1 /*
2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_CLASSFILE_CLASSFILEPARSER_HPP
26 #define SHARE_CLASSFILE_CLASSFILEPARSER_HPP
27
28 #include "memory/referenceType.hpp"
29 #include "oops/annotations.hpp"
30 #include "oops/constantPool.hpp"
31 #include "oops/fieldInfo.hpp"
32 #include "oops/instanceKlass.hpp"
33 #include "oops/typeArrayOop.hpp"
34 #include "utilities/accessFlags.hpp"
35
36 class Annotations;
37 template <typename T>
38 class Array;
39 class ClassFileStream;
40 class ClassLoaderData;
41 class ClassLoadInfo;
42 class ClassInstanceInfo;
43 class CompressedLineNumberWriteStream;
44 class ConstMethod;
45 class FieldInfo;
46 template <typename T>
47 class GrowableArray;
48 class InstanceKlass;
49 class RecordComponent;
50 class Symbol;
51 class FieldLayoutBuilder;
52
53 // Utility to collect and compact oop maps during layout
54 class OopMapBlocksBuilder : public ResourceObj {
55 public:
56 OopMapBlock* _nonstatic_oop_maps;
57 unsigned int _nonstatic_oop_map_count;
58 unsigned int _max_nonstatic_oop_maps;
59
60 OopMapBlocksBuilder(unsigned int max_blocks);
61 OopMapBlock* last_oop_map() const;
62 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks);
63 void add(int offset, int count);
64 void copy(OopMapBlock* dst);
65 void compact();
66 void print_on(outputStream* st) const;
67 void print_value_on(outputStream* st) const;
68 };
69
70 // Values needed for oopmap and InstanceKlass creation
71 class FieldLayoutInfo : public ResourceObj {
72 public:
73 OopMapBlocksBuilder* oop_map_blocks;
74 int _instance_size;
75 int _nonstatic_field_size;
76 int _static_field_size;
77 bool _has_nonstatic_fields;
78 bool _is_naturally_atomic;
79 bool _has_inline_fields;
80 };
81
82 // Parser for for .class files
83 //
84 // The bytes describing the class file structure is read from a Stream object
85
86 class ClassFileParser {
87 friend class FieldLayoutBuilder;
88 friend class FieldLayout;
89
90 class ClassAnnotationCollector;
91 class FieldAllocationCount;
92 class FieldAnnotationCollector;
93
94 public:
95 // The ClassFileParser has an associated "publicity" level
96 // It is used to control which subsystems (if any)
97 // will observe the parsing (logging, events, tracing).
98 // Default level is "BROADCAST", which is equivalent to
99 // a "public" parsing attempt.
100 //
101 // "INTERNAL" level should be entirely private to the
102 // caller - this allows for internal reuse of ClassFileParser
103 //
104 enum Publicity {
105 INTERNAL,
106 BROADCAST
107 };
108
109 enum { LegalClass, LegalField, LegalMethod }; // used to verify unqualified names
110
111 private:
112 // Potentially unaligned pointer to various 16-bit entries in the class file
113 typedef void unsafe_u2;
114
115 const ClassFileStream* _stream; // Actual input stream
116 Symbol* _class_name;
117 mutable ClassLoaderData* _loader_data;
118 const bool _is_hidden;
119 const bool _can_access_vm_annotations;
120 int _orig_cp_size;
121
122 // Metadata created before the instance klass is created. Must be deallocated
123 // if not transferred to the InstanceKlass upon successful class loading
124 // in which case these pointers have been set to null.
125 const InstanceKlass* _super_klass;
126 ConstantPool* _cp;
127 Array<u1>* _fieldinfo_stream;
128 Array<FieldStatus>* _fields_status;
129 Array<Method*>* _methods;
130 Array<u2>* _inner_classes;
131 Array<u2>* _nest_members;
132 u2 _nest_host;
133 Array<u2>* _permitted_subclasses;
134 Array<u2>* _preload_classes;
135 Array<RecordComponent*>* _record_components;
136 Array<InstanceKlass*>* _local_interfaces;
137 GrowableArray<u2>* _local_interface_indexes;
138 Array<InstanceKlass*>* _transitive_interfaces;
139 Annotations* _combined_annotations;
140 AnnotationArray* _class_annotations;
141 AnnotationArray* _class_type_annotations;
142 Array<AnnotationArray*>* _fields_annotations;
143 Array<AnnotationArray*>* _fields_type_annotations;
144 InstanceKlass* _klass; // InstanceKlass* once created.
145 InstanceKlass* _klass_to_deallocate; // an InstanceKlass* to be destroyed
146
147 ClassAnnotationCollector* _parsed_annotations;
148 FieldAllocationCount* _fac;
149 FieldLayoutInfo* _field_info;
150 Array<InlineKlass*>* _inline_type_field_klasses;
151 GrowableArray<FieldInfo>* _temp_field_info;
152 const intArray* _method_ordering;
153 GrowableArray<Method*>* _all_mirandas;
154
155 enum { fixed_buffer_size = 128 };
156 u_char _linenumbertable_buffer[fixed_buffer_size];
157
158 // Size of Java vtable (in words)
159 int _vtable_size;
160 int _itable_size;
161
162 int _num_miranda_methods;
163
164 int _alignment;
165 int _first_field_offset;
166 int _exact_size_in_bytes;
167
168 Handle _protection_domain;
169 AccessFlags _access_flags;
170
171 // for tracing and notifications
172 Publicity _pub_level;
173
174 // Used to keep track of whether a constant pool item 19 or 20 is found. These
175 // correspond to CONSTANT_Module and CONSTANT_Package tags and are not allowed
176 // in regular class files. For class file version >= 53, a CFE cannot be thrown
177 // immediately when these are seen because a NCDFE must be thrown if the class's
178 // access_flags have ACC_MODULE set. But, the access_flags haven't been looked
179 // at yet. So, the bad constant pool item is cached here. A value of zero
180 // means that no constant pool item 19 or 20 was found.
181 short _bad_constant_seen;
182
183 // class attributes parsed before the instance klass is created:
184 bool _synthetic_flag;
185 int _sde_length;
186 const char* _sde_buffer;
187 u2 _sourcefile_index;
188 u2 _generic_signature_index;
189
190 u2 _major_version;
191 u2 _minor_version;
192 u2 _this_class_index;
193 u2 _super_class_index;
194 u2 _itfs_len;
195 u2 _java_fields_count;
196
197 bool _need_verify;
198 bool _relax_verify;
199
200 bool _has_nonstatic_concrete_methods;
201 bool _declares_nonstatic_concrete_methods;
202 bool _has_localvariable_table;
203 bool _has_final_method;
204 bool _has_contended_fields;
205
206 bool _has_inline_type_fields;
207 bool _has_nonstatic_fields;
208 bool _is_empty_inline_type;
209 bool _is_naturally_atomic;
210 bool _is_declared_atomic;
211 bool _carries_value_modifier; // Has ACC_VALUE mddifier or one of its super types has
212 bool _carries_identity_modifier; // Has ACC_IDENTITY modifier or one of its super types has
213
214 // precomputed flags
215 bool _has_finalizer;
216 bool _has_empty_finalizer;
217 bool _has_vanilla_constructor;
218 int _max_bootstrap_specifier_index; // detects BSS values
219
220 void parse_stream(const ClassFileStream* const stream, TRAPS);
221
222 void mangle_hidden_class_name(InstanceKlass* const ik);
223
224 void post_process_parsed_stream(const ClassFileStream* const stream,
225 ConstantPool* cp,
226 TRAPS);
227
228 void fill_instance_klass(InstanceKlass* ik, bool cf_changed_in_CFLH,
229 const ClassInstanceInfo& cl_inst_info, TRAPS);
230
231 void set_klass(InstanceKlass* instance);
232
233 void set_class_bad_constant_seen(short bad_constant);
234 short class_bad_constant_seen() { return _bad_constant_seen; }
235 void set_class_synthetic_flag(bool x) { _synthetic_flag = x; }
236 void set_class_sourcefile_index(u2 x) { _sourcefile_index = x; }
237 void set_class_generic_signature_index(u2 x) { _generic_signature_index = x; }
238 void set_class_sde_buffer(const char* x, int len) { _sde_buffer = x; _sde_length = len; }
239
240 void create_combined_annotations(TRAPS);
241 void apply_parsed_class_attributes(InstanceKlass* k); // update k
242 void apply_parsed_class_metadata(InstanceKlass* k, int fields_count);
243 void clear_class_metadata();
244
245 // Constant pool parsing
246 void parse_constant_pool_entries(const ClassFileStream* const stream,
247 ConstantPool* cp,
248 const int length,
249 TRAPS);
250
251 void parse_constant_pool(const ClassFileStream* const cfs,
252 ConstantPool* const cp,
253 const int length,
254 TRAPS);
255
256 // Interface parsing
257 void parse_interfaces(const ClassFileStream* const stream,
258 const int itfs_len,
259 ConstantPool* const cp,
260 bool* has_nonstatic_concrete_methods,
261 bool* is_declared_atomic,
262 TRAPS);
263
264 const InstanceKlass* parse_super_class(ConstantPool* const cp,
265 const int super_class_index,
266 const bool need_verify,
267 TRAPS);
268
269 // Field parsing
270 void parse_field_attributes(const ClassFileStream* const cfs,
271 u2 attributes_count,
272 bool is_static,
273 u2 signature_index,
274 u2* const constantvalue_index_addr,
275 bool* const is_synthetic_addr,
276 u2* const generic_signature_index_addr,
277 FieldAnnotationCollector* parsed_annotations,
278 TRAPS);
279
280 void parse_fields(const ClassFileStream* const cfs,
281 AccessFlags class_access_flags,
282 FieldAllocationCount* const fac,
283 ConstantPool* cp,
284 const int cp_size,
285 u2* const java_fields_count_ptr,
286 TRAPS);
287
288 // Method parsing
289 Method* parse_method(const ClassFileStream* const cfs,
290 bool is_interface,
291 bool is_value_class,
292 bool is_abstract_class,
293 const ConstantPool* cp,
294 bool* const has_localvariable_table,
295 TRAPS);
296
297 void parse_methods(const ClassFileStream* const cfs,
298 bool is_interface,
299 bool is_value_class,
300 bool is_abstract_class,
301 bool* const has_localvariable_table,
302 bool* const has_final_method,
303 bool* const declares_nonstatic_concrete_methods,
304 TRAPS);
305
306 const unsafe_u2* parse_exception_table(const ClassFileStream* const stream,
307 u4 code_length,
308 u4 exception_table_length,
309 TRAPS);
310
311 void parse_linenumber_table(u4 code_attribute_length,
312 u4 code_length,
313 CompressedLineNumberWriteStream**const write_stream,
314 TRAPS);
315
316 const unsafe_u2* parse_localvariable_table(const ClassFileStream* const cfs,
317 u4 code_length,
318 u2 max_locals,
319 u4 code_attribute_length,
320 u2* const localvariable_table_length,
321 bool isLVTT,
322 TRAPS);
323
324 const unsafe_u2* parse_checked_exceptions(const ClassFileStream* const cfs,
325 u2* const checked_exceptions_length,
326 u4 method_attribute_length,
327 TRAPS);
328
329 // Classfile attribute parsing
330 u2 parse_generic_signature_attribute(const ClassFileStream* const cfs, TRAPS);
331 void parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, TRAPS);
332 void parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
333 int length,
334 TRAPS);
335
336 // Check for circularity in InnerClasses attribute.
337 bool check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS);
338
339 u2 parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
340 const ConstantPool* cp,
341 const u1* const inner_classes_attribute_start,
342 bool parsed_enclosingmethod_attribute,
343 u2 enclosing_method_class_index,
344 u2 enclosing_method_method_index,
345 TRAPS);
346
347 u2 parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
348 const u1* const nest_members_attribute_start,
349 TRAPS);
350
351 u2 parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
352 const u1* const permitted_subclasses_attribute_start,
353 TRAPS);
354
355 u2 parse_classfile_preload_attribute(const ClassFileStream* const cfs,
356 const u1* const preload_attribute_start,
357 TRAPS);
358
359 u2 parse_classfile_record_attribute(const ClassFileStream* const cfs,
360 const ConstantPool* cp,
361 const u1* const record_attribute_start,
362 TRAPS);
363
364 void parse_classfile_attributes(const ClassFileStream* const cfs,
365 ConstantPool* cp,
366 ClassAnnotationCollector* parsed_annotations,
367 TRAPS);
368
369 void parse_classfile_synthetic_attribute();
370 void parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS);
371 void parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
372 ConstantPool* cp,
373 u4 attribute_length,
374 TRAPS);
375
376 // Annotations handling
377 AnnotationArray* assemble_annotations(const u1* const runtime_visible_annotations,
378 int runtime_visible_annotations_length,
379 const u1* const runtime_invisible_annotations,
380 int runtime_invisible_annotations_length,
381 TRAPS);
382
383 void set_precomputed_flags(InstanceKlass* k);
384
385 // Format checker methods
386 void classfile_parse_error(const char* msg, TRAPS) const;
387 void classfile_parse_error(const char* msg, int index, TRAPS) const;
388 void classfile_parse_error(const char* msg, const char *name, TRAPS) const;
389 void classfile_parse_error(const char* msg,
390 int index,
391 const char *name,
392 TRAPS) const;
393 void classfile_parse_error(const char* msg,
394 const char* name,
395 const char* signature,
396 TRAPS) const;
397
398 void classfile_icce_error(const char* msg,
399 const Klass* k,
400 TRAPS) const;
401
402 void classfile_ucve_error(const char* msg,
403 const Symbol* class_name,
404 u2 major,
405 u2 minor,
406 TRAPS) const;
407
408 inline void guarantee_property(bool b, const char* msg, TRAPS) const {
409 if (!b) { classfile_parse_error(msg, THREAD); return; }
410 }
411
412 void report_assert_property_failure(const char* msg, TRAPS) const PRODUCT_RETURN;
413 void report_assert_property_failure(const char* msg, int index, TRAPS) const PRODUCT_RETURN;
414
415 inline void assert_property(bool b, const char* msg, TRAPS) const {
416 #ifdef ASSERT
417 if (!b) {
418 report_assert_property_failure(msg, THREAD);
419 }
420 #endif
421 }
422
423 inline void assert_property(bool b, const char* msg, int index, TRAPS) const {
424 #ifdef ASSERT
425 if (!b) {
426 report_assert_property_failure(msg, index, THREAD);
427 }
428 #endif
429 }
430
431 inline void check_property(bool property,
432 const char* msg,
433 int index,
434 TRAPS) const {
435 if (_need_verify) {
436 guarantee_property(property, msg, index, CHECK);
437 } else {
438 assert_property(property, msg, index, CHECK);
439 }
440 }
441
442 inline void check_property(bool property, const char* msg, TRAPS) const {
443 if (_need_verify) {
444 guarantee_property(property, msg, CHECK);
445 } else {
446 assert_property(property, msg, CHECK);
447 }
448 }
449
450 inline void guarantee_property(bool b,
451 const char* msg,
452 int index,
453 TRAPS) const {
454 if (!b) { classfile_parse_error(msg, index, THREAD); return; }
455 }
456
457 inline void guarantee_property(bool b,
458 const char* msg,
459 const char *name,
460 TRAPS) const {
461 if (!b) { classfile_parse_error(msg, name, THREAD); return; }
462 }
463
464 inline void guarantee_property(bool b,
465 const char* msg,
466 int index,
467 const char *name,
468 TRAPS) const {
469 if (!b) { classfile_parse_error(msg, index, name, THREAD); return; }
470 }
471
472 void throwIllegalSignature(const char* type,
473 const Symbol* name,
474 const Symbol* sig,
475 TRAPS) const;
476
477 void throwInlineTypeLimitation(THREAD_AND_LOCATION_DECL,
478 const char* msg,
479 const Symbol* name = nullptr,
480 const Symbol* sig = nullptr) const;
481
482 void verify_constantvalue(const ConstantPool* const cp,
483 int constantvalue_index,
484 int signature_index,
485 TRAPS) const;
486
487 void verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) const;
488 void verify_legal_class_name(const Symbol* name, TRAPS) const;
489 void verify_legal_field_name(const Symbol* name, TRAPS) const;
490 void verify_legal_method_name(const Symbol* name, TRAPS) const;
491
492 void verify_legal_field_signature(const Symbol* fieldname,
493 const Symbol* signature,
494 TRAPS) const;
495 int verify_legal_method_signature(const Symbol* methodname,
496 const Symbol* signature,
497 TRAPS) const;
498 void verify_legal_name_with_signature(const Symbol* name,
499 const Symbol* signature,
500 TRAPS) const;
501
502 void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS);
503
504 void verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const;
505 void verify_legal_field_modifiers(jint flags,
506 AccessFlags class_access_flags,
507 TRAPS) const;
508 void verify_legal_method_modifiers(jint flags,
509 AccessFlags class_access_flags,
510 const Symbol* name,
511 TRAPS) const;
512
513 void check_super_class_access(const InstanceKlass* this_klass,
514 TRAPS);
515
516 void check_super_interface_access(const InstanceKlass* this_klass,
517 TRAPS);
518
519 const char* skip_over_field_signature(const char* signature,
520 bool void_ok,
521 unsigned int length,
522 TRAPS) const;
523
524 // Wrapper for constantTag.is_klass_[or_]reference.
525 // In older versions of the VM, Klass*s cannot sneak into early phases of
526 // constant pool construction, but in later versions they can.
527 // %%% Let's phase out the old is_klass_reference.
528 bool valid_klass_reference_at(int index) const {
529 return _cp->is_within_bounds(index) &&
530 _cp->tag_at(index).is_klass_or_reference();
531 }
532
533 // Checks that the cpool index is in range and is a utf8
534 bool valid_symbol_at(int cpool_index) const {
535 return _cp->is_within_bounds(cpool_index) &&
536 _cp->tag_at(cpool_index).is_utf8();
537 }
538
539 void copy_localvariable_table(const ConstMethod* cm,
540 int lvt_cnt,
541 u2* const localvariable_table_length,
542 const unsafe_u2** const localvariable_table_start,
543 int lvtt_cnt,
544 u2* const localvariable_type_table_length,
545 const unsafe_u2** const localvariable_type_table_start,
546 TRAPS);
547
548 void copy_method_annotations(ConstMethod* cm,
549 const u1* runtime_visible_annotations,
550 int runtime_visible_annotations_length,
551 const u1* runtime_invisible_annotations,
552 int runtime_invisible_annotations_length,
553 const u1* runtime_visible_parameter_annotations,
554 int runtime_visible_parameter_annotations_length,
555 const u1* runtime_invisible_parameter_annotations,
556 int runtime_invisible_parameter_annotations_length,
557 const u1* runtime_visible_type_annotations,
558 int runtime_visible_type_annotations_length,
559 const u1* runtime_invisible_type_annotations,
560 int runtime_invisible_type_annotations_length,
561 const u1* annotation_default,
562 int annotation_default_length,
563 TRAPS);
564
565 void update_class_name(Symbol* new_name);
566
567 // Check if the class file supports inline types
568 bool supports_inline_types() const;
569
570 public:
571 ClassFileParser(ClassFileStream* stream,
572 Symbol* name,
573 ClassLoaderData* loader_data,
574 const ClassLoadInfo* cl_info,
575 Publicity pub_level,
576 TRAPS);
577
578 ~ClassFileParser();
579
580 InstanceKlass* create_instance_klass(bool cf_changed_in_CFLH, const ClassInstanceInfo& cl_inst_info, TRAPS);
581
582 const ClassFileStream* clone_stream() const;
583
584 void set_klass_to_deallocate(InstanceKlass* klass);
585
586 int static_field_size() const;
587 int total_oop_map_count() const;
588 jint layout_size() const;
589
590 int vtable_size() const { return _vtable_size; }
591 int itable_size() const { return _itable_size; }
592
593 u2 this_class_index() const { return _this_class_index; }
594
595 bool is_hidden() const { return _is_hidden; }
596 bool is_interface() const { return _access_flags.is_interface(); }
597 bool is_inline_type() const { return _access_flags.is_value_class() && !_access_flags.is_interface() && !_access_flags.is_abstract(); }
598 bool is_value_class() const { return _access_flags.is_value_class(); }
599 bool is_abstract_class() const { return _access_flags.is_abstract(); }
600 bool is_identity_class() const { return _access_flags.is_identity_class(); }
601 bool is_value_capable_class() const;
602 bool has_inline_fields() const { return _has_inline_type_fields; }
603 bool carries_identity_modifier() const { return _carries_identity_modifier; }
604 void set_carries_identity_modifier() { _carries_identity_modifier = true; }
605 bool carries_value_modifier() const { return _carries_value_modifier; }
606 void set_carries_value_modifier() { _carries_value_modifier = true; }
607
608 u2 java_fields_count() const { return _java_fields_count; }
609
610 ClassLoaderData* loader_data() const { return _loader_data; }
611 const Symbol* class_name() const { return _class_name; }
612 const InstanceKlass* super_klass() const { return _super_klass; }
613
614 ReferenceType super_reference_type() const;
615 bool is_instance_ref_klass() const;
616 bool is_java_lang_ref_Reference_subclass() const;
617
618 AccessFlags access_flags() const { return _access_flags; }
619
620 bool is_internal() const { return INTERNAL == _pub_level; }
621
622 static bool verify_unqualified_name(const char* name, unsigned int length, int type);
623
624 #ifdef ASSERT
625 static bool is_internal_format(Symbol* class_name);
626 #endif
627
628 };
629
630 #endif // SHARE_CLASSFILE_CLASSFILEPARSER_HPP