[lldb/Interpreter] Introduce ScriptedPlatform{,Python}Interface

This patch introduces both the ScriptedPlatformInterface and the
ScriptedPlatformPythonInterface. As the name suggests, these calls will
be used to call into the Scripted Platform python implementation from
the C++ Scripted Platform plugin instance.

Differential Revision: https://reviews.llvm.org/D139251

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

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

@@ -0,0 +1,108 @@
+//===-- ScriptedPlatformPythonInterface.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/Host/Config.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/Status.h"
+#include "lldb/lldb-enumerations.h"
+
+#if LLDB_ENABLE_PYTHON
+
+// LLDB Python header must be included first
+#include "lldb-python.h"
+
+#include "SWIGPythonBridge.h"
+#include "ScriptInterpreterPythonImpl.h"
+#include "ScriptedPlatformPythonInterface.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::python;
+using Locker = ScriptInterpreterPythonImpl::Locker;
+
+ScriptedPlatformPythonInterface::ScriptedPlatformPythonInterface(
+    ScriptInterpreterPythonImpl &interpreter)
+    : ScriptedPlatformInterface(), ScriptedPythonInterface(interpreter) {}
+
+StructuredData::GenericSP ScriptedPlatformPythonInterface::CreatePluginObject(
+    llvm::StringRef class_name, ExecutionContext &exe_ctx,
+    StructuredData::DictionarySP args_sp, StructuredData::Generic *script_obj) {
+  if (class_name.empty())
+    return {};
+
+  StructuredDataImpl args_impl(args_sp);
+  std::string error_string;
+
+  Locker py_lock(&m_interpreter, Locker::AcquireLock | Locker::NoSTDIN,
+                 Locker::FreeLock);
+
+  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)));
+
+  return m_object_instance_sp;
+}
+
+StructuredData::DictionarySP ScriptedPlatformPythonInterface::ListProcesses() {
+  Status error;
+  StructuredData::DictionarySP dict_sp =
+      Dispatch<StructuredData::DictionarySP>("list_processes", error);
+
+  if (!dict_sp || !dict_sp->IsValid() || error.Fail()) {
+    return ScriptedInterface::ErrorWithMessage<StructuredData::DictionarySP>(
+        LLVM_PRETTY_FUNCTION,
+        llvm::Twine("Null or invalid object (" +
+                    llvm::Twine(error.AsCString()) + llvm::Twine(")."))
+            .str(),
+        error);
+  }
+
+  return dict_sp;
+}
+
+StructuredData::DictionarySP
+ScriptedPlatformPythonInterface::GetProcessInfo(lldb::pid_t pid) {
+  Status error;
+  StructuredData::DictionarySP dict_sp =
+      Dispatch<StructuredData::DictionarySP>("get_process_info", error, pid);
+
+  if (!dict_sp || !dict_sp->IsValid() || error.Fail()) {
+    return ScriptedInterface::ErrorWithMessage<StructuredData::DictionarySP>(
+        LLVM_PRETTY_FUNCTION,
+        llvm::Twine("Null or invalid object (" +
+                    llvm::Twine(error.AsCString()) + llvm::Twine(")."))
+            .str(),
+        error);
+  }
+
+  return dict_sp;
+}
+
+Status ScriptedPlatformPythonInterface::AttachToProcess(
+    ProcessAttachInfoSP attach_info) {
+  // FIXME: Pass `attach_info` to method call
+  return GetStatusFromMethod("attach_to_process");
+}
+
+Status ScriptedPlatformPythonInterface::LaunchProcess(
+    ProcessLaunchInfoSP launch_info) {
+  // FIXME: Pass `launch_info` to method call
+  return GetStatusFromMethod("launch_process");
+}
+
+Status ScriptedPlatformPythonInterface::KillProcess(lldb::pid_t pid) {
+  return GetStatusFromMethod("kill_process", pid);
+}
+
+#endif // LLDB_ENABLE_PYTHON