1 /* -*-comment-start: "//";comment-end:""-*-
2 * Mes --- Maxwell Equations of Software
3 * Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
5 * This file is part of Mes.
7 * Mes is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3 of the License, or (at
10 * your option) any later version.
12 * Mes is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Mes. If not, see <http://www.gnu.org/licenses/>.
32 #define FIXED_PRIMITIVES 1
36 int ARENA_SIZE = 1000000;
38 int ARENA_SIZE = 100000;
40 int MAX_ARENA_SIZE = 20000000;
44 enum type_t {CHAR, FUNCTION, KEYWORD, MACRO, NUMBER, PAIR, SPECIAL, STRING, SYMBOL, REF, VALUES, VECTOR, BROKEN_HEART};
45 typedef SCM (*function0_t) (void);
46 typedef SCM (*function1_t) (SCM);
47 typedef SCM (*function2_t) (SCM, SCM);
48 typedef SCM (*function3_t) (SCM, SCM, SCM);
49 typedef SCM (*functionn_t) (SCM);
50 typedef struct function_t {
52 function0_t function0;
53 function1_t function1;
54 function2_t function2;
55 function3_t function3;
56 functionn_t functionn;
61 typedef struct scm_t {
80 scm scm_nil = {SPECIAL, "()"};
81 scm scm_f = {SPECIAL, "#f"};
82 scm scm_t = {SPECIAL, "#t"};
83 scm scm_dot = {SPECIAL, "."};
84 scm scm_arrow = {SPECIAL, "=>"};
85 scm scm_undefined = {SPECIAL, "*undefined*"};
86 scm scm_unspecified = {SPECIAL, "*unspecified*"};
87 scm scm_closure = {SPECIAL, "*closure*"};
88 scm scm_circular = {SPECIAL, "*circular*"};
93 scm scm_begin = {SPECIAL, "*begin*"};
95 scm scm_symbol_lambda = {SYMBOL, "lambda"};
96 scm scm_symbol_begin = {SYMBOL, "begin"};
97 scm scm_symbol_if = {SYMBOL, "if"};
98 scm scm_symbol_define = {SYMBOL, "define"};
99 scm scm_symbol_define_macro = {SYMBOL, "define-macro"};
100 scm scm_symbol_set_x = {SYMBOL, "set!"};
102 scm scm_symbol_quote = {SYMBOL, "quote"};
103 scm scm_symbol_quasiquote = {SYMBOL, "quasiquote"};
104 scm scm_symbol_unquote = {SYMBOL, "unquote"};
105 scm scm_symbol_unquote_splicing = {SYMBOL, "unquote-splicing"};
107 scm scm_symbol_sc_expand = {SYMBOL, "sc-expand"};
108 scm scm_symbol_macro_expand = {SYMBOL, "macro-expand"};
109 scm scm_symbol_sc_expander_alist = {SYMBOL, "*sc-expander-alist*"};
110 scm scm_symbol_noexpand = {SYMBOL, "noexpand"};
111 scm scm_symbol_syntax = {SYMBOL, "syntax"};
112 scm scm_symbol_quasisyntax = {SYMBOL, "quasisyntax"};
113 scm scm_symbol_unsyntax = {SYMBOL, "unsyntax"};
114 scm scm_symbol_unsyntax_splicing = {SYMBOL, "unsyntax-splicing"};
116 scm scm_symbol_call_with_values = {SYMBOL, "call-with-values"};
117 scm scm_symbol_current_module = {SYMBOL, "current-module"};
118 scm scm_symbol_primitive_load = {SYMBOL, "primitive-load"};
119 scm scm_symbol_read_input_file = {SYMBOL, "read-input-file"};
121 scm scm_symbol_car = {SYMBOL, "car"};
122 scm scm_symbol_cdr = {SYMBOL, "cdr"};
123 scm scm_symbol_null_p = {SYMBOL, "null?"};
124 scm scm_symbol_eq_p = {SYMBOL, "eq?"};
125 scm scm_symbol_cons = {SYMBOL, "cons"};
127 scm char_eof = {CHAR, .name="*eof*", .value=-1};
128 scm char_nul = {CHAR, .name="nul", .value=0};
129 scm char_alarm = {CHAR, .name="alarm", .value=8};
130 scm char_backspace = {CHAR, .name="backspace", .value=8};
131 scm char_tab = {CHAR, .name="tab", .value=9};
132 scm char_newline = {CHAR, .name="newline", .value=10};
133 scm char_vtab = {CHAR, .name="vtab", .value=11};
134 scm char_page = {CHAR, .name="page", .value=12};
135 scm char_return = {CHAR, .name="return", .value=13};
136 scm char_space = {CHAR, .name="space", .value=32};
138 scm g_free = {NUMBER, .value=0};
142 #include "mes.symbols.h"
150 function functions[200];
156 SCM r1 = 0; // param 1
157 SCM r2 = 0; // param 2
158 SCM r3 = 0; // param 3
169 #define CAR(x) g_cells[x].car
170 #define CDR(x) g_cells[x].cdr
171 #define HITS(x) g_cells[x].hits
172 #define LENGTH(x) g_cells[x].length
173 #define NAME(x) g_cells[x].name
174 #define STRING(x) g_cells[x].string
175 #define TYPE(x) g_cells[x].type
176 #define MACRO(x) g_cells[x].macro
177 #define REF(x) g_cells[x].ref
178 #define VALUE(x) g_cells[x].value
179 #define VECTOR(x) g_cells[x].vector
180 #define FUNCTION(x) functions[g_cells[x].function]
181 #define NCAR(x) g_news[x].car
182 #define NTYPE(x) g_news[x].type
184 #define CAAR(x) CAR (CAR (x))
185 #define CDAR(x) CDR (CAR (x))
186 #define CAAR(x) CAR (CAR (x))
187 #define CADAR(x) CAR (CDR (CAR (x)))
188 #define CADDR(x) CAR (CDR (CDR (x)))
189 #define CDADAR(x) CAR (CDR (CAR (CDR (x))))
190 #define CADR(x) CAR (CDR (x))
192 SCM display_ (FILE* f, SCM x);
193 SCM vm_call (function0_t f, SCM p1, SCM p2, SCM a);
198 assert (g_free.value + n < ARENA_SIZE);
199 SCM x = g_free.value;
205 make_cell (SCM type, SCM car, SCM cdr)
208 assert (TYPE (type) == NUMBER);
209 TYPE (x) = VALUE (type);
210 if (VALUE (type) == CHAR || VALUE (type) == NUMBER) {
211 if (car) CAR (x) = CAR (car);
212 if (cdr) CDR (x) = CDR (cdr);
213 } else if (VALUE (type) == FUNCTION) {
214 if (car) CAR (x) = car;
215 if (cdr) CDR (x) = CDR (cdr);
226 g_cells[tmp_num].value = PAIR;
227 return make_cell (tmp_num, x, y);
233 assert (TYPE (x) == PAIR);
240 assert (TYPE (x) == PAIR);
248 || ((TYPE (x) == KEYWORD && TYPE (y) == KEYWORD
249 && STRING (x) == STRING (y)))
250 || (TYPE (x) == CHAR && TYPE (y) == CHAR
251 && VALUE (x) == VALUE (y))
252 || (TYPE (x) == NUMBER && TYPE (y) == NUMBER
253 && VALUE (x) == VALUE (y)))
258 set_car_x (SCM x, SCM e)
260 assert (TYPE (x) == PAIR);
262 return cell_unspecified;
266 set_cdr_x (SCM x, SCM e)
268 assert (TYPE (x) == PAIR);
270 return cell_unspecified;
274 set_env_x (SCM x, SCM e, SCM a)
276 SCM p = assert_defined (x, assq (x, a));
277 return set_cdr_x (p, e);
283 return cons (cell_symbol_quote, x);
289 return cons (cell_symbol_quasiquote, x);
295 return cons (cell_symbol_quasisyntax, x);
299 pairlis (SCM x, SCM y, SCM a)
303 if (pair_p (x) == cell_f)
304 return cons (cons (x, y), a);
305 return cons (cons (car (x), car (y)),
306 pairlis (cdr (x), cdr (y), a));
312 while (a != cell_nil && eq_p (x, CAAR (a)) == cell_f)
314 if (TYPE (a) == BROKEN_HEART || TYPE (CAR (a)) == BROKEN_HEART)
315 fprintf (stderr, "oops, broken heart\n");
318 return a != cell_nil ? car (a) : cell_f;
322 assq_ref_cache (SCM x, SCM a)
325 if (x == cell_f) return cell_undefined;
330 assert_defined (SCM x, SCM e)
332 if (e == cell_undefined)
334 fprintf (stderr, "eval: unbound variable:");
335 display_ (stderr, x);
336 fprintf (stderr, "\n");
337 assert (!"unbound variable");
342 enum eval_apply_t {EVLIS, APPLY, EVAL, MACRO_EXPAND, BEGIN, IF, CALL_WITH_VALUES};
343 enum eval_apply_t g_target;
346 call_lambda (SCM e, SCM x, SCM aa, SCM a) ///((internal))
348 SCM cl = cons (cons (cell_closure, x), x);
354 return eval_apply ();
362 case EVLIS: goto evlis;
363 case APPLY: goto apply;
364 case EVAL: goto eval;
365 case MACRO_EXPAND: goto macro_expand;
366 case BEGIN: goto begin;
367 case IF: goto label_if;
368 case CALL_WITH_VALUES: goto call_with_values;
372 if (r1 == cell_nil) return cell_nil;
373 if (TYPE (r1) != PAIR) goto eval; // (r1, r0);
374 r2 = eval_env (car (r1), r0);
375 r1 = evlis_env (cdr (r1), r0);
376 return cons (r2, r1);
379 if (TYPE (r1) != PAIR)
381 if (TYPE (r1) == FUNCTION) return call (r1, r2);
382 if (r1 == cell_symbol_call_with_values)
383 return call_with_values_env (car (r2), cadr (r2), r0);
384 if (r1 == cell_symbol_current_module) return r0;
389 case cell_symbol_lambda:
391 SCM args = cadr (r1);
392 SCM body = cddr (r1);
393 SCM p = pairlis (args, r2, r0);
394 return call_lambda (body, p, p, r0);
398 SCM args = caddr (r1);
399 SCM body = cdddr (r1);
402 SCM p = pairlis (args, r2, aa);
403 return call_lambda (body, p, aa, r0);
406 case cell_symbol_label:
407 return apply_env (caddr (r1), r2, cons (cons (cadr (r1), caddr (r1)), r0));
410 SCM e = eval_env (r1, r0);
411 char const* type = 0;
412 if (e == cell_f || e == cell_t) type = "bool";
413 if (TYPE (e) == CHAR) type = "char";
414 if (TYPE (e) == NUMBER) type = "number";
415 if (TYPE (e) == STRING) type = "string";
416 if (e == cell_unspecified) type = "*unspecified*";
417 if (e == cell_undefined) type = "*undefined*";
420 fprintf (stderr, "cannot apply: %s: ", type);
421 display_ (stderr, e);
422 fprintf (stderr, " [");
423 display_ (stderr, r1);
424 fprintf (stderr, "]\n");
425 assert (!"cannot apply");
427 return apply_env (e, r2, r0);
437 case cell_symbol_car: return car (eval_env (CADR (r1), r0));
438 case cell_symbol_cdr: return cdr (eval_env (CADR (r1), r0));
439 case cell_symbol_cons: {SCM m = evlis_env (CDR (r1), r0);
440 return cons (CAR (m), CADR (m));}
441 case cell_symbol_null_p: return null_p (eval_env (CADR (r1), r0));
442 #endif // FIXED_PRIMITIVES
443 case cell_symbol_quote: return cadr (r1);
445 case cell_symbol_syntax: return cadr (r1);
447 case cell_symbol_begin: return begin_env (r1, r0);
448 case cell_symbol_lambda:
449 return make_closure (cadr (r1), cddr (r1), assq (cell_closure, r0));
450 case cell_closure: return r1;
451 case cell_symbol_if: return if_env (cdr (r1), r0);
453 case cell_symbol_set_x: {
454 SCM x = eval_env (caddr (r1), r0); return set_env_x (cadr (r1), x, r0);
458 SCM x = macro_expand_env (r1, r0);
461 if (TYPE (x) == PAIR)
463 set_cdr_x (r1, cdr (x));
464 set_car_x (r1, car (x));
468 return eval_env (x, r0);
470 SCM m = evlis_env (CDR (r1), r0);
471 return apply_env (car (r1), m, r0);
475 case SYMBOL: return assert_defined (r1, assq_ref_cache (r1, r0));
480 if (TYPE (CAR (r1)) == STRING && string_to_symbol (CAR (r1)) == cell_symbol_noexpand)
485 if (TYPE (r1) == PAIR
486 && (macro = lookup_macro (car (r1), r0)) != cell_f)
487 return apply_env (macro, CDR (r1), r0);
488 else if (TYPE (r1) == PAIR
489 && TYPE (CAR (r1)) == SYMBOL
490 && ((expanders = assq_ref_cache (cell_symbol_sc_expander_alist, r0)) != cell_undefined)
491 && ((macro = assq (CAR (r1), expanders)) != cell_f))
493 SCM sc_expand = assq_ref_cache (cell_symbol_macro_expand, r0);
494 if (sc_expand != cell_undefined && sc_expand != cell_f)
495 r1 = apply_env (sc_expand, cons (r1, cell_nil), r0);
501 r = cell_unspecified;
502 while (r1 != cell_nil) {
503 if (TYPE (r1) == PAIR && TYPE (CAR (r1)) == PAIR)
505 if (caar (r1) == cell_symbol_begin)
506 r1 = append2 (cdar (r1), cdr (r1));
507 else if (caar (r1) == cell_symbol_primitive_load)
509 SCM f = read_input_file_env (r0);
510 r1 = append2 (f, cdr (r1));
513 r = eval_env (car (r1), r0);
520 x = eval_env (car (r1), r0);
522 return eval_env (cadr (r1), r0);
523 if (cddr (r1) != cell_nil)
524 return eval_env (caddr (r1), r0);
525 return cell_unspecified;
529 v = apply_env (r1, cell_nil, r0);
530 if (TYPE (v) == VALUES)
532 return apply_env (r2, v, r0);
538 if ((FUNCTION (fn).arity > 0 || FUNCTION (fn).arity == -1)
539 && x != cell_nil && TYPE (CAR (x)) == VALUES)
540 x = cons (CADAR (x), CDR (x));
541 if ((FUNCTION (fn).arity > 1 || FUNCTION (fn).arity == -1)
542 && x != cell_nil && TYPE (CDR (x)) == PAIR && TYPE (CADR (x)) == VALUES)
543 x = cons (CAR (x), cons (CDADAR (x), CDR (x)));
544 switch (FUNCTION (fn).arity)
546 case 0: return FUNCTION (fn).function0 ();
547 case 1: return FUNCTION (fn).function1 (car (x));
548 case 2: return FUNCTION (fn).function2 (car (x), cadr (x));
549 case 3: return FUNCTION (fn).function3 (car (x), cadr (x), caddr (x));
550 case -1: return FUNCTION (fn).functionn (x);
552 return cell_unspecified;
558 SCM frame = car (stack);
569 SCM frame = cons (r1, cons (r2, cons (r3, cons (r0, cell_nil))));
570 stack = cons (frame, stack);
578 vm_call (function0_t f, SCM p1, SCM p2, SCM a)
580 SCM frame = cons (r1, cons (r2, cons (r3, cons (r0, cell_nil))));
581 stack = cons (frame, stack);
585 if (g_free.value + GC_SAFETY > ARENA_SIZE)
589 frame = gc_frame (stack);
595 evlis_env (SCM m, SCM a)
598 return vm_call (eval_apply, m, cell_undefined, a);
602 apply_env (SCM fn, SCM x, SCM a)
605 return vm_call (eval_apply, fn, x, a);
609 eval_env (SCM e, SCM a)
612 return vm_call (eval_apply, e, cell_undefined, a);
616 macro_expand_env (SCM e, SCM a)
618 g_target = MACRO_EXPAND;
619 return vm_call (eval_apply, e, cell_undefined, a);
623 begin_env (SCM e, SCM a)
626 return vm_call (eval_apply, e, cell_undefined, a);
630 if_env (SCM e, SCM a)
633 return vm_call (eval_apply, e, cell_undefined, a);
637 call_with_values_env (SCM producer, SCM consumer, SCM a)
639 g_target = CALL_WITH_VALUES;
640 return vm_call (eval_apply, producer, consumer, a);
644 append2 (SCM x, SCM y)
646 if (x == cell_nil) return y;
647 assert (TYPE (x) == PAIR);
648 return cons (car (x), append2 (cdr (x), y));
652 append (SCM x) ///((arity . n))
654 if (x == cell_nil) return cell_nil;
655 if (cdr (x) == cell_nil) return car (x);
656 return append2 (car (x), append (cdr (x)));
662 g_cells[tmp_num].value = CHAR;
663 g_cells[tmp_num2].value = x;
664 return make_cell (tmp_num, tmp_num2, tmp_num2);
668 make_function (SCM name, SCM id, SCM arity)
670 g_cells[tmp_num3].value = FUNCTION;
671 function *f = (function*)malloc (sizeof (function));
672 f->arity = VALUE (arity);
673 g_cells[tmp_num4].value = (long)f;
674 return make_cell (tmp_num3, name, tmp_num4);
680 SCM x = internal_lookup_symbol (s);
681 x = x ? x : internal_make_symbol (s);
682 g_cells[tmp_num].value = KEYWORD;
683 return make_cell (tmp_num, STRING (x), 0);
687 make_macro (SCM name, SCM x)
689 g_cells[tmp_num].value = MACRO;
690 return make_cell (tmp_num, STRING (name), x);
696 g_cells[tmp_num].value = NUMBER;
697 g_cells[tmp_num2].value = x;
698 return make_cell (tmp_num, tmp_num2, tmp_num2);
704 g_cells[tmp_num].value = REF;
705 return make_cell (tmp_num, x, x);
711 g_cells[tmp_num].value = STRING;
712 return make_cell (tmp_num, x, 0);
716 cstring_to_list (char const* s)
721 p = cons (make_char (s[i]), p);
728 return x == cell_nil ? cell_t : cell_f;
732 internal_make_symbol (SCM s)
734 g_cells[tmp_num].value = SYMBOL;
735 SCM x = make_cell (tmp_num, s, 0);
736 g_symbols = cons (x, g_symbols);
743 SCM x = internal_lookup_symbol (s);
744 return x ? x : internal_make_symbol (s);
751 g_cells[tmp_num].value = VECTOR;
753 SCM x = make_cell (tmp_num, k, v);
754 for (int i=0; i<k; i++) g_cells[v+i] = g_cells[vector_entry (cell_unspecified)];
759 values (SCM x) ///((arity . n))
767 vector_length (SCM x)
769 assert (TYPE (x) == VECTOR);
770 return make_number (LENGTH (x));
774 vector_ref (SCM x, SCM i)
776 assert (TYPE (x) == VECTOR);
777 assert (VALUE (i) < LENGTH (x));
778 SCM e = VECTOR (x) + VALUE (i);
779 if (TYPE (e) == REF) e = g_cells[e].ref;
780 if (TYPE (e) == CHAR) e = make_char (VALUE (e));
781 if (TYPE (e) == NUMBER) e = make_number (VALUE (e));
786 vector_entry (SCM x) {
787 if (TYPE (x) == PAIR || TYPE (x) == SPECIAL || TYPE (x) == STRING || TYPE (x) == SYMBOL || TYPE (x) == VECTOR) x = make_ref (x);
792 vector_set_x (SCM x, SCM i, SCM e)
794 assert (TYPE (x) == VECTOR);
795 assert (VALUE (i) < LENGTH (x));
796 g_cells[VECTOR (x)+g_cells[i].value] = g_cells[vector_entry (e)];
797 return cell_unspecified;
801 list_to_vector (SCM x)
803 VALUE (tmp_num) = VALUE (length (x));
804 SCM v = make_vector (tmp_num);
806 while (x != cell_nil)
808 g_cells[p++] = g_cells[vector_entry (car (x))];
818 return getc (g_stdin);
824 return ungetc (c, g_stdin);
838 return make_number (peekchar ());
844 return make_number (getchar ());
850 ungetchar (VALUE (i));
855 write_char (SCM x) ///((arity . n))
860 if (TYPE (p) == PAIR && TYPE (car (p)) == NUMBER) fd = VALUE (car (p));
861 FILE *f = fd == 1 ? stdout : stderr;
862 assert (TYPE (c) == NUMBER || TYPE (c) == CHAR);
863 fputc (VALUE (c), f);
868 symbol_to_list (SCM x)
870 assert (TYPE (x) == SYMBOL);
875 char_to_integer (SCM x)
877 assert (TYPE (x) == CHAR);
878 return make_number (VALUE (x));
882 integer_to_char (SCM x)
884 assert (TYPE (x) == NUMBER);
885 return make_char (VALUE (x));
889 make_tmps (scm* cells)
891 tmp = g_free.value++;
892 cells[tmp].type = CHAR;
893 tmp_num = g_free.value++;
894 cells[tmp_num].type = NUMBER;
895 tmp_num2 = g_free.value++;
896 cells[tmp_num2].type = NUMBER;
897 tmp_num3 = g_free.value++;
898 cells[tmp_num3].type = NUMBER;
899 tmp_num4 = g_free.value++;
900 cells[tmp_num4].type = NUMBER;
905 bool g_debug = false;
911 void *p = realloc (g_cells-1, 2*ARENA_SIZE*sizeof(scm));
914 if (g_debug) fprintf (stderr, "cannot up arena: %s: arena=%d\n", strerror (errno), 2*ARENA_SIZE);
915 return cell_unspecified;
925 if (g_debug) fprintf (stderr, "***gc[%d]...", g_free.value);
927 if (g_cells < g_news && ARENA_SIZE < MAX_ARENA_SIZE) gc_up_arena ();
928 for (int i=g_free.value; i<g_symbol_max; i++)
931 g_symbols = gc_copy (g_symbols);
932 SCM new = gc_copy (stack);
933 if (g_debug) fprintf (stderr, "new=%d\n", new, stack);
941 while (scan < g_free.value)
943 if (NTYPE (scan) == KEYWORD
944 || NTYPE (scan) == MACRO
945 || NTYPE (scan) == PAIR
946 || NTYPE (scan) == REF
948 || NTYPE (scan) == SPECIAL
949 || NTYPE (scan) == STRING
950 || NTYPE (scan) == SYMBOL)
952 SCM car = gc_copy (g_news[scan].car);
953 gc_relocate_car (scan, car);
955 if ((NTYPE (scan) == MACRO
956 || NTYPE (scan) == PAIR
957 || NTYPE (scan) == VALUES)
958 && g_news[scan].cdr) // allow for 0 terminated list of symbols
960 SCM cdr = gc_copy (g_news[scan].cdr);
961 gc_relocate_cdr (scan, cdr);
971 if (TYPE (old) == BROKEN_HEART) return g_cells[old].car;
972 SCM new = g_free.value++;
973 g_news[new] = g_cells[old];
974 if (NTYPE (new) == VECTOR)
976 g_news[new].vector = g_free.value;
977 for (int i=0; i<LENGTH (old); i++)
978 g_news[g_free.value++] = g_cells[VECTOR (old)+i];
980 g_cells[old].type = BROKEN_HEART;
981 g_cells[old].car = new;
986 gc_relocate_car (SCM new, SCM car)
988 g_news[new].car = car;
989 return cell_unspecified;
993 gc_relocate_cdr (SCM new, SCM cdr)
995 g_news[new].cdr = cdr;
996 return cell_unspecified;
1002 scm *cells = g_cells;
1005 if (g_debug) fprintf (stderr, " => jam[%d]\n", g_free.value);
1012 fprintf (stderr, "cells: ");
1014 display_ (stderr, -1);
1015 fprintf (stderr, "\n");
1018 fprintf (stderr, "news: ");
1020 display_ (stderr, -1);
1021 fprintf (stderr, "\n");
1024 return cell_unspecified;
1027 //
\f Environment setup
1029 acons (SCM key, SCM value, SCM alist)
1031 return cons (cons (key, value), alist);
1035 add_environment (SCM a, char const *name, SCM x)
1037 return acons (make_symbol (cstring_to_list (name)), x, a);
1043 g_cells = (scm *)malloc (2*ARENA_SIZE*sizeof(scm));
1044 g_cells[0].type = VECTOR;
1045 g_cells[0].length = 1000;
1046 g_cells[0].vector = 0;
1048 g_cells[0].type = CHAR;
1049 g_cells[0].value = 'c';
1055 g_news = g_cells-1 + ARENA_SIZE;
1056 g_news[0].type = VECTOR;
1057 g_news[0].length = 1000;
1058 g_news[0].vector = 0;
1060 g_news[0].type = CHAR;
1061 g_news[0].value = 'n';
1065 mes_symbols () ///((internal))
1070 #include "mes.symbols.i"
1072 g_symbol_max = g_free.value;
1073 make_tmps (g_cells);
1076 for (int i=1; i<g_symbol_max; i++)
1077 g_symbols = cons (i, g_symbols);
1082 a = acons (cell_symbol_label, cell_t, a);
1084 a = acons (cell_symbol_begin, cell_begin, a);
1085 a = add_environment (a, "sc-expand", cell_f);
1086 a = acons (cell_closure, a, a);
1088 internal_lookup_symbol (cell_nil);
1094 mes_builtins (SCM a)
1098 #include "display.i"
1106 #include "display.environment.i"
1107 #include "lib.environment.i"
1108 #include "math.environment.i"
1109 #include "mes.environment.i"
1110 #include "posix.environment.i"
1111 #include "reader.environment.i"
1112 #include "string.environment.i"
1113 #include "type.environment.i"
1115 a = add_environment (a, "*dot*", cell_dot);
1116 a = add_environment (a, "*foo-bar-baz*", cell_nil); // FIXME: some off-by one?
1122 mes_stack (SCM a) ///((internal))
1128 stack = cons (cell_nil, cell_nil);
1133 mes_environment () ///((internal))
1135 SCM a = mes_symbols ();
1136 return mes_stack (a);
1140 make_lambda (SCM args, SCM body)
1142 return cons (cell_symbol_lambda, cons (args, body));
1146 make_closure (SCM args, SCM body, SCM a)
1148 return cons (cell_closure, cons (cons (cell_circular, a), cons (args, body)));
1152 lookup_macro (SCM x, SCM a)
1154 if (TYPE (x) != SYMBOL) return cell_f;
1155 SCM m = assq_ref_cache (x, a);
1156 if (macro_p (m) == cell_t) return MACRO (m);
1161 read_input_file_env_ (SCM e, SCM a)
1163 if (e == cell_nil) return e;
1164 return cons (e, read_input_file_env_ (read_env (a), a));
1168 read_input_file_env (SCM a)
1172 return read_input_file_env_ (read_env (r0), r0);
1174 return apply_env (cell_symbol_read_input_file, cell_nil, r0);
1178 load_env (SCM a) ///((internal))
1182 g_stdin = fopen ("module/mes/read-0.mes", "r");
1183 g_stdin = g_stdin ? g_stdin : fopen (PREFIX "module/mes/read-0.mes", "r");
1185 if (!g_function) r0 = mes_builtins (r0);
1186 r3 = read_input_file_env (r0);
1192 bload_env (SCM a) ///((internal))
1194 g_stdin = fopen ("module/mes/read-0.mo", "r");
1195 g_stdin = g_stdin ? g_stdin : fopen (PREFIX "module/mes/read-0.mo", "r");
1196 char *p = (char*)g_cells;
1197 assert (getchar () == 'M');
1198 assert (getchar () == 'E');
1199 assert (getchar () == 'S');
1200 stack = getchar () << 8;
1201 stack += getchar ();
1208 g_free.value = (p-(char*)g_cells) / sizeof (scm);
1213 r0 = mes_builtins (r0);
1221 SCM frame = cons (r1, cons (r2, cons (r3, cons (r0, cell_nil))));
1222 stack = cons (frame, stack);
1225 char *p = (char*)g_cells;
1226 fputc ('M', stdout);
1227 fputc ('E', stdout);
1228 fputc ('S', stdout);
1229 fputc (stack >> 8, stdout);
1230 fputc (stack % 256, stdout);
1231 for (int i=0; i<g_free.value * sizeof(scm); i++)
1232 fputc (*p++, stdout);
1237 #include "display.c"
1245 main (int argc, char *argv[])
1247 g_debug = getenv ("MES_DEBUG");
1248 if (getenv ("MES_ARENA")) ARENA_SIZE = atoi (getenv ("MES_ARENA"));
1249 if (argc > 1 && !strcmp (argv[1], "--help")) return puts ("Usage: mes < FILE\n");
1250 if (argc > 1 && !strcmp (argv[1], "--version")) return puts ("Mes 0.3\n");
1252 r0 = mes_environment ();
1253 SCM program = (argc > 1 && !strcmp (argv[1], "--load"))
1254 ? bload_env (r0) : load_env (r0);
1255 if (argc > 1 && !strcmp (argv[1], "--dump")) return dump ();
1256 display_ (stderr, begin_env (program, r0));
1259 if (g_debug) fprintf (stderr, "\nstats: [%d]\n", g_free.value);