1 /* 2 * Copyright (c) 2016, 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 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 "oops/method.inline.hpp" 36 #include "runtime/frame.inline.hpp" 37 #include "runtime/handles.inline.hpp" 38 #include "runtime/java.hpp" 39 #include "runtime/os.hpp" 40 #include "runtime/safepointVerifiers.hpp" 41 #include "runtime/sharedRuntime.hpp" 42 #include "utilities/sizes.hpp" 43 #include "utilities/xmlstream.hpp" 44 45 #include <stdio.h> 46 47 #if 0 48 static void metadata_oops_do(Metadata** metadata_begin, Metadata **metadata_end, OopClosure* f) { 49 // Visit the metadata/oops section 50 for (Metadata** p = metadata_begin; p < metadata_end; p++) { 51 Metadata* m = *p; 52 53 intptr_t meta = (intptr_t)m; 54 if ((meta & 1) == 1) { 55 // already resolved 56 m = (Metadata*)(meta & ~1); 57 } else { 58 continue; 59 } 60 assert(Metaspace::contains(m), ""); 61 if (m->is_method()) { 62 m = ((Method*)m)->method_holder(); 63 } 64 assert(m->is_klass(), "must be"); 65 oop o = ((Klass*)m)->klass_holder(); 66 if (o != NULL) { 67 f->do_oop(&o); 68 } 69 } 70 } 71 #endif 72 73 address* AOTCompiledMethod::orig_pc_addr(const frame* fr) { 74 return (address*) ((address)fr->unextended_sp() + _meta->orig_pc_offset()); 75 } 76 77 oop AOTCompiledMethod::oop_at(int index) const { 78 if (index == 0) { // 0 is reserved 79 return NULL; 80 } 81 Metadata** entry = _metadata_got + (index - 1); 82 intptr_t meta = (intptr_t)*entry; 83 if ((meta & 1) == 1) { 84 // already resolved 85 Klass* k = (Klass*)(meta & ~1); 86 return k->java_mirror(); 87 } 88 // The entry is string which we need to resolve. 89 const char* meta_name = _heap->get_name_at((int)meta); 90 int klass_len = Bytes::get_Java_u2((address)meta_name); 91 const char* klass_name = meta_name + 2; 92 // Quick check the current method's holder. 93 Klass* k = _method->method_holder(); 94 95 ResourceMark rm; // for signature_name() 96 if (strncmp(k->signature_name(), klass_name, klass_len) != 0) { // Does not match? 97 // Search klass in got cells in DSO which have this compiled method. 98 k = _heap->get_klass_from_got(klass_name, klass_len, _method); 99 } 100 int method_name_len = Bytes::get_Java_u2((address)klass_name + klass_len); 101 guarantee(method_name_len == 0, "only klass is expected here"); 102 meta = ((intptr_t)k) | 1; 103 *entry = (Metadata*)meta; // Should be atomic on x64 104 return k->java_mirror(); 105 } 106 107 Metadata* AOTCompiledMethod::metadata_at(int index) const { 108 if (index == 0) { // 0 is reserved 109 return NULL; 110 } 111 assert(index - 1 < _metadata_size, ""); 112 { 113 Metadata** entry = _metadata_got + (index - 1); 114 intptr_t meta = (intptr_t)*entry; 115 if ((meta & 1) == 1) { 116 // already resolved 117 Metadata *m = (Metadata*)(meta & ~1); 118 return m; 119 } 120 // The entry is string which we need to resolve. 121 const char* meta_name = _heap->get_name_at((int)meta); 122 int klass_len = Bytes::get_Java_u2((address)meta_name); 123 const char* klass_name = meta_name + 2; 124 // Quick check the current method's holder. 125 Klass* k = _method->method_holder(); 126 bool klass_matched = true; 127 128 ResourceMark rm; // for signature_name() and find_method() 129 if (strncmp(k->signature_name(), klass_name, klass_len) != 0) { // Does not match? 130 // Search klass in got cells in DSO which have this compiled method. 131 k = _heap->get_klass_from_got(klass_name, klass_len, _method); 132 klass_matched = false; 133 } 134 int method_name_len = Bytes::get_Java_u2((address)klass_name + klass_len); 135 if (method_name_len == 0) { // Array or Klass name only? 136 meta = ((intptr_t)k) | 1; 137 *entry = (Metadata*)meta; // Should be atomic on x64 138 return (Metadata*)k; 139 } else { // Method 140 // Quick check the current method's name. 141 Method* m = _method; 142 int signature_len = Bytes::get_Java_u2((address)klass_name + klass_len + 2 + method_name_len); 143 int full_len = 2 + klass_len + 2 + method_name_len + 2 + signature_len; 144 if (!klass_matched || memcmp(_name, meta_name, full_len) != 0) { // Does not match? 145 Thread* thread = Thread::current(); 146 const char* method_name = klass_name + klass_len; 147 m = AOTCodeHeap::find_method(k, thread, method_name); 148 } 149 meta = ((intptr_t)m) | 1; 150 *entry = (Metadata*)meta; // Should be atomic on x64 151 return (Metadata*)m; 152 } 153 } 154 ShouldNotReachHere(); return NULL; 155 } 156 157 void AOTCompiledMethod::do_unloading(bool unloading_occurred) { 158 unload_nmethod_caches(unloading_occurred); 159 } 160 161 bool AOTCompiledMethod::make_not_entrant_helper(int new_state) { 162 // Make sure the method is not flushed in case of a safepoint in code below. 163 methodHandle the_method(method()); 164 NoSafepointVerifier nsv; 165 166 { 167 // Enter critical section. Does not block for safepoint. 168 MutexLocker pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 169 170 if (*_state_adr == new_state) { 171 // another thread already performed this transition so nothing 172 // to do, but return false to indicate this. 173 return false; 174 } 175 176 // Change state 177 OrderAccess::storestore(); 178 *_state_adr = new_state; 179 180 // Log the transition once 181 log_state_change(); 182 183 #ifdef TIERED 184 // Remain non-entrant forever 185 if (new_state == not_entrant && method() != NULL) { 186 method()->set_aot_code(NULL); 187 } 188 #endif 189 190 // Remove AOTCompiledMethod from method. 191 if (method() != NULL) { 192 method()->unlink_code(this); 193 } 194 } // leave critical region under CompiledMethod_lock 195 196 197 if (TraceCreateZombies) { 198 ResourceMark m; 199 const char *new_state_str = (new_state == not_entrant) ? "not entrant" : "not used"; 200 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); 201 } 202 203 return true; 204 } 205 206 #ifdef TIERED 207 bool AOTCompiledMethod::make_entrant() { 208 assert(!method()->is_old(), "reviving evolved method!"); 209 210 // Make sure the method is not flushed in case of a safepoint in code below. 211 methodHandle the_method(method()); 212 NoSafepointVerifier nsv; 213 214 { 215 // Enter critical section. Does not block for safepoint. 216 MutexLocker pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 217 218 if (*_state_adr == in_use || *_state_adr == not_entrant) { 219 // another thread already performed this transition so nothing 220 // to do, but return false to indicate this. 221 return false; 222 } 223 224 // Change state 225 OrderAccess::storestore(); 226 *_state_adr = in_use; 227 228 // Log the transition once 229 log_state_change(); 230 } // leave critical region under CompiledMethod_lock 231 232 233 if (TraceCreateZombies) { 234 ResourceMark m; 235 tty->print_cr("aot method <" INTPTR_FORMAT "> %s code made entrant", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null"); 236 } 237 238 return true; 239 } 240 #endif // TIERED 241 242 // Iterate over metadata calling this function. Used by RedefineClasses 243 // Copied from nmethod::metadata_do 244 void AOTCompiledMethod::metadata_do(MetadataClosure* f) { 245 address low_boundary = verified_entry_point(); 246 { 247 // Visit all immediate references that are embedded in the instruction stream. 248 RelocIterator iter(this, low_boundary); 249 while (iter.next()) { 250 if (iter.type() == relocInfo::metadata_type ) { 251 metadata_Relocation* r = iter.metadata_reloc(); 252 // In this metadata, we must only follow those metadatas directly embedded in 253 // the code. Other metadatas (oop_index>0) are seen as part of 254 // the metadata section below. 255 assert(1 == (r->metadata_is_immediate()) + 256 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 257 "metadata must be found in exactly one place"); 258 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 259 Metadata* md = r->metadata_value(); 260 if (md != _method) f->do_metadata(md); 261 } 262 } else if (iter.type() == relocInfo::virtual_call_type) { 263 ResourceMark rm; 264 // Check compiledIC holders associated with this nmethod 265 CompiledIC *ic = CompiledIC_at(&iter); 266 if (ic->is_icholder_call()) { 267 CompiledICHolder* cichk = ic->cached_icholder(); 268 f->do_metadata(cichk->holder_metadata()); 269 f->do_metadata(cichk->holder_klass()); 270 } else { 271 // Get Klass* or NULL (if value is -1) from GOT cell of virtual call PLT stub. 272 Metadata* ic_oop = ic->cached_metadata(); 273 if (ic_oop != NULL) { 274 f->do_metadata(ic_oop); 275 } 276 } 277 } else if (iter.type() == relocInfo::static_call_type || 278 iter.type() == relocInfo::opt_virtual_call_type) { 279 // Check Method* in AOT c2i stub for other calls. 280 Metadata* meta = (Metadata*)nativeLoadGot_at(nativePltCall_at(iter.addr())->plt_c2i_stub())->data(); 281 if (meta != NULL) { 282 f->do_metadata(meta); 283 } 284 } 285 } 286 } 287 288 // Visit the metadata section 289 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 290 Metadata* m = *p; 291 292 intptr_t meta = (intptr_t)m; 293 if ((meta & 1) == 1) { 294 // already resolved 295 m = (Metadata*)(meta & ~1); 296 } else { 297 continue; 298 } 299 assert(Metaspace::contains(m), ""); 300 f->do_metadata(m); 301 } 302 303 // Visit metadata not embedded in the other places. 304 if (_method != NULL) f->do_metadata(_method); 305 } 306 307 void AOTCompiledMethod::print() const { 308 print_on(tty, "AOTCompiledMethod"); 309 } 310 311 void AOTCompiledMethod::print_on(outputStream* st) const { 312 print_on(st, "AOTCompiledMethod"); 313 } 314 315 // Print out more verbose output usually for a newly created aot method. 316 void AOTCompiledMethod::print_on(outputStream* st, const char* msg) const { 317 if (st != NULL) { 318 ttyLocker ttyl; 319 st->print("%7d ", (int) st->time_stamp().milliseconds()); 320 st->print("%4d ", _aot_id); // print compilation number 321 st->print(" aot[%2d]", _heap->dso_id()); 322 // Stubs have _method == NULL 323 if (_method == NULL) { 324 st->print(" %s", _name); 325 } else { 326 ResourceMark m; 327 st->print(" %s", _method->name_and_sig_as_C_string()); 328 } 329 if (Verbose) { 330 st->print(" entry at " INTPTR_FORMAT, p2i(_code)); 331 } 332 if (msg != NULL) { 333 st->print(" %s", msg); 334 } 335 st->cr(); 336 } 337 } 338 339 void AOTCompiledMethod::print_value_on(outputStream* st) const { 340 st->print("AOTCompiledMethod "); 341 print_on(st, NULL); 342 } 343 344 // Print a short set of xml attributes to identify this aot method. The 345 // output should be embedded in some other element. 346 void AOTCompiledMethod::log_identity(xmlStream* log) const { 347 log->print(" aot_id='%d'", _aot_id); 348 log->print(" aot='%2d'", _heap->dso_id()); 349 } 350 351 void AOTCompiledMethod::log_state_change() const { 352 if (LogCompilation) { 353 ResourceMark m; 354 if (xtty != NULL) { 355 ttyLocker ttyl; // keep the following output all in one block 356 if (*_state_adr == not_entrant) { 357 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'", 358 os::current_thread_id()); 359 } else if (*_state_adr == not_used) { 360 xtty->begin_elem("make_not_used thread='" UINTX_FORMAT "'", 361 os::current_thread_id()); 362 } else if (*_state_adr == in_use) { 363 xtty->begin_elem("make_entrant thread='" UINTX_FORMAT "'", 364 os::current_thread_id()); 365 } 366 log_identity(xtty); 367 xtty->stamp(); 368 xtty->end_elem(); 369 } 370 } 371 if (PrintCompilation) { 372 ResourceMark m; 373 if (*_state_adr == not_entrant) { 374 print_on(tty, "made not entrant"); 375 } else if (*_state_adr == not_used) { 376 print_on(tty, "made not used"); 377 } else if (*_state_adr == in_use) { 378 print_on(tty, "made entrant"); 379 } 380 } 381 } 382 383 384 NativeInstruction* PltNativeCallWrapper::get_load_instruction(virtual_call_Relocation* r) const { 385 return nativeLoadGot_at(_call->plt_load_got()); 386 } 387 388 void PltNativeCallWrapper::verify_resolve_call(address dest) const { 389 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 390 if (db == NULL) { 391 assert(dest == _call->plt_resolve_call(), "sanity"); 392 } 393 } 394 395 void PltNativeCallWrapper::set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 396 assert(!info.to_aot(), "only for nmethod"); 397 CompiledPltStaticCall* csc = CompiledPltStaticCall::at(instruction_address()); 398 csc->set_to_interpreted(method, info.entry()); 399 } 400 401 NativeCallWrapper* AOTCompiledMethod::call_wrapper_at(address call) const { 402 return new PltNativeCallWrapper((NativePltCall*) call); 403 } 404 405 NativeCallWrapper* AOTCompiledMethod::call_wrapper_before(address return_pc) const { 406 return new PltNativeCallWrapper(nativePltCall_before(return_pc)); 407 } 408 409 CompiledStaticCall* AOTCompiledMethod::compiledStaticCall_at(Relocation* call_site) const { 410 return CompiledPltStaticCall::at(call_site); 411 } 412 413 CompiledStaticCall* AOTCompiledMethod::compiledStaticCall_at(address call_site) const { 414 return CompiledPltStaticCall::at(call_site); 415 } 416 417 CompiledStaticCall* AOTCompiledMethod::compiledStaticCall_before(address return_addr) const { 418 return CompiledPltStaticCall::before(return_addr); 419 } 420 421 address AOTCompiledMethod::call_instruction_address(address pc) const { 422 NativePltCall* pltcall = nativePltCall_before(pc); 423 return pltcall->instruction_address(); 424 } 425 426 void AOTCompiledMethod::clear_inline_caches() { 427 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 428 if (is_zombie()) { 429 return; 430 } 431 432 ResourceMark rm; 433 RelocIterator iter(this); 434 while (iter.next()) { 435 iter.reloc()->clear_inline_cache(); 436 if (iter.type() == relocInfo::opt_virtual_call_type) { 437 CompiledIC* cic = CompiledIC_at(&iter); 438 assert(cic->is_clean(), "!"); 439 nativePltCall_at(iter.addr())->set_stub_to_clean(); 440 } 441 } 442 }