1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/javaClasses.hpp" 29 #include "classfile/moduleEntry.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/codeCache.hpp" 33 #include "code/icBuffer.hpp" 34 #include "code/vtableStubs.hpp" 35 #include "gc/shared/gcVMOperations.hpp" 36 #include "logging/log.hpp" 37 #include "interpreter/interpreter.hpp" 38 #include "logging/log.hpp" 39 #include "logging/logStream.hpp" 40 #include "memory/allocation.inline.hpp" 41 #include "memory/guardedMemory.hpp" 42 #include "memory/resourceArea.hpp" 43 #include "memory/universe.hpp" 44 #include "oops/compressedOops.inline.hpp" 45 #include "oops/oop.inline.hpp" 46 #include "prims/jvm_misc.hpp" 47 #include "runtime/arguments.hpp" 48 #include "runtime/atomic.hpp" 49 #include "runtime/frame.inline.hpp" 50 #include "runtime/handles.inline.hpp" 51 #include "runtime/interfaceSupport.inline.hpp" 52 #include "runtime/java.hpp" 53 #include "runtime/javaCalls.hpp" 54 #include "runtime/mutexLocker.hpp" 55 #include "runtime/os.inline.hpp" 56 #include "runtime/sharedRuntime.hpp" 57 #include "runtime/stubRoutines.hpp" 58 #include "runtime/thread.inline.hpp" 59 #include "runtime/threadSMR.hpp" 60 #include "runtime/vm_version.hpp" 61 #include "services/attachListener.hpp" 62 #include "services/mallocTracker.hpp" 63 #include "services/memTracker.hpp" 64 #include "services/nmtCommon.hpp" 65 #include "services/threadService.hpp" 66 #include "utilities/align.hpp" 67 #include "utilities/defaultStream.hpp" 68 #include "utilities/events.hpp" 69 70 # include <signal.h> 71 # include <errno.h> 72 73 OSThread* os::_starting_thread = NULL; 74 address os::_polling_page = NULL; 75 volatile unsigned int os::_rand_seed = 1; 76 int os::_processor_count = 0; 77 int os::_initial_active_processor_count = 0; 78 size_t os::_page_sizes[os::page_sizes_max]; 79 80 #ifndef PRODUCT 81 julong os::num_mallocs = 0; // # of calls to malloc/realloc 82 julong os::alloc_bytes = 0; // # of bytes allocated 83 julong os::num_frees = 0; // # of calls to free 84 julong os::free_bytes = 0; // # of bytes freed 85 #endif 86 87 static size_t cur_malloc_words = 0; // current size for MallocMaxTestWords 88 89 DEBUG_ONLY(bool os::_mutex_init_done = false;) 90 91 void os_init_globals() { 92 // Called from init_globals(). 93 // See Threads::create_vm() in thread.cpp, and init.cpp. 94 os::init_globals(); 95 } 96 97 static time_t get_timezone(const struct tm* time_struct) { 98 #if defined(_ALLBSD_SOURCE) 99 return time_struct->tm_gmtoff; 100 #elif defined(_WINDOWS) 101 long zone; 102 _get_timezone(&zone); 103 return static_cast<time_t>(zone); 104 #else 105 return timezone; 106 #endif 107 } 108 109 int os::snprintf(char* buf, size_t len, const char* fmt, ...) { 110 va_list args; 111 va_start(args, fmt); 112 int result = os::vsnprintf(buf, len, fmt, args); 113 va_end(args); 114 return result; 115 } 116 117 // Fill in buffer with current local time as an ISO-8601 string. 118 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. 119 // Returns buffer, or NULL if it failed. 120 // This would mostly be a call to 121 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) 122 // except that on Windows the %z behaves badly, so we do it ourselves. 123 // Also, people wanted milliseconds on there, 124 // and strftime doesn't do milliseconds. 125 char* os::iso8601_time(char* buffer, size_t buffer_length, bool utc) { 126 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" 127 // 1 2 128 // 12345678901234567890123456789 129 // format string: "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d" 130 static const size_t needed_buffer = 29; 131 132 // Sanity check the arguments 133 if (buffer == NULL) { 134 assert(false, "NULL buffer"); 135 return NULL; 136 } 137 if (buffer_length < needed_buffer) { 138 assert(false, "buffer_length too small"); 139 return NULL; 140 } 141 // Get the current time 142 jlong milliseconds_since_19700101 = javaTimeMillis(); 143 const int milliseconds_per_microsecond = 1000; 144 const time_t seconds_since_19700101 = 145 milliseconds_since_19700101 / milliseconds_per_microsecond; 146 const int milliseconds_after_second = 147 milliseconds_since_19700101 % milliseconds_per_microsecond; 148 // Convert the time value to a tm and timezone variable 149 struct tm time_struct; 150 if (utc) { 151 if (gmtime_pd(&seconds_since_19700101, &time_struct) == NULL) { 152 assert(false, "Failed gmtime_pd"); 153 return NULL; 154 } 155 } else { 156 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { 157 assert(false, "Failed localtime_pd"); 158 return NULL; 159 } 160 } 161 const time_t zone = get_timezone(&time_struct); 162 163 // If daylight savings time is in effect, 164 // we are 1 hour East of our time zone 165 const time_t seconds_per_minute = 60; 166 const time_t minutes_per_hour = 60; 167 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; 168 time_t UTC_to_local = zone; 169 if (time_struct.tm_isdst > 0) { 170 UTC_to_local = UTC_to_local - seconds_per_hour; 171 } 172 173 // No offset when dealing with UTC 174 if (utc) { 175 UTC_to_local = 0; 176 } 177 178 // Compute the time zone offset. 179 // localtime_pd() sets timezone to the difference (in seconds) 180 // between UTC and and local time. 181 // ISO 8601 says we need the difference between local time and UTC, 182 // we change the sign of the localtime_pd() result. 183 const time_t local_to_UTC = -(UTC_to_local); 184 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. 185 char sign_local_to_UTC = '+'; 186 time_t abs_local_to_UTC = local_to_UTC; 187 if (local_to_UTC < 0) { 188 sign_local_to_UTC = '-'; 189 abs_local_to_UTC = -(abs_local_to_UTC); 190 } 191 // Convert time zone offset seconds to hours and minutes. 192 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); 193 const time_t zone_min = 194 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); 195 196 // Print an ISO 8601 date and time stamp into the buffer 197 const int year = 1900 + time_struct.tm_year; 198 const int month = 1 + time_struct.tm_mon; 199 const int printed = jio_snprintf(buffer, buffer_length, 200 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d", 201 year, 202 month, 203 time_struct.tm_mday, 204 time_struct.tm_hour, 205 time_struct.tm_min, 206 time_struct.tm_sec, 207 milliseconds_after_second, 208 sign_local_to_UTC, 209 zone_hours, 210 zone_min); 211 if (printed == 0) { 212 assert(false, "Failed jio_printf"); 213 return NULL; 214 } 215 return buffer; 216 } 217 218 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { 219 debug_only(Thread::check_for_dangling_thread_pointer(thread);) 220 221 if ((p >= MinPriority && p <= MaxPriority) || 222 (p == CriticalPriority && thread->is_ConcurrentGC_thread())) { 223 int priority = java_to_os_priority[p]; 224 return set_native_priority(thread, priority); 225 } else { 226 assert(false, "Should not happen"); 227 return OS_ERR; 228 } 229 } 230 231 // The mapping from OS priority back to Java priority may be inexact because 232 // Java priorities can map M:1 with native priorities. If you want the definite 233 // Java priority then use JavaThread::java_priority() 234 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { 235 int p; 236 int os_prio; 237 OSReturn ret = get_native_priority(thread, &os_prio); 238 if (ret != OS_OK) return ret; 239 240 if (java_to_os_priority[MaxPriority] > java_to_os_priority[MinPriority]) { 241 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; 242 } else { 243 // niceness values are in reverse order 244 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] < os_prio; p--) ; 245 } 246 priority = (ThreadPriority)p; 247 return OS_OK; 248 } 249 250 bool os::dll_build_name(char* buffer, size_t size, const char* fname) { 251 int n = jio_snprintf(buffer, size, "%s%s%s", JNI_LIB_PREFIX, fname, JNI_LIB_SUFFIX); 252 return (n != -1); 253 } 254 255 #if !defined(LINUX) && !defined(_WINDOWS) 256 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) { 257 committed_start = start; 258 committed_size = size; 259 return true; 260 } 261 #endif 262 263 // Helper for dll_locate_lib. 264 // Pass buffer and printbuffer as we already printed the path to buffer 265 // when we called get_current_directory. This way we avoid another buffer 266 // of size MAX_PATH. 267 static bool conc_path_file_and_check(char *buffer, char *printbuffer, size_t printbuflen, 268 const char* pname, char lastchar, const char* fname) { 269 270 // Concatenate path and file name, but don't print double path separators. 271 const char *filesep = (WINDOWS_ONLY(lastchar == ':' ||) lastchar == os::file_separator()[0]) ? 272 "" : os::file_separator(); 273 int ret = jio_snprintf(printbuffer, printbuflen, "%s%s%s", pname, filesep, fname); 274 // Check whether file exists. 275 if (ret != -1) { 276 struct stat statbuf; 277 return os::stat(buffer, &statbuf) == 0; 278 } 279 return false; 280 } 281 282 bool os::dll_locate_lib(char *buffer, size_t buflen, 283 const char* pname, const char* fname) { 284 bool retval = false; 285 286 size_t fullfnamelen = strlen(JNI_LIB_PREFIX) + strlen(fname) + strlen(JNI_LIB_SUFFIX); 287 char* fullfname = (char*)NEW_C_HEAP_ARRAY(char, fullfnamelen + 1, mtInternal); 288 if (dll_build_name(fullfname, fullfnamelen + 1, fname)) { 289 const size_t pnamelen = pname ? strlen(pname) : 0; 290 291 if (pnamelen == 0) { 292 // If no path given, use current working directory. 293 const char* p = get_current_directory(buffer, buflen); 294 if (p != NULL) { 295 const size_t plen = strlen(buffer); 296 const char lastchar = buffer[plen - 1]; 297 retval = conc_path_file_and_check(buffer, &buffer[plen], buflen - plen, 298 "", lastchar, fullfname); 299 } 300 } else if (strchr(pname, *os::path_separator()) != NULL) { 301 // A list of paths. Search for the path that contains the library. 302 int n; 303 char** pelements = split_path(pname, &n); 304 if (pelements != NULL) { 305 for (int i = 0; i < n; i++) { 306 char* path = pelements[i]; 307 // Really shouldn't be NULL, but check can't hurt. 308 size_t plen = (path == NULL) ? 0 : strlen(path); 309 if (plen == 0) { 310 continue; // Skip the empty path values. 311 } 312 const char lastchar = path[plen - 1]; 313 retval = conc_path_file_and_check(buffer, buffer, buflen, path, lastchar, fullfname); 314 if (retval) break; 315 } 316 // Release the storage allocated by split_path. 317 for (int i = 0; i < n; i++) { 318 if (pelements[i] != NULL) { 319 FREE_C_HEAP_ARRAY(char, pelements[i]); 320 } 321 } 322 FREE_C_HEAP_ARRAY(char*, pelements); 323 } 324 } else { 325 // A definite path. 326 const char lastchar = pname[pnamelen-1]; 327 retval = conc_path_file_and_check(buffer, buffer, buflen, pname, lastchar, fullfname); 328 } 329 } 330 331 FREE_C_HEAP_ARRAY(char*, fullfname); 332 return retval; 333 } 334 335 // --------------------- sun.misc.Signal (optional) --------------------- 336 337 338 // SIGBREAK is sent by the keyboard to query the VM state 339 #ifndef SIGBREAK 340 #define SIGBREAK SIGQUIT 341 #endif 342 343 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. 344 345 346 static void signal_thread_entry(JavaThread* thread, TRAPS) { 347 os::set_priority(thread, NearMaxPriority); 348 while (true) { 349 int sig; 350 { 351 // FIXME : Currently we have not decided what should be the status 352 // for this java thread blocked here. Once we decide about 353 // that we should fix this. 354 sig = os::signal_wait(); 355 } 356 if (sig == os::sigexitnum_pd()) { 357 // Terminate the signal thread 358 return; 359 } 360 361 switch (sig) { 362 case SIGBREAK: { 363 // Check if the signal is a trigger to start the Attach Listener - in that 364 // case don't print stack traces. 365 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { 366 continue; 367 } 368 // Print stack traces 369 // Any SIGBREAK operations added here should make sure to flush 370 // the output stream (e.g. tty->flush()) after output. See 4803766. 371 // Each module also prints an extra carriage return after its output. 372 VM_PrintThreads op; 373 VMThread::execute(&op); 374 VM_PrintJNI jni_op; 375 VMThread::execute(&jni_op); 376 VM_FindDeadlocks op1(tty); 377 VMThread::execute(&op1); 378 Universe::print_heap_at_SIGBREAK(); 379 if (PrintClassHistogram) { 380 VM_GC_HeapInspection op1(tty, true /* force full GC before heap inspection */); 381 VMThread::execute(&op1); 382 } 383 if (JvmtiExport::should_post_data_dump()) { 384 JvmtiExport::post_data_dump(); 385 } 386 break; 387 } 388 default: { 389 // Dispatch the signal to java 390 HandleMark hm(THREAD); 391 Klass* klass = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_misc_Signal(), THREAD); 392 if (klass != NULL) { 393 JavaValue result(T_VOID); 394 JavaCallArguments args; 395 args.push_int(sig); 396 JavaCalls::call_static( 397 &result, 398 klass, 399 vmSymbols::dispatch_name(), 400 vmSymbols::int_void_signature(), 401 &args, 402 THREAD 403 ); 404 } 405 if (HAS_PENDING_EXCEPTION) { 406 // tty is initialized early so we don't expect it to be null, but 407 // if it is we can't risk doing an initialization that might 408 // trigger additional out-of-memory conditions 409 if (tty != NULL) { 410 char klass_name[256]; 411 char tmp_sig_name[16]; 412 const char* sig_name = "UNKNOWN"; 413 InstanceKlass::cast(PENDING_EXCEPTION->klass())-> 414 name()->as_klass_external_name(klass_name, 256); 415 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) 416 sig_name = tmp_sig_name; 417 warning("Exception %s occurred dispatching signal %s to handler" 418 "- the VM may need to be forcibly terminated", 419 klass_name, sig_name ); 420 } 421 CLEAR_PENDING_EXCEPTION; 422 } 423 } 424 } 425 } 426 } 427 428 void os::init_before_ergo() { 429 initialize_initial_active_processor_count(); 430 // We need to initialize large page support here because ergonomics takes some 431 // decisions depending on large page support and the calculated large page size. 432 large_page_init(); 433 434 // We need to adapt the configured number of stack protection pages given 435 // in 4K pages to the actual os page size. We must do this before setting 436 // up minimal stack sizes etc. in os::init_2(). 437 JavaThread::set_stack_red_zone_size (align_up(StackRedPages * 4 * K, vm_page_size())); 438 JavaThread::set_stack_yellow_zone_size (align_up(StackYellowPages * 4 * K, vm_page_size())); 439 JavaThread::set_stack_reserved_zone_size(align_up(StackReservedPages * 4 * K, vm_page_size())); 440 JavaThread::set_stack_shadow_zone_size (align_up(StackShadowPages * 4 * K, vm_page_size())); 441 442 // VM version initialization identifies some characteristics of the 443 // platform that are used during ergonomic decisions. 444 VM_Version::init_before_ergo(); 445 } 446 447 void os::initialize_jdk_signal_support(TRAPS) { 448 if (!ReduceSignalUsage) { 449 // Setup JavaThread for processing signals 450 const char thread_name[] = "Signal Dispatcher"; 451 Handle string = java_lang_String::create_from_str(thread_name, CHECK); 452 453 // Initialize thread_oop to put it into the system threadGroup 454 Handle thread_group (THREAD, Universe::system_thread_group()); 455 Handle thread_oop = JavaCalls::construct_new_instance(SystemDictionary::Thread_klass(), 456 vmSymbols::threadgroup_string_void_signature(), 457 thread_group, 458 string, 459 CHECK); 460 461 Klass* group = SystemDictionary::ThreadGroup_klass(); 462 JavaValue result(T_VOID); 463 JavaCalls::call_special(&result, 464 thread_group, 465 group, 466 vmSymbols::add_method_name(), 467 vmSymbols::thread_void_signature(), 468 thread_oop, 469 CHECK); 470 471 { MutexLocker mu(Threads_lock); 472 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); 473 474 // At this point it may be possible that no osthread was created for the 475 // JavaThread due to lack of memory. We would have to throw an exception 476 // in that case. However, since this must work and we do not allow 477 // exceptions anyway, check and abort if this fails. 478 if (signal_thread == NULL || signal_thread->osthread() == NULL) { 479 vm_exit_during_initialization("java.lang.OutOfMemoryError", 480 os::native_thread_creation_failed_msg()); 481 } 482 483 java_lang_Thread::set_thread(thread_oop(), signal_thread); 484 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 485 java_lang_Thread::set_daemon(thread_oop()); 486 487 signal_thread->set_threadObj(thread_oop()); 488 Threads::add(signal_thread); 489 Thread::start(signal_thread); 490 } 491 // Handle ^BREAK 492 os::signal(SIGBREAK, os::user_handler()); 493 } 494 } 495 496 497 void os::terminate_signal_thread() { 498 if (!ReduceSignalUsage) 499 signal_notify(sigexitnum_pd()); 500 } 501 502 503 // --------------------- loading libraries --------------------- 504 505 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); 506 extern struct JavaVM_ main_vm; 507 508 static void* _native_java_library = NULL; 509 510 void* os::native_java_library() { 511 if (_native_java_library == NULL) { 512 char buffer[JVM_MAXPATHLEN]; 513 char ebuf[1024]; 514 515 // Try to load verify dll first. In 1.3 java dll depends on it and is not 516 // always able to find it when the loading executable is outside the JDK. 517 // In order to keep working with 1.2 we ignore any loading errors. 518 if (dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), 519 "verify")) { 520 dll_load(buffer, ebuf, sizeof(ebuf)); 521 } 522 523 // Load java dll 524 if (dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), 525 "java")) { 526 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); 527 } 528 if (_native_java_library == NULL) { 529 vm_exit_during_initialization("Unable to load native library", ebuf); 530 } 531 532 #if defined(__OpenBSD__) 533 // Work-around OpenBSD's lack of $ORIGIN support by pre-loading libnet.so 534 // ignore errors 535 if (dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), 536 "net")) { 537 dll_load(buffer, ebuf, sizeof(ebuf)); 538 } 539 #endif 540 } 541 return _native_java_library; 542 } 543 544 /* 545 * Support for finding Agent_On(Un)Load/Attach<_lib_name> if it exists. 546 * If check_lib == true then we are looking for an 547 * Agent_OnLoad_lib_name or Agent_OnAttach_lib_name function to determine if 548 * this library is statically linked into the image. 549 * If check_lib == false then we will look for the appropriate symbol in the 550 * executable if agent_lib->is_static_lib() == true or in the shared library 551 * referenced by 'handle'. 552 */ 553 void* os::find_agent_function(AgentLibrary *agent_lib, bool check_lib, 554 const char *syms[], size_t syms_len) { 555 assert(agent_lib != NULL, "sanity check"); 556 const char *lib_name; 557 void *handle = agent_lib->os_lib(); 558 void *entryName = NULL; 559 char *agent_function_name; 560 size_t i; 561 562 // If checking then use the agent name otherwise test is_static_lib() to 563 // see how to process this lookup 564 lib_name = ((check_lib || agent_lib->is_static_lib()) ? agent_lib->name() : NULL); 565 for (i = 0; i < syms_len; i++) { 566 agent_function_name = build_agent_function_name(syms[i], lib_name, agent_lib->is_absolute_path()); 567 if (agent_function_name == NULL) { 568 break; 569 } 570 entryName = dll_lookup(handle, agent_function_name); 571 FREE_C_HEAP_ARRAY(char, agent_function_name); 572 if (entryName != NULL) { 573 break; 574 } 575 } 576 return entryName; 577 } 578 579 // See if the passed in agent is statically linked into the VM image. 580 bool os::find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], 581 size_t syms_len) { 582 void *ret; 583 void *proc_handle; 584 void *save_handle; 585 586 assert(agent_lib != NULL, "sanity check"); 587 if (agent_lib->name() == NULL) { 588 return false; 589 } 590 proc_handle = get_default_process_handle(); 591 // Check for Agent_OnLoad/Attach_lib_name function 592 save_handle = agent_lib->os_lib(); 593 // We want to look in this process' symbol table. 594 agent_lib->set_os_lib(proc_handle); 595 ret = find_agent_function(agent_lib, true, syms, syms_len); 596 if (ret != NULL) { 597 // Found an entry point like Agent_OnLoad_lib_name so we have a static agent 598 agent_lib->set_valid(); 599 agent_lib->set_static_lib(true); 600 return true; 601 } 602 agent_lib->set_os_lib(save_handle); 603 return false; 604 } 605 606 // --------------------- heap allocation utilities --------------------- 607 608 char *os::strdup(const char *str, MEMFLAGS flags) { 609 size_t size = strlen(str); 610 char *dup_str = (char *)malloc(size + 1, flags); 611 if (dup_str == NULL) return NULL; 612 strcpy(dup_str, str); 613 return dup_str; 614 } 615 616 char* os::strdup_check_oom(const char* str, MEMFLAGS flags) { 617 char* p = os::strdup(str, flags); 618 if (p == NULL) { 619 vm_exit_out_of_memory(strlen(str) + 1, OOM_MALLOC_ERROR, "os::strdup_check_oom"); 620 } 621 return p; 622 } 623 624 625 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ 626 627 #ifdef ASSERT 628 629 static void verify_memory(void* ptr) { 630 GuardedMemory guarded(ptr); 631 if (!guarded.verify_guards()) { 632 LogTarget(Warning, malloc, free) lt; 633 ResourceMark rm; 634 LogStream ls(lt); 635 ls.print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT, os::num_mallocs, os::num_frees); 636 ls.print_cr("## memory stomp:"); 637 guarded.print_on(&ls); 638 fatal("memory stomping error"); 639 } 640 } 641 642 #endif 643 644 // 645 // This function supports testing of the malloc out of memory 646 // condition without really running the system out of memory. 647 // 648 static bool has_reached_max_malloc_test_peak(size_t alloc_size) { 649 if (MallocMaxTestWords > 0) { 650 size_t words = (alloc_size / BytesPerWord); 651 652 if ((cur_malloc_words + words) > MallocMaxTestWords) { 653 return true; 654 } 655 Atomic::add(words, &cur_malloc_words); 656 } 657 return false; 658 } 659 660 void* os::malloc(size_t size, MEMFLAGS flags) { 661 return os::malloc(size, flags, CALLER_PC); 662 } 663 664 void* os::malloc(size_t size, MEMFLAGS memflags, const NativeCallStack& stack) { 665 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); 666 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); 667 668 // Since os::malloc can be called when the libjvm.{dll,so} is 669 // first loaded and we don't have a thread yet we must accept NULL also here. 670 assert(!os::ThreadCrashProtection::is_crash_protected(Thread::current_or_null()), 671 "malloc() not allowed when crash protection is set"); 672 673 if (size == 0) { 674 // return a valid pointer if size is zero 675 // if NULL is returned the calling functions assume out of memory. 676 size = 1; 677 } 678 679 // NMT support 680 NMT_TrackingLevel level = MemTracker::tracking_level(); 681 size_t nmt_header_size = MemTracker::malloc_header_size(level); 682 683 #ifndef ASSERT 684 const size_t alloc_size = size + nmt_header_size; 685 #else 686 const size_t alloc_size = GuardedMemory::get_total_size(size + nmt_header_size); 687 if (size + nmt_header_size > alloc_size) { // Check for rollover. 688 return NULL; 689 } 690 #endif 691 692 // For the test flag -XX:MallocMaxTestWords 693 if (has_reached_max_malloc_test_peak(size)) { 694 return NULL; 695 } 696 697 u_char* ptr; 698 ptr = (u_char*)::malloc(alloc_size); 699 700 #ifdef ASSERT 701 if (ptr == NULL) { 702 return NULL; 703 } 704 // Wrap memory with guard 705 GuardedMemory guarded(ptr, size + nmt_header_size); 706 ptr = guarded.get_user_ptr(); 707 708 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { 709 log_warning(malloc, free)("os::malloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, p2i(ptr)); 710 breakpoint(); 711 } 712 if (paranoid) { 713 verify_memory(ptr); 714 } 715 #endif 716 717 // we do not track guard memory 718 return MemTracker::record_malloc((address)ptr, size, memflags, stack, level); 719 } 720 721 void* os::realloc(void *memblock, size_t size, MEMFLAGS flags) { 722 return os::realloc(memblock, size, flags, CALLER_PC); 723 } 724 725 void* os::realloc(void *memblock, size_t size, MEMFLAGS memflags, const NativeCallStack& stack) { 726 727 // For the test flag -XX:MallocMaxTestWords 728 if (has_reached_max_malloc_test_peak(size)) { 729 return NULL; 730 } 731 732 if (size == 0) { 733 // return a valid pointer if size is zero 734 // if NULL is returned the calling functions assume out of memory. 735 size = 1; 736 } 737 738 #ifndef ASSERT 739 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); 740 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); 741 // NMT support 742 void* membase = MemTracker::record_free(memblock); 743 NMT_TrackingLevel level = MemTracker::tracking_level(); 744 size_t nmt_header_size = MemTracker::malloc_header_size(level); 745 void* ptr = ::realloc(membase, size + nmt_header_size); 746 return MemTracker::record_malloc(ptr, size, memflags, stack, level); 747 #else 748 if (memblock == NULL) { 749 return os::malloc(size, memflags, stack); 750 } 751 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { 752 log_warning(malloc, free)("os::realloc caught " PTR_FORMAT, p2i(memblock)); 753 breakpoint(); 754 } 755 // NMT support 756 void* membase = MemTracker::malloc_base(memblock); 757 verify_memory(membase); 758 // always move the block 759 void* ptr = os::malloc(size, memflags, stack); 760 // Copy to new memory if malloc didn't fail 761 if (ptr != NULL ) { 762 GuardedMemory guarded(MemTracker::malloc_base(memblock)); 763 // Guard's user data contains NMT header 764 size_t memblock_size = guarded.get_user_size() - MemTracker::malloc_header_size(memblock); 765 memcpy(ptr, memblock, MIN2(size, memblock_size)); 766 if (paranoid) { 767 verify_memory(MemTracker::malloc_base(ptr)); 768 } 769 os::free(memblock); 770 } 771 return ptr; 772 #endif 773 } 774 775 776 void os::free(void *memblock) { 777 NOT_PRODUCT(inc_stat_counter(&num_frees, 1)); 778 #ifdef ASSERT 779 if (memblock == NULL) return; 780 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { 781 log_warning(malloc, free)("os::free caught " PTR_FORMAT, p2i(memblock)); 782 breakpoint(); 783 } 784 void* membase = MemTracker::record_free(memblock); 785 verify_memory(membase); 786 787 GuardedMemory guarded(membase); 788 size_t size = guarded.get_user_size(); 789 inc_stat_counter(&free_bytes, size); 790 membase = guarded.release_for_freeing(); 791 ::free(membase); 792 #else 793 void* membase = MemTracker::record_free(memblock); 794 ::free(membase); 795 #endif 796 } 797 798 static void* p_nestegg = NULL; 799 bool os::init_nestegg(size_t size) { 800 p_nestegg = os::malloc(size, mtInternal); 801 return p_nestegg != NULL; 802 } 803 804 void os::release_nestegg() { 805 os::free(p_nestegg); 806 p_nestegg = NULL; 807 } 808 809 void os::init_random(unsigned int initval) { 810 _rand_seed = initval; 811 } 812 813 814 static int random_helper(unsigned int rand_seed) { 815 /* standard, well-known linear congruential random generator with 816 * next_rand = (16807*seed) mod (2**31-1) 817 * see 818 * (1) "Random Number Generators: Good Ones Are Hard to Find", 819 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), 820 * (2) "Two Fast Implementations of the 'Minimal Standard' Random 821 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. 822 */ 823 const unsigned int a = 16807; 824 const unsigned int m = 2147483647; 825 const int q = m / a; assert(q == 127773, "weird math"); 826 const int r = m % a; assert(r == 2836, "weird math"); 827 828 // compute az=2^31p+q 829 unsigned int lo = a * (rand_seed & 0xFFFF); 830 unsigned int hi = a * (rand_seed >> 16); 831 lo += (hi & 0x7FFF) << 16; 832 833 // if q overflowed, ignore the overflow and increment q 834 if (lo > m) { 835 lo &= m; 836 ++lo; 837 } 838 lo += hi >> 15; 839 840 // if (p+q) overflowed, ignore the overflow and increment (p+q) 841 if (lo > m) { 842 lo &= m; 843 ++lo; 844 } 845 return lo; 846 } 847 848 int os::random() { 849 // Make updating the random seed thread safe. 850 while (true) { 851 unsigned int seed = _rand_seed; 852 unsigned int rand = random_helper(seed); 853 if (Atomic::cmpxchg(rand, &_rand_seed, seed) == seed) { 854 return static_cast<int>(rand); 855 } 856 } 857 } 858 859 // The INITIALIZED state is distinguished from the SUSPENDED state because the 860 // conditions in which a thread is first started are different from those in which 861 // a suspension is resumed. These differences make it hard for us to apply the 862 // tougher checks when starting threads that we want to do when resuming them. 863 // However, when start_thread is called as a result of Thread.start, on a Java 864 // thread, the operation is synchronized on the Java Thread object. So there 865 // cannot be a race to start the thread and hence for the thread to exit while 866 // we are working on it. Non-Java threads that start Java threads either have 867 // to do so in a context in which races are impossible, or should do appropriate 868 // locking. 869 870 void os::start_thread(Thread* thread) { 871 // guard suspend/resume 872 MutexLocker ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); 873 OSThread* osthread = thread->osthread(); 874 osthread->set_state(RUNNABLE); 875 pd_start_thread(thread); 876 } 877 878 void os::abort(bool dump_core) { 879 abort(dump_core && CreateCoredumpOnCrash, NULL, NULL); 880 } 881 882 //--------------------------------------------------------------------------- 883 // Helper functions for fatal error handler 884 885 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { 886 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); 887 888 start = align_down(start, unitsize); 889 890 int cols = 0; 891 int cols_per_line = 0; 892 switch (unitsize) { 893 case 1: cols_per_line = 16; break; 894 case 2: cols_per_line = 8; break; 895 case 4: cols_per_line = 4; break; 896 case 8: cols_per_line = 2; break; 897 default: return; 898 } 899 900 address p = start; 901 st->print(PTR_FORMAT ": ", p2i(start)); 902 while (p < end) { 903 if (is_readable_pointer(p)) { 904 switch (unitsize) { 905 case 1: st->print("%02x", *(u1*)p); break; 906 case 2: st->print("%04x", *(u2*)p); break; 907 case 4: st->print("%08x", *(u4*)p); break; 908 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; 909 } 910 } else { 911 st->print("%*.*s", 2*unitsize, 2*unitsize, "????????????????"); 912 } 913 p += unitsize; 914 cols++; 915 if (cols >= cols_per_line && p < end) { 916 cols = 0; 917 st->cr(); 918 st->print(PTR_FORMAT ": ", p2i(p)); 919 } else { 920 st->print(" "); 921 } 922 } 923 st->cr(); 924 } 925 926 void os::print_instructions(outputStream* st, address pc, int unitsize) { 927 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc)); 928 print_hex_dump(st, pc - 256, pc + 256, unitsize); 929 } 930 931 void os::print_environment_variables(outputStream* st, const char** env_list) { 932 if (env_list) { 933 st->print_cr("Environment Variables:"); 934 935 for (int i = 0; env_list[i] != NULL; i++) { 936 char *envvar = ::getenv(env_list[i]); 937 if (envvar != NULL) { 938 st->print("%s", env_list[i]); 939 st->print("="); 940 st->print_cr("%s", envvar); 941 } 942 } 943 } 944 } 945 946 void os::print_cpu_info(outputStream* st, char* buf, size_t buflen) { 947 // cpu 948 st->print("CPU:"); 949 st->print("total %d", os::processor_count()); 950 // It's not safe to query number of active processors after crash 951 // st->print("(active %d)", os::active_processor_count()); but we can 952 // print the initial number of active processors. 953 // We access the raw value here because the assert in the accessor will 954 // fail if the crash occurs before initialization of this value. 955 st->print(" (initial active %d)", _initial_active_processor_count); 956 st->print(" %s", VM_Version::features_string()); 957 st->cr(); 958 pd_print_cpu_info(st, buf, buflen); 959 } 960 961 // Print a one line string summarizing the cpu, number of cores, memory, and operating system version 962 void os::print_summary_info(outputStream* st, char* buf, size_t buflen) { 963 st->print("Host: "); 964 #ifndef PRODUCT 965 if (get_host_name(buf, buflen)) { 966 st->print("%s, ", buf); 967 } 968 #endif // PRODUCT 969 get_summary_cpu_info(buf, buflen); 970 st->print("%s, ", buf); 971 size_t mem = physical_memory()/G; 972 if (mem == 0) { // for low memory systems 973 mem = physical_memory()/M; 974 st->print("%d cores, " SIZE_FORMAT "M, ", processor_count(), mem); 975 } else { 976 st->print("%d cores, " SIZE_FORMAT "G, ", processor_count(), mem); 977 } 978 get_summary_os_info(buf, buflen); 979 st->print_raw(buf); 980 st->cr(); 981 } 982 983 void os::print_date_and_time(outputStream *st, char* buf, size_t buflen) { 984 const int secs_per_day = 86400; 985 const int secs_per_hour = 3600; 986 const int secs_per_min = 60; 987 988 time_t tloc; 989 (void)time(&tloc); 990 char* timestring = ctime(&tloc); // ctime adds newline. 991 // edit out the newline 992 char* nl = strchr(timestring, '\n'); 993 if (nl != NULL) { 994 *nl = '\0'; 995 } 996 997 struct tm tz; 998 if (localtime_pd(&tloc, &tz) != NULL) { 999 ::strftime(buf, buflen, "%Z", &tz); 1000 st->print("Time: %s %s", timestring, buf); 1001 } else { 1002 st->print("Time: %s", timestring); 1003 } 1004 1005 double t = os::elapsedTime(); 1006 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in 1007 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int 1008 // before printf. We lost some precision, but who cares? 1009 int eltime = (int)t; // elapsed time in seconds 1010 1011 // print elapsed time in a human-readable format: 1012 int eldays = eltime / secs_per_day; 1013 int day_secs = eldays * secs_per_day; 1014 int elhours = (eltime - day_secs) / secs_per_hour; 1015 int hour_secs = elhours * secs_per_hour; 1016 int elmins = (eltime - day_secs - hour_secs) / secs_per_min; 1017 int minute_secs = elmins * secs_per_min; 1018 int elsecs = (eltime - day_secs - hour_secs - minute_secs); 1019 st->print_cr(" elapsed time: %d seconds (%dd %dh %dm %ds)", eltime, eldays, elhours, elmins, elsecs); 1020 } 1021 1022 1023 // Check if pointer can be read from (4-byte read access). 1024 // Helps to prove validity of a not-NULL pointer. 1025 // Returns true in very early stages of VM life when stub is not yet generated. 1026 #define SAFEFETCH_DEFAULT true 1027 bool os::is_readable_pointer(const void* p) { 1028 if (!CanUseSafeFetch32()) { 1029 return SAFEFETCH_DEFAULT; 1030 } 1031 int* const aligned = (int*) align_down((intptr_t)p, 4); 1032 int cafebabe = 0xcafebabe; // tester value 1 1033 int deadbeef = 0xdeadbeef; // tester value 2 1034 return (SafeFetch32(aligned, cafebabe) != cafebabe) || (SafeFetch32(aligned, deadbeef) != deadbeef); 1035 } 1036 1037 bool os::is_readable_range(const void* from, const void* to) { 1038 if ((uintptr_t)from >= (uintptr_t)to) return false; 1039 for (uintptr_t p = align_down((uintptr_t)from, min_page_size()); p < (uintptr_t)to; p += min_page_size()) { 1040 if (!is_readable_pointer((const void*)p)) { 1041 return false; 1042 } 1043 } 1044 return true; 1045 } 1046 1047 1048 // moved from debug.cpp (used to be find()) but still called from there 1049 // The verbose parameter is only set by the debug code in one case 1050 void os::print_location(outputStream* st, intptr_t x, bool verbose) { 1051 address addr = (address)x; 1052 // Handle NULL first, so later checks don't need to protect against it. 1053 if (addr == NULL) { 1054 st->print_cr("0x0 is NULL"); 1055 return; 1056 } 1057 1058 // Check if addr points into a code blob. 1059 CodeBlob* b = CodeCache::find_blob_unsafe(addr); 1060 if (b != NULL) { 1061 b->dump_for_addr(addr, st, verbose); 1062 return; 1063 } 1064 1065 // Check if addr points into Java heap. 1066 if (Universe::heap()->is_in(addr)) { 1067 oop o = oopDesc::oop_or_null(addr); 1068 if (o != NULL) { 1069 if ((HeapWord*)o == (HeapWord*)addr) { 1070 st->print(INTPTR_FORMAT " is an oop: ", p2i(addr)); 1071 } else { 1072 st->print(INTPTR_FORMAT " is pointing into object: " , p2i(addr)); 1073 } 1074 o->print_on(st); 1075 return; 1076 } 1077 } else if (Universe::heap()->is_in_reserved(addr)) { 1078 st->print_cr(INTPTR_FORMAT " is an unallocated location in the heap", p2i(addr)); 1079 return; 1080 } 1081 1082 // Compressed oop needs to be decoded first. 1083 #ifdef _LP64 1084 if (UseCompressedOops && ((uintptr_t)addr &~ (uintptr_t)max_juint) == 0) { 1085 narrowOop narrow_oop = (narrowOop)(uintptr_t)addr; 1086 oop o = CompressedOops::decode_raw(narrow_oop); 1087 1088 if (oopDesc::is_valid(o)) { 1089 st->print(UINT32_FORMAT " is a compressed pointer to object: ", narrow_oop); 1090 o->print_on(st); 1091 return; 1092 } 1093 } 1094 #endif 1095 1096 bool accessible = is_readable_pointer(addr); 1097 1098 // Check if addr is a JNI handle. 1099 if (align_down((intptr_t)addr, sizeof(intptr_t)) != 0 && accessible) { 1100 if (JNIHandles::is_global_handle((jobject) addr)) { 1101 st->print_cr(INTPTR_FORMAT " is a global jni handle", p2i(addr)); 1102 return; 1103 } 1104 if (JNIHandles::is_weak_global_handle((jobject) addr)) { 1105 st->print_cr(INTPTR_FORMAT " is a weak global jni handle", p2i(addr)); 1106 return; 1107 } 1108 #ifndef PRODUCT 1109 // we don't keep the block list in product mode 1110 if (JNIHandles::is_local_handle((jobject) addr)) { 1111 st->print_cr(INTPTR_FORMAT " is a local jni handle", p2i(addr)); 1112 return; 1113 } 1114 #endif 1115 } 1116 1117 // Check if addr belongs to a Java thread. 1118 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thread = jtiwh.next(); ) { 1119 // If the addr is a java thread print information about that. 1120 if (addr == (address)thread) { 1121 if (verbose) { 1122 thread->print_on(st); 1123 } else { 1124 st->print_cr(INTPTR_FORMAT " is a thread", p2i(addr)); 1125 } 1126 return; 1127 } 1128 // If the addr is in the stack region for this thread then report that 1129 // and print thread info 1130 if (thread->on_local_stack(addr)) { 1131 st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " 1132 INTPTR_FORMAT, p2i(addr), p2i(thread)); 1133 if (verbose) thread->print_on(st); 1134 return; 1135 } 1136 } 1137 1138 // Check if in metaspace and print types that have vptrs 1139 if (Metaspace::contains(addr)) { 1140 if (Klass::is_valid((Klass*)addr)) { 1141 st->print_cr(INTPTR_FORMAT " is a pointer to class: ", p2i(addr)); 1142 ((Klass*)addr)->print_on(st); 1143 } else if (Method::is_valid_method((const Method*)addr)) { 1144 ((Method*)addr)->print_value_on(st); 1145 st->cr(); 1146 } else { 1147 // Use addr->print() from the debugger instead (not here) 1148 st->print_cr(INTPTR_FORMAT " is pointing into metadata", p2i(addr)); 1149 } 1150 return; 1151 } 1152 1153 // Compressed klass needs to be decoded first. 1154 #ifdef _LP64 1155 if (UseCompressedClassPointers && ((uintptr_t)addr &~ (uintptr_t)max_juint) == 0) { 1156 narrowKlass narrow_klass = (narrowKlass)(uintptr_t)addr; 1157 Klass* k = CompressedKlassPointers::decode_raw(narrow_klass); 1158 1159 if (Klass::is_valid(k)) { 1160 st->print_cr(UINT32_FORMAT " is a compressed pointer to class: " INTPTR_FORMAT, narrow_klass, p2i((HeapWord*)k)); 1161 k->print_on(st); 1162 return; 1163 } 1164 } 1165 #endif 1166 1167 // Try an OS specific find 1168 if (os::find(addr, st)) { 1169 return; 1170 } 1171 1172 if (accessible) { 1173 st->print(INTPTR_FORMAT " points into unknown readable memory:", p2i(addr)); 1174 for (address p = addr; p < align_up(addr + 1, sizeof(intptr_t)); ++p) { 1175 st->print(" %02x", *(u1*)p); 1176 } 1177 st->cr(); 1178 return; 1179 } 1180 1181 st->print_cr(INTPTR_FORMAT " is an unknown value", p2i(addr)); 1182 } 1183 1184 // Looks like all platforms can use the same function to check if C 1185 // stack is walkable beyond current frame. The check for fp() is not 1186 // necessary on Sparc, but it's harmless. 1187 bool os::is_first_C_frame(frame* fr) { 1188 // Load up sp, fp, sender sp and sender fp, check for reasonable values. 1189 // Check usp first, because if that's bad the other accessors may fault 1190 // on some architectures. Ditto ufp second, etc. 1191 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); 1192 // sp on amd can be 32 bit aligned. 1193 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); 1194 1195 uintptr_t usp = (uintptr_t)fr->sp(); 1196 if ((usp & sp_align_mask) != 0) return true; 1197 1198 uintptr_t ufp = (uintptr_t)fr->fp(); 1199 if ((ufp & fp_align_mask) != 0) return true; 1200 1201 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); 1202 if ((old_sp & sp_align_mask) != 0) return true; 1203 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; 1204 1205 uintptr_t old_fp = (uintptr_t)fr->link(); 1206 if ((old_fp & fp_align_mask) != 0) return true; 1207 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; 1208 1209 // stack grows downwards; if old_fp is below current fp or if the stack 1210 // frame is too large, either the stack is corrupted or fp is not saved 1211 // on stack (i.e. on x86, ebp may be used as general register). The stack 1212 // is not walkable beyond current frame. 1213 if (old_fp < ufp) return true; 1214 if (old_fp - ufp > 64 * K) return true; 1215 1216 return false; 1217 } 1218 1219 1220 // Set up the boot classpath. 1221 1222 char* os::format_boot_path(const char* format_string, 1223 const char* home, 1224 int home_len, 1225 char fileSep, 1226 char pathSep) { 1227 assert((fileSep == '/' && pathSep == ':') || 1228 (fileSep == '\\' && pathSep == ';'), "unexpected separator chars"); 1229 1230 // Scan the format string to determine the length of the actual 1231 // boot classpath, and handle platform dependencies as well. 1232 int formatted_path_len = 0; 1233 const char* p; 1234 for (p = format_string; *p != 0; ++p) { 1235 if (*p == '%') formatted_path_len += home_len - 1; 1236 ++formatted_path_len; 1237 } 1238 1239 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1, mtInternal); 1240 if (formatted_path == NULL) { 1241 return NULL; 1242 } 1243 1244 // Create boot classpath from format, substituting separator chars and 1245 // java home directory. 1246 char* q = formatted_path; 1247 for (p = format_string; *p != 0; ++p) { 1248 switch (*p) { 1249 case '%': 1250 strcpy(q, home); 1251 q += home_len; 1252 break; 1253 case '/': 1254 *q++ = fileSep; 1255 break; 1256 case ':': 1257 *q++ = pathSep; 1258 break; 1259 default: 1260 *q++ = *p; 1261 } 1262 } 1263 *q = '\0'; 1264 1265 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); 1266 return formatted_path; 1267 } 1268 1269 // This function is a proxy to fopen, it tries to add a non standard flag ('e' or 'N') 1270 // that ensures automatic closing of the file on exec. If it can not find support in 1271 // the underlying c library, it will make an extra system call (fcntl) to ensure automatic 1272 // closing of the file on exec. 1273 FILE* os::fopen(const char* path, const char* mode) { 1274 char modified_mode[20]; 1275 assert(strlen(mode) + 1 < sizeof(modified_mode), "mode chars plus one extra must fit in buffer"); 1276 sprintf(modified_mode, "%s" LINUX_ONLY("e") BSD_ONLY("e") WINDOWS_ONLY("N"), mode); 1277 FILE* file = ::fopen(path, modified_mode); 1278 1279 #if !(defined LINUX || defined BSD || defined _WINDOWS) 1280 // assume fcntl FD_CLOEXEC support as a backup solution when 'e' or 'N' 1281 // is not supported as mode in fopen 1282 if (file != NULL) { 1283 int fd = fileno(file); 1284 if (fd != -1) { 1285 int fd_flags = fcntl(fd, F_GETFD); 1286 if (fd_flags != -1) { 1287 fcntl(fd, F_SETFD, fd_flags | FD_CLOEXEC); 1288 } 1289 } 1290 } 1291 #endif 1292 1293 return file; 1294 } 1295 1296 bool os::set_boot_path(char fileSep, char pathSep) { 1297 const char* home = Arguments::get_java_home(); 1298 int home_len = (int)strlen(home); 1299 1300 struct stat st; 1301 1302 // modular image if "modules" jimage exists 1303 char* jimage = format_boot_path("%/lib/" MODULES_IMAGE_NAME, home, home_len, fileSep, pathSep); 1304 if (jimage == NULL) return false; 1305 bool has_jimage = (os::stat(jimage, &st) == 0); 1306 if (has_jimage) { 1307 Arguments::set_sysclasspath(jimage, true); 1308 FREE_C_HEAP_ARRAY(char, jimage); 1309 return true; 1310 } 1311 FREE_C_HEAP_ARRAY(char, jimage); 1312 1313 // check if developer build with exploded modules 1314 char* base_classes = format_boot_path("%/modules/" JAVA_BASE_NAME, home, home_len, fileSep, pathSep); 1315 if (base_classes == NULL) return false; 1316 if (os::stat(base_classes, &st) == 0) { 1317 Arguments::set_sysclasspath(base_classes, false); 1318 FREE_C_HEAP_ARRAY(char, base_classes); 1319 return true; 1320 } 1321 FREE_C_HEAP_ARRAY(char, base_classes); 1322 1323 return false; 1324 } 1325 1326 /* 1327 * Splits a path, based on its separator, the number of 1328 * elements is returned back in n. 1329 * It is the callers responsibility to: 1330 * a> check the value of n, and n may be 0. 1331 * b> ignore any empty path elements 1332 * c> free up the data. 1333 */ 1334 char** os::split_path(const char* path, int* n) { 1335 *n = 0; 1336 if (path == NULL || strlen(path) == 0) { 1337 return NULL; 1338 } 1339 const char psepchar = *os::path_separator(); 1340 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1, mtInternal); 1341 if (inpath == NULL) { 1342 return NULL; 1343 } 1344 strcpy(inpath, path); 1345 int count = 1; 1346 char* p = strchr(inpath, psepchar); 1347 // Get a count of elements to allocate memory 1348 while (p != NULL) { 1349 count++; 1350 p++; 1351 p = strchr(p, psepchar); 1352 } 1353 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count, mtInternal); 1354 if (opath == NULL) { 1355 return NULL; 1356 } 1357 1358 // do the actual splitting 1359 p = inpath; 1360 for (int i = 0 ; i < count ; i++) { 1361 size_t len = strcspn(p, os::path_separator()); 1362 if (len > JVM_MAXPATHLEN) { 1363 return NULL; 1364 } 1365 // allocate the string and add terminator storage 1366 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 1367 if (s == NULL) { 1368 return NULL; 1369 } 1370 strncpy(s, p, len); 1371 s[len] = '\0'; 1372 opath[i] = s; 1373 p += len + 1; 1374 } 1375 FREE_C_HEAP_ARRAY(char, inpath); 1376 *n = count; 1377 return opath; 1378 } 1379 1380 // Returns true if the current stack pointer is above the stack shadow 1381 // pages, false otherwise. 1382 bool os::stack_shadow_pages_available(Thread *thread, const methodHandle& method, address sp) { 1383 if (!thread->is_Java_thread()) return false; 1384 // Check if we have StackShadowPages above the yellow zone. This parameter 1385 // is dependent on the depth of the maximum VM call stack possible from 1386 // the handler for stack overflow. 'instanceof' in the stack overflow 1387 // handler or a println uses at least 8k stack of VM and native code 1388 // respectively. 1389 const int framesize_in_bytes = 1390 Interpreter::size_top_interpreter_activation(method()) * wordSize; 1391 1392 address limit = ((JavaThread*)thread)->stack_end() + 1393 (JavaThread::stack_guard_zone_size() + JavaThread::stack_shadow_zone_size()); 1394 1395 return sp > (limit + framesize_in_bytes); 1396 } 1397 1398 size_t os::page_size_for_region(size_t region_size, size_t min_pages, bool must_be_aligned) { 1399 assert(min_pages > 0, "sanity"); 1400 if (UseLargePages) { 1401 const size_t max_page_size = region_size / min_pages; 1402 1403 for (size_t i = 0; _page_sizes[i] != 0; ++i) { 1404 const size_t page_size = _page_sizes[i]; 1405 if (page_size <= max_page_size) { 1406 if (!must_be_aligned || is_aligned(region_size, page_size)) { 1407 return page_size; 1408 } 1409 } 1410 } 1411 } 1412 1413 return vm_page_size(); 1414 } 1415 1416 size_t os::page_size_for_region_aligned(size_t region_size, size_t min_pages) { 1417 return page_size_for_region(region_size, min_pages, true); 1418 } 1419 1420 size_t os::page_size_for_region_unaligned(size_t region_size, size_t min_pages) { 1421 return page_size_for_region(region_size, min_pages, false); 1422 } 1423 1424 static const char* errno_to_string (int e, bool short_text) { 1425 #define ALL_SHARED_ENUMS(X) \ 1426 X(E2BIG, "Argument list too long") \ 1427 X(EACCES, "Permission denied") \ 1428 X(EADDRINUSE, "Address in use") \ 1429 X(EADDRNOTAVAIL, "Address not available") \ 1430 X(EAFNOSUPPORT, "Address family not supported") \ 1431 X(EAGAIN, "Resource unavailable, try again") \ 1432 X(EALREADY, "Connection already in progress") \ 1433 X(EBADF, "Bad file descriptor") \ 1434 X(EBADMSG, "Bad message") \ 1435 X(EBUSY, "Device or resource busy") \ 1436 X(ECANCELED, "Operation canceled") \ 1437 X(ECHILD, "No child processes") \ 1438 X(ECONNABORTED, "Connection aborted") \ 1439 X(ECONNREFUSED, "Connection refused") \ 1440 X(ECONNRESET, "Connection reset") \ 1441 X(EDEADLK, "Resource deadlock would occur") \ 1442 X(EDESTADDRREQ, "Destination address required") \ 1443 X(EDOM, "Mathematics argument out of domain of function") \ 1444 X(EEXIST, "File exists") \ 1445 X(EFAULT, "Bad address") \ 1446 X(EFBIG, "File too large") \ 1447 X(EHOSTUNREACH, "Host is unreachable") \ 1448 X(EIDRM, "Identifier removed") \ 1449 X(EILSEQ, "Illegal byte sequence") \ 1450 X(EINPROGRESS, "Operation in progress") \ 1451 X(EINTR, "Interrupted function") \ 1452 X(EINVAL, "Invalid argument") \ 1453 X(EIO, "I/O error") \ 1454 X(EISCONN, "Socket is connected") \ 1455 X(EISDIR, "Is a directory") \ 1456 X(ELOOP, "Too many levels of symbolic links") \ 1457 X(EMFILE, "Too many open files") \ 1458 X(EMLINK, "Too many links") \ 1459 X(EMSGSIZE, "Message too large") \ 1460 X(ENAMETOOLONG, "Filename too long") \ 1461 X(ENETDOWN, "Network is down") \ 1462 X(ENETRESET, "Connection aborted by network") \ 1463 X(ENETUNREACH, "Network unreachable") \ 1464 X(ENFILE, "Too many files open in system") \ 1465 X(ENOBUFS, "No buffer space available") \ 1466 X(ENODATA, "No message is available on the STREAM head read queue") \ 1467 X(ENODEV, "No such device") \ 1468 X(ENOENT, "No such file or directory") \ 1469 X(ENOEXEC, "Executable file format error") \ 1470 X(ENOLCK, "No locks available") \ 1471 X(ENOLINK, "Reserved") \ 1472 X(ENOMEM, "Not enough space") \ 1473 X(ENOMSG, "No message of the desired type") \ 1474 X(ENOPROTOOPT, "Protocol not available") \ 1475 X(ENOSPC, "No space left on device") \ 1476 X(ENOSR, "No STREAM resources") \ 1477 X(ENOSTR, "Not a STREAM") \ 1478 X(ENOSYS, "Function not supported") \ 1479 X(ENOTCONN, "The socket is not connected") \ 1480 X(ENOTDIR, "Not a directory") \ 1481 X(ENOTEMPTY, "Directory not empty") \ 1482 X(ENOTSOCK, "Not a socket") \ 1483 X(ENOTSUP, "Not supported") \ 1484 X(ENOTTY, "Inappropriate I/O control operation") \ 1485 X(ENXIO, "No such device or address") \ 1486 X(EOPNOTSUPP, "Operation not supported on socket") \ 1487 X(EOVERFLOW, "Value too large to be stored in data type") \ 1488 X(EPERM, "Operation not permitted") \ 1489 X(EPIPE, "Broken pipe") \ 1490 X(EPROTO, "Protocol error") \ 1491 X(EPROTONOSUPPORT, "Protocol not supported") \ 1492 X(EPROTOTYPE, "Protocol wrong type for socket") \ 1493 X(ERANGE, "Result too large") \ 1494 X(EROFS, "Read-only file system") \ 1495 X(ESPIPE, "Invalid seek") \ 1496 X(ESRCH, "No such process") \ 1497 X(ETIME, "Stream ioctl() timeout") \ 1498 X(ETIMEDOUT, "Connection timed out") \ 1499 X(ETXTBSY, "Text file busy") \ 1500 X(EWOULDBLOCK, "Operation would block") \ 1501 X(EXDEV, "Cross-device link") 1502 1503 #define DEFINE_ENTRY(e, text) { e, #e, text }, 1504 1505 static const struct { 1506 int v; 1507 const char* short_text; 1508 const char* long_text; 1509 } table [] = { 1510 1511 ALL_SHARED_ENUMS(DEFINE_ENTRY) 1512 1513 // The following enums are not defined on all platforms. 1514 #ifdef ESTALE 1515 DEFINE_ENTRY(ESTALE, "Reserved") 1516 #endif 1517 #ifdef EDQUOT 1518 DEFINE_ENTRY(EDQUOT, "Reserved") 1519 #endif 1520 #ifdef EMULTIHOP 1521 DEFINE_ENTRY(EMULTIHOP, "Reserved") 1522 #endif 1523 1524 // End marker. 1525 { -1, "Unknown errno", "Unknown error" } 1526 1527 }; 1528 1529 #undef DEFINE_ENTRY 1530 #undef ALL_FLAGS 1531 1532 int i = 0; 1533 while (table[i].v != -1 && table[i].v != e) { 1534 i ++; 1535 } 1536 1537 return short_text ? table[i].short_text : table[i].long_text; 1538 1539 } 1540 1541 const char* os::strerror(int e) { 1542 return errno_to_string(e, false); 1543 } 1544 1545 const char* os::errno_name(int e) { 1546 return errno_to_string(e, true); 1547 } 1548 1549 void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count) { 1550 LogTarget(Info, pagesize) log; 1551 if (log.is_enabled()) { 1552 LogStream out(log); 1553 1554 out.print("%s: ", str); 1555 for (int i = 0; i < count; ++i) { 1556 out.print(" " SIZE_FORMAT, page_sizes[i]); 1557 } 1558 out.cr(); 1559 } 1560 } 1561 1562 #define trace_page_size_params(size) byte_size_in_exact_unit(size), exact_unit_for_byte_size(size) 1563 1564 void os::trace_page_sizes(const char* str, 1565 const size_t region_min_size, 1566 const size_t region_max_size, 1567 const size_t page_size, 1568 const char* base, 1569 const size_t size) { 1570 1571 log_info(pagesize)("%s: " 1572 " min=" SIZE_FORMAT "%s" 1573 " max=" SIZE_FORMAT "%s" 1574 " base=" PTR_FORMAT 1575 " page_size=" SIZE_FORMAT "%s" 1576 " size=" SIZE_FORMAT "%s", 1577 str, 1578 trace_page_size_params(region_min_size), 1579 trace_page_size_params(region_max_size), 1580 p2i(base), 1581 trace_page_size_params(page_size), 1582 trace_page_size_params(size)); 1583 } 1584 1585 void os::trace_page_sizes_for_requested_size(const char* str, 1586 const size_t requested_size, 1587 const size_t page_size, 1588 const size_t alignment, 1589 const char* base, 1590 const size_t size) { 1591 1592 log_info(pagesize)("%s:" 1593 " req_size=" SIZE_FORMAT "%s" 1594 " base=" PTR_FORMAT 1595 " page_size=" SIZE_FORMAT "%s" 1596 " alignment=" SIZE_FORMAT "%s" 1597 " size=" SIZE_FORMAT "%s", 1598 str, 1599 trace_page_size_params(requested_size), 1600 p2i(base), 1601 trace_page_size_params(page_size), 1602 trace_page_size_params(alignment), 1603 trace_page_size_params(size)); 1604 } 1605 1606 1607 // This is the working definition of a server class machine: 1608 // >= 2 physical CPU's and >=2GB of memory, with some fuzz 1609 // because the graphics memory (?) sometimes masks physical memory. 1610 // If you want to change the definition of a server class machine 1611 // on some OS or platform, e.g., >=4GB on Windows platforms, 1612 // then you'll have to parameterize this method based on that state, 1613 // as was done for logical processors here, or replicate and 1614 // specialize this method for each platform. (Or fix os to have 1615 // some inheritance structure and use subclassing. Sigh.) 1616 // If you want some platform to always or never behave as a server 1617 // class machine, change the setting of AlwaysActAsServerClassMachine 1618 // and NeverActAsServerClassMachine in globals*.hpp. 1619 bool os::is_server_class_machine() { 1620 // First check for the early returns 1621 if (NeverActAsServerClassMachine) { 1622 return false; 1623 } 1624 if (AlwaysActAsServerClassMachine) { 1625 return true; 1626 } 1627 // Then actually look at the machine 1628 bool result = false; 1629 const unsigned int server_processors = 2; 1630 const julong server_memory = 2UL * G; 1631 // We seem not to get our full complement of memory. 1632 // We allow some part (1/8?) of the memory to be "missing", 1633 // based on the sizes of DIMMs, and maybe graphics cards. 1634 const julong missing_memory = 256UL * M; 1635 1636 /* Is this a server class machine? */ 1637 if ((os::active_processor_count() >= (int)server_processors) && 1638 (os::physical_memory() >= (server_memory - missing_memory))) { 1639 const unsigned int logical_processors = 1640 VM_Version::logical_processors_per_package(); 1641 if (logical_processors > 1) { 1642 const unsigned int physical_packages = 1643 os::active_processor_count() / logical_processors; 1644 if (physical_packages >= server_processors) { 1645 result = true; 1646 } 1647 } else { 1648 result = true; 1649 } 1650 } 1651 return result; 1652 } 1653 1654 void os::initialize_initial_active_processor_count() { 1655 assert(_initial_active_processor_count == 0, "Initial active processor count already set."); 1656 _initial_active_processor_count = active_processor_count(); 1657 log_debug(os)("Initial active processor count set to %d" , _initial_active_processor_count); 1658 } 1659 1660 void os::SuspendedThreadTask::run() { 1661 internal_do_task(); 1662 _done = true; 1663 } 1664 1665 bool os::create_stack_guard_pages(char* addr, size_t bytes) { 1666 return os::pd_create_stack_guard_pages(addr, bytes); 1667 } 1668 1669 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint, int file_desc) { 1670 char* result = NULL; 1671 1672 if (file_desc != -1) { 1673 // Could have called pd_reserve_memory() followed by replace_existing_mapping_with_file_mapping(), 1674 // but AIX may use SHM in which case its more trouble to detach the segment and remap memory to the file. 1675 result = os::map_memory_to_file(addr, bytes, file_desc); 1676 if (result != NULL) { 1677 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, CALLER_PC); 1678 } 1679 } else { 1680 result = pd_reserve_memory(bytes, addr, alignment_hint); 1681 if (result != NULL) { 1682 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1683 } 1684 } 1685 1686 return result; 1687 } 1688 1689 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint, 1690 MEMFLAGS flags) { 1691 char* result = pd_reserve_memory(bytes, addr, alignment_hint); 1692 if (result != NULL) { 1693 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1694 MemTracker::record_virtual_memory_type((address)result, flags); 1695 } 1696 1697 return result; 1698 } 1699 1700 char* os::attempt_reserve_memory_at(size_t bytes, char* addr, int file_desc) { 1701 char* result = NULL; 1702 if (file_desc != -1) { 1703 result = pd_attempt_reserve_memory_at(bytes, addr, file_desc); 1704 if (result != NULL) { 1705 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, CALLER_PC); 1706 } 1707 } else { 1708 result = pd_attempt_reserve_memory_at(bytes, addr); 1709 if (result != NULL) { 1710 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1711 } 1712 } 1713 return result; 1714 } 1715 1716 void os::split_reserved_memory(char *base, size_t size, 1717 size_t split, bool realloc) { 1718 pd_split_reserved_memory(base, size, split, realloc); 1719 } 1720 1721 bool os::commit_memory(char* addr, size_t bytes, bool executable) { 1722 bool res = pd_commit_memory(addr, bytes, executable); 1723 if (res) { 1724 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); 1725 } 1726 return res; 1727 } 1728 1729 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, 1730 bool executable) { 1731 bool res = os::pd_commit_memory(addr, size, alignment_hint, executable); 1732 if (res) { 1733 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); 1734 } 1735 return res; 1736 } 1737 1738 void os::commit_memory_or_exit(char* addr, size_t bytes, bool executable, 1739 const char* mesg) { 1740 pd_commit_memory_or_exit(addr, bytes, executable, mesg); 1741 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); 1742 } 1743 1744 void os::commit_memory_or_exit(char* addr, size_t size, size_t alignment_hint, 1745 bool executable, const char* mesg) { 1746 os::pd_commit_memory_or_exit(addr, size, alignment_hint, executable, mesg); 1747 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); 1748 } 1749 1750 bool os::uncommit_memory(char* addr, size_t bytes) { 1751 bool res; 1752 if (MemTracker::tracking_level() > NMT_minimal) { 1753 Tracker tkr(Tracker::uncommit); 1754 res = pd_uncommit_memory(addr, bytes); 1755 if (res) { 1756 tkr.record((address)addr, bytes); 1757 } 1758 } else { 1759 res = pd_uncommit_memory(addr, bytes); 1760 } 1761 return res; 1762 } 1763 1764 bool os::release_memory(char* addr, size_t bytes) { 1765 bool res; 1766 if (MemTracker::tracking_level() > NMT_minimal) { 1767 Tracker tkr(Tracker::release); 1768 res = pd_release_memory(addr, bytes); 1769 if (res) { 1770 tkr.record((address)addr, bytes); 1771 } 1772 } else { 1773 res = pd_release_memory(addr, bytes); 1774 } 1775 return res; 1776 } 1777 1778 void os::pretouch_memory(void* start, void* end, size_t page_size) { 1779 for (volatile char *p = (char*)start; p < (char*)end; p += page_size) { 1780 *p = 0; 1781 } 1782 } 1783 1784 char* os::map_memory(int fd, const char* file_name, size_t file_offset, 1785 char *addr, size_t bytes, bool read_only, 1786 bool allow_exec) { 1787 char* result = pd_map_memory(fd, file_name, file_offset, addr, bytes, read_only, allow_exec); 1788 if (result != NULL) { 1789 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, CALLER_PC); 1790 } 1791 return result; 1792 } 1793 1794 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 1795 char *addr, size_t bytes, bool read_only, 1796 bool allow_exec) { 1797 return pd_remap_memory(fd, file_name, file_offset, addr, bytes, 1798 read_only, allow_exec); 1799 } 1800 1801 bool os::unmap_memory(char *addr, size_t bytes) { 1802 bool result; 1803 if (MemTracker::tracking_level() > NMT_minimal) { 1804 Tracker tkr(Tracker::release); 1805 result = pd_unmap_memory(addr, bytes); 1806 if (result) { 1807 tkr.record((address)addr, bytes); 1808 } 1809 } else { 1810 result = pd_unmap_memory(addr, bytes); 1811 } 1812 return result; 1813 } 1814 1815 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { 1816 pd_free_memory(addr, bytes, alignment_hint); 1817 } 1818 1819 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 1820 pd_realign_memory(addr, bytes, alignment_hint); 1821 } 1822 1823 #ifndef _WINDOWS 1824 /* try to switch state from state "from" to state "to" 1825 * returns the state set after the method is complete 1826 */ 1827 os::SuspendResume::State os::SuspendResume::switch_state(os::SuspendResume::State from, 1828 os::SuspendResume::State to) 1829 { 1830 os::SuspendResume::State result = Atomic::cmpxchg(to, &_state, from); 1831 if (result == from) { 1832 // success 1833 return to; 1834 } 1835 return result; 1836 } 1837 #endif