1878
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1 /*
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2 * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 class BasicLock VALUE_OBJ_CLASS_SPEC {
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26 friend class VMStructs;
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27 private:
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28 volatile markOop _displaced_header;
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29 public:
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30 markOop displaced_header() const { return _displaced_header; }
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31 void set_displaced_header(markOop header) { _displaced_header = header; }
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32
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33 void print_on(outputStream* st) const;
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34
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35 // move a basic lock (used during deoptimization
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36 void move_to(oop obj, BasicLock* dest);
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37
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38 static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); }
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39 };
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40
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41 // A BasicObjectLock associates a specific Java object with a BasicLock.
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42 // It is currently embedded in an interpreter frame.
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43
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44 // Because some machines have alignment restrictions on the control stack,
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45 // the actual space allocated by the interpreter may include padding words
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46 // after the end of the BasicObjectLock. Also, in order to guarantee
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47 // alignment of the embedded BasicLock objects on such machines, we
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48 // put the embedded BasicLock at the beginning of the struct.
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49
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50 class BasicObjectLock VALUE_OBJ_CLASS_SPEC {
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51 friend class VMStructs;
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52 private:
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53 BasicLock _lock; // the lock, must be double word aligned
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54 oop _obj; // object holds the lock;
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55
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56 public:
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57 // Manipulation
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58 oop obj() const { return _obj; }
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59 void set_obj(oop obj) { _obj = obj; }
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60 BasicLock* lock() { return &_lock; }
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61
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62 // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks
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63 // in interpreter activation frames since it includes machine-specific padding.
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64 static int size() { return sizeof(BasicObjectLock)/wordSize; }
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65
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66 // GC support
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67 void oops_do(OopClosure* f) { f->do_oop(&_obj); }
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68
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69 static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); }
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70 static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); }
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71 };
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72
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