| products/Sources/formale Sprachen/JAVA/openjdk-20-36_src/src/hotspot/share/runtime/ |
|
Quellcode-Bibliothek© Kompilation durch diese Firma[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]Datei: tomcat-i18n-ru.pom Sprache: C |
|
||||||
|
/*
* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/javaClasses.hpp" #include "classfile/moduleEntry.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/vmClasses.hpp" #include "classfile/vmSymbols.hpp" #include "code/codeCache.hpp" #include "code/icBuffer.hpp" #include "code/vtableStubs.hpp" #include "gc/shared/gcVMOperations.hpp" #include "interpreter/interpreter.hpp" #include "jvm.h" #include "logging/log.hpp" #include "logging/logStream.hpp" #include "memory/allocation.inline.hpp" #include "memory/resourceArea.hpp" #include "memory/universe.hpp" #include "oops/compressedOops.inline.hpp" #include "oops/oop.inline.hpp" #include "prims/jvm_misc.hpp" #include "runtime/arguments.hpp" #include "runtime/atomic.hpp" #include "runtime/frame.inline.hpp" #include "runtime/handles.inline.hpp" #include "runtime/interfaceSupport.inline.hpp" #include "runtime/java.hpp" #include "runtime/javaCalls.hpp" #include "runtime/javaThread.hpp" #include "runtime/jniHandles.hpp" #include "runtime/mutexLocker.hpp" #include "runtime/os.inline.hpp" #include "runtime/osThread.hpp" #include "runtime/safefetch.hpp" #include "runtime/sharedRuntime.hpp" #include "runtime/threadCrashProtection.hpp" #include "runtime/threadSMR.hpp" #include "runtime/vmOperations.hpp" #include "runtime/vm_version.hpp" #include "services/attachListener.hpp" #include "services/mallocTracker.hpp" #include "services/mallocHeader.inline.hpp" #include "services/memTracker.hpp" #include "services/nmtPreInit.hpp" #include "services/nmtCommon.hpp" #include "services/threadService.hpp" #include "utilities/align.hpp" #include "utilities/count_trailing_zeros.hpp" #include "utilities/defaultStream.hpp" #include "utilities/events.hpp" #include "utilities/powerOfTwo.hpp" #ifndef _WINDOWS # include <poll.h> #endif # include <signal.h> # include <errno.h> OSThread* os::_starting_thread = NULL; address os::_polling_page = NULL; volatile unsigned int os::_rand_seed = 1234567; int os::_processor_count = 0; int os::_initial_active_processor_count = 0; os::PageSizes os::_page_sizes; static size_t cur_malloc_words = 0; // current size for MallocMaxTestWords DEBUG_ONLY(bool os::_mutex_init_done = false;) int os::snprintf(char* buf, size_t len, const char* fmt, ...) { va_list args; va_start(args, fmt); int result = os::vsnprintf(buf, len, fmt, args); va_end(args); return result; } // Fill in buffer with current local time as an ISO-8601 string. // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. // Returns buffer, or NULL if it failed. char* os::iso8601_time(char* buffer, size_t buffer_length, bool utc) { const jlong now = javaTimeMillis(); return os::iso8601_time(now, buffer, buffer_length, utc); } // Fill in buffer with an ISO-8601 string corresponding to the given javaTimeMillis value // E.g., yyyy-mm-ddThh:mm:ss-zzzz. // Returns buffer, or NULL if it failed. // This would mostly be a call to // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) // except that on Windows the %z behaves badly, so we do it ourselves. // Also, people wanted milliseconds on there, // and strftime doesn't do milliseconds. char* os::iso8601_time(jlong milliseconds_since_19700101, char* buffer, size_t buffer_ // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" // Sanity check the arguments if (buffer == NULL) { assert(false, "NULL buffer"); return NULL; } if (buffer_length < os::iso8601_timestamp_size) { assert(false, "buffer_length too small"); return NULL; } const int milliseconds_per_microsecond = 1000; const time_t seconds_since_19700101 = milliseconds_since_19700101 / milliseconds_per_microsecond; const int milliseconds_after_second = milliseconds_since_19700101 % milliseconds_per_microsecond; // Convert the time value to a tm and timezone variable struct tm time_struct; if (utc) { if (gmtime_pd(&seconds_since_19700101, &time_struct) == NULL) { assert(false, "Failed gmtime_pd"); return NULL; } } else { if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { assert(false, "Failed localtime_pd"); return NULL; } } const time_t seconds_per_minute = 60; const time_t minutes_per_hour = 60; const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; // No offset when dealing with UTC time_t UTC_to_local = 0; if (!utc) { #if defined(_ALLBSD_SOURCE) || defined(_GNU_SOURCE) UTC_to_local = -(time_struct.tm_gmtoff); #elif defined(_WINDOWS) long zone; _get_timezone(&zone); UTC_to_local = static_cast<time_t>(zone); #else UTC_to_local = timezone; #endif // tm_gmtoff already includes adjustment for daylight saving #if !defined(_ALLBSD_SOURCE) && !defined(_GNU_SOURCE) // If daylight savings time is in effect, // we are 1 hour East of our time zone if (time_struct.tm_isdst > 0) { UTC_to_local = UTC_to_local - seconds_per_hour; } #endif } // Compute the time zone offset. // localtime_pd() sets timezone to the difference (in seconds) // between UTC and local time. // ISO 8601 says we need the difference between local time and UTC, // we change the sign of the localtime_pd() result. const time_t local_to_UTC = -(UTC_to_local); // Then we have to figure out if if we are ahead (+) or behind (-) UTC. char sign_local_to_UTC = '+'; time_t abs_local_to_UTC = local_to_UTC; if (local_to_UTC < 0) { sign_local_to_UTC = '-'; abs_local_to_UTC = -(abs_local_to_UTC); } // Convert time zone offset seconds to hours and minutes. const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); const time_t zone_min = ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); // Print an ISO 8601 date and time stamp into the buffer const int year = 1900 + time_struct.tm_year; const int month = 1 + time_struct.tm_mon; const int printed = jio_snprintf(buffer, buffer_length, "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d", year, month, time_struct.tm_mday, time_struct.tm_hour, time_struct.tm_min, time_struct.tm_sec, milliseconds_after_second, sign_local_to_UTC, zone_hours, zone_min); if (printed == 0) { assert(false, "Failed jio_printf"); return NULL; } return buffer; } OSReturn os::set_priority(Thread* thread, ThreadPriority p) { debug_only(Thread::check_for_dangling_thread_pointer(thread);) if ((p >= MinPriority && p <= MaxPriority) || (p == CriticalPriority && thread->is_ConcurrentGC_thread())) { int priority = java_to_os_priority[p]; return set_native_priority(thread, priority); } else { assert(false, "Should not happen"); return OS_ERR; } } // The mapping from OS priority back to Java priority may be inexact because // Java priorities can map M:1 with native priorities. If you want the definite // Java priority then use JavaThread::java_priority() OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { int p; int os_prio; OSReturn ret = get_native_priority(thread, &os_prio); if (ret != OS_OK) return ret; if (java_to_os_priority[MaxPriority] > java_to_os_priority[MinPriority]) { for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; } else { // niceness values are in reverse order for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] < os_prio; p--) ; } priority = (ThreadPriority)p; return OS_OK; } bool os::dll_build_name(char* buffer, size_t size, const char* fname) { int n = jio_snprintf(buffer, size, "%s%s%s", JNI_LIB_PREFIX, fname, JNI_LIB_SUFFIX); return (n != -1); } #if !defined(LINUX) && !defined(_WINDOWS) bool os::committed_in_range(address start, size_t size, address& committed_start, s committed_start = start; committed_size = size; return true; } #endif // Helper for dll_locate_lib. // Pass buffer and printbuffer as we already printed the path to buffer // when we called get_current_directory. This way we avoid another buffer // of size MAX_PATH. static bool conc_path_file_and_check(char *buffer, char *printbuffer, size_t printbufle const char* pname, char lastchar, const char* fname) { // Concatenate path and file name, but don't print double path separators. const char *filesep = (WINDOWS_ONLY(lastchar == ':' ||) lastchar == os::file_separator()[0 "" : os::file_separator(); int ret = jio_snprintf(printbuffer, printbuflen, "%s%s%s", pname, filesep, fname); // Check whether file exists. if (ret != -1) { struct stat statbuf; return os::stat(buffer, &statbuf) == 0; } return false; } // Frees all memory allocated on the heap for the // supplied array of arrays of chars (a), where n // is the number of elements in the array. static void free_array_of_char_arrays(char** a, size_t n) { while (n > 0) { n--; if (a[n] != NULL) { FREE_C_HEAP_ARRAY(char, a[n]); } } FREE_C_HEAP_ARRAY(char*, a); } bool os::dll_locate_lib(char *buffer, size_t buflen, const char* pname, const char* fname) { bool retval = false; size_t fullfnamelen = strlen(JNI_LIB_PREFIX) + strlen(fname) + strlen(JNI_LIB_SUFFIX); char* fullfname = NEW_C_HEAP_ARRAY(char, fullfnamelen + 1, mtInternal); if (dll_build_name(fullfname, fullfnamelen + 1, fname)) { const size_t pnamelen = pname ? strlen(pname) : 0; if (pnamelen == 0) { // If no path given, use current working directory. const char* p = get_current_directory(buffer, buflen); if (p != NULL) { const size_t plen = strlen(buffer); const char lastchar = buffer[plen - 1]; retval = conc_path_file_and_check(buffer, &buffer[plen], buflen - plen, "", lastchar, fullfname); } } else if (strchr(pname, *os::path_separator()) != NULL) { // A list of paths. Search for the path that contains the library. size_t n; char** pelements = split_path(pname, &n, fullfnamelen); if (pelements != NULL) { for (size_t i = 0; i < n; i++) { char* path = pelements[i]; // Really shouldn't be NULL, but check can't hurt. size_t plen = (path == NULL) ? 0 : strlen(path); if (plen == 0) { continue; // Skip the empty path values. } const char lastchar = path[plen - 1]; retval = conc_path_file_and_check(buffer, buffer, buflen, path, lastchar, fullfname); if (retval) break; } // Release the storage allocated by split_path. free_array_of_char_arrays(pelements, n); } } else { // A definite path. const char lastchar = pname[pnamelen-1]; retval = conc_path_file_and_check(buffer, buffer, buflen, pname, lastchar, fullfname); } } FREE_C_HEAP_ARRAY(char*, fullfname); return retval; } // --------------------- sun.misc.Signal (optional) --------------------- // SIGBREAK is sent by the keyboard to query the VM state #ifndef SIGBREAK #define SIGBREAK SIGQUIT #endif // sigexitnum_pd is a platform-specific special signal used for terminating the Signal threa static void signal_thread_entry(JavaThread* thread, TRAPS) { os::set_priority(thread, NearMaxPriority); while (true) { int sig; { // FIXME : Currently we have not decided what should be the status // for this java thread blocked here. Once we decide about // that we should fix this. sig = os::signal_wait(); } if (sig == os::sigexitnum_pd()) { // Terminate the signal thread return; } switch (sig) { case SIGBREAK: { #if INCLUDE_SERVICES // Check if the signal is a trigger to start the Attach Listener - in that // case don't print stack traces. if (!DisableAttachMechanism) { // Attempt to transit state to AL_INITIALIZING. AttachListenerState cur_state = AttachListener::transit_state(AL_INITIALIZING, AL_NO if (cur_state == AL_INITIALIZING) { // Attach Listener has been started to initialize. Ignore this signal. continue; } else if (cur_state == AL_NOT_INITIALIZED) { // Start to initialize. if (AttachListener::is_init_trigger()) { // Attach Listener has been initialized. // Accept subsequent request. continue; } else { // Attach Listener could not be started. // So we need to transit the state to AL_NOT_INITIALIZED. AttachListener::set_state(AL_NOT_INITIALIZED); } } else if (AttachListener::check_socket_file()) { // Attach Listener has been started, but unix domain socket file // does not exist. So restart Attach Listener. continue; } } #endif // Print stack traces // Any SIGBREAK operations added here should make sure to flush // the output stream (e.g. tty->flush()) after output. See 4803766. // Each module also prints an extra carriage return after its output. VM_PrintThreads op(tty, PrintConcurrentLocks, false /* no extended info */, true /* print JN VMThread::execute(&op); VM_FindDeadlocks op1(tty); VMThread::execute(&op1); Universe::print_heap_at_SIGBREAK(); if (PrintClassHistogram) { VM_GC_HeapInspection op1(tty, true /* force full GC before heap inspection */); VMThread::execute(&op1); } if (JvmtiExport::should_post_data_dump()) { JvmtiExport::post_data_dump(); } break; } default: { // Dispatch the signal to java HandleMark hm(THREAD); Klass* klass = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_misc_Signa if (klass != NULL) { JavaValue result(T_VOID); JavaCallArguments args; args.push_int(sig); JavaCalls::call_static( &result, klass, vmSymbols::dispatch_name(), vmSymbols::int_void_signature(), &args, THREAD ); } if (HAS_PENDING_EXCEPTION) { // tty is initialized early so we don't expect it to be null, but // if it is we can't risk doing an initialization that might // trigger additional out-of-memory conditions if (tty != NULL) { char klass_name[256]; char tmp_sig_name[16]; const char* sig_name = "UNKNOWN"; InstanceKlass::cast(PENDING_EXCEPTION->klass())-> name()->as_klass_external_name(klass_name, 256); if (os::exception_name(sig, tmp_sig_name, 16) != NULL) sig_name = tmp_sig_name; warning("Exception %s occurred dispatching signal %s to handler" "- the VM may need to be forcibly terminated", klass_name, sig_name ); } CLEAR_PENDING_EXCEPTION; } } } } } void os::init_before_ergo() { initialize_initial_active_processor_count(); // We need to initialize large page support here because ergonomics takes some // decisions depending on large page support and the calculated large page size. large_page_init(); StackOverflow::initialize_stack_zone_sizes(); // VM version initialization identifies some characteristics of the // platform that are used during ergonomic decisions. VM_Version::init_before_ergo(); } void os::initialize_jdk_signal_support(TRAPS) { if (!ReduceSignalUsage) { // Setup JavaThread for processing signals const char* name = "Signal Dispatcher"; Handle thread_oop = JavaThread::create_system_thread_object(name, true /* visible */, CH JavaThread* thread = new JavaThread(&signal_thread_entry); JavaThread::vm_exit_on_osthread_failure(thread); JavaThread::start_internal_daemon(THREAD, thread, thread_oop, NearMaxPriority); } } void os::terminate_signal_thread() { if (!ReduceSignalUsage) signal_notify(sigexitnum_pd()); } // --------------------- loading libraries --------------------- typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); extern struct JavaVM_ main_vm; static void* _native_java_library = NULL; void* os::native_java_library() { if (_native_java_library == NULL) { char buffer[JVM_MAXPATHLEN]; char ebuf[1024]; // Load java dll if (dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), "java")) { _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); } if (_native_java_library == NULL) { vm_exit_during_initialization("Unable to load native library", ebuf); } #if defined(__OpenBSD__) // Work-around OpenBSD's lack of $ORIGIN support by pre-loading libnet.so // ignore errors if (dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), "net")) { dll_load(buffer, ebuf, sizeof(ebuf)); } #endif } return _native_java_library; } /* * Support for finding Agent_On(Un)Load/Attach<_lib_name> if it exists. * If check_lib == true then we are looking for an * Agent_OnLoad_lib_name or Agent_OnAttach_lib_name function to determine if * this library is statically linked into the image. * If check_lib == false then we will look for the appropriate symbol in the * executable if agent_lib->is_static_lib() == true or in the shared library * referenced by 'handle'. */ void* os::find_agent_function(AgentLibrary *agent_lib, bool check_lib, const char *syms[], size_t syms_len) { assert(agent_lib != NULL, "sanity check"); const char *lib_name; void *handle = agent_lib->os_lib(); void *entryName = NULL; char *agent_function_name; size_t i; // If checking then use the agent name otherwise test is_static_lib() to // see how to process this lookup lib_name = ((check_lib || agent_lib->is_static_lib()) ? agent_lib->name() : NULL); for (i = 0; i < syms_len; i++) { agent_function_name = build_agent_function_name(syms[i], lib_name, agent_lib->is_abso if (agent_function_name == NULL) { break; } entryName = dll_lookup(handle, agent_function_name); FREE_C_HEAP_ARRAY(char, agent_function_name); if (entryName != NULL) { break; } } return entryName; } // See if the passed in agent is statically linked into the VM image. bool os::find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], size_t syms_len) { void *ret; void *proc_handle; void *save_handle; assert(agent_lib != NULL, "sanity check"); if (agent_lib->name() == NULL) { return false; } proc_handle = get_default_process_handle(); // Check for Agent_OnLoad/Attach_lib_name function save_handle = agent_lib->os_lib(); // We want to look in this process' symbol table. agent_lib->set_os_lib(proc_handle); ret = find_agent_function(agent_lib, true, syms, syms_len); if (ret != NULL) { // Found an entry point like Agent_OnLoad_lib_name so we have a static agent agent_lib->set_valid(); agent_lib->set_static_lib(true); return true; } agent_lib->set_os_lib(save_handle); return false; } // --------------------- heap allocation utilities --------------------- char *os::strdup(const char *str, MEMFLAGS flags) { size_t size = strlen(str); char *dup_str = (char *)malloc(size + 1, flags); if (dup_str == NULL) return NULL; strcpy(dup_str, str); return dup_str; } char* os::strdup_check_oom(const char* str, MEMFLAGS flags) { char* p = os::strdup(str, flags); if (p == NULL) { vm_exit_out_of_memory(strlen(str) + 1, OOM_MALLOC_ERROR, "os::strdup_check_oom"); } return p; } // // This function supports testing of the malloc out of memory // condition without really running the system out of memory. // static bool has_reached_max_malloc_test_peak(size_t alloc_size) { if (MallocMaxTestWords > 0) { size_t words = (alloc_size / BytesPerWord); if ((cur_malloc_words + words) > MallocMaxTestWords) { return true; } Atomic::add(&cur_malloc_words, words); } return false; } #ifdef ASSERT static void check_crash_protection() { assert(!ThreadCrashProtection::is_crash_protected(Thread::current_or_null()), "not allowed when crash protection is set"); } static void break_if_ptr_caught(void* ptr) { if (p2i(ptr) == (intptr_t)MallocCatchPtr) { log_warning(malloc, free)("ptr caught: " PTR_FORMAT, p2i(ptr)); breakpoint(); } } #endif // ASSERT void* os::malloc(size_t size, MEMFLAGS flags) { return os::malloc(size, flags, CALLER_PC); } void* os::malloc(size_t size, MEMFLAGS memflags, const NativeCallStack& stack) { // Special handling for NMT preinit phase before arguments are parsed void* rc = NULL; if (NMTPreInit::handle_malloc(&rc, size)) { // No need to fill with 0 because DumpSharedSpaces doesn't use these // early allocations. return rc; } DEBUG_ONLY(check_crash_protection()); // On malloc(0), implementations of malloc(3) have the choice to return either // NULL or a unique non-NULL pointer. To unify libc behavior across our platforms // we chose the latter. size = MAX2((size_t)1, size); // For the test flag -XX:MallocMaxTestWords if (has_reached_max_malloc_test_peak(size)) { return NULL; } const size_t outer_size = size + MemTracker::overhead_per_malloc(); // Check for overflow. if (outer_size < size) { return NULL; } ALLOW_C_FUNCTION(::malloc, void* const outer_ptr = ::malloc(outer_size);) if (outer_ptr == NULL) { return NULL; } void* const inner_ptr = MemTracker::record_malloc((address)outer_ptr, size, memflags, s if (DumpSharedSpaces) { // Need to deterministically fill all the alignment gaps in C++ structures. ::memset(inner_ptr, 0, size); } else { DEBUG_ONLY(::memset(inner_ptr, uninitBlockPad, size);) } DEBUG_ONLY(break_if_ptr_caught(inner_ptr);) return inner_ptr; } void* os::realloc(void *memblock, size_t size, MEMFLAGS flags) { return os::realloc(memblock, size, flags, CALLER_PC); } void* os::realloc(void *memblock, size_t size, MEMFLAGS memflags, const NativeCallStack&&n // Special handling for NMT preinit phase before arguments are parsed void* rc = NULL; if (NMTPreInit::handle_realloc(&rc, memblock, size)) { return rc; } if (memblock == NULL) { return os::malloc(size, memflags, stack); } DEBUG_ONLY(check_crash_protection()); // On realloc(p, 0), implementers of realloc(3) have the choice to return either // NULL or a unique non-NULL pointer. To unify libc behavior across our platforms // we chose the latter. size = MAX2((size_t)1, size); // For the test flag -XX:MallocMaxTestWords if (has_reached_max_malloc_test_peak(size)) { return NULL; } if (MemTracker::enabled()) { // NMT realloc handling const size_t new_outer_size = size + MemTracker::overhead_per_malloc(); // Handle size overflow. if (new_outer_size < size) { return NULL; } // Perform integrity checks on and mark the old block as dead *before* calling the real realloc( // may invalidate the old block, including its header. MallocHeader* header = MallocTracker::malloc_header(memblock); header->assert_block_integrity(); // Assert block hasn't been tampered with. const MallocHeader::FreeInfo free_info = header->free_info(); header->mark_block_as_dead(); // the real realloc ALLOW_C_FUNCTION(::realloc, void* const new_outer_ptr = ::realloc(header, new_outer_si if (new_outer_ptr == NULL) { // realloc(3) failed and the block still exists. // We have however marked it as dead, revert this change. header->revive(); return nullptr; } // realloc(3) succeeded, variable header now points to invalid memory and we need to deaccount MemTracker::deaccount(free_info); // After a successful realloc(3), we account the resized block with its new size // to NMT. void* const new_inner_ptr = MemTracker::record_malloc(new_outer_ptr, size, memflags, st #ifdef ASSERT size_t old_size = free_info.size; if (old_size < size) { // We also zap the newly extended region. ::memset((char*)new_inner_ptr + old_size, uninitBlockPad, size - old_size); } #endif rc = new_inner_ptr; } else { // NMT disabled. ALLOW_C_FUNCTION(::realloc, rc = ::realloc(memblock, size);) if (rc == NULL) { return NULL; } } DEBUG_ONLY(break_if_ptr_caught(rc);) return rc; } void os::free(void *memblock) { // Special handling for NMT preinit phase before arguments are parsed if (NMTPreInit::handle_free(memblock)) { return; } if (memblock == NULL) { return; } DEBUG_ONLY(break_if_ptr_caught(memblock);) // When NMT is enabled this checks for heap overwrites, then deaccounts the old block. void* const old_outer_ptr = MemTracker::record_free(memblock); ALLOW_C_FUNCTION(::free, ::free(old_outer_ptr);) } void os::init_random(unsigned int initval) { _rand_seed = initval; } int os::next_random(unsigned int rand_seed) { /* standard, well-known linear congruential random generator with * next_rand = (16807*seed) mod (2**31-1) * see * (1) "Random Number Generators: Good Ones Are Hard to Find", * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), * (2) "Two Fast Implementations of the 'Minimal Standard' Random * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. */ const unsigned int a = 16807; const unsigned int m = 2147483647; const int q = m / a; assert(q == 127773, "weird math"); const int r = m % a; assert(r == 2836, "weird math"); // compute az=2^31p+q unsigned int lo = a * (rand_seed & 0xFFFF); unsigned int hi = a * (rand_seed >> 16); lo += (hi & 0x7FFF) << 16; // if q overflowed, ignore the overflow and increment q if (lo > m) { lo &= m; ++lo; } lo += hi >> 15; // if (p+q) overflowed, ignore the overflow and increment (p+q) if (lo > m) { lo &= m; ++lo; } return lo; } int os::random() { // Make updating the random seed thread safe. while (true) { unsigned int seed = _rand_seed; unsigned int rand = next_random(seed); if (Atomic::cmpxchg(&_rand_seed, seed, rand, memory_order_relaxed) == seed) { return static_cast<int>(rand); } } } // The INITIALIZED state is distinguished from the SUSPENDED state because the // conditions in which a thread is first started are different from those in which // a suspension is resumed. These differences make it hard for us to apply the // tougher checks when starting threads that we want to do when resuming them. // However, when start_thread is called as a result of Thread.start, on a Java // thread, the operation is synchronized on the Java Thread object. So there // cannot be a race to start the thread and hence for the thread to exit while // we are working on it. Non-Java threads that start Java threads either have // to do so in a context in which races are impossible, or should do appropriate // locking. void os::start_thread(Thread* thread) { OSThread* osthread = thread->osthread(); osthread->set_state(RUNNABLE); pd_start_thread(thread); } void os::abort(bool dump_core) { abort(dump_core && CreateCoredumpOnCrash, NULL, NULL); } //--------------------------------------------------------------------------- // Helper functions for fatal error handler bool os::print_function_and_library_name(outputStream* st, address addr, char* buf, int buflen, bool shorten_paths, bool demangle, bool strip_arguments) { // If no scratch buffer given, allocate one here on stack. // (used during error handling; its a coin toss, really, if on-stack allocation // is worse than (raw) C-heap allocation in that case). char* p = buf; if (p == NULL) { p = (char*)::alloca(O_BUFLEN); buflen = O_BUFLEN; } int offset = 0; bool have_function_name = dll_address_to_function_name(addr, p, buflen, &offset, demangle); bool is_function_descriptor = false; #ifdef HAVE_FUNCTION_DESCRIPTORS // When we deal with a function descriptor instead of a real code pointer, try to // resolve it. There is a small chance that a random pointer given to this function // may just happen to look like a valid descriptor, but this is rare and worth the // risk to see resolved function names. But we will print a little suffix to mark // this as a function descriptor for the reader (see below). if (!have_function_name && os::is_readable_pointer(addr)) { address addr2 = (address)os::resolve_function_descriptor(addr); if (have_function_name = is_function_descriptor = dll_address_to_function_name(addr2, p, buflen, &offset, demangle)) { addr = addr2; } } #endif // HAVE_FUNCTION_DESCRIPTORS if (have_function_name) { // Print function name, optionally demangled if (demangle && strip_arguments) { char* args_start = strchr(p, '('); if (args_start != NULL) { *args_start = '\0'; } } // Print offset. Omit printing if offset is zero, which makes the output // more readable if we print function pointers. if (offset == 0) { st->print("%s", p); } else { st->print("%s+%d", p, offset); } } else { st->print(PTR_FORMAT, p2i(addr)); } offset = 0; const bool have_library_name = dll_address_to_library_name(addr, p, buflen, &offset); if (have_library_name) { // Cut path parts if (shorten_paths) { char* p2 = strrchr(p, os::file_separator()[0]); if (p2 != NULL) { p = p2 + 1; } } st->print(" in %s", p); if (!have_function_name) { // Omit offset if we already printed the function offset st->print("+%d", offset); } } // Write a trailing marker if this was a function descriptor if (have_function_name && is_function_descriptor) { st->print_raw(" (FD)"); } return have_function_name || have_library_name; } void os::print_hex_dump(outputStream* st, address start, address end, int unitsize, int bytes_per_line, address logical_start) { assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); start = align_down(start, unitsize); logical_start = align_down(logical_start, unitsize); bytes_per_line = align_up(bytes_per_line, 8); int cols = 0; int cols_per_line = bytes_per_line / unitsize; address p = start; address logical_p = logical_start; // Print out the addresses as if we were starting from logical_start. st->print(PTR_FORMAT ": ", p2i(logical_p)); while (p < end) { if (is_readable_pointer(p)) { switch (unitsize) { case 1: st->print("%02x", *(u1*)p); break; case 2: st->print("%04x", *(u2*)p); break; case 4: st->print("%08x", *(u4*)p); break; case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; } } else { st->print("%*.*s", 2*unitsize, 2*unitsize, "????????????????"); } p += unitsize; logical_p += unitsize; cols++; if (cols >= cols_per_line && p < end) { cols = 0; st->cr(); st->print(PTR_FORMAT ": ", p2i(logical_p)); } else { st->print(" "); } } st->cr(); } void os::print_dhm(outputStream* st, const char* startStr, long sec) { long days = sec/86400; long hours = (sec/3600) - (days * 24); long minutes = (sec/60) - (days * 1440) - (hours * 60); if (startStr == NULL) startStr = ""; st->print_cr("%s %ld days %ld:%02ld hours", startStr, days, hours, minutes); } void os::print_tos(outputStream* st, address sp) { st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp)); print_hex_dump(st, sp, sp + 512, sizeof(intptr_t)); } void os::print_instructions(outputStream* st, address pc, int unitsize) { st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc)); print_hex_dump(st, pc - 256, pc + 256, unitsize); } void os::print_environment_variables(outputStream* st, const char** env_list) { if (env_list) { st->print_cr("Environment Variables:"); for (int i = 0; env_list[i] != NULL; i++) { char *envvar = ::getenv(env_list[i]); if (envvar != NULL) { st->print("%s", env_list[i]); st->print("="); st->print("%s", envvar); // Use separate cr() printing to avoid unnecessary buffer operations that might cause truncat st->cr(); } } } } void os::print_cpu_info(outputStream* st, char* buf, size_t buflen) { // cpu st->print("CPU:"); #if defined(__APPLE__) && !defined(ZERO) if (VM_Version::is_cpu_emulated()) { st->print(" (EMULATED)"); } #endif st->print(" total %d", os::processor_count()); // It's not safe to query number of active processors after crash // st->print("(active %d)", os::active_processor_count()); but we can // print the initial number of active processors. // We access the raw value here because the assert in the accessor will // fail if the crash occurs before initialization of this value. st->print(" (initial active %d)", _initial_active_processor_count); st->print(" %s", VM_Version::features_string()); st->cr(); pd_print_cpu_info(st, buf, buflen); } // Print a one line string summarizing the cpu, number of cores, memory, and operating system ve void os::print_summary_info(outputStream* st, char* buf, size_t buflen) { st->print("Host: "); #ifndef PRODUCT if (get_host_name(buf, buflen)) { st->print("%s, ", buf); } #endif // PRODUCT get_summary_cpu_info(buf, buflen); st->print("%s, ", buf); size_t mem = physical_memory()/G; if (mem == 0) { // for low memory systems mem = physical_memory()/M; st->print("%d cores, " SIZE_FORMAT "M, ", processor_count(), mem); } else { st->print("%d cores, " SIZE_FORMAT "G, ", processor_count(), mem); } get_summary_os_info(buf, buflen); st->print_raw(buf); st->cr(); } void os::print_date_and_time(outputStream *st, char* buf, size_t buflen) { const int secs_per_day = 86400; const int secs_per_hour = 3600; const int secs_per_min = 60; time_t tloc; (void)time(&tloc); char* timestring = ctime(&tloc); // ctime adds newline. // edit out the newline char* nl = strchr(timestring, '\n'); if (nl != NULL) { *nl = '\0'; } struct tm tz; if (localtime_pd(&tloc, &tz) != NULL) { wchar_t w_buf[80]; size_t n = ::wcsftime(w_buf, 80, L"%Z", &tz); if (n > 0) { ::wcstombs(buf, w_buf, buflen); st->print("Time: %s %s", timestring, buf); } else { st->print("Time: %s", timestring); } } else { st->print("Time: %s", timestring); } double t = os::elapsedTime(); // NOTE: a crash using printf("%f",...) on Linux was historically noted here. int eltime = (int)t; // elapsed time in seconds int eltimeFraction = (int) ((t - eltime) * 1000000); // print elapsed time in a human-readable format: int eldays = eltime / secs_per_day; int day_secs = eldays * secs_per_day; int elhours = (eltime - day_secs) / secs_per_hour; int hour_secs = elhours * secs_per_hour; int elmins = (eltime - day_secs - hour_secs) / secs_per_min; int minute_secs = elmins * secs_per_min; int elsecs = (eltime - day_secs - hour_secs - minute_secs); st->print_cr(" elapsed time: %d.%06d seconds (%dd %dh %dm %ds)", eltime, eltimeFrac } // Check if pointer can be read from (4-byte read access). // Helps to prove validity of a not-NULL pointer. // Returns true in very early stages of VM life when stub is not yet generated. bool os::is_readable_pointer(const void* p) { int* const aligned = (int*) align_down((intptr_t)p, 4); int cafebabe = 0xcafebabe; // tester value 1 int deadbeef = 0xdeadbeef; // tester value 2 return (SafeFetch32(aligned, cafebabe) != cafebabe) || (SafeFetch32(aligned, deadbeef) ! } bool os::is_readable_range(const void* from, const void* to) { if ((uintptr_t)from >= (uintptr_t)to) return false; for (uintptr_t p = align_down((uintptr_t)from, min_page_size()); p < (uintptr_t)to; p += min if (!is_readable_pointer((const void*)p)) { return false; } } return true; } // moved from debug.cpp (used to be find()) but still called from there // The verbose parameter is only set by the debug code in one case void os::print_location(outputStream* st, intptr_t x, bool verbose) { address addr = (address)x; // Handle NULL first, so later checks don't need to protect against it. if (addr == NULL) { st->print_cr("0x0 is NULL"); return; } // Check if addr points into a code blob. CodeBlob* b = CodeCache::find_blob(addr); if (b != NULL) { b->dump_for_addr(addr, st, verbose); return; } // Check if addr points into Java heap. if (Universe::heap()->print_location(st, addr)) { return; } bool accessible = is_readable_pointer(addr); // Check if addr is a JNI handle. if (align_down((intptr_t)addr, sizeof(intptr_t)) != 0 && accessible) { if (JNIHandles::is_global_handle((jobject) addr)) { st->print_cr(INTPTR_FORMAT " is a global jni handle", p2i(addr)); return; } if (JNIHandles::is_weak_global_handle((jobject) addr)) { st->print_cr(INTPTR_FORMAT " is a weak global jni handle", p2i(addr)); return; } } // Check if addr belongs to a Java thread. for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thread = jtiwh.next(); ) { // If the addr is a java thread print information about that. if (addr == (address)thread) { if (verbose) { thread->print_on(st); } else { st->print_cr(INTPTR_FORMAT " is a thread", p2i(addr)); } return; } // If the addr is in the stack region for this thread then report that // and print thread info if (thread->is_in_full_stack(addr)) { st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " INTPTR_FORMAT, p2i(addr), p2i(thread)); if (verbose) thread->print_on(st); return; } } // Check if in metaspace and print types that have vptrs if (Metaspace::contains(addr)) { if (Klass::is_valid((Klass*)addr)) { st->print_cr(INTPTR_FORMAT " is a pointer to class: ", p2i(addr)); ((Klass*)addr)->print_on(st); } else if (Method::is_valid_method((const Method*)addr)) { ((Method*)addr)->print_value_on(st); st->cr(); } else { // Use addr->print() from the debugger instead (not here) st->print_cr(INTPTR_FORMAT " is pointing into metadata", p2i(addr)); } return; } // Compressed klass needs to be decoded first. #ifdef _LP64 if (UseCompressedClassPointers && ((uintptr_t)addr &~ (uintptr_t)max_juint) == 0) { narrowKlass narrow_klass = (narrowKlass)(uintptr_t)addr; Klass* k = CompressedKlassPointers::decode_raw(narrow_klass); if (Klass::is_valid(k)) { st->print_cr(UINT32_FORMAT " is a compressed pointer to class: " INTPTR_FORMAT, narr k->print_on(st); return; } } #endif // Try an OS specific find if (os::find(addr, st)) { return; } if (accessible) { st->print(INTPTR_FORMAT " points into unknown readable memory:", p2i(addr)); if (is_aligned(addr, sizeof(intptr_t))) { st->print(" " PTR_FORMAT " |", *(intptr_t*)addr); } for (address p = addr; p < align_up(addr + 1, sizeof(intptr_t)); ++p) { st->print(" %02x", *(u1*)p); } st->cr(); return; } st->print_cr(INTPTR_FORMAT " is an unknown value", p2i(addr)); } bool is_pointer_bad(intptr_t* ptr) { return !is_aligned(ptr, sizeof(uintptr_t)) || !os::is_readable_pointer(ptr); } // Looks like all platforms can use the same function to check if C // stack is walkable beyond current frame. // Returns true if this is not the case, i.e. the frame is possibly // the first C frame on the stack. bool os::is_first_C_frame(frame* fr) { #ifdef _WINDOWS return true; // native stack isn't walkable on windows this way. #endif // Load up sp, fp, sender sp and sender fp, check for reasonable values. // Check usp first, because if that's bad the other accessors may fault // on some architectures. Ditto ufp second, etc. if (is_pointer_bad(fr->sp())) return true; uintptr_t ufp = (uintptr_t)fr->fp(); if (is_pointer_bad(fr->fp())) return true; uintptr_t old_sp = (uintptr_t)fr->sender_sp(); if ((uintptr_t)fr->sender_sp() == (uintptr_t)-1 || is_pointer_bad(fr->sender_sp())) retu uintptr_t old_fp = (uintptr_t)fr->link_or_null(); if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp || is_pointer_bad(fr->link_or_null())) return true; // stack grows downwards; if old_fp is below current fp or if the stack // frame is too large, either the stack is corrupted or fp is not saved // on stack (i.e. on x86, ebp may be used as general register). The stack // is not walkable beyond current frame. if (old_fp < ufp) return true; if (old_fp - ufp > 64 * K) return true; return false; } // Set up the boot classpath. char* os::format_boot_path(const char* format_string, const char* home, int home_len, char fileSep, char pathSep) { assert((fileSep == '/' && pathSep == ':') || (fileSep == '\\' && pathSep == ';'), "unexpected separator chars"); // Scan the format string to determine the length of the actual // boot classpath, and handle platform dependencies as well. int formatted_path_len = 0; const char* p; for (p = format_string; *p != 0; ++p) { if (*p == '%') formatted_path_len += home_len - 1; ++formatted_path_len; } char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1, mtInternal); // Create boot classpath from format, substituting separator chars and // java home directory. char* q = formatted_path; for (p = format_string; *p != 0; ++p) { switch (*p) { case '%': strcpy(q, home); q += home_len; break; case '/': *q++ = fileSep; break; case ':': *q++ = pathSep; break; default: *q++ = *p; } } *q = '\0'; assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); return formatted_path; } // This function is a proxy to fopen, it tries to add a non standard flag ('e' or 'N') // that ensures automatic closing of the file on exec. If it can not find support in // the underlying c library, it will make an extra system call (fcntl) to ensure automatic // closing of the file on exec. FILE* os::fopen(const char* path, const char* mode) { char modified_mode[20]; assert(strlen(mode) + 1 < sizeof(modified_mode), "mode chars plus one extra must fit i sprintf(modified_mode, "%s" LINUX_ONLY("e") BSD_ONLY("e") WINDOWS_ONLY("N"), mode); FILE* file = ::fopen(path, modified_mode); #if !(defined LINUX || defined BSD || defined _WINDOWS) // assume fcntl FD_CLOEXEC support as a backup solution when 'e' or 'N' // is not supported as mode in fopen if (file != NULL) { int fd = fileno(file); if (fd != -1) { int fd_flags = fcntl(fd, F_GETFD); if (fd_flags != -1) { fcntl(fd, F_SETFD, fd_flags | FD_CLOEXEC); } } } #endif return file; } bool os::set_boot_path(char fileSep, char pathSep) { const char* home = Arguments::get_java_home(); int home_len = (int)strlen(home); struct stat st; // modular image if "modules" jimage exists char* jimage = format_boot_path("%/lib/" MODULES_IMAGE_NAME, home, home_len, fileSep, pa if (jimage == NULL) return false; bool has_jimage = (os::stat(jimage, &st) == 0); if (has_jimage) { Arguments::set_boot_class_path(jimage, true); FREE_C_HEAP_ARRAY(char, jimage); return true; } FREE_C_HEAP_ARRAY(char, jimage); // check if developer build with exploded modules char* base_classes = format_boot_path("%/modules/" JAVA_BASE_NAME, home, home_len, file if (base_classes == NULL) return false; if (os::stat(base_classes, &st) == 0) { Arguments::set_boot_class_path(base_classes, false); FREE_C_HEAP_ARRAY(char, base_classes); return true; } FREE_C_HEAP_ARRAY(char, base_classes); return false; } bool os::file_exists(const char* filename) { struct stat statbuf; if (filename == NULL || strlen(filename) == 0) { return false; } return os::stat(filename, &statbuf) == 0; } // Splits a path, based on its separator, the number of // elements is returned back in "elements". // file_name_length is used as a modifier for each path's // length when compared to JVM_MAXPATHLEN. So if you know // each returned path will have something appended when // in use, you can pass the length of that in // file_name_length, to ensure we detect if any path // exceeds the maximum path length once prepended onto // the sub-path/file name. // It is the callers responsibility to: // a> check the value of "elements", which may be 0. // b> ignore any empty path elements // c> free up the data. char** os::split_path(const char* path, size_t* elements, size_t file_name_length) { *elements = (size_t)0; if (path == NULL || strlen(path) == 0 || file_name_length == (size_t)NULL) { return NULL; } const char psepchar = *os::path_separator(); char* inpath = NEW_C_HEAP_ARRAY(char, strlen(path) + 1, mtInternal); strcpy(inpath, path); size_t count = 1; char* p = strchr(inpath, psepchar); // Get a count of elements to allocate memory while (p != NULL) { count++; p++; p = strchr(p, psepchar); } char** opath = NEW_C_HEAP_ARRAY(char*, count, mtInternal); // do the actual splitting p = inpath; for (size_t i = 0 ; i < count ; i++) { size_t len = strcspn(p, os::path_separator()); if (len + file_name_length > JVM_MAXPATHLEN) { // release allocated storage before exiting the vm free_array_of_char_arrays(opath, i++); vm_exit_during_initialization("The VM tried to use a path that exceeds the maxim "this system. Review path-containing parameters and properties, such as " "sun.boot.library.path, to identify potential sources for this path."); } // allocate the string and add terminator storage char* s = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); strncpy(s, p, len); s[len] = '\0'; opath[i] = s; p += len + 1; } FREE_C_HEAP_ARRAY(char, inpath); *elements = count; return opath; } // Returns true if the current stack pointer is above the stack shadow // pages, false otherwise. bool os::stack_shadow_pages_available(Thread *thread, const methodHandle& method, if (!thread->is_Java_thread()) return false; // Check if we have StackShadowPages above the guard zone. This parameter // is dependent on the depth of the maximum VM call stack possible from // the handler for stack overflow. 'instanceof' in the stack overflow // handler or a println uses at least 8k stack of VM and native code // respectively. const int framesize_in_bytes = Interpreter::size_top_interpreter_activation(method()) * wordSize; address limit = JavaThread::cast(thread)->stack_overflow_state()->shadow_zone_safe_li return sp > (limit + framesize_in_bytes); } size_t os::page_size_for_region(size_t region_size, size_t min_pages, bool must_be_ali assert(min_pages > 0, "sanity"); if (UseLargePages) { const size_t max_page_size = region_size / min_pages; for (size_t page_size = page_sizes().largest(); page_size != 0; page_size = page_sizes().next_smaller(page_size)) { if (page_size <= max_page_size) { if (!must_be_aligned || is_aligned(region_size, page_size)) { return page_size; } } } } return vm_page_size(); } size_t os::page_size_for_region_aligned(size_t region_size, size_t min_pages) { return page_size_for_region(region_size, min_pages, true); } size_t os::page_size_for_region_unaligned(size_t region_size, size_t min_pages) { return page_size_for_region(region_size, min_pages, false); } #ifndef MAX_PATH #define MAX_PATH (2 * K) #endif void os::pause() { char filename[MAX_PATH]; if (PauseAtStartupFile && PauseAtStartupFile[0]) { jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile); } else { jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); } int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); if (fd != -1) { struct stat buf; ::close(fd); while (::stat(filename, &buf) == 0) { #if defined(_WINDOWS) Sleep(100); #else (void)::poll(NULL, 0, 100); #endif } } else { jio_fprintf(stderr, "Could not open pause file '%s', continuing immediately.\n", filename); } } static const char* errno_to_string (int e, bool short_text) { #define ALL_SHARED_ENUMS(X) \ X(E2BIG, "Argument list too long") \ X(EACCES, "Permission denied") \ X(EADDRINUSE, "Address in use") \ X(EADDRNOTAVAIL, "Address not available") \ X(EAFNOSUPPORT, "Address family not supported") \ X(EAGAIN, "Resource unavailable, try again") \ X(EALREADY, "Connection already in progress") \ X(EBADF, "Bad file descriptor") \ X(EBADMSG, "Bad message") \ X(EBUSY, "Device or resource busy") \ X(ECANCELED, "Operation canceled") \ X(ECHILD, "No child processes") \ X(ECONNABORTED, "Connection aborted") \ X(ECONNREFUSED, "Connection refused") \ X(ECONNRESET, "Connection reset") \ X(EDEADLK, "Resource deadlock would occur") \ X(EDESTADDRREQ, "Destination address required") \ X(EDOM, "Mathematics argument out of domain of function") \ X(EEXIST, "File exists") \ X(EFAULT, "Bad address") \ X(EFBIG, "File too large") \ X(EHOSTUNREACH, "Host is unreachable") \ X(EIDRM, "Identifier removed") \ X(EILSEQ, "Illegal byte sequence") \ X(EINPROGRESS, "Operation in progress") \ X(EINTR, "Interrupted function") \ X(EINVAL, "Invalid argument") \ X(EIO, "I/O error") \ X(EISCONN, "Socket is connected") \ X(EISDIR, "Is a directory") \ X(ELOOP, "Too many levels of symbolic links") \ X(EMFILE, "Too many open files") \ X(EMLINK, "Too many links") \ X(EMSGSIZE, "Message too large") \ X(ENAMETOOLONG, "Filename too long") \ X(ENETDOWN, "Network is down") \ X(ENETRESET, "Connection aborted by network") \ X(ENETUNREACH, "Network unreachable") \ X(ENFILE, "Too many files open in system") \ X(ENOBUFS, "No buffer space available") \ X(ENODATA, "No message is available on the STREAM head read queue") \ X(ENODEV, "No such device") \ X(ENOENT, "No such file or directory") \ X(ENOEXEC, "Executable file format error") \ X(ENOLCK, "No locks available") \ X(ENOLINK, "Reserved") \ X(ENOMEM, "Not enough space") \ X(ENOMSG, "No message of the desired type") \ X(ENOPROTOOPT, "Protocol not available") \ X(ENOSPC, "No space left on device") \ X(ENOSR, "No STREAM resources") \ X(ENOSTR, "Not a STREAM") \ X(ENOSYS, "Function not supported") \ X(ENOTCONN, "The socket is not connected") \ X(ENOTDIR, "Not a directory") \ X(ENOTEMPTY, "Directory not empty") \ X(ENOTSOCK, "Not a socket") \ X(ENOTSUP, "Not supported") \ X(ENOTTY, "Inappropriate I/O control operation") \ X(ENXIO, "No such device or address") \ X(EOPNOTSUPP, "Operation not supported on socket") \ X(EOVERFLOW, "Value too large to be stored in data type") \ X(EPERM, "Operation not permitted") \ X(EPIPE, "Broken pipe") \ X(EPROTO, "Protocol error") \ X(EPROTONOSUPPORT, "Protocol not supported") \ X(EPROTOTYPE, "Protocol wrong type for socket") \ X(ERANGE, "Result too large") \ X(EROFS, "Read-only file system") \ X(ESPIPE, "Invalid seek") \ X(ESRCH, "No such process") \ X(ETIME, "Stream ioctl() timeout") \ X(ETIMEDOUT, "Connection timed out") \ X(ETXTBSY, "Text file busy") \ X(EWOULDBLOCK, "Operation would block") \ X(EXDEV, "Cross-device link") #define DEFINE_ENTRY(e, text) { e, #e, text }, static const struct { int v; const char* short_text; const char* long_text; } table [] = { ALL_SHARED_ENUMS(DEFINE_ENTRY) // The following enums are not defined on all platforms. #ifdef ESTALE DEFINE_ENTRY(ESTALE, "Reserved") #endif #ifdef EDQUOT DEFINE_ENTRY(EDQUOT, "Reserved") #endif #ifdef EMULTIHOP DEFINE_ENTRY(EMULTIHOP, "Reserved") #endif // End marker. { -1, "Unknown errno", "Unknown error" } }; #undef DEFINE_ENTRY #undef ALL_FLAGS int i = 0; while (table[i].v != -1 && table[i].v != e) { i ++; } return short_text ? table[i].short_text : table[i].long_text; } const char* os::strerror(int e) { return errno_to_string(e, false); } const char* os::errno_name(int e) { return errno_to_string(e, true); } #define trace_page_size_params(size) byte_size_in_exact_unit(size), exact_unit_for_ void os::trace_page_sizes(const char* str, const size_t region_min_size, const size_t region_max_size, const size_t page_size, const char* base, const size_t size) { log_info(pagesize)("%s: " " min=" SIZE_FORMAT "%s" " max=" SIZE_FORMAT "%s" " base=" PTR_FORMAT " page_size=" SIZE_FORMAT "%s" " size=" SIZE_FORMAT "%s", str, trace_page_size_params(region_min_size), trace_page_size_params(region_max_size), p2i(base), trace_page_size_params(page_size), trace_page_size_params(size)); } void os::trace_page_sizes_for_requested_size(const char* str, const size_t requested_size, const size_t page_size, const size_t alignment, const char* base, const size_t size) { log_info(pagesize)("%s:" " req_size=" SIZE_FORMAT "%s" " base=" PTR_FORMAT " page_size=" SIZE_FORMAT "%s" " alignment=" SIZE_FORMAT "%s" " size=" SIZE_FORMAT "%s", str, trace_page_size_params(requested_size), p2i(base), trace_page_size_params(page_size), trace_page_size_params(alignment), trace_page_size_params(size)); } // This is the working definition of a server class machine: // >= 2 physical CPU's and >=2GB of memory, with some fuzz // because the graphics memory (?) sometimes masks physical memory. // If you want to change the definition of a server class machine // on some OS or platform, e.g., >=4GB on Windows platforms, // then you'll have to parameterize this method based on that state, // as was done for logical processors here, or replicate and // specialize this method for each platform. (Or fix os to have // some inheritance structure and use subclassing. Sigh.) // If you want some platform to always or never behave as a server // class machine, change the setting of AlwaysActAsServerClassMachine // and NeverActAsServerClassMachine in globals*.hpp. bool os::is_server_class_machine() { // First check for the early returns if (NeverActAsServerClassMachine) { return false; } if (AlwaysActAsServerClassMachine) { return true; } // Then actually look at the machine bool result = false; const unsigned int server_processors = 2; const julong server_memory = 2UL * G; // We seem not to get our full complement of memory. // We allow some part (1/8?) of the memory to be "missing", // based on the sizes of DIMMs, and maybe graphics cards. const julong missing_memory = 256UL * M; /* Is this a server class machine? */ if ((os::active_processor_count() >= (int)server_processors) && (os::physical_memory() >= (server_memory - missing_memory))) { const unsigned int logical_processors = VM_Version::logical_processors_per_package(); if (logical_processors > 1) { const unsigned int physical_packages = os::active_processor_count() / logical_processors; if (physical_packages >= server_processors) { result = true; } } else { result = true; } } return result; } void os::initialize_initial_active_processor_count() { assert(_initial_active_processor_count == 0, "Initial active processor count alread _initial_active_processor_count = active_processor_count(); log_debug(os)("Initial active processor count set to %d" , _initial_active_process } bool os::create_stack_guard_pages(char* addr, size_t bytes) { return os::pd_create_stack_guard_pages(addr, bytes); } char* os::reserve_memory(size_t bytes, bool executable, MEMFLAGS flags) { char* result = pd_reserve_memory(bytes, executable); if (result != NULL) { MemTracker::record_virtual_memory_reserve(result, bytes, CALLER_PC, flags); } return result; } char* os::attempt_reserve_memory_at(char* addr, size_t bytes, bool executable) { char* result = pd_attempt_reserve_memory_at(addr, bytes, executable); if (result != NULL) { MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); } else { log_debug(os)("Attempt to reserve memory at " INTPTR_FORMAT " for " SIZE_FORMAT " bytes failed, errno %d", p2i(addr), bytes, get_last_error()); } return result; } static void assert_nonempty_range(const char* addr, size_t bytes) { assert(addr != nullptr && bytes > 0, "invalid range [" PTR_FORMAT ", " PTR_FORMAT ")", p2i(addr), p2i(addr) + bytes); } bool os::commit_memory(char* addr, size_t bytes, bool executable) { assert_nonempty_range(addr, bytes); bool res = pd_commit_memory(addr, bytes, executable); if (res) { MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); } return res; } bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, bool executable) { assert_nonempty_range(addr, size); bool res = os::pd_commit_memory(addr, size, alignment_hint, executable); if (res) { MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); } return res; } void os::commit_memory_or_exit(char* addr, size_t bytes, bool executable, const char* mesg) { assert_nonempty_range(addr, bytes); pd_commit_memory_or_exit(addr, bytes, executable, mesg); MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); } void os::commit_memory_or_exit(char* addr, size_t size, size_t alignment_hint, bool executable, const char* mesg) { assert_nonempty_range(addr, size); os::pd_commit_memory_or_exit(addr, size, alignment_hint, executable, mesg); MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); } bool os::uncommit_memory(char* addr, size_t bytes, bool executable) { assert_nonempty_range(addr, bytes); bool res; if (MemTracker::enabled()) { Tracker tkr(Tracker::uncommit); res = pd_uncommit_memory(addr, bytes, executable); if (res) { tkr.record((address)addr, bytes); } } else { res = pd_uncommit_memory(addr, bytes, executable); } return res; } bool os::release_memory(char* addr, size_t bytes) { assert_nonempty_range(addr, bytes); bool res; if (MemTracker::enabled()) { // Note: Tracker contains a ThreadCritical. Tracker tkr(Tracker::release); res = pd_release_memory(addr, bytes); if (res) { tkr.record((address)addr, bytes); } } else { res = pd_release_memory(addr, bytes); } if (!res) { log_info(os)("os::release_memory failed (" PTR_FORMAT ", " SIZE_FORMAT ")", p2i(addr) } return res; } // Prints all mappings void os::print_memory_mappings(outputStream* st) { os::print_memory_mappings(nullptr, (size_t)-1, st); } // Pretouching must use a store, not just a load. On many OSes loads from // fresh memory would be satisfied from a single mapped page containing all // zeros. We need to store something to each page to get them backed by // their own memory, which is the effect we want here. An atomic add of // zero is used instead of a simple store, allowing the memory to be used // while pretouch is in progress, rather than requiring users of the memory // to wait until the entire range has been touched. This is technically // a UB data race, but doesn't cause any problems for us. void os::pretouch_memory(void* start, void* end, size_t page_size) { assert(start <= end, "invalid range: " PTR_FORMAT " -> " PTR_FORMAT, p2i(start), p2i(end) assert(is_power_of_2(page_size), "page size misaligned: %zu", page_size); assert(page_size >= sizeof(int), "page size too small: %zu", page_size); if (start < end) { // We're doing concurrent-safe touch and memory state has page // granularity, so we can touch anywhere in a page. Touch at the // beginning of each page to simplify iteration. char* cur = static_cast<char*>(align_down(start, page_size)); void* last = align_down(static_cast<char*>(end) - 1, page_size); assert(cur <= last, "invariant"); // Iterate from first page through last (inclusive), being careful to // avoid overflow if the last page abuts the end of the address range. for ( ; true; cur += page_size) { Atomic::add(reinterpret_cast<int*>(cur), 0, memory_order_relaxed); if (cur >= last) break; } } } char* os::map_memory_to_file(size_t bytes, int file_desc) { // Could have called pd_reserve_memory() followed by replace_existing_mapping_with_file // but AIX may use SHM in which case its more trouble to detach the segment and remap memory to the f // On all current implementations NULL is interpreted as any available address. char* result = os::map_memory_to_file(NULL /* addr */, bytes, file_desc); if (result != NULL) { MemTracker::record_virtual_memory_reserve_and_commit(result, bytes, CALLER_PC); } return result; } char* os::attempt_map_memory_to_file_at(char* addr, size_t bytes, int file_desc) { char* result = pd_attempt_map_memory_to_file_at(addr, bytes, file_desc); if (result != NULL) { MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, CALLE } return result; } char* os::map_memory(int fd, const char* file_name, size_t file_offset, char *addr, size_t bytes, bool read_only, --> -------------------- --> maximum size reached --> -------------------- ¤ Dauer der Verarbeitung: 0.89 Sekunden (vorverarbeitet) ¤ |
Haftungshinweis
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:Die farbliche Syntaxdarstellung ist noch experimentell.Bot Zugriff |
