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;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
;;;
;;; grovel.lisp --- The CFFI Groveller.
;;;
;;; Copyright (C) 2005-2006, Dan Knap <dankna@accela.net>
;;; Copyright (C) 2005-2006, Emily Backes <lucca@accela.net>
;;; Copyright (C) 2007, Stelian Ionescu <sionescu@cddr.org>
;;; Copyright (C) 2007, Luis Oliveira <loliveira@common-lisp.net>
;;;
;;; Permission is hereby granted, free of charge, to any person
;;; obtaining a copy of this software and associated documentation
;;; files (the "Software"), to deal in the Software without
;;; restriction, including without limitation the rights to use, copy,
;;; modify, merge, publish, distribute, sublicense, and/or sell copies
;;; of the Software, and to permit persons to whom the Software is
;;; furnished to do so, subject to the following conditions:
;;;
;;; The above copyright notice and this permission notice shall be
;;; included in all copies or substantial portions of the Software.
;;;
;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
;;; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
;;; DEALINGS IN THE SOFTWARE.
;;;
(in-package #:cffi-grovel)
;;;# Utils
(defun trim-whitespace (strings)
(loop for s in strings
;;;# Error Conditions
;;; This warning is signalled when cffi-grovel can't find some macro.
;;; Signalled by CONSTANT or CONSTANTENUM.
(define-condition missing-definition (warning)
((%name :initarg :name :reader name-of))
(:report (lambda (condition stream)
(format stream "No definition for ~A"
(name-of condition)))))
;;;# Grovelling
;;; The header of the intermediate C file.
(defparameter *header*
"/*
* This file has been automatically generated by cffi-grovel.
* Do not edit it by hand.
*/
")
;;; C code generated by cffi-grovel is inserted between the contents
;;; of *PROLOGUE* and *POSTSCRIPT*, inside the main function's body.
(defparameter *prologue*
"
#include <grovel/common.h>
int autotype_tmp;
FILE *output = argc > 1 ? fopen(argv[1], \"w\") : stdout;
fprintf(output, \";;;; This file has been automatically generated by \"
\"cffi-grovel.\\n;;;; Do not edit it by hand.\\n\\n\");
")
(defparameter *postscript*
"
if (output != stdout)
fclose(output);
return 0;
}
")
(defun unescape-for-c (text)
(with-output-to-string (result)
(loop for i below (length text)
for char = (char text i) do
(cond ((eql char #\") (princ "\\\"" result))
((eql char #\newline) (princ "\\n" result))
(t (princ char result))))))
(defun c-format (out fmt &rest args)
(let ((text (unescape-for-c (format nil "~?" fmt args))))
(format out "~& fputs(\"~A\", output);~%" text)))
(defun c-printf (out fmt &rest args)
(flet ((item (item)
(format out "~A" (unescape-for-c (format nil item)))))
(format out "~& fprintf(output, \"")
(item fmt)
(format out "\"")
(loop for arg in args do
(format out ", ")
(item arg))
(format out ");~%")))
;;; TODO: handle packages in a better way. One way is to process each
;;; grovel form as it is read (like we already do for wrapper
;;; forms). This way in can expect *PACKAGE* to have sane values.
;;; This would require that "header forms" come before any other
;;; forms.
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(defun c-print-symbol (out symbol &optional no-package)
(c-format out
(let ((package (symbol-package symbol)))
(cond
((eq (find-package '#:keyword) package) ":~(~A~)")
(no-package "~(~A~)")
((eq (find-package '#:cl) package) "cl:~(~A~)")
(t "~(~A~)")))
symbol))
(defun c-write (out form &key recursive)
(cond
((and (listp form)
(eq 'quote (car form)))
(c-format out "'")
(c-write out (cadr form) :recursive t))
((listp form)
(c-format out "(")
(loop for subform in form
for first-p = t then nil
unless first-p do (c-format out " ")
do (c-write out subform :recursive t))
(c-format out ")"))
((symbolp form)
(c-print-symbol out form)))
(unless recursive
(c-format out "~%")))
;;; Always NIL for now, add {ENABLE,DISABLE}-AUTO-EXPORT grovel forms
;;; later, if necessary.
(defvar *auto-export* nil)
(when (and *auto-export* (not (keywordp symbol)))
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(c-format out "(cl:export '")
(c-print-symbol out symbol t)
(c-format out ")~%")))
(defun c-section-header (out section-type section-symbol)
(format out "~% /* ~A section for ~S */~%"
section-type
section-symbol))
(defun remove-suffix (string suffix)
(let ((suffix-start (- (length string) (length suffix))))
(if (and (> suffix-start 0)
(string= string suffix :start1 suffix-start))
(subseq string 0 suffix-start)
string)))
(defun strcat (&rest strings)
(apply #'concatenate 'string strings))
(defgeneric %process-grovel-form (name out arguments)
(:method (name out arguments)
(declare (ignore out arguments))
(error "Unknown Grovel syntax: ~S" name)))
(defun process-grovel-form (out form)
(%process-grovel-form (form-kind form) out (cdr form)))
(defun form-kind (form)
;; Using INTERN here instead of FIND-SYMBOL will result in less
;; cryptic error messages when an undefined grovel/wrapper form is
;; found.
(defvar *header-forms* '(c include define flag typedef))
(member (form-kind form) *header-forms*))
(defun generate-c-file (input-file output-defaults)
(let ((c-file (make-pathname :type "c" :defaults output-defaults)))
(with-open-file (out c-file :direction :output :if-exists :supersede)
(with-open-file (in input-file :direction :input)
(flet ((read-forms (s)
(do ((forms ())
(form (read s nil nil) (read s nil nil)))
((null form) (nreverse forms))
(labels
((process-form (f)
(case (form-kind f)
(flag (warn "Groveler clause FLAG is deprecated, use CC-FLAGS instead.")))
(case (form-kind f)
(in-package
(setf *package* (find-package (second f)))
(push f forms))
(progn
;; flatten progn forms
(mapc #'process-form (rest f)))
(t (push f forms)))))
(process-form form)))))
(let* ((forms (read-forms in))
(header-forms (remove-if-not #'header-form-p forms))
(body-forms (remove-if #'header-form-p forms)))
(write-string *header* out)
(dolist (form header-forms)
(process-grovel-form out form))
(write-string *prologue* out)
(dolist (form body-forms)
(process-grovel-form out form))
(write-string *postscript* out)))))
(defparameter *exe-extension* #-windows nil #+windows "exe")
(let ((path (make-pathname :type *exe-extension*
:defaults defaults)))
;; It's necessary to prepend "./" to relative paths because some
;; implementations of INVOKE use a shell.
(when (or (not (pathname-directory path))
(eq :relative (car (pathname-directory path))))
(setf path (make-pathname
:directory (list* :relative "."
(cdr (pathname-directory path)))
:defaults path)))
path))
(defun tmp-lisp-filename (defaults)
(make-pathname :name (strcat (pathname-name defaults) ".grovel-tmp")
:type "lisp" :defaults defaults))
(cffi:defcfun "getenv" :string
(name :string))
(defparameter *cc*
#+(or cygwin (not windows)) "cc"
#+(and windows (not cygwin)) "c:/msys/1.0/bin/gcc.exe")
(defparameter *cc-flags*
(append
;; For MacPorts
#+darwin (list "-I" "/opt/local/include/")
#-darwin nil
;; ECL internal flags
#+ecl (list c::*cc-flags*)
;; FreeBSD non-base header files
#+freebsd (list "-I" "/usr/local/include/")))
;;; FIXME: is there a better way to detect whether these flags
;;; are necessary?
(defparameter *cpu-word-size-flags*
(ecase (cffi:foreign-type-size :pointer)
(4 (list "-m32"))
(8 (list "-m64"))))
(list #+darwin "-bundle"
#-darwin "-shared"
#-windows "-fPIC"))
(defun cc-compile-and-link (input-file output-file &key library)
(let ((arglist
`(,(or (getenv "CC") *cc*)
,@*cpu-word-size-flags*
,@*cc-flags*
;; add the cffi directory to the include path to make common.h visible
,(format nil "-I~A"
(directory-namestring
(truename
(asdf:system-definition-pathname :cffi-grovel))))
,@(when library *platform-library-flags*)
"-o" ,(native-namestring output-file)
,(native-namestring input-file))))
(when library
;; if it's a library that may be used, remove it
;; so we won't possibly be overwriting the code of any existing process
(ignore-some-conditions (file-error)
(delete-file output-file)))
;;; *PACKAGE* is rebound so that the IN-PACKAGE form can set it during
;;; *the extent of a given grovel file.
(defun process-grovel-file (input-file &optional (output-defaults input-file))
(with-standard-io-syntax
(let* ((c-file (generate-c-file input-file output-defaults))
(exe-file (exe-filename c-file))
(lisp-file (tmp-lisp-filename c-file)))
(cc-compile-and-link c-file exe-file)
(invoke exe-file (native-namestring lisp-file))
lisp-file)))
;;; OUT is lexically bound to the output stream within BODY.
(defmacro define-grovel-syntax (name lambda-list &body body)
(with-unique-names (name-var args)
`(defmethod %process-grovel-form ((,name-var (eql ',name)) out ,args)
(destructuring-bind ,lambda-list ,args
,@body))))
(define-grovel-syntax c (body)
(format out "~%~A~%" body))
(define-grovel-syntax include (&rest includes)
(format out "~{#include <~A>~%~}" includes))
(define-grovel-syntax define (name &optional value)
(format out "#define ~A~@[ ~A~]~%" name value))
(define-grovel-syntax typedef (base-type new-type)
(format out "typedef ~A ~A;~%" base-type new-type))
;;; Is this really needed?
(define-grovel-syntax ffi-typedef (new-type base-type)
(c-format out "(cffi:defctype ~S ~S)~%" new-type base-type))
(define-grovel-syntax flag (&rest flags)
(appendf *cc-flags* (trim-whitespace flags)))
(define-grovel-syntax cc-flags (&rest flags)
(appendf *cc-flags* (trim-whitespace flags)))
;;; This form also has some "read time" effects. See GENERATE-C-FILE.
(c-format out "(cl:in-package #:~A)~%~%" name))
(define-grovel-syntax ctype (lisp-name size-designator)
(c-section-header out "ctype" lisp-name)
(c-export out lisp-name)
(c-format out "(cffi:defctype ")
(c-print-symbol out lisp-name t)
(c-format out " ")
(format out "~& type_name(output, TYPE_SIGNED_P(~A), ~:[sizeof(~A)~;~D~]);~%"
size-designator
(etypecase size-designator
(string nil)
(integer t))
size-designator)
(c-format out ")~%")
(unless (keywordp lisp-name)
(c-export out lisp-name))
(let ((size-of-constant-name (symbolicate '#:size-of- lisp-name)))
(c-export out size-of-constant-name)
(c-format out "(cl:defconstant "
size-of-constant-name lisp-name)
(c-print-symbol out size-of-constant-name)
(c-format out " (cffi:foreign-type-size '")
(c-print-symbol out lisp-name)
(c-format out "))~%")))
;;; Syntax differs from anything else in CFFI. Fix?
(define-grovel-syntax constant ((lisp-name &rest c-names)
&key (type 'integer) documentation optional)
(when (keywordp lisp-name)
(setf lisp-name (format-symbol "~A" lisp-name)))
(c-section-header out "constant" lisp-name)
(dolist (c-name c-names)
(format out "~&#ifdef ~A~%" c-name)
(c-export out lisp-name)
(c-format out "(cl:defconstant ")
(c-print-symbol out lisp-name t)
(c-format out " ")
(format out "~& if(_64_BIT_VALUE_FITS_SIGNED_P(~A))~%" c-name)
(format out " fprintf(output, \"%lli\", (int64_t) ~A);" c-name)
(format out "~& else~%")
(format out " fprintf(output, \"%llu\", (uint64_t) ~A);" c-name))
(double-float
(format out "~& fprintf(output, \"%s\", print_double_for_lisp((double)~A));~%" c-name)))
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(when documentation
(c-format out " ~S" documentation))
(c-format out ")~%")
(format out "~&#else~%"))
(unless optional
(c-format out "(cl:warn 'cffi-grovel:missing-definition :name '~A)~%"
lisp-name))
(dotimes (i (length c-names))
(format out "~&#endif~%")))
(define-grovel-syntax cunion (union-lisp-name union-c-name &rest slots)
(let ((documentation (when (stringp (car slots)) (pop slots))))
(c-section-header out "cunion" union-lisp-name)
(c-export out union-lisp-name)
(dolist (slot slots)
(let ((slot-lisp-name (car slot)))
(c-export out slot-lisp-name)))
(c-format out "(cffi:defcunion (")
(c-print-symbol out union-lisp-name t)
(c-printf out " :size %i)" (format nil "sizeof(~A)" union-c-name))
(when documentation
(c-format out "~% ~S" documentation))
(dolist (slot slots)
(destructuring-bind (slot-lisp-name slot-c-name &key type count)
slot
(declare (ignore slot-c-name))
(c-format out "~% (")
(c-print-symbol out slot-lisp-name t)
(c-format out " ")
(etypecase count
(integer
(c-format out " :count ~D" count))
((eql :auto)
;; nb, works like :count :auto does in cstruct below
(c-printf out " :count %i"
(format nil "sizeof(~A)" union-c-name)))
(null t))
(c-format out ")")))
(c-format out ")~%")))
(defun make-from-pointer-function-name (type-name)
(symbolicate '#:make- type-name '#:-from-pointer))
;;; DEFINE-C-STRUCT-WRAPPER (in ../src/types.lisp) seems like a much
;;; cleaner way to do this. Unless I can find any advantage in doing
;;; it this way I'll delete this soon. --luis
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(define-grovel-syntax cstruct-and-class-item (&rest arguments)
(process-grovel-form out (cons 'cstruct arguments))
(destructuring-bind (struct-lisp-name struct-c-name &rest slots)
arguments
(declare (ignore struct-c-name))
(let* ((slot-names (mapcar #'car slots))
(reader-names (mapcar
(lambda (slot-name)
(intern
(strcat (symbol-name struct-lisp-name) "-"
(symbol-name slot-name))))
slot-names))
(initarg-names (mapcar
(lambda (slot-name)
(intern (symbol-name slot-name) "KEYWORD"))
slot-names))
(slot-decoders (mapcar (lambda (slot)
(destructuring-bind
(lisp-name c-name
&key type count
&allow-other-keys)
slot
(declare (ignore lisp-name c-name))
(cond ((and (eq type :char) count)
'cffi:foreign-string-to-lisp)
(t nil))))
slots))
(defclass-form
`(defclass ,struct-lisp-name ()
,(mapcar (lambda (slot-name initarg-name reader-name)
`(,slot-name :initarg ,initarg-name
:reader ,reader-name))
slot-names
initarg-names
reader-names)))
(make-function-name
(make-from-pointer-function-name struct-lisp-name))
(make-defun-form
;; this function is then used as a constructor for this class.
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`(defun ,make-function-name (pointer)
(cffi:with-foreign-slots
(,slot-names pointer ,struct-lisp-name)
(make-instance ',struct-lisp-name
,@(loop for slot-name in slot-names
for initarg-name in initarg-names
for slot-decoder in slot-decoders
collect initarg-name
if slot-decoder
collect `(,slot-decoder ,slot-name)
else collect slot-name))))))
(c-export out make-function-name)
(dolist (reader-name reader-names)
(c-export out reader-name))
(c-write out defclass-form)
(c-write out make-defun-form))))
(define-grovel-syntax cstruct (struct-lisp-name struct-c-name &rest slots)
(let ((documentation (when (stringp (car slots)) (pop slots))))
(c-section-header out "cstruct" struct-lisp-name)
(c-export out struct-lisp-name)
(dolist (slot slots)
(let ((slot-lisp-name (car slot)))
(c-export out slot-lisp-name)))
(c-format out "(cffi:defcstruct (")
(c-print-symbol out struct-lisp-name t)
(c-printf out " :size %i)"
(format nil "sizeof(~A)" struct-c-name))
(when documentation
(c-format out "~% ~S" documentation))
(dolist (slot slots)
(destructuring-bind (slot-lisp-name slot-c-name &key type count)
slot
(c-format out "~% (")
(c-print-symbol out slot-lisp-name t)
(c-format out " ")
(etypecase type
((eql :auto)
(format out "~& SLOT_SIGNED_P(autotype_tmp, ~A, ~A~@[[0]~]);~@*~%~
~& type_name(output, autotype_tmp, sizeofslot(~A, ~A~@[[0]~]));~%"
struct-c-name
slot-c-name
(not (null count))))
((or cons symbol)
(c-write out type))
(string
(c-format out "~A" type)))
(integer
(c-format out " :count ~D" count))
((eql :auto)
(c-printf out " :count %i"
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(format nil "countofslot(~A, ~A)"
struct-c-name
slot-c-name)))
((or symbol string)
(format out "~&#ifdef ~A~%" count)
(c-printf out " :count %i"
(format nil "~A" count))
(format out "~&#endif~%")))
(format nil "offsetof(~A, ~A)"
struct-c-name
slot-c-name))))
(c-format out ")~%")
(let ((size-of-constant-name
(symbolicate '#:size-of- struct-lisp-name)))
(c-export out size-of-constant-name)
(c-format out "(cl:defconstant "
size-of-constant-name struct-lisp-name)
(c-print-symbol out size-of-constant-name)
(c-format out " (cffi:foreign-type-size '(:struct ")
(defmacro define-pseudo-cvar (str name type &key read-only)
(let ((c-parse (let ((*read-eval* nil)
(*readtable* (copy-readtable nil)))
(setf (readtable-case *readtable*) :preserve)
(read-from-string str))))
(typecase c-parse
(symbol `(cffi:defcvar (,(symbol-name c-parse) ,name
:read-only ,read-only)
,type))
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(list (unless (and (= (length c-parse) 2)
(null (second c-parse))
(symbolp (first c-parse))
(eql #\* (char (symbol-name (first c-parse)) 0)))
(error "Unable to parse c-string ~s." str))
(let ((func-name (symbolicate "%" name '#:-accessor)))
`(progn
(declaim (inline ,func-name))
(cffi:defcfun (,(string-trim "*" (symbol-name (first c-parse)))
,func-name) :pointer)
(define-symbol-macro ,name
(cffi:mem-ref (,func-name) ',type)))))
(t (error "Unable to parse c-string ~s." str)))))
(defun foreign-name-to-symbol (s)
(intern (substitute #\- #\_ (string-upcase s))))
(defun choose-lisp-and-foreign-names (string-or-list)
(etypecase string-or-list
(string (values string-or-list (foreign-name-to-symbol string-or-list)))
(list (destructuring-bind (fname lname &rest args) string-or-list
(declare (ignore args))
(assert (and (stringp fname) (symbolp lname)))
(values fname lname)))))
(define-grovel-syntax cvar (name type &key read-only)
(multiple-value-bind (c-name lisp-name)
(choose-lisp-and-foreign-names name)
(c-section-header out "cvar" lisp-name)
(c-export out lisp-name)
(c-printf out "(cffi-grovel::define-pseudo-cvar \"%s\" "
(format nil "indirect_stringify(~A)" c-name))
(c-print-symbol out lisp-name t)
(c-format out " ")
(when read-only
(c-format out " :read-only t"))
(c-format out ")~%")))
;;; FIXME: where would docs on enum elements go?
(define-grovel-syntax cenum (name &rest enum-list)
(destructuring-bind (name &key base-type define-constants)
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(ensure-list name)
(c-section-header out "cenum" name)
(c-export out name)
(c-format out "(cffi:defcenum (")
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(c-print-symbol out name t)
(when base-type
(c-printf out " ")
(c-print-symbol out base-type t))
(c-format out ")")
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(dolist (enum enum-list)
(destructuring-bind ((lisp-name &rest c-names) &key documentation)
enum
(declare (ignore documentation))
(check-type lisp-name keyword)
(loop :for c-name :in c-names :do
(check-type c-name string)
(c-format out " (")
(c-print-symbol out lisp-name)
(c-format out " ")
(c-printf out "%i" c-name)
(c-format out ")~%"))))
(c-format out ")~%")
(when define-constants
(define-constants-from-enum out enum-list))))
(define-grovel-syntax constantenum (name &rest enum-list)
(destructuring-bind (name &key base-type define-constants)
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(ensure-list name)
(c-section-header out "constantenum" name)
(c-export out name)
(c-format out "(cffi:defcenum (")
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(c-print-symbol out name t)
(when base-type
(c-printf out " ")
(c-print-symbol out base-type t))
(c-format out ")")
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(dolist (enum enum-list)
(destructuring-bind ((lisp-name &rest c-names)
&key optional documentation) enum
(declare (ignore documentation))
(check-type lisp-name keyword)
(c-format out "~% (")
(c-print-symbol out lisp-name)
(loop for c-name in c-names do
(check-type c-name string)
(format out "~&#ifdef ~A~%" c-name)
(c-format out " ")
(c-printf out "%i" c-name)
(format out "~&#else~%"))
(unless optional
(c-format out
"~% #.(cl:progn ~
(cl:warn 'cffi-grovel:missing-definition :name '~A) ~
-1)"
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lisp-name))
(dotimes (i (length c-names))
(format out "~&#endif~%"))
(c-format out ")")))
(c-format out ")~%")
(when define-constants
(define-constants-from-enum out enum-list))))
(defun define-constants-from-enum (out enum-list)
(dolist (enum enum-list)
(destructuring-bind ((lisp-name &rest c-names) &rest options)
enum
(%process-grovel-form
'constant out
`((,(intern (string lisp-name)) ,(car c-names))
,@options)))))
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(defun foreign-type-to-printf-specification (type)
"Return the printf specification associated with the foreign type TYPE."
(ecase type
(:char
"\"%hhd\"")
((:unsigned-char :uchar)
"\"%hhu\"")
(:short
"\"%hd\"")
((:unsigned-short :ushort)
"\"%hu\"")
(:int
"\"%d\"")
((:unsigned-int :uint)
"\"%u\"")
(:long
"\"%ld\"")
((:unsigned-long :ulong)
"\"%lu\"")
((:long-long :llong)
"\"%lld\"")
((:unsigned-long-long :ullong)
"\"%llu\"")
(:int8
"\"%\"PRId8")
(:uint8
"\"%\"PRIu8")
(:int16
"\"%\"PRId16")
(:uint16
"\"%\"PRIu16")
(:int32
"\"%\"PRId32")
(:uint32
"\"%\"PRIu32")
(:int64
"\"%\"PRId64")
(:uint64
"\"%\"PRIu64")))
;; Defines a bitfield, with elements specified as ((LISP-NAME C-NAME)
;; &key DOCUMENTATION). NAME-AND-OPTS can be either a symbol as name,
;; or a list (NAME &key BASE-TYPE).
(define-grovel-syntax bitfield (name-and-opts &rest masks)
(destructuring-bind (name &key base-type)
(ensure-list name-and-opts)
(c-section-header out "bitfield" name)
(c-export out name)
(c-format out "(cffi:defbitfield (")
(c-print-symbol out name t)
(when base-type
(c-printf out " ")
(c-print-symbol out base-type t))
(c-format out ")")
(dolist (mask masks)
(destructuring-bind ((lisp-name c-name) &key documentation) mask
(declare (ignore documentation))
(check-type lisp-name symbol)
(check-type c-name string)
(c-format out "~% (")
(c-print-symbol out lisp-name)
(c-format out " ")
(format out "~& fprintf(output, ~A, ~A);~%"
(foreign-type-to-printf-specification (or base-type :int))
c-name)
(c-format out ")")))
(c-format out ")~%")))
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;;;# Wrapper Generation
;;;
;;; Here we generate a C file from a s-exp specification but instead
;;; of compiling and running it, we compile it as a shared library
;;; that can be subsequently loaded with LOAD-FOREIGN-LIBRARY.
;;;
;;; Useful to get at macro functionality, errno, system calls,
;;; functions that handle structures by value, etc...
;;;
;;; Matching CFFI bindings are generated along with said C file.
(defun process-wrapper-form (out form)
(%process-wrapper-form (form-kind form) out (cdr form)))
;;; The various operators push Lisp forms onto this list which will be
;;; written out by PROCESS-WRAPPER-FILE once everything is processed.
(defvar *lisp-forms*)
(defun generate-c-lib-file (input-file output-defaults)
(let ((*lisp-forms* nil)
(c-file (make-pathname :type "c" :defaults output-defaults)))
(with-open-file (out c-file :direction :output :if-exists :supersede)
(with-open-file (in input-file :direction :input)
(write-string *header* out)
(loop for form = (read in nil nil) while form
do (process-wrapper-form out form))))
(values c-file (nreverse *lisp-forms*))))
(defun lib-filename (defaults)
(make-pathname :type (subseq (cffi::default-library-suffix) 1)
:defaults defaults))
(defun generate-bindings-file (lib-file lib-soname lisp-forms output-defaults)
(let ((lisp-file (tmp-lisp-filename output-defaults)))
(with-open-file (out lisp-file :direction :output :if-exists :supersede)
(format out ";;;; This file was automatically generated by cffi-grovel.~%~
;;;; Do not edit by hand.~%")
(let ((*package* (find-package '#:cl))
(named-library-name
(let ((*package* (find-package :keyword))
(*read-eval* nil))
(read-from-string lib-soname))))
(pprint `(progn
(cffi:define-foreign-library
(,named-library-name
:type :grovel-wrapper
:search-path ,(directory-namestring lib-file))
(t ,(namestring (lib-filename lib-soname))))
(cffi:use-foreign-library ,named-library-name))
out)
(fresh-line out))
(dolist (form lisp-forms)
(print form out))
(terpri out))
lisp-file))
;;; *PACKAGE* is rebound so that the IN-PACKAGE form can set it during
;;; *the extent of a given wrapper file.
(defun process-wrapper-file (input-file output-defaults lib-soname)
(with-standard-io-syntax
(let ((lib-file
(lib-filename (make-pathname :name lib-soname
:defaults output-defaults))))
(multiple-value-bind (c-file lisp-forms)
(generate-c-lib-file input-file output-defaults)
(cc-compile-and-link c-file lib-file :library t)
;; FIXME: hardcoded library path.
(values (generate-bindings-file lib-file lib-soname lisp-forms output-defaults)
lib-file)))))
(defgeneric %process-wrapper-form (name out arguments)
(:method (name out arguments)
(declare (ignore out arguments))
(error "Unknown Grovel syntax: ~S" name)))
;;; OUT is lexically bound to the output stream within BODY.
(defmacro define-wrapper-syntax (name lambda-list &body body)
(with-unique-names (name-var args)
`(defmethod %process-wrapper-form ((,name-var (eql ',name)) out ,args)
(declare (ignorable out))
(destructuring-bind ,lambda-list ,args
,@body))))
(define-wrapper-syntax progn (&rest forms)
(dolist (form forms)
(process-wrapper-form out form)))
(define-wrapper-syntax in-package (name)
(setq *package* (find-package name))
(push `(in-package ,name) *lisp-forms*))
(define-wrapper-syntax c (&rest strings)
(dolist (string strings)
(write-line string out)))
(define-wrapper-syntax flag (&rest flags)
(appendf *cc-flags* (trim-whitespace flags)))
(define-wrapper-syntax proclaim (&rest proclamations)
(push `(proclaim ,@proclamations) *lisp-forms*))
(define-wrapper-syntax declaim (&rest declamations)
(push `(declaim ,@declamations) *lisp-forms*))
(define-wrapper-syntax define (name &optional value)
(format out "#define ~A~@[ ~A~]~%" name value))
(define-wrapper-syntax include (&rest includes)
(format out "~{#include <~A>~%~}" includes))
;;; FIXME: this function is not complete. Should probably follow
;;; typedefs? Should definitely understand pointer types.
(defun c-type-name (typespec)
(let ((spec (ensure-list typespec)))
(if (stringp (car spec))
(car spec)
(case (car spec)
((:uchar :unsigned-char) "unsigned char")
((:unsigned-short :ushort) "unsigned short")
((:unsigned-int :uint) "unsigned int")
((:unsigned-long :ulong) "unsigned long")
((:long-long :llong) "long long")
((:unsigned-long-long :ullong) "unsigned long long")
(:pointer "void*")
(:string "char*")
(t (cffi::foreign-name (car spec) nil))))))
(defun cffi-type (typespec)
(if (and (listp typespec) (stringp (car typespec)))
(second typespec)
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(defun symbol* (s)
(check-type s (and symbol (not null)))
s)
(define-wrapper-syntax defwrapper (name-and-options rettype &rest args)
(multiple-value-bind (lisp-name foreign-name options)
(cffi::parse-name-and-options name-and-options)
(let* ((foreign-name-wrap (strcat foreign-name "_cffi_wrap"))
(fargs (mapcar (lambda (arg)
(list (c-type-name (second arg))
(cffi::foreign-name (first arg) nil)))
args))
(fargnames (mapcar #'second fargs)))
;; output C code
(format out "~A ~A" (c-type-name rettype) foreign-name-wrap)
(format out "(~{~{~A ~A~}~^, ~})~%" fargs)
(format out "{~% return ~A(~{~A~^, ~});~%}~%~%" foreign-name fargnames)
;; matching bindings
(push `(cffi:defcfun (,foreign-name-wrap ,lisp-name ,@options)
,(cffi-type rettype)
,@(mapcar (lambda (arg)
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(list (symbol* (first arg))
(cffi-type (second arg))))
args))
*lisp-forms*))))
(define-wrapper-syntax defwrapper* (name-and-options rettype args &rest c-lines)
;; output C code
(multiple-value-bind (lisp-name foreign-name options)
(cffi::parse-name-and-options name-and-options)
(let ((foreign-name-wrap (strcat foreign-name "_cffi_wrap"))
(fargs (mapcar (lambda (arg)
(list (c-type-name (second arg))
(cffi::foreign-name (first arg) nil)))
args)))
(format out "~A ~A" (c-type-name rettype)
foreign-name-wrap)
(format out "(~{~{~A ~A~}~^, ~})~%" fargs)
(format out "{~%~{ ~A~%~}}~%~%" c-lines)
;; matching bindings
(push `(cffi:defcfun (,foreign-name-wrap ,lisp-name ,@options)
,(cffi-type rettype)
,@(mapcar (lambda (arg)
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(list (symbol* (first arg))
(cffi-type (second arg))))
args))
*lisp-forms*))))