Mercurial > hg > graal-compiler
diff src/share/vm/memory/genOopClosures.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | ba764ed4b6f2 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/memory/genOopClosures.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,149 @@ +/* + * 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; +};