Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "compiler/compileBroker.hpp"

 #include "gc_implementation/shared/markSweep.inline.hpp"

 #include "gc_interface/collectedHeap.inline.hpp"

 #include "oops/methodData.hpp"

 #include "oops/objArrayKlass.inline.hpp"

 #include "oops/oop.inline.hpp"

 unsigned int            MarkSweep::_total_invocations = 0;

 Stack<oop, mtGC>              MarkSweep::_marking_stack;

 Stack<ObjArrayTask, mtGC>     MarkSweep::_objarray_stack;

 Stack<oop, mtGC>              MarkSweep::_preserved_oop_stack;

 Stack<markOop, mtGC>          MarkSweep::_preserved_mark_stack;

 size_t                  MarkSweep::_preserved_count = 0;

 size_t                  MarkSweep::_preserved_count_max = 0;

 PreservedMark*          MarkSweep::_preserved_marks = NULL;

 ReferenceProcessor*     MarkSweep::_ref_processor   = NULL;

 MarkSweep::FollowRootClosure  MarkSweep::follow_root_closure;

 CodeBlobToOopClosure MarkSweep::follow_code_root_closure(&MarkSweep::follow_root_closure, /*do_marking=*/ true);

 void MarkSweep::FollowRootClosure::do_oop(oop* p)       { follow_root(p); }

 void MarkSweep::FollowRootClosure::do_oop(narrowOop* p) { follow_root(p); }

 MarkSweep::MarkAndPushClosure MarkSweep::mark_and_push_closure;

 MarkSweep::FollowKlassClosure MarkSweep::follow_klass_closure;

 MarkSweep::AdjustKlassClosure MarkSweep::adjust_klass_closure;

 void MarkSweep::MarkAndPushClosure::do_oop(oop* p)       { mark_and_push(p); }

 void MarkSweep::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(p); }

 void MarkSweep::FollowKlassClosure::do_klass(Klass* klass) {

   klass->oops_do(&MarkSweep::mark_and_push_closure);

 }

 void MarkSweep::AdjustKlassClosure::do_klass(Klass* klass) {

   klass->oops_do(&MarkSweep::adjust_pointer_closure);

 }

 void MarkSweep::follow_klass(Klass* klass) {

   ClassLoaderData* cld = klass->class_loader_data();

   // The actual processing of the klass is done when we

   // traverse the list of Klasses in the class loader data.

   MarkSweep::follow_class_loader(cld);

 }

 void MarkSweep::adjust_klass(Klass* klass) {

   ClassLoaderData* cld = klass->class_loader_data();

   // The actual processing of the klass is done when we

   // traverse the list of Klasses in the class loader data.

   MarkSweep::adjust_class_loader(cld);

 }

 void MarkSweep::follow_class_loader(ClassLoaderData* cld) {

   cld->oops_do(&MarkSweep::mark_and_push_closure, &MarkSweep::follow_klass_closure, true);

 }

 void MarkSweep::adjust_class_loader(ClassLoaderData* cld) {

   cld->oops_do(&MarkSweep::adjust_root_pointer_closure, &MarkSweep::adjust_klass_closure, true);

 }

 void MarkSweep::follow_stack() {

   do {

     while (!_marking_stack.is_empty()) {

       oop obj = _marking_stack.pop();

       assert (obj->is_gc_marked(), "p must be marked");

       obj->follow_contents();

     }

     // Process ObjArrays one at a time to avoid marking stack bloat.

     if (!_objarray_stack.is_empty()) {

       ObjArrayTask task = _objarray_stack.pop();

       ObjArrayKlass* const k = (ObjArrayKlass*)task.obj()->klass();

       k->oop_follow_contents(task.obj(), task.index());

     }

   } while (!_marking_stack.is_empty() || !_objarray_stack.is_empty());

 }

 MarkSweep::FollowStackClosure MarkSweep::follow_stack_closure;

 void MarkSweep::FollowStackClosure::do_void() { follow_stack(); }

 // We preserve the mark which should be replaced at the end and the location

 // that it will go.  Note that the object that this markOop belongs to isn't

 // currently at that address but it will be after phase4

 void MarkSweep::preserve_mark(oop obj, markOop mark) {

   // We try to store preserved marks in the to space of the new generation since

   // this is storage which should be available.  Most of the time this should be

   // sufficient space for the marks we need to preserve but if it isn't we fall

   // back to using Stacks to keep track of the overflow.

   if (_preserved_count < _preserved_count_max) {

     _preserved_marks[_preserved_count++].init(obj, mark);

   } else {

     _preserved_mark_stack.push(mark);

     _preserved_oop_stack.push(obj);

   }

 }

 MarkSweep::AdjustPointerClosure MarkSweep::adjust_root_pointer_closure(true);

 MarkSweep::AdjustPointerClosure MarkSweep::adjust_pointer_closure(false);

 void MarkSweep::AdjustPointerClosure::do_oop(oop* p)       { adjust_pointer(p, _is_root); }

 void MarkSweep::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p, _is_root); }

 void MarkSweep::adjust_marks() {

   assert( _preserved_oop_stack.size() == _preserved_mark_stack.size(),

          "inconsistent preserved oop stacks");

   // adjust the oops we saved earlier

   for (size_t i = 0; i < _preserved_count; i++) {

     _preserved_marks[i].adjust_pointer();

   }

   // deal with the overflow stack

   StackIterator<oop, mtGC> iter(_preserved_oop_stack);

   while (!iter.is_empty()) {

     oop* p = iter.next_addr();

     adjust_pointer(p);

   }

 }

 void MarkSweep::restore_marks() {

   assert(_preserved_oop_stack.size() == _preserved_mark_stack.size(),

          "inconsistent preserved oop stacks");

   if (PrintGC && Verbose) {

     gclog_or_tty->print_cr("Restoring %d marks",

                            _preserved_count + _preserved_oop_stack.size());

   }

   // restore the marks we saved earlier

   for (size_t i = 0; i < _preserved_count; i++) {

     _preserved_marks[i].restore();

   }

   // deal with the overflow

   while (!_preserved_oop_stack.is_empty()) {

     oop obj       = _preserved_oop_stack.pop();

     markOop mark  = _preserved_mark_stack.pop();

     obj->set_mark(mark);

   }

 }

 MarkSweep::IsAliveClosure   MarkSweep::is_alive;

 void MarkSweep::IsAliveClosure::do_object(oop p)   { ShouldNotReachHere(); }

 bool MarkSweep::IsAliveClosure::do_object_b(oop p) { return p->is_gc_marked(); }

 MarkSweep::KeepAliveClosure MarkSweep::keep_alive;

 void MarkSweep::KeepAliveClosure::do_oop(oop* p)       { MarkSweep::KeepAliveClosure::do_oop_work(p); }

 void MarkSweep::KeepAliveClosure::do_oop(narrowOop* p) { MarkSweep::KeepAliveClosure::do_oop_work(p); }

 void marksweep_init() { /* empty */ }

 #ifndef PRODUCT

 void MarkSweep::trace(const char* msg) {

   if (TraceMarkSweep)

     gclog_or_tty->print("%s", msg);

 }

 #endif