Mercurial > hg > graal-jvmci-8
view src/share/vm/memory/genOopClosures.hpp @ 139:c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
Reviewed-by: ysr, jmasa
author | apetrusenko |
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date | Tue, 01 Apr 2008 15:13:47 +0400 |
parents | a61af66fc99e |
children | ba764ed4b6f2 |
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/* * Copyright 2001-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ class Generation; class HeapWord; class CardTableRS; class CardTableModRefBS; class DefNewGeneration; // Closure for iterating roots from a particular generation // Note: all classes deriving from this MUST call this do_barrier // method at the end of their own do_oop method! // Note: no do_oop defined, this is an abstract class. class OopsInGenClosure : public OopClosure { private: Generation* _orig_gen; // generation originally set in ctor Generation* _gen; // generation being scanned protected: // Some subtypes need access. HeapWord* _gen_boundary; // start of generation CardTableRS* _rs; // remembered set // For assertions Generation* generation() { return _gen; } CardTableRS* rs() { return _rs; } // Derived classes that modify oops so that they might be old-to-young // pointers must call the method below. void do_barrier(oop* p); public: OopsInGenClosure() : OopClosure(NULL), _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {}; OopsInGenClosure(Generation* gen); void set_generation(Generation* gen); void reset_generation() { _gen = _orig_gen; } // Problem with static closures: must have _gen_boundary set at some point, // but cannot do this until after the heap is initialized. void set_orig_generation(Generation* gen) { _orig_gen = gen; set_generation(gen); } HeapWord* gen_boundary() { return _gen_boundary; } }; // Closure for scanning DefNewGeneration. // // This closure will perform barrier store calls for ALL // pointers in scanned oops. class ScanClosure: public OopsInGenClosure { protected: DefNewGeneration* _g; HeapWord* _boundary; bool _gc_barrier; public: ScanClosure(DefNewGeneration* g, bool gc_barrier); void do_oop(oop* p); void do_oop_nv(oop* p); bool do_header() { return false; } Prefetch::style prefetch_style() { return Prefetch::do_write; } }; // Closure for scanning DefNewGeneration. // // This closure only performs barrier store calls on // pointers into the DefNewGeneration. This is less // precise, but faster, than a ScanClosure class FastScanClosure: public OopsInGenClosure { protected: DefNewGeneration* _g; HeapWord* _boundary; bool _gc_barrier; public: FastScanClosure(DefNewGeneration* g, bool gc_barrier); void do_oop(oop* p); void do_oop_nv(oop* p); bool do_header() { return false; } Prefetch::style prefetch_style() { return Prefetch::do_write; } }; class FilteringClosure: public OopClosure { HeapWord* _boundary; OopClosure* _cl; public: FilteringClosure(HeapWord* boundary, OopClosure* cl) : OopClosure(cl->_ref_processor), _boundary(boundary), _cl(cl) {} void do_oop(oop* p); void do_oop_nv(oop* p) { oop obj = *p; if ((HeapWord*)obj < _boundary && obj != NULL) { _cl->do_oop(p); } } bool do_header() { return false; } }; // Closure for scanning DefNewGeneration's weak references. // NOTE: very much like ScanClosure but not derived from // OopsInGenClosure -- weak references are processed all // at once, with no notion of which generation they were in. class ScanWeakRefClosure: public OopClosure { protected: DefNewGeneration* _g; HeapWord* _boundary; public: ScanWeakRefClosure(DefNewGeneration* g); void do_oop(oop* p); void do_oop_nv(oop* p); }; class VerifyOopClosure: public OopClosure { public: void do_oop(oop* p) { guarantee((*p)->is_oop_or_null(), "invalid oop"); } static VerifyOopClosure verify_oop; };