Mercurial > hg > truffle
annotate src/share/vm/opto/graphKit.cpp @ 10278:6f3fd5150b67
6934604: enable parts of EliminateAutoBox by default
Summary: Resurrected autobox elimination code and enabled part of it by default.
Reviewed-by: roland, twisti
| author | kvn |
|---|---|
| date | Wed, 08 May 2013 15:08:01 -0700 |
| parents | d50cc62e94ff |
| children | 836a62f43af9 2b3fe74309b6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 6057 | 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "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 | |
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96 //--------------------------------sync_jvms_for_reexecute--------------------- |
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97 // Make sure our current jvms agrees with our parse state. This version |
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98 // uses the reexecute_sp for reexecuting bytecodes. |
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99 JVMState* GraphKit::sync_jvms_for_reexecute() { |
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100 JVMState* jvms = this->jvms(); |
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101 jvms->set_bci(bci()); // Record the new bci in the JVMState |
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102 jvms->set_sp(reexecute_sp()); // Record the new sp in the JVMState |
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103 return jvms; |
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104 } |
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105 |
| 0 | 106 #ifdef ASSERT |
| 107 bool GraphKit::jvms_in_sync() const { | |
| 108 Parse* parse = is_Parse(); | |
| 109 if (parse == NULL) { | |
| 110 if (bci() != jvms()->bci()) return false; | |
| 111 if (sp() != (int)jvms()->sp()) return false; | |
| 112 return true; | |
| 113 } | |
| 114 if (jvms()->method() != parse->method()) return false; | |
| 115 if (jvms()->bci() != parse->bci()) return false; | |
| 116 int jvms_sp = jvms()->sp(); | |
| 117 if (jvms_sp != parse->sp()) return false; | |
| 118 int jvms_depth = jvms()->depth(); | |
| 119 if (jvms_depth != parse->depth()) return false; | |
| 120 return true; | |
| 121 } | |
| 122 | |
| 123 // Local helper checks for special internal merge points | |
| 124 // used to accumulate and merge exception states. | |
| 125 // They are marked by the region's in(0) edge being the map itself. | |
| 126 // Such merge points must never "escape" into the parser at large, | |
| 127 // until they have been handed to gvn.transform. | |
| 128 static bool is_hidden_merge(Node* reg) { | |
| 129 if (reg == NULL) return false; | |
| 130 if (reg->is_Phi()) { | |
| 131 reg = reg->in(0); | |
| 132 if (reg == NULL) return false; | |
| 133 } | |
| 134 return reg->is_Region() && reg->in(0) != NULL && reg->in(0)->is_Root(); | |
| 135 } | |
| 136 | |
| 137 void GraphKit::verify_map() const { | |
| 138 if (map() == NULL) return; // null map is OK | |
| 139 assert(map()->req() <= jvms()->endoff(), "no extra garbage on map"); | |
| 140 assert(!map()->has_exceptions(), "call add_exception_states_from 1st"); | |
| 141 assert(!is_hidden_merge(control()), "call use_exception_state, not set_map"); | |
| 142 } | |
| 143 | |
| 144 void GraphKit::verify_exception_state(SafePointNode* ex_map) { | |
| 145 assert(ex_map->next_exception() == NULL, "not already part of a chain"); | |
| 146 assert(has_saved_ex_oop(ex_map), "every exception state has an ex_oop"); | |
| 147 } | |
| 148 #endif | |
| 149 | |
| 150 //---------------------------stop_and_kill_map--------------------------------- | |
| 151 // Set _map to NULL, signalling a stop to further bytecode execution. | |
| 152 // First smash the current map's control to a constant, to mark it dead. | |
| 153 void GraphKit::stop_and_kill_map() { | |
| 154 SafePointNode* dead_map = stop(); | |
| 155 if (dead_map != NULL) { | |
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156 dead_map->disconnect_inputs(NULL, C); // Mark the map as killed. |
| 0 | 157 assert(dead_map->is_killed(), "must be so marked"); |
| 158 } | |
| 159 } | |
| 160 | |
| 161 | |
| 162 //--------------------------------stopped-------------------------------------- | |
| 163 // Tell if _map is NULL, or control is top. | |
| 164 bool GraphKit::stopped() { | |
| 165 if (map() == NULL) return true; | |
| 166 else if (control() == top()) return true; | |
| 167 else return false; | |
| 168 } | |
| 169 | |
| 170 | |
| 171 //-----------------------------has_ex_handler---------------------------------- | |
| 172 // Tell if this method or any caller method has exception handlers. | |
| 173 bool GraphKit::has_ex_handler() { | |
| 174 for (JVMState* jvmsp = jvms(); jvmsp != NULL; jvmsp = jvmsp->caller()) { | |
| 175 if (jvmsp->has_method() && jvmsp->method()->has_exception_handlers()) { | |
| 176 return true; | |
| 177 } | |
| 178 } | |
| 179 return false; | |
| 180 } | |
| 181 | |
| 182 //------------------------------save_ex_oop------------------------------------ | |
| 183 // Save an exception without blowing stack contents or other JVM state. | |
| 184 void GraphKit::set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop) { | |
| 185 assert(!has_saved_ex_oop(ex_map), "clear ex-oop before setting again"); | |
| 186 ex_map->add_req(ex_oop); | |
| 187 debug_only(verify_exception_state(ex_map)); | |
| 188 } | |
| 189 | |
| 190 inline static Node* common_saved_ex_oop(SafePointNode* ex_map, bool clear_it) { | |
| 191 assert(GraphKit::has_saved_ex_oop(ex_map), "ex_oop must be there"); | |
| 192 Node* ex_oop = ex_map->in(ex_map->req()-1); | |
| 193 if (clear_it) ex_map->del_req(ex_map->req()-1); | |
| 194 return ex_oop; | |
| 195 } | |
| 196 | |
| 197 //-----------------------------saved_ex_oop------------------------------------ | |
| 198 // Recover a saved exception from its map. | |
| 199 Node* GraphKit::saved_ex_oop(SafePointNode* ex_map) { | |
| 200 return common_saved_ex_oop(ex_map, false); | |
| 201 } | |
| 202 | |
| 203 //--------------------------clear_saved_ex_oop--------------------------------- | |
| 204 // Erase a previously saved exception from its map. | |
| 205 Node* GraphKit::clear_saved_ex_oop(SafePointNode* ex_map) { | |
| 206 return common_saved_ex_oop(ex_map, true); | |
| 207 } | |
| 208 | |
| 209 #ifdef ASSERT | |
| 210 //---------------------------has_saved_ex_oop---------------------------------- | |
| 211 // Erase a previously saved exception from its map. | |
| 212 bool GraphKit::has_saved_ex_oop(SafePointNode* ex_map) { | |
| 213 return ex_map->req() == ex_map->jvms()->endoff()+1; | |
| 214 } | |
| 215 #endif | |
| 216 | |
| 217 //-------------------------make_exception_state-------------------------------- | |
| 218 // Turn the current JVM state into an exception state, appending the ex_oop. | |
| 219 SafePointNode* GraphKit::make_exception_state(Node* ex_oop) { | |
| 220 sync_jvms(); | |
| 221 SafePointNode* ex_map = stop(); // do not manipulate this map any more | |
| 222 set_saved_ex_oop(ex_map, ex_oop); | |
| 223 return ex_map; | |
| 224 } | |
| 225 | |
| 226 | |
| 227 //--------------------------add_exception_state-------------------------------- | |
| 228 // Add an exception to my list of exceptions. | |
| 229 void GraphKit::add_exception_state(SafePointNode* ex_map) { | |
| 230 if (ex_map == NULL || ex_map->control() == top()) { | |
| 231 return; | |
| 232 } | |
| 233 #ifdef ASSERT | |
| 234 verify_exception_state(ex_map); | |
| 235 if (has_exceptions()) { | |
| 236 assert(ex_map->jvms()->same_calls_as(_exceptions->jvms()), "all collected exceptions must come from the same place"); | |
| 237 } | |
| 238 #endif | |
| 239 | |
| 240 // If there is already an exception of exactly this type, merge with it. | |
| 241 // In particular, null-checks and other low-level exceptions common up here. | |
| 242 Node* ex_oop = saved_ex_oop(ex_map); | |
| 243 const Type* ex_type = _gvn.type(ex_oop); | |
| 244 if (ex_oop == top()) { | |
| 245 // No action needed. | |
| 246 return; | |
| 247 } | |
| 248 assert(ex_type->isa_instptr(), "exception must be an instance"); | |
| 249 for (SafePointNode* e2 = _exceptions; e2 != NULL; e2 = e2->next_exception()) { | |
| 250 const Type* ex_type2 = _gvn.type(saved_ex_oop(e2)); | |
| 251 // We check sp also because call bytecodes can generate exceptions | |
| 252 // both before and after arguments are popped! | |
| 253 if (ex_type2 == ex_type | |
| 254 && e2->_jvms->sp() == ex_map->_jvms->sp()) { | |
| 255 combine_exception_states(ex_map, e2); | |
| 256 return; | |
| 257 } | |
| 258 } | |
| 259 | |
| 260 // No pre-existing exception of the same type. Chain it on the list. | |
| 261 push_exception_state(ex_map); | |
| 262 } | |
| 263 | |
| 264 //-----------------------add_exception_states_from----------------------------- | |
| 265 void GraphKit::add_exception_states_from(JVMState* jvms) { | |
| 266 SafePointNode* ex_map = jvms->map()->next_exception(); | |
| 267 if (ex_map != NULL) { | |
| 268 jvms->map()->set_next_exception(NULL); | |
| 269 for (SafePointNode* next_map; ex_map != NULL; ex_map = next_map) { | |
| 270 next_map = ex_map->next_exception(); | |
| 271 ex_map->set_next_exception(NULL); | |
| 272 add_exception_state(ex_map); | |
| 273 } | |
| 274 } | |
| 275 } | |
| 276 | |
| 277 //-----------------------transfer_exceptions_into_jvms------------------------- | |
| 278 JVMState* GraphKit::transfer_exceptions_into_jvms() { | |
| 279 if (map() == NULL) { | |
| 280 // We need a JVMS to carry the exceptions, but the map has gone away. | |
| 281 // Create a scratch JVMS, cloned from any of the exception states... | |
| 282 if (has_exceptions()) { | |
| 283 _map = _exceptions; | |
| 284 _map = clone_map(); | |
| 285 _map->set_next_exception(NULL); | |
| 286 clear_saved_ex_oop(_map); | |
| 287 debug_only(verify_map()); | |
| 288 } else { | |
| 289 // ...or created from scratch | |
| 290 JVMState* jvms = new (C) JVMState(_method, NULL); | |
| 291 jvms->set_bci(_bci); | |
| 292 jvms->set_sp(_sp); | |
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293 jvms->set_map(new (C) SafePointNode(TypeFunc::Parms, jvms)); |
| 0 | 294 set_jvms(jvms); |
| 295 for (uint i = 0; i < map()->req(); i++) map()->init_req(i, top()); | |
| 296 set_all_memory(top()); | |
| 297 while (map()->req() < jvms->endoff()) map()->add_req(top()); | |
| 298 } | |
| 299 // (This is a kludge, in case you didn't notice.) | |
| 300 set_control(top()); | |
| 301 } | |
| 302 JVMState* jvms = sync_jvms(); | |
| 303 assert(!jvms->map()->has_exceptions(), "no exceptions on this map yet"); | |
| 304 jvms->map()->set_next_exception(_exceptions); | |
| 305 _exceptions = NULL; // done with this set of exceptions | |
| 306 return jvms; | |
| 307 } | |
| 308 | |
| 309 static inline void add_n_reqs(Node* dstphi, Node* srcphi) { | |
| 310 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
| 311 assert(is_hidden_merge(srcphi), "must be a special merge node"); | |
| 312 uint limit = srcphi->req(); | |
| 313 for (uint i = PhiNode::Input; i < limit; i++) { | |
| 314 dstphi->add_req(srcphi->in(i)); | |
| 315 } | |
| 316 } | |
| 317 static inline void add_one_req(Node* dstphi, Node* src) { | |
| 318 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
| 319 assert(!is_hidden_merge(src), "must not be a special merge node"); | |
| 320 dstphi->add_req(src); | |
| 321 } | |
| 322 | |
| 323 //-----------------------combine_exception_states------------------------------ | |
| 324 // This helper function combines exception states by building phis on a | |
| 325 // specially marked state-merging region. These regions and phis are | |
| 326 // untransformed, and can build up gradually. The region is marked by | |
| 327 // having a control input of its exception map, rather than NULL. Such | |
| 328 // regions do not appear except in this function, and in use_exception_state. | |
| 329 void GraphKit::combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map) { | |
| 330 if (failing()) return; // dying anyway... | |
| 331 JVMState* ex_jvms = ex_map->_jvms; | |
| 332 assert(ex_jvms->same_calls_as(phi_map->_jvms), "consistent call chains"); | |
| 333 assert(ex_jvms->stkoff() == phi_map->_jvms->stkoff(), "matching locals"); | |
| 334 assert(ex_jvms->sp() == phi_map->_jvms->sp(), "matching stack sizes"); | |
| 335 assert(ex_jvms->monoff() == phi_map->_jvms->monoff(), "matching JVMS"); | |
| 10278 | 336 assert(ex_jvms->scloff() == phi_map->_jvms->scloff(), "matching scalar replaced objects"); |
| 0 | 337 assert(ex_map->req() == phi_map->req(), "matching maps"); |
| 338 uint tos = ex_jvms->stkoff() + ex_jvms->sp(); | |
| 339 Node* hidden_merge_mark = root(); | |
| 340 Node* region = phi_map->control(); | |
| 341 MergeMemNode* phi_mem = phi_map->merged_memory(); | |
| 342 MergeMemNode* ex_mem = ex_map->merged_memory(); | |
| 343 if (region->in(0) != hidden_merge_mark) { | |
| 344 // The control input is not (yet) a specially-marked region in phi_map. | |
| 345 // Make it so, and build some phis. | |
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346 region = new (C) RegionNode(2); |
| 0 | 347 _gvn.set_type(region, Type::CONTROL); |
| 348 region->set_req(0, hidden_merge_mark); // marks an internal ex-state | |
| 349 region->init_req(1, phi_map->control()); | |
| 350 phi_map->set_control(region); | |
| 351 Node* io_phi = PhiNode::make(region, phi_map->i_o(), Type::ABIO); | |
| 352 record_for_igvn(io_phi); | |
| 353 _gvn.set_type(io_phi, Type::ABIO); | |
| 354 phi_map->set_i_o(io_phi); | |
| 355 for (MergeMemStream mms(phi_mem); mms.next_non_empty(); ) { | |
| 356 Node* m = mms.memory(); | |
| 357 Node* m_phi = PhiNode::make(region, m, Type::MEMORY, mms.adr_type(C)); | |
| 358 record_for_igvn(m_phi); | |
| 359 _gvn.set_type(m_phi, Type::MEMORY); | |
| 360 mms.set_memory(m_phi); | |
| 361 } | |
| 362 } | |
| 363 | |
| 364 // Either or both of phi_map and ex_map might already be converted into phis. | |
| 365 Node* ex_control = ex_map->control(); | |
| 366 // if there is special marking on ex_map also, we add multiple edges from src | |
| 367 bool add_multiple = (ex_control->in(0) == hidden_merge_mark); | |
| 368 // how wide was the destination phi_map, originally? | |
| 369 uint orig_width = region->req(); | |
| 370 | |
| 371 if (add_multiple) { | |
| 372 add_n_reqs(region, ex_control); | |
| 373 add_n_reqs(phi_map->i_o(), ex_map->i_o()); | |
| 374 } else { | |
| 375 // ex_map has no merges, so we just add single edges everywhere | |
| 376 add_one_req(region, ex_control); | |
| 377 add_one_req(phi_map->i_o(), ex_map->i_o()); | |
| 378 } | |
| 379 for (MergeMemStream mms(phi_mem, ex_mem); mms.next_non_empty2(); ) { | |
| 380 if (mms.is_empty()) { | |
| 381 // get a copy of the base memory, and patch some inputs into it | |
| 382 const TypePtr* adr_type = mms.adr_type(C); | |
| 383 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type); | |
| 384 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), ""); | |
| 385 mms.set_memory(phi); | |
| 386 // Prepare to append interesting stuff onto the newly sliced phi: | |
| 387 while (phi->req() > orig_width) phi->del_req(phi->req()-1); | |
| 388 } | |
| 389 // Append stuff from ex_map: | |
| 390 if (add_multiple) { | |
| 391 add_n_reqs(mms.memory(), mms.memory2()); | |
| 392 } else { | |
| 393 add_one_req(mms.memory(), mms.memory2()); | |
| 394 } | |
| 395 } | |
| 396 uint limit = ex_map->req(); | |
| 397 for (uint i = TypeFunc::Parms; i < limit; i++) { | |
| 398 // Skip everything in the JVMS after tos. (The ex_oop follows.) | |
| 399 if (i == tos) i = ex_jvms->monoff(); | |
| 400 Node* src = ex_map->in(i); | |
| 401 Node* dst = phi_map->in(i); | |
| 402 if (src != dst) { | |
| 403 PhiNode* phi; | |
| 404 if (dst->in(0) != region) { | |
| 405 dst = phi = PhiNode::make(region, dst, _gvn.type(dst)); | |
| 406 record_for_igvn(phi); | |
| 407 _gvn.set_type(phi, phi->type()); | |
| 408 phi_map->set_req(i, dst); | |
| 409 // Prepare to append interesting stuff onto the new phi: | |
| 410 while (dst->req() > orig_width) dst->del_req(dst->req()-1); | |
| 411 } else { | |
| 412 assert(dst->is_Phi(), "nobody else uses a hidden region"); | |
| 10278 | 413 phi = dst->as_Phi(); |
| 0 | 414 } |
| 415 if (add_multiple && src->in(0) == ex_control) { | |
| 416 // Both are phis. | |
| 417 add_n_reqs(dst, src); | |
| 418 } else { | |
| 419 while (dst->req() < region->req()) add_one_req(dst, src); | |
| 420 } | |
| 421 const Type* srctype = _gvn.type(src); | |
| 422 if (phi->type() != srctype) { | |
| 423 const Type* dsttype = phi->type()->meet(srctype); | |
| 424 if (phi->type() != dsttype) { | |
| 425 phi->set_type(dsttype); | |
| 426 _gvn.set_type(phi, dsttype); | |
| 427 } | |
| 428 } | |
| 429 } | |
| 430 } | |
| 431 } | |
| 432 | |
| 433 //--------------------------use_exception_state-------------------------------- | |
| 434 Node* GraphKit::use_exception_state(SafePointNode* phi_map) { | |
| 435 if (failing()) { stop(); return top(); } | |
| 436 Node* region = phi_map->control(); | |
| 437 Node* hidden_merge_mark = root(); | |
| 438 assert(phi_map->jvms()->map() == phi_map, "sanity: 1-1 relation"); | |
| 439 Node* ex_oop = clear_saved_ex_oop(phi_map); | |
| 440 if (region->in(0) == hidden_merge_mark) { | |
| 441 // Special marking for internal ex-states. Process the phis now. | |
| 442 region->set_req(0, region); // now it's an ordinary region | |
| 443 set_jvms(phi_map->jvms()); // ...so now we can use it as a map | |
| 444 // Note: Setting the jvms also sets the bci and sp. | |
| 445 set_control(_gvn.transform(region)); | |
| 446 uint tos = jvms()->stkoff() + sp(); | |
| 447 for (uint i = 1; i < tos; i++) { | |
| 448 Node* x = phi_map->in(i); | |
| 449 if (x->in(0) == region) { | |
| 450 assert(x->is_Phi(), "expected a special phi"); | |
| 451 phi_map->set_req(i, _gvn.transform(x)); | |
| 452 } | |
| 453 } | |
| 454 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) { | |
| 455 Node* x = mms.memory(); | |
| 456 if (x->in(0) == region) { | |
| 457 assert(x->is_Phi(), "nobody else uses a hidden region"); | |
| 458 mms.set_memory(_gvn.transform(x)); | |
| 459 } | |
| 460 } | |
| 461 if (ex_oop->in(0) == region) { | |
| 462 assert(ex_oop->is_Phi(), "expected a special phi"); | |
| 463 ex_oop = _gvn.transform(ex_oop); | |
| 464 } | |
| 465 } else { | |
| 466 set_jvms(phi_map->jvms()); | |
| 467 } | |
| 468 | |
| 469 assert(!is_hidden_merge(phi_map->control()), "hidden ex. states cleared"); | |
| 470 assert(!is_hidden_merge(phi_map->i_o()), "hidden ex. states cleared"); | |
| 471 return ex_oop; | |
| 472 } | |
| 473 | |
| 474 //---------------------------------java_bc------------------------------------- | |
| 475 Bytecodes::Code GraphKit::java_bc() const { | |
| 476 ciMethod* method = this->method(); | |
| 477 int bci = this->bci(); | |
| 478 if (method != NULL && bci != InvocationEntryBci) | |
| 479 return method->java_code_at_bci(bci); | |
| 480 else | |
| 481 return Bytecodes::_illegal; | |
| 482 } | |
| 483 | |
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484 void GraphKit::uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason, |
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485 bool must_throw) { |
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486 // if the exception capability is set, then we will generate code |
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487 // to check the JavaThread.should_post_on_exceptions flag to see |
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488 // if we actually need to report exception events (for this |
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489 // thread). If we don't need to report exception events, we will |
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490 // take the normal fast path provided by add_exception_events. If |
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491 // exception event reporting is enabled for this thread, we will |
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492 // take the uncommon_trap in the BuildCutout below. |
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493 |
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494 // first must access the should_post_on_exceptions_flag in this thread's JavaThread |
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495 Node* jthread = _gvn.transform(new (C) ThreadLocalNode()); |
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496 Node* adr = basic_plus_adr(top(), jthread, in_bytes(JavaThread::should_post_on_exceptions_flag_offset())); |
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497 Node* should_post_flag = make_load(control(), adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw, false); |
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498 |
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499 // Test the should_post_on_exceptions_flag vs. 0 |
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500 Node* chk = _gvn.transform( new (C) CmpINode(should_post_flag, intcon(0)) ); |
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501 Node* tst = _gvn.transform( new (C) BoolNode(chk, BoolTest::eq) ); |
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502 |
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503 // Branch to slow_path if should_post_on_exceptions_flag was true |
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504 { BuildCutout unless(this, tst, PROB_MAX); |
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505 // Do not try anything fancy if we're notifying the VM on every throw. |
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506 // Cf. case Bytecodes::_athrow in parse2.cpp. |
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507 uncommon_trap(reason, Deoptimization::Action_none, |
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508 (ciKlass*)NULL, (char*)NULL, must_throw); |
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509 } |
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510 |
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511 } |
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512 |
| 0 | 513 //------------------------------builtin_throw---------------------------------- |
| 514 void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) { | |
| 515 bool must_throw = true; | |
| 516 | |
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517 if (env()->jvmti_can_post_on_exceptions()) { |
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518 // check if we must post exception events, take uncommon trap if so |
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519 uncommon_trap_if_should_post_on_exceptions(reason, must_throw); |
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520 // here if should_post_on_exceptions is false |
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521 // continue on with the normal codegen |
| 0 | 522 } |
| 523 | |
| 524 // If this particular condition has not yet happened at this | |
| 525 // bytecode, then use the uncommon trap mechanism, and allow for | |
| 526 // a future recompilation if several traps occur here. | |
| 527 // If the throw is hot, try to use a more complicated inline mechanism | |
| 528 // which keeps execution inside the compiled code. | |
| 529 bool treat_throw_as_hot = false; | |
| 530 ciMethodData* md = method()->method_data(); | |
| 531 | |
| 532 if (ProfileTraps) { | |
| 533 if (too_many_traps(reason)) { | |
| 534 treat_throw_as_hot = true; | |
| 535 } | |
| 536 // (If there is no MDO at all, assume it is early in | |
| 537 // execution, and that any deopts are part of the | |
| 538 // startup transient, and don't need to be remembered.) | |
| 539 | |
| 540 // Also, if there is a local exception handler, treat all throws | |
| 541 // as hot if there has been at least one in this method. | |
| 542 if (C->trap_count(reason) != 0 | |
| 543 && method()->method_data()->trap_count(reason) != 0 | |
| 544 && has_ex_handler()) { | |
| 545 treat_throw_as_hot = true; | |
| 546 } | |
| 547 } | |
| 548 | |
| 549 // If this throw happens frequently, an uncommon trap might cause | |
| 550 // a performance pothole. If there is a local exception handler, | |
| 551 // and if this particular bytecode appears to be deoptimizing often, | |
| 552 // let us handle the throw inline, with a preconstructed instance. | |
| 553 // Note: If the deopt count has blown up, the uncommon trap | |
| 554 // runtime is going to flush this nmethod, not matter what. | |
| 555 if (treat_throw_as_hot | |
| 556 && (!StackTraceInThrowable || OmitStackTraceInFastThrow)) { | |
| 557 // If the throw is local, we use a pre-existing instance and | |
| 558 // punt on the backtrace. This would lead to a missing backtrace | |
| 559 // (a repeat of 4292742) if the backtrace object is ever asked | |
| 560 // for its backtrace. | |
| 561 // Fixing this remaining case of 4292742 requires some flavor of | |
| 562 // escape analysis. Leave that for the future. | |
| 563 ciInstance* ex_obj = NULL; | |
| 564 switch (reason) { | |
| 565 case Deoptimization::Reason_null_check: | |
| 566 ex_obj = env()->NullPointerException_instance(); | |
| 567 break; | |
| 568 case Deoptimization::Reason_div0_check: | |
| 569 ex_obj = env()->ArithmeticException_instance(); | |
| 570 break; | |
| 571 case Deoptimization::Reason_range_check: | |
| 572 ex_obj = env()->ArrayIndexOutOfBoundsException_instance(); | |
| 573 break; | |
| 574 case Deoptimization::Reason_class_check: | |
| 575 if (java_bc() == Bytecodes::_aastore) { | |
| 576 ex_obj = env()->ArrayStoreException_instance(); | |
| 577 } else { | |
| 578 ex_obj = env()->ClassCastException_instance(); | |
| 579 } | |
| 580 break; | |
| 581 } | |
| 582 if (failing()) { stop(); return; } // exception allocation might fail | |
| 583 if (ex_obj != NULL) { | |
| 584 // Cheat with a preallocated exception object. | |
| 585 if (C->log() != NULL) | |
| 586 C->log()->elem("hot_throw preallocated='1' reason='%s'", | |
| 587 Deoptimization::trap_reason_name(reason)); | |
| 588 const TypeInstPtr* ex_con = TypeInstPtr::make(ex_obj); | |
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589 Node* ex_node = _gvn.transform( ConNode::make(C, ex_con) ); |
| 0 | 590 |
| 591 // Clear the detail message of the preallocated exception object. | |
| 592 // Weblogic sometimes mutates the detail message of exceptions | |
| 593 // using reflection. | |
| 594 int offset = java_lang_Throwable::get_detailMessage_offset(); | |
| 595 const TypePtr* adr_typ = ex_con->add_offset(offset); | |
| 596 | |
| 597 Node *adr = basic_plus_adr(ex_node, ex_node, offset); | |
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598 const TypeOopPtr* val_type = TypeOopPtr::make_from_klass(env()->String_klass()); |
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599 Node *store = store_oop_to_object(control(), ex_node, adr, adr_typ, null(), val_type, T_OBJECT); |
| 0 | 600 |
| 601 add_exception_state(make_exception_state(ex_node)); | |
| 602 return; | |
| 603 } | |
| 604 } | |
| 605 | |
| 606 // %%% Maybe add entry to OptoRuntime which directly throws the exc.? | |
| 607 // It won't be much cheaper than bailing to the interp., since we'll | |
| 608 // have to pass up all the debug-info, and the runtime will have to | |
| 609 // create the stack trace. | |
| 610 | |
| 611 // Usual case: Bail to interpreter. | |
| 612 // Reserve the right to recompile if we haven't seen anything yet. | |
| 613 | |
| 614 Deoptimization::DeoptAction action = Deoptimization::Action_maybe_recompile; | |
| 615 if (treat_throw_as_hot | |
| 616 && (method()->method_data()->trap_recompiled_at(bci()) | |
| 617 || C->too_many_traps(reason))) { | |
| 618 // We cannot afford to take more traps here. Suffer in the interpreter. | |
| 619 if (C->log() != NULL) | |
| 620 C->log()->elem("hot_throw preallocated='0' reason='%s' mcount='%d'", | |
| 621 Deoptimization::trap_reason_name(reason), | |
| 622 C->trap_count(reason)); | |
| 623 action = Deoptimization::Action_none; | |
| 624 } | |
| 625 | |
| 626 // "must_throw" prunes the JVM state to include only the stack, if there | |
| 627 // are no local exception handlers. This should cut down on register | |
| 628 // allocation time and code size, by drastically reducing the number | |
| 629 // of in-edges on the call to the uncommon trap. | |
| 630 | |
| 631 uncommon_trap(reason, action, (ciKlass*)NULL, (char*)NULL, must_throw); | |
| 632 } | |
| 633 | |
| 634 | |
| 635 //----------------------------PreserveJVMState--------------------------------- | |
| 636 PreserveJVMState::PreserveJVMState(GraphKit* kit, bool clone_map) { | |
| 637 debug_only(kit->verify_map()); | |
| 638 _kit = kit; | |
| 639 _map = kit->map(); // preserve the map | |
| 640 _sp = kit->sp(); | |
| 641 kit->set_map(clone_map ? kit->clone_map() : NULL); | |
| 642 #ifdef ASSERT | |
| 643 _bci = kit->bci(); | |
| 644 Parse* parser = kit->is_Parse(); | |
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645 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
| 0 | 646 _block = block; |
| 647 #endif | |
| 648 } | |
| 649 PreserveJVMState::~PreserveJVMState() { | |
| 650 GraphKit* kit = _kit; | |
| 651 #ifdef ASSERT | |
| 652 assert(kit->bci() == _bci, "bci must not shift"); | |
| 653 Parse* parser = kit->is_Parse(); | |
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654 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
| 0 | 655 assert(block == _block, "block must not shift"); |
| 656 #endif | |
| 657 kit->set_map(_map); | |
| 658 kit->set_sp(_sp); | |
| 659 } | |
| 660 | |
| 661 | |
| 662 //-----------------------------BuildCutout------------------------------------- | |
| 663 BuildCutout::BuildCutout(GraphKit* kit, Node* p, float prob, float cnt) | |
| 664 : PreserveJVMState(kit) | |
| 665 { | |
| 666 assert(p->is_Con() || p->is_Bool(), "test must be a bool"); | |
| 667 SafePointNode* outer_map = _map; // preserved map is caller's | |
| 668 SafePointNode* inner_map = kit->map(); | |
| 669 IfNode* iff = kit->create_and_map_if(outer_map->control(), p, prob, cnt); | |
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670 outer_map->set_control(kit->gvn().transform( new (kit->C) IfTrueNode(iff) )); |
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671 inner_map->set_control(kit->gvn().transform( new (kit->C) IfFalseNode(iff) )); |
| 0 | 672 } |
| 673 BuildCutout::~BuildCutout() { | |
| 674 GraphKit* kit = _kit; | |
| 675 assert(kit->stopped(), "cutout code must stop, throw, return, etc."); | |
| 676 } | |
| 677 | |
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678 //---------------------------PreserveReexecuteState---------------------------- |
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679 PreserveReexecuteState::PreserveReexecuteState(GraphKit* kit) { |
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680 assert(!kit->stopped(), "must call stopped() before"); |
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681 _kit = kit; |
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682 _sp = kit->sp(); |
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683 _reexecute = kit->jvms()->_reexecute; |
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684 } |
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685 PreserveReexecuteState::~PreserveReexecuteState() { |
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686 if (_kit->stopped()) return; |
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687 _kit->jvms()->_reexecute = _reexecute; |
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688 _kit->set_sp(_sp); |
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689 } |
| 0 | 690 |
| 691 //------------------------------clone_map-------------------------------------- | |
| 692 // Implementation of PreserveJVMState | |
| 693 // | |
| 694 // Only clone_map(...) here. If this function is only used in the | |
| 695 // PreserveJVMState class we may want to get rid of this extra | |
| 696 // function eventually and do it all there. | |
| 697 | |
| 698 SafePointNode* GraphKit::clone_map() { | |
| 699 if (map() == NULL) return NULL; | |
| 700 | |
| 701 // Clone the memory edge first | |
| 702 Node* mem = MergeMemNode::make(C, map()->memory()); | |
| 703 gvn().set_type_bottom(mem); | |
| 704 | |
| 705 SafePointNode *clonemap = (SafePointNode*)map()->clone(); | |
| 706 JVMState* jvms = this->jvms(); | |
| 707 JVMState* clonejvms = jvms->clone_shallow(C); | |
| 708 clonemap->set_memory(mem); | |
| 709 clonemap->set_jvms(clonejvms); | |
| 710 clonejvms->set_map(clonemap); | |
| 711 record_for_igvn(clonemap); | |
| 712 gvn().set_type_bottom(clonemap); | |
| 713 return clonemap; | |
| 714 } | |
| 715 | |
| 716 | |
| 717 //-----------------------------set_map_clone----------------------------------- | |
| 718 void GraphKit::set_map_clone(SafePointNode* m) { | |
| 719 _map = m; | |
| 720 _map = clone_map(); | |
| 721 _map->set_next_exception(NULL); | |
| 722 debug_only(verify_map()); | |
| 723 } | |
| 724 | |
| 725 | |
| 726 //----------------------------kill_dead_locals--------------------------------- | |
| 727 // Detect any locals which are known to be dead, and force them to top. | |
| 728 void GraphKit::kill_dead_locals() { | |
| 729 // Consult the liveness information for the locals. If any | |
| 730 // of them are unused, then they can be replaced by top(). This | |
| 731 // should help register allocation time and cut down on the size | |
| 732 // of the deoptimization information. | |
| 733 | |
| 734 // This call is made from many of the bytecode handling | |
| 735 // subroutines called from the Big Switch in do_one_bytecode. | |
| 736 // Every bytecode which might include a slow path is responsible | |
| 737 // for killing its dead locals. The more consistent we | |
| 738 // are about killing deads, the fewer useless phis will be | |
| 739 // constructed for them at various merge points. | |
| 740 | |
| 741 // bci can be -1 (InvocationEntryBci). We return the entry | |
| 742 // liveness for the method. | |
| 743 | |
| 744 if (method() == NULL || method()->code_size() == 0) { | |
| 745 // We are building a graph for a call to a native method. | |
| 746 // All locals are live. | |
| 747 return; | |
| 748 } | |
| 749 | |
| 750 ResourceMark rm; | |
| 751 | |
| 752 // Consult the liveness information for the locals. If any | |
| 753 // of them are unused, then they can be replaced by top(). This | |
| 754 // should help register allocation time and cut down on the size | |
| 755 // of the deoptimization information. | |
| 756 MethodLivenessResult live_locals = method()->liveness_at_bci(bci()); | |
| 757 | |
| 758 int len = (int)live_locals.size(); | |
| 759 assert(len <= jvms()->loc_size(), "too many live locals"); | |
| 760 for (int local = 0; local < len; local++) { | |
| 761 if (!live_locals.at(local)) { | |
| 762 set_local(local, top()); | |
| 763 } | |
| 764 } | |
| 765 } | |
| 766 | |
| 767 #ifdef ASSERT | |
| 768 //-------------------------dead_locals_are_killed------------------------------ | |
| 769 // Return true if all dead locals are set to top in the map. | |
| 770 // Used to assert "clean" debug info at various points. | |
| 771 bool GraphKit::dead_locals_are_killed() { | |
| 772 if (method() == NULL || method()->code_size() == 0) { | |
| 773 // No locals need to be dead, so all is as it should be. | |
| 774 return true; | |
| 775 } | |
| 776 | |
| 777 // Make sure somebody called kill_dead_locals upstream. | |
| 778 ResourceMark rm; | |
| 779 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
| 780 if (jvms->loc_size() == 0) continue; // no locals to consult | |
| 781 SafePointNode* map = jvms->map(); | |
| 782 ciMethod* method = jvms->method(); | |
| 783 int bci = jvms->bci(); | |
| 784 if (jvms == this->jvms()) { | |
| 785 bci = this->bci(); // it might not yet be synched | |
| 786 } | |
| 787 MethodLivenessResult live_locals = method->liveness_at_bci(bci); | |
| 788 int len = (int)live_locals.size(); | |
| 789 if (!live_locals.is_valid() || len == 0) | |
| 790 // This method is trivial, or is poisoned by a breakpoint. | |
| 791 return true; | |
| 792 assert(len == jvms->loc_size(), "live map consistent with locals map"); | |
| 793 for (int local = 0; local < len; local++) { | |
| 794 if (!live_locals.at(local) && map->local(jvms, local) != top()) { | |
| 795 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 796 tty->print_cr("Zombie local %d: ", local); | |
| 797 jvms->dump(); | |
| 798 } | |
| 799 return false; | |
| 800 } | |
| 801 } | |
| 802 } | |
| 803 return true; | |
| 804 } | |
| 805 | |
| 806 #endif //ASSERT | |
| 807 | |
|
900
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808 // Helper function for enforcing certain bytecodes to reexecute if |
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809 // deoptimization happens |
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810 static bool should_reexecute_implied_by_bytecode(JVMState *jvms, bool is_anewarray) { |
|
900
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811 ciMethod* cur_method = jvms->method(); |
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812 int cur_bci = jvms->bci(); |
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813 if (cur_method != NULL && cur_bci != InvocationEntryBci) { |
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814 Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci); |
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815 return Interpreter::bytecode_should_reexecute(code) || |
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816 is_anewarray && code == Bytecodes::_multianewarray; |
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817 // Reexecute _multianewarray bytecode which was replaced with |
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818 // sequence of [a]newarray. See Parse::do_multianewarray(). |
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819 // |
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820 // Note: interpreter should not have it set since this optimization |
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821 // is limited by dimensions and guarded by flag so in some cases |
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822 // multianewarray() runtime calls will be generated and |
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823 // the bytecode should not be reexecutes (stack will not be reset). |
|
900
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824 } else |
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825 return false; |
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826 } |
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827 |
| 0 | 828 // Helper function for adding JVMState and debug information to node |
| 829 void GraphKit::add_safepoint_edges(SafePointNode* call, bool must_throw) { | |
| 830 // Add the safepoint edges to the call (or other safepoint). | |
| 831 | |
| 832 // Make sure dead locals are set to top. This | |
| 833 // should help register allocation time and cut down on the size | |
| 834 // of the deoptimization information. | |
| 835 assert(dead_locals_are_killed(), "garbage in debug info before safepoint"); | |
| 836 | |
| 837 // Walk the inline list to fill in the correct set of JVMState's | |
| 838 // Also fill in the associated edges for each JVMState. | |
| 839 | |
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840 // If the bytecode needs to be reexecuted we need to put |
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841 // the arguments back on the stack. |
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842 const bool should_reexecute = jvms()->should_reexecute(); |
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843 JVMState* youngest_jvms = should_reexecute ? sync_jvms_for_reexecute() : sync_jvms(); |
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844 |
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845 // NOTE: set_bci (called from sync_jvms) might reset the reexecute bit to |
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846 // undefined if the bci is different. This is normal for Parse but it |
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847 // should not happen for LibraryCallKit because only one bci is processed. |
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848 assert(!is_LibraryCallKit() || (jvms()->should_reexecute() == should_reexecute), |
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849 "in LibraryCallKit the reexecute bit should not change"); |
| 0 | 850 |
| 851 // If we are guaranteed to throw, we can prune everything but the | |
| 852 // input to the current bytecode. | |
| 853 bool can_prune_locals = false; | |
| 854 uint stack_slots_not_pruned = 0; | |
| 855 int inputs = 0, depth = 0; | |
| 856 if (must_throw) { | |
| 857 assert(method() == youngest_jvms->method(), "sanity"); | |
| 858 if (compute_stack_effects(inputs, depth)) { | |
| 859 can_prune_locals = true; | |
| 860 stack_slots_not_pruned = inputs; | |
| 861 } | |
| 862 } | |
| 863 | |
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864 if (env()->jvmti_can_access_local_variables()) { |
| 0 | 865 // At any safepoint, this method can get breakpointed, which would |
| 866 // then require an immediate deoptimization. | |
| 867 can_prune_locals = false; // do not prune locals | |
| 868 stack_slots_not_pruned = 0; | |
| 869 } | |
| 870 | |
| 871 // do not scribble on the input jvms | |
| 872 JVMState* out_jvms = youngest_jvms->clone_deep(C); | |
| 873 call->set_jvms(out_jvms); // Start jvms list for call node | |
| 874 | |
|
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875 // For a known set of bytecodes, the interpreter should reexecute them if |
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876 // deoptimization happens. We set the reexecute state for them here |
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877 if (out_jvms->is_reexecute_undefined() && //don't change if already specified |
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878 should_reexecute_implied_by_bytecode(out_jvms, call->is_AllocateArray())) { |
|
900
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879 out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed |
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880 } |
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881 |
| 0 | 882 // Presize the call: |
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883 DEBUG_ONLY(uint non_debug_edges = call->req()); |
| 0 | 884 call->add_req_batch(top(), youngest_jvms->debug_depth()); |
| 885 assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), ""); | |
| 886 | |
| 887 // Set up edges so that the call looks like this: | |
| 888 // Call [state:] ctl io mem fptr retadr | |
| 889 // [parms:] parm0 ... parmN | |
| 890 // [root:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
| 891 // [...mid:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...] | |
| 892 // [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
| 893 // Note that caller debug info precedes callee debug info. | |
| 894 | |
| 895 // Fill pointer walks backwards from "young:" to "root:" in the diagram above: | |
| 896 uint debug_ptr = call->req(); | |
| 897 | |
| 898 // Loop over the map input edges associated with jvms, add them | |
| 899 // to the call node, & reset all offsets to match call node array. | |
| 900 for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) { | |
| 901 uint debug_end = debug_ptr; | |
| 902 uint debug_start = debug_ptr - in_jvms->debug_size(); | |
| 903 debug_ptr = debug_start; // back up the ptr | |
| 904 | |
| 905 uint p = debug_start; // walks forward in [debug_start, debug_end) | |
| 906 uint j, k, l; | |
| 907 SafePointNode* in_map = in_jvms->map(); | |
| 908 out_jvms->set_map(call); | |
| 909 | |
| 910 if (can_prune_locals) { | |
| 911 assert(in_jvms->method() == out_jvms->method(), "sanity"); | |
| 912 // If the current throw can reach an exception handler in this JVMS, | |
| 913 // then we must keep everything live that can reach that handler. | |
| 914 // As a quick and dirty approximation, we look for any handlers at all. | |
| 915 if (in_jvms->method()->has_exception_handlers()) { | |
| 916 can_prune_locals = false; | |
| 917 } | |
| 918 } | |
| 919 | |
| 920 // Add the Locals | |
| 921 k = in_jvms->locoff(); | |
| 922 l = in_jvms->loc_size(); | |
| 923 out_jvms->set_locoff(p); | |
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924 if (!can_prune_locals) { |
| 0 | 925 for (j = 0; 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 Expression Stack | |
| 932 k = in_jvms->stkoff(); | |
| 933 l = in_jvms->sp(); | |
| 934 out_jvms->set_stkoff(p); | |
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935 if (!can_prune_locals) { |
| 0 | 936 for (j = 0; j < l; j++) |
| 937 call->set_req(p++, in_map->in(k+j)); | |
| 938 } else if (can_prune_locals && stack_slots_not_pruned != 0) { | |
| 939 // Divide stack into {S0,...,S1}, where S0 is set to top. | |
| 940 uint s1 = stack_slots_not_pruned; | |
| 941 stack_slots_not_pruned = 0; // for next iteration | |
| 942 if (s1 > l) s1 = l; | |
| 943 uint s0 = l - s1; | |
| 944 p += s0; // skip the tops preinstalled by add_req_batch | |
| 945 for (j = s0; j < l; j++) | |
| 946 call->set_req(p++, in_map->in(k+j)); | |
| 947 } else { | |
| 948 p += l; // already set to top above by add_req_batch | |
| 949 } | |
| 950 | |
| 951 // Add the Monitors | |
| 952 k = in_jvms->monoff(); | |
| 953 l = in_jvms->mon_size(); | |
| 954 out_jvms->set_monoff(p); | |
| 955 for (j = 0; j < l; j++) | |
| 956 call->set_req(p++, in_map->in(k+j)); | |
| 957 | |
|
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958 // Copy any scalar object fields. |
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959 k = in_jvms->scloff(); |
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960 l = in_jvms->scl_size(); |
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961 out_jvms->set_scloff(p); |
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962 for (j = 0; j < l; j++) |
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963 call->set_req(p++, in_map->in(k+j)); |
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964 |
| 0 | 965 // Finish the new jvms. |
| 966 out_jvms->set_endoff(p); | |
| 967 | |
| 968 assert(out_jvms->endoff() == debug_end, "fill ptr must match"); | |
| 969 assert(out_jvms->depth() == in_jvms->depth(), "depth must match"); | |
| 970 assert(out_jvms->loc_size() == in_jvms->loc_size(), "size must match"); | |
| 971 assert(out_jvms->mon_size() == in_jvms->mon_size(), "size must match"); | |
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972 assert(out_jvms->scl_size() == in_jvms->scl_size(), "size must match"); |
| 0 | 973 assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match"); |
| 974 | |
| 975 // Update the two tail pointers in parallel. | |
| 976 out_jvms = out_jvms->caller(); | |
| 977 in_jvms = in_jvms->caller(); | |
| 978 } | |
| 979 | |
| 980 assert(debug_ptr == non_debug_edges, "debug info must fit exactly"); | |
| 981 | |
| 982 // Test the correctness of JVMState::debug_xxx accessors: | |
| 983 assert(call->jvms()->debug_start() == non_debug_edges, ""); | |
| 984 assert(call->jvms()->debug_end() == call->req(), ""); | |
| 985 assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, ""); | |
| 986 } | |
| 987 | |
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988 bool GraphKit::compute_stack_effects(int& inputs, int& depth) { |
| 0 | 989 Bytecodes::Code code = java_bc(); |
| 990 if (code == Bytecodes::_wide) { | |
| 991 code = method()->java_code_at_bci(bci() + 1); | |
| 992 } | |
| 993 | |
| 994 BasicType rtype = T_ILLEGAL; | |
| 995 int rsize = 0; | |
| 996 | |
| 997 if (code != Bytecodes::_illegal) { | |
| 998 depth = Bytecodes::depth(code); // checkcast=0, athrow=-1 | |
| 999 rtype = Bytecodes::result_type(code); // checkcast=P, athrow=V | |
| 1000 if (rtype < T_CONFLICT) | |
| 1001 rsize = type2size[rtype]; | |
| 1002 } | |
| 1003 | |
| 1004 switch (code) { | |
| 1005 case Bytecodes::_illegal: | |
| 1006 return false; | |
| 1007 | |
| 1008 case Bytecodes::_ldc: | |
| 1009 case Bytecodes::_ldc_w: | |
| 1010 case Bytecodes::_ldc2_w: | |
| 1011 inputs = 0; | |
| 1012 break; | |
| 1013 | |
| 1014 case Bytecodes::_dup: inputs = 1; break; | |
| 1015 case Bytecodes::_dup_x1: inputs = 2; break; | |
| 1016 case Bytecodes::_dup_x2: inputs = 3; break; | |
| 1017 case Bytecodes::_dup2: inputs = 2; break; | |
| 1018 case Bytecodes::_dup2_x1: inputs = 3; break; | |
| 1019 case Bytecodes::_dup2_x2: inputs = 4; break; | |
| 1020 case Bytecodes::_swap: inputs = 2; break; | |
| 1021 case Bytecodes::_arraylength: inputs = 1; break; | |
| 1022 | |
| 1023 case Bytecodes::_getstatic: | |
| 1024 case Bytecodes::_putstatic: | |
| 1025 case Bytecodes::_getfield: | |
| 1026 case Bytecodes::_putfield: | |
| 1027 { | |
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1028 bool ignored_will_link; |
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1029 ciField* field = method()->get_field_at_bci(bci(), ignored_will_link); |
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1030 int size = field->type()->size(); |
| 0 | 1031 bool is_get = (depth >= 0), is_static = (depth & 1); |
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1032 inputs = (is_static ? 0 : 1); |
| 0 | 1033 if (is_get) { |
| 1034 depth = size - inputs; | |
| 1035 } else { | |
| 1036 inputs += size; // putxxx pops the value from the stack | |
| 1037 depth = - inputs; | |
| 1038 } | |
| 1039 } | |
| 1040 break; | |
| 1041 | |
| 1042 case Bytecodes::_invokevirtual: | |
| 1043 case Bytecodes::_invokespecial: | |
| 1044 case Bytecodes::_invokestatic: | |
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1045 case Bytecodes::_invokedynamic: |
| 0 | 1046 case Bytecodes::_invokeinterface: |
| 1047 { | |
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1048 bool ignored_will_link; |
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1049 ciSignature* declared_signature = NULL; |
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1050 ciMethod* ignored_callee = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature); |
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1051 assert(declared_signature != NULL, "cannot be null"); |
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1052 inputs = declared_signature->arg_size_for_bc(code); |
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1053 int size = declared_signature->return_type()->size(); |
| 0 | 1054 depth = size - inputs; |
| 1055 } | |
| 1056 break; | |
| 1057 | |
| 1058 case Bytecodes::_multianewarray: | |
| 1059 { | |
| 1060 ciBytecodeStream iter(method()); | |
| 1061 iter.reset_to_bci(bci()); | |
| 1062 iter.next(); | |
| 1063 inputs = iter.get_dimensions(); | |
| 1064 assert(rsize == 1, ""); | |
| 1065 depth = rsize - inputs; | |
| 1066 } | |
| 1067 break; | |
| 1068 | |
| 1069 case Bytecodes::_ireturn: | |
| 1070 case Bytecodes::_lreturn: | |
| 1071 case Bytecodes::_freturn: | |
| 1072 case Bytecodes::_dreturn: | |
| 1073 case Bytecodes::_areturn: | |
| 1074 assert(rsize = -depth, ""); | |
| 1075 inputs = rsize; | |
| 1076 break; | |
| 1077 | |
| 1078 case Bytecodes::_jsr: | |
| 1079 case Bytecodes::_jsr_w: | |
| 1080 inputs = 0; | |
| 1081 depth = 1; // S.B. depth=1, not zero | |
| 1082 break; | |
| 1083 | |
| 1084 default: | |
| 1085 // bytecode produces a typed result | |
| 1086 inputs = rsize - depth; | |
| 1087 assert(inputs >= 0, ""); | |
| 1088 break; | |
| 1089 } | |
| 1090 | |
| 1091 #ifdef ASSERT | |
| 1092 // spot check | |
| 1093 int outputs = depth + inputs; | |
| 1094 assert(outputs >= 0, "sanity"); | |
| 1095 switch (code) { | |
| 1096 case Bytecodes::_checkcast: assert(inputs == 1 && outputs == 1, ""); break; | |
| 1097 case Bytecodes::_athrow: assert(inputs == 1 && outputs == 0, ""); break; | |
| 1098 case Bytecodes::_aload_0: assert(inputs == 0 && outputs == 1, ""); break; | |
| 1099 case Bytecodes::_return: assert(inputs == 0 && outputs == 0, ""); break; | |
| 1100 case Bytecodes::_drem: assert(inputs == 4 && outputs == 2, ""); break; | |
| 1101 } | |
| 1102 #endif //ASSERT | |
| 1103 | |
| 1104 return true; | |
| 1105 } | |
| 1106 | |
| 1107 | |
| 1108 | |
| 1109 //------------------------------basic_plus_adr--------------------------------- | |
| 1110 Node* GraphKit::basic_plus_adr(Node* base, Node* ptr, Node* offset) { | |
| 1111 // short-circuit a common case | |
| 1112 if (offset == intcon(0)) return ptr; | |
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1113 return _gvn.transform( new (C) AddPNode(base, ptr, offset) ); |
| 0 | 1114 } |
| 1115 | |
| 1116 Node* GraphKit::ConvI2L(Node* offset) { | |
| 1117 // short-circuit a common case | |
| 1118 jint offset_con = find_int_con(offset, Type::OffsetBot); | |
| 1119 if (offset_con != Type::OffsetBot) { | |
| 6846 | 1120 return longcon((jlong) offset_con); |
| 0 | 1121 } |
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1122 return _gvn.transform( new (C) ConvI2LNode(offset)); |
| 0 | 1123 } |
| 1124 Node* GraphKit::ConvL2I(Node* offset) { | |
| 1125 // short-circuit a common case | |
| 1126 jlong offset_con = find_long_con(offset, (jlong)Type::OffsetBot); | |
| 1127 if (offset_con != (jlong)Type::OffsetBot) { | |
| 1128 return intcon((int) offset_con); | |
| 1129 } | |
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1130 return _gvn.transform( new (C) ConvL2INode(offset)); |
| 0 | 1131 } |
| 1132 | |
| 1133 //-------------------------load_object_klass----------------------------------- | |
| 1134 Node* GraphKit::load_object_klass(Node* obj) { | |
| 1135 // Special-case a fresh allocation to avoid building nodes: | |
| 1136 Node* akls = AllocateNode::Ideal_klass(obj, &_gvn); | |
| 1137 if (akls != NULL) return akls; | |
| 1138 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); | |
|
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1139 return _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), k_adr, TypeInstPtr::KLASS) ); |
| 0 | 1140 } |
| 1141 | |
| 1142 //-------------------------load_array_length----------------------------------- | |
| 1143 Node* GraphKit::load_array_length(Node* array) { | |
| 1144 // Special-case a fresh allocation to avoid building nodes: | |
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1145 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(array, &_gvn); |
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1146 Node *alen; |
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1147 if (alloc == NULL) { |
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1148 Node *r_adr = basic_plus_adr(array, arrayOopDesc::length_offset_in_bytes()); |
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1149 alen = _gvn.transform( new (C) LoadRangeNode(0, immutable_memory(), r_adr, TypeInt::POS)); |
|
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1150 } else { |
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1151 alen = alloc->Ideal_length(); |
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1152 Node* ccast = alloc->make_ideal_length(_gvn.type(array)->is_oopptr(), &_gvn); |
|
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1153 if (ccast != alen) { |
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1154 alen = _gvn.transform(ccast); |
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1155 } |
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1156 } |
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1157 return alen; |
| 0 | 1158 } |
| 1159 | |
| 1160 //------------------------------do_null_check---------------------------------- | |
| 1161 // Helper function to do a NULL pointer check. Returned value is | |
| 1162 // the incoming address with NULL casted away. You are allowed to use the | |
| 1163 // not-null value only if you are control dependent on the test. | |
| 1164 extern int explicit_null_checks_inserted, | |
| 1165 explicit_null_checks_elided; | |
| 1166 Node* GraphKit::null_check_common(Node* value, BasicType type, | |
| 1167 // optional arguments for variations: | |
| 1168 bool assert_null, | |
| 1169 Node* *null_control) { | |
| 1170 assert(!assert_null || null_control == NULL, "not both at once"); | |
| 1171 if (stopped()) return top(); | |
| 1172 if (!GenerateCompilerNullChecks && !assert_null && null_control == NULL) { | |
| 1173 // For some performance testing, we may wish to suppress null checking. | |
| 1174 value = cast_not_null(value); // Make it appear to be non-null (4962416). | |
| 1175 return value; | |
| 1176 } | |
| 1177 explicit_null_checks_inserted++; | |
| 1178 | |
| 1179 // Construct NULL check | |
| 1180 Node *chk = NULL; | |
| 1181 switch(type) { | |
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1182 case T_LONG : chk = new (C) CmpLNode(value, _gvn.zerocon(T_LONG)); break; |
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1183 case T_INT : chk = new (C) CmpINode(value, _gvn.intcon(0)); break; |
| 0 | 1184 case T_ARRAY : // fall through |
| 1185 type = T_OBJECT; // simplify further tests | |
| 1186 case T_OBJECT : { | |
| 1187 const Type *t = _gvn.type( value ); | |
| 1188 | |
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1189 const TypeOopPtr* tp = t->isa_oopptr(); |
| 955 | 1190 if (tp != NULL && tp->klass() != NULL && !tp->klass()->is_loaded() |
| 0 | 1191 // Only for do_null_check, not any of its siblings: |
| 1192 && !assert_null && null_control == NULL) { | |
| 1193 // Usually, any field access or invocation on an unloaded oop type | |
| 1194 // will simply fail to link, since the statically linked class is | |
| 1195 // likely also to be unloaded. However, in -Xcomp mode, sometimes | |
| 1196 // the static class is loaded but the sharper oop type is not. | |
| 1197 // Rather than checking for this obscure case in lots of places, | |
| 1198 // we simply observe that a null check on an unloaded class | |
| 1199 // will always be followed by a nonsense operation, so we | |
| 1200 // can just issue the uncommon trap here. | |
| 1201 // Our access to the unloaded class will only be correct | |
| 1202 // after it has been loaded and initialized, which requires | |
| 1203 // a trip through the interpreter. | |
| 1204 #ifndef PRODUCT | |
| 1205 if (WizardMode) { tty->print("Null check of unloaded "); tp->klass()->print(); tty->cr(); } | |
| 1206 #endif | |
| 1207 uncommon_trap(Deoptimization::Reason_unloaded, | |
| 1208 Deoptimization::Action_reinterpret, | |
| 1209 tp->klass(), "!loaded"); | |
| 1210 return top(); | |
| 1211 } | |
| 1212 | |
| 1213 if (assert_null) { | |
| 1214 // See if the type is contained in NULL_PTR. | |
| 1215 // If so, then the value is already null. | |
| 1216 if (t->higher_equal(TypePtr::NULL_PTR)) { | |
| 1217 explicit_null_checks_elided++; | |
| 1218 return value; // Elided null assert quickly! | |
| 1219 } | |
| 1220 } else { | |
| 1221 // See if mixing in the NULL pointer changes type. | |
| 1222 // If so, then the NULL pointer was not allowed in the original | |
| 1223 // type. In other words, "value" was not-null. | |
| 1224 if (t->meet(TypePtr::NULL_PTR) != t) { | |
| 1225 // same as: if (!TypePtr::NULL_PTR->higher_equal(t)) ... | |
| 1226 explicit_null_checks_elided++; | |
| 1227 return value; // Elided null check quickly! | |
| 1228 } | |
| 1229 } | |
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1230 chk = new (C) CmpPNode( value, null() ); |
| 0 | 1231 break; |
| 1232 } | |
| 1233 | |
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1234 default: |
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1235 fatal(err_msg_res("unexpected type: %s", type2name(type))); |
| 0 | 1236 } |
| 1237 assert(chk != NULL, "sanity check"); | |
| 1238 chk = _gvn.transform(chk); | |
| 1239 | |
| 1240 BoolTest::mask btest = assert_null ? BoolTest::eq : BoolTest::ne; | |
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1241 BoolNode *btst = new (C) BoolNode( chk, btest); |
| 0 | 1242 Node *tst = _gvn.transform( btst ); |
| 1243 | |
| 1244 //----------- | |
| 605 | 1245 // if peephole optimizations occurred, a prior test existed. |
| 0 | 1246 // If a prior test existed, maybe it dominates as we can avoid this test. |
| 1247 if (tst != btst && type == T_OBJECT) { | |
| 1248 // At this point we want to scan up the CFG to see if we can | |
| 1249 // find an identical test (and so avoid this test altogether). | |
| 1250 Node *cfg = control(); | |
| 1251 int depth = 0; | |
| 1252 while( depth < 16 ) { // Limit search depth for speed | |
| 1253 if( cfg->Opcode() == Op_IfTrue && | |
| 1254 cfg->in(0)->in(1) == tst ) { | |
| 1255 // Found prior test. Use "cast_not_null" to construct an identical | |
| 1256 // CastPP (and hence hash to) as already exists for the prior test. | |
| 1257 // Return that casted value. | |
| 1258 if (assert_null) { | |
| 1259 replace_in_map(value, null()); | |
| 1260 return null(); // do not issue the redundant test | |
| 1261 } | |
| 1262 Node *oldcontrol = control(); | |
| 1263 set_control(cfg); | |
| 1264 Node *res = cast_not_null(value); | |
| 1265 set_control(oldcontrol); | |
| 1266 explicit_null_checks_elided++; | |
| 1267 return res; | |
| 1268 } | |
| 1269 cfg = IfNode::up_one_dom(cfg, /*linear_only=*/ true); | |
| 1270 if (cfg == NULL) break; // Quit at region nodes | |
| 1271 depth++; | |
| 1272 } | |
| 1273 } | |
| 1274 | |
| 1275 //----------- | |
| 1276 // Branch to failure if null | |
| 1277 float ok_prob = PROB_MAX; // a priori estimate: nulls never happen | |
| 1278 Deoptimization::DeoptReason reason; | |
| 1279 if (assert_null) | |
| 1280 reason = Deoptimization::Reason_null_assert; | |
| 1281 else if (type == T_OBJECT) | |
| 1282 reason = Deoptimization::Reason_null_check; | |
| 1283 else | |
| 1284 reason = Deoptimization::Reason_div0_check; | |
| 1285 | |
|
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1286 // %%% Since Reason_unhandled is not recorded on a per-bytecode basis, |
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1287 // ciMethodData::has_trap_at will return a conservative -1 if any |
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1288 // must-be-null assertion has failed. This could cause performance |
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1289 // problems for a method after its first do_null_assert failure. |
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1290 // Consider using 'Reason_class_check' instead? |
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1291 |
| 0 | 1292 // To cause an implicit null check, we set the not-null probability |
| 605 | 1293 // to the maximum (PROB_MAX). For an explicit check the probability |
| 0 | 1294 // is set to a smaller value. |
| 1295 if (null_control != NULL || too_many_traps(reason)) { | |
| 1296 // probability is less likely | |
| 1297 ok_prob = PROB_LIKELY_MAG(3); | |
| 1298 } else if (!assert_null && | |
| 1299 (ImplicitNullCheckThreshold > 0) && | |
| 1300 method() != NULL && | |
| 1301 (method()->method_data()->trap_count(reason) | |
| 1302 >= (uint)ImplicitNullCheckThreshold)) { | |
| 1303 ok_prob = PROB_LIKELY_MAG(3); | |
| 1304 } | |
| 1305 | |
| 1306 if (null_control != NULL) { | |
| 1307 IfNode* iff = create_and_map_if(control(), tst, ok_prob, COUNT_UNKNOWN); | |
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1308 Node* null_true = _gvn.transform( new (C) IfFalseNode(iff)); |
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1309 set_control( _gvn.transform( new (C) IfTrueNode(iff))); |
| 0 | 1310 if (null_true == top()) |
| 1311 explicit_null_checks_elided++; | |
| 1312 (*null_control) = null_true; | |
| 1313 } else { | |
| 1314 BuildCutout unless(this, tst, ok_prob); | |
| 1315 // Check for optimizer eliding test at parse time | |
| 1316 if (stopped()) { | |
| 1317 // Failure not possible; do not bother making uncommon trap. | |
| 1318 explicit_null_checks_elided++; | |
| 1319 } else if (assert_null) { | |
| 1320 uncommon_trap(reason, | |
| 1321 Deoptimization::Action_make_not_entrant, | |
| 1322 NULL, "assert_null"); | |
| 1323 } else { | |
| 332 | 1324 replace_in_map(value, zerocon(type)); |
| 0 | 1325 builtin_throw(reason); |
| 1326 } | |
| 1327 } | |
| 1328 | |
| 1329 // Must throw exception, fall-thru not possible? | |
| 1330 if (stopped()) { | |
| 1331 return top(); // No result | |
| 1332 } | |
| 1333 | |
| 1334 if (assert_null) { | |
| 1335 // Cast obj to null on this path. | |
| 1336 replace_in_map(value, zerocon(type)); | |
| 1337 return zerocon(type); | |
| 1338 } | |
| 1339 | |
| 1340 // Cast obj to not-null on this path, if there is no null_control. | |
| 1341 // (If there is a null_control, a non-null value may come back to haunt us.) | |
| 1342 if (type == T_OBJECT) { | |
| 1343 Node* cast = cast_not_null(value, false); | |
| 1344 if (null_control == NULL || (*null_control) == top()) | |
| 1345 replace_in_map(value, cast); | |
| 1346 value = cast; | |
| 1347 } | |
| 1348 | |
| 1349 return value; | |
| 1350 } | |
| 1351 | |
| 1352 | |
| 1353 //------------------------------cast_not_null---------------------------------- | |
| 1354 // Cast obj to not-null on this path | |
| 1355 Node* GraphKit::cast_not_null(Node* obj, bool do_replace_in_map) { | |
| 1356 const Type *t = _gvn.type(obj); | |
| 1357 const Type *t_not_null = t->join(TypePtr::NOTNULL); | |
| 1358 // Object is already not-null? | |
| 1359 if( t == t_not_null ) return obj; | |
| 1360 | |
|
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1361 Node *cast = new (C) CastPPNode(obj,t_not_null); |
| 0 | 1362 cast->init_req(0, control()); |
| 1363 cast = _gvn.transform( cast ); | |
| 1364 | |
| 1365 // Scan for instances of 'obj' in the current JVM mapping. | |
| 1366 // These instances are known to be not-null after the test. | |
| 1367 if (do_replace_in_map) | |
| 1368 replace_in_map(obj, cast); | |
| 1369 | |
| 1370 return cast; // Return casted value | |
| 1371 } | |
| 1372 | |
| 1373 | |
| 1374 //--------------------------replace_in_map------------------------------------- | |
| 1375 void GraphKit::replace_in_map(Node* old, Node* neww) { | |
| 1376 this->map()->replace_edge(old, neww); | |
| 1377 | |
| 1378 // Note: This operation potentially replaces any edge | |
| 1379 // on the map. This includes locals, stack, and monitors | |
| 1380 // of the current (innermost) JVM state. | |
| 1381 | |
| 1382 // We can consider replacing in caller maps. | |
| 1383 // The idea would be that an inlined function's null checks | |
| 1384 // can be shared with the entire inlining tree. | |
| 1385 // The expense of doing this is that the PreserveJVMState class | |
| 1386 // would have to preserve caller states too, with a deep copy. | |
| 1387 } | |
| 1388 | |
| 1389 | |
| 1390 //============================================================================= | |
| 1391 //--------------------------------memory--------------------------------------- | |
| 1392 Node* GraphKit::memory(uint alias_idx) { | |
| 1393 MergeMemNode* mem = merged_memory(); | |
| 1394 Node* p = mem->memory_at(alias_idx); | |
| 1395 _gvn.set_type(p, Type::MEMORY); // must be mapped | |
| 1396 return p; | |
| 1397 } | |
| 1398 | |
| 1399 //-----------------------------reset_memory------------------------------------ | |
| 1400 Node* GraphKit::reset_memory() { | |
| 1401 Node* mem = map()->memory(); | |
| 1402 // do not use this node for any more parsing! | |
| 1403 debug_only( map()->set_memory((Node*)NULL) ); | |
| 1404 return _gvn.transform( mem ); | |
| 1405 } | |
| 1406 | |
| 1407 //------------------------------set_all_memory--------------------------------- | |
| 1408 void GraphKit::set_all_memory(Node* newmem) { | |
| 1409 Node* mergemem = MergeMemNode::make(C, newmem); | |
| 1410 gvn().set_type_bottom(mergemem); | |
| 1411 map()->set_memory(mergemem); | |
| 1412 } | |
| 1413 | |
| 1414 //------------------------------set_all_memory_call---------------------------- | |
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1415 void GraphKit::set_all_memory_call(Node* call, bool separate_io_proj) { |
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1416 Node* newmem = _gvn.transform( new (C) ProjNode(call, TypeFunc::Memory, separate_io_proj) ); |
| 0 | 1417 set_all_memory(newmem); |
| 1418 } | |
| 1419 | |
| 1420 //============================================================================= | |
| 1421 // | |
| 1422 // parser factory methods for MemNodes | |
| 1423 // | |
| 1424 // These are layered on top of the factory methods in LoadNode and StoreNode, | |
| 1425 // and integrate with the parser's memory state and _gvn engine. | |
| 1426 // | |
| 1427 | |
| 1428 // factory methods in "int adr_idx" | |
| 1429 Node* GraphKit::make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, | |
| 1430 int adr_idx, | |
| 1431 bool require_atomic_access) { | |
| 1432 assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" ); | |
| 1433 const TypePtr* adr_type = NULL; // debug-mode-only argument | |
| 1434 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
| 1435 Node* mem = memory(adr_idx); | |
| 1436 Node* ld; | |
| 1437 if (require_atomic_access && bt == T_LONG) { | |
| 1438 ld = LoadLNode::make_atomic(C, ctl, mem, adr, adr_type, t); | |
| 1439 } else { | |
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1440 ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt); |
| 0 | 1441 } |
| 10278 | 1442 ld = _gvn.transform(ld); |
| 1443 if ((bt == T_OBJECT) && C->do_escape_analysis() || C->eliminate_boxing()) { | |
| 1444 // Improve graph before escape analysis and boxing elimination. | |
| 1445 record_for_igvn(ld); | |
| 1446 } | |
| 1447 return ld; | |
| 0 | 1448 } |
| 1449 | |
| 1450 Node* GraphKit::store_to_memory(Node* ctl, Node* adr, Node *val, BasicType bt, | |
| 1451 int adr_idx, | |
| 1452 bool require_atomic_access) { | |
| 1453 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); | |
| 1454 const TypePtr* adr_type = NULL; | |
| 1455 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
| 1456 Node *mem = memory(adr_idx); | |
| 1457 Node* st; | |
| 1458 if (require_atomic_access && bt == T_LONG) { | |
| 1459 st = StoreLNode::make_atomic(C, ctl, mem, adr, adr_type, val); | |
| 1460 } else { | |
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1461 st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt); |
| 0 | 1462 } |
| 1463 st = _gvn.transform(st); | |
| 1464 set_memory(st, adr_idx); | |
| 1465 // Back-to-back stores can only remove intermediate store with DU info | |
| 1466 // so push on worklist for optimizer. | |
| 1467 if (mem->req() > MemNode::Address && adr == mem->in(MemNode::Address)) | |
| 1468 record_for_igvn(st); | |
| 1469 | |
| 1470 return st; | |
| 1471 } | |
| 1472 | |
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1473 |
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1474 void GraphKit::pre_barrier(bool do_load, |
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1475 Node* ctl, |
| 0 | 1476 Node* obj, |
| 1477 Node* adr, | |
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1478 uint adr_idx, |
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1479 Node* val, |
| 825 | 1480 const TypeOopPtr* val_type, |
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1481 Node* pre_val, |
| 0 | 1482 BasicType bt) { |
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1483 |
| 0 | 1484 BarrierSet* bs = Universe::heap()->barrier_set(); |
| 1485 set_control(ctl); | |
| 1486 switch (bs->kind()) { | |
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1487 case BarrierSet::G1SATBCT: |
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1488 case BarrierSet::G1SATBCTLogging: |
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1489 g1_write_barrier_pre(do_load, obj, adr, adr_idx, val, val_type, pre_val, bt); |
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1490 break; |
| 0 | 1491 |
| 1492 case BarrierSet::CardTableModRef: | |
| 1493 case BarrierSet::CardTableExtension: | |
| 1494 case BarrierSet::ModRef: | |
| 1495 break; | |
| 1496 | |
| 1497 case BarrierSet::Other: | |
| 1498 default : | |
| 1499 ShouldNotReachHere(); | |
| 1500 | |
| 1501 } | |
| 1502 } | |
| 1503 | |
| 1504 void GraphKit::post_barrier(Node* ctl, | |
| 1505 Node* store, | |
| 1506 Node* obj, | |
| 1507 Node* adr, | |
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1508 uint adr_idx, |
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1509 Node* val, |
| 0 | 1510 BasicType bt, |
| 1511 bool use_precise) { | |
| 1512 BarrierSet* bs = Universe::heap()->barrier_set(); | |
| 1513 set_control(ctl); | |
| 1514 switch (bs->kind()) { | |
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1515 case BarrierSet::G1SATBCT: |
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1516 case BarrierSet::G1SATBCTLogging: |
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1517 g1_write_barrier_post(store, obj, adr, adr_idx, val, bt, use_precise); |
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1518 break; |
| 0 | 1519 |
| 1520 case BarrierSet::CardTableModRef: | |
| 1521 case BarrierSet::CardTableExtension: | |
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1522 write_barrier_post(store, obj, adr, adr_idx, val, use_precise); |
| 0 | 1523 break; |
| 1524 | |
| 1525 case BarrierSet::ModRef: | |
| 1526 break; | |
| 1527 | |
| 1528 case BarrierSet::Other: | |
| 1529 default : | |
| 1530 ShouldNotReachHere(); | |
| 1531 | |
| 1532 } | |
| 1533 } | |
| 1534 | |
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1535 Node* GraphKit::store_oop(Node* ctl, |
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1536 Node* obj, |
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1537 Node* adr, |
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1538 const TypePtr* adr_type, |
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1539 Node* val, |
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1540 const TypeOopPtr* val_type, |
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1541 BasicType bt, |
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1542 bool use_precise) { |
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1543 // Transformation of a value which could be NULL pointer (CastPP #NULL) |
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1544 // could be delayed during Parse (for example, in adjust_map_after_if()). |
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1545 // Execute transformation here to avoid barrier generation in such case. |
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1546 if (_gvn.type(val) == TypePtr::NULL_PTR) |
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1547 val = _gvn.makecon(TypePtr::NULL_PTR); |
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1548 |
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1549 set_control(ctl); |
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1550 if (stopped()) return top(); // Dead path ? |
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1551 |
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1552 assert(bt == T_OBJECT, "sanity"); |
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1553 assert(val != NULL, "not dead path"); |
| 0 | 1554 uint adr_idx = C->get_alias_index(adr_type); |
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1555 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); |
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1556 |
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1557 pre_barrier(true /* do_load */, |
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1558 control(), obj, adr, adr_idx, val, val_type, |
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1559 NULL /* pre_val */, |
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1560 bt); |
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1561 |
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1562 Node* store = store_to_memory(control(), adr, val, bt, adr_idx); |
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1563 post_barrier(control(), store, obj, adr, adr_idx, val, bt, use_precise); |
| 0 | 1564 return store; |
| 1565 } | |
| 1566 | |
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1567 // Could be an array or object we don't know at compile time (unsafe ref.) |
| 0 | 1568 Node* GraphKit::store_oop_to_unknown(Node* ctl, |
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1569 Node* obj, // containing obj |
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1570 Node* adr, // actual adress to store val at |
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1571 const TypePtr* adr_type, |
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1572 Node* val, |
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1573 BasicType bt) { |
| 825 | 1574 Compile::AliasType* at = C->alias_type(adr_type); |
| 1575 const TypeOopPtr* val_type = NULL; | |
| 1576 if (adr_type->isa_instptr()) { | |
| 1577 if (at->field() != NULL) { | |
| 1578 // known field. This code is a copy of the do_put_xxx logic. | |
| 1579 ciField* field = at->field(); | |
| 1580 if (!field->type()->is_loaded()) { | |
| 1581 val_type = TypeInstPtr::BOTTOM; | |
| 1582 } else { | |
| 1583 val_type = TypeOopPtr::make_from_klass(field->type()->as_klass()); | |
| 1584 } | |
| 1585 } | |
| 1586 } else if (adr_type->isa_aryptr()) { | |
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1587 val_type = adr_type->is_aryptr()->elem()->make_oopptr(); |
| 825 | 1588 } |
| 1589 if (val_type == NULL) { | |
| 1590 val_type = TypeInstPtr::BOTTOM; | |
| 1591 } | |
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1592 return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, true); |
| 0 | 1593 } |
| 1594 | |
| 1595 | |
| 1596 //-------------------------array_element_address------------------------- | |
| 1597 Node* GraphKit::array_element_address(Node* ary, Node* idx, BasicType elembt, | |
| 1598 const TypeInt* sizetype) { | |
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1599 uint shift = exact_log2(type2aelembytes(elembt)); |
| 0 | 1600 uint header = arrayOopDesc::base_offset_in_bytes(elembt); |
| 1601 | |
| 1602 // short-circuit a common case (saves lots of confusing waste motion) | |
| 1603 jint idx_con = find_int_con(idx, -1); | |
| 1604 if (idx_con >= 0) { | |
| 1605 intptr_t offset = header + ((intptr_t)idx_con << shift); | |
| 1606 return basic_plus_adr(ary, offset); | |
| 1607 } | |
| 1608 | |
| 1609 // must be correct type for alignment purposes | |
| 1610 Node* base = basic_plus_adr(ary, header); | |
| 1611 #ifdef _LP64 | |
| 1612 // The scaled index operand to AddP must be a clean 64-bit value. | |
| 1613 // Java allows a 32-bit int to be incremented to a negative | |
| 1614 // value, which appears in a 64-bit register as a large | |
| 1615 // positive number. Using that large positive number as an | |
| 1616 // operand in pointer arithmetic has bad consequences. | |
| 1617 // On the other hand, 32-bit overflow is rare, and the possibility | |
| 1618 // can often be excluded, if we annotate the ConvI2L node with | |
| 1619 // a type assertion that its value is known to be a small positive | |
| 1620 // number. (The prior range check has ensured this.) | |
| 1621 // This assertion is used by ConvI2LNode::Ideal. | |
| 1622 int index_max = max_jint - 1; // array size is max_jint, index is one less | |
| 1623 if (sizetype != NULL) index_max = sizetype->_hi - 1; | |
| 1624 const TypeLong* lidxtype = TypeLong::make(CONST64(0), index_max, Type::WidenMax); | |
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1625 idx = _gvn.transform( new (C) ConvI2LNode(idx, lidxtype) ); |
| 0 | 1626 #endif |
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1627 Node* scale = _gvn.transform( new (C) LShiftXNode(idx, intcon(shift)) ); |
| 0 | 1628 return basic_plus_adr(ary, base, scale); |
| 1629 } | |
| 1630 | |
| 1631 //-------------------------load_array_element------------------------- | |
| 1632 Node* GraphKit::load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype) { | |
| 1633 const Type* elemtype = arytype->elem(); | |
| 1634 BasicType elembt = elemtype->array_element_basic_type(); | |
| 1635 Node* adr = array_element_address(ary, idx, elembt, arytype->size()); | |
| 1636 Node* ld = make_load(ctl, adr, elemtype, elembt, arytype); | |
| 1637 return ld; | |
| 1638 } | |
| 1639 | |
| 1640 //-------------------------set_arguments_for_java_call------------------------- | |
| 1641 // Arguments (pre-popped from the stack) are taken from the JVMS. | |
| 1642 void GraphKit::set_arguments_for_java_call(CallJavaNode* call) { | |
| 1643 // Add the call arguments: | |
| 1644 uint nargs = call->method()->arg_size(); | |
| 1645 for (uint i = 0; i < nargs; i++) { | |
| 1646 Node* arg = argument(i); | |
| 1647 call->init_req(i + TypeFunc::Parms, arg); | |
| 1648 } | |
| 1649 } | |
| 1650 | |
| 1651 //---------------------------set_edges_for_java_call--------------------------- | |
| 1652 // Connect a newly created call into the current JVMS. | |
| 1653 // A return value node (if any) is returned from set_edges_for_java_call. | |
|
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1654 void GraphKit::set_edges_for_java_call(CallJavaNode* call, bool must_throw, bool separate_io_proj) { |
| 0 | 1655 |
| 1656 // Add the predefined inputs: | |
| 1657 call->init_req( TypeFunc::Control, control() ); | |
| 1658 call->init_req( TypeFunc::I_O , i_o() ); | |
| 1659 call->init_req( TypeFunc::Memory , reset_memory() ); | |
| 1660 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
| 1661 call->init_req( TypeFunc::ReturnAdr, top() ); | |
| 1662 | |
| 1663 add_safepoint_edges(call, must_throw); | |
| 1664 | |
| 1665 Node* xcall = _gvn.transform(call); | |
| 1666 | |
| 1667 if (xcall == top()) { | |
| 1668 set_control(top()); | |
| 1669 return; | |
| 1670 } | |
| 1671 assert(xcall == call, "call identity is stable"); | |
| 1672 | |
| 1673 // Re-use the current map to produce the result. | |
| 1674 | |
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1675 set_control(_gvn.transform(new (C) ProjNode(call, TypeFunc::Control))); |
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1676 set_i_o( _gvn.transform(new (C) ProjNode(call, TypeFunc::I_O , separate_io_proj))); |
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1677 set_all_memory_call(xcall, separate_io_proj); |
| 0 | 1678 |
| 1679 //return xcall; // no need, caller already has it | |
| 1680 } | |
| 1681 | |
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1682 Node* GraphKit::set_results_for_java_call(CallJavaNode* call, bool separate_io_proj) { |
| 0 | 1683 if (stopped()) return top(); // maybe the call folded up? |
| 1684 | |
| 1685 // Capture the return value, if any. | |
| 1686 Node* ret; | |
| 1687 if (call->method() == NULL || | |
| 1688 call->method()->return_type()->basic_type() == T_VOID) | |
| 1689 ret = top(); | |
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1690 else ret = _gvn.transform(new (C) ProjNode(call, TypeFunc::Parms)); |
| 0 | 1691 |
| 1692 // Note: Since any out-of-line call can produce an exception, | |
| 1693 // we always insert an I_O projection from the call into the result. | |
| 1694 | |
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1695 make_slow_call_ex(call, env()->Throwable_klass(), separate_io_proj); |
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1696 |
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1697 if (separate_io_proj) { |
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1698 // The caller requested separate projections be used by the fall |
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1699 // through and exceptional paths, so replace the projections for |
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1700 // the fall through path. |
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1701 set_i_o(_gvn.transform( new (C) ProjNode(call, TypeFunc::I_O) )); |
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1702 set_all_memory(_gvn.transform( new (C) ProjNode(call, TypeFunc::Memory) )); |
|
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1703 } |
| 0 | 1704 return ret; |
| 1705 } | |
| 1706 | |
| 1707 //--------------------set_predefined_input_for_runtime_call-------------------- | |
| 1708 // Reading and setting the memory state is way conservative here. | |
| 1709 // The real problem is that I am not doing real Type analysis on memory, | |
| 1710 // so I cannot distinguish card mark stores from other stores. Across a GC | |
| 1711 // point the Store Barrier and the card mark memory has to agree. I cannot | |
| 1712 // have a card mark store and its barrier split across the GC point from | |
| 1713 // either above or below. Here I get that to happen by reading ALL of memory. | |
| 1714 // A better answer would be to separate out card marks from other memory. | |
| 1715 // For now, return the input memory state, so that it can be reused | |
| 1716 // after the call, if this call has restricted memory effects. | |
| 1717 Node* GraphKit::set_predefined_input_for_runtime_call(SafePointNode* call) { | |
| 1718 // Set fixed predefined input arguments | |
| 1719 Node* memory = reset_memory(); | |
| 1720 call->init_req( TypeFunc::Control, control() ); | |
| 1721 call->init_req( TypeFunc::I_O, top() ); // does no i/o | |
| 1722 call->init_req( TypeFunc::Memory, memory ); // may gc ptrs | |
| 1723 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
| 1724 call->init_req( TypeFunc::ReturnAdr, top() ); | |
| 1725 return memory; | |
| 1726 } | |
| 1727 | |
| 1728 //-------------------set_predefined_output_for_runtime_call-------------------- | |
| 1729 // Set control and memory (not i_o) from the call. | |
| 1730 // If keep_mem is not NULL, use it for the output state, | |
| 1731 // except for the RawPtr output of the call, if hook_mem is TypeRawPtr::BOTTOM. | |
| 1732 // If hook_mem is NULL, this call produces no memory effects at all. | |
| 1733 // If hook_mem is a Java-visible memory slice (such as arraycopy operands), | |
| 1734 // then only that memory slice is taken from the call. | |
| 1735 // In the last case, we must put an appropriate memory barrier before | |
| 1736 // the call, so as to create the correct anti-dependencies on loads | |
| 1737 // preceding the call. | |
| 1738 void GraphKit::set_predefined_output_for_runtime_call(Node* call, | |
| 1739 Node* keep_mem, | |
| 1740 const TypePtr* hook_mem) { | |
| 1741 // no i/o | |
|
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1742 set_control(_gvn.transform( new (C) ProjNode(call,TypeFunc::Control) )); |
| 0 | 1743 if (keep_mem) { |
| 1744 // First clone the existing memory state | |
| 1745 set_all_memory(keep_mem); | |
| 1746 if (hook_mem != NULL) { | |
| 1747 // Make memory for the call | |
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1748 Node* mem = _gvn.transform( new (C) ProjNode(call, TypeFunc::Memory) ); |
| 0 | 1749 // Set the RawPtr memory state only. This covers all the heap top/GC stuff |
| 1750 // We also use hook_mem to extract specific effects from arraycopy stubs. | |
| 1751 set_memory(mem, hook_mem); | |
| 1752 } | |
| 1753 // ...else the call has NO memory effects. | |
| 1754 | |
| 1755 // Make sure the call advertises its memory effects precisely. | |
| 1756 // This lets us build accurate anti-dependences in gcm.cpp. | |
| 1757 assert(C->alias_type(call->adr_type()) == C->alias_type(hook_mem), | |
| 1758 "call node must be constructed correctly"); | |
| 1759 } else { | |
| 1760 assert(hook_mem == NULL, ""); | |
| 1761 // This is not a "slow path" call; all memory comes from the call. | |
| 1762 set_all_memory_call(call); | |
| 1763 } | |
| 1764 } | |
| 1765 | |
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1766 |
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1767 // Replace the call with the current state of the kit. |
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1768 void GraphKit::replace_call(CallNode* call, Node* result) { |
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1769 JVMState* ejvms = NULL; |
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1770 if (has_exceptions()) { |
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1771 ejvms = transfer_exceptions_into_jvms(); |
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1772 } |
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1773 |
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1774 SafePointNode* final_state = stop(); |
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1775 |
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1776 // Find all the needed outputs of this call |
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1777 CallProjections callprojs; |
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1778 call->extract_projections(&callprojs, true); |
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1779 |
|
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1780 Node* init_mem = call->in(TypeFunc::Memory); |
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1781 Node* final_mem = final_state->in(TypeFunc::Memory); |
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1782 Node* final_ctl = final_state->in(TypeFunc::Control); |
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1783 Node* final_io = final_state->in(TypeFunc::I_O); |
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1784 |
|
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1785 // Replace all the old call edges with the edges from the inlining result |
|
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1786 if (callprojs.fallthrough_catchproj != NULL) { |
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1787 C->gvn_replace_by(callprojs.fallthrough_catchproj, final_ctl); |
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1788 } |
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1789 if (callprojs.fallthrough_memproj != NULL) { |
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1790 C->gvn_replace_by(callprojs.fallthrough_memproj, final_mem); |
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1791 } |
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1792 if (callprojs.fallthrough_ioproj != NULL) { |
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1793 C->gvn_replace_by(callprojs.fallthrough_ioproj, final_io); |
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1794 } |
|
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1795 |
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1796 // Replace the result with the new result if it exists and is used |
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1797 if (callprojs.resproj != NULL && result != NULL) { |
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1798 C->gvn_replace_by(callprojs.resproj, result); |
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1799 } |
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1800 |
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1801 if (ejvms == NULL) { |
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1802 // No exception edges to simply kill off those paths |
| 7473 | 1803 if (callprojs.catchall_catchproj != NULL) { |
| 1804 C->gvn_replace_by(callprojs.catchall_catchproj, C->top()); | |
| 1805 } | |
| 1806 if (callprojs.catchall_memproj != NULL) { | |
| 1807 C->gvn_replace_by(callprojs.catchall_memproj, C->top()); | |
| 1808 } | |
| 1809 if (callprojs.catchall_ioproj != NULL) { | |
| 1810 C->gvn_replace_by(callprojs.catchall_ioproj, C->top()); | |
| 1811 } | |
|
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1812 // Replace the old exception object with top |
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1813 if (callprojs.exobj != NULL) { |
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1814 C->gvn_replace_by(callprojs.exobj, C->top()); |
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1815 } |
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1816 } else { |
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1817 GraphKit ekit(ejvms); |
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1818 |
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1819 // Load my combined exception state into the kit, with all phis transformed: |
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1820 SafePointNode* ex_map = ekit.combine_and_pop_all_exception_states(); |
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1821 |
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1822 Node* ex_oop = ekit.use_exception_state(ex_map); |
| 7473 | 1823 if (callprojs.catchall_catchproj != NULL) { |
| 1824 C->gvn_replace_by(callprojs.catchall_catchproj, ekit.control()); | |
| 1825 } | |
| 1826 if (callprojs.catchall_memproj != NULL) { | |
| 1827 C->gvn_replace_by(callprojs.catchall_memproj, ekit.reset_memory()); | |
| 1828 } | |
| 1829 if (callprojs.catchall_ioproj != NULL) { | |
| 1830 C->gvn_replace_by(callprojs.catchall_ioproj, ekit.i_o()); | |
| 1831 } | |
|
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1832 |
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1833 // Replace the old exception object with the newly created one |
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1834 if (callprojs.exobj != NULL) { |
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1835 C->gvn_replace_by(callprojs.exobj, ex_oop); |
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1836 } |
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1837 } |
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1838 |
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1839 // Disconnect the call from the graph |
|
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1840 call->disconnect_inputs(NULL, C); |
|
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1841 C->gvn_replace_by(call, C->top()); |
|
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1842 |
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1843 // Clean up any MergeMems that feed other MergeMems since the |
|
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1844 // optimizer doesn't like that. |
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1845 if (final_mem->is_MergeMem()) { |
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1846 Node_List wl; |
|
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1847 for (SimpleDUIterator i(final_mem); i.has_next(); i.next()) { |
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1848 Node* m = i.get(); |
|
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1849 if (m->is_MergeMem() && !wl.contains(m)) { |
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1850 wl.push(m); |
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1851 } |
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1852 } |
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1853 while (wl.size() > 0) { |
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1854 _gvn.transform(wl.pop()); |
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1855 } |
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1856 } |
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1857 } |
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1858 |
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1859 |
| 0 | 1860 //------------------------------increment_counter------------------------------ |
| 1861 // for statistics: increment a VM counter by 1 | |
| 1862 | |
| 1863 void GraphKit::increment_counter(address counter_addr) { | |
| 1864 Node* adr1 = makecon(TypeRawPtr::make(counter_addr)); | |
| 1865 increment_counter(adr1); | |
| 1866 } | |
| 1867 | |
| 1868 void GraphKit::increment_counter(Node* counter_addr) { | |
| 1869 int adr_type = Compile::AliasIdxRaw; | |
| 1609 | 1870 Node* ctrl = control(); |
| 1871 Node* cnt = make_load(ctrl, counter_addr, TypeInt::INT, T_INT, adr_type); | |
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1872 Node* incr = _gvn.transform(new (C) AddINode(cnt, _gvn.intcon(1))); |
| 1609 | 1873 store_to_memory( ctrl, counter_addr, incr, T_INT, adr_type ); |
| 0 | 1874 } |
| 1875 | |
| 1876 | |
| 1877 //------------------------------uncommon_trap---------------------------------- | |
| 1878 // Bail out to the interpreter in mid-method. Implemented by calling the | |
| 1879 // uncommon_trap blob. This helper function inserts a runtime call with the | |
| 1880 // right debug info. | |
| 1881 void GraphKit::uncommon_trap(int trap_request, | |
| 1882 ciKlass* klass, const char* comment, | |
| 1883 bool must_throw, | |
| 1884 bool keep_exact_action) { | |
| 1885 if (failing()) stop(); | |
| 1886 if (stopped()) return; // trap reachable? | |
| 1887 | |
| 1888 // Note: If ProfileTraps is true, and if a deopt. actually | |
| 1889 // occurs here, the runtime will make sure an MDO exists. There is | |
|
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1890 // no need to call method()->ensure_method_data() at this point. |
| 0 | 1891 |
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1892 // Set the stack pointer to the right value for reexecution: |
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1893 set_sp(reexecute_sp()); |
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1894 |
| 0 | 1895 #ifdef ASSERT |
| 1896 if (!must_throw) { | |
| 1897 // Make sure the stack has at least enough depth to execute | |
| 1898 // the current bytecode. | |
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1899 int inputs, ignored_depth; |
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1900 if (compute_stack_effects(inputs, ignored_depth)) { |
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1901 assert(sp() >= inputs, err_msg_res("must have enough JVMS stack to execute %s: sp=%d, inputs=%d", |
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1902 Bytecodes::name(java_bc()), sp(), inputs)); |
| 0 | 1903 } |
| 1904 } | |
| 1905 #endif | |
| 1906 | |
| 1907 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request); | |
| 1908 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request); | |
| 1909 | |
| 1910 switch (action) { | |
| 1911 case Deoptimization::Action_maybe_recompile: | |
| 1912 case Deoptimization::Action_reinterpret: | |
| 1913 // Temporary fix for 6529811 to allow virtual calls to be sure they | |
| 1914 // get the chance to go from mono->bi->mega | |
| 1915 if (!keep_exact_action && | |
| 1916 Deoptimization::trap_request_index(trap_request) < 0 && | |
| 1917 too_many_recompiles(reason)) { | |
| 1918 // This BCI is causing too many recompilations. | |
| 1919 action = Deoptimization::Action_none; | |
| 1920 trap_request = Deoptimization::make_trap_request(reason, action); | |
| 1921 } else { | |
| 1922 C->set_trap_can_recompile(true); | |
| 1923 } | |
| 1924 break; | |
| 1925 case Deoptimization::Action_make_not_entrant: | |
| 1926 C->set_trap_can_recompile(true); | |
| 1927 break; | |
| 1928 #ifdef ASSERT | |
| 1929 case Deoptimization::Action_none: | |
| 1930 case Deoptimization::Action_make_not_compilable: | |
| 1931 break; | |
| 1932 default: | |
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1933 fatal(err_msg_res("unknown action %d: %s", action, Deoptimization::trap_action_name(action))); |
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1934 break; |
| 0 | 1935 #endif |
| 1936 } | |
| 1937 | |
| 1938 if (TraceOptoParse) { | |
| 1939 char buf[100]; | |
| 1940 tty->print_cr("Uncommon trap %s at bci:%d", | |
| 1941 Deoptimization::format_trap_request(buf, sizeof(buf), | |
| 1942 trap_request), bci()); | |
| 1943 } | |
| 1944 | |
| 1945 CompileLog* log = C->log(); | |
| 1946 if (log != NULL) { | |
| 1947 int kid = (klass == NULL)? -1: log->identify(klass); | |
| 1948 log->begin_elem("uncommon_trap bci='%d'", bci()); | |
| 1949 char buf[100]; | |
| 1950 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), | |
| 1951 trap_request)); | |
| 1952 if (kid >= 0) log->print(" klass='%d'", kid); | |
| 1953 if (comment != NULL) log->print(" comment='%s'", comment); | |
| 1954 log->end_elem(); | |
| 1955 } | |
| 1956 | |
| 1957 // Make sure any guarding test views this path as very unlikely | |
| 1958 Node *i0 = control()->in(0); | |
| 1959 if (i0 != NULL && i0->is_If()) { // Found a guarding if test? | |
| 1960 IfNode *iff = i0->as_If(); | |
| 1961 float f = iff->_prob; // Get prob | |
| 1962 if (control()->Opcode() == Op_IfTrue) { | |
| 1963 if (f > PROB_UNLIKELY_MAG(4)) | |
| 1964 iff->_prob = PROB_MIN; | |
| 1965 } else { | |
| 1966 if (f < PROB_LIKELY_MAG(4)) | |
| 1967 iff->_prob = PROB_MAX; | |
| 1968 } | |
| 1969 } | |
| 1970 | |
| 1971 // Clear out dead values from the debug info. | |
| 1972 kill_dead_locals(); | |
| 1973 | |
| 1974 // Now insert the uncommon trap subroutine call | |
| 1748 | 1975 address call_addr = SharedRuntime::uncommon_trap_blob()->entry_point(); |
| 0 | 1976 const TypePtr* no_memory_effects = NULL; |
| 1977 // Pass the index of the class to be loaded | |
| 1978 Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON | | |
| 1979 (must_throw ? RC_MUST_THROW : 0), | |
| 1980 OptoRuntime::uncommon_trap_Type(), | |
| 1981 call_addr, "uncommon_trap", no_memory_effects, | |
| 1982 intcon(trap_request)); | |
| 1983 assert(call->as_CallStaticJava()->uncommon_trap_request() == trap_request, | |
| 1984 "must extract request correctly from the graph"); | |
| 1985 assert(trap_request != 0, "zero value reserved by uncommon_trap_request"); | |
| 1986 | |
| 1987 call->set_req(TypeFunc::ReturnAdr, returnadr()); | |
| 1988 // The debug info is the only real input to this call. | |
| 1989 | |
| 1990 // Halt-and-catch fire here. The above call should never return! | |
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1991 HaltNode* halt = new(C) HaltNode(control(), frameptr()); |
| 0 | 1992 _gvn.set_type_bottom(halt); |
| 1993 root()->add_req(halt); | |
| 1994 | |
| 1995 stop_and_kill_map(); | |
| 1996 } | |
| 1997 | |
| 1998 | |
| 1999 //--------------------------just_allocated_object------------------------------ | |
| 2000 // Report the object that was just allocated. | |
| 2001 // It must be the case that there are no intervening safepoints. | |
| 2002 // We use this to determine if an object is so "fresh" that | |
| 2003 // it does not require card marks. | |
| 2004 Node* GraphKit::just_allocated_object(Node* current_control) { | |
| 2005 if (C->recent_alloc_ctl() == current_control) | |
| 2006 return C->recent_alloc_obj(); | |
| 2007 return NULL; | |
| 2008 } | |
| 2009 | |
| 2010 | |
| 2011 void GraphKit::round_double_arguments(ciMethod* dest_method) { | |
| 2012 // (Note: TypeFunc::make has a cache that makes this fast.) | |
| 2013 const TypeFunc* tf = TypeFunc::make(dest_method); | |
| 2014 int nargs = tf->_domain->_cnt - TypeFunc::Parms; | |
| 2015 for (int j = 0; j < nargs; j++) { | |
| 2016 const Type *targ = tf->_domain->field_at(j + TypeFunc::Parms); | |
| 2017 if( targ->basic_type() == T_DOUBLE ) { | |
| 2018 // If any parameters are doubles, they must be rounded before | |
| 2019 // the call, dstore_rounding does gvn.transform | |
| 2020 Node *arg = argument(j); | |
| 2021 arg = dstore_rounding(arg); | |
| 2022 set_argument(j, arg); | |
| 2023 } | |
| 2024 } | |
| 2025 } | |
| 2026 | |
| 2027 void GraphKit::round_double_result(ciMethod* dest_method) { | |
| 2028 // A non-strict method may return a double value which has an extended | |
| 2029 // exponent, but this must not be visible in a caller which is 'strict' | |
| 2030 // If a strict caller invokes a non-strict callee, round a double result | |
| 2031 | |
| 2032 BasicType result_type = dest_method->return_type()->basic_type(); | |
| 2033 assert( method() != NULL, "must have caller context"); | |
| 2034 if( result_type == T_DOUBLE && method()->is_strict() && !dest_method->is_strict() ) { | |
| 2035 // Destination method's return value is on top of stack | |
| 2036 // dstore_rounding() does gvn.transform | |
| 2037 Node *result = pop_pair(); | |
| 2038 result = dstore_rounding(result); | |
| 2039 push_pair(result); | |
| 2040 } | |
| 2041 } | |
| 2042 | |
| 2043 // rounding for strict float precision conformance | |
| 2044 Node* GraphKit::precision_rounding(Node* n) { | |
| 2045 return UseStrictFP && _method->flags().is_strict() | |
| 2046 && UseSSE == 0 && Matcher::strict_fp_requires_explicit_rounding | |
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2047 ? _gvn.transform( new (C) RoundFloatNode(0, n) ) |
| 0 | 2048 : n; |
| 2049 } | |
| 2050 | |
| 2051 // rounding for strict double precision conformance | |
| 2052 Node* GraphKit::dprecision_rounding(Node *n) { | |
| 2053 return UseStrictFP && _method->flags().is_strict() | |
| 2054 && UseSSE <= 1 && Matcher::strict_fp_requires_explicit_rounding | |
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2055 ? _gvn.transform( new (C) RoundDoubleNode(0, n) ) |
| 0 | 2056 : n; |
| 2057 } | |
| 2058 | |
| 2059 // rounding for non-strict double stores | |
| 2060 Node* GraphKit::dstore_rounding(Node* n) { | |
| 2061 return Matcher::strict_fp_requires_explicit_rounding | |
| 2062 && UseSSE <= 1 | |
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2063 ? _gvn.transform( new (C) RoundDoubleNode(0, n) ) |
| 0 | 2064 : n; |
| 2065 } | |
| 2066 | |
| 2067 //============================================================================= | |
| 2068 // Generate a fast path/slow path idiom. Graph looks like: | |
| 2069 // [foo] indicates that 'foo' is a parameter | |
| 2070 // | |
| 2071 // [in] NULL | |
| 2072 // \ / | |
| 2073 // CmpP | |
| 2074 // Bool ne | |
| 2075 // If | |
| 2076 // / \ | |
| 2077 // True False-<2> | |
| 2078 // / | | |
| 2079 // / cast_not_null | |
| 2080 // Load | | ^ | |
| 2081 // [fast_test] | | | |
| 2082 // gvn to opt_test | | | |
| 2083 // / \ | <1> | |
| 2084 // True False | | |
| 2085 // | \\ | | |
| 2086 // [slow_call] \[fast_result] | |
| 2087 // Ctl Val \ \ | |
| 2088 // | \ \ | |
| 2089 // Catch <1> \ \ | |
| 2090 // / \ ^ \ \ | |
| 2091 // Ex No_Ex | \ \ | |
| 2092 // | \ \ | \ <2> \ | |
| 2093 // ... \ [slow_res] | | \ [null_result] | |
| 2094 // \ \--+--+--- | | | |
| 2095 // \ | / \ | / | |
| 2096 // --------Region Phi | |
| 2097 // | |
| 2098 //============================================================================= | |
| 2099 // Code is structured as a series of driver functions all called 'do_XXX' that | |
| 2100 // call a set of helper functions. Helper functions first, then drivers. | |
| 2101 | |
| 2102 //------------------------------null_check_oop--------------------------------- | |
| 2103 // Null check oop. Set null-path control into Region in slot 3. | |
| 2104 // Make a cast-not-nullness use the other not-null control. Return cast. | |
| 2105 Node* GraphKit::null_check_oop(Node* value, Node* *null_control, | |
| 2106 bool never_see_null) { | |
| 2107 // Initial NULL check taken path | |
| 2108 (*null_control) = top(); | |
| 2109 Node* cast = null_check_common(value, T_OBJECT, false, null_control); | |
| 2110 | |
| 2111 // Generate uncommon_trap: | |
| 2112 if (never_see_null && (*null_control) != top()) { | |
| 2113 // If we see an unexpected null at a check-cast we record it and force a | |
| 2114 // recompile; the offending check-cast will be compiled to handle NULLs. | |
| 2115 // If we see more than one offending BCI, then all checkcasts in the | |
| 2116 // method will be compiled to handle NULLs. | |
| 2117 PreserveJVMState pjvms(this); | |
| 2118 set_control(*null_control); | |
| 332 | 2119 replace_in_map(value, null()); |
| 0 | 2120 uncommon_trap(Deoptimization::Reason_null_check, |
| 2121 Deoptimization::Action_make_not_entrant); | |
| 2122 (*null_control) = top(); // NULL path is dead | |
| 2123 } | |
| 2124 | |
| 2125 // Cast away null-ness on the result | |
| 2126 return cast; | |
| 2127 } | |
| 2128 | |
| 2129 //------------------------------opt_iff---------------------------------------- | |
| 2130 // Optimize the fast-check IfNode. Set the fast-path region slot 2. | |
| 2131 // Return slow-path control. | |
| 2132 Node* GraphKit::opt_iff(Node* region, Node* iff) { | |
| 2133 IfNode *opt_iff = _gvn.transform(iff)->as_If(); | |
| 2134 | |
| 2135 // Fast path taken; set region slot 2 | |
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2136 Node *fast_taken = _gvn.transform( new (C) IfFalseNode(opt_iff) ); |
| 0 | 2137 region->init_req(2,fast_taken); // Capture fast-control |
| 2138 | |
| 2139 // Fast path not-taken, i.e. slow path | |
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2140 Node *slow_taken = _gvn.transform( new (C) IfTrueNode(opt_iff) ); |
| 0 | 2141 return slow_taken; |
| 2142 } | |
| 2143 | |
| 2144 //-----------------------------make_runtime_call------------------------------- | |
| 2145 Node* GraphKit::make_runtime_call(int flags, | |
| 2146 const TypeFunc* call_type, address call_addr, | |
| 2147 const char* call_name, | |
| 2148 const TypePtr* adr_type, | |
| 2149 // The following parms are all optional. | |
| 2150 // The first NULL ends the list. | |
| 2151 Node* parm0, Node* parm1, | |
| 2152 Node* parm2, Node* parm3, | |
| 2153 Node* parm4, Node* parm5, | |
| 2154 Node* parm6, Node* parm7) { | |
| 2155 // Slow-path call | |
| 2156 bool is_leaf = !(flags & RC_NO_LEAF); | |
| 2157 bool has_io = (!is_leaf && !(flags & RC_NO_IO)); | |
| 2158 if (call_name == NULL) { | |
| 2159 assert(!is_leaf, "must supply name for leaf"); | |
| 2160 call_name = OptoRuntime::stub_name(call_addr); | |
| 2161 } | |
| 2162 CallNode* call; | |
| 2163 if (!is_leaf) { | |
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2164 call = new(C) CallStaticJavaNode(call_type, call_addr, call_name, |
| 0 | 2165 bci(), adr_type); |
| 2166 } else if (flags & RC_NO_FP) { | |
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2167 call = new(C) CallLeafNoFPNode(call_type, call_addr, call_name, adr_type); |
| 0 | 2168 } else { |
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2169 call = new(C) CallLeafNode(call_type, call_addr, call_name, adr_type); |
| 0 | 2170 } |
| 2171 | |
| 2172 // The following is similar to set_edges_for_java_call, | |
| 2173 // except that the memory effects of the call are restricted to AliasIdxRaw. | |
| 2174 | |
| 2175 // Slow path call has no side-effects, uses few values | |
| 2176 bool wide_in = !(flags & RC_NARROW_MEM); | |
| 2177 bool wide_out = (C->get_alias_index(adr_type) == Compile::AliasIdxBot); | |
| 2178 | |
| 2179 Node* prev_mem = NULL; | |
| 2180 if (wide_in) { | |
| 2181 prev_mem = set_predefined_input_for_runtime_call(call); | |
| 2182 } else { | |
| 2183 assert(!wide_out, "narrow in => narrow out"); | |
| 2184 Node* narrow_mem = memory(adr_type); | |
| 2185 prev_mem = reset_memory(); | |
| 2186 map()->set_memory(narrow_mem); | |
| 2187 set_predefined_input_for_runtime_call(call); | |
| 2188 } | |
| 2189 | |
| 2190 // Hook each parm in order. Stop looking at the first NULL. | |
| 2191 if (parm0 != NULL) { call->init_req(TypeFunc::Parms+0, parm0); | |
| 2192 if (parm1 != NULL) { call->init_req(TypeFunc::Parms+1, parm1); | |
| 2193 if (parm2 != NULL) { call->init_req(TypeFunc::Parms+2, parm2); | |
| 2194 if (parm3 != NULL) { call->init_req(TypeFunc::Parms+3, parm3); | |
| 2195 if (parm4 != NULL) { call->init_req(TypeFunc::Parms+4, parm4); | |
| 2196 if (parm5 != NULL) { call->init_req(TypeFunc::Parms+5, parm5); | |
| 2197 if (parm6 != NULL) { call->init_req(TypeFunc::Parms+6, parm6); | |
| 2198 if (parm7 != NULL) { call->init_req(TypeFunc::Parms+7, parm7); | |
| 2199 /* close each nested if ===> */ } } } } } } } } | |
| 2200 assert(call->in(call->req()-1) != NULL, "must initialize all parms"); | |
| 2201 | |
| 2202 if (!is_leaf) { | |
| 2203 // Non-leaves can block and take safepoints: | |
| 2204 add_safepoint_edges(call, ((flags & RC_MUST_THROW) != 0)); | |
| 2205 } | |
| 2206 // Non-leaves can throw exceptions: | |
| 2207 if (has_io) { | |
| 2208 call->set_req(TypeFunc::I_O, i_o()); | |
| 2209 } | |
| 2210 | |
| 2211 if (flags & RC_UNCOMMON) { | |
| 2212 // Set the count to a tiny probability. Cf. Estimate_Block_Frequency. | |
| 2213 // (An "if" probability corresponds roughly to an unconditional count. | |
| 2214 // Sort of.) | |
| 2215 call->set_cnt(PROB_UNLIKELY_MAG(4)); | |
| 2216 } | |
| 2217 | |
| 2218 Node* c = _gvn.transform(call); | |
| 2219 assert(c == call, "cannot disappear"); | |
| 2220 | |
| 2221 if (wide_out) { | |
| 2222 // Slow path call has full side-effects. | |
| 2223 set_predefined_output_for_runtime_call(call); | |
| 2224 } else { | |
| 2225 // Slow path call has few side-effects, and/or sets few values. | |
| 2226 set_predefined_output_for_runtime_call(call, prev_mem, adr_type); | |
| 2227 } | |
| 2228 | |
| 2229 if (has_io) { | |
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2230 set_i_o(_gvn.transform(new (C) ProjNode(call, TypeFunc::I_O))); |
| 0 | 2231 } |
| 2232 return call; | |
| 2233 | |
| 2234 } | |
| 2235 | |
| 2236 //------------------------------merge_memory----------------------------------- | |
| 2237 // Merge memory from one path into the current memory state. | |
| 2238 void GraphKit::merge_memory(Node* new_mem, Node* region, int new_path) { | |
| 2239 for (MergeMemStream mms(merged_memory(), new_mem->as_MergeMem()); mms.next_non_empty2(); ) { | |
| 2240 Node* old_slice = mms.force_memory(); | |
| 2241 Node* new_slice = mms.memory2(); | |
| 2242 if (old_slice != new_slice) { | |
| 2243 PhiNode* phi; | |
| 2244 if (new_slice->is_Phi() && new_slice->as_Phi()->region() == region) { | |
| 2245 phi = new_slice->as_Phi(); | |
| 2246 #ifdef ASSERT | |
| 2247 if (old_slice->is_Phi() && old_slice->as_Phi()->region() == region) | |
| 2248 old_slice = old_slice->in(new_path); | |
| 2249 // Caller is responsible for ensuring that any pre-existing | |
| 2250 // phis are already aware of old memory. | |
| 2251 int old_path = (new_path > 1) ? 1 : 2; // choose old_path != new_path | |
| 2252 assert(phi->in(old_path) == old_slice, "pre-existing phis OK"); | |
| 2253 #endif | |
| 2254 mms.set_memory(phi); | |
| 2255 } else { | |
| 2256 phi = PhiNode::make(region, old_slice, Type::MEMORY, mms.adr_type(C)); | |
| 2257 _gvn.set_type(phi, Type::MEMORY); | |
| 2258 phi->set_req(new_path, new_slice); | |
| 2259 mms.set_memory(_gvn.transform(phi)); // assume it is complete | |
| 2260 } | |
| 2261 } | |
| 2262 } | |
| 2263 } | |
| 2264 | |
| 2265 //------------------------------make_slow_call_ex------------------------------ | |
| 2266 // Make the exception handler hookups for the slow call | |
| 2267 void GraphKit::make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj) { | |
| 2268 if (stopped()) return; | |
| 2269 | |
| 2270 // Make a catch node with just two handlers: fall-through and catch-all | |
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2271 Node* i_o = _gvn.transform( new (C) ProjNode(call, TypeFunc::I_O, separate_io_proj) ); |
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2272 Node* catc = _gvn.transform( new (C) CatchNode(control(), i_o, 2) ); |
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2273 Node* norm = _gvn.transform( new (C) CatchProjNode(catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci) ); |
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2274 Node* excp = _gvn.transform( new (C) CatchProjNode(catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci) ); |
| 0 | 2275 |
| 2276 { PreserveJVMState pjvms(this); | |
| 2277 set_control(excp); | |
| 2278 set_i_o(i_o); | |
| 2279 | |
| 2280 if (excp != top()) { | |
| 2281 // Create an exception state also. | |
| 2282 // Use an exact type if the caller has specified a specific exception. | |
| 2283 const Type* ex_type = TypeOopPtr::make_from_klass_unique(ex_klass)->cast_to_ptr_type(TypePtr::NotNull); | |
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2284 Node* ex_oop = new (C) CreateExNode(ex_type, control(), i_o); |
| 0 | 2285 add_exception_state(make_exception_state(_gvn.transform(ex_oop))); |
| 2286 } | |
| 2287 } | |
| 2288 | |
| 2289 // Get the no-exception control from the CatchNode. | |
| 2290 set_control(norm); | |
| 2291 } | |
| 2292 | |
| 2293 | |
| 2294 //-------------------------------gen_subtype_check----------------------------- | |
| 2295 // Generate a subtyping check. Takes as input the subtype and supertype. | |
| 2296 // Returns 2 values: sets the default control() to the true path and returns | |
| 2297 // the false path. Only reads invariant memory; sets no (visible) memory. | |
| 2298 // The PartialSubtypeCheckNode sets the hidden 1-word cache in the encoding | |
| 2299 // but that's not exposed to the optimizer. This call also doesn't take in an | |
| 2300 // Object; if you wish to check an Object you need to load the Object's class | |
| 2301 // prior to coming here. | |
| 2302 Node* GraphKit::gen_subtype_check(Node* subklass, Node* superklass) { | |
| 2303 // Fast check for identical types, perhaps identical constants. | |
| 2304 // The types can even be identical non-constants, in cases | |
| 2305 // involving Array.newInstance, Object.clone, etc. | |
| 2306 if (subklass == superklass) | |
| 2307 return top(); // false path is dead; no test needed. | |
| 2308 | |
| 2309 if (_gvn.type(superklass)->singleton()) { | |
| 2310 ciKlass* superk = _gvn.type(superklass)->is_klassptr()->klass(); | |
| 2311 ciKlass* subk = _gvn.type(subklass)->is_klassptr()->klass(); | |
| 2312 | |
| 2313 // In the common case of an exact superklass, try to fold up the | |
| 2314 // test before generating code. You may ask, why not just generate | |
| 2315 // the code and then let it fold up? The answer is that the generated | |
| 2316 // code will necessarily include null checks, which do not always | |
| 2317 // completely fold away. If they are also needless, then they turn | |
| 2318 // into a performance loss. Example: | |
| 2319 // Foo[] fa = blah(); Foo x = fa[0]; fa[1] = x; | |
| 2320 // Here, the type of 'fa' is often exact, so the store check | |
| 2321 // of fa[1]=x will fold up, without testing the nullness of x. | |
| 2322 switch (static_subtype_check(superk, subk)) { | |
| 2323 case SSC_always_false: | |
| 2324 { | |
| 2325 Node* always_fail = control(); | |
| 2326 set_control(top()); | |
| 2327 return always_fail; | |
| 2328 } | |
| 2329 case SSC_always_true: | |
| 2330 return top(); | |
| 2331 case SSC_easy_test: | |
| 2332 { | |
| 2333 // Just do a direct pointer compare and be done. | |
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2334 Node* cmp = _gvn.transform( new(C) CmpPNode(subklass, superklass) ); |
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2335 Node* bol = _gvn.transform( new(C) BoolNode(cmp, BoolTest::eq) ); |
| 0 | 2336 IfNode* iff = create_and_xform_if(control(), bol, PROB_STATIC_FREQUENT, COUNT_UNKNOWN); |
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2337 set_control( _gvn.transform( new(C) IfTrueNode (iff) ) ); |
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2338 return _gvn.transform( new(C) IfFalseNode(iff) ); |
| 0 | 2339 } |
| 2340 case SSC_full_test: | |
| 2341 break; | |
| 2342 default: | |
| 2343 ShouldNotReachHere(); | |
| 2344 } | |
| 2345 } | |
| 2346 | |
| 2347 // %%% Possible further optimization: Even if the superklass is not exact, | |
| 2348 // if the subklass is the unique subtype of the superklass, the check | |
| 2349 // will always succeed. We could leave a dependency behind to ensure this. | |
| 2350 | |
| 2351 // First load the super-klass's check-offset | |
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2352 Node *p1 = basic_plus_adr( superklass, superklass, in_bytes(Klass::super_check_offset_offset()) ); |
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2353 Node *chk_off = _gvn.transform( new (C) LoadINode( NULL, memory(p1), p1, _gvn.type(p1)->is_ptr() ) ); |
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2354 int cacheoff_con = in_bytes(Klass::secondary_super_cache_offset()); |
| 0 | 2355 bool might_be_cache = (find_int_con(chk_off, cacheoff_con) == cacheoff_con); |
| 2356 | |
| 2357 // Load from the sub-klass's super-class display list, or a 1-word cache of | |
| 2358 // the secondary superclass list, or a failing value with a sentinel offset | |
| 2359 // if the super-klass is an interface or exceptionally deep in the Java | |
| 2360 // hierarchy and we have to scan the secondary superclass list the hard way. | |
| 2361 // Worst-case type is a little odd: NULL is allowed as a result (usually | |
| 2362 // klass loads can never produce a NULL). | |
| 2363 Node *chk_off_X = ConvI2X(chk_off); | |
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2364 Node *p2 = _gvn.transform( new (C) AddPNode(subklass,subklass,chk_off_X) ); |
| 0 | 2365 // For some types like interfaces the following loadKlass is from a 1-word |
| 2366 // cache which is mutable so can't use immutable memory. Other | |
| 2367 // types load from the super-class display table which is immutable. | |
| 2368 Node *kmem = might_be_cache ? memory(p2) : immutable_memory(); | |
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2369 Node *nkls = _gvn.transform( LoadKlassNode::make( _gvn, kmem, p2, _gvn.type(p2)->is_ptr(), TypeKlassPtr::OBJECT_OR_NULL ) ); |
| 0 | 2370 |
| 2371 // Compile speed common case: ARE a subtype and we canNOT fail | |
| 2372 if( superklass == nkls ) | |
| 2373 return top(); // false path is dead; no test needed. | |
| 2374 | |
| 2375 // See if we get an immediate positive hit. Happens roughly 83% of the | |
| 2376 // time. Test to see if the value loaded just previously from the subklass | |
| 2377 // is exactly the superklass. | |
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2378 Node *cmp1 = _gvn.transform( new (C) CmpPNode( superklass, nkls ) ); |
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2379 Node *bol1 = _gvn.transform( new (C) BoolNode( cmp1, BoolTest::eq ) ); |
| 0 | 2380 IfNode *iff1 = create_and_xform_if( control(), bol1, PROB_LIKELY(0.83f), COUNT_UNKNOWN ); |
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2381 Node *iftrue1 = _gvn.transform( new (C) IfTrueNode ( iff1 ) ); |
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2382 set_control( _gvn.transform( new (C) IfFalseNode( iff1 ) ) ); |
| 0 | 2383 |
| 2384 // Compile speed common case: Check for being deterministic right now. If | |
| 2385 // chk_off is a constant and not equal to cacheoff then we are NOT a | |
| 2386 // subklass. In this case we need exactly the 1 test above and we can | |
| 2387 // return those results immediately. | |
| 2388 if (!might_be_cache) { | |
| 2389 Node* not_subtype_ctrl = control(); | |
| 2390 set_control(iftrue1); // We need exactly the 1 test above | |
| 2391 return not_subtype_ctrl; | |
| 2392 } | |
| 2393 | |
| 2394 // Gather the various success & failures here | |
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2395 RegionNode *r_ok_subtype = new (C) RegionNode(4); |
| 0 | 2396 record_for_igvn(r_ok_subtype); |
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2397 RegionNode *r_not_subtype = new (C) RegionNode(3); |
| 0 | 2398 record_for_igvn(r_not_subtype); |
| 2399 | |
| 2400 r_ok_subtype->init_req(1, iftrue1); | |
| 2401 | |
| 2402 // Check for immediate negative hit. Happens roughly 11% of the time (which | |
| 2403 // is roughly 63% of the remaining cases). Test to see if the loaded | |
| 2404 // check-offset points into the subklass display list or the 1-element | |
| 2405 // cache. If it points to the display (and NOT the cache) and the display | |
| 2406 // missed then it's not a subtype. | |
| 2407 Node *cacheoff = _gvn.intcon(cacheoff_con); | |
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2408 Node *cmp2 = _gvn.transform( new (C) CmpINode( chk_off, cacheoff ) ); |
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2409 Node *bol2 = _gvn.transform( new (C) BoolNode( cmp2, BoolTest::ne ) ); |
| 0 | 2410 IfNode *iff2 = create_and_xform_if( control(), bol2, PROB_LIKELY(0.63f), COUNT_UNKNOWN ); |
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2411 r_not_subtype->init_req(1, _gvn.transform( new (C) IfTrueNode (iff2) ) ); |
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2412 set_control( _gvn.transform( new (C) IfFalseNode(iff2) ) ); |
| 0 | 2413 |
|
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2414 // Check for self. Very rare to get here, but it is taken 1/3 the time. |
| 0 | 2415 // No performance impact (too rare) but allows sharing of secondary arrays |
| 2416 // which has some footprint reduction. | |
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2417 Node *cmp3 = _gvn.transform( new (C) CmpPNode( subklass, superklass ) ); |
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2418 Node *bol3 = _gvn.transform( new (C) BoolNode( cmp3, BoolTest::eq ) ); |
| 0 | 2419 IfNode *iff3 = create_and_xform_if( control(), bol3, PROB_LIKELY(0.36f), COUNT_UNKNOWN ); |
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2420 r_ok_subtype->init_req(2, _gvn.transform( new (C) IfTrueNode ( iff3 ) ) ); |
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2421 set_control( _gvn.transform( new (C) IfFalseNode( iff3 ) ) ); |
| 0 | 2422 |
|
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2423 // -- Roads not taken here: -- |
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2424 // We could also have chosen to perform the self-check at the beginning |
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2425 // of this code sequence, as the assembler does. This would not pay off |
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2426 // the same way, since the optimizer, unlike the assembler, can perform |
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2427 // static type analysis to fold away many successful self-checks. |
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2428 // Non-foldable self checks work better here in second position, because |
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2429 // the initial primary superclass check subsumes a self-check for most |
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2430 // types. An exception would be a secondary type like array-of-interface, |
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2431 // which does not appear in its own primary supertype display. |
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2432 // Finally, we could have chosen to move the self-check into the |
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2433 // PartialSubtypeCheckNode, and from there out-of-line in a platform |
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2434 // dependent manner. But it is worthwhile to have the check here, |
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2435 // where it can be perhaps be optimized. The cost in code space is |
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2436 // small (register compare, branch). |
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2437 |
| 0 | 2438 // Now do a linear scan of the secondary super-klass array. Again, no real |
| 2439 // performance impact (too rare) but it's gotta be done. | |
| 2440 // Since the code is rarely used, there is no penalty for moving it | |
|
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2441 // out of line, and it can only improve I-cache density. |
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2442 // The decision to inline or out-of-line this final check is platform |
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2443 // dependent, and is found in the AD file definition of PartialSubtypeCheck. |
| 0 | 2444 Node* psc = _gvn.transform( |
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2445 new (C) PartialSubtypeCheckNode(control(), subklass, superklass) ); |
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2446 |
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2447 Node *cmp4 = _gvn.transform( new (C) CmpPNode( psc, null() ) ); |
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2448 Node *bol4 = _gvn.transform( new (C) BoolNode( cmp4, BoolTest::ne ) ); |
| 0 | 2449 IfNode *iff4 = create_and_xform_if( control(), bol4, PROB_FAIR, COUNT_UNKNOWN ); |
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2450 r_not_subtype->init_req(2, _gvn.transform( new (C) IfTrueNode (iff4) ) ); |
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2451 r_ok_subtype ->init_req(3, _gvn.transform( new (C) IfFalseNode(iff4) ) ); |
| 0 | 2452 |
| 2453 // Return false path; set default control to true path. | |
| 2454 set_control( _gvn.transform(r_ok_subtype) ); | |
| 2455 return _gvn.transform(r_not_subtype); | |
| 2456 } | |
| 2457 | |
| 2458 //----------------------------static_subtype_check----------------------------- | |
| 2459 // Shortcut important common cases when superklass is exact: | |
| 2460 // (0) superklass is java.lang.Object (can occur in reflective code) | |
| 2461 // (1) subklass is already limited to a subtype of superklass => always ok | |
| 2462 // (2) subklass does not overlap with superklass => always fail | |
| 2463 // (3) superklass has NO subtypes and we can check with a simple compare. | |
| 2464 int GraphKit::static_subtype_check(ciKlass* superk, ciKlass* subk) { | |
| 2465 if (StressReflectiveCode) { | |
| 2466 return SSC_full_test; // Let caller generate the general case. | |
| 2467 } | |
| 2468 | |
| 2469 if (superk == env()->Object_klass()) { | |
| 2470 return SSC_always_true; // (0) this test cannot fail | |
| 2471 } | |
| 2472 | |
| 2473 ciType* superelem = superk; | |
| 2474 if (superelem->is_array_klass()) | |
| 2475 superelem = superelem->as_array_klass()->base_element_type(); | |
| 2476 | |
| 2477 if (!subk->is_interface()) { // cannot trust static interface types yet | |
| 2478 if (subk->is_subtype_of(superk)) { | |
| 2479 return SSC_always_true; // (1) false path dead; no dynamic test needed | |
| 2480 } | |
| 2481 if (!(superelem->is_klass() && superelem->as_klass()->is_interface()) && | |
| 2482 !superk->is_subtype_of(subk)) { | |
| 2483 return SSC_always_false; | |
| 2484 } | |
| 2485 } | |
| 2486 | |
| 2487 // If casting to an instance klass, it must have no subtypes | |
| 2488 if (superk->is_interface()) { | |
| 2489 // Cannot trust interfaces yet. | |
| 2490 // %%% S.B. superk->nof_implementors() == 1 | |
| 2491 } else if (superelem->is_instance_klass()) { | |
| 2492 ciInstanceKlass* ik = superelem->as_instance_klass(); | |
| 2493 if (!ik->has_subklass() && !ik->is_interface()) { | |
| 2494 if (!ik->is_final()) { | |
| 2495 // Add a dependency if there is a chance of a later subclass. | |
| 2496 C->dependencies()->assert_leaf_type(ik); | |
| 2497 } | |
| 2498 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
| 2499 } | |
| 2500 } else { | |
| 2501 // A primitive array type has no subtypes. | |
| 2502 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
| 2503 } | |
| 2504 | |
| 2505 return SSC_full_test; | |
| 2506 } | |
| 2507 | |
| 2508 // Profile-driven exact type check: | |
| 2509 Node* GraphKit::type_check_receiver(Node* receiver, ciKlass* klass, | |
| 2510 float prob, | |
| 2511 Node* *casted_receiver) { | |
| 2512 const TypeKlassPtr* tklass = TypeKlassPtr::make(klass); | |
| 2513 Node* recv_klass = load_object_klass(receiver); | |
| 2514 Node* want_klass = makecon(tklass); | |
|
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|
2515 Node* cmp = _gvn.transform( new(C) CmpPNode(recv_klass, want_klass) ); |
|
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|
2516 Node* bol = _gvn.transform( new(C) BoolNode(cmp, BoolTest::eq) ); |
| 0 | 2517 IfNode* iff = create_and_xform_if(control(), bol, prob, COUNT_UNKNOWN); |
|
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|
2518 set_control( _gvn.transform( new(C) IfTrueNode (iff) )); |
|
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|
2519 Node* fail = _gvn.transform( new(C) IfFalseNode(iff) ); |
| 0 | 2520 |
| 2521 const TypeOopPtr* recv_xtype = tklass->as_instance_type(); | |
| 2522 assert(recv_xtype->klass_is_exact(), ""); | |
| 2523 | |
| 2524 // Subsume downstream occurrences of receiver with a cast to | |
| 2525 // recv_xtype, since now we know what the type will be. | |
|
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|
2526 Node* cast = new(C) CheckCastPPNode(control(), receiver, recv_xtype); |
| 0 | 2527 (*casted_receiver) = _gvn.transform(cast); |
| 2528 // (User must make the replace_in_map call.) | |
| 2529 | |
| 2530 return fail; | |
| 2531 } | |
| 2532 | |
| 2533 | |
|
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|
2534 //------------------------------seems_never_null------------------------------- |
|
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|
2535 // Use null_seen information if it is available from the profile. |
|
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|
2536 // If we see an unexpected null at a type check we record it and force a |
|
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|
2537 // recompile; the offending check will be recompiled to handle NULLs. |
|
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|
2538 // If we see several offending BCIs, then all checks in the |
|
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|
2539 // method will be recompiled. |
|
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|
2540 bool GraphKit::seems_never_null(Node* obj, ciProfileData* data) { |
|
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|
2541 if (UncommonNullCast // Cutout for this technique |
|
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|
2542 && obj != null() // And not the -Xcomp stupid case? |
|
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|
2543 && !too_many_traps(Deoptimization::Reason_null_check) |
|
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|
2544 ) { |
|
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|
2545 if (data == NULL) |
|
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|
2546 // Edge case: no mature data. Be optimistic here. |
|
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|
2547 return true; |
|
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|
2548 // If the profile has not seen a null, assume it won't happen. |
|
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|
2549 assert(java_bc() == Bytecodes::_checkcast || |
|
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|
2550 java_bc() == Bytecodes::_instanceof || |
|
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|
2551 java_bc() == Bytecodes::_aastore, "MDO must collect null_seen bit here"); |
|
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|
2552 return !data->as_BitData()->null_seen(); |
|
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|
2553 } |
|
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|
2554 return false; |
|
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|
2555 } |
|
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|
2556 |
|
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|
2557 //------------------------maybe_cast_profiled_receiver------------------------- |
|
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|
2558 // If the profile has seen exactly one type, narrow to exactly that type. |
|
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|
2559 // Subsequent type checks will always fold up. |
|
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|
2560 Node* GraphKit::maybe_cast_profiled_receiver(Node* not_null_obj, |
|
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|
2561 ciProfileData* data, |
|
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|
2562 ciKlass* require_klass) { |
|
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|
2563 if (!UseTypeProfile || !TypeProfileCasts) return NULL; |
|
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|
2564 if (data == NULL) return NULL; |
|
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|
2565 |
|
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|
2566 // Make sure we haven't already deoptimized from this tactic. |
|
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|
2567 if (too_many_traps(Deoptimization::Reason_class_check)) |
|
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|
2568 return NULL; |
|
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|
2569 |
|
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|
2570 // (No, this isn't a call, but it's enough like a virtual call |
|
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|
2571 // to use the same ciMethod accessor to get the profile info...) |
|
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|
2572 ciCallProfile profile = method()->call_profile_at_bci(bci()); |
|
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|
2573 if (profile.count() >= 0 && // no cast failures here |
|
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|
2574 profile.has_receiver(0) && |
|
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|
2575 profile.morphism() == 1) { |
|
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|
2576 ciKlass* exact_kls = profile.receiver(0); |
|
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|
2577 if (require_klass == NULL || |
|
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|
2578 static_subtype_check(require_klass, exact_kls) == SSC_always_true) { |
|
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|
2579 // If we narrow the type to match what the type profile sees, |
|
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|
2580 // we can then remove the rest of the cast. |
|
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|
2581 // This is a win, even if the exact_kls is very specific, |
|
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|
2582 // because downstream operations, such as method calls, |
|
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|
2583 // will often benefit from the sharper type. |
|
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|
2584 Node* exact_obj = not_null_obj; // will get updated in place... |
|
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|
2585 Node* slow_ctl = type_check_receiver(exact_obj, exact_kls, 1.0, |
|
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|
2586 &exact_obj); |
|
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|
2587 { PreserveJVMState pjvms(this); |
|
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|
2588 set_control(slow_ctl); |
|
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|
2589 uncommon_trap(Deoptimization::Reason_class_check, |
|
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|
2590 Deoptimization::Action_maybe_recompile); |
|
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|
2591 } |
|
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|
2592 replace_in_map(not_null_obj, exact_obj); |
|
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|
2593 return exact_obj; |
|
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|
2594 } |
|
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|
2595 // assert(ssc == SSC_always_true)... except maybe the profile lied to us. |
|
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|
2596 } |
|
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|
2597 |
|
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|
2598 return NULL; |
|
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|
2599 } |
|
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|
2600 |
|
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|
2601 |
| 0 | 2602 //-------------------------------gen_instanceof-------------------------------- |
| 2603 // Generate an instance-of idiom. Used by both the instance-of bytecode | |
| 2604 // and the reflective instance-of call. | |
|
1746
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|
2605 Node* GraphKit::gen_instanceof(Node* obj, Node* superklass) { |
|
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|
2606 kill_dead_locals(); // Benefit all the uncommon traps |
| 0 | 2607 assert( !stopped(), "dead parse path should be checked in callers" ); |
| 2608 assert(!TypePtr::NULL_PTR->higher_equal(_gvn.type(superklass)->is_klassptr()), | |
| 2609 "must check for not-null not-dead klass in callers"); | |
| 2610 | |
| 2611 // Make the merge point | |
| 2612 enum { _obj_path = 1, _fail_path, _null_path, PATH_LIMIT }; | |
|
6804
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|
2613 RegionNode* region = new(C) RegionNode(PATH_LIMIT); |
|
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|
2614 Node* phi = new(C) PhiNode(region, TypeInt::BOOL); |
| 0 | 2615 C->set_has_split_ifs(true); // Has chance for split-if optimization |
| 2616 | |
|
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|
2617 ciProfileData* data = NULL; |
|
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|
2618 if (java_bc() == Bytecodes::_instanceof) { // Only for the bytecode |
|
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|
2619 data = method()->method_data()->bci_to_data(bci()); |
|
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|
2620 } |
|
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|
2621 bool never_see_null = (ProfileDynamicTypes // aggressive use of profile |
|
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|
2622 && seems_never_null(obj, data)); |
|
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|
2623 |
| 0 | 2624 // Null check; get casted pointer; set region slot 3 |
| 2625 Node* null_ctl = top(); | |
|
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|
2626 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); |
| 0 | 2627 |
| 2628 // If not_null_obj is dead, only null-path is taken | |
| 2629 if (stopped()) { // Doing instance-of on a NULL? | |
| 2630 set_control(null_ctl); | |
| 2631 return intcon(0); | |
| 2632 } | |
| 2633 region->init_req(_null_path, null_ctl); | |
| 2634 phi ->init_req(_null_path, intcon(0)); // Set null path value | |
|
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|
2635 if (null_ctl == top()) { |
|
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|
2636 // Do this eagerly, so that pattern matches like is_diamond_phi |
|
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|
2637 // will work even during parsing. |
|
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|
2638 assert(_null_path == PATH_LIMIT-1, "delete last"); |
|
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|
2639 region->del_req(_null_path); |
|
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|
2640 phi ->del_req(_null_path); |
|
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|
2641 } |
|
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|
2642 |
|
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|
2643 if (ProfileDynamicTypes && data != NULL) { |
|
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|
2644 Node* cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, NULL); |
|
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|
2645 if (stopped()) { // Profile disagrees with this path. |
|
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|
2646 set_control(null_ctl); // Null is the only remaining possibility. |
|
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|
2647 return intcon(0); |
|
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|
2648 } |
|
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|
2649 if (cast_obj != NULL) |
|
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|
2650 not_null_obj = cast_obj; |
|
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|
2651 } |
| 0 | 2652 |
| 2653 // Load the object's klass | |
| 2654 Node* obj_klass = load_object_klass(not_null_obj); | |
| 2655 | |
| 2656 // Generate the subtype check | |
| 2657 Node* not_subtype_ctrl = gen_subtype_check(obj_klass, superklass); | |
| 2658 | |
| 2659 // Plug in the success path to the general merge in slot 1. | |
| 2660 region->init_req(_obj_path, control()); | |
| 2661 phi ->init_req(_obj_path, intcon(1)); | |
| 2662 | |
| 2663 // Plug in the failing path to the general merge in slot 2. | |
| 2664 region->init_req(_fail_path, not_subtype_ctrl); | |
| 2665 phi ->init_req(_fail_path, intcon(0)); | |
| 2666 | |
| 2667 // Return final merged results | |
| 2668 set_control( _gvn.transform(region) ); | |
| 2669 record_for_igvn(region); | |
| 2670 return _gvn.transform(phi); | |
| 2671 } | |
| 2672 | |
| 2673 //-------------------------------gen_checkcast--------------------------------- | |
| 2674 // Generate a checkcast idiom. Used by both the checkcast bytecode and the | |
| 2675 // array store bytecode. Stack must be as-if BEFORE doing the bytecode so the | |
| 2676 // uncommon-trap paths work. Adjust stack after this call. | |
| 2677 // If failure_control is supplied and not null, it is filled in with | |
| 2678 // the control edge for the cast failure. Otherwise, an appropriate | |
| 2679 // uncommon trap or exception is thrown. | |
| 2680 Node* GraphKit::gen_checkcast(Node *obj, Node* superklass, | |
| 2681 Node* *failure_control) { | |
| 2682 kill_dead_locals(); // Benefit all the uncommon traps | |
| 2683 const TypeKlassPtr *tk = _gvn.type(superklass)->is_klassptr(); | |
| 2684 const Type *toop = TypeOopPtr::make_from_klass(tk->klass()); | |
| 2685 | |
| 2686 // Fast cutout: Check the case that the cast is vacuously true. | |
| 2687 // This detects the common cases where the test will short-circuit | |
| 2688 // away completely. We do this before we perform the null check, | |
| 2689 // because if the test is going to turn into zero code, we don't | |
| 2690 // want a residual null check left around. (Causes a slowdown, | |
| 2691 // for example, in some objArray manipulations, such as a[i]=a[j].) | |
| 2692 if (tk->singleton()) { | |
| 2693 const TypeOopPtr* objtp = _gvn.type(obj)->isa_oopptr(); | |
| 2694 if (objtp != NULL && objtp->klass() != NULL) { | |
| 2695 switch (static_subtype_check(tk->klass(), objtp->klass())) { | |
| 2696 case SSC_always_true: | |
| 2697 return obj; | |
| 2698 case SSC_always_false: | |
| 2699 // It needs a null check because a null will *pass* the cast check. | |
| 2700 // A non-null value will always produce an exception. | |
|
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2701 return null_assert(obj); |
| 0 | 2702 } |
| 2703 } | |
| 2704 } | |
| 2705 | |
| 2706 ciProfileData* data = NULL; | |
| 2707 if (failure_control == NULL) { // use MDO in regular case only | |
| 2708 assert(java_bc() == Bytecodes::_aastore || | |
| 2709 java_bc() == Bytecodes::_checkcast, | |
| 2710 "interpreter profiles type checks only for these BCs"); | |
| 2711 data = method()->method_data()->bci_to_data(bci()); | |
| 2712 } | |
| 2713 | |
| 2714 // Make the merge point | |
| 2715 enum { _obj_path = 1, _null_path, PATH_LIMIT }; | |
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2716 RegionNode* region = new (C) RegionNode(PATH_LIMIT); |
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2717 Node* phi = new (C) PhiNode(region, toop); |
| 0 | 2718 C->set_has_split_ifs(true); // Has chance for split-if optimization |
| 2719 | |
| 2720 // Use null-cast information if it is available | |
|
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2721 bool never_see_null = ((failure_control == NULL) // regular case only |
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2722 && seems_never_null(obj, data)); |
| 0 | 2723 |
| 2724 // Null check; get casted pointer; set region slot 3 | |
| 2725 Node* null_ctl = top(); | |
| 2726 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); | |
| 2727 | |
| 2728 // If not_null_obj is dead, only null-path is taken | |
| 2729 if (stopped()) { // Doing instance-of on a NULL? | |
| 2730 set_control(null_ctl); | |
| 2731 return null(); | |
| 2732 } | |
| 2733 region->init_req(_null_path, null_ctl); | |
| 2734 phi ->init_req(_null_path, null()); // Set null path value | |
|
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2735 if (null_ctl == top()) { |
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2736 // Do this eagerly, so that pattern matches like is_diamond_phi |
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2737 // will work even during parsing. |
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2738 assert(_null_path == PATH_LIMIT-1, "delete last"); |
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2739 region->del_req(_null_path); |
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2740 phi ->del_req(_null_path); |
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2741 } |
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2742 |
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2743 Node* cast_obj = NULL; |
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2744 if (data != NULL && |
| 0 | 2745 // Counter has never been decremented (due to cast failure). |
| 2746 // ...This is a reasonable thing to expect. It is true of | |
| 2747 // all casts inserted by javac to implement generic types. | |
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2748 data->as_CounterData()->count() >= 0) { |
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2749 cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, tk->klass()); |
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2750 if (cast_obj != NULL) { |
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2751 if (failure_control != NULL) // failure is now impossible |
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2752 (*failure_control) = top(); |
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2753 // adjust the type of the phi to the exact klass: |
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2754 phi->raise_bottom_type(_gvn.type(cast_obj)->meet(TypePtr::NULL_PTR)); |
| 0 | 2755 } |
| 2756 } | |
| 2757 | |
| 2758 if (cast_obj == NULL) { | |
| 2759 // Load the object's klass | |
| 2760 Node* obj_klass = load_object_klass(not_null_obj); | |
| 2761 | |
| 2762 // Generate the subtype check | |
| 2763 Node* not_subtype_ctrl = gen_subtype_check( obj_klass, superklass ); | |
| 2764 | |
| 2765 // Plug in success path into the merge | |
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2766 cast_obj = _gvn.transform(new (C) CheckCastPPNode(control(), |
| 0 | 2767 not_null_obj, toop)); |
| 2768 // Failure path ends in uncommon trap (or may be dead - failure impossible) | |
| 2769 if (failure_control == NULL) { | |
| 2770 if (not_subtype_ctrl != top()) { // If failure is possible | |
| 2771 PreserveJVMState pjvms(this); | |
| 2772 set_control(not_subtype_ctrl); | |
| 2773 builtin_throw(Deoptimization::Reason_class_check, obj_klass); | |
| 2774 } | |
| 2775 } else { | |
| 2776 (*failure_control) = not_subtype_ctrl; | |
| 2777 } | |
| 2778 } | |
| 2779 | |
| 2780 region->init_req(_obj_path, control()); | |
| 2781 phi ->init_req(_obj_path, cast_obj); | |
| 2782 | |
| 2783 // A merge of NULL or Casted-NotNull obj | |
| 2784 Node* res = _gvn.transform(phi); | |
| 2785 | |
| 2786 // Note I do NOT always 'replace_in_map(obj,result)' here. | |
| 2787 // if( tk->klass()->can_be_primary_super() ) | |
| 2788 // This means that if I successfully store an Object into an array-of-String | |
| 2789 // I 'forget' that the Object is really now known to be a String. I have to | |
| 2790 // do this because we don't have true union types for interfaces - if I store | |
| 2791 // a Baz into an array-of-Interface and then tell the optimizer it's an | |
| 2792 // Interface, I forget that it's also a Baz and cannot do Baz-like field | |
| 2793 // references to it. FIX THIS WHEN UNION TYPES APPEAR! | |
| 2794 // replace_in_map( obj, res ); | |
| 2795 | |
| 2796 // Return final merged results | |
| 2797 set_control( _gvn.transform(region) ); | |
| 2798 record_for_igvn(region); | |
| 2799 return res; | |
| 2800 } | |
| 2801 | |
| 2802 //------------------------------next_monitor----------------------------------- | |
| 2803 // What number should be given to the next monitor? | |
| 2804 int GraphKit::next_monitor() { | |
| 2805 int current = jvms()->monitor_depth()* C->sync_stack_slots(); | |
| 2806 int next = current + C->sync_stack_slots(); | |
| 2807 // Keep the toplevel high water mark current: | |
| 2808 if (C->fixed_slots() < next) C->set_fixed_slots(next); | |
| 2809 return current; | |
| 2810 } | |
| 2811 | |
| 2812 //------------------------------insert_mem_bar--------------------------------- | |
| 2813 // Memory barrier to avoid floating things around | |
| 2814 // The membar serves as a pinch point between both control and all memory slices. | |
| 2815 Node* GraphKit::insert_mem_bar(int opcode, Node* precedent) { | |
| 2816 MemBarNode* mb = MemBarNode::make(C, opcode, Compile::AliasIdxBot, precedent); | |
| 2817 mb->init_req(TypeFunc::Control, control()); | |
| 2818 mb->init_req(TypeFunc::Memory, reset_memory()); | |
| 2819 Node* membar = _gvn.transform(mb); | |
|
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2820 set_control(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Control))); |
| 0 | 2821 set_all_memory_call(membar); |
| 2822 return membar; | |
| 2823 } | |
| 2824 | |
| 2825 //-------------------------insert_mem_bar_volatile---------------------------- | |
| 2826 // Memory barrier to avoid floating things around | |
| 2827 // The membar serves as a pinch point between both control and memory(alias_idx). | |
| 2828 // If you want to make a pinch point on all memory slices, do not use this | |
| 2829 // function (even with AliasIdxBot); use insert_mem_bar() instead. | |
| 2830 Node* GraphKit::insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent) { | |
| 2831 // When Parse::do_put_xxx updates a volatile field, it appends a series | |
| 2832 // of MemBarVolatile nodes, one for *each* volatile field alias category. | |
| 2833 // The first membar is on the same memory slice as the field store opcode. | |
| 2834 // This forces the membar to follow the store. (Bug 6500685 broke this.) | |
| 2835 // All the other membars (for other volatile slices, including AliasIdxBot, | |
| 2836 // which stands for all unknown volatile slices) are control-dependent | |
| 2837 // on the first membar. This prevents later volatile loads or stores | |
| 2838 // from sliding up past the just-emitted store. | |
| 2839 | |
| 2840 MemBarNode* mb = MemBarNode::make(C, opcode, alias_idx, precedent); | |
| 2841 mb->set_req(TypeFunc::Control,control()); | |
| 2842 if (alias_idx == Compile::AliasIdxBot) { | |
| 2843 mb->set_req(TypeFunc::Memory, merged_memory()->base_memory()); | |
| 2844 } else { | |
| 2845 assert(!(opcode == Op_Initialize && alias_idx != Compile::AliasIdxRaw), "fix caller"); | |
| 2846 mb->set_req(TypeFunc::Memory, memory(alias_idx)); | |
| 2847 } | |
| 2848 Node* membar = _gvn.transform(mb); | |
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2849 set_control(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Control))); |
| 0 | 2850 if (alias_idx == Compile::AliasIdxBot) { |
|
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2851 merged_memory()->set_base_memory(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Memory))); |
| 0 | 2852 } else { |
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2853 set_memory(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Memory)),alias_idx); |
| 0 | 2854 } |
| 2855 return membar; | |
| 2856 } | |
| 2857 | |
| 2858 //------------------------------shared_lock------------------------------------ | |
| 2859 // Emit locking code. | |
| 2860 FastLockNode* GraphKit::shared_lock(Node* obj) { | |
| 2861 // bci is either a monitorenter bc or InvocationEntryBci | |
| 2862 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
| 2863 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
| 2864 | |
| 2865 if( !GenerateSynchronizationCode ) | |
| 2866 return NULL; // Not locking things? | |
| 2867 if (stopped()) // Dead monitor? | |
| 2868 return NULL; | |
| 2869 | |
| 2870 assert(dead_locals_are_killed(), "should kill locals before sync. point"); | |
| 2871 | |
| 2872 // Box the stack location | |
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2873 Node* box = _gvn.transform(new (C) BoxLockNode(next_monitor())); |
| 0 | 2874 Node* mem = reset_memory(); |
| 2875 | |
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2876 FastLockNode * flock = _gvn.transform(new (C) FastLockNode(0, obj, box) )->as_FastLock(); |
| 0 | 2877 if (PrintPreciseBiasedLockingStatistics) { |
| 2878 // Create the counters for this fast lock. | |
| 2879 flock->create_lock_counter(sync_jvms()); // sync_jvms used to get current bci | |
| 2880 } | |
| 2881 // Add monitor to debug info for the slow path. If we block inside the | |
| 2882 // slow path and de-opt, we need the monitor hanging around | |
| 2883 map()->push_monitor( flock ); | |
| 2884 | |
| 2885 const TypeFunc *tf = LockNode::lock_type(); | |
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2886 LockNode *lock = new (C) LockNode(C, tf); |
| 0 | 2887 |
| 2888 lock->init_req( TypeFunc::Control, control() ); | |
| 2889 lock->init_req( TypeFunc::Memory , mem ); | |
| 2890 lock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
| 2891 lock->init_req( TypeFunc::FramePtr, frameptr() ); | |
| 2892 lock->init_req( TypeFunc::ReturnAdr, top() ); | |
| 2893 | |
| 2894 lock->init_req(TypeFunc::Parms + 0, obj); | |
| 2895 lock->init_req(TypeFunc::Parms + 1, box); | |
| 2896 lock->init_req(TypeFunc::Parms + 2, flock); | |
| 2897 add_safepoint_edges(lock); | |
| 2898 | |
| 2899 lock = _gvn.transform( lock )->as_Lock(); | |
| 2900 | |
| 2901 // lock has no side-effects, sets few values | |
| 2902 set_predefined_output_for_runtime_call(lock, mem, TypeRawPtr::BOTTOM); | |
| 2903 | |
|
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|
2904 insert_mem_bar(Op_MemBarAcquireLock); |
| 0 | 2905 |
| 2906 // Add this to the worklist so that the lock can be eliminated | |
| 2907 record_for_igvn(lock); | |
| 2908 | |
| 2909 #ifndef PRODUCT | |
| 2910 if (PrintLockStatistics) { | |
| 2911 // Update the counter for this lock. Don't bother using an atomic | |
| 2912 // operation since we don't require absolute accuracy. | |
| 2913 lock->create_lock_counter(map()->jvms()); | |
| 1609 | 2914 increment_counter(lock->counter()->addr()); |
| 0 | 2915 } |
| 2916 #endif | |
| 2917 | |
| 2918 return flock; | |
| 2919 } | |
| 2920 | |
| 2921 | |
| 2922 //------------------------------shared_unlock---------------------------------- | |
| 2923 // Emit unlocking code. | |
| 2924 void GraphKit::shared_unlock(Node* box, Node* obj) { | |
| 2925 // bci is either a monitorenter bc or InvocationEntryBci | |
| 2926 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
| 2927 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
| 2928 | |
| 2929 if( !GenerateSynchronizationCode ) | |
| 2930 return; | |
| 2931 if (stopped()) { // Dead monitor? | |
| 2932 map()->pop_monitor(); // Kill monitor from debug info | |
| 2933 return; | |
| 2934 } | |
| 2935 | |
| 2936 // Memory barrier to avoid floating things down past the locked region | |
|
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2937 insert_mem_bar(Op_MemBarReleaseLock); |
| 0 | 2938 |
| 2939 const TypeFunc *tf = OptoRuntime::complete_monitor_exit_Type(); | |
|
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2940 UnlockNode *unlock = new (C) UnlockNode(C, tf); |
| 0 | 2941 uint raw_idx = Compile::AliasIdxRaw; |
| 2942 unlock->init_req( TypeFunc::Control, control() ); | |
| 2943 unlock->init_req( TypeFunc::Memory , memory(raw_idx) ); | |
| 2944 unlock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
| 2945 unlock->init_req( TypeFunc::FramePtr, frameptr() ); | |
| 2946 unlock->init_req( TypeFunc::ReturnAdr, top() ); | |
| 2947 | |
| 2948 unlock->init_req(TypeFunc::Parms + 0, obj); | |
| 2949 unlock->init_req(TypeFunc::Parms + 1, box); | |
| 2950 unlock = _gvn.transform(unlock)->as_Unlock(); | |
| 2951 | |
| 2952 Node* mem = reset_memory(); | |
| 2953 | |
| 2954 // unlock has no side-effects, sets few values | |
| 2955 set_predefined_output_for_runtime_call(unlock, mem, TypeRawPtr::BOTTOM); | |
| 2956 | |
| 2957 // Kill monitor from debug info | |
| 2958 map()->pop_monitor( ); | |
| 2959 } | |
| 2960 | |
| 2961 //-------------------------------get_layout_helper----------------------------- | |
| 2962 // If the given klass is a constant or known to be an array, | |
| 2963 // fetch the constant layout helper value into constant_value | |
| 2964 // and return (Node*)NULL. Otherwise, load the non-constant | |
| 2965 // layout helper value, and return the node which represents it. | |
| 2966 // This two-faced routine is useful because allocation sites | |
| 2967 // almost always feature constant types. | |
| 2968 Node* GraphKit::get_layout_helper(Node* klass_node, jint& constant_value) { | |
| 2969 const TypeKlassPtr* inst_klass = _gvn.type(klass_node)->isa_klassptr(); | |
| 2970 if (!StressReflectiveCode && inst_klass != NULL) { | |
| 2971 ciKlass* klass = inst_klass->klass(); | |
| 2972 bool xklass = inst_klass->klass_is_exact(); | |
| 2973 if (xklass || klass->is_array_klass()) { | |
| 2974 jint lhelper = klass->layout_helper(); | |
| 2975 if (lhelper != Klass::_lh_neutral_value) { | |
| 2976 constant_value = lhelper; | |
| 2977 return (Node*) NULL; | |
| 2978 } | |
| 2979 } | |
| 2980 } | |
| 2981 constant_value = Klass::_lh_neutral_value; // put in a known value | |
|
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|
2982 Node* lhp = basic_plus_adr(klass_node, klass_node, in_bytes(Klass::layout_helper_offset())); |
| 0 | 2983 return make_load(NULL, lhp, TypeInt::INT, T_INT); |
| 2984 } | |
| 2985 | |
| 2986 // We just put in an allocate/initialize with a big raw-memory effect. | |
| 2987 // Hook selected additional alias categories on the initialization. | |
| 2988 static void hook_memory_on_init(GraphKit& kit, int alias_idx, | |
| 2989 MergeMemNode* init_in_merge, | |
| 2990 Node* init_out_raw) { | |
| 2991 DEBUG_ONLY(Node* init_in_raw = init_in_merge->base_memory()); | |
| 2992 assert(init_in_merge->memory_at(alias_idx) == init_in_raw, ""); | |
| 2993 | |
| 2994 Node* prevmem = kit.memory(alias_idx); | |
| 2995 init_in_merge->set_memory_at(alias_idx, prevmem); | |
| 2996 kit.set_memory(init_out_raw, alias_idx); | |
| 2997 } | |
| 2998 | |
| 2999 //---------------------------set_output_for_allocation------------------------- | |
| 3000 Node* GraphKit::set_output_for_allocation(AllocateNode* alloc, | |
|
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3001 const TypeOopPtr* oop_type) { |
| 0 | 3002 int rawidx = Compile::AliasIdxRaw; |
| 3003 alloc->set_req( TypeFunc::FramePtr, frameptr() ); | |
| 3004 add_safepoint_edges(alloc); | |
| 3005 Node* allocx = _gvn.transform(alloc); | |
|
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3006 set_control( _gvn.transform(new (C) ProjNode(allocx, TypeFunc::Control) ) ); |
| 0 | 3007 // create memory projection for i_o |
|
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3008 set_memory ( _gvn.transform( new (C) ProjNode(allocx, TypeFunc::Memory, true) ), rawidx ); |
|
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3009 make_slow_call_ex(allocx, env()->Throwable_klass(), true); |
| 0 | 3010 |
| 3011 // create a memory projection as for the normal control path | |
|
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3012 Node* malloc = _gvn.transform(new (C) ProjNode(allocx, TypeFunc::Memory)); |
| 0 | 3013 set_memory(malloc, rawidx); |
| 3014 | |
| 3015 // a normal slow-call doesn't change i_o, but an allocation does | |
| 3016 // we create a separate i_o projection for the normal control path | |
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3017 set_i_o(_gvn.transform( new (C) ProjNode(allocx, TypeFunc::I_O, false) ) ); |
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3018 Node* rawoop = _gvn.transform( new (C) ProjNode(allocx, TypeFunc::Parms) ); |
| 0 | 3019 |
| 3020 // put in an initialization barrier | |
| 3021 InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, rawidx, | |
| 3022 rawoop)->as_Initialize(); | |
| 3023 assert(alloc->initialization() == init, "2-way macro link must work"); | |
| 3024 assert(init ->allocation() == alloc, "2-way macro link must work"); | |
|
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3025 { |
| 0 | 3026 // Extract memory strands which may participate in the new object's |
| 3027 // initialization, and source them from the new InitializeNode. | |
| 3028 // This will allow us to observe initializations when they occur, | |
| 3029 // and link them properly (as a group) to the InitializeNode. | |
| 3030 assert(init->in(InitializeNode::Memory) == malloc, ""); | |
| 3031 MergeMemNode* minit_in = MergeMemNode::make(C, malloc); | |
| 3032 init->set_req(InitializeNode::Memory, minit_in); | |
| 3033 record_for_igvn(minit_in); // fold it up later, if possible | |
| 3034 Node* minit_out = memory(rawidx); | |
| 3035 assert(minit_out->is_Proj() && minit_out->in(0) == init, ""); | |
| 3036 if (oop_type->isa_aryptr()) { | |
| 3037 const TypePtr* telemref = oop_type->add_offset(Type::OffsetBot); | |
| 3038 int elemidx = C->get_alias_index(telemref); | |
| 3039 hook_memory_on_init(*this, elemidx, minit_in, minit_out); | |
| 3040 } else if (oop_type->isa_instptr()) { | |
| 3041 ciInstanceKlass* ik = oop_type->klass()->as_instance_klass(); | |
| 3042 for (int i = 0, len = ik->nof_nonstatic_fields(); i < len; i++) { | |
| 3043 ciField* field = ik->nonstatic_field_at(i); | |
|
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3044 if (field->offset() >= TrackedInitializationLimit * HeapWordSize) |
| 0 | 3045 continue; // do not bother to track really large numbers of fields |
| 3046 // Find (or create) the alias category for this field: | |
| 3047 int fieldidx = C->alias_type(field)->index(); | |
| 3048 hook_memory_on_init(*this, fieldidx, minit_in, minit_out); | |
| 3049 } | |
| 3050 } | |
| 3051 } | |
| 3052 | |
| 3053 // Cast raw oop to the real thing... | |
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3054 Node* javaoop = new (C) CheckCastPPNode(control(), rawoop, oop_type); |
| 0 | 3055 javaoop = _gvn.transform(javaoop); |
| 3056 C->set_recent_alloc(control(), javaoop); | |
| 3057 assert(just_allocated_object(control()) == javaoop, "just allocated"); | |
| 3058 | |
| 3059 #ifdef ASSERT | |
|
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3060 { // Verify that the AllocateNode::Ideal_allocation recognizers work: |
|
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3061 assert(AllocateNode::Ideal_allocation(rawoop, &_gvn) == alloc, |
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3062 "Ideal_allocation works"); |
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3063 assert(AllocateNode::Ideal_allocation(javaoop, &_gvn) == alloc, |
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3064 "Ideal_allocation works"); |
| 0 | 3065 if (alloc->is_AllocateArray()) { |
|
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3066 assert(AllocateArrayNode::Ideal_array_allocation(rawoop, &_gvn) == alloc->as_AllocateArray(), |
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3067 "Ideal_allocation works"); |
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3068 assert(AllocateArrayNode::Ideal_array_allocation(javaoop, &_gvn) == alloc->as_AllocateArray(), |
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3069 "Ideal_allocation works"); |
| 0 | 3070 } else { |
|
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3071 assert(alloc->in(AllocateNode::ALength)->is_top(), "no length, please"); |
| 0 | 3072 } |
| 3073 } | |
| 3074 #endif //ASSERT | |
| 3075 | |
| 3076 return javaoop; | |
| 3077 } | |
| 3078 | |
| 3079 //---------------------------new_instance-------------------------------------- | |
| 3080 // This routine takes a klass_node which may be constant (for a static type) | |
| 3081 // or may be non-constant (for reflective code). It will work equally well | |
| 3082 // for either, and the graph will fold nicely if the optimizer later reduces | |
| 3083 // the type to a constant. | |
| 3084 // The optional arguments are for specialized use by intrinsics: | |
| 3085 // - If 'extra_slow_test' if not null is an extra condition for the slow-path. | |
| 3086 // - If 'return_size_val', report the the total object size to the caller. | |
| 3087 Node* GraphKit::new_instance(Node* klass_node, | |
| 3088 Node* extra_slow_test, | |
| 3089 Node* *return_size_val) { | |
| 3090 // Compute size in doublewords | |
| 3091 // The size is always an integral number of doublewords, represented | |
| 3092 // as a positive bytewise size stored in the klass's layout_helper. | |
| 3093 // The layout_helper also encodes (in a low bit) the need for a slow path. | |
| 3094 jint layout_con = Klass::_lh_neutral_value; | |
| 3095 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
| 3096 int layout_is_con = (layout_val == NULL); | |
| 3097 | |
| 3098 if (extra_slow_test == NULL) extra_slow_test = intcon(0); | |
| 3099 // Generate the initial go-slow test. It's either ALWAYS (return a | |
| 3100 // Node for 1) or NEVER (return a NULL) or perhaps (in the reflective | |
| 3101 // case) a computed value derived from the layout_helper. | |
| 3102 Node* initial_slow_test = NULL; | |
| 3103 if (layout_is_con) { | |
| 3104 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
| 3105 bool must_go_slow = Klass::layout_helper_needs_slow_path(layout_con); | |
| 3106 initial_slow_test = must_go_slow? intcon(1): extra_slow_test; | |
| 3107 | |
| 3108 } else { // reflective case | |
| 3109 // This reflective path is used by Unsafe.allocateInstance. | |
| 3110 // (It may be stress-tested by specifying StressReflectiveCode.) | |
| 3111 // Basically, we want to get into the VM is there's an illegal argument. | |
| 3112 Node* bit = intcon(Klass::_lh_instance_slow_path_bit); | |
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3113 initial_slow_test = _gvn.transform( new (C) AndINode(layout_val, bit) ); |
| 0 | 3114 if (extra_slow_test != intcon(0)) { |
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3115 initial_slow_test = _gvn.transform( new (C) OrINode(initial_slow_test, extra_slow_test) ); |
| 0 | 3116 } |
| 3117 // (Macro-expander will further convert this to a Bool, if necessary.) | |
| 3118 } | |
| 3119 | |
| 3120 // Find the size in bytes. This is easy; it's the layout_helper. | |
| 3121 // The size value must be valid even if the slow path is taken. | |
| 3122 Node* size = NULL; | |
| 3123 if (layout_is_con) { | |
| 3124 size = MakeConX(Klass::layout_helper_size_in_bytes(layout_con)); | |
| 3125 } else { // reflective case | |
| 3126 // This reflective path is used by clone and Unsafe.allocateInstance. | |
| 3127 size = ConvI2X(layout_val); | |
| 3128 | |
| 3129 // Clear the low bits to extract layout_helper_size_in_bytes: | |
| 3130 assert((int)Klass::_lh_instance_slow_path_bit < BytesPerLong, "clear bit"); | |
| 3131 Node* mask = MakeConX(~ (intptr_t)right_n_bits(LogBytesPerLong)); | |
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3132 size = _gvn.transform( new (C) AndXNode(size, mask) ); |
| 0 | 3133 } |
| 3134 if (return_size_val != NULL) { | |
| 3135 (*return_size_val) = size; | |
| 3136 } | |
| 3137 | |
| 3138 // This is a precise notnull oop of the klass. | |
| 3139 // (Actually, it need not be precise if this is a reflective allocation.) | |
| 3140 // It's what we cast the result to. | |
| 3141 const TypeKlassPtr* tklass = _gvn.type(klass_node)->isa_klassptr(); | |
| 3142 if (!tklass) tklass = TypeKlassPtr::OBJECT; | |
| 3143 const TypeOopPtr* oop_type = tklass->as_instance_type(); | |
| 3144 | |
| 3145 // Now generate allocation code | |
|
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3146 |
|
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3147 // The entire memory state is needed for slow path of the allocation |
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3148 // since GC and deoptimization can happened. |
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3149 Node *mem = reset_memory(); |
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3150 set_all_memory(mem); // Create new memory state |
|
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3151 |
| 0 | 3152 AllocateNode* alloc |
| 10278 | 3153 = new (C) AllocateNode(C, AllocateNode::alloc_type(Type::TOP), |
|
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3154 control(), mem, i_o(), |
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3155 size, klass_node, |
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3156 initial_slow_test); |
| 0 | 3157 |
|
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3158 return set_output_for_allocation(alloc, oop_type); |
| 0 | 3159 } |
| 3160 | |
| 3161 //-------------------------------new_array------------------------------------- | |
| 3162 // helper for both newarray and anewarray | |
| 3163 // The 'length' parameter is (obviously) the length of the array. | |
| 3164 // See comments on new_instance for the meaning of the other arguments. | |
| 3165 Node* GraphKit::new_array(Node* klass_node, // array klass (maybe variable) | |
| 3166 Node* length, // number of array elements | |
|
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3167 int nargs, // number of arguments to push back for uncommon trap |
| 0 | 3168 Node* *return_size_val) { |
| 3169 jint layout_con = Klass::_lh_neutral_value; | |
| 3170 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
| 3171 int layout_is_con = (layout_val == NULL); | |
| 3172 | |
| 3173 if (!layout_is_con && !StressReflectiveCode && | |
| 3174 !too_many_traps(Deoptimization::Reason_class_check)) { | |
| 3175 // This is a reflective array creation site. | |
| 3176 // Optimistically assume that it is a subtype of Object[], | |
| 3177 // so that we can fold up all the address arithmetic. | |
| 3178 layout_con = Klass::array_layout_helper(T_OBJECT); | |
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3179 Node* cmp_lh = _gvn.transform( new(C) CmpINode(layout_val, intcon(layout_con)) ); |
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3180 Node* bol_lh = _gvn.transform( new(C) BoolNode(cmp_lh, BoolTest::eq) ); |
| 0 | 3181 { BuildCutout unless(this, bol_lh, PROB_MAX); |
|
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|
3182 inc_sp(nargs); |
| 0 | 3183 uncommon_trap(Deoptimization::Reason_class_check, |
| 3184 Deoptimization::Action_maybe_recompile); | |
| 3185 } | |
| 3186 layout_val = NULL; | |
| 3187 layout_is_con = true; | |
| 3188 } | |
| 3189 | |
| 3190 // Generate the initial go-slow test. Make sure we do not overflow | |
| 3191 // if length is huge (near 2Gig) or negative! We do not need | |
| 3192 // exact double-words here, just a close approximation of needed | |
| 3193 // double-words. We can't add any offset or rounding bits, lest we | |
| 3194 // take a size -1 of bytes and make it positive. Use an unsigned | |
| 3195 // compare, so negative sizes look hugely positive. | |
| 3196 int fast_size_limit = FastAllocateSizeLimit; | |
| 3197 if (layout_is_con) { | |
| 3198 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
| 3199 // Increase the size limit if we have exact knowledge of array type. | |
| 3200 int log2_esize = Klass::layout_helper_log2_element_size(layout_con); | |
| 3201 fast_size_limit <<= (LogBytesPerLong - log2_esize); | |
| 3202 } | |
| 3203 | |
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3204 Node* initial_slow_cmp = _gvn.transform( new (C) CmpUNode( length, intcon( fast_size_limit ) ) ); |
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3205 Node* initial_slow_test = _gvn.transform( new (C) BoolNode( initial_slow_cmp, BoolTest::gt ) ); |
| 0 | 3206 if (initial_slow_test->is_Bool()) { |
| 3207 // Hide it behind a CMoveI, or else PhaseIdealLoop::split_up will get sick. | |
| 3208 initial_slow_test = initial_slow_test->as_Bool()->as_int_value(&_gvn); | |
| 3209 } | |
| 3210 | |
| 3211 // --- Size Computation --- | |
| 3212 // array_size = round_to_heap(array_header + (length << elem_shift)); | |
| 3213 // where round_to_heap(x) == round_to(x, MinObjAlignmentInBytes) | |
| 3214 // and round_to(x, y) == ((x + y-1) & ~(y-1)) | |
| 3215 // The rounding mask is strength-reduced, if possible. | |
| 3216 int round_mask = MinObjAlignmentInBytes - 1; | |
| 3217 Node* header_size = NULL; | |
| 3218 int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
| 3219 // (T_BYTE has the weakest alignment and size restrictions...) | |
| 3220 if (layout_is_con) { | |
| 3221 int hsize = Klass::layout_helper_header_size(layout_con); | |
| 3222 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
| 3223 BasicType etype = Klass::layout_helper_element_type(layout_con); | |
| 3224 if ((round_mask & ~right_n_bits(eshift)) == 0) | |
| 3225 round_mask = 0; // strength-reduce it if it goes away completely | |
| 3226 assert((hsize & right_n_bits(eshift)) == 0, "hsize is pre-rounded"); | |
| 3227 assert(header_size_min <= hsize, "generic minimum is smallest"); | |
| 3228 header_size_min = hsize; | |
| 3229 header_size = intcon(hsize + round_mask); | |
| 3230 } else { | |
| 3231 Node* hss = intcon(Klass::_lh_header_size_shift); | |
| 3232 Node* hsm = intcon(Klass::_lh_header_size_mask); | |
|
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3233 Node* hsize = _gvn.transform( new(C) URShiftINode(layout_val, hss) ); |
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3234 hsize = _gvn.transform( new(C) AndINode(hsize, hsm) ); |
| 0 | 3235 Node* mask = intcon(round_mask); |
|
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|
3236 header_size = _gvn.transform( new(C) AddINode(hsize, mask) ); |
| 0 | 3237 } |
| 3238 | |
| 3239 Node* elem_shift = NULL; | |
| 3240 if (layout_is_con) { | |
| 3241 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
| 3242 if (eshift != 0) | |
| 3243 elem_shift = intcon(eshift); | |
| 3244 } else { | |
| 3245 // There is no need to mask or shift this value. | |
| 3246 // The semantics of LShiftINode include an implicit mask to 0x1F. | |
| 3247 assert(Klass::_lh_log2_element_size_shift == 0, "use shift in place"); | |
| 3248 elem_shift = layout_val; | |
| 3249 } | |
| 3250 | |
| 3251 // Transition to native address size for all offset calculations: | |
| 3252 Node* lengthx = ConvI2X(length); | |
| 3253 Node* headerx = ConvI2X(header_size); | |
| 3254 #ifdef _LP64 | |
| 3255 { const TypeLong* tllen = _gvn.find_long_type(lengthx); | |
| 3256 if (tllen != NULL && tllen->_lo < 0) { | |
| 3257 // Add a manual constraint to a positive range. Cf. array_element_address. | |
| 3258 jlong size_max = arrayOopDesc::max_array_length(T_BYTE); | |
| 3259 if (size_max > tllen->_hi) size_max = tllen->_hi; | |
| 3260 const TypeLong* tlcon = TypeLong::make(CONST64(0), size_max, Type::WidenMin); | |
|
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|
3261 lengthx = _gvn.transform( new (C) ConvI2LNode(length, tlcon)); |
| 0 | 3262 } |
| 3263 } | |
| 3264 #endif | |
| 3265 | |
| 3266 // Combine header size (plus rounding) and body size. Then round down. | |
| 3267 // This computation cannot overflow, because it is used only in two | |
| 3268 // places, one where the length is sharply limited, and the other | |
| 3269 // after a successful allocation. | |
| 3270 Node* abody = lengthx; | |
| 3271 if (elem_shift != NULL) | |
|
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3272 abody = _gvn.transform( new(C) LShiftXNode(lengthx, elem_shift) ); |
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3273 Node* size = _gvn.transform( new(C) AddXNode(headerx, abody) ); |
| 0 | 3274 if (round_mask != 0) { |
| 3275 Node* mask = MakeConX(~round_mask); | |
|
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|
3276 size = _gvn.transform( new(C) AndXNode(size, mask) ); |
| 0 | 3277 } |
| 3278 // else if round_mask == 0, the size computation is self-rounding | |
| 3279 | |
| 3280 if (return_size_val != NULL) { | |
| 3281 // This is the size | |
| 3282 (*return_size_val) = size; | |
| 3283 } | |
| 3284 | |
| 3285 // Now generate allocation code | |
|
74
2a9af0b9cb1c
6674600: (Escape Analysis) Optimize memory graph for instance's fields
kvn
parents:
63
diff
changeset
|
3286 |
|
565
7fe62bb75bf4
6799693: Server compiler leads to data corruption when expression throws an Exception
kvn
parents:
563
diff
changeset
|
3287 // The entire memory state is needed for slow path of the allocation |
|
7fe62bb75bf4
6799693: Server compiler leads to data corruption when expression throws an Exception
kvn
parents:
563
diff
changeset
|
3288 // since GC and deoptimization can happened. |
|
7fe62bb75bf4
6799693: Server compiler leads to data corruption when expression throws an Exception
kvn
parents:
563
diff
changeset
|
3289 Node *mem = reset_memory(); |
|
7fe62bb75bf4
6799693: Server compiler leads to data corruption when expression throws an Exception
kvn
parents:
563
diff
changeset
|
3290 set_all_memory(mem); // Create new memory state |
|
74
2a9af0b9cb1c
6674600: (Escape Analysis) Optimize memory graph for instance's fields
kvn
parents:
63
diff
changeset
|
3291 |
| 0 | 3292 // Create the AllocateArrayNode and its result projections |
| 3293 AllocateArrayNode* alloc | |
| 10278 | 3294 = new (C) AllocateArrayNode(C, AllocateArrayNode::alloc_type(TypeInt::INT), |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3295 control(), mem, i_o(), |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3296 size, klass_node, |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3297 initial_slow_test, |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3298 length); |
| 0 | 3299 |
| 3300 // Cast to correct type. Note that the klass_node may be constant or not, | |
| 3301 // and in the latter case the actual array type will be inexact also. | |
| 3302 // (This happens via a non-constant argument to inline_native_newArray.) | |
| 3303 // In any case, the value of klass_node provides the desired array type. | |
| 3304 const TypeInt* length_type = _gvn.find_int_type(length); | |
| 3305 const TypeOopPtr* ary_type = _gvn.type(klass_node)->is_klassptr()->as_instance_type(); | |
| 3306 if (ary_type->isa_aryptr() && length_type != NULL) { | |
| 3307 // Try to get a better type than POS for the size | |
| 3308 ary_type = ary_type->is_aryptr()->cast_to_size(length_type); | |
| 3309 } | |
| 3310 | |
|
3278
66b0e2371912
7026700: regression in 6u24-rev-b23: Crash in C2 compiler in PhaseIdealLoop::build_loop_late_post
kvn
parents:
2468
diff
changeset
|
3311 Node* javaoop = set_output_for_allocation(alloc, ary_type); |
| 0 | 3312 |
|
366
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3313 // Cast length on remaining path to be as narrow as possible |
|
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3314 if (map()->find_edge(length) >= 0) { |
|
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3315 Node* ccast = alloc->make_ideal_length(ary_type, &_gvn); |
|
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3316 if (ccast != length) { |
|
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3317 _gvn.set_type_bottom(ccast); |
|
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3318 record_for_igvn(ccast); |
| 0 | 3319 replace_in_map(length, ccast); |
| 3320 } | |
| 3321 } | |
| 3322 | |
| 3323 return javaoop; | |
| 3324 } | |
| 3325 | |
| 3326 // The following "Ideal_foo" functions are placed here because they recognize | |
| 3327 // the graph shapes created by the functions immediately above. | |
| 3328 | |
| 3329 //---------------------------Ideal_allocation---------------------------------- | |
| 3330 // Given an oop pointer or raw pointer, see if it feeds from an AllocateNode. | |
| 3331 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase) { | |
| 3332 if (ptr == NULL) { // reduce dumb test in callers | |
| 3333 return NULL; | |
| 3334 } | |
| 10278 | 3335 ptr = ptr->uncast(); // strip a raw-to-oop cast |
| 3336 if (ptr == NULL) return NULL; | |
| 3337 | |
| 0 | 3338 if (ptr->is_Proj()) { |
| 3339 Node* allo = ptr->in(0); | |
| 3340 if (allo != NULL && allo->is_Allocate()) { | |
| 3341 return allo->as_Allocate(); | |
| 3342 } | |
| 3343 } | |
| 3344 // Report failure to match. | |
| 3345 return NULL; | |
| 3346 } | |
| 3347 | |
| 3348 // Fancy version which also strips off an offset (and reports it to caller). | |
| 3349 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase, | |
| 3350 intptr_t& offset) { | |
| 3351 Node* base = AddPNode::Ideal_base_and_offset(ptr, phase, offset); | |
| 3352 if (base == NULL) return NULL; | |
| 3353 return Ideal_allocation(base, phase); | |
| 3354 } | |
| 3355 | |
| 3356 // Trace Initialize <- Proj[Parm] <- Allocate | |
| 3357 AllocateNode* InitializeNode::allocation() { | |
| 3358 Node* rawoop = in(InitializeNode::RawAddress); | |
| 3359 if (rawoop->is_Proj()) { | |
| 3360 Node* alloc = rawoop->in(0); | |
| 3361 if (alloc->is_Allocate()) { | |
| 3362 return alloc->as_Allocate(); | |
| 3363 } | |
| 3364 } | |
| 3365 return NULL; | |
| 3366 } | |
| 3367 | |
| 3368 // Trace Allocate -> Proj[Parm] -> Initialize | |
| 3369 InitializeNode* AllocateNode::initialization() { | |
| 3370 ProjNode* rawoop = proj_out(AllocateNode::RawAddress); | |
| 3371 if (rawoop == NULL) return NULL; | |
| 3372 for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) { | |
| 3373 Node* init = rawoop->fast_out(i); | |
| 3374 if (init->is_Initialize()) { | |
| 3375 assert(init->as_Initialize()->allocation() == this, "2-way link"); | |
| 3376 return init->as_Initialize(); | |
| 3377 } | |
| 3378 } | |
| 3379 return NULL; | |
| 3380 } | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3381 |
|
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3382 //----------------------------- loop predicates --------------------------- |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3383 |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3384 //------------------------------add_predicate_impl---------------------------- |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3385 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
|
3386 // Too many traps seen? |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3387 if (too_many_traps(reason)) { |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3388 #ifdef ASSERT |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3389 if (TraceLoopPredicate) { |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3390 int tc = C->trap_count(reason); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3391 tty->print("too many traps=%s tcount=%d in ", |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3392 Deoptimization::trap_reason_name(reason), tc); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3393 method()->print(); // which method has too many predicate traps |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3394 tty->cr(); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3395 } |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3396 #endif |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3397 // We cannot afford to take more traps here, |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3398 // do not generate predicate. |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3399 return; |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3400 } |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3401 |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3402 Node *cont = _gvn.intcon(1); |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3403 Node* opq = _gvn.transform(new (C) Opaque1Node(C, cont)); |
|
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3404 Node *bol = _gvn.transform(new (C) Conv2BNode(opq)); |
|
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3405 IfNode* iff = create_and_map_if(control(), bol, PROB_MAX, COUNT_UNKNOWN); |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3406 Node* iffalse = _gvn.transform(new (C) IfFalseNode(iff)); |
|
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3407 C->add_predicate_opaq(opq); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3408 { |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3409 PreserveJVMState pjvms(this); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3410 set_control(iffalse); |
|
7194
beebba0acc11
7172640: C2: instrinsic implementations in LibraryCallKit should use argument() instead of pop()
twisti
parents:
6846
diff
changeset
|
3411 inc_sp(nargs); |
|
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3412 uncommon_trap(reason, Deoptimization::Action_maybe_recompile); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3413 } |
|
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3414 Node* iftrue = _gvn.transform(new (C) IfTrueNode(iff)); |
|
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3415 set_control(iftrue); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3416 } |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3417 |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3418 //------------------------------add_predicate--------------------------------- |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3419 void GraphKit::add_predicate(int nargs) { |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3420 if (UseLoopPredicate) { |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3421 add_predicate_impl(Deoptimization::Reason_predicate, nargs); |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3422 } |
| 3345 | 3423 // loop's limit check predicate should be near the loop. |
| 3424 if (LoopLimitCheck) { | |
| 3425 add_predicate_impl(Deoptimization::Reason_loop_limit_check, nargs); | |
| 3426 } | |
|
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3427 } |
|
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3428 |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3429 //----------------------------- store barriers ---------------------------- |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3430 #define __ ideal. |
|
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 void GraphKit::sync_kit(IdealKit& ideal) { |
|
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3433 set_all_memory(__ merged_memory()); |
|
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3434 set_i_o(__ i_o()); |
|
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3435 set_control(__ ctrl()); |
|
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3436 } |
|
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3437 |
|
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3438 void GraphKit::final_sync(IdealKit& ideal) { |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3439 // Final sync IdealKit and graphKit. |
|
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3440 sync_kit(ideal); |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3441 } |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3442 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3443 // vanilla/CMS post barrier |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3444 // 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
|
3445 // 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
|
3446 void GraphKit::write_barrier_post(Node* oop_store, |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3447 Node* obj, |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3448 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
|
3449 uint adr_idx, |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3450 Node* val, |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3451 bool use_precise) { |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3452 // 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
|
3453 // (latter case is probably a string constant). The concurrent |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3454 // 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
|
3455 // oop updates flagged via card-marks. |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3456 if (val != NULL && val->is_Con()) { |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3457 // must be either an oop or NULL |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3458 const Type* t = val->bottom_type(); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3459 if (t == TypePtr::NULL_PTR || t == Type::TOP) |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3460 // stores of null never (?) need barriers |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3461 return; |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3462 } |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3463 |
|
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3464 if (use_ReduceInitialCardMarks() |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3465 && obj == just_allocated_object(control())) { |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3466 // We can skip marks on a freshly-allocated object in Eden. |
| 1166 | 3467 // Keep this code in sync with new_store_pre_barrier() in runtime.cpp. |
| 3468 // That routine informs GC to take appropriate compensating steps, | |
| 3469 // upon a slow-path allocation, so as to make this card-mark | |
| 3470 // elision safe. | |
|
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3471 return; |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3472 } |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3473 |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3474 if (!use_precise) { |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3475 // 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
|
3476 adr = obj; |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3477 } |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3478 // (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
|
3479 assert(adr != NULL, ""); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3480 |
|
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3481 IdealKit ideal(this, true); |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3482 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3483 // 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
|
3484 Node* cast = __ CastPX(__ ctrl(), adr); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3485 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3486 // Divide by card size |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3487 assert(Universe::heap()->barrier_set()->kind() == BarrierSet::CardTableModRef, |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3488 "Only one we handle so far."); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3489 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3490 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3491 // Combine card table base and card offset |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3492 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
|
3493 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3494 // Get the alias_index for raw card-mark memory |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3495 int adr_type = Compile::AliasIdxRaw; |
| 3282 | 3496 Node* zero = __ ConI(0); // Dirty card value |
| 3497 BasicType bt = T_BYTE; | |
| 3498 | |
| 3499 if (UseCondCardMark) { | |
| 3500 // The classic GC reference write barrier is typically implemented | |
| 3501 // as a store into the global card mark table. Unfortunately | |
| 3502 // unconditional stores can result in false sharing and excessive | |
| 3503 // coherence traffic as well as false transactional aborts. | |
| 3504 // UseCondCardMark enables MP "polite" conditional card mark | |
| 3505 // stores. In theory we could relax the load from ctrl() to | |
| 3506 // no_ctrl, but that doesn't buy much latitude. | |
| 3507 Node* card_val = __ load( __ ctrl(), card_adr, TypeInt::BYTE, bt, adr_type); | |
| 3508 __ if_then(card_val, BoolTest::ne, zero); | |
| 3509 } | |
| 3510 | |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3511 // Smash zero into card |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3512 if( !UseConcMarkSweepGC ) { |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3513 __ store(__ ctrl(), card_adr, zero, bt, adr_type); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
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|
3514 } else { |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3515 // Specialized path for CM store barrier |
|
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
|
3516 __ storeCM(__ ctrl(), card_adr, zero, oop_store, adr_idx, bt, adr_type); |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3517 } |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3518 |
| 3282 | 3519 if (UseCondCardMark) { |
| 3520 __ end_if(); | |
| 3521 } | |
| 3522 | |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3523 // Final sync IdealKit and GraphKit. |
|
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3524 final_sync(ideal); |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3525 } |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3526 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3527 // G1 pre/post barriers |
|
3249
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3528 void GraphKit::g1_write_barrier_pre(bool do_load, |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3529 Node* obj, |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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113
diff
changeset
|
3530 Node* adr, |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3531 uint alias_idx, |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3532 Node* val, |
| 825 | 3533 const TypeOopPtr* val_type, |
|
3249
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3534 Node* pre_val, |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
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|
3535 BasicType bt) { |
|
3249
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3536 |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3537 // Some sanity checks |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3538 // Note: val is unused in this routine. |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3539 |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3540 if (do_load) { |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3541 // We need to generate the load of the previous value |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3542 assert(obj != NULL, "must have a base"); |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3543 assert(adr != NULL, "where are loading from?"); |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3544 assert(pre_val == NULL, "loaded already?"); |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3545 assert(val_type != NULL, "need a type"); |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3546 } else { |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3547 // In this case both val_type and alias_idx are unused. |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3548 assert(pre_val != NULL, "must be loaded already"); |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3549 assert(pre_val->bottom_type()->basic_type() == T_OBJECT, "or we shouldn't be here"); |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3550 } |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3551 assert(bt == T_OBJECT, "or we shouldn't be here"); |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3552 |
|
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3553 IdealKit ideal(this, true); |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3554 |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3555 Node* tls = __ thread(); // ThreadLocalStorage |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3556 |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3557 Node* no_ctrl = NULL; |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3558 Node* no_base = __ top(); |
|
10185
d50cc62e94ff
8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t
johnc
parents:
8868
diff
changeset
|
3559 Node* zero = __ ConI(0); |
|
d50cc62e94ff
8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t
johnc
parents:
8868
diff
changeset
|
3560 Node* zeroX = __ ConX(0); |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3561 |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3562 float likely = PROB_LIKELY(0.999); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3563 float unlikely = PROB_UNLIKELY(0.999); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3564 |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3565 BasicType active_type = in_bytes(PtrQueue::byte_width_of_active()) == 4 ? T_INT : T_BYTE; |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3566 assert(in_bytes(PtrQueue::byte_width_of_active()) == 4 || in_bytes(PtrQueue::byte_width_of_active()) == 1, "flag width"); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3567 |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3568 // Offsets into the thread |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3569 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 648 |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3570 PtrQueue::byte_offset_of_active()); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3571 const int index_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 656 |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3572 PtrQueue::byte_offset_of_index()); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3573 const int buffer_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 652 |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3574 PtrQueue::byte_offset_of_buf()); |
|
3249
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3575 |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3576 // Now the actual pointers into the thread |
|
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3577 Node* marking_adr = __ AddP(no_base, tls, __ ConX(marking_offset)); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3578 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
|
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3579 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3580 |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3581 // Now some of the values |
|
544
82a980778b92
6793828: G1: invariant: queues are empty when activated
never
parents:
372
diff
changeset
|
3582 Node* marking = __ load(__ ctrl(), marking_adr, TypeInt::INT, active_type, Compile::AliasIdxRaw); |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
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diff
changeset
|
3583 |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3584 // if (!marking) |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3585 __ if_then(marking, BoolTest::ne, zero); { |
|
10185
d50cc62e94ff
8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t
johnc
parents:
8868
diff
changeset
|
3586 BasicType index_bt = TypeX_X->basic_type(); |
|
d50cc62e94ff
8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t
johnc
parents:
8868
diff
changeset
|
3587 assert(sizeof(size_t) == type2aelembytes(index_bt), "Loading G1 PtrQueue::_index with wrong size."); |
|
d50cc62e94ff
8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t
johnc
parents:
8868
diff
changeset
|
3588 Node* index = __ load(__ ctrl(), index_adr, TypeX_X, index_bt, Compile::AliasIdxRaw); |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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113
diff
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|
3589 |
|
3249
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3590 if (do_load) { |
|
342
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6711316: Open source the Garbage-First garbage collector
ysr
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113
diff
changeset
|
3591 // load original value |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3592 // alias_idx correct?? |
|
3249
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3593 pre_val = __ load(no_ctrl, adr, val_type, bt, alias_idx); |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3594 } |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3595 |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3596 // if (pre_val != NULL) |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3597 __ if_then(pre_val, BoolTest::ne, null()); { |
|
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3598 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
|
342
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|
3599 |
|
37f87013dfd8
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ysr
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113
diff
changeset
|
3600 // is the queue for this thread full? |
|
10185
d50cc62e94ff
8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t
johnc
parents:
8868
diff
changeset
|
3601 __ if_then(index, BoolTest::ne, zeroX, likely); { |
|
342
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3602 |
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3603 // decrement the index |
|
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3604 Node* next_index = _gvn.transform(new (C) SubXNode(index, __ ConX(sizeof(intptr_t)))); |
|
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3605 |
|
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3606 // Now get the buffer location we will log the previous value into and store it |
|
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3607 Node *log_addr = __ AddP(no_base, buffer, next_index); |
|
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3608 __ store(__ ctrl(), log_addr, pre_val, T_OBJECT, Compile::AliasIdxRaw); |
|
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3609 // update the index |
|
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3610 __ store(__ ctrl(), index_adr, next_index, index_bt, Compile::AliasIdxRaw); |
|
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3611 |
|
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3612 } __ else_(); { |
|
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3613 |
|
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3614 // logging buffer is full, call the runtime |
|
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3615 const TypeFunc *tf = OptoRuntime::g1_wb_pre_Type(); |
|
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3616 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), "g1_wb_pre", pre_val, tls); |
|
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3617 } __ end_if(); // (!index) |
|
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3618 } __ end_if(); // (pre_val != NULL) |
|
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3619 } __ end_if(); // (!marking) |
|
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3620 |
|
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3621 // Final sync IdealKit and GraphKit. |
|
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3622 final_sync(ideal); |
|
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3623 } |
|
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3624 |
|
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3625 // |
|
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3626 // Update the card table and add card address to the queue |
|
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3627 // |
|
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3628 void GraphKit::g1_mark_card(IdealKit& ideal, |
|
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3629 Node* card_adr, |
|
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|
3630 Node* oop_store, |
|
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|
3631 uint oop_alias_idx, |
|
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3632 Node* index, |
|
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|
3633 Node* index_adr, |
|
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|
3634 Node* buffer, |
|
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|
3635 const TypeFunc* tf) { |
|
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3636 |
|
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|
3637 Node* zero = __ ConI(0); |
|
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3638 Node* zeroX = __ ConX(0); |
|
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3639 Node* no_base = __ top(); |
|
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3640 BasicType card_bt = T_BYTE; |
|
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|
3641 // Smash zero into card. MUST BE ORDERED WRT TO STORE |
|
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3642 __ storeCM(__ ctrl(), card_adr, zero, oop_store, oop_alias_idx, card_bt, Compile::AliasIdxRaw); |
|
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3643 |
|
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3644 // Now do the queue work |
|
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3645 __ if_then(index, BoolTest::ne, zeroX); { |
|
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|
3646 |
|
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|
3647 Node* next_index = _gvn.transform(new (C) SubXNode(index, __ ConX(sizeof(intptr_t)))); |
|
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3648 Node* log_addr = __ AddP(no_base, buffer, next_index); |
|
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3649 |
|
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|
3650 __ store(__ ctrl(), log_addr, card_adr, T_ADDRESS, Compile::AliasIdxRaw); |
|
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|
3651 __ store(__ ctrl(), index_adr, next_index, TypeX_X->basic_type(), Compile::AliasIdxRaw); |
|
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3652 |
|
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|
3653 } __ else_(); { |
|
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|
3654 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), "g1_wb_post", card_adr, __ thread()); |
|
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3655 } __ end_if(); |
|
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|
3656 |
|
342
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|
3657 } |
|
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|
3658 |
|
851
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|
3659 void GraphKit::g1_write_barrier_post(Node* oop_store, |
|
342
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3660 Node* obj, |
|
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|
3661 Node* adr, |
|
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|
3662 uint alias_idx, |
|
37f87013dfd8
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|
3663 Node* val, |
|
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|
3664 BasicType bt, |
|
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|
3665 bool use_precise) { |
|
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|
3666 // If we are writing a NULL then we need no post barrier |
|
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|
3667 |
|
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|
3668 if (val != NULL && val->is_Con() && val->bottom_type() == TypePtr::NULL_PTR) { |
|
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|
3669 // Must be NULL |
|
37f87013dfd8
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|
3670 const Type* t = val->bottom_type(); |
|
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|
3671 assert(t == Type::TOP || t == TypePtr::NULL_PTR, "must be NULL"); |
|
37f87013dfd8
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|
3672 // No post barrier if writing NULLx |
|
37f87013dfd8
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|
3673 return; |
|
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|
3674 } |
|
37f87013dfd8
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|
3675 |
|
37f87013dfd8
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|
3676 if (!use_precise) { |
|
37f87013dfd8
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|
3677 // All card marks for a (non-array) instance are in one place: |
|
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|
3678 adr = obj; |
|
37f87013dfd8
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|
3679 } |
|
37f87013dfd8
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|
3680 // (Else it's an array (or unknown), and we want more precise card marks.) |
|
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|
3681 assert(adr != NULL, ""); |
|
37f87013dfd8
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|
3682 |
|
2444
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|
3683 IdealKit ideal(this, true); |
|
851
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|
3684 |
|
fc4be448891f
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|
3685 Node* tls = __ thread(); // ThreadLocalStorage |
|
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|
3686 |
|
37f87013dfd8
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|
3687 Node* no_base = __ top(); |
|
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|
3688 float likely = PROB_LIKELY(0.999); |
|
37f87013dfd8
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|
3689 float unlikely = PROB_UNLIKELY(0.999); |
|
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|
3690 Node* zero = __ ConI(0); |
|
37f87013dfd8
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|
3691 Node* zeroX = __ ConX(0); |
|
37f87013dfd8
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|
3692 |
|
37f87013dfd8
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|
3693 // Get the alias_index for raw card-mark memory |
|
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|
3694 const TypePtr* card_type = TypeRawPtr::BOTTOM; |
|
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|
3695 |
|
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|
3696 const TypeFunc *tf = OptoRuntime::g1_wb_post_Type(); |
|
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|
3697 |
|
37f87013dfd8
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|
3698 // Offsets into the thread |
|
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|
3699 const int index_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
|
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|
3700 PtrQueue::byte_offset_of_index()); |
|
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|
3701 const int buffer_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
|
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|
3702 PtrQueue::byte_offset_of_buf()); |
|
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|
3703 |
|
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|
3704 // Pointers into the thread |
|
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|
3705 |
|
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|
3706 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
|
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|
3707 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
|
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|
3708 |
|
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|
3709 // Now some values |
|
1593
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|
3710 // Use ctrl to avoid hoisting these values past a safepoint, which could |
|
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|
3711 // potentially reset these fields in the JavaThread. |
|
10185
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|
3712 Node* index = __ load(__ ctrl(), index_adr, TypeX_X, TypeX_X->basic_type(), Compile::AliasIdxRaw); |
|
1593
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|
3713 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
|
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|
3714 |
|
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|
3715 // Convert the store obj pointer to an int prior to doing math on it |
|
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3716 // Must use ctrl to prevent "integerized oop" existing across safepoint |
|
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3717 Node* cast = __ CastPX(__ ctrl(), adr); |
|
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|
3718 |
|
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|
3719 // Divide pointer by card size |
|
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|
3720 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
|
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3721 |
|
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|
3722 // Combine card table base and card offset |
|
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3723 Node* card_adr = __ AddP(no_base, byte_map_base_node(), card_offset ); |
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3724 |
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3725 // If we know the value being stored does it cross regions? |
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3726 |
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3727 if (val != NULL) { |
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3728 // Does the store cause us to cross regions? |
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3729 |
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3730 // Should be able to do an unsigned compare of region_size instead of |
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3731 // and extra shift. Do we have an unsigned compare?? |
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3732 // Node* region_size = __ ConI(1 << HeapRegion::LogOfHRGrainBytes); |
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3733 Node* xor_res = __ URShiftX ( __ XorX( cast, __ CastPX(__ ctrl(), val)), __ ConI(HeapRegion::LogOfHRGrainBytes)); |
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3734 |
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3735 // if (xor_res == 0) same region so skip |
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3736 __ if_then(xor_res, BoolTest::ne, zeroX); { |
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3737 |
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3738 // No barrier if we are storing a NULL |
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3739 __ if_then(val, BoolTest::ne, null(), unlikely); { |
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3740 |
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3741 // Ok must mark the card if not already dirty |
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3742 |
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3743 // load the original value of the card |
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3744 Node* card_val = __ load(__ ctrl(), card_adr, TypeInt::INT, T_BYTE, Compile::AliasIdxRaw); |
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3745 |
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3746 __ if_then(card_val, BoolTest::ne, zero); { |
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3747 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); |
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3748 } __ end_if(); |
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3749 } __ end_if(); |
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3750 } __ end_if(); |
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3751 } else { |
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3752 // Object.clone() instrinsic uses this path. |
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3753 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); |
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3754 } |
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3755 |
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3756 // Final sync IdealKit and GraphKit. |
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3757 final_sync(ideal); |
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3758 } |
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3759 #undef __ |
| 6057 | 3760 |
| 3761 | |
| 3762 | |
| 3763 Node* GraphKit::load_String_offset(Node* ctrl, Node* str) { | |
| 3764 if (java_lang_String::has_offset_field()) { | |
| 3765 int offset_offset = java_lang_String::offset_offset_in_bytes(); | |
| 3766 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
| 3767 false, NULL, 0); | |
| 3768 const TypePtr* offset_field_type = string_type->add_offset(offset_offset); | |
| 3769 int offset_field_idx = C->get_alias_index(offset_field_type); | |
| 3770 return make_load(ctrl, | |
| 3771 basic_plus_adr(str, str, offset_offset), | |
| 3772 TypeInt::INT, T_INT, offset_field_idx); | |
| 3773 } else { | |
| 3774 return intcon(0); | |
| 3775 } | |
| 3776 } | |
| 3777 | |
| 3778 Node* GraphKit::load_String_length(Node* ctrl, Node* str) { | |
| 3779 if (java_lang_String::has_count_field()) { | |
| 3780 int count_offset = java_lang_String::count_offset_in_bytes(); | |
| 3781 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
| 3782 false, NULL, 0); | |
| 3783 const TypePtr* count_field_type = string_type->add_offset(count_offset); | |
| 3784 int count_field_idx = C->get_alias_index(count_field_type); | |
| 3785 return make_load(ctrl, | |
| 3786 basic_plus_adr(str, str, count_offset), | |
| 3787 TypeInt::INT, T_INT, count_field_idx); | |
| 3788 } else { | |
| 3789 return load_array_length(load_String_value(ctrl, str)); | |
| 3790 } | |
| 3791 } | |
| 3792 | |
| 3793 Node* GraphKit::load_String_value(Node* ctrl, Node* str) { | |
| 3794 int value_offset = java_lang_String::value_offset_in_bytes(); | |
| 3795 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
| 3796 false, NULL, 0); | |
| 3797 const TypePtr* value_field_type = string_type->add_offset(value_offset); | |
| 3798 const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull, | |
| 3799 TypeAry::make(TypeInt::CHAR,TypeInt::POS), | |
| 3800 ciTypeArrayKlass::make(T_CHAR), true, 0); | |
| 3801 int value_field_idx = C->get_alias_index(value_field_type); | |
| 3802 return make_load(ctrl, basic_plus_adr(str, str, value_offset), | |
| 3803 value_type, T_OBJECT, value_field_idx); | |
| 3804 } | |
| 3805 | |
| 3806 void GraphKit::store_String_offset(Node* ctrl, Node* str, Node* value) { | |
| 3807 int offset_offset = java_lang_String::offset_offset_in_bytes(); | |
| 3808 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
| 3809 false, NULL, 0); | |
| 3810 const TypePtr* offset_field_type = string_type->add_offset(offset_offset); | |
| 3811 int offset_field_idx = C->get_alias_index(offset_field_type); | |
| 3812 store_to_memory(ctrl, basic_plus_adr(str, offset_offset), | |
| 3813 value, T_INT, offset_field_idx); | |
| 3814 } | |
| 3815 | |
| 3816 void GraphKit::store_String_value(Node* ctrl, Node* str, Node* value) { | |
| 3817 int value_offset = java_lang_String::value_offset_in_bytes(); | |
| 3818 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
| 3819 false, NULL, 0); | |
| 3820 const TypePtr* value_field_type = string_type->add_offset(value_offset); | |
| 3821 const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull, | |
| 3822 TypeAry::make(TypeInt::CHAR,TypeInt::POS), | |
| 3823 ciTypeArrayKlass::make(T_CHAR), true, 0); | |
| 3824 int value_field_idx = C->get_alias_index(value_field_type); | |
| 3825 store_to_memory(ctrl, basic_plus_adr(str, value_offset), | |
| 3826 value, T_OBJECT, value_field_idx); | |
| 3827 } | |
| 3828 | |
| 3829 void GraphKit::store_String_length(Node* ctrl, Node* str, Node* value) { | |
| 3830 int count_offset = java_lang_String::count_offset_in_bytes(); | |
| 3831 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
| 3832 false, NULL, 0); | |
| 3833 const TypePtr* count_field_type = string_type->add_offset(count_offset); | |
| 3834 int count_field_idx = C->get_alias_index(count_field_type); | |
| 3835 store_to_memory(ctrl, basic_plus_adr(str, count_offset), | |
| 3836 value, T_INT, count_field_idx); | |
| 3837 } |