jdk8-mips64-public/hotspot: src/os/windows/vm/os_windows.cpp@cd0742ba123c (annotated)

src/os/windows/vm/os_windows.cpp@cd0742ba123c (annotated)

src/os/windows/vm/os_windows.cpp

Thu, 20 Mar 2008 09:17:30 -0500

author: kamg
date: Thu, 20 Mar 2008 09:17:30 -0500
changeset 497: cd0742ba123c
parent 455: e195fe4c40c7
parent 496: 5a76ab815e34
child 514: 82db0859acbe
permissions: -rw-r--r--

Merge

 /*
  * 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) {
 #ifdef _LP64
   return size;
 #else
   // Limit to 1400m because of the 2gb address space wall
   return MIN2(size, (julong)1400*M);
 #endif
 }
 // 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::javaTimeMillis() {
   if (UseFakeTimers) {
     return fake_time++;
   } else {
     FILETIME wt;
     GetSystemTimeAsFileTime(&wt);
     return windows_to_java_time(wt);
   }
 }
 #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
 ,      // 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,
 ,
             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 > jdk8-mips64-public > hotspot / annotate

src/os/windows/vm/os_windows.cpp@cd0742ba123c (annotated)

src/os/windows/vm/os_windows.cpp