launch(ProcessLaunchInfo &launch_info, Stream *stream) {
   // If we're not already connected to the process, and if we have a platform
   // that can launch a process for debugging, go ahead and do that here.
   if (state != eStateConnected && platform_sp &&
-      platform_sp->CanDebugProcess()) {
+      platform_sp->CanDebugProcess() && !launch_info.IsScriptedProcess()) {
     LLDB_LOGF(log, "Target::%s asking the platform to debug the process",
               __FUNCTION__);
 

lldb/test/API/functionalities/scripted_process/TestScriptedProcess.py

@@ -11,7 +11,7 @@ from lldbsuite.test import lldbutil
 from lldbsuite.test import lldbtest
 
 
-class PlatformProcessCrashInfoTestCase(TestBase):
+class ScriptedProcesTestCase(TestBase):
 
     mydir = TestBase.compute_mydir(__file__)
 
@@ -43,3 +43,55 @@ class PlatformProcessCrashInfoTestCase(TestBase):
         self.expect('script dir(ScriptedProcess)',
                     substrs=["launch"])
 
+    def test_launch_scripted_process_sbapi(self):
+        """Test that we can launch an lldb scripted process using the SBAPI,
+        check its process ID and read string from memory."""
+        self.build()
+        target = self.dbg.CreateTarget(self.getBuildArtifact("a.out"))
+        self.assertTrue(target, VALID_TARGET)
+
+        scripted_process_example_relpath = ['..','..','..','..','examples','python','scripted_process','my_scripted_process.py']
+        os.environ['SKIP_SCRIPTED_PROCESS_LAUNCH'] = '1'
+        self.runCmd("command script import " + os.path.join(self.getSourceDir(),
+                                                            *scripted_process_example_relpath))
+
+        launch_info = lldb.SBLaunchInfo(None)
+        launch_info.SetProcessPluginName("ScriptedProcess")
+        launch_info.SetScriptedProcessClassName("my_scripted_process.MyScriptedProcess")
+
+        error = lldb.SBError()
+        process = target.Launch(launch_info, error)
+        self.assertTrue(process and process.IsValid(), PROCESS_IS_VALID)
+        self.assertEqual(process.GetProcessID(), 42)
+
+        hello_world = "Hello, world!"
+        memory_read = process.ReadCStringFromMemory(0x50000000000,
+                                                    len(hello_world) + 1, # NULL byte
+                                                    error)
+
+        self.assertTrue(error.Success(), "Failed to read memory from scripted process.")
+        self.assertEqual(hello_world, memory_read)
+
+    def test_launch_scripted_process_cli(self):
+        """Test that we can launch an lldb scripted process from the command
+        line, check its process ID and read string from memory."""
+        self.build()
+        target = self.dbg.CreateTarget(self.getBuildArtifact("a.out"))
+        self.assertTrue(target, VALID_TARGET)
+
+        scripted_process_example_relpath = ['..','..','..','..','examples','python','scripted_process','my_scripted_process.py']
+        self.runCmd("command script import " + os.path.join(self.getSourceDir(),
+                                                            *scripted_process_example_relpath))
+
+        process = target.GetProcess()
+        self.assertTrue(process, PROCESS_IS_VALID)
+        self.assertEqual(process.GetProcessID(), 42)
+
+        error = lldb.SBError()
+        hello_world = "Hello, world!"
+        memory_read = process.ReadCStringFromMemory(0x50000000000,
+                                                    len(hello_world) + 1, # NULL byte
+                                                    error)
+
+        self.assertTrue(error.Success(), "Failed to read memory from scripted process.")
+        self.assertEqual(hello_world, memory_read)