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annotate src/share/vm/ci/ciBaseObject.hpp @ 14702:d4dd5204c0aa
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author | ehelin |
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date | Fri, 14 Mar 2014 13:27:18 +0100 |
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1 /* |
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2 * Copyright (c) 2011, 2012, 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 #ifndef SHARE_VM_CI_CIBASEOBJECT_HPP |
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26 #define SHARE_VM_CI_CIBASEOBJECT_HPP |
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27 |
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28 #include "ci/ciClassList.hpp" |
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29 #include "memory/allocation.hpp" |
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30 #include "runtime/handles.hpp" |
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31 #include "runtime/jniHandles.hpp" |
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32 |
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33 // ciBaseObject |
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34 // |
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35 // This class represents an oop in the HotSpot virtual machine. |
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36 // Its subclasses are structured in a hierarchy which mirrors |
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37 // an aggregate of the VM's oop and klass hierarchies (see |
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38 // oopHierarchy.hpp). Each instance of ciBaseObject holds a handle |
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39 // to a corresponding oop on the VM side and provides routines |
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40 // for accessing the information in its oop. By using the ciBaseObject |
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41 // hierarchy for accessing oops in the VM, the compiler ensures |
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42 // that it is safe with respect to garbage collection; that is, |
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43 // GC and compilation can proceed independently without |
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44 // interference. |
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45 // |
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46 // Within the VM, the oop and klass hierarchies are separate. |
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47 // The compiler interface does not preserve this separation -- |
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48 // the distinction between `Klass*' and `Klass' are not |
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49 // reflected in the interface and instead the Klass hierarchy |
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50 // is directly modeled as the subclasses of ciKlass. |
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51 class ciBaseObject : public ResourceObj { |
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52 CI_PACKAGE_ACCESS |
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53 friend class ciEnv; |
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54 |
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55 protected: |
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56 uint _ident; |
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57 |
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58 enum { FLAG_BITS = 1 }; |
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59 enum { |
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60 SCAVENGABLE_FLAG = 1 |
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61 }; |
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62 protected: |
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63 ciBaseObject(): _ident(0) {} |
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64 |
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65 virtual const char* type_string() { return "ciBaseObject"; } |
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66 |
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67 void set_ident(uint id); |
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68 |
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69 public: |
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70 // A number unique to this object. |
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71 uint ident(); |
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72 |
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73 // What kind of ciBaseObject is this? |
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74 virtual bool is_symbol() const { return false; } |
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75 virtual bool is_object() const { return false; } |
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76 virtual bool is_metadata() const { return false; } |
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77 |
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78 ciSymbol* as_symbol() { |
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79 assert(is_symbol(), "must be"); |
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80 return (ciSymbol*)this; |
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81 } |
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82 ciObject* as_object() { |
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83 assert(is_object(), "must be"); |
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84 return (ciObject*)this; |
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85 } |
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86 ciMetadata* as_metadata() { |
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87 assert(is_metadata(), "must be"); |
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88 return (ciMetadata*)this; |
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89 } |
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90 }; |
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91 #endif // SHARE_VM_CI_CIBASEOBJECT_HPP |