duke@435: /*
coleenp@4037:  * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP
stefank@2314: #define SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP
stefank@2314: 
stefank@2314: #include "memory/heapInspection.hpp"
stefank@2314: #include "runtime/handles.hpp"
stefank@2314: #include "runtime/jniHandles.hpp"
stefank@2314: #include "runtime/synchronizer.hpp"
stefank@2314: #include "runtime/vm_operations.hpp"
kamg@2445: #include "prims/jvmtiExport.hpp"
stefank@2314: 
duke@435: // The following class hierarchy represents
duke@435: // a set of operations (VM_Operation) related to GC.
duke@435: //
duke@435: //  VM_Operation
duke@435: //      VM_GC_Operation
duke@435: //          VM_GC_HeapInspection
duke@435: //          VM_GenCollectForAllocation
duke@435: //          VM_GenCollectFull
duke@435: //          VM_GenCollectFullConcurrent
duke@435: //          VM_ParallelGCFailedAllocation
duke@435: //          VM_ParallelGCSystemGC
duke@435: //  VM_GC_Operation
duke@435: //   - implements methods common to all classes in the hierarchy:
duke@435: //     prevents multiple gc requests and manages lock on heap;
duke@435: //
duke@435: //  VM_GC_HeapInspection
duke@435: //   - prints class histogram on SIGBREAK if PrintClassHistogram
duke@435: //     is specified; and also the attach "inspectheap" operation
duke@435: //
duke@435: //  VM_GenCollectForAllocation
duke@435: //  VM_ParallelGCFailedAllocation
duke@435: //   - this operation is invoked when allocation is failed;
duke@435: //     operation performs garbage collection and tries to
duke@435: //     allocate afterwards;
duke@435: //
duke@435: //  VM_GenCollectFull
duke@435: //  VM_GenCollectFullConcurrent
duke@435: //  VM_ParallelGCSystemGC
duke@435: //   - these operations preform full collection of heaps of
duke@435: //     different kind
duke@435: //
duke@435: 
duke@435: class VM_GC_Operation: public VM_Operation {
duke@435:  protected:
duke@435:   BasicLock     _pending_list_basic_lock; // for refs pending list notification (PLL)
duke@435:   unsigned int  _gc_count_before;         // gc count before acquiring PLL
duke@435:   unsigned int  _full_gc_count_before;    // full gc count before acquiring PLL
duke@435:   bool          _full;                    // whether a "full" collection
duke@435:   bool          _prologue_succeeded;      // whether doit_prologue succeeded
duke@435:   GCCause::Cause _gc_cause;                // the putative cause for this gc op
duke@435:   bool          _gc_locked;               // will be set if gc was locked
duke@435: 
duke@435:   virtual bool skip_operation() const;
duke@435: 
duke@435:   // java.lang.ref.Reference support
duke@435:   void acquire_pending_list_lock();
duke@435:   void release_and_notify_pending_list_lock();
duke@435: 
duke@435:  public:
duke@435:   VM_GC_Operation(unsigned int gc_count_before,
brutisso@2532:                   GCCause::Cause _cause,
duke@435:                   unsigned int full_gc_count_before = 0,
duke@435:                   bool full = false) {
duke@435:     _full = full;
duke@435:     _prologue_succeeded = false;
duke@435:     _gc_count_before    = gc_count_before;
duke@435: 
duke@435:     // A subclass constructor will likely overwrite the following
brutisso@2532:     _gc_cause           = _cause;
duke@435: 
duke@435:     _gc_locked = false;
duke@435: 
tonyp@2011:     _full_gc_count_before = full_gc_count_before;
jmasa@1822:     // In ParallelScavengeHeap::mem_allocate() collections can be
jmasa@1822:     // executed within a loop and _all_soft_refs_clear can be set
jmasa@1822:     // true after they have been cleared by a collection and another
jmasa@1822:     // collection started so that _all_soft_refs_clear can be true
jmasa@1822:     // when this collection is started.  Don't assert that
jmasa@1822:     // _all_soft_refs_clear have to be false here even though
jmasa@1822:     // mutators have run.  Soft refs will be cleared again in this
jmasa@1822:     // collection.
duke@435:   }
jmasa@1822:   ~VM_GC_Operation() {
jmasa@1822:     CollectedHeap* ch = Universe::heap();
jmasa@1822:     ch->collector_policy()->set_all_soft_refs_clear(false);
jmasa@1822:   }
duke@435: 
duke@435:   // Acquire the reference synchronization lock
duke@435:   virtual bool doit_prologue();
duke@435:   // Do notifyAll (if needed) and release held lock
duke@435:   virtual void doit_epilogue();
duke@435: 
duke@435:   virtual bool allow_nested_vm_operations() const  { return true; }
duke@435:   bool prologue_succeeded() const { return _prologue_succeeded; }
duke@435: 
duke@435:   void set_gc_locked() { _gc_locked = true; }
duke@435:   bool gc_locked() const  { return _gc_locked; }
duke@435: 
duke@435:   static void notify_gc_begin(bool full = false);
duke@435:   static void notify_gc_end();
duke@435: };
duke@435: 
duke@435: 
duke@435: class VM_GC_HeapInspection: public VM_GC_Operation {
duke@435:  private:
duke@435:   outputStream* _out;
duke@435:   bool _full_gc;
ysr@1050:   bool _need_prologue;
duke@435:  public:
ysr@1050:   VM_GC_HeapInspection(outputStream* out, bool request_full_gc,
ysr@1050:                        bool need_prologue) :
duke@435:     VM_GC_Operation(0 /* total collections,      dummy, ignored */,
brutisso@2532:                     GCCause::_heap_inspection /* GC Cause */,
duke@435:                     0 /* total full collections, dummy, ignored */,
duke@435:                     request_full_gc) {
duke@435:     _out = out;
duke@435:     _full_gc = request_full_gc;
ysr@1050:     _need_prologue = need_prologue;
duke@435:   }
duke@435: 
duke@435:   ~VM_GC_HeapInspection() {}
duke@435:   virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }
duke@435:   virtual bool skip_operation() const;
duke@435:   virtual bool doit_prologue();
duke@435:   virtual void doit();
duke@435: };
duke@435: 
duke@435: 
duke@435: class VM_GenCollectForAllocation: public VM_GC_Operation {
duke@435:  private:
duke@435:   HeapWord*   _res;
duke@435:   size_t      _size;                       // size of object to be allocated.
duke@435:   bool        _tlab;                       // alloc is of a tlab.
duke@435:  public:
duke@435:   VM_GenCollectForAllocation(size_t size,
duke@435:                              bool tlab,
duke@435:                              unsigned int gc_count_before)
brutisso@2532:     : VM_GC_Operation(gc_count_before, GCCause::_allocation_failure),
duke@435:       _size(size),
duke@435:       _tlab(tlab) {
duke@435:     _res = NULL;
duke@435:   }
duke@435:   ~VM_GenCollectForAllocation()  {}
duke@435:   virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; }
duke@435:   virtual void doit();
duke@435:   HeapWord* result() const       { return _res; }
duke@435: };
duke@435: 
duke@435: 
duke@435: // VM operation to invoke a collection of the heap as a
duke@435: // GenCollectedHeap heap.
duke@435: class VM_GenCollectFull: public VM_GC_Operation {
duke@435:  private:
duke@435:   int _max_level;
duke@435:  public:
duke@435:   VM_GenCollectFull(unsigned int gc_count_before,
duke@435:                     unsigned int full_gc_count_before,
duke@435:                     GCCause::Cause gc_cause,
duke@435:                       int max_level)
brutisso@2532:     : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */),
brutisso@2532:       _max_level(max_level) { }
duke@435:   ~VM_GenCollectFull() {}
duke@435:   virtual VMOp_Type type() const { return VMOp_GenCollectFull; }
duke@435:   virtual void doit();
duke@435: };
apetrusenko@574: 
coleenp@4037: class VM_CollectForMetadataAllocation: public VM_GC_Operation {
apetrusenko@574:  private:
coleenp@4037:   MetaWord*                _result;
apetrusenko@574:   size_t      _size;                       // size of object to be allocated
coleenp@4037:   Metaspace::MetadataType  _mdtype;
coleenp@4037:   ClassLoaderData*         _loader_data;
apetrusenko@574:  public:
coleenp@4037:   VM_CollectForMetadataAllocation(ClassLoaderData* loader_data,
coleenp@4037:                                   size_t size, Metaspace::MetadataType mdtype,
apetrusenko@574:                                       unsigned int gc_count_before,
apetrusenko@574:                                       unsigned int full_gc_count_before,
apetrusenko@574:                                       GCCause::Cause gc_cause)
brutisso@2532:     : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true),
coleenp@4037:       _loader_data(loader_data), _size(size), _mdtype(mdtype), _result(NULL) {
apetrusenko@574:   }
coleenp@4037:   ~VM_CollectForMetadataAllocation()  {
coleenp@4037:     MetaspaceGC::set_expand_after_GC(false);
coleenp@4037:   }
coleenp@4037:   virtual VMOp_Type type() const { return VMOp_CollectForMetadataAllocation; }
apetrusenko@574:   virtual void doit();
coleenp@4037:   MetaWord* result() const       { return _result; }
apetrusenko@574: };
stefank@2314: 
kamg@2445: class SvcGCMarker : public StackObj {
kamg@2445:  private:
kamg@2445:   JvmtiGCMarker _jgcm;
kamg@2445:  public:
kamg@2445:   typedef enum { MINOR, FULL, OTHER } reason_type;
kamg@2445: 
kamg@2445:   SvcGCMarker(reason_type reason ) {
kamg@2445:     VM_GC_Operation::notify_gc_begin(reason == FULL);
tonyp@2381:   }
tonyp@2381: 
kamg@2445:   ~SvcGCMarker() {
tonyp@2381:     VM_GC_Operation::notify_gc_end();
tonyp@2381:   }
tonyp@2381: };
tonyp@2381: 
stefank@2314: #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP