]> asedeno.scripts.mit.edu Git - cl-protobufs.git/blobdiff - serialize.lisp
asdf-support: simplify do-process-import internals
[cl-protobufs.git] / serialize.lisp
index 595df40c863a5ed0de8d1a0c65be1e9f831ea20d..cb48a1424ace8582c78a2be7772f293f886c6c35 100644 (file)
@@ -2,7 +2,7 @@
 ;;;                                                                  ;;;
 ;;; Free Software published under an MIT-like license. See LICENSE   ;;;
 ;;;                                                                  ;;;
-;;; Copyright (c) 2012 Google, Inc.  All rights reserved.            ;;;
+;;; Copyright (c) 2012-2013 Google, Inc.  All rights reserved.       ;;;
 ;;;                                                                  ;;;
 ;;; Original author: Scott McKay                                     ;;;
 ;;;                                                                  ;;;
 
 ;;; Protobuf serialization from Lisp objects
 
+;;; Size caches
+
+(defgeneric make-size-cache (object type)
+  (:documentation
+   "Make an object size cache for 'object'."))
+
+;; Note that this gets called on the top-level object being serialized
+;; This means that either all the objects in the tree should be subclasses
+;; of 'base-protobuf-message', or none of them should be. If the root is
+;; not a 'base-protobuf-message', then things will work but be slower; if
+;; the root is a 'base-protobuf-message', but some children are not, then
+;; serialization will fail.
+(defmethod make-size-cache ((object standard-object) type)
+  (declare (ignore type))
+  ;; No '%cached-size' slot in standard objects, create a "visited" table
+  (make-hash-table))
+
+(defmethod make-size-cache ((object base-protobuf-message) type)
+  ;; In classes defined by Protobufs, we will use the '%cached-size' slot
+  ;; This clears the size cache for the tree of objects
+  (clear-size-cache object type)
+  nil)
+
+
+(declaim (inline cached-object-size))
+(defun cached-object-size (object visited)
+  (declare #.$optimize-fast-unsafe)
+  (if visited
+    (gethash object visited)
+    ;; Warning, Will Robinson! Danger!
+    ;; If there's no 'visited' table, assume there's a cached size slot.
+    ;; We should use methods speciaized on 'base-protobuf-message',
+    ;; but we're trying to max out the speed.
+    (slot-value object '%cached-size)))
+
+(defun (setf cached-object-size) (size object visited)
+  (declare #.$optimize-fast-unsafe)
+  (if visited
+    (setf (gethash object visited) size)
+    (setf (slot-value object '%cached-size) size)))
+
+
+(defgeneric clear-size-cache (object type)
+  (:documentation
+   "Clear the size cache for a tree of objects."))
+
+(defmethod clear-size-cache ((object standard-object) type)
+  (declare (ignore type))
+  nil)
+
+(defmethod clear-size-cache ((object base-protobuf-message) type)
+  (let ((message (find-message-for-class type)))
+    (assert message ()
+            "There is no Protobuf message having the type ~S" type)
+    (macrolet ((read-slot (object slot reader)
+                 `(if ,reader
+                    (funcall ,reader ,object)
+                    (slot-value ,object ,slot))))
+      (labels ((do-field (object trace field)
+                 (let* ((type   (if (eq (proto-class field) 'boolean) :bool (proto-class field)))
+                        (slot   (proto-value field))
+                        (reader (proto-reader field))
+                        msg)
+                   (when (or slot reader)
+                     (cond ((eq (proto-required field) :repeated)
+                            (cond ((or (and (proto-packed field) (packed-type-p type))
+                                       (keywordp type)))
+                                  ((typep (setq msg (and type (find-message trace type))) 'protobuf-message)
+                                   (setf (slot-value object '%cached-size) nil)
+                                   (doseq (v (if slot (read-slot object slot reader) (list object)))
+                                     (dolist (f (proto-fields msg))
+                                       (do-field v msg f))))))
+                           (t
+                            (cond ((keywordp type))
+                                  ((typep (setq msg (and type (find-message trace type))) 'protobuf-message)
+                                   (setf (slot-value object '%cached-size) nil)
+                                   (let ((v (if slot (read-slot object slot reader) object)))
+                                     (when v
+                                       (dolist (f (proto-fields msg))
+                                         (do-field v msg f))))))))))))
+          (declare (dynamic-extent #'do-field))
+          (setf (slot-value object '%cached-size) nil)
+          (dolist (field (proto-fields message))
+            (do-field object message field))
+          nil))))
+
+
 ;;; Serialization
 
 (defun serialize-object-to-file (filename object type &key visited)
    'type' is the Lisp name of a Protobufs message (usually the name of a 
    Lisp class) or a 'protobuf-message'.
    'visited' is a hash table used to cache object sizes. If it is supplied, it will be
-   cleared before it is used; otherwise, a fresh table will be created.
+   cleared before it is used; otherwise, a fresh table will be created if necessary.
    The return value is the buffer containing the serialized object. If the stream is
    nil, the buffer is not actually written to anywhere."
-  (let* ((visited (let ((v (or visited (make-hash-table))))
-                    (clrhash v)
+  (let* ((visited (let ((v (or visited (make-size-cache object type))))
+                    (when v (clrhash v))
                     v))
+         ;; Use 'object-size' to forcibly recompute all the sizes
          (size    (object-size object type visited))
          (buffer  (make-byte-vector size)))
     (serialize-object object type buffer 0 visited)
     Lisp class) or a 'protobuf-message'.
     The object is serialized into the byte array given by 'buffer' starting
     at the fixnum index 'index' using the wire format.
-    'visited' is a hash table used to cache object sizes.
+    'visited' is a hash table used to cache object sizes; if this is nil, then
+    the object caches its size itself in a '%cached-size' slot.
     The return value is the buffer containing the serialized object."))
 
 (defmethod serialize-object (object type buffer &optional start visited)
     (serialize-object object message buffer start visited)))
 
 ;; 'visited' is used to cache object sizes
-;; If it's passed in explicitly, it is assumed to already have the sizes within it
+;; If it's non-nil. it must to be a table with the sizes already in it
+;; If it's nil, then the objects must have a '%cached-size' slot
 ;; The default method uses metadata from the protobuf "schema" for the message
 (defmethod serialize-object (object (message protobuf-message) buffer &optional start visited)
   (declare (type (simple-array (unsigned-byte 8)) buffer))
-  (let ((visited (or visited (make-hash-table)))
-        (index   (or start 0)))
+  (let ((index (or start 0)))
     (declare (type fixnum index))
     (macrolet ((read-slot (object slot reader)
                  ;; Don't do a boundp check, we assume the object is fully populated
                                                                    type tag buffer index))))
                                   ((keywordp type)
                                    (let ((tag (make-tag type (proto-index field))))
-                                     (map () #'(lambda (v)
-                                                 (setq index (serialize-prim v type tag buffer index)))
-                                             (read-slot object slot reader))))
+                                     (doseq (v (read-slot object slot reader))
+                                       (setq index (serialize-prim v type tag buffer index)))))
                                   ((typep (setq msg (and type (or (find-message trace type)
                                                                   (find-enum trace type)
                                                                   (find-type-alias trace type))))
                                           'protobuf-message)
                                    (if (eq (proto-message-type msg) :group)
-                                     (map () #'(lambda (v)
-                                                 ;; To serialize a group, we encode a start tag,
-                                                 ;; serialize the fields, then encode an end tag
-                                                 (let ((tag1 (make-tag $wire-type-start-group (proto-index field)))
-                                                       (tag2 (make-tag $wire-type-end-group   (proto-index field))))
-                                                   (setq index (encode-uint32 tag1 buffer index))
-                                                   (map () (curry #'do-field v msg)
-                                                           (proto-fields msg))
-                                                   (setq index (encode-uint32 tag2 buffer index))))
-                                             (if slot (read-slot object slot reader) (list object)))
-                                     (map () #'(lambda (v)
-                                                 ;; To serialize an embedded message, first say that it's
-                                                 ;; a string, then encode its size, then serialize its fields
-                                                 (let ((tag (make-tag $wire-type-string (proto-index field)))
-                                                       (len (object-size v msg visited)))
-                                                   (setq index (encode-uint32 tag buffer index))
-                                                   (setq index (encode-uint32 len buffer index)))
-                                                 (map () (curry #'do-field v msg)
-                                                         (proto-fields msg)))
-                                             (if slot (read-slot object slot reader) (list object)))))
+                                     (doseq (v (if slot (read-slot object slot reader) (list object)))
+                                       ;; To serialize a group, we encode a start tag,
+                                       ;; serialize the fields, then encode an end tag
+                                       (let ((tag1 (make-tag $wire-type-start-group (proto-index field)))
+                                             (tag2 (make-tag $wire-type-end-group   (proto-index field))))
+                                         (setq index (encode-uint32 tag1 buffer index))
+                                         (dolist (f (proto-fields msg))
+                                           (do-field v msg f))
+                                         (setq index (encode-uint32 tag2 buffer index))))
+                                     (doseq (v (if slot (read-slot object slot reader) (list object)))
+                                       ;; To serialize an embedded message, first say that it's
+                                       ;; a string, then encode its size, then serialize its fields
+                                       (let ((tag (make-tag $wire-type-string (proto-index field)))
+                                             (len (cached-object-size v visited)))
+                                         (setq index (encode-uint32 tag buffer index))
+                                         (setq index (encode-uint32 len buffer index)))
+                                       (dolist (f (proto-fields msg))
+                                         (do-field v msg f)))))
                                   ((typep msg 'protobuf-enum)
                                    (let ((tag (make-tag $wire-type-varint (proto-index field))))
                                      ;; 'proto-packed-p' of enum types returns nil,
                                      (if (proto-packed field)
                                        (setq index (serialize-packed-enum (read-slot object slot reader)
                                                                           (proto-values msg) tag buffer index))
-                                       (map () #'(lambda (v)
-                                                   (setq index (serialize-enum v (proto-values msg) tag buffer index)))
-                                               (read-slot object slot reader)))))
+                                       (doseq (v (read-slot object slot reader))
+                                         (setq index (serialize-enum v (proto-values msg) tag buffer index))))))
                                   ((typep msg 'protobuf-type-alias)
                                    (let* ((type (proto-proto-type msg))
                                           (tag  (make-tag type (proto-index field))))
-                                     (map () #'(lambda (v)
-                                                 (let ((v (funcall (proto-serializer msg) v)))
-                                                   (setq index (serialize-prim v type tag buffer index))))
-                                             (read-slot object slot reader))))))
+                                     (doseq (v (read-slot object slot reader))
+                                       (let ((v (funcall (proto-serializer msg) v)))
+                                         (setq index (serialize-prim v type tag buffer index))))))
+                                  (t
+                                   (undefined-field-type "While serializing ~S,"
+                                                         object type field))))
                            (t
                             (cond ((eq type :bool)
                                    ;; We have to handle optional boolean fields specially
                                          (setq index (serialize-prim v type tag buffer index))))))
                                   ((keywordp type)
                                    (let ((v (read-slot object slot reader)))
-                                     (when v
+                                     (when (and v (not (equal v (proto-default field))))
                                        (let ((tag (make-tag type (proto-index field))))
                                          (setq index (serialize-prim v type tag buffer index))))))
                                   ((typep (setq msg (and type (or (find-message trace type)
                                          (let ((tag1 (make-tag $wire-type-start-group (proto-index field)))
                                                (tag2 (make-tag $wire-type-end-group   (proto-index field))))
                                            (setq index (encode-uint32 tag1 buffer index))
-                                           (map () (curry #'do-field v msg)
-                                                   (proto-fields msg))
+                                           (dolist (f (proto-fields msg))
+                                             (do-field v msg f))
                                            (setq index (encode-uint32 tag2 buffer index)))
                                          (let ((tag (make-tag $wire-type-string (proto-index field)))
-                                               (len (object-size v msg visited)))
+                                               (len (cached-object-size v visited)))
                                            (setq index (encode-uint32 tag buffer index))
                                            (setq index (encode-uint32 len buffer index))
-                                           (map () (curry #'do-field v msg)
-                                                   (proto-fields msg)))))))
+                                           (dolist (f (proto-fields msg))
+                                             (do-field v msg f)))))))
                                   ((typep msg 'protobuf-enum)
                                    (let ((v (read-slot object slot reader)))
-                                     (when v
+                                     (when (and v (not (eql v (proto-default field))))
                                        (let ((tag (make-tag $wire-type-varint (proto-index field))))
                                          (setq index (serialize-enum v (proto-values msg) tag buffer index))))))
                                   ((typep msg 'protobuf-type-alias)
                                        (let* ((v    (funcall (proto-serializer msg) v))
                                               (type (proto-proto-type msg))
                                               (tag  (make-tag type (proto-index field))))
-                                         (setq index (serialize-prim v type tag buffer index)))))))))))))
+                                         (setq index (serialize-prim v type tag buffer index))))))
+                                  (t
+                                   (undefined-field-type "While serializing ~S,"
+                                                         object type field)))))))))
         (declare (dynamic-extent #'do-field))
-        (map () (curry #'do-field object message) (proto-fields message))))
+        (dolist (field (proto-fields message))
+          (do-field object message field))))
     (values buffer index)))
 
 
    "Computes the size in bytes of the object 'object' of type 'type'.
     'type' is the Lisp name of a Protobufs message (usually the name of a 
     Lisp class) or a 'protobuf-message'.
-    'visited' is a hash table used to cache object sizes.
+    'visited' is either a hash table used to cache object sizes,
+    or is nil, in which case the objects must have a '%cached-size' slot in them.
     The return value is the size of the object in bytes."))
 
 (defmethod object-size (object type &optional visited)
 ;; 'visited' is used to cache object sizes
 ;; The default method uses metadata from the protobuf "schema" for the message
 (defmethod object-size (object (message protobuf-message) &optional visited)
-  (let ((size (and visited (gethash object visited))))
-    (when size
-      (return-from object-size size)))
   (let ((size 0))
     (declare (type fixnum size))
     (macrolet ((read-slot (object slot reader)
                                      (iincf size (packed-size (read-slot object slot reader) type tag))))
                                   ((keywordp type)
                                    (let ((tag (make-tag type (proto-index field))))
-                                     (map () #'(lambda (v)
-                                                 (iincf size (prim-size v type tag)))
-                                             (read-slot object slot reader))))
+                                     (doseq (v (read-slot object slot reader))
+                                       (iincf size (prim-size v type tag)))))
                                   ((typep (setq msg (and type (or (find-message trace type)
                                                                   (find-enum trace type)
                                                                   (find-type-alias trace type))))
                                           'protobuf-message)
                                    (if (eq (proto-message-type msg) :group)
-                                     (map () #'(lambda (v)
-                                                 (let ((tag1 (make-tag $wire-type-start-group (proto-index field)))
-                                                       (tag2 (make-tag $wire-type-end-group   (proto-index field))))
-                                                   (iincf size (length32 tag1))
-                                                   (map () (curry #'do-field v msg)
-                                                           (proto-fields msg))
-                                                   (iincf size (length32 tag2))))
-                                             (if slot (read-slot object slot reader) (list object)))
-                                     (map () #'(lambda (v)
-                                                 (let ((tag (make-tag $wire-type-string (proto-index field)))
-                                                       (len (object-size v msg visited)))
-                                                   (iincf size (length32 tag))
-                                                   (iincf size (length32 len))
-                                                   (map () (curry #'do-field v msg)
-                                                           (proto-fields msg))))
-                                             (if slot (read-slot object slot reader) (list object)))))
+                                     (doseq (v (if slot (read-slot object slot reader) (list object)))
+                                       (let ((tag1 (make-tag $wire-type-start-group (proto-index field)))
+                                             (tag2 (make-tag $wire-type-end-group   (proto-index field))))
+                                         (iincf size (length32 tag1))
+                                         (dolist (f (proto-fields msg))
+                                           (do-field v msg f))
+                                         (iincf size (length32 tag2))))
+                                     (doseq (v (if slot (read-slot object slot reader) (list object)))
+                                       (let ((tag (make-tag $wire-type-string (proto-index field)))
+                                             (len (or (cached-object-size v visited)
+                                                      (object-size v msg visited))))
+                                         (iincf size (length32 tag))
+                                         (iincf size (length32 len))
+                                         (dolist (f (proto-fields msg))
+                                           (do-field v msg f))))))
                                   ((typep msg 'protobuf-enum)
                                    (let ((tag (make-tag $wire-type-varint (proto-index field))))
                                      (if (proto-packed field)
                                        (iincf size (packed-enum-size (read-slot object slot reader) type tag))
-                                       (map () #'(lambda (v)
-                                                   (iincf size (enum-size v (proto-values msg) tag)))
-                                               (read-slot object slot reader)))))
+                                       (doseq (v (read-slot object slot reader))
+                                         (iincf size (enum-size v (proto-values msg) tag))))))
                                   ((typep msg 'protobuf-type-alias)
                                    (let* ((type (proto-proto-type msg))
                                           (tag  (make-tag type (proto-index field))))
-                                     (map () #'(lambda (v)
-                                                 (let ((v (funcall (proto-serializer msg) v)))
-                                                   (iincf size (prim-size v type tag))))
-                                             (read-slot object slot reader))))))
+                                     (doseq (v (read-slot object slot reader))
+                                       (let ((v (funcall (proto-serializer msg) v)))
+                                         (iincf size (prim-size v type tag))))))
+                                  (t
+                                   (undefined-field-type "While computing the size of ~S,"
+                                                         object type field))))
                            (t
                             (cond ((eq type :bool)
                                    (let ((v (cond ((or (eq (proto-required field) :required)
                                          (iincf size (prim-size v type tag))))))
                                   ((keywordp type)
                                    (let ((v (read-slot object slot reader)))
-                                     (when v
+                                     (when (and v (not (equal v (proto-default field))))
                                        (let ((tag (make-tag type (proto-index field))))
                                          (iincf size (prim-size v type tag))))))
                                   ((typep (setq msg (and type (or (find-message trace type)
                                      (when v
                                        (if (eq (proto-message-type msg) :group)
                                          (let ((tag1 (make-tag $wire-type-start-group (proto-index field)))
-                                             (tag2 (make-tag $wire-type-end-group   (proto-index field))))
+                                               (tag2 (make-tag $wire-type-end-group   (proto-index field))))
                                            (iincf size (length32 tag1))
-                                           (map () (curry #'do-field v msg)
-                                                   (proto-fields msg))
+                                           (dolist (f (proto-fields msg))
+                                             (do-field v msg f))
                                            (iincf size (length32 tag2)))
                                          (let ((tag (make-tag $wire-type-string (proto-index field)))
-                                               (len (object-size v msg visited)))
+                                               (len (or (cached-object-size v visited)
+                                                        (object-size v msg visited))))
                                            (iincf size (length32 tag))
                                            (iincf size (length32 len))
-                                           (map () (curry #'do-field v msg)
-                                                (proto-fields msg)))))))
+                                           (dolist (f (proto-fields msg))
+                                             (do-field v msg f)))))))
                                   ((typep msg 'protobuf-enum)
                                    (let ((v (read-slot object slot reader)))
-                                     (when v
+                                     (when (and v (not (eql v (proto-default field))))
                                        (let ((tag (make-tag $wire-type-varint (proto-index field))))
                                          (iincf size (enum-size (read-slot object slot reader) (proto-values msg) tag))))))
                                   ((typep msg 'protobuf-type-alias)
                                        (let* ((v    (funcall (proto-serializer msg) v))
                                               (type (proto-proto-type msg))
                                               (tag  (make-tag type (proto-index field))))
-                                         (iincf size (prim-size v type tag)))))))))))))
+                                         (iincf size (prim-size v type tag))))))
+                                  (t
+                                   (undefined-field-type "While computing the size of ~S,"
+                                                         object type field)))))))))
         (declare (dynamic-extent #'do-field))
-        (map () (curry #'do-field object message) (proto-fields message))
-        (when visited
-          (setf (gethash object visited) size))   ;cache the size
+        (dolist (field (proto-fields message))
+          (do-field object message field))
+        (setf (cached-object-size object visited) size)          ;cache the size
         size))))
 
 \f
                (index  (proto-index field)))
           (when reader
             (cond ((eq (proto-required field) :repeated)
-                   (let ((iterator (if (vector-field-p field) 'dovector 'dolist)))
+                   (let* ((vectorp  (vector-field-p field))
+                          (iterator (if vectorp 'dovector 'dolist)))
                      (cond ((and (proto-packed field) (packed-type-p class))
                             (collect-serializer
                              (let ((tag (make-tag class index)))
-                               `(setq ,vidx (serialize-packed ,reader ,class ,tag ,vbuf ,vidx)))))
+                               `(setq ,vidx (serialize-packed ,reader ,class ,tag ,vbuf ,vidx
+                                                              ,vectorp)))))
                            ((keywordp class)
                             (collect-serializer
                              (let ((tag (make-tag class index)))
                                (let ((tag1 (make-tag $wire-type-start-group index))
                                      (tag2 (make-tag $wire-type-end-group   index)))
                                  `(,iterator (,vval ,reader)
-                                    (let ((len (or (and visited (gethash ,vval visited))
-                                                   (object-size ,vval ,msg visited))))
+                                    (let ((len (cached-object-size ,vval visited)))
                                       (setq ,vidx (encode-uint32 ,tag1 ,vbuf ,vidx))
                                       (serialize-object ,vval ,msg ,vbuf ,vidx visited)
                                       (iincf ,vidx len)
                                       (setq ,vidx (encode-uint32 ,tag2 ,vbuf ,vidx)))))
                                (let ((tag (make-tag $wire-type-string index)))
                                  `(,iterator (,vval ,reader)
-                                    (let ((len (or (and visited (gethash ,vval visited))
-                                                   (object-size ,vval ,msg visited))))
+                                    (let ((len (cached-object-size ,vval visited)))
                                       (setq ,vidx (encode-uint32 ,tag ,vbuf ,vidx))
                                       (setq ,vidx (encode-uint32 len ,vbuf ,vidx))
                                       (serialize-object ,vval ,msg ,vbuf ,vidx visited)
                             (collect-serializer
                              (let ((tag (make-tag $wire-type-varint index)))
                                (if (proto-packed field)
-                                 `(setq ,vidx (serialize-packed-enum ,reader '(,@(proto-values msg)) ,tag ,vbuf ,vidx))
+                                 `(setq ,vidx (serialize-packed-enum ,reader '(,@(proto-values msg)) ,tag ,vbuf ,vidx
+                                                                     ,vectorp))
 
                                  `(,iterator (,vval ,reader)
                                     (setq ,vidx (serialize-enum ,vval '(,@(proto-values msg)) ,tag ,vbuf ,vidx)))))))
                                     (tag   (make-tag class (proto-index field))))
                                `(,iterator (,vval ,reader)
                                   (let ((,vval (funcall #',(proto-serializer msg) ,vval)))
-                                    (setq ,vidx (serialize-prim ,vval ,class ,tag ,vbuf ,vidx))))))))))
+                                    (setq ,vidx (serialize-prim ,vval ,class ,tag ,vbuf ,vidx)))))))
+                           (t
+                            (undefined-field-type "While generating 'serialize-object' for ~S,"
+                                                  message class field)))))
                   (t
                    (cond ((keywordp class)
                           (collect-serializer
                                                      (t :unbound))))
                                     (unless (eq ,vval :unbound)
                                       (setq ,vidx (serialize-prim ,vval ,class ,tag ,vbuf ,vidx)))))
-                               `(let ((,vval ,reader))
-                                  (when ,vval
-                                    (setq ,vidx (serialize-prim ,vval ,class ,tag ,vbuf ,vidx))))))))
+                               (if (empty-default-p field)
+                                 `(let ((,vval ,reader))
+                                    (when ,vval
+                                      (setq ,vidx (serialize-prim ,vval ,class ,tag ,vbuf ,vidx))))
+                                 `(let ((,vval ,reader))
+                                    (when (and ,vval (not (equal ,vval ',(proto-default field))))
+                                      (setq ,vidx (serialize-prim ,vval ,class ,tag ,vbuf ,vidx)))))))))
                          ((typep msg 'protobuf-message)
                           (collect-serializer
                            (if (eq (proto-message-type msg) :group)
                                    (tag2 (make-tag $wire-type-end-group   index)))
                                `(let ((,vval ,reader))
                                   (when ,vval
-                                    (let ((len (or (and visited (gethash ,vval visited))
-                                                   (object-size ,vval ,msg visited))))
+                                    (let ((len (cached-object-size ,vval visited)))
                                       (setq ,vidx (encode-uint32 ,tag1 ,vbuf ,vidx))
                                       (serialize-object ,vval ,msg ,vbuf ,vidx visited)
                                       (iincf ,vidx len)
                              (let ((tag (make-tag $wire-type-string index)))
                                `(let ((,vval ,reader))
                                   (when ,vval
-                                    (let ((len (or (and visited (gethash ,vval visited))
-                                                   (object-size ,vval ,msg visited))))
+                                    (let ((len (cached-object-size ,vval visited)))
                                       (setq ,vidx (encode-uint32 ,tag ,vbuf ,vidx))
                                       (setq ,vidx (encode-uint32 len ,vbuf ,vidx))
                                       (serialize-object ,vval ,msg ,vbuf ,vidx visited)
                          ((typep msg 'protobuf-enum)
                           (collect-serializer
                            (let ((tag (make-tag $wire-type-varint index)))
-                             `(let ((,vval ,reader))
-                                (when ,vval
-                                  (setq ,vidx (serialize-enum ,vval '(,@(proto-values msg)) ,tag ,vbuf ,vidx)))))))
+                             (if (empty-default-p field)
+                               `(let ((,vval ,reader))
+                                  (when ,vval
+                                    (setq ,vidx (serialize-enum ,vval '(,@(proto-values msg)) ,tag ,vbuf ,vidx))))
+                               `(let ((,vval ,reader))
+                                  (when (and ,vval (not (eql ,vval ',(proto-default field))))
+                                    (setq ,vidx (serialize-enum ,vval '(,@(proto-values msg)) ,tag ,vbuf ,vidx))))))))
                          ((typep msg 'protobuf-type-alias)
                           (collect-serializer
                            (let* ((class (proto-proto-type msg))
                              `(let ((,vval ,reader))
                                 (when ,vval
                                   (let ((,vval (funcall #',(proto-serializer msg) ,vval)))
-                                    (setq ,vidx (serialize-prim ,vval ,class ,tag ,vbuf ,vidx))))))))))))))
+                                    (setq ,vidx (serialize-prim ,vval ,class ,tag ,vbuf ,vidx))))))))
+                         (t
+                          (undefined-field-type "While generating 'serialize-object' for ~S,"
+                                                message class field))))))))
       `(defmethod serialize-object
            (,vobj (,vclass (eql ,message)) ,vbuf &optional (,vidx 0) visited)
          (declare #.$optimize-serialization)
                                (multiple-value-bind (,vval idx)
                                    (deserialize-prim ,class ,vbuf ,vidx)
                                  (setq ,vidx idx)
-                                 (push (funcall #',(proto-deserializer msg) ,vval) ,temp))))))))
+                                 (push (funcall #',(proto-deserializer msg) ,vval) ,temp))))))
+                         (t
+                          (undefined-field-type "While generating 'deserialize-object' for ~S,"
+                                                message class field))))
                   (t
                    (cond ((keywordp class)
                           (collect-deserializer
                                      (deserialize-prim ,class ,vbuf ,vidx)
                                    (let ((,vval (funcall #',(proto-deserializer msg) ,vval)))
                                      (setq ,vidx idx)
-                                     ,(write-slot vobj field vval)))))))))))))
+                                     ,(write-slot vobj field vval)))))))
+                         (t
+                          (undefined-field-type "While generating 'deserialize-object' for ~S,"
+                                                message class field))))))))
       (let* ((rslots  (delete-duplicates rslots :key #'first))
              (rfields (mapcar #'first  rslots))
              (rtemps  (mapcar #'second rslots)))
                (index  (proto-index field)))
           (when reader
             (cond ((eq (proto-required field) :repeated)
-                   (let ((iterator (if (vector-field-p field) 'dovector 'dolist)))
+                   (let* ((vectorp  (vector-field-p field))
+                          (iterator (if vectorp 'dovector 'dolist)))
                      (cond ((and (proto-packed field) (packed-type-p class))
                             (collect-sizer
                              (let ((tag (make-tag class index)))
-                               `(iincf ,vsize (packed-size ,reader ,class ,tag)))))
+                               `(iincf ,vsize (packed-size ,reader ,class ,tag ,vectorp)))))
                            ((keywordp class)
                             (collect-sizer
                              (let ((tag (make-tag class index)))
                                (let ((tag1 (make-tag $wire-type-start-group index))
                                      (tag2 (make-tag $wire-type-end-group   index)))
                                  `(,iterator (,vval ,reader)
-                                    (let ((len (or (and visited (gethash ,vval visited))
+                                    (let ((len (or (cached-object-size ,vval visited)
                                                    (object-size ,vval ,msg visited))))
                                       (iincf ,vsize (length32 ,tag1))
                                       (iincf ,vsize len)
                                       (iincf ,vsize ,tag2))))
                                (let ((tag (make-tag $wire-type-string index)))
                                  `(,iterator (,vval ,reader)
-                                    (let ((len (or (and visited (gethash ,vval visited))
+                                    (let ((len (or (cached-object-size ,vval visited)
                                                    (object-size ,vval ,msg visited))))
                                       (iincf ,vsize (length32 ,tag))
                                       (iincf ,vsize (length32 len))
                                     (tag   (make-tag class index)))
                                `(,iterator (,vval ,reader)
                                   (let ((,vval (funcall #',(proto-serializer msg) ,vval)))
-                                    (iincf ,vsize (prim-size ,vval ,class ,tag))))))))))
+                                    (iincf ,vsize (prim-size ,vval ,class ,tag)))))))
+                           (t
+                            (undefined-field-type "While generating 'object-size' for ~S,"
+                                                  message class field)))))
                   (t
                    (cond ((keywordp class)
                           (let ((tag (make-tag class index)))
                                                      (t :unbound))))
                                     (unless (eq ,vval :unbound)
                                       (iincf ,vsize (prim-size ,vval ,class ,tag)))))
-                               `(let ((,vval ,reader))
-                                  (when ,vval
-                                    (iincf ,vsize (prim-size ,vval ,class ,tag))))))))
+                               (if (empty-default-p field)
+                                 `(let ((,vval ,reader))
+                                    (when ,vval
+                                      (iincf ,vsize (prim-size ,vval ,class ,tag))))
+                                 `(let ((,vval ,reader))
+                                    (when (and ,vval (not (equal ,vval ',(proto-default field))))
+                                      (iincf ,vsize (prim-size ,vval ,class ,tag)))))))))
                          ((typep msg 'protobuf-message)
                           (collect-sizer
                            (if (eq (proto-message-type msg) :group)
                                    (tag2 (make-tag $wire-type-end-group   index)))
                                `(let ((,vval ,reader))
                                   (when ,vval
-                                    (let ((len (or (and visited (gethash ,vval visited))
+                                    (let ((len (or (cached-object-size ,vval visited)
                                                    (object-size ,vval ,msg visited))))
                                       (iincf ,vsize (length32 ,tag1))
                                       (iincf ,vsize len)
                              (let ((tag (make-tag $wire-type-string index)))
                                `(let ((,vval ,reader))
                                   (when ,vval
-                                    (let ((len (or (and visited (gethash ,vval visited))
+                                    (let ((len (or (cached-object-size ,vval visited)
                                                    (object-size ,vval ,msg visited))))
                                       (iincf ,vsize (length32 ,tag))
                                       (iincf ,vsize (length32 len))
                          ((typep msg 'protobuf-enum)
                           (let ((tag (make-tag $wire-type-varint index)))
                             (collect-sizer
-                             `(let ((,vval ,reader))
-                                (when ,vval
-                                  (iincf ,vsize (enum-size ,vval '(,@(proto-values msg)) ,tag)))))))
+                             (if (empty-default-p field)
+                               `(let ((,vval ,reader))
+                                  (when ,vval
+                                    (iincf ,vsize (enum-size ,vval '(,@(proto-values msg)) ,tag))))
+                               `(let ((,vval ,reader))
+                                  (when (and ,vval (not (eql ,vval ',(proto-default field))))
+                                    (iincf ,vsize (enum-size ,vval '(,@(proto-values msg)) ,tag))))))))
                          ((typep msg 'protobuf-type-alias)
                           (collect-sizer
                            (let* ((class (proto-proto-type msg))
                                   (tag   (make-tag class index)))
                              `(let ((,vval ,reader))
                                 (when ,vval
-                                  (let ((,vval (funcall #',(proto-serializer msg) ,vval)))
-                                    (iincf ,vsize (prim-size ,vval ,class ,tag))))))))))))))
+                                  (iincf ,vsize (prim-size (funcall #',(proto-serializer msg) ,vval)
+                                                           ,class ,tag)))))))
+                         (t
+                          (undefined-field-type "While generating 'object-size' for ~S,"
+                                                message class field))))))))
       `(defmethod object-size
            (,vobj (,vclass (eql ,message)) &optional visited)
          (declare #.$optimize-serialization)
          (declare (ignorable visited))
-         (let ((,vsize (and visited (gethash ,vobj visited))))
-           (when ,vsize
-             (return-from object-size ,vsize)))
          (let ((,vsize 0))
            (declare (type fixnum ,vsize))
            ,@sizers
-           (when visited
-             (setf (gethash ,vobj visited) ,vsize))
+           (setf (cached-object-size ,vobj visited) ,vsize)
            ,vsize)))))