1/*
2 * Copyright (c) 2000, 2019, 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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23 */
24
25#ifndef SHARE_CI_CITYPE_HPP
26#define SHARE_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_CI_CITYPE_HPP
116