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annotate src/share/vm/oops/generateOopMap.cpp @ 4439:f7251c729b31
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author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Thu, 19 Jan 2012 16:29:35 -0800 |
parents | 9f12ede5571a |
children | 8150fa46d2ed |
rev | line source |
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0 | 1 /* |
2142 | 2 * Copyright (c) 1997, 2011, 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
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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 "interpreter/bytecodeStream.hpp" | |
27 #include "oops/generateOopMap.hpp" | |
28 #include "oops/oop.inline.hpp" | |
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29 #include "oops/symbol.hpp" |
1972 | 30 #include "runtime/handles.inline.hpp" |
31 #include "runtime/java.hpp" | |
32 #include "runtime/relocator.hpp" | |
33 #include "utilities/bitMap.inline.hpp" | |
34 | |
0 | 35 // |
36 // | |
37 // Compute stack layouts for each instruction in method. | |
38 // | |
39 // Problems: | |
40 // - What to do about jsr with different types of local vars? | |
41 // Need maps that are conditional on jsr path? | |
42 // - Jsr and exceptions should be done more efficiently (the retAddr stuff) | |
43 // | |
44 // Alternative: | |
45 // - Could extend verifier to provide this information. | |
46 // For: one fewer abstract interpreter to maintain. Against: the verifier | |
47 // solves a bigger problem so slower (undesirable to force verification of | |
48 // everything?). | |
49 // | |
50 // Algorithm: | |
51 // Partition bytecodes into basic blocks | |
52 // For each basic block: store entry state (vars, stack). For instructions | |
53 // inside basic blocks we do not store any state (instead we recompute it | |
54 // from state produced by previous instruction). | |
55 // | |
56 // Perform abstract interpretation of bytecodes over this lattice: | |
57 // | |
58 // _--'#'--_ | |
59 // / / \ \ | |
60 // / / \ \ | |
61 // / | | \ | |
62 // 'r' 'v' 'p' ' ' | |
63 // \ | | / | |
64 // \ \ / / | |
65 // \ \ / / | |
66 // -- '@' -- | |
67 // | |
68 // '#' top, result of conflict merge | |
69 // 'r' reference type | |
70 // 'v' value type | |
71 // 'p' pc type for jsr/ret | |
72 // ' ' uninitialized; never occurs on operand stack in Java | |
73 // '@' bottom/unexecuted; initial state each bytecode. | |
74 // | |
75 // Basic block headers are the only merge points. We use this iteration to | |
76 // compute the information: | |
77 // | |
78 // find basic blocks; | |
79 // initialize them with uninitialized state; | |
80 // initialize first BB according to method signature; | |
81 // mark first BB changed | |
82 // while (some BB is changed) do { | |
83 // perform abstract interpration of all bytecodes in BB; | |
84 // merge exit state of BB into entry state of all successor BBs, | |
85 // noting if any of these change; | |
86 // } | |
87 // | |
88 // One additional complication is necessary. The jsr instruction pushes | |
89 // a return PC on the stack (a 'p' type in the abstract interpretation). | |
90 // To be able to process "ret" bytecodes, we keep track of these return | |
91 // PC's in a 'retAddrs' structure in abstract interpreter context (when | |
92 // processing a "ret" bytecodes, it is not sufficient to know that it gets | |
93 // an argument of the right type 'p'; we need to know which address it | |
94 // returns to). | |
95 // | |
96 // (Note this comment is borrowed form the original author of the algorithm) | |
97 | |
98 // ComputeCallStack | |
99 // | |
100 // Specialization of SignatureIterator - compute the effects of a call | |
101 // | |
102 class ComputeCallStack : public SignatureIterator { | |
103 CellTypeState *_effect; | |
104 int _idx; | |
105 | |
106 void setup(); | |
107 void set(CellTypeState state) { _effect[_idx++] = state; } | |
108 int length() { return _idx; }; | |
109 | |
110 virtual void do_bool () { set(CellTypeState::value); }; | |
111 virtual void do_char () { set(CellTypeState::value); }; | |
112 virtual void do_float () { set(CellTypeState::value); }; | |
113 virtual void do_byte () { set(CellTypeState::value); }; | |
114 virtual void do_short () { set(CellTypeState::value); }; | |
115 virtual void do_int () { set(CellTypeState::value); }; | |
116 virtual void do_void () { set(CellTypeState::bottom);}; | |
117 virtual void do_object(int begin, int end) { set(CellTypeState::ref); }; | |
118 virtual void do_array (int begin, int end) { set(CellTypeState::ref); }; | |
119 | |
120 void do_double() { set(CellTypeState::value); | |
121 set(CellTypeState::value); } | |
122 void do_long () { set(CellTypeState::value); | |
123 set(CellTypeState::value); } | |
124 | |
125 public: | |
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126 ComputeCallStack(Symbol* signature) : SignatureIterator(signature) {}; |
0 | 127 |
128 // Compute methods | |
129 int compute_for_parameters(bool is_static, CellTypeState *effect) { | |
130 _idx = 0; | |
131 _effect = effect; | |
132 | |
133 if (!is_static) | |
134 effect[_idx++] = CellTypeState::ref; | |
135 | |
136 iterate_parameters(); | |
137 | |
138 return length(); | |
139 }; | |
140 | |
141 int compute_for_returntype(CellTypeState *effect) { | |
142 _idx = 0; | |
143 _effect = effect; | |
144 iterate_returntype(); | |
145 set(CellTypeState::bottom); // Always terminate with a bottom state, so ppush works | |
146 | |
147 return length(); | |
148 } | |
149 }; | |
150 | |
151 //========================================================================================= | |
152 // ComputeEntryStack | |
153 // | |
154 // Specialization of SignatureIterator - in order to set up first stack frame | |
155 // | |
156 class ComputeEntryStack : public SignatureIterator { | |
157 CellTypeState *_effect; | |
158 int _idx; | |
159 | |
160 void setup(); | |
161 void set(CellTypeState state) { _effect[_idx++] = state; } | |
162 int length() { return _idx; }; | |
163 | |
164 virtual void do_bool () { set(CellTypeState::value); }; | |
165 virtual void do_char () { set(CellTypeState::value); }; | |
166 virtual void do_float () { set(CellTypeState::value); }; | |
167 virtual void do_byte () { set(CellTypeState::value); }; | |
168 virtual void do_short () { set(CellTypeState::value); }; | |
169 virtual void do_int () { set(CellTypeState::value); }; | |
170 virtual void do_void () { set(CellTypeState::bottom);}; | |
171 virtual void do_object(int begin, int end) { set(CellTypeState::make_slot_ref(_idx)); } | |
172 virtual void do_array (int begin, int end) { set(CellTypeState::make_slot_ref(_idx)); } | |
173 | |
174 void do_double() { set(CellTypeState::value); | |
175 set(CellTypeState::value); } | |
176 void do_long () { set(CellTypeState::value); | |
177 set(CellTypeState::value); } | |
178 | |
179 public: | |
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180 ComputeEntryStack(Symbol* signature) : SignatureIterator(signature) {}; |
0 | 181 |
182 // Compute methods | |
183 int compute_for_parameters(bool is_static, CellTypeState *effect) { | |
184 _idx = 0; | |
185 _effect = effect; | |
186 | |
187 if (!is_static) | |
188 effect[_idx++] = CellTypeState::make_slot_ref(0); | |
189 | |
190 iterate_parameters(); | |
191 | |
192 return length(); | |
193 }; | |
194 | |
195 int compute_for_returntype(CellTypeState *effect) { | |
196 _idx = 0; | |
197 _effect = effect; | |
198 iterate_returntype(); | |
199 set(CellTypeState::bottom); // Always terminate with a bottom state, so ppush works | |
200 | |
201 return length(); | |
202 } | |
203 }; | |
204 | |
205 //===================================================================================== | |
206 // | |
207 // Implementation of RetTable/RetTableEntry | |
208 // | |
209 // Contains function to itereate through all bytecodes | |
210 // and find all return entry points | |
211 // | |
212 int RetTable::_init_nof_entries = 10; | |
213 int RetTableEntry::_init_nof_jsrs = 5; | |
214 | |
215 void RetTableEntry::add_delta(int bci, int delta) { | |
216 if (_target_bci > bci) _target_bci += delta; | |
217 | |
218 for (int k = 0; k < _jsrs->length(); k++) { | |
219 int jsr = _jsrs->at(k); | |
220 if (jsr > bci) _jsrs->at_put(k, jsr+delta); | |
221 } | |
222 } | |
223 | |
224 void RetTable::compute_ret_table(methodHandle method) { | |
225 BytecodeStream i(method); | |
226 Bytecodes::Code bytecode; | |
227 | |
228 while( (bytecode = i.next()) >= 0) { | |
229 switch (bytecode) { | |
230 case Bytecodes::_jsr: | |
231 add_jsr(i.next_bci(), i.dest()); | |
232 break; | |
233 case Bytecodes::_jsr_w: | |
234 add_jsr(i.next_bci(), i.dest_w()); | |
235 break; | |
236 } | |
237 } | |
238 } | |
239 | |
240 void RetTable::add_jsr(int return_bci, int target_bci) { | |
241 RetTableEntry* entry = _first; | |
242 | |
243 // Scan table for entry | |
244 for (;entry && entry->target_bci() != target_bci; entry = entry->next()); | |
245 | |
246 if (!entry) { | |
247 // Allocate new entry and put in list | |
248 entry = new RetTableEntry(target_bci, _first); | |
249 _first = entry; | |
250 } | |
251 | |
252 // Now "entry" is set. Make sure that the entry is initialized | |
253 // and has room for the new jsr. | |
254 entry->add_jsr(return_bci); | |
255 } | |
256 | |
257 RetTableEntry* RetTable::find_jsrs_for_target(int targBci) { | |
258 RetTableEntry *cur = _first; | |
259 | |
260 while(cur) { | |
261 assert(cur->target_bci() != -1, "sanity check"); | |
262 if (cur->target_bci() == targBci) return cur; | |
263 cur = cur->next(); | |
264 } | |
265 ShouldNotReachHere(); | |
266 return NULL; | |
267 } | |
268 | |
269 // The instruction at bci is changing size by "delta". Update the return map. | |
270 void RetTable::update_ret_table(int bci, int delta) { | |
271 RetTableEntry *cur = _first; | |
272 while(cur) { | |
273 cur->add_delta(bci, delta); | |
274 cur = cur->next(); | |
275 } | |
276 } | |
277 | |
278 // | |
279 // Celltype state | |
280 // | |
281 | |
282 CellTypeState CellTypeState::bottom = CellTypeState::make_bottom(); | |
283 CellTypeState CellTypeState::uninit = CellTypeState::make_any(uninit_value); | |
284 CellTypeState CellTypeState::ref = CellTypeState::make_any(ref_conflict); | |
285 CellTypeState CellTypeState::value = CellTypeState::make_any(val_value); | |
286 CellTypeState CellTypeState::refUninit = CellTypeState::make_any(ref_conflict | uninit_value); | |
287 CellTypeState CellTypeState::top = CellTypeState::make_top(); | |
288 CellTypeState CellTypeState::addr = CellTypeState::make_any(addr_conflict); | |
289 | |
290 // Commonly used constants | |
291 static CellTypeState epsilonCTS[1] = { CellTypeState::bottom }; | |
292 static CellTypeState refCTS = CellTypeState::ref; | |
293 static CellTypeState valCTS = CellTypeState::value; | |
294 static CellTypeState vCTS[2] = { CellTypeState::value, CellTypeState::bottom }; | |
295 static CellTypeState rCTS[2] = { CellTypeState::ref, CellTypeState::bottom }; | |
296 static CellTypeState rrCTS[3] = { CellTypeState::ref, CellTypeState::ref, CellTypeState::bottom }; | |
297 static CellTypeState vrCTS[3] = { CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; | |
298 static CellTypeState vvCTS[3] = { CellTypeState::value, CellTypeState::value, CellTypeState::bottom }; | |
299 static CellTypeState rvrCTS[4] = { CellTypeState::ref, CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; | |
300 static CellTypeState vvrCTS[4] = { CellTypeState::value, CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; | |
301 static CellTypeState vvvCTS[4] = { CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::bottom }; | |
302 static CellTypeState vvvrCTS[5] = { CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::ref, CellTypeState::bottom }; | |
303 static CellTypeState vvvvCTS[5] = { CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::value, CellTypeState::bottom }; | |
304 | |
305 char CellTypeState::to_char() const { | |
306 if (can_be_reference()) { | |
307 if (can_be_value() || can_be_address()) | |
308 return '#'; // Conflict that needs to be rewritten | |
309 else | |
310 return 'r'; | |
311 } else if (can_be_value()) | |
312 return 'v'; | |
313 else if (can_be_address()) | |
314 return 'p'; | |
315 else if (can_be_uninit()) | |
316 return ' '; | |
317 else | |
318 return '@'; | |
319 } | |
320 | |
321 | |
322 // Print a detailed CellTypeState. Indicate all bits that are set. If | |
323 // the CellTypeState represents an address or a reference, print the | |
324 // value of the additional information. | |
325 void CellTypeState::print(outputStream *os) { | |
326 if (can_be_address()) { | |
327 os->print("(p"); | |
328 } else { | |
329 os->print("( "); | |
330 } | |
331 if (can_be_reference()) { | |
332 os->print("r"); | |
333 } else { | |
334 os->print(" "); | |
335 } | |
336 if (can_be_value()) { | |
337 os->print("v"); | |
338 } else { | |
339 os->print(" "); | |
340 } | |
341 if (can_be_uninit()) { | |
342 os->print("u|"); | |
343 } else { | |
344 os->print(" |"); | |
345 } | |
346 if (is_info_top()) { | |
347 os->print("Top)"); | |
348 } else if (is_info_bottom()) { | |
349 os->print("Bot)"); | |
350 } else { | |
351 if (is_reference()) { | |
352 int info = get_info(); | |
353 int data = info & ~(ref_not_lock_bit | ref_slot_bit); | |
354 if (info & ref_not_lock_bit) { | |
355 // Not a monitor lock reference. | |
356 if (info & ref_slot_bit) { | |
357 // slot | |
358 os->print("slot%d)", data); | |
359 } else { | |
360 // line | |
361 os->print("line%d)", data); | |
362 } | |
363 } else { | |
364 // lock | |
365 os->print("lock%d)", data); | |
366 } | |
367 } else { | |
368 os->print("%d)", get_info()); | |
369 } | |
370 } | |
371 } | |
372 | |
373 // | |
374 // Basicblock handling methods | |
375 // | |
376 | |
377 void GenerateOopMap ::initialize_bb() { | |
378 _gc_points = 0; | |
379 _bb_count = 0; | |
342 | 380 _bb_hdr_bits.clear(); |
381 _bb_hdr_bits.resize(method()->code_size()); | |
0 | 382 } |
383 | |
384 void GenerateOopMap::bb_mark_fct(GenerateOopMap *c, int bci, int *data) { | |
385 assert(bci>= 0 && bci < c->method()->code_size(), "index out of bounds"); | |
386 if (c->is_bb_header(bci)) | |
387 return; | |
388 | |
389 if (TraceNewOopMapGeneration) { | |
390 tty->print_cr("Basicblock#%d begins at: %d", c->_bb_count, bci); | |
391 } | |
392 c->set_bbmark_bit(bci); | |
393 c->_bb_count++; | |
394 } | |
395 | |
396 | |
397 void GenerateOopMap::mark_bbheaders_and_count_gc_points() { | |
398 initialize_bb(); | |
399 | |
400 bool fellThrough = false; // False to get first BB marked. | |
401 | |
402 // First mark all exception handlers as start of a basic-block | |
403 typeArrayOop excps = method()->exception_table(); | |
404 for(int i = 0; i < excps->length(); i += 4) { | |
405 int handler_pc_idx = i+2; | |
406 bb_mark_fct(this, excps->int_at(handler_pc_idx), NULL); | |
407 } | |
408 | |
409 // Then iterate through the code | |
410 BytecodeStream bcs(_method); | |
411 Bytecodes::Code bytecode; | |
412 | |
413 while( (bytecode = bcs.next()) >= 0) { | |
414 int bci = bcs.bci(); | |
415 | |
416 if (!fellThrough) | |
417 bb_mark_fct(this, bci, NULL); | |
418 | |
419 fellThrough = jump_targets_do(&bcs, &GenerateOopMap::bb_mark_fct, NULL); | |
420 | |
421 /* We will also mark successors of jsr's as basic block headers. */ | |
422 switch (bytecode) { | |
423 case Bytecodes::_jsr: | |
424 assert(!fellThrough, "should not happen"); | |
425 bb_mark_fct(this, bci + Bytecodes::length_for(bytecode), NULL); | |
426 break; | |
427 case Bytecodes::_jsr_w: | |
428 assert(!fellThrough, "should not happen"); | |
429 bb_mark_fct(this, bci + Bytecodes::length_for(bytecode), NULL); | |
430 break; | |
431 } | |
432 | |
433 if (possible_gc_point(&bcs)) | |
434 _gc_points++; | |
435 } | |
436 } | |
437 | |
438 void GenerateOopMap::reachable_basicblock(GenerateOopMap *c, int bci, int *data) { | |
439 assert(bci>= 0 && bci < c->method()->code_size(), "index out of bounds"); | |
440 BasicBlock* bb = c->get_basic_block_at(bci); | |
441 if (bb->is_dead()) { | |
442 bb->mark_as_alive(); | |
443 *data = 1; // Mark basicblock as changed | |
444 } | |
445 } | |
446 | |
447 | |
448 void GenerateOopMap::mark_reachable_code() { | |
449 int change = 1; // int to get function pointers to work | |
450 | |
451 // Mark entry basic block as alive and all exception handlers | |
452 _basic_blocks[0].mark_as_alive(); | |
453 typeArrayOop excps = method()->exception_table(); | |
454 for(int i = 0; i < excps->length(); i += 4) { | |
455 int handler_pc_idx = i+2; | |
456 BasicBlock *bb = get_basic_block_at(excps->int_at(handler_pc_idx)); | |
457 // If block is not already alive (due to multiple exception handlers to same bb), then | |
458 // make it alive | |
459 if (bb->is_dead()) bb->mark_as_alive(); | |
460 } | |
461 | |
462 BytecodeStream bcs(_method); | |
463 | |
464 // Iterate through all basic blocks until we reach a fixpoint | |
465 while (change) { | |
466 change = 0; | |
467 | |
468 for (int i = 0; i < _bb_count; i++) { | |
469 BasicBlock *bb = &_basic_blocks[i]; | |
470 if (bb->is_alive()) { | |
471 // Position bytecodestream at last bytecode in basicblock | |
472 bcs.set_start(bb->_end_bci); | |
473 bcs.next(); | |
474 Bytecodes::Code bytecode = bcs.code(); | |
475 int bci = bcs.bci(); | |
476 assert(bci == bb->_end_bci, "wrong bci"); | |
477 | |
478 bool fell_through = jump_targets_do(&bcs, &GenerateOopMap::reachable_basicblock, &change); | |
479 | |
480 // We will also mark successors of jsr's as alive. | |
481 switch (bytecode) { | |
482 case Bytecodes::_jsr: | |
483 case Bytecodes::_jsr_w: | |
484 assert(!fell_through, "should not happen"); | |
485 reachable_basicblock(this, bci + Bytecodes::length_for(bytecode), &change); | |
486 break; | |
487 } | |
488 if (fell_through) { | |
489 // Mark successor as alive | |
490 if (bb[1].is_dead()) { | |
491 bb[1].mark_as_alive(); | |
492 change = 1; | |
493 } | |
494 } | |
495 } | |
496 } | |
497 } | |
498 } | |
499 | |
500 /* If the current instruction in "c" has no effect on control flow, | |
501 returns "true". Otherwise, calls "jmpFct" one or more times, with | |
502 "c", an appropriate "pcDelta", and "data" as arguments, then | |
503 returns "false". There is one exception: if the current | |
504 instruction is a "ret", returns "false" without calling "jmpFct". | |
505 Arrangements for tracking the control flow of a "ret" must be made | |
506 externally. */ | |
507 bool GenerateOopMap::jump_targets_do(BytecodeStream *bcs, jmpFct_t jmpFct, int *data) { | |
508 int bci = bcs->bci(); | |
509 | |
510 switch (bcs->code()) { | |
511 case Bytecodes::_ifeq: | |
512 case Bytecodes::_ifne: | |
513 case Bytecodes::_iflt: | |
514 case Bytecodes::_ifge: | |
515 case Bytecodes::_ifgt: | |
516 case Bytecodes::_ifle: | |
517 case Bytecodes::_if_icmpeq: | |
518 case Bytecodes::_if_icmpne: | |
519 case Bytecodes::_if_icmplt: | |
520 case Bytecodes::_if_icmpge: | |
521 case Bytecodes::_if_icmpgt: | |
522 case Bytecodes::_if_icmple: | |
523 case Bytecodes::_if_acmpeq: | |
524 case Bytecodes::_if_acmpne: | |
525 case Bytecodes::_ifnull: | |
526 case Bytecodes::_ifnonnull: | |
527 (*jmpFct)(this, bcs->dest(), data); | |
528 (*jmpFct)(this, bci + 3, data); | |
529 break; | |
530 | |
531 case Bytecodes::_goto: | |
532 (*jmpFct)(this, bcs->dest(), data); | |
533 break; | |
534 case Bytecodes::_goto_w: | |
535 (*jmpFct)(this, bcs->dest_w(), data); | |
536 break; | |
537 case Bytecodes::_tableswitch: | |
2142 | 538 { Bytecode_tableswitch tableswitch(method(), bcs->bcp()); |
539 int len = tableswitch.length(); | |
0 | 540 |
2142 | 541 (*jmpFct)(this, bci + tableswitch.default_offset(), data); /* Default. jump address */ |
0 | 542 while (--len >= 0) { |
2142 | 543 (*jmpFct)(this, bci + tableswitch.dest_offset_at(len), data); |
0 | 544 } |
545 break; | |
546 } | |
547 | |
548 case Bytecodes::_lookupswitch: | |
2142 | 549 { Bytecode_lookupswitch lookupswitch(method(), bcs->bcp()); |
550 int npairs = lookupswitch.number_of_pairs(); | |
551 (*jmpFct)(this, bci + lookupswitch.default_offset(), data); /* Default. */ | |
0 | 552 while(--npairs >= 0) { |
2142 | 553 LookupswitchPair pair = lookupswitch.pair_at(npairs); |
554 (*jmpFct)(this, bci + pair.offset(), data); | |
0 | 555 } |
556 break; | |
557 } | |
558 case Bytecodes::_jsr: | |
559 assert(bcs->is_wide()==false, "sanity check"); | |
560 (*jmpFct)(this, bcs->dest(), data); | |
561 | |
562 | |
563 | |
564 break; | |
565 case Bytecodes::_jsr_w: | |
566 (*jmpFct)(this, bcs->dest_w(), data); | |
567 break; | |
568 case Bytecodes::_wide: | |
569 ShouldNotReachHere(); | |
570 return true; | |
571 break; | |
572 case Bytecodes::_athrow: | |
573 case Bytecodes::_ireturn: | |
574 case Bytecodes::_lreturn: | |
575 case Bytecodes::_freturn: | |
576 case Bytecodes::_dreturn: | |
577 case Bytecodes::_areturn: | |
578 case Bytecodes::_return: | |
579 case Bytecodes::_ret: | |
580 break; | |
581 default: | |
582 return true; | |
583 } | |
584 return false; | |
585 } | |
586 | |
587 /* Requires "pc" to be the head of a basic block; returns that basic | |
588 block. */ | |
589 BasicBlock *GenerateOopMap::get_basic_block_at(int bci) const { | |
590 BasicBlock* bb = get_basic_block_containing(bci); | |
591 assert(bb->_bci == bci, "should have found BB"); | |
592 return bb; | |
593 } | |
594 | |
595 // Requires "pc" to be the start of an instruction; returns the basic | |
596 // block containing that instruction. */ | |
597 BasicBlock *GenerateOopMap::get_basic_block_containing(int bci) const { | |
598 BasicBlock *bbs = _basic_blocks; | |
599 int lo = 0, hi = _bb_count - 1; | |
600 | |
601 while (lo <= hi) { | |
602 int m = (lo + hi) / 2; | |
603 int mbci = bbs[m]._bci; | |
604 int nbci; | |
605 | |
606 if ( m == _bb_count-1) { | |
607 assert( bci >= mbci && bci < method()->code_size(), "sanity check failed"); | |
608 return bbs+m; | |
609 } else { | |
610 nbci = bbs[m+1]._bci; | |
611 } | |
612 | |
613 if ( mbci <= bci && bci < nbci) { | |
614 return bbs+m; | |
615 } else if (mbci < bci) { | |
616 lo = m + 1; | |
617 } else { | |
618 assert(mbci > bci, "sanity check"); | |
619 hi = m - 1; | |
620 } | |
621 } | |
622 | |
623 fatal("should have found BB"); | |
624 return NULL; | |
625 } | |
626 | |
627 void GenerateOopMap::restore_state(BasicBlock *bb) | |
628 { | |
629 memcpy(_state, bb->_state, _state_len*sizeof(CellTypeState)); | |
630 _stack_top = bb->_stack_top; | |
631 _monitor_top = bb->_monitor_top; | |
632 } | |
633 | |
634 int GenerateOopMap::next_bb_start_pc(BasicBlock *bb) { | |
635 int bbNum = bb - _basic_blocks + 1; | |
636 if (bbNum == _bb_count) | |
637 return method()->code_size(); | |
638 | |
639 return _basic_blocks[bbNum]._bci; | |
640 } | |
641 | |
642 // | |
643 // CellType handling methods | |
644 // | |
645 | |
646 void GenerateOopMap::init_state() { | |
647 _state_len = _max_locals + _max_stack + _max_monitors; | |
648 _state = NEW_RESOURCE_ARRAY(CellTypeState, _state_len); | |
649 memset(_state, 0, _state_len * sizeof(CellTypeState)); | |
650 _state_vec_buf = NEW_RESOURCE_ARRAY(char, MAX3(_max_locals, _max_stack, _max_monitors) + 1/*for null terminator char */); | |
651 } | |
652 | |
653 void GenerateOopMap::make_context_uninitialized() { | |
654 CellTypeState* vs = vars(); | |
655 | |
656 for (int i = 0; i < _max_locals; i++) | |
657 vs[i] = CellTypeState::uninit; | |
658 | |
659 _stack_top = 0; | |
660 _monitor_top = 0; | |
661 } | |
662 | |
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663 int GenerateOopMap::methodsig_to_effect(Symbol* signature, bool is_static, CellTypeState* effect) { |
0 | 664 ComputeEntryStack ces(signature); |
665 return ces.compute_for_parameters(is_static, effect); | |
666 } | |
667 | |
668 // Return result of merging cts1 and cts2. | |
669 CellTypeState CellTypeState::merge(CellTypeState cts, int slot) const { | |
670 CellTypeState result; | |
671 | |
672 assert(!is_bottom() && !cts.is_bottom(), | |
673 "merge of bottom values is handled elsewhere"); | |
674 | |
675 result._state = _state | cts._state; | |
676 | |
677 // If the top bit is set, we don't need to do any more work. | |
678 if (!result.is_info_top()) { | |
679 assert((result.can_be_address() || result.can_be_reference()), | |
680 "only addresses and references have non-top info"); | |
681 | |
682 if (!equal(cts)) { | |
683 // The two values being merged are different. Raise to top. | |
684 if (result.is_reference()) { | |
685 result = CellTypeState::make_slot_ref(slot); | |
686 } else { | |
687 result._state |= info_conflict; | |
688 } | |
689 } | |
690 } | |
691 assert(result.is_valid_state(), "checking that CTS merge maintains legal state"); | |
692 | |
693 return result; | |
694 } | |
695 | |
696 // Merge the variable state for locals and stack from cts into bbts. | |
697 bool GenerateOopMap::merge_local_state_vectors(CellTypeState* cts, | |
698 CellTypeState* bbts) { | |
699 int i; | |
700 int len = _max_locals + _stack_top; | |
701 bool change = false; | |
702 | |
703 for (i = len - 1; i >= 0; i--) { | |
704 CellTypeState v = cts[i].merge(bbts[i], i); | |
705 change = change || !v.equal(bbts[i]); | |
706 bbts[i] = v; | |
707 } | |
708 | |
709 return change; | |
710 } | |
711 | |
712 // Merge the monitor stack state from cts into bbts. | |
713 bool GenerateOopMap::merge_monitor_state_vectors(CellTypeState* cts, | |
714 CellTypeState* bbts) { | |
715 bool change = false; | |
716 if (_max_monitors > 0 && _monitor_top != bad_monitors) { | |
717 // If there are no monitors in the program, or there has been | |
718 // a monitor matching error before this point in the program, | |
719 // then we do not merge in the monitor state. | |
720 | |
721 int base = _max_locals + _max_stack; | |
722 int len = base + _monitor_top; | |
723 for (int i = len - 1; i >= base; i--) { | |
724 CellTypeState v = cts[i].merge(bbts[i], i); | |
725 | |
726 // Can we prove that, when there has been a change, it will already | |
727 // have been detected at this point? That would make this equal | |
728 // check here unnecessary. | |
729 change = change || !v.equal(bbts[i]); | |
730 bbts[i] = v; | |
731 } | |
732 } | |
733 | |
734 return change; | |
735 } | |
736 | |
737 void GenerateOopMap::copy_state(CellTypeState *dst, CellTypeState *src) { | |
738 int len = _max_locals + _stack_top; | |
739 for (int i = 0; i < len; i++) { | |
740 if (src[i].is_nonlock_reference()) { | |
741 dst[i] = CellTypeState::make_slot_ref(i); | |
742 } else { | |
743 dst[i] = src[i]; | |
744 } | |
745 } | |
746 if (_max_monitors > 0 && _monitor_top != bad_monitors) { | |
747 int base = _max_locals + _max_stack; | |
748 len = base + _monitor_top; | |
749 for (int i = base; i < len; i++) { | |
750 dst[i] = src[i]; | |
751 } | |
752 } | |
753 } | |
754 | |
755 | |
756 // Merge the states for the current block and the next. As long as a | |
757 // block is reachable the locals and stack must be merged. If the | |
758 // stack heights don't match then this is a verification error and | |
759 // it's impossible to interpret the code. Simultaneously monitor | |
760 // states are being check to see if they nest statically. If monitor | |
761 // depths match up then their states are merged. Otherwise the | |
762 // mismatch is simply recorded and interpretation continues since | |
763 // monitor matching is purely informational and doesn't say anything | |
764 // about the correctness of the code. | |
765 void GenerateOopMap::merge_state_into_bb(BasicBlock *bb) { | |
766 assert(bb->is_alive(), "merging state into a dead basicblock"); | |
767 | |
768 if (_stack_top == bb->_stack_top) { | |
769 // always merge local state even if monitors don't match. | |
770 if (merge_local_state_vectors(_state, bb->_state)) { | |
771 bb->set_changed(true); | |
772 } | |
773 if (_monitor_top == bb->_monitor_top) { | |
774 // monitors still match so continue merging monitor states. | |
775 if (merge_monitor_state_vectors(_state, bb->_state)) { | |
776 bb->set_changed(true); | |
777 } | |
778 } else { | |
779 if (TraceMonitorMismatch) { | |
780 report_monitor_mismatch("monitor stack height merge conflict"); | |
781 } | |
782 // When the monitor stacks are not matched, we set _monitor_top to | |
783 // bad_monitors. This signals that, from here on, the monitor stack cannot | |
784 // be trusted. In particular, monitorexit bytecodes may throw | |
785 // exceptions. We mark this block as changed so that the change | |
786 // propagates properly. | |
787 bb->_monitor_top = bad_monitors; | |
788 bb->set_changed(true); | |
789 _monitor_safe = false; | |
790 } | |
791 } else if (!bb->is_reachable()) { | |
792 // First time we look at this BB | |
793 copy_state(bb->_state, _state); | |
794 bb->_stack_top = _stack_top; | |
795 bb->_monitor_top = _monitor_top; | |
796 bb->set_changed(true); | |
797 } else { | |
798 verify_error("stack height conflict: %d vs. %d", _stack_top, bb->_stack_top); | |
799 } | |
800 } | |
801 | |
802 void GenerateOopMap::merge_state(GenerateOopMap *gom, int bci, int* data) { | |
803 gom->merge_state_into_bb(gom->get_basic_block_at(bci)); | |
804 } | |
805 | |
806 void GenerateOopMap::set_var(int localNo, CellTypeState cts) { | |
807 assert(cts.is_reference() || cts.is_value() || cts.is_address(), | |
808 "wrong celltypestate"); | |
809 if (localNo < 0 || localNo > _max_locals) { | |
810 verify_error("variable write error: r%d", localNo); | |
811 return; | |
812 } | |
813 vars()[localNo] = cts; | |
814 } | |
815 | |
816 CellTypeState GenerateOopMap::get_var(int localNo) { | |
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817 assert(localNo < _max_locals + _nof_refval_conflicts, "variable read error"); |
0 | 818 if (localNo < 0 || localNo > _max_locals) { |
819 verify_error("variable read error: r%d", localNo); | |
820 return valCTS; // just to pick something; | |
821 } | |
822 return vars()[localNo]; | |
823 } | |
824 | |
825 CellTypeState GenerateOopMap::pop() { | |
826 if ( _stack_top <= 0) { | |
827 verify_error("stack underflow"); | |
828 return valCTS; // just to pick something | |
829 } | |
830 return stack()[--_stack_top]; | |
831 } | |
832 | |
833 void GenerateOopMap::push(CellTypeState cts) { | |
834 if ( _stack_top >= _max_stack) { | |
835 verify_error("stack overflow"); | |
836 return; | |
837 } | |
838 stack()[_stack_top++] = cts; | |
839 } | |
840 | |
841 CellTypeState GenerateOopMap::monitor_pop() { | |
842 assert(_monitor_top != bad_monitors, "monitor_pop called on error monitor stack"); | |
843 if (_monitor_top == 0) { | |
844 // We have detected a pop of an empty monitor stack. | |
845 _monitor_safe = false; | |
846 _monitor_top = bad_monitors; | |
847 | |
848 if (TraceMonitorMismatch) { | |
849 report_monitor_mismatch("monitor stack underflow"); | |
850 } | |
851 return CellTypeState::ref; // just to keep the analysis going. | |
852 } | |
853 return monitors()[--_monitor_top]; | |
854 } | |
855 | |
856 void GenerateOopMap::monitor_push(CellTypeState cts) { | |
857 assert(_monitor_top != bad_monitors, "monitor_push called on error monitor stack"); | |
858 if (_monitor_top >= _max_monitors) { | |
859 // Some monitorenter is being executed more than once. | |
860 // This means that the monitor stack cannot be simulated. | |
861 _monitor_safe = false; | |
862 _monitor_top = bad_monitors; | |
863 | |
864 if (TraceMonitorMismatch) { | |
865 report_monitor_mismatch("monitor stack overflow"); | |
866 } | |
867 return; | |
868 } | |
869 monitors()[_monitor_top++] = cts; | |
870 } | |
871 | |
872 // | |
873 // Interpretation handling methods | |
874 // | |
875 | |
876 void GenerateOopMap::do_interpretation() | |
877 { | |
878 // "i" is just for debugging, so we can detect cases where this loop is | |
879 // iterated more than once. | |
880 int i = 0; | |
881 do { | |
882 #ifndef PRODUCT | |
883 if (TraceNewOopMapGeneration) { | |
884 tty->print("\n\nIteration #%d of do_interpretation loop, method:\n", i); | |
885 method()->print_name(tty); | |
886 tty->print("\n\n"); | |
887 } | |
888 #endif | |
889 _conflict = false; | |
890 _monitor_safe = true; | |
891 // init_state is now called from init_basic_blocks. The length of a | |
892 // state vector cannot be determined until we have made a pass through | |
893 // the bytecodes counting the possible monitor entries. | |
894 if (!_got_error) init_basic_blocks(); | |
895 if (!_got_error) setup_method_entry_state(); | |
896 if (!_got_error) interp_all(); | |
897 if (!_got_error) rewrite_refval_conflicts(); | |
898 i++; | |
899 } while (_conflict && !_got_error); | |
900 } | |
901 | |
902 void GenerateOopMap::init_basic_blocks() { | |
903 // Note: Could consider reserving only the needed space for each BB's state | |
904 // (entry stack may not be of maximal height for every basic block). | |
905 // But cumbersome since we don't know the stack heights yet. (Nor the | |
906 // monitor stack heights...) | |
907 | |
908 _basic_blocks = NEW_RESOURCE_ARRAY(BasicBlock, _bb_count); | |
909 | |
910 // Make a pass through the bytecodes. Count the number of monitorenters. | |
911 // This can be used an upper bound on the monitor stack depth in programs | |
912 // which obey stack discipline with their monitor usage. Initialize the | |
913 // known information about basic blocks. | |
914 BytecodeStream j(_method); | |
915 Bytecodes::Code bytecode; | |
916 | |
917 int bbNo = 0; | |
918 int monitor_count = 0; | |
919 int prev_bci = -1; | |
920 while( (bytecode = j.next()) >= 0) { | |
921 if (j.code() == Bytecodes::_monitorenter) { | |
922 monitor_count++; | |
923 } | |
924 | |
925 int bci = j.bci(); | |
926 if (is_bb_header(bci)) { | |
927 // Initialize the basicblock structure | |
928 BasicBlock *bb = _basic_blocks + bbNo; | |
929 bb->_bci = bci; | |
930 bb->_max_locals = _max_locals; | |
931 bb->_max_stack = _max_stack; | |
932 bb->set_changed(false); | |
933 bb->_stack_top = BasicBlock::_dead_basic_block; // Initialize all basicblocks are dead. | |
934 bb->_monitor_top = bad_monitors; | |
935 | |
936 if (bbNo > 0) { | |
937 _basic_blocks[bbNo - 1]._end_bci = prev_bci; | |
938 } | |
939 | |
940 bbNo++; | |
941 } | |
942 // Remember prevous bci. | |
943 prev_bci = bci; | |
944 } | |
945 // Set | |
946 _basic_blocks[bbNo-1]._end_bci = prev_bci; | |
947 | |
948 | |
342 | 949 // Check that the correct number of basicblocks was found |
950 if (bbNo !=_bb_count) { | |
951 if (bbNo < _bb_count) { | |
952 verify_error("jump into the middle of instruction?"); | |
953 return; | |
954 } else { | |
955 verify_error("extra basic blocks - should not happen?"); | |
956 return; | |
957 } | |
958 } | |
959 | |
0 | 960 _max_monitors = monitor_count; |
961 | |
962 // Now that we have a bound on the depth of the monitor stack, we can | |
963 // initialize the CellTypeState-related information. | |
964 init_state(); | |
965 | |
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966 // We allocate space for all state-vectors for all basicblocks in one huge |
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967 // chunk. Then in the next part of the code, we set a pointer in each |
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968 // _basic_block that points to each piece. |
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969 |
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970 // The product of bbNo and _state_len can get large if there are lots of |
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971 // basic blocks and stack/locals/monitors. Need to check to make sure |
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972 // we don't overflow the capacity of a pointer. |
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973 if ((unsigned)bbNo > UINTPTR_MAX / sizeof(CellTypeState) / _state_len) { |
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974 report_error("The amount of memory required to analyze this method " |
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975 "exceeds addressable range"); |
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976 return; |
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977 } |
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978 |
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979 CellTypeState *basicBlockState = |
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980 NEW_RESOURCE_ARRAY(CellTypeState, bbNo * _state_len); |
0 | 981 memset(basicBlockState, 0, bbNo * _state_len * sizeof(CellTypeState)); |
982 | |
983 // Make a pass over the basicblocks and assign their state vectors. | |
984 for (int blockNum=0; blockNum < bbNo; blockNum++) { | |
985 BasicBlock *bb = _basic_blocks + blockNum; | |
986 bb->_state = basicBlockState + blockNum * _state_len; | |
987 | |
988 #ifdef ASSERT | |
989 if (blockNum + 1 < bbNo) { | |
990 address bcp = _method->bcp_from(bb->_end_bci); | |
2142 | 991 int bc_len = Bytecodes::java_length_at(_method(), bcp); |
0 | 992 assert(bb->_end_bci + bc_len == bb[1]._bci, "unmatched bci info in basicblock"); |
993 } | |
994 #endif | |
995 } | |
996 #ifdef ASSERT | |
997 { BasicBlock *bb = &_basic_blocks[bbNo-1]; | |
998 address bcp = _method->bcp_from(bb->_end_bci); | |
2142 | 999 int bc_len = Bytecodes::java_length_at(_method(), bcp); |
0 | 1000 assert(bb->_end_bci + bc_len == _method->code_size(), "wrong end bci"); |
1001 } | |
1002 #endif | |
1003 | |
1004 // Mark all alive blocks | |
1005 mark_reachable_code(); | |
1006 } | |
1007 | |
1008 void GenerateOopMap::setup_method_entry_state() { | |
1009 | |
1010 // Initialize all locals to 'uninit' and set stack-height to 0 | |
1011 make_context_uninitialized(); | |
1012 | |
1013 // Initialize CellState type of arguments | |
1014 methodsig_to_effect(method()->signature(), method()->is_static(), vars()); | |
1015 | |
1016 // If some references must be pre-assigned to null, then set that up | |
1017 initialize_vars(); | |
1018 | |
1019 // This is the start state | |
1020 merge_state_into_bb(&_basic_blocks[0]); | |
1021 | |
1022 assert(_basic_blocks[0].changed(), "we are not getting off the ground"); | |
1023 } | |
1024 | |
1025 // The instruction at bci is changing size by "delta". Update the basic blocks. | |
1026 void GenerateOopMap::update_basic_blocks(int bci, int delta, | |
1027 int new_method_size) { | |
1028 assert(new_method_size >= method()->code_size() + delta, | |
1029 "new method size is too small"); | |
1030 | |
342 | 1031 BitMap::bm_word_t* new_bb_hdr_bits = |
1032 NEW_RESOURCE_ARRAY(BitMap::bm_word_t, | |
1033 BitMap::word_align_up(new_method_size)); | |
1034 _bb_hdr_bits.set_map(new_bb_hdr_bits); | |
1035 _bb_hdr_bits.set_size(new_method_size); | |
1036 _bb_hdr_bits.clear(); | |
0 | 1037 |
1038 | |
1039 for(int k = 0; k < _bb_count; k++) { | |
1040 if (_basic_blocks[k]._bci > bci) { | |
1041 _basic_blocks[k]._bci += delta; | |
1042 _basic_blocks[k]._end_bci += delta; | |
1043 } | |
342 | 1044 _bb_hdr_bits.at_put(_basic_blocks[k]._bci, true); |
0 | 1045 } |
1046 } | |
1047 | |
1048 // | |
1049 // Initvars handling | |
1050 // | |
1051 | |
1052 void GenerateOopMap::initialize_vars() { | |
1053 for (int k = 0; k < _init_vars->length(); k++) | |
1054 _state[_init_vars->at(k)] = CellTypeState::make_slot_ref(k); | |
1055 } | |
1056 | |
1057 void GenerateOopMap::add_to_ref_init_set(int localNo) { | |
1058 | |
1059 if (TraceNewOopMapGeneration) | |
1060 tty->print_cr("Added init vars: %d", localNo); | |
1061 | |
1062 // Is it already in the set? | |
1063 if (_init_vars->contains(localNo) ) | |
1064 return; | |
1065 | |
1066 _init_vars->append(localNo); | |
1067 } | |
1068 | |
1069 // | |
1070 // Interpreration code | |
1071 // | |
1072 | |
1073 void GenerateOopMap::interp_all() { | |
1074 bool change = true; | |
1075 | |
1076 while (change && !_got_error) { | |
1077 change = false; | |
1078 for (int i = 0; i < _bb_count && !_got_error; i++) { | |
1079 BasicBlock *bb = &_basic_blocks[i]; | |
1080 if (bb->changed()) { | |
1081 if (_got_error) return; | |
1082 change = true; | |
1083 bb->set_changed(false); | |
1084 interp_bb(bb); | |
1085 } | |
1086 } | |
1087 } | |
1088 } | |
1089 | |
1090 void GenerateOopMap::interp_bb(BasicBlock *bb) { | |
1091 | |
1092 // We do not want to do anything in case the basic-block has not been initialized. This | |
1093 // will happen in the case where there is dead-code hang around in a method. | |
1094 assert(bb->is_reachable(), "should be reachable or deadcode exist"); | |
1095 restore_state(bb); | |
1096 | |
1097 BytecodeStream itr(_method); | |
1098 | |
1099 // Set iterator interval to be the current basicblock | |
1100 int lim_bci = next_bb_start_pc(bb); | |
1101 itr.set_interval(bb->_bci, lim_bci); | |
1102 assert(lim_bci != bb->_bci, "must be at least one instruction in a basicblock"); | |
1103 itr.next(); // read first instruction | |
1104 | |
1105 // Iterates through all bytecodes except the last in a basic block. | |
1106 // We handle the last one special, since there is controlflow change. | |
1107 while(itr.next_bci() < lim_bci && !_got_error) { | |
1108 if (_has_exceptions || _monitor_top != 0) { | |
1109 // We do not need to interpret the results of exceptional | |
1110 // continuation from this instruction when the method has no | |
1111 // exception handlers and the monitor stack is currently | |
1112 // empty. | |
1113 do_exception_edge(&itr); | |
1114 } | |
1115 interp1(&itr); | |
1116 itr.next(); | |
1117 } | |
1118 | |
1119 // Handle last instruction. | |
1120 if (!_got_error) { | |
1121 assert(itr.next_bci() == lim_bci, "must point to end"); | |
1122 if (_has_exceptions || _monitor_top != 0) { | |
1123 do_exception_edge(&itr); | |
1124 } | |
1125 interp1(&itr); | |
1126 | |
1127 bool fall_through = jump_targets_do(&itr, GenerateOopMap::merge_state, NULL); | |
1128 if (_got_error) return; | |
1129 | |
1130 if (itr.code() == Bytecodes::_ret) { | |
1131 assert(!fall_through, "cannot be set if ret instruction"); | |
1132 // Automatically handles 'wide' ret indicies | |
1133 ret_jump_targets_do(&itr, GenerateOopMap::merge_state, itr.get_index(), NULL); | |
1134 } else if (fall_through) { | |
1135 // Hit end of BB, but the instr. was a fall-through instruction, | |
1136 // so perform transition as if the BB ended in a "jump". | |
1137 if (lim_bci != bb[1]._bci) { | |
1138 verify_error("bytecodes fell through last instruction"); | |
1139 return; | |
1140 } | |
1141 merge_state_into_bb(bb + 1); | |
1142 } | |
1143 } | |
1144 } | |
1145 | |
1146 void GenerateOopMap::do_exception_edge(BytecodeStream* itr) { | |
1147 // Only check exception edge, if bytecode can trap | |
1148 if (!Bytecodes::can_trap(itr->code())) return; | |
1149 switch (itr->code()) { | |
1150 case Bytecodes::_aload_0: | |
1151 // These bytecodes can trap for rewriting. We need to assume that | |
1152 // they do not throw exceptions to make the monitor analysis work. | |
1153 return; | |
1154 | |
1155 case Bytecodes::_ireturn: | |
1156 case Bytecodes::_lreturn: | |
1157 case Bytecodes::_freturn: | |
1158 case Bytecodes::_dreturn: | |
1159 case Bytecodes::_areturn: | |
1160 case Bytecodes::_return: | |
1161 // If the monitor stack height is not zero when we leave the method, | |
1162 // then we are either exiting with a non-empty stack or we have | |
1163 // found monitor trouble earlier in our analysis. In either case, | |
1164 // assume an exception could be taken here. | |
1165 if (_monitor_top == 0) { | |
1166 return; | |
1167 } | |
1168 break; | |
1169 | |
1170 case Bytecodes::_monitorexit: | |
1171 // If the monitor stack height is bad_monitors, then we have detected a | |
1172 // monitor matching problem earlier in the analysis. If the | |
1173 // monitor stack height is 0, we are about to pop a monitor | |
1174 // off of an empty stack. In either case, the bytecode | |
1175 // could throw an exception. | |
1176 if (_monitor_top != bad_monitors && _monitor_top != 0) { | |
1177 return; | |
1178 } | |
1179 break; | |
1180 } | |
1181 | |
1182 if (_has_exceptions) { | |
1183 int bci = itr->bci(); | |
1184 typeArrayOop exct = method()->exception_table(); | |
1185 for(int i = 0; i< exct->length(); i+=4) { | |
1186 int start_pc = exct->int_at(i); | |
1187 int end_pc = exct->int_at(i+1); | |
1188 int handler_pc = exct->int_at(i+2); | |
1189 int catch_type = exct->int_at(i+3); | |
1190 | |
1191 if (start_pc <= bci && bci < end_pc) { | |
1192 BasicBlock *excBB = get_basic_block_at(handler_pc); | |
1193 CellTypeState *excStk = excBB->stack(); | |
1194 CellTypeState *cOpStck = stack(); | |
1195 CellTypeState cOpStck_0 = cOpStck[0]; | |
1196 int cOpStackTop = _stack_top; | |
1197 | |
1198 // Exception stacks are always the same. | |
1199 assert(method()->max_stack() > 0, "sanity check"); | |
1200 | |
1201 // We remembered the size and first element of "cOpStck" | |
1202 // above; now we temporarily set them to the appropriate | |
1203 // values for an exception handler. */ | |
1204 cOpStck[0] = CellTypeState::make_slot_ref(_max_locals); | |
1205 _stack_top = 1; | |
1206 | |
1207 merge_state_into_bb(excBB); | |
1208 | |
1209 // Now undo the temporary change. | |
1210 cOpStck[0] = cOpStck_0; | |
1211 _stack_top = cOpStackTop; | |
1212 | |
1213 // If this is a "catch all" handler, then we do not need to | |
1214 // consider any additional handlers. | |
1215 if (catch_type == 0) { | |
1216 return; | |
1217 } | |
1218 } | |
1219 } | |
1220 } | |
1221 | |
1222 // It is possible that none of the exception handlers would have caught | |
1223 // the exception. In this case, we will exit the method. We must | |
1224 // ensure that the monitor stack is empty in this case. | |
1225 if (_monitor_top == 0) { | |
1226 return; | |
1227 } | |
1228 | |
1229 // We pessimistically assume that this exception can escape the | |
1230 // method. (It is possible that it will always be caught, but | |
1231 // we don't care to analyse the types of the catch clauses.) | |
1232 | |
1233 // We don't set _monitor_top to bad_monitors because there are no successors | |
1234 // to this exceptional exit. | |
1235 | |
1236 if (TraceMonitorMismatch && _monitor_safe) { | |
1237 // We check _monitor_safe so that we only report the first mismatched | |
1238 // exceptional exit. | |
1239 report_monitor_mismatch("non-empty monitor stack at exceptional exit"); | |
1240 } | |
1241 _monitor_safe = false; | |
1242 | |
1243 } | |
1244 | |
1245 void GenerateOopMap::report_monitor_mismatch(const char *msg) { | |
1246 #ifndef PRODUCT | |
1247 tty->print(" Monitor mismatch in method "); | |
1248 method()->print_short_name(tty); | |
1249 tty->print_cr(": %s", msg); | |
1250 #endif | |
1251 } | |
1252 | |
1253 void GenerateOopMap::print_states(outputStream *os, | |
1254 CellTypeState* vec, int num) { | |
1255 for (int i = 0; i < num; i++) { | |
1256 vec[i].print(tty); | |
1257 } | |
1258 } | |
1259 | |
1260 // Print the state values at the current bytecode. | |
1261 void GenerateOopMap::print_current_state(outputStream *os, | |
1262 BytecodeStream *currentBC, | |
1263 bool detailed) { | |
1264 | |
1265 if (detailed) { | |
1266 os->print(" %4d vars = ", currentBC->bci()); | |
1267 print_states(os, vars(), _max_locals); | |
1268 os->print(" %s", Bytecodes::name(currentBC->code())); | |
1269 switch(currentBC->code()) { | |
1270 case Bytecodes::_invokevirtual: | |
1271 case Bytecodes::_invokespecial: | |
1272 case Bytecodes::_invokestatic: | |
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1273 case Bytecodes::_invokedynamic: |
0 | 1274 case Bytecodes::_invokeinterface: |
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1275 int idx = currentBC->has_index_u4() ? currentBC->get_index_u4() : currentBC->get_index_u2_cpcache(); |
0 | 1276 constantPoolOop cp = method()->constants(); |
1277 int nameAndTypeIdx = cp->name_and_type_ref_index_at(idx); | |
1278 int signatureIdx = cp->signature_ref_index_at(nameAndTypeIdx); | |
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1279 Symbol* signature = cp->symbol_at(signatureIdx); |
0 | 1280 os->print("%s", signature->as_C_string()); |
1281 } | |
1282 os->cr(); | |
1283 os->print(" stack = "); | |
1284 print_states(os, stack(), _stack_top); | |
1285 os->cr(); | |
1286 if (_monitor_top != bad_monitors) { | |
1287 os->print(" monitors = "); | |
1288 print_states(os, monitors(), _monitor_top); | |
1289 } else { | |
1290 os->print(" [bad monitor stack]"); | |
1291 } | |
1292 os->cr(); | |
1293 } else { | |
1294 os->print(" %4d vars = '%s' ", currentBC->bci(), state_vec_to_string(vars(), _max_locals)); | |
1295 os->print(" stack = '%s' ", state_vec_to_string(stack(), _stack_top)); | |
1296 if (_monitor_top != bad_monitors) { | |
1297 os->print(" monitors = '%s' \t%s", state_vec_to_string(monitors(), _monitor_top), Bytecodes::name(currentBC->code())); | |
1298 } else { | |
1299 os->print(" [bad monitor stack]"); | |
1300 } | |
1301 switch(currentBC->code()) { | |
1302 case Bytecodes::_invokevirtual: | |
1303 case Bytecodes::_invokespecial: | |
1304 case Bytecodes::_invokestatic: | |
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1305 case Bytecodes::_invokedynamic: |
0 | 1306 case Bytecodes::_invokeinterface: |
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1307 int idx = currentBC->has_index_u4() ? currentBC->get_index_u4() : currentBC->get_index_u2_cpcache(); |
0 | 1308 constantPoolOop cp = method()->constants(); |
1309 int nameAndTypeIdx = cp->name_and_type_ref_index_at(idx); | |
1310 int signatureIdx = cp->signature_ref_index_at(nameAndTypeIdx); | |
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1311 Symbol* signature = cp->symbol_at(signatureIdx); |
0 | 1312 os->print("%s", signature->as_C_string()); |
1313 } | |
1314 os->cr(); | |
1315 } | |
1316 } | |
1317 | |
1318 // Sets the current state to be the state after executing the | |
1319 // current instruction, starting in the current state. | |
1320 void GenerateOopMap::interp1(BytecodeStream *itr) { | |
1321 if (TraceNewOopMapGeneration) { | |
1322 print_current_state(tty, itr, TraceNewOopMapGenerationDetailed); | |
1323 } | |
1324 | |
1325 // Should we report the results? Result is reported *before* the instruction at the current bci is executed. | |
1326 // However, not for calls. For calls we do not want to include the arguments, so we postpone the reporting until | |
1327 // they have been popped (in method ppl). | |
1328 if (_report_result == true) { | |
1329 switch(itr->code()) { | |
1330 case Bytecodes::_invokevirtual: | |
1331 case Bytecodes::_invokespecial: | |
1332 case Bytecodes::_invokestatic: | |
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1333 case Bytecodes::_invokedynamic: |
0 | 1334 case Bytecodes::_invokeinterface: |
1335 _itr_send = itr; | |
1336 _report_result_for_send = true; | |
1337 break; | |
1338 default: | |
1339 fill_stackmap_for_opcodes(itr, vars(), stack(), _stack_top); | |
1340 break; | |
1341 } | |
1342 } | |
1343 | |
1344 // abstract interpretation of current opcode | |
1345 switch(itr->code()) { | |
1346 case Bytecodes::_nop: break; | |
1347 case Bytecodes::_goto: break; | |
1348 case Bytecodes::_goto_w: break; | |
1349 case Bytecodes::_iinc: break; | |
1350 case Bytecodes::_return: do_return_monitor_check(); | |
1351 break; | |
1352 | |
1353 case Bytecodes::_aconst_null: | |
1354 case Bytecodes::_new: ppush1(CellTypeState::make_line_ref(itr->bci())); | |
1355 break; | |
1356 | |
1357 case Bytecodes::_iconst_m1: | |
1358 case Bytecodes::_iconst_0: | |
1359 case Bytecodes::_iconst_1: | |
1360 case Bytecodes::_iconst_2: | |
1361 case Bytecodes::_iconst_3: | |
1362 case Bytecodes::_iconst_4: | |
1363 case Bytecodes::_iconst_5: | |
1364 case Bytecodes::_fconst_0: | |
1365 case Bytecodes::_fconst_1: | |
1366 case Bytecodes::_fconst_2: | |
1367 case Bytecodes::_bipush: | |
1368 case Bytecodes::_sipush: ppush1(valCTS); break; | |
1369 | |
1370 case Bytecodes::_lconst_0: | |
1371 case Bytecodes::_lconst_1: | |
1372 case Bytecodes::_dconst_0: | |
1373 case Bytecodes::_dconst_1: ppush(vvCTS); break; | |
1374 | |
1375 case Bytecodes::_ldc2_w: ppush(vvCTS); break; | |
1376 | |
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1377 case Bytecodes::_ldc: // fall through: |
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1378 case Bytecodes::_ldc_w: do_ldc(itr->bci()); break; |
0 | 1379 |
1380 case Bytecodes::_iload: | |
1381 case Bytecodes::_fload: ppload(vCTS, itr->get_index()); break; | |
1382 | |
1383 case Bytecodes::_lload: | |
1384 case Bytecodes::_dload: ppload(vvCTS,itr->get_index()); break; | |
1385 | |
1386 case Bytecodes::_aload: ppload(rCTS, itr->get_index()); break; | |
1387 | |
1388 case Bytecodes::_iload_0: | |
1389 case Bytecodes::_fload_0: ppload(vCTS, 0); break; | |
1390 case Bytecodes::_iload_1: | |
1391 case Bytecodes::_fload_1: ppload(vCTS, 1); break; | |
1392 case Bytecodes::_iload_2: | |
1393 case Bytecodes::_fload_2: ppload(vCTS, 2); break; | |
1394 case Bytecodes::_iload_3: | |
1395 case Bytecodes::_fload_3: ppload(vCTS, 3); break; | |
1396 | |
1397 case Bytecodes::_lload_0: | |
1398 case Bytecodes::_dload_0: ppload(vvCTS, 0); break; | |
1399 case Bytecodes::_lload_1: | |
1400 case Bytecodes::_dload_1: ppload(vvCTS, 1); break; | |
1401 case Bytecodes::_lload_2: | |
1402 case Bytecodes::_dload_2: ppload(vvCTS, 2); break; | |
1403 case Bytecodes::_lload_3: | |
1404 case Bytecodes::_dload_3: ppload(vvCTS, 3); break; | |
1405 | |
1406 case Bytecodes::_aload_0: ppload(rCTS, 0); break; | |
1407 case Bytecodes::_aload_1: ppload(rCTS, 1); break; | |
1408 case Bytecodes::_aload_2: ppload(rCTS, 2); break; | |
1409 case Bytecodes::_aload_3: ppload(rCTS, 3); break; | |
1410 | |
1411 case Bytecodes::_iaload: | |
1412 case Bytecodes::_faload: | |
1413 case Bytecodes::_baload: | |
1414 case Bytecodes::_caload: | |
1415 case Bytecodes::_saload: pp(vrCTS, vCTS); break; | |
1416 | |
1417 case Bytecodes::_laload: pp(vrCTS, vvCTS); break; | |
1418 case Bytecodes::_daload: pp(vrCTS, vvCTS); break; | |
1419 | |
1420 case Bytecodes::_aaload: pp_new_ref(vrCTS, itr->bci()); break; | |
1421 | |
1422 case Bytecodes::_istore: | |
1423 case Bytecodes::_fstore: ppstore(vCTS, itr->get_index()); break; | |
1424 | |
1425 case Bytecodes::_lstore: | |
1426 case Bytecodes::_dstore: ppstore(vvCTS, itr->get_index()); break; | |
1427 | |
1428 case Bytecodes::_astore: do_astore(itr->get_index()); break; | |
1429 | |
1430 case Bytecodes::_istore_0: | |
1431 case Bytecodes::_fstore_0: ppstore(vCTS, 0); break; | |
1432 case Bytecodes::_istore_1: | |
1433 case Bytecodes::_fstore_1: ppstore(vCTS, 1); break; | |
1434 case Bytecodes::_istore_2: | |
1435 case Bytecodes::_fstore_2: ppstore(vCTS, 2); break; | |
1436 case Bytecodes::_istore_3: | |
1437 case Bytecodes::_fstore_3: ppstore(vCTS, 3); break; | |
1438 | |
1439 case Bytecodes::_lstore_0: | |
1440 case Bytecodes::_dstore_0: ppstore(vvCTS, 0); break; | |
1441 case Bytecodes::_lstore_1: | |
1442 case Bytecodes::_dstore_1: ppstore(vvCTS, 1); break; | |
1443 case Bytecodes::_lstore_2: | |
1444 case Bytecodes::_dstore_2: ppstore(vvCTS, 2); break; | |
1445 case Bytecodes::_lstore_3: | |
1446 case Bytecodes::_dstore_3: ppstore(vvCTS, 3); break; | |
1447 | |
1448 case Bytecodes::_astore_0: do_astore(0); break; | |
1449 case Bytecodes::_astore_1: do_astore(1); break; | |
1450 case Bytecodes::_astore_2: do_astore(2); break; | |
1451 case Bytecodes::_astore_3: do_astore(3); break; | |
1452 | |
1453 case Bytecodes::_iastore: | |
1454 case Bytecodes::_fastore: | |
1455 case Bytecodes::_bastore: | |
1456 case Bytecodes::_castore: | |
1457 case Bytecodes::_sastore: ppop(vvrCTS); break; | |
1458 case Bytecodes::_lastore: | |
1459 case Bytecodes::_dastore: ppop(vvvrCTS); break; | |
1460 case Bytecodes::_aastore: ppop(rvrCTS); break; | |
1461 | |
1462 case Bytecodes::_pop: ppop_any(1); break; | |
1463 case Bytecodes::_pop2: ppop_any(2); break; | |
1464 | |
1465 case Bytecodes::_dup: ppdupswap(1, "11"); break; | |
1466 case Bytecodes::_dup_x1: ppdupswap(2, "121"); break; | |
1467 case Bytecodes::_dup_x2: ppdupswap(3, "1321"); break; | |
1468 case Bytecodes::_dup2: ppdupswap(2, "2121"); break; | |
1469 case Bytecodes::_dup2_x1: ppdupswap(3, "21321"); break; | |
1470 case Bytecodes::_dup2_x2: ppdupswap(4, "214321"); break; | |
1471 case Bytecodes::_swap: ppdupswap(2, "12"); break; | |
1472 | |
1473 case Bytecodes::_iadd: | |
1474 case Bytecodes::_fadd: | |
1475 case Bytecodes::_isub: | |
1476 case Bytecodes::_fsub: | |
1477 case Bytecodes::_imul: | |
1478 case Bytecodes::_fmul: | |
1479 case Bytecodes::_idiv: | |
1480 case Bytecodes::_fdiv: | |
1481 case Bytecodes::_irem: | |
1482 case Bytecodes::_frem: | |
1483 case Bytecodes::_ishl: | |
1484 case Bytecodes::_ishr: | |
1485 case Bytecodes::_iushr: | |
1486 case Bytecodes::_iand: | |
1487 case Bytecodes::_ior: | |
1488 case Bytecodes::_ixor: | |
1489 case Bytecodes::_l2f: | |
1490 case Bytecodes::_l2i: | |
1491 case Bytecodes::_d2f: | |
1492 case Bytecodes::_d2i: | |
1493 case Bytecodes::_fcmpl: | |
1494 case Bytecodes::_fcmpg: pp(vvCTS, vCTS); break; | |
1495 | |
1496 case Bytecodes::_ladd: | |
1497 case Bytecodes::_dadd: | |
1498 case Bytecodes::_lsub: | |
1499 case Bytecodes::_dsub: | |
1500 case Bytecodes::_lmul: | |
1501 case Bytecodes::_dmul: | |
1502 case Bytecodes::_ldiv: | |
1503 case Bytecodes::_ddiv: | |
1504 case Bytecodes::_lrem: | |
1505 case Bytecodes::_drem: | |
1506 case Bytecodes::_land: | |
1507 case Bytecodes::_lor: | |
1508 case Bytecodes::_lxor: pp(vvvvCTS, vvCTS); break; | |
1509 | |
1510 case Bytecodes::_ineg: | |
1511 case Bytecodes::_fneg: | |
1512 case Bytecodes::_i2f: | |
1513 case Bytecodes::_f2i: | |
1514 case Bytecodes::_i2c: | |
1515 case Bytecodes::_i2s: | |
1516 case Bytecodes::_i2b: pp(vCTS, vCTS); break; | |
1517 | |
1518 case Bytecodes::_lneg: | |
1519 case Bytecodes::_dneg: | |
1520 case Bytecodes::_l2d: | |
1521 case Bytecodes::_d2l: pp(vvCTS, vvCTS); break; | |
1522 | |
1523 case Bytecodes::_lshl: | |
1524 case Bytecodes::_lshr: | |
1525 case Bytecodes::_lushr: pp(vvvCTS, vvCTS); break; | |
1526 | |
1527 case Bytecodes::_i2l: | |
1528 case Bytecodes::_i2d: | |
1529 case Bytecodes::_f2l: | |
1530 case Bytecodes::_f2d: pp(vCTS, vvCTS); break; | |
1531 | |
1532 case Bytecodes::_lcmp: pp(vvvvCTS, vCTS); break; | |
1533 case Bytecodes::_dcmpl: | |
1534 case Bytecodes::_dcmpg: pp(vvvvCTS, vCTS); break; | |
1535 | |
1536 case Bytecodes::_ifeq: | |
1537 case Bytecodes::_ifne: | |
1538 case Bytecodes::_iflt: | |
1539 case Bytecodes::_ifge: | |
1540 case Bytecodes::_ifgt: | |
1541 case Bytecodes::_ifle: | |
1542 case Bytecodes::_tableswitch: ppop1(valCTS); | |
1543 break; | |
1544 case Bytecodes::_ireturn: | |
1545 case Bytecodes::_freturn: do_return_monitor_check(); | |
1546 ppop1(valCTS); | |
1547 break; | |
1548 case Bytecodes::_if_icmpeq: | |
1549 case Bytecodes::_if_icmpne: | |
1550 case Bytecodes::_if_icmplt: | |
1551 case Bytecodes::_if_icmpge: | |
1552 case Bytecodes::_if_icmpgt: | |
1553 case Bytecodes::_if_icmple: ppop(vvCTS); | |
1554 break; | |
1555 | |
1556 case Bytecodes::_lreturn: do_return_monitor_check(); | |
1557 ppop(vvCTS); | |
1558 break; | |
1559 | |
1560 case Bytecodes::_dreturn: do_return_monitor_check(); | |
1561 ppop(vvCTS); | |
1562 break; | |
1563 | |
1564 case Bytecodes::_if_acmpeq: | |
1565 case Bytecodes::_if_acmpne: ppop(rrCTS); break; | |
1566 | |
1567 case Bytecodes::_jsr: do_jsr(itr->dest()); break; | |
1568 case Bytecodes::_jsr_w: do_jsr(itr->dest_w()); break; | |
1569 | |
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1570 case Bytecodes::_getstatic: do_field(true, true, itr->get_index_u2_cpcache(), itr->bci()); break; |
1565 | 1571 case Bytecodes::_putstatic: do_field(false, true, itr->get_index_u2_cpcache(), itr->bci()); break; |
1572 case Bytecodes::_getfield: do_field(true, false, itr->get_index_u2_cpcache(), itr->bci()); break; | |
1573 case Bytecodes::_putfield: do_field(false, false, itr->get_index_u2_cpcache(), itr->bci()); break; | |
0 | 1574 |
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1575 case Bytecodes::_invokevirtual: |
1565 | 1576 case Bytecodes::_invokespecial: do_method(false, false, itr->get_index_u2_cpcache(), itr->bci()); break; |
1577 case Bytecodes::_invokestatic: do_method(true, false, itr->get_index_u2_cpcache(), itr->bci()); break; | |
1578 case Bytecodes::_invokedynamic: do_method(true, false, itr->get_index_u4(), itr->bci()); break; | |
1579 case Bytecodes::_invokeinterface: do_method(false, true, itr->get_index_u2_cpcache(), itr->bci()); break; | |
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1580 case Bytecodes::_newarray: |
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1581 case Bytecodes::_anewarray: pp_new_ref(vCTS, itr->bci()); break; |
0 | 1582 case Bytecodes::_checkcast: do_checkcast(); break; |
1583 case Bytecodes::_arraylength: | |
1584 case Bytecodes::_instanceof: pp(rCTS, vCTS); break; | |
1585 case Bytecodes::_monitorenter: do_monitorenter(itr->bci()); break; | |
1586 case Bytecodes::_monitorexit: do_monitorexit(itr->bci()); break; | |
1587 | |
1588 case Bytecodes::_athrow: // handled by do_exception_edge() BUT ... | |
1589 // vlh(apple): do_exception_edge() does not get | |
1590 // called if method has no exception handlers | |
1591 if ((!_has_exceptions) && (_monitor_top > 0)) { | |
1592 _monitor_safe = false; | |
1593 } | |
1594 break; | |
1595 | |
1596 case Bytecodes::_areturn: do_return_monitor_check(); | |
1597 ppop1(refCTS); | |
1598 break; | |
1599 case Bytecodes::_ifnull: | |
1600 case Bytecodes::_ifnonnull: ppop1(refCTS); break; | |
1601 case Bytecodes::_multianewarray: do_multianewarray(*(itr->bcp()+3), itr->bci()); break; | |
1602 | |
1603 case Bytecodes::_wide: fatal("Iterator should skip this bytecode"); break; | |
1604 case Bytecodes::_ret: break; | |
1605 | |
1606 // Java opcodes | |
1607 case Bytecodes::_lookupswitch: ppop1(valCTS); break; | |
1608 | |
1609 default: | |
1610 tty->print("unexpected opcode: %d\n", itr->code()); | |
1611 ShouldNotReachHere(); | |
1612 break; | |
1613 } | |
1614 } | |
1615 | |
1616 void GenerateOopMap::check_type(CellTypeState expected, CellTypeState actual) { | |
1617 if (!expected.equal_kind(actual)) { | |
1618 verify_error("wrong type on stack (found: %c expected: %c)", actual.to_char(), expected.to_char()); | |
1619 } | |
1620 } | |
1621 | |
1622 void GenerateOopMap::ppstore(CellTypeState *in, int loc_no) { | |
1623 while(!(*in).is_bottom()) { | |
1624 CellTypeState expected =*in++; | |
1625 CellTypeState actual = pop(); | |
1626 check_type(expected, actual); | |
1627 assert(loc_no >= 0, "sanity check"); | |
1628 set_var(loc_no++, actual); | |
1629 } | |
1630 } | |
1631 | |
1632 void GenerateOopMap::ppload(CellTypeState *out, int loc_no) { | |
1633 while(!(*out).is_bottom()) { | |
1634 CellTypeState out1 = *out++; | |
1635 CellTypeState vcts = get_var(loc_no); | |
1636 assert(out1.can_be_reference() || out1.can_be_value(), | |
1637 "can only load refs. and values."); | |
1638 if (out1.is_reference()) { | |
1639 assert(loc_no>=0, "sanity check"); | |
1640 if (!vcts.is_reference()) { | |
1641 // We were asked to push a reference, but the type of the | |
1642 // variable can be something else | |
1643 _conflict = true; | |
1644 if (vcts.can_be_uninit()) { | |
1645 // It is a ref-uninit conflict (at least). If there are other | |
1646 // problems, we'll get them in the next round | |
1647 add_to_ref_init_set(loc_no); | |
1648 vcts = out1; | |
1649 } else { | |
1650 // It wasn't a ref-uninit conflict. So must be a | |
1651 // ref-val or ref-pc conflict. Split the variable. | |
1652 record_refval_conflict(loc_no); | |
1653 vcts = out1; | |
1654 } | |
1655 push(out1); // recover... | |
1656 } else { | |
1657 push(vcts); // preserve reference. | |
1658 } | |
1659 // Otherwise it is a conflict, but one that verification would | |
1660 // have caught if illegal. In particular, it can't be a topCTS | |
1661 // resulting from mergeing two difference pcCTS's since the verifier | |
1662 // would have rejected any use of such a merge. | |
1663 } else { | |
1664 push(out1); // handle val/init conflict | |
1665 } | |
1666 loc_no++; | |
1667 } | |
1668 } | |
1669 | |
1670 void GenerateOopMap::ppdupswap(int poplen, const char *out) { | |
1671 CellTypeState actual[5]; | |
1672 assert(poplen < 5, "this must be less than length of actual vector"); | |
1673 | |
1674 // pop all arguments | |
1675 for(int i = 0; i < poplen; i++) actual[i] = pop(); | |
1676 | |
1677 // put them back | |
1678 char push_ch = *out++; | |
1679 while (push_ch != '\0') { | |
1680 int idx = push_ch - '1'; | |
1681 assert(idx >= 0 && idx < poplen, "wrong arguments"); | |
1682 push(actual[idx]); | |
1683 push_ch = *out++; | |
1684 } | |
1685 } | |
1686 | |
1687 void GenerateOopMap::ppop1(CellTypeState out) { | |
1688 CellTypeState actual = pop(); | |
1689 check_type(out, actual); | |
1690 } | |
1691 | |
1692 void GenerateOopMap::ppop(CellTypeState *out) { | |
1693 while (!(*out).is_bottom()) { | |
1694 ppop1(*out++); | |
1695 } | |
1696 } | |
1697 | |
1698 void GenerateOopMap::ppush1(CellTypeState in) { | |
1699 assert(in.is_reference() | in.is_value(), "sanity check"); | |
1700 push(in); | |
1701 } | |
1702 | |
1703 void GenerateOopMap::ppush(CellTypeState *in) { | |
1704 while (!(*in).is_bottom()) { | |
1705 ppush1(*in++); | |
1706 } | |
1707 } | |
1708 | |
1709 void GenerateOopMap::pp(CellTypeState *in, CellTypeState *out) { | |
1710 ppop(in); | |
1711 ppush(out); | |
1712 } | |
1713 | |
1714 void GenerateOopMap::pp_new_ref(CellTypeState *in, int bci) { | |
1715 ppop(in); | |
1716 ppush1(CellTypeState::make_line_ref(bci)); | |
1717 } | |
1718 | |
1719 void GenerateOopMap::ppop_any(int poplen) { | |
1720 if (_stack_top >= poplen) { | |
1721 _stack_top -= poplen; | |
1722 } else { | |
1723 verify_error("stack underflow"); | |
1724 } | |
1725 } | |
1726 | |
1727 // Replace all occurences of the state 'match' with the state 'replace' | |
1728 // in our current state vector. | |
1729 void GenerateOopMap::replace_all_CTS_matches(CellTypeState match, | |
1730 CellTypeState replace) { | |
1731 int i; | |
1732 int len = _max_locals + _stack_top; | |
1733 bool change = false; | |
1734 | |
1735 for (i = len - 1; i >= 0; i--) { | |
1736 if (match.equal(_state[i])) { | |
1737 _state[i] = replace; | |
1738 } | |
1739 } | |
1740 | |
1741 if (_monitor_top > 0) { | |
1742 int base = _max_locals + _max_stack; | |
1743 len = base + _monitor_top; | |
1744 for (i = len - 1; i >= base; i--) { | |
1745 if (match.equal(_state[i])) { | |
1746 _state[i] = replace; | |
1747 } | |
1748 } | |
1749 } | |
1750 } | |
1751 | |
1752 void GenerateOopMap::do_checkcast() { | |
1753 CellTypeState actual = pop(); | |
1754 check_type(refCTS, actual); | |
1755 push(actual); | |
1756 } | |
1757 | |
1758 void GenerateOopMap::do_monitorenter(int bci) { | |
1759 CellTypeState actual = pop(); | |
1760 if (_monitor_top == bad_monitors) { | |
1761 return; | |
1762 } | |
1763 | |
1764 // Bail out when we get repeated locks on an identical monitor. This case | |
1765 // isn't too hard to handle and can be made to work if supporting nested | |
1766 // redundant synchronized statements becomes a priority. | |
1767 // | |
1768 // See also "Note" in do_monitorexit(), below. | |
1769 if (actual.is_lock_reference()) { | |
1770 _monitor_top = bad_monitors; | |
1771 _monitor_safe = false; | |
1772 | |
1773 if (TraceMonitorMismatch) { | |
1774 report_monitor_mismatch("nested redundant lock -- bailout..."); | |
1775 } | |
1776 return; | |
1777 } | |
1778 | |
1779 CellTypeState lock = CellTypeState::make_lock_ref(bci); | |
1780 check_type(refCTS, actual); | |
1781 if (!actual.is_info_top()) { | |
1782 replace_all_CTS_matches(actual, lock); | |
1783 monitor_push(lock); | |
1784 } | |
1785 } | |
1786 | |
1787 void GenerateOopMap::do_monitorexit(int bci) { | |
1788 CellTypeState actual = pop(); | |
1789 if (_monitor_top == bad_monitors) { | |
1790 return; | |
1791 } | |
1792 check_type(refCTS, actual); | |
1793 CellTypeState expected = monitor_pop(); | |
1794 if (!actual.is_lock_reference() || !expected.equal(actual)) { | |
1795 // The monitor we are exiting is not verifiably the one | |
1796 // on the top of our monitor stack. This causes a monitor | |
1797 // mismatch. | |
1798 _monitor_top = bad_monitors; | |
1799 _monitor_safe = false; | |
1800 | |
1801 // We need to mark this basic block as changed so that | |
1802 // this monitorexit will be visited again. We need to | |
1803 // do this to ensure that we have accounted for the | |
1804 // possibility that this bytecode will throw an | |
1805 // exception. | |
1806 BasicBlock* bb = get_basic_block_containing(bci); | |
1807 bb->set_changed(true); | |
1808 bb->_monitor_top = bad_monitors; | |
1809 | |
1810 if (TraceMonitorMismatch) { | |
1811 report_monitor_mismatch("improper monitor pair"); | |
1812 } | |
1813 } else { | |
1814 // This code is a fix for the case where we have repeated | |
1815 // locking of the same object in straightline code. We clear | |
1816 // out the lock when it is popped from the monitor stack | |
1817 // and replace it with an unobtrusive reference value that can | |
1818 // be locked again. | |
1819 // | |
1820 // Note: when generateOopMap is fixed to properly handle repeated, | |
1821 // nested, redundant locks on the same object, then this | |
1822 // fix will need to be removed at that time. | |
1823 replace_all_CTS_matches(actual, CellTypeState::make_line_ref(bci)); | |
1824 } | |
1825 } | |
1826 | |
1827 void GenerateOopMap::do_return_monitor_check() { | |
1828 if (_monitor_top > 0) { | |
1829 // The monitor stack must be empty when we leave the method | |
1830 // for the monitors to be properly matched. | |
1831 _monitor_safe = false; | |
1832 | |
1833 // Since there are no successors to the *return bytecode, it | |
1834 // isn't necessary to set _monitor_top to bad_monitors. | |
1835 | |
1836 if (TraceMonitorMismatch) { | |
1837 report_monitor_mismatch("non-empty monitor stack at return"); | |
1838 } | |
1839 } | |
1840 } | |
1841 | |
1842 void GenerateOopMap::do_jsr(int targ_bci) { | |
1843 push(CellTypeState::make_addr(targ_bci)); | |
1844 } | |
1845 | |
1846 | |
1847 | |
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1848 void GenerateOopMap::do_ldc(int bci) { |
2142 | 1849 Bytecode_loadconstant ldc(method(), bci); |
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1850 constantPoolOop cp = method()->constants(); |
2142 | 1851 BasicType bt = ldc.result_type(); |
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1852 CellTypeState cts = (bt == T_OBJECT) ? CellTypeState::make_line_ref(bci) : valCTS; |
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1853 // Make sure bt==T_OBJECT is the same as old code (is_pointer_entry). |
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1854 // Note that CONSTANT_MethodHandle entries are u2 index pairs, not pointer-entries, |
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1855 // and they are processed by _fast_aldc and the CP cache. |
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1856 assert((ldc.has_cache_index() || cp->is_object_entry(ldc.pool_index())) |
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1857 ? (bt == T_OBJECT) : true, "expected object type"); |
0 | 1858 ppush1(cts); |
1859 } | |
1860 | |
1861 void GenerateOopMap::do_multianewarray(int dims, int bci) { | |
1862 assert(dims >= 1, "sanity check"); | |
1863 for(int i = dims -1; i >=0; i--) { | |
1864 ppop1(valCTS); | |
1865 } | |
1866 ppush1(CellTypeState::make_line_ref(bci)); | |
1867 } | |
1868 | |
1869 void GenerateOopMap::do_astore(int idx) { | |
1870 CellTypeState r_or_p = pop(); | |
1871 if (!r_or_p.is_address() && !r_or_p.is_reference()) { | |
1872 // We actually expected ref or pc, but we only report that we expected a ref. It does not | |
1873 // really matter (at least for now) | |
1874 verify_error("wrong type on stack (found: %c, expected: {pr})", r_or_p.to_char()); | |
1875 return; | |
1876 } | |
1877 set_var(idx, r_or_p); | |
1878 } | |
1879 | |
1880 // Copies bottom/zero terminated CTS string from "src" into "dst". | |
1881 // Does NOT terminate with a bottom. Returns the number of cells copied. | |
1882 int GenerateOopMap::copy_cts(CellTypeState *dst, CellTypeState *src) { | |
1883 int idx = 0; | |
1884 while (!src[idx].is_bottom()) { | |
1885 dst[idx] = src[idx]; | |
1886 idx++; | |
1887 } | |
1888 return idx; | |
1889 } | |
1890 | |
1891 void GenerateOopMap::do_field(int is_get, int is_static, int idx, int bci) { | |
1892 // Dig up signature for field in constant pool | |
1893 constantPoolOop cp = method()->constants(); | |
1894 int nameAndTypeIdx = cp->name_and_type_ref_index_at(idx); | |
1895 int signatureIdx = cp->signature_ref_index_at(nameAndTypeIdx); | |
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1896 Symbol* signature = cp->symbol_at(signatureIdx); |
0 | 1897 |
1898 // Parse signature (espcially simple for fields) | |
1899 assert(signature->utf8_length() > 0, "field signatures cannot have zero length"); | |
1900 // The signature is UFT8 encoded, but the first char is always ASCII for signatures. | |
1901 char sigch = (char)*(signature->base()); | |
1902 CellTypeState temp[4]; | |
1903 CellTypeState *eff = sigchar_to_effect(sigch, bci, temp); | |
1904 | |
1905 CellTypeState in[4]; | |
1906 CellTypeState *out; | |
1907 int i = 0; | |
1908 | |
1909 if (is_get) { | |
1910 out = eff; | |
1911 } else { | |
1912 out = epsilonCTS; | |
1913 i = copy_cts(in, eff); | |
1914 } | |
1915 if (!is_static) in[i++] = CellTypeState::ref; | |
1916 in[i] = CellTypeState::bottom; | |
1917 assert(i<=3, "sanity check"); | |
1918 pp(in, out); | |
1919 } | |
1920 | |
1921 void GenerateOopMap::do_method(int is_static, int is_interface, int idx, int bci) { | |
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1922 // Dig up signature for field in constant pool |
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1923 constantPoolOop cp = _method->constants(); |
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1924 Symbol* signature = cp->signature_ref_at(idx); |
0 | 1925 |
1926 // Parse method signature | |
1927 CellTypeState out[4]; | |
1928 CellTypeState in[MAXARGSIZE+1]; // Includes result | |
1929 ComputeCallStack cse(signature); | |
1930 | |
1931 // Compute return type | |
1932 int res_length= cse.compute_for_returntype(out); | |
1933 | |
1934 // Temporary hack. | |
1935 if (out[0].equal(CellTypeState::ref) && out[1].equal(CellTypeState::bottom)) { | |
1936 out[0] = CellTypeState::make_line_ref(bci); | |
1937 } | |
1938 | |
1939 assert(res_length<=4, "max value should be vv"); | |
1940 | |
1941 // Compute arguments | |
1942 int arg_length = cse.compute_for_parameters(is_static != 0, in); | |
1943 assert(arg_length<=MAXARGSIZE, "too many locals"); | |
1944 | |
1945 // Pop arguments | |
1946 for (int i = arg_length - 1; i >= 0; i--) ppop1(in[i]);// Do args in reverse order. | |
1947 | |
1948 // Report results | |
1949 if (_report_result_for_send == true) { | |
1950 fill_stackmap_for_opcodes(_itr_send, vars(), stack(), _stack_top); | |
1951 _report_result_for_send = false; | |
1952 } | |
1953 | |
1954 // Push return address | |
1955 ppush(out); | |
1956 } | |
1957 | |
1958 // This is used to parse the signature for fields, since they are very simple... | |
1959 CellTypeState *GenerateOopMap::sigchar_to_effect(char sigch, int bci, CellTypeState *out) { | |
1960 // Object and array | |
1961 if (sigch=='L' || sigch=='[') { | |
1962 out[0] = CellTypeState::make_line_ref(bci); | |
1963 out[1] = CellTypeState::bottom; | |
1964 return out; | |
1965 } | |
1966 if (sigch == 'J' || sigch == 'D' ) return vvCTS; // Long and Double | |
1967 if (sigch == 'V' ) return epsilonCTS; // Void | |
1968 return vCTS; // Otherwise | |
1969 } | |
1970 | |
1971 long GenerateOopMap::_total_byte_count = 0; | |
1972 elapsedTimer GenerateOopMap::_total_oopmap_time; | |
1973 | |
1974 // This function assumes "bcs" is at a "ret" instruction and that the vars | |
1975 // state is valid for that instruction. Furthermore, the ret instruction | |
1976 // must be the last instruction in "bb" (we store information about the | |
1977 // "ret" in "bb"). | |
1978 void GenerateOopMap::ret_jump_targets_do(BytecodeStream *bcs, jmpFct_t jmpFct, int varNo, int *data) { | |
1979 CellTypeState ra = vars()[varNo]; | |
1980 if (!ra.is_good_address()) { | |
1981 verify_error("ret returns from two jsr subroutines?"); | |
1982 return; | |
1983 } | |
1984 int target = ra.get_info(); | |
1985 | |
1986 RetTableEntry* rtEnt = _rt.find_jsrs_for_target(target); | |
1987 int bci = bcs->bci(); | |
1988 for (int i = 0; i < rtEnt->nof_jsrs(); i++) { | |
1989 int target_bci = rtEnt->jsrs(i); | |
1990 // Make sure a jrtRet does not set the changed bit for dead basicblock. | |
1991 BasicBlock* jsr_bb = get_basic_block_containing(target_bci - 1); | |
1992 debug_only(BasicBlock* target_bb = &jsr_bb[1];) | |
1993 assert(target_bb == get_basic_block_at(target_bci), "wrong calc. of successor basicblock"); | |
1994 bool alive = jsr_bb->is_alive(); | |
1995 if (TraceNewOopMapGeneration) { | |
1996 tty->print("pc = %d, ret -> %d alive: %s\n", bci, target_bci, alive ? "true" : "false"); | |
1997 } | |
1998 if (alive) jmpFct(this, target_bci, data); | |
1999 } | |
2000 } | |
2001 | |
2002 // | |
2003 // Debug method | |
2004 // | |
2005 char* GenerateOopMap::state_vec_to_string(CellTypeState* vec, int len) { | |
2006 #ifdef ASSERT | |
2007 int checklen = MAX3(_max_locals, _max_stack, _max_monitors) + 1; | |
2008 assert(len < checklen, "state_vec_buf overflow"); | |
2009 #endif | |
2010 for (int i = 0; i < len; i++) _state_vec_buf[i] = vec[i].to_char(); | |
2011 _state_vec_buf[len] = 0; | |
2012 return _state_vec_buf; | |
2013 } | |
2014 | |
2015 void GenerateOopMap::print_time() { | |
2016 tty->print_cr ("Accumulated oopmap times:"); | |
2017 tty->print_cr ("---------------------------"); | |
2018 tty->print_cr (" Total : %3.3f sec.", GenerateOopMap::_total_oopmap_time.seconds()); | |
2019 tty->print_cr (" (%3.0f bytecodes per sec) ", | |
2020 GenerateOopMap::_total_byte_count / GenerateOopMap::_total_oopmap_time.seconds()); | |
2021 } | |
2022 | |
2023 // | |
2024 // ============ Main Entry Point =========== | |
2025 // | |
2026 GenerateOopMap::GenerateOopMap(methodHandle method) { | |
605 | 2027 // We have to initialize all variables here, that can be queried directly |
0 | 2028 _method = method; |
2029 _max_locals=0; | |
2030 _init_vars = NULL; | |
2031 | |
2032 #ifndef PRODUCT | |
2033 // If we are doing a detailed trace, include the regular trace information. | |
2034 if (TraceNewOopMapGenerationDetailed) { | |
2035 TraceNewOopMapGeneration = true; | |
2036 } | |
2037 #endif | |
2038 } | |
2039 | |
2040 void GenerateOopMap::compute_map(TRAPS) { | |
2041 #ifndef PRODUCT | |
2042 if (TimeOopMap2) { | |
2043 method()->print_short_name(tty); | |
2044 tty->print(" "); | |
2045 } | |
2046 if (TimeOopMap) { | |
2047 _total_byte_count += method()->code_size(); | |
2048 } | |
2049 #endif | |
2050 TraceTime t_single("oopmap time", TimeOopMap2); | |
2051 TraceTime t_all(NULL, &_total_oopmap_time, TimeOopMap); | |
2052 | |
2053 // Initialize values | |
2054 _got_error = false; | |
2055 _conflict = false; | |
2056 _max_locals = method()->max_locals(); | |
2057 _max_stack = method()->max_stack(); | |
2058 _has_exceptions = (method()->exception_table()->length() > 0); | |
2059 _nof_refval_conflicts = 0; | |
2060 _init_vars = new GrowableArray<intptr_t>(5); // There are seldom more than 5 init_vars | |
2061 _report_result = false; | |
2062 _report_result_for_send = false; | |
2063 _new_var_map = NULL; | |
2064 _ret_adr_tos = new GrowableArray<intptr_t>(5); // 5 seems like a good number; | |
2065 _did_rewriting = false; | |
2066 _did_relocation = false; | |
2067 | |
2068 if (TraceNewOopMapGeneration) { | |
2069 tty->print("Method name: %s\n", method()->name()->as_C_string()); | |
2070 if (Verbose) { | |
2071 _method->print_codes(); | |
2072 tty->print_cr("Exception table:"); | |
2073 typeArrayOop excps = method()->exception_table(); | |
2074 for(int i = 0; i < excps->length(); i += 4) { | |
2075 tty->print_cr("[%d - %d] -> %d", excps->int_at(i + 0), excps->int_at(i + 1), excps->int_at(i + 2)); | |
2076 } | |
2077 } | |
2078 } | |
2079 | |
2080 // if no code - do nothing | |
2081 // compiler needs info | |
2082 if (method()->code_size() == 0 || _max_locals + method()->max_stack() == 0) { | |
2083 fill_stackmap_prolog(0); | |
2084 fill_stackmap_epilog(); | |
2085 return; | |
2086 } | |
2087 // Step 1: Compute all jump targets and their return value | |
2088 if (!_got_error) | |
2089 _rt.compute_ret_table(_method); | |
2090 | |
2091 // Step 2: Find all basic blocks and count GC points | |
2092 if (!_got_error) | |
2093 mark_bbheaders_and_count_gc_points(); | |
2094 | |
2095 // Step 3: Calculate stack maps | |
2096 if (!_got_error) | |
2097 do_interpretation(); | |
2098 | |
2099 // Step 4:Return results | |
2100 if (!_got_error && report_results()) | |
2101 report_result(); | |
2102 | |
2103 if (_got_error) { | |
2104 THROW_HANDLE(_exception); | |
2105 } | |
2106 } | |
2107 | |
2108 // Error handling methods | |
2109 // These methods create an exception for the current thread which is thrown | |
2110 // at the bottom of the call stack, when it returns to compute_map(). The | |
2111 // _got_error flag controls execution. NOT TODO: The VM exception propagation | |
2112 // mechanism using TRAPS/CHECKs could be used here instead but it would need | |
2113 // to be added as a parameter to every function and checked for every call. | |
2114 // The tons of extra code it would generate didn't seem worth the change. | |
2115 // | |
2116 void GenerateOopMap::error_work(const char *format, va_list ap) { | |
2117 _got_error = true; | |
2118 char msg_buffer[512]; | |
2119 vsnprintf(msg_buffer, sizeof(msg_buffer), format, ap); | |
2120 // Append method name | |
2121 char msg_buffer2[512]; | |
2122 jio_snprintf(msg_buffer2, sizeof(msg_buffer2), "%s in method %s", msg_buffer, method()->name()->as_C_string()); | |
2123 _exception = Exceptions::new_exception(Thread::current(), | |
2124 vmSymbols::java_lang_LinkageError(), msg_buffer2); | |
2125 } | |
2126 | |
2127 void GenerateOopMap::report_error(const char *format, ...) { | |
2128 va_list ap; | |
2129 va_start(ap, format); | |
2130 error_work(format, ap); | |
2131 } | |
2132 | |
2133 void GenerateOopMap::verify_error(const char *format, ...) { | |
2134 // We do not distinguish between different types of errors for verification | |
2135 // errors. Let the verifier give a better message. | |
2136 const char *msg = "Illegal class file encountered. Try running with -Xverify:all"; | |
1681
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2137 _got_error = true; |
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2138 // Append method name |
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2139 char msg_buffer2[512]; |
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2140 jio_snprintf(msg_buffer2, sizeof(msg_buffer2), "%s in method %s", msg, |
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2141 method()->name()->as_C_string()); |
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2142 _exception = Exceptions::new_exception(Thread::current(), |
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2143 vmSymbols::java_lang_LinkageError(), msg_buffer2); |
0 | 2144 } |
2145 | |
2146 // | |
2147 // Report result opcodes | |
2148 // | |
2149 void GenerateOopMap::report_result() { | |
2150 | |
2151 if (TraceNewOopMapGeneration) tty->print_cr("Report result pass"); | |
2152 | |
2153 // We now want to report the result of the parse | |
2154 _report_result = true; | |
2155 | |
2156 // Prolog code | |
2157 fill_stackmap_prolog(_gc_points); | |
2158 | |
2159 // Mark everything changed, then do one interpretation pass. | |
2160 for (int i = 0; i<_bb_count; i++) { | |
2161 if (_basic_blocks[i].is_reachable()) { | |
2162 _basic_blocks[i].set_changed(true); | |
2163 interp_bb(&_basic_blocks[i]); | |
2164 } | |
2165 } | |
2166 | |
2167 // Note: Since we are skipping dead-code when we are reporting results, then | |
2168 // the no. of encountered gc-points might be fewer than the previously number | |
2169 // we have counted. (dead-code is a pain - it should be removed before we get here) | |
2170 fill_stackmap_epilog(); | |
2171 | |
2172 // Report initvars | |
2173 fill_init_vars(_init_vars); | |
2174 | |
2175 _report_result = false; | |
2176 } | |
2177 | |
2178 void GenerateOopMap::result_for_basicblock(int bci) { | |
2179 if (TraceNewOopMapGeneration) tty->print_cr("Report result pass for basicblock"); | |
2180 | |
2181 // We now want to report the result of the parse | |
2182 _report_result = true; | |
2183 | |
2184 // Find basicblock and report results | |
2185 BasicBlock* bb = get_basic_block_containing(bci); | |
2186 assert(bb->is_reachable(), "getting result from unreachable basicblock"); | |
2187 bb->set_changed(true); | |
2188 interp_bb(bb); | |
2189 } | |
2190 | |
2191 // | |
2192 // Conflict handling code | |
2193 // | |
2194 | |
2195 void GenerateOopMap::record_refval_conflict(int varNo) { | |
2196 assert(varNo>=0 && varNo< _max_locals, "index out of range"); | |
2197 | |
2198 if (TraceOopMapRewrites) { | |
2199 tty->print("### Conflict detected (local no: %d)\n", varNo); | |
2200 } | |
2201 | |
2202 if (!_new_var_map) { | |
2203 _new_var_map = NEW_RESOURCE_ARRAY(int, _max_locals); | |
2204 for (int k = 0; k < _max_locals; k++) _new_var_map[k] = k; | |
2205 } | |
2206 | |
2207 if ( _new_var_map[varNo] == varNo) { | |
2208 // Check if max. number of locals has been reached | |
2209 if (_max_locals + _nof_refval_conflicts >= MAX_LOCAL_VARS) { | |
2210 report_error("Rewriting exceeded local variable limit"); | |
2211 return; | |
2212 } | |
2213 _new_var_map[varNo] = _max_locals + _nof_refval_conflicts; | |
2214 _nof_refval_conflicts++; | |
2215 } | |
2216 } | |
2217 | |
2218 void GenerateOopMap::rewrite_refval_conflicts() | |
2219 { | |
2220 // We can get here two ways: Either a rewrite conflict was detected, or | |
2221 // an uninitialize reference was detected. In the second case, we do not | |
2222 // do any rewriting, we just want to recompute the reference set with the | |
2223 // new information | |
2224 | |
2225 int nof_conflicts = 0; // Used for debugging only | |
2226 | |
2227 if ( _nof_refval_conflicts == 0 ) | |
2228 return; | |
2229 | |
2230 // Check if rewrites are allowed in this parse. | |
2231 if (!allow_rewrites() && !IgnoreRewrites) { | |
2232 fatal("Rewriting method not allowed at this stage"); | |
2233 } | |
2234 | |
2235 | |
2236 // This following flag is to tempoary supress rewrites. The locals that might conflict will | |
2237 // all be set to contain values. This is UNSAFE - however, until the rewriting has been completely | |
2238 // tested it is nice to have. | |
2239 if (IgnoreRewrites) { | |
2240 if (Verbose) { | |
2241 tty->print("rewrites suppressed for local no. "); | |
2242 for (int l = 0; l < _max_locals; l++) { | |
2243 if (_new_var_map[l] != l) { | |
2244 tty->print("%d ", l); | |
2245 vars()[l] = CellTypeState::value; | |
2246 } | |
2247 } | |
2248 tty->cr(); | |
2249 } | |
2250 | |
2251 // That was that... | |
2252 _new_var_map = NULL; | |
2253 _nof_refval_conflicts = 0; | |
2254 _conflict = false; | |
2255 | |
2256 return; | |
2257 } | |
2258 | |
2259 // Tracing flag | |
2260 _did_rewriting = true; | |
2261 | |
2262 if (TraceOopMapRewrites) { | |
2263 tty->print_cr("ref/value conflict for method %s - bytecodes are getting rewritten", method()->name()->as_C_string()); | |
2264 method()->print(); | |
2265 method()->print_codes(); | |
2266 } | |
2267 | |
2268 assert(_new_var_map!=NULL, "nothing to rewrite"); | |
2269 assert(_conflict==true, "We should not be here"); | |
2270 | |
2271 compute_ret_adr_at_TOS(); | |
2272 if (!_got_error) { | |
2273 for (int k = 0; k < _max_locals && !_got_error; k++) { | |
2274 if (_new_var_map[k] != k) { | |
2275 if (TraceOopMapRewrites) { | |
2276 tty->print_cr("Rewriting: %d -> %d", k, _new_var_map[k]); | |
2277 } | |
2278 rewrite_refval_conflict(k, _new_var_map[k]); | |
2279 if (_got_error) return; | |
2280 nof_conflicts++; | |
2281 } | |
2282 } | |
2283 } | |
2284 | |
2285 assert(nof_conflicts == _nof_refval_conflicts, "sanity check"); | |
2286 | |
2287 // Adjust the number of locals | |
2288 method()->set_max_locals(_max_locals+_nof_refval_conflicts); | |
2289 _max_locals += _nof_refval_conflicts; | |
2290 | |
2291 // That was that... | |
2292 _new_var_map = NULL; | |
2293 _nof_refval_conflicts = 0; | |
2294 } | |
2295 | |
2296 void GenerateOopMap::rewrite_refval_conflict(int from, int to) { | |
2297 bool startOver; | |
2298 do { | |
2299 // Make sure that the BytecodeStream is constructed in the loop, since | |
2300 // during rewriting a new method oop is going to be used, and the next time | |
2301 // around we want to use that. | |
2302 BytecodeStream bcs(_method); | |
2303 startOver = false; | |
2304 | |
2305 while( bcs.next() >=0 && !startOver && !_got_error) { | |
2306 startOver = rewrite_refval_conflict_inst(&bcs, from, to); | |
2307 } | |
2308 } while (startOver && !_got_error); | |
2309 } | |
2310 | |
2311 /* If the current instruction is one that uses local variable "from" | |
2312 in a ref way, change it to use "to". There's a subtle reason why we | |
2313 renumber the ref uses and not the non-ref uses: non-ref uses may be | |
2314 2 slots wide (double, long) which would necessitate keeping track of | |
2315 whether we should add one or two variables to the method. If the change | |
2316 affected the width of some instruction, returns "TRUE"; otherwise, returns "FALSE". | |
2317 Another reason for moving ref's value is for solving (addr, ref) conflicts, which | |
2318 both uses aload/astore methods. | |
2319 */ | |
2320 bool GenerateOopMap::rewrite_refval_conflict_inst(BytecodeStream *itr, int from, int to) { | |
2321 Bytecodes::Code bc = itr->code(); | |
2322 int index; | |
2323 int bci = itr->bci(); | |
2324 | |
2325 if (is_aload(itr, &index) && index == from) { | |
2326 if (TraceOopMapRewrites) { | |
2327 tty->print_cr("Rewriting aload at bci: %d", bci); | |
2328 } | |
2329 return rewrite_load_or_store(itr, Bytecodes::_aload, Bytecodes::_aload_0, to); | |
2330 } | |
2331 | |
2332 if (is_astore(itr, &index) && index == from) { | |
2333 if (!stack_top_holds_ret_addr(bci)) { | |
2334 if (TraceOopMapRewrites) { | |
2335 tty->print_cr("Rewriting astore at bci: %d", bci); | |
2336 } | |
2337 return rewrite_load_or_store(itr, Bytecodes::_astore, Bytecodes::_astore_0, to); | |
2338 } else { | |
2339 if (TraceOopMapRewrites) { | |
2340 tty->print_cr("Supress rewriting of astore at bci: %d", bci); | |
2341 } | |
2342 } | |
2343 } | |
2344 | |
2345 return false; | |
2346 } | |
2347 | |
2348 // The argument to this method is: | |
2349 // bc : Current bytecode | |
2350 // bcN : either _aload or _astore | |
2351 // bc0 : either _aload_0 or _astore_0 | |
2352 bool GenerateOopMap::rewrite_load_or_store(BytecodeStream *bcs, Bytecodes::Code bcN, Bytecodes::Code bc0, unsigned int varNo) { | |
2353 assert(bcN == Bytecodes::_astore || bcN == Bytecodes::_aload, "wrong argument (bcN)"); | |
2354 assert(bc0 == Bytecodes::_astore_0 || bc0 == Bytecodes::_aload_0, "wrong argument (bc0)"); | |
2142 | 2355 int ilen = Bytecodes::length_at(_method(), bcs->bcp()); |
0 | 2356 int newIlen; |
2357 | |
2358 if (ilen == 4) { | |
2359 // Original instruction was wide; keep it wide for simplicity | |
2360 newIlen = 4; | |
2361 } else if (varNo < 4) | |
2362 newIlen = 1; | |
2363 else if (varNo >= 256) | |
2364 newIlen = 4; | |
2365 else | |
2366 newIlen = 2; | |
2367 | |
2368 // If we need to relocate in order to patch the byte, we | |
2369 // do the patching in a temp. buffer, that is passed to the reloc. | |
2370 // The patching of the bytecode stream is then done by the Relocator. | |
2371 // This is neccesary, since relocating the instruction at a certain bci, might | |
2372 // also relocate that instruction, e.g., if a _goto before it gets widen to a _goto_w. | |
2373 // Hence, we do not know which bci to patch after relocation. | |
2374 | |
2375 assert(newIlen <= 4, "sanity check"); | |
2376 u_char inst_buffer[4]; // Max. instruction size is 4. | |
2377 address bcp; | |
2378 | |
2379 if (newIlen != ilen) { | |
2380 // Relocation needed do patching in temp. buffer | |
2381 bcp = (address)inst_buffer; | |
2382 } else { | |
2383 bcp = _method->bcp_from(bcs->bci()); | |
2384 } | |
2385 | |
2386 // Patch either directly in methodOop or in temp. buffer | |
2387 if (newIlen == 1) { | |
2388 assert(varNo < 4, "varNo too large"); | |
2389 *bcp = bc0 + varNo; | |
2390 } else if (newIlen == 2) { | |
2391 assert(varNo < 256, "2-byte index needed!"); | |
2392 *(bcp + 0) = bcN; | |
2393 *(bcp + 1) = varNo; | |
2394 } else { | |
2395 assert(newIlen == 4, "Wrong instruction length"); | |
2396 *(bcp + 0) = Bytecodes::_wide; | |
2397 *(bcp + 1) = bcN; | |
2398 Bytes::put_Java_u2(bcp+2, varNo); | |
2399 } | |
2400 | |
2401 if (newIlen != ilen) { | |
2402 expand_current_instr(bcs->bci(), ilen, newIlen, inst_buffer); | |
2403 } | |
2404 | |
2405 | |
2406 return (newIlen != ilen); | |
2407 } | |
2408 | |
2409 class RelocCallback : public RelocatorListener { | |
2410 private: | |
2411 GenerateOopMap* _gom; | |
2412 public: | |
2413 RelocCallback(GenerateOopMap* gom) { _gom = gom; }; | |
2414 | |
2415 // Callback method | |
2416 virtual void relocated(int bci, int delta, int new_code_length) { | |
2417 _gom->update_basic_blocks (bci, delta, new_code_length); | |
2418 _gom->update_ret_adr_at_TOS(bci, delta); | |
2419 _gom->_rt.update_ret_table (bci, delta); | |
2420 } | |
2421 }; | |
2422 | |
2423 // Returns true if expanding was succesful. Otherwise, reports an error and | |
2424 // returns false. | |
2425 void GenerateOopMap::expand_current_instr(int bci, int ilen, int newIlen, u_char inst_buffer[]) { | |
2426 Thread *THREAD = Thread::current(); // Could really have TRAPS argument. | |
2427 RelocCallback rcb(this); | |
2428 Relocator rc(_method, &rcb); | |
2429 methodHandle m= rc.insert_space_at(bci, newIlen, inst_buffer, THREAD); | |
2430 if (m.is_null() || HAS_PENDING_EXCEPTION) { | |
2431 report_error("could not rewrite method - exception occurred or bytecode buffer overflow"); | |
2432 return; | |
2433 } | |
2434 | |
2435 // Relocator returns a new method oop. | |
2436 _did_relocation = true; | |
2437 _method = m; | |
2438 } | |
2439 | |
2440 | |
2441 bool GenerateOopMap::is_astore(BytecodeStream *itr, int *index) { | |
2442 Bytecodes::Code bc = itr->code(); | |
2443 switch(bc) { | |
2444 case Bytecodes::_astore_0: | |
2445 case Bytecodes::_astore_1: | |
2446 case Bytecodes::_astore_2: | |
2447 case Bytecodes::_astore_3: | |
2448 *index = bc - Bytecodes::_astore_0; | |
2449 return true; | |
2450 case Bytecodes::_astore: | |
2451 *index = itr->get_index(); | |
2452 return true; | |
2453 } | |
2454 return false; | |
2455 } | |
2456 | |
2457 bool GenerateOopMap::is_aload(BytecodeStream *itr, int *index) { | |
2458 Bytecodes::Code bc = itr->code(); | |
2459 switch(bc) { | |
2460 case Bytecodes::_aload_0: | |
2461 case Bytecodes::_aload_1: | |
2462 case Bytecodes::_aload_2: | |
2463 case Bytecodes::_aload_3: | |
2464 *index = bc - Bytecodes::_aload_0; | |
2465 return true; | |
2466 | |
2467 case Bytecodes::_aload: | |
2468 *index = itr->get_index(); | |
2469 return true; | |
2470 } | |
2471 return false; | |
2472 } | |
2473 | |
2474 | |
2475 // Return true iff the top of the operand stack holds a return address at | |
2476 // the current instruction | |
2477 bool GenerateOopMap::stack_top_holds_ret_addr(int bci) { | |
2478 for(int i = 0; i < _ret_adr_tos->length(); i++) { | |
2479 if (_ret_adr_tos->at(i) == bci) | |
2480 return true; | |
2481 } | |
2482 | |
2483 return false; | |
2484 } | |
2485 | |
2486 void GenerateOopMap::compute_ret_adr_at_TOS() { | |
2487 assert(_ret_adr_tos != NULL, "must be initialized"); | |
2488 _ret_adr_tos->clear(); | |
2489 | |
2490 for (int i = 0; i < bb_count(); i++) { | |
2491 BasicBlock* bb = &_basic_blocks[i]; | |
2492 | |
2493 // Make sure to only check basicblocks that are reachable | |
2494 if (bb->is_reachable()) { | |
2495 | |
2496 // For each Basic block we check all instructions | |
2497 BytecodeStream bcs(_method); | |
2498 bcs.set_interval(bb->_bci, next_bb_start_pc(bb)); | |
2499 | |
2500 restore_state(bb); | |
2501 | |
2502 while (bcs.next()>=0 && !_got_error) { | |
2503 // TDT: should this be is_good_address() ? | |
2504 if (_stack_top > 0 && stack()[_stack_top-1].is_address()) { | |
2505 _ret_adr_tos->append(bcs.bci()); | |
2506 if (TraceNewOopMapGeneration) { | |
2507 tty->print_cr("Ret_adr TOS at bci: %d", bcs.bci()); | |
2508 } | |
2509 } | |
2510 interp1(&bcs); | |
2511 } | |
2512 } | |
2513 } | |
2514 } | |
2515 | |
2516 void GenerateOopMap::update_ret_adr_at_TOS(int bci, int delta) { | |
2517 for(int i = 0; i < _ret_adr_tos->length(); i++) { | |
2518 int v = _ret_adr_tos->at(i); | |
2519 if (v > bci) _ret_adr_tos->at_put(i, v + delta); | |
2520 } | |
2521 } | |
2522 | |
2523 // =================================================================== | |
2524 | |
2525 #ifndef PRODUCT | |
2526 int ResolveOopMapConflicts::_nof_invocations = 0; | |
2527 int ResolveOopMapConflicts::_nof_rewrites = 0; | |
2528 int ResolveOopMapConflicts::_nof_relocations = 0; | |
2529 #endif | |
2530 | |
2531 methodHandle ResolveOopMapConflicts::do_potential_rewrite(TRAPS) { | |
2532 compute_map(CHECK_(methodHandle())); | |
2533 | |
2534 #ifndef PRODUCT | |
2535 // Tracking and statistics | |
2536 if (PrintRewrites) { | |
2537 _nof_invocations++; | |
2538 if (did_rewriting()) { | |
2539 _nof_rewrites++; | |
2540 if (did_relocation()) _nof_relocations++; | |
2541 tty->print("Method was rewritten %s: ", (did_relocation()) ? "and relocated" : ""); | |
2542 method()->print_value(); tty->cr(); | |
2543 tty->print_cr("Cand.: %d rewrts: %d (%d%%) reloc.: %d (%d%%)", | |
2544 _nof_invocations, | |
2545 _nof_rewrites, (_nof_rewrites * 100) / _nof_invocations, | |
2546 _nof_relocations, (_nof_relocations * 100) / _nof_invocations); | |
2547 } | |
2548 } | |
2549 #endif | |
2550 return methodHandle(THREAD, method()); | |
2551 } |