1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
;;; foreign.ss
;;; Copyright (c) 1997 R. Kent Dybvig
;;; 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.
;;; Prototype code for converting ``foreign-callable'' declarations into
;;; C interface routines to support C calls to Scheme procedures with
;;; automatic datatype conversion analogous to that provided for Scheme
;;; calls to C procedures via foreign-procedure.
;;; Todo
;;; - support for foreign-pointer and foreign-object
;;; - similar support for foreign-procedure declarations
(define spec->decl
(lambda (spec)
(case spec
[(integer-32 boolean) "int"]
[(unsigned-32) "unsigned int"]
[(char) "char"]
[(string) "char *"]
[(fixnum) "int"]
[(double-float) "double"]
[(single-float) "float"]
[(void) "void"]
[(scheme-object) "ptr"]
[else
(record-case spec
[(foreign-pointer foreign-object) ()
(error 'spec->decl "unsupported specifier ~s" spec)]
[else (error 'spec->decl "unexpected specifier ~s" spec)])])))
(define C->Scheme
(lambda (spec id)
(case spec
[(boolean) (format "Sboolean(~a)" id)]
[(char) (format "Schar(~a)" id)]
[(fixnum) (format "Sfixnum(~a)" id)]
[(integer-32) (format "Sinteger(~a)" id)]
[(unsigned-32) (format "Sunsigned(~a)" id)]
[(single-float) (format "Sflonum((double)~a)" id)]
[(double-float) (format "Sflonum(~a)" id)]
[(scheme-object) id]
[(string) (format "Sstring(~a)" id)]
[else
(record-case spec
[(foreign-pointer foreign-object) ()
(error 'C->Scheme "unsupported specifier ~s" spec)]
[else (error 'C->Scheme "unexpected specifier ~s" spec)])])))
(define Scheme->C
(lambda (op spec src)
(case spec
[(boolean) (fprintf op "Sboolean_value(~a)" src)]
[(char) (fprintf op "Schar_value(~a)" src)]
[(fixnum) (fprintf op "Sfixnum_value(~a)" src)]
[(integer-32) (fprintf op "Sinteger_value(~a)" src)]
[(unsigned-32) (fprintf op "Sunsigned_value(~a)" src)]
[(single-float) (fprintf op "(float)Sflonum_value(~a)" src)]
[(double-float) (fprintf op "Sflonum_value(~a)" src)]
[(scheme-object) (display src op)]
[(string) (fprintf op "Sstring_value(~a)" src)]
[else
(record-case spec
[(foreign-pointer foreign-object) ()
(error 'Scheme->C "unsupported specifier ~s" spec)]
[else (error 'Scheme->C "unexpected specifier ~s" spec)])])))
(define gen-fcallable
(case-lambda
[(cname arg-specs res-spec)
(gen-fcallable (current-output-port) cname arg-specs res-spec)]
[(op cname arg-specs res-spec)
(let ((names (let loop ((ls arg-specs) (i 1))
(if (null? ls)
'()
(cons (format "x~d" i) (loop (cdr ls) (+ i 1))))))
(count (length arg-specs)))
(newline op)
(fprintf op "~a ~a(ptr proc" (spec->decl res-spec) cname) ;)
(let loop ((arg-specs arg-specs) (names names))
(unless (null? arg-specs)
(fprintf op ", ~a ~a" (spec->decl (car arg-specs)) (car names))
(loop (cdr arg-specs) (cdr names)))) ;(
(fprintf op ") {~%")
(if (<= 0 count 3)
(begin
(display " return " op)
(Scheme->C op res-spec
(let ((op (open-output-string)))
(fprintf op "Scall~d(proc" count) ;)
(let loop ((arg-specs arg-specs) (names names))
(unless (null? arg-specs)
(display ", " op)
(display (C->Scheme (car arg-specs) (car names)) op)
(loop (cdr arg-specs) (cdr names)))) ;(
(fprintf op ")")
(get-output-string op))))
(begin
(fprintf op " Sinitframe(~d);~%" count)
(let loop ([arg-specs arg-specs] [names names] [num 1])
(unless (null? arg-specs)
(fprintf op " Sput_arg(~d, ~a);~%"
num (C->Scheme (car arg-specs) (car names)))
(loop (cdr arg-specs) (cdr names) (+ num 1))))
(fprintf op " return ")
(Scheme->C op res-spec
(format "Scall(proc, ~d)" count))))
(fprintf op ";~%}~%"))]))
(define-syntax foreign-callable
(syntax-rules ()
((_ n args res)
(gen-fcallable n 'args 'res))))
(define gen-file
(lambda (fnroot)
(let ((ifn (format "~a.ss" fnroot))
(ofn (format "~a.xx" fnroot)))
(with-output-to-file ofn
(lambda () (load ifn))
'replace))))
#!eof ; cut off the input here so we can give examples w/o comment chars
Example input file:
------------------------------------------------------------------------
(foreign-callable "foo"
(boolean single-float double-float)
scheme-object)
(foreign-callable "bar"
(boolean char integer-32 unsigned-32 single-float
double-float scheme-object)
string)
(foreign-callable "baz" () fixnum)
------------------------------------------------------------------------
Generated output file:
------------------------------------------------------------------------
ptr foo(ptr proc, int x1, float x2, double x3) {
return Scall3(proc, Sboolean(x1), Sflonum((double)x2), Sflonum(x3));
}
char * bar(ptr proc, int x1, char x2, int x3, unsigned int x4, float x5, double x6, ptr x7) {
Sinitframe(7);
Sput_arg(1, Sboolean(x1));
Sput_arg(2, Schar(x2));
Sput_arg(3, Sinteger(x3));
Sput_arg(4, Sunsigned(x4));
Sput_arg(5, Sflonum((double)x5));
Sput_arg(6, Sflonum(x6));
Sput_arg(7, x7);
return Sstring_value(Scall(proc, 7));
}
int baz(ptr proc) {
return Sfixnum_value(Scall0(proc));
}
------------------------------------------------------------------------
|
