1 /* 2 * Copyright (c) 1997, 2014, 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 size_t os::_page_sizes[os::page_sizes_max]; 82 83 #ifndef PRODUCT 84 julong os::num_mallocs = 0; // # of calls to malloc/realloc 85 julong os::alloc_bytes = 0; // # of bytes allocated 86 julong os::num_frees = 0; // # of calls to free 87 julong os::free_bytes = 0; // # of bytes freed 88 #endif 89 90 static juint cur_malloc_words = 0; // current size for MallocMaxTestWords 91 92 void os_init_globals() { 93 // Called from init_globals(). 94 // See Threads::create_vm() in thread.cpp, and init.cpp. 95 os::init_globals(); 96 } 97 98 // Fill in buffer with current local time as an ISO-8601 string. 99 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. 100 // Returns buffer, or NULL if it failed. 101 // This would mostly be a call to 102 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) 103 // except that on Windows the %z behaves badly, so we do it ourselves. 104 // Also, people wanted milliseconds on there, 105 // and strftime doesn't do milliseconds. 106 char* os::iso8601_time(char* buffer, size_t buffer_length) { 107 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" 108 // 1 2 109 // 12345678901234567890123456789 110 static const char* iso8601_format = 111 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d"; 112 static const size_t needed_buffer = 29; 113 114 // Sanity check the arguments 115 if (buffer == NULL) { 116 assert(false, "NULL buffer"); 117 return NULL; 118 } 119 if (buffer_length < needed_buffer) { 120 assert(false, "buffer_length too small"); 121 return NULL; 122 } 123 // Get the current time 124 jlong milliseconds_since_19700101 = javaTimeMillis(); 125 const int milliseconds_per_microsecond = 1000; 126 const time_t seconds_since_19700101 = 127 milliseconds_since_19700101 / milliseconds_per_microsecond; 128 const int milliseconds_after_second = 129 milliseconds_since_19700101 % milliseconds_per_microsecond; 130 // Convert the time value to a tm and timezone variable 131 struct tm time_struct; 132 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { 133 assert(false, "Failed localtime_pd"); 134 return NULL; 135 } 136 #if defined(_ALLBSD_SOURCE) 137 const time_t zone = (time_t) time_struct.tm_gmtoff; 138 #else 139 const time_t zone = timezone; 140 #endif 141 142 // If daylight savings time is in effect, 143 // we are 1 hour East of our time zone 144 const time_t seconds_per_minute = 60; 145 const time_t minutes_per_hour = 60; 146 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; 147 time_t UTC_to_local = zone; 148 if (time_struct.tm_isdst > 0) { 149 UTC_to_local = UTC_to_local - seconds_per_hour; 150 } 151 // Compute the time zone offset. 152 // localtime_pd() sets timezone to the difference (in seconds) 153 // between UTC and and local time. 154 // ISO 8601 says we need the difference between local time and UTC, 155 // we change the sign of the localtime_pd() result. 156 const time_t local_to_UTC = -(UTC_to_local); 157 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. 158 char sign_local_to_UTC = '+'; 159 time_t abs_local_to_UTC = local_to_UTC; 160 if (local_to_UTC < 0) { 161 sign_local_to_UTC = '-'; 162 abs_local_to_UTC = -(abs_local_to_UTC); 163 } 164 // Convert time zone offset seconds to hours and minutes. 165 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); 166 const time_t zone_min = 167 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); 168 169 // Print an ISO 8601 date and time stamp into the buffer 170 const int year = 1900 + time_struct.tm_year; 171 const int month = 1 + time_struct.tm_mon; 172 const int printed = jio_snprintf(buffer, buffer_length, iso8601_format, 173 year, 174 month, 175 time_struct.tm_mday, 176 time_struct.tm_hour, 177 time_struct.tm_min, 178 time_struct.tm_sec, 179 milliseconds_after_second, 180 sign_local_to_UTC, 181 zone_hours, 182 zone_min); 183 if (printed == 0) { 184 assert(false, "Failed jio_printf"); 185 return NULL; 186 } 187 return buffer; 188 } 189 190 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { 191 #ifdef ASSERT 192 if (!(!thread->is_Java_thread() || 193 Thread::current() == thread || 194 Threads_lock->owned_by_self() 195 || thread->is_Compiler_thread() 196 )) { 197 assert(false, "possibility of dangling Thread pointer"); 198 } 199 #endif 200 201 if (p >= MinPriority && p <= MaxPriority) { 202 int priority = java_to_os_priority[p]; 203 return set_native_priority(thread, priority); 204 } else { 205 assert(false, "Should not happen"); 206 return OS_ERR; 207 } 208 } 209 210 // The mapping from OS priority back to Java priority may be inexact because 211 // Java priorities can map M:1 with native priorities. If you want the definite 212 // Java priority then use JavaThread::java_priority() 213 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { 214 int p; 215 int os_prio; 216 OSReturn ret = get_native_priority(thread, &os_prio); 217 if (ret != OS_OK) return ret; 218 219 if (java_to_os_priority[MaxPriority] > java_to_os_priority[MinPriority]) { 220 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; 221 } else { 222 // niceness values are in reverse order 223 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] < os_prio; p--) ; 224 } 225 priority = (ThreadPriority)p; 226 return OS_OK; 227 } 228 229 230 // --------------------- sun.misc.Signal (optional) --------------------- 231 232 233 // SIGBREAK is sent by the keyboard to query the VM state 234 #ifndef SIGBREAK 235 #define SIGBREAK SIGQUIT 236 #endif 237 238 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. 239 240 241 static void signal_thread_entry(JavaThread* thread, TRAPS) { 242 os::set_priority(thread, NearMaxPriority); 243 while (true) { 244 int sig; 245 { 246 // FIXME : Currently we have not decieded what should be the status 247 // for this java thread blocked here. Once we decide about 248 // that we should fix this. 249 sig = os::signal_wait(); 250 } 251 if (sig == os::sigexitnum_pd()) { 252 // Terminate the signal thread 253 return; 254 } 255 256 switch (sig) { 257 case SIGBREAK: { 258 // Check if the signal is a trigger to start the Attach Listener - in that 259 // case don't print stack traces. 260 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { 261 continue; 262 } 263 // Print stack traces 264 // Any SIGBREAK operations added here should make sure to flush 265 // the output stream (e.g. tty->flush()) after output. See 4803766. 266 // Each module also prints an extra carriage return after its output. 267 VM_PrintThreads op; 268 VMThread::execute(&op); 269 VM_PrintJNI jni_op; 270 VMThread::execute(&jni_op); 271 VM_FindDeadlocks op1(tty); 272 VMThread::execute(&op1); 273 Universe::print_heap_at_SIGBREAK(); 274 if (PrintClassHistogram) { 275 VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */); 276 VMThread::execute(&op1); 277 } 278 if (JvmtiExport::should_post_data_dump()) { 279 JvmtiExport::post_data_dump(); 280 } 281 break; 282 } 283 default: { 284 // Dispatch the signal to java 285 HandleMark hm(THREAD); 286 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_Signal(), THREAD); 287 KlassHandle klass (THREAD, k); 288 if (klass.not_null()) { 289 JavaValue result(T_VOID); 290 JavaCallArguments args; 291 args.push_int(sig); 292 JavaCalls::call_static( 293 &result, 294 klass, 295 vmSymbols::dispatch_name(), 296 vmSymbols::int_void_signature(), 297 &args, 298 THREAD 299 ); 300 } 301 if (HAS_PENDING_EXCEPTION) { 302 // tty is initialized early so we don't expect it to be null, but 303 // if it is we can't risk doing an initialization that might 304 // trigger additional out-of-memory conditions 305 if (tty != NULL) { 306 char klass_name[256]; 307 char tmp_sig_name[16]; 308 const char* sig_name = "UNKNOWN"; 309 InstanceKlass::cast(PENDING_EXCEPTION->klass())-> 310 name()->as_klass_external_name(klass_name, 256); 311 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) 312 sig_name = tmp_sig_name; 313 warning("Exception %s occurred dispatching signal %s to handler" 314 "- the VM may need to be forcibly terminated", 315 klass_name, sig_name ); 316 } 317 CLEAR_PENDING_EXCEPTION; 318 } 319 } 320 } 321 } 322 } 323 324 void os::init_before_ergo() { 325 // We need to initialize large page support here because ergonomics takes some 326 // decisions depending on large page support and the calculated large page size. 327 large_page_init(); 328 } 329 330 void os::signal_init() { 331 if (!ReduceSignalUsage) { 332 // Setup JavaThread for processing signals 333 EXCEPTION_MARK; 334 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); 335 instanceKlassHandle klass (THREAD, k); 336 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); 337 338 const char thread_name[] = "Signal Dispatcher"; 339 Handle string = java_lang_String::create_from_str(thread_name, CHECK); 340 341 // Initialize thread_oop to put it into the system threadGroup 342 Handle thread_group (THREAD, Universe::system_thread_group()); 343 JavaValue result(T_VOID); 344 JavaCalls::call_special(&result, thread_oop, 345 klass, 346 vmSymbols::object_initializer_name(), 347 vmSymbols::threadgroup_string_void_signature(), 348 thread_group, 349 string, 350 CHECK); 351 352 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); 353 JavaCalls::call_special(&result, 354 thread_group, 355 group, 356 vmSymbols::add_method_name(), 357 vmSymbols::thread_void_signature(), 358 thread_oop, // ARG 1 359 CHECK); 360 361 os::signal_init_pd(); 362 363 { MutexLocker mu(Threads_lock); 364 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); 365 366 // At this point it may be possible that no osthread was created for the 367 // JavaThread due to lack of memory. We would have to throw an exception 368 // in that case. However, since this must work and we do not allow 369 // exceptions anyway, check and abort if this fails. 370 if (signal_thread == NULL || signal_thread->osthread() == NULL) { 371 vm_exit_during_initialization("java.lang.OutOfMemoryError", 372 "unable to create new native thread"); 373 } 374 375 java_lang_Thread::set_thread(thread_oop(), signal_thread); 376 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 377 java_lang_Thread::set_daemon(thread_oop()); 378 379 signal_thread->set_threadObj(thread_oop()); 380 Threads::add(signal_thread); 381 Thread::start(signal_thread); 382 } 383 // Handle ^BREAK 384 os::signal(SIGBREAK, os::user_handler()); 385 } 386 } 387 388 389 void os::terminate_signal_thread() { 390 if (!ReduceSignalUsage) 391 signal_notify(sigexitnum_pd()); 392 } 393 394 395 // --------------------- loading libraries --------------------- 396 397 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); 398 extern struct JavaVM_ main_vm; 399 400 static void* _native_java_library = NULL; 401 402 void* os::native_java_library() { 403 if (_native_java_library == NULL) { 404 char buffer[JVM_MAXPATHLEN]; 405 char ebuf[1024]; 406 407 // Try to load verify dll first. In 1.3 java dll depends on it and is not 408 // always able to find it when the loading executable is outside the JDK. 409 // In order to keep working with 1.2 we ignore any loading errors. 410 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), 411 "verify")) { 412 dll_load(buffer, ebuf, sizeof(ebuf)); 413 } 414 415 // Load java dll 416 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), 417 "java")) { 418 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); 419 } 420 if (_native_java_library == NULL) { 421 vm_exit_during_initialization("Unable to load native library", ebuf); 422 } 423 424 #if defined(__OpenBSD__) 425 // Work-around OpenBSD's lack of $ORIGIN support by pre-loading libnet.so 426 // ignore errors 427 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), 428 "net")) { 429 dll_load(buffer, ebuf, sizeof(ebuf)); 430 } 431 #endif 432 } 433 static jboolean onLoaded = JNI_FALSE; 434 if (onLoaded) { 435 // We may have to wait to fire OnLoad until TLS is initialized. 436 if (ThreadLocalStorage::is_initialized()) { 437 // The JNI_OnLoad handling is normally done by method load in 438 // java.lang.ClassLoader$NativeLibrary, but the VM loads the base library 439 // explicitly so we have to check for JNI_OnLoad as well 440 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; 441 JNI_OnLoad_t JNI_OnLoad = CAST_TO_FN_PTR( 442 JNI_OnLoad_t, dll_lookup(_native_java_library, onLoadSymbols[0])); 443 if (JNI_OnLoad != NULL) { 444 JavaThread* thread = JavaThread::current(); 445 ThreadToNativeFromVM ttn(thread); 446 HandleMark hm(thread); 447 jint ver = (*JNI_OnLoad)(&main_vm, NULL); 448 onLoaded = JNI_TRUE; 449 if (!Threads::is_supported_jni_version_including_1_1(ver)) { 450 vm_exit_during_initialization("Unsupported JNI version"); 451 } 452 } 453 } 454 } 455 return _native_java_library; 456 } 457 458 /* 459 * Support for finding Agent_On(Un)Load/Attach<_lib_name> if it exists. 460 * If check_lib == true then we are looking for an 461 * Agent_OnLoad_lib_name or Agent_OnAttach_lib_name function to determine if 462 * this library is statically linked into the image. 463 * If check_lib == false then we will look for the appropriate symbol in the 464 * executable if agent_lib->is_static_lib() == true or in the shared library 465 * referenced by 'handle'. 466 */ 467 void* os::find_agent_function(AgentLibrary *agent_lib, bool check_lib, 468 const char *syms[], size_t syms_len) { 469 assert(agent_lib != NULL, "sanity check"); 470 const char *lib_name; 471 void *handle = agent_lib->os_lib(); 472 void *entryName = NULL; 473 char *agent_function_name; 474 size_t i; 475 476 // If checking then use the agent name otherwise test is_static_lib() to 477 // see how to process this lookup 478 lib_name = ((check_lib || agent_lib->is_static_lib()) ? agent_lib->name() : NULL); 479 for (i = 0; i < syms_len; i++) { 480 agent_function_name = build_agent_function_name(syms[i], lib_name, agent_lib->is_absolute_path()); 481 if (agent_function_name == NULL) { 482 break; 483 } 484 entryName = dll_lookup(handle, agent_function_name); 485 FREE_C_HEAP_ARRAY(char, agent_function_name, mtThread); 486 if (entryName != NULL) { 487 break; 488 } 489 } 490 return entryName; 491 } 492 493 // See if the passed in agent is statically linked into the VM image. 494 bool os::find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], 495 size_t syms_len) { 496 void *ret; 497 void *proc_handle; 498 void *save_handle; 499 500 assert(agent_lib != NULL, "sanity check"); 501 if (agent_lib->name() == NULL) { 502 return false; 503 } 504 proc_handle = get_default_process_handle(); 505 // Check for Agent_OnLoad/Attach_lib_name function 506 save_handle = agent_lib->os_lib(); 507 // We want to look in this process' symbol table. 508 agent_lib->set_os_lib(proc_handle); 509 ret = find_agent_function(agent_lib, true, syms, syms_len); 510 if (ret != NULL) { 511 // Found an entry point like Agent_OnLoad_lib_name so we have a static agent 512 agent_lib->set_valid(); 513 agent_lib->set_static_lib(true); 514 return true; 515 } 516 agent_lib->set_os_lib(save_handle); 517 return false; 518 } 519 520 // --------------------- heap allocation utilities --------------------- 521 522 char *os::strdup(const char *str, MEMFLAGS flags) { 523 size_t size = strlen(str); 524 char *dup_str = (char *)malloc(size + 1, flags); 525 if (dup_str == NULL) return NULL; 526 strcpy(dup_str, str); 527 return dup_str; 528 } 529 530 531 532 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ 533 534 #ifdef ASSERT 535 static void verify_memory(void* ptr) { 536 GuardedMemory guarded(ptr); 537 if (!guarded.verify_guards()) { 538 tty->print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT, os::num_mallocs, os::num_frees); 539 tty->print_cr("## memory stomp:"); 540 guarded.print_on(tty); 541 fatal("memory stomping error"); 542 } 543 } 544 #endif 545 546 // 547 // This function supports testing of the malloc out of memory 548 // condition without really running the system out of memory. 549 // 550 static u_char* testMalloc(size_t alloc_size) { 551 assert(MallocMaxTestWords > 0, "sanity check"); 552 553 if ((cur_malloc_words + (alloc_size / BytesPerWord)) > MallocMaxTestWords) { 554 return NULL; 555 } 556 557 u_char* ptr = (u_char*)::malloc(alloc_size); 558 559 if (ptr != NULL) { 560 Atomic::add(((jint) (alloc_size / BytesPerWord)), 561 (volatile jint *) &cur_malloc_words); 562 } 563 return ptr; 564 } 565 566 void* os::malloc(size_t size, MEMFLAGS flags) { 567 return os::malloc(size, flags, CALLER_PC); 568 } 569 570 void* os::malloc(size_t size, MEMFLAGS memflags, const NativeCallStack& stack) { 571 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); 572 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); 573 574 #if INCLUDE_NMT 575 // NMT can not track malloc allocation size > MAX_MALLOC_SIZE, which is 576 // (1GB - 1) on 32-bit system. It is not an issue on 64-bit system, where 577 // MAX_MALLOC_SIZE = ((1 << 62) - 1). 578 // VM code does not have such large malloc allocation. However, it can come 579 // Unsafe call. 580 if (MemTracker::tracking_level() >= NMT_summary && size > MAX_MALLOC_SIZE) { 581 return NULL; 582 } 583 #endif 584 585 #ifdef ASSERT 586 // checking for the WatcherThread and crash_protection first 587 // since os::malloc can be called when the libjvm.{dll,so} is 588 // first loaded and we don't have a thread yet. 589 // try to find the thread after we see that the watcher thread 590 // exists and has crash protection. 591 WatcherThread *wt = WatcherThread::watcher_thread(); 592 if (wt != NULL && wt->has_crash_protection()) { 593 Thread* thread = ThreadLocalStorage::get_thread_slow(); 594 if (thread == wt) { 595 assert(!wt->has_crash_protection(), 596 "Can't malloc with crash protection from WatcherThread"); 597 } 598 } 599 #endif 600 601 if (size == 0) { 602 // return a valid pointer if size is zero 603 // if NULL is returned the calling functions assume out of memory. 604 size = 1; 605 } 606 607 // NMT support 608 NMT_TrackingLevel level = MemTracker::tracking_level(); 609 size_t nmt_header_size = MemTracker::malloc_header_size(level); 610 611 #ifndef ASSERT 612 const size_t alloc_size = size + nmt_header_size; 613 #else 614 const size_t alloc_size = GuardedMemory::get_total_size(size + nmt_header_size); 615 if (size + nmt_header_size > alloc_size) { // Check for rollover. 616 return NULL; 617 } 618 #endif 619 620 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); 621 622 u_char* ptr; 623 if (MallocMaxTestWords > 0) { 624 ptr = testMalloc(alloc_size); 625 } else { 626 ptr = (u_char*)::malloc(alloc_size); 627 } 628 629 #ifdef ASSERT 630 if (ptr == NULL) { 631 return NULL; 632 } 633 // Wrap memory with guard 634 GuardedMemory guarded(ptr, size + nmt_header_size); 635 ptr = guarded.get_user_ptr(); 636 #endif 637 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { 638 tty->print_cr("os::malloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); 639 breakpoint(); 640 } 641 debug_only(if (paranoid) verify_memory(ptr)); 642 if (PrintMalloc && tty != NULL) { 643 tty->print_cr("os::malloc " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); 644 } 645 646 // we do not track guard memory 647 return MemTracker::record_malloc((address)ptr, size, memflags, stack, level); 648 } 649 650 void* os::realloc(void *memblock, size_t size, MEMFLAGS flags) { 651 return os::realloc(memblock, size, flags, CALLER_PC); 652 } 653 654 void* os::realloc(void *memblock, size_t size, MEMFLAGS memflags, const NativeCallStack& stack) { 655 #if INCLUDE_NMT 656 // See comments in os::malloc() above 657 if (MemTracker::tracking_level() >= NMT_summary && size > MAX_MALLOC_SIZE) { 658 return NULL; 659 } 660 #endif 661 662 #ifndef ASSERT 663 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); 664 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); 665 // NMT support 666 void* membase = MemTracker::record_free(memblock); 667 NMT_TrackingLevel level = MemTracker::tracking_level(); 668 size_t nmt_header_size = MemTracker::malloc_header_size(level); 669 void* ptr = ::realloc(membase, size + nmt_header_size); 670 return MemTracker::record_malloc(ptr, size, memflags, stack, level); 671 #else 672 if (memblock == NULL) { 673 return os::malloc(size, memflags, stack); 674 } 675 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { 676 tty->print_cr("os::realloc caught " PTR_FORMAT, memblock); 677 breakpoint(); 678 } 679 // NMT support 680 void* membase = MemTracker::malloc_base(memblock); 681 verify_memory(membase); 682 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); 683 if (size == 0) { 684 return NULL; 685 } 686 // always move the block 687 void* ptr = os::malloc(size, memflags, stack); 688 if (PrintMalloc) { 689 tty->print_cr("os::remalloc " SIZE_FORMAT " bytes, " PTR_FORMAT " --> " PTR_FORMAT, size, memblock, ptr); 690 } 691 // Copy to new memory if malloc didn't fail 692 if ( ptr != NULL ) { 693 GuardedMemory guarded(MemTracker::malloc_base(memblock)); 694 // Guard's user data contains NMT header 695 size_t memblock_size = guarded.get_user_size() - MemTracker::malloc_header_size(memblock); 696 memcpy(ptr, memblock, MIN2(size, memblock_size)); 697 if (paranoid) verify_memory(MemTracker::malloc_base(ptr)); 698 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { 699 tty->print_cr("os::realloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); 700 breakpoint(); 701 } 702 os::free(memblock); 703 } 704 return ptr; 705 #endif 706 } 707 708 709 void os::free(void *memblock, MEMFLAGS memflags) { 710 NOT_PRODUCT(inc_stat_counter(&num_frees, 1)); 711 #ifdef ASSERT 712 if (memblock == NULL) return; 713 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { 714 if (tty != NULL) tty->print_cr("os::free caught " PTR_FORMAT, memblock); 715 breakpoint(); 716 } 717 void* membase = MemTracker::record_free(memblock); 718 verify_memory(membase); 719 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); 720 721 GuardedMemory guarded(membase); 722 size_t size = guarded.get_user_size(); 723 inc_stat_counter(&free_bytes, size); 724 membase = guarded.release_for_freeing(); 725 if (PrintMalloc && tty != NULL) { 726 fprintf(stderr, "os::free " SIZE_FORMAT " bytes --> " PTR_FORMAT "\n", size, (uintptr_t)membase); 727 } 728 ::free(membase); 729 #else 730 void* membase = MemTracker::record_free(memblock); 731 ::free(membase); 732 #endif 733 } 734 735 void os::init_random(long initval) { 736 _rand_seed = initval; 737 } 738 739 740 long os::random() { 741 /* standard, well-known linear congruential random generator with 742 * next_rand = (16807*seed) mod (2**31-1) 743 * see 744 * (1) "Random Number Generators: Good Ones Are Hard to Find", 745 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), 746 * (2) "Two Fast Implementations of the 'Minimal Standard' Random 747 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. 748 */ 749 const long a = 16807; 750 const unsigned long m = 2147483647; 751 const long q = m / a; assert(q == 127773, "weird math"); 752 const long r = m % a; assert(r == 2836, "weird math"); 753 754 // compute az=2^31p+q 755 unsigned long lo = a * (long)(_rand_seed & 0xFFFF); 756 unsigned long hi = a * (long)((unsigned long)_rand_seed >> 16); 757 lo += (hi & 0x7FFF) << 16; 758 759 // if q overflowed, ignore the overflow and increment q 760 if (lo > m) { 761 lo &= m; 762 ++lo; 763 } 764 lo += hi >> 15; 765 766 // if (p+q) overflowed, ignore the overflow and increment (p+q) 767 if (lo > m) { 768 lo &= m; 769 ++lo; 770 } 771 return (_rand_seed = lo); 772 } 773 774 // The INITIALIZED state is distinguished from the SUSPENDED state because the 775 // conditions in which a thread is first started are different from those in which 776 // a suspension is resumed. These differences make it hard for us to apply the 777 // tougher checks when starting threads that we want to do when resuming them. 778 // However, when start_thread is called as a result of Thread.start, on a Java 779 // thread, the operation is synchronized on the Java Thread object. So there 780 // cannot be a race to start the thread and hence for the thread to exit while 781 // we are working on it. Non-Java threads that start Java threads either have 782 // to do so in a context in which races are impossible, or should do appropriate 783 // locking. 784 785 void os::start_thread(Thread* thread) { 786 // guard suspend/resume 787 MutexLockerEx ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); 788 OSThread* osthread = thread->osthread(); 789 osthread->set_state(RUNNABLE); 790 pd_start_thread(thread); 791 } 792 793 //--------------------------------------------------------------------------- 794 // Helper functions for fatal error handler 795 796 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { 797 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); 798 799 int cols = 0; 800 int cols_per_line = 0; 801 switch (unitsize) { 802 case 1: cols_per_line = 16; break; 803 case 2: cols_per_line = 8; break; 804 case 4: cols_per_line = 4; break; 805 case 8: cols_per_line = 2; break; 806 default: return; 807 } 808 809 address p = start; 810 st->print(PTR_FORMAT ": ", start); 811 while (p < end) { 812 switch (unitsize) { 813 case 1: st->print("%02x", *(u1*)p); break; 814 case 2: st->print("%04x", *(u2*)p); break; 815 case 4: st->print("%08x", *(u4*)p); break; 816 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; 817 } 818 p += unitsize; 819 cols++; 820 if (cols >= cols_per_line && p < end) { 821 cols = 0; 822 st->cr(); 823 st->print(PTR_FORMAT ": ", p); 824 } else { 825 st->print(" "); 826 } 827 } 828 st->cr(); 829 } 830 831 void os::print_environment_variables(outputStream* st, const char** env_list, 832 char* buffer, int len) { 833 if (env_list) { 834 st->print_cr("Environment Variables:"); 835 836 for (int i = 0; env_list[i] != NULL; i++) { 837 if (getenv(env_list[i], buffer, len)) { 838 st->print("%s", env_list[i]); 839 st->print("="); 840 st->print_cr("%s", buffer); 841 } 842 } 843 } 844 } 845 846 void os::print_cpu_info(outputStream* st) { 847 // cpu 848 st->print("CPU:"); 849 st->print("total %d", os::processor_count()); 850 // It's not safe to query number of active processors after crash 851 // st->print("(active %d)", os::active_processor_count()); 852 st->print(" %s", VM_Version::cpu_features()); 853 st->cr(); 854 pd_print_cpu_info(st); 855 } 856 857 void os::print_date_and_time(outputStream *st) { 858 const int secs_per_day = 86400; 859 const int secs_per_hour = 3600; 860 const int secs_per_min = 60; 861 862 time_t tloc; 863 (void)time(&tloc); 864 st->print("time: %s", ctime(&tloc)); // ctime adds newline. 865 866 double t = os::elapsedTime(); 867 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in 868 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int 869 // before printf. We lost some precision, but who cares? 870 int eltime = (int)t; // elapsed time in seconds 871 872 // print elapsed time in a human-readable format: 873 int eldays = eltime / secs_per_day; 874 int day_secs = eldays * secs_per_day; 875 int elhours = (eltime - day_secs) / secs_per_hour; 876 int hour_secs = elhours * secs_per_hour; 877 int elmins = (eltime - day_secs - hour_secs) / secs_per_min; 878 int minute_secs = elmins * secs_per_min; 879 int elsecs = (eltime - day_secs - hour_secs - minute_secs); 880 st->print_cr("elapsed time: %d seconds (%dd %dh %dm %ds)", eltime, eldays, elhours, elmins, elsecs); 881 } 882 883 // moved from debug.cpp (used to be find()) but still called from there 884 // The verbose parameter is only set by the debug code in one case 885 void os::print_location(outputStream* st, intptr_t x, bool verbose) { 886 address addr = (address)x; 887 CodeBlob* b = CodeCache::find_blob_unsafe(addr); 888 if (b != NULL) { 889 if (b->is_buffer_blob()) { 890 // the interpreter is generated into a buffer blob 891 InterpreterCodelet* i = Interpreter::codelet_containing(addr); 892 if (i != NULL) { 893 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an Interpreter codelet", addr, (int)(addr - i->code_begin())); 894 i->print_on(st); 895 return; 896 } 897 if (Interpreter::contains(addr)) { 898 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code" 899 " (not bytecode specific)", addr); 900 return; 901 } 902 // 903 if (AdapterHandlerLibrary::contains(b)) { 904 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an AdapterHandler", addr, (int)(addr - b->code_begin())); 905 AdapterHandlerLibrary::print_handler_on(st, b); 906 } 907 // the stubroutines are generated into a buffer blob 908 StubCodeDesc* d = StubCodeDesc::desc_for(addr); 909 if (d != NULL) { 910 st->print_cr(INTPTR_FORMAT " is at begin+%d in a stub", addr, (int)(addr - d->begin())); 911 d->print_on(st); 912 st->cr(); 913 return; 914 } 915 if (StubRoutines::contains(addr)) { 916 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) " 917 "stub routine", addr); 918 return; 919 } 920 // the InlineCacheBuffer is using stubs generated into a buffer blob 921 if (InlineCacheBuffer::contains(addr)) { 922 st->print_cr(INTPTR_FORMAT " is pointing into InlineCacheBuffer", addr); 923 return; 924 } 925 VtableStub* v = VtableStubs::stub_containing(addr); 926 if (v != NULL) { 927 st->print_cr(INTPTR_FORMAT " is at entry_point+%d in a vtable stub", addr, (int)(addr - v->entry_point())); 928 v->print_on(st); 929 st->cr(); 930 return; 931 } 932 } 933 nmethod* nm = b->as_nmethod_or_null(); 934 if (nm != NULL) { 935 ResourceMark rm; 936 st->print(INTPTR_FORMAT " is at entry_point+%d in (nmethod*)" INTPTR_FORMAT, 937 addr, (int)(addr - nm->entry_point()), nm); 938 if (verbose) { 939 st->print(" for "); 940 nm->method()->print_value_on(st); 941 } 942 st->cr(); 943 nm->print_nmethod(verbose); 944 return; 945 } 946 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in ", addr, (int)(addr - b->code_begin())); 947 b->print_on(st); 948 return; 949 } 950 951 if (Universe::heap()->is_in(addr)) { 952 HeapWord* p = Universe::heap()->block_start(addr); 953 bool print = false; 954 // If we couldn't find it it just may mean that heap wasn't parseable 955 // See if we were just given an oop directly 956 if (p != NULL && Universe::heap()->block_is_obj(p)) { 957 print = true; 958 } else if (p == NULL && ((oopDesc*)addr)->is_oop()) { 959 p = (HeapWord*) addr; 960 print = true; 961 } 962 if (print) { 963 if (p == (HeapWord*) addr) { 964 st->print_cr(INTPTR_FORMAT " is an oop", addr); 965 } else { 966 st->print_cr(INTPTR_FORMAT " is pointing into object: " INTPTR_FORMAT, addr, p); 967 } 968 oop(p)->print_on(st); 969 return; 970 } 971 } else { 972 if (Universe::heap()->is_in_reserved(addr)) { 973 st->print_cr(INTPTR_FORMAT " is an unallocated location " 974 "in the heap", addr); 975 return; 976 } 977 } 978 if (JNIHandles::is_global_handle((jobject) addr)) { 979 st->print_cr(INTPTR_FORMAT " is a global jni handle", addr); 980 return; 981 } 982 if (JNIHandles::is_weak_global_handle((jobject) addr)) { 983 st->print_cr(INTPTR_FORMAT " is a weak global jni handle", addr); 984 return; 985 } 986 #ifndef PRODUCT 987 // we don't keep the block list in product mode 988 if (JNIHandleBlock::any_contains((jobject) addr)) { 989 st->print_cr(INTPTR_FORMAT " is a local jni handle", addr); 990 return; 991 } 992 #endif 993 994 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { 995 // Check for privilege stack 996 if (thread->privileged_stack_top() != NULL && 997 thread->privileged_stack_top()->contains(addr)) { 998 st->print_cr(INTPTR_FORMAT " is pointing into the privilege stack " 999 "for thread: " INTPTR_FORMAT, addr, thread); 1000 if (verbose) thread->print_on(st); 1001 return; 1002 } 1003 // If the addr is a java thread print information about that. 1004 if (addr == (address)thread) { 1005 if (verbose) { 1006 thread->print_on(st); 1007 } else { 1008 st->print_cr(INTPTR_FORMAT " is a thread", addr); 1009 } 1010 return; 1011 } 1012 // If the addr is in the stack region for this thread then report that 1013 // and print thread info 1014 if (thread->stack_base() >= addr && 1015 addr > (thread->stack_base() - thread->stack_size())) { 1016 st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " 1017 INTPTR_FORMAT, addr, thread); 1018 if (verbose) thread->print_on(st); 1019 return; 1020 } 1021 1022 } 1023 1024 // Check if in metaspace and print types that have vptrs (only method now) 1025 if (Metaspace::contains(addr)) { 1026 if (Method::has_method_vptr((const void*)addr)) { 1027 ((Method*)addr)->print_value_on(st); 1028 st->cr(); 1029 } else { 1030 // Use addr->print() from the debugger instead (not here) 1031 st->print_cr(INTPTR_FORMAT " is pointing into metadata", addr); 1032 } 1033 return; 1034 } 1035 1036 // Try an OS specific find 1037 if (os::find(addr, st)) { 1038 return; 1039 } 1040 1041 st->print_cr(INTPTR_FORMAT " is an unknown value", addr); 1042 } 1043 1044 // Looks like all platforms except IA64 can use the same function to check 1045 // if C stack is walkable beyond current frame. The check for fp() is not 1046 // necessary on Sparc, but it's harmless. 1047 bool os::is_first_C_frame(frame* fr) { 1048 #if (defined(IA64) && !defined(AIX)) && !defined(_WIN32) 1049 // On IA64 we have to check if the callers bsp is still valid 1050 // (i.e. within the register stack bounds). 1051 // Notice: this only works for threads created by the VM and only if 1052 // we walk the current stack!!! If we want to be able to walk 1053 // arbitrary other threads, we'll have to somehow store the thread 1054 // object in the frame. 1055 Thread *thread = Thread::current(); 1056 if ((address)fr->fp() <= 1057 thread->register_stack_base() HPUX_ONLY(+ 0x0) LINUX_ONLY(+ 0x50)) { 1058 // This check is a little hacky, because on Linux the first C 1059 // frame's ('start_thread') register stack frame starts at 1060 // "register_stack_base + 0x48" while on HPUX, the first C frame's 1061 // ('__pthread_bound_body') register stack frame seems to really 1062 // start at "register_stack_base". 1063 return true; 1064 } else { 1065 return false; 1066 } 1067 #elif defined(IA64) && defined(_WIN32) 1068 return true; 1069 #else 1070 // Load up sp, fp, sender sp and sender fp, check for reasonable values. 1071 // Check usp first, because if that's bad the other accessors may fault 1072 // on some architectures. Ditto ufp second, etc. 1073 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); 1074 // sp on amd can be 32 bit aligned. 1075 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); 1076 1077 uintptr_t usp = (uintptr_t)fr->sp(); 1078 if ((usp & sp_align_mask) != 0) return true; 1079 1080 uintptr_t ufp = (uintptr_t)fr->fp(); 1081 if ((ufp & fp_align_mask) != 0) return true; 1082 1083 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); 1084 if ((old_sp & sp_align_mask) != 0) return true; 1085 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; 1086 1087 uintptr_t old_fp = (uintptr_t)fr->link(); 1088 if ((old_fp & fp_align_mask) != 0) return true; 1089 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; 1090 1091 // stack grows downwards; if old_fp is below current fp or if the stack 1092 // frame is too large, either the stack is corrupted or fp is not saved 1093 // on stack (i.e. on x86, ebp may be used as general register). The stack 1094 // is not walkable beyond current frame. 1095 if (old_fp < ufp) return true; 1096 if (old_fp - ufp > 64 * K) return true; 1097 1098 return false; 1099 #endif 1100 } 1101 1102 #ifdef ASSERT 1103 extern "C" void test_random() { 1104 const double m = 2147483647; 1105 double mean = 0.0, variance = 0.0, t; 1106 long reps = 10000; 1107 unsigned long seed = 1; 1108 1109 tty->print_cr("seed %ld for %ld repeats...", seed, reps); 1110 os::init_random(seed); 1111 long num; 1112 for (int k = 0; k < reps; k++) { 1113 num = os::random(); 1114 double u = (double)num / m; 1115 assert(u >= 0.0 && u <= 1.0, "bad random number!"); 1116 1117 // calculate mean and variance of the random sequence 1118 mean += u; 1119 variance += (u*u); 1120 } 1121 mean /= reps; 1122 variance /= (reps - 1); 1123 1124 assert(num == 1043618065, "bad seed"); 1125 tty->print_cr("mean of the 1st 10000 numbers: %f", mean); 1126 tty->print_cr("variance of the 1st 10000 numbers: %f", variance); 1127 const double eps = 0.0001; 1128 t = fabsd(mean - 0.5018); 1129 assert(t < eps, "bad mean"); 1130 t = (variance - 0.3355) < 0.0 ? -(variance - 0.3355) : variance - 0.3355; 1131 assert(t < eps, "bad variance"); 1132 } 1133 #endif 1134 1135 1136 // Set up the boot classpath. 1137 1138 char* os::format_boot_path(const char* format_string, 1139 const char* home, 1140 int home_len, 1141 char fileSep, 1142 char pathSep) { 1143 assert((fileSep == '/' && pathSep == ':') || 1144 (fileSep == '\\' && pathSep == ';'), "unexpected seperator chars"); 1145 1146 // Scan the format string to determine the length of the actual 1147 // boot classpath, and handle platform dependencies as well. 1148 int formatted_path_len = 0; 1149 const char* p; 1150 for (p = format_string; *p != 0; ++p) { 1151 if (*p == '%') formatted_path_len += home_len - 1; 1152 ++formatted_path_len; 1153 } 1154 1155 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1, mtInternal); 1156 if (formatted_path == NULL) { 1157 return NULL; 1158 } 1159 1160 // Create boot classpath from format, substituting separator chars and 1161 // java home directory. 1162 char* q = formatted_path; 1163 for (p = format_string; *p != 0; ++p) { 1164 switch (*p) { 1165 case '%': 1166 strcpy(q, home); 1167 q += home_len; 1168 break; 1169 case '/': 1170 *q++ = fileSep; 1171 break; 1172 case ':': 1173 *q++ = pathSep; 1174 break; 1175 default: 1176 *q++ = *p; 1177 } 1178 } 1179 *q = '\0'; 1180 1181 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); 1182 return formatted_path; 1183 } 1184 1185 1186 bool os::set_boot_path(char fileSep, char pathSep) { 1187 const char* home = Arguments::get_java_home(); 1188 int home_len = (int)strlen(home); 1189 1190 static const char* meta_index_dir_format = "%/lib/"; 1191 static const char* meta_index_format = "%/lib/meta-index"; 1192 char* meta_index = format_boot_path(meta_index_format, home, home_len, fileSep, pathSep); 1193 if (meta_index == NULL) return false; 1194 char* meta_index_dir = format_boot_path(meta_index_dir_format, home, home_len, fileSep, pathSep); 1195 if (meta_index_dir == NULL) return false; 1196 Arguments::set_meta_index_path(meta_index, meta_index_dir); 1197 1198 // Any modification to the JAR-file list, for the boot classpath must be 1199 // aligned with install/install/make/common/Pack.gmk. Note: boot class 1200 // path class JARs, are stripped for StackMapTable to reduce download size. 1201 static const char classpath_format[] = 1202 "%/lib/resources.jar:" 1203 "%/lib/rt.jar:" 1204 "%/lib/sunrsasign.jar:" 1205 "%/lib/jsse.jar:" 1206 "%/lib/jce.jar:" 1207 "%/lib/charsets.jar:" 1208 "%/lib/jfr.jar:" 1209 "%/classes"; 1210 char* sysclasspath = format_boot_path(classpath_format, home, home_len, fileSep, pathSep); 1211 if (sysclasspath == NULL) return false; 1212 Arguments::set_sysclasspath(sysclasspath); 1213 1214 return true; 1215 } 1216 1217 /* 1218 * Splits a path, based on its separator, the number of 1219 * elements is returned back in n. 1220 * It is the callers responsibility to: 1221 * a> check the value of n, and n may be 0. 1222 * b> ignore any empty path elements 1223 * c> free up the data. 1224 */ 1225 char** os::split_path(const char* path, int* n) { 1226 *n = 0; 1227 if (path == NULL || strlen(path) == 0) { 1228 return NULL; 1229 } 1230 const char psepchar = *os::path_separator(); 1231 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1, mtInternal); 1232 if (inpath == NULL) { 1233 return NULL; 1234 } 1235 strcpy(inpath, path); 1236 int count = 1; 1237 char* p = strchr(inpath, psepchar); 1238 // Get a count of elements to allocate memory 1239 while (p != NULL) { 1240 count++; 1241 p++; 1242 p = strchr(p, psepchar); 1243 } 1244 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count, mtInternal); 1245 if (opath == NULL) { 1246 return NULL; 1247 } 1248 1249 // do the actual splitting 1250 p = inpath; 1251 for (int i = 0 ; i < count ; i++) { 1252 size_t len = strcspn(p, os::path_separator()); 1253 if (len > JVM_MAXPATHLEN) { 1254 return NULL; 1255 } 1256 // allocate the string and add terminator storage 1257 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 1258 if (s == NULL) { 1259 return NULL; 1260 } 1261 strncpy(s, p, len); 1262 s[len] = '\0'; 1263 opath[i] = s; 1264 p += len + 1; 1265 } 1266 FREE_C_HEAP_ARRAY(char, inpath, mtInternal); 1267 *n = count; 1268 return opath; 1269 } 1270 1271 void os::set_memory_serialize_page(address page) { 1272 int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); 1273 _mem_serialize_page = (volatile int32_t *)page; 1274 // We initialize the serialization page shift count here 1275 // We assume a cache line size of 64 bytes 1276 assert(SerializePageShiftCount == count, 1277 "thread size changed, fix SerializePageShiftCount constant"); 1278 set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t))); 1279 } 1280 1281 static volatile intptr_t SerializePageLock = 0; 1282 1283 // This method is called from signal handler when SIGSEGV occurs while the current 1284 // thread tries to store to the "read-only" memory serialize page during state 1285 // transition. 1286 void os::block_on_serialize_page_trap() { 1287 if (TraceSafepoint) { 1288 tty->print_cr("Block until the serialize page permission restored"); 1289 } 1290 // When VMThread is holding the SerializePageLock during modifying the 1291 // access permission of the memory serialize page, the following call 1292 // will block until the permission of that page is restored to rw. 1293 // Generally, it is unsafe to manipulate locks in signal handlers, but in 1294 // this case, it's OK as the signal is synchronous and we know precisely when 1295 // it can occur. 1296 Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page"); 1297 Thread::muxRelease(&SerializePageLock); 1298 } 1299 1300 // Serialize all thread state variables 1301 void os::serialize_thread_states() { 1302 // On some platforms such as Solaris & Linux, the time duration of the page 1303 // permission restoration is observed to be much longer than expected due to 1304 // scheduler starvation problem etc. To avoid the long synchronization 1305 // time and expensive page trap spinning, 'SerializePageLock' is used to block 1306 // the mutator thread if such case is encountered. See bug 6546278 for details. 1307 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); 1308 os::protect_memory((char *)os::get_memory_serialize_page(), 1309 os::vm_page_size(), MEM_PROT_READ); 1310 os::protect_memory((char *)os::get_memory_serialize_page(), 1311 os::vm_page_size(), MEM_PROT_RW); 1312 Thread::muxRelease(&SerializePageLock); 1313 } 1314 1315 // Returns true if the current stack pointer is above the stack shadow 1316 // pages, false otherwise. 1317 1318 bool os::stack_shadow_pages_available(Thread *thread, methodHandle method) { 1319 assert(StackRedPages > 0 && StackYellowPages > 0,"Sanity check"); 1320 address sp = current_stack_pointer(); 1321 // Check if we have StackShadowPages above the yellow zone. This parameter 1322 // is dependent on the depth of the maximum VM call stack possible from 1323 // the handler for stack overflow. 'instanceof' in the stack overflow 1324 // handler or a println uses at least 8k stack of VM and native code 1325 // respectively. 1326 const int framesize_in_bytes = 1327 Interpreter::size_top_interpreter_activation(method()) * wordSize; 1328 int reserved_area = ((StackShadowPages + StackRedPages + StackYellowPages) 1329 * vm_page_size()) + framesize_in_bytes; 1330 // The very lower end of the stack 1331 address stack_limit = thread->stack_base() - thread->stack_size(); 1332 return (sp > (stack_limit + reserved_area)); 1333 } 1334 1335 size_t os::page_size_for_region(size_t region_min_size, size_t region_max_size, 1336 uint min_pages) 1337 { 1338 assert(min_pages > 0, "sanity"); 1339 if (UseLargePages) { 1340 const size_t max_page_size = region_max_size / min_pages; 1341 1342 for (unsigned int i = 0; _page_sizes[i] != 0; ++i) { 1343 const size_t sz = _page_sizes[i]; 1344 const size_t mask = sz - 1; 1345 if ((region_min_size & mask) == 0 && (region_max_size & mask) == 0) { 1346 // The largest page size with no fragmentation. 1347 return sz; 1348 } 1349 1350 if (sz <= max_page_size) { 1351 // The largest page size that satisfies the min_pages requirement. 1352 return sz; 1353 } 1354 } 1355 } 1356 1357 return vm_page_size(); 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::SuspendedThreadTask::run() { 1434 assert(Threads_lock->owned_by_self() || (_thread == VMThread::vm_thread()), "must have threads lock to call this"); 1435 internal_do_task(); 1436 _done = true; 1437 } 1438 1439 bool os::create_stack_guard_pages(char* addr, size_t bytes) { 1440 return os::pd_create_stack_guard_pages(addr, bytes); 1441 } 1442 1443 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 1444 char* result = pd_reserve_memory(bytes, addr, alignment_hint); 1445 if (result != NULL) { 1446 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1447 } 1448 1449 return result; 1450 } 1451 1452 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint, 1453 MEMFLAGS flags) { 1454 char* result = pd_reserve_memory(bytes, addr, alignment_hint); 1455 if (result != NULL) { 1456 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1457 MemTracker::record_virtual_memory_type((address)result, flags); 1458 } 1459 1460 return result; 1461 } 1462 1463 char* os::attempt_reserve_memory_at(size_t bytes, char* addr) { 1464 char* result = pd_attempt_reserve_memory_at(bytes, addr); 1465 if (result != NULL) { 1466 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1467 } 1468 return result; 1469 } 1470 1471 void os::split_reserved_memory(char *base, size_t size, 1472 size_t split, bool realloc) { 1473 pd_split_reserved_memory(base, size, split, realloc); 1474 } 1475 1476 bool os::commit_memory(char* addr, size_t bytes, bool executable) { 1477 bool res = pd_commit_memory(addr, bytes, executable); 1478 if (res) { 1479 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); 1480 } 1481 return res; 1482 } 1483 1484 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, 1485 bool executable) { 1486 bool res = os::pd_commit_memory(addr, size, alignment_hint, executable); 1487 if (res) { 1488 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); 1489 } 1490 return res; 1491 } 1492 1493 void os::commit_memory_or_exit(char* addr, size_t bytes, bool executable, 1494 const char* mesg) { 1495 pd_commit_memory_or_exit(addr, bytes, executable, mesg); 1496 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); 1497 } 1498 1499 void os::commit_memory_or_exit(char* addr, size_t size, size_t alignment_hint, 1500 bool executable, const char* mesg) { 1501 os::pd_commit_memory_or_exit(addr, size, alignment_hint, executable, mesg); 1502 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); 1503 } 1504 1505 bool os::uncommit_memory(char* addr, size_t bytes) { 1506 bool res; 1507 if (MemTracker::tracking_level() > NMT_minimal) { 1508 Tracker tkr = MemTracker::get_virtual_memory_uncommit_tracker(); 1509 res = pd_uncommit_memory(addr, bytes); 1510 if (res) { 1511 tkr.record((address)addr, bytes); 1512 } 1513 } else { 1514 res = pd_uncommit_memory(addr, bytes); 1515 } 1516 return res; 1517 } 1518 1519 bool os::release_memory(char* addr, size_t bytes) { 1520 bool res; 1521 if (MemTracker::tracking_level() > NMT_minimal) { 1522 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 1523 res = pd_release_memory(addr, bytes); 1524 if (res) { 1525 tkr.record((address)addr, bytes); 1526 } 1527 } else { 1528 res = pd_release_memory(addr, bytes); 1529 } 1530 return res; 1531 } 1532 1533 1534 char* os::map_memory(int fd, const char* file_name, size_t file_offset, 1535 char *addr, size_t bytes, bool read_only, 1536 bool allow_exec) { 1537 char* result = pd_map_memory(fd, file_name, file_offset, addr, bytes, read_only, allow_exec); 1538 if (result != NULL) { 1539 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, CALLER_PC); 1540 } 1541 return result; 1542 } 1543 1544 char* os::remap_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 return pd_remap_memory(fd, file_name, file_offset, addr, bytes, 1548 read_only, allow_exec); 1549 } 1550 1551 bool os::unmap_memory(char *addr, size_t bytes) { 1552 bool result; 1553 if (MemTracker::tracking_level() > NMT_minimal) { 1554 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 1555 result = pd_unmap_memory(addr, bytes); 1556 if (result) { 1557 tkr.record((address)addr, bytes); 1558 } 1559 } else { 1560 result = pd_unmap_memory(addr, bytes); 1561 } 1562 return result; 1563 } 1564 1565 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { 1566 pd_free_memory(addr, bytes, alignment_hint); 1567 } 1568 1569 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 1570 pd_realign_memory(addr, bytes, alignment_hint); 1571 } 1572 1573 #ifndef TARGET_OS_FAMILY_windows 1574 /* try to switch state from state "from" to state "to" 1575 * returns the state set after the method is complete 1576 */ 1577 os::SuspendResume::State os::SuspendResume::switch_state(os::SuspendResume::State from, 1578 os::SuspendResume::State to) 1579 { 1580 os::SuspendResume::State result = 1581 (os::SuspendResume::State) Atomic::cmpxchg((jint) to, (jint *) &_state, (jint) from); 1582 if (result == from) { 1583 // success 1584 return to; 1585 } 1586 return result; 1587 } 1588 #endif