Mercurial > hg > truffle
annotate src/share/vm/ci/ciField.hpp @ 7090:05ce1defa4f9
Common out some parts of UnsafeLoad/Store in UnsafeAccess
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 29 Nov 2012 13:24:08 +0100 |
parents | 957c266d8bc5 |
children | b8f261ba79c6 |
rev | line source |
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0 | 1 /* |
6151 | 2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_CI_CIFIELD_HPP |
26 #define SHARE_VM_CI_CIFIELD_HPP | |
27 | |
28 #include "ci/ciClassList.hpp" | |
29 #include "ci/ciConstant.hpp" | |
30 #include "ci/ciFlags.hpp" | |
31 #include "ci/ciInstance.hpp" | |
32 | |
0 | 33 // ciField |
34 // | |
35 // This class represents the result of a field lookup in the VM. | |
36 // The lookup may not succeed, in which case the information in | |
37 // the ciField will be incomplete. | |
38 class ciField : public ResourceObj { | |
39 CI_PACKAGE_ACCESS | |
40 friend class ciEnv; | |
41 friend class ciInstanceKlass; | |
42 friend class NonStaticFieldFiller; | |
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; | |
6151 | 52 ciInstanceKlass* _known_to_link_with_put; |
53 ciInstanceKlass* _known_to_link_with_get; | |
0 | 54 ciConstant _constant_value; |
55 | |
56 // Used for will_link | |
57 int _cp_index; | |
58 | |
59 ciType* compute_type(); | |
60 ciType* compute_type_impl(); | |
61 | |
62 ciField(ciInstanceKlass* klass, int index); | |
63 ciField(fieldDescriptor* fd); | |
64 | |
65 // shared constructor code | |
66 void initialize_from(fieldDescriptor* fd); | |
67 | |
68 public: | |
69 ciFlags flags() { return _flags; } | |
70 | |
71 // Of which klass is this field a member? | |
72 // | |
73 // Usage note: the declared holder of a field is the class | |
74 // referenced by name in the bytecodes. The canonical holder | |
75 // is the most general class which holds the field. This | |
76 // method returns the canonical holder. The declared holder | |
77 // can be accessed via a method in ciBytecodeStream. | |
78 // | |
79 // Ex. | |
80 // class A { | |
81 // public int f = 7; | |
82 // } | |
83 // class B extends A { | |
84 // public void test() { | |
85 // System.out.println(f); | |
86 // } | |
87 // } | |
88 // | |
89 // A java compiler is permitted to compile the access to | |
90 // field f as: | |
91 // | |
92 // getfield B.f | |
93 // | |
94 // In that case the declared holder of f would be B and | |
95 // the canonical holder of f would be A. | |
96 ciInstanceKlass* holder() { return _holder; } | |
97 | |
98 // Name of this field? | |
99 ciSymbol* name() { return _name; } | |
100 | |
101 // Signature of this field? | |
102 ciSymbol* signature() { return _signature; } | |
103 | |
104 // Of what type is this field? | |
105 ciType* type() { return (_type == NULL) ? compute_type() : _type; } | |
106 | |
107 // How is this field actually stored in memory? | |
108 BasicType layout_type() { return type2field[(_type == NULL) ? T_OBJECT : _type->basic_type()]; } | |
109 | |
110 // How big is this field in memory? | |
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111 int size_in_bytes() { return type2aelembytes(layout_type()); } |
0 | 112 |
113 // What is the offset of this field? | |
114 int offset() { | |
115 assert(_offset >= 1, "illegal call to offset()"); | |
116 return _offset; | |
117 } | |
118 | |
119 // Same question, explicit units. (Fields are aligned to the byte level.) | |
120 int offset_in_bytes() { | |
121 return offset(); | |
122 } | |
123 | |
124 // Is this field shared? | |
125 bool is_shared() { | |
126 // non-static fields of shared holders are cached | |
127 return _holder->is_shared() && !is_static(); | |
128 } | |
129 | |
130 // Is this field a constant? | |
131 // | |
132 // Clarification: A field is considered constant if: | |
133 // 1. The field is both static and final | |
134 // 2. The canonical holder of the field has undergone | |
135 // static initialization. | |
136 // 3. If the field is an object or array, then the oop | |
137 // in question is allocated in perm space. | |
138 // 4. The field is not one of the special static/final | |
139 // non-constant fields. These are java.lang.System.in | |
140 // and java.lang.System.out. Abomination. | |
141 // | |
142 // Note: the check for case 4 is not yet implemented. | |
143 bool is_constant() { return _is_constant; } | |
144 | |
145 // Get the constant value of this field. | |
146 ciConstant constant_value() { | |
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147 assert(is_static() && is_constant(), "illegal call to constant_value()"); |
0 | 148 return _constant_value; |
149 } | |
150 | |
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151 // Get the constant value of non-static final field in the given |
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152 // object. |
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153 ciConstant constant_value_of(ciObject* object) { |
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154 assert(!is_static() && is_constant(), "only if field is non-static constant"); |
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155 assert(object->is_instance(), "must be instance"); |
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156 return object->as_instance()->field_value(this); |
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157 } |
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158 |
0 | 159 // Check for link time errors. Accessing a field from a |
160 // certain class via a certain bytecode may or may not be legal. | |
161 // This call checks to see if an exception may be raised by | |
162 // an access of this field. | |
163 // | |
164 // Usage note: if the same field is accessed multiple times | |
165 // in the same compilation, will_link will need to be checked | |
166 // at each point of access. | |
167 bool will_link(ciInstanceKlass* accessing_klass, | |
168 Bytecodes::Code bc); | |
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169 bool will_link_from_vm(ciInstanceKlass* accessing_klass, |
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170 Bytecodes::Code bc); |
0 | 171 |
172 // Java access flags | |
173 bool is_public () { return flags().is_public(); } | |
174 bool is_private () { return flags().is_private(); } | |
175 bool is_protected () { return flags().is_protected(); } | |
176 bool is_static () { return flags().is_static(); } | |
177 bool is_final () { return flags().is_final(); } | |
178 bool is_volatile () { return flags().is_volatile(); } | |
179 bool is_transient () { return flags().is_transient(); } | |
180 | |
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181 bool is_call_site_target() { |
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182 ciInstanceKlass* callsite_klass = CURRENT_ENV->CallSite_klass(); |
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183 if (callsite_klass == NULL) |
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184 return false; |
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185 return (holder()->is_subclass_of(callsite_klass) && (name() == ciSymbol::target_name())); |
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186 } |
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187 |
0 | 188 // Debugging output |
189 void print(); | |
190 void print_name_on(outputStream* st); | |
191 }; | |
1972 | 192 |
193 #endif // SHARE_VM_CI_CIFIELD_HPP |