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36739040 TT |
1 | // link.cc - Code for linking and resolving classes and pool entries. |
2 | ||
70a0694b AO |
3 | /* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
4 | Free Software Foundation | |
36739040 TT |
5 | |
6 | This file is part of libgcj. | |
7 | ||
8 | This software is copyrighted work licensed under the terms of the | |
9 | Libgcj License. Please consult the file "LIBGCJ_LICENSE" for | |
10 | details. */ | |
11 | ||
12 | /* Author: Kresten Krab Thorup <krab@gnu.org> */ | |
13 | ||
14 | #include <config.h> | |
15 | #include <platform.h> | |
16 | ||
7faf2821 HB |
17 | #include <stdio.h> |
18 | ||
1cfdf07f DD |
19 | #ifdef USE_LIBFFI |
20 | #include <ffi.h> | |
21 | #endif | |
22 | ||
36739040 TT |
23 | #include <java-interp.h> |
24 | ||
621ae65d AH |
25 | // Set GC_DEBUG before including gc.h! |
26 | #ifdef LIBGCJ_GC_DEBUG | |
27 | # define GC_DEBUG | |
28 | #endif | |
29 | #include <gc.h> | |
30 | ||
36739040 TT |
31 | #include <jvm.h> |
32 | #include <gcj/cni.h> | |
33 | #include <string.h> | |
7edc2bad | 34 | #include <limits.h> |
36739040 TT |
35 | #include <java-cpool.h> |
36 | #include <execution.h> | |
86acf60c | 37 | #ifdef INTERPRETER |
9ea6c4a4 KS |
38 | #include <jvmti.h> |
39 | #include "jvmti-int.h" | |
86acf60c | 40 | #endif |
36739040 TT |
41 | #include <java/lang/Class.h> |
42 | #include <java/lang/String.h> | |
43 | #include <java/lang/StringBuffer.h> | |
44 | #include <java/lang/Thread.h> | |
45 | #include <java/lang/InternalError.h> | |
46 | #include <java/lang/VirtualMachineError.h> | |
47 | #include <java/lang/VerifyError.h> | |
48 | #include <java/lang/NoSuchFieldError.h> | |
49 | #include <java/lang/NoSuchMethodError.h> | |
50 | #include <java/lang/ClassFormatError.h> | |
51 | #include <java/lang/IllegalAccessError.h> | |
c1a9321f | 52 | #include <java/lang/InternalError.h> |
36739040 TT |
53 | #include <java/lang/AbstractMethodError.h> |
54 | #include <java/lang/NoClassDefFoundError.h> | |
55 | #include <java/lang/IncompatibleClassChangeError.h> | |
56 | #include <java/lang/VerifyError.h> | |
57 | #include <java/lang/VMClassLoader.h> | |
58 | #include <java/lang/reflect/Modifier.h> | |
59 | #include <java/security/CodeSource.h> | |
60 | ||
61 | using namespace gcj; | |
62 | ||
36739040 TT |
63 | template<typename T> |
64 | struct aligner | |
65 | { | |
66 | char c; | |
67 | T field; | |
68 | }; | |
69 | ||
70 | #define ALIGNOF(TYPE) (offsetof (aligner<TYPE>, field)) | |
71 | ||
72 | // This returns the alignment of a type as it would appear in a | |
73 | // structure. This can be different from the alignment of the type | |
74 | // itself. For instance on x86 double is 8-aligned but struct{double} | |
75 | // is 4-aligned. | |
76 | int | |
77 | _Jv_Linker::get_alignment_from_class (jclass klass) | |
78 | { | |
79 | if (klass == JvPrimClass (byte)) | |
80 | return ALIGNOF (jbyte); | |
81 | else if (klass == JvPrimClass (short)) | |
82 | return ALIGNOF (jshort); | |
83 | else if (klass == JvPrimClass (int)) | |
84 | return ALIGNOF (jint); | |
85 | else if (klass == JvPrimClass (long)) | |
86 | return ALIGNOF (jlong); | |
87 | else if (klass == JvPrimClass (boolean)) | |
88 | return ALIGNOF (jboolean); | |
89 | else if (klass == JvPrimClass (char)) | |
90 | return ALIGNOF (jchar); | |
91 | else if (klass == JvPrimClass (float)) | |
92 | return ALIGNOF (jfloat); | |
93 | else if (klass == JvPrimClass (double)) | |
94 | return ALIGNOF (jdouble); | |
95 | else | |
96 | return ALIGNOF (jobject); | |
97 | } | |
98 | ||
99 | void | |
100 | _Jv_Linker::resolve_field (_Jv_Field *field, java::lang::ClassLoader *loader) | |
101 | { | |
102 | if (! field->isResolved ()) | |
103 | { | |
8b6e7690 TT |
104 | _Jv_Utf8Const *sig = (_Jv_Utf8Const *) field->type; |
105 | jclass type = _Jv_FindClassFromSignature (sig->chars(), loader); | |
106 | if (type == NULL) | |
107 | throw new java::lang::NoClassDefFoundError(field->name->toString()); | |
108 | field->type = type; | |
36739040 TT |
109 | field->flags &= ~_Jv_FIELD_UNRESOLVED_FLAG; |
110 | } | |
111 | } | |
112 | ||
0006c7b0 TT |
113 | // A helper for find_field that knows how to recursively search |
114 | // superclasses and interfaces. | |
115 | _Jv_Field * | |
116 | _Jv_Linker::find_field_helper (jclass search, _Jv_Utf8Const *name, | |
c1a9321f | 117 | _Jv_Utf8Const *type_name, jclass type, |
0006c7b0 TT |
118 | jclass *declarer) |
119 | { | |
120 | while (search) | |
121 | { | |
122 | // From 5.4.3.2. First search class itself. | |
123 | for (int i = 0; i < search->field_count; ++i) | |
124 | { | |
125 | _Jv_Field *field = &search->fields[i]; | |
21b23409 TT |
126 | if (! _Jv_equalUtf8Consts (field->name, name)) |
127 | continue; | |
128 | ||
c1a9321f RS |
129 | // Checks for the odd situation where we were able to retrieve the |
130 | // field's class from signature but the resolution of the field itself | |
131 | // failed which means a different class was resolved. | |
132 | if (type != NULL) | |
133 | { | |
134 | try | |
135 | { | |
136 | resolve_field (field, search->loader); | |
137 | } | |
138 | catch (java::lang::Throwable *exc) | |
139 | { | |
140 | java::lang::LinkageError *le = new java::lang::LinkageError | |
141 | (JvNewStringLatin1 | |
142 | ("field type mismatch with different loaders")); | |
143 | ||
144 | le->initCause(exc); | |
145 | ||
146 | throw le; | |
147 | } | |
148 | } | |
21b23409 TT |
149 | |
150 | // Note that we compare type names and not types. This is | |
151 | // bizarre, but we do it because we want to find a field | |
152 | // (and terminate the search) if it has the correct | |
153 | // descriptor -- but then later reject it if the class | |
154 | // loader check results in different classes. We can't just | |
155 | // pass in the descriptor and check that way, because when | |
156 | // the field is already resolved there is no easy way to | |
157 | // find its descriptor again. | |
592fb510 RS |
158 | if ((field->isResolved () |
159 | ? _Jv_equalUtf8Classnames (type_name, field->type->name) | |
160 | : _Jv_equalUtf8Classnames (type_name, | |
161 | (_Jv_Utf8Const *) field->type))) | |
0006c7b0 TT |
162 | { |
163 | *declarer = search; | |
164 | return field; | |
165 | } | |
166 | } | |
167 | ||
168 | // Next search direct interfaces. | |
169 | for (int i = 0; i < search->interface_count; ++i) | |
170 | { | |
171 | _Jv_Field *result = find_field_helper (search->interfaces[i], name, | |
c1a9321f | 172 | type_name, type, declarer); |
0006c7b0 TT |
173 | if (result) |
174 | return result; | |
175 | } | |
176 | ||
177 | // Now search superclass. | |
178 | search = search->superclass; | |
179 | } | |
180 | ||
181 | return NULL; | |
182 | } | |
183 | ||
e207dbea TT |
184 | bool |
185 | _Jv_Linker::has_field_p (jclass search, _Jv_Utf8Const *field_name) | |
186 | { | |
187 | for (int i = 0; i < search->field_count; ++i) | |
188 | { | |
189 | _Jv_Field *field = &search->fields[i]; | |
190 | if (_Jv_equalUtf8Consts (field->name, field_name)) | |
191 | return true; | |
192 | } | |
193 | return false; | |
194 | } | |
195 | ||
0006c7b0 TT |
196 | // Find a field. |
197 | // KLASS is the class that is requesting the field. | |
198 | // OWNER is the class in which the field should be found. | |
199 | // FIELD_TYPE_NAME is the type descriptor for the field. | |
f3dc41fe AH |
200 | // Fill FOUND_CLASS with the address of the class in which the field |
201 | // is actually declared. | |
0006c7b0 TT |
202 | // This function does the class loader type checks, and |
203 | // also access checks. Returns the field, or throws an | |
204 | // exception on error. | |
205 | _Jv_Field * | |
206 | _Jv_Linker::find_field (jclass klass, jclass owner, | |
f3dc41fe | 207 | jclass *found_class, |
0006c7b0 TT |
208 | _Jv_Utf8Const *field_name, |
209 | _Jv_Utf8Const *field_type_name) | |
210 | { | |
21b23409 TT |
211 | // FIXME: this allocates a _Jv_Utf8Const each time. We should make |
212 | // it cheaper. | |
c1a9321f RS |
213 | // Note: This call will resolve the primitive type names ("Z", "B", ...) to |
214 | // their Java counterparts ("boolean", "byte", ...) if accessed via | |
215 | // field_type->name later. Using these variants of the type name is in turn | |
216 | // important for the find_field_helper function. However if the class | |
217 | // resolution failed then we can only use the already given type name. | |
218 | jclass field_type | |
219 | = _Jv_FindClassFromSignatureNoException (field_type_name->chars(), | |
220 | klass->loader); | |
221 | ||
222 | _Jv_Field *the_field | |
223 | = find_field_helper (owner, field_name, | |
224 | (field_type | |
225 | ? field_type->name : | |
226 | field_type_name ), | |
227 | field_type, found_class); | |
0006c7b0 TT |
228 | |
229 | if (the_field == 0) | |
230 | { | |
231 | java::lang::StringBuffer *sb = new java::lang::StringBuffer(); | |
232 | sb->append(JvNewStringLatin1("field ")); | |
233 | sb->append(owner->getName()); | |
234 | sb->append(JvNewStringLatin1(".")); | |
235 | sb->append(_Jv_NewStringUTF(field_name->chars())); | |
236 | sb->append(JvNewStringLatin1(" was not found.")); | |
237 | throw new java::lang::NoSuchFieldError (sb->toString()); | |
238 | } | |
239 | ||
c1a9321f RS |
240 | // Accept it when the field's class could not be resolved. |
241 | if (field_type == NULL) | |
242 | // Silently ignore that we were not able to retrieve the type to make it | |
243 | // possible to run code which does not access this field. | |
244 | return the_field; | |
245 | ||
f3dc41fe | 246 | if (_Jv_CheckAccess (klass, *found_class, the_field->flags)) |
0006c7b0 | 247 | { |
21b23409 | 248 | // Note that the field returned by find_field_helper is always |
2599b56f TT |
249 | // resolved. However, we still use the constraint mechanism |
250 | // because this may affect other lookups. | |
2e95a6c3 | 251 | _Jv_CheckOrCreateLoadingConstraint (field_type, (*found_class)->loader); |
0006c7b0 TT |
252 | } |
253 | else | |
254 | { | |
255 | java::lang::StringBuffer *sb | |
256 | = new java::lang::StringBuffer (); | |
257 | sb->append(klass->getName()); | |
258 | sb->append(JvNewStringLatin1(": ")); | |
f3dc41fe | 259 | sb->append((*found_class)->getName()); |
0006c7b0 TT |
260 | sb->append(JvNewStringLatin1(".")); |
261 | sb->append(_Jv_NewStringUtf8Const (field_name)); | |
262 | throw new java::lang::IllegalAccessError(sb->toString()); | |
263 | } | |
264 | ||
265 | return the_field; | |
266 | } | |
267 | ||
2599b56f TT |
268 | // Check loading constraints for method. |
269 | void | |
270 | _Jv_Linker::check_loading_constraints (_Jv_Method *method, jclass self_class, | |
271 | jclass other_class) | |
272 | { | |
273 | JArray<jclass> *klass_args; | |
274 | jclass klass_return; | |
275 | ||
276 | _Jv_GetTypesFromSignature (method, self_class, &klass_args, &klass_return); | |
277 | jclass *klass_arg = elements (klass_args); | |
278 | java::lang::ClassLoader *found_loader = other_class->loader; | |
279 | ||
280 | _Jv_CheckOrCreateLoadingConstraint (klass_return, found_loader); | |
281 | for (int i = 0; i < klass_args->length; i++) | |
282 | _Jv_CheckOrCreateLoadingConstraint (*(klass_arg++), found_loader); | |
283 | } | |
284 | ||
97b8365c TT |
285 | _Jv_Method * |
286 | _Jv_Linker::resolve_method_entry (jclass klass, jclass &found_class, | |
287 | int class_index, int name_and_type_index, | |
288 | bool init, bool is_iface) | |
289 | { | |
290 | _Jv_Constants *pool = &klass->constants; | |
291 | jclass owner = resolve_pool_entry (klass, class_index).clazz; | |
292 | ||
293 | if (init && owner != klass) | |
294 | _Jv_InitClass (owner); | |
295 | ||
296 | _Jv_ushort name_index, type_index; | |
297 | _Jv_loadIndexes (&pool->data[name_and_type_index], | |
298 | name_index, | |
299 | type_index); | |
300 | ||
301 | _Jv_Utf8Const *method_name = pool->data[name_index].utf8; | |
302 | _Jv_Utf8Const *method_signature = pool->data[type_index].utf8; | |
303 | ||
304 | _Jv_Method *the_method = 0; | |
305 | found_class = 0; | |
306 | ||
307 | // We're going to cache a pointer to the _Jv_Method object | |
308 | // when we find it. So, to ensure this doesn't get moved from | |
309 | // beneath us, we first put all the needed Miranda methods | |
310 | // into the target class. | |
311 | wait_for_state (klass, JV_STATE_LOADED); | |
312 | ||
313 | // First search the class itself. | |
314 | the_method = search_method_in_class (owner, klass, | |
315 | method_name, method_signature); | |
316 | ||
317 | if (the_method != 0) | |
318 | { | |
319 | found_class = owner; | |
320 | goto end_of_method_search; | |
321 | } | |
322 | ||
323 | // If we are resolving an interface method, search the | |
324 | // interface's superinterfaces (A superinterface is not an | |
325 | // interface's superclass - a superinterface is implemented by | |
326 | // the interface). | |
327 | if (is_iface) | |
328 | { | |
329 | _Jv_ifaces ifaces; | |
330 | ifaces.count = 0; | |
331 | ifaces.len = 4; | |
332 | ifaces.list = (jclass *) _Jv_Malloc (ifaces.len | |
333 | * sizeof (jclass *)); | |
334 | ||
335 | get_interfaces (owner, &ifaces); | |
336 | ||
337 | for (int i = 0; i < ifaces.count; i++) | |
338 | { | |
339 | jclass cls = ifaces.list[i]; | |
340 | the_method = search_method_in_class (cls, klass, method_name, | |
341 | method_signature); | |
342 | if (the_method != 0) | |
343 | { | |
344 | found_class = cls; | |
345 | break; | |
346 | } | |
347 | } | |
348 | ||
349 | _Jv_Free (ifaces.list); | |
350 | ||
351 | if (the_method != 0) | |
352 | goto end_of_method_search; | |
353 | } | |
354 | ||
355 | // Finally, search superclasses. | |
356 | the_method = (search_method_in_superclasses | |
357 | (owner->getSuperclass (), klass, method_name, | |
358 | method_signature, &found_class)); | |
359 | ||
360 | ||
361 | end_of_method_search: | |
97b8365c TT |
362 | if (the_method == 0) |
363 | { | |
364 | java::lang::StringBuffer *sb = new java::lang::StringBuffer(); | |
365 | sb->append(JvNewStringLatin1("method ")); | |
366 | sb->append(owner->getName()); | |
367 | sb->append(JvNewStringLatin1(".")); | |
368 | sb->append(_Jv_NewStringUTF(method_name->chars())); | |
369 | sb->append(JvNewStringLatin1(" with signature ")); | |
370 | sb->append(_Jv_NewStringUTF(method_signature->chars())); | |
371 | sb->append(JvNewStringLatin1(" was not found.")); | |
372 | throw new java::lang::NoSuchMethodError (sb->toString()); | |
373 | } | |
374 | ||
2599b56f TT |
375 | // if (found_class->loader != klass->loader), then we must actually |
376 | // check that the types of arguments correspond. JVMS 5.4.3.3. | |
dec93f90 | 377 | if (found_class->loader != klass->loader) |
2599b56f | 378 | check_loading_constraints (the_method, klass, found_class); |
dec93f90 | 379 | |
97b8365c TT |
380 | return the_method; |
381 | } | |
382 | ||
e4493315 AH |
383 | _Jv_Mutex_t _Jv_Linker::resolve_mutex; |
384 | ||
385 | void | |
386 | _Jv_Linker::init (void) | |
387 | { | |
388 | _Jv_MutexInit (&_Jv_Linker::resolve_mutex); | |
389 | } | |
390 | ||
391 | // Locking in resolve_pool_entry is somewhat subtle. Constant | |
392 | // resolution is idempotent, so it doesn't matter if two threads | |
393 | // resolve the same entry. However, it is important that we always | |
394 | // write the resolved flag and the data together, atomically. It is | |
395 | // also important that we read them atomically. | |
36739040 | 396 | _Jv_word |
c1a9321f | 397 | _Jv_Linker::resolve_pool_entry (jclass klass, int index, bool lazy) |
36739040 TT |
398 | { |
399 | using namespace java::lang::reflect; | |
400 | ||
621ae65d AH |
401 | if (GC_base (klass) && klass->constants.data |
402 | && ! GC_base (klass->constants.data)) | |
e4493315 AH |
403 | // If a class is heap-allocated but the constant pool is not this |
404 | // is a "new ABI" class, i.e. one where the initial constant pool | |
405 | // is in the read-only data section of an object file. Copy the | |
406 | // initial constant pool from there to a new heap-allocated pool. | |
621ae65d AH |
407 | { |
408 | jsize count = klass->constants.size; | |
409 | if (count) | |
410 | { | |
411 | _Jv_word* constants | |
412 | = (_Jv_word*) _Jv_AllocRawObj (count * sizeof (_Jv_word)); | |
413 | memcpy ((void*)constants, | |
414 | (void*)klass->constants.data, | |
415 | count * sizeof (_Jv_word)); | |
416 | klass->constants.data = constants; | |
417 | } | |
418 | } | |
419 | ||
36739040 TT |
420 | _Jv_Constants *pool = &klass->constants; |
421 | ||
e4493315 AH |
422 | jbyte tags; |
423 | _Jv_word data; | |
424 | tags = read_cpool_entry (&data, pool, index); | |
36739040 | 425 | |
e4493315 AH |
426 | if ((tags & JV_CONSTANT_ResolvedFlag) != 0) |
427 | return data; | |
428 | ||
429 | switch (tags & ~JV_CONSTANT_LazyFlag) | |
36739040 TT |
430 | { |
431 | case JV_CONSTANT_Class: | |
432 | { | |
e4493315 | 433 | _Jv_Utf8Const *name = data.utf8; |
36739040 TT |
434 | |
435 | jclass found; | |
436 | if (name->first() == '[') | |
c1a9321f RS |
437 | found = _Jv_FindClassFromSignatureNoException (name->chars(), |
438 | klass->loader); | |
439 | else | |
440 | found = _Jv_FindClassNoException (name, klass->loader); | |
441 | ||
442 | // If the class could not be loaded a phantom class is created. Any | |
443 | // function that deals with such a class but cannot do something useful | |
444 | // with it should just throw a NoClassDefFoundError with the class' | |
445 | // name. | |
36739040 | 446 | if (! found) |
ea517ca5 TT |
447 | { |
448 | if (lazy) | |
449 | { | |
450 | found = _Jv_NewClass(name, NULL, NULL); | |
451 | found->state = JV_STATE_PHANTOM; | |
e4493315 AH |
452 | tags |= JV_CONSTANT_ResolvedFlag; |
453 | data.clazz = found; | |
ea517ca5 TT |
454 | break; |
455 | } | |
456 | else | |
457 | throw new java::lang::NoClassDefFoundError (name->toString()); | |
458 | } | |
36739040 TT |
459 | |
460 | // Check accessibility, but first strip array types as | |
461 | // _Jv_ClassNameSamePackage can't handle arrays. | |
462 | jclass check; | |
463 | for (check = found; | |
464 | check && check->isArray(); | |
465 | check = check->getComponentType()) | |
466 | ; | |
467 | if ((found->accflags & Modifier::PUBLIC) == Modifier::PUBLIC | |
468 | || (_Jv_ClassNameSamePackage (check->name, | |
469 | klass->name))) | |
470 | { | |
e4493315 AH |
471 | data.clazz = found; |
472 | tags |= JV_CONSTANT_ResolvedFlag; | |
36739040 TT |
473 | } |
474 | else | |
475 | { | |
476 | java::lang::StringBuffer *sb = new java::lang::StringBuffer (); | |
477 | sb->append(klass->getName()); | |
478 | sb->append(JvNewStringLatin1(" can't access class ")); | |
479 | sb->append(found->getName()); | |
480 | throw new java::lang::IllegalAccessError(sb->toString()); | |
481 | } | |
482 | } | |
483 | break; | |
484 | ||
485 | case JV_CONSTANT_String: | |
486 | { | |
487 | jstring str; | |
e4493315 AH |
488 | str = _Jv_NewStringUtf8Const (data.utf8); |
489 | data.o = str; | |
490 | tags |= JV_CONSTANT_ResolvedFlag; | |
36739040 TT |
491 | } |
492 | break; | |
493 | ||
494 | case JV_CONSTANT_Fieldref: | |
495 | { | |
496 | _Jv_ushort class_index, name_and_type_index; | |
e4493315 | 497 | _Jv_loadIndexes (&data, |
36739040 TT |
498 | class_index, |
499 | name_and_type_index); | |
c1a9321f RS |
500 | jclass owner = (resolve_pool_entry (klass, class_index, true)).clazz; |
501 | ||
502 | // If a phantom class was resolved our field reference is | |
503 | // unusable because of the missing class. | |
504 | if (owner->state == JV_STATE_PHANTOM) | |
505 | throw new java::lang::NoClassDefFoundError(owner->getName()); | |
36739040 | 506 | |
97b8365c TT |
507 | // We don't initialize 'owner', but we do make sure that its |
508 | // fields exist. | |
509 | wait_for_state (owner, JV_STATE_PREPARED); | |
36739040 TT |
510 | |
511 | _Jv_ushort name_index, type_index; | |
512 | _Jv_loadIndexes (&pool->data[name_and_type_index], | |
513 | name_index, | |
514 | type_index); | |
515 | ||
516 | _Jv_Utf8Const *field_name = pool->data[name_index].utf8; | |
517 | _Jv_Utf8Const *field_type_name = pool->data[type_index].utf8; | |
518 | ||
f3dc41fe AH |
519 | jclass found_class = 0; |
520 | _Jv_Field *the_field = find_field (klass, owner, | |
521 | &found_class, | |
522 | field_name, | |
0006c7b0 | 523 | field_type_name); |
97b8365c TT |
524 | // Initialize the field's declaring class, not its qualifying |
525 | // class. | |
526 | _Jv_InitClass (found_class); | |
e4493315 AH |
527 | data.field = the_field; |
528 | tags |= JV_CONSTANT_ResolvedFlag; | |
36739040 TT |
529 | } |
530 | break; | |
531 | ||
532 | case JV_CONSTANT_Methodref: | |
533 | case JV_CONSTANT_InterfaceMethodref: | |
534 | { | |
535 | _Jv_ushort class_index, name_and_type_index; | |
e4493315 | 536 | _Jv_loadIndexes (&data, |
36739040 TT |
537 | class_index, |
538 | name_and_type_index); | |
36739040 | 539 | |
97b8365c TT |
540 | _Jv_Method *the_method; |
541 | jclass found_class; | |
542 | the_method = resolve_method_entry (klass, found_class, | |
543 | class_index, name_and_type_index, | |
544 | true, | |
e4493315 | 545 | tags == JV_CONSTANT_InterfaceMethodref); |
36739040 | 546 | |
e4493315 | 547 | data.rmethod |
36739040 TT |
548 | = klass->engine->resolve_method(the_method, |
549 | found_class, | |
550 | ((the_method->accflags | |
23bc3a89 | 551 | & Modifier::STATIC) != 0)); |
e4493315 | 552 | tags |= JV_CONSTANT_ResolvedFlag; |
36739040 TT |
553 | } |
554 | break; | |
555 | } | |
e4493315 AH |
556 | |
557 | write_cpool_entry (data, tags, pool, index); | |
558 | ||
559 | return data; | |
36739040 TT |
560 | } |
561 | ||
562 | // This function is used to lazily locate superclasses and | |
563 | // superinterfaces. This must be called with the class lock held. | |
564 | void | |
565 | _Jv_Linker::resolve_class_ref (jclass klass, jclass *classref) | |
566 | { | |
567 | jclass ret = *classref; | |
568 | ||
569 | // If superclass looks like a constant pool entry, resolve it now. | |
570 | if (ret && (uaddr) ret < (uaddr) klass->constants.size) | |
571 | { | |
572 | if (klass->state < JV_STATE_LINKED) | |
573 | { | |
574 | _Jv_Utf8Const *name = klass->constants.data[(uaddr) *classref].utf8; | |
575 | ret = _Jv_FindClass (name, klass->loader); | |
576 | if (! ret) | |
577 | { | |
578 | throw new java::lang::NoClassDefFoundError (name->toString()); | |
579 | } | |
580 | } | |
581 | else | |
582 | ret = klass->constants.data[(uaddr) classref].clazz; | |
583 | *classref = ret; | |
584 | } | |
585 | } | |
586 | ||
587 | // Find a method declared in the cls that is referenced from klass and | |
297750da | 588 | // perform access checks if CHECK_PERMS is true. |
36739040 TT |
589 | _Jv_Method * |
590 | _Jv_Linker::search_method_in_class (jclass cls, jclass klass, | |
591 | _Jv_Utf8Const *method_name, | |
297750da AH |
592 | _Jv_Utf8Const *method_signature, |
593 | bool check_perms) | |
36739040 TT |
594 | { |
595 | using namespace java::lang::reflect; | |
596 | ||
597 | for (int i = 0; i < cls->method_count; i++) | |
598 | { | |
599 | _Jv_Method *method = &cls->methods[i]; | |
600 | if ( (!_Jv_equalUtf8Consts (method->name, | |
601 | method_name)) | |
602 | || (!_Jv_equalUtf8Consts (method->signature, | |
603 | method_signature))) | |
604 | continue; | |
605 | ||
297750da | 606 | if (!check_perms || _Jv_CheckAccess (klass, cls, method->accflags)) |
36739040 TT |
607 | return method; |
608 | else | |
609 | { | |
610 | java::lang::StringBuffer *sb = new java::lang::StringBuffer(); | |
611 | sb->append(klass->getName()); | |
612 | sb->append(JvNewStringLatin1(": ")); | |
613 | sb->append(cls->getName()); | |
614 | sb->append(JvNewStringLatin1(".")); | |
615 | sb->append(_Jv_NewStringUTF(method_name->chars())); | |
616 | sb->append(_Jv_NewStringUTF(method_signature->chars())); | |
617 | throw new java::lang::IllegalAccessError (sb->toString()); | |
618 | } | |
619 | } | |
620 | return 0; | |
621 | } | |
622 | ||
297750da AH |
623 | // Like search_method_in_class, but work our way up the superclass |
624 | // chain. | |
625 | _Jv_Method * | |
626 | _Jv_Linker::search_method_in_superclasses (jclass cls, jclass klass, | |
627 | _Jv_Utf8Const *method_name, | |
628 | _Jv_Utf8Const *method_signature, | |
629 | jclass *found_class, bool check_perms) | |
630 | { | |
631 | _Jv_Method *the_method = NULL; | |
632 | ||
633 | for ( ; cls != 0; cls = cls->getSuperclass ()) | |
634 | { | |
635 | the_method = search_method_in_class (cls, klass, method_name, | |
636 | method_signature, check_perms); | |
637 | if (the_method != 0) | |
638 | { | |
639 | if (found_class) | |
640 | *found_class = cls; | |
641 | break; | |
642 | } | |
643 | } | |
644 | ||
645 | return the_method; | |
646 | } | |
36739040 TT |
647 | |
648 | #define INITIAL_IOFFSETS_LEN 4 | |
649 | #define INITIAL_IFACES_LEN 4 | |
650 | ||
a286e145 | 651 | static _Jv_IDispatchTable null_idt = {SHRT_MAX, 0, {}}; |
36739040 TT |
652 | |
653 | // Generate tables for constant-time assignment testing and interface | |
654 | // method lookup. This implements the technique described by Per Bothner | |
655 | // <per@bothner.com> on the java-discuss mailing list on 1999-09-02: | |
656 | // http://gcc.gnu.org/ml/java/1999-q3/msg00377.html | |
657 | void | |
658 | _Jv_Linker::prepare_constant_time_tables (jclass klass) | |
659 | { | |
660 | if (klass->isPrimitive () || klass->isInterface ()) | |
661 | return; | |
662 | ||
663 | // Short-circuit in case we've been called already. | |
664 | if ((klass->idt != NULL) || klass->depth != 0) | |
665 | return; | |
666 | ||
667 | // Calculate the class depth and ancestor table. The depth of a class | |
668 | // is how many "extends" it is removed from Object. Thus the depth of | |
669 | // java.lang.Object is 0, but the depth of java.io.FilterOutputStream | |
670 | // is 2. Depth is defined for all regular and array classes, but not | |
671 | // interfaces or primitive types. | |
672 | ||
673 | jclass klass0 = klass; | |
70a0694b | 674 | jboolean has_interfaces = false; |
36739040 TT |
675 | while (klass0 != &java::lang::Object::class$) |
676 | { | |
70a0694b AO |
677 | if (klass0->interface_count) |
678 | has_interfaces = true; | |
36739040 TT |
679 | klass0 = klass0->superclass; |
680 | klass->depth++; | |
681 | } | |
682 | ||
683 | // We do class member testing in constant time by using a small table | |
684 | // of all the ancestor classes within each class. The first element is | |
685 | // a pointer to the current class, and the rest are pointers to the | |
686 | // classes ancestors, ordered from the current class down by decreasing | |
687 | // depth. We do not include java.lang.Object in the table of ancestors, | |
8b1753e3 TT |
688 | // since it is redundant. Note that the classes pointed to by |
689 | // 'ancestors' will always be reachable by other paths. | |
36739040 | 690 | |
8b1753e3 | 691 | klass->ancestors = (jclass *) _Jv_AllocBytes (klass->depth |
36739040 TT |
692 | * sizeof (jclass)); |
693 | klass0 = klass; | |
694 | for (int index = 0; index < klass->depth; index++) | |
695 | { | |
696 | klass->ancestors[index] = klass0; | |
697 | klass0 = klass0->superclass; | |
698 | } | |
699 | ||
700 | if ((klass->accflags & java::lang::reflect::Modifier::ABSTRACT) != 0) | |
701 | return; | |
702 | ||
703 | // Optimization: If class implements no interfaces, use a common | |
704 | // predefined interface table. | |
705 | if (!has_interfaces) | |
706 | { | |
707 | klass->idt = &null_idt; | |
708 | return; | |
709 | } | |
710 | ||
36739040 TT |
711 | _Jv_ifaces ifaces; |
712 | ifaces.count = 0; | |
713 | ifaces.len = INITIAL_IFACES_LEN; | |
714 | ifaces.list = (jclass *) _Jv_Malloc (ifaces.len * sizeof (jclass *)); | |
715 | ||
716 | int itable_size = get_interfaces (klass, &ifaces); | |
717 | ||
718 | if (ifaces.count > 0) | |
719 | { | |
8b1753e3 TT |
720 | // The classes pointed to by the itable will always be reachable |
721 | // via other paths. | |
a286e145 BM |
722 | int idt_bytes = sizeof (_Jv_IDispatchTable) + (itable_size |
723 | * sizeof (void *)); | |
724 | klass->idt = (_Jv_IDispatchTable *) _Jv_AllocBytes (idt_bytes); | |
725 | klass->idt->itable_length = itable_size; | |
36739040 TT |
726 | |
727 | jshort *itable_offsets = | |
728 | (jshort *) _Jv_Malloc (ifaces.count * sizeof (jshort)); | |
729 | ||
730 | generate_itable (klass, &ifaces, itable_offsets); | |
731 | ||
732 | jshort cls_iindex = find_iindex (ifaces.list, itable_offsets, | |
733 | ifaces.count); | |
734 | ||
735 | for (int i = 0; i < ifaces.count; i++) | |
736 | { | |
a286e145 | 737 | ifaces.list[i]->ioffsets[cls_iindex] = itable_offsets[i]; |
36739040 TT |
738 | } |
739 | ||
a286e145 | 740 | klass->idt->iindex = cls_iindex; |
36739040 TT |
741 | |
742 | _Jv_Free (ifaces.list); | |
743 | _Jv_Free (itable_offsets); | |
744 | } | |
745 | else | |
746 | { | |
a286e145 | 747 | klass->idt->iindex = SHRT_MAX; |
36739040 TT |
748 | } |
749 | } | |
750 | ||
751 | // Return index of item in list, or -1 if item is not present. | |
752 | inline jshort | |
753 | _Jv_Linker::indexof (void *item, void **list, jshort list_len) | |
754 | { | |
755 | for (int i=0; i < list_len; i++) | |
756 | { | |
757 | if (list[i] == item) | |
758 | return i; | |
759 | } | |
760 | return -1; | |
761 | } | |
762 | ||
763 | // Find all unique interfaces directly or indirectly implemented by klass. | |
764 | // Returns the size of the interface dispatch table (itable) for klass, which | |
765 | // is the number of unique interfaces plus the total number of methods that | |
766 | // those interfaces declare. May extend ifaces if required. | |
767 | jshort | |
768 | _Jv_Linker::get_interfaces (jclass klass, _Jv_ifaces *ifaces) | |
769 | { | |
770 | jshort result = 0; | |
771 | ||
772 | for (int i = 0; i < klass->interface_count; i++) | |
773 | { | |
774 | jclass iface = klass->interfaces[i]; | |
775 | ||
776 | /* Make sure interface is linked. */ | |
777 | wait_for_state(iface, JV_STATE_LINKED); | |
778 | ||
779 | if (indexof (iface, (void **) ifaces->list, ifaces->count) == -1) | |
780 | { | |
781 | if (ifaces->count + 1 >= ifaces->len) | |
782 | { | |
783 | /* Resize ifaces list */ | |
784 | ifaces->len = ifaces->len * 2; | |
785 | ifaces->list | |
786 | = (jclass *) _Jv_Realloc (ifaces->list, | |
787 | ifaces->len * sizeof(jclass)); | |
788 | } | |
789 | ifaces->list[ifaces->count] = iface; | |
790 | ifaces->count++; | |
791 | ||
792 | result += get_interfaces (klass->interfaces[i], ifaces); | |
793 | } | |
794 | } | |
88200a8d | 795 | |
36739040 | 796 | if (klass->isInterface()) |
88200a8d TT |
797 | { |
798 | // We want to add 1 plus the number of interface methods here. | |
799 | // But, we take special care to skip <clinit>. | |
800 | ++result; | |
801 | for (int i = 0; i < klass->method_count; ++i) | |
802 | { | |
803 | if (klass->methods[i].name->first() != '<') | |
804 | ++result; | |
805 | } | |
806 | } | |
36739040 TT |
807 | else if (klass->superclass) |
808 | result += get_interfaces (klass->superclass, ifaces); | |
809 | return result; | |
810 | } | |
811 | ||
812 | // Fill out itable in klass, resolving method declarations in each ifaces. | |
813 | // itable_offsets is filled out with the position of each iface in itable, | |
814 | // such that itable[itable_offsets[n]] == ifaces.list[n]. | |
815 | void | |
816 | _Jv_Linker::generate_itable (jclass klass, _Jv_ifaces *ifaces, | |
817 | jshort *itable_offsets) | |
818 | { | |
a286e145 | 819 | void **itable = klass->idt->itable; |
36739040 TT |
820 | jshort itable_pos = 0; |
821 | ||
822 | for (int i = 0; i < ifaces->count; i++) | |
823 | { | |
824 | jclass iface = ifaces->list[i]; | |
825 | itable_offsets[i] = itable_pos; | |
826 | itable_pos = append_partial_itable (klass, iface, itable, itable_pos); | |
827 | ||
a286e145 BM |
828 | /* Create ioffsets table for iface */ |
829 | if (iface->ioffsets == NULL) | |
36739040 | 830 | { |
36739040 | 831 | // The first element of ioffsets is its length (itself included). |
8b1753e3 TT |
832 | jshort *ioffsets = (jshort *) _Jv_AllocBytes (INITIAL_IOFFSETS_LEN |
833 | * sizeof (jshort)); | |
36739040 TT |
834 | ioffsets[0] = INITIAL_IOFFSETS_LEN; |
835 | for (int i = 1; i < INITIAL_IOFFSETS_LEN; i++) | |
836 | ioffsets[i] = -1; | |
837 | ||
a286e145 | 838 | iface->ioffsets = ioffsets; |
36739040 TT |
839 | } |
840 | } | |
841 | } | |
842 | ||
843 | // Format method name for use in error messages. | |
844 | jstring | |
2a2c6e55 TT |
845 | _Jv_GetMethodString (jclass klass, _Jv_Method *meth, |
846 | jclass derived) | |
36739040 | 847 | { |
2a2c6e55 TT |
848 | using namespace java::lang; |
849 | StringBuffer *buf = new StringBuffer (klass->name->toString()); | |
850 | buf->append (jchar ('.')); | |
851 | buf->append (meth->name->toString()); | |
852 | buf->append ((jchar) ' '); | |
853 | buf->append (meth->signature->toString()); | |
854 | if (derived) | |
855 | { | |
856 | buf->append(JvNewStringLatin1(" in ")); | |
857 | buf->append(derived->name->toString()); | |
858 | } | |
859 | return buf->toString(); | |
36739040 TT |
860 | } |
861 | ||
c1a9321f | 862 | void |
36739040 TT |
863 | _Jv_ThrowNoSuchMethodError () |
864 | { | |
865 | throw new java::lang::NoSuchMethodError; | |
866 | } | |
867 | ||
86acf60c | 868 | #if defined USE_LIBFFI && FFI_CLOSURES && defined(INTERPRETER) |
c1a9321f RS |
869 | // A function whose invocation is prepared using libffi. It gets called |
870 | // whenever a static method of a missing class is invoked. The data argument | |
871 | // holds a reference to a String denoting the missing class. | |
872 | // The prepared function call is stored in a class' atable. | |
873 | void | |
874 | _Jv_ThrowNoClassDefFoundErrorTrampoline(ffi_cif *, | |
875 | void *, | |
876 | void **, | |
877 | void *data) | |
878 | { | |
a7f3ff76 | 879 | throw new java::lang::NoClassDefFoundError( |
592fb510 | 880 | _Jv_NewStringUtf8Const((_Jv_Utf8Const *) data)); |
c1a9321f | 881 | } |
a7f3ff76 RS |
882 | #else |
883 | // A variant of the NoClassDefFoundError throwing method that can | |
884 | // be used without libffi. | |
c1a9321f RS |
885 | void |
886 | _Jv_ThrowNoClassDefFoundError() | |
887 | { | |
888 | throw new java::lang::NoClassDefFoundError(); | |
889 | } | |
a7f3ff76 | 890 | #endif |
c1a9321f | 891 | |
9edd0f5e AH |
892 | // Throw a NoSuchFieldError. Called by compiler-generated code when |
893 | // an otable entry is zero. OTABLE_INDEX is the index in the caller's | |
894 | // otable that refers to the missing field. This index may be used to | |
895 | // print diagnostic information about the field. | |
896 | void | |
897 | _Jv_ThrowNoSuchFieldError (int /* otable_index */) | |
898 | { | |
899 | throw new java::lang::NoSuchFieldError; | |
900 | } | |
901 | ||
fc544c81 | 902 | // This is put in empty vtable slots. |
fbb4c46b TT |
903 | void |
904 | _Jv_ThrowAbstractMethodError () | |
fc544c81 TT |
905 | { |
906 | throw new java::lang::AbstractMethodError(); | |
907 | } | |
908 | ||
36739040 TT |
909 | // Each superinterface of a class (i.e. each interface that the class |
910 | // directly or indirectly implements) has a corresponding "Partial | |
911 | // Interface Dispatch Table" whose size is (number of methods + 1) words. | |
912 | // The first word is a pointer to the interface (i.e. the java.lang.Class | |
913 | // instance for that interface). The remaining words are pointers to the | |
914 | // actual methods that implement the methods declared in the interface, | |
915 | // in order of declaration. | |
916 | // | |
917 | // Append partial interface dispatch table for "iface" to "itable", at | |
918 | // position itable_pos. | |
919 | // Returns the offset at which the next partial ITable should be appended. | |
920 | jshort | |
921 | _Jv_Linker::append_partial_itable (jclass klass, jclass iface, | |
88200a8d | 922 | void **itable, jshort pos) |
36739040 TT |
923 | { |
924 | using namespace java::lang::reflect; | |
925 | ||
926 | itable[pos++] = (void *) iface; | |
927 | _Jv_Method *meth; | |
928 | ||
929 | for (int j=0; j < iface->method_count; j++) | |
930 | { | |
88200a8d TT |
931 | // Skip '<clinit>' here. |
932 | if (iface->methods[j].name->first() == '<') | |
933 | continue; | |
934 | ||
36739040 | 935 | meth = NULL; |
2599b56f TT |
936 | jclass cl; |
937 | for (cl = klass; cl; cl = cl->getSuperclass()) | |
36739040 TT |
938 | { |
939 | meth = _Jv_GetMethodLocal (cl, iface->methods[j].name, | |
940 | iface->methods[j].signature); | |
941 | ||
942 | if (meth) | |
943 | break; | |
944 | } | |
945 | ||
88200a8d | 946 | if (meth) |
36739040 TT |
947 | { |
948 | if ((meth->accflags & Modifier::STATIC) != 0) | |
949 | throw new java::lang::IncompatibleClassChangeError | |
2a2c6e55 | 950 | (_Jv_GetMethodString (klass, meth)); |
36739040 TT |
951 | if ((meth->accflags & Modifier::PUBLIC) == 0) |
952 | throw new java::lang::IllegalAccessError | |
2a2c6e55 | 953 | (_Jv_GetMethodString (klass, meth)); |
36739040 | 954 | |
fc544c81 | 955 | if ((meth->accflags & Modifier::ABSTRACT) != 0) |
fbb4c46b | 956 | itable[pos] = (void *) &_Jv_ThrowAbstractMethodError; |
fc544c81 TT |
957 | else |
958 | itable[pos] = meth->ncode; | |
2599b56f TT |
959 | |
960 | if (cl->loader != iface->loader) | |
961 | check_loading_constraints (meth, cl, iface); | |
36739040 TT |
962 | } |
963 | else | |
964 | { | |
965 | // The method doesn't exist in klass. Binary compatibility rules | |
966 | // permit this, so we delay the error until runtime using a pointer | |
967 | // to a method which throws an exception. | |
968 | itable[pos] = (void *) _Jv_ThrowNoSuchMethodError; | |
969 | } | |
970 | pos++; | |
971 | } | |
972 | ||
973 | return pos; | |
974 | } | |
975 | ||
976 | static _Jv_Mutex_t iindex_mutex; | |
977 | static bool iindex_mutex_initialized = false; | |
978 | ||
979 | // We need to find the correct offset in the Class Interface Dispatch | |
980 | // Table for a given interface. Once we have that, invoking an interface | |
981 | // method just requires combining the Method's index in the interface | |
982 | // (known at compile time) to get the correct method. Doing a type test | |
983 | // (cast or instanceof) is the same problem: Once we have a possible Partial | |
984 | // Interface Dispatch Table, we just compare the first element to see if it | |
985 | // matches the desired interface. So how can we find the correct offset? | |
986 | // Our solution is to keep a vector of candiate offsets in each interface | |
a286e145 BM |
987 | // (ioffsets), and in each class we have an index (idt->iindex) used to |
988 | // select the correct offset from ioffsets. | |
36739040 TT |
989 | // |
990 | // Calculate and return iindex for a new class. | |
991 | // ifaces is a vector of num interfaces that the class implements. | |
992 | // offsets[j] is the offset in the interface dispatch table for the | |
993 | // interface corresponding to ifaces[j]. | |
994 | // May extend the interface ioffsets if required. | |
995 | jshort | |
996 | _Jv_Linker::find_iindex (jclass *ifaces, jshort *offsets, jshort num) | |
997 | { | |
998 | int i; | |
999 | int j; | |
1000 | ||
1001 | // Acquire a global lock to prevent itable corruption in case of multiple | |
1002 | // classes that implement an intersecting set of interfaces being linked | |
1003 | // simultaneously. We can assume that the mutex will be initialized | |
1004 | // single-threaded. | |
1005 | if (! iindex_mutex_initialized) | |
1006 | { | |
1007 | _Jv_MutexInit (&iindex_mutex); | |
1008 | iindex_mutex_initialized = true; | |
1009 | } | |
1010 | ||
1011 | _Jv_MutexLock (&iindex_mutex); | |
1012 | ||
1013 | for (i=1;; i++) /* each potential position in ioffsets */ | |
1014 | { | |
1015 | for (j=0;; j++) /* each iface */ | |
1016 | { | |
1017 | if (j >= num) | |
1018 | goto found; | |
a286e145 | 1019 | if (i >= ifaces[j]->ioffsets[0]) |
36739040 | 1020 | continue; |
a286e145 | 1021 | int ioffset = ifaces[j]->ioffsets[i]; |
36739040 TT |
1022 | /* We can potentially share this position with another class. */ |
1023 | if (ioffset >= 0 && ioffset != offsets[j]) | |
1024 | break; /* Nope. Try next i. */ | |
1025 | } | |
1026 | } | |
1027 | found: | |
1028 | for (j = 0; j < num; j++) | |
1029 | { | |
a286e145 | 1030 | int len = ifaces[j]->ioffsets[0]; |
36739040 TT |
1031 | if (i >= len) |
1032 | { | |
1033 | // Resize ioffsets. | |
1034 | int newlen = 2 * len; | |
1035 | if (i >= newlen) | |
1036 | newlen = i + 3; | |
a286e145 BM |
1037 | |
1038 | jshort *old_ioffsets = ifaces[j]->ioffsets; | |
8b1753e3 TT |
1039 | jshort *new_ioffsets = (jshort *) _Jv_AllocBytes (newlen |
1040 | * sizeof(jshort)); | |
36739040 TT |
1041 | memcpy (&new_ioffsets[1], &old_ioffsets[1], |
1042 | (len - 1) * sizeof (jshort)); | |
1043 | new_ioffsets[0] = newlen; | |
1044 | ||
1045 | while (len < newlen) | |
1046 | new_ioffsets[len++] = -1; | |
1047 | ||
a286e145 | 1048 | ifaces[j]->ioffsets = new_ioffsets; |
36739040 | 1049 | } |
a286e145 | 1050 | ifaces[j]->ioffsets[i] = offsets[j]; |
36739040 TT |
1051 | } |
1052 | ||
1053 | _Jv_MutexUnlock (&iindex_mutex); | |
1054 | ||
1055 | return i; | |
1056 | } | |
1057 | ||
86acf60c | 1058 | #if defined USE_LIBFFI && FFI_CLOSURES && defined(INTERPRETER) |
8b1753e3 TT |
1059 | // We use a structure of this type to store the closure that |
1060 | // represents a missing method. | |
1061 | struct method_closure | |
1062 | { | |
1063 | // This field must come first, since the address of this field will | |
1064 | // be the same as the address of the overall structure. This is due | |
1065 | // to disabling interior pointers in the GC. | |
1066 | ffi_closure closure; | |
18fa3240 | 1067 | _Jv_ClosureList list; |
8b1753e3 TT |
1068 | ffi_cif cif; |
1069 | ffi_type *arg_types[1]; | |
1070 | }; | |
1071 | ||
a7f3ff76 | 1072 | void * |
18fa3240 | 1073 | _Jv_Linker::create_error_method (_Jv_Utf8Const *class_name, jclass klass) |
a7f3ff76 | 1074 | { |
18fa3240 | 1075 | void *code; |
8b1753e3 | 1076 | method_closure *closure |
18fa3240 | 1077 | = (method_closure *)ffi_closure_alloc (sizeof (method_closure), &code); |
8b1753e3 TT |
1078 | |
1079 | closure->arg_types[0] = &ffi_type_void; | |
1080 | ||
1081 | // Initializes the cif and the closure. If that worked the closure | |
1082 | // is returned and can be used as a function pointer in a class' | |
1083 | // atable. | |
592fb510 RS |
1084 | if ( ffi_prep_cif (&closure->cif, |
1085 | FFI_DEFAULT_ABI, | |
1086 | 1, | |
1087 | &ffi_type_void, | |
1088 | closure->arg_types) == FFI_OK | |
18fa3240 AO |
1089 | && ffi_prep_closure_loc (&closure->closure, |
1090 | &closure->cif, | |
1091 | _Jv_ThrowNoClassDefFoundErrorTrampoline, | |
1092 | class_name, | |
1093 | code) == FFI_OK) | |
1094 | { | |
1095 | closure->list.registerClosure (klass, closure); | |
1096 | return code; | |
1097 | } | |
8b1753e3 | 1098 | else |
a7f3ff76 | 1099 | { |
18fa3240 | 1100 | ffi_closure_free (closure); |
a7f3ff76 | 1101 | java::lang::StringBuffer *buffer = new java::lang::StringBuffer(); |
8b1753e3 TT |
1102 | buffer->append(JvNewStringLatin1("Error setting up FFI closure" |
1103 | " for static method of" | |
1104 | " missing class: ")); | |
a7f3ff76 | 1105 | buffer->append (_Jv_NewStringUtf8Const(class_name)); |
a7f3ff76 RS |
1106 | throw new java::lang::InternalError(buffer->toString()); |
1107 | } | |
592fb510 | 1108 | } |
a7f3ff76 | 1109 | #else |
592fb510 | 1110 | void * |
18fa3240 | 1111 | _Jv_Linker::create_error_method (_Jv_Utf8Const *, jclass) |
592fb510 | 1112 | { |
a7f3ff76 RS |
1113 | // Codepath for platforms which do not support (or want) libffi. |
1114 | // You have to accept that it is impossible to provide the name | |
1115 | // of the missing class then. | |
e3e1fa67 | 1116 | return (void *) _Jv_ThrowNoClassDefFoundError; |
a7f3ff76 | 1117 | } |
596475f0 | 1118 | #endif // USE_LIBFFI && FFI_CLOSURES |
a7f3ff76 | 1119 | |
36739040 TT |
1120 | // Functions for indirect dispatch (symbolic virtual binding) support. |
1121 | ||
1122 | // There are three tables, atable otable and itable. atable is an | |
1123 | // array of addresses, and otable is an array of offsets, and these | |
1124 | // are used for static and virtual members respectively. itable is an | |
1125 | // array of pairs {address, index} where each address is a pointer to | |
1126 | // an interface. | |
1127 | ||
1128 | // {a,o,i}table_syms is an array of _Jv_MethodSymbols. Each such | |
1129 | // symbol is a tuple of {classname, member name, signature}. | |
1130 | ||
1131 | // Set this to true to enable debugging of indirect dispatch tables/linking. | |
1132 | static bool debug_link = false; | |
1133 | ||
1134 | // link_symbol_table() scans these two arrays and fills in the | |
1135 | // corresponding atable and otable with the addresses of static | |
1136 | // members and the offsets of virtual members. | |
1137 | ||
1138 | // The offset (in bytes) for each resolved method or field is placed | |
1139 | // at the corresponding position in the virtual method offset table | |
1140 | // (klass->otable). | |
1141 | ||
36739040 TT |
1142 | // This must be called while holding the class lock. |
1143 | ||
1144 | void | |
1145 | _Jv_Linker::link_symbol_table (jclass klass) | |
1146 | { | |
1147 | int index = 0; | |
1148 | _Jv_MethodSymbol sym; | |
1149 | if (klass->otable == NULL | |
1150 | || klass->otable->state != 0) | |
1151 | goto atable; | |
1152 | ||
1153 | klass->otable->state = 1; | |
1154 | ||
1155 | if (debug_link) | |
1156 | fprintf (stderr, "Fixing up otable in %s:\n", klass->name->chars()); | |
1157 | for (index = 0; | |
1158 | (sym = klass->otable_syms[index]).class_name != NULL; | |
1159 | ++index) | |
1160 | { | |
1161 | jclass target_class = _Jv_FindClass (sym.class_name, klass->loader); | |
1162 | _Jv_Method *meth = NULL; | |
1163 | ||
1164 | _Jv_Utf8Const *signature = sym.signature; | |
297750da AH |
1165 | uaddr special; |
1166 | maybe_adjust_signature (signature, special); | |
36739040 | 1167 | |
36739040 TT |
1168 | if (target_class == NULL) |
1169 | throw new java::lang::NoClassDefFoundError | |
1170 | (_Jv_NewStringUTF (sym.class_name->chars())); | |
1171 | ||
1172 | // We're looking for a field or a method, and we can tell | |
1173 | // which is needed by looking at the signature. | |
1174 | if (signature->first() == '(' && signature->len() >= 2) | |
1175 | { | |
1176 | // Looks like someone is trying to invoke an interface method | |
1177 | if (target_class->isInterface()) | |
1178 | { | |
1179 | using namespace java::lang; | |
1180 | StringBuffer *sb = new StringBuffer(); | |
1181 | sb->append(JvNewStringLatin1("found interface ")); | |
1182 | sb->append(target_class->getName()); | |
1183 | sb->append(JvNewStringLatin1(" when searching for a class")); | |
1184 | throw new VerifyError(sb->toString()); | |
1185 | } | |
1186 | ||
1187 | // If the target class does not have a vtable_method_count yet, | |
1188 | // then we can't tell the offsets for its methods, so we must lay | |
1189 | // it out now. | |
1190 | wait_for_state(target_class, JV_STATE_PREPARED); | |
1191 | ||
297750da AH |
1192 | try |
1193 | { | |
1194 | meth = (search_method_in_superclasses | |
1195 | (target_class, klass, sym.name, signature, | |
1196 | NULL, special == 0)); | |
1197 | } | |
1198 | catch (::java::lang::IllegalAccessError *e) | |
1199 | { | |
1200 | } | |
36739040 | 1201 | |
9edd0f5e AH |
1202 | // Every class has a throwNoSuchMethodErrorIndex method that |
1203 | // it inherits from java.lang.Object. Find its vtable | |
1204 | // offset. | |
1205 | static int throwNoSuchMethodErrorIndex; | |
1206 | if (throwNoSuchMethodErrorIndex == 0) | |
36739040 | 1207 | { |
9edd0f5e AH |
1208 | Utf8Const* name |
1209 | = _Jv_makeUtf8Const ("throwNoSuchMethodError", | |
1210 | strlen ("throwNoSuchMethodError")); | |
1211 | _Jv_Method* meth | |
1212 | = _Jv_LookupDeclaredMethod (&java::lang::Object::class$, | |
1213 | name, gcj::void_signature); | |
1214 | throwNoSuchMethodErrorIndex | |
1215 | = _Jv_VTable::idx_to_offset (meth->index); | |
36739040 | 1216 | } |
9edd0f5e AH |
1217 | |
1218 | // If we don't find a nonstatic method, insert the | |
1219 | // vtable index of Object.throwNoSuchMethodError(). | |
1220 | // This defers the missing method error until an attempt | |
1221 | // is made to execute it. | |
1222 | { | |
1223 | int offset; | |
1224 | ||
1225 | if (meth != NULL) | |
1226 | offset = _Jv_VTable::idx_to_offset (meth->index); | |
1227 | else | |
1228 | offset = throwNoSuchMethodErrorIndex; | |
1229 | ||
1230 | if (offset == -1) | |
1231 | JvFail ("Bad method index"); | |
1232 | JvAssert (meth->index < target_class->vtable_method_count); | |
1233 | ||
1234 | klass->otable->offsets[index] = offset; | |
1235 | } | |
1236 | ||
36739040 TT |
1237 | if (debug_link) |
1238 | fprintf (stderr, " offsets[%d] = %d (class %s@%p : %s(%s))\n", | |
1239 | (int)index, | |
1240 | (int)klass->otable->offsets[index], | |
1241 | (const char*)target_class->name->chars(), | |
1242 | target_class, | |
1243 | (const char*)sym.name->chars(), | |
1244 | (const char*)signature->chars()); | |
1245 | continue; | |
1246 | } | |
1247 | ||
0006c7b0 | 1248 | // Try fields. |
36739040 | 1249 | { |
36739040 | 1250 | wait_for_state(target_class, JV_STATE_PREPARED); |
f3dc41fe | 1251 | jclass found_class; |
9edd0f5e AH |
1252 | _Jv_Field *the_field = NULL; |
1253 | try | |
1254 | { | |
1255 | the_field = find_field (klass, target_class, &found_class, | |
297750da | 1256 | sym.name, signature); |
9edd0f5e AH |
1257 | if ((the_field->flags & java::lang::reflect::Modifier::STATIC)) |
1258 | throw new java::lang::IncompatibleClassChangeError; | |
1259 | else | |
1260 | klass->otable->offsets[index] = the_field->u.boffset; | |
1261 | } | |
1262 | catch (java::lang::NoSuchFieldError *err) | |
1263 | { | |
1264 | klass->otable->offsets[index] = 0; | |
1265 | } | |
36739040 TT |
1266 | } |
1267 | } | |
1268 | ||
1269 | atable: | |
1270 | if (klass->atable == NULL || klass->atable->state != 0) | |
1271 | goto itable; | |
1272 | ||
1273 | klass->atable->state = 1; | |
1274 | ||
1275 | for (index = 0; | |
1276 | (sym = klass->atable_syms[index]).class_name != NULL; | |
1277 | ++index) | |
1278 | { | |
c1a9321f RS |
1279 | jclass target_class = |
1280 | _Jv_FindClassNoException (sym.class_name, klass->loader); | |
1281 | ||
36739040 | 1282 | _Jv_Method *meth = NULL; |
297750da | 1283 | |
36739040 | 1284 | _Jv_Utf8Const *signature = sym.signature; |
297750da AH |
1285 | uaddr special; |
1286 | maybe_adjust_signature (signature, special); | |
36739040 TT |
1287 | |
1288 | // ??? Setting this pointer to null will at least get us a | |
1289 | // NullPointerException | |
1290 | klass->atable->addresses[index] = NULL; | |
c1a9321f | 1291 | |
18fa3240 AO |
1292 | bool use_error_method = false; |
1293 | ||
c1a9321f RS |
1294 | // If the target class is missing we prepare a function call |
1295 | // that throws a NoClassDefFoundError and store the address of | |
297750da | 1296 | // that newly prepared method in the atable. The user can run |
c1a9321f RS |
1297 | // code in classes where the missing class is part of the |
1298 | // execution environment as long as it is never referenced. | |
36739040 | 1299 | if (target_class == NULL) |
18fa3240 | 1300 | use_error_method = true; |
36739040 TT |
1301 | // We're looking for a static field or a static method, and we |
1302 | // can tell which is needed by looking at the signature. | |
c1a9321f | 1303 | else if (signature->first() == '(' && signature->len() >= 2) |
36739040 TT |
1304 | { |
1305 | // If the target class does not have a vtable_method_count yet, | |
1306 | // then we can't tell the offsets for its methods, so we must lay | |
1307 | // it out now. | |
1308 | wait_for_state (target_class, JV_STATE_PREPARED); | |
1309 | ||
1310 | // Interface methods cannot have bodies. | |
1311 | if (target_class->isInterface()) | |
1312 | { | |
1313 | using namespace java::lang; | |
1314 | StringBuffer *sb = new StringBuffer(); | |
1315 | sb->append(JvNewStringLatin1("class ")); | |
1316 | sb->append(target_class->getName()); | |
1317 | sb->append(JvNewStringLatin1(" is an interface: " | |
1318 | "class expected")); | |
1319 | throw new VerifyError(sb->toString()); | |
1320 | } | |
1321 | ||
297750da AH |
1322 | try |
1323 | { | |
1324 | meth = (search_method_in_superclasses | |
1325 | (target_class, klass, sym.name, signature, | |
1326 | NULL, special == 0)); | |
1327 | } | |
1328 | catch (::java::lang::IllegalAccessError *e) | |
1329 | { | |
1330 | } | |
36739040 TT |
1331 | |
1332 | if (meth != NULL) | |
1333 | { | |
1334 | if (meth->ncode) // Maybe abstract? | |
1335 | { | |
1336 | klass->atable->addresses[index] = meth->ncode; | |
1337 | if (debug_link) | |
1338 | fprintf (stderr, " addresses[%d] = %p (class %s@%p : %s(%s))\n", | |
1339 | index, | |
1340 | &klass->atable->addresses[index], | |
1341 | (const char*)target_class->name->chars(), | |
1342 | klass, | |
1343 | (const char*)sym.name->chars(), | |
1344 | (const char*)signature->chars()); | |
1345 | } | |
1346 | } | |
1347 | else | |
18fa3240 AO |
1348 | use_error_method = true; |
1349 | ||
1350 | if (use_error_method) | |
36739040 | 1351 | klass->atable->addresses[index] |
18fa3240 | 1352 | = create_error_method(sym.class_name, klass); |
36739040 TT |
1353 | |
1354 | continue; | |
1355 | } | |
1356 | ||
18fa3240 | 1357 | |
c1a9321f | 1358 | // Try fields only if the target class exists. |
592fb510 | 1359 | if (target_class != NULL) |
36739040 | 1360 | { |
36739040 | 1361 | wait_for_state(target_class, JV_STATE_PREPARED); |
f3dc41fe AH |
1362 | jclass found_class; |
1363 | _Jv_Field *the_field = find_field (klass, target_class, &found_class, | |
297750da | 1364 | sym.name, signature); |
0006c7b0 TT |
1365 | if ((the_field->flags & java::lang::reflect::Modifier::STATIC)) |
1366 | klass->atable->addresses[index] = the_field->u.addr; | |
36739040 | 1367 | else |
0006c7b0 | 1368 | throw new java::lang::IncompatibleClassChangeError; |
36739040 TT |
1369 | } |
1370 | } | |
1371 | ||
1372 | itable: | |
1373 | if (klass->itable == NULL | |
1374 | || klass->itable->state != 0) | |
1375 | return; | |
1376 | ||
1377 | klass->itable->state = 1; | |
1378 | ||
1379 | for (index = 0; | |
1380 | (sym = klass->itable_syms[index]).class_name != NULL; | |
1381 | ++index) | |
1382 | { | |
1383 | jclass target_class = _Jv_FindClass (sym.class_name, klass->loader); | |
297750da | 1384 | |
36739040 | 1385 | _Jv_Utf8Const *signature = sym.signature; |
297750da AH |
1386 | uaddr special; |
1387 | maybe_adjust_signature (signature, special); | |
36739040 TT |
1388 | |
1389 | jclass cls; | |
1390 | int i; | |
1391 | ||
1392 | wait_for_state(target_class, JV_STATE_LOADED); | |
1393 | bool found = _Jv_getInterfaceMethod (target_class, cls, i, | |
297750da | 1394 | sym.name, signature); |
36739040 TT |
1395 | |
1396 | if (found) | |
1397 | { | |
1398 | klass->itable->addresses[index * 2] = cls; | |
67bbb1e1 | 1399 | klass->itable->addresses[index * 2 + 1] = (void *)(unsigned long) i; |
36739040 TT |
1400 | if (debug_link) |
1401 | { | |
1402 | fprintf (stderr, " interfaces[%d] = %p (interface %s@%p : %s(%s))\n", | |
1403 | index, | |
1404 | klass->itable->addresses[index * 2], | |
1405 | (const char*)cls->name->chars(), | |
1406 | cls, | |
1407 | (const char*)sym.name->chars(), | |
1408 | (const char*)signature->chars()); | |
1409 | fprintf (stderr, " [%d] = offset %d\n", | |
1410 | index + 1, | |
67bbb1e1 | 1411 | (int)(unsigned long)klass->itable->addresses[index * 2 + 1]); |
36739040 TT |
1412 | } |
1413 | ||
1414 | } | |
1415 | else | |
1416 | throw new java::lang::IncompatibleClassChangeError; | |
1417 | } | |
1418 | ||
1419 | } | |
1420 | ||
1421 | // For each catch_record in the list of caught classes, fill in the | |
1422 | // address field. | |
1423 | void | |
1424 | _Jv_Linker::link_exception_table (jclass self) | |
1425 | { | |
1426 | struct _Jv_CatchClass *catch_record = self->catch_classes; | |
1427 | if (!catch_record || catch_record->classname) | |
1428 | return; | |
1429 | catch_record++; | |
1430 | while (catch_record->classname) | |
1431 | { | |
1432 | try | |
1433 | { | |
1434 | jclass target_class | |
1435 | = _Jv_FindClass (catch_record->classname, | |
1436 | self->getClassLoaderInternal ()); | |
1437 | *catch_record->address = target_class; | |
1438 | } | |
1439 | catch (::java::lang::Throwable *t) | |
1440 | { | |
1441 | // FIXME: We need to do something better here. | |
1442 | *catch_record->address = 0; | |
1443 | } | |
1444 | catch_record++; | |
1445 | } | |
1446 | self->catch_classes->classname = (_Jv_Utf8Const *)-1; | |
1447 | } | |
1448 | ||
36739040 TT |
1449 | // Set itable method indexes for members of interface IFACE. |
1450 | void | |
1451 | _Jv_Linker::layout_interface_methods (jclass iface) | |
1452 | { | |
1453 | if (! iface->isInterface()) | |
1454 | return; | |
1455 | ||
1456 | // itable indexes start at 1. | |
1457 | // FIXME: Static initalizers currently get a NULL placeholder entry in the | |
1458 | // itable so they are also assigned an index here. | |
1459 | for (int i = 0; i < iface->method_count; i++) | |
1460 | iface->methods[i].index = i + 1; | |
1461 | } | |
1462 | ||
1463 | // Prepare virtual method declarations in KLASS, and any superclasses | |
1464 | // as required, by determining their vtable index, setting | |
1465 | // method->index, and finally setting the class's vtable_method_count. | |
1466 | // Must be called with the lock for KLASS held. | |
1467 | void | |
1468 | _Jv_Linker::layout_vtable_methods (jclass klass) | |
1469 | { | |
1470 | if (klass->vtable != NULL || klass->isInterface() | |
1471 | || klass->vtable_method_count != -1) | |
1472 | return; | |
1473 | ||
1474 | jclass superclass = klass->getSuperclass(); | |
1475 | ||
1476 | if (superclass != NULL && superclass->vtable_method_count == -1) | |
1477 | { | |
1478 | JvSynchronize sync (superclass); | |
1479 | layout_vtable_methods (superclass); | |
1480 | } | |
1481 | ||
1482 | int index = (superclass == NULL ? 0 : superclass->vtable_method_count); | |
1483 | ||
1484 | for (int i = 0; i < klass->method_count; ++i) | |
1485 | { | |
1486 | _Jv_Method *meth = &klass->methods[i]; | |
1487 | _Jv_Method *super_meth = NULL; | |
1488 | ||
1489 | if (! _Jv_isVirtualMethod (meth)) | |
1490 | continue; | |
1491 | ||
1492 | if (superclass != NULL) | |
1493 | { | |
1494 | jclass declarer; | |
1495 | super_meth = _Jv_LookupDeclaredMethod (superclass, meth->name, | |
1496 | meth->signature, &declarer); | |
1497 | // See if this method actually overrides the other method | |
1498 | // we've found. | |
1499 | if (super_meth) | |
1500 | { | |
1501 | if (! _Jv_isVirtualMethod (super_meth) | |
1502 | || ! _Jv_CheckAccess (klass, declarer, | |
1503 | super_meth->accflags)) | |
1504 | super_meth = NULL; | |
1505 | else if ((super_meth->accflags | |
1506 | & java::lang::reflect::Modifier::FINAL) != 0) | |
1507 | { | |
1508 | using namespace java::lang; | |
1509 | StringBuffer *sb = new StringBuffer(); | |
1510 | sb->append(JvNewStringLatin1("method ")); | |
2a2c6e55 | 1511 | sb->append(_Jv_GetMethodString(klass, meth)); |
36739040 | 1512 | sb->append(JvNewStringLatin1(" overrides final method ")); |
2a2c6e55 | 1513 | sb->append(_Jv_GetMethodString(declarer, super_meth)); |
36739040 TT |
1514 | throw new VerifyError(sb->toString()); |
1515 | } | |
2599b56f TT |
1516 | else if (declarer->loader != klass->loader) |
1517 | { | |
1518 | // JVMS 5.4.2. | |
1519 | check_loading_constraints (meth, klass, declarer); | |
1520 | } | |
36739040 TT |
1521 | } |
1522 | } | |
1523 | ||
1524 | if (super_meth) | |
1525 | meth->index = super_meth->index; | |
1526 | else | |
1527 | meth->index = index++; | |
1528 | } | |
1529 | ||
1530 | klass->vtable_method_count = index; | |
1531 | } | |
1532 | ||
1533 | // Set entries in VTABLE for virtual methods declared in KLASS. | |
1534 | void | |
1535 | _Jv_Linker::set_vtable_entries (jclass klass, _Jv_VTable *vtable) | |
1536 | { | |
1537 | for (int i = klass->method_count - 1; i >= 0; i--) | |
1538 | { | |
1539 | using namespace java::lang::reflect; | |
1540 | ||
1541 | _Jv_Method *meth = &klass->methods[i]; | |
1542 | if (meth->index == (_Jv_ushort) -1) | |
1543 | continue; | |
1544 | if ((meth->accflags & Modifier::ABSTRACT)) | |
fc544c81 TT |
1545 | // FIXME: it might be nice to have a libffi trampoline here, |
1546 | // so we could pass in the method name and other information. | |
fbb4c46b TT |
1547 | vtable->set_method(meth->index, |
1548 | (void *) &_Jv_ThrowAbstractMethodError); | |
36739040 TT |
1549 | else |
1550 | vtable->set_method(meth->index, meth->ncode); | |
1551 | } | |
1552 | } | |
1553 | ||
1554 | // Allocate and lay out the virtual method table for KLASS. This will | |
1555 | // also cause vtables to be generated for any non-abstract | |
1556 | // superclasses, and virtual method layout to occur for any abstract | |
1557 | // superclasses. Must be called with monitor lock for KLASS held. | |
1558 | void | |
1559 | _Jv_Linker::make_vtable (jclass klass) | |
1560 | { | |
1561 | using namespace java::lang::reflect; | |
1562 | ||
1563 | // If the vtable exists, or for interface classes, do nothing. All | |
1564 | // other classes, including abstract classes, need a vtable. | |
1565 | if (klass->vtable != NULL || klass->isInterface()) | |
1566 | return; | |
1567 | ||
1568 | // Ensure all the `ncode' entries are set. | |
1569 | klass->engine->create_ncode(klass); | |
1570 | ||
1571 | // Class must be laid out before we can create a vtable. | |
1572 | if (klass->vtable_method_count == -1) | |
1573 | layout_vtable_methods (klass); | |
1574 | ||
1575 | // Allocate the new vtable. | |
1576 | _Jv_VTable *vtable = _Jv_VTable::new_vtable (klass->vtable_method_count); | |
1577 | klass->vtable = vtable; | |
1578 | ||
1579 | // Copy the vtable of the closest superclass. | |
1580 | jclass superclass = klass->superclass; | |
1581 | { | |
1582 | JvSynchronize sync (superclass); | |
1583 | make_vtable (superclass); | |
1584 | } | |
1585 | for (int i = 0; i < superclass->vtable_method_count; ++i) | |
1586 | vtable->set_method (i, superclass->vtable->get_method (i)); | |
1587 | ||
1588 | // Set the class pointer and GC descriptor. | |
1589 | vtable->clas = klass; | |
1590 | vtable->gc_descr = _Jv_BuildGCDescr (klass); | |
1591 | ||
1592 | // For each virtual declared in klass, set new vtable entry or | |
1593 | // override an old one. | |
1594 | set_vtable_entries (klass, vtable); | |
1595 | ||
fc544c81 TT |
1596 | // Note that we don't check for abstract methods here. We used to, |
1597 | // but there is a JVMS clarification that indicates that a check | |
1598 | // here would be too eager. And, a simple test case confirms this. | |
36739040 TT |
1599 | } |
1600 | ||
1601 | // Lay out the class, allocating space for static fields and computing | |
1602 | // offsets of instance fields. The class lock must be held by the | |
1603 | // caller. | |
1604 | void | |
1605 | _Jv_Linker::ensure_fields_laid_out (jclass klass) | |
1606 | { | |
1607 | if (klass->size_in_bytes != -1) | |
1608 | return; | |
1609 | ||
1610 | // Compute the alignment for this type by searching through the | |
1611 | // superclasses and finding the maximum required alignment. We | |
1612 | // could consider caching this in the Class. | |
1613 | int max_align = __alignof__ (java::lang::Object); | |
1614 | jclass super = klass->getSuperclass(); | |
1615 | while (super != NULL) | |
1616 | { | |
1617 | // Ensure that our super has its super installed before | |
1618 | // recursing. | |
1619 | wait_for_state(super, JV_STATE_LOADING); | |
1620 | ensure_fields_laid_out(super); | |
1621 | int num = JvNumInstanceFields (super); | |
1622 | _Jv_Field *field = JvGetFirstInstanceField (super); | |
1623 | while (num > 0) | |
1624 | { | |
1625 | int field_align = get_alignment_from_class (field->type); | |
1626 | if (field_align > max_align) | |
1627 | max_align = field_align; | |
1628 | ++field; | |
1629 | --num; | |
1630 | } | |
1631 | super = super->getSuperclass(); | |
1632 | } | |
1633 | ||
1634 | int instance_size; | |
8b1753e3 TT |
1635 | // This is the size of the 'static' non-reference fields. |
1636 | int non_reference_size = 0; | |
1637 | // This is the size of the 'static' reference fields. We count | |
1638 | // these separately to make it simpler for the GC to scan them. | |
1639 | int reference_size = 0; | |
36739040 TT |
1640 | |
1641 | // Although java.lang.Object is never interpreted, an interface can | |
1642 | // have a null superclass. Note that we have to lay out an | |
1643 | // interface because it might have static fields. | |
1644 | if (klass->superclass) | |
1645 | instance_size = klass->superclass->size(); | |
1646 | else | |
1647 | instance_size = java::lang::Object::class$.size(); | |
1648 | ||
fdafd461 AH |
1649 | klass->engine->allocate_field_initializers (klass); |
1650 | ||
36739040 TT |
1651 | for (int i = 0; i < klass->field_count; i++) |
1652 | { | |
1653 | int field_size; | |
1654 | int field_align; | |
1655 | ||
1656 | _Jv_Field *field = &klass->fields[i]; | |
1657 | ||
1658 | if (! field->isRef ()) | |
1659 | { | |
1660 | // It is safe to resolve the field here, since it's a | |
1661 | // primitive class, which does not cause loading to happen. | |
1662 | resolve_field (field, klass->loader); | |
36739040 TT |
1663 | field_size = field->type->size (); |
1664 | field_align = get_alignment_from_class (field->type); | |
1665 | } | |
1666 | else | |
1667 | { | |
1668 | field_size = sizeof (jobject); | |
1669 | field_align = __alignof__ (jobject); | |
1670 | } | |
1671 | ||
1672 | field->bsize = field_size; | |
1673 | ||
1674 | if ((field->flags & java::lang::reflect::Modifier::STATIC)) | |
1675 | { | |
1676 | if (field->u.addr == NULL) | |
1677 | { | |
1678 | // This computes an offset into a region we'll allocate | |
8b1753e3 | 1679 | // shortly, and then adds this offset to the start |
36739040 | 1680 | // address. |
8b1753e3 TT |
1681 | if (field->isRef()) |
1682 | { | |
1683 | reference_size = ROUND (reference_size, field_align); | |
1684 | field->u.boffset = reference_size; | |
1685 | reference_size += field_size; | |
1686 | } | |
1687 | else | |
1688 | { | |
1689 | non_reference_size = ROUND (non_reference_size, field_align); | |
1690 | field->u.boffset = non_reference_size; | |
1691 | non_reference_size += field_size; | |
1692 | } | |
36739040 TT |
1693 | } |
1694 | } | |
1695 | else | |
1696 | { | |
1697 | instance_size = ROUND (instance_size, field_align); | |
1698 | field->u.boffset = instance_size; | |
1699 | instance_size += field_size; | |
1700 | if (field_align > max_align) | |
1701 | max_align = field_align; | |
1702 | } | |
1703 | } | |
1704 | ||
8b1753e3 TT |
1705 | if (reference_size != 0 || non_reference_size != 0) |
1706 | klass->engine->allocate_static_fields (klass, reference_size, | |
1707 | non_reference_size); | |
36739040 TT |
1708 | |
1709 | // Set the instance size for the class. Note that first we round it | |
1710 | // to the alignment required for this object; this keeps us in sync | |
1711 | // with our current ABI. | |
1712 | instance_size = ROUND (instance_size, max_align); | |
1713 | klass->size_in_bytes = instance_size; | |
1714 | } | |
1715 | ||
1716 | // This takes the class to state JV_STATE_LINKED. The class lock must | |
1717 | // be held when calling this. | |
1718 | void | |
1719 | _Jv_Linker::ensure_class_linked (jclass klass) | |
1720 | { | |
1721 | if (klass->state >= JV_STATE_LINKED) | |
1722 | return; | |
1723 | ||
1724 | int state = klass->state; | |
1725 | try | |
1726 | { | |
1727 | // Short-circuit, so that mutually dependent classes are ok. | |
1728 | klass->state = JV_STATE_LINKED; | |
1729 | ||
1730 | _Jv_Constants *pool = &klass->constants; | |
1731 | ||
1732 | // Compiled classes require that their class constants be | |
1733 | // resolved here. However, interpreted classes need their | |
1734 | // constants to be resolved lazily. If we resolve an | |
1735 | // interpreted class' constants eagerly, we can end up with | |
1736 | // spurious IllegalAccessErrors when the constant pool contains | |
1737 | // a reference to a class we can't access. This can validly | |
1738 | // occur in an obscure case involving the InnerClasses | |
1739 | // attribute. | |
1740 | if (! _Jv_IsInterpretedClass (klass)) | |
1741 | { | |
1742 | // Resolve class constants first, since other constant pool | |
1743 | // entries may rely on these. | |
1744 | for (int index = 1; index < pool->size; ++index) | |
1745 | { | |
1746 | if (pool->tags[index] == JV_CONSTANT_Class) | |
c1a9321f RS |
1747 | // Lazily resolve the entries. |
1748 | resolve_pool_entry (klass, index, true); | |
36739040 TT |
1749 | } |
1750 | } | |
1751 | ||
36739040 TT |
1752 | // Resolve the remaining constant pool entries. |
1753 | for (int index = 1; index < pool->size; ++index) | |
1754 | { | |
e4493315 AH |
1755 | jbyte tags; |
1756 | _Jv_word data; | |
36739040 | 1757 | |
e4493315 AH |
1758 | tags = read_cpool_entry (&data, pool, index); |
1759 | if (tags == JV_CONSTANT_String) | |
1760 | { | |
1761 | data.o = _Jv_NewStringUtf8Const (data.utf8); | |
1762 | tags |= JV_CONSTANT_ResolvedFlag; | |
1763 | write_cpool_entry (data, tags, pool, index); | |
36739040 TT |
1764 | } |
1765 | } | |
1766 | ||
1767 | if (klass->engine->need_resolve_string_fields()) | |
1768 | { | |
1769 | jfieldID f = JvGetFirstStaticField (klass); | |
1770 | for (int n = JvNumStaticFields (klass); n > 0; --n) | |
1771 | { | |
1772 | int mod = f->getModifiers (); | |
1773 | // If we have a static String field with a non-null initial | |
1774 | // value, we know it points to a Utf8Const. | |
c1a9321f RS |
1775 | |
1776 | // Finds out whether we have to initialize a String without the | |
1777 | // need to resolve the field. | |
1778 | if ((f->isResolved() | |
1779 | ? (f->type == &java::lang::String::class$) | |
1780 | : _Jv_equalUtf8Classnames((_Jv_Utf8Const *) f->type, | |
1781 | java::lang::String::class$.name)) | |
36739040 TT |
1782 | && (mod & java::lang::reflect::Modifier::STATIC) != 0) |
1783 | { | |
1784 | jstring *strp = (jstring *) f->u.addr; | |
1785 | if (*strp) | |
1786 | *strp = _Jv_NewStringUtf8Const ((_Jv_Utf8Const *) *strp); | |
1787 | } | |
1788 | f = f->getNextField (); | |
1789 | } | |
1790 | } | |
1791 | ||
1792 | klass->notifyAll (); | |
1793 | ||
1794 | _Jv_PushClass (klass); | |
1795 | } | |
1796 | catch (java::lang::Throwable *t) | |
1797 | { | |
1798 | klass->state = state; | |
1799 | throw t; | |
1800 | } | |
1801 | } | |
1802 | ||
1803 | // This ensures that symbolic superclass and superinterface references | |
1804 | // are resolved for the indicated class. This must be called with the | |
1805 | // class lock held. | |
1806 | void | |
1807 | _Jv_Linker::ensure_supers_installed (jclass klass) | |
1808 | { | |
1809 | resolve_class_ref (klass, &klass->superclass); | |
1810 | // An interface won't have a superclass. | |
1811 | if (klass->superclass) | |
1812 | wait_for_state (klass->superclass, JV_STATE_LOADING); | |
1813 | ||
1814 | for (int i = 0; i < klass->interface_count; ++i) | |
1815 | { | |
1816 | resolve_class_ref (klass, &klass->interfaces[i]); | |
1817 | wait_for_state (klass->interfaces[i], JV_STATE_LOADING); | |
1818 | } | |
1819 | } | |
1820 | ||
1821 | // This adds missing `Miranda methods' to a class. | |
1822 | void | |
1823 | _Jv_Linker::add_miranda_methods (jclass base, jclass iface_class) | |
1824 | { | |
1825 | // Note that at this point, all our supers, and the supers of all | |
1826 | // our superclasses and superinterfaces, will have been installed. | |
1827 | ||
1828 | for (int i = 0; i < iface_class->interface_count; ++i) | |
1829 | { | |
1830 | jclass interface = iface_class->interfaces[i]; | |
1831 | ||
1832 | for (int j = 0; j < interface->method_count; ++j) | |
1833 | { | |
1834 | _Jv_Method *meth = &interface->methods[j]; | |
1835 | // Don't bother with <clinit>. | |
1836 | if (meth->name->first() == '<') | |
1837 | continue; | |
1838 | _Jv_Method *new_meth = _Jv_LookupDeclaredMethod (base, meth->name, | |
1839 | meth->signature); | |
1840 | if (! new_meth) | |
1841 | { | |
1842 | // We assume that such methods are very unlikely, so we | |
1843 | // just reallocate the method array each time one is | |
1844 | // found. This greatly simplifies the searching -- | |
1845 | // otherwise we have to make sure that each such method | |
1846 | // found is really unique among all superinterfaces. | |
1847 | int new_count = base->method_count + 1; | |
1848 | _Jv_Method *new_m | |
8b1753e3 TT |
1849 | = (_Jv_Method *) _Jv_AllocRawObj (sizeof (_Jv_Method) |
1850 | * new_count); | |
36739040 TT |
1851 | memcpy (new_m, base->methods, |
1852 | sizeof (_Jv_Method) * base->method_count); | |
1853 | ||
1854 | // Add new method. | |
1855 | new_m[base->method_count] = *meth; | |
1856 | new_m[base->method_count].index = (_Jv_ushort) -1; | |
1857 | new_m[base->method_count].accflags | |
1858 | |= java::lang::reflect::Modifier::INVISIBLE; | |
1859 | ||
1860 | base->methods = new_m; | |
1861 | base->method_count = new_count; | |
1862 | } | |
1863 | } | |
1864 | ||
1865 | wait_for_state (interface, JV_STATE_LOADED); | |
1866 | add_miranda_methods (base, interface); | |
1867 | } | |
1868 | } | |
1869 | ||
1870 | // This ensures that the class' method table is "complete". This must | |
1871 | // be called with the class lock held. | |
1872 | void | |
1873 | _Jv_Linker::ensure_method_table_complete (jclass klass) | |
1874 | { | |
02f3e085 | 1875 | if (klass->vtable != NULL) |
36739040 TT |
1876 | return; |
1877 | ||
1878 | // We need our superclass to have its own Miranda methods installed. | |
02f3e085 AH |
1879 | if (! klass->isInterface()) |
1880 | wait_for_state (klass->getSuperclass (), JV_STATE_LOADED); | |
36739040 TT |
1881 | |
1882 | // A class might have so-called "Miranda methods". This is a method | |
1883 | // that is declared in an interface and not re-declared in an | |
1884 | // abstract class. Some compilers don't emit declarations for such | |
1885 | // methods in the class; this will give us problems since we expect | |
1886 | // a declaration for any method requiring a vtable entry. We handle | |
1887 | // this here by searching for such methods and constructing new | |
1888 | // internal declarations for them. Note that we do this | |
1889 | // unconditionally, and not just for abstract classes, to correctly | |
1890 | // account for cases where a class is modified to be concrete and | |
1891 | // still incorrectly inherits an abstract method. | |
1892 | int pre_count = klass->method_count; | |
1893 | add_miranda_methods (klass, klass); | |
1894 | ||
1895 | // Let the execution engine know that we've added methods. | |
1896 | if (klass->method_count != pre_count) | |
1897 | klass->engine->post_miranda_hook(klass); | |
1898 | } | |
1899 | ||
1900 | // Verify a class. Must be called with class lock held. | |
1901 | void | |
1902 | _Jv_Linker::verify_class (jclass klass) | |
1903 | { | |
1904 | klass->engine->verify(klass); | |
1905 | } | |
1906 | ||
1907 | // Check the assertions contained in the type assertion table for KLASS. | |
1908 | // This is the equivilent of bytecode verification for native, BC-ABI code. | |
1909 | void | |
1910 | _Jv_Linker::verify_type_assertions (jclass klass) | |
1911 | { | |
1912 | if (debug_link) | |
1913 | fprintf (stderr, "Evaluating type assertions for %s:\n", | |
1914 | klass->name->chars()); | |
1915 | ||
1916 | if (klass->assertion_table == NULL) | |
1917 | return; | |
1918 | ||
1919 | for (int i = 0;; i++) | |
1920 | { | |
1921 | int assertion_code = klass->assertion_table[i].assertion_code; | |
1922 | _Jv_Utf8Const *op1 = klass->assertion_table[i].op1; | |
1923 | _Jv_Utf8Const *op2 = klass->assertion_table[i].op2; | |
1924 | ||
1925 | if (assertion_code == JV_ASSERT_END_OF_TABLE) | |
1926 | return; | |
1927 | else if (assertion_code == JV_ASSERT_TYPES_COMPATIBLE) | |
1928 | { | |
1929 | if (debug_link) | |
1930 | { | |
1931 | fprintf (stderr, " code=%i, operand A=%s B=%s\n", | |
1932 | assertion_code, op1->chars(), op2->chars()); | |
1933 | } | |
1934 | ||
1935 | // The operands are class signatures. op1 is the source, | |
1936 | // op2 is the target. | |
1937 | jclass cl1 = _Jv_FindClassFromSignature (op1->chars(), | |
1938 | klass->getClassLoaderInternal()); | |
1939 | jclass cl2 = _Jv_FindClassFromSignature (op2->chars(), | |
1940 | klass->getClassLoaderInternal()); | |
1941 | ||
1942 | // If the class doesn't exist, ignore the assertion. An exception | |
1943 | // will be thrown later if an attempt is made to actually | |
1944 | // instantiate the class. | |
1945 | if (cl1 == NULL || cl2 == NULL) | |
1946 | continue; | |
1947 | ||
852993e3 | 1948 | if (! _Jv_IsAssignableFromSlow (cl1, cl2)) |
36739040 TT |
1949 | { |
1950 | jstring s = JvNewStringUTF ("Incompatible types: In class "); | |
1951 | s = s->concat (klass->getName()); | |
1952 | s = s->concat (JvNewStringUTF (": ")); | |
1953 | s = s->concat (cl1->getName()); | |
1954 | s = s->concat (JvNewStringUTF (" is not assignable to ")); | |
1955 | s = s->concat (cl2->getName()); | |
1956 | throw new java::lang::VerifyError (s); | |
1957 | } | |
1958 | } | |
1959 | else if (assertion_code == JV_ASSERT_IS_INSTANTIABLE) | |
1960 | { | |
1961 | // TODO: Implement this. | |
1962 | } | |
1963 | // Unknown assertion codes are ignored, for forwards-compatibility. | |
1964 | } | |
1965 | } | |
1966 | ||
1967 | void | |
1968 | _Jv_Linker::print_class_loaded (jclass klass) | |
1969 | { | |
1970 | char *codesource = NULL; | |
1971 | if (klass->protectionDomain != NULL) | |
1972 | { | |
1973 | java::security::CodeSource *cs | |
1974 | = klass->protectionDomain->getCodeSource(); | |
1975 | if (cs != NULL) | |
1976 | { | |
1977 | jstring css = cs->toString(); | |
1978 | int len = JvGetStringUTFLength(css); | |
1979 | codesource = (char *) _Jv_AllocBytes(len + 1); | |
1980 | JvGetStringUTFRegion(css, 0, css->length(), codesource); | |
1981 | codesource[len] = '\0'; | |
1982 | } | |
1983 | } | |
1984 | if (codesource == NULL) | |
2cf94e58 | 1985 | codesource = (char *) "<no code source>"; |
36739040 | 1986 | |
2cf94e58 | 1987 | const char *abi; |
36739040 TT |
1988 | if (_Jv_IsInterpretedClass (klass)) |
1989 | abi = "bytecode"; | |
97b51fd0 | 1990 | else if (_Jv_IsBinaryCompatibilityABI (klass)) |
36739040 TT |
1991 | abi = "BC-compiled"; |
1992 | else | |
1993 | abi = "pre-compiled"; | |
1994 | ||
1995 | fprintf (stderr, "[Loaded (%s) %s from %s]\n", abi, klass->name->chars(), | |
1996 | codesource); | |
1997 | } | |
1998 | ||
1999 | // FIXME: mention invariants and stuff. | |
2000 | void | |
2001 | _Jv_Linker::wait_for_state (jclass klass, int state) | |
2002 | { | |
2003 | if (klass->state >= state) | |
2004 | return; | |
2005 | ||
36739040 | 2006 | java::lang::Thread *self = java::lang::Thread::currentThread(); |
36739040 | 2007 | |
9ea6c4a4 KS |
2008 | { |
2009 | JvSynchronize sync (klass); | |
36739040 | 2010 | |
9ea6c4a4 KS |
2011 | // This is similar to the strategy for class initialization. If we |
2012 | // already hold the lock, just leave. | |
2013 | while (klass->state <= state | |
2014 | && klass->thread | |
2015 | && klass->thread != self) | |
2016 | klass->wait (); | |
2017 | ||
2018 | java::lang::Thread *save = klass->thread; | |
2019 | klass->thread = self; | |
2020 | ||
2021 | // Allocate memory for static fields and constants. | |
2022 | if (GC_base (klass) && klass->fields && ! GC_base (klass->fields)) | |
2023 | { | |
2024 | jsize count = klass->field_count; | |
2025 | if (count) | |
2026 | { | |
2027 | _Jv_Field* fields | |
2028 | = (_Jv_Field*) _Jv_AllocRawObj (count * sizeof (_Jv_Field)); | |
2029 | memcpy ((void*)fields, | |
2030 | (void*)klass->fields, | |
2031 | count * sizeof (_Jv_Field)); | |
2032 | klass->fields = fields; | |
2033 | } | |
2034 | } | |
621ae65d | 2035 | |
36739040 TT |
2036 | // Print some debugging info if requested. Interpreted classes are |
2037 | // handled in defineclass, so we only need to handle the two | |
2038 | // pre-compiled cases here. | |
97b8365c | 2039 | if ((klass->state == JV_STATE_COMPILED |
36739040 | 2040 | || klass->state == JV_STATE_PRELOADING) |
f37a936b | 2041 | && ! _Jv_IsInterpretedClass (klass)) |
97b8365c TT |
2042 | { |
2043 | if (gcj::verbose_class_flag) | |
2044 | print_class_loaded (klass); | |
2045 | ++gcj::loadedClasses; | |
2046 | } | |
36739040 | 2047 | |
9ea6c4a4 KS |
2048 | try |
2049 | { | |
2050 | if (state >= JV_STATE_LOADING && klass->state < JV_STATE_LOADING) | |
2051 | { | |
2052 | ensure_supers_installed (klass); | |
2053 | klass->set_state(JV_STATE_LOADING); | |
2054 | } | |
36739040 | 2055 | |
9ea6c4a4 KS |
2056 | if (state >= JV_STATE_LOADED && klass->state < JV_STATE_LOADED) |
2057 | { | |
2058 | ensure_method_table_complete (klass); | |
2059 | klass->set_state(JV_STATE_LOADED); | |
2060 | } | |
36739040 | 2061 | |
9ea6c4a4 KS |
2062 | if (state >= JV_STATE_PREPARED && klass->state < JV_STATE_PREPARED) |
2063 | { | |
2064 | ensure_fields_laid_out (klass); | |
2065 | make_vtable (klass); | |
2066 | layout_interface_methods (klass); | |
2067 | prepare_constant_time_tables (klass); | |
2068 | klass->set_state(JV_STATE_PREPARED); | |
2069 | } | |
36739040 | 2070 | |
9ea6c4a4 KS |
2071 | if (state >= JV_STATE_LINKED && klass->state < JV_STATE_LINKED) |
2072 | { | |
2073 | if (gcj::verifyClasses) | |
2074 | verify_class (klass); | |
36739040 | 2075 | |
9ea6c4a4 KS |
2076 | ensure_class_linked (klass); |
2077 | link_exception_table (klass); | |
2078 | link_symbol_table (klass); | |
2079 | klass->set_state(JV_STATE_LINKED); | |
2080 | } | |
2081 | } | |
2082 | catch (java::lang::Throwable *exc) | |
2083 | { | |
2084 | klass->thread = save; | |
2085 | klass->set_state(JV_STATE_ERROR); | |
2086 | throw exc; | |
2087 | } | |
2088 | ||
2089 | klass->thread = save; | |
36739040 | 2090 | |
9ea6c4a4 KS |
2091 | if (klass->state == JV_STATE_ERROR) |
2092 | throw new java::lang::LinkageError; | |
2093 | } | |
36739040 | 2094 | |
86acf60c | 2095 | #ifdef INTERPRETER |
9ea6c4a4 KS |
2096 | if (__builtin_expect (klass->state == JV_STATE_LINKED, false) |
2097 | && state >= JV_STATE_LINKED | |
2098 | && JVMTI_REQUESTED_EVENT (ClassPrepare)) | |
2099 | { | |
2100 | JNIEnv *jni_env = _Jv_GetCurrentJNIEnv (); | |
2101 | _Jv_JVMTI_PostEvent (JVMTI_EVENT_CLASS_PREPARE, self, jni_env, | |
2102 | klass); | |
2103 | } | |
86acf60c | 2104 | #endif |
36739040 | 2105 | } |