1 /* 2 * Copyright (c) 1999, 2013, 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 ciMethodData; 45 friend class ciObjArrayKlass; 46 47 private: 48 ciSymbol* _name; 49 jint _layout_helper; 50 51 protected: 52 ciKlass(KlassHandle k_h, ciSymbol* name); 53 ciKlass(ciSymbol* name, BasicType bt); 54 55 Klass* get_Klass() const { 56 Klass* k = (Klass*)_metadata; 57 assert(k != NULL, "illegal use of unloaded klass"); 58 return k; 59 } 60 61 // Certain subklasses have an associated class loader. 62 virtual oop loader() { return NULL; } 63 virtual jobject loader_handle() { return NULL; } 64 65 virtual oop protection_domain() { return NULL; } 66 virtual jobject protection_domain_handle() { return NULL; } 67 68 const char* type_string() { return "ciKlass"; } 69 70 void print_impl(outputStream* st); 71 72 public: 73 ciKlass(KlassHandle k_h); 74 75 // What is the name of this klass? 76 ciSymbol* name() const { return _name; } 77 78 // What is its layout helper value? 79 jint layout_helper() { return _layout_helper; } 80 81 bool is_subtype_of(ciKlass* klass); 82 bool is_subclass_of(ciKlass* klass); 83 juint super_depth(); 84 juint super_check_offset(); 85 ciKlass* super_of_depth(juint i); 86 bool can_be_primary_super(); 87 static juint primary_super_limit() { return Klass::primary_super_limit(); } 88 89 // Is this ciObject the ciInstanceKlass representing java.lang.Object()? 90 virtual bool is_java_lang_Object() const { return false; } 91 92 // Get the shared parent of two klasses. 93 ciKlass* least_common_ancestor(ciKlass* k); 94 95 virtual bool is_interface() { 96 return false; 97 } 98 99 virtual bool is_abstract() { 100 return false; 101 } 102 103 // Does this type (array, class, interface) have no subtypes? 104 virtual bool is_leaf_type() { 105 return false; 106 } 107 108 // Attempt to get a klass using this ciKlass's loader. 109 ciKlass* find_klass(ciSymbol* klass_name); 110 // Note: To find a class from its name string, use ciSymbol::make, 111 // but consider adding to vmSymbols.hpp instead. 112 113 // Get the instance of java.lang.Class corresponding to this klass. 114 ciInstance* java_mirror(); 115 116 // Fetch Klass::modifier_flags. 117 jint modifier_flags(); 118 119 // Fetch Klass::access_flags. 120 jint access_flags(); 121 122 // What kind of ciObject is this? 123 bool is_klass() const { return true; } 124 125 virtual ciKlass* exact_klass() = 0; 126 127 void print_name_on(outputStream* st); 128 129 const char* external_name() const; 130 }; 131 132 #endif // SHARE_VM_CI_CIKLASS_HPP