src/utilities: (add partial-order-minima)

[sod] / src / method-proto.lisp

diff --git a/src/method-proto.lisp b/src/method-proto.lisp
index f5d8be7a228f737136ee21c809eba410d08eb0d3..e85f62ad78e25daf26bb8619f686cfa7bf11010f 100644 (file)
--- a/src/method-proto.lisp
+++ b/src/method-proto.lisp
@@ -63,6 +63,15 @@ (defgeneric primary-method-class (message)
 
    This protocol is used by `simple-message' subclasses."))
 
+(export 'method-keyword-argument-lists)
+(defgeneric method-keyword-argument-lists (method direct-methods)
+  (:documentation
+   "Returns a list of keyword argument lists to be merged.
+
+   This should return a list suitable for passing to `merge-keyword-lists',
+   i.e., each element should be a pair consisting of a list of `argument'
+   objects and a string describing the source of the argument list."))
+
 (export 'compute-sod-effective-method)
 (defgeneric compute-sod-effective-method (message class)
   (:documentation
@@ -216,6 +225,16 @@ (defgeneric effective-method-basic-argument-names (method)
    not included, and neither are more exotic arguments added as part of the
    method delegation protocol."))
 
+(export 'effective-method-live-p)
+(defgeneric effective-method-live-p (method)
+  (:documentation
+   "Returns true if the effective METHOD is live.
+
+   An effective method is `live' if it should actually have proper method entry
+   functions associated with it and stored in the class vtable.  The other
+   possibility is that the method is `dead', in which case the function
+   pointers in the vtable are left null."))
+
 ;;;--------------------------------------------------------------------------
 ;;; Code generation.
 
@@ -271,14 +290,10 @@ (definst convert-to-ilayout (stream :export t)
 
 ;;; Utilities.
 
-(defvar *keyword-struct-disposition* :unset
+(defvar-unbound *keyword-struct-disposition*
   "The current state of the keyword structure.
 
-   This can be one of four values.
-
-     * `:unset' -- the top-level default, mostly because I can't leave it
-       unbound and write this documentation.  Nothing that matters should see
-       this state.
+   This can be one of three values.
 
      * `:local' -- the structure itself is in a local variable `sod__kw'.
        This is used in the top-level effective method.
@@ -409,14 +424,17 @@ (defun make-trampoline (codegen super body)
                           (cons (make-argument *sod-key-pointer*
                                                (c-type (* (void :const))))
                                 raw-args))))
-        (*keyword-struct-disposition* t))
+        (*keyword-struct-disposition* (if (effective-method-keywords method)
+                                          :pointer :null)))
     (codegen-push codegen)
     (ensure-ilayout-var codegen super)
-    (when (and (keyword-message-p message)
-              (not (eq *keyword-struct-disposition* :null)))
-      (let ((tag (effective-method-keyword-struct-tag method)))
-       (ensure-var codegen *sod-keywords* (c-type (* (struct tag :const)))
-                   *sod-key-pointer*)))
+    (when (keyword-message-p message)
+      (if (eq *keyword-struct-disposition* :null)
+         (deliver-call codegen :void "SOD__IGNORE" *sod-key-pointer*)
+         (let ((tag (effective-method-keyword-struct-tag method)))
+           (ensure-var codegen *sod-keywords*
+                       (c-type (* (struct tag :const)))
+                       *sod-key-pointer*))))
     (funcall body (codegen-target codegen))
     (codegen-pop-function codegen (temporary-function)
                          (c-type (fun (lisp return-type)
@@ -480,11 +498,9 @@ (defun invoke-delegation-chain (codegen target basic-tail chain kernel)
    nil."
 
   (let* ((message (codegen-message codegen))
-        (argument-tail (cond ((varargs-message-p message)
-                              (cons *sod-tmp-ap* basic-tail))
-                             ((keyword-message-p message)
-                              (cons (keyword-struct-pointer) basic-tail))
-                             (t basic-tail))))
+        (argument-tail (if (varargs-message-p message)
+                           (cons *sod-tmp-ap* basic-tail)
+                           basic-tail)))
     (labels ((next-trampoline (method chain)
               (if (or kernel chain)
                   (make-trampoline codegen (sod-method-class method)
@@ -495,9 +511,13 @@ (defun invoke-delegation-chain (codegen target basic-tail chain kernel)
               (if (null chain)
                   (funcall kernel target)
                   (let ((trampoline (next-trampoline (car chain)
-                                                     (cdr chain))))
+                                                     (cdr chain)))
+                        (tail (if (keyword-message-p message)
+                                  (cons (keyword-struct-pointer)
+                                        argument-tail)
+                                  argument-tail)))
                     (invoke-method codegen target
-                                   (cons trampoline argument-tail)
+                                   (cons trampoline tail)
                                    (car chain))))))
       (invoke chain target))))