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annotate src/share/vm/gc_implementation/g1/g1RootProcessor.hpp @ 22923:c04f46b4abe4

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8068036: assert(is_available(index)) failed in G1 cset Summary: Some verification code iterated over the heap using the region mapping array. This is not allowed. Changed to use the regular iteration method with closure. Reviewed-by: jwilhelm, brutisso
author tschatzl
date Tue, 31 Mar 2015 11:36:37 +0200
parents 3ca53859c3c7
children c0205eddb317
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1 /*
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2 * Copyright (c) 2015, 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_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "memory/sharedHeap.hpp"
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30 #include "runtime/mutex.hpp"
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31
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32 class CLDClosure;
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33 class CodeBlobClosure;
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34 class G1CollectedHeap;
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35 class G1GCPhaseTimes;
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36 class G1ParPushHeapRSClosure;
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37 class Monitor;
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38 class OopClosure;
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39 class SubTasksDone;
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40
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41 // Scoped object to assist in applying oop, CLD and code blob closures to
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42 // root locations. Handles claiming of different root scanning tasks
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43 // and takes care of global state for root scanning via a StrongRootsScope.
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44 // In the parallel case there is a shared G1RootProcessor object where all
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45 // worker thread call the process_roots methods.
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46 class G1RootProcessor : public StackObj {
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47 G1CollectedHeap* _g1h;
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48 SubTasksDone* _process_strong_tasks;
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49 SharedHeap::StrongRootsScope _srs;
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50
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51 // Used to implement the Thread work barrier.
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52 Monitor _lock;
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53 volatile jint _n_workers_discovered_strong_classes;
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54
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55 enum G1H_process_roots_tasks {
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56 G1RP_PS_Universe_oops_do,
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57 G1RP_PS_JNIHandles_oops_do,
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58 G1RP_PS_ObjectSynchronizer_oops_do,
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59 G1RP_PS_FlatProfiler_oops_do,
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60 G1RP_PS_Management_oops_do,
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61 G1RP_PS_SystemDictionary_oops_do,
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62 G1RP_PS_ClassLoaderDataGraph_oops_do,
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63 G1RP_PS_jvmti_oops_do,
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64 G1RP_PS_CodeCache_oops_do,
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65 G1RP_PS_filter_satb_buffers,
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66 G1RP_PS_refProcessor_oops_do,
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67 // Leave this one last.
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68 G1RP_PS_NumElements
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69 };
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70
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71 void worker_has_discovered_all_strong_classes();
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72 void wait_until_all_strong_classes_discovered();
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73
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74 void process_java_roots(OopClosure* scan_non_heap_roots,
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75 CLDClosure* thread_stack_clds,
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76 CLDClosure* scan_strong_clds,
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77 CLDClosure* scan_weak_clds,
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78 CodeBlobClosure* scan_strong_code,
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79 G1GCPhaseTimes* phase_times,
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80 uint worker_i);
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81
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82 void process_vm_roots(OopClosure* scan_non_heap_roots,
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83 OopClosure* scan_non_heap_weak_roots,
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84 G1GCPhaseTimes* phase_times,
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85 uint worker_i);
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86
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87 public:
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88 G1RootProcessor(G1CollectedHeap* g1h);
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89
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90 // Apply closures to the strongly and weakly reachable roots in the system
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91 // in a single pass.
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92 // Record and report timing measurements for sub phases using the worker_i
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93 void evacuate_roots(OopClosure* scan_non_heap_roots,
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94 OopClosure* scan_non_heap_weak_roots,
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95 CLDClosure* scan_strong_clds,
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96 CLDClosure* scan_weak_clds,
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97 bool trace_metadata,
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98 uint worker_i);
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99
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100 // Apply oops, clds and blobs to all strongly reachable roots in the system
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101 void process_strong_roots(OopClosure* oops,
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102 CLDClosure* clds,
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103 CodeBlobClosure* blobs);
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104
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105 // Apply oops, clds and blobs to strongly and weakly reachable roots in the system
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106 void process_all_roots(OopClosure* oops,
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107 CLDClosure* clds,
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108 CodeBlobClosure* blobs);
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109
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110 // Apply scan_rs to all locations in the union of the remembered sets for all
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111 // regions in the collection set
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112 // (having done "set_region" to indicate the region in which the root resides),
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113 void scan_remembered_sets(G1ParPushHeapRSClosure* scan_rs,
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114 OopClosure* scan_non_heap_weak_roots,
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115 uint worker_i);
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116
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117 // Inform the root processor about the number of worker threads
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118 void set_num_workers(int active_workers);
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119 };
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120
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121 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP