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
21 * questions.
22 *
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 a Java reference, inline type or primitive type.
33
34 class ciType : public ciMetadata {
35 CI_PACKAGE_ACCESS
36 friend class ciKlass;
37 friend class ciReturnAddress;
38 friend class ciWrapper;
39
40 private:
41 BasicType _basic_type;
42
43 ciType(BasicType t); // for primitive and unloaded types
44 ciType(Klass* k); // for subclasses (reference types)
45
46 const char* type_string() { return "ciType"; }
47
48 void print_impl(outputStream* st);
49
50 // Distinguished instances of primitive ciTypes..
51 static ciType* _basic_types[T_CONFLICT+1];
52
53 public:
54 BasicType basic_type() const { return _basic_type; }
55
56 // Returns true iff the types are identical, or if both are klasses
57 // and the is_subtype_of relation holds between the klasses.
58 bool is_subtype_of(ciType* type);
59
60 // Get the instance of java.lang.Class corresponding to this type.
61 // There are mirrors for instance, array, and primitive types (incl. void).
62 virtual ciInstance* java_mirror();
63
64 // Returns true if this is not a klass or array (i.e., not a reference type).
65 bool is_primitive_type() const { return !is_reference_type(basic_type()); }
66 int size() const { return type2size[basic_type()]; }
67 bool is_void() const { return basic_type() == T_VOID; }
68 bool is_one_word() const { return size() == 1; }
69 bool is_two_word() const { return size() == 2; }
70
71 // What kind of ciObject is this?
72 bool is_type() const { return true; }
73 bool is_classless() const { return is_primitive_type(); }
74
75 virtual ciType* unwrap() { return this; }
76 virtual bool is_null_free() const { return false; }
77
78 const char* name();
79 virtual void print_name_on(outputStream* st);
80 void print_name() {
81 print_name_on(tty);
82 }
83
84 static ciType* make(BasicType t);
85 };
86
87
88 // ciReturnAddress
89 //
90 // This class represents the type of a specific return address in the
91 // bytecodes.
92 class ciReturnAddress : public ciType {
93 CI_PACKAGE_ACCESS
94
95 private:
96 // The bci of this return address.
97 int _bci;
98
99 ciReturnAddress(int bci);
100
101 const char* type_string() { return "ciReturnAddress"; }
102
103 void print_impl(outputStream* st);
104
105 public:
106 bool is_return_address() const { return true; }
107
108 int bci() { return _bci; }
109
110 static ciReturnAddress* make(int bci);
111 };
112
113 // ciWrapper
114 //
115 // This class wraps another type to carry additional information.
116 // Currently it is only used to mark inline klasses as null-free.
117 class ciWrapper : public ciType {
118 CI_PACKAGE_ACCESS
119
120 private:
121 ciType* _type;
122
123 ciWrapper(ciType* type) : ciType(type->basic_type()) {
124 assert(type->is_inlinetype()
125 // An unloaded inline type is an instance_klass (see ciEnv::get_klass_by_name_impl())
126 || (type->is_instance_klass() && !type->is_loaded()),
127 "should only be used for inline types");
128 _type = type;
129 }
130
131 const char* type_string() { return "ciWrapper"; }
132
133 void print_impl(outputStream* st) { _type->print_impl(st); }
134
135 public:
136 bool is_wrapper() const { return true; }
137 ciType* unwrap() { return _type; }
138 bool is_null_free() const { return true; }
139 };
140
141 #endif // SHARE_CI_CITYPE_HPP