X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fpolicy.lisp;h=cadc959b370566020b5e3cd485f248bd9e105c96;hb=4ba392170e98744f0ef0b8e08a5d42b988f1d0c9;hp=aa2bb6433097f24409f7676a3f2c3902f0e99c0e;hpb=cfb9e3640e34706acdfccd26236024de259f3b4f;p=sbcl.git diff --git a/src/compiler/policy.lisp b/src/compiler/policy.lisp index aa2bb64..cadc959 100644 --- a/src/compiler/policy.lisp +++ b/src/compiler/policy.lisp @@ -12,132 +12,181 @@ (in-package "SB!C") ;;; a value for an optimization declaration -(def!type policy-quality () '(rational 0 3)) +(def!type policy-quality () '(integer 0 3)) + +;;; global policy restrictions +(defvar *policy-restrictions* nil) + +(defun restrict-compiler-policy (&optional quality (min 0)) + #!+sb-doc + "Assign a minimum value to an optimization quality. QUALITY is the name of +the optimization quality to restrict, and MIN (defaulting to zero) is the +minimum allowed value. + +Returns the alist describing the current policy restrictions. + +If QUALITY is NIL or not given, nothing is done. + +Otherwise, if MIN is zero or not given, any existing restrictions of QUALITY +are removed. If MIN is between one and three inclusive, it becomes the new +minimum value for the optimization quality: any future proclamations or +declarations of the quality with a value less then MIN behave as if the value +was MIN instead. + +This is intended to be used interactively, to facilitate recompiling large +bodies of code with eg. a known minimum safety. + +See also :POLICY option in WITH-COMPILATION-UNIT. + +EXPERIMENTAL INTERFACE: Subject to change." + (declare (type policy-quality min)) + (when quality + (aver (policy-quality-name-p quality)) + (if (zerop min) + (setf *policy-restrictions* + (remove quality *policy-restrictions* :key #'car)) + (let ((cell (assoc quality *policy-restrictions*))) + (if cell + (setf (cdr cell) min) + (push (cons quality min) *policy-restrictions*))))) + *policy-restrictions*) ;;; CMU CL used a special STRUCTURE-OBJECT type POLICY to represent ;;; the state of optimization policy at any point in compilation. This -;;; became a little unwieldy, especially because of cold init issues -;;; for structures and structure accessors, so in SBCL we use an alist -;;; instead. +;;; was a natural choice, but in SBCL it became a little troublesome +;;; because of stupid technicalities involving the cold initialization +;;; of structure LAYOUTs and structure accessors, so now we just use +;;; alists instead. (def!type policy () 'list) -;;; names of recognized optimization qualities which don't have -;;; special defaulting behavior -(defvar *policy-basic-qualities*) ; (initialized at cold init) - -;;; FIXME: I'd like to get rid of DECLAIM OPTIMIZE-INTERFACE in favor -;;; of e.g. (DECLAIM (OPTIMIZE (INTERFACE-SPEED 2) (INTERFACE-SAFETY 3))). -#| -;;; a list of conses (DEFAULTING-QUALITY . DEFAULT-QUALITY) of qualities -;;; which default to other qualities when undefined, e.g. interface -;;; speed defaulting to basic speed -(defvar *policy-defaulting-qualities*) -|# - -(defun optimization-quality-p (name) - (or (member name *policy-basic-qualities*) - ;; FIXME: Uncomment this when OPTIMIZE-INTERFACE goes away. - #|(member name *policy-defaulting-qualities* :key #'car)|#)) - -;;; *DEFAULT-POLICY* holds the current global compiler policy -;;; information, as an alist mapping from optimization quality name to -;;; quality value. Inside the scope of declarations, new entries are -;;; added at the head of the alist. -;;; -;;; *DEFAULT-INTERFACE-POLICY* holds any values specified by an -;;; OPTIMIZE-INTERFACE declaration. -(declaim (type policy *default-policy* *default-interface-policy*)) -(defvar *default-policy*) ; initialized in cold init -(defvar *default-interface-policy*) ; initialized in cold init +(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 policy quality? +(defun policy-quality-name-p (x) + (or (memq x *policy-qualities*) + (assq x *policy-dependent-qualities*))) + +;;; Is it deprecated? +(defun policy-quality-deprecation-warning (quality) + (case quality + ((stack-allocate-dynamic-extent stack-allocate-vector stack-allocate-value-cells) + (deprecation-warning :late "1.0.19.7" quality '*stack-allocate-dynamic-extent* + :runtime-error nil) + t) + ((merge-tail-calls) + (deprecation-warning :early "1.0.53.74" quality nil :runtime-error nil) + t) + (otherwise + nil))) + +;;; *POLICY* holds the current global compiler policy information, as +;;; an alist mapping from optimization quality name to quality value. +;;; Inside the scope of declarations, new entries are added at the +;;; head of the alist. +(declaim (type policy *policy*)) +(defvar *policy*) ; initialized in cold init + +(defun sort-policy (policy) + ;; We occasionally want to compare policies using EQL, hence we + ;; canonize the order. + (sort policy #'string< :key #'car)) ;;; This is to be called early in cold init to set things up, and may ;;; also be called again later in cold init in order to reset default ;;; optimization policy back to default values after toplevel PROCLAIM ;;; OPTIMIZE forms have messed with it. (defun !policy-cold-init-or-resanify () - (setf *policy-basic-qualities* - '(;; ANSI standard qualities - compilation-speed - debug - safety - space - speed - ;; SBCL extensions - ;; - ;; FIXME: INHIBIT-WARNINGS is a misleading name for this. - ;; Perhaps BREVITY would be better. But the ideal name would - ;; have connotations of suppressing not warnings but only - ;; optimization-related notes, which is already mostly the - ;; behavior, and should probably become the exact behavior. - ;; Perhaps INHIBIT-NOTES? - inhibit-warnings)) - #| - (setf *policy-defaulting-qualities* - '((interface-speed . speed) - (interface-safety . safety))) - |# - (setf *default-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. - (cons name 1)) - *policy-basic-qualities*)) - (setf *default-interface-policy* - *default-policy*)) + (setf *policy-qualities* + '(;; ANSI standard qualities + compilation-speed + debug + safety + space + speed + ;; SBCL extensions + ;; + ;; FIXME: INHIBIT-WARNINGS is a misleading name for this. + ;; Perhaps BREVITY would be better. But the ideal name would + ;; have connotations of suppressing not warnings but only + ;; optimization-related notes, which is already mostly the + ;; behavior, and should probably become the exact behavior. + ;; Perhaps INHIBIT-NOTES? + inhibit-warnings)) + (setf *policy* + (sort-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. + (cons name 1)) + *policy-qualities*))) + (setf *policy-restrictions* nil) + ;; not actually POLICY, but very similar + (setf *handled-conditions* nil + *disabled-package-locks* nil)) + ;;; On the cross-compilation host, we initialize immediately (not ;;; waiting for "cold init", since cold init doesn't exist on ;;; cross-compilation host). #+sb-xc-host (!policy-cold-init-or-resanify) -;;; Is X the name of an optimization quality? -(defun policy-quality-name-p (x) - (memq x *policy-basic-qualities*)) - ;;; 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)) + (%policy-quality policy quality-name)) + +(defun %policy-quality (policy quality-name) + (let* ((acons (assoc quality-name policy)) + (min (or (cdr (assoc quality-name *policy-restrictions*)) 0)) + (result (or (cdr acons) 1))) + (max result min))) ;;; 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 *DEFAULT-POLICY* and *CURRENT-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)) - (binds (mapcar (lambda (name) - `(,name (policy-quality ,n-policy ',name))) - used-qualities))) - `(let* ((,n-policy (lexenv-policy ,(if node - `(node-lexenv ,node) - '*lexenv*))) - ,@binds) - ,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))) + *policy-qualities*)) + (dependent-binds + (loop for (name . info) in *policy-dependent-qualities* + collect `(,name (let ((,name (policy-quality ,n-policy ',name))) + (if (= ,name 1) + ,(policy-dependent-quality-expression info) + ,name)))))) + `(let* ((,n-policy (%coerce-to-policy ,thing))) + (declare (ignorable ,n-policy)) + (symbol-macrolet (,@binds + ,@dependent-binds) + ,expr)))) + +;;; Dependent qualities +(defmacro define-optimization-quality + (name expression &optional values-documentation documentation) + (declare (ignorable 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 ',values-documentation))) + (if acons + (setf (cdr acons) item) + (setf *policy-dependent-qualities* + (nconc *policy-dependent-qualities* (list `(,',name . ,item)))))) + #-sb-xc-host + ,@(when documentation `((setf (fdocumentation ',name 'optimize) ,documentation))) + ',name))