1/*
2 * Copyright (c) 2000, 2017, 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_CITYPE_HPP
26#define SHARE_VM_CI_CITYPE_HPP
27
28#include "ci/ciMetadata.hpp"
29
30// ciType
31//
32// This class represents either a class (T_OBJECT), array (T_ARRAY),
33// or one of the primitive types such as T_INT.
34class ciType : public ciMetadata {
35  CI_PACKAGE_ACCESS
36  friend class ciKlass;
37  friend class ciReturnAddress;
38
39private:
40  BasicType _basic_type;
41
42  ciType(BasicType t);     // for primitive and unloaded types
43  ciType(Klass* k);        // for subclasses (reference types)
44
45  const char* type_string() { return "ciType"; }
46
47  void print_impl(outputStream* st);
48
49  // Distinguished instances of primitive ciTypes..
50  static ciType* _basic_types[T_CONFLICT+1];
51
52public:
53  BasicType basic_type() const              { return _basic_type; }
54
55  // Returns true iff the types are identical, or if both are klasses
56  // and the is_subtype_of relation holds between the klasses.
57  bool is_subtype_of(ciType* type);
58
59  // Get the instance of java.lang.Class corresponding to this type.
60  // There are mirrors for instance, array, and primitive types (incl. void).
61  virtual ciInstance*    java_mirror();
62
63  // Get the class which "boxes" (or "wraps") values of this type.
64  // Example:  short is boxed by java.lang.Short, etc.
65  // Returns self if it is a reference type.
66  // Returns NULL for void, since null is used in such cases.
67  ciKlass*  box_klass();
68
69  // Returns true if this is not a klass or array (i.e., not a reference type).
70  bool is_primitive_type() const            { return basic_type() != T_OBJECT && basic_type() != T_ARRAY; }
71  int size() const                          { return type2size[basic_type()]; }
72  bool is_void() const                      { return basic_type() == T_VOID; }
73  bool is_one_word() const                  { return size() == 1; }
74  bool is_two_word() const                  { return size() == 2; }
75
76  // What kind of ciObject is this?
77  bool is_type() const                      { return true; }
78  bool is_classless() const                 { return is_primitive_type(); }
79
80  const char* name();
81  virtual void print_name_on(outputStream* st);
82  void print_name() {
83    print_name_on(tty);
84  }
85
86  static ciType* make(BasicType t);
87};
88
89
90// ciReturnAddress
91//
92// This class represents the type of a specific return address in the
93// bytecodes.
94class ciReturnAddress : public ciType {
95  CI_PACKAGE_ACCESS
96
97private:
98  // The bci of this return address.
99  int _bci;
100
101  ciReturnAddress(int bci);
102
103  const char* type_string() { return "ciReturnAddress"; }
104
105  void print_impl(outputStream* st);
106
107public:
108  bool is_return_address() const { return true; }
109
110  int  bci() { return _bci; }
111
112  static ciReturnAddress* make(int bci);
113};
114
115#endif // SHARE_VM_CI_CITYPE_HPP
116