1 /* 2 * Copyright (c) 1997, 2013, 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/fieldStreams.hpp" 33 #include "runtime/fieldDescriptor.hpp" 34 #include "runtime/handles.inline.hpp" 35 #include "runtime/signature.hpp" 36 37 38 oop fieldDescriptor::loader() const { 39 return _cp->pool_holder()->class_loader(); 40 } 41 42 Symbol* fieldDescriptor::generic_signature() const { 43 if (!has_generic_signature()) { 44 return NULL; 45 } 46 47 int idx = 0; 48 InstanceKlass* ik = field_holder(); 49 for (AllFieldStream fs(ik); !fs.done(); fs.next()) { 50 if (idx == _index) { 51 return fs.generic_signature(); 52 } else { 53 idx ++; 54 } 55 } 56 assert(false, "should never happen"); 57 return NULL; 58 } 59 60 AnnotationArray* fieldDescriptor::annotations() const { 61 InstanceKlass* ik = field_holder(); 62 Array<AnnotationArray*>* md = ik->fields_annotations(); 63 if (md == NULL) 64 return NULL; 65 return md->at(index()); 66 } 67 68 AnnotationArray* fieldDescriptor::type_annotations() const { 69 InstanceKlass* ik = field_holder(); 70 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations(); 71 if (type_annos == NULL) 72 return NULL; 73 return type_annos->at(index()); 74 } 75 76 constantTag fieldDescriptor::initial_value_tag() const { 77 return constants()->tag_at(initial_value_index()); 78 } 79 80 jint fieldDescriptor::int_initial_value() const { 81 return constants()->int_at(initial_value_index()); 82 } 83 84 jlong fieldDescriptor::long_initial_value() const { 85 return constants()->long_at(initial_value_index()); 86 } 87 88 jfloat fieldDescriptor::float_initial_value() const { 89 return constants()->float_at(initial_value_index()); 90 } 91 92 jdouble fieldDescriptor::double_initial_value() const { 93 return constants()->double_at(initial_value_index()); 94 } 95 96 oop fieldDescriptor::string_initial_value(TRAPS) const { 97 return constants()->uncached_string_at(initial_value_index(), CHECK_0); 98 } 99 100 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) { 101 if (_cp.is_null() || field_holder() != ik) { 102 _cp = constantPoolHandle(Thread::current(), ik->constants()); 103 // _cp should now reference ik's constant pool; i.e., ik is now field_holder. 104 assert(field_holder() == ik, "must be already initialized to this class"); 105 } 106 FieldInfo* f = ik->field(index); 107 assert(!f->is_internal(), "regular Java fields only"); 108 109 _access_flags = accessFlags_from(f->access_flags()); 110 guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor"); 111 _index = index; 112 verify(); 113 } 114 115 #ifndef PRODUCT 116 117 void fieldDescriptor::verify() const { 118 if (_cp.is_null()) { 119 assert(_index == badInt, "constructor must be called"); // see constructor 120 } else { 121 assert(_index >= 0, "good index"); 122 assert(_index < field_holder()->java_fields_count(), "oob"); 123 } 124 } 125 126 void fieldDescriptor::print_on(outputStream* st) const { 127 access_flags().print_on(st); 128 name()->print_value_on(st); 129 st->print(" "); 130 signature()->print_value_on(st); 131 st->print(" @%d ", offset()); 132 if (WizardMode && has_initial_value()) { 133 st->print("(initval "); 134 constantTag t = initial_value_tag(); 135 if (t.is_int()) { 136 st->print("int %d)", int_initial_value()); 137 } else if (t.is_long()){ 138 st->print_jlong(long_initial_value()); 139 } else if (t.is_float()){ 140 st->print("float %f)", float_initial_value()); 141 } else if (t.is_double()){ 142 st->print("double %lf)", double_initial_value()); 143 } 144 } 145 } 146 147 void fieldDescriptor::print_on_for(outputStream* st, oop obj) { 148 print_on(st); 149 BasicType ft = field_type(); 150 jint as_int = 0; 151 switch (ft) { 152 case T_BYTE: 153 as_int = (jint)obj->byte_field(offset()); 154 st->print(" %d", obj->byte_field(offset())); 155 break; 156 case T_CHAR: 157 as_int = (jint)obj->char_field(offset()); 158 { 159 jchar c = obj->char_field(offset()); 160 as_int = c; 161 st->print(" %c %d", isprint(c) ? c : ' ', c); 162 } 163 break; 164 case T_DOUBLE: 165 st->print(" %lf", obj->double_field(offset())); 166 break; 167 case T_FLOAT: 168 as_int = obj->int_field(offset()); 169 st->print(" %f", obj->float_field(offset())); 170 break; 171 case T_INT: 172 as_int = obj->int_field(offset()); 173 st->print(" %d", obj->int_field(offset())); 174 break; 175 case T_LONG: 176 st->print(" "); 177 st->print_jlong(obj->long_field(offset())); 178 break; 179 case T_SHORT: 180 as_int = obj->short_field(offset()); 181 st->print(" %d", obj->short_field(offset())); 182 break; 183 case T_BOOLEAN: 184 as_int = obj->bool_field(offset()); 185 st->print(" %s", obj->bool_field(offset()) ? "true" : "false"); 186 break; 187 case T_ARRAY: 188 st->print(" "); 189 NOT_LP64(as_int = obj->int_field(offset())); 190 obj->obj_field(offset())->print_value_on(st); 191 break; 192 case T_OBJECT: 193 st->print(" "); 194 NOT_LP64(as_int = obj->int_field(offset())); 195 obj->obj_field(offset())->print_value_on(st); 196 break; 197 default: 198 ShouldNotReachHere(); 199 break; 200 } 201 // Print a hint as to the underlying integer representation. This can be wrong for 202 // pointers on an LP64 machine 203 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) { 204 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint))); 205 } else if (as_int < 0 || as_int > 9) { 206 st->print(" (%x)", as_int); 207 } 208 } 209 210 #endif /* PRODUCT */