1 /* 2 * Copyright (c) 2000, 2017, 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_CITYPE_HPP 26 #define SHARE_VM_CI_CITYPE_HPP 27 28 #include "ci/ciMetadata.hpp" 29 30 // ciType 31 // 32 // This class represents either a class (T_OBJECT), value (T_VALUETYPE), 33 // array (T_ARRAY), or one of the primitive types such as T_INT. 34 class ciType : public ciMetadata { 35 CI_PACKAGE_ACCESS 36 friend class ciKlass; 37 friend class ciReturnAddress; 38 39 private: 40 BasicType _basic_type; 41 42 ciType(BasicType t); // for primitive and unloaded types 43 ciType(Klass* k); // for subclasses (reference types) 44 45 const char* type_string() { return "ciType"; } 46 47 void print_impl(outputStream* st); 48 49 // Distinguished instances of primitive ciTypes.. 50 static ciType* _basic_types[T_CONFLICT+1]; 51 52 public: 53 BasicType basic_type() const { return _basic_type; } 54 55 // Returns true iff the types are identical, or if both are klasses 56 // and the is_subtype_of relation holds between the klasses. 57 bool is_subtype_of(ciType* type); 58 59 // Get the instance of java.lang.Class corresponding to this type. 60 // There are mirrors for instance, array, and primitive types (incl. void). 61 virtual ciInstance* java_mirror(); 62 63 // Get the class which "boxes" (or "wraps") values of this type. 64 // Example: short is boxed by java.lang.Short, etc. 65 // Returns self if it is a reference type. 66 // Returns NULL for void, since null is used in such cases. 67 ciKlass* box_klass(); 68 69 // Returns true if this is not a klass or array (i.e., not a reference type). 70 bool is_primitive_type() const { return basic_type() != T_OBJECT && basic_type() != T_ARRAY && basic_type() != T_VALUETYPE; } 71 int size() const { return type2size[basic_type()]; } 72 bool is_void() const { return basic_type() == T_VOID; } 73 bool is_one_word() const { return size() == 1; } 74 bool is_two_word() const { return size() == 2; } 75 76 // What kind of ciObject is this? 77 bool is_type() const { return true; } 78 bool is_classless() const { return is_primitive_type(); } 79 bool is__Value() const; 80 81 const char* name(); 82 virtual void print_name_on(outputStream* st); 83 void print_name() { 84 print_name_on(tty); 85 } 86 87 static ciType* make(BasicType t); 88 }; 89 90 91 // ciReturnAddress 92 // 93 // This class represents the type of a specific return address in the 94 // bytecodes. 95 class ciReturnAddress : public ciType { 96 CI_PACKAGE_ACCESS 97 98 private: 99 // The bci of this return address. 100 int _bci; 101 102 ciReturnAddress(int bci); 103 104 const char* type_string() { return "ciReturnAddress"; } 105 106 void print_impl(outputStream* st); 107 108 public: 109 bool is_return_address() const { return true; } 110 111 int bci() { return _bci; } 112 113 static ciReturnAddress* make(int bci); 114 }; 115 116 #endif // SHARE_VM_CI_CITYPE_HPP