Mercurial > hg > graal-compiler
annotate src/share/vm/c1/c1_Instruction.cpp @ 11809:c7769440afd8
improve NodeUtil.cloneNode.
author | Andreas Woess <andreas.woess@jku.at> |
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date | Wed, 25 Sep 2013 17:34:01 +0200 |
parents | 46f6f063b272 |
children | d13d7aba8c12 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "c1/c1_IR.hpp" | |
27 #include "c1/c1_Instruction.hpp" | |
28 #include "c1/c1_InstructionPrinter.hpp" | |
29 #include "c1/c1_ValueStack.hpp" | |
30 #include "ci/ciObjArrayKlass.hpp" | |
31 #include "ci/ciTypeArrayKlass.hpp" | |
0 | 32 |
33 | |
34 // Implementation of Instruction | |
35 | |
36 | |
8860 | 37 int Instruction::dominator_depth() { |
38 int result = -1; | |
39 if (block()) { | |
40 result = block()->dominator_depth(); | |
41 } | |
42 assert(result != -1 || this->as_Local(), "Only locals have dominator depth -1"); | |
43 return result; | |
44 } | |
45 | |
0 | 46 Instruction::Condition Instruction::mirror(Condition cond) { |
47 switch (cond) { | |
48 case eql: return eql; | |
49 case neq: return neq; | |
50 case lss: return gtr; | |
51 case leq: return geq; | |
52 case gtr: return lss; | |
53 case geq: return leq; | |
8860 | 54 case aeq: return beq; |
55 case beq: return aeq; | |
0 | 56 } |
57 ShouldNotReachHere(); | |
58 return eql; | |
59 } | |
60 | |
61 | |
62 Instruction::Condition Instruction::negate(Condition cond) { | |
63 switch (cond) { | |
64 case eql: return neq; | |
65 case neq: return eql; | |
66 case lss: return geq; | |
67 case leq: return gtr; | |
68 case gtr: return leq; | |
69 case geq: return lss; | |
8860 | 70 case aeq: assert(false, "Above equal cannot be negated"); |
71 case beq: assert(false, "Below equal cannot be negated"); | |
0 | 72 } |
73 ShouldNotReachHere(); | |
74 return eql; | |
75 } | |
76 | |
1819 | 77 void Instruction::update_exception_state(ValueStack* state) { |
78 if (state != NULL && (state->kind() == ValueStack::EmptyExceptionState || state->kind() == ValueStack::ExceptionState)) { | |
79 assert(state->kind() == ValueStack::EmptyExceptionState || Compilation::current()->env()->jvmti_can_access_local_variables(), "unexpected state kind"); | |
80 _exception_state = state; | |
81 } else { | |
82 _exception_state = NULL; | |
83 } | |
84 } | |
85 | |
8860 | 86 // Prev without need to have BlockBegin |
87 Instruction* Instruction::prev() { | |
0 | 88 Instruction* p = NULL; |
8860 | 89 Instruction* q = block(); |
0 | 90 while (q != this) { |
91 assert(q != NULL, "this is not in the block's instruction list"); | |
92 p = q; q = q->next(); | |
93 } | |
94 return p; | |
95 } | |
96 | |
97 | |
1819 | 98 void Instruction::state_values_do(ValueVisitor* f) { |
99 if (state_before() != NULL) { | |
100 state_before()->values_do(f); | |
101 } | |
102 if (exception_state() != NULL){ | |
103 exception_state()->values_do(f); | |
104 } | |
105 } | |
106 | |
107 | |
0 | 108 #ifndef PRODUCT |
1819 | 109 void Instruction::check_state(ValueStack* state) { |
110 if (state != NULL) { | |
111 state->verify(); | |
112 } | |
113 } | |
114 | |
115 | |
0 | 116 void Instruction::print() { |
117 InstructionPrinter ip; | |
118 print(ip); | |
119 } | |
120 | |
121 | |
122 void Instruction::print_line() { | |
123 InstructionPrinter ip; | |
124 ip.print_line(this); | |
125 } | |
126 | |
127 | |
128 void Instruction::print(InstructionPrinter& ip) { | |
129 ip.print_head(); | |
130 ip.print_line(this); | |
131 tty->cr(); | |
132 } | |
133 #endif // PRODUCT | |
134 | |
135 | |
136 // perform constant and interval tests on index value | |
137 bool AccessIndexed::compute_needs_range_check() { | |
8860 | 138 |
139 if (length()) { | |
140 | |
141 Constant* clength = length()->as_Constant(); | |
142 Constant* cindex = index()->as_Constant(); | |
143 if (clength && cindex) { | |
144 IntConstant* l = clength->type()->as_IntConstant(); | |
145 IntConstant* i = cindex->type()->as_IntConstant(); | |
146 if (l && i && i->value() < l->value() && i->value() >= 0) { | |
147 return false; | |
148 } | |
0 | 149 } |
150 } | |
8860 | 151 |
152 if (!this->check_flag(NeedsRangeCheckFlag)) { | |
153 return false; | |
154 } | |
155 | |
0 | 156 return true; |
157 } | |
158 | |
159 | |
2446 | 160 ciType* Local::exact_type() const { |
161 ciType* type = declared_type(); | |
162 | |
163 // for primitive arrays, the declared type is the exact type | |
164 if (type->is_type_array_klass()) { | |
165 return type; | |
166 } else if (type->is_instance_klass()) { | |
167 ciInstanceKlass* ik = (ciInstanceKlass*)type; | |
168 if (ik->is_loaded() && ik->is_final() && !ik->is_interface()) { | |
169 return type; | |
170 } | |
171 } else if (type->is_obj_array_klass()) { | |
172 ciObjArrayKlass* oak = (ciObjArrayKlass*)type; | |
173 ciType* base = oak->base_element_type(); | |
174 if (base->is_instance_klass()) { | |
175 ciInstanceKlass* ik = base->as_instance_klass(); | |
176 if (ik->is_loaded() && ik->is_final()) { | |
177 return type; | |
178 } | |
179 } else if (base->is_primitive_type()) { | |
180 return type; | |
181 } | |
182 } | |
183 return NULL; | |
184 } | |
185 | |
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186 ciType* Constant::exact_type() const { |
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187 if (type()->is_object()) { |
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188 return type()->as_ObjectType()->exact_type(); |
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189 } |
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190 return NULL; |
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191 } |
2446 | 192 |
0 | 193 ciType* LoadIndexed::exact_type() const { |
194 ciType* array_type = array()->exact_type(); | |
195 if (array_type == NULL) { | |
196 return NULL; | |
197 } | |
198 assert(array_type->is_array_klass(), "what else?"); | |
199 ciArrayKlass* ak = (ciArrayKlass*)array_type; | |
200 | |
201 if (ak->element_type()->is_instance_klass()) { | |
202 ciInstanceKlass* ik = (ciInstanceKlass*)ak->element_type(); | |
203 if (ik->is_loaded() && ik->is_final()) { | |
204 return ik; | |
205 } | |
206 } | |
207 return NULL; | |
208 } | |
209 | |
210 | |
211 ciType* LoadIndexed::declared_type() const { | |
212 ciType* array_type = array()->declared_type(); | |
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213 if (array_type == NULL || !array_type->is_loaded()) { |
0 | 214 return NULL; |
215 } | |
216 assert(array_type->is_array_klass(), "what else?"); | |
217 ciArrayKlass* ak = (ciArrayKlass*)array_type; | |
218 return ak->element_type(); | |
219 } | |
220 | |
221 | |
222 ciType* LoadField::declared_type() const { | |
223 return field()->type(); | |
224 } | |
225 | |
226 | |
227 ciType* LoadField::exact_type() const { | |
228 ciType* type = declared_type(); | |
229 // for primitive arrays, the declared type is the exact type | |
230 if (type->is_type_array_klass()) { | |
231 return type; | |
232 } | |
233 if (type->is_instance_klass()) { | |
234 ciInstanceKlass* ik = (ciInstanceKlass*)type; | |
235 if (ik->is_loaded() && ik->is_final()) { | |
236 return type; | |
237 } | |
238 } | |
239 return NULL; | |
240 } | |
241 | |
242 | |
243 ciType* NewTypeArray::exact_type() const { | |
244 return ciTypeArrayKlass::make(elt_type()); | |
245 } | |
246 | |
247 ciType* NewObjectArray::exact_type() const { | |
248 return ciObjArrayKlass::make(klass()); | |
249 } | |
250 | |
2446 | 251 ciType* NewArray::declared_type() const { |
252 return exact_type(); | |
253 } | |
0 | 254 |
255 ciType* NewInstance::exact_type() const { | |
256 return klass(); | |
257 } | |
258 | |
2446 | 259 ciType* NewInstance::declared_type() const { |
260 return exact_type(); | |
261 } | |
0 | 262 |
263 ciType* CheckCast::declared_type() const { | |
264 return klass(); | |
265 } | |
266 | |
267 ciType* CheckCast::exact_type() const { | |
268 if (klass()->is_instance_klass()) { | |
269 ciInstanceKlass* ik = (ciInstanceKlass*)klass(); | |
270 if (ik->is_loaded() && ik->is_final()) { | |
271 return ik; | |
272 } | |
273 } | |
274 return NULL; | |
275 } | |
276 | |
277 // Implementation of ArithmeticOp | |
278 | |
279 bool ArithmeticOp::is_commutative() const { | |
280 switch (op()) { | |
281 case Bytecodes::_iadd: // fall through | |
282 case Bytecodes::_ladd: // fall through | |
283 case Bytecodes::_fadd: // fall through | |
284 case Bytecodes::_dadd: // fall through | |
285 case Bytecodes::_imul: // fall through | |
286 case Bytecodes::_lmul: // fall through | |
287 case Bytecodes::_fmul: // fall through | |
288 case Bytecodes::_dmul: return true; | |
289 } | |
290 return false; | |
291 } | |
292 | |
293 | |
294 bool ArithmeticOp::can_trap() const { | |
295 switch (op()) { | |
296 case Bytecodes::_idiv: // fall through | |
297 case Bytecodes::_ldiv: // fall through | |
298 case Bytecodes::_irem: // fall through | |
299 case Bytecodes::_lrem: return true; | |
300 } | |
301 return false; | |
302 } | |
303 | |
304 | |
305 // Implementation of LogicOp | |
306 | |
307 bool LogicOp::is_commutative() const { | |
308 #ifdef ASSERT | |
309 switch (op()) { | |
310 case Bytecodes::_iand: // fall through | |
311 case Bytecodes::_land: // fall through | |
312 case Bytecodes::_ior : // fall through | |
313 case Bytecodes::_lor : // fall through | |
314 case Bytecodes::_ixor: // fall through | |
315 case Bytecodes::_lxor: break; | |
316 default : ShouldNotReachHere(); | |
317 } | |
318 #endif | |
319 // all LogicOps are commutative | |
320 return true; | |
321 } | |
322 | |
323 | |
324 // Implementation of IfOp | |
325 | |
326 bool IfOp::is_commutative() const { | |
327 return cond() == eql || cond() == neq; | |
328 } | |
329 | |
330 | |
331 // Implementation of StateSplit | |
332 | |
333 void StateSplit::substitute(BlockList& list, BlockBegin* old_block, BlockBegin* new_block) { | |
334 NOT_PRODUCT(bool assigned = false;) | |
335 for (int i = 0; i < list.length(); i++) { | |
336 BlockBegin** b = list.adr_at(i); | |
337 if (*b == old_block) { | |
338 *b = new_block; | |
339 NOT_PRODUCT(assigned = true;) | |
340 } | |
341 } | |
342 assert(assigned == true, "should have assigned at least once"); | |
343 } | |
344 | |
345 | |
346 IRScope* StateSplit::scope() const { | |
347 return _state->scope(); | |
348 } | |
349 | |
350 | |
1584 | 351 void StateSplit::state_values_do(ValueVisitor* f) { |
1819 | 352 Instruction::state_values_do(f); |
0 | 353 if (state() != NULL) state()->values_do(f); |
354 } | |
355 | |
356 | |
1584 | 357 void BlockBegin::state_values_do(ValueVisitor* f) { |
0 | 358 StateSplit::state_values_do(f); |
359 | |
360 if (is_set(BlockBegin::exception_entry_flag)) { | |
361 for (int i = 0; i < number_of_exception_states(); i++) { | |
362 exception_state_at(i)->values_do(f); | |
363 } | |
364 } | |
365 } | |
366 | |
367 | |
368 // Implementation of Invoke | |
369 | |
370 | |
371 Invoke::Invoke(Bytecodes::Code code, ValueType* result_type, Value recv, Values* args, | |
1295 | 372 int vtable_index, ciMethod* target, ValueStack* state_before) |
1819 | 373 : StateSplit(result_type, state_before) |
0 | 374 , _code(code) |
375 , _recv(recv) | |
376 , _args(args) | |
377 , _vtable_index(vtable_index) | |
378 , _target(target) | |
379 { | |
380 set_flag(TargetIsLoadedFlag, target->is_loaded()); | |
381 set_flag(TargetIsFinalFlag, target_is_loaded() && target->is_final_method()); | |
382 set_flag(TargetIsStrictfpFlag, target_is_loaded() && target->is_strict()); | |
383 | |
384 assert(args != NULL, "args must exist"); | |
385 #ifdef ASSERT | |
1584 | 386 AssertValues assert_value; |
387 values_do(&assert_value); | |
388 #endif | |
0 | 389 |
390 // provide an initial guess of signature size. | |
391 _signature = new BasicTypeList(number_of_arguments() + (has_receiver() ? 1 : 0)); | |
392 if (has_receiver()) { | |
393 _signature->append(as_BasicType(receiver()->type())); | |
394 } | |
395 for (int i = 0; i < number_of_arguments(); i++) { | |
396 ValueType* t = argument_at(i)->type(); | |
397 BasicType bt = as_BasicType(t); | |
398 _signature->append(bt); | |
399 } | |
400 } | |
401 | |
402 | |
1584 | 403 void Invoke::state_values_do(ValueVisitor* f) { |
1295 | 404 StateSplit::state_values_do(f); |
405 if (state_before() != NULL) state_before()->values_do(f); | |
406 if (state() != NULL) state()->values_do(f); | |
407 } | |
408 | |
2446 | 409 ciType* Invoke::declared_type() const { |
410 ciType *t = _target->signature()->return_type(); | |
411 assert(t->basic_type() != T_VOID, "need return value of void method?"); | |
412 return t; | |
413 } | |
1295 | 414 |
0 | 415 // Implementation of Contant |
416 intx Constant::hash() const { | |
1819 | 417 if (state_before() == NULL) { |
0 | 418 switch (type()->tag()) { |
419 case intTag: | |
420 return HASH2(name(), type()->as_IntConstant()->value()); | |
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421 case addressTag: |
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422 return HASH2(name(), type()->as_AddressConstant()->value()); |
0 | 423 case longTag: |
424 { | |
425 jlong temp = type()->as_LongConstant()->value(); | |
426 return HASH3(name(), high(temp), low(temp)); | |
427 } | |
428 case floatTag: | |
429 return HASH2(name(), jint_cast(type()->as_FloatConstant()->value())); | |
430 case doubleTag: | |
431 { | |
432 jlong temp = jlong_cast(type()->as_DoubleConstant()->value()); | |
433 return HASH3(name(), high(temp), low(temp)); | |
434 } | |
435 case objectTag: | |
436 assert(type()->as_ObjectType()->is_loaded(), "can't handle unloaded values"); | |
437 return HASH2(name(), type()->as_ObjectType()->constant_value()); | |
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438 case metaDataTag: |
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439 assert(type()->as_MetadataType()->is_loaded(), "can't handle unloaded values"); |
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440 return HASH2(name(), type()->as_MetadataType()->constant_value()); |
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441 default: |
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442 ShouldNotReachHere(); |
0 | 443 } |
444 } | |
445 return 0; | |
446 } | |
447 | |
448 bool Constant::is_equal(Value v) const { | |
449 if (v->as_Constant() == NULL) return false; | |
450 | |
451 switch (type()->tag()) { | |
452 case intTag: | |
453 { | |
454 IntConstant* t1 = type()->as_IntConstant(); | |
455 IntConstant* t2 = v->type()->as_IntConstant(); | |
456 return (t1 != NULL && t2 != NULL && | |
457 t1->value() == t2->value()); | |
458 } | |
459 case longTag: | |
460 { | |
461 LongConstant* t1 = type()->as_LongConstant(); | |
462 LongConstant* t2 = v->type()->as_LongConstant(); | |
463 return (t1 != NULL && t2 != NULL && | |
464 t1->value() == t2->value()); | |
465 } | |
466 case floatTag: | |
467 { | |
468 FloatConstant* t1 = type()->as_FloatConstant(); | |
469 FloatConstant* t2 = v->type()->as_FloatConstant(); | |
470 return (t1 != NULL && t2 != NULL && | |
471 jint_cast(t1->value()) == jint_cast(t2->value())); | |
472 } | |
473 case doubleTag: | |
474 { | |
475 DoubleConstant* t1 = type()->as_DoubleConstant(); | |
476 DoubleConstant* t2 = v->type()->as_DoubleConstant(); | |
477 return (t1 != NULL && t2 != NULL && | |
478 jlong_cast(t1->value()) == jlong_cast(t2->value())); | |
479 } | |
480 case objectTag: | |
481 { | |
482 ObjectType* t1 = type()->as_ObjectType(); | |
483 ObjectType* t2 = v->type()->as_ObjectType(); | |
484 return (t1 != NULL && t2 != NULL && | |
485 t1->is_loaded() && t2->is_loaded() && | |
486 t1->constant_value() == t2->constant_value()); | |
487 } | |
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488 case metaDataTag: |
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489 { |
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490 MetadataType* t1 = type()->as_MetadataType(); |
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491 MetadataType* t2 = v->type()->as_MetadataType(); |
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492 return (t1 != NULL && t2 != NULL && |
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493 t1->is_loaded() && t2->is_loaded() && |
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494 t1->constant_value() == t2->constant_value()); |
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495 } |
0 | 496 } |
497 return false; | |
498 } | |
499 | |
1899 | 500 Constant::CompareResult Constant::compare(Instruction::Condition cond, Value right) const { |
0 | 501 Constant* rc = right->as_Constant(); |
502 // other is not a constant | |
1899 | 503 if (rc == NULL) return not_comparable; |
0 | 504 |
505 ValueType* lt = type(); | |
506 ValueType* rt = rc->type(); | |
507 // different types | |
1899 | 508 if (lt->base() != rt->base()) return not_comparable; |
0 | 509 switch (lt->tag()) { |
510 case intTag: { | |
511 int x = lt->as_IntConstant()->value(); | |
512 int y = rt->as_IntConstant()->value(); | |
513 switch (cond) { | |
1899 | 514 case If::eql: return x == y ? cond_true : cond_false; |
515 case If::neq: return x != y ? cond_true : cond_false; | |
516 case If::lss: return x < y ? cond_true : cond_false; | |
517 case If::leq: return x <= y ? cond_true : cond_false; | |
518 case If::gtr: return x > y ? cond_true : cond_false; | |
519 case If::geq: return x >= y ? cond_true : cond_false; | |
0 | 520 } |
521 break; | |
522 } | |
523 case longTag: { | |
524 jlong x = lt->as_LongConstant()->value(); | |
525 jlong y = rt->as_LongConstant()->value(); | |
526 switch (cond) { | |
1899 | 527 case If::eql: return x == y ? cond_true : cond_false; |
528 case If::neq: return x != y ? cond_true : cond_false; | |
529 case If::lss: return x < y ? cond_true : cond_false; | |
530 case If::leq: return x <= y ? cond_true : cond_false; | |
531 case If::gtr: return x > y ? cond_true : cond_false; | |
532 case If::geq: return x >= y ? cond_true : cond_false; | |
0 | 533 } |
534 break; | |
535 } | |
536 case objectTag: { | |
537 ciObject* xvalue = lt->as_ObjectType()->constant_value(); | |
538 ciObject* yvalue = rt->as_ObjectType()->constant_value(); | |
539 assert(xvalue != NULL && yvalue != NULL, "not constants"); | |
540 if (xvalue->is_loaded() && yvalue->is_loaded()) { | |
541 switch (cond) { | |
1899 | 542 case If::eql: return xvalue == yvalue ? cond_true : cond_false; |
543 case If::neq: return xvalue != yvalue ? cond_true : cond_false; | |
0 | 544 } |
545 } | |
546 break; | |
547 } | |
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548 case metaDataTag: { |
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549 ciMetadata* xvalue = lt->as_MetadataType()->constant_value(); |
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550 ciMetadata* yvalue = rt->as_MetadataType()->constant_value(); |
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551 assert(xvalue != NULL && yvalue != NULL, "not constants"); |
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552 if (xvalue->is_loaded() && yvalue->is_loaded()) { |
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553 switch (cond) { |
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554 case If::eql: return xvalue == yvalue ? cond_true : cond_false; |
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555 case If::neq: return xvalue != yvalue ? cond_true : cond_false; |
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556 } |
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557 } |
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558 break; |
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559 } |
0 | 560 } |
1899 | 561 return not_comparable; |
0 | 562 } |
563 | |
564 | |
565 // Implementation of BlockBegin | |
566 | |
567 void BlockBegin::set_end(BlockEnd* end) { | |
568 assert(end != NULL, "should not reset block end to NULL"); | |
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569 if (end == _end) { |
0 | 570 return; |
571 } | |
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572 clear_end(); |
0 | 573 |
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574 // Set the new end |
0 | 575 _end = end; |
576 | |
577 _successors.clear(); | |
578 // Now reset successors list based on BlockEnd | |
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579 for (int i = 0; i < end->number_of_sux(); i++) { |
0 | 580 BlockBegin* sux = end->sux_at(i); |
581 _successors.append(sux); | |
582 sux->_predecessors.append(this); | |
583 } | |
584 _end->set_begin(this); | |
585 } | |
586 | |
587 | |
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588 void BlockBegin::clear_end() { |
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589 // Must make the predecessors/successors match up with the |
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590 // BlockEnd's notion. |
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591 if (_end != NULL) { |
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592 // disconnect from the old end |
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593 _end->set_begin(NULL); |
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594 |
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595 // disconnect this block from it's current successors |
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596 for (int i = 0; i < _successors.length(); i++) { |
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597 _successors.at(i)->remove_predecessor(this); |
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598 } |
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599 _end = NULL; |
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600 } |
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601 } |
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602 |
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603 |
0 | 604 void BlockBegin::disconnect_edge(BlockBegin* from, BlockBegin* to) { |
605 // disconnect any edges between from and to | |
606 #ifndef PRODUCT | |
607 if (PrintIR && Verbose) { | |
608 tty->print_cr("Disconnected edge B%d -> B%d", from->block_id(), to->block_id()); | |
609 } | |
610 #endif | |
611 for (int s = 0; s < from->number_of_sux();) { | |
612 BlockBegin* sux = from->sux_at(s); | |
613 if (sux == to) { | |
614 int index = sux->_predecessors.index_of(from); | |
615 if (index >= 0) { | |
616 sux->_predecessors.remove_at(index); | |
617 } | |
618 from->_successors.remove_at(s); | |
619 } else { | |
620 s++; | |
621 } | |
622 } | |
623 } | |
624 | |
625 | |
626 void BlockBegin::disconnect_from_graph() { | |
627 // disconnect this block from all other blocks | |
628 for (int p = 0; p < number_of_preds(); p++) { | |
629 pred_at(p)->remove_successor(this); | |
630 } | |
631 for (int s = 0; s < number_of_sux(); s++) { | |
632 sux_at(s)->remove_predecessor(this); | |
633 } | |
634 } | |
635 | |
636 void BlockBegin::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) { | |
637 // modify predecessors before substituting successors | |
638 for (int i = 0; i < number_of_sux(); i++) { | |
639 if (sux_at(i) == old_sux) { | |
640 // remove old predecessor before adding new predecessor | |
641 // otherwise there is a dead predecessor in the list | |
642 new_sux->remove_predecessor(old_sux); | |
643 new_sux->add_predecessor(this); | |
644 } | |
645 } | |
646 old_sux->remove_predecessor(this); | |
647 end()->substitute_sux(old_sux, new_sux); | |
648 } | |
649 | |
650 | |
651 | |
652 // In general it is not possible to calculate a value for the field "depth_first_number" | |
653 // of the inserted block, without recomputing the values of the other blocks | |
654 // in the CFG. Therefore the value of "depth_first_number" in BlockBegin becomes meaningless. | |
655 BlockBegin* BlockBegin::insert_block_between(BlockBegin* sux) { | |
8860 | 656 int bci = sux->bci(); |
657 // critical edge splitting may introduce a goto after a if and array | |
658 // bound check elimination may insert a predicate between the if and | |
659 // goto. The bci of the goto can't be the one of the if otherwise | |
660 // the state and bci are inconsistent and a deoptimization triggered | |
661 // by the predicate would lead to incorrect execution/a crash. | |
662 BlockBegin* new_sux = new BlockBegin(bci); | |
0 | 663 |
664 // mark this block (special treatment when block order is computed) | |
665 new_sux->set(critical_edge_split_flag); | |
666 | |
667 // This goto is not a safepoint. | |
668 Goto* e = new Goto(sux, false); | |
8860 | 669 new_sux->set_next(e, bci); |
0 | 670 new_sux->set_end(e); |
671 // setup states | |
672 ValueStack* s = end()->state(); | |
8860 | 673 new_sux->set_state(s->copy(s->kind(), bci)); |
674 e->set_state(s->copy(s->kind(), bci)); | |
0 | 675 assert(new_sux->state()->locals_size() == s->locals_size(), "local size mismatch!"); |
676 assert(new_sux->state()->stack_size() == s->stack_size(), "stack size mismatch!"); | |
677 assert(new_sux->state()->locks_size() == s->locks_size(), "locks size mismatch!"); | |
678 | |
679 // link predecessor to new block | |
680 end()->substitute_sux(sux, new_sux); | |
681 | |
682 // The ordering needs to be the same, so remove the link that the | |
683 // set_end call above added and substitute the new_sux for this | |
684 // block. | |
685 sux->remove_predecessor(new_sux); | |
686 | |
687 // the successor could be the target of a switch so it might have | |
688 // multiple copies of this predecessor, so substitute the new_sux | |
689 // for the first and delete the rest. | |
690 bool assigned = false; | |
691 BlockList& list = sux->_predecessors; | |
692 for (int i = 0; i < list.length(); i++) { | |
693 BlockBegin** b = list.adr_at(i); | |
694 if (*b == this) { | |
695 if (assigned) { | |
696 list.remove_at(i); | |
697 // reprocess this index | |
698 i--; | |
699 } else { | |
700 assigned = true; | |
701 *b = new_sux; | |
702 } | |
703 // link the new block back to it's predecessors. | |
704 new_sux->add_predecessor(this); | |
705 } | |
706 } | |
707 assert(assigned == true, "should have assigned at least once"); | |
708 return new_sux; | |
709 } | |
710 | |
711 | |
712 void BlockBegin::remove_successor(BlockBegin* pred) { | |
713 int idx; | |
714 while ((idx = _successors.index_of(pred)) >= 0) { | |
715 _successors.remove_at(idx); | |
716 } | |
717 } | |
718 | |
719 | |
720 void BlockBegin::add_predecessor(BlockBegin* pred) { | |
721 _predecessors.append(pred); | |
722 } | |
723 | |
724 | |
725 void BlockBegin::remove_predecessor(BlockBegin* pred) { | |
726 int idx; | |
727 while ((idx = _predecessors.index_of(pred)) >= 0) { | |
728 _predecessors.remove_at(idx); | |
729 } | |
730 } | |
731 | |
732 | |
733 void BlockBegin::add_exception_handler(BlockBegin* b) { | |
734 assert(b != NULL && (b->is_set(exception_entry_flag)), "exception handler must exist"); | |
735 // add only if not in the list already | |
736 if (!_exception_handlers.contains(b)) _exception_handlers.append(b); | |
737 } | |
738 | |
739 int BlockBegin::add_exception_state(ValueStack* state) { | |
740 assert(is_set(exception_entry_flag), "only for xhandlers"); | |
741 if (_exception_states == NULL) { | |
742 _exception_states = new ValueStackStack(4); | |
743 } | |
744 _exception_states->append(state); | |
745 return _exception_states->length() - 1; | |
746 } | |
747 | |
748 | |
749 void BlockBegin::iterate_preorder(boolArray& mark, BlockClosure* closure) { | |
750 if (!mark.at(block_id())) { | |
751 mark.at_put(block_id(), true); | |
752 closure->block_do(this); | |
753 BlockEnd* e = end(); // must do this after block_do because block_do may change it! | |
754 { for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_preorder(mark, closure); } | |
755 { for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_preorder(mark, closure); } | |
756 } | |
757 } | |
758 | |
759 | |
760 void BlockBegin::iterate_postorder(boolArray& mark, BlockClosure* closure) { | |
761 if (!mark.at(block_id())) { | |
762 mark.at_put(block_id(), true); | |
763 BlockEnd* e = end(); | |
764 { for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_postorder(mark, closure); } | |
765 { for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_postorder(mark, closure); } | |
766 closure->block_do(this); | |
767 } | |
768 } | |
769 | |
770 | |
771 void BlockBegin::iterate_preorder(BlockClosure* closure) { | |
772 boolArray mark(number_of_blocks(), false); | |
773 iterate_preorder(mark, closure); | |
774 } | |
775 | |
776 | |
777 void BlockBegin::iterate_postorder(BlockClosure* closure) { | |
778 boolArray mark(number_of_blocks(), false); | |
779 iterate_postorder(mark, closure); | |
780 } | |
781 | |
782 | |
1584 | 783 void BlockBegin::block_values_do(ValueVisitor* f) { |
0 | 784 for (Instruction* n = this; n != NULL; n = n->next()) n->values_do(f); |
785 } | |
786 | |
787 | |
788 #ifndef PRODUCT | |
1783 | 789 #define TRACE_PHI(code) if (PrintPhiFunctions) { code; } |
0 | 790 #else |
1783 | 791 #define TRACE_PHI(coce) |
0 | 792 #endif |
793 | |
794 | |
795 bool BlockBegin::try_merge(ValueStack* new_state) { | |
796 TRACE_PHI(tty->print_cr("********** try_merge for block B%d", block_id())); | |
797 | |
798 // local variables used for state iteration | |
799 int index; | |
800 Value new_value, existing_value; | |
801 | |
802 ValueStack* existing_state = state(); | |
803 if (existing_state == NULL) { | |
804 TRACE_PHI(tty->print_cr("first call of try_merge for this block")); | |
805 | |
806 if (is_set(BlockBegin::was_visited_flag)) { | |
807 // this actually happens for complicated jsr/ret structures | |
808 return false; // BAILOUT in caller | |
809 } | |
810 | |
811 // copy state because it is altered | |
1819 | 812 new_state = new_state->copy(ValueStack::BlockBeginState, bci()); |
0 | 813 |
814 // Use method liveness to invalidate dead locals | |
815 MethodLivenessResult liveness = new_state->scope()->method()->liveness_at_bci(bci()); | |
816 if (liveness.is_valid()) { | |
817 assert((int)liveness.size() == new_state->locals_size(), "error in use of liveness"); | |
818 | |
819 for_each_local_value(new_state, index, new_value) { | |
820 if (!liveness.at(index) || new_value->type()->is_illegal()) { | |
821 new_state->invalidate_local(index); | |
822 TRACE_PHI(tty->print_cr("invalidating dead local %d", index)); | |
823 } | |
824 } | |
825 } | |
826 | |
827 if (is_set(BlockBegin::parser_loop_header_flag)) { | |
828 TRACE_PHI(tty->print_cr("loop header block, initializing phi functions")); | |
829 | |
830 for_each_stack_value(new_state, index, new_value) { | |
831 new_state->setup_phi_for_stack(this, index); | |
832 TRACE_PHI(tty->print_cr("creating phi-function %c%d for stack %d", new_state->stack_at(index)->type()->tchar(), new_state->stack_at(index)->id(), index)); | |
833 } | |
834 | |
835 BitMap requires_phi_function = new_state->scope()->requires_phi_function(); | |
836 | |
837 for_each_local_value(new_state, index, new_value) { | |
838 bool requires_phi = requires_phi_function.at(index) || (new_value->type()->is_double_word() && requires_phi_function.at(index + 1)); | |
839 if (requires_phi || !SelectivePhiFunctions) { | |
840 new_state->setup_phi_for_local(this, index); | |
841 TRACE_PHI(tty->print_cr("creating phi-function %c%d for local %d", new_state->local_at(index)->type()->tchar(), new_state->local_at(index)->id(), index)); | |
842 } | |
843 } | |
844 } | |
845 | |
846 // initialize state of block | |
847 set_state(new_state); | |
848 | |
1819 | 849 } else if (existing_state->is_same(new_state)) { |
0 | 850 TRACE_PHI(tty->print_cr("exisiting state found")); |
851 | |
852 assert(existing_state->scope() == new_state->scope(), "not matching"); | |
853 assert(existing_state->locals_size() == new_state->locals_size(), "not matching"); | |
854 assert(existing_state->stack_size() == new_state->stack_size(), "not matching"); | |
855 | |
856 if (is_set(BlockBegin::was_visited_flag)) { | |
857 TRACE_PHI(tty->print_cr("loop header block, phis must be present")); | |
858 | |
859 if (!is_set(BlockBegin::parser_loop_header_flag)) { | |
860 // this actually happens for complicated jsr/ret structures | |
861 return false; // BAILOUT in caller | |
862 } | |
863 | |
864 for_each_local_value(existing_state, index, existing_value) { | |
865 Value new_value = new_state->local_at(index); | |
866 if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) { | |
867 // The old code invalidated the phi function here | |
868 // Because dead locals are replaced with NULL, this is a very rare case now, so simply bail out | |
869 return false; // BAILOUT in caller | |
870 } | |
871 } | |
872 | |
873 #ifdef ASSERT | |
874 // check that all necessary phi functions are present | |
875 for_each_stack_value(existing_state, index, existing_value) { | |
876 assert(existing_value->as_Phi() != NULL && existing_value->as_Phi()->block() == this, "phi function required"); | |
877 } | |
878 for_each_local_value(existing_state, index, existing_value) { | |
879 assert(existing_value == new_state->local_at(index) || (existing_value->as_Phi() != NULL && existing_value->as_Phi()->as_Phi()->block() == this), "phi function required"); | |
880 } | |
881 #endif | |
882 | |
883 } else { | |
884 TRACE_PHI(tty->print_cr("creating phi functions on demand")); | |
885 | |
886 // create necessary phi functions for stack | |
887 for_each_stack_value(existing_state, index, existing_value) { | |
888 Value new_value = new_state->stack_at(index); | |
889 Phi* existing_phi = existing_value->as_Phi(); | |
890 | |
891 if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) { | |
892 existing_state->setup_phi_for_stack(this, index); | |
893 TRACE_PHI(tty->print_cr("creating phi-function %c%d for stack %d", existing_state->stack_at(index)->type()->tchar(), existing_state->stack_at(index)->id(), index)); | |
894 } | |
895 } | |
896 | |
897 // create necessary phi functions for locals | |
898 for_each_local_value(existing_state, index, existing_value) { | |
899 Value new_value = new_state->local_at(index); | |
900 Phi* existing_phi = existing_value->as_Phi(); | |
901 | |
902 if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) { | |
903 existing_state->invalidate_local(index); | |
904 TRACE_PHI(tty->print_cr("invalidating local %d because of type mismatch", index)); | |
905 } else if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) { | |
906 existing_state->setup_phi_for_local(this, index); | |
907 TRACE_PHI(tty->print_cr("creating phi-function %c%d for local %d", existing_state->local_at(index)->type()->tchar(), existing_state->local_at(index)->id(), index)); | |
908 } | |
909 } | |
910 } | |
911 | |
912 assert(existing_state->caller_state() == new_state->caller_state(), "caller states must be equal"); | |
913 | |
914 } else { | |
915 assert(false, "stack or locks not matching (invalid bytecodes)"); | |
916 return false; | |
917 } | |
918 | |
919 TRACE_PHI(tty->print_cr("********** try_merge for block B%d successful", block_id())); | |
920 | |
921 return true; | |
922 } | |
923 | |
924 | |
925 #ifndef PRODUCT | |
926 void BlockBegin::print_block() { | |
927 InstructionPrinter ip; | |
928 print_block(ip, false); | |
929 } | |
930 | |
931 | |
932 void BlockBegin::print_block(InstructionPrinter& ip, bool live_only) { | |
933 ip.print_instr(this); tty->cr(); | |
934 ip.print_stack(this->state()); tty->cr(); | |
935 ip.print_inline_level(this); | |
936 ip.print_head(); | |
937 for (Instruction* n = next(); n != NULL; n = n->next()) { | |
938 if (!live_only || n->is_pinned() || n->use_count() > 0) { | |
939 ip.print_line(n); | |
940 } | |
941 } | |
942 tty->cr(); | |
943 } | |
944 #endif // PRODUCT | |
945 | |
946 | |
947 // Implementation of BlockList | |
948 | |
949 void BlockList::iterate_forward (BlockClosure* closure) { | |
950 const int l = length(); | |
951 for (int i = 0; i < l; i++) closure->block_do(at(i)); | |
952 } | |
953 | |
954 | |
955 void BlockList::iterate_backward(BlockClosure* closure) { | |
956 for (int i = length() - 1; i >= 0; i--) closure->block_do(at(i)); | |
957 } | |
958 | |
959 | |
960 void BlockList::blocks_do(void f(BlockBegin*)) { | |
961 for (int i = length() - 1; i >= 0; i--) f(at(i)); | |
962 } | |
963 | |
964 | |
1584 | 965 void BlockList::values_do(ValueVisitor* f) { |
0 | 966 for (int i = length() - 1; i >= 0; i--) at(i)->block_values_do(f); |
967 } | |
968 | |
969 | |
970 #ifndef PRODUCT | |
971 void BlockList::print(bool cfg_only, bool live_only) { | |
972 InstructionPrinter ip; | |
973 for (int i = 0; i < length(); i++) { | |
974 BlockBegin* block = at(i); | |
975 if (cfg_only) { | |
976 ip.print_instr(block); tty->cr(); | |
977 } else { | |
978 block->print_block(ip, live_only); | |
979 } | |
980 } | |
981 } | |
982 #endif // PRODUCT | |
983 | |
984 | |
985 // Implementation of BlockEnd | |
986 | |
987 void BlockEnd::set_begin(BlockBegin* begin) { | |
988 BlockList* sux = NULL; | |
989 if (begin != NULL) { | |
990 sux = begin->successors(); | |
8860 | 991 } else if (this->begin() != NULL) { |
0 | 992 // copy our sux list |
8860 | 993 BlockList* sux = new BlockList(this->begin()->number_of_sux()); |
994 for (int i = 0; i < this->begin()->number_of_sux(); i++) { | |
995 sux->append(this->begin()->sux_at(i)); | |
0 | 996 } |
997 } | |
998 _sux = sux; | |
999 } | |
1000 | |
1001 | |
1002 void BlockEnd::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) { | |
1003 substitute(*_sux, old_sux, new_sux); | |
1004 } | |
1005 | |
1006 | |
1007 // Implementation of Phi | |
1008 | |
1009 // Normal phi functions take their operands from the last instruction of the | |
1010 // predecessor. Special handling is needed for xhanlder entries because there | |
1011 // the state of arbitrary instructions are needed. | |
1012 | |
1013 Value Phi::operand_at(int i) const { | |
1014 ValueStack* state; | |
1015 if (_block->is_set(BlockBegin::exception_entry_flag)) { | |
1016 state = _block->exception_state_at(i); | |
1017 } else { | |
1018 state = _block->pred_at(i)->end()->state(); | |
1019 } | |
1020 assert(state != NULL, ""); | |
1021 | |
1022 if (is_local()) { | |
1023 return state->local_at(local_index()); | |
1024 } else { | |
1025 return state->stack_at(stack_index()); | |
1026 } | |
1027 } | |
1028 | |
1029 | |
1030 int Phi::operand_count() const { | |
1031 if (_block->is_set(BlockBegin::exception_entry_flag)) { | |
1032 return _block->number_of_exception_states(); | |
1033 } else { | |
1034 return _block->number_of_preds(); | |
1035 } | |
1036 } | |
1037 | |
8860 | 1038 #ifdef ASSERT |
1039 // Constructor of Assert | |
1040 Assert::Assert(Value x, Condition cond, bool unordered_is_true, Value y) : Instruction(illegalType) | |
1041 , _x(x) | |
1042 , _cond(cond) | |
1043 , _y(y) | |
1044 { | |
1045 set_flag(UnorderedIsTrueFlag, unordered_is_true); | |
1046 assert(x->type()->tag() == y->type()->tag(), "types must match"); | |
1047 pin(); | |
0 | 1048 |
8860 | 1049 stringStream strStream; |
1050 Compilation::current()->method()->print_name(&strStream); | |
1051 | |
1052 stringStream strStream1; | |
1053 InstructionPrinter ip1(1, &strStream1); | |
1054 ip1.print_instr(x); | |
1055 | |
1056 stringStream strStream2; | |
1057 InstructionPrinter ip2(1, &strStream2); | |
1058 ip2.print_instr(y); | |
1059 | |
1060 stringStream ss; | |
1061 ss.print("Assertion %s %s %s in method %s", strStream1.as_string(), ip2.cond_name(cond), strStream2.as_string(), strStream.as_string()); | |
1062 | |
1063 _message = ss.as_string(); | |
1064 } | |
1065 #endif | |
1066 | |
1067 void RangeCheckPredicate::check_state() { | |
1068 assert(state()->kind() != ValueStack::EmptyExceptionState && state()->kind() != ValueStack::ExceptionState, "will deopt with empty state"); | |
1069 } | |
1783 | 1070 |
1071 void ProfileInvoke::state_values_do(ValueVisitor* f) { | |
1072 if (state() != NULL) state()->values_do(f); | |
1073 } |