Mercurial > hg > truffle
view src/share/vm/opto/adlcVMDeps.hpp @ 3249:e1162778c1c8
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
| author | johnc |
|---|---|
| date | Thu, 07 Apr 2011 09:53:20 -0700 |
| parents | f95d63e2154a |
| children |
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/* * Copyright (c) 1998, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_OPTO_ADLCVMDEPS_HPP #define SHARE_VM_OPTO_ADLCVMDEPS_HPP // adlcVMDeps.hpp is used by both adlc and vm builds. // Only include allocation.hpp when we're not building adlc. #ifndef SHARE_VM_ADLC_ARENA_HPP #include "memory/allocation.hpp" #endif // Declare commonly known constant and data structures between the // ADLC and the VM // class AdlcVMDeps : public AllStatic { public: // Mirror of TypeFunc types enum { Control, I_O, Memory, FramePtr, ReturnAdr, Parms }; enum Cisc_Status { Not_cisc_spillable = -1 }; // Mirror of OptoReg::Name names enum Name { Physical = 0 // Start of physical regs }; // relocInfo static const char* oop_reloc_type() { return "relocInfo::oop_type"; } static const char* none_reloc_type() { return "relocInfo::none"; } }; #endif // SHARE_VM_OPTO_ADLCVMDEPS_HPP