author | twisti |
Mon, 14 Dec 2015 17:02:02 -1000 | |
changeset 35123 | b0b89d83bcf5 |
parent 7397 | 5b173b4ca846 |
child 37466 | 287c4ebd11b0 |
permissions | -rw-r--r-- |
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/* |
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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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35123
b0b89d83bcf5
8134994: use separate VMStructs databases for SA and JVMCI
twisti
parents:
7397
diff
changeset
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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 |