aoqi@0: /*
aoqi@0:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP
aoqi@0: #define SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP
aoqi@0: 
aoqi@0: #include "memory/allocation.hpp"
aoqi@0: 
aoqi@0: class CodeBlobClosure;
mgerdin@7208: class CodeRootSetTable;
mgerdin@7208: class HeapRegion;
mgerdin@7208: class nmethod;
tschatzl@6925: 
aoqi@0: // Implements storage for a set of code roots.
aoqi@0: // All methods that modify the set are not thread-safe except if otherwise noted.
aoqi@0: class G1CodeRootSet VALUE_OBJ_CLASS_SPEC {
mgerdin@7208:   friend class G1CodeRootSetTest;
aoqi@0:  private:
aoqi@0: 
mgerdin@7208:   const static size_t SmallSize = 32;
mgerdin@7208:   const static size_t Threshold = 24;
mgerdin@7208:   const static size_t LargeSize = 512;
aoqi@0: 
mgerdin@7208:   CodeRootSetTable* _table;
mgerdin@7208:   CodeRootSetTable* load_acquire_table();
aoqi@0: 
aoqi@0:   size_t _length;
mgerdin@7208: 
mgerdin@7208:   void move_to_large();
mgerdin@7208:   void allocate_small_table();
aoqi@0: 
aoqi@0:  public:
mgerdin@7208:   G1CodeRootSet() : _table(NULL), _length(0) {}
aoqi@0:   ~G1CodeRootSet();
aoqi@0: 
mgerdin@7208:   static void purge();
aoqi@0: 
mgerdin@7208:   static size_t static_mem_size();
aoqi@0: 
aoqi@0:   void add(nmethod* method);
aoqi@0: 
mgerdin@7208:   bool remove(nmethod* method);
aoqi@0: 
mgerdin@7208:   // Safe to call without synchronization, but may return false negatives.
aoqi@0:   bool contains(nmethod* method);
aoqi@0: 
aoqi@0:   void clear();
aoqi@0: 
aoqi@0:   void nmethods_do(CodeBlobClosure* blk) const;
aoqi@0: 
mgerdin@7208:   // Remove all nmethods which no longer contain pointers into our "owner" region
mgerdin@7208:   void clean(HeapRegion* owner);
mgerdin@7208: 
mgerdin@7208:   bool is_empty() {
mgerdin@7208:     bool empty = length() == 0;
mgerdin@7208:     assert(empty == (_table == NULL), "is empty only if table is deallocated");
mgerdin@7208:     return empty;
mgerdin@7208:   }
aoqi@0: 
aoqi@0:   // Length in elements
aoqi@0:   size_t length() const { return _length; }
aoqi@0: 
aoqi@0:   // Memory size in bytes taken by this set.
aoqi@0:   size_t mem_size();
aoqi@0: 
aoqi@0: };
aoqi@0: 
aoqi@0: #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP