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comparison src/share/vm/ci/ciKlass.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
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,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // ciKlass
26 //
27 // This class and its subclasses represent klassOops in the
28 // HotSpot virtual machine. In the vm, each klassOop contains an
29 // embedded Klass object. ciKlass is subclassed to explicitly
30 // represent the kind of Klass embedded in the klassOop. For
31 // example, a klassOop with an embedded objArrayKlass object is
32 // represented in the ciObject hierarchy by the class
33 // ciObjArrayKlass.
34 class ciKlass : public ciType {
35 CI_PACKAGE_ACCESS
36 friend class ciEnv;
37 friend class ciField;
38 friend class ciMethod;
39 friend class ciObjArrayKlass;
40
41 private:
42 ciSymbol* _name;
43 jint _layout_helper;
44
45 protected:
46 ciKlass(KlassHandle k_h, ciSymbol* name);
47 ciKlass(ciSymbol* name, ciKlass* klass);
48
49 klassOop get_klassOop() const {
50 klassOop k = (klassOop)get_oop();
51 assert(k != NULL, "illegal use of unloaded klass");
52 return k;
53 }
54
55 Klass* get_Klass() const { return get_klassOop()->klass_part(); }
56
57 // Certain subklasses have an associated class loader.
58 virtual oop loader() { return NULL; }
59 virtual jobject loader_handle() { return NULL; }
60
61 virtual oop protection_domain() { return NULL; }
62 virtual jobject protection_domain_handle() { return NULL; }
63
64 const char* type_string() { return "ciKlass"; }
65
66 void print_impl(outputStream* st);
67
68 public:
69 ciKlass(KlassHandle k_h);
70
71 // What is the name of this klass?
72 ciSymbol* name() { return _name; }
73
74 // What is its layout helper value?
75 jint layout_helper() { return _layout_helper; }
76
77 bool is_subtype_of(ciKlass* klass);
78 bool is_subclass_of(ciKlass* klass);
79 juint super_depth();
80 juint super_check_offset();
81 ciKlass* super_of_depth(juint i);
82 bool can_be_primary_super();
83 static juint primary_super_limit() { return Klass::primary_super_limit(); }
84
85 // Get the shared parent of two klasses.
86 ciKlass* least_common_ancestor(ciKlass* k);
87
88 virtual bool is_interface() {
89 return false;
90 }
91
92 virtual bool is_abstract() {
93 return false;
94 }
95
96 // Does this type (array, class, interface) have no subtypes?
97 virtual bool is_leaf_type() {
98 return false;
99 }
100
101 // Attempt to get a klass using this ciKlass's loader.
102 ciKlass* find_klass(ciSymbol* klass_name);
103 // Note: To find a class from its name string, use ciSymbol::make,
104 // but consider adding to vmSymbols.hpp instead.
105
106 // Get the instance of java.lang.Class corresponding to this klass.
107 ciInstance* java_mirror();
108
109 // Fetch Klass::modifier_flags.
110 jint modifier_flags();
111
112 // Fetch Klass::access_flags.
113 jint access_flags();
114
115 // What kind of ciObject is this?
116 bool is_klass() { return true; }
117
118 void print_name_on(outputStream* st);
119 };