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comparison src/share/vm/runtime/biasedLocking.cpp @ 6983:070d523b96a7

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8001471: Klass::cast() does nothing Summary: Remove function Klass::cast() and calls to it. Reviewed-by: dholmes, coleenp
author hseigel
date Mon, 12 Nov 2012 16:15:05 -0500
parents 22b8d3d181d9
children 190899198332
comparison
equal deleted inserted replaced
6981:8c413497f434 6983:070d523b96a7
37 37
38 static GrowableArray<Handle>* _preserved_oop_stack = NULL; 38 static GrowableArray<Handle>* _preserved_oop_stack = NULL;
39 static GrowableArray<markOop>* _preserved_mark_stack = NULL; 39 static GrowableArray<markOop>* _preserved_mark_stack = NULL;
40 40
41 static void enable_biased_locking(Klass* k) { 41 static void enable_biased_locking(Klass* k) {
42 Klass::cast(k)->set_prototype_header(markOopDesc::biased_locking_prototype()); 42 k->set_prototype_header(markOopDesc::biased_locking_prototype());
43 } 43 }
44 44
45 class VM_EnableBiasedLocking: public VM_Operation { 45 class VM_EnableBiasedLocking: public VM_Operation {
46 private: 46 private:
47 bool _is_cheap_allocated; 47 bool _is_cheap_allocated;
147 markOop mark = obj->mark(); 147 markOop mark = obj->mark();
148 if (!mark->has_bias_pattern()) { 148 if (!mark->has_bias_pattern()) {
149 if (TraceBiasedLocking) { 149 if (TraceBiasedLocking) {
150 ResourceMark rm; 150 ResourceMark rm;
151 tty->print_cr(" (Skipping revocation of object of type %s because it's no longer biased)", 151 tty->print_cr(" (Skipping revocation of object of type %s because it's no longer biased)",
152 Klass::cast(obj->klass())->external_name()); 152 obj->klass()->external_name());
153 } 153 }
154 return BiasedLocking::NOT_BIASED; 154 return BiasedLocking::NOT_BIASED;
155 } 155 }
156 156
157 uint age = mark->age(); 157 uint age = mark->age();
159 markOop unbiased_prototype = markOopDesc::prototype()->set_age(age); 159 markOop unbiased_prototype = markOopDesc::prototype()->set_age(age);
160 160
161 if (TraceBiasedLocking && (Verbose || !is_bulk)) { 161 if (TraceBiasedLocking && (Verbose || !is_bulk)) {
162 ResourceMark rm; 162 ResourceMark rm;
163 tty->print_cr("Revoking bias of object " INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s , prototype header " INTPTR_FORMAT " , allow rebias %d , requesting thread " INTPTR_FORMAT, 163 tty->print_cr("Revoking bias of object " INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s , prototype header " INTPTR_FORMAT " , allow rebias %d , requesting thread " INTPTR_FORMAT,
164 (intptr_t) obj, (intptr_t) mark, Klass::cast(obj->klass())->external_name(), (intptr_t) Klass::cast(obj->klass())->prototype_header(), (allow_rebias ? 1 : 0), (intptr_t) requesting_thread); 164 (intptr_t) obj, (intptr_t) mark, obj->klass()->external_name(), (intptr_t) obj->klass()->prototype_header(), (allow_rebias ? 1 : 0), (intptr_t) requesting_thread);
165 } 165 }
166 166
167 JavaThread* biased_thread = mark->biased_locker(); 167 JavaThread* biased_thread = mark->biased_locker();
168 if (biased_thread == NULL) { 168 if (biased_thread == NULL) {
169 // Object is anonymously biased. We can get here if, for 169 // Object is anonymously biased. We can get here if, for
324 324
325 if (TraceBiasedLocking) { 325 if (TraceBiasedLocking) {
326 tty->print_cr("* Beginning bulk revocation (kind == %s) because of object " 326 tty->print_cr("* Beginning bulk revocation (kind == %s) because of object "
327 INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s", 327 INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s",
328 (bulk_rebias ? "rebias" : "revoke"), 328 (bulk_rebias ? "rebias" : "revoke"),
329 (intptr_t) o, (intptr_t) o->mark(), Klass::cast(o->klass())->external_name()); 329 (intptr_t) o, (intptr_t) o->mark(), o->klass()->external_name());
330 } 330 }
331 331
332 jlong cur_time = os::javaTimeMillis(); 332 jlong cur_time = os::javaTimeMillis();
333 o->klass()->set_last_biased_lock_bulk_revocation_time(cur_time); 333 o->klass()->set_last_biased_lock_bulk_revocation_time(cur_time);
334 334
335 335
336 Klass* k_o = o->klass(); 336 Klass* k_o = o->klass();
337 Klass* klass = Klass::cast(k_o); 337 Klass* klass = k_o;
338 338
339 if (bulk_rebias) { 339 if (bulk_rebias) {
340 // Use the epoch in the klass of the object to implicitly revoke 340 // Use the epoch in the klass of the object to implicitly revoke
341 // all biases of objects of this data type and force them to be 341 // all biases of objects of this data type and force them to be
342 // reacquired. However, we also need to walk the stacks of all 342 // reacquired. However, we also need to walk the stacks of all
544 markOop res_mark = (markOop) Atomic::cmpxchg_ptr(unbiased_prototype, obj->mark_addr(), mark); 544 markOop res_mark = (markOop) Atomic::cmpxchg_ptr(unbiased_prototype, obj->mark_addr(), mark);
545 if (res_mark == biased_value) { 545 if (res_mark == biased_value) {
546 return BIAS_REVOKED; 546 return BIAS_REVOKED;
547 } 547 }
548 } else if (mark->has_bias_pattern()) { 548 } else if (mark->has_bias_pattern()) {
549 Klass* k = Klass::cast(obj->klass()); 549 Klass* k = obj->klass();
550 markOop prototype_header = k->prototype_header(); 550 markOop prototype_header = k->prototype_header();
551 if (!prototype_header->has_bias_pattern()) { 551 if (!prototype_header->has_bias_pattern()) {
552 // This object has a stale bias from before the bulk revocation 552 // This object has a stale bias from before the bulk revocation
553 // for this data type occurred. It's pointless to update the 553 // for this data type occurred. It's pointless to update the
554 // heuristics at this point so simply update the header with a 554 // heuristics at this point so simply update the header with a
588 588
589 HeuristicsResult heuristics = update_heuristics(obj(), attempt_rebias); 589 HeuristicsResult heuristics = update_heuristics(obj(), attempt_rebias);
590 if (heuristics == HR_NOT_BIASED) { 590 if (heuristics == HR_NOT_BIASED) {
591 return NOT_BIASED; 591 return NOT_BIASED;
592 } else if (heuristics == HR_SINGLE_REVOKE) { 592 } else if (heuristics == HR_SINGLE_REVOKE) {
593 Klass *k = Klass::cast(obj->klass()); 593 Klass *k = obj->klass();
594 markOop prototype_header = k->prototype_header(); 594 markOop prototype_header = k->prototype_header();
595 if (mark->biased_locker() == THREAD && 595 if (mark->biased_locker() == THREAD &&
596 prototype_header->bias_epoch() == mark->bias_epoch()) { 596 prototype_header->bias_epoch() == mark->bias_epoch()) {
597 // A thread is trying to revoke the bias of an object biased 597 // A thread is trying to revoke the bias of an object biased
598 // toward it, again likely due to an identity hash code 598 // toward it, again likely due to an identity hash code