1 /* 2 * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 #include "precompiled.hpp" 25 #include "code/relocInfo.hpp" 26 #include "code/nmethod.hpp" 27 #include "code/icBuffer.hpp" 28 #include "gc/shared/barrierSet.hpp" 29 #include "gc/shared/barrierSetNMethod.hpp" 30 #include "gc/z/zGlobals.hpp" 31 #include "gc/z/zLock.inline.hpp" 32 #include "gc/z/zNMethod.hpp" 33 #include "gc/z/zNMethodData.hpp" 34 #include "gc/z/zNMethodTable.hpp" 35 #include "gc/z/zOopClosures.inline.hpp" 36 #include "gc/z/zTask.hpp" 37 #include "gc/z/zWorkers.hpp" 38 #include "logging/log.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/iterator.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "runtime/atomic.hpp" 43 #include "runtime/orderAccess.hpp" 44 #include "utilities/debug.hpp" 45 46 static ZNMethodData* gc_data(const nmethod* nm) { 47 return nm->gc_data<ZNMethodData>(); 48 } 49 50 static void set_gc_data(nmethod* nm, ZNMethodData* data) { 51 return nm->set_gc_data<ZNMethodData>(data); 52 } 53 54 void ZNMethod::attach_gc_data(nmethod* nm) { 55 GrowableArray<oop*> immediate_oops; 56 bool non_immediate_oops = false; 57 58 // Find all oops relocations 59 RelocIterator iter(nm); 60 while (iter.next()) { 61 if (iter.type() != relocInfo::oop_type) { 62 // Not an oop 63 continue; 64 } 65 66 oop_Relocation* r = iter.oop_reloc(); 67 68 if (!r->oop_is_immediate()) { 69 // Non-immediate oop found 70 non_immediate_oops = true; 71 continue; 72 } 73 74 if (r->oop_value() != NULL) { 75 // Non-NULL immediate oop found. NULL oops can safely be 76 // ignored since the method will be re-registered if they 77 // are later patched to be non-NULL. 78 immediate_oops.push(r->oop_addr()); 79 } 80 } 81 82 // Attach GC data to nmethod 83 ZNMethodData* data = gc_data(nm); 84 if (data == NULL) { 85 data = new ZNMethodData(); 86 set_gc_data(nm, data); 87 } 88 89 // Attach oops in GC data 90 ZNMethodDataOops* const new_oops = ZNMethodDataOops::create(immediate_oops, non_immediate_oops); 91 ZNMethodDataOops* const old_oops = data->swap_oops(new_oops); 92 ZNMethodDataOops::destroy(old_oops); 93 } 94 95 ZReentrantLock* ZNMethod::lock_for_nmethod(nmethod* nm) { 96 return gc_data(nm)->lock(); 97 } 98 99 void ZNMethod::log_register(const nmethod* nm) { 100 LogTarget(Trace, gc, nmethod) log; 101 if (!log.is_enabled()) { 102 return; 103 } 104 105 const ZNMethodDataOops* const oops = gc_data(nm)->oops(); 106 107 log.print("Register NMethod: %s.%s (" PTR_FORMAT "), " 108 "Compiler: %s, Oops: %d, ImmediateOops: " SIZE_FORMAT ", NonImmediateOops: %s", 109 nm->method()->method_holder()->external_name(), 110 nm->method()->name()->as_C_string(), 111 p2i(nm), 112 nm->compiler_name(), 113 nm->oops_count() - 1, 114 oops->immediates_count(), 115 oops->has_non_immediates() ? "Yes" : "No"); 116 117 LogTarget(Trace, gc, nmethod, oops) log_oops; 118 if (!log_oops.is_enabled()) { 119 return; 120 } 121 122 // Print nmethod oops table 123 { 124 oop* const begin = nm->oops_begin(); 125 oop* const end = nm->oops_end(); 126 for (oop* p = begin; p < end; p++) { 127 log_oops.print(" Oop[" SIZE_FORMAT "] " PTR_FORMAT " (%s)", 128 (p - begin), p2i(*p), (*p)->klass()->external_name()); 129 } 130 } 131 132 // Print nmethod immediate oops 133 { 134 oop** const begin = oops->immediates_begin(); 135 oop** const end = oops->immediates_end(); 136 for (oop** p = begin; p < end; p++) { 137 log_oops.print(" ImmediateOop[" SIZE_FORMAT "] " PTR_FORMAT " @ " PTR_FORMAT " (%s)", 138 (p - begin), p2i(**p), p2i(*p), (**p)->klass()->external_name()); 139 } 140 } 141 } 142 143 void ZNMethod::log_unregister(const nmethod* nm) { 144 LogTarget(Debug, gc, nmethod) log; 145 if (!log.is_enabled()) { 146 return; 147 } 148 149 log.print("Unregister NMethod: %s.%s (" PTR_FORMAT ")", 150 nm->method()->method_holder()->external_name(), 151 nm->method()->name()->as_C_string(), 152 p2i(nm)); 153 } 154 155 void ZNMethod::register_nmethod(nmethod* nm) { 156 ResourceMark rm; 157 158 // Create and attach gc data 159 attach_gc_data(nm); 160 161 log_register(nm); 162 163 ZNMethodTable::register_nmethod(nm); 164 165 // Disarm nmethod entry barrier 166 disarm_nmethod(nm); 167 } 168 169 void ZNMethod::unregister_nmethod(nmethod* nm) { 170 assert(CodeCache_lock->owned_by_self(), "Lock must be held"); 171 172 if (Thread::current()->is_Code_cache_sweeper_thread()) { 173 // The sweeper must wait for any ongoing iteration to complete 174 // before it can unregister an nmethod. 175 ZNMethodTable::wait_until_iteration_done(); 176 } 177 178 ResourceMark rm; 179 180 log_unregister(nm); 181 182 ZNMethodTable::unregister_nmethod(nm); 183 } 184 185 void ZNMethod::flush_nmethod(nmethod* nm) { 186 // Destroy GC data 187 delete gc_data(nm); 188 } 189 190 void ZNMethod::disarm_nmethod(nmethod* nm) { 191 BarrierSetNMethod* const bs = BarrierSet::barrier_set()->barrier_set_nmethod(); 192 if (bs != NULL) { 193 bs->disarm(nm); 194 } 195 } 196 197 void ZNMethod::nmethod_oops_do(nmethod* nm, OopClosure* cl) { 198 // Process oops table 199 { 200 oop* const begin = nm->oops_begin(); 201 oop* const end = nm->oops_end(); 202 for (oop* p = begin; p < end; p++) { 203 if (*p != Universe::non_oop_word()) { 204 cl->do_oop(p); 205 } 206 } 207 } 208 209 ZNMethodDataOops* const oops = gc_data(nm)->oops(); 210 211 // Process immediate oops 212 { 213 oop** const begin = oops->immediates_begin(); 214 oop** const end = oops->immediates_end(); 215 for (oop** p = begin; p < end; p++) { 216 if (**p != Universe::non_oop_word()) { 217 cl->do_oop(*p); 218 } 219 } 220 } 221 222 // Process non-immediate oops 223 if (oops->has_non_immediates()) { 224 nm->fix_oop_relocations(); 225 } 226 } 227 228 class ZNMethodToOopsDoClosure : public NMethodClosure { 229 private: 230 OopClosure* _cl; 231 232 public: 233 ZNMethodToOopsDoClosure(OopClosure* cl) : 234 _cl(cl) {} 235 236 virtual void do_nmethod(nmethod* nm) { 237 ZNMethod::nmethod_oops_do(nm, _cl); 238 } 239 }; 240 241 void ZNMethod::oops_do_begin() { 242 ZNMethodTable::nmethods_do_begin(); 243 } 244 245 void ZNMethod::oops_do_end() { 246 ZNMethodTable::nmethods_do_end(); 247 } 248 249 void ZNMethod::oops_do(OopClosure* cl) { 250 ZNMethodToOopsDoClosure nmethod_cl(cl); 251 ZNMethodTable::nmethods_do(&nmethod_cl); 252 } 253 254 class ZNMethodUnlinkClosure : public NMethodClosure { 255 private: 256 bool _unloading_occurred; 257 volatile bool _failed; 258 259 void set_failed() { 260 Atomic::store(true, &_failed); 261 } 262 263 public: 264 ZNMethodUnlinkClosure(bool unloading_occurred) : 265 _unloading_occurred(unloading_occurred), 266 _failed(false) {} 267 268 virtual void do_nmethod(nmethod* nm) { 269 if (failed()) { 270 return; 271 } 272 273 if (!nm->is_alive()) { 274 return; 275 } 276 277 ZLocker<ZReentrantLock> locker(ZNMethod::lock_for_nmethod(nm)); 278 279 if (nm->is_unloading()) { 280 // Unlinking of the dependencies must happen before the 281 // handshake separating unlink and purge. 282 nm->flush_dependencies(false /* delete_immediately */); 283 284 // We don't need to take the lock when unlinking nmethods from 285 // the Method, because it is only concurrently unlinked by 286 // the entry barrier, which acquires the per nmethod lock. 287 nm->unlink_from_method(); 288 return; 289 } 290 291 // Heal oops and disarm 292 ZNMethodOopClosure cl; 293 ZNMethod::nmethod_oops_do(nm, &cl); 294 ZNMethod::disarm_nmethod(nm); 295 296 // Clear compiled ICs and exception caches 297 if (!nm->unload_nmethod_caches(_unloading_occurred)) { 298 set_failed(); 299 } 300 } 301 302 bool failed() const { 303 return Atomic::load(&_failed); 304 } 305 }; 306 307 class ZNMethodUnlinkTask : public ZTask { 308 private: 309 ZNMethodUnlinkClosure _cl; 310 ICRefillVerifier* _verifier; 311 312 public: 313 ZNMethodUnlinkTask(bool unloading_occurred, ICRefillVerifier* verifier) : 314 ZTask("ZNMethodUnlinkTask"), 315 _cl(unloading_occurred), 316 _verifier(verifier) { 317 ZNMethodTable::nmethods_do_begin(); 318 } 319 320 ~ZNMethodUnlinkTask() { 321 ZNMethodTable::nmethods_do_end(); 322 } 323 324 virtual void work() { 325 ICRefillVerifierMark mark(_verifier); 326 ZNMethodTable::nmethods_do(&_cl); 327 } 328 329 bool success() const { 330 return !_cl.failed(); 331 } 332 }; 333 334 void ZNMethod::unlink(ZWorkers* workers, bool unloading_occurred) { 335 for (;;) { 336 ICRefillVerifier verifier; 337 338 { 339 ZNMethodUnlinkTask task(unloading_occurred, &verifier); 340 workers->run_concurrent(&task); 341 if (task.success()) { 342 return; 343 } 344 } 345 346 // Cleaning failed because we ran out of transitional IC stubs, 347 // so we have to refill and try again. Refilling requires taking 348 // a safepoint, so we temporarily leave the suspendible thread set. 349 SuspendibleThreadSetLeaver sts; 350 InlineCacheBuffer::refill_ic_stubs(); 351 } 352 } 353 354 class ZNMethodPurgeClosure : public NMethodClosure { 355 public: 356 virtual void do_nmethod(nmethod* nm) { 357 if (nm->is_alive() && nm->is_unloading()) { 358 nm->make_unloaded(); 359 } 360 } 361 }; 362 363 class ZNMethodPurgeTask : public ZTask { 364 private: 365 ZNMethodPurgeClosure _cl; 366 367 public: 368 ZNMethodPurgeTask() : 369 ZTask("ZNMethodPurgeTask"), 370 _cl() { 371 ZNMethodTable::nmethods_do_begin(); 372 } 373 374 ~ZNMethodPurgeTask() { 375 ZNMethodTable::nmethods_do_end(); 376 } 377 378 virtual void work() { 379 ZNMethodTable::nmethods_do(&_cl); 380 } 381 }; 382 383 void ZNMethod::purge(ZWorkers* workers) { 384 ZNMethodPurgeTask task; 385 workers->run_concurrent(&task); 386 }