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annotate src/share/vm/opto/graphKit.cpp @ 3280:548597e74aa4
7030715: JSR 292 JRuby test/test_super_call_site_caching.rb asserts with +DoEscapeAnalysis
Reviewed-by: twisti
| author | never |
|---|---|
| date | Mon, 25 Apr 2011 16:25:58 -0700 |
| parents | 66b0e2371912 |
| children | 149bb459be66 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass
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2 * Copyright (c) 2001, 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 "compiler/compileLog.hpp" | |
| 27 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" | |
| 28 #include "gc_implementation/g1/heapRegion.hpp" | |
| 29 #include "gc_interface/collectedHeap.hpp" | |
| 30 #include "memory/barrierSet.hpp" | |
| 31 #include "memory/cardTableModRefBS.hpp" | |
| 32 #include "opto/addnode.hpp" | |
| 33 #include "opto/graphKit.hpp" | |
| 34 #include "opto/idealKit.hpp" | |
| 35 #include "opto/locknode.hpp" | |
| 36 #include "opto/machnode.hpp" | |
| 37 #include "opto/parse.hpp" | |
| 38 #include "opto/rootnode.hpp" | |
| 39 #include "opto/runtime.hpp" | |
| 40 #include "runtime/deoptimization.hpp" | |
| 41 #include "runtime/sharedRuntime.hpp" | |
| 0 | 42 |
| 43 //----------------------------GraphKit----------------------------------------- | |
| 44 // Main utility constructor. | |
| 45 GraphKit::GraphKit(JVMState* jvms) | |
| 46 : Phase(Phase::Parser), | |
| 47 _env(C->env()), | |
| 48 _gvn(*C->initial_gvn()) | |
| 49 { | |
| 50 _exceptions = jvms->map()->next_exception(); | |
| 51 if (_exceptions != NULL) jvms->map()->set_next_exception(NULL); | |
| 52 set_jvms(jvms); | |
| 53 } | |
| 54 | |
| 55 // Private constructor for parser. | |
| 56 GraphKit::GraphKit() | |
| 57 : Phase(Phase::Parser), | |
| 58 _env(C->env()), | |
| 59 _gvn(*C->initial_gvn()) | |
| 60 { | |
| 61 _exceptions = NULL; | |
| 62 set_map(NULL); | |
| 63 debug_only(_sp = -99); | |
| 64 debug_only(set_bci(-99)); | |
| 65 } | |
| 66 | |
| 67 | |
| 68 | |
| 69 //---------------------------clean_stack--------------------------------------- | |
| 70 // Clear away rubbish from the stack area of the JVM state. | |
| 71 // This destroys any arguments that may be waiting on the stack. | |
| 72 void GraphKit::clean_stack(int from_sp) { | |
| 73 SafePointNode* map = this->map(); | |
| 74 JVMState* jvms = this->jvms(); | |
| 75 int stk_size = jvms->stk_size(); | |
| 76 int stkoff = jvms->stkoff(); | |
| 77 Node* top = this->top(); | |
| 78 for (int i = from_sp; i < stk_size; i++) { | |
| 79 if (map->in(stkoff + i) != top) { | |
| 80 map->set_req(stkoff + i, top); | |
| 81 } | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 | |
| 86 //--------------------------------sync_jvms----------------------------------- | |
| 87 // Make sure our current jvms agrees with our parse state. | |
| 88 JVMState* GraphKit::sync_jvms() const { | |
| 89 JVMState* jvms = this->jvms(); | |
| 90 jvms->set_bci(bci()); // Record the new bci in the JVMState | |
| 91 jvms->set_sp(sp()); // Record the new sp in the JVMState | |
| 92 assert(jvms_in_sync(), "jvms is now in sync"); | |
| 93 return jvms; | |
| 94 } | |
| 95 | |
| 96 #ifdef ASSERT | |
| 97 bool GraphKit::jvms_in_sync() const { | |
| 98 Parse* parse = is_Parse(); | |
| 99 if (parse == NULL) { | |
| 100 if (bci() != jvms()->bci()) return false; | |
| 101 if (sp() != (int)jvms()->sp()) return false; | |
| 102 return true; | |
| 103 } | |
| 104 if (jvms()->method() != parse->method()) return false; | |
| 105 if (jvms()->bci() != parse->bci()) return false; | |
| 106 int jvms_sp = jvms()->sp(); | |
| 107 if (jvms_sp != parse->sp()) return false; | |
| 108 int jvms_depth = jvms()->depth(); | |
| 109 if (jvms_depth != parse->depth()) return false; | |
| 110 return true; | |
| 111 } | |
| 112 | |
| 113 // Local helper checks for special internal merge points | |
| 114 // used to accumulate and merge exception states. | |
| 115 // They are marked by the region's in(0) edge being the map itself. | |
| 116 // Such merge points must never "escape" into the parser at large, | |
| 117 // until they have been handed to gvn.transform. | |
| 118 static bool is_hidden_merge(Node* reg) { | |
| 119 if (reg == NULL) return false; | |
| 120 if (reg->is_Phi()) { | |
| 121 reg = reg->in(0); | |
| 122 if (reg == NULL) return false; | |
| 123 } | |
| 124 return reg->is_Region() && reg->in(0) != NULL && reg->in(0)->is_Root(); | |
| 125 } | |
| 126 | |
| 127 void GraphKit::verify_map() const { | |
| 128 if (map() == NULL) return; // null map is OK | |
| 129 assert(map()->req() <= jvms()->endoff(), "no extra garbage on map"); | |
| 130 assert(!map()->has_exceptions(), "call add_exception_states_from 1st"); | |
| 131 assert(!is_hidden_merge(control()), "call use_exception_state, not set_map"); | |
| 132 } | |
| 133 | |
| 134 void GraphKit::verify_exception_state(SafePointNode* ex_map) { | |
| 135 assert(ex_map->next_exception() == NULL, "not already part of a chain"); | |
| 136 assert(has_saved_ex_oop(ex_map), "every exception state has an ex_oop"); | |
| 137 } | |
| 138 #endif | |
| 139 | |
| 140 //---------------------------stop_and_kill_map--------------------------------- | |
| 141 // Set _map to NULL, signalling a stop to further bytecode execution. | |
| 142 // First smash the current map's control to a constant, to mark it dead. | |
| 143 void GraphKit::stop_and_kill_map() { | |
| 144 SafePointNode* dead_map = stop(); | |
| 145 if (dead_map != NULL) { | |
| 146 dead_map->disconnect_inputs(NULL); // Mark the map as killed. | |
| 147 assert(dead_map->is_killed(), "must be so marked"); | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 | |
| 152 //--------------------------------stopped-------------------------------------- | |
| 153 // Tell if _map is NULL, or control is top. | |
| 154 bool GraphKit::stopped() { | |
| 155 if (map() == NULL) return true; | |
| 156 else if (control() == top()) return true; | |
| 157 else return false; | |
| 158 } | |
| 159 | |
| 160 | |
| 161 //-----------------------------has_ex_handler---------------------------------- | |
| 162 // Tell if this method or any caller method has exception handlers. | |
| 163 bool GraphKit::has_ex_handler() { | |
| 164 for (JVMState* jvmsp = jvms(); jvmsp != NULL; jvmsp = jvmsp->caller()) { | |
| 165 if (jvmsp->has_method() && jvmsp->method()->has_exception_handlers()) { | |
| 166 return true; | |
| 167 } | |
| 168 } | |
| 169 return false; | |
| 170 } | |
| 171 | |
| 172 //------------------------------save_ex_oop------------------------------------ | |
| 173 // Save an exception without blowing stack contents or other JVM state. | |
| 174 void GraphKit::set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop) { | |
| 175 assert(!has_saved_ex_oop(ex_map), "clear ex-oop before setting again"); | |
| 176 ex_map->add_req(ex_oop); | |
| 177 debug_only(verify_exception_state(ex_map)); | |
| 178 } | |
| 179 | |
| 180 inline static Node* common_saved_ex_oop(SafePointNode* ex_map, bool clear_it) { | |
| 181 assert(GraphKit::has_saved_ex_oop(ex_map), "ex_oop must be there"); | |
| 182 Node* ex_oop = ex_map->in(ex_map->req()-1); | |
| 183 if (clear_it) ex_map->del_req(ex_map->req()-1); | |
| 184 return ex_oop; | |
| 185 } | |
| 186 | |
| 187 //-----------------------------saved_ex_oop------------------------------------ | |
| 188 // Recover a saved exception from its map. | |
| 189 Node* GraphKit::saved_ex_oop(SafePointNode* ex_map) { | |
| 190 return common_saved_ex_oop(ex_map, false); | |
| 191 } | |
| 192 | |
| 193 //--------------------------clear_saved_ex_oop--------------------------------- | |
| 194 // Erase a previously saved exception from its map. | |
| 195 Node* GraphKit::clear_saved_ex_oop(SafePointNode* ex_map) { | |
| 196 return common_saved_ex_oop(ex_map, true); | |
| 197 } | |
| 198 | |
| 199 #ifdef ASSERT | |
| 200 //---------------------------has_saved_ex_oop---------------------------------- | |
| 201 // Erase a previously saved exception from its map. | |
| 202 bool GraphKit::has_saved_ex_oop(SafePointNode* ex_map) { | |
| 203 return ex_map->req() == ex_map->jvms()->endoff()+1; | |
| 204 } | |
| 205 #endif | |
| 206 | |
| 207 //-------------------------make_exception_state-------------------------------- | |
| 208 // Turn the current JVM state into an exception state, appending the ex_oop. | |
| 209 SafePointNode* GraphKit::make_exception_state(Node* ex_oop) { | |
| 210 sync_jvms(); | |
| 211 SafePointNode* ex_map = stop(); // do not manipulate this map any more | |
| 212 set_saved_ex_oop(ex_map, ex_oop); | |
| 213 return ex_map; | |
| 214 } | |
| 215 | |
| 216 | |
| 217 //--------------------------add_exception_state-------------------------------- | |
| 218 // Add an exception to my list of exceptions. | |
| 219 void GraphKit::add_exception_state(SafePointNode* ex_map) { | |
| 220 if (ex_map == NULL || ex_map->control() == top()) { | |
| 221 return; | |
| 222 } | |
| 223 #ifdef ASSERT | |
| 224 verify_exception_state(ex_map); | |
| 225 if (has_exceptions()) { | |
| 226 assert(ex_map->jvms()->same_calls_as(_exceptions->jvms()), "all collected exceptions must come from the same place"); | |
| 227 } | |
| 228 #endif | |
| 229 | |
| 230 // If there is already an exception of exactly this type, merge with it. | |
| 231 // In particular, null-checks and other low-level exceptions common up here. | |
| 232 Node* ex_oop = saved_ex_oop(ex_map); | |
| 233 const Type* ex_type = _gvn.type(ex_oop); | |
| 234 if (ex_oop == top()) { | |
| 235 // No action needed. | |
| 236 return; | |
| 237 } | |
| 238 assert(ex_type->isa_instptr(), "exception must be an instance"); | |
| 239 for (SafePointNode* e2 = _exceptions; e2 != NULL; e2 = e2->next_exception()) { | |
| 240 const Type* ex_type2 = _gvn.type(saved_ex_oop(e2)); | |
| 241 // We check sp also because call bytecodes can generate exceptions | |
| 242 // both before and after arguments are popped! | |
| 243 if (ex_type2 == ex_type | |
| 244 && e2->_jvms->sp() == ex_map->_jvms->sp()) { | |
| 245 combine_exception_states(ex_map, e2); | |
| 246 return; | |
| 247 } | |
| 248 } | |
| 249 | |
| 250 // No pre-existing exception of the same type. Chain it on the list. | |
| 251 push_exception_state(ex_map); | |
| 252 } | |
| 253 | |
| 254 //-----------------------add_exception_states_from----------------------------- | |
| 255 void GraphKit::add_exception_states_from(JVMState* jvms) { | |
| 256 SafePointNode* ex_map = jvms->map()->next_exception(); | |
| 257 if (ex_map != NULL) { | |
| 258 jvms->map()->set_next_exception(NULL); | |
| 259 for (SafePointNode* next_map; ex_map != NULL; ex_map = next_map) { | |
| 260 next_map = ex_map->next_exception(); | |
| 261 ex_map->set_next_exception(NULL); | |
| 262 add_exception_state(ex_map); | |
| 263 } | |
| 264 } | |
| 265 } | |
| 266 | |
| 267 //-----------------------transfer_exceptions_into_jvms------------------------- | |
| 268 JVMState* GraphKit::transfer_exceptions_into_jvms() { | |
| 269 if (map() == NULL) { | |
| 270 // We need a JVMS to carry the exceptions, but the map has gone away. | |
| 271 // Create a scratch JVMS, cloned from any of the exception states... | |
| 272 if (has_exceptions()) { | |
| 273 _map = _exceptions; | |
| 274 _map = clone_map(); | |
| 275 _map->set_next_exception(NULL); | |
| 276 clear_saved_ex_oop(_map); | |
| 277 debug_only(verify_map()); | |
| 278 } else { | |
| 279 // ...or created from scratch | |
| 280 JVMState* jvms = new (C) JVMState(_method, NULL); | |
| 281 jvms->set_bci(_bci); | |
| 282 jvms->set_sp(_sp); | |
| 283 jvms->set_map(new (C, TypeFunc::Parms) SafePointNode(TypeFunc::Parms, jvms)); | |
| 284 set_jvms(jvms); | |
| 285 for (uint i = 0; i < map()->req(); i++) map()->init_req(i, top()); | |
| 286 set_all_memory(top()); | |
| 287 while (map()->req() < jvms->endoff()) map()->add_req(top()); | |
| 288 } | |
| 289 // (This is a kludge, in case you didn't notice.) | |
| 290 set_control(top()); | |
| 291 } | |
| 292 JVMState* jvms = sync_jvms(); | |
| 293 assert(!jvms->map()->has_exceptions(), "no exceptions on this map yet"); | |
| 294 jvms->map()->set_next_exception(_exceptions); | |
| 295 _exceptions = NULL; // done with this set of exceptions | |
| 296 return jvms; | |
| 297 } | |
| 298 | |
| 299 static inline void add_n_reqs(Node* dstphi, Node* srcphi) { | |
| 300 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
| 301 assert(is_hidden_merge(srcphi), "must be a special merge node"); | |
| 302 uint limit = srcphi->req(); | |
| 303 for (uint i = PhiNode::Input; i < limit; i++) { | |
| 304 dstphi->add_req(srcphi->in(i)); | |
| 305 } | |
| 306 } | |
| 307 static inline void add_one_req(Node* dstphi, Node* src) { | |
| 308 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
| 309 assert(!is_hidden_merge(src), "must not be a special merge node"); | |
| 310 dstphi->add_req(src); | |
| 311 } | |
| 312 | |
| 313 //-----------------------combine_exception_states------------------------------ | |
| 314 // This helper function combines exception states by building phis on a | |
| 315 // specially marked state-merging region. These regions and phis are | |
| 316 // untransformed, and can build up gradually. The region is marked by | |
| 317 // having a control input of its exception map, rather than NULL. Such | |
| 318 // regions do not appear except in this function, and in use_exception_state. | |
| 319 void GraphKit::combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map) { | |
| 320 if (failing()) return; // dying anyway... | |
| 321 JVMState* ex_jvms = ex_map->_jvms; | |
| 322 assert(ex_jvms->same_calls_as(phi_map->_jvms), "consistent call chains"); | |
| 323 assert(ex_jvms->stkoff() == phi_map->_jvms->stkoff(), "matching locals"); | |
| 324 assert(ex_jvms->sp() == phi_map->_jvms->sp(), "matching stack sizes"); | |
| 325 assert(ex_jvms->monoff() == phi_map->_jvms->monoff(), "matching JVMS"); | |
| 326 assert(ex_map->req() == phi_map->req(), "matching maps"); | |
| 327 uint tos = ex_jvms->stkoff() + ex_jvms->sp(); | |
| 328 Node* hidden_merge_mark = root(); | |
| 329 Node* region = phi_map->control(); | |
| 330 MergeMemNode* phi_mem = phi_map->merged_memory(); | |
| 331 MergeMemNode* ex_mem = ex_map->merged_memory(); | |
| 332 if (region->in(0) != hidden_merge_mark) { | |
| 333 // The control input is not (yet) a specially-marked region in phi_map. | |
| 334 // Make it so, and build some phis. | |
| 335 region = new (C, 2) RegionNode(2); | |
| 336 _gvn.set_type(region, Type::CONTROL); | |
| 337 region->set_req(0, hidden_merge_mark); // marks an internal ex-state | |
| 338 region->init_req(1, phi_map->control()); | |
| 339 phi_map->set_control(region); | |
| 340 Node* io_phi = PhiNode::make(region, phi_map->i_o(), Type::ABIO); | |
| 341 record_for_igvn(io_phi); | |
| 342 _gvn.set_type(io_phi, Type::ABIO); | |
| 343 phi_map->set_i_o(io_phi); | |
| 344 for (MergeMemStream mms(phi_mem); mms.next_non_empty(); ) { | |
| 345 Node* m = mms.memory(); | |
| 346 Node* m_phi = PhiNode::make(region, m, Type::MEMORY, mms.adr_type(C)); | |
| 347 record_for_igvn(m_phi); | |
| 348 _gvn.set_type(m_phi, Type::MEMORY); | |
| 349 mms.set_memory(m_phi); | |
| 350 } | |
| 351 } | |
| 352 | |
| 353 // Either or both of phi_map and ex_map might already be converted into phis. | |
| 354 Node* ex_control = ex_map->control(); | |
| 355 // if there is special marking on ex_map also, we add multiple edges from src | |
| 356 bool add_multiple = (ex_control->in(0) == hidden_merge_mark); | |
| 357 // how wide was the destination phi_map, originally? | |
| 358 uint orig_width = region->req(); | |
| 359 | |
| 360 if (add_multiple) { | |
| 361 add_n_reqs(region, ex_control); | |
| 362 add_n_reqs(phi_map->i_o(), ex_map->i_o()); | |
| 363 } else { | |
| 364 // ex_map has no merges, so we just add single edges everywhere | |
| 365 add_one_req(region, ex_control); | |
| 366 add_one_req(phi_map->i_o(), ex_map->i_o()); | |
| 367 } | |
| 368 for (MergeMemStream mms(phi_mem, ex_mem); mms.next_non_empty2(); ) { | |
| 369 if (mms.is_empty()) { | |
| 370 // get a copy of the base memory, and patch some inputs into it | |
| 371 const TypePtr* adr_type = mms.adr_type(C); | |
| 372 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type); | |
| 373 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), ""); | |
| 374 mms.set_memory(phi); | |
| 375 // Prepare to append interesting stuff onto the newly sliced phi: | |
| 376 while (phi->req() > orig_width) phi->del_req(phi->req()-1); | |
| 377 } | |
| 378 // Append stuff from ex_map: | |
| 379 if (add_multiple) { | |
| 380 add_n_reqs(mms.memory(), mms.memory2()); | |
| 381 } else { | |
| 382 add_one_req(mms.memory(), mms.memory2()); | |
| 383 } | |
| 384 } | |
| 385 uint limit = ex_map->req(); | |
| 386 for (uint i = TypeFunc::Parms; i < limit; i++) { | |
| 387 // Skip everything in the JVMS after tos. (The ex_oop follows.) | |
| 388 if (i == tos) i = ex_jvms->monoff(); | |
| 389 Node* src = ex_map->in(i); | |
| 390 Node* dst = phi_map->in(i); | |
| 391 if (src != dst) { | |
| 392 PhiNode* phi; | |
| 393 if (dst->in(0) != region) { | |
| 394 dst = phi = PhiNode::make(region, dst, _gvn.type(dst)); | |
| 395 record_for_igvn(phi); | |
| 396 _gvn.set_type(phi, phi->type()); | |
| 397 phi_map->set_req(i, dst); | |
| 398 // Prepare to append interesting stuff onto the new phi: | |
| 399 while (dst->req() > orig_width) dst->del_req(dst->req()-1); | |
| 400 } else { | |
| 401 assert(dst->is_Phi(), "nobody else uses a hidden region"); | |
| 402 phi = (PhiNode*)dst; | |
| 403 } | |
| 404 if (add_multiple && src->in(0) == ex_control) { | |
| 405 // Both are phis. | |
| 406 add_n_reqs(dst, src); | |
| 407 } else { | |
| 408 while (dst->req() < region->req()) add_one_req(dst, src); | |
| 409 } | |
| 410 const Type* srctype = _gvn.type(src); | |
| 411 if (phi->type() != srctype) { | |
| 412 const Type* dsttype = phi->type()->meet(srctype); | |
| 413 if (phi->type() != dsttype) { | |
| 414 phi->set_type(dsttype); | |
| 415 _gvn.set_type(phi, dsttype); | |
| 416 } | |
| 417 } | |
| 418 } | |
| 419 } | |
| 420 } | |
| 421 | |
| 422 //--------------------------use_exception_state-------------------------------- | |
| 423 Node* GraphKit::use_exception_state(SafePointNode* phi_map) { | |
| 424 if (failing()) { stop(); return top(); } | |
| 425 Node* region = phi_map->control(); | |
| 426 Node* hidden_merge_mark = root(); | |
| 427 assert(phi_map->jvms()->map() == phi_map, "sanity: 1-1 relation"); | |
| 428 Node* ex_oop = clear_saved_ex_oop(phi_map); | |
| 429 if (region->in(0) == hidden_merge_mark) { | |
| 430 // Special marking for internal ex-states. Process the phis now. | |
| 431 region->set_req(0, region); // now it's an ordinary region | |
| 432 set_jvms(phi_map->jvms()); // ...so now we can use it as a map | |
| 433 // Note: Setting the jvms also sets the bci and sp. | |
| 434 set_control(_gvn.transform(region)); | |
| 435 uint tos = jvms()->stkoff() + sp(); | |
| 436 for (uint i = 1; i < tos; i++) { | |
| 437 Node* x = phi_map->in(i); | |
| 438 if (x->in(0) == region) { | |
| 439 assert(x->is_Phi(), "expected a special phi"); | |
| 440 phi_map->set_req(i, _gvn.transform(x)); | |
| 441 } | |
| 442 } | |
| 443 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) { | |
| 444 Node* x = mms.memory(); | |
| 445 if (x->in(0) == region) { | |
| 446 assert(x->is_Phi(), "nobody else uses a hidden region"); | |
| 447 mms.set_memory(_gvn.transform(x)); | |
| 448 } | |
| 449 } | |
| 450 if (ex_oop->in(0) == region) { | |
| 451 assert(ex_oop->is_Phi(), "expected a special phi"); | |
| 452 ex_oop = _gvn.transform(ex_oop); | |
| 453 } | |
| 454 } else { | |
| 455 set_jvms(phi_map->jvms()); | |
| 456 } | |
| 457 | |
| 458 assert(!is_hidden_merge(phi_map->control()), "hidden ex. states cleared"); | |
| 459 assert(!is_hidden_merge(phi_map->i_o()), "hidden ex. states cleared"); | |
| 460 return ex_oop; | |
| 461 } | |
| 462 | |
| 463 //---------------------------------java_bc------------------------------------- | |
| 464 Bytecodes::Code GraphKit::java_bc() const { | |
| 465 ciMethod* method = this->method(); | |
| 466 int bci = this->bci(); | |
| 467 if (method != NULL && bci != InvocationEntryBci) | |
| 468 return method->java_code_at_bci(bci); | |
| 469 else | |
| 470 return Bytecodes::_illegal; | |
| 471 } | |
| 472 | |
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473 void GraphKit::uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason, |
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474 bool must_throw) { |
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475 // if the exception capability is set, then we will generate code |
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476 // to check the JavaThread.should_post_on_exceptions flag to see |
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477 // if we actually need to report exception events (for this |
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478 // thread). If we don't need to report exception events, we will |
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479 // take the normal fast path provided by add_exception_events. If |
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480 // exception event reporting is enabled for this thread, we will |
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481 // take the uncommon_trap in the BuildCutout below. |
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482 |
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483 // first must access the should_post_on_exceptions_flag in this thread's JavaThread |
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484 Node* jthread = _gvn.transform(new (C, 1) ThreadLocalNode()); |
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485 Node* adr = basic_plus_adr(top(), jthread, in_bytes(JavaThread::should_post_on_exceptions_flag_offset())); |
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486 Node* should_post_flag = make_load(control(), adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw, false); |
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487 |
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488 // Test the should_post_on_exceptions_flag vs. 0 |
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489 Node* chk = _gvn.transform( new (C, 3) CmpINode(should_post_flag, intcon(0)) ); |
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490 Node* tst = _gvn.transform( new (C, 2) BoolNode(chk, BoolTest::eq) ); |
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491 |
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492 // Branch to slow_path if should_post_on_exceptions_flag was true |
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493 { BuildCutout unless(this, tst, PROB_MAX); |
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494 // Do not try anything fancy if we're notifying the VM on every throw. |
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495 // Cf. case Bytecodes::_athrow in parse2.cpp. |
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496 uncommon_trap(reason, Deoptimization::Action_none, |
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497 (ciKlass*)NULL, (char*)NULL, must_throw); |
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498 } |
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499 |
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500 } |
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501 |
| 0 | 502 //------------------------------builtin_throw---------------------------------- |
| 503 void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) { | |
| 504 bool must_throw = true; | |
| 505 | |
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506 if (env()->jvmti_can_post_on_exceptions()) { |
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507 // check if we must post exception events, take uncommon trap if so |
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508 uncommon_trap_if_should_post_on_exceptions(reason, must_throw); |
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509 // here if should_post_on_exceptions is false |
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510 // continue on with the normal codegen |
| 0 | 511 } |
| 512 | |
| 513 // If this particular condition has not yet happened at this | |
| 514 // bytecode, then use the uncommon trap mechanism, and allow for | |
| 515 // a future recompilation if several traps occur here. | |
| 516 // If the throw is hot, try to use a more complicated inline mechanism | |
| 517 // which keeps execution inside the compiled code. | |
| 518 bool treat_throw_as_hot = false; | |
| 519 ciMethodData* md = method()->method_data(); | |
| 520 | |
| 521 if (ProfileTraps) { | |
| 522 if (too_many_traps(reason)) { | |
| 523 treat_throw_as_hot = true; | |
| 524 } | |
| 525 // (If there is no MDO at all, assume it is early in | |
| 526 // execution, and that any deopts are part of the | |
| 527 // startup transient, and don't need to be remembered.) | |
| 528 | |
| 529 // Also, if there is a local exception handler, treat all throws | |
| 530 // as hot if there has been at least one in this method. | |
| 531 if (C->trap_count(reason) != 0 | |
| 532 && method()->method_data()->trap_count(reason) != 0 | |
| 533 && has_ex_handler()) { | |
| 534 treat_throw_as_hot = true; | |
| 535 } | |
| 536 } | |
| 537 | |
| 538 // If this throw happens frequently, an uncommon trap might cause | |
| 539 // a performance pothole. If there is a local exception handler, | |
| 540 // and if this particular bytecode appears to be deoptimizing often, | |
| 541 // let us handle the throw inline, with a preconstructed instance. | |
| 542 // Note: If the deopt count has blown up, the uncommon trap | |
| 543 // runtime is going to flush this nmethod, not matter what. | |
| 544 if (treat_throw_as_hot | |
| 545 && (!StackTraceInThrowable || OmitStackTraceInFastThrow)) { | |
| 546 // If the throw is local, we use a pre-existing instance and | |
| 547 // punt on the backtrace. This would lead to a missing backtrace | |
| 548 // (a repeat of 4292742) if the backtrace object is ever asked | |
| 549 // for its backtrace. | |
| 550 // Fixing this remaining case of 4292742 requires some flavor of | |
| 551 // escape analysis. Leave that for the future. | |
| 552 ciInstance* ex_obj = NULL; | |
| 553 switch (reason) { | |
| 554 case Deoptimization::Reason_null_check: | |
| 555 ex_obj = env()->NullPointerException_instance(); | |
| 556 break; | |
| 557 case Deoptimization::Reason_div0_check: | |
| 558 ex_obj = env()->ArithmeticException_instance(); | |
| 559 break; | |
| 560 case Deoptimization::Reason_range_check: | |
| 561 ex_obj = env()->ArrayIndexOutOfBoundsException_instance(); | |
| 562 break; | |
| 563 case Deoptimization::Reason_class_check: | |
| 564 if (java_bc() == Bytecodes::_aastore) { | |
| 565 ex_obj = env()->ArrayStoreException_instance(); | |
| 566 } else { | |
| 567 ex_obj = env()->ClassCastException_instance(); | |
| 568 } | |
| 569 break; | |
| 570 } | |
| 571 if (failing()) { stop(); return; } // exception allocation might fail | |
| 572 if (ex_obj != NULL) { | |
| 573 // Cheat with a preallocated exception object. | |
| 574 if (C->log() != NULL) | |
| 575 C->log()->elem("hot_throw preallocated='1' reason='%s'", | |
| 576 Deoptimization::trap_reason_name(reason)); | |
| 577 const TypeInstPtr* ex_con = TypeInstPtr::make(ex_obj); | |
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578 Node* ex_node = _gvn.transform( ConNode::make(C, ex_con) ); |
| 0 | 579 |
| 580 // Clear the detail message of the preallocated exception object. | |
| 581 // Weblogic sometimes mutates the detail message of exceptions | |
| 582 // using reflection. | |
| 583 int offset = java_lang_Throwable::get_detailMessage_offset(); | |
| 584 const TypePtr* adr_typ = ex_con->add_offset(offset); | |
| 585 | |
| 586 Node *adr = basic_plus_adr(ex_node, ex_node, offset); | |
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587 const TypeOopPtr* val_type = TypeOopPtr::make_from_klass(env()->String_klass()); |
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588 Node *store = store_oop_to_object(control(), ex_node, adr, adr_typ, null(), val_type, T_OBJECT); |
| 0 | 589 |
| 590 add_exception_state(make_exception_state(ex_node)); | |
| 591 return; | |
| 592 } | |
| 593 } | |
| 594 | |
| 595 // %%% Maybe add entry to OptoRuntime which directly throws the exc.? | |
| 596 // It won't be much cheaper than bailing to the interp., since we'll | |
| 597 // have to pass up all the debug-info, and the runtime will have to | |
| 598 // create the stack trace. | |
| 599 | |
| 600 // Usual case: Bail to interpreter. | |
| 601 // Reserve the right to recompile if we haven't seen anything yet. | |
| 602 | |
| 603 Deoptimization::DeoptAction action = Deoptimization::Action_maybe_recompile; | |
| 604 if (treat_throw_as_hot | |
| 605 && (method()->method_data()->trap_recompiled_at(bci()) | |
| 606 || C->too_many_traps(reason))) { | |
| 607 // We cannot afford to take more traps here. Suffer in the interpreter. | |
| 608 if (C->log() != NULL) | |
| 609 C->log()->elem("hot_throw preallocated='0' reason='%s' mcount='%d'", | |
| 610 Deoptimization::trap_reason_name(reason), | |
| 611 C->trap_count(reason)); | |
| 612 action = Deoptimization::Action_none; | |
| 613 } | |
| 614 | |
| 615 // "must_throw" prunes the JVM state to include only the stack, if there | |
| 616 // are no local exception handlers. This should cut down on register | |
| 617 // allocation time and code size, by drastically reducing the number | |
| 618 // of in-edges on the call to the uncommon trap. | |
| 619 | |
| 620 uncommon_trap(reason, action, (ciKlass*)NULL, (char*)NULL, must_throw); | |
| 621 } | |
| 622 | |
| 623 | |
| 624 //----------------------------PreserveJVMState--------------------------------- | |
| 625 PreserveJVMState::PreserveJVMState(GraphKit* kit, bool clone_map) { | |
| 626 debug_only(kit->verify_map()); | |
| 627 _kit = kit; | |
| 628 _map = kit->map(); // preserve the map | |
| 629 _sp = kit->sp(); | |
| 630 kit->set_map(clone_map ? kit->clone_map() : NULL); | |
| 631 #ifdef ASSERT | |
| 632 _bci = kit->bci(); | |
| 633 Parse* parser = kit->is_Parse(); | |
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634 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
| 0 | 635 _block = block; |
| 636 #endif | |
| 637 } | |
| 638 PreserveJVMState::~PreserveJVMState() { | |
| 639 GraphKit* kit = _kit; | |
| 640 #ifdef ASSERT | |
| 641 assert(kit->bci() == _bci, "bci must not shift"); | |
| 642 Parse* parser = kit->is_Parse(); | |
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643 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
| 0 | 644 assert(block == _block, "block must not shift"); |
| 645 #endif | |
| 646 kit->set_map(_map); | |
| 647 kit->set_sp(_sp); | |
| 648 } | |
| 649 | |
| 650 | |
| 651 //-----------------------------BuildCutout------------------------------------- | |
| 652 BuildCutout::BuildCutout(GraphKit* kit, Node* p, float prob, float cnt) | |
| 653 : PreserveJVMState(kit) | |
| 654 { | |
| 655 assert(p->is_Con() || p->is_Bool(), "test must be a bool"); | |
| 656 SafePointNode* outer_map = _map; // preserved map is caller's | |
| 657 SafePointNode* inner_map = kit->map(); | |
| 658 IfNode* iff = kit->create_and_map_if(outer_map->control(), p, prob, cnt); | |
| 659 outer_map->set_control(kit->gvn().transform( new (kit->C, 1) IfTrueNode(iff) )); | |
| 660 inner_map->set_control(kit->gvn().transform( new (kit->C, 1) IfFalseNode(iff) )); | |
| 661 } | |
| 662 BuildCutout::~BuildCutout() { | |
| 663 GraphKit* kit = _kit; | |
| 664 assert(kit->stopped(), "cutout code must stop, throw, return, etc."); | |
| 665 } | |
| 666 | |
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667 //---------------------------PreserveReexecuteState---------------------------- |
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668 PreserveReexecuteState::PreserveReexecuteState(GraphKit* kit) { |
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669 assert(!kit->stopped(), "must call stopped() before"); |
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670 _kit = kit; |
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671 _sp = kit->sp(); |
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672 _reexecute = kit->jvms()->_reexecute; |
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673 } |
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674 PreserveReexecuteState::~PreserveReexecuteState() { |
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675 if (_kit->stopped()) return; |
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676 _kit->jvms()->_reexecute = _reexecute; |
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677 _kit->set_sp(_sp); |
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678 } |
| 0 | 679 |
| 680 //------------------------------clone_map-------------------------------------- | |
| 681 // Implementation of PreserveJVMState | |
| 682 // | |
| 683 // Only clone_map(...) here. If this function is only used in the | |
| 684 // PreserveJVMState class we may want to get rid of this extra | |
| 685 // function eventually and do it all there. | |
| 686 | |
| 687 SafePointNode* GraphKit::clone_map() { | |
| 688 if (map() == NULL) return NULL; | |
| 689 | |
| 690 // Clone the memory edge first | |
| 691 Node* mem = MergeMemNode::make(C, map()->memory()); | |
| 692 gvn().set_type_bottom(mem); | |
| 693 | |
| 694 SafePointNode *clonemap = (SafePointNode*)map()->clone(); | |
| 695 JVMState* jvms = this->jvms(); | |
| 696 JVMState* clonejvms = jvms->clone_shallow(C); | |
| 697 clonemap->set_memory(mem); | |
| 698 clonemap->set_jvms(clonejvms); | |
| 699 clonejvms->set_map(clonemap); | |
| 700 record_for_igvn(clonemap); | |
| 701 gvn().set_type_bottom(clonemap); | |
| 702 return clonemap; | |
| 703 } | |
| 704 | |
| 705 | |
| 706 //-----------------------------set_map_clone----------------------------------- | |
| 707 void GraphKit::set_map_clone(SafePointNode* m) { | |
| 708 _map = m; | |
| 709 _map = clone_map(); | |
| 710 _map->set_next_exception(NULL); | |
| 711 debug_only(verify_map()); | |
| 712 } | |
| 713 | |
| 714 | |
| 715 //----------------------------kill_dead_locals--------------------------------- | |
| 716 // Detect any locals which are known to be dead, and force them to top. | |
| 717 void GraphKit::kill_dead_locals() { | |
| 718 // Consult the liveness information for the locals. If any | |
| 719 // of them are unused, then they can be replaced by top(). This | |
| 720 // should help register allocation time and cut down on the size | |
| 721 // of the deoptimization information. | |
| 722 | |
| 723 // This call is made from many of the bytecode handling | |
| 724 // subroutines called from the Big Switch in do_one_bytecode. | |
| 725 // Every bytecode which might include a slow path is responsible | |
| 726 // for killing its dead locals. The more consistent we | |
| 727 // are about killing deads, the fewer useless phis will be | |
| 728 // constructed for them at various merge points. | |
| 729 | |
| 730 // bci can be -1 (InvocationEntryBci). We return the entry | |
| 731 // liveness for the method. | |
| 732 | |
| 733 if (method() == NULL || method()->code_size() == 0) { | |
| 734 // We are building a graph for a call to a native method. | |
| 735 // All locals are live. | |
| 736 return; | |
| 737 } | |
| 738 | |
| 739 ResourceMark rm; | |
| 740 | |
| 741 // Consult the liveness information for the locals. If any | |
| 742 // of them are unused, then they can be replaced by top(). This | |
| 743 // should help register allocation time and cut down on the size | |
| 744 // of the deoptimization information. | |
| 745 MethodLivenessResult live_locals = method()->liveness_at_bci(bci()); | |
| 746 | |
| 747 int len = (int)live_locals.size(); | |
| 748 assert(len <= jvms()->loc_size(), "too many live locals"); | |
| 749 for (int local = 0; local < len; local++) { | |
| 750 if (!live_locals.at(local)) { | |
| 751 set_local(local, top()); | |
| 752 } | |
| 753 } | |
| 754 } | |
| 755 | |
| 756 #ifdef ASSERT | |
| 757 //-------------------------dead_locals_are_killed------------------------------ | |
| 758 // Return true if all dead locals are set to top in the map. | |
| 759 // Used to assert "clean" debug info at various points. | |
| 760 bool GraphKit::dead_locals_are_killed() { | |
| 761 if (method() == NULL || method()->code_size() == 0) { | |
| 762 // No locals need to be dead, so all is as it should be. | |
| 763 return true; | |
| 764 } | |
| 765 | |
| 766 // Make sure somebody called kill_dead_locals upstream. | |
| 767 ResourceMark rm; | |
| 768 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
| 769 if (jvms->loc_size() == 0) continue; // no locals to consult | |
| 770 SafePointNode* map = jvms->map(); | |
| 771 ciMethod* method = jvms->method(); | |
| 772 int bci = jvms->bci(); | |
| 773 if (jvms == this->jvms()) { | |
| 774 bci = this->bci(); // it might not yet be synched | |
| 775 } | |
| 776 MethodLivenessResult live_locals = method->liveness_at_bci(bci); | |
| 777 int len = (int)live_locals.size(); | |
| 778 if (!live_locals.is_valid() || len == 0) | |
| 779 // This method is trivial, or is poisoned by a breakpoint. | |
| 780 return true; | |
| 781 assert(len == jvms->loc_size(), "live map consistent with locals map"); | |
| 782 for (int local = 0; local < len; local++) { | |
| 783 if (!live_locals.at(local) && map->local(jvms, local) != top()) { | |
| 784 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 785 tty->print_cr("Zombie local %d: ", local); | |
| 786 jvms->dump(); | |
| 787 } | |
| 788 return false; | |
| 789 } | |
| 790 } | |
| 791 } | |
| 792 return true; | |
| 793 } | |
| 794 | |
| 795 #endif //ASSERT | |
| 796 | |
|
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797 // Helper function for enforcing certain bytecodes to reexecute if |
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798 // deoptimization happens |
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799 static bool should_reexecute_implied_by_bytecode(JVMState *jvms, bool is_anewarray) { |
|
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800 ciMethod* cur_method = jvms->method(); |
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801 int cur_bci = jvms->bci(); |
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802 if (cur_method != NULL && cur_bci != InvocationEntryBci) { |
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803 Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci); |
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804 return Interpreter::bytecode_should_reexecute(code) || |
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805 is_anewarray && code == Bytecodes::_multianewarray; |
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806 // Reexecute _multianewarray bytecode which was replaced with |
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807 // sequence of [a]newarray. See Parse::do_multianewarray(). |
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808 // |
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809 // Note: interpreter should not have it set since this optimization |
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810 // is limited by dimensions and guarded by flag so in some cases |
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811 // multianewarray() runtime calls will be generated and |
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812 // the bytecode should not be reexecutes (stack will not be reset). |
|
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813 } else |
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814 return false; |
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815 } |
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816 |
| 0 | 817 // Helper function for adding JVMState and debug information to node |
| 818 void GraphKit::add_safepoint_edges(SafePointNode* call, bool must_throw) { | |
| 819 // Add the safepoint edges to the call (or other safepoint). | |
| 820 | |
| 821 // Make sure dead locals are set to top. This | |
| 822 // should help register allocation time and cut down on the size | |
| 823 // of the deoptimization information. | |
| 824 assert(dead_locals_are_killed(), "garbage in debug info before safepoint"); | |
| 825 | |
| 826 // Walk the inline list to fill in the correct set of JVMState's | |
| 827 // Also fill in the associated edges for each JVMState. | |
| 828 | |
| 829 JVMState* youngest_jvms = sync_jvms(); | |
| 830 | |
| 831 // If we are guaranteed to throw, we can prune everything but the | |
| 832 // input to the current bytecode. | |
| 833 bool can_prune_locals = false; | |
| 834 uint stack_slots_not_pruned = 0; | |
| 835 int inputs = 0, depth = 0; | |
| 836 if (must_throw) { | |
| 837 assert(method() == youngest_jvms->method(), "sanity"); | |
| 838 if (compute_stack_effects(inputs, depth)) { | |
| 839 can_prune_locals = true; | |
| 840 stack_slots_not_pruned = inputs; | |
| 841 } | |
| 842 } | |
| 843 | |
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844 if (env()->jvmti_can_access_local_variables()) { |
| 0 | 845 // At any safepoint, this method can get breakpointed, which would |
| 846 // then require an immediate deoptimization. | |
| 847 can_prune_locals = false; // do not prune locals | |
| 848 stack_slots_not_pruned = 0; | |
| 849 } | |
| 850 | |
| 851 // do not scribble on the input jvms | |
| 852 JVMState* out_jvms = youngest_jvms->clone_deep(C); | |
| 853 call->set_jvms(out_jvms); // Start jvms list for call node | |
| 854 | |
|
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855 // For a known set of bytecodes, the interpreter should reexecute them if |
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856 // deoptimization happens. We set the reexecute state for them here |
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857 if (out_jvms->is_reexecute_undefined() && //don't change if already specified |
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858 should_reexecute_implied_by_bytecode(out_jvms, call->is_AllocateArray())) { |
|
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859 out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed |
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860 } |
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861 |
| 0 | 862 // Presize the call: |
| 863 debug_only(uint non_debug_edges = call->req()); | |
| 864 call->add_req_batch(top(), youngest_jvms->debug_depth()); | |
| 865 assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), ""); | |
| 866 | |
| 867 // Set up edges so that the call looks like this: | |
| 868 // Call [state:] ctl io mem fptr retadr | |
| 869 // [parms:] parm0 ... parmN | |
| 870 // [root:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
| 871 // [...mid:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...] | |
| 872 // [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
| 873 // Note that caller debug info precedes callee debug info. | |
| 874 | |
| 875 // Fill pointer walks backwards from "young:" to "root:" in the diagram above: | |
| 876 uint debug_ptr = call->req(); | |
| 877 | |
| 878 // Loop over the map input edges associated with jvms, add them | |
| 879 // to the call node, & reset all offsets to match call node array. | |
| 880 for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) { | |
| 881 uint debug_end = debug_ptr; | |
| 882 uint debug_start = debug_ptr - in_jvms->debug_size(); | |
| 883 debug_ptr = debug_start; // back up the ptr | |
| 884 | |
| 885 uint p = debug_start; // walks forward in [debug_start, debug_end) | |
| 886 uint j, k, l; | |
| 887 SafePointNode* in_map = in_jvms->map(); | |
| 888 out_jvms->set_map(call); | |
| 889 | |
| 890 if (can_prune_locals) { | |
| 891 assert(in_jvms->method() == out_jvms->method(), "sanity"); | |
| 892 // If the current throw can reach an exception handler in this JVMS, | |
| 893 // then we must keep everything live that can reach that handler. | |
| 894 // As a quick and dirty approximation, we look for any handlers at all. | |
| 895 if (in_jvms->method()->has_exception_handlers()) { | |
| 896 can_prune_locals = false; | |
| 897 } | |
| 898 } | |
| 899 | |
| 900 // Add the Locals | |
| 901 k = in_jvms->locoff(); | |
| 902 l = in_jvms->loc_size(); | |
| 903 out_jvms->set_locoff(p); | |
|
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904 if (!can_prune_locals) { |
| 0 | 905 for (j = 0; j < l; j++) |
| 906 call->set_req(p++, in_map->in(k+j)); | |
| 907 } else { | |
| 908 p += l; // already set to top above by add_req_batch | |
| 909 } | |
| 910 | |
| 911 // Add the Expression Stack | |
| 912 k = in_jvms->stkoff(); | |
| 913 l = in_jvms->sp(); | |
| 914 out_jvms->set_stkoff(p); | |
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915 if (!can_prune_locals) { |
| 0 | 916 for (j = 0; j < l; j++) |
| 917 call->set_req(p++, in_map->in(k+j)); | |
| 918 } else if (can_prune_locals && stack_slots_not_pruned != 0) { | |
| 919 // Divide stack into {S0,...,S1}, where S0 is set to top. | |
| 920 uint s1 = stack_slots_not_pruned; | |
| 921 stack_slots_not_pruned = 0; // for next iteration | |
| 922 if (s1 > l) s1 = l; | |
| 923 uint s0 = l - s1; | |
| 924 p += s0; // skip the tops preinstalled by add_req_batch | |
| 925 for (j = s0; j < l; j++) | |
| 926 call->set_req(p++, in_map->in(k+j)); | |
| 927 } else { | |
| 928 p += l; // already set to top above by add_req_batch | |
| 929 } | |
| 930 | |
| 931 // Add the Monitors | |
| 932 k = in_jvms->monoff(); | |
| 933 l = in_jvms->mon_size(); | |
| 934 out_jvms->set_monoff(p); | |
| 935 for (j = 0; j < l; j++) | |
| 936 call->set_req(p++, in_map->in(k+j)); | |
| 937 | |
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938 // Copy any scalar object fields. |
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939 k = in_jvms->scloff(); |
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940 l = in_jvms->scl_size(); |
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941 out_jvms->set_scloff(p); |
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942 for (j = 0; j < l; j++) |
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943 call->set_req(p++, in_map->in(k+j)); |
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944 |
| 0 | 945 // Finish the new jvms. |
| 946 out_jvms->set_endoff(p); | |
| 947 | |
| 948 assert(out_jvms->endoff() == debug_end, "fill ptr must match"); | |
| 949 assert(out_jvms->depth() == in_jvms->depth(), "depth must match"); | |
| 950 assert(out_jvms->loc_size() == in_jvms->loc_size(), "size must match"); | |
| 951 assert(out_jvms->mon_size() == in_jvms->mon_size(), "size must match"); | |
|
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952 assert(out_jvms->scl_size() == in_jvms->scl_size(), "size must match"); |
| 0 | 953 assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match"); |
| 954 | |
| 955 // Update the two tail pointers in parallel. | |
| 956 out_jvms = out_jvms->caller(); | |
| 957 in_jvms = in_jvms->caller(); | |
| 958 } | |
| 959 | |
| 960 assert(debug_ptr == non_debug_edges, "debug info must fit exactly"); | |
| 961 | |
| 962 // Test the correctness of JVMState::debug_xxx accessors: | |
| 963 assert(call->jvms()->debug_start() == non_debug_edges, ""); | |
| 964 assert(call->jvms()->debug_end() == call->req(), ""); | |
| 965 assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, ""); | |
| 966 } | |
| 967 | |
| 968 bool GraphKit::compute_stack_effects(int& inputs, int& depth) { | |
| 969 Bytecodes::Code code = java_bc(); | |
| 970 if (code == Bytecodes::_wide) { | |
| 971 code = method()->java_code_at_bci(bci() + 1); | |
| 972 } | |
| 973 | |
| 974 BasicType rtype = T_ILLEGAL; | |
| 975 int rsize = 0; | |
| 976 | |
| 977 if (code != Bytecodes::_illegal) { | |
| 978 depth = Bytecodes::depth(code); // checkcast=0, athrow=-1 | |
| 979 rtype = Bytecodes::result_type(code); // checkcast=P, athrow=V | |
| 980 if (rtype < T_CONFLICT) | |
| 981 rsize = type2size[rtype]; | |
| 982 } | |
| 983 | |
| 984 switch (code) { | |
| 985 case Bytecodes::_illegal: | |
| 986 return false; | |
| 987 | |
| 988 case Bytecodes::_ldc: | |
| 989 case Bytecodes::_ldc_w: | |
| 990 case Bytecodes::_ldc2_w: | |
| 991 inputs = 0; | |
| 992 break; | |
| 993 | |
| 994 case Bytecodes::_dup: inputs = 1; break; | |
| 995 case Bytecodes::_dup_x1: inputs = 2; break; | |
| 996 case Bytecodes::_dup_x2: inputs = 3; break; | |
| 997 case Bytecodes::_dup2: inputs = 2; break; | |
| 998 case Bytecodes::_dup2_x1: inputs = 3; break; | |
| 999 case Bytecodes::_dup2_x2: inputs = 4; break; | |
| 1000 case Bytecodes::_swap: inputs = 2; break; | |
| 1001 case Bytecodes::_arraylength: inputs = 1; break; | |
| 1002 | |
| 1003 case Bytecodes::_getstatic: | |
| 1004 case Bytecodes::_putstatic: | |
| 1005 case Bytecodes::_getfield: | |
| 1006 case Bytecodes::_putfield: | |
| 1007 { | |
| 1008 bool is_get = (depth >= 0), is_static = (depth & 1); | |
| 1009 bool ignore; | |
| 1010 ciBytecodeStream iter(method()); | |
| 1011 iter.reset_to_bci(bci()); | |
| 1012 iter.next(); | |
| 1013 ciField* field = iter.get_field(ignore); | |
| 1014 int size = field->type()->size(); | |
| 1015 inputs = (is_static ? 0 : 1); | |
| 1016 if (is_get) { | |
| 1017 depth = size - inputs; | |
| 1018 } else { | |
| 1019 inputs += size; // putxxx pops the value from the stack | |
| 1020 depth = - inputs; | |
| 1021 } | |
| 1022 } | |
| 1023 break; | |
| 1024 | |
| 1025 case Bytecodes::_invokevirtual: | |
| 1026 case Bytecodes::_invokespecial: | |
| 1027 case Bytecodes::_invokestatic: | |
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1028 case Bytecodes::_invokedynamic: |
| 0 | 1029 case Bytecodes::_invokeinterface: |
| 1030 { | |
| 1031 bool ignore; | |
| 1032 ciBytecodeStream iter(method()); | |
| 1033 iter.reset_to_bci(bci()); | |
| 1034 iter.next(); | |
| 1035 ciMethod* method = iter.get_method(ignore); | |
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1036 // (Do not use ciMethod::arg_size(), because |
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1037 // it might be an unloaded method, which doesn't |
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1038 // know whether it is static or not.) |
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1039 inputs = method->invoke_arg_size(code); |
| 0 | 1040 int size = method->return_type()->size(); |
| 1041 depth = size - inputs; | |
| 1042 } | |
| 1043 break; | |
| 1044 | |
| 1045 case Bytecodes::_multianewarray: | |
| 1046 { | |
| 1047 ciBytecodeStream iter(method()); | |
| 1048 iter.reset_to_bci(bci()); | |
| 1049 iter.next(); | |
| 1050 inputs = iter.get_dimensions(); | |
| 1051 assert(rsize == 1, ""); | |
| 1052 depth = rsize - inputs; | |
| 1053 } | |
| 1054 break; | |
| 1055 | |
| 1056 case Bytecodes::_ireturn: | |
| 1057 case Bytecodes::_lreturn: | |
| 1058 case Bytecodes::_freturn: | |
| 1059 case Bytecodes::_dreturn: | |
| 1060 case Bytecodes::_areturn: | |
| 1061 assert(rsize = -depth, ""); | |
| 1062 inputs = rsize; | |
| 1063 break; | |
| 1064 | |
| 1065 case Bytecodes::_jsr: | |
| 1066 case Bytecodes::_jsr_w: | |
| 1067 inputs = 0; | |
| 1068 depth = 1; // S.B. depth=1, not zero | |
| 1069 break; | |
| 1070 | |
| 1071 default: | |
| 1072 // bytecode produces a typed result | |
| 1073 inputs = rsize - depth; | |
| 1074 assert(inputs >= 0, ""); | |
| 1075 break; | |
| 1076 } | |
| 1077 | |
| 1078 #ifdef ASSERT | |
| 1079 // spot check | |
| 1080 int outputs = depth + inputs; | |
| 1081 assert(outputs >= 0, "sanity"); | |
| 1082 switch (code) { | |
| 1083 case Bytecodes::_checkcast: assert(inputs == 1 && outputs == 1, ""); break; | |
| 1084 case Bytecodes::_athrow: assert(inputs == 1 && outputs == 0, ""); break; | |
| 1085 case Bytecodes::_aload_0: assert(inputs == 0 && outputs == 1, ""); break; | |
| 1086 case Bytecodes::_return: assert(inputs == 0 && outputs == 0, ""); break; | |
| 1087 case Bytecodes::_drem: assert(inputs == 4 && outputs == 2, ""); break; | |
| 1088 } | |
| 1089 #endif //ASSERT | |
| 1090 | |
| 1091 return true; | |
| 1092 } | |
| 1093 | |
| 1094 | |
| 1095 | |
| 1096 //------------------------------basic_plus_adr--------------------------------- | |
| 1097 Node* GraphKit::basic_plus_adr(Node* base, Node* ptr, Node* offset) { | |
| 1098 // short-circuit a common case | |
| 1099 if (offset == intcon(0)) return ptr; | |
| 1100 return _gvn.transform( new (C, 4) AddPNode(base, ptr, offset) ); | |
| 1101 } | |
| 1102 | |
| 1103 Node* GraphKit::ConvI2L(Node* offset) { | |
| 1104 // short-circuit a common case | |
| 1105 jint offset_con = find_int_con(offset, Type::OffsetBot); | |
| 1106 if (offset_con != Type::OffsetBot) { | |
| 1107 return longcon((long) offset_con); | |
| 1108 } | |
| 1109 return _gvn.transform( new (C, 2) ConvI2LNode(offset)); | |
| 1110 } | |
| 1111 Node* GraphKit::ConvL2I(Node* offset) { | |
| 1112 // short-circuit a common case | |
| 1113 jlong offset_con = find_long_con(offset, (jlong)Type::OffsetBot); | |
| 1114 if (offset_con != (jlong)Type::OffsetBot) { | |
| 1115 return intcon((int) offset_con); | |
| 1116 } | |
| 1117 return _gvn.transform( new (C, 2) ConvL2INode(offset)); | |
| 1118 } | |
| 1119 | |
| 1120 //-------------------------load_object_klass----------------------------------- | |
| 1121 Node* GraphKit::load_object_klass(Node* obj) { | |
| 1122 // Special-case a fresh allocation to avoid building nodes: | |
| 1123 Node* akls = AllocateNode::Ideal_klass(obj, &_gvn); | |
| 1124 if (akls != NULL) return akls; | |
| 1125 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); | |
|
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1126 return _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), k_adr, TypeInstPtr::KLASS) ); |
| 0 | 1127 } |
| 1128 | |
| 1129 //-------------------------load_array_length----------------------------------- | |
| 1130 Node* GraphKit::load_array_length(Node* array) { | |
| 1131 // Special-case a fresh allocation to avoid building nodes: | |
|
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1132 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(array, &_gvn); |
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1133 Node *alen; |
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1134 if (alloc == NULL) { |
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1135 Node *r_adr = basic_plus_adr(array, arrayOopDesc::length_offset_in_bytes()); |
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1136 alen = _gvn.transform( new (C, 3) LoadRangeNode(0, immutable_memory(), r_adr, TypeInt::POS)); |
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1137 } else { |
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1138 alen = alloc->Ideal_length(); |
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1139 Node* ccast = alloc->make_ideal_length(_gvn.type(array)->is_oopptr(), &_gvn); |
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1140 if (ccast != alen) { |
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1141 alen = _gvn.transform(ccast); |
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1142 } |
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1143 } |
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1144 return alen; |
| 0 | 1145 } |
| 1146 | |
| 1147 //------------------------------do_null_check---------------------------------- | |
| 1148 // Helper function to do a NULL pointer check. Returned value is | |
| 1149 // the incoming address with NULL casted away. You are allowed to use the | |
| 1150 // not-null value only if you are control dependent on the test. | |
| 1151 extern int explicit_null_checks_inserted, | |
| 1152 explicit_null_checks_elided; | |
| 1153 Node* GraphKit::null_check_common(Node* value, BasicType type, | |
| 1154 // optional arguments for variations: | |
| 1155 bool assert_null, | |
| 1156 Node* *null_control) { | |
| 1157 assert(!assert_null || null_control == NULL, "not both at once"); | |
| 1158 if (stopped()) return top(); | |
| 1159 if (!GenerateCompilerNullChecks && !assert_null && null_control == NULL) { | |
| 1160 // For some performance testing, we may wish to suppress null checking. | |
| 1161 value = cast_not_null(value); // Make it appear to be non-null (4962416). | |
| 1162 return value; | |
| 1163 } | |
| 1164 explicit_null_checks_inserted++; | |
| 1165 | |
| 1166 // Construct NULL check | |
| 1167 Node *chk = NULL; | |
| 1168 switch(type) { | |
| 1169 case T_LONG : chk = new (C, 3) CmpLNode(value, _gvn.zerocon(T_LONG)); break; | |
| 1170 case T_INT : chk = new (C, 3) CmpINode( value, _gvn.intcon(0)); break; | |
| 1171 case T_ARRAY : // fall through | |
| 1172 type = T_OBJECT; // simplify further tests | |
| 1173 case T_OBJECT : { | |
| 1174 const Type *t = _gvn.type( value ); | |
| 1175 | |
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1176 const TypeOopPtr* tp = t->isa_oopptr(); |
| 955 | 1177 if (tp != NULL && tp->klass() != NULL && !tp->klass()->is_loaded() |
| 0 | 1178 // Only for do_null_check, not any of its siblings: |
| 1179 && !assert_null && null_control == NULL) { | |
| 1180 // Usually, any field access or invocation on an unloaded oop type | |
| 1181 // will simply fail to link, since the statically linked class is | |
| 1182 // likely also to be unloaded. However, in -Xcomp mode, sometimes | |
| 1183 // the static class is loaded but the sharper oop type is not. | |
| 1184 // Rather than checking for this obscure case in lots of places, | |
| 1185 // we simply observe that a null check on an unloaded class | |
| 1186 // will always be followed by a nonsense operation, so we | |
| 1187 // can just issue the uncommon trap here. | |
| 1188 // Our access to the unloaded class will only be correct | |
| 1189 // after it has been loaded and initialized, which requires | |
| 1190 // a trip through the interpreter. | |
| 1191 #ifndef PRODUCT | |
| 1192 if (WizardMode) { tty->print("Null check of unloaded "); tp->klass()->print(); tty->cr(); } | |
| 1193 #endif | |
| 1194 uncommon_trap(Deoptimization::Reason_unloaded, | |
| 1195 Deoptimization::Action_reinterpret, | |
| 1196 tp->klass(), "!loaded"); | |
| 1197 return top(); | |
| 1198 } | |
| 1199 | |
| 1200 if (assert_null) { | |
| 1201 // See if the type is contained in NULL_PTR. | |
| 1202 // If so, then the value is already null. | |
| 1203 if (t->higher_equal(TypePtr::NULL_PTR)) { | |
| 1204 explicit_null_checks_elided++; | |
| 1205 return value; // Elided null assert quickly! | |
| 1206 } | |
| 1207 } else { | |
| 1208 // See if mixing in the NULL pointer changes type. | |
| 1209 // If so, then the NULL pointer was not allowed in the original | |
| 1210 // type. In other words, "value" was not-null. | |
| 1211 if (t->meet(TypePtr::NULL_PTR) != t) { | |
| 1212 // same as: if (!TypePtr::NULL_PTR->higher_equal(t)) ... | |
| 1213 explicit_null_checks_elided++; | |
| 1214 return value; // Elided null check quickly! | |
| 1215 } | |
| 1216 } | |
| 1217 chk = new (C, 3) CmpPNode( value, null() ); | |
| 1218 break; | |
| 1219 } | |
| 1220 | |
| 1221 default : ShouldNotReachHere(); | |
| 1222 } | |
| 1223 assert(chk != NULL, "sanity check"); | |
| 1224 chk = _gvn.transform(chk); | |
| 1225 | |
| 1226 BoolTest::mask btest = assert_null ? BoolTest::eq : BoolTest::ne; | |
| 1227 BoolNode *btst = new (C, 2) BoolNode( chk, btest); | |
| 1228 Node *tst = _gvn.transform( btst ); | |
| 1229 | |
| 1230 //----------- | |
| 605 | 1231 // if peephole optimizations occurred, a prior test existed. |
| 0 | 1232 // If a prior test existed, maybe it dominates as we can avoid this test. |
| 1233 if (tst != btst && type == T_OBJECT) { | |
| 1234 // At this point we want to scan up the CFG to see if we can | |
| 1235 // find an identical test (and so avoid this test altogether). | |
| 1236 Node *cfg = control(); | |
| 1237 int depth = 0; | |
| 1238 while( depth < 16 ) { // Limit search depth for speed | |
| 1239 if( cfg->Opcode() == Op_IfTrue && | |
| 1240 cfg->in(0)->in(1) == tst ) { | |
| 1241 // Found prior test. Use "cast_not_null" to construct an identical | |
| 1242 // CastPP (and hence hash to) as already exists for the prior test. | |
| 1243 // Return that casted value. | |
| 1244 if (assert_null) { | |
| 1245 replace_in_map(value, null()); | |
| 1246 return null(); // do not issue the redundant test | |
| 1247 } | |
| 1248 Node *oldcontrol = control(); | |
| 1249 set_control(cfg); | |
| 1250 Node *res = cast_not_null(value); | |
| 1251 set_control(oldcontrol); | |
| 1252 explicit_null_checks_elided++; | |
| 1253 return res; | |
| 1254 } | |
| 1255 cfg = IfNode::up_one_dom(cfg, /*linear_only=*/ true); | |
| 1256 if (cfg == NULL) break; // Quit at region nodes | |
| 1257 depth++; | |
| 1258 } | |
| 1259 } | |
| 1260 | |
| 1261 //----------- | |
| 1262 // Branch to failure if null | |
| 1263 float ok_prob = PROB_MAX; // a priori estimate: nulls never happen | |
| 1264 Deoptimization::DeoptReason reason; | |
| 1265 if (assert_null) | |
| 1266 reason = Deoptimization::Reason_null_assert; | |
| 1267 else if (type == T_OBJECT) | |
| 1268 reason = Deoptimization::Reason_null_check; | |
| 1269 else | |
| 1270 reason = Deoptimization::Reason_div0_check; | |
| 1271 | |
|
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1272 // %%% Since Reason_unhandled is not recorded on a per-bytecode basis, |
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1273 // ciMethodData::has_trap_at will return a conservative -1 if any |
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1274 // must-be-null assertion has failed. This could cause performance |
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1275 // problems for a method after its first do_null_assert failure. |
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1276 // Consider using 'Reason_class_check' instead? |
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1277 |
| 0 | 1278 // To cause an implicit null check, we set the not-null probability |
| 605 | 1279 // to the maximum (PROB_MAX). For an explicit check the probability |
| 0 | 1280 // is set to a smaller value. |
| 1281 if (null_control != NULL || too_many_traps(reason)) { | |
| 1282 // probability is less likely | |
| 1283 ok_prob = PROB_LIKELY_MAG(3); | |
| 1284 } else if (!assert_null && | |
| 1285 (ImplicitNullCheckThreshold > 0) && | |
| 1286 method() != NULL && | |
| 1287 (method()->method_data()->trap_count(reason) | |
| 1288 >= (uint)ImplicitNullCheckThreshold)) { | |
| 1289 ok_prob = PROB_LIKELY_MAG(3); | |
| 1290 } | |
| 1291 | |
| 1292 if (null_control != NULL) { | |
| 1293 IfNode* iff = create_and_map_if(control(), tst, ok_prob, COUNT_UNKNOWN); | |
| 1294 Node* null_true = _gvn.transform( new (C, 1) IfFalseNode(iff)); | |
| 1295 set_control( _gvn.transform( new (C, 1) IfTrueNode(iff))); | |
| 1296 if (null_true == top()) | |
| 1297 explicit_null_checks_elided++; | |
| 1298 (*null_control) = null_true; | |
| 1299 } else { | |
| 1300 BuildCutout unless(this, tst, ok_prob); | |
| 1301 // Check for optimizer eliding test at parse time | |
| 1302 if (stopped()) { | |
| 1303 // Failure not possible; do not bother making uncommon trap. | |
| 1304 explicit_null_checks_elided++; | |
| 1305 } else if (assert_null) { | |
| 1306 uncommon_trap(reason, | |
| 1307 Deoptimization::Action_make_not_entrant, | |
| 1308 NULL, "assert_null"); | |
| 1309 } else { | |
| 332 | 1310 replace_in_map(value, zerocon(type)); |
| 0 | 1311 builtin_throw(reason); |
| 1312 } | |
| 1313 } | |
| 1314 | |
| 1315 // Must throw exception, fall-thru not possible? | |
| 1316 if (stopped()) { | |
| 1317 return top(); // No result | |
| 1318 } | |
| 1319 | |
| 1320 if (assert_null) { | |
| 1321 // Cast obj to null on this path. | |
| 1322 replace_in_map(value, zerocon(type)); | |
| 1323 return zerocon(type); | |
| 1324 } | |
| 1325 | |
| 1326 // Cast obj to not-null on this path, if there is no null_control. | |
| 1327 // (If there is a null_control, a non-null value may come back to haunt us.) | |
| 1328 if (type == T_OBJECT) { | |
| 1329 Node* cast = cast_not_null(value, false); | |
| 1330 if (null_control == NULL || (*null_control) == top()) | |
| 1331 replace_in_map(value, cast); | |
| 1332 value = cast; | |
| 1333 } | |
| 1334 | |
| 1335 return value; | |
| 1336 } | |
| 1337 | |
| 1338 | |
| 1339 //------------------------------cast_not_null---------------------------------- | |
| 1340 // Cast obj to not-null on this path | |
| 1341 Node* GraphKit::cast_not_null(Node* obj, bool do_replace_in_map) { | |
| 1342 const Type *t = _gvn.type(obj); | |
| 1343 const Type *t_not_null = t->join(TypePtr::NOTNULL); | |
| 1344 // Object is already not-null? | |
| 1345 if( t == t_not_null ) return obj; | |
| 1346 | |
| 1347 Node *cast = new (C, 2) CastPPNode(obj,t_not_null); | |
| 1348 cast->init_req(0, control()); | |
| 1349 cast = _gvn.transform( cast ); | |
| 1350 | |
| 1351 // Scan for instances of 'obj' in the current JVM mapping. | |
| 1352 // These instances are known to be not-null after the test. | |
| 1353 if (do_replace_in_map) | |
| 1354 replace_in_map(obj, cast); | |
| 1355 | |
| 1356 return cast; // Return casted value | |
| 1357 } | |
| 1358 | |
| 1359 | |
| 1360 //--------------------------replace_in_map------------------------------------- | |
| 1361 void GraphKit::replace_in_map(Node* old, Node* neww) { | |
| 1362 this->map()->replace_edge(old, neww); | |
| 1363 | |
| 1364 // Note: This operation potentially replaces any edge | |
| 1365 // on the map. This includes locals, stack, and monitors | |
| 1366 // of the current (innermost) JVM state. | |
| 1367 | |
| 1368 // We can consider replacing in caller maps. | |
| 1369 // The idea would be that an inlined function's null checks | |
| 1370 // can be shared with the entire inlining tree. | |
| 1371 // The expense of doing this is that the PreserveJVMState class | |
| 1372 // would have to preserve caller states too, with a deep copy. | |
| 1373 } | |
| 1374 | |
| 1375 | |
| 1376 | |
| 1377 //============================================================================= | |
| 1378 //--------------------------------memory--------------------------------------- | |
| 1379 Node* GraphKit::memory(uint alias_idx) { | |
| 1380 MergeMemNode* mem = merged_memory(); | |
| 1381 Node* p = mem->memory_at(alias_idx); | |
| 1382 _gvn.set_type(p, Type::MEMORY); // must be mapped | |
| 1383 return p; | |
| 1384 } | |
| 1385 | |
| 1386 //-----------------------------reset_memory------------------------------------ | |
| 1387 Node* GraphKit::reset_memory() { | |
| 1388 Node* mem = map()->memory(); | |
| 1389 // do not use this node for any more parsing! | |
| 1390 debug_only( map()->set_memory((Node*)NULL) ); | |
| 1391 return _gvn.transform( mem ); | |
| 1392 } | |
| 1393 | |
| 1394 //------------------------------set_all_memory--------------------------------- | |
| 1395 void GraphKit::set_all_memory(Node* newmem) { | |
| 1396 Node* mergemem = MergeMemNode::make(C, newmem); | |
| 1397 gvn().set_type_bottom(mergemem); | |
| 1398 map()->set_memory(mergemem); | |
| 1399 } | |
| 1400 | |
| 1401 //------------------------------set_all_memory_call---------------------------- | |
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1402 void GraphKit::set_all_memory_call(Node* call, bool separate_io_proj) { |
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1403 Node* newmem = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory, separate_io_proj) ); |
| 0 | 1404 set_all_memory(newmem); |
| 1405 } | |
| 1406 | |
| 1407 //============================================================================= | |
| 1408 // | |
| 1409 // parser factory methods for MemNodes | |
| 1410 // | |
| 1411 // These are layered on top of the factory methods in LoadNode and StoreNode, | |
| 1412 // and integrate with the parser's memory state and _gvn engine. | |
| 1413 // | |
| 1414 | |
| 1415 // factory methods in "int adr_idx" | |
| 1416 Node* GraphKit::make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, | |
| 1417 int adr_idx, | |
| 1418 bool require_atomic_access) { | |
| 1419 assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" ); | |
| 1420 const TypePtr* adr_type = NULL; // debug-mode-only argument | |
| 1421 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
| 1422 Node* mem = memory(adr_idx); | |
| 1423 Node* ld; | |
| 1424 if (require_atomic_access && bt == T_LONG) { | |
| 1425 ld = LoadLNode::make_atomic(C, ctl, mem, adr, adr_type, t); | |
| 1426 } else { | |
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1427 ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt); |
| 0 | 1428 } |
| 1429 return _gvn.transform(ld); | |
| 1430 } | |
| 1431 | |
| 1432 Node* GraphKit::store_to_memory(Node* ctl, Node* adr, Node *val, BasicType bt, | |
| 1433 int adr_idx, | |
| 1434 bool require_atomic_access) { | |
| 1435 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); | |
| 1436 const TypePtr* adr_type = NULL; | |
| 1437 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
| 1438 Node *mem = memory(adr_idx); | |
| 1439 Node* st; | |
| 1440 if (require_atomic_access && bt == T_LONG) { | |
| 1441 st = StoreLNode::make_atomic(C, ctl, mem, adr, adr_type, val); | |
| 1442 } else { | |
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1443 st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt); |
| 0 | 1444 } |
| 1445 st = _gvn.transform(st); | |
| 1446 set_memory(st, adr_idx); | |
| 1447 // Back-to-back stores can only remove intermediate store with DU info | |
| 1448 // so push on worklist for optimizer. | |
| 1449 if (mem->req() > MemNode::Address && adr == mem->in(MemNode::Address)) | |
| 1450 record_for_igvn(st); | |
| 1451 | |
| 1452 return st; | |
| 1453 } | |
| 1454 | |
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1455 |
| 0 | 1456 void GraphKit::pre_barrier(Node* ctl, |
| 1457 Node* obj, | |
| 1458 Node* adr, | |
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1459 uint adr_idx, |
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1460 Node* val, |
| 825 | 1461 const TypeOopPtr* val_type, |
| 0 | 1462 BasicType bt) { |
| 1463 BarrierSet* bs = Universe::heap()->barrier_set(); | |
| 1464 set_control(ctl); | |
| 1465 switch (bs->kind()) { | |
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1466 case BarrierSet::G1SATBCT: |
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1467 case BarrierSet::G1SATBCTLogging: |
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1468 g1_write_barrier_pre(obj, adr, adr_idx, val, val_type, bt); |
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1469 break; |
| 0 | 1470 |
| 1471 case BarrierSet::CardTableModRef: | |
| 1472 case BarrierSet::CardTableExtension: | |
| 1473 case BarrierSet::ModRef: | |
| 1474 break; | |
| 1475 | |
| 1476 case BarrierSet::Other: | |
| 1477 default : | |
| 1478 ShouldNotReachHere(); | |
| 1479 | |
| 1480 } | |
| 1481 } | |
| 1482 | |
| 1483 void GraphKit::post_barrier(Node* ctl, | |
| 1484 Node* store, | |
| 1485 Node* obj, | |
| 1486 Node* adr, | |
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1487 uint adr_idx, |
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1488 Node* val, |
| 0 | 1489 BasicType bt, |
| 1490 bool use_precise) { | |
| 1491 BarrierSet* bs = Universe::heap()->barrier_set(); | |
| 1492 set_control(ctl); | |
| 1493 switch (bs->kind()) { | |
|
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1494 case BarrierSet::G1SATBCT: |
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1495 case BarrierSet::G1SATBCTLogging: |
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1496 g1_write_barrier_post(store, obj, adr, adr_idx, val, bt, use_precise); |
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1497 break; |
| 0 | 1498 |
| 1499 case BarrierSet::CardTableModRef: | |
| 1500 case BarrierSet::CardTableExtension: | |
|
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1501 write_barrier_post(store, obj, adr, adr_idx, val, use_precise); |
| 0 | 1502 break; |
| 1503 | |
| 1504 case BarrierSet::ModRef: | |
| 1505 break; | |
| 1506 | |
| 1507 case BarrierSet::Other: | |
| 1508 default : | |
| 1509 ShouldNotReachHere(); | |
| 1510 | |
| 1511 } | |
| 1512 } | |
| 1513 | |
|
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1514 Node* GraphKit::store_oop(Node* ctl, |
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1515 Node* obj, |
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1516 Node* adr, |
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1517 const TypePtr* adr_type, |
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1518 Node* val, |
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1519 const TypeOopPtr* val_type, |
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1520 BasicType bt, |
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1521 bool use_precise) { |
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1522 |
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1523 set_control(ctl); |
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1524 if (stopped()) return top(); // Dead path ? |
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1525 |
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1526 assert(bt == T_OBJECT, "sanity"); |
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1527 assert(val != NULL, "not dead path"); |
| 0 | 1528 uint adr_idx = C->get_alias_index(adr_type); |
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1529 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); |
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1530 |
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1531 pre_barrier(control(), obj, adr, adr_idx, val, val_type, bt); |
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1532 Node* store = store_to_memory(control(), adr, val, bt, adr_idx); |
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1533 post_barrier(control(), store, obj, adr, adr_idx, val, bt, use_precise); |
| 0 | 1534 return store; |
| 1535 } | |
| 1536 | |
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1537 // Could be an array or object we don't know at compile time (unsafe ref.) |
| 0 | 1538 Node* GraphKit::store_oop_to_unknown(Node* ctl, |
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1539 Node* obj, // containing obj |
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1540 Node* adr, // actual adress to store val at |
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1541 const TypePtr* adr_type, |
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1542 Node* val, |
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1543 BasicType bt) { |
| 825 | 1544 Compile::AliasType* at = C->alias_type(adr_type); |
| 1545 const TypeOopPtr* val_type = NULL; | |
| 1546 if (adr_type->isa_instptr()) { | |
| 1547 if (at->field() != NULL) { | |
| 1548 // known field. This code is a copy of the do_put_xxx logic. | |
| 1549 ciField* field = at->field(); | |
| 1550 if (!field->type()->is_loaded()) { | |
| 1551 val_type = TypeInstPtr::BOTTOM; | |
| 1552 } else { | |
| 1553 val_type = TypeOopPtr::make_from_klass(field->type()->as_klass()); | |
| 1554 } | |
| 1555 } | |
| 1556 } else if (adr_type->isa_aryptr()) { | |
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1557 val_type = adr_type->is_aryptr()->elem()->make_oopptr(); |
| 825 | 1558 } |
| 1559 if (val_type == NULL) { | |
| 1560 val_type = TypeInstPtr::BOTTOM; | |
| 1561 } | |
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1562 return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, true); |
| 0 | 1563 } |
| 1564 | |
| 1565 | |
| 1566 //-------------------------array_element_address------------------------- | |
| 1567 Node* GraphKit::array_element_address(Node* ary, Node* idx, BasicType elembt, | |
| 1568 const TypeInt* sizetype) { | |
|
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1569 uint shift = exact_log2(type2aelembytes(elembt)); |
| 0 | 1570 uint header = arrayOopDesc::base_offset_in_bytes(elembt); |
| 1571 | |
| 1572 // short-circuit a common case (saves lots of confusing waste motion) | |
| 1573 jint idx_con = find_int_con(idx, -1); | |
| 1574 if (idx_con >= 0) { | |
| 1575 intptr_t offset = header + ((intptr_t)idx_con << shift); | |
| 1576 return basic_plus_adr(ary, offset); | |
| 1577 } | |
| 1578 | |
| 1579 // must be correct type for alignment purposes | |
| 1580 Node* base = basic_plus_adr(ary, header); | |
| 1581 #ifdef _LP64 | |
| 1582 // The scaled index operand to AddP must be a clean 64-bit value. | |
| 1583 // Java allows a 32-bit int to be incremented to a negative | |
| 1584 // value, which appears in a 64-bit register as a large | |
| 1585 // positive number. Using that large positive number as an | |
| 1586 // operand in pointer arithmetic has bad consequences. | |
| 1587 // On the other hand, 32-bit overflow is rare, and the possibility | |
| 1588 // can often be excluded, if we annotate the ConvI2L node with | |
| 1589 // a type assertion that its value is known to be a small positive | |
| 1590 // number. (The prior range check has ensured this.) | |
| 1591 // This assertion is used by ConvI2LNode::Ideal. | |
| 1592 int index_max = max_jint - 1; // array size is max_jint, index is one less | |
| 1593 if (sizetype != NULL) index_max = sizetype->_hi - 1; | |
| 1594 const TypeLong* lidxtype = TypeLong::make(CONST64(0), index_max, Type::WidenMax); | |
| 1595 idx = _gvn.transform( new (C, 2) ConvI2LNode(idx, lidxtype) ); | |
| 1596 #endif | |
| 1597 Node* scale = _gvn.transform( new (C, 3) LShiftXNode(idx, intcon(shift)) ); | |
| 1598 return basic_plus_adr(ary, base, scale); | |
| 1599 } | |
| 1600 | |
| 1601 //-------------------------load_array_element------------------------- | |
| 1602 Node* GraphKit::load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype) { | |
| 1603 const Type* elemtype = arytype->elem(); | |
| 1604 BasicType elembt = elemtype->array_element_basic_type(); | |
| 1605 Node* adr = array_element_address(ary, idx, elembt, arytype->size()); | |
| 1606 Node* ld = make_load(ctl, adr, elemtype, elembt, arytype); | |
| 1607 return ld; | |
| 1608 } | |
| 1609 | |
| 1610 //-------------------------set_arguments_for_java_call------------------------- | |
| 1611 // Arguments (pre-popped from the stack) are taken from the JVMS. | |
| 1612 void GraphKit::set_arguments_for_java_call(CallJavaNode* call) { | |
| 1613 // Add the call arguments: | |
| 1614 uint nargs = call->method()->arg_size(); | |
| 1615 for (uint i = 0; i < nargs; i++) { | |
| 1616 Node* arg = argument(i); | |
| 1617 call->init_req(i + TypeFunc::Parms, arg); | |
| 1618 } | |
| 1619 } | |
| 1620 | |
| 1621 //---------------------------set_edges_for_java_call--------------------------- | |
| 1622 // Connect a newly created call into the current JVMS. | |
| 1623 // A return value node (if any) is returned from set_edges_for_java_call. | |
|
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1624 void GraphKit::set_edges_for_java_call(CallJavaNode* call, bool must_throw, bool separate_io_proj) { |
| 0 | 1625 |
| 1626 // Add the predefined inputs: | |
| 1627 call->init_req( TypeFunc::Control, control() ); | |
| 1628 call->init_req( TypeFunc::I_O , i_o() ); | |
| 1629 call->init_req( TypeFunc::Memory , reset_memory() ); | |
| 1630 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
| 1631 call->init_req( TypeFunc::ReturnAdr, top() ); | |
| 1632 | |
| 1633 add_safepoint_edges(call, must_throw); | |
| 1634 | |
| 1635 Node* xcall = _gvn.transform(call); | |
| 1636 | |
| 1637 if (xcall == top()) { | |
| 1638 set_control(top()); | |
| 1639 return; | |
| 1640 } | |
| 1641 assert(xcall == call, "call identity is stable"); | |
| 1642 | |
| 1643 // Re-use the current map to produce the result. | |
| 1644 | |
| 1645 set_control(_gvn.transform(new (C, 1) ProjNode(call, TypeFunc::Control))); | |
|
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1646 set_i_o( _gvn.transform(new (C, 1) ProjNode(call, TypeFunc::I_O , separate_io_proj))); |
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1647 set_all_memory_call(xcall, separate_io_proj); |
| 0 | 1648 |
| 1649 //return xcall; // no need, caller already has it | |
| 1650 } | |
| 1651 | |
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1652 Node* GraphKit::set_results_for_java_call(CallJavaNode* call, bool separate_io_proj) { |
| 0 | 1653 if (stopped()) return top(); // maybe the call folded up? |
| 1654 | |
| 1655 // Capture the return value, if any. | |
| 1656 Node* ret; | |
| 1657 if (call->method() == NULL || | |
| 1658 call->method()->return_type()->basic_type() == T_VOID) | |
| 1659 ret = top(); | |
| 1660 else ret = _gvn.transform(new (C, 1) ProjNode(call, TypeFunc::Parms)); | |
| 1661 | |
| 1662 // Note: Since any out-of-line call can produce an exception, | |
| 1663 // we always insert an I_O projection from the call into the result. | |
| 1664 | |
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1665 make_slow_call_ex(call, env()->Throwable_klass(), separate_io_proj); |
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1666 |
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1667 if (separate_io_proj) { |
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1668 // The caller requested separate projections be used by the fall |
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1669 // through and exceptional paths, so replace the projections for |
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1670 // the fall through path. |
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1671 set_i_o(_gvn.transform( new (C, 1) ProjNode(call, TypeFunc::I_O) )); |
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1672 set_all_memory(_gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory) )); |
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1673 } |
| 0 | 1674 return ret; |
| 1675 } | |
| 1676 | |
| 1677 //--------------------set_predefined_input_for_runtime_call-------------------- | |
| 1678 // Reading and setting the memory state is way conservative here. | |
| 1679 // The real problem is that I am not doing real Type analysis on memory, | |
| 1680 // so I cannot distinguish card mark stores from other stores. Across a GC | |
| 1681 // point the Store Barrier and the card mark memory has to agree. I cannot | |
| 1682 // have a card mark store and its barrier split across the GC point from | |
| 1683 // either above or below. Here I get that to happen by reading ALL of memory. | |
| 1684 // A better answer would be to separate out card marks from other memory. | |
| 1685 // For now, return the input memory state, so that it can be reused | |
| 1686 // after the call, if this call has restricted memory effects. | |
| 1687 Node* GraphKit::set_predefined_input_for_runtime_call(SafePointNode* call) { | |
| 1688 // Set fixed predefined input arguments | |
| 1689 Node* memory = reset_memory(); | |
| 1690 call->init_req( TypeFunc::Control, control() ); | |
| 1691 call->init_req( TypeFunc::I_O, top() ); // does no i/o | |
| 1692 call->init_req( TypeFunc::Memory, memory ); // may gc ptrs | |
| 1693 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
| 1694 call->init_req( TypeFunc::ReturnAdr, top() ); | |
| 1695 return memory; | |
| 1696 } | |
| 1697 | |
| 1698 //-------------------set_predefined_output_for_runtime_call-------------------- | |
| 1699 // Set control and memory (not i_o) from the call. | |
| 1700 // If keep_mem is not NULL, use it for the output state, | |
| 1701 // except for the RawPtr output of the call, if hook_mem is TypeRawPtr::BOTTOM. | |
| 1702 // If hook_mem is NULL, this call produces no memory effects at all. | |
| 1703 // If hook_mem is a Java-visible memory slice (such as arraycopy operands), | |
| 1704 // then only that memory slice is taken from the call. | |
| 1705 // In the last case, we must put an appropriate memory barrier before | |
| 1706 // the call, so as to create the correct anti-dependencies on loads | |
| 1707 // preceding the call. | |
| 1708 void GraphKit::set_predefined_output_for_runtime_call(Node* call, | |
| 1709 Node* keep_mem, | |
| 1710 const TypePtr* hook_mem) { | |
| 1711 // no i/o | |
| 1712 set_control(_gvn.transform( new (C, 1) ProjNode(call,TypeFunc::Control) )); | |
| 1713 if (keep_mem) { | |
| 1714 // First clone the existing memory state | |
| 1715 set_all_memory(keep_mem); | |
| 1716 if (hook_mem != NULL) { | |
| 1717 // Make memory for the call | |
| 1718 Node* mem = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory) ); | |
| 1719 // Set the RawPtr memory state only. This covers all the heap top/GC stuff | |
| 1720 // We also use hook_mem to extract specific effects from arraycopy stubs. | |
| 1721 set_memory(mem, hook_mem); | |
| 1722 } | |
| 1723 // ...else the call has NO memory effects. | |
| 1724 | |
| 1725 // Make sure the call advertises its memory effects precisely. | |
| 1726 // This lets us build accurate anti-dependences in gcm.cpp. | |
| 1727 assert(C->alias_type(call->adr_type()) == C->alias_type(hook_mem), | |
| 1728 "call node must be constructed correctly"); | |
| 1729 } else { | |
| 1730 assert(hook_mem == NULL, ""); | |
| 1731 // This is not a "slow path" call; all memory comes from the call. | |
| 1732 set_all_memory_call(call); | |
| 1733 } | |
| 1734 } | |
| 1735 | |
|
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1736 |
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1737 // Replace the call with the current state of the kit. |
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1738 void GraphKit::replace_call(CallNode* call, Node* result) { |
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1739 JVMState* ejvms = NULL; |
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1740 if (has_exceptions()) { |
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1741 ejvms = transfer_exceptions_into_jvms(); |
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1742 } |
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1743 |
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1744 SafePointNode* final_state = stop(); |
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1745 |
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1746 // Find all the needed outputs of this call |
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1747 CallProjections callprojs; |
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1748 call->extract_projections(&callprojs, true); |
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1749 |
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1750 // Replace all the old call edges with the edges from the inlining result |
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1751 C->gvn_replace_by(callprojs.fallthrough_catchproj, final_state->in(TypeFunc::Control)); |
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1752 C->gvn_replace_by(callprojs.fallthrough_memproj, final_state->in(TypeFunc::Memory)); |
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1753 C->gvn_replace_by(callprojs.fallthrough_ioproj, final_state->in(TypeFunc::I_O)); |
|
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1754 Node* final_mem = final_state->in(TypeFunc::Memory); |
|
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1755 |
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1756 // Replace the result with the new result if it exists and is used |
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1757 if (callprojs.resproj != NULL && result != NULL) { |
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1758 C->gvn_replace_by(callprojs.resproj, result); |
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1759 } |
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1760 |
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1761 if (ejvms == NULL) { |
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1762 // No exception edges to simply kill off those paths |
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1763 C->gvn_replace_by(callprojs.catchall_catchproj, C->top()); |
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1764 C->gvn_replace_by(callprojs.catchall_memproj, C->top()); |
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1765 C->gvn_replace_by(callprojs.catchall_ioproj, C->top()); |
|
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1766 |
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1767 // Replace the old exception object with top |
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1768 if (callprojs.exobj != NULL) { |
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1769 C->gvn_replace_by(callprojs.exobj, C->top()); |
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1770 } |
|
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1771 } else { |
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1772 GraphKit ekit(ejvms); |
|
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1773 |
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1774 // Load my combined exception state into the kit, with all phis transformed: |
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1775 SafePointNode* ex_map = ekit.combine_and_pop_all_exception_states(); |
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1776 |
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1777 Node* ex_oop = ekit.use_exception_state(ex_map); |
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1778 |
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1779 C->gvn_replace_by(callprojs.catchall_catchproj, ekit.control()); |
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1780 C->gvn_replace_by(callprojs.catchall_memproj, ekit.reset_memory()); |
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1781 C->gvn_replace_by(callprojs.catchall_ioproj, ekit.i_o()); |
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1782 |
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1783 // Replace the old exception object with the newly created one |
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1784 if (callprojs.exobj != NULL) { |
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1785 C->gvn_replace_by(callprojs.exobj, ex_oop); |
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1786 } |
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1787 } |
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1788 |
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1789 // Disconnect the call from the graph |
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1790 call->disconnect_inputs(NULL); |
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1791 C->gvn_replace_by(call, C->top()); |
|
1786
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1792 |
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1793 // Clean up any MergeMems that feed other MergeMems since the |
|
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1794 // optimizer doesn't like that. |
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1795 if (final_mem->is_MergeMem()) { |
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1796 Node_List wl; |
|
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1797 for (SimpleDUIterator i(final_mem); i.has_next(); i.next()) { |
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1798 Node* m = i.get(); |
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1799 if (m->is_MergeMem() && !wl.contains(m)) { |
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1800 wl.push(m); |
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1801 } |
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1802 } |
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1803 while (wl.size() > 0) { |
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1804 _gvn.transform(wl.pop()); |
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1805 } |
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1806 } |
|
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1807 } |
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1808 |
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1809 |
| 0 | 1810 //------------------------------increment_counter------------------------------ |
| 1811 // for statistics: increment a VM counter by 1 | |
| 1812 | |
| 1813 void GraphKit::increment_counter(address counter_addr) { | |
| 1814 Node* adr1 = makecon(TypeRawPtr::make(counter_addr)); | |
| 1815 increment_counter(adr1); | |
| 1816 } | |
| 1817 | |
| 1818 void GraphKit::increment_counter(Node* counter_addr) { | |
| 1819 int adr_type = Compile::AliasIdxRaw; | |
| 1609 | 1820 Node* ctrl = control(); |
| 1821 Node* cnt = make_load(ctrl, counter_addr, TypeInt::INT, T_INT, adr_type); | |
| 0 | 1822 Node* incr = _gvn.transform(new (C, 3) AddINode(cnt, _gvn.intcon(1))); |
| 1609 | 1823 store_to_memory( ctrl, counter_addr, incr, T_INT, adr_type ); |
| 0 | 1824 } |
| 1825 | |
| 1826 | |
| 1827 //------------------------------uncommon_trap---------------------------------- | |
| 1828 // Bail out to the interpreter in mid-method. Implemented by calling the | |
| 1829 // uncommon_trap blob. This helper function inserts a runtime call with the | |
| 1830 // right debug info. | |
| 1831 void GraphKit::uncommon_trap(int trap_request, | |
| 1832 ciKlass* klass, const char* comment, | |
| 1833 bool must_throw, | |
| 1834 bool keep_exact_action) { | |
| 1835 if (failing()) stop(); | |
| 1836 if (stopped()) return; // trap reachable? | |
| 1837 | |
| 1838 // Note: If ProfileTraps is true, and if a deopt. actually | |
| 1839 // occurs here, the runtime will make sure an MDO exists. There is | |
|
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|
1840 // no need to call method()->ensure_method_data() at this point. |
| 0 | 1841 |
| 1842 #ifdef ASSERT | |
| 1843 if (!must_throw) { | |
| 1844 // Make sure the stack has at least enough depth to execute | |
| 1845 // the current bytecode. | |
| 1846 int inputs, ignore; | |
| 1847 if (compute_stack_effects(inputs, ignore)) { | |
| 1848 assert(sp() >= inputs, "must have enough JVMS stack to execute"); | |
| 1849 // It is a frequent error in library_call.cpp to issue an | |
| 1850 // uncommon trap with the _sp value already popped. | |
| 1851 } | |
| 1852 } | |
| 1853 #endif | |
| 1854 | |
| 1855 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request); | |
| 1856 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request); | |
| 1857 | |
| 1858 switch (action) { | |
| 1859 case Deoptimization::Action_maybe_recompile: | |
| 1860 case Deoptimization::Action_reinterpret: | |
| 1861 // Temporary fix for 6529811 to allow virtual calls to be sure they | |
| 1862 // get the chance to go from mono->bi->mega | |
| 1863 if (!keep_exact_action && | |
| 1864 Deoptimization::trap_request_index(trap_request) < 0 && | |
| 1865 too_many_recompiles(reason)) { | |
| 1866 // This BCI is causing too many recompilations. | |
| 1867 action = Deoptimization::Action_none; | |
| 1868 trap_request = Deoptimization::make_trap_request(reason, action); | |
| 1869 } else { | |
| 1870 C->set_trap_can_recompile(true); | |
| 1871 } | |
| 1872 break; | |
| 1873 case Deoptimization::Action_make_not_entrant: | |
| 1874 C->set_trap_can_recompile(true); | |
| 1875 break; | |
| 1876 #ifdef ASSERT | |
| 1877 case Deoptimization::Action_none: | |
| 1878 case Deoptimization::Action_make_not_compilable: | |
| 1879 break; | |
| 1880 default: | |
| 1881 assert(false, "bad action"); | |
| 1882 #endif | |
| 1883 } | |
| 1884 | |
| 1885 if (TraceOptoParse) { | |
| 1886 char buf[100]; | |
| 1887 tty->print_cr("Uncommon trap %s at bci:%d", | |
| 1888 Deoptimization::format_trap_request(buf, sizeof(buf), | |
| 1889 trap_request), bci()); | |
| 1890 } | |
| 1891 | |
| 1892 CompileLog* log = C->log(); | |
| 1893 if (log != NULL) { | |
| 1894 int kid = (klass == NULL)? -1: log->identify(klass); | |
| 1895 log->begin_elem("uncommon_trap bci='%d'", bci()); | |
| 1896 char buf[100]; | |
| 1897 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), | |
| 1898 trap_request)); | |
| 1899 if (kid >= 0) log->print(" klass='%d'", kid); | |
| 1900 if (comment != NULL) log->print(" comment='%s'", comment); | |
| 1901 log->end_elem(); | |
| 1902 } | |
| 1903 | |
| 1904 // Make sure any guarding test views this path as very unlikely | |
| 1905 Node *i0 = control()->in(0); | |
| 1906 if (i0 != NULL && i0->is_If()) { // Found a guarding if test? | |
| 1907 IfNode *iff = i0->as_If(); | |
| 1908 float f = iff->_prob; // Get prob | |
| 1909 if (control()->Opcode() == Op_IfTrue) { | |
| 1910 if (f > PROB_UNLIKELY_MAG(4)) | |
| 1911 iff->_prob = PROB_MIN; | |
| 1912 } else { | |
| 1913 if (f < PROB_LIKELY_MAG(4)) | |
| 1914 iff->_prob = PROB_MAX; | |
| 1915 } | |
| 1916 } | |
| 1917 | |
| 1918 // Clear out dead values from the debug info. | |
| 1919 kill_dead_locals(); | |
| 1920 | |
| 1921 // Now insert the uncommon trap subroutine call | |
| 1748 | 1922 address call_addr = SharedRuntime::uncommon_trap_blob()->entry_point(); |
| 0 | 1923 const TypePtr* no_memory_effects = NULL; |
| 1924 // Pass the index of the class to be loaded | |
| 1925 Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON | | |
| 1926 (must_throw ? RC_MUST_THROW : 0), | |
| 1927 OptoRuntime::uncommon_trap_Type(), | |
| 1928 call_addr, "uncommon_trap", no_memory_effects, | |
| 1929 intcon(trap_request)); | |
| 1930 assert(call->as_CallStaticJava()->uncommon_trap_request() == trap_request, | |
| 1931 "must extract request correctly from the graph"); | |
| 1932 assert(trap_request != 0, "zero value reserved by uncommon_trap_request"); | |
| 1933 | |
| 1934 call->set_req(TypeFunc::ReturnAdr, returnadr()); | |
| 1935 // The debug info is the only real input to this call. | |
| 1936 | |
| 1937 // Halt-and-catch fire here. The above call should never return! | |
| 1938 HaltNode* halt = new(C, TypeFunc::Parms) HaltNode(control(), frameptr()); | |
| 1939 _gvn.set_type_bottom(halt); | |
| 1940 root()->add_req(halt); | |
| 1941 | |
| 1942 stop_and_kill_map(); | |
| 1943 } | |
| 1944 | |
| 1945 | |
| 1946 //--------------------------just_allocated_object------------------------------ | |
| 1947 // Report the object that was just allocated. | |
| 1948 // It must be the case that there are no intervening safepoints. | |
| 1949 // We use this to determine if an object is so "fresh" that | |
| 1950 // it does not require card marks. | |
| 1951 Node* GraphKit::just_allocated_object(Node* current_control) { | |
| 1952 if (C->recent_alloc_ctl() == current_control) | |
| 1953 return C->recent_alloc_obj(); | |
| 1954 return NULL; | |
| 1955 } | |
| 1956 | |
| 1957 | |
| 1958 void GraphKit::round_double_arguments(ciMethod* dest_method) { | |
| 1959 // (Note: TypeFunc::make has a cache that makes this fast.) | |
| 1960 const TypeFunc* tf = TypeFunc::make(dest_method); | |
| 1961 int nargs = tf->_domain->_cnt - TypeFunc::Parms; | |
| 1962 for (int j = 0; j < nargs; j++) { | |
| 1963 const Type *targ = tf->_domain->field_at(j + TypeFunc::Parms); | |
| 1964 if( targ->basic_type() == T_DOUBLE ) { | |
| 1965 // If any parameters are doubles, they must be rounded before | |
| 1966 // the call, dstore_rounding does gvn.transform | |
| 1967 Node *arg = argument(j); | |
| 1968 arg = dstore_rounding(arg); | |
| 1969 set_argument(j, arg); | |
| 1970 } | |
| 1971 } | |
| 1972 } | |
| 1973 | |
| 1974 void GraphKit::round_double_result(ciMethod* dest_method) { | |
| 1975 // A non-strict method may return a double value which has an extended | |
| 1976 // exponent, but this must not be visible in a caller which is 'strict' | |
| 1977 // If a strict caller invokes a non-strict callee, round a double result | |
| 1978 | |
| 1979 BasicType result_type = dest_method->return_type()->basic_type(); | |
| 1980 assert( method() != NULL, "must have caller context"); | |
| 1981 if( result_type == T_DOUBLE && method()->is_strict() && !dest_method->is_strict() ) { | |
| 1982 // Destination method's return value is on top of stack | |
| 1983 // dstore_rounding() does gvn.transform | |
| 1984 Node *result = pop_pair(); | |
| 1985 result = dstore_rounding(result); | |
| 1986 push_pair(result); | |
| 1987 } | |
| 1988 } | |
| 1989 | |
| 1990 // rounding for strict float precision conformance | |
| 1991 Node* GraphKit::precision_rounding(Node* n) { | |
| 1992 return UseStrictFP && _method->flags().is_strict() | |
| 1993 && UseSSE == 0 && Matcher::strict_fp_requires_explicit_rounding | |
| 1994 ? _gvn.transform( new (C, 2) RoundFloatNode(0, n) ) | |
| 1995 : n; | |
| 1996 } | |
| 1997 | |
| 1998 // rounding for strict double precision conformance | |
| 1999 Node* GraphKit::dprecision_rounding(Node *n) { | |
| 2000 return UseStrictFP && _method->flags().is_strict() | |
| 2001 && UseSSE <= 1 && Matcher::strict_fp_requires_explicit_rounding | |
| 2002 ? _gvn.transform( new (C, 2) RoundDoubleNode(0, n) ) | |
| 2003 : n; | |
| 2004 } | |
| 2005 | |
| 2006 // rounding for non-strict double stores | |
| 2007 Node* GraphKit::dstore_rounding(Node* n) { | |
| 2008 return Matcher::strict_fp_requires_explicit_rounding | |
| 2009 && UseSSE <= 1 | |
| 2010 ? _gvn.transform( new (C, 2) RoundDoubleNode(0, n) ) | |
| 2011 : n; | |
| 2012 } | |
| 2013 | |
| 2014 //============================================================================= | |
| 2015 // Generate a fast path/slow path idiom. Graph looks like: | |
| 2016 // [foo] indicates that 'foo' is a parameter | |
| 2017 // | |
| 2018 // [in] NULL | |
| 2019 // \ / | |
| 2020 // CmpP | |
| 2021 // Bool ne | |
| 2022 // If | |
| 2023 // / \ | |
| 2024 // True False-<2> | |
| 2025 // / | | |
| 2026 // / cast_not_null | |
| 2027 // Load | | ^ | |
| 2028 // [fast_test] | | | |
| 2029 // gvn to opt_test | | | |
| 2030 // / \ | <1> | |
| 2031 // True False | | |
| 2032 // | \\ | | |
| 2033 // [slow_call] \[fast_result] | |
| 2034 // Ctl Val \ \ | |
| 2035 // | \ \ | |
| 2036 // Catch <1> \ \ | |
| 2037 // / \ ^ \ \ | |
| 2038 // Ex No_Ex | \ \ | |
| 2039 // | \ \ | \ <2> \ | |
| 2040 // ... \ [slow_res] | | \ [null_result] | |
| 2041 // \ \--+--+--- | | | |
| 2042 // \ | / \ | / | |
| 2043 // --------Region Phi | |
| 2044 // | |
| 2045 //============================================================================= | |
| 2046 // Code is structured as a series of driver functions all called 'do_XXX' that | |
| 2047 // call a set of helper functions. Helper functions first, then drivers. | |
| 2048 | |
| 2049 //------------------------------null_check_oop--------------------------------- | |
| 2050 // Null check oop. Set null-path control into Region in slot 3. | |
| 2051 // Make a cast-not-nullness use the other not-null control. Return cast. | |
| 2052 Node* GraphKit::null_check_oop(Node* value, Node* *null_control, | |
| 2053 bool never_see_null) { | |
| 2054 // Initial NULL check taken path | |
| 2055 (*null_control) = top(); | |
| 2056 Node* cast = null_check_common(value, T_OBJECT, false, null_control); | |
| 2057 | |
| 2058 // Generate uncommon_trap: | |
| 2059 if (never_see_null && (*null_control) != top()) { | |
| 2060 // If we see an unexpected null at a check-cast we record it and force a | |
| 2061 // recompile; the offending check-cast will be compiled to handle NULLs. | |
| 2062 // If we see more than one offending BCI, then all checkcasts in the | |
| 2063 // method will be compiled to handle NULLs. | |
| 2064 PreserveJVMState pjvms(this); | |
| 2065 set_control(*null_control); | |
| 332 | 2066 replace_in_map(value, null()); |
| 0 | 2067 uncommon_trap(Deoptimization::Reason_null_check, |
| 2068 Deoptimization::Action_make_not_entrant); | |
| 2069 (*null_control) = top(); // NULL path is dead | |
| 2070 } | |
| 2071 | |
| 2072 // Cast away null-ness on the result | |
| 2073 return cast; | |
| 2074 } | |
| 2075 | |
| 2076 //------------------------------opt_iff---------------------------------------- | |
| 2077 // Optimize the fast-check IfNode. Set the fast-path region slot 2. | |
| 2078 // Return slow-path control. | |
| 2079 Node* GraphKit::opt_iff(Node* region, Node* iff) { | |
| 2080 IfNode *opt_iff = _gvn.transform(iff)->as_If(); | |
| 2081 | |
| 2082 // Fast path taken; set region slot 2 | |
| 2083 Node *fast_taken = _gvn.transform( new (C, 1) IfFalseNode(opt_iff) ); | |
| 2084 region->init_req(2,fast_taken); // Capture fast-control | |
| 2085 | |
| 2086 // Fast path not-taken, i.e. slow path | |
| 2087 Node *slow_taken = _gvn.transform( new (C, 1) IfTrueNode(opt_iff) ); | |
| 2088 return slow_taken; | |
| 2089 } | |
| 2090 | |
| 2091 //-----------------------------make_runtime_call------------------------------- | |
| 2092 Node* GraphKit::make_runtime_call(int flags, | |
| 2093 const TypeFunc* call_type, address call_addr, | |
| 2094 const char* call_name, | |
| 2095 const TypePtr* adr_type, | |
| 2096 // The following parms are all optional. | |
| 2097 // The first NULL ends the list. | |
| 2098 Node* parm0, Node* parm1, | |
| 2099 Node* parm2, Node* parm3, | |
| 2100 Node* parm4, Node* parm5, | |
| 2101 Node* parm6, Node* parm7) { | |
| 2102 // Slow-path call | |
| 2103 int size = call_type->domain()->cnt(); | |
| 2104 bool is_leaf = !(flags & RC_NO_LEAF); | |
| 2105 bool has_io = (!is_leaf && !(flags & RC_NO_IO)); | |
| 2106 if (call_name == NULL) { | |
| 2107 assert(!is_leaf, "must supply name for leaf"); | |
| 2108 call_name = OptoRuntime::stub_name(call_addr); | |
| 2109 } | |
| 2110 CallNode* call; | |
| 2111 if (!is_leaf) { | |
| 2112 call = new(C, size) CallStaticJavaNode(call_type, call_addr, call_name, | |
| 2113 bci(), adr_type); | |
| 2114 } else if (flags & RC_NO_FP) { | |
| 2115 call = new(C, size) CallLeafNoFPNode(call_type, call_addr, call_name, adr_type); | |
| 2116 } else { | |
| 2117 call = new(C, size) CallLeafNode(call_type, call_addr, call_name, adr_type); | |
| 2118 } | |
| 2119 | |
| 2120 // The following is similar to set_edges_for_java_call, | |
| 2121 // except that the memory effects of the call are restricted to AliasIdxRaw. | |
| 2122 | |
| 2123 // Slow path call has no side-effects, uses few values | |
| 2124 bool wide_in = !(flags & RC_NARROW_MEM); | |
| 2125 bool wide_out = (C->get_alias_index(adr_type) == Compile::AliasIdxBot); | |
| 2126 | |
| 2127 Node* prev_mem = NULL; | |
| 2128 if (wide_in) { | |
| 2129 prev_mem = set_predefined_input_for_runtime_call(call); | |
| 2130 } else { | |
| 2131 assert(!wide_out, "narrow in => narrow out"); | |
| 2132 Node* narrow_mem = memory(adr_type); | |
| 2133 prev_mem = reset_memory(); | |
| 2134 map()->set_memory(narrow_mem); | |
| 2135 set_predefined_input_for_runtime_call(call); | |
| 2136 } | |
| 2137 | |
| 2138 // Hook each parm in order. Stop looking at the first NULL. | |
| 2139 if (parm0 != NULL) { call->init_req(TypeFunc::Parms+0, parm0); | |
| 2140 if (parm1 != NULL) { call->init_req(TypeFunc::Parms+1, parm1); | |
| 2141 if (parm2 != NULL) { call->init_req(TypeFunc::Parms+2, parm2); | |
| 2142 if (parm3 != NULL) { call->init_req(TypeFunc::Parms+3, parm3); | |
| 2143 if (parm4 != NULL) { call->init_req(TypeFunc::Parms+4, parm4); | |
| 2144 if (parm5 != NULL) { call->init_req(TypeFunc::Parms+5, parm5); | |
| 2145 if (parm6 != NULL) { call->init_req(TypeFunc::Parms+6, parm6); | |
| 2146 if (parm7 != NULL) { call->init_req(TypeFunc::Parms+7, parm7); | |
| 2147 /* close each nested if ===> */ } } } } } } } } | |
| 2148 assert(call->in(call->req()-1) != NULL, "must initialize all parms"); | |
| 2149 | |
| 2150 if (!is_leaf) { | |
| 2151 // Non-leaves can block and take safepoints: | |
| 2152 add_safepoint_edges(call, ((flags & RC_MUST_THROW) != 0)); | |
| 2153 } | |
| 2154 // Non-leaves can throw exceptions: | |
| 2155 if (has_io) { | |
| 2156 call->set_req(TypeFunc::I_O, i_o()); | |
| 2157 } | |
| 2158 | |
| 2159 if (flags & RC_UNCOMMON) { | |
| 2160 // Set the count to a tiny probability. Cf. Estimate_Block_Frequency. | |
| 2161 // (An "if" probability corresponds roughly to an unconditional count. | |
| 2162 // Sort of.) | |
| 2163 call->set_cnt(PROB_UNLIKELY_MAG(4)); | |
| 2164 } | |
| 2165 | |
| 2166 Node* c = _gvn.transform(call); | |
| 2167 assert(c == call, "cannot disappear"); | |
| 2168 | |
| 2169 if (wide_out) { | |
| 2170 // Slow path call has full side-effects. | |
| 2171 set_predefined_output_for_runtime_call(call); | |
| 2172 } else { | |
| 2173 // Slow path call has few side-effects, and/or sets few values. | |
| 2174 set_predefined_output_for_runtime_call(call, prev_mem, adr_type); | |
| 2175 } | |
| 2176 | |
| 2177 if (has_io) { | |
| 2178 set_i_o(_gvn.transform(new (C, 1) ProjNode(call, TypeFunc::I_O))); | |
| 2179 } | |
| 2180 return call; | |
| 2181 | |
| 2182 } | |
| 2183 | |
| 2184 //------------------------------merge_memory----------------------------------- | |
| 2185 // Merge memory from one path into the current memory state. | |
| 2186 void GraphKit::merge_memory(Node* new_mem, Node* region, int new_path) { | |
| 2187 for (MergeMemStream mms(merged_memory(), new_mem->as_MergeMem()); mms.next_non_empty2(); ) { | |
| 2188 Node* old_slice = mms.force_memory(); | |
| 2189 Node* new_slice = mms.memory2(); | |
| 2190 if (old_slice != new_slice) { | |
| 2191 PhiNode* phi; | |
| 2192 if (new_slice->is_Phi() && new_slice->as_Phi()->region() == region) { | |
| 2193 phi = new_slice->as_Phi(); | |
| 2194 #ifdef ASSERT | |
| 2195 if (old_slice->is_Phi() && old_slice->as_Phi()->region() == region) | |
| 2196 old_slice = old_slice->in(new_path); | |
| 2197 // Caller is responsible for ensuring that any pre-existing | |
| 2198 // phis are already aware of old memory. | |
| 2199 int old_path = (new_path > 1) ? 1 : 2; // choose old_path != new_path | |
| 2200 assert(phi->in(old_path) == old_slice, "pre-existing phis OK"); | |
| 2201 #endif | |
| 2202 mms.set_memory(phi); | |
| 2203 } else { | |
| 2204 phi = PhiNode::make(region, old_slice, Type::MEMORY, mms.adr_type(C)); | |
| 2205 _gvn.set_type(phi, Type::MEMORY); | |
| 2206 phi->set_req(new_path, new_slice); | |
| 2207 mms.set_memory(_gvn.transform(phi)); // assume it is complete | |
| 2208 } | |
| 2209 } | |
| 2210 } | |
| 2211 } | |
| 2212 | |
| 2213 //------------------------------make_slow_call_ex------------------------------ | |
| 2214 // Make the exception handler hookups for the slow call | |
| 2215 void GraphKit::make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj) { | |
| 2216 if (stopped()) return; | |
| 2217 | |
| 2218 // Make a catch node with just two handlers: fall-through and catch-all | |
| 2219 Node* i_o = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::I_O, separate_io_proj) ); | |
| 2220 Node* catc = _gvn.transform( new (C, 2) CatchNode(control(), i_o, 2) ); | |
| 2221 Node* norm = _gvn.transform( new (C, 1) CatchProjNode(catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci) ); | |
| 2222 Node* excp = _gvn.transform( new (C, 1) CatchProjNode(catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci) ); | |
| 2223 | |
| 2224 { PreserveJVMState pjvms(this); | |
| 2225 set_control(excp); | |
| 2226 set_i_o(i_o); | |
| 2227 | |
| 2228 if (excp != top()) { | |
| 2229 // Create an exception state also. | |
| 2230 // Use an exact type if the caller has specified a specific exception. | |
| 2231 const Type* ex_type = TypeOopPtr::make_from_klass_unique(ex_klass)->cast_to_ptr_type(TypePtr::NotNull); | |
| 2232 Node* ex_oop = new (C, 2) CreateExNode(ex_type, control(), i_o); | |
| 2233 add_exception_state(make_exception_state(_gvn.transform(ex_oop))); | |
| 2234 } | |
| 2235 } | |
| 2236 | |
| 2237 // Get the no-exception control from the CatchNode. | |
| 2238 set_control(norm); | |
| 2239 } | |
| 2240 | |
| 2241 | |
| 2242 //-------------------------------gen_subtype_check----------------------------- | |
| 2243 // Generate a subtyping check. Takes as input the subtype and supertype. | |
| 2244 // Returns 2 values: sets the default control() to the true path and returns | |
| 2245 // the false path. Only reads invariant memory; sets no (visible) memory. | |
| 2246 // The PartialSubtypeCheckNode sets the hidden 1-word cache in the encoding | |
| 2247 // but that's not exposed to the optimizer. This call also doesn't take in an | |
| 2248 // Object; if you wish to check an Object you need to load the Object's class | |
| 2249 // prior to coming here. | |
| 2250 Node* GraphKit::gen_subtype_check(Node* subklass, Node* superklass) { | |
| 2251 // Fast check for identical types, perhaps identical constants. | |
| 2252 // The types can even be identical non-constants, in cases | |
| 2253 // involving Array.newInstance, Object.clone, etc. | |
| 2254 if (subklass == superklass) | |
| 2255 return top(); // false path is dead; no test needed. | |
| 2256 | |
| 2257 if (_gvn.type(superklass)->singleton()) { | |
| 2258 ciKlass* superk = _gvn.type(superklass)->is_klassptr()->klass(); | |
| 2259 ciKlass* subk = _gvn.type(subklass)->is_klassptr()->klass(); | |
| 2260 | |
| 2261 // In the common case of an exact superklass, try to fold up the | |
| 2262 // test before generating code. You may ask, why not just generate | |
| 2263 // the code and then let it fold up? The answer is that the generated | |
| 2264 // code will necessarily include null checks, which do not always | |
| 2265 // completely fold away. If they are also needless, then they turn | |
| 2266 // into a performance loss. Example: | |
| 2267 // Foo[] fa = blah(); Foo x = fa[0]; fa[1] = x; | |
| 2268 // Here, the type of 'fa' is often exact, so the store check | |
| 2269 // of fa[1]=x will fold up, without testing the nullness of x. | |
| 2270 switch (static_subtype_check(superk, subk)) { | |
| 2271 case SSC_always_false: | |
| 2272 { | |
| 2273 Node* always_fail = control(); | |
| 2274 set_control(top()); | |
| 2275 return always_fail; | |
| 2276 } | |
| 2277 case SSC_always_true: | |
| 2278 return top(); | |
| 2279 case SSC_easy_test: | |
| 2280 { | |
| 2281 // Just do a direct pointer compare and be done. | |
| 2282 Node* cmp = _gvn.transform( new(C, 3) CmpPNode(subklass, superklass) ); | |
| 2283 Node* bol = _gvn.transform( new(C, 2) BoolNode(cmp, BoolTest::eq) ); | |
| 2284 IfNode* iff = create_and_xform_if(control(), bol, PROB_STATIC_FREQUENT, COUNT_UNKNOWN); | |
| 2285 set_control( _gvn.transform( new(C, 1) IfTrueNode (iff) ) ); | |
| 2286 return _gvn.transform( new(C, 1) IfFalseNode(iff) ); | |
| 2287 } | |
| 2288 case SSC_full_test: | |
| 2289 break; | |
| 2290 default: | |
| 2291 ShouldNotReachHere(); | |
| 2292 } | |
| 2293 } | |
| 2294 | |
| 2295 // %%% Possible further optimization: Even if the superklass is not exact, | |
| 2296 // if the subklass is the unique subtype of the superklass, the check | |
| 2297 // will always succeed. We could leave a dependency behind to ensure this. | |
| 2298 | |
| 2299 // First load the super-klass's check-offset | |
| 2300 Node *p1 = basic_plus_adr( superklass, superklass, sizeof(oopDesc) + Klass::super_check_offset_offset_in_bytes() ); | |
| 2301 Node *chk_off = _gvn.transform( new (C, 3) LoadINode( NULL, memory(p1), p1, _gvn.type(p1)->is_ptr() ) ); | |
| 2302 int cacheoff_con = sizeof(oopDesc) + Klass::secondary_super_cache_offset_in_bytes(); | |
| 2303 bool might_be_cache = (find_int_con(chk_off, cacheoff_con) == cacheoff_con); | |
| 2304 | |
| 2305 // Load from the sub-klass's super-class display list, or a 1-word cache of | |
| 2306 // the secondary superclass list, or a failing value with a sentinel offset | |
| 2307 // if the super-klass is an interface or exceptionally deep in the Java | |
| 2308 // hierarchy and we have to scan the secondary superclass list the hard way. | |
| 2309 // Worst-case type is a little odd: NULL is allowed as a result (usually | |
| 2310 // klass loads can never produce a NULL). | |
| 2311 Node *chk_off_X = ConvI2X(chk_off); | |
| 2312 Node *p2 = _gvn.transform( new (C, 4) AddPNode(subklass,subklass,chk_off_X) ); | |
| 2313 // For some types like interfaces the following loadKlass is from a 1-word | |
| 2314 // cache which is mutable so can't use immutable memory. Other | |
| 2315 // types load from the super-class display table which is immutable. | |
| 2316 Node *kmem = might_be_cache ? memory(p2) : immutable_memory(); | |
|
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2317 Node *nkls = _gvn.transform( LoadKlassNode::make( _gvn, kmem, p2, _gvn.type(p2)->is_ptr(), TypeKlassPtr::OBJECT_OR_NULL ) ); |
| 0 | 2318 |
| 2319 // Compile speed common case: ARE a subtype and we canNOT fail | |
| 2320 if( superklass == nkls ) | |
| 2321 return top(); // false path is dead; no test needed. | |
| 2322 | |
| 2323 // See if we get an immediate positive hit. Happens roughly 83% of the | |
| 2324 // time. Test to see if the value loaded just previously from the subklass | |
| 2325 // is exactly the superklass. | |
| 2326 Node *cmp1 = _gvn.transform( new (C, 3) CmpPNode( superklass, nkls ) ); | |
| 2327 Node *bol1 = _gvn.transform( new (C, 2) BoolNode( cmp1, BoolTest::eq ) ); | |
| 2328 IfNode *iff1 = create_and_xform_if( control(), bol1, PROB_LIKELY(0.83f), COUNT_UNKNOWN ); | |
| 2329 Node *iftrue1 = _gvn.transform( new (C, 1) IfTrueNode ( iff1 ) ); | |
| 2330 set_control( _gvn.transform( new (C, 1) IfFalseNode( iff1 ) ) ); | |
| 2331 | |
| 2332 // Compile speed common case: Check for being deterministic right now. If | |
| 2333 // chk_off is a constant and not equal to cacheoff then we are NOT a | |
| 2334 // subklass. In this case we need exactly the 1 test above and we can | |
| 2335 // return those results immediately. | |
| 2336 if (!might_be_cache) { | |
| 2337 Node* not_subtype_ctrl = control(); | |
| 2338 set_control(iftrue1); // We need exactly the 1 test above | |
| 2339 return not_subtype_ctrl; | |
| 2340 } | |
| 2341 | |
| 2342 // Gather the various success & failures here | |
| 2343 RegionNode *r_ok_subtype = new (C, 4) RegionNode(4); | |
| 2344 record_for_igvn(r_ok_subtype); | |
| 2345 RegionNode *r_not_subtype = new (C, 3) RegionNode(3); | |
| 2346 record_for_igvn(r_not_subtype); | |
| 2347 | |
| 2348 r_ok_subtype->init_req(1, iftrue1); | |
| 2349 | |
| 2350 // Check for immediate negative hit. Happens roughly 11% of the time (which | |
| 2351 // is roughly 63% of the remaining cases). Test to see if the loaded | |
| 2352 // check-offset points into the subklass display list or the 1-element | |
| 2353 // cache. If it points to the display (and NOT the cache) and the display | |
| 2354 // missed then it's not a subtype. | |
| 2355 Node *cacheoff = _gvn.intcon(cacheoff_con); | |
| 2356 Node *cmp2 = _gvn.transform( new (C, 3) CmpINode( chk_off, cacheoff ) ); | |
| 2357 Node *bol2 = _gvn.transform( new (C, 2) BoolNode( cmp2, BoolTest::ne ) ); | |
| 2358 IfNode *iff2 = create_and_xform_if( control(), bol2, PROB_LIKELY(0.63f), COUNT_UNKNOWN ); | |
| 2359 r_not_subtype->init_req(1, _gvn.transform( new (C, 1) IfTrueNode (iff2) ) ); | |
| 2360 set_control( _gvn.transform( new (C, 1) IfFalseNode(iff2) ) ); | |
| 2361 | |
|
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2362 // Check for self. Very rare to get here, but it is taken 1/3 the time. |
| 0 | 2363 // No performance impact (too rare) but allows sharing of secondary arrays |
| 2364 // which has some footprint reduction. | |
| 2365 Node *cmp3 = _gvn.transform( new (C, 3) CmpPNode( subklass, superklass ) ); | |
| 2366 Node *bol3 = _gvn.transform( new (C, 2) BoolNode( cmp3, BoolTest::eq ) ); | |
| 2367 IfNode *iff3 = create_and_xform_if( control(), bol3, PROB_LIKELY(0.36f), COUNT_UNKNOWN ); | |
| 2368 r_ok_subtype->init_req(2, _gvn.transform( new (C, 1) IfTrueNode ( iff3 ) ) ); | |
| 2369 set_control( _gvn.transform( new (C, 1) IfFalseNode( iff3 ) ) ); | |
| 2370 | |
|
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2371 // -- Roads not taken here: -- |
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2372 // We could also have chosen to perform the self-check at the beginning |
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2373 // of this code sequence, as the assembler does. This would not pay off |
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2374 // the same way, since the optimizer, unlike the assembler, can perform |
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2375 // static type analysis to fold away many successful self-checks. |
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2376 // Non-foldable self checks work better here in second position, because |
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2377 // the initial primary superclass check subsumes a self-check for most |
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2378 // types. An exception would be a secondary type like array-of-interface, |
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2379 // which does not appear in its own primary supertype display. |
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2380 // Finally, we could have chosen to move the self-check into the |
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2381 // PartialSubtypeCheckNode, and from there out-of-line in a platform |
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2382 // dependent manner. But it is worthwhile to have the check here, |
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2383 // where it can be perhaps be optimized. The cost in code space is |
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2384 // small (register compare, branch). |
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2385 |
| 0 | 2386 // Now do a linear scan of the secondary super-klass array. Again, no real |
| 2387 // performance impact (too rare) but it's gotta be done. | |
| 2388 // Since the code is rarely used, there is no penalty for moving it | |
|
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2389 // out of line, and it can only improve I-cache density. |
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2390 // The decision to inline or out-of-line this final check is platform |
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2391 // dependent, and is found in the AD file definition of PartialSubtypeCheck. |
| 0 | 2392 Node* psc = _gvn.transform( |
| 2393 new (C, 3) PartialSubtypeCheckNode(control(), subklass, superklass) ); | |
| 2394 | |
| 2395 Node *cmp4 = _gvn.transform( new (C, 3) CmpPNode( psc, null() ) ); | |
| 2396 Node *bol4 = _gvn.transform( new (C, 2) BoolNode( cmp4, BoolTest::ne ) ); | |
| 2397 IfNode *iff4 = create_and_xform_if( control(), bol4, PROB_FAIR, COUNT_UNKNOWN ); | |
| 2398 r_not_subtype->init_req(2, _gvn.transform( new (C, 1) IfTrueNode (iff4) ) ); | |
| 2399 r_ok_subtype ->init_req(3, _gvn.transform( new (C, 1) IfFalseNode(iff4) ) ); | |
| 2400 | |
| 2401 // Return false path; set default control to true path. | |
| 2402 set_control( _gvn.transform(r_ok_subtype) ); | |
| 2403 return _gvn.transform(r_not_subtype); | |
| 2404 } | |
| 2405 | |
| 2406 //----------------------------static_subtype_check----------------------------- | |
| 2407 // Shortcut important common cases when superklass is exact: | |
| 2408 // (0) superklass is java.lang.Object (can occur in reflective code) | |
| 2409 // (1) subklass is already limited to a subtype of superklass => always ok | |
| 2410 // (2) subklass does not overlap with superklass => always fail | |
| 2411 // (3) superklass has NO subtypes and we can check with a simple compare. | |
| 2412 int GraphKit::static_subtype_check(ciKlass* superk, ciKlass* subk) { | |
| 2413 if (StressReflectiveCode) { | |
| 2414 return SSC_full_test; // Let caller generate the general case. | |
| 2415 } | |
| 2416 | |
| 2417 if (superk == env()->Object_klass()) { | |
| 2418 return SSC_always_true; // (0) this test cannot fail | |
| 2419 } | |
| 2420 | |
| 2421 ciType* superelem = superk; | |
| 2422 if (superelem->is_array_klass()) | |
| 2423 superelem = superelem->as_array_klass()->base_element_type(); | |
| 2424 | |
| 2425 if (!subk->is_interface()) { // cannot trust static interface types yet | |
| 2426 if (subk->is_subtype_of(superk)) { | |
| 2427 return SSC_always_true; // (1) false path dead; no dynamic test needed | |
| 2428 } | |
| 2429 if (!(superelem->is_klass() && superelem->as_klass()->is_interface()) && | |
| 2430 !superk->is_subtype_of(subk)) { | |
| 2431 return SSC_always_false; | |
| 2432 } | |
| 2433 } | |
| 2434 | |
| 2435 // If casting to an instance klass, it must have no subtypes | |
| 2436 if (superk->is_interface()) { | |
| 2437 // Cannot trust interfaces yet. | |
| 2438 // %%% S.B. superk->nof_implementors() == 1 | |
| 2439 } else if (superelem->is_instance_klass()) { | |
| 2440 ciInstanceKlass* ik = superelem->as_instance_klass(); | |
| 2441 if (!ik->has_subklass() && !ik->is_interface()) { | |
| 2442 if (!ik->is_final()) { | |
| 2443 // Add a dependency if there is a chance of a later subclass. | |
| 2444 C->dependencies()->assert_leaf_type(ik); | |
| 2445 } | |
| 2446 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
| 2447 } | |
| 2448 } else { | |
| 2449 // A primitive array type has no subtypes. | |
| 2450 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
| 2451 } | |
| 2452 | |
| 2453 return SSC_full_test; | |
| 2454 } | |
| 2455 | |
| 2456 // Profile-driven exact type check: | |
| 2457 Node* GraphKit::type_check_receiver(Node* receiver, ciKlass* klass, | |
| 2458 float prob, | |
| 2459 Node* *casted_receiver) { | |
| 2460 const TypeKlassPtr* tklass = TypeKlassPtr::make(klass); | |
| 2461 Node* recv_klass = load_object_klass(receiver); | |
| 2462 Node* want_klass = makecon(tklass); | |
| 2463 Node* cmp = _gvn.transform( new(C, 3) CmpPNode(recv_klass, want_klass) ); | |
| 2464 Node* bol = _gvn.transform( new(C, 2) BoolNode(cmp, BoolTest::eq) ); | |
| 2465 IfNode* iff = create_and_xform_if(control(), bol, prob, COUNT_UNKNOWN); | |
| 2466 set_control( _gvn.transform( new(C, 1) IfTrueNode (iff) )); | |
| 2467 Node* fail = _gvn.transform( new(C, 1) IfFalseNode(iff) ); | |
| 2468 | |
| 2469 const TypeOopPtr* recv_xtype = tklass->as_instance_type(); | |
| 2470 assert(recv_xtype->klass_is_exact(), ""); | |
| 2471 | |
| 2472 // Subsume downstream occurrences of receiver with a cast to | |
| 2473 // recv_xtype, since now we know what the type will be. | |
| 2474 Node* cast = new(C, 2) CheckCastPPNode(control(), receiver, recv_xtype); | |
| 2475 (*casted_receiver) = _gvn.transform(cast); | |
| 2476 // (User must make the replace_in_map call.) | |
| 2477 | |
| 2478 return fail; | |
| 2479 } | |
| 2480 | |
| 2481 | |
|
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2482 //------------------------------seems_never_null------------------------------- |
|
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2483 // Use null_seen information if it is available from the profile. |
|
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2484 // If we see an unexpected null at a type check we record it and force a |
|
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2485 // recompile; the offending check will be recompiled to handle NULLs. |
|
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2486 // If we see several offending BCIs, then all checks in the |
|
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2487 // method will be recompiled. |
|
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2488 bool GraphKit::seems_never_null(Node* obj, ciProfileData* data) { |
|
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2489 if (UncommonNullCast // Cutout for this technique |
|
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2490 && obj != null() // And not the -Xcomp stupid case? |
|
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2491 && !too_many_traps(Deoptimization::Reason_null_check) |
|
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2492 ) { |
|
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2493 if (data == NULL) |
|
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2494 // Edge case: no mature data. Be optimistic here. |
|
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2495 return true; |
|
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2496 // If the profile has not seen a null, assume it won't happen. |
|
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2497 assert(java_bc() == Bytecodes::_checkcast || |
|
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2498 java_bc() == Bytecodes::_instanceof || |
|
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2499 java_bc() == Bytecodes::_aastore, "MDO must collect null_seen bit here"); |
|
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2500 return !data->as_BitData()->null_seen(); |
|
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2501 } |
|
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2502 return false; |
|
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2503 } |
|
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2504 |
|
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2505 //------------------------maybe_cast_profiled_receiver------------------------- |
|
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2506 // If the profile has seen exactly one type, narrow to exactly that type. |
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2507 // Subsequent type checks will always fold up. |
|
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2508 Node* GraphKit::maybe_cast_profiled_receiver(Node* not_null_obj, |
|
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2509 ciProfileData* data, |
|
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2510 ciKlass* require_klass) { |
|
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2511 if (!UseTypeProfile || !TypeProfileCasts) return NULL; |
|
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2512 if (data == NULL) return NULL; |
|
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2513 |
|
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2514 // Make sure we haven't already deoptimized from this tactic. |
|
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2515 if (too_many_traps(Deoptimization::Reason_class_check)) |
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2516 return NULL; |
|
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2517 |
|
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2518 // (No, this isn't a call, but it's enough like a virtual call |
|
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2519 // to use the same ciMethod accessor to get the profile info...) |
|
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2520 ciCallProfile profile = method()->call_profile_at_bci(bci()); |
|
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2521 if (profile.count() >= 0 && // no cast failures here |
|
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2522 profile.has_receiver(0) && |
|
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2523 profile.morphism() == 1) { |
|
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2524 ciKlass* exact_kls = profile.receiver(0); |
|
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2525 if (require_klass == NULL || |
|
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2526 static_subtype_check(require_klass, exact_kls) == SSC_always_true) { |
|
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2527 // If we narrow the type to match what the type profile sees, |
|
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2528 // we can then remove the rest of the cast. |
|
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2529 // This is a win, even if the exact_kls is very specific, |
|
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2530 // because downstream operations, such as method calls, |
|
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2531 // will often benefit from the sharper type. |
|
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2532 Node* exact_obj = not_null_obj; // will get updated in place... |
|
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2533 Node* slow_ctl = type_check_receiver(exact_obj, exact_kls, 1.0, |
|
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2534 &exact_obj); |
|
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2535 { PreserveJVMState pjvms(this); |
|
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2536 set_control(slow_ctl); |
|
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2537 uncommon_trap(Deoptimization::Reason_class_check, |
|
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2538 Deoptimization::Action_maybe_recompile); |
|
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2539 } |
|
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2540 replace_in_map(not_null_obj, exact_obj); |
|
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2541 return exact_obj; |
|
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|
2542 } |
|
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2543 // assert(ssc == SSC_always_true)... except maybe the profile lied to us. |
|
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|
2544 } |
|
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|
2545 |
|
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|
2546 return NULL; |
|
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|
2547 } |
|
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|
2548 |
|
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2549 |
| 0 | 2550 //-------------------------------gen_instanceof-------------------------------- |
| 2551 // Generate an instance-of idiom. Used by both the instance-of bytecode | |
| 2552 // and the reflective instance-of call. | |
|
1746
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2553 Node* GraphKit::gen_instanceof(Node* obj, Node* superklass) { |
|
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2554 kill_dead_locals(); // Benefit all the uncommon traps |
| 0 | 2555 assert( !stopped(), "dead parse path should be checked in callers" ); |
| 2556 assert(!TypePtr::NULL_PTR->higher_equal(_gvn.type(superklass)->is_klassptr()), | |
| 2557 "must check for not-null not-dead klass in callers"); | |
| 2558 | |
| 2559 // Make the merge point | |
| 2560 enum { _obj_path = 1, _fail_path, _null_path, PATH_LIMIT }; | |
| 2561 RegionNode* region = new(C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
| 2562 Node* phi = new(C, PATH_LIMIT) PhiNode(region, TypeInt::BOOL); | |
| 2563 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
| 2564 | |
|
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2565 ciProfileData* data = NULL; |
|
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2566 if (java_bc() == Bytecodes::_instanceof) { // Only for the bytecode |
|
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2567 data = method()->method_data()->bci_to_data(bci()); |
|
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2568 } |
|
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|
2569 bool never_see_null = (ProfileDynamicTypes // aggressive use of profile |
|
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2570 && seems_never_null(obj, data)); |
|
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2571 |
| 0 | 2572 // Null check; get casted pointer; set region slot 3 |
| 2573 Node* null_ctl = top(); | |
|
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2574 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); |
| 0 | 2575 |
| 2576 // If not_null_obj is dead, only null-path is taken | |
| 2577 if (stopped()) { // Doing instance-of on a NULL? | |
| 2578 set_control(null_ctl); | |
| 2579 return intcon(0); | |
| 2580 } | |
| 2581 region->init_req(_null_path, null_ctl); | |
| 2582 phi ->init_req(_null_path, intcon(0)); // Set null path value | |
|
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2583 if (null_ctl == top()) { |
|
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|
2584 // Do this eagerly, so that pattern matches like is_diamond_phi |
|
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2585 // will work even during parsing. |
|
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|
2586 assert(_null_path == PATH_LIMIT-1, "delete last"); |
|
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|
2587 region->del_req(_null_path); |
|
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|
2588 phi ->del_req(_null_path); |
|
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|
2589 } |
|
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|
2590 |
|
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|
2591 if (ProfileDynamicTypes && data != NULL) { |
|
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2592 Node* cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, NULL); |
|
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2593 if (stopped()) { // Profile disagrees with this path. |
|
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|
2594 set_control(null_ctl); // Null is the only remaining possibility. |
|
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|
2595 return intcon(0); |
|
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|
2596 } |
|
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|
2597 if (cast_obj != NULL) |
|
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|
2598 not_null_obj = cast_obj; |
|
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|
2599 } |
| 0 | 2600 |
| 2601 // Load the object's klass | |
| 2602 Node* obj_klass = load_object_klass(not_null_obj); | |
| 2603 | |
| 2604 // Generate the subtype check | |
| 2605 Node* not_subtype_ctrl = gen_subtype_check(obj_klass, superklass); | |
| 2606 | |
| 2607 // Plug in the success path to the general merge in slot 1. | |
| 2608 region->init_req(_obj_path, control()); | |
| 2609 phi ->init_req(_obj_path, intcon(1)); | |
| 2610 | |
| 2611 // Plug in the failing path to the general merge in slot 2. | |
| 2612 region->init_req(_fail_path, not_subtype_ctrl); | |
| 2613 phi ->init_req(_fail_path, intcon(0)); | |
| 2614 | |
| 2615 // Return final merged results | |
| 2616 set_control( _gvn.transform(region) ); | |
| 2617 record_for_igvn(region); | |
| 2618 return _gvn.transform(phi); | |
| 2619 } | |
| 2620 | |
| 2621 //-------------------------------gen_checkcast--------------------------------- | |
| 2622 // Generate a checkcast idiom. Used by both the checkcast bytecode and the | |
| 2623 // array store bytecode. Stack must be as-if BEFORE doing the bytecode so the | |
| 2624 // uncommon-trap paths work. Adjust stack after this call. | |
| 2625 // If failure_control is supplied and not null, it is filled in with | |
| 2626 // the control edge for the cast failure. Otherwise, an appropriate | |
| 2627 // uncommon trap or exception is thrown. | |
| 2628 Node* GraphKit::gen_checkcast(Node *obj, Node* superklass, | |
| 2629 Node* *failure_control) { | |
| 2630 kill_dead_locals(); // Benefit all the uncommon traps | |
| 2631 const TypeKlassPtr *tk = _gvn.type(superklass)->is_klassptr(); | |
| 2632 const Type *toop = TypeOopPtr::make_from_klass(tk->klass()); | |
| 2633 | |
| 2634 // Fast cutout: Check the case that the cast is vacuously true. | |
| 2635 // This detects the common cases where the test will short-circuit | |
| 2636 // away completely. We do this before we perform the null check, | |
| 2637 // because if the test is going to turn into zero code, we don't | |
| 2638 // want a residual null check left around. (Causes a slowdown, | |
| 2639 // for example, in some objArray manipulations, such as a[i]=a[j].) | |
| 2640 if (tk->singleton()) { | |
| 2641 const TypeOopPtr* objtp = _gvn.type(obj)->isa_oopptr(); | |
| 2642 if (objtp != NULL && objtp->klass() != NULL) { | |
| 2643 switch (static_subtype_check(tk->klass(), objtp->klass())) { | |
| 2644 case SSC_always_true: | |
| 2645 return obj; | |
| 2646 case SSC_always_false: | |
| 2647 // It needs a null check because a null will *pass* the cast check. | |
| 2648 // A non-null value will always produce an exception. | |
| 2649 return do_null_assert(obj, T_OBJECT); | |
| 2650 } | |
| 2651 } | |
| 2652 } | |
| 2653 | |
| 2654 ciProfileData* data = NULL; | |
| 2655 if (failure_control == NULL) { // use MDO in regular case only | |
| 2656 assert(java_bc() == Bytecodes::_aastore || | |
| 2657 java_bc() == Bytecodes::_checkcast, | |
| 2658 "interpreter profiles type checks only for these BCs"); | |
| 2659 data = method()->method_data()->bci_to_data(bci()); | |
| 2660 } | |
| 2661 | |
| 2662 // Make the merge point | |
| 2663 enum { _obj_path = 1, _null_path, PATH_LIMIT }; | |
| 2664 RegionNode* region = new (C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
| 2665 Node* phi = new (C, PATH_LIMIT) PhiNode(region, toop); | |
| 2666 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
| 2667 | |
| 2668 // Use null-cast information if it is available | |
|
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2669 bool never_see_null = ((failure_control == NULL) // regular case only |
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2670 && seems_never_null(obj, data)); |
| 0 | 2671 |
| 2672 // Null check; get casted pointer; set region slot 3 | |
| 2673 Node* null_ctl = top(); | |
| 2674 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); | |
| 2675 | |
| 2676 // If not_null_obj is dead, only null-path is taken | |
| 2677 if (stopped()) { // Doing instance-of on a NULL? | |
| 2678 set_control(null_ctl); | |
| 2679 return null(); | |
| 2680 } | |
| 2681 region->init_req(_null_path, null_ctl); | |
| 2682 phi ->init_req(_null_path, null()); // Set null path value | |
|
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2683 if (null_ctl == top()) { |
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2684 // Do this eagerly, so that pattern matches like is_diamond_phi |
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2685 // will work even during parsing. |
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2686 assert(_null_path == PATH_LIMIT-1, "delete last"); |
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2687 region->del_req(_null_path); |
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2688 phi ->del_req(_null_path); |
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2689 } |
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2690 |
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2691 Node* cast_obj = NULL; |
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2692 if (data != NULL && |
| 0 | 2693 // Counter has never been decremented (due to cast failure). |
| 2694 // ...This is a reasonable thing to expect. It is true of | |
| 2695 // all casts inserted by javac to implement generic types. | |
|
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2696 data->as_CounterData()->count() >= 0) { |
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2697 cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, tk->klass()); |
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2698 if (cast_obj != NULL) { |
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2699 if (failure_control != NULL) // failure is now impossible |
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2700 (*failure_control) = top(); |
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2701 // adjust the type of the phi to the exact klass: |
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2702 phi->raise_bottom_type(_gvn.type(cast_obj)->meet(TypePtr::NULL_PTR)); |
| 0 | 2703 } |
| 2704 } | |
| 2705 | |
| 2706 if (cast_obj == NULL) { | |
| 2707 // Load the object's klass | |
| 2708 Node* obj_klass = load_object_klass(not_null_obj); | |
| 2709 | |
| 2710 // Generate the subtype check | |
| 2711 Node* not_subtype_ctrl = gen_subtype_check( obj_klass, superklass ); | |
| 2712 | |
| 2713 // Plug in success path into the merge | |
| 2714 cast_obj = _gvn.transform(new (C, 2) CheckCastPPNode(control(), | |
| 2715 not_null_obj, toop)); | |
| 2716 // Failure path ends in uncommon trap (or may be dead - failure impossible) | |
| 2717 if (failure_control == NULL) { | |
| 2718 if (not_subtype_ctrl != top()) { // If failure is possible | |
| 2719 PreserveJVMState pjvms(this); | |
| 2720 set_control(not_subtype_ctrl); | |
| 2721 builtin_throw(Deoptimization::Reason_class_check, obj_klass); | |
| 2722 } | |
| 2723 } else { | |
| 2724 (*failure_control) = not_subtype_ctrl; | |
| 2725 } | |
| 2726 } | |
| 2727 | |
| 2728 region->init_req(_obj_path, control()); | |
| 2729 phi ->init_req(_obj_path, cast_obj); | |
| 2730 | |
| 2731 // A merge of NULL or Casted-NotNull obj | |
| 2732 Node* res = _gvn.transform(phi); | |
| 2733 | |
| 2734 // Note I do NOT always 'replace_in_map(obj,result)' here. | |
| 2735 // if( tk->klass()->can_be_primary_super() ) | |
| 2736 // This means that if I successfully store an Object into an array-of-String | |
| 2737 // I 'forget' that the Object is really now known to be a String. I have to | |
| 2738 // do this because we don't have true union types for interfaces - if I store | |
| 2739 // a Baz into an array-of-Interface and then tell the optimizer it's an | |
| 2740 // Interface, I forget that it's also a Baz and cannot do Baz-like field | |
| 2741 // references to it. FIX THIS WHEN UNION TYPES APPEAR! | |
| 2742 // replace_in_map( obj, res ); | |
| 2743 | |
| 2744 // Return final merged results | |
| 2745 set_control( _gvn.transform(region) ); | |
| 2746 record_for_igvn(region); | |
| 2747 return res; | |
| 2748 } | |
| 2749 | |
| 2750 //------------------------------next_monitor----------------------------------- | |
| 2751 // What number should be given to the next monitor? | |
| 2752 int GraphKit::next_monitor() { | |
| 2753 int current = jvms()->monitor_depth()* C->sync_stack_slots(); | |
| 2754 int next = current + C->sync_stack_slots(); | |
| 2755 // Keep the toplevel high water mark current: | |
| 2756 if (C->fixed_slots() < next) C->set_fixed_slots(next); | |
| 2757 return current; | |
| 2758 } | |
| 2759 | |
| 2760 //------------------------------insert_mem_bar--------------------------------- | |
| 2761 // Memory barrier to avoid floating things around | |
| 2762 // The membar serves as a pinch point between both control and all memory slices. | |
| 2763 Node* GraphKit::insert_mem_bar(int opcode, Node* precedent) { | |
| 2764 MemBarNode* mb = MemBarNode::make(C, opcode, Compile::AliasIdxBot, precedent); | |
| 2765 mb->init_req(TypeFunc::Control, control()); | |
| 2766 mb->init_req(TypeFunc::Memory, reset_memory()); | |
| 2767 Node* membar = _gvn.transform(mb); | |
| 2768 set_control(_gvn.transform(new (C, 1) ProjNode(membar,TypeFunc::Control) )); | |
| 2769 set_all_memory_call(membar); | |
| 2770 return membar; | |
| 2771 } | |
| 2772 | |
| 2773 //-------------------------insert_mem_bar_volatile---------------------------- | |
| 2774 // Memory barrier to avoid floating things around | |
| 2775 // The membar serves as a pinch point between both control and memory(alias_idx). | |
| 2776 // If you want to make a pinch point on all memory slices, do not use this | |
| 2777 // function (even with AliasIdxBot); use insert_mem_bar() instead. | |
| 2778 Node* GraphKit::insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent) { | |
| 2779 // When Parse::do_put_xxx updates a volatile field, it appends a series | |
| 2780 // of MemBarVolatile nodes, one for *each* volatile field alias category. | |
| 2781 // The first membar is on the same memory slice as the field store opcode. | |
| 2782 // This forces the membar to follow the store. (Bug 6500685 broke this.) | |
| 2783 // All the other membars (for other volatile slices, including AliasIdxBot, | |
| 2784 // which stands for all unknown volatile slices) are control-dependent | |
| 2785 // on the first membar. This prevents later volatile loads or stores | |
| 2786 // from sliding up past the just-emitted store. | |
| 2787 | |
| 2788 MemBarNode* mb = MemBarNode::make(C, opcode, alias_idx, precedent); | |
| 2789 mb->set_req(TypeFunc::Control,control()); | |
| 2790 if (alias_idx == Compile::AliasIdxBot) { | |
| 2791 mb->set_req(TypeFunc::Memory, merged_memory()->base_memory()); | |
| 2792 } else { | |
| 2793 assert(!(opcode == Op_Initialize && alias_idx != Compile::AliasIdxRaw), "fix caller"); | |
| 2794 mb->set_req(TypeFunc::Memory, memory(alias_idx)); | |
| 2795 } | |
| 2796 Node* membar = _gvn.transform(mb); | |
| 2797 set_control(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Control))); | |
| 2798 if (alias_idx == Compile::AliasIdxBot) { | |
| 2799 merged_memory()->set_base_memory(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Memory))); | |
| 2800 } else { | |
| 2801 set_memory(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Memory)),alias_idx); | |
| 2802 } | |
| 2803 return membar; | |
| 2804 } | |
| 2805 | |
| 2806 //------------------------------shared_lock------------------------------------ | |
| 2807 // Emit locking code. | |
| 2808 FastLockNode* GraphKit::shared_lock(Node* obj) { | |
| 2809 // bci is either a monitorenter bc or InvocationEntryBci | |
| 2810 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
| 2811 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
| 2812 | |
| 2813 if( !GenerateSynchronizationCode ) | |
| 2814 return NULL; // Not locking things? | |
| 2815 if (stopped()) // Dead monitor? | |
| 2816 return NULL; | |
| 2817 | |
| 2818 assert(dead_locals_are_killed(), "should kill locals before sync. point"); | |
| 2819 | |
| 2820 // Box the stack location | |
| 2821 Node* box = _gvn.transform(new (C, 1) BoxLockNode(next_monitor())); | |
| 2822 Node* mem = reset_memory(); | |
| 2823 | |
| 2824 FastLockNode * flock = _gvn.transform(new (C, 3) FastLockNode(0, obj, box) )->as_FastLock(); | |
| 2825 if (PrintPreciseBiasedLockingStatistics) { | |
| 2826 // Create the counters for this fast lock. | |
| 2827 flock->create_lock_counter(sync_jvms()); // sync_jvms used to get current bci | |
| 2828 } | |
| 2829 // Add monitor to debug info for the slow path. If we block inside the | |
| 2830 // slow path and de-opt, we need the monitor hanging around | |
| 2831 map()->push_monitor( flock ); | |
| 2832 | |
| 2833 const TypeFunc *tf = LockNode::lock_type(); | |
| 2834 LockNode *lock = new (C, tf->domain()->cnt()) LockNode(C, tf); | |
| 2835 | |
| 2836 lock->init_req( TypeFunc::Control, control() ); | |
| 2837 lock->init_req( TypeFunc::Memory , mem ); | |
| 2838 lock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
| 2839 lock->init_req( TypeFunc::FramePtr, frameptr() ); | |
| 2840 lock->init_req( TypeFunc::ReturnAdr, top() ); | |
| 2841 | |
| 2842 lock->init_req(TypeFunc::Parms + 0, obj); | |
| 2843 lock->init_req(TypeFunc::Parms + 1, box); | |
| 2844 lock->init_req(TypeFunc::Parms + 2, flock); | |
| 2845 add_safepoint_edges(lock); | |
| 2846 | |
| 2847 lock = _gvn.transform( lock )->as_Lock(); | |
| 2848 | |
| 2849 // lock has no side-effects, sets few values | |
| 2850 set_predefined_output_for_runtime_call(lock, mem, TypeRawPtr::BOTTOM); | |
| 2851 | |
| 2852 insert_mem_bar(Op_MemBarAcquire); | |
| 2853 | |
| 2854 // Add this to the worklist so that the lock can be eliminated | |
| 2855 record_for_igvn(lock); | |
| 2856 | |
| 2857 #ifndef PRODUCT | |
| 2858 if (PrintLockStatistics) { | |
| 2859 // Update the counter for this lock. Don't bother using an atomic | |
| 2860 // operation since we don't require absolute accuracy. | |
| 2861 lock->create_lock_counter(map()->jvms()); | |
| 1609 | 2862 increment_counter(lock->counter()->addr()); |
| 0 | 2863 } |
| 2864 #endif | |
| 2865 | |
| 2866 return flock; | |
| 2867 } | |
| 2868 | |
| 2869 | |
| 2870 //------------------------------shared_unlock---------------------------------- | |
| 2871 // Emit unlocking code. | |
| 2872 void GraphKit::shared_unlock(Node* box, Node* obj) { | |
| 2873 // bci is either a monitorenter bc or InvocationEntryBci | |
| 2874 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
| 2875 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
| 2876 | |
| 2877 if( !GenerateSynchronizationCode ) | |
| 2878 return; | |
| 2879 if (stopped()) { // Dead monitor? | |
| 2880 map()->pop_monitor(); // Kill monitor from debug info | |
| 2881 return; | |
| 2882 } | |
| 2883 | |
| 2884 // Memory barrier to avoid floating things down past the locked region | |
| 2885 insert_mem_bar(Op_MemBarRelease); | |
| 2886 | |
| 2887 const TypeFunc *tf = OptoRuntime::complete_monitor_exit_Type(); | |
| 2888 UnlockNode *unlock = new (C, tf->domain()->cnt()) UnlockNode(C, tf); | |
| 2889 uint raw_idx = Compile::AliasIdxRaw; | |
| 2890 unlock->init_req( TypeFunc::Control, control() ); | |
| 2891 unlock->init_req( TypeFunc::Memory , memory(raw_idx) ); | |
| 2892 unlock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
| 2893 unlock->init_req( TypeFunc::FramePtr, frameptr() ); | |
| 2894 unlock->init_req( TypeFunc::ReturnAdr, top() ); | |
| 2895 | |
| 2896 unlock->init_req(TypeFunc::Parms + 0, obj); | |
| 2897 unlock->init_req(TypeFunc::Parms + 1, box); | |
| 2898 unlock = _gvn.transform(unlock)->as_Unlock(); | |
| 2899 | |
| 2900 Node* mem = reset_memory(); | |
| 2901 | |
| 2902 // unlock has no side-effects, sets few values | |
| 2903 set_predefined_output_for_runtime_call(unlock, mem, TypeRawPtr::BOTTOM); | |
| 2904 | |
| 2905 // Kill monitor from debug info | |
| 2906 map()->pop_monitor( ); | |
| 2907 } | |
| 2908 | |
| 2909 //-------------------------------get_layout_helper----------------------------- | |
| 2910 // If the given klass is a constant or known to be an array, | |
| 2911 // fetch the constant layout helper value into constant_value | |
| 2912 // and return (Node*)NULL. Otherwise, load the non-constant | |
| 2913 // layout helper value, and return the node which represents it. | |
| 2914 // This two-faced routine is useful because allocation sites | |
| 2915 // almost always feature constant types. | |
| 2916 Node* GraphKit::get_layout_helper(Node* klass_node, jint& constant_value) { | |
| 2917 const TypeKlassPtr* inst_klass = _gvn.type(klass_node)->isa_klassptr(); | |
| 2918 if (!StressReflectiveCode && inst_klass != NULL) { | |
| 2919 ciKlass* klass = inst_klass->klass(); | |
| 2920 bool xklass = inst_klass->klass_is_exact(); | |
| 2921 if (xklass || klass->is_array_klass()) { | |
| 2922 jint lhelper = klass->layout_helper(); | |
| 2923 if (lhelper != Klass::_lh_neutral_value) { | |
| 2924 constant_value = lhelper; | |
| 2925 return (Node*) NULL; | |
| 2926 } | |
| 2927 } | |
| 2928 } | |
| 2929 constant_value = Klass::_lh_neutral_value; // put in a known value | |
| 2930 Node* lhp = basic_plus_adr(klass_node, klass_node, Klass::layout_helper_offset_in_bytes() + sizeof(oopDesc)); | |
| 2931 return make_load(NULL, lhp, TypeInt::INT, T_INT); | |
| 2932 } | |
| 2933 | |
| 2934 // We just put in an allocate/initialize with a big raw-memory effect. | |
| 2935 // Hook selected additional alias categories on the initialization. | |
| 2936 static void hook_memory_on_init(GraphKit& kit, int alias_idx, | |
| 2937 MergeMemNode* init_in_merge, | |
| 2938 Node* init_out_raw) { | |
| 2939 DEBUG_ONLY(Node* init_in_raw = init_in_merge->base_memory()); | |
| 2940 assert(init_in_merge->memory_at(alias_idx) == init_in_raw, ""); | |
| 2941 | |
| 2942 Node* prevmem = kit.memory(alias_idx); | |
| 2943 init_in_merge->set_memory_at(alias_idx, prevmem); | |
| 2944 kit.set_memory(init_out_raw, alias_idx); | |
| 2945 } | |
| 2946 | |
| 2947 //---------------------------set_output_for_allocation------------------------- | |
| 2948 Node* GraphKit::set_output_for_allocation(AllocateNode* alloc, | |
|
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2949 const TypeOopPtr* oop_type) { |
| 0 | 2950 int rawidx = Compile::AliasIdxRaw; |
| 2951 alloc->set_req( TypeFunc::FramePtr, frameptr() ); | |
| 2952 add_safepoint_edges(alloc); | |
| 2953 Node* allocx = _gvn.transform(alloc); | |
| 2954 set_control( _gvn.transform(new (C, 1) ProjNode(allocx, TypeFunc::Control) ) ); | |
| 2955 // create memory projection for i_o | |
| 2956 set_memory ( _gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::Memory, true) ), rawidx ); | |
| 2957 make_slow_call_ex(allocx, env()->OutOfMemoryError_klass(), true); | |
| 2958 | |
| 2959 // create a memory projection as for the normal control path | |
| 2960 Node* malloc = _gvn.transform(new (C, 1) ProjNode(allocx, TypeFunc::Memory)); | |
| 2961 set_memory(malloc, rawidx); | |
| 2962 | |
| 2963 // a normal slow-call doesn't change i_o, but an allocation does | |
| 2964 // we create a separate i_o projection for the normal control path | |
| 2965 set_i_o(_gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::I_O, false) ) ); | |
| 2966 Node* rawoop = _gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::Parms) ); | |
| 2967 | |
| 2968 // put in an initialization barrier | |
| 2969 InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, rawidx, | |
| 2970 rawoop)->as_Initialize(); | |
| 2971 assert(alloc->initialization() == init, "2-way macro link must work"); | |
| 2972 assert(init ->allocation() == alloc, "2-way macro link must work"); | |
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2973 { |
| 0 | 2974 // Extract memory strands which may participate in the new object's |
| 2975 // initialization, and source them from the new InitializeNode. | |
| 2976 // This will allow us to observe initializations when they occur, | |
| 2977 // and link them properly (as a group) to the InitializeNode. | |
| 2978 assert(init->in(InitializeNode::Memory) == malloc, ""); | |
| 2979 MergeMemNode* minit_in = MergeMemNode::make(C, malloc); | |
| 2980 init->set_req(InitializeNode::Memory, minit_in); | |
| 2981 record_for_igvn(minit_in); // fold it up later, if possible | |
| 2982 Node* minit_out = memory(rawidx); | |
| 2983 assert(minit_out->is_Proj() && minit_out->in(0) == init, ""); | |
| 2984 if (oop_type->isa_aryptr()) { | |
| 2985 const TypePtr* telemref = oop_type->add_offset(Type::OffsetBot); | |
| 2986 int elemidx = C->get_alias_index(telemref); | |
| 2987 hook_memory_on_init(*this, elemidx, minit_in, minit_out); | |
| 2988 } else if (oop_type->isa_instptr()) { | |
| 2989 ciInstanceKlass* ik = oop_type->klass()->as_instance_klass(); | |
| 2990 for (int i = 0, len = ik->nof_nonstatic_fields(); i < len; i++) { | |
| 2991 ciField* field = ik->nonstatic_field_at(i); | |
|
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2992 if (field->offset() >= TrackedInitializationLimit * HeapWordSize) |
| 0 | 2993 continue; // do not bother to track really large numbers of fields |
| 2994 // Find (or create) the alias category for this field: | |
| 2995 int fieldidx = C->alias_type(field)->index(); | |
| 2996 hook_memory_on_init(*this, fieldidx, minit_in, minit_out); | |
| 2997 } | |
| 2998 } | |
| 2999 } | |
| 3000 | |
| 3001 // Cast raw oop to the real thing... | |
| 3002 Node* javaoop = new (C, 2) CheckCastPPNode(control(), rawoop, oop_type); | |
| 3003 javaoop = _gvn.transform(javaoop); | |
| 3004 C->set_recent_alloc(control(), javaoop); | |
| 3005 assert(just_allocated_object(control()) == javaoop, "just allocated"); | |
| 3006 | |
| 3007 #ifdef ASSERT | |
|
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3008 { // Verify that the AllocateNode::Ideal_allocation recognizers work: |
|
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3009 assert(AllocateNode::Ideal_allocation(rawoop, &_gvn) == alloc, |
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3010 "Ideal_allocation works"); |
|
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3011 assert(AllocateNode::Ideal_allocation(javaoop, &_gvn) == alloc, |
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3012 "Ideal_allocation works"); |
| 0 | 3013 if (alloc->is_AllocateArray()) { |
|
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3014 assert(AllocateArrayNode::Ideal_array_allocation(rawoop, &_gvn) == alloc->as_AllocateArray(), |
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3015 "Ideal_allocation works"); |
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3016 assert(AllocateArrayNode::Ideal_array_allocation(javaoop, &_gvn) == alloc->as_AllocateArray(), |
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3017 "Ideal_allocation works"); |
| 0 | 3018 } else { |
|
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3019 assert(alloc->in(AllocateNode::ALength)->is_top(), "no length, please"); |
| 0 | 3020 } |
| 3021 } | |
| 3022 #endif //ASSERT | |
| 3023 | |
| 3024 return javaoop; | |
| 3025 } | |
| 3026 | |
| 3027 //---------------------------new_instance-------------------------------------- | |
| 3028 // This routine takes a klass_node which may be constant (for a static type) | |
| 3029 // or may be non-constant (for reflective code). It will work equally well | |
| 3030 // for either, and the graph will fold nicely if the optimizer later reduces | |
| 3031 // the type to a constant. | |
| 3032 // The optional arguments are for specialized use by intrinsics: | |
| 3033 // - If 'extra_slow_test' if not null is an extra condition for the slow-path. | |
| 3034 // - If 'return_size_val', report the the total object size to the caller. | |
| 3035 Node* GraphKit::new_instance(Node* klass_node, | |
| 3036 Node* extra_slow_test, | |
| 3037 Node* *return_size_val) { | |
| 3038 // Compute size in doublewords | |
| 3039 // The size is always an integral number of doublewords, represented | |
| 3040 // as a positive bytewise size stored in the klass's layout_helper. | |
| 3041 // The layout_helper also encodes (in a low bit) the need for a slow path. | |
| 3042 jint layout_con = Klass::_lh_neutral_value; | |
| 3043 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
| 3044 int layout_is_con = (layout_val == NULL); | |
| 3045 | |
| 3046 if (extra_slow_test == NULL) extra_slow_test = intcon(0); | |
| 3047 // Generate the initial go-slow test. It's either ALWAYS (return a | |
| 3048 // Node for 1) or NEVER (return a NULL) or perhaps (in the reflective | |
| 3049 // case) a computed value derived from the layout_helper. | |
| 3050 Node* initial_slow_test = NULL; | |
| 3051 if (layout_is_con) { | |
| 3052 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
| 3053 bool must_go_slow = Klass::layout_helper_needs_slow_path(layout_con); | |
| 3054 initial_slow_test = must_go_slow? intcon(1): extra_slow_test; | |
| 3055 | |
| 3056 } else { // reflective case | |
| 3057 // This reflective path is used by Unsafe.allocateInstance. | |
| 3058 // (It may be stress-tested by specifying StressReflectiveCode.) | |
| 3059 // Basically, we want to get into the VM is there's an illegal argument. | |
| 3060 Node* bit = intcon(Klass::_lh_instance_slow_path_bit); | |
| 3061 initial_slow_test = _gvn.transform( new (C, 3) AndINode(layout_val, bit) ); | |
| 3062 if (extra_slow_test != intcon(0)) { | |
| 3063 initial_slow_test = _gvn.transform( new (C, 3) OrINode(initial_slow_test, extra_slow_test) ); | |
| 3064 } | |
| 3065 // (Macro-expander will further convert this to a Bool, if necessary.) | |
| 3066 } | |
| 3067 | |
| 3068 // Find the size in bytes. This is easy; it's the layout_helper. | |
| 3069 // The size value must be valid even if the slow path is taken. | |
| 3070 Node* size = NULL; | |
| 3071 if (layout_is_con) { | |
| 3072 size = MakeConX(Klass::layout_helper_size_in_bytes(layout_con)); | |
| 3073 } else { // reflective case | |
| 3074 // This reflective path is used by clone and Unsafe.allocateInstance. | |
| 3075 size = ConvI2X(layout_val); | |
| 3076 | |
| 3077 // Clear the low bits to extract layout_helper_size_in_bytes: | |
| 3078 assert((int)Klass::_lh_instance_slow_path_bit < BytesPerLong, "clear bit"); | |
| 3079 Node* mask = MakeConX(~ (intptr_t)right_n_bits(LogBytesPerLong)); | |
| 3080 size = _gvn.transform( new (C, 3) AndXNode(size, mask) ); | |
| 3081 } | |
| 3082 if (return_size_val != NULL) { | |
| 3083 (*return_size_val) = size; | |
| 3084 } | |
| 3085 | |
| 3086 // This is a precise notnull oop of the klass. | |
| 3087 // (Actually, it need not be precise if this is a reflective allocation.) | |
| 3088 // It's what we cast the result to. | |
| 3089 const TypeKlassPtr* tklass = _gvn.type(klass_node)->isa_klassptr(); | |
| 3090 if (!tklass) tklass = TypeKlassPtr::OBJECT; | |
| 3091 const TypeOopPtr* oop_type = tklass->as_instance_type(); | |
| 3092 | |
| 3093 // Now generate allocation code | |
|
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3094 |
|
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3095 // The entire memory state is needed for slow path of the allocation |
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3096 // since GC and deoptimization can happened. |
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3097 Node *mem = reset_memory(); |
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3098 set_all_memory(mem); // Create new memory state |
|
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3099 |
| 0 | 3100 AllocateNode* alloc |
| 3101 = new (C, AllocateNode::ParmLimit) | |
| 3102 AllocateNode(C, AllocateNode::alloc_type(), | |
|
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|
3103 control(), mem, i_o(), |
| 0 | 3104 size, klass_node, |
| 3105 initial_slow_test); | |
| 3106 | |
|
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|
3107 return set_output_for_allocation(alloc, oop_type); |
| 0 | 3108 } |
| 3109 | |
| 3110 //-------------------------------new_array------------------------------------- | |
| 3111 // helper for both newarray and anewarray | |
| 3112 // The 'length' parameter is (obviously) the length of the array. | |
| 3113 // See comments on new_instance for the meaning of the other arguments. | |
| 3114 Node* GraphKit::new_array(Node* klass_node, // array klass (maybe variable) | |
| 3115 Node* length, // number of array elements | |
|
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3116 int nargs, // number of arguments to push back for uncommon trap |
| 0 | 3117 Node* *return_size_val) { |
| 3118 jint layout_con = Klass::_lh_neutral_value; | |
| 3119 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
| 3120 int layout_is_con = (layout_val == NULL); | |
| 3121 | |
| 3122 if (!layout_is_con && !StressReflectiveCode && | |
| 3123 !too_many_traps(Deoptimization::Reason_class_check)) { | |
| 3124 // This is a reflective array creation site. | |
| 3125 // Optimistically assume that it is a subtype of Object[], | |
| 3126 // so that we can fold up all the address arithmetic. | |
| 3127 layout_con = Klass::array_layout_helper(T_OBJECT); | |
| 3128 Node* cmp_lh = _gvn.transform( new(C, 3) CmpINode(layout_val, intcon(layout_con)) ); | |
| 3129 Node* bol_lh = _gvn.transform( new(C, 2) BoolNode(cmp_lh, BoolTest::eq) ); | |
| 3130 { BuildCutout unless(this, bol_lh, PROB_MAX); | |
|
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3131 _sp += nargs; |
| 0 | 3132 uncommon_trap(Deoptimization::Reason_class_check, |
| 3133 Deoptimization::Action_maybe_recompile); | |
| 3134 } | |
| 3135 layout_val = NULL; | |
| 3136 layout_is_con = true; | |
| 3137 } | |
| 3138 | |
| 3139 // Generate the initial go-slow test. Make sure we do not overflow | |
| 3140 // if length is huge (near 2Gig) or negative! We do not need | |
| 3141 // exact double-words here, just a close approximation of needed | |
| 3142 // double-words. We can't add any offset or rounding bits, lest we | |
| 3143 // take a size -1 of bytes and make it positive. Use an unsigned | |
| 3144 // compare, so negative sizes look hugely positive. | |
| 3145 int fast_size_limit = FastAllocateSizeLimit; | |
| 3146 if (layout_is_con) { | |
| 3147 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
| 3148 // Increase the size limit if we have exact knowledge of array type. | |
| 3149 int log2_esize = Klass::layout_helper_log2_element_size(layout_con); | |
| 3150 fast_size_limit <<= (LogBytesPerLong - log2_esize); | |
| 3151 } | |
| 3152 | |
| 3153 Node* initial_slow_cmp = _gvn.transform( new (C, 3) CmpUNode( length, intcon( fast_size_limit ) ) ); | |
| 3154 Node* initial_slow_test = _gvn.transform( new (C, 2) BoolNode( initial_slow_cmp, BoolTest::gt ) ); | |
| 3155 if (initial_slow_test->is_Bool()) { | |
| 3156 // Hide it behind a CMoveI, or else PhaseIdealLoop::split_up will get sick. | |
| 3157 initial_slow_test = initial_slow_test->as_Bool()->as_int_value(&_gvn); | |
| 3158 } | |
| 3159 | |
| 3160 // --- Size Computation --- | |
| 3161 // array_size = round_to_heap(array_header + (length << elem_shift)); | |
| 3162 // where round_to_heap(x) == round_to(x, MinObjAlignmentInBytes) | |
| 3163 // and round_to(x, y) == ((x + y-1) & ~(y-1)) | |
| 3164 // The rounding mask is strength-reduced, if possible. | |
| 3165 int round_mask = MinObjAlignmentInBytes - 1; | |
| 3166 Node* header_size = NULL; | |
| 3167 int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
| 3168 // (T_BYTE has the weakest alignment and size restrictions...) | |
| 3169 if (layout_is_con) { | |
| 3170 int hsize = Klass::layout_helper_header_size(layout_con); | |
| 3171 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
| 3172 BasicType etype = Klass::layout_helper_element_type(layout_con); | |
| 3173 if ((round_mask & ~right_n_bits(eshift)) == 0) | |
| 3174 round_mask = 0; // strength-reduce it if it goes away completely | |
| 3175 assert((hsize & right_n_bits(eshift)) == 0, "hsize is pre-rounded"); | |
| 3176 assert(header_size_min <= hsize, "generic minimum is smallest"); | |
| 3177 header_size_min = hsize; | |
| 3178 header_size = intcon(hsize + round_mask); | |
| 3179 } else { | |
| 3180 Node* hss = intcon(Klass::_lh_header_size_shift); | |
| 3181 Node* hsm = intcon(Klass::_lh_header_size_mask); | |
| 3182 Node* hsize = _gvn.transform( new(C, 3) URShiftINode(layout_val, hss) ); | |
| 3183 hsize = _gvn.transform( new(C, 3) AndINode(hsize, hsm) ); | |
| 3184 Node* mask = intcon(round_mask); | |
| 3185 header_size = _gvn.transform( new(C, 3) AddINode(hsize, mask) ); | |
| 3186 } | |
| 3187 | |
| 3188 Node* elem_shift = NULL; | |
| 3189 if (layout_is_con) { | |
| 3190 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
| 3191 if (eshift != 0) | |
| 3192 elem_shift = intcon(eshift); | |
| 3193 } else { | |
| 3194 // There is no need to mask or shift this value. | |
| 3195 // The semantics of LShiftINode include an implicit mask to 0x1F. | |
| 3196 assert(Klass::_lh_log2_element_size_shift == 0, "use shift in place"); | |
| 3197 elem_shift = layout_val; | |
| 3198 } | |
| 3199 | |
| 3200 // Transition to native address size for all offset calculations: | |
| 3201 Node* lengthx = ConvI2X(length); | |
| 3202 Node* headerx = ConvI2X(header_size); | |
| 3203 #ifdef _LP64 | |
| 3204 { const TypeLong* tllen = _gvn.find_long_type(lengthx); | |
| 3205 if (tllen != NULL && tllen->_lo < 0) { | |
| 3206 // Add a manual constraint to a positive range. Cf. array_element_address. | |
| 3207 jlong size_max = arrayOopDesc::max_array_length(T_BYTE); | |
| 3208 if (size_max > tllen->_hi) size_max = tllen->_hi; | |
| 3209 const TypeLong* tlcon = TypeLong::make(CONST64(0), size_max, Type::WidenMin); | |
| 3210 lengthx = _gvn.transform( new (C, 2) ConvI2LNode(length, tlcon)); | |
| 3211 } | |
| 3212 } | |
| 3213 #endif | |
| 3214 | |
| 3215 // Combine header size (plus rounding) and body size. Then round down. | |
| 3216 // This computation cannot overflow, because it is used only in two | |
| 3217 // places, one where the length is sharply limited, and the other | |
| 3218 // after a successful allocation. | |
| 3219 Node* abody = lengthx; | |
| 3220 if (elem_shift != NULL) | |
| 3221 abody = _gvn.transform( new(C, 3) LShiftXNode(lengthx, elem_shift) ); | |
| 3222 Node* size = _gvn.transform( new(C, 3) AddXNode(headerx, abody) ); | |
| 3223 if (round_mask != 0) { | |
| 3224 Node* mask = MakeConX(~round_mask); | |
| 3225 size = _gvn.transform( new(C, 3) AndXNode(size, mask) ); | |
| 3226 } | |
| 3227 // else if round_mask == 0, the size computation is self-rounding | |
| 3228 | |
| 3229 if (return_size_val != NULL) { | |
| 3230 // This is the size | |
| 3231 (*return_size_val) = size; | |
| 3232 } | |
| 3233 | |
| 3234 // Now generate allocation code | |
|
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3235 |
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3236 // The entire memory state is needed for slow path of the allocation |
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3237 // since GC and deoptimization can happened. |
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3238 Node *mem = reset_memory(); |
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3239 set_all_memory(mem); // Create new memory state |
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3240 |
| 0 | 3241 // Create the AllocateArrayNode and its result projections |
| 3242 AllocateArrayNode* alloc | |
| 3243 = new (C, AllocateArrayNode::ParmLimit) | |
| 3244 AllocateArrayNode(C, AllocateArrayNode::alloc_type(), | |
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3245 control(), mem, i_o(), |
| 0 | 3246 size, klass_node, |
| 3247 initial_slow_test, | |
| 3248 length); | |
| 3249 | |
| 3250 // Cast to correct type. Note that the klass_node may be constant or not, | |
| 3251 // and in the latter case the actual array type will be inexact also. | |
| 3252 // (This happens via a non-constant argument to inline_native_newArray.) | |
| 3253 // In any case, the value of klass_node provides the desired array type. | |
| 3254 const TypeInt* length_type = _gvn.find_int_type(length); | |
| 3255 const TypeOopPtr* ary_type = _gvn.type(klass_node)->is_klassptr()->as_instance_type(); | |
| 3256 if (ary_type->isa_aryptr() && length_type != NULL) { | |
| 3257 // Try to get a better type than POS for the size | |
| 3258 ary_type = ary_type->is_aryptr()->cast_to_size(length_type); | |
| 3259 } | |
| 3260 | |
|
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3261 Node* javaoop = set_output_for_allocation(alloc, ary_type); |
| 0 | 3262 |
|
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3263 // Cast length on remaining path to be as narrow as possible |
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3264 if (map()->find_edge(length) >= 0) { |
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3265 Node* ccast = alloc->make_ideal_length(ary_type, &_gvn); |
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3266 if (ccast != length) { |
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3267 _gvn.set_type_bottom(ccast); |
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3268 record_for_igvn(ccast); |
| 0 | 3269 replace_in_map(length, ccast); |
| 3270 } | |
| 3271 } | |
| 3272 | |
| 3273 return javaoop; | |
| 3274 } | |
| 3275 | |
| 3276 // The following "Ideal_foo" functions are placed here because they recognize | |
| 3277 // the graph shapes created by the functions immediately above. | |
| 3278 | |
| 3279 //---------------------------Ideal_allocation---------------------------------- | |
| 3280 // Given an oop pointer or raw pointer, see if it feeds from an AllocateNode. | |
| 3281 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase) { | |
| 3282 if (ptr == NULL) { // reduce dumb test in callers | |
| 3283 return NULL; | |
| 3284 } | |
| 3285 if (ptr->is_CheckCastPP()) { // strip a raw-to-oop cast | |
| 3286 ptr = ptr->in(1); | |
| 3287 if (ptr == NULL) return NULL; | |
| 3288 } | |
| 3289 if (ptr->is_Proj()) { | |
| 3290 Node* allo = ptr->in(0); | |
| 3291 if (allo != NULL && allo->is_Allocate()) { | |
| 3292 return allo->as_Allocate(); | |
| 3293 } | |
| 3294 } | |
| 3295 // Report failure to match. | |
| 3296 return NULL; | |
| 3297 } | |
| 3298 | |
| 3299 // Fancy version which also strips off an offset (and reports it to caller). | |
| 3300 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase, | |
| 3301 intptr_t& offset) { | |
| 3302 Node* base = AddPNode::Ideal_base_and_offset(ptr, phase, offset); | |
| 3303 if (base == NULL) return NULL; | |
| 3304 return Ideal_allocation(base, phase); | |
| 3305 } | |
| 3306 | |
| 3307 // Trace Initialize <- Proj[Parm] <- Allocate | |
| 3308 AllocateNode* InitializeNode::allocation() { | |
| 3309 Node* rawoop = in(InitializeNode::RawAddress); | |
| 3310 if (rawoop->is_Proj()) { | |
| 3311 Node* alloc = rawoop->in(0); | |
| 3312 if (alloc->is_Allocate()) { | |
| 3313 return alloc->as_Allocate(); | |
| 3314 } | |
| 3315 } | |
| 3316 return NULL; | |
| 3317 } | |
| 3318 | |
| 3319 // Trace Allocate -> Proj[Parm] -> Initialize | |
| 3320 InitializeNode* AllocateNode::initialization() { | |
| 3321 ProjNode* rawoop = proj_out(AllocateNode::RawAddress); | |
| 3322 if (rawoop == NULL) return NULL; | |
| 3323 for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) { | |
| 3324 Node* init = rawoop->fast_out(i); | |
| 3325 if (init->is_Initialize()) { | |
| 3326 assert(init->as_Initialize()->allocation() == this, "2-way link"); | |
| 3327 return init->as_Initialize(); | |
| 3328 } | |
| 3329 } | |
| 3330 return NULL; | |
| 3331 } | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3332 |
|
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3333 //----------------------------- loop predicates --------------------------- |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3334 |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3335 //------------------------------add_predicate_impl---------------------------- |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3336 void GraphKit::add_predicate_impl(Deoptimization::DeoptReason reason, int nargs) { |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3337 // Too many traps seen? |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3338 if (too_many_traps(reason)) { |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3339 #ifdef ASSERT |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3340 if (TraceLoopPredicate) { |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3341 int tc = C->trap_count(reason); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3342 tty->print("too many traps=%s tcount=%d in ", |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3343 Deoptimization::trap_reason_name(reason), tc); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3344 method()->print(); // which method has too many predicate traps |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3345 tty->cr(); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3346 } |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3347 #endif |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3348 // We cannot afford to take more traps here, |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3349 // do not generate predicate. |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3350 return; |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3351 } |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3352 |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3353 Node *cont = _gvn.intcon(1); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3354 Node* opq = _gvn.transform(new (C, 2) Opaque1Node(C, cont)); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3355 Node *bol = _gvn.transform(new (C, 2) Conv2BNode(opq)); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3356 IfNode* iff = create_and_map_if(control(), bol, PROB_MAX, COUNT_UNKNOWN); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3357 Node* iffalse = _gvn.transform(new (C, 1) IfFalseNode(iff)); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3358 C->add_predicate_opaq(opq); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3359 { |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3360 PreserveJVMState pjvms(this); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3361 set_control(iffalse); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3362 _sp += nargs; |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3363 uncommon_trap(reason, Deoptimization::Action_maybe_recompile); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3364 } |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3365 Node* iftrue = _gvn.transform(new (C, 1) IfTrueNode(iff)); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3366 set_control(iftrue); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3367 } |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3368 |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3369 //------------------------------add_predicate--------------------------------- |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3370 void GraphKit::add_predicate(int nargs) { |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3371 if (UseLoopPredicate) { |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3372 add_predicate_impl(Deoptimization::Reason_predicate, nargs); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3373 } |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3374 } |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3375 |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3376 //----------------------------- store barriers ---------------------------- |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3377 #define __ ideal. |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3378 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3379 void GraphKit::sync_kit(IdealKit& ideal) { |
|
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3380 set_all_memory(__ merged_memory()); |
|
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3381 set_i_o(__ i_o()); |
|
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3382 set_control(__ ctrl()); |
|
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3383 } |
|
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3384 |
|
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3385 void GraphKit::final_sync(IdealKit& ideal) { |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3386 // Final sync IdealKit and graphKit. |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3387 __ drain_delay_transform(); |
|
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3388 sync_kit(ideal); |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3389 } |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3390 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3391 // vanilla/CMS post barrier |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3392 // Insert a write-barrier store. This is to let generational GC work; we have |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3393 // to flag all oop-stores before the next GC point. |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3394 void GraphKit::write_barrier_post(Node* oop_store, |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3395 Node* obj, |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3396 Node* adr, |
|
985
685e959d09ea
6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
cfang
parents:
955
diff
changeset
|
3397 uint adr_idx, |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3398 Node* val, |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3399 bool use_precise) { |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3400 // No store check needed if we're storing a NULL or an old object |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3401 // (latter case is probably a string constant). The concurrent |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3402 // mark sweep garbage collector, however, needs to have all nonNull |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3403 // oop updates flagged via card-marks. |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3404 if (val != NULL && val->is_Con()) { |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3405 // must be either an oop or NULL |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3406 const Type* t = val->bottom_type(); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3407 if (t == TypePtr::NULL_PTR || t == Type::TOP) |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3408 // stores of null never (?) need barriers |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3409 return; |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3410 ciObject* con = t->is_oopptr()->const_oop(); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3411 if (con != NULL |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3412 && con->is_perm() |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3413 && Universe::heap()->can_elide_permanent_oop_store_barriers()) |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3414 // no store barrier needed, because no old-to-new ref created |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3415 return; |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3416 } |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3417 |
|
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3418 if (use_ReduceInitialCardMarks() |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3419 && obj == just_allocated_object(control())) { |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3420 // We can skip marks on a freshly-allocated object in Eden. |
| 1166 | 3421 // Keep this code in sync with new_store_pre_barrier() in runtime.cpp. |
| 3422 // That routine informs GC to take appropriate compensating steps, | |
| 3423 // upon a slow-path allocation, so as to make this card-mark | |
| 3424 // elision safe. | |
|
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3425 return; |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3426 } |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3427 |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3428 if (!use_precise) { |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3429 // All card marks for a (non-array) instance are in one place: |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3430 adr = obj; |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3431 } |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3432 // (Else it's an array (or unknown), and we want more precise card marks.) |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3433 assert(adr != NULL, ""); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3434 |
|
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3435 IdealKit ideal(this, true); |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3436 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3437 // Convert the pointer to an int prior to doing math on it |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3438 Node* cast = __ CastPX(__ ctrl(), adr); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3439 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3440 // Divide by card size |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3441 assert(Universe::heap()->barrier_set()->kind() == BarrierSet::CardTableModRef, |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3442 "Only one we handle so far."); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3443 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3444 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3445 // Combine card table base and card offset |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3446 Node* card_adr = __ AddP(__ top(), byte_map_base_node(), card_offset ); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3447 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3448 // Get the alias_index for raw card-mark memory |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3449 int adr_type = Compile::AliasIdxRaw; |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3450 // Smash zero into card |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3451 Node* zero = __ ConI(0); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3452 BasicType bt = T_BYTE; |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3453 if( !UseConcMarkSweepGC ) { |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3454 __ store(__ ctrl(), card_adr, zero, bt, adr_type); |
|
fc4be448891f
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3455 } else { |
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3456 // Specialized path for CM store barrier |
|
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3457 __ storeCM(__ ctrl(), card_adr, zero, oop_store, adr_idx, bt, adr_type); |
|
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3458 } |
|
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3459 |
|
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3460 // Final sync IdealKit and GraphKit. |
|
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3461 final_sync(ideal); |
|
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3462 } |
|
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3463 |
|
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3464 // G1 pre/post barriers |
|
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3465 void GraphKit::g1_write_barrier_pre(Node* obj, |
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3466 Node* adr, |
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3467 uint alias_idx, |
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3468 Node* val, |
| 825 | 3469 const TypeOopPtr* val_type, |
|
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3470 BasicType bt) { |
|
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3471 IdealKit ideal(this, true); |
|
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3472 |
|
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3473 Node* tls = __ thread(); // ThreadLocalStorage |
|
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3474 |
|
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3475 Node* no_ctrl = NULL; |
|
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3476 Node* no_base = __ top(); |
|
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3477 Node* zero = __ ConI(0); |
|
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3478 |
|
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3479 float likely = PROB_LIKELY(0.999); |
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3480 float unlikely = PROB_UNLIKELY(0.999); |
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3481 |
|
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3482 BasicType active_type = in_bytes(PtrQueue::byte_width_of_active()) == 4 ? T_INT : T_BYTE; |
|
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3483 assert(in_bytes(PtrQueue::byte_width_of_active()) == 4 || in_bytes(PtrQueue::byte_width_of_active()) == 1, "flag width"); |
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3484 |
|
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3485 // Offsets into the thread |
|
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3486 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 648 |
|
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3487 PtrQueue::byte_offset_of_active()); |
|
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3488 const int index_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 656 |
|
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3489 PtrQueue::byte_offset_of_index()); |
|
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3490 const int buffer_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 652 |
|
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3491 PtrQueue::byte_offset_of_buf()); |
|
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3492 // Now the actual pointers into the thread |
|
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3493 |
|
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3494 // set_control( ctl); |
|
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3495 |
|
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3496 Node* marking_adr = __ AddP(no_base, tls, __ ConX(marking_offset)); |
|
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3497 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
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3498 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
|
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3499 |
|
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3500 // Now some of the values |
|
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3501 |
|
544
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|
3502 Node* marking = __ load(__ ctrl(), marking_adr, TypeInt::INT, active_type, Compile::AliasIdxRaw); |
|
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3503 |
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3504 // if (!marking) |
|
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|
3505 __ if_then(marking, BoolTest::ne, zero); { |
|
544
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|
3506 Node* index = __ load(__ ctrl(), index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); |
|
342
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3507 |
|
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3508 const Type* t1 = adr->bottom_type(); |
|
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3509 const Type* t2 = val->bottom_type(); |
|
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3510 |
|
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|
3511 Node* orig = __ load(no_ctrl, adr, val_type, bt, alias_idx); |
|
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|
3512 // if (orig != NULL) |
|
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|
3513 __ if_then(orig, BoolTest::ne, null()); { |
|
544
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|
3514 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
|
342
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|
3515 |
|
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|
3516 // load original value |
|
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|
3517 // alias_idx correct?? |
|
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|
3518 |
|
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|
3519 // is the queue for this thread full? |
|
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|
3520 __ if_then(index, BoolTest::ne, zero, likely); { |
|
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|
3521 |
|
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|
3522 // decrement the index |
|
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|
3523 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); |
|
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|
3524 Node* next_indexX = next_index; |
|
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|
3525 #ifdef _LP64 |
|
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|
3526 // We could refine the type for what it's worth |
|
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|
3527 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); |
|
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|
3528 next_indexX = _gvn.transform( new (C, 2) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); |
|
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|
3529 #endif |
|
342
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3530 |
|
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|
3531 // Now get the buffer location we will log the original value into and store it |
|
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|
3532 Node *log_addr = __ AddP(no_base, buffer, next_indexX); |
|
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3533 __ store(__ ctrl(), log_addr, orig, T_OBJECT, Compile::AliasIdxRaw); |
|
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|
3534 |
|
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|
3535 // update the index |
|
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|
3536 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); |
|
342
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|
3537 |
|
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|
3538 } __ else_(); { |
|
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|
3539 |
|
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|
3540 // logging buffer is full, call the runtime |
|
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|
3541 const TypeFunc *tf = OptoRuntime::g1_wb_pre_Type(); |
|
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|
3542 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), "g1_wb_pre", orig, tls); |
|
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|
3543 } __ end_if(); // (!index) |
|
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|
3544 } __ end_if(); // (orig != NULL) |
|
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|
3545 } __ end_if(); // (!marking) |
|
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|
3546 |
|
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|
3547 // Final sync IdealKit and GraphKit. |
|
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|
3548 final_sync(ideal); |
|
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|
3549 } |
|
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|
3550 |
|
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|
3551 // |
|
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|
3552 // Update the card table and add card address to the queue |
|
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|
3553 // |
|
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|
3554 void GraphKit::g1_mark_card(IdealKit& ideal, |
|
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|
3555 Node* card_adr, |
|
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|
3556 Node* oop_store, |
|
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|
3557 uint oop_alias_idx, |
|
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|
3558 Node* index, |
|
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|
3559 Node* index_adr, |
|
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|
3560 Node* buffer, |
|
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|
3561 const TypeFunc* tf) { |
|
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|
3562 |
|
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|
3563 Node* zero = __ ConI(0); |
|
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|
3564 Node* no_base = __ top(); |
|
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|
3565 BasicType card_bt = T_BYTE; |
|
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|
3566 // Smash zero into card. MUST BE ORDERED WRT TO STORE |
|
985
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|
3567 __ storeCM(__ ctrl(), card_adr, zero, oop_store, oop_alias_idx, card_bt, Compile::AliasIdxRaw); |
|
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3568 |
|
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|
3569 // Now do the queue work |
|
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|
3570 __ if_then(index, BoolTest::ne, zero); { |
|
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|
3571 |
|
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3572 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); |
|
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3573 Node* next_indexX = next_index; |
|
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|
3574 #ifdef _LP64 |
|
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|
3575 // We could refine the type for what it's worth |
|
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|
3576 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); |
|
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|
3577 next_indexX = _gvn.transform( new (C, 2) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); |
|
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3578 #endif // _LP64 |
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3579 Node* log_addr = __ AddP(no_base, buffer, next_indexX); |
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3580 |
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3581 __ store(__ ctrl(), log_addr, card_adr, T_ADDRESS, Compile::AliasIdxRaw); |
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3582 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); |
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3583 |
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3584 } __ else_(); { |
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3585 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), "g1_wb_post", card_adr, __ thread()); |
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3586 } __ end_if(); |
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3587 |
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3588 } |
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3589 |
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3590 void GraphKit::g1_write_barrier_post(Node* oop_store, |
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3591 Node* obj, |
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3592 Node* adr, |
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3593 uint alias_idx, |
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3594 Node* val, |
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3595 BasicType bt, |
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3596 bool use_precise) { |
|
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3597 // If we are writing a NULL then we need no post barrier |
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3598 |
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3599 if (val != NULL && val->is_Con() && val->bottom_type() == TypePtr::NULL_PTR) { |
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3600 // Must be NULL |
|
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3601 const Type* t = val->bottom_type(); |
|
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3602 assert(t == Type::TOP || t == TypePtr::NULL_PTR, "must be NULL"); |
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3603 // No post barrier if writing NULLx |
|
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3604 return; |
|
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3605 } |
|
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3606 |
|
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3607 if (!use_precise) { |
|
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3608 // All card marks for a (non-array) instance are in one place: |
|
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3609 adr = obj; |
|
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3610 } |
|
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3611 // (Else it's an array (or unknown), and we want more precise card marks.) |
|
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3612 assert(adr != NULL, ""); |
|
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3613 |
|
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3614 IdealKit ideal(this, true); |
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3615 |
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3616 Node* tls = __ thread(); // ThreadLocalStorage |
|
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3617 |
|
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3618 Node* no_base = __ top(); |
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3619 float likely = PROB_LIKELY(0.999); |
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3620 float unlikely = PROB_UNLIKELY(0.999); |
|
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3621 Node* zero = __ ConI(0); |
|
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3622 Node* zeroX = __ ConX(0); |
|
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3623 |
|
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3624 // Get the alias_index for raw card-mark memory |
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3625 const TypePtr* card_type = TypeRawPtr::BOTTOM; |
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3626 |
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3627 const TypeFunc *tf = OptoRuntime::g1_wb_post_Type(); |
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3628 |
|
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3629 // Offsets into the thread |
|
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3630 const int index_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
|
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3631 PtrQueue::byte_offset_of_index()); |
|
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3632 const int buffer_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
|
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3633 PtrQueue::byte_offset_of_buf()); |
|
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3634 |
|
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3635 // Pointers into the thread |
|
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|
3636 |
|
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3637 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
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3638 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
|
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3639 |
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|
3640 // Now some values |
|
1593
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diff
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|
3641 // Use ctrl to avoid hoisting these values past a safepoint, which could |
|
2458a1f25356
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|
3642 // potentially reset these fields in the JavaThread. |
|
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|
3643 Node* index = __ load(__ ctrl(), index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); |
|
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3644 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
|
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3645 |
|
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3646 // Convert the store obj pointer to an int prior to doing math on it |
|
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3647 // Must use ctrl to prevent "integerized oop" existing across safepoint |
|
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3648 Node* cast = __ CastPX(__ ctrl(), adr); |
|
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3649 |
|
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3650 // Divide pointer by card size |
|
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|
3651 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
|
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3652 |
|
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|
3653 // Combine card table base and card offset |
|
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3654 Node* card_adr = __ AddP(no_base, byte_map_base_node(), card_offset ); |
|
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3655 |
|
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|
3656 // If we know the value being stored does it cross regions? |
|
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|
3657 |
|
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|
3658 if (val != NULL) { |
|
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|
3659 // Does the store cause us to cross regions? |
|
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|
3660 |
|
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|
3661 // Should be able to do an unsigned compare of region_size instead of |
|
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3662 // and extra shift. Do we have an unsigned compare?? |
|
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3663 // Node* region_size = __ ConI(1 << HeapRegion::LogOfHRGrainBytes); |
|
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3664 Node* xor_res = __ URShiftX ( __ XorX( cast, __ CastPX(__ ctrl(), val)), __ ConI(HeapRegion::LogOfHRGrainBytes)); |
|
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|
3665 |
|
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|
3666 // if (xor_res == 0) same region so skip |
|
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3667 __ if_then(xor_res, BoolTest::ne, zeroX); { |
|
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|
3668 |
|
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3669 // No barrier if we are storing a NULL |
|
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3670 __ if_then(val, BoolTest::ne, null(), unlikely); { |
|
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|
3671 |
|
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|
3672 // Ok must mark the card if not already dirty |
|
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|
3673 |
|
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3674 // load the original value of the card |
|
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|
3675 Node* card_val = __ load(__ ctrl(), card_adr, TypeInt::INT, T_BYTE, Compile::AliasIdxRaw); |
|
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3676 |
|
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3677 __ if_then(card_val, BoolTest::ne, zero); { |
|
985
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|
3678 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); |
|
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3679 } __ end_if(); |
|
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3680 } __ end_if(); |
|
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3681 } __ end_if(); |
|
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3682 } else { |
|
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3683 // Object.clone() instrinsic uses this path. |
|
985
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|
3684 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); |
|
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3685 } |
|
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|
3686 |
|
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3687 // Final sync IdealKit and GraphKit. |
|
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|
3688 final_sync(ideal); |
|
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3689 } |
|
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3690 #undef __ |