[lldb] Add ScriptedPlatform python implementation

This patch introduces both the Scripted Platform python base
implementation and an example for it.

The base implementation is embedded in lldb python module under
`lldb.plugins.scripted_platform`.

This patch also refactor the various SWIG methods to create scripted
objects into a single method, that is now shared between the Scripted
Platform, Process and Thread. It also replaces the target argument by a
execution context object.

Differential Revision: https://reviews.llvm.org/D139250

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

3 files changed, 16 insertions, 17 deletions

diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/SWIGPythonBridge.h b/lldb/source/Plugins/ScriptInterpreter/Python/SWIGPythonBridge.h
index 35c9621..3dc2864 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/SWIGPythonBridge.h
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/SWIGPythonBridge.h
@@ -96,14 +96,10 @@ void *LLDBSWIGPython_CastPyObjectToSBMemoryRegionInfo(PyObject *data);
 // Although these are scripting-language specific, their definition depends on
 // the public API.
 
-python::PythonObject LLDBSwigPythonCreateScriptedProcess(
+python::PythonObject LLDBSwigPythonCreateScriptedObject(
     const char *python_class_name, const char *session_dictionary_name,
-    const lldb::TargetSP &target_sp, const StructuredDataImpl &args_impl,
-    std::string &error_string);
-
-python::PythonObject LLDBSwigPythonCreateScriptedThread(
-    const char *python_class_name, const char *session_dictionary_name,
-    const lldb::ProcessSP &process_sp, const StructuredDataImpl &args_impl,
+    lldb::ExecutionContextRefSP exe_ctx_sp,
+    const lldb_private::StructuredDataImpl &args_impl,
     std::string &error_string);
 
 llvm::Expected<bool> LLDBSwigPythonBreakpointCallbackFunction(
diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.cpp b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.cpp
index 5fd085d..6f087e8 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.cpp
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.cpp
@@ -37,16 +37,18 @@ StructuredData::GenericSP ScriptedProcessPythonInterface::CreatePluginObject(
   if (class_name.empty())
     return {};
 
-  TargetSP target_sp = exe_ctx.GetTargetSP();
   StructuredDataImpl args_impl(args_sp);
   std::string error_string;
 
   Locker py_lock(&m_interpreter, Locker::AcquireLock | Locker::NoSTDIN,
                  Locker::FreeLock);
 
-  PythonObject ret_val = LLDBSwigPythonCreateScriptedProcess(
-      class_name.str().c_str(), m_interpreter.GetDictionaryName(), target_sp,
-      args_impl, error_string);
+  lldb::ExecutionContextRefSP exe_ctx_ref_sp =
+      std::make_shared<ExecutionContextRef>(exe_ctx);
+
+  PythonObject ret_val = LLDBSwigPythonCreateScriptedObject(
+      class_name.str().c_str(), m_interpreter.GetDictionaryName(),
+      exe_ctx_ref_sp, args_impl, error_string);
 
   m_object_instance_sp =
       StructuredData::GenericSP(new StructuredPythonObject(std::move(ret_val)));
diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedThreadPythonInterface.cpp b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedThreadPythonInterface.cpp
index 21d2ed3..1b31ed2 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedThreadPythonInterface.cpp
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptedThreadPythonInterface.cpp
@@ -35,7 +35,6 @@ StructuredData::GenericSP ScriptedThreadPythonInterface::CreatePluginObject(
   if (class_name.empty() && !script_obj)
     return {};
 
-  ProcessSP process_sp = exe_ctx.GetProcessSP();
   StructuredDataImpl args_impl(args_sp);
   std::string error_string;
 
@@ -44,11 +43,13 @@ StructuredData::GenericSP ScriptedThreadPythonInterface::CreatePluginObject(
 
   PythonObject ret_val;
 
-  if (!script_obj)
-    ret_val = LLDBSwigPythonCreateScriptedThread(
-        class_name.str().c_str(), m_interpreter.GetDictionaryName(), process_sp,
-        args_impl, error_string);
-  else
+  if (!script_obj) {
+    lldb::ExecutionContextRefSP exe_ctx_ref_sp =
+        std::make_shared<ExecutionContextRef>(exe_ctx);
+    ret_val = LLDBSwigPythonCreateScriptedObject(
+        class_name.str().c_str(), m_interpreter.GetDictionaryName(),
+        exe_ctx_ref_sp, args_impl, error_string);
+  } else
     ret_val = PythonObject(PyRefType::Borrowed,
                            static_cast<PyObject *>(script_obj->GetValue()));