1/*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
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24
25#ifndef SHARE_CI_CIKLASS_HPP
26#define SHARE_CI_CIKLASS_HPP
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.
40class 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
49private:
50 ciSymbol* _name;
51 jint _layout_helper;
52
53protected:
54 ciKlass(Klass* k, ciSymbol* name);
55 ciKlass(ciSymbol* name, BasicType bt);
56
57 Klass* get_Klass() const {
58 Klass* k = (Klass*)_metadata;
59 assert(k != NULL, "illegal use of unloaded klass");
60 return k;
61 }
62
63 // Certain subklasses have an associated class loader.
64 virtual oop loader() { return NULL; }
65 virtual jobject loader_handle() { return NULL; }
66
67 virtual oop protection_domain() { return NULL; }
68 virtual jobject protection_domain_handle() { return NULL; }
69
70 const char* type_string() { return "ciKlass"; }
71
72 void print_impl(outputStream* st);
73
74public:
75 ciKlass(Klass* k);
76
77 // What is the name of this klass?
78 ciSymbol* name() const { return _name; }
79
80 // What is its layout helper value?
81 jint layout_helper() { return _layout_helper; }
82
83 bool is_subtype_of(ciKlass* klass);
84 bool is_subclass_of(ciKlass* klass);
85 juint super_depth();
86 juint super_check_offset();
87 ciKlass* super_of_depth(juint i);
88 bool can_be_primary_super();
89 static juint primary_super_limit() { return Klass::primary_super_limit(); }
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
135