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/*
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* Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// The following class hierarchy represents
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// a set of operations (VM_Operation) related to GC.
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//
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// VM_Operation
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// VM_GC_Operation
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// VM_GC_HeapInspection
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// VM_GenCollectForAllocation
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// VM_GenCollectFull
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// VM_GenCollectFullConcurrent
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// VM_ParallelGCFailedAllocation
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// VM_ParallelGCFailedPermanentAllocation
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// VM_ParallelGCSystemGC
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// VM_GC_Operation
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// - implements methods common to all classes in the hierarchy:
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// prevents multiple gc requests and manages lock on heap;
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//
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// VM_GC_HeapInspection
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// - prints class histogram on SIGBREAK if PrintClassHistogram
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// is specified; and also the attach "inspectheap" operation
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//
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// VM_GenCollectForAllocation
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// VM_ParallelGCFailedAllocation
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// VM_ParallelGCFailedPermanentAllocation
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// - this operation is invoked when allocation is failed;
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// operation performs garbage collection and tries to
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// allocate afterwards;
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//
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// VM_GenCollectFull
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// VM_GenCollectFullConcurrent
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// VM_ParallelGCSystemGC
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// - these operations preform full collection of heaps of
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// different kind
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//
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class VM_GC_Operation: public VM_Operation {
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protected:
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BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL)
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unsigned int _gc_count_before; // gc count before acquiring PLL
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unsigned int _full_gc_count_before; // full gc count before acquiring PLL
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bool _full; // whether a "full" collection
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bool _prologue_succeeded; // whether doit_prologue succeeded
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GCCause::Cause _gc_cause; // the putative cause for this gc op
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bool _gc_locked; // will be set if gc was locked
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virtual bool skip_operation() const;
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// java.lang.ref.Reference support
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void acquire_pending_list_lock();
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void release_and_notify_pending_list_lock();
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public:
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VM_GC_Operation(unsigned int gc_count_before,
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unsigned int full_gc_count_before = 0,
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bool full = false) {
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_full = full;
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_prologue_succeeded = false;
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_gc_count_before = gc_count_before;
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// A subclass constructor will likely overwrite the following
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_gc_cause = GCCause::_no_cause_specified;
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_gc_locked = false;
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if (full) {
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_full_gc_count_before = full_gc_count_before;
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}
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}
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~VM_GC_Operation() {}
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// Acquire the reference synchronization lock
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virtual bool doit_prologue();
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// Do notifyAll (if needed) and release held lock
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virtual void doit_epilogue();
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virtual bool allow_nested_vm_operations() const { return true; }
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bool prologue_succeeded() const { return _prologue_succeeded; }
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void set_gc_locked() { _gc_locked = true; }
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bool gc_locked() const { return _gc_locked; }
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static void notify_gc_begin(bool full = false);
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static void notify_gc_end();
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};
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class VM_GC_HeapInspection: public VM_GC_Operation {
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private:
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outputStream* _out;
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bool _full_gc;
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public:
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VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
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VM_GC_Operation(0 /* total collections, dummy, ignored */,
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0 /* total full collections, dummy, ignored */,
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request_full_gc) {
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_out = out;
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_full_gc = request_full_gc;
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}
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~VM_GC_HeapInspection() {}
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virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }
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virtual bool skip_operation() const;
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virtual bool doit_prologue();
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virtual void doit();
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};
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class VM_GenCollectForAllocation: public VM_GC_Operation {
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private:
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HeapWord* _res;
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size_t _size; // size of object to be allocated.
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bool _tlab; // alloc is of a tlab.
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public:
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VM_GenCollectForAllocation(size_t size,
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bool tlab,
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unsigned int gc_count_before)
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: VM_GC_Operation(gc_count_before),
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_size(size),
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_tlab(tlab) {
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_res = NULL;
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}
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~VM_GenCollectForAllocation() {}
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virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; }
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virtual void doit();
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HeapWord* result() const { return _res; }
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};
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// VM operation to invoke a collection of the heap as a
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// GenCollectedHeap heap.
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class VM_GenCollectFull: public VM_GC_Operation {
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private:
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int _max_level;
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public:
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VM_GenCollectFull(unsigned int gc_count_before,
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unsigned int full_gc_count_before,
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GCCause::Cause gc_cause,
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int max_level)
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: VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */),
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_max_level(max_level)
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{ _gc_cause = gc_cause; }
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~VM_GenCollectFull() {}
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virtual VMOp_Type type() const { return VMOp_GenCollectFull; }
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virtual void doit();
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};
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