Mercurial > hg > graal-compiler
annotate src/share/vm/ci/ciTypeFlow.cpp @ 1685:0e35fa8ebccd
6973963: SEGV in ciBlock::start_bci() with EA
Summary: Added more checks into ResourceObj and growableArray to verify correctness of allocation type.
Reviewed-by: never, coleenp, dholmes
| author | kvn |
|---|---|
| date | Tue, 03 Aug 2010 15:55:03 -0700 |
| parents | b918d354830a |
| children | d55217dc206f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1579 | 2 * Copyright (c) 2000, 2010, 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 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_ciTypeFlow.cpp.incl" | |
| 27 | |
| 28 // ciTypeFlow::JsrSet | |
| 29 // | |
| 30 // A JsrSet represents some set of JsrRecords. This class | |
| 31 // is used to record a set of all jsr routines which we permit | |
| 32 // execution to return (ret) from. | |
| 33 // | |
| 34 // During abstract interpretation, JsrSets are used to determine | |
| 35 // whether two paths which reach a given block are unique, and | |
| 36 // should be cloned apart, or are compatible, and should merge | |
| 37 // together. | |
| 38 | |
| 39 // ------------------------------------------------------------------ | |
| 40 // ciTypeFlow::JsrSet::JsrSet | |
| 41 ciTypeFlow::JsrSet::JsrSet(Arena* arena, int default_len) { | |
| 42 if (arena != NULL) { | |
| 43 // Allocate growable array in Arena. | |
| 44 _set = new (arena) GrowableArray<JsrRecord*>(arena, default_len, 0, NULL); | |
| 45 } else { | |
| 46 // Allocate growable array in current ResourceArea. | |
| 47 _set = new GrowableArray<JsrRecord*>(4, 0, NULL, false); | |
| 48 } | |
| 49 } | |
| 50 | |
| 51 // ------------------------------------------------------------------ | |
| 52 // ciTypeFlow::JsrSet::copy_into | |
| 53 void ciTypeFlow::JsrSet::copy_into(JsrSet* jsrs) { | |
| 54 int len = size(); | |
| 55 jsrs->_set->clear(); | |
| 56 for (int i = 0; i < len; i++) { | |
| 57 jsrs->_set->append(_set->at(i)); | |
| 58 } | |
| 59 } | |
| 60 | |
| 61 // ------------------------------------------------------------------ | |
| 62 // ciTypeFlow::JsrSet::is_compatible_with | |
| 63 // | |
| 64 // !!!! MISGIVINGS ABOUT THIS... disregard | |
| 65 // | |
| 66 // Is this JsrSet compatible with some other JsrSet? | |
| 67 // | |
| 68 // In set-theoretic terms, a JsrSet can be viewed as a partial function | |
| 69 // from entry addresses to return addresses. Two JsrSets A and B are | |
| 70 // compatible iff | |
| 71 // | |
| 72 // For any x, | |
| 73 // A(x) defined and B(x) defined implies A(x) == B(x) | |
| 74 // | |
| 75 // Less formally, two JsrSets are compatible when they have identical | |
| 76 // return addresses for any entry addresses they share in common. | |
| 77 bool ciTypeFlow::JsrSet::is_compatible_with(JsrSet* other) { | |
| 78 // Walk through both sets in parallel. If the same entry address | |
| 79 // appears in both sets, then the return address must match for | |
| 80 // the sets to be compatible. | |
| 81 int size1 = size(); | |
| 82 int size2 = other->size(); | |
| 83 | |
| 84 // Special case. If nothing is on the jsr stack, then there can | |
| 85 // be no ret. | |
| 86 if (size2 == 0) { | |
| 87 return true; | |
| 88 } else if (size1 != size2) { | |
| 89 return false; | |
| 90 } else { | |
| 91 for (int i = 0; i < size1; i++) { | |
| 92 JsrRecord* record1 = record_at(i); | |
| 93 JsrRecord* record2 = other->record_at(i); | |
| 94 if (record1->entry_address() != record2->entry_address() || | |
| 95 record1->return_address() != record2->return_address()) { | |
| 96 return false; | |
| 97 } | |
| 98 } | |
| 99 return true; | |
| 100 } | |
| 101 | |
| 102 #if 0 | |
| 103 int pos1 = 0; | |
| 104 int pos2 = 0; | |
| 105 int size1 = size(); | |
| 106 int size2 = other->size(); | |
| 107 while (pos1 < size1 && pos2 < size2) { | |
| 108 JsrRecord* record1 = record_at(pos1); | |
| 109 JsrRecord* record2 = other->record_at(pos2); | |
| 110 int entry1 = record1->entry_address(); | |
| 111 int entry2 = record2->entry_address(); | |
| 112 if (entry1 < entry2) { | |
| 113 pos1++; | |
| 114 } else if (entry1 > entry2) { | |
| 115 pos2++; | |
| 116 } else { | |
| 117 if (record1->return_address() == record2->return_address()) { | |
| 118 pos1++; | |
| 119 pos2++; | |
| 120 } else { | |
| 121 // These two JsrSets are incompatible. | |
| 122 return false; | |
| 123 } | |
| 124 } | |
| 125 } | |
| 126 // The two JsrSets agree. | |
| 127 return true; | |
| 128 #endif | |
| 129 } | |
| 130 | |
| 131 // ------------------------------------------------------------------ | |
| 132 // ciTypeFlow::JsrSet::insert_jsr_record | |
| 133 // | |
| 134 // Insert the given JsrRecord into the JsrSet, maintaining the order | |
| 135 // of the set and replacing any element with the same entry address. | |
| 136 void ciTypeFlow::JsrSet::insert_jsr_record(JsrRecord* record) { | |
| 137 int len = size(); | |
| 138 int entry = record->entry_address(); | |
| 139 int pos = 0; | |
| 140 for ( ; pos < len; pos++) { | |
| 141 JsrRecord* current = record_at(pos); | |
| 142 if (entry == current->entry_address()) { | |
| 143 // Stomp over this entry. | |
| 144 _set->at_put(pos, record); | |
| 145 assert(size() == len, "must be same size"); | |
| 146 return; | |
| 147 } else if (entry < current->entry_address()) { | |
| 148 break; | |
| 149 } | |
| 150 } | |
| 151 | |
| 152 // Insert the record into the list. | |
| 153 JsrRecord* swap = record; | |
| 154 JsrRecord* temp = NULL; | |
| 155 for ( ; pos < len; pos++) { | |
| 156 temp = _set->at(pos); | |
| 157 _set->at_put(pos, swap); | |
| 158 swap = temp; | |
| 159 } | |
| 160 _set->append(swap); | |
| 161 assert(size() == len+1, "must be larger"); | |
| 162 } | |
| 163 | |
| 164 // ------------------------------------------------------------------ | |
| 165 // ciTypeFlow::JsrSet::remove_jsr_record | |
| 166 // | |
| 167 // Remove the JsrRecord with the given return address from the JsrSet. | |
| 168 void ciTypeFlow::JsrSet::remove_jsr_record(int return_address) { | |
| 169 int len = size(); | |
| 170 for (int i = 0; i < len; i++) { | |
| 171 if (record_at(i)->return_address() == return_address) { | |
| 172 // We have found the proper entry. Remove it from the | |
| 173 // JsrSet and exit. | |
| 174 for (int j = i+1; j < len ; j++) { | |
| 175 _set->at_put(j-1, _set->at(j)); | |
| 176 } | |
| 177 _set->trunc_to(len-1); | |
| 178 assert(size() == len-1, "must be smaller"); | |
| 179 return; | |
| 180 } | |
| 181 } | |
| 182 assert(false, "verify: returning from invalid subroutine"); | |
| 183 } | |
| 184 | |
| 185 // ------------------------------------------------------------------ | |
| 186 // ciTypeFlow::JsrSet::apply_control | |
| 187 // | |
| 188 // Apply the effect of a control-flow bytecode on the JsrSet. The | |
| 189 // only bytecodes that modify the JsrSet are jsr and ret. | |
| 190 void ciTypeFlow::JsrSet::apply_control(ciTypeFlow* analyzer, | |
| 191 ciBytecodeStream* str, | |
| 192 ciTypeFlow::StateVector* state) { | |
| 193 Bytecodes::Code code = str->cur_bc(); | |
| 194 if (code == Bytecodes::_jsr) { | |
| 195 JsrRecord* record = | |
| 196 analyzer->make_jsr_record(str->get_dest(), str->next_bci()); | |
| 197 insert_jsr_record(record); | |
| 198 } else if (code == Bytecodes::_jsr_w) { | |
| 199 JsrRecord* record = | |
| 200 analyzer->make_jsr_record(str->get_far_dest(), str->next_bci()); | |
| 201 insert_jsr_record(record); | |
| 202 } else if (code == Bytecodes::_ret) { | |
| 203 Cell local = state->local(str->get_index()); | |
| 204 ciType* return_address = state->type_at(local); | |
| 205 assert(return_address->is_return_address(), "verify: wrong type"); | |
| 206 if (size() == 0) { | |
| 207 // Ret-state underflow: Hit a ret w/o any previous jsrs. Bail out. | |
| 208 // This can happen when a loop is inside a finally clause (4614060). | |
| 209 analyzer->record_failure("OSR in finally clause"); | |
| 210 return; | |
| 211 } | |
| 212 remove_jsr_record(return_address->as_return_address()->bci()); | |
| 213 } | |
| 214 } | |
| 215 | |
| 216 #ifndef PRODUCT | |
| 217 // ------------------------------------------------------------------ | |
| 218 // ciTypeFlow::JsrSet::print_on | |
| 219 void ciTypeFlow::JsrSet::print_on(outputStream* st) const { | |
| 220 st->print("{ "); | |
| 221 int num_elements = size(); | |
| 222 if (num_elements > 0) { | |
| 223 int i = 0; | |
| 224 for( ; i < num_elements - 1; i++) { | |
| 225 _set->at(i)->print_on(st); | |
| 226 st->print(", "); | |
| 227 } | |
| 228 _set->at(i)->print_on(st); | |
| 229 st->print(" "); | |
| 230 } | |
| 231 st->print("}"); | |
| 232 } | |
| 233 #endif | |
| 234 | |
| 235 // ciTypeFlow::StateVector | |
| 236 // | |
| 237 // A StateVector summarizes the type information at some point in | |
| 238 // the program. | |
| 239 | |
| 240 // ------------------------------------------------------------------ | |
| 241 // ciTypeFlow::StateVector::type_meet | |
| 242 // | |
| 243 // Meet two types. | |
| 244 // | |
| 245 // The semi-lattice of types use by this analysis are modeled on those | |
| 246 // of the verifier. The lattice is as follows: | |
| 247 // | |
| 248 // top_type() >= all non-extremal types >= bottom_type | |
| 249 // and | |
| 250 // Every primitive type is comparable only with itself. The meet of | |
| 251 // reference types is determined by their kind: instance class, | |
| 252 // interface, or array class. The meet of two types of the same | |
| 253 // kind is their least common ancestor. The meet of two types of | |
| 254 // different kinds is always java.lang.Object. | |
| 255 ciType* ciTypeFlow::StateVector::type_meet_internal(ciType* t1, ciType* t2, ciTypeFlow* analyzer) { | |
| 256 assert(t1 != t2, "checked in caller"); | |
| 257 if (t1->equals(top_type())) { | |
| 258 return t2; | |
| 259 } else if (t2->equals(top_type())) { | |
| 260 return t1; | |
| 261 } else if (t1->is_primitive_type() || t2->is_primitive_type()) { | |
| 262 // Special case null_type. null_type meet any reference type T | |
| 263 // is T. null_type meet null_type is null_type. | |
| 264 if (t1->equals(null_type())) { | |
| 265 if (!t2->is_primitive_type() || t2->equals(null_type())) { | |
| 266 return t2; | |
| 267 } | |
| 268 } else if (t2->equals(null_type())) { | |
| 269 if (!t1->is_primitive_type()) { | |
| 270 return t1; | |
| 271 } | |
| 272 } | |
| 273 | |
| 274 // At least one of the two types is a non-top primitive type. | |
| 275 // The other type is not equal to it. Fall to bottom. | |
| 276 return bottom_type(); | |
| 277 } else { | |
| 278 // Both types are non-top non-primitive types. That is, | |
| 279 // both types are either instanceKlasses or arrayKlasses. | |
| 280 ciKlass* object_klass = analyzer->env()->Object_klass(); | |
| 281 ciKlass* k1 = t1->as_klass(); | |
| 282 ciKlass* k2 = t2->as_klass(); | |
| 283 if (k1->equals(object_klass) || k2->equals(object_klass)) { | |
| 284 return object_klass; | |
| 285 } else if (!k1->is_loaded() || !k2->is_loaded()) { | |
| 286 // Unloaded classes fall to java.lang.Object at a merge. | |
| 287 return object_klass; | |
| 288 } else if (k1->is_interface() != k2->is_interface()) { | |
| 289 // When an interface meets a non-interface, we get Object; | |
| 290 // This is what the verifier does. | |
| 291 return object_klass; | |
| 292 } else if (k1->is_array_klass() || k2->is_array_klass()) { | |
| 293 // When an array meets a non-array, we get Object. | |
| 294 // When objArray meets typeArray, we also get Object. | |
| 295 // And when typeArray meets different typeArray, we again get Object. | |
| 296 // But when objArray meets objArray, we look carefully at element types. | |
| 297 if (k1->is_obj_array_klass() && k2->is_obj_array_klass()) { | |
| 298 // Meet the element types, then construct the corresponding array type. | |
| 299 ciKlass* elem1 = k1->as_obj_array_klass()->element_klass(); | |
| 300 ciKlass* elem2 = k2->as_obj_array_klass()->element_klass(); | |
| 301 ciKlass* elem = type_meet_internal(elem1, elem2, analyzer)->as_klass(); | |
| 302 // Do an easy shortcut if one type is a super of the other. | |
| 303 if (elem == elem1) { | |
| 304 assert(k1 == ciObjArrayKlass::make(elem), "shortcut is OK"); | |
| 305 return k1; | |
| 306 } else if (elem == elem2) { | |
| 307 assert(k2 == ciObjArrayKlass::make(elem), "shortcut is OK"); | |
| 308 return k2; | |
| 309 } else { | |
| 310 return ciObjArrayKlass::make(elem); | |
| 311 } | |
| 312 } else { | |
| 313 return object_klass; | |
| 314 } | |
| 315 } else { | |
| 316 // Must be two plain old instance klasses. | |
| 317 assert(k1->is_instance_klass(), "previous cases handle non-instances"); | |
| 318 assert(k2->is_instance_klass(), "previous cases handle non-instances"); | |
| 319 return k1->least_common_ancestor(k2); | |
| 320 } | |
| 321 } | |
| 322 } | |
| 323 | |
| 324 | |
| 325 // ------------------------------------------------------------------ | |
| 326 // ciTypeFlow::StateVector::StateVector | |
| 327 // | |
| 328 // Build a new state vector | |
| 329 ciTypeFlow::StateVector::StateVector(ciTypeFlow* analyzer) { | |
| 330 _outer = analyzer; | |
| 331 _stack_size = -1; | |
| 332 _monitor_count = -1; | |
| 333 // Allocate the _types array | |
| 334 int max_cells = analyzer->max_cells(); | |
| 335 _types = (ciType**)analyzer->arena()->Amalloc(sizeof(ciType*) * max_cells); | |
| 336 for (int i=0; i<max_cells; i++) { | |
| 337 _types[i] = top_type(); | |
| 338 } | |
| 339 _trap_bci = -1; | |
| 340 _trap_index = 0; | |
|
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341 _def_locals.clear(); |
| 0 | 342 } |
| 343 | |
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344 |
| 0 | 345 // ------------------------------------------------------------------ |
| 346 // ciTypeFlow::get_start_state | |
| 347 // | |
| 348 // Set this vector to the method entry state. | |
| 349 const ciTypeFlow::StateVector* ciTypeFlow::get_start_state() { | |
| 350 StateVector* state = new StateVector(this); | |
| 351 if (is_osr_flow()) { | |
| 352 ciTypeFlow* non_osr_flow = method()->get_flow_analysis(); | |
| 353 if (non_osr_flow->failing()) { | |
| 354 record_failure(non_osr_flow->failure_reason()); | |
| 355 return NULL; | |
| 356 } | |
| 357 JsrSet* jsrs = new JsrSet(NULL, 16); | |
| 358 Block* non_osr_block = non_osr_flow->existing_block_at(start_bci(), jsrs); | |
| 359 if (non_osr_block == NULL) { | |
| 360 record_failure("cannot reach OSR point"); | |
| 361 return NULL; | |
| 362 } | |
| 363 // load up the non-OSR state at this point | |
| 364 non_osr_block->copy_state_into(state); | |
| 365 int non_osr_start = non_osr_block->start(); | |
| 366 if (non_osr_start != start_bci()) { | |
| 367 // must flow forward from it | |
| 368 if (CITraceTypeFlow) { | |
| 369 tty->print_cr(">> Interpreting pre-OSR block %d:", non_osr_start); | |
| 370 } | |
| 371 Block* block = block_at(non_osr_start, jsrs); | |
| 372 assert(block->limit() == start_bci(), "must flow forward to start"); | |
| 373 flow_block(block, state, jsrs); | |
| 374 } | |
| 375 return state; | |
| 376 // Note: The code below would be an incorrect for an OSR flow, | |
| 377 // even if it were possible for an OSR entry point to be at bci zero. | |
| 378 } | |
| 379 // "Push" the method signature into the first few locals. | |
| 380 state->set_stack_size(-max_locals()); | |
| 381 if (!method()->is_static()) { | |
| 382 state->push(method()->holder()); | |
| 383 assert(state->tos() == state->local(0), ""); | |
| 384 } | |
| 385 for (ciSignatureStream str(method()->signature()); | |
| 386 !str.at_return_type(); | |
| 387 str.next()) { | |
| 388 state->push_translate(str.type()); | |
| 389 } | |
| 390 // Set the rest of the locals to bottom. | |
| 391 Cell cell = state->next_cell(state->tos()); | |
| 392 state->set_stack_size(0); | |
| 393 int limit = state->limit_cell(); | |
| 394 for (; cell < limit; cell = state->next_cell(cell)) { | |
| 395 state->set_type_at(cell, state->bottom_type()); | |
| 396 } | |
| 397 // Lock an object, if necessary. | |
| 398 state->set_monitor_count(method()->is_synchronized() ? 1 : 0); | |
| 399 return state; | |
| 400 } | |
| 401 | |
| 402 // ------------------------------------------------------------------ | |
| 403 // ciTypeFlow::StateVector::copy_into | |
| 404 // | |
| 405 // Copy our value into some other StateVector | |
| 406 void ciTypeFlow::StateVector::copy_into(ciTypeFlow::StateVector* copy) | |
| 407 const { | |
| 408 copy->set_stack_size(stack_size()); | |
| 409 copy->set_monitor_count(monitor_count()); | |
| 410 Cell limit = limit_cell(); | |
| 411 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
| 412 copy->set_type_at(c, type_at(c)); | |
| 413 } | |
| 414 } | |
| 415 | |
| 416 // ------------------------------------------------------------------ | |
| 417 // ciTypeFlow::StateVector::meet | |
| 418 // | |
| 419 // Meets this StateVector with another, destructively modifying this | |
| 420 // one. Returns true if any modification takes place. | |
| 421 bool ciTypeFlow::StateVector::meet(const ciTypeFlow::StateVector* incoming) { | |
| 422 if (monitor_count() == -1) { | |
| 423 set_monitor_count(incoming->monitor_count()); | |
| 424 } | |
| 425 assert(monitor_count() == incoming->monitor_count(), "monitors must match"); | |
| 426 | |
| 427 if (stack_size() == -1) { | |
| 428 set_stack_size(incoming->stack_size()); | |
| 429 Cell limit = limit_cell(); | |
| 430 #ifdef ASSERT | |
| 431 { for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
| 432 assert(type_at(c) == top_type(), ""); | |
| 433 } } | |
| 434 #endif | |
| 435 // Make a simple copy of the incoming state. | |
| 436 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
| 437 set_type_at(c, incoming->type_at(c)); | |
| 438 } | |
| 439 return true; // it is always different the first time | |
| 440 } | |
| 441 #ifdef ASSERT | |
| 442 if (stack_size() != incoming->stack_size()) { | |
| 443 _outer->method()->print_codes(); | |
| 444 tty->print_cr("!!!! Stack size conflict"); | |
| 445 tty->print_cr("Current state:"); | |
| 446 print_on(tty); | |
| 447 tty->print_cr("Incoming state:"); | |
| 448 ((StateVector*)incoming)->print_on(tty); | |
| 449 } | |
| 450 #endif | |
| 451 assert(stack_size() == incoming->stack_size(), "sanity"); | |
| 452 | |
| 453 bool different = false; | |
| 454 Cell limit = limit_cell(); | |
| 455 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
| 456 ciType* t1 = type_at(c); | |
| 457 ciType* t2 = incoming->type_at(c); | |
| 458 if (!t1->equals(t2)) { | |
| 459 ciType* new_type = type_meet(t1, t2); | |
| 460 if (!t1->equals(new_type)) { | |
| 461 set_type_at(c, new_type); | |
| 462 different = true; | |
| 463 } | |
| 464 } | |
| 465 } | |
| 466 return different; | |
| 467 } | |
| 468 | |
| 469 // ------------------------------------------------------------------ | |
| 470 // ciTypeFlow::StateVector::meet_exception | |
| 471 // | |
| 472 // Meets this StateVector with another, destructively modifying this | |
| 473 // one. The incoming state is coming via an exception. Returns true | |
| 474 // if any modification takes place. | |
| 475 bool ciTypeFlow::StateVector::meet_exception(ciInstanceKlass* exc, | |
| 476 const ciTypeFlow::StateVector* incoming) { | |
| 477 if (monitor_count() == -1) { | |
| 478 set_monitor_count(incoming->monitor_count()); | |
| 479 } | |
| 480 assert(monitor_count() == incoming->monitor_count(), "monitors must match"); | |
| 481 | |
| 482 if (stack_size() == -1) { | |
| 483 set_stack_size(1); | |
| 484 } | |
| 485 | |
| 486 assert(stack_size() == 1, "must have one-element stack"); | |
| 487 | |
| 488 bool different = false; | |
| 489 | |
| 490 // Meet locals from incoming array. | |
| 491 Cell limit = local(_outer->max_locals()-1); | |
| 492 for (Cell c = start_cell(); c <= limit; c = next_cell(c)) { | |
| 493 ciType* t1 = type_at(c); | |
| 494 ciType* t2 = incoming->type_at(c); | |
| 495 if (!t1->equals(t2)) { | |
| 496 ciType* new_type = type_meet(t1, t2); | |
| 497 if (!t1->equals(new_type)) { | |
| 498 set_type_at(c, new_type); | |
| 499 different = true; | |
| 500 } | |
| 501 } | |
| 502 } | |
| 503 | |
| 504 // Handle stack separately. When an exception occurs, the | |
| 505 // only stack entry is the exception instance. | |
| 506 ciType* tos_type = type_at_tos(); | |
| 507 if (!tos_type->equals(exc)) { | |
| 508 ciType* new_type = type_meet(tos_type, exc); | |
| 509 if (!tos_type->equals(new_type)) { | |
| 510 set_type_at_tos(new_type); | |
| 511 different = true; | |
| 512 } | |
| 513 } | |
| 514 | |
| 515 return different; | |
| 516 } | |
| 517 | |
| 518 // ------------------------------------------------------------------ | |
| 519 // ciTypeFlow::StateVector::push_translate | |
| 520 void ciTypeFlow::StateVector::push_translate(ciType* type) { | |
| 521 BasicType basic_type = type->basic_type(); | |
| 522 if (basic_type == T_BOOLEAN || basic_type == T_CHAR || | |
| 523 basic_type == T_BYTE || basic_type == T_SHORT) { | |
| 524 push_int(); | |
| 525 } else { | |
| 526 push(type); | |
| 527 if (type->is_two_word()) { | |
| 528 push(half_type(type)); | |
| 529 } | |
| 530 } | |
| 531 } | |
| 532 | |
| 533 // ------------------------------------------------------------------ | |
| 534 // ciTypeFlow::StateVector::do_aaload | |
| 535 void ciTypeFlow::StateVector::do_aaload(ciBytecodeStream* str) { | |
| 536 pop_int(); | |
| 537 ciObjArrayKlass* array_klass = pop_objArray(); | |
| 538 if (array_klass == NULL) { | |
| 539 // Did aaload on a null reference; push a null and ignore the exception. | |
| 540 // This instruction will never continue normally. All we have to do | |
| 541 // is report a value that will meet correctly with any downstream | |
| 542 // reference types on paths that will truly be executed. This null type | |
| 543 // meets with any reference type to yield that same reference type. | |
| 605 | 544 // (The compiler will generate an unconditional exception here.) |
| 0 | 545 push(null_type()); |
| 546 return; | |
| 547 } | |
| 548 if (!array_klass->is_loaded()) { | |
| 549 // Only fails for some -Xcomp runs | |
| 550 trap(str, array_klass, | |
| 551 Deoptimization::make_trap_request | |
| 552 (Deoptimization::Reason_unloaded, | |
| 553 Deoptimization::Action_reinterpret)); | |
| 554 return; | |
| 555 } | |
| 556 ciKlass* element_klass = array_klass->element_klass(); | |
| 557 if (!element_klass->is_loaded() && element_klass->is_instance_klass()) { | |
| 558 Untested("unloaded array element class in ciTypeFlow"); | |
| 559 trap(str, element_klass, | |
| 560 Deoptimization::make_trap_request | |
| 561 (Deoptimization::Reason_unloaded, | |
| 562 Deoptimization::Action_reinterpret)); | |
| 563 } else { | |
| 564 push_object(element_klass); | |
| 565 } | |
| 566 } | |
| 567 | |
| 568 | |
| 569 // ------------------------------------------------------------------ | |
| 570 // ciTypeFlow::StateVector::do_checkcast | |
| 571 void ciTypeFlow::StateVector::do_checkcast(ciBytecodeStream* str) { | |
| 572 bool will_link; | |
| 573 ciKlass* klass = str->get_klass(will_link); | |
| 574 if (!will_link) { | |
| 575 // VM's interpreter will not load 'klass' if object is NULL. | |
| 576 // Type flow after this block may still be needed in two situations: | |
| 577 // 1) C2 uses do_null_assert() and continues compilation for later blocks | |
| 578 // 2) C2 does an OSR compile in a later block (see bug 4778368). | |
| 579 pop_object(); | |
| 580 do_null_assert(klass); | |
| 581 } else { | |
| 582 pop_object(); | |
| 583 push_object(klass); | |
| 584 } | |
| 585 } | |
| 586 | |
| 587 // ------------------------------------------------------------------ | |
| 588 // ciTypeFlow::StateVector::do_getfield | |
| 589 void ciTypeFlow::StateVector::do_getfield(ciBytecodeStream* str) { | |
| 590 // could add assert here for type of object. | |
| 591 pop_object(); | |
| 592 do_getstatic(str); | |
| 593 } | |
| 594 | |
| 595 // ------------------------------------------------------------------ | |
| 596 // ciTypeFlow::StateVector::do_getstatic | |
| 597 void ciTypeFlow::StateVector::do_getstatic(ciBytecodeStream* str) { | |
| 598 bool will_link; | |
| 599 ciField* field = str->get_field(will_link); | |
| 600 if (!will_link) { | |
| 601 trap(str, field->holder(), str->get_field_holder_index()); | |
| 602 } else { | |
| 603 ciType* field_type = field->type(); | |
| 604 if (!field_type->is_loaded()) { | |
| 605 // Normally, we need the field's type to be loaded if we are to | |
| 606 // do anything interesting with its value. | |
| 607 // We used to do this: trap(str, str->get_field_signature_index()); | |
| 608 // | |
| 609 // There is one good reason not to trap here. Execution can | |
| 610 // get past this "getfield" or "getstatic" if the value of | |
| 611 // the field is null. As long as the value is null, the class | |
| 612 // does not need to be loaded! The compiler must assume that | |
| 613 // the value of the unloaded class reference is null; if the code | |
| 614 // ever sees a non-null value, loading has occurred. | |
| 615 // | |
| 616 // This actually happens often enough to be annoying. If the | |
| 617 // compiler throws an uncommon trap at this bytecode, you can | |
| 618 // get an endless loop of recompilations, when all the code | |
| 619 // needs to do is load a series of null values. Also, a trap | |
| 620 // here can make an OSR entry point unreachable, triggering the | |
| 621 // assert on non_osr_block in ciTypeFlow::get_start_state. | |
| 622 // (See bug 4379915.) | |
| 623 do_null_assert(field_type->as_klass()); | |
| 624 } else { | |
| 625 push_translate(field_type); | |
| 626 } | |
| 627 } | |
| 628 } | |
| 629 | |
| 630 // ------------------------------------------------------------------ | |
| 631 // ciTypeFlow::StateVector::do_invoke | |
| 632 void ciTypeFlow::StateVector::do_invoke(ciBytecodeStream* str, | |
| 633 bool has_receiver) { | |
| 634 bool will_link; | |
| 635 ciMethod* method = str->get_method(will_link); | |
| 636 if (!will_link) { | |
| 637 // We weren't able to find the method. | |
|
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638 if (str->cur_bc() == Bytecodes::_invokedynamic) { |
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639 trap(str, NULL, |
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640 Deoptimization::make_trap_request |
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641 (Deoptimization::Reason_uninitialized, |
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642 Deoptimization::Action_reinterpret)); |
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643 } else { |
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644 ciKlass* unloaded_holder = method->holder(); |
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645 trap(str, unloaded_holder, str->get_method_holder_index()); |
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646 } |
| 0 | 647 } else { |
| 648 ciSignature* signature = method->signature(); | |
| 649 ciSignatureStream sigstr(signature); | |
| 650 int arg_size = signature->size(); | |
| 651 int stack_base = stack_size() - arg_size; | |
| 652 int i = 0; | |
| 653 for( ; !sigstr.at_return_type(); sigstr.next()) { | |
| 654 ciType* type = sigstr.type(); | |
| 655 ciType* stack_type = type_at(stack(stack_base + i++)); | |
| 656 // Do I want to check this type? | |
| 657 // assert(stack_type->is_subtype_of(type), "bad type for field value"); | |
| 658 if (type->is_two_word()) { | |
| 659 ciType* stack_type2 = type_at(stack(stack_base + i++)); | |
| 660 assert(stack_type2->equals(half_type(type)), "must be 2nd half"); | |
| 661 } | |
| 662 } | |
| 663 assert(arg_size == i, "must match"); | |
| 664 for (int j = 0; j < arg_size; j++) { | |
| 665 pop(); | |
| 666 } | |
| 667 if (has_receiver) { | |
| 668 // Check this? | |
| 669 pop_object(); | |
| 670 } | |
| 671 assert(!sigstr.is_done(), "must have return type"); | |
| 672 ciType* return_type = sigstr.type(); | |
| 673 if (!return_type->is_void()) { | |
| 674 if (!return_type->is_loaded()) { | |
| 675 // As in do_getstatic(), generally speaking, we need the return type to | |
| 676 // be loaded if we are to do anything interesting with its value. | |
| 677 // We used to do this: trap(str, str->get_method_signature_index()); | |
| 678 // | |
| 679 // We do not trap here since execution can get past this invoke if | |
| 680 // the return value is null. As long as the value is null, the class | |
| 681 // does not need to be loaded! The compiler must assume that | |
| 682 // the value of the unloaded class reference is null; if the code | |
| 683 // ever sees a non-null value, loading has occurred. | |
| 684 // | |
| 685 // See do_getstatic() for similar explanation, as well as bug 4684993. | |
| 686 do_null_assert(return_type->as_klass()); | |
| 687 } else { | |
| 688 push_translate(return_type); | |
| 689 } | |
| 690 } | |
| 691 } | |
| 692 } | |
| 693 | |
| 694 // ------------------------------------------------------------------ | |
| 695 // ciTypeFlow::StateVector::do_jsr | |
| 696 void ciTypeFlow::StateVector::do_jsr(ciBytecodeStream* str) { | |
| 697 push(ciReturnAddress::make(str->next_bci())); | |
| 698 } | |
| 699 | |
| 700 // ------------------------------------------------------------------ | |
| 701 // ciTypeFlow::StateVector::do_ldc | |
| 702 void ciTypeFlow::StateVector::do_ldc(ciBytecodeStream* str) { | |
| 703 ciConstant con = str->get_constant(); | |
| 704 BasicType basic_type = con.basic_type(); | |
| 705 if (basic_type == T_ILLEGAL) { | |
| 706 // OutOfMemoryError in the CI while loading constant | |
| 707 push_null(); | |
| 708 outer()->record_failure("ldc did not link"); | |
| 709 return; | |
| 710 } | |
| 711 if (basic_type == T_OBJECT || basic_type == T_ARRAY) { | |
| 712 ciObject* obj = con.as_object(); | |
| 713 if (obj->is_null_object()) { | |
| 714 push_null(); | |
| 715 } else { | |
|
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716 assert(!obj->is_klass(), "must be java_mirror of klass"); |
| 0 | 717 push_object(obj->klass()); |
| 718 } | |
| 719 } else { | |
| 720 push_translate(ciType::make(basic_type)); | |
| 721 } | |
| 722 } | |
| 723 | |
| 724 // ------------------------------------------------------------------ | |
| 725 // ciTypeFlow::StateVector::do_multianewarray | |
| 726 void ciTypeFlow::StateVector::do_multianewarray(ciBytecodeStream* str) { | |
| 727 int dimensions = str->get_dimensions(); | |
| 728 bool will_link; | |
| 729 ciArrayKlass* array_klass = str->get_klass(will_link)->as_array_klass(); | |
| 730 if (!will_link) { | |
| 731 trap(str, array_klass, str->get_klass_index()); | |
| 732 } else { | |
| 733 for (int i = 0; i < dimensions; i++) { | |
| 734 pop_int(); | |
| 735 } | |
| 736 push_object(array_klass); | |
| 737 } | |
| 738 } | |
| 739 | |
| 740 // ------------------------------------------------------------------ | |
| 741 // ciTypeFlow::StateVector::do_new | |
| 742 void ciTypeFlow::StateVector::do_new(ciBytecodeStream* str) { | |
| 743 bool will_link; | |
| 744 ciKlass* klass = str->get_klass(will_link); | |
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745 if (!will_link || str->is_unresolved_klass()) { |
| 0 | 746 trap(str, klass, str->get_klass_index()); |
| 747 } else { | |
| 748 push_object(klass); | |
| 749 } | |
| 750 } | |
| 751 | |
| 752 // ------------------------------------------------------------------ | |
| 753 // ciTypeFlow::StateVector::do_newarray | |
| 754 void ciTypeFlow::StateVector::do_newarray(ciBytecodeStream* str) { | |
| 755 pop_int(); | |
| 756 ciKlass* klass = ciTypeArrayKlass::make((BasicType)str->get_index()); | |
| 757 push_object(klass); | |
| 758 } | |
| 759 | |
| 760 // ------------------------------------------------------------------ | |
| 761 // ciTypeFlow::StateVector::do_putfield | |
| 762 void ciTypeFlow::StateVector::do_putfield(ciBytecodeStream* str) { | |
| 763 do_putstatic(str); | |
| 764 if (_trap_bci != -1) return; // unloaded field holder, etc. | |
| 765 // could add assert here for type of object. | |
| 766 pop_object(); | |
| 767 } | |
| 768 | |
| 769 // ------------------------------------------------------------------ | |
| 770 // ciTypeFlow::StateVector::do_putstatic | |
| 771 void ciTypeFlow::StateVector::do_putstatic(ciBytecodeStream* str) { | |
| 772 bool will_link; | |
| 773 ciField* field = str->get_field(will_link); | |
| 774 if (!will_link) { | |
| 775 trap(str, field->holder(), str->get_field_holder_index()); | |
| 776 } else { | |
| 777 ciType* field_type = field->type(); | |
| 778 ciType* type = pop_value(); | |
| 779 // Do I want to check this type? | |
| 780 // assert(type->is_subtype_of(field_type), "bad type for field value"); | |
| 781 if (field_type->is_two_word()) { | |
| 782 ciType* type2 = pop_value(); | |
| 783 assert(type2->is_two_word(), "must be 2nd half"); | |
| 784 assert(type == half_type(type2), "must be 2nd half"); | |
| 785 } | |
| 786 } | |
| 787 } | |
| 788 | |
| 789 // ------------------------------------------------------------------ | |
| 790 // ciTypeFlow::StateVector::do_ret | |
| 791 void ciTypeFlow::StateVector::do_ret(ciBytecodeStream* str) { | |
| 792 Cell index = local(str->get_index()); | |
| 793 | |
| 794 ciType* address = type_at(index); | |
| 795 assert(address->is_return_address(), "bad return address"); | |
| 796 set_type_at(index, bottom_type()); | |
| 797 } | |
| 798 | |
| 799 // ------------------------------------------------------------------ | |
| 800 // ciTypeFlow::StateVector::trap | |
| 801 // | |
| 802 // Stop interpretation of this path with a trap. | |
| 803 void ciTypeFlow::StateVector::trap(ciBytecodeStream* str, ciKlass* klass, int index) { | |
| 804 _trap_bci = str->cur_bci(); | |
| 805 _trap_index = index; | |
| 806 | |
| 807 // Log information about this trap: | |
| 808 CompileLog* log = outer()->env()->log(); | |
| 809 if (log != NULL) { | |
| 810 int mid = log->identify(outer()->method()); | |
| 811 int kid = (klass == NULL)? -1: log->identify(klass); | |
| 812 log->begin_elem("uncommon_trap method='%d' bci='%d'", mid, str->cur_bci()); | |
| 813 char buf[100]; | |
| 814 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), | |
| 815 index)); | |
| 816 if (kid >= 0) | |
| 817 log->print(" klass='%d'", kid); | |
| 818 log->end_elem(); | |
| 819 } | |
| 820 } | |
| 821 | |
| 822 // ------------------------------------------------------------------ | |
| 823 // ciTypeFlow::StateVector::do_null_assert | |
| 824 // Corresponds to graphKit::do_null_assert. | |
| 825 void ciTypeFlow::StateVector::do_null_assert(ciKlass* unloaded_klass) { | |
| 826 if (unloaded_klass->is_loaded()) { | |
| 827 // We failed to link, but we can still compute with this class, | |
| 828 // since it is loaded somewhere. The compiler will uncommon_trap | |
| 829 // if the object is not null, but the typeflow pass can not assume | |
| 830 // that the object will be null, otherwise it may incorrectly tell | |
| 831 // the parser that an object is known to be null. 4761344, 4807707 | |
| 832 push_object(unloaded_klass); | |
| 833 } else { | |
| 834 // The class is not loaded anywhere. It is safe to model the | |
| 835 // null in the typestates, because we can compile in a null check | |
| 836 // which will deoptimize us if someone manages to load the | |
| 837 // class later. | |
| 838 push_null(); | |
| 839 } | |
| 840 } | |
| 841 | |
| 842 | |
| 843 // ------------------------------------------------------------------ | |
| 844 // ciTypeFlow::StateVector::apply_one_bytecode | |
| 845 // | |
| 846 // Apply the effect of one bytecode to this StateVector | |
| 847 bool ciTypeFlow::StateVector::apply_one_bytecode(ciBytecodeStream* str) { | |
| 848 _trap_bci = -1; | |
| 849 _trap_index = 0; | |
| 850 | |
| 851 if (CITraceTypeFlow) { | |
| 852 tty->print_cr(">> Interpreting bytecode %d:%s", str->cur_bci(), | |
| 853 Bytecodes::name(str->cur_bc())); | |
| 854 } | |
| 855 | |
| 856 switch(str->cur_bc()) { | |
| 857 case Bytecodes::_aaload: do_aaload(str); break; | |
| 858 | |
| 859 case Bytecodes::_aastore: | |
| 860 { | |
| 861 pop_object(); | |
| 862 pop_int(); | |
| 863 pop_objArray(); | |
| 864 break; | |
| 865 } | |
| 866 case Bytecodes::_aconst_null: | |
| 867 { | |
| 868 push_null(); | |
| 869 break; | |
| 870 } | |
| 871 case Bytecodes::_aload: load_local_object(str->get_index()); break; | |
| 872 case Bytecodes::_aload_0: load_local_object(0); break; | |
| 873 case Bytecodes::_aload_1: load_local_object(1); break; | |
| 874 case Bytecodes::_aload_2: load_local_object(2); break; | |
| 875 case Bytecodes::_aload_3: load_local_object(3); break; | |
| 876 | |
| 877 case Bytecodes::_anewarray: | |
| 878 { | |
| 879 pop_int(); | |
| 880 bool will_link; | |
| 881 ciKlass* element_klass = str->get_klass(will_link); | |
| 882 if (!will_link) { | |
| 883 trap(str, element_klass, str->get_klass_index()); | |
| 884 } else { | |
| 885 push_object(ciObjArrayKlass::make(element_klass)); | |
| 886 } | |
| 887 break; | |
| 888 } | |
| 889 case Bytecodes::_areturn: | |
| 890 case Bytecodes::_ifnonnull: | |
| 891 case Bytecodes::_ifnull: | |
| 892 { | |
| 893 pop_object(); | |
| 894 break; | |
| 895 } | |
| 896 case Bytecodes::_monitorenter: | |
| 897 { | |
| 898 pop_object(); | |
| 899 set_monitor_count(monitor_count() + 1); | |
| 900 break; | |
| 901 } | |
| 902 case Bytecodes::_monitorexit: | |
| 903 { | |
| 904 pop_object(); | |
| 905 assert(monitor_count() > 0, "must be a monitor to exit from"); | |
| 906 set_monitor_count(monitor_count() - 1); | |
| 907 break; | |
| 908 } | |
| 909 case Bytecodes::_arraylength: | |
| 910 { | |
| 911 pop_array(); | |
| 912 push_int(); | |
| 913 break; | |
| 914 } | |
| 915 case Bytecodes::_astore: store_local_object(str->get_index()); break; | |
| 916 case Bytecodes::_astore_0: store_local_object(0); break; | |
| 917 case Bytecodes::_astore_1: store_local_object(1); break; | |
| 918 case Bytecodes::_astore_2: store_local_object(2); break; | |
| 919 case Bytecodes::_astore_3: store_local_object(3); break; | |
| 920 | |
| 921 case Bytecodes::_athrow: | |
| 922 { | |
| 923 NEEDS_CLEANUP; | |
| 924 pop_object(); | |
| 925 break; | |
| 926 } | |
| 927 case Bytecodes::_baload: | |
| 928 case Bytecodes::_caload: | |
| 929 case Bytecodes::_iaload: | |
| 930 case Bytecodes::_saload: | |
| 931 { | |
| 932 pop_int(); | |
| 933 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
| 934 // Put assert here for right type? | |
| 935 push_int(); | |
| 936 break; | |
| 937 } | |
| 938 case Bytecodes::_bastore: | |
| 939 case Bytecodes::_castore: | |
| 940 case Bytecodes::_iastore: | |
| 941 case Bytecodes::_sastore: | |
| 942 { | |
| 943 pop_int(); | |
| 944 pop_int(); | |
| 945 pop_typeArray(); | |
| 946 // assert here? | |
| 947 break; | |
| 948 } | |
| 949 case Bytecodes::_bipush: | |
| 950 case Bytecodes::_iconst_m1: | |
| 951 case Bytecodes::_iconst_0: | |
| 952 case Bytecodes::_iconst_1: | |
| 953 case Bytecodes::_iconst_2: | |
| 954 case Bytecodes::_iconst_3: | |
| 955 case Bytecodes::_iconst_4: | |
| 956 case Bytecodes::_iconst_5: | |
| 957 case Bytecodes::_sipush: | |
| 958 { | |
| 959 push_int(); | |
| 960 break; | |
| 961 } | |
| 962 case Bytecodes::_checkcast: do_checkcast(str); break; | |
| 963 | |
| 964 case Bytecodes::_d2f: | |
| 965 { | |
| 966 pop_double(); | |
| 967 push_float(); | |
| 968 break; | |
| 969 } | |
| 970 case Bytecodes::_d2i: | |
| 971 { | |
| 972 pop_double(); | |
| 973 push_int(); | |
| 974 break; | |
| 975 } | |
| 976 case Bytecodes::_d2l: | |
| 977 { | |
| 978 pop_double(); | |
| 979 push_long(); | |
| 980 break; | |
| 981 } | |
| 982 case Bytecodes::_dadd: | |
| 983 case Bytecodes::_ddiv: | |
| 984 case Bytecodes::_dmul: | |
| 985 case Bytecodes::_drem: | |
| 986 case Bytecodes::_dsub: | |
| 987 { | |
| 988 pop_double(); | |
| 989 pop_double(); | |
| 990 push_double(); | |
| 991 break; | |
| 992 } | |
| 993 case Bytecodes::_daload: | |
| 994 { | |
| 995 pop_int(); | |
| 996 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
| 997 // Put assert here for right type? | |
| 998 push_double(); | |
| 999 break; | |
| 1000 } | |
| 1001 case Bytecodes::_dastore: | |
| 1002 { | |
| 1003 pop_double(); | |
| 1004 pop_int(); | |
| 1005 pop_typeArray(); | |
| 1006 // assert here? | |
| 1007 break; | |
| 1008 } | |
| 1009 case Bytecodes::_dcmpg: | |
| 1010 case Bytecodes::_dcmpl: | |
| 1011 { | |
| 1012 pop_double(); | |
| 1013 pop_double(); | |
| 1014 push_int(); | |
| 1015 break; | |
| 1016 } | |
| 1017 case Bytecodes::_dconst_0: | |
| 1018 case Bytecodes::_dconst_1: | |
| 1019 { | |
| 1020 push_double(); | |
| 1021 break; | |
| 1022 } | |
| 1023 case Bytecodes::_dload: load_local_double(str->get_index()); break; | |
| 1024 case Bytecodes::_dload_0: load_local_double(0); break; | |
| 1025 case Bytecodes::_dload_1: load_local_double(1); break; | |
| 1026 case Bytecodes::_dload_2: load_local_double(2); break; | |
| 1027 case Bytecodes::_dload_3: load_local_double(3); break; | |
| 1028 | |
| 1029 case Bytecodes::_dneg: | |
| 1030 { | |
| 1031 pop_double(); | |
| 1032 push_double(); | |
| 1033 break; | |
| 1034 } | |
| 1035 case Bytecodes::_dreturn: | |
| 1036 { | |
| 1037 pop_double(); | |
| 1038 break; | |
| 1039 } | |
| 1040 case Bytecodes::_dstore: store_local_double(str->get_index()); break; | |
| 1041 case Bytecodes::_dstore_0: store_local_double(0); break; | |
| 1042 case Bytecodes::_dstore_1: store_local_double(1); break; | |
| 1043 case Bytecodes::_dstore_2: store_local_double(2); break; | |
| 1044 case Bytecodes::_dstore_3: store_local_double(3); break; | |
| 1045 | |
| 1046 case Bytecodes::_dup: | |
| 1047 { | |
| 1048 push(type_at_tos()); | |
| 1049 break; | |
| 1050 } | |
| 1051 case Bytecodes::_dup_x1: | |
| 1052 { | |
| 1053 ciType* value1 = pop_value(); | |
| 1054 ciType* value2 = pop_value(); | |
| 1055 push(value1); | |
| 1056 push(value2); | |
| 1057 push(value1); | |
| 1058 break; | |
| 1059 } | |
| 1060 case Bytecodes::_dup_x2: | |
| 1061 { | |
| 1062 ciType* value1 = pop_value(); | |
| 1063 ciType* value2 = pop_value(); | |
| 1064 ciType* value3 = pop_value(); | |
| 1065 push(value1); | |
| 1066 push(value3); | |
| 1067 push(value2); | |
| 1068 push(value1); | |
| 1069 break; | |
| 1070 } | |
| 1071 case Bytecodes::_dup2: | |
| 1072 { | |
| 1073 ciType* value1 = pop_value(); | |
| 1074 ciType* value2 = pop_value(); | |
| 1075 push(value2); | |
| 1076 push(value1); | |
| 1077 push(value2); | |
| 1078 push(value1); | |
| 1079 break; | |
| 1080 } | |
| 1081 case Bytecodes::_dup2_x1: | |
| 1082 { | |
| 1083 ciType* value1 = pop_value(); | |
| 1084 ciType* value2 = pop_value(); | |
| 1085 ciType* value3 = pop_value(); | |
| 1086 push(value2); | |
| 1087 push(value1); | |
| 1088 push(value3); | |
| 1089 push(value2); | |
| 1090 push(value1); | |
| 1091 break; | |
| 1092 } | |
| 1093 case Bytecodes::_dup2_x2: | |
| 1094 { | |
| 1095 ciType* value1 = pop_value(); | |
| 1096 ciType* value2 = pop_value(); | |
| 1097 ciType* value3 = pop_value(); | |
| 1098 ciType* value4 = pop_value(); | |
| 1099 push(value2); | |
| 1100 push(value1); | |
| 1101 push(value4); | |
| 1102 push(value3); | |
| 1103 push(value2); | |
| 1104 push(value1); | |
| 1105 break; | |
| 1106 } | |
| 1107 case Bytecodes::_f2d: | |
| 1108 { | |
| 1109 pop_float(); | |
| 1110 push_double(); | |
| 1111 break; | |
| 1112 } | |
| 1113 case Bytecodes::_f2i: | |
| 1114 { | |
| 1115 pop_float(); | |
| 1116 push_int(); | |
| 1117 break; | |
| 1118 } | |
| 1119 case Bytecodes::_f2l: | |
| 1120 { | |
| 1121 pop_float(); | |
| 1122 push_long(); | |
| 1123 break; | |
| 1124 } | |
| 1125 case Bytecodes::_fadd: | |
| 1126 case Bytecodes::_fdiv: | |
| 1127 case Bytecodes::_fmul: | |
| 1128 case Bytecodes::_frem: | |
| 1129 case Bytecodes::_fsub: | |
| 1130 { | |
| 1131 pop_float(); | |
| 1132 pop_float(); | |
| 1133 push_float(); | |
| 1134 break; | |
| 1135 } | |
| 1136 case Bytecodes::_faload: | |
| 1137 { | |
| 1138 pop_int(); | |
| 1139 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
| 1140 // Put assert here. | |
| 1141 push_float(); | |
| 1142 break; | |
| 1143 } | |
| 1144 case Bytecodes::_fastore: | |
| 1145 { | |
| 1146 pop_float(); | |
| 1147 pop_int(); | |
| 1148 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
| 1149 // Put assert here. | |
| 1150 break; | |
| 1151 } | |
| 1152 case Bytecodes::_fcmpg: | |
| 1153 case Bytecodes::_fcmpl: | |
| 1154 { | |
| 1155 pop_float(); | |
| 1156 pop_float(); | |
| 1157 push_int(); | |
| 1158 break; | |
| 1159 } | |
| 1160 case Bytecodes::_fconst_0: | |
| 1161 case Bytecodes::_fconst_1: | |
| 1162 case Bytecodes::_fconst_2: | |
| 1163 { | |
| 1164 push_float(); | |
| 1165 break; | |
| 1166 } | |
| 1167 case Bytecodes::_fload: load_local_float(str->get_index()); break; | |
| 1168 case Bytecodes::_fload_0: load_local_float(0); break; | |
| 1169 case Bytecodes::_fload_1: load_local_float(1); break; | |
| 1170 case Bytecodes::_fload_2: load_local_float(2); break; | |
| 1171 case Bytecodes::_fload_3: load_local_float(3); break; | |
| 1172 | |
| 1173 case Bytecodes::_fneg: | |
| 1174 { | |
| 1175 pop_float(); | |
| 1176 push_float(); | |
| 1177 break; | |
| 1178 } | |
| 1179 case Bytecodes::_freturn: | |
| 1180 { | |
| 1181 pop_float(); | |
| 1182 break; | |
| 1183 } | |
| 1184 case Bytecodes::_fstore: store_local_float(str->get_index()); break; | |
| 1185 case Bytecodes::_fstore_0: store_local_float(0); break; | |
| 1186 case Bytecodes::_fstore_1: store_local_float(1); break; | |
| 1187 case Bytecodes::_fstore_2: store_local_float(2); break; | |
| 1188 case Bytecodes::_fstore_3: store_local_float(3); break; | |
| 1189 | |
| 1190 case Bytecodes::_getfield: do_getfield(str); break; | |
| 1191 case Bytecodes::_getstatic: do_getstatic(str); break; | |
| 1192 | |
| 1193 case Bytecodes::_goto: | |
| 1194 case Bytecodes::_goto_w: | |
| 1195 case Bytecodes::_nop: | |
| 1196 case Bytecodes::_return: | |
| 1197 { | |
| 1198 // do nothing. | |
| 1199 break; | |
| 1200 } | |
| 1201 case Bytecodes::_i2b: | |
| 1202 case Bytecodes::_i2c: | |
| 1203 case Bytecodes::_i2s: | |
| 1204 case Bytecodes::_ineg: | |
| 1205 { | |
| 1206 pop_int(); | |
| 1207 push_int(); | |
| 1208 break; | |
| 1209 } | |
| 1210 case Bytecodes::_i2d: | |
| 1211 { | |
| 1212 pop_int(); | |
| 1213 push_double(); | |
| 1214 break; | |
| 1215 } | |
| 1216 case Bytecodes::_i2f: | |
| 1217 { | |
| 1218 pop_int(); | |
| 1219 push_float(); | |
| 1220 break; | |
| 1221 } | |
| 1222 case Bytecodes::_i2l: | |
| 1223 { | |
| 1224 pop_int(); | |
| 1225 push_long(); | |
| 1226 break; | |
| 1227 } | |
| 1228 case Bytecodes::_iadd: | |
| 1229 case Bytecodes::_iand: | |
| 1230 case Bytecodes::_idiv: | |
| 1231 case Bytecodes::_imul: | |
| 1232 case Bytecodes::_ior: | |
| 1233 case Bytecodes::_irem: | |
| 1234 case Bytecodes::_ishl: | |
| 1235 case Bytecodes::_ishr: | |
| 1236 case Bytecodes::_isub: | |
| 1237 case Bytecodes::_iushr: | |
| 1238 case Bytecodes::_ixor: | |
| 1239 { | |
| 1240 pop_int(); | |
| 1241 pop_int(); | |
| 1242 push_int(); | |
| 1243 break; | |
| 1244 } | |
| 1245 case Bytecodes::_if_acmpeq: | |
| 1246 case Bytecodes::_if_acmpne: | |
| 1247 { | |
| 1248 pop_object(); | |
| 1249 pop_object(); | |
| 1250 break; | |
| 1251 } | |
| 1252 case Bytecodes::_if_icmpeq: | |
| 1253 case Bytecodes::_if_icmpge: | |
| 1254 case Bytecodes::_if_icmpgt: | |
| 1255 case Bytecodes::_if_icmple: | |
| 1256 case Bytecodes::_if_icmplt: | |
| 1257 case Bytecodes::_if_icmpne: | |
| 1258 { | |
| 1259 pop_int(); | |
| 1260 pop_int(); | |
| 1261 break; | |
| 1262 } | |
| 1263 case Bytecodes::_ifeq: | |
| 1264 case Bytecodes::_ifle: | |
| 1265 case Bytecodes::_iflt: | |
| 1266 case Bytecodes::_ifge: | |
| 1267 case Bytecodes::_ifgt: | |
| 1268 case Bytecodes::_ifne: | |
| 1269 case Bytecodes::_ireturn: | |
| 1270 case Bytecodes::_lookupswitch: | |
| 1271 case Bytecodes::_tableswitch: | |
| 1272 { | |
| 1273 pop_int(); | |
| 1274 break; | |
| 1275 } | |
| 1276 case Bytecodes::_iinc: | |
| 1277 { | |
|
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1278 int lnum = str->get_index(); |
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1279 check_int(local(lnum)); |
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1280 store_to_local(lnum); |
| 0 | 1281 break; |
| 1282 } | |
| 1283 case Bytecodes::_iload: load_local_int(str->get_index()); break; | |
| 1284 case Bytecodes::_iload_0: load_local_int(0); break; | |
| 1285 case Bytecodes::_iload_1: load_local_int(1); break; | |
| 1286 case Bytecodes::_iload_2: load_local_int(2); break; | |
| 1287 case Bytecodes::_iload_3: load_local_int(3); break; | |
| 1288 | |
| 1289 case Bytecodes::_instanceof: | |
| 1290 { | |
| 1291 // Check for uncommon trap: | |
| 1292 do_checkcast(str); | |
| 1293 pop_object(); | |
| 1294 push_int(); | |
| 1295 break; | |
| 1296 } | |
| 1297 case Bytecodes::_invokeinterface: do_invoke(str, true); break; | |
| 1298 case Bytecodes::_invokespecial: do_invoke(str, true); break; | |
| 1299 case Bytecodes::_invokestatic: do_invoke(str, false); break; | |
| 1300 case Bytecodes::_invokevirtual: do_invoke(str, true); break; | |
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1301 case Bytecodes::_invokedynamic: do_invoke(str, false); break; |
| 0 | 1302 |
| 1303 case Bytecodes::_istore: store_local_int(str->get_index()); break; | |
| 1304 case Bytecodes::_istore_0: store_local_int(0); break; | |
| 1305 case Bytecodes::_istore_1: store_local_int(1); break; | |
| 1306 case Bytecodes::_istore_2: store_local_int(2); break; | |
| 1307 case Bytecodes::_istore_3: store_local_int(3); break; | |
| 1308 | |
| 1309 case Bytecodes::_jsr: | |
| 1310 case Bytecodes::_jsr_w: do_jsr(str); break; | |
| 1311 | |
| 1312 case Bytecodes::_l2d: | |
| 1313 { | |
| 1314 pop_long(); | |
| 1315 push_double(); | |
| 1316 break; | |
| 1317 } | |
| 1318 case Bytecodes::_l2f: | |
| 1319 { | |
| 1320 pop_long(); | |
| 1321 push_float(); | |
| 1322 break; | |
| 1323 } | |
| 1324 case Bytecodes::_l2i: | |
| 1325 { | |
| 1326 pop_long(); | |
| 1327 push_int(); | |
| 1328 break; | |
| 1329 } | |
| 1330 case Bytecodes::_ladd: | |
| 1331 case Bytecodes::_land: | |
| 1332 case Bytecodes::_ldiv: | |
| 1333 case Bytecodes::_lmul: | |
| 1334 case Bytecodes::_lor: | |
| 1335 case Bytecodes::_lrem: | |
| 1336 case Bytecodes::_lsub: | |
| 1337 case Bytecodes::_lxor: | |
| 1338 { | |
| 1339 pop_long(); | |
| 1340 pop_long(); | |
| 1341 push_long(); | |
| 1342 break; | |
| 1343 } | |
| 1344 case Bytecodes::_laload: | |
| 1345 { | |
| 1346 pop_int(); | |
| 1347 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
| 1348 // Put assert here for right type? | |
| 1349 push_long(); | |
| 1350 break; | |
| 1351 } | |
| 1352 case Bytecodes::_lastore: | |
| 1353 { | |
| 1354 pop_long(); | |
| 1355 pop_int(); | |
| 1356 pop_typeArray(); | |
| 1357 // assert here? | |
| 1358 break; | |
| 1359 } | |
| 1360 case Bytecodes::_lcmp: | |
| 1361 { | |
| 1362 pop_long(); | |
| 1363 pop_long(); | |
| 1364 push_int(); | |
| 1365 break; | |
| 1366 } | |
| 1367 case Bytecodes::_lconst_0: | |
| 1368 case Bytecodes::_lconst_1: | |
| 1369 { | |
| 1370 push_long(); | |
| 1371 break; | |
| 1372 } | |
| 1373 case Bytecodes::_ldc: | |
| 1374 case Bytecodes::_ldc_w: | |
| 1375 case Bytecodes::_ldc2_w: | |
| 1376 { | |
| 1377 do_ldc(str); | |
| 1378 break; | |
| 1379 } | |
| 1380 | |
| 1381 case Bytecodes::_lload: load_local_long(str->get_index()); break; | |
| 1382 case Bytecodes::_lload_0: load_local_long(0); break; | |
| 1383 case Bytecodes::_lload_1: load_local_long(1); break; | |
| 1384 case Bytecodes::_lload_2: load_local_long(2); break; | |
| 1385 case Bytecodes::_lload_3: load_local_long(3); break; | |
| 1386 | |
| 1387 case Bytecodes::_lneg: | |
| 1388 { | |
| 1389 pop_long(); | |
| 1390 push_long(); | |
| 1391 break; | |
| 1392 } | |
| 1393 case Bytecodes::_lreturn: | |
| 1394 { | |
| 1395 pop_long(); | |
| 1396 break; | |
| 1397 } | |
| 1398 case Bytecodes::_lshl: | |
| 1399 case Bytecodes::_lshr: | |
| 1400 case Bytecodes::_lushr: | |
| 1401 { | |
| 1402 pop_int(); | |
| 1403 pop_long(); | |
| 1404 push_long(); | |
| 1405 break; | |
| 1406 } | |
| 1407 case Bytecodes::_lstore: store_local_long(str->get_index()); break; | |
| 1408 case Bytecodes::_lstore_0: store_local_long(0); break; | |
| 1409 case Bytecodes::_lstore_1: store_local_long(1); break; | |
| 1410 case Bytecodes::_lstore_2: store_local_long(2); break; | |
| 1411 case Bytecodes::_lstore_3: store_local_long(3); break; | |
| 1412 | |
| 1413 case Bytecodes::_multianewarray: do_multianewarray(str); break; | |
| 1414 | |
| 1415 case Bytecodes::_new: do_new(str); break; | |
| 1416 | |
| 1417 case Bytecodes::_newarray: do_newarray(str); break; | |
| 1418 | |
| 1419 case Bytecodes::_pop: | |
| 1420 { | |
| 1421 pop(); | |
| 1422 break; | |
| 1423 } | |
| 1424 case Bytecodes::_pop2: | |
| 1425 { | |
| 1426 pop(); | |
| 1427 pop(); | |
| 1428 break; | |
| 1429 } | |
| 1430 | |
| 1431 case Bytecodes::_putfield: do_putfield(str); break; | |
| 1432 case Bytecodes::_putstatic: do_putstatic(str); break; | |
| 1433 | |
| 1434 case Bytecodes::_ret: do_ret(str); break; | |
| 1435 | |
| 1436 case Bytecodes::_swap: | |
| 1437 { | |
| 1438 ciType* value1 = pop_value(); | |
| 1439 ciType* value2 = pop_value(); | |
| 1440 push(value1); | |
| 1441 push(value2); | |
| 1442 break; | |
| 1443 } | |
| 1444 case Bytecodes::_wide: | |
| 1445 default: | |
| 1446 { | |
| 1447 // The iterator should skip this. | |
| 1448 ShouldNotReachHere(); | |
| 1449 break; | |
| 1450 } | |
| 1451 } | |
| 1452 | |
| 1453 if (CITraceTypeFlow) { | |
| 1454 print_on(tty); | |
| 1455 } | |
| 1456 | |
| 1457 return (_trap_bci != -1); | |
| 1458 } | |
| 1459 | |
| 1460 #ifndef PRODUCT | |
| 1461 // ------------------------------------------------------------------ | |
| 1462 // ciTypeFlow::StateVector::print_cell_on | |
| 1463 void ciTypeFlow::StateVector::print_cell_on(outputStream* st, Cell c) const { | |
| 1464 ciType* type = type_at(c); | |
| 1465 if (type == top_type()) { | |
| 1466 st->print("top"); | |
| 1467 } else if (type == bottom_type()) { | |
| 1468 st->print("bottom"); | |
| 1469 } else if (type == null_type()) { | |
| 1470 st->print("null"); | |
| 1471 } else if (type == long2_type()) { | |
| 1472 st->print("long2"); | |
| 1473 } else if (type == double2_type()) { | |
| 1474 st->print("double2"); | |
| 1475 } else if (is_int(type)) { | |
| 1476 st->print("int"); | |
| 1477 } else if (is_long(type)) { | |
| 1478 st->print("long"); | |
| 1479 } else if (is_float(type)) { | |
| 1480 st->print("float"); | |
| 1481 } else if (is_double(type)) { | |
| 1482 st->print("double"); | |
| 1483 } else if (type->is_return_address()) { | |
| 1484 st->print("address(%d)", type->as_return_address()->bci()); | |
| 1485 } else { | |
| 1486 if (type->is_klass()) { | |
| 1487 type->as_klass()->name()->print_symbol_on(st); | |
| 1488 } else { | |
| 1489 st->print("UNEXPECTED TYPE"); | |
| 1490 type->print(); | |
| 1491 } | |
| 1492 } | |
| 1493 } | |
| 1494 | |
| 1495 // ------------------------------------------------------------------ | |
| 1496 // ciTypeFlow::StateVector::print_on | |
| 1497 void ciTypeFlow::StateVector::print_on(outputStream* st) const { | |
| 1498 int num_locals = _outer->max_locals(); | |
| 1499 int num_stack = stack_size(); | |
| 1500 int num_monitors = monitor_count(); | |
| 1501 st->print_cr(" State : locals %d, stack %d, monitors %d", num_locals, num_stack, num_monitors); | |
| 1502 if (num_stack >= 0) { | |
| 1503 int i; | |
| 1504 for (i = 0; i < num_locals; i++) { | |
| 1505 st->print(" local %2d : ", i); | |
| 1506 print_cell_on(st, local(i)); | |
| 1507 st->cr(); | |
| 1508 } | |
| 1509 for (i = 0; i < num_stack; i++) { | |
| 1510 st->print(" stack %2d : ", i); | |
| 1511 print_cell_on(st, stack(i)); | |
| 1512 st->cr(); | |
| 1513 } | |
| 1514 } | |
| 1515 } | |
| 1516 #endif | |
| 1517 | |
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1518 |
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1519 // ------------------------------------------------------------------ |
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1520 // ciTypeFlow::SuccIter::next |
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1521 // |
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1522 void ciTypeFlow::SuccIter::next() { |
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1523 int succ_ct = _pred->successors()->length(); |
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1524 int next = _index + 1; |
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1525 if (next < succ_ct) { |
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1526 _index = next; |
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1527 _succ = _pred->successors()->at(next); |
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1528 return; |
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1529 } |
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1530 for (int i = next - succ_ct; i < _pred->exceptions()->length(); i++) { |
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1531 // Do not compile any code for unloaded exception types. |
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1532 // Following compiler passes are responsible for doing this also. |
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1533 ciInstanceKlass* exception_klass = _pred->exc_klasses()->at(i); |
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1534 if (exception_klass->is_loaded()) { |
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1535 _index = next; |
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1536 _succ = _pred->exceptions()->at(i); |
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1537 return; |
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1538 } |
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1539 next++; |
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1540 } |
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1541 _index = -1; |
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1542 _succ = NULL; |
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1543 } |
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1544 |
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1545 // ------------------------------------------------------------------ |
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1546 // ciTypeFlow::SuccIter::set_succ |
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1547 // |
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1548 void ciTypeFlow::SuccIter::set_succ(Block* succ) { |
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1549 int succ_ct = _pred->successors()->length(); |
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1550 if (_index < succ_ct) { |
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1551 _pred->successors()->at_put(_index, succ); |
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1552 } else { |
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1553 int idx = _index - succ_ct; |
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1554 _pred->exceptions()->at_put(idx, succ); |
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1555 } |
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1556 } |
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1557 |
| 0 | 1558 // ciTypeFlow::Block |
| 1559 // | |
| 1560 // A basic block. | |
| 1561 | |
| 1562 // ------------------------------------------------------------------ | |
| 1563 // ciTypeFlow::Block::Block | |
| 1564 ciTypeFlow::Block::Block(ciTypeFlow* outer, | |
| 1565 ciBlock *ciblk, | |
| 1566 ciTypeFlow::JsrSet* jsrs) { | |
| 1567 _ciblock = ciblk; | |
| 1568 _exceptions = NULL; | |
| 1569 _exc_klasses = NULL; | |
| 1570 _successors = NULL; | |
| 1571 _state = new (outer->arena()) StateVector(outer); | |
| 1572 JsrSet* new_jsrs = | |
| 1573 new (outer->arena()) JsrSet(outer->arena(), jsrs->size()); | |
| 1574 jsrs->copy_into(new_jsrs); | |
| 1575 _jsrs = new_jsrs; | |
| 1576 _next = NULL; | |
| 1577 _on_work_list = false; | |
|
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1578 _backedge_copy = false; |
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1579 _exception_entry = false; |
| 0 | 1580 _trap_bci = -1; |
| 1581 _trap_index = 0; | |
|
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1582 df_init(); |
| 0 | 1583 |
| 1584 if (CITraceTypeFlow) { | |
| 1585 tty->print_cr(">> Created new block"); | |
| 1586 print_on(tty); | |
| 1587 } | |
| 1588 | |
| 1589 assert(this->outer() == outer, "outer link set up"); | |
| 1590 assert(!outer->have_block_count(), "must not have mapped blocks yet"); | |
| 1591 } | |
| 1592 | |
| 1593 // ------------------------------------------------------------------ | |
|
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1594 // ciTypeFlow::Block::df_init |
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1595 void ciTypeFlow::Block::df_init() { |
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1596 _pre_order = -1; assert(!has_pre_order(), ""); |
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1597 _post_order = -1; assert(!has_post_order(), ""); |
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1598 _loop = NULL; |
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1599 _irreducible_entry = false; |
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1600 _rpo_next = NULL; |
| 0 | 1601 } |
| 1602 | |
| 1603 // ------------------------------------------------------------------ | |
| 1604 // ciTypeFlow::Block::successors | |
| 1605 // | |
| 1606 // Get the successors for this Block. | |
| 1607 GrowableArray<ciTypeFlow::Block*>* | |
| 1608 ciTypeFlow::Block::successors(ciBytecodeStream* str, | |
| 1609 ciTypeFlow::StateVector* state, | |
| 1610 ciTypeFlow::JsrSet* jsrs) { | |
| 1611 if (_successors == NULL) { | |
| 1612 if (CITraceTypeFlow) { | |
| 1613 tty->print(">> Computing successors for block "); | |
| 1614 print_value_on(tty); | |
| 1615 tty->cr(); | |
| 1616 } | |
| 1617 | |
| 1618 ciTypeFlow* analyzer = outer(); | |
| 1619 Arena* arena = analyzer->arena(); | |
| 1620 Block* block = NULL; | |
| 1621 bool has_successor = !has_trap() && | |
| 1622 (control() != ciBlock::fall_through_bci || limit() < analyzer->code_size()); | |
| 1623 if (!has_successor) { | |
| 1624 _successors = | |
| 1625 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1626 // No successors | |
| 1627 } else if (control() == ciBlock::fall_through_bci) { | |
| 1628 assert(str->cur_bci() == limit(), "bad block end"); | |
| 1629 // This block simply falls through to the next. | |
| 1630 _successors = | |
| 1631 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1632 | |
| 1633 Block* block = analyzer->block_at(limit(), _jsrs); | |
| 1634 assert(_successors->length() == FALL_THROUGH, ""); | |
| 1635 _successors->append(block); | |
| 1636 } else { | |
| 1637 int current_bci = str->cur_bci(); | |
| 1638 int next_bci = str->next_bci(); | |
| 1639 int branch_bci = -1; | |
| 1640 Block* target = NULL; | |
| 1641 assert(str->next_bci() == limit(), "bad block end"); | |
| 1642 // This block is not a simple fall-though. Interpret | |
| 1643 // the current bytecode to find our successors. | |
| 1644 switch (str->cur_bc()) { | |
| 1645 case Bytecodes::_ifeq: case Bytecodes::_ifne: | |
| 1646 case Bytecodes::_iflt: case Bytecodes::_ifge: | |
| 1647 case Bytecodes::_ifgt: case Bytecodes::_ifle: | |
| 1648 case Bytecodes::_if_icmpeq: case Bytecodes::_if_icmpne: | |
| 1649 case Bytecodes::_if_icmplt: case Bytecodes::_if_icmpge: | |
| 1650 case Bytecodes::_if_icmpgt: case Bytecodes::_if_icmple: | |
| 1651 case Bytecodes::_if_acmpeq: case Bytecodes::_if_acmpne: | |
| 1652 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: | |
| 1653 // Our successors are the branch target and the next bci. | |
| 1654 branch_bci = str->get_dest(); | |
| 1655 _successors = | |
| 1656 new (arena) GrowableArray<Block*>(arena, 2, 0, NULL); | |
| 1657 assert(_successors->length() == IF_NOT_TAKEN, ""); | |
| 1658 _successors->append(analyzer->block_at(next_bci, jsrs)); | |
| 1659 assert(_successors->length() == IF_TAKEN, ""); | |
| 1660 _successors->append(analyzer->block_at(branch_bci, jsrs)); | |
| 1661 break; | |
| 1662 | |
| 1663 case Bytecodes::_goto: | |
| 1664 branch_bci = str->get_dest(); | |
| 1665 _successors = | |
| 1666 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1667 assert(_successors->length() == GOTO_TARGET, ""); | |
|
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1668 _successors->append(analyzer->block_at(branch_bci, jsrs)); |
| 0 | 1669 break; |
| 1670 | |
| 1671 case Bytecodes::_jsr: | |
| 1672 branch_bci = str->get_dest(); | |
| 1673 _successors = | |
| 1674 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1675 assert(_successors->length() == GOTO_TARGET, ""); | |
| 1676 _successors->append(analyzer->block_at(branch_bci, jsrs)); | |
| 1677 break; | |
| 1678 | |
| 1679 case Bytecodes::_goto_w: | |
| 1680 case Bytecodes::_jsr_w: | |
| 1681 _successors = | |
| 1682 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1683 assert(_successors->length() == GOTO_TARGET, ""); | |
| 1684 _successors->append(analyzer->block_at(str->get_far_dest(), jsrs)); | |
| 1685 break; | |
| 1686 | |
| 1687 case Bytecodes::_tableswitch: { | |
| 1688 Bytecode_tableswitch *tableswitch = | |
| 1689 Bytecode_tableswitch_at(str->cur_bcp()); | |
| 1690 | |
| 1691 int len = tableswitch->length(); | |
| 1692 _successors = | |
| 1693 new (arena) GrowableArray<Block*>(arena, len+1, 0, NULL); | |
| 1694 int bci = current_bci + tableswitch->default_offset(); | |
| 1695 Block* block = analyzer->block_at(bci, jsrs); | |
| 1696 assert(_successors->length() == SWITCH_DEFAULT, ""); | |
| 1697 _successors->append(block); | |
| 1698 while (--len >= 0) { | |
| 1699 int bci = current_bci + tableswitch->dest_offset_at(len); | |
| 1700 block = analyzer->block_at(bci, jsrs); | |
| 1701 assert(_successors->length() >= SWITCH_CASES, ""); | |
| 1702 _successors->append_if_missing(block); | |
| 1703 } | |
| 1704 break; | |
| 1705 } | |
| 1706 | |
| 1707 case Bytecodes::_lookupswitch: { | |
| 1708 Bytecode_lookupswitch *lookupswitch = | |
| 1709 Bytecode_lookupswitch_at(str->cur_bcp()); | |
| 1710 | |
| 1711 int npairs = lookupswitch->number_of_pairs(); | |
| 1712 _successors = | |
| 1713 new (arena) GrowableArray<Block*>(arena, npairs+1, 0, NULL); | |
| 1714 int bci = current_bci + lookupswitch->default_offset(); | |
| 1715 Block* block = analyzer->block_at(bci, jsrs); | |
| 1716 assert(_successors->length() == SWITCH_DEFAULT, ""); | |
| 1717 _successors->append(block); | |
| 1718 while(--npairs >= 0) { | |
| 1719 LookupswitchPair *pair = lookupswitch->pair_at(npairs); | |
| 1720 int bci = current_bci + pair->offset(); | |
| 1721 Block* block = analyzer->block_at(bci, jsrs); | |
| 1722 assert(_successors->length() >= SWITCH_CASES, ""); | |
| 1723 _successors->append_if_missing(block); | |
| 1724 } | |
| 1725 break; | |
| 1726 } | |
| 1727 | |
| 1728 case Bytecodes::_athrow: case Bytecodes::_ireturn: | |
| 1729 case Bytecodes::_lreturn: case Bytecodes::_freturn: | |
| 1730 case Bytecodes::_dreturn: case Bytecodes::_areturn: | |
| 1731 case Bytecodes::_return: | |
| 1732 _successors = | |
| 1733 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1734 // No successors | |
| 1735 break; | |
| 1736 | |
| 1737 case Bytecodes::_ret: { | |
| 1738 _successors = | |
| 1739 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1740 | |
| 1741 Cell local = state->local(str->get_index()); | |
| 1742 ciType* return_address = state->type_at(local); | |
| 1743 assert(return_address->is_return_address(), "verify: wrong type"); | |
| 1744 int bci = return_address->as_return_address()->bci(); | |
| 1745 assert(_successors->length() == GOTO_TARGET, ""); | |
| 1746 _successors->append(analyzer->block_at(bci, jsrs)); | |
| 1747 break; | |
| 1748 } | |
| 1749 | |
| 1750 case Bytecodes::_wide: | |
| 1751 default: | |
| 1752 ShouldNotReachHere(); | |
| 1753 break; | |
| 1754 } | |
| 1755 } | |
| 1756 } | |
| 1757 return _successors; | |
| 1758 } | |
| 1759 | |
| 1760 // ------------------------------------------------------------------ | |
| 1761 // ciTypeFlow::Block:compute_exceptions | |
| 1762 // | |
| 1763 // Compute the exceptional successors and types for this Block. | |
| 1764 void ciTypeFlow::Block::compute_exceptions() { | |
| 1765 assert(_exceptions == NULL && _exc_klasses == NULL, "repeat"); | |
| 1766 | |
| 1767 if (CITraceTypeFlow) { | |
| 1768 tty->print(">> Computing exceptions for block "); | |
| 1769 print_value_on(tty); | |
| 1770 tty->cr(); | |
| 1771 } | |
| 1772 | |
| 1773 ciTypeFlow* analyzer = outer(); | |
| 1774 Arena* arena = analyzer->arena(); | |
| 1775 | |
| 1776 // Any bci in the block will do. | |
| 1777 ciExceptionHandlerStream str(analyzer->method(), start()); | |
| 1778 | |
| 1779 // Allocate our growable arrays. | |
| 1780 int exc_count = str.count(); | |
| 1781 _exceptions = new (arena) GrowableArray<Block*>(arena, exc_count, 0, NULL); | |
| 1782 _exc_klasses = new (arena) GrowableArray<ciInstanceKlass*>(arena, exc_count, | |
| 1783 0, NULL); | |
| 1784 | |
| 1785 for ( ; !str.is_done(); str.next()) { | |
| 1786 ciExceptionHandler* handler = str.handler(); | |
| 1787 int bci = handler->handler_bci(); | |
| 1788 ciInstanceKlass* klass = NULL; | |
| 1789 if (bci == -1) { | |
| 1790 // There is no catch all. It is possible to exit the method. | |
| 1791 break; | |
| 1792 } | |
| 1793 if (handler->is_catch_all()) { | |
| 1794 klass = analyzer->env()->Throwable_klass(); | |
| 1795 } else { | |
| 1796 klass = handler->catch_klass(); | |
| 1797 } | |
| 1798 _exceptions->append(analyzer->block_at(bci, _jsrs)); | |
| 1799 _exc_klasses->append(klass); | |
| 1800 } | |
| 1801 } | |
| 1802 | |
| 1803 // ------------------------------------------------------------------ | |
|
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1804 // ciTypeFlow::Block::set_backedge_copy |
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1805 // Use this only to make a pre-existing public block into a backedge copy. |
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1806 void ciTypeFlow::Block::set_backedge_copy(bool z) { |
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1807 assert(z || (z == is_backedge_copy()), "cannot make a backedge copy public"); |
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1808 _backedge_copy = z; |
| 0 | 1809 } |
| 1810 | |
| 1811 // ------------------------------------------------------------------ | |
|
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1812 // ciTypeFlow::Block::is_clonable_exit |
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1813 // |
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1814 // At most 2 normal successors, one of which continues looping, |
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1815 // and all exceptional successors must exit. |
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1816 bool ciTypeFlow::Block::is_clonable_exit(ciTypeFlow::Loop* lp) { |
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1817 int normal_cnt = 0; |
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1818 int in_loop_cnt = 0; |
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1819 for (SuccIter iter(this); !iter.done(); iter.next()) { |
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1820 Block* succ = iter.succ(); |
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1821 if (iter.is_normal_ctrl()) { |
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1822 if (++normal_cnt > 2) return false; |
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1823 if (lp->contains(succ->loop())) { |
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1824 if (++in_loop_cnt > 1) return false; |
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1825 } |
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1826 } else { |
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1827 if (lp->contains(succ->loop())) return false; |
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1828 } |
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1829 } |
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1830 return in_loop_cnt == 1; |
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1831 } |
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1832 |
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1833 // ------------------------------------------------------------------ |
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1834 // ciTypeFlow::Block::looping_succ |
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1835 // |
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1836 ciTypeFlow::Block* ciTypeFlow::Block::looping_succ(ciTypeFlow::Loop* lp) { |
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1837 assert(successors()->length() <= 2, "at most 2 normal successors"); |
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1838 for (SuccIter iter(this); !iter.done(); iter.next()) { |
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1839 Block* succ = iter.succ(); |
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1840 if (lp->contains(succ->loop())) { |
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1841 return succ; |
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1842 } |
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1843 } |
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1844 return NULL; |
| 0 | 1845 } |
| 1846 | |
| 1847 #ifndef PRODUCT | |
| 1848 // ------------------------------------------------------------------ | |
| 1849 // ciTypeFlow::Block::print_value_on | |
| 1850 void ciTypeFlow::Block::print_value_on(outputStream* st) const { | |
|
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1851 if (has_pre_order()) st->print("#%-2d ", pre_order()); |
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1852 if (has_rpo()) st->print("rpo#%-2d ", rpo()); |
| 0 | 1853 st->print("[%d - %d)", start(), limit()); |
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1854 if (is_loop_head()) st->print(" lphd"); |
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1855 if (is_irreducible_entry()) st->print(" irred"); |
| 0 | 1856 if (_jsrs->size() > 0) { st->print("/"); _jsrs->print_on(st); } |
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1857 if (is_backedge_copy()) st->print("/backedge_copy"); |
| 0 | 1858 } |
| 1859 | |
| 1860 // ------------------------------------------------------------------ | |
| 1861 // ciTypeFlow::Block::print_on | |
| 1862 void ciTypeFlow::Block::print_on(outputStream* st) const { | |
| 1863 if ((Verbose || WizardMode)) { | |
| 1864 outer()->method()->print_codes_on(start(), limit(), st); | |
| 1865 } | |
| 1866 st->print_cr(" ==================================================== "); | |
| 1867 st->print (" "); | |
| 1868 print_value_on(st); | |
|
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1869 st->print(" Stored locals: "); def_locals()->print_on(st, outer()->method()->max_locals()); tty->cr(); |
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1870 if (loop() && loop()->parent() != NULL) { |
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1871 st->print(" loops:"); |
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1872 Loop* lp = loop(); |
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1873 do { |
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1874 st->print(" %d<-%d", lp->head()->pre_order(),lp->tail()->pre_order()); |
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1875 if (lp->is_irreducible()) st->print("(ir)"); |
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1876 lp = lp->parent(); |
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1877 } while (lp->parent() != NULL); |
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1878 } |
| 0 | 1879 st->cr(); |
| 1880 _state->print_on(st); | |
| 1881 if (_successors == NULL) { | |
| 1882 st->print_cr(" No successor information"); | |
| 1883 } else { | |
| 1884 int num_successors = _successors->length(); | |
| 1885 st->print_cr(" Successors : %d", num_successors); | |
| 1886 for (int i = 0; i < num_successors; i++) { | |
| 1887 Block* successor = _successors->at(i); | |
| 1888 st->print(" "); | |
| 1889 successor->print_value_on(st); | |
| 1890 st->cr(); | |
| 1891 } | |
| 1892 } | |
| 1893 if (_exceptions == NULL) { | |
| 1894 st->print_cr(" No exception information"); | |
| 1895 } else { | |
| 1896 int num_exceptions = _exceptions->length(); | |
| 1897 st->print_cr(" Exceptions : %d", num_exceptions); | |
| 1898 for (int i = 0; i < num_exceptions; i++) { | |
| 1899 Block* exc_succ = _exceptions->at(i); | |
| 1900 ciInstanceKlass* exc_klass = _exc_klasses->at(i); | |
| 1901 st->print(" "); | |
| 1902 exc_succ->print_value_on(st); | |
| 1903 st->print(" -- "); | |
| 1904 exc_klass->name()->print_symbol_on(st); | |
| 1905 st->cr(); | |
| 1906 } | |
| 1907 } | |
| 1908 if (has_trap()) { | |
| 1909 st->print_cr(" Traps on %d with trap index %d", trap_bci(), trap_index()); | |
| 1910 } | |
| 1911 st->print_cr(" ==================================================== "); | |
| 1912 } | |
| 1913 #endif | |
| 1914 | |
|
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1915 #ifndef PRODUCT |
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1916 // ------------------------------------------------------------------ |
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1917 // ciTypeFlow::LocalSet::print_on |
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1918 void ciTypeFlow::LocalSet::print_on(outputStream* st, int limit) const { |
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1919 st->print("{"); |
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1920 for (int i = 0; i < max; i++) { |
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1921 if (test(i)) st->print(" %d", i); |
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1922 } |
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1923 if (limit > max) { |
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1924 st->print(" %d..%d ", max, limit); |
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1925 } |
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1926 st->print(" }"); |
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1927 } |
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1928 #endif |
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1929 |
| 0 | 1930 // ciTypeFlow |
| 1931 // | |
| 1932 // This is a pass over the bytecodes which computes the following: | |
| 1933 // basic block structure | |
| 1934 // interpreter type-states (a la the verifier) | |
| 1935 | |
| 1936 // ------------------------------------------------------------------ | |
| 1937 // ciTypeFlow::ciTypeFlow | |
| 1938 ciTypeFlow::ciTypeFlow(ciEnv* env, ciMethod* method, int osr_bci) { | |
| 1939 _env = env; | |
| 1940 _method = method; | |
| 1941 _methodBlocks = method->get_method_blocks(); | |
| 1942 _max_locals = method->max_locals(); | |
| 1943 _max_stack = method->max_stack(); | |
| 1944 _code_size = method->code_size(); | |
|
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1945 _has_irreducible_entry = false; |
| 0 | 1946 _osr_bci = osr_bci; |
| 1947 _failure_reason = NULL; | |
| 1948 assert(start_bci() >= 0 && start_bci() < code_size() , "correct osr_bci argument"); | |
| 1949 _work_list = NULL; | |
| 1950 | |
| 1951 _ciblock_count = _methodBlocks->num_blocks(); | |
| 1952 _idx_to_blocklist = NEW_ARENA_ARRAY(arena(), GrowableArray<Block*>*, _ciblock_count); | |
| 1953 for (int i = 0; i < _ciblock_count; i++) { | |
| 1954 _idx_to_blocklist[i] = NULL; | |
| 1955 } | |
| 1956 _block_map = NULL; // until all blocks are seen | |
| 1957 _jsr_count = 0; | |
| 1958 _jsr_records = NULL; | |
| 1959 } | |
| 1960 | |
| 1961 // ------------------------------------------------------------------ | |
| 1962 // ciTypeFlow::work_list_next | |
| 1963 // | |
| 1964 // Get the next basic block from our work list. | |
| 1965 ciTypeFlow::Block* ciTypeFlow::work_list_next() { | |
| 1966 assert(!work_list_empty(), "work list must not be empty"); | |
| 1967 Block* next_block = _work_list; | |
| 1968 _work_list = next_block->next(); | |
| 1969 next_block->set_next(NULL); | |
| 1970 next_block->set_on_work_list(false); | |
| 1971 return next_block; | |
| 1972 } | |
| 1973 | |
| 1974 // ------------------------------------------------------------------ | |
| 1975 // ciTypeFlow::add_to_work_list | |
| 1976 // | |
| 1977 // Add a basic block to our work list. | |
|
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1978 // List is sorted by decreasing postorder sort (same as increasing RPO) |
| 0 | 1979 void ciTypeFlow::add_to_work_list(ciTypeFlow::Block* block) { |
| 1980 assert(!block->is_on_work_list(), "must not already be on work list"); | |
| 1981 | |
| 1982 if (CITraceTypeFlow) { | |
|
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1983 tty->print(">> Adding block "); |
| 0 | 1984 block->print_value_on(tty); |
| 1985 tty->print_cr(" to the work list : "); | |
| 1986 } | |
| 1987 | |
| 1988 block->set_on_work_list(true); | |
|
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1989 |
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1990 // decreasing post order sort |
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1991 |
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1992 Block* prev = NULL; |
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1993 Block* current = _work_list; |
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1994 int po = block->post_order(); |
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1995 while (current != NULL) { |
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1996 if (!current->has_post_order() || po > current->post_order()) |
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1997 break; |
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1998 prev = current; |
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1999 current = current->next(); |
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2000 } |
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2001 if (prev == NULL) { |
| 0 | 2002 block->set_next(_work_list); |
| 2003 _work_list = block; | |
| 2004 } else { | |
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2005 block->set_next(current); |
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2006 prev->set_next(block); |
| 0 | 2007 } |
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2008 |
| 0 | 2009 if (CITraceTypeFlow) { |
| 2010 tty->cr(); | |
| 2011 } | |
| 2012 } | |
| 2013 | |
| 2014 // ------------------------------------------------------------------ | |
| 2015 // ciTypeFlow::block_at | |
| 2016 // | |
| 2017 // Return the block beginning at bci which has a JsrSet compatible | |
| 2018 // with jsrs. | |
| 2019 ciTypeFlow::Block* ciTypeFlow::block_at(int bci, ciTypeFlow::JsrSet* jsrs, CreateOption option) { | |
| 2020 // First find the right ciBlock. | |
| 2021 if (CITraceTypeFlow) { | |
| 2022 tty->print(">> Requesting block for %d/", bci); | |
| 2023 jsrs->print_on(tty); | |
| 2024 tty->cr(); | |
| 2025 } | |
| 2026 | |
| 2027 ciBlock* ciblk = _methodBlocks->block_containing(bci); | |
| 2028 assert(ciblk->start_bci() == bci, "bad ciBlock boundaries"); | |
| 2029 Block* block = get_block_for(ciblk->index(), jsrs, option); | |
| 2030 | |
|
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2031 assert(block == NULL? (option == no_create): block->is_backedge_copy() == (option == create_backedge_copy), "create option consistent with result"); |
| 0 | 2032 |
| 2033 if (CITraceTypeFlow) { | |
| 2034 if (block != NULL) { | |
| 2035 tty->print(">> Found block "); | |
| 2036 block->print_value_on(tty); | |
| 2037 tty->cr(); | |
| 2038 } else { | |
| 2039 tty->print_cr(">> No such block."); | |
| 2040 } | |
| 2041 } | |
| 2042 | |
| 2043 return block; | |
| 2044 } | |
| 2045 | |
| 2046 // ------------------------------------------------------------------ | |
| 2047 // ciTypeFlow::make_jsr_record | |
| 2048 // | |
| 2049 // Make a JsrRecord for a given (entry, return) pair, if such a record | |
| 2050 // does not already exist. | |
| 2051 ciTypeFlow::JsrRecord* ciTypeFlow::make_jsr_record(int entry_address, | |
| 2052 int return_address) { | |
| 2053 if (_jsr_records == NULL) { | |
| 2054 _jsr_records = new (arena()) GrowableArray<JsrRecord*>(arena(), | |
| 2055 _jsr_count, | |
| 2056 0, | |
| 2057 NULL); | |
| 2058 } | |
| 2059 JsrRecord* record = NULL; | |
| 2060 int len = _jsr_records->length(); | |
| 2061 for (int i = 0; i < len; i++) { | |
| 2062 JsrRecord* record = _jsr_records->at(i); | |
| 2063 if (record->entry_address() == entry_address && | |
| 2064 record->return_address() == return_address) { | |
| 2065 return record; | |
| 2066 } | |
| 2067 } | |
| 2068 | |
| 2069 record = new (arena()) JsrRecord(entry_address, return_address); | |
| 2070 _jsr_records->append(record); | |
| 2071 return record; | |
| 2072 } | |
| 2073 | |
| 2074 // ------------------------------------------------------------------ | |
| 2075 // ciTypeFlow::flow_exceptions | |
| 2076 // | |
| 2077 // Merge the current state into all exceptional successors at the | |
| 2078 // current point in the code. | |
| 2079 void ciTypeFlow::flow_exceptions(GrowableArray<ciTypeFlow::Block*>* exceptions, | |
| 2080 GrowableArray<ciInstanceKlass*>* exc_klasses, | |
| 2081 ciTypeFlow::StateVector* state) { | |
| 2082 int len = exceptions->length(); | |
| 2083 assert(exc_klasses->length() == len, "must have same length"); | |
| 2084 for (int i = 0; i < len; i++) { | |
| 2085 Block* block = exceptions->at(i); | |
| 2086 ciInstanceKlass* exception_klass = exc_klasses->at(i); | |
| 2087 | |
| 2088 if (!exception_klass->is_loaded()) { | |
| 2089 // Do not compile any code for unloaded exception types. | |
| 2090 // Following compiler passes are responsible for doing this also. | |
| 2091 continue; | |
| 2092 } | |
| 2093 | |
| 2094 if (block->meet_exception(exception_klass, state)) { | |
|
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2095 // Block was modified and has PO. Add it to the work list. |
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2096 if (block->has_post_order() && |
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2097 !block->is_on_work_list()) { |
| 0 | 2098 add_to_work_list(block); |
| 2099 } | |
| 2100 } | |
| 2101 } | |
| 2102 } | |
| 2103 | |
| 2104 // ------------------------------------------------------------------ | |
| 2105 // ciTypeFlow::flow_successors | |
| 2106 // | |
| 2107 // Merge the current state into all successors at the current point | |
| 2108 // in the code. | |
| 2109 void ciTypeFlow::flow_successors(GrowableArray<ciTypeFlow::Block*>* successors, | |
| 2110 ciTypeFlow::StateVector* state) { | |
| 2111 int len = successors->length(); | |
| 2112 for (int i = 0; i < len; i++) { | |
| 2113 Block* block = successors->at(i); | |
| 2114 if (block->meet(state)) { | |
|
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2115 // Block was modified and has PO. Add it to the work list. |
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2116 if (block->has_post_order() && |
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2117 !block->is_on_work_list()) { |
| 0 | 2118 add_to_work_list(block); |
| 2119 } | |
| 2120 } | |
| 2121 } | |
| 2122 } | |
| 2123 | |
| 2124 // ------------------------------------------------------------------ | |
| 2125 // ciTypeFlow::can_trap | |
| 2126 // | |
| 2127 // Tells if a given instruction is able to generate an exception edge. | |
| 2128 bool ciTypeFlow::can_trap(ciBytecodeStream& str) { | |
| 2129 // Cf. GenerateOopMap::do_exception_edge. | |
| 2130 if (!Bytecodes::can_trap(str.cur_bc())) return false; | |
| 2131 | |
| 2132 switch (str.cur_bc()) { | |
| 1565 | 2133 // %%% FIXME: ldc of Class can generate an exception |
| 0 | 2134 case Bytecodes::_ldc: |
| 2135 case Bytecodes::_ldc_w: | |
| 2136 case Bytecodes::_ldc2_w: | |
| 2137 case Bytecodes::_aload_0: | |
| 2138 // These bytecodes can trap for rewriting. We need to assume that | |
| 2139 // they do not throw exceptions to make the monitor analysis work. | |
| 2140 return false; | |
| 2141 | |
| 2142 case Bytecodes::_ireturn: | |
| 2143 case Bytecodes::_lreturn: | |
| 2144 case Bytecodes::_freturn: | |
| 2145 case Bytecodes::_dreturn: | |
| 2146 case Bytecodes::_areturn: | |
| 2147 case Bytecodes::_return: | |
| 2148 // We can assume the monitor stack is empty in this analysis. | |
| 2149 return false; | |
| 2150 | |
| 2151 case Bytecodes::_monitorexit: | |
| 2152 // We can assume monitors are matched in this analysis. | |
| 2153 return false; | |
| 2154 } | |
| 2155 | |
| 2156 return true; | |
| 2157 } | |
| 2158 | |
|
367
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2159 // ------------------------------------------------------------------ |
|
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2160 // ciTypeFlow::clone_loop_heads |
|
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2161 // |
|
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2162 // Clone the loop heads |
|
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2163 bool ciTypeFlow::clone_loop_heads(Loop* lp, StateVector* temp_vector, JsrSet* temp_set) { |
|
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2164 bool rslt = false; |
|
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2165 for (PreorderLoops iter(loop_tree_root()); !iter.done(); iter.next()) { |
|
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2166 lp = iter.current(); |
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2167 Block* head = lp->head(); |
|
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2168 if (lp == loop_tree_root() || |
|
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2169 lp->is_irreducible() || |
|
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2170 !head->is_clonable_exit(lp)) |
|
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2171 continue; |
|
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2172 |
|
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2173 // check not already cloned |
|
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2174 if (head->backedge_copy_count() != 0) |
|
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2175 continue; |
|
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2176 |
|
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2177 // check _no_ shared head below us |
|
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2178 Loop* ch; |
|
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2179 for (ch = lp->child(); ch != NULL && ch->head() != head; ch = ch->sibling()); |
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2180 if (ch != NULL) |
|
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2181 continue; |
|
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2182 |
|
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2183 // Clone head |
|
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2184 Block* new_head = head->looping_succ(lp); |
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2185 Block* clone = clone_loop_head(lp, temp_vector, temp_set); |
|
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2186 // Update lp's info |
|
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2187 clone->set_loop(lp); |
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2188 lp->set_head(new_head); |
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2189 lp->set_tail(clone); |
|
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2190 // And move original head into outer loop |
|
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2191 head->set_loop(lp->parent()); |
|
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2192 |
|
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2193 rslt = true; |
|
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2194 } |
|
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2195 return rslt; |
|
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2196 } |
|
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|
2197 |
|
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|
2198 // ------------------------------------------------------------------ |
|
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2199 // ciTypeFlow::clone_loop_head |
|
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2200 // |
|
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2201 // Clone lp's head and replace tail's successors with clone. |
|
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2202 // |
|
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2203 // | |
|
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2204 // v |
|
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2205 // head <-> body |
|
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2206 // | |
|
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2207 // v |
|
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2208 // exit |
|
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2209 // |
|
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|
2210 // new_head |
|
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2211 // |
|
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2212 // | |
|
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2213 // v |
|
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2214 // head ----------\ |
|
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2215 // | | |
|
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2216 // | v |
|
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2217 // | clone <-> body |
|
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2218 // | | |
|
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2219 // | /--/ |
|
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2220 // | | |
|
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2221 // v v |
|
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|
2222 // exit |
|
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|
2223 // |
|
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2224 ciTypeFlow::Block* ciTypeFlow::clone_loop_head(Loop* lp, StateVector* temp_vector, JsrSet* temp_set) { |
|
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2225 Block* head = lp->head(); |
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2226 Block* tail = lp->tail(); |
|
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2227 if (CITraceTypeFlow) { |
|
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|
2228 tty->print(">> Requesting clone of loop head "); head->print_value_on(tty); |
|
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2229 tty->print(" for predecessor "); tail->print_value_on(tty); |
|
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2230 tty->cr(); |
|
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|
2231 } |
|
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|
2232 Block* clone = block_at(head->start(), head->jsrs(), create_backedge_copy); |
|
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2233 assert(clone->backedge_copy_count() == 1, "one backedge copy for all back edges"); |
|
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2234 |
|
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|
2235 assert(!clone->has_pre_order(), "just created"); |
|
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|
2236 clone->set_next_pre_order(); |
|
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|
2237 |
|
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|
2238 // Insert clone after (orig) tail in reverse post order |
|
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2239 clone->set_rpo_next(tail->rpo_next()); |
|
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|
2240 tail->set_rpo_next(clone); |
|
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|
2241 |
|
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|
2242 // tail->head becomes tail->clone |
|
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2243 for (SuccIter iter(tail); !iter.done(); iter.next()) { |
|
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2244 if (iter.succ() == head) { |
|
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|
2245 iter.set_succ(clone); |
|
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|
2246 } |
|
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|
2247 } |
|
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|
2248 flow_block(tail, temp_vector, temp_set); |
|
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|
2249 if (head == tail) { |
|
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|
2250 // For self-loops, clone->head becomes clone->clone |
|
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|
2251 flow_block(clone, temp_vector, temp_set); |
|
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2252 for (SuccIter iter(clone); !iter.done(); iter.next()) { |
|
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|
2253 if (iter.succ() == head) { |
|
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|
2254 iter.set_succ(clone); |
|
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|
2255 break; |
|
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|
2256 } |
|
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|
2257 } |
|
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|
2258 } |
|
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|
2259 flow_block(clone, temp_vector, temp_set); |
|
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|
2260 |
|
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|
2261 return clone; |
|
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|
2262 } |
| 0 | 2263 |
| 2264 // ------------------------------------------------------------------ | |
| 2265 // ciTypeFlow::flow_block | |
| 2266 // | |
| 2267 // Interpret the effects of the bytecodes on the incoming state | |
| 2268 // vector of a basic block. Push the changed state to succeeding | |
| 2269 // basic blocks. | |
| 2270 void ciTypeFlow::flow_block(ciTypeFlow::Block* block, | |
| 2271 ciTypeFlow::StateVector* state, | |
| 2272 ciTypeFlow::JsrSet* jsrs) { | |
| 2273 if (CITraceTypeFlow) { | |
| 2274 tty->print("\n>> ANALYZING BLOCK : "); | |
| 2275 tty->cr(); | |
| 2276 block->print_on(tty); | |
| 2277 } | |
| 2278 assert(block->has_pre_order(), "pre-order is assigned before 1st flow"); | |
| 2279 | |
| 2280 int start = block->start(); | |
| 2281 int limit = block->limit(); | |
| 2282 int control = block->control(); | |
| 2283 if (control != ciBlock::fall_through_bci) { | |
| 2284 limit = control; | |
| 2285 } | |
| 2286 | |
| 2287 // Grab the state from the current block. | |
| 2288 block->copy_state_into(state); | |
|
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|
2289 state->def_locals()->clear(); |
| 0 | 2290 |
| 2291 GrowableArray<Block*>* exceptions = block->exceptions(); | |
| 2292 GrowableArray<ciInstanceKlass*>* exc_klasses = block->exc_klasses(); | |
| 2293 bool has_exceptions = exceptions->length() > 0; | |
| 2294 | |
|
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|
2295 bool exceptions_used = false; |
|
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2296 |
| 0 | 2297 ciBytecodeStream str(method()); |
| 2298 str.reset_to_bci(start); | |
| 2299 Bytecodes::Code code; | |
| 2300 while ((code = str.next()) != ciBytecodeStream::EOBC() && | |
| 2301 str.cur_bci() < limit) { | |
| 2302 // Check for exceptional control flow from this point. | |
| 2303 if (has_exceptions && can_trap(str)) { | |
| 2304 flow_exceptions(exceptions, exc_klasses, state); | |
|
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|
2305 exceptions_used = true; |
| 0 | 2306 } |
| 2307 // Apply the effects of the current bytecode to our state. | |
| 2308 bool res = state->apply_one_bytecode(&str); | |
| 2309 | |
| 2310 // Watch for bailouts. | |
| 2311 if (failing()) return; | |
| 2312 | |
| 2313 if (res) { | |
| 2314 | |
| 2315 // We have encountered a trap. Record it in this block. | |
| 2316 block->set_trap(state->trap_bci(), state->trap_index()); | |
| 2317 | |
| 2318 if (CITraceTypeFlow) { | |
| 2319 tty->print_cr(">> Found trap"); | |
| 2320 block->print_on(tty); | |
| 2321 } | |
| 2322 | |
|
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2323 // Save set of locals defined in this block |
|
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2324 block->def_locals()->add(state->def_locals()); |
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2325 |
| 0 | 2326 // Record (no) successors. |
| 2327 block->successors(&str, state, jsrs); | |
| 2328 | |
|
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2329 assert(!has_exceptions || exceptions_used, "Not removing exceptions"); |
|
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2330 |
| 0 | 2331 // Discontinue interpretation of this Block. |
| 2332 return; | |
| 2333 } | |
| 2334 } | |
| 2335 | |
| 2336 GrowableArray<Block*>* successors = NULL; | |
| 2337 if (control != ciBlock::fall_through_bci) { | |
| 2338 // Check for exceptional control flow from this point. | |
| 2339 if (has_exceptions && can_trap(str)) { | |
| 2340 flow_exceptions(exceptions, exc_klasses, state); | |
|
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|
2341 exceptions_used = true; |
| 0 | 2342 } |
| 2343 | |
| 2344 // Fix the JsrSet to reflect effect of the bytecode. | |
| 2345 block->copy_jsrs_into(jsrs); | |
| 2346 jsrs->apply_control(this, &str, state); | |
| 2347 | |
| 2348 // Find successor edges based on old state and new JsrSet. | |
| 2349 successors = block->successors(&str, state, jsrs); | |
| 2350 | |
| 2351 // Apply the control changes to the state. | |
| 2352 state->apply_one_bytecode(&str); | |
| 2353 } else { | |
| 2354 // Fall through control | |
| 2355 successors = block->successors(&str, NULL, NULL); | |
| 2356 } | |
| 2357 | |
|
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2358 // Save set of locals defined in this block |
|
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|
2359 block->def_locals()->add(state->def_locals()); |
|
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2360 |
|
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|
2361 // Remove untaken exception paths |
|
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2362 if (!exceptions_used) |
|
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|
2363 exceptions->clear(); |
|
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|
2364 |
| 0 | 2365 // Pass our state to successors. |
| 2366 flow_successors(successors, state); | |
| 2367 } | |
| 2368 | |
| 2369 // ------------------------------------------------------------------ | |
|
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|
2370 // ciTypeFlow::PostOrderLoops::next |
|
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|
2371 // |
|
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|
2372 // Advance to next loop tree using a postorder, left-to-right traversal. |
|
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|
2373 void ciTypeFlow::PostorderLoops::next() { |
|
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|
2374 assert(!done(), "must not be done."); |
|
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|
2375 if (_current->sibling() != NULL) { |
|
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|
2376 _current = _current->sibling(); |
|
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|
2377 while (_current->child() != NULL) { |
|
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|
2378 _current = _current->child(); |
|
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|
2379 } |
|
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|
2380 } else { |
|
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|
2381 _current = _current->parent(); |
|
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|
2382 } |
|
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|
2383 } |
|
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|
2384 |
|
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|
2385 // ------------------------------------------------------------------ |
|
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|
2386 // ciTypeFlow::PreOrderLoops::next |
|
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|
2387 // |
|
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|
2388 // Advance to next loop tree using a preorder, left-to-right traversal. |
|
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|
2389 void ciTypeFlow::PreorderLoops::next() { |
|
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|
2390 assert(!done(), "must not be done."); |
|
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|
2391 if (_current->child() != NULL) { |
|
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|
2392 _current = _current->child(); |
|
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|
2393 } else if (_current->sibling() != NULL) { |
|
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|
2394 _current = _current->sibling(); |
|
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|
2395 } else { |
|
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|
2396 while (_current != _root && _current->sibling() == NULL) { |
|
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|
2397 _current = _current->parent(); |
|
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|
2398 } |
|
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|
2399 if (_current == _root) { |
|
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|
2400 _current = NULL; |
|
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|
2401 assert(done(), "must be done."); |
|
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|
2402 } else { |
|
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|
2403 assert(_current->sibling() != NULL, "must be more to do"); |
|
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|
2404 _current = _current->sibling(); |
|
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|
2405 } |
|
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|
2406 } |
|
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|
2407 } |
|
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|
2408 |
|
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|
2409 // ------------------------------------------------------------------ |
|
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|
2410 // ciTypeFlow::Loop::sorted_merge |
|
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|
2411 // |
|
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|
2412 // Merge the branch lp into this branch, sorting on the loop head |
|
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|
2413 // pre_orders. Returns the leaf of the merged branch. |
|
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|
2414 // Child and sibling pointers will be setup later. |
|
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|
2415 // Sort is (looking from leaf towards the root) |
|
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|
2416 // descending on primary key: loop head's pre_order, and |
|
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|
2417 // ascending on secondary key: loop tail's pre_order. |
|
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|
2418 ciTypeFlow::Loop* ciTypeFlow::Loop::sorted_merge(Loop* lp) { |
|
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|
2419 Loop* leaf = this; |
|
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|
2420 Loop* prev = NULL; |
|
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|
2421 Loop* current = leaf; |
|
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|
2422 while (lp != NULL) { |
|
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|
2423 int lp_pre_order = lp->head()->pre_order(); |
|
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|
2424 // Find insertion point for "lp" |
|
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|
2425 while (current != NULL) { |
|
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|
2426 if (current == lp) |
|
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|
2427 return leaf; // Already in list |
|
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|
2428 if (current->head()->pre_order() < lp_pre_order) |
|
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|
2429 break; |
|
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|
2430 if (current->head()->pre_order() == lp_pre_order && |
|
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|
2431 current->tail()->pre_order() > lp->tail()->pre_order()) { |
|
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|
2432 break; |
|
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|
2433 } |
|
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|
2434 prev = current; |
|
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|
2435 current = current->parent(); |
|
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|
2436 } |
|
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|
2437 Loop* next_lp = lp->parent(); // Save future list of items to insert |
|
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|
2438 // Insert lp before current |
|
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|
2439 lp->set_parent(current); |
|
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|
2440 if (prev != NULL) { |
|
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|
2441 prev->set_parent(lp); |
|
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|
2442 } else { |
|
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|
2443 leaf = lp; |
|
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|
2444 } |
|
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|
2445 prev = lp; // Inserted item is new prev[ious] |
|
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|
2446 lp = next_lp; // Next item to insert |
|
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|
2447 } |
|
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|
2448 return leaf; |
|
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|
2449 } |
|
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|
2450 |
|
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|
2451 // ------------------------------------------------------------------ |
|
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|
2452 // ciTypeFlow::build_loop_tree |
|
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|
2453 // |
|
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|
2454 // Incrementally build loop tree. |
|
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|
2455 void ciTypeFlow::build_loop_tree(Block* blk) { |
|
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|
2456 assert(!blk->is_post_visited(), "precondition"); |
|
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|
2457 Loop* innermost = NULL; // merge of loop tree branches over all successors |
|
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|
2458 |
|
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|
2459 for (SuccIter iter(blk); !iter.done(); iter.next()) { |
|
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|
2460 Loop* lp = NULL; |
|
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|
2461 Block* succ = iter.succ(); |
|
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|
2462 if (!succ->is_post_visited()) { |
|
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|
2463 // Found backedge since predecessor post visited, but successor is not |
|
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|
2464 assert(succ->pre_order() <= blk->pre_order(), "should be backedge"); |
|
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|
2465 |
|
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|
2466 // Create a LoopNode to mark this loop. |
|
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|
2467 lp = new (arena()) Loop(succ, blk); |
|
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|
2468 if (succ->loop() == NULL) |
|
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|
2469 succ->set_loop(lp); |
|
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|
2470 // succ->loop will be updated to innermost loop on a later call, when blk==succ |
|
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|
2471 |
|
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|
2472 } else { // Nested loop |
|
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|
2473 lp = succ->loop(); |
|
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|
2474 |
|
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|
2475 // If succ is loop head, find outer loop. |
|
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|
2476 while (lp != NULL && lp->head() == succ) { |
|
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|
2477 lp = lp->parent(); |
|
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|
2478 } |
|
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|
2479 if (lp == NULL) { |
|
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|
2480 // Infinite loop, it's parent is the root |
|
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|
2481 lp = loop_tree_root(); |
|
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|
2482 } |
|
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|
2483 } |
|
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|
2484 |
|
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|
2485 // Check for irreducible loop. |
|
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|
2486 // Successor has already been visited. If the successor's loop head |
|
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|
2487 // has already been post-visited, then this is another entry into the loop. |
|
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|
2488 while (lp->head()->is_post_visited() && lp != loop_tree_root()) { |
|
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|
2489 _has_irreducible_entry = true; |
|
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|
2490 lp->set_irreducible(succ); |
|
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|
2491 if (!succ->is_on_work_list()) { |
|
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|
2492 // Assume irreducible entries need more data flow |
|
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|
2493 add_to_work_list(succ); |
|
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|
2494 } |
| 991 | 2495 Loop* plp = lp->parent(); |
| 2496 if (plp == NULL) { | |
| 2497 // This only happens for some irreducible cases. The parent | |
| 2498 // will be updated during a later pass. | |
| 2499 break; | |
| 2500 } | |
| 2501 lp = plp; | |
|
367
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|
2502 } |
|
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|
2503 |
|
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|
2504 // Merge loop tree branch for all successors. |
|
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|
2505 innermost = innermost == NULL ? lp : innermost->sorted_merge(lp); |
|
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|
2506 |
|
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|
2507 } // end loop |
|
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|
2508 |
|
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|
2509 if (innermost == NULL) { |
|
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|
2510 assert(blk->successors()->length() == 0, "CFG exit"); |
|
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|
2511 blk->set_loop(loop_tree_root()); |
|
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|
2512 } else if (innermost->head() == blk) { |
|
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|
2513 // If loop header, complete the tree pointers |
|
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|
2514 if (blk->loop() != innermost) { |
|
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|
2515 #if ASSERT |
|
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|
2516 assert(blk->loop()->head() == innermost->head(), "same head"); |
|
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|
2517 Loop* dl; |
|
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|
2518 for (dl = innermost; dl != NULL && dl != blk->loop(); dl = dl->parent()); |
|
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|
2519 assert(dl == blk->loop(), "blk->loop() already in innermost list"); |
|
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|
2520 #endif |
|
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|
2521 blk->set_loop(innermost); |
|
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|
2522 } |
|
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|
2523 innermost->def_locals()->add(blk->def_locals()); |
|
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|
2524 Loop* l = innermost; |
|
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|
2525 Loop* p = l->parent(); |
|
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|
2526 while (p && l->head() == blk) { |
|
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|
2527 l->set_sibling(p->child()); // Put self on parents 'next child' |
|
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|
2528 p->set_child(l); // Make self the first child of parent |
|
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|
2529 p->def_locals()->add(l->def_locals()); |
|
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|
2530 l = p; // Walk up the parent chain |
|
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diff
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|
2531 p = l->parent(); |
|
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0
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|
2532 } |
|
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0
diff
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|
2533 } else { |
|
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0
diff
changeset
|
2534 blk->set_loop(innermost); |
|
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changeset
|
2535 innermost->def_locals()->add(blk->def_locals()); |
|
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0
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|
2536 } |
|
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0
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|
2537 } |
|
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parents:
0
diff
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|
2538 |
|
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0
diff
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|
2539 // ------------------------------------------------------------------ |
|
194b8e3a2fc4
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0
diff
changeset
|
2540 // ciTypeFlow::Loop::contains |
|
194b8e3a2fc4
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0
diff
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|
2541 // |
|
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0
diff
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|
2542 // Returns true if lp is nested loop. |
|
194b8e3a2fc4
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0
diff
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|
2543 bool ciTypeFlow::Loop::contains(ciTypeFlow::Loop* lp) const { |
|
194b8e3a2fc4
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changeset
|
2544 assert(lp != NULL, ""); |
|
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|
2545 if (this == lp || head() == lp->head()) return true; |
|
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|
2546 int depth1 = depth(); |
|
194b8e3a2fc4
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0
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|
2547 int depth2 = lp->depth(); |
|
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0
diff
changeset
|
2548 if (depth1 > depth2) |
|
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0
diff
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|
2549 return false; |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2550 while (depth1 < depth2) { |
|
194b8e3a2fc4
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0
diff
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|
2551 depth2--; |
|
194b8e3a2fc4
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0
diff
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|
2552 lp = lp->parent(); |
|
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0
diff
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|
2553 } |
|
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parents:
0
diff
changeset
|
2554 return this == lp; |
|
194b8e3a2fc4
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0
diff
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|
2555 } |
|
194b8e3a2fc4
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parents:
0
diff
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|
2556 |
|
194b8e3a2fc4
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0
diff
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|
2557 // ------------------------------------------------------------------ |
|
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0
diff
changeset
|
2558 // ciTypeFlow::Loop::depth |
|
194b8e3a2fc4
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parents:
0
diff
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|
2559 // |
|
194b8e3a2fc4
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parents:
0
diff
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|
2560 // Loop depth |
|
194b8e3a2fc4
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0
diff
changeset
|
2561 int ciTypeFlow::Loop::depth() const { |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2562 int dp = 0; |
|
194b8e3a2fc4
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0
diff
changeset
|
2563 for (Loop* lp = this->parent(); lp != NULL; lp = lp->parent()) |
|
194b8e3a2fc4
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0
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|
2564 dp++; |
|
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0
diff
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|
2565 return dp; |
|
194b8e3a2fc4
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0
diff
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|
2566 } |
|
194b8e3a2fc4
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0
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|
2567 |
|
194b8e3a2fc4
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0
diff
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|
2568 #ifndef PRODUCT |
|
194b8e3a2fc4
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0
diff
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|
2569 // ------------------------------------------------------------------ |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2570 // ciTypeFlow::Loop::print |
|
194b8e3a2fc4
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never
parents:
0
diff
changeset
|
2571 void ciTypeFlow::Loop::print(outputStream* st, int indent) const { |
|
194b8e3a2fc4
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never
parents:
0
diff
changeset
|
2572 for (int i = 0; i < indent; i++) st->print(" "); |
|
194b8e3a2fc4
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|
2573 st->print("%d<-%d %s", |
|
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|
2574 is_root() ? 0 : this->head()->pre_order(), |
|
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|
2575 is_root() ? 0 : this->tail()->pre_order(), |
|
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|
2576 is_irreducible()?" irr":""); |
|
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|
2577 st->print(" defs: "); |
|
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|
2578 def_locals()->print_on(st, _head->outer()->method()->max_locals()); |
|
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|
2579 st->cr(); |
|
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|
2580 for (Loop* ch = child(); ch != NULL; ch = ch->sibling()) |
|
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|
2581 ch->print(st, indent+2); |
|
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|
2582 } |
|
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|
2583 #endif |
|
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|
2584 |
|
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|
2585 // ------------------------------------------------------------------ |
|
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|
2586 // ciTypeFlow::df_flow_types |
|
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|
2587 // |
|
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|
2588 // Perform the depth first type flow analysis. Helper for flow_types. |
|
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|
2589 void ciTypeFlow::df_flow_types(Block* start, |
|
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|
2590 bool do_flow, |
|
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|
2591 StateVector* temp_vector, |
|
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|
2592 JsrSet* temp_set) { |
|
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|
2593 int dft_len = 100; |
| 1685 | 2594 GrowableArray<Block*> stk(dft_len); |
|
367
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|
2595 |
|
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|
2596 ciBlock* dummy = _methodBlocks->make_dummy_block(); |
|
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|
2597 JsrSet* root_set = new JsrSet(NULL, 0); |
|
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|
2598 Block* root_head = new (arena()) Block(this, dummy, root_set); |
|
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|
2599 Block* root_tail = new (arena()) Block(this, dummy, root_set); |
|
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|
2600 root_head->set_pre_order(0); |
|
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|
2601 root_head->set_post_order(0); |
|
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|
2602 root_tail->set_pre_order(max_jint); |
|
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|
2603 root_tail->set_post_order(max_jint); |
|
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|
2604 set_loop_tree_root(new (arena()) Loop(root_head, root_tail)); |
|
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|
2605 |
|
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|
2606 stk.push(start); |
|
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|
2607 |
|
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|
2608 _next_pre_order = 0; // initialize pre_order counter |
|
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|
2609 _rpo_list = NULL; |
|
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|
2610 int next_po = 0; // initialize post_order counter |
|
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|
2611 |
|
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|
2612 // Compute RPO and the control flow graph |
|
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|
2613 int size; |
|
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|
2614 while ((size = stk.length()) > 0) { |
|
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|
2615 Block* blk = stk.top(); // Leave node on stack |
|
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|
2616 if (!blk->is_visited()) { |
|
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|
2617 // forward arc in graph |
|
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|
2618 assert (!blk->has_pre_order(), ""); |
|
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|
2619 blk->set_next_pre_order(); |
|
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|
2620 |
|
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|
2621 if (_next_pre_order >= MaxNodeLimit / 2) { |
|
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|
2622 // Too many basic blocks. Bail out. |
|
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|
2623 // This can happen when try/finally constructs are nested to depth N, |
|
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|
2624 // and there is O(2**N) cloning of jsr bodies. See bug 4697245! |
|
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|
2625 // "MaxNodeLimit / 2" is used because probably the parser will |
|
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|
2626 // generate at least twice that many nodes and bail out. |
|
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|
2627 record_failure("too many basic blocks"); |
|
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|
2628 return; |
|
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|
2629 } |
|
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|
2630 if (do_flow) { |
|
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|
2631 flow_block(blk, temp_vector, temp_set); |
|
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|
2632 if (failing()) return; // Watch for bailouts. |
|
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|
2633 } |
|
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|
2634 } else if (!blk->is_post_visited()) { |
|
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|
2635 // cross or back arc |
|
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|
2636 for (SuccIter iter(blk); !iter.done(); iter.next()) { |
|
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|
2637 Block* succ = iter.succ(); |
|
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|
2638 if (!succ->is_visited()) { |
|
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|
2639 stk.push(succ); |
|
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|
2640 } |
|
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|
2641 } |
|
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|
2642 if (stk.length() == size) { |
|
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|
2643 // There were no additional children, post visit node now |
|
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|
2644 stk.pop(); // Remove node from stack |
|
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|
2645 |
|
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|
2646 build_loop_tree(blk); |
|
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|
2647 blk->set_post_order(next_po++); // Assign post order |
|
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|
2648 prepend_to_rpo_list(blk); |
|
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|
2649 assert(blk->is_post_visited(), ""); |
|
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|
2650 |
|
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|
2651 if (blk->is_loop_head() && !blk->is_on_work_list()) { |
|
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|
2652 // Assume loop heads need more data flow |
|
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|
2653 add_to_work_list(blk); |
|
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|
2654 } |
|
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|
2655 } |
|
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|
2656 } else { |
|
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|
2657 stk.pop(); // Remove post-visited node from stack |
|
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|
2658 } |
|
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|
2659 } |
|
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|
2660 } |
|
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|
2661 |
|
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|
2662 // ------------------------------------------------------------------ |
| 0 | 2663 // ciTypeFlow::flow_types |
| 2664 // | |
| 2665 // Perform the type flow analysis, creating and cloning Blocks as | |
| 2666 // necessary. | |
| 2667 void ciTypeFlow::flow_types() { | |
| 2668 ResourceMark rm; | |
| 2669 StateVector* temp_vector = new StateVector(this); | |
| 2670 JsrSet* temp_set = new JsrSet(NULL, 16); | |
| 2671 | |
| 2672 // Create the method entry block. | |
|
367
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|
2673 Block* start = block_at(start_bci(), temp_set); |
| 0 | 2674 |
| 2675 // Load the initial state into it. | |
| 2676 const StateVector* start_state = get_start_state(); | |
| 2677 if (failing()) return; | |
|
367
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|
2678 start->meet(start_state); |
|
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|
2679 |
|
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|
2680 // Depth first visit |
|
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|
2681 df_flow_types(start, true /*do flow*/, temp_vector, temp_set); |
| 0 | 2682 |
|
367
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|
2683 if (failing()) return; |
|
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|
2684 assert(_rpo_list == start, "must be start"); |
| 0 | 2685 |
|
367
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|
2686 // Any loops found? |
|
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|
2687 if (loop_tree_root()->child() != NULL && |
|
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|
2688 env()->comp_level() >= CompLevel_full_optimization) { |
|
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|
2689 // Loop optimizations are not performed on Tier1 compiles. |
|
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|
2690 |
|
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|
2691 bool changed = clone_loop_heads(loop_tree_root(), temp_vector, temp_set); |
| 0 | 2692 |
|
367
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|
2693 // If some loop heads were cloned, recompute postorder and loop tree |
|
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|
2694 if (changed) { |
|
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|
2695 loop_tree_root()->set_child(NULL); |
|
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0
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|
2696 for (Block* blk = _rpo_list; blk != NULL;) { |
|
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|
2697 Block* next = blk->rpo_next(); |
|
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|
2698 blk->df_init(); |
|
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|
2699 blk = next; |
|
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2700 } |
|
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2701 df_flow_types(start, false /*no flow*/, temp_vector, temp_set); |
|
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2702 } |
|
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2703 } |
| 0 | 2704 |
|
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2705 if (CITraceTypeFlow) { |
|
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2706 tty->print_cr("\nLoop tree"); |
|
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2707 loop_tree_root()->print(); |
|
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2708 } |
|
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2709 |
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2710 // Continue flow analysis until fixed point reached |
|
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2711 |
|
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2712 debug_only(int max_block = _next_pre_order;) |
| 0 | 2713 |
|
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2714 while (!work_list_empty()) { |
|
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2715 Block* blk = work_list_next(); |
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2716 assert (blk->has_post_order(), "post order assigned above"); |
|
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2717 |
|
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2718 flow_block(blk, temp_vector, temp_set); |
|
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2719 |
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2720 assert (max_block == _next_pre_order, "no new blocks"); |
|
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2721 assert (!failing(), "no more bailouts"); |
| 0 | 2722 } |
| 2723 } | |
| 2724 | |
| 2725 // ------------------------------------------------------------------ | |
| 2726 // ciTypeFlow::map_blocks | |
| 2727 // | |
|
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2728 // Create the block map, which indexes blocks in reverse post-order. |
| 0 | 2729 void ciTypeFlow::map_blocks() { |
| 2730 assert(_block_map == NULL, "single initialization"); | |
|
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2731 int block_ct = _next_pre_order; |
|
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2732 _block_map = NEW_ARENA_ARRAY(arena(), Block*, block_ct); |
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2733 assert(block_ct == block_count(), ""); |
|
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2734 |
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2735 Block* blk = _rpo_list; |
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2736 for (int m = 0; m < block_ct; m++) { |
|
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2737 int rpo = blk->rpo(); |
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2738 assert(rpo == m, "should be sequential"); |
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2739 _block_map[rpo] = blk; |
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2740 blk = blk->rpo_next(); |
| 0 | 2741 } |
|
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2742 assert(blk == NULL, "should be done"); |
|
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2743 |
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2744 for (int j = 0; j < block_ct; j++) { |
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2745 assert(_block_map[j] != NULL, "must not drop any blocks"); |
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2746 Block* block = _block_map[j]; |
| 0 | 2747 // Remove dead blocks from successor lists: |
| 2748 for (int e = 0; e <= 1; e++) { | |
| 2749 GrowableArray<Block*>* l = e? block->exceptions(): block->successors(); | |
|
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2750 for (int k = 0; k < l->length(); k++) { |
|
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2751 Block* s = l->at(k); |
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2752 if (!s->has_post_order()) { |
| 0 | 2753 if (CITraceTypeFlow) { |
| 2754 tty->print("Removing dead %s successor of #%d: ", (e? "exceptional": "normal"), block->pre_order()); | |
| 2755 s->print_value_on(tty); | |
| 2756 tty->cr(); | |
| 2757 } | |
| 2758 l->remove(s); | |
|
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2759 --k; |
| 0 | 2760 } |
| 2761 } | |
| 2762 } | |
| 2763 } | |
| 2764 } | |
| 2765 | |
| 2766 // ------------------------------------------------------------------ | |
| 2767 // ciTypeFlow::get_block_for | |
| 2768 // | |
| 2769 // Find a block with this ciBlock which has a compatible JsrSet. | |
| 2770 // If no such block exists, create it, unless the option is no_create. | |
|
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2771 // If the option is create_backedge_copy, always create a fresh backedge copy. |
| 0 | 2772 ciTypeFlow::Block* ciTypeFlow::get_block_for(int ciBlockIndex, ciTypeFlow::JsrSet* jsrs, CreateOption option) { |
| 2773 Arena* a = arena(); | |
| 2774 GrowableArray<Block*>* blocks = _idx_to_blocklist[ciBlockIndex]; | |
| 2775 if (blocks == NULL) { | |
| 2776 // Query only? | |
| 2777 if (option == no_create) return NULL; | |
| 2778 | |
| 2779 // Allocate the growable array. | |
| 2780 blocks = new (a) GrowableArray<Block*>(a, 4, 0, NULL); | |
| 2781 _idx_to_blocklist[ciBlockIndex] = blocks; | |
| 2782 } | |
| 2783 | |
|
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2784 if (option != create_backedge_copy) { |
| 0 | 2785 int len = blocks->length(); |
| 2786 for (int i = 0; i < len; i++) { | |
| 2787 Block* block = blocks->at(i); | |
|
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2788 if (!block->is_backedge_copy() && block->is_compatible_with(jsrs)) { |
| 0 | 2789 return block; |
| 2790 } | |
| 2791 } | |
| 2792 } | |
| 2793 | |
| 2794 // Query only? | |
| 2795 if (option == no_create) return NULL; | |
| 2796 | |
| 2797 // We did not find a compatible block. Create one. | |
| 2798 Block* new_block = new (a) Block(this, _methodBlocks->block(ciBlockIndex), jsrs); | |
|
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|
2799 if (option == create_backedge_copy) new_block->set_backedge_copy(true); |
| 0 | 2800 blocks->append(new_block); |
| 2801 return new_block; | |
| 2802 } | |
| 2803 | |
| 2804 // ------------------------------------------------------------------ | |
|
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|
2805 // ciTypeFlow::backedge_copy_count |
| 0 | 2806 // |
|
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2807 int ciTypeFlow::backedge_copy_count(int ciBlockIndex, ciTypeFlow::JsrSet* jsrs) const { |
| 0 | 2808 GrowableArray<Block*>* blocks = _idx_to_blocklist[ciBlockIndex]; |
| 2809 | |
| 2810 if (blocks == NULL) { | |
| 2811 return 0; | |
| 2812 } | |
| 2813 | |
| 2814 int count = 0; | |
| 2815 int len = blocks->length(); | |
| 2816 for (int i = 0; i < len; i++) { | |
| 2817 Block* block = blocks->at(i); | |
|
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|
2818 if (block->is_backedge_copy() && block->is_compatible_with(jsrs)) { |
| 0 | 2819 count++; |
| 2820 } | |
| 2821 } | |
| 2822 | |
| 2823 return count; | |
| 2824 } | |
| 2825 | |
| 2826 // ------------------------------------------------------------------ | |
| 2827 // ciTypeFlow::do_flow | |
| 2828 // | |
| 2829 // Perform type inference flow analysis. | |
| 2830 void ciTypeFlow::do_flow() { | |
| 2831 if (CITraceTypeFlow) { | |
| 2832 tty->print_cr("\nPerforming flow analysis on method"); | |
| 2833 method()->print(); | |
| 2834 if (is_osr_flow()) tty->print(" at OSR bci %d", start_bci()); | |
| 2835 tty->cr(); | |
| 2836 method()->print_codes(); | |
| 2837 } | |
| 2838 if (CITraceTypeFlow) { | |
| 2839 tty->print_cr("Initial CI Blocks"); | |
| 2840 print_on(tty); | |
| 2841 } | |
| 2842 flow_types(); | |
| 2843 // Watch for bailouts. | |
| 2844 if (failing()) { | |
| 2845 return; | |
| 2846 } | |
|
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|
2847 |
|
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|
2848 map_blocks(); |
|
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2849 |
| 0 | 2850 if (CIPrintTypeFlow || CITraceTypeFlow) { |
|
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|
2851 rpo_print_on(tty); |
| 0 | 2852 } |
| 2853 } | |
| 2854 | |
| 2855 // ------------------------------------------------------------------ | |
| 2856 // ciTypeFlow::record_failure() | |
| 2857 // The ciTypeFlow object keeps track of failure reasons separately from the ciEnv. | |
| 2858 // This is required because there is not a 1-1 relation between the ciEnv and | |
| 2859 // the TypeFlow passes within a compilation task. For example, if the compiler | |
| 2860 // is considering inlining a method, it will request a TypeFlow. If that fails, | |
| 2861 // the compilation as a whole may continue without the inlining. Some TypeFlow | |
| 2862 // requests are not optional; if they fail the requestor is responsible for | |
| 2863 // copying the failure reason up to the ciEnv. (See Parse::Parse.) | |
| 2864 void ciTypeFlow::record_failure(const char* reason) { | |
| 2865 if (env()->log() != NULL) { | |
| 2866 env()->log()->elem("failure reason='%s' phase='typeflow'", reason); | |
| 2867 } | |
| 2868 if (_failure_reason == NULL) { | |
| 2869 // Record the first failure reason. | |
| 2870 _failure_reason = reason; | |
| 2871 } | |
| 2872 } | |
| 2873 | |
| 2874 #ifndef PRODUCT | |
| 2875 // ------------------------------------------------------------------ | |
| 2876 // ciTypeFlow::print_on | |
| 2877 void ciTypeFlow::print_on(outputStream* st) const { | |
| 2878 // Walk through CI blocks | |
| 2879 st->print_cr("********************************************************"); | |
| 2880 st->print ("TypeFlow for "); | |
| 2881 method()->name()->print_symbol_on(st); | |
| 2882 int limit_bci = code_size(); | |
| 2883 st->print_cr(" %d bytes", limit_bci); | |
| 2884 ciMethodBlocks *mblks = _methodBlocks; | |
| 2885 ciBlock* current = NULL; | |
| 2886 for (int bci = 0; bci < limit_bci; bci++) { | |
| 2887 ciBlock* blk = mblks->block_containing(bci); | |
| 2888 if (blk != NULL && blk != current) { | |
| 2889 current = blk; | |
| 2890 current->print_on(st); | |
| 2891 | |
| 2892 GrowableArray<Block*>* blocks = _idx_to_blocklist[blk->index()]; | |
| 2893 int num_blocks = (blocks == NULL) ? 0 : blocks->length(); | |
| 2894 | |
| 2895 if (num_blocks == 0) { | |
| 2896 st->print_cr(" No Blocks"); | |
| 2897 } else { | |
| 2898 for (int i = 0; i < num_blocks; i++) { | |
| 2899 Block* block = blocks->at(i); | |
| 2900 block->print_on(st); | |
| 2901 } | |
| 2902 } | |
| 2903 st->print_cr("--------------------------------------------------------"); | |
| 2904 st->cr(); | |
| 2905 } | |
| 2906 } | |
| 2907 st->print_cr("********************************************************"); | |
| 2908 st->cr(); | |
| 2909 } | |
|
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2910 |
|
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|
2911 void ciTypeFlow::rpo_print_on(outputStream* st) const { |
|
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|
2912 st->print_cr("********************************************************"); |
|
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2913 st->print ("TypeFlow for "); |
|
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|
2914 method()->name()->print_symbol_on(st); |
|
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2915 int limit_bci = code_size(); |
|
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|
2916 st->print_cr(" %d bytes", limit_bci); |
|
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2917 for (Block* blk = _rpo_list; blk != NULL; blk = blk->rpo_next()) { |
|
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|
2918 blk->print_on(st); |
|
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|
2919 st->print_cr("--------------------------------------------------------"); |
|
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|
2920 st->cr(); |
|
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|
2921 } |
|
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|
2922 st->print_cr("********************************************************"); |
|
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|
2923 st->cr(); |
|
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|
2924 } |
| 0 | 2925 #endif |