| /* |
| * 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. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP |
| #define SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP |
| |
| #include "gc_interface/collectedHeap.hpp" |
| #include "memory/universe.hpp" |
| #include "oops/markOop.hpp" |
| #include "oops/oop.hpp" |
| #include "runtime/timer.hpp" |
| #include "utilities/growableArray.hpp" |
| #include "utilities/stack.hpp" |
| #include "utilities/taskqueue.hpp" |
| |
| class ReferenceProcessor; |
| class DataLayout; |
| class SerialOldTracer; |
| class STWGCTimer; |
| |
| // MarkSweep takes care of global mark-compact garbage collection for a |
| // GenCollectedHeap using a four-phase pointer forwarding algorithm. All |
| // generations are assumed to support marking; those that can also support |
| // compaction. |
| // |
| // Class unloading will only occur when a full gc is invoked. |
| |
| // declared at end |
| class PreservedMark; |
| |
| class MarkSweep : AllStatic { |
| // |
| // Inline closure decls |
| // |
| class FollowRootClosure: public OopsInGenClosure { |
| public: |
| virtual void do_oop(oop* p); |
| virtual void do_oop(narrowOop* p); |
| }; |
| |
| class MarkAndPushClosure: public OopClosure { |
| public: |
| virtual void do_oop(oop* p); |
| virtual void do_oop(narrowOop* p); |
| }; |
| |
| class FollowStackClosure: public VoidClosure { |
| public: |
| virtual void do_void(); |
| }; |
| |
| class AdjustPointerClosure: public OopsInGenClosure { |
| public: |
| virtual void do_oop(oop* p); |
| virtual void do_oop(narrowOop* p); |
| }; |
| |
| // Used for java/lang/ref handling |
| class IsAliveClosure: public BoolObjectClosure { |
| public: |
| virtual bool do_object_b(oop p); |
| }; |
| |
| class KeepAliveClosure: public OopClosure { |
| protected: |
| template <class T> void do_oop_work(T* p); |
| public: |
| virtual void do_oop(oop* p); |
| virtual void do_oop(narrowOop* p); |
| }; |
| |
| // |
| // Friend decls |
| // |
| friend class AdjustPointerClosure; |
| friend class KeepAliveClosure; |
| friend class VM_MarkSweep; |
| friend void marksweep_init(); |
| |
| // |
| // Vars |
| // |
| protected: |
| // Total invocations of a MarkSweep collection |
| static uint _total_invocations; |
| |
| // Traversal stacks used during phase1 |
| static Stack<oop, mtGC> _marking_stack; |
| static Stack<ObjArrayTask, mtGC> _objarray_stack; |
| |
| // Space for storing/restoring mark word |
| static Stack<markOop, mtGC> _preserved_mark_stack; |
| static Stack<oop, mtGC> _preserved_oop_stack; |
| static size_t _preserved_count; |
| static size_t _preserved_count_max; |
| static PreservedMark* _preserved_marks; |
| |
| // Reference processing (used in ...follow_contents) |
| static ReferenceProcessor* _ref_processor; |
| |
| static STWGCTimer* _gc_timer; |
| static SerialOldTracer* _gc_tracer; |
| |
| // Non public closures |
| static KeepAliveClosure keep_alive; |
| |
| // Debugging |
| static void trace(const char* msg) PRODUCT_RETURN; |
| |
| public: |
| // Public closures |
| static IsAliveClosure is_alive; |
| static FollowRootClosure follow_root_closure; |
| static MarkAndPushClosure mark_and_push_closure; |
| static FollowStackClosure follow_stack_closure; |
| static CLDToOopClosure follow_cld_closure; |
| static AdjustPointerClosure adjust_pointer_closure; |
| static CLDToOopClosure adjust_cld_closure; |
| |
| // Accessors |
| static uint total_invocations() { return _total_invocations; } |
| |
| // Reference Processing |
| static ReferenceProcessor* const ref_processor() { return _ref_processor; } |
| |
| static STWGCTimer* gc_timer() { return _gc_timer; } |
| static SerialOldTracer* gc_tracer() { return _gc_tracer; } |
| |
| // Call backs for marking |
| static void mark_object(oop obj); |
| // Mark pointer and follow contents. Empty marking stack afterwards. |
| template <class T> static inline void follow_root(T* p); |
| |
| // Check mark and maybe push on marking stack |
| template <class T> static void mark_and_push(T* p); |
| |
| static inline void push_objarray(oop obj, size_t index); |
| |
| static void follow_stack(); // Empty marking stack. |
| |
| static void follow_klass(Klass* klass); |
| |
| static void follow_class_loader(ClassLoaderData* cld); |
| |
| static void preserve_mark(oop p, markOop mark); |
| // Save the mark word so it can be restored later |
| static void adjust_marks(); // Adjust the pointers in the preserved marks table |
| static void restore_marks(); // Restore the marks that we saved in preserve_mark |
| |
| template <class T> static inline void adjust_pointer(T* p); |
| }; |
| |
| class PreservedMark VALUE_OBJ_CLASS_SPEC { |
| private: |
| oop _obj; |
| markOop _mark; |
| |
| public: |
| void init(oop obj, markOop mark) { |
| _obj = obj; |
| _mark = mark; |
| } |
| |
| void adjust_pointer() { |
| MarkSweep::adjust_pointer(&_obj); |
| } |
| |
| void restore() { |
| _obj->set_mark(_mark); |
| } |
| }; |
| |
| #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP |