author | trims |
Thu, 27 May 2010 19:08:38 -0700 | |
changeset 5547 | f4b087cbb361 |
parent 5080 | eff0cc882603 |
child 6762 | f8d1b560700e |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
|
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "incls/_precompiled.incl" |
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#include "incls/_markSweep.cpp.incl" |
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||
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GrowableArray<oop>* MarkSweep::_marking_stack = NULL; |
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GrowableArray<ObjArrayTask>* MarkSweep::_objarray_stack = NULL; |
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GrowableArray<Klass*>* MarkSweep::_revisit_klass_stack = NULL; |
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GrowableArray<DataLayout*>* MarkSweep::_revisit_mdo_stack = NULL; |
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GrowableArray<oop>* MarkSweep::_preserved_oop_stack = NULL; |
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GrowableArray<markOop>* MarkSweep::_preserved_mark_stack= NULL; |
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size_t MarkSweep::_preserved_count = 0; |
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size_t MarkSweep::_preserved_count_max = 0; |
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PreservedMark* MarkSweep::_preserved_marks = NULL; |
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ReferenceProcessor* MarkSweep::_ref_processor = NULL; |
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#ifdef VALIDATE_MARK_SWEEP |
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GrowableArray<void*>* MarkSweep::_root_refs_stack = NULL; |
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GrowableArray<oop> * MarkSweep::_live_oops = NULL; |
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GrowableArray<oop> * MarkSweep::_live_oops_moved_to = NULL; |
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GrowableArray<size_t>* MarkSweep::_live_oops_size = NULL; |
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size_t MarkSweep::_live_oops_index = 0; |
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size_t MarkSweep::_live_oops_index_at_perm = 0; |
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GrowableArray<void*>* MarkSweep::_other_refs_stack = NULL; |
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GrowableArray<void*>* MarkSweep::_adjusted_pointers = NULL; |
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bool MarkSweep::_pointer_tracking = false; |
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bool MarkSweep::_root_tracking = true; |
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GrowableArray<HeapWord*>* MarkSweep::_cur_gc_live_oops = NULL; |
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GrowableArray<HeapWord*>* MarkSweep::_cur_gc_live_oops_moved_to = NULL; |
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GrowableArray<size_t> * MarkSweep::_cur_gc_live_oops_size = NULL; |
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GrowableArray<HeapWord*>* MarkSweep::_last_gc_live_oops = NULL; |
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GrowableArray<HeapWord*>* MarkSweep::_last_gc_live_oops_moved_to = NULL; |
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GrowableArray<size_t> * MarkSweep::_last_gc_live_oops_size = NULL; |
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#endif |
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void MarkSweep::revisit_weak_klass_link(Klass* k) { |
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_revisit_klass_stack->push(k); |
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} |
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void MarkSweep::follow_weak_klass_links() { |
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// All klasses on the revisit stack are marked at this point. |
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// Update and follow all subklass, sibling and implementor links. |
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if (PrintRevisitStats) { |
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gclog_or_tty->print_cr("#classes in system dictionary = %d", SystemDictionary::number_of_classes()); |
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gclog_or_tty->print_cr("Revisit klass stack length = %d", _revisit_klass_stack->length()); |
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} |
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for (int i = 0; i < _revisit_klass_stack->length(); i++) { |
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_revisit_klass_stack->at(i)->follow_weak_klass_links(&is_alive,&keep_alive); |
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} |
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follow_stack(); |
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} |
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void MarkSweep::revisit_mdo(DataLayout* p) { |
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_revisit_mdo_stack->push(p); |
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} |
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void MarkSweep::follow_mdo_weak_refs() { |
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// All strongly reachable oops have been marked at this point; |
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// we can visit and clear any weak references from MDO's which |
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// we memoized during the strong marking phase. |
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assert(_marking_stack->is_empty(), "Marking stack should be empty"); |
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if (PrintRevisitStats) { |
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gclog_or_tty->print_cr("#classes in system dictionary = %d", SystemDictionary::number_of_classes()); |
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gclog_or_tty->print_cr("Revisit MDO stack length = %d", _revisit_mdo_stack->length()); |
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} |
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for (int i = 0; i < _revisit_mdo_stack->length(); i++) { |
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_revisit_mdo_stack->at(i)->follow_weak_refs(&is_alive); |
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} |
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follow_stack(); |
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} |
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MarkSweep::FollowRootClosure MarkSweep::follow_root_closure; |
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CodeBlobToOopClosure MarkSweep::follow_code_root_closure(&MarkSweep::follow_root_closure, /*do_marking=*/ true); |
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void MarkSweep::FollowRootClosure::do_oop(oop* p) { follow_root(p); } |
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void MarkSweep::FollowRootClosure::do_oop(narrowOop* p) { follow_root(p); } |
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MarkSweep::MarkAndPushClosure MarkSweep::mark_and_push_closure; |
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void MarkSweep::MarkAndPushClosure::do_oop(oop* p) { mark_and_push(p); } |
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void MarkSweep::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(p); } |
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void MarkSweep::follow_stack() { |
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do { |
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while (!_marking_stack->is_empty()) { |
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oop obj = _marking_stack->pop(); |
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assert (obj->is_gc_marked(), "p must be marked"); |
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obj->follow_contents(); |
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} |
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// Process ObjArrays one at a time to avoid marking stack bloat. |
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if (!_objarray_stack->is_empty()) { |
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ObjArrayTask task = _objarray_stack->pop(); |
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objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint(); |
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k->oop_follow_contents(task.obj(), task.index()); |
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} |
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} while (!_marking_stack->is_empty() || !_objarray_stack->is_empty()); |
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} |
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MarkSweep::FollowStackClosure MarkSweep::follow_stack_closure; |
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void MarkSweep::FollowStackClosure::do_void() { follow_stack(); } |
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// We preserve the mark which should be replaced at the end and the location that it |
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// will go. Note that the object that this markOop belongs to isn't currently at that |
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// address but it will be after phase4 |
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void MarkSweep::preserve_mark(oop obj, markOop mark) { |
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// we try to store preserved marks in the to space of the new generation since this |
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// is storage which should be available. Most of the time this should be sufficient |
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// space for the marks we need to preserve but if it isn't we fall back in using |
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// GrowableArrays to keep track of the overflow. |
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if (_preserved_count < _preserved_count_max) { |
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_preserved_marks[_preserved_count++].init(obj, mark); |
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} else { |
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if (_preserved_mark_stack == NULL) { |
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_preserved_mark_stack = new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); |
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_preserved_oop_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); |
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} |
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_preserved_mark_stack->push(mark); |
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_preserved_oop_stack->push(obj); |
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} |
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} |
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MarkSweep::AdjustPointerClosure MarkSweep::adjust_root_pointer_closure(true); |
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MarkSweep::AdjustPointerClosure MarkSweep::adjust_pointer_closure(false); |
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void MarkSweep::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p, _is_root); } |
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void MarkSweep::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p, _is_root); } |
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void MarkSweep::adjust_marks() { |
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assert(_preserved_oop_stack == NULL || |
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_preserved_oop_stack->length() == _preserved_mark_stack->length(), |
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"inconsistent preserved oop stacks"); |
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// adjust the oops we saved earlier |
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for (size_t i = 0; i < _preserved_count; i++) { |
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_preserved_marks[i].adjust_pointer(); |
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} |
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// deal with the overflow stack |
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if (_preserved_oop_stack) { |
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for (int i = 0; i < _preserved_oop_stack->length(); i++) { |
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oop* p = _preserved_oop_stack->adr_at(i); |
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adjust_pointer(p); |
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} |
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} |
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} |
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void MarkSweep::restore_marks() { |
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assert(_preserved_oop_stack == NULL || |
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_preserved_oop_stack->length() == _preserved_mark_stack->length(), |
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"inconsistent preserved oop stacks"); |
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if (PrintGC && Verbose) { |
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gclog_or_tty->print_cr("Restoring %d marks", _preserved_count + |
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(_preserved_oop_stack ? _preserved_oop_stack->length() : 0)); |
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} |
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// restore the marks we saved earlier |
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for (size_t i = 0; i < _preserved_count; i++) { |
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_preserved_marks[i].restore(); |
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} |
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// deal with the overflow |
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if (_preserved_oop_stack) { |
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for (int i = 0; i < _preserved_oop_stack->length(); i++) { |
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oop obj = _preserved_oop_stack->at(i); |
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markOop mark = _preserved_mark_stack->at(i); |
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obj->set_mark(mark); |
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} |
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} |
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} |
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#ifdef VALIDATE_MARK_SWEEP |
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void MarkSweep::track_adjusted_pointer(void* p, bool isroot) { |
1 | 199 |
if (!ValidateMarkSweep) |
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return; |
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if (!isroot) { |
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if (_pointer_tracking) { |
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guarantee(_adjusted_pointers->contains(p), "should have seen this pointer"); |
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_adjusted_pointers->remove(p); |
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} |
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} else { |
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ptrdiff_t index = _root_refs_stack->find(p); |
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if (index != -1) { |
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int l = _root_refs_stack->length(); |
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if (l > 0 && l - 1 != index) { |
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void* last = _root_refs_stack->pop(); |
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assert(last != p, "should be different"); |
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_root_refs_stack->at_put(index, last); |
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} else { |
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_root_refs_stack->remove(p); |
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} |
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} |
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} |
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} |
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void MarkSweep::check_adjust_pointer(void* p) { |
1 | 223 |
_adjusted_pointers->push(p); |
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} |
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class AdjusterTracker: public OopClosure { |
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public: |
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AdjusterTracker() {} |
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void do_oop(oop* o) { MarkSweep::check_adjust_pointer(o); } |
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void do_oop(narrowOop* o) { MarkSweep::check_adjust_pointer(o); } |
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}; |
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233 |
void MarkSweep::track_interior_pointers(oop obj) { |
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234 |
if (ValidateMarkSweep) { |
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235 |
_adjusted_pointers->clear(); |
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236 |
_pointer_tracking = true; |
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237 |
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238 |
AdjusterTracker checker; |
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239 |
obj->oop_iterate(&checker); |
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240 |
} |
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241 |
} |
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242 |
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243 |
void MarkSweep::check_interior_pointers() { |
|
244 |
if (ValidateMarkSweep) { |
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245 |
_pointer_tracking = false; |
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246 |
guarantee(_adjusted_pointers->length() == 0, "should have processed the same pointers"); |
|
247 |
} |
|
248 |
} |
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249 |
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250 |
void MarkSweep::reset_live_oop_tracking(bool at_perm) { |
|
251 |
if (ValidateMarkSweep) { |
|
252 |
guarantee((size_t)_live_oops->length() == _live_oops_index, "should be at end of live oops"); |
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253 |
_live_oops_index = at_perm ? _live_oops_index_at_perm : 0; |
|
254 |
} |
|
255 |
} |
|
256 |
||
257 |
void MarkSweep::register_live_oop(oop p, size_t size) { |
|
258 |
if (ValidateMarkSweep) { |
|
259 |
_live_oops->push(p); |
|
260 |
_live_oops_size->push(size); |
|
261 |
_live_oops_index++; |
|
262 |
} |
|
263 |
} |
|
264 |
||
265 |
void MarkSweep::validate_live_oop(oop p, size_t size) { |
|
266 |
if (ValidateMarkSweep) { |
|
267 |
oop obj = _live_oops->at((int)_live_oops_index); |
|
268 |
guarantee(obj == p, "should be the same object"); |
|
269 |
guarantee(_live_oops_size->at((int)_live_oops_index) == size, "should be the same size"); |
|
270 |
_live_oops_index++; |
|
271 |
} |
|
272 |
} |
|
273 |
||
274 |
void MarkSweep::live_oop_moved_to(HeapWord* q, size_t size, |
|
275 |
HeapWord* compaction_top) { |
|
276 |
assert(oop(q)->forwardee() == NULL || oop(q)->forwardee() == oop(compaction_top), |
|
277 |
"should be moved to forwarded location"); |
|
278 |
if (ValidateMarkSweep) { |
|
279 |
MarkSweep::validate_live_oop(oop(q), size); |
|
280 |
_live_oops_moved_to->push(oop(compaction_top)); |
|
281 |
} |
|
282 |
if (RecordMarkSweepCompaction) { |
|
283 |
_cur_gc_live_oops->push(q); |
|
284 |
_cur_gc_live_oops_moved_to->push(compaction_top); |
|
285 |
_cur_gc_live_oops_size->push(size); |
|
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} |
|
287 |
} |
|
288 |
||
289 |
void MarkSweep::compaction_complete() { |
|
290 |
if (RecordMarkSweepCompaction) { |
|
291 |
GrowableArray<HeapWord*>* _tmp_live_oops = _cur_gc_live_oops; |
|
292 |
GrowableArray<HeapWord*>* _tmp_live_oops_moved_to = _cur_gc_live_oops_moved_to; |
|
293 |
GrowableArray<size_t> * _tmp_live_oops_size = _cur_gc_live_oops_size; |
|
294 |
||
295 |
_cur_gc_live_oops = _last_gc_live_oops; |
|
296 |
_cur_gc_live_oops_moved_to = _last_gc_live_oops_moved_to; |
|
297 |
_cur_gc_live_oops_size = _last_gc_live_oops_size; |
|
298 |
_last_gc_live_oops = _tmp_live_oops; |
|
299 |
_last_gc_live_oops_moved_to = _tmp_live_oops_moved_to; |
|
300 |
_last_gc_live_oops_size = _tmp_live_oops_size; |
|
301 |
} |
|
302 |
} |
|
303 |
||
304 |
void MarkSweep::print_new_location_of_heap_address(HeapWord* q) { |
|
305 |
if (!RecordMarkSweepCompaction) { |
|
306 |
tty->print_cr("Requires RecordMarkSweepCompaction to be enabled"); |
|
307 |
return; |
|
308 |
} |
|
309 |
||
310 |
if (_last_gc_live_oops == NULL) { |
|
311 |
tty->print_cr("No compaction information gathered yet"); |
|
312 |
return; |
|
313 |
} |
|
314 |
||
315 |
for (int i = 0; i < _last_gc_live_oops->length(); i++) { |
|
316 |
HeapWord* old_oop = _last_gc_live_oops->at(i); |
|
317 |
size_t sz = _last_gc_live_oops_size->at(i); |
|
318 |
if (old_oop <= q && q < (old_oop + sz)) { |
|
319 |
HeapWord* new_oop = _last_gc_live_oops_moved_to->at(i); |
|
320 |
size_t offset = (q - old_oop); |
|
321 |
tty->print_cr("Address " PTR_FORMAT, q); |
|
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changeset
|
322 |
tty->print_cr(" Was in oop " PTR_FORMAT ", size " SIZE_FORMAT ", at offset " SIZE_FORMAT, old_oop, sz, offset); |
1 | 323 |
tty->print_cr(" Now in oop " PTR_FORMAT ", actual address " PTR_FORMAT, new_oop, new_oop + offset); |
324 |
return; |
|
325 |
} |
|
326 |
} |
|
327 |
||
328 |
tty->print_cr("Address " PTR_FORMAT " not found in live oop information from last GC", q); |
|
329 |
} |
|
330 |
#endif //VALIDATE_MARK_SWEEP |
|
331 |
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|
332 |
MarkSweep::IsAliveClosure MarkSweep::is_alive; |
1 | 333 |
|
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|
334 |
void MarkSweep::IsAliveClosure::do_object(oop p) { ShouldNotReachHere(); } |
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|
335 |
bool MarkSweep::IsAliveClosure::do_object_b(oop p) { return p->is_gc_marked(); } |
1 | 336 |
|
337 |
MarkSweep::KeepAliveClosure MarkSweep::keep_alive; |
|
338 |
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|
339 |
void MarkSweep::KeepAliveClosure::do_oop(oop* p) { MarkSweep::KeepAliveClosure::do_oop_work(p); } |
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|
340 |
void MarkSweep::KeepAliveClosure::do_oop(narrowOop* p) { MarkSweep::KeepAliveClosure::do_oop_work(p); } |
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|
341 |
|
1 | 342 |
void marksweep_init() { /* empty */ } |
343 |
||
344 |
#ifndef PRODUCT |
|
345 |
||
346 |
void MarkSweep::trace(const char* msg) { |
|
347 |
if (TraceMarkSweep) |
|
348 |
gclog_or_tty->print("%s", msg); |
|
349 |
} |
|
350 |
||
351 |
#endif |