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 #include "precompiled.hpp"
26 #include "ci/ciEnv.hpp"
27 #include "ci/ciType.hpp"
28 #include "ci/ciUtilities.inline.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "oops/oop.inline.hpp"
32
33 ciType* ciType::_basic_types[T_CONFLICT+1];
34
35 // ciType
36 //
37 // This class represents either a class (T_OBJECT), array (T_ARRAY),
38 // or one of the primitive types such as T_INT.
39
40 // ------------------------------------------------------------------
41 // ciType::ciType
42 //
43 ciType::ciType(BasicType basic_type) : ciMetadata() {
44 assert(basic_type >= T_BOOLEAN && basic_type <= T_CONFLICT, "range check");
45 _basic_type = basic_type;
46 }
47
48 ciType::ciType(Klass* k) : ciMetadata(k) {
49 _basic_type = k->is_array_klass() ? T_ARRAY : T_OBJECT;
50 }
51
52
53 // ------------------------------------------------------------------
54 // ciType::is_subtype_of
55 //
56 bool ciType::is_subtype_of(ciType* type) {
57 if (this == type) return true;
58 if (is_klass() && type->is_klass())
59 return this->as_klass()->is_subtype_of(type->as_klass());
60 return false;
61 }
62
63 // ------------------------------------------------------------------
64 // ciType::name
65 //
66 // Return the name of this type
67 const char* ciType::name() {
68 if (is_primitive_type()) {
69 return type2name(basic_type());
70 } else {
71 assert(is_klass(), "must be");
72 return as_klass()->name()->as_utf8();
73 }
74 }
75
76 // ------------------------------------------------------------------
77 // ciType::print_impl
78 //
79 // Implementation of the print method.
80 void ciType::print_impl(outputStream* st) {
81 st->print(" type=");
82 print_name_on(st);
83 }
84
85 // ------------------------------------------------------------------
86 // ciType::print_name
87 //
88 // Print the name of this type
89 void ciType::print_name_on(outputStream* st) {
90 ResourceMark rm;
91 st->print("%s", name());
92 }
93
94
95
96 // ------------------------------------------------------------------
97 // ciType::java_mirror
98 //
99 ciInstance* ciType::java_mirror() {
100 VM_ENTRY_MARK;
101 return CURRENT_THREAD_ENV->get_instance(Universe::java_mirror(basic_type()));
102 }
103
104 // ------------------------------------------------------------------
105 // ciType::box_klass
106 //
107 ciKlass* ciType::box_klass() {
108 if (!is_primitive_type()) return this->as_klass(); // reference types are "self boxing"
109
110 // Void is "boxed" with a null.
111 if (basic_type() == T_VOID) return NULL;
112
113 VM_ENTRY_MARK;
114 return CURRENT_THREAD_ENV->get_instance_klass(SystemDictionary::box_klass(basic_type()));
115 }
116
117
118 // ------------------------------------------------------------------
119 // ciType::make
120 //
121 // Produce the ciType for a given primitive BasicType.
122 // As a bonus, produce the right reference type for T_OBJECT.
123 // Does not work on T_ARRAY.
124 ciType* ciType::make(BasicType t) {
125 // short, etc.
126 // Note: Bare T_ADDRESS means a raw pointer type, not a return_address.
127 assert((uint)t < T_CONFLICT+1, "range check");
128 if (t == T_OBJECT) return ciEnv::_Object_klass; // java/lang/Object
129 assert(_basic_types[t] != NULL, "domain check");
130 return _basic_types[t];
131 }
132
133 // ciReturnAddress
134 //
135 // This class represents the type of a specific return address in the
136 // bytecodes.
137
138 // ------------------------------------------------------------------
139 // ciReturnAddress::ciReturnAddress
140 //
141 ciReturnAddress::ciReturnAddress(int bci) : ciType(T_ADDRESS) {
142 assert(0 <= bci, "bci cannot be negative");
143 _bci = bci;
144 }
145
146 // ------------------------------------------------------------------
147 // ciReturnAddress::print_impl
148 //
149 // Implementation of the print method.
150 void ciReturnAddress::print_impl(outputStream* st) {
151 st->print(" bci=%d", _bci);
152 }
153
154 // ------------------------------------------------------------------
155 // ciReturnAddress::make
156 ciReturnAddress* ciReturnAddress::make(int bci) {
157 GUARDED_VM_ENTRY(return CURRENT_ENV->get_return_address(bci);)
158 }