src/cpu/sparc/vm/stubRoutines_sparc.cpp

Thu, 07 Apr 2011 09:53:20 -0700

author
johnc
date
Thu, 07 Apr 2011 09:53:20 -0700
changeset 2781
e1162778c1c8
parent 2314
f95d63e2154a
child 4299
f34d701e952e
permissions
-rw-r--r--

7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes

     1 /*
     2  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     4  *
     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
     7  * published by the Free Software Foundation.
     8  *
     9  * This code is distributed in the hope that it will be useful, but WITHOUT
    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    12  * version 2 for more details (a copy is included in the LICENSE file that
    13  * accompanied this code).
    14  *
    15  * You should have received a copy of the GNU General Public License version
    16  * 2 along with this work; if not, write to the Free Software Foundation,
    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    18  *
    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    20  * or visit www.oracle.com if you need additional information or have any
    21  * questions.
    22  *
    23  */
    25 #include "precompiled.hpp"
    26 #include "runtime/deoptimization.hpp"
    27 #include "runtime/frame.inline.hpp"
    28 #include "runtime/stubRoutines.hpp"
    29 #ifdef TARGET_OS_FAMILY_linux
    30 # include "thread_linux.inline.hpp"
    31 #endif
    32 #ifdef TARGET_OS_FAMILY_solaris
    33 # include "thread_solaris.inline.hpp"
    34 #endif
    36 // Implementation of the platform-specific part of StubRoutines - for
    37 // a description of how to extend it, see the stubRoutines.hpp file.
    40 extern "C" {
    41   address _flush_reg_windows();   // in .s file.
    42   // Flush registers to stack. In case of error we will need to stack walk.
    43   address bootstrap_flush_windows(void) {
    44     Thread* thread = ThreadLocalStorage::get_thread_slow();
    45     // Very early in process there is no thread.
    46     if (thread != NULL) {
    47       guarantee(thread->is_Java_thread(), "Not a Java thread.");
    48       JavaThread* jt = (JavaThread*)thread;
    49       guarantee(!jt->has_last_Java_frame(), "Must be able to flush registers!");
    50     }
    51     return (address)_flush_reg_windows();
    52   };
    53 };
    55 address StubRoutines::Sparc::_test_stop_entry = NULL;
    56 address StubRoutines::Sparc::_stop_subroutine_entry = NULL;
    57 address StubRoutines::Sparc::_flush_callers_register_windows_entry = CAST_FROM_FN_PTR(address, bootstrap_flush_windows);
    59 address StubRoutines::Sparc::_partial_subtype_check = NULL;
    61 int StubRoutines::Sparc::_atomic_memory_operation_lock = StubRoutines::Sparc::unlocked;
    63 int StubRoutines::Sparc::_v8_oop_lock_cache[StubRoutines::Sparc::nof_v8_oop_lock_cache_entries];

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