1 /* 2 * Copyright (c) 2016, 2018, 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 26 #include "aot/aotCodeHeap.hpp" 27 #include "aot/aotLoader.hpp" 28 #include "aot/compiledIC_aot.hpp" 29 #include "code/codeCache.hpp" 30 #include "code/compiledIC.hpp" 31 #include "code/nativeInst.hpp" 32 #include "compiler/compilerOracle.hpp" 33 #include "gc/shared/cardTableBarrierSet.hpp" 34 #include "gc/shared/collectedHeap.hpp" 35 #include "jvmci/compilerRuntime.hpp" 36 #include "jvmci/jvmciRuntime.hpp" 37 #include "oops/method.inline.hpp" 38 #include "runtime/frame.inline.hpp" 39 #include "runtime/handles.inline.hpp" 40 #include "runtime/java.hpp" 41 #include "runtime/os.hpp" 42 #include "runtime/safepointVerifiers.hpp" 43 #include "runtime/sharedRuntime.hpp" 44 #include "utilities/xmlstream.hpp" 45 46 #include <stdio.h> 47 48 #if 0 49 static void metadata_oops_do(Metadata** metadata_begin, Metadata **metadata_end, OopClosure* f) { 50 // Visit the metadata/oops section 51 for (Metadata** p = metadata_begin; p < metadata_end; p++) { 52 Metadata* m = *p; 53 54 intptr_t meta = (intptr_t)m; 55 if ((meta & 1) == 1) { 56 // already resolved 57 m = (Metadata*)(meta & ~1); 58 } else { 59 continue; 60 } 61 assert(Metaspace::contains(m), ""); 62 if (m->is_method()) { 63 m = ((Method*)m)->method_holder(); 64 } 65 assert(m->is_klass(), "must be"); 66 oop o = ((Klass*)m)->klass_holder(); 67 if (o != NULL) { 68 f->do_oop(&o); 69 } 70 } 71 } 72 #endif 73 74 address* AOTCompiledMethod::orig_pc_addr(const frame* fr) { 75 return (address*) ((address)fr->unextended_sp() + _meta->orig_pc_offset()); 76 } 77 78 bool AOTCompiledMethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) { 79 return false; 80 } 81 82 oop AOTCompiledMethod::oop_at(int index) const { 83 if (index == 0) { // 0 is reserved 84 return NULL; 85 } 86 Metadata** entry = _metadata_got + (index - 1); 87 intptr_t meta = (intptr_t)*entry; 88 if ((meta & 1) == 1) { 89 // already resolved 90 Klass* k = (Klass*)(meta & ~1); 91 return k->java_mirror(); 92 } 93 // The entry is string which we need to resolve. 94 const char* meta_name = _heap->get_name_at((int)meta); 95 int klass_len = build_u2_from((address)meta_name); 96 const char* klass_name = meta_name + 2; 97 // Quick check the current method's holder. 98 Klass* k = _method->method_holder(); 99 100 ResourceMark rm; // for signature_name() 101 if (strncmp(k->signature_name(), klass_name, klass_len) != 0) { // Does not match? 102 // Search klass in got cells in DSO which have this compiled method. 103 k = _heap->get_klass_from_got(klass_name, klass_len, _method); 104 } 105 int method_name_len = build_u2_from((address)klass_name + klass_len); 106 guarantee(method_name_len == 0, "only klass is expected here"); 107 meta = ((intptr_t)k) | 1; 108 *entry = (Metadata*)meta; // Should be atomic on x64 109 return k->java_mirror(); 110 } 111 112 Metadata* AOTCompiledMethod::metadata_at(int index) const { 113 if (index == 0) { // 0 is reserved 114 return NULL; 115 } 116 assert(index - 1 < _metadata_size, ""); 117 { 118 Metadata** entry = _metadata_got + (index - 1); 119 intptr_t meta = (intptr_t)*entry; 120 if ((meta & 1) == 1) { 121 // already resolved 122 Metadata *m = (Metadata*)(meta & ~1); 123 return m; 124 } 125 // The entry is string which we need to resolve. 126 const char* meta_name = _heap->get_name_at((int)meta); 127 int klass_len = build_u2_from((address)meta_name); 128 const char* klass_name = meta_name + 2; 129 // Quick check the current method's holder. 130 Klass* k = _method->method_holder(); 131 bool klass_matched = true; 132 133 ResourceMark rm; // for signature_name() and find_method() 134 if (strncmp(k->signature_name(), klass_name, klass_len) != 0) { // Does not match? 135 // Search klass in got cells in DSO which have this compiled method. 136 k = _heap->get_klass_from_got(klass_name, klass_len, _method); 137 klass_matched = false; 138 } 139 int method_name_len = build_u2_from((address)klass_name + klass_len); 140 if (method_name_len == 0) { // Array or Klass name only? 141 meta = ((intptr_t)k) | 1; 142 *entry = (Metadata*)meta; // Should be atomic on x64 143 return (Metadata*)k; 144 } else { // Method 145 // Quick check the current method's name. 146 Method* m = _method; 147 int signature_len = build_u2_from((address)klass_name + klass_len + 2 + method_name_len); 148 int full_len = 2 + klass_len + 2 + method_name_len + 2 + signature_len; 149 if (!klass_matched || memcmp(_name, meta_name, full_len) != 0) { // Does not match? 150 Thread* thread = Thread::current(); 151 const char* method_name = klass_name + klass_len; 152 m = AOTCodeHeap::find_method(k, thread, method_name); 153 } 154 meta = ((intptr_t)m) | 1; 155 *entry = (Metadata*)meta; // Should be atomic on x64 156 return (Metadata*)m; 157 } 158 } 159 ShouldNotReachHere(); return NULL; 160 } 161 162 bool AOTCompiledMethod::make_not_entrant_helper(int new_state) { 163 // Make sure the method is not flushed in case of a safepoint in code below. 164 methodHandle the_method(method()); 165 NoSafepointVerifier nsv; 166 167 { 168 // Enter critical section. Does not block for safepoint. 169 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 170 171 if (*_state_adr == new_state) { 172 // another thread already performed this transition so nothing 173 // to do, but return false to indicate this. 174 return false; 175 } 176 177 // Change state 178 OrderAccess::storestore(); 179 *_state_adr = new_state; 180 181 // Log the transition once 182 log_state_change(); 183 184 #ifdef TIERED 185 // Remain non-entrant forever 186 if (new_state == not_entrant && method() != NULL) { 187 method()->set_aot_code(NULL); 188 } 189 #endif 190 191 // Remove AOTCompiledMethod from method. 192 if (method() != NULL && (method()->code() == this || 193 method()->from_compiled_entry() == verified_entry_point())) { 194 HandleMark hm; 195 method()->clear_code(false /* already owns Patching_lock */); 196 } 197 } // leave critical region under Patching_lock 198 199 200 if (TraceCreateZombies) { 201 ResourceMark m; 202 const char *new_state_str = (new_state == not_entrant) ? "not entrant" : "not used"; 203 tty->print_cr("aot method <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", new_state_str); 204 } 205 206 return true; 207 } 208 209 bool AOTCompiledMethod::make_entrant() { 210 assert(!method()->is_old(), "reviving evolved method!"); 211 assert(*_state_adr != not_entrant, "%s", method()->has_aot_code() ? "has_aot_code() not cleared" : "caller didn't check has_aot_code()"); 212 213 // Make sure the method is not flushed in case of a safepoint in code below. 214 methodHandle the_method(method()); 215 NoSafepointVerifier nsv; 216 217 { 218 // Enter critical section. Does not block for safepoint. 219 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 220 221 if (*_state_adr == in_use) { 222 // another thread already performed this transition so nothing 223 // to do, but return false to indicate this. 224 return false; 225 } 226 227 // Change state 228 OrderAccess::storestore(); 229 *_state_adr = in_use; 230 231 // Log the transition once 232 log_state_change(); 233 } // leave critical region under Patching_lock 234 235 236 if (TraceCreateZombies) { 237 ResourceMark m; 238 tty->print_cr("aot method <" INTPTR_FORMAT "> %s code made entrant", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null"); 239 } 240 241 return true; 242 } 243 244 // We don't have full dependencies for AOT methods, so flushing is 245 // more conservative than for nmethods. 246 void AOTCompiledMethod::flush_evol_dependents_on(InstanceKlass* dependee) { 247 if (is_java_method()) { 248 cleanup_inline_caches(); 249 mark_for_deoptimization(); 250 make_not_entrant(); 251 } 252 } 253 254 // Iterate over metadata calling this function. Used by RedefineClasses 255 // Copied from nmethod::metadata_do 256 void AOTCompiledMethod::metadata_do(void f(Metadata*)) { 257 address low_boundary = verified_entry_point(); 258 { 259 // Visit all immediate references that are embedded in the instruction stream. 260 RelocIterator iter(this, low_boundary); 261 while (iter.next()) { 262 if (iter.type() == relocInfo::metadata_type ) { 263 metadata_Relocation* r = iter.metadata_reloc(); 264 // In this metadata, we must only follow those metadatas directly embedded in 265 // the code. Other metadatas (oop_index>0) are seen as part of 266 // the metadata section below. 267 assert(1 == (r->metadata_is_immediate()) + 268 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 269 "metadata must be found in exactly one place"); 270 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 271 Metadata* md = r->metadata_value(); 272 if (md != _method) f(md); 273 } 274 } else if (iter.type() == relocInfo::virtual_call_type) { 275 // Check compiledIC holders associated with this nmethod 276 CompiledIC *ic = CompiledIC_at(&iter); 277 if (ic->is_icholder_call()) { 278 CompiledICHolder* cichk = ic->cached_icholder(); 279 f(cichk->holder_metadata()); 280 f(cichk->holder_klass()); 281 } else { 282 // Get Klass* or NULL (if value is -1) from GOT cell of virtual call PLT stub. 283 Metadata* ic_oop = ic->cached_metadata(); 284 if (ic_oop != NULL) { 285 f(ic_oop); 286 } 287 } 288 } else if (iter.type() == relocInfo::static_call_type || 289 iter.type() == relocInfo::opt_virtual_call_type){ 290 // Check Method* in AOT c2i stub for other calls. 291 Metadata* meta = (Metadata*)nativeLoadGot_at(nativePltCall_at(iter.addr())->plt_c2i_stub())->data(); 292 if (meta != NULL) { 293 f(meta); 294 } 295 } 296 } 297 } 298 299 // Visit the metadata section 300 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 301 Metadata* m = *p; 302 303 intptr_t meta = (intptr_t)m; 304 if ((meta & 1) == 1) { 305 // already resolved 306 m = (Metadata*)(meta & ~1); 307 } else { 308 continue; 309 } 310 assert(Metaspace::contains(m), ""); 311 f(m); 312 } 313 314 // Visit metadata not embedded in the other places. 315 if (_method != NULL) f(_method); 316 } 317 318 void AOTCompiledMethod::print() const { 319 print_on(tty, "AOTCompiledMethod"); 320 } 321 322 void AOTCompiledMethod::print_on(outputStream* st) const { 323 print_on(st, "AOTCompiledMethod"); 324 } 325 326 // Print out more verbose output usually for a newly created aot method. 327 void AOTCompiledMethod::print_on(outputStream* st, const char* msg) const { 328 if (st != NULL) { 329 ttyLocker ttyl; 330 st->print("%7d ", (int) st->time_stamp().milliseconds()); 331 st->print("%4d ", _aot_id); // print compilation number 332 st->print(" aot[%2d]", _heap->dso_id()); 333 // Stubs have _method == NULL 334 if (_method == NULL) { 335 st->print(" %s", _name); 336 } else { 337 ResourceMark m; 338 st->print(" %s", _method->name_and_sig_as_C_string()); 339 } 340 if (Verbose) { 341 st->print(" entry at " INTPTR_FORMAT, p2i(_code)); 342 } 343 if (msg != NULL) { 344 st->print(" %s", msg); 345 } 346 st->cr(); 347 } 348 } 349 350 void AOTCompiledMethod::print_value_on(outputStream* st) const { 351 st->print("AOTCompiledMethod "); 352 print_on(st, NULL); 353 } 354 355 // Print a short set of xml attributes to identify this aot method. The 356 // output should be embedded in some other element. 357 void AOTCompiledMethod::log_identity(xmlStream* log) const { 358 log->print(" aot_id='%d'", _aot_id); 359 log->print(" aot='%2d'", _heap->dso_id()); 360 } 361 362 void AOTCompiledMethod::log_state_change() const { 363 if (LogCompilation) { 364 ResourceMark m; 365 if (xtty != NULL) { 366 ttyLocker ttyl; // keep the following output all in one block 367 if (*_state_adr == not_entrant) { 368 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'", 369 os::current_thread_id()); 370 } else if (*_state_adr == not_used) { 371 xtty->begin_elem("make_not_used thread='" UINTX_FORMAT "'", 372 os::current_thread_id()); 373 } else if (*_state_adr == in_use) { 374 xtty->begin_elem("make_entrant thread='" UINTX_FORMAT "'", 375 os::current_thread_id()); 376 } 377 log_identity(xtty); 378 xtty->stamp(); 379 xtty->end_elem(); 380 } 381 } 382 if (PrintCompilation) { 383 ResourceMark m; 384 if (*_state_adr == not_entrant) { 385 print_on(tty, "made not entrant"); 386 } else if (*_state_adr == not_used) { 387 print_on(tty, "made not used"); 388 } else if (*_state_adr == in_use) { 389 print_on(tty, "made entrant"); 390 } 391 } 392 } 393 394 395 NativeInstruction* PltNativeCallWrapper::get_load_instruction(virtual_call_Relocation* r) const { 396 return nativeLoadGot_at(_call->plt_load_got()); 397 } 398 399 void PltNativeCallWrapper::verify_resolve_call(address dest) const { 400 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 401 if (db == NULL) { 402 assert(dest == _call->plt_resolve_call(), "sanity"); 403 } 404 } 405 406 void PltNativeCallWrapper::set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 407 assert(!info.to_aot(), "only for nmethod"); 408 CompiledPltStaticCall* csc = CompiledPltStaticCall::at(instruction_address()); 409 csc->set_to_interpreted(method, info.entry()); 410 } 411 412 NativeCallWrapper* AOTCompiledMethod::call_wrapper_at(address call) const { 413 return new PltNativeCallWrapper((NativePltCall*) call); 414 } 415 416 NativeCallWrapper* AOTCompiledMethod::call_wrapper_before(address return_pc) const { 417 return new PltNativeCallWrapper(nativePltCall_before(return_pc)); 418 } 419 420 CompiledStaticCall* AOTCompiledMethod::compiledStaticCall_at(Relocation* call_site) const { 421 return CompiledPltStaticCall::at(call_site); 422 } 423 424 CompiledStaticCall* AOTCompiledMethod::compiledStaticCall_at(address call_site) const { 425 return CompiledPltStaticCall::at(call_site); 426 } 427 428 CompiledStaticCall* AOTCompiledMethod::compiledStaticCall_before(address return_addr) const { 429 return CompiledPltStaticCall::before(return_addr); 430 } 431 432 address AOTCompiledMethod::call_instruction_address(address pc) const { 433 NativePltCall* pltcall = nativePltCall_before(pc); 434 return pltcall->instruction_address(); 435 } 436 437 bool AOTCompiledMethod::is_evol_dependent_on(Klass* dependee) { 438 return !is_aot_runtime_stub() && _heap->is_dependent_method(dependee, this); 439 } 440 441 void AOTCompiledMethod::clear_inline_caches() { 442 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 443 if (is_zombie()) { 444 return; 445 } 446 447 RelocIterator iter(this); 448 while (iter.next()) { 449 iter.reloc()->clear_inline_cache(); 450 if (iter.type() == relocInfo::opt_virtual_call_type) { 451 CompiledIC* cic = CompiledIC_at(&iter); 452 assert(cic->is_clean(), "!"); 453 nativePltCall_at(iter.addr())->set_stub_to_clean(); 454 } 455 } 456 }