Mercurial > hg > truffle
annotate src/share/vm/classfile/stackMapTable.cpp @ 21244:bf5e055dbc9c
SSAUtils: minor refactoring.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 30 Apr 2015 15:36:03 +0200 |
parents | c77d5db18942 |
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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 ResourceMark rm(THREAD); | |
190 _verifier->class_format_error( | |
191 "StackMapTable format error: bad offset for Uninitialized"); | |
192 return VerificationType::bogus_type(); | |
193 } | |
194 return VerificationType::uninitialized_type(offset); | |
195 } | |
196 _stream->stackmap_format_error("bad verification type", THREAD); | |
197 return VerificationType::bogus_type(); | |
198 } | |
199 | |
200 StackMapFrame* StackMapReader::next( | |
201 StackMapFrame* pre_frame, bool first, u2 max_locals, u2 max_stack, TRAPS) { | |
202 StackMapFrame* frame; | |
203 int offset; | |
204 VerificationType* locals = NULL; | |
205 u1 frame_type = _stream->get_u1(THREAD); | |
206 if (frame_type < 64) { | |
207 // same_frame | |
208 if (first) { | |
209 offset = frame_type; | |
210 // Can't share the locals array since that is updated by the verifier. | |
211 if (pre_frame->locals_size() > 0) { | |
212 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
213 THREAD, VerificationType, pre_frame->locals_size()); | |
214 } | |
215 } else { | |
216 offset = pre_frame->offset() + frame_type + 1; | |
217 locals = pre_frame->locals(); | |
218 } | |
219 frame = new StackMapFrame( | |
220 offset, pre_frame->flags(), pre_frame->locals_size(), 0, | |
221 max_locals, max_stack, locals, NULL, _verifier); | |
222 if (first && locals != NULL) { | |
223 frame->copy_locals(pre_frame); | |
224 } | |
225 return frame; | |
226 } | |
227 if (frame_type < 128) { | |
228 // same_locals_1_stack_item_frame | |
229 if (first) { | |
230 offset = frame_type - 64; | |
231 // Can't share the locals array since that is updated by the verifier. | |
232 if (pre_frame->locals_size() > 0) { | |
233 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
234 THREAD, VerificationType, pre_frame->locals_size()); | |
235 } | |
236 } else { | |
237 offset = pre_frame->offset() + frame_type - 63; | |
238 locals = pre_frame->locals(); | |
239 } | |
240 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
241 THREAD, VerificationType, 2); | |
242 u2 stack_size = 1; | |
243 stack[0] = parse_verification_type(NULL, CHECK_VERIFY_(_verifier, NULL)); | |
244 if (stack[0].is_category2()) { | |
245 stack[1] = stack[0].to_category2_2nd(); | |
246 stack_size = 2; | |
247 } | |
248 check_verification_type_array_size( | |
249 stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
250 frame = new StackMapFrame( | |
251 offset, pre_frame->flags(), pre_frame->locals_size(), stack_size, | |
252 max_locals, max_stack, locals, stack, _verifier); | |
253 if (first && locals != NULL) { | |
254 frame->copy_locals(pre_frame); | |
255 } | |
256 return frame; | |
257 } | |
258 | |
259 u2 offset_delta = _stream->get_u2(THREAD); | |
260 | |
261 if (frame_type < SAME_LOCALS_1_STACK_ITEM_EXTENDED) { | |
262 // reserved frame types | |
263 _stream->stackmap_format_error( | |
264 "reserved frame type", CHECK_VERIFY_(_verifier, NULL)); | |
265 } | |
266 | |
267 if (frame_type == SAME_LOCALS_1_STACK_ITEM_EXTENDED) { | |
268 // same_locals_1_stack_item_frame_extended | |
269 if (first) { | |
270 offset = offset_delta; | |
271 // Can't share the locals array since that is updated by the verifier. | |
272 if (pre_frame->locals_size() > 0) { | |
273 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
274 THREAD, VerificationType, pre_frame->locals_size()); | |
275 } | |
276 } else { | |
277 offset = pre_frame->offset() + offset_delta + 1; | |
278 locals = pre_frame->locals(); | |
279 } | |
280 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
281 THREAD, VerificationType, 2); | |
282 u2 stack_size = 1; | |
283 stack[0] = parse_verification_type(NULL, CHECK_VERIFY_(_verifier, NULL)); | |
284 if (stack[0].is_category2()) { | |
285 stack[1] = stack[0].to_category2_2nd(); | |
286 stack_size = 2; | |
287 } | |
288 check_verification_type_array_size( | |
289 stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
290 frame = new StackMapFrame( | |
291 offset, pre_frame->flags(), pre_frame->locals_size(), stack_size, | |
292 max_locals, max_stack, locals, stack, _verifier); | |
293 if (first && locals != NULL) { | |
294 frame->copy_locals(pre_frame); | |
295 } | |
296 return frame; | |
297 } | |
298 | |
299 if (frame_type <= SAME_EXTENDED) { | |
300 // chop_frame or same_frame_extended | |
301 locals = pre_frame->locals(); | |
302 int length = pre_frame->locals_size(); | |
303 int chops = SAME_EXTENDED - frame_type; | |
304 int new_length = length; | |
305 u1 flags = pre_frame->flags(); | |
306 if (chops != 0) { | |
307 new_length = chop(locals, length, chops); | |
308 check_verification_type_array_size( | |
309 new_length, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
310 // Recompute flags since uninitializedThis could have been chopped. | |
311 flags = 0; | |
312 for (int i=0; i<new_length; i++) { | |
313 if (locals[i].is_uninitialized_this()) { | |
314 flags |= FLAG_THIS_UNINIT; | |
315 break; | |
316 } | |
317 } | |
318 } | |
319 if (first) { | |
320 offset = offset_delta; | |
321 // Can't share the locals array since that is updated by the verifier. | |
322 if (new_length > 0) { | |
323 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
324 THREAD, VerificationType, new_length); | |
325 } else { | |
326 locals = NULL; | |
327 } | |
328 } else { | |
329 offset = pre_frame->offset() + offset_delta + 1; | |
330 } | |
331 frame = new StackMapFrame( | |
332 offset, flags, new_length, 0, max_locals, max_stack, | |
333 locals, NULL, _verifier); | |
334 if (first && locals != NULL) { | |
335 frame->copy_locals(pre_frame); | |
336 } | |
337 return frame; | |
338 } else if (frame_type < SAME_EXTENDED + 4) { | |
339 // append_frame | |
340 int appends = frame_type - SAME_EXTENDED; | |
341 int real_length = pre_frame->locals_size(); | |
342 int new_length = real_length + appends*2; | |
343 locals = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, new_length); | |
344 VerificationType* pre_locals = pre_frame->locals(); | |
345 int i; | |
346 for (i=0; i<pre_frame->locals_size(); i++) { | |
347 locals[i] = pre_locals[i]; | |
348 } | |
349 u1 flags = pre_frame->flags(); | |
350 for (i=0; i<appends; i++) { | |
351 locals[real_length] = parse_verification_type(&flags, THREAD); | |
352 if (locals[real_length].is_category2()) { | |
353 locals[real_length + 1] = locals[real_length].to_category2_2nd(); | |
354 ++real_length; | |
355 } | |
356 ++real_length; | |
357 } | |
358 check_verification_type_array_size( | |
359 real_length, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
360 if (first) { | |
361 offset = offset_delta; | |
362 } else { | |
363 offset = pre_frame->offset() + offset_delta + 1; | |
364 } | |
365 frame = new StackMapFrame( | |
366 offset, flags, real_length, 0, max_locals, | |
367 max_stack, locals, NULL, _verifier); | |
368 return frame; | |
369 } | |
370 if (frame_type == FULL) { | |
371 // full_frame | |
372 u1 flags = 0; | |
373 u2 locals_size = _stream->get_u2(THREAD); | |
374 int real_locals_size = 0; | |
375 if (locals_size > 0) { | |
376 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
377 THREAD, VerificationType, locals_size*2); | |
378 } | |
379 int i; | |
380 for (i=0; i<locals_size; i++) { | |
381 locals[real_locals_size] = parse_verification_type(&flags, THREAD); | |
382 if (locals[real_locals_size].is_category2()) { | |
383 locals[real_locals_size + 1] = | |
384 locals[real_locals_size].to_category2_2nd(); | |
385 ++real_locals_size; | |
386 } | |
387 ++real_locals_size; | |
388 } | |
389 check_verification_type_array_size( | |
390 real_locals_size, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
391 u2 stack_size = _stream->get_u2(THREAD); | |
392 int real_stack_size = 0; | |
393 VerificationType* stack = NULL; | |
394 if (stack_size > 0) { | |
395 stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
396 THREAD, VerificationType, stack_size*2); | |
397 } | |
398 for (i=0; i<stack_size; i++) { | |
399 stack[real_stack_size] = parse_verification_type(NULL, THREAD); | |
400 if (stack[real_stack_size].is_category2()) { | |
401 stack[real_stack_size + 1] = stack[real_stack_size].to_category2_2nd(); | |
402 ++real_stack_size; | |
403 } | |
404 ++real_stack_size; | |
405 } | |
406 check_verification_type_array_size( | |
407 real_stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
408 if (first) { | |
409 offset = offset_delta; | |
410 } else { | |
411 offset = pre_frame->offset() + offset_delta + 1; | |
412 } | |
413 frame = new StackMapFrame( | |
414 offset, flags, real_locals_size, real_stack_size, | |
415 max_locals, max_stack, locals, stack, _verifier); | |
416 return frame; | |
417 } | |
418 | |
419 _stream->stackmap_format_error( | |
420 "reserved frame type", CHECK_VERIFY_(pre_frame->verifier(), NULL)); | |
421 return NULL; | |
422 } |