1 /*
   2  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_CI_CICPCACHE_HPP
  26 #define SHARE_VM_CI_CICPCACHE_HPP
  27 
  28 #include "ci/ciClassList.hpp"
  29 #include "ci/ciObject.hpp"
  30 #include "oops/cpCacheOop.hpp"
  31 
  32 // ciCPCache
  33 //
  34 // This class represents a constant pool cache.
  35 //
  36 // Note: This class is called ciCPCache as ciConstantPoolCache is used
  37 // for something different.
  38 class ciCPCache : public ciObject {
  39 private:
  40   constantPoolCacheOop get_cpCacheOop() {   // must be called inside a VM_ENTRY_MARK
  41     return (constantPoolCacheOop) get_oop();
  42   }
  43 
  44   ConstantPoolCacheEntry* entry_at(int i) {
  45     int raw_index = i;
  46     if (constantPoolCacheOopDesc::is_secondary_index(i))
  47       raw_index = constantPoolCacheOopDesc::decode_secondary_index(i);
  48     return get_cpCacheOop()->entry_at(raw_index);
  49   }
  50 
  51 public:
  52   ciCPCache(constantPoolCacheHandle cpcache) : ciObject(cpcache) {}
  53 
  54   // What kind of ciObject is this?
  55   bool is_cpcache() const { return true; }
  56 
  57   // Get the offset in bytes from the oop to the f1 field of the
  58   // requested entry.
  59   size_t get_f1_offset(int index);
  60 
  61   bool is_f1_null_at(int index);
  62 
  63   int get_pool_index(int index);
  64 
  65   void print();
  66 };
  67 
  68 #endif // SHARE_VM_CI_CICPCACHE_HPP