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) { 366 // Attempt to transit state to AL_INITIALIZING. 367 AttachListenerState cur_state = AttachListener::transit_state(AL_INITIALIZING, AL_NOT_INITIALIZED); 368 if (cur_state == AL_INITIALIZING) { 369 // Attach Listener has been started to initialize. Ignore this signal. 370 continue; 371 } else if (cur_state == AL_NOT_INITIALIZED) { 372 // Start to initialize. 373 if (!AttachListener::is_init_trigger()) { 374 // Attach Listener could not be started. 375 // So we need to transit the state to AL_NOT_INITIALIZED. 376 AttachListener::set_state(AL_NOT_INITIALIZED); 377 } 378 continue; 379 } else if (AttachListener::check_socket_file()) { 380 // Attach Listener has been started, but unix domain socket file 381 // does not exist. So restart Attach Listener. 382 continue; 383 } 384 } 385 // Print stack traces 386 // Any SIGBREAK operations added here should make sure to flush 387 // the output stream (e.g. tty->flush()) after output. See 4803766. 388 // Each module also prints an extra carriage return after its output. 389 VM_PrintThreads op; 390 VMThread::execute(&op); 391 VM_PrintJNI jni_op; 392 VMThread::execute(&jni_op); 393 VM_FindDeadlocks op1(tty); 394 VMThread::execute(&op1); 395 Universe::print_heap_at_SIGBREAK(); 396 if (PrintClassHistogram) { 397 VM_GC_HeapInspection op1(tty, true /* force full GC before heap inspection */); 398 VMThread::execute(&op1); 399 } 400 if (JvmtiExport::should_post_data_dump()) { 401 JvmtiExport::post_data_dump(); 402 } 403 break; 404 } 405 default: { 406 // Dispatch the signal to java 407 HandleMark hm(THREAD); 408 Klass* klass = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_misc_Signal(), THREAD); 409 if (klass != NULL) { 410 JavaValue result(T_VOID); 411 JavaCallArguments args; 412 args.push_int(sig); 413 JavaCalls::call_static( 414 &result, 415 klass, 416 vmSymbols::dispatch_name(), 417 vmSymbols::int_void_signature(), 418 &args, 419 THREAD 420 ); 421 } 422 if (HAS_PENDING_EXCEPTION) { 423 // tty is initialized early so we don't expect it to be null, but 424 // if it is we can't risk doing an initialization that might 425 // trigger additional out-of-memory conditions 426 if (tty != NULL) { 427 char klass_name[256]; 428 char tmp_sig_name[16]; 429 const char* sig_name = "UNKNOWN"; 430 InstanceKlass::cast(PENDING_EXCEPTION->klass())-> 431 name()->as_klass_external_name(klass_name, 256); 432 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) 433 sig_name = tmp_sig_name; 434 warning("Exception %s occurred dispatching signal %s to handler" 435 "- the VM may need to be forcibly terminated", 436 klass_name, sig_name ); 437 } 438 CLEAR_PENDING_EXCEPTION; 439 } 440 } 441 } 442 } 443 } 444 445 void os::init_before_ergo() { 446 initialize_initial_active_processor_count(); 447 // We need to initialize large page support here because ergonomics takes some 448 // decisions depending on large page support and the calculated large page size. 449 large_page_init(); 450 451 // We need to adapt the configured number of stack protection pages given 452 // in 4K pages to the actual os page size. We must do this before setting 453 // up minimal stack sizes etc. in os::init_2(). 454 JavaThread::set_stack_red_zone_size (align_up(StackRedPages * 4 * K, vm_page_size())); 455 JavaThread::set_stack_yellow_zone_size (align_up(StackYellowPages * 4 * K, vm_page_size())); 456 JavaThread::set_stack_reserved_zone_size(align_up(StackReservedPages * 4 * K, vm_page_size())); 457 JavaThread::set_stack_shadow_zone_size (align_up(StackShadowPages * 4 * K, vm_page_size())); 458 459 // VM version initialization identifies some characteristics of the 460 // platform that are used during ergonomic decisions. 461 VM_Version::init_before_ergo(); 462 } 463 464 void os::initialize_jdk_signal_support(TRAPS) { 465 if (!ReduceSignalUsage) { 466 // Setup JavaThread for processing signals 467 const char thread_name[] = "Signal Dispatcher"; 468 Handle string = java_lang_String::create_from_str(thread_name, CHECK); 469 470 // Initialize thread_oop to put it into the system threadGroup 471 Handle thread_group (THREAD, Universe::system_thread_group()); 472 Handle thread_oop = JavaCalls::construct_new_instance(SystemDictionary::Thread_klass(), 473 vmSymbols::threadgroup_string_void_signature(), 474 thread_group, 475 string, 476 CHECK); 477 478 Klass* group = SystemDictionary::ThreadGroup_klass(); 479 JavaValue result(T_VOID); 480 JavaCalls::call_special(&result, 481 thread_group, 482 group, 483 vmSymbols::add_method_name(), 484 vmSymbols::thread_void_signature(), 485 thread_oop, 486 CHECK); 487 488 { MutexLocker mu(Threads_lock); 489 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); 490 491 // At this point it may be possible that no osthread was created for the 492 // JavaThread due to lack of memory. We would have to throw an exception 493 // in that case. However, since this must work and we do not allow 494 // exceptions anyway, check and abort if this fails. 495 if (signal_thread == NULL || signal_thread->osthread() == NULL) { 496 vm_exit_during_initialization("java.lang.OutOfMemoryError", 497 os::native_thread_creation_failed_msg()); 498 } 499 500 java_lang_Thread::set_thread(thread_oop(), signal_thread); 501 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 502 java_lang_Thread::set_daemon(thread_oop()); 503 504 signal_thread->set_threadObj(thread_oop()); 505 Threads::add(signal_thread); 506 Thread::start(signal_thread); 507 } 508 // Handle ^BREAK 509 os::signal(SIGBREAK, os::user_handler()); 510 } 511 } 512 513 514 void os::terminate_signal_thread() { 515 if (!ReduceSignalUsage) 516 signal_notify(sigexitnum_pd()); 517 } 518 519 520 // --------------------- loading libraries --------------------- 521 522 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); 523 extern struct JavaVM_ main_vm; 524 525 static void* _native_java_library = NULL; 526 527 void* os::native_java_library() { 528 if (_native_java_library == NULL) { 529 char buffer[JVM_MAXPATHLEN]; 530 char ebuf[1024]; 531 532 // Try to load verify dll first. In 1.3 java dll depends on it and is not 533 // always able to find it when the loading executable is outside the JDK. 534 // In order to keep working with 1.2 we ignore any loading errors. 535 if (dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), 536 "verify")) { 537 dll_load(buffer, ebuf, sizeof(ebuf)); 538 } 539 540 // Load java dll 541 if (dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), 542 "java")) { 543 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); 544 } 545 if (_native_java_library == NULL) { 546 vm_exit_during_initialization("Unable to load native library", ebuf); 547 } 548 549 #if defined(__OpenBSD__) 550 // Work-around OpenBSD's lack of $ORIGIN support by pre-loading libnet.so 551 // ignore errors 552 if (dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), 553 "net")) { 554 dll_load(buffer, ebuf, sizeof(ebuf)); 555 } 556 #endif 557 } 558 return _native_java_library; 559 } 560 561 /* 562 * Support for finding Agent_On(Un)Load/Attach<_lib_name> if it exists. 563 * If check_lib == true then we are looking for an 564 * Agent_OnLoad_lib_name or Agent_OnAttach_lib_name function to determine if 565 * this library is statically linked into the image. 566 * If check_lib == false then we will look for the appropriate symbol in the 567 * executable if agent_lib->is_static_lib() == true or in the shared library 568 * referenced by 'handle'. 569 */ 570 void* os::find_agent_function(AgentLibrary *agent_lib, bool check_lib, 571 const char *syms[], size_t syms_len) { 572 assert(agent_lib != NULL, "sanity check"); 573 const char *lib_name; 574 void *handle = agent_lib->os_lib(); 575 void *entryName = NULL; 576 char *agent_function_name; 577 size_t i; 578 579 // If checking then use the agent name otherwise test is_static_lib() to 580 // see how to process this lookup 581 lib_name = ((check_lib || agent_lib->is_static_lib()) ? agent_lib->name() : NULL); 582 for (i = 0; i < syms_len; i++) { 583 agent_function_name = build_agent_function_name(syms[i], lib_name, agent_lib->is_absolute_path()); 584 if (agent_function_name == NULL) { 585 break; 586 } 587 entryName = dll_lookup(handle, agent_function_name); 588 FREE_C_HEAP_ARRAY(char, agent_function_name); 589 if (entryName != NULL) { 590 break; 591 } 592 } 593 return entryName; 594 } 595 596 // See if the passed in agent is statically linked into the VM image. 597 bool os::find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], 598 size_t syms_len) { 599 void *ret; 600 void *proc_handle; 601 void *save_handle; 602 603 assert(agent_lib != NULL, "sanity check"); 604 if (agent_lib->name() == NULL) { 605 return false; 606 } 607 proc_handle = get_default_process_handle(); 608 // Check for Agent_OnLoad/Attach_lib_name function 609 save_handle = agent_lib->os_lib(); 610 // We want to look in this process' symbol table. 611 agent_lib->set_os_lib(proc_handle); 612 ret = find_agent_function(agent_lib, true, syms, syms_len); 613 if (ret != NULL) { 614 // Found an entry point like Agent_OnLoad_lib_name so we have a static agent 615 agent_lib->set_valid(); 616 agent_lib->set_static_lib(true); 617 return true; 618 } 619 agent_lib->set_os_lib(save_handle); 620 return false; 621 } 622 623 // --------------------- heap allocation utilities --------------------- 624 625 char *os::strdup(const char *str, MEMFLAGS flags) { 626 size_t size = strlen(str); 627 char *dup_str = (char *)malloc(size + 1, flags); 628 if (dup_str == NULL) return NULL; 629 strcpy(dup_str, str); 630 return dup_str; 631 } 632 633 char* os::strdup_check_oom(const char* str, MEMFLAGS flags) { 634 char* p = os::strdup(str, flags); 635 if (p == NULL) { 636 vm_exit_out_of_memory(strlen(str) + 1, OOM_MALLOC_ERROR, "os::strdup_check_oom"); 637 } 638 return p; 639 } 640 641 642 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ 643 644 #ifdef ASSERT 645 646 static void verify_memory(void* ptr) { 647 GuardedMemory guarded(ptr); 648 if (!guarded.verify_guards()) { 649 LogTarget(Warning, malloc, free) lt; 650 ResourceMark rm; 651 LogStream ls(lt); 652 ls.print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT, os::num_mallocs, os::num_frees); 653 ls.print_cr("## memory stomp:"); 654 guarded.print_on(&ls); 655 fatal("memory stomping error"); 656 } 657 } 658 659 #endif 660 661 // 662 // This function supports testing of the malloc out of memory 663 // condition without really running the system out of memory. 664 // 665 static bool has_reached_max_malloc_test_peak(size_t alloc_size) { 666 if (MallocMaxTestWords > 0) { 667 size_t words = (alloc_size / BytesPerWord); 668 669 if ((cur_malloc_words + words) > MallocMaxTestWords) { 670 return true; 671 } 672 Atomic::add(words, &cur_malloc_words); 673 } 674 return false; 675 } 676 677 void* os::malloc(size_t size, MEMFLAGS flags) { 678 return os::malloc(size, flags, CALLER_PC); 679 } 680 681 void* os::malloc(size_t size, MEMFLAGS memflags, const NativeCallStack& stack) { 682 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); 683 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); 684 685 // Since os::malloc can be called when the libjvm.{dll,so} is 686 // first loaded and we don't have a thread yet we must accept NULL also here. 687 assert(!os::ThreadCrashProtection::is_crash_protected(Thread::current_or_null()), 688 "malloc() not allowed when crash protection is set"); 689 690 if (size == 0) { 691 // return a valid pointer if size is zero 692 // if NULL is returned the calling functions assume out of memory. 693 size = 1; 694 } 695 696 // NMT support 697 NMT_TrackingLevel level = MemTracker::tracking_level(); 698 size_t nmt_header_size = MemTracker::malloc_header_size(level); 699 700 #ifndef ASSERT 701 const size_t alloc_size = size + nmt_header_size; 702 #else 703 const size_t alloc_size = GuardedMemory::get_total_size(size + nmt_header_size); 704 if (size + nmt_header_size > alloc_size) { // Check for rollover. 705 return NULL; 706 } 707 #endif 708 709 // For the test flag -XX:MallocMaxTestWords 710 if (has_reached_max_malloc_test_peak(size)) { 711 return NULL; 712 } 713 714 u_char* ptr; 715 ptr = (u_char*)::malloc(alloc_size); 716 717 #ifdef ASSERT 718 if (ptr == NULL) { 719 return NULL; 720 } 721 // Wrap memory with guard 722 GuardedMemory guarded(ptr, size + nmt_header_size); 723 ptr = guarded.get_user_ptr(); 724 725 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { 726 log_warning(malloc, free)("os::malloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, p2i(ptr)); 727 breakpoint(); 728 } 729 if (paranoid) { 730 verify_memory(ptr); 731 } 732 #endif 733 734 // we do not track guard memory 735 return MemTracker::record_malloc((address)ptr, size, memflags, stack, level); 736 } 737 738 void* os::realloc(void *memblock, size_t size, MEMFLAGS flags) { 739 return os::realloc(memblock, size, flags, CALLER_PC); 740 } 741 742 void* os::realloc(void *memblock, size_t size, MEMFLAGS memflags, const NativeCallStack& stack) { 743 744 // For the test flag -XX:MallocMaxTestWords 745 if (has_reached_max_malloc_test_peak(size)) { 746 return NULL; 747 } 748 749 if (size == 0) { 750 // return a valid pointer if size is zero 751 // if NULL is returned the calling functions assume out of memory. 752 size = 1; 753 } 754 755 #ifndef ASSERT 756 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); 757 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); 758 // NMT support 759 void* membase = MemTracker::record_free(memblock); 760 NMT_TrackingLevel level = MemTracker::tracking_level(); 761 size_t nmt_header_size = MemTracker::malloc_header_size(level); 762 void* ptr = ::realloc(membase, size + nmt_header_size); 763 return MemTracker::record_malloc(ptr, size, memflags, stack, level); 764 #else 765 if (memblock == NULL) { 766 return os::malloc(size, memflags, stack); 767 } 768 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { 769 log_warning(malloc, free)("os::realloc caught " PTR_FORMAT, p2i(memblock)); 770 breakpoint(); 771 } 772 // NMT support 773 void* membase = MemTracker::malloc_base(memblock); 774 verify_memory(membase); 775 // always move the block 776 void* ptr = os::malloc(size, memflags, stack); 777 // Copy to new memory if malloc didn't fail 778 if (ptr != NULL ) { 779 GuardedMemory guarded(MemTracker::malloc_base(memblock)); 780 // Guard's user data contains NMT header 781 size_t memblock_size = guarded.get_user_size() - MemTracker::malloc_header_size(memblock); 782 memcpy(ptr, memblock, MIN2(size, memblock_size)); 783 if (paranoid) { 784 verify_memory(MemTracker::malloc_base(ptr)); 785 } 786 os::free(memblock); 787 } 788 return ptr; 789 #endif 790 } 791 792 793 void os::free(void *memblock) { 794 NOT_PRODUCT(inc_stat_counter(&num_frees, 1)); 795 #ifdef ASSERT 796 if (memblock == NULL) return; 797 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { 798 log_warning(malloc, free)("os::free caught " PTR_FORMAT, p2i(memblock)); 799 breakpoint(); 800 } 801 void* membase = MemTracker::record_free(memblock); 802 verify_memory(membase); 803 804 GuardedMemory guarded(membase); 805 size_t size = guarded.get_user_size(); 806 inc_stat_counter(&free_bytes, size); 807 membase = guarded.release_for_freeing(); 808 ::free(membase); 809 #else 810 void* membase = MemTracker::record_free(memblock); 811 ::free(membase); 812 #endif 813 } 814 815 void os::init_random(unsigned int initval) { 816 _rand_seed = initval; 817 } 818 819 820 static int random_helper(unsigned int rand_seed) { 821 /* standard, well-known linear congruential random generator with 822 * next_rand = (16807*seed) mod (2**31-1) 823 * see 824 * (1) "Random Number Generators: Good Ones Are Hard to Find", 825 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), 826 * (2) "Two Fast Implementations of the 'Minimal Standard' Random 827 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. 828 */ 829 const unsigned int a = 16807; 830 const unsigned int m = 2147483647; 831 const int q = m / a; assert(q == 127773, "weird math"); 832 const int r = m % a; assert(r == 2836, "weird math"); 833 834 // compute az=2^31p+q 835 unsigned int lo = a * (rand_seed & 0xFFFF); 836 unsigned int hi = a * (rand_seed >> 16); 837 lo += (hi & 0x7FFF) << 16; 838 839 // if q overflowed, ignore the overflow and increment q 840 if (lo > m) { 841 lo &= m; 842 ++lo; 843 } 844 lo += hi >> 15; 845 846 // if (p+q) overflowed, ignore the overflow and increment (p+q) 847 if (lo > m) { 848 lo &= m; 849 ++lo; 850 } 851 return lo; 852 } 853 854 int os::random() { 855 // Make updating the random seed thread safe. 856 while (true) { 857 unsigned int seed = _rand_seed; 858 unsigned int rand = random_helper(seed); 859 if (Atomic::cmpxchg(rand, &_rand_seed, seed) == seed) { 860 return static_cast<int>(rand); 861 } 862 } 863 } 864 865 // The INITIALIZED state is distinguished from the SUSPENDED state because the 866 // conditions in which a thread is first started are different from those in which 867 // a suspension is resumed. These differences make it hard for us to apply the 868 // tougher checks when starting threads that we want to do when resuming them. 869 // However, when start_thread is called as a result of Thread.start, on a Java 870 // thread, the operation is synchronized on the Java Thread object. So there 871 // cannot be a race to start the thread and hence for the thread to exit while 872 // we are working on it. Non-Java threads that start Java threads either have 873 // to do so in a context in which races are impossible, or should do appropriate 874 // locking. 875 876 void os::start_thread(Thread* thread) { 877 // guard suspend/resume 878 MutexLocker ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); 879 OSThread* osthread = thread->osthread(); 880 osthread->set_state(RUNNABLE); 881 pd_start_thread(thread); 882 } 883 884 void os::abort(bool dump_core) { 885 abort(dump_core && CreateCoredumpOnCrash, NULL, NULL); 886 } 887 888 //--------------------------------------------------------------------------- 889 // Helper functions for fatal error handler 890 891 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { 892 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); 893 894 start = align_down(start, unitsize); 895 896 int cols = 0; 897 int cols_per_line = 0; 898 switch (unitsize) { 899 case 1: cols_per_line = 16; break; 900 case 2: cols_per_line = 8; break; 901 case 4: cols_per_line = 4; break; 902 case 8: cols_per_line = 2; break; 903 default: return; 904 } 905 906 address p = start; 907 st->print(PTR_FORMAT ": ", p2i(start)); 908 while (p < end) { 909 if (is_readable_pointer(p)) { 910 switch (unitsize) { 911 case 1: st->print("%02x", *(u1*)p); break; 912 case 2: st->print("%04x", *(u2*)p); break; 913 case 4: st->print("%08x", *(u4*)p); break; 914 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; 915 } 916 } else { 917 st->print("%*.*s", 2*unitsize, 2*unitsize, "????????????????"); 918 } 919 p += unitsize; 920 cols++; 921 if (cols >= cols_per_line && p < end) { 922 cols = 0; 923 st->cr(); 924 st->print(PTR_FORMAT ": ", p2i(p)); 925 } else { 926 st->print(" "); 927 } 928 } 929 st->cr(); 930 } 931 932 void os::print_instructions(outputStream* st, address pc, int unitsize) { 933 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc)); 934 print_hex_dump(st, pc - 256, pc + 256, unitsize); 935 } 936 937 void os::print_environment_variables(outputStream* st, const char** env_list) { 938 if (env_list) { 939 st->print_cr("Environment Variables:"); 940 941 for (int i = 0; env_list[i] != NULL; i++) { 942 char *envvar = ::getenv(env_list[i]); 943 if (envvar != NULL) { 944 st->print("%s", env_list[i]); 945 st->print("="); 946 st->print_cr("%s", envvar); 947 } 948 } 949 } 950 } 951 952 void os::print_cpu_info(outputStream* st, char* buf, size_t buflen) { 953 // cpu 954 st->print("CPU:"); 955 st->print("total %d", os::processor_count()); 956 // It's not safe to query number of active processors after crash 957 // st->print("(active %d)", os::active_processor_count()); but we can 958 // print the initial number of active processors. 959 // We access the raw value here because the assert in the accessor will 960 // fail if the crash occurs before initialization of this value. 961 st->print(" (initial active %d)", _initial_active_processor_count); 962 st->print(" %s", VM_Version::features_string()); 963 st->cr(); 964 pd_print_cpu_info(st, buf, buflen); 965 } 966 967 // Print a one line string summarizing the cpu, number of cores, memory, and operating system version 968 void os::print_summary_info(outputStream* st, char* buf, size_t buflen) { 969 st->print("Host: "); 970 #ifndef PRODUCT 971 if (get_host_name(buf, buflen)) { 972 st->print("%s, ", buf); 973 } 974 #endif // PRODUCT 975 get_summary_cpu_info(buf, buflen); 976 st->print("%s, ", buf); 977 size_t mem = physical_memory()/G; 978 if (mem == 0) { // for low memory systems 979 mem = physical_memory()/M; 980 st->print("%d cores, " SIZE_FORMAT "M, ", processor_count(), mem); 981 } else { 982 st->print("%d cores, " SIZE_FORMAT "G, ", processor_count(), mem); 983 } 984 get_summary_os_info(buf, buflen); 985 st->print_raw(buf); 986 st->cr(); 987 } 988 989 void os::print_date_and_time(outputStream *st, char* buf, size_t buflen) { 990 const int secs_per_day = 86400; 991 const int secs_per_hour = 3600; 992 const int secs_per_min = 60; 993 994 time_t tloc; 995 (void)time(&tloc); 996 char* timestring = ctime(&tloc); // ctime adds newline. 997 // edit out the newline 998 char* nl = strchr(timestring, '\n'); 999 if (nl != NULL) { 1000 *nl = '\0'; 1001 } 1002 1003 struct tm tz; 1004 if (localtime_pd(&tloc, &tz) != NULL) { 1005 ::strftime(buf, buflen, "%Z", &tz); 1006 st->print("Time: %s %s", timestring, buf); 1007 } else { 1008 st->print("Time: %s", timestring); 1009 } 1010 1011 double t = os::elapsedTime(); 1012 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in 1013 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int 1014 // before printf. We lost some precision, but who cares? 1015 int eltime = (int)t; // elapsed time in seconds 1016 1017 // print elapsed time in a human-readable format: 1018 int eldays = eltime / secs_per_day; 1019 int day_secs = eldays * secs_per_day; 1020 int elhours = (eltime - day_secs) / secs_per_hour; 1021 int hour_secs = elhours * secs_per_hour; 1022 int elmins = (eltime - day_secs - hour_secs) / secs_per_min; 1023 int minute_secs = elmins * secs_per_min; 1024 int elsecs = (eltime - day_secs - hour_secs - minute_secs); 1025 st->print_cr(" elapsed time: %d seconds (%dd %dh %dm %ds)", eltime, eldays, elhours, elmins, elsecs); 1026 } 1027 1028 1029 // Check if pointer can be read from (4-byte read access). 1030 // Helps to prove validity of a not-NULL pointer. 1031 // Returns true in very early stages of VM life when stub is not yet generated. 1032 #define SAFEFETCH_DEFAULT true 1033 bool os::is_readable_pointer(const void* p) { 1034 if (!CanUseSafeFetch32()) { 1035 return SAFEFETCH_DEFAULT; 1036 } 1037 int* const aligned = (int*) align_down((intptr_t)p, 4); 1038 int cafebabe = 0xcafebabe; // tester value 1 1039 int deadbeef = 0xdeadbeef; // tester value 2 1040 return (SafeFetch32(aligned, cafebabe) != cafebabe) || (SafeFetch32(aligned, deadbeef) != deadbeef); 1041 } 1042 1043 bool os::is_readable_range(const void* from, const void* to) { 1044 if ((uintptr_t)from >= (uintptr_t)to) return false; 1045 for (uintptr_t p = align_down((uintptr_t)from, min_page_size()); p < (uintptr_t)to; p += min_page_size()) { 1046 if (!is_readable_pointer((const void*)p)) { 1047 return false; 1048 } 1049 } 1050 return true; 1051 } 1052 1053 1054 // moved from debug.cpp (used to be find()) but still called from there 1055 // The verbose parameter is only set by the debug code in one case 1056 void os::print_location(outputStream* st, intptr_t x, bool verbose) { 1057 address addr = (address)x; 1058 // Handle NULL first, so later checks don't need to protect against it. 1059 if (addr == NULL) { 1060 st->print_cr("0x0 is NULL"); 1061 return; 1062 } 1063 1064 // Check if addr points into a code blob. 1065 CodeBlob* b = CodeCache::find_blob_unsafe(addr); 1066 if (b != NULL) { 1067 b->dump_for_addr(addr, st, verbose); 1068 return; 1069 } 1070 1071 // Check if addr points into Java heap. 1072 if (Universe::heap()->is_in(addr)) { 1073 oop o = oopDesc::oop_or_null(addr); 1074 if (o != NULL) { 1075 if ((HeapWord*)o == (HeapWord*)addr) { 1076 st->print(INTPTR_FORMAT " is an oop: ", p2i(addr)); 1077 } else { 1078 st->print(INTPTR_FORMAT " is pointing into object: " , p2i(addr)); 1079 } 1080 o->print_on(st); 1081 return; 1082 } 1083 } else if (Universe::heap()->is_in_reserved(addr)) { 1084 st->print_cr(INTPTR_FORMAT " is an unallocated location in the heap", p2i(addr)); 1085 return; 1086 } 1087 1088 // Compressed oop needs to be decoded first. 1089 #ifdef _LP64 1090 if (UseCompressedOops && ((uintptr_t)addr &~ (uintptr_t)max_juint) == 0) { 1091 narrowOop narrow_oop = (narrowOop)(uintptr_t)addr; 1092 oop o = CompressedOops::decode_raw(narrow_oop); 1093 1094 if (oopDesc::is_valid(o)) { 1095 st->print(UINT32_FORMAT " is a compressed pointer to object: ", narrow_oop); 1096 o->print_on(st); 1097 return; 1098 } 1099 } 1100 #endif 1101 1102 bool accessible = is_readable_pointer(addr); 1103 1104 // Check if addr is a JNI handle. 1105 if (align_down((intptr_t)addr, sizeof(intptr_t)) != 0 && accessible) { 1106 if (JNIHandles::is_global_handle((jobject) addr)) { 1107 st->print_cr(INTPTR_FORMAT " is a global jni handle", p2i(addr)); 1108 return; 1109 } 1110 if (JNIHandles::is_weak_global_handle((jobject) addr)) { 1111 st->print_cr(INTPTR_FORMAT " is a weak global jni handle", p2i(addr)); 1112 return; 1113 } 1114 #ifndef PRODUCT 1115 // we don't keep the block list in product mode 1116 if (JNIHandles::is_local_handle((jobject) addr)) { 1117 st->print_cr(INTPTR_FORMAT " is a local jni handle", p2i(addr)); 1118 return; 1119 } 1120 #endif 1121 } 1122 1123 // Check if addr belongs to a Java thread. 1124 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thread = jtiwh.next(); ) { 1125 // If the addr is a java thread print information about that. 1126 if (addr == (address)thread) { 1127 if (verbose) { 1128 thread->print_on(st); 1129 } else { 1130 st->print_cr(INTPTR_FORMAT " is a thread", p2i(addr)); 1131 } 1132 return; 1133 } 1134 // If the addr is in the stack region for this thread then report that 1135 // and print thread info 1136 if (thread->on_local_stack(addr)) { 1137 st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " 1138 INTPTR_FORMAT, p2i(addr), p2i(thread)); 1139 if (verbose) thread->print_on(st); 1140 return; 1141 } 1142 } 1143 1144 // Check if in metaspace and print types that have vptrs 1145 if (Metaspace::contains(addr)) { 1146 if (Klass::is_valid((Klass*)addr)) { 1147 st->print_cr(INTPTR_FORMAT " is a pointer to class: ", p2i(addr)); 1148 ((Klass*)addr)->print_on(st); 1149 } else if (Method::is_valid_method((const Method*)addr)) { 1150 ((Method*)addr)->print_value_on(st); 1151 st->cr(); 1152 } else { 1153 // Use addr->print() from the debugger instead (not here) 1154 st->print_cr(INTPTR_FORMAT " is pointing into metadata", p2i(addr)); 1155 } 1156 return; 1157 } 1158 1159 // Compressed klass needs to be decoded first. 1160 #ifdef _LP64 1161 if (UseCompressedClassPointers && ((uintptr_t)addr &~ (uintptr_t)max_juint) == 0) { 1162 narrowKlass narrow_klass = (narrowKlass)(uintptr_t)addr; 1163 Klass* k = CompressedKlassPointers::decode_raw(narrow_klass); 1164 1165 if (Klass::is_valid(k)) { 1166 st->print_cr(UINT32_FORMAT " is a compressed pointer to class: " INTPTR_FORMAT, narrow_klass, p2i((HeapWord*)k)); 1167 k->print_on(st); 1168 return; 1169 } 1170 } 1171 #endif 1172 1173 // Try an OS specific find 1174 if (os::find(addr, st)) { 1175 return; 1176 } 1177 1178 if (accessible) { 1179 st->print(INTPTR_FORMAT " points into unknown readable memory:", p2i(addr)); 1180 for (address p = addr; p < align_up(addr + 1, sizeof(intptr_t)); ++p) { 1181 st->print(" %02x", *(u1*)p); 1182 } 1183 st->cr(); 1184 return; 1185 } 1186 1187 st->print_cr(INTPTR_FORMAT " is an unknown value", p2i(addr)); 1188 } 1189 1190 // Looks like all platforms can use the same function to check if C 1191 // stack is walkable beyond current frame. The check for fp() is not 1192 // necessary on Sparc, but it's harmless. 1193 bool os::is_first_C_frame(frame* fr) { 1194 // Load up sp, fp, sender sp and sender fp, check for reasonable values. 1195 // Check usp first, because if that's bad the other accessors may fault 1196 // on some architectures. Ditto ufp second, etc. 1197 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); 1198 // sp on amd can be 32 bit aligned. 1199 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); 1200 1201 uintptr_t usp = (uintptr_t)fr->sp(); 1202 if ((usp & sp_align_mask) != 0) return true; 1203 1204 uintptr_t ufp = (uintptr_t)fr->fp(); 1205 if ((ufp & fp_align_mask) != 0) return true; 1206 1207 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); 1208 if ((old_sp & sp_align_mask) != 0) return true; 1209 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; 1210 1211 uintptr_t old_fp = (uintptr_t)fr->link(); 1212 if ((old_fp & fp_align_mask) != 0) return true; 1213 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; 1214 1215 // stack grows downwards; if old_fp is below current fp or if the stack 1216 // frame is too large, either the stack is corrupted or fp is not saved 1217 // on stack (i.e. on x86, ebp may be used as general register). The stack 1218 // is not walkable beyond current frame. 1219 if (old_fp < ufp) return true; 1220 if (old_fp - ufp > 64 * K) return true; 1221 1222 return false; 1223 } 1224 1225 1226 // Set up the boot classpath. 1227 1228 char* os::format_boot_path(const char* format_string, 1229 const char* home, 1230 int home_len, 1231 char fileSep, 1232 char pathSep) { 1233 assert((fileSep == '/' && pathSep == ':') || 1234 (fileSep == '\\' && pathSep == ';'), "unexpected separator chars"); 1235 1236 // Scan the format string to determine the length of the actual 1237 // boot classpath, and handle platform dependencies as well. 1238 int formatted_path_len = 0; 1239 const char* p; 1240 for (p = format_string; *p != 0; ++p) { 1241 if (*p == '%') formatted_path_len += home_len - 1; 1242 ++formatted_path_len; 1243 } 1244 1245 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1, mtInternal); 1246 if (formatted_path == NULL) { 1247 return NULL; 1248 } 1249 1250 // Create boot classpath from format, substituting separator chars and 1251 // java home directory. 1252 char* q = formatted_path; 1253 for (p = format_string; *p != 0; ++p) { 1254 switch (*p) { 1255 case '%': 1256 strcpy(q, home); 1257 q += home_len; 1258 break; 1259 case '/': 1260 *q++ = fileSep; 1261 break; 1262 case ':': 1263 *q++ = pathSep; 1264 break; 1265 default: 1266 *q++ = *p; 1267 } 1268 } 1269 *q = '\0'; 1270 1271 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); 1272 return formatted_path; 1273 } 1274 1275 // This function is a proxy to fopen, it tries to add a non standard flag ('e' or 'N') 1276 // that ensures automatic closing of the file on exec. If it can not find support in 1277 // the underlying c library, it will make an extra system call (fcntl) to ensure automatic 1278 // closing of the file on exec. 1279 FILE* os::fopen(const char* path, const char* mode) { 1280 char modified_mode[20]; 1281 assert(strlen(mode) + 1 < sizeof(modified_mode), "mode chars plus one extra must fit in buffer"); 1282 sprintf(modified_mode, "%s" LINUX_ONLY("e") BSD_ONLY("e") WINDOWS_ONLY("N"), mode); 1283 FILE* file = ::fopen(path, modified_mode); 1284 1285 #if !(defined LINUX || defined BSD || defined _WINDOWS) 1286 // assume fcntl FD_CLOEXEC support as a backup solution when 'e' or 'N' 1287 // is not supported as mode in fopen 1288 if (file != NULL) { 1289 int fd = fileno(file); 1290 if (fd != -1) { 1291 int fd_flags = fcntl(fd, F_GETFD); 1292 if (fd_flags != -1) { 1293 fcntl(fd, F_SETFD, fd_flags | FD_CLOEXEC); 1294 } 1295 } 1296 } 1297 #endif 1298 1299 return file; 1300 } 1301 1302 bool os::set_boot_path(char fileSep, char pathSep) { 1303 const char* home = Arguments::get_java_home(); 1304 int home_len = (int)strlen(home); 1305 1306 struct stat st; 1307 1308 // modular image if "modules" jimage exists 1309 char* jimage = format_boot_path("%/lib/" MODULES_IMAGE_NAME, home, home_len, fileSep, pathSep); 1310 if (jimage == NULL) return false; 1311 bool has_jimage = (os::stat(jimage, &st) == 0); 1312 if (has_jimage) { 1313 Arguments::set_sysclasspath(jimage, true); 1314 FREE_C_HEAP_ARRAY(char, jimage); 1315 return true; 1316 } 1317 FREE_C_HEAP_ARRAY(char, jimage); 1318 1319 // check if developer build with exploded modules 1320 char* base_classes = format_boot_path("%/modules/" JAVA_BASE_NAME, home, home_len, fileSep, pathSep); 1321 if (base_classes == NULL) return false; 1322 if (os::stat(base_classes, &st) == 0) { 1323 Arguments::set_sysclasspath(base_classes, false); 1324 FREE_C_HEAP_ARRAY(char, base_classes); 1325 return true; 1326 } 1327 FREE_C_HEAP_ARRAY(char, base_classes); 1328 1329 return false; 1330 } 1331 1332 /* 1333 * Splits a path, based on its separator, the number of 1334 * elements is returned back in n. 1335 * It is the callers responsibility to: 1336 * a> check the value of n, and n may be 0. 1337 * b> ignore any empty path elements 1338 * c> free up the data. 1339 */ 1340 char** os::split_path(const char* path, int* n) { 1341 *n = 0; 1342 if (path == NULL || strlen(path) == 0) { 1343 return NULL; 1344 } 1345 const char psepchar = *os::path_separator(); 1346 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1, mtInternal); 1347 if (inpath == NULL) { 1348 return NULL; 1349 } 1350 strcpy(inpath, path); 1351 int count = 1; 1352 char* p = strchr(inpath, psepchar); 1353 // Get a count of elements to allocate memory 1354 while (p != NULL) { 1355 count++; 1356 p++; 1357 p = strchr(p, psepchar); 1358 } 1359 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count, mtInternal); 1360 if (opath == NULL) { 1361 return NULL; 1362 } 1363 1364 // do the actual splitting 1365 p = inpath; 1366 for (int i = 0 ; i < count ; i++) { 1367 size_t len = strcspn(p, os::path_separator()); 1368 if (len > JVM_MAXPATHLEN) { 1369 return NULL; 1370 } 1371 // allocate the string and add terminator storage 1372 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 1373 if (s == NULL) { 1374 return NULL; 1375 } 1376 strncpy(s, p, len); 1377 s[len] = '\0'; 1378 opath[i] = s; 1379 p += len + 1; 1380 } 1381 FREE_C_HEAP_ARRAY(char, inpath); 1382 *n = count; 1383 return opath; 1384 } 1385 1386 // Returns true if the current stack pointer is above the stack shadow 1387 // pages, false otherwise. 1388 bool os::stack_shadow_pages_available(Thread *thread, const methodHandle& method, address sp) { 1389 if (!thread->is_Java_thread()) return false; 1390 // Check if we have StackShadowPages above the yellow zone. This parameter 1391 // is dependent on the depth of the maximum VM call stack possible from 1392 // the handler for stack overflow. 'instanceof' in the stack overflow 1393 // handler or a println uses at least 8k stack of VM and native code 1394 // respectively. 1395 const int framesize_in_bytes = 1396 Interpreter::size_top_interpreter_activation(method()) * wordSize; 1397 1398 address limit = ((JavaThread*)thread)->stack_end() + 1399 (JavaThread::stack_guard_zone_size() + JavaThread::stack_shadow_zone_size()); 1400 1401 return sp > (limit + framesize_in_bytes); 1402 } 1403 1404 size_t os::page_size_for_region(size_t region_size, size_t min_pages, bool must_be_aligned) { 1405 assert(min_pages > 0, "sanity"); 1406 if (UseLargePages) { 1407 const size_t max_page_size = region_size / min_pages; 1408 1409 for (size_t i = 0; _page_sizes[i] != 0; ++i) { 1410 const size_t page_size = _page_sizes[i]; 1411 if (page_size <= max_page_size) { 1412 if (!must_be_aligned || is_aligned(region_size, page_size)) { 1413 return page_size; 1414 } 1415 } 1416 } 1417 } 1418 1419 return vm_page_size(); 1420 } 1421 1422 size_t os::page_size_for_region_aligned(size_t region_size, size_t min_pages) { 1423 return page_size_for_region(region_size, min_pages, true); 1424 } 1425 1426 size_t os::page_size_for_region_unaligned(size_t region_size, size_t min_pages) { 1427 return page_size_for_region(region_size, min_pages, false); 1428 } 1429 1430 static const char* errno_to_string (int e, bool short_text) { 1431 #define ALL_SHARED_ENUMS(X) \ 1432 X(E2BIG, "Argument list too long") \ 1433 X(EACCES, "Permission denied") \ 1434 X(EADDRINUSE, "Address in use") \ 1435 X(EADDRNOTAVAIL, "Address not available") \ 1436 X(EAFNOSUPPORT, "Address family not supported") \ 1437 X(EAGAIN, "Resource unavailable, try again") \ 1438 X(EALREADY, "Connection already in progress") \ 1439 X(EBADF, "Bad file descriptor") \ 1440 X(EBADMSG, "Bad message") \ 1441 X(EBUSY, "Device or resource busy") \ 1442 X(ECANCELED, "Operation canceled") \ 1443 X(ECHILD, "No child processes") \ 1444 X(ECONNABORTED, "Connection aborted") \ 1445 X(ECONNREFUSED, "Connection refused") \ 1446 X(ECONNRESET, "Connection reset") \ 1447 X(EDEADLK, "Resource deadlock would occur") \ 1448 X(EDESTADDRREQ, "Destination address required") \ 1449 X(EDOM, "Mathematics argument out of domain of function") \ 1450 X(EEXIST, "File exists") \ 1451 X(EFAULT, "Bad address") \ 1452 X(EFBIG, "File too large") \ 1453 X(EHOSTUNREACH, "Host is unreachable") \ 1454 X(EIDRM, "Identifier removed") \ 1455 X(EILSEQ, "Illegal byte sequence") \ 1456 X(EINPROGRESS, "Operation in progress") \ 1457 X(EINTR, "Interrupted function") \ 1458 X(EINVAL, "Invalid argument") \ 1459 X(EIO, "I/O error") \ 1460 X(EISCONN, "Socket is connected") \ 1461 X(EISDIR, "Is a directory") \ 1462 X(ELOOP, "Too many levels of symbolic links") \ 1463 X(EMFILE, "Too many open files") \ 1464 X(EMLINK, "Too many links") \ 1465 X(EMSGSIZE, "Message too large") \ 1466 X(ENAMETOOLONG, "Filename too long") \ 1467 X(ENETDOWN, "Network is down") \ 1468 X(ENETRESET, "Connection aborted by network") \ 1469 X(ENETUNREACH, "Network unreachable") \ 1470 X(ENFILE, "Too many files open in system") \ 1471 X(ENOBUFS, "No buffer space available") \ 1472 X(ENODATA, "No message is available on the STREAM head read queue") \ 1473 X(ENODEV, "No such device") \ 1474 X(ENOENT, "No such file or directory") \ 1475 X(ENOEXEC, "Executable file format error") \ 1476 X(ENOLCK, "No locks available") \ 1477 X(ENOLINK, "Reserved") \ 1478 X(ENOMEM, "Not enough space") \ 1479 X(ENOMSG, "No message of the desired type") \ 1480 X(ENOPROTOOPT, "Protocol not available") \ 1481 X(ENOSPC, "No space left on device") \ 1482 X(ENOSR, "No STREAM resources") \ 1483 X(ENOSTR, "Not a STREAM") \ 1484 X(ENOSYS, "Function not supported") \ 1485 X(ENOTCONN, "The socket is not connected") \ 1486 X(ENOTDIR, "Not a directory") \ 1487 X(ENOTEMPTY, "Directory not empty") \ 1488 X(ENOTSOCK, "Not a socket") \ 1489 X(ENOTSUP, "Not supported") \ 1490 X(ENOTTY, "Inappropriate I/O control operation") \ 1491 X(ENXIO, "No such device or address") \ 1492 X(EOPNOTSUPP, "Operation not supported on socket") \ 1493 X(EOVERFLOW, "Value too large to be stored in data type") \ 1494 X(EPERM, "Operation not permitted") \ 1495 X(EPIPE, "Broken pipe") \ 1496 X(EPROTO, "Protocol error") \ 1497 X(EPROTONOSUPPORT, "Protocol not supported") \ 1498 X(EPROTOTYPE, "Protocol wrong type for socket") \ 1499 X(ERANGE, "Result too large") \ 1500 X(EROFS, "Read-only file system") \ 1501 X(ESPIPE, "Invalid seek") \ 1502 X(ESRCH, "No such process") \ 1503 X(ETIME, "Stream ioctl() timeout") \ 1504 X(ETIMEDOUT, "Connection timed out") \ 1505 X(ETXTBSY, "Text file busy") \ 1506 X(EWOULDBLOCK, "Operation would block") \ 1507 X(EXDEV, "Cross-device link") 1508 1509 #define DEFINE_ENTRY(e, text) { e, #e, text }, 1510 1511 static const struct { 1512 int v; 1513 const char* short_text; 1514 const char* long_text; 1515 } table [] = { 1516 1517 ALL_SHARED_ENUMS(DEFINE_ENTRY) 1518 1519 // The following enums are not defined on all platforms. 1520 #ifdef ESTALE 1521 DEFINE_ENTRY(ESTALE, "Reserved") 1522 #endif 1523 #ifdef EDQUOT 1524 DEFINE_ENTRY(EDQUOT, "Reserved") 1525 #endif 1526 #ifdef EMULTIHOP 1527 DEFINE_ENTRY(EMULTIHOP, "Reserved") 1528 #endif 1529 1530 // End marker. 1531 { -1, "Unknown errno", "Unknown error" } 1532 1533 }; 1534 1535 #undef DEFINE_ENTRY 1536 #undef ALL_FLAGS 1537 1538 int i = 0; 1539 while (table[i].v != -1 && table[i].v != e) { 1540 i ++; 1541 } 1542 1543 return short_text ? table[i].short_text : table[i].long_text; 1544 1545 } 1546 1547 const char* os::strerror(int e) { 1548 return errno_to_string(e, false); 1549 } 1550 1551 const char* os::errno_name(int e) { 1552 return errno_to_string(e, true); 1553 } 1554 1555 void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count) { 1556 LogTarget(Info, pagesize) log; 1557 if (log.is_enabled()) { 1558 LogStream out(log); 1559 1560 out.print("%s: ", str); 1561 for (int i = 0; i < count; ++i) { 1562 out.print(" " SIZE_FORMAT, page_sizes[i]); 1563 } 1564 out.cr(); 1565 } 1566 } 1567 1568 #define trace_page_size_params(size) byte_size_in_exact_unit(size), exact_unit_for_byte_size(size) 1569 1570 void os::trace_page_sizes(const char* str, 1571 const size_t region_min_size, 1572 const size_t region_max_size, 1573 const size_t page_size, 1574 const char* base, 1575 const size_t size) { 1576 1577 log_info(pagesize)("%s: " 1578 " min=" SIZE_FORMAT "%s" 1579 " max=" SIZE_FORMAT "%s" 1580 " base=" PTR_FORMAT 1581 " page_size=" SIZE_FORMAT "%s" 1582 " size=" SIZE_FORMAT "%s", 1583 str, 1584 trace_page_size_params(region_min_size), 1585 trace_page_size_params(region_max_size), 1586 p2i(base), 1587 trace_page_size_params(page_size), 1588 trace_page_size_params(size)); 1589 } 1590 1591 void os::trace_page_sizes_for_requested_size(const char* str, 1592 const size_t requested_size, 1593 const size_t page_size, 1594 const size_t alignment, 1595 const char* base, 1596 const size_t size) { 1597 1598 log_info(pagesize)("%s:" 1599 " req_size=" SIZE_FORMAT "%s" 1600 " base=" PTR_FORMAT 1601 " page_size=" SIZE_FORMAT "%s" 1602 " alignment=" SIZE_FORMAT "%s" 1603 " size=" SIZE_FORMAT "%s", 1604 str, 1605 trace_page_size_params(requested_size), 1606 p2i(base), 1607 trace_page_size_params(page_size), 1608 trace_page_size_params(alignment), 1609 trace_page_size_params(size)); 1610 } 1611 1612 1613 // This is the working definition of a server class machine: 1614 // >= 2 physical CPU's and >=2GB of memory, with some fuzz 1615 // because the graphics memory (?) sometimes masks physical memory. 1616 // If you want to change the definition of a server class machine 1617 // on some OS or platform, e.g., >=4GB on Windows platforms, 1618 // then you'll have to parameterize this method based on that state, 1619 // as was done for logical processors here, or replicate and 1620 // specialize this method for each platform. (Or fix os to have 1621 // some inheritance structure and use subclassing. Sigh.) 1622 // If you want some platform to always or never behave as a server 1623 // class machine, change the setting of AlwaysActAsServerClassMachine 1624 // and NeverActAsServerClassMachine in globals*.hpp. 1625 bool os::is_server_class_machine() { 1626 // First check for the early returns 1627 if (NeverActAsServerClassMachine) { 1628 return false; 1629 } 1630 if (AlwaysActAsServerClassMachine) { 1631 return true; 1632 } 1633 // Then actually look at the machine 1634 bool result = false; 1635 const unsigned int server_processors = 2; 1636 const julong server_memory = 2UL * G; 1637 // We seem not to get our full complement of memory. 1638 // We allow some part (1/8?) of the memory to be "missing", 1639 // based on the sizes of DIMMs, and maybe graphics cards. 1640 const julong missing_memory = 256UL * M; 1641 1642 /* Is this a server class machine? */ 1643 if ((os::active_processor_count() >= (int)server_processors) && 1644 (os::physical_memory() >= (server_memory - missing_memory))) { 1645 const unsigned int logical_processors = 1646 VM_Version::logical_processors_per_package(); 1647 if (logical_processors > 1) { 1648 const unsigned int physical_packages = 1649 os::active_processor_count() / logical_processors; 1650 if (physical_packages >= server_processors) { 1651 result = true; 1652 } 1653 } else { 1654 result = true; 1655 } 1656 } 1657 return result; 1658 } 1659 1660 void os::initialize_initial_active_processor_count() { 1661 assert(_initial_active_processor_count == 0, "Initial active processor count already set."); 1662 _initial_active_processor_count = active_processor_count(); 1663 log_debug(os)("Initial active processor count set to %d" , _initial_active_processor_count); 1664 } 1665 1666 void os::SuspendedThreadTask::run() { 1667 internal_do_task(); 1668 _done = true; 1669 } 1670 1671 bool os::create_stack_guard_pages(char* addr, size_t bytes) { 1672 return os::pd_create_stack_guard_pages(addr, bytes); 1673 } 1674 1675 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint, int file_desc) { 1676 char* result = NULL; 1677 1678 if (file_desc != -1) { 1679 // Could have called pd_reserve_memory() followed by replace_existing_mapping_with_file_mapping(), 1680 // but AIX may use SHM in which case its more trouble to detach the segment and remap memory to the file. 1681 result = os::map_memory_to_file(addr, bytes, file_desc); 1682 if (result != NULL) { 1683 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, CALLER_PC); 1684 } 1685 } else { 1686 result = pd_reserve_memory(bytes, addr, alignment_hint); 1687 if (result != NULL) { 1688 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1689 } 1690 } 1691 1692 return result; 1693 } 1694 1695 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint, 1696 MEMFLAGS flags) { 1697 char* result = pd_reserve_memory(bytes, addr, alignment_hint); 1698 if (result != NULL) { 1699 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1700 MemTracker::record_virtual_memory_type((address)result, flags); 1701 } 1702 1703 return result; 1704 } 1705 1706 char* os::attempt_reserve_memory_at(size_t bytes, char* addr, int file_desc) { 1707 char* result = NULL; 1708 if (file_desc != -1) { 1709 result = pd_attempt_reserve_memory_at(bytes, addr, file_desc); 1710 if (result != NULL) { 1711 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, CALLER_PC); 1712 } 1713 } else { 1714 result = pd_attempt_reserve_memory_at(bytes, addr); 1715 if (result != NULL) { 1716 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); 1717 } 1718 } 1719 return result; 1720 } 1721 1722 void os::split_reserved_memory(char *base, size_t size, 1723 size_t split, bool realloc) { 1724 pd_split_reserved_memory(base, size, split, realloc); 1725 } 1726 1727 bool os::commit_memory(char* addr, size_t bytes, bool executable) { 1728 bool res = pd_commit_memory(addr, bytes, executable); 1729 if (res) { 1730 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); 1731 } 1732 return res; 1733 } 1734 1735 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, 1736 bool executable) { 1737 bool res = os::pd_commit_memory(addr, size, alignment_hint, executable); 1738 if (res) { 1739 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); 1740 } 1741 return res; 1742 } 1743 1744 void os::commit_memory_or_exit(char* addr, size_t bytes, bool executable, 1745 const char* mesg) { 1746 pd_commit_memory_or_exit(addr, bytes, executable, mesg); 1747 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); 1748 } 1749 1750 void os::commit_memory_or_exit(char* addr, size_t size, size_t alignment_hint, 1751 bool executable, const char* mesg) { 1752 os::pd_commit_memory_or_exit(addr, size, alignment_hint, executable, mesg); 1753 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); 1754 } 1755 1756 bool os::uncommit_memory(char* addr, size_t bytes) { 1757 bool res; 1758 if (MemTracker::tracking_level() > NMT_minimal) { 1759 Tracker tkr(Tracker::uncommit); 1760 res = pd_uncommit_memory(addr, bytes); 1761 if (res) { 1762 tkr.record((address)addr, bytes); 1763 } 1764 } else { 1765 res = pd_uncommit_memory(addr, bytes); 1766 } 1767 return res; 1768 } 1769 1770 bool os::release_memory(char* addr, size_t bytes) { 1771 bool res; 1772 if (MemTracker::tracking_level() > NMT_minimal) { 1773 Tracker tkr(Tracker::release); 1774 res = pd_release_memory(addr, bytes); 1775 if (res) { 1776 tkr.record((address)addr, bytes); 1777 } 1778 } else { 1779 res = pd_release_memory(addr, bytes); 1780 } 1781 return res; 1782 } 1783 1784 void os::pretouch_memory(void* start, void* end, size_t page_size) { 1785 for (volatile char *p = (char*)start; p < (char*)end; p += page_size) { 1786 *p = 0; 1787 } 1788 } 1789 1790 char* os::map_memory(int fd, const char* file_name, size_t file_offset, 1791 char *addr, size_t bytes, bool read_only, 1792 bool allow_exec) { 1793 char* result = pd_map_memory(fd, file_name, file_offset, addr, bytes, read_only, allow_exec); 1794 if (result != NULL) { 1795 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, CALLER_PC); 1796 } 1797 return result; 1798 } 1799 1800 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 1801 char *addr, size_t bytes, bool read_only, 1802 bool allow_exec) { 1803 return pd_remap_memory(fd, file_name, file_offset, addr, bytes, 1804 read_only, allow_exec); 1805 } 1806 1807 bool os::unmap_memory(char *addr, size_t bytes) { 1808 bool result; 1809 if (MemTracker::tracking_level() > NMT_minimal) { 1810 Tracker tkr(Tracker::release); 1811 result = pd_unmap_memory(addr, bytes); 1812 if (result) { 1813 tkr.record((address)addr, bytes); 1814 } 1815 } else { 1816 result = pd_unmap_memory(addr, bytes); 1817 } 1818 return result; 1819 } 1820 1821 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { 1822 pd_free_memory(addr, bytes, alignment_hint); 1823 } 1824 1825 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 1826 pd_realign_memory(addr, bytes, alignment_hint); 1827 } 1828 1829 #ifndef _WINDOWS 1830 /* try to switch state from state "from" to state "to" 1831 * returns the state set after the method is complete 1832 */ 1833 os::SuspendResume::State os::SuspendResume::switch_state(os::SuspendResume::State from, 1834 os::SuspendResume::State to) 1835 { 1836 os::SuspendResume::State result = Atomic::cmpxchg(to, &_state, from); 1837 if (result == from) { 1838 // success 1839 return to; 1840 } 1841 return result; 1842 } 1843 #endif