Mercurial > projects > ldc
comparison dmd/access.c @ 1:c53b6e3fe49a trunk
[svn r5] Initial commit. Most things are very rough.
author | lindquist |
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date | Sat, 01 Sep 2007 21:43:27 +0200 |
parents | |
children | aaade6ded589 |
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0:a9e71648e74d | 1:c53b6e3fe49a |
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1 | |
2 // Copyright (c) 1999-2006 by Digital Mars | |
3 // All Rights Reserved | |
4 // written by Walter Bright | |
5 // http://www.digitalmars.com | |
6 // License for redistribution is by either the Artistic License | |
7 // in artistic.txt, or the GNU General Public License in gnu.txt. | |
8 // See the included readme.txt for details. | |
9 | |
10 | |
11 #include <stdio.h> | |
12 #include <stdlib.h> | |
13 #include <assert.h> | |
14 | |
15 #include "root.h" | |
16 #include "mem.h" | |
17 | |
18 #include "enum.h" | |
19 #include "aggregate.h" | |
20 #include "init.h" | |
21 #include "attrib.h" | |
22 #include "scope.h" | |
23 #include "id.h" | |
24 #include "mtype.h" | |
25 #include "declaration.h" | |
26 #include "aggregate.h" | |
27 #include "expression.h" | |
28 #include "module.h" | |
29 | |
30 #define LOG 0 | |
31 | |
32 /* Code to do access checks | |
33 */ | |
34 | |
35 int hasPackageAccess(Scope *sc, Dsymbol *s); | |
36 | |
37 /**************************************** | |
38 * Return PROT access for Dsymbol smember in this declaration. | |
39 */ | |
40 | |
41 enum PROT AggregateDeclaration::getAccess(Dsymbol *smember) | |
42 { | |
43 return PROTpublic; | |
44 } | |
45 | |
46 enum PROT StructDeclaration::getAccess(Dsymbol *smember) | |
47 { | |
48 enum PROT access_ret = PROTnone; | |
49 | |
50 #if LOG | |
51 printf("+StructDeclaration::getAccess(this = '%s', smember = '%s')\n", | |
52 toChars(), smember->toChars()); | |
53 #endif | |
54 if (smember->toParent() == this) | |
55 { | |
56 access_ret = smember->prot(); | |
57 } | |
58 else if (smember->isDeclaration()->isStatic()) | |
59 { | |
60 access_ret = smember->prot(); | |
61 } | |
62 return access_ret; | |
63 } | |
64 | |
65 enum PROT ClassDeclaration::getAccess(Dsymbol *smember) | |
66 { | |
67 enum PROT access_ret = PROTnone; | |
68 | |
69 #if LOG | |
70 printf("+ClassDeclaration::getAccess(this = '%s', smember = '%s')\n", | |
71 toChars(), smember->toChars()); | |
72 #endif | |
73 if (smember->toParent() == this) | |
74 { | |
75 access_ret = smember->prot(); | |
76 } | |
77 else | |
78 { | |
79 enum PROT access; | |
80 int i; | |
81 | |
82 if (smember->isDeclaration()->isStatic()) | |
83 { | |
84 access_ret = smember->prot(); | |
85 } | |
86 | |
87 for (i = 0; i < baseclasses.dim; i++) | |
88 { BaseClass *b = (BaseClass *)baseclasses.data[i]; | |
89 | |
90 access = b->base->getAccess(smember); | |
91 switch (access) | |
92 { | |
93 case PROTnone: | |
94 break; | |
95 | |
96 case PROTprivate: | |
97 access = PROTnone; // private members of base class not accessible | |
98 break; | |
99 | |
100 case PROTpackage: | |
101 case PROTprotected: | |
102 case PROTpublic: | |
103 case PROTexport: | |
104 // If access is to be tightened | |
105 if (b->protection < access) | |
106 access = b->protection; | |
107 | |
108 // Pick path with loosest access | |
109 if (access > access_ret) | |
110 access_ret = access; | |
111 break; | |
112 | |
113 default: | |
114 assert(0); | |
115 } | |
116 } | |
117 } | |
118 #if LOG | |
119 printf("-ClassDeclaration::getAccess(this = '%s', smember = '%s') = %d\n", | |
120 toChars(), smember->toChars(), access_ret); | |
121 #endif | |
122 return access_ret; | |
123 } | |
124 | |
125 /******************************************************** | |
126 * Helper function for ClassDeclaration::accessCheck() | |
127 * Returns: | |
128 * 0 no access | |
129 * 1 access | |
130 */ | |
131 | |
132 static int accessCheckX( | |
133 Dsymbol *smember, | |
134 Dsymbol *sfunc, | |
135 AggregateDeclaration *dthis, | |
136 AggregateDeclaration *cdscope) | |
137 { | |
138 assert(dthis); | |
139 | |
140 #if 0 | |
141 printf("accessCheckX for %s.%s in function %s() in scope %s\n", | |
142 dthis->toChars(), smember->toChars(), | |
143 sfunc ? sfunc->toChars() : "NULL", | |
144 cdscope ? cdscope->toChars() : "NULL"); | |
145 #endif | |
146 if (dthis->hasPrivateAccess(sfunc) || | |
147 dthis->isFriendOf(cdscope)) | |
148 { | |
149 if (smember->toParent() == dthis) | |
150 return 1; | |
151 else | |
152 { | |
153 ClassDeclaration *cdthis = dthis->isClassDeclaration(); | |
154 if (cdthis) | |
155 { | |
156 for (int i = 0; i < cdthis->baseclasses.dim; i++) | |
157 { BaseClass *b = (BaseClass *)cdthis->baseclasses.data[i]; | |
158 enum PROT access; | |
159 | |
160 access = b->base->getAccess(smember); | |
161 if (access >= PROTprotected || | |
162 accessCheckX(smember, sfunc, b->base, cdscope) | |
163 ) | |
164 return 1; | |
165 | |
166 } | |
167 } | |
168 } | |
169 } | |
170 else | |
171 { | |
172 if (smember->toParent() != dthis) | |
173 { | |
174 ClassDeclaration *cdthis = dthis->isClassDeclaration(); | |
175 if (cdthis) | |
176 { | |
177 for (int i = 0; i < cdthis->baseclasses.dim; i++) | |
178 { BaseClass *b = (BaseClass *)cdthis->baseclasses.data[i]; | |
179 | |
180 if (accessCheckX(smember, sfunc, b->base, cdscope)) | |
181 return 1; | |
182 } | |
183 } | |
184 } | |
185 } | |
186 return 0; | |
187 } | |
188 | |
189 /******************************* | |
190 * Do access check for member of this class, this class being the | |
191 * type of the 'this' pointer used to access smember. | |
192 */ | |
193 | |
194 void AggregateDeclaration::accessCheck(Loc loc, Scope *sc, Dsymbol *smember) | |
195 { | |
196 int result; | |
197 | |
198 FuncDeclaration *f = sc->func; | |
199 AggregateDeclaration *cdscope = sc->getStructClassScope(); | |
200 enum PROT access; | |
201 | |
202 #if LOG | |
203 printf("AggregateDeclaration::accessCheck() for %s.%s in function %s() in scope %s\n", | |
204 toChars(), smember->toChars(), | |
205 f ? f->toChars() : NULL, | |
206 cdscope ? cdscope->toChars() : NULL); | |
207 #endif | |
208 | |
209 Dsymbol *smemberparent = smember->toParent(); | |
210 if (!smemberparent || !smemberparent->isAggregateDeclaration()) | |
211 { | |
212 #if LOG | |
213 printf("not an aggregate member\n"); | |
214 #endif | |
215 return; // then it is accessible | |
216 } | |
217 | |
218 // BUG: should enable this check | |
219 //assert(smember->parent->isBaseOf(this, NULL)); | |
220 | |
221 if (smemberparent == this) | |
222 { enum PROT access = smember->prot(); | |
223 | |
224 result = access >= PROTpublic || | |
225 hasPrivateAccess(f) || | |
226 isFriendOf(cdscope) || | |
227 (access == PROTpackage && hasPackageAccess(sc, this)); | |
228 #if LOG | |
229 printf("result1 = %d\n", result); | |
230 #endif | |
231 } | |
232 else if ((access = this->getAccess(smember)) >= PROTpublic) | |
233 { | |
234 result = 1; | |
235 #if LOG | |
236 printf("result2 = %d\n", result); | |
237 #endif | |
238 } | |
239 else if (access == PROTpackage && hasPackageAccess(sc, this)) | |
240 { | |
241 result = 1; | |
242 #if LOG | |
243 printf("result3 = %d\n", result); | |
244 #endif | |
245 } | |
246 else | |
247 { | |
248 result = accessCheckX(smember, f, this, cdscope); | |
249 #if LOG | |
250 printf("result4 = %d\n", result); | |
251 #endif | |
252 } | |
253 if (!result) | |
254 { | |
255 error(loc, "member %s is not accessible", smember->toChars()); | |
256 } | |
257 } | |
258 | |
259 /**************************************** | |
260 * Determine if this is the same or friend of cd. | |
261 */ | |
262 | |
263 int AggregateDeclaration::isFriendOf(AggregateDeclaration *cd) | |
264 { | |
265 #if LOG | |
266 printf("AggregateDeclaration::isFriendOf(this = '%s', cd = '%s')\n", toChars(), cd ? cd->toChars() : "null"); | |
267 #endif | |
268 if (this == cd) | |
269 return 1; | |
270 | |
271 // Friends if both are in the same module | |
272 //if (toParent() == cd->toParent()) | |
273 if (cd && getModule() == cd->getModule()) | |
274 { | |
275 #if LOG | |
276 printf("\tin same module\n"); | |
277 #endif | |
278 return 1; | |
279 } | |
280 | |
281 #if LOG | |
282 printf("\tnot friend\n"); | |
283 #endif | |
284 return 0; | |
285 } | |
286 | |
287 /**************************************** | |
288 * Determine if scope sc has package level access to s. | |
289 */ | |
290 | |
291 int hasPackageAccess(Scope *sc, Dsymbol *s) | |
292 { | |
293 #if LOG | |
294 printf("hasPackageAccess(s = '%s', sc = '%p')\n", s->toChars(), sc); | |
295 #endif | |
296 | |
297 for (; s; s = s->parent) | |
298 { | |
299 if (s->isPackage() && !s->isModule()) | |
300 break; | |
301 } | |
302 #if LOG | |
303 if (s) | |
304 printf("\tthis is in package '%s'\n", s->toChars()); | |
305 #endif | |
306 | |
307 if (s && s == sc->module->parent) | |
308 { | |
309 #if LOG | |
310 printf("\ts is in same package as sc\n"); | |
311 #endif | |
312 return 1; | |
313 } | |
314 | |
315 | |
316 #if LOG | |
317 printf("\tno package access\n"); | |
318 #endif | |
319 return 0; | |
320 } | |
321 | |
322 /********************************** | |
323 * Determine if smember has access to private members of this declaration. | |
324 */ | |
325 | |
326 int AggregateDeclaration::hasPrivateAccess(Dsymbol *smember) | |
327 { | |
328 if (smember) | |
329 { AggregateDeclaration *cd = NULL; | |
330 Dsymbol *smemberparent = smember->toParent(); | |
331 if (smemberparent) | |
332 cd = smemberparent->isAggregateDeclaration(); | |
333 | |
334 #if LOG | |
335 printf("AggregateDeclaration::hasPrivateAccess(class %s, member %s)\n", | |
336 toChars(), smember->toChars()); | |
337 #endif | |
338 | |
339 if (this == cd) // smember is a member of this class | |
340 { | |
341 #if LOG | |
342 printf("\tyes 1\n"); | |
343 #endif | |
344 return 1; // so we get private access | |
345 } | |
346 | |
347 // If both are members of the same module, grant access | |
348 while (1) | |
349 { Dsymbol *sp = smember->toParent(); | |
350 if (sp->isFuncDeclaration() && smember->isFuncDeclaration()) | |
351 smember = sp; | |
352 else | |
353 break; | |
354 } | |
355 if (!cd && toParent() == smember->toParent()) | |
356 { | |
357 #if LOG | |
358 printf("\tyes 2\n"); | |
359 #endif | |
360 return 1; | |
361 } | |
362 if (!cd && getModule() == smember->getModule()) | |
363 { | |
364 #if LOG | |
365 printf("\tyes 3\n"); | |
366 #endif | |
367 return 1; | |
368 } | |
369 } | |
370 #if LOG | |
371 printf("\tno\n"); | |
372 #endif | |
373 return 0; | |
374 } | |
375 | |
376 /**************************************** | |
377 * Check access to d for expression e.d | |
378 */ | |
379 | |
380 void accessCheck(Loc loc, Scope *sc, Expression *e, Declaration *d) | |
381 { | |
382 #if LOG | |
383 if (e) | |
384 { printf("accessCheck(%s . %s)\n", e->toChars(), d->toChars()); | |
385 printf("\te->type = %s\n", e->type->toChars()); | |
386 } | |
387 else | |
388 { | |
389 //printf("accessCheck(%s)\n", d->toChars()); | |
390 } | |
391 #endif | |
392 if (!e) | |
393 { | |
394 if (d->prot() == PROTprivate && d->getModule() != sc->module || | |
395 d->prot() == PROTpackage && !hasPackageAccess(sc, d)) | |
396 | |
397 error(loc, "%s %s.%s is not accessible from %s", | |
398 d->kind(), d->getModule()->toChars(), d->toChars(), sc->module->toChars()); | |
399 } | |
400 else if (e->type->ty == Tclass) | |
401 { // Do access check | |
402 ClassDeclaration *cd; | |
403 | |
404 cd = (ClassDeclaration *)(((TypeClass *)e->type)->sym); | |
405 #if 1 | |
406 if (e->op == TOKsuper) | |
407 { ClassDeclaration *cd2; | |
408 | |
409 cd2 = sc->func->toParent()->isClassDeclaration(); | |
410 if (cd2) | |
411 cd = cd2; | |
412 } | |
413 #endif | |
414 cd->accessCheck(loc, sc, d); | |
415 } | |
416 else if (e->type->ty == Tstruct) | |
417 { // Do access check | |
418 StructDeclaration *cd; | |
419 | |
420 cd = (StructDeclaration *)(((TypeStruct *)e->type)->sym); | |
421 cd->accessCheck(loc, sc, d); | |
422 } | |
423 } |