49 // This class represents the field information contained in the fields
50 // array of an InstanceKlass. Currently it's laid on top an array of
51 // Java shorts but in the future it could simply be used as a real
52 // array type. FieldInfo generally shouldn't be used directly.
53 // Fields should be queried either through InstanceKlass or through
54 // the various FieldStreams.
55 class FieldInfo {
56 friend class fieldDescriptor;
57 friend class JavaFieldStream;
58 friend class ClassFileParser;
59 friend class FieldInfoStream;
60 friend class FieldStreamBase;
61 friend class FieldInfoReader;
62 friend class VMStructs;
63
64 public:
65
66 class FieldFlags {
67 friend class VMStructs;
68 friend class JVMCIVMStructs;
69
70 // The ordering of this enum is totally internal. More frequent
71 // flags should come earlier than less frequent ones, because
72 // earlier ones compress better.
73 enum FieldFlagBitPosition {
74 _ff_initialized, // has ConstantValue initializer attribute
75 _ff_injected, // internal field injected by the JVM
76 _ff_generic, // has a generic signature
77 _ff_stable, // trust as stable b/c declared as @Stable
78 _ff_contended, // is contended, may have contention-group
79 };
80
81 // Some but not all of the flag bits signal the presence of an
82 // additional 32-bit item in the field record.
83 static const u4 _optional_item_bit_mask =
84 flag_mask((int)_ff_initialized) |
85 flag_mask((int)_ff_generic) |
86 flag_mask((int)_ff_contended);
87
88 // boilerplate:
89 u4 _flags;
90
91 bool test_flag(FieldFlagBitPosition pos) const {
92 return (_flags & flag_mask(pos)) != 0;
93 }
94 void update_flag(FieldFlagBitPosition pos, bool z) {
95 if (z) _flags |= flag_mask(pos);
96 else _flags &= ~flag_mask(pos);
97 }
98
99 public:
100 FieldFlags(u4 flags) {
101 _flags = flags;
102 }
103 u4 as_uint() const { return _flags; }
104 bool has_any_optionals() const {
105 return (_flags & _optional_item_bit_mask) != 0;
106 }
107
108 bool is_initialized() const { return test_flag(_ff_initialized); }
109 bool is_injected() const { return test_flag(_ff_injected); }
110 bool is_generic() const { return test_flag(_ff_generic); }
111 bool is_stable() const { return test_flag(_ff_stable); }
112 bool is_contended() const { return test_flag(_ff_contended); }
113
114 void update_initialized(bool z) { update_flag(_ff_initialized, z); }
115 void update_injected(bool z) { update_flag(_ff_injected, z); }
116 void update_generic(bool z) { update_flag(_ff_generic, z); }
117 void update_stable(bool z) { update_flag(_ff_stable, z); }
118 void update_contended(bool z) { update_flag(_ff_contended, z); }
119 };
120
121 private:
122 // The following items are the unpacked bitwise information content
123 // of a field record. Per-field metadata extracted from the class
124 // file are stored logically as a group of these items. The
125 // classfile parser produces these records in a temporary array, and
126 // then compresses them into a FieldInfoStream.
127 //
128 u4 _index; // which field it is
129 u2 _name_index; // index in CP of name
130 u2 _signature_index; // index in CP of descriptor
131 u4 _offset; // offset in object layout
132 AccessFlags _access_flags; // access flags (JVM spec)
133 FieldFlags _field_flags; // VM defined flags (not JVM spec)
134 u2 _initializer_index; // index from ConstantValue attr (or 0)
135 u2 _generic_signature_index; // index from GenericSignature attr (or 0)
136 u2 _contention_group; // index from @Contended group item (or 0)
137
138 public:
139
140 FieldInfo() : _name_index(0),
141 _signature_index(0),
142 _offset(0),
143 _access_flags(AccessFlags(0)),
144 _field_flags(FieldFlags(0)),
145 _initializer_index(0),
146 _generic_signature_index(0),
147 _contention_group(0) { }
148
149 FieldInfo(AccessFlags access_flags, u2 name_index, u2 signature_index, u2 initval_index, FieldInfo::FieldFlags fflags) :
150 _name_index(name_index),
151 _signature_index(signature_index),
152 _offset(0),
153 _access_flags(access_flags),
154 _field_flags(fflags),
155 _initializer_index(initval_index),
156 _generic_signature_index(0),
157 _contention_group(0) {
158 if (initval_index != 0) {
159 _field_flags.update_initialized(true);
160 }
161 }
162
163 u4 index() const { return _index; }
164 void set_index(u4 index) { _index = index; }
165 u2 name_index() const { return _name_index; }
166 void set_name_index(u2 index) { _name_index = index; }
167 u2 signature_index() const { return _signature_index; }
168 void set_signature_index(u2 index) { _signature_index = index; }
169 u4 offset() const { return _offset; }
170 void set_offset(u4 offset) { _offset = offset; }
171 AccessFlags access_flags() const { return _access_flags; }
172 FieldFlags field_flags() const { return _field_flags; }
173 FieldFlags* field_flags_addr() { return &_field_flags; }
174 u2 initializer_index() const { return _initializer_index; }
175 void set_initializer_index(u2 index) { _initializer_index = index; }
176 u2 generic_signature_index() const { return _generic_signature_index; }
177 void set_generic_signature_index(u2 index) { _generic_signature_index = index; }
178 u2 contention_group() const { return _contention_group; }
179
180 bool is_contended() const {
181 return _field_flags.is_contended();
182 }
183
184 u2 contended_group() const {
185 assert(is_contended(), "");
186 return _contention_group;
187 }
188
189 void set_contended_group(u2 group) {
190 _field_flags.update_contended(true);
191 _contention_group = group;
192 }
193
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49 // This class represents the field information contained in the fields
50 // array of an InstanceKlass. Currently it's laid on top an array of
51 // Java shorts but in the future it could simply be used as a real
52 // array type. FieldInfo generally shouldn't be used directly.
53 // Fields should be queried either through InstanceKlass or through
54 // the various FieldStreams.
55 class FieldInfo {
56 friend class fieldDescriptor;
57 friend class JavaFieldStream;
58 friend class ClassFileParser;
59 friend class FieldInfoStream;
60 friend class FieldStreamBase;
61 friend class FieldInfoReader;
62 friend class VMStructs;
63
64 public:
65
66 class FieldFlags {
67 friend class VMStructs;
68 friend class JVMCIVMStructs;
69 friend class FieldDesc;
70
71 // The ordering of this enum is totally internal. More frequent
72 // flags should come earlier than less frequent ones, because
73 // earlier ones compress better.
74 enum FieldFlagBitPosition {
75 _ff_null_free_inline_type, // field's type is an inline type and the field is null free
76 _ff_flat, // field is a flat field
77 _ff_initialized, // has ConstantValue initializer attribute
78 _ff_injected, // internal field injected by the JVM
79 _ff_generic, // has a generic signature
80 _ff_stable, // trust as stable b/c declared as @Stable
81 _ff_contended, // is contended, may have contention-group
82 _ff_null_marker, // field has a null marker, optional section include the null marker offset
83 _ff_internal_null_marker // null marker is internal (inside the layout of a flat field)
84 };
85
86 // Some but not all of the flag bits signal the presence of an
87 // additional 32-bit item in the field record.
88 static const u4 _optional_item_bit_mask =
89 flag_mask((int)_ff_initialized) |
90 flag_mask((int)_ff_generic) |
91 flag_mask((int)_ff_contended) |
92 flag_mask((int)_ff_null_marker);
93
94 // boilerplate:
95 u4 _flags;
96
97 bool test_flag(FieldFlagBitPosition pos) const {
98 return (_flags & flag_mask(pos)) != 0;
99 }
100 void update_flag(FieldFlagBitPosition pos, bool z) {
101 if (z) _flags |= flag_mask(pos);
102 else _flags &= ~flag_mask(pos);
103 }
104
105 public:
106 FieldFlags(u4 flags) {
107 _flags = flags;
108 }
109 u4 as_uint() const { return _flags; }
110 bool has_any_optionals() const {
111 return (_flags & _optional_item_bit_mask) != 0;
112 }
113
114 bool is_initialized() const { return test_flag(_ff_initialized); }
115 bool is_null_free_inline_type() const { return test_flag(_ff_null_free_inline_type); }
116 bool is_flat() const { return test_flag(_ff_flat); }
117 bool is_injected() const { return test_flag(_ff_injected); }
118 bool is_generic() const { return test_flag(_ff_generic); }
119 bool is_stable() const { return test_flag(_ff_stable); }
120 bool is_contended() const { return test_flag(_ff_contended); }
121 bool has_null_marker() const { return test_flag(_ff_null_marker); }
122 bool is_null_marker_internal() const {return test_flag(_ff_internal_null_marker); }
123
124 void update_initialized(bool z) { update_flag(_ff_initialized, z); }
125 void update_null_free_inline_type(bool z) { update_flag(_ff_null_free_inline_type, z); }
126 void update_flat(bool z) { update_flag(_ff_flat, z); }
127 void update_injected(bool z) { update_flag(_ff_injected, z); }
128 void update_generic(bool z) { update_flag(_ff_generic, z); }
129 void update_stable(bool z) { update_flag(_ff_stable, z); }
130 void update_contended(bool z) { update_flag(_ff_contended, z); }
131 void update_null_marker(bool z) { update_flag(_ff_null_marker, z); }
132 void update_internal_null_marker(bool z) { update_flag(_ff_internal_null_marker, z); }
133 };
134
135 private:
136 // The following items are the unpacked bitwise information content
137 // of a field record. Per-field metadata extracted from the class
138 // file are stored logically as a group of these items. The
139 // classfile parser produces these records in a temporary array, and
140 // then compresses them into a FieldInfoStream.
141 //
142 u4 _index; // which field it is
143 u2 _name_index; // index in CP of name
144 u2 _signature_index; // index in CP of descriptor
145 u4 _offset; // offset in object layout
146 AccessFlags _access_flags; // access flags (JVM spec)
147 FieldFlags _field_flags; // VM defined flags (not JVM spec)
148 u4 _null_marker_offset; // null marker offset for this field in the object layout
149 u2 _initializer_index; // index from ConstantValue attr (or 0)
150 u2 _generic_signature_index; // index from GenericSignature attr (or 0)
151 u2 _contention_group; // index from @Contended group item (or 0)
152
153 public:
154
155 FieldInfo() : _name_index(0),
156 _signature_index(0),
157 _offset(0),
158 _access_flags(AccessFlags(0)),
159 _field_flags(FieldFlags(0)),
160 _null_marker_offset(0),
161 _initializer_index(0),
162 _generic_signature_index(0),
163 _contention_group(0) { }
164
165 FieldInfo(AccessFlags access_flags, u2 name_index, u2 signature_index, u2 initval_index, FieldInfo::FieldFlags fflags) :
166 _name_index(name_index),
167 _signature_index(signature_index),
168 _offset(0),
169 _access_flags(access_flags),
170 _field_flags(fflags),
171 _null_marker_offset(0),
172 _initializer_index(initval_index),
173 _generic_signature_index(0),
174 _contention_group(0) {
175 if (initval_index != 0) {
176 _field_flags.update_initialized(true);
177 }
178 }
179
180 u4 index() const { return _index; }
181 void set_index(u4 index) { _index = index; }
182 u2 name_index() const { return _name_index; }
183 void set_name_index(u2 index) { _name_index = index; }
184 u2 signature_index() const { return _signature_index; }
185 void set_signature_index(u2 index) { _signature_index = index; }
186 u4 offset() const { return _offset; }
187 void set_offset(u4 offset) { _offset = offset; }
188 AccessFlags access_flags() const { return _access_flags; }
189 FieldFlags field_flags() const { return _field_flags; }
190 FieldFlags* field_flags_addr() { return &_field_flags; }
191 u4 null_marker_offset() const { return _null_marker_offset; }
192 void set_null_marker_offset(u4 offset) { _null_marker_offset = offset; }
193 u2 initializer_index() const { return _initializer_index; }
194 void set_initializer_index(u2 index) { _initializer_index = index; }
195 u2 generic_signature_index() const { return _generic_signature_index; }
196 void set_generic_signature_index(u2 index) { _generic_signature_index = index; }
197 u2 contention_group() const { return _contention_group; }
198
199 bool is_contended() const {
200 return _field_flags.is_contended();
201 }
202
203 u2 contended_group() const {
204 assert(is_contended(), "");
205 return _contention_group;
206 }
207
208 void set_contended_group(u2 group) {
209 _field_flags.update_contended(true);
210 _contention_group = group;
211 }
212
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