1 /* 2 * Copyright (c) 1997, 2019, 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_UTILITIES_CONSTANTTAG_HPP 26 #define SHARE_UTILITIES_CONSTANTTAG_HPP 27 28 #include "jvm.h" 29 #include "utilities/globalDefinitions.hpp" 30 31 32 class outputStream; 33 34 // constant tags in Java .class files 35 36 enum { 37 // See jvm.h for shared JVM_CONSTANT_XXX tags 38 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java 39 // Hotspot specific tags 40 JVM_CONSTANT_Invalid = 0, // For bad value initialization 41 JVM_CONSTANT_InternalMin = 100, // First implementation tag (aside from bad value of course) 42 JVM_CONSTANT_UnresolvedClass = 100, // Temporary tag until actual use 43 JVM_CONSTANT_ClassIndex = 101, // Temporary tag while constructing constant pool, class redefinition 44 JVM_CONSTANT_StringIndex = 102, // Temporary tag while constructing constant pool, class redefinition 45 JVM_CONSTANT_UnresolvedClassInError = 103, // Error tag due to resolution error 46 JVM_CONSTANT_MethodHandleInError = 104, // Error tag due to resolution error 47 JVM_CONSTANT_MethodTypeInError = 105, // Error tag due to resolution error 48 JVM_CONSTANT_DynamicInError = 106, // Error tag due to resolution error 49 JVM_CONSTANT_InternalMax = 106 // Last implementation tag 50 }; 51 52 #define JVM_CONSTANT_QDESC_BIT (1 << 7) 53 54 class constantTag { 55 private: 56 jbyte _tag; 57 public: 58 bool is_klass() const { return value() == JVM_CONSTANT_Class; } 59 bool is_field () const { return _tag == JVM_CONSTANT_Fieldref; } 60 bool is_method() const { return _tag == JVM_CONSTANT_Methodref; } 61 bool is_interface_method() const { return _tag == JVM_CONSTANT_InterfaceMethodref; } 62 bool is_string() const { return _tag == JVM_CONSTANT_String; } 63 bool is_int() const { return _tag == JVM_CONSTANT_Integer; } 64 bool is_float() const { return _tag == JVM_CONSTANT_Float; } 65 bool is_long() const { return _tag == JVM_CONSTANT_Long; } 66 bool is_double() const { return _tag == JVM_CONSTANT_Double; } 67 bool is_name_and_type() const { return _tag == JVM_CONSTANT_NameAndType; } 68 bool is_utf8() const { return _tag == JVM_CONSTANT_Utf8; } 69 70 bool is_invalid() const { return _tag == JVM_CONSTANT_Invalid; } 71 72 bool is_unresolved_klass() const { 73 return value() == JVM_CONSTANT_UnresolvedClass || value() == JVM_CONSTANT_UnresolvedClassInError; 74 } 75 76 bool is_unresolved_klass_in_error() const { 77 return value() == JVM_CONSTANT_UnresolvedClassInError; 78 } 79 80 bool is_Qdescriptor_klass() const { 81 return (_tag & JVM_CONSTANT_QDESC_BIT) != 0; 82 } 83 84 bool is_method_handle_in_error() const { 85 return _tag == JVM_CONSTANT_MethodHandleInError; 86 } 87 bool is_method_type_in_error() const { 88 return _tag == JVM_CONSTANT_MethodTypeInError; 89 } 90 91 bool is_dynamic_constant_in_error() const { 92 return _tag == JVM_CONSTANT_DynamicInError; 93 } 94 95 bool is_klass_index() const { return _tag == JVM_CONSTANT_ClassIndex; } 96 bool is_string_index() const { return _tag == JVM_CONSTANT_StringIndex; } 97 98 bool is_klass_reference() const { return is_klass_index() || is_unresolved_klass(); } 99 bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); } 100 bool is_field_or_method() const { return is_field() || is_method() || is_interface_method(); } 101 bool is_symbol() const { return is_utf8(); } 102 103 bool is_method_type() const { return _tag == JVM_CONSTANT_MethodType; } 104 bool is_method_handle() const { return _tag == JVM_CONSTANT_MethodHandle; } 105 bool is_dynamic_constant() const { return _tag == JVM_CONSTANT_Dynamic; } 106 bool is_invoke_dynamic() const { return _tag == JVM_CONSTANT_InvokeDynamic; } 107 108 bool has_bootstrap() const { 109 return (_tag == JVM_CONSTANT_Dynamic || 110 _tag == JVM_CONSTANT_DynamicInError || 111 _tag == JVM_CONSTANT_InvokeDynamic); 112 } 113 114 bool is_loadable_constant() const { 115 return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) || 116 is_method_type() || is_method_handle() || is_dynamic_constant() || 117 is_unresolved_klass()); 118 } 119 120 constantTag() { 121 _tag = JVM_CONSTANT_Invalid; 122 } 123 constantTag(jbyte tag) { 124 jbyte entry_tag = tag & ~JVM_CONSTANT_QDESC_BIT; 125 assert((((tag & JVM_CONSTANT_QDESC_BIT) == 0) && (entry_tag >= 0 && entry_tag <= JVM_CONSTANT_NameAndType) || 126 (entry_tag >= JVM_CONSTANT_MethodHandle && entry_tag <= JVM_CONSTANT_InvokeDynamic) || 127 (entry_tag >= JVM_CONSTANT_InternalMin && entry_tag <= JVM_CONSTANT_InternalMax)) 128 || (((tag & JVM_CONSTANT_QDESC_BIT) != 0) && (entry_tag == JVM_CONSTANT_Class || 129 entry_tag == JVM_CONSTANT_UnresolvedClass || entry_tag == JVM_CONSTANT_UnresolvedClassInError 130 || entry_tag == JVM_CONSTANT_ClassIndex)) 131 , "Invalid constant tag"); 132 _tag = tag; 133 } 134 135 static constantTag ofBasicType(BasicType bt) { 136 if (is_subword_type(bt)) bt = T_INT; 137 switch (bt) { 138 case T_OBJECT: return constantTag(JVM_CONSTANT_String); 139 case T_INT: return constantTag(JVM_CONSTANT_Integer); 140 case T_LONG: return constantTag(JVM_CONSTANT_Long); 141 case T_FLOAT: return constantTag(JVM_CONSTANT_Float); 142 case T_DOUBLE: return constantTag(JVM_CONSTANT_Double); 143 default: break; 144 } 145 assert(false, "bad basic type for tag"); 146 return constantTag(); 147 } 148 149 jbyte value() const { return _tag & ~JVM_CONSTANT_QDESC_BIT; } 150 jbyte tag() const { return _tag; } 151 jbyte error_value() const; 152 jbyte non_error_value() const; 153 154 BasicType basic_type() const; // if used with ldc, what kind of value gets pushed? 155 156 const char* internal_name() const; // for error reporting 157 158 void print_on(outputStream* st) const PRODUCT_RETURN; 159 }; 160 161 #endif // SHARE_UTILITIES_CONSTANTTAG_HPP