Author: Jonas Devlieghere
Date: 2025-08-08T15:57:58-05:00
New Revision: 412ea0b675522fd161382d5ce437e51f0505337a

URL: 
https://github.com/llvm/llvm-project/commit/412ea0b675522fd161382d5ce437e51f0505337a
DIFF: 
https://github.com/llvm/llvm-project/commit/412ea0b675522fd161382d5ce437e51f0505337a.diff

LOG: [lldb] Support the Python stable C API in PythonString::AsUTF8 (#152599)

This conditionally reimplements PythonString::AsUTF8 using
PyUnicode_AsUTF8String instead of PyUnicode_AsUTF8AndSize.

PyUnicode_AsUTF8AndSize caches the UTF-8 representation of the string in
the Unicode object, which makes it more efficient and ties the lifetime
of the data to the Python string. However, it was only added to the
Stable API in Python 3.10. Older versions that want to use the Stable
API must use PyUnicode_AsUTF8String in combination with ConstString.

Added: 
    

Modified: 
    lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp

Removed: 
    


################################################################################
diff  --git 
a/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp 
b/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
index 27ac54322165e..a2a287a6714db 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
@@ -405,15 +405,33 @@ Expected<llvm::StringRef> PythonString::AsUTF8() const {
   if (!IsValid())
     return nullDeref();
 
-  Py_ssize_t size;
-  const char *data;
+  // PyUnicode_AsUTF8AndSize caches the UTF-8 representation of the string in
+  // the Unicode object, which makes it more efficient and ties the lifetime of
+  // the data to the Python string. However, it was only added to the Stable 
API
+  // in Python 3.10. Older versions that want to use the Stable API must use
+  // PyUnicode_AsUTF8String in combination with ConstString.
+#if defined(Py_LIMITED_API) && (Py_LIMITED_API < 0x030a0000)
+  PyObject *py_bytes = PyUnicode_AsUTF8String(m_py_obj);
+  if (!py_bytes)
+    return exception();
+  auto release_py_str =
+      llvm::make_scope_exit([py_bytes] { Py_DECREF(py_bytes); });
+  Py_ssize_t size = PyBytes_Size(py_bytes);
+  const char *str = PyBytes_AsString(py_bytes);
+
+  if (!str)
+    return exception();
 
-  data = PyUnicode_AsUTF8AndSize(m_py_obj, &size);
+  return ConstString(str, size).GetStringRef();
+#else
+  Py_ssize_t size;
+  const char *str = PyUnicode_AsUTF8AndSize(m_py_obj, &size);
 
-  if (!data)
+  if (!str)
     return exception();
 
-  return llvm::StringRef(data, size);
+  return llvm::StringRef(str, size);
+#endif
 }
 
 size_t PythonString::GetSize() const {


        
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