1 /*
   2  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright 2009 Red Hat, Inc.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #ifndef SHARE_VM_SHARK_SHARKCONSTANT_HPP
  27 #define SHARE_VM_SHARK_SHARKCONSTANT_HPP
  28 
  29 #include "ci/ciStreams.hpp"
  30 #include "memory/allocation.hpp"
  31 #include "shark/sharkBuilder.hpp"
  32 #include "shark/sharkValue.hpp"
  33 
  34 class SharkConstant : public ResourceObj {
  35  public:
  36   static SharkConstant* for_ldc(ciBytecodeStream* iter);
  37   static SharkConstant* for_field(ciBytecodeStream* iter);
  38 
  39  private:
  40   SharkConstant(ciConstant constant, ciType* type);
  41 
  42  private:
  43   SharkValue* _value;
  44   ciObject*   _object;
  45   ciType*     _type;
  46   bool        _is_loaded;
  47   bool        _is_nonzero;
  48   bool        _is_two_word;
  49 
  50  public:
  51   bool is_loaded() const {
  52     return _is_loaded;
  53   }
  54   bool is_nonzero() const {
  55     assert(is_loaded(), "should be");
  56     return _is_nonzero;
  57   }
  58   bool is_two_word() const {
  59     assert(is_loaded(), "should be");
  60     return _is_two_word;
  61   }
  62 
  63  public:
  64   SharkValue* value(SharkBuilder* builder) {
  65     assert(is_loaded(), "should be");
  66     if (_value == NULL) {
  67       _value = SharkValue::create_generic(
  68         _type, builder->CreateInlineOop(_object), _is_nonzero);
  69     }
  70     return _value;
  71   }
  72 };
  73 
  74 #endif // SHARE_VM_SHARK_SHARKCONSTANT_HPP