83 lines
3.3 KiB
C++
83 lines
3.3 KiB
C++
/*
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* Copyright (c) 1998, 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_RUNTIME_BASICLOCK_HPP
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#define SHARE_VM_RUNTIME_BASICLOCK_HPP
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#include "oops/markOop.hpp"
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#include "runtime/handles.hpp"
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#include "utilities/top.hpp"
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class BasicLock VALUE_OBJ_CLASS_SPEC {
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friend class VMStructs;
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friend class JVMCIVMStructs;
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private:
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volatile markOop _displaced_header;
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public:
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markOop displaced_header() const { return _displaced_header; }
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void set_displaced_header(markOop header) { _displaced_header = header; }
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void print_on(outputStream* st) const;
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// move a basic lock (used during deoptimization
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void move_to(oop obj, BasicLock* dest);
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static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); }
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};
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// A BasicObjectLock associates a specific Java object with a BasicLock.
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// It is currently embedded in an interpreter frame.
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// Because some machines have alignment restrictions on the control stack,
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// the actual space allocated by the interpreter may include padding words
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// after the end of the BasicObjectLock. Also, in order to guarantee
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// alignment of the embedded BasicLock objects on such machines, we
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// put the embedded BasicLock at the beginning of the struct.
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class BasicObjectLock VALUE_OBJ_CLASS_SPEC {
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friend class VMStructs;
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private:
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BasicLock _lock; // the lock, must be double word aligned
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oop _obj; // object holds the lock;
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public:
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// Manipulation
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oop obj() const { return _obj; }
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void set_obj(oop obj) { _obj = obj; }
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BasicLock* lock() { return &_lock; }
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// Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks
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// in interpreter activation frames since it includes machine-specific padding.
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static int size() { return sizeof(BasicObjectLock)/wordSize; }
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// GC support
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void oops_do(OopClosure* f) { f->do_oop(&_obj); }
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static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); }
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static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); }
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};
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#endif // SHARE_VM_RUNTIME_BASICLOCK_HPP
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