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/*
* Copyright (c) 1997, 2013, 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"
uint 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_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* 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_pointer_closure;
void MarkSweep::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p); }
void MarkSweep::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p); }
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;
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
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