1 /* 2 * Copyright (c) 1997, 2015, 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/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "memory/resourceArea.hpp" 29 #include "memory/universe.inline.hpp" 30 #include "oops/annotations.hpp" 31 #include "oops/instanceKlass.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "oops/fieldStreams.hpp" 34 #include "runtime/fieldDescriptor.hpp" 35 #include "runtime/handles.inline.hpp" 36 #include "runtime/signature.hpp" 37 38 39 oop fieldDescriptor::loader() const { 40 return _cp->pool_holder()->class_loader(); 41 } 42 43 Symbol* fieldDescriptor::generic_signature() const { 44 if (!has_generic_signature()) { 45 return NULL; 46 } 47 48 int idx = 0; 49 InstanceKlass* ik = field_holder(); 50 for (AllFieldStream fs(ik); !fs.done(); fs.next()) { 51 if (idx == _index) { 52 return fs.generic_signature(); 53 } else { 54 idx ++; 55 } 56 } 57 assert(false, "should never happen"); 58 return NULL; 59 } 60 61 AnnotationArray* fieldDescriptor::annotations() const { 62 InstanceKlass* ik = field_holder(); 63 Array<AnnotationArray*>* md = ik->fields_annotations(); 64 if (md == NULL) 65 return NULL; 66 return md->at(index()); 67 } 68 69 AnnotationArray* fieldDescriptor::type_annotations() const { 70 InstanceKlass* ik = field_holder(); 71 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations(); 72 if (type_annos == NULL) 73 return NULL; 74 return type_annos->at(index()); 75 } 76 77 constantTag fieldDescriptor::initial_value_tag() const { 78 return constants()->tag_at(initial_value_index()); 79 } 80 81 jint fieldDescriptor::int_initial_value() const { 82 return constants()->int_at(initial_value_index()); 83 } 84 85 jlong fieldDescriptor::long_initial_value() const { 86 return constants()->long_at(initial_value_index()); 87 } 88 89 jfloat fieldDescriptor::float_initial_value() const { 90 return constants()->float_at(initial_value_index()); 91 } 92 93 jdouble fieldDescriptor::double_initial_value() const { 94 return constants()->double_at(initial_value_index()); 95 } 96 97 oop fieldDescriptor::string_initial_value(TRAPS) const { 98 return constants()->uncached_string_at(initial_value_index(), THREAD); 99 } 100 101 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) { 102 if (_cp.is_null() || field_holder() != ik) { 103 _cp = constantPoolHandle(Thread::current(), ik->constants()); 104 // _cp should now reference ik's constant pool; i.e., ik is now field_holder. 105 assert(field_holder() == ik, "must be already initialized to this class"); 106 } 107 FieldInfo* f = ik->field(index); 108 assert(!f->is_internal(), "regular Java fields only"); 109 110 _access_flags = accessFlags_from(f->access_flags()); 111 guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor"); 112 _index = index; 113 verify(); 114 } 115 116 #ifndef PRODUCT 117 118 void fieldDescriptor::verify() const { 119 if (_cp.is_null()) { 120 assert(_index == badInt, "constructor must be called"); // see constructor 121 } else { 122 assert(_index >= 0, "good index"); 123 assert(_index < field_holder()->java_fields_count(), "oob"); 124 } 125 } 126 127 void fieldDescriptor::print_on(outputStream* st) const { 128 access_flags().print_on(st); 129 name()->print_value_on(st); 130 st->print(" "); 131 signature()->print_value_on(st); 132 st->print(" @%d ", offset()); 133 if (WizardMode && has_initial_value()) { 134 st->print("(initval "); 135 constantTag t = initial_value_tag(); 136 if (t.is_int()) { 137 st->print("int %d)", int_initial_value()); 138 } else if (t.is_long()){ 139 st->print_jlong(long_initial_value()); 140 } else if (t.is_float()){ 141 st->print("float %f)", float_initial_value()); 142 } else if (t.is_double()){ 143 st->print("double %lf)", double_initial_value()); 144 } 145 } 146 } 147 148 void fieldDescriptor::print_on_for(outputStream* st, oop obj) { 149 print_on(st); 150 BasicType ft = field_type(); 151 jint as_int = 0; 152 switch (ft) { 153 case T_BYTE: 154 as_int = (jint)obj->byte_field(offset()); 155 st->print(" %d", obj->byte_field(offset())); 156 break; 157 case T_CHAR: 158 as_int = (jint)obj->char_field(offset()); 159 { 160 jchar c = obj->char_field(offset()); 161 as_int = c; 162 st->print(" %c %d", isprint(c) ? c : ' ', c); 163 } 164 break; 165 case T_DOUBLE: 166 st->print(" %lf", obj->double_field(offset())); 167 break; 168 case T_FLOAT: 169 as_int = obj->int_field(offset()); 170 st->print(" %f", obj->float_field(offset())); 171 break; 172 case T_INT: 173 as_int = obj->int_field(offset()); 174 st->print(" %d", obj->int_field(offset())); 175 break; 176 case T_LONG: 177 st->print(" "); 178 st->print_jlong(obj->long_field(offset())); 179 break; 180 case T_SHORT: 181 as_int = obj->short_field(offset()); 182 st->print(" %d", obj->short_field(offset())); 183 break; 184 case T_BOOLEAN: 185 as_int = obj->bool_field(offset()); 186 st->print(" %s", obj->bool_field(offset()) ? "true" : "false"); 187 break; 188 case T_ARRAY: 189 st->print(" "); 190 NOT_LP64(as_int = obj->int_field(offset())); 191 obj->obj_field(offset())->print_value_on(st); 192 break; 193 case T_OBJECT: 194 st->print(" "); 195 NOT_LP64(as_int = obj->int_field(offset())); 196 obj->obj_field(offset())->print_value_on(st); 197 break; 198 default: 199 ShouldNotReachHere(); 200 break; 201 } 202 // Print a hint as to the underlying integer representation. This can be wrong for 203 // pointers on an LP64 machine 204 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) { 205 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint))); 206 } else if (as_int < 0 || as_int > 9) { 207 st->print(" (%x)", as_int); 208 } 209 } 210 211 #endif /* PRODUCT */