]>
Commit | Line | Data |
---|---|---|
58eb6e7c AG |
1 | // defineclass.cc - defining a class from .class format. |
2 | ||
b3208f56 | 3 | /* Copyright (C) 1999, 2000, 2001 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 | ||
a9770f9a | 25 | #include <stdlib.h> |
58eb6e7c | 26 | #include <java-cpool.h> |
27e934d8 | 27 | #include <gcj/cni.h> |
58eb6e7c AG |
28 | |
29 | #include <java/lang/Class.h> | |
30 | #include <java/lang/Float.h> | |
31 | #include <java/lang/Double.h> | |
32 | #include <java/lang/Character.h> | |
33 | #include <java/lang/LinkageError.h> | |
34 | #include <java/lang/InternalError.h> | |
35 | #include <java/lang/ClassFormatError.h> | |
36 | #include <java/lang/NoClassDefFoundError.h> | |
37 | #include <java/lang/ClassCircularityError.h> | |
38 | #include <java/lang/ClassNotFoundException.h> | |
39 | #include <java/lang/IncompatibleClassChangeError.h> | |
e409a2c8 | 40 | #include <java/lang/reflect/Modifier.h> |
58eb6e7c | 41 | |
107abb2f | 42 | using namespace gcj; |
58eb6e7c | 43 | |
bea31ffb TT |
44 | #ifdef INTERPRETER |
45 | ||
cc712abf | 46 | // these go in some separate functions, to avoid having _Jv_InitClass |
58eb6e7c AG |
47 | // inserted all over the place. |
48 | static void throw_internal_error (char *msg) | |
49 | __attribute__ ((__noreturn__)); | |
50 | static void throw_no_class_def_found_error (jstring msg) | |
51 | __attribute__ ((__noreturn__)); | |
52 | static void throw_no_class_def_found_error (char *msg) | |
53 | __attribute__ ((__noreturn__)); | |
54 | static void throw_class_format_error (jstring msg) | |
55 | __attribute__ ((__noreturn__)); | |
58eb6e7c AG |
56 | static void throw_incompatible_class_change_error (jstring msg) |
57 | __attribute__ ((__noreturn__)); | |
58 | static void throw_class_circularity_error (jstring msg) | |
59 | __attribute__ ((__noreturn__)); | |
60 | ||
58eb6e7c AG |
61 | /** |
62 | * We define class reading using a class. It is practical, since then | |
63 | * the entire class-reader can be a friend of class Class (it needs to | |
64 | * write all it's different structures); but also because this makes it | |
65 | * easy to make class definition reentrant, and thus two threads can be | |
66 | * defining classes at the same time. This class (_Jv_ClassReader) is | |
67 | * never exposed outside this file, so we don't have to worry about | |
68 | * public or private members here. | |
69 | */ | |
70 | ||
71 | struct _Jv_ClassReader { | |
72 | ||
73 | // do verification? Currently, there is no option to disable this. | |
74 | // This flag just controls the verificaiton done by the class loader; | |
75 | // i.e., checking the integrity of the constant pool; and it is | |
76 | // allways on. You always want this as far as I can see, but it also | |
77 | // controls weither identifiers and type descriptors/signatures are | |
78 | // verified as legal. This could be somewhat more expensive since it | |
79 | // will call Characher.isJavaIdentifier{Start,Part} for each character | |
80 | // in any identifier (field name or method name) it comes by. Thus, | |
81 | // it might be useful to turn off this verification for classes that | |
82 | // come from a trusted source. However, for GCJ, trusted classes are | |
83 | // most likely to be linked in. | |
84 | ||
85 | bool verify; | |
86 | ||
87 | // input data. | |
88 | unsigned char *bytes; | |
89 | int len; | |
90 | ||
91 | // current input position | |
92 | int pos; | |
93 | ||
94 | // the constant pool data | |
95 | int pool_count; | |
96 | unsigned char *tags; | |
97 | unsigned int *offsets; | |
98 | ||
99 | // the class to define (see java-interp.h) | |
100 | _Jv_InterpClass *def; | |
101 | ||
102 | /* check that the given number of input bytes are available */ | |
103 | inline void check (int num) | |
104 | { | |
105 | if (pos + num > len) | |
106 | throw_class_format_error ("Premature end of data"); | |
107 | } | |
108 | ||
109 | /* skip a given number of bytes in input */ | |
110 | inline void skip (int num) | |
111 | { | |
112 | check (num); | |
113 | pos += num; | |
114 | } | |
115 | ||
116 | /* read an unsignend 1-byte unit */ | |
117 | inline static jint get1u (unsigned char* bytes) | |
118 | { | |
119 | return bytes[0]; | |
120 | } | |
121 | ||
122 | /* read an unsigned 1-byte unit */ | |
123 | inline jint read1u () | |
124 | { | |
125 | skip (1); | |
126 | return get1u (bytes+pos-1); | |
127 | } | |
128 | ||
129 | /* read an unsigned 2-byte unit */ | |
130 | inline static jint get2u (unsigned char *bytes) | |
131 | { | |
132 | return (((jint)bytes[0]) << 8) | ((jint)bytes[1]); | |
133 | } | |
134 | ||
135 | /* read an unsigned 2-byte unit */ | |
136 | inline jint read2u () | |
137 | { | |
138 | skip (2); | |
139 | return get2u (bytes+pos-2); | |
140 | } | |
141 | ||
142 | /* read a 4-byte unit */ | |
143 | static jint get4 (unsigned char *bytes) | |
144 | { | |
145 | return (((jint)bytes[0]) << 24) | |
146 | | (((jint)bytes[1]) << 16) | |
147 | | (((jint)bytes[2]) << 8) | |
148 | | (((jint)bytes[3]) << 0); | |
149 | } | |
150 | ||
151 | /* read a 4-byte unit, (we don't do that quite so often) */ | |
152 | inline jint read4 () | |
153 | { | |
154 | skip (4); | |
155 | return get4 (bytes+pos-4); | |
156 | } | |
157 | ||
158 | /* read a 8-byte unit */ | |
159 | static jlong get8 (unsigned char* bytes) | |
160 | { | |
161 | return (((jlong)bytes[0]) << 56) | |
162 | | (((jlong)bytes[1]) << 48) | |
163 | | (((jlong)bytes[2]) << 40) | |
164 | | (((jlong)bytes[3]) << 32) | |
165 | | (((jlong)bytes[4]) << 24) | |
166 | | (((jlong)bytes[5]) << 16) | |
167 | | (((jlong)bytes[6]) << 8) | |
168 | | (((jlong)bytes[7]) << 0); | |
169 | } | |
170 | ||
171 | /* read a 8-byte unit */ | |
172 | inline jlong read8 () | |
173 | { | |
174 | skip (8); | |
175 | return get8 (bytes+pos-8); | |
176 | } | |
177 | ||
178 | inline void check_tag (int index, char expected_tag) | |
179 | { | |
180 | if (index < 0 | |
181 | || index > pool_count | |
182 | || tags[index] != expected_tag) | |
183 | throw_class_format_error ("erroneous constant pool tag"); | |
184 | } | |
185 | ||
f9edddab PB |
186 | inline void verify_identifier (_Jv_Utf8Const* name) |
187 | { | |
188 | if (! _Jv_VerifyIdentifier (name)) | |
189 | throw_class_format_error ("erroneous identifier"); | |
190 | } | |
191 | ||
192 | inline void verify_classname (unsigned char* ptr, _Jv_ushort length) | |
193 | { | |
194 | if (! _Jv_VerifyClassName (ptr, length)) | |
195 | throw_class_format_error ("erroneous class name"); | |
196 | } | |
197 | ||
198 | inline void verify_classname (_Jv_Utf8Const *name) | |
199 | { | |
200 | if (! _Jv_VerifyClassName (name)) | |
201 | throw_class_format_error ("erroneous class name"); | |
202 | } | |
203 | ||
204 | inline void verify_field_signature (_Jv_Utf8Const *sig) | |
205 | { | |
206 | if (! _Jv_VerifyFieldSignature (sig)) | |
207 | throw_class_format_error ("erroneous type descriptor"); | |
208 | } | |
209 | ||
210 | inline void verify_method_signature (_Jv_Utf8Const *sig) | |
211 | { | |
212 | if (! _Jv_VerifyMethodSignature (sig)) | |
213 | throw_class_format_error ("erroneous type descriptor"); | |
214 | } | |
215 | ||
58eb6e7c AG |
216 | _Jv_ClassReader (jclass klass, jbyteArray data, jint offset, jint length) |
217 | { | |
218 | if (klass == 0 || length < 0 || offset+length > data->length) | |
219 | throw_internal_error ("arguments to _Jv_DefineClass"); | |
220 | ||
221 | verify = true; | |
222 | bytes = (unsigned char*) (elements (data)+offset); | |
223 | len = length; | |
224 | pos = 0; | |
225 | def = (_Jv_InterpClass*) klass; | |
226 | } | |
227 | ||
228 | /** and here goes the parser members defined out-of-line */ | |
229 | void parse (); | |
230 | void read_constpool (); | |
231 | void prepare_pool_entry (int index, unsigned char tag); | |
232 | void read_fields (); | |
233 | void read_methods (); | |
234 | void read_one_class_attribute (); | |
235 | void read_one_method_attribute (int method); | |
236 | void read_one_code_attribute (int method); | |
237 | void read_one_field_attribute (int field); | |
f9edddab | 238 | void throw_class_format_error (char *msg); |
58eb6e7c AG |
239 | |
240 | /** check an utf8 entry, without creating a Utf8Const object */ | |
241 | bool is_attribute_name (int index, char *name); | |
242 | ||
243 | /** here goes the class-loader members defined out-of-line */ | |
244 | void handleConstantPool (); | |
245 | void handleClassBegin (int, int, int); | |
246 | void handleInterfacesBegin (int); | |
247 | void handleInterface (int, int); | |
248 | void handleFieldsBegin (int); | |
249 | void handleField (int, int, int, int); | |
250 | void handleFieldsEnd (); | |
251 | void handleConstantValueAttribute (int,int); | |
252 | void handleMethodsBegin (int); | |
253 | void handleMethod (int, int, int, int); | |
254 | void handleMethodsEnd (); | |
255 | void handleCodeAttribute (int, int, int, int, int, int); | |
256 | void handleExceptionTableEntry (int, int, int, int, int, int); | |
257 | ||
258 | void checkExtends (jclass sub, jclass super); | |
259 | void checkImplements (jclass sub, jclass super); | |
260 | ||
261 | /* | |
262 | * FIXME: we should keep a hash table of utf8-strings, since many will | |
263 | * be the same. It's a little tricky, however, because the hash table | |
264 | * needs to interact gracefully with the garbage collector. Much | |
265 | * memory is to be saved by this, however! perhaps the improvement | |
266 | * could be implemented in prims.cc (_Jv_makeUtf8Const), since it | |
267 | * computes the hash value anyway. | |
268 | */ | |
58eb6e7c AG |
269 | }; |
270 | ||
58eb6e7c AG |
271 | void |
272 | _Jv_DefineClass (jclass klass, jbyteArray data, jint offset, jint length) | |
273 | { | |
58eb6e7c AG |
274 | _Jv_ClassReader reader (klass, data, offset, length); |
275 | reader.parse(); | |
276 | ||
277 | /* that's it! */ | |
278 | } | |
279 | ||
58eb6e7c AG |
280 | \f |
281 | /** This section defines the parsing/scanning of the class data */ | |
282 | ||
283 | void | |
284 | _Jv_ClassReader::parse () | |
285 | { | |
286 | int magic = read4 (); | |
287 | ||
288 | /* FIXME: Decide which range of version numbers to allow */ | |
289 | ||
290 | /* int minor_version = */ read2u (); | |
291 | /* int major_verson = */ read2u (); | |
292 | ||
293 | if (magic != (int) 0xCAFEBABE) | |
294 | throw_class_format_error ("bad magic number"); | |
295 | ||
296 | pool_count = read2u (); | |
297 | ||
298 | read_constpool (); | |
299 | ||
300 | int access_flags = read2u (); | |
301 | int this_class = read2u (); | |
302 | int super_class = read2u (); | |
303 | ||
304 | check_tag (this_class, JV_CONSTANT_Class); | |
305 | if (super_class != 0) | |
306 | check_tag (super_class, JV_CONSTANT_Class); | |
307 | ||
308 | handleClassBegin (access_flags, this_class, super_class); | |
309 | ||
310 | int interfaces_count = read2u (); | |
311 | ||
312 | handleInterfacesBegin (interfaces_count); | |
313 | ||
314 | for (int i = 0; i < interfaces_count; i++) | |
315 | { | |
316 | int iface = read2u (); | |
317 | check_tag (iface, JV_CONSTANT_Class); | |
318 | handleInterface (i, iface); | |
319 | } | |
320 | ||
321 | read_fields (); | |
322 | read_methods (); | |
323 | ||
324 | int attributes_count = read2u (); | |
325 | ||
326 | for (int i = 0; i < attributes_count; i++) | |
327 | { | |
328 | read_one_class_attribute (); | |
329 | } | |
330 | ||
331 | if (pos != len) | |
332 | throw_class_format_error ("unused data before end of file"); | |
333 | ||
334 | // tell everyone we're done. | |
335 | def->state = JV_STATE_LOADED; | |
336 | def->notifyAll (); | |
337 | ||
338 | } | |
339 | ||
340 | void _Jv_ClassReader::read_constpool () | |
341 | { | |
3610e0d5 TT |
342 | tags = (unsigned char*) _Jv_AllocBytes (pool_count); |
343 | offsets = (unsigned int *) _Jv_AllocBytes (sizeof (int) | |
58eb6e7c AG |
344 | * pool_count) ; |
345 | ||
346 | /** first, we scan the constant pool, collecting tags and offsets */ | |
347 | tags[0] = JV_CONSTANT_Undefined; | |
348 | offsets[0] = pos; | |
349 | for (int c = 1; c < pool_count; c++) | |
350 | { | |
351 | tags[c] = read1u (); | |
352 | offsets[c] = pos; | |
353 | ||
354 | switch (tags[c]) | |
355 | { | |
356 | case JV_CONSTANT_String: | |
357 | case JV_CONSTANT_Class: | |
358 | skip (2); | |
359 | break; | |
360 | ||
361 | case JV_CONSTANT_Fieldref: | |
362 | case JV_CONSTANT_Methodref: | |
363 | case JV_CONSTANT_InterfaceMethodref: | |
364 | case JV_CONSTANT_NameAndType: | |
365 | case JV_CONSTANT_Integer: | |
366 | case JV_CONSTANT_Float: | |
367 | skip (4); | |
368 | break; | |
369 | ||
370 | case JV_CONSTANT_Double: | |
371 | case JV_CONSTANT_Long: | |
372 | skip (8); | |
373 | tags[++c] = JV_CONSTANT_Undefined; | |
374 | break; | |
375 | ||
376 | case JV_CONSTANT_Utf8: | |
377 | { | |
378 | int len = read2u (); | |
379 | skip (len); | |
380 | } | |
381 | break; | |
382 | ||
383 | case JV_CONSTANT_Unicode: | |
384 | throw_class_format_error ("unicode not supported"); | |
385 | break; | |
386 | ||
387 | default: | |
388 | throw_class_format_error ("erroneous constant pool tag"); | |
389 | } | |
390 | } | |
391 | ||
392 | handleConstantPool (); | |
393 | } | |
394 | ||
395 | ||
396 | void _Jv_ClassReader::read_fields () | |
397 | { | |
398 | int fields_count = read2u (); | |
399 | handleFieldsBegin (fields_count); | |
400 | ||
401 | for (int i = 0; i < fields_count; i++) | |
402 | { | |
403 | int access_flags = read2u (); | |
404 | int name_index = read2u (); | |
405 | int descriptor_index = read2u (); | |
406 | int attributes_count = read2u (); | |
407 | ||
408 | check_tag (name_index, JV_CONSTANT_Utf8); | |
409 | prepare_pool_entry (name_index, JV_CONSTANT_Utf8); | |
410 | ||
411 | check_tag (descriptor_index, JV_CONSTANT_Utf8); | |
412 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
413 | ||
414 | handleField (i, access_flags, name_index, descriptor_index); | |
415 | ||
416 | for (int j = 0; j < attributes_count; j++) | |
417 | { | |
418 | read_one_field_attribute (i); | |
419 | } | |
420 | } | |
421 | ||
422 | handleFieldsEnd (); | |
423 | } | |
424 | ||
425 | bool | |
426 | _Jv_ClassReader::is_attribute_name (int index, char *name) | |
427 | { | |
428 | check_tag (index, JV_CONSTANT_Utf8); | |
429 | int len = get2u (bytes+offsets[index]); | |
430 | if (len != (int) strlen (name)) | |
431 | return false; | |
432 | else | |
433 | return !memcmp (bytes+offsets[index]+2, name, len); | |
434 | } | |
435 | ||
436 | void _Jv_ClassReader::read_one_field_attribute (int field_index) | |
437 | { | |
438 | int name = read2u (); | |
439 | int length = read4 (); | |
440 | ||
441 | if (is_attribute_name (name, "ConstantValue")) | |
442 | { | |
443 | int cv = read2u (); | |
444 | ||
445 | if (cv < pool_count | |
446 | && cv > 0 | |
447 | && (tags[cv] == JV_CONSTANT_Integer | |
448 | || tags[cv] == JV_CONSTANT_Float | |
449 | || tags[cv] == JV_CONSTANT_Long | |
450 | || tags[cv] == JV_CONSTANT_Double | |
451 | || tags[cv] == JV_CONSTANT_String)) | |
452 | { | |
453 | handleConstantValueAttribute (field_index, cv); | |
454 | } | |
455 | else | |
456 | { | |
457 | throw_class_format_error ("erroneous ConstantValue attribute"); | |
458 | } | |
459 | ||
460 | if (length != 2) | |
461 | throw_class_format_error ("erroneous ConstantValue attribute"); | |
462 | } | |
463 | ||
464 | else | |
465 | { | |
466 | skip (length); | |
467 | } | |
468 | } | |
469 | ||
470 | void _Jv_ClassReader::read_methods () | |
471 | { | |
472 | int methods_count = read2u (); | |
473 | ||
474 | handleMethodsBegin (methods_count); | |
475 | ||
476 | for (int i = 0; i < methods_count; i++) | |
477 | { | |
478 | int access_flags = read2u (); | |
479 | int name_index = read2u (); | |
480 | int descriptor_index = read2u (); | |
481 | int attributes_count = read2u (); | |
482 | ||
483 | check_tag (name_index, JV_CONSTANT_Utf8); | |
484 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
485 | ||
486 | check_tag (name_index, JV_CONSTANT_Utf8); | |
487 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
64d3a1b4 | 488 | |
58eb6e7c AG |
489 | handleMethod (i, access_flags, name_index, |
490 | descriptor_index); | |
64d3a1b4 | 491 | |
58eb6e7c AG |
492 | for (int j = 0; j < attributes_count; j++) |
493 | { | |
494 | read_one_method_attribute (i); | |
495 | } | |
496 | } | |
497 | ||
498 | handleMethodsEnd (); | |
499 | } | |
500 | ||
501 | void _Jv_ClassReader::read_one_method_attribute (int method_index) | |
502 | { | |
503 | int name = read2u (); | |
504 | int length = read4 (); | |
505 | ||
506 | if (is_attribute_name (name, "Exceptions")) | |
507 | { | |
224b7b7b TT |
508 | _Jv_Method *method = reinterpret_cast<_Jv_Method *> |
509 | (&def->methods[method_index]); | |
510 | if (method->throws != NULL) | |
511 | throw_class_format_error ("only one Exceptions attribute allowed per method"); | |
512 | ||
513 | int num_exceptions = read2u (); | |
514 | // We use malloc here because the GC won't scan the method | |
515 | // objects. FIXME this means a memory leak if we GC a class. | |
516 | // (Currently we never do.) | |
517 | _Jv_Utf8Const **exceptions = | |
518 | (_Jv_Utf8Const **) _Jv_Malloc ((num_exceptions + 1) * sizeof (_Jv_Utf8Const *)); | |
519 | ||
520 | int out = 0; | |
521 | _Jv_word *pool_data = def->constants.data; | |
522 | for (int i = 0; i < num_exceptions; ++i) | |
523 | { | |
524 | try | |
525 | { | |
526 | int ndx = read2u (); | |
527 | // JLS 2nd Ed. 4.7.5 requires that the tag not be 0. | |
528 | if (ndx != 0) | |
529 | { | |
530 | check_tag (ndx, JV_CONSTANT_Class); | |
531 | exceptions[out++] = pool_data[ndx].utf8; | |
532 | } | |
533 | } | |
534 | catch (java::lang::Throwable *exc) | |
535 | { | |
536 | _Jv_Free (exceptions); | |
537 | throw exc; | |
538 | } | |
539 | } | |
540 | exceptions[out] = NULL; | |
541 | method->throws = exceptions; | |
58eb6e7c | 542 | } |
224b7b7b | 543 | |
58eb6e7c AG |
544 | else if (is_attribute_name (name, "Code")) |
545 | { | |
546 | int start_off = pos; | |
547 | int max_stack = read2u (); | |
548 | int max_locals = read2u (); | |
549 | int code_length = read4 (); | |
550 | ||
551 | int code_start = pos; | |
552 | skip (code_length); | |
553 | int exception_table_length = read2u (); | |
554 | ||
555 | handleCodeAttribute (method_index, | |
556 | max_stack, max_locals, | |
557 | code_start, code_length, | |
558 | exception_table_length); | |
559 | ||
560 | ||
561 | for (int i = 0; i < exception_table_length; i++) | |
562 | { | |
563 | int start_pc = read2u (); | |
564 | int end_pc = read2u (); | |
565 | int handler_pc = read2u (); | |
566 | int catch_type = read2u (); | |
567 | ||
568 | if (start_pc > end_pc | |
569 | || start_pc < 0 | |
ef9f3bc4 TT |
570 | // END_PC can be equal to CODE_LENGTH. |
571 | // See JVM Spec 4.7.4. | |
572 | || end_pc > code_length | |
58eb6e7c AG |
573 | || handler_pc >= code_length) |
574 | throw_class_format_error ("erroneous exception handler info"); | |
575 | ||
576 | if (! (tags[catch_type] == JV_CONSTANT_Class | |
577 | || tags[catch_type] == 0)) | |
578 | { | |
579 | throw_class_format_error ("erroneous exception handler info"); | |
580 | } | |
581 | ||
582 | handleExceptionTableEntry (method_index, | |
583 | i, | |
584 | start_pc, | |
585 | end_pc, | |
586 | handler_pc, | |
587 | catch_type); | |
588 | ||
589 | } | |
590 | ||
591 | int attributes_count = read2u (); | |
592 | ||
593 | for (int i = 0; i < attributes_count; i++) | |
594 | { | |
595 | read_one_code_attribute (method_index); | |
596 | } | |
597 | ||
598 | if ((pos - start_off) != length) | |
599 | throw_class_format_error ("code attribute too short"); | |
600 | } | |
601 | ||
602 | else | |
603 | { | |
604 | /* ignore unknown attributes */ | |
605 | skip (length); | |
606 | } | |
607 | } | |
608 | ||
609 | void _Jv_ClassReader::read_one_code_attribute (int /*method*/) | |
610 | { | |
611 | /* ignore for now, ... later we may want to pick up | |
612 | line number information, for debugging purposes; | |
613 | in fact, the whole debugger issue is open! */ | |
614 | ||
615 | /* int name = */ read2u (); | |
616 | int length = read4 (); | |
617 | skip (length); | |
618 | ||
619 | } | |
620 | ||
621 | void _Jv_ClassReader::read_one_class_attribute () | |
622 | { | |
623 | /* we also ignore the class attributes, ... | |
624 | some day we'll add inner-classes support. */ | |
625 | ||
626 | /* int name = */ read2u (); | |
627 | int length = read4 (); | |
628 | skip (length); | |
629 | } | |
630 | ||
631 | ||
632 | ||
633 | \f | |
634 | /* this section defines the semantic actions of the parser */ | |
635 | ||
636 | void _Jv_ClassReader::handleConstantPool () | |
637 | { | |
638 | /** now, we actually define the class' constant pool */ | |
639 | ||
640 | // the pool is scanned explicitly by the collector | |
3610e0d5 | 641 | jbyte *pool_tags = (jbyte*) _Jv_AllocBytes (pool_count); |
7941ceab | 642 | _Jv_word *pool_data |
3610e0d5 | 643 | = (_Jv_word*) _Jv_AllocBytes (pool_count * sizeof (_Jv_word)); |
58eb6e7c AG |
644 | |
645 | def->constants.tags = pool_tags; | |
646 | def->constants.data = pool_data; | |
647 | def->constants.size = pool_count; | |
648 | ||
649 | // Here we make a pass to collect the strings! We do this, because | |
650 | // internally in the GCJ runtime, classes are encoded with .'s not /'s. | |
651 | // Therefore, we first collect the strings, and then translate the rest | |
652 | // of the utf8-entries (thus not representing strings) from /-notation | |
653 | // to .-notation. | |
654 | for (int i = 1; i < pool_count; i++) | |
655 | { | |
656 | if (tags[i] == JV_CONSTANT_String) | |
657 | { | |
658 | unsigned char* str_data = bytes + offsets [i]; | |
659 | int utf_index = get2u (str_data); | |
660 | check_tag (utf_index, JV_CONSTANT_Utf8); | |
661 | unsigned char *utf_data = bytes + offsets[utf_index]; | |
662 | int len = get2u (utf_data); | |
7941ceab | 663 | pool_data[i].utf8 = _Jv_makeUtf8Const ((char*)(utf_data+2), len); |
58eb6e7c AG |
664 | pool_tags[i] = JV_CONSTANT_String; |
665 | } | |
666 | else | |
667 | { | |
668 | pool_tags[i] = JV_CONSTANT_Undefined; | |
669 | } | |
670 | } | |
671 | ||
672 | // and now, we scan everything else but strings & utf8-entries. This | |
673 | // leaves out those utf8-entries which are not used; which will be left | |
674 | // with a tag of JV_CONSTANT_Undefined in the class definition. | |
675 | for (int index = 1; index < pool_count; index++) | |
676 | { | |
677 | switch (tags[index]) | |
678 | { | |
679 | case JV_CONSTANT_Undefined: | |
680 | case JV_CONSTANT_String: | |
681 | case JV_CONSTANT_Utf8: | |
682 | continue; | |
683 | ||
684 | default: | |
685 | prepare_pool_entry (index, tags[index]); | |
686 | } | |
687 | } | |
688 | ||
689 | } | |
690 | ||
691 | /* this is a recursive procedure, which will prepare pool entries as needed. | |
692 | Which is how we avoid initializing those entries which go unused. */ | |
693 | void | |
694 | _Jv_ClassReader::prepare_pool_entry (int index, unsigned char this_tag) | |
695 | { | |
696 | /* these two, pool_data and pool_tags, point into the class | |
697 | structure we are currently defining */ | |
698 | ||
699 | unsigned char *pool_tags = (unsigned char*) def->constants.tags; | |
7941ceab | 700 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
701 | |
702 | /* this entry was already prepared */ | |
703 | if (pool_tags[index] == this_tag) | |
704 | return; | |
705 | ||
706 | /* this_data points to the constant-pool information for the current | |
707 | constant-pool entry */ | |
708 | ||
709 | unsigned char *this_data = bytes + offsets[index]; | |
710 | ||
711 | switch (this_tag) | |
712 | { | |
713 | case JV_CONSTANT_Utf8: | |
714 | { | |
715 | // If we came here, it is because some other tag needs this | |
716 | // utf8-entry for type information! Thus, we translate /'s to .'s in | |
717 | // order to accomondate gcj's internal representation. | |
718 | ||
719 | int len = get2u (this_data); | |
c2200099 | 720 | char *buffer = (char*) __builtin_alloca (len); |
58eb6e7c AG |
721 | char *s = ((char*) this_data)+2; |
722 | ||
723 | /* FIXME: avoid using a buffer here */ | |
724 | for (int i = 0; i < len; i++) | |
725 | { | |
726 | if (s[i] == '/') | |
727 | buffer[i] = '.'; | |
728 | else | |
729 | buffer[i] = (char) s[i]; | |
730 | } | |
731 | ||
7941ceab | 732 | pool_data[index].utf8 = _Jv_makeUtf8Const (buffer, len); |
58eb6e7c AG |
733 | pool_tags[index] = JV_CONSTANT_Utf8; |
734 | } | |
735 | break; | |
736 | ||
737 | case JV_CONSTANT_Class: | |
738 | { | |
739 | int utf_index = get2u (this_data); | |
740 | check_tag (utf_index, JV_CONSTANT_Utf8); | |
741 | prepare_pool_entry (utf_index, JV_CONSTANT_Utf8); | |
742 | ||
743 | if (verify) | |
f9edddab | 744 | verify_classname (pool_data[utf_index].utf8); |
58eb6e7c | 745 | |
7941ceab | 746 | pool_data[index].utf8 = pool_data[utf_index].utf8; |
58eb6e7c AG |
747 | pool_tags[index] = JV_CONSTANT_Class; |
748 | } | |
749 | break; | |
750 | ||
751 | case JV_CONSTANT_String: | |
752 | // already handled before... | |
753 | break; | |
754 | ||
755 | case JV_CONSTANT_Fieldref: | |
756 | case JV_CONSTANT_Methodref: | |
757 | case JV_CONSTANT_InterfaceMethodref: | |
758 | { | |
759 | int class_index = get2u (this_data); | |
760 | int nat_index = get2u (this_data+2); | |
761 | ||
762 | check_tag (class_index, JV_CONSTANT_Class); | |
763 | prepare_pool_entry (class_index, JV_CONSTANT_Class); | |
764 | ||
765 | check_tag (nat_index, JV_CONSTANT_NameAndType); | |
766 | prepare_pool_entry (nat_index, JV_CONSTANT_NameAndType); | |
767 | ||
768 | // here, verify the signature and identifier name | |
769 | if (verify) | |
770 | { | |
771 | _Jv_ushort name_index, type_index; | |
7941ceab | 772 | _Jv_loadIndexes (&pool_data[nat_index], |
58eb6e7c AG |
773 | name_index, type_index); |
774 | ||
775 | if (this_tag == JV_CONSTANT_Fieldref) | |
7941ceab | 776 | _Jv_VerifyFieldSignature (pool_data[type_index].utf8); |
58eb6e7c | 777 | else |
7941ceab | 778 | _Jv_VerifyMethodSignature (pool_data[type_index].utf8); |
58eb6e7c | 779 | |
7941ceab | 780 | _Jv_Utf8Const* name = pool_data[name_index].utf8; |
58eb6e7c AG |
781 | |
782 | if (this_tag != JV_CONSTANT_Fieldref | |
783 | && ( _Jv_equalUtf8Consts (name, clinit_name) | |
784 | || _Jv_equalUtf8Consts (name, init_name))) | |
785 | /* ignore */; | |
786 | else | |
f9edddab | 787 | verify_identifier (pool_data[name_index].utf8); |
58eb6e7c AG |
788 | } |
789 | ||
790 | _Jv_storeIndexes (&pool_data[index], class_index, nat_index); | |
791 | pool_tags[index] = this_tag; | |
792 | } | |
793 | break; | |
794 | ||
795 | case JV_CONSTANT_NameAndType: | |
796 | { | |
797 | _Jv_ushort name_index = get2u (this_data); | |
798 | _Jv_ushort type_index = get2u (this_data+2); | |
799 | ||
800 | check_tag (name_index, JV_CONSTANT_Utf8); | |
801 | prepare_pool_entry (name_index, JV_CONSTANT_Utf8); | |
802 | ||
803 | check_tag (type_index, JV_CONSTANT_Utf8); | |
804 | prepare_pool_entry (type_index, JV_CONSTANT_Utf8); | |
805 | ||
806 | _Jv_storeIndexes (&pool_data[index], name_index, type_index); | |
807 | pool_tags[index] = JV_CONSTANT_NameAndType; | |
808 | } | |
809 | break; | |
810 | ||
811 | case JV_CONSTANT_Float: | |
812 | { | |
a12fe13d | 813 | jfloat f = java::lang::Float::intBitsToFloat ((jint) get4 (this_data)); |
58eb6e7c AG |
814 | _Jv_storeFloat (&pool_data[index], f); |
815 | pool_tags[index] = JV_CONSTANT_Float; | |
816 | } | |
817 | break; | |
818 | ||
819 | case JV_CONSTANT_Integer: | |
820 | { | |
821 | int i = get4 (this_data); | |
822 | _Jv_storeInt (&pool_data[index], i); | |
823 | pool_tags[index] = JV_CONSTANT_Integer; | |
824 | } | |
825 | break; | |
826 | ||
827 | case JV_CONSTANT_Double: | |
828 | { | |
a12fe13d TT |
829 | jdouble d |
830 | = java::lang::Double::longBitsToDouble ((jlong) get8 (this_data)); | |
58eb6e7c AG |
831 | _Jv_storeDouble (&pool_data[index], d); |
832 | pool_tags[index] = JV_CONSTANT_Double; | |
833 | } | |
834 | break; | |
835 | ||
836 | case JV_CONSTANT_Long: | |
837 | { | |
838 | jlong i = get8 (this_data); | |
839 | _Jv_storeLong (&pool_data[index], i); | |
840 | pool_tags[index] = JV_CONSTANT_Long; | |
841 | } | |
842 | break; | |
843 | ||
844 | default: | |
845 | throw_class_format_error ("erroneous constant pool tag"); | |
846 | } | |
847 | } | |
848 | ||
849 | ||
850 | void | |
851 | _Jv_ClassReader::handleClassBegin | |
852 | (int access_flags, int this_class, int super_class) | |
853 | { | |
e409a2c8 TT |
854 | using namespace java::lang::reflect; |
855 | ||
58eb6e7c | 856 | unsigned char *pool_tags = (unsigned char*) def->constants.tags; |
7941ceab | 857 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
858 | |
859 | check_tag (this_class, JV_CONSTANT_Class); | |
7941ceab | 860 | _Jv_Utf8Const *loadedName = pool_data[this_class].utf8; |
58eb6e7c AG |
861 | |
862 | // was ClassLoader.defineClass called with an expected class name? | |
863 | if (def->name == 0) | |
864 | { | |
865 | jclass orig = _Jv_FindClassInCache (loadedName, def->loader); | |
866 | ||
867 | if (orig == 0) | |
868 | { | |
869 | def->name = loadedName; | |
870 | } | |
871 | else | |
872 | { | |
873 | jstring msg = JvNewStringUTF ("anonymous " | |
874 | "class data denotes " | |
875 | "existing class "); | |
876 | msg = msg->concat (orig->getName ()); | |
877 | ||
878 | throw_no_class_def_found_error (msg); | |
879 | } | |
880 | } | |
881 | ||
882 | // assert that the loaded class has the expected name, 5.3.5 | |
883 | else if (! _Jv_equalUtf8Consts (loadedName, def->name)) | |
884 | { | |
885 | jstring msg = JvNewStringUTF ("loaded class "); | |
886 | msg = msg->concat (def->getName ()); | |
887 | msg = msg->concat (_Jv_NewStringUTF (" was in fact named ")); | |
888 | jstring klass_name = _Jv_NewStringUTF (loadedName->data); | |
889 | msg = msg->concat (klass_name); | |
890 | ||
891 | throw_no_class_def_found_error (msg); | |
892 | } | |
893 | ||
894 | def->accflags = access_flags; | |
7941ceab | 895 | pool_data[this_class].clazz = def; |
58eb6e7c AG |
896 | pool_tags[this_class] = JV_CONSTANT_ResolvedClass; |
897 | ||
898 | if (super_class == 0) | |
899 | { | |
900 | // interfaces have java.lang.Object as super. | |
e409a2c8 | 901 | if (access_flags & Modifier::INTERFACE) |
58eb6e7c | 902 | { |
a52706f2 | 903 | def->superclass = (jclass)&java::lang::Object::class$; |
58eb6e7c AG |
904 | } |
905 | ||
906 | // FIXME: Consider this carefully! | |
1d336a09 | 907 | else if (!_Jv_equalUtf8Consts (def->name, |
a52706f2 | 908 | java::lang::Object::class$.name)) |
58eb6e7c AG |
909 | { |
910 | throw_no_class_def_found_error ("loading java.lang.Object"); | |
911 | } | |
912 | } | |
913 | ||
914 | // In the pre-loading state, it can be looked up in the | |
915 | // cache only by this thread! This allows the super-class | |
916 | // to include references to this class. | |
917 | ||
918 | def->state = JV_STATE_PRELOADING; | |
107abb2f BM |
919 | |
920 | { | |
921 | JvSynchronize sync (&java::lang::Class::class$); | |
922 | _Jv_RegisterClass (def); | |
923 | } | |
58eb6e7c AG |
924 | |
925 | if (super_class != 0) | |
926 | { | |
927 | // load the super class | |
928 | check_tag (super_class, JV_CONSTANT_Class); | |
7941ceab | 929 | _Jv_Utf8Const* super_name = pool_data[super_class].utf8; |
58eb6e7c AG |
930 | |
931 | // load the super class using our defining loader | |
932 | jclass the_super = _Jv_FindClass (super_name, | |
933 | def->loader); | |
934 | ||
935 | // This will establish that we are allowed to be a subclass, | |
936 | // and check for class circularity error | |
937 | checkExtends (def, the_super); | |
938 | ||
939 | def->superclass = the_super; | |
7941ceab | 940 | pool_data[super_class].clazz = the_super; |
58eb6e7c AG |
941 | pool_tags[super_class] = JV_CONSTANT_ResolvedClass; |
942 | } | |
6d8b1244 | 943 | |
58eb6e7c AG |
944 | // now we've come past the circularity problem, we can |
945 | // now say that we're loading... | |
946 | ||
947 | def->state = JV_STATE_LOADING; | |
948 | def->notifyAll (); | |
949 | } | |
950 | ||
951 | ///// implements the checks described in sect. 5.3.5.3 | |
952 | void | |
953 | _Jv_ClassReader::checkExtends (jclass sub, jclass super) | |
954 | { | |
e409a2c8 TT |
955 | using namespace java::lang::reflect; |
956 | ||
58eb6e7c | 957 | // having an interface or a final class as a superclass is no good |
e409a2c8 | 958 | if ((super->accflags & (Modifier::INTERFACE | Modifier::FINAL)) != 0) |
58eb6e7c AG |
959 | { |
960 | throw_incompatible_class_change_error (sub->getName ()); | |
961 | } | |
962 | ||
963 | // if the super class is not public, we need to check some more | |
e409a2c8 | 964 | if ((super->accflags & Modifier::PUBLIC) == 0) |
58eb6e7c AG |
965 | { |
966 | // With package scope, the classes must have the same | |
967 | // class loader. | |
968 | if ( sub->loader != super->loader | |
969 | || !_Jv_ClassNameSamePackage (sub->name, super->name)) | |
970 | { | |
971 | throw_incompatible_class_change_error (sub->getName ()); | |
972 | } | |
973 | } | |
974 | ||
975 | for (; super != 0; super = super->superclass) | |
976 | { | |
977 | if (super == sub) | |
978 | throw_class_circularity_error (sub->getName ()); | |
979 | } | |
980 | } | |
981 | ||
982 | ||
983 | ||
984 | void _Jv_ClassReader::handleInterfacesBegin (int count) | |
985 | { | |
3610e0d5 | 986 | def->interfaces = (jclass*) _Jv_AllocBytes (count*sizeof (jclass)); |
58eb6e7c AG |
987 | def->interface_count = count; |
988 | } | |
989 | ||
990 | void _Jv_ClassReader::handleInterface (int if_number, int offset) | |
991 | { | |
7941ceab | 992 | _Jv_word * pool_data = def->constants.data; |
58eb6e7c AG |
993 | unsigned char * pool_tags = (unsigned char*) def->constants.tags; |
994 | ||
995 | jclass the_interface; | |
996 | ||
997 | if (pool_tags[offset] == JV_CONSTANT_Class) | |
998 | { | |
7941ceab | 999 | _Jv_Utf8Const* name = pool_data[offset].utf8; |
58eb6e7c AG |
1000 | the_interface = _Jv_FindClass (name, def->loader); |
1001 | } | |
1002 | else if (pool_tags[offset] == JV_CONSTANT_ResolvedClass) | |
1003 | { | |
7941ceab | 1004 | the_interface = pool_data[offset].clazz; |
58eb6e7c AG |
1005 | } |
1006 | else | |
1007 | { | |
1008 | throw_no_class_def_found_error ("erroneous constant pool tag"); | |
1009 | } | |
1010 | ||
1011 | // checks the validity of the_interface, and that we are in fact | |
1012 | // allowed to implement that interface. | |
1013 | checkImplements (def, the_interface); | |
1014 | ||
7941ceab | 1015 | pool_data[offset].clazz = the_interface; |
58eb6e7c AG |
1016 | pool_tags[offset] = JV_CONSTANT_ResolvedClass; |
1017 | ||
1018 | def->interfaces[if_number] = the_interface; | |
1019 | } | |
1020 | ||
1021 | void | |
1022 | _Jv_ClassReader::checkImplements (jclass sub, jclass super) | |
1023 | { | |
e409a2c8 TT |
1024 | using namespace java::lang::reflect; |
1025 | ||
58eb6e7c | 1026 | // well, it *must* be an interface |
e409a2c8 | 1027 | if ((super->accflags & Modifier::INTERFACE) == 0) |
58eb6e7c AG |
1028 | { |
1029 | throw_incompatible_class_change_error (sub->getName ()); | |
1030 | } | |
1031 | ||
1032 | // if it has package scope, it must also be defined by the | |
1033 | // same loader. | |
e409a2c8 | 1034 | if ((super->accflags & Modifier::PUBLIC) == 0) |
58eb6e7c AG |
1035 | { |
1036 | if ( sub->loader != super->loader | |
1037 | || !_Jv_ClassNameSamePackage (sub->name, super->name)) | |
1038 | { | |
1039 | throw_incompatible_class_change_error (sub->getName ()); | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | // FIXME: add interface circularity check here | |
1044 | if (sub == super) | |
1045 | { | |
1046 | throw_class_circularity_error (sub->getName ()); | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | void _Jv_ClassReader::handleFieldsBegin (int count) | |
1051 | { | |
1052 | def->fields = (_Jv_Field*) | |
3610e0d5 | 1053 | _Jv_AllocBytes (count * sizeof (_Jv_Field)); |
58eb6e7c AG |
1054 | def->field_count = count; |
1055 | def->field_initializers = (_Jv_ushort*) | |
3610e0d5 | 1056 | _Jv_AllocBytes (count * sizeof (_Jv_ushort)); |
58eb6e7c AG |
1057 | for (int i = 0; i < count; i++) |
1058 | def->field_initializers[i] = (_Jv_ushort) 0; | |
1059 | } | |
1060 | ||
1061 | void _Jv_ClassReader::handleField (int field_no, | |
1062 | int flags, | |
1063 | int name, | |
1064 | int desc) | |
1065 | { | |
e409a2c8 TT |
1066 | using namespace java::lang::reflect; |
1067 | ||
7941ceab | 1068 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
1069 | |
1070 | _Jv_Field *field = &def->fields[field_no]; | |
7941ceab | 1071 | _Jv_Utf8Const *field_name = pool_data[name].utf8; |
58eb6e7c AG |
1072 | |
1073 | #ifndef COMPACT_FIELDS | |
1074 | field->name = field_name; | |
1075 | #else | |
1076 | field->nameIndex = name; | |
1077 | #endif | |
1078 | ||
1079 | if (verify) | |
f9edddab | 1080 | verify_identifier (field_name); |
58eb6e7c AG |
1081 | |
1082 | // ignore flags we don't know about. | |
e409a2c8 | 1083 | field->flags = flags & Modifier::ALL_FLAGS; |
58eb6e7c AG |
1084 | |
1085 | if (verify) | |
1086 | { | |
e409a2c8 TT |
1087 | if (field->flags & (Modifier::SYNCHRONIZED |
1088 | | Modifier::NATIVE | |
1089 | | Modifier::INTERFACE | |
1090 | | Modifier::ABSTRACT)) | |
58eb6e7c AG |
1091 | throw_class_format_error ("erroneous field access flags"); |
1092 | ||
e409a2c8 TT |
1093 | if (1 < ( ((field->flags & Modifier::PUBLIC) ? 1 : 0) |
1094 | +((field->flags & Modifier::PRIVATE) ? 1 : 0) | |
1095 | +((field->flags & Modifier::PROTECTED) ? 1 : 0))) | |
58eb6e7c AG |
1096 | throw_class_format_error ("erroneous field access flags"); |
1097 | } | |
1098 | ||
7941ceab | 1099 | _Jv_Utf8Const* sig = pool_data[desc].utf8; |
58eb6e7c AG |
1100 | |
1101 | if (verify) | |
1102 | _Jv_VerifyFieldSignature (sig); | |
1103 | ||
1104 | // field->type is really a jclass, but while it is still | |
1105 | // unresolved we keep an _Jv_Utf8Const* instead. | |
1106 | field->type = (jclass) sig; | |
1107 | field->flags |= _Jv_FIELD_UNRESOLVED_FLAG; | |
1108 | field->u.boffset = 0; | |
1109 | } | |
1110 | ||
1111 | ||
1112 | void _Jv_ClassReader::handleConstantValueAttribute (int field_index, | |
1113 | int value) | |
1114 | { | |
e409a2c8 TT |
1115 | using namespace java::lang::reflect; |
1116 | ||
58eb6e7c AG |
1117 | _Jv_Field *field = &def->fields[field_index]; |
1118 | ||
e409a2c8 TT |
1119 | if ((field->flags & (Modifier::STATIC |
1120 | | Modifier::FINAL | |
1121 | | Modifier::PRIVATE)) == 0) | |
58eb6e7c AG |
1122 | { |
1123 | // Ignore, as per vmspec #4.7.2 | |
1124 | return; | |
1125 | } | |
1126 | ||
1127 | // do not allow multiple constant fields! | |
1128 | if (field->flags & _Jv_FIELD_CONSTANT_VALUE) | |
1129 | throw_class_format_error ("field has multiple ConstantValue attributes"); | |
1130 | ||
1131 | field->flags |= _Jv_FIELD_CONSTANT_VALUE; | |
1132 | def->field_initializers[field_index] = value; | |
1133 | ||
1134 | /* type check the initializer */ | |
1135 | ||
1136 | if (value <= 0 || value >= pool_count) | |
1137 | throw_class_format_error ("erroneous ConstantValue attribute"); | |
1138 | ||
1139 | /* FIXME: do the rest */ | |
1140 | } | |
1141 | ||
1142 | void _Jv_ClassReader::handleFieldsEnd () | |
1143 | { | |
e409a2c8 TT |
1144 | using namespace java::lang::reflect; |
1145 | ||
58eb6e7c AG |
1146 | // We need to reorganize the fields so that the static ones are first, |
1147 | // to conform to GCJ class layout. | |
1148 | ||
1149 | int low = 0; | |
1150 | int high = def->field_count-1; | |
1151 | _Jv_Field *fields = def->fields; | |
1152 | _Jv_ushort *inits = def->field_initializers; | |
1153 | ||
1154 | // this is kind of a raw version of quicksort. | |
1155 | while (low < high) | |
1156 | { | |
1157 | // go forward on low, while it's a static | |
e409a2c8 | 1158 | while (low < high && (fields[low].flags & Modifier::STATIC) != 0) |
58eb6e7c AG |
1159 | low++; |
1160 | ||
1161 | // go backwards on high, while it's a non-static | |
e409a2c8 | 1162 | while (low < high && (fields[high].flags & Modifier::STATIC) == 0) |
58eb6e7c AG |
1163 | high--; |
1164 | ||
1165 | if (low==high) | |
1166 | break; | |
1167 | ||
1168 | _Jv_Field tmp = fields[low]; | |
1169 | _Jv_ushort itmp = inits[low]; | |
1170 | ||
1171 | fields[low] = fields[high]; | |
1172 | inits[low] = inits[high]; | |
1173 | ||
1174 | fields[high] = tmp; | |
1175 | inits[high] = itmp; | |
1176 | ||
1177 | high -= 1; | |
1178 | low += 1; | |
1179 | } | |
1180 | ||
e409a2c8 | 1181 | if ((fields[low].flags & Modifier::STATIC) != 0) |
58eb6e7c AG |
1182 | low += 1; |
1183 | ||
1184 | def->static_field_count = low; | |
1185 | } | |
1186 | ||
1187 | ||
1188 | ||
facc279f TT |
1189 | void |
1190 | _Jv_ClassReader::handleMethodsBegin (int count) | |
58eb6e7c AG |
1191 | { |
1192 | def->methods = (_Jv_Method*) | |
3610e0d5 | 1193 | _Jv_AllocBytes (sizeof (_Jv_Method)*count); |
58eb6e7c | 1194 | |
facc279f | 1195 | def->interpreted_methods |
3610e0d5 TT |
1196 | = (_Jv_MethodBase **) _Jv_AllocBytes (sizeof (_Jv_MethodBase *) |
1197 | * count); | |
58eb6e7c AG |
1198 | |
1199 | for (int i = 0; i < count; i++) | |
1200 | def->interpreted_methods[i] = 0; | |
1201 | ||
1202 | def->method_count = count; | |
1203 | } | |
1204 | ||
1205 | ||
1206 | void _Jv_ClassReader::handleMethod | |
1207 | (int mth_index, int accflags, int name, int desc) | |
1208 | { | |
e409a2c8 TT |
1209 | using namespace java::lang::reflect; |
1210 | ||
7941ceab | 1211 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
1212 | _Jv_Method *method = &def->methods[mth_index]; |
1213 | ||
1214 | check_tag (name, JV_CONSTANT_Utf8); | |
1215 | prepare_pool_entry (name, JV_CONSTANT_Utf8); | |
7941ceab | 1216 | method->name = pool_data[name].utf8; |
58eb6e7c AG |
1217 | |
1218 | check_tag (desc, JV_CONSTANT_Utf8); | |
1219 | prepare_pool_entry (desc, JV_CONSTANT_Utf8); | |
7941ceab | 1220 | method->signature = pool_data[desc].utf8; |
58eb6e7c AG |
1221 | |
1222 | // ignore unknown flags | |
e409a2c8 | 1223 | method->accflags = accflags & Modifier::ALL_FLAGS; |
58eb6e7c AG |
1224 | |
1225 | // intialize... | |
1226 | method->ncode = 0; | |
224b7b7b | 1227 | method->throws = NULL; |
58eb6e7c AG |
1228 | |
1229 | if (verify) | |
1230 | { | |
1231 | if (_Jv_equalUtf8Consts (method->name, clinit_name) | |
1232 | || _Jv_equalUtf8Consts (method->name, init_name)) | |
1233 | /* ignore */; | |
1234 | else | |
f9edddab | 1235 | verify_identifier (method->name); |
58eb6e7c AG |
1236 | |
1237 | _Jv_VerifyMethodSignature (method->signature); | |
1238 | ||
e409a2c8 TT |
1239 | if (method->accflags & (Modifier::VOLATILE |
1240 | | Modifier::TRANSIENT | |
1241 | | Modifier::INTERFACE)) | |
58eb6e7c AG |
1242 | throw_class_format_error ("erroneous method access flags"); |
1243 | ||
e409a2c8 TT |
1244 | if (1 < ( ((method->accflags & Modifier::PUBLIC) ? 1 : 0) |
1245 | +((method->accflags & Modifier::PRIVATE) ? 1 : 0) | |
1246 | +((method->accflags & Modifier::PROTECTED) ? 1 : 0))) | |
58eb6e7c AG |
1247 | throw_class_format_error ("erroneous method access flags"); |
1248 | } | |
1249 | } | |
1250 | ||
1251 | void _Jv_ClassReader::handleCodeAttribute | |
1252 | (int method_index, int max_stack, int max_locals, | |
1253 | int code_start, int code_length, int exc_table_length) | |
1254 | { | |
1255 | int size = _Jv_InterpMethod::size (exc_table_length, code_length); | |
1256 | _Jv_InterpMethod *method = | |
3610e0d5 | 1257 | (_Jv_InterpMethod*) (_Jv_AllocBytes (size)); |
58eb6e7c AG |
1258 | |
1259 | method->max_stack = max_stack; | |
1260 | method->max_locals = max_locals; | |
1261 | method->code_length = code_length; | |
1262 | method->exc_count = exc_table_length; | |
1263 | method->defining_class = def; | |
1264 | method->self = &def->methods[method_index]; | |
1265 | ||
1266 | // grab the byte code! | |
1267 | memcpy ((void*) method->bytecode (), | |
1268 | (void*) (bytes+code_start), | |
1269 | code_length); | |
a12fe13d | 1270 | |
58eb6e7c | 1271 | def->interpreted_methods[method_index] = method; |
58eb6e7c AG |
1272 | } |
1273 | ||
1274 | void _Jv_ClassReader::handleExceptionTableEntry | |
1275 | (int method_index, int exc_index, | |
1276 | int start_pc, int end_pc, int handler_pc, int catch_type) | |
1277 | { | |
facc279f TT |
1278 | _Jv_InterpMethod *method = reinterpret_cast<_Jv_InterpMethod *> |
1279 | (def->interpreted_methods[method_index]); | |
58eb6e7c AG |
1280 | _Jv_InterpException *exc = method->exceptions (); |
1281 | ||
1282 | exc[exc_index].start_pc = start_pc; | |
1283 | exc[exc_index].end_pc = end_pc; | |
1284 | exc[exc_index].handler_pc = handler_pc; | |
1285 | exc[exc_index].handler_type = catch_type; | |
1286 | } | |
1287 | ||
1288 | void _Jv_ClassReader::handleMethodsEnd () | |
1289 | { | |
e409a2c8 TT |
1290 | using namespace java::lang::reflect; |
1291 | ||
58eb6e7c AG |
1292 | for (int i = 0; i < def->method_count; i++) |
1293 | { | |
1294 | _Jv_Method *method = &def->methods[i]; | |
facc279f TT |
1295 | if ((method->accflags & Modifier::NATIVE) != 0) |
1296 | { | |
1297 | if (def->interpreted_methods[i] != 0) | |
1298 | throw_class_format_error ("code provided for native method"); | |
1299 | else | |
1300 | { | |
1301 | _Jv_JNIMethod *m = (_Jv_JNIMethod *) | |
3610e0d5 | 1302 | _Jv_AllocBytes (sizeof (_Jv_JNIMethod)); |
facc279f TT |
1303 | m->defining_class = def; |
1304 | m->self = method; | |
1305 | m->function = NULL; | |
1306 | def->interpreted_methods[i] = m; | |
1307 | } | |
1308 | } | |
1309 | else if ((method->accflags & Modifier::ABSTRACT) != 0) | |
58eb6e7c AG |
1310 | { |
1311 | if (def->interpreted_methods[i] != 0) | |
facc279f | 1312 | throw_class_format_error ("code provided for abstract method"); |
58eb6e7c AG |
1313 | } |
1314 | else | |
1315 | { | |
1316 | if (def->interpreted_methods[i] == 0) | |
facc279f | 1317 | throw_class_format_error ("method with no code"); |
58eb6e7c AG |
1318 | } |
1319 | } | |
58eb6e7c AG |
1320 | } |
1321 | ||
f9edddab PB |
1322 | void _Jv_ClassReader::throw_class_format_error (char *msg) |
1323 | { | |
1324 | jstring str; | |
1325 | if (def->name != NULL) | |
1326 | { | |
1327 | jsize mlen = strlen (msg); | |
1328 | unsigned char* data = (unsigned char*) def->name->data; | |
1329 | int ulen = def->name->length; | |
1330 | unsigned char* limit = data + ulen; | |
1331 | jsize nlen = _Jv_strLengthUtf8 ((char *) data, ulen); | |
1332 | jsize len = nlen + mlen + 3; | |
1333 | str = JvAllocString(len); | |
1334 | jchar *chrs = JvGetStringChars(str); | |
1335 | while (data < limit) | |
1336 | *chrs++ = UTF8_GET(data, limit); | |
1337 | *chrs++ = ' '; | |
1338 | *chrs++ = '('; | |
1339 | for (;;) | |
1340 | { | |
1341 | char c = *msg++; | |
1342 | if (c == 0) | |
1343 | break; | |
1344 | *chrs++ = c & 0xFFFF; | |
1345 | } | |
1346 | *chrs++ = ')'; | |
1347 | } | |
1348 | else | |
1349 | str = JvNewStringLatin1 (msg); | |
1350 | ::throw_class_format_error (str); | |
1351 | } | |
58eb6e7c | 1352 | \f |
bea31ffb TT |
1353 | /** Here we define the exceptions that can be thrown */ |
1354 | ||
1355 | static void | |
1356 | throw_no_class_def_found_error (jstring msg) | |
1357 | { | |
1358 | throw (msg | |
1359 | ? new java::lang::NoClassDefFoundError (msg) | |
1360 | : new java::lang::NoClassDefFoundError); | |
1361 | } | |
1362 | ||
1363 | static void | |
1364 | throw_no_class_def_found_error (char *msg) | |
1365 | { | |
1366 | throw_no_class_def_found_error (JvNewStringLatin1 (msg)); | |
1367 | } | |
1368 | ||
1369 | static void | |
1370 | throw_class_format_error (jstring msg) | |
1371 | { | |
1372 | throw (msg | |
1373 | ? new java::lang::ClassFormatError (msg) | |
1374 | : new java::lang::ClassFormatError); | |
1375 | } | |
1376 | ||
1377 | static void | |
1378 | throw_internal_error (char *msg) | |
1379 | { | |
1380 | throw new java::lang::InternalError (JvNewStringLatin1 (msg)); | |
1381 | } | |
1382 | ||
1383 | static void throw_incompatible_class_change_error (jstring msg) | |
1384 | { | |
1385 | throw new java::lang::IncompatibleClassChangeError (msg); | |
1386 | } | |
1387 | ||
1388 | static void throw_class_circularity_error (jstring msg) | |
1389 | { | |
1390 | throw new java::lang::ClassCircularityError (msg); | |
1391 | } | |
1392 | ||
1393 | #endif /* INTERPRETER */ | |
1394 | ||
1395 | \f | |
1396 | ||
58eb6e7c AG |
1397 | /** This section takes care of verifying integrity of identifiers, |
1398 | signatures, field ddescriptors, and class names */ | |
1399 | ||
1400 | #define UTF8_PEEK(PTR, LIMIT) \ | |
1401 | ({ unsigned char* xxkeep = (PTR); \ | |
1402 | int xxch = UTF8_GET(PTR,LIMIT); \ | |
1403 | PTR = xxkeep; xxch; }) | |
1404 | ||
bea31ffb | 1405 | /* Verify one element of a type descriptor or signature. */ |
58eb6e7c AG |
1406 | static unsigned char* |
1407 | _Jv_VerifyOne (unsigned char* ptr, unsigned char* limit, bool void_ok) | |
1408 | { | |
1409 | if (ptr >= limit) | |
1410 | return 0; | |
1411 | ||
1412 | int ch = UTF8_GET (ptr, limit); | |
1413 | ||
1414 | switch (ch) | |
1415 | { | |
1416 | case 'V': | |
bea31ffb TT |
1417 | if (! void_ok) |
1418 | return 0; | |
58eb6e7c AG |
1419 | |
1420 | case 'S': case 'B': case 'I': case 'J': | |
1421 | case 'Z': case 'C': case 'F': case 'D': | |
1422 | break; | |
1423 | ||
1424 | case 'L': | |
1425 | { | |
1426 | unsigned char *start = ptr, *end; | |
bea31ffb TT |
1427 | do |
1428 | { | |
1429 | if (ptr > limit) | |
1430 | return 0; | |
1431 | ||
1432 | end = ptr; | |
1433 | ||
1434 | if ((ch = UTF8_GET (ptr, limit)) == -1) | |
1435 | return 0; | |
1436 | ||
1437 | } | |
1438 | while (ch != ';'); | |
f9edddab PB |
1439 | if (! _Jv_VerifyClassName (start, (unsigned short) (end-start))) |
1440 | return 0; | |
58eb6e7c AG |
1441 | } |
1442 | break; | |
1443 | ||
1444 | case '[': | |
1445 | return _Jv_VerifyOne (ptr, limit, false); | |
1446 | break; | |
bea31ffb | 1447 | |
58eb6e7c AG |
1448 | default: |
1449 | return 0; | |
1450 | } | |
1451 | ||
1452 | return ptr; | |
58eb6e7c AG |
1453 | } |
1454 | ||
bea31ffb | 1455 | /* Verification and loading procedures. */ |
f9edddab | 1456 | bool |
58eb6e7c AG |
1457 | _Jv_VerifyFieldSignature (_Jv_Utf8Const*sig) |
1458 | { | |
1459 | unsigned char* ptr = (unsigned char*) sig->data; | |
1460 | unsigned char* limit = ptr + sig->length; | |
1461 | ||
1462 | ptr = _Jv_VerifyOne (ptr, limit, false); | |
1463 | ||
f9edddab | 1464 | return ptr == limit; |
58eb6e7c AG |
1465 | } |
1466 | ||
f9edddab | 1467 | bool |
58eb6e7c AG |
1468 | _Jv_VerifyMethodSignature (_Jv_Utf8Const*sig) |
1469 | { | |
1470 | unsigned char* ptr = (unsigned char*) sig->data; | |
1471 | unsigned char* limit = ptr + sig->length; | |
1472 | ||
f9edddab PB |
1473 | if (ptr == limit || UTF8_GET(ptr,limit) != '(') |
1474 | return false; | |
58eb6e7c AG |
1475 | |
1476 | while (ptr && UTF8_PEEK (ptr, limit) != ')') | |
1477 | ptr = _Jv_VerifyOne (ptr, limit, false); | |
bea31ffb | 1478 | |
58eb6e7c | 1479 | if (UTF8_GET (ptr, limit) != ')') |
f9edddab | 1480 | return false; |
58eb6e7c AG |
1481 | |
1482 | // get the return type | |
1483 | ptr = _Jv_VerifyOne (ptr, limit, true); | |
1484 | ||
f9edddab | 1485 | return ptr == limit; |
58eb6e7c AG |
1486 | } |
1487 | ||
bea31ffb TT |
1488 | /* We try to avoid calling the Character methods all the time, in |
1489 | fact, they will only be called for non-standard things. */ | |
58eb6e7c AG |
1490 | static __inline__ int |
1491 | is_identifier_start (int c) | |
1492 | { | |
1493 | unsigned int ch = (unsigned)c; | |
1494 | ||
1495 | if ((ch - 0x41U) < 29U) /* A ... Z */ | |
1496 | return 1; | |
1497 | if ((ch - 0x61U) < 29U) /* a ... z */ | |
1498 | return 1; | |
1499 | if (ch == 0x5FU) /* _ */ | |
1500 | return 1; | |
1501 | ||
82ae7822 | 1502 | return java::lang::Character::isJavaIdentifierStart ((jchar) ch); |
58eb6e7c AG |
1503 | } |
1504 | ||
1505 | static __inline__ int | |
1506 | is_identifier_part (int c) | |
1507 | { | |
1508 | unsigned int ch = (unsigned)c; | |
1509 | ||
1510 | if ((ch - 0x41U) < 29U) /* A ... Z */ | |
1511 | return 1; | |
1512 | if ((ch - 0x61U) < 29U) /* a ... z */ | |
1513 | return 1; | |
1514 | if ((ch - 0x30) < 10U) /* 0 .. 9 */ | |
1515 | return 1; | |
1516 | if (ch == 0x5FU || ch == 0x24U) /* _ $ */ | |
1517 | return 1; | |
1518 | ||
82ae7822 | 1519 | return java::lang::Character::isJavaIdentifierStart ((jchar) ch); |
58eb6e7c AG |
1520 | } |
1521 | ||
f9edddab | 1522 | bool |
58eb6e7c AG |
1523 | _Jv_VerifyIdentifier (_Jv_Utf8Const* name) |
1524 | { | |
1525 | unsigned char *ptr = (unsigned char*) name->data; | |
1526 | unsigned char *limit = ptr + name->length; | |
1527 | int ch; | |
1528 | ||
1529 | if ((ch = UTF8_GET (ptr, limit))==-1 | |
1530 | || ! is_identifier_start (ch)) | |
f9edddab | 1531 | return false; |
58eb6e7c AG |
1532 | |
1533 | while (ptr != limit) | |
1534 | { | |
1535 | if ((ch = UTF8_GET (ptr, limit))==-1 | |
1536 | || ! is_identifier_part (ch)) | |
f9edddab | 1537 | return false; |
58eb6e7c | 1538 | } |
f9edddab | 1539 | return true; |
58eb6e7c AG |
1540 | } |
1541 | ||
f9edddab | 1542 | bool |
58eb6e7c AG |
1543 | _Jv_VerifyClassName (unsigned char* ptr, _Jv_ushort length) |
1544 | { | |
1545 | unsigned char *limit = ptr+length; | |
1546 | int ch; | |
1547 | ||
e3253af5 AG |
1548 | if ('[' == UTF8_PEEK (ptr, limit)) |
1549 | { | |
bea31ffb TT |
1550 | unsigned char *end = _Jv_VerifyOne (++ptr, limit, false); |
1551 | // _Jv_VerifyOne must leave us looking at the terminating nul | |
1552 | // byte. | |
1553 | if (! end || *end) | |
f9edddab | 1554 | return false; |
e3253af5 | 1555 | else |
f9edddab | 1556 | return true; |
e3253af5 AG |
1557 | } |
1558 | ||
58eb6e7c | 1559 | next_level: |
f9edddab | 1560 | for (;;) { |
58eb6e7c | 1561 | if ((ch = UTF8_GET (ptr, limit))==-1) |
f9edddab | 1562 | return false; |
58eb6e7c | 1563 | if (! is_identifier_start (ch)) |
f9edddab PB |
1564 | return false; |
1565 | for (;;) { | |
58eb6e7c | 1566 | if (ptr == limit) |
f9edddab | 1567 | return true; |
58eb6e7c | 1568 | else if ((ch = UTF8_GET (ptr, limit))==-1) |
f9edddab | 1569 | return false; |
58eb6e7c AG |
1570 | else if (ch == '.') |
1571 | goto next_level; | |
1572 | else if (! is_identifier_part (ch)) | |
f9edddab PB |
1573 | return false; |
1574 | } | |
1575 | } | |
58eb6e7c AG |
1576 | } |
1577 | ||
f9edddab | 1578 | bool |
58eb6e7c AG |
1579 | _Jv_VerifyClassName (_Jv_Utf8Const *name) |
1580 | { | |
f9edddab PB |
1581 | return _Jv_VerifyClassName ((unsigned char*)&name->data[0], |
1582 | (_Jv_ushort) name->length); | |
58eb6e7c AG |
1583 | } |
1584 | ||
bea31ffb TT |
1585 | /* Returns true, if NAME1 and NAME2 represent classes in the same |
1586 | package. */ | |
58eb6e7c AG |
1587 | bool |
1588 | _Jv_ClassNameSamePackage (_Jv_Utf8Const *name1, _Jv_Utf8Const *name2) | |
1589 | { | |
1590 | unsigned char* ptr1 = (unsigned char*) name1->data; | |
1591 | unsigned char* limit1 = ptr1 + name1->length; | |
1592 | ||
1593 | unsigned char* last1 = ptr1; | |
1594 | ||
1595 | // scan name1, and find the last occurrence of '.' | |
1596 | while (ptr1 < limit1) { | |
1597 | int ch1 = UTF8_GET (ptr1, limit1); | |
1598 | ||
1599 | if (ch1 == '.') | |
1600 | last1 = ptr1; | |
bea31ffb | 1601 | |
58eb6e7c AG |
1602 | else if (ch1 == -1) |
1603 | return false; | |
1604 | } | |
1605 | ||
bea31ffb | 1606 | // Now the length of NAME1's package name is LEN. |
58eb6e7c AG |
1607 | int len = last1 - (unsigned char*) name1->data; |
1608 | ||
bea31ffb | 1609 | // If this is longer than NAME2, then we're off. |
58eb6e7c AG |
1610 | if (len > name2->length) |
1611 | return false; | |
1612 | ||
bea31ffb | 1613 | // Then compare the first len bytes for equality. |
58eb6e7c AG |
1614 | if (memcmp ((void*) name1->data, (void*) name2->data, len) == 0) |
1615 | { | |
bea31ffb | 1616 | // Check that there are no .'s after position LEN in NAME2. |
58eb6e7c AG |
1617 | |
1618 | unsigned char* ptr2 = (unsigned char*) name2->data + len; | |
1619 | unsigned char* limit2 = | |
1620 | (unsigned char*) name2->data + name2->length; | |
1621 | ||
1622 | while (ptr2 < limit2) | |
1623 | { | |
1624 | int ch2 = UTF8_GET (ptr2, limit2); | |
1625 | if (ch2 == -1 || ch2 == '.') | |
1626 | return false; | |
1627 | } | |
1628 | return true; | |
1629 | } | |
1630 | return false; | |
1631 | } |