Mercurial > hg > truffle
view src/share/vm/gc_implementation/shared/markSweep.hpp @ 13040:f8b56489e455
Merge
author | mgronlun |
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date | Fri, 01 Nov 2013 17:10:31 +0000 |
parents | f2110083203d |
children | 55a0da3d420b |
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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. * */ #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); }; // The one and only place to start following the classes. // Should only be applied to the ClassLoaderData klasses list. class FollowKlassClosure : public KlassClosure { public: void do_klass(Klass* klass); }; class AdjustKlassClosure : public KlassClosure { public: void do_klass(Klass* klass); }; 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 CodeBlobToOopClosure follow_code_root_closure; // => follow_root_closure static MarkAndPushClosure mark_and_push_closure; static FollowKlassClosure follow_klass_closure; static FollowStackClosure follow_stack_closure; static AdjustPointerClosure adjust_pointer_closure; static AdjustKlassClosure adjust_klass_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 adjust_klass(Klass* klass); static void follow_class_loader(ClassLoaderData* cld); static void adjust_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