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 virtual oop protection_domain() { return nullptr; }
90
91 // Is this ciObject the ciInstanceKlass representing java.lang.Object()?
92 virtual bool is_java_lang_Object() const { return false; }
93
94 // Get the shared parent of two klasses.
95 ciKlass* least_common_ancestor(ciKlass* k);
96
97 virtual bool is_interface() {
98 return false;
99 }
100
101 virtual bool is_abstract() {
102 return false;
103 }
104
105 // Does this type (array, class, interface) have no subtypes?
106 virtual bool is_leaf_type() {
107 return false;
108 }
109
110 // Attempt to get a klass using this ciKlass's loader.
111 ciKlass* find_klass(ciSymbol* klass_name);
112 // Note: To find a class from its name string, use ciSymbol::make,
113 // but consider adding to vmSymbols.hpp instead.
114
115 // Get the instance of java.lang.Class corresponding to this klass.
116 ciInstance* java_mirror();
117
118 // Fetch Klass::modifier_flags.
119 jint modifier_flags();
120
121 // Fetch Klass::access_flags.
122 jint access_flags();
123
124 // What kind of ciObject is this?
125 bool is_klass() const { return true; }
126
127 virtual ciKlass* exact_klass() = 0;
128
129 void print_name_on(outputStream* st);
130
131 const char* external_name() const;
132 };
133
134 #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 virtual oop protection_domain() { return nullptr; }
92
93 // Is this ciObject the ciInstanceKlass representing java.lang.Object()?
94 virtual bool is_java_lang_Object() const { return false; }
95
96 // Get the shared parent of two klasses.
97 ciKlass* least_common_ancestor(ciKlass* k);
98
99 virtual bool is_interface() {
100 return false;
101 }
102
103 virtual bool is_abstract() {
104 return false;
105 }
106
107 // Does this type (array, class, interface) have no subtypes?
108 virtual bool is_leaf_type() {
109 return false;
110 }
111
112 virtual bool can_be_inline_klass(bool is_exact = false) {
113 return false;
114 }
115
116 virtual bool can_be_inline_array_klass() {
117 return EnableValhalla && is_java_lang_Object();
118 }
119
120 // Attempt to get a klass using this ciKlass's loader.
121 ciKlass* find_klass(ciSymbol* klass_name);
122 // Note: To find a class from its name string, use ciSymbol::make,
123 // but consider adding to vmSymbols.hpp instead.
124
125 // Get the instance of java.lang.Class corresponding to this klass.
126 ciInstance* java_mirror();
127
128 // Fetch Klass::modifier_flags.
129 jint modifier_flags();
130
131 // Fetch Klass::access_flags.
132 jint access_flags();
133
134 markWord prototype_header() const;
135
136 // What kind of ciObject is this?
137 bool is_klass() const { return true; }
138
139 virtual ciKlass* exact_klass() = 0;
140
141 void print_name_on(outputStream* st);
142
143 const char* external_name() const;
144 };
145
146 #endif // SHARE_CI_CIKLASS_HPP
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