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annotate src/share/vm/oops/compiledICHolder.hpp @ 12355:cefad50507d8

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Merge with hs25-b53
author Gilles Duboscq <duboscq@ssw.jku.at>
date Fri, 11 Oct 2013 10:38:03 +0200
parents da91efe96a93
children
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1 /*
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2 * Copyright (c) 1998, 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_OOPS_COMPILEDICHOLDEROOP_HPP
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26 #define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP
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27
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28 #include "oops/oop.hpp"
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29
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30 // A CompiledICHolder* is a helper object for the inline cache implementation.
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31 // It holds an intermediate value (method+klass pair) used when converting from
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32 // compiled to an interpreted call.
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33 //
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34 // These are always allocated in the C heap and are freed during a
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35 // safepoint by the ICBuffer logic. It's unsafe to free them earlier
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36 // since they might be in use.
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37 //
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38
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39
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40 class CompiledICHolder : public CHeapObj<mtCompiler> {
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41 friend class VMStructs;
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42 private:
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43 static volatile int _live_count; // allocated
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44 static volatile int _live_not_claimed_count; // allocated but not yet in use so not
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45 // reachable by iterating over nmethods
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46
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47 Method* _holder_method;
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48 Klass* _holder_klass; // to avoid name conflict with oopDesc::_klass
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49 CompiledICHolder* _next;
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50
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51 public:
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52 // Constructor
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53 CompiledICHolder(Method* method, Klass* klass)
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54 : _holder_method(method), _holder_klass(klass) {
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55 #ifdef ASSERT
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56 Atomic::inc(&_live_count);
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57 Atomic::inc(&_live_not_claimed_count);
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58 #endif
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59 }
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60
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61 ~CompiledICHolder() {
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62 #ifdef ASSERT
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63 assert(_live_count > 0, "underflow");
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64 Atomic::dec(&_live_count);
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65 #endif
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66 }
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67
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68 static int live_count() { return _live_count; }
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69 static int live_not_claimed_count() { return _live_not_claimed_count; }
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70
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71 // accessors
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72 Method* holder_method() const { return _holder_method; }
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73 Klass* holder_klass() const { return _holder_klass; }
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74
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75 void set_holder_method(Method* m) { _holder_method = m; }
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76 void set_holder_klass(Klass* k) { _holder_klass = k; }
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77
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78 // interpreter support (offsets in bytes)
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79 static int holder_method_offset() { return offset_of(CompiledICHolder, _holder_method); }
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80 static int holder_klass_offset() { return offset_of(CompiledICHolder, _holder_klass); }
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81
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82 CompiledICHolder* next() { return _next; }
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83 void set_next(CompiledICHolder* n) { _next = n; }
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84
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85 // Verify
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86 void verify_on(outputStream* st);
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87
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88 // Printing
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89 void print_on(outputStream* st) const;
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90 void print_value_on(outputStream* st) const;
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91
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92 const char* internal_name() const { return "{compiledICHolder}"; }
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93
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94 void claim() {
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95 #ifdef ASSERT
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96 Atomic::dec(&_live_not_claimed_count);
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97 #endif
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98 }
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99 };
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100
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101 #endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP