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 #include "precompiled.hpp"
25 #include "jvm.h"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/dictionary.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/verificationType.hpp"
39 #include "classfile/verifier.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.hpp"
44 #include "memory/metadataFactory.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "oops/annotations.hpp"
49 #include "oops/constantPool.inline.hpp"
50 #include "oops/fieldStreams.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/instanceMirrorKlass.hpp"
53 #include "oops/klass.inline.hpp"
54 #include "oops/klassVtable.hpp"
55 #include "oops/metadata.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/symbol.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/jvmtiThreadState.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/perfData.hpp"
66 #include "runtime/reflection.hpp"
67 #include "runtime/safepointVerifiers.hpp"
68 #include "runtime/signature.hpp"
69 #include "runtime/timer.hpp"
70 #include "services/classLoadingService.hpp"
71 #include "services/threadService.hpp"
72 #include "utilities/align.hpp"
73 #include "utilities/bitMap.inline.hpp"
74 #include "utilities/copy.hpp"
75 #include "utilities/exceptions.hpp"
76 #include "utilities/globalDefinitions.hpp"
77 #include "utilities/growableArray.hpp"
78 #include "utilities/macros.hpp"
79 #include "utilities/ostream.hpp"
80 #include "utilities/resourceHash.hpp"
81 #include "utilities/utf8.hpp"
110
111 // Used for backward compatibility reasons:
112 // - to disallow argument and require ACC_STATIC for <clinit> methods
113 #define JAVA_7_VERSION 51
114
115 // Extension method support.
116 #define JAVA_8_VERSION 52
117
118 #define JAVA_9_VERSION 53
119
120 #define JAVA_10_VERSION 54
121
122 #define JAVA_11_VERSION 55
123
124 #define JAVA_12_VERSION 56
125
126 #define JAVA_13_VERSION 57
127
128 #define JAVA_14_VERSION 58
129
130 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
131 assert((bad_constant == JVM_CONSTANT_Module ||
132 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
133 "Unexpected bad constant pool entry");
134 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
135 }
136
137 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
138 ConstantPool* cp,
139 const int length,
140 TRAPS) {
141 assert(stream != NULL, "invariant");
142 assert(cp != NULL, "invariant");
143
144 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
145 // this function (_current can be allocated in a register, with scalar
146 // replacement of aggregates). The _current pointer is copied back to
147 // stream() when this function returns. DON'T call another method within
148 // this method that uses stream().
149 const ClassFileStream cfs1 = *stream;
150 const ClassFileStream* const cfs = &cfs1;
151
152 assert(cfs->allocated_on_stack(), "should be local");
153 debug_only(const u1* const old_current = stream->current();)
154
155 // Used for batching symbol allocations.
156 const char* names[SymbolTable::symbol_alloc_batch_size];
157 int lengths[SymbolTable::symbol_alloc_batch_size];
158 int indices[SymbolTable::symbol_alloc_batch_size];
159 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
160 int names_count = 0;
161
162 // parsing Index 0 is unused
163 for (int index = 1; index < length; index++) {
164 // Each of the following case guarantees one more byte in the stream
165 // for the following tag or the access_flags following constant pool,
166 // so we don't need bounds-check for reading tag.
167 const u1 tag = cfs->get_u1_fast();
168 switch (tag) {
169 case JVM_CONSTANT_Class : {
170 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
171 const u2 name_index = cfs->get_u2_fast();
172 cp->klass_index_at_put(index, name_index);
173 break;
174 }
175 case JVM_CONSTANT_Fieldref: {
176 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
177 const u2 class_index = cfs->get_u2_fast();
178 const u2 name_and_type_index = cfs->get_u2_fast();
179 cp->field_at_put(index, class_index, name_and_type_index);
180 break;
181 }
182 case JVM_CONSTANT_Methodref: {
183 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
184 const u2 class_index = cfs->get_u2_fast();
185 const u2 name_and_type_index = cfs->get_u2_fast();
186 cp->method_at_put(index, class_index, name_and_type_index);
187 break;
188 }
189 case JVM_CONSTANT_InterfaceMethodref: {
479 check_property(valid_symbol_at(name_ref_index),
480 "Invalid constant pool index %u in class file %s",
481 name_ref_index, CHECK);
482 check_property(valid_symbol_at(signature_ref_index),
483 "Invalid constant pool index %u in class file %s",
484 signature_ref_index, CHECK);
485 break;
486 }
487 case JVM_CONSTANT_Utf8:
488 break;
489 case JVM_CONSTANT_UnresolvedClass: // fall-through
490 case JVM_CONSTANT_UnresolvedClassInError: {
491 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
492 break;
493 }
494 case JVM_CONSTANT_ClassIndex: {
495 const int class_index = cp->klass_index_at(index);
496 check_property(valid_symbol_at(class_index),
497 "Invalid constant pool index %u in class file %s",
498 class_index, CHECK);
499 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
500 break;
501 }
502 case JVM_CONSTANT_StringIndex: {
503 const int string_index = cp->string_index_at(index);
504 check_property(valid_symbol_at(string_index),
505 "Invalid constant pool index %u in class file %s",
506 string_index, CHECK);
507 Symbol* const sym = cp->symbol_at(string_index);
508 cp->unresolved_string_at_put(index, sym);
509 break;
510 }
511 case JVM_CONSTANT_MethodHandle: {
512 const int ref_index = cp->method_handle_index_at(index);
513 check_property(valid_cp_range(ref_index, length),
514 "Invalid constant pool index %u in class file %s",
515 ref_index, CHECK);
516 const constantTag tag = cp->tag_at(ref_index);
517 const int ref_kind = cp->method_handle_ref_kind_at(index);
518
519 switch (ref_kind) {
736 classfile_parse_error(
737 "Bad method name at constant pool index %u in class file %s",
738 name_ref_index, CHECK);
739 }
740 }
741 break;
742 }
743 case JVM_CONSTANT_MethodHandle: {
744 const int ref_index = cp->method_handle_index_at(index);
745 const int ref_kind = cp->method_handle_ref_kind_at(index);
746 switch (ref_kind) {
747 case JVM_REF_invokeVirtual:
748 case JVM_REF_invokeStatic:
749 case JVM_REF_invokeSpecial:
750 case JVM_REF_newInvokeSpecial: {
751 const int name_and_type_ref_index =
752 cp->name_and_type_ref_index_at(ref_index);
753 const int name_ref_index =
754 cp->name_ref_index_at(name_and_type_ref_index);
755 const Symbol* const name = cp->symbol_at(name_ref_index);
756 if (ref_kind == JVM_REF_newInvokeSpecial) {
757 if (name != vmSymbols::object_initializer_name()) {
758 classfile_parse_error(
759 "Bad constructor name at constant pool index %u in class file %s",
760 name_ref_index, CHECK);
761 }
762 } else {
763 if (name == vmSymbols::object_initializer_name()) {
764 classfile_parse_error(
765 "Bad method name at constant pool index %u in class file %s",
766 name_ref_index, CHECK);
767 }
768 }
769 break;
770 }
771 // Other ref_kinds are already fully checked in previous pass.
772 } // switch(ref_kind)
773 break;
774 }
775 case JVM_CONSTANT_MethodType: {
776 const Symbol* const no_name = vmSymbols::type_name(); // place holder
777 const Symbol* const signature = cp->method_type_signature_at(index);
778 verify_legal_method_signature(no_name, signature, CHECK);
779 break;
780 }
781 case JVM_CONSTANT_Utf8: {
782 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
783 }
1046 guarantee_property(value_type.is_int(),
1047 "Inconsistent constant value type in class file %s",
1048 CHECK);
1049 break;
1050 }
1051 case T_OBJECT: {
1052 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1053 && value_type.is_string()),
1054 "Bad string initial value in class file %s",
1055 CHECK);
1056 break;
1057 }
1058 default: {
1059 classfile_parse_error("Unable to set initial value %u in class file %s",
1060 constantvalue_index,
1061 CHECK);
1062 }
1063 }
1064 }
1065
1066 class AnnotationCollector : public ResourceObj{
1067 public:
1068 enum Location { _in_field, _in_method, _in_class };
1069 enum ID {
1070 _unknown = 0,
1071 _method_CallerSensitive,
1072 _method_ForceInline,
1073 _method_DontInline,
1074 _method_InjectedProfile,
1075 _method_LambdaForm_Compiled,
1076 _method_Hidden,
1077 _method_HotSpotIntrinsicCandidate,
1078 _jdk_internal_vm_annotation_Contended,
1079 _field_Stable,
1080 _jdk_internal_vm_annotation_ReservedStackAccess,
1081 _annotation_LIMIT
1082 };
1083 const Location _location;
1084 int _annotations_present;
1085 u2 _contended_group;
1086
1087 AnnotationCollector(Location location)
1088 : _location(location), _annotations_present(0)
1089 {
1090 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1091 }
1092 // If this annotation name has an ID, report it (or _none).
1093 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1094 // Set the annotation name:
1095 void set_annotation(ID id) {
1096 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1097 _annotations_present |= nth_bit((int)id);
1098 }
1099
1100 void remove_annotation(ID id) {
1101 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1102 _annotations_present &= ~nth_bit((int)id);
1103 }
1104
1105 // Report if the annotation is present.
1106 bool has_any_annotations() const { return _annotations_present != 0; }
1107 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1108
1109 void set_contended_group(u2 group) { _contended_group = group; }
1110 u2 contended_group() const { return _contended_group; }
1111
1112 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1113
1114 void set_stable(bool stable) { set_annotation(_field_Stable); }
1115 bool is_stable() const { return has_annotation(_field_Stable); }
1116 };
1117
1118 // This class also doubles as a holder for metadata cleanup.
1119 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1120 private:
1121 ClassLoaderData* _loader_data;
1122 AnnotationArray* _field_annotations;
1123 AnnotationArray* _field_type_annotations;
1124 public:
1125 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1126 AnnotationCollector(_in_field),
1127 _loader_data(loader_data),
1128 _field_annotations(NULL),
1129 _field_type_annotations(NULL) {}
1130 ~FieldAnnotationCollector();
1131 void apply_to(FieldInfo* f);
1132 AnnotationArray* field_annotations() { return _field_annotations; }
1133 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1134
1135 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1136 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1137 };
1138
1139 class MethodAnnotationCollector : public AnnotationCollector{
1140 public:
1141 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1142 void apply_to(const methodHandle& m);
1143 };
1144
1145 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1146 public:
1147 ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1148 void apply_to(InstanceKlass* ik);
1149 };
1150
1151
1152 static int skip_annotation_value(const u1*, int, int); // fwd decl
1153
1154 // Safely increment index by val if does not pass limit
1155 #define SAFE_ADD(index, limit, val) \
1156 if (index >= limit - val) return limit; \
1157 index += val;
1158
1159 // Skip an annotation. Return >=limit if there is any problem.
1160 static int skip_annotation(const u1* buffer, int limit, int index) {
1161 assert(buffer != NULL, "invariant");
1162 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1163 // value := switch (tag:u1) { ... }
1164 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1165 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1166 while (--nmem >= 0 && index < limit) {
1167 SAFE_ADD(index, limit, 2); // skip member
1168 index = skip_annotation_value(buffer, limit, index);
1169 }
1170 return index;
1448 CHECK);
1449 parsed_annotations->set_field_annotations(a);
1450 a = assemble_annotations(runtime_visible_type_annotations,
1451 runtime_visible_type_annotations_length,
1452 runtime_invisible_type_annotations,
1453 runtime_invisible_type_annotations_length,
1454 CHECK);
1455 parsed_annotations->set_field_type_annotations(a);
1456 return;
1457 }
1458
1459
1460 // Field allocation types. Used for computing field offsets.
1461
1462 enum FieldAllocationType {
1463 STATIC_OOP, // Oops
1464 STATIC_BYTE, // Boolean, Byte, char
1465 STATIC_SHORT, // shorts
1466 STATIC_WORD, // ints
1467 STATIC_DOUBLE, // aligned long or double
1468 NONSTATIC_OOP,
1469 NONSTATIC_BYTE,
1470 NONSTATIC_SHORT,
1471 NONSTATIC_WORD,
1472 NONSTATIC_DOUBLE,
1473 MAX_FIELD_ALLOCATION_TYPE,
1474 BAD_ALLOCATION_TYPE = -1
1475 };
1476
1477 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1478 BAD_ALLOCATION_TYPE, // 0
1479 BAD_ALLOCATION_TYPE, // 1
1480 BAD_ALLOCATION_TYPE, // 2
1481 BAD_ALLOCATION_TYPE, // 3
1482 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1483 NONSTATIC_SHORT, // T_CHAR = 5,
1484 NONSTATIC_WORD, // T_FLOAT = 6,
1485 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1486 NONSTATIC_BYTE, // T_BYTE = 8,
1487 NONSTATIC_SHORT, // T_SHORT = 9,
1488 NONSTATIC_WORD, // T_INT = 10,
1489 NONSTATIC_DOUBLE, // T_LONG = 11,
1490 NONSTATIC_OOP, // T_OBJECT = 12,
1491 NONSTATIC_OOP, // T_ARRAY = 13,
1492 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1493 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1494 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1495 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1496 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1497 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1498 BAD_ALLOCATION_TYPE, // 0
1499 BAD_ALLOCATION_TYPE, // 1
1500 BAD_ALLOCATION_TYPE, // 2
1501 BAD_ALLOCATION_TYPE, // 3
1502 STATIC_BYTE , // T_BOOLEAN = 4,
1503 STATIC_SHORT, // T_CHAR = 5,
1504 STATIC_WORD, // T_FLOAT = 6,
1505 STATIC_DOUBLE, // T_DOUBLE = 7,
1506 STATIC_BYTE, // T_BYTE = 8,
1507 STATIC_SHORT, // T_SHORT = 9,
1508 STATIC_WORD, // T_INT = 10,
1509 STATIC_DOUBLE, // T_LONG = 11,
1510 STATIC_OOP, // T_OBJECT = 12,
1511 STATIC_OOP, // T_ARRAY = 13,
1512 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1513 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1514 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1515 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1516 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1517 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1518 };
1519
1520 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1521 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1522 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1523 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1524 return result;
1525 }
1526
1527 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1528 public:
1529 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1530
1531 FieldAllocationCount() {
1532 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1533 count[i] = 0;
1534 }
1535 }
1536
1537 FieldAllocationType update(bool is_static, BasicType type) {
1538 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1539 if (atype != BAD_ALLOCATION_TYPE) {
1540 // Make sure there is no overflow with injected fields.
1541 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1542 count[atype]++;
1543 }
1544 return atype;
1545 }
1546 };
1547
1548 // Side-effects: populates the _fields, _fields_annotations,
1549 // _fields_type_annotations fields
1550 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1551 bool is_interface,
1552 FieldAllocationCount* const fac,
1553 ConstantPool* cp,
1554 const int cp_size,
1555 u2* const java_fields_count_ptr,
1556 TRAPS) {
1557
1558 assert(cfs != NULL, "invariant");
1559 assert(fac != NULL, "invariant");
1560 assert(cp != NULL, "invariant");
1561 assert(java_fields_count_ptr != NULL, "invariant");
1562
1563 assert(NULL == _fields, "invariant");
1564 assert(NULL == _fields_annotations, "invariant");
1565 assert(NULL == _fields_type_annotations, "invariant");
1566
1567 cfs->guarantee_more(2, CHECK); // length
1568 const u2 length = cfs->get_u2_fast();
1569 *java_fields_count_ptr = length;
1570
1571 int num_injected = 0;
1572 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1573 &num_injected);
1574 const int total_fields = length + num_injected;
1575
1576 // The field array starts with tuples of shorts
1577 // [access, name index, sig index, initial value index, byte offset].
1578 // A generic signature slot only exists for field with generic
1579 // signature attribute. And the access flag is set with
1580 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1581 // signature slots are at the end of the field array and after all
1582 // other fields data.
1583 //
1584 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1585 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1586 // ...
1587 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1588 // [generic signature index]
1589 // [generic signature index]
1590 // ...
1591 //
1592 // Allocate a temporary resource array for field data. For each field,
1593 // a slot is reserved in the temporary array for the generic signature
1594 // index. After parsing all fields, the data are copied to a permanent
1595 // array and any unused slots will be discarded.
1596 ResourceMark rm(THREAD);
1597 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1598 u2,
1599 total_fields * (FieldInfo::field_slots + 1));
1600
1601 // The generic signature slots start after all other fields' data.
1602 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1603 int num_generic_signature = 0;
1604 for (int n = 0; n < length; n++) {
1605 // access_flags, name_index, descriptor_index, attributes_count
1606 cfs->guarantee_more(8, CHECK);
1607
1608 AccessFlags access_flags;
1609 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1610 verify_legal_field_modifiers(flags, is_interface, CHECK);
1611 access_flags.set_flags(flags);
1612
1613 const u2 name_index = cfs->get_u2_fast();
1614 check_property(valid_symbol_at(name_index),
1615 "Invalid constant pool index %u for field name in class file %s",
1616 name_index, CHECK);
1617 const Symbol* const name = cp->symbol_at(name_index);
1618 verify_legal_field_name(name, CHECK);
1619
1620 const u2 signature_index = cfs->get_u2_fast();
1621 check_property(valid_symbol_at(signature_index),
1622 "Invalid constant pool index %u for field signature in class file %s",
1623 signature_index, CHECK);
1624 const Symbol* const sig = cp->symbol_at(signature_index);
1625 verify_legal_field_signature(name, sig, CHECK);
1626
1627 u2 constantvalue_index = 0;
1628 bool is_synthetic = false;
1629 u2 generic_signature_index = 0;
1630 const bool is_static = access_flags.is_static();
1631 FieldAnnotationCollector parsed_annotations(_loader_data);
1632
1633 const u2 attributes_count = cfs->get_u2_fast();
1634 if (attributes_count > 0) {
1635 parse_field_attributes(cfs,
1636 attributes_count,
1637 is_static,
1638 signature_index,
1639 &constantvalue_index,
1640 &is_synthetic,
1641 &generic_signature_index,
1642 &parsed_annotations,
1643 CHECK);
1644
1645 if (parsed_annotations.field_annotations() != NULL) {
1665
1666 if (is_synthetic) {
1667 access_flags.set_is_synthetic();
1668 }
1669 if (generic_signature_index != 0) {
1670 access_flags.set_field_has_generic_signature();
1671 fa[generic_signature_slot] = generic_signature_index;
1672 generic_signature_slot ++;
1673 num_generic_signature ++;
1674 }
1675 }
1676
1677 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1678 field->initialize(access_flags.as_short(),
1679 name_index,
1680 signature_index,
1681 constantvalue_index);
1682 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1683
1684 // Remember how many oops we encountered and compute allocation type
1685 const FieldAllocationType atype = fac->update(is_static, type);
1686 field->set_allocation_type(atype);
1687
1688 // After field is initialized with type, we can augment it with aux info
1689 if (parsed_annotations.has_any_annotations())
1690 parsed_annotations.apply_to(field);
1691 }
1692
1693 int index = length;
1694 if (num_injected != 0) {
1695 for (int n = 0; n < num_injected; n++) {
1696 // Check for duplicates
1697 if (injected[n].may_be_java) {
1698 const Symbol* const name = injected[n].name();
1699 const Symbol* const signature = injected[n].signature();
1700 bool duplicate = false;
1701 for (int i = 0; i < length; i++) {
1702 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1703 if (name == cp->symbol_at(f->name_index()) &&
1704 signature == cp->symbol_at(f->signature_index())) {
1705 // Symbol is desclared in Java so skip this one
1706 duplicate = true;
1707 break;
1708 }
1709 }
1710 if (duplicate) {
1711 // These will be removed from the field array at the end
1712 continue;
1713 }
1714 }
1715
1716 // Injected field
1717 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1718 field->initialize(JVM_ACC_FIELD_INTERNAL,
1719 injected[n].name_index,
1720 injected[n].signature_index,
1721 0);
1722
1723 const BasicType type = FieldType::basic_type(injected[n].signature());
1724
1725 // Remember how many oops we encountered and compute allocation type
1726 const FieldAllocationType atype = fac->update(false, type);
1727 field->set_allocation_type(atype);
1728 index++;
1729 }
1730 }
1731
1732 assert(NULL == _fields, "invariant");
1733
1734 _fields =
1735 MetadataFactory::new_array<u2>(_loader_data,
1736 index * FieldInfo::field_slots + num_generic_signature,
1737 CHECK);
1738 // Sometimes injected fields already exist in the Java source so
1739 // the fields array could be too long. In that case the
1740 // fields array is trimed. Also unused slots that were reserved
1741 // for generic signature indexes are discarded.
1742 {
1743 int i = 0;
1744 for (; i < index * FieldInfo::field_slots; i++) {
1745 _fields->at_put(i, fa[i]);
1746 }
1747 for (int j = total_fields * FieldInfo::field_slots;
1748 j < generic_signature_slot; j++) {
1749 _fields->at_put(i++, fa[j]);
1750 }
1751 assert(_fields->length() == i, "");
2027 "Exception name has bad type at constant pool %u in class file %s",
2028 checked_exception, CHECK_NULL);
2029 }
2030 }
2031 // check exceptions attribute length
2032 if (_need_verify) {
2033 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2034 sizeof(u2) * size),
2035 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2036 }
2037 return checked_exceptions_start;
2038 }
2039
2040 void ClassFileParser::throwIllegalSignature(const char* type,
2041 const Symbol* name,
2042 const Symbol* sig,
2043 TRAPS) const {
2044 assert(name != NULL, "invariant");
2045 assert(sig != NULL, "invariant");
2046
2047 ResourceMark rm(THREAD);
2048 Exceptions::fthrow(THREAD_AND_LOCATION,
2049 vmSymbols::java_lang_ClassFormatError(),
2050 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2051 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2052 }
2053
2054 AnnotationCollector::ID
2055 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2056 const Symbol* name) {
2057 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2058 // Privileged code can use all annotations. Other code silently drops some.
2059 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2060 loader_data->is_platform_class_loader_data() ||
2061 loader_data->is_unsafe_anonymous();
2062 switch (sid) {
2063 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2064 if (_location != _in_method) break; // only allow for methods
2065 if (!privileged) break; // only allow in privileged code
2066 return _method_CallerSensitive;
2067 }
2068 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2069 if (_location != _in_method) break; // only allow for methods
2070 if (!privileged) break; // only allow in privileged code
2071 return _method_ForceInline;
2295 runtime_visible_type_annotations_length,
2296 runtime_invisible_type_annotations,
2297 runtime_invisible_type_annotations_length,
2298 CHECK);
2299 cm->set_type_annotations(a);
2300 }
2301 }
2302
2303
2304 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2305 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2306 // Method* to save footprint, so we only know the size of the resulting Method* when the
2307 // entire method attribute is parsed.
2308 //
2309 // The promoted_flags parameter is used to pass relevant access_flags
2310 // from the method back up to the containing klass. These flag values
2311 // are added to klass's access_flags.
2312
2313 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2314 bool is_interface,
2315 const ConstantPool* cp,
2316 AccessFlags* const promoted_flags,
2317 TRAPS) {
2318 assert(cfs != NULL, "invariant");
2319 assert(cp != NULL, "invariant");
2320 assert(promoted_flags != NULL, "invariant");
2321
2322 ResourceMark rm(THREAD);
2323 // Parse fixed parts:
2324 // access_flags, name_index, descriptor_index, attributes_count
2325 cfs->guarantee_more(8, CHECK_NULL);
2326
2327 int flags = cfs->get_u2_fast();
2328 const u2 name_index = cfs->get_u2_fast();
2329 const int cp_size = cp->length();
2330 check_property(
2331 valid_symbol_at(name_index),
2332 "Illegal constant pool index %u for method name in class file %s",
2333 name_index, CHECK_NULL);
2334 const Symbol* const name = cp->symbol_at(name_index);
2335 verify_legal_method_name(name, CHECK_NULL);
2336
2337 const u2 signature_index = cfs->get_u2_fast();
2338 guarantee_property(
2339 valid_symbol_at(signature_index),
2340 "Illegal constant pool index %u for method signature in class file %s",
2341 signature_index, CHECK_NULL);
2342 const Symbol* const signature = cp->symbol_at(signature_index);
2343
2344 if (name == vmSymbols::class_initializer_name()) {
2345 // We ignore the other access flags for a valid class initializer.
2346 // (JVM Spec 2nd ed., chapter 4.6)
2347 if (_major_version < 51) { // backward compatibility
2348 flags = JVM_ACC_STATIC;
2349 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2350 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2351 } else {
2352 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2353 }
2354 } else {
2355 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2356 }
2357
2358 if (name == vmSymbols::object_initializer_name() && is_interface) {
2359 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2360 }
2361
2362 int args_size = -1; // only used when _need_verify is true
2363 if (_need_verify) {
2364 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2365 verify_legal_method_signature(name, signature, CHECK_NULL);
2366 if (args_size > MAX_ARGS_SIZE) {
2367 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2368 }
2369 }
2370
2371 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2372
2373 // Default values for code and exceptions attribute elements
2374 u2 max_stack = 0;
2375 u2 max_locals = 0;
2376 u4 code_length = 0;
2377 const u1* code_start = 0;
2378 u2 exception_table_length = 0;
2379 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2910 _has_finalizer = true;
2911 }
2912 }
2913 if (name == vmSymbols::object_initializer_name() &&
2914 signature == vmSymbols::void_method_signature() &&
2915 m->is_vanilla_constructor()) {
2916 _has_vanilla_constructor = true;
2917 }
2918
2919 NOT_PRODUCT(m->verify());
2920 return m;
2921 }
2922
2923
2924 // The promoted_flags parameter is used to pass relevant access_flags
2925 // from the methods back up to the containing klass. These flag values
2926 // are added to klass's access_flags.
2927 // Side-effects: populates the _methods field in the parser
2928 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2929 bool is_interface,
2930 AccessFlags* promoted_flags,
2931 bool* has_final_method,
2932 bool* declares_nonstatic_concrete_methods,
2933 TRAPS) {
2934 assert(cfs != NULL, "invariant");
2935 assert(promoted_flags != NULL, "invariant");
2936 assert(has_final_method != NULL, "invariant");
2937 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2938
2939 assert(NULL == _methods, "invariant");
2940
2941 cfs->guarantee_more(2, CHECK); // length
2942 const u2 length = cfs->get_u2_fast();
2943 if (length == 0) {
2944 _methods = Universe::the_empty_method_array();
2945 } else {
2946 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2947 length,
2948 NULL,
2949 CHECK);
2950
2951 for (int index = 0; index < length; index++) {
2952 Method* method = parse_method(cfs,
2953 is_interface,
2954 _cp,
2955 promoted_flags,
2956 CHECK);
2957
2958 if (method->is_final()) {
2959 *has_final_method = true;
2960 }
2961 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2962 // used for interface initialization, and default method inheritance analysis
2963 if (is_interface && !(*declares_nonstatic_concrete_methods)
2964 && !method->is_abstract() && !method->is_static()) {
2965 *declares_nonstatic_concrete_methods = true;
2966 }
2967 _methods->at_put(index, method);
2968 }
2969
2970 if (_need_verify && length > 1) {
2971 // Check duplicated methods
2972 ResourceMark rm(THREAD);
2973 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3126 valid_klass_reference_at(inner_class_info_index),
3127 "inner_class_info_index %u has bad constant type in class file %s",
3128 inner_class_info_index, CHECK_0);
3129 // Outer class index
3130 const u2 outer_class_info_index = cfs->get_u2_fast();
3131 check_property(
3132 outer_class_info_index == 0 ||
3133 valid_klass_reference_at(outer_class_info_index),
3134 "outer_class_info_index %u has bad constant type in class file %s",
3135 outer_class_info_index, CHECK_0);
3136 // Inner class name
3137 const u2 inner_name_index = cfs->get_u2_fast();
3138 check_property(
3139 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3140 "inner_name_index %u has bad constant type in class file %s",
3141 inner_name_index, CHECK_0);
3142 if (_need_verify) {
3143 guarantee_property(inner_class_info_index != outer_class_info_index,
3144 "Class is both outer and inner class in class file %s", CHECK_0);
3145 }
3146 // Access flags
3147 jint flags;
3148 // JVM_ACC_MODULE is defined in JDK-9 and later.
3149 if (_major_version >= JAVA_9_VERSION) {
3150 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3151 } else {
3152 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3153 }
3154 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3155 // Set abstract bit for old class files for backward compatibility
3156 flags |= JVM_ACC_ABSTRACT;
3157 }
3158 verify_legal_class_modifiers(flags, CHECK_0);
3159 AccessFlags inner_access_flags(flags);
3160
3161 inner_classes->at_put(index++, inner_class_info_index);
3162 inner_classes->at_put(index++, outer_class_info_index);
3163 inner_classes->at_put(index++, inner_name_index);
3164 inner_classes->at_put(index++, inner_access_flags.as_short());
3165 }
3166
3167 // 4347400: make sure there's no duplicate entry in the classes array
3168 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3169 for(int i = 0; i < length * 4; i += 4) {
3170 for(int j = i + 4; j < length * 4; j += 4) {
3171 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3172 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3173 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3336 u2 attributes_count = cfs->get_u2_fast();
3337 bool parsed_sourcefile_attribute = false;
3338 bool parsed_innerclasses_attribute = false;
3339 bool parsed_nest_members_attribute = false;
3340 bool parsed_nest_host_attribute = false;
3341 bool parsed_enclosingmethod_attribute = false;
3342 bool parsed_bootstrap_methods_attribute = false;
3343 const u1* runtime_visible_annotations = NULL;
3344 int runtime_visible_annotations_length = 0;
3345 const u1* runtime_invisible_annotations = NULL;
3346 int runtime_invisible_annotations_length = 0;
3347 const u1* runtime_visible_type_annotations = NULL;
3348 int runtime_visible_type_annotations_length = 0;
3349 const u1* runtime_invisible_type_annotations = NULL;
3350 int runtime_invisible_type_annotations_length = 0;
3351 bool runtime_invisible_type_annotations_exists = false;
3352 bool runtime_invisible_annotations_exists = false;
3353 bool parsed_source_debug_ext_annotations_exist = false;
3354 const u1* inner_classes_attribute_start = NULL;
3355 u4 inner_classes_attribute_length = 0;
3356 u2 enclosing_method_class_index = 0;
3357 u2 enclosing_method_method_index = 0;
3358 const u1* nest_members_attribute_start = NULL;
3359 u4 nest_members_attribute_length = 0;
3360
3361 // Iterate over attributes
3362 while (attributes_count--) {
3363 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3364 const u2 attribute_name_index = cfs->get_u2_fast();
3365 const u4 attribute_length = cfs->get_u4_fast();
3366 check_property(
3367 valid_symbol_at(attribute_name_index),
3368 "Attribute name has bad constant pool index %u in class file %s",
3369 attribute_name_index, CHECK);
3370 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3371 if (tag == vmSymbols::tag_source_file()) {
3372 // Check for SourceFile tag
3373 if (_need_verify) {
3374 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3375 }
3685 }
3686 }
3687 if (runtime_invisible_annotations != NULL) {
3688 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3689 int append = runtime_visible_annotations_length+i;
3690 annotations->at_put(append, runtime_invisible_annotations[i]);
3691 }
3692 }
3693 }
3694 return annotations;
3695 }
3696
3697 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3698 const int super_class_index,
3699 const bool need_verify,
3700 TRAPS) {
3701 assert(cp != NULL, "invariant");
3702 const InstanceKlass* super_klass = NULL;
3703
3704 if (super_class_index == 0) {
3705 check_property(_class_name == vmSymbols::java_lang_Object(),
3706 "Invalid superclass index %u in class file %s",
3707 super_class_index,
3708 CHECK_NULL);
3709 } else {
3710 check_property(valid_klass_reference_at(super_class_index),
3711 "Invalid superclass index %u in class file %s",
3712 super_class_index,
3713 CHECK_NULL);
3714 // The class name should be legal because it is checked when parsing constant pool.
3715 // However, make sure it is not an array type.
3716 bool is_array = false;
3717 if (cp->tag_at(super_class_index).is_klass()) {
3718 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3719 if (need_verify)
3720 is_array = super_klass->is_array_klass();
3721 } else if (need_verify) {
3722 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3723 }
3724 if (need_verify) {
3725 guarantee_property(!is_array,
3726 "Bad superclass name in class file %s", CHECK_NULL);
3727 }
3728 }
3729 return super_klass;
3730 }
3731
3732 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3733 unsigned int nonstatic_oop_map_count,
3734 int first_nonstatic_oop_offset) {
3735
3736 unsigned int map_count =
3737 NULL == super ? 0 : super->nonstatic_oop_map_count();
3738 if (nonstatic_oop_map_count > 0) {
3739 // We have oops to add to map
3740 if (map_count == 0) {
3741 map_count = nonstatic_oop_map_count;
3742 }
3743 else {
3744 // Check whether we should add a new map block or whether the last one can
3745 // be extended
3746 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3747 const OopMapBlock* const last_map = first_map + map_count - 1;
3748
3749 const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3750 if (next_offset == first_nonstatic_oop_offset) {
3751 // There is no gap bettwen superklass's last oop field and first
3752 // local oop field, merge maps.
3753 nonstatic_oop_map_count -= 1;
3754 }
3755 else {
3756 // Superklass didn't end with a oop field, add extra maps
3757 assert(next_offset < first_nonstatic_oop_offset, "just checking");
3758 }
3759 map_count += nonstatic_oop_map_count;
3760 }
3761 }
3762 return map_count;
3763 }
3764
3765 #ifndef PRODUCT
3766 static void print_field_layout(const Symbol* name,
3767 Array<u2>* fields,
3768 const constantPoolHandle& cp,
3769 int instance_size,
3770 int instance_fields_start,
3771 int instance_fields_end,
3772 int static_fields_end) {
3773
3774 assert(name != NULL, "invariant");
3775
3776 tty->print("%s: field layout\n", name->as_klass_external_name());
3777 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3778 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3779 if (!fs.access_flags().is_static()) {
3780 tty->print(" @%3d \"%s\" %s\n",
3781 fs.offset(),
3782 fs.name()->as_klass_external_name(),
3783 fs.signature()->as_klass_external_name());
3784 }
3785 }
3786 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3787 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3788 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3789 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3790 if (fs.access_flags().is_static()) {
3791 tty->print(" @%3d \"%s\" %s\n",
3792 fs.offset(),
3793 fs.name()->as_klass_external_name(),
3794 fs.signature()->as_klass_external_name());
3795 }
3796 }
3797 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3798 tty->print("\n");
3799 }
3800 #endif
3801
3802 // Values needed for oopmap and InstanceKlass creation
3803 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3804 public:
3805 int* nonstatic_oop_offsets;
3806 unsigned int* nonstatic_oop_counts;
3807 unsigned int nonstatic_oop_map_count;
3808 unsigned int total_oop_map_count;
3809 int instance_size;
3810 int nonstatic_field_size;
3811 int static_field_size;
3812 bool has_nonstatic_fields;
3813 };
3814
3815 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3816 void ClassFileParser::layout_fields(ConstantPool* cp,
3817 const FieldAllocationCount* fac,
3818 const ClassAnnotationCollector* parsed_annotations,
3819 FieldLayoutInfo* info,
3820 TRAPS) {
3821
3822 assert(cp != NULL, "invariant");
3823
3824 // Field size and offset computation
3825 int nonstatic_field_size = _super_klass == NULL ? 0 :
3826 _super_klass->nonstatic_field_size();
3827
3828 // Count the contended fields by type.
3829 //
3830 // We ignore static fields, because @Contended is not supported for them.
3831 // The layout code below will also ignore the static fields.
3832 int nonstatic_contended_count = 0;
3833 FieldAllocationCount fac_contended;
3834 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3835 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3836 if (fs.is_contended()) {
3837 fac_contended.count[atype]++;
3838 if (!fs.access_flags().is_static()) {
3839 nonstatic_contended_count++;
3840 }
3841 }
3842 }
3843
3844
3845 // Calculate the starting byte offsets
3846 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
3847 int next_static_double_offset = next_static_oop_offset +
3848 ((fac->count[STATIC_OOP]) * heapOopSize);
3849 if (fac->count[STATIC_DOUBLE]) {
3850 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
3851 }
3852
3853 int next_static_word_offset = next_static_double_offset +
3854 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3855 int next_static_short_offset = next_static_word_offset +
3856 ((fac->count[STATIC_WORD]) * BytesPerInt);
3857 int next_static_byte_offset = next_static_short_offset +
3858 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3859
3860 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
3861 nonstatic_field_size * heapOopSize;
3862
3863 int next_nonstatic_field_offset = nonstatic_fields_start;
3864
3865 const bool is_contended_class = parsed_annotations->is_contended();
3866
3867 // Class is contended, pad before all the fields
3868 if (is_contended_class) {
3869 next_nonstatic_field_offset += ContendedPaddingWidth;
3870 }
3871
3872 // Compute the non-contended fields count.
3873 // The packing code below relies on these counts to determine if some field
3874 // can be squeezed into the alignment gap. Contended fields are obviously
3875 // exempt from that.
3876 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3877 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
3878 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
3879 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
3880 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
3881
3882 // Total non-static fields count, including every contended field
3883 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3884 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3885 fac->count[NONSTATIC_OOP];
3886
3887 const bool super_has_nonstatic_fields =
3888 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3889 const bool has_nonstatic_fields =
3890 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3891
3892
3893 // Prepare list of oops for oop map generation.
3894 //
3895 // "offset" and "count" lists are describing the set of contiguous oop
3896 // regions. offset[i] is the start of the i-th region, which then has
3897 // count[i] oops following. Before we know how many regions are required,
3898 // we pessimistically allocate the maps to fit all the oops into the
3899 // distinct regions.
3900 //
3901 // TODO: We add +1 to always allocate non-zero resource arrays; we need
3902 // to figure out if we still need to do this.
3903 unsigned int nonstatic_oop_map_count = 0;
3904 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
3905
3906 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3907 THREAD, int, max_nonstatic_oop_maps);
3908 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
3909 THREAD, unsigned int, max_nonstatic_oop_maps);
3910
3911 int first_nonstatic_oop_offset = 0; // will be set for first oop field
3912
3913 bool compact_fields = CompactFields;
3914 int allocation_style = FieldsAllocationStyle;
3915 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3916 assert(false, "0 <= FieldsAllocationStyle <= 2");
3917 allocation_style = 1; // Optimistic
3918 }
3919
3920 // The next classes have predefined hard-coded fields offsets
3921 // (see in JavaClasses::compute_hard_coded_offsets()).
3922 // Use default fields allocation order for them.
3923 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3924 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3925 _class_name == vmSymbols::java_lang_Class() ||
3926 _class_name == vmSymbols::java_lang_ClassLoader() ||
3927 _class_name == vmSymbols::java_lang_ref_Reference() ||
3928 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3929 _class_name == vmSymbols::java_lang_StackTraceElement() ||
3938 _class_name == vmSymbols::java_lang_Integer() ||
3939 _class_name == vmSymbols::java_lang_Long())) {
3940 allocation_style = 0; // Allocate oops first
3941 compact_fields = false; // Don't compact fields
3942 }
3943
3944 int next_nonstatic_oop_offset = 0;
3945 int next_nonstatic_double_offset = 0;
3946
3947 // Rearrange fields for a given allocation style
3948 if( allocation_style == 0 ) {
3949 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3950 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3951 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3952 (nonstatic_oop_count * heapOopSize);
3953 } else if( allocation_style == 1 ) {
3954 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3955 next_nonstatic_double_offset = next_nonstatic_field_offset;
3956 } else if( allocation_style == 2 ) {
3957 // Fields allocation: oops fields in super and sub classes are together.
3958 if( nonstatic_field_size > 0 && _super_klass != NULL &&
3959 _super_klass->nonstatic_oop_map_size() > 0 ) {
3960 const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3961 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3962 const OopMapBlock* const last_map = first_map + map_count - 1;
3963 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3964 if (next_offset == next_nonstatic_field_offset) {
3965 allocation_style = 0; // allocate oops first
3966 next_nonstatic_oop_offset = next_nonstatic_field_offset;
3967 next_nonstatic_double_offset = next_nonstatic_oop_offset +
3968 (nonstatic_oop_count * heapOopSize);
3969 }
3970 }
3971 if( allocation_style == 2 ) {
3972 allocation_style = 1; // allocate oops last
3973 next_nonstatic_double_offset = next_nonstatic_field_offset;
3974 }
3975 } else {
3976 ShouldNotReachHere();
3977 }
3978
3979 int nonstatic_oop_space_count = 0;
3980 int nonstatic_word_space_count = 0;
3981 int nonstatic_short_space_count = 0;
3982 int nonstatic_byte_space_count = 0;
3983 int nonstatic_oop_space_offset = 0;
3984 int nonstatic_word_space_offset = 0;
4027 }
4028
4029 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4030 (nonstatic_double_count * BytesPerLong);
4031 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4032 (nonstatic_word_count * BytesPerInt);
4033 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4034 (nonstatic_short_count * BytesPerShort);
4035 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4036 nonstatic_byte_count;
4037
4038 // let oops jump before padding with this allocation style
4039 if( allocation_style == 1 ) {
4040 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4041 if( nonstatic_oop_count > 0 ) {
4042 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4043 }
4044 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4045 }
4046
4047 // Iterate over fields again and compute correct offsets.
4048 // The field allocation type was temporarily stored in the offset slot.
4049 // oop fields are located before non-oop fields (static and non-static).
4050 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4051
4052 // skip already laid out fields
4053 if (fs.is_offset_set()) continue;
4054
4055 // contended instance fields are handled below
4056 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4057
4058 int real_offset = 0;
4059 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4060
4061 // pack the rest of the fields
4062 switch (atype) {
4063 case STATIC_OOP:
4064 real_offset = next_static_oop_offset;
4065 next_static_oop_offset += heapOopSize;
4066 break;
4067 case STATIC_BYTE:
4068 real_offset = next_static_byte_offset;
4069 next_static_byte_offset += 1;
4070 break;
4071 case STATIC_SHORT:
4072 real_offset = next_static_short_offset;
4073 next_static_short_offset += BytesPerShort;
4074 break;
4075 case STATIC_WORD:
4076 real_offset = next_static_word_offset;
4077 next_static_word_offset += BytesPerInt;
4078 break;
4079 case STATIC_DOUBLE:
4080 real_offset = next_static_double_offset;
4081 next_static_double_offset += BytesPerLong;
4082 break;
4083 case NONSTATIC_OOP:
4084 if( nonstatic_oop_space_count > 0 ) {
4085 real_offset = nonstatic_oop_space_offset;
4086 nonstatic_oop_space_offset += heapOopSize;
4087 nonstatic_oop_space_count -= 1;
4088 } else {
4089 real_offset = next_nonstatic_oop_offset;
4090 next_nonstatic_oop_offset += heapOopSize;
4091 }
4092
4093 // Record this oop in the oop maps
4094 if( nonstatic_oop_map_count > 0 &&
4095 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4096 real_offset -
4097 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4098 heapOopSize ) {
4099 // This oop is adjacent to the previous one, add to current oop map
4100 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4101 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4102 } else {
4103 // This oop is not adjacent to the previous one, create new oop map
4104 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4105 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4106 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4107 nonstatic_oop_map_count += 1;
4108 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4109 first_nonstatic_oop_offset = real_offset;
4110 }
4111 }
4112 break;
4113 case NONSTATIC_BYTE:
4114 if( nonstatic_byte_space_count > 0 ) {
4115 real_offset = nonstatic_byte_space_offset;
4116 nonstatic_byte_space_offset += 1;
4117 nonstatic_byte_space_count -= 1;
4118 } else {
4119 real_offset = next_nonstatic_byte_offset;
4120 next_nonstatic_byte_offset += 1;
4121 }
4122 break;
4123 case NONSTATIC_SHORT:
4124 if( nonstatic_short_space_count > 0 ) {
4125 real_offset = nonstatic_short_space_offset;
4126 nonstatic_short_space_offset += BytesPerShort;
4127 nonstatic_short_space_count -= 1;
4128 } else {
4129 real_offset = next_nonstatic_short_offset;
4130 next_nonstatic_short_offset += BytesPerShort;
4131 }
4200 break;
4201
4202 case NONSTATIC_SHORT:
4203 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4204 real_offset = next_nonstatic_padded_offset;
4205 next_nonstatic_padded_offset += BytesPerShort;
4206 break;
4207
4208 case NONSTATIC_WORD:
4209 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4210 real_offset = next_nonstatic_padded_offset;
4211 next_nonstatic_padded_offset += BytesPerInt;
4212 break;
4213
4214 case NONSTATIC_DOUBLE:
4215 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4216 real_offset = next_nonstatic_padded_offset;
4217 next_nonstatic_padded_offset += BytesPerLong;
4218 break;
4219
4220 case NONSTATIC_OOP:
4221 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4222 real_offset = next_nonstatic_padded_offset;
4223 next_nonstatic_padded_offset += heapOopSize;
4224
4225 // Record this oop in the oop maps
4226 if( nonstatic_oop_map_count > 0 &&
4227 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4228 real_offset -
4229 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4230 heapOopSize ) {
4231 // This oop is adjacent to the previous one, add to current oop map
4232 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4233 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4234 } else {
4235 // This oop is not adjacent to the previous one, create new oop map
4236 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4237 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4238 nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4239 nonstatic_oop_map_count += 1;
4240 if( first_nonstatic_oop_offset == 0 ) { // Undefined
4241 first_nonstatic_oop_offset = real_offset;
4242 }
4243 }
4244 break;
4245
4246 default:
4247 ShouldNotReachHere();
4248 }
4249
4250 if (fs.contended_group() == 0) {
4251 // Contended group defines the equivalence class over the fields:
4252 // the fields within the same contended group are not inter-padded.
4253 // The only exception is default group, which does not incur the
4254 // equivalence, and so requires intra-padding.
4255 next_nonstatic_padded_offset += ContendedPaddingWidth;
4256 }
4257
4258 fs.set_offset(real_offset);
4259 } // for
4260
4261 // Start laying out the next group.
4262 // Note that this will effectively pad the last group in the back;
4263 // this is expected to alleviate memory contention effects for
4264 // subclass fields and/or adjacent object.
4265 // If this was the default group, the padding is already in place.
4266 if (current_group != 0) {
4267 next_nonstatic_padded_offset += ContendedPaddingWidth;
4268 }
4269 }
4270
4271 // handle static fields
4272 }
4273
4274 // Entire class is contended, pad in the back.
4275 // This helps to alleviate memory contention effects for subclass fields
4276 // and/or adjacent object.
4277 if (is_contended_class) {
4278 next_nonstatic_padded_offset += ContendedPaddingWidth;
4279 }
4280
4281 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4282
4283 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4284 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4285 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4286
4287 int static_field_size = (static_fields_end -
4288 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4289 nonstatic_field_size = nonstatic_field_size +
4290 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4291
4292 int instance_size = align_object_size(instance_end / wordSize);
4293
4294 assert(instance_size == align_object_size(align_up(
4295 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4296 wordSize) / wordSize), "consistent layout helper value");
4297
4298 // Invariant: nonstatic_field end/start should only change if there are
4299 // nonstatic fields in the class, or if the class is contended. We compare
4300 // against the non-aligned value, so that end alignment will not fail the
4301 // assert without actually having the fields.
4302 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4303 is_contended_class ||
4304 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4305
4306 // Number of non-static oop map blocks allocated at end of klass.
4307 const unsigned int total_oop_map_count =
4308 compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4309 first_nonstatic_oop_offset);
4310
4311 #ifndef PRODUCT
4312 if (PrintFieldLayout) {
4313 print_field_layout(_class_name,
4314 _fields,
4315 cp,
4316 instance_size,
4317 nonstatic_fields_start,
4318 nonstatic_fields_end,
4319 static_fields_end);
4320 }
4321
4322 #endif
4323 // Pass back information needed for InstanceKlass creation
4324 info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4325 info->nonstatic_oop_counts = nonstatic_oop_counts;
4326 info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4327 info->total_oop_map_count = total_oop_map_count;
4328 info->instance_size = instance_size;
4329 info->static_field_size = static_field_size;
4330 info->nonstatic_field_size = nonstatic_field_size;
4331 info->has_nonstatic_fields = has_nonstatic_fields;
4332 }
4333
4334 static void fill_oop_maps(const InstanceKlass* k,
4335 unsigned int nonstatic_oop_map_count,
4336 const int* nonstatic_oop_offsets,
4337 const unsigned int* nonstatic_oop_counts) {
4338
4339 assert(k != NULL, "invariant");
4340
4341 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4342 const InstanceKlass* const super = k->superklass();
4343 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4344 if (super_count > 0) {
4345 // Copy maps from superklass
4346 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4347 for (unsigned int i = 0; i < super_count; ++i) {
4348 *this_oop_map++ = *super_oop_map++;
4349 }
4350 }
4351
4352 if (nonstatic_oop_map_count > 0) {
4353 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4354 // The counts differ because there is no gap between superklass's last oop
4355 // field and the first local oop field. Extend the last oop map copied
4356 // from the superklass instead of creating new one.
4357 nonstatic_oop_map_count--;
4358 nonstatic_oop_offsets++;
4359 this_oop_map--;
4360 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4361 this_oop_map++;
4362 }
4363
4364 // Add new map blocks, fill them
4365 while (nonstatic_oop_map_count-- > 0) {
4366 this_oop_map->set_offset(*nonstatic_oop_offsets++);
4367 this_oop_map->set_count(*nonstatic_oop_counts++);
4368 this_oop_map++;
4369 }
4370 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4371 this_oop_map, "sanity");
4372 }
4373 }
4374
4375
4376 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4377 assert(ik != NULL, "invariant");
4378
4379 const Klass* const super = ik->super();
4380
4381 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4382 // in which case we don't have to register objects as finalizable
4383 if (!_has_empty_finalizer) {
4384 if (_has_finalizer ||
4385 (super != NULL && super->has_finalizer())) {
4386 ik->set_has_finalizer();
4387 }
4388 }
4389
4390 #ifdef ASSERT
4391 bool f = false;
4392 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4393 vmSymbols::void_method_signature());
4394 if (m != NULL && !m->is_empty_method()) {
4395 f = true;
4396 }
4397
4398 // Spec doesn't prevent agent from redefinition of empty finalizer.
4399 // Despite the fact that it's generally bad idea and redefined finalizer
4400 // will not work as expected we shouldn't abort vm in this case
4401 if (!ik->has_redefined_this_or_super()) {
4402 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4403 }
4404 #endif
4405
4406 // Check if this klass supports the java.lang.Cloneable interface
4407 if (SystemDictionary::Cloneable_klass_loaded()) {
4408 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4409 ik->set_is_cloneable();
4410 }
4411 }
4412
4413 // Check if this klass has a vanilla default constructor
4414 if (super == NULL) {
4415 // java.lang.Object has empty default constructor
4416 ik->set_has_vanilla_constructor();
4417 } else {
4418 if (super->has_vanilla_constructor() &&
4419 _has_vanilla_constructor) {
4420 ik->set_has_vanilla_constructor();
4421 }
4422 #ifdef ASSERT
4423 bool v = false;
4424 if (super->has_vanilla_constructor()) {
4425 const Method* const constructor =
4426 ik->find_method(vmSymbols::object_initializer_name(),
4427 vmSymbols::void_method_signature());
4428 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4429 v = true;
4430 }
4431 }
4432 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4433 #endif
4434 }
4435
4436 // If it cannot be fast-path allocated, set a bit in the layout helper.
4437 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4438 assert(ik->size_helper() > 0, "layout_helper is initialized");
4439 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4440 || ik->is_abstract() || ik->is_interface()
4441 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4442 || ik->size_helper() >= FastAllocateSizeLimit) {
4443 // Forbid fast-path allocation.
4444 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4445 ik->set_layout_helper(lh);
4446 }
4447 }
4448
4449 // utility methods for appending an array with check for duplicates
4450
4451 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4452 const Array<InstanceKlass*>* const ifs) {
4453 // iterate over new interfaces
4454 for (int i = 0; i < ifs->length(); i++) {
4455 InstanceKlass* const e = ifs->at(i);
4456 assert(e->is_klass() && e->is_interface(), "just checking");
4457 // add new interface
4458 result->append_if_missing(e);
4459 }
4460 }
4461
4462 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4463 Array<InstanceKlass*>* local_ifs,
4464 ClassLoaderData* loader_data,
4465 TRAPS) {
4466 assert(local_ifs != NULL, "invariant");
4467 assert(loader_data != NULL, "invariant");
4468
4691 const Method* const m = methods->at(index);
4692 // if m is static and not the init method, throw a verify error
4693 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4694 ResourceMark rm(THREAD);
4695 Exceptions::fthrow(
4696 THREAD_AND_LOCATION,
4697 vmSymbols::java_lang_VerifyError(),
4698 "Illegal static method %s in interface %s",
4699 m->name()->as_C_string(),
4700 this_klass->external_name()
4701 );
4702 return;
4703 }
4704 }
4705 }
4706
4707 // utility methods for format checking
4708
4709 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4710 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4711 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4712 if (is_module) {
4713 ResourceMark rm(THREAD);
4714 Exceptions::fthrow(
4715 THREAD_AND_LOCATION,
4716 vmSymbols::java_lang_NoClassDefFoundError(),
4717 "%s is not a class because access_flag ACC_MODULE is set",
4718 _class_name->as_C_string());
4719 return;
4720 }
4721
4722 if (!_need_verify) { return; }
4723
4724 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4725 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4726 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4727 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4728 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4729 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4730 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4731
4732 if ((is_abstract && is_final) ||
4733 (is_interface && !is_abstract) ||
4734 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4735 (!is_interface && major_gte_15 && is_annotation)) {
4736 ResourceMark rm(THREAD);
4737 Exceptions::fthrow(
4738 THREAD_AND_LOCATION,
4739 vmSymbols::java_lang_ClassFormatError(),
4740 "Illegal class modifiers in class %s: 0x%X",
4741 _class_name->as_C_string(), flags
4742 );
4743 return;
4744 }
4745 }
4746
4747 static bool has_illegal_visibility(jint flags) {
4748 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4749 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4750 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4751
4752 return ((is_public && is_protected) ||
4753 (is_public && is_private) ||
4754 (is_protected && is_private));
4755 }
4756
4757 // A legal major_version.minor_version must be one of the following:
4758 //
4759 // Major_version >= 45 and major_version < 56, any minor_version.
4760 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4761 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4800 if (!Arguments::enable_preview()) {
4801 Exceptions::fthrow(
4802 THREAD_AND_LOCATION,
4803 vmSymbols::java_lang_UnsupportedClassVersionError(),
4804 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4805 class_name->as_C_string(), major, minor);
4806 return;
4807 }
4808
4809 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4810 Exceptions::fthrow(
4811 THREAD_AND_LOCATION,
4812 vmSymbols::java_lang_UnsupportedClassVersionError(),
4813 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4814 class_name->as_C_string(), major, minor);
4815 }
4816 }
4817
4818 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4819 bool is_interface,
4820 TRAPS) const {
4821 if (!_need_verify) { return; }
4822
4823 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4824 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4825 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4826 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4827 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4828 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4829 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4830 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4831 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4832
4833 bool is_illegal = false;
4834
4835 if (is_interface) {
4836 if (!is_public || !is_static || !is_final || is_private ||
4837 is_protected || is_volatile || is_transient ||
4838 (major_gte_15 && is_enum)) {
4839 is_illegal = true;
4840 }
4841 } else { // not interface
4842 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4843 is_illegal = true;
4844 }
4845 }
4846
4847 if (is_illegal) {
4848 ResourceMark rm(THREAD);
4849 Exceptions::fthrow(
4850 THREAD_AND_LOCATION,
4851 vmSymbols::java_lang_ClassFormatError(),
4852 "Illegal field modifiers in class %s: 0x%X",
4853 _class_name->as_C_string(), flags);
4854 return;
4855 }
4856 }
4857
4858 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4859 bool is_interface,
4860 const Symbol* name,
4861 TRAPS) const {
4862 if (!_need_verify) { return; }
4863
4864 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4865 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4866 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4867 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4868 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4869 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4870 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4871 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4872 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4873 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4874 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4875 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4876 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4877
4878 bool is_illegal = false;
4879
4880 if (is_interface) {
4881 if (major_gte_8) {
4882 // Class file version is JAVA_8_VERSION or later Methods of
4883 // interfaces may set any of the flags except ACC_PROTECTED,
4884 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4885 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4886 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4887 (is_native || is_protected || is_final || is_synchronized) ||
4888 // If a specific method of a class or interface has its
4889 // ACC_ABSTRACT flag set, it must not have any of its
4890 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4891 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4892 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4893 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4894 (is_abstract && (is_private || is_static || is_strict))) {
4895 is_illegal = true;
4896 }
4897 } else if (major_gte_15) {
4898 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4899 if (!is_public || is_private || is_protected || is_static || is_final ||
4900 is_synchronized || is_native || !is_abstract || is_strict) {
4901 is_illegal = true;
4902 }
4903 } else {
4904 // Class file version is pre-JAVA_1_5_VERSION
4905 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4906 is_illegal = true;
4907 }
4908 }
4909 } else { // not interface
4910 if (has_illegal_visibility(flags)) {
4911 is_illegal = true;
4912 } else {
4913 if (is_initializer) {
4914 if (is_static || is_final || is_synchronized || is_native ||
4915 is_abstract || (major_gte_15 && is_bridge)) {
4916 is_illegal = true;
4917 }
4918 } else { // not initializer
4919 if (is_abstract) {
4920 if ((is_final || is_native || is_private || is_static ||
4921 (major_gte_15 && (is_synchronized || is_strict)))) {
4922 is_illegal = true;
4923 }
4924 }
4925 }
4926 }
4927 }
4928
4929 if (is_illegal) {
4930 ResourceMark rm(THREAD);
4931 Exceptions::fthrow(
4932 THREAD_AND_LOCATION,
4933 vmSymbols::java_lang_ClassFormatError(),
4934 "Method %s in class %s has illegal modifiers: 0x%X",
4935 name->as_C_string(), _class_name->as_C_string(), flags);
4936 return;
4937 }
4938 }
4939
4940 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4941 int length,
4942 TRAPS) const {
4943 assert(_need_verify, "only called when _need_verify is true");
4944 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4945 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4946 }
4947 }
4948
4949 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4950 // In class names, '/' separates unqualified names. This is verified in this function also.
4951 // Method names also may not contain the characters '<' or '>', unless <init>
4952 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4953 // method. Because these names have been checked as special cases before
4954 // calling this method in verify_legal_method_name.
4955 //
5072 // be taken as a field signature. Allow "void" if void_ok.
5073 // Return a pointer to just past the signature.
5074 // Return NULL if no legal signature is found.
5075 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5076 bool void_ok,
5077 unsigned int length,
5078 TRAPS) const {
5079 unsigned int array_dim = 0;
5080 while (length > 0) {
5081 switch (signature[0]) {
5082 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5083 case JVM_SIGNATURE_BOOLEAN:
5084 case JVM_SIGNATURE_BYTE:
5085 case JVM_SIGNATURE_CHAR:
5086 case JVM_SIGNATURE_SHORT:
5087 case JVM_SIGNATURE_INT:
5088 case JVM_SIGNATURE_FLOAT:
5089 case JVM_SIGNATURE_LONG:
5090 case JVM_SIGNATURE_DOUBLE:
5091 return signature + 1;
5092 case JVM_SIGNATURE_CLASS: {
5093 if (_major_version < JAVA_1_5_VERSION) {
5094 // Skip over the class name if one is there
5095 const char* const p = skip_over_field_name(signature + 1, true, --length);
5096
5097 // The next character better be a semicolon
5098 if (p && (p - signature) > 1 && p[0] == ';') {
5099 return p + 1;
5100 }
5101 }
5102 else {
5103 // Skip leading 'L' and ignore first appearance of ';'
5104 signature++;
5105 const char* c = (const char*) memchr(signature, ';', length - 1);
5106 // Format check signature
5107 if (c != NULL) {
5108 int newlen = c - (char*) signature;
5109 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5110 if (!legal) {
5111 classfile_parse_error("Class name is empty or contains illegal character "
5112 "in descriptor in class file %s",
5113 CHECK_0);
5114 return NULL;
5115 }
5116 return signature + newlen + 1;
5117 }
5118 }
5119 return NULL;
5120 }
5121 case JVM_SIGNATURE_ARRAY:
5122 array_dim++;
5123 if (array_dim > 255) {
5138
5139 // Checks if name is a legal class name.
5140 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5141 if (!_need_verify || _relax_verify) { return; }
5142
5143 assert(name->refcount() > 0, "symbol must be kept alive");
5144 char* bytes = (char*)name->bytes();
5145 unsigned int length = name->utf8_length();
5146 bool legal = false;
5147
5148 if (length > 0) {
5149 const char* p;
5150 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5151 p = skip_over_field_signature(bytes, false, length, CHECK);
5152 legal = (p != NULL) && ((p - bytes) == (int)length);
5153 } else if (_major_version < JAVA_1_5_VERSION) {
5154 if (bytes[0] != '<') {
5155 p = skip_over_field_name(bytes, true, length);
5156 legal = (p != NULL) && ((p - bytes) == (int)length);
5157 }
5158 } else {
5159 // 4900761: relax the constraints based on JSR202 spec
5160 // Class names may be drawn from the entire Unicode character set.
5161 // Identifiers between '/' must be unqualified names.
5162 // The utf8 string has been verified when parsing cpool entries.
5163 legal = verify_unqualified_name(bytes, length, LegalClass);
5164 }
5165 }
5166 if (!legal) {
5167 ResourceMark rm(THREAD);
5168 assert(_class_name != NULL, "invariant");
5169 Exceptions::fthrow(
5170 THREAD_AND_LOCATION,
5171 vmSymbols::java_lang_ClassFormatError(),
5172 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5173 _class_name->as_C_string()
5174 );
5175 return;
5176 }
5177 }
5287 const char* nextp;
5288
5289 // The first character must be a '('
5290 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5291 length--;
5292 // Skip over legal field signatures
5293 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5294 while ((length > 0) && (nextp != NULL)) {
5295 args_size++;
5296 if (p[0] == 'J' || p[0] == 'D') {
5297 args_size++;
5298 }
5299 length -= nextp - p;
5300 p = nextp;
5301 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5302 }
5303 // The first non-signature thing better be a ')'
5304 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5305 length--;
5306 if (name->utf8_length() > 0 && name->char_at(0) == '<') {
5307 // All internal methods must return void
5308 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5309 return args_size;
5310 }
5311 } else {
5312 // Now we better just have a return value
5313 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5314 if (nextp && ((int)length == (nextp - p))) {
5315 return args_size;
5316 }
5317 }
5318 }
5319 }
5320 // Report error
5321 throwIllegalSignature("Method", name, signature, CHECK_0);
5322 return 0;
5323 }
5324
5325 int ClassFileParser::static_field_size() const {
5326 assert(_field_info != NULL, "invariant");
5327 return _field_info->static_field_size;
5328 }
5329
5330 int ClassFileParser::total_oop_map_count() const {
5331 assert(_field_info != NULL, "invariant");
5332 return _field_info->total_oop_map_count;
5333 }
5334
5335 jint ClassFileParser::layout_size() const {
5336 assert(_field_info != NULL, "invariant");
5337 return _field_info->instance_size;
5338 }
5339
5340 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5341 const Array<Method*>* methods) {
5342 assert(ik != NULL, "invariant");
5343 assert(methods != NULL, "invariant");
5344
5345 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5346 // (We used to do this lazily, but now we query it in Rewriter,
5347 // which is eagerly done for every method, so we might as well do it now,
5348 // when everything is fresh in memory.)
5349 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5350
5351 if (klass_id != vmSymbols::NO_SID) {
5352 for (int j = 0; j < methods->length(); ++j) {
5442
5443
5444 if (ik->should_store_fingerprint()) {
5445 ik->store_fingerprint(_stream->compute_fingerprint());
5446 }
5447
5448 ik->set_has_passed_fingerprint_check(false);
5449 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5450 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5451 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5452 if (aot_fp != 0 && aot_fp == fp) {
5453 // This class matches with a class saved in an AOT library
5454 ik->set_has_passed_fingerprint_check(true);
5455 } else {
5456 ResourceMark rm;
5457 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5458 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5459 }
5460 }
5461
5462 return ik;
5463 }
5464
5465 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5466 assert(ik != NULL, "invariant");
5467
5468 // Set name and CLD before adding to CLD
5469 ik->set_class_loader_data(_loader_data);
5470 ik->set_name(_class_name);
5471
5472 // Add all classes to our internal class loader list here,
5473 // including classes in the bootstrap (NULL) class loader.
5474 const bool publicize = !is_internal();
5475
5476 _loader_data->add_class(ik, publicize);
5477
5478 set_klass_to_deallocate(ik);
5479
5480 assert(_field_info != NULL, "invariant");
5481 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5482 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5483 "sanity");
5484
5485 assert(ik->is_instance_klass(), "sanity");
5486 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5487
5488 // Fill in information already parsed
5489 ik->set_should_verify_class(_need_verify);
5490
5491 // Not yet: supers are done below to support the new subtype-checking fields
5492 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5493 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5494 assert(_fac != NULL, "invariant");
5495 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5496
5497 // this transfers ownership of a lot of arrays from
5498 // the parser onto the InstanceKlass*
5499 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5500
5501 // note that is not safe to use the fields in the parser from this point on
5502 assert(NULL == _cp, "invariant");
5503 assert(NULL == _fields, "invariant");
5504 assert(NULL == _methods, "invariant");
5505 assert(NULL == _inner_classes, "invariant");
5506 assert(NULL == _nest_members, "invariant");
5507 assert(NULL == _local_interfaces, "invariant");
5508 assert(NULL == _combined_annotations, "invariant");
5509
5510 if (_has_final_method) {
5511 ik->set_has_final_method();
5512 }
5513
5514 ik->copy_method_ordering(_method_ordering, CHECK);
5515 // The InstanceKlass::_methods_jmethod_ids cache
5563
5564 // Miranda methods
5565 if ((_num_miranda_methods > 0) ||
5566 // if this class introduced new miranda methods or
5567 (_super_klass != NULL && _super_klass->has_miranda_methods())
5568 // super class exists and this class inherited miranda methods
5569 ) {
5570 ik->set_has_miranda_methods(); // then set a flag
5571 }
5572
5573 // Fill in information needed to compute superclasses.
5574 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5575 ik->set_transitive_interfaces(_transitive_interfaces);
5576 _transitive_interfaces = NULL;
5577
5578 // Initialize itable offset tables
5579 klassItable::setup_itable_offset_table(ik);
5580
5581 // Compute transitive closure of interfaces this class implements
5582 // Do final class setup
5583 fill_oop_maps(ik,
5584 _field_info->nonstatic_oop_map_count,
5585 _field_info->nonstatic_oop_offsets,
5586 _field_info->nonstatic_oop_counts);
5587
5588 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5589 set_precomputed_flags(ik);
5590
5591 // check if this class can access its super class
5592 check_super_class_access(ik, CHECK);
5593
5594 // check if this class can access its superinterfaces
5595 check_super_interface_access(ik, CHECK);
5596
5597 // check if this class overrides any final method
5598 check_final_method_override(ik, CHECK);
5599
5600 // reject static interface methods prior to Java 8
5601 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5602 check_illegal_static_method(ik, CHECK);
5603 }
5604
5605 // Obtain this_klass' module entry
5606 ModuleEntry* module_entry = ik->module();
5607 assert(module_entry != NULL, "module_entry should always be set");
5608
5609 // Obtain java.lang.Module
5619
5620 assert(_all_mirandas != NULL, "invariant");
5621
5622 // Generate any default methods - default methods are public interface methods
5623 // that have a default implementation. This is new with Java 8.
5624 if (_has_nonstatic_concrete_methods) {
5625 DefaultMethods::generate_default_methods(ik,
5626 _all_mirandas,
5627 CHECK);
5628 }
5629
5630 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5631 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5632 !module_entry->has_default_read_edges()) {
5633 if (!module_entry->set_has_default_read_edges()) {
5634 // We won a potential race
5635 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5636 }
5637 }
5638
5639 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5640
5641 if (!is_internal()) {
5642 if (log_is_enabled(Info, class, load)) {
5643 ResourceMark rm;
5644 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5645 ik->print_class_load_logging(_loader_data, module_name, _stream);
5646 }
5647
5648 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5649 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5650 log_is_enabled(Info, class, preview)) {
5651 ResourceMark rm;
5652 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5653 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5654 }
5655
5656 if (log_is_enabled(Debug, class, resolve)) {
5657 ResourceMark rm;
5658 // print out the superclass.
5808 _protection_domain(protection_domain),
5809 _access_flags(),
5810 _pub_level(pub_level),
5811 _bad_constant_seen(0),
5812 _synthetic_flag(false),
5813 _sde_length(false),
5814 _sde_buffer(NULL),
5815 _sourcefile_index(0),
5816 _generic_signature_index(0),
5817 _major_version(0),
5818 _minor_version(0),
5819 _this_class_index(0),
5820 _super_class_index(0),
5821 _itfs_len(0),
5822 _java_fields_count(0),
5823 _need_verify(false),
5824 _relax_verify(false),
5825 _has_nonstatic_concrete_methods(false),
5826 _declares_nonstatic_concrete_methods(false),
5827 _has_final_method(false),
5828 _has_finalizer(false),
5829 _has_empty_finalizer(false),
5830 _has_vanilla_constructor(false),
5831 _max_bootstrap_specifier_index(-1) {
5832
5833 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5834 _class_name->increment_refcount();
5835
5836 assert(THREAD->is_Java_thread(), "invariant");
5837 assert(_loader_data != NULL, "invariant");
5838 assert(stream != NULL, "invariant");
5839 assert(_stream != NULL, "invariant");
5840 assert(_stream->buffer() == _stream->current(), "invariant");
5841 assert(_class_name != NULL, "invariant");
5842 assert(0 == _access_flags.as_int(), "invariant");
5843
5844 // Figure out whether we can skip format checking (matching classic VM behavior)
5845 if (DumpSharedSpaces) {
5846 // verify == true means it's a 'remote' class (i.e., non-boot class)
5847 // Verification decision is based on BytecodeVerificationRemote flag
6003
6004 _orig_cp_size = cp_size;
6005 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6006 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6007 }
6008 cp_size += _max_num_patched_klasses;
6009
6010 _cp = ConstantPool::allocate(_loader_data,
6011 cp_size,
6012 CHECK);
6013
6014 ConstantPool* const cp = _cp;
6015
6016 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6017
6018 assert(cp_size == (const u2)cp->length(), "invariant");
6019
6020 // ACCESS FLAGS
6021 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6022
6023 // Access flags
6024 jint flags;
6025 // JVM_ACC_MODULE is defined in JDK-9 and later.
6026 if (_major_version >= JAVA_9_VERSION) {
6027 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
6028 } else {
6029 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
6030 }
6031
6032 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6033 // Set abstract bit for old class files for backward compatibility
6034 flags |= JVM_ACC_ABSTRACT;
6035 }
6036
6037 verify_legal_class_modifiers(flags, CHECK);
6038
6039 short bad_constant = class_bad_constant_seen();
6040 if (bad_constant != 0) {
6041 // Do not throw CFE until after the access_flags are checked because if
6042 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6043 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6044 }
6045
6046 _access_flags.set_flags(flags);
6047
6048 // This class and superclass
6049 _this_class_index = stream->get_u2_fast();
6050 check_property(
6051 valid_cp_range(_this_class_index, cp_size) &&
6146 _super_class_index = stream->get_u2_fast();
6147 _super_klass = parse_super_class(cp,
6148 _super_class_index,
6149 _need_verify,
6150 CHECK);
6151
6152 // Interfaces
6153 _itfs_len = stream->get_u2_fast();
6154 parse_interfaces(stream,
6155 _itfs_len,
6156 cp,
6157 &_has_nonstatic_concrete_methods,
6158 CHECK);
6159
6160 assert(_local_interfaces != NULL, "invariant");
6161
6162 // Fields (offsets are filled in later)
6163 _fac = new FieldAllocationCount();
6164 parse_fields(stream,
6165 _access_flags.is_interface(),
6166 _fac,
6167 cp,
6168 cp_size,
6169 &_java_fields_count,
6170 CHECK);
6171
6172 assert(_fields != NULL, "invariant");
6173
6174 // Methods
6175 AccessFlags promoted_flags;
6176 parse_methods(stream,
6177 _access_flags.is_interface(),
6178 &promoted_flags,
6179 &_has_final_method,
6180 &_declares_nonstatic_concrete_methods,
6181 CHECK);
6182
6183 assert(_methods != NULL, "invariant");
6184
6185 // promote flags from parse_methods() to the klass' flags
6186 _access_flags.add_promoted_flags(promoted_flags.as_int());
6187
6188 if (_declares_nonstatic_concrete_methods) {
6189 _has_nonstatic_concrete_methods = true;
6190 }
6191
6192 // Additional attributes/annotations
6193 _parsed_annotations = new ClassAnnotationCollector();
6194 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6195
6196 assert(_inner_classes != NULL, "invariant");
6197
6239 true,
6240 CHECK);
6241 }
6242
6243 if (_super_klass != NULL) {
6244 if (_super_klass->has_nonstatic_concrete_methods()) {
6245 _has_nonstatic_concrete_methods = true;
6246 }
6247
6248 if (_super_klass->is_interface()) {
6249 ResourceMark rm(THREAD);
6250 Exceptions::fthrow(
6251 THREAD_AND_LOCATION,
6252 vmSymbols::java_lang_IncompatibleClassChangeError(),
6253 "class %s has interface %s as super class",
6254 _class_name->as_klass_external_name(),
6255 _super_klass->external_name()
6256 );
6257 return;
6258 }
6259 // Make sure super class is not final
6260 if (_super_klass->is_final()) {
6261 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6262 }
6263 }
6264
6265 // Compute the transitive list of all unique interfaces implemented by this class
6266 _transitive_interfaces =
6267 compute_transitive_interfaces(_super_klass,
6268 _local_interfaces,
6269 _loader_data,
6270 CHECK);
6271
6272 assert(_transitive_interfaces != NULL, "invariant");
6273
6274 // sort methods
6275 _method_ordering = sort_methods(_methods);
6276
6277 _all_mirandas = new GrowableArray<Method*>(20);
6278
6279 Handle loader(THREAD, _loader_data->class_loader());
6280 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6281 &_num_miranda_methods,
6282 _all_mirandas,
6283 _super_klass,
6284 _methods,
6285 _access_flags,
6286 _major_version,
6287 loader,
6288 _class_name,
6289 _local_interfaces,
6290 CHECK);
6291
6292 // Size of Java itable (in words)
6293 _itable_size = _access_flags.is_interface() ? 0 :
6294 klassItable::compute_itable_size(_transitive_interfaces);
6295
6296 assert(_fac != NULL, "invariant");
6297 assert(_parsed_annotations != NULL, "invariant");
6298
6299 _field_info = new FieldLayoutInfo();
6300 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6301
6302 // Compute reference typ
6303 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6304
6305 }
6306
6307 void ClassFileParser::set_klass(InstanceKlass* klass) {
6308
6309 #ifdef ASSERT
6310 if (klass != NULL) {
6311 assert(NULL == _klass, "leaking?");
6312 }
6313 #endif
6314
6315 _klass = klass;
6316 }
6317
6318 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6319
6320 #ifdef ASSERT
6321 if (klass != NULL) {
6322 assert(NULL == _klass_to_deallocate, "leaking?");
6323 }
6324 #endif
6325
6326 _klass_to_deallocate = klass;
6327 }
6328
6329 // Caller responsible for ResourceMark
6330 // clone stream with rewound position
6331 const ClassFileStream* ClassFileParser::clone_stream() const {
6332 assert(_stream != NULL, "invariant");
6333
6334 return _stream->clone();
6335 }
6336 // ----------------------------------------------------------------------------
6337 // debugging
6338
6339 #ifdef ASSERT
6340
6341 // return true if class_name contains no '.' (internal format is '/')
6342 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6343 if (class_name != NULL) {
6344 ResourceMark rm;
6345 char* name = class_name->as_C_string();
6346 return strchr(name, '.') == NULL;
6347 } else {
6348 return true;
6349 }
6350 }
6351
6352 #endif
|
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 "jvm.h"
27 #include "aot/aotLoader.hpp"
28 #include "classfile/classFileParser.hpp"
29 #include "classfile/classFileStream.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderData.inline.hpp"
32 #include "classfile/defaultMethods.hpp"
33 #include "classfile/dictionary.hpp"
34 #include <classfile/fieldLayoutBuilder.hpp>
35 #include "classfile/javaClasses.inline.hpp"
36 #include "classfile/moduleEntry.hpp"
37 #include "classfile/packageEntry.hpp"
38 #include "classfile/symbolTable.hpp"
39 #include "classfile/systemDictionary.hpp"
40 #include "classfile/verificationType.hpp"
41 #include "classfile/verifier.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/annotations.hpp"
51 #include "oops/constantPool.inline.hpp"
52 #include "oops/fieldStreams.hpp"
53 #include "oops/instanceKlass.hpp"
54 #include "oops/instanceMirrorKlass.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/klassVtable.hpp"
57 #include "oops/metadata.hpp"
58 #include "oops/method.inline.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "oops/symbol.hpp"
61 #include "oops/valueKlass.hpp"
62 #include "prims/jvmtiExport.hpp"
63 #include "prims/jvmtiThreadState.hpp"
64 #include "runtime/arguments.hpp"
65 #include "runtime/fieldDescriptor.inline.hpp"
66 #include "runtime/handles.inline.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/os.hpp"
69 #include "runtime/perfData.hpp"
70 #include "runtime/reflection.hpp"
71 #include "runtime/safepointVerifiers.hpp"
72 #include "runtime/signature.hpp"
73 #include "runtime/timer.hpp"
74 #include "services/classLoadingService.hpp"
75 #include "services/threadService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/bitMap.inline.hpp"
78 #include "utilities/copy.hpp"
79 #include "utilities/exceptions.hpp"
80 #include "utilities/globalDefinitions.hpp"
81 #include "utilities/growableArray.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/ostream.hpp"
84 #include "utilities/resourceHash.hpp"
85 #include "utilities/utf8.hpp"
114
115 // Used for backward compatibility reasons:
116 // - to disallow argument and require ACC_STATIC for <clinit> methods
117 #define JAVA_7_VERSION 51
118
119 // Extension method support.
120 #define JAVA_8_VERSION 52
121
122 #define JAVA_9_VERSION 53
123
124 #define JAVA_10_VERSION 54
125
126 #define JAVA_11_VERSION 55
127
128 #define JAVA_12_VERSION 56
129
130 #define JAVA_13_VERSION 57
131
132 #define JAVA_14_VERSION 58
133
134 #define CONSTANT_CLASS_DESCRIPTORS 58
135
136 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
137 assert((bad_constant == JVM_CONSTANT_Module ||
138 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
139 "Unexpected bad constant pool entry");
140 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
141 }
142
143 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
144 ConstantPool* cp,
145 const int length,
146 TRAPS) {
147 assert(stream != NULL, "invariant");
148 assert(cp != NULL, "invariant");
149
150 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
151 // this function (_current can be allocated in a register, with scalar
152 // replacement of aggregates). The _current pointer is copied back to
153 // stream() when this function returns. DON'T call another method within
154 // this method that uses stream().
155 const ClassFileStream cfs1 = *stream;
156 const ClassFileStream* const cfs = &cfs1;
157
158 assert(cfs->allocated_on_stack(), "should be local");
159 debug_only(const u1* const old_current = stream->current();)
160
161 // Used for batching symbol allocations.
162 const char* names[SymbolTable::symbol_alloc_batch_size];
163 int lengths[SymbolTable::symbol_alloc_batch_size];
164 int indices[SymbolTable::symbol_alloc_batch_size];
165 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
166 int names_count = 0;
167
168 // parsing Index 0 is unused
169 for (int index = 1; index < length; index++) {
170 // Each of the following case guarantees one more byte in the stream
171 // for the following tag or the access_flags following constant pool,
172 // so we don't need bounds-check for reading tag.
173 const u1 tag = cfs->get_u1_fast();
174 switch (tag) {
175 case JVM_CONSTANT_Class: {
176 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
177 const u2 name_index = cfs->get_u2_fast();
178 cp->klass_index_at_put(index, name_index);
179 break;
180 }
181 case JVM_CONSTANT_Fieldref: {
182 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
183 const u2 class_index = cfs->get_u2_fast();
184 const u2 name_and_type_index = cfs->get_u2_fast();
185 cp->field_at_put(index, class_index, name_and_type_index);
186 break;
187 }
188 case JVM_CONSTANT_Methodref: {
189 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
190 const u2 class_index = cfs->get_u2_fast();
191 const u2 name_and_type_index = cfs->get_u2_fast();
192 cp->method_at_put(index, class_index, name_and_type_index);
193 break;
194 }
195 case JVM_CONSTANT_InterfaceMethodref: {
485 check_property(valid_symbol_at(name_ref_index),
486 "Invalid constant pool index %u in class file %s",
487 name_ref_index, CHECK);
488 check_property(valid_symbol_at(signature_ref_index),
489 "Invalid constant pool index %u in class file %s",
490 signature_ref_index, CHECK);
491 break;
492 }
493 case JVM_CONSTANT_Utf8:
494 break;
495 case JVM_CONSTANT_UnresolvedClass: // fall-through
496 case JVM_CONSTANT_UnresolvedClassInError: {
497 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
498 break;
499 }
500 case JVM_CONSTANT_ClassIndex: {
501 const int class_index = cp->klass_index_at(index);
502 check_property(valid_symbol_at(class_index),
503 "Invalid constant pool index %u in class file %s",
504 class_index, CHECK);
505
506 Symbol* const name = cp->symbol_at(class_index);
507 const unsigned int name_len = name->utf8_length();
508 if (name->is_Q_signature()) {
509 cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
510 } else {
511 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
512 }
513 break;
514 }
515 case JVM_CONSTANT_StringIndex: {
516 const int string_index = cp->string_index_at(index);
517 check_property(valid_symbol_at(string_index),
518 "Invalid constant pool index %u in class file %s",
519 string_index, CHECK);
520 Symbol* const sym = cp->symbol_at(string_index);
521 cp->unresolved_string_at_put(index, sym);
522 break;
523 }
524 case JVM_CONSTANT_MethodHandle: {
525 const int ref_index = cp->method_handle_index_at(index);
526 check_property(valid_cp_range(ref_index, length),
527 "Invalid constant pool index %u in class file %s",
528 ref_index, CHECK);
529 const constantTag tag = cp->tag_at(ref_index);
530 const int ref_kind = cp->method_handle_ref_kind_at(index);
531
532 switch (ref_kind) {
749 classfile_parse_error(
750 "Bad method name at constant pool index %u in class file %s",
751 name_ref_index, CHECK);
752 }
753 }
754 break;
755 }
756 case JVM_CONSTANT_MethodHandle: {
757 const int ref_index = cp->method_handle_index_at(index);
758 const int ref_kind = cp->method_handle_ref_kind_at(index);
759 switch (ref_kind) {
760 case JVM_REF_invokeVirtual:
761 case JVM_REF_invokeStatic:
762 case JVM_REF_invokeSpecial:
763 case JVM_REF_newInvokeSpecial: {
764 const int name_and_type_ref_index =
765 cp->name_and_type_ref_index_at(ref_index);
766 const int name_ref_index =
767 cp->name_ref_index_at(name_and_type_ref_index);
768 const Symbol* const name = cp->symbol_at(name_ref_index);
769 if (name != vmSymbols::object_initializer_name()) {
770 if (ref_kind == JVM_REF_newInvokeSpecial) {
771 classfile_parse_error(
772 "Bad constructor name at constant pool index %u in class file %s",
773 name_ref_index, CHECK);
774 }
775 } else {
776 // The allowed invocation mode of <init> depends on its signature.
777 // This test corresponds to verify_invoke_instructions in the verifier.
778 const int signature_ref_index =
779 cp->signature_ref_index_at(name_and_type_ref_index);
780 const Symbol* const signature = cp->symbol_at(signature_ref_index);
781 if (signature->is_void_method_signature()
782 && ref_kind == JVM_REF_newInvokeSpecial) {
783 // OK, could be a constructor call
784 } else if (!signature->is_void_method_signature()
785 && ref_kind == JVM_REF_invokeStatic) {
786 // also OK, could be a static factory call
787 } else {
788 classfile_parse_error(
789 "Bad method name at constant pool index %u in class file %s",
790 name_ref_index, CHECK);
791 }
792 }
793 break;
794 }
795 // Other ref_kinds are already fully checked in previous pass.
796 } // switch(ref_kind)
797 break;
798 }
799 case JVM_CONSTANT_MethodType: {
800 const Symbol* const no_name = vmSymbols::type_name(); // place holder
801 const Symbol* const signature = cp->method_type_signature_at(index);
802 verify_legal_method_signature(no_name, signature, CHECK);
803 break;
804 }
805 case JVM_CONSTANT_Utf8: {
806 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
807 }
1070 guarantee_property(value_type.is_int(),
1071 "Inconsistent constant value type in class file %s",
1072 CHECK);
1073 break;
1074 }
1075 case T_OBJECT: {
1076 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1077 && value_type.is_string()),
1078 "Bad string initial value in class file %s",
1079 CHECK);
1080 break;
1081 }
1082 default: {
1083 classfile_parse_error("Unable to set initial value %u in class file %s",
1084 constantvalue_index,
1085 CHECK);
1086 }
1087 }
1088 }
1089
1090 // This class also doubles as a holder for metadata cleanup.
1091 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1092 private:
1093 ClassLoaderData* _loader_data;
1094 AnnotationArray* _field_annotations;
1095 AnnotationArray* _field_type_annotations;
1096 public:
1097 FieldAnnotationCollector(ClassLoaderData* loader_data) :
1098 AnnotationCollector(_in_field),
1099 _loader_data(loader_data),
1100 _field_annotations(NULL),
1101 _field_type_annotations(NULL) {}
1102 ~FieldAnnotationCollector();
1103 void apply_to(FieldInfo* f);
1104 AnnotationArray* field_annotations() { return _field_annotations; }
1105 AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1106
1107 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
1108 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1109 };
1110
1111 class MethodAnnotationCollector : public AnnotationCollector{
1112 public:
1113 MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1114 void apply_to(const methodHandle& m);
1115 };
1116
1117
1118 static int skip_annotation_value(const u1*, int, int); // fwd decl
1119
1120 // Safely increment index by val if does not pass limit
1121 #define SAFE_ADD(index, limit, val) \
1122 if (index >= limit - val) return limit; \
1123 index += val;
1124
1125 // Skip an annotation. Return >=limit if there is any problem.
1126 static int skip_annotation(const u1* buffer, int limit, int index) {
1127 assert(buffer != NULL, "invariant");
1128 // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1129 // value := switch (tag:u1) { ... }
1130 SAFE_ADD(index, limit, 4); // skip atype and read nmem
1131 int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1132 while (--nmem >= 0 && index < limit) {
1133 SAFE_ADD(index, limit, 2); // skip member
1134 index = skip_annotation_value(buffer, limit, index);
1135 }
1136 return index;
1414 CHECK);
1415 parsed_annotations->set_field_annotations(a);
1416 a = assemble_annotations(runtime_visible_type_annotations,
1417 runtime_visible_type_annotations_length,
1418 runtime_invisible_type_annotations,
1419 runtime_invisible_type_annotations_length,
1420 CHECK);
1421 parsed_annotations->set_field_type_annotations(a);
1422 return;
1423 }
1424
1425
1426 // Field allocation types. Used for computing field offsets.
1427
1428 enum FieldAllocationType {
1429 STATIC_OOP, // Oops
1430 STATIC_BYTE, // Boolean, Byte, char
1431 STATIC_SHORT, // shorts
1432 STATIC_WORD, // ints
1433 STATIC_DOUBLE, // aligned long or double
1434 STATIC_FLATTENABLE, // flattenable field
1435 NONSTATIC_OOP,
1436 NONSTATIC_BYTE,
1437 NONSTATIC_SHORT,
1438 NONSTATIC_WORD,
1439 NONSTATIC_DOUBLE,
1440 NONSTATIC_FLATTENABLE,
1441 MAX_FIELD_ALLOCATION_TYPE,
1442 BAD_ALLOCATION_TYPE = -1
1443 };
1444
1445 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1446 BAD_ALLOCATION_TYPE, // 0
1447 BAD_ALLOCATION_TYPE, // 1
1448 BAD_ALLOCATION_TYPE, // 2
1449 BAD_ALLOCATION_TYPE, // 3
1450 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1451 NONSTATIC_SHORT, // T_CHAR = 5,
1452 NONSTATIC_WORD, // T_FLOAT = 6,
1453 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1454 NONSTATIC_BYTE, // T_BYTE = 8,
1455 NONSTATIC_SHORT, // T_SHORT = 9,
1456 NONSTATIC_WORD, // T_INT = 10,
1457 NONSTATIC_DOUBLE, // T_LONG = 11,
1458 NONSTATIC_OOP, // T_OBJECT = 12,
1459 NONSTATIC_OOP, // T_ARRAY = 13,
1460 NONSTATIC_OOP, // T_VALUETYPE = 14,
1461 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1462 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1463 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1464 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1465 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1466 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1467 BAD_ALLOCATION_TYPE, // 0
1468 BAD_ALLOCATION_TYPE, // 1
1469 BAD_ALLOCATION_TYPE, // 2
1470 BAD_ALLOCATION_TYPE, // 3
1471 STATIC_BYTE , // T_BOOLEAN = 4,
1472 STATIC_SHORT, // T_CHAR = 5,
1473 STATIC_WORD, // T_FLOAT = 6,
1474 STATIC_DOUBLE, // T_DOUBLE = 7,
1475 STATIC_BYTE, // T_BYTE = 8,
1476 STATIC_SHORT, // T_SHORT = 9,
1477 STATIC_WORD, // T_INT = 10,
1478 STATIC_DOUBLE, // T_LONG = 11,
1479 STATIC_OOP, // T_OBJECT = 12,
1480 STATIC_OOP, // T_ARRAY = 13,
1481 STATIC_OOP, // T_VALUETYPE = 14,
1482 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1483 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1484 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1485 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1486 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1487 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1488 };
1489
1490 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) {
1491 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1492 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1493 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1494 if (is_flattenable) {
1495 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE;
1496 }
1497 return result;
1498 }
1499
1500 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1501 public:
1502 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1503
1504 FieldAllocationCount() {
1505 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1506 count[i] = 0;
1507 }
1508 }
1509
1510 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) {
1511 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable);
1512 if (atype != BAD_ALLOCATION_TYPE) {
1513 // Make sure there is no overflow with injected fields.
1514 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1515 count[atype]++;
1516 }
1517 return atype;
1518 }
1519 };
1520
1521 // Side-effects: populates the _fields, _fields_annotations,
1522 // _fields_type_annotations fields
1523 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1524 bool is_interface,
1525 bool is_value_type,
1526 FieldAllocationCount* const fac,
1527 ConstantPool* cp,
1528 const int cp_size,
1529 u2* const java_fields_count_ptr,
1530 TRAPS) {
1531
1532 assert(cfs != NULL, "invariant");
1533 assert(fac != NULL, "invariant");
1534 assert(cp != NULL, "invariant");
1535 assert(java_fields_count_ptr != NULL, "invariant");
1536
1537 assert(NULL == _fields, "invariant");
1538 assert(NULL == _fields_annotations, "invariant");
1539 assert(NULL == _fields_type_annotations, "invariant");
1540
1541 cfs->guarantee_more(2, CHECK); // length
1542 const u2 length = cfs->get_u2_fast();
1543 *java_fields_count_ptr = length;
1544
1545 int num_injected = 0;
1546 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1547 &num_injected);
1548
1549 // two more slots are required for inline classes:
1550 // one for the static field with a reference to the pre-allocated default value
1551 // one for the field the JVM injects when detecting an empty inline class
1552 const int total_fields = length + num_injected + (is_value_type ? 2 : 0);
1553
1554 // The field array starts with tuples of shorts
1555 // [access, name index, sig index, initial value index, byte offset].
1556 // A generic signature slot only exists for field with generic
1557 // signature attribute. And the access flag is set with
1558 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1559 // signature slots are at the end of the field array and after all
1560 // other fields data.
1561 //
1562 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1563 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1564 // ...
1565 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1566 // [generic signature index]
1567 // [generic signature index]
1568 // ...
1569 //
1570 // Allocate a temporary resource array for field data. For each field,
1571 // a slot is reserved in the temporary array for the generic signature
1572 // index. After parsing all fields, the data are copied to a permanent
1573 // array and any unused slots will be discarded.
1574 ResourceMark rm(THREAD);
1575 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1576 u2,
1577 total_fields * (FieldInfo::field_slots + 1));
1578
1579 // The generic signature slots start after all other fields' data.
1580 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1581 int num_generic_signature = 0;
1582 int instance_fields_count = 0;
1583 for (int n = 0; n < length; n++) {
1584 // access_flags, name_index, descriptor_index, attributes_count
1585 cfs->guarantee_more(8, CHECK);
1586
1587 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1588
1589 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1590 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK);
1591 AccessFlags access_flags;
1592 access_flags.set_flags(flags);
1593
1594 const u2 name_index = cfs->get_u2_fast();
1595 check_property(valid_symbol_at(name_index),
1596 "Invalid constant pool index %u for field name in class file %s",
1597 name_index, CHECK);
1598 const Symbol* const name = cp->symbol_at(name_index);
1599 verify_legal_field_name(name, CHECK);
1600
1601 const u2 signature_index = cfs->get_u2_fast();
1602 check_property(valid_symbol_at(signature_index),
1603 "Invalid constant pool index %u for field signature in class file %s",
1604 signature_index, CHECK);
1605 const Symbol* const sig = cp->symbol_at(signature_index);
1606 verify_legal_field_signature(name, sig, CHECK);
1607 assert(!access_flags.is_flattenable(), "ACC_FLATTENABLE should have been filtered out");
1608 if (sig->is_Q_signature()) {
1609 // assert(_major_version >= CONSTANT_CLASS_DESCRIPTORS, "Q-descriptors are only supported in recent classfiles");
1610 access_flags.set_is_flattenable();
1611 }
1612 if (access_flags.is_flattenable()) {
1613 // Array flattenability cannot be specified. Arrays of value classes are
1614 // are always flattenable. Arrays of other classes are not flattenable.
1615 if (sig->utf8_length() > 1 && sig->char_at(0) == '[') {
1616 classfile_parse_error(
1617 "Field \"%s\" with signature \"%s\" in class file %s is invalid."
1618 " ACC_FLATTENABLE cannot be specified for an array",
1619 name->as_C_string(), sig->as_klass_external_name(), CHECK);
1620 }
1621 _has_flattenable_fields = true;
1622 }
1623 if (!access_flags.is_static()) instance_fields_count++;
1624
1625 u2 constantvalue_index = 0;
1626 bool is_synthetic = false;
1627 u2 generic_signature_index = 0;
1628 const bool is_static = access_flags.is_static();
1629 FieldAnnotationCollector parsed_annotations(_loader_data);
1630
1631 const u2 attributes_count = cfs->get_u2_fast();
1632 if (attributes_count > 0) {
1633 parse_field_attributes(cfs,
1634 attributes_count,
1635 is_static,
1636 signature_index,
1637 &constantvalue_index,
1638 &is_synthetic,
1639 &generic_signature_index,
1640 &parsed_annotations,
1641 CHECK);
1642
1643 if (parsed_annotations.field_annotations() != NULL) {
1663
1664 if (is_synthetic) {
1665 access_flags.set_is_synthetic();
1666 }
1667 if (generic_signature_index != 0) {
1668 access_flags.set_field_has_generic_signature();
1669 fa[generic_signature_slot] = generic_signature_index;
1670 generic_signature_slot ++;
1671 num_generic_signature ++;
1672 }
1673 }
1674
1675 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1676 field->initialize(access_flags.as_short(),
1677 name_index,
1678 signature_index,
1679 constantvalue_index);
1680 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1681
1682 // Remember how many oops we encountered and compute allocation type
1683 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable());
1684 field->set_allocation_type(atype);
1685
1686 // After field is initialized with type, we can augment it with aux info
1687 if (parsed_annotations.has_any_annotations())
1688 parsed_annotations.apply_to(field);
1689 }
1690
1691 int index = length;
1692 if (num_injected != 0) {
1693 for (int n = 0; n < num_injected; n++) {
1694 // Check for duplicates
1695 if (injected[n].may_be_java) {
1696 const Symbol* const name = injected[n].name();
1697 const Symbol* const signature = injected[n].signature();
1698 bool duplicate = false;
1699 for (int i = 0; i < length; i++) {
1700 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1701 if (name == cp->symbol_at(f->name_index()) &&
1702 signature == cp->symbol_at(f->signature_index())) {
1703 // Symbol is desclared in Java so skip this one
1704 duplicate = true;
1705 break;
1706 }
1707 }
1708 if (duplicate) {
1709 // These will be removed from the field array at the end
1710 continue;
1711 }
1712 }
1713
1714 // Injected field
1715 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1716 field->initialize(JVM_ACC_FIELD_INTERNAL,
1717 injected[n].name_index,
1718 injected[n].signature_index,
1719 0);
1720
1721 const BasicType type = FieldType::basic_type(injected[n].signature());
1722
1723 // Remember how many oops we encountered and compute allocation type
1724 const FieldAllocationType atype = fac->update(false, type, false);
1725 field->set_allocation_type(atype);
1726 index++;
1727 }
1728 }
1729
1730 if (is_value_type) {
1731 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1732 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1733 vmSymbols::default_value_name_enum,
1734 vmSymbols::java_lang_Object_enum,
1735 0);
1736 const BasicType type = FieldType::basic_type(vmSymbols::object_signature());
1737 const FieldAllocationType atype = fac->update(true, type, false);
1738 field->set_allocation_type(atype);
1739 index++;
1740 }
1741
1742 if (is_value_type && instance_fields_count == 0) {
1743 _is_empty_value = true;
1744 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1745 field->initialize(JVM_ACC_FIELD_INTERNAL,
1746 vmSymbols::empty_marker_name_enum,
1747 vmSymbols::byte_signature_enum,
1748 0);
1749 const BasicType type = FieldType::basic_type(vmSymbols::byte_signature());
1750 const FieldAllocationType atype = fac->update(false, type, false);
1751 field->set_allocation_type(atype);
1752 index++;
1753 }
1754
1755 assert(NULL == _fields, "invariant");
1756
1757 _fields =
1758 MetadataFactory::new_array<u2>(_loader_data,
1759 index * FieldInfo::field_slots + num_generic_signature,
1760 CHECK);
1761 // Sometimes injected fields already exist in the Java source so
1762 // the fields array could be too long. In that case the
1763 // fields array is trimed. Also unused slots that were reserved
1764 // for generic signature indexes are discarded.
1765 {
1766 int i = 0;
1767 for (; i < index * FieldInfo::field_slots; i++) {
1768 _fields->at_put(i, fa[i]);
1769 }
1770 for (int j = total_fields * FieldInfo::field_slots;
1771 j < generic_signature_slot; j++) {
1772 _fields->at_put(i++, fa[j]);
1773 }
1774 assert(_fields->length() == i, "");
2050 "Exception name has bad type at constant pool %u in class file %s",
2051 checked_exception, CHECK_NULL);
2052 }
2053 }
2054 // check exceptions attribute length
2055 if (_need_verify) {
2056 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2057 sizeof(u2) * size),
2058 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2059 }
2060 return checked_exceptions_start;
2061 }
2062
2063 void ClassFileParser::throwIllegalSignature(const char* type,
2064 const Symbol* name,
2065 const Symbol* sig,
2066 TRAPS) const {
2067 assert(name != NULL, "invariant");
2068 assert(sig != NULL, "invariant");
2069
2070 const char* class_note = "";
2071 if (is_value_type() && name == vmSymbols::object_initializer_name()) {
2072 class_note = " (an inline class)";
2073 }
2074
2075 ResourceMark rm(THREAD);
2076 Exceptions::fthrow(THREAD_AND_LOCATION,
2077 vmSymbols::java_lang_ClassFormatError(),
2078 "%s \"%s\" in class %s%s has illegal signature \"%s\"", type,
2079 name->as_C_string(), _class_name->as_C_string(), class_note, sig->as_C_string());
2080 }
2081
2082 AnnotationCollector::ID
2083 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2084 const Symbol* name) {
2085 const vmSymbols::SID sid = vmSymbols::find_sid(name);
2086 // Privileged code can use all annotations. Other code silently drops some.
2087 const bool privileged = loader_data->is_the_null_class_loader_data() ||
2088 loader_data->is_platform_class_loader_data() ||
2089 loader_data->is_unsafe_anonymous();
2090 switch (sid) {
2091 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2092 if (_location != _in_method) break; // only allow for methods
2093 if (!privileged) break; // only allow in privileged code
2094 return _method_CallerSensitive;
2095 }
2096 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2097 if (_location != _in_method) break; // only allow for methods
2098 if (!privileged) break; // only allow in privileged code
2099 return _method_ForceInline;
2323 runtime_visible_type_annotations_length,
2324 runtime_invisible_type_annotations,
2325 runtime_invisible_type_annotations_length,
2326 CHECK);
2327 cm->set_type_annotations(a);
2328 }
2329 }
2330
2331
2332 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2333 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2334 // Method* to save footprint, so we only know the size of the resulting Method* when the
2335 // entire method attribute is parsed.
2336 //
2337 // The promoted_flags parameter is used to pass relevant access_flags
2338 // from the method back up to the containing klass. These flag values
2339 // are added to klass's access_flags.
2340
2341 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2342 bool is_interface,
2343 bool is_value_type,
2344 const ConstantPool* cp,
2345 AccessFlags* const promoted_flags,
2346 TRAPS) {
2347 assert(cfs != NULL, "invariant");
2348 assert(cp != NULL, "invariant");
2349 assert(promoted_flags != NULL, "invariant");
2350
2351 ResourceMark rm(THREAD);
2352 // Parse fixed parts:
2353 // access_flags, name_index, descriptor_index, attributes_count
2354 cfs->guarantee_more(8, CHECK_NULL);
2355
2356 int flags = cfs->get_u2_fast();
2357 const u2 name_index = cfs->get_u2_fast();
2358 const int cp_size = cp->length();
2359 check_property(
2360 valid_symbol_at(name_index),
2361 "Illegal constant pool index %u for method name in class file %s",
2362 name_index, CHECK_NULL);
2363 const Symbol* const name = cp->symbol_at(name_index);
2364 verify_legal_method_name(name, CHECK_NULL);
2365
2366 const u2 signature_index = cfs->get_u2_fast();
2367 guarantee_property(
2368 valid_symbol_at(signature_index),
2369 "Illegal constant pool index %u for method signature in class file %s",
2370 signature_index, CHECK_NULL);
2371 const Symbol* const signature = cp->symbol_at(signature_index);
2372
2373 if (name == vmSymbols::class_initializer_name()) {
2374 // We ignore the other access flags for a valid class initializer.
2375 // (JVM Spec 2nd ed., chapter 4.6)
2376 if (_major_version < 51) { // backward compatibility
2377 flags = JVM_ACC_STATIC;
2378 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2379 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2380 } else {
2381 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2382 }
2383 } else {
2384 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL);
2385 }
2386
2387 if (name == vmSymbols::object_initializer_name()) {
2388 if (is_interface) {
2389 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2390 } else if (!is_value_type && signature->is_void_method_signature()) {
2391 // OK, a constructor
2392 } else if (is_value_type && !signature->is_void_method_signature()) {
2393 // also OK, a static factory, as long as the return value is good
2394 bool ok = false;
2395 SignatureStream ss((Symbol*) signature, true);
2396 while (!ss.at_return_type()) ss.next();
2397 if (ss.is_object()) {
2398 TempNewSymbol ret = ss.as_symbol_or_null();
2399 const Symbol* required = class_name();
2400 if (is_unsafe_anonymous()) {
2401 // The original class name in the UAC byte stream gets changed. So
2402 // using the original name in the return type is no longer valid.
2403 required = vmSymbols::java_lang_Object();
2404 }
2405 ok = (ret == required);
2406 }
2407 if (!ok) {
2408 throwIllegalSignature("Method", name, signature, CHECK_0);
2409 }
2410 } else {
2411 // not OK, so throw the same error as in verify_legal_method_signature.
2412 throwIllegalSignature("Method", name, signature, CHECK_0);
2413 }
2414 // A declared <init> method must always be either a non-static
2415 // object constructor, with a void return, or else it must be a
2416 // static factory method, with a non-void return. No other
2417 // definition of <init> is possible.
2418 //
2419 // The verifier (in verify_invoke_instructions) will inspect the
2420 // signature of any attempt to invoke <init>, and ensures that it
2421 // returns non-void if and only if it is being invoked by
2422 // invokestatic, and void if and only if it is being invoked by
2423 // invokespecial.
2424 //
2425 // When a symbolic reference to <init> is resolved for a
2426 // particular invocation mode (special or static), the mode is
2427 // matched to the JVM_ACC_STATIC modifier of the <init> method.
2428 // Thus, it is impossible to statically invoke a constructor, and
2429 // impossible to "new + invokespecial" a static factory, either
2430 // through bytecode or through reflection.
2431 }
2432
2433 int args_size = -1; // only used when _need_verify is true
2434 if (_need_verify) {
2435 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2436 verify_legal_method_signature(name, signature, CHECK_NULL);
2437 if (args_size > MAX_ARGS_SIZE) {
2438 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2439 }
2440 }
2441
2442 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2443
2444 // Default values for code and exceptions attribute elements
2445 u2 max_stack = 0;
2446 u2 max_locals = 0;
2447 u4 code_length = 0;
2448 const u1* code_start = 0;
2449 u2 exception_table_length = 0;
2450 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2981 _has_finalizer = true;
2982 }
2983 }
2984 if (name == vmSymbols::object_initializer_name() &&
2985 signature == vmSymbols::void_method_signature() &&
2986 m->is_vanilla_constructor()) {
2987 _has_vanilla_constructor = true;
2988 }
2989
2990 NOT_PRODUCT(m->verify());
2991 return m;
2992 }
2993
2994
2995 // The promoted_flags parameter is used to pass relevant access_flags
2996 // from the methods back up to the containing klass. These flag values
2997 // are added to klass's access_flags.
2998 // Side-effects: populates the _methods field in the parser
2999 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
3000 bool is_interface,
3001 bool is_value_type,
3002 AccessFlags* promoted_flags,
3003 bool* has_final_method,
3004 bool* declares_nonstatic_concrete_methods,
3005 TRAPS) {
3006 assert(cfs != NULL, "invariant");
3007 assert(promoted_flags != NULL, "invariant");
3008 assert(has_final_method != NULL, "invariant");
3009 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
3010
3011 assert(NULL == _methods, "invariant");
3012
3013 cfs->guarantee_more(2, CHECK); // length
3014 const u2 length = cfs->get_u2_fast();
3015 if (length == 0) {
3016 _methods = Universe::the_empty_method_array();
3017 } else {
3018 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3019 length,
3020 NULL,
3021 CHECK);
3022
3023 for (int index = 0; index < length; index++) {
3024 Method* method = parse_method(cfs,
3025 is_interface,
3026 is_value_type,
3027 _cp,
3028 promoted_flags,
3029 CHECK);
3030
3031 if (method->is_final()) {
3032 *has_final_method = true;
3033 }
3034 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3035 // used for interface initialization, and default method inheritance analysis
3036 if (is_interface && !(*declares_nonstatic_concrete_methods)
3037 && !method->is_abstract() && !method->is_static()) {
3038 *declares_nonstatic_concrete_methods = true;
3039 }
3040 _methods->at_put(index, method);
3041 }
3042
3043 if (_need_verify && length > 1) {
3044 // Check duplicated methods
3045 ResourceMark rm(THREAD);
3046 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3199 valid_klass_reference_at(inner_class_info_index),
3200 "inner_class_info_index %u has bad constant type in class file %s",
3201 inner_class_info_index, CHECK_0);
3202 // Outer class index
3203 const u2 outer_class_info_index = cfs->get_u2_fast();
3204 check_property(
3205 outer_class_info_index == 0 ||
3206 valid_klass_reference_at(outer_class_info_index),
3207 "outer_class_info_index %u has bad constant type in class file %s",
3208 outer_class_info_index, CHECK_0);
3209 // Inner class name
3210 const u2 inner_name_index = cfs->get_u2_fast();
3211 check_property(
3212 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3213 "inner_name_index %u has bad constant type in class file %s",
3214 inner_name_index, CHECK_0);
3215 if (_need_verify) {
3216 guarantee_property(inner_class_info_index != outer_class_info_index,
3217 "Class is both outer and inner class in class file %s", CHECK_0);
3218 }
3219
3220 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3221 // JVM_ACC_MODULE is defined in JDK-9 and later.
3222 if (_major_version >= JAVA_9_VERSION) {
3223 recognized_modifiers |= JVM_ACC_MODULE;
3224 }
3225 // JVM_ACC_VALUE is defined for class file version 55 and later
3226 if (supports_value_types()) {
3227 recognized_modifiers |= JVM_ACC_VALUE;
3228 }
3229
3230 // Access flags
3231 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3232
3233 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3234 // Set abstract bit for old class files for backward compatibility
3235 flags |= JVM_ACC_ABSTRACT;
3236 }
3237 verify_legal_class_modifiers(flags, CHECK_0);
3238 AccessFlags inner_access_flags(flags);
3239
3240 inner_classes->at_put(index++, inner_class_info_index);
3241 inner_classes->at_put(index++, outer_class_info_index);
3242 inner_classes->at_put(index++, inner_name_index);
3243 inner_classes->at_put(index++, inner_access_flags.as_short());
3244 }
3245
3246 // 4347400: make sure there's no duplicate entry in the classes array
3247 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3248 for(int i = 0; i < length * 4; i += 4) {
3249 for(int j = i + 4; j < length * 4; j += 4) {
3250 guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
3251 inner_classes->at(i+1) != inner_classes->at(j+1) ||
3252 inner_classes->at(i+2) != inner_classes->at(j+2) ||
3415 u2 attributes_count = cfs->get_u2_fast();
3416 bool parsed_sourcefile_attribute = false;
3417 bool parsed_innerclasses_attribute = false;
3418 bool parsed_nest_members_attribute = false;
3419 bool parsed_nest_host_attribute = false;
3420 bool parsed_enclosingmethod_attribute = false;
3421 bool parsed_bootstrap_methods_attribute = false;
3422 const u1* runtime_visible_annotations = NULL;
3423 int runtime_visible_annotations_length = 0;
3424 const u1* runtime_invisible_annotations = NULL;
3425 int runtime_invisible_annotations_length = 0;
3426 const u1* runtime_visible_type_annotations = NULL;
3427 int runtime_visible_type_annotations_length = 0;
3428 const u1* runtime_invisible_type_annotations = NULL;
3429 int runtime_invisible_type_annotations_length = 0;
3430 bool runtime_invisible_type_annotations_exists = false;
3431 bool runtime_invisible_annotations_exists = false;
3432 bool parsed_source_debug_ext_annotations_exist = false;
3433 const u1* inner_classes_attribute_start = NULL;
3434 u4 inner_classes_attribute_length = 0;
3435 const u1* value_types_attribute_start = NULL;
3436 u4 value_types_attribute_length = 0;
3437 u2 enclosing_method_class_index = 0;
3438 u2 enclosing_method_method_index = 0;
3439 const u1* nest_members_attribute_start = NULL;
3440 u4 nest_members_attribute_length = 0;
3441
3442 // Iterate over attributes
3443 while (attributes_count--) {
3444 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3445 const u2 attribute_name_index = cfs->get_u2_fast();
3446 const u4 attribute_length = cfs->get_u4_fast();
3447 check_property(
3448 valid_symbol_at(attribute_name_index),
3449 "Attribute name has bad constant pool index %u in class file %s",
3450 attribute_name_index, CHECK);
3451 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3452 if (tag == vmSymbols::tag_source_file()) {
3453 // Check for SourceFile tag
3454 if (_need_verify) {
3455 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3456 }
3766 }
3767 }
3768 if (runtime_invisible_annotations != NULL) {
3769 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3770 int append = runtime_visible_annotations_length+i;
3771 annotations->at_put(append, runtime_invisible_annotations[i]);
3772 }
3773 }
3774 }
3775 return annotations;
3776 }
3777
3778 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3779 const int super_class_index,
3780 const bool need_verify,
3781 TRAPS) {
3782 assert(cp != NULL, "invariant");
3783 const InstanceKlass* super_klass = NULL;
3784
3785 if (super_class_index == 0) {
3786 check_property(_class_name == vmSymbols::java_lang_Object()
3787 || (_access_flags.get_flags() & JVM_ACC_VALUE),
3788 "Invalid superclass index %u in class file %s",
3789 super_class_index,
3790 CHECK_NULL);
3791 } else {
3792 check_property(valid_klass_reference_at(super_class_index),
3793 "Invalid superclass index %u in class file %s",
3794 super_class_index,
3795 CHECK_NULL);
3796 // The class name should be legal because it is checked when parsing constant pool.
3797 // However, make sure it is not an array type.
3798 bool is_array = false;
3799 if (cp->tag_at(super_class_index).is_klass()) {
3800 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3801 if (need_verify)
3802 is_array = super_klass->is_array_klass();
3803 } else if (need_verify) {
3804 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3805 }
3806 if (need_verify) {
3807 guarantee_property(!is_array,
3808 "Bad superclass name in class file %s", CHECK_NULL);
3809 }
3810 }
3811 return super_klass;
3812 }
3813
3814 #ifndef PRODUCT
3815 static void print_field_layout(const Symbol* name,
3816 Array<u2>* fields,
3817 const constantPoolHandle& cp,
3818 int instance_size,
3819 int instance_fields_start,
3820 int instance_fields_end,
3821 int static_fields_end) {
3822
3823 assert(name != NULL, "invariant");
3824
3825 tty->print("%s: field layout\n", name->as_klass_external_name());
3826 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3827 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3828 if (!fs.access_flags().is_static()) {
3829 tty->print(" @%3d \"%s\" %s\n",
3830 fs.offset(),
3831 fs.name()->as_klass_external_name(),
3832 fs.signature()->as_klass_external_name());
3833 }
3834 }
3835 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3836 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3837 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3838 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3839 if (fs.access_flags().is_static()) {
3840 tty->print(" @%3d \"%s\" %s\n",
3841 fs.offset(),
3842 fs.name()->as_klass_external_name(),
3843 fs.signature()->as_klass_external_name());
3844 }
3845 }
3846 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
3847 tty->print("\n");
3848 }
3849 #endif
3850
3851 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) {
3852 max_nonstatic_oop_maps = max_blocks;
3853 nonstatic_oop_map_count = 0;
3854 if (max_blocks == 0) {
3855 nonstatic_oop_maps = NULL;
3856 } else {
3857 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD(
3858 THREAD, OopMapBlock, max_nonstatic_oop_maps);
3859 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3860 }
3861 }
3862
3863 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3864 assert(nonstatic_oop_map_count > 0, "Has no oop maps");
3865 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1);
3866 }
3867
3868 // addition of super oop maps
3869 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3870 assert(nof_blocks && nonstatic_oop_map_count == 0 &&
3871 nof_blocks <= max_nonstatic_oop_maps, "invariant");
3872
3873 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3874 nonstatic_oop_map_count += nof_blocks;
3875 }
3876
3877 // collection of oops
3878 void OopMapBlocksBuilder::add(int offset, int count) {
3879 if (nonstatic_oop_map_count == 0) {
3880 nonstatic_oop_map_count++;
3881 }
3882 OopMapBlock* nonstatic_oop_map = last_oop_map();
3883 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up
3884 nonstatic_oop_map->set_offset(offset);
3885 nonstatic_oop_map->set_count(count);
3886 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3887 nonstatic_oop_map->increment_count(count);
3888 } else { // Need a new one...
3889 nonstatic_oop_map_count++;
3890 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check");
3891 nonstatic_oop_map = last_oop_map();
3892 nonstatic_oop_map->set_offset(offset);
3893 nonstatic_oop_map->set_count(count);
3894 }
3895 }
3896
3897 // general purpose copy, e.g. into allocated instanceKlass
3898 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
3899 if (nonstatic_oop_map_count != 0) {
3900 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count);
3901 }
3902 }
3903
3904 // Sort and compact adjacent blocks
3905 void OopMapBlocksBuilder::compact(TRAPS) {
3906 if (nonstatic_oop_map_count <= 1) {
3907 return;
3908 }
3909 /*
3910 * Since field layout sneeks in oops before values, we will be able to condense
3911 * blocks. There is potential to compact between super, own refs and values
3912 * containing refs.
3913 *
3914 * Currently compaction is slightly limited due to values being 8 byte aligned.
3915 * This may well change: FixMe if doesn't, the code below is fairly general purpose
3916 * and maybe it doesn't need to be.
3917 */
3918 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock),
3919 (_sort_Fn)OopMapBlock::compare_offset);
3920 if (nonstatic_oop_map_count < 2) {
3921 return;
3922 }
3923
3924 //Make a temp copy, and iterate through and copy back into the orig
3925 ResourceMark rm(THREAD);
3926 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock,
3927 nonstatic_oop_map_count);
3928 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count;
3929 copy(oop_maps_copy);
3930 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps;
3931 unsigned int new_count = 1;
3932 oop_maps_copy++;
3933 while(oop_maps_copy < oop_maps_copy_end) {
3934 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3935 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3936 nonstatic_oop_map->increment_count(oop_maps_copy->count());
3937 } else {
3938 nonstatic_oop_map++;
3939 new_count++;
3940 nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3941 nonstatic_oop_map->set_count(oop_maps_copy->count());
3942 }
3943 oop_maps_copy++;
3944 }
3945 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?");
3946 nonstatic_oop_map_count = new_count;
3947 }
3948
3949 void OopMapBlocksBuilder::print_on(outputStream* st) const {
3950 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps);
3951 if (nonstatic_oop_map_count > 0) {
3952 OopMapBlock* map = nonstatic_oop_maps;
3953 OopMapBlock* last_map = last_oop_map();
3954 assert(map <= last_map, "Last less than first");
3955 while (map <= last_map) {
3956 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
3957 map->offset() + map->offset_span() - heapOopSize, map->count());
3958 map++;
3959 }
3960 }
3961 }
3962
3963 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
3964 print_on(st);
3965 }
3966
3967 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL,
3968 const char* msg,
3969 const Symbol* name,
3970 const Symbol* sig) const {
3971
3972 ResourceMark rm(THREAD);
3973 if (name == NULL || sig == NULL) {
3974 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3975 vmSymbols::java_lang_ClassFormatError(),
3976 "class: %s - %s", _class_name->as_C_string(), msg);
3977 }
3978 else {
3979 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
3980 vmSymbols::java_lang_ClassFormatError(),
3981 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
3982 _class_name->as_C_string(), msg);
3983 }
3984 }
3985
3986 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
3987 void ClassFileParser::layout_fields(ConstantPool* cp,
3988 const FieldAllocationCount* fac,
3989 const ClassAnnotationCollector* parsed_annotations,
3990 FieldLayoutInfo* info,
3991 TRAPS) {
3992
3993 assert(cp != NULL, "invariant");
3994
3995 // Field size and offset computation
3996 int nonstatic_field_size = _super_klass == NULL ? 0 :
3997 _super_klass->nonstatic_field_size();
3998 int next_nonstatic_valuetype_offset = 0;
3999 int first_nonstatic_valuetype_offset = 0;
4000
4001 // Fields that are value types are handled differently depending if they are static or not:
4002 // - static fields are oops
4003 // - non-static fields are embedded
4004
4005 // Count the contended fields by type.
4006 //
4007 // We ignore static fields, because @Contended is not supported for them.
4008 // The layout code below will also ignore the static fields.
4009 int nonstatic_contended_count = 0;
4010 FieldAllocationCount fac_contended;
4011 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4012 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4013 if (fs.is_contended()) {
4014 fac_contended.count[atype]++;
4015 if (!fs.access_flags().is_static()) {
4016 nonstatic_contended_count++;
4017 }
4018 }
4019 }
4020
4021
4022 // Calculate the starting byte offsets
4023 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
4024 // Value types in static fields are not embedded, they are handled with oops
4025 int next_static_double_offset = next_static_oop_offset +
4026 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize);
4027 if (fac->count[STATIC_DOUBLE]) {
4028 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4029 }
4030
4031 int next_static_word_offset = next_static_double_offset +
4032 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4033 int next_static_short_offset = next_static_word_offset +
4034 ((fac->count[STATIC_WORD]) * BytesPerInt);
4035 int next_static_byte_offset = next_static_short_offset +
4036 ((fac->count[STATIC_SHORT]) * BytesPerShort);
4037
4038 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
4039 nonstatic_field_size * heapOopSize;
4040
4041 // First field of value types is aligned on a long boundary in order to ease
4042 // in-lining of value types (with header removal) in packed arrays and
4043 // flatten value types
4044 int initial_value_type_padding = 0;
4045 if (is_value_type()) {
4046 int old = nonstatic_fields_start;
4047 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong);
4048 initial_value_type_padding = nonstatic_fields_start - old;
4049 }
4050
4051 int next_nonstatic_field_offset = nonstatic_fields_start;
4052
4053 const bool is_contended_class = parsed_annotations->is_contended();
4054
4055 // Class is contended, pad before all the fields
4056 if (is_contended_class) {
4057 next_nonstatic_field_offset += ContendedPaddingWidth;
4058 }
4059
4060 // Temporary value types restrictions
4061 if (is_value_type()) {
4062 if (is_contended_class) {
4063 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet");
4064 return;
4065 }
4066 }
4067
4068 // Compute the non-contended fields count.
4069 // The packing code below relies on these counts to determine if some field
4070 // can be squeezed into the alignment gap. Contended fields are obviously
4071 // exempt from that.
4072 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4073 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
4074 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
4075 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
4076 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
4077
4078 int static_value_type_count = 0;
4079 int nonstatic_value_type_count = 0;
4080 int* nonstatic_value_type_indexes = NULL;
4081 Klass** nonstatic_value_type_klasses = NULL;
4082 unsigned int value_type_oop_map_count = 0;
4083 int not_flattened_value_types = 0;
4084
4085 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1;
4086
4087 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int,
4088 max_nonstatic_value_type);
4089 for (int i = 0; i < max_nonstatic_value_type; i++) {
4090 nonstatic_value_type_indexes[i] = -1;
4091 }
4092 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*,
4093 max_nonstatic_value_type);
4094
4095 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
4096 if (fs.allocation_type() == STATIC_FLATTENABLE) {
4097 ResourceMark rm;
4098 if (!fs.signature()->is_Q_signature()) {
4099 THROW(vmSymbols::java_lang_ClassFormatError());
4100 }
4101 static_value_type_count++;
4102 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) {
4103 // Pre-resolve the flattenable field and check for value type circularity issues.
4104 ResourceMark rm;
4105 if (!fs.signature()->is_Q_signature()) {
4106 THROW(vmSymbols::java_lang_ClassFormatError());
4107 }
4108 Klass* klass =
4109 SystemDictionary::resolve_flattenable_field_or_fail(&fs,
4110 Handle(THREAD, _loader_data->class_loader()),
4111 _protection_domain, true, CHECK);
4112 assert(klass != NULL, "Sanity check");
4113 if (!klass->access_flags().is_value_type()) {
4114 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
4115 }
4116 ValueKlass* vk = ValueKlass::cast(klass);
4117 // Conditions to apply flattening or not should be defined in a single place
4118 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) {
4119 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index();
4120 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass;
4121 nonstatic_value_type_count++;
4122
4123 ValueKlass* vklass = ValueKlass::cast(klass);
4124 if (vklass->contains_oops()) {
4125 value_type_oop_map_count += vklass->nonstatic_oop_map_count();
4126 }
4127 fs.set_flattened(true);
4128 } else {
4129 not_flattened_value_types++;
4130 fs.set_flattened(false);
4131 }
4132 }
4133 }
4134
4135 // Adjusting non_static_oop_count to take into account not flattened value types;
4136 nonstatic_oop_count += not_flattened_value_types;
4137
4138 // Total non-static fields count, including every contended field
4139 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4140 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4141 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE];
4142
4143 const bool super_has_nonstatic_fields =
4144 (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4145 const bool has_nonstatic_fields =
4146 super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4147 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0;
4148
4149 if (is_value_type() && (!has_nonstatic_fields)) {
4150 // There are a number of fixes required throughout the type system and JIT
4151 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet");
4152 return;
4153 }
4154
4155 // Prepare list of oops for oop map generation.
4156 //
4157 // "offset" and "count" lists are describing the set of contiguous oop
4158 // regions. offset[i] is the start of the i-th region, which then has
4159 // count[i] oops following. Before we know how many regions are required,
4160 // we pessimistically allocate the maps to fit all the oops into the
4161 // distinct regions.
4162 //
4163 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count();
4164 int max_oop_map_count =
4165 super_oop_map_count +
4166 fac->count[NONSTATIC_OOP] +
4167 value_type_oop_map_count +
4168 not_flattened_value_types;
4169
4170 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD);
4171 if (super_oop_map_count > 0) {
4172 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(),
4173 _super_klass->nonstatic_oop_map_count());
4174 }
4175
4176 int first_nonstatic_oop_offset = 0; // will be set for first oop field
4177
4178 bool compact_fields = CompactFields;
4179 int allocation_style = FieldsAllocationStyle;
4180 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
4181 assert(false, "0 <= FieldsAllocationStyle <= 2");
4182 allocation_style = 1; // Optimistic
4183 }
4184
4185 // The next classes have predefined hard-coded fields offsets
4186 // (see in JavaClasses::compute_hard_coded_offsets()).
4187 // Use default fields allocation order for them.
4188 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
4189 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
4190 _class_name == vmSymbols::java_lang_Class() ||
4191 _class_name == vmSymbols::java_lang_ClassLoader() ||
4192 _class_name == vmSymbols::java_lang_ref_Reference() ||
4193 _class_name == vmSymbols::java_lang_ref_SoftReference() ||
4194 _class_name == vmSymbols::java_lang_StackTraceElement() ||
4203 _class_name == vmSymbols::java_lang_Integer() ||
4204 _class_name == vmSymbols::java_lang_Long())) {
4205 allocation_style = 0; // Allocate oops first
4206 compact_fields = false; // Don't compact fields
4207 }
4208
4209 int next_nonstatic_oop_offset = 0;
4210 int next_nonstatic_double_offset = 0;
4211
4212 // Rearrange fields for a given allocation style
4213 if( allocation_style == 0 ) {
4214 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4215 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4216 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4217 (nonstatic_oop_count * heapOopSize);
4218 } else if( allocation_style == 1 ) {
4219 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4220 next_nonstatic_double_offset = next_nonstatic_field_offset;
4221 } else if( allocation_style == 2 ) {
4222 // Fields allocation: oops fields in super and sub classes are together.
4223 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) {
4224 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) {
4225 allocation_style = 0; // allocate oops first
4226 next_nonstatic_oop_offset = next_nonstatic_field_offset;
4227 next_nonstatic_double_offset = next_nonstatic_oop_offset +
4228 (nonstatic_oop_count * heapOopSize);
4229 }
4230 }
4231 if( allocation_style == 2 ) {
4232 allocation_style = 1; // allocate oops last
4233 next_nonstatic_double_offset = next_nonstatic_field_offset;
4234 }
4235 } else {
4236 ShouldNotReachHere();
4237 }
4238
4239 int nonstatic_oop_space_count = 0;
4240 int nonstatic_word_space_count = 0;
4241 int nonstatic_short_space_count = 0;
4242 int nonstatic_byte_space_count = 0;
4243 int nonstatic_oop_space_offset = 0;
4244 int nonstatic_word_space_offset = 0;
4287 }
4288
4289 int next_nonstatic_word_offset = next_nonstatic_double_offset +
4290 (nonstatic_double_count * BytesPerLong);
4291 int next_nonstatic_short_offset = next_nonstatic_word_offset +
4292 (nonstatic_word_count * BytesPerInt);
4293 int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4294 (nonstatic_short_count * BytesPerShort);
4295 int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4296 nonstatic_byte_count;
4297
4298 // let oops jump before padding with this allocation style
4299 if( allocation_style == 1 ) {
4300 next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4301 if( nonstatic_oop_count > 0 ) {
4302 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4303 }
4304 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4305 }
4306
4307 // Aligning embedded value types
4308 // bug below, the current algorithm to layout embedded value types always put them at the
4309 // end of the layout, which doesn't match the different allocation policies the VM is
4310 // supposed to provide => FixMe
4311 // Note also that the current alignment policy is to make each value type starting on a
4312 // 64 bits boundary. This could be optimized later. For instance, it could be nice to
4313 // align value types according to their most constrained internal type.
4314 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4315 int next_value_type_index = 0;
4316
4317 // Iterate over fields again and compute correct offsets.
4318 // The field allocation type was temporarily stored in the offset slot.
4319 // oop fields are located before non-oop fields (static and non-static).
4320 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4321
4322 // skip already laid out fields
4323 if (fs.is_offset_set()) continue;
4324
4325 // contended instance fields are handled below
4326 if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4327
4328 int real_offset = 0;
4329 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4330
4331 // pack the rest of the fields
4332 switch (atype) {
4333 // Value types in static fields are handled with oops
4334 case STATIC_FLATTENABLE: // Fallthrough
4335 case STATIC_OOP:
4336 real_offset = next_static_oop_offset;
4337 next_static_oop_offset += heapOopSize;
4338 break;
4339 case STATIC_BYTE:
4340 real_offset = next_static_byte_offset;
4341 next_static_byte_offset += 1;
4342 break;
4343 case STATIC_SHORT:
4344 real_offset = next_static_short_offset;
4345 next_static_short_offset += BytesPerShort;
4346 break;
4347 case STATIC_WORD:
4348 real_offset = next_static_word_offset;
4349 next_static_word_offset += BytesPerInt;
4350 break;
4351 case STATIC_DOUBLE:
4352 real_offset = next_static_double_offset;
4353 next_static_double_offset += BytesPerLong;
4354 break;
4355 case NONSTATIC_FLATTENABLE:
4356 if (fs.is_flattened()) {
4357 Klass* klass = nonstatic_value_type_klasses[next_value_type_index];
4358 assert(klass != NULL, "Klass should have been loaded and resolved earlier");
4359 assert(klass->access_flags().is_value_type(),"Must be a value type");
4360 ValueKlass* vklass = ValueKlass::cast(klass);
4361 real_offset = next_nonstatic_valuetype_offset;
4362 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset();
4363 // aligning next value type on a 64 bits boundary
4364 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong);
4365 next_value_type_index += 1;
4366
4367 if (vklass->contains_oops()) { // add flatten oop maps
4368 int diff = real_offset - vklass->first_field_offset();
4369 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps();
4370 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count();
4371 while (map < last_map) {
4372 nonstatic_oop_maps->add(map->offset() + diff, map->count());
4373 map++;
4374 }
4375 }
4376 break;
4377 } else {
4378 // Fall through
4379 }
4380 case NONSTATIC_OOP:
4381 if( nonstatic_oop_space_count > 0 ) {
4382 real_offset = nonstatic_oop_space_offset;
4383 nonstatic_oop_space_offset += heapOopSize;
4384 nonstatic_oop_space_count -= 1;
4385 } else {
4386 real_offset = next_nonstatic_oop_offset;
4387 next_nonstatic_oop_offset += heapOopSize;
4388 }
4389 nonstatic_oop_maps->add(real_offset, 1);
4390 break;
4391 case NONSTATIC_BYTE:
4392 if( nonstatic_byte_space_count > 0 ) {
4393 real_offset = nonstatic_byte_space_offset;
4394 nonstatic_byte_space_offset += 1;
4395 nonstatic_byte_space_count -= 1;
4396 } else {
4397 real_offset = next_nonstatic_byte_offset;
4398 next_nonstatic_byte_offset += 1;
4399 }
4400 break;
4401 case NONSTATIC_SHORT:
4402 if( nonstatic_short_space_count > 0 ) {
4403 real_offset = nonstatic_short_space_offset;
4404 nonstatic_short_space_offset += BytesPerShort;
4405 nonstatic_short_space_count -= 1;
4406 } else {
4407 real_offset = next_nonstatic_short_offset;
4408 next_nonstatic_short_offset += BytesPerShort;
4409 }
4478 break;
4479
4480 case NONSTATIC_SHORT:
4481 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4482 real_offset = next_nonstatic_padded_offset;
4483 next_nonstatic_padded_offset += BytesPerShort;
4484 break;
4485
4486 case NONSTATIC_WORD:
4487 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4488 real_offset = next_nonstatic_padded_offset;
4489 next_nonstatic_padded_offset += BytesPerInt;
4490 break;
4491
4492 case NONSTATIC_DOUBLE:
4493 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4494 real_offset = next_nonstatic_padded_offset;
4495 next_nonstatic_padded_offset += BytesPerLong;
4496 break;
4497
4498 // Value types in static fields are handled with oops
4499 case NONSTATIC_FLATTENABLE:
4500 throwValueTypeLimitation(THREAD_AND_LOCATION,
4501 "@Contended annotation not supported for value types yet", fs.name(), fs.signature());
4502 return;
4503
4504 case NONSTATIC_OOP:
4505 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4506 real_offset = next_nonstatic_padded_offset;
4507 next_nonstatic_padded_offset += heapOopSize;
4508 nonstatic_oop_maps->add(real_offset, 1);
4509 break;
4510
4511 default:
4512 ShouldNotReachHere();
4513 }
4514
4515 if (fs.contended_group() == 0) {
4516 // Contended group defines the equivalence class over the fields:
4517 // the fields within the same contended group are not inter-padded.
4518 // The only exception is default group, which does not incur the
4519 // equivalence, and so requires intra-padding.
4520 next_nonstatic_padded_offset += ContendedPaddingWidth;
4521 }
4522
4523 fs.set_offset(real_offset);
4524 } // for
4525
4526 // Start laying out the next group.
4527 // Note that this will effectively pad the last group in the back;
4528 // this is expected to alleviate memory contention effects for
4529 // subclass fields and/or adjacent object.
4530 // If this was the default group, the padding is already in place.
4531 if (current_group != 0) {
4532 next_nonstatic_padded_offset += ContendedPaddingWidth;
4533 }
4534 }
4535
4536 // handle static fields
4537 }
4538
4539 // Entire class is contended, pad in the back.
4540 // This helps to alleviate memory contention effects for subclass fields
4541 // and/or adjacent object.
4542 if (is_contended_class) {
4543 assert(!is_value_type(), "@Contended not supported for value types yet");
4544 next_nonstatic_padded_offset += ContendedPaddingWidth;
4545 }
4546
4547 int notaligned_nonstatic_fields_end;
4548 if (nonstatic_value_type_count != 0) {
4549 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset;
4550 } else {
4551 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4552 }
4553
4554 int nonstatic_field_sz_align = heapOopSize;
4555 if (is_value_type()) {
4556 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) {
4557 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy
4558 }
4559 }
4560 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align);
4561 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize);
4562 int static_fields_end = align_up(next_static_byte_offset, wordSize);
4563
4564 int static_field_size = (static_fields_end -
4565 InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4566 nonstatic_field_size = nonstatic_field_size +
4567 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4568
4569 int instance_size = align_object_size(instance_end / wordSize);
4570
4571 assert(instance_size == align_object_size(align_up(
4572 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize)
4573 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value");
4574
4575
4576 // Invariant: nonstatic_field end/start should only change if there are
4577 // nonstatic fields in the class, or if the class is contended. We compare
4578 // against the non-aligned value, so that end alignment will not fail the
4579 // assert without actually having the fields.
4580 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4581 is_contended_class ||
4582 (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4583
4584 // Number of non-static oop map blocks allocated at end of klass.
4585 nonstatic_oop_maps->compact(THREAD);
4586
4587 #ifndef PRODUCT
4588 if ((PrintFieldLayout && !is_value_type()) ||
4589 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) {
4590 print_field_layout(_class_name,
4591 _fields,
4592 cp,
4593 instance_size,
4594 nonstatic_fields_start,
4595 nonstatic_fields_end,
4596 static_fields_end);
4597 nonstatic_oop_maps->print_on(tty);
4598 tty->print("\n");
4599 tty->print_cr("Instance size = %d", instance_size);
4600 tty->print_cr("Nonstatic_field_size = %d", nonstatic_field_size);
4601 tty->print_cr("Static_field_size = %d", static_field_size);
4602 tty->print_cr("Has nonstatic fields = %d", has_nonstatic_fields);
4603 tty->print_cr("---");
4604 }
4605
4606 #endif
4607 // Pass back information needed for InstanceKlass creation
4608 info->oop_map_blocks = nonstatic_oop_maps;
4609 info->instance_size = instance_size;
4610 info->static_field_size = static_field_size;
4611 info->nonstatic_field_size = nonstatic_field_size;
4612 info->has_nonstatic_fields = has_nonstatic_fields;
4613 }
4614
4615 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) {
4616 assert(ik != NULL, "invariant");
4617
4618 const Klass* const super = ik->super();
4619
4620 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4621 // in which case we don't have to register objects as finalizable
4622 if (!_has_empty_finalizer) {
4623 if (_has_finalizer ||
4624 (super != NULL && super->has_finalizer())) {
4625 ik->set_has_finalizer();
4626 }
4627 }
4628
4629 #ifdef ASSERT
4630 bool f = false;
4631 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4632 vmSymbols::void_method_signature());
4633 if (m != NULL && !m->is_empty_method()) {
4634 f = true;
4635 }
4636
4637 // Spec doesn't prevent agent from redefinition of empty finalizer.
4638 // Despite the fact that it's generally bad idea and redefined finalizer
4639 // will not work as expected we shouldn't abort vm in this case
4640 if (!ik->has_redefined_this_or_super()) {
4641 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4642 }
4643 #endif
4644
4645 // Check if this klass supports the java.lang.Cloneable interface
4646 if (SystemDictionary::Cloneable_klass_loaded()) {
4647 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4648 if (ik->is_value()) {
4649 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable");
4650 return;
4651 }
4652 ik->set_is_cloneable();
4653 }
4654 }
4655
4656 // Check if this klass has a vanilla default constructor
4657 if (super == NULL) {
4658 // java.lang.Object has empty default constructor
4659 ik->set_has_vanilla_constructor();
4660 } else {
4661 if (super->has_vanilla_constructor() &&
4662 _has_vanilla_constructor) {
4663 ik->set_has_vanilla_constructor();
4664 }
4665 #ifdef ASSERT
4666 bool v = false;
4667 if (super->has_vanilla_constructor()) {
4668 const Method* const constructor =
4669 ik->find_method(vmSymbols::object_initializer_name(),
4670 vmSymbols::void_method_signature());
4671 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4672 v = true;
4673 }
4674 }
4675 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4676 #endif
4677 }
4678
4679 // If it cannot be fast-path allocated, set a bit in the layout helper.
4680 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4681 assert(ik->size_helper() > 0, "layout_helper is initialized");
4682 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4683 || ik->is_abstract() || ik->is_interface()
4684 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4685 || ik->size_helper() >= FastAllocateSizeLimit) {
4686 // Forbid fast-path allocation.
4687 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4688 ik->set_layout_helper(lh);
4689 }
4690 }
4691
4692 bool ClassFileParser::supports_value_types() const {
4693 // Value types are only supported by class file version 55 and later
4694 return _major_version >= JAVA_11_VERSION;
4695 }
4696
4697 // utility methods for appending an array with check for duplicates
4698
4699 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4700 const Array<InstanceKlass*>* const ifs) {
4701 // iterate over new interfaces
4702 for (int i = 0; i < ifs->length(); i++) {
4703 InstanceKlass* const e = ifs->at(i);
4704 assert(e->is_klass() && e->is_interface(), "just checking");
4705 // add new interface
4706 result->append_if_missing(e);
4707 }
4708 }
4709
4710 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4711 Array<InstanceKlass*>* local_ifs,
4712 ClassLoaderData* loader_data,
4713 TRAPS) {
4714 assert(local_ifs != NULL, "invariant");
4715 assert(loader_data != NULL, "invariant");
4716
4939 const Method* const m = methods->at(index);
4940 // if m is static and not the init method, throw a verify error
4941 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4942 ResourceMark rm(THREAD);
4943 Exceptions::fthrow(
4944 THREAD_AND_LOCATION,
4945 vmSymbols::java_lang_VerifyError(),
4946 "Illegal static method %s in interface %s",
4947 m->name()->as_C_string(),
4948 this_klass->external_name()
4949 );
4950 return;
4951 }
4952 }
4953 }
4954
4955 // utility methods for format checking
4956
4957 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4958 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4959 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0;
4960 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4961 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set");
4962 if (is_module) {
4963 ResourceMark rm(THREAD);
4964 Exceptions::fthrow(
4965 THREAD_AND_LOCATION,
4966 vmSymbols::java_lang_NoClassDefFoundError(),
4967 "%s is not a class because access_flag ACC_MODULE is set",
4968 _class_name->as_C_string());
4969 return;
4970 }
4971
4972 if (is_value_type && !EnableValhalla) {
4973 ResourceMark rm(THREAD);
4974 Exceptions::fthrow(
4975 THREAD_AND_LOCATION,
4976 vmSymbols::java_lang_ClassFormatError(),
4977 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
4978 _class_name->as_C_string()
4979 );
4980 }
4981
4982 if (!_need_verify) { return; }
4983
4984 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4985 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4986 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4987 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4988 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4989 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4990 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4991
4992 if ((is_abstract && is_final) ||
4993 (is_interface && !is_abstract) ||
4994 (is_interface && major_gte_15 && (is_super || is_enum)) ||
4995 (!is_interface && major_gte_15 && is_annotation) ||
4996 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) {
4997 ResourceMark rm(THREAD);
4998 const char* class_note = "";
4999 if (is_value_type) class_note = " (an inline class)";
5000 Exceptions::fthrow(
5001 THREAD_AND_LOCATION,
5002 vmSymbols::java_lang_ClassFormatError(),
5003 "Illegal class modifiers in class %s%s: 0x%X",
5004 _class_name->as_C_string(), class_note, flags
5005 );
5006 return;
5007 }
5008 }
5009
5010 static bool has_illegal_visibility(jint flags) {
5011 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5012 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5013 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5014
5015 return ((is_public && is_protected) ||
5016 (is_public && is_private) ||
5017 (is_protected && is_private));
5018 }
5019
5020 // A legal major_version.minor_version must be one of the following:
5021 //
5022 // Major_version >= 45 and major_version < 56, any minor_version.
5023 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
5024 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
5063 if (!Arguments::enable_preview()) {
5064 Exceptions::fthrow(
5065 THREAD_AND_LOCATION,
5066 vmSymbols::java_lang_UnsupportedClassVersionError(),
5067 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
5068 class_name->as_C_string(), major, minor);
5069 return;
5070 }
5071
5072 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
5073 Exceptions::fthrow(
5074 THREAD_AND_LOCATION,
5075 vmSymbols::java_lang_UnsupportedClassVersionError(),
5076 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
5077 class_name->as_C_string(), major, minor);
5078 }
5079 }
5080
5081 void ClassFileParser::verify_legal_field_modifiers(jint flags,
5082 bool is_interface,
5083 bool is_value_type,
5084 TRAPS) const {
5085 if (!_need_verify) { return; }
5086
5087 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5088 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5089 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5090 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5091 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5092 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
5093 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5094 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
5095 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5096
5097 bool is_illegal = false;
5098
5099 if (is_interface) {
5100 if (!is_public || !is_static || !is_final || is_private ||
5101 is_protected || is_volatile || is_transient ||
5102 (major_gte_15 && is_enum)) {
5103 is_illegal = true;
5104 }
5105 } else { // not interface
5106 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5107 is_illegal = true;
5108 } else {
5109 if (is_value_type && !is_static && !is_final) {
5110 is_illegal = true;
5111 }
5112 }
5113 }
5114
5115 if (is_illegal) {
5116 ResourceMark rm(THREAD);
5117 Exceptions::fthrow(
5118 THREAD_AND_LOCATION,
5119 vmSymbols::java_lang_ClassFormatError(),
5120 "Illegal field modifiers in class %s: 0x%X",
5121 _class_name->as_C_string(), flags);
5122 return;
5123 }
5124 }
5125
5126 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5127 bool is_interface,
5128 bool is_value_type,
5129 const Symbol* name,
5130 TRAPS) const {
5131 if (!_need_verify) { return; }
5132
5133 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
5134 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
5135 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
5136 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
5137 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
5138 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
5139 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
5140 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
5141 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5142 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
5143 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
5144 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
5145 const bool is_initializer = (name == vmSymbols::object_initializer_name());
5146
5147 bool is_illegal = false;
5148
5149 const char* class_note = "";
5150
5151 if (is_interface) {
5152 if (major_gte_8) {
5153 // Class file version is JAVA_8_VERSION or later Methods of
5154 // interfaces may set any of the flags except ACC_PROTECTED,
5155 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5156 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5157 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5158 (is_native || is_protected || is_final || is_synchronized) ||
5159 // If a specific method of a class or interface has its
5160 // ACC_ABSTRACT flag set, it must not have any of its
5161 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5162 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
5163 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5164 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5165 (is_abstract && (is_private || is_static || is_strict))) {
5166 is_illegal = true;
5167 }
5168 } else if (major_gte_15) {
5169 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5170 if (!is_public || is_private || is_protected || is_static || is_final ||
5171 is_synchronized || is_native || !is_abstract || is_strict) {
5172 is_illegal = true;
5173 }
5174 } else {
5175 // Class file version is pre-JAVA_1_5_VERSION
5176 if (!is_public || is_static || is_final || is_native || !is_abstract) {
5177 is_illegal = true;
5178 }
5179 }
5180 } else { // not interface
5181 if (has_illegal_visibility(flags)) {
5182 is_illegal = true;
5183 } else {
5184 if (is_initializer) {
5185 if (is_final || is_synchronized || is_native ||
5186 is_abstract || (major_gte_15 && is_bridge)) {
5187 is_illegal = true;
5188 }
5189 if (!is_static && !is_value_type) {
5190 // OK, an object constructor in a regular class
5191 } else if (is_static && is_value_type) {
5192 // OK, a static init factory in an inline class
5193 } else {
5194 // but no other combinations are allowed
5195 is_illegal = true;
5196 class_note = (is_value_type ? " (an inline class)" : " (not an inline class)");
5197 }
5198 } else { // not initializer
5199 if (is_value_type && is_synchronized && !is_static) {
5200 is_illegal = true;
5201 class_note = " (an inline class)";
5202 } else {
5203 if (is_abstract) {
5204 if ((is_final || is_native || is_private || is_static ||
5205 (major_gte_15 && (is_synchronized || is_strict)))) {
5206 is_illegal = true;
5207 }
5208 }
5209 }
5210 }
5211 }
5212 }
5213
5214 if (is_illegal) {
5215 ResourceMark rm(THREAD);
5216 Exceptions::fthrow(
5217 THREAD_AND_LOCATION,
5218 vmSymbols::java_lang_ClassFormatError(),
5219 "Method %s in class %s%s has illegal modifiers: 0x%X",
5220 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
5221 return;
5222 }
5223 }
5224
5225 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5226 int length,
5227 TRAPS) const {
5228 assert(_need_verify, "only called when _need_verify is true");
5229 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5230 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5231 }
5232 }
5233
5234 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5235 // In class names, '/' separates unqualified names. This is verified in this function also.
5236 // Method names also may not contain the characters '<' or '>', unless <init>
5237 // or <clinit>. Note that method names may not be <init> or <clinit> in this
5238 // method. Because these names have been checked as special cases before
5239 // calling this method in verify_legal_method_name.
5240 //
5357 // be taken as a field signature. Allow "void" if void_ok.
5358 // Return a pointer to just past the signature.
5359 // Return NULL if no legal signature is found.
5360 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5361 bool void_ok,
5362 unsigned int length,
5363 TRAPS) const {
5364 unsigned int array_dim = 0;
5365 while (length > 0) {
5366 switch (signature[0]) {
5367 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5368 case JVM_SIGNATURE_BOOLEAN:
5369 case JVM_SIGNATURE_BYTE:
5370 case JVM_SIGNATURE_CHAR:
5371 case JVM_SIGNATURE_SHORT:
5372 case JVM_SIGNATURE_INT:
5373 case JVM_SIGNATURE_FLOAT:
5374 case JVM_SIGNATURE_LONG:
5375 case JVM_SIGNATURE_DOUBLE:
5376 return signature + 1;
5377 case JVM_SIGNATURE_VALUETYPE:
5378 // Can't enable this check until JDK upgrades the bytecode generators
5379 // if (_major_version < CONSTANT_CLASS_DESCRIPTORS ) {
5380 // classfile_parse_error("Class name contains illegal Q-signature "
5381 // "in descriptor in class file %s",
5382 // CHECK_0);
5383 // }
5384 // fall through
5385 case JVM_SIGNATURE_CLASS:
5386 {
5387 if (_major_version < JAVA_1_5_VERSION) {
5388 // Skip over the class name if one is there
5389 const char* const p = skip_over_field_name(signature + 1, true, --length);
5390
5391 // The next character better be a semicolon
5392 if (p && (p - signature) > 1 && p[0] == ';') {
5393 return p + 1;
5394 }
5395 }
5396 else {
5397 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5398 signature++;
5399 const char* c = (const char*) memchr(signature, ';', length - 1);
5400 // Format check signature
5401 if (c != NULL) {
5402 int newlen = c - (char*) signature;
5403 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5404 if (!legal) {
5405 classfile_parse_error("Class name is empty or contains illegal character "
5406 "in descriptor in class file %s",
5407 CHECK_0);
5408 return NULL;
5409 }
5410 return signature + newlen + 1;
5411 }
5412 }
5413 return NULL;
5414 }
5415 case JVM_SIGNATURE_ARRAY:
5416 array_dim++;
5417 if (array_dim > 255) {
5432
5433 // Checks if name is a legal class name.
5434 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5435 if (!_need_verify || _relax_verify) { return; }
5436
5437 assert(name->refcount() > 0, "symbol must be kept alive");
5438 char* bytes = (char*)name->bytes();
5439 unsigned int length = name->utf8_length();
5440 bool legal = false;
5441
5442 if (length > 0) {
5443 const char* p;
5444 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5445 p = skip_over_field_signature(bytes, false, length, CHECK);
5446 legal = (p != NULL) && ((p - bytes) == (int)length);
5447 } else if (_major_version < JAVA_1_5_VERSION) {
5448 if (bytes[0] != '<') {
5449 p = skip_over_field_name(bytes, true, length);
5450 legal = (p != NULL) && ((p - bytes) == (int)length);
5451 }
5452 } else if (_major_version >= CONSTANT_CLASS_DESCRIPTORS && bytes[length - 1] == ';' ) {
5453 // Support for L...; and Q...; descriptors
5454 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5455 } else {
5456 // 4900761: relax the constraints based on JSR202 spec
5457 // Class names may be drawn from the entire Unicode character set.
5458 // Identifiers between '/' must be unqualified names.
5459 // The utf8 string has been verified when parsing cpool entries.
5460 legal = verify_unqualified_name(bytes, length, LegalClass);
5461 }
5462 }
5463 if (!legal) {
5464 ResourceMark rm(THREAD);
5465 assert(_class_name != NULL, "invariant");
5466 Exceptions::fthrow(
5467 THREAD_AND_LOCATION,
5468 vmSymbols::java_lang_ClassFormatError(),
5469 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5470 _class_name->as_C_string()
5471 );
5472 return;
5473 }
5474 }
5584 const char* nextp;
5585
5586 // The first character must be a '('
5587 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5588 length--;
5589 // Skip over legal field signatures
5590 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5591 while ((length > 0) && (nextp != NULL)) {
5592 args_size++;
5593 if (p[0] == 'J' || p[0] == 'D') {
5594 args_size++;
5595 }
5596 length -= nextp - p;
5597 p = nextp;
5598 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5599 }
5600 // The first non-signature thing better be a ')'
5601 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5602 length--;
5603 if (name->utf8_length() > 0 && name->char_at(0) == '<') {
5604 // All constructor methods must return void
5605 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5606 return args_size;
5607 }
5608 // All static init methods must return the current class
5609 if ((length >= 3) && (p[length-1] == JVM_SIGNATURE_ENDCLASS)
5610 && name == vmSymbols::object_initializer_name()) {
5611 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5612 if (nextp && ((int)length == (nextp - p))) {
5613 // The actual class will be checked against current class
5614 // when the method is defined (see parse_method).
5615 // A reference to a static init with a bad return type
5616 // will load and verify OK, but will fail to link.
5617 return args_size;
5618 }
5619 }
5620 // The distinction between static factory methods and
5621 // constructors depends on the JVM_ACC_STATIC modifier.
5622 // This distinction must be reflected in a void or non-void
5623 // return. For declared methods, the check is in parse_method.
5624 } else {
5625 // Now we better just have a return value
5626 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5627 if (nextp && ((int)length == (nextp - p))) {
5628 return args_size;
5629 }
5630 }
5631 }
5632 }
5633 // Report error
5634 throwIllegalSignature("Method", name, signature, CHECK_0);
5635 return 0;
5636 }
5637
5638 int ClassFileParser::static_field_size() const {
5639 assert(_field_info != NULL, "invariant");
5640 return _field_info->static_field_size;
5641 }
5642
5643 int ClassFileParser::total_oop_map_count() const {
5644 assert(_field_info != NULL, "invariant");
5645 return _field_info->oop_map_blocks->nonstatic_oop_map_count;
5646 }
5647
5648 jint ClassFileParser::layout_size() const {
5649 assert(_field_info != NULL, "invariant");
5650 return _field_info->instance_size;
5651 }
5652
5653 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5654 const Array<Method*>* methods) {
5655 assert(ik != NULL, "invariant");
5656 assert(methods != NULL, "invariant");
5657
5658 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5659 // (We used to do this lazily, but now we query it in Rewriter,
5660 // which is eagerly done for every method, so we might as well do it now,
5661 // when everything is fresh in memory.)
5662 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5663
5664 if (klass_id != vmSymbols::NO_SID) {
5665 for (int j = 0; j < methods->length(); ++j) {
5755
5756
5757 if (ik->should_store_fingerprint()) {
5758 ik->store_fingerprint(_stream->compute_fingerprint());
5759 }
5760
5761 ik->set_has_passed_fingerprint_check(false);
5762 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5763 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5764 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5765 if (aot_fp != 0 && aot_fp == fp) {
5766 // This class matches with a class saved in an AOT library
5767 ik->set_has_passed_fingerprint_check(true);
5768 } else {
5769 ResourceMark rm;
5770 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5771 ik->external_name(), aot_fp, _stream->compute_fingerprint());
5772 }
5773 }
5774
5775 if (ik->is_value()) {
5776 ValueKlass* vk = ValueKlass::cast(ik);
5777 oop val = ik->allocate_instance(CHECK_NULL);
5778 vk->set_default_value(val);
5779 }
5780
5781 return ik;
5782 }
5783
5784 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5785 assert(ik != NULL, "invariant");
5786
5787 // Set name and CLD before adding to CLD
5788 ik->set_class_loader_data(_loader_data);
5789 ik->set_name(_class_name);
5790
5791 // Add all classes to our internal class loader list here,
5792 // including classes in the bootstrap (NULL) class loader.
5793 const bool publicize = !is_internal();
5794
5795 _loader_data->add_class(ik, publicize);
5796
5797 set_klass_to_deallocate(ik);
5798
5799 assert(_field_info != NULL, "invariant");
5800 assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5801 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count,
5802 "sanity");
5803
5804 assert(ik->is_instance_klass(), "sanity");
5805 assert(ik->size_helper() == _field_info->instance_size, "sanity");
5806
5807 // Fill in information already parsed
5808 ik->set_should_verify_class(_need_verify);
5809
5810 // Not yet: supers are done below to support the new subtype-checking fields
5811 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5812 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5813 if (_is_empty_value) {
5814 ik->set_is_empty_value();
5815 }
5816 assert(_fac != NULL, "invariant");
5817 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]);
5818
5819 // this transfers ownership of a lot of arrays from
5820 // the parser onto the InstanceKlass*
5821 apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5822
5823 // note that is not safe to use the fields in the parser from this point on
5824 assert(NULL == _cp, "invariant");
5825 assert(NULL == _fields, "invariant");
5826 assert(NULL == _methods, "invariant");
5827 assert(NULL == _inner_classes, "invariant");
5828 assert(NULL == _nest_members, "invariant");
5829 assert(NULL == _local_interfaces, "invariant");
5830 assert(NULL == _combined_annotations, "invariant");
5831
5832 if (_has_final_method) {
5833 ik->set_has_final_method();
5834 }
5835
5836 ik->copy_method_ordering(_method_ordering, CHECK);
5837 // The InstanceKlass::_methods_jmethod_ids cache
5885
5886 // Miranda methods
5887 if ((_num_miranda_methods > 0) ||
5888 // if this class introduced new miranda methods or
5889 (_super_klass != NULL && _super_klass->has_miranda_methods())
5890 // super class exists and this class inherited miranda methods
5891 ) {
5892 ik->set_has_miranda_methods(); // then set a flag
5893 }
5894
5895 // Fill in information needed to compute superclasses.
5896 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5897 ik->set_transitive_interfaces(_transitive_interfaces);
5898 _transitive_interfaces = NULL;
5899
5900 // Initialize itable offset tables
5901 klassItable::setup_itable_offset_table(ik);
5902
5903 // Compute transitive closure of interfaces this class implements
5904 // Do final class setup
5905 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5906 if (oop_map_blocks->nonstatic_oop_map_count > 0) {
5907 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5908 }
5909
5910 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5911 set_precomputed_flags(ik, CHECK);
5912
5913 // check if this class can access its super class
5914 check_super_class_access(ik, CHECK);
5915
5916 // check if this class can access its superinterfaces
5917 check_super_interface_access(ik, CHECK);
5918
5919 // check if this class overrides any final method
5920 check_final_method_override(ik, CHECK);
5921
5922 // reject static interface methods prior to Java 8
5923 if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5924 check_illegal_static_method(ik, CHECK);
5925 }
5926
5927 // Obtain this_klass' module entry
5928 ModuleEntry* module_entry = ik->module();
5929 assert(module_entry != NULL, "module_entry should always be set");
5930
5931 // Obtain java.lang.Module
5941
5942 assert(_all_mirandas != NULL, "invariant");
5943
5944 // Generate any default methods - default methods are public interface methods
5945 // that have a default implementation. This is new with Java 8.
5946 if (_has_nonstatic_concrete_methods) {
5947 DefaultMethods::generate_default_methods(ik,
5948 _all_mirandas,
5949 CHECK);
5950 }
5951
5952 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5953 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5954 !module_entry->has_default_read_edges()) {
5955 if (!module_entry->set_has_default_read_edges()) {
5956 // We won a potential race
5957 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5958 }
5959 }
5960
5961 int nfields = ik->java_fields_count();
5962 if (ik->is_value()) nfields++;
5963 for (int i = 0; i < nfields; i++) {
5964 if (ik->field_is_flattenable(i)) {
5965 Symbol* klass_name = ik->field_signature(i)->fundamental_name(CHECK);
5966 // Inline classes for instance fields must have been pre-loaded
5967 // Inline classes for static fields might not have been loaded yet
5968 Klass* klass = SystemDictionary::find(klass_name,
5969 Handle(THREAD, ik->class_loader()),
5970 Handle(THREAD, ik->protection_domain()), CHECK);
5971 if (klass != NULL) {
5972 assert(klass->access_flags().is_value_type(), "Value type expected");
5973 ik->set_value_field_klass(i, klass);
5974 }
5975 klass_name->decrement_refcount();
5976 } else
5977 if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)
5978 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) {
5979 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
5980 }
5981 }
5982
5983 if (is_value_type()) {
5984 ValueKlass* vk = ValueKlass::cast(ik);
5985 if (UseNewLayout) {
5986 vk->set_alignment(_alignment);
5987 vk->set_first_field_offset(_first_field_offset);
5988 vk->set_exact_size_in_bytes(_exact_size_in_bytes);
5989 } else {
5990 vk->set_first_field_offset(vk->first_field_offset_old());
5991 }
5992 ValueKlass::cast(ik)->initialize_calling_convention(CHECK);
5993 }
5994
5995 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5996
5997 if (!is_internal()) {
5998 if (log_is_enabled(Info, class, load)) {
5999 ResourceMark rm;
6000 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
6001 ik->print_class_load_logging(_loader_data, module_name, _stream);
6002 }
6003
6004 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
6005 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
6006 log_is_enabled(Info, class, preview)) {
6007 ResourceMark rm;
6008 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
6009 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
6010 }
6011
6012 if (log_is_enabled(Debug, class, resolve)) {
6013 ResourceMark rm;
6014 // print out the superclass.
6164 _protection_domain(protection_domain),
6165 _access_flags(),
6166 _pub_level(pub_level),
6167 _bad_constant_seen(0),
6168 _synthetic_flag(false),
6169 _sde_length(false),
6170 _sde_buffer(NULL),
6171 _sourcefile_index(0),
6172 _generic_signature_index(0),
6173 _major_version(0),
6174 _minor_version(0),
6175 _this_class_index(0),
6176 _super_class_index(0),
6177 _itfs_len(0),
6178 _java_fields_count(0),
6179 _need_verify(false),
6180 _relax_verify(false),
6181 _has_nonstatic_concrete_methods(false),
6182 _declares_nonstatic_concrete_methods(false),
6183 _has_final_method(false),
6184 _has_flattenable_fields(false),
6185 _is_empty_value(false),
6186 _has_finalizer(false),
6187 _has_empty_finalizer(false),
6188 _has_vanilla_constructor(false),
6189 _max_bootstrap_specifier_index(-1) {
6190
6191 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6192 _class_name->increment_refcount();
6193
6194 assert(THREAD->is_Java_thread(), "invariant");
6195 assert(_loader_data != NULL, "invariant");
6196 assert(stream != NULL, "invariant");
6197 assert(_stream != NULL, "invariant");
6198 assert(_stream->buffer() == _stream->current(), "invariant");
6199 assert(_class_name != NULL, "invariant");
6200 assert(0 == _access_flags.as_int(), "invariant");
6201
6202 // Figure out whether we can skip format checking (matching classic VM behavior)
6203 if (DumpSharedSpaces) {
6204 // verify == true means it's a 'remote' class (i.e., non-boot class)
6205 // Verification decision is based on BytecodeVerificationRemote flag
6361
6362 _orig_cp_size = cp_size;
6363 if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6364 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6365 }
6366 cp_size += _max_num_patched_klasses;
6367
6368 _cp = ConstantPool::allocate(_loader_data,
6369 cp_size,
6370 CHECK);
6371
6372 ConstantPool* const cp = _cp;
6373
6374 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6375
6376 assert(cp_size == (const u2)cp->length(), "invariant");
6377
6378 // ACCESS FLAGS
6379 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6380
6381 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6382 // JVM_ACC_MODULE is defined in JDK-9 and later.
6383 if (_major_version >= JAVA_9_VERSION) {
6384 recognized_modifiers |= JVM_ACC_MODULE;
6385 }
6386 // JVM_ACC_VALUE is defined for class file version 55 and later
6387 if (supports_value_types()) {
6388 recognized_modifiers |= JVM_ACC_VALUE;
6389 }
6390
6391 // Access flags
6392 jint flags = stream->get_u2_fast() & recognized_modifiers;
6393
6394 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6395 // Set abstract bit for old class files for backward compatibility
6396 flags |= JVM_ACC_ABSTRACT;
6397 }
6398
6399 verify_legal_class_modifiers(flags, CHECK);
6400
6401 short bad_constant = class_bad_constant_seen();
6402 if (bad_constant != 0) {
6403 // Do not throw CFE until after the access_flags are checked because if
6404 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6405 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6406 }
6407
6408 _access_flags.set_flags(flags);
6409
6410 // This class and superclass
6411 _this_class_index = stream->get_u2_fast();
6412 check_property(
6413 valid_cp_range(_this_class_index, cp_size) &&
6508 _super_class_index = stream->get_u2_fast();
6509 _super_klass = parse_super_class(cp,
6510 _super_class_index,
6511 _need_verify,
6512 CHECK);
6513
6514 // Interfaces
6515 _itfs_len = stream->get_u2_fast();
6516 parse_interfaces(stream,
6517 _itfs_len,
6518 cp,
6519 &_has_nonstatic_concrete_methods,
6520 CHECK);
6521
6522 assert(_local_interfaces != NULL, "invariant");
6523
6524 // Fields (offsets are filled in later)
6525 _fac = new FieldAllocationCount();
6526 parse_fields(stream,
6527 _access_flags.is_interface(),
6528 _access_flags.is_value_type(),
6529 _fac,
6530 cp,
6531 cp_size,
6532 &_java_fields_count,
6533 CHECK);
6534
6535 assert(_fields != NULL, "invariant");
6536
6537 // Methods
6538 AccessFlags promoted_flags;
6539 parse_methods(stream,
6540 _access_flags.is_interface(),
6541 _access_flags.is_value_type(),
6542 &promoted_flags,
6543 &_has_final_method,
6544 &_declares_nonstatic_concrete_methods,
6545 CHECK);
6546
6547 assert(_methods != NULL, "invariant");
6548
6549 // promote flags from parse_methods() to the klass' flags
6550 _access_flags.add_promoted_flags(promoted_flags.as_int());
6551
6552 if (_declares_nonstatic_concrete_methods) {
6553 _has_nonstatic_concrete_methods = true;
6554 }
6555
6556 // Additional attributes/annotations
6557 _parsed_annotations = new ClassAnnotationCollector();
6558 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6559
6560 assert(_inner_classes != NULL, "invariant");
6561
6603 true,
6604 CHECK);
6605 }
6606
6607 if (_super_klass != NULL) {
6608 if (_super_klass->has_nonstatic_concrete_methods()) {
6609 _has_nonstatic_concrete_methods = true;
6610 }
6611
6612 if (_super_klass->is_interface()) {
6613 ResourceMark rm(THREAD);
6614 Exceptions::fthrow(
6615 THREAD_AND_LOCATION,
6616 vmSymbols::java_lang_IncompatibleClassChangeError(),
6617 "class %s has interface %s as super class",
6618 _class_name->as_klass_external_name(),
6619 _super_klass->external_name()
6620 );
6621 return;
6622 }
6623
6624 // For a value class, only java/lang/Object is an acceptable super class
6625 if (_access_flags.get_flags() & JVM_ACC_VALUE) {
6626 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(),
6627 "Value type must have java.lang.Object as superclass in class file %s",
6628 CHECK);
6629 }
6630
6631 // Make sure super class is not final
6632 if (_super_klass->is_final()) {
6633 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6634 }
6635 }
6636
6637 // Compute the transitive list of all unique interfaces implemented by this class
6638 _transitive_interfaces =
6639 compute_transitive_interfaces(_super_klass,
6640 _local_interfaces,
6641 _loader_data,
6642 CHECK);
6643
6644 assert(_transitive_interfaces != NULL, "invariant");
6645
6646 // sort methods
6647 _method_ordering = sort_methods(_methods);
6648
6649 _all_mirandas = new GrowableArray<Method*>(20);
6650
6651 Handle loader(THREAD, _loader_data->class_loader());
6652 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6653 &_num_miranda_methods,
6654 _all_mirandas,
6655 _super_klass,
6656 _methods,
6657 _access_flags,
6658 _major_version,
6659 loader,
6660 _class_name,
6661 _local_interfaces,
6662 CHECK);
6663
6664 // Size of Java itable (in words)
6665 _itable_size = _access_flags.is_interface() ? 0 :
6666 klassItable::compute_itable_size(_transitive_interfaces);
6667
6668 assert(_fac != NULL, "invariant");
6669 assert(_parsed_annotations != NULL, "invariant");
6670
6671
6672 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
6673 if (fs.is_flattenable() && !fs.access_flags().is_static()) {
6674 // Pre-load value class
6675 Klass* klass = SystemDictionary::resolve_flattenable_field_or_fail(&fs,
6676 Handle(THREAD, _loader_data->class_loader()),
6677 _protection_domain, true, CHECK);
6678 assert(klass != NULL, "Sanity check");
6679 assert(klass->access_flags().is_value_type(), "Value type expected");
6680 _has_flattenable_fields = true;
6681 }
6682 }
6683
6684 _field_info = new FieldLayoutInfo();
6685 if (UseNewLayout) {
6686 FieldLayoutBuilder lb(this, _field_info);
6687 if (this->is_value_type()) {
6688 lb.compute_inline_class_layout(CHECK);
6689 _alignment = lb.get_alignment();
6690 _first_field_offset = lb.get_first_field_offset();
6691 _exact_size_in_bytes = lb.get_exact_size_in_byte();
6692 } else {
6693 lb.compute_regular_layout(CHECK);
6694 }
6695 } else {
6696 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6697 }
6698
6699 // Compute reference type
6700 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6701
6702 }
6703
6704 void ClassFileParser::set_klass(InstanceKlass* klass) {
6705
6706 #ifdef ASSERT
6707 if (klass != NULL) {
6708 assert(NULL == _klass, "leaking?");
6709 }
6710 #endif
6711
6712 _klass = klass;
6713 }
6714
6715 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6716
6717 #ifdef ASSERT
6718 if (klass != NULL) {
6719 assert(NULL == _klass_to_deallocate, "leaking?");
6720 }
6721 #endif
6722
6723 _klass_to_deallocate = klass;
6724 }
6725
6726 // Caller responsible for ResourceMark
6727 // clone stream with rewound position
6728 const ClassFileStream* ClassFileParser::clone_stream() const {
6729 assert(_stream != NULL, "invariant");
6730
6731 return _stream->clone();
6732 }
6733
6734 // ----------------------------------------------------------------------------
6735 // debugging
6736
6737 #ifdef ASSERT
6738
6739 // return true if class_name contains no '.' (internal format is '/')
6740 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6741 if (class_name != NULL) {
6742 ResourceMark rm;
6743 char* name = class_name->as_C_string();
6744 return strchr(name, '.') == NULL;
6745 } else {
6746 return true;
6747 }
6748 }
6749
6750 #endif
|