-;;; code generators for cases of DEFUN SLOT-ACCESSOR-FUNS
-;;;
-;;; (caution: These macros are sleazily specialized for use only in
-;;; DEFUN SLOT-ACCESSOR-FUNS, not anywhere near fully parameterized:
-;;; they grab symbols like INSTANCE and DSD-FOO automatically.
-;;; Logically they probably belong in a MACROLET inside the DEFUN, but
-;;; separating them like this makes it easier to experiment with them
-;;; in the interpreter and reduces indentation hell.)
-;;;
-;;; FIXME: Ideally, the presence of the type checks in the functions
-;;; here would be conditional on the optimization policy at the point
-;;; of expansion of DEFSTRUCT. (For now we're just doing the simpler
-;;; thing, putting in the type checks unconditionally.)
-(eval-when (:compile-toplevel)
-
- ;; code shared between funcallable instance case and the ordinary
- ;; STRUCTURE-OBJECT case: Handle native structures with LAYOUTs and
- ;; (possibly) raw slots.
- (defmacro %native-slot-accessor-funs (dd-ref-fun-name)
- (let ((instance-type-check-form '(%check-structure-type-from-layout
- instance layout)))
- `(let ((layout (dd-layout-or-lose dd))
- (dsd-raw-type (dsd-raw-type dsd)))
- ;; Map over all the possible RAW-TYPEs, compiling a different
- ;; closure-function for each one, so that once the COND over
- ;; RAW-TYPEs happens (at the time closure is allocated) there
- ;; are no more decisions to be made and things execute
- ;; reasonably efficiently.
- (cond
- ;; nonraw slot case
- ((eql (dsd-raw-type dsd) t)
- (%slotplace-accessor-funs (,dd-ref-fun-name instance dsd-index)
- ,instance-type-check-form))
- ;; raw slot cases
- ,@(mapcar (lambda (raw-type-and-rawref-fun-name)
- (destructuring-bind (raw-type . rawref-fun-name)
- raw-type-and-rawref-fun-name
- `((equal dsd-raw-type ',raw-type)
- (let ((raw-index (dd-raw-index dd)))
- (%slotplace-accessor-funs
- (,rawref-fun-name (,dd-ref-fun-name instance
- raw-index)
- dsd-index)
- ,instance-type-check-form)))))
- *raw-type->rawref-fun-name*)))))
-
- ;; code shared between DEFSTRUCT :TYPE LIST and
- ;; DEFSTRUCT :TYPE VECTOR cases: Handle the "typed structure" case,
- ;; with no LAYOUTs and no raw slots.
- (defmacro %colontyped-slot-accessor-funs () (error "stub"))
-
- ;; the common structure of the raw-slot and not-raw-slot cases,
- ;; defined in terms of the writable SLOTPLACE. All possible flavors
- ;; of slot access should be able to pass through here.
- (defmacro %slotplace-accessor-funs (slotplace instance-type-check-form)
- (cl-user:/show slotplace instance-type-check-form)
- `(values (lambda (instance)
- ,instance-type-check-form
- ,slotplace)
- (let ((typecheckfun (typespec-typecheckfun dsd-type)))
- (lambda (new-value instance)
- ,instance-type-check-form
- (funcall typecheckfun new-value)
- (setf ,slotplace new-value))))))
-
-;;; Return (VALUES SLOT-READER-FUN SLOT-WRITER-FUN).
-(defun slot-accessor-funs (dd dsd)
-
- (let ((dsd-index (dsd-index dsd))
- (dsd-type (dsd-type dsd)))
-
- (ecase (dd-type dd)
-
- ;; native structures
- (structure (%native-slot-accessor-funs %instance-ref))
- (funcallable-structure (%native-slot-accessor-funs
- %funcallable-instance-info))
-
- ;; structures with the :TYPE option
-
- ;; FIXME: Worry about these later..
- #|
- ;; In :TYPE LIST and :TYPE VECTOR structures, ANSI specifies the
- ;; layout completely, so that raw slots are impossible.
- (list
- (dd-type-slot-accessor-funs nth-but-with-sane-arg-order
- `(%check-structure-type-from-dd
- :maybe-raw-p nil))
- (vector
- (dd-type-slot-accessor-funs aref
- :maybe-raw-p nil)))
- |#
- )))
-\f
-;;;; REMOVEME: baby steps for the new out-of-line slot accessor functions
-
-#|
-(in-package :sb-kernel)
-
-(defstruct foo
- ;; vanilla slots
- a
- (b 5 :type package :read-only t)
- ;; raw slots
- (x 5 :type (unsigned-byte 32))
- (y 5.0 :type single-float :read-only t))
-
-(load "/usr/stuff/sbcl/src/cold/chill")
-(cl-user:fasl "/usr/stuff/sbcl/src/code/typecheckfuns")
-(cl-user:fasl "/usr/stuff/outsacc")
-
-(let* ((foo-layout (compiler-layout-or-lose 'foo))
- (foo-dd (layout-info foo-layout))
- (foo-dsds (dd-slots foo-dd))
- (foo-a-dsd (find "A" foo-dsds :test #'string= :key #'dsd-%name))
- (foo-b-dsd (find "B" foo-dsds :test #'string= :key #'dsd-%name))
- (foo-x-dsd (find "X" foo-dsds :test #'string= :key #'dsd-%name))
- (foo-y-dsd (find "X" foo-dsds :test #'string= :key #'dsd-%name))
- (foo (make-foo :a 'avalue
- :b (find-package :cl)
- :x 50)))
- (declare (type layout foo-layout))
- (declare (type defstruct-description foo-dd))
- (declare (type defstruct-slot-description foo-a-dsd))
-
- (cl-user:/show foo)
-
- (multiple-value-bind (foo-a-reader foo-a-writer)
- (slot-accessor-funs foo-dd foo-a-dsd)
-
- ;; basic functionality
- (cl-user:/show foo-a-reader)
- (cl-user:/show (funcall foo-a-reader foo))
- (aver (eql (funcall foo-a-reader foo) 'avalue))
- (cl-user:/show foo-a-writer)
- (cl-user:/show (funcall foo-a-writer 'replacedavalue foo))
- (cl-user:/show "new" (funcall foo-a-reader foo))
- (aver (eql (funcall foo-a-reader foo) 'replacedavalue))
-
- ;; type checks on FOO-ness of instance argument
- (cl-user:/show (nth-value 1 (ignore-errors (funcall foo-a-reader 3))))
- (aver (typep (nth-value 1 (ignore-errors (funcall foo-a-reader 3)))
- 'type-error))
- (aver (typep (nth-value 1 (ignore-errors (funcall foo-a-writer 3 4)))
- 'type-error)))
-
- ;; type checks on written slot value
- (multiple-value-bind (foo-b-reader foo-b-writer)
- (slot-accessor-funs foo-dd foo-b-dsd)
- (cl-user:/show "old" (funcall foo-b-reader foo))
- (aver (not (eql (funcall foo-b-reader foo) (find-package :cl-user))))
- (funcall foo-b-writer (find-package :cl-user) foo)
- (cl-user:/show "new" (funcall foo-b-reader foo))
- (aver (eql (funcall foo-b-reader foo) (find-package :cl-user)))
- (aver (typep (nth-value 1 (ignore-errors (funcall foo-b-writer 5 foo)))
- 'type-error))
- (aver (eql (funcall foo-b-reader foo) (find-package :cl-user))))
-
- ;; raw slots
- (cl-user:/describe foo-x-dsd)
- (cl-user:/describe foo-y-dsd)
- (multiple-value-bind (foo-x-reader foo-x-writer)
- (slot-accessor-funs foo-dd foo-x-dsd)
- (multiple-value-bind (foo-y-reader foo-y-writer)
- (slot-accessor-funs foo-dd foo-y-dsd)
-
- ;; basic functionality for (UNSIGNED-BYTE 32) slot
- (cl-user:/show foo-x-reader)
- (cl-user:/show (funcall foo-x-reader foo))
- (aver (eql (funcall foo-x-reader foo) 50))
- (cl-user:/show foo-x-writer)
- (cl-user:/show (funcall foo-x-writer 14 foo))
- (cl-user:/show "new" (funcall foo-x-reader foo))
- (aver (eql (funcall foo-x-reader foo) 14)))
-
- ;; type check for (UNSIGNED-BYTE 32) slot
- (/show "to do: type check X")
-
- ;; SINGLE-FLOAT slot
- (/show "to do: Y")))
-|#
+ ;; information about how a slot of a given DSD-RAW-TYPE is to be accessed
+ (defstruct raw-slot-data
+ ;; the raw slot type, or T for a non-raw slot
+ ;;
+ ;; (Raw slots are allocated in the raw slots array in a vector which
+ ;; the GC doesn't need to scavenge. Non-raw slots are in the
+ ;; ordinary place you'd expect, directly indexed off the instance
+ ;; pointer.)
+ (raw-type (missing-arg) :type (or symbol cons) :read-only t)
+ ;; What operator is used (on the raw data vector) to access a slot
+ ;; of this type?
+ (accessor-name (missing-arg) :type symbol :read-only t)
+ ;; How many words are each value of this type? (This is used to
+ ;; rescale the offset into the raw data vector.)
+ (n-words (missing-arg) :type (and index (integer 1)) :read-only t))
+
+ (defvar *raw-slot-data-list*
+ (list
+ ;; The compiler thinks that the raw data vector is a vector of
+ ;; word-sized unsigned bytes, so if the slot we want to access
+ ;; actually *is* an unsigned byte, it'll access the slot for us
+ ;; even if we don't lie to it at all, just let it use normal AREF.
+ (make-raw-slot-data :raw-type 'unsigned-byte
+ :accessor-name 'aref
+ :n-words 1)
+ ;; In the other cases, we lie to the compiler, making it use
+ ;; some low-level AREFish access in order to pun the hapless
+ ;; bits into some other-than-unsigned-byte meaning.
+ ;;
+ ;; "A lie can travel halfway round the world while the truth is
+ ;; putting on its shoes." -- Mark Twain
+ (make-raw-slot-data :raw-type 'single-float
+ :accessor-name '%raw-ref-single
+ :n-words 1)
+ (make-raw-slot-data :raw-type 'double-float
+ :accessor-name '%raw-ref-double
+ :n-words 2)
+ (make-raw-slot-data :raw-type 'complex-single-float
+ :accessor-name '%raw-ref-complex-single
+ :n-words 2)
+ (make-raw-slot-data :raw-type 'complex-double-float
+ :accessor-name '%raw-ref-complex-double
+ :n-words 4)
+ #!+long-float
+ (make-raw-slot-data :raw-type long-float
+ :accessor-name '%raw-ref-long
+ :n-words #!+x86 3 #!+sparc 4)
+ #!+long-float
+ (make-raw-slot-data :raw-type complex-long-float
+ :accessor-name '%raw-ref-complex-long
+ :n-words #!+x86 6 #!+sparc 8))))