Mercurial > hg > truffle
annotate src/share/vm/ci/ciField.hpp @ 12190:edb5ab0f3fe5
8001107: @Stable annotation for constant folding of lazily evaluated variables
Reviewed-by: rbackman, twisti, kvn
Contributed-by: john.r.rose@oracle.com, vladimir.x.ivanov@oracle.com
| author | vlivanov |
|---|---|
| date | Tue, 10 Sep 2013 14:51:48 -0700 |
| parents | e778c29768e6 |
| children | b2e698d2276c |
| rev | line source |
|---|---|
| 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1138
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1138
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1138
diff
changeset
|
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? | |
|
29
d5fc211aea19
6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM
kvn
parents:
0
diff
changeset
|
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 // | |
|
12190
edb5ab0f3fe5
8001107: @Stable annotation for constant folding of lazily evaluated variables
vlivanov
parents:
6151
diff
changeset
|
142 // A field is also considered constant if it is marked @Stable |
|
edb5ab0f3fe5
8001107: @Stable annotation for constant folding of lazily evaluated variables
vlivanov
parents:
6151
diff
changeset
|
143 // and is non-null (or non-zero, if a primitive). |
|
edb5ab0f3fe5
8001107: @Stable annotation for constant folding of lazily evaluated variables
vlivanov
parents:
6151
diff
changeset
|
144 // For non-static fields, the null/zero check must be |
|
edb5ab0f3fe5
8001107: @Stable annotation for constant folding of lazily evaluated variables
vlivanov
parents:
6151
diff
changeset
|
145 // arranged by the user, as constant_value().is_null_or_zero(). |
| 0 | 146 bool is_constant() { return _is_constant; } |
| 147 | |
| 148 // Get the constant value of this field. | |
| 149 ciConstant constant_value() { | |
|
1138
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
196
diff
changeset
|
150 assert(is_static() && is_constant(), "illegal call to constant_value()"); |
| 0 | 151 return _constant_value; |
| 152 } | |
| 153 | |
|
1138
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
196
diff
changeset
|
154 // Get the constant value of non-static final field in the given |
|
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
196
diff
changeset
|
155 // object. |
|
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
196
diff
changeset
|
156 ciConstant constant_value_of(ciObject* object) { |
|
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
196
diff
changeset
|
157 assert(!is_static() && is_constant(), "only if field is non-static constant"); |
|
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
196
diff
changeset
|
158 assert(object->is_instance(), "must be instance"); |
|
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
196
diff
changeset
|
159 return object->as_instance()->field_value(this); |
|
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
196
diff
changeset
|
160 } |
|
dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
twisti
parents:
196
diff
changeset
|
161 |
| 0 | 162 // Check for link time errors. Accessing a field from a |
| 163 // certain class via a certain bytecode may or may not be legal. | |
| 164 // This call checks to see if an exception may be raised by | |
| 165 // an access of this field. | |
| 166 // | |
| 167 // Usage note: if the same field is accessed multiple times | |
| 168 // in the same compilation, will_link will need to be checked | |
| 169 // at each point of access. | |
| 170 bool will_link(ciInstanceKlass* accessing_klass, | |
| 171 Bytecodes::Code bc); | |
| 172 | |
| 173 // Java access flags | |
| 174 bool is_public () { return flags().is_public(); } | |
| 175 bool is_private () { return flags().is_private(); } | |
| 176 bool is_protected () { return flags().is_protected(); } | |
| 177 bool is_static () { return flags().is_static(); } | |
| 178 bool is_final () { return flags().is_final(); } | |
|
12190
edb5ab0f3fe5
8001107: @Stable annotation for constant folding of lazily evaluated variables
vlivanov
parents:
6151
diff
changeset
|
179 bool is_stable () { return flags().is_stable(); } |
| 0 | 180 bool is_volatile () { return flags().is_volatile(); } |
| 181 bool is_transient () { return flags().is_transient(); } | |
| 182 | |
|
3901
aa67216400d3
7085404: JSR 292: VolatileCallSites should have push notification too
twisti
parents:
3899
diff
changeset
|
183 bool is_call_site_target() { |
|
3907
7b5c767f229c
7086560: 7085404 changes broke VM with -XX:-EnableInvokeDynamic
kvn
parents:
3901
diff
changeset
|
184 ciInstanceKlass* callsite_klass = CURRENT_ENV->CallSite_klass(); |
|
7b5c767f229c
7086560: 7085404 changes broke VM with -XX:-EnableInvokeDynamic
kvn
parents:
3901
diff
changeset
|
185 if (callsite_klass == NULL) |
|
7b5c767f229c
7086560: 7085404 changes broke VM with -XX:-EnableInvokeDynamic
kvn
parents:
3901
diff
changeset
|
186 return false; |
|
7b5c767f229c
7086560: 7085404 changes broke VM with -XX:-EnableInvokeDynamic
kvn
parents:
3901
diff
changeset
|
187 return (holder()->is_subclass_of(callsite_klass) && (name() == ciSymbol::target_name())); |
|
3901
aa67216400d3
7085404: JSR 292: VolatileCallSites should have push notification too
twisti
parents:
3899
diff
changeset
|
188 } |
|
3852
fdb992d83a87
7071653: JSR 292: call site change notification should be pushed not pulled
twisti
parents:
1972
diff
changeset
|
189 |
| 0 | 190 // Debugging output |
| 191 void print(); | |
| 192 void print_name_on(outputStream* st); | |
| 193 }; | |
| 1972 | 194 |
| 195 #endif // SHARE_VM_CI_CIFIELD_HPP |