1 /*
2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_constantPoolKlass.cpp.incl"
27
28 constantPoolOop constantPoolKlass::allocate(int length, TRAPS) {
29 int size = constantPoolOopDesc::object_size(length);
30 KlassHandle klass (THREAD, as_klassOop());
31 constantPoolOop c =
32 (constantPoolOop)CollectedHeap::permanent_obj_allocate(klass, size, CHECK_NULL);
33
34 c->set_length(length);
35 c->set_tags(NULL);
36 c->set_cache(NULL);
37 c->set_pool_holder(NULL);
38 c->set_flags(0);
39 // only set to non-zero if constant pool is merged by RedefineClasses
40 c->set_orig_length(0);
41 // all fields are initialized; needed for GC
42
43 // initialize tag array
44 // Note: cannot introduce constant pool handle before since it is not
45 // completely initialized (no class) -> would cause assertion failure
46 constantPoolHandle pool (THREAD, c);
47 typeArrayOop t_oop = oopFactory::new_permanent_byteArray(length, CHECK_NULL);
48 typeArrayHandle tags (THREAD, t_oop);
49 for (int index = 0; index < length; index++) {
50 tags()->byte_at_put(index, JVM_CONSTANT_Invalid);
51 }
52 pool->set_tags(tags());
53
54 return pool();
55 }
56
57 klassOop constantPoolKlass::create_klass(TRAPS) {
58 constantPoolKlass o;
59 KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());
60 KlassHandle k = base_create_klass(h_this_klass, header_size(), o.vtbl_value(), CHECK_NULL);
61 // Make sure size calculation is right
62 assert(k()->size() == align_object_size(header_size()), "wrong size for object");
63 java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror
64 return k();
65 }
66
67 int constantPoolKlass::oop_size(oop obj) const {
68 assert(obj->is_constantPool(), "must be constantPool");
69 return constantPoolOop(obj)->object_size();
70 }
71
72
73 void constantPoolKlass::oop_follow_contents(oop obj) {
74 assert (obj->is_constantPool(), "obj must be constant pool");
75 constantPoolOop cp = (constantPoolOop) obj;
76 // Performance tweak: We skip iterating over the klass pointer since we
77 // know that Universe::constantPoolKlassObj never moves.
78
79 // If the tags array is null we are in the middle of allocating this constant pool
80 if (cp->tags() != NULL) {
81 // gc of constant pool contents
82 oop* base = (oop*)cp->base();
83 for (int i = 0; i < cp->length(); i++) {
84 if (cp->is_pointer_entry(i)) {
85 if (*base != NULL) MarkSweep::mark_and_push(base);
86 }
87 base++;
88 }
89 // gc of constant pool instance variables
90 MarkSweep::mark_and_push(cp->tags_addr());
91 MarkSweep::mark_and_push(cp->cache_addr());
92 MarkSweep::mark_and_push(cp->pool_holder_addr());
93 }
94 }
95
96 #ifndef SERIALGC
97 void constantPoolKlass::oop_follow_contents(ParCompactionManager* cm,
98 oop obj) {
99 assert (obj->is_constantPool(), "obj must be constant pool");
100 constantPoolOop cp = (constantPoolOop) obj;
101 // Performance tweak: We skip iterating over the klass pointer since we
102 // know that Universe::constantPoolKlassObj never moves.
103
104 // If the tags array is null we are in the middle of allocating this constant
105 // pool.
106 if (cp->tags() != NULL) {
107 // gc of constant pool contents
108 oop* base = (oop*)cp->base();
109 for (int i = 0; i < cp->length(); i++) {
110 if (cp->is_pointer_entry(i)) {
111 if (*base != NULL) PSParallelCompact::mark_and_push(cm, base);
112 }
113 base++;
114 }
115 // gc of constant pool instance variables
116 PSParallelCompact::mark_and_push(cm, cp->tags_addr());
117 PSParallelCompact::mark_and_push(cm, cp->cache_addr());
118 PSParallelCompact::mark_and_push(cm, cp->pool_holder_addr());
119 }
120 }
121 #endif // SERIALGC
122
123
124 int constantPoolKlass::oop_adjust_pointers(oop obj) {
125 assert (obj->is_constantPool(), "obj must be constant pool");
126 constantPoolOop cp = (constantPoolOop) obj;
127 // Get size before changing pointers.
128 // Don't call size() or oop_size() since that is a virtual call.
129 int size = cp->object_size();
130 // Performance tweak: We skip iterating over the klass pointer since we
131 // know that Universe::constantPoolKlassObj never moves.
132
133 // If the tags array is null we are in the middle of allocating this constant
134 // pool.
135 if (cp->tags() != NULL) {
136 oop* base = (oop*)cp->base();
137 for (int i = 0; i< cp->length(); i++) {
138 if (cp->is_pointer_entry(i)) {
139 MarkSweep::adjust_pointer(base);
140 }
141 base++;
142 }
143 }
144 MarkSweep::adjust_pointer(cp->tags_addr());
145 MarkSweep::adjust_pointer(cp->cache_addr());
146 MarkSweep::adjust_pointer(cp->pool_holder_addr());
147 return size;
148 }
149
150
151 int constantPoolKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
152 assert (obj->is_constantPool(), "obj must be constant pool");
153 // Performance tweak: We skip iterating over the klass pointer since we
154 // know that Universe::constantPoolKlassObj never moves.
155 constantPoolOop cp = (constantPoolOop) obj;
156 // Get size before changing pointers.
157 // Don't call size() or oop_size() since that is a virtual call.
158 int size = cp->object_size();
159
160 // If the tags array is null we are in the middle of allocating this constant
161 // pool.
162 if (cp->tags() != NULL) {
163 oop* base = (oop*)cp->base();
164 for (int i = 0; i < cp->length(); i++) {
165 if (cp->is_pointer_entry(i)) {
166 blk->do_oop(base);
167 }
168 base++;
169 }
170 }
171 blk->do_oop(cp->tags_addr());
172 blk->do_oop(cp->cache_addr());
173 blk->do_oop(cp->pool_holder_addr());
174 return size;
175 }
176
177
178 int constantPoolKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
179 assert (obj->is_constantPool(), "obj must be constant pool");
180 // Performance tweak: We skip iterating over the klass pointer since we
181 // know that Universe::constantPoolKlassObj never moves.
182 constantPoolOop cp = (constantPoolOop) obj;
183 // Get size before changing pointers.
184 // Don't call size() or oop_size() since that is a virtual call.
185 int size = cp->object_size();
186
187 // If the tags array is null we are in the middle of allocating this constant
188 // pool.
189 if (cp->tags() != NULL) {
190 oop* base = (oop*)cp->base();
191 for (int i = 0; i < cp->length(); i++) {
192 if (mr.contains(base)) {
193 if (cp->is_pointer_entry(i)) {
194 blk->do_oop(base);
195 }
196 }
197 base++;
198 }
199 }
200 oop* addr;
201 addr = cp->tags_addr();
202 blk->do_oop(addr);
203 addr = cp->cache_addr();
204 blk->do_oop(addr);
205 addr = cp->pool_holder_addr();
206 blk->do_oop(addr);
207 return size;
208 }
209
210 #ifndef SERIALGC
211 int constantPoolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
212 assert (obj->is_constantPool(), "obj must be constant pool");
213 constantPoolOop cp = (constantPoolOop) obj;
214
215 // If the tags array is null we are in the middle of allocating this constant
216 // pool.
217 if (cp->tags() != NULL) {
218 oop* base = (oop*)cp->base();
219 for (int i = 0; i < cp->length(); ++i, ++base) {
220 if (cp->is_pointer_entry(i)) {
221 PSParallelCompact::adjust_pointer(base);
222 }
223 }
224 }
225 PSParallelCompact::adjust_pointer(cp->tags_addr());
226 PSParallelCompact::adjust_pointer(cp->cache_addr());
227 PSParallelCompact::adjust_pointer(cp->pool_holder_addr());
228 return cp->object_size();
229 }
230
231 int
232 constantPoolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,
233 HeapWord* beg_addr, HeapWord* end_addr) {
234 assert (obj->is_constantPool(), "obj must be constant pool");
235 constantPoolOop cp = (constantPoolOop) obj;
236
237 // If the tags array is null we are in the middle of allocating this constant
238 // pool.
239 if (cp->tags() != NULL) {
240 oop* base = (oop*)cp->base();
241 oop* const beg_oop = MAX2((oop*)beg_addr, base);
242 oop* const end_oop = MIN2((oop*)end_addr, base + cp->length());
243 const size_t beg_idx = pointer_delta(beg_oop, base, sizeof(oop*));
244 const size_t end_idx = pointer_delta(end_oop, base, sizeof(oop*));
245 for (size_t cur_idx = beg_idx; cur_idx < end_idx; ++cur_idx, ++base) {
246 if (cp->is_pointer_entry(int(cur_idx))) {
247 PSParallelCompact::adjust_pointer(base);
248 }
249 }
250 }
251
252 oop* p;
253 p = cp->tags_addr();
254 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
255 p = cp->cache_addr();
256 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
257 p = cp->pool_holder_addr();
258 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
259
260 return cp->object_size();
261 }
262
263 void constantPoolKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) {
264 assert(obj->is_constantPool(), "should be constant pool");
265 constantPoolOop cp = (constantPoolOop) obj;
266 if (AnonymousClasses && cp->has_pseudo_string() && cp->tags() != NULL) {
267 oop* base = (oop*)cp->base();
268 for (int i = 0; i < cp->length(); ++i, ++base) {
269 if (cp->tag_at(i).is_string()) {
270 if (PSScavenge::should_scavenge(base)) {
271 pm->claim_or_forward_breadth(base);
272 }
273 }
274 }
275 }
276 }
277
278 void constantPoolKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
279 assert(obj->is_constantPool(), "should be constant pool");
280 constantPoolOop cp = (constantPoolOop) obj;
281 if (AnonymousClasses && cp->has_pseudo_string() && cp->tags() != NULL) {
282 oop* base = (oop*)cp->base();
283 for (int i = 0; i < cp->length(); ++i, ++base) {
284 if (cp->tag_at(i).is_string()) {
285 if (PSScavenge::should_scavenge(base)) {
286 pm->claim_or_forward_depth(base);
287 }
288 }
289 }
290 }
291 }
292 #endif // SERIALGC
293
294 #ifndef PRODUCT
295
296 // Printing
297
298 void constantPoolKlass::oop_print_on(oop obj, outputStream* st) {
299 EXCEPTION_MARK;
300 oop anObj;
301 assert(obj->is_constantPool(), "must be constantPool");
302 Klass::oop_print_on(obj, st);
303 constantPoolOop cp = constantPoolOop(obj);
304 if (cp->flags() != 0) {
305 st->print(" - flags : 0x%x", cp->flags());
306 if (cp->has_pseudo_string()) st->print(" has_pseudo_string");
307 st->cr();
308 }
309
310 // Temp. remove cache so we can do lookups with original indicies.
311 constantPoolCacheHandle cache (THREAD, cp->cache());
312 cp->set_cache(NULL);
313
314 for (int index = 1; index < cp->length(); index++) { // Index 0 is unused
315 st->print(" - %3d : ", index);
316 cp->tag_at(index).print_on(st);
317 st->print(" : ");
318 switch (cp->tag_at(index).value()) {
319 case JVM_CONSTANT_Class :
320 { anObj = cp->klass_at(index, CATCH);
321 anObj->print_value_on(st);
322 st->print(" {0x%lx}", (address)anObj);
323 }
324 break;
325 case JVM_CONSTANT_Fieldref :
326 case JVM_CONSTANT_Methodref :
327 case JVM_CONSTANT_InterfaceMethodref :
328 st->print("klass_index=%d", cp->klass_ref_index_at(index));
329 st->print(" name_and_type_index=%d", cp->name_and_type_ref_index_at(index));
330 break;
331 case JVM_CONSTANT_UnresolvedString :
332 case JVM_CONSTANT_String :
333 if (cp->is_pseudo_string_at(index)) {
334 anObj = cp->pseudo_string_at(index);
335 } else {
336 anObj = cp->string_at(index, CATCH);
337 }
338 anObj->print_value_on(st);
339 st->print(" {0x%lx}", (address)anObj);
340 break;
341 case JVM_CONSTANT_Integer :
342 st->print("%d", cp->int_at(index));
343 break;
344 case JVM_CONSTANT_Float :
345 st->print("%f", cp->float_at(index));
346 break;
347 case JVM_CONSTANT_Long :
348 st->print_jlong(cp->long_at(index));
349 index++; // Skip entry following eigth-byte constant
350 break;
351 case JVM_CONSTANT_Double :
352 st->print("%lf", cp->double_at(index));
353 index++; // Skip entry following eigth-byte constant
354 break;
355 case JVM_CONSTANT_NameAndType :
356 st->print("name_index=%d", cp->name_ref_index_at(index));
357 st->print(" signature_index=%d", cp->signature_ref_index_at(index));
358 break;
359 case JVM_CONSTANT_Utf8 :
360 cp->symbol_at(index)->print_value_on(st);
361 break;
362 case JVM_CONSTANT_UnresolvedClass : // fall-through
363 case JVM_CONSTANT_UnresolvedClassInError: {
364 // unresolved_klass_at requires lock or safe world.
365 oop entry = *cp->obj_at_addr(index);
366 entry->print_value_on(st);
367 }
368 break;
369 default:
370 ShouldNotReachHere();
371 break;
372 }
373 st->cr();
374 }
375 st->cr();
376
377 // Restore cache
378 cp->set_cache(cache());
379 }
380
381
382 #endif
383
384 const char* constantPoolKlass::internal_name() const {
385 return "{constant pool}";
386 }
387
388 // Verification
389
390 void constantPoolKlass::oop_verify_on(oop obj, outputStream* st) {
391 Klass::oop_verify_on(obj, st);
392 guarantee(obj->is_constantPool(), "object must be constant pool");
393 constantPoolOop cp = constantPoolOop(obj);
394 guarantee(cp->is_perm(), "should be in permspace");
395 if (!cp->partially_loaded()) {
396 oop* base = (oop*)cp->base();
397 for (int i = 0; i< cp->length(); i++) {
398 if (cp->tag_at(i).is_klass()) {
399 guarantee((*base)->is_perm(), "should be in permspace");
400 guarantee((*base)->is_klass(), "should be klass");
401 }
402 if (cp->tag_at(i).is_unresolved_klass()) {
403 guarantee((*base)->is_perm(), "should be in permspace");
404 guarantee((*base)->is_symbol() || (*base)->is_klass(),
405 "should be symbol or klass");
406 }
407 if (cp->tag_at(i).is_symbol()) {
408 guarantee((*base)->is_perm(), "should be in permspace");
409 guarantee((*base)->is_symbol(), "should be symbol");
410 }
411 if (cp->tag_at(i).is_unresolved_string()) {
412 guarantee((*base)->is_perm(), "should be in permspace");
413 guarantee((*base)->is_symbol() || (*base)->is_instance(),
414 "should be symbol or instance");
415 }
416 if (cp->tag_at(i).is_string()) {
417 if (!cp->has_pseudo_string()) {
418 guarantee((*base)->is_perm(), "should be in permspace");
419 guarantee((*base)->is_instance(), "should be instance");
420 } else {
421 // can be non-perm, can be non-instance (array)
422 }
423 }
424 base++;
425 }
426 guarantee(cp->tags()->is_perm(), "should be in permspace");
427 guarantee(cp->tags()->is_typeArray(), "should be type array");
428 if (cp->cache() != NULL) {
429 // Note: cache() can be NULL before a class is completely setup or
430 // in temporary constant pools used during constant pool merging
431 guarantee(cp->cache()->is_perm(), "should be in permspace");
432 guarantee(cp->cache()->is_constantPoolCache(), "should be constant pool cache");
433 }
434 if (cp->pool_holder() != NULL) {
435 // Note: pool_holder() can be NULL in temporary constant pools
436 // used during constant pool merging
437 guarantee(cp->pool_holder()->is_perm(), "should be in permspace");
438 guarantee(cp->pool_holder()->is_klass(), "should be klass");
439 }
440 }
441 }
442
443 bool constantPoolKlass::oop_partially_loaded(oop obj) const {
444 assert(obj->is_constantPool(), "object must be constant pool");
445 constantPoolOop cp = constantPoolOop(obj);
446 return cp->tags() == NULL || cp->pool_holder() == (klassOop) cp; // Check whether pool holder points to self
447 }
448
449
450 void constantPoolKlass::oop_set_partially_loaded(oop obj) {
451 assert(obj->is_constantPool(), "object must be constant pool");
452 constantPoolOop cp = constantPoolOop(obj);
453 assert(cp->pool_holder() == NULL, "just checking");
454 cp->set_pool_holder((klassOop) cp); // Temporarily set pool holder to point to self
455 }
456
457 #ifndef PRODUCT
458 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
459 void constantPoolKlass::preload_and_initialize_all_classes(oop obj, TRAPS) {
460 guarantee(obj->is_constantPool(), "object must be constant pool");
461 constantPoolHandle cp(THREAD, (constantPoolOop)obj);
462 guarantee(!cp->partially_loaded(), "must be fully loaded");
463
464 for (int i = 0; i< cp->length(); i++) {
465 if (cp->tag_at(i).is_unresolved_klass()) {
466 // This will force loading of the class
467 klassOop klass = cp->klass_at(i, CHECK);
468 if (klass->is_instance()) {
469 // Force initialization of class
470 instanceKlass::cast(klass)->initialize(CHECK);
471 }
472 }
473 }
474 }
475
476 #endif