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hotspot/src/share/vm/classfile/loaderConstraints.hpp

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+/*
+ * Copyright 2003-2006 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.
+ *
+ */
+
+class LoaderConstraintEntry;
+
+class LoaderConstraintTable : public Hashtable {
+  friend class VMStructs;
+private:
+
+  enum Constants {
+    _loader_constraint_size = 107,                     // number of entries in constraint table
+    _nof_buckets            = 1009                     // number of buckets in hash table
+  };
+
+  LoaderConstraintEntry** find_loader_constraint(symbolHandle name,
+                                                 Handle loader);
+
+public:
+
+  LoaderConstraintTable(int nof_buckets);
+
+  LoaderConstraintEntry* new_entry(unsigned int hash, symbolOop name,
+                                   klassOop klass, int num_loaders,
+                                   int max_loaders);
+
+  LoaderConstraintEntry* bucket(int i) {
+    return (LoaderConstraintEntry*)Hashtable::bucket(i);
+  }
+
+  LoaderConstraintEntry** bucket_addr(int i) {
+    return (LoaderConstraintEntry**)Hashtable::bucket_addr(i);
+  }
+
+  // GC support
+  void oops_do(OopClosure* f);
+  void always_strong_classes_do(OopClosure* blk);
+
+  // Check class loader constraints
+  bool add_entry(symbolHandle name, klassOop klass1, Handle loader1,
+                                    klassOop klass2, Handle loader2);
+
+  void check_signature_loaders(symbolHandle signature, Handle loader1,
+                               Handle loader2, bool is_method, TRAPS);
+
+  klassOop find_constrained_klass(symbolHandle name, Handle loader);
+  klassOop find_constrained_elem_klass(symbolHandle name, symbolHandle elem_name,
+                                       Handle loader, TRAPS);
+
+
+  // Class loader constraints
+
+  void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree);
+  void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader,
+                                klassOop klass);
+  void merge_loader_constraints(LoaderConstraintEntry** pp1,
+                                LoaderConstraintEntry** pp2, klassOop klass);
+
+  bool check_or_update(instanceKlassHandle k, Handle loader,
+                              symbolHandle name);
+
+
+  void purge_loader_constraints(BoolObjectClosure* is_alive);
+
+  void verify(Dictionary* dictionary);
+#ifndef PRODUCT
+  void print();
+#endif
+};
+
+class LoaderConstraintEntry : public HashtableEntry {
+  friend class VMStructs;
+private:
+  symbolOop              _name;                   // class name
+  int                    _num_loaders;
+  int                    _max_loaders;
+  oop*                   _loaders;                // initiating loaders
+
+public:
+
+  klassOop klass() { return (klassOop)literal(); }
+  klassOop* klass_addr() { return (klassOop*)literal_addr(); }
+  void set_klass(klassOop k) { set_literal(k); }
+
+  LoaderConstraintEntry* next() {
+    return (LoaderConstraintEntry*)HashtableEntry::next();
+  }
+
+  LoaderConstraintEntry** next_addr() {
+    return (LoaderConstraintEntry**)HashtableEntry::next_addr();
+  }
+  void set_next(LoaderConstraintEntry* next) {
+    HashtableEntry::set_next(next);
+  }
+
+  symbolOop name() { return _name; }
+  symbolOop* name_addr() { return &_name; }
+  void set_name(symbolOop name) { _name = name; }
+
+  int num_loaders() { return _num_loaders; }
+  void set_num_loaders(int i) { _num_loaders = i; }
+
+  int max_loaders() { return _max_loaders; }
+  void set_max_loaders(int i) { _max_loaders = i; }
+
+  oop* loaders() { return _loaders; }
+  void set_loaders(oop* loaders) { _loaders = loaders; }
+
+  oop loader(int i) { return _loaders[i]; }
+  oop* loader_addr(int i) { return &_loaders[i]; }
+  void set_loader(int i, oop p) { _loaders[i] = p; }
+
+};