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5161a3c0 AW |
1 | ;;; -*- mode: scheme; coding: utf-8; -*- |
2 | ||
747bd534 | 3 | ;;;; Copyright (C) 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc. |
5161a3c0 AW |
4 | ;;;; |
5 | ;;;; This library is free software; you can redistribute it and/or | |
6 | ;;;; modify it under the terms of the GNU Lesser General Public | |
7 | ;;;; License as published by the Free Software Foundation; either | |
8 | ;;;; version 3 of the License, or (at your option) any later version. | |
9 | ;;;; | |
10 | ;;;; This library is distributed in the hope that it will be useful, | |
11 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | ;;;; Lesser General Public License for more details. | |
14 | ;;;; | |
15 | ;;;; You should have received a copy of the GNU Lesser General Public | |
16 | ;;;; License along with this library; if not, write to the Free Software | |
17 | ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | ;;;; | |
19 | ||
20 | \f | |
21 | ||
22 | ;;; Commentary: | |
23 | ||
b2b554ef AW |
24 | ;;; Scheme eval, written in Scheme. |
25 | ;;; | |
26 | ;;; Expressions are first expanded, by the syntax expander (i.e. | |
27 | ;;; psyntax), then memoized into internal forms. The evaluator itself | |
28 | ;;; only operates on the internal forms ("memoized expressions"). | |
29 | ;;; | |
30 | ;;; Environments are represented as linked lists of the form (VAL ... . | |
31 | ;;; MOD). If MOD is #f, it means the environment was captured before | |
32 | ;;; modules were booted. If MOD is the literal value '(), we are | |
33 | ;;; evaluating at the top level, and so should track changes to the | |
34 | ;;; current module. | |
35 | ;;; | |
36 | ;;; Evaluate this in Emacs to make code indentation work right: | |
37 | ;;; | |
38 | ;;; (put 'memoized-expression-case 'scheme-indent-function 1) | |
5161a3c0 AW |
39 | ;;; |
40 | ||
41 | ;;; Code: | |
42 | ||
43 | \f | |
44 | ||
5161a3c0 AW |
45 | (eval-when (compile) |
46 | (define-syntax capture-env | |
47 | (syntax-rules () | |
bb0c8157 AW |
48 | ((_ (exp ...)) |
49 | (let ((env (exp ...))) | |
50 | (capture-env env))) | |
5161a3c0 AW |
51 | ((_ env) |
52 | (if (null? env) | |
53 | (current-module) | |
54 | (if (not env) | |
b2b554ef AW |
55 | ;; the and current-module checks that modules are booted, |
56 | ;; and thus the-root-module is defined | |
5f161164 | 57 | (and (current-module) the-root-module) |
5161a3c0 AW |
58 | env))))) |
59 | ||
cfc28c80 AW |
60 | (define-syntax env-toplevel |
61 | (syntax-rules () | |
62 | ((_ env) | |
63 | (let lp ((e env)) | |
64 | (if (vector? e) | |
65 | (lp (vector-ref e 0)) | |
66 | e))))) | |
67 | ||
68 | (define-syntax make-env | |
69 | (syntax-rules () | |
70 | ((_ n init next) | |
71 | (let ((v (make-vector (1+ n) init))) | |
72 | (vector-set! v 0 next) | |
73 | v)))) | |
74 | ||
75 | (define-syntax make-env* | |
76 | (syntax-rules () | |
77 | ((_ next init ...) | |
78 | (vector next init ...)))) | |
79 | ||
80 | (define-syntax env-ref | |
81 | (syntax-rules () | |
82 | ((_ env depth width) | |
83 | (let lp ((e env) (d depth)) | |
84 | (if (zero? d) | |
85 | (vector-ref e (1+ width)) | |
86 | (lp (vector-ref e 0) (1- d))))))) | |
87 | ||
88 | (define-syntax env-set! | |
89 | (syntax-rules () | |
90 | ((_ env depth width val) | |
91 | (let lp ((e env) (d depth)) | |
92 | (if (zero? d) | |
93 | (vector-set! e (1+ width) val) | |
94 | (lp (vector-ref e 0) (1- d))))))) | |
95 | ||
d8a071fc AW |
96 | ;; Fast case for procedures with fixed arities. |
97 | (define-syntax make-fixed-closure | |
4abb824c | 98 | (lambda (x) |
9331f91c | 99 | (define *max-static-argument-count* 8) |
4abb824c AW |
100 | (define (make-formals n) |
101 | (map (lambda (i) | |
102 | (datum->syntax | |
c438cd71 | 103 | x |
4abb824c AW |
104 | (string->symbol |
105 | (string (integer->char (+ (char->integer #\a) i)))))) | |
106 | (iota n))) | |
107 | (syntax-case x () | |
d8a071fc | 108 | ((_ eval nreq body env) (not (identifier? #'env)) |
4abb824c | 109 | #'(let ((e env)) |
d8a071fc AW |
110 | (make-fixed-closure eval nreq body e))) |
111 | ((_ eval nreq body env) | |
4abb824c AW |
112 | #`(case nreq |
113 | #,@(map (lambda (nreq) | |
114 | (let ((formals (make-formals nreq))) | |
115 | #`((#,nreq) | |
d8a071fc AW |
116 | (lambda (#,@formals) |
117 | (eval body | |
cfc28c80 | 118 | (make-env* env #,@formals)))))) |
4abb824c AW |
119 | (iota *max-static-argument-count*)) |
120 | (else | |
121 | #,(let ((formals (make-formals *max-static-argument-count*))) | |
122 | #`(lambda (#,@formals . more) | |
cfc28c80 AW |
123 | (let ((env (make-env nreq #f env))) |
124 | #,@(map (lambda (formal n) | |
125 | #`(env-set! env 0 #,n #,formal)) | |
126 | formals (iota (length formals))) | |
127 | (let lp ((i #,*max-static-argument-count*) | |
128 | (args more)) | |
129 | (cond | |
130 | ((= i nreq) | |
4abb824c | 131 | (eval body |
d8a071fc | 132 | (if (null? args) |
cfc28c80 | 133 | env |
d8a071fc AW |
134 | (scm-error 'wrong-number-of-args |
135 | "eval" "Wrong number of arguments" | |
cfc28c80 AW |
136 | '() #f)))) |
137 | ((null? args) | |
138 | (scm-error 'wrong-number-of-args | |
139 | "eval" "Wrong number of arguments" | |
140 | '() #f)) | |
141 | (else | |
142 | (env-set! env 0 i (car args)) | |
143 | (lp (1+ i) (cdr args)))))))))))))) | |
4abb824c | 144 | |
a4b64fa2 AW |
145 | ;; Fast case for procedures with fixed arities and a rest argument. |
146 | (define-syntax make-rest-closure | |
147 | (lambda (x) | |
148 | (define *max-static-argument-count* 3) | |
149 | (define (make-formals n) | |
150 | (map (lambda (i) | |
151 | (datum->syntax | |
152 | x | |
153 | (string->symbol | |
154 | (string (integer->char (+ (char->integer #\a) i)))))) | |
155 | (iota n))) | |
156 | (syntax-case x () | |
157 | ((_ eval nreq body env) (not (identifier? #'env)) | |
158 | #'(let ((e env)) | |
159 | (make-rest-closure eval nreq body e))) | |
160 | ((_ eval nreq body env) | |
161 | #`(case nreq | |
162 | #,@(map (lambda (nreq) | |
163 | (let ((formals (make-formals nreq))) | |
164 | #`((#,nreq) | |
165 | (lambda (#,@formals . rest) | |
166 | (eval body | |
cfc28c80 | 167 | (make-env* env #,@formals rest)))))) |
a4b64fa2 AW |
168 | (iota *max-static-argument-count*)) |
169 | (else | |
170 | #,(let ((formals (make-formals *max-static-argument-count*))) | |
171 | #`(lambda (#,@formals . more) | |
cfc28c80 AW |
172 | (let ((env (make-env (1+ nreq) #f env))) |
173 | #,@(map (lambda (formal n) | |
174 | #`(env-set! env 0 #,n #,formal)) | |
175 | formals (iota (length formals))) | |
176 | (let lp ((i #,*max-static-argument-count*) | |
177 | (args more)) | |
178 | (cond | |
179 | ((= i nreq) | |
180 | (env-set! env 0 nreq args) | |
181 | (eval body env)) | |
182 | ((null? args) | |
183 | (scm-error 'wrong-number-of-args | |
184 | "eval" "Wrong number of arguments" | |
185 | '() #f)) | |
186 | (else | |
187 | (env-set! env 0 i (car args)) | |
188 | (lp (1+ i) (cdr args)))))))))))))) | |
a4b64fa2 | 189 | |
9331f91c AW |
190 | (define-syntax call |
191 | (lambda (x) | |
192 | (define *max-static-call-count* 4) | |
193 | (syntax-case x () | |
194 | ((_ eval proc nargs args env) (identifier? #'env) | |
195 | #`(case nargs | |
196 | #,@(map (lambda (nargs) | |
197 | #`((#,nargs) | |
198 | (proc | |
199 | #,@(map | |
200 | (lambda (n) | |
201 | (let lp ((n n) (args #'args)) | |
202 | (if (zero? n) | |
203 | #`(eval (car #,args) env) | |
204 | (lp (1- n) #`(cdr #,args))))) | |
205 | (iota nargs))))) | |
206 | (iota *max-static-call-count*)) | |
207 | (else | |
208 | (apply proc | |
209 | #,@(map | |
210 | (lambda (n) | |
211 | (let lp ((n n) (args #'args)) | |
212 | (if (zero? n) | |
213 | #`(eval (car #,args) env) | |
214 | (lp (1- n) #`(cdr #,args))))) | |
215 | (iota *max-static-call-count*)) | |
216 | (let lp ((exps #,(let lp ((n *max-static-call-count*) | |
217 | (args #'args)) | |
218 | (if (zero? n) | |
219 | args | |
220 | (lp (1- n) #`(cdr #,args))))) | |
221 | (args '())) | |
222 | (if (null? exps) | |
223 | (reverse args) | |
224 | (lp (cdr exps) | |
225 | (cons (eval (car exps) env) args))))))))))) | |
226 | ||
b2b554ef AW |
227 | ;; This macro could be more straightforward if the compiler had better |
228 | ;; copy propagation. As it is we do some copy propagation by hand. | |
5161a3c0 AW |
229 | (define-syntax mx-bind |
230 | (lambda (x) | |
231 | (syntax-case x () | |
232 | ((_ data () body) | |
233 | #'body) | |
234 | ((_ data (a . b) body) (and (identifier? #'a) (identifier? #'b)) | |
235 | #'(let ((a (car data)) | |
236 | (b (cdr data))) | |
237 | body)) | |
238 | ((_ data (a . b) body) (identifier? #'a) | |
239 | #'(let ((a (car data)) | |
240 | (xb (cdr data))) | |
241 | (mx-bind xb b body))) | |
242 | ((_ data (a . b) body) | |
243 | #'(let ((xa (car data)) | |
244 | (xb (cdr data))) | |
245 | (mx-bind xa a (mx-bind xb b body)))) | |
246 | ((_ data v body) (identifier? #'v) | |
247 | #'(let ((v data)) | |
248 | body))))) | |
249 | ||
b2b554ef AW |
250 | ;; The resulting nested if statements will be an O(n) dispatch. Once |
251 | ;; we compile `case' effectively, this situation will improve. | |
5161a3c0 AW |
252 | (define-syntax mx-match |
253 | (lambda (x) | |
254 | (syntax-case x (quote) | |
255 | ((_ mx data tag) | |
256 | #'(error "what" mx)) | |
257 | ((_ mx data tag (('type pat) body) c* ...) | |
258 | #`(if (eqv? tag #,(or (memoized-typecode (syntax->datum #'type)) | |
259 | (error "not a typecode" #'type))) | |
260 | (mx-bind data pat body) | |
261 | (mx-match mx data tag c* ...)))))) | |
262 | ||
263 | (define-syntax memoized-expression-case | |
264 | (lambda (x) | |
265 | (syntax-case x () | |
266 | ((_ mx c ...) | |
267 | #'(let ((tag (memoized-expression-typecode mx)) | |
268 | (data (memoized-expression-data mx))) | |
269 | (mx-match mx data tag c ...))))))) | |
270 | ||
271 | ||
21ec0bd9 AW |
272 | ;;; |
273 | ;;; On 18 Feb 2010, I did a profile of how often the various memoized expression | |
274 | ;;; types occur when getting to a prompt on a fresh build. Here are the numbers | |
275 | ;;; I got: | |
276 | ;;; | |
277 | ;;; lexical-ref: 32933054 | |
278 | ;;; call: 20281547 | |
279 | ;;; toplevel-ref: 13228724 | |
280 | ;;; if: 9156156 | |
281 | ;;; quote: 6610137 | |
282 | ;;; let: 2619707 | |
283 | ;;; lambda: 1010921 | |
284 | ;;; begin: 948945 | |
285 | ;;; lexical-set: 509862 | |
286 | ;;; call-with-values: 139668 | |
287 | ;;; apply: 49402 | |
288 | ;;; module-ref: 14468 | |
289 | ;;; define: 1259 | |
290 | ;;; toplevel-set: 328 | |
21ec0bd9 AW |
291 | ;;; call/cc: 0 |
292 | ;;; module-set: 0 | |
293 | ;;; | |
294 | ;;; So until we compile `case' into a computed goto, we'll order the clauses in | |
295 | ;;; `eval' in this order, to put the most frequent cases first. | |
296 | ;;; | |
297 | ||
5161a3c0 AW |
298 | (define primitive-eval |
299 | (let () | |
a4b64fa2 AW |
300 | ;; We pre-generate procedures with fixed arities, up to some number |
301 | ;; of arguments, and some rest arities; see make-fixed-closure and | |
302 | ;; make-rest-closure above. | |
d8a071fc AW |
303 | |
304 | ;; A unique marker for unbound keywords. | |
305 | (define unbound-arg (list 'unbound-arg)) | |
306 | ||
7572ee52 AW |
307 | ;; Procedures with rest, optional, or keyword arguments, potentially with |
308 | ;; multiple arities, as with case-lambda. | |
d8a071fc | 309 | (define (make-general-closure env body nreq rest? nopt kw inits alt) |
7572ee52 | 310 | (define alt-proc |
a4b64fa2 | 311 | (and alt ; (body docstring nreq ...) |
dc3e203e | 312 | (let* ((body (car alt)) |
c438cd71 LC |
313 | (spec (cddr alt)) |
314 | (nreq (car spec)) | |
315 | (rest (if (null? (cdr spec)) #f (cadr spec))) | |
316 | (tail (and (pair? (cdr spec)) (pair? (cddr spec)) (cddr spec))) | |
dc3e203e AW |
317 | (nopt (if tail (car tail) 0)) |
318 | (kw (and tail (cadr tail))) | |
319 | (inits (if tail (caddr tail) '())) | |
320 | (alt (and tail (cadddr tail)))) | |
321 | (make-general-closure env body nreq rest nopt kw inits alt)))) | |
f3cf9421 AW |
322 | (define (set-procedure-arity! proc) |
323 | (let lp ((alt alt) (nreq nreq) (nopt nopt) (rest? rest?)) | |
324 | (if (not alt) | |
fc835b1b AW |
325 | (begin |
326 | (set-procedure-property! proc 'arglist | |
327 | (list nreq | |
328 | nopt | |
329 | (if kw (cdr kw) '()) | |
330 | (and kw (car kw)) | |
331 | (and rest? '_))) | |
332 | (set-procedure-minimum-arity! proc nreq nopt rest?)) | |
c438cd71 LC |
333 | (let* ((spec (cddr alt)) |
334 | (nreq* (car spec)) | |
335 | (rest?* (if (null? (cdr spec)) #f (cadr spec))) | |
336 | (tail (and (pair? (cdr spec)) (pair? (cddr spec)) (cddr spec))) | |
f3cf9421 AW |
337 | (nopt* (if tail (car tail) 0)) |
338 | (alt* (and tail (cadddr tail)))) | |
339 | (if (or (< nreq* nreq) | |
340 | (and (= nreq* nreq) | |
341 | (if rest? | |
342 | (and rest?* (> nopt* nopt)) | |
343 | (or rest?* (> nopt* nopt))))) | |
344 | (lp alt* nreq* nopt* rest?*) | |
345 | (lp alt* nreq nopt rest?))))) | |
346 | proc) | |
347 | (set-procedure-arity! | |
348 | (lambda %args | |
cfc28c80 AW |
349 | (define (npositional args) |
350 | (let lp ((n 0) (args args)) | |
351 | (if (or (null? args) | |
352 | (and (>= n nreq) (keyword? (car args)))) | |
353 | n | |
354 | (lp (1+ n) (cdr args))))) | |
355 | (let ((nargs (length %args))) | |
356 | (cond | |
357 | ((or (< nargs nreq) | |
358 | (and (not kw) (not rest?) (> nargs (+ nreq nopt))) | |
359 | (and kw (not rest?) (> (npositional %args) (+ nreq nopt)))) | |
360 | (if alt | |
361 | (apply alt-proc %args) | |
362 | ((scm-error 'wrong-number-of-args | |
363 | "eval" "Wrong number of arguments" | |
364 | '() #f)))) | |
365 | (else | |
366 | (let* ((nvals (+ nreq (if rest? 1 0) (length inits))) | |
367 | (env (make-env nvals unbound-arg env))) | |
368 | (let lp ((i 0) (args %args)) | |
369 | (cond | |
370 | ((< i nreq) | |
371 | ;; Bind required arguments. | |
372 | (env-set! env 0 i (car args)) | |
373 | (lp (1+ i) (cdr args))) | |
374 | ((not kw) | |
375 | ;; Optional args (possibly), but no keyword args. | |
376 | (let lp ((i i) (args args) (inits inits)) | |
581f410f | 377 | (cond |
cfc28c80 AW |
378 | ((< i (+ nreq nopt)) |
379 | (cond | |
380 | ((< i nargs) | |
381 | (env-set! env 0 i (car args)) | |
382 | (lp (1+ i) (cdr args) (cdr inits))) | |
383 | (else | |
384 | (env-set! env 0 i (eval (car inits) env)) | |
385 | (lp (1+ i) args (cdr inits))))) | |
581f410f | 386 | (else |
cfc28c80 AW |
387 | (when rest? |
388 | (env-set! env 0 i args)) | |
389 | (eval body env))))) | |
390 | (else | |
391 | ;; Optional args. As before, but stop at the first | |
392 | ;; keyword. | |
393 | (let lp ((i i) (args args) (inits inits)) | |
394 | (cond | |
395 | ((< i (+ nreq nopt)) | |
396 | (cond | |
397 | ((and (< i nargs) (not (keyword? (car args)))) | |
398 | (env-set! env 0 i (car args)) | |
399 | (lp (1+ i) (cdr args) (cdr inits))) | |
400 | (else | |
401 | (env-set! env 0 i (eval (car inits) env)) | |
402 | (lp (1+ i) args (cdr inits))))) | |
403 | (else | |
404 | (when rest? | |
405 | (env-set! env 0 i args)) | |
406 | (let ((aok (car kw)) | |
407 | (kw (cdr kw)) | |
408 | (kw-base (if rest? (1+ i) i))) | |
581f410f AW |
409 | ;; Now scan args for keywords. |
410 | (let lp ((args args)) | |
cfc28c80 AW |
411 | (cond |
412 | ((and (pair? args) (pair? (cdr args)) | |
413 | (keyword? (car args))) | |
414 | (let ((kw-pair (assq (car args) kw)) | |
415 | (v (cadr args))) | |
416 | (if kw-pair | |
417 | ;; Found a known keyword; set its value. | |
418 | (env-set! env 0 (cdr kw-pair) v) | |
419 | ;; Unknown keyword. | |
420 | (if (not aok) | |
421 | ((scm-error | |
422 | 'keyword-argument-error | |
423 | "eval" "Unrecognized keyword" | |
424 | '() (list (car args)))))) | |
425 | (lp (cddr args)))) | |
426 | ((pair? args) | |
427 | (if rest? | |
428 | ;; Be lenient parsing rest args. | |
429 | (lp (cdr args)) | |
430 | ((scm-error 'keyword-argument-error | |
431 | "eval" "Invalid keyword" | |
432 | '() (list (car args)))))) | |
433 | (else | |
434 | ;; Finished parsing keywords. Fill in | |
435 | ;; uninitialized kwargs by evalling init | |
436 | ;; expressions in their appropriate | |
437 | ;; environment. | |
438 | (let lp ((i kw-base) (inits inits)) | |
439 | (cond | |
440 | ((pair? inits) | |
441 | (when (eq? (env-ref env 0 i) unbound-arg) | |
442 | (env-set! env 0 i (eval (car inits) env))) | |
443 | (lp (1+ i) (cdr inits))) | |
444 | (else | |
445 | ;; Finally, eval the body. | |
446 | (eval body env))))))))))))))))))))) | |
d8a071fc | 447 | |
b2b554ef | 448 | ;; The "engine". EXP is a memoized expression. |
5161a3c0 AW |
449 | (define (eval exp env) |
450 | (memoized-expression-case exp | |
cfc28c80 AW |
451 | (('lexical-ref (depth . width)) |
452 | (env-ref env depth width)) | |
bb0c8157 | 453 | |
21ec0bd9 AW |
454 | (('call (f nargs . args)) |
455 | (let ((proc (eval f env))) | |
456 | (call eval proc nargs args env))) | |
457 | ||
458 | (('toplevel-ref var-or-sym) | |
459 | (variable-ref | |
460 | (if (variable? var-or-sym) | |
461 | var-or-sym | |
bb0c8157 | 462 | (memoize-variable-access! exp |
cfc28c80 | 463 | (capture-env (env-toplevel env)))))) |
21ec0bd9 | 464 | |
5161a3c0 AW |
465 | (('if (test consequent . alternate)) |
466 | (if (eval test env) | |
467 | (eval consequent env) | |
468 | (eval alternate env))) | |
469 | ||
21ec0bd9 AW |
470 | (('quote x) |
471 | x) | |
472 | ||
5161a3c0 | 473 | (('let (inits . body)) |
cfc28c80 AW |
474 | (let* ((width (vector-length inits)) |
475 | (new-env (make-env width #f (capture-env env)))) | |
476 | (let lp ((i 0)) | |
477 | (when (< i width) | |
478 | (env-set! new-env 0 i (eval (vector-ref inits i) env)) | |
479 | (lp (1+ i)))) | |
480 | (eval body new-env))) | |
c438cd71 LC |
481 | |
482 | (('lambda (body docstring nreq . tail)) | |
483 | (let ((proc | |
484 | (if (null? tail) | |
485 | (make-fixed-closure eval nreq body (capture-env env)) | |
486 | (if (null? (cdr tail)) | |
a4b64fa2 | 487 | (make-rest-closure eval nreq body (capture-env env)) |
c438cd71 LC |
488 | (apply make-general-closure (capture-env env) |
489 | body nreq tail))))) | |
490 | (when docstring | |
491 | (set-procedure-property! proc 'documentation docstring)) | |
492 | proc)) | |
d8a071fc | 493 | |
6fc3eae4 AW |
494 | (('seq (head . tail)) |
495 | (begin | |
496 | (eval head env) | |
497 | (eval tail env))) | |
498 | ||
cfc28c80 AW |
499 | (('lexical-set! ((depth . width) . x)) |
500 | (env-set! env depth width (eval x env))) | |
5161a3c0 | 501 | |
21ec0bd9 AW |
502 | (('call-with-values (producer . consumer)) |
503 | (call-with-values (eval producer env) | |
504 | (eval consumer env))) | |
505 | ||
506 | (('apply (f args)) | |
507 | (apply (eval f env) (eval args env))) | |
508 | ||
509 | (('module-ref var-or-spec) | |
5161a3c0 | 510 | (variable-ref |
21ec0bd9 AW |
511 | (if (variable? var-or-spec) |
512 | var-or-spec | |
513 | (memoize-variable-access! exp #f)))) | |
5161a3c0 | 514 | |
21ec0bd9 | 515 | (('define (name . x)) |
ee15aa46 AW |
516 | (let ((x (eval x env))) |
517 | (if (and (procedure? x) (not (procedure-property x 'name))) | |
518 | (set-procedure-property! x 'name name)) | |
adb8054c MW |
519 | (define! name x) |
520 | (if #f #f))) | |
21ec0bd9 | 521 | |
5161a3c0 AW |
522 | (('toplevel-set! (var-or-sym . x)) |
523 | (variable-set! | |
524 | (if (variable? var-or-sym) | |
525 | var-or-sym | |
bb0c8157 | 526 | (memoize-variable-access! exp |
cfc28c80 | 527 | (capture-env (env-toplevel env)))) |
5161a3c0 AW |
528 | (eval x env))) |
529 | ||
1773bc7d AW |
530 | (('call-with-prompt (tag thunk . handler)) |
531 | (call-with-prompt | |
532 | (eval tag env) | |
533 | (eval thunk env) | |
534 | (eval handler env))) | |
747022e4 | 535 | |
21ec0bd9 AW |
536 | (('call/cc proc) |
537 | (call/cc (eval proc env))) | |
5161a3c0 AW |
538 | |
539 | (('module-set! (x . var-or-spec)) | |
540 | (variable-set! | |
541 | (if (variable? var-or-spec) | |
542 | var-or-spec | |
543 | (memoize-variable-access! exp #f)) | |
544 | (eval x env))))) | |
545 | ||
b2b554ef | 546 | ;; primitive-eval |
5161a3c0 | 547 | (lambda (exp) |
b2b554ef | 548 | "Evaluate @var{exp} in the current module." |
5161a3c0 | 549 | (eval |
a310a1d1 AW |
550 | (memoize-expression |
551 | (if (macroexpanded? exp) | |
552 | exp | |
553 | ((module-transformer (current-module)) exp))) | |
5161a3c0 | 554 | '())))) |