X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Flate-extensions.lisp;h=3c992d0759769597e43d883eb6ede6e3585841e8;hb=7c75cd363da90afe334e936aad2b63437ea5905d;hp=f6c5f25aed6233787d28f4714510ee50e7cbf27b;hpb=bfb19d306581ac86feb4371846c4b9953d692dd8;p=sbcl.git diff --git a/src/code/late-extensions.lisp b/src/code/late-extensions.lisp index f6c5f25..3c992d0 100644 --- a/src/code/late-extensions.lisp +++ b/src/code/late-extensions.lisp @@ -48,12 +48,15 @@ ;;; Used internally, but it would be nice to provide something ;;; like this for users as well. - +;;; +;;; FIXME / IMPORTANT: If the slot is raw, the address is correct only for +;;; instances of the specified class, not its subclasses! #!+sb-thread (defmacro define-structure-slot-addressor (name &key structure slot) (let* ((dd (find-defstruct-description structure t)) (slotd (when dd (find slot (dd-slots dd) :key #'dsd-name))) - (index (when slotd (dsd-index slotd)))) + (index (when slotd (dsd-index slotd))) + (raw-type (dsd-raw-type slotd))) (unless index (error "Slot ~S not found in ~S." slot structure)) `(progn @@ -63,13 +66,17 @@ (sb!ext:truly-the sb!vm:word (+ (sb!kernel:get-lisp-obj-address instance) - (- (* ,(+ sb!vm:instance-slots-offset index) sb!vm:n-word-bytes) + (- (* ,(if (eq t raw-type) + (+ sb!vm:instance-slots-offset index) + (- (1+ (sb!kernel::dd-instance-length dd)) sb!vm:instance-slots-offset index + (1- (sb!kernel::raw-slot-words raw-type)))) + sb!vm:n-word-bytes) sb!vm:instance-pointer-lowtag))))))) -(defmacro compare-and-swap (place old new) +(defmacro compare-and-swap (place old new &environment env) "Atomically stores NEW in PLACE if OLD matches the current value of PLACE. Two values are considered to match if they are EQ. Returns the previous value -of PLACE: if the returned value if EQ to OLD, the swap was carried out. +of PLACE: if the returned value is EQ to OLD, the swap was carried out. PLACE must be an accessor form whose CAR is one of the following: @@ -92,9 +99,26 @@ EXPERIMENTAL: Interface subject to change." ((cdr rest) `(%compare-and-swap-cdr (the cons ,@args) ,old ,new)) (symbol-plist - `(%compare-and-swap-symbol-plist (the symbol ,@args) ,old ,new)) + `(%compare-and-swap-symbol-plist (the symbol ,@args) ,old (the list ,new))) (symbol-value - `(%compare-and-swap-symbol-value (the symbol ,@args) ,old ,new)) + (destructuring-bind (name) args + (flet ((slow (symbol) + (with-unique-names (n-symbol n-old n-new) + `(let ((,n-symbol ,symbol) + (,n-old ,old) + (,n-new ,new)) + (declare (symbol ,n-symbol)) + (about-to-modify-symbol-value ,n-symbol 'compare-and-swap ,n-new) + (%compare-and-swap-symbol-value ,n-symbol ,n-old ,n-new))))) + (if (sb!xc:constantp name env) + (let ((cname (constant-form-value name env))) + (if (eq :special (info :variable :kind cname)) + ;; Since we know the symbol is a special, we can just generate + ;; the type check. + `(%compare-and-swap-symbol-value + ',cname ,old (the ,(info :variable :type cname) ,new)) + (slow (list 'quote cname)))) + (slow name))))) (svref (let ((vector (car args)) (index (cadr args))) @@ -124,6 +148,8 @@ EXPERIMENTAL: Interface subject to change." (error "Invalid first argument to COMPARE-AND-SWAP: ~S" place)))))))) (macrolet ((def (name lambda-list ref &optional set) + #!+compare-and-swap-vops + (declare (ignore ref set)) `(defun ,name (,@lambda-list old new) #!+compare-and-swap-vops (,name ,@lambda-list old new) @@ -140,3 +166,138 @@ EXPERIMENTAL: Interface subject to change." (def %compare-and-swap-symbol-plist (symbol) symbol-plist) (def %compare-and-swap-symbol-value (symbol) symbol-value) (def %compare-and-swap-svref (vector index) svref)) + +(defun expand-atomic-frob (name place diff) + (flet ((invalid-place () + (error "Invalid first argument to ~S: ~S" name place))) + (unless (consp place) + (invalid-place)) + (destructuring-bind (op &rest args) place + (when (cdr args) + (invalid-place)) + (let ((dd (info :function :structure-accessor op))) + (if dd + (let* ((structure (dd-name dd)) + (slotd (find op (dd-slots dd) :key #'dsd-accessor-name)) + (index (dsd-index slotd)) + (type (dsd-type slotd))) + (declare (ignorable structure index)) + (unless (and (eq 'sb!vm:word (dsd-raw-type slotd)) + (type= (specifier-type type) (specifier-type 'sb!vm:word))) + (error "~S requires a slot of type (UNSIGNED-BYTE ~S), not ~S: ~S" + name sb!vm:n-word-bits type place)) + (when (dsd-read-only slotd) + (error "Cannot use ~S with structure accessor for a read-only slot: ~S" + name place)) + #!+(or x86 x86-64) + `(truly-the sb!vm:word + (%raw-instance-atomic-incf/word + (the ,structure ,@args) ,index + (logand #.(1- (ash 1 sb!vm:n-word-bits)) + ,(ecase name + (atomic-incf + `(the sb!vm:signed-word ,diff)) + (atomic-decf + `(- (the sb!vm:signed-word ,diff))))))) + ;; No threads outside x86 and x86-64 for now, so this is easy... + #!-(or x86 x86-64) + (with-unique-names (structure old) + `(sb!sys:without-interrupts + (let* ((,structure ,@args) + (,old (,op ,structure))) + (setf (,op ,structure) + (logand #.(1- (ash 1 sb!vm:n-word-bits)) + ,(ecase name + (atomic-incf + `(+ ,old (the sb!vm:signed-word ,diff))) + (atomic-decf + `(- ,old (the sb!vm:signed-word ,diff)))))) + ,old)))) + (invalid-place)))))) + +(defmacro atomic-incf (place &optional (diff 1)) + #!+sb-doc + "Atomically increments PLACE by DIFF, and returns the value of PLACE before +the increment. + +The incrementation is done using word-size modular arithmetic: on 32 bit +platforms ATOMIC-INCF of #xFFFFFFFF by one results in #x0 being stored in +PLACE. + +PLACE must be an accessor form whose CAR is the name of a DEFSTRUCT accessor +whose declared type is (UNSIGNED-BYTE 32) on 32 bit platforms, +and (UNSIGNED-BYTE 64) on 64 bit platforms. + +DIFF defaults to 1, and must be a (SIGNED-BYTE 32) on 32 bit platforms, +and (SIGNED-BYTE 64) on 64 bit platforms. + +EXPERIMENTAL: Interface subject to change." + (expand-atomic-frob 'atomic-incf place diff)) + +(defmacro atomic-decf (place &optional (diff 1)) + #!+sb-doc + "Atomically decrements PLACE by DIFF, and returns the value of PLACE before +the increment. + +The decrementation is done using word-size modular arithmetic: on 32 bit +platforms ATOMIC-DECF of #x0 by one results in #xFFFFFFFF being stored in +PLACE. + +PLACE must be an accessor form whose CAR is the name of a DEFSTRUCT accessor +whose declared type is (UNSIGNED-BYTE 32) on 32 bit platforms, +and (UNSIGNED-BYTE 64) on 64 bit platforms. + +DIFF defaults to 1, and must be a (SIGNED-BYTE 32) on 32 bit platforms, +and (SIGNED-BYTE 64) on 64 bit platforms. + +EXPERIMENTAL: Interface subject to change." + (expand-atomic-frob 'atomic-decf place diff)) + +(defun call-hooks (kind hooks &key (on-error :error)) + (dolist (hook hooks) + (handler-case + (funcall hook) + (serious-condition (c) + (if (eq :warn on-error) + (warn "Problem running ~A hook ~S:~% ~A" kind hook c) + (with-simple-restart (continue "Skip this ~A hook." kind) + (error "Problem running ~A hook ~S:~% ~A" kind hook c))))))) + +;;;; DEFGLOBAL + +(defmacro-mundanely defglobal (name value &optional (doc nil docp)) + #!+sb-doc + "Defines NAME as a global variable that is always bound. VALUE is evaluated +and assigned to NAME both at compile- and load-time, but only if NAME is not +already bound. + +Global variables share their values between all threads, and cannot be +locally bound, declared special, defined as constants, and neither bound +nor defined as symbol macros. + +See also the declarations SB-EXT:GLOBAL and SB-EXT:ALWAYS-BOUND." + `(progn + (eval-when (:compile-toplevel) + (let ((boundp (boundp ',name))) + (%compiler-defglobal ',name (unless boundp ,value) boundp))) + (eval-when (:load-toplevel :execute) + (let ((boundp (boundp ',name))) + (%defglobal ',name (unless boundp ,value) boundp ',doc ,docp + (sb!c:source-location)))))) + +(defun %compiler-defglobal (name value boundp) + (sb!xc:proclaim `(global ,name)) + (unless boundp + #-sb-xc-host + (set-symbol-global-value name value) + #+sb-xc-host + (set name value)) + (sb!xc:proclaim `(always-bound ,name))) + +(defun %defglobal (name value boundp doc docp source-location) + (%compiler-defglobal name value boundp) + (when docp + (setf (fdocumentation name 'variable) doc)) + (sb!c:with-source-location (source-location) + (setf (info :source-location :variable name) source-location)) + name)