graal-jvmci-8: src/os/windows/vm/os

comparison src/os/windows/vm/os_windows.cpp @ 0:a61af66fc99e jdk7-b24

Initial load

author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
parents
children	e195fe4c40c7 5a76ab815e34

comparison

equal deleted inserted replaced

--1:000000000000
+:a61af66fc99e
+/*
+* Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+* CA 95054 USA or visit www.sun.com if you need additional information or
+* have any questions.
+*
+*/
+#ifdef _WIN64
+// Must be at least Windows 2000 or XP to use VectoredExceptions
+#define _WIN32_WINNT 0x500
+#endif
+// do not include precompiled header file
+# include "incls/_os_windows.cpp.incl"
+#ifdef _DEBUG
+#include <crtdbg.h>
+#endif
+#include <windows.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/timeb.h>
+#include <objidl.h>
+#include <shlobj.h>
+#include <malloc.h>
+#include <signal.h>
+#include <direct.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <io.h>
+#include <process.h>              // For _beginthreadex(), _endthreadex()
+#include <imagehlp.h>             // For os::dll_address_to_function_name
+/* for enumerating dll libraries */
+#include <tlhelp32.h>
+#include <vdmdbg.h>
+// for timer info max values which include all bits
+#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
+// For DLL loading/load error detection
+// Values of PE COFF
+#define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
+#define IMAGE_FILE_SIGNATURE_LENGTH 4
+static HANDLE main_process;
+static HANDLE main_thread;
+static int    main_thread_id;
+static FILETIME process_creation_time;
+static FILETIME process_exit_time;
+static FILETIME process_user_time;
+static FILETIME process_kernel_time;
+#ifdef _WIN64
+PVOID  topLevelVectoredExceptionHandler = NULL;
+#endif
+#ifdef _M_IA64
+#define __CPU__ ia64
+#elif _M_AMD64
+#define __CPU__ amd64
+#else
+#define __CPU__ i486
+#endif
+// save DLL module handle, used by GetModuleFileName
+HINSTANCE vm_lib_handle;
+static int getLastErrorString(char *buf, size_t len);
+BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
+switch (reason) {
+case DLL_PROCESS_ATTACH:
+vm_lib_handle = hinst;
+if(ForceTimeHighResolution)
+timeBeginPeriod(1L);
+break;
+case DLL_PROCESS_DETACH:
+if(ForceTimeHighResolution)
+timeEndPeriod(1L);
+#ifdef _WIN64
+if (topLevelVectoredExceptionHandler != NULL) {
+RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
+topLevelVectoredExceptionHandler = NULL;
+}
+#endif
+break;
+default:
+break;
+}
+return true;
+}
+static inline double fileTimeAsDouble(FILETIME* time) {
+const double high  = (double) ((unsigned int) ~0);
+const double split = 10000000.0;
+double result = (time->dwLowDateTime / split) +
+time->dwHighDateTime * (high/split);
+return result;
+}
+// Implementation of os
+bool os::getenv(const char* name, char* buffer, int len) {
+int result = GetEnvironmentVariable(name, buffer, len);
+return result > 0 && result < len;
+}
+// No setuid programs under Windows.
+bool os::have_special_privileges() {
+return false;
+}
+// This method is  a periodic task to check for misbehaving JNI applications
+// under CheckJNI, we can add any periodic checks here.
+// For Windows at the moment does nothing
+void os::run_periodic_checks() {
+return;
+}
+#ifndef _WIN64
+LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
+#endif
+void os::init_system_properties_values() {
+/* sysclasspath, java_home, dll_dir */
+{
+char *home_path;
+char *dll_path;
+char *pslash;
+char *bin = "\\bin";
+char home_dir[MAX_PATH];
+if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
+os::jvm_path(home_dir, sizeof(home_dir));
+// Found the full path to jvm[_g].dll.
+// Now cut the path to <java_home>/jre if we can.
+*(strrchr(home_dir, '\\')) = '\0';  /* get rid of \jvm.dll */
+pslash = strrchr(home_dir, '\\');
+if (pslash != NULL) {
+*pslash = '\0';                 /* get rid of \{client|server} */
+pslash = strrchr(home_dir, '\\');
+if (pslash != NULL)
+*pslash = '\0';             /* get rid of \bin */
+}
+}
+home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1);
+if (home_path == NULL)
+return;
+strcpy(home_path, home_dir);
+Arguments::set_java_home(home_path);
+dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1);
+if (dll_path == NULL)
+return;
+strcpy(dll_path, home_dir);
+strcat(dll_path, bin);
+Arguments::set_dll_dir(dll_path);
+if (!set_boot_path('\\', ';'))
+return;
+}
+/* library_path */
+#define EXT_DIR "\\lib\\ext"
+#define BIN_DIR "\\bin"
+#define PACKAGE_DIR "\\Sun\\Java"
+{
+/* Win32 library search order (See the documentation for LoadLibrary):
+*
+* 1. The directory from which application is loaded.
+* 2. The current directory
+* 3. The system wide Java Extensions directory (Java only)
+* 4. System directory (GetSystemDirectory)
+* 5. Windows directory (GetWindowsDirectory)
+* 6. The PATH environment variable
+*/
+char *library_path;
+char tmp[MAX_PATH];
+char *path_str = ::getenv("PATH");
+library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
+sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10);
+library_path[0] = '\0';
+GetModuleFileName(NULL, tmp, sizeof(tmp));
+*(strrchr(tmp, '\\')) = '\0';
+strcat(library_path, tmp);
+strcat(library_path, ";.");
+GetWindowsDirectory(tmp, sizeof(tmp));
+strcat(library_path, ";");
+strcat(library_path, tmp);
+strcat(library_path, PACKAGE_DIR BIN_DIR);
+GetSystemDirectory(tmp, sizeof(tmp));
+strcat(library_path, ";");
+strcat(library_path, tmp);
+GetWindowsDirectory(tmp, sizeof(tmp));
+strcat(library_path, ";");
+strcat(library_path, tmp);
+if (path_str) {
+strcat(library_path, ";");
+strcat(library_path, path_str);
+}
+Arguments::set_library_path(library_path);
+FREE_C_HEAP_ARRAY(char, library_path);
+}
+/* Default extensions directory */
+{
+char path[MAX_PATH];
+char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
+GetWindowsDirectory(path, MAX_PATH);
+sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
+path, PACKAGE_DIR, EXT_DIR);
+Arguments::set_ext_dirs(buf);
+}
+#undef EXT_DIR
+#undef BIN_DIR
+#undef PACKAGE_DIR
+/* Default endorsed standards directory. */
+{
+#define ENDORSED_DIR "\\lib\\endorsed"
+size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
+char * buf = NEW_C_HEAP_ARRAY(char, len);
+sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
+Arguments::set_endorsed_dirs(buf);
+#undef ENDORSED_DIR
+}
+#ifndef _WIN64
+SetUnhandledExceptionFilter(Handle_FLT_Exception);
+#endif
+// Done
+return;
+}
+void os::breakpoint() {
+DebugBreak();
+}
+// Invoked from the BREAKPOINT Macro
+extern "C" void breakpoint() {
+os::breakpoint();
+}
+// Returns an estimate of the current stack pointer. Result must be guaranteed
+// to point into the calling threads stack, and be no lower than the current
+// stack pointer.
+address os::current_stack_pointer() {
+int dummy;
+address sp = (address)&dummy;
+return sp;
+}
+// os::current_stack_base()
+//
+//   Returns the base of the stack, which is the stack's
+//   starting address.  This function must be called
+//   while running on the stack of the thread being queried.
+address os::current_stack_base() {
+MEMORY_BASIC_INFORMATION minfo;
+address stack_bottom;
+size_t stack_size;
+VirtualQuery(&minfo, &minfo, sizeof(minfo));
+stack_bottom =  (address)minfo.AllocationBase;
+stack_size = minfo.RegionSize;
+// Add up the sizes of all the regions with the same
+// AllocationBase.
+while( 1 )
+{
+VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
+if ( stack_bottom == (address)minfo.AllocationBase )
+stack_size += minfo.RegionSize;
+else
+break;
+}
+#ifdef _M_IA64
+// IA64 has memory and register stacks
+stack_size = stack_size / 2;
+#endif
+return stack_bottom + stack_size;
+}
+size_t os::current_stack_size() {
+size_t sz;
+MEMORY_BASIC_INFORMATION minfo;
+VirtualQuery(&minfo, &minfo, sizeof(minfo));
+sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
+return sz;
+}
+LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
+// Thread start routine for all new Java threads
+static unsigned __stdcall java_start(Thread* thread) {
+// Try to randomize the cache line index of hot stack frames.
+// This helps when threads of the same stack traces evict each other's
+// cache lines. The threads can be either from the same JVM instance, or
+// from different JVM instances. The benefit is especially true for
+// processors with hyperthreading technology.
+static int counter = 0;
+int pid = os::current_process_id();
+_alloca(((pid ^ counter++) & 7) * 128);
+OSThread* osthr = thread->osthread();
+assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
+if (UseNUMA) {
+int lgrp_id = os::numa_get_group_id();
+if (lgrp_id != -1) {
+thread->set_lgrp_id(lgrp_id);
+}
+}
+if (UseVectoredExceptions) {
+// If we are using vectored exception we don't need to set a SEH
+thread->run();
+}
+else {
+// Install a win32 structured exception handler around every thread created
+// by VM, so VM can genrate error dump when an exception occurred in non-
+// Java thread (e.g. VM thread).
+__try {
+thread->run();
+} __except(topLevelExceptionFilter(
+(_EXCEPTION_POINTERS*)_exception_info())) {
+// Nothing to do.
+}
+}
+// One less thread is executing
+// When the VMThread gets here, the main thread may have already exited
+// which frees the CodeHeap containing the Atomic::add code
+if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
+Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
+}
+return 0;
+}
+static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
+// Allocate the OSThread object
+OSThread* osthread = new OSThread(NULL, NULL);
+if (osthread == NULL) return NULL;
+// Initialize support for Java interrupts
+HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
+if (interrupt_event == NULL) {
+delete osthread;
+return NULL;
+}
+osthread->set_interrupt_event(interrupt_event);
+// Store info on the Win32 thread into the OSThread
+osthread->set_thread_handle(thread_handle);
+osthread->set_thread_id(thread_id);
+if (UseNUMA) {
+int lgrp_id = os::numa_get_group_id();
+if (lgrp_id != -1) {
+thread->set_lgrp_id(lgrp_id);
+}
+}
+// Initial thread state is INITIALIZED, not SUSPENDED
+osthread->set_state(INITIALIZED);
+return osthread;
+}
+bool os::create_attached_thread(JavaThread* thread) {
+#ifdef ASSERT
+thread->verify_not_published();
+#endif
+HANDLE thread_h;
+if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
+&thread_h, THREAD_ALL_ACCESS, false, 0)) {
+fatal("DuplicateHandle failed\n");
+}
+OSThread* osthread = create_os_thread(thread, thread_h,
+(int)current_thread_id());
+if (osthread == NULL) {
+return false;
+}
+// Initial thread state is RUNNABLE
+osthread->set_state(RUNNABLE);
+thread->set_osthread(osthread);
+return true;
+}
+bool os::create_main_thread(JavaThread* thread) {
+#ifdef ASSERT
+thread->verify_not_published();
+#endif
+if (_starting_thread == NULL) {
+_starting_thread = create_os_thread(thread, main_thread, main_thread_id);
+if (_starting_thread == NULL) {
+return false;
+}
+}
+// The primordial thread is runnable from the start)
+_starting_thread->set_state(RUNNABLE);
+thread->set_osthread(_starting_thread);
+return true;
+}
+// Allocate and initialize a new OSThread
+bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
+unsigned thread_id;
+// Allocate the OSThread object
+OSThread* osthread = new OSThread(NULL, NULL);
+if (osthread == NULL) {
+return false;
+}
+// Initialize support for Java interrupts
+HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
+if (interrupt_event == NULL) {
+delete osthread;
+return NULL;
+}
+osthread->set_interrupt_event(interrupt_event);
+osthread->set_interrupted(false);
+thread->set_osthread(osthread);
+if (stack_size == 0) {
+switch (thr_type) {
+case os::java_thread:
+// Java threads use ThreadStackSize which default value can be changed with the flag -Xss
+if (JavaThread::stack_size_at_create() > 0)
+stack_size = JavaThread::stack_size_at_create();
+break;
+case os::compiler_thread:
+if (CompilerThreadStackSize > 0) {
+stack_size = (size_t)(CompilerThreadStackSize * K);
+break;
+} // else fall through:
+// use VMThreadStackSize if CompilerThreadStackSize is not defined
+case os::vm_thread:
+case os::pgc_thread:
+case os::cgc_thread:
+case os::watcher_thread:
+if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
+break;
+}
+}
+// Create the Win32 thread
+//
+// Contrary to what MSDN document says, "stack_size" in _beginthreadex()
+// does not specify stack size. Instead, it specifies the size of
+// initially committed space. The stack size is determined by
+// PE header in the executable. If the committed "stack_size" is larger
+// than default value in the PE header, the stack is rounded up to the
+// nearest multiple of 1MB. For example if the launcher has default
+// stack size of 320k, specifying any size less than 320k does not
+// affect the actual stack size at all, it only affects the initial
+// commitment. On the other hand, specifying 'stack_size' larger than
+// default value may cause significant increase in memory usage, because
+// not only the stack space will be rounded up to MB, but also the
+// entire space is committed upfront.
+//
+// Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
+// for CreateThread() that can treat 'stack_size' as stack size. However we
+// are not supposed to call CreateThread() directly according to MSDN
+// document because JVM uses C runtime library. The good news is that the
+// flag appears to work with _beginthredex() as well.
+#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
+#define STACK_SIZE_PARAM_IS_A_RESERVATION  (0x10000)
+#endif
+HANDLE thread_handle =
+(HANDLE)_beginthreadex(NULL,
+(unsigned)stack_size,
+(unsigned (__stdcall *)(void*)) java_start,
+thread,
+CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
+&thread_id);
+if (thread_handle == NULL) {
+// perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
+// without the flag.
+thread_handle =
+(HANDLE)_beginthreadex(NULL,
+(unsigned)stack_size,
+(unsigned (__stdcall *)(void*)) java_start,
+thread,
+CREATE_SUSPENDED,
+&thread_id);
+}
+if (thread_handle == NULL) {
+// Need to clean up stuff we've allocated so far
+CloseHandle(osthread->interrupt_event());
+thread->set_osthread(NULL);
+delete osthread;
+return NULL;
+}
+Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
+// Store info on the Win32 thread into the OSThread
+osthread->set_thread_handle(thread_handle);
+osthread->set_thread_id(thread_id);
+// Initial thread state is INITIALIZED, not SUSPENDED
+osthread->set_state(INITIALIZED);
+// The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
+return true;
+}
+// Free Win32 resources related to the OSThread
+void os::free_thread(OSThread* osthread) {
+assert(osthread != NULL, "osthread not set");
+CloseHandle(osthread->thread_handle());
+CloseHandle(osthread->interrupt_event());
+delete osthread;
+}
+static int    has_performance_count = 0;
+static jlong first_filetime;
+static jlong initial_performance_count;
+static jlong performance_frequency;
+jlong as_long(LARGE_INTEGER x) {
+jlong result = 0; // initialization to avoid warning
+set_high(&result, x.HighPart);
+set_low(&result,  x.LowPart);
+return result;
+}
+jlong os::elapsed_counter() {
+LARGE_INTEGER count;
+if (has_performance_count) {
+QueryPerformanceCounter(&count);
+return as_long(count) - initial_performance_count;
+} else {
+FILETIME wt;
+GetSystemTimeAsFileTime(&wt);
+return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
+}
+}
+jlong os::elapsed_frequency() {
+if (has_performance_count) {
+return performance_frequency;
+} else {
+// the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
+return 10000000;
+}
+}
+julong os::available_memory() {
+return win32::available_memory();
+}
+julong os::win32::available_memory() {
+// FIXME: GlobalMemoryStatus() may return incorrect value if total memory
+// is larger than 4GB
+MEMORYSTATUS ms;
+GlobalMemoryStatus(&ms);
+return (julong)ms.dwAvailPhys;
+}
+julong os::physical_memory() {
+return win32::physical_memory();
+}
+julong os::allocatable_physical_memory(julong size) {
+return MIN2(size, (julong)1400*M);
+}
+// VC6 lacks DWORD_PTR
+#if _MSC_VER < 1300
+typedef UINT_PTR DWORD_PTR;
+#endif
+int os::active_processor_count() {
+DWORD_PTR lpProcessAffinityMask = 0;
+DWORD_PTR lpSystemAffinityMask = 0;
+int proc_count = processor_count();
+if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
+GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
+// Nof active processors is number of bits in process affinity mask
+int bitcount = 0;
+while (lpProcessAffinityMask != 0) {
+lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
+bitcount++;
+}
+return bitcount;
+} else {
+return proc_count;
+}
+}
+bool os::distribute_processes(uint length, uint* distribution) {
+// Not yet implemented.
+return false;
+}
+bool os::bind_to_processor(uint processor_id) {
+// Not yet implemented.
+return false;
+}
+static void initialize_performance_counter() {
+LARGE_INTEGER count;
+if (QueryPerformanceFrequency(&count)) {
+has_performance_count = 1;
+performance_frequency = as_long(count);
+QueryPerformanceCounter(&count);
+initial_performance_count = as_long(count);
+} else {
+has_performance_count = 0;
+FILETIME wt;
+GetSystemTimeAsFileTime(&wt);
+first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
+}
+}
+double os::elapsedTime() {
+return (double) elapsed_counter() / (double) elapsed_frequency();
+}
+// Windows format:
+//   The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
+// Java format:
+//   Java standards require the number of milliseconds since 1/1/1970
+// Constant offset - calculated using offset()
+static jlong  _offset   = 116444736000000000;
+// Fake time counter for reproducible results when debugging
+static jlong  fake_time = 0;
+#ifdef ASSERT
+// Just to be safe, recalculate the offset in debug mode
+static jlong _calculated_offset = 0;
+static int   _has_calculated_offset = 0;
+jlong offset() {
+if (_has_calculated_offset) return _calculated_offset;
+SYSTEMTIME java_origin;
+java_origin.wYear          = 1970;
+java_origin.wMonth         = 1;
+java_origin.wDayOfWeek     = 0; // ignored
+java_origin.wDay           = 1;
+java_origin.wHour          = 0;
+java_origin.wMinute        = 0;
+java_origin.wSecond        = 0;
+java_origin.wMilliseconds  = 0;
+FILETIME jot;
+if (!SystemTimeToFileTime(&java_origin, &jot)) {
+fatal1("Error = %d\nWindows error", GetLastError());
+}
+_calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
+_has_calculated_offset = 1;
+assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
+return _calculated_offset;
+}
+#else
+jlong offset() {
+return _offset;
+}
+#endif
+jlong windows_to_java_time(FILETIME wt) {
+jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
+return (a - offset()) / 10000;
+}
+FILETIME java_to_windows_time(jlong l) {
+jlong a = (l * 10000) + offset();
+FILETIME result;
+result.dwHighDateTime = high(a);
+result.dwLowDateTime  = low(a);
+return result;
+}
+jlong os::timeofday() {
+FILETIME wt;
+GetSystemTimeAsFileTime(&wt);
+return windows_to_java_time(wt);
+}
+// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
+// _use_global_time is only set if CacheTimeMillis is true
+jlong os::javaTimeMillis() {
+if (UseFakeTimers) {
+return fake_time++;
+} else {
+return (_use_global_time ? read_global_time() : timeofday());
+}
+}
+#define NANOS_PER_SEC         CONST64(1000000000)
+#define NANOS_PER_MILLISEC    1000000
+jlong os::javaTimeNanos() {
+if (!has_performance_count) {
+return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do.
+} else {
+LARGE_INTEGER current_count;
+QueryPerformanceCounter(&current_count);
+double current = as_long(current_count);
+double freq = performance_frequency;
+jlong time = (jlong)((current/freq) * NANOS_PER_SEC);
+return time;
+}
+}
+void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
+if (!has_performance_count) {
+// javaTimeMillis() doesn't have much percision,
+// but it is not going to wrap -- so all 64 bits
+info_ptr->max_value = ALL_64_BITS;
+// this is a wall clock timer, so may skip
+info_ptr->may_skip_backward = true;
+info_ptr->may_skip_forward = true;
+} else {
+jlong freq = performance_frequency;
+if (freq < NANOS_PER_SEC) {
+// the performance counter is 64 bits and we will
+// be multiplying it -- so no wrap in 64 bits
+info_ptr->max_value = ALL_64_BITS;
+} else if (freq > NANOS_PER_SEC) {
+// use the max value the counter can reach to
+// determine the max value which could be returned
+julong max_counter = (julong)ALL_64_BITS;
+info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC));
+} else {
+// the performance counter is 64 bits and we will
+// be using it directly -- so no wrap in 64 bits
+info_ptr->max_value = ALL_64_BITS;
+}
+// using a counter, so no skipping
+info_ptr->may_skip_backward = false;
+info_ptr->may_skip_forward = false;
+}
+info_ptr->kind = JVMTI_TIMER_ELAPSED;                // elapsed not CPU time
+}
+char* os::local_time_string(char *buf, size_t buflen) {
+SYSTEMTIME st;
+GetLocalTime(&st);
+jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
+st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
+return buf;
+}
+bool os::getTimesSecs(double* process_real_time,
+double* process_user_time,
+double* process_system_time) {
+HANDLE h_process = GetCurrentProcess();
+FILETIME create_time, exit_time, kernel_time, user_time;
+BOOL result = GetProcessTimes(h_process,
+&create_time,
+&exit_time,
+&kernel_time,
+&user_time);
+if (result != 0) {
+FILETIME wt;
+GetSystemTimeAsFileTime(&wt);
+jlong rtc_millis = windows_to_java_time(wt);
+jlong user_millis = windows_to_java_time(user_time);
+jlong system_millis = windows_to_java_time(kernel_time);
+*process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
+*process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
+*process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
+return true;
+} else {
+return false;
+}
+}
+void os::shutdown() {
+// allow PerfMemory to attempt cleanup of any persistent resources
+perfMemory_exit();
+// flush buffered output, finish log files
+ostream_abort();
+// Check for abort hook
+abort_hook_t abort_hook = Arguments::abort_hook();
+if (abort_hook != NULL) {
+abort_hook();
+}
+}
+void os::abort(bool dump_core)
+{
+os::shutdown();
+// no core dump on Windows
+::exit(1);
+}
+// Die immediately, no exit hook, no abort hook, no cleanup.
+void os::die() {
+_exit(-1);
+}
+// Directory routines copied from src/win32/native/java/io/dirent_md.c
+//  * dirent_md.c       1.15 00/02/02
+//
+// The declarations for DIR and struct dirent are in jvm_win32.h.
+/* Caller must have already run dirname through JVM_NativePath, which removes
+duplicate slashes and converts all instances of '/' into '\\'. */
+DIR *
+os::opendir(const char *dirname)
+{
+assert(dirname != NULL, "just checking");   // hotspot change
+DIR *dirp = (DIR *)malloc(sizeof(DIR));
+DWORD fattr;                                // hotspot change
+char alt_dirname[4] = { 0, 0, 0, 0 };
+if (dirp == 0) {
+errno = ENOMEM;
+return 0;
+}
+/*
+* Win32 accepts "\" in its POSIX stat(), but refuses to treat it
+* as a directory in FindFirstFile().  We detect this case here and
+* prepend the current drive name.
+*/
+if (dirname[1] == '\0' && dirname[0] == '\\') {
+alt_dirname[0] = _getdrive() + 'A' - 1;
+alt_dirname[1] = ':';
+alt_dirname[2] = '\\';
+alt_dirname[3] = '\0';
+dirname = alt_dirname;
+}
+dirp->path = (char *)malloc(strlen(dirname) + 5);
+if (dirp->path == 0) {
+free(dirp);
+errno = ENOMEM;
+return 0;
+}
+strcpy(dirp->path, dirname);
+fattr = GetFileAttributes(dirp->path);
+if (fattr == 0xffffffff) {
+free(dirp->path);
+free(dirp);
+errno = ENOENT;
+return 0;
+} else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
+free(dirp->path);
+free(dirp);
+errno = ENOTDIR;
+return 0;
+}
+/* Append "*.*", or possibly "\\*.*", to path */
+if (dirp->path[1] == ':'
+&& (dirp->path[2] == '\0'
+|| (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
+/* No '\\' needed for cases like "Z:" or "Z:\" */
+strcat(dirp->path, "*.*");
+} else {
+strcat(dirp->path, "\\*.*");
+}
+dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
+if (dirp->handle == INVALID_HANDLE_VALUE) {
+if (GetLastError() != ERROR_FILE_NOT_FOUND) {
+free(dirp->path);
+free(dirp);
+errno = EACCES;
+return 0;
+}
+}
+return dirp;
+}
+/* parameter dbuf unused on Windows */
+struct dirent *
+os::readdir(DIR *dirp, dirent *dbuf)
+{
+assert(dirp != NULL, "just checking");      // hotspot change
+if (dirp->handle == INVALID_HANDLE_VALUE) {
+return 0;
+}
+strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
+if (!FindNextFile(dirp->handle, &dirp->find_data)) {
+if (GetLastError() == ERROR_INVALID_HANDLE) {
+errno = EBADF;
+return 0;
+}
+FindClose(dirp->handle);
+dirp->handle = INVALID_HANDLE_VALUE;
+}
+return &dirp->dirent;
+}
+int
+os::closedir(DIR *dirp)
+{
+assert(dirp != NULL, "just checking");      // hotspot change
+if (dirp->handle != INVALID_HANDLE_VALUE) {
+if (!FindClose(dirp->handle)) {
+errno = EBADF;
+return -1;
+}
+dirp->handle = INVALID_HANDLE_VALUE;
+}
+free(dirp->path);
+free(dirp);
+return 0;
+}
+const char* os::dll_file_extension() { return ".dll"; }
+const char * os::get_temp_directory()
+{
+static char path_buf[MAX_PATH];
+if (GetTempPath(MAX_PATH, path_buf)>0)
+return path_buf;
+else{
+path_buf[0]='\0';
+return path_buf;
+}
+}
+// Needs to be in os specific directory because windows requires another
+// header file <direct.h>
+const char* os::get_current_directory(char *buf, int buflen) {
+return _getcwd(buf, buflen);
+}
+//-----------------------------------------------------------
+// Helper functions for fatal error handler
+// The following library functions are resolved dynamically at runtime:
+// PSAPI functions, for Windows NT, 2000, XP
+// psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
+// SDK from Microsoft.  Here are the definitions copied from psapi.h
+typedef struct _MODULEINFO {
+LPVOID lpBaseOfDll;
+DWORD SizeOfImage;
+LPVOID EntryPoint;
+} MODULEINFO, *LPMODULEINFO;
+static BOOL  (WINAPI *_EnumProcessModules)  ( HANDLE, HMODULE *, DWORD, LPDWORD );
+static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
+static BOOL  (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
+// ToolHelp Functions, for Windows 95, 98 and ME
+static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
+static BOOL  (WINAPI *_Module32First)           (HANDLE,LPMODULEENTRY32) ;
+static BOOL  (WINAPI *_Module32Next)            (HANDLE,LPMODULEENTRY32) ;
+bool _has_psapi;
+bool _psapi_init = false;
+bool _has_toolhelp;
+static bool _init_psapi() {
+HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
+if( psapi == NULL ) return false ;
+_EnumProcessModules = CAST_TO_FN_PTR(
+BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
+GetProcAddress(psapi, "EnumProcessModules")) ;
+_GetModuleFileNameEx = CAST_TO_FN_PTR(
+DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
+GetProcAddress(psapi, "GetModuleFileNameExA"));
+_GetModuleInformation = CAST_TO_FN_PTR(
+BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
+GetProcAddress(psapi, "GetModuleInformation"));
+_has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
+_psapi_init = true;
+return _has_psapi;
+}
+static bool _init_toolhelp() {
+HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
+if (kernel32 == NULL) return false ;
+_CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
+HANDLE(WINAPI *)(DWORD,DWORD),
+GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
+_Module32First = CAST_TO_FN_PTR(
+BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
+GetProcAddress(kernel32, "Module32First" ));
+_Module32Next = CAST_TO_FN_PTR(
+BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
+GetProcAddress(kernel32, "Module32Next" ));
+_has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
+return _has_toolhelp;
+}
+#ifdef _WIN64
+// Helper routine which returns true if address in
+// within the NTDLL address space.
+//
+static bool _addr_in_ntdll( address addr )
+{
+HMODULE hmod;
+MODULEINFO minfo;
+hmod = GetModuleHandle("NTDLL.DLL");
+if ( hmod == NULL ) return false;
+if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
+&minfo, sizeof(MODULEINFO)) )
+return false;
+if ( (addr >= minfo.lpBaseOfDll) &&
+(addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
+return true;
+else
+return false;
+}
+#endif
+// Enumerate all modules for a given process ID
+//
+// Notice that Windows 95/98/Me and Windows NT/2000/XP have
+// different API for doing this. We use PSAPI.DLL on NT based
+// Windows and ToolHelp on 95/98/Me.
+// Callback function that is called by enumerate_modules() on
+// every DLL module.
+// Input parameters:
+//    int       pid,
+//    char*     module_file_name,
+//    address   module_base_addr,
+//    unsigned  module_size,
+//    void*     param
+typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
+// enumerate_modules for Windows NT, using PSAPI
+static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
+{
+HANDLE   hProcess ;
+# define MAX_NUM_MODULES 128
+HMODULE     modules[MAX_NUM_MODULES];
+static char filename[ MAX_PATH ];
+int         result = 0;
+if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
+hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
+FALSE, pid ) ;
+if (hProcess == NULL) return 0;
+DWORD size_needed;
+if (!_EnumProcessModules(hProcess, modules,
+sizeof(modules), &size_needed)) {
+CloseHandle( hProcess );
+return 0;
+}
+// number of modules that are currently loaded
+int num_modules = size_needed / sizeof(HMODULE);
+for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
+// Get Full pathname:
+if(!_GetModuleFileNameEx(hProcess, modules[i],
+filename, sizeof(filename))) {
+filename[0] = '\0';
+}
+MODULEINFO modinfo;
+if (!_GetModuleInformation(hProcess, modules[i],
+&modinfo, sizeof(modinfo))) {
+modinfo.lpBaseOfDll = NULL;
+modinfo.SizeOfImage = 0;
+}
+// Invoke callback function
+result = func(pid, filename, (address)modinfo.lpBaseOfDll,
+modinfo.SizeOfImage, param);
+if (result) break;
+}
+CloseHandle( hProcess ) ;
+return result;
+}
+// enumerate_modules for Windows 95/98/ME, using TOOLHELP
+static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
+{
+HANDLE                hSnapShot ;
+static MODULEENTRY32  modentry ;
+int                   result = 0;
+if (!_has_toolhelp) return 0;
+// Get a handle to a Toolhelp snapshot of the system
+hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
+if( hSnapShot == INVALID_HANDLE_VALUE ) {
+return FALSE ;
+}
+// iterate through all modules
+modentry.dwSize = sizeof(MODULEENTRY32) ;
+bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
+while( not_done ) {
+// invoke the callback
+result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
+modentry.modBaseSize, param);
+if (result) break;
+modentry.dwSize = sizeof(MODULEENTRY32) ;
+not_done = _Module32Next( hSnapShot, &modentry ) != 0;
+}
+CloseHandle(hSnapShot);
+return result;
+}
+int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
+{
+// Get current process ID if caller doesn't provide it.
+if (!pid) pid = os::current_process_id();
+if (os::win32::is_nt()) return _enumerate_modules_winnt  (pid, func, param);
+else                    return _enumerate_modules_windows(pid, func, param);
+}
+struct _modinfo {
+address addr;
+char*   full_path;   // point to a char buffer
+int     buflen;      // size of the buffer
+address base_addr;
+};
+static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
+unsigned size, void * param) {
+struct _modinfo *pmod = (struct _modinfo *)param;
+if (!pmod) return -1;
+if (base_addr     <= pmod->addr &&
+base_addr+size > pmod->addr) {
+// if a buffer is provided, copy path name to the buffer
+if (pmod->full_path) {
+jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
+}
+pmod->base_addr = base_addr;
+return 1;
+}
+return 0;
+}
+bool os::dll_address_to_library_name(address addr, char* buf,
+int buflen, int* offset) {
+// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
+//       return the full path to the DLL file, sometimes it returns path
+//       to the corresponding PDB file (debug info); sometimes it only
+//       returns partial path, which makes life painful.
+struct _modinfo mi;
+mi.addr      = addr;
+mi.full_path = buf;
+mi.buflen    = buflen;
+int pid = os::current_process_id();
+if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
+// buf already contains path name
+if (offset) *offset = addr - mi.base_addr;
+return true;
+} else {
+if (buf) buf[0] = '\0';
+if (offset) *offset = -1;
+return false;
+}
+}
+bool os::dll_address_to_function_name(address addr, char *buf,
+int buflen, int *offset) {
+// Unimplemented on Windows - in order to use SymGetSymFromAddr(),
+// we need to initialize imagehlp/dbghelp, then load symbol table
+// for every module. That's too much work to do after a fatal error.
+// For an example on how to implement this function, see 1.4.2.
+if (offset)  *offset  = -1;
+if (buf) buf[0] = '\0';
+return false;
+}
+// save the start and end address of jvm.dll into param[0] and param[1]
+static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
+unsigned size, void * param) {
+if (!param) return -1;
+if (base_addr     <= (address)_locate_jvm_dll &&
+base_addr+size > (address)_locate_jvm_dll) {
+((address*)param)[0] = base_addr;
+((address*)param)[1] = base_addr + size;
+return 1;
+}
+return 0;
+}
+address vm_lib_location[2];    // start and end address of jvm.dll
+// check if addr is inside jvm.dll
+bool os::address_is_in_vm(address addr) {
+if (!vm_lib_location[0] || !vm_lib_location[1]) {
+int pid = os::current_process_id();
+if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
+assert(false, "Can't find jvm module.");
+return false;
+}
+}
+return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
+}
+// print module info; param is outputStream*
+static int _print_module(int pid, char* fname, address base,
+unsigned size, void* param) {
+if (!param) return -1;
+outputStream* st = (outputStream*)param;
+address end_addr = base + size;
+st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
+return 0;
+}
+// Loads .dll/.so and
+// in case of error it checks if .dll/.so was built for the
+// same architecture as Hotspot is running on
+void * os::dll_load(const char *name, char *ebuf, int ebuflen)
+{
+void * result = LoadLibrary(name);
+if (result != NULL)
+{
+return result;
+}
+long errcode = GetLastError();
+if (errcode == ERROR_MOD_NOT_FOUND) {
+strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
+ebuf[ebuflen-1]='\0';
+return NULL;
+}
+// Parsing dll below
+// If we can read dll-info and find that dll was built
+// for an architecture other than Hotspot is running in
+// - then print to buffer "DLL was built for a different architecture"
+// else call getLastErrorString to obtain system error message
+// Read system error message into ebuf
+// It may or may not be overwritten below (in the for loop and just above)
+getLastErrorString(ebuf, (size_t) ebuflen);
+ebuf[ebuflen-1]='\0';
+int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
+if (file_descriptor<0)
+{
+return NULL;
+}
+uint32_t signature_offset;
+uint16_t lib_arch=0;
+bool failed_to_get_lib_arch=
+(
+//Go to position 3c in the dll
+(os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
+||
+// Read loacation of signature
+(sizeof(signature_offset)!=
+(os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
+||
+//Go to COFF File Header in dll
+//that is located after"signature" (4 bytes long)
+(os::seek_to_file_offset(file_descriptor,
+signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
+||
+//Read field that contains code of architecture
+// that dll was build for
+(sizeof(lib_arch)!=
+(os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
+);
+::close(file_descriptor);
+if (failed_to_get_lib_arch)
+{
+// file i/o error - report getLastErrorString(...) msg
+return NULL;
+}
+typedef struct
+{
+uint16_t arch_code;
+char* arch_name;
+} arch_t;
+static const arch_t arch_array[]={
+{IMAGE_FILE_MACHINE_I386,      (char*)"IA 32"},
+{IMAGE_FILE_MACHINE_AMD64,     (char*)"AMD 64"},
+{IMAGE_FILE_MACHINE_IA64,      (char*)"IA 64"}
+};
+#if   (defined _M_IA64)
+static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
+#elif (defined _M_AMD64)
+static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
+#elif (defined _M_IX86)
+static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
+#else
+#error Method os::dll_load requires that one of following \
+is defined :_M_IA64,_M_AMD64 or _M_IX86
+#endif
+// Obtain a string for printf operation
+// lib_arch_str shall contain string what platform this .dll was built for
+// running_arch_str shall string contain what platform Hotspot was built for
+char *running_arch_str=NULL,*lib_arch_str=NULL;
+for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
+{
+if (lib_arch==arch_array[i].arch_code)
+lib_arch_str=arch_array[i].arch_name;
+if (running_arch==arch_array[i].arch_code)
+running_arch_str=arch_array[i].arch_name;
+}
+assert(running_arch_str,
+"Didn't find runing architecture code in arch_array");
+// If the architure is right
+// but some other error took place - report getLastErrorString(...) msg
+if (lib_arch == running_arch)
+{
+return NULL;
+}
+if (lib_arch_str!=NULL)
+{
+::_snprintf(ebuf, ebuflen-1,
+"Can't load %s-bit .dll on a %s-bit platform",
+lib_arch_str,running_arch_str);
+}
+else
+{
+// don't know what architecture this dll was build for
+::_snprintf(ebuf, ebuflen-1,
+"Can't load this .dll (machine code=0x%x) on a %s-bit platform",
+lib_arch,running_arch_str);
+}
+return NULL;
+}
+void os::print_dll_info(outputStream *st) {
+int pid = os::current_process_id();
+st->print_cr("Dynamic libraries:");
+enumerate_modules(pid, _print_module, (void *)st);
+}
+void os::print_os_info(outputStream* st) {
+st->print("OS:");
+OSVERSIONINFOEX osvi;
+ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
+osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
+if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
+st->print_cr("N/A");
+return;
+}
+int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
+if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
+switch (os_vers) {
+case 3051: st->print(" Windows NT 3.51"); break;
+case 4000: st->print(" Windows NT 4.0"); break;
+case 5000: st->print(" Windows 2000"); break;
+case 5001: st->print(" Windows XP"); break;
+case 5002: st->print(" Windows Server 2003 family"); break;
+case 6000: st->print(" Windows Vista"); break;
+default: // future windows, print out its major and minor versions
+st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
+}
+} else {
+switch (os_vers) {
+case 4000: st->print(" Windows 95"); break;
+case 4010: st->print(" Windows 98"); break;
+case 4090: st->print(" Windows Me"); break;
+default: // future windows, print out its major and minor versions
+st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
+}
+}
+st->print(" Build %d", osvi.dwBuildNumber);
+st->print(" %s", osvi.szCSDVersion);           // service pack
+st->cr();
+}
+void os::print_memory_info(outputStream* st) {
+st->print("Memory:");
+st->print(" %dk page", os::vm_page_size()>>10);
+// FIXME: GlobalMemoryStatus() may return incorrect value if total memory
+// is larger than 4GB
+MEMORYSTATUS ms;
+GlobalMemoryStatus(&ms);
+st->print(", physical %uk", os::physical_memory() >> 10);
+st->print("(%uk free)", os::available_memory() >> 10);
+st->print(", swap %uk", ms.dwTotalPageFile >> 10);
+st->print("(%uk free)", ms.dwAvailPageFile >> 10);
+st->cr();
+}
+void os::print_siginfo(outputStream *st, void *siginfo) {
+EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
+st->print("siginfo:");
+st->print(" ExceptionCode=0x%x", er->ExceptionCode);
+if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
+er->NumberParameters >= 2) {
+switch (er->ExceptionInformation[0]) {
+case 0: st->print(", reading address"); break;
+case 1: st->print(", writing address"); break;
+default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
+er->ExceptionInformation[0]);
+}
+st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
+} else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
+er->NumberParameters >= 2 && UseSharedSpaces) {
+FileMapInfo* mapinfo = FileMapInfo::current_info();
+if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
+st->print("\n\nError accessing class data sharing archive."       \
+" Mapped file inaccessible during execution, "          \
+" possible disk/network problem.");
+}
+} else {
+int num = er->NumberParameters;
+if (num > 0) {
+st->print(", ExceptionInformation=");
+for (int i = 0; i < num; i++) {
+st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
+}
+}
+}
+st->cr();
+}
+void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
+// do nothing
+}
+static char saved_jvm_path[MAX_PATH] = {0};
+// Find the full path to the current module, jvm.dll or jvm_g.dll
+void os::jvm_path(char *buf, jint buflen) {
+// Error checking.
+if (buflen < MAX_PATH) {
+assert(false, "must use a large-enough buffer");
+buf[0] = '\0';
+return;
+}
+// Lazy resolve the path to current module.
+if (saved_jvm_path[0] != 0) {
+strcpy(buf, saved_jvm_path);
+return;
+}
+GetModuleFileName(vm_lib_handle, buf, buflen);
+strcpy(saved_jvm_path, buf);
+}
+void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
+#ifndef _WIN64
+st->print("_");
+#endif
+}
+void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
+#ifndef _WIN64
+st->print("@%d", args_size  * sizeof(int));
+#endif
+}
+// sun.misc.Signal
+// NOTE that this is a workaround for an apparent kernel bug where if
+// a signal handler for SIGBREAK is installed then that signal handler
+// takes priority over the console control handler for CTRL_CLOSE_EVENT.
+// See bug 4416763.
+static void (*sigbreakHandler)(int) = NULL;
+static void UserHandler(int sig, void *siginfo, void *context) {
+os::signal_notify(sig);
+// We need to reinstate the signal handler each time...
+os::signal(sig, (void*)UserHandler);
+}
+void* os::user_handler() {
+return (void*) UserHandler;
+}
+void* os::signal(int signal_number, void* handler) {
+if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
+void (*oldHandler)(int) = sigbreakHandler;
+sigbreakHandler = (void (*)(int)) handler;
+return (void*) oldHandler;
+} else {
+return (void*)::signal(signal_number, (void (*)(int))handler);
+}
+}
+void os::signal_raise(int signal_number) {
+raise(signal_number);
+}
+// The Win32 C runtime library maps all console control events other than ^C
+// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
+// logoff, and shutdown events.  We therefore install our own console handler
+// that raises SIGTERM for the latter cases.
+//
+static BOOL WINAPI consoleHandler(DWORD event) {
+switch(event) {
+case CTRL_C_EVENT:
+if (is_error_reported()) {
+// Ctrl-C is pressed during error reporting, likely because the error
+// handler fails to abort. Let VM die immediately.
+os::die();
+}
+os::signal_raise(SIGINT);
+return TRUE;
+break;
+case CTRL_BREAK_EVENT:
+if (sigbreakHandler != NULL) {
+(*sigbreakHandler)(SIGBREAK);
+}
+return TRUE;
+break;
+case CTRL_CLOSE_EVENT:
+case CTRL_LOGOFF_EVENT:
+case CTRL_SHUTDOWN_EVENT:
+os::signal_raise(SIGTERM);
+return TRUE;
+break;
+default:
+break;
+}
+return FALSE;
+}
+/*
+* The following code is moved from os.cpp for making this
+* code platform specific, which it is by its very nature.
+*/
+// Return maximum OS signal used + 1 for internal use only
+// Used as exit signal for signal_thread
+int os::sigexitnum_pd(){
+return NSIG;
+}
+// a counter for each possible signal value, including signal_thread exit signal
+static volatile jint pending_signals[NSIG+1] = { 0 };
+static HANDLE sig_sem;
+void os::signal_init_pd() {
+// Initialize signal structures
+memset((void*)pending_signals, 0, sizeof(pending_signals));
+sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
+// Programs embedding the VM do not want it to attempt to receive
+// events like CTRL_LOGOFF_EVENT, which are used to implement the
+// shutdown hooks mechanism introduced in 1.3.  For example, when
+// the VM is run as part of a Windows NT service (i.e., a servlet
+// engine in a web server), the correct behavior is for any console
+// control handler to return FALSE, not TRUE, because the OS's
+// "final" handler for such events allows the process to continue if
+// it is a service (while terminating it if it is not a service).
+// To make this behavior uniform and the mechanism simpler, we
+// completely disable the VM's usage of these console events if -Xrs
+// (=ReduceSignalUsage) is specified.  This means, for example, that
+// the CTRL-BREAK thread dump mechanism is also disabled in this
+// case.  See bugs 4323062, 4345157, and related bugs.
+if (!ReduceSignalUsage) {
+// Add a CTRL-C handler
+SetConsoleCtrlHandler(consoleHandler, TRUE);
+}
+}
+void os::signal_notify(int signal_number) {
+BOOL ret;
+Atomic::inc(&pending_signals[signal_number]);
+ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
+assert(ret != 0, "ReleaseSemaphore() failed");
+}
+static int check_pending_signals(bool wait_for_signal) {
+DWORD ret;
+while (true) {
+for (int i = 0; i < NSIG + 1; i++) {
+jint n = pending_signals[i];
+if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
+return i;
+}
+}
+if (!wait_for_signal) {
+return -1;
+}
+JavaThread *thread = JavaThread::current();
+ThreadBlockInVM tbivm(thread);
+bool threadIsSuspended;
+do {
+thread->set_suspend_equivalent();
+// cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
+ret = ::WaitForSingleObject(sig_sem, INFINITE);
+assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
+// were we externally suspended while we were waiting?
+threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
+if (threadIsSuspended) {
+//
+// The semaphore has been incremented, but while we were waiting
+// another thread suspended us. We don't want to continue running
+// while suspended because that would surprise the thread that
+// suspended us.
+//
+ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
+assert(ret != 0, "ReleaseSemaphore() failed");
+thread->java_suspend_self();
+}
+} while (threadIsSuspended);
+}
+}
+int os::signal_lookup() {
+return check_pending_signals(false);
+}
+int os::signal_wait() {
+return check_pending_signals(true);
+}
+// Implicit OS exception handling
+LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
+JavaThread* thread = JavaThread::current();
+// Save pc in thread
+#ifdef _M_IA64
+thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
+// Set pc to handler
+exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
+#elif _M_AMD64
+thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
+// Set pc to handler
+exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
+#else
+thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
+// Set pc to handler
+exceptionInfo->ContextRecord->Eip = (LONG)handler;
+#endif
+// Continue the execution
+return EXCEPTION_CONTINUE_EXECUTION;
+}
+// Used for PostMortemDump
+extern "C" void safepoints();
+extern "C" void find(int x);
+extern "C" void events();
+// According to Windows API documentation, an illegal instruction sequence should generate
+// the 0xC000001C exception code. However, real world experience shows that occasionnaly
+// the execution of an illegal instruction can generate the exception code 0xC000001E. This
+// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
+#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
+// From "Execution Protection in the Windows Operating System" draft 0.35
+// Once a system header becomes available, the "real" define should be
+// included or copied here.
+#define EXCEPTION_INFO_EXEC_VIOLATION 0x08
+#define def_excpt(val) #val, val
+struct siglabel {
+char *name;
+int   number;
+};
+struct siglabel exceptlabels[] = {
+def_excpt(EXCEPTION_ACCESS_VIOLATION),
+def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
+def_excpt(EXCEPTION_BREAKPOINT),
+def_excpt(EXCEPTION_SINGLE_STEP),
+def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
+def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
+def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
+def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
+def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
+def_excpt(EXCEPTION_FLT_OVERFLOW),
+def_excpt(EXCEPTION_FLT_STACK_CHECK),
+def_excpt(EXCEPTION_FLT_UNDERFLOW),
+def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
+def_excpt(EXCEPTION_INT_OVERFLOW),
+def_excpt(EXCEPTION_PRIV_INSTRUCTION),
+def_excpt(EXCEPTION_IN_PAGE_ERROR),
+def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
+def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
+def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
+def_excpt(EXCEPTION_STACK_OVERFLOW),
+def_excpt(EXCEPTION_INVALID_DISPOSITION),
+def_excpt(EXCEPTION_GUARD_PAGE),
+def_excpt(EXCEPTION_INVALID_HANDLE),
+NULL, 0
+};
+const char* os::exception_name(int exception_code, char *buf, size_t size) {
+for (int i = 0; exceptlabels[i].name != NULL; i++) {
+if (exceptlabels[i].number == exception_code) {
+jio_snprintf(buf, size, "%s", exceptlabels[i].name);
+return buf;
+}
+}
+return NULL;
+}
+//-----------------------------------------------------------------------------
+LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
+// handle exception caused by idiv; should only happen for -MinInt/-1
+// (division by zero is handled explicitly)
+#ifdef _M_IA64
+assert(0, "Fix Handle_IDiv_Exception");
+#elif _M_AMD64
+PCONTEXT ctx = exceptionInfo->ContextRecord;
+address pc = (address)ctx->Rip;
+NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
+assert(pc[0] == 0xF7, "not an idiv opcode");
+assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
+assert(ctx->Rax == min_jint, "unexpected idiv exception");
+// set correct result values and continue after idiv instruction
+ctx->Rip = (DWORD)pc + 2;        // idiv reg, reg  is 2 bytes
+ctx->Rax = (DWORD)min_jint;      // result
+ctx->Rdx = (DWORD)0;             // remainder
+// Continue the execution
+#else
+PCONTEXT ctx = exceptionInfo->ContextRecord;
+address pc = (address)ctx->Eip;
+NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
+assert(pc[0] == 0xF7, "not an idiv opcode");
+assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
+assert(ctx->Eax == min_jint, "unexpected idiv exception");
+// set correct result values and continue after idiv instruction
+ctx->Eip = (DWORD)pc + 2;        // idiv reg, reg  is 2 bytes
+ctx->Eax = (DWORD)min_jint;      // result
+ctx->Edx = (DWORD)0;             // remainder
+// Continue the execution
+#endif
+return EXCEPTION_CONTINUE_EXECUTION;
+}
+#ifndef  _WIN64
+//-----------------------------------------------------------------------------
+LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
+// handle exception caused by native mothod modifying control word
+PCONTEXT ctx = exceptionInfo->ContextRecord;
+DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
+switch (exception_code) {
+case EXCEPTION_FLT_DENORMAL_OPERAND:
+case EXCEPTION_FLT_DIVIDE_BY_ZERO:
+case EXCEPTION_FLT_INEXACT_RESULT:
+case EXCEPTION_FLT_INVALID_OPERATION:
+case EXCEPTION_FLT_OVERFLOW:
+case EXCEPTION_FLT_STACK_CHECK:
+case EXCEPTION_FLT_UNDERFLOW:
+jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
+if (fp_control_word != ctx->FloatSave.ControlWord) {
+// Restore FPCW and mask out FLT exceptions
+ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
+// Mask out pending FLT exceptions
+ctx->FloatSave.StatusWord &=  0xffffff00;
+return EXCEPTION_CONTINUE_EXECUTION;
+}
+}
+return EXCEPTION_CONTINUE_SEARCH;
+}
+#else //_WIN64
+/*
+On Windows, the mxcsr control bits are non-volatile across calls
+See also CR 6192333
+If EXCEPTION_FLT_* happened after some native method modified
+mxcsr - it is not a jvm fault.
+However should we decide to restore of mxcsr after a faulty
+native method we can uncomment following code
+jint MxCsr = INITIAL_MXCSR;
+// we can't use StubRoutines::addr_mxcsr_std()
+// because in Win64 mxcsr is not saved there
+if (MxCsr != ctx->MxCsr) {
+ctx->MxCsr = MxCsr;
+return EXCEPTION_CONTINUE_EXECUTION;
+}
+*/
+#endif //_WIN64
+// Fatal error reporting is single threaded so we can make this a
+// static and preallocated.  If it's more than MAX_PATH silently ignore
+// it.
+static char saved_error_file[MAX_PATH] = {0};
+void os::set_error_file(const char *logfile) {
+if (strlen(logfile) <= MAX_PATH) {
+strncpy(saved_error_file, logfile, MAX_PATH);
+}
+}
+static inline void report_error(Thread* t, DWORD exception_code,
+address addr, void* siginfo, void* context) {
+VMError err(t, exception_code, addr, siginfo, context);
+err.report_and_die();
+// If UseOsErrorReporting, this will return here and save the error file
+// somewhere where we can find it in the minidump.
+}
+//-----------------------------------------------------------------------------
+LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
+if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
+DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
+#ifdef _M_IA64
+address pc = (address) exceptionInfo->ContextRecord->StIIP;
+#elif _M_AMD64
+address pc = (address) exceptionInfo->ContextRecord->Rip;
+#else
+address pc = (address) exceptionInfo->ContextRecord->Eip;
+#endif
+Thread* t = ThreadLocalStorage::get_thread_slow();          // slow & steady
+#ifndef _WIN64
+// Execution protection violation - win32 running on AMD64 only
+// Handled first to avoid misdiagnosis as a "normal" access violation;
+// This is safe to do because we have a new/unique ExceptionInformation
+// code for this condition.
+if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
+PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
+address addr = (address) exceptionRecord->ExceptionInformation[1];
+if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
+int page_size = os::vm_page_size();
+// Make sure the pc and the faulting address are sane.
+//
+// If an instruction spans a page boundary, and the page containing
+// the beginning of the instruction is executable but the following
+// page is not, the pc and the faulting address might be slightly
+// different - we still want to unguard the 2nd page in this case.
+//
+// 15 bytes seems to be a (very) safe value for max instruction size.
+bool pc_is_near_addr =
+(pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
+bool instr_spans_page_boundary =
+(align_size_down((intptr_t) pc ^ (intptr_t) addr,
+(intptr_t) page_size) > 0);
+if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
+static volatile address last_addr =
+(address) os::non_memory_address_word();
+// In conservative mode, don't unguard unless the address is in the VM
+if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
+(UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
+// Unguard and retry
+address page_start =
+(address) align_size_down((intptr_t) addr, (intptr_t) page_size);
+bool res = os::unguard_memory((char*) page_start, page_size);
+if (PrintMiscellaneous && Verbose) {
+char buf[256];
+jio_snprintf(buf, sizeof(buf), "Execution protection violation "
+"at " INTPTR_FORMAT
+", unguarding " INTPTR_FORMAT ": %s", addr,
+page_start, (res ? "success" : strerror(errno)));
+tty->print_raw_cr(buf);
+}
+// Set last_addr so if we fault again at the same address, we don't
+// end up in an endless loop.
+//
+// There are two potential complications here.  Two threads trapping
+// at the same address at the same time could cause one of the
+// threads to think it already unguarded, and abort the VM.  Likely
+// very rare.
+//
+// The other race involves two threads alternately trapping at
+// different addresses and failing to unguard the page, resulting in
+// an endless loop.  This condition is probably even more unlikely
+// than the first.
+//
+// Although both cases could be avoided by using locks or thread
+// local last_addr, these solutions are unnecessary complication:
+// this handler is a best-effort safety net, not a complete solution.
+// It is disabled by default and should only be used as a workaround
+// in case we missed any no-execute-unsafe VM code.
+last_addr = addr;
+return EXCEPTION_CONTINUE_EXECUTION;
+}
+}
+// Last unguard failed or not unguarding
+tty->print_raw_cr("Execution protection violation");
+report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
+exceptionInfo->ContextRecord);
+return EXCEPTION_CONTINUE_SEARCH;
+}
+}
+#endif // _WIN64
+// Check to see if we caught the safepoint code in the
+// process of write protecting the memory serialization page.
+// It write enables the page immediately after protecting it
+// so just return.
+if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
+JavaThread* thread = (JavaThread*) t;
+PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+address addr = (address) exceptionRecord->ExceptionInformation[1];
+if ( os::is_memory_serialize_page(thread, addr) ) {
+// Block current thread until the memory serialize page permission restored.
+os::block_on_serialize_page_trap();
+return EXCEPTION_CONTINUE_EXECUTION;
+}
+}
+if (t != NULL && t->is_Java_thread()) {
+JavaThread* thread = (JavaThread*) t;
+bool in_java = thread->thread_state() == _thread_in_Java;
+// Handle potential stack overflows up front.
+if (exception_code == EXCEPTION_STACK_OVERFLOW) {
+if (os::uses_stack_guard_pages()) {
+#ifdef _M_IA64
+//
+// If it's a legal stack address continue, Windows will map it in.
+//
+PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+address addr = (address) exceptionRecord->ExceptionInformation[1];
+if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
+return EXCEPTION_CONTINUE_EXECUTION;
+// The register save area is the same size as the memory stack
+// and starts at the page just above the start of the memory stack.
+// If we get a fault in this area, we've run out of register
+// stack.  If we are in java, try throwing a stack overflow exception.
+if (addr > thread->stack_base() &&
+addr <= (thread->stack_base()+thread->stack_size()) ) {
+char buf[256];
+jio_snprintf(buf, sizeof(buf),
+"Register stack overflow, addr:%p, stack_base:%p\n",
+addr, thread->stack_base() );
+tty->print_raw_cr(buf);
+// If not in java code, return and hope for the best.
+return in_java ? Handle_Exception(exceptionInfo,
+SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
+:  EXCEPTION_CONTINUE_EXECUTION;
+}
+#endif
+if (thread->stack_yellow_zone_enabled()) {
+// Yellow zone violation.  The o/s has unprotected the first yellow
+// zone page for us.  Note:  must call disable_stack_yellow_zone to
+// update the enabled status, even if the zone contains only one page.
+thread->disable_stack_yellow_zone();
+// If not in java code, return and hope for the best.
+return in_java ? Handle_Exception(exceptionInfo,
+SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
+:  EXCEPTION_CONTINUE_EXECUTION;
+} else {
+// Fatal red zone violation.
+thread->disable_stack_red_zone();
+tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
+report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+exceptionInfo->ContextRecord);
+return EXCEPTION_CONTINUE_SEARCH;
+}
+} else if (in_java) {
+// JVM-managed guard pages cannot be used on win95/98.  The o/s provides
+// a one-time-only guard page, which it has released to us.  The next
+// stack overflow on this thread will result in an ACCESS_VIOLATION.
+return Handle_Exception(exceptionInfo,
+SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
+} else {
+// Can only return and hope for the best.  Further stack growth will
+// result in an ACCESS_VIOLATION.
+return EXCEPTION_CONTINUE_EXECUTION;
+}
+} else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
+// Either stack overflow or null pointer exception.
+if (in_java) {
+PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+address addr = (address) exceptionRecord->ExceptionInformation[1];
+address stack_end = thread->stack_base() - thread->stack_size();
+if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
+// Stack overflow.
+assert(!os::uses_stack_guard_pages(),
+"should be caught by red zone code above.");
+return Handle_Exception(exceptionInfo,
+SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
+}
+//
+// Check for safepoint polling and implicit null
+// We only expect null pointers in the stubs (vtable)
+// the rest are checked explicitly now.
+//
+CodeBlob* cb = CodeCache::find_blob(pc);
+if (cb != NULL) {
+if (os::is_poll_address(addr)) {
+address stub = SharedRuntime::get_poll_stub(pc);
+return Handle_Exception(exceptionInfo, stub);
+}
+}
+{
+#ifdef _WIN64
+//
+// If it's a legal stack address map the entire region in
+//
+PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+address addr = (address) exceptionRecord->ExceptionInformation[1];
+if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
+addr = (address)((uintptr_t)addr &
+(~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
+os::commit_memory( (char *)addr, thread->stack_base() - addr );
+return EXCEPTION_CONTINUE_EXECUTION;
+}
+else
+#endif
+{
+// Null pointer exception.
+#ifdef _M_IA64
+// We catch register stack overflows in compiled code by doing
+// an explicit compare and executing a st8(G0, G0) if the
+// BSP enters into our guard area.  We test for the overflow
+// condition and fall into the normal null pointer exception
+// code if BSP hasn't overflowed.
+if ( in_java ) {
+if(thread->register_stack_overflow()) {
+assert((address)exceptionInfo->ContextRecord->IntS3 ==
+thread->register_stack_limit(),
+"GR7 doesn't contain register_stack_limit");
+// Disable the yellow zone which sets the state that
+// we've got a stack overflow problem.
+if (thread->stack_yellow_zone_enabled()) {
+thread->disable_stack_yellow_zone();
+}
+// Give us some room to process the exception
+thread->disable_register_stack_guard();
+// Update GR7 with the new limit so we can continue running
+// compiled code.
+exceptionInfo->ContextRecord->IntS3 =
+(ULONGLONG)thread->register_stack_limit();
+return Handle_Exception(exceptionInfo,
+SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
+} else {
+//
+// Check for implicit null
+// We only expect null pointers in the stubs (vtable)
+// the rest are checked explicitly now.
+//
+CodeBlob* cb = CodeCache::find_blob(pc);
+if (cb != NULL) {
+if (VtableStubs::stub_containing(pc) != NULL) {
+if (((uintptr_t)addr) < os::vm_page_size() ) {
+// an access to the first page of VM--assume it is a null pointer
+return Handle_Exception(exceptionInfo,
+SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL));
+}
+}
+}
+}
+} // in_java
+// IA64 doesn't use implicit null checking yet. So we shouldn't
+// get here.
+tty->print_raw_cr("Access violation, possible null pointer exception");
+report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+exceptionInfo->ContextRecord);
+return EXCEPTION_CONTINUE_SEARCH;
+#else /* !IA64 */
+// Windows 98 reports faulting addresses incorrectly
+if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
+!os::win32::is_nt()) {
+return Handle_Exception(exceptionInfo,
+SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL));
+}
+report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+exceptionInfo->ContextRecord);
+return EXCEPTION_CONTINUE_SEARCH;
+#endif
+}
+}
+}
+#ifdef _WIN64
+// Special care for fast JNI field accessors.
+// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
+// in and the heap gets shrunk before the field access.
+if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
+address addr = JNI_FastGetField::find_slowcase_pc(pc);
+if (addr != (address)-1) {
+return Handle_Exception(exceptionInfo, addr);
+}
+}
+#endif
+#ifdef _WIN64
+// Windows will sometimes generate an access violation
+// when we call malloc.  Since we use VectoredExceptions
+// on 64 bit platforms, we see this exception.  We must
+// pass this exception on so Windows can recover.
+// We check to see if the pc of the fault is in NTDLL.DLL
+// if so, we pass control on to Windows for handling.
+if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
+#endif
+// Stack overflow or null pointer exception in native code.
+report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+exceptionInfo->ContextRecord);
+return EXCEPTION_CONTINUE_SEARCH;
+}
+if (in_java) {
+switch (exception_code) {
+case EXCEPTION_INT_DIVIDE_BY_ZERO:
+return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
+case EXCEPTION_INT_OVERFLOW:
+return Handle_IDiv_Exception(exceptionInfo);
+} // switch
+}
+#ifndef _WIN64
+if ((thread->thread_state() == _thread_in_Java) ||
+(thread->thread_state() == _thread_in_native) )
+{
+LONG result=Handle_FLT_Exception(exceptionInfo);
+if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
+}
+#endif //_WIN64
+}
+if (exception_code != EXCEPTION_BREAKPOINT) {
+#ifndef _WIN64
+report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+exceptionInfo->ContextRecord);
+#else
+// Itanium Windows uses a VectoredExceptionHandler
+// Which means that C++ programatic exception handlers (try/except)
+// will get here.  Continue the search for the right except block if
+// the exception code is not a fatal code.
+switch ( exception_code ) {
+case EXCEPTION_ACCESS_VIOLATION:
+case EXCEPTION_STACK_OVERFLOW:
+case EXCEPTION_ILLEGAL_INSTRUCTION:
+case EXCEPTION_ILLEGAL_INSTRUCTION_2:
+case EXCEPTION_INT_OVERFLOW:
+case EXCEPTION_INT_DIVIDE_BY_ZERO:
+{  report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+exceptionInfo->ContextRecord);
+}
+break;
+default:
+break;
+}
+#endif
+}
+return EXCEPTION_CONTINUE_SEARCH;
+}
+#ifndef _WIN64
+// Special care for fast JNI accessors.
+// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
+// the heap gets shrunk before the field access.
+// Need to install our own structured exception handler since native code may
+// install its own.
+LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
+DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
+if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
+address pc = (address) exceptionInfo->ContextRecord->Eip;
+address addr = JNI_FastGetField::find_slowcase_pc(pc);
+if (addr != (address)-1) {
+return Handle_Exception(exceptionInfo, addr);
+}
+}
+return EXCEPTION_CONTINUE_SEARCH;
+}
+#define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
+Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
+__try { \
+return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
+} __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
+} \
+return 0; \
+}
+DEFINE_FAST_GETFIELD(jboolean, bool,   Boolean)
+DEFINE_FAST_GETFIELD(jbyte,    byte,   Byte)
+DEFINE_FAST_GETFIELD(jchar,    char,   Char)
+DEFINE_FAST_GETFIELD(jshort,   short,  Short)
+DEFINE_FAST_GETFIELD(jint,     int,    Int)
+DEFINE_FAST_GETFIELD(jlong,    long,   Long)
+DEFINE_FAST_GETFIELD(jfloat,   float,  Float)
+DEFINE_FAST_GETFIELD(jdouble,  double, Double)
+address os::win32::fast_jni_accessor_wrapper(BasicType type) {
+switch (type) {
+case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
+case T_BYTE:    return (address)jni_fast_GetByteField_wrapper;
+case T_CHAR:    return (address)jni_fast_GetCharField_wrapper;
+case T_SHORT:   return (address)jni_fast_GetShortField_wrapper;
+case T_INT:     return (address)jni_fast_GetIntField_wrapper;
+case T_LONG:    return (address)jni_fast_GetLongField_wrapper;
+case T_FLOAT:   return (address)jni_fast_GetFloatField_wrapper;
+case T_DOUBLE:  return (address)jni_fast_GetDoubleField_wrapper;
+default:        ShouldNotReachHere();
+}
+return (address)-1;
+}
+#endif
+// Virtual Memory
+int os::vm_page_size() { return os::win32::vm_page_size(); }
+int os::vm_allocation_granularity() {
+return os::win32::vm_allocation_granularity();
+}
+// Windows large page support is available on Windows 2003. In order to use
+// large page memory, the administrator must first assign additional privilege
+// to the user:
+//   + select Control Panel -> Administrative Tools -> Local Security Policy
+//   + select Local Policies -> User Rights Assignment
+//   + double click "Lock pages in memory", add users and/or groups
+//   + reboot
+// Note the above steps are needed for administrator as well, as administrators
+// by default do not have the privilege to lock pages in memory.
+//
+// Note about Windows 2003: although the API supports committing large page
+// memory on a page-by-page basis and VirtualAlloc() returns success under this
+// scenario, I found through experiment it only uses large page if the entire
+// memory region is reserved and committed in a single VirtualAlloc() call.
+// This makes Windows large page support more or less like Solaris ISM, in
+// that the entire heap must be committed upfront. This probably will change
+// in the future, if so the code below needs to be revisited.
+#ifndef MEM_LARGE_PAGES
+#define MEM_LARGE_PAGES 0x20000000
+#endif
+// GetLargePageMinimum is only available on Windows 2003. The other functions
+// are available on NT but not on Windows 98/Me. We have to resolve them at
+// runtime.
+typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
+typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
+(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
+typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
+typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
+static GetLargePageMinimum_func_type   _GetLargePageMinimum;
+static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
+static OpenProcessToken_func_type      _OpenProcessToken;
+static LookupPrivilegeValue_func_type  _LookupPrivilegeValue;
+static HINSTANCE _kernel32;
+static HINSTANCE _advapi32;
+static HANDLE    _hProcess;
+static HANDLE    _hToken;
+static size_t _large_page_size = 0;
+static bool resolve_functions_for_large_page_init() {
+_kernel32 = LoadLibrary("kernel32.dll");
+if (_kernel32 == NULL) return false;
+_GetLargePageMinimum   = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
+GetProcAddress(_kernel32, "GetLargePageMinimum"));
+if (_GetLargePageMinimum == NULL) return false;
+_advapi32 = LoadLibrary("advapi32.dll");
+if (_advapi32 == NULL) return false;
+_AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
+GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
+_OpenProcessToken      = CAST_TO_FN_PTR(OpenProcessToken_func_type,
+GetProcAddress(_advapi32, "OpenProcessToken"));
+_LookupPrivilegeValue  = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
+GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
+return _AdjustTokenPrivileges != NULL &&
+_OpenProcessToken      != NULL &&
+_LookupPrivilegeValue  != NULL;
+}
+static bool request_lock_memory_privilege() {
+_hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
+os::current_process_id());
+LUID luid;
+if (_hProcess != NULL &&
+_OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
+_LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
+TOKEN_PRIVILEGES tp;
+tp.PrivilegeCount = 1;
+tp.Privileges[0].Luid = luid;
+tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
+// AdjustTokenPrivileges() may return TRUE even when it couldn't change the
+// privilege. Check GetLastError() too. See MSDN document.
+if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
+(GetLastError() == ERROR_SUCCESS)) {
+return true;
+}
+}
+return false;
+}
+static void cleanup_after_large_page_init() {
+_GetLargePageMinimum = NULL;
+_AdjustTokenPrivileges = NULL;
+_OpenProcessToken = NULL;
+_LookupPrivilegeValue = NULL;
+if (_kernel32) FreeLibrary(_kernel32);
+_kernel32 = NULL;
+if (_advapi32) FreeLibrary(_advapi32);
+_advapi32 = NULL;
+if (_hProcess) CloseHandle(_hProcess);
+_hProcess = NULL;
+if (_hToken) CloseHandle(_hToken);
+_hToken = NULL;
+}
+bool os::large_page_init() {
+if (!UseLargePages) return false;
+// print a warning if any large page related flag is specified on command line
+bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
+!FLAG_IS_DEFAULT(LargePageSizeInBytes);
+bool success = false;
+# define WARN(msg) if (warn_on_failure) { warning(msg); }
+if (resolve_functions_for_large_page_init()) {
+if (request_lock_memory_privilege()) {
+size_t s = _GetLargePageMinimum();
+if (s) {
+#if defined(IA32) || defined(AMD64)
+if (s > 4*M || LargePageSizeInBytes > 4*M) {
+WARN("JVM cannot use large pages bigger than 4mb.");
+} else {
+#endif
+if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
+_large_page_size = LargePageSizeInBytes;
+} else {
+_large_page_size = s;
+}
+success = true;
+#if defined(IA32) || defined(AMD64)
+}
+#endif
+} else {
+WARN("Large page is not supported by the processor.");
+}
+} else {
+WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
+}
+} else {
+WARN("Large page is not supported by the operating system.");
+}
+#undef WARN
+const size_t default_page_size = (size_t) vm_page_size();
+if (success && _large_page_size > default_page_size) {
+_page_sizes[0] = _large_page_size;
+_page_sizes[1] = default_page_size;
+_page_sizes[2] = 0;
+}
+cleanup_after_large_page_init();
+return success;
+}
+// On win32, one cannot release just a part of reserved memory, it's an
+// all or nothing deal.  When we split a reservation, we must break the
+// reservation into two reservations.
+void os::split_reserved_memory(char *base, size_t size, size_t split,
+bool realloc) {
+if (size > 0) {
+release_memory(base, size);
+if (realloc) {
+reserve_memory(split, base);
+}
+if (size != split) {
+reserve_memory(size - split, base + split);
+}
+}
+}
+char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
+assert((size_t)addr % os::vm_allocation_granularity() == 0,
+"reserve alignment");
+assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
+char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE,
+PAGE_EXECUTE_READWRITE);
+assert(res == NULL || addr == NULL || addr == res,
+"Unexpected address from reserve.");
+return res;
+}
+// Reserve memory at an arbitrary address, only if that area is
+// available (and not reserved for something else).
+char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
+// Windows os::reserve_memory() fails of the requested address range is
+// not avilable.
+return reserve_memory(bytes, requested_addr);
+}
+size_t os::large_page_size() {
+return _large_page_size;
+}
+bool os::can_commit_large_page_memory() {
+// Windows only uses large page memory when the entire region is reserved
+// and committed in a single VirtualAlloc() call. This may change in the
+// future, but with Windows 2003 it's not possible to commit on demand.
+return false;
+}
+char* os::reserve_memory_special(size_t bytes) {
+DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
+char * res = (char *)VirtualAlloc(NULL, bytes, flag, PAGE_READWRITE);
+return res;
+}
+bool os::release_memory_special(char* base, size_t bytes) {
+return release_memory(base, bytes);
+}
+void os::print_statistics() {
+}
+bool os::commit_memory(char* addr, size_t bytes) {
+if (bytes == 0) {
+// Don't bother the OS with noops.
+return true;
+}
+assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
+assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
+// Don't attempt to print anything if the OS call fails. We're
+// probably low on resources, so the print itself may cause crashes.
+return VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE) != NULL;
+}
+bool os::commit_memory(char* addr, size_t size, size_t alignment_hint) {
+return commit_memory(addr, size);
+}
+bool os::uncommit_memory(char* addr, size_t bytes) {
+if (bytes == 0) {
+// Don't bother the OS with noops.
+return true;
+}
+assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
+assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
+return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
+}
+bool os::release_memory(char* addr, size_t bytes) {
+return VirtualFree(addr, 0, MEM_RELEASE) != 0;
+}
+bool os::protect_memory(char* addr, size_t bytes) {
+DWORD old_status;
+return VirtualProtect(addr, bytes, PAGE_READONLY, &old_status) != 0;
+}
+bool os::guard_memory(char* addr, size_t bytes) {
+DWORD old_status;
+return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_status) != 0;
+}
+bool os::unguard_memory(char* addr, size_t bytes) {
+DWORD old_status;
+return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &old_status) != 0;
+}
+void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
+void os::free_memory(char *addr, size_t bytes)         { }
+void os::numa_make_global(char *addr, size_t bytes)    { }
+void os::numa_make_local(char *addr, size_t bytes)     { }
+bool os::numa_topology_changed()                       { return false; }
+size_t os::numa_get_groups_num()                       { return 1; }
+int os::numa_get_group_id()                            { return 0; }
+size_t os::numa_get_leaf_groups(int *ids, size_t size) {
+if (size > 0) {
+ids[0] = 0;
+return 1;
+}
+return 0;
+}
+bool os::get_page_info(char *start, page_info* info) {
+return false;
+}
+char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
+return end;
+}
+char* os::non_memory_address_word() {
+// Must never look like an address returned by reserve_memory,
+// even in its subfields (as defined by the CPU immediate fields,
+// if the CPU splits constants across multiple instructions).
+return (char*)-1;
+}
+#define MAX_ERROR_COUNT 100
+#define SYS_THREAD_ERROR 0xffffffffUL
+void os::pd_start_thread(Thread* thread) {
+DWORD ret = ResumeThread(thread->osthread()->thread_handle());
+// Returns previous suspend state:
+// 0:  Thread was not suspended
+// 1:  Thread is running now
+// >1: Thread is still suspended.
+assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
+}
+size_t os::read(int fd, void *buf, unsigned int nBytes) {
+return ::read(fd, buf, nBytes);
+}
+class HighResolutionInterval {
+// The default timer resolution seems to be 10 milliseconds.
+// (Where is this written down?)
+// If someone wants to sleep for only a fraction of the default,
+// then we set the timer resolution down to 1 millisecond for
+// the duration of their interval.
+// We carefully set the resolution back, since otherwise we
+// seem to incur an overhead (3%?) that we don't need.
+// CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
+// Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
+// Alternatively, we could compute the relative error (503/500 = .6%) and only use
+// timeBeginPeriod() if the relative error exceeded some threshold.
+// timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
+// to decreased efficiency related to increased timer "tick" rates.  We want to minimize
+// (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
+// resolution timers running.
+private:
+jlong resolution;
+public:
+HighResolutionInterval(jlong ms) {
+resolution = ms % 10L;
+if (resolution != 0) {
+MMRESULT result = timeBeginPeriod(1L);
+}
+}
+~HighResolutionInterval() {
+if (resolution != 0) {
+MMRESULT result = timeEndPeriod(1L);
+}
+resolution = 0L;
+}
+};
+int os::sleep(Thread* thread, jlong ms, bool interruptable) {
+jlong limit = (jlong) MAXDWORD;
+while(ms > limit) {
+int res;
+if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
+return res;
+ms -= limit;
+}
+assert(thread == Thread::current(),  "thread consistency check");
+OSThread* osthread = thread->osthread();
+OSThreadWaitState osts(osthread, false /* not Object.wait() */);
+int result;
+if (interruptable) {
+assert(thread->is_Java_thread(), "must be java thread");
+JavaThread *jt = (JavaThread *) thread;
+ThreadBlockInVM tbivm(jt);
+jt->set_suspend_equivalent();
+// cleared by handle_special_suspend_equivalent_condition() or
+// java_suspend_self() via check_and_wait_while_suspended()
+HANDLE events[1];
+events[0] = osthread->interrupt_event();
+HighResolutionInterval *phri=NULL;
+if(!ForceTimeHighResolution)
+phri = new HighResolutionInterval( ms );
+if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
+result = OS_TIMEOUT;
+} else {
+ResetEvent(osthread->interrupt_event());
+osthread->set_interrupted(false);
+result = OS_INTRPT;
+}
+delete phri; //if it is NULL, harmless
+// were we externally suspended while we were waiting?
+jt->check_and_wait_while_suspended();
+} else {
+assert(!thread->is_Java_thread(), "must not be java thread");
+Sleep((long) ms);
+result = OS_TIMEOUT;
+}
+return result;
+}
+// Sleep forever; naked call to OS-specific sleep; use with CAUTION
+void os::infinite_sleep() {
+while (true) {    // sleep forever ...
+Sleep(100000);  // ... 100 seconds at a time
+}
+}
+typedef BOOL (WINAPI * STTSignature)(void) ;
+os::YieldResult os::NakedYield() {
+// Use either SwitchToThread() or Sleep(0)
+// Consider passing back the return value from SwitchToThread().
+// We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
+// In that case we revert to Sleep(0).
+static volatile STTSignature stt = (STTSignature) 1 ;
+if (stt == ((STTSignature) 1)) {
+stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
+// It's OK if threads race during initialization as the operation above is idempotent.
+}
+if (stt != NULL) {
+return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
+} else {
+Sleep (0) ;
+}
+return os::YIELD_UNKNOWN ;
+}
+void os::yield() {  os::NakedYield(); }
+void os::yield_all(int attempts) {
+// Yields to all threads, including threads with lower priorities
+Sleep(1);
+}
+// Win32 only gives you access to seven real priorities at a time,
+// so we compress Java's ten down to seven.  It would be better
+// if we dynamically adjusted relative priorities.
+int os::java_to_os_priority[MaxPriority + 1] = {
+THREAD_PRIORITY_IDLE,                         // 0  Entry should never be used
+THREAD_PRIORITY_LOWEST,                       // 1  MinPriority
+THREAD_PRIORITY_LOWEST,                       // 2
+THREAD_PRIORITY_BELOW_NORMAL,                 // 3
+THREAD_PRIORITY_BELOW_NORMAL,                 // 4
+THREAD_PRIORITY_NORMAL,                       // 5  NormPriority
+THREAD_PRIORITY_NORMAL,                       // 6
+THREAD_PRIORITY_ABOVE_NORMAL,                 // 7
+THREAD_PRIORITY_ABOVE_NORMAL,                 // 8
+THREAD_PRIORITY_HIGHEST,                      // 9  NearMaxPriority
+THREAD_PRIORITY_HIGHEST                       // 10 MaxPriority
+};
+int prio_policy1[MaxPriority + 1] = {
+THREAD_PRIORITY_IDLE,                         // 0  Entry should never be used
+THREAD_PRIORITY_LOWEST,                       // 1  MinPriority
+THREAD_PRIORITY_LOWEST,                       // 2
+THREAD_PRIORITY_BELOW_NORMAL,                 // 3
+THREAD_PRIORITY_BELOW_NORMAL,                 // 4
+THREAD_PRIORITY_NORMAL,                       // 5  NormPriority
+THREAD_PRIORITY_ABOVE_NORMAL,                 // 6
+THREAD_PRIORITY_ABOVE_NORMAL,                 // 7
+THREAD_PRIORITY_HIGHEST,                      // 8
+THREAD_PRIORITY_HIGHEST,                      // 9  NearMaxPriority
+THREAD_PRIORITY_TIME_CRITICAL                 // 10 MaxPriority
+};
+static int prio_init() {
+// If ThreadPriorityPolicy is 1, switch tables
+if (ThreadPriorityPolicy == 1) {
+int i;
+for (i = 0; i < MaxPriority + 1; i++) {
+os::java_to_os_priority[i] = prio_policy1[i];
+}
+}
+return 0;
+}
+OSReturn os::set_native_priority(Thread* thread, int priority) {
+if (!UseThreadPriorities) return OS_OK;
+bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
+return ret ? OS_OK : OS_ERR;
+}
+OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
+if ( !UseThreadPriorities ) {
+*priority_ptr = java_to_os_priority[NormPriority];
+return OS_OK;
+}
+int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
+if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
+assert(false, "GetThreadPriority failed");
+return OS_ERR;
+}
+*priority_ptr = os_prio;
+return OS_OK;
+}
+// Hint to the underlying OS that a task switch would not be good.
+// Void return because it's a hint and can fail.
+void os::hint_no_preempt() {}
+void os::interrupt(Thread* thread) {
+assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
+"possibility of dangling Thread pointer");
+OSThread* osthread = thread->osthread();
+osthread->set_interrupted(true);
+// More than one thread can get here with the same value of osthread,
+// resulting in multiple notifications.  We do, however, want the store
+// to interrupted() to be visible to other threads before we post
+// the interrupt event.
+OrderAccess::release();
+SetEvent(osthread->interrupt_event());
+// For JSR166:  unpark after setting status
+if (thread->is_Java_thread())
+((JavaThread*)thread)->parker()->unpark();
+ParkEvent * ev = thread->_ParkEvent ;
+if (ev != NULL) ev->unpark() ;
+}
+bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
+assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
+"possibility of dangling Thread pointer");
+OSThread* osthread = thread->osthread();
+bool interrupted;
+interrupted = osthread->interrupted();
+if (clear_interrupted == true) {
+osthread->set_interrupted(false);
+ResetEvent(osthread->interrupt_event());
+} // Otherwise leave the interrupted state alone
+return interrupted;
+}
+// Get's a pc (hint) for a running thread. Currently used only for profiling.
+ExtendedPC os::get_thread_pc(Thread* thread) {
+CONTEXT context;
+context.ContextFlags = CONTEXT_CONTROL;
+HANDLE handle = thread->osthread()->thread_handle();
+#ifdef _M_IA64
+assert(0, "Fix get_thread_pc");
+return ExtendedPC(NULL);
+#else
+if (GetThreadContext(handle, &context)) {
+#ifdef _M_AMD64
+return ExtendedPC((address) context.Rip);
+#else
+return ExtendedPC((address) context.Eip);
+#endif
+} else {
+return ExtendedPC(NULL);
+}
+#endif
+}
+// GetCurrentThreadId() returns DWORD
+intx os::current_thread_id()          { return GetCurrentThreadId(); }
+static int _initial_pid = 0;
+int os::current_process_id()
+{
+return (_initial_pid ? _initial_pid : _getpid());
+}
+int    os::win32::_vm_page_size       = 0;
+int    os::win32::_vm_allocation_granularity = 0;
+int    os::win32::_processor_type     = 0;
+// Processor level is not available on non-NT systems, use vm_version instead
+int    os::win32::_processor_level    = 0;
+julong os::win32::_physical_memory    = 0;
+size_t os::win32::_default_stack_size = 0;
+intx os::win32::_os_thread_limit    = 0;
+volatile intx os::win32::_os_thread_count    = 0;
+bool   os::win32::_is_nt              = false;
+void os::win32::initialize_system_info() {
+SYSTEM_INFO si;
+GetSystemInfo(&si);
+_vm_page_size    = si.dwPageSize;
+_vm_allocation_granularity = si.dwAllocationGranularity;
+_processor_type  = si.dwProcessorType;
+_processor_level = si.wProcessorLevel;
+_processor_count = si.dwNumberOfProcessors;
+MEMORYSTATUS ms;
+// also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
+// dwMemoryLoad (% of memory in use)
+GlobalMemoryStatus(&ms);
+_physical_memory = ms.dwTotalPhys;
+OSVERSIONINFO oi;
+oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+GetVersionEx(&oi);
+switch(oi.dwPlatformId) {
+case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
+case VER_PLATFORM_WIN32_NT:      _is_nt = true;  break;
+default: fatal("Unknown platform");
+}
+_default_stack_size = os::current_stack_size();
+assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
+assert((_default_stack_size & (_vm_page_size - 1)) == 0,
+"stack size not a multiple of page size");
+initialize_performance_counter();
+// Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
+// known to deadlock the system, if the VM issues to thread operations with
+// a too high frequency, e.g., such as changing the priorities.
+// The 6000 seems to work well - no deadlocks has been notices on the test
+// programs that we have seen experience this problem.
+if (!os::win32::is_nt()) {
+StarvationMonitorInterval = 6000;
+}
+}
+void os::win32::setmode_streams() {
+_setmode(_fileno(stdin), _O_BINARY);
+_setmode(_fileno(stdout), _O_BINARY);
+_setmode(_fileno(stderr), _O_BINARY);
+}
+int os::message_box(const char* title, const char* message) {
+int result = MessageBox(NULL, message, title,
+MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
+return result == IDYES;
+}
+int os::allocate_thread_local_storage() {
+return TlsAlloc();
+}
+void os::free_thread_local_storage(int index) {
+TlsFree(index);
+}
+void os::thread_local_storage_at_put(int index, void* value) {
+TlsSetValue(index, value);
+assert(thread_local_storage_at(index) == value, "Just checking");
+}
+void* os::thread_local_storage_at(int index) {
+return TlsGetValue(index);
+}
+#ifndef PRODUCT
+#ifndef _WIN64
+// Helpers to check whether NX protection is enabled
+int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
+if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
+pex->ExceptionRecord->NumberParameters > 0 &&
+pex->ExceptionRecord->ExceptionInformation[0] ==
+EXCEPTION_INFO_EXEC_VIOLATION) {
+return EXCEPTION_EXECUTE_HANDLER;
+}
+return EXCEPTION_CONTINUE_SEARCH;
+}
+void nx_check_protection() {
+// If NX is enabled we'll get an exception calling into code on the stack
+char code[] = { (char)0xC3 }; // ret
+void *code_ptr = (void *)code;
+__try {
+__asm call code_ptr
+} __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
+tty->print_raw_cr("NX protection detected.");
+}
+}
+#endif // _WIN64
+#endif // PRODUCT
+// this is called _before_ the global arguments have been parsed
+void os::init(void) {
+_initial_pid = _getpid();
+init_random(1234567);
+win32::initialize_system_info();
+win32::setmode_streams();
+init_page_sizes((size_t) win32::vm_page_size());
+// For better scalability on MP systems (must be called after initialize_system_info)
+#ifndef PRODUCT
+if (is_MP()) {
+NoYieldsInMicrolock = true;
+}
+#endif
+// Initialize main_process and main_thread
+main_process = GetCurrentProcess();  // Remember main_process is a pseudo handle
+if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
+&main_thread, THREAD_ALL_ACCESS, false, 0)) {
+fatal("DuplicateHandle failed\n");
+}
+main_thread_id = (int) GetCurrentThreadId();
+}
+// To install functions for atexit processing
+extern "C" {
+static void perfMemory_exit_helper() {
+perfMemory_exit();
+}
+}
+// this is called _after_ the global arguments have been parsed
+jint os::init_2(void) {
+// Allocate a single page and mark it as readable for safepoint polling
+address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
+guarantee( polling_page != NULL, "Reserve Failed for polling page");
+address return_page  = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
+guarantee( return_page != NULL, "Commit Failed for polling page");
+os::set_polling_page( polling_page );
+#ifndef PRODUCT
+if( Verbose && PrintMiscellaneous )
+tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
+#endif
+if (!UseMembar) {
+address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_EXECUTE_READWRITE);
+guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
+return_page  = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
+guarantee( return_page != NULL, "Commit Failed for memory serialize page");
+os::set_memory_serialize_page( mem_serialize_page );
+#ifndef PRODUCT
+if(Verbose && PrintMiscellaneous)
+tty->print("[Memory Serialize  Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
+#endif
+}
+FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
+// Setup Windows Exceptions
+// On Itanium systems, Structured Exception Handling does not
+// work since stack frames must be walkable by the OS.  Since
+// much of our code is dynamically generated, and we do not have
+// proper unwind .xdata sections, the system simply exits
+// rather than delivering the exception.  To work around
+// this we use VectorExceptions instead.
+#ifdef _WIN64
+if (UseVectoredExceptions) {
+topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
+}
+#endif
+// for debugging float code generation bugs
+if (ForceFloatExceptions) {
+#ifndef  _WIN64
+static long fp_control_word = 0;
+__asm { fstcw fp_control_word }
+// see Intel PPro Manual, Vol. 2, p 7-16
+const long precision = 0x20;
+const long underflow = 0x10;
+const long overflow  = 0x08;
+const long zero_div  = 0x04;
+const long denorm    = 0x02;
+const long invalid   = 0x01;
+fp_control_word |= invalid;
+__asm { fldcw fp_control_word }
+#endif
+}
+// Initialize HPI.
+jint hpi_result = hpi::initialize();
+if (hpi_result != JNI_OK) { return hpi_result; }
+// If stack_commit_size is 0, windows will reserve the default size,
+// but only commit a small portion of it.
+size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
+size_t default_reserve_size = os::win32::default_stack_size();
+size_t actual_reserve_size = stack_commit_size;
+if (stack_commit_size < default_reserve_size) {
+// If stack_commit_size == 0, we want this too
+actual_reserve_size = default_reserve_size;
+}
+JavaThread::set_stack_size_at_create(stack_commit_size);
+// Calculate theoretical max. size of Threads to guard gainst artifical
+// out-of-memory situations, where all available address-space has been
+// reserved by thread stacks.
+assert(actual_reserve_size != 0, "Must have a stack");
+// Calculate the thread limit when we should start doing Virtual Memory
+// banging. Currently when the threads will have used all but 200Mb of space.
+//
+// TODO: consider performing a similar calculation for commit size instead
+// as reserve size, since on a 64-bit platform we'll run into that more
+// often than running out of virtual memory space.  We can use the
+// lower value of the two calculations as the os_thread_limit.
+size_t max_address_space = ((size_t)1 << (BitsPerOop - 1)) - (200 * K * K);
+win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
+// at exit methods are called in the reverse order of their registration.
+// there is no limit to the number of functions registered. atexit does
+// not set errno.
+if (PerfAllowAtExitRegistration) {
+// only register atexit functions if PerfAllowAtExitRegistration is set.
+// atexit functions can be delayed until process exit time, which
+// can be problematic for embedded VM situations. Embedded VMs should
+// call DestroyJavaVM() to assure that VM resources are released.
+// note: perfMemory_exit_helper atexit function may be removed in
+// the future if the appropriate cleanup code can be added to the
+// VM_Exit VMOperation's doit method.
+if (atexit(perfMemory_exit_helper) != 0) {
+warning("os::init_2 atexit(perfMemory_exit_helper) failed");
+}
+}
+// initialize PSAPI or ToolHelp for fatal error handler
+if (win32::is_nt()) _init_psapi();
+else _init_toolhelp();
+#ifndef _WIN64
+// Print something if NX is enabled (win32 on AMD64)
+NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
+#endif
+// initialize thread priority policy
+prio_init();
+return JNI_OK;
+}
+// Mark the polling page as unreadable
+void os::make_polling_page_unreadable(void) {
+DWORD old_status;
+if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
+fatal("Could not disable polling page");
+};
+// Mark the polling page as readable
+void os::make_polling_page_readable(void) {
+DWORD old_status;
+if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
+fatal("Could not enable polling page");
+};
+int os::stat(const char *path, struct stat *sbuf) {
+char pathbuf[MAX_PATH];
+if (strlen(path) > MAX_PATH - 1) {
+errno = ENAMETOOLONG;
+return -1;
+}
+hpi::native_path(strcpy(pathbuf, path));
+int ret = ::stat(pathbuf, sbuf);
+if (sbuf != NULL && UseUTCFileTimestamp) {
+// Fix for 6539723.  st_mtime returned from stat() is dependent on
+// the system timezone and so can return different values for the
+// same file if/when daylight savings time changes.  This adjustment
+// makes sure the same timestamp is returned regardless of the TZ.
+//
+// See:
+// http://msdn.microsoft.com/library/
+//   default.asp?url=/library/en-us/sysinfo/base/
+//   time_zone_information_str.asp
+// and
+// http://msdn.microsoft.com/library/default.asp?url=
+//   /library/en-us/sysinfo/base/settimezoneinformation.asp
+//
+// NOTE: there is a insidious bug here:  If the timezone is changed
+// after the call to stat() but before 'GetTimeZoneInformation()', then
+// the adjustment we do here will be wrong and we'll return the wrong
+// value (which will likely end up creating an invalid class data
+// archive).  Absent a better API for this, or some time zone locking
+// mechanism, we'll have to live with this risk.
+TIME_ZONE_INFORMATION tz;
+DWORD tzid = GetTimeZoneInformation(&tz);
+int daylightBias =
+(tzid == TIME_ZONE_ID_DAYLIGHT) ?  tz.DaylightBias : tz.StandardBias;
+sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
+}
+return ret;
+}
+#define FT2INT64(ft) \
+((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
+// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
+// are used by JVM M&M and JVMTI to get user+sys or user CPU time
+// of a thread.
+//
+// current_thread_cpu_time() and thread_cpu_time(Thread*) returns
+// the fast estimate available on the platform.
+// current_thread_cpu_time() is not optimized for Windows yet
+jlong os::current_thread_cpu_time() {
+// return user + sys since the cost is the same
+return os::thread_cpu_time(Thread::current(), true /* user+sys */);
+}
+jlong os::thread_cpu_time(Thread* thread) {
+// consistent with what current_thread_cpu_time() returns.
+return os::thread_cpu_time(thread, true /* user+sys */);
+}
+jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
+return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
+}
+jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
+// This code is copy from clasic VM -> hpi::sysThreadCPUTime
+// If this function changes, os::is_thread_cpu_time_supported() should too
+if (os::win32::is_nt()) {
+FILETIME CreationTime;
+FILETIME ExitTime;
+FILETIME KernelTime;
+FILETIME UserTime;
+if ( GetThreadTimes(thread->osthread()->thread_handle(),
+&CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
+return -1;
+else
+if (user_sys_cpu_time) {
+return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
+} else {
+return FT2INT64(UserTime) * 100;
+}
+} else {
+return (jlong) timeGetTime() * 1000000;
+}
+}
+void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
+info_ptr->max_value = ALL_64_BITS;        // the max value -- all 64 bits
+info_ptr->may_skip_backward = false;      // GetThreadTimes returns absolute time
+info_ptr->may_skip_forward = false;       // GetThreadTimes returns absolute time
+info_ptr->kind = JVMTI_TIMER_TOTAL_CPU;   // user+system time is returned
+}
+void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
+info_ptr->max_value = ALL_64_BITS;        // the max value -- all 64 bits
+info_ptr->may_skip_backward = false;      // GetThreadTimes returns absolute time
+info_ptr->may_skip_forward = false;       // GetThreadTimes returns absolute time
+info_ptr->kind = JVMTI_TIMER_TOTAL_CPU;   // user+system time is returned
+}
+bool os::is_thread_cpu_time_supported() {
+// see os::thread_cpu_time
+if (os::win32::is_nt()) {
+FILETIME CreationTime;
+FILETIME ExitTime;
+FILETIME KernelTime;
+FILETIME UserTime;
+if ( GetThreadTimes(GetCurrentThread(),
+&CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
+return false;
+else
+return true;
+} else {
+return false;
+}
+}
+// Windows does't provide a loadavg primitive so this is stubbed out for now.
+// It does have primitives (PDH API) to get CPU usage and run queue length.
+// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
+// If we wanted to implement loadavg on Windows, we have a few options:
+//
+// a) Query CPU usage and run queue length and "fake" an answer by
+//    returning the CPU usage if it's under 100%, and the run queue
+//    length otherwise.  It turns out that querying is pretty slow
+//    on Windows, on the order of 200 microseconds on a fast machine.
+//    Note that on the Windows the CPU usage value is the % usage
+//    since the last time the API was called (and the first call
+//    returns 100%), so we'd have to deal with that as well.
+//
+// b) Sample the "fake" answer using a sampling thread and store
+//    the answer in a global variable.  The call to loadavg would
+//    just return the value of the global, avoiding the slow query.
+//
+// c) Sample a better answer using exponential decay to smooth the
+//    value.  This is basically the algorithm used by UNIX kernels.
+//
+// Note that sampling thread starvation could affect both (b) and (c).
+int os::loadavg(double loadavg[], int nelem) {
+return -1;
+}
+// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
+bool os::dont_yield() {
+return DontYieldALot;
+}
+// Is a (classpath) directory empty?
+bool os::dir_is_empty(const char* path) {
+WIN32_FIND_DATA fd;
+HANDLE f = FindFirstFile(path, &fd);
+if (f == INVALID_HANDLE_VALUE) {
+return true;
+}
+FindClose(f);
+return false;
+}
+// create binary file, rewriting existing file if required
+int os::create_binary_file(const char* path, bool rewrite_existing) {
+int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
+if (!rewrite_existing) {
+oflags |= _O_EXCL;
+}
+return ::open(path, oflags, _S_IREAD | _S_IWRITE);
+}
+// return current position of file pointer
+jlong os::current_file_offset(int fd) {
+return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
+}
+// move file pointer to the specified offset
+jlong os::seek_to_file_offset(int fd, jlong offset) {
+return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
+}
+// Map a block of memory.
+char* os::map_memory(int fd, const char* file_name, size_t file_offset,
+char *addr, size_t bytes, bool read_only,
+bool allow_exec) {
+HANDLE hFile;
+char* base;
+hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
+OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+if (hFile == NULL) {
+if (PrintMiscellaneous && Verbose) {
+DWORD err = GetLastError();
+tty->print_cr("CreateFile() failed: GetLastError->%ld.");
+}
+return NULL;
+}
+if (allow_exec) {
+// CreateFileMapping/MapViewOfFileEx can't map executable memory
+// unless it comes from a PE image (which the shared archive is not.)
+// Even VirtualProtect refuses to give execute access to mapped memory
+// that was not previously executable.
+//
+// Instead, stick the executable region in anonymous memory.  Yuck.
+// Penalty is that ~4 pages will not be shareable - in the future
+// we might consider DLLizing the shared archive with a proper PE
+// header so that mapping executable + sharing is possible.
+base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
+PAGE_READWRITE);
+if (base == NULL) {
+if (PrintMiscellaneous && Verbose) {
+DWORD err = GetLastError();
+tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
+}
+CloseHandle(hFile);
+return NULL;
+}
+DWORD bytes_read;
+OVERLAPPED overlapped;
+overlapped.Offset = (DWORD)file_offset;
+overlapped.OffsetHigh = 0;
+overlapped.hEvent = NULL;
+// ReadFile guarantees that if the return value is true, the requested
+// number of bytes were read before returning.
+bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
+if (!res) {
+if (PrintMiscellaneous && Verbose) {
+DWORD err = GetLastError();
+tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
+}
+release_memory(base, bytes);
+CloseHandle(hFile);
+return NULL;
+}
+} else {
+HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
+NULL /*file_name*/);
+if (hMap == NULL) {
+if (PrintMiscellaneous && Verbose) {
+DWORD err = GetLastError();
+tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
+}
+CloseHandle(hFile);
+return NULL;
+}
+DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
+base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
+(DWORD)bytes, addr);
+if (base == NULL) {
+if (PrintMiscellaneous && Verbose) {
+DWORD err = GetLastError();
+tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
+}
+CloseHandle(hMap);
+CloseHandle(hFile);
+return NULL;
+}
+if (CloseHandle(hMap) == 0) {
+if (PrintMiscellaneous && Verbose) {
+DWORD err = GetLastError();
+tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
+}
+CloseHandle(hFile);
+return base;
+}
+}
+if (allow_exec) {
+DWORD old_protect;
+DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
+bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
+if (!res) {
+if (PrintMiscellaneous && Verbose) {
+DWORD err = GetLastError();
+tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
+}
+// Don't consider this a hard error, on IA32 even if the
+// VirtualProtect fails, we should still be able to execute
+CloseHandle(hFile);
+return base;
+}
+}
+if (CloseHandle(hFile) == 0) {
+if (PrintMiscellaneous && Verbose) {
+DWORD err = GetLastError();
+tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
+}
+return base;
+}
+return base;
+}
+// Remap a block of memory.
+char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
+char *addr, size_t bytes, bool read_only,
+bool allow_exec) {
+// This OS does not allow existing memory maps to be remapped so we
+// have to unmap the memory before we remap it.
+if (!os::unmap_memory(addr, bytes)) {
+return NULL;
+}
+// There is a very small theoretical window between the unmap_memory()
+// call above and the map_memory() call below where a thread in native
+// code may be able to access an address that is no longer mapped.
+return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
+allow_exec);
+}
+// Unmap a block of memory.
+// Returns true=success, otherwise false.
+bool os::unmap_memory(char* addr, size_t bytes) {
+BOOL result = UnmapViewOfFile(addr);
+if (result == 0) {
+if (PrintMiscellaneous && Verbose) {
+DWORD err = GetLastError();
+tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
+}
+return false;
+}
+return true;
+}
+void os::pause() {
+char filename[MAX_PATH];
+if (PauseAtStartupFile && PauseAtStartupFile[0]) {
+jio_snprintf(filename, MAX_PATH, 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) {
+Sleep(100);
+}
+} else {
+jio_fprintf(stderr,
+"Could not open pause file '%s', continuing immediately.\n", filename);
+}
+}
+// An Event wraps a win32 "CreateEvent" kernel handle.
+//
+// We have a number of choices regarding "CreateEvent" win32 handle leakage:
+//
+// 1:  When a thread dies return the Event to the EventFreeList, clear the ParkHandle
+//     field, and call CloseHandle() on the win32 event handle.  Unpark() would
+//     need to be modified to tolerate finding a NULL (invalid) win32 event handle.
+//     In addition, an unpark() operation might fetch the handle field, but the
+//     event could recycle between the fetch and the SetEvent() operation.
+//     SetEvent() would either fail because the handle was invalid, or inadvertently work,
+//     as the win32 handle value had been recycled.  In an ideal world calling SetEvent()
+//     on an stale but recycled handle would be harmless, but in practice this might
+//     confuse other non-Sun code, so it's not a viable approach.
+//
+// 2:  Once a win32 event handle is associated with an Event, it remains associated
+//     with the Event.  The event handle is never closed.  This could be construed
+//     as handle leakage, but only up to the maximum # of threads that have been extant
+//     at any one time.  This shouldn't be an issue, as windows platforms typically
+//     permit a process to have hundreds of thousands of open handles.
+//
+// 3:  Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
+//     and release unused handles.
+//
+// 4:  Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
+//     It's not clear, however, that we wouldn't be trading one type of leak for another.
+//
+// 5.  Use an RCU-like mechanism (Read-Copy Update).
+//     Or perhaps something similar to Maged Michael's "Hazard pointers".
+//
+// We use (2).
+//
+// TODO-FIXME:
+// 1.  Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
+// 2.  Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
+//     to recover from (or at least detect) the dreaded Windows 841176 bug.
+// 3.  Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
+//     into a single win32 CreateEvent() handle.
+//
+// _Event transitions in park()
+//   -1 => -1 : illegal
+//    1 =>  0 : pass - return immediately
+//    0 => -1 : block
+//
+// _Event serves as a restricted-range semaphore :
+//    -1 : thread is blocked
+//     0 : neutral  - thread is running or ready
+//     1 : signaled - thread is running or ready
+//
+// Another possible encoding of _Event would be
+// with explicit "PARKED" and "SIGNALED" bits.
+int os::PlatformEvent::park (jlong Millis) {
+guarantee (_ParkHandle != NULL , "Invariant") ;
+guarantee (Millis > 0          , "Invariant") ;
+int v ;
+// CONSIDER: defer assigning a CreateEvent() handle to the Event until
+// the initial park() operation.
+for (;;) {
+v = _Event ;
+if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
+}
+guarantee ((v == 0) || (v == 1), "invariant") ;
+if (v != 0) return OS_OK ;
+// Do this the hard way by blocking ...
+// TODO: consider a brief spin here, gated on the success of recent
+// spin attempts by this thread.
+//
+// We decompose long timeouts into series of shorter timed waits.
+// Evidently large timo values passed in WaitForSingleObject() are problematic on some
+// versions of Windows.  See EventWait() for details.  This may be superstition.  Or not.
+// We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
+// with os::javaTimeNanos().  Furthermore, we assume that spurious returns from
+// ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
+// to happen early in the wait interval.  Specifically, after a spurious wakeup (rv ==
+// WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
+// for the already waited time.  This policy does not admit any new outcomes.
+// In the future, however, we might want to track the accumulated wait time and
+// adjust Millis accordingly if we encounter a spurious wakeup.
+const int MAXTIMEOUT = 0x10000000 ;
+DWORD rv = WAIT_TIMEOUT ;
+while (_Event < 0 && Millis > 0) {
+DWORD prd = Millis ;     // set prd = MAX (Millis, MAXTIMEOUT)
+if (Millis > MAXTIMEOUT) {
+prd = MAXTIMEOUT ;
+}
+rv = ::WaitForSingleObject (_ParkHandle, prd) ;
+assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
+if (rv == WAIT_TIMEOUT) {
+Millis -= prd ;
+}
+}
+v = _Event ;
+_Event = 0 ;
+OrderAccess::fence() ;
+// If we encounter a nearly simultanous timeout expiry and unpark()
+// we return OS_OK indicating we awoke via unpark().
+// Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
+return (v >= 0) ? OS_OK : OS_TIMEOUT ;
+}
+void os::PlatformEvent::park () {
+guarantee (_ParkHandle != NULL, "Invariant") ;
+// Invariant: Only the thread associated with the Event/PlatformEvent
+// may call park().
+int v ;
+for (;;) {
+v = _Event ;
+if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
+}
+guarantee ((v == 0) || (v == 1), "invariant") ;
+if (v != 0) return ;
+// Do this the hard way by blocking ...
+// TODO: consider a brief spin here, gated on the success of recent
+// spin attempts by this thread.
+while (_Event < 0) {
+DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
+assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
+}
+// Usually we'll find _Event == 0 at this point, but as
+// an optional optimization we clear it, just in case can
+// multiple unpark() operations drove _Event up to 1.
+_Event = 0 ;
+OrderAccess::fence() ;
+guarantee (_Event >= 0, "invariant") ;
+}
+void os::PlatformEvent::unpark() {
+guarantee (_ParkHandle != NULL, "Invariant") ;
+int v ;
+for (;;) {
+v = _Event ;      // Increment _Event if it's < 1.
+if (v > 0) {
+// If it's already signaled just return.
+// The LD of _Event could have reordered or be satisfied
+// by a read-aside from this processor's write buffer.
+// To avoid problems execute a barrier and then
+// ratify the value.  A degenerate CAS() would also work.
+// Viz., CAS (v+0, &_Event, v) == v).
+OrderAccess::fence() ;
+if (_Event == v) return ;
+continue ;
+}
+if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
+}
+if (v < 0) {
+::SetEvent (_ParkHandle) ;
+}
+}
+// JSR166
+// -------------------------------------------------------
+/*
+* The Windows implementation of Park is very straightforward: Basic
+* operations on Win32 Events turn out to have the right semantics to
+* use them directly. We opportunistically resuse the event inherited
+* from Monitor.
+*/
+void Parker::park(bool isAbsolute, jlong time) {
+guarantee (_ParkEvent != NULL, "invariant") ;
+// First, demultiplex/decode time arguments
+if (time < 0) { // don't wait
+return;
+}
+else if (time == 0) {
+time = INFINITE;
+}
+else if  (isAbsolute) {
+time -= os::javaTimeMillis(); // convert to relative time
+if (time <= 0) // already elapsed
+return;
+}
+else { // relative
+time /= 1000000; // Must coarsen from nanos to millis
+if (time == 0)   // Wait for the minimal time unit if zero
+time = 1;
+}
+JavaThread* thread = (JavaThread*)(Thread::current());
+assert(thread->is_Java_thread(), "Must be JavaThread");
+JavaThread *jt = (JavaThread *)thread;
+// Don't wait if interrupted or already triggered
+if (Thread::is_interrupted(thread, false) ||
+WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
+ResetEvent(_ParkEvent);
+return;
+}
+else {
+ThreadBlockInVM tbivm(jt);
+OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
+jt->set_suspend_equivalent();
+WaitForSingleObject(_ParkEvent,  time);
+ResetEvent(_ParkEvent);
+// If externally suspended while waiting, re-suspend
+if (jt->handle_special_suspend_equivalent_condition()) {
+jt->java_suspend_self();
+}
+}
+}
+void Parker::unpark() {
+guarantee (_ParkEvent != NULL, "invariant") ;
+SetEvent(_ParkEvent);
+}
+// Run the specified command in a separate process. Return its exit value,
+// or -1 on failure (e.g. can't create a new process).
+int os::fork_and_exec(char* cmd) {
+STARTUPINFO si;
+PROCESS_INFORMATION pi;
+memset(&si, 0, sizeof(si));
+si.cb = sizeof(si);
+memset(&pi, 0, sizeof(pi));
+BOOL rslt = CreateProcess(NULL,   // executable name - use command line
+cmd,    // command line
+NULL,   // process security attribute
+NULL,   // thread security attribute
+TRUE,   // inherits system handles
+0,      // no creation flags
+NULL,   // use parent's environment block
+NULL,   // use parent's starting directory
+&si,    // (in) startup information
+&pi);   // (out) process information
+if (rslt) {
+// Wait until child process exits.
+WaitForSingleObject(pi.hProcess, INFINITE);
+DWORD exit_code;
+GetExitCodeProcess(pi.hProcess, &exit_code);
+// Close process and thread handles.
+CloseHandle(pi.hProcess);
+CloseHandle(pi.hThread);
+return (int)exit_code;
+} else {
+return -1;
+}
+}
+//--------------------------------------------------------------------------------------------------
+// Non-product code
+static int mallocDebugIntervalCounter = 0;
+static int mallocDebugCounter = 0;
+bool os::check_heap(bool force) {
+if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
+if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
+// Note: HeapValidate executes two hardware breakpoints when it finds something
+// wrong; at these points, eax contains the address of the offending block (I think).
+// To get to the exlicit error message(s) below, just continue twice.
+HANDLE heap = GetProcessHeap();
+{ HeapLock(heap);
+PROCESS_HEAP_ENTRY phe;
+phe.lpData = NULL;
+while (HeapWalk(heap, &phe) != 0) {
+if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
+!HeapValidate(heap, 0, phe.lpData)) {
+tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
+tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
+fatal("corrupted C heap");
+}
+}
+int err = GetLastError();
+if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
+fatal1("heap walk aborted with error %d", err);
+}
+HeapUnlock(heap);
+}
+mallocDebugIntervalCounter = 0;
+}
+return true;
+}
+#ifndef PRODUCT
+bool os::find(address addr) {
+// Nothing yet
+return false;
+}
+#endif
+LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
+DWORD exception_code = e->ExceptionRecord->ExceptionCode;
+if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
+JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
+PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
+address addr = (address) exceptionRecord->ExceptionInformation[1];
+if (os::is_memory_serialize_page(thread, addr))
+return EXCEPTION_CONTINUE_EXECUTION;
+}
+return EXCEPTION_CONTINUE_SEARCH;
+}
+static int getLastErrorString(char *buf, size_t len)
+{
+long errval;
+if ((errval = GetLastError()) != 0)
+{
+/* DOS error */
+size_t n = (size_t)FormatMessage(
+FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
+NULL,
+errval,
+0,
+buf,
+(DWORD)len,
+NULL);
+if (n > 3) {
+/* Drop final '.', CR, LF */
+if (buf[n - 1] == '\n') n--;
+if (buf[n - 1] == '\r') n--;
+if (buf[n - 1] == '.') n--;
+buf[n] = '\0';
+}
+return (int)n;
+}
+if (errno != 0)
+{
+/* C runtime error that has no corresponding DOS error code */
+const char *s = strerror(errno);
+size_t n = strlen(s);
+if (n >= len) n = len - 1;
+strncpy(buf, s, n);
+buf[n] = '\0';
+return (int)n;
+}
+return 0;
+}

Mercurial > hg > graal-jvmci-8

comparison src/os/windows/vm/os_windows.cpp @ 0:a61af66fc99e jdk7-b24