Mercurial > hg > graal-jvmci-8
annotate src/share/vm/classfile/stackMapTable.cpp @ 23822:626f594dffa6
8139040: Fix initializations before ShouldNotReachHere() etc. and enable -Wuninitialized on linux.
Reviewed-by: stuefe, coleenp, roland
author | csahu |
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date | Tue, 01 Mar 2016 12:50:37 +0530 |
parents | e36fd279a207 |
children | 02a3d0dcbedd |
rev | line source |
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0 | 1 /* |
17573 | 2 * Copyright (c) 2003, 2014, 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 |
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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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/stackMapTable.hpp" | |
27 #include "classfile/verifier.hpp" | |
28 #include "memory/resourceArea.hpp" | |
29 #include "oops/oop.inline.hpp" | |
30 #include "runtime/fieldType.hpp" | |
31 #include "runtime/handles.inline.hpp" | |
0 | 32 |
33 StackMapTable::StackMapTable(StackMapReader* reader, StackMapFrame* init_frame, | |
34 u2 max_locals, u2 max_stack, | |
35 char* code_data, int code_len, TRAPS) { | |
36 _code_length = code_len; | |
37 _frame_count = reader->get_frame_count(); | |
38 if (_frame_count > 0) { | |
39 _frame_array = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, | |
40 StackMapFrame*, _frame_count); | |
41 StackMapFrame* pre_frame = init_frame; | |
42 for (int32_t i = 0; i < _frame_count; i++) { | |
43 StackMapFrame* frame = reader->next( | |
44 pre_frame, i == 0, max_locals, max_stack, | |
45 CHECK_VERIFY(pre_frame->verifier())); | |
46 _frame_array[i] = frame; | |
47 int offset = frame->offset(); | |
48 if (offset >= code_len || code_data[offset] == 0) { | |
6605 | 49 frame->verifier()->verify_error( |
50 ErrorContext::bad_stackmap(i, frame), | |
51 "StackMapTable error: bad offset"); | |
0 | 52 return; |
53 } | |
54 pre_frame = frame; | |
55 } | |
56 } | |
57 reader->check_end(CHECK); | |
58 } | |
59 | |
60 // This method is only called by method in StackMapTable. | |
61 int StackMapTable::get_index_from_offset(int32_t offset) const { | |
62 int i = 0; | |
63 for (; i < _frame_count; i++) { | |
64 if (_frame_array[i]->offset() == offset) { | |
65 return i; | |
66 } | |
67 } | |
68 return i; // frame with offset doesn't exist in the array | |
69 } | |
70 | |
71 bool StackMapTable::match_stackmap( | |
72 StackMapFrame* frame, int32_t target, | |
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73 bool match, bool update, bool handler, ErrorContext* ctx, TRAPS) const { |
0 | 74 int index = get_index_from_offset(target); |
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75 return match_stackmap(frame, target, index, match, update, handler, ctx, THREAD); |
0 | 76 } |
77 | |
78 // Match and/or update current_frame to the frame in stackmap table with | |
79 // specified offset and frame index. Return true if the two frames match. | |
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80 // handler is true if the frame in stackmap_table is for an exception handler. |
0 | 81 // |
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82 // The values of match and update are: _match__update__handler |
0 | 83 // |
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84 // checking a branch target: true false false |
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85 // checking an exception handler: true false true |
0 | 86 // linear bytecode verification following an |
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87 // unconditional branch: false true false |
0 | 88 // linear bytecode verification not following an |
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89 // unconditional branch: true true false |
0 | 90 bool StackMapTable::match_stackmap( |
91 StackMapFrame* frame, int32_t target, int32_t frame_index, | |
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92 bool match, bool update, bool handler, ErrorContext* ctx, TRAPS) const { |
0 | 93 if (frame_index < 0 || frame_index >= _frame_count) { |
6605 | 94 *ctx = ErrorContext::missing_stackmap(frame->offset()); |
95 frame->verifier()->verify_error( | |
96 *ctx, "Expecting a stackmap frame at branch target %d", target); | |
0 | 97 return false; |
98 } | |
99 | |
6605 | 100 StackMapFrame *stackmap_frame = _frame_array[frame_index]; |
0 | 101 bool result = true; |
102 if (match) { | |
103 // Has direct control flow from last instruction, need to match the two | |
104 // frames. | |
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105 result = frame->is_assignable_to(stackmap_frame, handler, |
6605 | 106 ctx, CHECK_VERIFY_(frame->verifier(), result)); |
0 | 107 } |
108 if (update) { | |
109 // Use the frame in stackmap table as current frame | |
110 int lsize = stackmap_frame->locals_size(); | |
111 int ssize = stackmap_frame->stack_size(); | |
112 if (frame->locals_size() > lsize || frame->stack_size() > ssize) { | |
113 // Make sure unused type array items are all _bogus_type. | |
114 frame->reset(); | |
115 } | |
116 frame->set_locals_size(lsize); | |
117 frame->copy_locals(stackmap_frame); | |
118 frame->set_stack_size(ssize); | |
119 frame->copy_stack(stackmap_frame); | |
120 frame->set_flags(stackmap_frame->flags()); | |
121 } | |
122 return result; | |
123 } | |
124 | |
125 void StackMapTable::check_jump_target( | |
126 StackMapFrame* frame, int32_t target, TRAPS) const { | |
6605 | 127 ErrorContext ctx; |
0 | 128 bool match = match_stackmap( |
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129 frame, target, true, false, false, &ctx, CHECK_VERIFY(frame->verifier())); |
0 | 130 if (!match || (target < 0 || target >= _code_length)) { |
6605 | 131 frame->verifier()->verify_error(ctx, |
132 "Inconsistent stackmap frames at branch target %d", target); | |
0 | 133 } |
134 } | |
135 | |
6605 | 136 void StackMapTable::print_on(outputStream* str) const { |
137 str->indent().print_cr("StackMapTable: frame_count = %d", _frame_count); | |
138 str->indent().print_cr("table = { "); | |
139 { | |
140 streamIndentor si(str); | |
141 for (int32_t i = 0; i < _frame_count; ++i) { | |
142 _frame_array[i]->print_on(str); | |
143 } | |
0 | 144 } |
6605 | 145 str->print_cr(" }"); |
0 | 146 } |
147 | |
148 int32_t StackMapReader::chop( | |
149 VerificationType* locals, int32_t length, int32_t chops) { | |
1769 | 150 if (locals == NULL) return -1; |
0 | 151 int32_t pos = length - 1; |
152 for (int32_t i=0; i<chops; i++) { | |
153 if (locals[pos].is_category2_2nd()) { | |
154 pos -= 2; | |
155 } else { | |
156 pos --; | |
157 } | |
158 if (pos<0 && i<(chops-1)) return -1; | |
159 } | |
160 return pos+1; | |
161 } | |
162 | |
163 VerificationType StackMapReader::parse_verification_type(u1* flags, TRAPS) { | |
164 u1 tag = _stream->get_u1(THREAD); | |
165 if (tag < (u1)ITEM_UninitializedThis) { | |
166 return VerificationType::from_tag(tag); | |
167 } | |
168 if (tag == ITEM_Object) { | |
169 u2 class_index = _stream->get_u2(THREAD); | |
170 int nconstants = _cp->length(); | |
171 if ((class_index <= 0 || class_index >= nconstants) || | |
172 (!_cp->tag_at(class_index).is_klass() && | |
173 !_cp->tag_at(class_index).is_unresolved_klass())) { | |
174 _stream->stackmap_format_error("bad class index", THREAD); | |
175 return VerificationType::bogus_type(); | |
176 } | |
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177 return VerificationType::reference_type(_cp->klass_name_at(class_index)); |
0 | 178 } |
179 if (tag == ITEM_UninitializedThis) { | |
180 if (flags != NULL) { | |
181 *flags |= FLAG_THIS_UNINIT; | |
182 } | |
183 return VerificationType::uninitialized_this_type(); | |
184 } | |
185 if (tag == ITEM_Uninitialized) { | |
186 u2 offset = _stream->get_u2(THREAD); | |
187 if (offset >= _code_length || | |
188 _code_data[offset] != ClassVerifier::NEW_OFFSET) { | |
189 _verifier->class_format_error( | |
190 "StackMapTable format error: bad offset for Uninitialized"); | |
191 return VerificationType::bogus_type(); | |
192 } | |
193 return VerificationType::uninitialized_type(offset); | |
194 } | |
195 _stream->stackmap_format_error("bad verification type", THREAD); | |
196 return VerificationType::bogus_type(); | |
197 } | |
198 | |
199 StackMapFrame* StackMapReader::next( | |
200 StackMapFrame* pre_frame, bool first, u2 max_locals, u2 max_stack, TRAPS) { | |
201 StackMapFrame* frame; | |
202 int offset; | |
203 VerificationType* locals = NULL; | |
204 u1 frame_type = _stream->get_u1(THREAD); | |
205 if (frame_type < 64) { | |
206 // same_frame | |
207 if (first) { | |
208 offset = frame_type; | |
209 // Can't share the locals array since that is updated by the verifier. | |
210 if (pre_frame->locals_size() > 0) { | |
211 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
212 THREAD, VerificationType, pre_frame->locals_size()); | |
213 } | |
214 } else { | |
215 offset = pre_frame->offset() + frame_type + 1; | |
216 locals = pre_frame->locals(); | |
217 } | |
218 frame = new StackMapFrame( | |
219 offset, pre_frame->flags(), pre_frame->locals_size(), 0, | |
220 max_locals, max_stack, locals, NULL, _verifier); | |
221 if (first && locals != NULL) { | |
222 frame->copy_locals(pre_frame); | |
223 } | |
224 return frame; | |
225 } | |
226 if (frame_type < 128) { | |
227 // same_locals_1_stack_item_frame | |
228 if (first) { | |
229 offset = frame_type - 64; | |
230 // Can't share the locals array since that is updated by the verifier. | |
231 if (pre_frame->locals_size() > 0) { | |
232 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
233 THREAD, VerificationType, pre_frame->locals_size()); | |
234 } | |
235 } else { | |
236 offset = pre_frame->offset() + frame_type - 63; | |
237 locals = pre_frame->locals(); | |
238 } | |
239 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
240 THREAD, VerificationType, 2); | |
241 u2 stack_size = 1; | |
242 stack[0] = parse_verification_type(NULL, CHECK_VERIFY_(_verifier, NULL)); | |
243 if (stack[0].is_category2()) { | |
244 stack[1] = stack[0].to_category2_2nd(); | |
245 stack_size = 2; | |
246 } | |
247 check_verification_type_array_size( | |
248 stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
249 frame = new StackMapFrame( | |
250 offset, pre_frame->flags(), pre_frame->locals_size(), stack_size, | |
251 max_locals, max_stack, locals, stack, _verifier); | |
252 if (first && locals != NULL) { | |
253 frame->copy_locals(pre_frame); | |
254 } | |
255 return frame; | |
256 } | |
257 | |
258 u2 offset_delta = _stream->get_u2(THREAD); | |
259 | |
260 if (frame_type < SAME_LOCALS_1_STACK_ITEM_EXTENDED) { | |
261 // reserved frame types | |
262 _stream->stackmap_format_error( | |
263 "reserved frame type", CHECK_VERIFY_(_verifier, NULL)); | |
264 } | |
265 | |
266 if (frame_type == SAME_LOCALS_1_STACK_ITEM_EXTENDED) { | |
267 // same_locals_1_stack_item_frame_extended | |
268 if (first) { | |
269 offset = offset_delta; | |
270 // Can't share the locals array since that is updated by the verifier. | |
271 if (pre_frame->locals_size() > 0) { | |
272 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
273 THREAD, VerificationType, pre_frame->locals_size()); | |
274 } | |
275 } else { | |
276 offset = pre_frame->offset() + offset_delta + 1; | |
277 locals = pre_frame->locals(); | |
278 } | |
279 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
280 THREAD, VerificationType, 2); | |
281 u2 stack_size = 1; | |
282 stack[0] = parse_verification_type(NULL, CHECK_VERIFY_(_verifier, NULL)); | |
283 if (stack[0].is_category2()) { | |
284 stack[1] = stack[0].to_category2_2nd(); | |
285 stack_size = 2; | |
286 } | |
287 check_verification_type_array_size( | |
288 stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
289 frame = new StackMapFrame( | |
290 offset, pre_frame->flags(), pre_frame->locals_size(), stack_size, | |
291 max_locals, max_stack, locals, stack, _verifier); | |
292 if (first && locals != NULL) { | |
293 frame->copy_locals(pre_frame); | |
294 } | |
295 return frame; | |
296 } | |
297 | |
298 if (frame_type <= SAME_EXTENDED) { | |
299 // chop_frame or same_frame_extended | |
300 locals = pre_frame->locals(); | |
301 int length = pre_frame->locals_size(); | |
302 int chops = SAME_EXTENDED - frame_type; | |
303 int new_length = length; | |
304 u1 flags = pre_frame->flags(); | |
305 if (chops != 0) { | |
306 new_length = chop(locals, length, chops); | |
307 check_verification_type_array_size( | |
308 new_length, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
309 // Recompute flags since uninitializedThis could have been chopped. | |
310 flags = 0; | |
311 for (int i=0; i<new_length; i++) { | |
312 if (locals[i].is_uninitialized_this()) { | |
313 flags |= FLAG_THIS_UNINIT; | |
314 break; | |
315 } | |
316 } | |
317 } | |
318 if (first) { | |
319 offset = offset_delta; | |
320 // Can't share the locals array since that is updated by the verifier. | |
321 if (new_length > 0) { | |
322 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
323 THREAD, VerificationType, new_length); | |
324 } else { | |
325 locals = NULL; | |
326 } | |
327 } else { | |
328 offset = pre_frame->offset() + offset_delta + 1; | |
329 } | |
330 frame = new StackMapFrame( | |
331 offset, flags, new_length, 0, max_locals, max_stack, | |
332 locals, NULL, _verifier); | |
333 if (first && locals != NULL) { | |
334 frame->copy_locals(pre_frame); | |
335 } | |
336 return frame; | |
337 } else if (frame_type < SAME_EXTENDED + 4) { | |
338 // append_frame | |
339 int appends = frame_type - SAME_EXTENDED; | |
340 int real_length = pre_frame->locals_size(); | |
341 int new_length = real_length + appends*2; | |
342 locals = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, new_length); | |
343 VerificationType* pre_locals = pre_frame->locals(); | |
344 int i; | |
345 for (i=0; i<pre_frame->locals_size(); i++) { | |
346 locals[i] = pre_locals[i]; | |
347 } | |
348 u1 flags = pre_frame->flags(); | |
349 for (i=0; i<appends; i++) { | |
350 locals[real_length] = parse_verification_type(&flags, THREAD); | |
351 if (locals[real_length].is_category2()) { | |
352 locals[real_length + 1] = locals[real_length].to_category2_2nd(); | |
353 ++real_length; | |
354 } | |
355 ++real_length; | |
356 } | |
357 check_verification_type_array_size( | |
358 real_length, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
359 if (first) { | |
360 offset = offset_delta; | |
361 } else { | |
362 offset = pre_frame->offset() + offset_delta + 1; | |
363 } | |
364 frame = new StackMapFrame( | |
365 offset, flags, real_length, 0, max_locals, | |
366 max_stack, locals, NULL, _verifier); | |
367 return frame; | |
368 } | |
369 if (frame_type == FULL) { | |
370 // full_frame | |
371 u1 flags = 0; | |
372 u2 locals_size = _stream->get_u2(THREAD); | |
373 int real_locals_size = 0; | |
374 if (locals_size > 0) { | |
375 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
376 THREAD, VerificationType, locals_size*2); | |
377 } | |
378 int i; | |
379 for (i=0; i<locals_size; i++) { | |
380 locals[real_locals_size] = parse_verification_type(&flags, THREAD); | |
381 if (locals[real_locals_size].is_category2()) { | |
382 locals[real_locals_size + 1] = | |
383 locals[real_locals_size].to_category2_2nd(); | |
384 ++real_locals_size; | |
385 } | |
386 ++real_locals_size; | |
387 } | |
388 check_verification_type_array_size( | |
389 real_locals_size, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
390 u2 stack_size = _stream->get_u2(THREAD); | |
391 int real_stack_size = 0; | |
392 VerificationType* stack = NULL; | |
393 if (stack_size > 0) { | |
394 stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
395 THREAD, VerificationType, stack_size*2); | |
396 } | |
397 for (i=0; i<stack_size; i++) { | |
398 stack[real_stack_size] = parse_verification_type(NULL, THREAD); | |
399 if (stack[real_stack_size].is_category2()) { | |
400 stack[real_stack_size + 1] = stack[real_stack_size].to_category2_2nd(); | |
401 ++real_stack_size; | |
402 } | |
403 ++real_stack_size; | |
404 } | |
405 check_verification_type_array_size( | |
406 real_stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
407 if (first) { | |
408 offset = offset_delta; | |
409 } else { | |
410 offset = pre_frame->offset() + offset_delta + 1; | |
411 } | |
412 frame = new StackMapFrame( | |
413 offset, flags, real_locals_size, real_stack_size, | |
414 max_locals, max_stack, locals, stack, _verifier); | |
415 return frame; | |
416 } | |
417 | |
418 _stream->stackmap_format_error( | |
419 "reserved frame type", CHECK_VERIFY_(pre_frame->verifier(), NULL)); | |
420 return NULL; | |
421 } |