1 /*
  2  * Copyright (c) 1997, 2023, 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 "runtime/fieldDescriptor.inline.hpp"
 35 #include "runtime/handles.inline.hpp"
 36 #include "runtime/signature.hpp"
 37 
 38 Symbol* fieldDescriptor::generic_signature() const {
 39   if (!has_generic_signature()) {
 40     return nullptr;
 41   }
 42   return _cp->symbol_at(_fieldinfo.generic_signature_index());
 43 }
 44 
 45 bool fieldDescriptor::is_trusted_final() const {
 46   InstanceKlass* ik = field_holder();
 47   return is_final() && (is_static() || ik->is_hidden() || ik->is_record());
 48 }
 49 
 50 AnnotationArray* fieldDescriptor::annotations() const {
 51   InstanceKlass* ik = field_holder();
 52   Array<AnnotationArray*>* md = ik->fields_annotations();
 53   if (md == nullptr)
 54     return nullptr;
 55   return md->at(index());
 56 }
 57 
 58 AnnotationArray* fieldDescriptor::type_annotations() const {
 59   InstanceKlass* ik = field_holder();
 60   Array<AnnotationArray*>* type_annos = ik->fields_type_annotations();
 61   if (type_annos == nullptr)
 62     return nullptr;
 63   return type_annos->at(index());
 64 }
 65 
 66 constantTag fieldDescriptor::initial_value_tag() const {
 67   return constants()->tag_at(initial_value_index());
 68 }
 69 
 70 jint fieldDescriptor::int_initial_value() const {
 71   return constants()->int_at(initial_value_index());
 72 }
 73 
 74 jlong fieldDescriptor::long_initial_value() const {
 75   return constants()->long_at(initial_value_index());
 76 }
 77 
 78 jfloat fieldDescriptor::float_initial_value() const {
 79   return constants()->float_at(initial_value_index());
 80 }
 81 
 82 jdouble fieldDescriptor::double_initial_value() const {
 83   return constants()->double_at(initial_value_index());
 84 }
 85 
 86 oop fieldDescriptor::string_initial_value(TRAPS) const {
 87   return constants()->uncached_string_at(initial_value_index(), THREAD);
 88 }
 89 
 90 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) {
 91   if (_cp.is_null() || field_holder() != ik) {
 92     _cp = constantPoolHandle(Thread::current(), ik->constants());
 93     // _cp should now reference ik's constant pool; i.e., ik is now field_holder.
 94     // If the class is a scratch class, the constant pool points to the original class,
 95     // but that's ok because of constant pool merging.
 96     assert(field_holder() == ik || ik->is_scratch_class(), "must be already initialized to this class");
 97   }
 98   _fieldinfo= ik->field(index);
 99   assert((int)_fieldinfo.index() == index, "just checking");
100   guarantee(_fieldinfo.name_index() != 0 && _fieldinfo.signature_index() != 0, "bad constant pool index for fieldDescriptor");
101 }
102 
103 void fieldDescriptor::print_on(outputStream* st) const {
104   access_flags().print_on(st);
105   if (field_flags().is_injected()) st->print("injected ");
106   name()->print_value_on(st);
107   st->print(" ");
108   signature()->print_value_on(st);
109   st->print(" @%d ", offset());
110   if (WizardMode && has_initial_value()) {
111     st->print("(initval ");
112     constantTag t = initial_value_tag();
113     if (t.is_int()) {
114       st->print("int %d)", int_initial_value());
115     } else if (t.is_long()){
116       st->print_jlong(long_initial_value());
117     } else if (t.is_float()){
118       st->print("float %f)", float_initial_value());
119     } else if (t.is_double()){
120       st->print("double %lf)", double_initial_value());
121     }
122   }
123 }
124 
125 void fieldDescriptor::print() const { print_on(tty); }
126 
127 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
128   print_on(st);
129   st->print(" ");
130 
131   BasicType ft = field_type();





132   switch (ft) {
133     case T_BYTE:
134       st->print("%d", obj->byte_field(offset()));
135       break;
136     case T_CHAR:
137       {
138         jchar c = obj->char_field(offset());
139         st->print("%c %d", isprint(c) ? c : ' ', c);
140       }
141       break;
142     case T_DOUBLE:
143       st->print("%lf", obj->double_field(offset()));
144       break;
145     case T_FLOAT:
146       st->print("%f", obj->float_field(offset()));
147       break;
148     case T_INT:
149       st->print("%d", obj->int_field(offset()));
150       break;
151     case T_LONG:
152       st->print_jlong(obj->long_field(offset()));
153       break;
154     case T_SHORT:
155       st->print("%d", obj->short_field(offset()));
156       break;
157     case T_BOOLEAN:
158       st->print("%s", obj->bool_field(offset()) ? "true" : "false");
159       break;
160     case T_ARRAY:
161       if (obj->obj_field(offset()) != nullptr) {
162         obj->obj_field(offset())->print_value_on(st);
163       } else {
164         st->print("null");
165       }
166       break;
167     case T_OBJECT:












168       if (obj->obj_field(offset()) != nullptr) {
169         obj->obj_field(offset())->print_value_on(st);
170       } else {
171         st->print("null");
172       }
173       break;
174     default:
175       ShouldNotReachHere();
176       break;
177   }
178 
179   // Print a hint as to the underlying integer representation.
180   if (is_reference_type(ft)) {
181 #ifdef _LP64
182     if (UseCompressedOops) {
183       st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));
184     } else {
185       st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset()));
186     }
187 #else
188     st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));
189 #endif
190   } else { // Primitives
191     switch (ft) {
192       case T_LONG:    st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset())); break;
193       case T_DOUBLE:  st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset())); break;
194       case T_BYTE:    st->print(" (" INT8_FORMAT_X_0  ")", obj->byte_field(offset()));          break;
195       case T_CHAR:    st->print(" (" INT16_FORMAT_X_0 ")", obj->char_field(offset()));          break;
196       case T_FLOAT:   st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));           break;
197       case T_INT:     st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));           break;
198       case T_SHORT:   st->print(" (" INT16_FORMAT_X_0 ")", obj->short_field(offset()));         break;
199       case T_BOOLEAN: st->print(" (" INT8_FORMAT_X_0  ")", obj->bool_field(offset()));          break;
200     default:
201       ShouldNotReachHere();
202       break;
203     }
204   }

205 }
--- EOF ---