(in-package "SB!C")
;;; a value for an optimization declaration
-(def!type policy-quality () '(rational 0 3))
+(def!type policy-quality () '(integer 0 3))
;;; CMU CL used a special STRUCTURE-OBJECT type POLICY to represent
;;; the state of optimization policy at any point in compilation. This
;;; alists instead.
(def!type policy () 'list)
+(defstruct policy-dependent-quality
+ name
+ expression
+ getter
+ values-documentation)
+
;;; names of recognized optimization policy qualities
(defvar *policy-qualities*) ; (initialized at cold init)
+(defvar *policy-dependent-qualities* nil) ; alist of POLICY-DEPENDENT-QUALITYs
-;;; Is X the name of an optimization quality?
+;;; Is X the name of an optimization policy quality?
(defun policy-quality-name-p (x)
- (memq x *policy-qualities*))
+ (or (memq x *policy-qualities*)
+ (assq x *policy-dependent-qualities*)))
;;; *POLICY* holds the current global compiler policy information, as
;;; an alist mapping from optimization quality name to quality value.
inhibit-warnings))
(setf *policy*
(mapcar (lambda (name)
- ;; CMU CL didn't use 1 as the default for everything,
- ;; but since ANSI says 1 is the ordinary value, we do.
+ ;; CMU CL didn't use 1 as the default for
+ ;; everything, but since ANSI says 1 is the ordinary
+ ;; value, we do.
(cons name 1))
- *policy-qualities*)))
+ *policy-qualities*))
+ ;; not actually POLICY, but very similar
+ (setf *handled-conditions* nil))
+
;;; On the cross-compilation host, we initialize immediately (not
;;; waiting for "cold init", since cold init doesn't exist on
;;; cross-compilation host).
;;; Look up a named optimization quality in POLICY. This is only
;;; called by compiler code for known-valid QUALITY-NAMEs, e.g. SPEED;
;;; it's an error if it's called for a quality which isn't defined.
-;;;
-;;; FIXME: After this is debugged, it should get a DEFKNOWN.
-#+nil (declaim (ftype (function (policy symbol) policy-quality)))
(defun policy-quality (policy quality-name)
- (let ((acons (assoc quality-name policy)))
- (unless acons
- (error "Argh! no such optimization quality ~S in~% ~S"
- quality-name policy))
- (let ((result (cdr acons)))
- (unless (typep result '(rational 0 3))
- (error "Argh! bogus optimization quality ~S" acons))
- result)))
-
-;;; Return a list of symbols naming the optimization qualities which
-;;; appear in EXPR.
-(defun policy-qualities-used-by (expr)
- (let ((result nil))
- (labels ((recurse (x)
- (if (listp x)
- (map nil #'recurse x)
- (when (policy-quality-name-p x)
- (pushnew x result)))))
- (recurse expr)
- result)))
+ (aver (policy-quality-name-p quality-name))
+ (let* ((acons (assoc quality-name policy))
+ (result (or (cdr acons) 1)))
+ result))
;;; syntactic sugar for querying optimization policy qualities
;;;
-;;; Evaluate EXPR in terms of the current optimization policy for
-;;; NODE, or if NODE is NIL, in terms of the current policy as defined
-;;; by *POLICY*. (Using NODE=NIL is only well-defined during
-;;; IR1 conversion.)
-;;;
-;;; EXPR is a form which accesses the policy values by referring to
-;;; them by name, e.g. (> SPEED SPACE).
-(defmacro policy (node expr)
- (let* ((n-policy (gensym))
- (used-qualities (policy-qualities-used-by expr))
+;;; Evaluate EXPR in terms of the optimization policy associated with
+;;; THING. EXPR is a form which accesses optimization qualities by
+;;; referring to them by name, e.g. (> SPEED SPACE).
+(defmacro policy (thing expr)
+ (let* ((n-policy (gensym "N-POLICY-"))
(binds (mapcar (lambda (name)
`(,name (policy-quality ,n-policy ',name)))
- used-qualities)))
- `(let* ((,n-policy (lexenv-policy ,(if node
- `(node-lexenv ,node)
- '*lexenv*)))
- ,@binds)
+ *policy-qualities*))
+ (dependent-binds
+ (loop for (name . info) in *policy-dependent-qualities*
+ collect `(,name (policy-quality ,n-policy ',name))
+ collect `(,name (if (= ,name 1)
+ ,(policy-dependent-quality-expression info)
+ ,name)))))
+ `(let* ((,n-policy (%coerce-to-policy ,thing))
+ ,@binds
+ ,@dependent-binds)
+ (declare (ignorable ,@*policy-qualities*
+ ,@(mapcar #'car *policy-dependent-qualities*)))
,expr)))
+
+;;; Dependent qualities
+(defmacro define-optimization-quality
+ (name expression &optional documentation)
+ `(eval-when (:compile-toplevel :load-toplevel :execute)
+ (let ((acons (assoc ',name *policy-dependent-qualities*))
+ (item (make-policy-dependent-quality
+ :name ',name
+ :expression ',expression
+ :getter (lambda (policy) (policy policy ,expression))
+ :values-documentation ',documentation)))
+ (if acons
+ (setf (cdr acons) item)
+ (push `(,',name . ,item) *policy-dependent-qualities*)))
+ ',name))
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