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36739040 TT |
1 | // link.cc - Code for linking and resolving classes and pool entries. |
2 | ||
8b1753e3 | 3 | /* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation |
36739040 TT |
4 | |
5 | This file is part of libgcj. | |
6 | ||
7 | This software is copyrighted work licensed under the terms of the | |
8 | Libgcj License. Please consult the file "LIBGCJ_LICENSE" for | |
9 | details. */ | |
10 | ||
11 | /* Author: Kresten Krab Thorup <krab@gnu.org> */ | |
12 | ||
13 | #include <config.h> | |
14 | #include <platform.h> | |
15 | ||
7faf2821 HB |
16 | #include <stdio.h> |
17 | ||
1cfdf07f DD |
18 | #ifdef USE_LIBFFI |
19 | #include <ffi.h> | |
20 | #endif | |
21 | ||
36739040 TT |
22 | #include <java-interp.h> |
23 | ||
621ae65d AH |
24 | // Set GC_DEBUG before including gc.h! |
25 | #ifdef LIBGCJ_GC_DEBUG | |
26 | # define GC_DEBUG | |
27 | #endif | |
28 | #include <gc.h> | |
29 | ||
36739040 TT |
30 | #include <jvm.h> |
31 | #include <gcj/cni.h> | |
32 | #include <string.h> | |
7edc2bad | 33 | #include <limits.h> |
36739040 TT |
34 | #include <java-cpool.h> |
35 | #include <execution.h> | |
36 | #include <java/lang/Class.h> | |
37 | #include <java/lang/String.h> | |
38 | #include <java/lang/StringBuffer.h> | |
39 | #include <java/lang/Thread.h> | |
40 | #include <java/lang/InternalError.h> | |
41 | #include <java/lang/VirtualMachineError.h> | |
42 | #include <java/lang/VerifyError.h> | |
43 | #include <java/lang/NoSuchFieldError.h> | |
44 | #include <java/lang/NoSuchMethodError.h> | |
45 | #include <java/lang/ClassFormatError.h> | |
46 | #include <java/lang/IllegalAccessError.h> | |
c1a9321f | 47 | #include <java/lang/InternalError.h> |
36739040 TT |
48 | #include <java/lang/AbstractMethodError.h> |
49 | #include <java/lang/NoClassDefFoundError.h> | |
50 | #include <java/lang/IncompatibleClassChangeError.h> | |
51 | #include <java/lang/VerifyError.h> | |
52 | #include <java/lang/VMClassLoader.h> | |
53 | #include <java/lang/reflect/Modifier.h> | |
54 | #include <java/security/CodeSource.h> | |
55 | ||
56 | using namespace gcj; | |
57 | ||
36739040 TT |
58 | typedef unsigned int uaddr __attribute__ ((mode (pointer))); |
59 | ||
60 | template<typename T> | |
61 | struct aligner | |
62 | { | |
63 | char c; | |
64 | T field; | |
65 | }; | |
66 | ||
67 | #define ALIGNOF(TYPE) (offsetof (aligner<TYPE>, field)) | |
68 | ||
69 | // This returns the alignment of a type as it would appear in a | |
70 | // structure. This can be different from the alignment of the type | |
71 | // itself. For instance on x86 double is 8-aligned but struct{double} | |
72 | // is 4-aligned. | |
73 | int | |
74 | _Jv_Linker::get_alignment_from_class (jclass klass) | |
75 | { | |
76 | if (klass == JvPrimClass (byte)) | |
77 | return ALIGNOF (jbyte); | |
78 | else if (klass == JvPrimClass (short)) | |
79 | return ALIGNOF (jshort); | |
80 | else if (klass == JvPrimClass (int)) | |
81 | return ALIGNOF (jint); | |
82 | else if (klass == JvPrimClass (long)) | |
83 | return ALIGNOF (jlong); | |
84 | else if (klass == JvPrimClass (boolean)) | |
85 | return ALIGNOF (jboolean); | |
86 | else if (klass == JvPrimClass (char)) | |
87 | return ALIGNOF (jchar); | |
88 | else if (klass == JvPrimClass (float)) | |
89 | return ALIGNOF (jfloat); | |
90 | else if (klass == JvPrimClass (double)) | |
91 | return ALIGNOF (jdouble); | |
92 | else | |
93 | return ALIGNOF (jobject); | |
94 | } | |
95 | ||
96 | void | |
97 | _Jv_Linker::resolve_field (_Jv_Field *field, java::lang::ClassLoader *loader) | |
98 | { | |
99 | if (! field->isResolved ()) | |
100 | { | |
8b6e7690 TT |
101 | _Jv_Utf8Const *sig = (_Jv_Utf8Const *) field->type; |
102 | jclass type = _Jv_FindClassFromSignature (sig->chars(), loader); | |
103 | if (type == NULL) | |
104 | throw new java::lang::NoClassDefFoundError(field->name->toString()); | |
105 | field->type = type; | |
36739040 TT |
106 | field->flags &= ~_Jv_FIELD_UNRESOLVED_FLAG; |
107 | } | |
108 | } | |
109 | ||
0006c7b0 TT |
110 | // A helper for find_field that knows how to recursively search |
111 | // superclasses and interfaces. | |
112 | _Jv_Field * | |
113 | _Jv_Linker::find_field_helper (jclass search, _Jv_Utf8Const *name, | |
c1a9321f | 114 | _Jv_Utf8Const *type_name, jclass type, |
0006c7b0 TT |
115 | jclass *declarer) |
116 | { | |
117 | while (search) | |
118 | { | |
119 | // From 5.4.3.2. First search class itself. | |
120 | for (int i = 0; i < search->field_count; ++i) | |
121 | { | |
122 | _Jv_Field *field = &search->fields[i]; | |
21b23409 TT |
123 | if (! _Jv_equalUtf8Consts (field->name, name)) |
124 | continue; | |
125 | ||
c1a9321f RS |
126 | // Checks for the odd situation where we were able to retrieve the |
127 | // field's class from signature but the resolution of the field itself | |
128 | // failed which means a different class was resolved. | |
129 | if (type != NULL) | |
130 | { | |
131 | try | |
132 | { | |
133 | resolve_field (field, search->loader); | |
134 | } | |
135 | catch (java::lang::Throwable *exc) | |
136 | { | |
137 | java::lang::LinkageError *le = new java::lang::LinkageError | |
138 | (JvNewStringLatin1 | |
139 | ("field type mismatch with different loaders")); | |
140 | ||
141 | le->initCause(exc); | |
142 | ||
143 | throw le; | |
144 | } | |
145 | } | |
21b23409 TT |
146 | |
147 | // Note that we compare type names and not types. This is | |
148 | // bizarre, but we do it because we want to find a field | |
149 | // (and terminate the search) if it has the correct | |
150 | // descriptor -- but then later reject it if the class | |
151 | // loader check results in different classes. We can't just | |
152 | // pass in the descriptor and check that way, because when | |
153 | // the field is already resolved there is no easy way to | |
154 | // find its descriptor again. | |
592fb510 RS |
155 | if ((field->isResolved () |
156 | ? _Jv_equalUtf8Classnames (type_name, field->type->name) | |
157 | : _Jv_equalUtf8Classnames (type_name, | |
158 | (_Jv_Utf8Const *) field->type))) | |
0006c7b0 TT |
159 | { |
160 | *declarer = search; | |
161 | return field; | |
162 | } | |
163 | } | |
164 | ||
165 | // Next search direct interfaces. | |
166 | for (int i = 0; i < search->interface_count; ++i) | |
167 | { | |
168 | _Jv_Field *result = find_field_helper (search->interfaces[i], name, | |
c1a9321f | 169 | type_name, type, declarer); |
0006c7b0 TT |
170 | if (result) |
171 | return result; | |
172 | } | |
173 | ||
174 | // Now search superclass. | |
175 | search = search->superclass; | |
176 | } | |
177 | ||
178 | return NULL; | |
179 | } | |
180 | ||
e207dbea TT |
181 | bool |
182 | _Jv_Linker::has_field_p (jclass search, _Jv_Utf8Const *field_name) | |
183 | { | |
184 | for (int i = 0; i < search->field_count; ++i) | |
185 | { | |
186 | _Jv_Field *field = &search->fields[i]; | |
187 | if (_Jv_equalUtf8Consts (field->name, field_name)) | |
188 | return true; | |
189 | } | |
190 | return false; | |
191 | } | |
192 | ||
0006c7b0 TT |
193 | // Find a field. |
194 | // KLASS is the class that is requesting the field. | |
195 | // OWNER is the class in which the field should be found. | |
196 | // FIELD_TYPE_NAME is the type descriptor for the field. | |
f3dc41fe AH |
197 | // Fill FOUND_CLASS with the address of the class in which the field |
198 | // is actually declared. | |
0006c7b0 TT |
199 | // This function does the class loader type checks, and |
200 | // also access checks. Returns the field, or throws an | |
201 | // exception on error. | |
202 | _Jv_Field * | |
203 | _Jv_Linker::find_field (jclass klass, jclass owner, | |
f3dc41fe | 204 | jclass *found_class, |
0006c7b0 TT |
205 | _Jv_Utf8Const *field_name, |
206 | _Jv_Utf8Const *field_type_name) | |
207 | { | |
21b23409 TT |
208 | // FIXME: this allocates a _Jv_Utf8Const each time. We should make |
209 | // it cheaper. | |
c1a9321f RS |
210 | // Note: This call will resolve the primitive type names ("Z", "B", ...) to |
211 | // their Java counterparts ("boolean", "byte", ...) if accessed via | |
212 | // field_type->name later. Using these variants of the type name is in turn | |
213 | // important for the find_field_helper function. However if the class | |
214 | // resolution failed then we can only use the already given type name. | |
215 | jclass field_type | |
216 | = _Jv_FindClassFromSignatureNoException (field_type_name->chars(), | |
217 | klass->loader); | |
218 | ||
219 | _Jv_Field *the_field | |
220 | = find_field_helper (owner, field_name, | |
221 | (field_type | |
222 | ? field_type->name : | |
223 | field_type_name ), | |
224 | field_type, found_class); | |
0006c7b0 TT |
225 | |
226 | if (the_field == 0) | |
227 | { | |
228 | java::lang::StringBuffer *sb = new java::lang::StringBuffer(); | |
229 | sb->append(JvNewStringLatin1("field ")); | |
230 | sb->append(owner->getName()); | |
231 | sb->append(JvNewStringLatin1(".")); | |
232 | sb->append(_Jv_NewStringUTF(field_name->chars())); | |
233 | sb->append(JvNewStringLatin1(" was not found.")); | |
234 | throw new java::lang::NoSuchFieldError (sb->toString()); | |
235 | } | |
236 | ||
c1a9321f RS |
237 | // Accept it when the field's class could not be resolved. |
238 | if (field_type == NULL) | |
239 | // Silently ignore that we were not able to retrieve the type to make it | |
240 | // possible to run code which does not access this field. | |
241 | return the_field; | |
242 | ||
f3dc41fe | 243 | if (_Jv_CheckAccess (klass, *found_class, the_field->flags)) |
0006c7b0 | 244 | { |
21b23409 TT |
245 | // Note that the field returned by find_field_helper is always |
246 | // resolved. There's no point checking class loaders here, | |
247 | // since we already did the work to look up all the types. | |
248 | // FIXME: being lazy here would be nice. | |
249 | if (the_field->type != field_type) | |
0006c7b0 TT |
250 | throw new java::lang::LinkageError |
251 | (JvNewStringLatin1 | |
252 | ("field type mismatch with different loaders")); | |
253 | } | |
254 | else | |
255 | { | |
256 | java::lang::StringBuffer *sb | |
257 | = new java::lang::StringBuffer (); | |
258 | sb->append(klass->getName()); | |
259 | sb->append(JvNewStringLatin1(": ")); | |
f3dc41fe | 260 | sb->append((*found_class)->getName()); |
0006c7b0 TT |
261 | sb->append(JvNewStringLatin1(".")); |
262 | sb->append(_Jv_NewStringUtf8Const (field_name)); | |
263 | throw new java::lang::IllegalAccessError(sb->toString()); | |
264 | } | |
265 | ||
266 | return the_field; | |
267 | } | |
268 | ||
36739040 | 269 | _Jv_word |
c1a9321f | 270 | _Jv_Linker::resolve_pool_entry (jclass klass, int index, bool lazy) |
36739040 TT |
271 | { |
272 | using namespace java::lang::reflect; | |
273 | ||
621ae65d AH |
274 | if (GC_base (klass) && klass->constants.data |
275 | && ! GC_base (klass->constants.data)) | |
276 | { | |
277 | jsize count = klass->constants.size; | |
278 | if (count) | |
279 | { | |
280 | _Jv_word* constants | |
281 | = (_Jv_word*) _Jv_AllocRawObj (count * sizeof (_Jv_word)); | |
282 | memcpy ((void*)constants, | |
283 | (void*)klass->constants.data, | |
284 | count * sizeof (_Jv_word)); | |
285 | klass->constants.data = constants; | |
286 | } | |
287 | } | |
288 | ||
36739040 TT |
289 | _Jv_Constants *pool = &klass->constants; |
290 | ||
291 | if ((pool->tags[index] & JV_CONSTANT_ResolvedFlag) != 0) | |
292 | return pool->data[index]; | |
293 | ||
294 | switch (pool->tags[index]) | |
295 | { | |
296 | case JV_CONSTANT_Class: | |
297 | { | |
298 | _Jv_Utf8Const *name = pool->data[index].utf8; | |
299 | ||
300 | jclass found; | |
301 | if (name->first() == '[') | |
c1a9321f RS |
302 | found = _Jv_FindClassFromSignatureNoException (name->chars(), |
303 | klass->loader); | |
304 | else | |
305 | found = _Jv_FindClassNoException (name, klass->loader); | |
306 | ||
307 | // If the class could not be loaded a phantom class is created. Any | |
308 | // function that deals with such a class but cannot do something useful | |
309 | // with it should just throw a NoClassDefFoundError with the class' | |
310 | // name. | |
36739040 | 311 | if (! found) |
c1a9321f RS |
312 | if (lazy) |
313 | { | |
314 | found = _Jv_NewClass(name, NULL, NULL); | |
315 | found->state = JV_STATE_PHANTOM; | |
316 | pool->tags[index] |= JV_CONSTANT_ResolvedFlag; | |
317 | pool->data[index].clazz = found; | |
318 | break; | |
319 | } | |
320 | else | |
321 | throw new java::lang::NoClassDefFoundError (name->toString()); | |
36739040 TT |
322 | |
323 | // Check accessibility, but first strip array types as | |
324 | // _Jv_ClassNameSamePackage can't handle arrays. | |
325 | jclass check; | |
326 | for (check = found; | |
327 | check && check->isArray(); | |
328 | check = check->getComponentType()) | |
329 | ; | |
330 | if ((found->accflags & Modifier::PUBLIC) == Modifier::PUBLIC | |
331 | || (_Jv_ClassNameSamePackage (check->name, | |
332 | klass->name))) | |
333 | { | |
334 | pool->data[index].clazz = found; | |
335 | pool->tags[index] |= JV_CONSTANT_ResolvedFlag; | |
336 | } | |
337 | else | |
338 | { | |
339 | java::lang::StringBuffer *sb = new java::lang::StringBuffer (); | |
340 | sb->append(klass->getName()); | |
341 | sb->append(JvNewStringLatin1(" can't access class ")); | |
342 | sb->append(found->getName()); | |
343 | throw new java::lang::IllegalAccessError(sb->toString()); | |
344 | } | |
345 | } | |
346 | break; | |
347 | ||
348 | case JV_CONSTANT_String: | |
349 | { | |
350 | jstring str; | |
351 | str = _Jv_NewStringUtf8Const (pool->data[index].utf8); | |
352 | pool->data[index].o = str; | |
353 | pool->tags[index] |= JV_CONSTANT_ResolvedFlag; | |
354 | } | |
355 | break; | |
356 | ||
357 | case JV_CONSTANT_Fieldref: | |
358 | { | |
359 | _Jv_ushort class_index, name_and_type_index; | |
360 | _Jv_loadIndexes (&pool->data[index], | |
361 | class_index, | |
362 | name_and_type_index); | |
c1a9321f RS |
363 | jclass owner = (resolve_pool_entry (klass, class_index, true)).clazz; |
364 | ||
365 | // If a phantom class was resolved our field reference is | |
366 | // unusable because of the missing class. | |
367 | if (owner->state == JV_STATE_PHANTOM) | |
368 | throw new java::lang::NoClassDefFoundError(owner->getName()); | |
36739040 TT |
369 | |
370 | if (owner != klass) | |
371 | _Jv_InitClass (owner); | |
372 | ||
373 | _Jv_ushort name_index, type_index; | |
374 | _Jv_loadIndexes (&pool->data[name_and_type_index], | |
375 | name_index, | |
376 | type_index); | |
377 | ||
378 | _Jv_Utf8Const *field_name = pool->data[name_index].utf8; | |
379 | _Jv_Utf8Const *field_type_name = pool->data[type_index].utf8; | |
380 | ||
f3dc41fe AH |
381 | jclass found_class = 0; |
382 | _Jv_Field *the_field = find_field (klass, owner, | |
383 | &found_class, | |
384 | field_name, | |
0006c7b0 | 385 | field_type_name); |
f3dc41fe AH |
386 | if (owner != found_class) |
387 | _Jv_InitClass (found_class); | |
36739040 TT |
388 | pool->data[index].field = the_field; |
389 | pool->tags[index] |= JV_CONSTANT_ResolvedFlag; | |
390 | } | |
391 | break; | |
392 | ||
393 | case JV_CONSTANT_Methodref: | |
394 | case JV_CONSTANT_InterfaceMethodref: | |
395 | { | |
396 | _Jv_ushort class_index, name_and_type_index; | |
397 | _Jv_loadIndexes (&pool->data[index], | |
398 | class_index, | |
399 | name_and_type_index); | |
400 | jclass owner = (resolve_pool_entry (klass, class_index)).clazz; | |
401 | ||
402 | if (owner != klass) | |
403 | _Jv_InitClass (owner); | |
404 | ||
405 | _Jv_ushort name_index, type_index; | |
406 | _Jv_loadIndexes (&pool->data[name_and_type_index], | |
407 | name_index, | |
408 | type_index); | |
409 | ||
410 | _Jv_Utf8Const *method_name = pool->data[name_index].utf8; | |
411 | _Jv_Utf8Const *method_signature = pool->data[type_index].utf8; | |
412 | ||
413 | _Jv_Method *the_method = 0; | |
414 | jclass found_class = 0; | |
415 | ||
416 | // We're going to cache a pointer to the _Jv_Method object | |
417 | // when we find it. So, to ensure this doesn't get moved from | |
418 | // beneath us, we first put all the needed Miranda methods | |
419 | // into the target class. | |
420 | wait_for_state (klass, JV_STATE_LOADED); | |
421 | ||
422 | // First search the class itself. | |
423 | the_method = search_method_in_class (owner, klass, | |
424 | method_name, method_signature); | |
425 | ||
426 | if (the_method != 0) | |
427 | { | |
428 | found_class = owner; | |
429 | goto end_of_method_search; | |
430 | } | |
431 | ||
432 | // If we are resolving an interface method, search the | |
433 | // interface's superinterfaces (A superinterface is not an | |
434 | // interface's superclass - a superinterface is implemented by | |
435 | // the interface). | |
436 | if (pool->tags[index] == JV_CONSTANT_InterfaceMethodref) | |
437 | { | |
438 | _Jv_ifaces ifaces; | |
439 | ifaces.count = 0; | |
440 | ifaces.len = 4; | |
441 | ifaces.list = (jclass *) _Jv_Malloc (ifaces.len | |
442 | * sizeof (jclass *)); | |
443 | ||
0006c7b0 | 444 | get_interfaces (owner, &ifaces); |
36739040 TT |
445 | |
446 | for (int i = 0; i < ifaces.count; i++) | |
447 | { | |
448 | jclass cls = ifaces.list[i]; | |
449 | the_method = search_method_in_class (cls, klass, method_name, | |
450 | method_signature); | |
451 | if (the_method != 0) | |
452 | { | |
453 | found_class = cls; | |
454 | break; | |
455 | } | |
456 | } | |
457 | ||
458 | _Jv_Free (ifaces.list); | |
459 | ||
460 | if (the_method != 0) | |
461 | goto end_of_method_search; | |
462 | } | |
463 | ||
464 | // Finally, search superclasses. | |
465 | for (jclass cls = owner->getSuperclass (); cls != 0; | |
466 | cls = cls->getSuperclass ()) | |
467 | { | |
468 | the_method = search_method_in_class (cls, klass, method_name, | |
469 | method_signature); | |
470 | if (the_method != 0) | |
471 | { | |
472 | found_class = cls; | |
473 | break; | |
474 | } | |
475 | } | |
476 | ||
477 | end_of_method_search: | |
478 | ||
479 | // FIXME: if (cls->loader != klass->loader), then we | |
480 | // must actually check that the types of arguments | |
481 | // correspond. That is, for each argument type, and | |
482 | // the return type, doing _Jv_FindClassFromSignature | |
483 | // with either loader should produce the same result, | |
484 | // i.e., exactly the same jclass object. JVMS 5.4.3.3 | |
485 | ||
486 | if (the_method == 0) | |
487 | { | |
488 | java::lang::StringBuffer *sb = new java::lang::StringBuffer(); | |
489 | sb->append(JvNewStringLatin1("method ")); | |
490 | sb->append(owner->getName()); | |
491 | sb->append(JvNewStringLatin1(".")); | |
492 | sb->append(_Jv_NewStringUTF(method_name->chars())); | |
493 | sb->append(JvNewStringLatin1(" with signature ")); | |
494 | sb->append(_Jv_NewStringUTF(method_signature->chars())); | |
495 | sb->append(JvNewStringLatin1(" was not found.")); | |
496 | throw new java::lang::NoSuchMethodError (sb->toString()); | |
497 | } | |
498 | ||
36739040 TT |
499 | pool->data[index].rmethod |
500 | = klass->engine->resolve_method(the_method, | |
501 | found_class, | |
502 | ((the_method->accflags | |
23bc3a89 | 503 | & Modifier::STATIC) != 0)); |
36739040 TT |
504 | pool->tags[index] |= JV_CONSTANT_ResolvedFlag; |
505 | } | |
506 | break; | |
507 | } | |
508 | return pool->data[index]; | |
509 | } | |
510 | ||
511 | // This function is used to lazily locate superclasses and | |
512 | // superinterfaces. This must be called with the class lock held. | |
513 | void | |
514 | _Jv_Linker::resolve_class_ref (jclass klass, jclass *classref) | |
515 | { | |
516 | jclass ret = *classref; | |
517 | ||
518 | // If superclass looks like a constant pool entry, resolve it now. | |
519 | if (ret && (uaddr) ret < (uaddr) klass->constants.size) | |
520 | { | |
521 | if (klass->state < JV_STATE_LINKED) | |
522 | { | |
523 | _Jv_Utf8Const *name = klass->constants.data[(uaddr) *classref].utf8; | |
524 | ret = _Jv_FindClass (name, klass->loader); | |
525 | if (! ret) | |
526 | { | |
527 | throw new java::lang::NoClassDefFoundError (name->toString()); | |
528 | } | |
529 | } | |
530 | else | |
531 | ret = klass->constants.data[(uaddr) classref].clazz; | |
532 | *classref = ret; | |
533 | } | |
534 | } | |
535 | ||
536 | // Find a method declared in the cls that is referenced from klass and | |
537 | // perform access checks. | |
538 | _Jv_Method * | |
539 | _Jv_Linker::search_method_in_class (jclass cls, jclass klass, | |
540 | _Jv_Utf8Const *method_name, | |
541 | _Jv_Utf8Const *method_signature) | |
542 | { | |
543 | using namespace java::lang::reflect; | |
544 | ||
545 | for (int i = 0; i < cls->method_count; i++) | |
546 | { | |
547 | _Jv_Method *method = &cls->methods[i]; | |
548 | if ( (!_Jv_equalUtf8Consts (method->name, | |
549 | method_name)) | |
550 | || (!_Jv_equalUtf8Consts (method->signature, | |
551 | method_signature))) | |
552 | continue; | |
553 | ||
554 | if (_Jv_CheckAccess (klass, cls, method->accflags)) | |
555 | return method; | |
556 | else | |
557 | { | |
558 | java::lang::StringBuffer *sb = new java::lang::StringBuffer(); | |
559 | sb->append(klass->getName()); | |
560 | sb->append(JvNewStringLatin1(": ")); | |
561 | sb->append(cls->getName()); | |
562 | sb->append(JvNewStringLatin1(".")); | |
563 | sb->append(_Jv_NewStringUTF(method_name->chars())); | |
564 | sb->append(_Jv_NewStringUTF(method_signature->chars())); | |
565 | throw new java::lang::IllegalAccessError (sb->toString()); | |
566 | } | |
567 | } | |
568 | return 0; | |
569 | } | |
570 | ||
571 | ||
572 | #define INITIAL_IOFFSETS_LEN 4 | |
573 | #define INITIAL_IFACES_LEN 4 | |
574 | ||
a286e145 | 575 | static _Jv_IDispatchTable null_idt = {SHRT_MAX, 0, {}}; |
36739040 TT |
576 | |
577 | // Generate tables for constant-time assignment testing and interface | |
578 | // method lookup. This implements the technique described by Per Bothner | |
579 | // <per@bothner.com> on the java-discuss mailing list on 1999-09-02: | |
580 | // http://gcc.gnu.org/ml/java/1999-q3/msg00377.html | |
581 | void | |
582 | _Jv_Linker::prepare_constant_time_tables (jclass klass) | |
583 | { | |
584 | if (klass->isPrimitive () || klass->isInterface ()) | |
585 | return; | |
586 | ||
587 | // Short-circuit in case we've been called already. | |
588 | if ((klass->idt != NULL) || klass->depth != 0) | |
589 | return; | |
590 | ||
591 | // Calculate the class depth and ancestor table. The depth of a class | |
592 | // is how many "extends" it is removed from Object. Thus the depth of | |
593 | // java.lang.Object is 0, but the depth of java.io.FilterOutputStream | |
594 | // is 2. Depth is defined for all regular and array classes, but not | |
595 | // interfaces or primitive types. | |
596 | ||
597 | jclass klass0 = klass; | |
598 | jboolean has_interfaces = 0; | |
599 | while (klass0 != &java::lang::Object::class$) | |
600 | { | |
601 | has_interfaces += klass0->interface_count; | |
602 | klass0 = klass0->superclass; | |
603 | klass->depth++; | |
604 | } | |
605 | ||
606 | // We do class member testing in constant time by using a small table | |
607 | // of all the ancestor classes within each class. The first element is | |
608 | // a pointer to the current class, and the rest are pointers to the | |
609 | // classes ancestors, ordered from the current class down by decreasing | |
610 | // depth. We do not include java.lang.Object in the table of ancestors, | |
8b1753e3 TT |
611 | // since it is redundant. Note that the classes pointed to by |
612 | // 'ancestors' will always be reachable by other paths. | |
36739040 | 613 | |
8b1753e3 | 614 | klass->ancestors = (jclass *) _Jv_AllocBytes (klass->depth |
36739040 TT |
615 | * sizeof (jclass)); |
616 | klass0 = klass; | |
617 | for (int index = 0; index < klass->depth; index++) | |
618 | { | |
619 | klass->ancestors[index] = klass0; | |
620 | klass0 = klass0->superclass; | |
621 | } | |
622 | ||
623 | if ((klass->accflags & java::lang::reflect::Modifier::ABSTRACT) != 0) | |
624 | return; | |
625 | ||
626 | // Optimization: If class implements no interfaces, use a common | |
627 | // predefined interface table. | |
628 | if (!has_interfaces) | |
629 | { | |
630 | klass->idt = &null_idt; | |
631 | return; | |
632 | } | |
633 | ||
36739040 TT |
634 | _Jv_ifaces ifaces; |
635 | ifaces.count = 0; | |
636 | ifaces.len = INITIAL_IFACES_LEN; | |
637 | ifaces.list = (jclass *) _Jv_Malloc (ifaces.len * sizeof (jclass *)); | |
638 | ||
639 | int itable_size = get_interfaces (klass, &ifaces); | |
640 | ||
641 | if (ifaces.count > 0) | |
642 | { | |
8b1753e3 TT |
643 | // The classes pointed to by the itable will always be reachable |
644 | // via other paths. | |
a286e145 BM |
645 | int idt_bytes = sizeof (_Jv_IDispatchTable) + (itable_size |
646 | * sizeof (void *)); | |
647 | klass->idt = (_Jv_IDispatchTable *) _Jv_AllocBytes (idt_bytes); | |
648 | klass->idt->itable_length = itable_size; | |
36739040 TT |
649 | |
650 | jshort *itable_offsets = | |
651 | (jshort *) _Jv_Malloc (ifaces.count * sizeof (jshort)); | |
652 | ||
653 | generate_itable (klass, &ifaces, itable_offsets); | |
654 | ||
655 | jshort cls_iindex = find_iindex (ifaces.list, itable_offsets, | |
656 | ifaces.count); | |
657 | ||
658 | for (int i = 0; i < ifaces.count; i++) | |
659 | { | |
a286e145 | 660 | ifaces.list[i]->ioffsets[cls_iindex] = itable_offsets[i]; |
36739040 TT |
661 | } |
662 | ||
a286e145 | 663 | klass->idt->iindex = cls_iindex; |
36739040 TT |
664 | |
665 | _Jv_Free (ifaces.list); | |
666 | _Jv_Free (itable_offsets); | |
667 | } | |
668 | else | |
669 | { | |
a286e145 | 670 | klass->idt->iindex = SHRT_MAX; |
36739040 TT |
671 | } |
672 | } | |
673 | ||
674 | // Return index of item in list, or -1 if item is not present. | |
675 | inline jshort | |
676 | _Jv_Linker::indexof (void *item, void **list, jshort list_len) | |
677 | { | |
678 | for (int i=0; i < list_len; i++) | |
679 | { | |
680 | if (list[i] == item) | |
681 | return i; | |
682 | } | |
683 | return -1; | |
684 | } | |
685 | ||
686 | // Find all unique interfaces directly or indirectly implemented by klass. | |
687 | // Returns the size of the interface dispatch table (itable) for klass, which | |
688 | // is the number of unique interfaces plus the total number of methods that | |
689 | // those interfaces declare. May extend ifaces if required. | |
690 | jshort | |
691 | _Jv_Linker::get_interfaces (jclass klass, _Jv_ifaces *ifaces) | |
692 | { | |
693 | jshort result = 0; | |
694 | ||
695 | for (int i = 0; i < klass->interface_count; i++) | |
696 | { | |
697 | jclass iface = klass->interfaces[i]; | |
698 | ||
699 | /* Make sure interface is linked. */ | |
700 | wait_for_state(iface, JV_STATE_LINKED); | |
701 | ||
702 | if (indexof (iface, (void **) ifaces->list, ifaces->count) == -1) | |
703 | { | |
704 | if (ifaces->count + 1 >= ifaces->len) | |
705 | { | |
706 | /* Resize ifaces list */ | |
707 | ifaces->len = ifaces->len * 2; | |
708 | ifaces->list | |
709 | = (jclass *) _Jv_Realloc (ifaces->list, | |
710 | ifaces->len * sizeof(jclass)); | |
711 | } | |
712 | ifaces->list[ifaces->count] = iface; | |
713 | ifaces->count++; | |
714 | ||
715 | result += get_interfaces (klass->interfaces[i], ifaces); | |
716 | } | |
717 | } | |
88200a8d | 718 | |
36739040 | 719 | if (klass->isInterface()) |
88200a8d TT |
720 | { |
721 | // We want to add 1 plus the number of interface methods here. | |
722 | // But, we take special care to skip <clinit>. | |
723 | ++result; | |
724 | for (int i = 0; i < klass->method_count; ++i) | |
725 | { | |
726 | if (klass->methods[i].name->first() != '<') | |
727 | ++result; | |
728 | } | |
729 | } | |
36739040 TT |
730 | else if (klass->superclass) |
731 | result += get_interfaces (klass->superclass, ifaces); | |
732 | return result; | |
733 | } | |
734 | ||
735 | // Fill out itable in klass, resolving method declarations in each ifaces. | |
736 | // itable_offsets is filled out with the position of each iface in itable, | |
737 | // such that itable[itable_offsets[n]] == ifaces.list[n]. | |
738 | void | |
739 | _Jv_Linker::generate_itable (jclass klass, _Jv_ifaces *ifaces, | |
740 | jshort *itable_offsets) | |
741 | { | |
a286e145 | 742 | void **itable = klass->idt->itable; |
36739040 TT |
743 | jshort itable_pos = 0; |
744 | ||
745 | for (int i = 0; i < ifaces->count; i++) | |
746 | { | |
747 | jclass iface = ifaces->list[i]; | |
748 | itable_offsets[i] = itable_pos; | |
749 | itable_pos = append_partial_itable (klass, iface, itable, itable_pos); | |
750 | ||
a286e145 BM |
751 | /* Create ioffsets table for iface */ |
752 | if (iface->ioffsets == NULL) | |
36739040 | 753 | { |
36739040 | 754 | // The first element of ioffsets is its length (itself included). |
8b1753e3 TT |
755 | jshort *ioffsets = (jshort *) _Jv_AllocBytes (INITIAL_IOFFSETS_LEN |
756 | * sizeof (jshort)); | |
36739040 TT |
757 | ioffsets[0] = INITIAL_IOFFSETS_LEN; |
758 | for (int i = 1; i < INITIAL_IOFFSETS_LEN; i++) | |
759 | ioffsets[i] = -1; | |
760 | ||
a286e145 | 761 | iface->ioffsets = ioffsets; |
36739040 TT |
762 | } |
763 | } | |
764 | } | |
765 | ||
766 | // Format method name for use in error messages. | |
767 | jstring | |
2a2c6e55 TT |
768 | _Jv_GetMethodString (jclass klass, _Jv_Method *meth, |
769 | jclass derived) | |
36739040 | 770 | { |
2a2c6e55 TT |
771 | using namespace java::lang; |
772 | StringBuffer *buf = new StringBuffer (klass->name->toString()); | |
773 | buf->append (jchar ('.')); | |
774 | buf->append (meth->name->toString()); | |
775 | buf->append ((jchar) ' '); | |
776 | buf->append (meth->signature->toString()); | |
777 | if (derived) | |
778 | { | |
779 | buf->append(JvNewStringLatin1(" in ")); | |
780 | buf->append(derived->name->toString()); | |
781 | } | |
782 | return buf->toString(); | |
36739040 TT |
783 | } |
784 | ||
c1a9321f | 785 | void |
36739040 TT |
786 | _Jv_ThrowNoSuchMethodError () |
787 | { | |
788 | throw new java::lang::NoSuchMethodError; | |
789 | } | |
790 | ||
a7f3ff76 | 791 | #ifdef USE_LIBFFI |
c1a9321f RS |
792 | // A function whose invocation is prepared using libffi. It gets called |
793 | // whenever a static method of a missing class is invoked. The data argument | |
794 | // holds a reference to a String denoting the missing class. | |
795 | // The prepared function call is stored in a class' atable. | |
796 | void | |
797 | _Jv_ThrowNoClassDefFoundErrorTrampoline(ffi_cif *, | |
798 | void *, | |
799 | void **, | |
800 | void *data) | |
801 | { | |
a7f3ff76 | 802 | throw new java::lang::NoClassDefFoundError( |
592fb510 | 803 | _Jv_NewStringUtf8Const((_Jv_Utf8Const *) data)); |
c1a9321f | 804 | } |
a7f3ff76 RS |
805 | #else |
806 | // A variant of the NoClassDefFoundError throwing method that can | |
807 | // be used without libffi. | |
c1a9321f RS |
808 | void |
809 | _Jv_ThrowNoClassDefFoundError() | |
810 | { | |
811 | throw new java::lang::NoClassDefFoundError(); | |
812 | } | |
a7f3ff76 | 813 | #endif |
c1a9321f | 814 | |
9edd0f5e AH |
815 | // Throw a NoSuchFieldError. Called by compiler-generated code when |
816 | // an otable entry is zero. OTABLE_INDEX is the index in the caller's | |
817 | // otable that refers to the missing field. This index may be used to | |
818 | // print diagnostic information about the field. | |
819 | void | |
820 | _Jv_ThrowNoSuchFieldError (int /* otable_index */) | |
821 | { | |
822 | throw new java::lang::NoSuchFieldError; | |
823 | } | |
824 | ||
fc544c81 | 825 | // This is put in empty vtable slots. |
fbb4c46b TT |
826 | void |
827 | _Jv_ThrowAbstractMethodError () | |
fc544c81 TT |
828 | { |
829 | throw new java::lang::AbstractMethodError(); | |
830 | } | |
831 | ||
36739040 TT |
832 | // Each superinterface of a class (i.e. each interface that the class |
833 | // directly or indirectly implements) has a corresponding "Partial | |
834 | // Interface Dispatch Table" whose size is (number of methods + 1) words. | |
835 | // The first word is a pointer to the interface (i.e. the java.lang.Class | |
836 | // instance for that interface). The remaining words are pointers to the | |
837 | // actual methods that implement the methods declared in the interface, | |
838 | // in order of declaration. | |
839 | // | |
840 | // Append partial interface dispatch table for "iface" to "itable", at | |
841 | // position itable_pos. | |
842 | // Returns the offset at which the next partial ITable should be appended. | |
843 | jshort | |
844 | _Jv_Linker::append_partial_itable (jclass klass, jclass iface, | |
88200a8d | 845 | void **itable, jshort pos) |
36739040 TT |
846 | { |
847 | using namespace java::lang::reflect; | |
848 | ||
849 | itable[pos++] = (void *) iface; | |
850 | _Jv_Method *meth; | |
851 | ||
852 | for (int j=0; j < iface->method_count; j++) | |
853 | { | |
88200a8d TT |
854 | // Skip '<clinit>' here. |
855 | if (iface->methods[j].name->first() == '<') | |
856 | continue; | |
857 | ||
36739040 TT |
858 | meth = NULL; |
859 | for (jclass cl = klass; cl; cl = cl->getSuperclass()) | |
860 | { | |
861 | meth = _Jv_GetMethodLocal (cl, iface->methods[j].name, | |
862 | iface->methods[j].signature); | |
863 | ||
864 | if (meth) | |
865 | break; | |
866 | } | |
867 | ||
88200a8d | 868 | if (meth) |
36739040 TT |
869 | { |
870 | if ((meth->accflags & Modifier::STATIC) != 0) | |
871 | throw new java::lang::IncompatibleClassChangeError | |
2a2c6e55 | 872 | (_Jv_GetMethodString (klass, meth)); |
36739040 TT |
873 | if ((meth->accflags & Modifier::PUBLIC) == 0) |
874 | throw new java::lang::IllegalAccessError | |
2a2c6e55 | 875 | (_Jv_GetMethodString (klass, meth)); |
36739040 | 876 | |
fc544c81 | 877 | if ((meth->accflags & Modifier::ABSTRACT) != 0) |
fbb4c46b | 878 | itable[pos] = (void *) &_Jv_ThrowAbstractMethodError; |
fc544c81 TT |
879 | else |
880 | itable[pos] = meth->ncode; | |
36739040 TT |
881 | } |
882 | else | |
883 | { | |
884 | // The method doesn't exist in klass. Binary compatibility rules | |
885 | // permit this, so we delay the error until runtime using a pointer | |
886 | // to a method which throws an exception. | |
887 | itable[pos] = (void *) _Jv_ThrowNoSuchMethodError; | |
888 | } | |
889 | pos++; | |
890 | } | |
891 | ||
892 | return pos; | |
893 | } | |
894 | ||
895 | static _Jv_Mutex_t iindex_mutex; | |
896 | static bool iindex_mutex_initialized = false; | |
897 | ||
898 | // We need to find the correct offset in the Class Interface Dispatch | |
899 | // Table for a given interface. Once we have that, invoking an interface | |
900 | // method just requires combining the Method's index in the interface | |
901 | // (known at compile time) to get the correct method. Doing a type test | |
902 | // (cast or instanceof) is the same problem: Once we have a possible Partial | |
903 | // Interface Dispatch Table, we just compare the first element to see if it | |
904 | // matches the desired interface. So how can we find the correct offset? | |
905 | // Our solution is to keep a vector of candiate offsets in each interface | |
a286e145 BM |
906 | // (ioffsets), and in each class we have an index (idt->iindex) used to |
907 | // select the correct offset from ioffsets. | |
36739040 TT |
908 | // |
909 | // Calculate and return iindex for a new class. | |
910 | // ifaces is a vector of num interfaces that the class implements. | |
911 | // offsets[j] is the offset in the interface dispatch table for the | |
912 | // interface corresponding to ifaces[j]. | |
913 | // May extend the interface ioffsets if required. | |
914 | jshort | |
915 | _Jv_Linker::find_iindex (jclass *ifaces, jshort *offsets, jshort num) | |
916 | { | |
917 | int i; | |
918 | int j; | |
919 | ||
920 | // Acquire a global lock to prevent itable corruption in case of multiple | |
921 | // classes that implement an intersecting set of interfaces being linked | |
922 | // simultaneously. We can assume that the mutex will be initialized | |
923 | // single-threaded. | |
924 | if (! iindex_mutex_initialized) | |
925 | { | |
926 | _Jv_MutexInit (&iindex_mutex); | |
927 | iindex_mutex_initialized = true; | |
928 | } | |
929 | ||
930 | _Jv_MutexLock (&iindex_mutex); | |
931 | ||
932 | for (i=1;; i++) /* each potential position in ioffsets */ | |
933 | { | |
934 | for (j=0;; j++) /* each iface */ | |
935 | { | |
936 | if (j >= num) | |
937 | goto found; | |
a286e145 | 938 | if (i >= ifaces[j]->ioffsets[0]) |
36739040 | 939 | continue; |
a286e145 | 940 | int ioffset = ifaces[j]->ioffsets[i]; |
36739040 TT |
941 | /* We can potentially share this position with another class. */ |
942 | if (ioffset >= 0 && ioffset != offsets[j]) | |
943 | break; /* Nope. Try next i. */ | |
944 | } | |
945 | } | |
946 | found: | |
947 | for (j = 0; j < num; j++) | |
948 | { | |
a286e145 | 949 | int len = ifaces[j]->ioffsets[0]; |
36739040 TT |
950 | if (i >= len) |
951 | { | |
952 | // Resize ioffsets. | |
953 | int newlen = 2 * len; | |
954 | if (i >= newlen) | |
955 | newlen = i + 3; | |
a286e145 BM |
956 | |
957 | jshort *old_ioffsets = ifaces[j]->ioffsets; | |
8b1753e3 TT |
958 | jshort *new_ioffsets = (jshort *) _Jv_AllocBytes (newlen |
959 | * sizeof(jshort)); | |
36739040 TT |
960 | memcpy (&new_ioffsets[1], &old_ioffsets[1], |
961 | (len - 1) * sizeof (jshort)); | |
962 | new_ioffsets[0] = newlen; | |
963 | ||
964 | while (len < newlen) | |
965 | new_ioffsets[len++] = -1; | |
966 | ||
a286e145 | 967 | ifaces[j]->ioffsets = new_ioffsets; |
36739040 | 968 | } |
a286e145 | 969 | ifaces[j]->ioffsets[i] = offsets[j]; |
36739040 TT |
970 | } |
971 | ||
972 | _Jv_MutexUnlock (&iindex_mutex); | |
973 | ||
974 | return i; | |
975 | } | |
976 | ||
8b1753e3 | 977 | #ifdef USE_LIBFFI |
8b1753e3 TT |
978 | // We use a structure of this type to store the closure that |
979 | // represents a missing method. | |
980 | struct method_closure | |
981 | { | |
982 | // This field must come first, since the address of this field will | |
983 | // be the same as the address of the overall structure. This is due | |
984 | // to disabling interior pointers in the GC. | |
985 | ffi_closure closure; | |
986 | ffi_cif cif; | |
987 | ffi_type *arg_types[1]; | |
988 | }; | |
989 | ||
a7f3ff76 RS |
990 | void * |
991 | _Jv_Linker::create_error_method (_Jv_Utf8Const *class_name) | |
992 | { | |
8b1753e3 TT |
993 | method_closure *closure |
994 | = (method_closure *) _Jv_AllocBytes(sizeof (method_closure)); | |
995 | ||
996 | closure->arg_types[0] = &ffi_type_void; | |
997 | ||
998 | // Initializes the cif and the closure. If that worked the closure | |
999 | // is returned and can be used as a function pointer in a class' | |
1000 | // atable. | |
592fb510 RS |
1001 | if ( ffi_prep_cif (&closure->cif, |
1002 | FFI_DEFAULT_ABI, | |
1003 | 1, | |
1004 | &ffi_type_void, | |
1005 | closure->arg_types) == FFI_OK | |
1006 | && ffi_prep_closure (&closure->closure, | |
1007 | &closure->cif, | |
8b1753e3 TT |
1008 | _Jv_ThrowNoClassDefFoundErrorTrampoline, |
1009 | class_name) == FFI_OK) | |
1010 | return &closure->closure; | |
1011 | else | |
a7f3ff76 RS |
1012 | { |
1013 | java::lang::StringBuffer *buffer = new java::lang::StringBuffer(); | |
8b1753e3 TT |
1014 | buffer->append(JvNewStringLatin1("Error setting up FFI closure" |
1015 | " for static method of" | |
1016 | " missing class: ")); | |
a7f3ff76 | 1017 | buffer->append (_Jv_NewStringUtf8Const(class_name)); |
a7f3ff76 RS |
1018 | throw new java::lang::InternalError(buffer->toString()); |
1019 | } | |
592fb510 | 1020 | } |
a7f3ff76 | 1021 | #else |
592fb510 RS |
1022 | void * |
1023 | _Jv_Linker::create_error_method (_Jv_Utf8Const *) | |
1024 | { | |
a7f3ff76 RS |
1025 | // Codepath for platforms which do not support (or want) libffi. |
1026 | // You have to accept that it is impossible to provide the name | |
1027 | // of the missing class then. | |
e3e1fa67 | 1028 | return (void *) _Jv_ThrowNoClassDefFoundError; |
a7f3ff76 | 1029 | } |
592fb510 | 1030 | #endif // USE_LIBFFI |
a7f3ff76 | 1031 | |
36739040 TT |
1032 | // Functions for indirect dispatch (symbolic virtual binding) support. |
1033 | ||
1034 | // There are three tables, atable otable and itable. atable is an | |
1035 | // array of addresses, and otable is an array of offsets, and these | |
1036 | // are used for static and virtual members respectively. itable is an | |
1037 | // array of pairs {address, index} where each address is a pointer to | |
1038 | // an interface. | |
1039 | ||
1040 | // {a,o,i}table_syms is an array of _Jv_MethodSymbols. Each such | |
1041 | // symbol is a tuple of {classname, member name, signature}. | |
1042 | ||
1043 | // Set this to true to enable debugging of indirect dispatch tables/linking. | |
1044 | static bool debug_link = false; | |
1045 | ||
1046 | // link_symbol_table() scans these two arrays and fills in the | |
1047 | // corresponding atable and otable with the addresses of static | |
1048 | // members and the offsets of virtual members. | |
1049 | ||
1050 | // The offset (in bytes) for each resolved method or field is placed | |
1051 | // at the corresponding position in the virtual method offset table | |
1052 | // (klass->otable). | |
1053 | ||
1054 | // The same otable and atable may be shared by many classes. | |
1055 | ||
1056 | // This must be called while holding the class lock. | |
1057 | ||
1058 | void | |
1059 | _Jv_Linker::link_symbol_table (jclass klass) | |
1060 | { | |
1061 | int index = 0; | |
1062 | _Jv_MethodSymbol sym; | |
1063 | if (klass->otable == NULL | |
1064 | || klass->otable->state != 0) | |
1065 | goto atable; | |
1066 | ||
1067 | klass->otable->state = 1; | |
1068 | ||
1069 | if (debug_link) | |
1070 | fprintf (stderr, "Fixing up otable in %s:\n", klass->name->chars()); | |
1071 | for (index = 0; | |
1072 | (sym = klass->otable_syms[index]).class_name != NULL; | |
1073 | ++index) | |
1074 | { | |
1075 | jclass target_class = _Jv_FindClass (sym.class_name, klass->loader); | |
1076 | _Jv_Method *meth = NULL; | |
1077 | ||
1078 | _Jv_Utf8Const *signature = sym.signature; | |
1079 | ||
36739040 TT |
1080 | if (target_class == NULL) |
1081 | throw new java::lang::NoClassDefFoundError | |
1082 | (_Jv_NewStringUTF (sym.class_name->chars())); | |
1083 | ||
1084 | // We're looking for a field or a method, and we can tell | |
1085 | // which is needed by looking at the signature. | |
1086 | if (signature->first() == '(' && signature->len() >= 2) | |
1087 | { | |
1088 | // Looks like someone is trying to invoke an interface method | |
1089 | if (target_class->isInterface()) | |
1090 | { | |
1091 | using namespace java::lang; | |
1092 | StringBuffer *sb = new StringBuffer(); | |
1093 | sb->append(JvNewStringLatin1("found interface ")); | |
1094 | sb->append(target_class->getName()); | |
1095 | sb->append(JvNewStringLatin1(" when searching for a class")); | |
1096 | throw new VerifyError(sb->toString()); | |
1097 | } | |
1098 | ||
1099 | // If the target class does not have a vtable_method_count yet, | |
1100 | // then we can't tell the offsets for its methods, so we must lay | |
1101 | // it out now. | |
1102 | wait_for_state(target_class, JV_STATE_PREPARED); | |
1103 | ||
1104 | meth = _Jv_LookupDeclaredMethod(target_class, sym.name, | |
1105 | sym.signature); | |
1106 | ||
9edd0f5e AH |
1107 | // Every class has a throwNoSuchMethodErrorIndex method that |
1108 | // it inherits from java.lang.Object. Find its vtable | |
1109 | // offset. | |
1110 | static int throwNoSuchMethodErrorIndex; | |
1111 | if (throwNoSuchMethodErrorIndex == 0) | |
36739040 | 1112 | { |
9edd0f5e AH |
1113 | Utf8Const* name |
1114 | = _Jv_makeUtf8Const ("throwNoSuchMethodError", | |
1115 | strlen ("throwNoSuchMethodError")); | |
1116 | _Jv_Method* meth | |
1117 | = _Jv_LookupDeclaredMethod (&java::lang::Object::class$, | |
1118 | name, gcj::void_signature); | |
1119 | throwNoSuchMethodErrorIndex | |
1120 | = _Jv_VTable::idx_to_offset (meth->index); | |
36739040 | 1121 | } |
9edd0f5e AH |
1122 | |
1123 | // If we don't find a nonstatic method, insert the | |
1124 | // vtable index of Object.throwNoSuchMethodError(). | |
1125 | // This defers the missing method error until an attempt | |
1126 | // is made to execute it. | |
1127 | { | |
1128 | int offset; | |
1129 | ||
1130 | if (meth != NULL) | |
1131 | offset = _Jv_VTable::idx_to_offset (meth->index); | |
1132 | else | |
1133 | offset = throwNoSuchMethodErrorIndex; | |
1134 | ||
1135 | if (offset == -1) | |
1136 | JvFail ("Bad method index"); | |
1137 | JvAssert (meth->index < target_class->vtable_method_count); | |
1138 | ||
1139 | klass->otable->offsets[index] = offset; | |
1140 | } | |
1141 | ||
36739040 TT |
1142 | if (debug_link) |
1143 | fprintf (stderr, " offsets[%d] = %d (class %s@%p : %s(%s))\n", | |
1144 | (int)index, | |
1145 | (int)klass->otable->offsets[index], | |
1146 | (const char*)target_class->name->chars(), | |
1147 | target_class, | |
1148 | (const char*)sym.name->chars(), | |
1149 | (const char*)signature->chars()); | |
1150 | continue; | |
1151 | } | |
1152 | ||
0006c7b0 | 1153 | // Try fields. |
36739040 | 1154 | { |
36739040 | 1155 | wait_for_state(target_class, JV_STATE_PREPARED); |
f3dc41fe | 1156 | jclass found_class; |
9edd0f5e AH |
1157 | _Jv_Field *the_field = NULL; |
1158 | try | |
1159 | { | |
1160 | the_field = find_field (klass, target_class, &found_class, | |
1161 | sym.name, sym.signature); | |
1162 | if ((the_field->flags & java::lang::reflect::Modifier::STATIC)) | |
1163 | throw new java::lang::IncompatibleClassChangeError; | |
1164 | else | |
1165 | klass->otable->offsets[index] = the_field->u.boffset; | |
1166 | } | |
1167 | catch (java::lang::NoSuchFieldError *err) | |
1168 | { | |
1169 | klass->otable->offsets[index] = 0; | |
1170 | } | |
36739040 TT |
1171 | } |
1172 | } | |
1173 | ||
1174 | atable: | |
1175 | if (klass->atable == NULL || klass->atable->state != 0) | |
1176 | goto itable; | |
1177 | ||
1178 | klass->atable->state = 1; | |
1179 | ||
1180 | for (index = 0; | |
1181 | (sym = klass->atable_syms[index]).class_name != NULL; | |
1182 | ++index) | |
1183 | { | |
c1a9321f RS |
1184 | jclass target_class = |
1185 | _Jv_FindClassNoException (sym.class_name, klass->loader); | |
1186 | ||
36739040 TT |
1187 | _Jv_Method *meth = NULL; |
1188 | _Jv_Utf8Const *signature = sym.signature; | |
1189 | ||
1190 | // ??? Setting this pointer to null will at least get us a | |
1191 | // NullPointerException | |
1192 | klass->atable->addresses[index] = NULL; | |
c1a9321f RS |
1193 | |
1194 | // If the target class is missing we prepare a function call | |
1195 | // that throws a NoClassDefFoundError and store the address of | |
1196 | // that newly prepare method in the atable. The user can run | |
1197 | // code in classes where the missing class is part of the | |
1198 | // execution environment as long as it is never referenced. | |
36739040 | 1199 | if (target_class == NULL) |
a7f3ff76 | 1200 | klass->atable->addresses[index] = create_error_method(sym.class_name); |
36739040 TT |
1201 | // We're looking for a static field or a static method, and we |
1202 | // can tell which is needed by looking at the signature. | |
c1a9321f | 1203 | else if (signature->first() == '(' && signature->len() >= 2) |
36739040 TT |
1204 | { |
1205 | // If the target class does not have a vtable_method_count yet, | |
1206 | // then we can't tell the offsets for its methods, so we must lay | |
1207 | // it out now. | |
1208 | wait_for_state (target_class, JV_STATE_PREPARED); | |
1209 | ||
1210 | // Interface methods cannot have bodies. | |
1211 | if (target_class->isInterface()) | |
1212 | { | |
1213 | using namespace java::lang; | |
1214 | StringBuffer *sb = new StringBuffer(); | |
1215 | sb->append(JvNewStringLatin1("class ")); | |
1216 | sb->append(target_class->getName()); | |
1217 | sb->append(JvNewStringLatin1(" is an interface: " | |
1218 | "class expected")); | |
1219 | throw new VerifyError(sb->toString()); | |
1220 | } | |
1221 | ||
1222 | meth = _Jv_LookupDeclaredMethod(target_class, sym.name, | |
1223 | sym.signature); | |
1224 | ||
1225 | if (meth != NULL) | |
1226 | { | |
1227 | if (meth->ncode) // Maybe abstract? | |
1228 | { | |
1229 | klass->atable->addresses[index] = meth->ncode; | |
1230 | if (debug_link) | |
1231 | fprintf (stderr, " addresses[%d] = %p (class %s@%p : %s(%s))\n", | |
1232 | index, | |
1233 | &klass->atable->addresses[index], | |
1234 | (const char*)target_class->name->chars(), | |
1235 | klass, | |
1236 | (const char*)sym.name->chars(), | |
1237 | (const char*)signature->chars()); | |
1238 | } | |
1239 | } | |
1240 | else | |
1241 | klass->atable->addresses[index] | |
a7f3ff76 | 1242 | = create_error_method(sym.class_name); |
36739040 TT |
1243 | |
1244 | continue; | |
1245 | } | |
1246 | ||
c1a9321f | 1247 | // Try fields only if the target class exists. |
592fb510 | 1248 | if (target_class != NULL) |
36739040 | 1249 | { |
36739040 | 1250 | wait_for_state(target_class, JV_STATE_PREPARED); |
f3dc41fe AH |
1251 | jclass found_class; |
1252 | _Jv_Field *the_field = find_field (klass, target_class, &found_class, | |
0006c7b0 TT |
1253 | sym.name, sym.signature); |
1254 | if ((the_field->flags & java::lang::reflect::Modifier::STATIC)) | |
1255 | klass->atable->addresses[index] = the_field->u.addr; | |
36739040 | 1256 | else |
0006c7b0 | 1257 | throw new java::lang::IncompatibleClassChangeError; |
36739040 TT |
1258 | } |
1259 | } | |
1260 | ||
1261 | itable: | |
1262 | if (klass->itable == NULL | |
1263 | || klass->itable->state != 0) | |
1264 | return; | |
1265 | ||
1266 | klass->itable->state = 1; | |
1267 | ||
1268 | for (index = 0; | |
1269 | (sym = klass->itable_syms[index]).class_name != NULL; | |
1270 | ++index) | |
1271 | { | |
1272 | jclass target_class = _Jv_FindClass (sym.class_name, klass->loader); | |
1273 | _Jv_Utf8Const *signature = sym.signature; | |
1274 | ||
1275 | jclass cls; | |
1276 | int i; | |
1277 | ||
1278 | wait_for_state(target_class, JV_STATE_LOADED); | |
1279 | bool found = _Jv_getInterfaceMethod (target_class, cls, i, | |
1280 | sym.name, sym.signature); | |
1281 | ||
1282 | if (found) | |
1283 | { | |
1284 | klass->itable->addresses[index * 2] = cls; | |
67bbb1e1 | 1285 | klass->itable->addresses[index * 2 + 1] = (void *)(unsigned long) i; |
36739040 TT |
1286 | if (debug_link) |
1287 | { | |
1288 | fprintf (stderr, " interfaces[%d] = %p (interface %s@%p : %s(%s))\n", | |
1289 | index, | |
1290 | klass->itable->addresses[index * 2], | |
1291 | (const char*)cls->name->chars(), | |
1292 | cls, | |
1293 | (const char*)sym.name->chars(), | |
1294 | (const char*)signature->chars()); | |
1295 | fprintf (stderr, " [%d] = offset %d\n", | |
1296 | index + 1, | |
67bbb1e1 | 1297 | (int)(unsigned long)klass->itable->addresses[index * 2 + 1]); |
36739040 TT |
1298 | } |
1299 | ||
1300 | } | |
1301 | else | |
1302 | throw new java::lang::IncompatibleClassChangeError; | |
1303 | } | |
1304 | ||
1305 | } | |
1306 | ||
1307 | // For each catch_record in the list of caught classes, fill in the | |
1308 | // address field. | |
1309 | void | |
1310 | _Jv_Linker::link_exception_table (jclass self) | |
1311 | { | |
1312 | struct _Jv_CatchClass *catch_record = self->catch_classes; | |
1313 | if (!catch_record || catch_record->classname) | |
1314 | return; | |
1315 | catch_record++; | |
1316 | while (catch_record->classname) | |
1317 | { | |
1318 | try | |
1319 | { | |
1320 | jclass target_class | |
1321 | = _Jv_FindClass (catch_record->classname, | |
1322 | self->getClassLoaderInternal ()); | |
1323 | *catch_record->address = target_class; | |
1324 | } | |
1325 | catch (::java::lang::Throwable *t) | |
1326 | { | |
1327 | // FIXME: We need to do something better here. | |
1328 | *catch_record->address = 0; | |
1329 | } | |
1330 | catch_record++; | |
1331 | } | |
1332 | self->catch_classes->classname = (_Jv_Utf8Const *)-1; | |
1333 | } | |
1334 | ||
36739040 TT |
1335 | // Set itable method indexes for members of interface IFACE. |
1336 | void | |
1337 | _Jv_Linker::layout_interface_methods (jclass iface) | |
1338 | { | |
1339 | if (! iface->isInterface()) | |
1340 | return; | |
1341 | ||
1342 | // itable indexes start at 1. | |
1343 | // FIXME: Static initalizers currently get a NULL placeholder entry in the | |
1344 | // itable so they are also assigned an index here. | |
1345 | for (int i = 0; i < iface->method_count; i++) | |
1346 | iface->methods[i].index = i + 1; | |
1347 | } | |
1348 | ||
1349 | // Prepare virtual method declarations in KLASS, and any superclasses | |
1350 | // as required, by determining their vtable index, setting | |
1351 | // method->index, and finally setting the class's vtable_method_count. | |
1352 | // Must be called with the lock for KLASS held. | |
1353 | void | |
1354 | _Jv_Linker::layout_vtable_methods (jclass klass) | |
1355 | { | |
1356 | if (klass->vtable != NULL || klass->isInterface() | |
1357 | || klass->vtable_method_count != -1) | |
1358 | return; | |
1359 | ||
1360 | jclass superclass = klass->getSuperclass(); | |
1361 | ||
1362 | if (superclass != NULL && superclass->vtable_method_count == -1) | |
1363 | { | |
1364 | JvSynchronize sync (superclass); | |
1365 | layout_vtable_methods (superclass); | |
1366 | } | |
1367 | ||
1368 | int index = (superclass == NULL ? 0 : superclass->vtable_method_count); | |
1369 | ||
1370 | for (int i = 0; i < klass->method_count; ++i) | |
1371 | { | |
1372 | _Jv_Method *meth = &klass->methods[i]; | |
1373 | _Jv_Method *super_meth = NULL; | |
1374 | ||
1375 | if (! _Jv_isVirtualMethod (meth)) | |
1376 | continue; | |
1377 | ||
1378 | if (superclass != NULL) | |
1379 | { | |
1380 | jclass declarer; | |
1381 | super_meth = _Jv_LookupDeclaredMethod (superclass, meth->name, | |
1382 | meth->signature, &declarer); | |
1383 | // See if this method actually overrides the other method | |
1384 | // we've found. | |
1385 | if (super_meth) | |
1386 | { | |
1387 | if (! _Jv_isVirtualMethod (super_meth) | |
1388 | || ! _Jv_CheckAccess (klass, declarer, | |
1389 | super_meth->accflags)) | |
1390 | super_meth = NULL; | |
1391 | else if ((super_meth->accflags | |
1392 | & java::lang::reflect::Modifier::FINAL) != 0) | |
1393 | { | |
1394 | using namespace java::lang; | |
1395 | StringBuffer *sb = new StringBuffer(); | |
1396 | sb->append(JvNewStringLatin1("method ")); | |
2a2c6e55 | 1397 | sb->append(_Jv_GetMethodString(klass, meth)); |
36739040 | 1398 | sb->append(JvNewStringLatin1(" overrides final method ")); |
2a2c6e55 | 1399 | sb->append(_Jv_GetMethodString(declarer, super_meth)); |
36739040 TT |
1400 | throw new VerifyError(sb->toString()); |
1401 | } | |
1402 | } | |
1403 | } | |
1404 | ||
1405 | if (super_meth) | |
1406 | meth->index = super_meth->index; | |
1407 | else | |
1408 | meth->index = index++; | |
1409 | } | |
1410 | ||
1411 | klass->vtable_method_count = index; | |
1412 | } | |
1413 | ||
1414 | // Set entries in VTABLE for virtual methods declared in KLASS. | |
1415 | void | |
1416 | _Jv_Linker::set_vtable_entries (jclass klass, _Jv_VTable *vtable) | |
1417 | { | |
1418 | for (int i = klass->method_count - 1; i >= 0; i--) | |
1419 | { | |
1420 | using namespace java::lang::reflect; | |
1421 | ||
1422 | _Jv_Method *meth = &klass->methods[i]; | |
1423 | if (meth->index == (_Jv_ushort) -1) | |
1424 | continue; | |
1425 | if ((meth->accflags & Modifier::ABSTRACT)) | |
fc544c81 TT |
1426 | // FIXME: it might be nice to have a libffi trampoline here, |
1427 | // so we could pass in the method name and other information. | |
fbb4c46b TT |
1428 | vtable->set_method(meth->index, |
1429 | (void *) &_Jv_ThrowAbstractMethodError); | |
36739040 TT |
1430 | else |
1431 | vtable->set_method(meth->index, meth->ncode); | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | // Allocate and lay out the virtual method table for KLASS. This will | |
1436 | // also cause vtables to be generated for any non-abstract | |
1437 | // superclasses, and virtual method layout to occur for any abstract | |
1438 | // superclasses. Must be called with monitor lock for KLASS held. | |
1439 | void | |
1440 | _Jv_Linker::make_vtable (jclass klass) | |
1441 | { | |
1442 | using namespace java::lang::reflect; | |
1443 | ||
1444 | // If the vtable exists, or for interface classes, do nothing. All | |
1445 | // other classes, including abstract classes, need a vtable. | |
1446 | if (klass->vtable != NULL || klass->isInterface()) | |
1447 | return; | |
1448 | ||
1449 | // Ensure all the `ncode' entries are set. | |
1450 | klass->engine->create_ncode(klass); | |
1451 | ||
1452 | // Class must be laid out before we can create a vtable. | |
1453 | if (klass->vtable_method_count == -1) | |
1454 | layout_vtable_methods (klass); | |
1455 | ||
1456 | // Allocate the new vtable. | |
1457 | _Jv_VTable *vtable = _Jv_VTable::new_vtable (klass->vtable_method_count); | |
1458 | klass->vtable = vtable; | |
1459 | ||
1460 | // Copy the vtable of the closest superclass. | |
1461 | jclass superclass = klass->superclass; | |
1462 | { | |
1463 | JvSynchronize sync (superclass); | |
1464 | make_vtable (superclass); | |
1465 | } | |
1466 | for (int i = 0; i < superclass->vtable_method_count; ++i) | |
1467 | vtable->set_method (i, superclass->vtable->get_method (i)); | |
1468 | ||
1469 | // Set the class pointer and GC descriptor. | |
1470 | vtable->clas = klass; | |
1471 | vtable->gc_descr = _Jv_BuildGCDescr (klass); | |
1472 | ||
1473 | // For each virtual declared in klass, set new vtable entry or | |
1474 | // override an old one. | |
1475 | set_vtable_entries (klass, vtable); | |
1476 | ||
fc544c81 TT |
1477 | // Note that we don't check for abstract methods here. We used to, |
1478 | // but there is a JVMS clarification that indicates that a check | |
1479 | // here would be too eager. And, a simple test case confirms this. | |
36739040 TT |
1480 | } |
1481 | ||
1482 | // Lay out the class, allocating space for static fields and computing | |
1483 | // offsets of instance fields. The class lock must be held by the | |
1484 | // caller. | |
1485 | void | |
1486 | _Jv_Linker::ensure_fields_laid_out (jclass klass) | |
1487 | { | |
1488 | if (klass->size_in_bytes != -1) | |
1489 | return; | |
1490 | ||
1491 | // Compute the alignment for this type by searching through the | |
1492 | // superclasses and finding the maximum required alignment. We | |
1493 | // could consider caching this in the Class. | |
1494 | int max_align = __alignof__ (java::lang::Object); | |
1495 | jclass super = klass->getSuperclass(); | |
1496 | while (super != NULL) | |
1497 | { | |
1498 | // Ensure that our super has its super installed before | |
1499 | // recursing. | |
1500 | wait_for_state(super, JV_STATE_LOADING); | |
1501 | ensure_fields_laid_out(super); | |
1502 | int num = JvNumInstanceFields (super); | |
1503 | _Jv_Field *field = JvGetFirstInstanceField (super); | |
1504 | while (num > 0) | |
1505 | { | |
1506 | int field_align = get_alignment_from_class (field->type); | |
1507 | if (field_align > max_align) | |
1508 | max_align = field_align; | |
1509 | ++field; | |
1510 | --num; | |
1511 | } | |
1512 | super = super->getSuperclass(); | |
1513 | } | |
1514 | ||
1515 | int instance_size; | |
8b1753e3 TT |
1516 | // This is the size of the 'static' non-reference fields. |
1517 | int non_reference_size = 0; | |
1518 | // This is the size of the 'static' reference fields. We count | |
1519 | // these separately to make it simpler for the GC to scan them. | |
1520 | int reference_size = 0; | |
36739040 TT |
1521 | |
1522 | // Although java.lang.Object is never interpreted, an interface can | |
1523 | // have a null superclass. Note that we have to lay out an | |
1524 | // interface because it might have static fields. | |
1525 | if (klass->superclass) | |
1526 | instance_size = klass->superclass->size(); | |
1527 | else | |
1528 | instance_size = java::lang::Object::class$.size(); | |
1529 | ||
fdafd461 AH |
1530 | klass->engine->allocate_field_initializers (klass); |
1531 | ||
36739040 TT |
1532 | for (int i = 0; i < klass->field_count; i++) |
1533 | { | |
1534 | int field_size; | |
1535 | int field_align; | |
1536 | ||
1537 | _Jv_Field *field = &klass->fields[i]; | |
1538 | ||
1539 | if (! field->isRef ()) | |
1540 | { | |
1541 | // It is safe to resolve the field here, since it's a | |
1542 | // primitive class, which does not cause loading to happen. | |
1543 | resolve_field (field, klass->loader); | |
36739040 TT |
1544 | field_size = field->type->size (); |
1545 | field_align = get_alignment_from_class (field->type); | |
1546 | } | |
1547 | else | |
1548 | { | |
1549 | field_size = sizeof (jobject); | |
1550 | field_align = __alignof__ (jobject); | |
1551 | } | |
1552 | ||
1553 | field->bsize = field_size; | |
1554 | ||
1555 | if ((field->flags & java::lang::reflect::Modifier::STATIC)) | |
1556 | { | |
1557 | if (field->u.addr == NULL) | |
1558 | { | |
1559 | // This computes an offset into a region we'll allocate | |
8b1753e3 | 1560 | // shortly, and then adds this offset to the start |
36739040 | 1561 | // address. |
8b1753e3 TT |
1562 | if (field->isRef()) |
1563 | { | |
1564 | reference_size = ROUND (reference_size, field_align); | |
1565 | field->u.boffset = reference_size; | |
1566 | reference_size += field_size; | |
1567 | } | |
1568 | else | |
1569 | { | |
1570 | non_reference_size = ROUND (non_reference_size, field_align); | |
1571 | field->u.boffset = non_reference_size; | |
1572 | non_reference_size += field_size; | |
1573 | } | |
36739040 TT |
1574 | } |
1575 | } | |
1576 | else | |
1577 | { | |
1578 | instance_size = ROUND (instance_size, field_align); | |
1579 | field->u.boffset = instance_size; | |
1580 | instance_size += field_size; | |
1581 | if (field_align > max_align) | |
1582 | max_align = field_align; | |
1583 | } | |
1584 | } | |
1585 | ||
8b1753e3 TT |
1586 | if (reference_size != 0 || non_reference_size != 0) |
1587 | klass->engine->allocate_static_fields (klass, reference_size, | |
1588 | non_reference_size); | |
36739040 TT |
1589 | |
1590 | // Set the instance size for the class. Note that first we round it | |
1591 | // to the alignment required for this object; this keeps us in sync | |
1592 | // with our current ABI. | |
1593 | instance_size = ROUND (instance_size, max_align); | |
1594 | klass->size_in_bytes = instance_size; | |
1595 | } | |
1596 | ||
1597 | // This takes the class to state JV_STATE_LINKED. The class lock must | |
1598 | // be held when calling this. | |
1599 | void | |
1600 | _Jv_Linker::ensure_class_linked (jclass klass) | |
1601 | { | |
1602 | if (klass->state >= JV_STATE_LINKED) | |
1603 | return; | |
1604 | ||
1605 | int state = klass->state; | |
1606 | try | |
1607 | { | |
1608 | // Short-circuit, so that mutually dependent classes are ok. | |
1609 | klass->state = JV_STATE_LINKED; | |
1610 | ||
1611 | _Jv_Constants *pool = &klass->constants; | |
1612 | ||
1613 | // Compiled classes require that their class constants be | |
1614 | // resolved here. However, interpreted classes need their | |
1615 | // constants to be resolved lazily. If we resolve an | |
1616 | // interpreted class' constants eagerly, we can end up with | |
1617 | // spurious IllegalAccessErrors when the constant pool contains | |
1618 | // a reference to a class we can't access. This can validly | |
1619 | // occur in an obscure case involving the InnerClasses | |
1620 | // attribute. | |
1621 | if (! _Jv_IsInterpretedClass (klass)) | |
1622 | { | |
1623 | // Resolve class constants first, since other constant pool | |
1624 | // entries may rely on these. | |
1625 | for (int index = 1; index < pool->size; ++index) | |
1626 | { | |
1627 | if (pool->tags[index] == JV_CONSTANT_Class) | |
c1a9321f RS |
1628 | // Lazily resolve the entries. |
1629 | resolve_pool_entry (klass, index, true); | |
36739040 TT |
1630 | } |
1631 | } | |
1632 | ||
36739040 TT |
1633 | // Resolve the remaining constant pool entries. |
1634 | for (int index = 1; index < pool->size; ++index) | |
1635 | { | |
1636 | if (pool->tags[index] == JV_CONSTANT_String) | |
1637 | { | |
1638 | jstring str; | |
1639 | ||
1640 | str = _Jv_NewStringUtf8Const (pool->data[index].utf8); | |
1641 | pool->data[index].o = str; | |
1642 | pool->tags[index] |= JV_CONSTANT_ResolvedFlag; | |
1643 | } | |
1644 | } | |
1645 | ||
1646 | if (klass->engine->need_resolve_string_fields()) | |
1647 | { | |
1648 | jfieldID f = JvGetFirstStaticField (klass); | |
1649 | for (int n = JvNumStaticFields (klass); n > 0; --n) | |
1650 | { | |
1651 | int mod = f->getModifiers (); | |
1652 | // If we have a static String field with a non-null initial | |
1653 | // value, we know it points to a Utf8Const. | |
c1a9321f RS |
1654 | |
1655 | // Finds out whether we have to initialize a String without the | |
1656 | // need to resolve the field. | |
1657 | if ((f->isResolved() | |
1658 | ? (f->type == &java::lang::String::class$) | |
1659 | : _Jv_equalUtf8Classnames((_Jv_Utf8Const *) f->type, | |
1660 | java::lang::String::class$.name)) | |
36739040 TT |
1661 | && (mod & java::lang::reflect::Modifier::STATIC) != 0) |
1662 | { | |
1663 | jstring *strp = (jstring *) f->u.addr; | |
1664 | if (*strp) | |
1665 | *strp = _Jv_NewStringUtf8Const ((_Jv_Utf8Const *) *strp); | |
1666 | } | |
1667 | f = f->getNextField (); | |
1668 | } | |
1669 | } | |
1670 | ||
1671 | klass->notifyAll (); | |
1672 | ||
1673 | _Jv_PushClass (klass); | |
1674 | } | |
1675 | catch (java::lang::Throwable *t) | |
1676 | { | |
1677 | klass->state = state; | |
1678 | throw t; | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | // This ensures that symbolic superclass and superinterface references | |
1683 | // are resolved for the indicated class. This must be called with the | |
1684 | // class lock held. | |
1685 | void | |
1686 | _Jv_Linker::ensure_supers_installed (jclass klass) | |
1687 | { | |
1688 | resolve_class_ref (klass, &klass->superclass); | |
1689 | // An interface won't have a superclass. | |
1690 | if (klass->superclass) | |
1691 | wait_for_state (klass->superclass, JV_STATE_LOADING); | |
1692 | ||
1693 | for (int i = 0; i < klass->interface_count; ++i) | |
1694 | { | |
1695 | resolve_class_ref (klass, &klass->interfaces[i]); | |
1696 | wait_for_state (klass->interfaces[i], JV_STATE_LOADING); | |
1697 | } | |
1698 | } | |
1699 | ||
1700 | // This adds missing `Miranda methods' to a class. | |
1701 | void | |
1702 | _Jv_Linker::add_miranda_methods (jclass base, jclass iface_class) | |
1703 | { | |
1704 | // Note that at this point, all our supers, and the supers of all | |
1705 | // our superclasses and superinterfaces, will have been installed. | |
1706 | ||
1707 | for (int i = 0; i < iface_class->interface_count; ++i) | |
1708 | { | |
1709 | jclass interface = iface_class->interfaces[i]; | |
1710 | ||
1711 | for (int j = 0; j < interface->method_count; ++j) | |
1712 | { | |
1713 | _Jv_Method *meth = &interface->methods[j]; | |
1714 | // Don't bother with <clinit>. | |
1715 | if (meth->name->first() == '<') | |
1716 | continue; | |
1717 | _Jv_Method *new_meth = _Jv_LookupDeclaredMethod (base, meth->name, | |
1718 | meth->signature); | |
1719 | if (! new_meth) | |
1720 | { | |
1721 | // We assume that such methods are very unlikely, so we | |
1722 | // just reallocate the method array each time one is | |
1723 | // found. This greatly simplifies the searching -- | |
1724 | // otherwise we have to make sure that each such method | |
1725 | // found is really unique among all superinterfaces. | |
1726 | int new_count = base->method_count + 1; | |
1727 | _Jv_Method *new_m | |
8b1753e3 TT |
1728 | = (_Jv_Method *) _Jv_AllocRawObj (sizeof (_Jv_Method) |
1729 | * new_count); | |
36739040 TT |
1730 | memcpy (new_m, base->methods, |
1731 | sizeof (_Jv_Method) * base->method_count); | |
1732 | ||
1733 | // Add new method. | |
1734 | new_m[base->method_count] = *meth; | |
1735 | new_m[base->method_count].index = (_Jv_ushort) -1; | |
1736 | new_m[base->method_count].accflags | |
1737 | |= java::lang::reflect::Modifier::INVISIBLE; | |
1738 | ||
1739 | base->methods = new_m; | |
1740 | base->method_count = new_count; | |
1741 | } | |
1742 | } | |
1743 | ||
1744 | wait_for_state (interface, JV_STATE_LOADED); | |
1745 | add_miranda_methods (base, interface); | |
1746 | } | |
1747 | } | |
1748 | ||
1749 | // This ensures that the class' method table is "complete". This must | |
1750 | // be called with the class lock held. | |
1751 | void | |
1752 | _Jv_Linker::ensure_method_table_complete (jclass klass) | |
1753 | { | |
02f3e085 | 1754 | if (klass->vtable != NULL) |
36739040 TT |
1755 | return; |
1756 | ||
1757 | // We need our superclass to have its own Miranda methods installed. | |
02f3e085 AH |
1758 | if (! klass->isInterface()) |
1759 | wait_for_state (klass->getSuperclass (), JV_STATE_LOADED); | |
36739040 TT |
1760 | |
1761 | // A class might have so-called "Miranda methods". This is a method | |
1762 | // that is declared in an interface and not re-declared in an | |
1763 | // abstract class. Some compilers don't emit declarations for such | |
1764 | // methods in the class; this will give us problems since we expect | |
1765 | // a declaration for any method requiring a vtable entry. We handle | |
1766 | // this here by searching for such methods and constructing new | |
1767 | // internal declarations for them. Note that we do this | |
1768 | // unconditionally, and not just for abstract classes, to correctly | |
1769 | // account for cases where a class is modified to be concrete and | |
1770 | // still incorrectly inherits an abstract method. | |
1771 | int pre_count = klass->method_count; | |
1772 | add_miranda_methods (klass, klass); | |
1773 | ||
1774 | // Let the execution engine know that we've added methods. | |
1775 | if (klass->method_count != pre_count) | |
1776 | klass->engine->post_miranda_hook(klass); | |
1777 | } | |
1778 | ||
1779 | // Verify a class. Must be called with class lock held. | |
1780 | void | |
1781 | _Jv_Linker::verify_class (jclass klass) | |
1782 | { | |
1783 | klass->engine->verify(klass); | |
1784 | } | |
1785 | ||
1786 | // Check the assertions contained in the type assertion table for KLASS. | |
1787 | // This is the equivilent of bytecode verification for native, BC-ABI code. | |
1788 | void | |
1789 | _Jv_Linker::verify_type_assertions (jclass klass) | |
1790 | { | |
1791 | if (debug_link) | |
1792 | fprintf (stderr, "Evaluating type assertions for %s:\n", | |
1793 | klass->name->chars()); | |
1794 | ||
1795 | if (klass->assertion_table == NULL) | |
1796 | return; | |
1797 | ||
1798 | for (int i = 0;; i++) | |
1799 | { | |
1800 | int assertion_code = klass->assertion_table[i].assertion_code; | |
1801 | _Jv_Utf8Const *op1 = klass->assertion_table[i].op1; | |
1802 | _Jv_Utf8Const *op2 = klass->assertion_table[i].op2; | |
1803 | ||
1804 | if (assertion_code == JV_ASSERT_END_OF_TABLE) | |
1805 | return; | |
1806 | else if (assertion_code == JV_ASSERT_TYPES_COMPATIBLE) | |
1807 | { | |
1808 | if (debug_link) | |
1809 | { | |
1810 | fprintf (stderr, " code=%i, operand A=%s B=%s\n", | |
1811 | assertion_code, op1->chars(), op2->chars()); | |
1812 | } | |
1813 | ||
1814 | // The operands are class signatures. op1 is the source, | |
1815 | // op2 is the target. | |
1816 | jclass cl1 = _Jv_FindClassFromSignature (op1->chars(), | |
1817 | klass->getClassLoaderInternal()); | |
1818 | jclass cl2 = _Jv_FindClassFromSignature (op2->chars(), | |
1819 | klass->getClassLoaderInternal()); | |
1820 | ||
1821 | // If the class doesn't exist, ignore the assertion. An exception | |
1822 | // will be thrown later if an attempt is made to actually | |
1823 | // instantiate the class. | |
1824 | if (cl1 == NULL || cl2 == NULL) | |
1825 | continue; | |
1826 | ||
852993e3 | 1827 | if (! _Jv_IsAssignableFromSlow (cl1, cl2)) |
36739040 TT |
1828 | { |
1829 | jstring s = JvNewStringUTF ("Incompatible types: In class "); | |
1830 | s = s->concat (klass->getName()); | |
1831 | s = s->concat (JvNewStringUTF (": ")); | |
1832 | s = s->concat (cl1->getName()); | |
1833 | s = s->concat (JvNewStringUTF (" is not assignable to ")); | |
1834 | s = s->concat (cl2->getName()); | |
1835 | throw new java::lang::VerifyError (s); | |
1836 | } | |
1837 | } | |
1838 | else if (assertion_code == JV_ASSERT_IS_INSTANTIABLE) | |
1839 | { | |
1840 | // TODO: Implement this. | |
1841 | } | |
1842 | // Unknown assertion codes are ignored, for forwards-compatibility. | |
1843 | } | |
1844 | } | |
1845 | ||
1846 | void | |
1847 | _Jv_Linker::print_class_loaded (jclass klass) | |
1848 | { | |
1849 | char *codesource = NULL; | |
1850 | if (klass->protectionDomain != NULL) | |
1851 | { | |
1852 | java::security::CodeSource *cs | |
1853 | = klass->protectionDomain->getCodeSource(); | |
1854 | if (cs != NULL) | |
1855 | { | |
1856 | jstring css = cs->toString(); | |
1857 | int len = JvGetStringUTFLength(css); | |
1858 | codesource = (char *) _Jv_AllocBytes(len + 1); | |
1859 | JvGetStringUTFRegion(css, 0, css->length(), codesource); | |
1860 | codesource[len] = '\0'; | |
1861 | } | |
1862 | } | |
1863 | if (codesource == NULL) | |
2cf94e58 | 1864 | codesource = (char *) "<no code source>"; |
36739040 | 1865 | |
2cf94e58 | 1866 | const char *abi; |
36739040 TT |
1867 | if (_Jv_IsInterpretedClass (klass)) |
1868 | abi = "bytecode"; | |
97b51fd0 | 1869 | else if (_Jv_IsBinaryCompatibilityABI (klass)) |
36739040 TT |
1870 | abi = "BC-compiled"; |
1871 | else | |
1872 | abi = "pre-compiled"; | |
1873 | ||
1874 | fprintf (stderr, "[Loaded (%s) %s from %s]\n", abi, klass->name->chars(), | |
1875 | codesource); | |
1876 | } | |
1877 | ||
1878 | // FIXME: mention invariants and stuff. | |
1879 | void | |
1880 | _Jv_Linker::wait_for_state (jclass klass, int state) | |
1881 | { | |
1882 | if (klass->state >= state) | |
1883 | return; | |
1884 | ||
1885 | JvSynchronize sync (klass); | |
1886 | ||
1887 | // This is similar to the strategy for class initialization. If we | |
1888 | // already hold the lock, just leave. | |
1889 | java::lang::Thread *self = java::lang::Thread::currentThread(); | |
1890 | while (klass->state <= state | |
1891 | && klass->thread | |
1892 | && klass->thread != self) | |
1893 | klass->wait (); | |
1894 | ||
1895 | java::lang::Thread *save = klass->thread; | |
1896 | klass->thread = self; | |
1897 | ||
621ae65d AH |
1898 | // Allocate memory for static fields and constants. |
1899 | if (GC_base (klass) && klass->fields && ! GC_base (klass->fields)) | |
1900 | { | |
1901 | jsize count = klass->field_count; | |
1902 | if (count) | |
1903 | { | |
1904 | _Jv_Field* fields | |
1905 | = (_Jv_Field*) _Jv_AllocRawObj (count * sizeof (_Jv_Field)); | |
1906 | memcpy ((void*)fields, | |
1907 | (void*)klass->fields, | |
1908 | count * sizeof (_Jv_Field)); | |
1909 | klass->fields = fields; | |
1910 | } | |
1911 | } | |
1912 | ||
36739040 TT |
1913 | // Print some debugging info if requested. Interpreted classes are |
1914 | // handled in defineclass, so we only need to handle the two | |
1915 | // pre-compiled cases here. | |
1916 | if (gcj::verbose_class_flag | |
1917 | && (klass->state == JV_STATE_COMPILED | |
1918 | || klass->state == JV_STATE_PRELOADING) | |
f37a936b | 1919 | && ! _Jv_IsInterpretedClass (klass)) |
36739040 TT |
1920 | print_class_loaded (klass); |
1921 | ||
1922 | try | |
1923 | { | |
1924 | if (state >= JV_STATE_LOADING && klass->state < JV_STATE_LOADING) | |
1925 | { | |
1926 | ensure_supers_installed (klass); | |
1927 | klass->set_state(JV_STATE_LOADING); | |
1928 | } | |
1929 | ||
1930 | if (state >= JV_STATE_LOADED && klass->state < JV_STATE_LOADED) | |
1931 | { | |
1932 | ensure_method_table_complete (klass); | |
1933 | klass->set_state(JV_STATE_LOADED); | |
1934 | } | |
1935 | ||
1936 | if (state >= JV_STATE_PREPARED && klass->state < JV_STATE_PREPARED) | |
1937 | { | |
1938 | ensure_fields_laid_out (klass); | |
1939 | make_vtable (klass); | |
1940 | layout_interface_methods (klass); | |
1941 | prepare_constant_time_tables (klass); | |
1942 | klass->set_state(JV_STATE_PREPARED); | |
1943 | } | |
1944 | ||
1945 | if (state >= JV_STATE_LINKED && klass->state < JV_STATE_LINKED) | |
1946 | { | |
f5ea88a3 BM |
1947 | if (gcj::verifyClasses) |
1948 | verify_class (klass); | |
36739040 TT |
1949 | |
1950 | ensure_class_linked (klass); | |
1951 | link_exception_table (klass); | |
1952 | link_symbol_table (klass); | |
1953 | klass->set_state(JV_STATE_LINKED); | |
1954 | } | |
1955 | } | |
1956 | catch (java::lang::Throwable *exc) | |
1957 | { | |
1958 | klass->thread = save; | |
1959 | klass->set_state(JV_STATE_ERROR); | |
1960 | throw exc; | |
1961 | } | |
1962 | ||
1963 | klass->thread = save; | |
1964 | ||
1965 | if (klass->state == JV_STATE_ERROR) | |
1966 | throw new java::lang::LinkageError; | |
1967 | } |