Mercurial > hg > truffle
annotate src/share/vm/ci/ciTypeFlow.cpp @ 6292:b679a28208fd
disabled failing BigBangTests: helloWorldTest, formattedOutputTest, arrayListTestWithCalls
made BigBangTest less verbose unless "BigBang.verbose" system property is set to "true"
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 28 Aug 2012 11:43:06 +0200 |
parents | 1d7922586cf6 |
children | 7f813940ac35 |
rev | line source |
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0 | 1 /* |
2142 | 2 * Copyright (c) 2000, 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 "ci/ciConstant.hpp" | |
27 #include "ci/ciField.hpp" | |
28 #include "ci/ciMethod.hpp" | |
29 #include "ci/ciMethodData.hpp" | |
30 #include "ci/ciObjArrayKlass.hpp" | |
31 #include "ci/ciStreams.hpp" | |
32 #include "ci/ciTypeArrayKlass.hpp" | |
33 #include "ci/ciTypeFlow.hpp" | |
34 #include "compiler/compileLog.hpp" | |
35 #include "interpreter/bytecode.hpp" | |
36 #include "interpreter/bytecodes.hpp" | |
37 #include "memory/allocation.inline.hpp" | |
38 #include "runtime/deoptimization.hpp" | |
39 #include "utilities/growableArray.hpp" | |
0 | 40 |
41 // ciTypeFlow::JsrSet | |
42 // | |
43 // A JsrSet represents some set of JsrRecords. This class | |
44 // is used to record a set of all jsr routines which we permit | |
45 // execution to return (ret) from. | |
46 // | |
47 // During abstract interpretation, JsrSets are used to determine | |
48 // whether two paths which reach a given block are unique, and | |
49 // should be cloned apart, or are compatible, and should merge | |
50 // together. | |
51 | |
52 // ------------------------------------------------------------------ | |
53 // ciTypeFlow::JsrSet::JsrSet | |
54 ciTypeFlow::JsrSet::JsrSet(Arena* arena, int default_len) { | |
55 if (arena != NULL) { | |
56 // Allocate growable array in Arena. | |
57 _set = new (arena) GrowableArray<JsrRecord*>(arena, default_len, 0, NULL); | |
58 } else { | |
59 // Allocate growable array in current ResourceArea. | |
60 _set = new GrowableArray<JsrRecord*>(4, 0, NULL, false); | |
61 } | |
62 } | |
63 | |
64 // ------------------------------------------------------------------ | |
65 // ciTypeFlow::JsrSet::copy_into | |
66 void ciTypeFlow::JsrSet::copy_into(JsrSet* jsrs) { | |
67 int len = size(); | |
68 jsrs->_set->clear(); | |
69 for (int i = 0; i < len; i++) { | |
70 jsrs->_set->append(_set->at(i)); | |
71 } | |
72 } | |
73 | |
74 // ------------------------------------------------------------------ | |
75 // ciTypeFlow::JsrSet::is_compatible_with | |
76 // | |
77 // !!!! MISGIVINGS ABOUT THIS... disregard | |
78 // | |
79 // Is this JsrSet compatible with some other JsrSet? | |
80 // | |
81 // In set-theoretic terms, a JsrSet can be viewed as a partial function | |
82 // from entry addresses to return addresses. Two JsrSets A and B are | |
83 // compatible iff | |
84 // | |
85 // For any x, | |
86 // A(x) defined and B(x) defined implies A(x) == B(x) | |
87 // | |
88 // Less formally, two JsrSets are compatible when they have identical | |
89 // return addresses for any entry addresses they share in common. | |
90 bool ciTypeFlow::JsrSet::is_compatible_with(JsrSet* other) { | |
91 // Walk through both sets in parallel. If the same entry address | |
92 // appears in both sets, then the return address must match for | |
93 // the sets to be compatible. | |
94 int size1 = size(); | |
95 int size2 = other->size(); | |
96 | |
97 // Special case. If nothing is on the jsr stack, then there can | |
98 // be no ret. | |
99 if (size2 == 0) { | |
100 return true; | |
101 } else if (size1 != size2) { | |
102 return false; | |
103 } else { | |
104 for (int i = 0; i < size1; i++) { | |
105 JsrRecord* record1 = record_at(i); | |
106 JsrRecord* record2 = other->record_at(i); | |
107 if (record1->entry_address() != record2->entry_address() || | |
108 record1->return_address() != record2->return_address()) { | |
109 return false; | |
110 } | |
111 } | |
112 return true; | |
113 } | |
114 | |
115 #if 0 | |
116 int pos1 = 0; | |
117 int pos2 = 0; | |
118 int size1 = size(); | |
119 int size2 = other->size(); | |
120 while (pos1 < size1 && pos2 < size2) { | |
121 JsrRecord* record1 = record_at(pos1); | |
122 JsrRecord* record2 = other->record_at(pos2); | |
123 int entry1 = record1->entry_address(); | |
124 int entry2 = record2->entry_address(); | |
125 if (entry1 < entry2) { | |
126 pos1++; | |
127 } else if (entry1 > entry2) { | |
128 pos2++; | |
129 } else { | |
130 if (record1->return_address() == record2->return_address()) { | |
131 pos1++; | |
132 pos2++; | |
133 } else { | |
134 // These two JsrSets are incompatible. | |
135 return false; | |
136 } | |
137 } | |
138 } | |
139 // The two JsrSets agree. | |
140 return true; | |
141 #endif | |
142 } | |
143 | |
144 // ------------------------------------------------------------------ | |
145 // ciTypeFlow::JsrSet::insert_jsr_record | |
146 // | |
147 // Insert the given JsrRecord into the JsrSet, maintaining the order | |
148 // of the set and replacing any element with the same entry address. | |
149 void ciTypeFlow::JsrSet::insert_jsr_record(JsrRecord* record) { | |
150 int len = size(); | |
151 int entry = record->entry_address(); | |
152 int pos = 0; | |
153 for ( ; pos < len; pos++) { | |
154 JsrRecord* current = record_at(pos); | |
155 if (entry == current->entry_address()) { | |
156 // Stomp over this entry. | |
157 _set->at_put(pos, record); | |
158 assert(size() == len, "must be same size"); | |
159 return; | |
160 } else if (entry < current->entry_address()) { | |
161 break; | |
162 } | |
163 } | |
164 | |
165 // Insert the record into the list. | |
166 JsrRecord* swap = record; | |
167 JsrRecord* temp = NULL; | |
168 for ( ; pos < len; pos++) { | |
169 temp = _set->at(pos); | |
170 _set->at_put(pos, swap); | |
171 swap = temp; | |
172 } | |
173 _set->append(swap); | |
174 assert(size() == len+1, "must be larger"); | |
175 } | |
176 | |
177 // ------------------------------------------------------------------ | |
178 // ciTypeFlow::JsrSet::remove_jsr_record | |
179 // | |
180 // Remove the JsrRecord with the given return address from the JsrSet. | |
181 void ciTypeFlow::JsrSet::remove_jsr_record(int return_address) { | |
182 int len = size(); | |
183 for (int i = 0; i < len; i++) { | |
184 if (record_at(i)->return_address() == return_address) { | |
185 // We have found the proper entry. Remove it from the | |
186 // JsrSet and exit. | |
187 for (int j = i+1; j < len ; j++) { | |
188 _set->at_put(j-1, _set->at(j)); | |
189 } | |
190 _set->trunc_to(len-1); | |
191 assert(size() == len-1, "must be smaller"); | |
192 return; | |
193 } | |
194 } | |
195 assert(false, "verify: returning from invalid subroutine"); | |
196 } | |
197 | |
198 // ------------------------------------------------------------------ | |
199 // ciTypeFlow::JsrSet::apply_control | |
200 // | |
201 // Apply the effect of a control-flow bytecode on the JsrSet. The | |
202 // only bytecodes that modify the JsrSet are jsr and ret. | |
203 void ciTypeFlow::JsrSet::apply_control(ciTypeFlow* analyzer, | |
204 ciBytecodeStream* str, | |
205 ciTypeFlow::StateVector* state) { | |
206 Bytecodes::Code code = str->cur_bc(); | |
207 if (code == Bytecodes::_jsr) { | |
208 JsrRecord* record = | |
209 analyzer->make_jsr_record(str->get_dest(), str->next_bci()); | |
210 insert_jsr_record(record); | |
211 } else if (code == Bytecodes::_jsr_w) { | |
212 JsrRecord* record = | |
213 analyzer->make_jsr_record(str->get_far_dest(), str->next_bci()); | |
214 insert_jsr_record(record); | |
215 } else if (code == Bytecodes::_ret) { | |
216 Cell local = state->local(str->get_index()); | |
217 ciType* return_address = state->type_at(local); | |
218 assert(return_address->is_return_address(), "verify: wrong type"); | |
219 if (size() == 0) { | |
220 // Ret-state underflow: Hit a ret w/o any previous jsrs. Bail out. | |
221 // This can happen when a loop is inside a finally clause (4614060). | |
222 analyzer->record_failure("OSR in finally clause"); | |
223 return; | |
224 } | |
225 remove_jsr_record(return_address->as_return_address()->bci()); | |
226 } | |
227 } | |
228 | |
229 #ifndef PRODUCT | |
230 // ------------------------------------------------------------------ | |
231 // ciTypeFlow::JsrSet::print_on | |
232 void ciTypeFlow::JsrSet::print_on(outputStream* st) const { | |
233 st->print("{ "); | |
234 int num_elements = size(); | |
235 if (num_elements > 0) { | |
236 int i = 0; | |
237 for( ; i < num_elements - 1; i++) { | |
238 _set->at(i)->print_on(st); | |
239 st->print(", "); | |
240 } | |
241 _set->at(i)->print_on(st); | |
242 st->print(" "); | |
243 } | |
244 st->print("}"); | |
245 } | |
246 #endif | |
247 | |
248 // ciTypeFlow::StateVector | |
249 // | |
250 // A StateVector summarizes the type information at some point in | |
251 // the program. | |
252 | |
253 // ------------------------------------------------------------------ | |
254 // ciTypeFlow::StateVector::type_meet | |
255 // | |
256 // Meet two types. | |
257 // | |
258 // The semi-lattice of types use by this analysis are modeled on those | |
259 // of the verifier. The lattice is as follows: | |
260 // | |
261 // top_type() >= all non-extremal types >= bottom_type | |
262 // and | |
263 // Every primitive type is comparable only with itself. The meet of | |
264 // reference types is determined by their kind: instance class, | |
265 // interface, or array class. The meet of two types of the same | |
266 // kind is their least common ancestor. The meet of two types of | |
267 // different kinds is always java.lang.Object. | |
268 ciType* ciTypeFlow::StateVector::type_meet_internal(ciType* t1, ciType* t2, ciTypeFlow* analyzer) { | |
269 assert(t1 != t2, "checked in caller"); | |
270 if (t1->equals(top_type())) { | |
271 return t2; | |
272 } else if (t2->equals(top_type())) { | |
273 return t1; | |
274 } else if (t1->is_primitive_type() || t2->is_primitive_type()) { | |
275 // Special case null_type. null_type meet any reference type T | |
276 // is T. null_type meet null_type is null_type. | |
277 if (t1->equals(null_type())) { | |
278 if (!t2->is_primitive_type() || t2->equals(null_type())) { | |
279 return t2; | |
280 } | |
281 } else if (t2->equals(null_type())) { | |
282 if (!t1->is_primitive_type()) { | |
283 return t1; | |
284 } | |
285 } | |
286 | |
287 // At least one of the two types is a non-top primitive type. | |
288 // The other type is not equal to it. Fall to bottom. | |
289 return bottom_type(); | |
290 } else { | |
291 // Both types are non-top non-primitive types. That is, | |
292 // both types are either instanceKlasses or arrayKlasses. | |
293 ciKlass* object_klass = analyzer->env()->Object_klass(); | |
294 ciKlass* k1 = t1->as_klass(); | |
295 ciKlass* k2 = t2->as_klass(); | |
296 if (k1->equals(object_klass) || k2->equals(object_klass)) { | |
297 return object_klass; | |
298 } else if (!k1->is_loaded() || !k2->is_loaded()) { | |
299 // Unloaded classes fall to java.lang.Object at a merge. | |
300 return object_klass; | |
301 } else if (k1->is_interface() != k2->is_interface()) { | |
302 // When an interface meets a non-interface, we get Object; | |
303 // This is what the verifier does. | |
304 return object_klass; | |
305 } else if (k1->is_array_klass() || k2->is_array_klass()) { | |
306 // When an array meets a non-array, we get Object. | |
307 // When objArray meets typeArray, we also get Object. | |
308 // And when typeArray meets different typeArray, we again get Object. | |
309 // But when objArray meets objArray, we look carefully at element types. | |
310 if (k1->is_obj_array_klass() && k2->is_obj_array_klass()) { | |
311 // Meet the element types, then construct the corresponding array type. | |
312 ciKlass* elem1 = k1->as_obj_array_klass()->element_klass(); | |
313 ciKlass* elem2 = k2->as_obj_array_klass()->element_klass(); | |
314 ciKlass* elem = type_meet_internal(elem1, elem2, analyzer)->as_klass(); | |
315 // Do an easy shortcut if one type is a super of the other. | |
316 if (elem == elem1) { | |
317 assert(k1 == ciObjArrayKlass::make(elem), "shortcut is OK"); | |
318 return k1; | |
319 } else if (elem == elem2) { | |
320 assert(k2 == ciObjArrayKlass::make(elem), "shortcut is OK"); | |
321 return k2; | |
322 } else { | |
323 return ciObjArrayKlass::make(elem); | |
324 } | |
325 } else { | |
326 return object_klass; | |
327 } | |
328 } else { | |
329 // Must be two plain old instance klasses. | |
330 assert(k1->is_instance_klass(), "previous cases handle non-instances"); | |
331 assert(k2->is_instance_klass(), "previous cases handle non-instances"); | |
332 return k1->least_common_ancestor(k2); | |
333 } | |
334 } | |
335 } | |
336 | |
337 | |
338 // ------------------------------------------------------------------ | |
339 // ciTypeFlow::StateVector::StateVector | |
340 // | |
341 // Build a new state vector | |
342 ciTypeFlow::StateVector::StateVector(ciTypeFlow* analyzer) { | |
343 _outer = analyzer; | |
344 _stack_size = -1; | |
345 _monitor_count = -1; | |
346 // Allocate the _types array | |
347 int max_cells = analyzer->max_cells(); | |
348 _types = (ciType**)analyzer->arena()->Amalloc(sizeof(ciType*) * max_cells); | |
349 for (int i=0; i<max_cells; i++) { | |
350 _types[i] = top_type(); | |
351 } | |
352 _trap_bci = -1; | |
353 _trap_index = 0; | |
367
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354 _def_locals.clear(); |
0 | 355 } |
356 | |
367
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357 |
0 | 358 // ------------------------------------------------------------------ |
359 // ciTypeFlow::get_start_state | |
360 // | |
361 // Set this vector to the method entry state. | |
362 const ciTypeFlow::StateVector* ciTypeFlow::get_start_state() { | |
363 StateVector* state = new StateVector(this); | |
364 if (is_osr_flow()) { | |
365 ciTypeFlow* non_osr_flow = method()->get_flow_analysis(); | |
366 if (non_osr_flow->failing()) { | |
367 record_failure(non_osr_flow->failure_reason()); | |
368 return NULL; | |
369 } | |
370 JsrSet* jsrs = new JsrSet(NULL, 16); | |
371 Block* non_osr_block = non_osr_flow->existing_block_at(start_bci(), jsrs); | |
372 if (non_osr_block == NULL) { | |
373 record_failure("cannot reach OSR point"); | |
374 return NULL; | |
375 } | |
376 // load up the non-OSR state at this point | |
377 non_osr_block->copy_state_into(state); | |
378 int non_osr_start = non_osr_block->start(); | |
379 if (non_osr_start != start_bci()) { | |
380 // must flow forward from it | |
381 if (CITraceTypeFlow) { | |
382 tty->print_cr(">> Interpreting pre-OSR block %d:", non_osr_start); | |
383 } | |
384 Block* block = block_at(non_osr_start, jsrs); | |
385 assert(block->limit() == start_bci(), "must flow forward to start"); | |
386 flow_block(block, state, jsrs); | |
387 } | |
388 return state; | |
389 // Note: The code below would be an incorrect for an OSR flow, | |
390 // even if it were possible for an OSR entry point to be at bci zero. | |
391 } | |
392 // "Push" the method signature into the first few locals. | |
393 state->set_stack_size(-max_locals()); | |
394 if (!method()->is_static()) { | |
395 state->push(method()->holder()); | |
396 assert(state->tos() == state->local(0), ""); | |
397 } | |
398 for (ciSignatureStream str(method()->signature()); | |
399 !str.at_return_type(); | |
400 str.next()) { | |
401 state->push_translate(str.type()); | |
402 } | |
403 // Set the rest of the locals to bottom. | |
404 Cell cell = state->next_cell(state->tos()); | |
405 state->set_stack_size(0); | |
406 int limit = state->limit_cell(); | |
407 for (; cell < limit; cell = state->next_cell(cell)) { | |
408 state->set_type_at(cell, state->bottom_type()); | |
409 } | |
410 // Lock an object, if necessary. | |
411 state->set_monitor_count(method()->is_synchronized() ? 1 : 0); | |
412 return state; | |
413 } | |
414 | |
415 // ------------------------------------------------------------------ | |
416 // ciTypeFlow::StateVector::copy_into | |
417 // | |
418 // Copy our value into some other StateVector | |
419 void ciTypeFlow::StateVector::copy_into(ciTypeFlow::StateVector* copy) | |
420 const { | |
421 copy->set_stack_size(stack_size()); | |
422 copy->set_monitor_count(monitor_count()); | |
423 Cell limit = limit_cell(); | |
424 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
425 copy->set_type_at(c, type_at(c)); | |
426 } | |
427 } | |
428 | |
429 // ------------------------------------------------------------------ | |
430 // ciTypeFlow::StateVector::meet | |
431 // | |
432 // Meets this StateVector with another, destructively modifying this | |
433 // one. Returns true if any modification takes place. | |
434 bool ciTypeFlow::StateVector::meet(const ciTypeFlow::StateVector* incoming) { | |
435 if (monitor_count() == -1) { | |
436 set_monitor_count(incoming->monitor_count()); | |
437 } | |
438 assert(monitor_count() == incoming->monitor_count(), "monitors must match"); | |
439 | |
440 if (stack_size() == -1) { | |
441 set_stack_size(incoming->stack_size()); | |
442 Cell limit = limit_cell(); | |
443 #ifdef ASSERT | |
444 { for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
445 assert(type_at(c) == top_type(), ""); | |
446 } } | |
447 #endif | |
448 // Make a simple copy of the incoming state. | |
449 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
450 set_type_at(c, incoming->type_at(c)); | |
451 } | |
452 return true; // it is always different the first time | |
453 } | |
454 #ifdef ASSERT | |
455 if (stack_size() != incoming->stack_size()) { | |
456 _outer->method()->print_codes(); | |
457 tty->print_cr("!!!! Stack size conflict"); | |
458 tty->print_cr("Current state:"); | |
459 print_on(tty); | |
460 tty->print_cr("Incoming state:"); | |
461 ((StateVector*)incoming)->print_on(tty); | |
462 } | |
463 #endif | |
464 assert(stack_size() == incoming->stack_size(), "sanity"); | |
465 | |
466 bool different = false; | |
467 Cell limit = limit_cell(); | |
468 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
469 ciType* t1 = type_at(c); | |
470 ciType* t2 = incoming->type_at(c); | |
471 if (!t1->equals(t2)) { | |
472 ciType* new_type = type_meet(t1, t2); | |
473 if (!t1->equals(new_type)) { | |
474 set_type_at(c, new_type); | |
475 different = true; | |
476 } | |
477 } | |
478 } | |
479 return different; | |
480 } | |
481 | |
482 // ------------------------------------------------------------------ | |
483 // ciTypeFlow::StateVector::meet_exception | |
484 // | |
485 // Meets this StateVector with another, destructively modifying this | |
486 // one. The incoming state is coming via an exception. Returns true | |
487 // if any modification takes place. | |
488 bool ciTypeFlow::StateVector::meet_exception(ciInstanceKlass* exc, | |
489 const ciTypeFlow::StateVector* incoming) { | |
490 if (monitor_count() == -1) { | |
491 set_monitor_count(incoming->monitor_count()); | |
492 } | |
493 assert(monitor_count() == incoming->monitor_count(), "monitors must match"); | |
494 | |
495 if (stack_size() == -1) { | |
496 set_stack_size(1); | |
497 } | |
498 | |
499 assert(stack_size() == 1, "must have one-element stack"); | |
500 | |
501 bool different = false; | |
502 | |
503 // Meet locals from incoming array. | |
504 Cell limit = local(_outer->max_locals()-1); | |
505 for (Cell c = start_cell(); c <= limit; c = next_cell(c)) { | |
506 ciType* t1 = type_at(c); | |
507 ciType* t2 = incoming->type_at(c); | |
508 if (!t1->equals(t2)) { | |
509 ciType* new_type = type_meet(t1, t2); | |
510 if (!t1->equals(new_type)) { | |
511 set_type_at(c, new_type); | |
512 different = true; | |
513 } | |
514 } | |
515 } | |
516 | |
517 // Handle stack separately. When an exception occurs, the | |
518 // only stack entry is the exception instance. | |
519 ciType* tos_type = type_at_tos(); | |
520 if (!tos_type->equals(exc)) { | |
521 ciType* new_type = type_meet(tos_type, exc); | |
522 if (!tos_type->equals(new_type)) { | |
523 set_type_at_tos(new_type); | |
524 different = true; | |
525 } | |
526 } | |
527 | |
528 return different; | |
529 } | |
530 | |
531 // ------------------------------------------------------------------ | |
532 // ciTypeFlow::StateVector::push_translate | |
533 void ciTypeFlow::StateVector::push_translate(ciType* type) { | |
534 BasicType basic_type = type->basic_type(); | |
535 if (basic_type == T_BOOLEAN || basic_type == T_CHAR || | |
536 basic_type == T_BYTE || basic_type == T_SHORT) { | |
537 push_int(); | |
538 } else { | |
539 push(type); | |
540 if (type->is_two_word()) { | |
541 push(half_type(type)); | |
542 } | |
543 } | |
544 } | |
545 | |
546 // ------------------------------------------------------------------ | |
547 // ciTypeFlow::StateVector::do_aaload | |
548 void ciTypeFlow::StateVector::do_aaload(ciBytecodeStream* str) { | |
549 pop_int(); | |
550 ciObjArrayKlass* array_klass = pop_objArray(); | |
551 if (array_klass == NULL) { | |
552 // Did aaload on a null reference; push a null and ignore the exception. | |
553 // This instruction will never continue normally. All we have to do | |
554 // is report a value that will meet correctly with any downstream | |
555 // reference types on paths that will truly be executed. This null type | |
556 // meets with any reference type to yield that same reference type. | |
605 | 557 // (The compiler will generate an unconditional exception here.) |
0 | 558 push(null_type()); |
559 return; | |
560 } | |
561 if (!array_klass->is_loaded()) { | |
562 // Only fails for some -Xcomp runs | |
563 trap(str, array_klass, | |
564 Deoptimization::make_trap_request | |
565 (Deoptimization::Reason_unloaded, | |
566 Deoptimization::Action_reinterpret)); | |
567 return; | |
568 } | |
569 ciKlass* element_klass = array_klass->element_klass(); | |
570 if (!element_klass->is_loaded() && element_klass->is_instance_klass()) { | |
571 Untested("unloaded array element class in ciTypeFlow"); | |
572 trap(str, element_klass, | |
573 Deoptimization::make_trap_request | |
574 (Deoptimization::Reason_unloaded, | |
575 Deoptimization::Action_reinterpret)); | |
576 } else { | |
577 push_object(element_klass); | |
578 } | |
579 } | |
580 | |
581 | |
582 // ------------------------------------------------------------------ | |
583 // ciTypeFlow::StateVector::do_checkcast | |
584 void ciTypeFlow::StateVector::do_checkcast(ciBytecodeStream* str) { | |
585 bool will_link; | |
586 ciKlass* klass = str->get_klass(will_link); | |
587 if (!will_link) { | |
588 // VM's interpreter will not load 'klass' if object is NULL. | |
589 // Type flow after this block may still be needed in two situations: | |
590 // 1) C2 uses do_null_assert() and continues compilation for later blocks | |
591 // 2) C2 does an OSR compile in a later block (see bug 4778368). | |
592 pop_object(); | |
593 do_null_assert(klass); | |
594 } else { | |
595 pop_object(); | |
596 push_object(klass); | |
597 } | |
598 } | |
599 | |
600 // ------------------------------------------------------------------ | |
601 // ciTypeFlow::StateVector::do_getfield | |
602 void ciTypeFlow::StateVector::do_getfield(ciBytecodeStream* str) { | |
603 // could add assert here for type of object. | |
604 pop_object(); | |
605 do_getstatic(str); | |
606 } | |
607 | |
608 // ------------------------------------------------------------------ | |
609 // ciTypeFlow::StateVector::do_getstatic | |
610 void ciTypeFlow::StateVector::do_getstatic(ciBytecodeStream* str) { | |
611 bool will_link; | |
612 ciField* field = str->get_field(will_link); | |
613 if (!will_link) { | |
614 trap(str, field->holder(), str->get_field_holder_index()); | |
615 } else { | |
616 ciType* field_type = field->type(); | |
617 if (!field_type->is_loaded()) { | |
618 // Normally, we need the field's type to be loaded if we are to | |
619 // do anything interesting with its value. | |
620 // We used to do this: trap(str, str->get_field_signature_index()); | |
621 // | |
622 // There is one good reason not to trap here. Execution can | |
623 // get past this "getfield" or "getstatic" if the value of | |
624 // the field is null. As long as the value is null, the class | |
625 // does not need to be loaded! The compiler must assume that | |
626 // the value of the unloaded class reference is null; if the code | |
627 // ever sees a non-null value, loading has occurred. | |
628 // | |
629 // This actually happens often enough to be annoying. If the | |
630 // compiler throws an uncommon trap at this bytecode, you can | |
631 // get an endless loop of recompilations, when all the code | |
632 // needs to do is load a series of null values. Also, a trap | |
633 // here can make an OSR entry point unreachable, triggering the | |
634 // assert on non_osr_block in ciTypeFlow::get_start_state. | |
635 // (See bug 4379915.) | |
636 do_null_assert(field_type->as_klass()); | |
637 } else { | |
638 push_translate(field_type); | |
639 } | |
640 } | |
641 } | |
642 | |
643 // ------------------------------------------------------------------ | |
644 // ciTypeFlow::StateVector::do_invoke | |
645 void ciTypeFlow::StateVector::do_invoke(ciBytecodeStream* str, | |
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646 bool has_receiver_foo) { |
0 | 647 bool will_link; |
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648 ciMethod* callee = str->get_method(will_link); |
0 | 649 if (!will_link) { |
650 // We weren't able to find the method. | |
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651 if (str->cur_bc() == Bytecodes::_invokedynamic) { |
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652 trap(str, NULL, |
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653 Deoptimization::make_trap_request |
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654 (Deoptimization::Reason_uninitialized, |
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655 Deoptimization::Action_reinterpret)); |
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656 } else { |
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657 ciKlass* unloaded_holder = callee->holder(); |
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658 trap(str, unloaded_holder, str->get_method_holder_index()); |
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659 } |
0 | 660 } else { |
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661 // TODO Use Bytecode_invoke after metadata changes. |
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662 //Bytecode_invoke inv(str->method(), str->cur_bci()); |
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663 //const bool has_receiver = callee->is_loaded() ? !callee->is_static() : inv.has_receiver(); |
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664 Bytecode inv(str); |
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665 Bytecodes::Code code = inv.invoke_code(); |
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666 const bool has_receiver = callee->is_loaded() ? !callee->is_static() : code != Bytecodes::_invokestatic && code != Bytecodes::_invokedynamic; |
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667 |
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668 ciSignature* signature = callee->signature(); |
0 | 669 ciSignatureStream sigstr(signature); |
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670 // Push appendix argument, if one. |
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671 if (str->has_appendix()) { |
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672 ciObject* appendix = str->get_appendix(); |
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673 push_object(appendix->klass()); |
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674 } |
0 | 675 int arg_size = signature->size(); |
676 int stack_base = stack_size() - arg_size; | |
677 int i = 0; | |
678 for( ; !sigstr.at_return_type(); sigstr.next()) { | |
679 ciType* type = sigstr.type(); | |
680 ciType* stack_type = type_at(stack(stack_base + i++)); | |
681 // Do I want to check this type? | |
682 // assert(stack_type->is_subtype_of(type), "bad type for field value"); | |
683 if (type->is_two_word()) { | |
684 ciType* stack_type2 = type_at(stack(stack_base + i++)); | |
685 assert(stack_type2->equals(half_type(type)), "must be 2nd half"); | |
686 } | |
687 } | |
688 assert(arg_size == i, "must match"); | |
689 for (int j = 0; j < arg_size; j++) { | |
690 pop(); | |
691 } | |
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692 assert(!callee->is_loaded() || has_receiver == !callee->is_static(), "mismatch"); |
0 | 693 if (has_receiver) { |
694 // Check this? | |
695 pop_object(); | |
696 } | |
697 assert(!sigstr.is_done(), "must have return type"); | |
698 ciType* return_type = sigstr.type(); | |
699 if (!return_type->is_void()) { | |
700 if (!return_type->is_loaded()) { | |
701 // As in do_getstatic(), generally speaking, we need the return type to | |
702 // be loaded if we are to do anything interesting with its value. | |
703 // We used to do this: trap(str, str->get_method_signature_index()); | |
704 // | |
705 // We do not trap here since execution can get past this invoke if | |
706 // the return value is null. As long as the value is null, the class | |
707 // does not need to be loaded! The compiler must assume that | |
708 // the value of the unloaded class reference is null; if the code | |
709 // ever sees a non-null value, loading has occurred. | |
710 // | |
711 // See do_getstatic() for similar explanation, as well as bug 4684993. | |
712 do_null_assert(return_type->as_klass()); | |
713 } else { | |
714 push_translate(return_type); | |
715 } | |
716 } | |
717 } | |
718 } | |
719 | |
720 // ------------------------------------------------------------------ | |
721 // ciTypeFlow::StateVector::do_jsr | |
722 void ciTypeFlow::StateVector::do_jsr(ciBytecodeStream* str) { | |
723 push(ciReturnAddress::make(str->next_bci())); | |
724 } | |
725 | |
726 // ------------------------------------------------------------------ | |
727 // ciTypeFlow::StateVector::do_ldc | |
728 void ciTypeFlow::StateVector::do_ldc(ciBytecodeStream* str) { | |
729 ciConstant con = str->get_constant(); | |
730 BasicType basic_type = con.basic_type(); | |
731 if (basic_type == T_ILLEGAL) { | |
732 // OutOfMemoryError in the CI while loading constant | |
733 push_null(); | |
734 outer()->record_failure("ldc did not link"); | |
735 return; | |
736 } | |
737 if (basic_type == T_OBJECT || basic_type == T_ARRAY) { | |
738 ciObject* obj = con.as_object(); | |
739 if (obj->is_null_object()) { | |
740 push_null(); | |
741 } else { | |
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742 assert(!obj->is_klass(), "must be java_mirror of klass"); |
0 | 743 push_object(obj->klass()); |
744 } | |
745 } else { | |
746 push_translate(ciType::make(basic_type)); | |
747 } | |
748 } | |
749 | |
750 // ------------------------------------------------------------------ | |
751 // ciTypeFlow::StateVector::do_multianewarray | |
752 void ciTypeFlow::StateVector::do_multianewarray(ciBytecodeStream* str) { | |
753 int dimensions = str->get_dimensions(); | |
754 bool will_link; | |
755 ciArrayKlass* array_klass = str->get_klass(will_link)->as_array_klass(); | |
756 if (!will_link) { | |
757 trap(str, array_klass, str->get_klass_index()); | |
758 } else { | |
759 for (int i = 0; i < dimensions; i++) { | |
760 pop_int(); | |
761 } | |
762 push_object(array_klass); | |
763 } | |
764 } | |
765 | |
766 // ------------------------------------------------------------------ | |
767 // ciTypeFlow::StateVector::do_new | |
768 void ciTypeFlow::StateVector::do_new(ciBytecodeStream* str) { | |
769 bool will_link; | |
770 ciKlass* klass = str->get_klass(will_link); | |
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771 if (!will_link || str->is_unresolved_klass()) { |
0 | 772 trap(str, klass, str->get_klass_index()); |
773 } else { | |
774 push_object(klass); | |
775 } | |
776 } | |
777 | |
778 // ------------------------------------------------------------------ | |
779 // ciTypeFlow::StateVector::do_newarray | |
780 void ciTypeFlow::StateVector::do_newarray(ciBytecodeStream* str) { | |
781 pop_int(); | |
782 ciKlass* klass = ciTypeArrayKlass::make((BasicType)str->get_index()); | |
783 push_object(klass); | |
784 } | |
785 | |
786 // ------------------------------------------------------------------ | |
787 // ciTypeFlow::StateVector::do_putfield | |
788 void ciTypeFlow::StateVector::do_putfield(ciBytecodeStream* str) { | |
789 do_putstatic(str); | |
790 if (_trap_bci != -1) return; // unloaded field holder, etc. | |
791 // could add assert here for type of object. | |
792 pop_object(); | |
793 } | |
794 | |
795 // ------------------------------------------------------------------ | |
796 // ciTypeFlow::StateVector::do_putstatic | |
797 void ciTypeFlow::StateVector::do_putstatic(ciBytecodeStream* str) { | |
798 bool will_link; | |
799 ciField* field = str->get_field(will_link); | |
800 if (!will_link) { | |
801 trap(str, field->holder(), str->get_field_holder_index()); | |
802 } else { | |
803 ciType* field_type = field->type(); | |
804 ciType* type = pop_value(); | |
805 // Do I want to check this type? | |
806 // assert(type->is_subtype_of(field_type), "bad type for field value"); | |
807 if (field_type->is_two_word()) { | |
808 ciType* type2 = pop_value(); | |
809 assert(type2->is_two_word(), "must be 2nd half"); | |
810 assert(type == half_type(type2), "must be 2nd half"); | |
811 } | |
812 } | |
813 } | |
814 | |
815 // ------------------------------------------------------------------ | |
816 // ciTypeFlow::StateVector::do_ret | |
817 void ciTypeFlow::StateVector::do_ret(ciBytecodeStream* str) { | |
818 Cell index = local(str->get_index()); | |
819 | |
820 ciType* address = type_at(index); | |
821 assert(address->is_return_address(), "bad return address"); | |
822 set_type_at(index, bottom_type()); | |
823 } | |
824 | |
825 // ------------------------------------------------------------------ | |
826 // ciTypeFlow::StateVector::trap | |
827 // | |
828 // Stop interpretation of this path with a trap. | |
829 void ciTypeFlow::StateVector::trap(ciBytecodeStream* str, ciKlass* klass, int index) { | |
830 _trap_bci = str->cur_bci(); | |
831 _trap_index = index; | |
832 | |
833 // Log information about this trap: | |
834 CompileLog* log = outer()->env()->log(); | |
835 if (log != NULL) { | |
836 int mid = log->identify(outer()->method()); | |
837 int kid = (klass == NULL)? -1: log->identify(klass); | |
838 log->begin_elem("uncommon_trap method='%d' bci='%d'", mid, str->cur_bci()); | |
839 char buf[100]; | |
840 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), | |
841 index)); | |
842 if (kid >= 0) | |
843 log->print(" klass='%d'", kid); | |
844 log->end_elem(); | |
845 } | |
846 } | |
847 | |
848 // ------------------------------------------------------------------ | |
849 // ciTypeFlow::StateVector::do_null_assert | |
850 // Corresponds to graphKit::do_null_assert. | |
851 void ciTypeFlow::StateVector::do_null_assert(ciKlass* unloaded_klass) { | |
852 if (unloaded_klass->is_loaded()) { | |
853 // We failed to link, but we can still compute with this class, | |
854 // since it is loaded somewhere. The compiler will uncommon_trap | |
855 // if the object is not null, but the typeflow pass can not assume | |
856 // that the object will be null, otherwise it may incorrectly tell | |
857 // the parser that an object is known to be null. 4761344, 4807707 | |
858 push_object(unloaded_klass); | |
859 } else { | |
860 // The class is not loaded anywhere. It is safe to model the | |
861 // null in the typestates, because we can compile in a null check | |
862 // which will deoptimize us if someone manages to load the | |
863 // class later. | |
864 push_null(); | |
865 } | |
866 } | |
867 | |
868 | |
869 // ------------------------------------------------------------------ | |
870 // ciTypeFlow::StateVector::apply_one_bytecode | |
871 // | |
872 // Apply the effect of one bytecode to this StateVector | |
873 bool ciTypeFlow::StateVector::apply_one_bytecode(ciBytecodeStream* str) { | |
874 _trap_bci = -1; | |
875 _trap_index = 0; | |
876 | |
877 if (CITraceTypeFlow) { | |
878 tty->print_cr(">> Interpreting bytecode %d:%s", str->cur_bci(), | |
879 Bytecodes::name(str->cur_bc())); | |
880 } | |
881 | |
882 switch(str->cur_bc()) { | |
883 case Bytecodes::_aaload: do_aaload(str); break; | |
884 | |
885 case Bytecodes::_aastore: | |
886 { | |
887 pop_object(); | |
888 pop_int(); | |
889 pop_objArray(); | |
890 break; | |
891 } | |
892 case Bytecodes::_aconst_null: | |
893 { | |
894 push_null(); | |
895 break; | |
896 } | |
897 case Bytecodes::_aload: load_local_object(str->get_index()); break; | |
898 case Bytecodes::_aload_0: load_local_object(0); break; | |
899 case Bytecodes::_aload_1: load_local_object(1); break; | |
900 case Bytecodes::_aload_2: load_local_object(2); break; | |
901 case Bytecodes::_aload_3: load_local_object(3); break; | |
902 | |
903 case Bytecodes::_anewarray: | |
904 { | |
905 pop_int(); | |
906 bool will_link; | |
907 ciKlass* element_klass = str->get_klass(will_link); | |
908 if (!will_link) { | |
909 trap(str, element_klass, str->get_klass_index()); | |
910 } else { | |
911 push_object(ciObjArrayKlass::make(element_klass)); | |
912 } | |
913 break; | |
914 } | |
915 case Bytecodes::_areturn: | |
916 case Bytecodes::_ifnonnull: | |
917 case Bytecodes::_ifnull: | |
918 { | |
919 pop_object(); | |
920 break; | |
921 } | |
922 case Bytecodes::_monitorenter: | |
923 { | |
924 pop_object(); | |
925 set_monitor_count(monitor_count() + 1); | |
926 break; | |
927 } | |
928 case Bytecodes::_monitorexit: | |
929 { | |
930 pop_object(); | |
931 assert(monitor_count() > 0, "must be a monitor to exit from"); | |
932 set_monitor_count(monitor_count() - 1); | |
933 break; | |
934 } | |
935 case Bytecodes::_arraylength: | |
936 { | |
937 pop_array(); | |
938 push_int(); | |
939 break; | |
940 } | |
941 case Bytecodes::_astore: store_local_object(str->get_index()); break; | |
942 case Bytecodes::_astore_0: store_local_object(0); break; | |
943 case Bytecodes::_astore_1: store_local_object(1); break; | |
944 case Bytecodes::_astore_2: store_local_object(2); break; | |
945 case Bytecodes::_astore_3: store_local_object(3); break; | |
946 | |
947 case Bytecodes::_athrow: | |
948 { | |
949 NEEDS_CLEANUP; | |
950 pop_object(); | |
951 break; | |
952 } | |
953 case Bytecodes::_baload: | |
954 case Bytecodes::_caload: | |
955 case Bytecodes::_iaload: | |
956 case Bytecodes::_saload: | |
957 { | |
958 pop_int(); | |
959 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
960 // Put assert here for right type? | |
961 push_int(); | |
962 break; | |
963 } | |
964 case Bytecodes::_bastore: | |
965 case Bytecodes::_castore: | |
966 case Bytecodes::_iastore: | |
967 case Bytecodes::_sastore: | |
968 { | |
969 pop_int(); | |
970 pop_int(); | |
971 pop_typeArray(); | |
972 // assert here? | |
973 break; | |
974 } | |
975 case Bytecodes::_bipush: | |
976 case Bytecodes::_iconst_m1: | |
977 case Bytecodes::_iconst_0: | |
978 case Bytecodes::_iconst_1: | |
979 case Bytecodes::_iconst_2: | |
980 case Bytecodes::_iconst_3: | |
981 case Bytecodes::_iconst_4: | |
982 case Bytecodes::_iconst_5: | |
983 case Bytecodes::_sipush: | |
984 { | |
985 push_int(); | |
986 break; | |
987 } | |
988 case Bytecodes::_checkcast: do_checkcast(str); break; | |
989 | |
990 case Bytecodes::_d2f: | |
991 { | |
992 pop_double(); | |
993 push_float(); | |
994 break; | |
995 } | |
996 case Bytecodes::_d2i: | |
997 { | |
998 pop_double(); | |
999 push_int(); | |
1000 break; | |
1001 } | |
1002 case Bytecodes::_d2l: | |
1003 { | |
1004 pop_double(); | |
1005 push_long(); | |
1006 break; | |
1007 } | |
1008 case Bytecodes::_dadd: | |
1009 case Bytecodes::_ddiv: | |
1010 case Bytecodes::_dmul: | |
1011 case Bytecodes::_drem: | |
1012 case Bytecodes::_dsub: | |
1013 { | |
1014 pop_double(); | |
1015 pop_double(); | |
1016 push_double(); | |
1017 break; | |
1018 } | |
1019 case Bytecodes::_daload: | |
1020 { | |
1021 pop_int(); | |
1022 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
1023 // Put assert here for right type? | |
1024 push_double(); | |
1025 break; | |
1026 } | |
1027 case Bytecodes::_dastore: | |
1028 { | |
1029 pop_double(); | |
1030 pop_int(); | |
1031 pop_typeArray(); | |
1032 // assert here? | |
1033 break; | |
1034 } | |
1035 case Bytecodes::_dcmpg: | |
1036 case Bytecodes::_dcmpl: | |
1037 { | |
1038 pop_double(); | |
1039 pop_double(); | |
1040 push_int(); | |
1041 break; | |
1042 } | |
1043 case Bytecodes::_dconst_0: | |
1044 case Bytecodes::_dconst_1: | |
1045 { | |
1046 push_double(); | |
1047 break; | |
1048 } | |
1049 case Bytecodes::_dload: load_local_double(str->get_index()); break; | |
1050 case Bytecodes::_dload_0: load_local_double(0); break; | |
1051 case Bytecodes::_dload_1: load_local_double(1); break; | |
1052 case Bytecodes::_dload_2: load_local_double(2); break; | |
1053 case Bytecodes::_dload_3: load_local_double(3); break; | |
1054 | |
1055 case Bytecodes::_dneg: | |
1056 { | |
1057 pop_double(); | |
1058 push_double(); | |
1059 break; | |
1060 } | |
1061 case Bytecodes::_dreturn: | |
1062 { | |
1063 pop_double(); | |
1064 break; | |
1065 } | |
1066 case Bytecodes::_dstore: store_local_double(str->get_index()); break; | |
1067 case Bytecodes::_dstore_0: store_local_double(0); break; | |
1068 case Bytecodes::_dstore_1: store_local_double(1); break; | |
1069 case Bytecodes::_dstore_2: store_local_double(2); break; | |
1070 case Bytecodes::_dstore_3: store_local_double(3); break; | |
1071 | |
1072 case Bytecodes::_dup: | |
1073 { | |
1074 push(type_at_tos()); | |
1075 break; | |
1076 } | |
1077 case Bytecodes::_dup_x1: | |
1078 { | |
1079 ciType* value1 = pop_value(); | |
1080 ciType* value2 = pop_value(); | |
1081 push(value1); | |
1082 push(value2); | |
1083 push(value1); | |
1084 break; | |
1085 } | |
1086 case Bytecodes::_dup_x2: | |
1087 { | |
1088 ciType* value1 = pop_value(); | |
1089 ciType* value2 = pop_value(); | |
1090 ciType* value3 = pop_value(); | |
1091 push(value1); | |
1092 push(value3); | |
1093 push(value2); | |
1094 push(value1); | |
1095 break; | |
1096 } | |
1097 case Bytecodes::_dup2: | |
1098 { | |
1099 ciType* value1 = pop_value(); | |
1100 ciType* value2 = pop_value(); | |
1101 push(value2); | |
1102 push(value1); | |
1103 push(value2); | |
1104 push(value1); | |
1105 break; | |
1106 } | |
1107 case Bytecodes::_dup2_x1: | |
1108 { | |
1109 ciType* value1 = pop_value(); | |
1110 ciType* value2 = pop_value(); | |
1111 ciType* value3 = pop_value(); | |
1112 push(value2); | |
1113 push(value1); | |
1114 push(value3); | |
1115 push(value2); | |
1116 push(value1); | |
1117 break; | |
1118 } | |
1119 case Bytecodes::_dup2_x2: | |
1120 { | |
1121 ciType* value1 = pop_value(); | |
1122 ciType* value2 = pop_value(); | |
1123 ciType* value3 = pop_value(); | |
1124 ciType* value4 = pop_value(); | |
1125 push(value2); | |
1126 push(value1); | |
1127 push(value4); | |
1128 push(value3); | |
1129 push(value2); | |
1130 push(value1); | |
1131 break; | |
1132 } | |
1133 case Bytecodes::_f2d: | |
1134 { | |
1135 pop_float(); | |
1136 push_double(); | |
1137 break; | |
1138 } | |
1139 case Bytecodes::_f2i: | |
1140 { | |
1141 pop_float(); | |
1142 push_int(); | |
1143 break; | |
1144 } | |
1145 case Bytecodes::_f2l: | |
1146 { | |
1147 pop_float(); | |
1148 push_long(); | |
1149 break; | |
1150 } | |
1151 case Bytecodes::_fadd: | |
1152 case Bytecodes::_fdiv: | |
1153 case Bytecodes::_fmul: | |
1154 case Bytecodes::_frem: | |
1155 case Bytecodes::_fsub: | |
1156 { | |
1157 pop_float(); | |
1158 pop_float(); | |
1159 push_float(); | |
1160 break; | |
1161 } | |
1162 case Bytecodes::_faload: | |
1163 { | |
1164 pop_int(); | |
1165 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
1166 // Put assert here. | |
1167 push_float(); | |
1168 break; | |
1169 } | |
1170 case Bytecodes::_fastore: | |
1171 { | |
1172 pop_float(); | |
1173 pop_int(); | |
1174 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
1175 // Put assert here. | |
1176 break; | |
1177 } | |
1178 case Bytecodes::_fcmpg: | |
1179 case Bytecodes::_fcmpl: | |
1180 { | |
1181 pop_float(); | |
1182 pop_float(); | |
1183 push_int(); | |
1184 break; | |
1185 } | |
1186 case Bytecodes::_fconst_0: | |
1187 case Bytecodes::_fconst_1: | |
1188 case Bytecodes::_fconst_2: | |
1189 { | |
1190 push_float(); | |
1191 break; | |
1192 } | |
1193 case Bytecodes::_fload: load_local_float(str->get_index()); break; | |
1194 case Bytecodes::_fload_0: load_local_float(0); break; | |
1195 case Bytecodes::_fload_1: load_local_float(1); break; | |
1196 case Bytecodes::_fload_2: load_local_float(2); break; | |
1197 case Bytecodes::_fload_3: load_local_float(3); break; | |
1198 | |
1199 case Bytecodes::_fneg: | |
1200 { | |
1201 pop_float(); | |
1202 push_float(); | |
1203 break; | |
1204 } | |
1205 case Bytecodes::_freturn: | |
1206 { | |
1207 pop_float(); | |
1208 break; | |
1209 } | |
1210 case Bytecodes::_fstore: store_local_float(str->get_index()); break; | |
1211 case Bytecodes::_fstore_0: store_local_float(0); break; | |
1212 case Bytecodes::_fstore_1: store_local_float(1); break; | |
1213 case Bytecodes::_fstore_2: store_local_float(2); break; | |
1214 case Bytecodes::_fstore_3: store_local_float(3); break; | |
1215 | |
1216 case Bytecodes::_getfield: do_getfield(str); break; | |
1217 case Bytecodes::_getstatic: do_getstatic(str); break; | |
1218 | |
1219 case Bytecodes::_goto: | |
1220 case Bytecodes::_goto_w: | |
1221 case Bytecodes::_nop: | |
1222 case Bytecodes::_return: | |
1223 { | |
1224 // do nothing. | |
1225 break; | |
1226 } | |
1227 case Bytecodes::_i2b: | |
1228 case Bytecodes::_i2c: | |
1229 case Bytecodes::_i2s: | |
1230 case Bytecodes::_ineg: | |
1231 { | |
1232 pop_int(); | |
1233 push_int(); | |
1234 break; | |
1235 } | |
1236 case Bytecodes::_i2d: | |
1237 { | |
1238 pop_int(); | |
1239 push_double(); | |
1240 break; | |
1241 } | |
1242 case Bytecodes::_i2f: | |
1243 { | |
1244 pop_int(); | |
1245 push_float(); | |
1246 break; | |
1247 } | |
1248 case Bytecodes::_i2l: | |
1249 { | |
1250 pop_int(); | |
1251 push_long(); | |
1252 break; | |
1253 } | |
1254 case Bytecodes::_iadd: | |
1255 case Bytecodes::_iand: | |
1256 case Bytecodes::_idiv: | |
1257 case Bytecodes::_imul: | |
1258 case Bytecodes::_ior: | |
1259 case Bytecodes::_irem: | |
1260 case Bytecodes::_ishl: | |
1261 case Bytecodes::_ishr: | |
1262 case Bytecodes::_isub: | |
1263 case Bytecodes::_iushr: | |
1264 case Bytecodes::_ixor: | |
1265 { | |
1266 pop_int(); | |
1267 pop_int(); | |
1268 push_int(); | |
1269 break; | |
1270 } | |
1271 case Bytecodes::_if_acmpeq: | |
1272 case Bytecodes::_if_acmpne: | |
1273 { | |
1274 pop_object(); | |
1275 pop_object(); | |
1276 break; | |
1277 } | |
1278 case Bytecodes::_if_icmpeq: | |
1279 case Bytecodes::_if_icmpge: | |
1280 case Bytecodes::_if_icmpgt: | |
1281 case Bytecodes::_if_icmple: | |
1282 case Bytecodes::_if_icmplt: | |
1283 case Bytecodes::_if_icmpne: | |
1284 { | |
1285 pop_int(); | |
1286 pop_int(); | |
1287 break; | |
1288 } | |
1289 case Bytecodes::_ifeq: | |
1290 case Bytecodes::_ifle: | |
1291 case Bytecodes::_iflt: | |
1292 case Bytecodes::_ifge: | |
1293 case Bytecodes::_ifgt: | |
1294 case Bytecodes::_ifne: | |
1295 case Bytecodes::_ireturn: | |
1296 case Bytecodes::_lookupswitch: | |
1297 case Bytecodes::_tableswitch: | |
1298 { | |
1299 pop_int(); | |
1300 break; | |
1301 } | |
1302 case Bytecodes::_iinc: | |
1303 { | |
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1304 int lnum = str->get_index(); |
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1305 check_int(local(lnum)); |
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1306 store_to_local(lnum); |
0 | 1307 break; |
1308 } | |
1309 case Bytecodes::_iload: load_local_int(str->get_index()); break; | |
1310 case Bytecodes::_iload_0: load_local_int(0); break; | |
1311 case Bytecodes::_iload_1: load_local_int(1); break; | |
1312 case Bytecodes::_iload_2: load_local_int(2); break; | |
1313 case Bytecodes::_iload_3: load_local_int(3); break; | |
1314 | |
1315 case Bytecodes::_instanceof: | |
1316 { | |
1317 // Check for uncommon trap: | |
1318 do_checkcast(str); | |
1319 pop_object(); | |
1320 push_int(); | |
1321 break; | |
1322 } | |
1323 case Bytecodes::_invokeinterface: do_invoke(str, true); break; | |
1324 case Bytecodes::_invokespecial: do_invoke(str, true); break; | |
1325 case Bytecodes::_invokestatic: do_invoke(str, false); break; | |
1326 case Bytecodes::_invokevirtual: do_invoke(str, true); break; | |
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1327 case Bytecodes::_invokedynamic: do_invoke(str, false); break; |
0 | 1328 |
1329 case Bytecodes::_istore: store_local_int(str->get_index()); break; | |
1330 case Bytecodes::_istore_0: store_local_int(0); break; | |
1331 case Bytecodes::_istore_1: store_local_int(1); break; | |
1332 case Bytecodes::_istore_2: store_local_int(2); break; | |
1333 case Bytecodes::_istore_3: store_local_int(3); break; | |
1334 | |
1335 case Bytecodes::_jsr: | |
1336 case Bytecodes::_jsr_w: do_jsr(str); break; | |
1337 | |
1338 case Bytecodes::_l2d: | |
1339 { | |
1340 pop_long(); | |
1341 push_double(); | |
1342 break; | |
1343 } | |
1344 case Bytecodes::_l2f: | |
1345 { | |
1346 pop_long(); | |
1347 push_float(); | |
1348 break; | |
1349 } | |
1350 case Bytecodes::_l2i: | |
1351 { | |
1352 pop_long(); | |
1353 push_int(); | |
1354 break; | |
1355 } | |
1356 case Bytecodes::_ladd: | |
1357 case Bytecodes::_land: | |
1358 case Bytecodes::_ldiv: | |
1359 case Bytecodes::_lmul: | |
1360 case Bytecodes::_lor: | |
1361 case Bytecodes::_lrem: | |
1362 case Bytecodes::_lsub: | |
1363 case Bytecodes::_lxor: | |
1364 { | |
1365 pop_long(); | |
1366 pop_long(); | |
1367 push_long(); | |
1368 break; | |
1369 } | |
1370 case Bytecodes::_laload: | |
1371 { | |
1372 pop_int(); | |
1373 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
1374 // Put assert here for right type? | |
1375 push_long(); | |
1376 break; | |
1377 } | |
1378 case Bytecodes::_lastore: | |
1379 { | |
1380 pop_long(); | |
1381 pop_int(); | |
1382 pop_typeArray(); | |
1383 // assert here? | |
1384 break; | |
1385 } | |
1386 case Bytecodes::_lcmp: | |
1387 { | |
1388 pop_long(); | |
1389 pop_long(); | |
1390 push_int(); | |
1391 break; | |
1392 } | |
1393 case Bytecodes::_lconst_0: | |
1394 case Bytecodes::_lconst_1: | |
1395 { | |
1396 push_long(); | |
1397 break; | |
1398 } | |
1399 case Bytecodes::_ldc: | |
1400 case Bytecodes::_ldc_w: | |
1401 case Bytecodes::_ldc2_w: | |
1402 { | |
1403 do_ldc(str); | |
1404 break; | |
1405 } | |
1406 | |
1407 case Bytecodes::_lload: load_local_long(str->get_index()); break; | |
1408 case Bytecodes::_lload_0: load_local_long(0); break; | |
1409 case Bytecodes::_lload_1: load_local_long(1); break; | |
1410 case Bytecodes::_lload_2: load_local_long(2); break; | |
1411 case Bytecodes::_lload_3: load_local_long(3); break; | |
1412 | |
1413 case Bytecodes::_lneg: | |
1414 { | |
1415 pop_long(); | |
1416 push_long(); | |
1417 break; | |
1418 } | |
1419 case Bytecodes::_lreturn: | |
1420 { | |
1421 pop_long(); | |
1422 break; | |
1423 } | |
1424 case Bytecodes::_lshl: | |
1425 case Bytecodes::_lshr: | |
1426 case Bytecodes::_lushr: | |
1427 { | |
1428 pop_int(); | |
1429 pop_long(); | |
1430 push_long(); | |
1431 break; | |
1432 } | |
1433 case Bytecodes::_lstore: store_local_long(str->get_index()); break; | |
1434 case Bytecodes::_lstore_0: store_local_long(0); break; | |
1435 case Bytecodes::_lstore_1: store_local_long(1); break; | |
1436 case Bytecodes::_lstore_2: store_local_long(2); break; | |
1437 case Bytecodes::_lstore_3: store_local_long(3); break; | |
1438 | |
1439 case Bytecodes::_multianewarray: do_multianewarray(str); break; | |
1440 | |
1441 case Bytecodes::_new: do_new(str); break; | |
1442 | |
1443 case Bytecodes::_newarray: do_newarray(str); break; | |
1444 | |
1445 case Bytecodes::_pop: | |
1446 { | |
1447 pop(); | |
1448 break; | |
1449 } | |
1450 case Bytecodes::_pop2: | |
1451 { | |
1452 pop(); | |
1453 pop(); | |
1454 break; | |
1455 } | |
1456 | |
1457 case Bytecodes::_putfield: do_putfield(str); break; | |
1458 case Bytecodes::_putstatic: do_putstatic(str); break; | |
1459 | |
1460 case Bytecodes::_ret: do_ret(str); break; | |
1461 | |
1462 case Bytecodes::_swap: | |
1463 { | |
1464 ciType* value1 = pop_value(); | |
1465 ciType* value2 = pop_value(); | |
1466 push(value1); | |
1467 push(value2); | |
1468 break; | |
1469 } | |
1470 case Bytecodes::_wide: | |
1471 default: | |
1472 { | |
1473 // The iterator should skip this. | |
1474 ShouldNotReachHere(); | |
1475 break; | |
1476 } | |
1477 } | |
1478 | |
1479 if (CITraceTypeFlow) { | |
1480 print_on(tty); | |
1481 } | |
1482 | |
1483 return (_trap_bci != -1); | |
1484 } | |
1485 | |
1486 #ifndef PRODUCT | |
1487 // ------------------------------------------------------------------ | |
1488 // ciTypeFlow::StateVector::print_cell_on | |
1489 void ciTypeFlow::StateVector::print_cell_on(outputStream* st, Cell c) const { | |
1490 ciType* type = type_at(c); | |
1491 if (type == top_type()) { | |
1492 st->print("top"); | |
1493 } else if (type == bottom_type()) { | |
1494 st->print("bottom"); | |
1495 } else if (type == null_type()) { | |
1496 st->print("null"); | |
1497 } else if (type == long2_type()) { | |
1498 st->print("long2"); | |
1499 } else if (type == double2_type()) { | |
1500 st->print("double2"); | |
1501 } else if (is_int(type)) { | |
1502 st->print("int"); | |
1503 } else if (is_long(type)) { | |
1504 st->print("long"); | |
1505 } else if (is_float(type)) { | |
1506 st->print("float"); | |
1507 } else if (is_double(type)) { | |
1508 st->print("double"); | |
1509 } else if (type->is_return_address()) { | |
1510 st->print("address(%d)", type->as_return_address()->bci()); | |
1511 } else { | |
1512 if (type->is_klass()) { | |
1513 type->as_klass()->name()->print_symbol_on(st); | |
1514 } else { | |
1515 st->print("UNEXPECTED TYPE"); | |
1516 type->print(); | |
1517 } | |
1518 } | |
1519 } | |
1520 | |
1521 // ------------------------------------------------------------------ | |
1522 // ciTypeFlow::StateVector::print_on | |
1523 void ciTypeFlow::StateVector::print_on(outputStream* st) const { | |
1524 int num_locals = _outer->max_locals(); | |
1525 int num_stack = stack_size(); | |
1526 int num_monitors = monitor_count(); | |
1527 st->print_cr(" State : locals %d, stack %d, monitors %d", num_locals, num_stack, num_monitors); | |
1528 if (num_stack >= 0) { | |
1529 int i; | |
1530 for (i = 0; i < num_locals; i++) { | |
1531 st->print(" local %2d : ", i); | |
1532 print_cell_on(st, local(i)); | |
1533 st->cr(); | |
1534 } | |
1535 for (i = 0; i < num_stack; i++) { | |
1536 st->print(" stack %2d : ", i); | |
1537 print_cell_on(st, stack(i)); | |
1538 st->cr(); | |
1539 } | |
1540 } | |
1541 } | |
1542 #endif | |
1543 | |
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1544 |
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1545 // ------------------------------------------------------------------ |
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1546 // ciTypeFlow::SuccIter::next |
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1547 // |
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1548 void ciTypeFlow::SuccIter::next() { |
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1549 int succ_ct = _pred->successors()->length(); |
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1550 int next = _index + 1; |
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1551 if (next < succ_ct) { |
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1552 _index = next; |
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1553 _succ = _pred->successors()->at(next); |
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1554 return; |
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1555 } |
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1556 for (int i = next - succ_ct; i < _pred->exceptions()->length(); i++) { |
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1557 // Do not compile any code for unloaded exception types. |
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1558 // Following compiler passes are responsible for doing this also. |
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1559 ciInstanceKlass* exception_klass = _pred->exc_klasses()->at(i); |
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1560 if (exception_klass->is_loaded()) { |
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1561 _index = next; |
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1562 _succ = _pred->exceptions()->at(i); |
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1563 return; |
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1564 } |
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1565 next++; |
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1566 } |
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1567 _index = -1; |
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1568 _succ = NULL; |
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1569 } |
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1570 |
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1571 // ------------------------------------------------------------------ |
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1572 // ciTypeFlow::SuccIter::set_succ |
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1573 // |
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1574 void ciTypeFlow::SuccIter::set_succ(Block* succ) { |
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1575 int succ_ct = _pred->successors()->length(); |
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1576 if (_index < succ_ct) { |
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1577 _pred->successors()->at_put(_index, succ); |
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1578 } else { |
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1579 int idx = _index - succ_ct; |
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1580 _pred->exceptions()->at_put(idx, succ); |
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1581 } |
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1582 } |
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1583 |
0 | 1584 // ciTypeFlow::Block |
1585 // | |
1586 // A basic block. | |
1587 | |
1588 // ------------------------------------------------------------------ | |
1589 // ciTypeFlow::Block::Block | |
1590 ciTypeFlow::Block::Block(ciTypeFlow* outer, | |
1591 ciBlock *ciblk, | |
1592 ciTypeFlow::JsrSet* jsrs) { | |
1593 _ciblock = ciblk; | |
1594 _exceptions = NULL; | |
1595 _exc_klasses = NULL; | |
1596 _successors = NULL; | |
1597 _state = new (outer->arena()) StateVector(outer); | |
1598 JsrSet* new_jsrs = | |
1599 new (outer->arena()) JsrSet(outer->arena(), jsrs->size()); | |
1600 jsrs->copy_into(new_jsrs); | |
1601 _jsrs = new_jsrs; | |
1602 _next = NULL; | |
1603 _on_work_list = false; | |
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1604 _backedge_copy = false; |
4777 | 1605 _has_monitorenter = false; |
0 | 1606 _trap_bci = -1; |
1607 _trap_index = 0; | |
367
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1608 df_init(); |
0 | 1609 |
1610 if (CITraceTypeFlow) { | |
1611 tty->print_cr(">> Created new block"); | |
1612 print_on(tty); | |
1613 } | |
1614 | |
1615 assert(this->outer() == outer, "outer link set up"); | |
1616 assert(!outer->have_block_count(), "must not have mapped blocks yet"); | |
1617 } | |
1618 | |
1619 // ------------------------------------------------------------------ | |
367
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1620 // ciTypeFlow::Block::df_init |
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1621 void ciTypeFlow::Block::df_init() { |
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1622 _pre_order = -1; assert(!has_pre_order(), ""); |
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1623 _post_order = -1; assert(!has_post_order(), ""); |
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1624 _loop = NULL; |
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1625 _irreducible_entry = false; |
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1626 _rpo_next = NULL; |
0 | 1627 } |
1628 | |
1629 // ------------------------------------------------------------------ | |
1630 // ciTypeFlow::Block::successors | |
1631 // | |
1632 // Get the successors for this Block. | |
1633 GrowableArray<ciTypeFlow::Block*>* | |
1634 ciTypeFlow::Block::successors(ciBytecodeStream* str, | |
1635 ciTypeFlow::StateVector* state, | |
1636 ciTypeFlow::JsrSet* jsrs) { | |
1637 if (_successors == NULL) { | |
1638 if (CITraceTypeFlow) { | |
1639 tty->print(">> Computing successors for block "); | |
1640 print_value_on(tty); | |
1641 tty->cr(); | |
1642 } | |
1643 | |
1644 ciTypeFlow* analyzer = outer(); | |
1645 Arena* arena = analyzer->arena(); | |
1646 Block* block = NULL; | |
1647 bool has_successor = !has_trap() && | |
1648 (control() != ciBlock::fall_through_bci || limit() < analyzer->code_size()); | |
1649 if (!has_successor) { | |
1650 _successors = | |
1651 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
1652 // No successors | |
1653 } else if (control() == ciBlock::fall_through_bci) { | |
1654 assert(str->cur_bci() == limit(), "bad block end"); | |
1655 // This block simply falls through to the next. | |
1656 _successors = | |
1657 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
1658 | |
1659 Block* block = analyzer->block_at(limit(), _jsrs); | |
1660 assert(_successors->length() == FALL_THROUGH, ""); | |
1661 _successors->append(block); | |
1662 } else { | |
1663 int current_bci = str->cur_bci(); | |
1664 int next_bci = str->next_bci(); | |
1665 int branch_bci = -1; | |
1666 Block* target = NULL; | |
1667 assert(str->next_bci() == limit(), "bad block end"); | |
1668 // This block is not a simple fall-though. Interpret | |
1669 // the current bytecode to find our successors. | |
1670 switch (str->cur_bc()) { | |
1671 case Bytecodes::_ifeq: case Bytecodes::_ifne: | |
1672 case Bytecodes::_iflt: case Bytecodes::_ifge: | |
1673 case Bytecodes::_ifgt: case Bytecodes::_ifle: | |
1674 case Bytecodes::_if_icmpeq: case Bytecodes::_if_icmpne: | |
1675 case Bytecodes::_if_icmplt: case Bytecodes::_if_icmpge: | |
1676 case Bytecodes::_if_icmpgt: case Bytecodes::_if_icmple: | |
1677 case Bytecodes::_if_acmpeq: case Bytecodes::_if_acmpne: | |
1678 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: | |
1679 // Our successors are the branch target and the next bci. | |
1680 branch_bci = str->get_dest(); | |
1681 _successors = | |
1682 new (arena) GrowableArray<Block*>(arena, 2, 0, NULL); | |
1683 assert(_successors->length() == IF_NOT_TAKEN, ""); | |
1684 _successors->append(analyzer->block_at(next_bci, jsrs)); | |
1685 assert(_successors->length() == IF_TAKEN, ""); | |
1686 _successors->append(analyzer->block_at(branch_bci, jsrs)); | |
1687 break; | |
1688 | |
1689 case Bytecodes::_goto: | |
1690 branch_bci = str->get_dest(); | |
1691 _successors = | |
1692 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
1693 assert(_successors->length() == GOTO_TARGET, ""); | |
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1694 _successors->append(analyzer->block_at(branch_bci, jsrs)); |
0 | 1695 break; |
1696 | |
1697 case Bytecodes::_jsr: | |
1698 branch_bci = str->get_dest(); | |
1699 _successors = | |
1700 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
1701 assert(_successors->length() == GOTO_TARGET, ""); | |
1702 _successors->append(analyzer->block_at(branch_bci, jsrs)); | |
1703 break; | |
1704 | |
1705 case Bytecodes::_goto_w: | |
1706 case Bytecodes::_jsr_w: | |
1707 _successors = | |
1708 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
1709 assert(_successors->length() == GOTO_TARGET, ""); | |
1710 _successors->append(analyzer->block_at(str->get_far_dest(), jsrs)); | |
1711 break; | |
1712 | |
1713 case Bytecodes::_tableswitch: { | |
2142 | 1714 Bytecode_tableswitch tableswitch(str); |
0 | 1715 |
2142 | 1716 int len = tableswitch.length(); |
0 | 1717 _successors = |
1718 new (arena) GrowableArray<Block*>(arena, len+1, 0, NULL); | |
2142 | 1719 int bci = current_bci + tableswitch.default_offset(); |
0 | 1720 Block* block = analyzer->block_at(bci, jsrs); |
1721 assert(_successors->length() == SWITCH_DEFAULT, ""); | |
1722 _successors->append(block); | |
1723 while (--len >= 0) { | |
2142 | 1724 int bci = current_bci + tableswitch.dest_offset_at(len); |
0 | 1725 block = analyzer->block_at(bci, jsrs); |
1726 assert(_successors->length() >= SWITCH_CASES, ""); | |
1727 _successors->append_if_missing(block); | |
1728 } | |
1729 break; | |
1730 } | |
1731 | |
1732 case Bytecodes::_lookupswitch: { | |
2142 | 1733 Bytecode_lookupswitch lookupswitch(str); |
0 | 1734 |
2142 | 1735 int npairs = lookupswitch.number_of_pairs(); |
0 | 1736 _successors = |
1737 new (arena) GrowableArray<Block*>(arena, npairs+1, 0, NULL); | |
2142 | 1738 int bci = current_bci + lookupswitch.default_offset(); |
0 | 1739 Block* block = analyzer->block_at(bci, jsrs); |
1740 assert(_successors->length() == SWITCH_DEFAULT, ""); | |
1741 _successors->append(block); | |
1742 while(--npairs >= 0) { | |
2142 | 1743 LookupswitchPair pair = lookupswitch.pair_at(npairs); |
1744 int bci = current_bci + pair.offset(); | |
0 | 1745 Block* block = analyzer->block_at(bci, jsrs); |
1746 assert(_successors->length() >= SWITCH_CASES, ""); | |
1747 _successors->append_if_missing(block); | |
1748 } | |
1749 break; | |
1750 } | |
1751 | |
1752 case Bytecodes::_athrow: case Bytecodes::_ireturn: | |
1753 case Bytecodes::_lreturn: case Bytecodes::_freturn: | |
1754 case Bytecodes::_dreturn: case Bytecodes::_areturn: | |
1755 case Bytecodes::_return: | |
1756 _successors = | |
1757 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
1758 // No successors | |
1759 break; | |
1760 | |
1761 case Bytecodes::_ret: { | |
1762 _successors = | |
1763 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
1764 | |
1765 Cell local = state->local(str->get_index()); | |
1766 ciType* return_address = state->type_at(local); | |
1767 assert(return_address->is_return_address(), "verify: wrong type"); | |
1768 int bci = return_address->as_return_address()->bci(); | |
1769 assert(_successors->length() == GOTO_TARGET, ""); | |
1770 _successors->append(analyzer->block_at(bci, jsrs)); | |
1771 break; | |
1772 } | |
1773 | |
1774 case Bytecodes::_wide: | |
1775 default: | |
1776 ShouldNotReachHere(); | |
1777 break; | |
1778 } | |
1779 } | |
1780 } | |
1781 return _successors; | |
1782 } | |
1783 | |
1784 // ------------------------------------------------------------------ | |
1785 // ciTypeFlow::Block:compute_exceptions | |
1786 // | |
1787 // Compute the exceptional successors and types for this Block. | |
1788 void ciTypeFlow::Block::compute_exceptions() { | |
1789 assert(_exceptions == NULL && _exc_klasses == NULL, "repeat"); | |
1790 | |
1791 if (CITraceTypeFlow) { | |
1792 tty->print(">> Computing exceptions for block "); | |
1793 print_value_on(tty); | |
1794 tty->cr(); | |
1795 } | |
1796 | |
1797 ciTypeFlow* analyzer = outer(); | |
1798 Arena* arena = analyzer->arena(); | |
1799 | |
1800 // Any bci in the block will do. | |
1801 ciExceptionHandlerStream str(analyzer->method(), start()); | |
1802 | |
1803 // Allocate our growable arrays. | |
1804 int exc_count = str.count(); | |
1805 _exceptions = new (arena) GrowableArray<Block*>(arena, exc_count, 0, NULL); | |
1806 _exc_klasses = new (arena) GrowableArray<ciInstanceKlass*>(arena, exc_count, | |
1807 0, NULL); | |
1808 | |
1809 for ( ; !str.is_done(); str.next()) { | |
1810 ciExceptionHandler* handler = str.handler(); | |
1811 int bci = handler->handler_bci(); | |
1812 ciInstanceKlass* klass = NULL; | |
1813 if (bci == -1) { | |
1814 // There is no catch all. It is possible to exit the method. | |
1815 break; | |
1816 } | |
1817 if (handler->is_catch_all()) { | |
1818 klass = analyzer->env()->Throwable_klass(); | |
1819 } else { | |
1820 klass = handler->catch_klass(); | |
1821 } | |
1822 _exceptions->append(analyzer->block_at(bci, _jsrs)); | |
1823 _exc_klasses->append(klass); | |
1824 } | |
1825 } | |
1826 | |
1827 // ------------------------------------------------------------------ | |
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1828 // ciTypeFlow::Block::set_backedge_copy |
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1829 // Use this only to make a pre-existing public block into a backedge copy. |
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1830 void ciTypeFlow::Block::set_backedge_copy(bool z) { |
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1831 assert(z || (z == is_backedge_copy()), "cannot make a backedge copy public"); |
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1832 _backedge_copy = z; |
0 | 1833 } |
1834 | |
1835 // ------------------------------------------------------------------ | |
367
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1836 // ciTypeFlow::Block::is_clonable_exit |
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1837 // |
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1838 // At most 2 normal successors, one of which continues looping, |
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1839 // and all exceptional successors must exit. |
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1840 bool ciTypeFlow::Block::is_clonable_exit(ciTypeFlow::Loop* lp) { |
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1841 int normal_cnt = 0; |
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1842 int in_loop_cnt = 0; |
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1843 for (SuccIter iter(this); !iter.done(); iter.next()) { |
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1844 Block* succ = iter.succ(); |
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1845 if (iter.is_normal_ctrl()) { |
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1846 if (++normal_cnt > 2) return false; |
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1847 if (lp->contains(succ->loop())) { |
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1848 if (++in_loop_cnt > 1) return false; |
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1849 } |
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1850 } else { |
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1851 if (lp->contains(succ->loop())) return false; |
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1852 } |
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1853 } |
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1854 return in_loop_cnt == 1; |
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1855 } |
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1856 |
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1857 // ------------------------------------------------------------------ |
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1858 // ciTypeFlow::Block::looping_succ |
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1859 // |
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1860 ciTypeFlow::Block* ciTypeFlow::Block::looping_succ(ciTypeFlow::Loop* lp) { |
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1861 assert(successors()->length() <= 2, "at most 2 normal successors"); |
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1862 for (SuccIter iter(this); !iter.done(); iter.next()) { |
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1863 Block* succ = iter.succ(); |
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1864 if (lp->contains(succ->loop())) { |
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1865 return succ; |
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1866 } |
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1867 } |
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1868 return NULL; |
0 | 1869 } |
1870 | |
1871 #ifndef PRODUCT | |
1872 // ------------------------------------------------------------------ | |
1873 // ciTypeFlow::Block::print_value_on | |
1874 void ciTypeFlow::Block::print_value_on(outputStream* st) const { | |
367
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1875 if (has_pre_order()) st->print("#%-2d ", pre_order()); |
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1876 if (has_rpo()) st->print("rpo#%-2d ", rpo()); |
0 | 1877 st->print("[%d - %d)", start(), limit()); |
367
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1878 if (is_loop_head()) st->print(" lphd"); |
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1879 if (is_irreducible_entry()) st->print(" irred"); |
0 | 1880 if (_jsrs->size() > 0) { st->print("/"); _jsrs->print_on(st); } |
367
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1881 if (is_backedge_copy()) st->print("/backedge_copy"); |
0 | 1882 } |
1883 | |
1884 // ------------------------------------------------------------------ | |
1885 // ciTypeFlow::Block::print_on | |
1886 void ciTypeFlow::Block::print_on(outputStream* st) const { | |
2398
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1887 if ((Verbose || WizardMode) && (limit() >= 0)) { |
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1888 // Don't print 'dummy' blocks (i.e. blocks with limit() '-1') |
0 | 1889 outer()->method()->print_codes_on(start(), limit(), st); |
1890 } | |
1891 st->print_cr(" ==================================================== "); | |
1892 st->print (" "); | |
1893 print_value_on(st); | |
367
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1894 st->print(" Stored locals: "); def_locals()->print_on(st, outer()->method()->max_locals()); tty->cr(); |
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1895 if (loop() && loop()->parent() != NULL) { |
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1896 st->print(" loops:"); |
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1897 Loop* lp = loop(); |
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1898 do { |
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1899 st->print(" %d<-%d", lp->head()->pre_order(),lp->tail()->pre_order()); |
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1900 if (lp->is_irreducible()) st->print("(ir)"); |
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1901 lp = lp->parent(); |
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1902 } while (lp->parent() != NULL); |
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1903 } |
0 | 1904 st->cr(); |
1905 _state->print_on(st); | |
1906 if (_successors == NULL) { | |
1907 st->print_cr(" No successor information"); | |
1908 } else { | |
1909 int num_successors = _successors->length(); | |
1910 st->print_cr(" Successors : %d", num_successors); | |
1911 for (int i = 0; i < num_successors; i++) { | |
1912 Block* successor = _successors->at(i); | |
1913 st->print(" "); | |
1914 successor->print_value_on(st); | |
1915 st->cr(); | |
1916 } | |
1917 } | |
1918 if (_exceptions == NULL) { | |
1919 st->print_cr(" No exception information"); | |
1920 } else { | |
1921 int num_exceptions = _exceptions->length(); | |
1922 st->print_cr(" Exceptions : %d", num_exceptions); | |
1923 for (int i = 0; i < num_exceptions; i++) { | |
1924 Block* exc_succ = _exceptions->at(i); | |
1925 ciInstanceKlass* exc_klass = _exc_klasses->at(i); | |
1926 st->print(" "); | |
1927 exc_succ->print_value_on(st); | |
1928 st->print(" -- "); | |
1929 exc_klass->name()->print_symbol_on(st); | |
1930 st->cr(); | |
1931 } | |
1932 } | |
1933 if (has_trap()) { | |
1934 st->print_cr(" Traps on %d with trap index %d", trap_bci(), trap_index()); | |
1935 } | |
1936 st->print_cr(" ==================================================== "); | |
1937 } | |
1938 #endif | |
1939 | |
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1940 #ifndef PRODUCT |
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1941 // ------------------------------------------------------------------ |
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1942 // ciTypeFlow::LocalSet::print_on |
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1943 void ciTypeFlow::LocalSet::print_on(outputStream* st, int limit) const { |
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1944 st->print("{"); |
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1945 for (int i = 0; i < max; i++) { |
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1946 if (test(i)) st->print(" %d", i); |
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1947 } |
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1948 if (limit > max) { |
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1949 st->print(" %d..%d ", max, limit); |
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1950 } |
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1951 st->print(" }"); |
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1952 } |
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1953 #endif |
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1954 |
0 | 1955 // ciTypeFlow |
1956 // | |
1957 // This is a pass over the bytecodes which computes the following: | |
1958 // basic block structure | |
1959 // interpreter type-states (a la the verifier) | |
1960 | |
1961 // ------------------------------------------------------------------ | |
1962 // ciTypeFlow::ciTypeFlow | |
1963 ciTypeFlow::ciTypeFlow(ciEnv* env, ciMethod* method, int osr_bci) { | |
1964 _env = env; | |
1965 _method = method; | |
1966 _methodBlocks = method->get_method_blocks(); | |
1967 _max_locals = method->max_locals(); | |
1968 _max_stack = method->max_stack(); | |
1969 _code_size = method->code_size(); | |
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1970 _has_irreducible_entry = false; |
0 | 1971 _osr_bci = osr_bci; |
1972 _failure_reason = NULL; | |
1846 | 1973 assert(0 <= start_bci() && start_bci() < code_size() , err_msg("correct osr_bci argument: 0 <= %d < %d", start_bci(), code_size())); |
0 | 1974 _work_list = NULL; |
1975 | |
1976 _ciblock_count = _methodBlocks->num_blocks(); | |
1977 _idx_to_blocklist = NEW_ARENA_ARRAY(arena(), GrowableArray<Block*>*, _ciblock_count); | |
1978 for (int i = 0; i < _ciblock_count; i++) { | |
1979 _idx_to_blocklist[i] = NULL; | |
1980 } | |
1981 _block_map = NULL; // until all blocks are seen | |
1982 _jsr_count = 0; | |
1983 _jsr_records = NULL; | |
1984 } | |
1985 | |
1986 // ------------------------------------------------------------------ | |
1987 // ciTypeFlow::work_list_next | |
1988 // | |
1989 // Get the next basic block from our work list. | |
1990 ciTypeFlow::Block* ciTypeFlow::work_list_next() { | |
1991 assert(!work_list_empty(), "work list must not be empty"); | |
1992 Block* next_block = _work_list; | |
1993 _work_list = next_block->next(); | |
1994 next_block->set_next(NULL); | |
1995 next_block->set_on_work_list(false); | |
1996 return next_block; | |
1997 } | |
1998 | |
1999 // ------------------------------------------------------------------ | |
2000 // ciTypeFlow::add_to_work_list | |
2001 // | |
2002 // Add a basic block to our work list. | |
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2003 // List is sorted by decreasing postorder sort (same as increasing RPO) |
0 | 2004 void ciTypeFlow::add_to_work_list(ciTypeFlow::Block* block) { |
2005 assert(!block->is_on_work_list(), "must not already be on work list"); | |
2006 | |
2007 if (CITraceTypeFlow) { | |
367
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2008 tty->print(">> Adding block "); |
0 | 2009 block->print_value_on(tty); |
2010 tty->print_cr(" to the work list : "); | |
2011 } | |
2012 | |
2013 block->set_on_work_list(true); | |
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2014 |
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2015 // decreasing post order sort |
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2016 |
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2017 Block* prev = NULL; |
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2018 Block* current = _work_list; |
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2019 int po = block->post_order(); |
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2020 while (current != NULL) { |
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2021 if (!current->has_post_order() || po > current->post_order()) |
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2022 break; |
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2023 prev = current; |
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2024 current = current->next(); |
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2025 } |
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2026 if (prev == NULL) { |
0 | 2027 block->set_next(_work_list); |
2028 _work_list = block; | |
2029 } else { | |
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2030 block->set_next(current); |
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2031 prev->set_next(block); |
0 | 2032 } |
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2033 |
0 | 2034 if (CITraceTypeFlow) { |
2035 tty->cr(); | |
2036 } | |
2037 } | |
2038 | |
2039 // ------------------------------------------------------------------ | |
2040 // ciTypeFlow::block_at | |
2041 // | |
2042 // Return the block beginning at bci which has a JsrSet compatible | |
2043 // with jsrs. | |
2044 ciTypeFlow::Block* ciTypeFlow::block_at(int bci, ciTypeFlow::JsrSet* jsrs, CreateOption option) { | |
2045 // First find the right ciBlock. | |
2046 if (CITraceTypeFlow) { | |
2047 tty->print(">> Requesting block for %d/", bci); | |
2048 jsrs->print_on(tty); | |
2049 tty->cr(); | |
2050 } | |
2051 | |
2052 ciBlock* ciblk = _methodBlocks->block_containing(bci); | |
2053 assert(ciblk->start_bci() == bci, "bad ciBlock boundaries"); | |
2054 Block* block = get_block_for(ciblk->index(), jsrs, option); | |
2055 | |
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2056 assert(block == NULL? (option == no_create): block->is_backedge_copy() == (option == create_backedge_copy), "create option consistent with result"); |
0 | 2057 |
2058 if (CITraceTypeFlow) { | |
2059 if (block != NULL) { | |
2060 tty->print(">> Found block "); | |
2061 block->print_value_on(tty); | |
2062 tty->cr(); | |
2063 } else { | |
2064 tty->print_cr(">> No such block."); | |
2065 } | |
2066 } | |
2067 | |
2068 return block; | |
2069 } | |
2070 | |
2071 // ------------------------------------------------------------------ | |
2072 // ciTypeFlow::make_jsr_record | |
2073 // | |
2074 // Make a JsrRecord for a given (entry, return) pair, if such a record | |
2075 // does not already exist. | |
2076 ciTypeFlow::JsrRecord* ciTypeFlow::make_jsr_record(int entry_address, | |
2077 int return_address) { | |
2078 if (_jsr_records == NULL) { | |
2079 _jsr_records = new (arena()) GrowableArray<JsrRecord*>(arena(), | |
2080 _jsr_count, | |
2081 0, | |
2082 NULL); | |
2083 } | |
2084 JsrRecord* record = NULL; | |
2085 int len = _jsr_records->length(); | |
2086 for (int i = 0; i < len; i++) { | |
2087 JsrRecord* record = _jsr_records->at(i); | |
2088 if (record->entry_address() == entry_address && | |
2089 record->return_address() == return_address) { | |
2090 return record; | |
2091 } | |
2092 } | |
2093 | |
2094 record = new (arena()) JsrRecord(entry_address, return_address); | |
2095 _jsr_records->append(record); | |
2096 return record; | |
2097 } | |
2098 | |
2099 // ------------------------------------------------------------------ | |
2100 // ciTypeFlow::flow_exceptions | |
2101 // | |
2102 // Merge the current state into all exceptional successors at the | |
2103 // current point in the code. | |
2104 void ciTypeFlow::flow_exceptions(GrowableArray<ciTypeFlow::Block*>* exceptions, | |
2105 GrowableArray<ciInstanceKlass*>* exc_klasses, | |
2106 ciTypeFlow::StateVector* state) { | |
2107 int len = exceptions->length(); | |
2108 assert(exc_klasses->length() == len, "must have same length"); | |
2109 for (int i = 0; i < len; i++) { | |
2110 Block* block = exceptions->at(i); | |
2111 ciInstanceKlass* exception_klass = exc_klasses->at(i); | |
2112 | |
2113 if (!exception_klass->is_loaded()) { | |
2114 // Do not compile any code for unloaded exception types. | |
2115 // Following compiler passes are responsible for doing this also. | |
2116 continue; | |
2117 } | |
2118 | |
2119 if (block->meet_exception(exception_klass, state)) { | |
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2120 // Block was modified and has PO. Add it to the work list. |
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2121 if (block->has_post_order() && |
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2122 !block->is_on_work_list()) { |
0 | 2123 add_to_work_list(block); |
2124 } | |
2125 } | |
2126 } | |
2127 } | |
2128 | |
2129 // ------------------------------------------------------------------ | |
2130 // ciTypeFlow::flow_successors | |
2131 // | |
2132 // Merge the current state into all successors at the current point | |
2133 // in the code. | |
2134 void ciTypeFlow::flow_successors(GrowableArray<ciTypeFlow::Block*>* successors, | |
2135 ciTypeFlow::StateVector* state) { | |
2136 int len = successors->length(); | |
2137 for (int i = 0; i < len; i++) { | |
2138 Block* block = successors->at(i); | |
2139 if (block->meet(state)) { | |
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2140 // Block was modified and has PO. Add it to the work list. |
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2141 if (block->has_post_order() && |
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2142 !block->is_on_work_list()) { |
0 | 2143 add_to_work_list(block); |
2144 } | |
2145 } | |
2146 } | |
2147 } | |
2148 | |
2149 // ------------------------------------------------------------------ | |
2150 // ciTypeFlow::can_trap | |
2151 // | |
2152 // Tells if a given instruction is able to generate an exception edge. | |
2153 bool ciTypeFlow::can_trap(ciBytecodeStream& str) { | |
2154 // Cf. GenerateOopMap::do_exception_edge. | |
2155 if (!Bytecodes::can_trap(str.cur_bc())) return false; | |
2156 | |
2157 switch (str.cur_bc()) { | |
1565 | 2158 // %%% FIXME: ldc of Class can generate an exception |
0 | 2159 case Bytecodes::_ldc: |
2160 case Bytecodes::_ldc_w: | |
2161 case Bytecodes::_ldc2_w: | |
2162 case Bytecodes::_aload_0: | |
2163 // These bytecodes can trap for rewriting. We need to assume that | |
2164 // they do not throw exceptions to make the monitor analysis work. | |
2165 return false; | |
2166 | |
2167 case Bytecodes::_ireturn: | |
2168 case Bytecodes::_lreturn: | |
2169 case Bytecodes::_freturn: | |
2170 case Bytecodes::_dreturn: | |
2171 case Bytecodes::_areturn: | |
2172 case Bytecodes::_return: | |
2173 // We can assume the monitor stack is empty in this analysis. | |
2174 return false; | |
2175 | |
2176 case Bytecodes::_monitorexit: | |
2177 // We can assume monitors are matched in this analysis. | |
2178 return false; | |
2179 } | |
2180 | |
2181 return true; | |
2182 } | |
2183 | |
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2184 // ------------------------------------------------------------------ |
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2185 // ciTypeFlow::clone_loop_heads |
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2186 // |
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2187 // Clone the loop heads |
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2188 bool ciTypeFlow::clone_loop_heads(Loop* lp, StateVector* temp_vector, JsrSet* temp_set) { |
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2189 bool rslt = false; |
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2190 for (PreorderLoops iter(loop_tree_root()); !iter.done(); iter.next()) { |
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2191 lp = iter.current(); |
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2192 Block* head = lp->head(); |
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2193 if (lp == loop_tree_root() || |
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2194 lp->is_irreducible() || |
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2195 !head->is_clonable_exit(lp)) |
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2196 continue; |
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|
2197 |
4777 | 2198 // Avoid BoxLock merge. |
2199 if (EliminateNestedLocks && head->has_monitorenter()) | |
2200 continue; | |
2201 | |
367
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2202 // check not already cloned |
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2203 if (head->backedge_copy_count() != 0) |
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|
2204 continue; |
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|
2205 |
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2206 // check _no_ shared head below us |
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|
2207 Loop* ch; |
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2208 for (ch = lp->child(); ch != NULL && ch->head() != head; ch = ch->sibling()); |
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2209 if (ch != NULL) |
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2210 continue; |
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2211 |
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2212 // Clone head |
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2213 Block* new_head = head->looping_succ(lp); |
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2214 Block* clone = clone_loop_head(lp, temp_vector, temp_set); |
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2215 // Update lp's info |
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2216 clone->set_loop(lp); |
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2217 lp->set_head(new_head); |
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2218 lp->set_tail(clone); |
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2219 // And move original head into outer loop |
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2220 head->set_loop(lp->parent()); |
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2221 |
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2222 rslt = true; |
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2223 } |
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2224 return rslt; |
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2225 } |
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2226 |
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2227 // ------------------------------------------------------------------ |
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|
2228 // ciTypeFlow::clone_loop_head |
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2229 // |
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2230 // Clone lp's head and replace tail's successors with clone. |
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2231 // |
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|
2232 // | |
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2233 // v |
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|
2234 // head <-> body |
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|
2235 // | |
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|
2236 // v |
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0
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|
2237 // exit |
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|
2238 // |
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|
2239 // new_head |
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|
2240 // |
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|
2241 // | |
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|
2242 // v |
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|
2243 // head ----------\ |
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|
2244 // | | |
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|
2245 // | v |
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|
2246 // | clone <-> body |
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|
2247 // | | |
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|
2248 // | /--/ |
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|
2249 // | | |
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|
2250 // v v |
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|
2251 // exit |
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|
2252 // |
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|
2253 ciTypeFlow::Block* ciTypeFlow::clone_loop_head(Loop* lp, StateVector* temp_vector, JsrSet* temp_set) { |
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2254 Block* head = lp->head(); |
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2255 Block* tail = lp->tail(); |
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2256 if (CITraceTypeFlow) { |
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|
2257 tty->print(">> Requesting clone of loop head "); head->print_value_on(tty); |
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2258 tty->print(" for predecessor "); tail->print_value_on(tty); |
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|
2259 tty->cr(); |
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|
2260 } |
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|
2261 Block* clone = block_at(head->start(), head->jsrs(), create_backedge_copy); |
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2262 assert(clone->backedge_copy_count() == 1, "one backedge copy for all back edges"); |
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|
2263 |
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|
2264 assert(!clone->has_pre_order(), "just created"); |
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|
2265 clone->set_next_pre_order(); |
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|
2266 |
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|
2267 // Insert clone after (orig) tail in reverse post order |
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|
2268 clone->set_rpo_next(tail->rpo_next()); |
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|
2269 tail->set_rpo_next(clone); |
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|
2270 |
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|
2271 // tail->head becomes tail->clone |
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|
2272 for (SuccIter iter(tail); !iter.done(); iter.next()) { |
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|
2273 if (iter.succ() == head) { |
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|
2274 iter.set_succ(clone); |
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|
2275 } |
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|
2276 } |
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|
2277 flow_block(tail, temp_vector, temp_set); |
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|
2278 if (head == tail) { |
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|
2279 // For self-loops, clone->head becomes clone->clone |
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|
2280 flow_block(clone, temp_vector, temp_set); |
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|
2281 for (SuccIter iter(clone); !iter.done(); iter.next()) { |
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|
2282 if (iter.succ() == head) { |
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|
2283 iter.set_succ(clone); |
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|
2284 break; |
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|
2285 } |
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|
2286 } |
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|
2287 } |
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|
2288 flow_block(clone, temp_vector, temp_set); |
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|
2289 |
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|
2290 return clone; |
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|
2291 } |
0 | 2292 |
2293 // ------------------------------------------------------------------ | |
2294 // ciTypeFlow::flow_block | |
2295 // | |
2296 // Interpret the effects of the bytecodes on the incoming state | |
2297 // vector of a basic block. Push the changed state to succeeding | |
2298 // basic blocks. | |
2299 void ciTypeFlow::flow_block(ciTypeFlow::Block* block, | |
2300 ciTypeFlow::StateVector* state, | |
2301 ciTypeFlow::JsrSet* jsrs) { | |
2302 if (CITraceTypeFlow) { | |
2303 tty->print("\n>> ANALYZING BLOCK : "); | |
2304 tty->cr(); | |
2305 block->print_on(tty); | |
2306 } | |
2307 assert(block->has_pre_order(), "pre-order is assigned before 1st flow"); | |
2308 | |
2309 int start = block->start(); | |
2310 int limit = block->limit(); | |
2311 int control = block->control(); | |
2312 if (control != ciBlock::fall_through_bci) { | |
2313 limit = control; | |
2314 } | |
2315 | |
2316 // Grab the state from the current block. | |
2317 block->copy_state_into(state); | |
367
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2318 state->def_locals()->clear(); |
0 | 2319 |
2320 GrowableArray<Block*>* exceptions = block->exceptions(); | |
2321 GrowableArray<ciInstanceKlass*>* exc_klasses = block->exc_klasses(); | |
2322 bool has_exceptions = exceptions->length() > 0; | |
2323 | |
367
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|
2324 bool exceptions_used = false; |
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2325 |
0 | 2326 ciBytecodeStream str(method()); |
2327 str.reset_to_bci(start); | |
2328 Bytecodes::Code code; | |
2329 while ((code = str.next()) != ciBytecodeStream::EOBC() && | |
2330 str.cur_bci() < limit) { | |
2331 // Check for exceptional control flow from this point. | |
2332 if (has_exceptions && can_trap(str)) { | |
2333 flow_exceptions(exceptions, exc_klasses, state); | |
367
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|
2334 exceptions_used = true; |
0 | 2335 } |
2336 // Apply the effects of the current bytecode to our state. | |
2337 bool res = state->apply_one_bytecode(&str); | |
2338 | |
2339 // Watch for bailouts. | |
2340 if (failing()) return; | |
2341 | |
4777 | 2342 if (str.cur_bc() == Bytecodes::_monitorenter) { |
2343 block->set_has_monitorenter(); | |
2344 } | |
2345 | |
0 | 2346 if (res) { |
2347 | |
2348 // We have encountered a trap. Record it in this block. | |
2349 block->set_trap(state->trap_bci(), state->trap_index()); | |
2350 | |
2351 if (CITraceTypeFlow) { | |
2352 tty->print_cr(">> Found trap"); | |
2353 block->print_on(tty); | |
2354 } | |
2355 | |
367
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|
2356 // Save set of locals defined in this block |
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|
2357 block->def_locals()->add(state->def_locals()); |
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|
2358 |
0 | 2359 // Record (no) successors. |
2360 block->successors(&str, state, jsrs); | |
2361 | |
367
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|
2362 assert(!has_exceptions || exceptions_used, "Not removing exceptions"); |
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|
2363 |
0 | 2364 // Discontinue interpretation of this Block. |
2365 return; | |
2366 } | |
2367 } | |
2368 | |
2369 GrowableArray<Block*>* successors = NULL; | |
2370 if (control != ciBlock::fall_through_bci) { | |
2371 // Check for exceptional control flow from this point. | |
2372 if (has_exceptions && can_trap(str)) { | |
2373 flow_exceptions(exceptions, exc_klasses, state); | |
367
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|
2374 exceptions_used = true; |
0 | 2375 } |
2376 | |
2377 // Fix the JsrSet to reflect effect of the bytecode. | |
2378 block->copy_jsrs_into(jsrs); | |
2379 jsrs->apply_control(this, &str, state); | |
2380 | |
2381 // Find successor edges based on old state and new JsrSet. | |
2382 successors = block->successors(&str, state, jsrs); | |
2383 | |
2384 // Apply the control changes to the state. | |
2385 state->apply_one_bytecode(&str); | |
2386 } else { | |
2387 // Fall through control | |
2388 successors = block->successors(&str, NULL, NULL); | |
2389 } | |
2390 | |
367
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|
2391 // Save set of locals defined in this block |
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|
2392 block->def_locals()->add(state->def_locals()); |
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|
2393 |
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6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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|
2394 // Remove untaken exception paths |
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|
2395 if (!exceptions_used) |
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diff
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|
2396 exceptions->clear(); |
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diff
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|
2397 |
0 | 2398 // Pass our state to successors. |
2399 flow_successors(successors, state); | |
2400 } | |
2401 | |
2402 // ------------------------------------------------------------------ | |
367
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|
2403 // ciTypeFlow::PostOrderLoops::next |
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|
2404 // |
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|
2405 // Advance to next loop tree using a postorder, left-to-right traversal. |
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6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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|
2406 void ciTypeFlow::PostorderLoops::next() { |
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|
2407 assert(!done(), "must not be done."); |
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|
2408 if (_current->sibling() != NULL) { |
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|
2409 _current = _current->sibling(); |
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|
2410 while (_current->child() != NULL) { |
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|
2411 _current = _current->child(); |
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|
2412 } |
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|
2413 } else { |
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|
2414 _current = _current->parent(); |
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|
2415 } |
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|
2416 } |
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|
2417 |
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|
2418 // ------------------------------------------------------------------ |
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|
2419 // ciTypeFlow::PreOrderLoops::next |
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|
2420 // |
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|
2421 // Advance to next loop tree using a preorder, left-to-right traversal. |
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6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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|
2422 void ciTypeFlow::PreorderLoops::next() { |
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|
2423 assert(!done(), "must not be done."); |
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|
2424 if (_current->child() != NULL) { |
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|
2425 _current = _current->child(); |
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|
2426 } else if (_current->sibling() != NULL) { |
194b8e3a2fc4
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|
2427 _current = _current->sibling(); |
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|
2428 } else { |
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0
diff
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|
2429 while (_current != _root && _current->sibling() == NULL) { |
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|
2430 _current = _current->parent(); |
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|
2431 } |
194b8e3a2fc4
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|
2432 if (_current == _root) { |
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|
2433 _current = NULL; |
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|
2434 assert(done(), "must be done."); |
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|
2435 } else { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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|
2436 assert(_current->sibling() != NULL, "must be more to do"); |
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|
2437 _current = _current->sibling(); |
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|
2438 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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|
2439 } |
194b8e3a2fc4
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|
2440 } |
194b8e3a2fc4
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|
2441 |
194b8e3a2fc4
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|
2442 // ------------------------------------------------------------------ |
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0
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|
2443 // ciTypeFlow::Loop::sorted_merge |
194b8e3a2fc4
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diff
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|
2444 // |
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diff
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|
2445 // Merge the branch lp into this branch, sorting on the loop head |
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|
2446 // pre_orders. Returns the leaf of the merged branch. |
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|
2447 // Child and sibling pointers will be setup later. |
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|
2448 // Sort is (looking from leaf towards the root) |
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|
2449 // descending on primary key: loop head's pre_order, and |
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|
2450 // ascending on secondary key: loop tail's pre_order. |
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|
2451 ciTypeFlow::Loop* ciTypeFlow::Loop::sorted_merge(Loop* lp) { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
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|
2452 Loop* leaf = this; |
194b8e3a2fc4
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|
2453 Loop* prev = NULL; |
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|
2454 Loop* current = leaf; |
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|
2455 while (lp != NULL) { |
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|
2456 int lp_pre_order = lp->head()->pre_order(); |
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diff
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|
2457 // Find insertion point for "lp" |
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|
2458 while (current != NULL) { |
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|
2459 if (current == lp) |
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|
2460 return leaf; // Already in list |
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0
diff
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|
2461 if (current->head()->pre_order() < lp_pre_order) |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2462 break; |
194b8e3a2fc4
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parents:
0
diff
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|
2463 if (current->head()->pre_order() == lp_pre_order && |
194b8e3a2fc4
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0
diff
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|
2464 current->tail()->pre_order() > lp->tail()->pre_order()) { |
194b8e3a2fc4
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parents:
0
diff
changeset
|
2465 break; |
194b8e3a2fc4
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parents:
0
diff
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|
2466 } |
194b8e3a2fc4
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parents:
0
diff
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|
2467 prev = current; |
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0
diff
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|
2468 current = current->parent(); |
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diff
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|
2469 } |
194b8e3a2fc4
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0
diff
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|
2470 Loop* next_lp = lp->parent(); // Save future list of items to insert |
194b8e3a2fc4
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parents:
0
diff
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|
2471 // Insert lp before current |
194b8e3a2fc4
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diff
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|
2472 lp->set_parent(current); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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diff
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|
2473 if (prev != NULL) { |
194b8e3a2fc4
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diff
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|
2474 prev->set_parent(lp); |
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0
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|
2475 } else { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
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|
2476 leaf = lp; |
194b8e3a2fc4
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0
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|
2477 } |
194b8e3a2fc4
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0
diff
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|
2478 prev = lp; // Inserted item is new prev[ious] |
194b8e3a2fc4
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parents:
0
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|
2479 lp = next_lp; // Next item to insert |
194b8e3a2fc4
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0
diff
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|
2480 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
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|
2481 return leaf; |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2482 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
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|
2483 |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
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|
2484 // ------------------------------------------------------------------ |
194b8e3a2fc4
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parents:
0
diff
changeset
|
2485 // ciTypeFlow::build_loop_tree |
194b8e3a2fc4
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parents:
0
diff
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|
2486 // |
194b8e3a2fc4
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0
diff
changeset
|
2487 // Incrementally build loop tree. |
194b8e3a2fc4
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never
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0
diff
changeset
|
2488 void ciTypeFlow::build_loop_tree(Block* blk) { |
194b8e3a2fc4
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0
diff
changeset
|
2489 assert(!blk->is_post_visited(), "precondition"); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
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|
2490 Loop* innermost = NULL; // merge of loop tree branches over all successors |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
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|
2491 |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
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0
diff
changeset
|
2492 for (SuccIter iter(blk); !iter.done(); iter.next()) { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2493 Loop* lp = NULL; |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2494 Block* succ = iter.succ(); |
194b8e3a2fc4
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0
diff
changeset
|
2495 if (!succ->is_post_visited()) { |
194b8e3a2fc4
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parents:
0
diff
changeset
|
2496 // Found backedge since predecessor post visited, but successor is not |
194b8e3a2fc4
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parents:
0
diff
changeset
|
2497 assert(succ->pre_order() <= blk->pre_order(), "should be backedge"); |
194b8e3a2fc4
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0
diff
changeset
|
2498 |
194b8e3a2fc4
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parents:
0
diff
changeset
|
2499 // Create a LoopNode to mark this loop. |
194b8e3a2fc4
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0
diff
changeset
|
2500 lp = new (arena()) Loop(succ, blk); |
194b8e3a2fc4
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0
diff
changeset
|
2501 if (succ->loop() == NULL) |
194b8e3a2fc4
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0
diff
changeset
|
2502 succ->set_loop(lp); |
194b8e3a2fc4
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0
diff
changeset
|
2503 // succ->loop will be updated to innermost loop on a later call, when blk==succ |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
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0
diff
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|
2504 |
194b8e3a2fc4
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0
diff
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|
2505 } else { // Nested loop |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2506 lp = succ->loop(); |
194b8e3a2fc4
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parents:
0
diff
changeset
|
2507 |
194b8e3a2fc4
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0
diff
changeset
|
2508 // If succ is loop head, find outer loop. |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2509 while (lp != NULL && lp->head() == succ) { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2510 lp = lp->parent(); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
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0
diff
changeset
|
2511 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2512 if (lp == NULL) { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2513 // Infinite loop, it's parent is the root |
194b8e3a2fc4
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0
diff
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|
2514 lp = loop_tree_root(); |
194b8e3a2fc4
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0
diff
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|
2515 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
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|
2516 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
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|
2517 |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
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|
2518 // Check for irreducible loop. |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2519 // Successor has already been visited. If the successor's loop head |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2520 // has already been post-visited, then this is another entry into the loop. |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
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|
2521 while (lp->head()->is_post_visited() && lp != loop_tree_root()) { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
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|
2522 _has_irreducible_entry = true; |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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diff
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|
2523 lp->set_irreducible(succ); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2524 if (!succ->is_on_work_list()) { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2525 // Assume irreducible entries need more data flow |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
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diff
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|
2526 add_to_work_list(succ); |
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6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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diff
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|
2527 } |
991 | 2528 Loop* plp = lp->parent(); |
2529 if (plp == NULL) { | |
2530 // This only happens for some irreducible cases. The parent | |
2531 // will be updated during a later pass. | |
2532 break; | |
2533 } | |
2534 lp = plp; | |
367
194b8e3a2fc4
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|
2535 } |
194b8e3a2fc4
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diff
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|
2536 |
194b8e3a2fc4
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|
2537 // Merge loop tree branch for all successors. |
194b8e3a2fc4
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diff
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|
2538 innermost = innermost == NULL ? lp : innermost->sorted_merge(lp); |
194b8e3a2fc4
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|
2539 |
194b8e3a2fc4
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|
2540 } // end loop |
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|
2541 |
194b8e3a2fc4
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0
diff
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|
2542 if (innermost == NULL) { |
194b8e3a2fc4
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diff
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|
2543 assert(blk->successors()->length() == 0, "CFG exit"); |
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|
2544 blk->set_loop(loop_tree_root()); |
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|
2545 } else if (innermost->head() == blk) { |
194b8e3a2fc4
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|
2546 // If loop header, complete the tree pointers |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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diff
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|
2547 if (blk->loop() != innermost) { |
194b8e3a2fc4
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diff
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|
2548 #if ASSERT |
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diff
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|
2549 assert(blk->loop()->head() == innermost->head(), "same head"); |
194b8e3a2fc4
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|
2550 Loop* dl; |
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|
2551 for (dl = innermost; dl != NULL && dl != blk->loop(); dl = dl->parent()); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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|
2552 assert(dl == blk->loop(), "blk->loop() already in innermost list"); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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diff
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|
2553 #endif |
194b8e3a2fc4
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0
diff
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|
2554 blk->set_loop(innermost); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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|
2555 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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|
2556 innermost->def_locals()->add(blk->def_locals()); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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diff
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|
2557 Loop* l = innermost; |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
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|
2558 Loop* p = l->parent(); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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diff
changeset
|
2559 while (p && l->head() == blk) { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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diff
changeset
|
2560 l->set_sibling(p->child()); // Put self on parents 'next child' |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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diff
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|
2561 p->set_child(l); // Make self the first child of parent |
194b8e3a2fc4
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|
2562 p->def_locals()->add(l->def_locals()); |
194b8e3a2fc4
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diff
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|
2563 l = p; // Walk up the parent chain |
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diff
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|
2564 p = l->parent(); |
194b8e3a2fc4
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|
2565 } |
194b8e3a2fc4
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0
diff
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|
2566 } else { |
194b8e3a2fc4
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diff
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|
2567 blk->set_loop(innermost); |
194b8e3a2fc4
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|
2568 innermost->def_locals()->add(blk->def_locals()); |
194b8e3a2fc4
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0
diff
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|
2569 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2570 } |
194b8e3a2fc4
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0
diff
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|
2571 |
194b8e3a2fc4
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0
diff
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|
2572 // ------------------------------------------------------------------ |
194b8e3a2fc4
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0
diff
changeset
|
2573 // ciTypeFlow::Loop::contains |
194b8e3a2fc4
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diff
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|
2574 // |
194b8e3a2fc4
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diff
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|
2575 // Returns true if lp is nested loop. |
194b8e3a2fc4
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diff
changeset
|
2576 bool ciTypeFlow::Loop::contains(ciTypeFlow::Loop* lp) const { |
194b8e3a2fc4
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diff
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|
2577 assert(lp != NULL, ""); |
194b8e3a2fc4
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diff
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|
2578 if (this == lp || head() == lp->head()) return true; |
194b8e3a2fc4
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0
diff
changeset
|
2579 int depth1 = depth(); |
194b8e3a2fc4
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0
diff
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|
2580 int depth2 = lp->depth(); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2581 if (depth1 > depth2) |
194b8e3a2fc4
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parents:
0
diff
changeset
|
2582 return false; |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2583 while (depth1 < depth2) { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2584 depth2--; |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2585 lp = lp->parent(); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2586 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2587 return this == lp; |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2588 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2589 |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2590 // ------------------------------------------------------------------ |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2591 // ciTypeFlow::Loop::depth |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2592 // |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2593 // Loop depth |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2594 int ciTypeFlow::Loop::depth() const { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2595 int dp = 0; |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2596 for (Loop* lp = this->parent(); lp != NULL; lp = lp->parent()) |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2597 dp++; |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2598 return dp; |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2599 } |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
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0
diff
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|
2600 |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2601 #ifndef PRODUCT |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2602 // ------------------------------------------------------------------ |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2603 // ciTypeFlow::Loop::print |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2604 void ciTypeFlow::Loop::print(outputStream* st, int indent) const { |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2605 for (int i = 0; i < indent; i++) st->print(" "); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2606 st->print("%d<-%d %s", |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2607 is_root() ? 0 : this->head()->pre_order(), |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2608 is_root() ? 0 : this->tail()->pre_order(), |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
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0
diff
changeset
|
2609 is_irreducible()?" irr":""); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
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0
diff
changeset
|
2610 st->print(" defs: "); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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parents:
0
diff
changeset
|
2611 def_locals()->print_on(st, _head->outer()->method()->max_locals()); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2612 st->cr(); |
194b8e3a2fc4
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0
diff
changeset
|
2613 for (Loop* ch = child(); ch != NULL; ch = ch->sibling()) |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
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0
diff
changeset
|
2614 ch->print(st, indent+2); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2615 } |
194b8e3a2fc4
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0
diff
changeset
|
2616 #endif |
194b8e3a2fc4
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0
diff
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|
2617 |
194b8e3a2fc4
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0
diff
changeset
|
2618 // ------------------------------------------------------------------ |
194b8e3a2fc4
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0
diff
changeset
|
2619 // ciTypeFlow::df_flow_types |
194b8e3a2fc4
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0
diff
changeset
|
2620 // |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2621 // Perform the depth first type flow analysis. Helper for flow_types. |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
never
parents:
0
diff
changeset
|
2622 void ciTypeFlow::df_flow_types(Block* start, |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2623 bool do_flow, |
194b8e3a2fc4
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0
diff
changeset
|
2624 StateVector* temp_vector, |
194b8e3a2fc4
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0
diff
changeset
|
2625 JsrSet* temp_set) { |
194b8e3a2fc4
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0
diff
changeset
|
2626 int dft_len = 100; |
1685 | 2627 GrowableArray<Block*> stk(dft_len); |
367
194b8e3a2fc4
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0
diff
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|
2628 |
194b8e3a2fc4
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0
diff
changeset
|
2629 ciBlock* dummy = _methodBlocks->make_dummy_block(); |
194b8e3a2fc4
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0
diff
changeset
|
2630 JsrSet* root_set = new JsrSet(NULL, 0); |
194b8e3a2fc4
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0
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changeset
|
2631 Block* root_head = new (arena()) Block(this, dummy, root_set); |
194b8e3a2fc4
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0
diff
changeset
|
2632 Block* root_tail = new (arena()) Block(this, dummy, root_set); |
194b8e3a2fc4
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0
diff
changeset
|
2633 root_head->set_pre_order(0); |
194b8e3a2fc4
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0
diff
changeset
|
2634 root_head->set_post_order(0); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2635 root_tail->set_pre_order(max_jint); |
194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
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0
diff
changeset
|
2636 root_tail->set_post_order(max_jint); |
194b8e3a2fc4
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2637 set_loop_tree_root(new (arena()) Loop(root_head, root_tail)); |
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2638 |
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2639 stk.push(start); |
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2640 |
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2641 _next_pre_order = 0; // initialize pre_order counter |
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2642 _rpo_list = NULL; |
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2643 int next_po = 0; // initialize post_order counter |
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|
2644 |
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2645 // Compute RPO and the control flow graph |
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2646 int size; |
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2647 while ((size = stk.length()) > 0) { |
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2648 Block* blk = stk.top(); // Leave node on stack |
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2649 if (!blk->is_visited()) { |
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2650 // forward arc in graph |
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2651 assert (!blk->has_pre_order(), ""); |
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2652 blk->set_next_pre_order(); |
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2653 |
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2654 if (_next_pre_order >= MaxNodeLimit / 2) { |
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2655 // Too many basic blocks. Bail out. |
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2656 // This can happen when try/finally constructs are nested to depth N, |
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2657 // and there is O(2**N) cloning of jsr bodies. See bug 4697245! |
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2658 // "MaxNodeLimit / 2" is used because probably the parser will |
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2659 // generate at least twice that many nodes and bail out. |
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2660 record_failure("too many basic blocks"); |
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2661 return; |
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2662 } |
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2663 if (do_flow) { |
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2664 flow_block(blk, temp_vector, temp_set); |
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2665 if (failing()) return; // Watch for bailouts. |
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2666 } |
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2667 } else if (!blk->is_post_visited()) { |
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|
2668 // cross or back arc |
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2669 for (SuccIter iter(blk); !iter.done(); iter.next()) { |
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2670 Block* succ = iter.succ(); |
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2671 if (!succ->is_visited()) { |
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2672 stk.push(succ); |
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2673 } |
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|
2674 } |
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2675 if (stk.length() == size) { |
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2676 // There were no additional children, post visit node now |
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2677 stk.pop(); // Remove node from stack |
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2678 |
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|
2679 build_loop_tree(blk); |
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2680 blk->set_post_order(next_po++); // Assign post order |
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|
2681 prepend_to_rpo_list(blk); |
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2682 assert(blk->is_post_visited(), ""); |
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|
2683 |
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2684 if (blk->is_loop_head() && !blk->is_on_work_list()) { |
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2685 // Assume loop heads need more data flow |
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|
2686 add_to_work_list(blk); |
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|
2687 } |
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|
2688 } |
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|
2689 } else { |
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|
2690 stk.pop(); // Remove post-visited node from stack |
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|
2691 } |
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|
2692 } |
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|
2693 } |
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|
2694 |
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|
2695 // ------------------------------------------------------------------ |
0 | 2696 // ciTypeFlow::flow_types |
2697 // | |
2698 // Perform the type flow analysis, creating and cloning Blocks as | |
2699 // necessary. | |
2700 void ciTypeFlow::flow_types() { | |
2701 ResourceMark rm; | |
2702 StateVector* temp_vector = new StateVector(this); | |
2703 JsrSet* temp_set = new JsrSet(NULL, 16); | |
2704 | |
2705 // Create the method entry block. | |
367
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2706 Block* start = block_at(start_bci(), temp_set); |
0 | 2707 |
2708 // Load the initial state into it. | |
2709 const StateVector* start_state = get_start_state(); | |
2710 if (failing()) return; | |
367
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2711 start->meet(start_state); |
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|
2712 |
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|
2713 // Depth first visit |
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2714 df_flow_types(start, true /*do flow*/, temp_vector, temp_set); |
0 | 2715 |
367
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2716 if (failing()) return; |
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2717 assert(_rpo_list == start, "must be start"); |
0 | 2718 |
367
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2719 // Any loops found? |
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2720 if (loop_tree_root()->child() != NULL && |
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|
2721 env()->comp_level() >= CompLevel_full_optimization) { |
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2722 // Loop optimizations are not performed on Tier1 compiles. |
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|
2723 |
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2724 bool changed = clone_loop_heads(loop_tree_root(), temp_vector, temp_set); |
0 | 2725 |
367
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2726 // If some loop heads were cloned, recompute postorder and loop tree |
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2727 if (changed) { |
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|
2728 loop_tree_root()->set_child(NULL); |
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2729 for (Block* blk = _rpo_list; blk != NULL;) { |
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2730 Block* next = blk->rpo_next(); |
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2731 blk->df_init(); |
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2732 blk = next; |
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|
2733 } |
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|
2734 df_flow_types(start, false /*no flow*/, temp_vector, temp_set); |
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2735 } |
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2736 } |
0 | 2737 |
367
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2738 if (CITraceTypeFlow) { |
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2739 tty->print_cr("\nLoop tree"); |
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|
2740 loop_tree_root()->print(); |
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|
2741 } |
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|
2742 |
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|
2743 // Continue flow analysis until fixed point reached |
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|
2744 |
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2745 debug_only(int max_block = _next_pre_order;) |
0 | 2746 |
367
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2747 while (!work_list_empty()) { |
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|
2748 Block* blk = work_list_next(); |
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|
2749 assert (blk->has_post_order(), "post order assigned above"); |
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|
2750 |
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|
2751 flow_block(blk, temp_vector, temp_set); |
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|
2752 |
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|
2753 assert (max_block == _next_pre_order, "no new blocks"); |
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|
2754 assert (!failing(), "no more bailouts"); |
0 | 2755 } |
2756 } | |
2757 | |
2758 // ------------------------------------------------------------------ | |
2759 // ciTypeFlow::map_blocks | |
2760 // | |
367
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|
2761 // Create the block map, which indexes blocks in reverse post-order. |
0 | 2762 void ciTypeFlow::map_blocks() { |
2763 assert(_block_map == NULL, "single initialization"); | |
367
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|
2764 int block_ct = _next_pre_order; |
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|
2765 _block_map = NEW_ARENA_ARRAY(arena(), Block*, block_ct); |
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|
2766 assert(block_ct == block_count(), ""); |
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|
2767 |
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2768 Block* blk = _rpo_list; |
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|
2769 for (int m = 0; m < block_ct; m++) { |
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|
2770 int rpo = blk->rpo(); |
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|
2771 assert(rpo == m, "should be sequential"); |
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|
2772 _block_map[rpo] = blk; |
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2773 blk = blk->rpo_next(); |
0 | 2774 } |
367
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|
2775 assert(blk == NULL, "should be done"); |
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|
2776 |
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2777 for (int j = 0; j < block_ct; j++) { |
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2778 assert(_block_map[j] != NULL, "must not drop any blocks"); |
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2779 Block* block = _block_map[j]; |
0 | 2780 // Remove dead blocks from successor lists: |
2781 for (int e = 0; e <= 1; e++) { | |
2782 GrowableArray<Block*>* l = e? block->exceptions(): block->successors(); | |
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2783 for (int k = 0; k < l->length(); k++) { |
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2784 Block* s = l->at(k); |
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2785 if (!s->has_post_order()) { |
0 | 2786 if (CITraceTypeFlow) { |
2787 tty->print("Removing dead %s successor of #%d: ", (e? "exceptional": "normal"), block->pre_order()); | |
2788 s->print_value_on(tty); | |
2789 tty->cr(); | |
2790 } | |
2791 l->remove(s); | |
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2792 --k; |
0 | 2793 } |
2794 } | |
2795 } | |
2796 } | |
2797 } | |
2798 | |
2799 // ------------------------------------------------------------------ | |
2800 // ciTypeFlow::get_block_for | |
2801 // | |
2802 // Find a block with this ciBlock which has a compatible JsrSet. | |
2803 // If no such block exists, create it, unless the option is no_create. | |
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2804 // If the option is create_backedge_copy, always create a fresh backedge copy. |
0 | 2805 ciTypeFlow::Block* ciTypeFlow::get_block_for(int ciBlockIndex, ciTypeFlow::JsrSet* jsrs, CreateOption option) { |
2806 Arena* a = arena(); | |
2807 GrowableArray<Block*>* blocks = _idx_to_blocklist[ciBlockIndex]; | |
2808 if (blocks == NULL) { | |
2809 // Query only? | |
2810 if (option == no_create) return NULL; | |
2811 | |
2812 // Allocate the growable array. | |
2813 blocks = new (a) GrowableArray<Block*>(a, 4, 0, NULL); | |
2814 _idx_to_blocklist[ciBlockIndex] = blocks; | |
2815 } | |
2816 | |
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2817 if (option != create_backedge_copy) { |
0 | 2818 int len = blocks->length(); |
2819 for (int i = 0; i < len; i++) { | |
2820 Block* block = blocks->at(i); | |
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2821 if (!block->is_backedge_copy() && block->is_compatible_with(jsrs)) { |
0 | 2822 return block; |
2823 } | |
2824 } | |
2825 } | |
2826 | |
2827 // Query only? | |
2828 if (option == no_create) return NULL; | |
2829 | |
2830 // We did not find a compatible block. Create one. | |
2831 Block* new_block = new (a) Block(this, _methodBlocks->block(ciBlockIndex), jsrs); | |
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2832 if (option == create_backedge_copy) new_block->set_backedge_copy(true); |
0 | 2833 blocks->append(new_block); |
2834 return new_block; | |
2835 } | |
2836 | |
2837 // ------------------------------------------------------------------ | |
367
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2838 // ciTypeFlow::backedge_copy_count |
0 | 2839 // |
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2840 int ciTypeFlow::backedge_copy_count(int ciBlockIndex, ciTypeFlow::JsrSet* jsrs) const { |
0 | 2841 GrowableArray<Block*>* blocks = _idx_to_blocklist[ciBlockIndex]; |
2842 | |
2843 if (blocks == NULL) { | |
2844 return 0; | |
2845 } | |
2846 | |
2847 int count = 0; | |
2848 int len = blocks->length(); | |
2849 for (int i = 0; i < len; i++) { | |
2850 Block* block = blocks->at(i); | |
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2851 if (block->is_backedge_copy() && block->is_compatible_with(jsrs)) { |
0 | 2852 count++; |
2853 } | |
2854 } | |
2855 | |
2856 return count; | |
2857 } | |
2858 | |
2859 // ------------------------------------------------------------------ | |
2860 // ciTypeFlow::do_flow | |
2861 // | |
2862 // Perform type inference flow analysis. | |
2863 void ciTypeFlow::do_flow() { | |
2864 if (CITraceTypeFlow) { | |
2865 tty->print_cr("\nPerforming flow analysis on method"); | |
2866 method()->print(); | |
2867 if (is_osr_flow()) tty->print(" at OSR bci %d", start_bci()); | |
2868 tty->cr(); | |
2869 method()->print_codes(); | |
2870 } | |
2871 if (CITraceTypeFlow) { | |
2872 tty->print_cr("Initial CI Blocks"); | |
2873 print_on(tty); | |
2874 } | |
2875 flow_types(); | |
2876 // Watch for bailouts. | |
2877 if (failing()) { | |
2878 return; | |
2879 } | |
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2880 |
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2881 map_blocks(); |
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2882 |
0 | 2883 if (CIPrintTypeFlow || CITraceTypeFlow) { |
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2884 rpo_print_on(tty); |
0 | 2885 } |
2886 } | |
2887 | |
2888 // ------------------------------------------------------------------ | |
2889 // ciTypeFlow::record_failure() | |
2890 // The ciTypeFlow object keeps track of failure reasons separately from the ciEnv. | |
2891 // This is required because there is not a 1-1 relation between the ciEnv and | |
2892 // the TypeFlow passes within a compilation task. For example, if the compiler | |
2893 // is considering inlining a method, it will request a TypeFlow. If that fails, | |
2894 // the compilation as a whole may continue without the inlining. Some TypeFlow | |
2895 // requests are not optional; if they fail the requestor is responsible for | |
2896 // copying the failure reason up to the ciEnv. (See Parse::Parse.) | |
2897 void ciTypeFlow::record_failure(const char* reason) { | |
2898 if (env()->log() != NULL) { | |
2899 env()->log()->elem("failure reason='%s' phase='typeflow'", reason); | |
2900 } | |
2901 if (_failure_reason == NULL) { | |
2902 // Record the first failure reason. | |
2903 _failure_reason = reason; | |
2904 } | |
2905 } | |
2906 | |
2907 #ifndef PRODUCT | |
2908 // ------------------------------------------------------------------ | |
2909 // ciTypeFlow::print_on | |
2910 void ciTypeFlow::print_on(outputStream* st) const { | |
2911 // Walk through CI blocks | |
2912 st->print_cr("********************************************************"); | |
2913 st->print ("TypeFlow for "); | |
2914 method()->name()->print_symbol_on(st); | |
2915 int limit_bci = code_size(); | |
2916 st->print_cr(" %d bytes", limit_bci); | |
2917 ciMethodBlocks *mblks = _methodBlocks; | |
2918 ciBlock* current = NULL; | |
2919 for (int bci = 0; bci < limit_bci; bci++) { | |
2920 ciBlock* blk = mblks->block_containing(bci); | |
2921 if (blk != NULL && blk != current) { | |
2922 current = blk; | |
2923 current->print_on(st); | |
2924 | |
2925 GrowableArray<Block*>* blocks = _idx_to_blocklist[blk->index()]; | |
2926 int num_blocks = (blocks == NULL) ? 0 : blocks->length(); | |
2927 | |
2928 if (num_blocks == 0) { | |
2929 st->print_cr(" No Blocks"); | |
2930 } else { | |
2931 for (int i = 0; i < num_blocks; i++) { | |
2932 Block* block = blocks->at(i); | |
2933 block->print_on(st); | |
2934 } | |
2935 } | |
2936 st->print_cr("--------------------------------------------------------"); | |
2937 st->cr(); | |
2938 } | |
2939 } | |
2940 st->print_cr("********************************************************"); | |
2941 st->cr(); | |
2942 } | |
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2943 |
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2944 void ciTypeFlow::rpo_print_on(outputStream* st) const { |
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2945 st->print_cr("********************************************************"); |
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2946 st->print ("TypeFlow for "); |
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2947 method()->name()->print_symbol_on(st); |
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2948 int limit_bci = code_size(); |
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2949 st->print_cr(" %d bytes", limit_bci); |
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2950 for (Block* blk = _rpo_list; blk != NULL; blk = blk->rpo_next()) { |
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2951 blk->print_on(st); |
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2952 st->print_cr("--------------------------------------------------------"); |
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2953 st->cr(); |
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2954 } |
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2955 st->print_cr("********************************************************"); |
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2956 st->cr(); |
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2957 } |
0 | 2958 #endif |