summaryrefslogtreecommitdiff
path: root/src/cmd/gc/export.c
blob: caac330d52dcca0ba3e90e680e9c6c9bd6a87b2a (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
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

#include	<u.h>
#include	<libc.h>
#include	"go.h"
#include	"y.tab.h"

static void	dumpexporttype(Type *t);

// Mark n's symbol as exported
void
exportsym(Node *n)
{
	if(n == N || n->sym == S)
		return;
	if(n->sym->flags & (SymExport|SymPackage)) {
		if(n->sym->flags & SymPackage)
			yyerror("export/package mismatch: %S", n->sym);
		return;
	}
	n->sym->flags |= SymExport;

	if(debug['E'])
		print("export symbol %S\n", n->sym);
	exportlist = list(exportlist, n);
}

int
exportname(char *s)
{
	Rune r;

	if((uchar)s[0] < Runeself)
		return 'A' <= s[0] && s[0] <= 'Z';
	chartorune(&r, s);
	return isupperrune(r);
}

static int
initname(char *s)
{
	return strcmp(s, "init") == 0;
}

// exportedsym returns whether a symbol will be visible
// to files that import our package.
static int
exportedsym(Sym *sym)
{
	// Builtins are visible everywhere.
	if(sym->pkg == builtinpkg || sym->origpkg == builtinpkg)
		return 1;

	return sym->pkg == localpkg && exportname(sym->name);
}

void
autoexport(Node *n, int ctxt)
{
	if(n == N || n->sym == S)
		return;
	if((ctxt != PEXTERN && ctxt != PFUNC) || dclcontext != PEXTERN)
		return;
	if(n->ntype && n->ntype->op == OTFUNC && n->ntype->left)	// method
		return;
	// -A is for cmd/gc/mkbuiltin script, so export everything
	if(debug['A'] || exportname(n->sym->name) || initname(n->sym->name))
		exportsym(n);
}

static void
dumppkg(Pkg *p)
{
	char *suffix;

	if(p == nil || p == localpkg || p->exported || p == builtinpkg)
		return;
	p->exported = 1;
	suffix = "";
	if(!p->direct)
		suffix = " // indirect";
	Bprint(bout, "\timport %s \"%Z\"%s\n", p->name, p->path, suffix);
}

// Look for anything we need for the inline body
static void reexportdep(Node *n);
static void
reexportdeplist(NodeList *ll)
{
	for(; ll ;ll=ll->next)
		reexportdep(ll->n);
}

static void
reexportdep(Node *n)
{
	Type *t;

	if(!n)
		return;

	//print("reexportdep %+hN\n", n);
	switch(n->op) {
	case ONAME:
		switch(n->class&~PHEAP) {
		case PFUNC:
			// methods will be printed along with their type
			// nodes for T.Method expressions
			if(n->left && n->left->op == OTYPE)
				break;
			// nodes for method calls.
			if(!n->type || n->type->thistuple > 0)
				break;
			// fallthrough
		case PEXTERN:
			if(n->sym && !exportedsym(n->sym)) {
				if(debug['E'])
					print("reexport name %S\n", n->sym);
				exportlist = list(exportlist, n);
			}
		}
		break;

	case ODCL:
		// Local variables in the bodies need their type.
		t = n->left->type;
		if(t != types[t->etype] && t != idealbool && t != idealstring) {
			if(isptr[t->etype])
				t = t->type;
			if(t && t->sym && t->sym->def && !exportedsym(t->sym)) {
				if(debug['E'])
					print("reexport type %S from declaration\n", t->sym);
				exportlist = list(exportlist, t->sym->def);
			}
		}
		break;

	case OLITERAL:
		t = n->type;
		if(t != types[n->type->etype] && t != idealbool && t != idealstring) {
			if(isptr[t->etype])
				t = t->type;
			if(t && t->sym && t->sym->def && !exportedsym(t->sym)) {
				if(debug['E'])
					print("reexport literal type %S\n", t->sym);
				exportlist = list(exportlist, t->sym->def);
			}
		}
		// fallthrough
	case OTYPE:
		if(n->sym && !exportedsym(n->sym)) {
			if(debug['E'])
				print("reexport literal/type %S\n", n->sym);
			exportlist = list(exportlist, n);
		}
		break;

	// for operations that need a type when rendered, put the type on the export list.
	case OCONV:
	case OCONVIFACE:
	case OCONVNOP:
	case ORUNESTR:
	case OARRAYBYTESTR:
	case OARRAYRUNESTR:
	case OSTRARRAYBYTE:
	case OSTRARRAYRUNE:
	case ODOTTYPE:
	case ODOTTYPE2:
	case OSTRUCTLIT:
	case OARRAYLIT:
	case OPTRLIT:
	case OMAKEMAP:
	case OMAKESLICE:
	case OMAKECHAN:
		t = n->type;
		if(!t->sym && t->type)
			t = t->type;
		if(t && t->sym && t->sym->def && !exportedsym(t->sym)) {
			if(debug['E'])
				print("reexport type for expression %S\n", t->sym);
			exportlist = list(exportlist, t->sym->def);
		}
		break;
	}

	reexportdep(n->left);
	reexportdep(n->right);
	reexportdeplist(n->list);
	reexportdeplist(n->rlist);
	reexportdeplist(n->ninit);
	reexportdep(n->ntest);
	reexportdep(n->nincr);
	reexportdeplist(n->nbody);
	reexportdeplist(n->nelse);
}


static void
dumpexportconst(Sym *s)
{
	Node *n;
	Type *t;

	n = s->def;
	typecheck(&n, Erv);
	if(n == N || n->op != OLITERAL)
		fatal("dumpexportconst: oconst nil: %S", s);

	t = n->type;	// may or may not be specified
	dumpexporttype(t);

	if(t != T && !isideal(t))
		Bprint(bout, "\tconst %#S %#T = %#V\n", s, t, &n->val);
	else
		Bprint(bout, "\tconst %#S = %#V\n", s, &n->val);
}

static void
dumpexportvar(Sym *s)
{
	Node *n;
	Type *t;

	n = s->def;
	typecheck(&n, Erv|Ecall);
	if(n == N || n->type == T) {
		yyerror("variable exported but not defined: %S", s);
		return;
	}

	t = n->type;
	dumpexporttype(t);

	if(t->etype == TFUNC && n->class == PFUNC) {
		if (n->inl) {
			// when lazily typechecking inlined bodies, some re-exported ones may not have been typechecked yet.
			// currently that can leave unresolved ONONAMEs in import-dot-ed packages in the wrong package
			if(debug['l'] < 2)
				typecheckinl(n);
			// NOTE: The space after %#S here is necessary for ld's export data parser.
			Bprint(bout, "\tfunc %#S %#hT { %#H }\n", s, t, n->inl);
			reexportdeplist(n->inl);
		} else
			Bprint(bout, "\tfunc %#S %#hT\n", s, t);
	} else
		Bprint(bout, "\tvar %#S %#T\n", s, t);
}

static int
methcmp(const void *va, const void *vb)
{
	Type *a, *b;
	
	a = *(Type**)va;
	b = *(Type**)vb;
	return strcmp(a->sym->name, b->sym->name);
}

static void
dumpexporttype(Type *t)
{
	Type *f;
	Type **m;
	int i, n;

	if(t == T)
		return;
	if(t->printed || t == types[t->etype] || t == bytetype || t == runetype || t == errortype)
		return;
	t->printed = 1;

	if(t->sym != S && t->etype != TFIELD)
		dumppkg(t->sym->pkg);

	dumpexporttype(t->type);
	dumpexporttype(t->down);

	if (t->sym == S || t->etype == TFIELD)
		return;

	n = 0;
	for(f=t->method; f!=T; f=f->down) {	
		dumpexporttype(f);
		n++;
	}

	m = mal(n*sizeof m[0]);
	i = 0;
	for(f=t->method; f!=T; f=f->down)
		m[i++] = f;
	qsort(m, n, sizeof m[0], methcmp);

	Bprint(bout, "\ttype %#S %#lT\n", t->sym, t);
	for(i=0; i<n; i++) {
		f = m[i];
		if(f->nointerface)
			Bprint(bout, "\t//go:nointerface\n");
		if (f->type->nname && f->type->nname->inl) { // nname was set by caninl
			// when lazily typechecking inlined bodies, some re-exported ones may not have been typechecked yet.
			// currently that can leave unresolved ONONAMEs in import-dot-ed packages in the wrong package
			if(debug['l'] < 2)
				typecheckinl(f->type->nname);
			Bprint(bout, "\tfunc (%#T) %#hhS %#hT { %#H }\n", getthisx(f->type)->type, f->sym, f->type, f->type->nname->inl);
			reexportdeplist(f->type->nname->inl);
		} else
			Bprint(bout, "\tfunc (%#T) %#hhS %#hT\n", getthisx(f->type)->type, f->sym, f->type);
	}
}

static void
dumpsym(Sym *s)
{
	if(s->flags & SymExported)
		return;
	s->flags |= SymExported;

	if(s->def == N) {
		yyerror("unknown export symbol: %S", s);
		return;
	}
//	print("dumpsym %O %+S\n", s->def->op, s);
	dumppkg(s->pkg);

	switch(s->def->op) {
	default:
		yyerror("unexpected export symbol: %O %S", s->def->op, s);
		break;

	case OLITERAL:
		dumpexportconst(s);
		break;

	case OTYPE:
		if(s->def->type->etype == TFORW)
			yyerror("export of incomplete type %S", s);
		else
			dumpexporttype(s->def->type);
		break;

	case ONAME:
		dumpexportvar(s);
		break;
	}
}

void
dumpexport(void)
{
	NodeList *l;
	int32 i, lno;
	Pkg *p;

	lno = lineno;

	Bprint(bout, "\n$$  // exports\n    package %s", localpkg->name);
	if(safemode)
		Bprint(bout, " safe");
	Bprint(bout, "\n");

	for(i=0; i<nelem(phash); i++)
		for(p=phash[i]; p; p=p->link)
			if(p->direct)
				dumppkg(p);

	for(l=exportlist; l; l=l->next) {
		lineno = l->n->lineno;
		dumpsym(l->n->sym);
	}

	Bprint(bout, "\n$$  // local types\n\n$$\n");   // 6l expects this. (see ld/go.c)

	lineno = lno;
}

/*
 * import
 */

/*
 * return the sym for ss, which should match lexical
 */
Sym*
importsym(Sym *s, int op)
{
	char *pkgstr;

	if(s->def != N && s->def->op != op) {
		pkgstr = smprint("during import \"%Z\"", importpkg->path);
		redeclare(s, pkgstr);
	}

	// mark the symbol so it is not reexported
	if(s->def == N) {
		if(exportname(s->name) || initname(s->name))
			s->flags |= SymExport;
		else
			s->flags |= SymPackage;	// package scope
	}
	return s;
}

/*
 * return the type pkg.name, forward declaring if needed
 */
Type*
pkgtype(Sym *s)
{
	Type *t;

	importsym(s, OTYPE);
	if(s->def == N || s->def->op != OTYPE) {
		t = typ(TFORW);
		t->sym = s;
		s->def = typenod(t);
	}
	if(s->def->type == T)
		yyerror("pkgtype %S", s);
	return s->def->type;
}

void
importimport(Sym *s, Strlit *z)
{
	// Informational: record package name
	// associated with import path, for use in
	// human-readable messages.
	Pkg *p;

	if(isbadimport(z))
		errorexit();
	p = mkpkg(z);
	if(p->name == nil) {
		p->name = s->name;
		pkglookup(s->name, nil)->npkg++;
	} else if(strcmp(p->name, s->name) != 0)
		yyerror("conflicting names %s and %s for package \"%Z\"", p->name, s->name, p->path);
	
	if(!incannedimport && myimportpath != nil && strcmp(z->s, myimportpath) == 0) {
		yyerror("import \"%Z\": package depends on \"%Z\" (import cycle)", importpkg->path, z);
		errorexit();
	}
}

void
importconst(Sym *s, Type *t, Node *n)
{
	Node *n1;

	importsym(s, OLITERAL);
	convlit(&n, t);

	if(s->def != N)	 // TODO: check if already the same.
		return;

	if(n->op != OLITERAL) {
		yyerror("expression must be a constant");
		return;
	}

	if(n->sym != S) {
		n1 = nod(OXXX, N, N);
		*n1 = *n;
		n = n1;
	}
	n->orig = newname(s);
	n->sym = s;
	declare(n, PEXTERN);

	if(debug['E'])
		print("import const %S\n", s);
}

void
importvar(Sym *s, Type *t)
{
	Node *n;

	importsym(s, ONAME);
	if(s->def != N && s->def->op == ONAME) {
		if(eqtype(t, s->def->type))
			return;
		yyerror("inconsistent definition for var %S during import\n\t%T\n\t%T", s, s->def->type, t);
	}
	n = newname(s);
	n->type = t;
	declare(n, PEXTERN);

	if(debug['E'])
		print("import var %S %lT\n", s, t);
}

void
importtype(Type *pt, Type *t)
{
	Node *n;

	// override declaration in unsafe.go for Pointer.
	// there is no way in Go code to define unsafe.Pointer
	// so we have to supply it.
	if(incannedimport &&
	   strcmp(importpkg->name, "unsafe") == 0 &&
	   strcmp(pt->nod->sym->name, "Pointer") == 0) {
		t = types[TUNSAFEPTR];
	}

	if(pt->etype == TFORW) {
		n = pt->nod;
		copytype(pt->nod, t);
		pt->nod = n;		// unzero nod
		pt->sym->lastlineno = parserline();
		declare(n, PEXTERN);
		checkwidth(pt);
	} else if(!eqtype(pt->orig, t))
		yyerror("inconsistent definition for type %S during import\n\t%lT\n\t%lT", pt->sym, pt, t);

	if(debug['E'])
		print("import type %T %lT\n", pt, t);
}