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annotate src/share/vm/ci/ciBaseObject.hpp @ 6972:bd7a7ce2e264

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6830717: replay of compilations would help with debugging Summary: When java process crashed in compiler thread, repeat the compilation process will help finding root cause. This is done with using SA dump application class data and replay data from core dump, then use debug version of jvm to recompile the problematic java method. Reviewed-by: kvn, twisti, sspitsyn Contributed-by: yumin.qi@oracle.com
author minqi
date Mon, 12 Nov 2012 14:03:53 -0800
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