1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/g1/g1RootProcessor.hpp Mon Dec 01 15:24:56 2014 +0100
1.3 @@ -0,0 +1,116 @@
1.4 +/*
1.5 + * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP
1.29 +#define SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP
1.30 +
1.31 +#include "memory/allocation.hpp"
1.32 +#include "memory/sharedHeap.hpp"
1.33 +#include "runtime/mutex.hpp"
1.34 +
1.35 +class CLDClosure;
1.36 +class CodeBlobClosure;
1.37 +class G1CollectedHeap;
1.38 +class G1ParPushHeapRSClosure;
1.39 +class Monitor;
1.40 +class OopClosure;
1.41 +class SubTasksDone;
1.42 +
1.43 +// Scoped object to assist in applying oop, CLD and code blob closures to
1.44 +// root locations. Handles claiming of different root scanning tasks
1.45 +// and takes care of global state for root scanning via a StrongRootsScope.
1.46 +// In the parallel case there is a shared G1RootProcessor object where all
1.47 +// worker thread call the process_roots methods.
1.48 +class G1RootProcessor : public StackObj {
1.49 + G1CollectedHeap* _g1h;
1.50 + SubTasksDone* _process_strong_tasks;
1.51 + SharedHeap::StrongRootsScope _srs;
1.52 +
1.53 + // Used to implement the Thread work barrier.
1.54 + Monitor _lock;
1.55 + volatile jint _n_workers_discovered_strong_classes;
1.56 +
1.57 + enum G1H_process_roots_tasks {
1.58 + G1RP_PS_Universe_oops_do,
1.59 + G1RP_PS_JNIHandles_oops_do,
1.60 + G1RP_PS_ObjectSynchronizer_oops_do,
1.61 + G1RP_PS_FlatProfiler_oops_do,
1.62 + G1RP_PS_Management_oops_do,
1.63 + G1RP_PS_SystemDictionary_oops_do,
1.64 + G1RP_PS_ClassLoaderDataGraph_oops_do,
1.65 + G1RP_PS_jvmti_oops_do,
1.66 + G1RP_PS_CodeCache_oops_do,
1.67 + G1RP_PS_filter_satb_buffers,
1.68 + G1RP_PS_refProcessor_oops_do,
1.69 + // Leave this one last.
1.70 + G1RP_PS_NumElements
1.71 + };
1.72 +
1.73 + void worker_has_discovered_all_strong_classes();
1.74 + void wait_until_all_strong_classes_discovered();
1.75 +
1.76 + void process_java_roots(OopClosure* scan_non_heap_roots,
1.77 + CLDClosure* thread_stack_clds,
1.78 + CLDClosure* scan_strong_clds,
1.79 + CLDClosure* scan_weak_clds,
1.80 + CodeBlobClosure* scan_strong_code);
1.81 +
1.82 + void process_vm_roots(OopClosure* scan_non_heap_roots,
1.83 + OopClosure* scan_non_heap_weak_roots);
1.84 +
1.85 +public:
1.86 + G1RootProcessor(G1CollectedHeap* g1h);
1.87 +
1.88 + // Apply closures to the strongly and weakly reachable roots in the system
1.89 + // in a single pass.
1.90 + // Record and report timing measurements for sub phases using the worker_i
1.91 + void evacuate_roots(OopClosure* scan_non_heap_roots,
1.92 + OopClosure* scan_non_heap_weak_roots,
1.93 + CLDClosure* scan_strong_clds,
1.94 + CLDClosure* scan_weak_clds,
1.95 + bool trace_metadata,
1.96 + uint worker_i);
1.97 +
1.98 + // Apply oops, clds and blobs to all strongly reachable roots in the system
1.99 + void process_strong_roots(OopClosure* oops,
1.100 + CLDClosure* clds,
1.101 + CodeBlobClosure* blobs);
1.102 +
1.103 + // Apply oops, clds and blobs to strongly and weakly reachable roots in the system
1.104 + void process_all_roots(OopClosure* oops,
1.105 + CLDClosure* clds,
1.106 + CodeBlobClosure* blobs);
1.107 +
1.108 + // Apply scan_rs to all locations in the union of the remembered sets for all
1.109 + // regions in the collection set
1.110 + // (having done "set_region" to indicate the region in which the root resides),
1.111 + void scan_remembered_sets(G1ParPushHeapRSClosure* scan_rs,
1.112 + OopClosure* scan_non_heap_weak_roots,
1.113 + uint worker_i);
1.114 +
1.115 + // Inform the root processor about the number of worker threads
1.116 + void set_num_workers(int active_workers);
1.117 +};
1.118 +
1.119 +#endif // SHARE_VM_GC_IMPLEMENTATION_G1_ROOTPROCESSOR_HPP
