1 /* 2 * Copyright (c) 1997, 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_UTILITIES_CONSTANTTAG_HPP 26 #define SHARE_VM_UTILITIES_CONSTANTTAG_HPP 27 28 #include "jvm.h" 29 #include "memory/allocation.hpp" 30 31 // constant tags in Java .class files 32 33 34 enum { 35 // See jvm.h for shared JVM_CONSTANT_XXX tags 36 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java 37 // Hotspot specific tags 38 JVM_CONSTANT_Invalid = 0, // For bad value initialization 39 JVM_CONSTANT_InternalMin = 100, // First implementation tag (aside from bad value of course) 40 JVM_CONSTANT_UnresolvedClass = 100, // Temporary tag until actual use 41 JVM_CONSTANT_ClassIndex = 101, // Temporary tag while constructing constant pool, class redefinition 42 JVM_CONSTANT_StringIndex = 102, // Temporary tag while constructing constant pool, class redefinition 43 JVM_CONSTANT_UnresolvedClassInError = 103, // Error tag due to resolution error 44 JVM_CONSTANT_MethodHandleInError = 104, // Error tag due to resolution error 45 JVM_CONSTANT_MethodTypeInError = 105, // Error tag due to resolution error 46 JVM_CONSTANT_DynamicInError = 106, // Error tag due to resolution error 47 JVM_CONSTANT_Value = 107, // Internal derived value type 48 JVM_CONSTANT_ValueIndex = 108, // Temporary tag while construction constant pool, class redefinition 49 JVM_CONSTANT_UnresolvedValue = 109, // Temporary tag until actual use of derived value type 50 JVM_CONSTANT_UnresolvedValueInError = 110, // Error tag due to resolution error 51 JVM_CONSTANT_InternalMax = 110 // Last implementation tag 52 }; 53 54 55 class constantTag VALUE_OBJ_CLASS_SPEC { 56 private: 57 jbyte _tag; 58 public: 59 bool is_klass() const { return _tag == JVM_CONSTANT_Class; } 60 bool is_value_type() const { return _tag == JVM_CONSTANT_Value; } 61 bool is_field () const { return _tag == JVM_CONSTANT_Fieldref; } 62 bool is_method() const { return _tag == JVM_CONSTANT_Methodref; } 63 bool is_interface_method() const { return _tag == JVM_CONSTANT_InterfaceMethodref; } 64 bool is_string() const { return _tag == JVM_CONSTANT_String; } 65 bool is_int() const { return _tag == JVM_CONSTANT_Integer; } 66 bool is_float() const { return _tag == JVM_CONSTANT_Float; } 67 bool is_long() const { return _tag == JVM_CONSTANT_Long; } 68 bool is_double() const { return _tag == JVM_CONSTANT_Double; } 69 bool is_name_and_type() const { return _tag == JVM_CONSTANT_NameAndType; } 70 bool is_utf8() const { return _tag == JVM_CONSTANT_Utf8; } 71 72 bool is_invalid() const { return _tag == JVM_CONSTANT_Invalid; } 73 74 bool is_unresolved_klass() const { 75 return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError; 76 } 77 78 bool is_unresolved_klass_in_error() const { 79 return _tag == JVM_CONSTANT_UnresolvedClassInError; 80 } 81 82 bool is_unresolved_value_type() const { 83 return _tag == JVM_CONSTANT_UnresolvedValue || _tag == JVM_CONSTANT_UnresolvedValueInError; 84 } 85 86 bool is_unresolved_value_type_in_error() const { 87 return _tag == JVM_CONSTANT_UnresolvedValueInError; 88 } 89 90 bool is_method_handle_in_error() const { 91 return _tag == JVM_CONSTANT_MethodHandleInError; 92 } 93 bool is_method_type_in_error() const { 94 return _tag == JVM_CONSTANT_MethodTypeInError; 95 } 96 97 bool is_dynamic_constant_in_error() const { 98 return _tag == JVM_CONSTANT_DynamicInError; 99 } 100 101 bool is_klass_index() const { return _tag == JVM_CONSTANT_ClassIndex; } 102 bool is_value_type_index() const { return _tag == JVM_CONSTANT_ValueIndex; } 103 bool is_string_index() const { return _tag == JVM_CONSTANT_StringIndex; } 104 105 bool is_klass_reference() const { return is_klass_index() || is_unresolved_klass(); } 106 bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); } 107 bool is_field_or_method() const { return is_field() || is_method() || is_interface_method(); } 108 bool is_symbol() const { return is_utf8(); } 109 110 bool is_value_type_or_reference() const { return is_value_type_index() || is_value_type() || is_unresolved_value_type(); } 111 112 bool is_method_type() const { return _tag == JVM_CONSTANT_MethodType; } 113 bool is_method_handle() const { return _tag == JVM_CONSTANT_MethodHandle; } 114 bool is_dynamic_constant() const { return _tag == JVM_CONSTANT_Dynamic; } 115 bool is_invoke_dynamic() const { return _tag == JVM_CONSTANT_InvokeDynamic; } 116 117 bool is_loadable_constant() const { 118 return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) || 119 is_method_type() || is_method_handle() || is_dynamic_constant() || 120 is_unresolved_klass()); 121 } 122 123 constantTag() { 124 _tag = JVM_CONSTANT_Invalid; 125 } 126 constantTag(jbyte tag) { 127 assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) || 128 (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) || 129 (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag"); 130 _tag = tag; 131 } 132 133 static constantTag ofBasicType(BasicType bt) { 134 if (is_subword_type(bt)) bt = T_INT; 135 switch (bt) { 136 case T_OBJECT: return constantTag(JVM_CONSTANT_String); 137 case T_INT: return constantTag(JVM_CONSTANT_Integer); 138 case T_LONG: return constantTag(JVM_CONSTANT_Long); 139 case T_FLOAT: return constantTag(JVM_CONSTANT_Float); 140 case T_DOUBLE: return constantTag(JVM_CONSTANT_Double); 141 default: break; 142 } 143 assert(false, "bad basic type for tag"); 144 return constantTag(); 145 } 146 147 jbyte value() const { return _tag; } 148 jbyte error_value() const; 149 jbyte non_error_value() const; 150 151 BasicType basic_type() const; // if used with ldc, what kind of value gets pushed? 152 153 const char* internal_name() const; // for error reporting 154 155 void print_on(outputStream* st) const PRODUCT_RETURN; 156 }; 157 158 #endif // SHARE_VM_UTILITIES_CONSTANTTAG_HPP