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1 /*
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2 * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // ciKlass
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26 //
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27 // This class and its subclasses represent klassOops in the
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28 // HotSpot virtual machine. In the vm, each klassOop contains an
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29 // embedded Klass object. ciKlass is subclassed to explicitly
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30 // represent the kind of Klass embedded in the klassOop. For
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31 // example, a klassOop with an embedded objArrayKlass object is
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32 // represented in the ciObject hierarchy by the class
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33 // ciObjArrayKlass.
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34 class ciKlass : public ciType {
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35 CI_PACKAGE_ACCESS
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36 friend class ciEnv;
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37 friend class ciField;
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38 friend class ciMethod;
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39 friend class ciObjArrayKlass;
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40
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41 private:
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42 ciSymbol* _name;
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43 jint _layout_helper;
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44
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45 protected:
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46 ciKlass(KlassHandle k_h, ciSymbol* name);
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47 ciKlass(ciSymbol* name, ciKlass* klass);
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48
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49 klassOop get_klassOop() const {
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50 klassOop k = (klassOop)get_oop();
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51 assert(k != NULL, "illegal use of unloaded klass");
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52 return k;
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53 }
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54
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55 Klass* get_Klass() const { return get_klassOop()->klass_part(); }
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56
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57 // Certain subklasses have an associated class loader.
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58 virtual oop loader() { return NULL; }
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59 virtual jobject loader_handle() { return NULL; }
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60
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61 virtual oop protection_domain() { return NULL; }
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62 virtual jobject protection_domain_handle() { return NULL; }
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63
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64 const char* type_string() { return "ciKlass"; }
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65
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66 void print_impl(outputStream* st);
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67
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68 public:
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69 ciKlass(KlassHandle k_h);
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70
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71 // What is the name of this klass?
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72 ciSymbol* name() { return _name; }
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73
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74 // What is its layout helper value?
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75 jint layout_helper() { return _layout_helper; }
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76
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77 bool is_subtype_of(ciKlass* klass);
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78 bool is_subclass_of(ciKlass* klass);
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79 juint super_depth();
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80 juint super_check_offset();
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81 ciKlass* super_of_depth(juint i);
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82 bool can_be_primary_super();
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83 static juint primary_super_limit() { return Klass::primary_super_limit(); }
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84
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85 // Get the shared parent of two klasses.
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86 ciKlass* least_common_ancestor(ciKlass* k);
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87
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88 virtual bool is_interface() {
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89 return false;
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90 }
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91
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92 virtual bool is_abstract() {
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93 return false;
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94 }
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95
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96 // Does this type (array, class, interface) have no subtypes?
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97 virtual bool is_leaf_type() {
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98 return false;
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99 }
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100
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101 // Attempt to get a klass using this ciKlass's loader.
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102 ciKlass* find_klass(ciSymbol* klass_name);
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103 // Note: To find a class from its name string, use ciSymbol::make,
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104 // but consider adding to vmSymbols.hpp instead.
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105
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106 // Get the instance of java.lang.Class corresponding to this klass.
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107 ciInstance* java_mirror();
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108
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109 // Fetch Klass::modifier_flags.
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110 jint modifier_flags();
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111
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112 // Fetch Klass::access_flags.
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113 jint access_flags();
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114
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115 // What kind of ciObject is this?
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116 bool is_klass() { return true; }
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117
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118 void print_name_on(outputStream* st);
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119 };
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