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58eb6e7c AG |
1 | // defineclass.cc - defining a class from .class format. |
2 | ||
4c98b1b0 | 3 | /* Copyright (C) 1999, 2000, 2001, 2002, 2003 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> | |
58eb6e7c | 38 | #include <java/lang/IncompatibleClassChangeError.h> |
e409a2c8 | 39 | #include <java/lang/reflect/Modifier.h> |
58eb6e7c | 40 | |
107abb2f | 41 | using namespace gcj; |
58eb6e7c | 42 | |
bea31ffb TT |
43 | #ifdef INTERPRETER |
44 | ||
cc712abf | 45 | // these go in some separate functions, to avoid having _Jv_InitClass |
58eb6e7c AG |
46 | // inserted all over the place. |
47 | static void throw_internal_error (char *msg) | |
48 | __attribute__ ((__noreturn__)); | |
49 | static void throw_no_class_def_found_error (jstring msg) | |
50 | __attribute__ ((__noreturn__)); | |
51 | static void throw_no_class_def_found_error (char *msg) | |
52 | __attribute__ ((__noreturn__)); | |
53 | static void throw_class_format_error (jstring msg) | |
54 | __attribute__ ((__noreturn__)); | |
58eb6e7c AG |
55 | static void throw_incompatible_class_change_error (jstring msg) |
56 | __attribute__ ((__noreturn__)); | |
57 | static void throw_class_circularity_error (jstring msg) | |
58 | __attribute__ ((__noreturn__)); | |
59 | ||
58eb6e7c AG |
60 | /** |
61 | * We define class reading using a class. It is practical, since then | |
62 | * the entire class-reader can be a friend of class Class (it needs to | |
63 | * write all it's different structures); but also because this makes it | |
64 | * easy to make class definition reentrant, and thus two threads can be | |
65 | * defining classes at the same time. This class (_Jv_ClassReader) is | |
66 | * never exposed outside this file, so we don't have to worry about | |
67 | * public or private members here. | |
68 | */ | |
69 | ||
70 | struct _Jv_ClassReader { | |
71 | ||
72 | // do verification? Currently, there is no option to disable this. | |
73 | // This flag just controls the verificaiton done by the class loader; | |
74 | // i.e., checking the integrity of the constant pool; and it is | |
75 | // allways on. You always want this as far as I can see, but it also | |
76 | // controls weither identifiers and type descriptors/signatures are | |
77 | // verified as legal. This could be somewhat more expensive since it | |
a47c20a7 | 78 | // will call Character.isJavaIdentifier{Start,Part} for each character |
58eb6e7c AG |
79 | // in any identifier (field name or method name) it comes by. Thus, |
80 | // it might be useful to turn off this verification for classes that | |
81 | // come from a trusted source. However, for GCJ, trusted classes are | |
82 | // most likely to be linked in. | |
83 | ||
84 | bool verify; | |
85 | ||
86 | // input data. | |
87 | unsigned char *bytes; | |
88 | int len; | |
89 | ||
90 | // current input position | |
91 | int pos; | |
92 | ||
93 | // the constant pool data | |
94 | int pool_count; | |
95 | unsigned char *tags; | |
96 | unsigned int *offsets; | |
97 | ||
98 | // the class to define (see java-interp.h) | |
99 | _Jv_InterpClass *def; | |
100 | ||
101 | /* check that the given number of input bytes are available */ | |
102 | inline void check (int num) | |
103 | { | |
104 | if (pos + num > len) | |
105 | throw_class_format_error ("Premature end of data"); | |
106 | } | |
107 | ||
108 | /* skip a given number of bytes in input */ | |
109 | inline void skip (int num) | |
110 | { | |
111 | check (num); | |
112 | pos += num; | |
113 | } | |
114 | ||
115 | /* read an unsignend 1-byte unit */ | |
116 | inline static jint get1u (unsigned char* bytes) | |
117 | { | |
118 | return bytes[0]; | |
119 | } | |
120 | ||
121 | /* read an unsigned 1-byte unit */ | |
122 | inline jint read1u () | |
123 | { | |
124 | skip (1); | |
125 | return get1u (bytes+pos-1); | |
126 | } | |
127 | ||
128 | /* read an unsigned 2-byte unit */ | |
129 | inline static jint get2u (unsigned char *bytes) | |
130 | { | |
131 | return (((jint)bytes[0]) << 8) | ((jint)bytes[1]); | |
132 | } | |
133 | ||
134 | /* read an unsigned 2-byte unit */ | |
135 | inline jint read2u () | |
136 | { | |
137 | skip (2); | |
138 | return get2u (bytes+pos-2); | |
139 | } | |
140 | ||
141 | /* read a 4-byte unit */ | |
142 | static jint get4 (unsigned char *bytes) | |
143 | { | |
144 | return (((jint)bytes[0]) << 24) | |
145 | | (((jint)bytes[1]) << 16) | |
146 | | (((jint)bytes[2]) << 8) | |
147 | | (((jint)bytes[3]) << 0); | |
148 | } | |
149 | ||
150 | /* read a 4-byte unit, (we don't do that quite so often) */ | |
151 | inline jint read4 () | |
152 | { | |
153 | skip (4); | |
154 | return get4 (bytes+pos-4); | |
155 | } | |
156 | ||
157 | /* read a 8-byte unit */ | |
158 | static jlong get8 (unsigned char* bytes) | |
159 | { | |
160 | return (((jlong)bytes[0]) << 56) | |
161 | | (((jlong)bytes[1]) << 48) | |
162 | | (((jlong)bytes[2]) << 40) | |
163 | | (((jlong)bytes[3]) << 32) | |
164 | | (((jlong)bytes[4]) << 24) | |
165 | | (((jlong)bytes[5]) << 16) | |
166 | | (((jlong)bytes[6]) << 8) | |
167 | | (((jlong)bytes[7]) << 0); | |
168 | } | |
169 | ||
170 | /* read a 8-byte unit */ | |
171 | inline jlong read8 () | |
172 | { | |
173 | skip (8); | |
174 | return get8 (bytes+pos-8); | |
175 | } | |
176 | ||
177 | inline void check_tag (int index, char expected_tag) | |
178 | { | |
179 | if (index < 0 | |
180 | || index > pool_count | |
181 | || tags[index] != expected_tag) | |
182 | throw_class_format_error ("erroneous constant pool tag"); | |
183 | } | |
184 | ||
f9edddab PB |
185 | inline void verify_identifier (_Jv_Utf8Const* name) |
186 | { | |
187 | if (! _Jv_VerifyIdentifier (name)) | |
188 | throw_class_format_error ("erroneous identifier"); | |
189 | } | |
190 | ||
191 | inline void verify_classname (unsigned char* ptr, _Jv_ushort length) | |
192 | { | |
193 | if (! _Jv_VerifyClassName (ptr, length)) | |
194 | throw_class_format_error ("erroneous class name"); | |
195 | } | |
196 | ||
197 | inline void verify_classname (_Jv_Utf8Const *name) | |
198 | { | |
199 | if (! _Jv_VerifyClassName (name)) | |
200 | throw_class_format_error ("erroneous class name"); | |
201 | } | |
202 | ||
203 | inline void verify_field_signature (_Jv_Utf8Const *sig) | |
204 | { | |
205 | if (! _Jv_VerifyFieldSignature (sig)) | |
206 | throw_class_format_error ("erroneous type descriptor"); | |
207 | } | |
208 | ||
209 | inline void verify_method_signature (_Jv_Utf8Const *sig) | |
210 | { | |
211 | if (! _Jv_VerifyMethodSignature (sig)) | |
212 | throw_class_format_error ("erroneous type descriptor"); | |
213 | } | |
214 | ||
58eb6e7c AG |
215 | _Jv_ClassReader (jclass klass, jbyteArray data, jint offset, jint length) |
216 | { | |
217 | if (klass == 0 || length < 0 || offset+length > data->length) | |
218 | throw_internal_error ("arguments to _Jv_DefineClass"); | |
219 | ||
220 | verify = true; | |
221 | bytes = (unsigned char*) (elements (data)+offset); | |
222 | len = length; | |
223 | pos = 0; | |
224 | def = (_Jv_InterpClass*) klass; | |
225 | } | |
226 | ||
227 | /** and here goes the parser members defined out-of-line */ | |
228 | void parse (); | |
229 | void read_constpool (); | |
230 | void prepare_pool_entry (int index, unsigned char tag); | |
231 | void read_fields (); | |
232 | void read_methods (); | |
233 | void read_one_class_attribute (); | |
234 | void read_one_method_attribute (int method); | |
235 | void read_one_code_attribute (int method); | |
236 | void read_one_field_attribute (int field); | |
f9edddab | 237 | void throw_class_format_error (char *msg); |
58eb6e7c AG |
238 | |
239 | /** check an utf8 entry, without creating a Utf8Const object */ | |
240 | bool is_attribute_name (int index, char *name); | |
241 | ||
242 | /** here goes the class-loader members defined out-of-line */ | |
243 | void handleConstantPool (); | |
244 | void handleClassBegin (int, int, int); | |
245 | void handleInterfacesBegin (int); | |
246 | void handleInterface (int, int); | |
247 | void handleFieldsBegin (int); | |
248 | void handleField (int, int, int, int); | |
249 | void handleFieldsEnd (); | |
250 | void handleConstantValueAttribute (int,int); | |
251 | void handleMethodsBegin (int); | |
252 | void handleMethod (int, int, int, int); | |
253 | void handleMethodsEnd (); | |
254 | void handleCodeAttribute (int, int, int, int, int, int); | |
255 | void handleExceptionTableEntry (int, int, int, int, int, int); | |
256 | ||
257 | void checkExtends (jclass sub, jclass super); | |
258 | void checkImplements (jclass sub, jclass super); | |
259 | ||
260 | /* | |
261 | * FIXME: we should keep a hash table of utf8-strings, since many will | |
262 | * be the same. It's a little tricky, however, because the hash table | |
263 | * needs to interact gracefully with the garbage collector. Much | |
264 | * memory is to be saved by this, however! perhaps the improvement | |
265 | * could be implemented in prims.cc (_Jv_makeUtf8Const), since it | |
266 | * computes the hash value anyway. | |
267 | */ | |
58eb6e7c AG |
268 | }; |
269 | ||
58eb6e7c AG |
270 | void |
271 | _Jv_DefineClass (jclass klass, jbyteArray data, jint offset, jint length) | |
272 | { | |
58eb6e7c AG |
273 | _Jv_ClassReader reader (klass, data, offset, length); |
274 | reader.parse(); | |
275 | ||
276 | /* that's it! */ | |
277 | } | |
278 | ||
58eb6e7c AG |
279 | \f |
280 | /** This section defines the parsing/scanning of the class data */ | |
281 | ||
282 | void | |
283 | _Jv_ClassReader::parse () | |
284 | { | |
285 | int magic = read4 (); | |
286 | ||
287 | /* FIXME: Decide which range of version numbers to allow */ | |
288 | ||
289 | /* int minor_version = */ read2u (); | |
290 | /* int major_verson = */ read2u (); | |
291 | ||
292 | if (magic != (int) 0xCAFEBABE) | |
293 | throw_class_format_error ("bad magic number"); | |
294 | ||
295 | pool_count = read2u (); | |
296 | ||
297 | read_constpool (); | |
298 | ||
299 | int access_flags = read2u (); | |
300 | int this_class = read2u (); | |
301 | int super_class = read2u (); | |
302 | ||
303 | check_tag (this_class, JV_CONSTANT_Class); | |
304 | if (super_class != 0) | |
305 | check_tag (super_class, JV_CONSTANT_Class); | |
306 | ||
307 | handleClassBegin (access_flags, this_class, super_class); | |
308 | ||
309 | int interfaces_count = read2u (); | |
310 | ||
311 | handleInterfacesBegin (interfaces_count); | |
312 | ||
313 | for (int i = 0; i < interfaces_count; i++) | |
314 | { | |
315 | int iface = read2u (); | |
316 | check_tag (iface, JV_CONSTANT_Class); | |
317 | handleInterface (i, iface); | |
318 | } | |
319 | ||
320 | read_fields (); | |
321 | read_methods (); | |
322 | ||
323 | int attributes_count = read2u (); | |
324 | ||
325 | for (int i = 0; i < attributes_count; i++) | |
326 | { | |
327 | read_one_class_attribute (); | |
328 | } | |
329 | ||
330 | if (pos != len) | |
331 | throw_class_format_error ("unused data before end of file"); | |
332 | ||
333 | // tell everyone we're done. | |
334 | def->state = JV_STATE_LOADED; | |
335 | def->notifyAll (); | |
336 | ||
337 | } | |
338 | ||
339 | void _Jv_ClassReader::read_constpool () | |
340 | { | |
3610e0d5 TT |
341 | tags = (unsigned char*) _Jv_AllocBytes (pool_count); |
342 | offsets = (unsigned int *) _Jv_AllocBytes (sizeof (int) | |
58eb6e7c AG |
343 | * pool_count) ; |
344 | ||
345 | /** first, we scan the constant pool, collecting tags and offsets */ | |
346 | tags[0] = JV_CONSTANT_Undefined; | |
347 | offsets[0] = pos; | |
348 | for (int c = 1; c < pool_count; c++) | |
349 | { | |
350 | tags[c] = read1u (); | |
351 | offsets[c] = pos; | |
352 | ||
353 | switch (tags[c]) | |
354 | { | |
355 | case JV_CONSTANT_String: | |
356 | case JV_CONSTANT_Class: | |
357 | skip (2); | |
358 | break; | |
359 | ||
360 | case JV_CONSTANT_Fieldref: | |
361 | case JV_CONSTANT_Methodref: | |
362 | case JV_CONSTANT_InterfaceMethodref: | |
363 | case JV_CONSTANT_NameAndType: | |
364 | case JV_CONSTANT_Integer: | |
365 | case JV_CONSTANT_Float: | |
366 | skip (4); | |
367 | break; | |
368 | ||
369 | case JV_CONSTANT_Double: | |
370 | case JV_CONSTANT_Long: | |
371 | skip (8); | |
372 | tags[++c] = JV_CONSTANT_Undefined; | |
373 | break; | |
374 | ||
375 | case JV_CONSTANT_Utf8: | |
376 | { | |
377 | int len = read2u (); | |
378 | skip (len); | |
379 | } | |
380 | break; | |
381 | ||
382 | case JV_CONSTANT_Unicode: | |
383 | throw_class_format_error ("unicode not supported"); | |
384 | break; | |
385 | ||
386 | default: | |
387 | throw_class_format_error ("erroneous constant pool tag"); | |
388 | } | |
389 | } | |
390 | ||
391 | handleConstantPool (); | |
392 | } | |
393 | ||
394 | ||
395 | void _Jv_ClassReader::read_fields () | |
396 | { | |
397 | int fields_count = read2u (); | |
398 | handleFieldsBegin (fields_count); | |
399 | ||
400 | for (int i = 0; i < fields_count; i++) | |
401 | { | |
402 | int access_flags = read2u (); | |
403 | int name_index = read2u (); | |
404 | int descriptor_index = read2u (); | |
405 | int attributes_count = read2u (); | |
a47c20a7 | 406 | |
58eb6e7c AG |
407 | check_tag (name_index, JV_CONSTANT_Utf8); |
408 | prepare_pool_entry (name_index, JV_CONSTANT_Utf8); | |
409 | ||
410 | check_tag (descriptor_index, JV_CONSTANT_Utf8); | |
411 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
a47c20a7 | 412 | |
58eb6e7c | 413 | handleField (i, access_flags, name_index, descriptor_index); |
a47c20a7 | 414 | |
58eb6e7c AG |
415 | for (int j = 0; j < attributes_count; j++) |
416 | { | |
417 | read_one_field_attribute (i); | |
418 | } | |
419 | } | |
420 | ||
421 | handleFieldsEnd (); | |
422 | } | |
423 | ||
424 | bool | |
425 | _Jv_ClassReader::is_attribute_name (int index, char *name) | |
426 | { | |
427 | check_tag (index, JV_CONSTANT_Utf8); | |
428 | int len = get2u (bytes+offsets[index]); | |
429 | if (len != (int) strlen (name)) | |
430 | return false; | |
431 | else | |
432 | return !memcmp (bytes+offsets[index]+2, name, len); | |
433 | } | |
434 | ||
435 | void _Jv_ClassReader::read_one_field_attribute (int field_index) | |
436 | { | |
437 | int name = read2u (); | |
438 | int length = read4 (); | |
439 | ||
440 | if (is_attribute_name (name, "ConstantValue")) | |
441 | { | |
442 | int cv = read2u (); | |
443 | ||
444 | if (cv < pool_count | |
445 | && cv > 0 | |
446 | && (tags[cv] == JV_CONSTANT_Integer | |
447 | || tags[cv] == JV_CONSTANT_Float | |
448 | || tags[cv] == JV_CONSTANT_Long | |
449 | || tags[cv] == JV_CONSTANT_Double | |
450 | || tags[cv] == JV_CONSTANT_String)) | |
451 | { | |
452 | handleConstantValueAttribute (field_index, cv); | |
453 | } | |
454 | else | |
455 | { | |
456 | throw_class_format_error ("erroneous ConstantValue attribute"); | |
457 | } | |
458 | ||
459 | if (length != 2) | |
460 | throw_class_format_error ("erroneous ConstantValue attribute"); | |
461 | } | |
462 | ||
463 | else | |
464 | { | |
465 | skip (length); | |
466 | } | |
467 | } | |
468 | ||
469 | void _Jv_ClassReader::read_methods () | |
470 | { | |
471 | int methods_count = read2u (); | |
472 | ||
473 | handleMethodsBegin (methods_count); | |
474 | ||
475 | for (int i = 0; i < methods_count; i++) | |
476 | { | |
477 | int access_flags = read2u (); | |
478 | int name_index = read2u (); | |
479 | int descriptor_index = read2u (); | |
480 | int attributes_count = read2u (); | |
481 | ||
482 | check_tag (name_index, JV_CONSTANT_Utf8); | |
483 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
484 | ||
485 | check_tag (name_index, JV_CONSTANT_Utf8); | |
486 | prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8); | |
64d3a1b4 | 487 | |
58eb6e7c AG |
488 | handleMethod (i, access_flags, name_index, |
489 | descriptor_index); | |
64d3a1b4 | 490 | |
58eb6e7c AG |
491 | for (int j = 0; j < attributes_count; j++) |
492 | { | |
493 | read_one_method_attribute (i); | |
494 | } | |
495 | } | |
496 | ||
497 | handleMethodsEnd (); | |
498 | } | |
499 | ||
500 | void _Jv_ClassReader::read_one_method_attribute (int method_index) | |
501 | { | |
502 | int name = read2u (); | |
503 | int length = read4 (); | |
504 | ||
505 | if (is_attribute_name (name, "Exceptions")) | |
506 | { | |
224b7b7b TT |
507 | _Jv_Method *method = reinterpret_cast<_Jv_Method *> |
508 | (&def->methods[method_index]); | |
509 | if (method->throws != NULL) | |
510 | throw_class_format_error ("only one Exceptions attribute allowed per method"); | |
511 | ||
512 | int num_exceptions = read2u (); | |
513 | // We use malloc here because the GC won't scan the method | |
514 | // objects. FIXME this means a memory leak if we GC a class. | |
515 | // (Currently we never do.) | |
516 | _Jv_Utf8Const **exceptions = | |
517 | (_Jv_Utf8Const **) _Jv_Malloc ((num_exceptions + 1) * sizeof (_Jv_Utf8Const *)); | |
518 | ||
519 | int out = 0; | |
520 | _Jv_word *pool_data = def->constants.data; | |
521 | for (int i = 0; i < num_exceptions; ++i) | |
522 | { | |
523 | try | |
524 | { | |
525 | int ndx = read2u (); | |
526 | // JLS 2nd Ed. 4.7.5 requires that the tag not be 0. | |
527 | if (ndx != 0) | |
528 | { | |
529 | check_tag (ndx, JV_CONSTANT_Class); | |
530 | exceptions[out++] = pool_data[ndx].utf8; | |
531 | } | |
532 | } | |
533 | catch (java::lang::Throwable *exc) | |
534 | { | |
535 | _Jv_Free (exceptions); | |
536 | throw exc; | |
537 | } | |
538 | } | |
539 | exceptions[out] = NULL; | |
540 | method->throws = exceptions; | |
58eb6e7c | 541 | } |
224b7b7b | 542 | |
58eb6e7c AG |
543 | else if (is_attribute_name (name, "Code")) |
544 | { | |
545 | int start_off = pos; | |
546 | int max_stack = read2u (); | |
547 | int max_locals = read2u (); | |
548 | int code_length = read4 (); | |
549 | ||
550 | int code_start = pos; | |
551 | skip (code_length); | |
552 | int exception_table_length = read2u (); | |
553 | ||
554 | handleCodeAttribute (method_index, | |
555 | max_stack, max_locals, | |
556 | code_start, code_length, | |
557 | exception_table_length); | |
558 | ||
559 | ||
560 | for (int i = 0; i < exception_table_length; i++) | |
561 | { | |
562 | int start_pc = read2u (); | |
563 | int end_pc = read2u (); | |
564 | int handler_pc = read2u (); | |
565 | int catch_type = read2u (); | |
566 | ||
567 | if (start_pc > end_pc | |
568 | || start_pc < 0 | |
ef9f3bc4 TT |
569 | // END_PC can be equal to CODE_LENGTH. |
570 | // See JVM Spec 4.7.4. | |
571 | || end_pc > code_length | |
58eb6e7c AG |
572 | || handler_pc >= code_length) |
573 | throw_class_format_error ("erroneous exception handler info"); | |
574 | ||
575 | if (! (tags[catch_type] == JV_CONSTANT_Class | |
576 | || tags[catch_type] == 0)) | |
577 | { | |
578 | throw_class_format_error ("erroneous exception handler info"); | |
579 | } | |
580 | ||
581 | handleExceptionTableEntry (method_index, | |
582 | i, | |
583 | start_pc, | |
584 | end_pc, | |
585 | handler_pc, | |
586 | catch_type); | |
587 | ||
588 | } | |
589 | ||
590 | int attributes_count = read2u (); | |
591 | ||
592 | for (int i = 0; i < attributes_count; i++) | |
593 | { | |
594 | read_one_code_attribute (method_index); | |
595 | } | |
596 | ||
597 | if ((pos - start_off) != length) | |
598 | throw_class_format_error ("code attribute too short"); | |
599 | } | |
600 | ||
601 | else | |
602 | { | |
603 | /* ignore unknown attributes */ | |
604 | skip (length); | |
605 | } | |
606 | } | |
607 | ||
608 | void _Jv_ClassReader::read_one_code_attribute (int /*method*/) | |
609 | { | |
610 | /* ignore for now, ... later we may want to pick up | |
611 | line number information, for debugging purposes; | |
612 | in fact, the whole debugger issue is open! */ | |
613 | ||
614 | /* int name = */ read2u (); | |
615 | int length = read4 (); | |
616 | skip (length); | |
617 | ||
618 | } | |
619 | ||
620 | void _Jv_ClassReader::read_one_class_attribute () | |
621 | { | |
622 | /* we also ignore the class attributes, ... | |
623 | some day we'll add inner-classes support. */ | |
624 | ||
625 | /* int name = */ read2u (); | |
626 | int length = read4 (); | |
627 | skip (length); | |
628 | } | |
629 | ||
630 | ||
631 | ||
632 | \f | |
633 | /* this section defines the semantic actions of the parser */ | |
634 | ||
635 | void _Jv_ClassReader::handleConstantPool () | |
636 | { | |
637 | /** now, we actually define the class' constant pool */ | |
638 | ||
639 | // the pool is scanned explicitly by the collector | |
3610e0d5 | 640 | jbyte *pool_tags = (jbyte*) _Jv_AllocBytes (pool_count); |
7941ceab | 641 | _Jv_word *pool_data |
3610e0d5 | 642 | = (_Jv_word*) _Jv_AllocBytes (pool_count * sizeof (_Jv_word)); |
58eb6e7c AG |
643 | |
644 | def->constants.tags = pool_tags; | |
645 | def->constants.data = pool_data; | |
646 | def->constants.size = pool_count; | |
647 | ||
648 | // Here we make a pass to collect the strings! We do this, because | |
649 | // internally in the GCJ runtime, classes are encoded with .'s not /'s. | |
650 | // Therefore, we first collect the strings, and then translate the rest | |
651 | // of the utf8-entries (thus not representing strings) from /-notation | |
652 | // to .-notation. | |
653 | for (int i = 1; i < pool_count; i++) | |
654 | { | |
655 | if (tags[i] == JV_CONSTANT_String) | |
656 | { | |
657 | unsigned char* str_data = bytes + offsets [i]; | |
658 | int utf_index = get2u (str_data); | |
659 | check_tag (utf_index, JV_CONSTANT_Utf8); | |
660 | unsigned char *utf_data = bytes + offsets[utf_index]; | |
661 | int len = get2u (utf_data); | |
7941ceab | 662 | pool_data[i].utf8 = _Jv_makeUtf8Const ((char*)(utf_data+2), len); |
58eb6e7c AG |
663 | pool_tags[i] = JV_CONSTANT_String; |
664 | } | |
665 | else | |
666 | { | |
667 | pool_tags[i] = JV_CONSTANT_Undefined; | |
668 | } | |
669 | } | |
670 | ||
671 | // and now, we scan everything else but strings & utf8-entries. This | |
672 | // leaves out those utf8-entries which are not used; which will be left | |
673 | // with a tag of JV_CONSTANT_Undefined in the class definition. | |
674 | for (int index = 1; index < pool_count; index++) | |
675 | { | |
676 | switch (tags[index]) | |
677 | { | |
678 | case JV_CONSTANT_Undefined: | |
679 | case JV_CONSTANT_String: | |
680 | case JV_CONSTANT_Utf8: | |
681 | continue; | |
682 | ||
683 | default: | |
684 | prepare_pool_entry (index, tags[index]); | |
685 | } | |
686 | } | |
687 | ||
688 | } | |
689 | ||
690 | /* this is a recursive procedure, which will prepare pool entries as needed. | |
691 | Which is how we avoid initializing those entries which go unused. */ | |
692 | void | |
693 | _Jv_ClassReader::prepare_pool_entry (int index, unsigned char this_tag) | |
694 | { | |
695 | /* these two, pool_data and pool_tags, point into the class | |
696 | structure we are currently defining */ | |
697 | ||
698 | unsigned char *pool_tags = (unsigned char*) def->constants.tags; | |
7941ceab | 699 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
700 | |
701 | /* this entry was already prepared */ | |
702 | if (pool_tags[index] == this_tag) | |
703 | return; | |
704 | ||
705 | /* this_data points to the constant-pool information for the current | |
706 | constant-pool entry */ | |
707 | ||
708 | unsigned char *this_data = bytes + offsets[index]; | |
709 | ||
710 | switch (this_tag) | |
711 | { | |
712 | case JV_CONSTANT_Utf8: | |
713 | { | |
714 | // If we came here, it is because some other tag needs this | |
715 | // utf8-entry for type information! Thus, we translate /'s to .'s in | |
716 | // order to accomondate gcj's internal representation. | |
717 | ||
718 | int len = get2u (this_data); | |
c2200099 | 719 | char *buffer = (char*) __builtin_alloca (len); |
58eb6e7c AG |
720 | char *s = ((char*) this_data)+2; |
721 | ||
722 | /* FIXME: avoid using a buffer here */ | |
723 | for (int i = 0; i < len; i++) | |
724 | { | |
725 | if (s[i] == '/') | |
726 | buffer[i] = '.'; | |
727 | else | |
728 | buffer[i] = (char) s[i]; | |
729 | } | |
730 | ||
7941ceab | 731 | pool_data[index].utf8 = _Jv_makeUtf8Const (buffer, len); |
58eb6e7c AG |
732 | pool_tags[index] = JV_CONSTANT_Utf8; |
733 | } | |
734 | break; | |
735 | ||
736 | case JV_CONSTANT_Class: | |
737 | { | |
738 | int utf_index = get2u (this_data); | |
739 | check_tag (utf_index, JV_CONSTANT_Utf8); | |
740 | prepare_pool_entry (utf_index, JV_CONSTANT_Utf8); | |
741 | ||
742 | if (verify) | |
f9edddab | 743 | verify_classname (pool_data[utf_index].utf8); |
58eb6e7c | 744 | |
7941ceab | 745 | pool_data[index].utf8 = pool_data[utf_index].utf8; |
58eb6e7c AG |
746 | pool_tags[index] = JV_CONSTANT_Class; |
747 | } | |
748 | break; | |
749 | ||
750 | case JV_CONSTANT_String: | |
751 | // already handled before... | |
752 | break; | |
753 | ||
754 | case JV_CONSTANT_Fieldref: | |
755 | case JV_CONSTANT_Methodref: | |
756 | case JV_CONSTANT_InterfaceMethodref: | |
757 | { | |
758 | int class_index = get2u (this_data); | |
759 | int nat_index = get2u (this_data+2); | |
760 | ||
761 | check_tag (class_index, JV_CONSTANT_Class); | |
762 | prepare_pool_entry (class_index, JV_CONSTANT_Class); | |
763 | ||
764 | check_tag (nat_index, JV_CONSTANT_NameAndType); | |
765 | prepare_pool_entry (nat_index, JV_CONSTANT_NameAndType); | |
766 | ||
767 | // here, verify the signature and identifier name | |
768 | if (verify) | |
769 | { | |
770 | _Jv_ushort name_index, type_index; | |
7941ceab | 771 | _Jv_loadIndexes (&pool_data[nat_index], |
58eb6e7c AG |
772 | name_index, type_index); |
773 | ||
774 | if (this_tag == JV_CONSTANT_Fieldref) | |
7941ceab | 775 | _Jv_VerifyFieldSignature (pool_data[type_index].utf8); |
58eb6e7c | 776 | else |
7941ceab | 777 | _Jv_VerifyMethodSignature (pool_data[type_index].utf8); |
58eb6e7c | 778 | |
7941ceab | 779 | _Jv_Utf8Const* name = pool_data[name_index].utf8; |
58eb6e7c AG |
780 | |
781 | if (this_tag != JV_CONSTANT_Fieldref | |
782 | && ( _Jv_equalUtf8Consts (name, clinit_name) | |
783 | || _Jv_equalUtf8Consts (name, init_name))) | |
784 | /* ignore */; | |
785 | else | |
f9edddab | 786 | verify_identifier (pool_data[name_index].utf8); |
58eb6e7c AG |
787 | } |
788 | ||
789 | _Jv_storeIndexes (&pool_data[index], class_index, nat_index); | |
790 | pool_tags[index] = this_tag; | |
791 | } | |
792 | break; | |
793 | ||
794 | case JV_CONSTANT_NameAndType: | |
795 | { | |
796 | _Jv_ushort name_index = get2u (this_data); | |
797 | _Jv_ushort type_index = get2u (this_data+2); | |
798 | ||
799 | check_tag (name_index, JV_CONSTANT_Utf8); | |
800 | prepare_pool_entry (name_index, JV_CONSTANT_Utf8); | |
801 | ||
802 | check_tag (type_index, JV_CONSTANT_Utf8); | |
803 | prepare_pool_entry (type_index, JV_CONSTANT_Utf8); | |
804 | ||
805 | _Jv_storeIndexes (&pool_data[index], name_index, type_index); | |
806 | pool_tags[index] = JV_CONSTANT_NameAndType; | |
807 | } | |
808 | break; | |
809 | ||
810 | case JV_CONSTANT_Float: | |
811 | { | |
a12fe13d | 812 | jfloat f = java::lang::Float::intBitsToFloat ((jint) get4 (this_data)); |
58eb6e7c AG |
813 | _Jv_storeFloat (&pool_data[index], f); |
814 | pool_tags[index] = JV_CONSTANT_Float; | |
815 | } | |
816 | break; | |
817 | ||
818 | case JV_CONSTANT_Integer: | |
819 | { | |
820 | int i = get4 (this_data); | |
821 | _Jv_storeInt (&pool_data[index], i); | |
822 | pool_tags[index] = JV_CONSTANT_Integer; | |
823 | } | |
824 | break; | |
825 | ||
826 | case JV_CONSTANT_Double: | |
827 | { | |
a12fe13d TT |
828 | jdouble d |
829 | = java::lang::Double::longBitsToDouble ((jlong) get8 (this_data)); | |
58eb6e7c AG |
830 | _Jv_storeDouble (&pool_data[index], d); |
831 | pool_tags[index] = JV_CONSTANT_Double; | |
832 | } | |
833 | break; | |
834 | ||
835 | case JV_CONSTANT_Long: | |
836 | { | |
837 | jlong i = get8 (this_data); | |
838 | _Jv_storeLong (&pool_data[index], i); | |
839 | pool_tags[index] = JV_CONSTANT_Long; | |
840 | } | |
841 | break; | |
842 | ||
843 | default: | |
844 | throw_class_format_error ("erroneous constant pool tag"); | |
845 | } | |
846 | } | |
847 | ||
848 | ||
849 | void | |
850 | _Jv_ClassReader::handleClassBegin | |
851 | (int access_flags, int this_class, int super_class) | |
852 | { | |
e409a2c8 TT |
853 | using namespace java::lang::reflect; |
854 | ||
58eb6e7c | 855 | unsigned char *pool_tags = (unsigned char*) def->constants.tags; |
7941ceab | 856 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
857 | |
858 | check_tag (this_class, JV_CONSTANT_Class); | |
7941ceab | 859 | _Jv_Utf8Const *loadedName = pool_data[this_class].utf8; |
58eb6e7c AG |
860 | |
861 | // was ClassLoader.defineClass called with an expected class name? | |
862 | if (def->name == 0) | |
863 | { | |
864 | jclass orig = _Jv_FindClassInCache (loadedName, def->loader); | |
865 | ||
866 | if (orig == 0) | |
867 | { | |
868 | def->name = loadedName; | |
869 | } | |
870 | else | |
871 | { | |
872 | jstring msg = JvNewStringUTF ("anonymous " | |
873 | "class data denotes " | |
874 | "existing class "); | |
875 | msg = msg->concat (orig->getName ()); | |
876 | ||
877 | throw_no_class_def_found_error (msg); | |
878 | } | |
879 | } | |
880 | ||
881 | // assert that the loaded class has the expected name, 5.3.5 | |
882 | else if (! _Jv_equalUtf8Consts (loadedName, def->name)) | |
883 | { | |
884 | jstring msg = JvNewStringUTF ("loaded class "); | |
885 | msg = msg->concat (def->getName ()); | |
886 | msg = msg->concat (_Jv_NewStringUTF (" was in fact named ")); | |
887 | jstring klass_name = _Jv_NewStringUTF (loadedName->data); | |
888 | msg = msg->concat (klass_name); | |
889 | ||
890 | throw_no_class_def_found_error (msg); | |
891 | } | |
892 | ||
a1aba4f9 | 893 | def->accflags = access_flags | java::lang::reflect::Modifier::INTERPRETED; |
7941ceab | 894 | pool_data[this_class].clazz = def; |
58eb6e7c AG |
895 | pool_tags[this_class] = JV_CONSTANT_ResolvedClass; |
896 | ||
04a704a4 | 897 | if (super_class == 0 && ! (access_flags & Modifier::INTERFACE)) |
58eb6e7c | 898 | { |
58eb6e7c | 899 | // FIXME: Consider this carefully! |
04a704a4 TT |
900 | if (! _Jv_equalUtf8Consts (def->name, java::lang::Object::class$.name)) |
901 | throw_no_class_def_found_error ("loading java.lang.Object"); | |
58eb6e7c AG |
902 | } |
903 | ||
904 | // In the pre-loading state, it can be looked up in the | |
905 | // cache only by this thread! This allows the super-class | |
906 | // to include references to this class. | |
907 | ||
908 | def->state = JV_STATE_PRELOADING; | |
107abb2f BM |
909 | |
910 | { | |
911 | JvSynchronize sync (&java::lang::Class::class$); | |
912 | _Jv_RegisterClass (def); | |
913 | } | |
58eb6e7c AG |
914 | |
915 | if (super_class != 0) | |
916 | { | |
04a704a4 | 917 | // Load the superclass. |
58eb6e7c | 918 | check_tag (super_class, JV_CONSTANT_Class); |
7941ceab | 919 | _Jv_Utf8Const* super_name = pool_data[super_class].utf8; |
58eb6e7c | 920 | |
04a704a4 | 921 | // Load the superclass using our defining loader. |
58eb6e7c AG |
922 | jclass the_super = _Jv_FindClass (super_name, |
923 | def->loader); | |
924 | ||
925 | // This will establish that we are allowed to be a subclass, | |
04a704a4 | 926 | // and check for class circularity error. |
58eb6e7c AG |
927 | checkExtends (def, the_super); |
928 | ||
04a704a4 TT |
929 | // Note: for an interface we will find Object as the |
930 | // superclass. We still check it above to ensure class file | |
931 | // validity, but we simply assign `null' to the actual field in | |
932 | // this case. | |
933 | def->superclass = (((access_flags & Modifier::INTERFACE)) | |
934 | ? NULL : the_super); | |
7941ceab | 935 | pool_data[super_class].clazz = the_super; |
58eb6e7c AG |
936 | pool_tags[super_class] = JV_CONSTANT_ResolvedClass; |
937 | } | |
6d8b1244 | 938 | |
04a704a4 TT |
939 | // Now we've come past the circularity problem, we can |
940 | // now say that we're loading. | |
58eb6e7c AG |
941 | |
942 | def->state = JV_STATE_LOADING; | |
943 | def->notifyAll (); | |
944 | } | |
945 | ||
946 | ///// implements the checks described in sect. 5.3.5.3 | |
947 | void | |
948 | _Jv_ClassReader::checkExtends (jclass sub, jclass super) | |
949 | { | |
e409a2c8 TT |
950 | using namespace java::lang::reflect; |
951 | ||
58eb6e7c | 952 | // having an interface or a final class as a superclass is no good |
e409a2c8 | 953 | if ((super->accflags & (Modifier::INTERFACE | Modifier::FINAL)) != 0) |
58eb6e7c AG |
954 | { |
955 | throw_incompatible_class_change_error (sub->getName ()); | |
956 | } | |
957 | ||
958 | // if the super class is not public, we need to check some more | |
e409a2c8 | 959 | if ((super->accflags & Modifier::PUBLIC) == 0) |
58eb6e7c AG |
960 | { |
961 | // With package scope, the classes must have the same | |
962 | // class loader. | |
963 | if ( sub->loader != super->loader | |
964 | || !_Jv_ClassNameSamePackage (sub->name, super->name)) | |
965 | { | |
966 | throw_incompatible_class_change_error (sub->getName ()); | |
967 | } | |
968 | } | |
969 | ||
970 | for (; super != 0; super = super->superclass) | |
971 | { | |
972 | if (super == sub) | |
973 | throw_class_circularity_error (sub->getName ()); | |
974 | } | |
975 | } | |
976 | ||
977 | ||
978 | ||
979 | void _Jv_ClassReader::handleInterfacesBegin (int count) | |
980 | { | |
3610e0d5 | 981 | def->interfaces = (jclass*) _Jv_AllocBytes (count*sizeof (jclass)); |
58eb6e7c AG |
982 | def->interface_count = count; |
983 | } | |
984 | ||
985 | void _Jv_ClassReader::handleInterface (int if_number, int offset) | |
986 | { | |
7941ceab | 987 | _Jv_word * pool_data = def->constants.data; |
58eb6e7c AG |
988 | unsigned char * pool_tags = (unsigned char*) def->constants.tags; |
989 | ||
990 | jclass the_interface; | |
991 | ||
992 | if (pool_tags[offset] == JV_CONSTANT_Class) | |
993 | { | |
7941ceab | 994 | _Jv_Utf8Const* name = pool_data[offset].utf8; |
58eb6e7c AG |
995 | the_interface = _Jv_FindClass (name, def->loader); |
996 | } | |
997 | else if (pool_tags[offset] == JV_CONSTANT_ResolvedClass) | |
998 | { | |
7941ceab | 999 | the_interface = pool_data[offset].clazz; |
58eb6e7c AG |
1000 | } |
1001 | else | |
1002 | { | |
1003 | throw_no_class_def_found_error ("erroneous constant pool tag"); | |
1004 | } | |
1005 | ||
1006 | // checks the validity of the_interface, and that we are in fact | |
1007 | // allowed to implement that interface. | |
1008 | checkImplements (def, the_interface); | |
1009 | ||
7941ceab | 1010 | pool_data[offset].clazz = the_interface; |
58eb6e7c AG |
1011 | pool_tags[offset] = JV_CONSTANT_ResolvedClass; |
1012 | ||
1013 | def->interfaces[if_number] = the_interface; | |
1014 | } | |
1015 | ||
1016 | void | |
1017 | _Jv_ClassReader::checkImplements (jclass sub, jclass super) | |
1018 | { | |
e409a2c8 TT |
1019 | using namespace java::lang::reflect; |
1020 | ||
58eb6e7c | 1021 | // well, it *must* be an interface |
e409a2c8 | 1022 | if ((super->accflags & Modifier::INTERFACE) == 0) |
58eb6e7c AG |
1023 | { |
1024 | throw_incompatible_class_change_error (sub->getName ()); | |
1025 | } | |
1026 | ||
1027 | // if it has package scope, it must also be defined by the | |
1028 | // same loader. | |
e409a2c8 | 1029 | if ((super->accflags & Modifier::PUBLIC) == 0) |
58eb6e7c AG |
1030 | { |
1031 | if ( sub->loader != super->loader | |
1032 | || !_Jv_ClassNameSamePackage (sub->name, super->name)) | |
1033 | { | |
1034 | throw_incompatible_class_change_error (sub->getName ()); | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | // FIXME: add interface circularity check here | |
1039 | if (sub == super) | |
1040 | { | |
1041 | throw_class_circularity_error (sub->getName ()); | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | void _Jv_ClassReader::handleFieldsBegin (int count) | |
1046 | { | |
1047 | def->fields = (_Jv_Field*) | |
3610e0d5 | 1048 | _Jv_AllocBytes (count * sizeof (_Jv_Field)); |
58eb6e7c AG |
1049 | def->field_count = count; |
1050 | def->field_initializers = (_Jv_ushort*) | |
3610e0d5 | 1051 | _Jv_AllocBytes (count * sizeof (_Jv_ushort)); |
58eb6e7c AG |
1052 | for (int i = 0; i < count; i++) |
1053 | def->field_initializers[i] = (_Jv_ushort) 0; | |
1054 | } | |
1055 | ||
1056 | void _Jv_ClassReader::handleField (int field_no, | |
1057 | int flags, | |
1058 | int name, | |
1059 | int desc) | |
1060 | { | |
e409a2c8 TT |
1061 | using namespace java::lang::reflect; |
1062 | ||
7941ceab | 1063 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
1064 | |
1065 | _Jv_Field *field = &def->fields[field_no]; | |
7941ceab | 1066 | _Jv_Utf8Const *field_name = pool_data[name].utf8; |
58eb6e7c AG |
1067 | |
1068 | #ifndef COMPACT_FIELDS | |
1069 | field->name = field_name; | |
1070 | #else | |
1071 | field->nameIndex = name; | |
1072 | #endif | |
1073 | ||
a47c20a7 | 1074 | // Ignore flags we don't know about. |
e409a2c8 | 1075 | field->flags = flags & Modifier::ALL_FLAGS; |
58eb6e7c | 1076 | |
a47c20a7 TT |
1077 | _Jv_Utf8Const* sig = pool_data[desc].utf8; |
1078 | ||
58eb6e7c AG |
1079 | if (verify) |
1080 | { | |
a47c20a7 TT |
1081 | verify_identifier (field_name); |
1082 | ||
1083 | for (int i = 0; i < field_no; ++i) | |
1084 | { | |
1085 | if (_Jv_equalUtf8Consts (field_name, def->fields[i].name) | |
1086 | && _Jv_equalUtf8Consts (sig, | |
1087 | // We know the other fields are | |
1088 | // unresolved. | |
1089 | (_Jv_Utf8Const *) def->fields[i].type)) | |
1090 | throw_class_format_error ("duplicate field name"); | |
1091 | } | |
1092 | ||
e409a2c8 TT |
1093 | if (field->flags & (Modifier::SYNCHRONIZED |
1094 | | Modifier::NATIVE | |
1095 | | Modifier::INTERFACE | |
1096 | | Modifier::ABSTRACT)) | |
58eb6e7c AG |
1097 | throw_class_format_error ("erroneous field access flags"); |
1098 | ||
e409a2c8 TT |
1099 | if (1 < ( ((field->flags & Modifier::PUBLIC) ? 1 : 0) |
1100 | +((field->flags & Modifier::PRIVATE) ? 1 : 0) | |
1101 | +((field->flags & Modifier::PROTECTED) ? 1 : 0))) | |
58eb6e7c AG |
1102 | throw_class_format_error ("erroneous field access flags"); |
1103 | } | |
1104 | ||
58eb6e7c AG |
1105 | if (verify) |
1106 | _Jv_VerifyFieldSignature (sig); | |
1107 | ||
1108 | // field->type is really a jclass, but while it is still | |
1109 | // unresolved we keep an _Jv_Utf8Const* instead. | |
1110 | field->type = (jclass) sig; | |
1111 | field->flags |= _Jv_FIELD_UNRESOLVED_FLAG; | |
1112 | field->u.boffset = 0; | |
1113 | } | |
1114 | ||
1115 | ||
1116 | void _Jv_ClassReader::handleConstantValueAttribute (int field_index, | |
1117 | int value) | |
1118 | { | |
e409a2c8 TT |
1119 | using namespace java::lang::reflect; |
1120 | ||
58eb6e7c AG |
1121 | _Jv_Field *field = &def->fields[field_index]; |
1122 | ||
e409a2c8 TT |
1123 | if ((field->flags & (Modifier::STATIC |
1124 | | Modifier::FINAL | |
1125 | | Modifier::PRIVATE)) == 0) | |
58eb6e7c AG |
1126 | { |
1127 | // Ignore, as per vmspec #4.7.2 | |
1128 | return; | |
1129 | } | |
1130 | ||
1131 | // do not allow multiple constant fields! | |
1132 | if (field->flags & _Jv_FIELD_CONSTANT_VALUE) | |
1133 | throw_class_format_error ("field has multiple ConstantValue attributes"); | |
1134 | ||
1135 | field->flags |= _Jv_FIELD_CONSTANT_VALUE; | |
1136 | def->field_initializers[field_index] = value; | |
1137 | ||
1138 | /* type check the initializer */ | |
1139 | ||
1140 | if (value <= 0 || value >= pool_count) | |
1141 | throw_class_format_error ("erroneous ConstantValue attribute"); | |
1142 | ||
1143 | /* FIXME: do the rest */ | |
1144 | } | |
1145 | ||
1146 | void _Jv_ClassReader::handleFieldsEnd () | |
1147 | { | |
e409a2c8 TT |
1148 | using namespace java::lang::reflect; |
1149 | ||
58eb6e7c AG |
1150 | // We need to reorganize the fields so that the static ones are first, |
1151 | // to conform to GCJ class layout. | |
1152 | ||
1153 | int low = 0; | |
1154 | int high = def->field_count-1; | |
1155 | _Jv_Field *fields = def->fields; | |
1156 | _Jv_ushort *inits = def->field_initializers; | |
1157 | ||
1158 | // this is kind of a raw version of quicksort. | |
1159 | while (low < high) | |
1160 | { | |
1161 | // go forward on low, while it's a static | |
e409a2c8 | 1162 | while (low < high && (fields[low].flags & Modifier::STATIC) != 0) |
58eb6e7c AG |
1163 | low++; |
1164 | ||
1165 | // go backwards on high, while it's a non-static | |
e409a2c8 | 1166 | while (low < high && (fields[high].flags & Modifier::STATIC) == 0) |
58eb6e7c AG |
1167 | high--; |
1168 | ||
1169 | if (low==high) | |
1170 | break; | |
1171 | ||
1172 | _Jv_Field tmp = fields[low]; | |
1173 | _Jv_ushort itmp = inits[low]; | |
1174 | ||
1175 | fields[low] = fields[high]; | |
1176 | inits[low] = inits[high]; | |
1177 | ||
1178 | fields[high] = tmp; | |
1179 | inits[high] = itmp; | |
1180 | ||
1181 | high -= 1; | |
1182 | low += 1; | |
1183 | } | |
1184 | ||
e409a2c8 | 1185 | if ((fields[low].flags & Modifier::STATIC) != 0) |
58eb6e7c AG |
1186 | low += 1; |
1187 | ||
1188 | def->static_field_count = low; | |
1189 | } | |
1190 | ||
1191 | ||
1192 | ||
facc279f TT |
1193 | void |
1194 | _Jv_ClassReader::handleMethodsBegin (int count) | |
58eb6e7c | 1195 | { |
eaa2834f | 1196 | def->methods = (_Jv_Method *) _Jv_AllocBytes (sizeof (_Jv_Method) * count); |
58eb6e7c | 1197 | |
facc279f | 1198 | def->interpreted_methods |
3610e0d5 TT |
1199 | = (_Jv_MethodBase **) _Jv_AllocBytes (sizeof (_Jv_MethodBase *) |
1200 | * count); | |
58eb6e7c AG |
1201 | |
1202 | for (int i = 0; i < count; i++) | |
eaa2834f TT |
1203 | { |
1204 | def->interpreted_methods[i] = 0; | |
1205 | def->methods[i].index = (_Jv_ushort) -1; | |
1206 | } | |
58eb6e7c AG |
1207 | |
1208 | def->method_count = count; | |
1209 | } | |
1210 | ||
1211 | ||
1212 | void _Jv_ClassReader::handleMethod | |
1213 | (int mth_index, int accflags, int name, int desc) | |
1214 | { | |
e409a2c8 TT |
1215 | using namespace java::lang::reflect; |
1216 | ||
7941ceab | 1217 | _Jv_word *pool_data = def->constants.data; |
58eb6e7c AG |
1218 | _Jv_Method *method = &def->methods[mth_index]; |
1219 | ||
1220 | check_tag (name, JV_CONSTANT_Utf8); | |
1221 | prepare_pool_entry (name, JV_CONSTANT_Utf8); | |
7941ceab | 1222 | method->name = pool_data[name].utf8; |
58eb6e7c AG |
1223 | |
1224 | check_tag (desc, JV_CONSTANT_Utf8); | |
1225 | prepare_pool_entry (desc, JV_CONSTANT_Utf8); | |
7941ceab | 1226 | method->signature = pool_data[desc].utf8; |
58eb6e7c AG |
1227 | |
1228 | // ignore unknown flags | |
e409a2c8 | 1229 | method->accflags = accflags & Modifier::ALL_FLAGS; |
58eb6e7c AG |
1230 | |
1231 | // intialize... | |
1232 | method->ncode = 0; | |
224b7b7b | 1233 | method->throws = NULL; |
58eb6e7c AG |
1234 | |
1235 | if (verify) | |
1236 | { | |
1237 | if (_Jv_equalUtf8Consts (method->name, clinit_name) | |
1238 | || _Jv_equalUtf8Consts (method->name, init_name)) | |
1239 | /* ignore */; | |
1240 | else | |
f9edddab | 1241 | verify_identifier (method->name); |
58eb6e7c AG |
1242 | |
1243 | _Jv_VerifyMethodSignature (method->signature); | |
1244 | ||
a47c20a7 TT |
1245 | for (int i = 0; i < mth_index; ++i) |
1246 | { | |
1247 | if (_Jv_equalUtf8Consts (method->name, def->methods[i].name) | |
1248 | && _Jv_equalUtf8Consts (method->signature, | |
1249 | def->methods[i].signature)) | |
1250 | throw_class_format_error ("duplicate method"); | |
1251 | } | |
1252 | ||
e409a2c8 TT |
1253 | if (method->accflags & (Modifier::VOLATILE |
1254 | | Modifier::TRANSIENT | |
1255 | | Modifier::INTERFACE)) | |
58eb6e7c AG |
1256 | throw_class_format_error ("erroneous method access flags"); |
1257 | ||
e409a2c8 TT |
1258 | if (1 < ( ((method->accflags & Modifier::PUBLIC) ? 1 : 0) |
1259 | +((method->accflags & Modifier::PRIVATE) ? 1 : 0) | |
1260 | +((method->accflags & Modifier::PROTECTED) ? 1 : 0))) | |
58eb6e7c AG |
1261 | throw_class_format_error ("erroneous method access flags"); |
1262 | } | |
1263 | } | |
1264 | ||
1265 | void _Jv_ClassReader::handleCodeAttribute | |
1266 | (int method_index, int max_stack, int max_locals, | |
1267 | int code_start, int code_length, int exc_table_length) | |
1268 | { | |
1269 | int size = _Jv_InterpMethod::size (exc_table_length, code_length); | |
1270 | _Jv_InterpMethod *method = | |
3610e0d5 | 1271 | (_Jv_InterpMethod*) (_Jv_AllocBytes (size)); |
58eb6e7c | 1272 | |
90471585 | 1273 | method->deferred = NULL; |
58eb6e7c AG |
1274 | method->max_stack = max_stack; |
1275 | method->max_locals = max_locals; | |
1276 | method->code_length = code_length; | |
1277 | method->exc_count = exc_table_length; | |
1278 | method->defining_class = def; | |
1279 | method->self = &def->methods[method_index]; | |
fdae83ab | 1280 | method->prepared = NULL; |
58eb6e7c AG |
1281 | |
1282 | // grab the byte code! | |
1283 | memcpy ((void*) method->bytecode (), | |
1284 | (void*) (bytes+code_start), | |
1285 | code_length); | |
a12fe13d | 1286 | |
58eb6e7c | 1287 | def->interpreted_methods[method_index] = method; |
4c98b1b0 TT |
1288 | |
1289 | if ((method->self->accflags & java::lang::reflect::Modifier::STATIC)) | |
1290 | { | |
1291 | // Precompute the ncode field for a static method. This lets us | |
1292 | // call a static method of an interpreted class from precompiled | |
1293 | // code without first resolving the class (that will happen | |
1294 | // during class initialization instead). | |
1295 | method->self->ncode = method->ncode (); | |
1296 | } | |
58eb6e7c AG |
1297 | } |
1298 | ||
fdae83ab | 1299 | void _Jv_ClassReader::handleExceptionTableEntry |
58eb6e7c AG |
1300 | (int method_index, int exc_index, |
1301 | int start_pc, int end_pc, int handler_pc, int catch_type) | |
1302 | { | |
facc279f TT |
1303 | _Jv_InterpMethod *method = reinterpret_cast<_Jv_InterpMethod *> |
1304 | (def->interpreted_methods[method_index]); | |
58eb6e7c AG |
1305 | _Jv_InterpException *exc = method->exceptions (); |
1306 | ||
fdae83ab TT |
1307 | exc[exc_index].start_pc.i = start_pc; |
1308 | exc[exc_index].end_pc.i = end_pc; | |
1309 | exc[exc_index].handler_pc.i = handler_pc; | |
1310 | exc[exc_index].handler_type.i = catch_type; | |
58eb6e7c AG |
1311 | } |
1312 | ||
1313 | void _Jv_ClassReader::handleMethodsEnd () | |
1314 | { | |
e409a2c8 TT |
1315 | using namespace java::lang::reflect; |
1316 | ||
58eb6e7c AG |
1317 | for (int i = 0; i < def->method_count; i++) |
1318 | { | |
1319 | _Jv_Method *method = &def->methods[i]; | |
facc279f TT |
1320 | if ((method->accflags & Modifier::NATIVE) != 0) |
1321 | { | |
1322 | if (def->interpreted_methods[i] != 0) | |
1323 | throw_class_format_error ("code provided for native method"); | |
1324 | else | |
1325 | { | |
1326 | _Jv_JNIMethod *m = (_Jv_JNIMethod *) | |
3610e0d5 | 1327 | _Jv_AllocBytes (sizeof (_Jv_JNIMethod)); |
facc279f TT |
1328 | m->defining_class = def; |
1329 | m->self = method; | |
1330 | m->function = NULL; | |
1331 | def->interpreted_methods[i] = m; | |
90471585 | 1332 | m->deferred = NULL; |
4c98b1b0 TT |
1333 | |
1334 | if ((method->accflags & Modifier::STATIC)) | |
1335 | { | |
1336 | // Precompute the ncode field for a static method. | |
1337 | // This lets us call a static method of an | |
1338 | // interpreted class from precompiled code without | |
1339 | // first resolving the class (that will happen | |
1340 | // during class initialization instead). | |
1341 | method->ncode = m->ncode (); | |
1342 | } | |
facc279f TT |
1343 | } |
1344 | } | |
1345 | else if ((method->accflags & Modifier::ABSTRACT) != 0) | |
58eb6e7c AG |
1346 | { |
1347 | if (def->interpreted_methods[i] != 0) | |
facc279f | 1348 | throw_class_format_error ("code provided for abstract method"); |
58eb6e7c AG |
1349 | } |
1350 | else | |
1351 | { | |
1352 | if (def->interpreted_methods[i] == 0) | |
facc279f | 1353 | throw_class_format_error ("method with no code"); |
58eb6e7c AG |
1354 | } |
1355 | } | |
58eb6e7c AG |
1356 | } |
1357 | ||
f9edddab PB |
1358 | void _Jv_ClassReader::throw_class_format_error (char *msg) |
1359 | { | |
1360 | jstring str; | |
1361 | if (def->name != NULL) | |
1362 | { | |
1363 | jsize mlen = strlen (msg); | |
1364 | unsigned char* data = (unsigned char*) def->name->data; | |
1365 | int ulen = def->name->length; | |
1366 | unsigned char* limit = data + ulen; | |
1367 | jsize nlen = _Jv_strLengthUtf8 ((char *) data, ulen); | |
1368 | jsize len = nlen + mlen + 3; | |
1369 | str = JvAllocString(len); | |
1370 | jchar *chrs = JvGetStringChars(str); | |
1371 | while (data < limit) | |
1372 | *chrs++ = UTF8_GET(data, limit); | |
1373 | *chrs++ = ' '; | |
1374 | *chrs++ = '('; | |
1375 | for (;;) | |
1376 | { | |
1377 | char c = *msg++; | |
1378 | if (c == 0) | |
1379 | break; | |
1380 | *chrs++ = c & 0xFFFF; | |
1381 | } | |
1382 | *chrs++ = ')'; | |
1383 | } | |
1384 | else | |
1385 | str = JvNewStringLatin1 (msg); | |
1386 | ::throw_class_format_error (str); | |
1387 | } | |
58eb6e7c | 1388 | \f |
bea31ffb TT |
1389 | /** Here we define the exceptions that can be thrown */ |
1390 | ||
1391 | static void | |
1392 | throw_no_class_def_found_error (jstring msg) | |
1393 | { | |
1394 | throw (msg | |
1395 | ? new java::lang::NoClassDefFoundError (msg) | |
1396 | : new java::lang::NoClassDefFoundError); | |
1397 | } | |
1398 | ||
1399 | static void | |
1400 | throw_no_class_def_found_error (char *msg) | |
1401 | { | |
1402 | throw_no_class_def_found_error (JvNewStringLatin1 (msg)); | |
1403 | } | |
1404 | ||
1405 | static void | |
1406 | throw_class_format_error (jstring msg) | |
1407 | { | |
1408 | throw (msg | |
1409 | ? new java::lang::ClassFormatError (msg) | |
1410 | : new java::lang::ClassFormatError); | |
1411 | } | |
1412 | ||
1413 | static void | |
1414 | throw_internal_error (char *msg) | |
1415 | { | |
1416 | throw new java::lang::InternalError (JvNewStringLatin1 (msg)); | |
1417 | } | |
1418 | ||
eaa2834f TT |
1419 | static void |
1420 | throw_incompatible_class_change_error (jstring msg) | |
bea31ffb TT |
1421 | { |
1422 | throw new java::lang::IncompatibleClassChangeError (msg); | |
1423 | } | |
1424 | ||
eaa2834f TT |
1425 | static void |
1426 | throw_class_circularity_error (jstring msg) | |
bea31ffb TT |
1427 | { |
1428 | throw new java::lang::ClassCircularityError (msg); | |
1429 | } | |
1430 | ||
1431 | #endif /* INTERPRETER */ | |
1432 | ||
1433 | \f | |
1434 | ||
58eb6e7c AG |
1435 | /** This section takes care of verifying integrity of identifiers, |
1436 | signatures, field ddescriptors, and class names */ | |
1437 | ||
1438 | #define UTF8_PEEK(PTR, LIMIT) \ | |
1439 | ({ unsigned char* xxkeep = (PTR); \ | |
1440 | int xxch = UTF8_GET(PTR,LIMIT); \ | |
1441 | PTR = xxkeep; xxch; }) | |
1442 | ||
bea31ffb | 1443 | /* Verify one element of a type descriptor or signature. */ |
58eb6e7c AG |
1444 | static unsigned char* |
1445 | _Jv_VerifyOne (unsigned char* ptr, unsigned char* limit, bool void_ok) | |
1446 | { | |
1447 | if (ptr >= limit) | |
1448 | return 0; | |
1449 | ||
1450 | int ch = UTF8_GET (ptr, limit); | |
1451 | ||
1452 | switch (ch) | |
1453 | { | |
1454 | case 'V': | |
bea31ffb TT |
1455 | if (! void_ok) |
1456 | return 0; | |
58eb6e7c AG |
1457 | |
1458 | case 'S': case 'B': case 'I': case 'J': | |
1459 | case 'Z': case 'C': case 'F': case 'D': | |
1460 | break; | |
1461 | ||
1462 | case 'L': | |
1463 | { | |
1464 | unsigned char *start = ptr, *end; | |
bea31ffb TT |
1465 | do |
1466 | { | |
1467 | if (ptr > limit) | |
1468 | return 0; | |
1469 | ||
1470 | end = ptr; | |
1471 | ||
1472 | if ((ch = UTF8_GET (ptr, limit)) == -1) | |
1473 | return 0; | |
1474 | ||
1475 | } | |
1476 | while (ch != ';'); | |
f9edddab PB |
1477 | if (! _Jv_VerifyClassName (start, (unsigned short) (end-start))) |
1478 | return 0; | |
58eb6e7c AG |
1479 | } |
1480 | break; | |
1481 | ||
1482 | case '[': | |
1483 | return _Jv_VerifyOne (ptr, limit, false); | |
1484 | break; | |
bea31ffb | 1485 | |
58eb6e7c AG |
1486 | default: |
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | return ptr; | |
58eb6e7c AG |
1491 | } |
1492 | ||
bea31ffb | 1493 | /* Verification and loading procedures. */ |
f9edddab | 1494 | bool |
58eb6e7c AG |
1495 | _Jv_VerifyFieldSignature (_Jv_Utf8Const*sig) |
1496 | { | |
1497 | unsigned char* ptr = (unsigned char*) sig->data; | |
1498 | unsigned char* limit = ptr + sig->length; | |
1499 | ||
1500 | ptr = _Jv_VerifyOne (ptr, limit, false); | |
1501 | ||
f9edddab | 1502 | return ptr == limit; |
58eb6e7c AG |
1503 | } |
1504 | ||
f9edddab | 1505 | bool |
58eb6e7c AG |
1506 | _Jv_VerifyMethodSignature (_Jv_Utf8Const*sig) |
1507 | { | |
1508 | unsigned char* ptr = (unsigned char*) sig->data; | |
1509 | unsigned char* limit = ptr + sig->length; | |
1510 | ||
f9edddab PB |
1511 | if (ptr == limit || UTF8_GET(ptr,limit) != '(') |
1512 | return false; | |
58eb6e7c AG |
1513 | |
1514 | while (ptr && UTF8_PEEK (ptr, limit) != ')') | |
1515 | ptr = _Jv_VerifyOne (ptr, limit, false); | |
bea31ffb | 1516 | |
58eb6e7c | 1517 | if (UTF8_GET (ptr, limit) != ')') |
f9edddab | 1518 | return false; |
58eb6e7c AG |
1519 | |
1520 | // get the return type | |
1521 | ptr = _Jv_VerifyOne (ptr, limit, true); | |
1522 | ||
f9edddab | 1523 | return ptr == limit; |
58eb6e7c AG |
1524 | } |
1525 | ||
bea31ffb TT |
1526 | /* We try to avoid calling the Character methods all the time, in |
1527 | fact, they will only be called for non-standard things. */ | |
58eb6e7c AG |
1528 | static __inline__ int |
1529 | is_identifier_start (int c) | |
1530 | { | |
1531 | unsigned int ch = (unsigned)c; | |
1532 | ||
1533 | if ((ch - 0x41U) < 29U) /* A ... Z */ | |
1534 | return 1; | |
1535 | if ((ch - 0x61U) < 29U) /* a ... z */ | |
1536 | return 1; | |
1537 | if (ch == 0x5FU) /* _ */ | |
1538 | return 1; | |
1539 | ||
82ae7822 | 1540 | return java::lang::Character::isJavaIdentifierStart ((jchar) ch); |
58eb6e7c AG |
1541 | } |
1542 | ||
1543 | static __inline__ int | |
1544 | is_identifier_part (int c) | |
1545 | { | |
1546 | unsigned int ch = (unsigned)c; | |
1547 | ||
1548 | if ((ch - 0x41U) < 29U) /* A ... Z */ | |
1549 | return 1; | |
1550 | if ((ch - 0x61U) < 29U) /* a ... z */ | |
1551 | return 1; | |
1552 | if ((ch - 0x30) < 10U) /* 0 .. 9 */ | |
1553 | return 1; | |
1554 | if (ch == 0x5FU || ch == 0x24U) /* _ $ */ | |
1555 | return 1; | |
1556 | ||
82ae7822 | 1557 | return java::lang::Character::isJavaIdentifierStart ((jchar) ch); |
58eb6e7c AG |
1558 | } |
1559 | ||
f9edddab | 1560 | bool |
58eb6e7c AG |
1561 | _Jv_VerifyIdentifier (_Jv_Utf8Const* name) |
1562 | { | |
1563 | unsigned char *ptr = (unsigned char*) name->data; | |
1564 | unsigned char *limit = ptr + name->length; | |
1565 | int ch; | |
1566 | ||
1567 | if ((ch = UTF8_GET (ptr, limit))==-1 | |
1568 | || ! is_identifier_start (ch)) | |
f9edddab | 1569 | return false; |
58eb6e7c AG |
1570 | |
1571 | while (ptr != limit) | |
1572 | { | |
1573 | if ((ch = UTF8_GET (ptr, limit))==-1 | |
1574 | || ! is_identifier_part (ch)) | |
f9edddab | 1575 | return false; |
58eb6e7c | 1576 | } |
f9edddab | 1577 | return true; |
58eb6e7c AG |
1578 | } |
1579 | ||
f9edddab | 1580 | bool |
58eb6e7c AG |
1581 | _Jv_VerifyClassName (unsigned char* ptr, _Jv_ushort length) |
1582 | { | |
1583 | unsigned char *limit = ptr+length; | |
1584 | int ch; | |
1585 | ||
e3253af5 AG |
1586 | if ('[' == UTF8_PEEK (ptr, limit)) |
1587 | { | |
bea31ffb TT |
1588 | unsigned char *end = _Jv_VerifyOne (++ptr, limit, false); |
1589 | // _Jv_VerifyOne must leave us looking at the terminating nul | |
1590 | // byte. | |
1591 | if (! end || *end) | |
f9edddab | 1592 | return false; |
e3253af5 | 1593 | else |
f9edddab | 1594 | return true; |
e3253af5 AG |
1595 | } |
1596 | ||
58eb6e7c | 1597 | next_level: |
f9edddab | 1598 | for (;;) { |
58eb6e7c | 1599 | if ((ch = UTF8_GET (ptr, limit))==-1) |
f9edddab | 1600 | return false; |
58eb6e7c | 1601 | if (! is_identifier_start (ch)) |
f9edddab PB |
1602 | return false; |
1603 | for (;;) { | |
58eb6e7c | 1604 | if (ptr == limit) |
f9edddab | 1605 | return true; |
58eb6e7c | 1606 | else if ((ch = UTF8_GET (ptr, limit))==-1) |
f9edddab | 1607 | return false; |
58eb6e7c AG |
1608 | else if (ch == '.') |
1609 | goto next_level; | |
1610 | else if (! is_identifier_part (ch)) | |
f9edddab PB |
1611 | return false; |
1612 | } | |
1613 | } | |
58eb6e7c AG |
1614 | } |
1615 | ||
f9edddab | 1616 | bool |
58eb6e7c AG |
1617 | _Jv_VerifyClassName (_Jv_Utf8Const *name) |
1618 | { | |
f9edddab PB |
1619 | return _Jv_VerifyClassName ((unsigned char*)&name->data[0], |
1620 | (_Jv_ushort) name->length); | |
58eb6e7c AG |
1621 | } |
1622 | ||
bea31ffb TT |
1623 | /* Returns true, if NAME1 and NAME2 represent classes in the same |
1624 | package. */ | |
58eb6e7c AG |
1625 | bool |
1626 | _Jv_ClassNameSamePackage (_Jv_Utf8Const *name1, _Jv_Utf8Const *name2) | |
1627 | { | |
1628 | unsigned char* ptr1 = (unsigned char*) name1->data; | |
1629 | unsigned char* limit1 = ptr1 + name1->length; | |
1630 | ||
1631 | unsigned char* last1 = ptr1; | |
1632 | ||
1633 | // scan name1, and find the last occurrence of '.' | |
1634 | while (ptr1 < limit1) { | |
1635 | int ch1 = UTF8_GET (ptr1, limit1); | |
1636 | ||
1637 | if (ch1 == '.') | |
1638 | last1 = ptr1; | |
bea31ffb | 1639 | |
58eb6e7c AG |
1640 | else if (ch1 == -1) |
1641 | return false; | |
1642 | } | |
1643 | ||
bea31ffb | 1644 | // Now the length of NAME1's package name is LEN. |
58eb6e7c AG |
1645 | int len = last1 - (unsigned char*) name1->data; |
1646 | ||
bea31ffb | 1647 | // If this is longer than NAME2, then we're off. |
58eb6e7c AG |
1648 | if (len > name2->length) |
1649 | return false; | |
1650 | ||
bea31ffb | 1651 | // Then compare the first len bytes for equality. |
58eb6e7c AG |
1652 | if (memcmp ((void*) name1->data, (void*) name2->data, len) == 0) |
1653 | { | |
bea31ffb | 1654 | // Check that there are no .'s after position LEN in NAME2. |
58eb6e7c AG |
1655 | |
1656 | unsigned char* ptr2 = (unsigned char*) name2->data + len; | |
1657 | unsigned char* limit2 = | |
1658 | (unsigned char*) name2->data + name2->length; | |
1659 | ||
1660 | while (ptr2 < limit2) | |
1661 | { | |
1662 | int ch2 = UTF8_GET (ptr2, limit2); | |
1663 | if (ch2 == -1 || ch2 == '.') | |
1664 | return false; | |
1665 | } | |
1666 | return true; | |
1667 | } | |
1668 | return false; | |
1669 | } |