1 /* 2 * Copyright (c) 1997, 2018, 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 "utilities/globalDefinitions.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 42 JVM_CONSTANT_StringIndex = 102, // Temporary tag while constructing constant pool 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_InternalMax = 106 // Last implementation tag 48 }; 49 50 51 class constantTag { 52 private: 53 jbyte _tag; 54 public: is_klass() const55 bool is_klass() const { return _tag == JVM_CONSTANT_Class; } is_field() const56 bool is_field () const { return _tag == JVM_CONSTANT_Fieldref; } is_method() const57 bool is_method() const { return _tag == JVM_CONSTANT_Methodref; } is_interface_method() const58 bool is_interface_method() const { return _tag == JVM_CONSTANT_InterfaceMethodref; } is_string() const59 bool is_string() const { return _tag == JVM_CONSTANT_String; } is_int() const60 bool is_int() const { return _tag == JVM_CONSTANT_Integer; } is_float() const61 bool is_float() const { return _tag == JVM_CONSTANT_Float; } is_long() const62 bool is_long() const { return _tag == JVM_CONSTANT_Long; } is_double() const63 bool is_double() const { return _tag == JVM_CONSTANT_Double; } is_name_and_type() const64 bool is_name_and_type() const { return _tag == JVM_CONSTANT_NameAndType; } is_utf8() const65 bool is_utf8() const { return _tag == JVM_CONSTANT_Utf8; } 66 is_invalid() const67 bool is_invalid() const { return _tag == JVM_CONSTANT_Invalid; } 68 is_unresolved_klass() const69 bool is_unresolved_klass() const { 70 return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError; 71 } 72 is_unresolved_klass_in_error() const73 bool is_unresolved_klass_in_error() const { 74 return _tag == JVM_CONSTANT_UnresolvedClassInError; 75 } 76 is_method_handle_in_error() const77 bool is_method_handle_in_error() const { 78 return _tag == JVM_CONSTANT_MethodHandleInError; 79 } is_method_type_in_error() const80 bool is_method_type_in_error() const { 81 return _tag == JVM_CONSTANT_MethodTypeInError; 82 } 83 is_dynamic_constant_in_error() const84 bool is_dynamic_constant_in_error() const { 85 return _tag == JVM_CONSTANT_DynamicInError; 86 } 87 is_klass_index() const88 bool is_klass_index() const { return _tag == JVM_CONSTANT_ClassIndex; } is_string_index() const89 bool is_string_index() const { return _tag == JVM_CONSTANT_StringIndex; } 90 is_klass_reference() const91 bool is_klass_reference() const { return is_klass_index() || is_unresolved_klass(); } is_klass_or_reference() const92 bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); } is_field_or_method() const93 bool is_field_or_method() const { return is_field() || is_method() || is_interface_method(); } is_symbol() const94 bool is_symbol() const { return is_utf8(); } 95 is_method_type() const96 bool is_method_type() const { return _tag == JVM_CONSTANT_MethodType; } is_method_handle() const97 bool is_method_handle() const { return _tag == JVM_CONSTANT_MethodHandle; } is_dynamic_constant() const98 bool is_dynamic_constant() const { return _tag == JVM_CONSTANT_Dynamic; } is_invoke_dynamic() const99 bool is_invoke_dynamic() const { return _tag == JVM_CONSTANT_InvokeDynamic; } 100 is_loadable_constant() const101 bool is_loadable_constant() const { 102 return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) || 103 is_method_type() || is_method_handle() || is_dynamic_constant() || 104 is_unresolved_klass()); 105 } 106 constantTag()107 constantTag() { 108 _tag = JVM_CONSTANT_Invalid; 109 } constantTag(jbyte tag)110 constantTag(jbyte tag) { 111 assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) || 112 (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) || 113 (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag"); 114 _tag = tag; 115 } 116 ofBasicType(BasicType bt)117 static constantTag ofBasicType(BasicType bt) { 118 if (is_subword_type(bt)) bt = T_INT; 119 switch (bt) { 120 case T_OBJECT: return constantTag(JVM_CONSTANT_String); 121 case T_INT: return constantTag(JVM_CONSTANT_Integer); 122 case T_LONG: return constantTag(JVM_CONSTANT_Long); 123 case T_FLOAT: return constantTag(JVM_CONSTANT_Float); 124 case T_DOUBLE: return constantTag(JVM_CONSTANT_Double); 125 default: break; 126 } 127 assert(false, "bad basic type for tag"); 128 return constantTag(); 129 } 130 value() const131 jbyte value() const { return _tag; } 132 jbyte error_value() const; 133 jbyte non_error_value() const; 134 135 BasicType basic_type() const; // if used with ldc, what kind of value gets pushed? 136 137 const char* internal_name() const; // for error reporting 138 139 void print_on(outputStream* st) const PRODUCT_RETURN; 140 }; 141 142 #endif // SHARE_VM_UTILITIES_CONSTANTTAG_HPP 143