Mercurial > hg > truffle
annotate src/share/vm/ci/ciField.hpp @ 14517:3812c088b945
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author | lana |
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2013, 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 ciType* compute_type(); | |
57 ciType* compute_type_impl(); | |
58 | |
59 ciField(ciInstanceKlass* klass, int index); | |
60 ciField(fieldDescriptor* fd); | |
61 | |
62 // shared constructor code | |
63 void initialize_from(fieldDescriptor* fd); | |
64 | |
65 public: | |
66 ciFlags flags() { 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 { | |
81 // public void test() { | |
82 // System.out.println(f); | |
83 // } | |
84 // } | |
85 // | |
86 // A java compiler is permitted to compile the access to | |
87 // field f as: | |
88 // | |
89 // getfield B.f | |
90 // | |
91 // In that case the declared holder of f would be B and | |
92 // the canonical holder of f would be A. | |
93 ciInstanceKlass* holder() { return _holder; } | |
94 | |
95 // Name of this field? | |
96 ciSymbol* name() { return _name; } | |
97 | |
98 // Signature of this field? | |
99 ciSymbol* signature() { return _signature; } | |
100 | |
101 // Of what type is this field? | |
102 ciType* type() { return (_type == NULL) ? compute_type() : _type; } | |
103 | |
104 // How is this field actually stored in memory? | |
105 BasicType layout_type() { return type2field[(_type == NULL) ? T_OBJECT : _type->basic_type()]; } | |
106 | |
107 // How big is this field in memory? | |
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108 int size_in_bytes() { return type2aelembytes(layout_type()); } |
0 | 109 |
110 // What is the offset of this field? | |
111 int offset() { | |
112 assert(_offset >= 1, "illegal call to offset()"); | |
113 return _offset; | |
114 } | |
115 | |
116 // Same question, explicit units. (Fields are aligned to the byte level.) | |
117 int offset_in_bytes() { | |
118 return offset(); | |
119 } | |
120 | |
121 // Is this field shared? | |
122 bool is_shared() { | |
123 // non-static fields of shared holders are cached | |
124 return _holder->is_shared() && !is_static(); | |
125 } | |
126 | |
127 // Is this field a constant? | |
128 // | |
129 // Clarification: A field is considered constant if: | |
130 // 1. The field is both static and final | |
131 // 2. The canonical holder of the field has undergone | |
132 // static initialization. | |
14309 | 133 // 3. The field is not one of the special static/final |
0 | 134 // non-constant fields. These are java.lang.System.in |
135 // and java.lang.System.out. Abomination. | |
136 // | |
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137 // A field is also considered constant if it is marked @Stable |
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138 // and is non-null (or non-zero, if a primitive). |
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139 // For non-static fields, the null/zero check must be |
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140 // arranged by the user, as constant_value().is_null_or_zero(). |
0 | 141 bool is_constant() { return _is_constant; } |
142 | |
143 // Get the constant value of this field. | |
144 ciConstant constant_value() { | |
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145 assert(is_static() && is_constant(), "illegal call to constant_value()"); |
0 | 146 return _constant_value; |
147 } | |
148 | |
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149 // Get the constant value of non-static final field in the given |
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150 // object. |
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151 ciConstant constant_value_of(ciObject* object) { |
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152 assert(!is_static() && is_constant(), "only if field is non-static constant"); |
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153 assert(object->is_instance(), "must be instance"); |
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154 return object->as_instance()->field_value(this); |
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155 } |
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156 |
0 | 157 // Check for link time errors. Accessing a field from a |
158 // certain class via a certain bytecode may or may not be legal. | |
159 // This call checks to see if an exception may be raised by | |
160 // an access of this field. | |
161 // | |
162 // Usage note: if the same field is accessed multiple times | |
163 // in the same compilation, will_link will need to be checked | |
164 // at each point of access. | |
165 bool will_link(ciInstanceKlass* accessing_klass, | |
166 Bytecodes::Code bc); | |
167 | |
168 // Java access flags | |
169 bool is_public () { return flags().is_public(); } | |
170 bool is_private () { return flags().is_private(); } | |
171 bool is_protected () { return flags().is_protected(); } | |
172 bool is_static () { return flags().is_static(); } | |
173 bool is_final () { return flags().is_final(); } | |
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174 bool is_stable () { return flags().is_stable(); } |
0 | 175 bool is_volatile () { return flags().is_volatile(); } |
176 bool is_transient () { return flags().is_transient(); } | |
177 | |
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178 bool is_call_site_target() { |
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179 ciInstanceKlass* callsite_klass = CURRENT_ENV->CallSite_klass(); |
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180 if (callsite_klass == NULL) |
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181 return false; |
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182 return (holder()->is_subclass_of(callsite_klass) && (name() == ciSymbol::target_name())); |
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183 } |
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184 |
0 | 185 // Debugging output |
186 void print(); | |
187 void print_name_on(outputStream* st); | |
188 }; | |
1972 | 189 |
190 #endif // SHARE_VM_CI_CIFIELD_HPP |