[lldb] Make use of Scripted{Python,}Interface for ScriptedThreadPlan (#70392) (#96868)

This patch makes ScriptedThreadPlan conforming to the ScriptedInterface
& ScriptedPythonInterface facilities by introducing 2
ScriptedThreadPlanInterface & ScriptedThreadPlanPythonInterface classes.

This allows us to get rid of every ScriptedThreadPlan-specific SWIG
method and re-use the same affordances as other scripting offordances,
like Scripted{Process,Thread,Platform} & OperatingSystem.

To do so, this adds new transformer methods for `ThreadPlan`, `Stream` &
`Event`, to allow the bijection between C++ objects and their python
counterparts.

This just re-lands #70392 after fixing test failures.

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>

1 files changed, 26 insertions, 3 deletions

diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPythonInterface.h b/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPythonInterface.h
index 163659234466..062bf1fcff4a 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPythonInterface.h
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPythonInterface.h
@@ -115,7 +115,7 @@ public:
           PythonObject::ResolveNameWithDictionary<python::PythonCallable>(
               class_name, dict);
       if (!init.IsAllocated())
-        return create_error(llvm::formatv("Could not find script class: %s",
+        return create_error(llvm::formatv("Could not find script class: {0}",
                                           class_name.data()));
 
       std::tuple<Args...> original_args = std::forward_as_tuple(args...);
@@ -248,8 +248,11 @@ protected:
                              (PyObject *)m_object_instance_sp->GetValue());
 
     if (!implementor.IsAllocated())
-      return ErrorWithMessage<T>(caller_signature,
-                                 "Python implementor not allocated.", error);
+      return llvm::is_contained(GetAbstractMethods(), method_name)
+                 ? ErrorWithMessage<T>(caller_signature,
+                                       "Python implementor not allocated.",
+                                       error)
+                 : T{};
 
     std::tuple<Args...> original_args = std::forward_as_tuple(args...);
     auto transformed_args = TransformArgs(original_args);
@@ -322,6 +325,10 @@ protected:
     return python::SWIGBridge::ToSWIGWrapper(arg);
   }
 
+  python::PythonObject Transform(lldb::ThreadPlanSP arg) {
+    return python::SWIGBridge::ToSWIGWrapper(arg);
+  }
+
   python::PythonObject Transform(lldb::ProcessAttachInfoSP arg) {
     return python::SWIGBridge::ToSWIGWrapper(arg);
   }
@@ -330,6 +337,14 @@ protected:
     return python::SWIGBridge::ToSWIGWrapper(arg);
   }
 
+  python::PythonObject Transform(Event *arg) {
+    return python::SWIGBridge::ToSWIGWrapper(arg);
+  }
+
+  python::PythonObject Transform(Stream *arg) {
+    return python::SWIGBridge::ToSWIGWrapper(arg);
+  }
+
   python::PythonObject Transform(lldb::DataExtractorSP arg) {
     return python::SWIGBridge::ToSWIGWrapper(arg);
   }
@@ -428,6 +443,14 @@ Status ScriptedPythonInterface::ExtractValueFromPythonObject<Status>(
     python::PythonObject &p, Status &error);
 
 template <>
+Event *ScriptedPythonInterface::ExtractValueFromPythonObject<Event *>(
+    python::PythonObject &p, Status &error);
+
+template <>
+Stream *ScriptedPythonInterface::ExtractValueFromPythonObject<Stream *>(
+    python::PythonObject &p, Status &error);
+
+template <>
 lldb::BreakpointSP
 ScriptedPythonInterface::ExtractValueFromPythonObject<lldb::BreakpointSP>(
     python::PythonObject &p, Status &error);