comparison src/share/vm/oops/markOop.hpp @ 3602:da91efe96a93

6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 1d1603768966
children 22b8d3d181d9
comparison
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12:dc0cbe22a968 13:2dee743bcba7
1 /* 1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
259 inline bool must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const; 259 inline bool must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const;
260 260
261 // Should this header be preserved during a scavenge where CMS is 261 // Should this header be preserved during a scavenge where CMS is
262 // the old generation? 262 // the old generation?
263 // (This is basically the same body as must_be_preserved_for_promotion_failure(), 263 // (This is basically the same body as must_be_preserved_for_promotion_failure(),
264 // but takes the klassOop as argument instead) 264 // but takes the Klass* as argument instead)
265 inline bool must_be_preserved_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const; 265 inline bool must_be_preserved_for_cms_scavenge(Klass* klass_of_obj_containing_mark) const;
266 inline bool must_be_preserved_with_bias_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const; 266 inline bool must_be_preserved_with_bias_for_cms_scavenge(Klass* klass_of_obj_containing_mark) const;
267 267
268 // WARNING: The following routines are used EXCLUSIVELY by 268 // WARNING: The following routines are used EXCLUSIVELY by
269 // synchronization functions. They are not really gc safe. 269 // synchronization functions. They are not really gc safe.
270 // They must get updated if markOop layout get changed. 270 // They must get updated if markOop layout get changed.
271 markOop set_unlocked() const { 271 markOop set_unlocked() const {
329 // used to encode pointers during GC 329 // used to encode pointers during GC
330 markOop clear_lock_bits() { return markOop(value() & ~lock_mask_in_place); } 330 markOop clear_lock_bits() { return markOop(value() & ~lock_mask_in_place); }
331 331
332 // age operations 332 // age operations
333 markOop set_marked() { return markOop((value() & ~lock_mask_in_place) | marked_value); } 333 markOop set_marked() { return markOop((value() & ~lock_mask_in_place) | marked_value); }
334 markOop set_unmarked() { return markOop((value() & ~lock_mask_in_place) | unlocked_value); }
334 335
335 int age() const { return mask_bits(value() >> age_shift, age_mask); } 336 int age() const { return mask_bits(value() >> age_shift, age_mask); }
336 markOop set_age(int v) const { 337 markOop set_age(int v) const {
337 assert((v & ~age_mask) == 0, "shouldn't overflow age field"); 338 assert((v & ~age_mask) == 0, "shouldn't overflow age field");
338 return markOop((value() & ~age_mask_in_place) | (((intptr_t)v & age_mask) << age_shift)); 339 return markOop((value() & ~age_mask_in_place) | (((intptr_t)v & age_mask) << age_shift));
362 // Prepare address of oop for placement into mark 363 // Prepare address of oop for placement into mark
363 inline static markOop encode_pointer_as_mark(void* p) { return markOop(p)->set_marked(); } 364 inline static markOop encode_pointer_as_mark(void* p) { return markOop(p)->set_marked(); }
364 365
365 // Recover address of oop from encoded form used in mark 366 // Recover address of oop from encoded form used in mark
366 inline void* decode_pointer() { if (UseBiasedLocking && has_bias_pattern()) return NULL; return clear_lock_bits(); } 367 inline void* decode_pointer() { if (UseBiasedLocking && has_bias_pattern()) return NULL; return clear_lock_bits(); }
367
368 // see the definition in markOop.cpp for the gory details
369 bool should_not_be_cached() const;
370 368
371 // These markOops indicate cms free chunk blocks and not objects. 369 // These markOops indicate cms free chunk blocks and not objects.
372 // In 64 bit, the markOop is set to distinguish them from oops. 370 // In 64 bit, the markOop is set to distinguish them from oops.
373 // These are defined in 32 bit mode for vmStructs. 371 // These are defined in 32 bit mode for vmStructs.
374 const static uintptr_t cms_free_chunk_pattern = 0x1; 372 const static uintptr_t cms_free_chunk_pattern = 0x1;