1 /* 2 * Copyright (c) 1997, 2021, 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 #include "precompiled.hpp" 26 #include "classfile/vmSymbols.hpp" 27 #include "memory/resourceArea.hpp" 28 #include "oops/annotations.hpp" 29 #include "oops/constantPool.hpp" 30 #include "oops/instanceKlass.hpp" 31 #include "oops/klass.inline.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "oops/fieldStreams.inline.hpp" 34 #include "oops/inlineKlass.inline.hpp" 35 #include "runtime/fieldDescriptor.inline.hpp" 36 #include "runtime/handles.inline.hpp" 37 #include "runtime/signature.hpp" 38 39 40 oop fieldDescriptor::loader() const { 41 return _cp->pool_holder()->class_loader(); 42 } 43 44 Symbol* fieldDescriptor::generic_signature() const { 45 if (!has_generic_signature()) { 46 return NULL; 47 } 48 49 int idx = 0; 50 InstanceKlass* ik = field_holder(); 51 for (AllFieldStream fs(ik); !fs.done(); fs.next()) { 52 if (idx == _index) { 53 return fs.generic_signature(); 54 } else { 55 idx ++; 56 } 57 } 58 assert(false, "should never happen"); 59 return vmSymbols::void_signature(); // return a default value (for code analyzers) 60 } 61 62 bool fieldDescriptor::is_trusted_final() const { 63 InstanceKlass* ik = field_holder(); 64 return is_final() && (is_static() || ik->is_hidden() || ik->is_record() || ik->is_inline_klass()); 65 } 66 67 AnnotationArray* fieldDescriptor::annotations() const { 68 InstanceKlass* ik = field_holder(); 69 Array<AnnotationArray*>* md = ik->fields_annotations(); 70 if (md == NULL) 71 return NULL; 72 return md->at(index()); 73 } 74 75 AnnotationArray* fieldDescriptor::type_annotations() const { 76 InstanceKlass* ik = field_holder(); 77 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations(); 78 if (type_annos == NULL) 79 return NULL; 80 return type_annos->at(index()); 81 } 82 83 constantTag fieldDescriptor::initial_value_tag() const { 84 return constants()->tag_at(initial_value_index()); 85 } 86 87 jint fieldDescriptor::int_initial_value() const { 88 return constants()->int_at(initial_value_index()); 89 } 90 91 jlong fieldDescriptor::long_initial_value() const { 92 return constants()->long_at(initial_value_index()); 93 } 94 95 jfloat fieldDescriptor::float_initial_value() const { 96 return constants()->float_at(initial_value_index()); 97 } 98 99 jdouble fieldDescriptor::double_initial_value() const { 100 return constants()->double_at(initial_value_index()); 101 } 102 103 oop fieldDescriptor::string_initial_value(TRAPS) const { 104 return constants()->uncached_string_at(initial_value_index(), THREAD); 105 } 106 107 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) { 108 if (_cp.is_null() || field_holder() != ik) { 109 _cp = constantPoolHandle(Thread::current(), ik->constants()); 110 // _cp should now reference ik's constant pool; i.e., ik is now field_holder. 111 assert(field_holder() == ik, "must be already initialized to this class"); 112 } 113 FieldInfo* f = ik->field(index); 114 _access_flags = accessFlags_from(f->access_flags()); 115 guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor"); 116 _index = index; 117 verify(); 118 } 119 120 #ifndef PRODUCT 121 122 void fieldDescriptor::verify() const { 123 if (_cp.is_null()) { 124 assert(_index == badInt, "constructor must be called"); // see constructor 125 } else { 126 assert(_index >= 0, "good index"); 127 assert(access_flags().is_internal() || 128 _index < field_holder()->java_fields_count(), "oob"); 129 } 130 } 131 132 #endif /* PRODUCT */ 133 134 void fieldDescriptor::print_on(outputStream* st) const { 135 access_flags().print_on(st); 136 if (access_flags().is_internal()) st->print("internal "); 137 name()->print_value_on(st); 138 st->print(" "); 139 signature()->print_value_on(st); 140 st->print(" @%d ", offset()); 141 if (WizardMode && has_initial_value()) { 142 st->print("(initval "); 143 constantTag t = initial_value_tag(); 144 if (t.is_int()) { 145 st->print("int %d)", int_initial_value()); 146 } else if (t.is_long()){ 147 st->print_jlong(long_initial_value()); 148 } else if (t.is_float()){ 149 st->print("float %f)", float_initial_value()); 150 } else if (t.is_double()){ 151 st->print("double %lf)", double_initial_value()); 152 } 153 } 154 } 155 156 void fieldDescriptor::print() const { print_on(tty); } 157 158 void fieldDescriptor::print_on_for(outputStream* st, oop obj) { 159 BasicType ft = field_type(); 160 if (ft != T_PRIMITIVE_OBJECT) { 161 print_on(st); 162 } 163 jint as_int = 0; 164 switch (ft) { 165 case T_BYTE: 166 as_int = (jint)obj->byte_field(offset()); 167 st->print(" %d", obj->byte_field(offset())); 168 break; 169 case T_CHAR: 170 as_int = (jint)obj->char_field(offset()); 171 { 172 jchar c = obj->char_field(offset()); 173 as_int = c; 174 st->print(" %c %d", isprint(c) ? c : ' ', c); 175 } 176 break; 177 case T_DOUBLE: 178 st->print(" %lf", obj->double_field(offset())); 179 break; 180 case T_FLOAT: 181 as_int = obj->int_field(offset()); 182 st->print(" %f", obj->float_field(offset())); 183 break; 184 case T_INT: 185 as_int = obj->int_field(offset()); 186 st->print(" %d", obj->int_field(offset())); 187 break; 188 case T_LONG: 189 st->print(" "); 190 st->print_jlong(obj->long_field(offset())); 191 break; 192 case T_SHORT: 193 as_int = obj->short_field(offset()); 194 st->print(" %d", obj->short_field(offset())); 195 break; 196 case T_BOOLEAN: 197 as_int = obj->bool_field(offset()); 198 st->print(" %s", obj->bool_field(offset()) ? "true" : "false"); 199 break; 200 case T_PRIMITIVE_OBJECT: 201 if (is_inlined()) { 202 // Print fields of inlined fields (recursively) 203 InlineKlass* vk = InlineKlass::cast(field_holder()->get_inline_type_field_klass(index())); 204 int field_offset = offset() - vk->first_field_offset(); 205 obj = cast_to_oop(cast_from_oop<address>(obj) + field_offset); 206 st->print_cr("Inline type field inlined '%s':", vk->name()->as_C_string()); 207 FieldPrinter print_field(st, obj); 208 vk->do_nonstatic_fields(&print_field); 209 return; // Do not print underlying representation 210 } 211 // inline type field not inlined, fall through 212 case T_ARRAY: 213 case T_OBJECT: 214 st->print(" "); 215 NOT_LP64(as_int = obj->int_field(offset())); 216 if (obj->obj_field(offset()) != NULL) { 217 obj->obj_field(offset())->print_value_on(st); 218 } else { 219 st->print("NULL"); 220 } 221 break; 222 default: 223 ShouldNotReachHere(); 224 break; 225 } 226 // Print a hint as to the underlying integer representation. This can be wrong for 227 // pointers on an LP64 machine 228 #ifdef _LP64 229 if (is_reference_type(ft) && UseCompressedOops) { 230 st->print(" (%x)", obj->int_field(offset())); 231 } 232 else // <- intended 233 #endif 234 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) { 235 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint))); 236 } else if (as_int < 0 || as_int > 9) { 237 st->print(" (%x)", as_int); 238 } 239 st->cr(); 240 } 241