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



129   BasicType ft = field_type();
130   if (!is_null_free_inline_type()) {
131     print_on(st);
132     st->print(" ");
133   }
134   jint as_int = 0;
135   switch (ft) {
136     case T_BYTE:
137       st->print("%d", obj->byte_field(offset()));
138       break;
139     case T_CHAR:
140       {
141         jchar c = obj->char_field(offset());
142         st->print("%c %d", isprint(c) ? c : ' ', c);
143       }
144       break;
145     case T_DOUBLE:
146       st->print("%lf", obj->double_field(offset()));
147       break;
148     case T_FLOAT:
149       st->print("%f", obj->float_field(offset()));
150       break;
151     case T_INT:
152       st->print("%d", obj->int_field(offset()));
153       break;
154     case T_LONG:
155       st->print_jlong(obj->long_field(offset()));
156       break;
157     case T_SHORT:
158       st->print("%d", obj->short_field(offset()));
159       break;
160     case T_BOOLEAN:
161       st->print("%s", obj->bool_field(offset()) ? "true" : "false");
162       break;
163     case T_ARRAY:






164     case T_OBJECT:
165       if (is_flat()) { // only some inline types can be flat
166         assert(is_null_free_inline_type(), "Only null free inline type fields can be flat");
167         // Print fields of flat fields (recursively)
168         InlineKlass* vk = InlineKlass::cast(field_holder()->get_inline_type_field_klass(index()));
169         int field_offset = offset() - vk->first_field_offset();
170         obj = cast_to_oop(cast_from_oop<address>(obj) + field_offset);
171         st->print_cr("Flat inline type field '%s':", vk->name()->as_C_string());
172         FieldPrinter print_field(st, obj);
173         vk->do_nonstatic_fields(&print_field);
174         return; // Do not print underlying representation
175       }
176       // Not flat inline type field, fall through
177       if (obj->obj_field(offset()) != nullptr) {
178         obj->obj_field(offset())->print_value_on(st);
179       } else {
180         st->print("null");
181       }
182       break;
183     default:
184       ShouldNotReachHere();
185       break;
186   }
187 
188   // Print a hint as to the underlying integer representation.
189   if (is_reference_type(ft)) {
190 #ifdef _LP64
191     if (UseCompressedOops) {
192       st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));
193     } else {
194       st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset()));
195     }
196 #else
197     st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));
198 #endif
199   } else { // Primitives
200     switch (ft) {
201       case T_LONG:    st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset())); break;
202       case T_DOUBLE:  st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset())); break;
203       case T_BYTE:    st->print(" (" INT8_FORMAT_X_0  ")", obj->byte_field(offset()));          break;
204       case T_CHAR:    st->print(" (" INT16_FORMAT_X_0 ")", obj->char_field(offset()));          break;
205       case T_FLOAT:   st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));           break;
206       case T_INT:     st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));           break;
207       case T_SHORT:   st->print(" (" INT16_FORMAT_X_0 ")", obj->short_field(offset()));         break;
208       case T_BOOLEAN: st->print(" (" INT8_FORMAT_X_0  ")", obj->bool_field(offset()));          break;
209     default:
210       ShouldNotReachHere();
211       break;
212     }
213   }
214   st->cr();
215 }
--- EOF ---