Mercurial > hg > truffle
annotate src/share/vm/classfile/stackMapTable.cpp @ 2129:8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
Reviewed-by: mchung, acorn
author | kevinw |
---|---|
date | Wed, 12 Jan 2011 15:44:16 +0000 |
parents | f95d63e2154a |
children | 3582bf76420e |
rev | line source |
---|---|
0 | 1 /* |
1769 | 2 * Copyright (c) 2003, 2010, 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
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) { | |
49 frame->verifier()->verify_error("StackMapTable error: bad offset"); | |
50 return; | |
51 } | |
52 pre_frame = frame; | |
53 } | |
54 } | |
55 reader->check_end(CHECK); | |
56 } | |
57 | |
58 // This method is only called by method in StackMapTable. | |
59 int StackMapTable::get_index_from_offset(int32_t offset) const { | |
60 int i = 0; | |
61 for (; i < _frame_count; i++) { | |
62 if (_frame_array[i]->offset() == offset) { | |
63 return i; | |
64 } | |
65 } | |
66 return i; // frame with offset doesn't exist in the array | |
67 } | |
68 | |
69 bool StackMapTable::match_stackmap( | |
70 StackMapFrame* frame, int32_t target, | |
71 bool match, bool update, TRAPS) const { | |
72 int index = get_index_from_offset(target); | |
73 | |
74 return match_stackmap( | |
75 frame, target, index, match, | |
76 update, CHECK_VERIFY_(frame->verifier(), false)); | |
77 } | |
78 | |
79 // Match and/or update current_frame to the frame in stackmap table with | |
80 // specified offset and frame index. Return true if the two frames match. | |
81 // | |
82 // The values of match and update are: _match__update_ | |
83 // | |
84 // checking a branch target/exception handler: true false | |
85 // linear bytecode verification following an | |
86 // unconditional branch: false true | |
87 // linear bytecode verification not following an | |
88 // unconditional branch: true true | |
89 bool StackMapTable::match_stackmap( | |
90 StackMapFrame* frame, int32_t target, int32_t frame_index, | |
91 bool match, bool update, TRAPS) const { | |
92 if (frame_index < 0 || frame_index >= _frame_count) { | |
93 frame->verifier()->verify_error(frame->offset(), | |
94 "Expecting a stackmap frame at branch target %d", target); | |
95 return false; | |
96 } | |
97 | |
98 bool result = true; | |
99 StackMapFrame *stackmap_frame = _frame_array[frame_index]; | |
100 if (match) { | |
101 // Has direct control flow from last instruction, need to match the two | |
102 // frames. | |
103 result = frame->is_assignable_to( | |
104 stackmap_frame, CHECK_VERIFY_(frame->verifier(), false)); | |
105 } | |
106 if (update) { | |
107 // Use the frame in stackmap table as current frame | |
108 int lsize = stackmap_frame->locals_size(); | |
109 int ssize = stackmap_frame->stack_size(); | |
110 if (frame->locals_size() > lsize || frame->stack_size() > ssize) { | |
111 // Make sure unused type array items are all _bogus_type. | |
112 frame->reset(); | |
113 } | |
114 frame->set_locals_size(lsize); | |
115 frame->copy_locals(stackmap_frame); | |
116 frame->set_stack_size(ssize); | |
117 frame->copy_stack(stackmap_frame); | |
118 frame->set_flags(stackmap_frame->flags()); | |
119 } | |
120 return result; | |
121 } | |
122 | |
123 void StackMapTable::check_jump_target( | |
124 StackMapFrame* frame, int32_t target, TRAPS) const { | |
125 bool match = match_stackmap( | |
126 frame, target, true, false, CHECK_VERIFY(frame->verifier())); | |
127 if (!match || (target < 0 || target >= _code_length)) { | |
128 frame->verifier()->verify_error(frame->offset(), | |
129 "Inconsistent stackmap frames at branch target %d", target); | |
130 return; | |
131 } | |
132 // check if uninitialized objects exist on backward branches | |
133 check_new_object(frame, target, CHECK_VERIFY(frame->verifier())); | |
134 } | |
135 | |
136 void StackMapTable::check_new_object( | |
137 const StackMapFrame* frame, int32_t target, TRAPS) const { | |
138 if (frame->offset() > target && frame->has_new_object()) { | |
139 frame->verifier()->verify_error(frame->offset(), | |
140 "Uninitialized object exists on backward branch %d", target); | |
141 return; | |
142 } | |
143 } | |
144 | |
145 #ifndef PRODUCT | |
146 | |
147 void StackMapTable::print() const { | |
148 tty->print_cr("StackMapTable: frame_count = %d", _frame_count); | |
149 tty->print_cr("table = { "); | |
150 for (int32_t i = 0; i < _frame_count; i++) { | |
151 _frame_array[i]->print(); | |
152 } | |
153 tty->print_cr(" }"); | |
154 } | |
155 | |
156 #endif | |
157 | |
158 int32_t StackMapReader::chop( | |
159 VerificationType* locals, int32_t length, int32_t chops) { | |
1769 | 160 if (locals == NULL) return -1; |
0 | 161 int32_t pos = length - 1; |
162 for (int32_t i=0; i<chops; i++) { | |
163 if (locals[pos].is_category2_2nd()) { | |
164 pos -= 2; | |
165 } else { | |
166 pos --; | |
167 } | |
168 if (pos<0 && i<(chops-1)) return -1; | |
169 } | |
170 return pos+1; | |
171 } | |
172 | |
173 VerificationType StackMapReader::parse_verification_type(u1* flags, TRAPS) { | |
174 u1 tag = _stream->get_u1(THREAD); | |
175 if (tag < (u1)ITEM_UninitializedThis) { | |
176 return VerificationType::from_tag(tag); | |
177 } | |
178 if (tag == ITEM_Object) { | |
179 u2 class_index = _stream->get_u2(THREAD); | |
180 int nconstants = _cp->length(); | |
181 if ((class_index <= 0 || class_index >= nconstants) || | |
182 (!_cp->tag_at(class_index).is_klass() && | |
183 !_cp->tag_at(class_index).is_unresolved_klass())) { | |
184 _stream->stackmap_format_error("bad class index", THREAD); | |
185 return VerificationType::bogus_type(); | |
186 } | |
187 return VerificationType::reference_type( | |
188 symbolHandle(THREAD, _cp->klass_name_at(class_index))); | |
189 } | |
190 if (tag == ITEM_UninitializedThis) { | |
191 if (flags != NULL) { | |
192 *flags |= FLAG_THIS_UNINIT; | |
193 } | |
194 return VerificationType::uninitialized_this_type(); | |
195 } | |
196 if (tag == ITEM_Uninitialized) { | |
197 u2 offset = _stream->get_u2(THREAD); | |
198 if (offset >= _code_length || | |
199 _code_data[offset] != ClassVerifier::NEW_OFFSET) { | |
200 ResourceMark rm(THREAD); | |
201 _verifier->class_format_error( | |
202 "StackMapTable format error: bad offset for Uninitialized"); | |
203 return VerificationType::bogus_type(); | |
204 } | |
205 return VerificationType::uninitialized_type(offset); | |
206 } | |
207 _stream->stackmap_format_error("bad verification type", THREAD); | |
208 return VerificationType::bogus_type(); | |
209 } | |
210 | |
211 StackMapFrame* StackMapReader::next( | |
212 StackMapFrame* pre_frame, bool first, u2 max_locals, u2 max_stack, TRAPS) { | |
213 StackMapFrame* frame; | |
214 int offset; | |
215 VerificationType* locals = NULL; | |
216 u1 frame_type = _stream->get_u1(THREAD); | |
217 if (frame_type < 64) { | |
218 // same_frame | |
219 if (first) { | |
220 offset = frame_type; | |
221 // Can't share the locals array since that is updated by the verifier. | |
222 if (pre_frame->locals_size() > 0) { | |
223 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
224 THREAD, VerificationType, pre_frame->locals_size()); | |
225 } | |
226 } else { | |
227 offset = pre_frame->offset() + frame_type + 1; | |
228 locals = pre_frame->locals(); | |
229 } | |
230 frame = new StackMapFrame( | |
231 offset, pre_frame->flags(), pre_frame->locals_size(), 0, | |
232 max_locals, max_stack, locals, NULL, _verifier); | |
233 if (first && locals != NULL) { | |
234 frame->copy_locals(pre_frame); | |
235 } | |
236 return frame; | |
237 } | |
238 if (frame_type < 128) { | |
239 // same_locals_1_stack_item_frame | |
240 if (first) { | |
241 offset = frame_type - 64; | |
242 // Can't share the locals array since that is updated by the verifier. | |
243 if (pre_frame->locals_size() > 0) { | |
244 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
245 THREAD, VerificationType, pre_frame->locals_size()); | |
246 } | |
247 } else { | |
248 offset = pre_frame->offset() + frame_type - 63; | |
249 locals = pre_frame->locals(); | |
250 } | |
251 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
252 THREAD, VerificationType, 2); | |
253 u2 stack_size = 1; | |
254 stack[0] = parse_verification_type(NULL, CHECK_VERIFY_(_verifier, NULL)); | |
255 if (stack[0].is_category2()) { | |
256 stack[1] = stack[0].to_category2_2nd(); | |
257 stack_size = 2; | |
258 } | |
259 check_verification_type_array_size( | |
260 stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
261 frame = new StackMapFrame( | |
262 offset, pre_frame->flags(), pre_frame->locals_size(), stack_size, | |
263 max_locals, max_stack, locals, stack, _verifier); | |
264 if (first && locals != NULL) { | |
265 frame->copy_locals(pre_frame); | |
266 } | |
267 return frame; | |
268 } | |
269 | |
270 u2 offset_delta = _stream->get_u2(THREAD); | |
271 | |
272 if (frame_type < SAME_LOCALS_1_STACK_ITEM_EXTENDED) { | |
273 // reserved frame types | |
274 _stream->stackmap_format_error( | |
275 "reserved frame type", CHECK_VERIFY_(_verifier, NULL)); | |
276 } | |
277 | |
278 if (frame_type == SAME_LOCALS_1_STACK_ITEM_EXTENDED) { | |
279 // same_locals_1_stack_item_frame_extended | |
280 if (first) { | |
281 offset = offset_delta; | |
282 // Can't share the locals array since that is updated by the verifier. | |
283 if (pre_frame->locals_size() > 0) { | |
284 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
285 THREAD, VerificationType, pre_frame->locals_size()); | |
286 } | |
287 } else { | |
288 offset = pre_frame->offset() + offset_delta + 1; | |
289 locals = pre_frame->locals(); | |
290 } | |
291 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
292 THREAD, VerificationType, 2); | |
293 u2 stack_size = 1; | |
294 stack[0] = parse_verification_type(NULL, CHECK_VERIFY_(_verifier, NULL)); | |
295 if (stack[0].is_category2()) { | |
296 stack[1] = stack[0].to_category2_2nd(); | |
297 stack_size = 2; | |
298 } | |
299 check_verification_type_array_size( | |
300 stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
301 frame = new StackMapFrame( | |
302 offset, pre_frame->flags(), pre_frame->locals_size(), stack_size, | |
303 max_locals, max_stack, locals, stack, _verifier); | |
304 if (first && locals != NULL) { | |
305 frame->copy_locals(pre_frame); | |
306 } | |
307 return frame; | |
308 } | |
309 | |
310 if (frame_type <= SAME_EXTENDED) { | |
311 // chop_frame or same_frame_extended | |
312 locals = pre_frame->locals(); | |
313 int length = pre_frame->locals_size(); | |
314 int chops = SAME_EXTENDED - frame_type; | |
315 int new_length = length; | |
316 u1 flags = pre_frame->flags(); | |
317 if (chops != 0) { | |
318 new_length = chop(locals, length, chops); | |
319 check_verification_type_array_size( | |
320 new_length, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
321 // Recompute flags since uninitializedThis could have been chopped. | |
322 flags = 0; | |
323 for (int i=0; i<new_length; i++) { | |
324 if (locals[i].is_uninitialized_this()) { | |
325 flags |= FLAG_THIS_UNINIT; | |
326 break; | |
327 } | |
328 } | |
329 } | |
330 if (first) { | |
331 offset = offset_delta; | |
332 // Can't share the locals array since that is updated by the verifier. | |
333 if (new_length > 0) { | |
334 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
335 THREAD, VerificationType, new_length); | |
336 } else { | |
337 locals = NULL; | |
338 } | |
339 } else { | |
340 offset = pre_frame->offset() + offset_delta + 1; | |
341 } | |
342 frame = new StackMapFrame( | |
343 offset, flags, new_length, 0, max_locals, max_stack, | |
344 locals, NULL, _verifier); | |
345 if (first && locals != NULL) { | |
346 frame->copy_locals(pre_frame); | |
347 } | |
348 return frame; | |
349 } else if (frame_type < SAME_EXTENDED + 4) { | |
350 // append_frame | |
351 int appends = frame_type - SAME_EXTENDED; | |
352 int real_length = pre_frame->locals_size(); | |
353 int new_length = real_length + appends*2; | |
354 locals = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, new_length); | |
355 VerificationType* pre_locals = pre_frame->locals(); | |
356 int i; | |
357 for (i=0; i<pre_frame->locals_size(); i++) { | |
358 locals[i] = pre_locals[i]; | |
359 } | |
360 u1 flags = pre_frame->flags(); | |
361 for (i=0; i<appends; i++) { | |
362 locals[real_length] = parse_verification_type(&flags, THREAD); | |
363 if (locals[real_length].is_category2()) { | |
364 locals[real_length + 1] = locals[real_length].to_category2_2nd(); | |
365 ++real_length; | |
366 } | |
367 ++real_length; | |
368 } | |
369 check_verification_type_array_size( | |
370 real_length, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
371 if (first) { | |
372 offset = offset_delta; | |
373 } else { | |
374 offset = pre_frame->offset() + offset_delta + 1; | |
375 } | |
376 frame = new StackMapFrame( | |
377 offset, flags, real_length, 0, max_locals, | |
378 max_stack, locals, NULL, _verifier); | |
379 return frame; | |
380 } | |
381 if (frame_type == FULL) { | |
382 // full_frame | |
383 u1 flags = 0; | |
384 u2 locals_size = _stream->get_u2(THREAD); | |
385 int real_locals_size = 0; | |
386 if (locals_size > 0) { | |
387 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
388 THREAD, VerificationType, locals_size*2); | |
389 } | |
390 int i; | |
391 for (i=0; i<locals_size; i++) { | |
392 locals[real_locals_size] = parse_verification_type(&flags, THREAD); | |
393 if (locals[real_locals_size].is_category2()) { | |
394 locals[real_locals_size + 1] = | |
395 locals[real_locals_size].to_category2_2nd(); | |
396 ++real_locals_size; | |
397 } | |
398 ++real_locals_size; | |
399 } | |
400 check_verification_type_array_size( | |
401 real_locals_size, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
402 u2 stack_size = _stream->get_u2(THREAD); | |
403 int real_stack_size = 0; | |
404 VerificationType* stack = NULL; | |
405 if (stack_size > 0) { | |
406 stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
407 THREAD, VerificationType, stack_size*2); | |
408 } | |
409 for (i=0; i<stack_size; i++) { | |
410 stack[real_stack_size] = parse_verification_type(NULL, THREAD); | |
411 if (stack[real_stack_size].is_category2()) { | |
412 stack[real_stack_size + 1] = stack[real_stack_size].to_category2_2nd(); | |
413 ++real_stack_size; | |
414 } | |
415 ++real_stack_size; | |
416 } | |
417 check_verification_type_array_size( | |
418 real_stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
419 if (first) { | |
420 offset = offset_delta; | |
421 } else { | |
422 offset = pre_frame->offset() + offset_delta + 1; | |
423 } | |
424 frame = new StackMapFrame( | |
425 offset, flags, real_locals_size, real_stack_size, | |
426 max_locals, max_stack, locals, stack, _verifier); | |
427 return frame; | |
428 } | |
429 | |
430 _stream->stackmap_format_error( | |
431 "reserved frame type", CHECK_VERIFY_(pre_frame->verifier(), NULL)); | |
432 return NULL; | |
433 } |