This repository has been archived by the owner on Jul 12, 2023. It is now read-only.
-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathbfmacro.pl
1312 lines (1227 loc) · 39.5 KB
/
bfmacro.pl
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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#! /usr/bin/perl
# macro translator for bf
# by Alva L. Couch,
# Associate Prof. of Computer Science
# Tufts University
# base macro language designed by Frans Faase,
# (http://http://home.planet.nl/~faase009/Ha_BF.html)
# Copyright (C) 2005 by Alva L. Couch
#
# This file is part of Bfmacro
#
# Bfmacro is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# Bfmacro is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU CC; see the file COPYING. If not, write to
# the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
# bfmacro synopsis:
# input: modification of Frans Fasse's bf macro language
# output: macro expansion commented with which macros are being expanded
# usage: bfmacro [options] file1.bfm file2.bfm ... > file.bf
# -dump or -d: dump all definitions in human-readable form, as comments
# in the output file.
# -nofaase or -nf: don't preload Frans Faase's macro set
# -noannotate or -na: don't annotate code with comments describing
# macro boundaries; instead, prettyprint the output code.
# note: when executed on a bf file rather than a bfm file,
# bfmacro file.bf # removes all whitespace from the file.
# bfmacro -na file.bf # prettyprints it.
# supported syntax:
# builtins
# to(X) ! seek constant location X, wherever that is
# at(X) ! re-anchor data pointer at X, assume it is there now.
# ! this is necessary after any unbalanced loop (e.g., [<])
# ! before the next call to to(). If no loops are unbalanced,
# ! at(X) is unnecessary to use.
# plus(X) ! add X +'s to output : called constant in Faase's language.
# minus(X) ! add X -'s to output : couch extension.
# right(X) ! add X >'s to output : couch extension.
# left(X) ! add X <'s to output : couch extension.
# macro definition:
# mac(X,T) = definition including other macros ;
# couch modification: require ';' to close definition.
# constant definition
# X=16; ! set X to refer to data[16]; undefined X's set automatically
# ! to non-conflicting data cells.
# couch modification: require ';' to close definition.
# values of arguments:
# X ! a defined constant
# 'A' ! an ascii value : couch extension.
# 24 ! a decimal value
# 0xaf ! a hex value
# macro expansion
# mac(W,Y) ! without following =, expands macro as token
# comments
# ! this is a comment
# arguments to macros are interpreted as integers that
# identify unique cells in bf memory; mapping between variables
# and memory locations is maintained by the macro-assembler.
# (constant locations are assigned starting at data[1] with addresses
# that increase in the order that variables are first mentioned)
# syntax not supported:
# - X+n = location n away from X
# to be done:
# - integer expressions in variable assignments and arguments.
# - documentation of macro preconditions and postconditions
# (ideally self-reflexive)
# - pragmas to assert post-conditions:
# pragma reserve 2,39; : reserve locations 2-39, don't bind to
# other variables (tunes auto-binding of to() arguments)
# - autobinding only of values that are used as 'to' arguments
# - meta-macros: take code blocks as arguments
# repeat(times, block) : repeat a code block 'times' times.
# while( {block}, {block} ) : while block is true, do block
# for ({block},{block},{block},{block})
# - simple optimization: omit [-] first time at cell, omit >< and <>.
# - improved scoping of to: currently [ to(X) > ] compiles and produces
# incorrect result; should make this an error and require
# [ at(X) to(Y) > ] instead
use strict;
use Data::Dumper;
#----------------
# option processing
#----------------
$main::opt_dump = &FALSE;
$main::opt_annotate = &TRUE;
$main::opt_faase = &TRUE;
for (my $i=0; $i<@ARGV; ) {
if ($ARGV[$i] eq '-dump' or $ARGV[$i] eq '-d') {
$main::opt_dump=&TRUE;
splice(@ARGV,$i,1);
} elsif ($ARGV[$i] eq '-noannotate' or $ARGV[$i] eq '-na') {
$main::opt_annotate=&FALSE;
splice(@ARGV,$i,1);
} elsif ($ARGV[$i] eq '-nofaase' or $ARGV[$i] eq '-nf') {
$main::opt_faase=&FALSE;
splice(@ARGV,$i,1);
} elsif ($ARGV[$i] eq '-help' or $ARGV[$i] eq '-h') {
print STDERR "bfmacro usage: bfmacro [-dump] input.bfm >output.bf\n";
print STDERR " -dump or -d: dump all definitions into output as comments\n";
print STDERR " -noannotate or -na: don't add comments explaining expansions\n";
print STDERR " -nofaase or -nf: do not preload Faase's macro set\n";
print STDERR " -help or -h: provide help on usage\n";
exit(1);
} else {
$i++;
}
}
# initialize parser variables
my %builtins=('to'=>1,'at'=>1,'plus'=>1,'minus'=>1,'left'=>1,'right'=>1);
my %bindings = (); # name to value
my %bound = (); # value to name
my $count=1;
my @tokens = ();
#----------------
# read predefined macros
#----------------
if ($main::opt_faase) {
my @frans;
while (<DATA>) { push(@frans, $_); }
my $frans = join('',@frans);
&tokenizer($frans,&FALSE);
}
#----------------
# read all files on command line
#----------------
foreach my $f (@ARGV) {
open(FILE, "<$f") or die "can't read $f: $!";
my @input = (<FILE>); # read all input
close(FILE);
my $input = join('',@input);
&tokenizer($input,&TRUE);
}
#----------------
# tokenizer: do word-level and comment-level parsing;
# discard invalid inputs
#----------------
sub tokenizer {
my $input = shift;
my $comment = shift;
my $context = '';
my $inparen=0;
while ($input ne '') {
if (! $inparen) {
if ($input =~ s/^([\s\n]+)// ) {
$context .= $1;
} elsif ($input =~ s/^([a-zA-Z_][a-zA-Z0-9_]*)//) {
push(@tokens,new token('macro',$1,$1,
&contextBefore($context),
&contextAfter($input))); $context .= $1;
} elsif ($input =~ s/^(0x[0-9a-fA-F][0-9a-fA-F]*)//) {
my $hex = $1; my $val = eval($hex);
push(@tokens,new token('num',$hex,$val,
&contextBefore($context),
&contextAfter($input))); $context .= $1;
} elsif ($input =~ s/^([1-9][0-9]*|0)//) {
push(@tokens,new token('num',$1,$1,
&contextBefore($context),
&contextAfter($input))); $context .= $1;
} elsif ($input =~ s/^('[ -~]')//) {
my $char = $1; $char =~ s/^'//; $char =~ s/'$//;
push(@tokens,new token('num',$char,ord($char),
&contextBefore($context),
&contextAfter($input))); $context .= $1;
} elsif ($input =~ s/^([-+,.<>\[\]])//) {
push(@tokens,new token('opcode',$1,$1,
&contextBefore($context),
&contextAfter($input))); $context .= $1;
} elsif ($input =~ s/^(!.*)//) {
push(@tokens,new token('comment',$1,$1,
&contextBefore($context),
&contextAfter($input)))
if $comment;
$context .= $1;
} elsif ($input =~ s/^(\()//) {
push(@tokens,new token('lparen',$1,$1,
&contextBefore($context),
&contextAfter($input))); $context .= $1;
$inparen=1;
} elsif ($input =~ s/^(=)//) {
push(@tokens,new token('begindef',$1,$1,
&contextBefore($context),
&contextAfter($input))); $context .= $1;
} elsif ($input =~ s/^(;)//) {
push(@tokens,new token('enddefin',$1,$1,
&contextBefore($context),
&contextAfter($input))); $context .= $1;
} elsif ($input =~ s/^(.)//) {
print STDERR "unknown character $1 in input!\n";
print STDERR &context($context,$1,$input) . "\n";
$context .= $1;
} else {
print STDERR "no match for '$input'; tokenizer error!\n";
exit(1);
}
} else {
if ($input =~ s/^([\s\n,]+)// ) {
# eat commas as well as whitespace
$context .= $1;
} elsif ($input =~ s/^([a-zA-Z_][a-zA-Z0-9_]*)//) {
push(@tokens,new token('var',$1,$1,
&contextBefore($context),
&contextAfter($input))); $context .= $1;
} elsif ($input =~ s/^(0x[0-9a-fA-F][0-9a-fA-F]*)//) {
my $hex = $1; my $val = eval($hex);
push(@tokens,new token('num',$hex,$val,
&contextBefore($context),
&contextAfter($input))); $context .= $1;
} elsif ($input =~ s/^([1-9][0-9]*|0)//) {
push(@tokens,new token('num',$1,$1,
&contextBefore($context),
&contextAfter($input))); $context .= $1;
} elsif ($input =~ s/^('[ -~]')//) {
my $char = $1; $char =~ s/^'//; $char =~ s/'$//;
push(@tokens,new token('num',"'$char'",ord($char),
&contextBefore($context),
&contextAfter($input))); $context .= $1;
} elsif ($input =~ s/^(!.*)//) {
push(@tokens,new token('comment',$1,$1,
&contextBefore($context),
&contextAfter($input)))
if $comment;
$context .= $1;
} elsif ($input =~ s/^(\))//) {
push(@tokens,new token('rparen',$1,$1,
&contextBefore($context),
&contextAfter($input))); $context .= $1;
$inparen=0;
} elsif ($input =~ s/^(.)//) {
print STDERR "unknown character $1 in input\n";
print STDERR &context($context,$1,$input) . "\n";
$context .= $1;
} else {
print STDERR "no match for '$input'; tokenizer error!\n";
exit(1);
}
}
}
}
#----------------
# reduction: collect arguments for macros; file macros separately!
#----------------
my $currentmac = undef;
my $errors = undef;
our %macros = ();
for (my $i=0; $i<@tokens; ) {
if ($tokens[$i]->name eq 'macro') {
my $macro = $tokens[$i];
my $name = $macro->string;
my $varspace = []; $macro->vars=$varspace;
$i++;
if ($tokens[$i]->name eq 'lparen') {
# remove '('
splice (@tokens,$i,1);
# parse out variable names
while ($tokens[$i]->name eq 'var'
|| $tokens[$i]->name eq 'num'
|| $tokens[$i]->name eq 'comment') {
push(@$varspace,splice(@tokens,$i,1))
if $tokens[$i]->name eq 'var'
|| $tokens[$i]->name eq 'num';
}
# check for ')'
if ($tokens[$i]->name ne 'rparen') {
print STDERR "macro $name must end with ')'\n";
print STDERR &obcontext($tokens[$i]) . "\n";
$errors++;
last;
}
# remove ')'
splice(@tokens,$i,1);
$i--; # at macro
if (defined $currentmac) {
push(@$currentmac,splice(@tokens,$i,1));
} else { $i++; }
} elsif ($tokens[$i]->name eq 'begindef') {
$i--;
my $name = $tokens[$i]->string;
splice(@tokens,$i,1); # remove name
splice(@tokens,$i,1); # remove =
if ($tokens[$i]->name ne 'num') {
print STDERR "Assignment '$name=' not followed by a number"
." (".$tokens[$i]->name.")\n";
print STDERR &obcontext($tokens[$i]) . "\n";
$errors++;
last;
}
my $val = $tokens[$i]->value;
$bindings{$name} = $val; # name->value
$bound{$val} = $name; # loc->name
splice(@tokens,$i,1); # remove number
if ($tokens[$i]->name ne 'enddefin') {
print STDERR "Assignment of '$name' not followed by a ';'\n";
print STDERR &obcontext($tokens[$i]) . "\n";
$errors++;
last;
}
splice(@tokens,$i,1); # remove ';'
} else {
print STDERR "macro '$name' not followed by '(' or '='\n";
print STDERR &obcontext($tokens[$i]) . "\n";
$errors++;
last;
}
} elsif ($tokens[$i]->name eq 'begindef') { # define macro
if ($i>0 && $tokens[$i-1]->name eq 'macro') {
splice(@tokens,$i,1); # remove begindef
if (defined $currentmac) {
$errors++;
print STDERR "definition inside definition!\n";
print STDERR &obcontext($tokens[$i]) . "\n";
last;
}
$currentmac = [];
$i--; # to macro definition
$tokens[$i]->defn=$currentmac;
my $name = $tokens[$i]->string;
if ($builtins{$name}) {
print STDERR "attempt to redefine builtin function '$name'!\n";
print STDERR &obcontext($tokens[$i]) . "\n";
last;
} elsif (! defined $macros{$name}) {
$macros{$name} = splice(@tokens,$i,1);
} else {
print STDERR "attempt to redefine macro '$name'!\n";
print STDERR &obcontext($tokens[$i]) . "\n";
last;
}
} else {
$errors++;
print STDERR "attempt to define non-macro!\n";
print STDERR &obcontext($tokens[$i]) . "\n";
last;
}
} elsif ($tokens[$i]->name eq 'enddefin') {
if (! defined $currentmac) {
$errors++;
print STDERR "end of definition not related to definition!\n";
print STDERR &obcontext($tokens[$i]) . "\n";
last;
}
$currentmac = undef;
splice(@tokens,$i,1);
} else { # other terms
if (defined $currentmac) {
push(@$currentmac,splice(@tokens,$i,1));
} else { $i++; }
}
}
if (defined $currentmac) {
print STDERR "end of text during macro\n";
$errors++;
}
if ($errors) {
print STDERR "errors encountered! exiting.\n";
exit(1);
}
#----------------
# check macros for binding anomalies
# including wrong number of arguments
# or unused or undeclared arguments
#----------------
my @macros = sort keys %macros;
foreach my $m (@macros) {
my $desc = $macros{$m};
my $vars = $desc->vars; my %vars = ();
foreach my $v (@$vars) {
if ($v->name ne 'var') {
print STDERR "cannot use non-vars '".$v->string
."' as macro arguments!\n";
print STDERR &obcontext($v) . "\n";
$errors++;
}
$vars{$v->string}++;
}
# read variable use in macros, flag all USED variables.
my $exps = $desc->defn; my %exps = ();
foreach my $e (@$exps) {
if ($e->name eq 'macro') {
my $v2s = $e->vars;
foreach my $v (@$v2s) {
if ($v->name eq 'var') { $exps{$v->string}++; }
}
}
}
foreach my $k (sort keys %vars) {
if (! $exps{$k}) {
print STDERR "macro ".$desc->string.": argument $k unused\n";
print STDERR &obcontext($desc) . "\n";
$errors++;
}
}
# may want these to default to global scope!
foreach my $k (sort keys %exps) {
if (! $vars{$k}) {
print STDERR "macro $desc->string: unspecified argument $k\n";
print STDERR &obcontext($desc) . "\n";
$errors++;
}
}
}
if ($errors) {
print STDERR "errors encountered! exiting.\n";
exit(1);
}
#----------------
# print macro set in comments for documentation
#----------------
if ($main::opt_dump) {
print "! ===== macros: =====\n";
foreach my $s (sort keys %macros) {
print " ! ". &textit($macros{$s}); print "\n";
}
print "! ===== tokens: =====\n";
foreach my $t (@tokens) {
if ($t->name eq 'macro' || $t->name eq 'opcode') {
print " ! " . &textit($t) . "\n";
}
}
}
#----------------
# trace usage of builtins, including 'to'
#----------------
my $usage = {};
&trace_usage;
foreach my $u (sort keys %$usage) {
if (! defined $bindings{$u}) { # and $usage->{$u}->{'to'})
while (defined $bound{$count}) { $count++; }
$bound{$count} = $u;
$bindings{$u} = $count++;
}
}
#----------------
# check for invocation anomalies among tokens,
# including wrong number of arguments and type botches
#----------------
foreach my $t (@tokens) {
&check_token($t);
}
if ($errors) {
print STDERR "errors encountered! exiting.\n";
exit(1);
}
#----------------
# check for invocation anomalies among macros,
# including wrong number of arguments
#----------------
my $key; my $value;
while (($key,$value) = each %macros) { # for each macro
foreach my $t (@{$value->defn}) { # for each definition
&check_token($t);
}
}
if ($errors) {
print STDERR "errors encountered! exiting.\n";
exit(1);
}
if ($main::opt_annotate) {
print "! ===== bindings: ====\n";
foreach my $t (sort keys %bindings) { print " ! $t=$bindings{$t};\n"; }
print "! ===== code begins ==\n";
}
#----------------
# with variable bindings in hand, and principle of invariance,
# generate BF code matching macro definitions. This is a
# single pass recursive substitution in which macros are expanded
# all the way to terminals.
#----------------
my $output = &generate;
if ($errors) {
print STDERR "errors detected. Shutting down.\n";
exit(1);
}
#----------------
# done! print result!
#----------------
print $output . "\n";
#----------------
# text handling
#----------------
# create a text representation of a token data structure
sub textit {
my $thing = shift;
my $out = '';
if ($thing->name eq 'macro') {
$out .= $thing->string;
$out .= "(";
if (defined $thing->vars) {
my $first = 1;
foreach my $t (@{$thing->vars}) {
if ($first) { $first=undef; } else { $out .= ","; }
$out .= $t->string;
}
$out .= ")";
}
if (defined $thing->defn) {
$out .= " = ";
foreach my $t (@{$thing->defn}) {
$out .= &textit($t);
}
$out .= ";";
}
} elsif ($thing->name eq 'opcode') {
$out .= $thing->string;
}
return $out;
}
# annotate a syntax tree with its labelling
sub annotateit {
my $thing = shift;
my $out = '';
if ($thing->name eq 'macro') {
my $name = $thing->name;
my $string = $thing->string;
$out .= "\n$name:$string";
$out .= "(";
if (defined $thing->vars) {
my $first = 1;
foreach my $t (@{$thing->vars}) {
if ($first) { $first=undef; } else { $out .= ","; }
my $name = $t->name;
my $string = $t->string;
$out .= "$name:$string";
}
$out .= ")";
}
if (defined $thing->defn) {
$out .= " = ";
foreach my $t (@{$thing->defn}) {
$out .= &annotateit($t);
}
$out .= ";";
}
} elsif ($thing->name eq 'opcode') {
$out .= $thing->string;
}
return $out;
}
#----------------
# debugging context printing
#----------------
# very expensive routine to print context
# surrounding an error. Not for large programs!
sub context {
my $before = shift;
my $now = shift;
my $after = shift;
my $lines = shift;
my $out = &contextBefore($before,$lines)
. '**here**>' . $now . '<**here**'
. &contextAfter($after,$lines) ;
return $out;
}
# compute 3 lines of context before a bug
sub contextBefore {
my $before = shift;
my $lines = shift;
$lines = 3 if ! defined $lines;
my @before = split(/\n/,$before);
splice(@before,0,@before-$lines);
return join("\n",@before);
}
# compute three lines of context after a token
sub contextAfter {
my $after = shift;
my $lines = shift;
$lines = 3 if ! defined $lines;
my @after = split(/\n/,$after);
splice(@after,$lines);
return join("\n",@after);
}
# construct a message about context
sub obcontext {
my $ob = shift;
my $lines = shift;
return $ob->before
. "**here**>" . $ob->string . "<**here**"
. $ob->after;
}
#----------------
# generate code from token stream
#----------------
sub generate {
$main::d = 0;
$main::invariant = &TRUE;
$main::depth = 0;
my $output = '';
@main::nest = (); # whether current level is nested
@main::stack = ();
$main::depth = 0;
for (my $i=0; $i<@tokens; $i++) {
if ($tokens[$i]->name eq 'macro') {
$output .= "\n" if &needsCr($output) and $main::opt_annotate;
$output .= &interpret($tokens[$i]);
} elsif ($tokens[$i]->name eq 'opcode') {
if (!$main::opt_annotate && ! &needsCr($output)) {
for (my $i=0; $i<$main::depth; $i++) { $output .= " "; }
}
my $code = $tokens[$i]->string;
if ($code eq '<') { $main::d--; }
elsif ($code eq '>') { $main::d++; }
elsif ($code eq '[') {
$main::nested[$#main::nested]=1 if @main::nested;
push(@main::nested,0);
push(@main::stack,$main::d);
if (! $main::opt_annotate) {
$output .= "\n" if &needsCr($output);
for (my $i=0; $i<$main::depth; $i++) { $output .= " "; }
$main::depth++;
}
}
elsif ($code eq ']') {
my $nest = pop(@main::nested);
my $d2 = pop(@main::stack);
if ($d2 != $main::d) {
$main::invariant = &FALSE;
}
if (! $main::opt_annotate) {
$main::depth--;
if ($nest) {
$output .= "\n" if &needsCr($output);
for (my $i=0; $i<$main::depth; $i++) { $output .= " "; }
}
}
}
$output .= $code;
} elsif ($tokens[$i]->name eq 'comment') {
$output .= "\n" if &needsCr($output);
$output .= $tokens[$i]->string . "\n";
}
}
return $output;
}
#----------------
# interpret a macro recursively; expand to terminals
#----------------
sub interpret {
my $macro = shift;
# my $main::depth = shift;
my $name = $macro->string;
my $vars = $macro->vars;
my $out = '';
if ($main::opt_annotate) {
# $out .= "\n" if &needsCr($out);
for (my $i=0; $i<$main::depth; $i++) { $out .= ' '; }
$out .= "! " . &textit($macro) . "\n";
}
# my $tokens = undef;
if ($name eq 'to') {
if (! $main::invariant) {
print STDERR "'to' encountered without positional invariance!\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
return;
}
my $var = $vars->[0]; # first variable wins
if (! defined $var) {
print STDERR "to: no variable to seek!\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
}
my $loc;
if ($var->name eq 'var') {
my $vname = $var->string;
$loc = $bindings{$vname};
} elsif ($var->name eq 'num') {
$loc = $var->value;
} else {
print STDERR "invalid operand type for 'to': ".$var->name."\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
return;
}
if ($main::d != $loc) {
if ($main::opt_annotate) {
$out .= "\n" if &needsCr($out);
for (my $i=0; $i<$main::depth+1; $i++) { $out .= ' '; }
} else {
for (my $i=0; $i<$main::depth; $i++) { $output .= " "; }
}
while ($main::d>$loc) { $out .= '<'; $main::d--; }
while ($main::d<$loc) { $out .= '>'; $main::d++; }
if ($main::opt_annotate) {
$out .= "\n";
}
}
} elsif ($name eq 'at') {
my $var = $vars->[0]; # first variable wins
if (! defined $var) {
print STDERR "at: no position to assert!\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
}
my $loc;
if ($var->name eq 'var') {
my $vname = $var->string;
$loc = $bindings{$vname};
} elsif ($var->name eq 'num') {
$loc = $var->value;
} else {
print STDERR "invalid operand type for 'to': ".$var->name."\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
return;
}
$main::d = $loc; $main::invariant = &TRUE; # now invariance assumption holds
if ($main::opt_annotate) {
$out .= "\n" if &needsCr($out);
for (my $i=0; $i<$main::depth+1; $i++) { $out .= ' '; }
$out .= "! assert data pointer = $loc\n";
$out .= "\n";
}
} elsif ($name eq 'plus') {
my $var = $vars->[0]; # first variable wins
if (! defined $var) {
print STDERR "'plus': no value to add!\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
return;
}
my $loc;
if ($var->name eq 'var') {
my $vname = $var->string;
$loc = $bindings{$vname};
} elsif ($var->name eq 'num') {
$loc = $var->value;
} else {
print STDERR "invalid operand type for 'plus': ".$var->name."\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
}
if ($loc>0) {
if ($main::opt_annotate) {
for (my $i=0; $i<$main::depth+1; $i++) { $out .= ' '; }
}
if (!$main::opt_annotate && ! &needsCr($output)) {
for (my $i=0; $i<$main::depth; $i++) { $output .= " "; }
}
for (my $i=0; $i<$loc; $i++) { $out .= '+'; }
if ($main::opt_annotate) {
$out .= "\n";
}
}
} elsif ($name eq 'minus') {
my $var = $vars->[0]; # first variable wins
if (! defined $var) {
print STDERR "'minus': no value to subtract!\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
}
my $loc;
if ($var->name eq 'var') {
my $vname = $var->string;
$loc = $bindings{$vname};
} elsif ($var->name eq 'num') {
$loc = $var->value;
} else {
print STDERR "invalid operand type for 'minus': ".$var->name."\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
}
if ($loc>0) {
if ($main::opt_annotate) {
$out .= "\n" if &needsCr($out);
for (my $i=0; $i<$main::depth+1; $i++) { $out .= ' '; }
}
if (!$main::opt_annotate && ! &needsCr($output)) {
for (my $i=0; $i<$main::depth; $i++) { $output .= " "; }
}
for (my $i=0; $i<$loc; $i++) { $out .= '-'; }
if ($main::opt_annotate) {
$out .= "\n";
}
}
} elsif ($name eq 'left') {
my $var = $vars->[0]; # first variable wins
if (! defined $var) {
print STDERR "'left': no value to subtract!\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
}
my $loc;
if ($var->name eq 'var') {
my $vname = $var->string;
$loc = $bindings{$vname};
} elsif ($var->name eq 'num') {
$loc = $var->value;
} else {
print STDERR "invalid operand type for 'left': ".$var->name."\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
}
if ($loc>0) {
if ($main::opt_annotate) {
$out .= "\n" if &needsCr($out);
for (my $i=0; $i<$main::depth+1; $i++) { $out .= ' '; }
}
if (!$main::opt_annotate && ! &needsCr($output)) {
for (my $i=0; $i<$main::depth; $i++) { $output .= " "; }
}
for (my $i=0; $i<$loc; $i++) { $out .= '<'; $main::d--; }
if ($main::opt_annotate) {
$out .= "\n";
}
}
} elsif ($name eq 'right') {
my $var = $vars->[0]; # first variable wins
if (! defined $var) {
print STDERR "'right': no value to subtract!\n";
$errors++;
}
my $loc;
if ($var->name eq 'var') {
my $vname = $var->string;
$loc = $bindings{$vname};
} elsif ($var->name eq 'num') {
$loc = $var->value;
} else {
print STDERR "invalid operand type for 'right': ".$var->name."\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
}
if ($loc>0) {
if ($main::opt_annotate) {
$out .= "\n" if &needsCr($out);
for (my $i=0; $i<$main::depth+1; $i++) { $out .= ' '; }
}
if (!$main::opt_annotate && ! &needsCr($output)) {
for (my $i=0; $i<$main::depth; $i++) { $output .= " "; }
}
for (my $i=0; $i<$loc; $i++) { $out .= '>'; $main::d++; }
if ($main::opt_annotate) {
$out .= "\n";
}
}
} else {
my $match = $macros{$name};
if (! defined $match) {
print STDERR "macro $name not defined!\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
return '';
}
my $mvars = $match->vars;
if (scalar(@$mvars) != scalar(@$vars)) {
print STDERR "macro argument count incorrect!\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
return '';
}
my %map = ();
for (my $i=0; $i<@$vars; $i++) {
$map{$mvars->[$i]->string}=$vars->[$i];
}
# interpret macro by translating variables,
# and then recurse for further macros
my $mdef = $match->defn;
foreach my $m (@$mdef) {
if ($m->name eq 'opcode') {
if ($main::opt_annotate && ! &needsCr($out)) {
for (my $i=0; $i<($main::depth+1); $i++) { $out .= " "; }
}
my $code = $m->string;
if ($code eq '<') { $main::d--; }
elsif ($code eq '>') { $main::d++; }
elsif ($code eq '[') {
$main::nested[$#main::nested]=1 if @main::nested;
push(@main::nested,0);
push(@main::stack,$main::d);
if (! $main::opt_annotate) {
$out .= "\n" if &needsCr($out);
for (my $i=0; $i<$main::depth; $i++) { $out .= " "; }
$main::depth++;
}
}
elsif ($code eq ']') {
my $nest = pop(@main::nested);
my $d2 = pop(@main::stack);
if ($d2 != $main::d) {
$main::invariant = &FALSE;
}
if (! $main::opt_annotate) {
$main::depth--;
if ($nest) {
$out .= "\n" if &needsCr($out);
for (my $i=0; $i<$main::depth; $i++) { $out .= " "; }
}
}
}
$out .= $m->string;
} elsif ($m->name eq 'macro') {
my $mac = $m->copy;
my $var = []; $mac->vars=$var;
foreach my $v (@{$m->vars}) {
if ($v->name eq 'var') {
push(@$var, $map{$v->string}->copy);
} else {
push(@$var, [@$v]);
}
}
if ($main::opt_annotate) {
$out .= "\n" if &needsCr($out);
$main::depth++;
}
$out .=&interpret($mac);
if ($main::opt_annotate) {
$main::depth--;
}
}
}
}
$out .= "\n" if &needsCr($out) && $main::opt_annotate;
return $out;
}
#----------------
# do an ersatz macro expansion without generation,
# tracing which macros get which variable values.
#----------------
sub trace_usage {
for (my $i=0; $i<@tokens; $i++) {
if ($tokens[$i]->name eq 'macro') {
&trace_macro($tokens[$i]);
}
}
}
#----------------
# trace one macro and determine contained calls
#----------------
sub trace_macro {
my $macro = shift;
my $depth = shift;
my $name = $macro->string;
my $vars = $macro->vars;
if ($name eq 'to'
or $name eq 'at'
or $name eq 'plus'
or $name eq 'minus'
or $name eq 'left'
or $name eq 'right') {
my $var = $vars->[0]; # first variable wins
if (defined $var && $var->name eq 'var') {
$usage->{$var->string}->{$name}++;
}
} else {
my $match = $macros{$name};
if (! defined $match) {
print STDERR "macro $name not defined!\n";
print STDERR &obcontext($macro) . "\n";
$errors++;
return;
}
my $mvars = $match->vars;
if (scalar(@$mvars) != scalar(@$vars)) {
print STDERR "macro argument count incorrect!\n";
print STDERR &obcontext($macro) . "\n";