1 /* 2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_CI_CIKLASS_HPP 26 #define SHARE_VM_CI_CIKLASS_HPP 27 28 #include "ci/ciType.hpp" 29 30 // ciKlass 31 // 32 // This class and its subclasses represent Klass*s in the 33 // HotSpot virtual machine. In the vm, each Klass* contains an 34 // embedded Klass object. ciKlass is subclassed to explicitly 35 // represent the kind of Klass embedded in the Klass*. For 36 // example, a Klass* with an embedded ObjArrayKlass object is 37 // represented in the ciObject hierarchy by the class 38 // ciObjArrayKlass. 39 class ciKlass : public ciType { 40 CI_PACKAGE_ACCESS 41 friend class ciEnv; 42 friend class ciField; 43 friend class ciMethod; 44 friend class ciObjArrayKlass; 45 46 private: 47 ciSymbol* _name; 48 jint _layout_helper; 49 50 protected: 51 ciKlass(KlassHandle k_h, ciSymbol* name); 52 ciKlass(ciSymbol* name, BasicType bt); 53 54 Klass* get_Klass() const { 55 Klass* k = (Klass*)_metadata; 56 assert(k != NULL, "illegal use of unloaded klass"); 57 return k; 58 } 59 60 // Certain subklasses have an associated class loader. 61 virtual oop loader() { return NULL; } 62 virtual jobject loader_handle() { return NULL; } 63 64 virtual oop protection_domain() { return NULL; } 65 virtual jobject protection_domain_handle() { return NULL; } 66 67 const char* type_string() { return "ciKlass"; } 68 69 void print_impl(outputStream* st); 70 71 public: 72 ciKlass(KlassHandle k_h); 73 74 // What is the name of this klass? 75 ciSymbol* name() const { return _name; } 76 77 // What is its layout helper value? 78 jint layout_helper() { return _layout_helper; } 79 80 bool is_subtype_of(ciKlass* klass); 81 bool is_subclass_of(ciKlass* klass); 82 juint super_depth(); 83 juint super_check_offset(); 84 ciKlass* super_of_depth(juint i); 85 bool can_be_primary_super(); 86 static juint primary_super_limit() { return Klass::primary_super_limit(); } 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 // Attempt to get a klass using this ciKlass's loader. 108 ciKlass* find_klass(ciSymbol* klass_name); 109 // Note: To find a class from its name string, use ciSymbol::make, 110 // but consider adding to vmSymbols.hpp instead. 111 112 // Get the instance of java.lang.Class corresponding to this klass. 113 ciInstance* java_mirror(); 114 115 // Fetch Klass::modifier_flags. 116 jint modifier_flags(); 117 118 // Fetch Klass::access_flags. 119 jint access_flags(); 120 121 // What kind of ciObject is this? 122 bool is_klass() const { return true; } 123 124 void print_name_on(outputStream* st); 125 }; 126 127 #endif // SHARE_VM_CI_CIKLASS_HPP