diff src/share/vm/oops/instanceClassLoaderKlass.hpp @ 3602:da91efe96a93

6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
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children aed758eda82a
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/oops/instanceClassLoaderKlass.hpp	Sat Sep 01 13:25:18 2012 -0400
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+/*
+ * Copyright (c) 2011, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP
+#define SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP
+
+#include "oops/instanceKlass.hpp"
+
+// An instanceClassLoaderKlass is a specialization of the InstanceKlass. It does
+// not add any field.  It is added to walk the dependencies for the class loader
+// key that this class loader points to.  This is how the loader_data graph is
+// walked and dependant class loaders are kept alive.  I thought we walked
+// the list later?
+
+class instanceClassLoaderKlass: public InstanceKlass {
+  friend class VMStructs;
+  friend class InstanceKlass;
+
+  // Constructor
+  instanceClassLoaderKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags, bool is_anonymous)
+    : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {}
+
+public:
+  virtual bool oop_is_instanceClassLoader() const { return true; }
+
+  instanceClassLoaderKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
+
+  // Iterators
+  int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
+    return oop_oop_iterate_v(obj, blk);
+  }
+  int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
+    return oop_oop_iterate_v_m(obj, blk, mr);
+  }
+
+#define InstanceClassLoaderKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)                \
+  int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);                         \
+  int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
+
+  ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DECL)
+  ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_DECL)
+
+#ifndef SERIALGC
+#define InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix)      \
+  int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
+
+  ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
+  ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceClassLoaderKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
+#endif // !SERIALGC
+
+    // Garbage collection
+  void oop_follow_contents(oop obj);
+
+  // Parallel Scavenge and Parallel Old
+  PARALLEL_GC_DECLS
+};
+
+#endif // SHARE_VM_OOPS_INSTANCECLASSLOADERKLASS_HPP