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;;;; easyffi.scm
;
; Copyright (c) 2000-2004, Felix L. Winkelmann
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
; conditions are met:
;
; Redistributions of source code must retain the above copyright notice, this list of conditions and the following
; disclaimer.
; Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
; disclaimer in the documentation and/or other materials provided with the distribution.
; Neither the name of the author nor the names of its contributors may be used to endorse or promote
; products derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
; AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
; POSSIBILITY OF SUCH DAMAGE.
;
; Send bugs, suggestions and ideas to:
;
; felix@call-with-current-continuation.org
;
; Felix L. Winkelmann
; Unter den Gleichen 1
; 37130 Gleichen
; Germany
#{compiler debugging-chicken used-units register-ffi-macro parse-easy-ffi ffi-include-path-list foreign-type-declaration
foreign-declarations explicit-use-flag check-c-syntax no-c-syntax-checks}
(declare
(unit easyffi)
(compress-literals)
(no-bound-checks)
(no-procedure-checks)
(export parse-easy-ffi register-ffi-macro used-units foreign-declarations number-type ffi-include-path-list
foreign-type-declaration explicit-use-flag debugging-chicken check-c-syntax no-c-syntax-checks) )
(eval-when (compile) (match-error-control #:unspecified))
(include "easyffi.l.silex")
(define use-finalizers #f)
(define exception-handler #f)
(define destructor-name 'destroy)
(define pp-mode #f)
(define processed-output '())
(define macro-table '((|CHICKEN| * ())))
(define pp-conditional-stack '())
(define pp-process #t)
(define type-map '())
(define ffi-include-path-list '("."))
(define export-constants #f)
(define prefix #f)
(define name-substitution-rxs '())
(define name-substitution-repls '())
(define declared-types '())
(define rename-list '())
(define abstract-classes '())
(define full-specialization #f)
(define defined-enums '())
(define parsing-error quit)
(define (pp-token tok)
(if pp-mode
tok
(quit "FFI lexer error: preprocessor-command out of context: ~S" tok) ) )
(define (pp-token2 tok tok2)
(if pp-mode tok tok2) )
(define (lexer-error)
(parsing-error "FFI lexer error: illegal character") )
(define (chunkify)
(let rec ([scope 0])
(let ([chunks '()])
(let loop ([mode #f] [tokens '()])
(let ([t (lexer)])
(case t
[(stop) (reverse chunks)]
[(pp-end)
(set! chunks (cons (reverse tokens) chunks))
(loop #f '()) ]
[(pp-define pp-include pp-if pp-ifdef pp-ifndef pp-else pp-endif pp-undef pp-pragma pp-error)
(loop 'pp (list t)) ]
[(close-curly)
(cond [(not (positive? scope)) (parsing-error "`}' out of context")]
[(null? tokens) (reverse chunks)]
[else (cons (reverse tokens) chunks)] ) ]
[(open-curly)
(let ([new (rec (add1 scope))])
(set! chunks (cons (append-reverse tokens `((scope . ,new))) chunks))
(loop #f '()) ) ]
[(close-paren)
(if (eq? mode 'declare)
(begin
(set! chunks (cons (reverse (cons 'close-paren tokens)) chunks))
(loop #f '()) )
(loop mode (cons t tokens)) ) ]
[(declare)
(loop 'declare '(declare)) ]
[(semicolon)
(if mode
(parsing-error "unexpected semicolon")
(begin
(set! chunks (cons (reverse tokens) chunks))
(loop #f '()) ) ) ]
[else (loop mode (cons t tokens))] ) ) ) ) ) )
(define (parse c)
(match c
[() #f]
[('pp-else)
(when (null? pp-conditional-stack)
(parsing-error "unbalanced preprocessor conditionals") )
(set! pp-process (and (not (car pp-conditional-stack)) (every identity (cdr pp-conditional-stack)))) ]
[('pp-endif)
(when (null? pp-conditional-stack)
(parsing-error "unbalanced preprocessor conditionals") )
(set! pp-conditional-stack (cdr pp-conditional-stack))
(set! pp-process (every identity pp-conditional-stack)) ]
[('pp-ifdef ('id name))
(set! pp-process (and pp-process (assq (string->symbol name) macro-table)))
(set! pp-conditional-stack (cons pp-process pp-conditional-stack)) ]
[('pp-ifndef ('id name))
(set! pp-process (and pp-process (not (assq (string->symbol name) macro-table))))
(set! pp-conditional-stack (cons pp-process pp-conditional-stack)) ]
[('pp-if . _)
(warning "preprocessor conditional `~A' ignored (assuming false)" c)
(set! pp-process #f)
(set! pp-conditional-stack (cons #f pp-conditional-stack)) ]
[_ (when pp-process
(match c
[('pp-define ('id name))
(let ([s (string->symbol name)])
(set! macro-table (cons (list s '* '()) macro-table)) ) ]
[('pp-define ('id name) ('num n))
(let ([s (string->symbol name)])
(set! macro-table (cons (list s (if (exact? n) 'int 'double) `((num ,n))) macro-table))
(process-constant-def s n) ) ]
[('pp-define ('id name) . more)
(let ([t (compute-macro-type more)]
[s (string->symbol name)] )
(set! macro-table (cons (list s t more) macro-table))
(process-macro-def s t) ) ]
[('pp-undef ('id name))
(set! macro-table (delete (assq (string->symbol name) macro-table) eq?)) ]
[('pp-error msgs ...)
(parsing-error (string-intersperse (cons "(#error) " (map reparse-item msgs)) "")) ]
[('pp-include ((or 'string 'i-string) filename))
(let ([fname (resolve-ffi-include-file filename)])
(if fname
(call-with-input-file fname parse-easy-ffi-rec)
(parsing-error "can not open include file `~A'" filename) ) ) ]
[('pp-pragma . more) #f]
[('declare 'open-paren ('id decl) 'comma val 'close-paren)
(parse-declaration decl val) ]
[('declare . _)
(parsing-error "invalid syntax in pseudo declaration: ~S" c) ]
[_ (let ([cb #f]
[ab #f]
[sp #f]
[dc #f]
[ds #f] )
(let loop ([c (subst-macros c)])
(match c
[((or 'extern 'static 'volatile 'inline) . more)
(loop more) ]
[('abstract . more)
(set! ab #t)
(loop more) ]
[('specialize . more)
(set! sp #t)
(loop more) ]
[('callback . more)
(set! cb #t)
(loop more) ]
[('discard . more)
(set! ds #t)
(loop more) ]
[('const . more)
(if (memq 'open-paren more)
(parse-prototype c cb sp dc ds)
(begin
(set! dc #t)
(loop more) ) ) ]
[('enum ('scope more))
(parse-enum-def #f (subst-macros more)) ]
[('enum ('id name) ('scope more))
(parse-enum-def name (subst-macros more)) ]
[('class . more)
(parse-class-def more ab) ]
[('struct ('id name)) #f]
[('using . more) #f]
[('typedef . more)
(parse-typedef more) ]
[(and more (('id name) . _))
(parse-prototype more cb sp dc ds) ]
[more
(parse-prototype more cb sp dc ds)] ) ) ) ] ) ) ] ) )
(define parse-again parse)
(define parse-type-rec
(match-lambda
[('const . more)
(let-values ([(t0 more) (parse-type-rec more)])
(values `(const ,t0) more) ) ]
[('unsigned t 'star . more)
(let-values ([(t0 more) (parse-type-rec (cons* 'unsigned t more))])
(values `(pointer ,t0) more) ) ]
[('signed t 'star . more)
(let-values ([(t0 more) (parse-type-rec (cons* 'signed t more))])
(values `(pointer ,t0) more) ) ]
[(t ('op "<") . more)
(let*-values ([(ts more) (parse-typelist more)]
[(t0 _) (parse-type-rec (list t))] )
(values `(template ,t0 ,@ts) more) ) ]
[('signed . more) (parse-type-rec more)]
[`(unsigned fixnum . ,more) (values 'unsigned-int more)]
[`(unsigned int . ,more) (values (if (eq? number-type 'fixnum) 'unsigned-int 'unsigned-integer) more)]
[`(unsigned char . ,more) (values 'unsigned-char more)]
[`(unsigned short . ,more) (values 'unsigned-short more)]
[`(unsigned long . ,more) (values 'unsigned-long more)]
[`(void . ,more) (values 'void more)]
[`(bool . ,more) (values 'bool more)]
[`(unsigned byte . ,more) (values 'unsigned-byte more)]
[`(byte . ,more) (values 'byte more)]
[`(scheme-value . ,more) (values 'scheme-object more)]
[`(fixnum . ,more) (values 'int more)]
[`(int . ,more) (values (if (eq? number-type 'fixnum) 'int 'integer) more)]
[`(char . ,more) (values 'char more)]
[`(short . ,more) (values 'short more)]
[`(long . ,more) (values 'long more)]
[`(float . ,more) (values 'float more)]
[`(double . ,more) (values 'double more)]
[('struct ('id sname) . more) (values `(struct ,sname) more)]
[('union ('id sname) . more) (values `(union ,sname) more)]
[('enum ('id sname) . more) (values `(enum ,sname) more)]
[(('id t) . more)
(let ([st (string->symbol t)])
(cond [(assq st type-map) => (lambda (a) (values (cdr a) more))]
[(memq st defined-enums) (values `(enum ,t) more)]
[(memq st declared-types) (values st more)]
[else (values t more)] ) ) ]
[x (parsing-error "invalid type specifier: ~S" x)] ) )
(define (parse-type ts #!optional return-type discard)
(let-values ([(t0 more) (parse-type-rec ts)])
(let loop ([t0 t0] [more more])
(match more
[('star . more)
(loop `(pointer ,t0) more) ]
[(('op "&") . more)
(loop `(ref ,t0) more) ]
[('open-paren 'star . (or (('id _) 'close-paren 'open-paren . more) ('close-paren 'open-paren . more)))
(let-values ([(ts more) (parse-arglist more)])
(values `(function ,t0 ,ts) more) ) ]
[_ (values (simplify-type t0 return-type discard) more)] ) ) ) )
(define (simplify-type t0 return-type discard)
(define (strtype) (if discard 'c-string* 'c-string))
(if return-type
(match t0
['(pointer char) (strtype)]
['(pointer (const char)) (strtype)]
[`(pointer ,(? string? t))
(let ([st (string->symbol t)])
(if (memq st defined-classes)
`(instance ,t ,(fix-cname t))
t0) ) ]
[_ t0] )
(let loop ([t1 t0])
(match t1
[`(pointer (const ,t2)) (loop `(pointer ,t2))]
['(pointer unsigned-fixnum) 'u32vector]
['(pointer unsigned-integer) 'u32vector]
['(pointer unsigned-short) 'u16vector]
['(pointer unsigned-char) 'u8vector]
['(pointer unsigned-byte) 'u8vector]
['(pointer byte) 's8vector]
['(pointer unsigned-long) 'u32vector]
['(pointer fixnum) 's32vector]
['(pointer integer) 's32vector]
['(pointer int) 's32vector]
['(pointer short) 's16vector]
['(pointer char) (strtype)]
['(pointer long) 's32vector]
['(pointer float) 'f32vector]
['(pointer double) 'f64vector]
[`(pointer ,(? string? t))
(let ([st (string->symbol t)])
(if (memq st defined-classes)
`(instance ,t ,(fix-cname t))
t1) ) ]
[_ t1] ) ) ) )
(define (parse-arglist ts)
(let rec ([more ts] [args '()])
(match more
[('close-paren . more)
(values (reverse args) more) ]
[('dots . _)
(parsing-error "varargs are not supported") ]
[_ (let-values ([(type more) (parse-type more #f)])
(match more
[(('id str) 'comma . more)
(rec more (cons type args)) ]
[(('id str) 'close-paren . more)
(values (reverse (cons type args)) more) ]
[('comma . more)
(rec more (cons type args)) ]
[('close-paren . more)
(values (reverse (cons type args)) more) ]
[_ (parsing-error "bad argument list syntax: ~S" more)] ) ) ] ) ) )
(define (parse-typelist ts)
(let rec ([more ts] [ts '()])
(match more
[(('op ">") . more)
(values (reverse ts) more) ]
[_ (let-values ([(type more) (parse-type more #f)])
(match more
[('comma . more)
(rec more (cons type ts)) ]
[(('op ">") . more)
(values (reverse (cons type ts)) more) ]
[_ (parsing-error "bad template type list syntax: ~S" more)] ) ) ] ) ) )
(define (subst-macros chunk)
(let loop ([c chunk])
(match c
[() '()]
[((and x ('id name)) . more)
(let ([a (assq (string->symbol name) macro-table)])
(if a
(loop (append (third a) more))
(cons x (loop more)) ) ) ]
[(x . y) (cons x (loop y))] ) ) )
(define (parse-prototype ts cb sp const discard)
(fluid-let ([full-specialization (or sp full-specialization)])
(let-values ([(rtype more) (parse-type ts #t discard)])
(let loop ([more more])
(match more
[() #f]
[(('id str) ('op "::") . more) #f]
[(('id str) 'open-paren 'void 'close-paren . more)
(process-prototype-def rtype (string->symbol str) '() cb)
(match more
[(('scope . _) . more) (parse-again more)]
[() #f]
[_ (parsing-error "unexpected tokens: ~S" more)] ) ]
[(('id str) 'open-paren . more)
(let-values ([(args more) (parse-arglist more)])
(process-prototype-def rtype (string->symbol str) args cb)
(match more
[(('scope . _) . more) (parse-again more)]
[() #f]
[_ (parsing-error "unexpected tokens: ~S" more)] ) ) ]
[(('id str) 'comma . more)
(process-variable-def rtype (string->symbol str) const)
(loop more) ]
[(('id str))
(process-variable-def rtype (string->symbol str) const) ]
[(('id str) . (or (('op "=") . _) ()))
(process-variable-def rtype (string->symbol str) const) ]
[else (parsing-error "bad prototype syntax `~A'" more)] ) ) ) ) )
(define (parse-enum-def ename ts)
(when ename (set! defined-enums (cons (string->symbol ename) defined-enums)))
(let loop ([ts ts] [i 0] [items '()])
(match ts
[('close-curly) #f]
[_ (let-values ([(sym val more) (parse-enum-item ts i)])
(let ([items (alist-cons sym val items)]
[i (add1 val)] )
(match more
[() (process-enum-def ename items)]
[('comma . more) (loop more i items)]
[_ (parsing-error "syntax error in enum form `~A'" more)] ) ) ) ] ) ) )
(define (parse-enum-item ts i)
(match ts
[(('id name) ('op "=") ('num n) . more)
(if (integer? n)
(values (string->symbol name) n more)
(error "non-exact enum value for `~A'" name) ) ]
[(('id name) . more)
(values (string->symbol name) i more) ]
[_ (parsing-error "invalid enum syntax `~A'" ts)] ) )
(define (parse-typedef ts)
(let-values ([(type more) (parse-type ts #t)])
(let loop ([more more] [type type])
(match more
[('star . more)
(loop more `(pointer ,type)) ]
[(('id tname))
(set! type-map (alist-cons (string->symbol tname) (simplify-type type #t #f) type-map)) ]
[_ (parsing-error "invalid typedef syntax `~A'" more)] ) ) ) )
(define has-constructor #f)
(define defined-classes '())
(define (parse-class-def ts ab)
(match ts
[(('id name))
(set! defined-classes (cons (string->symbol name) defined-classes)) ]
[(('id name) . more)
(let ([sym (string->symbol name)])
(set! defined-classes (cons sym defined-classes))
(when ab (set! abstract-classes (cons sym abstract-classes))) )
(let loop ([more more] [t '(op ":")] [bases '()])
(if (and (pair? more) (equal? t (car more)))
(match more
[(_ (or 'public 'protected 'private) ('id bname) . more)
(loop more 'comma
(if (memq (string->symbol bname) defined-classes)
(cons bname bases)
bases) ) ]
[(_ ('id bname) . more)
(loop more 'comma
(if (memq (string->symbol bname) defined-classes)
(cons bname bases)
bases) ) ]
[_ (parsing-error "invalid class definition for `~A': ~S" name more)] )
(match more
[(('scope . chunks))
(let ([cname (fix-cname name)]
[csname (string->symbol name)] )
(process-class-def name cname bases)
(fluid-let ([has-constructor #f])
(let ([exp #f])
(for-each
(lambda (chunk)
(let loop ([more (subst-macros chunk)])
(match more
[() #f]
[('public ('op ":") . more)
(set! exp #t)
(loop more) ]
[((or 'private 'protected) ('op ":") . more)
(set! exp #f)
(loop more) ]
[more
(when exp
(fluid-let ([parse-again loop])
(parse-member-prototype name cname more #f #f) ) ) ] ) ) )
chunks)
(when (and (not has-constructor) (not (memq csname abstract-classes)))
(process-constructor-def name cname '()) ) ) ) ) ]
[_ (parsing-error "invalid class definition for `~A': ~S" name more)] ) ) ) ]
[_ (parsing-error "invalid class definition: ~S" ts)] ) )
(define (parse-member-prototype name cname ts cb discard)
(match ts
[('specialize . more)
(fluid-let ([full-specialization #t])
(parse-member-prototype name cname more #t discard) ) ]
[('callback . more)
(parse-member-prototype name cname more #t discard) ]
[('discard . more)
(parse-member-prototype name cname more cb #t) ]
[((or 'explicit 'virtual) . more)
(parse-member-prototype name cname more cb discard) ]
[(('id name2) 'open-paren 'void 'close-paren . more)
(if (string=? name2 name)
(begin
(process-constructor-def name cname '())
(set! has-constructor #t)
(match more
[(('scope . _) . more) (parse-again more)]
[() #f]
[_ (parsing-error "unexpected tokens: ~S" more)] ) )
(parsing-error "invalid constructor for `~A': ~S" name ts) ) ]
[(('id name2) 'open-paren . more)
(if (string=? name2 name)
(let-values ([(args more) (parse-arglist more)])
(process-constructor-def name cname args)
(set! has-constructor #t)
(match more
[(('scope . _) . more) (parse-again more)]
[() #f]
[_ (parsing-error "unexpected tokens: ~S" more)] ) )
(parsing-error "invalid constructor for `~A': ~S" name ts) ) ]
[(('op "~") ('id name2) 'open-paren . (or ('void 'close-paren . more) ('close-paren . more)))
(if (string=? name2 name)
(match more
[(('scope . _) . more) (parse-again more)]
[() #f]
[_ (parsing-error "unexpected tokens: ~S" more)] )
(parsing-error "invalid destructor for `~A': ~S" name ts) ) ]
[('static . more)
(let-values ([(rtype more) (parse-type more #t)])
(match more
[(('id str) 'open-paren 'void 'close-paren . more)
(process-prototype-def rtype (string->symbol (string-append name "::" str)) '() cb)
(match more
[(('scope . _) . more) (parse-again more)]
[() #f]
[_ (parsing-error "unexpected tokens: ~S" more)] ) ]
[(('id str) 'open-paren . more)
(let-values ([(args more) (parse-arglist more)])
(process-prototype-def rtype (string->symbol (string-append name "::" str)) args cb)
(match more
[(('scope . _) . more) (parse-again more)]
[() #f]
[_ (parsing-error "unexpected tokens: ~S" more)] ) ) ]
[_ (parsing-error "bad static member prototype syntax: ~S" more)] ) ) ]
[_ (let-values ([(rtype more) (parse-type ts #t discard)])
(match more
[(('id str) 'open-paren 'void 'close-paren . more)
(process-member-prototype-def name cname rtype (string->symbol str) '() cb)
(parse-member-body more) ]
[(('id str) 'open-paren . more)
(let-values ([(args more) (parse-arglist more)])
(process-member-prototype-def name cname rtype (string->symbol str) args cb)
(parse-member-body more) ) ]
[(('id str) . (or (('op "=") . _) ()))
#f] ; member variables are ignored
[_ (parsing-error "bad member prototype syntax: ~S" more)] ) ) ] ) )
(define (parse-member-body ts)
(let loop ([more ts])
(match more
[('const . more) (loop more)]
[(('op "=") (num 0) . more)
(set! has-constructor #t)
(loop more) ]
[(('scope . _) . more) (parse-again more)]
[() #f]
[_ (parsing-error "unexpected tokens: ~S" more)] ) ) )
(define reparse-item
(match-lambda
['pp-define "#define"]
['pp-include "#include"]
['pp-undef "#undef"]
['pp-ifndef "#ifndef"]
['pp-ifdef "#ifdef"]
['pp-if "#if"]
['pp-pragma "#pragma"]
['pp-error "#error"]
['pp-else "#else"]
['pp-endif "#endif"]
[('id str) str]
[('num num) num]
[('op op) op]
['star "*"]
['open-paren "("]
['close-paren ")"]
['open-bracket "["]
['close-bracket "]"]
['open-curly "{"]
['close-curly "}"]
['fixnum "int"]
['comma ","]
[('string str) (string-append "\"" str "\"")]
[('i-string str) (string-append "<" str ">")]
['class "class"]
['protected "protected"]
['public "public"]
['private "private"]
[c c] ) )
(define (type-union t1 t2)
(cond [(eq? '_ t2) t1]
[(eq? t1 t2) t1]
[(eq? 'integer t1)
(case t2
[(double) 'double]
[else '*] ) ]
[(and (eq? 'double t1) (eq? 'integer t2)) 'double]
[else '*] ) )
(define (compute-macro-type ts)
(let rec ([ts ts])
(if (null? ts)
'_
(match (car ts)
[('num n) (type-union (if (exact? n) 'integer 'double) (rec (cdr ts)))]
[('id str)
(let ([a (assq (string->symbol str) macro-table)])
(if a
(type-union (second a) (rec (cdr ts)))
'*) ) ]
[_ (rec (cdr ts))] ) ) ) )
(define (emit . xs)
(when (memq '|F| debugging-chicken)
(for-each pretty-print xs) )
(set! processed-output (append-reverse xs processed-output)) )
(define (process-macro-def name type)
(if (memq type '(* _))
(warning "can not compute macro type `~A' (ignored)" name)
(let ([name2 (fix-name name)])
(emit `(define-foreign-variable ,name2 ,type ,(->string name)))
(when export-constants (emit `(define ,name2 ,name2))) ) ) )
(define (process-constant-def name val)
(let ([name (fix-name name)])
(emit `(define-constant ,name ,val))
(when export-constants (emit `(define ,name ,name))) ) )
(define (process-prototype-def rtype name args cb)
(let ([name2 (fix-name name)])
(emit
(if (and full-specialization (pair? args))
(let ([slist (gen-spec-list args)]
[tmp (gensym)] )
`(begin
(declare (hide ,tmp))
(define ,tmp
(,(if cb 'foreign-callback-lambda 'foreign-lambda)
,rtype ,(->string name) ,@args) )
(define-method (,name2 ,@slist)
(,tmp ,@(unzip1 slist) ) ) ) )
`(define ,name2
(,(if cb 'foreign-callback-lambda 'foreign-lambda)
,rtype ,(->string name) ,@args))) ) ) )
(define (process-variable-def rtype name const)
(let ([tmp (gensym)]
[var (gensym)]
[name2 (fix-name name)] )
(emit `(define-foreign-variable ,tmp ,rtype ,(->string name)))
(if const
(emit `(define ,name2 ,tmp))
(emit `(define (,name2 . ,var)
(if (pair? ,var)
(set! ,tmp (car ,var))
,tmp) ) ) ) ) )
(define (process-enum-def ename items)
(for-each
(match-lambda
[(name . val)
(let ([name (fix-name name)])
(emit `(define-constant ,name ,val))
(when export-constants (emit `(define ,name ,name))) ) ] )
(reverse items) ) )
(define (process-class-def name cname basenames)
(let ([destr (gensym)]
[name2 (fix-name name)]
[csname (string->symbol name)] )
(emit
`(declare (hide ,destr))
`(define-class ,cname
,(if (null? basenames)
`(<c++-object>)
(map (lambda (b) (fix-cname b)) (reverse basenames) ) )
() ) )
(unless (memq csname abstract-classes)
(emit
`(define ,destr (foreign-lambda void "delete " (pointer ,name)))
`(define-method (,destructor-name (this ,cname))
(,destr (slot-ref this 'this)) ) ) ) ) )
(define (process-constructor-def name cname args)
(let ([constr (gensym)])
(emit
`(declare (hide ,constr))
`(define ,constr (foreign-lambda (pointer ,name) ,(string-append "new " name) ,@args))
`(define-method (initialize (this ,cname) initargs)
;; no CALL-NEXT-METHOD here: we don't want to invoke the base-class constructor.
,@(if (and use-finalizers (not (memq (string->symbol name) abstract-classes)))
`((set-finalizer! this ,destructor-name))
'() )
(slot-set!
this 'this
(if (and (pair? initargs) (eq? 'this (##sys#slot initargs 0)))
(cadr initargs)
(apply ,constr initargs) ) ) ) ) ) )
(define (process-member-prototype-def name cname rtype mname args cb)
(let* ([stub (gensym)]
[this (gensym)]
[vars (map (lambda _ (gensym)) args)]
[fvars (map list args vars)] )
(emit
`(declare (hide ,stub))
`(define ,stub
(,(if cb 'foreign-callback-lambda* 'foreign-lambda*)
,rtype (((pointer ,name) ,this) ,@fvars)
,(sprintf (let ([code (if (eq? 'void rtype)
"~A->~A(~A);"
"return(~A->~A(~A));") ] )
(if exception-handler
(sprintf "try { ~A } ~A;" code exception-handler)
code) )
this mname
(string-intersperse (map ->string vars) ",")) ) )
(if (and full-specialization (pair? args))
(let ([slist (gen-spec-list args)])
`(define-method (,(fix-name mname) (this ,cname) ,@slist)
(,stub (slot-ref this 'this) ,@(unzip1 slist) ) ) )
`(define-method (,(fix-name mname) (this ,cname) . args)
(apply ,stub (slot-ref this 'this) args) ) ) ) ) )
(define parse-declaration
(match-lambda*
[("export_constants" ('id "yes"))
(set! export-constants #t) ]
[("export_constants" _)
(set! export-constants #f) ]
[("abstract" ('id cls))
(set! abstract-classes (cons (string->symbol cls) abstract-classes)) ]
[("class_finalizers" ('id "yes"))
(set! use-finalizers #t) ]
[("class_finalizers" _)
(set! use-finalizers #f) ]
[("destructor_name")
(set! destructor-name 'destroy) ]
[("destructor_name" ('string name))
(set! destructor-name (string->symbol name)) ]
[("exception_handler" ('string code))
(set! exception-handler code) ]
[("prefix" ('string str))
(set! prefix str) ]
[("prefix" ('id "no"))
(set! prefix #f) ]
[("scheme" ('string str))
(let ([exp (with-input-from-string str read)])
(emit exp) ) ]
[("type" ('string str))
(parse-type-declaration (string-split str ";")) ]
[("rename" ('string str))
(match (string-split str ";")
[(from to)
(set! rename-list (alist-cons (string->symbol from) (string->symbol to) rename-list)) ]
[_ (parsing-error "invalid rename declaration: ~S" str)] ) ]
[("substitute" ('string str))
(match (string-split str ";")
[(from to)
(set! name-substitution-rxs (append name-substitution-rxs (list from)))
(set! name-substitution-repls (append name-substitution-repls (list to))) ]
[_ (parsing-error "invalid name substitution string: ~S" str)] ) ]
[("transform" ('string str))
(match (string-split str ";")
[(from to)
(let ([tr (handle-exceptions ex (parsing-error "error in transformation expression: ~S" to)
(eval (safe-read-from-string to)) ) ] )
(unless (procedure? tr)
(parsing-error "transformation expression does not evaluate to procedure: ~S" to) )
(set! name-substitution-rxs (append name-substitution-rxs (list from)))
(set! name-substitution-repls (append name-substitution-repls (list tr))) ) ]
[_ (parsing-error "invalid transformation: ~S" str)] ) ]
[("full_specialization" ('id "yes"))
(set! full-specialization #t) ]
[("full_specialization" _)
(set! full-specialization #f) ]
[(decl _)
(parsing-error "invalid pseudo declaration: ~S" decl) ] ) )
(define (safe-read-from-string str)
(handle-exceptions ex (parsing-error "can not parse expression: ~S" str)
(with-input-from-string str read) ) )
(define (parse-type-declaration vals)
(let rec ([vals vals])
(match vals
[(tname stype arg ret)
(let ([stype (safe-read-from-string stype)]
[arg (and arg (safe-read-from-string arg))]
[ret (and ret (safe-read-from-string ret))]
[stname (string->symbol tname)] )
(set! foreign-declarations
(cons (sprintf "#define ~A ~A~%" tname (foreign-type-declaration stype "")) foreign-declarations))
(emit
`(define-foreign-type ,stname ,stype ,@(if arg (list arg) '()) ,@(if ret (list ret) '())) )
(set! declared-types (cons stname declared-types)) ) ]
[(tname stype arg) (rec (list tname stype arg #f))]
[(tname stype) (rec (list tname stype #f #f))]
[_ (parsing-error "invalid value-syntax in type declaration: ~S" vals)] ) ) )
(define (fix-name str)
(let ([a (assq (->symbol str) rename-list)])
(if a
(cdr a)
(let ([n1 (fold
(lambda (rx repl str)
(if (procedure? repl)
(let ([m (string-match rx str)])
(if m (repl m) str) )
(string-substitute rx repl str #t) ) )
(->string str)
name-substitution-rxs
name-substitution-repls) ] )
(string->symbol
(strdowncase
(if prefix
(string-append prefix n1)
n1) ) ) ) ) ) )
(define (fix-cname str)
(let ([a (assq (->symbol str) rename-list)])
(if a
(cdr a)
(string->symbol (string-append "<" (->string (fix-name str)) ">")) ) ) )
(define (->symbol s)
(if (symbol? s)
s
(string->symbol s) ) )
(define (parse-easy-ffi text)
(lexer-init 'string text)
(set! processed-output '())
(set! pp-conditional-stack '())
(set! pp-process #t)
(let ([chunks (chunkify)])
;;(pretty-print chunks)
(for-each parse chunks)
(when (and (pair? defined-classes)
(not (member "tinyclos" used-units))
(not explicit-use-flag) )
(set! used-units (append used-units '("tinyclos"))) )
(reverse processed-output) ) )
(define (parse-easy-ffi-rec port)
(lexer-init 'port port)
(let* ([output processed-output]
[chunks (chunkify)] )
(set! processed-output '())
(for-each parse chunks)
(set! processed-output (append output processed-output)) ) )
(define (register-ffi-macro name)
(set! macro-table (cons (list (string->symbol name) '* '()) macro-table)) )
(define (resolve-ffi-include-file fname)
(find file-exists? (map (cut make-pathname <> fname) ffi-include-path-list)) )
(define (foreign-type->class ftype)
(let rec ([ftype ftype])
(match ftype
['char '<char>]
['bool '<boolean>]
['c-string '<string>]
[(or 'unsigned-char 'int 'unsigned-int 'short 'unsigned-short) '<exact>]
[(or 'long 'unsigned-long 'integer 'unsigned-integer) '<integer>]
[(or 'float 'double) '<inexact>]
[('enum _) '<exact>]
[('const t) (rec t)]
[('function . _) '<pointer>]
[('instance _ c) c]
[((or 'pointer 'c-pointer 'ref) _) '<pointer>]
['u8vector '<u8vector>]
['s8vector '<s8vector>]
['u16vector '<u16vector>]
['s16vector '<s16vector>]
['u32vector '<u32vector>]
['s32vector '<s32vector>]
['f32vector '<f32vector>]
['f64vector '<f64vector>]
[_ '<top>] ) ) )
(define (gen-spec-list args)
(map (lambda (t) (list (gensym) (foreign-type->class t))) args) )
(define strdowncase
(let ([cs case-sensitive])
(lambda (str)
(if (cs)
str
(let ([s2 (string-copy str)]
[len (string-length str)] )
(do ([i (sub1 len) (sub1 i)])
((negative? i) s2)
(string-set! s2 i (char-downcase (string-ref str i))) ) ) ) ) ) )
;;; C syntax checker:
(define syntax-check-location #f)
(define (check-syntax-error text)
(lambda (fstr . args)
(quit #<<EOF
suspicious code fragment~A:
------------------------------------------------------------
~A
------------------------------------------------------------
~?
EOF
(if syntax-check-location
(sprintf " in `~A' form" syntax-check-location)
"")
text
fstr
args) ) )
(define (check-c-syntax text . loc)
(unless no-c-syntax-checks
(fluid-let ([parsing-error (check-syntax-error text)]
[syntax-check-location (:optional loc #f)] )
(define (checkp p s)
(cond [(null? s) (parsing-error "unbalanced parantheses - missing match to `~A'" p)]
[(not (eq? p (car s)))
(parsing-error "unbalanced parantheses - expected `~A', but found `~A'" p (car s)) ] ) )
(define (checkpp p s)
(cond [(null? s) (parsing-error "unbalanced parantheses - missing match to `~A'" p)]
[(not (equal? p (car s)))
(parsing-error "unbalanced preprocessor conditional - expected `~A', but found `~A'" p (car s)) ] ) )
(lexer-init 'string text)
(set! pp-process #t)
(let loop ([pstack '()] [ppstack '()])
(let ([t (lexer)])
(case t
[(stop)
(when (pair? pstack)
(parsing-error "unbalanced parentheses - missing `~A'" (car pstack)) )
(when (pair? ppstack)
(parsing-error "unbalanced preprocessor command - missing `~A'" (car ppstack)) ) ]
[(pp-else)
(checkpp "#endif" ppstack)
(loop pstack ppstack) ]
[(pp-endif)
(checkpp "#endif" ppstack)
(loop pstack (cdr ppstack)) ]
[(pp-if pp-ifdef pp-ifndef)
(loop pstack (cons "#endif" ppstack)) ]
[(open-curly)
(loop (cons #\} pstack) ppstack) ]
[(close-curly)
(checkp #\} pstack)
(loop (cdr pstack) ppstack) ]
[(open-paren)
(loop (cons #\) pstack) ppstack) ]
[(close-paren)
(checkp #\) pstack)
(loop (cdr pstack) ppstack) ]
[(open-bracket)
(loop (cons #\] pstack) ppstack) ]
[(close-bracket)
(checkp #\] pstack)
(loop (cdr pstack) ppstack) ]
[else (loop pstack ppstack)] ) ) ) ) ) )
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