1 /*
   2  * Copyright (c) 1999, 2011, 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_CIINSTANCE_HPP
  26 #define SHARE_VM_CI_CIINSTANCE_HPP
  27 
  28 #include "ci/ciObject.hpp"
  29 #include "oops/instanceOop.hpp"
  30 
  31 // ciInstance
  32 //
  33 // This class represents an instanceOop in the HotSpot virtual
  34 // machine.  This is an oop which corresponds to a non-array
  35 // instance of java.lang.Object.
  36 class ciInstance : public ciObject {
  37   CI_PACKAGE_ACCESS
  38 
  39 protected:
  40   ciInstance(instanceHandle h_i) : ciObject(h_i) {
  41     assert(h_i()->is_instance(), "wrong type");
  42   }
  43 
  44   ciInstance(ciKlass* klass) : ciObject(klass) {}
  45 
  46   instanceOop get_instanceOop() { return (instanceOop)get_oop(); }
  47 
  48   const char* type_string() { return "ciInstance"; }
  49 
  50   void print_impl(outputStream* st);
  51 
  52 public:
  53   // If this object is a java mirror, return the corresponding type.
  54   // Otherwise, return NULL.
  55   // (Remember that a java mirror is an instance of java.lang.Class.)
  56   ciType* java_mirror_type();
  57 
  58   // What kind of ciObject is this?
  59   bool is_instance()     { return true; }
  60   bool is_java_object()  { return true; }
  61 
  62   // Constant value of a field.
  63   ciConstant field_value(ciField* field);
  64 
  65   // Constant value of a field at the specified offset.
  66   ciConstant field_value_by_offset(int field_offset);
  67 
  68   ciKlass* java_lang_Class_klass();
  69 };
  70 
  71 #endif // SHARE_VM_CI_CIINSTANCE_HPP