1 /*
   2  * Copyright (c) 1999, 2015, 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 #include "oops/oop.hpp"
  31 
  32 // ciInstance
  33 //
  34 // This class represents an instanceOop in the HotSpot virtual
  35 // machine.  This is an oop which corresponds to a non-array
  36 // instance of java.lang.Object.
  37 class ciInstance : public ciObject {
  38   CI_PACKAGE_ACCESS
  39 
  40 protected:
  41   ciInstance(instanceHandle h_i) : ciObject(h_i) {
  42     assert(h_i()->is_instance(), "wrong type");
  43   }
  44 
  45   ciInstance(ciKlass* klass) : ciObject(klass) {}
  46 
  47   instanceOop get_instanceOop() { return (instanceOop)get_oop(); }
  48 
  49   const char* type_string() { return "ciInstance"; }
  50 
  51   void print_impl(outputStream* st);
  52 
  53 public:
  54   // If this object is a java mirror, return the corresponding type.
  55   // Otherwise, return NULL.
  56   // (Remember that a java mirror is an instance of java.lang.Class.)
  57   ciType* java_mirror_type();
  58 
  59   // What kind of ciObject is this?
  60   bool is_instance()     { return true; }
  61   bool is_java_object()  { return true; }
  62 
  63   // Constant value of a field.
  64   ciConstant field_value(ciField* field);
  65 
  66   // Constant value of a field at the specified offset.
  67   ciConstant field_value_by_offset(int field_offset);
  68 
  69   ciKlass* java_lang_Class_klass();
  70 };
  71 
  72 #endif // SHARE_VM_CI_CIINSTANCE_HPP