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1878
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1 /*
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1972
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2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
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1878
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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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1972
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25 #ifndef SHARE_VM_RUNTIME_BASICLOCK_HPP
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26 #define SHARE_VM_RUNTIME_BASICLOCK_HPP
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27
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28 #include "oops/markOop.hpp"
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29 #include "runtime/handles.hpp"
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30 #include "utilities/top.hpp"
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31
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1878
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32 class BasicLock VALUE_OBJ_CLASS_SPEC {
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33 friend class VMStructs;
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34 private:
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35 volatile markOop _displaced_header;
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36 public:
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37 markOop displaced_header() const { return _displaced_header; }
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38 void set_displaced_header(markOop header) { _displaced_header = header; }
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39
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40 void print_on(outputStream* st) const;
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41
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42 // move a basic lock (used during deoptimization
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43 void move_to(oop obj, BasicLock* dest);
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44
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45 static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); }
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46 };
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47
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48 // A BasicObjectLock associates a specific Java object with a BasicLock.
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49 // It is currently embedded in an interpreter frame.
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50
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51 // Because some machines have alignment restrictions on the control stack,
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52 // the actual space allocated by the interpreter may include padding words
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53 // after the end of the BasicObjectLock. Also, in order to guarantee
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54 // alignment of the embedded BasicLock objects on such machines, we
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55 // put the embedded BasicLock at the beginning of the struct.
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56
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57 class BasicObjectLock VALUE_OBJ_CLASS_SPEC {
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58 friend class VMStructs;
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59 private:
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60 BasicLock _lock; // the lock, must be double word aligned
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61 oop _obj; // object holds the lock;
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62
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63 public:
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64 // Manipulation
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65 oop obj() const { return _obj; }
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66 void set_obj(oop obj) { _obj = obj; }
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67 BasicLock* lock() { return &_lock; }
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68
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69 // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks
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70 // in interpreter activation frames since it includes machine-specific padding.
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71 static int size() { return sizeof(BasicObjectLock)/wordSize; }
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72
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73 // GC support
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74 void oops_do(OopClosure* f) { f->do_oop(&_obj); }
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75
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76 static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); }
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77 static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); }
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78 };
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79
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1972
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80
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81 #endif // SHARE_VM_RUNTIME_BASICLOCK_HPP
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