--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc_implementation/shared/vmGCOperations.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,168 @@
+/*
+ * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// The following class hierarchy represents
+// a set of operations (VM_Operation) related to GC.
+//
+// VM_Operation
+// VM_GC_Operation
+// VM_GC_HeapInspection
+// VM_GenCollectForAllocation
+// VM_GenCollectFull
+// VM_GenCollectFullConcurrent
+// VM_ParallelGCFailedAllocation
+// VM_ParallelGCFailedPermanentAllocation
+// VM_ParallelGCSystemGC
+// VM_GC_Operation
+// - implements methods common to all classes in the hierarchy:
+// prevents multiple gc requests and manages lock on heap;
+//
+// VM_GC_HeapInspection
+// - prints class histogram on SIGBREAK if PrintClassHistogram
+// is specified; and also the attach "inspectheap" operation
+//
+// VM_GenCollectForAllocation
+// VM_ParallelGCFailedAllocation
+// VM_ParallelGCFailedPermanentAllocation
+// - this operation is invoked when allocation is failed;
+// operation performs garbage collection and tries to
+// allocate afterwards;
+//
+// VM_GenCollectFull
+// VM_GenCollectFullConcurrent
+// VM_ParallelGCSystemGC
+// - these operations preform full collection of heaps of
+// different kind
+//
+
+class VM_GC_Operation: public VM_Operation {
+ protected:
+ BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL)
+ unsigned int _gc_count_before; // gc count before acquiring PLL
+ unsigned int _full_gc_count_before; // full gc count before acquiring PLL
+ bool _full; // whether a "full" collection
+ bool _prologue_succeeded; // whether doit_prologue succeeded
+ GCCause::Cause _gc_cause; // the putative cause for this gc op
+ bool _gc_locked; // will be set if gc was locked
+
+ virtual bool skip_operation() const;
+
+ // java.lang.ref.Reference support
+ void acquire_pending_list_lock();
+ void release_and_notify_pending_list_lock();
+
+ public:
+ VM_GC_Operation(unsigned int gc_count_before,
+ unsigned int full_gc_count_before = 0,
+ bool full = false) {
+ _full = full;
+ _prologue_succeeded = false;
+ _gc_count_before = gc_count_before;
+
+ // A subclass constructor will likely overwrite the following
+ _gc_cause = GCCause::_no_cause_specified;
+
+ _gc_locked = false;
+
+ if (full) {
+ _full_gc_count_before = full_gc_count_before;
+ }
+ }
+ ~VM_GC_Operation() {}
+
+ // Acquire the reference synchronization lock
+ virtual bool doit_prologue();
+ // Do notifyAll (if needed) and release held lock
+ virtual void doit_epilogue();
+
+ virtual bool allow_nested_vm_operations() const { return true; }
+ bool prologue_succeeded() const { return _prologue_succeeded; }
+
+ void set_gc_locked() { _gc_locked = true; }
+ bool gc_locked() const { return _gc_locked; }
+
+ static void notify_gc_begin(bool full = false);
+ static void notify_gc_end();
+};
+
+
+class VM_GC_HeapInspection: public VM_GC_Operation {
+ private:
+ outputStream* _out;
+ bool _full_gc;
+ public:
+ VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
+ VM_GC_Operation(0 /* total collections, dummy, ignored */,
+ 0 /* total full collections, dummy, ignored */,
+ request_full_gc) {
+ _out = out;
+ _full_gc = request_full_gc;
+ }
+
+ ~VM_GC_HeapInspection() {}
+ virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }
+ virtual bool skip_operation() const;
+ virtual bool doit_prologue();
+ virtual void doit();
+};
+
+
+class VM_GenCollectForAllocation: public VM_GC_Operation {
+ private:
+ HeapWord* _res;
+ size_t _size; // size of object to be allocated.
+ bool _tlab; // alloc is of a tlab.
+ public:
+ VM_GenCollectForAllocation(size_t size,
+ bool tlab,
+ unsigned int gc_count_before)
+ : VM_GC_Operation(gc_count_before),
+ _size(size),
+ _tlab(tlab) {
+ _res = NULL;
+ }
+ ~VM_GenCollectForAllocation() {}
+ virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; }
+ virtual void doit();
+ HeapWord* result() const { return _res; }
+};
+
+
+// VM operation to invoke a collection of the heap as a
+// GenCollectedHeap heap.
+class VM_GenCollectFull: public VM_GC_Operation {
+ private:
+ int _max_level;
+ public:
+ VM_GenCollectFull(unsigned int gc_count_before,
+ unsigned int full_gc_count_before,
+ GCCause::Cause gc_cause,
+ int max_level)
+ : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */),
+ _max_level(max_level)
+ { _gc_cause = gc_cause; }
+ ~VM_GenCollectFull() {}
+ virtual VMOp_Type type() const { return VMOp_GenCollectFull; }
+ virtual void doit();
+};