Add basic module functions to c-api (#8032)

crates/capi/src/lib.rs

@@ -20,6 +20,7 @@ pub mod import;
 pub mod listobject;
 pub mod longobject;
 pub mod methodobject;
+pub mod moduleobject;
 pub mod object;
 pub mod pycapsule;
 pub mod pyerrors;

crates/capi/src/moduleobject.rs

@@ -0,0 +1,42 @@
+use crate::PyObject;
+use crate::object::define_py_check;
+use crate::pystate::with_vm;
+use rustpython_vm::builtins::{PyModule, PyStr};
+
+define_py_check!(fn PyModule_Check, types.module_type);
+define_py_check!(exact fn PyModule_CheckExact, types.module_type);
+
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn PyModule_GetNameObject(module: *mut PyObject) -> *mut PyObject {
+    with_vm(|vm| {
+        let module = unsafe { &*module }.try_downcast_ref::<PyModule>(vm)?;
+        let dict = module.dict();
+        let name = dict
+            .get_item_opt(rustpython_vm::identifier!(vm, __name__), vm)?
+            .and_then(|obj| obj.downcast_ref::<PyStr>().map(ToOwned::to_owned));
+        name.ok_or_else(|| vm.new_system_error("nameless module"))
+    })
+}
+
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn PyModule_GetFilenameObject(module: *mut PyObject) -> *mut PyObject {
+    with_vm(|vm| {
+        let module = unsafe { &*module }.try_downcast_ref::<PyModule>(vm)?;
+        let dict = module.dict();
+        let filename = dict
+            .get_item_opt(rustpython_vm::identifier!(vm, __file__), vm)?
+            .and_then(|obj| obj.downcast_ref::<PyStr>().map(ToOwned::to_owned));
+        filename.ok_or_else(|| vm.new_system_error("module filename missing"))
+    })
+}
+
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn PyModule_NewObject(name: *mut PyObject) -> *mut PyObject {
+    with_vm(|vm| -> rustpython_vm::PyResult<_> {
+        let name = unsafe { &*name }.try_downcast_ref::<PyStr>(vm)?;
+        let name = name
+            .to_str()
+            .ok_or_else(|| vm.new_system_error("module name must be valid UTF-8"))?;
+        Ok(vm.new_module(name, vm.ctx.new_dict(), None))
+    })
+}