37 case ITEM_Float: return float_type();
38 case ITEM_Double: return double_type();
39 case ITEM_Long: return long_type();
40 case ITEM_Null: return null_type();
41 default:
42 ShouldNotReachHere();
43 return bogus_type();
44 }
45 }
46
47 bool VerificationType::resolve_and_check_assignability(InstanceKlass* klass, Symbol* name,
48 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) {
49 HandleMark hm(THREAD);
50 Klass* this_class = SystemDictionary::resolve_or_fail(
51 name, Handle(THREAD, klass->class_loader()),
52 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
53 if (log_is_enabled(Debug, class, resolve)) {
54 Verifier::trace_class_resolution(this_class, klass);
55 }
56
57 if (this_class->is_interface() && (!from_field_is_protected ||
58 from_name != vmSymbols::java_lang_Object())) {
59 // If we are not trying to access a protected field or method in
60 // java.lang.Object then, for arrays, we only allow assignability
61 // to interfaces java.lang.Cloneable and java.io.Serializable.
62 // Otherwise, we treat interfaces as java.lang.Object.
63 return !from_is_array ||
64 this_class == SystemDictionary::Cloneable_klass() ||
65 this_class == SystemDictionary::Serializable_klass();
66 } else if (from_is_object) {
67 Klass* from_class = SystemDictionary::resolve_or_fail(
68 from_name, Handle(THREAD, klass->class_loader()),
69 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
70 if (log_is_enabled(Debug, class, resolve)) {
71 Verifier::trace_class_resolution(from_class, klass);
72 }
73 return InstanceKlass::cast(from_class)->is_subclass_of(this_class);
74 }
75
76 return false;
92 if (name() == vmSymbols::java_lang_Object()) {
93 // any object or array is assignable to java.lang.Object
94 return true;
95 }
96
97 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
98 if (SystemDictionaryShared::add_verification_constraint(klass,
99 name(), from.name(), from_field_is_protected, from.is_array(),
100 from.is_object())) {
101 // If add_verification_constraint() returns true, the resolution/check should be
102 // delayed until runtime.
103 return true;
104 }
105 }
106
107 return resolve_and_check_assignability(klass, name(), from.name(),
108 from_field_is_protected, from.is_array(), from.is_object(), THREAD);
109 } else if (is_array() && from.is_array()) {
110 VerificationType comp_this = get_component(context, CHECK_false);
111 VerificationType comp_from = from.get_component(context, CHECK_false);
112 if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
113 return comp_this.is_component_assignable_from(comp_from, context,
114 from_field_is_protected, THREAD);
115 }
116 }
117 return false;
118 }
119
120 VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const {
121 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
122 Symbol* component;
123 switch (name()->char_at(1)) {
124 case 'Z': return VerificationType(Boolean);
125 case 'B': return VerificationType(Byte);
126 case 'C': return VerificationType(Char);
127 case 'S': return VerificationType(Short);
128 case 'I': return VerificationType(Integer);
129 case 'J': return VerificationType(Long);
130 case 'F': return VerificationType(Float);
131 case 'D': return VerificationType(Double);
132 case '[':
133 component = context->create_temporary_symbol(
134 name(), 1, name()->utf8_length());
135 return VerificationType::reference_type(component);
136 case 'L':
137 component = context->create_temporary_symbol(
138 name(), 2, name()->utf8_length() - 1);
139 return VerificationType::reference_type(component);
140 default:
141 // Met an invalid type signature, e.g. [X
142 return VerificationType::bogus_type();
143 }
144 }
145
146 void VerificationType::print_on(outputStream* st) const {
147 switch (_u._data) {
148 case Bogus: st->print("top"); break;
149 case Category1: st->print("category1"); break;
150 case Category2: st->print("category2"); break;
151 case Category2_2nd: st->print("category2_2nd"); break;
152 case Boolean: st->print("boolean"); break;
153 case Byte: st->print("byte"); break;
154 case Short: st->print("short"); break;
155 case Char: st->print("char"); break;
156 case Integer: st->print("integer"); break;
157 case Float: st->print("float"); break;
158 case Long: st->print("long"); break;
159 case Double: st->print("double"); break;
160 case Long_2nd: st->print("long_2nd"); break;
161 case Double_2nd: st->print("double_2nd"); break;
162 case Null: st->print("null"); break;
163 case ReferenceQuery: st->print("reference type"); break;
164 case Category1Query: st->print("category1 type"); break;
165 case Category2Query: st->print("category2 type"); break;
166 case Category2_2ndQuery: st->print("category2_2nd type"); break;
167 default:
168 if (is_uninitialized_this()) {
169 st->print("uninitializedThis");
170 } else if (is_uninitialized()) {
171 st->print("uninitialized %d", bci());
172 } else {
173 if (name() != NULL) {
174 name()->print_value_on(st);
175 } else {
176 st->print_cr("NULL");
177 }
178 }
179 }
180 }
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37 case ITEM_Float: return float_type();
38 case ITEM_Double: return double_type();
39 case ITEM_Long: return long_type();
40 case ITEM_Null: return null_type();
41 default:
42 ShouldNotReachHere();
43 return bogus_type();
44 }
45 }
46
47 bool VerificationType::resolve_and_check_assignability(InstanceKlass* klass, Symbol* name,
48 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) {
49 HandleMark hm(THREAD);
50 Klass* this_class = SystemDictionary::resolve_or_fail(
51 name, Handle(THREAD, klass->class_loader()),
52 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
53 if (log_is_enabled(Debug, class, resolve)) {
54 Verifier::trace_class_resolution(this_class, klass);
55 }
56
57 if (this_class->access_flags().is_value_type()) return false;
58 if (this_class->is_interface() && (!from_field_is_protected ||
59 from_name != vmSymbols::java_lang_Object())) {
60 // If we are not trying to access a protected field or method in
61 // java.lang.Object then, for arrays, we only allow assignability
62 // to interfaces java.lang.Cloneable and java.io.Serializable.
63 // Otherwise, we treat interfaces as java.lang.Object.
64 return !from_is_array ||
65 this_class == SystemDictionary::Cloneable_klass() ||
66 this_class == SystemDictionary::Serializable_klass();
67 } else if (from_is_object) {
68 Klass* from_class = SystemDictionary::resolve_or_fail(
69 from_name, Handle(THREAD, klass->class_loader()),
70 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
71 if (log_is_enabled(Debug, class, resolve)) {
72 Verifier::trace_class_resolution(from_class, klass);
73 }
74 return InstanceKlass::cast(from_class)->is_subclass_of(this_class);
75 }
76
77 return false;
93 if (name() == vmSymbols::java_lang_Object()) {
94 // any object or array is assignable to java.lang.Object
95 return true;
96 }
97
98 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
99 if (SystemDictionaryShared::add_verification_constraint(klass,
100 name(), from.name(), from_field_is_protected, from.is_array(),
101 from.is_object())) {
102 // If add_verification_constraint() returns true, the resolution/check should be
103 // delayed until runtime.
104 return true;
105 }
106 }
107
108 return resolve_and_check_assignability(klass, name(), from.name(),
109 from_field_is_protected, from.is_array(), from.is_object(), THREAD);
110 } else if (is_array() && from.is_array()) {
111 VerificationType comp_this = get_component(context, CHECK_false);
112 VerificationType comp_from = from.get_component(context, CHECK_false);
113
114 /*
115 // This code implements non-covariance between value type arrays and both
116 // arrays of objects and arrays of interface types. If covariance is
117 // supported for value type arrays then this code should be removed.
118 if (comp_from.is_valuetype() && !comp_this.is_null() && comp_this.is_reference()) {
119 // An array of value types is not assignable to an array of java.lang.Objects.
120 if (comp_this.name() == vmSymbols::java_lang_Object()) {
121 return false;
122 }
123
124 // Need to load 'comp_this' to see if it is an interface.
125 InstanceKlass* klass = context->current_class();
126 {
127 HandleMark hm(THREAD);
128 Klass* comp_this_class = SystemDictionary::resolve_or_fail(
129 comp_this.name(), Handle(THREAD, klass->class_loader()),
130 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
131 klass->class_loader_data()->record_dependency(comp_this_class);
132 if (log_is_enabled(Debug, class, resolve)) {
133 Verifier::trace_class_resolution(comp_this_class, klass);
134 }
135 // An array of value types is not assignable to an array of interface types.
136 if (comp_this_class->is_interface()) {
137 return false;
138 }
139 }
140 }
141 */
142 if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
143 return comp_this.is_component_assignable_from(comp_from, context,
144 from_field_is_protected, THREAD);
145 }
146 }
147 return false;
148 }
149
150 bool VerificationType::is_valuetype_assignable_from(const VerificationType& from) const {
151 // Check that 'from' is not null, is a value type, and is the same value type.
152 assert(is_valuetype(), "called with a non-valuetype type");
153 assert(!is_null(), "valuetype is not null");
154 return (!from.is_null() && from.is_valuetype() && name() == from.name());
155 }
156
157 bool VerificationType::is_ref_assignable_from_value_type(const VerificationType& from, ClassVerifier* context, TRAPS) const {
158 assert(!from.is_null(), "Value type should not be null");
159 if (!is_null() && (name()->is_same_fundamental_type(from.name()) ||
160 name() == vmSymbols::java_lang_Object())) {
161 return true;
162 }
163
164 // Need to load 'this' to see if it is an interface.
165 InstanceKlass* klass = context->current_class();
166 {
167 HandleMark hm(THREAD);
168 Klass* this_class = SystemDictionary::resolve_or_fail(
169 name(), Handle(THREAD, klass->class_loader()),
170 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
171 klass->class_loader_data()->record_dependency(this_class);
172 if (log_is_enabled(Debug, class, resolve)) {
173 Verifier::trace_class_resolution(this_class, klass);
174 }
175 return (this_class->is_interface());
176 }
177 }
178
179 VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const {
180 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
181 Symbol* component;
182 switch (name()->char_at(1)) {
183 case 'Z': return VerificationType(Boolean);
184 case 'B': return VerificationType(Byte);
185 case 'C': return VerificationType(Char);
186 case 'S': return VerificationType(Short);
187 case 'I': return VerificationType(Integer);
188 case 'J': return VerificationType(Long);
189 case 'F': return VerificationType(Float);
190 case 'D': return VerificationType(Double);
191 case '[':
192 component = context->create_temporary_symbol(
193 name(), 1, name()->utf8_length());
194 return VerificationType::reference_type(component);
195 case 'L':
196 component = context->create_temporary_symbol(
197 name(), 2, name()->utf8_length() - 1);
198 return VerificationType::reference_type(component);
199 case 'Q':
200 component = context->create_temporary_symbol(
201 name(), 2, name()->utf8_length() - 1);
202 return VerificationType::valuetype_type(component);
203 default:
204 // Met an invalid type signature, e.g. [X
205 return VerificationType::bogus_type();
206 }
207 }
208
209 void VerificationType::print_on(outputStream* st) const {
210 switch (_u._data) {
211 case Bogus: st->print("top"); break;
212 case Category1: st->print("category1"); break;
213 case Category2: st->print("category2"); break;
214 case Category2_2nd: st->print("category2_2nd"); break;
215 case Boolean: st->print("boolean"); break;
216 case Byte: st->print("byte"); break;
217 case Short: st->print("short"); break;
218 case Char: st->print("char"); break;
219 case Integer: st->print("integer"); break;
220 case Float: st->print("float"); break;
221 case Long: st->print("long"); break;
222 case Double: st->print("double"); break;
223 case Long_2nd: st->print("long_2nd"); break;
224 case Double_2nd: st->print("double_2nd"); break;
225 case Null: st->print("null"); break;
226 case ReferenceQuery: st->print("reference type"); break;
227 case ValueTypeQuery: st->print("inline type"); break;
228 case NonScalarQuery: st->print("reference or inline type"); break;
229 case Category1Query: st->print("category1 type"); break;
230 case Category2Query: st->print("category2 type"); break;
231 case Category2_2ndQuery: st->print("category2_2nd type"); break;
232 default:
233 if (is_uninitialized_this()) {
234 st->print("uninitializedThis");
235 } else if (is_uninitialized()) {
236 st->print("uninitialized %d", bci());
237 } else if (is_valuetype()) {
238 name()->print_Qvalue_on(st);
239 } else {
240 if (name() != NULL) {
241 name()->print_value_on(st);
242 } else {
243 st->print_cr("NULL");
244 }
245 }
246 }
247 }
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