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
21 * questions.
22 *
27
28 #include "ci/ciClassList.hpp"
29 #include "ci/ciConstant.hpp"
30 #include "ci/ciFlags.hpp"
31 #include "ci/ciInstance.hpp"
32 #include "ci/ciUtilities.hpp"
33
34 // ciField
35 //
36 // This class represents the result of a field lookup in the VM.
37 // The lookup may not succeed, in which case the information in
38 // the ciField will be incomplete.
39 class ciField : public ArenaObj {
40 CI_PACKAGE_ACCESS
41 friend class ciEnv;
42 friend class ciInstanceKlass;
43
44 private:
45 ciFlags _flags;
46 ciInstanceKlass* _holder;
47 ciSymbol* _name;
48 ciSymbol* _signature;
49 ciType* _type;
50 int _offset;
51 bool _is_constant;
52 ciMethod* _known_to_link_with_put;
53 ciInstanceKlass* _known_to_link_with_get;
54 ciConstant _constant_value;
55
56 ciType* compute_type();
57 ciType* compute_type_impl();
58
59 ciField(ciInstanceKlass* klass, int index, Bytecodes::Code bc);
60 ciField(fieldDescriptor* fd);
61
62 // shared constructor code
63 void initialize_from(fieldDescriptor* fd);
64
65 public:
66 ciFlags flags() const { return _flags; }
67
68 // Of which klass is this field a member?
69 //
70 // Usage note: the declared holder of a field is the class
71 // referenced by name in the bytecodes. The canonical holder
72 // is the most general class which holds the field. This
73 // method returns the canonical holder. The declared holder
74 // can be accessed via a method in ciBytecodeStream.
75 //
76 // Ex.
77 // class A {
78 // public int f = 7;
79 // }
80 // class B extends A {
152 // Check for link time errors. Accessing a field from a
153 // certain method via a certain bytecode may or may not be legal.
154 // This call checks to see if an exception may be raised by
155 // an access of this field.
156 //
157 // Usage note: if the same field is accessed multiple times
158 // in the same compilation, will_link will need to be checked
159 // at each point of access.
160 bool will_link(ciMethod* accessing_method,
161 Bytecodes::Code bc);
162
163 // Java access flags
164 bool is_public () const { return flags().is_public(); }
165 bool is_private () const { return flags().is_private(); }
166 bool is_protected () const { return flags().is_protected(); }
167 bool is_static () const { return flags().is_static(); }
168 bool is_final () const { return flags().is_final(); }
169 bool is_stable () const { return flags().is_stable(); }
170 bool is_volatile () const { return flags().is_volatile(); }
171 bool is_transient () const { return flags().is_transient(); }
172 // The field is modified outside of instance initializer methods
173 // (or class/initializer methods if the field is static).
174 bool has_initialized_final_update() const { return flags().has_initialized_final_update(); }
175
176 bool is_call_site_target();
177
178 bool is_autobox_cache();
179
180 // Debugging output
181 void print();
182 void print_name_on(outputStream* st);
183 };
184
185 #endif // SHARE_CI_CIFIELD_HPP
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1 /*
2 * Copyright (c) 1999, 2026, 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 *
27
28 #include "ci/ciClassList.hpp"
29 #include "ci/ciConstant.hpp"
30 #include "ci/ciFlags.hpp"
31 #include "ci/ciInstance.hpp"
32 #include "ci/ciUtilities.hpp"
33
34 // ciField
35 //
36 // This class represents the result of a field lookup in the VM.
37 // The lookup may not succeed, in which case the information in
38 // the ciField will be incomplete.
39 class ciField : public ArenaObj {
40 CI_PACKAGE_ACCESS
41 friend class ciEnv;
42 friend class ciInstanceKlass;
43
44 private:
45 ciFlags _flags;
46 ciInstanceKlass* _holder;
47 ciInstanceKlass* _original_holder; // For fields nested in flat fields
48 ciSymbol* _name;
49 ciSymbol* _signature;
50 ciType* _type;
51 int _offset;
52 bool _is_constant;
53 bool _is_flat;
54 bool _is_null_free;
55 int _null_marker_offset;
56 ciMethod* _known_to_link_with_put;
57 ciInstanceKlass* _known_to_link_with_get;
58 ciConstant _constant_value;
59
60 ciType* compute_type();
61 ciType* compute_type_impl();
62
63 ciField(ciInstanceKlass* klass, int index, Bytecodes::Code bc);
64 ciField(fieldDescriptor* fd);
65 ciField(ciField* declared_field, ciField* sudfield);
66 ciField(ciField* declared_field);
67
68 // shared constructor code
69 void initialize_from(fieldDescriptor* fd);
70
71 public:
72 ciFlags flags() const { return _flags; }
73
74 // Of which klass is this field a member?
75 //
76 // Usage note: the declared holder of a field is the class
77 // referenced by name in the bytecodes. The canonical holder
78 // is the most general class which holds the field. This
79 // method returns the canonical holder. The declared holder
80 // can be accessed via a method in ciBytecodeStream.
81 //
82 // Ex.
83 // class A {
84 // public int f = 7;
85 // }
86 // class B extends A {
158 // Check for link time errors. Accessing a field from a
159 // certain method via a certain bytecode may or may not be legal.
160 // This call checks to see if an exception may be raised by
161 // an access of this field.
162 //
163 // Usage note: if the same field is accessed multiple times
164 // in the same compilation, will_link will need to be checked
165 // at each point of access.
166 bool will_link(ciMethod* accessing_method,
167 Bytecodes::Code bc);
168
169 // Java access flags
170 bool is_public () const { return flags().is_public(); }
171 bool is_private () const { return flags().is_private(); }
172 bool is_protected () const { return flags().is_protected(); }
173 bool is_static () const { return flags().is_static(); }
174 bool is_final () const { return flags().is_final(); }
175 bool is_stable () const { return flags().is_stable(); }
176 bool is_volatile () const { return flags().is_volatile(); }
177 bool is_transient () const { return flags().is_transient(); }
178 bool is_strict () const { return flags().is_strict(); }
179 bool is_flat () const { return _is_flat; }
180 bool is_null_free () const { return _is_null_free; }
181 int null_marker_offset () const { return _null_marker_offset; }
182
183 // The field is modified outside of instance initializer methods
184 // (or class/initializer methods if the field is static).
185 bool has_initialized_final_update() const { return flags().has_initialized_final_update(); }
186
187 bool is_call_site_target();
188
189 bool is_autobox_cache();
190
191 // Debugging output
192 void print() const;
193 void print_name_on(outputStream* st);
194 };
195
196 #endif // SHARE_CI_CIFIELD_HPP
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