1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/shared/vmGCOperations.hpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,168 @@
1.4 +/*
1.5 + * Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +// The following class hierarchy represents
1.29 +// a set of operations (VM_Operation) related to GC.
1.30 +//
1.31 +// VM_Operation
1.32 +// VM_GC_Operation
1.33 +// VM_GC_HeapInspection
1.34 +// VM_GenCollectForAllocation
1.35 +// VM_GenCollectFull
1.36 +// VM_GenCollectFullConcurrent
1.37 +// VM_ParallelGCFailedAllocation
1.38 +// VM_ParallelGCFailedPermanentAllocation
1.39 +// VM_ParallelGCSystemGC
1.40 +// VM_GC_Operation
1.41 +// - implements methods common to all classes in the hierarchy:
1.42 +// prevents multiple gc requests and manages lock on heap;
1.43 +//
1.44 +// VM_GC_HeapInspection
1.45 +// - prints class histogram on SIGBREAK if PrintClassHistogram
1.46 +// is specified; and also the attach "inspectheap" operation
1.47 +//
1.48 +// VM_GenCollectForAllocation
1.49 +// VM_ParallelGCFailedAllocation
1.50 +// VM_ParallelGCFailedPermanentAllocation
1.51 +// - this operation is invoked when allocation is failed;
1.52 +// operation performs garbage collection and tries to
1.53 +// allocate afterwards;
1.54 +//
1.55 +// VM_GenCollectFull
1.56 +// VM_GenCollectFullConcurrent
1.57 +// VM_ParallelGCSystemGC
1.58 +// - these operations preform full collection of heaps of
1.59 +// different kind
1.60 +//
1.61 +
1.62 +class VM_GC_Operation: public VM_Operation {
1.63 + protected:
1.64 + BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL)
1.65 + unsigned int _gc_count_before; // gc count before acquiring PLL
1.66 + unsigned int _full_gc_count_before; // full gc count before acquiring PLL
1.67 + bool _full; // whether a "full" collection
1.68 + bool _prologue_succeeded; // whether doit_prologue succeeded
1.69 + GCCause::Cause _gc_cause; // the putative cause for this gc op
1.70 + bool _gc_locked; // will be set if gc was locked
1.71 +
1.72 + virtual bool skip_operation() const;
1.73 +
1.74 + // java.lang.ref.Reference support
1.75 + void acquire_pending_list_lock();
1.76 + void release_and_notify_pending_list_lock();
1.77 +
1.78 + public:
1.79 + VM_GC_Operation(unsigned int gc_count_before,
1.80 + unsigned int full_gc_count_before = 0,
1.81 + bool full = false) {
1.82 + _full = full;
1.83 + _prologue_succeeded = false;
1.84 + _gc_count_before = gc_count_before;
1.85 +
1.86 + // A subclass constructor will likely overwrite the following
1.87 + _gc_cause = GCCause::_no_cause_specified;
1.88 +
1.89 + _gc_locked = false;
1.90 +
1.91 + if (full) {
1.92 + _full_gc_count_before = full_gc_count_before;
1.93 + }
1.94 + }
1.95 + ~VM_GC_Operation() {}
1.96 +
1.97 + // Acquire the reference synchronization lock
1.98 + virtual bool doit_prologue();
1.99 + // Do notifyAll (if needed) and release held lock
1.100 + virtual void doit_epilogue();
1.101 +
1.102 + virtual bool allow_nested_vm_operations() const { return true; }
1.103 + bool prologue_succeeded() const { return _prologue_succeeded; }
1.104 +
1.105 + void set_gc_locked() { _gc_locked = true; }
1.106 + bool gc_locked() const { return _gc_locked; }
1.107 +
1.108 + static void notify_gc_begin(bool full = false);
1.109 + static void notify_gc_end();
1.110 +};
1.111 +
1.112 +
1.113 +class VM_GC_HeapInspection: public VM_GC_Operation {
1.114 + private:
1.115 + outputStream* _out;
1.116 + bool _full_gc;
1.117 + public:
1.118 + VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
1.119 + VM_GC_Operation(0 /* total collections, dummy, ignored */,
1.120 + 0 /* total full collections, dummy, ignored */,
1.121 + request_full_gc) {
1.122 + _out = out;
1.123 + _full_gc = request_full_gc;
1.124 + }
1.125 +
1.126 + ~VM_GC_HeapInspection() {}
1.127 + virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }
1.128 + virtual bool skip_operation() const;
1.129 + virtual bool doit_prologue();
1.130 + virtual void doit();
1.131 +};
1.132 +
1.133 +
1.134 +class VM_GenCollectForAllocation: public VM_GC_Operation {
1.135 + private:
1.136 + HeapWord* _res;
1.137 + size_t _size; // size of object to be allocated.
1.138 + bool _tlab; // alloc is of a tlab.
1.139 + public:
1.140 + VM_GenCollectForAllocation(size_t size,
1.141 + bool tlab,
1.142 + unsigned int gc_count_before)
1.143 + : VM_GC_Operation(gc_count_before),
1.144 + _size(size),
1.145 + _tlab(tlab) {
1.146 + _res = NULL;
1.147 + }
1.148 + ~VM_GenCollectForAllocation() {}
1.149 + virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; }
1.150 + virtual void doit();
1.151 + HeapWord* result() const { return _res; }
1.152 +};
1.153 +
1.154 +
1.155 +// VM operation to invoke a collection of the heap as a
1.156 +// GenCollectedHeap heap.
1.157 +class VM_GenCollectFull: public VM_GC_Operation {
1.158 + private:
1.159 + int _max_level;
1.160 + public:
1.161 + VM_GenCollectFull(unsigned int gc_count_before,
1.162 + unsigned int full_gc_count_before,
1.163 + GCCause::Cause gc_cause,
1.164 + int max_level)
1.165 + : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */),
1.166 + _max_level(max_level)
1.167 + { _gc_cause = gc_cause; }
1.168 + ~VM_GenCollectFull() {}
1.169 + virtual VMOp_Type type() const { return VMOp_GenCollectFull; }
1.170 + virtual void doit();
1.171 +};
