1 /*
2 * Copyright (c) 1997, 2024, 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 int _payload_alignment;
78 int _payload_offset;
79 int _payload_size_in_bytes;
80 int _non_atomic_size_in_bytes;
81 int _non_atomic_alignment;
82 int _atomic_layout_size_in_bytes;
83 int _nullable_layout_size_in_bytes;
84 int _null_marker_offset;
85 int _null_reset_value_offset;
86 bool _has_nonstatic_fields;
87 bool _is_naturally_atomic;
88 bool _must_be_atomic;
89 bool _has_inline_fields;
90 bool _is_empty_inline_klass;
91 };
92
93 // Parser for for .class files
94 //
95 // The bytes describing the class file structure is read from a Stream object
96
97 class ClassFileParser {
98 friend class FieldLayoutBuilder;
99 friend class FieldLayout;
100
101 class ClassAnnotationCollector;
102 class FieldAnnotationCollector;
103
104 public:
105 // The ClassFileParser has an associated "publicity" level
106 // It is used to control which subsystems (if any)
107 // will observe the parsing (logging, events, tracing).
108 // Default level is "BROADCAST", which is equivalent to
109 // a "public" parsing attempt.
110 //
111 // "INTERNAL" level should be entirely private to the
112 // caller - this allows for internal reuse of ClassFileParser
113 //
114 enum Publicity {
115 INTERNAL,
116 BROADCAST
117 };
118
119 enum { LegalClass, LegalField, LegalMethod }; // used to verify unqualified names
120
121 private:
122 // Potentially unaligned pointer to various 16-bit entries in the class file
123 typedef void unsafe_u2;
124
125 const ClassFileStream* _stream; // Actual input stream
126 Symbol* _class_name;
127 mutable ClassLoaderData* _loader_data;
128 const bool _is_hidden;
129 const bool _can_access_vm_annotations;
130 int _orig_cp_size;
131 unsigned int _static_oop_count;
132
133 // Metadata created before the instance klass is created. Must be deallocated
134 // if not transferred to the InstanceKlass upon successful class loading
135 // in which case these pointers have been set to null.
136 const InstanceKlass* _super_klass;
137 ConstantPool* _cp;
138 Array<u1>* _fieldinfo_stream;
139 Array<FieldStatus>* _fields_status;
140 Array<Method*>* _methods;
141 Array<u2>* _inner_classes;
142 Array<u2>* _nest_members;
143 u2 _nest_host;
144 Array<u2>* _permitted_subclasses;
145 Array<u2>* _loadable_descriptors;
146 Array<RecordComponent*>* _record_components;
147 Array<InstanceKlass*>* _local_interfaces;
148 GrowableArray<u2>* _local_interface_indexes;
149 Array<InstanceKlass*>* _transitive_interfaces;
150 Annotations* _combined_annotations;
151 AnnotationArray* _class_annotations;
152 AnnotationArray* _class_type_annotations;
153 Array<AnnotationArray*>* _fields_annotations;
154 Array<AnnotationArray*>* _fields_type_annotations;
155 InstanceKlass* _klass; // InstanceKlass* once created.
156 InstanceKlass* _klass_to_deallocate; // an InstanceKlass* to be destroyed
157
158 ClassAnnotationCollector* _parsed_annotations;
159 FieldLayoutInfo* _layout_info;
160 Array<InlineLayoutInfo>* _inline_layout_info_array;
161 GrowableArray<FieldInfo>* _temp_field_info;
162 const intArray* _method_ordering;
163 GrowableArray<Method*>* _all_mirandas;
164
165 enum { fixed_buffer_size = 128 };
166 u_char _linenumbertable_buffer[fixed_buffer_size];
167
168 // Size of Java vtable (in words)
169 int _vtable_size;
170 int _itable_size;
171
172 int _num_miranda_methods;
173
174
175 Handle _protection_domain;
176 AccessFlags _access_flags;
177
178 // for tracing and notifications
179 Publicity _pub_level;
180
181 // Used to keep track of whether a constant pool item 19 or 20 is found. These
182 // correspond to CONSTANT_Module and CONSTANT_Package tags and are not allowed
183 // in regular class files. For class file version >= 53, a CFE cannot be thrown
184 // immediately when these are seen because a NCDFE must be thrown if the class's
185 // access_flags have ACC_MODULE set. But, the access_flags haven't been looked
186 // at yet. So, the bad constant pool item is cached here. A value of zero
187 // means that no constant pool item 19 or 20 was found.
188 short _bad_constant_seen;
189
190 // class attributes parsed before the instance klass is created:
191 bool _synthetic_flag;
192 int _sde_length;
193 const char* _sde_buffer;
194 u2 _sourcefile_index;
195 u2 _generic_signature_index;
196
197 u2 _major_version;
198 u2 _minor_version;
199 u2 _this_class_index;
200 u2 _super_class_index;
201 u2 _itfs_len;
202 u2 _java_fields_count;
203
204 bool _need_verify;
205
206 bool _has_nonstatic_concrete_methods;
207 bool _declares_nonstatic_concrete_methods;
208 bool _has_localvariable_table;
209 bool _has_final_method;
210 bool _has_contended_fields;
211
212 bool _has_inline_type_fields;
213 bool _is_naturally_atomic;
214 bool _must_be_atomic;
215 bool _has_loosely_consistent_annotation;
216
217 // precomputed flags
218 bool _has_finalizer;
219 bool _has_empty_finalizer;
220 int _max_bootstrap_specifier_index; // detects BSS values
221
222 void parse_stream(const ClassFileStream* const stream, TRAPS);
223
224 void mangle_hidden_class_name(InstanceKlass* const ik);
225
226 void post_process_parsed_stream(const ClassFileStream* const stream,
227 ConstantPool* cp,
228 TRAPS);
229
230 void fill_instance_klass(InstanceKlass* ik, bool cf_changed_in_CFLH,
231 const ClassInstanceInfo& cl_inst_info, TRAPS);
232
233 void set_klass(InstanceKlass* instance);
234
235 void set_class_bad_constant_seen(short bad_constant);
236 short class_bad_constant_seen() { return _bad_constant_seen; }
237 void set_class_synthetic_flag(bool x) { _synthetic_flag = x; }
238 void set_class_sourcefile_index(u2 x) { _sourcefile_index = x; }
239 void set_class_generic_signature_index(u2 x) { _generic_signature_index = x; }
240 void set_class_sde_buffer(const char* x, int len) { _sde_buffer = x; _sde_length = len; }
241
242 void create_combined_annotations(TRAPS);
243 void apply_parsed_class_attributes(InstanceKlass* k); // update k
244 void apply_parsed_class_metadata(InstanceKlass* k, int fields_count);
245 void clear_class_metadata();
246
247 // Constant pool parsing
248 void parse_constant_pool_entries(const ClassFileStream* const stream,
249 ConstantPool* cp,
250 const int length,
251 TRAPS);
252
253 void parse_constant_pool(const ClassFileStream* const cfs,
254 ConstantPool* const cp,
255 const int length,
256 TRAPS);
257
258 // Interface parsing
259 void parse_interfaces(const ClassFileStream* const stream,
260 const int itfs_len,
261 ConstantPool* const cp,
262 bool* has_nonstatic_concrete_methods,
263 TRAPS);
264
265 const InstanceKlass* parse_super_class(ConstantPool* const cp,
266 const int super_class_index,
267 const bool need_verify,
268 TRAPS);
269
270 // Field parsing
271 void parse_field_attributes(const ClassFileStream* const cfs,
272 u2 attributes_count,
273 bool is_static,
274 u2 signature_index,
275 u2* const constantvalue_index_addr,
276 bool* const is_synthetic_addr,
277 u2* const generic_signature_index_addr,
278 FieldAnnotationCollector* parsed_annotations,
279 TRAPS);
280
281 void parse_fields(const ClassFileStream* const cfs,
282 AccessFlags class_access_flags,
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_loadable_descriptors_attribute(const ClassFileStream* const cfs,
356 const u1* const loadable_descriptors_attribute_start,
357 TRAPS);
358
359 u4 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* allocate_annotations(const u1* const anno,
378 int anno_length,
379 TRAPS);
380
381 void set_precomputed_flags(InstanceKlass* k);
382
383 // Format checker methods
384 void classfile_parse_error(const char* msg, TRAPS) const;
385 void classfile_parse_error(const char* msg, int index, TRAPS) const;
386 void classfile_parse_error(const char* msg, const char *name, TRAPS) const;
387 void classfile_parse_error(const char* msg,
388 int index,
389 const char *name,
390 TRAPS) const;
391 void classfile_parse_error(const char* msg,
392 const char* name,
393 const char* signature,
394 TRAPS) const;
395
396 void classfile_icce_error(const char* msg,
397 const Klass* k,
398 TRAPS) const;
399
400 // Uses msg directly in the ICCE, with no additional content
401 void classfile_icce_error(const char* msg,
402 TRAPS) const;
403
404 void classfile_ucve_error(const char* msg,
405 const Symbol* class_name,
406 u2 major,
407 u2 minor,
408 TRAPS) const;
409
410 inline void guarantee_property(bool b, const char* msg, TRAPS) const {
411 if (!b) { classfile_parse_error(msg, THREAD); return; }
412 }
413
414 inline void guarantee_property(bool b,
415 const char* msg,
416 int index,
417 TRAPS) const {
418 if (!b) { classfile_parse_error(msg, index, THREAD); return; }
419 }
420
421 inline void guarantee_property(bool b,
422 const char* msg,
423 const char *name,
424 TRAPS) const {
425 if (!b) { classfile_parse_error(msg, name, THREAD); return; }
426 }
427
428 inline void guarantee_property(bool b,
429 const char* msg,
430 int index,
431 const char *name,
432 TRAPS) const {
433 if (!b) { classfile_parse_error(msg, index, name, THREAD); return; }
434 }
435
436 void throwIllegalSignature(const char* type,
437 const Symbol* name,
438 const Symbol* sig,
439 TRAPS) const;
440
441 void verify_constantvalue(const ConstantPool* const cp,
442 int constantvalue_index,
443 int signature_index,
444 TRAPS) const;
445
446 void verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) const;
447 void verify_legal_class_name(const Symbol* name, TRAPS) const;
448 void verify_legal_field_name(const Symbol* name, TRAPS) const;
449 void verify_legal_method_name(const Symbol* name, TRAPS) const;
450
451 bool legal_field_signature(const Symbol* signature, TRAPS) const;
452
453 void verify_legal_field_signature(const Symbol* fieldname,
454 const Symbol* signature,
455 TRAPS) const;
456 int verify_legal_method_signature(const Symbol* methodname,
457 const Symbol* signature,
458 TRAPS) const;
459 void verify_legal_name_with_signature(const Symbol* name,
460 const Symbol* signature,
461 TRAPS) const;
462
463 void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS);
464
465 void verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const;
466 void verify_legal_field_modifiers(jint flags,
467 AccessFlags class_access_flags,
468 TRAPS) const;
469 void verify_legal_method_modifiers(jint flags,
470 AccessFlags class_access_flags,
471 const Symbol* name,
472 TRAPS) const;
473
474 void check_super_class_access(const InstanceKlass* this_klass,
475 TRAPS);
476
477 void check_super_interface_access(const InstanceKlass* this_klass,
478 TRAPS);
479
480 const char* skip_over_field_signature(const char* signature,
481 bool void_ok,
482 unsigned int length,
483 TRAPS) const;
484
485 // Wrapper for constantTag.is_klass_[or_]reference.
486 // In older versions of the VM, Klass*s cannot sneak into early phases of
487 // constant pool construction, but in later versions they can.
488 // %%% Let's phase out the old is_klass_reference.
489 bool valid_klass_reference_at(int index) const {
490 return _cp->is_within_bounds(index) &&
491 _cp->tag_at(index).is_klass_or_reference();
492 }
493
494 // Checks that the cpool index is in range and is a utf8
495 bool valid_symbol_at(int cpool_index) const {
496 return _cp->is_within_bounds(cpool_index) &&
497 _cp->tag_at(cpool_index).is_utf8();
498 }
499
500 void copy_localvariable_table(const ConstMethod* cm,
501 int lvt_cnt,
502 u2* const localvariable_table_length,
503 const unsafe_u2** const localvariable_table_start,
504 int lvtt_cnt,
505 u2* const localvariable_type_table_length,
506 const unsafe_u2** const localvariable_type_table_start,
507 TRAPS);
508
509 void copy_method_annotations(ConstMethod* cm,
510 const u1* runtime_visible_annotations,
511 int runtime_visible_annotations_length,
512 const u1* runtime_visible_parameter_annotations,
513 int runtime_visible_parameter_annotations_length,
514 const u1* runtime_visible_type_annotations,
515 int runtime_visible_type_annotations_length,
516 const u1* annotation_default,
517 int annotation_default_length,
518 TRAPS);
519
520 void update_class_name(Symbol* new_name);
521
522 // Check if the class file supports inline types
523 bool supports_inline_types() const;
524
525 public:
526 ClassFileParser(ClassFileStream* stream,
527 Symbol* name,
528 ClassLoaderData* loader_data,
529 const ClassLoadInfo* cl_info,
530 Publicity pub_level,
531 TRAPS);
532
533 ~ClassFileParser();
534
535 InstanceKlass* create_instance_klass(bool cf_changed_in_CFLH, const ClassInstanceInfo& cl_inst_info, TRAPS);
536
537 const ClassFileStream* clone_stream() const;
538
539 void set_klass_to_deallocate(InstanceKlass* klass);
540
541 int static_field_size() const;
542 int total_oop_map_count() const;
543 jint layout_size() const;
544
545 int vtable_size() const { return _vtable_size; }
546 int itable_size() const { return _itable_size; }
547
548 u2 this_class_index() const { return _this_class_index; }
549
550 bool is_hidden() const { return _is_hidden; }
551 bool is_interface() const { return _access_flags.is_interface(); }
552 // Being an inline type means being a concrete value class
553 bool is_inline_type() const { return !_access_flags.is_identity_class() && !_access_flags.is_interface() && !_access_flags.is_abstract(); }
554 bool is_abstract_class() const { return _access_flags.is_abstract(); }
555 bool is_identity_class() const { return _access_flags.is_identity_class(); }
556 bool has_inline_fields() const { return _has_inline_type_fields; }
557
558 u2 java_fields_count() const { return _java_fields_count; }
559 bool is_abstract() const { return _access_flags.is_abstract(); }
560
561 // Returns true if the Klass to be generated will need to be addressable
562 // with a narrow Klass ID.
563 bool klass_needs_narrow_id() const;
564
565 ClassLoaderData* loader_data() const { return _loader_data; }
566 const Symbol* class_name() const { return _class_name; }
567 const InstanceKlass* super_klass() const { return _super_klass; }
568
569 ReferenceType super_reference_type() const;
570 bool is_instance_ref_klass() const;
571 bool is_java_lang_ref_Reference_subclass() const;
572
573 AccessFlags access_flags() const { return _access_flags; }
574
575 bool is_internal() const { return INTERNAL == _pub_level; }
576
577 bool is_class_in_loadable_descriptors_attribute(Symbol *klass);
578
579 static bool verify_unqualified_name(const char* name, unsigned int length, int type);
580
581 #ifdef ASSERT
582 static bool is_internal_format(Symbol* class_name);
583 #endif
584
585 };
586
587 #endif // SHARE_CLASSFILE_CLASSFILEPARSER_HPP