Revert "[lldb] Limit Py_buffer_RAII to SWIG < 4.1" (#167934)

Reverts #167808

Author: JDevlieghere

lldb/bindings/python/python-typemaps.h

@@ -0,0 +1,19 @@
+#ifndef LLDB_BINDINGS_PYTHON_PYTHON_TYPEMAPS_H
+#define LLDB_BINDINGS_PYTHON_PYTHON_TYPEMAPS_H
+
+#include <Python.h>
+
+// Defined here instead of a .swig file because SWIG 2 doesn't support
+// explicit deleted functions.
+struct Py_buffer_RAII {
+  Py_buffer buffer = {};
+  Py_buffer_RAII(){};
+  Py_buffer &operator=(const Py_buffer_RAII &) = delete;
+  Py_buffer_RAII(const Py_buffer_RAII &) = delete;
+  ~Py_buffer_RAII() {
+    if (buffer.obj)
+      PyBuffer_Release(&buffer);
+  }
+};
+
+#endif // LLDB_BINDINGS_PYTHON_PYTHON_TYPEMAPS_H

lldb/bindings/python/python-typemaps.swig

@@ -6,6 +6,12 @@ AND call SWIG_fail at the same time, because it will result in a double free.
 
 */
 
+%inline %{
+
+#include "../bindings/python/python-typemaps.h"
+
+%}
+
 %typemap(in) char ** {
   /* Check if is a list  */
   if (PythonList::Check($input)) {
@@ -628,21 +634,12 @@ template <> bool SetNumberFromPyObject<double>(double &number, PyObject *obj) {
   }
 }
 
-#if SWIG_VERSION < 0x040100
-// The two pybuffer macros below are copied out of swig/Lib/python/pybuffer.i,
+// These two pybuffer macros are copied out of swig/Lib/python/pybuffer.i,
 // and fixed so they will not crash if PyObject_GetBuffer fails.
 // https://github.com/swig/swig/issues/1640
-
-struct Py_buffer_RAII {
-  Py_buffer buffer = {};
-  Py_buffer_RAII(){};
-  Py_buffer &operator=(const Py_buffer_RAII &) = delete;
-  Py_buffer_RAII(const Py_buffer_RAII &) = delete;
-  ~Py_buffer_RAII() {
-    if (buffer.obj)
-      PyBuffer_Release(&buffer);
-  }
-};
+//
+// I've also moved the call to PyBuffer_Release to the end of the SWIG wrapper,
+// doing it right away is not legal according to the python buffer protocol.
 
 %define %pybuffer_mutable_binary(TYPEMAP, SIZE)
 %typemap(in) (TYPEMAP, SIZE) (Py_buffer_RAII view) {
@@ -677,9 +674,6 @@ struct Py_buffer_RAII {
   $2 = ($2_ltype)(size / sizeof($*1_type));
 }
 %enddef
-#else
-%include <pybuffer.i>
-#endif
 
 %pybuffer_binary(const uint8_t *buf, size_t num_bytes);
 %pybuffer_mutable_binary(uint8_t *buf, size_t num_bytes);