Mercurial > hg > graal-jvmci-8
view src/cpu/zero/vm/entry_zero.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 |
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date | Thu, 07 Apr 2011 09:53:20 -0700 |
parents | f95d63e2154a |
children | da91efe96a93 |
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/* * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2008, 2009, 2010 Red Hat, Inc. * 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 CPU_ZERO_VM_ENTRY_ZERO_HPP #define CPU_ZERO_VM_ENTRY_ZERO_HPP class ZeroEntry { public: ZeroEntry() { ShouldNotCallThis(); } private: address _entry_point; public: address entry_point() const { return _entry_point; } void set_entry_point(address entry_point) { _entry_point = entry_point; } private: typedef int (*NormalEntryFunc)(methodOop method, intptr_t base_pc, TRAPS); typedef int (*OSREntryFunc)(methodOop method, address osr_buf, intptr_t base_pc, TRAPS); public: void invoke(methodOop method, TRAPS) const { maybe_deoptimize( ((NormalEntryFunc) entry_point())(method, (intptr_t) this, THREAD), THREAD); } void invoke_osr(methodOop method, address osr_buf, TRAPS) const { maybe_deoptimize( ((OSREntryFunc) entry_point())(method, osr_buf, (intptr_t) this, THREAD), THREAD); } private: static void maybe_deoptimize(int deoptimized_frames, TRAPS) { if (deoptimized_frames) CppInterpreter::main_loop(deoptimized_frames - 1, THREAD); } public: static ByteSize entry_point_offset() { return byte_offset_of(ZeroEntry, _entry_point); } }; #endif // CPU_ZERO_VM_ENTRY_ZERO_HPP