[lldb/Commands] Add `scripting template list` command with auto discovery (#97273)

This patch introduces a new `template` multiword sub-command to the
`scripting` top-level command. As the name suggests, this sub-command
operates on scripting templates, and currently has the ability to
automatically discover the various scripting extensions that lldb
supports.

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

1 files changed, 125 insertions, 0 deletions

diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedThreadPlanPythonInterface/ScriptedThreadPlanPythonInterface.cpp b/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedThreadPlanPythonInterface/ScriptedThreadPlanPythonInterface.cpp
new file mode 100644
index 000000000000..ed0cc417de9b
--- /dev/null
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedThreadPlanPythonInterface/ScriptedThreadPlanPythonInterface.cpp
@@ -0,0 +1,125 @@
+//===-- ScriptedThreadPlanPythonInterface.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 "lldb/Core/PluginManager.h"
+#include "lldb/Host/Config.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/lldb-enumerations.h"
+
+#if LLDB_ENABLE_PYTHON
+
+// clang-format off
+// LLDB Python header must be included first
+#include "../../lldb-python.h"
+//clang-format on
+
+#include "../../SWIGPythonBridge.h"
+#include "../../ScriptInterpreterPythonImpl.h"
+#include "ScriptedThreadPlanPythonInterface.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::python;
+
+LLDB_PLUGIN_DEFINE(ScriptedThreadPlanPythonInterface)
+
+ScriptedThreadPlanPythonInterface::ScriptedThreadPlanPythonInterface(
+    ScriptInterpreterPythonImpl &interpreter)
+    : ScriptedThreadPlanInterface(), ScriptedPythonInterface(interpreter) {}
+
+llvm::Expected<StructuredData::GenericSP>
+ScriptedThreadPlanPythonInterface::CreatePluginObject(
+    const llvm::StringRef class_name, lldb::ThreadPlanSP thread_plan_sp,
+    const StructuredDataImpl &args_sp) {
+  return ScriptedPythonInterface::CreatePluginObject(class_name, nullptr,
+                                                     thread_plan_sp, args_sp);
+}
+
+llvm::Expected<bool>
+ScriptedThreadPlanPythonInterface::ExplainsStop(Event *event) {
+  Status error;
+  StructuredData::ObjectSP obj = Dispatch("explains_stop", error, event);
+
+  if (!ScriptedInterface::CheckStructuredDataObject(LLVM_PRETTY_FUNCTION, obj,
+                                                    error)) {
+    if (!obj)
+      return false;
+    return error.ToError();
+  }
+
+  return obj->GetBooleanValue();
+}
+
+llvm::Expected<bool>
+ScriptedThreadPlanPythonInterface::ShouldStop(Event *event) {
+  Status error;
+  StructuredData::ObjectSP obj = Dispatch("should_stop", error, event);
+
+  if (!ScriptedInterface::CheckStructuredDataObject(LLVM_PRETTY_FUNCTION, obj,
+                                                    error)) {
+    if (!obj)
+      return false;
+    return error.ToError();
+  }
+
+  return obj->GetBooleanValue();
+}
+
+llvm::Expected<bool> ScriptedThreadPlanPythonInterface::IsStale() {
+  Status error;
+  StructuredData::ObjectSP obj = Dispatch("is_stale", error);
+
+  if (!ScriptedInterface::CheckStructuredDataObject(LLVM_PRETTY_FUNCTION, obj,
+                                                    error)) {
+    if (!obj)
+      return false;
+    return error.ToError();
+  }
+
+  return obj->GetBooleanValue();
+}
+
+lldb::StateType ScriptedThreadPlanPythonInterface::GetRunState() {
+  Status error;
+  StructuredData::ObjectSP obj = Dispatch("should_step", error);
+
+  if (!ScriptedInterface::CheckStructuredDataObject(LLVM_PRETTY_FUNCTION, obj,
+                                                    error))
+    return lldb::eStateStepping;
+
+  return static_cast<lldb::StateType>(obj->GetUnsignedIntegerValue(
+      static_cast<uint32_t>(lldb::eStateStepping)));
+}
+
+llvm::Error
+ScriptedThreadPlanPythonInterface::GetStopDescription(lldb::StreamSP &stream) {
+  Status error;
+  Dispatch("stop_description", error, stream);
+
+  if (error.Fail())
+    return error.ToError();
+
+  return llvm::Error::success();
+}
+
+void ScriptedThreadPlanPythonInterface::Initialize() {
+  const std::vector<llvm::StringRef> ci_usages = {
+      "thread step-scripted -C <script-name> [-k key -v value ...]"};
+  const std::vector<llvm::StringRef> api_usages = {
+      "SBThread.StepUsingScriptedThreadPlan"};
+  PluginManager::RegisterPlugin(
+      GetPluginNameStatic(),
+      llvm::StringRef("Alter thread stepping logic and stop reason"),
+      CreateInstance, eScriptLanguagePython, {ci_usages, api_usages});
+}
+
+void ScriptedThreadPlanPythonInterface::Terminate() {
+  PluginManager::UnregisterPlugin(CreateInstance);
+}
+
+#endif