49 }
50
51 // Potentially resolve the target class and from class, and check whether the from class is assignable
52 // to the target class. The current_klass is the class being verified - it could also be the target in some
53 // cases, and otherwise is needed to obtain the correct classloader for resolving the other classes.
54 bool VerificationType::resolve_and_check_assignability(InstanceKlass* current_klass, Symbol* target_name, Symbol* from_name,
55 bool from_field_is_protected, bool from_is_array,
56 bool from_is_object, bool* target_is_interface, TRAPS) {
57 HandleMark hm(THREAD);
58 Klass* target_klass;
59 if (current_klass->is_hidden() && current_klass->name() == target_name) {
60 target_klass = current_klass;
61 } else {
62 target_klass = SystemDictionary::resolve_or_fail(
63 target_name, Handle(THREAD, current_klass->class_loader()), true, CHECK_false);
64 if (log_is_enabled(Debug, class, resolve)) {
65 Verifier::trace_class_resolution(target_klass, current_klass);
66 }
67 }
68
69 bool is_intf = target_klass->is_interface();
70 if (target_is_interface != nullptr) {
71 *target_is_interface = is_intf;
72 }
73
74 if (is_intf && (!from_field_is_protected ||
75 from_name != vmSymbols::java_lang_Object())) {
76 // If we are not trying to access a protected field or method in
77 // java.lang.Object then, for arrays, we only allow assignability
78 // to interfaces java.lang.Cloneable and java.io.Serializable.
79 // Otherwise, we treat interfaces as java.lang.Object.
80 return !from_is_array ||
81 target_klass == vmClasses::Cloneable_klass() ||
82 target_klass == vmClasses::Serializable_klass();
83 } else if (from_is_object) {
84 Klass* from_klass;
85 if (current_klass->is_hidden() && current_klass->name() == from_name) {
86 from_klass = current_klass;
87 } else {
88 from_klass = SystemDictionary::resolve_or_fail(
89 from_name, Handle(THREAD, current_klass->class_loader()), true, CHECK_false);
90 if (log_is_enabled(Debug, class, resolve)) {
91 Verifier::trace_class_resolution(from_klass, current_klass);
92 }
93 }
94 return from_klass->is_subclass_of(target_klass);
95 }
96
97 return false;
98 }
117
118 #if INCLUDE_CDS
119 if (CDSConfig::is_dumping_archive()) {
120 bool skip_assignability_check = false;
121 SystemDictionaryShared::add_verification_constraint(context->current_class(),
122 name(), from.name(), from_field_is_protected, from.is_array(),
123 from.is_object(), &skip_assignability_check);
124 if (skip_assignability_check) {
125 // We are not able to resolve name() or from.name(). The actual assignability check
126 // will be delayed until runtime.
127 return true;
128 }
129 }
130 #endif
131 return resolve_and_check_assignability(context->current_class(), name(), from.name(),
132 from_field_is_protected, from.is_array(),
133 from.is_object(), this_is_interface, THREAD);
134 } else if (is_array() && from.is_array()) {
135 VerificationType comp_this = get_component(context);
136 VerificationType comp_from = from.get_component(context);
137 if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
138 return comp_this.is_component_assignable_from(comp_from, context,
139 from_field_is_protected, THREAD);
140 }
141 }
142 return false;
143 }
144
145 VerificationType VerificationType::get_component(ClassVerifier *context) const {
146 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
147 SignatureStream ss(name(), false);
148 ss.skip_array_prefix(1);
149 switch (ss.type()) {
150 case T_BOOLEAN: return VerificationType(Boolean);
151 case T_BYTE: return VerificationType(Byte);
152 case T_CHAR: return VerificationType(Char);
153 case T_SHORT: return VerificationType(Short);
154 case T_INT: return VerificationType(Integer);
155 case T_LONG: return VerificationType(Long);
156 case T_FLOAT: return VerificationType(Float);
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49 }
50
51 // Potentially resolve the target class and from class, and check whether the from class is assignable
52 // to the target class. The current_klass is the class being verified - it could also be the target in some
53 // cases, and otherwise is needed to obtain the correct classloader for resolving the other classes.
54 bool VerificationType::resolve_and_check_assignability(InstanceKlass* current_klass, Symbol* target_name, Symbol* from_name,
55 bool from_field_is_protected, bool from_is_array,
56 bool from_is_object, bool* target_is_interface, TRAPS) {
57 HandleMark hm(THREAD);
58 Klass* target_klass;
59 if (current_klass->is_hidden() && current_klass->name() == target_name) {
60 target_klass = current_klass;
61 } else {
62 target_klass = SystemDictionary::resolve_or_fail(
63 target_name, Handle(THREAD, current_klass->class_loader()), true, CHECK_false);
64 if (log_is_enabled(Debug, class, resolve)) {
65 Verifier::trace_class_resolution(target_klass, current_klass);
66 }
67 }
68
69 // Need to do this check when called from CDS.
70 // if (this_class->access_flags().is_primitive_class()) {
71 // Klass* from_class = SystemDictionary::resolve_or_fail(
72 // from_name, Handle(THREAD, klass->class_loader()),
73 // Handle(THREAD, klass->protection_domain()), true, CHECK_false);
74 // return from_class == this_class;
75 // }
76 bool is_intf = target_klass->is_interface();
77 if (target_is_interface != nullptr) {
78 *target_is_interface = is_intf;
79 }
80
81 if (is_intf && (!from_field_is_protected ||
82 from_name != vmSymbols::java_lang_Object())) {
83 // If we are not trying to access a protected field or method in
84 // java.lang.Object then, for arrays, we only allow assignability
85 // to interfaces java.lang.Cloneable and java.io.Serializable
86 // Otherwise, we treat interfaces as java.lang.Object.
87 return !from_is_array ||
88 target_klass == vmClasses::Cloneable_klass() ||
89 target_klass == vmClasses::Serializable_klass();
90 } else if (from_is_object) {
91 Klass* from_klass;
92 if (current_klass->is_hidden() && current_klass->name() == from_name) {
93 from_klass = current_klass;
94 } else {
95 from_klass = SystemDictionary::resolve_or_fail(
96 from_name, Handle(THREAD, current_klass->class_loader()), true, CHECK_false);
97 if (log_is_enabled(Debug, class, resolve)) {
98 Verifier::trace_class_resolution(from_klass, current_klass);
99 }
100 }
101 return from_klass->is_subclass_of(target_klass);
102 }
103
104 return false;
105 }
124
125 #if INCLUDE_CDS
126 if (CDSConfig::is_dumping_archive()) {
127 bool skip_assignability_check = false;
128 SystemDictionaryShared::add_verification_constraint(context->current_class(),
129 name(), from.name(), from_field_is_protected, from.is_array(),
130 from.is_object(), &skip_assignability_check);
131 if (skip_assignability_check) {
132 // We are not able to resolve name() or from.name(). The actual assignability check
133 // will be delayed until runtime.
134 return true;
135 }
136 }
137 #endif
138 return resolve_and_check_assignability(context->current_class(), name(), from.name(),
139 from_field_is_protected, from.is_array(),
140 from.is_object(), this_is_interface, THREAD);
141 } else if (is_array() && from.is_array()) {
142 VerificationType comp_this = get_component(context);
143 VerificationType comp_from = from.get_component(context);
144
145 if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
146 return comp_this.is_component_assignable_from(comp_from, context,
147 from_field_is_protected, THREAD);
148 }
149 }
150 return false;
151 }
152
153 VerificationType VerificationType::get_component(ClassVerifier *context) const {
154 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
155 SignatureStream ss(name(), false);
156 ss.skip_array_prefix(1);
157 switch (ss.type()) {
158 case T_BOOLEAN: return VerificationType(Boolean);
159 case T_BYTE: return VerificationType(Byte);
160 case T_CHAR: return VerificationType(Char);
161 case T_SHORT: return VerificationType(Short);
162 case T_INT: return VerificationType(Integer);
163 case T_LONG: return VerificationType(Long);
164 case T_FLOAT: return VerificationType(Float);
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