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1 /*
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2 * Copyright 1998-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // A compiledICHolderOop is a helper object for the inline cache implementation.
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26 // It holds an intermediate value (method+klass pair) used when converting from
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27 // compiled to an interpreted call.
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28 //
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29 // compiledICHolderOops are always allocated permanent (to avoid traversing the
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30 // codeCache during scavenge).
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31
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32
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33 class compiledICHolderOopDesc : public oopDesc {
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34 friend class VMStructs;
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35 private:
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36 methodOop _holder_method;
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37 klassOop _holder_klass; // to avoid name conflict with oopDesc::_klass
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38 public:
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39 // accessors
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40 methodOop holder_method() const { return _holder_method; }
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41 klassOop holder_klass() const { return _holder_klass; }
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42
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43 void set_holder_method(methodOop m) { oop_store_without_check((oop*)&_holder_method, (oop)m); }
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44 void set_holder_klass(klassOop k) { oop_store_without_check((oop*)&_holder_klass, (oop)k); }
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45
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46 static int header_size() { return sizeof(compiledICHolderOopDesc)/HeapWordSize; }
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47 static int object_size() { return align_object_size(header_size()); }
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48
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49 // interpreter support (offsets in bytes)
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50 static int holder_method_offset() { return offset_of(compiledICHolderOopDesc, _holder_method); }
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51 static int holder_klass_offset() { return offset_of(compiledICHolderOopDesc, _holder_klass); }
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52
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53 // GC support
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54 oop* adr_holder_method() const { return (oop*)&_holder_method; }
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55 oop* adr_holder_klass() const { return (oop*)&_holder_klass; }
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56 };
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