Mercurial > hg > truffle
annotate src/share/vm/classfile/stackMapTable.cpp @ 1689:f4f596978298
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author | never |
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date | Mon, 09 Aug 2010 17:51:56 -0700 |
parents | c18cbe5936b8 |
children | 1ab9e2cbfa0e |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_stackMapTable.cpp.incl" | |
27 | |
28 StackMapTable::StackMapTable(StackMapReader* reader, StackMapFrame* init_frame, | |
29 u2 max_locals, u2 max_stack, | |
30 char* code_data, int code_len, TRAPS) { | |
31 _code_length = code_len; | |
32 _frame_count = reader->get_frame_count(); | |
33 if (_frame_count > 0) { | |
34 _frame_array = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, | |
35 StackMapFrame*, _frame_count); | |
36 StackMapFrame* pre_frame = init_frame; | |
37 for (int32_t i = 0; i < _frame_count; i++) { | |
38 StackMapFrame* frame = reader->next( | |
39 pre_frame, i == 0, max_locals, max_stack, | |
40 CHECK_VERIFY(pre_frame->verifier())); | |
41 _frame_array[i] = frame; | |
42 int offset = frame->offset(); | |
43 if (offset >= code_len || code_data[offset] == 0) { | |
44 frame->verifier()->verify_error("StackMapTable error: bad offset"); | |
45 return; | |
46 } | |
47 pre_frame = frame; | |
48 } | |
49 } | |
50 reader->check_end(CHECK); | |
51 } | |
52 | |
53 // This method is only called by method in StackMapTable. | |
54 int StackMapTable::get_index_from_offset(int32_t offset) const { | |
55 int i = 0; | |
56 for (; i < _frame_count; i++) { | |
57 if (_frame_array[i]->offset() == offset) { | |
58 return i; | |
59 } | |
60 } | |
61 return i; // frame with offset doesn't exist in the array | |
62 } | |
63 | |
64 bool StackMapTable::match_stackmap( | |
65 StackMapFrame* frame, int32_t target, | |
66 bool match, bool update, TRAPS) const { | |
67 int index = get_index_from_offset(target); | |
68 | |
69 return match_stackmap( | |
70 frame, target, index, match, | |
71 update, CHECK_VERIFY_(frame->verifier(), false)); | |
72 } | |
73 | |
74 // Match and/or update current_frame to the frame in stackmap table with | |
75 // specified offset and frame index. Return true if the two frames match. | |
76 // | |
77 // The values of match and update are: _match__update_ | |
78 // | |
79 // checking a branch target/exception handler: true false | |
80 // linear bytecode verification following an | |
81 // unconditional branch: false true | |
82 // linear bytecode verification not following an | |
83 // unconditional branch: true true | |
84 bool StackMapTable::match_stackmap( | |
85 StackMapFrame* frame, int32_t target, int32_t frame_index, | |
86 bool match, bool update, TRAPS) const { | |
87 if (frame_index < 0 || frame_index >= _frame_count) { | |
88 frame->verifier()->verify_error(frame->offset(), | |
89 "Expecting a stackmap frame at branch target %d", target); | |
90 return false; | |
91 } | |
92 | |
93 bool result = true; | |
94 StackMapFrame *stackmap_frame = _frame_array[frame_index]; | |
95 if (match) { | |
96 // Has direct control flow from last instruction, need to match the two | |
97 // frames. | |
98 result = frame->is_assignable_to( | |
99 stackmap_frame, CHECK_VERIFY_(frame->verifier(), false)); | |
100 } | |
101 if (update) { | |
102 // Use the frame in stackmap table as current frame | |
103 int lsize = stackmap_frame->locals_size(); | |
104 int ssize = stackmap_frame->stack_size(); | |
105 if (frame->locals_size() > lsize || frame->stack_size() > ssize) { | |
106 // Make sure unused type array items are all _bogus_type. | |
107 frame->reset(); | |
108 } | |
109 frame->set_locals_size(lsize); | |
110 frame->copy_locals(stackmap_frame); | |
111 frame->set_stack_size(ssize); | |
112 frame->copy_stack(stackmap_frame); | |
113 frame->set_flags(stackmap_frame->flags()); | |
114 } | |
115 return result; | |
116 } | |
117 | |
118 void StackMapTable::check_jump_target( | |
119 StackMapFrame* frame, int32_t target, TRAPS) const { | |
120 bool match = match_stackmap( | |
121 frame, target, true, false, CHECK_VERIFY(frame->verifier())); | |
122 if (!match || (target < 0 || target >= _code_length)) { | |
123 frame->verifier()->verify_error(frame->offset(), | |
124 "Inconsistent stackmap frames at branch target %d", target); | |
125 return; | |
126 } | |
127 // check if uninitialized objects exist on backward branches | |
128 check_new_object(frame, target, CHECK_VERIFY(frame->verifier())); | |
129 } | |
130 | |
131 void StackMapTable::check_new_object( | |
132 const StackMapFrame* frame, int32_t target, TRAPS) const { | |
133 if (frame->offset() > target && frame->has_new_object()) { | |
134 frame->verifier()->verify_error(frame->offset(), | |
135 "Uninitialized object exists on backward branch %d", target); | |
136 return; | |
137 } | |
138 } | |
139 | |
140 #ifndef PRODUCT | |
141 | |
142 void StackMapTable::print() const { | |
143 tty->print_cr("StackMapTable: frame_count = %d", _frame_count); | |
144 tty->print_cr("table = { "); | |
145 for (int32_t i = 0; i < _frame_count; i++) { | |
146 _frame_array[i]->print(); | |
147 } | |
148 tty->print_cr(" }"); | |
149 } | |
150 | |
151 #endif | |
152 | |
153 int32_t StackMapReader::chop( | |
154 VerificationType* locals, int32_t length, int32_t chops) { | |
155 int32_t pos = length - 1; | |
156 for (int32_t i=0; i<chops; i++) { | |
157 if (locals[pos].is_category2_2nd()) { | |
158 pos -= 2; | |
159 } else { | |
160 pos --; | |
161 } | |
162 if (pos<0 && i<(chops-1)) return -1; | |
163 } | |
164 return pos+1; | |
165 } | |
166 | |
167 VerificationType StackMapReader::parse_verification_type(u1* flags, TRAPS) { | |
168 u1 tag = _stream->get_u1(THREAD); | |
169 if (tag < (u1)ITEM_UninitializedThis) { | |
170 return VerificationType::from_tag(tag); | |
171 } | |
172 if (tag == ITEM_Object) { | |
173 u2 class_index = _stream->get_u2(THREAD); | |
174 int nconstants = _cp->length(); | |
175 if ((class_index <= 0 || class_index >= nconstants) || | |
176 (!_cp->tag_at(class_index).is_klass() && | |
177 !_cp->tag_at(class_index).is_unresolved_klass())) { | |
178 _stream->stackmap_format_error("bad class index", THREAD); | |
179 return VerificationType::bogus_type(); | |
180 } | |
181 return VerificationType::reference_type( | |
182 symbolHandle(THREAD, _cp->klass_name_at(class_index))); | |
183 } | |
184 if (tag == ITEM_UninitializedThis) { | |
185 if (flags != NULL) { | |
186 *flags |= FLAG_THIS_UNINIT; | |
187 } | |
188 return VerificationType::uninitialized_this_type(); | |
189 } | |
190 if (tag == ITEM_Uninitialized) { | |
191 u2 offset = _stream->get_u2(THREAD); | |
192 if (offset >= _code_length || | |
193 _code_data[offset] != ClassVerifier::NEW_OFFSET) { | |
194 ResourceMark rm(THREAD); | |
195 _verifier->class_format_error( | |
196 "StackMapTable format error: bad offset for Uninitialized"); | |
197 return VerificationType::bogus_type(); | |
198 } | |
199 return VerificationType::uninitialized_type(offset); | |
200 } | |
201 _stream->stackmap_format_error("bad verification type", THREAD); | |
202 return VerificationType::bogus_type(); | |
203 } | |
204 | |
205 StackMapFrame* StackMapReader::next( | |
206 StackMapFrame* pre_frame, bool first, u2 max_locals, u2 max_stack, TRAPS) { | |
207 StackMapFrame* frame; | |
208 int offset; | |
209 VerificationType* locals = NULL; | |
210 u1 frame_type = _stream->get_u1(THREAD); | |
211 if (frame_type < 64) { | |
212 // same_frame | |
213 if (first) { | |
214 offset = frame_type; | |
215 // Can't share the locals array since that is updated by the verifier. | |
216 if (pre_frame->locals_size() > 0) { | |
217 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
218 THREAD, VerificationType, pre_frame->locals_size()); | |
219 } | |
220 } else { | |
221 offset = pre_frame->offset() + frame_type + 1; | |
222 locals = pre_frame->locals(); | |
223 } | |
224 frame = new StackMapFrame( | |
225 offset, pre_frame->flags(), pre_frame->locals_size(), 0, | |
226 max_locals, max_stack, locals, NULL, _verifier); | |
227 if (first && locals != NULL) { | |
228 frame->copy_locals(pre_frame); | |
229 } | |
230 return frame; | |
231 } | |
232 if (frame_type < 128) { | |
233 // same_locals_1_stack_item_frame | |
234 if (first) { | |
235 offset = frame_type - 64; | |
236 // Can't share the locals array since that is updated by the verifier. | |
237 if (pre_frame->locals_size() > 0) { | |
238 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
239 THREAD, VerificationType, pre_frame->locals_size()); | |
240 } | |
241 } else { | |
242 offset = pre_frame->offset() + frame_type - 63; | |
243 locals = pre_frame->locals(); | |
244 } | |
245 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
246 THREAD, VerificationType, 2); | |
247 u2 stack_size = 1; | |
248 stack[0] = parse_verification_type(NULL, CHECK_VERIFY_(_verifier, NULL)); | |
249 if (stack[0].is_category2()) { | |
250 stack[1] = stack[0].to_category2_2nd(); | |
251 stack_size = 2; | |
252 } | |
253 check_verification_type_array_size( | |
254 stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
255 frame = new StackMapFrame( | |
256 offset, pre_frame->flags(), pre_frame->locals_size(), stack_size, | |
257 max_locals, max_stack, locals, stack, _verifier); | |
258 if (first && locals != NULL) { | |
259 frame->copy_locals(pre_frame); | |
260 } | |
261 return frame; | |
262 } | |
263 | |
264 u2 offset_delta = _stream->get_u2(THREAD); | |
265 | |
266 if (frame_type < SAME_LOCALS_1_STACK_ITEM_EXTENDED) { | |
267 // reserved frame types | |
268 _stream->stackmap_format_error( | |
269 "reserved frame type", CHECK_VERIFY_(_verifier, NULL)); | |
270 } | |
271 | |
272 if (frame_type == SAME_LOCALS_1_STACK_ITEM_EXTENDED) { | |
273 // same_locals_1_stack_item_frame_extended | |
274 if (first) { | |
275 offset = offset_delta; | |
276 // Can't share the locals array since that is updated by the verifier. | |
277 if (pre_frame->locals_size() > 0) { | |
278 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
279 THREAD, VerificationType, pre_frame->locals_size()); | |
280 } | |
281 } else { | |
282 offset = pre_frame->offset() + offset_delta + 1; | |
283 locals = pre_frame->locals(); | |
284 } | |
285 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
286 THREAD, VerificationType, 2); | |
287 u2 stack_size = 1; | |
288 stack[0] = parse_verification_type(NULL, CHECK_VERIFY_(_verifier, NULL)); | |
289 if (stack[0].is_category2()) { | |
290 stack[1] = stack[0].to_category2_2nd(); | |
291 stack_size = 2; | |
292 } | |
293 check_verification_type_array_size( | |
294 stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
295 frame = new StackMapFrame( | |
296 offset, pre_frame->flags(), pre_frame->locals_size(), stack_size, | |
297 max_locals, max_stack, locals, stack, _verifier); | |
298 if (first && locals != NULL) { | |
299 frame->copy_locals(pre_frame); | |
300 } | |
301 return frame; | |
302 } | |
303 | |
304 if (frame_type <= SAME_EXTENDED) { | |
305 // chop_frame or same_frame_extended | |
306 locals = pre_frame->locals(); | |
307 int length = pre_frame->locals_size(); | |
308 int chops = SAME_EXTENDED - frame_type; | |
309 int new_length = length; | |
310 u1 flags = pre_frame->flags(); | |
311 if (chops != 0) { | |
312 new_length = chop(locals, length, chops); | |
313 check_verification_type_array_size( | |
314 new_length, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
315 // Recompute flags since uninitializedThis could have been chopped. | |
316 flags = 0; | |
317 for (int i=0; i<new_length; i++) { | |
318 if (locals[i].is_uninitialized_this()) { | |
319 flags |= FLAG_THIS_UNINIT; | |
320 break; | |
321 } | |
322 } | |
323 } | |
324 if (first) { | |
325 offset = offset_delta; | |
326 // Can't share the locals array since that is updated by the verifier. | |
327 if (new_length > 0) { | |
328 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
329 THREAD, VerificationType, new_length); | |
330 } else { | |
331 locals = NULL; | |
332 } | |
333 } else { | |
334 offset = pre_frame->offset() + offset_delta + 1; | |
335 } | |
336 frame = new StackMapFrame( | |
337 offset, flags, new_length, 0, max_locals, max_stack, | |
338 locals, NULL, _verifier); | |
339 if (first && locals != NULL) { | |
340 frame->copy_locals(pre_frame); | |
341 } | |
342 return frame; | |
343 } else if (frame_type < SAME_EXTENDED + 4) { | |
344 // append_frame | |
345 int appends = frame_type - SAME_EXTENDED; | |
346 int real_length = pre_frame->locals_size(); | |
347 int new_length = real_length + appends*2; | |
348 locals = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, new_length); | |
349 VerificationType* pre_locals = pre_frame->locals(); | |
350 int i; | |
351 for (i=0; i<pre_frame->locals_size(); i++) { | |
352 locals[i] = pre_locals[i]; | |
353 } | |
354 u1 flags = pre_frame->flags(); | |
355 for (i=0; i<appends; i++) { | |
356 locals[real_length] = parse_verification_type(&flags, THREAD); | |
357 if (locals[real_length].is_category2()) { | |
358 locals[real_length + 1] = locals[real_length].to_category2_2nd(); | |
359 ++real_length; | |
360 } | |
361 ++real_length; | |
362 } | |
363 check_verification_type_array_size( | |
364 real_length, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
365 if (first) { | |
366 offset = offset_delta; | |
367 } else { | |
368 offset = pre_frame->offset() + offset_delta + 1; | |
369 } | |
370 frame = new StackMapFrame( | |
371 offset, flags, real_length, 0, max_locals, | |
372 max_stack, locals, NULL, _verifier); | |
373 return frame; | |
374 } | |
375 if (frame_type == FULL) { | |
376 // full_frame | |
377 u1 flags = 0; | |
378 u2 locals_size = _stream->get_u2(THREAD); | |
379 int real_locals_size = 0; | |
380 if (locals_size > 0) { | |
381 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
382 THREAD, VerificationType, locals_size*2); | |
383 } | |
384 int i; | |
385 for (i=0; i<locals_size; i++) { | |
386 locals[real_locals_size] = parse_verification_type(&flags, THREAD); | |
387 if (locals[real_locals_size].is_category2()) { | |
388 locals[real_locals_size + 1] = | |
389 locals[real_locals_size].to_category2_2nd(); | |
390 ++real_locals_size; | |
391 } | |
392 ++real_locals_size; | |
393 } | |
394 check_verification_type_array_size( | |
395 real_locals_size, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
396 u2 stack_size = _stream->get_u2(THREAD); | |
397 int real_stack_size = 0; | |
398 VerificationType* stack = NULL; | |
399 if (stack_size > 0) { | |
400 stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
401 THREAD, VerificationType, stack_size*2); | |
402 } | |
403 for (i=0; i<stack_size; i++) { | |
404 stack[real_stack_size] = parse_verification_type(NULL, THREAD); | |
405 if (stack[real_stack_size].is_category2()) { | |
406 stack[real_stack_size + 1] = stack[real_stack_size].to_category2_2nd(); | |
407 ++real_stack_size; | |
408 } | |
409 ++real_stack_size; | |
410 } | |
411 check_verification_type_array_size( | |
412 real_stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
413 if (first) { | |
414 offset = offset_delta; | |
415 } else { | |
416 offset = pre_frame->offset() + offset_delta + 1; | |
417 } | |
418 frame = new StackMapFrame( | |
419 offset, flags, real_locals_size, real_stack_size, | |
420 max_locals, max_stack, locals, stack, _verifier); | |
421 return frame; | |
422 } | |
423 | |
424 _stream->stackmap_format_error( | |
425 "reserved frame type", CHECK_VERIFY_(pre_frame->verifier(), NULL)); | |
426 return NULL; | |
427 } |