aboutsummaryrefslogtreecommitdiffstats
path: root/lcc/src/pass2.c
blob: 08d73cf18c25f62328260c376af00ada4b2fcd42 (plain)
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
#include "c.h"
#include "rcc.h"
#if WIN32
#include <fcntl.h>
#include <io.h>
#endif


Interface *IR = NULL;
int Aflag;		/* >= 0 if -A specified */
int Pflag;		/* != 0 if -P specified */
int glevel;		/* == [0-9] if -g[0-9] specified */
int xref;		/* != 0 for cross-reference data */
Symbol YYnull;		/* _YYnull  symbol if -n or -nvalidate specified */
Symbol YYcheck;		/* _YYcheck symbol if -nvalidate,check specified */

static int verbose = 1;
#define VERBOSE(n,arg) (verbose >= n ? (void)(arg):(void)0)
static int nuids;
static rcc_item_ty *items;
static void **itemmap;

static void *uid2type(int uid) {
	assert(uid >= 0 && uid < nuids);
	if (itemmap[uid] == NULL) {
		Type ty;
		rcc_type_ty type = (void *)items[uid];
		assert(items[uid]);
		assert(items[uid]->uid == uid);
		assert(items[uid]->kind == rcc_Type_enum);
		type = items[uid]->v.rcc_Type.type;
		assert(type);
		switch (type->kind) {
		case rcc_INT_enum:
			ty = btot(INT, type->size);
			assert(ty->align == type->align);
			break;
		case rcc_UNSIGNED_enum:
			ty = btot(UNSIGNED, type->size);
			assert(ty->align == type->align);
			break;
		case rcc_FLOAT_enum:
			ty = btot(FLOAT, type->size);
			assert(ty->align == type->align);
			break;
		case rcc_VOID_enum:
			ty = voidtype;
			break;
		case rcc_POINTER_enum:
			ty = ptr(uid2type(type->v.rcc_POINTER.type));
			break;
		case rcc_ARRAY_enum:
			ty = uid2type(type->v.rcc_ARRAY.type);
			assert(ty->size > 0);
			ty = array(ty, type->size/ty->size, 0);
			break;
		case rcc_CONST_enum:
			ty = qual(CONST, uid2type(type->v.rcc_CONST.type));
			break;
		case rcc_VOLATILE_enum:
			ty = qual(VOLATILE, uid2type(type->v.rcc_VOLATILE.type));
			break;
		case rcc_ENUM_enum: {
			int i, n = Seq_length(type->v.rcc_ENUM.ids);
			ty = newstruct(ENUM, string(type->v.rcc_ENUM.tag));
			ty->type = inttype;
			ty->size = ty->type->size;
			ty->align = ty->type->align;
			ty->u.sym->u.idlist = newarray(n + 1, sizeof *ty->u.sym->u.idlist, PERM);
			for (i = 0; i < n; i++) {
				rcc_enum__ty e = Seq_remlo(type->v.rcc_ENUM.ids);
				Symbol p = install(e->id, &identifiers, GLOBAL, PERM);
				p->type = ty;
				p->sclass = ENUM;
				p->u.value = e->value;
				ty->u.sym->u.idlist[i] = p;
				free(e);
			}
			ty->u.sym->u.idlist[i] = NULL;
			Seq_free(&type->v.rcc_ENUM.ids);
			break;
			}
		case rcc_STRUCT_enum: case rcc_UNION_enum: {
			int i, n;
			Field *tail;
			list_ty fields;
			if (type->kind == rcc_STRUCT_enum) {
				ty = newstruct(STRUCT, string(type->v.rcc_STRUCT.tag));
				fields = type->v.rcc_STRUCT.fields;
			} else {
				ty = newstruct(UNION, string(type->v.rcc_UNION.tag));
				fields = type->v.rcc_UNION.fields;
			}
			itemmap[uid] = ty;	/* recursive types */
			ty->size = type->size;
			ty->align = type->align;
			tail = &ty->u.sym->u.s.flist;
			n = Seq_length(fields);
			for (i = 0; i < n; i++) {
				rcc_field_ty field = Seq_remlo(fields);
				NEW0(*tail, PERM);
				(*tail)->name = (char *)field->id;
				(*tail)->type = uid2type(field->type);
				(*tail)->offset = field->offset;
				(*tail)->bitsize = field->bitsize;
				(*tail)->lsb = field->lsb;
				if (isconst((*tail)->type))
					ty->u.sym->u.s.cfields = 1;
				if (isvolatile((*tail)->type))
					ty->u.sym->u.s.vfields = 1;
				tail = &(*tail)->link;
				free(field);
			}
			Seq_free(&fields);
			break;
			}
		case rcc_FUNCTION_enum: {
			int n = Seq_length(type->v.rcc_FUNCTION.formals);
			if (n > 0) {
				int i;
				Type *proto = newarray(n + 1, sizeof *proto, PERM);
				for (i = 0; i < n; i++) {
					int *formal = Seq_remlo(type->v.rcc_FUNCTION.formals);
					proto[i] = uid2type(*formal);
					free(formal);
				}
				proto[i] = NULL;
				ty = func(uid2type(type->v.rcc_FUNCTION.type), proto, 0);
			} else
				ty = func(uid2type(type->v.rcc_FUNCTION.type), NULL, 1);
			Seq_free(&type->v.rcc_FUNCTION.formals);
			break;
			}
		default: assert(0);
		}
		if (itemmap[uid] == NULL) {
			itemmap[uid] = ty;
			free(type);
			free(items[uid]);
			items[uid] = NULL;
		} else
			assert(itemmap[uid] == ty);
	}
	return itemmap[uid];
}

static Symbol uid2symbol(int uid) {
	assert(uid >= 0 && uid < nuids);
	if (itemmap[uid] == NULL) {
		Symbol p;
		rcc_symbol_ty symbol;
		assert(items[uid]);
		assert(items[uid]->uid == uid);
		assert(items[uid]->kind == rcc_Symbol_enum);
		symbol = items[uid]->v.rcc_Symbol.symbol;
		assert(symbol);
		NEW0(p, PERM);
		p->name = (char *)symbol->id;
		p->scope = symbol->scope;
		p->sclass = symbol->sclass;
		p->type = uid2type(symbol->type);
#define xx(f,n) p->f = symbol->flags>>n;
		xx(structarg,0)
		xx(addressed,1)
		xx(computed,2)
		xx(temporary,3)
		xx(generated,4)
#undef xx
		p->ref = symbol->ref/10000.0;
		assert(p->scope != CONSTANTS && p->scope != LABELS);
		if (p->scope == GLOBAL || p->sclass == STATIC || p->sclass == EXTERN)
			(*IR->defsymbol)(p);
		itemmap[uid] = p;
		free(symbol);
		free(items[uid]);
		items[uid] = NULL;
	}
	return itemmap[uid];
}

#define xx(s) static void do##s(rcc_interface_ty);
xx(Export)
xx(Import)
xx(Global)
xx(Local)
xx(Address)
xx(Segment)
xx(Defaddress)
xx(Deflabel)
xx(Defconst)
xx(Defconstf)
xx(Defstring)
xx(Space)
xx(Function)
xx(Blockbeg)
xx(Blockend)
xx(Forest)
#undef xx
static void (*doX[])(rcc_interface_ty in) = {
#define xx(s) 0,
xx(Export)
xx(Import)
xx(Global)
xx(Local)
xx(Address)
xx(Segment)
xx(Defaddress)
xx(Deflabel)
xx(Defconst)
xx(Defconstf)
xx(Defstring)
xx(Space)
xx(Function)
xx(Blockbeg)
xx(Blockend)
xx(Forest)
	0
#undef xx
};

static void interface(rcc_interface_ty in) {
	assert(in);
	(*doX[in->kind])(in);
	free(in);
}

static void doExport(rcc_interface_ty in) {
	(*IR->export)(uid2symbol(in->v.rcc_Export.p));
}

static void doImport(rcc_interface_ty in) {
	Symbol p = uid2symbol(in->v.rcc_Export.p);

	(*IR->import)(p);
	p->defined = 1;
}

static void doGlobal(rcc_interface_ty in) {
	Symbol p = uid2symbol(in->v.rcc_Global.p);

	p->u.seg = in->v.rcc_Global.seg;
	(*IR->global)(p);
	p->defined = 1;
}

static void doLocal(rcc_interface_ty in) {
	int uid = in->v.rcc_Local.uid;

	assert(uid >= 0 && uid < nuids);
	assert(items[uid] == NULL);
	items[uid] = rcc_Symbol(uid, in->v.rcc_Local.p);
	if (in->v.rcc_Local.p->scope >= LOCAL)
		addlocal(uid2symbol(uid));
}

static void doAddress(rcc_interface_ty in) {
	int uid = in->v.rcc_Address.uid;
	Symbol p = uid2symbol(in->v.rcc_Address.p);

	assert(uid >= 0 && uid < nuids);
	assert(items[uid] == NULL);
	items[uid] = rcc_Symbol(uid, in->v.rcc_Address.q);
	if (p->scope == GLOBAL || p->sclass == STATIC || p->sclass == EXTERN)
		(*IR->address)(uid2symbol(uid), p, in->v.rcc_Address.n);
	else {
		Code cp = code(Address);
		cp->u.addr.sym = uid2symbol(uid);
		cp->u.addr.base = p;
		cp->u.addr.offset = in->v.rcc_Address.n;
	}
}

static void doSegment(rcc_interface_ty in) {
	(*IR->segment)(in->v.rcc_Segment.seg);
}

static void doDefaddress(rcc_interface_ty in) {
	(*IR->defaddress)(uid2symbol(in->v.rcc_Defaddress.p));
}

static void doDeflabel(rcc_interface_ty in) {
	(*IR->defaddress)(findlabel(in->v.rcc_Deflabel.label));
}

static void doDefconst(rcc_interface_ty in) {
	Value v;

	v.i = in->v.rcc_Defconst.value;
	(*IR->defconst)(in->v.rcc_Defconst.suffix, in->v.rcc_Defconst.size, v);
}

static void doDefconstf(rcc_interface_ty in) {
	Value v;
	unsigned *p = (unsigned *)&v.d;

	p[swap]   = in->v.rcc_Defconstf.value->msb;
	p[1-swap] = in->v.rcc_Defconstf.value->lsb;
	(*IR->defconst)(F, in->v.rcc_Defconstf.size, v);
	free(in->v.rcc_Defconstf.value);
}

static void doDefstring(rcc_interface_ty in) {
	(*IR->defstring)(in->v.rcc_Defstring.s.len, (char *)in->v.rcc_Defstring.s.str);
	free((char *)in->v.rcc_Defstring.s.str);
}

static void doSpace(rcc_interface_ty in) {
	(*IR->space)(in->v.rcc_Space.n);
}

static void doFunction(rcc_interface_ty in) {
	int i, n;
	Symbol *caller, *callee;

	/*
	 Initialize:
	  define the function symbol,
	  initialize callee and caller arrays.
	*/
	cfunc = uid2symbol(in->v.rcc_Function.f);
	labels = table(NULL, LABELS);
	enterscope();
	n = Seq_length(in->v.rcc_Function.caller);
	caller = newarray(n + 1, sizeof *caller, FUNC);
	for (i = 0; i < n; i++) {
		int *uid = Seq_remlo(in->v.rcc_Function.caller);
		caller[i] = uid2symbol(*uid);
		free(uid);
	}
	caller[i] = NULL;
	Seq_free(&in->v.rcc_Function.caller);
	callee = newarray(n + 1, sizeof *callee, FUNC);
	for (i = 0; i < n; i++) {
		int *uid = Seq_remlo(in->v.rcc_Function.callee);
		callee[i] = uid2symbol(*uid);
		free(uid);
	}
	callee[i] = NULL;
	Seq_free(&in->v.rcc_Function.callee);
	cfunc->u.f.callee = callee;
	cfunc->defined = 1;
	/*
	 Initialize the code list,
	  traverse the interfaces inside the function;
	  each call appends code list entries.
	*/
	codelist = &codehead;
	codelist->next = NULL;
	n = Seq_length(in->v.rcc_Function.codelist);
	for (i = 0; i < n; i++)
		interface(Seq_remlo(in->v.rcc_Function.codelist));
	Seq_free(&in->v.rcc_Function.codelist);
	/*
	 Call the back end,
	 Wrap-up.
	*/
	exitscope();
	(*IR->function)(cfunc, caller, callee, in->v.rcc_Function.ncalls);
	cfunc = NULL;
	labels = NULL;
}

static struct block {
	Code begin;
	struct block *prev;
} *blockstack = NULL;

static void doBlockbeg(rcc_interface_ty in) {
	struct block *b;
	Code cp = code(Blockbeg);

	enterscope();
	cp->u.block.level = level;
	cp->u.block.locals = newarray(1, sizeof *cp->u.block.locals, FUNC);
	cp->u.block.locals[0] = NULL;
	cp->u.block.identifiers = NULL;
	cp->u.block.types = NULL;
	NEW(b, FUNC);
	b->begin = cp;
	b->prev = blockstack;
	blockstack = b;
}

static void doBlockend(rcc_interface_ty in) {
	assert(blockstack);
	code(Blockend)->u.begin = blockstack->begin;
	blockstack = blockstack->prev;
	exitscope();
}

static Node visit(rcc_node_ty node) {
	int op;
	Node left = NULL, right = NULL, p = NULL;
	Symbol sym = NULL;

	switch (node->kind) {
#define T(x) rcc_##x##_enum
	case T(CSE): {
		Symbol q = uid2symbol(node->v.rcc_CSE.uid);
		assert(q->temporary);
		q->u.t.cse = p = visit(node->v.rcc_CSE.node);
		break;
		}
	case T(CNST): {
		Value v;
		v.i = node->v.rcc_CNST.value;
		sym = constant(btot(node->suffix, node->size), v);
		op = CNST;
		break;
		}
	case T(CNSTF): {
		Value v;
		unsigned *p = (unsigned *)&v.d;
		p[swap]   = node->v.rcc_CNSTF.value->msb;
		p[1-swap] = node->v.rcc_CNSTF.value->lsb;
		sym = constant(btot(node->suffix, node->size), v);
		free(node->v.rcc_CNSTF.value);
		op = CNST;
		break;
		}
	case T(ARG):
		p = newnode(ARG + node->suffix + sizeop(node->size),
			visit(node->v.rcc_ARG.left), NULL,
			intconst(node->v.rcc_ARG.len));
		p->syms[1] = intconst(node->v.rcc_ARG.align);
		break;
	case T(ASGN):
		p = newnode(ASGN + node->suffix + sizeop(node->size),
			visit(node->v.rcc_ASGN.left), visit(node->v.rcc_ASGN.right),
			intconst(node->v.rcc_ASGN.len));
		p->syms[1] = intconst(node->v.rcc_ASGN.align);
		break;
	case T(CVT):
		op = node->v.rcc_CVT.op;
		left = visit(node->v.rcc_CVT.left);
		sym = intconst(node->v.rcc_CVT.fromsize);
		break;
	case T(CALL):
		op = CALL;
		left = visit(node->v.rcc_CALL.left);
		NEW0(sym, FUNC);
		sym->type = uid2type(node->v.rcc_CALL.type);
		break;
	case T(CALLB):
		op = CALL;
		left  = visit(node->v.rcc_CALLB.left);
		right = visit(node->v.rcc_CALLB.right);
		NEW0(sym, FUNC);
		sym->type = uid2type(node->v.rcc_CALLB.type);
		break;
	case T(RET):
		op = RET;
		break;
	case T(ADDRG):
		op = ADDRG;
		sym = uid2symbol(node->v.rcc_ADDRG.uid);
		break;
	case T(ADDRL):
		op = ADDRL;
		sym = uid2symbol(node->v.rcc_ADDRG.uid);
		break;
	case T(ADDRF):
		op = ADDRF;
		sym = uid2symbol(node->v.rcc_ADDRG.uid);
		break;
	case T(Unary):
		op = node->v.rcc_Unary.op;
		left = visit(node->v.rcc_Unary.left);
		break;
	case T(Binary):
		op = node->v.rcc_Binary.op;
		left  = visit(node->v.rcc_Binary.left);
		right = visit(node->v.rcc_Binary.right);
		break;
	case T(Compare):
		op = node->v.rcc_Compare.op;
		left  = visit(node->v.rcc_Compare.left);
		right = visit(node->v.rcc_Compare.right);
		sym = findlabel(node->v.rcc_Compare.label);
		break;
	case T(LABEL):
		op = LABEL;
		sym = findlabel(node->v.rcc_LABEL.label);
		break;
	case T(BRANCH):
		op = JUMP;
		left = newnode(ADDRG+P+sizeop(voidptype->size), NULL, NULL, findlabel(node->v.rcc_BRANCH.label));
		break;
#undef T
	default: assert(0);
	}
	if (p == NULL)
		p = newnode(op + node->suffix + sizeop(node->size), left, right, sym);
	free(node);
	return p;
}

static void doForest(rcc_interface_ty in) {
	Node *tail = &code(Gen)->u.forest;
	int i, n = Seq_length(in->v.rcc_Forest.nodes);

	for (i = 0; i < n; i++) {
		*tail = visit(Seq_remlo(in->v.rcc_Forest.nodes));
		assert(*tail);
		tail = &(*tail)->link;
	}
	*tail = NULL;
	Seq_free(&in->v.rcc_Forest.nodes);
}

int main(int argc, char *argv[]) {
	int i, version;
	float stamp = (assert(strstr(rcsid, ",v")), strtod(strstr(rcsid, ",v")+2, NULL))
;
	char *infile = NULL, *outfile = NULL;
	rcc_program_ty pickle;

	for (i = 1; i < argc; i++)
		if (*argv[i] != '-' || strcmp(argv[i], "-") == 0) {
			if (infile == NULL)
				infile = argv[i];
			else if (outfile == NULL)
				outfile = argv[i];
		}
	if (infile != NULL && strcmp(infile, "-") != 0
	&& freopen(infile, "rb", stdin) == NULL) {
		fprint(stderr, "%s: can't read `%s'\n", argv[0], infile);
		exit(EXIT_FAILURE);
	}
#if WIN32
	else
		_setmode(_fileno(stdin), _O_BINARY);
#endif
	if (outfile != NULL && strcmp(outfile, "-") != 0
	&& freopen(outfile, "w", stdout) == NULL) {
		fprint(stderr, "%s: can't write `%s'\n", argv[0], outfile);
		exit(EXIT_FAILURE);
	}
	version = read_int(stdin);
	assert(version/100 == (int)stamp);
	pickle = rcc_read_program(stdin);
	argc = pickle->argc;
	argv = newarray(argc + 1, sizeof *argv, PERM);
	{
		for (i = 0; i < argc; i++) {
			string_ty *arg = Seq_remlo(pickle->argv);
			argv[i] = (char *)arg->str;
			free(arg);
		}
		argv[i] = NULL;
		assert(i == argc);
		Seq_free(&pickle->argv);
	}
	for (i = argc - 1; i > 0; i--)
		if (strncmp(argv[i], "-target=", 8) == 0)
			break;
	if (i > 0) {
		int j;
		for (j = 0; bindings[j].name && bindings[j].ir; j++)
			if (strcmp(&argv[i][8], bindings[j].name) == 0) {
				IR = bindings[j].ir;
				break;
			}
	}
	if (!IR) {
		fprint(stderr, "%s: unknown target", argv[0]);
		if (i > 0)
			fprint(stderr, " `%s'", &argv[i][8]);
		fprint(stderr, "; must specify one of\n");
		for (i = 0; bindings[i].name; i++)
			fprint(stderr, "\t-target=%s\n", bindings[i].name);
		exit(EXIT_FAILURE);
	}
	IR->wants_dag = 0;	/* pickle's hold trees */
	init(argc, argv);
	genlabel(pickle->nlabels);
	level = GLOBAL;
	{
		int i, count;
		nuids = pickle->nuids;
		items = newarray(nuids, sizeof *items, PERM);
		itemmap = newarray(nuids, sizeof *items, PERM);
		for (i = 0; i < nuids; i++) {
			itemmap[i] = NULL;
			items[i] = NULL;
		}
		(*IR->progbeg)(argc, argv);
		count = Seq_length(pickle->items);
		for (i = 0; i < count; i++) {
			rcc_item_ty item = Seq_remlo(pickle->items);
			int uid = item->uid;
			assert(uid >= 0 && uid < nuids);
			assert(items[uid] == NULL);
			items[uid] = item;
		}
		Seq_free(&pickle->items);
#define xx(s) assert(rcc_##s##_enum < sizeof doX/sizeof doX[0] && doX[rcc_##s##_enum]==0); \
	      doX[rcc_##s##_enum] = do##s;
	      xx(Export)
	      xx(Import)
	      xx(Global)
	      xx(Local)
	      xx(Address)
	      xx(Segment)
	      xx(Defaddress)
	      xx(Deflabel)
	      xx(Defconst)
	      xx(Defconstf)
	      xx(Defstring)
	      xx(Space)
	      xx(Function)
	      xx(Blockbeg)
	      xx(Blockend)
	      xx(Forest)
#undef xx
		count = Seq_length(pickle->interfaces);
		for (i = 0; i < count; i++)
			interface(Seq_remlo(pickle->interfaces));
		Seq_free(&pickle->interfaces);
		free(pickle);
		(*IR->progend)();
	}
	deallocate(PERM);
	return errcnt > 0;
}

/* main_init - process program arguments */
void main_init(int argc, char *argv[]) {
	int i;
	static int inited;

	if (inited)
		return;
	inited = 1;
	for (i = 1; i < argc; i++)
		if (strcmp(argv[i], "-g") == 0 || strcmp(argv[i], "-g2") == 0)
			glevel = 2;
		else if (strcmp(argv[i], "-w") == 0)
			wflag++;
		else if (strcmp(argv[i], "-v") == 0) {
			fprint(stderr, "%s %s\n", argv[0], rcsid);
			verbose++;
		} else if (strncmp(argv[i], "-errout=", 8) == 0) {
			FILE *f = fopen(argv[i]+8, "w");
			if (f == NULL) {
				fprint(stderr, "%s: can't write errors to `%s'\n", argv[0], argv[i]+8);
				exit(EXIT_FAILURE);
			}
			fclose(f);
			f = freopen(argv[i]+8, "w", stderr);
			assert(f);
		} else if (strncmp(argv[i], "-e", 2) == 0) {
			int x;
			if ((x = strtol(&argv[i][2], NULL, 0)) > 0)
				errlimit = x;
		}
}

void init(int argc, char *argv[]) {
	{extern void main_init(int, char *[]); main_init(argc, argv);}
	{extern void prof_init(int, char *[]); prof_init(argc, argv);}
	{extern void trace_init(int, char *[]); trace_init(argc, argv);}
	{extern void type_init(int, char *[]); type_init(argc, argv);}
	{extern void x86linux_init(int, char *[]); x86linux_init(argc, argv);}
}