Reorganize upb file structure
This change moves almost everything in the `upb/` directory up one level, so
that for example `upb/upb/generated_code_support.h` becomes just
`upb/generated_code_support.h`. The only exceptions I made to this were that I
left `upb/cmake` and `upb/BUILD` where they are, mostly because that avoids
conflict with other files and the current locations seem reasonable for now.
The `python/` directory is a little bit of a challenge because we had to merge
the existing directory there with `upb/python/`. I made `upb/python/BUILD` into
the BUILD file for the merged directory, and it effectively loads the contents
of the other BUILD file via `python/build_targets.bzl`, but I plan to clean
this up soon.
PiperOrigin-RevId: 568651768
diff --git a/python/descriptor.h b/python/descriptor.h
new file mode 100644
index 0000000..7fa0164
--- /dev/null
+++ b/python/descriptor.h
@@ -0,0 +1,85 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2023 Google LLC. All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google LLC nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef PYUPB_DESCRIPTOR_H__
+#define PYUPB_DESCRIPTOR_H__
+
+#include <stdbool.h>
+
+#include "python/python_api.h"
+#include "upb/reflection/def.h"
+
+typedef enum {
+ kPyUpb_Descriptor = 0,
+ kPyUpb_EnumDescriptor = 1,
+ kPyUpb_EnumValueDescriptor = 2,
+ kPyUpb_FieldDescriptor = 3,
+ kPyUpb_FileDescriptor = 4,
+ kPyUpb_MethodDescriptor = 5,
+ kPyUpb_OneofDescriptor = 6,
+ kPyUpb_ServiceDescriptor = 7,
+ kPyUpb_Descriptor_Count = 8,
+} PyUpb_DescriptorType;
+
+// Given a descriptor object |desc|, returns a Python message class object for
+// the msgdef |m|, which must be from the same pool.
+PyObject* PyUpb_Descriptor_GetClass(const upb_MessageDef* m);
+
+// Set the message descriptor's meta class.
+void PyUpb_Descriptor_SetClass(PyObject* py_descriptor, PyObject* meta);
+
+// Returns a Python wrapper object for the given def. This will return an
+// existing object if one already exists, otherwise a new object will be
+// created. The caller always owns a ref on the returned object.
+PyObject* PyUpb_Descriptor_Get(const upb_MessageDef* msgdef);
+PyObject* PyUpb_EnumDescriptor_Get(const upb_EnumDef* enumdef);
+PyObject* PyUpb_FieldDescriptor_Get(const upb_FieldDef* field);
+PyObject* PyUpb_FileDescriptor_Get(const upb_FileDef* file);
+PyObject* PyUpb_OneofDescriptor_Get(const upb_OneofDef* oneof);
+PyObject* PyUpb_EnumValueDescriptor_Get(const upb_EnumValueDef* enumval);
+PyObject* PyUpb_Descriptor_GetOrCreateWrapper(const upb_MessageDef* msg);
+PyObject* PyUpb_ServiceDescriptor_Get(const upb_ServiceDef* s);
+PyObject* PyUpb_MethodDescriptor_Get(const upb_MethodDef* s);
+
+// Returns the underlying |def| for a given wrapper object. The caller must
+// have already verified that the given Python object is of the expected type.
+const upb_FileDef* PyUpb_FileDescriptor_GetDef(PyObject* file);
+const upb_FieldDef* PyUpb_FieldDescriptor_GetDef(PyObject* file);
+const upb_MessageDef* PyUpb_Descriptor_GetDef(PyObject* _self);
+const void* PyUpb_AnyDescriptor_GetDef(PyObject* _self);
+
+// Returns the underlying |def| for a given wrapper object. The caller must
+// have already verified that the given Python object is of the expected type.
+const upb_FileDef* PyUpb_FileDescriptor_GetDef(PyObject* file);
+
+// Module-level init.
+bool PyUpb_InitDescriptor(PyObject* m);
+
+#endif // PYUPB_DESCRIPTOR_H__
