1 /*
 2  * Copyright (c) 1999, 2023, 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
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24 
25 #ifndef SHARE_CI_CIINSTANCE_HPP
26 #define SHARE_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   friend class ciField;
40 
41 protected:
42   ciInstance(instanceHandle h_i) : ciObject(h_i) {
43     assert(h_i()->is_instance_noinline(), "wrong type");
44   }
45 
46   ciInstance(ciKlass* klass) : ciObject(klass) {}
47 
48   const char* type_string() { return "ciInstance"; }
49 
50   void print_impl(outputStream* st);
51 
52   ciConstant field_value_impl(BasicType field_btype, int offset);
53 
54 public:
55   // If this object is a java mirror, return the corresponding type.
56   // Otherwise, return null.
57   // (Remember that a java mirror is an instance of java.lang.Class.)
58   ciType* java_mirror_type(bool* is_null_free_array = nullptr);
59 
60   // What kind of ciObject is this?
61   bool is_instance()     { 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_CI_CIINSTANCE_HPP