1 /* 2 * Copyright (c) 1997, 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 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaClasses.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/icBuffer.hpp" 31 #include "code/vtableStubs.hpp" 32 #include "gc_implementation/shared/vmGCOperations.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "memory/allocation.inline.hpp" 35 #ifdef ASSERT 36 #include "memory/guardedMemory.hpp" 37 #endif 38 #include "oops/oop.inline.hpp" 39 #include "prims/jvm.h" 40 #include "prims/jvm_misc.hpp" 41 #include "prims/privilegedStack.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/frame.inline.hpp" 44 #include "runtime/interfaceSupport.hpp" 45 #include "runtime/java.hpp" 46 #include "runtime/javaCalls.hpp" 47 #include "runtime/mutexLocker.hpp" 48 #include "runtime/os.hpp" 49 #include "runtime/stubRoutines.hpp" 50 #include "runtime/thread.inline.hpp" 51 #include "services/attachListener.hpp" 52 #include "services/nmtCommon.hpp" 53 #include "services/mallocTracker.hpp" 54 #include "services/memTracker.hpp" 55 #include "services/threadService.hpp" 56 #include "utilities/defaultStream.hpp" 57 #include "utilities/events.hpp" 58 #ifdef TARGET_OS_FAMILY_linux 59 # include "os_linux.inline.hpp" 60 #endif 61 #ifdef TARGET_OS_FAMILY_solaris 62 # include "os_solaris.inline.hpp" 63 #endif 64 #ifdef TARGET_OS_FAMILY_windows 65 # include "os_windows.inline.hpp" 66 #endif 67 #ifdef TARGET_OS_FAMILY_bsd 68 # include "os_bsd.inline.hpp" 69 #endif 70 71 # include <signal.h> 72 73 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 74 75 OSThread* os::_starting_thread = NULL; 76 address os::_polling_page = NULL; 77 volatile int32_t* os::_mem_serialize_page = NULL; 78 uintptr_t os::_serialize_page_mask = 0; 79 long os::_rand_seed = 1; 80 int os::_processor_count = 0; 81 int os::_initial_active_processor_count = 0; 82 size_t os::_page_sizes[os::page_sizes_max]; 83 84 #ifndef PRODUCT 85 julong os::num_mallocs = 0; // # of calls to malloc/realloc 86 julong os::alloc_bytes = 0; // # of bytes allocated 87 julong os::num_frees = 0; // # of calls to free 88 julong os::free_bytes = 0; // # of bytes freed 89 #endif 90 91 static juint cur_malloc_words = 0; // current size for MallocMaxTestWords 92 93 void os_init_globals() { 94 // Called from init_globals(). 95 // See Threads::create_vm() in thread.cpp, and init.cpp. 96 os::init_globals(); 97 } 98 99 // Fill in buffer with current local time as an ISO-8601 string. 100 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. 101 // Returns buffer, or NULL if it failed. 102 // This would mostly be a call to 103 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) 104 // except that on Windows the %z behaves badly, so we do it ourselves. 105 // Also, people wanted milliseconds on there, 106 // and strftime doesn't do milliseconds. 107 char* os::iso8601_time(char* buffer, size_t buffer_length) { 108 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" 109 // 1 2 110 // 12345678901234567890123456789 111 static const char* iso8601_format = 112 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d"; 113 static const size_t needed_buffer = 29; 114 115 // Sanity check the arguments 116 if (buffer == NULL) { 117 assert(false, "NULL buffer"); 118 return NULL; 119 } 120 if (buffer_length < needed_buffer) { 121 assert(false, "buffer_length too small"); 122 return NULL; 123 } 124 // Get the current time 125 jlong milliseconds_since_19700101 = javaTimeMillis(); 126 const int milliseconds_per_microsecond = 1000; 127 const time_t seconds_since_19700101 = 128 milliseconds_since_19700101 / milliseconds_per_microsecond; 129 const int milliseconds_after_second = 130 milliseconds_since_19700101 % milliseconds_per_microsecond; 131 // Convert the time value to a tm and timezone variable 132 struct tm time_struct; 133 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { 134 assert(false, "Failed localtime_pd"); 135 return NULL; 136 } 137 #if defined(_ALLBSD_SOURCE) 138 const time_t zone = (time_t) time_struct.tm_gmtoff; 139 #else 140 const time_t zone = timezone; 141 #endif 142 143 // If daylight savings time is in effect, 144 // we are 1 hour East of our time zone 145 const time_t seconds_per_minute = 60; 146 const time_t minutes_per_hour = 60; 147 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; 148 time_t UTC_to_local = zone; 149 if (time_struct.tm_isdst > 0) { 150 UTC_to_local = UTC_to_local - seconds_per_hour; 151 } 152 // Compute the time zone offset. 153 // localtime_pd() sets timezone to the difference (in seconds) 154 // between UTC and and local time. 155 // ISO 8601 says we need the difference between local time and UTC, 156 // we change the sign of the localtime_pd() result. 157 const time_t local_to_UTC = -(UTC_to_local); 158 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. 159 char sign_local_to_UTC = '+'; 160 time_t abs_local_to_UTC = local_to_UTC; 161 if (local_to_UTC < 0) { 162 sign_local_to_UTC = '-'; 163 abs_local_to_UTC = -(abs_local_to_UTC); 164 } 165 // Convert time zone offset seconds to hours and minutes. 166 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); 167 const time_t zone_min = 168 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); 169 170 // Print an ISO 8601 date and time stamp into the buffer 171 const int year = 1900 + time_struct.tm_year; 172 const int month = 1 + time_struct.tm_mon; 173 const int printed = jio_snprintf(buffer, buffer_length, iso8601_format, 174 year, 175 month, 176 time_struct.tm_mday, 177 time_struct.tm_hour, 178 time_struct.tm_min, 179 time_struct.tm_sec, 180 milliseconds_after_second, 181 sign_local_to_UTC, 182 zone_hours, 183 zone_min); 184 if (printed == 0) { 185 assert(false, "Failed jio_printf"); 186 return NULL; 187 } 188 return buffer; 189 } 190 191 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { 192 #ifdef ASSERT 193 if (!(!thread->is_Java_thread() || 194 Thread::current() == thread || 195 Threads_lock->owned_by_self() 196 || thread->is_Compiler_thread() 197 )) { 198 assert(false, "possibility of dangling Thread pointer"); 199 } 200 #endif 201 202 if (p >= MinPriority && p <= MaxPriority) { 203 int priority = java_to_os_priority[p]; 204 return set_native_priority(thread, priority); 205 } else { 206 assert(false, "Should not happen"); 207 return OS_ERR; 208 } 209 } 210 211 // The mapping from OS priority back to Java priority may be inexact because 212 // Java priorities can map M:1 with native priorities. If you want the definite 213 // Java priority then use JavaThread::java_priority() 214 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { 215 int p; 216 int os_prio; 217 OSReturn ret = get_native_priority(thread, &os_prio); 218 if (ret != OS_OK) return ret; 219 220 if (java_to_os_priority[MaxPriority] > java_to_os_priority[MinPriority]) { 221 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; 222 } else { 223 // niceness values are in reverse order 224 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] < os_prio; p--) ; 225 } 226 priority = (ThreadPriority)p; 227 return OS_OK; 228 } 229 230 231 // --------------------- sun.misc.Signal (optional) --------------------- 232 233 234 // SIGBREAK is sent by the keyboard to query the VM state 235 #ifndef SIGBREAK 236 #define SIGBREAK SIGQUIT 237 #endif 238 239 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. 240 241 242 static void signal_thread_entry(JavaThread* thread, TRAPS) { 243 os::set_priority(thread, NearMaxPriority); 244 while (true) { 245 int sig; 246 { 247 // FIXME : Currently we have not decieded what should be the status 248 // for this java thread blocked here. Once we decide about 249 // that we should fix this. 250 sig = os::signal_wait(); 251 } 252 if (sig == os::sigexitnum_pd()) { 253 // Terminate the signal thread 254 return; 255 } 256 257 switch (sig) { 258 case SIGBREAK: { 259 // Check if the signal is a trigger to start the Attach Listener - in that 260 // case don't print stack traces. 261 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { 262 continue; 263 } 264 // Print stack traces 265 // Any SIGBREAK operations added here should make sure to flush 266 // the output stream (e.g. tty->flush()) after output. See 4803766. 267 // Each module also prints an extra carriage return after its output. 268 VM_PrintThreads op; 269 VMThread::execute(&op); 270 VM_PrintJNI jni_op; 271 VMThread::execute(&jni_op); 272 VM_FindDeadlocks op1(tty); 273 VMThread::execute(&op1); 274 Universe::print_heap_at_SIGBREAK(); 275 if (PrintClassHistogram) { 276 VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */); 277 VMThread::execute(&op1); 278 } 279 if (JvmtiExport::should_post_data_dump()) { 280 JvmtiExport::post_data_dump(); 281 } 282 break; 283 } 284 default: { 285 // Dispatch the signal to java 286 HandleMark hm(THREAD); 287 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_Signal(), THREAD); 288 KlassHandle klass (THREAD, k); 289 if (klass.not_null()) { 290 JavaValue result(T_VOID); 291 JavaCallArguments args; 292 args.push_int(sig); 293 JavaCalls::call_static( 294 &result, 295 klass, 296 vmSymbols::dispatch_name(), 297 vmSymbols::int_void_signature(), 298 &args, 299 THREAD 300 ); 301 } 302 if (HAS_PENDING_EXCEPTION) { 303 // tty is initialized early so we don't expect it to be null, but 304 // if it is we can't risk doing an initialization that might 305 // trigger additional out-of-memory conditions 306 if (tty != NULL) { 307 char klass_name[256]; 308 char tmp_sig_name[16]; 309 const char* sig_name = "UNKNOWN"; 310 InstanceKlass::cast(PENDING_EXCEPTION->klass())-> 311 name()->as_klass_external_name(klass_name, 256); 312 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) 313 sig_name = tmp_sig_name; 314 warning("Exception %s occurred dispatching signal %s to handler" 315 "- the VM may need to be forcibly terminated", 316 klass_name, sig_name ); 317 } 318 CLEAR_PENDING_EXCEPTION; 319 } 320 } 321 } 322 } 323 } 324 325 void os::init_before_ergo() { 326 initialize_initial_active_processor_count(); 327 // We need to initialize large page support here because ergonomics takes some 328 // decisions depending on large page support and the calculated large page size. 329 large_page_init(); 330 331 // VM version initialization identifies some characteristics of the 332 // the platform that are used during ergonomic decisions. 333 VM_Version::init_before_ergo(); 334 } 335 336 void os::signal_init() { 337 if (!ReduceSignalUsage) { 338 // Setup JavaThread for processing signals 339 EXCEPTION_MARK; 340 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); 341 instanceKlassHandle klass (THREAD, k); 342 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); 343 344 const char thread_name[] = "Signal Dispatcher"; 345 Handle string = java_lang_String::create_from_str(thread_name, CHECK); 346 347 // Initialize thread_oop to put it into the system threadGroup 348 Handle thread_group (THREAD, Universe::system_thread_group()); 349 JavaValue result(T_VOID); 350 JavaCalls::call_special(&result, thread_oop, 351 klass, 352 vmSymbols::object_initializer_name(), 353 vmSymbols::threadgroup_string_void_signature(), 354 thread_group, 355 string, 356 CHECK); 357 358 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); 359 JavaCalls::call_special(&result, 360 thread_group, 361 group, 362 vmSymbols::add_method_name(), 363 vmSymbols::thread_void_signature(), 364 thread_oop, // ARG 1 365 CHECK); 366 367 os::signal_init_pd(); 368 369 { MutexLocker mu(Threads_lock); 370 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); 371 372 // At this point it may be possible that no osthread was created for the 373 // JavaThread due to lack of memory. We would have to throw an exception 374 // in that case. However, since this must work and we do not allow 375 // exceptions anyway, check and abort if this fails. 376 if (signal_thread == NULL || signal_thread->osthread() == NULL) { 377 vm_exit_during_initialization("java.lang.OutOfMemoryError", 378 "unable to create new native thread"); 379 } 380 381 java_lang_Thread::set_thread(thread_oop(), signal_thread); 382 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 383 java_lang_Thread::set_daemon(thread_oop()); 384 385 signal_thread->set_threadObj(thread_oop()); 386 Threads::add(signal_thread); 387 Thread::start(signal_thread); 388 } 389 // Handle ^BREAK 390 os::signal(SIGBREAK, os::user_handler()); 391 } 392 } 393 394 395 void os::terminate_signal_thread() { 396 if (!ReduceSignalUsage) 397 signal_notify(sigexitnum_pd()); 398 } 399 400 401 // --------------------- loading libraries --------------------- 402 403 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); 404 extern struct JavaVM_ main_vm; 405 406 static void* _native_java_library = NULL; 407 408 void* os::native_java_library() { 409 if (_native_java_library == NULL) { 410 char buffer[JVM_MAXPATHLEN]; 411 char ebuf[1024]; 412 413 // Try to load verify dll first. In 1.3 java dll depends on it and is not 414 // always able to find it when the loading executable is outside the JDK. 415 // In order to keep working with 1.2 we ignore any loading errors. 416 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), 417 "verify")) { 418 dll_load(buffer, ebuf, sizeof(ebuf)); 419 } 420 421 // Load java dll 422 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), 423 "java")) { 424 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); 425 } 426 if (_native_java_library == NULL) { 427 vm_exit_during_initialization("Unable to load native library", ebuf); 428 } 429 430 #if defined(__OpenBSD__) 431 // Work-around OpenBSD's lack of $ORIGIN support by pre-loading libnet.so 432 // ignore errors 433 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), 434 "net")) { 435 dll_load(buffer, ebuf, sizeof(ebuf)); 436 } 437 #endif 438 } 439 static jboolean onLoaded = JNI_FALSE; 440 if (onLoaded) { 441 // We may have to wait to fire OnLoad until TLS is initialized. 442 if (ThreadLocalStorage::is_initialized()) { 443 // The JNI_OnLoad handling is normally done by method load in 444 // java.lang.ClassLoader$NativeLibrary, but the VM loads the base library 445 // explicitly so we have to check for JNI_OnLoad as well 446 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; 447 JNI_OnLoad_t JNI_OnLoad = CAST_TO_FN_PTR( 448 JNI_OnLoad_t, dll_lookup(_native_java_library, onLoadSymbols[0])); 449 if (JNI_OnLoad != NULL) { 450 JavaThread* thread = JavaThread::current(); 451 ThreadToNativeFromVM ttn(thread); 452 HandleMark hm(thread); 453 jint ver = (*JNI_OnLoad)(&main_vm, NULL); 454 onLoaded = JNI_TRUE; 455 if (!Threads::is_supported_jni_version_including_1_1(ver)) { 456 vm_exit_during_initialization("Unsupported JNI version"); 457 } 458 } 459 } 460 } 461 return _native_java_library; 462 } 463 464 /* 465 * Support for finding Agent_On(Un)Load/Attach<_lib_name> if it exists. 466 * If check_lib == true then we are looking for an 467 * Agent_OnLoad_lib_name or Agent_OnAttach_lib_name function to determine if 468 * this library is statically linked into the image. 469 * If check_lib == false then we will look for the appropriate symbol in the 470 * executable if agent_lib->is_static_lib() == true or in the shared library 471 * referenced by 'handle'. 472 */ 473 void* os::find_agent_function(AgentLibrary *agent_lib, bool check_lib, 474 const char *syms[], size_t syms_len) { 475 assert(agent_lib != NULL, "sanity check"); 476 const char *lib_name; 477 void *handle = agent_lib->os_lib(); 478 void *entryName = NULL; 479 char *agent_function_name; 480 size_t i; 481 482 // If checking then use the agent name otherwise test is_static_lib() to 483 // see how to process this lookup 484 lib_name = ((check_lib || agent_lib->is_static_lib()) ? agent_lib->name() : NULL); 485 for (i = 0; i < syms_len; i++) { 486 agent_function_name = build_agent_function_name(syms[i], lib_name, agent_lib->is_absolute_path()); 487 if (agent_function_name == NULL) { 488 break; 489 } 490 entryName = dll_lookup(handle, agent_function_name); 491 FREE_C_HEAP_ARRAY(char, agent_function_name, mtThread); 492 if (entryName != NULL) { 493 break; 494 } 495 } 496 return entryName; 497 } 498 499 // See if the passed in agent is statically linked into the VM image. 500 bool os::find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], 501 size_t syms_len) { 502 void *ret; 503 void *proc_handle; 504 void *save_handle; 505 506 assert(agent_lib != NULL, "sanity check"); 507 if (agent_lib->name() == NULL) { 508 return false; 509 } 510 proc_handle = get_default_process_handle(); 511 // Check for Agent_OnLoad/Attach_lib_name function 512 save_handle = agent_lib->os_lib(); 513 // We want to look in this process' symbol table. 514 agent_lib->set_os_lib(proc_handle); 515 ret = find_agent_function(agent_lib, true, syms, syms_len); 516 if (ret != NULL) { 517 // Found an entry point like Agent_OnLoad_lib_name so we have a static agent 518 agent_lib->set_valid(); 519 agent_lib->set_static_lib(true); 520 return true; 521 } 522 agent_lib->set_os_lib(save_handle); 523 return false; 524 } 525 526 // --------------------- heap allocation utilities --------------------- 527 528 char *os::strdup(const char *str, MEMFLAGS flags) { 529 size_t size = strlen(str); 530 char *dup_str = (char *)malloc(size + 1, flags); 531 if (dup_str == NULL) return NULL; 532 strcpy(dup_str, str); 533 return dup_str; 534 } 535 536 537 538 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ 539 540 #ifdef ASSERT 541 static void verify_memory(void* ptr) { 542 GuardedMemory guarded(ptr); 543 if (!guarded.verify_guards()) { 544 tty->print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT, os::num_mallocs, os::num_frees); 545 tty->print_cr("## memory stomp:"); 546 guarded.print_on(tty); 547 fatal("memory stomping error"); 548 } 549 } 550 #endif 551 552 // 553 // This function supports testing of the malloc out of memory 554 // condition without really running the system out of memory. 555 // 556 static u_char* testMalloc(size_t alloc_size) { 557 assert(MallocMaxTestWords > 0, "sanity check"); 558 559 if ((cur_malloc_words + (alloc_size / BytesPerWord)) > MallocMaxTestWords) { 560 return NULL; 561 } 562 563 u_char* ptr = (u_char*)::malloc(alloc_size); 564 565 if (ptr != NULL) { 566 Atomic::add(((jint) (alloc_size / BytesPerWord)), 567 (volatile jint *) &cur_malloc_words); 568 } 569 return ptr; 570 } 571 572 void* os::malloc(size_t size, MEMFLAGS flags) { 573 return os::malloc(size, flags, CALLER_PC); 574 } 575 576 void* os::malloc(size_t size, MEMFLAGS memflags, const NativeCallStack& stack) { 577 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); 578 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); 579 580 #ifdef ASSERT 581 // checking for the WatcherThread and crash_protection first 582 // since os::malloc can be called when the libjvm.{dll,so} is 583 // first loaded and we don't have a thread yet. 584 // try to find the thread after we see that the watcher thread 585 // exists and has crash protection. 586 WatcherThread *wt = WatcherThread::watcher_thread(); 587 if (wt != NULL && wt->has_crash_protection()) { 588 Thread* thread = ThreadLocalStorage::get_thread_slow(); 589 if (thread == wt) { 590 assert(!wt->has_crash_protection(), 591 "Can't malloc with crash protection from WatcherThread"); 592 } 593 } 594 #endif 595 596 if (size == 0) { 597 // return a valid pointer if size is zero 598 // if NULL is returned the calling functions assume out of memory. 599 size = 1; 600 } 601 602 // NMT support 603 NMT_TrackingLevel level = MemTracker::tracking_level(); 604 size_t nmt_header_size = MemTracker::malloc_header_size(level); 605 606 #ifndef ASSERT 607 const size_t alloc_size = size + nmt_header_size; 608 #else 609 const size_t alloc_size = GuardedMemory::get_total_size(size + nmt_header_size); 610 if (size + nmt_header_size > alloc_size) { // Check for rollover. 611 return NULL; 612 } 613 #endif 614 615 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); 616 617 u_char* ptr; 618 if (MallocMaxTestWords > 0) { 619 ptr = testMalloc(alloc_size); 620 } else { 621 ptr = (u_char*)::malloc(alloc_size); 622 } 623 624 #ifdef ASSERT 625 if (ptr == NULL) { 626 return NULL; 627 } 628 // Wrap memory with guard 629 GuardedMemory guarded(ptr, size + nmt_header_size); 630 ptr = guarded.get_user_ptr(); 631 #endif 632 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { 633 tty->print_cr("os::malloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); 634 breakpoint(); 635 } 636 debug_only(if (paranoid) verify_memory(ptr)); 637 if (PrintMalloc && tty != NULL) { 638 tty->print_cr("os::malloc " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); 639 } 640 641 // we do not track guard memory 642 return MemTracker::record_malloc((address)ptr, size, memflags, stack, level); 643 } 644 645 void* os::realloc(void *memblock, size_t size, MEMFLAGS flags) { 646 return os::realloc(memblock, size, flags, CALLER_PC); 647 } 648 649 void* os::realloc(void *memblock, size_t size, MEMFLAGS memflags, const NativeCallStack& stack) { 650 651 #ifndef ASSERT 652 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); 653 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); 654 // NMT support 655 void* membase = MemTracker::record_free(memblock); 656 NMT_TrackingLevel level = MemTracker::tracking_level(); 657 size_t nmt_header_size = MemTracker::malloc_header_size(level); 658 void* ptr = ::realloc(membase, size + nmt_header_size); 659 return MemTracker::record_malloc(ptr, size, memflags, stack, level); 660 #else 661 if (memblock == NULL) { 662 return os::malloc(size, memflags, stack); 663 } 664 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { 665 tty->print_cr("os::realloc caught " PTR_FORMAT, memblock); 666 breakpoint(); 667 } 668 // NMT support 669 void* membase = MemTracker::malloc_base(memblock); 670 verify_memory(membase); 671 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); 672 if (size == 0) { 673 return NULL; 674 } 675 // always move the block 676 void* ptr = os::malloc(size, memflags, stack); 677 if (PrintMalloc) { 678 tty->print_cr("os::remalloc " SIZE_FORMAT " bytes, " PTR_FORMAT " --> " PTR_FORMAT, size, memblock, ptr); 679 } 680 // Copy to new memory if malloc didn't fail 681 if ( ptr != NULL ) { 682 GuardedMemory guarded(MemTracker::malloc_base(memblock)); 683 // Guard's user data contains NMT header 684 size_t memblock_size = guarded.get_user_size() - MemTracker::malloc_header_size(memblock); 685 memcpy(ptr, memblock, MIN2(size, memblock_size)); 686 if (paranoid) verify_memory(MemTracker::malloc_base(ptr)); 687 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { 688 tty->print_cr("os::realloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); 689 breakpoint(); 690 } 691 os::free(memblock); 692 } 693 return ptr; 694 #endif 695 } 696 697 698 void os::free(void *memblock, MEMFLAGS memflags) { 699 NOT_PRODUCT(inc_stat_counter(&num_frees, 1)); 700 #ifdef ASSERT 701 if (memblock == NULL) return; 702 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { 703 if (tty != NULL) tty->print_cr("os::free caught " PTR_FORMAT, memblock); 704 breakpoint(); 705 } 706 void* membase = MemTracker::record_free(memblock); 707 verify_memory(membase); 708 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); 709 710 GuardedMemory guarded(membase); 711 size_t size = guarded.get_user_size(); 712 inc_stat_counter(&free_bytes, size); 713 membase = guarded.release_for_freeing(); 714 if (PrintMalloc && tty != NULL) { 715 fprintf(stderr, "os::free " SIZE_FORMAT " bytes --> " PTR_FORMAT "\n", size, (uintptr_t)membase); 716 } 717 ::free(membase); 718 #else 719 void* membase = MemTracker::record_free(memblock); 720 ::free(membase); 721 #endif 722 } 723 724 void os::init_random(long initval) { 725 _rand_seed = initval; 726 } 727 728 729 long os::random() { 730 /* standard, well-known linear congruential random generator with 731 * next_rand = (16807*seed) mod (2**31-1) 732 * see 733 * (1) "Random Number Generators: Good Ones Are Hard to Find", 734 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), 735 * (2) "Two Fast Implementations of the 'Minimal Standard' Random 736 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. 737 */ 738 const long a = 16807; 739 const unsigned long m = 2147483647; 740 const long q = m / a; assert(q == 127773, "weird math"); 741 const long r = m % a; assert(r == 2836, "weird math"); 742 743 // compute az=2^31p+q 744 unsigned long lo = a * (long)(_rand_seed & 0xFFFF); 745 unsigned long hi = a * (long)((unsigned long)_rand_seed >> 16); 746 lo += (hi & 0x7FFF) << 16; 747 748 // if q overflowed, ignore the overflow and increment q 749 if (lo > m) { 750 lo &= m; 751 ++lo; 752 } 753 lo += hi >> 15; 754 755 // if (p+q) overflowed, ignore the overflow and increment (p+q) 756 if (lo > m) { 757 lo &= m; 758 ++lo; 759 } 760 return (_rand_seed = lo); 761 } 762 763 // The INITIALIZED state is distinguished from the SUSPENDED state because the 764 // conditions in which a thread is first started are different from those in which 765 // a suspension is resumed. These differences make it hard for us to apply the 766 // tougher checks when starting threads that we want to do when resuming them. 767 // However, when start_thread is called as a result of Thread.start, on a Java 768 // thread, the operation is synchronized on the Java Thread object. So there 769 // cannot be a race to start the thread and hence for the thread to exit while 770 // we are working on it. Non-Java threads that start Java threads either have 771 // to do so in a context in which races are impossible, or should do appropriate 772 // locking. 773 774 void os::start_thread(Thread* thread) { 775 // guard suspend/resume 776 MutexLockerEx ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); 777 OSThread* osthread = thread->osthread(); 778 osthread->set_state(RUNNABLE); 779 pd_start_thread(thread); 780 } 781 782 //--------------------------------------------------------------------------- 783 // Helper functions for fatal error handler 784 785 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { 786 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); 787 788 int cols = 0; 789 int cols_per_line = 0; 790 switch (unitsize) { 791 case 1: cols_per_line = 16; break; 792 case 2: cols_per_line = 8; break; 793 case 4: cols_per_line = 4; break; 794 case 8: cols_per_line = 2; break; 795 default: return; 796 } 797 798 address p = start; 799 st->print(PTR_FORMAT ": ", start); 800 while (p < end) { 801 switch (unitsize) { 802 case 1: st->print("%02x", *(u1*)p); break; 803 case 2: st->print("%04x", *(u2*)p); break; 804 case 4: st->print("%08x", *(u4*)p); break; 805 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; 806 } 807 p += unitsize; 808 cols++; 809 if (cols >= cols_per_line && p < end) { 810 cols = 0; 811 st->cr(); 812 st->print(PTR_FORMAT ": ", p); 813 } else { 814 st->print(" "); 815 } 816 } 817 st->cr(); 818 } 819 820 void os::print_environment_variables(outputStream* st, const char** env_list, 821 char* buffer, int len) { 822 if (env_list) { 823 st->print_cr("Environment Variables:"); 824 825 for (int i = 0; env_list[i] != NULL; i++) { 826 if (getenv(env_list[i], buffer, len)) { 827 st->print("%s", env_list[i]); 828 st->print("="); 829 st->print_cr("%s", buffer); 830 } 831 } 832 } 833 } 834 835 void os::print_cpu_info(outputStream* st) { 836 // cpu 837 st->print("CPU:"); 838 st->print("total %d", os::processor_count()); 839 // It's not safe to query number of active processors after crash 840 // st->print("(active %d)", os::active_processor_count()); but we can 841 // print the initial number of active processors. 842 // We access the raw value here because the assert in the accessor will 843 // fail if the crash occurs before initialization of this value. 844 st->print(" (initial active %d)", _initial_active_processor_count); 845 st->print(" %s", VM_Version::cpu_features()); 846 st->cr(); 847 pd_print_cpu_info(st); 848 } 849 850 void os::print_date_and_time(outputStream *st, char* buf, size_t buflen) { 851 const int secs_per_day = 86400; 852 const int secs_per_hour = 3600; 853 const int secs_per_min = 60; 854 855 time_t tloc; 856 (void)time(&tloc); 857 st->print("time: %s", ctime(&tloc)); // ctime adds newline. 858 859 struct tm tz; 860 if (localtime_pd(&tloc, &tz) != NULL) { 861 ::strftime(buf, buflen, "%Z", &tz); 862 st->print_cr("timezone: %s", buf); 863 } 864 865 double t = os::elapsedTime(); 866 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in 867 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int 868 // before printf. We lost some precision, but who cares? 869 int eltime = (int)t; // elapsed time in seconds 870 871 // print elapsed time in a human-readable format: 872 int eldays = eltime / secs_per_day; 873 int day_secs = eldays * secs_per_day; 874 int elhours = (eltime - day_secs) / secs_per_hour; 875 int hour_secs = elhours * secs_per_hour; 876 int elmins = (eltime - day_secs - hour_secs) / secs_per_min; 877 int minute_secs = elmins * secs_per_min; 878 int elsecs = (eltime - day_secs - hour_secs - minute_secs); 879 st->print_cr("elapsed time: %d seconds (%dd %dh %dm %ds)", eltime, eldays, elhours, elmins, elsecs); 880 } 881 882 // moved from debug.cpp (used to be find()) but still called from there 883 // The verbose parameter is only set by the debug code in one case 884 void os::print_location(outputStream* st, intptr_t x, bool verbose) { 885 address addr = (address)x; 886 CodeBlob* b = CodeCache::find_blob_unsafe(addr); 887 if (b != NULL) { 888 if (b->is_buffer_blob()) { 889 // the interpreter is generated into a buffer blob 890 InterpreterCodelet* i = Interpreter::codelet_containing(addr); 891 if (i != NULL) { 892 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an Interpreter codelet", addr, (int)(addr - i->code_begin())); 893 i->print_on(st); 894 return; 895 } 896 if (Interpreter::contains(addr)) { 897 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code" 898 " (not bytecode specific)", addr); 899 return; 900 } 901 // 902 if (AdapterHandlerLibrary::contains(b)) { 903 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an AdapterHandler", addr, (int)(addr - b->code_begin())); 904 AdapterHandlerLibrary::print_handler_on(st, b); 905 } 906 // the stubroutines are generated into a buffer blob 907 StubCodeDesc* d = StubCodeDesc::desc_for(addr); 908 if (d != NULL) { 909 st->print_cr(INTPTR_FORMAT " is at begin+%d in a stub", addr, (int)(addr - d->begin())); 910 d->print_on(st); 911 st->cr(); 912 return; 913 } 914 if (StubRoutines::contains(addr)) { 915 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) " 916 "stub routine", addr); 917 return; 918 } 919 // the InlineCacheBuffer is using stubs generated into a buffer blob 920 if (InlineCacheBuffer::contains(addr)) { 921 st->print_cr(INTPTR_FORMAT " is pointing into InlineCacheBuffer", addr); 922 return; 923 } 924 VtableStub* v = VtableStubs::stub_containing(addr); 925 if (v != NULL) { 926 st->print_cr(INTPTR_FORMAT " is at entry_point+%d in a vtable stub", addr, (int)(addr - v->entry_point())); 927 v->print_on(st); 928 st->cr(); 929 return; 930 } 931 } 932 nmethod* nm = b->as_nmethod_or_null(); 933 if (nm != NULL) { 934 ResourceMark rm; 935 st->print(INTPTR_FORMAT " is at entry_point+%d in (nmethod*)" INTPTR_FORMAT, 936 addr, (int)(addr - nm->entry_point()), nm); 937 if (verbose) { 938 st->print(" for "); 939 nm->method()->print_value_on(st); 940 } 941 st->cr(); 942 nm->print_nmethod(verbose); 943 return; 944 } 945 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in ", addr, (int)(addr - b->code_begin())); 946 b->print_on(st); 947 return; 948 } 949 950 if (Universe::heap()->is_in(addr)) { 951 HeapWord* p = Universe::heap()->block_start(addr); 952 bool print = false; 953 // If we couldn't find it it just may mean that heap wasn't parseable 954 // See if we were just given an oop directly 955 if (p != NULL && Universe::heap()->block_is_obj(p)) { 956 print = true; 957 } else if (p == NULL && ((oopDesc*)addr)->is_oop()) { 958 p = (HeapWord*) addr; 959 print = true; 960 } 961 if (print) { 962 if (p == (HeapWord*) addr) { 963 st->print_cr(INTPTR_FORMAT " is an oop", addr); 964 } else { 965 st->print_cr(INTPTR_FORMAT " is pointing into object: " INTPTR_FORMAT, addr, p); 966 } 967 oop(p)->print_on(st); 968 return; 969 } 970 } else { 971 if (Universe::heap()->is_in_reserved(addr)) { 972 st->print_cr(INTPTR_FORMAT " is an unallocated location " 973 "in the heap", addr); 974 return; 975 } 976 } 977 if (JNIHandles::is_global_handle((jobject) addr)) { 978 st->print_cr(INTPTR_FORMAT " is a global jni handle", addr); 979 return; 980 } 981 if (JNIHandles::is_weak_global_handle((jobject) addr)) { 982 st->print_cr(INTPTR_FORMAT " is a weak global jni handle", addr); 983 return; 984 } 985 #ifndef PRODUCT 986 // we don't keep the block list in product mode 987 if (JNIHandleBlock::any_contains((jobject) addr)) { 988 st->print_cr(INTPTR_FORMAT " is a local jni handle", addr); 989 return; 990 } 991 #endif 992 993 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { 994 // Check for privilege stack 995 if (thread->privileged_stack_top() != NULL && 996 thread->privileged_stack_top()->contains(addr)) { 997 st->print_cr(INTPTR_FORMAT " is pointing into the privilege stack " 998 "for thread: " INTPTR_FORMAT, addr, thread); 999 if (verbose) thread->print_on(st); 1000 return; 1001 } 1002 // If the addr is a java thread print information about that. 1003 if (addr == (address)thread) { 1004 if (verbose) { 1005 thread->print_on(st); 1006 } else { 1007 st->print_cr(INTPTR_FORMAT " is a thread", addr); 1008 } 1009 return; 1010 } 1011 // If the addr is in the stack region for this thread then report that 1012 // and print thread info 1013 if (thread->stack_base() >= addr && 1014 addr > (thread->stack_base() - thread->stack_size())) { 1015 st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " 1016 INTPTR_FORMAT, addr, thread); 1017 if (verbose) thread->print_on(st); 1018 return; 1019 } 1020 1021 } 1022 1023 // Check if in metaspace and print types that have vptrs (only method now) 1024 if (Metaspace::contains(addr)) { 1025 if (Method::has_method_vptr((const void*)addr)) { 1026 ((Method*)addr)->print_value_on(st); 1027 st->cr(); 1028 } else { 1029 // Use addr->print() from the debugger instead (not here) 1030 st->print_cr(INTPTR_FORMAT " is pointing into metadata", addr); 1031 } 1032 return; 1033 } 1034 1035 // Try an OS specific find 1036 if (os::find(addr, st)) { 1037 return; 1038 } 1039 1040 st->print_cr(INTPTR_FORMAT " is an unknown value", addr); 1041 } 1042 1043 // Looks like all platforms except IA64 can use the same function to check 1044 // if C stack is walkable beyond current frame. The check for fp() is not 1045 // necessary on Sparc, but it's harmless. 1046 bool os::is_first_C_frame(frame* fr) { 1047 #if (defined(IA64) && !defined(AIX)) && !defined(_WIN32) 1048 // On IA64 we have to check if the callers bsp is still valid 1049 // (i.e. within the register stack bounds). 1050 // Notice: this only works for threads created by the VM and only if 1051 // we walk the current stack!!! If we want to be able to walk 1052 // arbitrary other threads, we'll have to somehow store the thread 1053 // object in the frame. 1054 Thread *thread = Thread::current(); 1055 if ((address)fr->fp() <= 1056 thread->register_stack_base() HPUX_ONLY(+ 0x0) LINUX_ONLY(+ 0x50)) { 1057 // This check is a little hacky, because on Linux the first C 1058 // frame's ('start_thread') register stack frame starts at 1059 // "register_stack_base + 0x48" while on HPUX, the first C frame's 1060 // ('__pthread_bound_body') register stack frame seems to really 1061 // start at "register_stack_base". 1062 return true; 1063 } else { 1064 return false; 1065 } 1066 #elif defined(IA64) && defined(_WIN32) 1067 return true; 1068 #else 1069 // Load up sp, fp, sender sp and sender fp, check for reasonable values. 1070 // Check usp first, because if that's bad the other accessors may fault 1071 // on some architectures. Ditto ufp second, etc. 1072 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); 1073 // sp on amd can be 32 bit aligned. 1074 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); 1075 1076 uintptr_t usp = (uintptr_t)fr->sp(); 1077 if ((usp & sp_align_mask) != 0) return true; 1078 1079 uintptr_t ufp = (uintptr_t)fr->fp(); 1080 if ((ufp & fp_align_mask) != 0) return true; 1081 1082 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); 1083 if ((old_sp & sp_align_mask) != 0) return true; 1084 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; 1085 1086 uintptr_t old_fp = (uintptr_t)fr->link(); 1087 if ((old_fp & fp_align_mask) != 0) return true; 1088 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; 1089 1090 // stack grows downwards; if old_fp is below current fp or if the stack 1091 // frame is too large, either the stack is corrupted or fp is not saved 1092 // on stack (i.e. on x86, ebp may be used as general register). The stack 1093 // is not walkable beyond current frame. 1094 if (old_fp < ufp) return true; 1095 if (old_fp - ufp > 64 * K) return true; 1096 1097 return false; 1098 #endif 1099 } 1100 1101 #ifdef ASSERT 1102 extern "C" void test_random() { 1103 const double m = 2147483647; 1104 double mean = 0.0, variance = 0.0, t; 1105 long reps = 10000; 1106 unsigned long seed = 1; 1107 1108 tty->print_cr("seed %ld for %ld repeats...", seed, reps); 1109 os::init_random(seed); 1110 long num; 1111 for (int k = 0; k < reps; k++) { 1112 num = os::random(); 1113 double u = (double)num / m; 1114 assert(u >= 0.0 && u <= 1.0, "bad random number!"); 1115 1116 // calculate mean and variance of the random sequence 1117 mean += u; 1118 variance += (u*u); 1119 } 1120 mean /= reps; 1121 variance /= (reps - 1); 1122 1123 assert(num == 1043618065, "bad seed"); 1124 tty->print_cr("mean of the 1st 10000 numbers: %f", mean); 1125 tty->print_cr("variance of the 1st 10000 numbers: %f", variance); 1126 const double eps = 0.0001; 1127 t = fabsd(mean - 0.5018); 1128 assert(t < eps, "bad mean"); 1129 t = (variance - 0.3355) < 0.0 ? -(variance - 0.3355) : variance - 0.3355; 1130 assert(t < eps, "bad variance"); 1131 } 1132 #endif 1133 1134 1135 // Set up the boot classpath. 1136 1137 char* os::format_boot_path(const char* format_string, 1138 const char* home, 1139 int home_len, 1140 char fileSep, 1141 char pathSep) { 1142 assert((fileSep == '/' && pathSep == ':') || 1143 (fileSep == '\\' && pathSep == ';'), "unexpected seperator chars"); 1144 1145 // Scan the format string to determine the length of the actual 1146 // boot classpath, and handle platform dependencies as well. 1147 int formatted_path_len = 0; 1148 const char* p; 1149 for (p = format_string; *p != 0; ++p) { 1150 if (*p == '%') formatted_path_len += home_len - 1; 1151 ++formatted_path_len; 1152 } 1153 1154 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1, mtInternal); 1155 if (formatted_path == NULL) { 1156 return NULL; 1157 } 1158 1159 // Create boot classpath from format, substituting separator chars and 1160 // java home directory. 1161 char* q = formatted_path; 1162 for (p = format_string; *p != 0; ++p) { 1163 switch (*p) { 1164 case '%': 1165 strcpy(q, home); 1166 q += home_len; 1167 break; 1168 case '/': 1169 *q++ = fileSep; 1170 break; 1171 case ':': 1172 *q++ = pathSep; 1173 break; 1174 default: 1175 *q++ = *p; 1176 } 1177 } 1178 *q = '\0'; 1179 1180 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); 1181 return formatted_path; 1182 } 1183 1184 1185 bool os::set_boot_path(char fileSep, char pathSep) { 1186 const char* home = Arguments::get_java_home(); 1187 int home_len = (int)strlen(home); 1188 1189 static const char* meta_index_dir_format = "%/lib/"; 1190 static const char* meta_index_format = "%/lib/meta-index"; 1191 char* meta_index = format_boot_path(meta_index_format, home, home_len, fileSep, pathSep); 1192 if (meta_index == NULL) return false; 1193 char* meta_index_dir = format_boot_path(meta_index_dir_format, home, home_len, fileSep, pathSep); 1194 if (meta_index_dir == NULL) return false; 1195 Arguments::set_meta_index_path(meta_index, meta_index_dir); 1196 1197 // Any modification to the JAR-file list, for the boot classpath must be 1198 // aligned with install/install/make/common/Pack.gmk. Note: boot class 1199 // path class JARs, are stripped for StackMapTable to reduce download size. 1200 static const char classpath_format[] = 1201 "%/lib/resources.jar:" 1202 "%/lib/rt.jar:" 1203 "%/lib/sunrsasign.jar:" 1204 "%/lib/jsse.jar:" 1205 "%/lib/jce.jar:" 1206 "%/lib/charsets.jar:" 1207 "%/lib/jfr.jar:" 1208 "%/classes"; 1209 char* sysclasspath = format_boot_path(classpath_format, home, home_len, fileSep, pathSep); 1210 if (sysclasspath == NULL) return false; 1211 Arguments::set_sysclasspath(sysclasspath); 1212 1213 return true; 1214 } 1215 1216 /* 1217 * Splits a path, based on its separator, the number of 1218 * elements is returned back in n. 1219 * It is the callers responsibility to: 1220 * a> check the value of n, and n may be 0. 1221 * b> ignore any empty path elements 1222 * c> free up the data. 1223 */ 1224 char** os::split_path(const char* path, int* n) { 1225 *n = 0; 1226 if (path == NULL || strlen(path) == 0) { 1227 return NULL; 1228 } 1229 const char psepchar = *os::path_separator(); 1230 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1, mtInternal); 1231 if (inpath == NULL) { 1232 return NULL; 1233 } 1234 strcpy(inpath, path); 1235 int count = 1; 1236 char* p = strchr(inpath, psepchar); 1237 // Get a count of elements to allocate memory 1238 while (p != NULL) { 1239 count++; 1240 p++; 1241 p = strchr(p, psepchar); 1242 } 1243 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count, mtInternal); 1244 if (opath == NULL) { 1245 return NULL; 1246 } 1247 1248 // do the actual splitting 1249 p = inpath; 1250 for (int i = 0 ; i < count ; i++) { 1251 size_t len = strcspn(p, os::path_separator()); 1252 if (len > JVM_MAXPATHLEN) { 1253 return NULL; 1254 } 1255 // allocate the string and add terminator storage 1256 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 1257 if (s == NULL) { 1258 return NULL; 1259 } 1260 strncpy(s, p, len); 1261 s[len] = '\0'; 1262 opath[i] = s; 1263 p += len + 1; 1264 } 1265 FREE_C_HEAP_ARRAY(char, inpath, mtInternal); 1266 *n = count; 1267 return opath; 1268 } 1269 1270 void os::set_memory_serialize_page(address page) { 1271 int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); 1272 _mem_serialize_page = (volatile int32_t *)page; 1273 // We initialize the serialization page shift count here 1274 // We assume a cache line size of 64 bytes 1275 assert(SerializePageShiftCount == count, 1276 "thread size changed, fix SerializePageShiftCount constant"); 1277 set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t))); 1278 } 1279 1280 static volatile intptr_t SerializePageLock = 0; 1281 1282 // This method is called from signal handler when SIGSEGV occurs while the current 1283 // thread tries to store to the "read-only" memory serialize page during state 1284 // transition. 1285 void os::block_on_serialize_page_trap() { 1286 if (TraceSafepoint) { 1287 tty->print_cr("Block until the serialize page permission restored"); 1288 } 1289 // When VMThread is holding the SerializePageLock during modifying the 1290 // access permission of the memory serialize page, the following call 1291 // will block until the permission of that page is restored to rw. 1292 // Generally, it is unsafe to manipulate locks in signal handlers, but in 1293 // this case, it's OK as the signal is synchronous and we know precisely when 1294 // it can occur. 1295 Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page"); 1296 Thread::muxRelease(&SerializePageLock); 1297 } 1298 1299 // Serialize all thread state variables 1300 void os::serialize_thread_states() { 1301 // On some platforms such as Solaris & Linux, the time duration of the page 1302 // permission restoration is observed to be much longer than expected due to 1303 // scheduler starvation problem etc. To avoid the long synchronization 1304 // time and expensive page trap spinning, 'SerializePageLock' is used to block 1305 // the mutator thread if such case is encountered. See bug 6546278 for details. 1306 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); 1307 os::protect_memory((char *)os::get_memory_serialize_page(), 1308 os::vm_page_size(), MEM_PROT_READ); 1309 os::protect_memory((char *)os::get_memory_serialize_page(), 1310 os::vm_page_size(), MEM_PROT_RW); 1311 Thread::muxRelease(&SerializePageLock); 1312 } 1313 1314 // Returns true if the current stack pointer is above the stack shadow 1315 // pages, false otherwise. 1316 1317 bool os::stack_shadow_pages_available(Thread *thread, methodHandle method) { 1318 assert(StackRedPages > 0 && StackYellowPages > 0,"Sanity check"); 1319 address sp = current_stack_pointer(); 1320 // Check if we have StackShadowPages above the yellow zone. This parameter 1321 // is dependent on the depth of the maximum VM call stack possible from 1322 // the handler for stack overflow. 'instanceof' in the stack overflow 1323 // handler or a println uses at least 8k stack of VM and native code 1324 // respectively. 1325 const int framesize_in_bytes = 1326 Interpreter::size_top_interpreter_activation(method()) * wordSize; 1327 int reserved_area = ((StackShadowPages + StackRedPages + StackYellowPages) 1328 * vm_page_size()) + framesize_in_bytes; 1329 // The very lower end of the stack 1330 address stack_limit = thread->stack_base() - thread->stack_size(); 1331 return (sp > (stack_limit + reserved_area)); 1332 } 1333 1334 size_t os::page_size_for_region(size_t region_size, size_t min_pages, bool must_be_aligned) { 1335 assert(min_pages > 0, "sanity"); 1336 if (UseLargePages) { 1337 const size_t max_page_size = region_size / min_pages; 1338 1339 for (size_t i = 0; _page_sizes[i] != 0; ++i) { 1340 const size_t page_size = _page_sizes[i]; 1341 if (page_size <= max_page_size) { 1342 if (!must_be_aligned || is_size_aligned(region_size, page_size)) { 1343 return page_size; 1344 } 1345 } 1346 } 1347 } 1348 1349 return vm_page_size(); 1350 } 1351 1352 size_t os::page_size_for_region_aligned(size_t region_size, size_t min_pages) { 1353 return page_size_for_region(region_size, min_pages, true); 1354 } 1355 1356 size_t os::page_size_for_region_unaligned(size_t region_size, size_t min_pages) { 1357 return page_size_for_region(region_size, min_pages, false); 1358 } 1359 1360 #ifndef PRODUCT 1361 void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count) 1362 { 1363 if (TracePageSizes) { 1364 tty->print("%s: ", str); 1365 for (int i = 0; i < count; ++i) { 1366 tty->print(" " SIZE_FORMAT, page_sizes[i]); 1367 } 1368 tty->cr(); 1369 } 1370 } 1371 1372 void os::trace_page_sizes(const char* str, const size_t region_min_size, 1373 const size_t region_max_size, const size_t page_size, 1374 const char* base, const size_t size) 1375 { 1376 if (TracePageSizes) { 1377 tty->print_cr("%s: min=" SIZE_FORMAT " max=" SIZE_FORMAT 1378 " pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT 1379 " size=" SIZE_FORMAT, 1380 str, region_min_size, region_max_size, 1381 page_size, base, size); 1382 } 1383 } 1384 #endif // #ifndef PRODUCT 1385 1386 // This is the working definition of a server class machine: 1387 // >= 2 physical CPU's and >=2GB of memory, with some fuzz 1388 // because the graphics memory (?) sometimes masks physical memory. 1389 // If you want to change the definition of a server class machine 1390 // on some OS or platform, e.g., >=4GB on Windohs platforms, 1391 // then you'll have to parameterize this method based on that state, 1392 // as was done for logical processors here, or replicate and 1393 // specialize this method for each platform. (Or fix os to have 1394 // some inheritance structure and use subclassing. Sigh.) 1395 // If you want some platform to always or never behave as a server 1396 // class machine, change the setting of AlwaysActAsServerClassMachine 1397 // and NeverActAsServerClassMachine in globals*.hpp. 1398 bool os::is_server_class_machine() { 1399 // First check for the early returns 1400 if (NeverActAsServerClassMachine) { 1401 return false; 1402 } 1403 if (AlwaysActAsServerClassMachine) { 1404 return true; 1405 } 1406 // Then actually look at the machine 1407 bool result = false; 1408 const unsigned int server_processors = 2; 1409 const julong server_memory = 2UL * G; 1410 // We seem not to get our full complement of memory. 1411 // We allow some part (1/8?) of the memory to be "missing", 1412 // based on the sizes of DIMMs, and maybe graphics cards. 1413 const julong missing_memory = 256UL * M; 1414 1415 /* Is this a server class machine? */ 1416 if ((os::active_processor_count() >= (int)server_processors) && 1417 (os::physical_memory() >= (server_memory - missing_memory))) { 1418 const unsigned int logical_processors = 1419 VM_Version::logical_processors_per_package(); 1420 if (logical_processors > 1) { 1421 const unsigned int physical_packages = 1422 os::active_processor_count() / logical_processors; 1423 if (physical_packages > server_processors) { 1424 result = true; 1425 } 1426 } else { 1427 result = true; 1428 } 1429 } 1430 return result; 1431 } 1432 1433 void os::initialize_initial_active_processor_count() { 1434 assert(_initial_active_processor_count == 0, "Initial active processor count already set."); 1435 _initial_active_processor_count = active_processor_count(); 1436 } 1437 1438 void os::SuspendedThreadTask::run() { 1439 assert(Threads_lock->owned_by_self() || (_thread == VMThread::vm_thread()), "must have threads lock to call this"); 1440 internal_do_task(); 1441 _done = true; 1442 } 1443 1444 bool os::create_stack_guard_pages(char* addr, size_t bytes) { 1445 return os::pd_create_stack_guard_pages(addr, bytes); 1446 } 1447 1448 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 1449 char* result = pd_reserve_memory(bytes, addr, alignment_hint); 1450 if (result != NULL) { 1451 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1452 } 1453 1454 return result; 1455 } 1456 1457 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint, 1458 MEMFLAGS flags) { 1459 char* result = pd_reserve_memory(bytes, addr, alignment_hint); 1460 if (result != NULL) { 1461 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1462 MemTracker::record_virtual_memory_type((address)result, flags); 1463 } 1464 1465 return result; 1466 } 1467 1468 char* os::attempt_reserve_memory_at(size_t bytes, char* addr) { 1469 char* result = pd_attempt_reserve_memory_at(bytes, addr); 1470 if (result != NULL) { 1471 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1472 } 1473 return result; 1474 } 1475 1476 void os::split_reserved_memory(char *base, size_t size, 1477 size_t split, bool realloc) { 1478 pd_split_reserved_memory(base, size, split, realloc); 1479 } 1480 1481 bool os::commit_memory(char* addr, size_t bytes, bool executable) { 1482 bool res = pd_commit_memory(addr, bytes, executable); 1483 if (res) { 1484 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); 1485 } 1486 return res; 1487 } 1488 1489 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, 1490 bool executable) { 1491 bool res = os::pd_commit_memory(addr, size, alignment_hint, executable); 1492 if (res) { 1493 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); 1494 } 1495 return res; 1496 } 1497 1498 void os::commit_memory_or_exit(char* addr, size_t bytes, bool executable, 1499 const char* mesg) { 1500 pd_commit_memory_or_exit(addr, bytes, executable, mesg); 1501 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); 1502 } 1503 1504 void os::commit_memory_or_exit(char* addr, size_t size, size_t alignment_hint, 1505 bool executable, const char* mesg) { 1506 os::pd_commit_memory_or_exit(addr, size, alignment_hint, executable, mesg); 1507 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); 1508 } 1509 1510 bool os::uncommit_memory(char* addr, size_t bytes) { 1511 bool res; 1512 if (MemTracker::tracking_level() > NMT_minimal) { 1513 Tracker tkr = MemTracker::get_virtual_memory_uncommit_tracker(); 1514 res = pd_uncommit_memory(addr, bytes); 1515 if (res) { 1516 tkr.record((address)addr, bytes); 1517 } 1518 } else { 1519 res = pd_uncommit_memory(addr, bytes); 1520 } 1521 return res; 1522 } 1523 1524 bool os::release_memory(char* addr, size_t bytes) { 1525 bool res; 1526 if (MemTracker::tracking_level() > NMT_minimal) { 1527 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 1528 res = pd_release_memory(addr, bytes); 1529 if (res) { 1530 tkr.record((address)addr, bytes); 1531 } 1532 } else { 1533 res = pd_release_memory(addr, bytes); 1534 } 1535 return res; 1536 } 1537 1538 void os::pretouch_memory(char* start, char* end) { 1539 for (volatile char *p = start; p < end; p += os::vm_page_size()) { 1540 *p = 0; 1541 } 1542 } 1543 1544 char* os::map_memory(int fd, const char* file_name, size_t file_offset, 1545 char *addr, size_t bytes, bool read_only, 1546 bool allow_exec) { 1547 char* result = pd_map_memory(fd, file_name, file_offset, addr, bytes, read_only, allow_exec); 1548 if (result != NULL) { 1549 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, CALLER_PC); 1550 } 1551 return result; 1552 } 1553 1554 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 1555 char *addr, size_t bytes, bool read_only, 1556 bool allow_exec) { 1557 return pd_remap_memory(fd, file_name, file_offset, addr, bytes, 1558 read_only, allow_exec); 1559 } 1560 1561 bool os::unmap_memory(char *addr, size_t bytes) { 1562 bool result; 1563 if (MemTracker::tracking_level() > NMT_minimal) { 1564 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 1565 result = pd_unmap_memory(addr, bytes); 1566 if (result) { 1567 tkr.record((address)addr, bytes); 1568 } 1569 } else { 1570 result = pd_unmap_memory(addr, bytes); 1571 } 1572 return result; 1573 } 1574 1575 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { 1576 pd_free_memory(addr, bytes, alignment_hint); 1577 } 1578 1579 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 1580 pd_realign_memory(addr, bytes, alignment_hint); 1581 } 1582 1583 #ifndef TARGET_OS_FAMILY_windows 1584 /* try to switch state from state "from" to state "to" 1585 * returns the state set after the method is complete 1586 */ 1587 os::SuspendResume::State os::SuspendResume::switch_state(os::SuspendResume::State from, 1588 os::SuspendResume::State to) 1589 { 1590 os::SuspendResume::State result = 1591 (os::SuspendResume::State) Atomic::cmpxchg((jint) to, (jint *) &_state, (jint) from); 1592 if (result == from) { 1593 // success 1594 return to; 1595 } 1596 return result; 1597 } 1598 #endif 1599 1600 /////////////// Unit tests /////////////// 1601 1602 #ifndef PRODUCT 1603 1604 #define assert_eq(a,b) assert(a == b, err_msg(SIZE_FORMAT " != " SIZE_FORMAT, a, b)) 1605 1606 class TestOS : AllStatic { 1607 static size_t small_page_size() { 1608 return os::vm_page_size(); 1609 } 1610 1611 static size_t large_page_size() { 1612 const size_t large_page_size_example = 4 * M; 1613 return os::page_size_for_region_aligned(large_page_size_example, 1); 1614 } 1615 1616 static void test_page_size_for_region_aligned() { 1617 if (UseLargePages) { 1618 const size_t small_page = small_page_size(); 1619 const size_t large_page = large_page_size(); 1620 1621 if (large_page > small_page) { 1622 size_t num_small_pages_in_large = large_page / small_page; 1623 size_t page = os::page_size_for_region_aligned(large_page, num_small_pages_in_large); 1624 1625 assert_eq(page, small_page); 1626 } 1627 } 1628 } 1629 1630 static void test_page_size_for_region_alignment() { 1631 if (UseLargePages) { 1632 const size_t small_page = small_page_size(); 1633 const size_t large_page = large_page_size(); 1634 if (large_page > small_page) { 1635 const size_t unaligned_region = large_page + 17; 1636 size_t page = os::page_size_for_region_aligned(unaligned_region, 1); 1637 assert_eq(page, small_page); 1638 1639 const size_t num_pages = 5; 1640 const size_t aligned_region = large_page * num_pages; 1641 page = os::page_size_for_region_aligned(aligned_region, num_pages); 1642 assert_eq(page, large_page); 1643 } 1644 } 1645 } 1646 1647 static void test_page_size_for_region_unaligned() { 1648 if (UseLargePages) { 1649 // Given exact page size, should return that page size. 1650 for (size_t i = 0; os::_page_sizes[i] != 0; i++) { 1651 size_t expected = os::_page_sizes[i]; 1652 size_t actual = os::page_size_for_region_unaligned(expected, 1); 1653 assert_eq(expected, actual); 1654 } 1655 1656 // Given slightly larger size than a page size, return the page size. 1657 for (size_t i = 0; os::_page_sizes[i] != 0; i++) { 1658 size_t expected = os::_page_sizes[i]; 1659 size_t actual = os::page_size_for_region_unaligned(expected + 17, 1); 1660 assert_eq(expected, actual); 1661 } 1662 1663 // Given a slightly smaller size than a page size, 1664 // return the next smaller page size. 1665 if (os::_page_sizes[1] > os::_page_sizes[0]) { 1666 size_t expected = os::_page_sizes[0]; 1667 size_t actual = os::page_size_for_region_unaligned(os::_page_sizes[1] - 17, 1); 1668 assert_eq(actual, expected); 1669 } 1670 1671 // Return small page size for values less than a small page. 1672 size_t small_page = small_page_size(); 1673 size_t actual = os::page_size_for_region_unaligned(small_page - 17, 1); 1674 assert_eq(small_page, actual); 1675 } 1676 } 1677 1678 public: 1679 static void run_tests() { 1680 test_page_size_for_region_aligned(); 1681 test_page_size_for_region_alignment(); 1682 test_page_size_for_region_unaligned(); 1683 } 1684 }; 1685 1686 void TestOS_test() { 1687 TestOS::run_tests(); 1688 } 1689 1690 #endif // PRODUCT