--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/os/windows/vm/os_windows.cpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,3872 @@
+/*
+ * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#ifdef _WIN64
+// Must be at least Windows 2000 or XP to use VectoredExceptions
+#define _WIN32_WINNT 0x500
+#endif
+
+// do not include precompiled header file
+# include "incls/_os_windows.cpp.incl"
+
+#ifdef _DEBUG
+#include <crtdbg.h>
+#endif
+
+
+#include <windows.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/timeb.h>
+#include <objidl.h>
+#include <shlobj.h>
+
+#include <malloc.h>
+#include <signal.h>
+#include <direct.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <io.h>
+#include <process.h> // For _beginthreadex(), _endthreadex()
+#include <imagehlp.h> // For os::dll_address_to_function_name
+
+/* for enumerating dll libraries */
+#include <tlhelp32.h>
+#include <vdmdbg.h>
+
+// for timer info max values which include all bits
+#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
+
+// For DLL loading/load error detection
+// Values of PE COFF
+#define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
+#define IMAGE_FILE_SIGNATURE_LENGTH 4
+
+static HANDLE main_process;
+static HANDLE main_thread;
+static int main_thread_id;
+
+static FILETIME process_creation_time;
+static FILETIME process_exit_time;
+static FILETIME process_user_time;
+static FILETIME process_kernel_time;
+
+#ifdef _WIN64
+PVOID topLevelVectoredExceptionHandler = NULL;
+#endif
+
+#ifdef _M_IA64
+#define __CPU__ ia64
+#elif _M_AMD64
+#define __CPU__ amd64
+#else
+#define __CPU__ i486
+#endif
+
+// save DLL module handle, used by GetModuleFileName
+
+HINSTANCE vm_lib_handle;
+static int getLastErrorString(char *buf, size_t len);
+
+BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
+ switch (reason) {
+ case DLL_PROCESS_ATTACH:
+ vm_lib_handle = hinst;
+ if(ForceTimeHighResolution)
+ timeBeginPeriod(1L);
+ break;
+ case DLL_PROCESS_DETACH:
+ if(ForceTimeHighResolution)
+ timeEndPeriod(1L);
+#ifdef _WIN64
+ if (topLevelVectoredExceptionHandler != NULL) {
+ RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
+ topLevelVectoredExceptionHandler = NULL;
+ }
+#endif
+ break;
+ default:
+ break;
+ }
+ return true;
+}
+
+static inline double fileTimeAsDouble(FILETIME* time) {
+ const double high = (double) ((unsigned int) ~0);
+ const double split = 10000000.0;
+ double result = (time->dwLowDateTime / split) +
+ time->dwHighDateTime * (high/split);
+ return result;
+}
+
+// Implementation of os
+
+bool os::getenv(const char* name, char* buffer, int len) {
+ int result = GetEnvironmentVariable(name, buffer, len);
+ return result > 0 && result < len;
+}
+
+
+// No setuid programs under Windows.
+bool os::have_special_privileges() {
+ return false;
+}
+
+
+// This method is a periodic task to check for misbehaving JNI applications
+// under CheckJNI, we can add any periodic checks here.
+// For Windows at the moment does nothing
+void os::run_periodic_checks() {
+ return;
+}
+
+#ifndef _WIN64
+LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
+#endif
+void os::init_system_properties_values() {
+ /* sysclasspath, java_home, dll_dir */
+ {
+ char *home_path;
+ char *dll_path;
+ char *pslash;
+ char *bin = "\\bin";
+ char home_dir[MAX_PATH];
+
+ if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
+ os::jvm_path(home_dir, sizeof(home_dir));
+ // Found the full path to jvm[_g].dll.
+ // Now cut the path to <java_home>/jre if we can.
+ *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
+ pslash = strrchr(home_dir, '\\');
+ if (pslash != NULL) {
+ *pslash = '\0'; /* get rid of \{client|server} */
+ pslash = strrchr(home_dir, '\\');
+ if (pslash != NULL)
+ *pslash = '\0'; /* get rid of \bin */
+ }
+ }
+
+ home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1);
+ if (home_path == NULL)
+ return;
+ strcpy(home_path, home_dir);
+ Arguments::set_java_home(home_path);
+
+ dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1);
+ if (dll_path == NULL)
+ return;
+ strcpy(dll_path, home_dir);
+ strcat(dll_path, bin);
+ Arguments::set_dll_dir(dll_path);
+
+ if (!set_boot_path('\\', ';'))
+ return;
+ }
+
+ /* library_path */
+ #define EXT_DIR "\\lib\\ext"
+ #define BIN_DIR "\\bin"
+ #define PACKAGE_DIR "\\Sun\\Java"
+ {
+ /* Win32 library search order (See the documentation for LoadLibrary):
+ *
+ * 1. The directory from which application is loaded.
+ * 2. The current directory
+ * 3. The system wide Java Extensions directory (Java only)
+ * 4. System directory (GetSystemDirectory)
+ * 5. Windows directory (GetWindowsDirectory)
+ * 6. The PATH environment variable
+ */
+
+ char *library_path;
+ char tmp[MAX_PATH];
+ char *path_str = ::getenv("PATH");
+
+ library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
+ sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10);
+
+ library_path[0] = '\0';
+
+ GetModuleFileName(NULL, tmp, sizeof(tmp));
+ *(strrchr(tmp, '\\')) = '\0';
+ strcat(library_path, tmp);
+
+ strcat(library_path, ";.");
+
+ GetWindowsDirectory(tmp, sizeof(tmp));
+ strcat(library_path, ";");
+ strcat(library_path, tmp);
+ strcat(library_path, PACKAGE_DIR BIN_DIR);
+
+ GetSystemDirectory(tmp, sizeof(tmp));
+ strcat(library_path, ";");
+ strcat(library_path, tmp);
+
+ GetWindowsDirectory(tmp, sizeof(tmp));
+ strcat(library_path, ";");
+ strcat(library_path, tmp);
+
+ if (path_str) {
+ strcat(library_path, ";");
+ strcat(library_path, path_str);
+ }
+
+ Arguments::set_library_path(library_path);
+ FREE_C_HEAP_ARRAY(char, library_path);
+ }
+
+ /* Default extensions directory */
+ {
+ char path[MAX_PATH];
+ char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
+ GetWindowsDirectory(path, MAX_PATH);
+ sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
+ path, PACKAGE_DIR, EXT_DIR);
+ Arguments::set_ext_dirs(buf);
+ }
+ #undef EXT_DIR
+ #undef BIN_DIR
+ #undef PACKAGE_DIR
+
+ /* Default endorsed standards directory. */
+ {
+ #define ENDORSED_DIR "\\lib\\endorsed"
+ size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
+ char * buf = NEW_C_HEAP_ARRAY(char, len);
+ sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
+ Arguments::set_endorsed_dirs(buf);
+ #undef ENDORSED_DIR
+ }
+
+#ifndef _WIN64
+ SetUnhandledExceptionFilter(Handle_FLT_Exception);
+#endif
+
+ // Done
+ return;
+}
+
+void os::breakpoint() {
+ DebugBreak();
+}
+
+// Invoked from the BREAKPOINT Macro
+extern "C" void breakpoint() {
+ os::breakpoint();
+}
+
+// Returns an estimate of the current stack pointer. Result must be guaranteed
+// to point into the calling threads stack, and be no lower than the current
+// stack pointer.
+
+address os::current_stack_pointer() {
+ int dummy;
+ address sp = (address)&dummy;
+ return sp;
+}
+
+// os::current_stack_base()
+//
+// Returns the base of the stack, which is the stack's
+// starting address. This function must be called
+// while running on the stack of the thread being queried.
+
+address os::current_stack_base() {
+ MEMORY_BASIC_INFORMATION minfo;
+ address stack_bottom;
+ size_t stack_size;
+
+ VirtualQuery(&minfo, &minfo, sizeof(minfo));
+ stack_bottom = (address)minfo.AllocationBase;
+ stack_size = minfo.RegionSize;
+
+ // Add up the sizes of all the regions with the same
+ // AllocationBase.
+ while( 1 )
+ {
+ VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
+ if ( stack_bottom == (address)minfo.AllocationBase )
+ stack_size += minfo.RegionSize;
+ else
+ break;
+ }
+
+#ifdef _M_IA64
+ // IA64 has memory and register stacks
+ stack_size = stack_size / 2;
+#endif
+ return stack_bottom + stack_size;
+}
+
+size_t os::current_stack_size() {
+ size_t sz;
+ MEMORY_BASIC_INFORMATION minfo;
+ VirtualQuery(&minfo, &minfo, sizeof(minfo));
+ sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
+ return sz;
+}
+
+
+LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
+
+// Thread start routine for all new Java threads
+static unsigned __stdcall java_start(Thread* thread) {
+ // Try to randomize the cache line index of hot stack frames.
+ // This helps when threads of the same stack traces evict each other's
+ // cache lines. The threads can be either from the same JVM instance, or
+ // from different JVM instances. The benefit is especially true for
+ // processors with hyperthreading technology.
+ static int counter = 0;
+ int pid = os::current_process_id();
+ _alloca(((pid ^ counter++) & 7) * 128);
+
+ OSThread* osthr = thread->osthread();
+ assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
+
+ if (UseNUMA) {
+ int lgrp_id = os::numa_get_group_id();
+ if (lgrp_id != -1) {
+ thread->set_lgrp_id(lgrp_id);
+ }
+ }
+
+
+ if (UseVectoredExceptions) {
+ // If we are using vectored exception we don't need to set a SEH
+ thread->run();
+ }
+ else {
+ // Install a win32 structured exception handler around every thread created
+ // by VM, so VM can genrate error dump when an exception occurred in non-
+ // Java thread (e.g. VM thread).
+ __try {
+ thread->run();
+ } __except(topLevelExceptionFilter(
+ (_EXCEPTION_POINTERS*)_exception_info())) {
+ // Nothing to do.
+ }
+ }
+
+ // One less thread is executing
+ // When the VMThread gets here, the main thread may have already exited
+ // which frees the CodeHeap containing the Atomic::add code
+ if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
+ Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
+ }
+
+ return 0;
+}
+
+static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
+ // Allocate the OSThread object
+ OSThread* osthread = new OSThread(NULL, NULL);
+ if (osthread == NULL) return NULL;
+
+ // Initialize support for Java interrupts
+ HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
+ if (interrupt_event == NULL) {
+ delete osthread;
+ return NULL;
+ }
+ osthread->set_interrupt_event(interrupt_event);
+
+ // Store info on the Win32 thread into the OSThread
+ osthread->set_thread_handle(thread_handle);
+ osthread->set_thread_id(thread_id);
+
+ if (UseNUMA) {
+ int lgrp_id = os::numa_get_group_id();
+ if (lgrp_id != -1) {
+ thread->set_lgrp_id(lgrp_id);
+ }
+ }
+
+ // Initial thread state is INITIALIZED, not SUSPENDED
+ osthread->set_state(INITIALIZED);
+
+ return osthread;
+}
+
+
+bool os::create_attached_thread(JavaThread* thread) {
+#ifdef ASSERT
+ thread->verify_not_published();
+#endif
+ HANDLE thread_h;
+ if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
+ &thread_h, THREAD_ALL_ACCESS, false, 0)) {
+ fatal("DuplicateHandle failed\n");
+ }
+ OSThread* osthread = create_os_thread(thread, thread_h,
+ (int)current_thread_id());
+ if (osthread == NULL) {
+ return false;
+ }
+
+ // Initial thread state is RUNNABLE
+ osthread->set_state(RUNNABLE);
+
+ thread->set_osthread(osthread);
+ return true;
+}
+
+bool os::create_main_thread(JavaThread* thread) {
+#ifdef ASSERT
+ thread->verify_not_published();
+#endif
+ if (_starting_thread == NULL) {
+ _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
+ if (_starting_thread == NULL) {
+ return false;
+ }
+ }
+
+ // The primordial thread is runnable from the start)
+ _starting_thread->set_state(RUNNABLE);
+
+ thread->set_osthread(_starting_thread);
+ return true;
+}
+
+// Allocate and initialize a new OSThread
+bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
+ unsigned thread_id;
+
+ // Allocate the OSThread object
+ OSThread* osthread = new OSThread(NULL, NULL);
+ if (osthread == NULL) {
+ return false;
+ }
+
+ // Initialize support for Java interrupts
+ HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
+ if (interrupt_event == NULL) {
+ delete osthread;
+ return NULL;
+ }
+ osthread->set_interrupt_event(interrupt_event);
+ osthread->set_interrupted(false);
+
+ thread->set_osthread(osthread);
+
+ if (stack_size == 0) {
+ switch (thr_type) {
+ case os::java_thread:
+ // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
+ if (JavaThread::stack_size_at_create() > 0)
+ stack_size = JavaThread::stack_size_at_create();
+ break;
+ case os::compiler_thread:
+ if (CompilerThreadStackSize > 0) {
+ stack_size = (size_t)(CompilerThreadStackSize * K);
+ break;
+ } // else fall through:
+ // use VMThreadStackSize if CompilerThreadStackSize is not defined
+ case os::vm_thread:
+ case os::pgc_thread:
+ case os::cgc_thread:
+ case os::watcher_thread:
+ if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
+ break;
+ }
+ }
+
+ // Create the Win32 thread
+ //
+ // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
+ // does not specify stack size. Instead, it specifies the size of
+ // initially committed space. The stack size is determined by
+ // PE header in the executable. If the committed "stack_size" is larger
+ // than default value in the PE header, the stack is rounded up to the
+ // nearest multiple of 1MB. For example if the launcher has default
+ // stack size of 320k, specifying any size less than 320k does not
+ // affect the actual stack size at all, it only affects the initial
+ // commitment. On the other hand, specifying 'stack_size' larger than
+ // default value may cause significant increase in memory usage, because
+ // not only the stack space will be rounded up to MB, but also the
+ // entire space is committed upfront.
+ //
+ // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
+ // for CreateThread() that can treat 'stack_size' as stack size. However we
+ // are not supposed to call CreateThread() directly according to MSDN
+ // document because JVM uses C runtime library. The good news is that the
+ // flag appears to work with _beginthredex() as well.
+
+#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
+#define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
+#endif
+
+ HANDLE thread_handle =
+ (HANDLE)_beginthreadex(NULL,
+ (unsigned)stack_size,
+ (unsigned (__stdcall *)(void*)) java_start,
+ thread,
+ CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
+ &thread_id);
+ if (thread_handle == NULL) {
+ // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
+ // without the flag.
+ thread_handle =
+ (HANDLE)_beginthreadex(NULL,
+ (unsigned)stack_size,
+ (unsigned (__stdcall *)(void*)) java_start,
+ thread,
+ CREATE_SUSPENDED,
+ &thread_id);
+ }
+ if (thread_handle == NULL) {
+ // Need to clean up stuff we've allocated so far
+ CloseHandle(osthread->interrupt_event());
+ thread->set_osthread(NULL);
+ delete osthread;
+ return NULL;
+ }
+
+ Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
+
+ // Store info on the Win32 thread into the OSThread
+ osthread->set_thread_handle(thread_handle);
+ osthread->set_thread_id(thread_id);
+
+ // Initial thread state is INITIALIZED, not SUSPENDED
+ osthread->set_state(INITIALIZED);
+
+ // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
+ return true;
+}
+
+
+// Free Win32 resources related to the OSThread
+void os::free_thread(OSThread* osthread) {
+ assert(osthread != NULL, "osthread not set");
+ CloseHandle(osthread->thread_handle());
+ CloseHandle(osthread->interrupt_event());
+ delete osthread;
+}
+
+
+static int has_performance_count = 0;
+static jlong first_filetime;
+static jlong initial_performance_count;
+static jlong performance_frequency;
+
+
+jlong as_long(LARGE_INTEGER x) {
+ jlong result = 0; // initialization to avoid warning
+ set_high(&result, x.HighPart);
+ set_low(&result, x.LowPart);
+ return result;
+}
+
+
+jlong os::elapsed_counter() {
+ LARGE_INTEGER count;
+ if (has_performance_count) {
+ QueryPerformanceCounter(&count);
+ return as_long(count) - initial_performance_count;
+ } else {
+ FILETIME wt;
+ GetSystemTimeAsFileTime(&wt);
+ return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
+ }
+}
+
+
+jlong os::elapsed_frequency() {
+ if (has_performance_count) {
+ return performance_frequency;
+ } else {
+ // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
+ return 10000000;
+ }
+}
+
+
+julong os::available_memory() {
+ return win32::available_memory();
+}
+
+julong os::win32::available_memory() {
+ // FIXME: GlobalMemoryStatus() may return incorrect value if total memory
+ // is larger than 4GB
+ MEMORYSTATUS ms;
+ GlobalMemoryStatus(&ms);
+
+ return (julong)ms.dwAvailPhys;
+}
+
+julong os::physical_memory() {
+ return win32::physical_memory();
+}
+
+julong os::allocatable_physical_memory(julong size) {
+ return MIN2(size, (julong)1400*M);
+}
+
+// VC6 lacks DWORD_PTR
+#if _MSC_VER < 1300
+typedef UINT_PTR DWORD_PTR;
+#endif
+
+int os::active_processor_count() {
+ DWORD_PTR lpProcessAffinityMask = 0;
+ DWORD_PTR lpSystemAffinityMask = 0;
+ int proc_count = processor_count();
+ if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
+ GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
+ // Nof active processors is number of bits in process affinity mask
+ int bitcount = 0;
+ while (lpProcessAffinityMask != 0) {
+ lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
+ bitcount++;
+ }
+ return bitcount;
+ } else {
+ return proc_count;
+ }
+}
+
+bool os::distribute_processes(uint length, uint* distribution) {
+ // Not yet implemented.
+ return false;
+}
+
+bool os::bind_to_processor(uint processor_id) {
+ // Not yet implemented.
+ return false;
+}
+
+static void initialize_performance_counter() {
+ LARGE_INTEGER count;
+ if (QueryPerformanceFrequency(&count)) {
+ has_performance_count = 1;
+ performance_frequency = as_long(count);
+ QueryPerformanceCounter(&count);
+ initial_performance_count = as_long(count);
+ } else {
+ has_performance_count = 0;
+ FILETIME wt;
+ GetSystemTimeAsFileTime(&wt);
+ first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
+ }
+}
+
+
+double os::elapsedTime() {
+ return (double) elapsed_counter() / (double) elapsed_frequency();
+}
+
+
+// Windows format:
+// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
+// Java format:
+// Java standards require the number of milliseconds since 1/1/1970
+
+// Constant offset - calculated using offset()
+static jlong _offset = 116444736000000000;
+// Fake time counter for reproducible results when debugging
+static jlong fake_time = 0;
+
+#ifdef ASSERT
+// Just to be safe, recalculate the offset in debug mode
+static jlong _calculated_offset = 0;
+static int _has_calculated_offset = 0;
+
+jlong offset() {
+ if (_has_calculated_offset) return _calculated_offset;
+ SYSTEMTIME java_origin;
+ java_origin.wYear = 1970;
+ java_origin.wMonth = 1;
+ java_origin.wDayOfWeek = 0; // ignored
+ java_origin.wDay = 1;
+ java_origin.wHour = 0;
+ java_origin.wMinute = 0;
+ java_origin.wSecond = 0;
+ java_origin.wMilliseconds = 0;
+ FILETIME jot;
+ if (!SystemTimeToFileTime(&java_origin, &jot)) {
+ fatal1("Error = %d\nWindows error", GetLastError());
+ }
+ _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
+ _has_calculated_offset = 1;
+ assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
+ return _calculated_offset;
+}
+#else
+jlong offset() {
+ return _offset;
+}
+#endif
+
+jlong windows_to_java_time(FILETIME wt) {
+ jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
+ return (a - offset()) / 10000;
+}
+
+FILETIME java_to_windows_time(jlong l) {
+ jlong a = (l * 10000) + offset();
+ FILETIME result;
+ result.dwHighDateTime = high(a);
+ result.dwLowDateTime = low(a);
+ return result;
+}
+
+jlong os::timeofday() {
+ FILETIME wt;
+ GetSystemTimeAsFileTime(&wt);
+ return windows_to_java_time(wt);
+}
+
+
+// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
+// _use_global_time is only set if CacheTimeMillis is true
+jlong os::javaTimeMillis() {
+ if (UseFakeTimers) {
+ return fake_time++;
+ } else {
+ return (_use_global_time ? read_global_time() : timeofday());
+ }
+}
+
+#define NANOS_PER_SEC CONST64(1000000000)
+#define NANOS_PER_MILLISEC 1000000
+jlong os::javaTimeNanos() {
+ if (!has_performance_count) {
+ return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do.
+ } else {
+ LARGE_INTEGER current_count;
+ QueryPerformanceCounter(¤t_count);
+ double current = as_long(current_count);
+ double freq = performance_frequency;
+ jlong time = (jlong)((current/freq) * NANOS_PER_SEC);
+ return time;
+ }
+}
+
+void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
+ if (!has_performance_count) {
+ // javaTimeMillis() doesn't have much percision,
+ // but it is not going to wrap -- so all 64 bits
+ info_ptr->max_value = ALL_64_BITS;
+
+ // this is a wall clock timer, so may skip
+ info_ptr->may_skip_backward = true;
+ info_ptr->may_skip_forward = true;
+ } else {
+ jlong freq = performance_frequency;
+ if (freq < NANOS_PER_SEC) {
+ // the performance counter is 64 bits and we will
+ // be multiplying it -- so no wrap in 64 bits
+ info_ptr->max_value = ALL_64_BITS;
+ } else if (freq > NANOS_PER_SEC) {
+ // use the max value the counter can reach to
+ // determine the max value which could be returned
+ julong max_counter = (julong)ALL_64_BITS;
+ info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC));
+ } else {
+ // the performance counter is 64 bits and we will
+ // be using it directly -- so no wrap in 64 bits
+ info_ptr->max_value = ALL_64_BITS;
+ }
+
+ // using a counter, so no skipping
+ info_ptr->may_skip_backward = false;
+ info_ptr->may_skip_forward = false;
+ }
+ info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
+}
+
+char* os::local_time_string(char *buf, size_t buflen) {
+ SYSTEMTIME st;
+ GetLocalTime(&st);
+ jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
+ st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
+ return buf;
+}
+
+bool os::getTimesSecs(double* process_real_time,
+ double* process_user_time,
+ double* process_system_time) {
+ HANDLE h_process = GetCurrentProcess();
+ FILETIME create_time, exit_time, kernel_time, user_time;
+ BOOL result = GetProcessTimes(h_process,
+ &create_time,
+ &exit_time,
+ &kernel_time,
+ &user_time);
+ if (result != 0) {
+ FILETIME wt;
+ GetSystemTimeAsFileTime(&wt);
+ jlong rtc_millis = windows_to_java_time(wt);
+ jlong user_millis = windows_to_java_time(user_time);
+ jlong system_millis = windows_to_java_time(kernel_time);
+ *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
+ *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
+ *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
+ return true;
+ } else {
+ return false;
+ }
+}
+
+void os::shutdown() {
+
+ // allow PerfMemory to attempt cleanup of any persistent resources
+ perfMemory_exit();
+
+ // flush buffered output, finish log files
+ ostream_abort();
+
+ // Check for abort hook
+ abort_hook_t abort_hook = Arguments::abort_hook();
+ if (abort_hook != NULL) {
+ abort_hook();
+ }
+}
+
+void os::abort(bool dump_core)
+{
+ os::shutdown();
+ // no core dump on Windows
+ ::exit(1);
+}
+
+// Die immediately, no exit hook, no abort hook, no cleanup.
+void os::die() {
+ _exit(-1);
+}
+
+// Directory routines copied from src/win32/native/java/io/dirent_md.c
+// * dirent_md.c 1.15 00/02/02
+//
+// The declarations for DIR and struct dirent are in jvm_win32.h.
+
+/* Caller must have already run dirname through JVM_NativePath, which removes
+ duplicate slashes and converts all instances of '/' into '\\'. */
+
+DIR *
+os::opendir(const char *dirname)
+{
+ assert(dirname != NULL, "just checking"); // hotspot change
+ DIR *dirp = (DIR *)malloc(sizeof(DIR));
+ DWORD fattr; // hotspot change
+ char alt_dirname[4] = { 0, 0, 0, 0 };
+
+ if (dirp == 0) {
+ errno = ENOMEM;
+ return 0;
+ }
+
+ /*
+ * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
+ * as a directory in FindFirstFile(). We detect this case here and
+ * prepend the current drive name.
+ */
+ if (dirname[1] == '\0' && dirname[0] == '\\') {
+ alt_dirname[0] = _getdrive() + 'A' - 1;
+ alt_dirname[1] = ':';
+ alt_dirname[2] = '\\';
+ alt_dirname[3] = '\0';
+ dirname = alt_dirname;
+ }
+
+ dirp->path = (char *)malloc(strlen(dirname) + 5);
+ if (dirp->path == 0) {
+ free(dirp);
+ errno = ENOMEM;
+ return 0;
+ }
+ strcpy(dirp->path, dirname);
+
+ fattr = GetFileAttributes(dirp->path);
+ if (fattr == 0xffffffff) {
+ free(dirp->path);
+ free(dirp);
+ errno = ENOENT;
+ return 0;
+ } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
+ free(dirp->path);
+ free(dirp);
+ errno = ENOTDIR;
+ return 0;
+ }
+
+ /* Append "*.*", or possibly "\\*.*", to path */
+ if (dirp->path[1] == ':'
+ && (dirp->path[2] == '\0'
+ || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
+ /* No '\\' needed for cases like "Z:" or "Z:\" */
+ strcat(dirp->path, "*.*");
+ } else {
+ strcat(dirp->path, "\\*.*");
+ }
+
+ dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
+ if (dirp->handle == INVALID_HANDLE_VALUE) {
+ if (GetLastError() != ERROR_FILE_NOT_FOUND) {
+ free(dirp->path);
+ free(dirp);
+ errno = EACCES;
+ return 0;
+ }
+ }
+ return dirp;
+}
+
+/* parameter dbuf unused on Windows */
+
+struct dirent *
+os::readdir(DIR *dirp, dirent *dbuf)
+{
+ assert(dirp != NULL, "just checking"); // hotspot change
+ if (dirp->handle == INVALID_HANDLE_VALUE) {
+ return 0;
+ }
+
+ strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
+
+ if (!FindNextFile(dirp->handle, &dirp->find_data)) {
+ if (GetLastError() == ERROR_INVALID_HANDLE) {
+ errno = EBADF;
+ return 0;
+ }
+ FindClose(dirp->handle);
+ dirp->handle = INVALID_HANDLE_VALUE;
+ }
+
+ return &dirp->dirent;
+}
+
+int
+os::closedir(DIR *dirp)
+{
+ assert(dirp != NULL, "just checking"); // hotspot change
+ if (dirp->handle != INVALID_HANDLE_VALUE) {
+ if (!FindClose(dirp->handle)) {
+ errno = EBADF;
+ return -1;
+ }
+ dirp->handle = INVALID_HANDLE_VALUE;
+ }
+ free(dirp->path);
+ free(dirp);
+ return 0;
+}
+
+const char* os::dll_file_extension() { return ".dll"; }
+
+const char * os::get_temp_directory()
+{
+ static char path_buf[MAX_PATH];
+ if (GetTempPath(MAX_PATH, path_buf)>0)
+ return path_buf;
+ else{
+ path_buf[0]='\0';
+ return path_buf;
+ }
+}
+
+// Needs to be in os specific directory because windows requires another
+// header file <direct.h>
+const char* os::get_current_directory(char *buf, int buflen) {
+ return _getcwd(buf, buflen);
+}
+
+//-----------------------------------------------------------
+// Helper functions for fatal error handler
+
+// The following library functions are resolved dynamically at runtime:
+
+// PSAPI functions, for Windows NT, 2000, XP
+
+// psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
+// SDK from Microsoft. Here are the definitions copied from psapi.h
+typedef struct _MODULEINFO {
+ LPVOID lpBaseOfDll;
+ DWORD SizeOfImage;
+ LPVOID EntryPoint;
+} MODULEINFO, *LPMODULEINFO;
+
+static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD );
+static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
+static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
+
+// ToolHelp Functions, for Windows 95, 98 and ME
+
+static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
+static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ;
+static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ;
+
+bool _has_psapi;
+bool _psapi_init = false;
+bool _has_toolhelp;
+
+static bool _init_psapi() {
+ HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
+ if( psapi == NULL ) return false ;
+
+ _EnumProcessModules = CAST_TO_FN_PTR(
+ BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
+ GetProcAddress(psapi, "EnumProcessModules")) ;
+ _GetModuleFileNameEx = CAST_TO_FN_PTR(
+ DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
+ GetProcAddress(psapi, "GetModuleFileNameExA"));
+ _GetModuleInformation = CAST_TO_FN_PTR(
+ BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
+ GetProcAddress(psapi, "GetModuleInformation"));
+
+ _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
+ _psapi_init = true;
+ return _has_psapi;
+}
+
+static bool _init_toolhelp() {
+ HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
+ if (kernel32 == NULL) return false ;
+
+ _CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
+ HANDLE(WINAPI *)(DWORD,DWORD),
+ GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
+ _Module32First = CAST_TO_FN_PTR(
+ BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
+ GetProcAddress(kernel32, "Module32First" ));
+ _Module32Next = CAST_TO_FN_PTR(
+ BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
+ GetProcAddress(kernel32, "Module32Next" ));
+
+ _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
+ return _has_toolhelp;
+}
+
+#ifdef _WIN64
+// Helper routine which returns true if address in
+// within the NTDLL address space.
+//
+static bool _addr_in_ntdll( address addr )
+{
+ HMODULE hmod;
+ MODULEINFO minfo;
+
+ hmod = GetModuleHandle("NTDLL.DLL");
+ if ( hmod == NULL ) return false;
+ if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
+ &minfo, sizeof(MODULEINFO)) )
+ return false;
+
+ if ( (addr >= minfo.lpBaseOfDll) &&
+ (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
+ return true;
+ else
+ return false;
+}
+#endif
+
+
+// Enumerate all modules for a given process ID
+//
+// Notice that Windows 95/98/Me and Windows NT/2000/XP have
+// different API for doing this. We use PSAPI.DLL on NT based
+// Windows and ToolHelp on 95/98/Me.
+
+// Callback function that is called by enumerate_modules() on
+// every DLL module.
+// Input parameters:
+// int pid,
+// char* module_file_name,
+// address module_base_addr,
+// unsigned module_size,
+// void* param
+typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
+
+// enumerate_modules for Windows NT, using PSAPI
+static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
+{
+ HANDLE hProcess ;
+
+# define MAX_NUM_MODULES 128
+ HMODULE modules[MAX_NUM_MODULES];
+ static char filename[ MAX_PATH ];
+ int result = 0;
+
+ if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
+
+ hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
+ FALSE, pid ) ;
+ if (hProcess == NULL) return 0;
+
+ DWORD size_needed;
+ if (!_EnumProcessModules(hProcess, modules,
+ sizeof(modules), &size_needed)) {
+ CloseHandle( hProcess );
+ return 0;
+ }
+
+ // number of modules that are currently loaded
+ int num_modules = size_needed / sizeof(HMODULE);
+
+ for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
+ // Get Full pathname:
+ if(!_GetModuleFileNameEx(hProcess, modules[i],
+ filename, sizeof(filename))) {
+ filename[0] = '\0';
+ }
+
+ MODULEINFO modinfo;
+ if (!_GetModuleInformation(hProcess, modules[i],
+ &modinfo, sizeof(modinfo))) {
+ modinfo.lpBaseOfDll = NULL;
+ modinfo.SizeOfImage = 0;
+ }
+
+ // Invoke callback function
+ result = func(pid, filename, (address)modinfo.lpBaseOfDll,
+ modinfo.SizeOfImage, param);
+ if (result) break;
+ }
+
+ CloseHandle( hProcess ) ;
+ return result;
+}
+
+
+// enumerate_modules for Windows 95/98/ME, using TOOLHELP
+static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
+{
+ HANDLE hSnapShot ;
+ static MODULEENTRY32 modentry ;
+ int result = 0;
+
+ if (!_has_toolhelp) return 0;
+
+ // Get a handle to a Toolhelp snapshot of the system
+ hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
+ if( hSnapShot == INVALID_HANDLE_VALUE ) {
+ return FALSE ;
+ }
+
+ // iterate through all modules
+ modentry.dwSize = sizeof(MODULEENTRY32) ;
+ bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
+
+ while( not_done ) {
+ // invoke the callback
+ result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
+ modentry.modBaseSize, param);
+ if (result) break;
+
+ modentry.dwSize = sizeof(MODULEENTRY32) ;
+ not_done = _Module32Next( hSnapShot, &modentry ) != 0;
+ }
+
+ CloseHandle(hSnapShot);
+ return result;
+}
+
+int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
+{
+ // Get current process ID if caller doesn't provide it.
+ if (!pid) pid = os::current_process_id();
+
+ if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
+ else return _enumerate_modules_windows(pid, func, param);
+}
+
+struct _modinfo {
+ address addr;
+ char* full_path; // point to a char buffer
+ int buflen; // size of the buffer
+ address base_addr;
+};
+
+static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
+ unsigned size, void * param) {
+ struct _modinfo *pmod = (struct _modinfo *)param;
+ if (!pmod) return -1;
+
+ if (base_addr <= pmod->addr &&
+ base_addr+size > pmod->addr) {
+ // if a buffer is provided, copy path name to the buffer
+ if (pmod->full_path) {
+ jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
+ }
+ pmod->base_addr = base_addr;
+ return 1;
+ }
+ return 0;
+}
+
+bool os::dll_address_to_library_name(address addr, char* buf,
+ int buflen, int* offset) {
+// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
+// return the full path to the DLL file, sometimes it returns path
+// to the corresponding PDB file (debug info); sometimes it only
+// returns partial path, which makes life painful.
+
+ struct _modinfo mi;
+ mi.addr = addr;
+ mi.full_path = buf;
+ mi.buflen = buflen;
+ int pid = os::current_process_id();
+ if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
+ // buf already contains path name
+ if (offset) *offset = addr - mi.base_addr;
+ return true;
+ } else {
+ if (buf) buf[0] = '\0';
+ if (offset) *offset = -1;
+ return false;
+ }
+}
+
+bool os::dll_address_to_function_name(address addr, char *buf,
+ int buflen, int *offset) {
+ // Unimplemented on Windows - in order to use SymGetSymFromAddr(),
+ // we need to initialize imagehlp/dbghelp, then load symbol table
+ // for every module. That's too much work to do after a fatal error.
+ // For an example on how to implement this function, see 1.4.2.
+ if (offset) *offset = -1;
+ if (buf) buf[0] = '\0';
+ return false;
+}
+
+// save the start and end address of jvm.dll into param[0] and param[1]
+static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
+ unsigned size, void * param) {
+ if (!param) return -1;
+
+ if (base_addr <= (address)_locate_jvm_dll &&
+ base_addr+size > (address)_locate_jvm_dll) {
+ ((address*)param)[0] = base_addr;
+ ((address*)param)[1] = base_addr + size;
+ return 1;
+ }
+ return 0;
+}
+
+address vm_lib_location[2]; // start and end address of jvm.dll
+
+// check if addr is inside jvm.dll
+bool os::address_is_in_vm(address addr) {
+ if (!vm_lib_location[0] || !vm_lib_location[1]) {
+ int pid = os::current_process_id();
+ if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
+ assert(false, "Can't find jvm module.");
+ return false;
+ }
+ }
+
+ return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
+}
+
+// print module info; param is outputStream*
+static int _print_module(int pid, char* fname, address base,
+ unsigned size, void* param) {
+ if (!param) return -1;
+
+ outputStream* st = (outputStream*)param;
+
+ address end_addr = base + size;
+ st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
+ return 0;
+}
+
+// Loads .dll/.so and
+// in case of error it checks if .dll/.so was built for the
+// same architecture as Hotspot is running on
+void * os::dll_load(const char *name, char *ebuf, int ebuflen)
+{
+ void * result = LoadLibrary(name);
+ if (result != NULL)
+ {
+ return result;
+ }
+
+ long errcode = GetLastError();
+ if (errcode == ERROR_MOD_NOT_FOUND) {
+ strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
+ ebuf[ebuflen-1]='\0';
+ return NULL;
+ }
+
+ // Parsing dll below
+ // If we can read dll-info and find that dll was built
+ // for an architecture other than Hotspot is running in
+ // - then print to buffer "DLL was built for a different architecture"
+ // else call getLastErrorString to obtain system error message
+
+ // Read system error message into ebuf
+ // It may or may not be overwritten below (in the for loop and just above)
+ getLastErrorString(ebuf, (size_t) ebuflen);
+ ebuf[ebuflen-1]='\0';
+ int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
+ if (file_descriptor<0)
+ {
+ return NULL;
+ }
+
+ uint32_t signature_offset;
+ uint16_t lib_arch=0;
+ bool failed_to_get_lib_arch=
+ (
+ //Go to position 3c in the dll
+ (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
+ ||
+ // Read loacation of signature
+ (sizeof(signature_offset)!=
+ (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
+ ||
+ //Go to COFF File Header in dll
+ //that is located after"signature" (4 bytes long)
+ (os::seek_to_file_offset(file_descriptor,
+ signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
+ ||
+ //Read field that contains code of architecture
+ // that dll was build for
+ (sizeof(lib_arch)!=
+ (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
+ );
+
+ ::close(file_descriptor);
+ if (failed_to_get_lib_arch)
+ {
+ // file i/o error - report getLastErrorString(...) msg
+ return NULL;
+ }
+
+ typedef struct
+ {
+ uint16_t arch_code;
+ char* arch_name;
+ } arch_t;
+
+ static const arch_t arch_array[]={
+ {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
+ {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
+ {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
+ };
+ #if (defined _M_IA64)
+ static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
+ #elif (defined _M_AMD64)
+ static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
+ #elif (defined _M_IX86)
+ static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
+ #else
+ #error Method os::dll_load requires that one of following \
+ is defined :_M_IA64,_M_AMD64 or _M_IX86
+ #endif
+
+
+ // Obtain a string for printf operation
+ // lib_arch_str shall contain string what platform this .dll was built for
+ // running_arch_str shall string contain what platform Hotspot was built for
+ char *running_arch_str=NULL,*lib_arch_str=NULL;
+ for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
+ {
+ if (lib_arch==arch_array[i].arch_code)
+ lib_arch_str=arch_array[i].arch_name;
+ if (running_arch==arch_array[i].arch_code)
+ running_arch_str=arch_array[i].arch_name;
+ }
+
+ assert(running_arch_str,
+ "Didn't find runing architecture code in arch_array");
+
+ // If the architure is right
+ // but some other error took place - report getLastErrorString(...) msg
+ if (lib_arch == running_arch)
+ {
+ return NULL;
+ }
+
+ if (lib_arch_str!=NULL)
+ {
+ ::_snprintf(ebuf, ebuflen-1,
+ "Can't load %s-bit .dll on a %s-bit platform",
+ lib_arch_str,running_arch_str);
+ }
+ else
+ {
+ // don't know what architecture this dll was build for
+ ::_snprintf(ebuf, ebuflen-1,
+ "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
+ lib_arch,running_arch_str);
+ }
+
+ return NULL;
+}
+
+
+void os::print_dll_info(outputStream *st) {
+ int pid = os::current_process_id();
+ st->print_cr("Dynamic libraries:");
+ enumerate_modules(pid, _print_module, (void *)st);
+}
+
+void os::print_os_info(outputStream* st) {
+ st->print("OS:");
+
+ OSVERSIONINFOEX osvi;
+ ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
+ osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
+
+ if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
+ st->print_cr("N/A");
+ return;
+ }
+
+ int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
+
+ if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
+ switch (os_vers) {
+ case 3051: st->print(" Windows NT 3.51"); break;
+ case 4000: st->print(" Windows NT 4.0"); break;
+ case 5000: st->print(" Windows 2000"); break;
+ case 5001: st->print(" Windows XP"); break;
+ case 5002: st->print(" Windows Server 2003 family"); break;
+ case 6000: st->print(" Windows Vista"); break;
+ default: // future windows, print out its major and minor versions
+ st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
+ }
+ } else {
+ switch (os_vers) {
+ case 4000: st->print(" Windows 95"); break;
+ case 4010: st->print(" Windows 98"); break;
+ case 4090: st->print(" Windows Me"); break;
+ default: // future windows, print out its major and minor versions
+ st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
+ }
+ }
+
+ st->print(" Build %d", osvi.dwBuildNumber);
+ st->print(" %s", osvi.szCSDVersion); // service pack
+ st->cr();
+}
+
+void os::print_memory_info(outputStream* st) {
+ st->print("Memory:");
+ st->print(" %dk page", os::vm_page_size()>>10);
+
+ // FIXME: GlobalMemoryStatus() may return incorrect value if total memory
+ // is larger than 4GB
+ MEMORYSTATUS ms;
+ GlobalMemoryStatus(&ms);
+
+ st->print(", physical %uk", os::physical_memory() >> 10);
+ st->print("(%uk free)", os::available_memory() >> 10);
+
+ st->print(", swap %uk", ms.dwTotalPageFile >> 10);
+ st->print("(%uk free)", ms.dwAvailPageFile >> 10);
+ st->cr();
+}
+
+void os::print_siginfo(outputStream *st, void *siginfo) {
+ EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
+ st->print("siginfo:");
+ st->print(" ExceptionCode=0x%x", er->ExceptionCode);
+
+ if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
+ er->NumberParameters >= 2) {
+ switch (er->ExceptionInformation[0]) {
+ case 0: st->print(", reading address"); break;
+ case 1: st->print(", writing address"); break;
+ default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
+ er->ExceptionInformation[0]);
+ }
+ st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
+ } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
+ er->NumberParameters >= 2 && UseSharedSpaces) {
+ FileMapInfo* mapinfo = FileMapInfo::current_info();
+ if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
+ st->print("\n\nError accessing class data sharing archive." \
+ " Mapped file inaccessible during execution, " \
+ " possible disk/network problem.");
+ }
+ } else {
+ int num = er->NumberParameters;
+ if (num > 0) {
+ st->print(", ExceptionInformation=");
+ for (int i = 0; i < num; i++) {
+ st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
+ }
+ }
+ }
+ st->cr();
+}
+
+void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
+ // do nothing
+}
+
+static char saved_jvm_path[MAX_PATH] = {0};
+
+// Find the full path to the current module, jvm.dll or jvm_g.dll
+void os::jvm_path(char *buf, jint buflen) {
+ // Error checking.
+ if (buflen < MAX_PATH) {
+ assert(false, "must use a large-enough buffer");
+ buf[0] = '\0';
+ return;
+ }
+ // Lazy resolve the path to current module.
+ if (saved_jvm_path[0] != 0) {
+ strcpy(buf, saved_jvm_path);
+ return;
+ }
+
+ GetModuleFileName(vm_lib_handle, buf, buflen);
+ strcpy(saved_jvm_path, buf);
+}
+
+
+void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
+#ifndef _WIN64
+ st->print("_");
+#endif
+}
+
+
+void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
+#ifndef _WIN64
+ st->print("@%d", args_size * sizeof(int));
+#endif
+}
+
+// sun.misc.Signal
+// NOTE that this is a workaround for an apparent kernel bug where if
+// a signal handler for SIGBREAK is installed then that signal handler
+// takes priority over the console control handler for CTRL_CLOSE_EVENT.
+// See bug 4416763.
+static void (*sigbreakHandler)(int) = NULL;
+
+static void UserHandler(int sig, void *siginfo, void *context) {
+ os::signal_notify(sig);
+ // We need to reinstate the signal handler each time...
+ os::signal(sig, (void*)UserHandler);
+}
+
+void* os::user_handler() {
+ return (void*) UserHandler;
+}
+
+void* os::signal(int signal_number, void* handler) {
+ if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
+ void (*oldHandler)(int) = sigbreakHandler;
+ sigbreakHandler = (void (*)(int)) handler;
+ return (void*) oldHandler;
+ } else {
+ return (void*)::signal(signal_number, (void (*)(int))handler);
+ }
+}
+
+void os::signal_raise(int signal_number) {
+ raise(signal_number);
+}
+
+// The Win32 C runtime library maps all console control events other than ^C
+// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
+// logoff, and shutdown events. We therefore install our own console handler
+// that raises SIGTERM for the latter cases.
+//
+static BOOL WINAPI consoleHandler(DWORD event) {
+ switch(event) {
+ case CTRL_C_EVENT:
+ if (is_error_reported()) {
+ // Ctrl-C is pressed during error reporting, likely because the error
+ // handler fails to abort. Let VM die immediately.
+ os::die();
+ }
+
+ os::signal_raise(SIGINT);
+ return TRUE;
+ break;
+ case CTRL_BREAK_EVENT:
+ if (sigbreakHandler != NULL) {
+ (*sigbreakHandler)(SIGBREAK);
+ }
+ return TRUE;
+ break;
+ case CTRL_CLOSE_EVENT:
+ case CTRL_LOGOFF_EVENT:
+ case CTRL_SHUTDOWN_EVENT:
+ os::signal_raise(SIGTERM);
+ return TRUE;
+ break;
+ default:
+ break;
+ }
+ return FALSE;
+}
+
+/*
+ * The following code is moved from os.cpp for making this
+ * code platform specific, which it is by its very nature.
+ */
+
+// Return maximum OS signal used + 1 for internal use only
+// Used as exit signal for signal_thread
+int os::sigexitnum_pd(){
+ return NSIG;
+}
+
+// a counter for each possible signal value, including signal_thread exit signal
+static volatile jint pending_signals[NSIG+1] = { 0 };
+static HANDLE sig_sem;
+
+void os::signal_init_pd() {
+ // Initialize signal structures
+ memset((void*)pending_signals, 0, sizeof(pending_signals));
+
+ sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
+
+ // Programs embedding the VM do not want it to attempt to receive
+ // events like CTRL_LOGOFF_EVENT, which are used to implement the
+ // shutdown hooks mechanism introduced in 1.3. For example, when
+ // the VM is run as part of a Windows NT service (i.e., a servlet
+ // engine in a web server), the correct behavior is for any console
+ // control handler to return FALSE, not TRUE, because the OS's
+ // "final" handler for such events allows the process to continue if
+ // it is a service (while terminating it if it is not a service).
+ // To make this behavior uniform and the mechanism simpler, we
+ // completely disable the VM's usage of these console events if -Xrs
+ // (=ReduceSignalUsage) is specified. This means, for example, that
+ // the CTRL-BREAK thread dump mechanism is also disabled in this
+ // case. See bugs 4323062, 4345157, and related bugs.
+
+ if (!ReduceSignalUsage) {
+ // Add a CTRL-C handler
+ SetConsoleCtrlHandler(consoleHandler, TRUE);
+ }
+}
+
+void os::signal_notify(int signal_number) {
+ BOOL ret;
+
+ Atomic::inc(&pending_signals[signal_number]);
+ ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
+ assert(ret != 0, "ReleaseSemaphore() failed");
+}
+
+static int check_pending_signals(bool wait_for_signal) {
+ DWORD ret;
+ while (true) {
+ for (int i = 0; i < NSIG + 1; i++) {
+ jint n = pending_signals[i];
+ if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
+ return i;
+ }
+ }
+ if (!wait_for_signal) {
+ return -1;
+ }
+
+ JavaThread *thread = JavaThread::current();
+
+ ThreadBlockInVM tbivm(thread);
+
+ bool threadIsSuspended;
+ do {
+ thread->set_suspend_equivalent();
+ // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
+ ret = ::WaitForSingleObject(sig_sem, INFINITE);
+ assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
+
+ // were we externally suspended while we were waiting?
+ threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
+ if (threadIsSuspended) {
+ //
+ // The semaphore has been incremented, but while we were waiting
+ // another thread suspended us. We don't want to continue running
+ // while suspended because that would surprise the thread that
+ // suspended us.
+ //
+ ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
+ assert(ret != 0, "ReleaseSemaphore() failed");
+
+ thread->java_suspend_self();
+ }
+ } while (threadIsSuspended);
+ }
+}
+
+int os::signal_lookup() {
+ return check_pending_signals(false);
+}
+
+int os::signal_wait() {
+ return check_pending_signals(true);
+}
+
+// Implicit OS exception handling
+
+LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
+ JavaThread* thread = JavaThread::current();
+ // Save pc in thread
+#ifdef _M_IA64
+ thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
+ // Set pc to handler
+ exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
+#elif _M_AMD64
+ thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
+ // Set pc to handler
+ exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
+#else
+ thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
+ // Set pc to handler
+ exceptionInfo->ContextRecord->Eip = (LONG)handler;
+#endif
+
+ // Continue the execution
+ return EXCEPTION_CONTINUE_EXECUTION;
+}
+
+
+// Used for PostMortemDump
+extern "C" void safepoints();
+extern "C" void find(int x);
+extern "C" void events();
+
+// According to Windows API documentation, an illegal instruction sequence should generate
+// the 0xC000001C exception code. However, real world experience shows that occasionnaly
+// the execution of an illegal instruction can generate the exception code 0xC000001E. This
+// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
+
+#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
+
+// From "Execution Protection in the Windows Operating System" draft 0.35
+// Once a system header becomes available, the "real" define should be
+// included or copied here.
+#define EXCEPTION_INFO_EXEC_VIOLATION 0x08
+
+#define def_excpt(val) #val, val
+
+struct siglabel {
+ char *name;
+ int number;
+};
+
+struct siglabel exceptlabels[] = {
+ def_excpt(EXCEPTION_ACCESS_VIOLATION),
+ def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
+ def_excpt(EXCEPTION_BREAKPOINT),
+ def_excpt(EXCEPTION_SINGLE_STEP),
+ def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
+ def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
+ def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
+ def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
+ def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
+ def_excpt(EXCEPTION_FLT_OVERFLOW),
+ def_excpt(EXCEPTION_FLT_STACK_CHECK),
+ def_excpt(EXCEPTION_FLT_UNDERFLOW),
+ def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
+ def_excpt(EXCEPTION_INT_OVERFLOW),
+ def_excpt(EXCEPTION_PRIV_INSTRUCTION),
+ def_excpt(EXCEPTION_IN_PAGE_ERROR),
+ def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
+ def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
+ def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
+ def_excpt(EXCEPTION_STACK_OVERFLOW),
+ def_excpt(EXCEPTION_INVALID_DISPOSITION),
+ def_excpt(EXCEPTION_GUARD_PAGE),
+ def_excpt(EXCEPTION_INVALID_HANDLE),
+ NULL, 0
+};
+
+const char* os::exception_name(int exception_code, char *buf, size_t size) {
+ for (int i = 0; exceptlabels[i].name != NULL; i++) {
+ if (exceptlabels[i].number == exception_code) {
+ jio_snprintf(buf, size, "%s", exceptlabels[i].name);
+ return buf;
+ }
+ }
+
+ return NULL;
+}
+
+//-----------------------------------------------------------------------------
+LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
+ // handle exception caused by idiv; should only happen for -MinInt/-1
+ // (division by zero is handled explicitly)
+#ifdef _M_IA64
+ assert(0, "Fix Handle_IDiv_Exception");
+#elif _M_AMD64
+ PCONTEXT ctx = exceptionInfo->ContextRecord;
+ address pc = (address)ctx->Rip;
+ NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
+ assert(pc[0] == 0xF7, "not an idiv opcode");
+ assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
+ assert(ctx->Rax == min_jint, "unexpected idiv exception");
+ // set correct result values and continue after idiv instruction
+ ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
+ ctx->Rax = (DWORD)min_jint; // result
+ ctx->Rdx = (DWORD)0; // remainder
+ // Continue the execution
+#else
+ PCONTEXT ctx = exceptionInfo->ContextRecord;
+ address pc = (address)ctx->Eip;
+ NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
+ assert(pc[0] == 0xF7, "not an idiv opcode");
+ assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
+ assert(ctx->Eax == min_jint, "unexpected idiv exception");
+ // set correct result values and continue after idiv instruction
+ ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
+ ctx->Eax = (DWORD)min_jint; // result
+ ctx->Edx = (DWORD)0; // remainder
+ // Continue the execution
+#endif
+ return EXCEPTION_CONTINUE_EXECUTION;
+}
+
+#ifndef _WIN64
+//-----------------------------------------------------------------------------
+LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
+ // handle exception caused by native mothod modifying control word
+ PCONTEXT ctx = exceptionInfo->ContextRecord;
+ DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
+
+ switch (exception_code) {
+ case EXCEPTION_FLT_DENORMAL_OPERAND:
+ case EXCEPTION_FLT_DIVIDE_BY_ZERO:
+ case EXCEPTION_FLT_INEXACT_RESULT:
+ case EXCEPTION_FLT_INVALID_OPERATION:
+ case EXCEPTION_FLT_OVERFLOW:
+ case EXCEPTION_FLT_STACK_CHECK:
+ case EXCEPTION_FLT_UNDERFLOW:
+ jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
+ if (fp_control_word != ctx->FloatSave.ControlWord) {
+ // Restore FPCW and mask out FLT exceptions
+ ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
+ // Mask out pending FLT exceptions
+ ctx->FloatSave.StatusWord &= 0xffffff00;
+ return EXCEPTION_CONTINUE_EXECUTION;
+ }
+ }
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+#else //_WIN64
+/*
+ On Windows, the mxcsr control bits are non-volatile across calls
+ See also CR 6192333
+ If EXCEPTION_FLT_* happened after some native method modified
+ mxcsr - it is not a jvm fault.
+ However should we decide to restore of mxcsr after a faulty
+ native method we can uncomment following code
+ jint MxCsr = INITIAL_MXCSR;
+ // we can't use StubRoutines::addr_mxcsr_std()
+ // because in Win64 mxcsr is not saved there
+ if (MxCsr != ctx->MxCsr) {
+ ctx->MxCsr = MxCsr;
+ return EXCEPTION_CONTINUE_EXECUTION;
+ }
+
+*/
+#endif //_WIN64
+
+
+// Fatal error reporting is single threaded so we can make this a
+// static and preallocated. If it's more than MAX_PATH silently ignore
+// it.
+static char saved_error_file[MAX_PATH] = {0};
+
+void os::set_error_file(const char *logfile) {
+ if (strlen(logfile) <= MAX_PATH) {
+ strncpy(saved_error_file, logfile, MAX_PATH);
+ }
+}
+
+static inline void report_error(Thread* t, DWORD exception_code,
+ address addr, void* siginfo, void* context) {
+ VMError err(t, exception_code, addr, siginfo, context);
+ err.report_and_die();
+
+ // If UseOsErrorReporting, this will return here and save the error file
+ // somewhere where we can find it in the minidump.
+}
+
+//-----------------------------------------------------------------------------
+LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
+ if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
+ DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
+#ifdef _M_IA64
+ address pc = (address) exceptionInfo->ContextRecord->StIIP;
+#elif _M_AMD64
+ address pc = (address) exceptionInfo->ContextRecord->Rip;
+#else
+ address pc = (address) exceptionInfo->ContextRecord->Eip;
+#endif
+ Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
+
+#ifndef _WIN64
+ // Execution protection violation - win32 running on AMD64 only
+ // Handled first to avoid misdiagnosis as a "normal" access violation;
+ // This is safe to do because we have a new/unique ExceptionInformation
+ // code for this condition.
+ if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
+ PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+ int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
+ address addr = (address) exceptionRecord->ExceptionInformation[1];
+
+ if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
+ int page_size = os::vm_page_size();
+
+ // Make sure the pc and the faulting address are sane.
+ //
+ // If an instruction spans a page boundary, and the page containing
+ // the beginning of the instruction is executable but the following
+ // page is not, the pc and the faulting address might be slightly
+ // different - we still want to unguard the 2nd page in this case.
+ //
+ // 15 bytes seems to be a (very) safe value for max instruction size.
+ bool pc_is_near_addr =
+ (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
+ bool instr_spans_page_boundary =
+ (align_size_down((intptr_t) pc ^ (intptr_t) addr,
+ (intptr_t) page_size) > 0);
+
+ if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
+ static volatile address last_addr =
+ (address) os::non_memory_address_word();
+
+ // In conservative mode, don't unguard unless the address is in the VM
+ if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
+ (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
+
+ // Unguard and retry
+ address page_start =
+ (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
+ bool res = os::unguard_memory((char*) page_start, page_size);
+
+ if (PrintMiscellaneous && Verbose) {
+ char buf[256];
+ jio_snprintf(buf, sizeof(buf), "Execution protection violation "
+ "at " INTPTR_FORMAT
+ ", unguarding " INTPTR_FORMAT ": %s", addr,
+ page_start, (res ? "success" : strerror(errno)));
+ tty->print_raw_cr(buf);
+ }
+
+ // Set last_addr so if we fault again at the same address, we don't
+ // end up in an endless loop.
+ //
+ // There are two potential complications here. Two threads trapping
+ // at the same address at the same time could cause one of the
+ // threads to think it already unguarded, and abort the VM. Likely
+ // very rare.
+ //
+ // The other race involves two threads alternately trapping at
+ // different addresses and failing to unguard the page, resulting in
+ // an endless loop. This condition is probably even more unlikely
+ // than the first.
+ //
+ // Although both cases could be avoided by using locks or thread
+ // local last_addr, these solutions are unnecessary complication:
+ // this handler is a best-effort safety net, not a complete solution.
+ // It is disabled by default and should only be used as a workaround
+ // in case we missed any no-execute-unsafe VM code.
+
+ last_addr = addr;
+
+ return EXCEPTION_CONTINUE_EXECUTION;
+ }
+ }
+
+ // Last unguard failed or not unguarding
+ tty->print_raw_cr("Execution protection violation");
+ report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
+ exceptionInfo->ContextRecord);
+ return EXCEPTION_CONTINUE_SEARCH;
+ }
+ }
+#endif // _WIN64
+
+ // Check to see if we caught the safepoint code in the
+ // process of write protecting the memory serialization page.
+ // It write enables the page immediately after protecting it
+ // so just return.
+ if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
+ JavaThread* thread = (JavaThread*) t;
+ PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+ address addr = (address) exceptionRecord->ExceptionInformation[1];
+ if ( os::is_memory_serialize_page(thread, addr) ) {
+ // Block current thread until the memory serialize page permission restored.
+ os::block_on_serialize_page_trap();
+ return EXCEPTION_CONTINUE_EXECUTION;
+ }
+ }
+
+
+ if (t != NULL && t->is_Java_thread()) {
+ JavaThread* thread = (JavaThread*) t;
+ bool in_java = thread->thread_state() == _thread_in_Java;
+
+ // Handle potential stack overflows up front.
+ if (exception_code == EXCEPTION_STACK_OVERFLOW) {
+ if (os::uses_stack_guard_pages()) {
+#ifdef _M_IA64
+ //
+ // If it's a legal stack address continue, Windows will map it in.
+ //
+ PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+ address addr = (address) exceptionRecord->ExceptionInformation[1];
+ if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
+ return EXCEPTION_CONTINUE_EXECUTION;
+
+ // The register save area is the same size as the memory stack
+ // and starts at the page just above the start of the memory stack.
+ // If we get a fault in this area, we've run out of register
+ // stack. If we are in java, try throwing a stack overflow exception.
+ if (addr > thread->stack_base() &&
+ addr <= (thread->stack_base()+thread->stack_size()) ) {
+ char buf[256];
+ jio_snprintf(buf, sizeof(buf),
+ "Register stack overflow, addr:%p, stack_base:%p\n",
+ addr, thread->stack_base() );
+ tty->print_raw_cr(buf);
+ // If not in java code, return and hope for the best.
+ return in_java ? Handle_Exception(exceptionInfo,
+ SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
+ : EXCEPTION_CONTINUE_EXECUTION;
+ }
+#endif
+ if (thread->stack_yellow_zone_enabled()) {
+ // Yellow zone violation. The o/s has unprotected the first yellow
+ // zone page for us. Note: must call disable_stack_yellow_zone to
+ // update the enabled status, even if the zone contains only one page.
+ thread->disable_stack_yellow_zone();
+ // If not in java code, return and hope for the best.
+ return in_java ? Handle_Exception(exceptionInfo,
+ SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
+ : EXCEPTION_CONTINUE_EXECUTION;
+ } else {
+ // Fatal red zone violation.
+ thread->disable_stack_red_zone();
+ tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
+ report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+ exceptionInfo->ContextRecord);
+ return EXCEPTION_CONTINUE_SEARCH;
+ }
+ } else if (in_java) {
+ // JVM-managed guard pages cannot be used on win95/98. The o/s provides
+ // a one-time-only guard page, which it has released to us. The next
+ // stack overflow on this thread will result in an ACCESS_VIOLATION.
+ return Handle_Exception(exceptionInfo,
+ SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
+ } else {
+ // Can only return and hope for the best. Further stack growth will
+ // result in an ACCESS_VIOLATION.
+ return EXCEPTION_CONTINUE_EXECUTION;
+ }
+ } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
+ // Either stack overflow or null pointer exception.
+ if (in_java) {
+ PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+ address addr = (address) exceptionRecord->ExceptionInformation[1];
+ address stack_end = thread->stack_base() - thread->stack_size();
+ if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
+ // Stack overflow.
+ assert(!os::uses_stack_guard_pages(),
+ "should be caught by red zone code above.");
+ return Handle_Exception(exceptionInfo,
+ SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
+ }
+ //
+ // Check for safepoint polling and implicit null
+ // We only expect null pointers in the stubs (vtable)
+ // the rest are checked explicitly now.
+ //
+ CodeBlob* cb = CodeCache::find_blob(pc);
+ if (cb != NULL) {
+ if (os::is_poll_address(addr)) {
+ address stub = SharedRuntime::get_poll_stub(pc);
+ return Handle_Exception(exceptionInfo, stub);
+ }
+ }
+ {
+#ifdef _WIN64
+ //
+ // If it's a legal stack address map the entire region in
+ //
+ PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+ address addr = (address) exceptionRecord->ExceptionInformation[1];
+ if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
+ addr = (address)((uintptr_t)addr &
+ (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
+ os::commit_memory( (char *)addr, thread->stack_base() - addr );
+ return EXCEPTION_CONTINUE_EXECUTION;
+ }
+ else
+#endif
+ {
+ // Null pointer exception.
+#ifdef _M_IA64
+ // We catch register stack overflows in compiled code by doing
+ // an explicit compare and executing a st8(G0, G0) if the
+ // BSP enters into our guard area. We test for the overflow
+ // condition and fall into the normal null pointer exception
+ // code if BSP hasn't overflowed.
+ if ( in_java ) {
+ if(thread->register_stack_overflow()) {
+ assert((address)exceptionInfo->ContextRecord->IntS3 ==
+ thread->register_stack_limit(),
+ "GR7 doesn't contain register_stack_limit");
+ // Disable the yellow zone which sets the state that
+ // we've got a stack overflow problem.
+ if (thread->stack_yellow_zone_enabled()) {
+ thread->disable_stack_yellow_zone();
+ }
+ // Give us some room to process the exception
+ thread->disable_register_stack_guard();
+ // Update GR7 with the new limit so we can continue running
+ // compiled code.
+ exceptionInfo->ContextRecord->IntS3 =
+ (ULONGLONG)thread->register_stack_limit();
+ return Handle_Exception(exceptionInfo,
+ SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
+ } else {
+ //
+ // Check for implicit null
+ // We only expect null pointers in the stubs (vtable)
+ // the rest are checked explicitly now.
+ //
+ CodeBlob* cb = CodeCache::find_blob(pc);
+ if (cb != NULL) {
+ if (VtableStubs::stub_containing(pc) != NULL) {
+ if (((uintptr_t)addr) < os::vm_page_size() ) {
+ // an access to the first page of VM--assume it is a null pointer
+ return Handle_Exception(exceptionInfo,
+ SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL));
+ }
+ }
+ }
+ }
+ } // in_java
+
+ // IA64 doesn't use implicit null checking yet. So we shouldn't
+ // get here.
+ tty->print_raw_cr("Access violation, possible null pointer exception");
+ report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+ exceptionInfo->ContextRecord);
+ return EXCEPTION_CONTINUE_SEARCH;
+#else /* !IA64 */
+
+ // Windows 98 reports faulting addresses incorrectly
+ if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
+ !os::win32::is_nt()) {
+ return Handle_Exception(exceptionInfo,
+ SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL));
+ }
+ report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+ exceptionInfo->ContextRecord);
+ return EXCEPTION_CONTINUE_SEARCH;
+#endif
+ }
+ }
+ }
+
+#ifdef _WIN64
+ // Special care for fast JNI field accessors.
+ // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
+ // in and the heap gets shrunk before the field access.
+ if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
+ address addr = JNI_FastGetField::find_slowcase_pc(pc);
+ if (addr != (address)-1) {
+ return Handle_Exception(exceptionInfo, addr);
+ }
+ }
+#endif
+
+#ifdef _WIN64
+ // Windows will sometimes generate an access violation
+ // when we call malloc. Since we use VectoredExceptions
+ // on 64 bit platforms, we see this exception. We must
+ // pass this exception on so Windows can recover.
+ // We check to see if the pc of the fault is in NTDLL.DLL
+ // if so, we pass control on to Windows for handling.
+ if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
+#endif
+
+ // Stack overflow or null pointer exception in native code.
+ report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+ exceptionInfo->ContextRecord);
+ return EXCEPTION_CONTINUE_SEARCH;
+ }
+
+ if (in_java) {
+ switch (exception_code) {
+ case EXCEPTION_INT_DIVIDE_BY_ZERO:
+ return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
+
+ case EXCEPTION_INT_OVERFLOW:
+ return Handle_IDiv_Exception(exceptionInfo);
+
+ } // switch
+ }
+#ifndef _WIN64
+ if ((thread->thread_state() == _thread_in_Java) ||
+ (thread->thread_state() == _thread_in_native) )
+ {
+ LONG result=Handle_FLT_Exception(exceptionInfo);
+ if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
+ }
+#endif //_WIN64
+ }
+
+ if (exception_code != EXCEPTION_BREAKPOINT) {
+#ifndef _WIN64
+ report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+ exceptionInfo->ContextRecord);
+#else
+ // Itanium Windows uses a VectoredExceptionHandler
+ // Which means that C++ programatic exception handlers (try/except)
+ // will get here. Continue the search for the right except block if
+ // the exception code is not a fatal code.
+ switch ( exception_code ) {
+ case EXCEPTION_ACCESS_VIOLATION:
+ case EXCEPTION_STACK_OVERFLOW:
+ case EXCEPTION_ILLEGAL_INSTRUCTION:
+ case EXCEPTION_ILLEGAL_INSTRUCTION_2:
+ case EXCEPTION_INT_OVERFLOW:
+ case EXCEPTION_INT_DIVIDE_BY_ZERO:
+ { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+ exceptionInfo->ContextRecord);
+ }
+ break;
+ default:
+ break;
+ }
+#endif
+ }
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+
+#ifndef _WIN64
+// Special care for fast JNI accessors.
+// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
+// the heap gets shrunk before the field access.
+// Need to install our own structured exception handler since native code may
+// install its own.
+LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
+ DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
+ if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
+ address pc = (address) exceptionInfo->ContextRecord->Eip;
+ address addr = JNI_FastGetField::find_slowcase_pc(pc);
+ if (addr != (address)-1) {
+ return Handle_Exception(exceptionInfo, addr);
+ }
+ }
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+
+#define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
+Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
+ __try { \
+ return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
+ } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
+ } \
+ return 0; \
+}
+
+DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
+DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
+DEFINE_FAST_GETFIELD(jchar, char, Char)
+DEFINE_FAST_GETFIELD(jshort, short, Short)
+DEFINE_FAST_GETFIELD(jint, int, Int)
+DEFINE_FAST_GETFIELD(jlong, long, Long)
+DEFINE_FAST_GETFIELD(jfloat, float, Float)
+DEFINE_FAST_GETFIELD(jdouble, double, Double)
+
+address os::win32::fast_jni_accessor_wrapper(BasicType type) {
+ switch (type) {
+ case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
+ case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
+ case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
+ case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
+ case T_INT: return (address)jni_fast_GetIntField_wrapper;
+ case T_LONG: return (address)jni_fast_GetLongField_wrapper;
+ case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
+ case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
+ default: ShouldNotReachHere();
+ }
+ return (address)-1;
+}
+#endif
+
+// Virtual Memory
+
+int os::vm_page_size() { return os::win32::vm_page_size(); }
+int os::vm_allocation_granularity() {
+ return os::win32::vm_allocation_granularity();
+}
+
+// Windows large page support is available on Windows 2003. In order to use
+// large page memory, the administrator must first assign additional privilege
+// to the user:
+// + select Control Panel -> Administrative Tools -> Local Security Policy
+// + select Local Policies -> User Rights Assignment
+// + double click "Lock pages in memory", add users and/or groups
+// + reboot
+// Note the above steps are needed for administrator as well, as administrators
+// by default do not have the privilege to lock pages in memory.
+//
+// Note about Windows 2003: although the API supports committing large page
+// memory on a page-by-page basis and VirtualAlloc() returns success under this
+// scenario, I found through experiment it only uses large page if the entire
+// memory region is reserved and committed in a single VirtualAlloc() call.
+// This makes Windows large page support more or less like Solaris ISM, in
+// that the entire heap must be committed upfront. This probably will change
+// in the future, if so the code below needs to be revisited.
+
+#ifndef MEM_LARGE_PAGES
+#define MEM_LARGE_PAGES 0x20000000
+#endif
+
+// GetLargePageMinimum is only available on Windows 2003. The other functions
+// are available on NT but not on Windows 98/Me. We have to resolve them at
+// runtime.
+typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
+typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
+ (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
+typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
+typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
+
+static GetLargePageMinimum_func_type _GetLargePageMinimum;
+static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
+static OpenProcessToken_func_type _OpenProcessToken;
+static LookupPrivilegeValue_func_type _LookupPrivilegeValue;
+
+static HINSTANCE _kernel32;
+static HINSTANCE _advapi32;
+static HANDLE _hProcess;
+static HANDLE _hToken;
+
+static size_t _large_page_size = 0;
+
+static bool resolve_functions_for_large_page_init() {
+ _kernel32 = LoadLibrary("kernel32.dll");
+ if (_kernel32 == NULL) return false;
+
+ _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
+ GetProcAddress(_kernel32, "GetLargePageMinimum"));
+ if (_GetLargePageMinimum == NULL) return false;
+
+ _advapi32 = LoadLibrary("advapi32.dll");
+ if (_advapi32 == NULL) return false;
+
+ _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
+ GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
+ _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type,
+ GetProcAddress(_advapi32, "OpenProcessToken"));
+ _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
+ GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
+ return _AdjustTokenPrivileges != NULL &&
+ _OpenProcessToken != NULL &&
+ _LookupPrivilegeValue != NULL;
+}
+
+static bool request_lock_memory_privilege() {
+ _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
+ os::current_process_id());
+
+ LUID luid;
+ if (_hProcess != NULL &&
+ _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
+ _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
+
+ TOKEN_PRIVILEGES tp;
+ tp.PrivilegeCount = 1;
+ tp.Privileges[0].Luid = luid;
+ tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
+
+ // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
+ // privilege. Check GetLastError() too. See MSDN document.
+ if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
+ (GetLastError() == ERROR_SUCCESS)) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static void cleanup_after_large_page_init() {
+ _GetLargePageMinimum = NULL;
+ _AdjustTokenPrivileges = NULL;
+ _OpenProcessToken = NULL;
+ _LookupPrivilegeValue = NULL;
+ if (_kernel32) FreeLibrary(_kernel32);
+ _kernel32 = NULL;
+ if (_advapi32) FreeLibrary(_advapi32);
+ _advapi32 = NULL;
+ if (_hProcess) CloseHandle(_hProcess);
+ _hProcess = NULL;
+ if (_hToken) CloseHandle(_hToken);
+ _hToken = NULL;
+}
+
+bool os::large_page_init() {
+ if (!UseLargePages) return false;
+
+ // print a warning if any large page related flag is specified on command line
+ bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
+ !FLAG_IS_DEFAULT(LargePageSizeInBytes);
+ bool success = false;
+
+# define WARN(msg) if (warn_on_failure) { warning(msg); }
+ if (resolve_functions_for_large_page_init()) {
+ if (request_lock_memory_privilege()) {
+ size_t s = _GetLargePageMinimum();
+ if (s) {
+#if defined(IA32) || defined(AMD64)
+ if (s > 4*M || LargePageSizeInBytes > 4*M) {
+ WARN("JVM cannot use large pages bigger than 4mb.");
+ } else {
+#endif
+ if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
+ _large_page_size = LargePageSizeInBytes;
+ } else {
+ _large_page_size = s;
+ }
+ success = true;
+#if defined(IA32) || defined(AMD64)
+ }
+#endif
+ } else {
+ WARN("Large page is not supported by the processor.");
+ }
+ } else {
+ WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
+ }
+ } else {
+ WARN("Large page is not supported by the operating system.");
+ }
+#undef WARN
+
+ const size_t default_page_size = (size_t) vm_page_size();
+ if (success && _large_page_size > default_page_size) {
+ _page_sizes[0] = _large_page_size;
+ _page_sizes[1] = default_page_size;
+ _page_sizes[2] = 0;
+ }
+
+ cleanup_after_large_page_init();
+ return success;
+}
+
+// On win32, one cannot release just a part of reserved memory, it's an
+// all or nothing deal. When we split a reservation, we must break the
+// reservation into two reservations.
+void os::split_reserved_memory(char *base, size_t size, size_t split,
+ bool realloc) {
+ if (size > 0) {
+ release_memory(base, size);
+ if (realloc) {
+ reserve_memory(split, base);
+ }
+ if (size != split) {
+ reserve_memory(size - split, base + split);
+ }
+ }
+}
+
+char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
+ assert((size_t)addr % os::vm_allocation_granularity() == 0,
+ "reserve alignment");
+ assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
+ char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE,
+ PAGE_EXECUTE_READWRITE);
+ assert(res == NULL || addr == NULL || addr == res,
+ "Unexpected address from reserve.");
+ return res;
+}
+
+// Reserve memory at an arbitrary address, only if that area is
+// available (and not reserved for something else).
+char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
+ // Windows os::reserve_memory() fails of the requested address range is
+ // not avilable.
+ return reserve_memory(bytes, requested_addr);
+}
+
+size_t os::large_page_size() {
+ return _large_page_size;
+}
+
+bool os::can_commit_large_page_memory() {
+ // Windows only uses large page memory when the entire region is reserved
+ // and committed in a single VirtualAlloc() call. This may change in the
+ // future, but with Windows 2003 it's not possible to commit on demand.
+ return false;
+}
+
+char* os::reserve_memory_special(size_t bytes) {
+ DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
+ char * res = (char *)VirtualAlloc(NULL, bytes, flag, PAGE_READWRITE);
+ return res;
+}
+
+bool os::release_memory_special(char* base, size_t bytes) {
+ return release_memory(base, bytes);
+}
+
+void os::print_statistics() {
+}
+
+bool os::commit_memory(char* addr, size_t bytes) {
+ if (bytes == 0) {
+ // Don't bother the OS with noops.
+ return true;
+ }
+ assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
+ assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
+ // Don't attempt to print anything if the OS call fails. We're
+ // probably low on resources, so the print itself may cause crashes.
+ return VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE) != NULL;
+}
+
+bool os::commit_memory(char* addr, size_t size, size_t alignment_hint) {
+ return commit_memory(addr, size);
+}
+
+bool os::uncommit_memory(char* addr, size_t bytes) {
+ if (bytes == 0) {
+ // Don't bother the OS with noops.
+ return true;
+ }
+ assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
+ assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
+ return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
+}
+
+bool os::release_memory(char* addr, size_t bytes) {
+ return VirtualFree(addr, 0, MEM_RELEASE) != 0;
+}
+
+bool os::protect_memory(char* addr, size_t bytes) {
+ DWORD old_status;
+ return VirtualProtect(addr, bytes, PAGE_READONLY, &old_status) != 0;
+}
+
+bool os::guard_memory(char* addr, size_t bytes) {
+ DWORD old_status;
+ return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_status) != 0;
+}
+
+bool os::unguard_memory(char* addr, size_t bytes) {
+ DWORD old_status;
+ return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &old_status) != 0;
+}
+
+void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
+void os::free_memory(char *addr, size_t bytes) { }
+void os::numa_make_global(char *addr, size_t bytes) { }
+void os::numa_make_local(char *addr, size_t bytes) { }
+bool os::numa_topology_changed() { return false; }
+size_t os::numa_get_groups_num() { return 1; }
+int os::numa_get_group_id() { return 0; }
+size_t os::numa_get_leaf_groups(int *ids, size_t size) {
+ if (size > 0) {
+ ids[0] = 0;
+ return 1;
+ }
+ return 0;
+}
+
+bool os::get_page_info(char *start, page_info* info) {
+ return false;
+}
+
+char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
+ return end;
+}
+
+char* os::non_memory_address_word() {
+ // Must never look like an address returned by reserve_memory,
+ // even in its subfields (as defined by the CPU immediate fields,
+ // if the CPU splits constants across multiple instructions).
+ return (char*)-1;
+}
+
+#define MAX_ERROR_COUNT 100
+#define SYS_THREAD_ERROR 0xffffffffUL
+
+void os::pd_start_thread(Thread* thread) {
+ DWORD ret = ResumeThread(thread->osthread()->thread_handle());
+ // Returns previous suspend state:
+ // 0: Thread was not suspended
+ // 1: Thread is running now
+ // >1: Thread is still suspended.
+ assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
+}
+
+size_t os::read(int fd, void *buf, unsigned int nBytes) {
+ return ::read(fd, buf, nBytes);
+}
+
+class HighResolutionInterval {
+ // The default timer resolution seems to be 10 milliseconds.
+ // (Where is this written down?)
+ // If someone wants to sleep for only a fraction of the default,
+ // then we set the timer resolution down to 1 millisecond for
+ // the duration of their interval.
+ // We carefully set the resolution back, since otherwise we
+ // seem to incur an overhead (3%?) that we don't need.
+ // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
+ // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
+ // Alternatively, we could compute the relative error (503/500 = .6%) and only use
+ // timeBeginPeriod() if the relative error exceeded some threshold.
+ // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
+ // to decreased efficiency related to increased timer "tick" rates. We want to minimize
+ // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
+ // resolution timers running.
+private:
+ jlong resolution;
+public:
+ HighResolutionInterval(jlong ms) {
+ resolution = ms % 10L;
+ if (resolution != 0) {
+ MMRESULT result = timeBeginPeriod(1L);
+ }
+ }
+ ~HighResolutionInterval() {
+ if (resolution != 0) {
+ MMRESULT result = timeEndPeriod(1L);
+ }
+ resolution = 0L;
+ }
+};
+
+int os::sleep(Thread* thread, jlong ms, bool interruptable) {
+ jlong limit = (jlong) MAXDWORD;
+
+ while(ms > limit) {
+ int res;
+ if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
+ return res;
+ ms -= limit;
+ }
+
+ assert(thread == Thread::current(), "thread consistency check");
+ OSThread* osthread = thread->osthread();
+ OSThreadWaitState osts(osthread, false /* not Object.wait() */);
+ int result;
+ if (interruptable) {
+ assert(thread->is_Java_thread(), "must be java thread");
+ JavaThread *jt = (JavaThread *) thread;
+ ThreadBlockInVM tbivm(jt);
+
+ jt->set_suspend_equivalent();
+ // cleared by handle_special_suspend_equivalent_condition() or
+ // java_suspend_self() via check_and_wait_while_suspended()
+
+ HANDLE events[1];
+ events[0] = osthread->interrupt_event();
+ HighResolutionInterval *phri=NULL;
+ if(!ForceTimeHighResolution)
+ phri = new HighResolutionInterval( ms );
+ if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
+ result = OS_TIMEOUT;
+ } else {
+ ResetEvent(osthread->interrupt_event());
+ osthread->set_interrupted(false);
+ result = OS_INTRPT;
+ }
+ delete phri; //if it is NULL, harmless
+
+ // were we externally suspended while we were waiting?
+ jt->check_and_wait_while_suspended();
+ } else {
+ assert(!thread->is_Java_thread(), "must not be java thread");
+ Sleep((long) ms);
+ result = OS_TIMEOUT;
+ }
+ return result;
+}
+
+// Sleep forever; naked call to OS-specific sleep; use with CAUTION
+void os::infinite_sleep() {
+ while (true) { // sleep forever ...
+ Sleep(100000); // ... 100 seconds at a time
+ }
+}
+
+typedef BOOL (WINAPI * STTSignature)(void) ;
+
+os::YieldResult os::NakedYield() {
+ // Use either SwitchToThread() or Sleep(0)
+ // Consider passing back the return value from SwitchToThread().
+ // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
+ // In that case we revert to Sleep(0).
+ static volatile STTSignature stt = (STTSignature) 1 ;
+
+ if (stt == ((STTSignature) 1)) {
+ stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
+ // It's OK if threads race during initialization as the operation above is idempotent.
+ }
+ if (stt != NULL) {
+ return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
+ } else {
+ Sleep (0) ;
+ }
+ return os::YIELD_UNKNOWN ;
+}
+
+void os::yield() { os::NakedYield(); }
+
+void os::yield_all(int attempts) {
+ // Yields to all threads, including threads with lower priorities
+ Sleep(1);
+}
+
+// Win32 only gives you access to seven real priorities at a time,
+// so we compress Java's ten down to seven. It would be better
+// if we dynamically adjusted relative priorities.
+
+int os::java_to_os_priority[MaxPriority + 1] = {
+ THREAD_PRIORITY_IDLE, // 0 Entry should never be used
+ THREAD_PRIORITY_LOWEST, // 1 MinPriority
+ THREAD_PRIORITY_LOWEST, // 2
+ THREAD_PRIORITY_BELOW_NORMAL, // 3
+ THREAD_PRIORITY_BELOW_NORMAL, // 4
+ THREAD_PRIORITY_NORMAL, // 5 NormPriority
+ THREAD_PRIORITY_NORMAL, // 6
+ THREAD_PRIORITY_ABOVE_NORMAL, // 7
+ THREAD_PRIORITY_ABOVE_NORMAL, // 8
+ THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
+ THREAD_PRIORITY_HIGHEST // 10 MaxPriority
+};
+
+int prio_policy1[MaxPriority + 1] = {
+ THREAD_PRIORITY_IDLE, // 0 Entry should never be used
+ THREAD_PRIORITY_LOWEST, // 1 MinPriority
+ THREAD_PRIORITY_LOWEST, // 2
+ THREAD_PRIORITY_BELOW_NORMAL, // 3
+ THREAD_PRIORITY_BELOW_NORMAL, // 4
+ THREAD_PRIORITY_NORMAL, // 5 NormPriority
+ THREAD_PRIORITY_ABOVE_NORMAL, // 6
+ THREAD_PRIORITY_ABOVE_NORMAL, // 7
+ THREAD_PRIORITY_HIGHEST, // 8
+ THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
+ THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
+};
+
+static int prio_init() {
+ // If ThreadPriorityPolicy is 1, switch tables
+ if (ThreadPriorityPolicy == 1) {
+ int i;
+ for (i = 0; i < MaxPriority + 1; i++) {
+ os::java_to_os_priority[i] = prio_policy1[i];
+ }
+ }
+ return 0;
+}
+
+OSReturn os::set_native_priority(Thread* thread, int priority) {
+ if (!UseThreadPriorities) return OS_OK;
+ bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
+ return ret ? OS_OK : OS_ERR;
+}
+
+OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
+ if ( !UseThreadPriorities ) {
+ *priority_ptr = java_to_os_priority[NormPriority];
+ return OS_OK;
+ }
+ int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
+ if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
+ assert(false, "GetThreadPriority failed");
+ return OS_ERR;
+ }
+ *priority_ptr = os_prio;
+ return OS_OK;
+}
+
+
+// Hint to the underlying OS that a task switch would not be good.
+// Void return because it's a hint and can fail.
+void os::hint_no_preempt() {}
+
+void os::interrupt(Thread* thread) {
+ assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
+ "possibility of dangling Thread pointer");
+
+ OSThread* osthread = thread->osthread();
+ osthread->set_interrupted(true);
+ // More than one thread can get here with the same value of osthread,
+ // resulting in multiple notifications. We do, however, want the store
+ // to interrupted() to be visible to other threads before we post
+ // the interrupt event.
+ OrderAccess::release();
+ SetEvent(osthread->interrupt_event());
+ // For JSR166: unpark after setting status
+ if (thread->is_Java_thread())
+ ((JavaThread*)thread)->parker()->unpark();
+
+ ParkEvent * ev = thread->_ParkEvent ;
+ if (ev != NULL) ev->unpark() ;
+
+}
+
+
+bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
+ assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
+ "possibility of dangling Thread pointer");
+
+ OSThread* osthread = thread->osthread();
+ bool interrupted;
+ interrupted = osthread->interrupted();
+ if (clear_interrupted == true) {
+ osthread->set_interrupted(false);
+ ResetEvent(osthread->interrupt_event());
+ } // Otherwise leave the interrupted state alone
+
+ return interrupted;
+}
+
+// Get's a pc (hint) for a running thread. Currently used only for profiling.
+ExtendedPC os::get_thread_pc(Thread* thread) {
+ CONTEXT context;
+ context.ContextFlags = CONTEXT_CONTROL;
+ HANDLE handle = thread->osthread()->thread_handle();
+#ifdef _M_IA64
+ assert(0, "Fix get_thread_pc");
+ return ExtendedPC(NULL);
+#else
+ if (GetThreadContext(handle, &context)) {
+#ifdef _M_AMD64
+ return ExtendedPC((address) context.Rip);
+#else
+ return ExtendedPC((address) context.Eip);
+#endif
+ } else {
+ return ExtendedPC(NULL);
+ }
+#endif
+}
+
+// GetCurrentThreadId() returns DWORD
+intx os::current_thread_id() { return GetCurrentThreadId(); }
+
+static int _initial_pid = 0;
+
+int os::current_process_id()
+{
+ return (_initial_pid ? _initial_pid : _getpid());
+}
+
+int os::win32::_vm_page_size = 0;
+int os::win32::_vm_allocation_granularity = 0;
+int os::win32::_processor_type = 0;
+// Processor level is not available on non-NT systems, use vm_version instead
+int os::win32::_processor_level = 0;
+julong os::win32::_physical_memory = 0;
+size_t os::win32::_default_stack_size = 0;
+
+ intx os::win32::_os_thread_limit = 0;
+volatile intx os::win32::_os_thread_count = 0;
+
+bool os::win32::_is_nt = false;
+
+
+void os::win32::initialize_system_info() {
+ SYSTEM_INFO si;
+ GetSystemInfo(&si);
+ _vm_page_size = si.dwPageSize;
+ _vm_allocation_granularity = si.dwAllocationGranularity;
+ _processor_type = si.dwProcessorType;
+ _processor_level = si.wProcessorLevel;
+ _processor_count = si.dwNumberOfProcessors;
+
+ MEMORYSTATUS ms;
+ // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
+ // dwMemoryLoad (% of memory in use)
+ GlobalMemoryStatus(&ms);
+ _physical_memory = ms.dwTotalPhys;
+
+ OSVERSIONINFO oi;
+ oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+ GetVersionEx(&oi);
+ switch(oi.dwPlatformId) {
+ case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
+ case VER_PLATFORM_WIN32_NT: _is_nt = true; break;
+ default: fatal("Unknown platform");
+ }
+
+ _default_stack_size = os::current_stack_size();
+ assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
+ assert((_default_stack_size & (_vm_page_size - 1)) == 0,
+ "stack size not a multiple of page size");
+
+ initialize_performance_counter();
+
+ // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
+ // known to deadlock the system, if the VM issues to thread operations with
+ // a too high frequency, e.g., such as changing the priorities.
+ // The 6000 seems to work well - no deadlocks has been notices on the test
+ // programs that we have seen experience this problem.
+ if (!os::win32::is_nt()) {
+ StarvationMonitorInterval = 6000;
+ }
+}
+
+
+void os::win32::setmode_streams() {
+ _setmode(_fileno(stdin), _O_BINARY);
+ _setmode(_fileno(stdout), _O_BINARY);
+ _setmode(_fileno(stderr), _O_BINARY);
+}
+
+
+int os::message_box(const char* title, const char* message) {
+ int result = MessageBox(NULL, message, title,
+ MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
+ return result == IDYES;
+}
+
+int os::allocate_thread_local_storage() {
+ return TlsAlloc();
+}
+
+
+void os::free_thread_local_storage(int index) {
+ TlsFree(index);
+}
+
+
+void os::thread_local_storage_at_put(int index, void* value) {
+ TlsSetValue(index, value);
+ assert(thread_local_storage_at(index) == value, "Just checking");
+}
+
+
+void* os::thread_local_storage_at(int index) {
+ return TlsGetValue(index);
+}
+
+
+#ifndef PRODUCT
+#ifndef _WIN64
+// Helpers to check whether NX protection is enabled
+int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
+ if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
+ pex->ExceptionRecord->NumberParameters > 0 &&
+ pex->ExceptionRecord->ExceptionInformation[0] ==
+ EXCEPTION_INFO_EXEC_VIOLATION) {
+ return EXCEPTION_EXECUTE_HANDLER;
+ }
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+
+void nx_check_protection() {
+ // If NX is enabled we'll get an exception calling into code on the stack
+ char code[] = { (char)0xC3 }; // ret
+ void *code_ptr = (void *)code;
+ __try {
+ __asm call code_ptr
+ } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
+ tty->print_raw_cr("NX protection detected.");
+ }
+}
+#endif // _WIN64
+#endif // PRODUCT
+
+// this is called _before_ the global arguments have been parsed
+void os::init(void) {
+ _initial_pid = _getpid();
+
+ init_random(1234567);
+
+ win32::initialize_system_info();
+ win32::setmode_streams();
+ init_page_sizes((size_t) win32::vm_page_size());
+
+ // For better scalability on MP systems (must be called after initialize_system_info)
+#ifndef PRODUCT
+ if (is_MP()) {
+ NoYieldsInMicrolock = true;
+ }
+#endif
+ // Initialize main_process and main_thread
+ main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
+ if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
+ &main_thread, THREAD_ALL_ACCESS, false, 0)) {
+ fatal("DuplicateHandle failed\n");
+ }
+ main_thread_id = (int) GetCurrentThreadId();
+}
+
+// To install functions for atexit processing
+extern "C" {
+ static void perfMemory_exit_helper() {
+ perfMemory_exit();
+ }
+}
+
+
+// this is called _after_ the global arguments have been parsed
+jint os::init_2(void) {
+ // Allocate a single page and mark it as readable for safepoint polling
+ address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
+ guarantee( polling_page != NULL, "Reserve Failed for polling page");
+
+ address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
+ guarantee( return_page != NULL, "Commit Failed for polling page");
+
+ os::set_polling_page( polling_page );
+
+#ifndef PRODUCT
+ if( Verbose && PrintMiscellaneous )
+ tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
+#endif
+
+ if (!UseMembar) {
+ address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_EXECUTE_READWRITE);
+ guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
+
+ return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
+ guarantee( return_page != NULL, "Commit Failed for memory serialize page");
+
+ os::set_memory_serialize_page( mem_serialize_page );
+
+#ifndef PRODUCT
+ if(Verbose && PrintMiscellaneous)
+ tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
+#endif
+}
+
+ FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
+
+ // Setup Windows Exceptions
+
+ // On Itanium systems, Structured Exception Handling does not
+ // work since stack frames must be walkable by the OS. Since
+ // much of our code is dynamically generated, and we do not have
+ // proper unwind .xdata sections, the system simply exits
+ // rather than delivering the exception. To work around
+ // this we use VectorExceptions instead.
+#ifdef _WIN64
+ if (UseVectoredExceptions) {
+ topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
+ }
+#endif
+
+ // for debugging float code generation bugs
+ if (ForceFloatExceptions) {
+#ifndef _WIN64
+ static long fp_control_word = 0;
+ __asm { fstcw fp_control_word }
+ // see Intel PPro Manual, Vol. 2, p 7-16
+ const long precision = 0x20;
+ const long underflow = 0x10;
+ const long overflow = 0x08;
+ const long zero_div = 0x04;
+ const long denorm = 0x02;
+ const long invalid = 0x01;
+ fp_control_word |= invalid;
+ __asm { fldcw fp_control_word }
+#endif
+ }
+
+ // Initialize HPI.
+ jint hpi_result = hpi::initialize();
+ if (hpi_result != JNI_OK) { return hpi_result; }
+
+ // If stack_commit_size is 0, windows will reserve the default size,
+ // but only commit a small portion of it.
+ size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
+ size_t default_reserve_size = os::win32::default_stack_size();
+ size_t actual_reserve_size = stack_commit_size;
+ if (stack_commit_size < default_reserve_size) {
+ // If stack_commit_size == 0, we want this too
+ actual_reserve_size = default_reserve_size;
+ }
+
+ JavaThread::set_stack_size_at_create(stack_commit_size);
+
+ // Calculate theoretical max. size of Threads to guard gainst artifical
+ // out-of-memory situations, where all available address-space has been
+ // reserved by thread stacks.
+ assert(actual_reserve_size != 0, "Must have a stack");
+
+ // Calculate the thread limit when we should start doing Virtual Memory
+ // banging. Currently when the threads will have used all but 200Mb of space.
+ //
+ // TODO: consider performing a similar calculation for commit size instead
+ // as reserve size, since on a 64-bit platform we'll run into that more
+ // often than running out of virtual memory space. We can use the
+ // lower value of the two calculations as the os_thread_limit.
+ size_t max_address_space = ((size_t)1 << (BitsPerOop - 1)) - (200 * K * K);
+ win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
+
+ // at exit methods are called in the reverse order of their registration.
+ // there is no limit to the number of functions registered. atexit does
+ // not set errno.
+
+ if (PerfAllowAtExitRegistration) {
+ // only register atexit functions if PerfAllowAtExitRegistration is set.
+ // atexit functions can be delayed until process exit time, which
+ // can be problematic for embedded VM situations. Embedded VMs should
+ // call DestroyJavaVM() to assure that VM resources are released.
+
+ // note: perfMemory_exit_helper atexit function may be removed in
+ // the future if the appropriate cleanup code can be added to the
+ // VM_Exit VMOperation's doit method.
+ if (atexit(perfMemory_exit_helper) != 0) {
+ warning("os::init_2 atexit(perfMemory_exit_helper) failed");
+ }
+ }
+
+ // initialize PSAPI or ToolHelp for fatal error handler
+ if (win32::is_nt()) _init_psapi();
+ else _init_toolhelp();
+
+#ifndef _WIN64
+ // Print something if NX is enabled (win32 on AMD64)
+ NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
+#endif
+
+ // initialize thread priority policy
+ prio_init();
+
+ return JNI_OK;
+}
+
+
+// Mark the polling page as unreadable
+void os::make_polling_page_unreadable(void) {
+ DWORD old_status;
+ if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
+ fatal("Could not disable polling page");
+};
+
+// Mark the polling page as readable
+void os::make_polling_page_readable(void) {
+ DWORD old_status;
+ if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
+ fatal("Could not enable polling page");
+};
+
+
+int os::stat(const char *path, struct stat *sbuf) {
+ char pathbuf[MAX_PATH];
+ if (strlen(path) > MAX_PATH - 1) {
+ errno = ENAMETOOLONG;
+ return -1;
+ }
+ hpi::native_path(strcpy(pathbuf, path));
+ int ret = ::stat(pathbuf, sbuf);
+ if (sbuf != NULL && UseUTCFileTimestamp) {
+ // Fix for 6539723. st_mtime returned from stat() is dependent on
+ // the system timezone and so can return different values for the
+ // same file if/when daylight savings time changes. This adjustment
+ // makes sure the same timestamp is returned regardless of the TZ.
+ //
+ // See:
+ // http://msdn.microsoft.com/library/
+ // default.asp?url=/library/en-us/sysinfo/base/
+ // time_zone_information_str.asp
+ // and
+ // http://msdn.microsoft.com/library/default.asp?url=
+ // /library/en-us/sysinfo/base/settimezoneinformation.asp
+ //
+ // NOTE: there is a insidious bug here: If the timezone is changed
+ // after the call to stat() but before 'GetTimeZoneInformation()', then
+ // the adjustment we do here will be wrong and we'll return the wrong
+ // value (which will likely end up creating an invalid class data
+ // archive). Absent a better API for this, or some time zone locking
+ // mechanism, we'll have to live with this risk.
+ TIME_ZONE_INFORMATION tz;
+ DWORD tzid = GetTimeZoneInformation(&tz);
+ int daylightBias =
+ (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
+ sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
+ }
+ return ret;
+}
+
+
+#define FT2INT64(ft) \
+ ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
+
+
+// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
+// are used by JVM M&M and JVMTI to get user+sys or user CPU time
+// of a thread.
+//
+// current_thread_cpu_time() and thread_cpu_time(Thread*) returns
+// the fast estimate available on the platform.
+
+// current_thread_cpu_time() is not optimized for Windows yet
+jlong os::current_thread_cpu_time() {
+ // return user + sys since the cost is the same
+ return os::thread_cpu_time(Thread::current(), true /* user+sys */);
+}
+
+jlong os::thread_cpu_time(Thread* thread) {
+ // consistent with what current_thread_cpu_time() returns.
+ return os::thread_cpu_time(thread, true /* user+sys */);
+}
+
+jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
+ return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
+}
+
+jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
+ // This code is copy from clasic VM -> hpi::sysThreadCPUTime
+ // If this function changes, os::is_thread_cpu_time_supported() should too
+ if (os::win32::is_nt()) {
+ FILETIME CreationTime;
+ FILETIME ExitTime;
+ FILETIME KernelTime;
+ FILETIME UserTime;
+
+ if ( GetThreadTimes(thread->osthread()->thread_handle(),
+ &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
+ return -1;
+ else
+ if (user_sys_cpu_time) {
+ return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
+ } else {
+ return FT2INT64(UserTime) * 100;
+ }
+ } else {
+ return (jlong) timeGetTime() * 1000000;
+ }
+}
+
+void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
+ info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
+ info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
+ info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
+ info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
+}
+
+void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
+ info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
+ info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
+ info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
+ info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
+}
+
+bool os::is_thread_cpu_time_supported() {
+ // see os::thread_cpu_time
+ if (os::win32::is_nt()) {
+ FILETIME CreationTime;
+ FILETIME ExitTime;
+ FILETIME KernelTime;
+ FILETIME UserTime;
+
+ if ( GetThreadTimes(GetCurrentThread(),
+ &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
+ return false;
+ else
+ return true;
+ } else {
+ return false;
+ }
+}
+
+// Windows does't provide a loadavg primitive so this is stubbed out for now.
+// It does have primitives (PDH API) to get CPU usage and run queue length.
+// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
+// If we wanted to implement loadavg on Windows, we have a few options:
+//
+// a) Query CPU usage and run queue length and "fake" an answer by
+// returning the CPU usage if it's under 100%, and the run queue
+// length otherwise. It turns out that querying is pretty slow
+// on Windows, on the order of 200 microseconds on a fast machine.
+// Note that on the Windows the CPU usage value is the % usage
+// since the last time the API was called (and the first call
+// returns 100%), so we'd have to deal with that as well.
+//
+// b) Sample the "fake" answer using a sampling thread and store
+// the answer in a global variable. The call to loadavg would
+// just return the value of the global, avoiding the slow query.
+//
+// c) Sample a better answer using exponential decay to smooth the
+// value. This is basically the algorithm used by UNIX kernels.
+//
+// Note that sampling thread starvation could affect both (b) and (c).
+int os::loadavg(double loadavg[], int nelem) {
+ return -1;
+}
+
+
+// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
+bool os::dont_yield() {
+ return DontYieldALot;
+}
+
+// Is a (classpath) directory empty?
+bool os::dir_is_empty(const char* path) {
+ WIN32_FIND_DATA fd;
+ HANDLE f = FindFirstFile(path, &fd);
+ if (f == INVALID_HANDLE_VALUE) {
+ return true;
+ }
+ FindClose(f);
+ return false;
+}
+
+// create binary file, rewriting existing file if required
+int os::create_binary_file(const char* path, bool rewrite_existing) {
+ int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
+ if (!rewrite_existing) {
+ oflags |= _O_EXCL;
+ }
+ return ::open(path, oflags, _S_IREAD | _S_IWRITE);
+}
+
+// return current position of file pointer
+jlong os::current_file_offset(int fd) {
+ return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
+}
+
+// move file pointer to the specified offset
+jlong os::seek_to_file_offset(int fd, jlong offset) {
+ return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
+}
+
+
+// Map a block of memory.
+char* os::map_memory(int fd, const char* file_name, size_t file_offset,
+ char *addr, size_t bytes, bool read_only,
+ bool allow_exec) {
+ HANDLE hFile;
+ char* base;
+
+ hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
+ OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+ if (hFile == NULL) {
+ if (PrintMiscellaneous && Verbose) {
+ DWORD err = GetLastError();
+ tty->print_cr("CreateFile() failed: GetLastError->%ld.");
+ }
+ return NULL;
+ }
+
+ if (allow_exec) {
+ // CreateFileMapping/MapViewOfFileEx can't map executable memory
+ // unless it comes from a PE image (which the shared archive is not.)
+ // Even VirtualProtect refuses to give execute access to mapped memory
+ // that was not previously executable.
+ //
+ // Instead, stick the executable region in anonymous memory. Yuck.
+ // Penalty is that ~4 pages will not be shareable - in the future
+ // we might consider DLLizing the shared archive with a proper PE
+ // header so that mapping executable + sharing is possible.
+
+ base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
+ PAGE_READWRITE);
+ if (base == NULL) {
+ if (PrintMiscellaneous && Verbose) {
+ DWORD err = GetLastError();
+ tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
+ }
+ CloseHandle(hFile);
+ return NULL;
+ }
+
+ DWORD bytes_read;
+ OVERLAPPED overlapped;
+ overlapped.Offset = (DWORD)file_offset;
+ overlapped.OffsetHigh = 0;
+ overlapped.hEvent = NULL;
+ // ReadFile guarantees that if the return value is true, the requested
+ // number of bytes were read before returning.
+ bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
+ if (!res) {
+ if (PrintMiscellaneous && Verbose) {
+ DWORD err = GetLastError();
+ tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
+ }
+ release_memory(base, bytes);
+ CloseHandle(hFile);
+ return NULL;
+ }
+ } else {
+ HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
+ NULL /*file_name*/);
+ if (hMap == NULL) {
+ if (PrintMiscellaneous && Verbose) {
+ DWORD err = GetLastError();
+ tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
+ }
+ CloseHandle(hFile);
+ return NULL;
+ }
+
+ DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
+ base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
+ (DWORD)bytes, addr);
+ if (base == NULL) {
+ if (PrintMiscellaneous && Verbose) {
+ DWORD err = GetLastError();
+ tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
+ }
+ CloseHandle(hMap);
+ CloseHandle(hFile);
+ return NULL;
+ }
+
+ if (CloseHandle(hMap) == 0) {
+ if (PrintMiscellaneous && Verbose) {
+ DWORD err = GetLastError();
+ tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
+ }
+ CloseHandle(hFile);
+ return base;
+ }
+ }
+
+ if (allow_exec) {
+ DWORD old_protect;
+ DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
+ bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
+
+ if (!res) {
+ if (PrintMiscellaneous && Verbose) {
+ DWORD err = GetLastError();
+ tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
+ }
+ // Don't consider this a hard error, on IA32 even if the
+ // VirtualProtect fails, we should still be able to execute
+ CloseHandle(hFile);
+ return base;
+ }
+ }
+
+ if (CloseHandle(hFile) == 0) {
+ if (PrintMiscellaneous && Verbose) {
+ DWORD err = GetLastError();
+ tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
+ }
+ return base;
+ }
+
+ return base;
+}
+
+
+// Remap a block of memory.
+char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
+ char *addr, size_t bytes, bool read_only,
+ bool allow_exec) {
+ // This OS does not allow existing memory maps to be remapped so we
+ // have to unmap the memory before we remap it.
+ if (!os::unmap_memory(addr, bytes)) {
+ return NULL;
+ }
+
+ // There is a very small theoretical window between the unmap_memory()
+ // call above and the map_memory() call below where a thread in native
+ // code may be able to access an address that is no longer mapped.
+
+ return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
+ allow_exec);
+}
+
+
+// Unmap a block of memory.
+// Returns true=success, otherwise false.
+
+bool os::unmap_memory(char* addr, size_t bytes) {
+ BOOL result = UnmapViewOfFile(addr);
+ if (result == 0) {
+ if (PrintMiscellaneous && Verbose) {
+ DWORD err = GetLastError();
+ tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
+ }
+ return false;
+ }
+ return true;
+}
+
+void os::pause() {
+ char filename[MAX_PATH];
+ if (PauseAtStartupFile && PauseAtStartupFile[0]) {
+ jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
+ } else {
+ jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
+ }
+
+ int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+ if (fd != -1) {
+ struct stat buf;
+ close(fd);
+ while (::stat(filename, &buf) == 0) {
+ Sleep(100);
+ }
+ } else {
+ jio_fprintf(stderr,
+ "Could not open pause file '%s', continuing immediately.\n", filename);
+ }
+}
+
+// An Event wraps a win32 "CreateEvent" kernel handle.
+//
+// We have a number of choices regarding "CreateEvent" win32 handle leakage:
+//
+// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
+// field, and call CloseHandle() on the win32 event handle. Unpark() would
+// need to be modified to tolerate finding a NULL (invalid) win32 event handle.
+// In addition, an unpark() operation might fetch the handle field, but the
+// event could recycle between the fetch and the SetEvent() operation.
+// SetEvent() would either fail because the handle was invalid, or inadvertently work,
+// as the win32 handle value had been recycled. In an ideal world calling SetEvent()
+// on an stale but recycled handle would be harmless, but in practice this might
+// confuse other non-Sun code, so it's not a viable approach.
+//
+// 2: Once a win32 event handle is associated with an Event, it remains associated
+// with the Event. The event handle is never closed. This could be construed
+// as handle leakage, but only up to the maximum # of threads that have been extant
+// at any one time. This shouldn't be an issue, as windows platforms typically
+// permit a process to have hundreds of thousands of open handles.
+//
+// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
+// and release unused handles.
+//
+// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
+// It's not clear, however, that we wouldn't be trading one type of leak for another.
+//
+// 5. Use an RCU-like mechanism (Read-Copy Update).
+// Or perhaps something similar to Maged Michael's "Hazard pointers".
+//
+// We use (2).
+//
+// TODO-FIXME:
+// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
+// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
+// to recover from (or at least detect) the dreaded Windows 841176 bug.
+// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
+// into a single win32 CreateEvent() handle.
+//
+// _Event transitions in park()
+// -1 => -1 : illegal
+// 1 => 0 : pass - return immediately
+// 0 => -1 : block
+//
+// _Event serves as a restricted-range semaphore :
+// -1 : thread is blocked
+// 0 : neutral - thread is running or ready
+// 1 : signaled - thread is running or ready
+//
+// Another possible encoding of _Event would be
+// with explicit "PARKED" and "SIGNALED" bits.
+
+int os::PlatformEvent::park (jlong Millis) {
+ guarantee (_ParkHandle != NULL , "Invariant") ;
+ guarantee (Millis > 0 , "Invariant") ;
+ int v ;
+
+ // CONSIDER: defer assigning a CreateEvent() handle to the Event until
+ // the initial park() operation.
+
+ for (;;) {
+ v = _Event ;
+ if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
+ }
+ guarantee ((v == 0) || (v == 1), "invariant") ;
+ if (v != 0) return OS_OK ;
+
+ // Do this the hard way by blocking ...
+ // TODO: consider a brief spin here, gated on the success of recent
+ // spin attempts by this thread.
+ //
+ // We decompose long timeouts into series of shorter timed waits.
+ // Evidently large timo values passed in WaitForSingleObject() are problematic on some
+ // versions of Windows. See EventWait() for details. This may be superstition. Or not.
+ // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
+ // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
+ // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
+ // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
+ // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
+ // for the already waited time. This policy does not admit any new outcomes.
+ // In the future, however, we might want to track the accumulated wait time and
+ // adjust Millis accordingly if we encounter a spurious wakeup.
+
+ const int MAXTIMEOUT = 0x10000000 ;
+ DWORD rv = WAIT_TIMEOUT ;
+ while (_Event < 0 && Millis > 0) {
+ DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
+ if (Millis > MAXTIMEOUT) {
+ prd = MAXTIMEOUT ;
+ }
+ rv = ::WaitForSingleObject (_ParkHandle, prd) ;
+ assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
+ if (rv == WAIT_TIMEOUT) {
+ Millis -= prd ;
+ }
+ }
+ v = _Event ;
+ _Event = 0 ;
+ OrderAccess::fence() ;
+ // If we encounter a nearly simultanous timeout expiry and unpark()
+ // we return OS_OK indicating we awoke via unpark().
+ // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
+ return (v >= 0) ? OS_OK : OS_TIMEOUT ;
+}
+
+void os::PlatformEvent::park () {
+ guarantee (_ParkHandle != NULL, "Invariant") ;
+ // Invariant: Only the thread associated with the Event/PlatformEvent
+ // may call park().
+ int v ;
+ for (;;) {
+ v = _Event ;
+ if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
+ }
+ guarantee ((v == 0) || (v == 1), "invariant") ;
+ if (v != 0) return ;
+
+ // Do this the hard way by blocking ...
+ // TODO: consider a brief spin here, gated on the success of recent
+ // spin attempts by this thread.
+ while (_Event < 0) {
+ DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
+ assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
+ }
+
+ // Usually we'll find _Event == 0 at this point, but as
+ // an optional optimization we clear it, just in case can
+ // multiple unpark() operations drove _Event up to 1.
+ _Event = 0 ;
+ OrderAccess::fence() ;
+ guarantee (_Event >= 0, "invariant") ;
+}
+
+void os::PlatformEvent::unpark() {
+ guarantee (_ParkHandle != NULL, "Invariant") ;
+ int v ;
+ for (;;) {
+ v = _Event ; // Increment _Event if it's < 1.
+ if (v > 0) {
+ // If it's already signaled just return.
+ // The LD of _Event could have reordered or be satisfied
+ // by a read-aside from this processor's write buffer.
+ // To avoid problems execute a barrier and then
+ // ratify the value. A degenerate CAS() would also work.
+ // Viz., CAS (v+0, &_Event, v) == v).
+ OrderAccess::fence() ;
+ if (_Event == v) return ;
+ continue ;
+ }
+ if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
+ }
+ if (v < 0) {
+ ::SetEvent (_ParkHandle) ;
+ }
+}
+
+
+// JSR166
+// -------------------------------------------------------
+
+/*
+ * The Windows implementation of Park is very straightforward: Basic
+ * operations on Win32 Events turn out to have the right semantics to
+ * use them directly. We opportunistically resuse the event inherited
+ * from Monitor.
+ */
+
+
+void Parker::park(bool isAbsolute, jlong time) {
+ guarantee (_ParkEvent != NULL, "invariant") ;
+ // First, demultiplex/decode time arguments
+ if (time < 0) { // don't wait
+ return;
+ }
+ else if (time == 0) {
+ time = INFINITE;
+ }
+ else if (isAbsolute) {
+ time -= os::javaTimeMillis(); // convert to relative time
+ if (time <= 0) // already elapsed
+ return;
+ }
+ else { // relative
+ time /= 1000000; // Must coarsen from nanos to millis
+ if (time == 0) // Wait for the minimal time unit if zero
+ time = 1;
+ }
+
+ JavaThread* thread = (JavaThread*)(Thread::current());
+ assert(thread->is_Java_thread(), "Must be JavaThread");
+ JavaThread *jt = (JavaThread *)thread;
+
+ // Don't wait if interrupted or already triggered
+ if (Thread::is_interrupted(thread, false) ||
+ WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
+ ResetEvent(_ParkEvent);
+ return;
+ }
+ else {
+ ThreadBlockInVM tbivm(jt);
+ OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
+ jt->set_suspend_equivalent();
+
+ WaitForSingleObject(_ParkEvent, time);
+ ResetEvent(_ParkEvent);
+
+ // If externally suspended while waiting, re-suspend
+ if (jt->handle_special_suspend_equivalent_condition()) {
+ jt->java_suspend_self();
+ }
+ }
+}
+
+void Parker::unpark() {
+ guarantee (_ParkEvent != NULL, "invariant") ;
+ SetEvent(_ParkEvent);
+}
+
+// Run the specified command in a separate process. Return its exit value,
+// or -1 on failure (e.g. can't create a new process).
+int os::fork_and_exec(char* cmd) {
+ STARTUPINFO si;
+ PROCESS_INFORMATION pi;
+
+ memset(&si, 0, sizeof(si));
+ si.cb = sizeof(si);
+ memset(&pi, 0, sizeof(pi));
+ BOOL rslt = CreateProcess(NULL, // executable name - use command line
+ cmd, // command line
+ NULL, // process security attribute
+ NULL, // thread security attribute
+ TRUE, // inherits system handles
+ 0, // no creation flags
+ NULL, // use parent's environment block
+ NULL, // use parent's starting directory
+ &si, // (in) startup information
+ &pi); // (out) process information
+
+ if (rslt) {
+ // Wait until child process exits.
+ WaitForSingleObject(pi.hProcess, INFINITE);
+
+ DWORD exit_code;
+ GetExitCodeProcess(pi.hProcess, &exit_code);
+
+ // Close process and thread handles.
+ CloseHandle(pi.hProcess);
+ CloseHandle(pi.hThread);
+
+ return (int)exit_code;
+ } else {
+ return -1;
+ }
+}
+
+//--------------------------------------------------------------------------------------------------
+// Non-product code
+
+static int mallocDebugIntervalCounter = 0;
+static int mallocDebugCounter = 0;
+bool os::check_heap(bool force) {
+ if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
+ if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
+ // Note: HeapValidate executes two hardware breakpoints when it finds something
+ // wrong; at these points, eax contains the address of the offending block (I think).
+ // To get to the exlicit error message(s) below, just continue twice.
+ HANDLE heap = GetProcessHeap();
+ { HeapLock(heap);
+ PROCESS_HEAP_ENTRY phe;
+ phe.lpData = NULL;
+ while (HeapWalk(heap, &phe) != 0) {
+ if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
+ !HeapValidate(heap, 0, phe.lpData)) {
+ tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
+ tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
+ fatal("corrupted C heap");
+ }
+ }
+ int err = GetLastError();
+ if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
+ fatal1("heap walk aborted with error %d", err);
+ }
+ HeapUnlock(heap);
+ }
+ mallocDebugIntervalCounter = 0;
+ }
+ return true;
+}
+
+
+#ifndef PRODUCT
+bool os::find(address addr) {
+ // Nothing yet
+ return false;
+}
+#endif
+
+LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
+ DWORD exception_code = e->ExceptionRecord->ExceptionCode;
+
+ if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
+ JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
+ PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
+ address addr = (address) exceptionRecord->ExceptionInformation[1];
+
+ if (os::is_memory_serialize_page(thread, addr))
+ return EXCEPTION_CONTINUE_EXECUTION;
+ }
+
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+
+static int getLastErrorString(char *buf, size_t len)
+{
+ long errval;
+
+ if ((errval = GetLastError()) != 0)
+ {
+ /* DOS error */
+ size_t n = (size_t)FormatMessage(
+ FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
+ NULL,
+ errval,
+ 0,
+ buf,
+ (DWORD)len,
+ NULL);
+ if (n > 3) {
+ /* Drop final '.', CR, LF */
+ if (buf[n - 1] == '\n') n--;
+ if (buf[n - 1] == '\r') n--;
+ if (buf[n - 1] == '.') n--;
+ buf[n] = '\0';
+ }
+ return (int)n;
+ }
+
+ if (errno != 0)
+ {
+ /* C runtime error that has no corresponding DOS error code */
+ const char *s = strerror(errno);
+ size_t n = strlen(s);
+ if (n >= len) n = len - 1;
+ strncpy(buf, s, n);
+ buf[n] = '\0';
+ return (int)n;
+ }
+ return 0;
+}