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 bool _has_nonstatic_fields;
78 };
79
80 // Parser for for .class files
81 //
82 // The bytes describing the class file structure is read from a Stream object
83
84 class ClassFileParser {
85 friend class FieldLayoutBuilder;
86 friend class FieldLayout;
87
88 class ClassAnnotationCollector;
89 class FieldAnnotationCollector;
90
91 public:
92 // The ClassFileParser has an associated "publicity" level
93 // It is used to control which subsystems (if any)
94 // will observe the parsing (logging, events, tracing).
95 // Default level is "BROADCAST", which is equivalent to
96 // a "public" parsing attempt.
97 //
98 // "INTERNAL" level should be entirely private to the
99 // caller - this allows for internal reuse of ClassFileParser
100 //
101 enum Publicity {
102 INTERNAL,
103 BROADCAST
104 };
105
106 enum { LegalClass, LegalField, LegalMethod }; // used to verify unqualified names
107
108 private:
109 // Potentially unaligned pointer to various 16-bit entries in the class file
110 typedef void unsafe_u2;
111
112 const ClassFileStream* _stream; // Actual input stream
113 Symbol* _class_name;
114 mutable ClassLoaderData* _loader_data;
115 const bool _is_hidden;
116 const bool _can_access_vm_annotations;
117 int _orig_cp_size;
118 unsigned int _static_oop_count;
119
120 // Metadata created before the instance klass is created. Must be deallocated
121 // if not transferred to the InstanceKlass upon successful class loading
122 // in which case these pointers have been set to null.
123 const InstanceKlass* _super_klass;
124 ConstantPool* _cp;
125 Array<u1>* _fieldinfo_stream;
126 Array<FieldStatus>* _fields_status;
127 Array<Method*>* _methods;
128 Array<u2>* _inner_classes;
129 Array<u2>* _nest_members;
130 u2 _nest_host;
131 Array<u2>* _permitted_subclasses;
132 Array<RecordComponent*>* _record_components;
133 Array<InstanceKlass*>* _local_interfaces;
134 Array<InstanceKlass*>* _transitive_interfaces;
135 Annotations* _combined_annotations;
136 AnnotationArray* _class_annotations;
137 AnnotationArray* _class_type_annotations;
138 Array<AnnotationArray*>* _fields_annotations;
139 Array<AnnotationArray*>* _fields_type_annotations;
140 InstanceKlass* _klass; // InstanceKlass* once created.
141 InstanceKlass* _klass_to_deallocate; // an InstanceKlass* to be destroyed
142
143 ClassAnnotationCollector* _parsed_annotations;
144 FieldLayoutInfo* _field_info;
145 GrowableArray<FieldInfo>* _temp_field_info;
146 const intArray* _method_ordering;
147 GrowableArray<Method*>* _all_mirandas;
148
149 enum { fixed_buffer_size = 128 };
150 u_char _linenumbertable_buffer[fixed_buffer_size];
151
152 // Size of Java vtable (in words)
153 int _vtable_size;
154 int _itable_size;
155
156 int _num_miranda_methods;
157
158 Handle _protection_domain;
159 AccessFlags _access_flags;
160
161 // for tracing and notifications
162 Publicity _pub_level;
163
164 // Used to keep track of whether a constant pool item 19 or 20 is found. These
165 // correspond to CONSTANT_Module and CONSTANT_Package tags and are not allowed
166 // in regular class files. For class file version >= 53, a CFE cannot be thrown
167 // immediately when these are seen because a NCDFE must be thrown if the class's
168 // access_flags have ACC_MODULE set. But, the access_flags haven't been looked
169 // at yet. So, the bad constant pool item is cached here. A value of zero
170 // means that no constant pool item 19 or 20 was found.
171 short _bad_constant_seen;
172
173 // class attributes parsed before the instance klass is created:
174 bool _synthetic_flag;
175 int _sde_length;
176 const char* _sde_buffer;
177 u2 _sourcefile_index;
178 u2 _generic_signature_index;
179
180 u2 _major_version;
181 u2 _minor_version;
182 u2 _this_class_index;
183 u2 _super_class_index;
184 u2 _itfs_len;
185 u2 _java_fields_count;
186
187 bool _need_verify;
188
189 bool _has_nonstatic_concrete_methods;
190 bool _declares_nonstatic_concrete_methods;
191 bool _has_localvariable_table;
192 bool _has_final_method;
193 bool _has_contended_fields;
194
195 // precomputed flags
196 bool _has_finalizer;
197 bool _has_empty_finalizer;
198 int _max_bootstrap_specifier_index; // detects BSS values
199
200 void parse_stream(const ClassFileStream* const stream, TRAPS);
201
202 void mangle_hidden_class_name(InstanceKlass* const ik);
203
204 void post_process_parsed_stream(const ClassFileStream* const stream,
205 ConstantPool* cp,
206 TRAPS);
207
208 void fill_instance_klass(InstanceKlass* ik, bool cf_changed_in_CFLH,
209 const ClassInstanceInfo& cl_inst_info, TRAPS);
210
211 void set_klass(InstanceKlass* instance);
212
213 void set_class_bad_constant_seen(short bad_constant);
214 short class_bad_constant_seen() { return _bad_constant_seen; }
215 void set_class_synthetic_flag(bool x) { _synthetic_flag = x; }
216 void set_class_sourcefile_index(u2 x) { _sourcefile_index = x; }
217 void set_class_generic_signature_index(u2 x) { _generic_signature_index = x; }
218 void set_class_sde_buffer(const char* x, int len) { _sde_buffer = x; _sde_length = len; }
219
220 void create_combined_annotations(TRAPS);
221 void apply_parsed_class_attributes(InstanceKlass* k); // update k
222 void apply_parsed_class_metadata(InstanceKlass* k, int fields_count);
223 void clear_class_metadata();
224
225 // Constant pool parsing
226 void parse_constant_pool_entries(const ClassFileStream* const stream,
227 ConstantPool* cp,
228 const int length,
229 TRAPS);
230
231 void parse_constant_pool(const ClassFileStream* const cfs,
232 ConstantPool* const cp,
233 const int length,
234 TRAPS);
235
236 // Interface parsing
237 void parse_interfaces(const ClassFileStream* const stream,
238 const int itfs_len,
239 ConstantPool* const cp,
240 bool* has_nonstatic_concrete_methods,
241 TRAPS);
242
243 const InstanceKlass* parse_super_class(ConstantPool* const cp,
244 const int super_class_index,
245 const bool need_verify,
246 TRAPS);
247
248 // Field parsing
249 void parse_field_attributes(const ClassFileStream* const cfs,
250 u2 attributes_count,
251 bool is_static,
252 u2 signature_index,
253 u2* const constantvalue_index_addr,
254 bool* const is_synthetic_addr,
255 u2* const generic_signature_index_addr,
256 FieldAnnotationCollector* parsed_annotations,
257 TRAPS);
258
259 void parse_fields(const ClassFileStream* const cfs,
260 bool is_interface,
261 ConstantPool* cp,
262 const int cp_size,
263 u2* const java_fields_count_ptr,
264 TRAPS);
265
266 // Method parsing
267 Method* parse_method(const ClassFileStream* const cfs,
268 bool is_interface,
269 const ConstantPool* cp,
270 bool* const has_localvariable_table,
271 TRAPS);
272
273 void parse_methods(const ClassFileStream* const cfs,
274 bool is_interface,
275 bool* const has_localvariable_table,
276 bool* const has_final_method,
277 bool* const declares_nonstatic_concrete_methods,
278 TRAPS);
279
280 const unsafe_u2* parse_exception_table(const ClassFileStream* const stream,
281 u4 code_length,
282 u4 exception_table_length,
283 TRAPS);
284
285 void parse_linenumber_table(u4 code_attribute_length,
286 u4 code_length,
287 CompressedLineNumberWriteStream**const write_stream,
288 TRAPS);
289
290 const unsafe_u2* parse_localvariable_table(const ClassFileStream* const cfs,
291 u4 code_length,
292 u2 max_locals,
293 u4 code_attribute_length,
294 u2* const localvariable_table_length,
295 bool isLVTT,
296 TRAPS);
297
298 const unsafe_u2* parse_checked_exceptions(const ClassFileStream* const cfs,
299 u2* const checked_exceptions_length,
300 u4 method_attribute_length,
301 TRAPS);
302
303 // Classfile attribute parsing
304 u2 parse_generic_signature_attribute(const ClassFileStream* const cfs, TRAPS);
305 void parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, TRAPS);
306 void parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
307 int length,
308 TRAPS);
309
310 // Check for circularity in InnerClasses attribute.
311 bool check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS);
312
313 u2 parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
314 const ConstantPool* cp,
315 const u1* const inner_classes_attribute_start,
316 bool parsed_enclosingmethod_attribute,
317 u2 enclosing_method_class_index,
318 u2 enclosing_method_method_index,
319 TRAPS);
320
321 u2 parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
322 const u1* const nest_members_attribute_start,
323 TRAPS);
324
325 u2 parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
326 const u1* const permitted_subclasses_attribute_start,
327 TRAPS);
328
329 u4 parse_classfile_record_attribute(const ClassFileStream* const cfs,
330 const ConstantPool* cp,
331 const u1* const record_attribute_start,
332 TRAPS);
333
334 void parse_classfile_attributes(const ClassFileStream* const cfs,
335 ConstantPool* cp,
336 ClassAnnotationCollector* parsed_annotations,
337 TRAPS);
338
339 void parse_classfile_synthetic_attribute();
340 void parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS);
341 void parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
342 ConstantPool* cp,
343 u4 attribute_length,
344 TRAPS);
345
346 // Annotations handling
347 AnnotationArray* allocate_annotations(const u1* const anno,
348 int anno_length,
349 TRAPS);
350
351 void set_precomputed_flags(InstanceKlass* k);
352
353 // Format checker methods
354 void classfile_parse_error(const char* msg, TRAPS) const;
355 void classfile_parse_error(const char* msg, int index, TRAPS) const;
356 void classfile_parse_error(const char* msg, const char *name, TRAPS) const;
357 void classfile_parse_error(const char* msg,
358 int index,
359 const char *name,
360 TRAPS) const;
361 void classfile_parse_error(const char* msg,
362 const char* name,
363 const char* signature,
364 TRAPS) const;
365
366 void classfile_icce_error(const char* msg,
367 const Klass* k,
368 TRAPS) const;
369
370 // Uses msg directly in the ICCE, with no additional content
371 void classfile_icce_error(const char* msg,
372 TRAPS) const;
373
374 void classfile_ucve_error(const char* msg,
375 const Symbol* class_name,
376 u2 major,
377 u2 minor,
378 TRAPS) const;
379
380 inline void guarantee_property(bool b, const char* msg, TRAPS) const {
381 if (!b) { classfile_parse_error(msg, THREAD); return; }
382 }
383
384 inline void guarantee_property(bool b,
385 const char* msg,
386 int index,
387 TRAPS) const {
388 if (!b) { classfile_parse_error(msg, index, THREAD); return; }
389 }
390
391 inline void guarantee_property(bool b,
392 const char* msg,
393 const char *name,
394 TRAPS) const {
395 if (!b) { classfile_parse_error(msg, name, THREAD); return; }
396 }
397
398 inline void guarantee_property(bool b,
399 const char* msg,
400 int index,
401 const char *name,
402 TRAPS) const {
403 if (!b) { classfile_parse_error(msg, index, name, THREAD); return; }
404 }
405
406 void throwIllegalSignature(const char* type,
407 const Symbol* name,
408 const Symbol* sig,
409 TRAPS) const;
410
411 void verify_constantvalue(const ConstantPool* const cp,
412 int constantvalue_index,
413 int signature_index,
414 TRAPS) const;
415
416 void verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) const;
417 void verify_legal_class_name(const Symbol* name, TRAPS) const;
418 void verify_legal_field_name(const Symbol* name, TRAPS) const;
419 void verify_legal_method_name(const Symbol* name, TRAPS) const;
420
421 void verify_legal_field_signature(const Symbol* fieldname,
422 const Symbol* signature,
423 TRAPS) const;
424 int verify_legal_method_signature(const Symbol* methodname,
425 const Symbol* signature,
426 TRAPS) const;
427 void verify_legal_name_with_signature(const Symbol* name,
428 const Symbol* signature,
429 TRAPS) const;
430
431 void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS);
432
433 void verify_legal_class_modifiers(jint flags, TRAPS) const;
434 void verify_legal_field_modifiers(jint flags, bool is_interface, TRAPS) const;
435 void verify_legal_method_modifiers(jint flags,
436 bool is_interface,
437 const Symbol* name,
438 TRAPS) const;
439
440 void check_super_class_access(const InstanceKlass* this_klass,
441 TRAPS);
442
443 void check_super_interface_access(const InstanceKlass* this_klass,
444 TRAPS);
445
446 const char* skip_over_field_signature(const char* signature,
447 bool void_ok,
448 unsigned int length,
449 TRAPS) const;
450
451 // Wrapper for constantTag.is_klass_[or_]reference.
452 // In older versions of the VM, Klass*s cannot sneak into early phases of
453 // constant pool construction, but in later versions they can.
454 // %%% Let's phase out the old is_klass_reference.
455 bool valid_klass_reference_at(int index) const {
456 return _cp->is_within_bounds(index) &&
457 _cp->tag_at(index).is_klass_or_reference();
458 }
459
460 // Checks that the cpool index is in range and is a utf8
461 bool valid_symbol_at(int cpool_index) const {
462 return _cp->is_within_bounds(cpool_index) &&
463 _cp->tag_at(cpool_index).is_utf8();
464 }
465
466 void copy_localvariable_table(const ConstMethod* cm,
467 int lvt_cnt,
468 u2* const localvariable_table_length,
469 const unsafe_u2** const localvariable_table_start,
470 int lvtt_cnt,
471 u2* const localvariable_type_table_length,
472 const unsafe_u2** const localvariable_type_table_start,
473 TRAPS);
474
475 void copy_method_annotations(ConstMethod* cm,
476 const u1* runtime_visible_annotations,
477 int runtime_visible_annotations_length,
478 const u1* runtime_visible_parameter_annotations,
479 int runtime_visible_parameter_annotations_length,
480 const u1* runtime_visible_type_annotations,
481 int runtime_visible_type_annotations_length,
482 const u1* annotation_default,
483 int annotation_default_length,
484 TRAPS);
485
486 void update_class_name(Symbol* new_name);
487
488 public:
489 ClassFileParser(ClassFileStream* stream,
490 Symbol* name,
491 ClassLoaderData* loader_data,
492 const ClassLoadInfo* cl_info,
493 Publicity pub_level,
494 TRAPS);
495
496 ~ClassFileParser();
497
498 InstanceKlass* create_instance_klass(bool cf_changed_in_CFLH, const ClassInstanceInfo& cl_inst_info, TRAPS);
499
500 const ClassFileStream* clone_stream() const;
501
502 void set_klass_to_deallocate(InstanceKlass* klass);
503
504 int static_field_size() const;
505 int total_oop_map_count() const;
506 jint layout_size() const;
507
508 int vtable_size() const { return _vtable_size; }
509 int itable_size() const { return _itable_size; }
510
511 u2 this_class_index() const { return _this_class_index; }
512
513 bool is_hidden() const { return _is_hidden; }
514 bool is_interface() const { return _access_flags.is_interface(); }
515 bool is_abstract() const { return _access_flags.is_abstract(); }
516
517 // Returns true if the Klass to be generated will need to be addressable
518 // with a narrow Klass ID.
519 bool klass_needs_narrow_id() const;
520
521 ClassLoaderData* loader_data() const { return _loader_data; }
522 const Symbol* class_name() const { return _class_name; }
523 const InstanceKlass* super_klass() const { return _super_klass; }
524
525 ReferenceType super_reference_type() const;
526 bool is_instance_ref_klass() const;
527 bool is_java_lang_ref_Reference_subclass() const;
528
529 AccessFlags access_flags() const { return _access_flags; }
530
531 bool is_internal() const { return INTERNAL == _pub_level; }
532
533 static bool verify_unqualified_name(const char* name, unsigned int length, int type);
534
535 #ifdef ASSERT
536 static bool is_internal_format(Symbol* class_name);
537 #endif
538
539 };
540
541 #endif // SHARE_CLASSFILE_CLASSFILEPARSER_HPP