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annotate src/share/vm/compiler/methodLiveness.cpp @ 19011:203c7256e123
Merge.
author | Chris Seaton <chris.seaton@oracle.com> |
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date | Thu, 29 Jan 2015 00:12:55 +0000 |
parents | 78bbf4d43a14 |
children | ab5fbf410512 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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 "ci/ciMethod.hpp" | |
27 #include "ci/ciMethodBlocks.hpp" | |
28 #include "ci/ciStreams.hpp" | |
29 #include "compiler/methodLiveness.hpp" | |
30 #include "interpreter/bytecode.hpp" | |
31 #include "interpreter/bytecodes.hpp" | |
32 #include "memory/allocation.inline.hpp" | |
33 #include "utilities/bitMap.inline.hpp" | |
34 | |
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35 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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36 |
0 | 37 // The MethodLiveness class performs a simple liveness analysis on a method |
38 // in order to decide which locals are live (that is, will be used again) at | |
39 // a particular bytecode index (bci). | |
40 // | |
41 // The algorithm goes: | |
42 // | |
43 // 1. Break the method into a set of basic blocks. For each basic block we | |
44 // also keep track of its set of predecessors through normal control flow | |
45 // and predecessors through exceptional control flow. | |
46 // | |
47 // 2. For each basic block, compute two sets, gen (the set of values used before | |
48 // they are defined) and kill (the set of values defined before they are used) | |
49 // in the basic block. A basic block "needs" the locals in its gen set to | |
50 // perform its computation. A basic block "provides" values for the locals in | |
51 // its kill set, allowing a need from a successor to be ignored. | |
52 // | |
53 // 3. Liveness information (the set of locals which are needed) is pushed backwards through | |
54 // the program, from blocks to their predecessors. We compute and store liveness | |
55 // information for the normal/exceptional exit paths for each basic block. When | |
56 // this process reaches a fixed point, we are done. | |
57 // | |
58 // 4. When we are asked about the liveness at a particular bci with a basic block, we | |
59 // compute gen/kill sets which represent execution from that bci to the exit of | |
60 // its blocks. We then compose this range gen/kill information with the normal | |
61 // and exceptional exit information for the block to produce liveness information | |
62 // at that bci. | |
63 // | |
64 // The algorithm is approximate in many respects. Notably: | |
65 // | |
66 // 1. We do not do the analysis necessary to match jsr's with the appropriate ret. | |
67 // Instead we make the conservative assumption that any ret can return to any | |
68 // jsr return site. | |
69 // 2. Instead of computing the effects of exceptions at every instruction, we | |
70 // summarize the effects of all exceptional continuations from the block as | |
71 // a single set (_exception_exit), losing some information but simplifying the | |
72 // analysis. | |
73 | |
74 | |
75 //-------------------------------------------------------------------------- | |
76 // The BitCounter class is used for counting the number of bits set in | |
77 // some BitMap. It is only used when collecting liveness statistics. | |
78 | |
79 #ifndef PRODUCT | |
80 | |
81 class BitCounter: public BitMapClosure { | |
82 private: | |
83 int _count; | |
84 public: | |
85 BitCounter() : _count(0) {} | |
86 | |
87 // Callback when bit in map is set | |
342 | 88 virtual bool do_bit(size_t offset) { |
0 | 89 _count++; |
342 | 90 return true; |
0 | 91 } |
92 | |
93 int count() { | |
94 return _count; | |
95 } | |
96 }; | |
97 | |
98 | |
99 //-------------------------------------------------------------------------- | |
100 | |
101 | |
102 // Counts | |
103 long MethodLiveness::_total_bytes = 0; | |
104 int MethodLiveness::_total_methods = 0; | |
105 | |
106 long MethodLiveness::_total_blocks = 0; | |
107 int MethodLiveness::_max_method_blocks = 0; | |
108 | |
109 long MethodLiveness::_total_edges = 0; | |
110 int MethodLiveness::_max_block_edges = 0; | |
111 | |
112 long MethodLiveness::_total_exc_edges = 0; | |
113 int MethodLiveness::_max_block_exc_edges = 0; | |
114 | |
115 long MethodLiveness::_total_method_locals = 0; | |
116 int MethodLiveness::_max_method_locals = 0; | |
117 | |
118 long MethodLiveness::_total_locals_queried = 0; | |
119 long MethodLiveness::_total_live_locals_queried = 0; | |
120 | |
121 long MethodLiveness::_total_visits = 0; | |
122 | |
123 #endif | |
124 | |
125 // Timers | |
126 elapsedTimer MethodLiveness::_time_build_graph; | |
127 elapsedTimer MethodLiveness::_time_gen_kill; | |
128 elapsedTimer MethodLiveness::_time_flow; | |
129 elapsedTimer MethodLiveness::_time_query; | |
130 elapsedTimer MethodLiveness::_time_total; | |
131 | |
132 MethodLiveness::MethodLiveness(Arena* arena, ciMethod* method) | |
133 #ifdef COMPILER1 | |
134 : _bci_block_start((uintptr_t*)arena->Amalloc((method->code_size() >> LogBitsPerByte) + 1), method->code_size()) | |
135 #endif | |
136 { | |
137 _arena = arena; | |
138 _method = method; | |
139 _bit_map_size_bits = method->max_locals(); | |
140 _bit_map_size_words = (_bit_map_size_bits / sizeof(unsigned int)) + 1; | |
141 | |
142 #ifdef COMPILER1 | |
143 _bci_block_start.clear(); | |
144 #endif | |
145 } | |
146 | |
147 void MethodLiveness::compute_liveness() { | |
148 #ifndef PRODUCT | |
149 if (TraceLivenessGen) { | |
150 tty->print_cr("################################################################"); | |
151 tty->print("# Computing liveness information for "); | |
152 method()->print_short_name(); | |
153 } | |
154 | |
155 if (TimeLivenessAnalysis) _time_total.start(); | |
156 #endif | |
157 | |
158 { | |
159 TraceTime buildGraph(NULL, &_time_build_graph, TimeLivenessAnalysis); | |
160 init_basic_blocks(); | |
161 } | |
162 { | |
163 TraceTime genKill(NULL, &_time_gen_kill, TimeLivenessAnalysis); | |
164 init_gen_kill(); | |
165 } | |
166 { | |
167 TraceTime flow(NULL, &_time_flow, TimeLivenessAnalysis); | |
168 propagate_liveness(); | |
169 } | |
170 | |
171 #ifndef PRODUCT | |
172 if (TimeLivenessAnalysis) _time_total.stop(); | |
173 | |
174 if (TimeLivenessAnalysis) { | |
175 // Collect statistics | |
176 _total_bytes += method()->code_size(); | |
177 _total_methods++; | |
178 | |
179 int num_blocks = _block_count; | |
180 _total_blocks += num_blocks; | |
181 _max_method_blocks = MAX2(num_blocks,_max_method_blocks); | |
182 | |
183 for (int i=0; i<num_blocks; i++) { | |
184 BasicBlock *block = _block_list[i]; | |
185 | |
186 int numEdges = block->_normal_predecessors->length(); | |
187 int numExcEdges = block->_exception_predecessors->length(); | |
188 | |
189 _total_edges += numEdges; | |
190 _total_exc_edges += numExcEdges; | |
191 _max_block_edges = MAX2(numEdges,_max_block_edges); | |
192 _max_block_exc_edges = MAX2(numExcEdges,_max_block_exc_edges); | |
193 } | |
194 | |
195 int numLocals = _bit_map_size_bits; | |
196 _total_method_locals += numLocals; | |
197 _max_method_locals = MAX2(numLocals,_max_method_locals); | |
198 } | |
199 #endif | |
200 } | |
201 | |
202 | |
203 void MethodLiveness::init_basic_blocks() { | |
204 bool bailout = false; | |
205 | |
206 int method_len = method()->code_size(); | |
207 ciMethodBlocks *mblocks = method()->get_method_blocks(); | |
208 | |
209 // Create an array to store the bci->BasicBlock mapping. | |
210 _block_map = new (arena()) GrowableArray<BasicBlock*>(arena(), method_len, method_len, NULL); | |
211 | |
212 _block_count = mblocks->num_blocks(); | |
213 _block_list = (BasicBlock **) arena()->Amalloc(sizeof(BasicBlock *) * _block_count); | |
214 | |
215 // Used for patching up jsr/ret control flow. | |
216 GrowableArray<BasicBlock*>* jsr_exit_list = new GrowableArray<BasicBlock*>(5); | |
217 GrowableArray<BasicBlock*>* ret_list = new GrowableArray<BasicBlock*>(5); | |
218 | |
219 // generate our block list from ciMethodBlocks | |
220 for (int blk = 0; blk < _block_count; blk++) { | |
221 ciBlock *cib = mblocks->block(blk); | |
222 int start_bci = cib->start_bci(); | |
223 _block_list[blk] = new (arena()) BasicBlock(this, start_bci, cib->limit_bci()); | |
224 _block_map->at_put(start_bci, _block_list[blk]); | |
225 #ifdef COMPILER1 | |
226 // mark all bcis where a new basic block starts | |
227 _bci_block_start.set_bit(start_bci); | |
228 #endif // COMPILER1 | |
229 } | |
230 // fill in the predecessors of blocks | |
231 ciBytecodeStream bytes(method()); | |
232 | |
233 for (int blk = 0; blk < _block_count; blk++) { | |
234 BasicBlock *current_block = _block_list[blk]; | |
235 int bci = mblocks->block(blk)->control_bci(); | |
236 | |
237 if (bci == ciBlock::fall_through_bci) { | |
238 int limit = current_block->limit_bci(); | |
239 if (limit < method_len) { | |
240 BasicBlock *next = _block_map->at(limit); | |
241 assert( next != NULL, "must be a block immediately following this one."); | |
242 next->add_normal_predecessor(current_block); | |
243 } | |
244 continue; | |
245 } | |
246 bytes.reset_to_bci(bci); | |
247 Bytecodes::Code code = bytes.next(); | |
248 BasicBlock *dest; | |
249 | |
250 // Now we need to interpret the instruction's effect | |
251 // on control flow. | |
252 assert (current_block != NULL, "we must have a current block"); | |
253 switch (code) { | |
254 case Bytecodes::_ifeq: | |
255 case Bytecodes::_ifne: | |
256 case Bytecodes::_iflt: | |
257 case Bytecodes::_ifge: | |
258 case Bytecodes::_ifgt: | |
259 case Bytecodes::_ifle: | |
260 case Bytecodes::_if_icmpeq: | |
261 case Bytecodes::_if_icmpne: | |
262 case Bytecodes::_if_icmplt: | |
263 case Bytecodes::_if_icmpge: | |
264 case Bytecodes::_if_icmpgt: | |
265 case Bytecodes::_if_icmple: | |
266 case Bytecodes::_if_acmpeq: | |
267 case Bytecodes::_if_acmpne: | |
268 case Bytecodes::_ifnull: | |
269 case Bytecodes::_ifnonnull: | |
270 // Two way branch. Set predecessors at each destination. | |
271 dest = _block_map->at(bytes.next_bci()); | |
272 assert(dest != NULL, "must be a block immediately following this one."); | |
273 dest->add_normal_predecessor(current_block); | |
274 | |
275 dest = _block_map->at(bytes.get_dest()); | |
276 assert(dest != NULL, "branch desination must start a block."); | |
277 dest->add_normal_predecessor(current_block); | |
278 break; | |
279 case Bytecodes::_goto: | |
280 dest = _block_map->at(bytes.get_dest()); | |
281 assert(dest != NULL, "branch desination must start a block."); | |
282 dest->add_normal_predecessor(current_block); | |
283 break; | |
284 case Bytecodes::_goto_w: | |
285 dest = _block_map->at(bytes.get_far_dest()); | |
286 assert(dest != NULL, "branch desination must start a block."); | |
287 dest->add_normal_predecessor(current_block); | |
288 break; | |
289 case Bytecodes::_tableswitch: | |
290 { | |
2142 | 291 Bytecode_tableswitch tableswitch(&bytes); |
0 | 292 |
2142 | 293 int len = tableswitch.length(); |
0 | 294 |
2142 | 295 dest = _block_map->at(bci + tableswitch.default_offset()); |
0 | 296 assert(dest != NULL, "branch desination must start a block."); |
297 dest->add_normal_predecessor(current_block); | |
298 while (--len >= 0) { | |
2142 | 299 dest = _block_map->at(bci + tableswitch.dest_offset_at(len)); |
0 | 300 assert(dest != NULL, "branch desination must start a block."); |
301 dest->add_normal_predecessor(current_block); | |
302 } | |
303 break; | |
304 } | |
305 | |
306 case Bytecodes::_lookupswitch: | |
307 { | |
2142 | 308 Bytecode_lookupswitch lookupswitch(&bytes); |
0 | 309 |
2142 | 310 int npairs = lookupswitch.number_of_pairs(); |
0 | 311 |
2142 | 312 dest = _block_map->at(bci + lookupswitch.default_offset()); |
0 | 313 assert(dest != NULL, "branch desination must start a block."); |
314 dest->add_normal_predecessor(current_block); | |
315 while(--npairs >= 0) { | |
2142 | 316 LookupswitchPair pair = lookupswitch.pair_at(npairs); |
317 dest = _block_map->at( bci + pair.offset()); | |
0 | 318 assert(dest != NULL, "branch desination must start a block."); |
319 dest->add_normal_predecessor(current_block); | |
320 } | |
321 break; | |
322 } | |
323 | |
324 case Bytecodes::_jsr: | |
325 { | |
326 assert(bytes.is_wide()==false, "sanity check"); | |
327 dest = _block_map->at(bytes.get_dest()); | |
328 assert(dest != NULL, "branch desination must start a block."); | |
329 dest->add_normal_predecessor(current_block); | |
330 BasicBlock *jsrExit = _block_map->at(current_block->limit_bci()); | |
331 assert(jsrExit != NULL, "jsr return bci must start a block."); | |
332 jsr_exit_list->append(jsrExit); | |
333 break; | |
334 } | |
335 case Bytecodes::_jsr_w: | |
336 { | |
337 dest = _block_map->at(bytes.get_far_dest()); | |
338 assert(dest != NULL, "branch desination must start a block."); | |
339 dest->add_normal_predecessor(current_block); | |
340 BasicBlock *jsrExit = _block_map->at(current_block->limit_bci()); | |
341 assert(jsrExit != NULL, "jsr return bci must start a block."); | |
342 jsr_exit_list->append(jsrExit); | |
343 break; | |
344 } | |
345 | |
346 case Bytecodes::_wide: | |
347 assert(false, "wide opcodes should not be seen here"); | |
348 break; | |
349 case Bytecodes::_athrow: | |
350 case Bytecodes::_ireturn: | |
351 case Bytecodes::_lreturn: | |
352 case Bytecodes::_freturn: | |
353 case Bytecodes::_dreturn: | |
354 case Bytecodes::_areturn: | |
355 case Bytecodes::_return: | |
356 // These opcodes are not the normal predecessors of any other opcodes. | |
357 break; | |
358 case Bytecodes::_ret: | |
359 // We will patch up jsr/rets in a subsequent pass. | |
360 ret_list->append(current_block); | |
361 break; | |
362 case Bytecodes::_breakpoint: | |
363 // Bail out of there are breakpoints in here. | |
364 bailout = true; | |
365 break; | |
366 default: | |
367 // Do nothing. | |
368 break; | |
369 } | |
370 } | |
371 // Patch up the jsr/ret's. We conservatively assume that any ret | |
372 // can return to any jsr site. | |
373 int ret_list_len = ret_list->length(); | |
374 int jsr_exit_list_len = jsr_exit_list->length(); | |
375 if (ret_list_len > 0 && jsr_exit_list_len > 0) { | |
376 for (int i = jsr_exit_list_len - 1; i >= 0; i--) { | |
377 BasicBlock *jsrExit = jsr_exit_list->at(i); | |
378 for (int i = ret_list_len - 1; i >= 0; i--) { | |
379 jsrExit->add_normal_predecessor(ret_list->at(i)); | |
380 } | |
381 } | |
382 } | |
383 | |
384 // Compute exception edges. | |
385 for (int b=_block_count-1; b >= 0; b--) { | |
386 BasicBlock *block = _block_list[b]; | |
387 int block_start = block->start_bci(); | |
388 int block_limit = block->limit_bci(); | |
389 ciExceptionHandlerStream handlers(method()); | |
390 for (; !handlers.is_done(); handlers.next()) { | |
391 ciExceptionHandler* handler = handlers.handler(); | |
392 int start = handler->start(); | |
393 int limit = handler->limit(); | |
394 int handler_bci = handler->handler_bci(); | |
395 | |
396 int intersect_start = MAX2(block_start, start); | |
397 int intersect_limit = MIN2(block_limit, limit); | |
398 if (intersect_start < intersect_limit) { | |
399 // The catch range has a nonempty intersection with this | |
400 // basic block. That means this basic block can be an | |
401 // exceptional predecessor. | |
402 _block_map->at(handler_bci)->add_exception_predecessor(block); | |
403 | |
404 if (handler->is_catch_all()) { | |
405 // This is a catch-all block. | |
406 if (intersect_start == block_start && intersect_limit == block_limit) { | |
407 // The basic block is entirely contained in this catch-all block. | |
408 // Skip the rest of the exception handlers -- they can never be | |
409 // reached in execution. | |
410 break; | |
411 } | |
412 } | |
413 } | |
414 } | |
415 } | |
416 } | |
417 | |
418 void MethodLiveness::init_gen_kill() { | |
419 for (int i=_block_count-1; i >= 0; i--) { | |
420 _block_list[i]->compute_gen_kill(method()); | |
421 } | |
422 } | |
423 | |
424 void MethodLiveness::propagate_liveness() { | |
425 int num_blocks = _block_count; | |
426 BasicBlock *block; | |
427 | |
428 // We start our work list off with all blocks in it. | |
429 // Alternately, we could start off the work list with the list of all | |
430 // blocks which could exit the method directly, along with one block | |
431 // from any infinite loop. If this matters, it can be changed. It | |
432 // may not be clear from looking at the code, but the order of the | |
433 // workList will be the opposite of the creation order of the basic | |
434 // blocks, which should be decent for quick convergence (with the | |
435 // possible exception of exception handlers, which are all created | |
436 // early). | |
437 _work_list = NULL; | |
438 for (int i = 0; i < num_blocks; i++) { | |
439 block = _block_list[i]; | |
440 block->set_next(_work_list); | |
441 block->set_on_work_list(true); | |
442 _work_list = block; | |
443 } | |
444 | |
445 | |
446 while ((block = work_list_get()) != NULL) { | |
447 block->propagate(this); | |
448 NOT_PRODUCT(_total_visits++;) | |
449 } | |
450 } | |
451 | |
452 void MethodLiveness::work_list_add(BasicBlock *block) { | |
453 if (!block->on_work_list()) { | |
454 block->set_next(_work_list); | |
455 block->set_on_work_list(true); | |
456 _work_list = block; | |
457 } | |
458 } | |
459 | |
460 MethodLiveness::BasicBlock *MethodLiveness::work_list_get() { | |
461 BasicBlock *block = _work_list; | |
462 if (block != NULL) { | |
463 block->set_on_work_list(false); | |
464 _work_list = block->next(); | |
465 } | |
466 return block; | |
467 } | |
468 | |
469 | |
470 MethodLivenessResult MethodLiveness::get_liveness_at(int entry_bci) { | |
471 int bci = entry_bci; | |
472 bool is_entry = false; | |
473 if (entry_bci == InvocationEntryBci) { | |
474 is_entry = true; | |
475 bci = 0; | |
476 } | |
477 | |
342 | 478 MethodLivenessResult answer((uintptr_t*)NULL,0); |
0 | 479 |
480 if (_block_count > 0) { | |
481 if (TimeLivenessAnalysis) _time_total.start(); | |
482 if (TimeLivenessAnalysis) _time_query.start(); | |
483 | |
484 assert( 0 <= bci && bci < method()->code_size(), "bci out of range" ); | |
485 BasicBlock *block = _block_map->at(bci); | |
486 // We may not be at the block start, so search backwards to find the block | |
487 // containing bci. | |
488 int t = bci; | |
489 while (block == NULL && t > 0) { | |
490 block = _block_map->at(--t); | |
491 } | |
492 assert( block != NULL, "invalid bytecode index; must be instruction index" ); | |
493 assert(bci >= block->start_bci() && bci < block->limit_bci(), "block must contain bci."); | |
494 | |
495 answer = block->get_liveness_at(method(), bci); | |
496 | |
497 if (is_entry && method()->is_synchronized() && !method()->is_static()) { | |
498 // Synchronized methods use the receiver once on entry. | |
499 answer.at_put(0, true); | |
500 } | |
501 | |
502 #ifndef PRODUCT | |
503 if (TraceLivenessQuery) { | |
504 tty->print("Liveness query of "); | |
505 method()->print_short_name(); | |
506 tty->print(" @ %d : result is ", bci); | |
507 answer.print_on(tty); | |
508 } | |
509 | |
510 if (TimeLivenessAnalysis) _time_query.stop(); | |
511 if (TimeLivenessAnalysis) _time_total.stop(); | |
512 #endif | |
513 } | |
514 | |
515 #ifndef PRODUCT | |
516 if (TimeLivenessAnalysis) { | |
517 // Collect statistics. | |
518 _total_locals_queried += _bit_map_size_bits; | |
519 BitCounter counter; | |
520 answer.iterate(&counter); | |
521 _total_live_locals_queried += counter.count(); | |
522 } | |
523 #endif | |
524 | |
525 return answer; | |
526 } | |
527 | |
528 | |
529 #ifndef PRODUCT | |
530 | |
531 void MethodLiveness::print_times() { | |
532 tty->print_cr ("Accumulated liveness analysis times/statistics:"); | |
533 tty->print_cr ("-----------------------------------------------"); | |
534 tty->print_cr (" Total : %3.3f sec.", _time_total.seconds()); | |
535 tty->print_cr (" Build graph : %3.3f sec. (%2.2f%%)", _time_build_graph.seconds(), | |
536 _time_build_graph.seconds() * 100 / _time_total.seconds()); | |
537 tty->print_cr (" Gen / Kill : %3.3f sec. (%2.2f%%)", _time_gen_kill.seconds(), | |
538 _time_gen_kill.seconds() * 100 / _time_total.seconds()); | |
539 tty->print_cr (" Dataflow : %3.3f sec. (%2.2f%%)", _time_flow.seconds(), | |
540 _time_flow.seconds() * 100 / _time_total.seconds()); | |
541 tty->print_cr (" Query : %3.3f sec. (%2.2f%%)", _time_query.seconds(), | |
542 _time_query.seconds() * 100 / _time_total.seconds()); | |
543 tty->print_cr (" #bytes : %8d (%3.0f bytes per sec)", | |
544 _total_bytes, | |
545 _total_bytes / _time_total.seconds()); | |
546 tty->print_cr (" #methods : %8d (%3.0f methods per sec)", | |
547 _total_methods, | |
548 _total_methods / _time_total.seconds()); | |
549 tty->print_cr (" avg locals : %3.3f max locals : %3d", | |
550 (float)_total_method_locals / _total_methods, | |
551 _max_method_locals); | |
552 tty->print_cr (" avg blocks : %3.3f max blocks : %3d", | |
553 (float)_total_blocks / _total_methods, | |
554 _max_method_blocks); | |
555 tty->print_cr (" avg bytes : %3.3f", | |
556 (float)_total_bytes / _total_methods); | |
557 tty->print_cr (" #blocks : %8d", | |
558 _total_blocks); | |
559 tty->print_cr (" avg normal predecessors : %3.3f max normal predecessors : %3d", | |
560 (float)_total_edges / _total_blocks, | |
561 _max_block_edges); | |
562 tty->print_cr (" avg exception predecessors : %3.3f max exception predecessors : %3d", | |
563 (float)_total_exc_edges / _total_blocks, | |
564 _max_block_exc_edges); | |
565 tty->print_cr (" avg visits : %3.3f", | |
566 (float)_total_visits / _total_blocks); | |
567 tty->print_cr (" #locals queried : %8d #live : %8d %%live : %2.2f%%", | |
568 _total_locals_queried, | |
569 _total_live_locals_queried, | |
570 100.0 * _total_live_locals_queried / _total_locals_queried); | |
571 } | |
572 | |
573 #endif | |
574 | |
575 | |
576 MethodLiveness::BasicBlock::BasicBlock(MethodLiveness *analyzer, int start, int limit) : | |
577 _gen((uintptr_t*)analyzer->arena()->Amalloc(BytesPerWord * analyzer->bit_map_size_words()), | |
578 analyzer->bit_map_size_bits()), | |
579 _kill((uintptr_t*)analyzer->arena()->Amalloc(BytesPerWord * analyzer->bit_map_size_words()), | |
580 analyzer->bit_map_size_bits()), | |
581 _entry((uintptr_t*)analyzer->arena()->Amalloc(BytesPerWord * analyzer->bit_map_size_words()), | |
582 analyzer->bit_map_size_bits()), | |
583 _normal_exit((uintptr_t*)analyzer->arena()->Amalloc(BytesPerWord * analyzer->bit_map_size_words()), | |
584 analyzer->bit_map_size_bits()), | |
585 _exception_exit((uintptr_t*)analyzer->arena()->Amalloc(BytesPerWord * analyzer->bit_map_size_words()), | |
586 analyzer->bit_map_size_bits()), | |
587 _last_bci(-1) { | |
588 _analyzer = analyzer; | |
589 _start_bci = start; | |
590 _limit_bci = limit; | |
591 _normal_predecessors = | |
592 new (analyzer->arena()) GrowableArray<MethodLiveness::BasicBlock*>(analyzer->arena(), 5, 0, NULL); | |
593 _exception_predecessors = | |
594 new (analyzer->arena()) GrowableArray<MethodLiveness::BasicBlock*>(analyzer->arena(), 5, 0, NULL); | |
595 _normal_exit.clear(); | |
596 _exception_exit.clear(); | |
597 _entry.clear(); | |
598 | |
599 // this initialization is not strictly necessary. | |
600 // _gen and _kill are cleared at the beginning of compute_gen_kill_range() | |
601 _gen.clear(); | |
602 _kill.clear(); | |
603 } | |
604 | |
605 | |
606 | |
607 MethodLiveness::BasicBlock *MethodLiveness::BasicBlock::split(int split_bci) { | |
608 int start = _start_bci; | |
609 int limit = _limit_bci; | |
610 | |
611 if (TraceLivenessGen) { | |
612 tty->print_cr(" ** Splitting block (%d,%d) at %d", start, limit, split_bci); | |
613 } | |
614 | |
615 GrowableArray<BasicBlock*>* save_predecessors = _normal_predecessors; | |
616 | |
617 assert (start < split_bci && split_bci < limit, "improper split"); | |
618 | |
619 // Make a new block to cover the first half of the range. | |
620 BasicBlock *first_half = new (_analyzer->arena()) BasicBlock(_analyzer, start, split_bci); | |
621 | |
622 // Assign correct values to the second half (this) | |
623 _normal_predecessors = first_half->_normal_predecessors; | |
624 _start_bci = split_bci; | |
625 add_normal_predecessor(first_half); | |
626 | |
627 // Assign correct predecessors to the new first half | |
628 first_half->_normal_predecessors = save_predecessors; | |
629 | |
630 return first_half; | |
631 } | |
632 | |
633 void MethodLiveness::BasicBlock::compute_gen_kill(ciMethod* method) { | |
634 ciBytecodeStream bytes(method); | |
635 bytes.reset_to_bci(start_bci()); | |
636 bytes.set_max_bci(limit_bci()); | |
637 compute_gen_kill_range(&bytes); | |
638 | |
639 } | |
640 | |
641 void MethodLiveness::BasicBlock::compute_gen_kill_range(ciBytecodeStream *bytes) { | |
642 _gen.clear(); | |
643 _kill.clear(); | |
644 | |
645 while (bytes->next() != ciBytecodeStream::EOBC()) { | |
646 compute_gen_kill_single(bytes); | |
647 } | |
648 } | |
649 | |
650 void MethodLiveness::BasicBlock::compute_gen_kill_single(ciBytecodeStream *instruction) { | |
651 int localNum; | |
652 | |
653 // We prohibit _gen and _kill from having locals in common. If we | |
654 // know that one is definitely going to be applied before the other, | |
655 // we could save some computation time by relaxing this prohibition. | |
656 | |
657 switch (instruction->cur_bc()) { | |
658 case Bytecodes::_nop: | |
659 case Bytecodes::_goto: | |
660 case Bytecodes::_goto_w: | |
661 case Bytecodes::_aconst_null: | |
662 case Bytecodes::_new: | |
663 case Bytecodes::_iconst_m1: | |
664 case Bytecodes::_iconst_0: | |
665 case Bytecodes::_iconst_1: | |
666 case Bytecodes::_iconst_2: | |
667 case Bytecodes::_iconst_3: | |
668 case Bytecodes::_iconst_4: | |
669 case Bytecodes::_iconst_5: | |
670 case Bytecodes::_fconst_0: | |
671 case Bytecodes::_fconst_1: | |
672 case Bytecodes::_fconst_2: | |
673 case Bytecodes::_bipush: | |
674 case Bytecodes::_sipush: | |
675 case Bytecodes::_lconst_0: | |
676 case Bytecodes::_lconst_1: | |
677 case Bytecodes::_dconst_0: | |
678 case Bytecodes::_dconst_1: | |
679 case Bytecodes::_ldc2_w: | |
680 case Bytecodes::_ldc: | |
681 case Bytecodes::_ldc_w: | |
682 case Bytecodes::_iaload: | |
683 case Bytecodes::_faload: | |
684 case Bytecodes::_baload: | |
685 case Bytecodes::_caload: | |
686 case Bytecodes::_saload: | |
687 case Bytecodes::_laload: | |
688 case Bytecodes::_daload: | |
689 case Bytecodes::_aaload: | |
690 case Bytecodes::_iastore: | |
691 case Bytecodes::_fastore: | |
692 case Bytecodes::_bastore: | |
693 case Bytecodes::_castore: | |
694 case Bytecodes::_sastore: | |
695 case Bytecodes::_lastore: | |
696 case Bytecodes::_dastore: | |
697 case Bytecodes::_aastore: | |
698 case Bytecodes::_pop: | |
699 case Bytecodes::_pop2: | |
700 case Bytecodes::_dup: | |
701 case Bytecodes::_dup_x1: | |
702 case Bytecodes::_dup_x2: | |
703 case Bytecodes::_dup2: | |
704 case Bytecodes::_dup2_x1: | |
705 case Bytecodes::_dup2_x2: | |
706 case Bytecodes::_swap: | |
707 case Bytecodes::_iadd: | |
708 case Bytecodes::_fadd: | |
709 case Bytecodes::_isub: | |
710 case Bytecodes::_fsub: | |
711 case Bytecodes::_imul: | |
712 case Bytecodes::_fmul: | |
713 case Bytecodes::_idiv: | |
714 case Bytecodes::_fdiv: | |
715 case Bytecodes::_irem: | |
716 case Bytecodes::_frem: | |
717 case Bytecodes::_ishl: | |
718 case Bytecodes::_ishr: | |
719 case Bytecodes::_iushr: | |
720 case Bytecodes::_iand: | |
721 case Bytecodes::_ior: | |
722 case Bytecodes::_ixor: | |
723 case Bytecodes::_l2f: | |
724 case Bytecodes::_l2i: | |
725 case Bytecodes::_d2f: | |
726 case Bytecodes::_d2i: | |
727 case Bytecodes::_fcmpl: | |
728 case Bytecodes::_fcmpg: | |
729 case Bytecodes::_ladd: | |
730 case Bytecodes::_dadd: | |
731 case Bytecodes::_lsub: | |
732 case Bytecodes::_dsub: | |
733 case Bytecodes::_lmul: | |
734 case Bytecodes::_dmul: | |
735 case Bytecodes::_ldiv: | |
736 case Bytecodes::_ddiv: | |
737 case Bytecodes::_lrem: | |
738 case Bytecodes::_drem: | |
739 case Bytecodes::_land: | |
740 case Bytecodes::_lor: | |
741 case Bytecodes::_lxor: | |
742 case Bytecodes::_ineg: | |
743 case Bytecodes::_fneg: | |
744 case Bytecodes::_i2f: | |
745 case Bytecodes::_f2i: | |
746 case Bytecodes::_i2c: | |
747 case Bytecodes::_i2s: | |
748 case Bytecodes::_i2b: | |
749 case Bytecodes::_lneg: | |
750 case Bytecodes::_dneg: | |
751 case Bytecodes::_l2d: | |
752 case Bytecodes::_d2l: | |
753 case Bytecodes::_lshl: | |
754 case Bytecodes::_lshr: | |
755 case Bytecodes::_lushr: | |
756 case Bytecodes::_i2l: | |
757 case Bytecodes::_i2d: | |
758 case Bytecodes::_f2l: | |
759 case Bytecodes::_f2d: | |
760 case Bytecodes::_lcmp: | |
761 case Bytecodes::_dcmpl: | |
762 case Bytecodes::_dcmpg: | |
763 case Bytecodes::_ifeq: | |
764 case Bytecodes::_ifne: | |
765 case Bytecodes::_iflt: | |
766 case Bytecodes::_ifge: | |
767 case Bytecodes::_ifgt: | |
768 case Bytecodes::_ifle: | |
769 case Bytecodes::_tableswitch: | |
770 case Bytecodes::_ireturn: | |
771 case Bytecodes::_freturn: | |
772 case Bytecodes::_if_icmpeq: | |
773 case Bytecodes::_if_icmpne: | |
774 case Bytecodes::_if_icmplt: | |
775 case Bytecodes::_if_icmpge: | |
776 case Bytecodes::_if_icmpgt: | |
777 case Bytecodes::_if_icmple: | |
778 case Bytecodes::_lreturn: | |
779 case Bytecodes::_dreturn: | |
780 case Bytecodes::_if_acmpeq: | |
781 case Bytecodes::_if_acmpne: | |
782 case Bytecodes::_jsr: | |
783 case Bytecodes::_jsr_w: | |
784 case Bytecodes::_getstatic: | |
785 case Bytecodes::_putstatic: | |
786 case Bytecodes::_getfield: | |
787 case Bytecodes::_putfield: | |
788 case Bytecodes::_invokevirtual: | |
789 case Bytecodes::_invokespecial: | |
790 case Bytecodes::_invokestatic: | |
791 case Bytecodes::_invokeinterface: | |
1135
e66fd840cb6b
6893081: method handle & invokedynamic code needs additional cleanup (post 6815692, 6858164)
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parents:
342
diff
changeset
|
792 case Bytecodes::_invokedynamic: |
0 | 793 case Bytecodes::_newarray: |
794 case Bytecodes::_anewarray: | |
795 case Bytecodes::_checkcast: | |
796 case Bytecodes::_arraylength: | |
797 case Bytecodes::_instanceof: | |
798 case Bytecodes::_athrow: | |
799 case Bytecodes::_areturn: | |
800 case Bytecodes::_monitorenter: | |
801 case Bytecodes::_monitorexit: | |
802 case Bytecodes::_ifnull: | |
803 case Bytecodes::_ifnonnull: | |
804 case Bytecodes::_multianewarray: | |
805 case Bytecodes::_lookupswitch: | |
806 // These bytecodes have no effect on the method's locals. | |
807 break; | |
808 | |
809 case Bytecodes::_return: | |
810 if (instruction->method()->intrinsic_id() == vmIntrinsics::_Object_init) { | |
811 // return from Object.init implicitly registers a finalizer | |
812 // for the receiver if needed, so keep it alive. | |
813 load_one(0); | |
814 } | |
815 break; | |
816 | |
817 | |
818 case Bytecodes::_lload: | |
819 case Bytecodes::_dload: | |
820 load_two(instruction->get_index()); | |
821 break; | |
822 | |
823 case Bytecodes::_lload_0: | |
824 case Bytecodes::_dload_0: | |
825 load_two(0); | |
826 break; | |
827 | |
828 case Bytecodes::_lload_1: | |
829 case Bytecodes::_dload_1: | |
830 load_two(1); | |
831 break; | |
832 | |
833 case Bytecodes::_lload_2: | |
834 case Bytecodes::_dload_2: | |
835 load_two(2); | |
836 break; | |
837 | |
838 case Bytecodes::_lload_3: | |
839 case Bytecodes::_dload_3: | |
840 load_two(3); | |
841 break; | |
842 | |
843 case Bytecodes::_iload: | |
844 case Bytecodes::_iinc: | |
845 case Bytecodes::_fload: | |
846 case Bytecodes::_aload: | |
847 case Bytecodes::_ret: | |
848 load_one(instruction->get_index()); | |
849 break; | |
850 | |
851 case Bytecodes::_iload_0: | |
852 case Bytecodes::_fload_0: | |
853 case Bytecodes::_aload_0: | |
854 load_one(0); | |
855 break; | |
856 | |
857 case Bytecodes::_iload_1: | |
858 case Bytecodes::_fload_1: | |
859 case Bytecodes::_aload_1: | |
860 load_one(1); | |
861 break; | |
862 | |
863 case Bytecodes::_iload_2: | |
864 case Bytecodes::_fload_2: | |
865 case Bytecodes::_aload_2: | |
866 load_one(2); | |
867 break; | |
868 | |
869 case Bytecodes::_iload_3: | |
870 case Bytecodes::_fload_3: | |
871 case Bytecodes::_aload_3: | |
872 load_one(3); | |
873 break; | |
874 | |
875 case Bytecodes::_lstore: | |
876 case Bytecodes::_dstore: | |
877 store_two(localNum = instruction->get_index()); | |
878 break; | |
879 | |
880 case Bytecodes::_lstore_0: | |
881 case Bytecodes::_dstore_0: | |
882 store_two(0); | |
883 break; | |
884 | |
885 case Bytecodes::_lstore_1: | |
886 case Bytecodes::_dstore_1: | |
887 store_two(1); | |
888 break; | |
889 | |
890 case Bytecodes::_lstore_2: | |
891 case Bytecodes::_dstore_2: | |
892 store_two(2); | |
893 break; | |
894 | |
895 case Bytecodes::_lstore_3: | |
896 case Bytecodes::_dstore_3: | |
897 store_two(3); | |
898 break; | |
899 | |
900 case Bytecodes::_istore: | |
901 case Bytecodes::_fstore: | |
902 case Bytecodes::_astore: | |
903 store_one(instruction->get_index()); | |
904 break; | |
905 | |
906 case Bytecodes::_istore_0: | |
907 case Bytecodes::_fstore_0: | |
908 case Bytecodes::_astore_0: | |
909 store_one(0); | |
910 break; | |
911 | |
912 case Bytecodes::_istore_1: | |
913 case Bytecodes::_fstore_1: | |
914 case Bytecodes::_astore_1: | |
915 store_one(1); | |
916 break; | |
917 | |
918 case Bytecodes::_istore_2: | |
919 case Bytecodes::_fstore_2: | |
920 case Bytecodes::_astore_2: | |
921 store_one(2); | |
922 break; | |
923 | |
924 case Bytecodes::_istore_3: | |
925 case Bytecodes::_fstore_3: | |
926 case Bytecodes::_astore_3: | |
927 store_one(3); | |
928 break; | |
929 | |
930 case Bytecodes::_wide: | |
931 fatal("Iterator should skip this bytecode"); | |
932 break; | |
933 | |
934 default: | |
935 tty->print("unexpected opcode: %d\n", instruction->cur_bc()); | |
936 ShouldNotReachHere(); | |
937 break; | |
938 } | |
939 } | |
940 | |
941 void MethodLiveness::BasicBlock::load_two(int local) { | |
942 load_one(local); | |
943 load_one(local+1); | |
944 } | |
945 | |
946 void MethodLiveness::BasicBlock::load_one(int local) { | |
947 if (!_kill.at(local)) { | |
948 _gen.at_put(local, true); | |
949 } | |
950 } | |
951 | |
952 void MethodLiveness::BasicBlock::store_two(int local) { | |
953 store_one(local); | |
954 store_one(local+1); | |
955 } | |
956 | |
957 void MethodLiveness::BasicBlock::store_one(int local) { | |
958 if (!_gen.at(local)) { | |
959 _kill.at_put(local, true); | |
960 } | |
961 } | |
962 | |
963 void MethodLiveness::BasicBlock::propagate(MethodLiveness *ml) { | |
964 // These set operations could be combined for efficiency if the | |
965 // performance of this analysis becomes an issue. | |
966 _entry.set_union(_normal_exit); | |
967 _entry.set_difference(_kill); | |
968 _entry.set_union(_gen); | |
969 | |
970 // Note that we merge information from our exceptional successors | |
971 // just once, rather than at individual bytecodes. | |
972 _entry.set_union(_exception_exit); | |
973 | |
974 if (TraceLivenessGen) { | |
975 tty->print_cr(" ** Visiting block at %d **", start_bci()); | |
976 print_on(tty); | |
977 } | |
978 | |
979 int i; | |
980 for (i=_normal_predecessors->length()-1; i>=0; i--) { | |
981 BasicBlock *block = _normal_predecessors->at(i); | |
982 if (block->merge_normal(_entry)) { | |
983 ml->work_list_add(block); | |
984 } | |
985 } | |
986 for (i=_exception_predecessors->length()-1; i>=0; i--) { | |
987 BasicBlock *block = _exception_predecessors->at(i); | |
988 if (block->merge_exception(_entry)) { | |
989 ml->work_list_add(block); | |
990 } | |
991 } | |
992 } | |
993 | |
994 bool MethodLiveness::BasicBlock::merge_normal(BitMap other) { | |
995 return _normal_exit.set_union_with_result(other); | |
996 } | |
997 | |
998 bool MethodLiveness::BasicBlock::merge_exception(BitMap other) { | |
999 return _exception_exit.set_union_with_result(other); | |
1000 } | |
1001 | |
1002 MethodLivenessResult MethodLiveness::BasicBlock::get_liveness_at(ciMethod* method, int bci) { | |
1003 MethodLivenessResult answer(NEW_RESOURCE_ARRAY(uintptr_t, _analyzer->bit_map_size_words()), | |
1004 _analyzer->bit_map_size_bits()); | |
1005 answer.set_is_valid(); | |
1006 | |
1007 #ifndef ASSERT | |
1008 if (bci == start_bci()) { | |
1009 answer.set_from(_entry); | |
1010 return answer; | |
1011 } | |
1012 #endif | |
1013 | |
1014 #ifdef ASSERT | |
1015 ResourceMark rm; | |
1016 BitMap g(_gen.size()); g.set_from(_gen); | |
1017 BitMap k(_kill.size()); k.set_from(_kill); | |
1018 #endif | |
1019 if (_last_bci != bci || trueInDebug) { | |
1020 ciBytecodeStream bytes(method); | |
1021 bytes.reset_to_bci(bci); | |
1022 bytes.set_max_bci(limit_bci()); | |
1023 compute_gen_kill_range(&bytes); | |
1024 assert(_last_bci != bci || | |
1025 (g.is_same(_gen) && k.is_same(_kill)), "cached computation is incorrect"); | |
1026 _last_bci = bci; | |
1027 } | |
1028 | |
1029 answer.clear(); | |
1030 answer.set_union(_normal_exit); | |
1031 answer.set_difference(_kill); | |
1032 answer.set_union(_gen); | |
1033 answer.set_union(_exception_exit); | |
1034 | |
1035 #ifdef ASSERT | |
1036 if (bci == start_bci()) { | |
1037 assert(answer.is_same(_entry), "optimized answer must be accurate"); | |
1038 } | |
1039 #endif | |
1040 | |
1041 return answer; | |
1042 } | |
1043 | |
1044 #ifndef PRODUCT | |
1045 | |
1046 void MethodLiveness::BasicBlock::print_on(outputStream *os) const { | |
1047 os->print_cr("==================================================================="); | |
1048 os->print_cr(" Block start: %4d, limit: %4d", _start_bci, _limit_bci); | |
1049 os->print (" Normal predecessors (%2d) @", _normal_predecessors->length()); | |
1050 int i; | |
1051 for (i=0; i < _normal_predecessors->length(); i++) { | |
1052 os->print(" %4d", _normal_predecessors->at(i)->start_bci()); | |
1053 } | |
1054 os->cr(); | |
1055 os->print (" Exceptional predecessors (%2d) @", _exception_predecessors->length()); | |
1056 for (i=0; i < _exception_predecessors->length(); i++) { | |
1057 os->print(" %4d", _exception_predecessors->at(i)->start_bci()); | |
1058 } | |
1059 os->cr(); | |
1060 os->print (" Normal Exit : "); | |
1061 _normal_exit.print_on(os); | |
1062 os->print (" Gen : "); | |
1063 _gen.print_on(os); | |
1064 os->print (" Kill : "); | |
1065 _kill.print_on(os); | |
1066 os->print (" Exception Exit: "); | |
1067 _exception_exit.print_on(os); | |
1068 os->print (" Entry : "); | |
1069 _entry.print_on(os); | |
1070 } | |
1071 | |
1072 #endif // PRODUCT |