Mercurial > hg > truffle
annotate src/share/vm/c1/c1_Instruction.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 7a302948f5a4 |
| children | 37c18711a0df |
| rev | line source |
|---|---|
| 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 | |
| 37 Instruction::Condition Instruction::mirror(Condition cond) { | |
| 38 switch (cond) { | |
| 39 case eql: return eql; | |
| 40 case neq: return neq; | |
| 41 case lss: return gtr; | |
| 42 case leq: return geq; | |
| 43 case gtr: return lss; | |
| 44 case geq: return leq; | |
| 45 } | |
| 46 ShouldNotReachHere(); | |
| 47 return eql; | |
| 48 } | |
| 49 | |
| 50 | |
| 51 Instruction::Condition Instruction::negate(Condition cond) { | |
| 52 switch (cond) { | |
| 53 case eql: return neq; | |
| 54 case neq: return eql; | |
| 55 case lss: return geq; | |
| 56 case leq: return gtr; | |
| 57 case gtr: return leq; | |
| 58 case geq: return lss; | |
| 59 } | |
| 60 ShouldNotReachHere(); | |
| 61 return eql; | |
| 62 } | |
| 63 | |
| 1819 | 64 void Instruction::update_exception_state(ValueStack* state) { |
| 65 if (state != NULL && (state->kind() == ValueStack::EmptyExceptionState || state->kind() == ValueStack::ExceptionState)) { | |
| 66 assert(state->kind() == ValueStack::EmptyExceptionState || Compilation::current()->env()->jvmti_can_access_local_variables(), "unexpected state kind"); | |
| 67 _exception_state = state; | |
| 68 } else { | |
| 69 _exception_state = NULL; | |
| 70 } | |
| 71 } | |
| 72 | |
| 0 | 73 |
| 74 Instruction* Instruction::prev(BlockBegin* block) { | |
| 75 Instruction* p = NULL; | |
| 76 Instruction* q = block; | |
| 77 while (q != this) { | |
| 78 assert(q != NULL, "this is not in the block's instruction list"); | |
| 79 p = q; q = q->next(); | |
| 80 } | |
| 81 return p; | |
| 82 } | |
| 83 | |
| 84 | |
| 1819 | 85 void Instruction::state_values_do(ValueVisitor* f) { |
| 86 if (state_before() != NULL) { | |
| 87 state_before()->values_do(f); | |
| 88 } | |
| 89 if (exception_state() != NULL){ | |
| 90 exception_state()->values_do(f); | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 | |
| 0 | 95 #ifndef PRODUCT |
| 1819 | 96 void Instruction::check_state(ValueStack* state) { |
| 97 if (state != NULL) { | |
| 98 state->verify(); | |
| 99 } | |
| 100 } | |
| 101 | |
| 102 | |
| 0 | 103 void Instruction::print() { |
| 104 InstructionPrinter ip; | |
| 105 print(ip); | |
| 106 } | |
| 107 | |
| 108 | |
| 109 void Instruction::print_line() { | |
| 110 InstructionPrinter ip; | |
| 111 ip.print_line(this); | |
| 112 } | |
| 113 | |
| 114 | |
| 115 void Instruction::print(InstructionPrinter& ip) { | |
| 116 ip.print_head(); | |
| 117 ip.print_line(this); | |
| 118 tty->cr(); | |
| 119 } | |
| 120 #endif // PRODUCT | |
| 121 | |
| 122 | |
| 123 // perform constant and interval tests on index value | |
| 124 bool AccessIndexed::compute_needs_range_check() { | |
| 125 Constant* clength = length()->as_Constant(); | |
| 126 Constant* cindex = index()->as_Constant(); | |
| 127 if (clength && cindex) { | |
| 128 IntConstant* l = clength->type()->as_IntConstant(); | |
| 129 IntConstant* i = cindex->type()->as_IntConstant(); | |
| 130 if (l && i && i->value() < l->value() && i->value() >= 0) { | |
| 131 return false; | |
| 132 } | |
| 133 } | |
| 134 return true; | |
| 135 } | |
| 136 | |
| 137 | |
| 2446 | 138 ciType* Local::exact_type() const { |
| 139 ciType* type = declared_type(); | |
| 140 | |
| 141 // for primitive arrays, the declared type is the exact type | |
| 142 if (type->is_type_array_klass()) { | |
| 143 return type; | |
| 144 } else if (type->is_instance_klass()) { | |
| 145 ciInstanceKlass* ik = (ciInstanceKlass*)type; | |
| 146 if (ik->is_loaded() && ik->is_final() && !ik->is_interface()) { | |
| 147 return type; | |
| 148 } | |
| 149 } else if (type->is_obj_array_klass()) { | |
| 150 ciObjArrayKlass* oak = (ciObjArrayKlass*)type; | |
| 151 ciType* base = oak->base_element_type(); | |
| 152 if (base->is_instance_klass()) { | |
| 153 ciInstanceKlass* ik = base->as_instance_klass(); | |
| 154 if (ik->is_loaded() && ik->is_final()) { | |
| 155 return type; | |
| 156 } | |
| 157 } else if (base->is_primitive_type()) { | |
| 158 return type; | |
| 159 } | |
| 160 } | |
| 161 return NULL; | |
| 162 } | |
| 163 | |
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164 ciType* Constant::exact_type() const { |
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165 if (type()->is_object()) { |
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166 return type()->as_ObjectType()->exact_type(); |
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167 } |
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168 return NULL; |
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169 } |
| 2446 | 170 |
| 0 | 171 ciType* LoadIndexed::exact_type() const { |
| 172 ciType* array_type = array()->exact_type(); | |
| 173 if (array_type == NULL) { | |
| 174 return NULL; | |
| 175 } | |
| 176 assert(array_type->is_array_klass(), "what else?"); | |
| 177 ciArrayKlass* ak = (ciArrayKlass*)array_type; | |
| 178 | |
| 179 if (ak->element_type()->is_instance_klass()) { | |
| 180 ciInstanceKlass* ik = (ciInstanceKlass*)ak->element_type(); | |
| 181 if (ik->is_loaded() && ik->is_final()) { | |
| 182 return ik; | |
| 183 } | |
| 184 } | |
| 185 return NULL; | |
| 186 } | |
| 187 | |
| 188 | |
| 189 ciType* LoadIndexed::declared_type() const { | |
| 190 ciType* array_type = array()->declared_type(); | |
| 191 if (array_type == NULL) { | |
| 192 return NULL; | |
| 193 } | |
| 194 assert(array_type->is_array_klass(), "what else?"); | |
| 195 ciArrayKlass* ak = (ciArrayKlass*)array_type; | |
| 196 return ak->element_type(); | |
| 197 } | |
| 198 | |
| 199 | |
| 200 ciType* LoadField::declared_type() const { | |
| 201 return field()->type(); | |
| 202 } | |
| 203 | |
| 204 | |
| 205 ciType* LoadField::exact_type() const { | |
| 206 ciType* type = declared_type(); | |
| 207 // for primitive arrays, the declared type is the exact type | |
| 208 if (type->is_type_array_klass()) { | |
| 209 return type; | |
| 210 } | |
| 211 if (type->is_instance_klass()) { | |
| 212 ciInstanceKlass* ik = (ciInstanceKlass*)type; | |
| 213 if (ik->is_loaded() && ik->is_final()) { | |
| 214 return type; | |
| 215 } | |
| 216 } | |
| 217 return NULL; | |
| 218 } | |
| 219 | |
| 220 | |
| 221 ciType* NewTypeArray::exact_type() const { | |
| 222 return ciTypeArrayKlass::make(elt_type()); | |
| 223 } | |
| 224 | |
| 225 ciType* NewObjectArray::exact_type() const { | |
| 226 return ciObjArrayKlass::make(klass()); | |
| 227 } | |
| 228 | |
| 2446 | 229 ciType* NewArray::declared_type() const { |
| 230 return exact_type(); | |
| 231 } | |
| 0 | 232 |
| 233 ciType* NewInstance::exact_type() const { | |
| 234 return klass(); | |
| 235 } | |
| 236 | |
| 2446 | 237 ciType* NewInstance::declared_type() const { |
| 238 return exact_type(); | |
| 239 } | |
| 0 | 240 |
| 241 ciType* CheckCast::declared_type() const { | |
| 242 return klass(); | |
| 243 } | |
| 244 | |
| 245 ciType* CheckCast::exact_type() const { | |
| 246 if (klass()->is_instance_klass()) { | |
| 247 ciInstanceKlass* ik = (ciInstanceKlass*)klass(); | |
| 248 if (ik->is_loaded() && ik->is_final()) { | |
| 249 return ik; | |
| 250 } | |
| 251 } | |
| 252 return NULL; | |
| 253 } | |
| 254 | |
| 255 // Implementation of ArithmeticOp | |
| 256 | |
| 257 bool ArithmeticOp::is_commutative() const { | |
| 258 switch (op()) { | |
| 259 case Bytecodes::_iadd: // fall through | |
| 260 case Bytecodes::_ladd: // fall through | |
| 261 case Bytecodes::_fadd: // fall through | |
| 262 case Bytecodes::_dadd: // fall through | |
| 263 case Bytecodes::_imul: // fall through | |
| 264 case Bytecodes::_lmul: // fall through | |
| 265 case Bytecodes::_fmul: // fall through | |
| 266 case Bytecodes::_dmul: return true; | |
| 267 } | |
| 268 return false; | |
| 269 } | |
| 270 | |
| 271 | |
| 272 bool ArithmeticOp::can_trap() const { | |
| 273 switch (op()) { | |
| 274 case Bytecodes::_idiv: // fall through | |
| 275 case Bytecodes::_ldiv: // fall through | |
| 276 case Bytecodes::_irem: // fall through | |
| 277 case Bytecodes::_lrem: return true; | |
| 278 } | |
| 279 return false; | |
| 280 } | |
| 281 | |
| 282 | |
| 283 // Implementation of LogicOp | |
| 284 | |
| 285 bool LogicOp::is_commutative() const { | |
| 286 #ifdef ASSERT | |
| 287 switch (op()) { | |
| 288 case Bytecodes::_iand: // fall through | |
| 289 case Bytecodes::_land: // fall through | |
| 290 case Bytecodes::_ior : // fall through | |
| 291 case Bytecodes::_lor : // fall through | |
| 292 case Bytecodes::_ixor: // fall through | |
| 293 case Bytecodes::_lxor: break; | |
| 294 default : ShouldNotReachHere(); | |
| 295 } | |
| 296 #endif | |
| 297 // all LogicOps are commutative | |
| 298 return true; | |
| 299 } | |
| 300 | |
| 301 | |
| 302 // Implementation of IfOp | |
| 303 | |
| 304 bool IfOp::is_commutative() const { | |
| 305 return cond() == eql || cond() == neq; | |
| 306 } | |
| 307 | |
| 308 | |
| 309 // Implementation of StateSplit | |
| 310 | |
| 311 void StateSplit::substitute(BlockList& list, BlockBegin* old_block, BlockBegin* new_block) { | |
| 312 NOT_PRODUCT(bool assigned = false;) | |
| 313 for (int i = 0; i < list.length(); i++) { | |
| 314 BlockBegin** b = list.adr_at(i); | |
| 315 if (*b == old_block) { | |
| 316 *b = new_block; | |
| 317 NOT_PRODUCT(assigned = true;) | |
| 318 } | |
| 319 } | |
| 320 assert(assigned == true, "should have assigned at least once"); | |
| 321 } | |
| 322 | |
| 323 | |
| 324 IRScope* StateSplit::scope() const { | |
| 325 return _state->scope(); | |
| 326 } | |
| 327 | |
| 328 | |
| 1584 | 329 void StateSplit::state_values_do(ValueVisitor* f) { |
| 1819 | 330 Instruction::state_values_do(f); |
| 0 | 331 if (state() != NULL) state()->values_do(f); |
| 332 } | |
| 333 | |
| 334 | |
| 1584 | 335 void BlockBegin::state_values_do(ValueVisitor* f) { |
| 0 | 336 StateSplit::state_values_do(f); |
| 337 | |
| 338 if (is_set(BlockBegin::exception_entry_flag)) { | |
| 339 for (int i = 0; i < number_of_exception_states(); i++) { | |
| 340 exception_state_at(i)->values_do(f); | |
| 341 } | |
| 342 } | |
| 343 } | |
| 344 | |
| 345 | |
| 346 // Implementation of Invoke | |
| 347 | |
| 348 | |
| 349 Invoke::Invoke(Bytecodes::Code code, ValueType* result_type, Value recv, Values* args, | |
| 1295 | 350 int vtable_index, ciMethod* target, ValueStack* state_before) |
| 1819 | 351 : StateSplit(result_type, state_before) |
| 0 | 352 , _code(code) |
| 353 , _recv(recv) | |
| 354 , _args(args) | |
| 355 , _vtable_index(vtable_index) | |
| 356 , _target(target) | |
| 357 { | |
| 358 set_flag(TargetIsLoadedFlag, target->is_loaded()); | |
| 359 set_flag(TargetIsFinalFlag, target_is_loaded() && target->is_final_method()); | |
| 360 set_flag(TargetIsStrictfpFlag, target_is_loaded() && target->is_strict()); | |
| 361 | |
| 362 assert(args != NULL, "args must exist"); | |
| 363 #ifdef ASSERT | |
| 1584 | 364 AssertValues assert_value; |
| 365 values_do(&assert_value); | |
| 366 #endif | |
| 0 | 367 |
| 368 // provide an initial guess of signature size. | |
| 369 _signature = new BasicTypeList(number_of_arguments() + (has_receiver() ? 1 : 0)); | |
| 370 if (has_receiver()) { | |
| 371 _signature->append(as_BasicType(receiver()->type())); | |
| 372 } | |
| 373 for (int i = 0; i < number_of_arguments(); i++) { | |
| 374 ValueType* t = argument_at(i)->type(); | |
| 375 BasicType bt = as_BasicType(t); | |
| 376 _signature->append(bt); | |
| 377 } | |
| 378 } | |
| 379 | |
| 380 | |
| 1584 | 381 void Invoke::state_values_do(ValueVisitor* f) { |
| 1295 | 382 StateSplit::state_values_do(f); |
| 383 if (state_before() != NULL) state_before()->values_do(f); | |
| 384 if (state() != NULL) state()->values_do(f); | |
| 385 } | |
| 386 | |
| 2446 | 387 ciType* Invoke::declared_type() const { |
| 388 ciType *t = _target->signature()->return_type(); | |
| 389 assert(t->basic_type() != T_VOID, "need return value of void method?"); | |
| 390 return t; | |
| 391 } | |
| 1295 | 392 |
| 0 | 393 // Implementation of Contant |
| 394 intx Constant::hash() const { | |
| 1819 | 395 if (state_before() == NULL) { |
| 0 | 396 switch (type()->tag()) { |
| 397 case intTag: | |
| 398 return HASH2(name(), type()->as_IntConstant()->value()); | |
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399 case addressTag: |
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400 return HASH2(name(), type()->as_AddressConstant()->value()); |
| 0 | 401 case longTag: |
| 402 { | |
| 403 jlong temp = type()->as_LongConstant()->value(); | |
| 404 return HASH3(name(), high(temp), low(temp)); | |
| 405 } | |
| 406 case floatTag: | |
| 407 return HASH2(name(), jint_cast(type()->as_FloatConstant()->value())); | |
| 408 case doubleTag: | |
| 409 { | |
| 410 jlong temp = jlong_cast(type()->as_DoubleConstant()->value()); | |
| 411 return HASH3(name(), high(temp), low(temp)); | |
| 412 } | |
| 413 case objectTag: | |
| 414 assert(type()->as_ObjectType()->is_loaded(), "can't handle unloaded values"); | |
| 415 return HASH2(name(), type()->as_ObjectType()->constant_value()); | |
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416 case metaDataTag: |
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417 assert(type()->as_MetadataType()->is_loaded(), "can't handle unloaded values"); |
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418 return HASH2(name(), type()->as_MetadataType()->constant_value()); |
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419 default: |
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420 ShouldNotReachHere(); |
| 0 | 421 } |
| 422 } | |
| 423 return 0; | |
| 424 } | |
| 425 | |
| 426 bool Constant::is_equal(Value v) const { | |
| 427 if (v->as_Constant() == NULL) return false; | |
| 428 | |
| 429 switch (type()->tag()) { | |
| 430 case intTag: | |
| 431 { | |
| 432 IntConstant* t1 = type()->as_IntConstant(); | |
| 433 IntConstant* t2 = v->type()->as_IntConstant(); | |
| 434 return (t1 != NULL && t2 != NULL && | |
| 435 t1->value() == t2->value()); | |
| 436 } | |
| 437 case longTag: | |
| 438 { | |
| 439 LongConstant* t1 = type()->as_LongConstant(); | |
| 440 LongConstant* t2 = v->type()->as_LongConstant(); | |
| 441 return (t1 != NULL && t2 != NULL && | |
| 442 t1->value() == t2->value()); | |
| 443 } | |
| 444 case floatTag: | |
| 445 { | |
| 446 FloatConstant* t1 = type()->as_FloatConstant(); | |
| 447 FloatConstant* t2 = v->type()->as_FloatConstant(); | |
| 448 return (t1 != NULL && t2 != NULL && | |
| 449 jint_cast(t1->value()) == jint_cast(t2->value())); | |
| 450 } | |
| 451 case doubleTag: | |
| 452 { | |
| 453 DoubleConstant* t1 = type()->as_DoubleConstant(); | |
| 454 DoubleConstant* t2 = v->type()->as_DoubleConstant(); | |
| 455 return (t1 != NULL && t2 != NULL && | |
| 456 jlong_cast(t1->value()) == jlong_cast(t2->value())); | |
| 457 } | |
| 458 case objectTag: | |
| 459 { | |
| 460 ObjectType* t1 = type()->as_ObjectType(); | |
| 461 ObjectType* t2 = v->type()->as_ObjectType(); | |
| 462 return (t1 != NULL && t2 != NULL && | |
| 463 t1->is_loaded() && t2->is_loaded() && | |
| 464 t1->constant_value() == t2->constant_value()); | |
| 465 } | |
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466 case metaDataTag: |
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467 { |
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468 MetadataType* t1 = type()->as_MetadataType(); |
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469 MetadataType* t2 = v->type()->as_MetadataType(); |
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470 return (t1 != NULL && t2 != NULL && |
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471 t1->is_loaded() && t2->is_loaded() && |
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472 t1->constant_value() == t2->constant_value()); |
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473 } |
| 0 | 474 } |
| 475 return false; | |
| 476 } | |
| 477 | |
| 1899 | 478 Constant::CompareResult Constant::compare(Instruction::Condition cond, Value right) const { |
| 0 | 479 Constant* rc = right->as_Constant(); |
| 480 // other is not a constant | |
| 1899 | 481 if (rc == NULL) return not_comparable; |
| 0 | 482 |
| 483 ValueType* lt = type(); | |
| 484 ValueType* rt = rc->type(); | |
| 485 // different types | |
| 1899 | 486 if (lt->base() != rt->base()) return not_comparable; |
| 0 | 487 switch (lt->tag()) { |
| 488 case intTag: { | |
| 489 int x = lt->as_IntConstant()->value(); | |
| 490 int y = rt->as_IntConstant()->value(); | |
| 491 switch (cond) { | |
| 1899 | 492 case If::eql: return x == y ? cond_true : cond_false; |
| 493 case If::neq: return x != y ? cond_true : cond_false; | |
| 494 case If::lss: return x < y ? cond_true : cond_false; | |
| 495 case If::leq: return x <= y ? cond_true : cond_false; | |
| 496 case If::gtr: return x > y ? cond_true : cond_false; | |
| 497 case If::geq: return x >= y ? cond_true : cond_false; | |
| 0 | 498 } |
| 499 break; | |
| 500 } | |
| 501 case longTag: { | |
| 502 jlong x = lt->as_LongConstant()->value(); | |
| 503 jlong y = rt->as_LongConstant()->value(); | |
| 504 switch (cond) { | |
| 1899 | 505 case If::eql: return x == y ? cond_true : cond_false; |
| 506 case If::neq: return x != y ? cond_true : cond_false; | |
| 507 case If::lss: return x < y ? cond_true : cond_false; | |
| 508 case If::leq: return x <= y ? cond_true : cond_false; | |
| 509 case If::gtr: return x > y ? cond_true : cond_false; | |
| 510 case If::geq: return x >= y ? cond_true : cond_false; | |
| 0 | 511 } |
| 512 break; | |
| 513 } | |
| 514 case objectTag: { | |
| 515 ciObject* xvalue = lt->as_ObjectType()->constant_value(); | |
| 516 ciObject* yvalue = rt->as_ObjectType()->constant_value(); | |
| 517 assert(xvalue != NULL && yvalue != NULL, "not constants"); | |
| 518 if (xvalue->is_loaded() && yvalue->is_loaded()) { | |
| 519 switch (cond) { | |
| 1899 | 520 case If::eql: return xvalue == yvalue ? cond_true : cond_false; |
| 521 case If::neq: return xvalue != yvalue ? cond_true : cond_false; | |
| 0 | 522 } |
| 523 } | |
| 524 break; | |
| 525 } | |
|
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526 case metaDataTag: { |
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527 ciMetadata* xvalue = lt->as_MetadataType()->constant_value(); |
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528 ciMetadata* yvalue = rt->as_MetadataType()->constant_value(); |
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529 assert(xvalue != NULL && yvalue != NULL, "not constants"); |
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530 if (xvalue->is_loaded() && yvalue->is_loaded()) { |
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531 switch (cond) { |
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532 case If::eql: return xvalue == yvalue ? cond_true : cond_false; |
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533 case If::neq: return xvalue != yvalue ? cond_true : cond_false; |
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534 } |
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535 } |
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536 break; |
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537 } |
| 0 | 538 } |
| 1899 | 539 return not_comparable; |
| 0 | 540 } |
| 541 | |
| 542 | |
| 543 // Implementation of BlockBegin | |
| 544 | |
| 545 void BlockBegin::set_end(BlockEnd* end) { | |
| 546 assert(end != NULL, "should not reset block end to NULL"); | |
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547 if (end == _end) { |
| 0 | 548 return; |
| 549 } | |
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550 clear_end(); |
| 0 | 551 |
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552 // Set the new end |
| 0 | 553 _end = end; |
| 554 | |
| 555 _successors.clear(); | |
| 556 // Now reset successors list based on BlockEnd | |
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557 for (int i = 0; i < end->number_of_sux(); i++) { |
| 0 | 558 BlockBegin* sux = end->sux_at(i); |
| 559 _successors.append(sux); | |
| 560 sux->_predecessors.append(this); | |
| 561 } | |
| 562 _end->set_begin(this); | |
| 563 } | |
| 564 | |
| 565 | |
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566 void BlockBegin::clear_end() { |
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567 // Must make the predecessors/successors match up with the |
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568 // BlockEnd's notion. |
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569 if (_end != NULL) { |
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570 // disconnect from the old end |
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571 _end->set_begin(NULL); |
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572 |
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573 // disconnect this block from it's current successors |
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574 for (int i = 0; i < _successors.length(); i++) { |
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575 _successors.at(i)->remove_predecessor(this); |
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576 } |
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577 _end = NULL; |
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578 } |
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579 } |
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580 |
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581 |
| 0 | 582 void BlockBegin::disconnect_edge(BlockBegin* from, BlockBegin* to) { |
| 583 // disconnect any edges between from and to | |
| 584 #ifndef PRODUCT | |
| 585 if (PrintIR && Verbose) { | |
| 586 tty->print_cr("Disconnected edge B%d -> B%d", from->block_id(), to->block_id()); | |
| 587 } | |
| 588 #endif | |
| 589 for (int s = 0; s < from->number_of_sux();) { | |
| 590 BlockBegin* sux = from->sux_at(s); | |
| 591 if (sux == to) { | |
| 592 int index = sux->_predecessors.index_of(from); | |
| 593 if (index >= 0) { | |
| 594 sux->_predecessors.remove_at(index); | |
| 595 } | |
| 596 from->_successors.remove_at(s); | |
| 597 } else { | |
| 598 s++; | |
| 599 } | |
| 600 } | |
| 601 } | |
| 602 | |
| 603 | |
| 604 void BlockBegin::disconnect_from_graph() { | |
| 605 // disconnect this block from all other blocks | |
| 606 for (int p = 0; p < number_of_preds(); p++) { | |
| 607 pred_at(p)->remove_successor(this); | |
| 608 } | |
| 609 for (int s = 0; s < number_of_sux(); s++) { | |
| 610 sux_at(s)->remove_predecessor(this); | |
| 611 } | |
| 612 } | |
| 613 | |
| 614 void BlockBegin::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) { | |
| 615 // modify predecessors before substituting successors | |
| 616 for (int i = 0; i < number_of_sux(); i++) { | |
| 617 if (sux_at(i) == old_sux) { | |
| 618 // remove old predecessor before adding new predecessor | |
| 619 // otherwise there is a dead predecessor in the list | |
| 620 new_sux->remove_predecessor(old_sux); | |
| 621 new_sux->add_predecessor(this); | |
| 622 } | |
| 623 } | |
| 624 old_sux->remove_predecessor(this); | |
| 625 end()->substitute_sux(old_sux, new_sux); | |
| 626 } | |
| 627 | |
| 628 | |
| 629 | |
| 630 // In general it is not possible to calculate a value for the field "depth_first_number" | |
| 631 // of the inserted block, without recomputing the values of the other blocks | |
| 632 // in the CFG. Therefore the value of "depth_first_number" in BlockBegin becomes meaningless. | |
| 633 BlockBegin* BlockBegin::insert_block_between(BlockBegin* sux) { | |
| 3241 | 634 BlockBegin* new_sux = new BlockBegin(end()->state()->bci()); |
| 0 | 635 |
| 636 // mark this block (special treatment when block order is computed) | |
| 637 new_sux->set(critical_edge_split_flag); | |
| 638 | |
| 639 // This goto is not a safepoint. | |
| 640 Goto* e = new Goto(sux, false); | |
| 1819 | 641 new_sux->set_next(e, end()->state()->bci()); |
| 0 | 642 new_sux->set_end(e); |
| 643 // setup states | |
| 644 ValueStack* s = end()->state(); | |
| 645 new_sux->set_state(s->copy()); | |
| 646 e->set_state(s->copy()); | |
| 647 assert(new_sux->state()->locals_size() == s->locals_size(), "local size mismatch!"); | |
| 648 assert(new_sux->state()->stack_size() == s->stack_size(), "stack size mismatch!"); | |
| 649 assert(new_sux->state()->locks_size() == s->locks_size(), "locks size mismatch!"); | |
| 650 | |
| 651 // link predecessor to new block | |
| 652 end()->substitute_sux(sux, new_sux); | |
| 653 | |
| 654 // The ordering needs to be the same, so remove the link that the | |
| 655 // set_end call above added and substitute the new_sux for this | |
| 656 // block. | |
| 657 sux->remove_predecessor(new_sux); | |
| 658 | |
| 659 // the successor could be the target of a switch so it might have | |
| 660 // multiple copies of this predecessor, so substitute the new_sux | |
| 661 // for the first and delete the rest. | |
| 662 bool assigned = false; | |
| 663 BlockList& list = sux->_predecessors; | |
| 664 for (int i = 0; i < list.length(); i++) { | |
| 665 BlockBegin** b = list.adr_at(i); | |
| 666 if (*b == this) { | |
| 667 if (assigned) { | |
| 668 list.remove_at(i); | |
| 669 // reprocess this index | |
| 670 i--; | |
| 671 } else { | |
| 672 assigned = true; | |
| 673 *b = new_sux; | |
| 674 } | |
| 675 // link the new block back to it's predecessors. | |
| 676 new_sux->add_predecessor(this); | |
| 677 } | |
| 678 } | |
| 679 assert(assigned == true, "should have assigned at least once"); | |
| 680 return new_sux; | |
| 681 } | |
| 682 | |
| 683 | |
| 684 void BlockBegin::remove_successor(BlockBegin* pred) { | |
| 685 int idx; | |
| 686 while ((idx = _successors.index_of(pred)) >= 0) { | |
| 687 _successors.remove_at(idx); | |
| 688 } | |
| 689 } | |
| 690 | |
| 691 | |
| 692 void BlockBegin::add_predecessor(BlockBegin* pred) { | |
| 693 _predecessors.append(pred); | |
| 694 } | |
| 695 | |
| 696 | |
| 697 void BlockBegin::remove_predecessor(BlockBegin* pred) { | |
| 698 int idx; | |
| 699 while ((idx = _predecessors.index_of(pred)) >= 0) { | |
| 700 _predecessors.remove_at(idx); | |
| 701 } | |
| 702 } | |
| 703 | |
| 704 | |
| 705 void BlockBegin::add_exception_handler(BlockBegin* b) { | |
| 706 assert(b != NULL && (b->is_set(exception_entry_flag)), "exception handler must exist"); | |
| 707 // add only if not in the list already | |
| 708 if (!_exception_handlers.contains(b)) _exception_handlers.append(b); | |
| 709 } | |
| 710 | |
| 711 int BlockBegin::add_exception_state(ValueStack* state) { | |
| 712 assert(is_set(exception_entry_flag), "only for xhandlers"); | |
| 713 if (_exception_states == NULL) { | |
| 714 _exception_states = new ValueStackStack(4); | |
| 715 } | |
| 716 _exception_states->append(state); | |
| 717 return _exception_states->length() - 1; | |
| 718 } | |
| 719 | |
| 720 | |
| 721 void BlockBegin::iterate_preorder(boolArray& mark, BlockClosure* closure) { | |
| 722 if (!mark.at(block_id())) { | |
| 723 mark.at_put(block_id(), true); | |
| 724 closure->block_do(this); | |
| 725 BlockEnd* e = end(); // must do this after block_do because block_do may change it! | |
| 726 { for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_preorder(mark, closure); } | |
| 727 { for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_preorder(mark, closure); } | |
| 728 } | |
| 729 } | |
| 730 | |
| 731 | |
| 732 void BlockBegin::iterate_postorder(boolArray& mark, BlockClosure* closure) { | |
| 733 if (!mark.at(block_id())) { | |
| 734 mark.at_put(block_id(), true); | |
| 735 BlockEnd* e = end(); | |
| 736 { for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_postorder(mark, closure); } | |
| 737 { for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_postorder(mark, closure); } | |
| 738 closure->block_do(this); | |
| 739 } | |
| 740 } | |
| 741 | |
| 742 | |
| 743 void BlockBegin::iterate_preorder(BlockClosure* closure) { | |
| 744 boolArray mark(number_of_blocks(), false); | |
| 745 iterate_preorder(mark, closure); | |
| 746 } | |
| 747 | |
| 748 | |
| 749 void BlockBegin::iterate_postorder(BlockClosure* closure) { | |
| 750 boolArray mark(number_of_blocks(), false); | |
| 751 iterate_postorder(mark, closure); | |
| 752 } | |
| 753 | |
| 754 | |
| 1584 | 755 void BlockBegin::block_values_do(ValueVisitor* f) { |
| 0 | 756 for (Instruction* n = this; n != NULL; n = n->next()) n->values_do(f); |
| 757 } | |
| 758 | |
| 759 | |
| 760 #ifndef PRODUCT | |
| 1783 | 761 #define TRACE_PHI(code) if (PrintPhiFunctions) { code; } |
| 0 | 762 #else |
| 1783 | 763 #define TRACE_PHI(coce) |
| 0 | 764 #endif |
| 765 | |
| 766 | |
| 767 bool BlockBegin::try_merge(ValueStack* new_state) { | |
| 768 TRACE_PHI(tty->print_cr("********** try_merge for block B%d", block_id())); | |
| 769 | |
| 770 // local variables used for state iteration | |
| 771 int index; | |
| 772 Value new_value, existing_value; | |
| 773 | |
| 774 ValueStack* existing_state = state(); | |
| 775 if (existing_state == NULL) { | |
| 776 TRACE_PHI(tty->print_cr("first call of try_merge for this block")); | |
| 777 | |
| 778 if (is_set(BlockBegin::was_visited_flag)) { | |
| 779 // this actually happens for complicated jsr/ret structures | |
| 780 return false; // BAILOUT in caller | |
| 781 } | |
| 782 | |
| 783 // copy state because it is altered | |
| 1819 | 784 new_state = new_state->copy(ValueStack::BlockBeginState, bci()); |
| 0 | 785 |
| 786 // Use method liveness to invalidate dead locals | |
| 787 MethodLivenessResult liveness = new_state->scope()->method()->liveness_at_bci(bci()); | |
| 788 if (liveness.is_valid()) { | |
| 789 assert((int)liveness.size() == new_state->locals_size(), "error in use of liveness"); | |
| 790 | |
| 791 for_each_local_value(new_state, index, new_value) { | |
| 792 if (!liveness.at(index) || new_value->type()->is_illegal()) { | |
| 793 new_state->invalidate_local(index); | |
| 794 TRACE_PHI(tty->print_cr("invalidating dead local %d", index)); | |
| 795 } | |
| 796 } | |
| 797 } | |
| 798 | |
| 799 if (is_set(BlockBegin::parser_loop_header_flag)) { | |
| 800 TRACE_PHI(tty->print_cr("loop header block, initializing phi functions")); | |
| 801 | |
| 802 for_each_stack_value(new_state, index, new_value) { | |
| 803 new_state->setup_phi_for_stack(this, index); | |
| 804 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)); | |
| 805 } | |
| 806 | |
| 807 BitMap requires_phi_function = new_state->scope()->requires_phi_function(); | |
| 808 | |
| 809 for_each_local_value(new_state, index, new_value) { | |
| 810 bool requires_phi = requires_phi_function.at(index) || (new_value->type()->is_double_word() && requires_phi_function.at(index + 1)); | |
| 811 if (requires_phi || !SelectivePhiFunctions) { | |
| 812 new_state->setup_phi_for_local(this, index); | |
| 813 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)); | |
| 814 } | |
| 815 } | |
| 816 } | |
| 817 | |
| 818 // initialize state of block | |
| 819 set_state(new_state); | |
| 820 | |
| 1819 | 821 } else if (existing_state->is_same(new_state)) { |
| 0 | 822 TRACE_PHI(tty->print_cr("exisiting state found")); |
| 823 | |
| 824 assert(existing_state->scope() == new_state->scope(), "not matching"); | |
| 825 assert(existing_state->locals_size() == new_state->locals_size(), "not matching"); | |
| 826 assert(existing_state->stack_size() == new_state->stack_size(), "not matching"); | |
| 827 | |
| 828 if (is_set(BlockBegin::was_visited_flag)) { | |
| 829 TRACE_PHI(tty->print_cr("loop header block, phis must be present")); | |
| 830 | |
| 831 if (!is_set(BlockBegin::parser_loop_header_flag)) { | |
| 832 // this actually happens for complicated jsr/ret structures | |
| 833 return false; // BAILOUT in caller | |
| 834 } | |
| 835 | |
| 836 for_each_local_value(existing_state, index, existing_value) { | |
| 837 Value new_value = new_state->local_at(index); | |
| 838 if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) { | |
| 839 // The old code invalidated the phi function here | |
| 840 // Because dead locals are replaced with NULL, this is a very rare case now, so simply bail out | |
| 841 return false; // BAILOUT in caller | |
| 842 } | |
| 843 } | |
| 844 | |
| 845 #ifdef ASSERT | |
| 846 // check that all necessary phi functions are present | |
| 847 for_each_stack_value(existing_state, index, existing_value) { | |
| 848 assert(existing_value->as_Phi() != NULL && existing_value->as_Phi()->block() == this, "phi function required"); | |
| 849 } | |
| 850 for_each_local_value(existing_state, index, existing_value) { | |
| 851 assert(existing_value == new_state->local_at(index) || (existing_value->as_Phi() != NULL && existing_value->as_Phi()->as_Phi()->block() == this), "phi function required"); | |
| 852 } | |
| 853 #endif | |
| 854 | |
| 855 } else { | |
| 856 TRACE_PHI(tty->print_cr("creating phi functions on demand")); | |
| 857 | |
| 858 // create necessary phi functions for stack | |
| 859 for_each_stack_value(existing_state, index, existing_value) { | |
| 860 Value new_value = new_state->stack_at(index); | |
| 861 Phi* existing_phi = existing_value->as_Phi(); | |
| 862 | |
| 863 if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) { | |
| 864 existing_state->setup_phi_for_stack(this, index); | |
| 865 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)); | |
| 866 } | |
| 867 } | |
| 868 | |
| 869 // create necessary phi functions for locals | |
| 870 for_each_local_value(existing_state, index, existing_value) { | |
| 871 Value new_value = new_state->local_at(index); | |
| 872 Phi* existing_phi = existing_value->as_Phi(); | |
| 873 | |
| 874 if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) { | |
| 875 existing_state->invalidate_local(index); | |
| 876 TRACE_PHI(tty->print_cr("invalidating local %d because of type mismatch", index)); | |
| 877 } else if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) { | |
| 878 existing_state->setup_phi_for_local(this, index); | |
| 879 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)); | |
| 880 } | |
| 881 } | |
| 882 } | |
| 883 | |
| 884 assert(existing_state->caller_state() == new_state->caller_state(), "caller states must be equal"); | |
| 885 | |
| 886 } else { | |
| 887 assert(false, "stack or locks not matching (invalid bytecodes)"); | |
| 888 return false; | |
| 889 } | |
| 890 | |
| 891 TRACE_PHI(tty->print_cr("********** try_merge for block B%d successful", block_id())); | |
| 892 | |
| 893 return true; | |
| 894 } | |
| 895 | |
| 896 | |
| 897 #ifndef PRODUCT | |
| 898 void BlockBegin::print_block() { | |
| 899 InstructionPrinter ip; | |
| 900 print_block(ip, false); | |
| 901 } | |
| 902 | |
| 903 | |
| 904 void BlockBegin::print_block(InstructionPrinter& ip, bool live_only) { | |
| 905 ip.print_instr(this); tty->cr(); | |
| 906 ip.print_stack(this->state()); tty->cr(); | |
| 907 ip.print_inline_level(this); | |
| 908 ip.print_head(); | |
| 909 for (Instruction* n = next(); n != NULL; n = n->next()) { | |
| 910 if (!live_only || n->is_pinned() || n->use_count() > 0) { | |
| 911 ip.print_line(n); | |
| 912 } | |
| 913 } | |
| 914 tty->cr(); | |
| 915 } | |
| 916 #endif // PRODUCT | |
| 917 | |
| 918 | |
| 919 // Implementation of BlockList | |
| 920 | |
| 921 void BlockList::iterate_forward (BlockClosure* closure) { | |
| 922 const int l = length(); | |
| 923 for (int i = 0; i < l; i++) closure->block_do(at(i)); | |
| 924 } | |
| 925 | |
| 926 | |
| 927 void BlockList::iterate_backward(BlockClosure* closure) { | |
| 928 for (int i = length() - 1; i >= 0; i--) closure->block_do(at(i)); | |
| 929 } | |
| 930 | |
| 931 | |
| 932 void BlockList::blocks_do(void f(BlockBegin*)) { | |
| 933 for (int i = length() - 1; i >= 0; i--) f(at(i)); | |
| 934 } | |
| 935 | |
| 936 | |
| 1584 | 937 void BlockList::values_do(ValueVisitor* f) { |
| 0 | 938 for (int i = length() - 1; i >= 0; i--) at(i)->block_values_do(f); |
| 939 } | |
| 940 | |
| 941 | |
| 942 #ifndef PRODUCT | |
| 943 void BlockList::print(bool cfg_only, bool live_only) { | |
| 944 InstructionPrinter ip; | |
| 945 for (int i = 0; i < length(); i++) { | |
| 946 BlockBegin* block = at(i); | |
| 947 if (cfg_only) { | |
| 948 ip.print_instr(block); tty->cr(); | |
| 949 } else { | |
| 950 block->print_block(ip, live_only); | |
| 951 } | |
| 952 } | |
| 953 } | |
| 954 #endif // PRODUCT | |
| 955 | |
| 956 | |
| 957 // Implementation of BlockEnd | |
| 958 | |
| 959 void BlockEnd::set_begin(BlockBegin* begin) { | |
| 960 BlockList* sux = NULL; | |
| 961 if (begin != NULL) { | |
| 962 sux = begin->successors(); | |
| 963 } else if (_begin != NULL) { | |
| 964 // copy our sux list | |
| 965 BlockList* sux = new BlockList(_begin->number_of_sux()); | |
| 966 for (int i = 0; i < _begin->number_of_sux(); i++) { | |
| 967 sux->append(_begin->sux_at(i)); | |
| 968 } | |
| 969 } | |
| 970 _sux = sux; | |
| 971 _begin = begin; | |
| 972 } | |
| 973 | |
| 974 | |
| 975 void BlockEnd::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) { | |
| 976 substitute(*_sux, old_sux, new_sux); | |
| 977 } | |
| 978 | |
| 979 | |
| 980 // Implementation of Phi | |
| 981 | |
| 982 // Normal phi functions take their operands from the last instruction of the | |
| 983 // predecessor. Special handling is needed for xhanlder entries because there | |
| 984 // the state of arbitrary instructions are needed. | |
| 985 | |
| 986 Value Phi::operand_at(int i) const { | |
| 987 ValueStack* state; | |
| 988 if (_block->is_set(BlockBegin::exception_entry_flag)) { | |
| 989 state = _block->exception_state_at(i); | |
| 990 } else { | |
| 991 state = _block->pred_at(i)->end()->state(); | |
| 992 } | |
| 993 assert(state != NULL, ""); | |
| 994 | |
| 995 if (is_local()) { | |
| 996 return state->local_at(local_index()); | |
| 997 } else { | |
| 998 return state->stack_at(stack_index()); | |
| 999 } | |
| 1000 } | |
| 1001 | |
| 1002 | |
| 1003 int Phi::operand_count() const { | |
| 1004 if (_block->is_set(BlockBegin::exception_entry_flag)) { | |
| 1005 return _block->number_of_exception_states(); | |
| 1006 } else { | |
| 1007 return _block->number_of_preds(); | |
| 1008 } | |
| 1009 } | |
| 1010 | |
| 1011 | |
| 1783 | 1012 |
| 1013 void ProfileInvoke::state_values_do(ValueVisitor* f) { | |
| 1014 if (state() != NULL) state()->values_do(f); | |
| 1015 } |