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annotate src/share/vm/ci/ciBaseObject.hpp @ 14518:d8041d695d19

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Merged with jdk9/dev/hotspot changeset 3812c088b945
author twisti
date Tue, 11 Mar 2014 18:45:59 -0700
parents da91efe96a93
children
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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