27
28 #include "ci/ciType.hpp"
29 #include "oops/klass.hpp"
30
31 // ciKlass
32 //
33 // This class and its subclasses represent Klass*s in the
34 // HotSpot virtual machine. In the vm, each Klass* contains an
35 // embedded Klass object. ciKlass is subclassed to explicitly
36 // represent the kind of Klass embedded in the Klass*. For
37 // example, a Klass* with an embedded ObjArrayKlass object is
38 // represented in the ciObject hierarchy by the class
39 // ciObjArrayKlass.
40 class ciKlass : public ciType {
41 CI_PACKAGE_ACCESS
42 friend class ciEnv;
43 friend class ciField;
44 friend class ciMethod;
45 friend class ciMethodData;
46 friend class ciObjArrayKlass;
47 friend class ciSignature;
48 friend class ciReceiverTypeData;
49
50 private:
51 ciSymbol* _name;
52 jint _layout_helper;
53
54 protected:
55 ciKlass(Klass* k, ciSymbol* name);
56 ciKlass(ciSymbol* name, BasicType bt);
57
58 Klass* get_Klass() const {
59 Klass* k = (Klass*)_metadata;
60 assert(k != nullptr, "illegal use of unloaded klass");
61 return k;
62 }
63
64 // Certain subklasses have an associated class loader.
65 virtual oop loader() { return nullptr; }
66 virtual jobject loader_handle() { return nullptr; }
67
68 const char* type_string() { return "ciKlass"; }
87
88 // Is this ciObject the ciInstanceKlass representing java.lang.Object()?
89 virtual bool is_java_lang_Object() const { return false; }
90
91 // Get the shared parent of two klasses.
92 ciKlass* least_common_ancestor(ciKlass* k);
93
94 virtual bool is_interface() {
95 return false;
96 }
97
98 virtual bool is_abstract() {
99 return false;
100 }
101
102 // Does this type (array, class, interface) have no subtypes?
103 virtual bool is_leaf_type() {
104 return false;
105 }
106
107 bool is_in_encoding_range() {
108 Klass* k = get_Klass();
109 bool is_in_encoding_range = CompressedKlassPointers::is_encodable(k);
110 assert(is_in_encoding_range || k->is_interface() || k->is_abstract(), "sanity");
111 return is_in_encoding_range;
112 }
113
114 // Attempt to get a klass using this ciKlass's loader.
115 ciKlass* find_klass(ciSymbol* klass_name);
116 // Note: To find a class from its name string, use ciSymbol::make,
117 // but consider adding to vmSymbols.hpp instead.
118
119 // Get the instance of java.lang.Class corresponding to this klass.
120 ciInstance* java_mirror();
121
122 // Fetch modifier flags.
123 jint modifier_flags();
124
125 // Fetch Klass::access_flags.
126 jint access_flags();
127
128 // Fetch Klass::misc_flags.
129 klass_flags_t misc_flags();
130
131 // What kind of ciObject is this?
132 bool is_klass() const { return true; }
133
134 virtual ciKlass* exact_klass() = 0;
135
136 void print_name_on(outputStream* st);
137
138 const char* external_name() const;
139
140 juint prototype_header_offset();
141 uintptr_t prototype_header();
142 };
143
144 #endif // SHARE_CI_CIKLASS_HPP
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27
28 #include "ci/ciType.hpp"
29 #include "oops/klass.hpp"
30
31 // ciKlass
32 //
33 // This class and its subclasses represent Klass*s in the
34 // HotSpot virtual machine. In the vm, each Klass* contains an
35 // embedded Klass object. ciKlass is subclassed to explicitly
36 // represent the kind of Klass embedded in the Klass*. For
37 // example, a Klass* with an embedded ObjArrayKlass object is
38 // represented in the ciObject hierarchy by the class
39 // ciObjArrayKlass.
40 class ciKlass : public ciType {
41 CI_PACKAGE_ACCESS
42 friend class ciEnv;
43 friend class ciField;
44 friend class ciMethod;
45 friend class ciMethodData;
46 friend class ciObjArrayKlass;
47 friend class ciReceiverTypeData;
48 friend class ciSignature;
49 friend class ciFlatArrayKlass;
50 friend class ciArrayKlass;
51
52 private:
53 ciSymbol* _name;
54 jint _layout_helper;
55
56 protected:
57 ciKlass(Klass* k, ciSymbol* name);
58 ciKlass(ciSymbol* name, BasicType bt);
59
60 Klass* get_Klass() const {
61 Klass* k = (Klass*)_metadata;
62 assert(k != nullptr, "illegal use of unloaded klass");
63 return k;
64 }
65
66 // Certain subklasses have an associated class loader.
67 virtual oop loader() { return nullptr; }
68 virtual jobject loader_handle() { return nullptr; }
69
70 const char* type_string() { return "ciKlass"; }
89
90 // Is this ciObject the ciInstanceKlass representing java.lang.Object()?
91 virtual bool is_java_lang_Object() const { return false; }
92
93 // Get the shared parent of two klasses.
94 ciKlass* least_common_ancestor(ciKlass* k);
95
96 virtual bool is_interface() {
97 return false;
98 }
99
100 virtual bool is_abstract() {
101 return false;
102 }
103
104 // Does this type (array, class, interface) have no subtypes?
105 virtual bool is_leaf_type() {
106 return false;
107 }
108
109 virtual bool can_be_inline_klass(bool is_exact = false) {
110 return false;
111 }
112
113 virtual bool can_be_inline_array_klass() {
114 return EnableValhalla && is_java_lang_Object();
115 }
116
117 bool is_in_encoding_range() {
118 Klass* k = get_Klass();
119 bool is_in_encoding_range = CompressedKlassPointers::is_encodable(k);
120 assert(is_in_encoding_range || k->is_interface() || k->is_abstract(), "sanity");
121 return is_in_encoding_range;
122 }
123
124 // Attempt to get a klass using this ciKlass's loader.
125 ciKlass* find_klass(ciSymbol* klass_name);
126 // Note: To find a class from its name string, use ciSymbol::make,
127 // but consider adding to vmSymbols.hpp instead.
128
129 // Get the instance of java.lang.Class corresponding to this klass.
130 ciInstance* java_mirror();
131
132 // Fetch modifier flags.
133 jint modifier_flags();
134
135 // Fetch Klass::access_flags.
136 jint access_flags();
137
138 markWord prototype_header() const;
139
140 // Fetch Klass::misc_flags.
141 klass_flags_t misc_flags();
142
143 // What kind of ciObject is this?
144 bool is_klass() const { return true; }
145
146 virtual ciKlass* exact_klass() = 0;
147
148 void print_name_on(outputStream* st);
149
150 const char* external_name() const;
151
152 juint prototype_header_offset();
153 uintptr_t prototype_header();
154 };
155
156 #endif // SHARE_CI_CIKLASS_HPP
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