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 "oops/valueKlass.hpp" 35 #include "runtime/fieldDescriptor.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 NULL; 60 } 61 62 AnnotationArray* fieldDescriptor::annotations() const { 63 InstanceKlass* ik = field_holder(); 64 Array<AnnotationArray*>* md = ik->fields_annotations(); 65 if (md == NULL) 66 return NULL; 67 return md->at(index()); 68 } 69 70 AnnotationArray* fieldDescriptor::type_annotations() const { 71 InstanceKlass* ik = field_holder(); 72 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations(); 73 if (type_annos == NULL) 74 return NULL; 75 return type_annos->at(index()); 76 } 77 78 constantTag fieldDescriptor::initial_value_tag() const { 79 return constants()->tag_at(initial_value_index()); 80 } 81 82 jint fieldDescriptor::int_initial_value() const { 83 return constants()->int_at(initial_value_index()); 84 } 85 86 jlong fieldDescriptor::long_initial_value() const { 87 return constants()->long_at(initial_value_index()); 88 } 89 90 jfloat fieldDescriptor::float_initial_value() const { 91 return constants()->float_at(initial_value_index()); 92 } 93 94 jdouble fieldDescriptor::double_initial_value() const { 95 return constants()->double_at(initial_value_index()); 96 } 97 98 oop fieldDescriptor::string_initial_value(TRAPS) const { 99 return constants()->uncached_string_at(initial_value_index(), THREAD); 100 } 101 102 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) { 103 if (_cp.is_null() || field_holder() != ik) { 104 _cp = constantPoolHandle(Thread::current(), ik->constants()); 105 // _cp should now reference ik's constant pool; i.e., ik is now field_holder. 106 assert(field_holder() == ik, "must be already initialized to this class"); 107 } 108 FieldInfo* f = ik->field(index); 109 assert(!f->is_internal(), "regular Java fields only"); 110 111 _access_flags = accessFlags_from(f->access_flags()); 112 guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor"); 113 _index = index; 114 verify(); 115 } 116 117 #ifndef PRODUCT 118 119 void fieldDescriptor::verify() const { 120 if (_cp.is_null()) { 121 assert(_index == badInt, "constructor must be called"); // see constructor 122 } else { 123 assert(_index >= 0, "good index"); 124 assert(_index < field_holder()->java_fields_count(), "oob"); 125 } 126 } 127 128 void fieldDescriptor::print_on(outputStream* st) const { 129 access_flags().print_on(st); 130 name()->print_value_on(st); 131 st->print(" "); 132 signature()->print_value_on(st); 133 st->print(" @%d ", offset()); 134 if (WizardMode && has_initial_value()) { 135 st->print("(initval "); 136 constantTag t = initial_value_tag(); 137 if (t.is_int()) { 138 st->print("int %d)", int_initial_value()); 139 } else if (t.is_long()){ 140 st->print_jlong(long_initial_value()); 141 } else if (t.is_float()){ 142 st->print("float %f)", float_initial_value()); 143 } else if (t.is_double()){ 144 st->print("double %lf)", double_initial_value()); 145 } 146 } 147 } 148 149 void fieldDescriptor::print_on_for(outputStream* st, oop obj) { 150 BasicType ft = field_type(); 151 if (ft != T_VALUETYPE) { 152 print_on(st); 153 } 154 jint as_int = 0; 155 switch (ft) { 156 case T_BYTE: 157 as_int = (jint)obj->byte_field(offset()); 158 st->print(" %d", obj->byte_field(offset())); 159 break; 160 case T_CHAR: 161 as_int = (jint)obj->char_field(offset()); 162 { 163 jchar c = obj->char_field(offset()); 164 as_int = c; 165 st->print(" %c %d", isprint(c) ? c : ' ', c); 166 } 167 break; 168 case T_DOUBLE: 169 st->print(" %lf", obj->double_field(offset())); 170 break; 171 case T_FLOAT: 172 as_int = obj->int_field(offset()); 173 st->print(" %f", obj->float_field(offset())); 174 break; 175 case T_INT: 176 as_int = obj->int_field(offset()); 177 st->print(" %d", obj->int_field(offset())); 178 break; 179 case T_LONG: 180 st->print(" "); 181 st->print_jlong(obj->long_field(offset())); 182 break; 183 case T_SHORT: 184 as_int = obj->short_field(offset()); 185 st->print(" %d", obj->short_field(offset())); 186 break; 187 case T_BOOLEAN: 188 as_int = obj->bool_field(offset()); 189 st->print(" %s", obj->bool_field(offset()) ? "true" : "false"); 190 break; 191 case T_ARRAY: 192 st->print(" "); 193 NOT_LP64(as_int = obj->int_field(offset())); 194 obj->obj_field(offset())->print_value_on(st); 195 break; 196 case T_OBJECT: 197 st->print(" "); 198 NOT_LP64(as_int = obj->int_field(offset())); 199 obj->obj_field(offset())->print_value_on(st); 200 break; 201 case T_VALUETYPE: 202 { 203 // Resolve klass of flattened value type field 204 Thread* THREAD = Thread::current(); 205 ResourceMark rm(THREAD); 206 SignatureStream ss(signature(), false); 207 Klass* k = ss.as_klass(Handle(THREAD, field_holder()->class_loader()), 208 Handle(THREAD, field_holder()->protection_domain()), 209 SignatureStream::ReturnNull, THREAD); 210 assert(k != NULL && !HAS_PENDING_EXCEPTION, "can resolve klass?"); 211 ValueKlass* vk = ValueKlass::cast(k); 212 int field_offset = offset() - vk->first_field_offset(); 213 obj = (oop)((address)obj + field_offset); 214 // Print flattened fields of the value type field 215 st->print_cr("Flattened value type '%s':", vk->name()->as_C_string()); 216 FieldPrinter print_field(st, obj); 217 vk->do_nonstatic_fields(&print_field); 218 return; // Do not print underlying representation 219 break; 220 } 221 default: 222 ShouldNotReachHere(); 223 break; 224 } 225 // Print a hint as to the underlying integer representation. This can be wrong for 226 // pointers on an LP64 machine 227 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) { 228 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint))); 229 } else if (as_int < 0 || as_int > 9) { 230 st->print(" (%x)", as_int); 231 } 232 st->cr(); 233 } 234 235 #endif /* PRODUCT */