0.pre7.127:

[sbcl.git] / src / compiler / generic / objdef.lisp

diff --git a/src/compiler/generic/objdef.lisp b/src/compiler/generic/objdef.lisp
index 17b27e3..786c9d4 100644 (file)
--- a/src/compiler/generic/objdef.lisp
+++ b/src/compiler/generic/objdef.lisp
@@ -10,6 +10,31 @@
 ;;;; files for more information.
 
 (in-package "SB!VM")
+
+;;;; KLUDGE: The primitive objects here may look like self-contained
+;;;; definitions, but in general they're not. In particular, if you
+;;;; try to add a slot to them, beware of the following:
+;;;;   * (mysterious crashes which occur after changing the length
+;;;;     of SIMPLE-FUN, just adding a new slot not even doing anything
+;;;;     with it, still dunno why)
+;;;;   * The GC scavenging code (and for all I know other GC code too)
+;;;;     is not automatically generated from these layouts, but instead
+;;;;     was hand-written to correspond to them. The offsets are
+;;;;     automatically propagated into the GC scavenging code, but the
+;;;;     existence of slots, and whether they should be scavenged, is
+;;;;     not automatically propagated. Thus e.g. if you add a
+;;;;     SIMPLE-FUN-DEBUG-INFO slot holding a tagged object which needs
+;;;;     to be GCed, you need to tweak scav_code_header() and
+;;;;     verify_space() in gencgc.c, and the corresponding code in gc.c.
+;;;;   * The src/runtime/print.c code (used by LDB) is implemented
+;;;;     using hand-written lists of slot names, which aren't automatically
+;;;;     generated from the code in this file.
+;;;;   * Various code (e.g. STATIC-FSET in genesis.lisp) is hard-wired
+;;;;     to know the name of the last slot of the object the code works
+;;;;     with, and implicitly to know that the last slot is special (being
+;;;;     the beginning of an arbitrary-length sequence of bytes following
+;;;;     the fixed-layout slots).
+;;;; -- WHN 2001-12-29
 \f
 ;;;; the primitive objects themselves
 
@@ -176,6 +201,12 @@
        :ref-trans %simple-fun-type
        :set-known (unsafe)
        :set-trans (setf %simple-fun-type))
+  ;; the SB!C::DEBUG-FUN object corresponding to this object, or NIL for none
+  #+nil ; FIXME: doesn't work (gotcha, lowly maintenoid!) See notes on bug 137.
+  (debug-fun :ref-known (flushable)
+             :ref-trans %simple-fun-debug-fun
+             :set-known (unsafe)
+             :set-trans (setf %simple-fun-debug-fun))
   (code :rest-p t :c-type "unsigned char"))
 
 (define-primitive-object (return-pc :lowtag other-pointer-lowtag :widetag t)
@@ -273,7 +304,7 @@
 
 ;;; (For an explanation of this, see the comments at the definition of
 ;;; KLUDGE-NONDETERMINISTIC-CATCH-BLOCK-SIZE.)
-(aver (= sb!vm::kludge-nondeterministic-catch-block-size catch-block-size))
+(aver (= kludge-nondeterministic-catch-block-size catch-block-size))
 \f
 ;;;; symbols