Mercurial > hg > truffle
annotate src/share/vm/ci/ciTypeFlow.cpp @ 2142:8012aa3ccede
4926272: methodOopDesc::method_from_bcp is unsafe
Reviewed-by: coleenp, jrose, kvn, dcubed
| author | never |
|---|---|
| date | Thu, 13 Jan 2011 22:15:41 -0800 |
| parents | f95d63e2154a |
| children | 322a41ec766c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2142 | 2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "ci/ciConstant.hpp" | |
| 27 #include "ci/ciField.hpp" | |
| 28 #include "ci/ciMethod.hpp" | |
| 29 #include "ci/ciMethodData.hpp" | |
| 30 #include "ci/ciObjArrayKlass.hpp" | |
| 31 #include "ci/ciStreams.hpp" | |
| 32 #include "ci/ciTypeArrayKlass.hpp" | |
| 33 #include "ci/ciTypeFlow.hpp" | |
| 34 #include "compiler/compileLog.hpp" | |
| 35 #include "interpreter/bytecode.hpp" | |
| 36 #include "interpreter/bytecodes.hpp" | |
| 37 #include "memory/allocation.inline.hpp" | |
| 38 #include "runtime/deoptimization.hpp" | |
| 39 #include "utilities/growableArray.hpp" | |
| 0 | 40 |
| 41 // ciTypeFlow::JsrSet | |
| 42 // | |
| 43 // A JsrSet represents some set of JsrRecords. This class | |
| 44 // is used to record a set of all jsr routines which we permit | |
| 45 // execution to return (ret) from. | |
| 46 // | |
| 47 // During abstract interpretation, JsrSets are used to determine | |
| 48 // whether two paths which reach a given block are unique, and | |
| 49 // should be cloned apart, or are compatible, and should merge | |
| 50 // together. | |
| 51 | |
| 52 // ------------------------------------------------------------------ | |
| 53 // ciTypeFlow::JsrSet::JsrSet | |
| 54 ciTypeFlow::JsrSet::JsrSet(Arena* arena, int default_len) { | |
| 55 if (arena != NULL) { | |
| 56 // Allocate growable array in Arena. | |
| 57 _set = new (arena) GrowableArray<JsrRecord*>(arena, default_len, 0, NULL); | |
| 58 } else { | |
| 59 // Allocate growable array in current ResourceArea. | |
| 60 _set = new GrowableArray<JsrRecord*>(4, 0, NULL, false); | |
| 61 } | |
| 62 } | |
| 63 | |
| 64 // ------------------------------------------------------------------ | |
| 65 // ciTypeFlow::JsrSet::copy_into | |
| 66 void ciTypeFlow::JsrSet::copy_into(JsrSet* jsrs) { | |
| 67 int len = size(); | |
| 68 jsrs->_set->clear(); | |
| 69 for (int i = 0; i < len; i++) { | |
| 70 jsrs->_set->append(_set->at(i)); | |
| 71 } | |
| 72 } | |
| 73 | |
| 74 // ------------------------------------------------------------------ | |
| 75 // ciTypeFlow::JsrSet::is_compatible_with | |
| 76 // | |
| 77 // !!!! MISGIVINGS ABOUT THIS... disregard | |
| 78 // | |
| 79 // Is this JsrSet compatible with some other JsrSet? | |
| 80 // | |
| 81 // In set-theoretic terms, a JsrSet can be viewed as a partial function | |
| 82 // from entry addresses to return addresses. Two JsrSets A and B are | |
| 83 // compatible iff | |
| 84 // | |
| 85 // For any x, | |
| 86 // A(x) defined and B(x) defined implies A(x) == B(x) | |
| 87 // | |
| 88 // Less formally, two JsrSets are compatible when they have identical | |
| 89 // return addresses for any entry addresses they share in common. | |
| 90 bool ciTypeFlow::JsrSet::is_compatible_with(JsrSet* other) { | |
| 91 // Walk through both sets in parallel. If the same entry address | |
| 92 // appears in both sets, then the return address must match for | |
| 93 // the sets to be compatible. | |
| 94 int size1 = size(); | |
| 95 int size2 = other->size(); | |
| 96 | |
| 97 // Special case. If nothing is on the jsr stack, then there can | |
| 98 // be no ret. | |
| 99 if (size2 == 0) { | |
| 100 return true; | |
| 101 } else if (size1 != size2) { | |
| 102 return false; | |
| 103 } else { | |
| 104 for (int i = 0; i < size1; i++) { | |
| 105 JsrRecord* record1 = record_at(i); | |
| 106 JsrRecord* record2 = other->record_at(i); | |
| 107 if (record1->entry_address() != record2->entry_address() || | |
| 108 record1->return_address() != record2->return_address()) { | |
| 109 return false; | |
| 110 } | |
| 111 } | |
| 112 return true; | |
| 113 } | |
| 114 | |
| 115 #if 0 | |
| 116 int pos1 = 0; | |
| 117 int pos2 = 0; | |
| 118 int size1 = size(); | |
| 119 int size2 = other->size(); | |
| 120 while (pos1 < size1 && pos2 < size2) { | |
| 121 JsrRecord* record1 = record_at(pos1); | |
| 122 JsrRecord* record2 = other->record_at(pos2); | |
| 123 int entry1 = record1->entry_address(); | |
| 124 int entry2 = record2->entry_address(); | |
| 125 if (entry1 < entry2) { | |
| 126 pos1++; | |
| 127 } else if (entry1 > entry2) { | |
| 128 pos2++; | |
| 129 } else { | |
| 130 if (record1->return_address() == record2->return_address()) { | |
| 131 pos1++; | |
| 132 pos2++; | |
| 133 } else { | |
| 134 // These two JsrSets are incompatible. | |
| 135 return false; | |
| 136 } | |
| 137 } | |
| 138 } | |
| 139 // The two JsrSets agree. | |
| 140 return true; | |
| 141 #endif | |
| 142 } | |
| 143 | |
| 144 // ------------------------------------------------------------------ | |
| 145 // ciTypeFlow::JsrSet::insert_jsr_record | |
| 146 // | |
| 147 // Insert the given JsrRecord into the JsrSet, maintaining the order | |
| 148 // of the set and replacing any element with the same entry address. | |
| 149 void ciTypeFlow::JsrSet::insert_jsr_record(JsrRecord* record) { | |
| 150 int len = size(); | |
| 151 int entry = record->entry_address(); | |
| 152 int pos = 0; | |
| 153 for ( ; pos < len; pos++) { | |
| 154 JsrRecord* current = record_at(pos); | |
| 155 if (entry == current->entry_address()) { | |
| 156 // Stomp over this entry. | |
| 157 _set->at_put(pos, record); | |
| 158 assert(size() == len, "must be same size"); | |
| 159 return; | |
| 160 } else if (entry < current->entry_address()) { | |
| 161 break; | |
| 162 } | |
| 163 } | |
| 164 | |
| 165 // Insert the record into the list. | |
| 166 JsrRecord* swap = record; | |
| 167 JsrRecord* temp = NULL; | |
| 168 for ( ; pos < len; pos++) { | |
| 169 temp = _set->at(pos); | |
| 170 _set->at_put(pos, swap); | |
| 171 swap = temp; | |
| 172 } | |
| 173 _set->append(swap); | |
| 174 assert(size() == len+1, "must be larger"); | |
| 175 } | |
| 176 | |
| 177 // ------------------------------------------------------------------ | |
| 178 // ciTypeFlow::JsrSet::remove_jsr_record | |
| 179 // | |
| 180 // Remove the JsrRecord with the given return address from the JsrSet. | |
| 181 void ciTypeFlow::JsrSet::remove_jsr_record(int return_address) { | |
| 182 int len = size(); | |
| 183 for (int i = 0; i < len; i++) { | |
| 184 if (record_at(i)->return_address() == return_address) { | |
| 185 // We have found the proper entry. Remove it from the | |
| 186 // JsrSet and exit. | |
| 187 for (int j = i+1; j < len ; j++) { | |
| 188 _set->at_put(j-1, _set->at(j)); | |
| 189 } | |
| 190 _set->trunc_to(len-1); | |
| 191 assert(size() == len-1, "must be smaller"); | |
| 192 return; | |
| 193 } | |
| 194 } | |
| 195 assert(false, "verify: returning from invalid subroutine"); | |
| 196 } | |
| 197 | |
| 198 // ------------------------------------------------------------------ | |
| 199 // ciTypeFlow::JsrSet::apply_control | |
| 200 // | |
| 201 // Apply the effect of a control-flow bytecode on the JsrSet. The | |
| 202 // only bytecodes that modify the JsrSet are jsr and ret. | |
| 203 void ciTypeFlow::JsrSet::apply_control(ciTypeFlow* analyzer, | |
| 204 ciBytecodeStream* str, | |
| 205 ciTypeFlow::StateVector* state) { | |
| 206 Bytecodes::Code code = str->cur_bc(); | |
| 207 if (code == Bytecodes::_jsr) { | |
| 208 JsrRecord* record = | |
| 209 analyzer->make_jsr_record(str->get_dest(), str->next_bci()); | |
| 210 insert_jsr_record(record); | |
| 211 } else if (code == Bytecodes::_jsr_w) { | |
| 212 JsrRecord* record = | |
| 213 analyzer->make_jsr_record(str->get_far_dest(), str->next_bci()); | |
| 214 insert_jsr_record(record); | |
| 215 } else if (code == Bytecodes::_ret) { | |
| 216 Cell local = state->local(str->get_index()); | |
| 217 ciType* return_address = state->type_at(local); | |
| 218 assert(return_address->is_return_address(), "verify: wrong type"); | |
| 219 if (size() == 0) { | |
| 220 // Ret-state underflow: Hit a ret w/o any previous jsrs. Bail out. | |
| 221 // This can happen when a loop is inside a finally clause (4614060). | |
| 222 analyzer->record_failure("OSR in finally clause"); | |
| 223 return; | |
| 224 } | |
| 225 remove_jsr_record(return_address->as_return_address()->bci()); | |
| 226 } | |
| 227 } | |
| 228 | |
| 229 #ifndef PRODUCT | |
| 230 // ------------------------------------------------------------------ | |
| 231 // ciTypeFlow::JsrSet::print_on | |
| 232 void ciTypeFlow::JsrSet::print_on(outputStream* st) const { | |
| 233 st->print("{ "); | |
| 234 int num_elements = size(); | |
| 235 if (num_elements > 0) { | |
| 236 int i = 0; | |
| 237 for( ; i < num_elements - 1; i++) { | |
| 238 _set->at(i)->print_on(st); | |
| 239 st->print(", "); | |
| 240 } | |
| 241 _set->at(i)->print_on(st); | |
| 242 st->print(" "); | |
| 243 } | |
| 244 st->print("}"); | |
| 245 } | |
| 246 #endif | |
| 247 | |
| 248 // ciTypeFlow::StateVector | |
| 249 // | |
| 250 // A StateVector summarizes the type information at some point in | |
| 251 // the program. | |
| 252 | |
| 253 // ------------------------------------------------------------------ | |
| 254 // ciTypeFlow::StateVector::type_meet | |
| 255 // | |
| 256 // Meet two types. | |
| 257 // | |
| 258 // The semi-lattice of types use by this analysis are modeled on those | |
| 259 // of the verifier. The lattice is as follows: | |
| 260 // | |
| 261 // top_type() >= all non-extremal types >= bottom_type | |
| 262 // and | |
| 263 // Every primitive type is comparable only with itself. The meet of | |
| 264 // reference types is determined by their kind: instance class, | |
| 265 // interface, or array class. The meet of two types of the same | |
| 266 // kind is their least common ancestor. The meet of two types of | |
| 267 // different kinds is always java.lang.Object. | |
| 268 ciType* ciTypeFlow::StateVector::type_meet_internal(ciType* t1, ciType* t2, ciTypeFlow* analyzer) { | |
| 269 assert(t1 != t2, "checked in caller"); | |
| 270 if (t1->equals(top_type())) { | |
| 271 return t2; | |
| 272 } else if (t2->equals(top_type())) { | |
| 273 return t1; | |
| 274 } else if (t1->is_primitive_type() || t2->is_primitive_type()) { | |
| 275 // Special case null_type. null_type meet any reference type T | |
| 276 // is T. null_type meet null_type is null_type. | |
| 277 if (t1->equals(null_type())) { | |
| 278 if (!t2->is_primitive_type() || t2->equals(null_type())) { | |
| 279 return t2; | |
| 280 } | |
| 281 } else if (t2->equals(null_type())) { | |
| 282 if (!t1->is_primitive_type()) { | |
| 283 return t1; | |
| 284 } | |
| 285 } | |
| 286 | |
| 287 // At least one of the two types is a non-top primitive type. | |
| 288 // The other type is not equal to it. Fall to bottom. | |
| 289 return bottom_type(); | |
| 290 } else { | |
| 291 // Both types are non-top non-primitive types. That is, | |
| 292 // both types are either instanceKlasses or arrayKlasses. | |
| 293 ciKlass* object_klass = analyzer->env()->Object_klass(); | |
| 294 ciKlass* k1 = t1->as_klass(); | |
| 295 ciKlass* k2 = t2->as_klass(); | |
| 296 if (k1->equals(object_klass) || k2->equals(object_klass)) { | |
| 297 return object_klass; | |
| 298 } else if (!k1->is_loaded() || !k2->is_loaded()) { | |
| 299 // Unloaded classes fall to java.lang.Object at a merge. | |
| 300 return object_klass; | |
| 301 } else if (k1->is_interface() != k2->is_interface()) { | |
| 302 // When an interface meets a non-interface, we get Object; | |
| 303 // This is what the verifier does. | |
| 304 return object_klass; | |
| 305 } else if (k1->is_array_klass() || k2->is_array_klass()) { | |
| 306 // When an array meets a non-array, we get Object. | |
| 307 // When objArray meets typeArray, we also get Object. | |
| 308 // And when typeArray meets different typeArray, we again get Object. | |
| 309 // But when objArray meets objArray, we look carefully at element types. | |
| 310 if (k1->is_obj_array_klass() && k2->is_obj_array_klass()) { | |
| 311 // Meet the element types, then construct the corresponding array type. | |
| 312 ciKlass* elem1 = k1->as_obj_array_klass()->element_klass(); | |
| 313 ciKlass* elem2 = k2->as_obj_array_klass()->element_klass(); | |
| 314 ciKlass* elem = type_meet_internal(elem1, elem2, analyzer)->as_klass(); | |
| 315 // Do an easy shortcut if one type is a super of the other. | |
| 316 if (elem == elem1) { | |
| 317 assert(k1 == ciObjArrayKlass::make(elem), "shortcut is OK"); | |
| 318 return k1; | |
| 319 } else if (elem == elem2) { | |
| 320 assert(k2 == ciObjArrayKlass::make(elem), "shortcut is OK"); | |
| 321 return k2; | |
| 322 } else { | |
| 323 return ciObjArrayKlass::make(elem); | |
| 324 } | |
| 325 } else { | |
| 326 return object_klass; | |
| 327 } | |
| 328 } else { | |
| 329 // Must be two plain old instance klasses. | |
| 330 assert(k1->is_instance_klass(), "previous cases handle non-instances"); | |
| 331 assert(k2->is_instance_klass(), "previous cases handle non-instances"); | |
| 332 return k1->least_common_ancestor(k2); | |
| 333 } | |
| 334 } | |
| 335 } | |
| 336 | |
| 337 | |
| 338 // ------------------------------------------------------------------ | |
| 339 // ciTypeFlow::StateVector::StateVector | |
| 340 // | |
| 341 // Build a new state vector | |
| 342 ciTypeFlow::StateVector::StateVector(ciTypeFlow* analyzer) { | |
| 343 _outer = analyzer; | |
| 344 _stack_size = -1; | |
| 345 _monitor_count = -1; | |
| 346 // Allocate the _types array | |
| 347 int max_cells = analyzer->max_cells(); | |
| 348 _types = (ciType**)analyzer->arena()->Amalloc(sizeof(ciType*) * max_cells); | |
| 349 for (int i=0; i<max_cells; i++) { | |
| 350 _types[i] = top_type(); | |
| 351 } | |
| 352 _trap_bci = -1; | |
| 353 _trap_index = 0; | |
|
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354 _def_locals.clear(); |
| 0 | 355 } |
| 356 | |
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357 |
| 0 | 358 // ------------------------------------------------------------------ |
| 359 // ciTypeFlow::get_start_state | |
| 360 // | |
| 361 // Set this vector to the method entry state. | |
| 362 const ciTypeFlow::StateVector* ciTypeFlow::get_start_state() { | |
| 363 StateVector* state = new StateVector(this); | |
| 364 if (is_osr_flow()) { | |
| 365 ciTypeFlow* non_osr_flow = method()->get_flow_analysis(); | |
| 366 if (non_osr_flow->failing()) { | |
| 367 record_failure(non_osr_flow->failure_reason()); | |
| 368 return NULL; | |
| 369 } | |
| 370 JsrSet* jsrs = new JsrSet(NULL, 16); | |
| 371 Block* non_osr_block = non_osr_flow->existing_block_at(start_bci(), jsrs); | |
| 372 if (non_osr_block == NULL) { | |
| 373 record_failure("cannot reach OSR point"); | |
| 374 return NULL; | |
| 375 } | |
| 376 // load up the non-OSR state at this point | |
| 377 non_osr_block->copy_state_into(state); | |
| 378 int non_osr_start = non_osr_block->start(); | |
| 379 if (non_osr_start != start_bci()) { | |
| 380 // must flow forward from it | |
| 381 if (CITraceTypeFlow) { | |
| 382 tty->print_cr(">> Interpreting pre-OSR block %d:", non_osr_start); | |
| 383 } | |
| 384 Block* block = block_at(non_osr_start, jsrs); | |
| 385 assert(block->limit() == start_bci(), "must flow forward to start"); | |
| 386 flow_block(block, state, jsrs); | |
| 387 } | |
| 388 return state; | |
| 389 // Note: The code below would be an incorrect for an OSR flow, | |
| 390 // even if it were possible for an OSR entry point to be at bci zero. | |
| 391 } | |
| 392 // "Push" the method signature into the first few locals. | |
| 393 state->set_stack_size(-max_locals()); | |
| 394 if (!method()->is_static()) { | |
| 395 state->push(method()->holder()); | |
| 396 assert(state->tos() == state->local(0), ""); | |
| 397 } | |
| 398 for (ciSignatureStream str(method()->signature()); | |
| 399 !str.at_return_type(); | |
| 400 str.next()) { | |
| 401 state->push_translate(str.type()); | |
| 402 } | |
| 403 // Set the rest of the locals to bottom. | |
| 404 Cell cell = state->next_cell(state->tos()); | |
| 405 state->set_stack_size(0); | |
| 406 int limit = state->limit_cell(); | |
| 407 for (; cell < limit; cell = state->next_cell(cell)) { | |
| 408 state->set_type_at(cell, state->bottom_type()); | |
| 409 } | |
| 410 // Lock an object, if necessary. | |
| 411 state->set_monitor_count(method()->is_synchronized() ? 1 : 0); | |
| 412 return state; | |
| 413 } | |
| 414 | |
| 415 // ------------------------------------------------------------------ | |
| 416 // ciTypeFlow::StateVector::copy_into | |
| 417 // | |
| 418 // Copy our value into some other StateVector | |
| 419 void ciTypeFlow::StateVector::copy_into(ciTypeFlow::StateVector* copy) | |
| 420 const { | |
| 421 copy->set_stack_size(stack_size()); | |
| 422 copy->set_monitor_count(monitor_count()); | |
| 423 Cell limit = limit_cell(); | |
| 424 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
| 425 copy->set_type_at(c, type_at(c)); | |
| 426 } | |
| 427 } | |
| 428 | |
| 429 // ------------------------------------------------------------------ | |
| 430 // ciTypeFlow::StateVector::meet | |
| 431 // | |
| 432 // Meets this StateVector with another, destructively modifying this | |
| 433 // one. Returns true if any modification takes place. | |
| 434 bool ciTypeFlow::StateVector::meet(const ciTypeFlow::StateVector* incoming) { | |
| 435 if (monitor_count() == -1) { | |
| 436 set_monitor_count(incoming->monitor_count()); | |
| 437 } | |
| 438 assert(monitor_count() == incoming->monitor_count(), "monitors must match"); | |
| 439 | |
| 440 if (stack_size() == -1) { | |
| 441 set_stack_size(incoming->stack_size()); | |
| 442 Cell limit = limit_cell(); | |
| 443 #ifdef ASSERT | |
| 444 { for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
| 445 assert(type_at(c) == top_type(), ""); | |
| 446 } } | |
| 447 #endif | |
| 448 // Make a simple copy of the incoming state. | |
| 449 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
| 450 set_type_at(c, incoming->type_at(c)); | |
| 451 } | |
| 452 return true; // it is always different the first time | |
| 453 } | |
| 454 #ifdef ASSERT | |
| 455 if (stack_size() != incoming->stack_size()) { | |
| 456 _outer->method()->print_codes(); | |
| 457 tty->print_cr("!!!! Stack size conflict"); | |
| 458 tty->print_cr("Current state:"); | |
| 459 print_on(tty); | |
| 460 tty->print_cr("Incoming state:"); | |
| 461 ((StateVector*)incoming)->print_on(tty); | |
| 462 } | |
| 463 #endif | |
| 464 assert(stack_size() == incoming->stack_size(), "sanity"); | |
| 465 | |
| 466 bool different = false; | |
| 467 Cell limit = limit_cell(); | |
| 468 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { | |
| 469 ciType* t1 = type_at(c); | |
| 470 ciType* t2 = incoming->type_at(c); | |
| 471 if (!t1->equals(t2)) { | |
| 472 ciType* new_type = type_meet(t1, t2); | |
| 473 if (!t1->equals(new_type)) { | |
| 474 set_type_at(c, new_type); | |
| 475 different = true; | |
| 476 } | |
| 477 } | |
| 478 } | |
| 479 return different; | |
| 480 } | |
| 481 | |
| 482 // ------------------------------------------------------------------ | |
| 483 // ciTypeFlow::StateVector::meet_exception | |
| 484 // | |
| 485 // Meets this StateVector with another, destructively modifying this | |
| 486 // one. The incoming state is coming via an exception. Returns true | |
| 487 // if any modification takes place. | |
| 488 bool ciTypeFlow::StateVector::meet_exception(ciInstanceKlass* exc, | |
| 489 const ciTypeFlow::StateVector* incoming) { | |
| 490 if (monitor_count() == -1) { | |
| 491 set_monitor_count(incoming->monitor_count()); | |
| 492 } | |
| 493 assert(monitor_count() == incoming->monitor_count(), "monitors must match"); | |
| 494 | |
| 495 if (stack_size() == -1) { | |
| 496 set_stack_size(1); | |
| 497 } | |
| 498 | |
| 499 assert(stack_size() == 1, "must have one-element stack"); | |
| 500 | |
| 501 bool different = false; | |
| 502 | |
| 503 // Meet locals from incoming array. | |
| 504 Cell limit = local(_outer->max_locals()-1); | |
| 505 for (Cell c = start_cell(); c <= limit; c = next_cell(c)) { | |
| 506 ciType* t1 = type_at(c); | |
| 507 ciType* t2 = incoming->type_at(c); | |
| 508 if (!t1->equals(t2)) { | |
| 509 ciType* new_type = type_meet(t1, t2); | |
| 510 if (!t1->equals(new_type)) { | |
| 511 set_type_at(c, new_type); | |
| 512 different = true; | |
| 513 } | |
| 514 } | |
| 515 } | |
| 516 | |
| 517 // Handle stack separately. When an exception occurs, the | |
| 518 // only stack entry is the exception instance. | |
| 519 ciType* tos_type = type_at_tos(); | |
| 520 if (!tos_type->equals(exc)) { | |
| 521 ciType* new_type = type_meet(tos_type, exc); | |
| 522 if (!tos_type->equals(new_type)) { | |
| 523 set_type_at_tos(new_type); | |
| 524 different = true; | |
| 525 } | |
| 526 } | |
| 527 | |
| 528 return different; | |
| 529 } | |
| 530 | |
| 531 // ------------------------------------------------------------------ | |
| 532 // ciTypeFlow::StateVector::push_translate | |
| 533 void ciTypeFlow::StateVector::push_translate(ciType* type) { | |
| 534 BasicType basic_type = type->basic_type(); | |
| 535 if (basic_type == T_BOOLEAN || basic_type == T_CHAR || | |
| 536 basic_type == T_BYTE || basic_type == T_SHORT) { | |
| 537 push_int(); | |
| 538 } else { | |
| 539 push(type); | |
| 540 if (type->is_two_word()) { | |
| 541 push(half_type(type)); | |
| 542 } | |
| 543 } | |
| 544 } | |
| 545 | |
| 546 // ------------------------------------------------------------------ | |
| 547 // ciTypeFlow::StateVector::do_aaload | |
| 548 void ciTypeFlow::StateVector::do_aaload(ciBytecodeStream* str) { | |
| 549 pop_int(); | |
| 550 ciObjArrayKlass* array_klass = pop_objArray(); | |
| 551 if (array_klass == NULL) { | |
| 552 // Did aaload on a null reference; push a null and ignore the exception. | |
| 553 // This instruction will never continue normally. All we have to do | |
| 554 // is report a value that will meet correctly with any downstream | |
| 555 // reference types on paths that will truly be executed. This null type | |
| 556 // meets with any reference type to yield that same reference type. | |
| 605 | 557 // (The compiler will generate an unconditional exception here.) |
| 0 | 558 push(null_type()); |
| 559 return; | |
| 560 } | |
| 561 if (!array_klass->is_loaded()) { | |
| 562 // Only fails for some -Xcomp runs | |
| 563 trap(str, array_klass, | |
| 564 Deoptimization::make_trap_request | |
| 565 (Deoptimization::Reason_unloaded, | |
| 566 Deoptimization::Action_reinterpret)); | |
| 567 return; | |
| 568 } | |
| 569 ciKlass* element_klass = array_klass->element_klass(); | |
| 570 if (!element_klass->is_loaded() && element_klass->is_instance_klass()) { | |
| 571 Untested("unloaded array element class in ciTypeFlow"); | |
| 572 trap(str, element_klass, | |
| 573 Deoptimization::make_trap_request | |
| 574 (Deoptimization::Reason_unloaded, | |
| 575 Deoptimization::Action_reinterpret)); | |
| 576 } else { | |
| 577 push_object(element_klass); | |
| 578 } | |
| 579 } | |
| 580 | |
| 581 | |
| 582 // ------------------------------------------------------------------ | |
| 583 // ciTypeFlow::StateVector::do_checkcast | |
| 584 void ciTypeFlow::StateVector::do_checkcast(ciBytecodeStream* str) { | |
| 585 bool will_link; | |
| 586 ciKlass* klass = str->get_klass(will_link); | |
| 587 if (!will_link) { | |
| 588 // VM's interpreter will not load 'klass' if object is NULL. | |
| 589 // Type flow after this block may still be needed in two situations: | |
| 590 // 1) C2 uses do_null_assert() and continues compilation for later blocks | |
| 591 // 2) C2 does an OSR compile in a later block (see bug 4778368). | |
| 592 pop_object(); | |
| 593 do_null_assert(klass); | |
| 594 } else { | |
| 595 pop_object(); | |
| 596 push_object(klass); | |
| 597 } | |
| 598 } | |
| 599 | |
| 600 // ------------------------------------------------------------------ | |
| 601 // ciTypeFlow::StateVector::do_getfield | |
| 602 void ciTypeFlow::StateVector::do_getfield(ciBytecodeStream* str) { | |
| 603 // could add assert here for type of object. | |
| 604 pop_object(); | |
| 605 do_getstatic(str); | |
| 606 } | |
| 607 | |
| 608 // ------------------------------------------------------------------ | |
| 609 // ciTypeFlow::StateVector::do_getstatic | |
| 610 void ciTypeFlow::StateVector::do_getstatic(ciBytecodeStream* str) { | |
| 611 bool will_link; | |
| 612 ciField* field = str->get_field(will_link); | |
| 613 if (!will_link) { | |
| 614 trap(str, field->holder(), str->get_field_holder_index()); | |
| 615 } else { | |
| 616 ciType* field_type = field->type(); | |
| 617 if (!field_type->is_loaded()) { | |
| 618 // Normally, we need the field's type to be loaded if we are to | |
| 619 // do anything interesting with its value. | |
| 620 // We used to do this: trap(str, str->get_field_signature_index()); | |
| 621 // | |
| 622 // There is one good reason not to trap here. Execution can | |
| 623 // get past this "getfield" or "getstatic" if the value of | |
| 624 // the field is null. As long as the value is null, the class | |
| 625 // does not need to be loaded! The compiler must assume that | |
| 626 // the value of the unloaded class reference is null; if the code | |
| 627 // ever sees a non-null value, loading has occurred. | |
| 628 // | |
| 629 // This actually happens often enough to be annoying. If the | |
| 630 // compiler throws an uncommon trap at this bytecode, you can | |
| 631 // get an endless loop of recompilations, when all the code | |
| 632 // needs to do is load a series of null values. Also, a trap | |
| 633 // here can make an OSR entry point unreachable, triggering the | |
| 634 // assert on non_osr_block in ciTypeFlow::get_start_state. | |
| 635 // (See bug 4379915.) | |
| 636 do_null_assert(field_type->as_klass()); | |
| 637 } else { | |
| 638 push_translate(field_type); | |
| 639 } | |
| 640 } | |
| 641 } | |
| 642 | |
| 643 // ------------------------------------------------------------------ | |
| 644 // ciTypeFlow::StateVector::do_invoke | |
| 645 void ciTypeFlow::StateVector::do_invoke(ciBytecodeStream* str, | |
| 646 bool has_receiver) { | |
| 647 bool will_link; | |
| 648 ciMethod* method = str->get_method(will_link); | |
| 649 if (!will_link) { | |
| 650 // We weren't able to find the method. | |
|
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651 if (str->cur_bc() == Bytecodes::_invokedynamic) { |
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652 trap(str, NULL, |
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653 Deoptimization::make_trap_request |
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654 (Deoptimization::Reason_uninitialized, |
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655 Deoptimization::Action_reinterpret)); |
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656 } else { |
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657 ciKlass* unloaded_holder = method->holder(); |
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658 trap(str, unloaded_holder, str->get_method_holder_index()); |
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659 } |
| 0 | 660 } else { |
| 661 ciSignature* signature = method->signature(); | |
| 662 ciSignatureStream sigstr(signature); | |
| 663 int arg_size = signature->size(); | |
| 664 int stack_base = stack_size() - arg_size; | |
| 665 int i = 0; | |
| 666 for( ; !sigstr.at_return_type(); sigstr.next()) { | |
| 667 ciType* type = sigstr.type(); | |
| 668 ciType* stack_type = type_at(stack(stack_base + i++)); | |
| 669 // Do I want to check this type? | |
| 670 // assert(stack_type->is_subtype_of(type), "bad type for field value"); | |
| 671 if (type->is_two_word()) { | |
| 672 ciType* stack_type2 = type_at(stack(stack_base + i++)); | |
| 673 assert(stack_type2->equals(half_type(type)), "must be 2nd half"); | |
| 674 } | |
| 675 } | |
| 676 assert(arg_size == i, "must match"); | |
| 677 for (int j = 0; j < arg_size; j++) { | |
| 678 pop(); | |
| 679 } | |
| 680 if (has_receiver) { | |
| 681 // Check this? | |
| 682 pop_object(); | |
| 683 } | |
| 684 assert(!sigstr.is_done(), "must have return type"); | |
| 685 ciType* return_type = sigstr.type(); | |
| 686 if (!return_type->is_void()) { | |
| 687 if (!return_type->is_loaded()) { | |
| 688 // As in do_getstatic(), generally speaking, we need the return type to | |
| 689 // be loaded if we are to do anything interesting with its value. | |
| 690 // We used to do this: trap(str, str->get_method_signature_index()); | |
| 691 // | |
| 692 // We do not trap here since execution can get past this invoke if | |
| 693 // the return value is null. As long as the value is null, the class | |
| 694 // does not need to be loaded! The compiler must assume that | |
| 695 // the value of the unloaded class reference is null; if the code | |
| 696 // ever sees a non-null value, loading has occurred. | |
| 697 // | |
| 698 // See do_getstatic() for similar explanation, as well as bug 4684993. | |
| 699 do_null_assert(return_type->as_klass()); | |
| 700 } else { | |
| 701 push_translate(return_type); | |
| 702 } | |
| 703 } | |
| 704 } | |
| 705 } | |
| 706 | |
| 707 // ------------------------------------------------------------------ | |
| 708 // ciTypeFlow::StateVector::do_jsr | |
| 709 void ciTypeFlow::StateVector::do_jsr(ciBytecodeStream* str) { | |
| 710 push(ciReturnAddress::make(str->next_bci())); | |
| 711 } | |
| 712 | |
| 713 // ------------------------------------------------------------------ | |
| 714 // ciTypeFlow::StateVector::do_ldc | |
| 715 void ciTypeFlow::StateVector::do_ldc(ciBytecodeStream* str) { | |
| 716 ciConstant con = str->get_constant(); | |
| 717 BasicType basic_type = con.basic_type(); | |
| 718 if (basic_type == T_ILLEGAL) { | |
| 719 // OutOfMemoryError in the CI while loading constant | |
| 720 push_null(); | |
| 721 outer()->record_failure("ldc did not link"); | |
| 722 return; | |
| 723 } | |
| 724 if (basic_type == T_OBJECT || basic_type == T_ARRAY) { | |
| 725 ciObject* obj = con.as_object(); | |
| 726 if (obj->is_null_object()) { | |
| 727 push_null(); | |
| 728 } else { | |
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729 assert(!obj->is_klass(), "must be java_mirror of klass"); |
| 0 | 730 push_object(obj->klass()); |
| 731 } | |
| 732 } else { | |
| 733 push_translate(ciType::make(basic_type)); | |
| 734 } | |
| 735 } | |
| 736 | |
| 737 // ------------------------------------------------------------------ | |
| 738 // ciTypeFlow::StateVector::do_multianewarray | |
| 739 void ciTypeFlow::StateVector::do_multianewarray(ciBytecodeStream* str) { | |
| 740 int dimensions = str->get_dimensions(); | |
| 741 bool will_link; | |
| 742 ciArrayKlass* array_klass = str->get_klass(will_link)->as_array_klass(); | |
| 743 if (!will_link) { | |
| 744 trap(str, array_klass, str->get_klass_index()); | |
| 745 } else { | |
| 746 for (int i = 0; i < dimensions; i++) { | |
| 747 pop_int(); | |
| 748 } | |
| 749 push_object(array_klass); | |
| 750 } | |
| 751 } | |
| 752 | |
| 753 // ------------------------------------------------------------------ | |
| 754 // ciTypeFlow::StateVector::do_new | |
| 755 void ciTypeFlow::StateVector::do_new(ciBytecodeStream* str) { | |
| 756 bool will_link; | |
| 757 ciKlass* klass = str->get_klass(will_link); | |
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758 if (!will_link || str->is_unresolved_klass()) { |
| 0 | 759 trap(str, klass, str->get_klass_index()); |
| 760 } else { | |
| 761 push_object(klass); | |
| 762 } | |
| 763 } | |
| 764 | |
| 765 // ------------------------------------------------------------------ | |
| 766 // ciTypeFlow::StateVector::do_newarray | |
| 767 void ciTypeFlow::StateVector::do_newarray(ciBytecodeStream* str) { | |
| 768 pop_int(); | |
| 769 ciKlass* klass = ciTypeArrayKlass::make((BasicType)str->get_index()); | |
| 770 push_object(klass); | |
| 771 } | |
| 772 | |
| 773 // ------------------------------------------------------------------ | |
| 774 // ciTypeFlow::StateVector::do_putfield | |
| 775 void ciTypeFlow::StateVector::do_putfield(ciBytecodeStream* str) { | |
| 776 do_putstatic(str); | |
| 777 if (_trap_bci != -1) return; // unloaded field holder, etc. | |
| 778 // could add assert here for type of object. | |
| 779 pop_object(); | |
| 780 } | |
| 781 | |
| 782 // ------------------------------------------------------------------ | |
| 783 // ciTypeFlow::StateVector::do_putstatic | |
| 784 void ciTypeFlow::StateVector::do_putstatic(ciBytecodeStream* str) { | |
| 785 bool will_link; | |
| 786 ciField* field = str->get_field(will_link); | |
| 787 if (!will_link) { | |
| 788 trap(str, field->holder(), str->get_field_holder_index()); | |
| 789 } else { | |
| 790 ciType* field_type = field->type(); | |
| 791 ciType* type = pop_value(); | |
| 792 // Do I want to check this type? | |
| 793 // assert(type->is_subtype_of(field_type), "bad type for field value"); | |
| 794 if (field_type->is_two_word()) { | |
| 795 ciType* type2 = pop_value(); | |
| 796 assert(type2->is_two_word(), "must be 2nd half"); | |
| 797 assert(type == half_type(type2), "must be 2nd half"); | |
| 798 } | |
| 799 } | |
| 800 } | |
| 801 | |
| 802 // ------------------------------------------------------------------ | |
| 803 // ciTypeFlow::StateVector::do_ret | |
| 804 void ciTypeFlow::StateVector::do_ret(ciBytecodeStream* str) { | |
| 805 Cell index = local(str->get_index()); | |
| 806 | |
| 807 ciType* address = type_at(index); | |
| 808 assert(address->is_return_address(), "bad return address"); | |
| 809 set_type_at(index, bottom_type()); | |
| 810 } | |
| 811 | |
| 812 // ------------------------------------------------------------------ | |
| 813 // ciTypeFlow::StateVector::trap | |
| 814 // | |
| 815 // Stop interpretation of this path with a trap. | |
| 816 void ciTypeFlow::StateVector::trap(ciBytecodeStream* str, ciKlass* klass, int index) { | |
| 817 _trap_bci = str->cur_bci(); | |
| 818 _trap_index = index; | |
| 819 | |
| 820 // Log information about this trap: | |
| 821 CompileLog* log = outer()->env()->log(); | |
| 822 if (log != NULL) { | |
| 823 int mid = log->identify(outer()->method()); | |
| 824 int kid = (klass == NULL)? -1: log->identify(klass); | |
| 825 log->begin_elem("uncommon_trap method='%d' bci='%d'", mid, str->cur_bci()); | |
| 826 char buf[100]; | |
| 827 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), | |
| 828 index)); | |
| 829 if (kid >= 0) | |
| 830 log->print(" klass='%d'", kid); | |
| 831 log->end_elem(); | |
| 832 } | |
| 833 } | |
| 834 | |
| 835 // ------------------------------------------------------------------ | |
| 836 // ciTypeFlow::StateVector::do_null_assert | |
| 837 // Corresponds to graphKit::do_null_assert. | |
| 838 void ciTypeFlow::StateVector::do_null_assert(ciKlass* unloaded_klass) { | |
| 839 if (unloaded_klass->is_loaded()) { | |
| 840 // We failed to link, but we can still compute with this class, | |
| 841 // since it is loaded somewhere. The compiler will uncommon_trap | |
| 842 // if the object is not null, but the typeflow pass can not assume | |
| 843 // that the object will be null, otherwise it may incorrectly tell | |
| 844 // the parser that an object is known to be null. 4761344, 4807707 | |
| 845 push_object(unloaded_klass); | |
| 846 } else { | |
| 847 // The class is not loaded anywhere. It is safe to model the | |
| 848 // null in the typestates, because we can compile in a null check | |
| 849 // which will deoptimize us if someone manages to load the | |
| 850 // class later. | |
| 851 push_null(); | |
| 852 } | |
| 853 } | |
| 854 | |
| 855 | |
| 856 // ------------------------------------------------------------------ | |
| 857 // ciTypeFlow::StateVector::apply_one_bytecode | |
| 858 // | |
| 859 // Apply the effect of one bytecode to this StateVector | |
| 860 bool ciTypeFlow::StateVector::apply_one_bytecode(ciBytecodeStream* str) { | |
| 861 _trap_bci = -1; | |
| 862 _trap_index = 0; | |
| 863 | |
| 864 if (CITraceTypeFlow) { | |
| 865 tty->print_cr(">> Interpreting bytecode %d:%s", str->cur_bci(), | |
| 866 Bytecodes::name(str->cur_bc())); | |
| 867 } | |
| 868 | |
| 869 switch(str->cur_bc()) { | |
| 870 case Bytecodes::_aaload: do_aaload(str); break; | |
| 871 | |
| 872 case Bytecodes::_aastore: | |
| 873 { | |
| 874 pop_object(); | |
| 875 pop_int(); | |
| 876 pop_objArray(); | |
| 877 break; | |
| 878 } | |
| 879 case Bytecodes::_aconst_null: | |
| 880 { | |
| 881 push_null(); | |
| 882 break; | |
| 883 } | |
| 884 case Bytecodes::_aload: load_local_object(str->get_index()); break; | |
| 885 case Bytecodes::_aload_0: load_local_object(0); break; | |
| 886 case Bytecodes::_aload_1: load_local_object(1); break; | |
| 887 case Bytecodes::_aload_2: load_local_object(2); break; | |
| 888 case Bytecodes::_aload_3: load_local_object(3); break; | |
| 889 | |
| 890 case Bytecodes::_anewarray: | |
| 891 { | |
| 892 pop_int(); | |
| 893 bool will_link; | |
| 894 ciKlass* element_klass = str->get_klass(will_link); | |
| 895 if (!will_link) { | |
| 896 trap(str, element_klass, str->get_klass_index()); | |
| 897 } else { | |
| 898 push_object(ciObjArrayKlass::make(element_klass)); | |
| 899 } | |
| 900 break; | |
| 901 } | |
| 902 case Bytecodes::_areturn: | |
| 903 case Bytecodes::_ifnonnull: | |
| 904 case Bytecodes::_ifnull: | |
| 905 { | |
| 906 pop_object(); | |
| 907 break; | |
| 908 } | |
| 909 case Bytecodes::_monitorenter: | |
| 910 { | |
| 911 pop_object(); | |
| 912 set_monitor_count(monitor_count() + 1); | |
| 913 break; | |
| 914 } | |
| 915 case Bytecodes::_monitorexit: | |
| 916 { | |
| 917 pop_object(); | |
| 918 assert(monitor_count() > 0, "must be a monitor to exit from"); | |
| 919 set_monitor_count(monitor_count() - 1); | |
| 920 break; | |
| 921 } | |
| 922 case Bytecodes::_arraylength: | |
| 923 { | |
| 924 pop_array(); | |
| 925 push_int(); | |
| 926 break; | |
| 927 } | |
| 928 case Bytecodes::_astore: store_local_object(str->get_index()); break; | |
| 929 case Bytecodes::_astore_0: store_local_object(0); break; | |
| 930 case Bytecodes::_astore_1: store_local_object(1); break; | |
| 931 case Bytecodes::_astore_2: store_local_object(2); break; | |
| 932 case Bytecodes::_astore_3: store_local_object(3); break; | |
| 933 | |
| 934 case Bytecodes::_athrow: | |
| 935 { | |
| 936 NEEDS_CLEANUP; | |
| 937 pop_object(); | |
| 938 break; | |
| 939 } | |
| 940 case Bytecodes::_baload: | |
| 941 case Bytecodes::_caload: | |
| 942 case Bytecodes::_iaload: | |
| 943 case Bytecodes::_saload: | |
| 944 { | |
| 945 pop_int(); | |
| 946 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
| 947 // Put assert here for right type? | |
| 948 push_int(); | |
| 949 break; | |
| 950 } | |
| 951 case Bytecodes::_bastore: | |
| 952 case Bytecodes::_castore: | |
| 953 case Bytecodes::_iastore: | |
| 954 case Bytecodes::_sastore: | |
| 955 { | |
| 956 pop_int(); | |
| 957 pop_int(); | |
| 958 pop_typeArray(); | |
| 959 // assert here? | |
| 960 break; | |
| 961 } | |
| 962 case Bytecodes::_bipush: | |
| 963 case Bytecodes::_iconst_m1: | |
| 964 case Bytecodes::_iconst_0: | |
| 965 case Bytecodes::_iconst_1: | |
| 966 case Bytecodes::_iconst_2: | |
| 967 case Bytecodes::_iconst_3: | |
| 968 case Bytecodes::_iconst_4: | |
| 969 case Bytecodes::_iconst_5: | |
| 970 case Bytecodes::_sipush: | |
| 971 { | |
| 972 push_int(); | |
| 973 break; | |
| 974 } | |
| 975 case Bytecodes::_checkcast: do_checkcast(str); break; | |
| 976 | |
| 977 case Bytecodes::_d2f: | |
| 978 { | |
| 979 pop_double(); | |
| 980 push_float(); | |
| 981 break; | |
| 982 } | |
| 983 case Bytecodes::_d2i: | |
| 984 { | |
| 985 pop_double(); | |
| 986 push_int(); | |
| 987 break; | |
| 988 } | |
| 989 case Bytecodes::_d2l: | |
| 990 { | |
| 991 pop_double(); | |
| 992 push_long(); | |
| 993 break; | |
| 994 } | |
| 995 case Bytecodes::_dadd: | |
| 996 case Bytecodes::_ddiv: | |
| 997 case Bytecodes::_dmul: | |
| 998 case Bytecodes::_drem: | |
| 999 case Bytecodes::_dsub: | |
| 1000 { | |
| 1001 pop_double(); | |
| 1002 pop_double(); | |
| 1003 push_double(); | |
| 1004 break; | |
| 1005 } | |
| 1006 case Bytecodes::_daload: | |
| 1007 { | |
| 1008 pop_int(); | |
| 1009 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
| 1010 // Put assert here for right type? | |
| 1011 push_double(); | |
| 1012 break; | |
| 1013 } | |
| 1014 case Bytecodes::_dastore: | |
| 1015 { | |
| 1016 pop_double(); | |
| 1017 pop_int(); | |
| 1018 pop_typeArray(); | |
| 1019 // assert here? | |
| 1020 break; | |
| 1021 } | |
| 1022 case Bytecodes::_dcmpg: | |
| 1023 case Bytecodes::_dcmpl: | |
| 1024 { | |
| 1025 pop_double(); | |
| 1026 pop_double(); | |
| 1027 push_int(); | |
| 1028 break; | |
| 1029 } | |
| 1030 case Bytecodes::_dconst_0: | |
| 1031 case Bytecodes::_dconst_1: | |
| 1032 { | |
| 1033 push_double(); | |
| 1034 break; | |
| 1035 } | |
| 1036 case Bytecodes::_dload: load_local_double(str->get_index()); break; | |
| 1037 case Bytecodes::_dload_0: load_local_double(0); break; | |
| 1038 case Bytecodes::_dload_1: load_local_double(1); break; | |
| 1039 case Bytecodes::_dload_2: load_local_double(2); break; | |
| 1040 case Bytecodes::_dload_3: load_local_double(3); break; | |
| 1041 | |
| 1042 case Bytecodes::_dneg: | |
| 1043 { | |
| 1044 pop_double(); | |
| 1045 push_double(); | |
| 1046 break; | |
| 1047 } | |
| 1048 case Bytecodes::_dreturn: | |
| 1049 { | |
| 1050 pop_double(); | |
| 1051 break; | |
| 1052 } | |
| 1053 case Bytecodes::_dstore: store_local_double(str->get_index()); break; | |
| 1054 case Bytecodes::_dstore_0: store_local_double(0); break; | |
| 1055 case Bytecodes::_dstore_1: store_local_double(1); break; | |
| 1056 case Bytecodes::_dstore_2: store_local_double(2); break; | |
| 1057 case Bytecodes::_dstore_3: store_local_double(3); break; | |
| 1058 | |
| 1059 case Bytecodes::_dup: | |
| 1060 { | |
| 1061 push(type_at_tos()); | |
| 1062 break; | |
| 1063 } | |
| 1064 case Bytecodes::_dup_x1: | |
| 1065 { | |
| 1066 ciType* value1 = pop_value(); | |
| 1067 ciType* value2 = pop_value(); | |
| 1068 push(value1); | |
| 1069 push(value2); | |
| 1070 push(value1); | |
| 1071 break; | |
| 1072 } | |
| 1073 case Bytecodes::_dup_x2: | |
| 1074 { | |
| 1075 ciType* value1 = pop_value(); | |
| 1076 ciType* value2 = pop_value(); | |
| 1077 ciType* value3 = pop_value(); | |
| 1078 push(value1); | |
| 1079 push(value3); | |
| 1080 push(value2); | |
| 1081 push(value1); | |
| 1082 break; | |
| 1083 } | |
| 1084 case Bytecodes::_dup2: | |
| 1085 { | |
| 1086 ciType* value1 = pop_value(); | |
| 1087 ciType* value2 = pop_value(); | |
| 1088 push(value2); | |
| 1089 push(value1); | |
| 1090 push(value2); | |
| 1091 push(value1); | |
| 1092 break; | |
| 1093 } | |
| 1094 case Bytecodes::_dup2_x1: | |
| 1095 { | |
| 1096 ciType* value1 = pop_value(); | |
| 1097 ciType* value2 = pop_value(); | |
| 1098 ciType* value3 = pop_value(); | |
| 1099 push(value2); | |
| 1100 push(value1); | |
| 1101 push(value3); | |
| 1102 push(value2); | |
| 1103 push(value1); | |
| 1104 break; | |
| 1105 } | |
| 1106 case Bytecodes::_dup2_x2: | |
| 1107 { | |
| 1108 ciType* value1 = pop_value(); | |
| 1109 ciType* value2 = pop_value(); | |
| 1110 ciType* value3 = pop_value(); | |
| 1111 ciType* value4 = pop_value(); | |
| 1112 push(value2); | |
| 1113 push(value1); | |
| 1114 push(value4); | |
| 1115 push(value3); | |
| 1116 push(value2); | |
| 1117 push(value1); | |
| 1118 break; | |
| 1119 } | |
| 1120 case Bytecodes::_f2d: | |
| 1121 { | |
| 1122 pop_float(); | |
| 1123 push_double(); | |
| 1124 break; | |
| 1125 } | |
| 1126 case Bytecodes::_f2i: | |
| 1127 { | |
| 1128 pop_float(); | |
| 1129 push_int(); | |
| 1130 break; | |
| 1131 } | |
| 1132 case Bytecodes::_f2l: | |
| 1133 { | |
| 1134 pop_float(); | |
| 1135 push_long(); | |
| 1136 break; | |
| 1137 } | |
| 1138 case Bytecodes::_fadd: | |
| 1139 case Bytecodes::_fdiv: | |
| 1140 case Bytecodes::_fmul: | |
| 1141 case Bytecodes::_frem: | |
| 1142 case Bytecodes::_fsub: | |
| 1143 { | |
| 1144 pop_float(); | |
| 1145 pop_float(); | |
| 1146 push_float(); | |
| 1147 break; | |
| 1148 } | |
| 1149 case Bytecodes::_faload: | |
| 1150 { | |
| 1151 pop_int(); | |
| 1152 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
| 1153 // Put assert here. | |
| 1154 push_float(); | |
| 1155 break; | |
| 1156 } | |
| 1157 case Bytecodes::_fastore: | |
| 1158 { | |
| 1159 pop_float(); | |
| 1160 pop_int(); | |
| 1161 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
| 1162 // Put assert here. | |
| 1163 break; | |
| 1164 } | |
| 1165 case Bytecodes::_fcmpg: | |
| 1166 case Bytecodes::_fcmpl: | |
| 1167 { | |
| 1168 pop_float(); | |
| 1169 pop_float(); | |
| 1170 push_int(); | |
| 1171 break; | |
| 1172 } | |
| 1173 case Bytecodes::_fconst_0: | |
| 1174 case Bytecodes::_fconst_1: | |
| 1175 case Bytecodes::_fconst_2: | |
| 1176 { | |
| 1177 push_float(); | |
| 1178 break; | |
| 1179 } | |
| 1180 case Bytecodes::_fload: load_local_float(str->get_index()); break; | |
| 1181 case Bytecodes::_fload_0: load_local_float(0); break; | |
| 1182 case Bytecodes::_fload_1: load_local_float(1); break; | |
| 1183 case Bytecodes::_fload_2: load_local_float(2); break; | |
| 1184 case Bytecodes::_fload_3: load_local_float(3); break; | |
| 1185 | |
| 1186 case Bytecodes::_fneg: | |
| 1187 { | |
| 1188 pop_float(); | |
| 1189 push_float(); | |
| 1190 break; | |
| 1191 } | |
| 1192 case Bytecodes::_freturn: | |
| 1193 { | |
| 1194 pop_float(); | |
| 1195 break; | |
| 1196 } | |
| 1197 case Bytecodes::_fstore: store_local_float(str->get_index()); break; | |
| 1198 case Bytecodes::_fstore_0: store_local_float(0); break; | |
| 1199 case Bytecodes::_fstore_1: store_local_float(1); break; | |
| 1200 case Bytecodes::_fstore_2: store_local_float(2); break; | |
| 1201 case Bytecodes::_fstore_3: store_local_float(3); break; | |
| 1202 | |
| 1203 case Bytecodes::_getfield: do_getfield(str); break; | |
| 1204 case Bytecodes::_getstatic: do_getstatic(str); break; | |
| 1205 | |
| 1206 case Bytecodes::_goto: | |
| 1207 case Bytecodes::_goto_w: | |
| 1208 case Bytecodes::_nop: | |
| 1209 case Bytecodes::_return: | |
| 1210 { | |
| 1211 // do nothing. | |
| 1212 break; | |
| 1213 } | |
| 1214 case Bytecodes::_i2b: | |
| 1215 case Bytecodes::_i2c: | |
| 1216 case Bytecodes::_i2s: | |
| 1217 case Bytecodes::_ineg: | |
| 1218 { | |
| 1219 pop_int(); | |
| 1220 push_int(); | |
| 1221 break; | |
| 1222 } | |
| 1223 case Bytecodes::_i2d: | |
| 1224 { | |
| 1225 pop_int(); | |
| 1226 push_double(); | |
| 1227 break; | |
| 1228 } | |
| 1229 case Bytecodes::_i2f: | |
| 1230 { | |
| 1231 pop_int(); | |
| 1232 push_float(); | |
| 1233 break; | |
| 1234 } | |
| 1235 case Bytecodes::_i2l: | |
| 1236 { | |
| 1237 pop_int(); | |
| 1238 push_long(); | |
| 1239 break; | |
| 1240 } | |
| 1241 case Bytecodes::_iadd: | |
| 1242 case Bytecodes::_iand: | |
| 1243 case Bytecodes::_idiv: | |
| 1244 case Bytecodes::_imul: | |
| 1245 case Bytecodes::_ior: | |
| 1246 case Bytecodes::_irem: | |
| 1247 case Bytecodes::_ishl: | |
| 1248 case Bytecodes::_ishr: | |
| 1249 case Bytecodes::_isub: | |
| 1250 case Bytecodes::_iushr: | |
| 1251 case Bytecodes::_ixor: | |
| 1252 { | |
| 1253 pop_int(); | |
| 1254 pop_int(); | |
| 1255 push_int(); | |
| 1256 break; | |
| 1257 } | |
| 1258 case Bytecodes::_if_acmpeq: | |
| 1259 case Bytecodes::_if_acmpne: | |
| 1260 { | |
| 1261 pop_object(); | |
| 1262 pop_object(); | |
| 1263 break; | |
| 1264 } | |
| 1265 case Bytecodes::_if_icmpeq: | |
| 1266 case Bytecodes::_if_icmpge: | |
| 1267 case Bytecodes::_if_icmpgt: | |
| 1268 case Bytecodes::_if_icmple: | |
| 1269 case Bytecodes::_if_icmplt: | |
| 1270 case Bytecodes::_if_icmpne: | |
| 1271 { | |
| 1272 pop_int(); | |
| 1273 pop_int(); | |
| 1274 break; | |
| 1275 } | |
| 1276 case Bytecodes::_ifeq: | |
| 1277 case Bytecodes::_ifle: | |
| 1278 case Bytecodes::_iflt: | |
| 1279 case Bytecodes::_ifge: | |
| 1280 case Bytecodes::_ifgt: | |
| 1281 case Bytecodes::_ifne: | |
| 1282 case Bytecodes::_ireturn: | |
| 1283 case Bytecodes::_lookupswitch: | |
| 1284 case Bytecodes::_tableswitch: | |
| 1285 { | |
| 1286 pop_int(); | |
| 1287 break; | |
| 1288 } | |
| 1289 case Bytecodes::_iinc: | |
| 1290 { | |
|
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1291 int lnum = str->get_index(); |
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1292 check_int(local(lnum)); |
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1293 store_to_local(lnum); |
| 0 | 1294 break; |
| 1295 } | |
| 1296 case Bytecodes::_iload: load_local_int(str->get_index()); break; | |
| 1297 case Bytecodes::_iload_0: load_local_int(0); break; | |
| 1298 case Bytecodes::_iload_1: load_local_int(1); break; | |
| 1299 case Bytecodes::_iload_2: load_local_int(2); break; | |
| 1300 case Bytecodes::_iload_3: load_local_int(3); break; | |
| 1301 | |
| 1302 case Bytecodes::_instanceof: | |
| 1303 { | |
| 1304 // Check for uncommon trap: | |
| 1305 do_checkcast(str); | |
| 1306 pop_object(); | |
| 1307 push_int(); | |
| 1308 break; | |
| 1309 } | |
| 1310 case Bytecodes::_invokeinterface: do_invoke(str, true); break; | |
| 1311 case Bytecodes::_invokespecial: do_invoke(str, true); break; | |
| 1312 case Bytecodes::_invokestatic: do_invoke(str, false); break; | |
| 1313 case Bytecodes::_invokevirtual: do_invoke(str, true); break; | |
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1314 case Bytecodes::_invokedynamic: do_invoke(str, false); break; |
| 0 | 1315 |
| 1316 case Bytecodes::_istore: store_local_int(str->get_index()); break; | |
| 1317 case Bytecodes::_istore_0: store_local_int(0); break; | |
| 1318 case Bytecodes::_istore_1: store_local_int(1); break; | |
| 1319 case Bytecodes::_istore_2: store_local_int(2); break; | |
| 1320 case Bytecodes::_istore_3: store_local_int(3); break; | |
| 1321 | |
| 1322 case Bytecodes::_jsr: | |
| 1323 case Bytecodes::_jsr_w: do_jsr(str); break; | |
| 1324 | |
| 1325 case Bytecodes::_l2d: | |
| 1326 { | |
| 1327 pop_long(); | |
| 1328 push_double(); | |
| 1329 break; | |
| 1330 } | |
| 1331 case Bytecodes::_l2f: | |
| 1332 { | |
| 1333 pop_long(); | |
| 1334 push_float(); | |
| 1335 break; | |
| 1336 } | |
| 1337 case Bytecodes::_l2i: | |
| 1338 { | |
| 1339 pop_long(); | |
| 1340 push_int(); | |
| 1341 break; | |
| 1342 } | |
| 1343 case Bytecodes::_ladd: | |
| 1344 case Bytecodes::_land: | |
| 1345 case Bytecodes::_ldiv: | |
| 1346 case Bytecodes::_lmul: | |
| 1347 case Bytecodes::_lor: | |
| 1348 case Bytecodes::_lrem: | |
| 1349 case Bytecodes::_lsub: | |
| 1350 case Bytecodes::_lxor: | |
| 1351 { | |
| 1352 pop_long(); | |
| 1353 pop_long(); | |
| 1354 push_long(); | |
| 1355 break; | |
| 1356 } | |
| 1357 case Bytecodes::_laload: | |
| 1358 { | |
| 1359 pop_int(); | |
| 1360 ciTypeArrayKlass* array_klass = pop_typeArray(); | |
| 1361 // Put assert here for right type? | |
| 1362 push_long(); | |
| 1363 break; | |
| 1364 } | |
| 1365 case Bytecodes::_lastore: | |
| 1366 { | |
| 1367 pop_long(); | |
| 1368 pop_int(); | |
| 1369 pop_typeArray(); | |
| 1370 // assert here? | |
| 1371 break; | |
| 1372 } | |
| 1373 case Bytecodes::_lcmp: | |
| 1374 { | |
| 1375 pop_long(); | |
| 1376 pop_long(); | |
| 1377 push_int(); | |
| 1378 break; | |
| 1379 } | |
| 1380 case Bytecodes::_lconst_0: | |
| 1381 case Bytecodes::_lconst_1: | |
| 1382 { | |
| 1383 push_long(); | |
| 1384 break; | |
| 1385 } | |
| 1386 case Bytecodes::_ldc: | |
| 1387 case Bytecodes::_ldc_w: | |
| 1388 case Bytecodes::_ldc2_w: | |
| 1389 { | |
| 1390 do_ldc(str); | |
| 1391 break; | |
| 1392 } | |
| 1393 | |
| 1394 case Bytecodes::_lload: load_local_long(str->get_index()); break; | |
| 1395 case Bytecodes::_lload_0: load_local_long(0); break; | |
| 1396 case Bytecodes::_lload_1: load_local_long(1); break; | |
| 1397 case Bytecodes::_lload_2: load_local_long(2); break; | |
| 1398 case Bytecodes::_lload_3: load_local_long(3); break; | |
| 1399 | |
| 1400 case Bytecodes::_lneg: | |
| 1401 { | |
| 1402 pop_long(); | |
| 1403 push_long(); | |
| 1404 break; | |
| 1405 } | |
| 1406 case Bytecodes::_lreturn: | |
| 1407 { | |
| 1408 pop_long(); | |
| 1409 break; | |
| 1410 } | |
| 1411 case Bytecodes::_lshl: | |
| 1412 case Bytecodes::_lshr: | |
| 1413 case Bytecodes::_lushr: | |
| 1414 { | |
| 1415 pop_int(); | |
| 1416 pop_long(); | |
| 1417 push_long(); | |
| 1418 break; | |
| 1419 } | |
| 1420 case Bytecodes::_lstore: store_local_long(str->get_index()); break; | |
| 1421 case Bytecodes::_lstore_0: store_local_long(0); break; | |
| 1422 case Bytecodes::_lstore_1: store_local_long(1); break; | |
| 1423 case Bytecodes::_lstore_2: store_local_long(2); break; | |
| 1424 case Bytecodes::_lstore_3: store_local_long(3); break; | |
| 1425 | |
| 1426 case Bytecodes::_multianewarray: do_multianewarray(str); break; | |
| 1427 | |
| 1428 case Bytecodes::_new: do_new(str); break; | |
| 1429 | |
| 1430 case Bytecodes::_newarray: do_newarray(str); break; | |
| 1431 | |
| 1432 case Bytecodes::_pop: | |
| 1433 { | |
| 1434 pop(); | |
| 1435 break; | |
| 1436 } | |
| 1437 case Bytecodes::_pop2: | |
| 1438 { | |
| 1439 pop(); | |
| 1440 pop(); | |
| 1441 break; | |
| 1442 } | |
| 1443 | |
| 1444 case Bytecodes::_putfield: do_putfield(str); break; | |
| 1445 case Bytecodes::_putstatic: do_putstatic(str); break; | |
| 1446 | |
| 1447 case Bytecodes::_ret: do_ret(str); break; | |
| 1448 | |
| 1449 case Bytecodes::_swap: | |
| 1450 { | |
| 1451 ciType* value1 = pop_value(); | |
| 1452 ciType* value2 = pop_value(); | |
| 1453 push(value1); | |
| 1454 push(value2); | |
| 1455 break; | |
| 1456 } | |
| 1457 case Bytecodes::_wide: | |
| 1458 default: | |
| 1459 { | |
| 1460 // The iterator should skip this. | |
| 1461 ShouldNotReachHere(); | |
| 1462 break; | |
| 1463 } | |
| 1464 } | |
| 1465 | |
| 1466 if (CITraceTypeFlow) { | |
| 1467 print_on(tty); | |
| 1468 } | |
| 1469 | |
| 1470 return (_trap_bci != -1); | |
| 1471 } | |
| 1472 | |
| 1473 #ifndef PRODUCT | |
| 1474 // ------------------------------------------------------------------ | |
| 1475 // ciTypeFlow::StateVector::print_cell_on | |
| 1476 void ciTypeFlow::StateVector::print_cell_on(outputStream* st, Cell c) const { | |
| 1477 ciType* type = type_at(c); | |
| 1478 if (type == top_type()) { | |
| 1479 st->print("top"); | |
| 1480 } else if (type == bottom_type()) { | |
| 1481 st->print("bottom"); | |
| 1482 } else if (type == null_type()) { | |
| 1483 st->print("null"); | |
| 1484 } else if (type == long2_type()) { | |
| 1485 st->print("long2"); | |
| 1486 } else if (type == double2_type()) { | |
| 1487 st->print("double2"); | |
| 1488 } else if (is_int(type)) { | |
| 1489 st->print("int"); | |
| 1490 } else if (is_long(type)) { | |
| 1491 st->print("long"); | |
| 1492 } else if (is_float(type)) { | |
| 1493 st->print("float"); | |
| 1494 } else if (is_double(type)) { | |
| 1495 st->print("double"); | |
| 1496 } else if (type->is_return_address()) { | |
| 1497 st->print("address(%d)", type->as_return_address()->bci()); | |
| 1498 } else { | |
| 1499 if (type->is_klass()) { | |
| 1500 type->as_klass()->name()->print_symbol_on(st); | |
| 1501 } else { | |
| 1502 st->print("UNEXPECTED TYPE"); | |
| 1503 type->print(); | |
| 1504 } | |
| 1505 } | |
| 1506 } | |
| 1507 | |
| 1508 // ------------------------------------------------------------------ | |
| 1509 // ciTypeFlow::StateVector::print_on | |
| 1510 void ciTypeFlow::StateVector::print_on(outputStream* st) const { | |
| 1511 int num_locals = _outer->max_locals(); | |
| 1512 int num_stack = stack_size(); | |
| 1513 int num_monitors = monitor_count(); | |
| 1514 st->print_cr(" State : locals %d, stack %d, monitors %d", num_locals, num_stack, num_monitors); | |
| 1515 if (num_stack >= 0) { | |
| 1516 int i; | |
| 1517 for (i = 0; i < num_locals; i++) { | |
| 1518 st->print(" local %2d : ", i); | |
| 1519 print_cell_on(st, local(i)); | |
| 1520 st->cr(); | |
| 1521 } | |
| 1522 for (i = 0; i < num_stack; i++) { | |
| 1523 st->print(" stack %2d : ", i); | |
| 1524 print_cell_on(st, stack(i)); | |
| 1525 st->cr(); | |
| 1526 } | |
| 1527 } | |
| 1528 } | |
| 1529 #endif | |
| 1530 | |
|
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1531 |
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1532 // ------------------------------------------------------------------ |
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1533 // ciTypeFlow::SuccIter::next |
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1534 // |
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1535 void ciTypeFlow::SuccIter::next() { |
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1536 int succ_ct = _pred->successors()->length(); |
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1537 int next = _index + 1; |
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1538 if (next < succ_ct) { |
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1539 _index = next; |
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1540 _succ = _pred->successors()->at(next); |
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1541 return; |
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1542 } |
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1543 for (int i = next - succ_ct; i < _pred->exceptions()->length(); i++) { |
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1544 // Do not compile any code for unloaded exception types. |
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1545 // Following compiler passes are responsible for doing this also. |
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1546 ciInstanceKlass* exception_klass = _pred->exc_klasses()->at(i); |
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1547 if (exception_klass->is_loaded()) { |
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1548 _index = next; |
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1549 _succ = _pred->exceptions()->at(i); |
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1550 return; |
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1551 } |
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1552 next++; |
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1553 } |
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1554 _index = -1; |
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1555 _succ = NULL; |
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1556 } |
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1557 |
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1558 // ------------------------------------------------------------------ |
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1559 // ciTypeFlow::SuccIter::set_succ |
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1560 // |
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1561 void ciTypeFlow::SuccIter::set_succ(Block* succ) { |
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1562 int succ_ct = _pred->successors()->length(); |
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1563 if (_index < succ_ct) { |
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1564 _pred->successors()->at_put(_index, succ); |
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1565 } else { |
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1566 int idx = _index - succ_ct; |
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1567 _pred->exceptions()->at_put(idx, succ); |
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1568 } |
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1569 } |
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1570 |
| 0 | 1571 // ciTypeFlow::Block |
| 1572 // | |
| 1573 // A basic block. | |
| 1574 | |
| 1575 // ------------------------------------------------------------------ | |
| 1576 // ciTypeFlow::Block::Block | |
| 1577 ciTypeFlow::Block::Block(ciTypeFlow* outer, | |
| 1578 ciBlock *ciblk, | |
| 1579 ciTypeFlow::JsrSet* jsrs) { | |
| 1580 _ciblock = ciblk; | |
| 1581 _exceptions = NULL; | |
| 1582 _exc_klasses = NULL; | |
| 1583 _successors = NULL; | |
| 1584 _state = new (outer->arena()) StateVector(outer); | |
| 1585 JsrSet* new_jsrs = | |
| 1586 new (outer->arena()) JsrSet(outer->arena(), jsrs->size()); | |
| 1587 jsrs->copy_into(new_jsrs); | |
| 1588 _jsrs = new_jsrs; | |
| 1589 _next = NULL; | |
| 1590 _on_work_list = false; | |
|
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1591 _backedge_copy = false; |
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1592 _exception_entry = false; |
| 0 | 1593 _trap_bci = -1; |
| 1594 _trap_index = 0; | |
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1595 df_init(); |
| 0 | 1596 |
| 1597 if (CITraceTypeFlow) { | |
| 1598 tty->print_cr(">> Created new block"); | |
| 1599 print_on(tty); | |
| 1600 } | |
| 1601 | |
| 1602 assert(this->outer() == outer, "outer link set up"); | |
| 1603 assert(!outer->have_block_count(), "must not have mapped blocks yet"); | |
| 1604 } | |
| 1605 | |
| 1606 // ------------------------------------------------------------------ | |
|
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1607 // ciTypeFlow::Block::df_init |
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1608 void ciTypeFlow::Block::df_init() { |
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1609 _pre_order = -1; assert(!has_pre_order(), ""); |
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1610 _post_order = -1; assert(!has_post_order(), ""); |
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1611 _loop = NULL; |
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1612 _irreducible_entry = false; |
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1613 _rpo_next = NULL; |
| 0 | 1614 } |
| 1615 | |
| 1616 // ------------------------------------------------------------------ | |
| 1617 // ciTypeFlow::Block::successors | |
| 1618 // | |
| 1619 // Get the successors for this Block. | |
| 1620 GrowableArray<ciTypeFlow::Block*>* | |
| 1621 ciTypeFlow::Block::successors(ciBytecodeStream* str, | |
| 1622 ciTypeFlow::StateVector* state, | |
| 1623 ciTypeFlow::JsrSet* jsrs) { | |
| 1624 if (_successors == NULL) { | |
| 1625 if (CITraceTypeFlow) { | |
| 1626 tty->print(">> Computing successors for block "); | |
| 1627 print_value_on(tty); | |
| 1628 tty->cr(); | |
| 1629 } | |
| 1630 | |
| 1631 ciTypeFlow* analyzer = outer(); | |
| 1632 Arena* arena = analyzer->arena(); | |
| 1633 Block* block = NULL; | |
| 1634 bool has_successor = !has_trap() && | |
| 1635 (control() != ciBlock::fall_through_bci || limit() < analyzer->code_size()); | |
| 1636 if (!has_successor) { | |
| 1637 _successors = | |
| 1638 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1639 // No successors | |
| 1640 } else if (control() == ciBlock::fall_through_bci) { | |
| 1641 assert(str->cur_bci() == limit(), "bad block end"); | |
| 1642 // This block simply falls through to the next. | |
| 1643 _successors = | |
| 1644 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1645 | |
| 1646 Block* block = analyzer->block_at(limit(), _jsrs); | |
| 1647 assert(_successors->length() == FALL_THROUGH, ""); | |
| 1648 _successors->append(block); | |
| 1649 } else { | |
| 1650 int current_bci = str->cur_bci(); | |
| 1651 int next_bci = str->next_bci(); | |
| 1652 int branch_bci = -1; | |
| 1653 Block* target = NULL; | |
| 1654 assert(str->next_bci() == limit(), "bad block end"); | |
| 1655 // This block is not a simple fall-though. Interpret | |
| 1656 // the current bytecode to find our successors. | |
| 1657 switch (str->cur_bc()) { | |
| 1658 case Bytecodes::_ifeq: case Bytecodes::_ifne: | |
| 1659 case Bytecodes::_iflt: case Bytecodes::_ifge: | |
| 1660 case Bytecodes::_ifgt: case Bytecodes::_ifle: | |
| 1661 case Bytecodes::_if_icmpeq: case Bytecodes::_if_icmpne: | |
| 1662 case Bytecodes::_if_icmplt: case Bytecodes::_if_icmpge: | |
| 1663 case Bytecodes::_if_icmpgt: case Bytecodes::_if_icmple: | |
| 1664 case Bytecodes::_if_acmpeq: case Bytecodes::_if_acmpne: | |
| 1665 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: | |
| 1666 // Our successors are the branch target and the next bci. | |
| 1667 branch_bci = str->get_dest(); | |
| 1668 _successors = | |
| 1669 new (arena) GrowableArray<Block*>(arena, 2, 0, NULL); | |
| 1670 assert(_successors->length() == IF_NOT_TAKEN, ""); | |
| 1671 _successors->append(analyzer->block_at(next_bci, jsrs)); | |
| 1672 assert(_successors->length() == IF_TAKEN, ""); | |
| 1673 _successors->append(analyzer->block_at(branch_bci, jsrs)); | |
| 1674 break; | |
| 1675 | |
| 1676 case Bytecodes::_goto: | |
| 1677 branch_bci = str->get_dest(); | |
| 1678 _successors = | |
| 1679 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1680 assert(_successors->length() == GOTO_TARGET, ""); | |
|
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1681 _successors->append(analyzer->block_at(branch_bci, jsrs)); |
| 0 | 1682 break; |
| 1683 | |
| 1684 case Bytecodes::_jsr: | |
| 1685 branch_bci = str->get_dest(); | |
| 1686 _successors = | |
| 1687 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1688 assert(_successors->length() == GOTO_TARGET, ""); | |
| 1689 _successors->append(analyzer->block_at(branch_bci, jsrs)); | |
| 1690 break; | |
| 1691 | |
| 1692 case Bytecodes::_goto_w: | |
| 1693 case Bytecodes::_jsr_w: | |
| 1694 _successors = | |
| 1695 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1696 assert(_successors->length() == GOTO_TARGET, ""); | |
| 1697 _successors->append(analyzer->block_at(str->get_far_dest(), jsrs)); | |
| 1698 break; | |
| 1699 | |
| 1700 case Bytecodes::_tableswitch: { | |
| 2142 | 1701 Bytecode_tableswitch tableswitch(str); |
| 0 | 1702 |
| 2142 | 1703 int len = tableswitch.length(); |
| 0 | 1704 _successors = |
| 1705 new (arena) GrowableArray<Block*>(arena, len+1, 0, NULL); | |
| 2142 | 1706 int bci = current_bci + tableswitch.default_offset(); |
| 0 | 1707 Block* block = analyzer->block_at(bci, jsrs); |
| 1708 assert(_successors->length() == SWITCH_DEFAULT, ""); | |
| 1709 _successors->append(block); | |
| 1710 while (--len >= 0) { | |
| 2142 | 1711 int bci = current_bci + tableswitch.dest_offset_at(len); |
| 0 | 1712 block = analyzer->block_at(bci, jsrs); |
| 1713 assert(_successors->length() >= SWITCH_CASES, ""); | |
| 1714 _successors->append_if_missing(block); | |
| 1715 } | |
| 1716 break; | |
| 1717 } | |
| 1718 | |
| 1719 case Bytecodes::_lookupswitch: { | |
| 2142 | 1720 Bytecode_lookupswitch lookupswitch(str); |
| 0 | 1721 |
| 2142 | 1722 int npairs = lookupswitch.number_of_pairs(); |
| 0 | 1723 _successors = |
| 1724 new (arena) GrowableArray<Block*>(arena, npairs+1, 0, NULL); | |
| 2142 | 1725 int bci = current_bci + lookupswitch.default_offset(); |
| 0 | 1726 Block* block = analyzer->block_at(bci, jsrs); |
| 1727 assert(_successors->length() == SWITCH_DEFAULT, ""); | |
| 1728 _successors->append(block); | |
| 1729 while(--npairs >= 0) { | |
| 2142 | 1730 LookupswitchPair pair = lookupswitch.pair_at(npairs); |
| 1731 int bci = current_bci + pair.offset(); | |
| 0 | 1732 Block* block = analyzer->block_at(bci, jsrs); |
| 1733 assert(_successors->length() >= SWITCH_CASES, ""); | |
| 1734 _successors->append_if_missing(block); | |
| 1735 } | |
| 1736 break; | |
| 1737 } | |
| 1738 | |
| 1739 case Bytecodes::_athrow: case Bytecodes::_ireturn: | |
| 1740 case Bytecodes::_lreturn: case Bytecodes::_freturn: | |
| 1741 case Bytecodes::_dreturn: case Bytecodes::_areturn: | |
| 1742 case Bytecodes::_return: | |
| 1743 _successors = | |
| 1744 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1745 // No successors | |
| 1746 break; | |
| 1747 | |
| 1748 case Bytecodes::_ret: { | |
| 1749 _successors = | |
| 1750 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); | |
| 1751 | |
| 1752 Cell local = state->local(str->get_index()); | |
| 1753 ciType* return_address = state->type_at(local); | |
| 1754 assert(return_address->is_return_address(), "verify: wrong type"); | |
| 1755 int bci = return_address->as_return_address()->bci(); | |
| 1756 assert(_successors->length() == GOTO_TARGET, ""); | |
| 1757 _successors->append(analyzer->block_at(bci, jsrs)); | |
| 1758 break; | |
| 1759 } | |
| 1760 | |
| 1761 case Bytecodes::_wide: | |
| 1762 default: | |
| 1763 ShouldNotReachHere(); | |
| 1764 break; | |
| 1765 } | |
| 1766 } | |
| 1767 } | |
| 1768 return _successors; | |
| 1769 } | |
| 1770 | |
| 1771 // ------------------------------------------------------------------ | |
| 1772 // ciTypeFlow::Block:compute_exceptions | |
| 1773 // | |
| 1774 // Compute the exceptional successors and types for this Block. | |
| 1775 void ciTypeFlow::Block::compute_exceptions() { | |
| 1776 assert(_exceptions == NULL && _exc_klasses == NULL, "repeat"); | |
| 1777 | |
| 1778 if (CITraceTypeFlow) { | |
| 1779 tty->print(">> Computing exceptions for block "); | |
| 1780 print_value_on(tty); | |
| 1781 tty->cr(); | |
| 1782 } | |
| 1783 | |
| 1784 ciTypeFlow* analyzer = outer(); | |
| 1785 Arena* arena = analyzer->arena(); | |
| 1786 | |
| 1787 // Any bci in the block will do. | |
| 1788 ciExceptionHandlerStream str(analyzer->method(), start()); | |
| 1789 | |
| 1790 // Allocate our growable arrays. | |
| 1791 int exc_count = str.count(); | |
| 1792 _exceptions = new (arena) GrowableArray<Block*>(arena, exc_count, 0, NULL); | |
| 1793 _exc_klasses = new (arena) GrowableArray<ciInstanceKlass*>(arena, exc_count, | |
| 1794 0, NULL); | |
| 1795 | |
| 1796 for ( ; !str.is_done(); str.next()) { | |
| 1797 ciExceptionHandler* handler = str.handler(); | |
| 1798 int bci = handler->handler_bci(); | |
| 1799 ciInstanceKlass* klass = NULL; | |
| 1800 if (bci == -1) { | |
| 1801 // There is no catch all. It is possible to exit the method. | |
| 1802 break; | |
| 1803 } | |
| 1804 if (handler->is_catch_all()) { | |
| 1805 klass = analyzer->env()->Throwable_klass(); | |
| 1806 } else { | |
| 1807 klass = handler->catch_klass(); | |
| 1808 } | |
| 1809 _exceptions->append(analyzer->block_at(bci, _jsrs)); | |
| 1810 _exc_klasses->append(klass); | |
| 1811 } | |
| 1812 } | |
| 1813 | |
| 1814 // ------------------------------------------------------------------ | |
|
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1815 // ciTypeFlow::Block::set_backedge_copy |
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1816 // Use this only to make a pre-existing public block into a backedge copy. |
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1817 void ciTypeFlow::Block::set_backedge_copy(bool z) { |
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1818 assert(z || (z == is_backedge_copy()), "cannot make a backedge copy public"); |
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1819 _backedge_copy = z; |
| 0 | 1820 } |
| 1821 | |
| 1822 // ------------------------------------------------------------------ | |
|
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1823 // ciTypeFlow::Block::is_clonable_exit |
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1824 // |
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1825 // At most 2 normal successors, one of which continues looping, |
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1826 // and all exceptional successors must exit. |
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1827 bool ciTypeFlow::Block::is_clonable_exit(ciTypeFlow::Loop* lp) { |
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1828 int normal_cnt = 0; |
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1829 int in_loop_cnt = 0; |
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1830 for (SuccIter iter(this); !iter.done(); iter.next()) { |
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1831 Block* succ = iter.succ(); |
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1832 if (iter.is_normal_ctrl()) { |
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1833 if (++normal_cnt > 2) return false; |
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1834 if (lp->contains(succ->loop())) { |
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1835 if (++in_loop_cnt > 1) return false; |
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1836 } |
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1837 } else { |
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1838 if (lp->contains(succ->loop())) return false; |
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1839 } |
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1840 } |
|
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1841 return in_loop_cnt == 1; |
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1842 } |
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1843 |
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1844 // ------------------------------------------------------------------ |
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1845 // ciTypeFlow::Block::looping_succ |
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1846 // |
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1847 ciTypeFlow::Block* ciTypeFlow::Block::looping_succ(ciTypeFlow::Loop* lp) { |
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1848 assert(successors()->length() <= 2, "at most 2 normal successors"); |
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1849 for (SuccIter iter(this); !iter.done(); iter.next()) { |
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1850 Block* succ = iter.succ(); |
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1851 if (lp->contains(succ->loop())) { |
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1852 return succ; |
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1853 } |
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1854 } |
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1855 return NULL; |
| 0 | 1856 } |
| 1857 | |
| 1858 #ifndef PRODUCT | |
| 1859 // ------------------------------------------------------------------ | |
| 1860 // ciTypeFlow::Block::print_value_on | |
| 1861 void ciTypeFlow::Block::print_value_on(outputStream* st) const { | |
|
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1862 if (has_pre_order()) st->print("#%-2d ", pre_order()); |
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1863 if (has_rpo()) st->print("rpo#%-2d ", rpo()); |
| 0 | 1864 st->print("[%d - %d)", start(), limit()); |
|
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1865 if (is_loop_head()) st->print(" lphd"); |
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1866 if (is_irreducible_entry()) st->print(" irred"); |
| 0 | 1867 if (_jsrs->size() > 0) { st->print("/"); _jsrs->print_on(st); } |
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1868 if (is_backedge_copy()) st->print("/backedge_copy"); |
| 0 | 1869 } |
| 1870 | |
| 1871 // ------------------------------------------------------------------ | |
| 1872 // ciTypeFlow::Block::print_on | |
| 1873 void ciTypeFlow::Block::print_on(outputStream* st) const { | |
| 1874 if ((Verbose || WizardMode)) { | |
| 1875 outer()->method()->print_codes_on(start(), limit(), st); | |
| 1876 } | |
| 1877 st->print_cr(" ==================================================== "); | |
| 1878 st->print (" "); | |
| 1879 print_value_on(st); | |
|
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1880 st->print(" Stored locals: "); def_locals()->print_on(st, outer()->method()->max_locals()); tty->cr(); |
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1881 if (loop() && loop()->parent() != NULL) { |
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1882 st->print(" loops:"); |
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1883 Loop* lp = loop(); |
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1884 do { |
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1885 st->print(" %d<-%d", lp->head()->pre_order(),lp->tail()->pre_order()); |
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1886 if (lp->is_irreducible()) st->print("(ir)"); |
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1887 lp = lp->parent(); |
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1888 } while (lp->parent() != NULL); |
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1889 } |
| 0 | 1890 st->cr(); |
| 1891 _state->print_on(st); | |
| 1892 if (_successors == NULL) { | |
| 1893 st->print_cr(" No successor information"); | |
| 1894 } else { | |
| 1895 int num_successors = _successors->length(); | |
| 1896 st->print_cr(" Successors : %d", num_successors); | |
| 1897 for (int i = 0; i < num_successors; i++) { | |
| 1898 Block* successor = _successors->at(i); | |
| 1899 st->print(" "); | |
| 1900 successor->print_value_on(st); | |
| 1901 st->cr(); | |
| 1902 } | |
| 1903 } | |
| 1904 if (_exceptions == NULL) { | |
| 1905 st->print_cr(" No exception information"); | |
| 1906 } else { | |
| 1907 int num_exceptions = _exceptions->length(); | |
| 1908 st->print_cr(" Exceptions : %d", num_exceptions); | |
| 1909 for (int i = 0; i < num_exceptions; i++) { | |
| 1910 Block* exc_succ = _exceptions->at(i); | |
| 1911 ciInstanceKlass* exc_klass = _exc_klasses->at(i); | |
| 1912 st->print(" "); | |
| 1913 exc_succ->print_value_on(st); | |
| 1914 st->print(" -- "); | |
| 1915 exc_klass->name()->print_symbol_on(st); | |
| 1916 st->cr(); | |
| 1917 } | |
| 1918 } | |
| 1919 if (has_trap()) { | |
| 1920 st->print_cr(" Traps on %d with trap index %d", trap_bci(), trap_index()); | |
| 1921 } | |
| 1922 st->print_cr(" ==================================================== "); | |
| 1923 } | |
| 1924 #endif | |
| 1925 | |
|
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1926 #ifndef PRODUCT |
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1927 // ------------------------------------------------------------------ |
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1928 // ciTypeFlow::LocalSet::print_on |
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1929 void ciTypeFlow::LocalSet::print_on(outputStream* st, int limit) const { |
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1930 st->print("{"); |
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1931 for (int i = 0; i < max; i++) { |
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1932 if (test(i)) st->print(" %d", i); |
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1933 } |
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1934 if (limit > max) { |
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1935 st->print(" %d..%d ", max, limit); |
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1936 } |
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1937 st->print(" }"); |
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1938 } |
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1939 #endif |
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1940 |
| 0 | 1941 // ciTypeFlow |
| 1942 // | |
| 1943 // This is a pass over the bytecodes which computes the following: | |
| 1944 // basic block structure | |
| 1945 // interpreter type-states (a la the verifier) | |
| 1946 | |
| 1947 // ------------------------------------------------------------------ | |
| 1948 // ciTypeFlow::ciTypeFlow | |
| 1949 ciTypeFlow::ciTypeFlow(ciEnv* env, ciMethod* method, int osr_bci) { | |
| 1950 _env = env; | |
| 1951 _method = method; | |
| 1952 _methodBlocks = method->get_method_blocks(); | |
| 1953 _max_locals = method->max_locals(); | |
| 1954 _max_stack = method->max_stack(); | |
| 1955 _code_size = method->code_size(); | |
|
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1956 _has_irreducible_entry = false; |
| 0 | 1957 _osr_bci = osr_bci; |
| 1958 _failure_reason = NULL; | |
| 1846 | 1959 assert(0 <= start_bci() && start_bci() < code_size() , err_msg("correct osr_bci argument: 0 <= %d < %d", start_bci(), code_size())); |
| 0 | 1960 _work_list = NULL; |
| 1961 | |
| 1962 _ciblock_count = _methodBlocks->num_blocks(); | |
| 1963 _idx_to_blocklist = NEW_ARENA_ARRAY(arena(), GrowableArray<Block*>*, _ciblock_count); | |
| 1964 for (int i = 0; i < _ciblock_count; i++) { | |
| 1965 _idx_to_blocklist[i] = NULL; | |
| 1966 } | |
| 1967 _block_map = NULL; // until all blocks are seen | |
| 1968 _jsr_count = 0; | |
| 1969 _jsr_records = NULL; | |
| 1970 } | |
| 1971 | |
| 1972 // ------------------------------------------------------------------ | |
| 1973 // ciTypeFlow::work_list_next | |
| 1974 // | |
| 1975 // Get the next basic block from our work list. | |
| 1976 ciTypeFlow::Block* ciTypeFlow::work_list_next() { | |
| 1977 assert(!work_list_empty(), "work list must not be empty"); | |
| 1978 Block* next_block = _work_list; | |
| 1979 _work_list = next_block->next(); | |
| 1980 next_block->set_next(NULL); | |
| 1981 next_block->set_on_work_list(false); | |
| 1982 return next_block; | |
| 1983 } | |
| 1984 | |
| 1985 // ------------------------------------------------------------------ | |
| 1986 // ciTypeFlow::add_to_work_list | |
| 1987 // | |
| 1988 // Add a basic block to our work list. | |
|
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1989 // List is sorted by decreasing postorder sort (same as increasing RPO) |
| 0 | 1990 void ciTypeFlow::add_to_work_list(ciTypeFlow::Block* block) { |
| 1991 assert(!block->is_on_work_list(), "must not already be on work list"); | |
| 1992 | |
| 1993 if (CITraceTypeFlow) { | |
|
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1994 tty->print(">> Adding block "); |
| 0 | 1995 block->print_value_on(tty); |
| 1996 tty->print_cr(" to the work list : "); | |
| 1997 } | |
| 1998 | |
| 1999 block->set_on_work_list(true); | |
|
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2000 |
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2001 // decreasing post order sort |
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2002 |
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2003 Block* prev = NULL; |
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2004 Block* current = _work_list; |
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2005 int po = block->post_order(); |
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2006 while (current != NULL) { |
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2007 if (!current->has_post_order() || po > current->post_order()) |
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2008 break; |
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2009 prev = current; |
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2010 current = current->next(); |
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2011 } |
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2012 if (prev == NULL) { |
| 0 | 2013 block->set_next(_work_list); |
| 2014 _work_list = block; | |
| 2015 } else { | |
|
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2016 block->set_next(current); |
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2017 prev->set_next(block); |
| 0 | 2018 } |
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2019 |
| 0 | 2020 if (CITraceTypeFlow) { |
| 2021 tty->cr(); | |
| 2022 } | |
| 2023 } | |
| 2024 | |
| 2025 // ------------------------------------------------------------------ | |
| 2026 // ciTypeFlow::block_at | |
| 2027 // | |
| 2028 // Return the block beginning at bci which has a JsrSet compatible | |
| 2029 // with jsrs. | |
| 2030 ciTypeFlow::Block* ciTypeFlow::block_at(int bci, ciTypeFlow::JsrSet* jsrs, CreateOption option) { | |
| 2031 // First find the right ciBlock. | |
| 2032 if (CITraceTypeFlow) { | |
| 2033 tty->print(">> Requesting block for %d/", bci); | |
| 2034 jsrs->print_on(tty); | |
| 2035 tty->cr(); | |
| 2036 } | |
| 2037 | |
| 2038 ciBlock* ciblk = _methodBlocks->block_containing(bci); | |
| 2039 assert(ciblk->start_bci() == bci, "bad ciBlock boundaries"); | |
| 2040 Block* block = get_block_for(ciblk->index(), jsrs, option); | |
| 2041 | |
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2042 assert(block == NULL? (option == no_create): block->is_backedge_copy() == (option == create_backedge_copy), "create option consistent with result"); |
| 0 | 2043 |
| 2044 if (CITraceTypeFlow) { | |
| 2045 if (block != NULL) { | |
| 2046 tty->print(">> Found block "); | |
| 2047 block->print_value_on(tty); | |
| 2048 tty->cr(); | |
| 2049 } else { | |
| 2050 tty->print_cr(">> No such block."); | |
| 2051 } | |
| 2052 } | |
| 2053 | |
| 2054 return block; | |
| 2055 } | |
| 2056 | |
| 2057 // ------------------------------------------------------------------ | |
| 2058 // ciTypeFlow::make_jsr_record | |
| 2059 // | |
| 2060 // Make a JsrRecord for a given (entry, return) pair, if such a record | |
| 2061 // does not already exist. | |
| 2062 ciTypeFlow::JsrRecord* ciTypeFlow::make_jsr_record(int entry_address, | |
| 2063 int return_address) { | |
| 2064 if (_jsr_records == NULL) { | |
| 2065 _jsr_records = new (arena()) GrowableArray<JsrRecord*>(arena(), | |
| 2066 _jsr_count, | |
| 2067 0, | |
| 2068 NULL); | |
| 2069 } | |
| 2070 JsrRecord* record = NULL; | |
| 2071 int len = _jsr_records->length(); | |
| 2072 for (int i = 0; i < len; i++) { | |
| 2073 JsrRecord* record = _jsr_records->at(i); | |
| 2074 if (record->entry_address() == entry_address && | |
| 2075 record->return_address() == return_address) { | |
| 2076 return record; | |
| 2077 } | |
| 2078 } | |
| 2079 | |
| 2080 record = new (arena()) JsrRecord(entry_address, return_address); | |
| 2081 _jsr_records->append(record); | |
| 2082 return record; | |
| 2083 } | |
| 2084 | |
| 2085 // ------------------------------------------------------------------ | |
| 2086 // ciTypeFlow::flow_exceptions | |
| 2087 // | |
| 2088 // Merge the current state into all exceptional successors at the | |
| 2089 // current point in the code. | |
| 2090 void ciTypeFlow::flow_exceptions(GrowableArray<ciTypeFlow::Block*>* exceptions, | |
| 2091 GrowableArray<ciInstanceKlass*>* exc_klasses, | |
| 2092 ciTypeFlow::StateVector* state) { | |
| 2093 int len = exceptions->length(); | |
| 2094 assert(exc_klasses->length() == len, "must have same length"); | |
| 2095 for (int i = 0; i < len; i++) { | |
| 2096 Block* block = exceptions->at(i); | |
| 2097 ciInstanceKlass* exception_klass = exc_klasses->at(i); | |
| 2098 | |
| 2099 if (!exception_klass->is_loaded()) { | |
| 2100 // Do not compile any code for unloaded exception types. | |
| 2101 // Following compiler passes are responsible for doing this also. | |
| 2102 continue; | |
| 2103 } | |
| 2104 | |
| 2105 if (block->meet_exception(exception_klass, state)) { | |
|
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2106 // Block was modified and has PO. Add it to the work list. |
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2107 if (block->has_post_order() && |
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2108 !block->is_on_work_list()) { |
| 0 | 2109 add_to_work_list(block); |
| 2110 } | |
| 2111 } | |
| 2112 } | |
| 2113 } | |
| 2114 | |
| 2115 // ------------------------------------------------------------------ | |
| 2116 // ciTypeFlow::flow_successors | |
| 2117 // | |
| 2118 // Merge the current state into all successors at the current point | |
| 2119 // in the code. | |
| 2120 void ciTypeFlow::flow_successors(GrowableArray<ciTypeFlow::Block*>* successors, | |
| 2121 ciTypeFlow::StateVector* state) { | |
| 2122 int len = successors->length(); | |
| 2123 for (int i = 0; i < len; i++) { | |
| 2124 Block* block = successors->at(i); | |
| 2125 if (block->meet(state)) { | |
|
367
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2126 // Block was modified and has PO. Add it to the work list. |
|
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2127 if (block->has_post_order() && |
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|
2128 !block->is_on_work_list()) { |
| 0 | 2129 add_to_work_list(block); |
| 2130 } | |
| 2131 } | |
| 2132 } | |
| 2133 } | |
| 2134 | |
| 2135 // ------------------------------------------------------------------ | |
| 2136 // ciTypeFlow::can_trap | |
| 2137 // | |
| 2138 // Tells if a given instruction is able to generate an exception edge. | |
| 2139 bool ciTypeFlow::can_trap(ciBytecodeStream& str) { | |
| 2140 // Cf. GenerateOopMap::do_exception_edge. | |
| 2141 if (!Bytecodes::can_trap(str.cur_bc())) return false; | |
| 2142 | |
| 2143 switch (str.cur_bc()) { | |
| 1565 | 2144 // %%% FIXME: ldc of Class can generate an exception |
| 0 | 2145 case Bytecodes::_ldc: |
| 2146 case Bytecodes::_ldc_w: | |
| 2147 case Bytecodes::_ldc2_w: | |
| 2148 case Bytecodes::_aload_0: | |
| 2149 // These bytecodes can trap for rewriting. We need to assume that | |
| 2150 // they do not throw exceptions to make the monitor analysis work. | |
| 2151 return false; | |
| 2152 | |
| 2153 case Bytecodes::_ireturn: | |
| 2154 case Bytecodes::_lreturn: | |
| 2155 case Bytecodes::_freturn: | |
| 2156 case Bytecodes::_dreturn: | |
| 2157 case Bytecodes::_areturn: | |
| 2158 case Bytecodes::_return: | |
| 2159 // We can assume the monitor stack is empty in this analysis. | |
| 2160 return false; | |
| 2161 | |
| 2162 case Bytecodes::_monitorexit: | |
| 2163 // We can assume monitors are matched in this analysis. | |
| 2164 return false; | |
| 2165 } | |
| 2166 | |
| 2167 return true; | |
| 2168 } | |
| 2169 | |
|
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2170 // ------------------------------------------------------------------ |
|
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2171 // ciTypeFlow::clone_loop_heads |
|
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2172 // |
|
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2173 // Clone the loop heads |
|
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2174 bool ciTypeFlow::clone_loop_heads(Loop* lp, StateVector* temp_vector, JsrSet* temp_set) { |
|
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2175 bool rslt = false; |
|
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2176 for (PreorderLoops iter(loop_tree_root()); !iter.done(); iter.next()) { |
|
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2177 lp = iter.current(); |
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2178 Block* head = lp->head(); |
|
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2179 if (lp == loop_tree_root() || |
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2180 lp->is_irreducible() || |
|
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2181 !head->is_clonable_exit(lp)) |
|
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2182 continue; |
|
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2183 |
|
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2184 // check not already cloned |
|
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2185 if (head->backedge_copy_count() != 0) |
|
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2186 continue; |
|
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2187 |
|
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|
2188 // check _no_ shared head below us |
|
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2189 Loop* ch; |
|
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2190 for (ch = lp->child(); ch != NULL && ch->head() != head; ch = ch->sibling()); |
|
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2191 if (ch != NULL) |
|
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|
2192 continue; |
|
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|
2193 |
|
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|
2194 // Clone head |
|
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2195 Block* new_head = head->looping_succ(lp); |
|
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2196 Block* clone = clone_loop_head(lp, temp_vector, temp_set); |
|
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2197 // Update lp's info |
|
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2198 clone->set_loop(lp); |
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2199 lp->set_head(new_head); |
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2200 lp->set_tail(clone); |
|
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2201 // And move original head into outer loop |
|
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2202 head->set_loop(lp->parent()); |
|
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2203 |
|
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|
2204 rslt = true; |
|
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2205 } |
|
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|
2206 return rslt; |
|
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|
2207 } |
|
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|
2208 |
|
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|
2209 // ------------------------------------------------------------------ |
|
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|
2210 // ciTypeFlow::clone_loop_head |
|
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|
2211 // |
|
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2212 // Clone lp's head and replace tail's successors with clone. |
|
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2213 // |
|
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2214 // | |
|
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2215 // v |
|
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2216 // head <-> body |
|
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2217 // | |
|
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2218 // v |
|
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|
2219 // exit |
|
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|
2220 // |
|
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|
2221 // new_head |
|
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|
2222 // |
|
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2223 // | |
|
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2224 // v |
|
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|
2225 // head ----------\ |
|
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|
2226 // | | |
|
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|
2227 // | v |
|
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|
2228 // | clone <-> body |
|
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|
2229 // | | |
|
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|
2230 // | /--/ |
|
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|
2231 // | | |
|
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|
2232 // v v |
|
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|
2233 // exit |
|
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|
2234 // |
|
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|
2235 ciTypeFlow::Block* ciTypeFlow::clone_loop_head(Loop* lp, StateVector* temp_vector, JsrSet* temp_set) { |
|
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|
2236 Block* head = lp->head(); |
|
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|
2237 Block* tail = lp->tail(); |
|
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|
2238 if (CITraceTypeFlow) { |
|
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|
2239 tty->print(">> Requesting clone of loop head "); head->print_value_on(tty); |
|
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|
2240 tty->print(" for predecessor "); tail->print_value_on(tty); |
|
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|
2241 tty->cr(); |
|
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|
2242 } |
|
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|
2243 Block* clone = block_at(head->start(), head->jsrs(), create_backedge_copy); |
|
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|
2244 assert(clone->backedge_copy_count() == 1, "one backedge copy for all back edges"); |
|
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|
2245 |
|
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|
2246 assert(!clone->has_pre_order(), "just created"); |
|
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|
2247 clone->set_next_pre_order(); |
|
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|
2248 |
|
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|
2249 // Insert clone after (orig) tail in reverse post order |
|
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|
2250 clone->set_rpo_next(tail->rpo_next()); |
|
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|
2251 tail->set_rpo_next(clone); |
|
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|
2252 |
|
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|
2253 // tail->head becomes tail->clone |
|
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|
2254 for (SuccIter iter(tail); !iter.done(); iter.next()) { |
|
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|
2255 if (iter.succ() == head) { |
|
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|
2256 iter.set_succ(clone); |
|
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|
2257 } |
|
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|
2258 } |
|
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|
2259 flow_block(tail, temp_vector, temp_set); |
|
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|
2260 if (head == tail) { |
|
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|
2261 // For self-loops, clone->head becomes clone->clone |
|
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|
2262 flow_block(clone, temp_vector, temp_set); |
|
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|
2263 for (SuccIter iter(clone); !iter.done(); iter.next()) { |
|
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|
2264 if (iter.succ() == head) { |
|
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|
2265 iter.set_succ(clone); |
|
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|
2266 break; |
|
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|
2267 } |
|
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|
2268 } |
|
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|
2269 } |
|
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|
2270 flow_block(clone, temp_vector, temp_set); |
|
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|
2271 |
|
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|
2272 return clone; |
|
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|
2273 } |
| 0 | 2274 |
| 2275 // ------------------------------------------------------------------ | |
| 2276 // ciTypeFlow::flow_block | |
| 2277 // | |
| 2278 // Interpret the effects of the bytecodes on the incoming state | |
| 2279 // vector of a basic block. Push the changed state to succeeding | |
| 2280 // basic blocks. | |
| 2281 void ciTypeFlow::flow_block(ciTypeFlow::Block* block, | |
| 2282 ciTypeFlow::StateVector* state, | |
| 2283 ciTypeFlow::JsrSet* jsrs) { | |
| 2284 if (CITraceTypeFlow) { | |
| 2285 tty->print("\n>> ANALYZING BLOCK : "); | |
| 2286 tty->cr(); | |
| 2287 block->print_on(tty); | |
| 2288 } | |
| 2289 assert(block->has_pre_order(), "pre-order is assigned before 1st flow"); | |
| 2290 | |
| 2291 int start = block->start(); | |
| 2292 int limit = block->limit(); | |
| 2293 int control = block->control(); | |
| 2294 if (control != ciBlock::fall_through_bci) { | |
| 2295 limit = control; | |
| 2296 } | |
| 2297 | |
| 2298 // Grab the state from the current block. | |
| 2299 block->copy_state_into(state); | |
|
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2300 state->def_locals()->clear(); |
| 0 | 2301 |
| 2302 GrowableArray<Block*>* exceptions = block->exceptions(); | |
| 2303 GrowableArray<ciInstanceKlass*>* exc_klasses = block->exc_klasses(); | |
| 2304 bool has_exceptions = exceptions->length() > 0; | |
| 2305 | |
|
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2306 bool exceptions_used = false; |
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2307 |
| 0 | 2308 ciBytecodeStream str(method()); |
| 2309 str.reset_to_bci(start); | |
| 2310 Bytecodes::Code code; | |
| 2311 while ((code = str.next()) != ciBytecodeStream::EOBC() && | |
| 2312 str.cur_bci() < limit) { | |
| 2313 // Check for exceptional control flow from this point. | |
| 2314 if (has_exceptions && can_trap(str)) { | |
| 2315 flow_exceptions(exceptions, exc_klasses, state); | |
|
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2316 exceptions_used = true; |
| 0 | 2317 } |
| 2318 // Apply the effects of the current bytecode to our state. | |
| 2319 bool res = state->apply_one_bytecode(&str); | |
| 2320 | |
| 2321 // Watch for bailouts. | |
| 2322 if (failing()) return; | |
| 2323 | |
| 2324 if (res) { | |
| 2325 | |
| 2326 // We have encountered a trap. Record it in this block. | |
| 2327 block->set_trap(state->trap_bci(), state->trap_index()); | |
| 2328 | |
| 2329 if (CITraceTypeFlow) { | |
| 2330 tty->print_cr(">> Found trap"); | |
| 2331 block->print_on(tty); | |
| 2332 } | |
| 2333 | |
|
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2334 // Save set of locals defined in this block |
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2335 block->def_locals()->add(state->def_locals()); |
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2336 |
| 0 | 2337 // Record (no) successors. |
| 2338 block->successors(&str, state, jsrs); | |
| 2339 | |
|
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2340 assert(!has_exceptions || exceptions_used, "Not removing exceptions"); |
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2341 |
| 0 | 2342 // Discontinue interpretation of this Block. |
| 2343 return; | |
| 2344 } | |
| 2345 } | |
| 2346 | |
| 2347 GrowableArray<Block*>* successors = NULL; | |
| 2348 if (control != ciBlock::fall_through_bci) { | |
| 2349 // Check for exceptional control flow from this point. | |
| 2350 if (has_exceptions && can_trap(str)) { | |
| 2351 flow_exceptions(exceptions, exc_klasses, state); | |
|
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2352 exceptions_used = true; |
| 0 | 2353 } |
| 2354 | |
| 2355 // Fix the JsrSet to reflect effect of the bytecode. | |
| 2356 block->copy_jsrs_into(jsrs); | |
| 2357 jsrs->apply_control(this, &str, state); | |
| 2358 | |
| 2359 // Find successor edges based on old state and new JsrSet. | |
| 2360 successors = block->successors(&str, state, jsrs); | |
| 2361 | |
| 2362 // Apply the control changes to the state. | |
| 2363 state->apply_one_bytecode(&str); | |
| 2364 } else { | |
| 2365 // Fall through control | |
| 2366 successors = block->successors(&str, NULL, NULL); | |
| 2367 } | |
| 2368 | |
|
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2369 // Save set of locals defined in this block |
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2370 block->def_locals()->add(state->def_locals()); |
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2371 |
|
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2372 // Remove untaken exception paths |
|
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2373 if (!exceptions_used) |
|
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|
2374 exceptions->clear(); |
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2375 |
| 0 | 2376 // Pass our state to successors. |
| 2377 flow_successors(successors, state); | |
| 2378 } | |
| 2379 | |
| 2380 // ------------------------------------------------------------------ | |
|
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|
2381 // ciTypeFlow::PostOrderLoops::next |
|
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2382 // |
|
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|
2383 // Advance to next loop tree using a postorder, left-to-right traversal. |
|
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2384 void ciTypeFlow::PostorderLoops::next() { |
|
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2385 assert(!done(), "must not be done."); |
|
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2386 if (_current->sibling() != NULL) { |
|
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2387 _current = _current->sibling(); |
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2388 while (_current->child() != NULL) { |
|
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2389 _current = _current->child(); |
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2390 } |
|
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2391 } else { |
|
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2392 _current = _current->parent(); |
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2393 } |
|
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|
2394 } |
|
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|
2395 |
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2396 // ------------------------------------------------------------------ |
|
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2397 // ciTypeFlow::PreOrderLoops::next |
|
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2398 // |
|
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2399 // Advance to next loop tree using a preorder, left-to-right traversal. |
|
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2400 void ciTypeFlow::PreorderLoops::next() { |
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2401 assert(!done(), "must not be done."); |
|
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2402 if (_current->child() != NULL) { |
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2403 _current = _current->child(); |
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2404 } else if (_current->sibling() != NULL) { |
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|
2405 _current = _current->sibling(); |
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|
2406 } else { |
|
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2407 while (_current != _root && _current->sibling() == NULL) { |
|
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2408 _current = _current->parent(); |
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|
2409 } |
|
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2410 if (_current == _root) { |
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2411 _current = NULL; |
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|
2412 assert(done(), "must be done."); |
|
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|
2413 } else { |
|
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|
2414 assert(_current->sibling() != NULL, "must be more to do"); |
|
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2415 _current = _current->sibling(); |
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|
2416 } |
|
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|
2417 } |
|
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|
2418 } |
|
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|
2419 |
|
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|
2420 // ------------------------------------------------------------------ |
|
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|
2421 // ciTypeFlow::Loop::sorted_merge |
|
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|
2422 // |
|
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|
2423 // Merge the branch lp into this branch, sorting on the loop head |
|
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2424 // pre_orders. Returns the leaf of the merged branch. |
|
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2425 // Child and sibling pointers will be setup later. |
|
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2426 // Sort is (looking from leaf towards the root) |
|
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2427 // descending on primary key: loop head's pre_order, and |
|
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2428 // ascending on secondary key: loop tail's pre_order. |
|
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2429 ciTypeFlow::Loop* ciTypeFlow::Loop::sorted_merge(Loop* lp) { |
|
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|
2430 Loop* leaf = this; |
|
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2431 Loop* prev = NULL; |
|
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2432 Loop* current = leaf; |
|
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2433 while (lp != NULL) { |
|
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2434 int lp_pre_order = lp->head()->pre_order(); |
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|
2435 // Find insertion point for "lp" |
|
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2436 while (current != NULL) { |
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2437 if (current == lp) |
|
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2438 return leaf; // Already in list |
|
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|
2439 if (current->head()->pre_order() < lp_pre_order) |
|
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|
2440 break; |
|
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|
2441 if (current->head()->pre_order() == lp_pre_order && |
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|
2442 current->tail()->pre_order() > lp->tail()->pre_order()) { |
|
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|
2443 break; |
|
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|
2444 } |
|
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|
2445 prev = current; |
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|
2446 current = current->parent(); |
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|
2447 } |
|
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|
2448 Loop* next_lp = lp->parent(); // Save future list of items to insert |
|
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|
2449 // Insert lp before current |
|
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|
2450 lp->set_parent(current); |
|
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|
2451 if (prev != NULL) { |
|
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|
2452 prev->set_parent(lp); |
|
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|
2453 } else { |
|
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|
2454 leaf = lp; |
|
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|
2455 } |
|
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|
2456 prev = lp; // Inserted item is new prev[ious] |
|
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|
2457 lp = next_lp; // Next item to insert |
|
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|
2458 } |
|
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|
2459 return leaf; |
|
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|
2460 } |
|
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|
2461 |
|
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|
2462 // ------------------------------------------------------------------ |
|
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|
2463 // ciTypeFlow::build_loop_tree |
|
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|
2464 // |
|
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|
2465 // Incrementally build loop tree. |
|
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|
2466 void ciTypeFlow::build_loop_tree(Block* blk) { |
|
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|
2467 assert(!blk->is_post_visited(), "precondition"); |
|
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|
2468 Loop* innermost = NULL; // merge of loop tree branches over all successors |
|
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|
2469 |
|
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|
2470 for (SuccIter iter(blk); !iter.done(); iter.next()) { |
|
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|
2471 Loop* lp = NULL; |
|
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|
2472 Block* succ = iter.succ(); |
|
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|
2473 if (!succ->is_post_visited()) { |
|
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|
2474 // Found backedge since predecessor post visited, but successor is not |
|
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|
2475 assert(succ->pre_order() <= blk->pre_order(), "should be backedge"); |
|
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|
2476 |
|
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|
2477 // Create a LoopNode to mark this loop. |
|
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|
2478 lp = new (arena()) Loop(succ, blk); |
|
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|
2479 if (succ->loop() == NULL) |
|
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|
2480 succ->set_loop(lp); |
|
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|
2481 // succ->loop will be updated to innermost loop on a later call, when blk==succ |
|
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|
2482 |
|
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|
2483 } else { // Nested loop |
|
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|
2484 lp = succ->loop(); |
|
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|
2485 |
|
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|
2486 // If succ is loop head, find outer loop. |
|
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|
2487 while (lp != NULL && lp->head() == succ) { |
|
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|
2488 lp = lp->parent(); |
|
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|
2489 } |
|
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|
2490 if (lp == NULL) { |
|
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|
2491 // Infinite loop, it's parent is the root |
|
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|
2492 lp = loop_tree_root(); |
|
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|
2493 } |
|
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0
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|
2494 } |
|
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0
diff
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|
2495 |
|
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0
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|
2496 // Check for irreducible loop. |
|
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|
2497 // Successor has already been visited. If the successor's loop head |
|
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|
2498 // has already been post-visited, then this is another entry into the loop. |
|
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|
2499 while (lp->head()->is_post_visited() && lp != loop_tree_root()) { |
|
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|
2500 _has_irreducible_entry = true; |
|
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diff
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|
2501 lp->set_irreducible(succ); |
|
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|
2502 if (!succ->is_on_work_list()) { |
|
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|
2503 // Assume irreducible entries need more data flow |
|
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|
2504 add_to_work_list(succ); |
|
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|
2505 } |
| 991 | 2506 Loop* plp = lp->parent(); |
| 2507 if (plp == NULL) { | |
| 2508 // This only happens for some irreducible cases. The parent | |
| 2509 // will be updated during a later pass. | |
| 2510 break; | |
| 2511 } | |
| 2512 lp = plp; | |
|
367
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|
2513 } |
|
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|
2514 |
|
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diff
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|
2515 // Merge loop tree branch for all successors. |
|
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|
2516 innermost = innermost == NULL ? lp : innermost->sorted_merge(lp); |
|
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|
2517 |
|
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|
2518 } // end loop |
|
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diff
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|
2519 |
|
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diff
changeset
|
2520 if (innermost == NULL) { |
|
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|
2521 assert(blk->successors()->length() == 0, "CFG exit"); |
|
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|
2522 blk->set_loop(loop_tree_root()); |
|
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|
2523 } else if (innermost->head() == blk) { |
|
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|
2524 // If loop header, complete the tree pointers |
|
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|
2525 if (blk->loop() != innermost) { |
|
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0
diff
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|
2526 #if ASSERT |
|
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|
2527 assert(blk->loop()->head() == innermost->head(), "same head"); |
|
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|
2528 Loop* dl; |
|
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|
2529 for (dl = innermost; dl != NULL && dl != blk->loop(); dl = dl->parent()); |
|
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|
2530 assert(dl == blk->loop(), "blk->loop() already in innermost list"); |
|
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0
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|
2531 #endif |
|
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|
2532 blk->set_loop(innermost); |
|
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0
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|
2533 } |
|
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diff
changeset
|
2534 innermost->def_locals()->add(blk->def_locals()); |
|
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changeset
|
2535 Loop* l = innermost; |
|
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diff
changeset
|
2536 Loop* p = l->parent(); |
|
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diff
changeset
|
2537 while (p && l->head() == blk) { |
|
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0
diff
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|
2538 l->set_sibling(p->child()); // Put self on parents 'next child' |
|
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changeset
|
2539 p->set_child(l); // Make self the first child of parent |
|
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|
2540 p->def_locals()->add(l->def_locals()); |
|
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diff
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|
2541 l = p; // Walk up the parent chain |
|
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0
diff
changeset
|
2542 p = l->parent(); |
|
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0
diff
changeset
|
2543 } |
|
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parents:
0
diff
changeset
|
2544 } else { |
|
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parents:
0
diff
changeset
|
2545 blk->set_loop(innermost); |
|
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0
diff
changeset
|
2546 innermost->def_locals()->add(blk->def_locals()); |
|
194b8e3a2fc4
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0
diff
changeset
|
2547 } |
|
194b8e3a2fc4
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0
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changeset
|
2548 } |
|
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parents:
0
diff
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|
2549 |
|
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0
diff
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|
2550 // ------------------------------------------------------------------ |
|
194b8e3a2fc4
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0
diff
changeset
|
2551 // ciTypeFlow::Loop::contains |
|
194b8e3a2fc4
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0
diff
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|
2552 // |
|
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0
diff
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|
2553 // Returns true if lp is nested loop. |
|
194b8e3a2fc4
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0
diff
changeset
|
2554 bool ciTypeFlow::Loop::contains(ciTypeFlow::Loop* lp) const { |
|
194b8e3a2fc4
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0
diff
changeset
|
2555 assert(lp != NULL, ""); |
|
194b8e3a2fc4
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0
diff
changeset
|
2556 if (this == lp || head() == lp->head()) return true; |
|
194b8e3a2fc4
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0
diff
changeset
|
2557 int depth1 = depth(); |
|
194b8e3a2fc4
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0
diff
changeset
|
2558 int depth2 = lp->depth(); |
|
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0
diff
changeset
|
2559 if (depth1 > depth2) |
|
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0
diff
changeset
|
2560 return false; |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2561 while (depth1 < depth2) { |
|
194b8e3a2fc4
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0
diff
changeset
|
2562 depth2--; |
|
194b8e3a2fc4
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0
diff
changeset
|
2563 lp = lp->parent(); |
|
194b8e3a2fc4
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0
diff
changeset
|
2564 } |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2565 return this == lp; |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2566 } |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2567 |
|
194b8e3a2fc4
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0
diff
changeset
|
2568 // ------------------------------------------------------------------ |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2569 // ciTypeFlow::Loop::depth |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2570 // |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2571 // Loop depth |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2572 int ciTypeFlow::Loop::depth() const { |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2573 int dp = 0; |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2574 for (Loop* lp = this->parent(); lp != NULL; lp = lp->parent()) |
|
194b8e3a2fc4
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0
diff
changeset
|
2575 dp++; |
|
194b8e3a2fc4
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0
diff
changeset
|
2576 return dp; |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2577 } |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2578 |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2579 #ifndef PRODUCT |
|
194b8e3a2fc4
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parents:
0
diff
changeset
|
2580 // ------------------------------------------------------------------ |
|
194b8e3a2fc4
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0
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|
2581 // ciTypeFlow::Loop::print |
|
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|
2582 void ciTypeFlow::Loop::print(outputStream* st, int indent) const { |
|
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2583 for (int i = 0; i < indent; i++) st->print(" "); |
|
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|
2584 st->print("%d<-%d %s", |
|
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|
2585 is_root() ? 0 : this->head()->pre_order(), |
|
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|
2586 is_root() ? 0 : this->tail()->pre_order(), |
|
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|
2587 is_irreducible()?" irr":""); |
|
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|
2588 st->print(" defs: "); |
|
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|
2589 def_locals()->print_on(st, _head->outer()->method()->max_locals()); |
|
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|
2590 st->cr(); |
|
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|
2591 for (Loop* ch = child(); ch != NULL; ch = ch->sibling()) |
|
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|
2592 ch->print(st, indent+2); |
|
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|
2593 } |
|
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|
2594 #endif |
|
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|
2595 |
|
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|
2596 // ------------------------------------------------------------------ |
|
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|
2597 // ciTypeFlow::df_flow_types |
|
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2598 // |
|
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|
2599 // Perform the depth first type flow analysis. Helper for flow_types. |
|
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|
2600 void ciTypeFlow::df_flow_types(Block* start, |
|
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|
2601 bool do_flow, |
|
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|
2602 StateVector* temp_vector, |
|
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|
2603 JsrSet* temp_set) { |
|
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|
2604 int dft_len = 100; |
| 1685 | 2605 GrowableArray<Block*> stk(dft_len); |
|
367
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2606 |
|
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|
2607 ciBlock* dummy = _methodBlocks->make_dummy_block(); |
|
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|
2608 JsrSet* root_set = new JsrSet(NULL, 0); |
|
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|
2609 Block* root_head = new (arena()) Block(this, dummy, root_set); |
|
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2610 Block* root_tail = new (arena()) Block(this, dummy, root_set); |
|
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|
2611 root_head->set_pre_order(0); |
|
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|
2612 root_head->set_post_order(0); |
|
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|
2613 root_tail->set_pre_order(max_jint); |
|
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|
2614 root_tail->set_post_order(max_jint); |
|
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|
2615 set_loop_tree_root(new (arena()) Loop(root_head, root_tail)); |
|
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|
2616 |
|
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|
2617 stk.push(start); |
|
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|
2618 |
|
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|
2619 _next_pre_order = 0; // initialize pre_order counter |
|
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|
2620 _rpo_list = NULL; |
|
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|
2621 int next_po = 0; // initialize post_order counter |
|
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|
2622 |
|
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|
2623 // Compute RPO and the control flow graph |
|
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|
2624 int size; |
|
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2625 while ((size = stk.length()) > 0) { |
|
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|
2626 Block* blk = stk.top(); // Leave node on stack |
|
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|
2627 if (!blk->is_visited()) { |
|
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|
2628 // forward arc in graph |
|
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|
2629 assert (!blk->has_pre_order(), ""); |
|
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|
2630 blk->set_next_pre_order(); |
|
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|
2631 |
|
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|
2632 if (_next_pre_order >= MaxNodeLimit / 2) { |
|
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|
2633 // Too many basic blocks. Bail out. |
|
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|
2634 // This can happen when try/finally constructs are nested to depth N, |
|
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|
2635 // and there is O(2**N) cloning of jsr bodies. See bug 4697245! |
|
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|
2636 // "MaxNodeLimit / 2" is used because probably the parser will |
|
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|
2637 // generate at least twice that many nodes and bail out. |
|
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|
2638 record_failure("too many basic blocks"); |
|
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|
2639 return; |
|
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|
2640 } |
|
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|
2641 if (do_flow) { |
|
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|
2642 flow_block(blk, temp_vector, temp_set); |
|
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|
2643 if (failing()) return; // Watch for bailouts. |
|
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|
2644 } |
|
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|
2645 } else if (!blk->is_post_visited()) { |
|
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|
2646 // cross or back arc |
|
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|
2647 for (SuccIter iter(blk); !iter.done(); iter.next()) { |
|
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|
2648 Block* succ = iter.succ(); |
|
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|
2649 if (!succ->is_visited()) { |
|
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|
2650 stk.push(succ); |
|
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|
2651 } |
|
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|
2652 } |
|
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|
2653 if (stk.length() == size) { |
|
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|
2654 // There were no additional children, post visit node now |
|
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|
2655 stk.pop(); // Remove node from stack |
|
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|
2656 |
|
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|
2657 build_loop_tree(blk); |
|
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|
2658 blk->set_post_order(next_po++); // Assign post order |
|
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|
2659 prepend_to_rpo_list(blk); |
|
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|
2660 assert(blk->is_post_visited(), ""); |
|
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|
2661 |
|
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|
2662 if (blk->is_loop_head() && !blk->is_on_work_list()) { |
|
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|
2663 // Assume loop heads need more data flow |
|
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|
2664 add_to_work_list(blk); |
|
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|
2665 } |
|
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|
2666 } |
|
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|
2667 } else { |
|
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|
2668 stk.pop(); // Remove post-visited node from stack |
|
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|
2669 } |
|
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|
2670 } |
|
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|
2671 } |
|
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|
2672 |
|
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|
2673 // ------------------------------------------------------------------ |
| 0 | 2674 // ciTypeFlow::flow_types |
| 2675 // | |
| 2676 // Perform the type flow analysis, creating and cloning Blocks as | |
| 2677 // necessary. | |
| 2678 void ciTypeFlow::flow_types() { | |
| 2679 ResourceMark rm; | |
| 2680 StateVector* temp_vector = new StateVector(this); | |
| 2681 JsrSet* temp_set = new JsrSet(NULL, 16); | |
| 2682 | |
| 2683 // Create the method entry block. | |
|
367
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|
2684 Block* start = block_at(start_bci(), temp_set); |
| 0 | 2685 |
| 2686 // Load the initial state into it. | |
| 2687 const StateVector* start_state = get_start_state(); | |
| 2688 if (failing()) return; | |
|
367
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|
2689 start->meet(start_state); |
|
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|
2690 |
|
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|
2691 // Depth first visit |
|
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|
2692 df_flow_types(start, true /*do flow*/, temp_vector, temp_set); |
| 0 | 2693 |
|
367
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|
2694 if (failing()) return; |
|
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|
2695 assert(_rpo_list == start, "must be start"); |
| 0 | 2696 |
|
367
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|
2697 // Any loops found? |
|
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|
2698 if (loop_tree_root()->child() != NULL && |
|
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|
2699 env()->comp_level() >= CompLevel_full_optimization) { |
|
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|
2700 // Loop optimizations are not performed on Tier1 compiles. |
|
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|
2701 |
|
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|
2702 bool changed = clone_loop_heads(loop_tree_root(), temp_vector, temp_set); |
| 0 | 2703 |
|
367
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|
2704 // If some loop heads were cloned, recompute postorder and loop tree |
|
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|
2705 if (changed) { |
|
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|
2706 loop_tree_root()->set_child(NULL); |
|
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|
2707 for (Block* blk = _rpo_list; blk != NULL;) { |
|
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2708 Block* next = blk->rpo_next(); |
|
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2709 blk->df_init(); |
|
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2710 blk = next; |
|
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2711 } |
|
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|
2712 df_flow_types(start, false /*no flow*/, temp_vector, temp_set); |
|
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|
2713 } |
|
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|
2714 } |
| 0 | 2715 |
|
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2716 if (CITraceTypeFlow) { |
|
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2717 tty->print_cr("\nLoop tree"); |
|
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2718 loop_tree_root()->print(); |
|
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|
2719 } |
|
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|
2720 |
|
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2721 // Continue flow analysis until fixed point reached |
|
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|
2722 |
|
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2723 debug_only(int max_block = _next_pre_order;) |
| 0 | 2724 |
|
367
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2725 while (!work_list_empty()) { |
|
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2726 Block* blk = work_list_next(); |
|
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2727 assert (blk->has_post_order(), "post order assigned above"); |
|
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2728 |
|
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|
2729 flow_block(blk, temp_vector, temp_set); |
|
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|
2730 |
|
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2731 assert (max_block == _next_pre_order, "no new blocks"); |
|
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|
2732 assert (!failing(), "no more bailouts"); |
| 0 | 2733 } |
| 2734 } | |
| 2735 | |
| 2736 // ------------------------------------------------------------------ | |
| 2737 // ciTypeFlow::map_blocks | |
| 2738 // | |
|
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2739 // Create the block map, which indexes blocks in reverse post-order. |
| 0 | 2740 void ciTypeFlow::map_blocks() { |
| 2741 assert(_block_map == NULL, "single initialization"); | |
|
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2742 int block_ct = _next_pre_order; |
|
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2743 _block_map = NEW_ARENA_ARRAY(arena(), Block*, block_ct); |
|
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2744 assert(block_ct == block_count(), ""); |
|
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|
2745 |
|
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2746 Block* blk = _rpo_list; |
|
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2747 for (int m = 0; m < block_ct; m++) { |
|
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2748 int rpo = blk->rpo(); |
|
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2749 assert(rpo == m, "should be sequential"); |
|
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2750 _block_map[rpo] = blk; |
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2751 blk = blk->rpo_next(); |
| 0 | 2752 } |
|
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2753 assert(blk == NULL, "should be done"); |
|
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2754 |
|
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2755 for (int j = 0; j < block_ct; j++) { |
|
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2756 assert(_block_map[j] != NULL, "must not drop any blocks"); |
|
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2757 Block* block = _block_map[j]; |
| 0 | 2758 // Remove dead blocks from successor lists: |
| 2759 for (int e = 0; e <= 1; e++) { | |
| 2760 GrowableArray<Block*>* l = e? block->exceptions(): block->successors(); | |
|
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2761 for (int k = 0; k < l->length(); k++) { |
|
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|
2762 Block* s = l->at(k); |
|
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2763 if (!s->has_post_order()) { |
| 0 | 2764 if (CITraceTypeFlow) { |
| 2765 tty->print("Removing dead %s successor of #%d: ", (e? "exceptional": "normal"), block->pre_order()); | |
| 2766 s->print_value_on(tty); | |
| 2767 tty->cr(); | |
| 2768 } | |
| 2769 l->remove(s); | |
|
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|
2770 --k; |
| 0 | 2771 } |
| 2772 } | |
| 2773 } | |
| 2774 } | |
| 2775 } | |
| 2776 | |
| 2777 // ------------------------------------------------------------------ | |
| 2778 // ciTypeFlow::get_block_for | |
| 2779 // | |
| 2780 // Find a block with this ciBlock which has a compatible JsrSet. | |
| 2781 // If no such block exists, create it, unless the option is no_create. | |
|
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|
2782 // If the option is create_backedge_copy, always create a fresh backedge copy. |
| 0 | 2783 ciTypeFlow::Block* ciTypeFlow::get_block_for(int ciBlockIndex, ciTypeFlow::JsrSet* jsrs, CreateOption option) { |
| 2784 Arena* a = arena(); | |
| 2785 GrowableArray<Block*>* blocks = _idx_to_blocklist[ciBlockIndex]; | |
| 2786 if (blocks == NULL) { | |
| 2787 // Query only? | |
| 2788 if (option == no_create) return NULL; | |
| 2789 | |
| 2790 // Allocate the growable array. | |
| 2791 blocks = new (a) GrowableArray<Block*>(a, 4, 0, NULL); | |
| 2792 _idx_to_blocklist[ciBlockIndex] = blocks; | |
| 2793 } | |
| 2794 | |
|
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|
2795 if (option != create_backedge_copy) { |
| 0 | 2796 int len = blocks->length(); |
| 2797 for (int i = 0; i < len; i++) { | |
| 2798 Block* block = blocks->at(i); | |
|
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|
2799 if (!block->is_backedge_copy() && block->is_compatible_with(jsrs)) { |
| 0 | 2800 return block; |
| 2801 } | |
| 2802 } | |
| 2803 } | |
| 2804 | |
| 2805 // Query only? | |
| 2806 if (option == no_create) return NULL; | |
| 2807 | |
| 2808 // We did not find a compatible block. Create one. | |
| 2809 Block* new_block = new (a) Block(this, _methodBlocks->block(ciBlockIndex), jsrs); | |
|
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|
2810 if (option == create_backedge_copy) new_block->set_backedge_copy(true); |
| 0 | 2811 blocks->append(new_block); |
| 2812 return new_block; | |
| 2813 } | |
| 2814 | |
| 2815 // ------------------------------------------------------------------ | |
|
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|
2816 // ciTypeFlow::backedge_copy_count |
| 0 | 2817 // |
|
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2818 int ciTypeFlow::backedge_copy_count(int ciBlockIndex, ciTypeFlow::JsrSet* jsrs) const { |
| 0 | 2819 GrowableArray<Block*>* blocks = _idx_to_blocklist[ciBlockIndex]; |
| 2820 | |
| 2821 if (blocks == NULL) { | |
| 2822 return 0; | |
| 2823 } | |
| 2824 | |
| 2825 int count = 0; | |
| 2826 int len = blocks->length(); | |
| 2827 for (int i = 0; i < len; i++) { | |
| 2828 Block* block = blocks->at(i); | |
|
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|
2829 if (block->is_backedge_copy() && block->is_compatible_with(jsrs)) { |
| 0 | 2830 count++; |
| 2831 } | |
| 2832 } | |
| 2833 | |
| 2834 return count; | |
| 2835 } | |
| 2836 | |
| 2837 // ------------------------------------------------------------------ | |
| 2838 // ciTypeFlow::do_flow | |
| 2839 // | |
| 2840 // Perform type inference flow analysis. | |
| 2841 void ciTypeFlow::do_flow() { | |
| 2842 if (CITraceTypeFlow) { | |
| 2843 tty->print_cr("\nPerforming flow analysis on method"); | |
| 2844 method()->print(); | |
| 2845 if (is_osr_flow()) tty->print(" at OSR bci %d", start_bci()); | |
| 2846 tty->cr(); | |
| 2847 method()->print_codes(); | |
| 2848 } | |
| 2849 if (CITraceTypeFlow) { | |
| 2850 tty->print_cr("Initial CI Blocks"); | |
| 2851 print_on(tty); | |
| 2852 } | |
| 2853 flow_types(); | |
| 2854 // Watch for bailouts. | |
| 2855 if (failing()) { | |
| 2856 return; | |
| 2857 } | |
|
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|
2858 |
|
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|
2859 map_blocks(); |
|
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|
2860 |
| 0 | 2861 if (CIPrintTypeFlow || CITraceTypeFlow) { |
|
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|
2862 rpo_print_on(tty); |
| 0 | 2863 } |
| 2864 } | |
| 2865 | |
| 2866 // ------------------------------------------------------------------ | |
| 2867 // ciTypeFlow::record_failure() | |
| 2868 // The ciTypeFlow object keeps track of failure reasons separately from the ciEnv. | |
| 2869 // This is required because there is not a 1-1 relation between the ciEnv and | |
| 2870 // the TypeFlow passes within a compilation task. For example, if the compiler | |
| 2871 // is considering inlining a method, it will request a TypeFlow. If that fails, | |
| 2872 // the compilation as a whole may continue without the inlining. Some TypeFlow | |
| 2873 // requests are not optional; if they fail the requestor is responsible for | |
| 2874 // copying the failure reason up to the ciEnv. (See Parse::Parse.) | |
| 2875 void ciTypeFlow::record_failure(const char* reason) { | |
| 2876 if (env()->log() != NULL) { | |
| 2877 env()->log()->elem("failure reason='%s' phase='typeflow'", reason); | |
| 2878 } | |
| 2879 if (_failure_reason == NULL) { | |
| 2880 // Record the first failure reason. | |
| 2881 _failure_reason = reason; | |
| 2882 } | |
| 2883 } | |
| 2884 | |
| 2885 #ifndef PRODUCT | |
| 2886 // ------------------------------------------------------------------ | |
| 2887 // ciTypeFlow::print_on | |
| 2888 void ciTypeFlow::print_on(outputStream* st) const { | |
| 2889 // Walk through CI blocks | |
| 2890 st->print_cr("********************************************************"); | |
| 2891 st->print ("TypeFlow for "); | |
| 2892 method()->name()->print_symbol_on(st); | |
| 2893 int limit_bci = code_size(); | |
| 2894 st->print_cr(" %d bytes", limit_bci); | |
| 2895 ciMethodBlocks *mblks = _methodBlocks; | |
| 2896 ciBlock* current = NULL; | |
| 2897 for (int bci = 0; bci < limit_bci; bci++) { | |
| 2898 ciBlock* blk = mblks->block_containing(bci); | |
| 2899 if (blk != NULL && blk != current) { | |
| 2900 current = blk; | |
| 2901 current->print_on(st); | |
| 2902 | |
| 2903 GrowableArray<Block*>* blocks = _idx_to_blocklist[blk->index()]; | |
| 2904 int num_blocks = (blocks == NULL) ? 0 : blocks->length(); | |
| 2905 | |
| 2906 if (num_blocks == 0) { | |
| 2907 st->print_cr(" No Blocks"); | |
| 2908 } else { | |
| 2909 for (int i = 0; i < num_blocks; i++) { | |
| 2910 Block* block = blocks->at(i); | |
| 2911 block->print_on(st); | |
| 2912 } | |
| 2913 } | |
| 2914 st->print_cr("--------------------------------------------------------"); | |
| 2915 st->cr(); | |
| 2916 } | |
| 2917 } | |
| 2918 st->print_cr("********************************************************"); | |
| 2919 st->cr(); | |
| 2920 } | |
|
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|
2921 |
|
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|
2922 void ciTypeFlow::rpo_print_on(outputStream* st) const { |
|
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|
2923 st->print_cr("********************************************************"); |
|
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|
2924 st->print ("TypeFlow for "); |
|
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|
2925 method()->name()->print_symbol_on(st); |
|
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|
2926 int limit_bci = code_size(); |
|
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|
2927 st->print_cr(" %d bytes", limit_bci); |
|
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|
2928 for (Block* blk = _rpo_list; blk != NULL; blk = blk->rpo_next()) { |
|
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|
2929 blk->print_on(st); |
|
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|
2930 st->print_cr("--------------------------------------------------------"); |
|
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|
2931 st->cr(); |
|
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|
2932 } |
|
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|
2933 st->print_cr("********************************************************"); |
|
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|
2934 st->cr(); |
|
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|
2935 } |
| 0 | 2936 #endif |