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36739040 | 1 | /* Glue to interface gcj with bytecode verifier. |
5624e564 | 2 | Copyright (C) 2003-2015 Free Software Foundation, Inc. |
36739040 TT |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8328d52a | 8 | the Free Software Foundation; either version 3, or (at your option) |
36739040 TT |
9 | any later version. |
10 | ||
11 | GCC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
8328d52a NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. | |
36739040 TT |
19 | |
20 | Java and all Java-based marks are trademarks or registered trademarks | |
21 | of Sun Microsystems, Inc. in the United States and other countries. | |
22 | The Free Software Foundation is independent of Sun Microsystems, Inc. */ | |
23 | ||
24 | /* Written by Tom Tromey <tromey@redhat.com>. */ | |
25 | ||
26 | #include "config.h" | |
27 | ||
28 | #include "system.h" | |
29 | #include "coretypes.h" | |
40e23961 | 30 | #include "alias.h" |
36739040 | 31 | #include "tree.h" |
c7131fb2 | 32 | #include "options.h" |
d8a2d370 | 33 | #include "stringpool.h" |
36739040 TT |
34 | #include "parse.h" |
35 | ||
36 | #include "verify.h" | |
37 | #include "java-tree.h" | |
38 | #include "java-except.h" | |
718f9c0f | 39 | #include "diagnostic-core.h" |
36739040 TT |
40 | |
41 | void * | |
42 | vfy_alloc (size_t bytes) | |
43 | { | |
44 | return xmalloc (bytes); | |
45 | } | |
46 | ||
47 | void | |
48 | vfy_free (void *mem) | |
49 | { | |
50 | free (mem); | |
51 | } | |
52 | ||
53 | bool | |
54 | vfy_strings_equal (vfy_string one, vfy_string two) | |
55 | { | |
56 | return one == two; | |
57 | } | |
58 | ||
59 | const char * | |
60 | vfy_string_bytes (vfy_string str) | |
61 | { | |
62 | return IDENTIFIER_POINTER (str); | |
63 | } | |
64 | ||
65 | int | |
66 | vfy_string_length (vfy_string str) | |
67 | { | |
68 | return IDENTIFIER_LENGTH (str); | |
69 | } | |
70 | ||
71 | vfy_string | |
eb9744a7 | 72 | vfy_init_name (void) |
36739040 TT |
73 | { |
74 | return init_identifier_node; | |
75 | } | |
76 | ||
77 | vfy_string | |
eb9744a7 | 78 | vfy_clinit_name (void) |
36739040 TT |
79 | { |
80 | return clinit_identifier_node; | |
81 | } | |
82 | ||
83 | static const char* | |
84 | skip_one_type (const char* ptr) | |
85 | { | |
86 | int ch = *ptr++; | |
87 | ||
88 | while (ch == '[') | |
89 | { | |
90 | ch = *ptr++; | |
91 | } | |
92 | ||
93 | if (ch == 'L') | |
94 | { | |
95 | do { ch = *ptr++; } while (ch != ';'); | |
96 | } | |
97 | ||
98 | return ptr; | |
99 | } | |
100 | ||
101 | int | |
102 | vfy_count_arguments (vfy_string signature) | |
103 | { | |
104 | const char *ptr = IDENTIFIER_POINTER (signature); | |
105 | int arg_count = 0; | |
106 | ||
107 | /* Skip '('. */ | |
108 | ptr++; | |
109 | ||
110 | /* Count args. */ | |
111 | while (*ptr != ')') | |
112 | { | |
113 | ptr = skip_one_type (ptr); | |
114 | arg_count += 1; | |
115 | } | |
116 | ||
117 | return arg_count; | |
118 | } | |
119 | ||
120 | vfy_string | |
121 | vfy_get_string (const char *s, int len) | |
122 | { | |
123 | return get_identifier_with_length (s, len); | |
124 | } | |
125 | ||
126 | vfy_string | |
127 | vfy_get_signature (vfy_method *method) | |
128 | { | |
129 | return method->signature; | |
130 | } | |
131 | ||
132 | vfy_string | |
133 | vfy_get_method_name (vfy_method *method) | |
134 | { | |
135 | return method->name; | |
136 | } | |
137 | ||
138 | bool | |
139 | vfy_is_static (vfy_method *method) | |
140 | { | |
141 | return METHOD_STATIC (method->method); | |
142 | } | |
143 | ||
144 | const unsigned char * | |
145 | vfy_get_bytecode (vfy_method *method) | |
146 | { | |
147 | return method->bytes; | |
148 | } | |
149 | ||
150 | vfy_exception * | |
151 | vfy_get_exceptions (vfy_method *method) | |
152 | { | |
153 | return method->exceptions; | |
154 | } | |
155 | ||
156 | void | |
157 | vfy_get_exception (vfy_exception *exceptions, int index, int *handler, | |
158 | int *start, int *end, int *handler_type) | |
159 | { | |
160 | *handler = exceptions[index].handler; | |
161 | *start = exceptions[index].start; | |
162 | *end = exceptions[index].end; | |
163 | *handler_type = exceptions[index].type; | |
164 | } | |
165 | ||
166 | int | |
167 | vfy_tag (vfy_constants *pool, int index) | |
168 | { | |
169 | int result = JPOOL_TAG (pool, index); | |
170 | /* gcj will resolve constant pool entries other than string and | |
171 | class references. The verifier doesn't care about the values, so | |
172 | we just strip off the resolved flag. */ | |
173 | if ((result & CONSTANT_ResolvedFlag) != 0 | |
174 | && result != CONSTANT_ResolvedString | |
175 | && result != CONSTANT_ResolvedClass) | |
176 | result &= ~ CONSTANT_ResolvedFlag; | |
177 | return result; | |
178 | } | |
179 | ||
180 | void | |
181 | vfy_load_indexes (vfy_constants *pool, int index, | |
182 | vfy_uint_16 *index0, vfy_uint_16 *index1) | |
183 | { | |
184 | *index0 = JPOOL_USHORT1 (pool, index); | |
185 | *index1 = JPOOL_USHORT2 (pool, index); | |
186 | } | |
187 | ||
188 | vfy_constants * | |
189 | vfy_get_constants (vfy_jclass klass) | |
190 | { | |
191 | return TYPE_JCF (klass); | |
192 | } | |
193 | ||
194 | int | |
195 | vfy_get_constants_size (vfy_jclass klass) | |
196 | { | |
197 | return JPOOL_SIZE (TYPE_JCF (klass)); | |
198 | } | |
199 | ||
200 | vfy_string | |
201 | vfy_get_pool_string (vfy_constants *pool, int index) | |
202 | { | |
203 | return get_name_constant (pool, index); | |
204 | } | |
205 | ||
206 | vfy_jclass | |
207 | vfy_get_pool_class (vfy_constants *pool, int index) | |
208 | { | |
209 | vfy_jclass k; | |
210 | k = get_class_constant (pool, index); | |
211 | return k; | |
212 | } | |
213 | ||
36739040 TT |
214 | vfy_string |
215 | vfy_get_class_name (vfy_jclass klass) | |
216 | { | |
217 | return DECL_NAME (TYPE_NAME (klass)); | |
218 | } | |
219 | ||
220 | bool | |
221 | vfy_is_assignable_from (vfy_jclass target, vfy_jclass source) | |
222 | { | |
36739040 TT |
223 | /* Any class is always assignable to itself, or java.lang.Object. */ |
224 | if (source == target || target == object_type_node) | |
225 | return true; | |
226 | ||
a2da2c9a BM |
227 | /* For the C++ ABI, perform this test statically. */ |
228 | if (! flag_indirect_dispatch) | |
229 | return can_widen_reference_to (source, target); | |
230 | ||
231 | /* For the BC-ABI, we assume at compile time that reference types are always | |
232 | compatible. However, a type assertion table entry is emitted so that the | |
233 | runtime can detect binary-incompatible changes. */ | |
234 | ||
36739040 TT |
235 | add_type_assertion (current_class, JV_ASSERT_TYPES_COMPATIBLE, source, |
236 | target); | |
237 | return true; | |
238 | } | |
239 | ||
240 | char | |
241 | vfy_get_primitive_char (vfy_jclass klass) | |
242 | { | |
243 | tree sig; | |
ab184b2a | 244 | gcc_assert (vfy_is_primitive (klass)); |
36739040 TT |
245 | sig = build_java_signature (klass); |
246 | return (IDENTIFIER_POINTER (sig))[0]; | |
247 | } | |
248 | ||
36739040 TT |
249 | bool |
250 | vfy_is_array (vfy_jclass klass) | |
251 | { | |
252 | return TYPE_ARRAY_P (klass); | |
253 | } | |
254 | ||
255 | bool | |
256 | vfy_is_interface (vfy_jclass klass) | |
257 | { | |
258 | return CLASS_INTERFACE (TYPE_NAME (klass)); | |
259 | } | |
260 | ||
261 | bool | |
262 | vfy_is_primitive (vfy_jclass klass) | |
263 | { | |
264 | return JPRIMITIVE_TYPE_P (klass); | |
265 | } | |
266 | ||
267 | vfy_jclass | |
268 | vfy_get_superclass (vfy_jclass klass) | |
269 | { | |
270 | vfy_jclass k; | |
271 | k = CLASSTYPE_SUPER (klass); | |
272 | return k; | |
273 | } | |
274 | ||
275 | vfy_jclass | |
276 | vfy_get_array_class (vfy_jclass klass) | |
277 | { | |
278 | vfy_jclass k; | |
279 | k = build_java_array_type (klass, -1); | |
280 | return k; | |
281 | } | |
282 | ||
283 | vfy_jclass | |
284 | vfy_get_component_type (vfy_jclass klass) | |
285 | { | |
286 | vfy_jclass k; | |
ab184b2a | 287 | gcc_assert (vfy_is_array (klass)); |
36739040 TT |
288 | k = TYPE_ARRAY_ELEMENT (klass); |
289 | if (TREE_CODE (k) == POINTER_TYPE) | |
290 | k = TREE_TYPE (k); | |
291 | return k; | |
292 | } | |
293 | ||
294 | bool | |
295 | vfy_is_abstract (vfy_jclass klass) | |
296 | { | |
297 | return CLASS_ABSTRACT (TYPE_NAME (klass)); | |
298 | } | |
299 | ||
300 | vfy_jclass | |
301 | vfy_find_class (vfy_jclass ignore ATTRIBUTE_UNUSED, vfy_string name) | |
302 | { | |
303 | vfy_jclass k; | |
304 | ||
305 | k = get_type_from_signature (name); | |
306 | if (TREE_CODE (k) == POINTER_TYPE) | |
307 | k = TREE_TYPE (k); | |
308 | ||
309 | return k; | |
310 | } | |
311 | ||
312 | vfy_jclass | |
eb9744a7 | 313 | vfy_object_type (void) |
36739040 TT |
314 | { |
315 | vfy_jclass k; | |
316 | k = object_type_node; | |
317 | return k; | |
318 | } | |
319 | ||
153d08d5 TT |
320 | vfy_jclass |
321 | vfy_class_type (void) | |
322 | { | |
323 | return class_type_node; | |
324 | } | |
325 | ||
36739040 | 326 | vfy_jclass |
eb9744a7 | 327 | vfy_string_type (void) |
36739040 TT |
328 | { |
329 | vfy_jclass k; | |
330 | k = string_type_node; | |
331 | return k; | |
332 | } | |
333 | ||
334 | vfy_jclass | |
eb9744a7 | 335 | vfy_throwable_type (void) |
36739040 TT |
336 | { |
337 | vfy_jclass k; | |
338 | k = throwable_type_node; | |
339 | return k; | |
340 | } | |
341 | ||
342 | vfy_jclass | |
343 | vfy_unsuitable_type (void) | |
344 | { | |
345 | return TYPE_SECOND; | |
346 | } | |
347 | ||
348 | vfy_jclass | |
349 | vfy_return_address_type (void) | |
350 | { | |
351 | return TYPE_RETURN_ADDR; | |
352 | } | |
353 | ||
354 | vfy_jclass | |
355 | vfy_null_type (void) | |
356 | { | |
357 | return TYPE_NULL; | |
358 | } | |
359 | ||
1870a43b TT |
360 | bool |
361 | vfy_class_has_field (vfy_jclass klass, vfy_string name, | |
362 | vfy_string signature) | |
363 | { | |
364 | tree field = TYPE_FIELDS (klass); | |
365 | while (field != NULL_TREE) | |
366 | { | |
367 | if (DECL_NAME (field) == name | |
368 | && build_java_signature (TREE_TYPE (field)) == signature) | |
369 | return true; | |
910ad8de | 370 | field = DECL_CHAIN (field); |
1870a43b TT |
371 | } |
372 | return false; | |
373 | } | |
374 | ||
36739040 TT |
375 | int |
376 | vfy_fail (const char *message, int pc, vfy_jclass ignore1 ATTRIBUTE_UNUSED, | |
377 | vfy_method *ignore2 ATTRIBUTE_UNUSED) | |
378 | { | |
379 | if (pc == -1) | |
380 | error ("verification failed: %s", message); | |
381 | else | |
382 | error ("verification failed at PC=%d: %s", pc, message); | |
383 | /* We have to return a value for the verifier to throw. */ | |
384 | return 1; | |
385 | } | |
386 | ||
387 | vfy_jclass | |
388 | vfy_get_primitive_type (int type) | |
389 | { | |
390 | vfy_jclass k; | |
391 | k = decode_newarray_type (type); | |
392 | return k; | |
393 | } | |
394 | ||
395 | void | |
396 | vfy_note_stack_depth (vfy_method *method, int pc, int depth) | |
397 | { | |
3d4e2766 | 398 | tree val = make_tree_vec (method->max_locals + depth); |
9771b263 | 399 | (*type_states)[pc] = val; |
3d4e2766 TT |
400 | /* Called for side effects. */ |
401 | lookup_label (pc); | |
36739040 TT |
402 | } |
403 | ||
404 | void | |
405 | vfy_note_stack_type (vfy_method *method, int pc, int slot, vfy_jclass type) | |
406 | { | |
3d4e2766 | 407 | tree vec; |
36739040 TT |
408 | |
409 | slot += method->max_locals; | |
410 | ||
411 | if (type == object_type_node) | |
412 | type = object_ptr_type_node; | |
413 | ||
9771b263 | 414 | vec = (*type_states)[pc]; |
36739040 | 415 | TREE_VEC_ELT (vec, slot) = type; |
3d4e2766 TT |
416 | /* Called for side effects. */ |
417 | lookup_label (pc); | |
36739040 TT |
418 | } |
419 | ||
420 | void | |
421 | vfy_note_local_type (vfy_method *method ATTRIBUTE_UNUSED, int pc, int slot, | |
422 | vfy_jclass type) | |
423 | { | |
3d4e2766 | 424 | tree vec; |
36739040 TT |
425 | |
426 | if (type == object_type_node) | |
427 | type = object_ptr_type_node; | |
428 | ||
9771b263 | 429 | vec = (*type_states)[pc]; |
36739040 | 430 | TREE_VEC_ELT (vec, slot) = type; |
3d4e2766 TT |
431 | /* Called for side effects. */ |
432 | lookup_label (pc); | |
36739040 TT |
433 | } |
434 | ||
435 | void | |
436 | vfy_note_instruction_seen (int pc) | |
437 | { | |
438 | instruction_bits[pc] |= BCODE_VERIFIED; | |
439 | } | |
440 | ||
441 | /* Verify the bytecodes of the current method. | |
442 | Return 1 on success, 0 on failure. */ | |
443 | int | |
444 | verify_jvm_instructions_new (JCF *jcf, const unsigned char *byte_ops, | |
445 | long length) | |
446 | { | |
447 | vfy_method method; | |
448 | int i, result, eh_count; | |
449 | vfy_exception *exceptions; | |
450 | ||
451 | method_init_exceptions (); | |
452 | ||
453 | JCF_SEEK (jcf, DECL_CODE_OFFSET (current_function_decl) + length); | |
454 | eh_count = JCF_readu2 (jcf); | |
455 | ||
456 | exceptions = (vfy_exception *) xmalloc (eh_count * sizeof (vfy_exception)); | |
457 | for (i = 0; i < eh_count; ++i) | |
458 | { | |
459 | int start_pc, end_pc, handler_pc, catch_type; | |
460 | unsigned char *p = jcf->read_ptr + 8 * i; | |
461 | start_pc = GET_u2 (p); | |
462 | end_pc = GET_u2 (p+2); | |
463 | handler_pc = GET_u2 (p+4); | |
464 | catch_type = GET_u2 (p+6); | |
465 | ||
466 | if (start_pc < 0 || start_pc >= length | |
467 | || end_pc < 0 || end_pc > length || start_pc >= end_pc | |
468 | || handler_pc < 0 || handler_pc >= length) | |
469 | { | |
470 | error ("bad pc in exception_table"); | |
471 | free (exceptions); | |
472 | return 0; | |
473 | } | |
474 | ||
475 | exceptions[i].handler = handler_pc; | |
476 | exceptions[i].start = start_pc; | |
477 | exceptions[i].end = end_pc; | |
478 | exceptions[i].type = catch_type; | |
479 | ||
480 | add_handler (start_pc, end_pc, | |
481 | lookup_label (handler_pc), | |
482 | catch_type == 0 ? NULL_TREE | |
483 | : get_class_constant (jcf, catch_type)); | |
484 | instruction_bits[handler_pc] |= BCODE_EXCEPTION_TARGET; | |
485 | } | |
486 | ||
d393cb72 | 487 | gcc_assert (sanity_check_exception_range (&whole_range)); |
36739040 TT |
488 | |
489 | method.method = current_function_decl; | |
490 | method.signature = build_java_signature (TREE_TYPE (current_function_decl)); | |
491 | method.name = DECL_NAME (current_function_decl); | |
492 | method.bytes = byte_ops; | |
493 | method.exceptions = exceptions; | |
494 | method.defining_class = DECL_CONTEXT (current_function_decl); | |
495 | method.max_stack = DECL_MAX_STACK (current_function_decl); | |
496 | method.max_locals = DECL_MAX_LOCALS (current_function_decl); | |
497 | method.code_length = length; | |
498 | method.exc_count = eh_count; | |
499 | ||
500 | result = verify_method (&method); | |
501 | ||
502 | free (exceptions); | |
503 | ||
504 | return result; | |
505 | } |