1 /* 2 * Copyright (c) 1997, 2010, 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/instanceKlass.hpp" 31 #include "oops/fieldStreams.hpp" 32 #include "runtime/fieldDescriptor.hpp" 33 #include "runtime/handles.inline.hpp" 34 #include "runtime/signature.hpp" 35 36 37 oop fieldDescriptor::loader() const { 38 return instanceKlass::cast(_cp->pool_holder())->class_loader(); 39 } 40 41 Symbol* fieldDescriptor::generic_signature() const { 42 if (!access_flags().field_has_generic_signature()) { 43 return NULL; 44 } 45 46 int idx = 0; 47 instanceKlass* ik = instanceKlass::cast(field_holder()); 48 for (AllFieldStream fs(ik); !fs.done(); fs.next()) { 49 if (idx == _index) { 50 return fs.generic_signature(); 51 } else { 52 idx ++; 53 } 54 } 55 assert(false, "should never happen"); 56 return NULL; 57 } 58 59 typeArrayOop fieldDescriptor::annotations() const { 60 instanceKlass* ik = instanceKlass::cast(field_holder()); 61 objArrayOop md = ik->fields_annotations(); 62 if (md == NULL) 63 return NULL; 64 return typeArrayOop(md->obj_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()->string_at(initial_value_index(), CHECK_0); 89 } 90 91 void fieldDescriptor::initialize(klassOop k, int index) { 92 instanceKlass* ik = instanceKlass::cast(k); 93 _cp = ik->constants(); 94 FieldInfo* f = ik->field(index); 95 assert(!f->is_internal(), "regular Java fields only"); 96 97 _access_flags = accessFlags_from(f->access_flags()); 98 guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor"); 99 _index = index; 100 } 101 102 #ifndef PRODUCT 103 104 void fieldDescriptor::print_on(outputStream* st) const { 105 access_flags().print_on(st); 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_on_for(outputStream* st, oop obj) { 126 print_on(st); 127 BasicType ft = field_type(); 128 jint as_int = 0; 129 switch (ft) { 130 case T_BYTE: 131 as_int = (jint)obj->byte_field(offset()); 132 st->print(" %d", obj->byte_field(offset())); 133 break; 134 case T_CHAR: 135 as_int = (jint)obj->char_field(offset()); 136 { 137 jchar c = obj->char_field(offset()); 138 as_int = c; 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 as_int = obj->int_field(offset()); 147 st->print(" %f", obj->float_field(offset())); 148 break; 149 case T_INT: 150 as_int = obj->int_field(offset()); 151 st->print(" %d", obj->int_field(offset())); 152 break; 153 case T_LONG: 154 st->print(" "); 155 st->print_jlong(obj->long_field(offset())); 156 break; 157 case T_SHORT: 158 as_int = obj->short_field(offset()); 159 st->print(" %d", obj->short_field(offset())); 160 break; 161 case T_BOOLEAN: 162 as_int = obj->bool_field(offset()); 163 st->print(" %s", obj->bool_field(offset()) ? "true" : "false"); 164 break; 165 case T_ARRAY: 166 st->print(" "); 167 NOT_LP64(as_int = obj->int_field(offset())); 168 obj->obj_field(offset())->print_value_on(st); 169 break; 170 case T_OBJECT: 171 st->print(" "); 172 NOT_LP64(as_int = obj->int_field(offset())); 173 obj->obj_field(offset())->print_value_on(st); 174 break; 175 default: 176 ShouldNotReachHere(); 177 break; 178 } 179 // Print a hint as to the underlying integer representation. This can be wrong for 180 // pointers on an LP64 machine 181 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) { 182 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint))); 183 } else if (as_int < 0 || as_int > 9) { 184 st->print(" (%x)", as_int); 185 } 186 } 187 188 #endif /* PRODUCT */