Wed, 12 Oct 2011 21:00:13 -0700
7092712: JSR 292: unloaded invokedynamic call sites can lead to a crash with signature types not on BCP
Reviewed-by: jrose, never
1 /*
2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "ci/ciField.hpp"
27 #include "ci/ciInstance.hpp"
28 #include "ci/ciInstanceKlass.hpp"
29 #include "ci/ciUtilities.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/allocation.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "oops/fieldStreams.hpp"
35 #include "runtime/fieldDescriptor.hpp"
37 // ciInstanceKlass
38 //
39 // This class represents a klassOop in the HotSpot virtual machine
40 // whose Klass part in an instanceKlass.
42 // ------------------------------------------------------------------
43 // ciInstanceKlass::ciInstanceKlass
44 //
45 // Loaded instance klass.
46 ciInstanceKlass::ciInstanceKlass(KlassHandle h_k) :
47 ciKlass(h_k), _non_static_fields(NULL)
48 {
49 assert(get_Klass()->oop_is_instance(), "wrong type");
50 assert(get_instanceKlass()->is_loaded(), "must be at least loaded");
51 instanceKlass* ik = get_instanceKlass();
53 AccessFlags access_flags = ik->access_flags();
54 _flags = ciFlags(access_flags);
55 _has_finalizer = access_flags.has_finalizer();
56 _has_subklass = ik->subklass() != NULL;
57 _init_state = (instanceKlass::ClassState)ik->get_init_state();
58 _nonstatic_field_size = ik->nonstatic_field_size();
59 _has_nonstatic_fields = ik->has_nonstatic_fields();
60 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields:
62 _nof_implementors = ik->nof_implementors();
63 for (int i = 0; i < implementors_limit; i++) {
64 _implementors[i] = NULL; // we will fill these lazily
65 }
67 Thread *thread = Thread::current();
68 if (ciObjectFactory::is_initialized()) {
69 _loader = JNIHandles::make_local(thread, ik->class_loader());
70 _protection_domain = JNIHandles::make_local(thread,
71 ik->protection_domain());
72 _is_shared = false;
73 } else {
74 Handle h_loader(thread, ik->class_loader());
75 Handle h_protection_domain(thread, ik->protection_domain());
76 _loader = JNIHandles::make_global(h_loader);
77 _protection_domain = JNIHandles::make_global(h_protection_domain);
78 _is_shared = true;
79 }
81 // Lazy fields get filled in only upon request.
82 _super = NULL;
83 _java_mirror = NULL;
85 if (is_shared()) {
86 if (h_k() != SystemDictionary::Object_klass()) {
87 super();
88 }
89 //compute_nonstatic_fields(); // done outside of constructor
90 }
92 _field_cache = NULL;
93 }
95 // Version for unloaded classes:
96 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
97 jobject loader, jobject protection_domain)
98 : ciKlass(name, ciInstanceKlassKlass::make())
99 {
100 assert(name->byte_at(0) != '[', "not an instance klass");
101 _init_state = (instanceKlass::ClassState)0;
102 _nonstatic_field_size = -1;
103 _has_nonstatic_fields = false;
104 _nonstatic_fields = NULL;
105 _nof_implementors = -1;
106 _loader = loader;
107 _protection_domain = protection_domain;
108 _is_shared = false;
109 _super = NULL;
110 _java_mirror = NULL;
111 _field_cache = NULL;
112 }
116 // ------------------------------------------------------------------
117 // ciInstanceKlass::compute_shared_is_initialized
118 void ciInstanceKlass::compute_shared_init_state() {
119 GUARDED_VM_ENTRY(
120 instanceKlass* ik = get_instanceKlass();
121 _init_state = (instanceKlass::ClassState)ik->get_init_state();
122 )
123 }
125 // ------------------------------------------------------------------
126 // ciInstanceKlass::compute_shared_has_subklass
127 bool ciInstanceKlass::compute_shared_has_subklass() {
128 GUARDED_VM_ENTRY(
129 instanceKlass* ik = get_instanceKlass();
130 _has_subklass = ik->subklass() != NULL;
131 return _has_subklass;
132 )
133 }
135 // ------------------------------------------------------------------
136 // ciInstanceKlass::compute_shared_nof_implementors
137 int ciInstanceKlass::compute_shared_nof_implementors() {
138 // We requery this property, since it is a very old ciObject.
139 GUARDED_VM_ENTRY(
140 instanceKlass* ik = get_instanceKlass();
141 _nof_implementors = ik->nof_implementors();
142 return _nof_implementors;
143 )
144 }
146 // ------------------------------------------------------------------
147 // ciInstanceKlass::loader
148 oop ciInstanceKlass::loader() {
149 ASSERT_IN_VM;
150 return JNIHandles::resolve(_loader);
151 }
153 // ------------------------------------------------------------------
154 // ciInstanceKlass::loader_handle
155 jobject ciInstanceKlass::loader_handle() {
156 return _loader;
157 }
159 // ------------------------------------------------------------------
160 // ciInstanceKlass::protection_domain
161 oop ciInstanceKlass::protection_domain() {
162 ASSERT_IN_VM;
163 return JNIHandles::resolve(_protection_domain);
164 }
166 // ------------------------------------------------------------------
167 // ciInstanceKlass::protection_domain_handle
168 jobject ciInstanceKlass::protection_domain_handle() {
169 return _protection_domain;
170 }
172 // ------------------------------------------------------------------
173 // ciInstanceKlass::field_cache
174 //
175 // Get the field cache associated with this klass.
176 ciConstantPoolCache* ciInstanceKlass::field_cache() {
177 if (is_shared()) {
178 return NULL;
179 }
180 if (_field_cache == NULL) {
181 assert(!is_java_lang_Object(), "Object has no fields");
182 Arena* arena = CURRENT_ENV->arena();
183 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
184 }
185 return _field_cache;
186 }
188 // ------------------------------------------------------------------
189 // ciInstanceKlass::get_canonical_holder
190 //
191 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
192 #ifdef ASSERT
193 if (!(offset >= 0 && offset < layout_helper())) {
194 tty->print("*** get_canonical_holder(%d) on ", offset);
195 this->print();
196 tty->print_cr(" ***");
197 };
198 assert(offset >= 0 && offset < layout_helper(), "offset must be tame");
199 #endif
201 if (offset < instanceOopDesc::base_offset_in_bytes()) {
202 // All header offsets belong properly to java/lang/Object.
203 return CURRENT_ENV->Object_klass();
204 }
206 ciInstanceKlass* self = this;
207 for (;;) {
208 assert(self->is_loaded(), "must be loaded to have size");
209 ciInstanceKlass* super = self->super();
210 if (super == NULL || super->nof_nonstatic_fields() == 0 ||
211 !super->contains_field_offset(offset)) {
212 return self;
213 } else {
214 self = super; // return super->get_canonical_holder(offset)
215 }
216 }
217 }
219 // ------------------------------------------------------------------
220 // ciInstanceKlass::is_java_lang_Object
221 //
222 // Is this klass java.lang.Object?
223 bool ciInstanceKlass::is_java_lang_Object() {
224 return equals(CURRENT_ENV->Object_klass());
225 }
227 // ------------------------------------------------------------------
228 // ciInstanceKlass::uses_default_loader
229 bool ciInstanceKlass::uses_default_loader() {
230 // Note: We do not need to resolve the handle or enter the VM
231 // in order to test null-ness.
232 return _loader == NULL;
233 }
235 // ------------------------------------------------------------------
236 // ciInstanceKlass::is_in_package
237 //
238 // Is this klass in the given package?
239 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
240 // To avoid class loader mischief, this test always rejects application classes.
241 if (!uses_default_loader())
242 return false;
243 GUARDED_VM_ENTRY(
244 return is_in_package_impl(packagename, len);
245 )
246 }
248 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
249 ASSERT_IN_VM;
251 // If packagename contains trailing '/' exclude it from the
252 // prefix-test since we test for it explicitly.
253 if (packagename[len - 1] == '/')
254 len--;
256 if (!name()->starts_with(packagename, len))
257 return false;
259 // Test if the class name is something like "java/lang".
260 if ((len + 1) > name()->utf8_length())
261 return false;
263 // Test for trailing '/'
264 if ((char) name()->byte_at(len) != '/')
265 return false;
267 // Make sure it's not actually in a subpackage:
268 if (name()->index_of_at(len+1, "/", 1) >= 0)
269 return false;
271 return true;
272 }
274 // ------------------------------------------------------------------
275 // ciInstanceKlass::print_impl
276 //
277 // Implementation of the print method.
278 void ciInstanceKlass::print_impl(outputStream* st) {
279 ciKlass::print_impl(st);
280 GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());)
281 if (is_loaded()) {
282 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
283 bool_to_str(is_initialized()),
284 bool_to_str(has_finalizer()),
285 bool_to_str(has_subklass()),
286 layout_helper());
288 _flags.print_klass_flags();
290 if (_super) {
291 st->print(" super=");
292 _super->print_name();
293 }
294 if (_java_mirror) {
295 st->print(" mirror=PRESENT");
296 }
297 } else {
298 st->print(" loaded=false");
299 }
300 }
302 // ------------------------------------------------------------------
303 // ciInstanceKlass::super
304 //
305 // Get the superklass of this klass.
306 ciInstanceKlass* ciInstanceKlass::super() {
307 assert(is_loaded(), "must be loaded");
308 if (_super == NULL && !is_java_lang_Object()) {
309 GUARDED_VM_ENTRY(
310 klassOop super_klass = get_instanceKlass()->super();
311 _super = CURRENT_ENV->get_object(super_klass)->as_instance_klass();
312 )
313 }
314 return _super;
315 }
317 // ------------------------------------------------------------------
318 // ciInstanceKlass::java_mirror
319 //
320 // Get the instance of java.lang.Class corresponding to this klass.
321 // Cache it on this->_java_mirror.
322 ciInstance* ciInstanceKlass::java_mirror() {
323 if (is_shared()) {
324 return ciKlass::java_mirror();
325 }
326 if (_java_mirror == NULL) {
327 _java_mirror = ciKlass::java_mirror();
328 }
329 return _java_mirror;
330 }
332 // ------------------------------------------------------------------
333 // ciInstanceKlass::unique_concrete_subklass
334 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
335 if (!is_loaded()) return NULL; // No change if class is not loaded
336 if (!is_abstract()) return NULL; // Only applies to abstract classes.
337 if (!has_subklass()) return NULL; // Must have at least one subklass.
338 VM_ENTRY_MARK;
339 instanceKlass* ik = get_instanceKlass();
340 Klass* up = ik->up_cast_abstract();
341 assert(up->oop_is_instance(), "must be instanceKlass");
342 if (ik == up) {
343 return NULL;
344 }
345 return CURRENT_THREAD_ENV->get_object(up->as_klassOop())->as_instance_klass();
346 }
348 // ------------------------------------------------------------------
349 // ciInstanceKlass::has_finalizable_subclass
350 bool ciInstanceKlass::has_finalizable_subclass() {
351 if (!is_loaded()) return true;
352 VM_ENTRY_MARK;
353 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
354 }
356 // ------------------------------------------------------------------
357 // ciInstanceKlass::get_field_by_offset
358 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
359 if (!is_static) {
360 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
361 ciField* field = _nonstatic_fields->at(i);
362 int field_off = field->offset_in_bytes();
363 if (field_off == field_offset)
364 return field;
365 if (field_off > field_offset)
366 break;
367 // could do binary search or check bins, but probably not worth it
368 }
369 return NULL;
370 }
371 VM_ENTRY_MARK;
372 instanceKlass* k = get_instanceKlass();
373 fieldDescriptor fd;
374 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
375 return NULL;
376 }
377 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
378 return field;
379 }
381 // ------------------------------------------------------------------
382 // ciInstanceKlass::get_field_by_name
383 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
384 VM_ENTRY_MARK;
385 instanceKlass* k = get_instanceKlass();
386 fieldDescriptor fd;
387 klassOop def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd);
388 if (def == NULL) {
389 return NULL;
390 }
391 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
392 return field;
393 }
395 // ------------------------------------------------------------------
396 // ciInstanceKlass::non_static_fields.
398 class NonStaticFieldFiller: public FieldClosure {
399 GrowableArray<ciField*>* _arr;
400 ciEnv* _curEnv;
401 public:
402 NonStaticFieldFiller(ciEnv* curEnv, GrowableArray<ciField*>* arr) :
403 _curEnv(curEnv), _arr(arr)
404 {}
405 void do_field(fieldDescriptor* fd) {
406 ciField* field = new (_curEnv->arena()) ciField(fd);
407 _arr->append(field);
408 }
409 };
411 GrowableArray<ciField*>* ciInstanceKlass::non_static_fields() {
412 if (_non_static_fields == NULL) {
413 VM_ENTRY_MARK;
414 ciEnv* curEnv = ciEnv::current();
415 instanceKlass* ik = get_instanceKlass();
416 int max_n_fields = ik->java_fields_count();
418 Arena* arena = curEnv->arena();
419 _non_static_fields =
420 new (arena) GrowableArray<ciField*>(arena, max_n_fields, 0, NULL);
421 NonStaticFieldFiller filler(curEnv, _non_static_fields);
422 ik->do_nonstatic_fields(&filler);
423 }
424 return _non_static_fields;
425 }
427 static int sort_field_by_offset(ciField** a, ciField** b) {
428 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
429 // (no worries about 32-bit overflow...)
430 }
432 // ------------------------------------------------------------------
433 // ciInstanceKlass::compute_nonstatic_fields
434 int ciInstanceKlass::compute_nonstatic_fields() {
435 assert(is_loaded(), "must be loaded");
437 if (_nonstatic_fields != NULL)
438 return _nonstatic_fields->length();
440 if (!has_nonstatic_fields()) {
441 Arena* arena = CURRENT_ENV->arena();
442 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
443 return 0;
444 }
445 assert(!is_java_lang_Object(), "bootstrap OK");
447 // Size in bytes of my fields, including inherited fields.
448 int fsize = nonstatic_field_size() * heapOopSize;
450 ciInstanceKlass* super = this->super();
451 GrowableArray<ciField*>* super_fields = NULL;
452 if (super != NULL && super->has_nonstatic_fields()) {
453 int super_fsize = super->nonstatic_field_size() * heapOopSize;
454 int super_flen = super->nof_nonstatic_fields();
455 super_fields = super->_nonstatic_fields;
456 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
457 // See if I am no larger than my super; if so, I can use his fields.
458 if (fsize == super_fsize) {
459 _nonstatic_fields = super_fields;
460 return super_fields->length();
461 }
462 }
464 GrowableArray<ciField*>* fields = NULL;
465 GUARDED_VM_ENTRY({
466 fields = compute_nonstatic_fields_impl(super_fields);
467 });
469 if (fields == NULL) {
470 // This can happen if this class (java.lang.Class) has invisible fields.
471 _nonstatic_fields = super_fields;
472 return super_fields->length();
473 }
475 int flen = fields->length();
477 // Now sort them by offset, ascending.
478 // (In principle, they could mix with superclass fields.)
479 fields->sort(sort_field_by_offset);
480 _nonstatic_fields = fields;
481 return flen;
482 }
484 GrowableArray<ciField*>*
485 ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>*
486 super_fields) {
487 ASSERT_IN_VM;
488 Arena* arena = CURRENT_ENV->arena();
489 int flen = 0;
490 GrowableArray<ciField*>* fields = NULL;
491 instanceKlass* k = get_instanceKlass();
492 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
493 if (fs.access_flags().is_static()) continue;
494 flen += 1;
495 }
497 // allocate the array:
498 if (flen == 0) {
499 return NULL; // return nothing if none are locally declared
500 }
501 if (super_fields != NULL) {
502 flen += super_fields->length();
503 }
504 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
505 if (super_fields != NULL) {
506 fields->appendAll(super_fields);
507 }
509 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
510 if (fs.access_flags().is_static()) continue;
511 fieldDescriptor fd;
512 fd.initialize(k->as_klassOop(), fs.index());
513 ciField* field = new (arena) ciField(&fd);
514 fields->append(field);
515 }
516 assert(fields->length() == flen, "sanity");
517 return fields;
518 }
520 // ------------------------------------------------------------------
521 // ciInstanceKlass::find_method
522 //
523 // Find a method in this klass.
524 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
525 VM_ENTRY_MARK;
526 instanceKlass* k = get_instanceKlass();
527 Symbol* name_sym = name->get_symbol();
528 Symbol* sig_sym= signature->get_symbol();
530 methodOop m = k->find_method(name_sym, sig_sym);
531 if (m == NULL) return NULL;
533 return CURRENT_THREAD_ENV->get_object(m)->as_method();
534 }
536 // ------------------------------------------------------------------
537 // ciInstanceKlass::is_leaf_type
538 bool ciInstanceKlass::is_leaf_type() {
539 assert(is_loaded(), "must be loaded");
540 if (is_shared()) {
541 return is_final(); // approximately correct
542 } else {
543 return !_has_subklass && (_nof_implementors == 0);
544 }
545 }
547 // ------------------------------------------------------------------
548 // ciInstanceKlass::implementor
549 //
550 // Report an implementor of this interface.
551 // Returns NULL if exact information is not available.
552 // Note that there are various races here, since my copy
553 // of _nof_implementors might be out of date with respect
554 // to results returned by instanceKlass::implementor.
555 // This is OK, since any dependencies we decide to assert
556 // will be checked later under the Compile_lock.
557 ciInstanceKlass* ciInstanceKlass::implementor(int n) {
558 if (n >= implementors_limit) {
559 return NULL;
560 }
561 ciInstanceKlass* impl = _implementors[n];
562 if (impl == NULL) {
563 if (_nof_implementors > implementors_limit) {
564 return NULL;
565 }
566 // Go into the VM to fetch the implementor.
567 {
568 VM_ENTRY_MARK;
569 klassOop k = get_instanceKlass()->implementor(n);
570 if (k != NULL) {
571 impl = CURRENT_THREAD_ENV->get_object(k)->as_instance_klass();
572 }
573 }
574 // Memoize this result.
575 if (!is_shared()) {
576 _implementors[n] = (impl == NULL)? this: impl;
577 }
578 } else if (impl == this) {
579 impl = NULL; // memoized null result from a VM query
580 }
581 return impl;
582 }