hotspot/src/share/vm/oops/markOop.hpp
author never
Wed, 30 Mar 2011 07:47:19 -0700
changeset 8878 a6283814032c
parent 8076 96d498ec7ae1
child 8921 14bfe81f2a9d
permissions -rw-r--r--
7031614: jmap -permstat fails with java.lang.InternalError in sun.jvm.hotspot.oops.OopField.getValue Reviewed-by: kvn, dcubed
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/*
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 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_OOPS_MARKOOP_HPP
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#define SHARE_VM_OOPS_MARKOOP_HPP
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#include "oops/oop.hpp"
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// The markOop describes the header of an object.
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//
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// Note that the mark is not a real oop but just a word.
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// It is placed in the oop hierarchy for historical reasons.
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//
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// Bit-format of an object header (most significant first, big endian layout below):
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//
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//  32 bits:
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//  --------
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//             hash:25 ------------>| age:4    biased_lock:1 lock:2 (normal object)
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//             JavaThread*:23 epoch:2 age:4    biased_lock:1 lock:2 (biased object)
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//             size:32 ------------------------------------------>| (CMS free block)
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//             PromotedObject*:29 ---------->| promo_bits:3 ----->| (CMS promoted object)
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//
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//  64 bits:
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//  --------
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//  unused:25 hash:31 -->| unused:1   age:4    biased_lock:1 lock:2 (normal object)
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//  JavaThread*:54 epoch:2 unused:1   age:4    biased_lock:1 lock:2 (biased object)
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//  PromotedObject*:61 --------------------->| promo_bits:3 ----->| (CMS promoted object)
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//  size:64 ----------------------------------------------------->| (CMS free block)
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//
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//  unused:25 hash:31 -->| cms_free:1 age:4    biased_lock:1 lock:2 (COOPs && normal object)
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//  JavaThread*:54 epoch:2 cms_free:1 age:4    biased_lock:1 lock:2 (COOPs && biased object)
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//  narrowOop:32 unused:24 cms_free:1 unused:4 promo_bits:3 ----->| (COOPs && CMS promoted object)
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//  unused:21 size:35 -->| cms_free:1 unused:7 ------------------>| (COOPs && CMS free block)
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//
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//  - hash contains the identity hash value: largest value is
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//    31 bits, see os::random().  Also, 64-bit vm's require
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//    a hash value no bigger than 32 bits because they will not
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//    properly generate a mask larger than that: see library_call.cpp
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//    and c1_CodePatterns_sparc.cpp.
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//
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//  - the biased lock pattern is used to bias a lock toward a given
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//    thread. When this pattern is set in the low three bits, the lock
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//    is either biased toward a given thread or "anonymously" biased,
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//    indicating that it is possible for it to be biased. When the
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//    lock is biased toward a given thread, locking and unlocking can
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//    be performed by that thread without using atomic operations.
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//    When a lock's bias is revoked, it reverts back to the normal
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//    locking scheme described below.
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//
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//    Note that we are overloading the meaning of the "unlocked" state
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//    of the header. Because we steal a bit from the age we can
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//    guarantee that the bias pattern will never be seen for a truly
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//    unlocked object.
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//
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//    Note also that the biased state contains the age bits normally
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//    contained in the object header. Large increases in scavenge
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//    times were seen when these bits were absent and an arbitrary age
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//    assigned to all biased objects, because they tended to consume a
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//    significant fraction of the eden semispaces and were not
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//    promoted promptly, causing an increase in the amount of copying
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//    performed. The runtime system aligns all JavaThread* pointers to
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//    a very large value (currently 128 bytes (32bVM) or 256 bytes (64bVM))
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//    to make room for the age bits & the epoch bits (used in support of
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//    biased locking), and for the CMS "freeness" bit in the 64bVM (+COOPs).
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//
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//    [JavaThread* | epoch | age | 1 | 01]       lock is biased toward given thread
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//    [0           | epoch | age | 1 | 01]       lock is anonymously biased
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//
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//  - the two lock bits are used to describe three states: locked/unlocked and monitor.
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//
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//    [ptr             | 00]  locked             ptr points to real header on stack
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//    [header      | 0 | 01]  unlocked           regular object header
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//    [ptr             | 10]  monitor            inflated lock (header is wapped out)
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//    [ptr             | 11]  marked             used by markSweep to mark an object
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//                                               not valid at any other time
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//
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//    We assume that stack/thread pointers have the lowest two bits cleared.
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class BasicLock;
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class ObjectMonitor;
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class JavaThread;
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class markOopDesc: public oopDesc {
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 private:
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  // Conversion
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  uintptr_t value() const { return (uintptr_t) this; }
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 public:
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  // Constants
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  enum { age_bits                 = 4,
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         lock_bits                = 2,
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         biased_lock_bits         = 1,
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         max_hash_bits            = BitsPerWord - age_bits - lock_bits - biased_lock_bits,
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         hash_bits                = max_hash_bits > 31 ? 31 : max_hash_bits,
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         cms_bits                 = LP64_ONLY(1) NOT_LP64(0),
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         epoch_bits               = 2
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  };
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  // The biased locking code currently requires that the age bits be
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  // contiguous to the lock bits.
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  enum { lock_shift               = 0,
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         biased_lock_shift        = lock_bits,
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         age_shift                = lock_bits + biased_lock_bits,
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         cms_shift                = age_shift + age_bits,
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         hash_shift               = cms_shift + cms_bits,
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         epoch_shift              = hash_shift
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  };
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  enum { lock_mask                = right_n_bits(lock_bits),
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         lock_mask_in_place       = lock_mask << lock_shift,
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         biased_lock_mask         = right_n_bits(lock_bits + biased_lock_bits),
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         biased_lock_mask_in_place= biased_lock_mask << lock_shift,
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         biased_lock_bit_in_place = 1 << biased_lock_shift,
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         age_mask                 = right_n_bits(age_bits),
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         age_mask_in_place        = age_mask << age_shift,
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         epoch_mask               = right_n_bits(epoch_bits),
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         epoch_mask_in_place      = epoch_mask << epoch_shift,
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         cms_mask                 = right_n_bits(cms_bits),
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         cms_mask_in_place        = cms_mask << cms_shift
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#ifndef _WIN64
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         ,hash_mask               = right_n_bits(hash_bits),
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         hash_mask_in_place       = (address_word)hash_mask << hash_shift
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#endif
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  };
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  // Alignment of JavaThread pointers encoded in object header required by biased locking
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  enum { biased_lock_alignment    = 2 << (epoch_shift + epoch_bits)
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  };
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#ifdef _WIN64
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    // These values are too big for Win64
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    const static uintptr_t hash_mask = right_n_bits(hash_bits);
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    const static uintptr_t hash_mask_in_place  =
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                            (address_word)hash_mask << hash_shift;
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#endif
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  enum { locked_value             = 0,
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         unlocked_value           = 1,
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         monitor_value            = 2,
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         marked_value             = 3,
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         biased_lock_pattern      = 5
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  };
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  enum { no_hash                  = 0 };  // no hash value assigned
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  enum { no_hash_in_place         = (address_word)no_hash << hash_shift,
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         no_lock_in_place         = unlocked_value
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  };
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  enum { max_age                  = age_mask };
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  enum { max_bias_epoch           = epoch_mask };
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  // Biased Locking accessors.
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  // These must be checked by all code which calls into the
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  // ObjectSynchronizer and other code. The biasing is not understood
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  // by the lower-level CAS-based locking code, although the runtime
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  // fixes up biased locks to be compatible with it when a bias is
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  // revoked.
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  bool has_bias_pattern() const {
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    return (mask_bits(value(), biased_lock_mask_in_place) == biased_lock_pattern);
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  }
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  JavaThread* biased_locker() const {
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    assert(has_bias_pattern(), "should not call this otherwise");
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    return (JavaThread*) ((intptr_t) (mask_bits(value(), ~(biased_lock_mask_in_place | age_mask_in_place | epoch_mask_in_place))));
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  }
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  // Indicates that the mark has the bias bit set but that it has not
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  // yet been biased toward a particular thread
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  bool is_biased_anonymously() const {
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    return (has_bias_pattern() && (biased_locker() == NULL));
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  }
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  // Indicates epoch in which this bias was acquired. If the epoch
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  // changes due to too many bias revocations occurring, the biases
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  // from the previous epochs are all considered invalid.
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  int bias_epoch() const {
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    assert(has_bias_pattern(), "should not call this otherwise");
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    return (mask_bits(value(), epoch_mask_in_place) >> epoch_shift);
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  }
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  markOop set_bias_epoch(int epoch) {
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    assert(has_bias_pattern(), "should not call this otherwise");
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    assert((epoch & (~epoch_mask)) == 0, "epoch overflow");
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    return markOop(mask_bits(value(), ~epoch_mask_in_place) | (epoch << epoch_shift));
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  }
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  markOop incr_bias_epoch() {
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    return set_bias_epoch((1 + bias_epoch()) & epoch_mask);
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  }
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  // Prototype mark for initialization
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  static markOop biased_locking_prototype() {
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    return markOop( biased_lock_pattern );
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  }
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  // lock accessors (note that these assume lock_shift == 0)
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  bool is_locked()   const {
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    return (mask_bits(value(), lock_mask_in_place) != unlocked_value);
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  }
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  bool is_unlocked() const {
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    return (mask_bits(value(), biased_lock_mask_in_place) == unlocked_value);
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  }
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  bool is_marked()   const {
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    return (mask_bits(value(), lock_mask_in_place) == marked_value);
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  }
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  bool is_neutral()  const { return (mask_bits(value(), biased_lock_mask_in_place) == unlocked_value); }
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  // Special temporary state of the markOop while being inflated.
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  // Code that looks at mark outside a lock need to take this into account.
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  bool is_being_inflated() const { return (value() == 0); }
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  // Distinguished markword value - used when inflating over
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  // an existing stacklock.  0 indicates the markword is "BUSY".
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  // Lockword mutators that use a LD...CAS idiom should always
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  // check for and avoid overwriting a 0 value installed by some
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  // other thread.  (They should spin or block instead.  The 0 value
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  // is transient and *should* be short-lived).
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  static markOop INFLATING() { return (markOop) 0; }    // inflate-in-progress
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  // Should this header be preserved during GC?
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  inline bool must_be_preserved(oop obj_containing_mark) const;
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  inline bool must_be_preserved_with_bias(oop obj_containing_mark) const;
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  // Should this header (including its age bits) be preserved in the
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  // case of a promotion failure during scavenge?
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  // Note that we special case this situation. We want to avoid
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  // calling BiasedLocking::preserve_marks()/restore_marks() (which
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  // decrease the number of mark words that need to be preserved
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  // during GC) during each scavenge. During scavenges in which there
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  // is no promotion failure, we actually don't need to call the above
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  // routines at all, since we don't mutate and re-initialize the
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  // marks of promoted objects using init_mark(). However, during
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  // scavenges which result in promotion failure, we do re-initialize
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  // the mark words of objects, meaning that we should have called
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  // these mark word preservation routines. Currently there's no good
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  // place in which to call them in any of the scavengers (although
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  // guarded by appropriate locks we could make one), but the
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  // observation is that promotion failures are quite rare and
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  // reducing the number of mark words preserved during them isn't a
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  // high priority.
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  inline bool must_be_preserved_for_promotion_failure(oop obj_containing_mark) const;
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  inline bool must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const;
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  // Should this header be preserved during a scavenge where CMS is
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  // the old generation?
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  // (This is basically the same body as must_be_preserved_for_promotion_failure(),
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  // but takes the klassOop as argument instead)
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  inline bool must_be_preserved_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const;
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  inline bool must_be_preserved_with_bias_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const;
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  // WARNING: The following routines are used EXCLUSIVELY by
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  // synchronization functions. They are not really gc safe.
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  // They must get updated if markOop layout get changed.
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  markOop set_unlocked() const {
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    return markOop(value() | unlocked_value);
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  }
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  bool has_locker() const {
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    return ((value() & lock_mask_in_place) == locked_value);
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  }
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  BasicLock* locker() const {
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    assert(has_locker(), "check");
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    return (BasicLock*) value();
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  }
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  bool has_monitor() const {
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    return ((value() & monitor_value) != 0);
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  }
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  ObjectMonitor* monitor() const {
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    assert(has_monitor(), "check");
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    // Use xor instead of &~ to provide one extra tag-bit check.
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    return (ObjectMonitor*) (value() ^ monitor_value);
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  }
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  bool has_displaced_mark_helper() const {
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    return ((value() & unlocked_value) == 0);
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  }
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  markOop displaced_mark_helper() const {
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    assert(has_displaced_mark_helper(), "check");
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    intptr_t ptr = (value() & ~monitor_value);
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    return *(markOop*)ptr;
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  }
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  void set_displaced_mark_helper(markOop m) const {
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    assert(has_displaced_mark_helper(), "check");
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    intptr_t ptr = (value() & ~monitor_value);
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    *(markOop*)ptr = m;
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  }
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  markOop copy_set_hash(intptr_t hash) const {
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    intptr_t tmp = value() & (~hash_mask_in_place);
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    tmp |= ((hash & hash_mask) << hash_shift);
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    return (markOop)tmp;
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  }
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  // it is only used to be stored into BasicLock as the
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  // indicator that the lock is using heavyweight monitor
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  static markOop unused_mark() {
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    return (markOop) marked_value;
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  }
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  // the following two functions create the markOop to be
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  // stored into object header, it encodes monitor info
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  static markOop encode(BasicLock* lock) {
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    return (markOop) lock;
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  }
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  static markOop encode(ObjectMonitor* monitor) {
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    intptr_t tmp = (intptr_t) monitor;
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    return (markOop) (tmp | monitor_value);
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  }
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  static markOop encode(JavaThread* thread, int age, int bias_epoch) {
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    intptr_t tmp = (intptr_t) thread;
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    assert(UseBiasedLocking && ((tmp & (epoch_mask_in_place | age_mask_in_place | biased_lock_mask_in_place)) == 0), "misaligned JavaThread pointer");
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    assert(age <= max_age, "age too large");
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    assert(bias_epoch <= max_bias_epoch, "bias epoch too large");
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    return (markOop) (tmp | (bias_epoch << epoch_shift) | (age << age_shift) | biased_lock_pattern);
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  }
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  // used to encode pointers during GC
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  markOop clear_lock_bits() { return markOop(value() & ~lock_mask_in_place); }
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  // age operations
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  markOop set_marked()   { return markOop((value() & ~lock_mask_in_place) | marked_value); }
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  int     age()               const { return mask_bits(value() >> age_shift, age_mask); }
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  markOop set_age(int v) const {
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    assert((v & ~age_mask) == 0, "shouldn't overflow age field");
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    return markOop((value() & ~age_mask_in_place) | (((intptr_t)v & age_mask) << age_shift));
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  }
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  markOop incr_age()          const { return age() == max_age ? markOop(this) : set_age(age() + 1); }
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  // hash operations
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  intptr_t hash() const {
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    return mask_bits(value() >> hash_shift, hash_mask);
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  }
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  bool has_no_hash() const {
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    return hash() == no_hash;
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  }
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  // Prototype mark for initialization
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  static markOop prototype() {
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    return markOop( no_hash_in_place | no_lock_in_place );
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  }
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  // Helper function for restoration of unmarked mark oops during GC
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  static inline markOop prototype_for_object(oop obj);
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  // Debugging
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  void print_on(outputStream* st) const;
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  // Prepare address of oop for placement into mark
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  inline static markOop encode_pointer_as_mark(void* p) { return markOop(p)->set_marked(); }
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  // Recover address of oop from encoded form used in mark
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  inline void* decode_pointer() { if (UseBiasedLocking && has_bias_pattern()) return NULL; return clear_lock_bits(); }
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  // see the definition in markOop.cpp for the gory details
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  bool should_not_be_cached() const;
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  // These markOops indicate cms free chunk blocks and not objects.
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  // In 64 bit, the markOop is set to distinguish them from oops.
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  // These are defined in 32 bit mode for vmStructs.
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  const static uintptr_t cms_free_chunk_pattern  = 0x1;
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  // Constants for the size field.
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  enum { size_shift                = cms_shift + cms_bits,
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         size_bits                 = 35    // need for compressed oops 32G
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       };
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  // These values are too big for Win64
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  const static uintptr_t size_mask = LP64_ONLY(right_n_bits(size_bits))
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                                     NOT_LP64(0);
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  const static uintptr_t size_mask_in_place =
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                                     (address_word)size_mask << size_shift;
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#ifdef _LP64
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  static markOop cms_free_prototype() {
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    return markOop(((intptr_t)prototype() & ~cms_mask_in_place) |
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                   ((cms_free_chunk_pattern & cms_mask) << cms_shift));
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  }
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  uintptr_t cms_encoding() const {
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    return mask_bits(value() >> cms_shift, cms_mask);
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  }
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  bool is_cms_free_chunk() const {
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    return is_neutral() &&
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           (cms_encoding() & cms_free_chunk_pattern) == cms_free_chunk_pattern;
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  }
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  size_t get_size() const       { return (size_t)(value() >> size_shift); }
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  static markOop set_size_and_free(size_t size) {
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    assert((size & ~size_mask) == 0, "shouldn't overflow size field");
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    return markOop(((intptr_t)cms_free_prototype() & ~size_mask_in_place) |
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                   (((intptr_t)size & size_mask) << size_shift));
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  }
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#endif // _LP64
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};
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#endif // SHARE_VM_OOPS_MARKOOP_HPP