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1 | // defineclass.cc - defining a class from .class format. |
2 | ||
3 | /* Copyright (C) 1999 Cygnus Solutions | |
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 | ||
21 | #include <java-interp.h> | |
22 | ||
23 | #ifdef INTERPRETER | |
24 | ||
25 | #include <java-cpool.h> | |
26 | #include <cni.h> | |
27 | ||
28 | #include <java/lang/Class.h> | |
29 | #include <java/lang/Float.h> | |
30 | #include <java/lang/Double.h> | |
31 | #include <java/lang/Character.h> | |
32 | #include <java/lang/LinkageError.h> | |
33 | #include <java/lang/InternalError.h> | |
34 | #include <java/lang/ClassFormatError.h> | |
35 | #include <java/lang/NoClassDefFoundError.h> | |
36 | #include <java/lang/ClassCircularityError.h> | |
37 | #include <java/lang/ClassNotFoundException.h> | |
38 | #include <java/lang/IncompatibleClassChangeError.h> | |
39 | ||
40 | #define ClassClass _CL_Q34java4lang5Class | |
41 | extern java::lang::Class ClassClass; | |
42 | #define StringClass _CL_Q34java4lang6String | |
43 | extern java::lang::Class StringClass; | |
44 | #define ClassObject _CL_Q34java4lang6Object | |
45 | extern java::lang::Class ClassObject; | |
46 | ||
47 | // we don't verify method names that match these. | |
48 | static _Jv_Utf8Const *clinit_name = _Jv_makeUtf8Const ("<clinit>", 8); | |
49 | static _Jv_Utf8Const *init_name = _Jv_makeUtf8Const ("<init>", 6); | |
50 | ||
51 | ||
52 | // these go in some seperate functions, to avoid having _Jv_InitClass | |
53 | // inserted all over the place. | |
54 | static void throw_internal_error (char *msg) | |
55 | __attribute__ ((__noreturn__)); | |
56 | static void throw_no_class_def_found_error (jstring msg) | |
57 | __attribute__ ((__noreturn__)); | |
58 | static void throw_no_class_def_found_error (char *msg) | |
59 | __attribute__ ((__noreturn__)); | |
60 | static void throw_class_format_error (jstring msg) | |
61 | __attribute__ ((__noreturn__)); | |
62 | static void throw_class_format_error (char *msg) | |
63 | __attribute__ ((__noreturn__)); | |
64 | static void throw_incompatible_class_change_error (jstring msg) | |
65 | __attribute__ ((__noreturn__)); | |
66 | static void throw_class_circularity_error (jstring msg) | |
67 | __attribute__ ((__noreturn__)); | |
68 | ||
69 | static jdouble long_bits_to_double (jlong); | |
70 | static jfloat int_bits_to_float (jint); | |
71 | ||
72 | /** | |
73 | * We define class reading using a class. It is practical, since then | |
74 | * the entire class-reader can be a friend of class Class (it needs to | |
75 | * write all it's different structures); but also because this makes it | |
76 | * easy to make class definition reentrant, and thus two threads can be | |
77 | * defining classes at the same time. This class (_Jv_ClassReader) is | |
78 | * never exposed outside this file, so we don't have to worry about | |
79 | * public or private members here. | |
80 | */ | |
81 | ||
82 | struct _Jv_ClassReader { | |
83 | ||
84 | // do verification? Currently, there is no option to disable this. | |
85 | // This flag just controls the verificaiton done by the class loader; | |
86 | // i.e., checking the integrity of the constant pool; and it is | |
87 | // allways on. You always want this as far as I can see, but it also | |
88 | // controls weither identifiers and type descriptors/signatures are | |
89 | // verified as legal. This could be somewhat more expensive since it | |
90 | // will call Characher.isJavaIdentifier{Start,Part} for each character | |
91 | // in any identifier (field name or method name) it comes by. Thus, | |
92 | // it might be useful to turn off this verification for classes that | |
93 | // come from a trusted source. However, for GCJ, trusted classes are | |
94 | // most likely to be linked in. | |
95 | ||
96 | bool verify; | |
97 | ||
98 | // input data. | |
99 | unsigned char *bytes; | |
100 | int len; | |
101 | ||
102 | // current input position | |
103 | int pos; | |
104 | ||
105 | // the constant pool data | |
106 | int pool_count; | |
107 | unsigned char *tags; | |
108 | unsigned int *offsets; | |
109 | ||
110 | // the class to define (see java-interp.h) | |
111 | _Jv_InterpClass *def; | |
112 | ||
113 | /* check that the given number of input bytes are available */ | |
114 | inline void check (int num) | |
115 | { | |
116 | if (pos + num > len) | |
117 | throw_class_format_error ("Premature end of data"); | |
118 | } | |
119 | ||
120 | /* skip a given number of bytes in input */ | |
121 | inline void skip (int num) | |
122 | { | |
123 | check (num); | |
124 | pos += num; | |
125 | } | |
126 | ||
127 | /* read an unsignend 1-byte unit */ | |
128 | inline static jint get1u (unsigned char* bytes) | |
129 | { | |
130 | return bytes[0]; | |
131 | } | |
132 | ||
133 | /* read an unsigned 1-byte unit */ | |
134 | inline jint read1u () | |
135 | { | |
136 | skip (1); | |
137 | return get1u (bytes+pos-1); | |
138 | } | |
139 | ||
140 | /* read an unsigned 2-byte unit */ | |
141 | inline static jint get2u (unsigned char *bytes) | |
142 | { | |
143 | return (((jint)bytes[0]) << 8) | ((jint)bytes[1]); | |
144 | } | |
145 | ||
146 | /* read an unsigned 2-byte unit */ | |
147 | inline jint read2u () | |
148 | { | |
149 | skip (2); | |
150 | return get2u (bytes+pos-2); | |
151 | } | |
152 | ||
153 | /* read a 4-byte unit */ | |
154 | static jint get4 (unsigned char *bytes) | |
155 | { | |
156 | return (((jint)bytes[0]) << 24) | |
157 | | (((jint)bytes[1]) << 16) | |
158 | | (((jint)bytes[2]) << 8) | |
159 | | (((jint)bytes[3]) << 0); | |
160 | } | |
161 | ||
162 | /* read a 4-byte unit, (we don't do that quite so often) */ | |
163 | inline jint read4 () | |
164 | { | |
165 | skip (4); | |
166 | return get4 (bytes+pos-4); | |
167 | } | |
168 | ||
169 | /* read a 8-byte unit */ | |
170 | static jlong get8 (unsigned char* bytes) | |
171 | { | |
172 | return (((jlong)bytes[0]) << 56) | |
173 | | (((jlong)bytes[1]) << 48) | |
174 | | (((jlong)bytes[2]) << 40) | |
175 | | (((jlong)bytes[3]) << 32) | |
176 | | (((jlong)bytes[4]) << 24) | |
177 | | (((jlong)bytes[5]) << 16) | |
178 | | (((jlong)bytes[6]) << 8) | |
179 | | (((jlong)bytes[7]) << 0); | |
180 | } | |
181 | ||
182 | /* read a 8-byte unit */ | |
183 | inline jlong read8 () | |
184 | { | |
185 | skip (8); | |
186 | return get8 (bytes+pos-8); | |
187 | } | |
188 | ||
189 | inline void check_tag (int index, char expected_tag) | |
190 | { | |
191 | if (index < 0 | |
192 | || index > pool_count | |
193 | || tags[index] != expected_tag) | |
194 | throw_class_format_error ("erroneous constant pool tag"); | |
195 | } | |
196 | ||
197 | _Jv_ClassReader (jclass klass, jbyteArray data, jint offset, jint length) | |
198 | { | |
199 | if (klass == 0 || length < 0 || offset+length > data->length) | |
200 | throw_internal_error ("arguments to _Jv_DefineClass"); | |
201 | ||
202 | verify = true; | |
203 | bytes = (unsigned char*) (elements (data)+offset); | |
204 | len = length; | |
205 | pos = 0; | |
206 | def = (_Jv_InterpClass*) klass; | |
207 | } | |
208 | ||
209 | /** and here goes the parser members defined out-of-line */ | |
210 | void parse (); | |
211 | void read_constpool (); | |
212 | void prepare_pool_entry (int index, unsigned char tag); | |
213 | void read_fields (); | |
214 | void read_methods (); | |
215 | void read_one_class_attribute (); | |
216 | void read_one_method_attribute (int method); | |
217 | void read_one_code_attribute (int method); | |
218 | void read_one_field_attribute (int field); | |
219 | ||
220 | /** check an utf8 entry, without creating a Utf8Const object */ | |
221 | bool is_attribute_name (int index, char *name); | |
222 | ||
223 | /** here goes the class-loader members defined out-of-line */ | |
224 | void handleConstantPool (); | |
225 | void handleClassBegin (int, int, int); | |
226 | void handleInterfacesBegin (int); | |
227 | void handleInterface (int, int); | |
228 | void handleFieldsBegin (int); | |
229 | void handleField (int, int, int, int); | |
230 | void handleFieldsEnd (); | |
231 | void handleConstantValueAttribute (int,int); | |
232 | void handleMethodsBegin (int); | |
233 | void handleMethod (int, int, int, int); | |
234 | void handleMethodsEnd (); | |
235 | void handleCodeAttribute (int, int, int, int, int, int); | |
236 | void handleExceptionTableEntry (int, int, int, int, int, int); | |
237 | ||
238 | void checkExtends (jclass sub, jclass super); | |
239 | void checkImplements (jclass sub, jclass super); | |
240 | ||
241 | /* | |
242 | * FIXME: we should keep a hash table of utf8-strings, since many will | |
243 | * be the same. It's a little tricky, however, because the hash table | |
244 | * needs to interact gracefully with the garbage collector. Much | |
245 | * memory is to be saved by this, however! perhaps the improvement | |
246 | * could be implemented in prims.cc (_Jv_makeUtf8Const), since it | |
247 | * computes the hash value anyway. | |
248 | */ | |
249 | ||
250 | static const int PUBLIC = 0x001; | |
251 | static const int PRIVATE = 0x002; | |
252 | static const int PROTECTED = 0x004; | |
253 | static const int STATIC = 0x008; | |
254 | static const int FINAL = 0x010; | |
255 | static const int SYNCHRONIZED = 0x020; | |
256 | static const int VOLATILE = 0x040; | |
257 | static const int TRANSIENT = 0x080; | |
258 | static const int NATIVE = 0x100; | |
259 | static const int INTERFACE = 0x200; | |
260 | static const int ABSTRACT = 0x400; | |
261 | static const int ALL_FLAGS = 0x7FF; | |
262 | ||
263 | }; | |
264 | ||
265 | /* This is used for the isJavaIdentifierStart & isJavaIdentifierPart | |
266 | methods, so we avoid doing _Jv_InitClass all the time */ | |
267 | ||
268 | static const java::lang::Character *character = 0; | |
269 | static void prepare_character (); | |
270 | ||
271 | void | |
272 | _Jv_DefineClass (jclass klass, jbyteArray data, jint offset, jint length) | |
273 | { | |
274 | if (character == 0) | |
275 | prepare_character (); | |
276 | ||
277 | _Jv_ClassReader reader (klass, data, offset, length); | |
278 | reader.parse(); | |
279 | ||
280 | /* that's it! */ | |
281 | } | |
282 | ||
283 | /** put it after _Jv_DefineClass, so it doesn't get inlined */ | |
284 | static void prepare_character () | |
285 | { | |
286 | character = new java::lang::Character ('!'); | |
287 | } | |
288 | ||
289 | \f | |
290 | /** This section defines the parsing/scanning of the class data */ | |
291 | ||
292 | void | |
293 | _Jv_ClassReader::parse () | |
294 | { | |
295 | int magic = read4 (); | |
296 | ||
297 | /* FIXME: Decide which range of version numbers to allow */ | |
298 | ||
299 | /* int minor_version = */ read2u (); | |
300 | /* int major_verson = */ read2u (); | |
301 | ||
302 | if (magic != (int) 0xCAFEBABE) | |
303 | throw_class_format_error ("bad magic number"); | |
304 | ||
305 | pool_count = read2u (); | |
306 | ||
307 | read_constpool (); | |
308 | ||
309 | int access_flags = read2u (); | |
310 | int this_class = read2u (); | |
311 | int super_class = read2u (); | |
312 | ||
313 | check_tag (this_class, JV_CONSTANT_Class); | |
314 | if (super_class != 0) | |
315 | check_tag (super_class, JV_CONSTANT_Class); | |
316 | ||
317 | handleClassBegin (access_flags, this_class, super_class); | |
318 | ||
319 | int interfaces_count = read2u (); | |
320 | ||
321 | handleInterfacesBegin (interfaces_count); | |
322 | ||
323 | for (int i = 0; i < interfaces_count; i++) | |
324 | { | |
325 | int iface = read2u (); | |
326 | check_tag (iface, JV_CONSTANT_Class); | |
327 | handleInterface (i, iface); | |
328 | } | |
329 | ||
330 | read_fields (); | |
331 | read_methods (); | |
332 | ||
333 | int attributes_count = read2u (); | |
334 | ||
335 | for (int i = 0; i < attributes_count; i++) | |
336 | { | |
337 | read_one_class_attribute (); | |
338 | } | |
339 | ||
340 | if (pos != len) | |
341 | throw_class_format_error ("unused data before end of file"); | |
342 | ||
343 | // tell everyone we're done. | |
344 | def->state = JV_STATE_LOADED; | |
345 | def->notifyAll (); | |
346 | ||
347 | } | |
348 | ||
349 | void _Jv_ClassReader::read_constpool () | |
350 | { | |
351 | tags = (unsigned char*) _Jv_AllocBytesChecked (pool_count); | |
352 | offsets = (unsigned int *) _Jv_AllocBytesChecked (sizeof (int) | |
353 | * pool_count) ; | |
354 | ||
355 | /** first, we scan the constant pool, collecting tags and offsets */ | |
356 | tags[0] = JV_CONSTANT_Undefined; | |
357 | offsets[0] = pos; | |
358 | for (int c = 1; c < pool_count; c++) | |
359 | { | |
360 | tags[c] = read1u (); | |
361 | offsets[c] = pos; | |
362 | ||
363 | switch (tags[c]) | |
364 | { | |
365 | case JV_CONSTANT_String: | |
366 | case JV_CONSTANT_Class: | |
367 | skip (2); | |
368 | break; | |
369 | ||
370 | case JV_CONSTANT_Fieldref: | |
371 | case JV_CONSTANT_Methodref: | |
372 | case JV_CONSTANT_InterfaceMethodref: | |
373 | case JV_CONSTANT_NameAndType: | |
374 | case JV_CONSTANT_Integer: | |
375 | case JV_CONSTANT_Float: | |
376 | skip (4); | |
377 | break; | |
378 | ||
379 | case JV_CONSTANT_Double: | |
380 | case JV_CONSTANT_Long: | |
381 | skip (8); | |
382 | tags[++c] = JV_CONSTANT_Undefined; | |
383 | break; | |
384 | ||
385 | case JV_CONSTANT_Utf8: | |
386 | { | |
387 | int len = read2u (); | |
388 | skip (len); | |
389 | } | |
390 | break; | |
391 | ||
392 | case JV_CONSTANT_Unicode: | |
393 | throw_class_format_error ("unicode not supported"); | |
394 | break; | |
395 | ||
396 | default: | |
397 | throw_class_format_error ("erroneous constant pool tag"); | |
398 | } | |
399 | } | |
400 | ||
401 | handleConstantPool (); | |
402 | } | |
403 | ||
404 | ||
405 | void _Jv_ClassReader::read_fields () | |
406 | { | |
407 | int fields_count = read2u (); | |
408 | handleFieldsBegin (fields_count); | |
409 | ||
410 | for (int i = 0; i < fields_count; i++) | |
411 | { | |
412 | int access_flags = read2u (); | |
413 | int name_index = read2u (); | |
414 | int descriptor_index = read2u (); | |
415 | int attributes_count = read2u (); | |
416 | ||
417 | check_tag (name_index, JV_CONSTANT_Utf8); | |
418 | prepare_pool_entry (name_index, JV_CONSTANT_Utf8); | |
419 | ||
420 | check_tag (descriptor_index, JV_CONSTANT_Utf8); | |
421 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
422 | ||
423 | handleField (i, access_flags, name_index, descriptor_index); | |
424 | ||
425 | for (int j = 0; j < attributes_count; j++) | |
426 | { | |
427 | read_one_field_attribute (i); | |
428 | } | |
429 | } | |
430 | ||
431 | handleFieldsEnd (); | |
432 | } | |
433 | ||
434 | bool | |
435 | _Jv_ClassReader::is_attribute_name (int index, char *name) | |
436 | { | |
437 | check_tag (index, JV_CONSTANT_Utf8); | |
438 | int len = get2u (bytes+offsets[index]); | |
439 | if (len != (int) strlen (name)) | |
440 | return false; | |
441 | else | |
442 | return !memcmp (bytes+offsets[index]+2, name, len); | |
443 | } | |
444 | ||
445 | void _Jv_ClassReader::read_one_field_attribute (int field_index) | |
446 | { | |
447 | int name = read2u (); | |
448 | int length = read4 (); | |
449 | ||
450 | if (is_attribute_name (name, "ConstantValue")) | |
451 | { | |
452 | int cv = read2u (); | |
453 | ||
454 | if (cv < pool_count | |
455 | && cv > 0 | |
456 | && (tags[cv] == JV_CONSTANT_Integer | |
457 | || tags[cv] == JV_CONSTANT_Float | |
458 | || tags[cv] == JV_CONSTANT_Long | |
459 | || tags[cv] == JV_CONSTANT_Double | |
460 | || tags[cv] == JV_CONSTANT_String)) | |
461 | { | |
462 | handleConstantValueAttribute (field_index, cv); | |
463 | } | |
464 | else | |
465 | { | |
466 | throw_class_format_error ("erroneous ConstantValue attribute"); | |
467 | } | |
468 | ||
469 | if (length != 2) | |
470 | throw_class_format_error ("erroneous ConstantValue attribute"); | |
471 | } | |
472 | ||
473 | else | |
474 | { | |
475 | skip (length); | |
476 | } | |
477 | } | |
478 | ||
479 | void _Jv_ClassReader::read_methods () | |
480 | { | |
481 | int methods_count = read2u (); | |
482 | ||
483 | handleMethodsBegin (methods_count); | |
484 | ||
485 | for (int i = 0; i < methods_count; i++) | |
486 | { | |
487 | int access_flags = read2u (); | |
488 | int name_index = read2u (); | |
489 | int descriptor_index = read2u (); | |
490 | int attributes_count = read2u (); | |
491 | ||
492 | check_tag (name_index, JV_CONSTANT_Utf8); | |
493 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
494 | ||
495 | check_tag (name_index, JV_CONSTANT_Utf8); | |
496 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
497 | ||
498 | handleMethod (i, access_flags, name_index, | |
499 | descriptor_index); | |
500 | ||
501 | for (int j = 0; j < attributes_count; j++) | |
502 | { | |
503 | read_one_method_attribute (i); | |
504 | } | |
505 | } | |
506 | ||
507 | handleMethodsEnd (); | |
508 | } | |
509 | ||
510 | void _Jv_ClassReader::read_one_method_attribute (int method_index) | |
511 | { | |
512 | int name = read2u (); | |
513 | int length = read4 (); | |
514 | ||
515 | if (is_attribute_name (name, "Exceptions")) | |
516 | { | |
517 | /* we ignore this for now */ | |
518 | skip (length); | |
519 | } | |
520 | ||
521 | else if (is_attribute_name (name, "Code")) | |
522 | { | |
523 | int start_off = pos; | |
524 | int max_stack = read2u (); | |
525 | int max_locals = read2u (); | |
526 | int code_length = read4 (); | |
527 | ||
528 | int code_start = pos; | |
529 | skip (code_length); | |
530 | int exception_table_length = read2u (); | |
531 | ||
532 | handleCodeAttribute (method_index, | |
533 | max_stack, max_locals, | |
534 | code_start, code_length, | |
535 | exception_table_length); | |
536 | ||
537 | ||
538 | for (int i = 0; i < exception_table_length; i++) | |
539 | { | |
540 | int start_pc = read2u (); | |
541 | int end_pc = read2u (); | |
542 | int handler_pc = read2u (); | |
543 | int catch_type = read2u (); | |
544 | ||
545 | if (start_pc > end_pc | |
546 | || start_pc < 0 | |
547 | || end_pc >= code_length | |
548 | || handler_pc >= code_length) | |
549 | throw_class_format_error ("erroneous exception handler info"); | |
550 | ||
551 | if (! (tags[catch_type] == JV_CONSTANT_Class | |
552 | || tags[catch_type] == 0)) | |
553 | { | |
554 | throw_class_format_error ("erroneous exception handler info"); | |
555 | } | |
556 | ||
557 | handleExceptionTableEntry (method_index, | |
558 | i, | |
559 | start_pc, | |
560 | end_pc, | |
561 | handler_pc, | |
562 | catch_type); | |
563 | ||
564 | } | |
565 | ||
566 | int attributes_count = read2u (); | |
567 | ||
568 | for (int i = 0; i < attributes_count; i++) | |
569 | { | |
570 | read_one_code_attribute (method_index); | |
571 | } | |
572 | ||
573 | if ((pos - start_off) != length) | |
574 | throw_class_format_error ("code attribute too short"); | |
575 | } | |
576 | ||
577 | else | |
578 | { | |
579 | /* ignore unknown attributes */ | |
580 | skip (length); | |
581 | } | |
582 | } | |
583 | ||
584 | void _Jv_ClassReader::read_one_code_attribute (int /*method*/) | |
585 | { | |
586 | /* ignore for now, ... later we may want to pick up | |
587 | line number information, for debugging purposes; | |
588 | in fact, the whole debugger issue is open! */ | |
589 | ||
590 | /* int name = */ read2u (); | |
591 | int length = read4 (); | |
592 | skip (length); | |
593 | ||
594 | } | |
595 | ||
596 | void _Jv_ClassReader::read_one_class_attribute () | |
597 | { | |
598 | /* we also ignore the class attributes, ... | |
599 | some day we'll add inner-classes support. */ | |
600 | ||
601 | /* int name = */ read2u (); | |
602 | int length = read4 (); | |
603 | skip (length); | |
604 | } | |
605 | ||
606 | ||
607 | ||
608 | \f | |
609 | /* this section defines the semantic actions of the parser */ | |
610 | ||
611 | void _Jv_ClassReader::handleConstantPool () | |
612 | { | |
613 | /** now, we actually define the class' constant pool */ | |
614 | ||
615 | // the pool is scanned explicitly by the collector | |
616 | jbyte *pool_tags = (jbyte*) _Jv_AllocBytesChecked (pool_count); | |
617 | void **pool_data = (void**) _Jv_AllocBytesChecked (pool_count * sizeof (void*)); | |
618 | ||
619 | def->constants.tags = pool_tags; | |
620 | def->constants.data = pool_data; | |
621 | def->constants.size = pool_count; | |
622 | ||
623 | // Here we make a pass to collect the strings! We do this, because | |
624 | // internally in the GCJ runtime, classes are encoded with .'s not /'s. | |
625 | // Therefore, we first collect the strings, and then translate the rest | |
626 | // of the utf8-entries (thus not representing strings) from /-notation | |
627 | // to .-notation. | |
628 | for (int i = 1; i < pool_count; i++) | |
629 | { | |
630 | if (tags[i] == JV_CONSTANT_String) | |
631 | { | |
632 | unsigned char* str_data = bytes + offsets [i]; | |
633 | int utf_index = get2u (str_data); | |
634 | check_tag (utf_index, JV_CONSTANT_Utf8); | |
635 | unsigned char *utf_data = bytes + offsets[utf_index]; | |
636 | int len = get2u (utf_data); | |
637 | pool_data[i] = (void*)_Jv_makeUtf8Const ((char*)(utf_data+2), len); | |
638 | pool_tags[i] = JV_CONSTANT_String; | |
639 | } | |
640 | else | |
641 | { | |
642 | pool_tags[i] = JV_CONSTANT_Undefined; | |
643 | } | |
644 | } | |
645 | ||
646 | // and now, we scan everything else but strings & utf8-entries. This | |
647 | // leaves out those utf8-entries which are not used; which will be left | |
648 | // with a tag of JV_CONSTANT_Undefined in the class definition. | |
649 | for (int index = 1; index < pool_count; index++) | |
650 | { | |
651 | switch (tags[index]) | |
652 | { | |
653 | case JV_CONSTANT_Undefined: | |
654 | case JV_CONSTANT_String: | |
655 | case JV_CONSTANT_Utf8: | |
656 | continue; | |
657 | ||
658 | default: | |
659 | prepare_pool_entry (index, tags[index]); | |
660 | } | |
661 | } | |
662 | ||
663 | } | |
664 | ||
665 | /* this is a recursive procedure, which will prepare pool entries as needed. | |
666 | Which is how we avoid initializing those entries which go unused. */ | |
667 | void | |
668 | _Jv_ClassReader::prepare_pool_entry (int index, unsigned char this_tag) | |
669 | { | |
670 | /* these two, pool_data and pool_tags, point into the class | |
671 | structure we are currently defining */ | |
672 | ||
673 | unsigned char *pool_tags = (unsigned char*) def->constants.tags; | |
674 | void **pool_data = (void**) def->constants.data; | |
675 | ||
676 | /* this entry was already prepared */ | |
677 | if (pool_tags[index] == this_tag) | |
678 | return; | |
679 | ||
680 | /* this_data points to the constant-pool information for the current | |
681 | constant-pool entry */ | |
682 | ||
683 | unsigned char *this_data = bytes + offsets[index]; | |
684 | ||
685 | switch (this_tag) | |
686 | { | |
687 | case JV_CONSTANT_Utf8: | |
688 | { | |
689 | // If we came here, it is because some other tag needs this | |
690 | // utf8-entry for type information! Thus, we translate /'s to .'s in | |
691 | // order to accomondate gcj's internal representation. | |
692 | ||
693 | int len = get2u (this_data); | |
694 | char *buffer = (char*) alloca (len); | |
695 | char *s = ((char*) this_data)+2; | |
696 | ||
697 | /* FIXME: avoid using a buffer here */ | |
698 | for (int i = 0; i < len; i++) | |
699 | { | |
700 | if (s[i] == '/') | |
701 | buffer[i] = '.'; | |
702 | else | |
703 | buffer[i] = (char) s[i]; | |
704 | } | |
705 | ||
706 | pool_data[index] = (void*)_Jv_makeUtf8Const (buffer, len); | |
707 | pool_tags[index] = JV_CONSTANT_Utf8; | |
708 | } | |
709 | break; | |
710 | ||
711 | case JV_CONSTANT_Class: | |
712 | { | |
713 | int utf_index = get2u (this_data); | |
714 | check_tag (utf_index, JV_CONSTANT_Utf8); | |
715 | prepare_pool_entry (utf_index, JV_CONSTANT_Utf8); | |
716 | ||
717 | if (verify) | |
718 | _Jv_VerifyClassName ((_Jv_Utf8Const*)pool_data[utf_index]); | |
719 | ||
720 | pool_data[index] = pool_data[utf_index]; | |
721 | pool_tags[index] = JV_CONSTANT_Class; | |
722 | } | |
723 | break; | |
724 | ||
725 | case JV_CONSTANT_String: | |
726 | // already handled before... | |
727 | break; | |
728 | ||
729 | case JV_CONSTANT_Fieldref: | |
730 | case JV_CONSTANT_Methodref: | |
731 | case JV_CONSTANT_InterfaceMethodref: | |
732 | { | |
733 | int class_index = get2u (this_data); | |
734 | int nat_index = get2u (this_data+2); | |
735 | ||
736 | check_tag (class_index, JV_CONSTANT_Class); | |
737 | prepare_pool_entry (class_index, JV_CONSTANT_Class); | |
738 | ||
739 | check_tag (nat_index, JV_CONSTANT_NameAndType); | |
740 | prepare_pool_entry (nat_index, JV_CONSTANT_NameAndType); | |
741 | ||
742 | // here, verify the signature and identifier name | |
743 | if (verify) | |
744 | { | |
745 | _Jv_ushort name_index, type_index; | |
746 | _Jv_loadIndexes ((const void**)&pool_data[nat_index], | |
747 | name_index, type_index); | |
748 | ||
749 | if (this_tag == JV_CONSTANT_Fieldref) | |
750 | _Jv_VerifyFieldSignature | |
751 | ((_Jv_Utf8Const*)pool_data[type_index]); | |
752 | else | |
753 | _Jv_VerifyMethodSignature | |
754 | ((_Jv_Utf8Const*)pool_data[type_index]); | |
755 | ||
756 | _Jv_Utf8Const* name = (_Jv_Utf8Const*)pool_data[name_index]; | |
757 | ||
758 | if (this_tag != JV_CONSTANT_Fieldref | |
759 | && ( _Jv_equalUtf8Consts (name, clinit_name) | |
760 | || _Jv_equalUtf8Consts (name, init_name))) | |
761 | /* ignore */; | |
762 | else | |
763 | _Jv_VerifyIdentifier ((_Jv_Utf8Const*)pool_data[name_index]); | |
764 | } | |
765 | ||
766 | _Jv_storeIndexes (&pool_data[index], class_index, nat_index); | |
767 | pool_tags[index] = this_tag; | |
768 | } | |
769 | break; | |
770 | ||
771 | case JV_CONSTANT_NameAndType: | |
772 | { | |
773 | _Jv_ushort name_index = get2u (this_data); | |
774 | _Jv_ushort type_index = get2u (this_data+2); | |
775 | ||
776 | check_tag (name_index, JV_CONSTANT_Utf8); | |
777 | prepare_pool_entry (name_index, JV_CONSTANT_Utf8); | |
778 | ||
779 | check_tag (type_index, JV_CONSTANT_Utf8); | |
780 | prepare_pool_entry (type_index, JV_CONSTANT_Utf8); | |
781 | ||
782 | _Jv_storeIndexes (&pool_data[index], name_index, type_index); | |
783 | pool_tags[index] = JV_CONSTANT_NameAndType; | |
784 | } | |
785 | break; | |
786 | ||
787 | case JV_CONSTANT_Float: | |
788 | { | |
789 | jfloat f = int_bits_to_float ((jint) get4 (this_data)); | |
790 | _Jv_storeFloat (&pool_data[index], f); | |
791 | pool_tags[index] = JV_CONSTANT_Float; | |
792 | } | |
793 | break; | |
794 | ||
795 | case JV_CONSTANT_Integer: | |
796 | { | |
797 | int i = get4 (this_data); | |
798 | _Jv_storeInt (&pool_data[index], i); | |
799 | pool_tags[index] = JV_CONSTANT_Integer; | |
800 | } | |
801 | break; | |
802 | ||
803 | case JV_CONSTANT_Double: | |
804 | { | |
805 | jdouble d = long_bits_to_double ((jlong) get8 (this_data)); | |
806 | _Jv_storeDouble (&pool_data[index], d); | |
807 | pool_tags[index] = JV_CONSTANT_Double; | |
808 | } | |
809 | break; | |
810 | ||
811 | case JV_CONSTANT_Long: | |
812 | { | |
813 | jlong i = get8 (this_data); | |
814 | _Jv_storeLong (&pool_data[index], i); | |
815 | pool_tags[index] = JV_CONSTANT_Long; | |
816 | } | |
817 | break; | |
818 | ||
819 | default: | |
820 | throw_class_format_error ("erroneous constant pool tag"); | |
821 | } | |
822 | } | |
823 | ||
824 | ||
825 | void | |
826 | _Jv_ClassReader::handleClassBegin | |
827 | (int access_flags, int this_class, int super_class) | |
828 | { | |
829 | unsigned char *pool_tags = (unsigned char*) def->constants.tags; | |
830 | void **pool_data = (void**) def->constants.data; | |
831 | ||
832 | check_tag (this_class, JV_CONSTANT_Class); | |
833 | _Jv_Utf8Const *loadedName = (_Jv_Utf8Const*)pool_data[this_class]; | |
834 | ||
835 | // was ClassLoader.defineClass called with an expected class name? | |
836 | if (def->name == 0) | |
837 | { | |
838 | jclass orig = _Jv_FindClassInCache (loadedName, def->loader); | |
839 | ||
840 | if (orig == 0) | |
841 | { | |
842 | def->name = loadedName; | |
843 | } | |
844 | else | |
845 | { | |
846 | jstring msg = JvNewStringUTF ("anonymous " | |
847 | "class data denotes " | |
848 | "existing class "); | |
849 | msg = msg->concat (orig->getName ()); | |
850 | ||
851 | throw_no_class_def_found_error (msg); | |
852 | } | |
853 | } | |
854 | ||
855 | // assert that the loaded class has the expected name, 5.3.5 | |
856 | else if (! _Jv_equalUtf8Consts (loadedName, def->name)) | |
857 | { | |
858 | jstring msg = JvNewStringUTF ("loaded class "); | |
859 | msg = msg->concat (def->getName ()); | |
860 | msg = msg->concat (_Jv_NewStringUTF (" was in fact named ")); | |
861 | jstring klass_name = _Jv_NewStringUTF (loadedName->data); | |
862 | msg = msg->concat (klass_name); | |
863 | ||
864 | throw_no_class_def_found_error (msg); | |
865 | } | |
866 | ||
867 | def->accflags = access_flags; | |
868 | pool_data[this_class] = (void*)def; | |
869 | pool_tags[this_class] = JV_CONSTANT_ResolvedClass; | |
870 | ||
871 | if (super_class == 0) | |
872 | { | |
873 | // interfaces have java.lang.Object as super. | |
874 | if (access_flags & INTERFACE) | |
875 | { | |
876 | def->superclass = (jclass)&ClassObject; | |
877 | } | |
878 | ||
879 | // FIXME: Consider this carefully! | |
880 | else if (!_Jv_equalUtf8Consts (def->name, ClassObject.name)) | |
881 | { | |
882 | throw_no_class_def_found_error ("loading java.lang.Object"); | |
883 | } | |
884 | } | |
885 | ||
886 | // In the pre-loading state, it can be looked up in the | |
887 | // cache only by this thread! This allows the super-class | |
888 | // to include references to this class. | |
889 | ||
890 | def->state = JV_STATE_PRELOADING; | |
891 | _Jv_RegisterClass (def); | |
892 | ||
893 | if (super_class != 0) | |
894 | { | |
895 | // load the super class | |
896 | check_tag (super_class, JV_CONSTANT_Class); | |
897 | _Jv_Utf8Const* super_name = | |
898 | (_Jv_Utf8Const*)pool_data[super_class]; | |
899 | ||
900 | // load the super class using our defining loader | |
901 | jclass the_super = _Jv_FindClass (super_name, | |
902 | def->loader); | |
903 | ||
904 | // This will establish that we are allowed to be a subclass, | |
905 | // and check for class circularity error | |
906 | checkExtends (def, the_super); | |
907 | ||
908 | def->superclass = the_super; | |
909 | pool_data[super_class] = (void*) the_super; | |
910 | pool_tags[super_class] = JV_CONSTANT_ResolvedClass; | |
911 | } | |
912 | ||
913 | // now we've come past the circularity problem, we can | |
914 | // now say that we're loading... | |
915 | ||
916 | def->state = JV_STATE_LOADING; | |
917 | def->notifyAll (); | |
918 | } | |
919 | ||
920 | ///// implements the checks described in sect. 5.3.5.3 | |
921 | void | |
922 | _Jv_ClassReader::checkExtends (jclass sub, jclass super) | |
923 | { | |
924 | // having an interface or a final class as a superclass is no good | |
925 | if ((super->accflags & (INTERFACE | FINAL)) != 0) | |
926 | { | |
927 | throw_incompatible_class_change_error (sub->getName ()); | |
928 | } | |
929 | ||
930 | // if the super class is not public, we need to check some more | |
931 | if ((super->accflags & PUBLIC) == 0) | |
932 | { | |
933 | // With package scope, the classes must have the same | |
934 | // class loader. | |
935 | if ( sub->loader != super->loader | |
936 | || !_Jv_ClassNameSamePackage (sub->name, super->name)) | |
937 | { | |
938 | throw_incompatible_class_change_error (sub->getName ()); | |
939 | } | |
940 | } | |
941 | ||
942 | for (; super != 0; super = super->superclass) | |
943 | { | |
944 | if (super == sub) | |
945 | throw_class_circularity_error (sub->getName ()); | |
946 | } | |
947 | } | |
948 | ||
949 | ||
950 | ||
951 | void _Jv_ClassReader::handleInterfacesBegin (int count) | |
952 | { | |
953 | def->interfaces = (jclass*) _Jv_AllocBytesChecked (count*sizeof (jclass)); | |
954 | def->interface_count = count; | |
955 | } | |
956 | ||
957 | void _Jv_ClassReader::handleInterface (int if_number, int offset) | |
958 | { | |
959 | void ** pool_data = def->constants.data; | |
960 | unsigned char * pool_tags = (unsigned char*) def->constants.tags; | |
961 | ||
962 | jclass the_interface; | |
963 | ||
964 | if (pool_tags[offset] == JV_CONSTANT_Class) | |
965 | { | |
966 | _Jv_Utf8Const* name = (_Jv_Utf8Const*) pool_data[offset]; | |
967 | the_interface = _Jv_FindClass (name, def->loader); | |
968 | } | |
969 | else if (pool_tags[offset] == JV_CONSTANT_ResolvedClass) | |
970 | { | |
971 | the_interface = (jclass)pool_data[offset]; | |
972 | } | |
973 | else | |
974 | { | |
975 | throw_no_class_def_found_error ("erroneous constant pool tag"); | |
976 | } | |
977 | ||
978 | // checks the validity of the_interface, and that we are in fact | |
979 | // allowed to implement that interface. | |
980 | checkImplements (def, the_interface); | |
981 | ||
982 | pool_data[offset] = (void*)the_interface; | |
983 | pool_tags[offset] = JV_CONSTANT_ResolvedClass; | |
984 | ||
985 | def->interfaces[if_number] = the_interface; | |
986 | } | |
987 | ||
988 | void | |
989 | _Jv_ClassReader::checkImplements (jclass sub, jclass super) | |
990 | { | |
991 | // well, it *must* be an interface | |
992 | if ((super->accflags & INTERFACE) == 0) | |
993 | { | |
994 | throw_incompatible_class_change_error (sub->getName ()); | |
995 | } | |
996 | ||
997 | // if it has package scope, it must also be defined by the | |
998 | // same loader. | |
999 | if ((super->accflags & PUBLIC) == 0) | |
1000 | { | |
1001 | if ( sub->loader != super->loader | |
1002 | || !_Jv_ClassNameSamePackage (sub->name, super->name)) | |
1003 | { | |
1004 | throw_incompatible_class_change_error (sub->getName ()); | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | // FIXME: add interface circularity check here | |
1009 | if (sub == super) | |
1010 | { | |
1011 | throw_class_circularity_error (sub->getName ()); | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | void _Jv_ClassReader::handleFieldsBegin (int count) | |
1016 | { | |
1017 | def->fields = (_Jv_Field*) | |
1018 | _Jv_AllocBytesChecked (count * sizeof (_Jv_Field)); | |
1019 | def->field_count = count; | |
1020 | def->field_initializers = (_Jv_ushort*) | |
1021 | _Jv_AllocBytesChecked (count * sizeof (_Jv_ushort)); | |
1022 | for (int i = 0; i < count; i++) | |
1023 | def->field_initializers[i] = (_Jv_ushort) 0; | |
1024 | } | |
1025 | ||
1026 | void _Jv_ClassReader::handleField (int field_no, | |
1027 | int flags, | |
1028 | int name, | |
1029 | int desc) | |
1030 | { | |
1031 | void **const pool_data = def->constants.data; | |
1032 | ||
1033 | _Jv_Field *field = &def->fields[field_no]; | |
1034 | _Jv_Utf8Const *field_name = (_Jv_Utf8Const*) pool_data[name]; | |
1035 | ||
1036 | #ifndef COMPACT_FIELDS | |
1037 | field->name = field_name; | |
1038 | #else | |
1039 | field->nameIndex = name; | |
1040 | #endif | |
1041 | ||
1042 | if (verify) | |
1043 | _Jv_VerifyIdentifier (field_name); | |
1044 | ||
1045 | // ignore flags we don't know about. | |
1046 | field->flags = flags & ALL_FLAGS; | |
1047 | ||
1048 | if (verify) | |
1049 | { | |
1050 | if (field->flags & (SYNCHRONIZED|NATIVE|INTERFACE|ABSTRACT)) | |
1051 | throw_class_format_error ("erroneous field access flags"); | |
1052 | ||
1053 | if (1 < ( ((field->flags & PUBLIC) ? 1 : 0) | |
1054 | +((field->flags & PRIVATE) ? 1 : 0) | |
1055 | +((field->flags & PROTECTED) ? 1 : 0))) | |
1056 | throw_class_format_error ("erroneous field access flags"); | |
1057 | } | |
1058 | ||
1059 | _Jv_Utf8Const* sig = (_Jv_Utf8Const*) pool_data[desc]; | |
1060 | ||
1061 | if (verify) | |
1062 | _Jv_VerifyFieldSignature (sig); | |
1063 | ||
1064 | // field->type is really a jclass, but while it is still | |
1065 | // unresolved we keep an _Jv_Utf8Const* instead. | |
1066 | field->type = (jclass) sig; | |
1067 | field->flags |= _Jv_FIELD_UNRESOLVED_FLAG; | |
1068 | field->u.boffset = 0; | |
1069 | } | |
1070 | ||
1071 | ||
1072 | void _Jv_ClassReader::handleConstantValueAttribute (int field_index, | |
1073 | int value) | |
1074 | { | |
1075 | _Jv_Field *field = &def->fields[field_index]; | |
1076 | ||
1077 | if ((field->flags & (STATIC|FINAL|PRIVATE)) == 0) | |
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 | { | |
1100 | // We need to reorganize the fields so that the static ones are first, | |
1101 | // to conform to GCJ class layout. | |
1102 | ||
1103 | int low = 0; | |
1104 | int high = def->field_count-1; | |
1105 | _Jv_Field *fields = def->fields; | |
1106 | _Jv_ushort *inits = def->field_initializers; | |
1107 | ||
1108 | // this is kind of a raw version of quicksort. | |
1109 | while (low < high) | |
1110 | { | |
1111 | // go forward on low, while it's a static | |
1112 | while (low < high && (fields[low].flags & STATIC) != 0) | |
1113 | low++; | |
1114 | ||
1115 | // go backwards on high, while it's a non-static | |
1116 | while (low < high && (fields[high].flags & STATIC) == 0) | |
1117 | high--; | |
1118 | ||
1119 | if (low==high) | |
1120 | break; | |
1121 | ||
1122 | _Jv_Field tmp = fields[low]; | |
1123 | _Jv_ushort itmp = inits[low]; | |
1124 | ||
1125 | fields[low] = fields[high]; | |
1126 | inits[low] = inits[high]; | |
1127 | ||
1128 | fields[high] = tmp; | |
1129 | inits[high] = itmp; | |
1130 | ||
1131 | high -= 1; | |
1132 | low += 1; | |
1133 | } | |
1134 | ||
1135 | if ((fields[low].flags & STATIC) != 0) | |
1136 | low += 1; | |
1137 | ||
1138 | def->static_field_count = low; | |
1139 | } | |
1140 | ||
1141 | ||
1142 | ||
1143 | void _Jv_ClassReader::handleMethodsBegin (int count) | |
1144 | { | |
1145 | def->methods = (_Jv_Method*) | |
1146 | _Jv_AllocBytesChecked (sizeof (_Jv_Method)*count); | |
1147 | ||
1148 | def->interpreted_methods = (_Jv_InterpMethod**) | |
1149 | _Jv_AllocBytesChecked (sizeof (_Jv_InterpMethod*) * count); | |
1150 | ||
1151 | for (int i = 0; i < count; i++) | |
1152 | def->interpreted_methods[i] = 0; | |
1153 | ||
1154 | def->method_count = count; | |
1155 | } | |
1156 | ||
1157 | ||
1158 | void _Jv_ClassReader::handleMethod | |
1159 | (int mth_index, int accflags, int name, int desc) | |
1160 | { | |
1161 | void **const pool_data = def->constants.data; | |
1162 | _Jv_Method *method = &def->methods[mth_index]; | |
1163 | ||
1164 | check_tag (name, JV_CONSTANT_Utf8); | |
1165 | prepare_pool_entry (name, JV_CONSTANT_Utf8); | |
1166 | method->name = (_Jv_Utf8Const*)pool_data[name]; | |
1167 | ||
1168 | check_tag (desc, JV_CONSTANT_Utf8); | |
1169 | prepare_pool_entry (desc, JV_CONSTANT_Utf8); | |
1170 | method->signature = (_Jv_Utf8Const*)pool_data[desc]; | |
1171 | ||
1172 | // ignore unknown flags | |
1173 | method->accflags = accflags & ALL_FLAGS; | |
1174 | ||
1175 | // intialize... | |
1176 | method->ncode = 0; | |
1177 | ||
1178 | if (verify) | |
1179 | { | |
1180 | if (_Jv_equalUtf8Consts (method->name, clinit_name) | |
1181 | || _Jv_equalUtf8Consts (method->name, init_name)) | |
1182 | /* ignore */; | |
1183 | else | |
1184 | _Jv_VerifyIdentifier (method->name); | |
1185 | ||
1186 | _Jv_VerifyMethodSignature (method->signature); | |
1187 | ||
1188 | if (method->accflags & (VOLATILE|TRANSIENT|INTERFACE)) | |
1189 | throw_class_format_error ("erroneous method access flags"); | |
1190 | ||
1191 | if (1 < ( ((method->accflags & PUBLIC) ? 1 : 0) | |
1192 | +((method->accflags & PRIVATE) ? 1 : 0) | |
1193 | +((method->accflags & PROTECTED) ? 1 : 0))) | |
1194 | throw_class_format_error ("erroneous method access flags"); | |
1195 | } | |
1196 | } | |
1197 | ||
1198 | void _Jv_ClassReader::handleCodeAttribute | |
1199 | (int method_index, int max_stack, int max_locals, | |
1200 | int code_start, int code_length, int exc_table_length) | |
1201 | { | |
1202 | int size = _Jv_InterpMethod::size (exc_table_length, code_length); | |
1203 | _Jv_InterpMethod *method = | |
1204 | (_Jv_InterpMethod*) (_Jv_AllocBytesChecked (size)); | |
1205 | ||
1206 | method->max_stack = max_stack; | |
1207 | method->max_locals = max_locals; | |
1208 | method->code_length = code_length; | |
1209 | method->exc_count = exc_table_length; | |
1210 | method->defining_class = def; | |
1211 | method->self = &def->methods[method_index]; | |
1212 | ||
1213 | // grab the byte code! | |
1214 | memcpy ((void*) method->bytecode (), | |
1215 | (void*) (bytes+code_start), | |
1216 | code_length); | |
1217 | ||
1218 | def->interpreted_methods[method_index] = method; | |
1219 | ||
1220 | /* that's all we do for now */ | |
1221 | } | |
1222 | ||
1223 | void _Jv_ClassReader::handleExceptionTableEntry | |
1224 | (int method_index, int exc_index, | |
1225 | int start_pc, int end_pc, int handler_pc, int catch_type) | |
1226 | { | |
1227 | _Jv_InterpMethod *method = def->interpreted_methods[method_index]; | |
1228 | _Jv_InterpException *exc = method->exceptions (); | |
1229 | ||
1230 | exc[exc_index].start_pc = start_pc; | |
1231 | exc[exc_index].end_pc = end_pc; | |
1232 | exc[exc_index].handler_pc = handler_pc; | |
1233 | exc[exc_index].handler_type = catch_type; | |
1234 | } | |
1235 | ||
1236 | void _Jv_ClassReader::handleMethodsEnd () | |
1237 | { | |
1238 | for (int i = 0; i < def->method_count; i++) | |
1239 | { | |
1240 | _Jv_Method *method = &def->methods[i]; | |
1241 | if (method->accflags & (NATIVE|ABSTRACT)) | |
1242 | { | |
1243 | if (def->interpreted_methods[i] != 0) | |
1244 | throw_class_format_error ("code provided " | |
1245 | "for abstract or native method"); | |
1246 | } | |
1247 | else | |
1248 | { | |
1249 | if (def->interpreted_methods[i] == 0) | |
1250 | throw_class_format_error ("abstract or native method " | |
1251 | "with no code"); | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | } | |
1256 | ||
1257 | \f | |
1258 | /** This section takes care of verifying integrity of identifiers, | |
1259 | signatures, field ddescriptors, and class names */ | |
1260 | ||
1261 | #define UTF8_PEEK(PTR, LIMIT) \ | |
1262 | ({ unsigned char* xxkeep = (PTR); \ | |
1263 | int xxch = UTF8_GET(PTR,LIMIT); \ | |
1264 | PTR = xxkeep; xxch; }) | |
1265 | ||
1266 | /* verify one element of a type descriptor or signature */ | |
1267 | static unsigned char* | |
1268 | _Jv_VerifyOne (unsigned char* ptr, unsigned char* limit, bool void_ok) | |
1269 | { | |
1270 | if (ptr >= limit) | |
1271 | return 0; | |
1272 | ||
1273 | int ch = UTF8_GET (ptr, limit); | |
1274 | ||
1275 | switch (ch) | |
1276 | { | |
1277 | case 'V': | |
1278 | if (! void_ok) return 0; | |
1279 | ||
1280 | case 'S': case 'B': case 'I': case 'J': | |
1281 | case 'Z': case 'C': case 'F': case 'D': | |
1282 | break; | |
1283 | ||
1284 | case 'L': | |
1285 | { | |
1286 | unsigned char *start = ptr, *end; | |
1287 | do { | |
1288 | if (ptr > limit) | |
1289 | return 0; | |
1290 | ||
1291 | end = ptr; | |
1292 | ||
1293 | if ((ch = UTF8_GET (ptr, limit)) == -1) | |
1294 | return 0; | |
1295 | ||
1296 | } while (ch != ';'); | |
1297 | _Jv_VerifyClassName (start, (unsigned short) (end-start)); | |
1298 | } | |
1299 | break; | |
1300 | ||
1301 | case '[': | |
1302 | return _Jv_VerifyOne (ptr, limit, false); | |
1303 | break; | |
1304 | ||
1305 | default: | |
1306 | return 0; | |
1307 | } | |
1308 | ||
1309 | return ptr; | |
1310 | ||
1311 | } | |
1312 | ||
1313 | ||
1314 | /** verification and loading procedures **/ | |
1315 | ||
1316 | void | |
1317 | _Jv_VerifyFieldSignature (_Jv_Utf8Const*sig) | |
1318 | { | |
1319 | unsigned char* ptr = (unsigned char*) sig->data; | |
1320 | unsigned char* limit = ptr + sig->length; | |
1321 | ||
1322 | ptr = _Jv_VerifyOne (ptr, limit, false); | |
1323 | ||
1324 | if (ptr != limit) | |
1325 | throw_class_format_error ("erroneous type descriptor"); | |
1326 | } | |
1327 | ||
1328 | void | |
1329 | _Jv_VerifyMethodSignature (_Jv_Utf8Const*sig) | |
1330 | { | |
1331 | unsigned char* ptr = (unsigned char*) sig->data; | |
1332 | unsigned char* limit = ptr + sig->length; | |
1333 | ||
1334 | if (ptr == limit) | |
1335 | throw_class_format_error ("erroneous type descriptor"); | |
1336 | ||
1337 | if (UTF8_GET(ptr,limit) != '(') | |
1338 | throw_class_format_error ("erroneous type descriptor"); | |
1339 | ||
1340 | while (ptr && UTF8_PEEK (ptr, limit) != ')') | |
1341 | ptr = _Jv_VerifyOne (ptr, limit, false); | |
1342 | ||
1343 | if (UTF8_GET (ptr, limit) != ')') | |
1344 | throw_class_format_error ("erroneous type descriptor"); | |
1345 | ||
1346 | // get the return type | |
1347 | ptr = _Jv_VerifyOne (ptr, limit, true); | |
1348 | ||
1349 | if (ptr != limit) | |
1350 | throw_class_format_error ("erroneous type descriptor"); | |
1351 | ||
1352 | return; | |
1353 | ||
1354 | } | |
1355 | ||
1356 | /* we try to avoid calling the Character methods all the time, | |
1357 | in fact, they will only be called for non-standard things */ | |
1358 | ||
1359 | static __inline__ int | |
1360 | is_identifier_start (int c) | |
1361 | { | |
1362 | unsigned int ch = (unsigned)c; | |
1363 | ||
1364 | if ((ch - 0x41U) < 29U) /* A ... Z */ | |
1365 | return 1; | |
1366 | if ((ch - 0x61U) < 29U) /* a ... z */ | |
1367 | return 1; | |
1368 | if (ch == 0x5FU) /* _ */ | |
1369 | return 1; | |
1370 | ||
1371 | return character->isJavaIdentifierStart ((jchar) ch); | |
1372 | } | |
1373 | ||
1374 | static __inline__ int | |
1375 | is_identifier_part (int c) | |
1376 | { | |
1377 | unsigned int ch = (unsigned)c; | |
1378 | ||
1379 | if ((ch - 0x41U) < 29U) /* A ... Z */ | |
1380 | return 1; | |
1381 | if ((ch - 0x61U) < 29U) /* a ... z */ | |
1382 | return 1; | |
1383 | if ((ch - 0x30) < 10U) /* 0 .. 9 */ | |
1384 | return 1; | |
1385 | if (ch == 0x5FU || ch == 0x24U) /* _ $ */ | |
1386 | return 1; | |
1387 | ||
1388 | return character->isJavaIdentifierStart ((jchar) ch); | |
1389 | } | |
1390 | ||
1391 | void | |
1392 | _Jv_VerifyIdentifier (_Jv_Utf8Const* name) | |
1393 | { | |
1394 | unsigned char *ptr = (unsigned char*) name->data; | |
1395 | unsigned char *limit = ptr + name->length; | |
1396 | int ch; | |
1397 | ||
1398 | if ((ch = UTF8_GET (ptr, limit))==-1 | |
1399 | || ! is_identifier_start (ch)) | |
1400 | throw_class_format_error ("erroneous identifier"); | |
1401 | ||
1402 | while (ptr != limit) | |
1403 | { | |
1404 | if ((ch = UTF8_GET (ptr, limit))==-1 | |
1405 | || ! is_identifier_part (ch)) | |
1406 | throw_class_format_error ("erroneous identifier"); | |
1407 | } | |
1408 | } | |
1409 | ||
1410 | ||
1411 | void | |
1412 | _Jv_VerifyClassName (unsigned char* ptr, _Jv_ushort length) | |
1413 | { | |
1414 | unsigned char *limit = ptr+length; | |
1415 | int ch; | |
1416 | ||
1417 | next_level: | |
1418 | do { | |
1419 | if ((ch = UTF8_GET (ptr, limit))==-1) | |
1420 | throw_class_format_error ("erroneous class name"); | |
1421 | if (! is_identifier_start (ch)) | |
1422 | throw_class_format_error ("erroneous class name"); | |
1423 | do { | |
1424 | if (ptr == limit) | |
1425 | return; | |
1426 | else if ((ch = UTF8_GET (ptr, limit))==-1) | |
1427 | throw_class_format_error ("erroneous class name"); | |
1428 | else if (ch == '.') | |
1429 | goto next_level; | |
1430 | else if (! is_identifier_part (ch)) | |
1431 | throw_class_format_error ("erroneous class name"); | |
1432 | } while (true); | |
1433 | } while (true); | |
1434 | ||
1435 | } | |
1436 | ||
1437 | void | |
1438 | _Jv_VerifyClassName (_Jv_Utf8Const *name) | |
1439 | { | |
1440 | _Jv_VerifyClassName ((unsigned char*)&name->data[0], | |
1441 | (_Jv_ushort) name->length); | |
1442 | } | |
1443 | ||
1444 | ||
1445 | /** returns true, if name1 and name2 represents classes in the same | |
1446 | package. */ | |
1447 | ||
1448 | bool | |
1449 | _Jv_ClassNameSamePackage (_Jv_Utf8Const *name1, _Jv_Utf8Const *name2) | |
1450 | { | |
1451 | unsigned char* ptr1 = (unsigned char*) name1->data; | |
1452 | unsigned char* limit1 = ptr1 + name1->length; | |
1453 | ||
1454 | unsigned char* last1 = ptr1; | |
1455 | ||
1456 | // scan name1, and find the last occurrence of '.' | |
1457 | while (ptr1 < limit1) { | |
1458 | int ch1 = UTF8_GET (ptr1, limit1); | |
1459 | ||
1460 | if (ch1 == '.') | |
1461 | last1 = ptr1; | |
1462 | ||
1463 | else if (ch1 == -1) | |
1464 | return false; | |
1465 | } | |
1466 | ||
1467 | // now the length of name1's package name is len | |
1468 | int len = last1 - (unsigned char*) name1->data; | |
1469 | ||
1470 | // if this is longer than name2, then we're off | |
1471 | if (len > name2->length) | |
1472 | return false; | |
1473 | ||
1474 | // then compare the first len bytes for equality | |
1475 | if (memcmp ((void*) name1->data, (void*) name2->data, len) == 0) | |
1476 | { | |
1477 | // check that there are no .'s after position len in name2 | |
1478 | ||
1479 | unsigned char* ptr2 = (unsigned char*) name2->data + len; | |
1480 | unsigned char* limit2 = | |
1481 | (unsigned char*) name2->data + name2->length; | |
1482 | ||
1483 | while (ptr2 < limit2) | |
1484 | { | |
1485 | int ch2 = UTF8_GET (ptr2, limit2); | |
1486 | if (ch2 == -1 || ch2 == '.') | |
1487 | return false; | |
1488 | } | |
1489 | return true; | |
1490 | } | |
1491 | return false; | |
1492 | } | |
1493 | ||
1494 | ||
1495 | \f | |
1496 | /** Here we define the exceptions that can be thrown */ | |
1497 | ||
1498 | static void | |
1499 | throw_no_class_def_found_error (jstring msg) | |
1500 | { | |
1501 | if (msg == 0) | |
1502 | JvThrow (new java::lang::NoClassDefFoundError); | |
1503 | else | |
1504 | JvThrow (new java::lang::NoClassDefFoundError (msg)); | |
1505 | } | |
1506 | ||
1507 | static void | |
1508 | throw_no_class_def_found_error (char *msg) | |
1509 | { | |
1510 | throw_no_class_def_found_error (JvNewStringLatin1 (msg)); | |
1511 | } | |
1512 | ||
1513 | static void | |
1514 | throw_class_format_error (jstring msg) | |
1515 | { | |
1516 | if (msg == 0) | |
1517 | JvThrow (new java::lang::ClassFormatError); | |
1518 | else | |
1519 | JvThrow (new java::lang::ClassFormatError (msg)); | |
1520 | } | |
1521 | ||
1522 | static void | |
1523 | throw_class_format_error (char *msg) | |
1524 | { | |
1525 | throw_class_format_error (JvNewStringLatin1 (msg)); | |
1526 | } | |
1527 | ||
1528 | static void | |
1529 | throw_internal_error (char *msg) | |
1530 | { | |
1531 | JvThrow | |
1532 | (new java::lang::InternalError (JvNewStringLatin1 (msg))); | |
1533 | } | |
1534 | ||
1535 | static jfloat int_bits_to_float (jint value) | |
1536 | { | |
1537 | return java::lang::Float::intBitsToFloat (value); | |
1538 | } | |
1539 | ||
1540 | static jdouble long_bits_to_double (jlong value) | |
1541 | { | |
1542 | return java::lang::Double::longBitsToDouble (value); | |
1543 | } | |
1544 | ||
1545 | static void throw_incompatible_class_change_error (jstring msg) | |
1546 | { | |
1547 | JvThrow (new java::lang::IncompatibleClassChangeError (msg)); | |
1548 | } | |
1549 | ||
1550 | static void throw_class_circularity_error (jstring msg) | |
1551 | { | |
1552 | JvThrow (new java::lang::ClassCircularityError (msg)); | |
1553 | } | |
1554 | ||
1555 | #endif /* INTERPRETER */ | |
1556 |