X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fearly-type.lisp;h=2eea09772a3a53b5bd43300c2e7238d96acebbd0;hb=67d2b80e478824a46317419f076ab1f6b020f6b1;hp=2c19b758cb92d007c618528e1abd6663e29f4d42;hpb=6c765578c8dc4bcc7798e37c9918715f198b30da;p=sbcl.git diff --git a/src/code/early-type.lisp b/src/code/early-type.lisp index 2c19b75..2eea097 100644 --- a/src/code/early-type.lisp +++ b/src/code/early-type.lisp @@ -15,80 +15,7 @@ ;;; use it?) (defvar *type-system-initialized* #+sb-xc-host nil) ; (set in cold load) -;;; Return the type structure corresponding to a type specifier. We -;;; pick off structure types as a special case. -;;; -;;; Note: VALUES-SPECIFIER-TYPE-CACHE-CLEAR must be called whenever a -;;; type is defined (or redefined). -(defun-cached (values-specifier-type - :hash-function (lambda (x) - ;; FIXME: The THE FIXNUM stuff is - ;; redundant in SBCL (or modern CMU - ;; CL) because of type inference. - (the fixnum - (logand (the fixnum (sxhash x)) - #x3FF))) - :hash-bits 10 - :init-wrapper !cold-init-forms) - ((orig eq)) - (let ((u (uncross orig))) - (or (info :type :builtin u) - (let ((spec (type-expand u))) - (cond - ((and (not (eq spec u)) - (info :type :builtin spec))) - ((eq (info :type :kind spec) :instance) - (sb!xc:find-class spec)) - ((typep spec 'class) - ;; There doesn't seem to be any way to translate - ;; (TYPEP SPEC 'BUILT-IN-CLASS) into something which can be - ;; executed on the host Common Lisp at cross-compilation time. - #+sb-xc-host (error - "stub: (TYPEP SPEC 'BUILT-IN-CLASS) on xc host") - (if (typep spec 'built-in-class) - (or (built-in-class-translation spec) spec) - spec)) - (t - (let* (;; FIXME: This automatic promotion of FOO-style - ;; specs to (FOO)-style specs violates the ANSI - ;; standard. Unfortunately, we can't fix the - ;; problem just by removing it, since then things - ;; downstream should break. But at some point we - ;; should fix this and the things downstream too. - (lspec (if (atom spec) (list spec) spec)) - (fun (info :type :translator (car lspec)))) - (cond (fun - (funcall fun lspec)) - ((or (and (consp spec) (symbolp (car spec))) - (symbolp spec)) - (when *type-system-initialized* - (signal 'parse-unknown-type :specifier spec)) - ;; (The RETURN-FROM here inhibits caching.) - (return-from values-specifier-type - (make-unknown-type :specifier spec))) - (t - (error "bad thing to be a type specifier: ~S" - spec)))))))))) - -;;; Like VALUES-SPECIFIER-TYPE, except that we guarantee to never -;;; return a VALUES type. -(defun specifier-type (x) - (let ((res (values-specifier-type x))) - (when (values-type-p res) - (error "VALUES type illegal in this context:~% ~S" x)) - res)) - -;;; Similar to MACROEXPAND, but expands DEFTYPEs. We don't bother -;;; returning a second value. -(defun type-expand (form) - (let ((def (cond ((symbolp form) - (info :type :expander form)) - ((and (consp form) (symbolp (car form))) - (info :type :expander (car form))) - (t nil)))) - (if def - (type-expand (funcall def (if (consp form) form (list form)))) - form))) +;;;; representations of types ;;; A HAIRY-TYPE represents anything too weird to be described ;;; reasonably or to be useful, such as NOT, SATISFIES, unknown types, @@ -96,10 +23,11 @@ ;;; the original type spec. (defstruct (hairy-type (:include ctype (class-info (type-class-or-lose 'hairy)) - (enumerable t)) + (enumerable t) + (might-contain-other-types? t)) (:copier nil) #!+cmu (:pure nil)) - ;; the Common Lisp type-specifier + ;; the Common Lisp type-specifier of the type we represent (specifier nil :type t)) (!define-type-class hairy) @@ -134,31 +62,31 @@ (!define-type-class values) -(defstruct (function-type - (:include args-type - (class-info (type-class-or-lose 'function)))) - ;; True if the arguments are unrestrictive, i.e. *. +;;; (SPECIFIER-TYPE 'FUNCTION) and its subtypes +(defstruct (fun-type (:include args-type + (class-info (type-class-or-lose 'function)))) + ;; true if the arguments are unrestrictive, i.e. * (wild-args nil :type boolean) - ;; Type describing the return values. This is a values type + ;; type describing the return values. This is a values type ;; when multiple values were specified for the return. - (returns (required-argument) :type ctype)) + (returns (missing-arg) :type ctype)) -;;; The CONSTANT-TYPE structure represents a use of the -;;; CONSTANT-ARGUMENT "type specifier", which is only meaningful in -;;; function argument type specifiers used within the compiler. (It -;;; represents something that the compiler knows to be a constant.) +;;; The CONSTANT-TYPE structure represents a use of the CONSTANT-ARG +;;; "type specifier", which is only meaningful in function argument +;;; type specifiers used within the compiler. (It represents something +;;; that the compiler knows to be a constant.) (defstruct (constant-type (:include ctype (class-info (type-class-or-lose 'constant))) (:copier nil)) ;; The type which the argument must be a constant instance of for this type ;; specifier to win. - (type (required-argument) :type ctype)) + (type (missing-arg) :type ctype)) -;;; The NAMED-TYPE is used to represent *, T and NIL. These types must be -;;; super- or sub-types of all types, not just classes and * and NIL aren't -;;; classes anyway, so it wouldn't make much sense to make them built-in -;;; classes. +;;; The NAMED-TYPE is used to represent *, T and NIL. These types must +;;; be super- or sub-types of all types, not just classes and * and +;;; NIL aren't classes anyway, so it wouldn't make much sense to make +;;; them built-in classes. (defstruct (named-type (:include ctype (class-info (type-class-or-lose 'named))) (:copier nil)) @@ -286,7 +214,7 @@ ;; Is this not a simple array type? (:MAYBE means that we don't know.) (complexp :maybe :type (member t nil :maybe)) ;; the element type as originally specified - (element-type (required-argument) :type ctype) + (element-type (missing-arg) :type ctype) ;; the element type as it is specialized in this implementation (specialized-element-type *wild-type* :type ctype)) @@ -303,7 +231,8 @@ ;;; A COMPOUND-TYPE is a type defined out of a set of types, the ;;; common parent of UNION-TYPE and INTERSECTION-TYPE. -(defstruct (compound-type (:include ctype) +(defstruct (compound-type (:include ctype + (might-contain-other-types? t)) (:constructor nil) (:copier nil)) (types nil :type list :read-only t)) @@ -348,7 +277,7 @@ type)) ;;; A CONS-TYPE is used to represent a CONS type. -(defstruct (cons-type (:include ctype (:class-info (type-class-or-lose 'cons))) +(defstruct (cons-type (:include ctype (class-info (type-class-or-lose 'cons))) (:constructor ;; ANSI says that for CAR and CDR subtype ;; specifiers '* is equivalent to T. In order @@ -365,8 +294,82 @@ ;; the CAR and CDR element types (to support ANSI (CONS FOO BAR) types) ;; ;; FIXME: Most or all other type structure slots could also be :READ-ONLY. - (car-type (required-argument) :type ctype :read-only t) - (cdr-type (required-argument) :type ctype :read-only t)) + (car-type (missing-arg) :type ctype :read-only t) + (cdr-type (missing-arg) :type ctype :read-only t)) + +;;;; type utilities + +;;; Return the type structure corresponding to a type specifier. We +;;; pick off structure types as a special case. +;;; +;;; Note: VALUES-SPECIFIER-TYPE-CACHE-CLEAR must be called whenever a +;;; type is defined (or redefined). +(defun-cached (values-specifier-type + :hash-function (lambda (x) + (logand (sxhash x) #x3FF)) + :hash-bits 10 + :init-wrapper !cold-init-forms) + ((orig eq)) + (let ((u (uncross orig))) + (or (info :type :builtin u) + (let ((spec (type-expand u))) + (cond + ((and (not (eq spec u)) + (info :type :builtin spec))) + ((eq (info :type :kind spec) :instance) + (sb!xc:find-class spec)) + ((typep spec 'class) + ;; There doesn't seem to be any way to translate + ;; (TYPEP SPEC 'BUILT-IN-CLASS) into something which can be + ;; executed on the host Common Lisp at cross-compilation time. + #+sb-xc-host (error + "stub: (TYPEP SPEC 'BUILT-IN-CLASS) on xc host") + (if (typep spec 'built-in-class) + (or (built-in-class-translation spec) spec) + spec)) + (t + (let* (;; FIXME: This automatic promotion of FOO-style + ;; specs to (FOO)-style specs violates the ANSI + ;; standard. Unfortunately, we can't fix the + ;; problem just by removing it, since then things + ;; downstream should break. But at some point we + ;; should fix this and the things downstream too. + (lspec (if (atom spec) (list spec) spec)) + (fun (info :type :translator (car lspec)))) + (cond (fun + (funcall fun lspec)) + ((or (and (consp spec) (symbolp (car spec))) + (symbolp spec)) + (when (and *type-system-initialized* + (not (eq (info :type :kind spec) + :forthcoming-defclass-type))) + (signal 'parse-unknown-type :specifier spec)) + ;; (The RETURN-FROM here inhibits caching.) + (return-from values-specifier-type + (make-unknown-type :specifier spec))) + (t + (error "bad thing to be a type specifier: ~S" + spec)))))))))) + +;;; This is like VALUES-SPECIFIER-TYPE, except that we guarantee to +;;; never return a VALUES type. +(defun specifier-type (x) + (let ((res (values-specifier-type x))) + (when (values-type-p res) + (error "VALUES type illegal in this context:~% ~S" x)) + res)) + +;;; Similar to MACROEXPAND, but expands DEFTYPEs. We don't bother +;;; returning a second value. +(defun type-expand (form) + (let ((def (cond ((symbolp form) + (info :type :expander form)) + ((and (consp form) (symbolp (car form))) + (info :type :expander (car form))) + (t nil)))) + (if def + (type-expand (funcall def (if (consp form) form (list form)))) + form))) ;;; Note that the type NAME has been (re)defined, updating the ;;; undefined warnings and VALUES-SPECIFIER-TYPE cache. @@ -376,5 +379,5 @@ (when (boundp 'sb!kernel::*values-specifier-type-cache-vector*) (values-specifier-type-cache-clear)) (values)) - + (!defun-from-collected-cold-init-forms !early-type-cold-init)