[lldb] Reimplment PyRun_SimpleString using the Python stable C API (#151777)

Reimplment `PyRun_SimpleString` using the Python stable C API and the
`RunString` helper.

Part of https://github.com/llvm/llvm-project/issues/151617

4 files changed, 42 insertions, 25 deletions

diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp b/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
index 9fe2824..42dc579 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
@@ -1492,6 +1492,22 @@ PyObject *RunString(const char *str, int start, PyObject *globals,
 
   return result;
 }
+
+int RunSimpleString(const char *str) {
+  PyObject *main_module = PyImport_AddModule("__main__");
+  if (!main_module)
+    return -1;
+
+  PyObject *globals = PyModule_GetDict(main_module);
+  if (!globals)
+    return -1;
+
+  PyObject *result = RunString(str, Py_file_input, globals, globals);
+  if (!result)
+    return -1;
+
+  return 0;
+}
 } // namespace python
 } // namespace lldb_private
 
diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h b/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h
index 6a5dd43..0c484b1 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h
@@ -782,6 +782,7 @@ private:
 
 PyObject *RunString(const char *str, int start, PyObject *globals,
                     PyObject *locals);
+int RunSimpleString(const char *str);
 
 } // namespace python
 } // namespace lldb_private
diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
index ce77569..300518f2 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
@@ -420,13 +420,13 @@ ScriptInterpreterPythonImpl::ScriptInterpreterPythonImpl(Debugger &debugger)
   run_string.Printf("%s = dict()", m_dictionary_name.c_str());
 
   Locker locker(this, Locker::AcquireLock, Locker::FreeAcquiredLock);
-  PyRun_SimpleString(run_string.GetData());
+  RunSimpleString(run_string.GetData());
 
   run_string.Clear();
   run_string.Printf(
       "run_one_line (%s, 'import copy, keyword, os, re, sys, uuid, lldb')",
       m_dictionary_name.c_str());
-  PyRun_SimpleString(run_string.GetData());
+  RunSimpleString(run_string.GetData());
 
   // Reloading modules requires a different syntax in Python 2 and Python 3.
   // This provides a consistent syntax no matter what version of Python.
@@ -434,7 +434,7 @@ ScriptInterpreterPythonImpl::ScriptInterpreterPythonImpl(Debugger &debugger)
   run_string.Printf(
       "run_one_line (%s, 'from importlib import reload as reload_module')",
       m_dictionary_name.c_str());
-  PyRun_SimpleString(run_string.GetData());
+  RunSimpleString(run_string.GetData());
 
   // WARNING: temporary code that loads Cocoa formatters - this should be done
   // on a per-platform basis rather than loading the whole set and letting the
@@ -444,20 +444,20 @@ ScriptInterpreterPythonImpl::ScriptInterpreterPythonImpl(Debugger &debugger)
   run_string.Printf(
       "run_one_line (%s, 'import lldb.formatters, lldb.formatters.cpp')",
       m_dictionary_name.c_str());
-  PyRun_SimpleString(run_string.GetData());
+  RunSimpleString(run_string.GetData());
   run_string.Clear();
 
   run_string.Printf("run_one_line (%s, 'import lldb.embedded_interpreter; from "
                     "lldb.embedded_interpreter import run_python_interpreter; "
                     "from lldb.embedded_interpreter import run_one_line')",
                     m_dictionary_name.c_str());
-  PyRun_SimpleString(run_string.GetData());
+  RunSimpleString(run_string.GetData());
   run_string.Clear();
 
   run_string.Printf("run_one_line (%s, 'lldb.debugger_unique_id = %" PRIu64
                     "')",
                     m_dictionary_name.c_str(), m_debugger.GetID());
-  PyRun_SimpleString(run_string.GetData());
+  RunSimpleString(run_string.GetData());
 }
 
 ScriptInterpreterPythonImpl::~ScriptInterpreterPythonImpl() {
@@ -572,8 +572,8 @@ void ScriptInterpreterPythonImpl::LeaveSession() {
     log->PutCString("ScriptInterpreterPythonImpl::LeaveSession()");
 
   // Unset the LLDB global variables.
-  PyRun_SimpleString("lldb.debugger = None; lldb.target = None; lldb.process "
-                     "= None; lldb.thread = None; lldb.frame = None");
+  RunSimpleString("lldb.debugger = None; lldb.target = None; lldb.process "
+                  "= None; lldb.thread = None; lldb.frame = None");
 
   // checking that we have a valid thread state - since we use our own
   // threading and locking in some (rare) cases during cleanup Python may end
@@ -674,7 +674,7 @@ bool ScriptInterpreterPythonImpl::EnterSession(uint16_t on_entry_flags,
     run_string.PutCString("')");
   }
 
-  PyRun_SimpleString(run_string.GetData());
+  RunSimpleString(run_string.GetData());
   run_string.Clear();
 
   PythonDictionary &sys_module_dict = GetSysModuleDictionary();
@@ -816,9 +816,9 @@ bool ScriptInterpreterPythonImpl::ExecuteOneLine(
 
   if (!command.empty()) {
     // We want to call run_one_line, passing in the dictionary and the command
-    // string.  We cannot do this through PyRun_SimpleString here because the
+    // string.  We cannot do this through RunSimpleString here because the
     // command string may contain escaped characters, and putting it inside
-    // another string to pass to PyRun_SimpleString messes up the escaping.  So
+    // another string to pass to RunSimpleString messes up the escaping.  So
     // we use the following more complicated method to pass the command string
     // directly down to Python.
     llvm::Expected<std::unique_ptr<ScriptInterpreterIORedirect>>
@@ -3057,7 +3057,7 @@ void ScriptInterpreterPythonImpl::Initialize() {
   // Update the path python uses to search for modules to include the current
   // directory.
 
-  PyRun_SimpleString("import sys");
+  RunSimpleString("import sys");
   AddToSysPath(AddLocation::End, ".");
 
   // Don't denormalize paths when calling file_spec.GetPath().  On platforms
@@ -3069,10 +3069,10 @@ void ScriptInterpreterPythonImpl::Initialize() {
   if (FileSpec file_spec = HostInfo::GetShlibDir())
     AddToSysPath(AddLocation::Beginning, file_spec.GetPath(false));
 
-  PyRun_SimpleString("sys.dont_write_bytecode = 1; import "
-                     "lldb.embedded_interpreter; from "
-                     "lldb.embedded_interpreter import run_python_interpreter; "
-                     "from lldb.embedded_interpreter import run_one_line");
+  RunSimpleString("sys.dont_write_bytecode = 1; import "
+                  "lldb.embedded_interpreter; from "
+                  "lldb.embedded_interpreter import run_python_interpreter; "
+                  "from lldb.embedded_interpreter import run_one_line");
 
 #if LLDB_USE_PYTHON_SET_INTERRUPT
   // Python will not just overwrite its internal SIGINT handler but also the
@@ -3084,13 +3084,13 @@ void ScriptInterpreterPythonImpl::Initialize() {
   // normal Python REPL signal handler which raises a KeyboardInterrupt.
   // Also make sure to not pollute the user's REPL with the signal module nor
   // our utility function.
-  PyRun_SimpleString("def lldb_setup_sigint_handler():\n"
-                     "  import signal;\n"
-                     "  def signal_handler(sig, frame):\n"
-                     "    raise KeyboardInterrupt()\n"
-                     "  signal.signal(signal.SIGINT, signal_handler);\n"
-                     "lldb_setup_sigint_handler();\n"
-                     "del lldb_setup_sigint_handler\n");
+  RunSimpleString("def lldb_setup_sigint_handler():\n"
+                  "  import signal;\n"
+                  "  def signal_handler(sig, frame):\n"
+                  "    raise KeyboardInterrupt()\n"
+                  "  signal.signal(signal.SIGINT, signal_handler);\n"
+                  "lldb_setup_sigint_handler();\n"
+                  "del lldb_setup_sigint_handler\n");
 #endif
 }
 
@@ -3106,7 +3106,7 @@ void ScriptInterpreterPythonImpl::AddToSysPath(AddLocation location,
     statement.append(path);
     statement.append("\")");
   }
-  PyRun_SimpleString(statement.c_str());
+  RunSimpleString(statement.c_str());
 }
 
 // We are intentionally NOT calling Py_Finalize here (this would be the logical
diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPythonImpl.h b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPythonImpl.h
index 4698b82a..83b64b8 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPythonImpl.h
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPythonImpl.h
@@ -475,7 +475,7 @@ public:
         StreamString run_string;
         run_string.Printf("run_python_interpreter (%s)",
                           m_python->GetDictionaryName());
-        PyRun_SimpleString(run_string.GetData());
+        python::RunSimpleString(run_string.GetData());
       }
     }
     SetIsDone(true);