3 ;;; C type representation implementation
5 ;;; (c) 2009 Straylight/Edgeware
8 ;;;----- Licensing notice ---------------------------------------------------
10 ;;; This file is part of the Sensible Object Design, an object system for C.
12 ;;; SOD is free software; you can redistribute it and/or modify
13 ;;; it under the terms of the GNU General Public License as published by
14 ;;; the Free Software Foundation; either version 2 of the License, or
15 ;;; (at your option) any later version.
17 ;;; SOD is distributed in the hope that it will be useful,
18 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;;; GNU General Public License for more details.
22 ;;; You should have received a copy of the GNU General Public License
23 ;;; along with SOD; if not, write to the Free Software Foundation,
24 ;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
28 ;;;--------------------------------------------------------------------------
31 (defparameter *c-type-intern-map* (make-hash-table :test #'equal)
32 "Hash table mapping lists describing types to their distinguished
35 (defun intern-c-type (class &rest initargs)
36 "If the CLASS and INITARGS have already been interned, then return the
37 existing object; otherwise make a new one."
38 (let ((list (cons (typecase class
39 ;; Canonify the class object; we'd prefer a name.
40 (standard-class (class-name class))
42 (let ((alist nil) (plist initargs))
43 ;; Canonify the initargs. Arrange for them to be in
44 ;; ascending order by name. This is annoying because
45 ;; a plist isn't a readily sortable sequence.
47 (when (null plist) (return))
48 (let ((name (pop plist)) (value (pop plist)))
49 (push (cons name value) alist)))
50 (dolist (assoc (sort alist #'string> :key #'car))
51 (push (cdr assoc) plist)
52 (push (car assoc) plist))
54 (or (gethash list *c-type-intern-map*)
55 (let ((new (apply #'make-instance class initargs)))
56 (setf (gethash new *c-type-intern-map*) t
57 (gethash list *c-type-intern-map*) new)))))
60 (defun check-type-intern-map ()
61 "Sanity check for the type-intern map."
62 (let ((map (make-hash-table)))
64 ;; Pass 1: check that interned types are consistent with their keys.
65 ;; Remember interned types.
66 (maphash (lambda (k v)
68 (let ((ty (apply #'make-instance k)))
69 (assert (c-type-equal-p ty v)))
70 (setf (gethash v map) t)))
73 ;; Pass 2: check that the interned type indicators are correct.
74 (maphash (lambda (k v)
76 (assert (gethash k *c-type-intern-map*)))
78 (maphash (lambda (k v)
80 (when (typep k 'c-type)
81 (assert (gethash k map))))
82 *c-type-intern-map*)))
84 (defun make-or-intern-c-type (new-type-class base-types &rest initargs)
85 "Return a possibly-new instance of NEW-TYPE-CLASS with the given INITARGS.
87 If all of the BASE-TYPES are interned, then use `intern-c-type' to
88 construct the new type; otherwise just make a new one with
89 `make-instance'. BASE-TYPES may be a singleton type, or a sequence of
91 (apply (if (if (typep base-types 'sequence)
93 (gethash type *c-type-intern-map*))
95 (gethash base-types *c-type-intern-map*))
96 #'intern-c-type #'make-instance)
100 ;;;--------------------------------------------------------------------------
103 (defmethod c-qualifier-keyword ((qualifier (eql :atomic))) "_Atomic")
105 (defmethod qualify-c-type ((type qualifiable-c-type) qualifiers)
106 (let ((initargs (instance-initargs type)))
107 (remf initargs :qualifiers)
108 (apply #'make-or-intern-c-type (class-of type) type
109 :qualifiers (canonify-qualifiers
110 (append qualifiers (c-type-qualifiers type)))
113 ;;;--------------------------------------------------------------------------
114 ;;; Storage specifiers.
116 (defmethod c-type-equal-p :around
117 ((type-a c-storage-specifiers-type) (type-b c-type))
118 "Ignore storage specifiers when comparing C types."
119 (c-type-equal-p (c-type-subtype type-a) type-b))
121 (defmethod c-type-equal-p :around
122 ((type-a c-type) (type-b c-storage-specifiers-type))
123 "Ignore storage specifiers when comparing C types."
124 (c-type-equal-p type-a (c-type-subtype type-b)))
126 (defun make-storage-specifiers-type (subtype specifiers)
127 "Construct a type based on SUBTYPE, carrying the storage SPECIFIERS."
128 (if (null specifiers) subtype
129 (make-or-intern-c-type 'c-storage-specifiers-type subtype
130 :specifiers specifiers
133 (defmethod pprint-c-type ((type c-storage-specifiers-type) stream kernel)
134 (dolist (spec (c-type-specifiers type))
135 (pprint-c-storage-specifier spec stream)
136 (write-char #\space stream)
137 (pprint-newline :miser stream))
138 (pprint-c-type (c-type-subtype type) stream kernel))
140 (defmethod print-c-type
141 (stream (type c-storage-specifiers-type) &optional colon atsign)
142 (declare (ignore colon atsign))
143 (format stream "~:@<SPECS ~@_~:I~/sod:print-c-type/~
144 ~{ ~_~/sod:print-c-storage-specifier/~}~:>"
145 (c-type-subtype type) (c-type-specifiers type)))
148 (define-c-type-syntax specs (subtype &rest specifiers)
149 `(make-storage-specifiers-type
150 ,(expand-c-type-spec subtype)
151 (list ,@(mapcar #'expand-c-storage-specifier specifiers))))
153 ;;;--------------------------------------------------------------------------
154 ;;; Some storage specifiers.
156 (export 'alignas-storage-specifier)
157 (defclass alignas-storage-specifier ()
158 ((alignment :initarg :alignment :reader spec-alignment)))
161 (define-c-storage-specifier-syntax alignas (alignment)
162 `(make-instance 'alignas-storage-specifier :alignment ,alignment))
164 (defmethod print-c-storage-specifier
165 (stream (spec alignas-storage-specifier) &optional colon atsign)
166 (declare (ignore colon atsign))
167 (format stream "~:@<~S ~_~S~:>" 'alignas (spec-alignment spec)))
169 (defmethod pprint-c-storage-specifier
170 ((spec alignas-storage-specifier) stream)
171 (format stream "_Alignas(~A)" (spec-alignment spec)))
173 ;;;--------------------------------------------------------------------------
178 (export '(simple-c-type c-type-name))
179 (defclass simple-c-type (qualifiable-c-type)
180 ((name :initarg :name :type string :reader c-type-name))
182 "C types with simple forms."))
184 ;; Constructor function and interning.
186 (export 'make-simple-type)
187 (defun make-simple-type (name &optional qualifiers)
188 "Make a distinguished object for the simple type called NAME."
189 (intern-c-type 'simple-c-type
191 :qualifiers (canonify-qualifiers qualifiers)))
193 ;; Comparison protocol.
195 (defmethod c-type-equal-p and
196 ((type-a simple-c-type) (type-b simple-c-type))
197 (string= (c-type-name type-a) (c-type-name type-b)))
199 ;; C syntax output protocol.
201 (defmethod pprint-c-type ((type simple-c-type) stream kernel)
202 (pprint-logical-block (stream nil)
203 (format stream "~{~A ~@_~}~A"
204 (c-type-qualifier-keywords type)
206 (funcall kernel stream 0 t)))
208 ;; S-expression notation protocol.
210 (defparameter *simple-type-map* (make-hash-table)
211 "Hash table mapping strings of C syntax to symbolic names.")
213 (defmethod print-c-type (stream (type simple-c-type) &optional colon atsign)
214 (declare (ignore colon atsign))
215 (let* ((name (c-type-name type))
216 (symbol (gethash name *simple-type-map*)))
217 (format stream "~:[~S~;~:@<~S~0@*~{ ~_~S~}~:>~]"
218 (c-type-qualifiers type) (or symbol name))))
220 (eval-when (:compile-toplevel :load-toplevel :execute)
221 (defmethod expand-c-type-spec ((spec string))
222 `(make-simple-type ,spec))
223 (defmethod expand-c-type-form ((head string) tail)
224 `(make-simple-type ,head (list ,@tail))))
226 (export 'define-simple-c-type)
227 (defmacro define-simple-c-type (names type &key export)
228 "Define each of NAMES to be a simple type called TYPE."
229 (let ((names (if (listp names) names (list names))))
231 (setf (gethash ,type *simple-type-map*) ',(car names))
232 (defctype ,names ,type :export ,export)
233 (define-c-type-syntax ,(car names) (&rest quals)
234 `(make-simple-type ,',type (list ,@quals))))))
238 (define-simple-c-type void "void" :export t)
240 (define-simple-c-type char "char" :export t)
241 (define-simple-c-type (unsigned-char uchar) "unsigned char" :export t)
242 (define-simple-c-type (signed-char schar) "signed char" :export t)
243 (define-simple-c-type wchar-t "wchar_t" :export t)
245 (define-simple-c-type (int signed signed-int sint) "int" :export t)
246 (define-simple-c-type (unsigned unsigned-int uint) "unsigned" :export t)
248 (define-simple-c-type (short signed-short short-int signed-short-int sshort)
250 (define-simple-c-type (unsigned-short unsigned-short-int ushort)
251 "unsigned short" :export t)
253 (define-simple-c-type (long signed-long long-int signed-long-int slong)
255 (define-simple-c-type (unsigned-long unsigned-long-int ulong)
256 "unsigned long" :export t)
258 (define-simple-c-type (long-long signed-long-long long-long-int
259 signed-long-long-int llong sllong)
260 "long long" :export t)
261 (define-simple-c-type (unsigned-long-long unsigned-long-long-int ullong)
262 "unsigned long long" :export t)
264 (define-simple-c-type float "float" :export t)
265 (define-simple-c-type double "double" :export t)
266 (define-simple-c-type long-double "long double" :export t)
268 (define-simple-c-type bool "_Bool" :export t)
270 (define-simple-c-type float-complex "float _Complex" :export t)
271 (define-simple-c-type double-complex "double _Complex" :export t)
272 (define-simple-c-type long-double-complex "long double _Complex" :export t)
274 (define-simple-c-type float-imaginary "float _Imaginary" :export t)
275 (define-simple-c-type double-imaginary "double _Imaginary" :export t)
276 (define-simple-c-type long-double-imaginary
277 "long double _Imaginary" :export t)
279 (define-simple-c-type va-list "va_list" :export t)
280 (define-simple-c-type size-t "size_t" :export t)
281 (define-simple-c-type ptrdiff-t "ptrdiff_t" :export t)
283 ;;;--------------------------------------------------------------------------
284 ;;; Tagged types (enums, structs and unions).
288 (export '(tagged-c-type c-type-tag))
289 (defclass tagged-c-type (qualifiable-c-type)
290 ((tag :initarg :tag :type string :reader c-type-tag))
292 "C types with tags."))
294 ;; Subclass definitions.
296 (export 'c-tagged-type-kind)
297 (defgeneric c-tagged-type-kind (type)
299 "Return the kind of tagged type that TYPE is, as a keyword."))
301 (export 'kind-c-tagged-type)
302 (defgeneric kind-c-tagged-type (kind)
304 "Given a keyword KIND, return the appropriate class name."))
306 (export 'make-c-tagged-type)
307 (defun make-c-tagged-type (kind tag &optional qualifiers)
308 "Return a tagged type with the given KIND (keyword) and TAG (string)."
309 (intern-c-type (kind-c-tagged-type kind)
311 :qualifiers (canonify-qualifiers qualifiers)))
313 (macrolet ((define-tagged-type (kind what)
314 (let* ((type (symbolicate 'c- kind '-type))
315 (keyword (intern (symbol-name kind) :keyword))
316 (constructor (symbolicate 'make- kind '-type)))
318 (export '(,type ,kind ,constructor))
319 (defclass ,type (tagged-c-type) ()
320 (:documentation ,(format nil "C ~a types." what)))
321 (defmethod c-tagged-type-kind ((type ,type))
323 (defmethod kind-c-tagged-type ((kind (eql ',keyword)))
325 (defun ,constructor (tag &optional qualifiers)
326 (intern-c-type ',type :tag tag
327 :qualifiers (canonify-qualifiers
329 (define-c-type-syntax ,kind (tag &rest quals)
330 ,(format nil "Construct ~A type named TAG" what)
331 `(,',constructor ,tag (list ,@quals)))))))
332 (define-tagged-type enum "enumerated")
333 (define-tagged-type struct "structure")
334 (define-tagged-type union "union"))
336 ;; Comparison protocol.
338 (defmethod c-type-equal-p and ((type-a tagged-c-type) (type-b tagged-c-type))
339 (string= (c-type-tag type-a) (c-type-tag type-b)))
341 ;; C syntax output protocol.
343 (defmethod pprint-c-type ((type tagged-c-type) stream kernel)
344 (pprint-logical-block (stream nil)
345 (format stream "~{~A ~@_~}~(~A~) ~A"
346 (c-type-qualifier-keywords type)
347 (c-tagged-type-kind type)
349 (funcall kernel stream 0 t)))
351 ;; S-expression notation protocol.
353 (defmethod print-c-type (stream (type tagged-c-type) &optional colon atsign)
354 (declare (ignore colon atsign))
355 (format stream "~:@<~S ~@_~S~{ ~_~S~}~:>"
356 (c-tagged-type-kind type)
358 (c-type-qualifiers type)))
360 ;;;--------------------------------------------------------------------------
365 (export 'c-atomic-type)
366 (defclass c-atomic-type (qualifiable-c-type)
367 ((subtype :initarg :subtype :type c-type :reader c-type-subtype))
368 (:documentation "C atomic types."))
370 ;; Constructor function.
372 (export 'make-atomic-type)
373 (defun make-atomic-type (subtype &optional qualifiers)
374 "Return a (maybe distinguished) atomic type."
375 (make-or-intern-c-type 'c-atomic-type subtype
377 :qualifiers (canonify-qualifiers qualifiers)))
379 ;; Comparison protocol.
381 (defmethod c-type-equal-p and ((type-a c-atomic-type) (type-b c-atomic-type))
382 (c-type-equal-p (c-type-subtype type-a) (c-type-subtype type-b)))
384 ;; C-syntax output protocol.
386 (defmethod pprint-c-type ((type c-atomic-type) stream kernel)
387 (pprint-logical-block (stream nil)
388 (format stream "~{~A ~@_~}" (c-type-qualifier-keywords type))
389 (write-string "_Atomic(" stream)
390 (pprint-indent :current 0 stream)
391 (pprint-c-type (c-type-subtype type) stream
392 (lambda (stream prio spacep)
393 (declare (ignore stream prio spacep))))
394 (write-char #\) stream)))
396 ;; S-expression notation protocol.
398 (defmethod print-c-type (stream (type c-atomic-type) &optional colon atsign)
399 (declare (ignore colon atsign))
400 (format stream "~:@<ATOMIC ~@_~/sod:print-c-type/~{ ~_~S~}~:>"
401 (c-type-subtype type)
402 (c-type-qualifiers type)))
405 (define-c-type-syntax atomic (sub &rest quals)
406 "Return the type of atomic SUB."
407 `(make-atomic-type ,(expand-c-type-spec sub) (list ,@quals)))
409 ;;;--------------------------------------------------------------------------
414 (export 'c-pointer-type)
415 (defclass c-pointer-type (qualifiable-c-type)
416 ((subtype :initarg :subtype :type c-type :reader c-type-subtype))
417 (:documentation "C pointer types."))
419 ;; Constructor function.
421 (export 'make-pointer-type)
422 (defun make-pointer-type (subtype &optional qualifiers)
423 "Return a (maybe distinguished) pointer type."
424 (make-or-intern-c-type 'c-pointer-type subtype
426 :qualifiers (canonify-qualifiers qualifiers)))
428 ;; Comparison protocol.
430 (defmethod c-type-equal-p and ((type-a c-pointer-type)
431 (type-b c-pointer-type))
432 (c-type-equal-p (c-type-subtype type-a) (c-type-subtype type-b)))
434 ;; C syntax output protocol.
436 (defmethod pprint-c-type ((type c-pointer-type) stream kernel)
437 (pprint-c-type (c-type-subtype type) stream
438 (lambda (stream prio spacep)
439 (when spacep (c-type-space stream))
440 (maybe-in-parens (stream (> prio 1))
441 (format stream "*~{~A~^ ~@_~}"
442 (c-type-qualifier-keywords type))
443 (funcall kernel stream 1 (c-type-qualifiers type))))))
445 ;; S-expression notation protocol.
447 (defmethod print-c-type (stream (type c-pointer-type) &optional colon atsign)
448 (declare (ignore colon atsign))
449 (format stream "~:@<* ~@_~/sod:print-c-type/~{ ~_~S~}~:>"
450 (c-type-subtype type)
451 (c-type-qualifiers type)))
453 (export '(* pointer ptr))
454 (define-c-type-syntax * (sub &rest quals)
455 "Return the type of pointer-to-SUB."
456 `(make-pointer-type ,(expand-c-type-spec sub) (list ,@quals)))
457 (c-type-alias * pointer ptr)
461 (export '(string const-string))
462 (defctype string (* char))
463 (defctype const-string (* (char :const)))
465 ;;;--------------------------------------------------------------------------
470 (export '(c-array-type c-array-dimensions))
471 (defclass c-array-type (c-type)
472 ((subtype :initarg :subtype :type c-type :reader c-type-subtype)
473 (dimensions :initarg :dimensions :type list :reader c-array-dimensions))
477 ;; Constructor function.
479 (export 'make-array-type)
480 (defun make-array-type (subtype dimensions)
481 "Return a new array of SUBTYPE with given DIMENSIONS."
482 (make-instance 'c-array-type :subtype subtype
483 :dimensions (or dimensions '(nil))))
485 ;; Comparison protocol.
487 (defmethod c-type-equal-p and ((type-a c-array-type) (type-b c-array-type))
489 ;; Messy. C doesn't have multidimensional arrays, but we fake them for
490 ;; convenience's sake. But it means that we have to arrange for
491 ;; multidimensional arrays to equal vectors of vectors -- and in general
492 ;; for multidimensional arrays of multidimensional arrays to match each
493 ;; other properly, even when their dimensions don't align precisely.
494 (labels ((check (sub-a dim-a sub-b dim-b)
497 (c-type-equal-p sub-a sub-b))
498 ((typep sub-a 'c-array-type)
499 (check (c-type-subtype sub-a)
500 (c-array-dimensions sub-a)
505 (check sub-b dim-b sub-a dim-a))
506 ((equal (car dim-a) (car dim-b))
507 (check sub-a (cdr dim-a) sub-b (cdr dim-b)))
510 (check (c-type-subtype type-a) (c-array-dimensions type-a)
511 (c-type-subtype type-b) (c-array-dimensions type-b))))
513 ;; C syntax output protocol.
515 (defmethod pprint-c-type ((type c-array-type) stream kernel)
516 (pprint-c-type (c-type-subtype type) stream
517 (lambda (stream prio spacep)
518 (maybe-in-parens (stream (> prio 2))
519 (funcall kernel stream 2 spacep)
520 (format stream "~@<~{[~@[~A~]]~^~_~}~:>"
521 (c-array-dimensions type))))))
523 ;; S-expression notation protocol.
525 (defmethod print-c-type (stream (type c-array-type) &optional colon atsign)
526 (declare (ignore colon atsign))
527 (format stream "~:@<[] ~@_~:I~/sod:print-c-type/~{ ~_~S~}~:>"
528 (c-type-subtype type)
529 (c-array-dimensions type)))
531 (export '([] array vec))
532 (define-c-type-syntax [] (sub &rest dims)
533 "Return the type of arrays of SUB with the dimensions DIMS.
535 If the DIMS are omitted, a single unknown-length dimension is added."
536 `(make-array-type ,(expand-c-type-spec sub)
537 (list ,@(or dims '(nil)))))
538 (c-type-alias [] array vec)
540 ;;;--------------------------------------------------------------------------
543 ;; Function arguments.
545 (defun argument-lists-equal-p (list-a list-b)
546 "Return whether LIST-A and LIST-B match.
548 They must have the same number of arguments, and each argument must have
549 the same type, or be `:ellipsis'. The argument names are not inspected."
550 (and (= (length list-a) (length list-b))
551 (every (lambda (arg-a arg-b)
552 (if (eq arg-a :ellipsis)
554 (and (argumentp arg-a) (argumentp arg-b)
555 (c-type-equal-p (argument-type arg-a)
556 (argument-type arg-b)))))
559 (defun fix-and-check-keyword-argument-list (list)
560 "Check the keyword argument LIST is valid; if so, fix it up and return it.
562 Check that the keyword arguments have distinct names. Fix the list up by
563 sorting it by keyword name."
565 (unless (every #'argumentp list)
566 (error "(INTERNAL) not an argument value"))
568 (let ((list (sort (copy-list list) #'string< :key #'argument-name)))
569 (do ((list (cdr list) (cdr list))
570 (this (car list) (car list))
574 (let ((this-name (argument-name this))
575 (prev-name (argument-name prev)))
576 (when (string= this-name prev-name)
577 (error "Duplicate keyword argument name `~A'." this-name)))))
580 (export 'merge-keyword-lists)
581 (defun merge-keyword-lists (lists)
582 "Return the union of keyword argument lists.
584 The LISTS parameter consists of pairs (ARGS . WHAT), where ARGS is a list
585 of `argument' objects, and WHAT is either nil or a printable object
586 describing the origin of the corresponding argument list suitable for
587 quoting in an error message.
589 The resulting list contains exactly one argument for each distinct
590 argument name appearing in the input lists; this argument will contain the
591 default value corresponding to the name's earliest occurrence in the input
594 If the same name appears in multiple input lists with different types, an
595 error is signalled; this error will quote the origins of a representative
596 conflicting pair of arguments."
598 ;; The easy way through all of this is with a hash table mapping argument
599 ;; names to (ARGUMENT . WHAT) pairs.
601 (let ((argmap (make-hash-table :test #'equal)))
603 ;; Set up the table. When we find a duplicate, check that the types
606 (let ((args (car item))
609 (let* ((name (argument-name arg))
610 (other-item (gethash name argmap)))
611 (if (null other-item)
612 (setf (gethash name argmap) (cons arg what))
613 (let* ((type (argument-type arg))
614 (other (car other-item))
615 (other-type (argument-type other))
616 (other-what (cdr other-item)))
617 (unless (c-type-equal-p type other-type)
618 (error "Type mismatch for keyword argument `~A': ~
619 ~A~@[ (~A)~] doesn't match ~A~@[ (~A)~]."
622 other-type other-what))))))))
624 ;; Now it's just a matter of picking the arguments out again.
626 (maphash (lambda (name item)
627 (declare (ignore name))
628 (push (car item) result))
630 (fix-and-check-keyword-argument-list result))))
634 (export '(c-function-type c-function-arguments))
635 (defclass c-function-type (c-type)
636 ((subtype :initarg :subtype :type c-type :reader c-type-subtype)
637 (arguments :type list :reader c-function-arguments))
639 "C function types. The subtype is the return type, as implied by the C
640 syntax for function declarations."))
642 (defmethod shared-initialize :after
643 ((type c-function-type) slot-names &key (arguments nil argsp))
644 (declare (ignore slot-names))
646 (setf (slot-value type 'arguments)
648 (null (cdr arguments))
649 (not (eq (car arguments) :ellipsis))
650 (eq (argument-type (car arguments)) c-type-void))
654 (export '(c-keyword-function-type c-function-keywords))
655 (defclass c-keyword-function-type (c-function-type)
656 ((keywords :initarg :keywords :type list
657 :reader c-function-keywords))
659 "C function types for `functions' which take keyword arguments."))
661 (defmethod shared-initialize :after
662 ((type c-keyword-function-type) slot-names &key (keywords nil keysp))
663 (declare (ignore slot-names))
665 (setf (slot-value type 'keywords)
666 (fix-and-check-keyword-argument-list keywords))))
668 ;; Constructor function.
670 (export 'make-function-type)
671 (defun make-function-type (subtype arguments)
672 "Return a new function type, returning SUBTYPE and accepting ARGUMENTS.
674 As a helper for dealing with the S-expression syntax for keyword
675 functions, if ARGUMENTS has the form (ARGS ... :keys KEYWORDS ...)' then
676 return a keyword function with arguments (ARGS ...) and keywords (KEYWORDS
678 (let ((split (member :keys arguments)))
680 (make-instance 'c-keyword-function-type
682 :arguments (ldiff arguments split)
683 :keywords (cdr split))
684 (make-instance 'c-function-type
686 :arguments arguments))))
688 (export 'make-keyword-function-type)
689 (defun make-keyword-function-type (subtype arguments keywords)
690 "Return a new keyword-function type, returning SUBTYPE and accepting
691 ARGUMENTS and KEYWORDS."
692 (make-instance 'c-keyword-function-type :subtype subtype
693 :arguments arguments :keywords keywords))
695 ;; Comparison protocol.
697 (defmethod c-type-equal-p and
698 ((type-a c-function-type) (type-b c-function-type))
699 (and (c-type-equal-p (c-type-subtype type-a) (c-type-subtype type-b))
700 (argument-lists-equal-p (c-function-arguments type-a)
701 (c-function-arguments type-b))))
703 (defmethod c-type-equal-p and
704 ((type-a c-keyword-function-type) (type-b c-keyword-function-type))
705 ;; Actually, there's nothing to check here. I'm happy as long as both
706 ;; functions notionally accept keyword arguments.
709 ;; C syntax output protocol.
711 (export 'pprint-c-function-type)
712 (defun pprint-c-function-type (return-type stream print-args print-kernel)
713 "Common top-level printing for function types.
715 Prints RETURN-TYPE (KERNEL(ARGS)), where RETURN-TYPE is the actual return
716 type, and ARGS and KERNEL are whatever is printed by the PRINT-ARGS and
717 PRINT-KERNEL functions.
719 The PRINT-KERNEL function is the standard such thing for the
720 `pprint-c-type' protocol; PRINT-ARGS accepts just an output stream."
721 (pprint-c-type return-type stream
722 (lambda (stream prio spacep)
723 (maybe-in-parens (stream (> prio 2))
724 (when spacep (c-type-space stream))
725 (funcall print-kernel stream 2 nil)
726 (pprint-indent :block 4 stream)
727 (pprint-newline :linear stream)
728 (pprint-logical-block
729 (stream nil :prefix "(" :suffix ")")
730 (funcall print-args stream))))))
732 (export 'pprint-argument-list)
733 (defun pprint-argument-list (args stream)
734 "Print an argument list.
736 The ARGS is a list of `argument' objects, optionally containing an
737 `:ellipsis' marker. The output is written to STREAM.
739 Returns non-nil if any arguments were actually printed."
741 (pprint-logical-block (stream nil)
744 (format stream ", ~_")
748 (write-string "..." stream))
750 (pprint-logical-block (stream nil)
751 (pprint-c-type (argument-type arg) stream (argument-name arg))
752 (let ((default (argument-default arg)))
754 (format stream " = ~2I~_~A" default))))))))
757 (let ((void-arglist (list (make-argument nil c-type-void))))
758 (defmethod pprint-c-type ((type c-function-type) stream kernel)
759 (let ((args (or (c-function-arguments type) void-arglist)))
760 (pprint-c-function-type (c-type-subtype type) stream
762 (pprint-argument-list args stream))
765 (defmethod pprint-c-type ((type c-keyword-function-type) stream kernel)
766 (let ((args (c-function-arguments type))
767 (keys (c-function-keywords type)))
768 (pprint-c-function-type (c-type-subtype type) stream
770 (when (pprint-argument-list args stream)
771 (format stream ", ~_"))
772 (write-char #\? stream)
773 (pprint-argument-list keys stream))
776 ;; S-expression notation protocol.
778 (defmethod print-c-type
779 (stream (type c-function-type) &optional colon atsign)
780 (declare (ignore colon atsign))
781 (format stream "~:@<~
783 ~/sod:print-c-type/~:[~; ~]~:*~_~
784 ~<~@{~:<~S ~@_~/sod:print-c-type/~:>~^ ~_~}~:>~
785 ~:[~2*~; ~_~S ~@_~<~@{~:<~S ~@_~/sod:print-c-type/~
786 ~@[ ~@_~S~]~:>~^ ~_~}~:>~]~
788 (c-type-subtype type)
789 (mapcar (lambda (arg)
790 (if (eq arg :ellipsis) arg
791 (list (argument-name arg) (argument-type arg))))
792 (c-function-arguments type))
793 (typep type 'c-keyword-function-type)
795 (and (typep type 'c-keyword-function-type)
796 (mapcar (lambda (arg)
797 (list (argument-name arg)
799 (argument-default arg)))
800 (c-function-keywords type)))))
802 (export '(fun function () func fn))
803 (define-c-type-syntax fun (ret &rest args)
804 "Return the type of functions which returns RET and has arguments ARGS.
806 The ARGS are a list of arguments of the form (NAME TYPE [DEFAULT]). The
807 NAME can be NIL to indicate that no name was given.
809 If an entry isn't a list, it's assumed to be the start of a Lisp
810 expression to compute the tail of the list; similarly, if the list is
811 improper, then it's considered to be a complete expression. The upshot of
812 this apparently bizarre rule is that you can say
814 (c-type (fun int (\"foo\" int) . arg-tail))
816 where ARG-TAIL is (almost) any old Lisp expression and have it tack the
817 arguments onto the end. Of course, there don't have to be any explicit
818 arguments at all. The only restriction is that the head of the Lisp form
819 can't be a list -- so ((lambda (...) ...) ...) is out, but you probably
820 wouldn't type that anyway."
822 `(make-function-type ,(expand-c-type-spec ret)
823 ,(do ((args args (cdr args))
825 (if (keywordp (car args))
826 (cons (car args) list)
827 (let* ((name (caar args))
828 (type (expand-c-type-spec
830 (default (and (cddar args)
833 ,name ,type ,default)))
836 (and (atom (car args))
837 (not (keywordp (car args)))))
838 (cond ((and (null args) (null list)) `nil)
839 ((null args) `(list ,@(nreverse list)))
841 (t `(list* ,@(nreverse list) ,args)))))))
842 (c-type-alias fun function () func fn)
844 ;; Additional utilities for dealing with functions.
846 (export 'commentify-argument-names)
847 (defun commentify-argument-names (arguments)
848 "Return an argument list with the arguments commentified.
850 That is, with each argument name passed through
851 `commentify-argument-name'."
852 (mapcar (lambda (arg)
853 (if (eq arg :ellipsis) arg
854 (make-argument (commentify-argument-name (argument-name arg))
856 (argument-default arg))))
859 (export 'commentify-function-type)
860 (defun commentify-function-type (type)
861 "Return a type like TYPE, but with arguments commentified.
863 This doesn't recurse into the return type or argument types."
864 (make-function-type (c-type-subtype type)
865 (commentify-argument-names
866 (c-function-arguments type))))
868 (export 'reify-variable-argument-tail)
869 (defun reify-variable-argument-tail (arguments)
870 "Replace any `:ellipsis' item in ARGUMENTS with a `va_list' argument.
872 The argument's name is taken from the variable `*sod-ap*'."
873 (substitute (make-argument *sod-ap* c-type-va-list) :ellipsis arguments))
875 ;;;----- That's all, folks --------------------------------------------------