1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaClasses.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/icBuffer.hpp" 31 #include "code/vtableStubs.hpp" 32 #include "gc_implementation/shared/vmGCOperations.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "memory/allocation.inline.hpp" 35 #include "oops/oop.inline.hpp" 36 #include "prims/jvm.h" 37 #include "prims/jvm_misc.hpp" 38 #include "prims/privilegedStack.hpp" 39 #include "runtime/arguments.hpp" 40 #include "runtime/frame.inline.hpp" 41 #include "runtime/interfaceSupport.hpp" 42 #include "runtime/java.hpp" 43 #include "runtime/javaCalls.hpp" 44 #include "runtime/mutexLocker.hpp" 45 #include "runtime/os.hpp" 46 #include "runtime/stubRoutines.hpp" 47 #include "runtime/thread.inline.hpp" 48 #include "services/attachListener.hpp" 49 #include "services/memTracker.hpp" 50 #include "services/threadService.hpp" 51 #include "utilities/defaultStream.hpp" 52 #include "utilities/events.hpp" 53 #ifdef TARGET_OS_FAMILY_linux 54 # include "os_linux.inline.hpp" 55 #endif 56 #ifdef TARGET_OS_FAMILY_solaris 57 # include "os_solaris.inline.hpp" 58 #endif 59 #ifdef TARGET_OS_FAMILY_windows 60 # include "os_windows.inline.hpp" 61 #endif 62 #ifdef TARGET_OS_FAMILY_bsd 63 # include "os_bsd.inline.hpp" 64 #endif 65 66 # include <signal.h> 67 68 OSThread* os::_starting_thread = NULL; 69 address os::_polling_page = NULL; 70 volatile int32_t* os::_mem_serialize_page = NULL; 71 uintptr_t os::_serialize_page_mask = 0; 72 long os::_rand_seed = 1; 73 int os::_processor_count = 0; 74 size_t os::_page_sizes[os::page_sizes_max]; 75 76 #ifndef PRODUCT 77 julong os::num_mallocs = 0; // # of calls to malloc/realloc 78 julong os::alloc_bytes = 0; // # of bytes allocated 79 julong os::num_frees = 0; // # of calls to free 80 julong os::free_bytes = 0; // # of bytes freed 81 #endif 82 83 static juint cur_malloc_words = 0; // current size for MallocMaxTestWords 84 85 void os_init_globals() { 86 // Called from init_globals(). 87 // See Threads::create_vm() in thread.cpp, and init.cpp. 88 os::init_globals(); 89 } 90 91 // Fill in buffer with current local time as an ISO-8601 string. 92 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. 93 // Returns buffer, or NULL if it failed. 94 // This would mostly be a call to 95 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) 96 // except that on Windows the %z behaves badly, so we do it ourselves. 97 // Also, people wanted milliseconds on there, 98 // and strftime doesn't do milliseconds. 99 char* os::iso8601_time(char* buffer, size_t buffer_length) { 100 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" 101 // 1 2 102 // 12345678901234567890123456789 103 static const char* iso8601_format = 104 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d"; 105 static const size_t needed_buffer = 29; 106 107 // Sanity check the arguments 108 if (buffer == NULL) { 109 assert(false, "NULL buffer"); 110 return NULL; 111 } 112 if (buffer_length < needed_buffer) { 113 assert(false, "buffer_length too small"); 114 return NULL; 115 } 116 // Get the current time 117 jlong milliseconds_since_19700101 = javaTimeMillis(); 118 const int milliseconds_per_microsecond = 1000; 119 const time_t seconds_since_19700101 = 120 milliseconds_since_19700101 / milliseconds_per_microsecond; 121 const int milliseconds_after_second = 122 milliseconds_since_19700101 % milliseconds_per_microsecond; 123 // Convert the time value to a tm and timezone variable 124 struct tm time_struct; 125 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { 126 assert(false, "Failed localtime_pd"); 127 return NULL; 128 } 129 #if defined(_ALLBSD_SOURCE) 130 const time_t zone = (time_t) time_struct.tm_gmtoff; 131 #else 132 const time_t zone = timezone; 133 #endif 134 135 // If daylight savings time is in effect, 136 // we are 1 hour East of our time zone 137 const time_t seconds_per_minute = 60; 138 const time_t minutes_per_hour = 60; 139 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; 140 time_t UTC_to_local = zone; 141 if (time_struct.tm_isdst > 0) { 142 UTC_to_local = UTC_to_local - seconds_per_hour; 143 } 144 // Compute the time zone offset. 145 // localtime_pd() sets timezone to the difference (in seconds) 146 // between UTC and and local time. 147 // ISO 8601 says we need the difference between local time and UTC, 148 // we change the sign of the localtime_pd() result. 149 const time_t local_to_UTC = -(UTC_to_local); 150 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. 151 char sign_local_to_UTC = '+'; 152 time_t abs_local_to_UTC = local_to_UTC; 153 if (local_to_UTC < 0) { 154 sign_local_to_UTC = '-'; 155 abs_local_to_UTC = -(abs_local_to_UTC); 156 } 157 // Convert time zone offset seconds to hours and minutes. 158 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); 159 const time_t zone_min = 160 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); 161 162 // Print an ISO 8601 date and time stamp into the buffer 163 const int year = 1900 + time_struct.tm_year; 164 const int month = 1 + time_struct.tm_mon; 165 const int printed = jio_snprintf(buffer, buffer_length, iso8601_format, 166 year, 167 month, 168 time_struct.tm_mday, 169 time_struct.tm_hour, 170 time_struct.tm_min, 171 time_struct.tm_sec, 172 milliseconds_after_second, 173 sign_local_to_UTC, 174 zone_hours, 175 zone_min); 176 if (printed == 0) { 177 assert(false, "Failed jio_printf"); 178 return NULL; 179 } 180 return buffer; 181 } 182 183 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { 184 #ifdef ASSERT 185 if (!(!thread->is_Java_thread() || 186 Thread::current() == thread || 187 Threads_lock->owned_by_self() 188 || thread->is_Compiler_thread() 189 )) { 190 assert(false, "possibility of dangling Thread pointer"); 191 } 192 #endif 193 194 if (p >= MinPriority && p <= MaxPriority) { 195 int priority = java_to_os_priority[p]; 196 return set_native_priority(thread, priority); 197 } else { 198 assert(false, "Should not happen"); 199 return OS_ERR; 200 } 201 } 202 203 // The mapping from OS priority back to Java priority may be inexact because 204 // Java priorities can map M:1 with native priorities. If you want the definite 205 // Java priority then use JavaThread::java_priority() 206 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { 207 int p; 208 int os_prio; 209 OSReturn ret = get_native_priority(thread, &os_prio); 210 if (ret != OS_OK) return ret; 211 212 if (java_to_os_priority[MaxPriority] > java_to_os_priority[MinPriority]) { 213 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; 214 } else { 215 // niceness values are in reverse order 216 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] < os_prio; p--) ; 217 } 218 priority = (ThreadPriority)p; 219 return OS_OK; 220 } 221 222 223 // --------------------- sun.misc.Signal (optional) --------------------- 224 225 226 // SIGBREAK is sent by the keyboard to query the VM state 227 #ifndef SIGBREAK 228 #define SIGBREAK SIGQUIT 229 #endif 230 231 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. 232 233 234 static void signal_thread_entry(JavaThread* thread, TRAPS) { 235 os::set_priority(thread, NearMaxPriority); 236 while (true) { 237 int sig; 238 { 239 // FIXME : Currently we have not decieded what should be the status 240 // for this java thread blocked here. Once we decide about 241 // that we should fix this. 242 sig = os::signal_wait(); 243 } 244 if (sig == os::sigexitnum_pd()) { 245 // Terminate the signal thread 246 return; 247 } 248 249 switch (sig) { 250 case SIGBREAK: { 251 // Check if the signal is a trigger to start the Attach Listener - in that 252 // case don't print stack traces. 253 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { 254 continue; 255 } 256 // Print stack traces 257 // Any SIGBREAK operations added here should make sure to flush 258 // the output stream (e.g. tty->flush()) after output. See 4803766. 259 // Each module also prints an extra carriage return after its output. 260 VM_PrintThreads op; 261 VMThread::execute(&op); 262 VM_PrintJNI jni_op; 263 VMThread::execute(&jni_op); 264 VM_FindDeadlocks op1(tty); 265 VMThread::execute(&op1); 266 Universe::print_heap_at_SIGBREAK(); 267 if (PrintClassHistogram) { 268 VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */); 269 VMThread::execute(&op1); 270 } 271 if (JvmtiExport::should_post_data_dump()) { 272 JvmtiExport::post_data_dump(); 273 } 274 break; 275 } 276 default: { 277 // Dispatch the signal to java 278 HandleMark hm(THREAD); 279 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_Signal(), THREAD); 280 KlassHandle klass (THREAD, k); 281 if (klass.not_null()) { 282 JavaValue result(T_VOID); 283 JavaCallArguments args; 284 args.push_int(sig); 285 JavaCalls::call_static( 286 &result, 287 klass, 288 vmSymbols::dispatch_name(), 289 vmSymbols::int_void_signature(), 290 &args, 291 THREAD 292 ); 293 } 294 if (HAS_PENDING_EXCEPTION) { 295 // tty is initialized early so we don't expect it to be null, but 296 // if it is we can't risk doing an initialization that might 297 // trigger additional out-of-memory conditions 298 if (tty != NULL) { 299 char klass_name[256]; 300 char tmp_sig_name[16]; 301 const char* sig_name = "UNKNOWN"; 302 InstanceKlass::cast(PENDING_EXCEPTION->klass())-> 303 name()->as_klass_external_name(klass_name, 256); 304 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) 305 sig_name = tmp_sig_name; 306 warning("Exception %s occurred dispatching signal %s to handler" 307 "- the VM may need to be forcibly terminated", 308 klass_name, sig_name ); 309 } 310 CLEAR_PENDING_EXCEPTION; 311 } 312 } 313 } 314 } 315 } 316 317 318 void os::signal_init() { 319 if (!ReduceSignalUsage) { 320 // Setup JavaThread for processing signals 321 EXCEPTION_MARK; 322 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); 323 instanceKlassHandle klass (THREAD, k); 324 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); 325 326 const char thread_name[] = "Signal Dispatcher"; 327 Handle string = java_lang_String::create_from_str(thread_name, CHECK); 328 329 // Initialize thread_oop to put it into the system threadGroup 330 Handle thread_group (THREAD, Universe::system_thread_group()); 331 JavaValue result(T_VOID); 332 JavaCalls::call_special(&result, thread_oop, 333 klass, 334 vmSymbols::object_initializer_name(), 335 vmSymbols::threadgroup_string_void_signature(), 336 thread_group, 337 string, 338 CHECK); 339 340 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); 341 JavaCalls::call_special(&result, 342 thread_group, 343 group, 344 vmSymbols::add_method_name(), 345 vmSymbols::thread_void_signature(), 346 thread_oop, // ARG 1 347 CHECK); 348 349 os::signal_init_pd(); 350 351 { MutexLocker mu(Threads_lock); 352 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); 353 354 // At this point it may be possible that no osthread was created for the 355 // JavaThread due to lack of memory. We would have to throw an exception 356 // in that case. However, since this must work and we do not allow 357 // exceptions anyway, check and abort if this fails. 358 if (signal_thread == NULL || signal_thread->osthread() == NULL) { 359 vm_exit_during_initialization("java.lang.OutOfMemoryError", 360 "unable to create new native thread"); 361 } 362 363 java_lang_Thread::set_thread(thread_oop(), signal_thread); 364 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 365 java_lang_Thread::set_daemon(thread_oop()); 366 367 signal_thread->set_threadObj(thread_oop()); 368 Threads::add(signal_thread); 369 Thread::start(signal_thread); 370 } 371 // Handle ^BREAK 372 os::signal(SIGBREAK, os::user_handler()); 373 } 374 } 375 376 377 void os::terminate_signal_thread() { 378 if (!ReduceSignalUsage) 379 signal_notify(sigexitnum_pd()); 380 } 381 382 383 // --------------------- loading libraries --------------------- 384 385 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); 386 extern struct JavaVM_ main_vm; 387 388 static void* _native_java_library = NULL; 389 390 void* os::native_java_library() { 391 if (_native_java_library == NULL) { 392 char buffer[JVM_MAXPATHLEN]; 393 char ebuf[1024]; 394 395 // Try to load verify dll first. In 1.3 java dll depends on it and is not 396 // always able to find it when the loading executable is outside the JDK. 397 // In order to keep working with 1.2 we ignore any loading errors. 398 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), 399 "verify")) { 400 dll_load(buffer, ebuf, sizeof(ebuf)); 401 } 402 403 // Load java dll 404 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), 405 "java")) { 406 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); 407 } 408 if (_native_java_library == NULL) { 409 vm_exit_during_initialization("Unable to load native library", ebuf); 410 } 411 412 #if defined(__OpenBSD__) 413 // Work-around OpenBSD's lack of $ORIGIN support by pre-loading libnet.so 414 // ignore errors 415 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), 416 "net")) { 417 dll_load(buffer, ebuf, sizeof(ebuf)); 418 } 419 #endif 420 } 421 static jboolean onLoaded = JNI_FALSE; 422 if (onLoaded) { 423 // We may have to wait to fire OnLoad until TLS is initialized. 424 if (ThreadLocalStorage::is_initialized()) { 425 // The JNI_OnLoad handling is normally done by method load in 426 // java.lang.ClassLoader$NativeLibrary, but the VM loads the base library 427 // explicitly so we have to check for JNI_OnLoad as well 428 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; 429 JNI_OnLoad_t JNI_OnLoad = CAST_TO_FN_PTR( 430 JNI_OnLoad_t, dll_lookup(_native_java_library, onLoadSymbols[0])); 431 if (JNI_OnLoad != NULL) { 432 JavaThread* thread = JavaThread::current(); 433 ThreadToNativeFromVM ttn(thread); 434 HandleMark hm(thread); 435 jint ver = (*JNI_OnLoad)(&main_vm, NULL); 436 onLoaded = JNI_TRUE; 437 if (!Threads::is_supported_jni_version_including_1_1(ver)) { 438 vm_exit_during_initialization("Unsupported JNI version"); 439 } 440 } 441 } 442 } 443 return _native_java_library; 444 } 445 446 /* 447 * Support for finding Agent_On(Un)Load/Attach_<lib_name> if it exists. 448 * If libName == NULL then just find normal Agent_On(Un)Load/Attach entry point 449 * If check_lib == true then we are looking for an 450 * Agent_OnLoad_libname or Agent_OnAttach_libname function to determine if 451 * this library is statically linked into the image. 452 */ 453 void* os::findAgentFunction(AgentLibrary *agentLib, bool checkLib, 454 const char *syms[], size_t symsLen) { 455 const char *name; 456 void *handle = agentLib->os_lib(); 457 void *entryName = NULL; 458 char *agentFunctionName; 459 size_t i; 460 461 // If checking then use the agent name otherwise test is_static_lib() to 462 // see how to process this lookup 463 name = ((checkLib || agentLib->is_static_lib()) ? agentLib->name() : NULL); 464 for (i = 0; i < symsLen; i++) { 465 agentFunctionName = buildAgentFunctionName(syms[i], name, agentLib->is_absolute_path()); 466 if (agentFunctionName == NULL) { 467 break; 468 } 469 entryName = dll_lookup(handle, agentFunctionName); 470 FREE_C_HEAP_ARRAY(char, agentFunctionName, mtThread); 471 if(entryName != NULL) { 472 break; 473 } 474 } 475 return entryName; 476 } 477 478 // See if the passed in agent is statically linked into the VM image. 479 bool os::findBuiltinAgent(AgentLibrary *agentLib, const char *syms[], 480 size_t symsLen) { 481 void *ret; 482 void *procHandle; 483 void * saveHandle; 484 const char *name = agentLib->name(); 485 486 if (name == NULL) { 487 return false; 488 } 489 procHandle = getDefaultProcessHandle(); 490 // Check for Agent_OnLoad/Attach_libname function 491 saveHandle = agentLib->os_lib(); 492 // We want to look in this process' symbol table. 493 agentLib->set_os_lib(procHandle); 494 ret = findAgentFunction(agentLib, true, syms, symsLen); 495 agentLib->set_os_lib(saveHandle); 496 if (ret != NULL) { 497 // Found an entry point like Agent_OnLoad_libname so we have a static agent 498 agentLib->set_os_lib(procHandle); 499 agentLib->set_valid(); 500 agentLib->set_static_lib(true); 501 return true; 502 } 503 return false; 504 } 505 506 // --------------------- heap allocation utilities --------------------- 507 508 char *os::strdup(const char *str, MEMFLAGS flags) { 509 size_t size = strlen(str); 510 char *dup_str = (char *)malloc(size + 1, flags); 511 if (dup_str == NULL) return NULL; 512 strcpy(dup_str, str); 513 return dup_str; 514 } 515 516 517 518 #ifdef ASSERT 519 #define space_before (MallocCushion + sizeof(double)) 520 #define space_after MallocCushion 521 #define size_addr_from_base(p) (size_t*)(p + space_before - sizeof(size_t)) 522 #define size_addr_from_obj(p) ((size_t*)p - 1) 523 // MallocCushion: size of extra cushion allocated around objects with +UseMallocOnly 524 // NB: cannot be debug variable, because these aren't set from the command line until 525 // *after* the first few allocs already happened 526 #define MallocCushion 16 527 #else 528 #define space_before 0 529 #define space_after 0 530 #define size_addr_from_base(p) should not use w/o ASSERT 531 #define size_addr_from_obj(p) should not use w/o ASSERT 532 #define MallocCushion 0 533 #endif 534 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ 535 536 #ifdef ASSERT 537 inline size_t get_size(void* obj) { 538 size_t size = *size_addr_from_obj(obj); 539 if (size < 0) { 540 fatal(err_msg("free: size field of object #" PTR_FORMAT " was overwritten (" 541 SIZE_FORMAT ")", obj, size)); 542 } 543 return size; 544 } 545 546 u_char* find_cushion_backwards(u_char* start) { 547 u_char* p = start; 548 while (p[ 0] != badResourceValue || p[-1] != badResourceValue || 549 p[-2] != badResourceValue || p[-3] != badResourceValue) p--; 550 // ok, we have four consecutive marker bytes; find start 551 u_char* q = p - 4; 552 while (*q == badResourceValue) q--; 553 return q + 1; 554 } 555 556 u_char* find_cushion_forwards(u_char* start) { 557 u_char* p = start; 558 while (p[0] != badResourceValue || p[1] != badResourceValue || 559 p[2] != badResourceValue || p[3] != badResourceValue) p++; 560 // ok, we have four consecutive marker bytes; find end of cushion 561 u_char* q = p + 4; 562 while (*q == badResourceValue) q++; 563 return q - MallocCushion; 564 } 565 566 void print_neighbor_blocks(void* ptr) { 567 // find block allocated before ptr (not entirely crash-proof) 568 if (MallocCushion < 4) { 569 tty->print_cr("### cannot find previous block (MallocCushion < 4)"); 570 return; 571 } 572 u_char* start_of_this_block = (u_char*)ptr - space_before; 573 u_char* end_of_prev_block_data = start_of_this_block - space_after -1; 574 // look for cushion in front of prev. block 575 u_char* start_of_prev_block = find_cushion_backwards(end_of_prev_block_data); 576 ptrdiff_t size = *size_addr_from_base(start_of_prev_block); 577 u_char* obj = start_of_prev_block + space_before; 578 if (size <= 0 ) { 579 // start is bad; mayhave been confused by OS data inbetween objects 580 // search one more backwards 581 start_of_prev_block = find_cushion_backwards(start_of_prev_block); 582 size = *size_addr_from_base(start_of_prev_block); 583 obj = start_of_prev_block + space_before; 584 } 585 586 if (start_of_prev_block + space_before + size + space_after == start_of_this_block) { 587 tty->print_cr("### previous object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); 588 } else { 589 tty->print_cr("### previous object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); 590 } 591 592 // now find successor block 593 u_char* start_of_next_block = (u_char*)ptr + *size_addr_from_obj(ptr) + space_after; 594 start_of_next_block = find_cushion_forwards(start_of_next_block); 595 u_char* next_obj = start_of_next_block + space_before; 596 ptrdiff_t next_size = *size_addr_from_base(start_of_next_block); 597 if (start_of_next_block[0] == badResourceValue && 598 start_of_next_block[1] == badResourceValue && 599 start_of_next_block[2] == badResourceValue && 600 start_of_next_block[3] == badResourceValue) { 601 tty->print_cr("### next object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); 602 } else { 603 tty->print_cr("### next object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); 604 } 605 } 606 607 608 void report_heap_error(void* memblock, void* bad, const char* where) { 609 tty->print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT, os::num_mallocs, os::num_frees); 610 tty->print_cr("## memory stomp: byte at " PTR_FORMAT " %s object " PTR_FORMAT, bad, where, memblock); 611 print_neighbor_blocks(memblock); 612 fatal("memory stomping error"); 613 } 614 615 void verify_block(void* memblock) { 616 size_t size = get_size(memblock); 617 if (MallocCushion) { 618 u_char* ptr = (u_char*)memblock - space_before; 619 for (int i = 0; i < MallocCushion; i++) { 620 if (ptr[i] != badResourceValue) { 621 report_heap_error(memblock, ptr+i, "in front of"); 622 } 623 } 624 u_char* end = (u_char*)memblock + size + space_after; 625 for (int j = -MallocCushion; j < 0; j++) { 626 if (end[j] != badResourceValue) { 627 report_heap_error(memblock, end+j, "after"); 628 } 629 } 630 } 631 } 632 #endif 633 634 // 635 // This function supports testing of the malloc out of memory 636 // condition without really running the system out of memory. 637 // 638 static u_char* testMalloc(size_t alloc_size) { 639 assert(MallocMaxTestWords > 0, "sanity check"); 640 641 if ((cur_malloc_words + (alloc_size / BytesPerWord)) > MallocMaxTestWords) { 642 return NULL; 643 } 644 645 u_char* ptr = (u_char*)::malloc(alloc_size); 646 647 if (ptr != NULL) { 648 Atomic::add(((jint) (alloc_size / BytesPerWord)), 649 (volatile jint *) &cur_malloc_words); 650 } 651 return ptr; 652 } 653 654 void* os::malloc(size_t size, MEMFLAGS memflags, address caller) { 655 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); 656 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); 657 658 if (size == 0) { 659 // return a valid pointer if size is zero 660 // if NULL is returned the calling functions assume out of memory. 661 size = 1; 662 } 663 664 const size_t alloc_size = size + space_before + space_after; 665 666 if (size > alloc_size) { // Check for rollover. 667 return NULL; 668 } 669 670 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); 671 672 u_char* ptr; 673 674 if (MallocMaxTestWords > 0) { 675 ptr = testMalloc(alloc_size); 676 } else { 677 ptr = (u_char*)::malloc(alloc_size); 678 } 679 680 #ifdef ASSERT 681 if (ptr == NULL) return NULL; 682 if (MallocCushion) { 683 for (u_char* p = ptr; p < ptr + MallocCushion; p++) *p = (u_char)badResourceValue; 684 u_char* end = ptr + space_before + size; 685 for (u_char* pq = ptr+MallocCushion; pq < end; pq++) *pq = (u_char)uninitBlockPad; 686 for (u_char* q = end; q < end + MallocCushion; q++) *q = (u_char)badResourceValue; 687 } 688 // put size just before data 689 *size_addr_from_base(ptr) = size; 690 #endif 691 u_char* memblock = ptr + space_before; 692 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { 693 tty->print_cr("os::malloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); 694 breakpoint(); 695 } 696 debug_only(if (paranoid) verify_block(memblock)); 697 if (PrintMalloc && tty != NULL) tty->print_cr("os::malloc " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); 698 699 // we do not track MallocCushion memory 700 MemTracker::record_malloc((address)memblock, size, memflags, caller == 0 ? CALLER_PC : caller); 701 702 return memblock; 703 } 704 705 706 void* os::realloc(void *memblock, size_t size, MEMFLAGS memflags, address caller) { 707 #ifndef ASSERT 708 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); 709 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); 710 MemTracker::Tracker tkr = MemTracker::get_realloc_tracker(); 711 void* ptr = ::realloc(memblock, size); 712 if (ptr != NULL) { 713 tkr.record((address)memblock, (address)ptr, size, memflags, 714 caller == 0 ? CALLER_PC : caller); 715 } else { 716 tkr.discard(); 717 } 718 return ptr; 719 #else 720 if (memblock == NULL) { 721 return malloc(size, memflags, (caller == 0 ? CALLER_PC : caller)); 722 } 723 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { 724 tty->print_cr("os::realloc caught " PTR_FORMAT, memblock); 725 breakpoint(); 726 } 727 verify_block(memblock); 728 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); 729 if (size == 0) return NULL; 730 // always move the block 731 void* ptr = malloc(size, memflags, caller == 0 ? CALLER_PC : caller); 732 if (PrintMalloc) tty->print_cr("os::remalloc " SIZE_FORMAT " bytes, " PTR_FORMAT " --> " PTR_FORMAT, size, memblock, ptr); 733 // Copy to new memory if malloc didn't fail 734 if ( ptr != NULL ) { 735 memcpy(ptr, memblock, MIN2(size, get_size(memblock))); 736 if (paranoid) verify_block(ptr); 737 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { 738 tty->print_cr("os::realloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); 739 breakpoint(); 740 } 741 free(memblock); 742 } 743 return ptr; 744 #endif 745 } 746 747 748 void os::free(void *memblock, MEMFLAGS memflags) { 749 NOT_PRODUCT(inc_stat_counter(&num_frees, 1)); 750 #ifdef ASSERT 751 if (memblock == NULL) return; 752 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { 753 if (tty != NULL) tty->print_cr("os::free caught " PTR_FORMAT, memblock); 754 breakpoint(); 755 } 756 verify_block(memblock); 757 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); 758 // Added by detlefs. 759 if (MallocCushion) { 760 u_char* ptr = (u_char*)memblock - space_before; 761 for (u_char* p = ptr; p < ptr + MallocCushion; p++) { 762 guarantee(*p == badResourceValue, 763 "Thing freed should be malloc result."); 764 *p = (u_char)freeBlockPad; 765 } 766 size_t size = get_size(memblock); 767 inc_stat_counter(&free_bytes, size); 768 u_char* end = ptr + space_before + size; 769 for (u_char* q = end; q < end + MallocCushion; q++) { 770 guarantee(*q == badResourceValue, 771 "Thing freed should be malloc result."); 772 *q = (u_char)freeBlockPad; 773 } 774 if (PrintMalloc && tty != NULL) 775 fprintf(stderr, "os::free " SIZE_FORMAT " bytes --> " PTR_FORMAT "\n", size, (uintptr_t)memblock); 776 } else if (PrintMalloc && tty != NULL) { 777 // tty->print_cr("os::free %p", memblock); 778 fprintf(stderr, "os::free " PTR_FORMAT "\n", (uintptr_t)memblock); 779 } 780 #endif 781 MemTracker::record_free((address)memblock, memflags); 782 783 ::free((char*)memblock - space_before); 784 } 785 786 void os::init_random(long initval) { 787 _rand_seed = initval; 788 } 789 790 791 long os::random() { 792 /* standard, well-known linear congruential random generator with 793 * next_rand = (16807*seed) mod (2**31-1) 794 * see 795 * (1) "Random Number Generators: Good Ones Are Hard to Find", 796 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), 797 * (2) "Two Fast Implementations of the 'Minimal Standard' Random 798 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. 799 */ 800 const long a = 16807; 801 const unsigned long m = 2147483647; 802 const long q = m / a; assert(q == 127773, "weird math"); 803 const long r = m % a; assert(r == 2836, "weird math"); 804 805 // compute az=2^31p+q 806 unsigned long lo = a * (long)(_rand_seed & 0xFFFF); 807 unsigned long hi = a * (long)((unsigned long)_rand_seed >> 16); 808 lo += (hi & 0x7FFF) << 16; 809 810 // if q overflowed, ignore the overflow and increment q 811 if (lo > m) { 812 lo &= m; 813 ++lo; 814 } 815 lo += hi >> 15; 816 817 // if (p+q) overflowed, ignore the overflow and increment (p+q) 818 if (lo > m) { 819 lo &= m; 820 ++lo; 821 } 822 return (_rand_seed = lo); 823 } 824 825 // The INITIALIZED state is distinguished from the SUSPENDED state because the 826 // conditions in which a thread is first started are different from those in which 827 // a suspension is resumed. These differences make it hard for us to apply the 828 // tougher checks when starting threads that we want to do when resuming them. 829 // However, when start_thread is called as a result of Thread.start, on a Java 830 // thread, the operation is synchronized on the Java Thread object. So there 831 // cannot be a race to start the thread and hence for the thread to exit while 832 // we are working on it. Non-Java threads that start Java threads either have 833 // to do so in a context in which races are impossible, or should do appropriate 834 // locking. 835 836 void os::start_thread(Thread* thread) { 837 // guard suspend/resume 838 MutexLockerEx ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); 839 OSThread* osthread = thread->osthread(); 840 osthread->set_state(RUNNABLE); 841 pd_start_thread(thread); 842 } 843 844 //--------------------------------------------------------------------------- 845 // Helper functions for fatal error handler 846 847 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { 848 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); 849 850 int cols = 0; 851 int cols_per_line = 0; 852 switch (unitsize) { 853 case 1: cols_per_line = 16; break; 854 case 2: cols_per_line = 8; break; 855 case 4: cols_per_line = 4; break; 856 case 8: cols_per_line = 2; break; 857 default: return; 858 } 859 860 address p = start; 861 st->print(PTR_FORMAT ": ", start); 862 while (p < end) { 863 switch (unitsize) { 864 case 1: st->print("%02x", *(u1*)p); break; 865 case 2: st->print("%04x", *(u2*)p); break; 866 case 4: st->print("%08x", *(u4*)p); break; 867 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; 868 } 869 p += unitsize; 870 cols++; 871 if (cols >= cols_per_line && p < end) { 872 cols = 0; 873 st->cr(); 874 st->print(PTR_FORMAT ": ", p); 875 } else { 876 st->print(" "); 877 } 878 } 879 st->cr(); 880 } 881 882 void os::print_environment_variables(outputStream* st, const char** env_list, 883 char* buffer, int len) { 884 if (env_list) { 885 st->print_cr("Environment Variables:"); 886 887 for (int i = 0; env_list[i] != NULL; i++) { 888 if (getenv(env_list[i], buffer, len)) { 889 st->print(env_list[i]); 890 st->print("="); 891 st->print_cr(buffer); 892 } 893 } 894 } 895 } 896 897 void os::print_cpu_info(outputStream* st) { 898 // cpu 899 st->print("CPU:"); 900 st->print("total %d", os::processor_count()); 901 // It's not safe to query number of active processors after crash 902 // st->print("(active %d)", os::active_processor_count()); 903 st->print(" %s", VM_Version::cpu_features()); 904 st->cr(); 905 pd_print_cpu_info(st); 906 } 907 908 void os::print_date_and_time(outputStream *st) { 909 time_t tloc; 910 (void)time(&tloc); 911 st->print("time: %s", ctime(&tloc)); // ctime adds newline. 912 913 double t = os::elapsedTime(); 914 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in 915 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int 916 // before printf. We lost some precision, but who cares? 917 st->print_cr("elapsed time: %d seconds", (int)t); 918 } 919 920 // moved from debug.cpp (used to be find()) but still called from there 921 // The verbose parameter is only set by the debug code in one case 922 void os::print_location(outputStream* st, intptr_t x, bool verbose) { 923 address addr = (address)x; 924 CodeBlob* b = CodeCache::find_blob_unsafe(addr); 925 if (b != NULL) { 926 if (b->is_buffer_blob()) { 927 // the interpreter is generated into a buffer blob 928 InterpreterCodelet* i = Interpreter::codelet_containing(addr); 929 if (i != NULL) { 930 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an Interpreter codelet", addr, (int)(addr - i->code_begin())); 931 i->print_on(st); 932 return; 933 } 934 if (Interpreter::contains(addr)) { 935 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code" 936 " (not bytecode specific)", addr); 937 return; 938 } 939 // 940 if (AdapterHandlerLibrary::contains(b)) { 941 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an AdapterHandler", addr, (int)(addr - b->code_begin())); 942 AdapterHandlerLibrary::print_handler_on(st, b); 943 } 944 // the stubroutines are generated into a buffer blob 945 StubCodeDesc* d = StubCodeDesc::desc_for(addr); 946 if (d != NULL) { 947 st->print_cr(INTPTR_FORMAT " is at begin+%d in a stub", addr, (int)(addr - d->begin())); 948 d->print_on(st); 949 st->cr(); 950 return; 951 } 952 if (StubRoutines::contains(addr)) { 953 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) " 954 "stub routine", addr); 955 return; 956 } 957 // the InlineCacheBuffer is using stubs generated into a buffer blob 958 if (InlineCacheBuffer::contains(addr)) { 959 st->print_cr(INTPTR_FORMAT " is pointing into InlineCacheBuffer", addr); 960 return; 961 } 962 VtableStub* v = VtableStubs::stub_containing(addr); 963 if (v != NULL) { 964 st->print_cr(INTPTR_FORMAT " is at entry_point+%d in a vtable stub", addr, (int)(addr - v->entry_point())); 965 v->print_on(st); 966 st->cr(); 967 return; 968 } 969 } 970 nmethod* nm = b->as_nmethod_or_null(); 971 if (nm != NULL) { 972 ResourceMark rm; 973 st->print(INTPTR_FORMAT " is at entry_point+%d in (nmethod*)" INTPTR_FORMAT, 974 addr, (int)(addr - nm->entry_point()), nm); 975 if (verbose) { 976 st->print(" for "); 977 nm->method()->print_value_on(st); 978 } 979 st->cr(); 980 nm->print_nmethod(verbose); 981 return; 982 } 983 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in ", addr, (int)(addr - b->code_begin())); 984 b->print_on(st); 985 return; 986 } 987 988 if (Universe::heap()->is_in(addr)) { 989 HeapWord* p = Universe::heap()->block_start(addr); 990 bool print = false; 991 // If we couldn't find it it just may mean that heap wasn't parseable 992 // See if we were just given an oop directly 993 if (p != NULL && Universe::heap()->block_is_obj(p)) { 994 print = true; 995 } else if (p == NULL && ((oopDesc*)addr)->is_oop()) { 996 p = (HeapWord*) addr; 997 print = true; 998 } 999 if (print) { 1000 if (p == (HeapWord*) addr) { 1001 st->print_cr(INTPTR_FORMAT " is an oop", addr); 1002 } else { 1003 st->print_cr(INTPTR_FORMAT " is pointing into object: " INTPTR_FORMAT, addr, p); 1004 } 1005 oop(p)->print_on(st); 1006 return; 1007 } 1008 } else { 1009 if (Universe::heap()->is_in_reserved(addr)) { 1010 st->print_cr(INTPTR_FORMAT " is an unallocated location " 1011 "in the heap", addr); 1012 return; 1013 } 1014 } 1015 if (JNIHandles::is_global_handle((jobject) addr)) { 1016 st->print_cr(INTPTR_FORMAT " is a global jni handle", addr); 1017 return; 1018 } 1019 if (JNIHandles::is_weak_global_handle((jobject) addr)) { 1020 st->print_cr(INTPTR_FORMAT " is a weak global jni handle", addr); 1021 return; 1022 } 1023 #ifndef PRODUCT 1024 // we don't keep the block list in product mode 1025 if (JNIHandleBlock::any_contains((jobject) addr)) { 1026 st->print_cr(INTPTR_FORMAT " is a local jni handle", addr); 1027 return; 1028 } 1029 #endif 1030 1031 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { 1032 // Check for privilege stack 1033 if (thread->privileged_stack_top() != NULL && 1034 thread->privileged_stack_top()->contains(addr)) { 1035 st->print_cr(INTPTR_FORMAT " is pointing into the privilege stack " 1036 "for thread: " INTPTR_FORMAT, addr, thread); 1037 if (verbose) thread->print_on(st); 1038 return; 1039 } 1040 // If the addr is a java thread print information about that. 1041 if (addr == (address)thread) { 1042 if (verbose) { 1043 thread->print_on(st); 1044 } else { 1045 st->print_cr(INTPTR_FORMAT " is a thread", addr); 1046 } 1047 return; 1048 } 1049 // If the addr is in the stack region for this thread then report that 1050 // and print thread info 1051 if (thread->stack_base() >= addr && 1052 addr > (thread->stack_base() - thread->stack_size())) { 1053 st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " 1054 INTPTR_FORMAT, addr, thread); 1055 if (verbose) thread->print_on(st); 1056 return; 1057 } 1058 1059 } 1060 1061 #ifndef PRODUCT 1062 // Check if in metaspace. 1063 if (ClassLoaderDataGraph::contains((address)addr)) { 1064 // Use addr->print() from the debugger instead (not here) 1065 st->print_cr(INTPTR_FORMAT 1066 " is pointing into metadata", addr); 1067 return; 1068 } 1069 #endif 1070 1071 // Try an OS specific find 1072 if (os::find(addr, st)) { 1073 return; 1074 } 1075 1076 st->print_cr(INTPTR_FORMAT " is an unknown value", addr); 1077 } 1078 1079 // Looks like all platforms except IA64 can use the same function to check 1080 // if C stack is walkable beyond current frame. The check for fp() is not 1081 // necessary on Sparc, but it's harmless. 1082 bool os::is_first_C_frame(frame* fr) { 1083 #if defined(IA64) && !defined(_WIN32) 1084 // On IA64 we have to check if the callers bsp is still valid 1085 // (i.e. within the register stack bounds). 1086 // Notice: this only works for threads created by the VM and only if 1087 // we walk the current stack!!! If we want to be able to walk 1088 // arbitrary other threads, we'll have to somehow store the thread 1089 // object in the frame. 1090 Thread *thread = Thread::current(); 1091 if ((address)fr->fp() <= 1092 thread->register_stack_base() HPUX_ONLY(+ 0x0) LINUX_ONLY(+ 0x50)) { 1093 // This check is a little hacky, because on Linux the first C 1094 // frame's ('start_thread') register stack frame starts at 1095 // "register_stack_base + 0x48" while on HPUX, the first C frame's 1096 // ('__pthread_bound_body') register stack frame seems to really 1097 // start at "register_stack_base". 1098 return true; 1099 } else { 1100 return false; 1101 } 1102 #elif defined(IA64) && defined(_WIN32) 1103 return true; 1104 #else 1105 // Load up sp, fp, sender sp and sender fp, check for reasonable values. 1106 // Check usp first, because if that's bad the other accessors may fault 1107 // on some architectures. Ditto ufp second, etc. 1108 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); 1109 // sp on amd can be 32 bit aligned. 1110 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); 1111 1112 uintptr_t usp = (uintptr_t)fr->sp(); 1113 if ((usp & sp_align_mask) != 0) return true; 1114 1115 uintptr_t ufp = (uintptr_t)fr->fp(); 1116 if ((ufp & fp_align_mask) != 0) return true; 1117 1118 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); 1119 if ((old_sp & sp_align_mask) != 0) return true; 1120 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; 1121 1122 uintptr_t old_fp = (uintptr_t)fr->link(); 1123 if ((old_fp & fp_align_mask) != 0) return true; 1124 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; 1125 1126 // stack grows downwards; if old_fp is below current fp or if the stack 1127 // frame is too large, either the stack is corrupted or fp is not saved 1128 // on stack (i.e. on x86, ebp may be used as general register). The stack 1129 // is not walkable beyond current frame. 1130 if (old_fp < ufp) return true; 1131 if (old_fp - ufp > 64 * K) return true; 1132 1133 return false; 1134 #endif 1135 } 1136 1137 #ifdef ASSERT 1138 extern "C" void test_random() { 1139 const double m = 2147483647; 1140 double mean = 0.0, variance = 0.0, t; 1141 long reps = 10000; 1142 unsigned long seed = 1; 1143 1144 tty->print_cr("seed %ld for %ld repeats...", seed, reps); 1145 os::init_random(seed); 1146 long num; 1147 for (int k = 0; k < reps; k++) { 1148 num = os::random(); 1149 double u = (double)num / m; 1150 assert(u >= 0.0 && u <= 1.0, "bad random number!"); 1151 1152 // calculate mean and variance of the random sequence 1153 mean += u; 1154 variance += (u*u); 1155 } 1156 mean /= reps; 1157 variance /= (reps - 1); 1158 1159 assert(num == 1043618065, "bad seed"); 1160 tty->print_cr("mean of the 1st 10000 numbers: %f", mean); 1161 tty->print_cr("variance of the 1st 10000 numbers: %f", variance); 1162 const double eps = 0.0001; 1163 t = fabsd(mean - 0.5018); 1164 assert(t < eps, "bad mean"); 1165 t = (variance - 0.3355) < 0.0 ? -(variance - 0.3355) : variance - 0.3355; 1166 assert(t < eps, "bad variance"); 1167 } 1168 #endif 1169 1170 1171 // Set up the boot classpath. 1172 1173 char* os::format_boot_path(const char* format_string, 1174 const char* home, 1175 int home_len, 1176 char fileSep, 1177 char pathSep) { 1178 assert((fileSep == '/' && pathSep == ':') || 1179 (fileSep == '\\' && pathSep == ';'), "unexpected seperator chars"); 1180 1181 // Scan the format string to determine the length of the actual 1182 // boot classpath, and handle platform dependencies as well. 1183 int formatted_path_len = 0; 1184 const char* p; 1185 for (p = format_string; *p != 0; ++p) { 1186 if (*p == '%') formatted_path_len += home_len - 1; 1187 ++formatted_path_len; 1188 } 1189 1190 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1, mtInternal); 1191 if (formatted_path == NULL) { 1192 return NULL; 1193 } 1194 1195 // Create boot classpath from format, substituting separator chars and 1196 // java home directory. 1197 char* q = formatted_path; 1198 for (p = format_string; *p != 0; ++p) { 1199 switch (*p) { 1200 case '%': 1201 strcpy(q, home); 1202 q += home_len; 1203 break; 1204 case '/': 1205 *q++ = fileSep; 1206 break; 1207 case ':': 1208 *q++ = pathSep; 1209 break; 1210 default: 1211 *q++ = *p; 1212 } 1213 } 1214 *q = '\0'; 1215 1216 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); 1217 return formatted_path; 1218 } 1219 1220 1221 bool os::set_boot_path(char fileSep, char pathSep) { 1222 const char* home = Arguments::get_java_home(); 1223 int home_len = (int)strlen(home); 1224 1225 static const char* meta_index_dir_format = "%/lib/"; 1226 static const char* meta_index_format = "%/lib/meta-index"; 1227 char* meta_index = format_boot_path(meta_index_format, home, home_len, fileSep, pathSep); 1228 if (meta_index == NULL) return false; 1229 char* meta_index_dir = format_boot_path(meta_index_dir_format, home, home_len, fileSep, pathSep); 1230 if (meta_index_dir == NULL) return false; 1231 Arguments::set_meta_index_path(meta_index, meta_index_dir); 1232 1233 // Any modification to the JAR-file list, for the boot classpath must be 1234 // aligned with install/install/make/common/Pack.gmk. Note: boot class 1235 // path class JARs, are stripped for StackMapTable to reduce download size. 1236 static const char classpath_format[] = 1237 "%/lib/resources.jar:" 1238 "%/lib/rt.jar:" 1239 "%/lib/sunrsasign.jar:" 1240 "%/lib/jsse.jar:" 1241 "%/lib/jce.jar:" 1242 "%/lib/charsets.jar:" 1243 "%/lib/jfr.jar:" 1244 #ifdef __APPLE__ 1245 "%/lib/JObjC.jar:" 1246 #endif 1247 "%/classes"; 1248 char* sysclasspath = format_boot_path(classpath_format, home, home_len, fileSep, pathSep); 1249 if (sysclasspath == NULL) return false; 1250 Arguments::set_sysclasspath(sysclasspath); 1251 1252 return true; 1253 } 1254 1255 /* 1256 * Splits a path, based on its separator, the number of 1257 * elements is returned back in n. 1258 * It is the callers responsibility to: 1259 * a> check the value of n, and n may be 0. 1260 * b> ignore any empty path elements 1261 * c> free up the data. 1262 */ 1263 char** os::split_path(const char* path, int* n) { 1264 *n = 0; 1265 if (path == NULL || strlen(path) == 0) { 1266 return NULL; 1267 } 1268 const char psepchar = *os::path_separator(); 1269 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1, mtInternal); 1270 if (inpath == NULL) { 1271 return NULL; 1272 } 1273 strcpy(inpath, path); 1274 int count = 1; 1275 char* p = strchr(inpath, psepchar); 1276 // Get a count of elements to allocate memory 1277 while (p != NULL) { 1278 count++; 1279 p++; 1280 p = strchr(p, psepchar); 1281 } 1282 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count, mtInternal); 1283 if (opath == NULL) { 1284 return NULL; 1285 } 1286 1287 // do the actual splitting 1288 p = inpath; 1289 for (int i = 0 ; i < count ; i++) { 1290 size_t len = strcspn(p, os::path_separator()); 1291 if (len > JVM_MAXPATHLEN) { 1292 return NULL; 1293 } 1294 // allocate the string and add terminator storage 1295 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 1296 if (s == NULL) { 1297 return NULL; 1298 } 1299 strncpy(s, p, len); 1300 s[len] = '\0'; 1301 opath[i] = s; 1302 p += len + 1; 1303 } 1304 FREE_C_HEAP_ARRAY(char, inpath, mtInternal); 1305 *n = count; 1306 return opath; 1307 } 1308 1309 void os::set_memory_serialize_page(address page) { 1310 int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); 1311 _mem_serialize_page = (volatile int32_t *)page; 1312 // We initialize the serialization page shift count here 1313 // We assume a cache line size of 64 bytes 1314 assert(SerializePageShiftCount == count, 1315 "thread size changed, fix SerializePageShiftCount constant"); 1316 set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t))); 1317 } 1318 1319 static volatile intptr_t SerializePageLock = 0; 1320 1321 // This method is called from signal handler when SIGSEGV occurs while the current 1322 // thread tries to store to the "read-only" memory serialize page during state 1323 // transition. 1324 void os::block_on_serialize_page_trap() { 1325 if (TraceSafepoint) { 1326 tty->print_cr("Block until the serialize page permission restored"); 1327 } 1328 // When VMThread is holding the SerializePageLock during modifying the 1329 // access permission of the memory serialize page, the following call 1330 // will block until the permission of that page is restored to rw. 1331 // Generally, it is unsafe to manipulate locks in signal handlers, but in 1332 // this case, it's OK as the signal is synchronous and we know precisely when 1333 // it can occur. 1334 Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page"); 1335 Thread::muxRelease(&SerializePageLock); 1336 } 1337 1338 // Serialize all thread state variables 1339 void os::serialize_thread_states() { 1340 // On some platforms such as Solaris & Linux, the time duration of the page 1341 // permission restoration is observed to be much longer than expected due to 1342 // scheduler starvation problem etc. To avoid the long synchronization 1343 // time and expensive page trap spinning, 'SerializePageLock' is used to block 1344 // the mutator thread if such case is encountered. See bug 6546278 for details. 1345 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); 1346 os::protect_memory((char *)os::get_memory_serialize_page(), 1347 os::vm_page_size(), MEM_PROT_READ); 1348 os::protect_memory((char *)os::get_memory_serialize_page(), 1349 os::vm_page_size(), MEM_PROT_RW); 1350 Thread::muxRelease(&SerializePageLock); 1351 } 1352 1353 // Returns true if the current stack pointer is above the stack shadow 1354 // pages, false otherwise. 1355 1356 bool os::stack_shadow_pages_available(Thread *thread, methodHandle method) { 1357 assert(StackRedPages > 0 && StackYellowPages > 0,"Sanity check"); 1358 address sp = current_stack_pointer(); 1359 // Check if we have StackShadowPages above the yellow zone. This parameter 1360 // is dependent on the depth of the maximum VM call stack possible from 1361 // the handler for stack overflow. 'instanceof' in the stack overflow 1362 // handler or a println uses at least 8k stack of VM and native code 1363 // respectively. 1364 const int framesize_in_bytes = 1365 Interpreter::size_top_interpreter_activation(method()) * wordSize; 1366 int reserved_area = ((StackShadowPages + StackRedPages + StackYellowPages) 1367 * vm_page_size()) + framesize_in_bytes; 1368 // The very lower end of the stack 1369 address stack_limit = thread->stack_base() - thread->stack_size(); 1370 return (sp > (stack_limit + reserved_area)); 1371 } 1372 1373 size_t os::page_size_for_region(size_t region_min_size, size_t region_max_size, 1374 uint min_pages) 1375 { 1376 assert(min_pages > 0, "sanity"); 1377 if (UseLargePages) { 1378 const size_t max_page_size = region_max_size / min_pages; 1379 1380 for (unsigned int i = 0; _page_sizes[i] != 0; ++i) { 1381 const size_t sz = _page_sizes[i]; 1382 const size_t mask = sz - 1; 1383 if ((region_min_size & mask) == 0 && (region_max_size & mask) == 0) { 1384 // The largest page size with no fragmentation. 1385 return sz; 1386 } 1387 1388 if (sz <= max_page_size) { 1389 // The largest page size that satisfies the min_pages requirement. 1390 return sz; 1391 } 1392 } 1393 } 1394 1395 return vm_page_size(); 1396 } 1397 1398 #ifndef PRODUCT 1399 void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count) 1400 { 1401 if (TracePageSizes) { 1402 tty->print("%s: ", str); 1403 for (int i = 0; i < count; ++i) { 1404 tty->print(" " SIZE_FORMAT, page_sizes[i]); 1405 } 1406 tty->cr(); 1407 } 1408 } 1409 1410 void os::trace_page_sizes(const char* str, const size_t region_min_size, 1411 const size_t region_max_size, const size_t page_size, 1412 const char* base, const size_t size) 1413 { 1414 if (TracePageSizes) { 1415 tty->print_cr("%s: min=" SIZE_FORMAT " max=" SIZE_FORMAT 1416 " pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT 1417 " size=" SIZE_FORMAT, 1418 str, region_min_size, region_max_size, 1419 page_size, base, size); 1420 } 1421 } 1422 #endif // #ifndef PRODUCT 1423 1424 // This is the working definition of a server class machine: 1425 // >= 2 physical CPU's and >=2GB of memory, with some fuzz 1426 // because the graphics memory (?) sometimes masks physical memory. 1427 // If you want to change the definition of a server class machine 1428 // on some OS or platform, e.g., >=4GB on Windohs platforms, 1429 // then you'll have to parameterize this method based on that state, 1430 // as was done for logical processors here, or replicate and 1431 // specialize this method for each platform. (Or fix os to have 1432 // some inheritance structure and use subclassing. Sigh.) 1433 // If you want some platform to always or never behave as a server 1434 // class machine, change the setting of AlwaysActAsServerClassMachine 1435 // and NeverActAsServerClassMachine in globals*.hpp. 1436 bool os::is_server_class_machine() { 1437 // First check for the early returns 1438 if (NeverActAsServerClassMachine) { 1439 return false; 1440 } 1441 if (AlwaysActAsServerClassMachine) { 1442 return true; 1443 } 1444 // Then actually look at the machine 1445 bool result = false; 1446 const unsigned int server_processors = 2; 1447 const julong server_memory = 2UL * G; 1448 // We seem not to get our full complement of memory. 1449 // We allow some part (1/8?) of the memory to be "missing", 1450 // based on the sizes of DIMMs, and maybe graphics cards. 1451 const julong missing_memory = 256UL * M; 1452 1453 /* Is this a server class machine? */ 1454 if ((os::active_processor_count() >= (int)server_processors) && 1455 (os::physical_memory() >= (server_memory - missing_memory))) { 1456 const unsigned int logical_processors = 1457 VM_Version::logical_processors_per_package(); 1458 if (logical_processors > 1) { 1459 const unsigned int physical_packages = 1460 os::active_processor_count() / logical_processors; 1461 if (physical_packages > server_processors) { 1462 result = true; 1463 } 1464 } else { 1465 result = true; 1466 } 1467 } 1468 return result; 1469 } 1470 1471 // Read file line by line, if line is longer than bsize, 1472 // skip rest of line. 1473 int os::get_line_chars(int fd, char* buf, const size_t bsize){ 1474 size_t sz, i = 0; 1475 1476 // read until EOF, EOL or buf is full 1477 while ((sz = (int) read(fd, &buf[i], 1)) == 1 && i < (bsize-2) && buf[i] != '\n') { 1478 ++i; 1479 } 1480 1481 if (buf[i] == '\n') { 1482 // EOL reached so ignore EOL character and return 1483 1484 buf[i] = 0; 1485 return (int) i; 1486 } 1487 1488 buf[i+1] = 0; 1489 1490 if (sz != 1) { 1491 // EOF reached. if we read chars before EOF return them and 1492 // return EOF on next call otherwise return EOF 1493 1494 return (i == 0) ? -1 : (int) i; 1495 } 1496 1497 // line is longer than size of buf, skip to EOL 1498 char ch; 1499 while (read(fd, &ch, 1) == 1 && ch != '\n') { 1500 // Do nothing 1501 } 1502 1503 // return initial part of line that fits in buf. 1504 // If we reached EOF, it will be returned on next call. 1505 1506 return (int) i; 1507 } 1508 1509 void os::SuspendedThreadTask::run() { 1510 assert(Threads_lock->owned_by_self() || (_thread == VMThread::vm_thread()), "must have threads lock to call this"); 1511 internal_do_task(); 1512 _done = true; 1513 } 1514 1515 bool os::create_stack_guard_pages(char* addr, size_t bytes) { 1516 return os::pd_create_stack_guard_pages(addr, bytes); 1517 } 1518 1519 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 1520 char* result = pd_reserve_memory(bytes, addr, alignment_hint); 1521 if (result != NULL) { 1522 MemTracker::record_virtual_memory_reserve((address)result, bytes, mtNone, CALLER_PC); 1523 } 1524 1525 return result; 1526 } 1527 1528 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint, 1529 MEMFLAGS flags) { 1530 char* result = pd_reserve_memory(bytes, addr, alignment_hint); 1531 if (result != NULL) { 1532 MemTracker::record_virtual_memory_reserve((address)result, bytes, mtNone, CALLER_PC); 1533 MemTracker::record_virtual_memory_type((address)result, flags); 1534 } 1535 1536 return result; 1537 } 1538 1539 char* os::attempt_reserve_memory_at(size_t bytes, char* addr) { 1540 char* result = pd_attempt_reserve_memory_at(bytes, addr); 1541 if (result != NULL) { 1542 MemTracker::record_virtual_memory_reserve((address)result, bytes, mtNone, CALLER_PC); 1543 } 1544 return result; 1545 } 1546 1547 void os::split_reserved_memory(char *base, size_t size, 1548 size_t split, bool realloc) { 1549 pd_split_reserved_memory(base, size, split, realloc); 1550 } 1551 1552 bool os::commit_memory(char* addr, size_t bytes, bool executable) { 1553 bool res = pd_commit_memory(addr, bytes, executable); 1554 if (res) { 1555 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); 1556 } 1557 return res; 1558 } 1559 1560 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, 1561 bool executable) { 1562 bool res = os::pd_commit_memory(addr, size, alignment_hint, executable); 1563 if (res) { 1564 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); 1565 } 1566 return res; 1567 } 1568 1569 void os::commit_memory_or_exit(char* addr, size_t bytes, bool executable, 1570 const char* mesg) { 1571 pd_commit_memory_or_exit(addr, bytes, executable, mesg); 1572 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); 1573 } 1574 1575 void os::commit_memory_or_exit(char* addr, size_t size, size_t alignment_hint, 1576 bool executable, const char* mesg) { 1577 os::pd_commit_memory_or_exit(addr, size, alignment_hint, executable, mesg); 1578 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); 1579 } 1580 1581 bool os::uncommit_memory(char* addr, size_t bytes) { 1582 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_uncommit_tracker(); 1583 bool res = pd_uncommit_memory(addr, bytes); 1584 if (res) { 1585 tkr.record((address)addr, bytes); 1586 } else { 1587 tkr.discard(); 1588 } 1589 return res; 1590 } 1591 1592 bool os::release_memory(char* addr, size_t bytes) { 1593 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 1594 bool res = pd_release_memory(addr, bytes); 1595 if (res) { 1596 tkr.record((address)addr, bytes); 1597 } else { 1598 tkr.discard(); 1599 } 1600 return res; 1601 } 1602 1603 1604 char* os::map_memory(int fd, const char* file_name, size_t file_offset, 1605 char *addr, size_t bytes, bool read_only, 1606 bool allow_exec) { 1607 char* result = pd_map_memory(fd, file_name, file_offset, addr, bytes, read_only, allow_exec); 1608 if (result != NULL) { 1609 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, mtNone, CALLER_PC); 1610 } 1611 return result; 1612 } 1613 1614 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 1615 char *addr, size_t bytes, bool read_only, 1616 bool allow_exec) { 1617 return pd_remap_memory(fd, file_name, file_offset, addr, bytes, 1618 read_only, allow_exec); 1619 } 1620 1621 bool os::unmap_memory(char *addr, size_t bytes) { 1622 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); 1623 bool result = pd_unmap_memory(addr, bytes); 1624 if (result) { 1625 tkr.record((address)addr, bytes); 1626 } else { 1627 tkr.discard(); 1628 } 1629 return result; 1630 } 1631 1632 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { 1633 pd_free_memory(addr, bytes, alignment_hint); 1634 } 1635 1636 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 1637 pd_realign_memory(addr, bytes, alignment_hint); 1638 } 1639 1640 #ifndef TARGET_OS_FAMILY_windows 1641 /* try to switch state from state "from" to state "to" 1642 * returns the state set after the method is complete 1643 */ 1644 os::SuspendResume::State os::SuspendResume::switch_state(os::SuspendResume::State from, 1645 os::SuspendResume::State to) 1646 { 1647 os::SuspendResume::State result = 1648 (os::SuspendResume::State) Atomic::cmpxchg((jint) to, (jint *) &_state, (jint) from); 1649 if (result == from) { 1650 // success 1651 return to; 1652 } 1653 return result; 1654 } 1655 #endif