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58eb6e7c AG |
1 | // defineclass.cc - defining a class from .class format. |
2 | ||
2ba5f774 | 3 | /* Copyright (C) 1999, 2000 Free Software Foundation |
58eb6e7c AG |
4 | |
5 | This file is part of libgcj. | |
6 | ||
7 | This software is copyrighted work licensed under the terms of the | |
8 | Libgcj License. Please consult the file "LIBGCJ_LICENSE" for | |
9 | details. */ | |
10 | ||
11 | /* | |
12 | Author: Kresten Krab Thorup <krab@gnu.org> | |
13 | ||
14 | Written using the online versions of Java Language Specification (1st | |
15 | ed.) and The Java Virtual Machine Specification (2nd ed.). | |
16 | ||
17 | Future work may include reading (and handling) attributes which are | |
18 | currently being ignored ("InnerClasses", "LineNumber", etc...). | |
19 | */ | |
20 | ||
27e934d8 TT |
21 | #include <config.h> |
22 | ||
58eb6e7c AG |
23 | #include <java-interp.h> |
24 | ||
25 | #ifdef INTERPRETER | |
26 | ||
27 | #include <java-cpool.h> | |
27e934d8 | 28 | #include <gcj/cni.h> |
58eb6e7c AG |
29 | |
30 | #include <java/lang/Class.h> | |
31 | #include <java/lang/Float.h> | |
32 | #include <java/lang/Double.h> | |
33 | #include <java/lang/Character.h> | |
34 | #include <java/lang/LinkageError.h> | |
35 | #include <java/lang/InternalError.h> | |
36 | #include <java/lang/ClassFormatError.h> | |
37 | #include <java/lang/NoClassDefFoundError.h> | |
38 | #include <java/lang/ClassCircularityError.h> | |
39 | #include <java/lang/ClassNotFoundException.h> | |
40 | #include <java/lang/IncompatibleClassChangeError.h> | |
e409a2c8 | 41 | #include <java/lang/reflect/Modifier.h> |
58eb6e7c AG |
42 | |
43 | #define ClassClass _CL_Q34java4lang5Class | |
44 | extern java::lang::Class ClassClass; | |
58eb6e7c AG |
45 | #define ClassObject _CL_Q34java4lang6Object |
46 | extern java::lang::Class ClassObject; | |
47 | ||
48 | // we don't verify method names that match these. | |
49 | static _Jv_Utf8Const *clinit_name = _Jv_makeUtf8Const ("<clinit>", 8); | |
50 | static _Jv_Utf8Const *init_name = _Jv_makeUtf8Const ("<init>", 6); | |
51 | ||
52 | ||
53 | // these go in some seperate functions, to avoid having _Jv_InitClass | |
54 | // inserted all over the place. | |
55 | static void throw_internal_error (char *msg) | |
56 | __attribute__ ((__noreturn__)); | |
57 | static void throw_no_class_def_found_error (jstring msg) | |
58 | __attribute__ ((__noreturn__)); | |
59 | static void throw_no_class_def_found_error (char *msg) | |
60 | __attribute__ ((__noreturn__)); | |
61 | static void throw_class_format_error (jstring msg) | |
62 | __attribute__ ((__noreturn__)); | |
63 | static void throw_class_format_error (char *msg) | |
64 | __attribute__ ((__noreturn__)); | |
65 | static void throw_incompatible_class_change_error (jstring msg) | |
66 | __attribute__ ((__noreturn__)); | |
67 | static void throw_class_circularity_error (jstring msg) | |
68 | __attribute__ ((__noreturn__)); | |
69 | ||
70 | static jdouble long_bits_to_double (jlong); | |
71 | static jfloat int_bits_to_float (jint); | |
72 | ||
73 | /** | |
74 | * We define class reading using a class. It is practical, since then | |
75 | * the entire class-reader can be a friend of class Class (it needs to | |
76 | * write all it's different structures); but also because this makes it | |
77 | * easy to make class definition reentrant, and thus two threads can be | |
78 | * defining classes at the same time. This class (_Jv_ClassReader) is | |
79 | * never exposed outside this file, so we don't have to worry about | |
80 | * public or private members here. | |
81 | */ | |
82 | ||
83 | struct _Jv_ClassReader { | |
84 | ||
85 | // do verification? Currently, there is no option to disable this. | |
86 | // This flag just controls the verificaiton done by the class loader; | |
87 | // i.e., checking the integrity of the constant pool; and it is | |
88 | // allways on. You always want this as far as I can see, but it also | |
89 | // controls weither identifiers and type descriptors/signatures are | |
90 | // verified as legal. This could be somewhat more expensive since it | |
91 | // will call Characher.isJavaIdentifier{Start,Part} for each character | |
92 | // in any identifier (field name or method name) it comes by. Thus, | |
93 | // it might be useful to turn off this verification for classes that | |
94 | // come from a trusted source. However, for GCJ, trusted classes are | |
95 | // most likely to be linked in. | |
96 | ||
97 | bool verify; | |
98 | ||
99 | // input data. | |
100 | unsigned char *bytes; | |
101 | int len; | |
102 | ||
103 | // current input position | |
104 | int pos; | |
105 | ||
106 | // the constant pool data | |
107 | int pool_count; | |
108 | unsigned char *tags; | |
109 | unsigned int *offsets; | |
110 | ||
111 | // the class to define (see java-interp.h) | |
112 | _Jv_InterpClass *def; | |
113 | ||
114 | /* check that the given number of input bytes are available */ | |
115 | inline void check (int num) | |
116 | { | |
117 | if (pos + num > len) | |
118 | throw_class_format_error ("Premature end of data"); | |
119 | } | |
120 | ||
121 | /* skip a given number of bytes in input */ | |
122 | inline void skip (int num) | |
123 | { | |
124 | check (num); | |
125 | pos += num; | |
126 | } | |
127 | ||
128 | /* read an unsignend 1-byte unit */ | |
129 | inline static jint get1u (unsigned char* bytes) | |
130 | { | |
131 | return bytes[0]; | |
132 | } | |
133 | ||
134 | /* read an unsigned 1-byte unit */ | |
135 | inline jint read1u () | |
136 | { | |
137 | skip (1); | |
138 | return get1u (bytes+pos-1); | |
139 | } | |
140 | ||
141 | /* read an unsigned 2-byte unit */ | |
142 | inline static jint get2u (unsigned char *bytes) | |
143 | { | |
144 | return (((jint)bytes[0]) << 8) | ((jint)bytes[1]); | |
145 | } | |
146 | ||
147 | /* read an unsigned 2-byte unit */ | |
148 | inline jint read2u () | |
149 | { | |
150 | skip (2); | |
151 | return get2u (bytes+pos-2); | |
152 | } | |
153 | ||
154 | /* read a 4-byte unit */ | |
155 | static jint get4 (unsigned char *bytes) | |
156 | { | |
157 | return (((jint)bytes[0]) << 24) | |
158 | | (((jint)bytes[1]) << 16) | |
159 | | (((jint)bytes[2]) << 8) | |
160 | | (((jint)bytes[3]) << 0); | |
161 | } | |
162 | ||
163 | /* read a 4-byte unit, (we don't do that quite so often) */ | |
164 | inline jint read4 () | |
165 | { | |
166 | skip (4); | |
167 | return get4 (bytes+pos-4); | |
168 | } | |
169 | ||
170 | /* read a 8-byte unit */ | |
171 | static jlong get8 (unsigned char* bytes) | |
172 | { | |
173 | return (((jlong)bytes[0]) << 56) | |
174 | | (((jlong)bytes[1]) << 48) | |
175 | | (((jlong)bytes[2]) << 40) | |
176 | | (((jlong)bytes[3]) << 32) | |
177 | | (((jlong)bytes[4]) << 24) | |
178 | | (((jlong)bytes[5]) << 16) | |
179 | | (((jlong)bytes[6]) << 8) | |
180 | | (((jlong)bytes[7]) << 0); | |
181 | } | |
182 | ||
183 | /* read a 8-byte unit */ | |
184 | inline jlong read8 () | |
185 | { | |
186 | skip (8); | |
187 | return get8 (bytes+pos-8); | |
188 | } | |
189 | ||
190 | inline void check_tag (int index, char expected_tag) | |
191 | { | |
192 | if (index < 0 | |
193 | || index > pool_count | |
194 | || tags[index] != expected_tag) | |
195 | throw_class_format_error ("erroneous constant pool tag"); | |
196 | } | |
197 | ||
198 | _Jv_ClassReader (jclass klass, jbyteArray data, jint offset, jint length) | |
199 | { | |
200 | if (klass == 0 || length < 0 || offset+length > data->length) | |
201 | throw_internal_error ("arguments to _Jv_DefineClass"); | |
202 | ||
203 | verify = true; | |
204 | bytes = (unsigned char*) (elements (data)+offset); | |
205 | len = length; | |
206 | pos = 0; | |
207 | def = (_Jv_InterpClass*) klass; | |
208 | } | |
209 | ||
210 | /** and here goes the parser members defined out-of-line */ | |
211 | void parse (); | |
212 | void read_constpool (); | |
213 | void prepare_pool_entry (int index, unsigned char tag); | |
214 | void read_fields (); | |
215 | void read_methods (); | |
216 | void read_one_class_attribute (); | |
217 | void read_one_method_attribute (int method); | |
218 | void read_one_code_attribute (int method); | |
219 | void read_one_field_attribute (int field); | |
220 | ||
221 | /** check an utf8 entry, without creating a Utf8Const object */ | |
222 | bool is_attribute_name (int index, char *name); | |
223 | ||
224 | /** here goes the class-loader members defined out-of-line */ | |
225 | void handleConstantPool (); | |
226 | void handleClassBegin (int, int, int); | |
227 | void handleInterfacesBegin (int); | |
228 | void handleInterface (int, int); | |
229 | void handleFieldsBegin (int); | |
230 | void handleField (int, int, int, int); | |
231 | void handleFieldsEnd (); | |
232 | void handleConstantValueAttribute (int,int); | |
233 | void handleMethodsBegin (int); | |
234 | void handleMethod (int, int, int, int); | |
235 | void handleMethodsEnd (); | |
236 | void handleCodeAttribute (int, int, int, int, int, int); | |
237 | void handleExceptionTableEntry (int, int, int, int, int, int); | |
238 | ||
239 | void checkExtends (jclass sub, jclass super); | |
240 | void checkImplements (jclass sub, jclass super); | |
241 | ||
242 | /* | |
243 | * FIXME: we should keep a hash table of utf8-strings, since many will | |
244 | * be the same. It's a little tricky, however, because the hash table | |
245 | * needs to interact gracefully with the garbage collector. Much | |
246 | * memory is to be saved by this, however! perhaps the improvement | |
247 | * could be implemented in prims.cc (_Jv_makeUtf8Const), since it | |
248 | * computes the hash value anyway. | |
249 | */ | |
58eb6e7c AG |
250 | }; |
251 | ||
252 | /* This is used for the isJavaIdentifierStart & isJavaIdentifierPart | |
253 | methods, so we avoid doing _Jv_InitClass all the time */ | |
254 | ||
255 | static const java::lang::Character *character = 0; | |
256 | static void prepare_character (); | |
257 | ||
258 | void | |
259 | _Jv_DefineClass (jclass klass, jbyteArray data, jint offset, jint length) | |
260 | { | |
261 | if (character == 0) | |
262 | prepare_character (); | |
263 | ||
264 | _Jv_ClassReader reader (klass, data, offset, length); | |
265 | reader.parse(); | |
266 | ||
267 | /* that's it! */ | |
268 | } | |
269 | ||
270 | /** put it after _Jv_DefineClass, so it doesn't get inlined */ | |
271 | static void prepare_character () | |
272 | { | |
273 | character = new java::lang::Character ('!'); | |
274 | } | |
275 | ||
276 | \f | |
277 | /** This section defines the parsing/scanning of the class data */ | |
278 | ||
279 | void | |
280 | _Jv_ClassReader::parse () | |
281 | { | |
282 | int magic = read4 (); | |
283 | ||
284 | /* FIXME: Decide which range of version numbers to allow */ | |
285 | ||
286 | /* int minor_version = */ read2u (); | |
287 | /* int major_verson = */ read2u (); | |
288 | ||
289 | if (magic != (int) 0xCAFEBABE) | |
290 | throw_class_format_error ("bad magic number"); | |
291 | ||
292 | pool_count = read2u (); | |
293 | ||
294 | read_constpool (); | |
295 | ||
296 | int access_flags = read2u (); | |
297 | int this_class = read2u (); | |
298 | int super_class = read2u (); | |
299 | ||
300 | check_tag (this_class, JV_CONSTANT_Class); | |
301 | if (super_class != 0) | |
302 | check_tag (super_class, JV_CONSTANT_Class); | |
303 | ||
304 | handleClassBegin (access_flags, this_class, super_class); | |
305 | ||
306 | int interfaces_count = read2u (); | |
307 | ||
308 | handleInterfacesBegin (interfaces_count); | |
309 | ||
310 | for (int i = 0; i < interfaces_count; i++) | |
311 | { | |
312 | int iface = read2u (); | |
313 | check_tag (iface, JV_CONSTANT_Class); | |
314 | handleInterface (i, iface); | |
315 | } | |
316 | ||
317 | read_fields (); | |
318 | read_methods (); | |
319 | ||
320 | int attributes_count = read2u (); | |
321 | ||
322 | for (int i = 0; i < attributes_count; i++) | |
323 | { | |
324 | read_one_class_attribute (); | |
325 | } | |
326 | ||
327 | if (pos != len) | |
328 | throw_class_format_error ("unused data before end of file"); | |
329 | ||
330 | // tell everyone we're done. | |
331 | def->state = JV_STATE_LOADED; | |
332 | def->notifyAll (); | |
333 | ||
334 | } | |
335 | ||
336 | void _Jv_ClassReader::read_constpool () | |
337 | { | |
338 | tags = (unsigned char*) _Jv_AllocBytesChecked (pool_count); | |
339 | offsets = (unsigned int *) _Jv_AllocBytesChecked (sizeof (int) | |
340 | * pool_count) ; | |
341 | ||
342 | /** first, we scan the constant pool, collecting tags and offsets */ | |
343 | tags[0] = JV_CONSTANT_Undefined; | |
344 | offsets[0] = pos; | |
345 | for (int c = 1; c < pool_count; c++) | |
346 | { | |
347 | tags[c] = read1u (); | |
348 | offsets[c] = pos; | |
349 | ||
350 | switch (tags[c]) | |
351 | { | |
352 | case JV_CONSTANT_String: | |
353 | case JV_CONSTANT_Class: | |
354 | skip (2); | |
355 | break; | |
356 | ||
357 | case JV_CONSTANT_Fieldref: | |
358 | case JV_CONSTANT_Methodref: | |
359 | case JV_CONSTANT_InterfaceMethodref: | |
360 | case JV_CONSTANT_NameAndType: | |
361 | case JV_CONSTANT_Integer: | |
362 | case JV_CONSTANT_Float: | |
363 | skip (4); | |
364 | break; | |
365 | ||
366 | case JV_CONSTANT_Double: | |
367 | case JV_CONSTANT_Long: | |
368 | skip (8); | |
369 | tags[++c] = JV_CONSTANT_Undefined; | |
370 | break; | |
371 | ||
372 | case JV_CONSTANT_Utf8: | |
373 | { | |
374 | int len = read2u (); | |
375 | skip (len); | |
376 | } | |
377 | break; | |
378 | ||
379 | case JV_CONSTANT_Unicode: | |
380 | throw_class_format_error ("unicode not supported"); | |
381 | break; | |
382 | ||
383 | default: | |
384 | throw_class_format_error ("erroneous constant pool tag"); | |
385 | } | |
386 | } | |
387 | ||
388 | handleConstantPool (); | |
389 | } | |
390 | ||
391 | ||
392 | void _Jv_ClassReader::read_fields () | |
393 | { | |
394 | int fields_count = read2u (); | |
395 | handleFieldsBegin (fields_count); | |
396 | ||
397 | for (int i = 0; i < fields_count; i++) | |
398 | { | |
399 | int access_flags = read2u (); | |
400 | int name_index = read2u (); | |
401 | int descriptor_index = read2u (); | |
402 | int attributes_count = read2u (); | |
403 | ||
404 | check_tag (name_index, JV_CONSTANT_Utf8); | |
405 | prepare_pool_entry (name_index, JV_CONSTANT_Utf8); | |
406 | ||
407 | check_tag (descriptor_index, JV_CONSTANT_Utf8); | |
408 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
409 | ||
410 | handleField (i, access_flags, name_index, descriptor_index); | |
411 | ||
412 | for (int j = 0; j < attributes_count; j++) | |
413 | { | |
414 | read_one_field_attribute (i); | |
415 | } | |
416 | } | |
417 | ||
418 | handleFieldsEnd (); | |
419 | } | |
420 | ||
421 | bool | |
422 | _Jv_ClassReader::is_attribute_name (int index, char *name) | |
423 | { | |
424 | check_tag (index, JV_CONSTANT_Utf8); | |
425 | int len = get2u (bytes+offsets[index]); | |
426 | if (len != (int) strlen (name)) | |
427 | return false; | |
428 | else | |
429 | return !memcmp (bytes+offsets[index]+2, name, len); | |
430 | } | |
431 | ||
432 | void _Jv_ClassReader::read_one_field_attribute (int field_index) | |
433 | { | |
434 | int name = read2u (); | |
435 | int length = read4 (); | |
436 | ||
437 | if (is_attribute_name (name, "ConstantValue")) | |
438 | { | |
439 | int cv = read2u (); | |
440 | ||
441 | if (cv < pool_count | |
442 | && cv > 0 | |
443 | && (tags[cv] == JV_CONSTANT_Integer | |
444 | || tags[cv] == JV_CONSTANT_Float | |
445 | || tags[cv] == JV_CONSTANT_Long | |
446 | || tags[cv] == JV_CONSTANT_Double | |
447 | || tags[cv] == JV_CONSTANT_String)) | |
448 | { | |
449 | handleConstantValueAttribute (field_index, cv); | |
450 | } | |
451 | else | |
452 | { | |
453 | throw_class_format_error ("erroneous ConstantValue attribute"); | |
454 | } | |
455 | ||
456 | if (length != 2) | |
457 | throw_class_format_error ("erroneous ConstantValue attribute"); | |
458 | } | |
459 | ||
460 | else | |
461 | { | |
462 | skip (length); | |
463 | } | |
464 | } | |
465 | ||
466 | void _Jv_ClassReader::read_methods () | |
467 | { | |
468 | int methods_count = read2u (); | |
469 | ||
470 | handleMethodsBegin (methods_count); | |
471 | ||
472 | for (int i = 0; i < methods_count; i++) | |
473 | { | |
474 | int access_flags = read2u (); | |
475 | int name_index = read2u (); | |
476 | int descriptor_index = read2u (); | |
477 | int attributes_count = read2u (); | |
478 | ||
479 | check_tag (name_index, JV_CONSTANT_Utf8); | |
480 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
481 | ||
482 | check_tag (name_index, JV_CONSTANT_Utf8); | |
483 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
484 | ||
485 | handleMethod (i, access_flags, name_index, | |
486 | descriptor_index); | |
487 | ||
488 | for (int j = 0; j < attributes_count; j++) | |
489 | { | |
490 | read_one_method_attribute (i); | |
491 | } | |
492 | } | |
493 | ||
494 | handleMethodsEnd (); | |
495 | } | |
496 | ||
497 | void _Jv_ClassReader::read_one_method_attribute (int method_index) | |
498 | { | |
499 | int name = read2u (); | |
500 | int length = read4 (); | |
501 | ||
502 | if (is_attribute_name (name, "Exceptions")) | |
503 | { | |
504 | /* we ignore this for now */ | |
505 | skip (length); | |
506 | } | |
507 | ||
508 | else if (is_attribute_name (name, "Code")) | |
509 | { | |
510 | int start_off = pos; | |
511 | int max_stack = read2u (); | |
512 | int max_locals = read2u (); | |
513 | int code_length = read4 (); | |
514 | ||
515 | int code_start = pos; | |
516 | skip (code_length); | |
517 | int exception_table_length = read2u (); | |
518 | ||
519 | handleCodeAttribute (method_index, | |
520 | max_stack, max_locals, | |
521 | code_start, code_length, | |
522 | exception_table_length); | |
523 | ||
524 | ||
525 | for (int i = 0; i < exception_table_length; i++) | |
526 | { | |
527 | int start_pc = read2u (); | |
528 | int end_pc = read2u (); | |
529 | int handler_pc = read2u (); | |
530 | int catch_type = read2u (); | |
531 | ||
532 | if (start_pc > end_pc | |
533 | || start_pc < 0 | |
534 | || end_pc >= code_length | |
535 | || handler_pc >= code_length) | |
536 | throw_class_format_error ("erroneous exception handler info"); | |
537 | ||
538 | if (! (tags[catch_type] == JV_CONSTANT_Class | |
539 | || tags[catch_type] == 0)) | |
540 | { | |
541 | throw_class_format_error ("erroneous exception handler info"); | |
542 | } | |
543 | ||
544 | handleExceptionTableEntry (method_index, | |
545 | i, | |
546 | start_pc, | |
547 | end_pc, | |
548 | handler_pc, | |
549 | catch_type); | |
550 | ||
551 | } | |
552 | ||
553 | int attributes_count = read2u (); | |
554 | ||
555 | for (int i = 0; i < attributes_count; i++) | |
556 | { | |
557 | read_one_code_attribute (method_index); | |
558 | } | |
559 | ||
560 | if ((pos - start_off) != length) | |
561 | throw_class_format_error ("code attribute too short"); | |
562 | } | |
563 | ||
564 | else | |
565 | { | |
566 | /* ignore unknown attributes */ | |
567 | skip (length); | |
568 | } | |
569 | } | |
570 | ||
571 | void _Jv_ClassReader::read_one_code_attribute (int /*method*/) | |
572 | { | |
573 | /* ignore for now, ... later we may want to pick up | |
574 | line number information, for debugging purposes; | |
575 | in fact, the whole debugger issue is open! */ | |
576 | ||
577 | /* int name = */ read2u (); | |
578 | int length = read4 (); | |
579 | skip (length); | |
580 | ||
581 | } | |
582 | ||
583 | void _Jv_ClassReader::read_one_class_attribute () | |
584 | { | |
585 | /* we also ignore the class attributes, ... | |
586 | some day we'll add inner-classes support. */ | |
587 | ||
588 | /* int name = */ read2u (); | |
589 | int length = read4 (); | |
590 | skip (length); | |
591 | } | |
592 | ||
593 | ||
594 | ||
595 | \f | |
596 | /* this section defines the semantic actions of the parser */ | |
597 | ||
598 | void _Jv_ClassReader::handleConstantPool () | |
599 | { | |
600 | /** now, we actually define the class' constant pool */ | |
601 | ||
602 | // the pool is scanned explicitly by the collector | |
603 | jbyte *pool_tags = (jbyte*) _Jv_AllocBytesChecked (pool_count); | |
7941ceab AG |
604 | _Jv_word *pool_data |
605 | = (_Jv_word*) _Jv_AllocBytesChecked (pool_count * sizeof (_Jv_word)); | |
58eb6e7c AG |
606 | |
607 | def->constants.tags = pool_tags; | |
608 | def->constants.data = pool_data; | |
609 | def->constants.size = pool_count; | |
610 | ||
611 | // Here we make a pass to collect the strings! We do this, because | |
612 | // internally in the GCJ runtime, classes are encoded with .'s not /'s. | |
613 | // Therefore, we first collect the strings, and then translate the rest | |
614 | // of the utf8-entries (thus not representing strings) from /-notation | |
615 | // to .-notation. | |
616 | for (int i = 1; i < pool_count; i++) | |
617 | { | |
618 | if (tags[i] == JV_CONSTANT_String) | |
619 | { | |
620 | unsigned char* str_data = bytes + offsets [i]; | |
621 | int utf_index = get2u (str_data); | |
622 | check_tag (utf_index, JV_CONSTANT_Utf8); | |
623 | unsigned char *utf_data = bytes + offsets[utf_index]; | |
624 | int len = get2u (utf_data); | |
7941ceab | 625 | pool_data[i].utf8 = _Jv_makeUtf8Const ((char*)(utf_data+2), len); |
58eb6e7c AG |
626 | pool_tags[i] = JV_CONSTANT_String; |
627 | } | |
628 | else | |
629 | { | |
630 | pool_tags[i] = JV_CONSTANT_Undefined; | |
631 | } | |
632 | } | |
633 | ||
634 | // and now, we scan everything else but strings & utf8-entries. This | |
635 | // leaves out those utf8-entries which are not used; which will be left | |
636 | // with a tag of JV_CONSTANT_Undefined in the class definition. | |
637 | for (int index = 1; index < pool_count; index++) | |
638 | { | |
639 | switch (tags[index]) | |
640 | { | |
641 | case JV_CONSTANT_Undefined: | |
642 | case JV_CONSTANT_String: | |
643 | case JV_CONSTANT_Utf8: | |
644 | continue; | |
645 | ||
646 | default: | |
647 | prepare_pool_entry (index, tags[index]); | |
648 | } | |
649 | } | |
650 | ||
651 | } | |
652 | ||
653 | /* this is a recursive procedure, which will prepare pool entries as needed. | |
654 | Which is how we avoid initializing those entries which go unused. */ | |
655 | void | |
656 | _Jv_ClassReader::prepare_pool_entry (int index, unsigned char this_tag) | |
657 | { | |
658 | /* these two, pool_data and pool_tags, point into the class | |
659 | structure we are currently defining */ | |
660 | ||
661 | unsigned char *pool_tags = (unsigned char*) def->constants.tags; | |
7941ceab | 662 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
663 | |
664 | /* this entry was already prepared */ | |
665 | if (pool_tags[index] == this_tag) | |
666 | return; | |
667 | ||
668 | /* this_data points to the constant-pool information for the current | |
669 | constant-pool entry */ | |
670 | ||
671 | unsigned char *this_data = bytes + offsets[index]; | |
672 | ||
673 | switch (this_tag) | |
674 | { | |
675 | case JV_CONSTANT_Utf8: | |
676 | { | |
677 | // If we came here, it is because some other tag needs this | |
678 | // utf8-entry for type information! Thus, we translate /'s to .'s in | |
679 | // order to accomondate gcj's internal representation. | |
680 | ||
681 | int len = get2u (this_data); | |
682 | char *buffer = (char*) alloca (len); | |
683 | char *s = ((char*) this_data)+2; | |
684 | ||
685 | /* FIXME: avoid using a buffer here */ | |
686 | for (int i = 0; i < len; i++) | |
687 | { | |
688 | if (s[i] == '/') | |
689 | buffer[i] = '.'; | |
690 | else | |
691 | buffer[i] = (char) s[i]; | |
692 | } | |
693 | ||
7941ceab | 694 | pool_data[index].utf8 = _Jv_makeUtf8Const (buffer, len); |
58eb6e7c AG |
695 | pool_tags[index] = JV_CONSTANT_Utf8; |
696 | } | |
697 | break; | |
698 | ||
699 | case JV_CONSTANT_Class: | |
700 | { | |
701 | int utf_index = get2u (this_data); | |
702 | check_tag (utf_index, JV_CONSTANT_Utf8); | |
703 | prepare_pool_entry (utf_index, JV_CONSTANT_Utf8); | |
704 | ||
705 | if (verify) | |
7941ceab | 706 | _Jv_VerifyClassName (pool_data[utf_index].utf8); |
58eb6e7c | 707 | |
7941ceab | 708 | pool_data[index].utf8 = pool_data[utf_index].utf8; |
58eb6e7c AG |
709 | pool_tags[index] = JV_CONSTANT_Class; |
710 | } | |
711 | break; | |
712 | ||
713 | case JV_CONSTANT_String: | |
714 | // already handled before... | |
715 | break; | |
716 | ||
717 | case JV_CONSTANT_Fieldref: | |
718 | case JV_CONSTANT_Methodref: | |
719 | case JV_CONSTANT_InterfaceMethodref: | |
720 | { | |
721 | int class_index = get2u (this_data); | |
722 | int nat_index = get2u (this_data+2); | |
723 | ||
724 | check_tag (class_index, JV_CONSTANT_Class); | |
725 | prepare_pool_entry (class_index, JV_CONSTANT_Class); | |
726 | ||
727 | check_tag (nat_index, JV_CONSTANT_NameAndType); | |
728 | prepare_pool_entry (nat_index, JV_CONSTANT_NameAndType); | |
729 | ||
730 | // here, verify the signature and identifier name | |
731 | if (verify) | |
732 | { | |
733 | _Jv_ushort name_index, type_index; | |
7941ceab | 734 | _Jv_loadIndexes (&pool_data[nat_index], |
58eb6e7c AG |
735 | name_index, type_index); |
736 | ||
737 | if (this_tag == JV_CONSTANT_Fieldref) | |
7941ceab | 738 | _Jv_VerifyFieldSignature (pool_data[type_index].utf8); |
58eb6e7c | 739 | else |
7941ceab | 740 | _Jv_VerifyMethodSignature (pool_data[type_index].utf8); |
58eb6e7c | 741 | |
7941ceab | 742 | _Jv_Utf8Const* name = pool_data[name_index].utf8; |
58eb6e7c AG |
743 | |
744 | if (this_tag != JV_CONSTANT_Fieldref | |
745 | && ( _Jv_equalUtf8Consts (name, clinit_name) | |
746 | || _Jv_equalUtf8Consts (name, init_name))) | |
747 | /* ignore */; | |
748 | else | |
7941ceab | 749 | _Jv_VerifyIdentifier (pool_data[name_index].utf8); |
58eb6e7c AG |
750 | } |
751 | ||
752 | _Jv_storeIndexes (&pool_data[index], class_index, nat_index); | |
753 | pool_tags[index] = this_tag; | |
754 | } | |
755 | break; | |
756 | ||
757 | case JV_CONSTANT_NameAndType: | |
758 | { | |
759 | _Jv_ushort name_index = get2u (this_data); | |
760 | _Jv_ushort type_index = get2u (this_data+2); | |
761 | ||
762 | check_tag (name_index, JV_CONSTANT_Utf8); | |
763 | prepare_pool_entry (name_index, JV_CONSTANT_Utf8); | |
764 | ||
765 | check_tag (type_index, JV_CONSTANT_Utf8); | |
766 | prepare_pool_entry (type_index, JV_CONSTANT_Utf8); | |
767 | ||
768 | _Jv_storeIndexes (&pool_data[index], name_index, type_index); | |
769 | pool_tags[index] = JV_CONSTANT_NameAndType; | |
770 | } | |
771 | break; | |
772 | ||
773 | case JV_CONSTANT_Float: | |
774 | { | |
775 | jfloat f = int_bits_to_float ((jint) get4 (this_data)); | |
776 | _Jv_storeFloat (&pool_data[index], f); | |
777 | pool_tags[index] = JV_CONSTANT_Float; | |
778 | } | |
779 | break; | |
780 | ||
781 | case JV_CONSTANT_Integer: | |
782 | { | |
783 | int i = get4 (this_data); | |
784 | _Jv_storeInt (&pool_data[index], i); | |
785 | pool_tags[index] = JV_CONSTANT_Integer; | |
786 | } | |
787 | break; | |
788 | ||
789 | case JV_CONSTANT_Double: | |
790 | { | |
791 | jdouble d = long_bits_to_double ((jlong) get8 (this_data)); | |
792 | _Jv_storeDouble (&pool_data[index], d); | |
793 | pool_tags[index] = JV_CONSTANT_Double; | |
794 | } | |
795 | break; | |
796 | ||
797 | case JV_CONSTANT_Long: | |
798 | { | |
799 | jlong i = get8 (this_data); | |
800 | _Jv_storeLong (&pool_data[index], i); | |
801 | pool_tags[index] = JV_CONSTANT_Long; | |
802 | } | |
803 | break; | |
804 | ||
805 | default: | |
806 | throw_class_format_error ("erroneous constant pool tag"); | |
807 | } | |
808 | } | |
809 | ||
810 | ||
811 | void | |
812 | _Jv_ClassReader::handleClassBegin | |
813 | (int access_flags, int this_class, int super_class) | |
814 | { | |
e409a2c8 TT |
815 | using namespace java::lang::reflect; |
816 | ||
58eb6e7c | 817 | unsigned char *pool_tags = (unsigned char*) def->constants.tags; |
7941ceab | 818 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
819 | |
820 | check_tag (this_class, JV_CONSTANT_Class); | |
7941ceab | 821 | _Jv_Utf8Const *loadedName = pool_data[this_class].utf8; |
58eb6e7c AG |
822 | |
823 | // was ClassLoader.defineClass called with an expected class name? | |
824 | if (def->name == 0) | |
825 | { | |
826 | jclass orig = _Jv_FindClassInCache (loadedName, def->loader); | |
827 | ||
828 | if (orig == 0) | |
829 | { | |
830 | def->name = loadedName; | |
831 | } | |
832 | else | |
833 | { | |
834 | jstring msg = JvNewStringUTF ("anonymous " | |
835 | "class data denotes " | |
836 | "existing class "); | |
837 | msg = msg->concat (orig->getName ()); | |
838 | ||
839 | throw_no_class_def_found_error (msg); | |
840 | } | |
841 | } | |
842 | ||
843 | // assert that the loaded class has the expected name, 5.3.5 | |
844 | else if (! _Jv_equalUtf8Consts (loadedName, def->name)) | |
845 | { | |
846 | jstring msg = JvNewStringUTF ("loaded class "); | |
847 | msg = msg->concat (def->getName ()); | |
848 | msg = msg->concat (_Jv_NewStringUTF (" was in fact named ")); | |
849 | jstring klass_name = _Jv_NewStringUTF (loadedName->data); | |
850 | msg = msg->concat (klass_name); | |
851 | ||
852 | throw_no_class_def_found_error (msg); | |
853 | } | |
854 | ||
855 | def->accflags = access_flags; | |
7941ceab | 856 | pool_data[this_class].clazz = def; |
58eb6e7c AG |
857 | pool_tags[this_class] = JV_CONSTANT_ResolvedClass; |
858 | ||
859 | if (super_class == 0) | |
860 | { | |
861 | // interfaces have java.lang.Object as super. | |
e409a2c8 | 862 | if (access_flags & Modifier::INTERFACE) |
58eb6e7c AG |
863 | { |
864 | def->superclass = (jclass)&ClassObject; | |
865 | } | |
866 | ||
867 | // FIXME: Consider this carefully! | |
868 | else if (!_Jv_equalUtf8Consts (def->name, ClassObject.name)) | |
869 | { | |
870 | throw_no_class_def_found_error ("loading java.lang.Object"); | |
871 | } | |
872 | } | |
873 | ||
874 | // In the pre-loading state, it can be looked up in the | |
875 | // cache only by this thread! This allows the super-class | |
876 | // to include references to this class. | |
877 | ||
878 | def->state = JV_STATE_PRELOADING; | |
879 | _Jv_RegisterClass (def); | |
880 | ||
881 | if (super_class != 0) | |
882 | { | |
883 | // load the super class | |
884 | check_tag (super_class, JV_CONSTANT_Class); | |
7941ceab | 885 | _Jv_Utf8Const* super_name = pool_data[super_class].utf8; |
58eb6e7c AG |
886 | |
887 | // load the super class using our defining loader | |
888 | jclass the_super = _Jv_FindClass (super_name, | |
889 | def->loader); | |
890 | ||
891 | // This will establish that we are allowed to be a subclass, | |
892 | // and check for class circularity error | |
893 | checkExtends (def, the_super); | |
894 | ||
895 | def->superclass = the_super; | |
7941ceab | 896 | pool_data[super_class].clazz = the_super; |
58eb6e7c AG |
897 | pool_tags[super_class] = JV_CONSTANT_ResolvedClass; |
898 | } | |
899 | ||
900 | // now we've come past the circularity problem, we can | |
901 | // now say that we're loading... | |
902 | ||
903 | def->state = JV_STATE_LOADING; | |
904 | def->notifyAll (); | |
905 | } | |
906 | ||
907 | ///// implements the checks described in sect. 5.3.5.3 | |
908 | void | |
909 | _Jv_ClassReader::checkExtends (jclass sub, jclass super) | |
910 | { | |
e409a2c8 TT |
911 | using namespace java::lang::reflect; |
912 | ||
58eb6e7c | 913 | // having an interface or a final class as a superclass is no good |
e409a2c8 | 914 | if ((super->accflags & (Modifier::INTERFACE | Modifier::FINAL)) != 0) |
58eb6e7c AG |
915 | { |
916 | throw_incompatible_class_change_error (sub->getName ()); | |
917 | } | |
918 | ||
919 | // if the super class is not public, we need to check some more | |
e409a2c8 | 920 | if ((super->accflags & Modifier::PUBLIC) == 0) |
58eb6e7c AG |
921 | { |
922 | // With package scope, the classes must have the same | |
923 | // class loader. | |
924 | if ( sub->loader != super->loader | |
925 | || !_Jv_ClassNameSamePackage (sub->name, super->name)) | |
926 | { | |
927 | throw_incompatible_class_change_error (sub->getName ()); | |
928 | } | |
929 | } | |
930 | ||
931 | for (; super != 0; super = super->superclass) | |
932 | { | |
933 | if (super == sub) | |
934 | throw_class_circularity_error (sub->getName ()); | |
935 | } | |
936 | } | |
937 | ||
938 | ||
939 | ||
940 | void _Jv_ClassReader::handleInterfacesBegin (int count) | |
941 | { | |
942 | def->interfaces = (jclass*) _Jv_AllocBytesChecked (count*sizeof (jclass)); | |
943 | def->interface_count = count; | |
944 | } | |
945 | ||
946 | void _Jv_ClassReader::handleInterface (int if_number, int offset) | |
947 | { | |
7941ceab | 948 | _Jv_word * pool_data = def->constants.data; |
58eb6e7c AG |
949 | unsigned char * pool_tags = (unsigned char*) def->constants.tags; |
950 | ||
951 | jclass the_interface; | |
952 | ||
953 | if (pool_tags[offset] == JV_CONSTANT_Class) | |
954 | { | |
7941ceab | 955 | _Jv_Utf8Const* name = pool_data[offset].utf8; |
58eb6e7c AG |
956 | the_interface = _Jv_FindClass (name, def->loader); |
957 | } | |
958 | else if (pool_tags[offset] == JV_CONSTANT_ResolvedClass) | |
959 | { | |
7941ceab | 960 | the_interface = pool_data[offset].clazz; |
58eb6e7c AG |
961 | } |
962 | else | |
963 | { | |
964 | throw_no_class_def_found_error ("erroneous constant pool tag"); | |
965 | } | |
966 | ||
967 | // checks the validity of the_interface, and that we are in fact | |
968 | // allowed to implement that interface. | |
969 | checkImplements (def, the_interface); | |
970 | ||
7941ceab | 971 | pool_data[offset].clazz = the_interface; |
58eb6e7c AG |
972 | pool_tags[offset] = JV_CONSTANT_ResolvedClass; |
973 | ||
974 | def->interfaces[if_number] = the_interface; | |
975 | } | |
976 | ||
977 | void | |
978 | _Jv_ClassReader::checkImplements (jclass sub, jclass super) | |
979 | { | |
e409a2c8 TT |
980 | using namespace java::lang::reflect; |
981 | ||
58eb6e7c | 982 | // well, it *must* be an interface |
e409a2c8 | 983 | if ((super->accflags & Modifier::INTERFACE) == 0) |
58eb6e7c AG |
984 | { |
985 | throw_incompatible_class_change_error (sub->getName ()); | |
986 | } | |
987 | ||
988 | // if it has package scope, it must also be defined by the | |
989 | // same loader. | |
e409a2c8 | 990 | if ((super->accflags & Modifier::PUBLIC) == 0) |
58eb6e7c AG |
991 | { |
992 | if ( sub->loader != super->loader | |
993 | || !_Jv_ClassNameSamePackage (sub->name, super->name)) | |
994 | { | |
995 | throw_incompatible_class_change_error (sub->getName ()); | |
996 | } | |
997 | } | |
998 | ||
999 | // FIXME: add interface circularity check here | |
1000 | if (sub == super) | |
1001 | { | |
1002 | throw_class_circularity_error (sub->getName ()); | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | void _Jv_ClassReader::handleFieldsBegin (int count) | |
1007 | { | |
1008 | def->fields = (_Jv_Field*) | |
1009 | _Jv_AllocBytesChecked (count * sizeof (_Jv_Field)); | |
1010 | def->field_count = count; | |
1011 | def->field_initializers = (_Jv_ushort*) | |
1012 | _Jv_AllocBytesChecked (count * sizeof (_Jv_ushort)); | |
1013 | for (int i = 0; i < count; i++) | |
1014 | def->field_initializers[i] = (_Jv_ushort) 0; | |
1015 | } | |
1016 | ||
1017 | void _Jv_ClassReader::handleField (int field_no, | |
1018 | int flags, | |
1019 | int name, | |
1020 | int desc) | |
1021 | { | |
e409a2c8 TT |
1022 | using namespace java::lang::reflect; |
1023 | ||
7941ceab | 1024 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
1025 | |
1026 | _Jv_Field *field = &def->fields[field_no]; | |
7941ceab | 1027 | _Jv_Utf8Const *field_name = pool_data[name].utf8; |
58eb6e7c AG |
1028 | |
1029 | #ifndef COMPACT_FIELDS | |
1030 | field->name = field_name; | |
1031 | #else | |
1032 | field->nameIndex = name; | |
1033 | #endif | |
1034 | ||
1035 | if (verify) | |
1036 | _Jv_VerifyIdentifier (field_name); | |
1037 | ||
1038 | // ignore flags we don't know about. | |
e409a2c8 | 1039 | field->flags = flags & Modifier::ALL_FLAGS; |
58eb6e7c AG |
1040 | |
1041 | if (verify) | |
1042 | { | |
e409a2c8 TT |
1043 | if (field->flags & (Modifier::SYNCHRONIZED |
1044 | | Modifier::NATIVE | |
1045 | | Modifier::INTERFACE | |
1046 | | Modifier::ABSTRACT)) | |
58eb6e7c AG |
1047 | throw_class_format_error ("erroneous field access flags"); |
1048 | ||
e409a2c8 TT |
1049 | if (1 < ( ((field->flags & Modifier::PUBLIC) ? 1 : 0) |
1050 | +((field->flags & Modifier::PRIVATE) ? 1 : 0) | |
1051 | +((field->flags & Modifier::PROTECTED) ? 1 : 0))) | |
58eb6e7c AG |
1052 | throw_class_format_error ("erroneous field access flags"); |
1053 | } | |
1054 | ||
7941ceab | 1055 | _Jv_Utf8Const* sig = pool_data[desc].utf8; |
58eb6e7c AG |
1056 | |
1057 | if (verify) | |
1058 | _Jv_VerifyFieldSignature (sig); | |
1059 | ||
1060 | // field->type is really a jclass, but while it is still | |
1061 | // unresolved we keep an _Jv_Utf8Const* instead. | |
1062 | field->type = (jclass) sig; | |
1063 | field->flags |= _Jv_FIELD_UNRESOLVED_FLAG; | |
1064 | field->u.boffset = 0; | |
1065 | } | |
1066 | ||
1067 | ||
1068 | void _Jv_ClassReader::handleConstantValueAttribute (int field_index, | |
1069 | int value) | |
1070 | { | |
e409a2c8 TT |
1071 | using namespace java::lang::reflect; |
1072 | ||
58eb6e7c AG |
1073 | _Jv_Field *field = &def->fields[field_index]; |
1074 | ||
e409a2c8 TT |
1075 | if ((field->flags & (Modifier::STATIC |
1076 | | Modifier::FINAL | |
1077 | | Modifier::PRIVATE)) == 0) | |
58eb6e7c AG |
1078 | { |
1079 | // Ignore, as per vmspec #4.7.2 | |
1080 | return; | |
1081 | } | |
1082 | ||
1083 | // do not allow multiple constant fields! | |
1084 | if (field->flags & _Jv_FIELD_CONSTANT_VALUE) | |
1085 | throw_class_format_error ("field has multiple ConstantValue attributes"); | |
1086 | ||
1087 | field->flags |= _Jv_FIELD_CONSTANT_VALUE; | |
1088 | def->field_initializers[field_index] = value; | |
1089 | ||
1090 | /* type check the initializer */ | |
1091 | ||
1092 | if (value <= 0 || value >= pool_count) | |
1093 | throw_class_format_error ("erroneous ConstantValue attribute"); | |
1094 | ||
1095 | /* FIXME: do the rest */ | |
1096 | } | |
1097 | ||
1098 | void _Jv_ClassReader::handleFieldsEnd () | |
1099 | { | |
e409a2c8 TT |
1100 | using namespace java::lang::reflect; |
1101 | ||
58eb6e7c AG |
1102 | // We need to reorganize the fields so that the static ones are first, |
1103 | // to conform to GCJ class layout. | |
1104 | ||
1105 | int low = 0; | |
1106 | int high = def->field_count-1; | |
1107 | _Jv_Field *fields = def->fields; | |
1108 | _Jv_ushort *inits = def->field_initializers; | |
1109 | ||
1110 | // this is kind of a raw version of quicksort. | |
1111 | while (low < high) | |
1112 | { | |
1113 | // go forward on low, while it's a static | |
e409a2c8 | 1114 | while (low < high && (fields[low].flags & Modifier::STATIC) != 0) |
58eb6e7c AG |
1115 | low++; |
1116 | ||
1117 | // go backwards on high, while it's a non-static | |
e409a2c8 | 1118 | while (low < high && (fields[high].flags & Modifier::STATIC) == 0) |
58eb6e7c AG |
1119 | high--; |
1120 | ||
1121 | if (low==high) | |
1122 | break; | |
1123 | ||
1124 | _Jv_Field tmp = fields[low]; | |
1125 | _Jv_ushort itmp = inits[low]; | |
1126 | ||
1127 | fields[low] = fields[high]; | |
1128 | inits[low] = inits[high]; | |
1129 | ||
1130 | fields[high] = tmp; | |
1131 | inits[high] = itmp; | |
1132 | ||
1133 | high -= 1; | |
1134 | low += 1; | |
1135 | } | |
1136 | ||
e409a2c8 | 1137 | if ((fields[low].flags & Modifier::STATIC) != 0) |
58eb6e7c AG |
1138 | low += 1; |
1139 | ||
1140 | def->static_field_count = low; | |
1141 | } | |
1142 | ||
1143 | ||
1144 | ||
facc279f TT |
1145 | void |
1146 | _Jv_ClassReader::handleMethodsBegin (int count) | |
58eb6e7c AG |
1147 | { |
1148 | def->methods = (_Jv_Method*) | |
1149 | _Jv_AllocBytesChecked (sizeof (_Jv_Method)*count); | |
1150 | ||
facc279f TT |
1151 | def->interpreted_methods |
1152 | = (_Jv_MethodBase **) _Jv_AllocBytesChecked (sizeof (_Jv_MethodBase *) | |
1153 | * count); | |
58eb6e7c AG |
1154 | |
1155 | for (int i = 0; i < count; i++) | |
1156 | def->interpreted_methods[i] = 0; | |
1157 | ||
1158 | def->method_count = count; | |
1159 | } | |
1160 | ||
1161 | ||
1162 | void _Jv_ClassReader::handleMethod | |
1163 | (int mth_index, int accflags, int name, int desc) | |
1164 | { | |
e409a2c8 TT |
1165 | using namespace java::lang::reflect; |
1166 | ||
7941ceab | 1167 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
1168 | _Jv_Method *method = &def->methods[mth_index]; |
1169 | ||
1170 | check_tag (name, JV_CONSTANT_Utf8); | |
1171 | prepare_pool_entry (name, JV_CONSTANT_Utf8); | |
7941ceab | 1172 | method->name = pool_data[name].utf8; |
58eb6e7c AG |
1173 | |
1174 | check_tag (desc, JV_CONSTANT_Utf8); | |
1175 | prepare_pool_entry (desc, JV_CONSTANT_Utf8); | |
7941ceab | 1176 | method->signature = pool_data[desc].utf8; |
58eb6e7c AG |
1177 | |
1178 | // ignore unknown flags | |
e409a2c8 | 1179 | method->accflags = accflags & Modifier::ALL_FLAGS; |
58eb6e7c AG |
1180 | |
1181 | // intialize... | |
1182 | method->ncode = 0; | |
1183 | ||
1184 | if (verify) | |
1185 | { | |
1186 | if (_Jv_equalUtf8Consts (method->name, clinit_name) | |
1187 | || _Jv_equalUtf8Consts (method->name, init_name)) | |
1188 | /* ignore */; | |
1189 | else | |
1190 | _Jv_VerifyIdentifier (method->name); | |
1191 | ||
1192 | _Jv_VerifyMethodSignature (method->signature); | |
1193 | ||
e409a2c8 TT |
1194 | if (method->accflags & (Modifier::VOLATILE |
1195 | | Modifier::TRANSIENT | |
1196 | | Modifier::INTERFACE)) | |
58eb6e7c AG |
1197 | throw_class_format_error ("erroneous method access flags"); |
1198 | ||
e409a2c8 TT |
1199 | if (1 < ( ((method->accflags & Modifier::PUBLIC) ? 1 : 0) |
1200 | +((method->accflags & Modifier::PRIVATE) ? 1 : 0) | |
1201 | +((method->accflags & Modifier::PROTECTED) ? 1 : 0))) | |
58eb6e7c AG |
1202 | throw_class_format_error ("erroneous method access flags"); |
1203 | } | |
1204 | } | |
1205 | ||
1206 | void _Jv_ClassReader::handleCodeAttribute | |
1207 | (int method_index, int max_stack, int max_locals, | |
1208 | int code_start, int code_length, int exc_table_length) | |
1209 | { | |
1210 | int size = _Jv_InterpMethod::size (exc_table_length, code_length); | |
1211 | _Jv_InterpMethod *method = | |
1212 | (_Jv_InterpMethod*) (_Jv_AllocBytesChecked (size)); | |
1213 | ||
1214 | method->max_stack = max_stack; | |
1215 | method->max_locals = max_locals; | |
1216 | method->code_length = code_length; | |
1217 | method->exc_count = exc_table_length; | |
1218 | method->defining_class = def; | |
1219 | method->self = &def->methods[method_index]; | |
1220 | ||
1221 | // grab the byte code! | |
1222 | memcpy ((void*) method->bytecode (), | |
1223 | (void*) (bytes+code_start), | |
1224 | code_length); | |
1225 | ||
1226 | def->interpreted_methods[method_index] = method; | |
1227 | ||
1228 | /* that's all we do for now */ | |
1229 | } | |
1230 | ||
1231 | void _Jv_ClassReader::handleExceptionTableEntry | |
1232 | (int method_index, int exc_index, | |
1233 | int start_pc, int end_pc, int handler_pc, int catch_type) | |
1234 | { | |
facc279f TT |
1235 | _Jv_InterpMethod *method = reinterpret_cast<_Jv_InterpMethod *> |
1236 | (def->interpreted_methods[method_index]); | |
58eb6e7c AG |
1237 | _Jv_InterpException *exc = method->exceptions (); |
1238 | ||
1239 | exc[exc_index].start_pc = start_pc; | |
1240 | exc[exc_index].end_pc = end_pc; | |
1241 | exc[exc_index].handler_pc = handler_pc; | |
1242 | exc[exc_index].handler_type = catch_type; | |
1243 | } | |
1244 | ||
1245 | void _Jv_ClassReader::handleMethodsEnd () | |
1246 | { | |
e409a2c8 TT |
1247 | using namespace java::lang::reflect; |
1248 | ||
58eb6e7c AG |
1249 | for (int i = 0; i < def->method_count; i++) |
1250 | { | |
1251 | _Jv_Method *method = &def->methods[i]; | |
facc279f TT |
1252 | if ((method->accflags & Modifier::NATIVE) != 0) |
1253 | { | |
1254 | if (def->interpreted_methods[i] != 0) | |
1255 | throw_class_format_error ("code provided for native method"); | |
1256 | else | |
1257 | { | |
1258 | _Jv_JNIMethod *m = (_Jv_JNIMethod *) | |
1259 | _Jv_AllocBytesChecked (sizeof (_Jv_JNIMethod)); | |
1260 | m->defining_class = def; | |
1261 | m->self = method; | |
1262 | m->function = NULL; | |
1263 | def->interpreted_methods[i] = m; | |
1264 | } | |
1265 | } | |
1266 | else if ((method->accflags & Modifier::ABSTRACT) != 0) | |
58eb6e7c AG |
1267 | { |
1268 | if (def->interpreted_methods[i] != 0) | |
facc279f | 1269 | throw_class_format_error ("code provided for abstract method"); |
58eb6e7c AG |
1270 | } |
1271 | else | |
1272 | { | |
1273 | if (def->interpreted_methods[i] == 0) | |
facc279f | 1274 | throw_class_format_error ("method with no code"); |
58eb6e7c AG |
1275 | } |
1276 | } | |
1277 | ||
1278 | } | |
1279 | ||
1280 | \f | |
1281 | /** This section takes care of verifying integrity of identifiers, | |
1282 | signatures, field ddescriptors, and class names */ | |
1283 | ||
1284 | #define UTF8_PEEK(PTR, LIMIT) \ | |
1285 | ({ unsigned char* xxkeep = (PTR); \ | |
1286 | int xxch = UTF8_GET(PTR,LIMIT); \ | |
1287 | PTR = xxkeep; xxch; }) | |
1288 | ||
1289 | /* verify one element of a type descriptor or signature */ | |
1290 | static unsigned char* | |
1291 | _Jv_VerifyOne (unsigned char* ptr, unsigned char* limit, bool void_ok) | |
1292 | { | |
1293 | if (ptr >= limit) | |
1294 | return 0; | |
1295 | ||
1296 | int ch = UTF8_GET (ptr, limit); | |
1297 | ||
1298 | switch (ch) | |
1299 | { | |
1300 | case 'V': | |
1301 | if (! void_ok) return 0; | |
1302 | ||
1303 | case 'S': case 'B': case 'I': case 'J': | |
1304 | case 'Z': case 'C': case 'F': case 'D': | |
1305 | break; | |
1306 | ||
1307 | case 'L': | |
1308 | { | |
1309 | unsigned char *start = ptr, *end; | |
1310 | do { | |
1311 | if (ptr > limit) | |
1312 | return 0; | |
1313 | ||
1314 | end = ptr; | |
1315 | ||
1316 | if ((ch = UTF8_GET (ptr, limit)) == -1) | |
1317 | return 0; | |
1318 | ||
1319 | } while (ch != ';'); | |
1320 | _Jv_VerifyClassName (start, (unsigned short) (end-start)); | |
1321 | } | |
1322 | break; | |
1323 | ||
1324 | case '[': | |
1325 | return _Jv_VerifyOne (ptr, limit, false); | |
1326 | break; | |
1327 | ||
1328 | default: | |
1329 | return 0; | |
1330 | } | |
1331 | ||
1332 | return ptr; | |
1333 | ||
1334 | } | |
1335 | ||
1336 | ||
1337 | /** verification and loading procedures **/ | |
1338 | ||
1339 | void | |
1340 | _Jv_VerifyFieldSignature (_Jv_Utf8Const*sig) | |
1341 | { | |
1342 | unsigned char* ptr = (unsigned char*) sig->data; | |
1343 | unsigned char* limit = ptr + sig->length; | |
1344 | ||
1345 | ptr = _Jv_VerifyOne (ptr, limit, false); | |
1346 | ||
1347 | if (ptr != limit) | |
1348 | throw_class_format_error ("erroneous type descriptor"); | |
1349 | } | |
1350 | ||
1351 | void | |
1352 | _Jv_VerifyMethodSignature (_Jv_Utf8Const*sig) | |
1353 | { | |
1354 | unsigned char* ptr = (unsigned char*) sig->data; | |
1355 | unsigned char* limit = ptr + sig->length; | |
1356 | ||
1357 | if (ptr == limit) | |
1358 | throw_class_format_error ("erroneous type descriptor"); | |
1359 | ||
1360 | if (UTF8_GET(ptr,limit) != '(') | |
1361 | throw_class_format_error ("erroneous type descriptor"); | |
1362 | ||
1363 | while (ptr && UTF8_PEEK (ptr, limit) != ')') | |
1364 | ptr = _Jv_VerifyOne (ptr, limit, false); | |
1365 | ||
1366 | if (UTF8_GET (ptr, limit) != ')') | |
1367 | throw_class_format_error ("erroneous type descriptor"); | |
1368 | ||
1369 | // get the return type | |
1370 | ptr = _Jv_VerifyOne (ptr, limit, true); | |
1371 | ||
1372 | if (ptr != limit) | |
1373 | throw_class_format_error ("erroneous type descriptor"); | |
1374 | ||
1375 | return; | |
1376 | ||
1377 | } | |
1378 | ||
1379 | /* we try to avoid calling the Character methods all the time, | |
1380 | in fact, they will only be called for non-standard things */ | |
1381 | ||
1382 | static __inline__ int | |
1383 | is_identifier_start (int c) | |
1384 | { | |
1385 | unsigned int ch = (unsigned)c; | |
1386 | ||
1387 | if ((ch - 0x41U) < 29U) /* A ... Z */ | |
1388 | return 1; | |
1389 | if ((ch - 0x61U) < 29U) /* a ... z */ | |
1390 | return 1; | |
1391 | if (ch == 0x5FU) /* _ */ | |
1392 | return 1; | |
1393 | ||
1394 | return character->isJavaIdentifierStart ((jchar) ch); | |
1395 | } | |
1396 | ||
1397 | static __inline__ int | |
1398 | is_identifier_part (int c) | |
1399 | { | |
1400 | unsigned int ch = (unsigned)c; | |
1401 | ||
1402 | if ((ch - 0x41U) < 29U) /* A ... Z */ | |
1403 | return 1; | |
1404 | if ((ch - 0x61U) < 29U) /* a ... z */ | |
1405 | return 1; | |
1406 | if ((ch - 0x30) < 10U) /* 0 .. 9 */ | |
1407 | return 1; | |
1408 | if (ch == 0x5FU || ch == 0x24U) /* _ $ */ | |
1409 | return 1; | |
1410 | ||
1411 | return character->isJavaIdentifierStart ((jchar) ch); | |
1412 | } | |
1413 | ||
1414 | void | |
1415 | _Jv_VerifyIdentifier (_Jv_Utf8Const* name) | |
1416 | { | |
1417 | unsigned char *ptr = (unsigned char*) name->data; | |
1418 | unsigned char *limit = ptr + name->length; | |
1419 | int ch; | |
1420 | ||
1421 | if ((ch = UTF8_GET (ptr, limit))==-1 | |
1422 | || ! is_identifier_start (ch)) | |
1423 | throw_class_format_error ("erroneous identifier"); | |
1424 | ||
1425 | while (ptr != limit) | |
1426 | { | |
1427 | if ((ch = UTF8_GET (ptr, limit))==-1 | |
1428 | || ! is_identifier_part (ch)) | |
1429 | throw_class_format_error ("erroneous identifier"); | |
1430 | } | |
1431 | } | |
1432 | ||
1433 | ||
1434 | void | |
1435 | _Jv_VerifyClassName (unsigned char* ptr, _Jv_ushort length) | |
1436 | { | |
1437 | unsigned char *limit = ptr+length; | |
1438 | int ch; | |
1439 | ||
e3253af5 AG |
1440 | if ('[' == UTF8_PEEK (ptr, limit)) |
1441 | { | |
1442 | if (! _Jv_VerifyOne (++ptr, limit, false)) | |
1443 | throw_class_format_error ("erroneous class name"); | |
1444 | else | |
1445 | return; | |
1446 | } | |
1447 | ||
58eb6e7c AG |
1448 | next_level: |
1449 | do { | |
1450 | if ((ch = UTF8_GET (ptr, limit))==-1) | |
1451 | throw_class_format_error ("erroneous class name"); | |
1452 | if (! is_identifier_start (ch)) | |
1453 | throw_class_format_error ("erroneous class name"); | |
1454 | do { | |
1455 | if (ptr == limit) | |
1456 | return; | |
1457 | else if ((ch = UTF8_GET (ptr, limit))==-1) | |
1458 | throw_class_format_error ("erroneous class name"); | |
1459 | else if (ch == '.') | |
1460 | goto next_level; | |
1461 | else if (! is_identifier_part (ch)) | |
1462 | throw_class_format_error ("erroneous class name"); | |
1463 | } while (true); | |
1464 | } while (true); | |
1465 | ||
1466 | } | |
1467 | ||
1468 | void | |
1469 | _Jv_VerifyClassName (_Jv_Utf8Const *name) | |
1470 | { | |
1471 | _Jv_VerifyClassName ((unsigned char*)&name->data[0], | |
1472 | (_Jv_ushort) name->length); | |
1473 | } | |
1474 | ||
1475 | ||
1476 | /** returns true, if name1 and name2 represents classes in the same | |
1477 | package. */ | |
1478 | ||
1479 | bool | |
1480 | _Jv_ClassNameSamePackage (_Jv_Utf8Const *name1, _Jv_Utf8Const *name2) | |
1481 | { | |
1482 | unsigned char* ptr1 = (unsigned char*) name1->data; | |
1483 | unsigned char* limit1 = ptr1 + name1->length; | |
1484 | ||
1485 | unsigned char* last1 = ptr1; | |
1486 | ||
1487 | // scan name1, and find the last occurrence of '.' | |
1488 | while (ptr1 < limit1) { | |
1489 | int ch1 = UTF8_GET (ptr1, limit1); | |
1490 | ||
1491 | if (ch1 == '.') | |
1492 | last1 = ptr1; | |
1493 | ||
1494 | else if (ch1 == -1) | |
1495 | return false; | |
1496 | } | |
1497 | ||
1498 | // now the length of name1's package name is len | |
1499 | int len = last1 - (unsigned char*) name1->data; | |
1500 | ||
1501 | // if this is longer than name2, then we're off | |
1502 | if (len > name2->length) | |
1503 | return false; | |
1504 | ||
1505 | // then compare the first len bytes for equality | |
1506 | if (memcmp ((void*) name1->data, (void*) name2->data, len) == 0) | |
1507 | { | |
1508 | // check that there are no .'s after position len in name2 | |
1509 | ||
1510 | unsigned char* ptr2 = (unsigned char*) name2->data + len; | |
1511 | unsigned char* limit2 = | |
1512 | (unsigned char*) name2->data + name2->length; | |
1513 | ||
1514 | while (ptr2 < limit2) | |
1515 | { | |
1516 | int ch2 = UTF8_GET (ptr2, limit2); | |
1517 | if (ch2 == -1 || ch2 == '.') | |
1518 | return false; | |
1519 | } | |
1520 | return true; | |
1521 | } | |
1522 | return false; | |
1523 | } | |
1524 | ||
1525 | ||
1526 | \f | |
1527 | /** Here we define the exceptions that can be thrown */ | |
1528 | ||
1529 | static void | |
1530 | throw_no_class_def_found_error (jstring msg) | |
1531 | { | |
1532 | if (msg == 0) | |
1533 | JvThrow (new java::lang::NoClassDefFoundError); | |
1534 | else | |
1535 | JvThrow (new java::lang::NoClassDefFoundError (msg)); | |
1536 | } | |
1537 | ||
1538 | static void | |
1539 | throw_no_class_def_found_error (char *msg) | |
1540 | { | |
1541 | throw_no_class_def_found_error (JvNewStringLatin1 (msg)); | |
1542 | } | |
1543 | ||
1544 | static void | |
1545 | throw_class_format_error (jstring msg) | |
1546 | { | |
1547 | if (msg == 0) | |
1548 | JvThrow (new java::lang::ClassFormatError); | |
1549 | else | |
1550 | JvThrow (new java::lang::ClassFormatError (msg)); | |
1551 | } | |
1552 | ||
1553 | static void | |
1554 | throw_class_format_error (char *msg) | |
1555 | { | |
1556 | throw_class_format_error (JvNewStringLatin1 (msg)); | |
1557 | } | |
1558 | ||
1559 | static void | |
1560 | throw_internal_error (char *msg) | |
1561 | { | |
1562 | JvThrow | |
1563 | (new java::lang::InternalError (JvNewStringLatin1 (msg))); | |
1564 | } | |
1565 | ||
1566 | static jfloat int_bits_to_float (jint value) | |
1567 | { | |
1568 | return java::lang::Float::intBitsToFloat (value); | |
1569 | } | |
1570 | ||
1571 | static jdouble long_bits_to_double (jlong value) | |
1572 | { | |
1573 | return java::lang::Double::longBitsToDouble (value); | |
1574 | } | |
1575 | ||
1576 | static void throw_incompatible_class_change_error (jstring msg) | |
1577 | { | |
1578 | JvThrow (new java::lang::IncompatibleClassChangeError (msg)); | |
1579 | } | |
1580 | ||
1581 | static void throw_class_circularity_error (jstring msg) | |
1582 | { | |
1583 | JvThrow (new java::lang::ClassCircularityError (msg)); | |
1584 | } | |
1585 | ||
1586 | #endif /* INTERPRETER */ | |
1587 |