1 /*
   2  * Copyright (c) 1999, 2005, 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 // ciInstance
  26 //
  27 // This class represents an instanceOop in the HotSpot virtual
  28 // machine.  This is an oop which corresponds to a non-array
  29 // instance of java.lang.Object.
  30 class ciInstance : public ciObject {
  31   CI_PACKAGE_ACCESS
  32 
  33 protected:
  34   ciInstance(instanceHandle h_i) : ciObject(h_i) {
  35     assert(h_i()->is_instance(), "wrong type");
  36   }
  37 
  38   ciInstance(ciKlass* klass) : ciObject(klass) {}
  39 
  40   instanceOop get_instanceOop() { return (instanceOop)get_oop(); }
  41 
  42   const char* type_string() { return "ciInstance"; }
  43 
  44   void print_impl(outputStream* st);
  45 
  46 public:
  47   // If this object is a java mirror, return the corresponding type.
  48   // Otherwise, return NULL.
  49   // (Remember that a java mirror is an instance of java.lang.Class.)
  50   ciType* java_mirror_type();
  51 
  52   // What kind of ciObject is this?
  53   bool is_instance()     { return true; }
  54   bool is_java_object()  { return true; }
  55 
  56   // Constant value of a field.
  57   ciConstant field_value(ciField* field);
  58 
  59   // Constant value of a field at the specified offset.
  60   ciConstant field_value_by_offset(int field_offset);
  61 };