31 #include "oops/klass.inline.hpp"
32 #include "runtime/handles.inline.hpp"
33
34 VerificationType VerificationType::from_tag(u1 tag) {
35 switch (tag) {
36 case ITEM_Top: return bogus_type();
37 case ITEM_Integer: return integer_type();
38 case ITEM_Float: return float_type();
39 case ITEM_Double: return double_type();
40 case ITEM_Long: return long_type();
41 case ITEM_Null: return null_type();
42 default:
43 ShouldNotReachHere();
44 return bogus_type();
45 }
46 }
47
48 bool VerificationType::resolve_and_check_assignability(InstanceKlass* klass, Symbol* name,
49 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) {
50 HandleMark hm(THREAD);
51 Klass* this_class = SystemDictionary::resolve_or_fail(
52 name, Handle(THREAD, klass->class_loader()),
53 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
54 if (log_is_enabled(Debug, class, resolve)) {
55 Verifier::trace_class_resolution(this_class, klass);
56 }
57
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 from_class->is_subclass_of(this_class);
75 }
76
77 return false;
78 }
79
80 bool VerificationType::is_reference_assignable_from(
81 const VerificationType& from, ClassVerifier* context,
82 bool from_field_is_protected, TRAPS) const {
83 InstanceKlass* klass = context->current_class();
84 if (from.is_null()) {
85 // null is assignable to any reference
86 return true;
87 } else if (is_null()) {
88 return false;
89 } else if (name() == from.name()) {
90 return true;
91 } else if (is_object()) {
92 // We need check the class hierarchy to check assignability
93 if (name() == vmSymbols::java_lang_Object()) {
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31 #include "oops/klass.inline.hpp"
32 #include "runtime/handles.inline.hpp"
33
34 VerificationType VerificationType::from_tag(u1 tag) {
35 switch (tag) {
36 case ITEM_Top: return bogus_type();
37 case ITEM_Integer: return integer_type();
38 case ITEM_Float: return float_type();
39 case ITEM_Double: return double_type();
40 case ITEM_Long: return long_type();
41 case ITEM_Null: return null_type();
42 default:
43 ShouldNotReachHere();
44 return bogus_type();
45 }
46 }
47
48 bool VerificationType::resolve_and_check_assignability(InstanceKlass* klass, Symbol* name,
49 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) {
50 HandleMark hm(THREAD);
51 Klass* this_class;
52 if (klass->is_hidden() && klass->name() == name) {
53 this_class = klass;
54 } else {
55 this_class = SystemDictionary::resolve_or_fail(
56 name, Handle(THREAD, klass->class_loader()),
57 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
58 if (log_is_enabled(Debug, class, resolve)) {
59 Verifier::trace_class_resolution(this_class, klass);
60 }
61 }
62
63 if (this_class->is_interface() && (!from_field_is_protected ||
64 from_name != vmSymbols::java_lang_Object())) {
65 // If we are not trying to access a protected field or method in
66 // java.lang.Object then, for arrays, we only allow assignability
67 // to interfaces java.lang.Cloneable and java.io.Serializable.
68 // Otherwise, we treat interfaces as java.lang.Object.
69 return !from_is_array ||
70 this_class == SystemDictionary::Cloneable_klass() ||
71 this_class == SystemDictionary::Serializable_klass();
72 } else if (from_is_object) {
73 Klass* from_class;
74 if (klass->is_hidden() && klass->name() == from_name) {
75 from_class = klass;
76 } else {
77 from_class = SystemDictionary::resolve_or_fail(
78 from_name, Handle(THREAD, klass->class_loader()),
79 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
80 if (log_is_enabled(Debug, class, resolve)) {
81 Verifier::trace_class_resolution(from_class, klass);
82 }
83 }
84 return from_class->is_subclass_of(this_class);
85 }
86
87 return false;
88 }
89
90 bool VerificationType::is_reference_assignable_from(
91 const VerificationType& from, ClassVerifier* context,
92 bool from_field_is_protected, TRAPS) const {
93 InstanceKlass* klass = context->current_class();
94 if (from.is_null()) {
95 // null is assignable to any reference
96 return true;
97 } else if (is_null()) {
98 return false;
99 } else if (name() == from.name()) {
100 return true;
101 } else if (is_object()) {
102 // We need check the class hierarchy to check assignability
103 if (name() == vmSymbols::java_lang_Object()) {
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