Add support for None, True & False

bschoenmaeckers · bschoenmaeckers · commit 7ea97d114b9a · 2026-04-07T21:01:31.000+02:00
diff --git a/crates/capi/src/object.rs b/crates/capi/src/object.rs
@@ -3,7 +3,8 @@ use crate::pystate::with_vm;
 use core::ffi::c_ulong;
 use rustpython_vm::builtins::PyType;
 use rustpython_vm::convert::IntoObject;
-use rustpython_vm::{Context, Py};
+use rustpython_vm::{AsObject, Context, Py};
+use std::ffi::c_uint;
 use std::mem::MaybeUninit;
 
 const PY_TPFLAGS_LONG_SUBCLASS: c_ulong = 1 << 24;
@@ -109,7 +110,16 @@ pub extern "C" fn PyObject_Str(_obj: *mut PyObject) -> *mut PyObject {
 }
 
 #[unsafe(no_mangle)]
-pub extern "C" fn Py_GetConstantBorrowed(_constant_id: core::ffi::c_uint) -> *mut PyObject {
-    crate::log_stub("Py_GetConstantBorrowed");
-    std::ptr::null_mut()
+pub extern "C" fn Py_GetConstantBorrowed(constant_id: c_uint) -> *mut PyObject {
+    with_vm(|vm| {
+        let ctx = &vm.ctx;
+        match constant_id {
+            0 => ctx.none.as_object(),
+            1 => ctx.true_value.as_object(),
+            2 => ctx.true_value.as_object(),
+            _ => panic!("Invalid constant_id passed to Py_GetConstantBorrowed"),
+        }
+        .as_raw()
+        .cast_mut()
+    })
 }
diff --git a/example_projects/pyo3_embed/src/main.rs b/example_projects/pyo3_embed/src/main.rs
@@ -1,5 +1,11 @@
 use pyo3::prelude::*;
-use pyo3::types::{PyInt, PyString};
+use pyo3::types::{PyInt, PyNone, PyString};
+
+
+#[pyfunction]
+fn python_function(py: Python<'_>) -> Borrowed<'_, '_, PyNone> {
+    PyNone::get(py)
+}
 
 fn main() {
     Python::initialize();
@@ -25,6 +31,8 @@ fn main() {
         .join()
         .unwrap();
 
+        assert!(python_function(py).is_none());
+
         PyResult::Ok(())
     })
     .unwrap();
