--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os/windows/os_windows.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,5401 @@
+/*
+ * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+// Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
+#define _WIN32_WINNT 0x0600
+
+// no precompiled headers
+#include "classfile/classLoader.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "classfile/vmSymbols.hpp"
+#include "code/icBuffer.hpp"
+#include "code/vtableStubs.hpp"
+#include "compiler/compileBroker.hpp"
+#include "compiler/disassembler.hpp"
+#include "interpreter/interpreter.hpp"
+#include "jvm_windows.h"
+#include "logging/log.hpp"
+#include "memory/allocation.inline.hpp"
+#include "memory/filemap.hpp"
+#include "oops/oop.inline.hpp"
+#include "os_share_windows.hpp"
+#include "os_windows.inline.hpp"
+#include "prims/jniFastGetField.hpp"
+#include "prims/jvm.h"
+#include "prims/jvm_misc.hpp"
+#include "runtime/arguments.hpp"
+#include "runtime/atomic.hpp"
+#include "runtime/extendedPC.hpp"
+#include "runtime/globals.hpp"
+#include "runtime/interfaceSupport.hpp"
+#include "runtime/java.hpp"
+#include "runtime/javaCalls.hpp"
+#include "runtime/mutexLocker.hpp"
+#include "runtime/objectMonitor.hpp"
+#include "runtime/orderAccess.inline.hpp"
+#include "runtime/osThread.hpp"
+#include "runtime/perfMemory.hpp"
+#include "runtime/sharedRuntime.hpp"
+#include "runtime/statSampler.hpp"
+#include "runtime/stubRoutines.hpp"
+#include "runtime/thread.inline.hpp"
+#include "runtime/threadCritical.hpp"
+#include "runtime/timer.hpp"
+#include "runtime/vm_version.hpp"
+#include "semaphore_windows.hpp"
+#include "services/attachListener.hpp"
+#include "services/memTracker.hpp"
+#include "services/runtimeService.hpp"
+#include "utilities/align.hpp"
+#include "utilities/decoder.hpp"
+#include "utilities/defaultStream.hpp"
+#include "utilities/events.hpp"
+#include "utilities/growableArray.hpp"
+#include "utilities/macros.hpp"
+#include "utilities/vmError.hpp"
+#include "windbghelp.hpp"
+
+
+#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 <vdmdbg.h>
+
+// for timer info max values which include all bits
+#define ALL_64_BITS CONST64(-1)
+
+// 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 _M_AMD64
+ #define __CPU__ amd64
+#else
+ #define __CPU__ i486
+#endif
+
+// save DLL module handle, used by GetModuleFileName
+
+HINSTANCE vm_lib_handle;
+
+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);
+ }
+ 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::unsetenv(const char* name) {
+ assert(name != NULL, "Null pointer");
+ return (SetEnvironmentVariable(name, NULL) == TRUE);
+}
+
+// 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;
+}
+
+// previous UnhandledExceptionFilter, if there is one
+static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
+
+LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
+
+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 + 1];
+ char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
+
+ if (alt_home_dir != NULL) {
+ strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
+ home_dir[MAX_PATH] = '\0';
+ } else {
+ os::jvm_path(home_dir, sizeof(home_dir));
+ // Found the full path to jvm.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, mtInternal);
+ if (home_path == NULL) {
+ return;
+ }
+ strcpy(home_path, home_dir);
+ Arguments::set_java_home(home_path);
+ FREE_C_HEAP_ARRAY(char, home_path);
+
+ dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
+ mtInternal);
+ if (dll_path == NULL) {
+ return;
+ }
+ strcpy(dll_path, home_dir);
+ strcat(dll_path, bin);
+ Arguments::set_dll_dir(dll_path);
+ FREE_C_HEAP_ARRAY(char, 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 system wide Java Extensions directory (Java only)
+ // 3. System directory (GetSystemDirectory)
+ // 4. Windows directory (GetWindowsDirectory)
+ // 5. The PATH environment variable
+ // 6. The current directory
+
+ 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, mtInternal);
+
+ library_path[0] = '\0';
+
+ GetModuleFileName(NULL, tmp, sizeof(tmp));
+ *(strrchr(tmp, '\\')) = '\0';
+ strcat(library_path, tmp);
+
+ 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);
+ }
+
+ strcat(library_path, ";.");
+
+ 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
+
+#ifndef _WIN64
+ // set our UnhandledExceptionFilter and save any previous one
+ prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
+#endif
+
+ // Done
+ return;
+}
+
+void os::breakpoint() {
+ DebugBreak();
+}
+
+// Invoked from the BREAKPOINT Macro
+extern "C" void breakpoint() {
+ os::breakpoint();
+}
+
+// RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
+// So far, this method is only used by Native Memory Tracking, which is
+// only supported on Windows XP or later.
+//
+int os::get_native_stack(address* stack, int frames, int toSkip) {
+ int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
+ for (int index = captured; index < frames; index ++) {
+ stack[index] = NULL;
+ }
+ return captured;
+}
+
+
+// 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;
+ }
+ }
+ 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;
+}
+
+struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
+ const struct tm* time_struct_ptr = localtime(clock);
+ if (time_struct_ptr != NULL) {
+ *res = *time_struct_ptr;
+ return res;
+ }
+ return NULL;
+}
+
+struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
+ const struct tm* time_struct_ptr = gmtime(clock);
+ if (time_struct_ptr != NULL) {
+ *res = *time_struct_ptr;
+ return res;
+ }
+ return NULL;
+}
+
+LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
+
+// Thread start routine for all newly created threads
+static unsigned __stdcall thread_native_entry(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);
+
+ thread->initialize_thread_current();
+
+ 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);
+ }
+ }
+
+ // Diagnostic code to investigate JDK-6573254
+ int res = 30115; // non-java thread
+ if (thread->is_Java_thread()) {
+ res = 20115; // java thread
+ }
+
+ log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
+
+ // Install a win32 structured exception handler around every thread created
+ // by VM, so VM can generate 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.
+ }
+
+ log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
+
+ // 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);
+ }
+
+ // If a thread has not deleted itself ("delete this") as part of its
+ // termination sequence, we have to ensure thread-local-storage is
+ // cleared before we actually terminate. No threads should ever be
+ // deleted asynchronously with respect to their termination.
+ if (Thread::current_or_null_safe() != NULL) {
+ assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
+ thread->clear_thread_current();
+ }
+
+ // Thread must not return from exit_process_or_thread(), but if it does,
+ // let it proceed to exit normally
+ return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
+}
+
+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);
+
+ log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
+ os::current_thread_id());
+
+ 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;
+}
+
+// Helper function to trace _beginthreadex attributes,
+// similar to os::Posix::describe_pthread_attr()
+static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
+ size_t stacksize, unsigned initflag) {
+ stringStream ss(buf, buflen);
+ if (stacksize == 0) {
+ ss.print("stacksize: default, ");
+ } else {
+ ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
+ }
+ ss.print("flags: ");
+ #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
+ #define ALL(X) \
+ X(CREATE_SUSPENDED) \
+ X(STACK_SIZE_PARAM_IS_A_RESERVATION)
+ ALL(PRINT_FLAG)
+ #undef ALL
+ #undef PRINT_FLAG
+ return buf;
+}
+
+// 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.
+
+ const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
+ HANDLE thread_handle =
+ (HANDLE)_beginthreadex(NULL,
+ (unsigned)stack_size,
+ (unsigned (__stdcall *)(void*)) thread_native_entry,
+ thread,
+ initflag,
+ &thread_id);
+
+ char buf[64];
+ if (thread_handle != NULL) {
+ log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
+ thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
+ } else {
+ log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
+ os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
+ }
+
+ 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");
+
+ // We are told to free resources of the argument thread,
+ // but we can only really operate on the current thread.
+ assert(Thread::current()->osthread() == osthread,
+ "os::free_thread but not current thread");
+
+ CloseHandle(osthread->thread_handle());
+ CloseHandle(osthread->interrupt_event());
+ delete osthread;
+}
+
+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;
+ QueryPerformanceCounter(&count);
+ return as_long(count) - initial_performance_count;
+}
+
+
+jlong os::elapsed_frequency() {
+ return performance_frequency;
+}
+
+
+julong os::available_memory() {
+ return win32::available_memory();
+}
+
+julong os::win32::available_memory() {
+ // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
+ // value if total memory is larger than 4GB
+ MEMORYSTATUSEX ms;
+ ms.dwLength = sizeof(ms);
+ GlobalMemoryStatusEx(&ms);
+
+ return (julong)ms.ullAvailPhys;
+}
+
+julong os::physical_memory() {
+ return win32::physical_memory();
+}
+
+bool os::has_allocatable_memory_limit(julong* limit) {
+ MEMORYSTATUSEX ms;
+ ms.dwLength = sizeof(ms);
+ GlobalMemoryStatusEx(&ms);
+#ifdef _LP64
+ *limit = (julong)ms.ullAvailVirtual;
+ return true;
+#else
+ // Limit to 1400m because of the 2gb address space wall
+ *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
+ return true;
+#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;
+ }
+}
+
+void os::set_native_thread_name(const char *name) {
+
+ // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
+ //
+ // Note that unfortunately this only works if the process
+ // is already attached to a debugger; debugger must observe
+ // the exception below to show the correct name.
+
+ // If there is no debugger attached skip raising the exception
+ if (!IsDebuggerPresent()) {
+ return;
+ }
+
+ const DWORD MS_VC_EXCEPTION = 0x406D1388;
+ struct {
+ DWORD dwType; // must be 0x1000
+ LPCSTR szName; // pointer to name (in user addr space)
+ DWORD dwThreadID; // thread ID (-1=caller thread)
+ DWORD dwFlags; // reserved for future use, must be zero
+ } info;
+
+ info.dwType = 0x1000;
+ info.szName = name;
+ info.dwThreadID = -1;
+ info.dwFlags = 0;
+
+ __try {
+ RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
+ } __except(EXCEPTION_EXECUTE_HANDLER) {}
+}
+
+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;
+}
+
+void os::win32::initialize_performance_counter() {
+ LARGE_INTEGER count;
+ QueryPerformanceFrequency(&count);
+ performance_frequency = as_long(count);
+ QueryPerformanceCounter(&count);
+ initial_performance_count = as_long(count);
+}
+
+
+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)) {
+ fatal("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;
+}
+
+// Returns time ticks in (10th of micro seconds)
+jlong windows_to_time_ticks(FILETIME wt) {
+ jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
+ return (a - offset());
+}
+
+FILETIME java_to_windows_time(jlong l) {
+ jlong a = (l * 10000) + offset();
+ FILETIME result;
+ result.dwHighDateTime = high(a);
+ result.dwLowDateTime = low(a);
+ return result;
+}
+
+bool os::supports_vtime() { return true; }
+bool os::enable_vtime() { return false; }
+bool os::vtime_enabled() { return false; }
+
+double os::elapsedVTime() {
+ FILETIME created;
+ FILETIME exited;
+ FILETIME kernel;
+ FILETIME user;
+ if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
+ // the resolution of windows_to_java_time() should be sufficient (ms)
+ return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
+ } else {
+ return elapsedTime();
+ }
+}
+
+jlong os::javaTimeMillis() {
+ if (UseFakeTimers) {
+ return fake_time++;
+ } else {
+ FILETIME wt;
+ GetSystemTimeAsFileTime(&wt);
+ return windows_to_java_time(wt);
+ }
+}
+
+void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
+ FILETIME wt;
+ GetSystemTimeAsFileTime(&wt);
+ jlong ticks = windows_to_time_ticks(wt); // 10th of micros
+ jlong secs = jlong(ticks / 10000000); // 10000 * 1000
+ seconds = secs;
+ nanos = jlong(ticks - (secs*10000000)) * 100;
+}
+
+jlong os::javaTimeNanos() {
+ LARGE_INTEGER current_count;
+ QueryPerformanceCounter(¤t_count);
+ double current = as_long(current_count);
+ double freq = performance_frequency;
+ jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
+ return time;
+}
+
+void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
+ jlong freq = performance_frequency;
+ if (freq < NANOSECS_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 > NANOSECS_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 / NANOSECS_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);
+ *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
+ *process_user_time =
+ (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
+ *process_system_time =
+ (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
+ 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();
+ }
+}
+
+
+static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
+ PMINIDUMP_EXCEPTION_INFORMATION,
+ PMINIDUMP_USER_STREAM_INFORMATION,
+ PMINIDUMP_CALLBACK_INFORMATION);
+
+static HANDLE dumpFile = NULL;
+
+// Check if dump file can be created.
+void os::check_dump_limit(char* buffer, size_t buffsz) {
+ bool status = true;
+ if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
+ jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
+ status = false;
+ }
+
+#ifndef ASSERT
+ if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
+ jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
+ status = false;
+ }
+#endif
+
+ if (status) {
+ const char* cwd = get_current_directory(NULL, 0);
+ int pid = current_process_id();
+ if (cwd != NULL) {
+ jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
+ } else {
+ jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
+ }
+
+ if (dumpFile == NULL &&
+ (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
+ == INVALID_HANDLE_VALUE) {
+ jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
+ status = false;
+ }
+ }
+ VMError::record_coredump_status(buffer, status);
+}
+
+void os::abort(bool dump_core, void* siginfo, const void* context) {
+ EXCEPTION_POINTERS ep;
+ MINIDUMP_EXCEPTION_INFORMATION mei;
+ MINIDUMP_EXCEPTION_INFORMATION* pmei;
+
+ HANDLE hProcess = GetCurrentProcess();
+ DWORD processId = GetCurrentProcessId();
+ MINIDUMP_TYPE dumpType;
+
+ shutdown();
+ if (!dump_core || dumpFile == NULL) {
+ if (dumpFile != NULL) {
+ CloseHandle(dumpFile);
+ }
+ win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
+ }
+
+ dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
+ MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
+
+ if (siginfo != NULL && context != NULL) {
+ ep.ContextRecord = (PCONTEXT) context;
+ ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
+
+ mei.ThreadId = GetCurrentThreadId();
+ mei.ExceptionPointers = &ep;
+ pmei = &mei;
+ } else {
+ pmei = NULL;
+ }
+
+ // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
+ // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
+ if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) &&
+ !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) {
+ jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
+ }
+ CloseHandle(dumpFile);
+ win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
+}
+
+// Die immediately, no exit hook, no abort hook, no cleanup.
+void os::die() {
+ win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -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), mtInternal);
+ 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, mtInternal);
+ 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;
+}
+
+// This must be hard coded because it's the system's temporary
+// directory not the java application's temp directory, ala java.io.tmpdir.
+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, size_t buflen) {
+ int n = static_cast<int>(buflen);
+ if (buflen > INT_MAX) n = INT_MAX;
+ return _getcwd(buf, n);
+}
+
+//-----------------------------------------------------------
+// Helper functions for fatal error handler
+#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
+
+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(const char * mod_fname, address base_addr,
+ address top_address, void * param) {
+ struct _modinfo *pmod = (struct _modinfo *)param;
+ if (!pmod) return -1;
+
+ if (base_addr <= pmod->addr &&
+ top_address > 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) {
+ // buf is not optional, but offset is optional
+ assert(buf != NULL, "sanity check");
+
+// 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;
+ if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
+ // buf already contains path name
+ if (offset) *offset = addr - mi.base_addr;
+ return true;
+ }
+
+ buf[0] = '\0';
+ if (offset) *offset = -1;
+ return false;
+}
+
+bool os::dll_address_to_function_name(address addr, char *buf,
+ int buflen, int *offset,
+ bool demangle) {
+ // buf is not optional, but offset is optional
+ assert(buf != NULL, "sanity check");
+
+ if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
+ return true;
+ }
+ if (offset != NULL) *offset = -1;
+ 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(const char* mod_fname, address base_addr,
+ address top_address, void * param) {
+ if (!param) return -1;
+
+ if (base_addr <= (address)_locate_jvm_dll &&
+ top_address > (address)_locate_jvm_dll) {
+ ((address*)param)[0] = base_addr;
+ ((address*)param)[1] = top_address;
+ 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]) {
+ if (!get_loaded_modules_info(_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(const char* fname, address base_address,
+ address top_address, void* param) {
+ if (!param) return -1;
+
+ outputStream* st = (outputStream*)param;
+
+ st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, 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;
+ }
+
+ DWORD 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 os::lasterror 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)
+ lasterror(ebuf, (size_t) ebuflen);
+ ebuf[ebuflen - 1] = '\0';
+ int fd = ::open(name, O_RDONLY | O_BINARY, 0);
+ if (fd < 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(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
+ ||
+ // Read location of signature
+ (sizeof(signature_offset) !=
+ (os::read(fd, (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(fd,
+ signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
+ ||
+ // Read field that contains code of architecture
+ // that dll was built for
+ (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
+ );
+
+ ::close(fd);
+ if (failed_to_get_lib_arch) {
+ // file i/o error - report os::lasterror(...) 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"}
+ };
+#if (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_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 running architecture code in arch_array");
+
+ // If the architecture is right
+ // but some other error took place - report os::lasterror(...) 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) {
+ st->print_cr("Dynamic libraries:");
+ get_loaded_modules_info(_print_module, (void *)st);
+}
+
+int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
+ HANDLE hProcess;
+
+# define MAX_NUM_MODULES 128
+ HMODULE modules[MAX_NUM_MODULES];
+ static char filename[MAX_PATH];
+ int result = 0;
+
+ int pid = os::current_process_id();
+ 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 = callback(filename, (address)modinfo.lpBaseOfDll,
+ (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
+ if (result) break;
+ }
+
+ CloseHandle(hProcess);
+ return result;
+}
+
+bool os::get_host_name(char* buf, size_t buflen) {
+ DWORD size = (DWORD)buflen;
+ return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
+}
+
+void os::get_summary_os_info(char* buf, size_t buflen) {
+ stringStream sst(buf, buflen);
+ os::win32::print_windows_version(&sst);
+ // chop off newline character
+ char* nl = strchr(buf, '\n');
+ if (nl != NULL) *nl = '\0';
+}
+
+int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
+ int ret = vsnprintf(buf, len, fmt, args);
+ // Get the correct buffer size if buf is too small
+ if (ret < 0) {
+ return _vscprintf(fmt, args);
+ }
+ return ret;
+}
+
+static inline time_t get_mtime(const char* filename) {
+ struct stat st;
+ int ret = os::stat(filename, &st);
+ assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
+ return st.st_mtime;
+}
+
+int os::compare_file_modified_times(const char* file1, const char* file2) {
+ time_t t1 = get_mtime(file1);
+ time_t t2 = get_mtime(file2);
+ return t1 - t2;
+}
+
+void os::print_os_info_brief(outputStream* st) {
+ os::print_os_info(st);
+}
+
+void os::print_os_info(outputStream* st) {
+#ifdef ASSERT
+ char buffer[1024];
+ st->print("HostName: ");
+ if (get_host_name(buffer, sizeof(buffer))) {
+ st->print("%s ", buffer);
+ } else {
+ st->print("N/A ");
+ }
+#endif
+ st->print("OS:");
+ os::win32::print_windows_version(st);
+}
+
+void os::win32::print_windows_version(outputStream* st) {
+ OSVERSIONINFOEX osvi;
+ VS_FIXEDFILEINFO *file_info;
+ TCHAR kernel32_path[MAX_PATH];
+ UINT len, ret;
+
+ // Use the GetVersionEx information to see if we're on a server or
+ // workstation edition of Windows. Starting with Windows 8.1 we can't
+ // trust the OS version information returned by this API.
+ ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
+ osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
+ if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
+ st->print_cr("Call to GetVersionEx failed");
+ return;
+ }
+ bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
+
+ // Get the full path to \Windows\System32\kernel32.dll and use that for
+ // determining what version of Windows we're running on.
+ len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
+ ret = GetSystemDirectory(kernel32_path, len);
+ if (ret == 0 || ret > len) {
+ st->print_cr("Call to GetSystemDirectory failed");
+ return;
+ }
+ strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
+
+ DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
+ if (version_size == 0) {
+ st->print_cr("Call to GetFileVersionInfoSize failed");
+ return;
+ }
+
+ LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
+ if (version_info == NULL) {
+ st->print_cr("Failed to allocate version_info");
+ return;
+ }
+
+ if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
+ os::free(version_info);
+ st->print_cr("Call to GetFileVersionInfo failed");
+ return;
+ }
+
+ if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
+ os::free(version_info);
+ st->print_cr("Call to VerQueryValue failed");
+ return;
+ }
+
+ int major_version = HIWORD(file_info->dwProductVersionMS);
+ int minor_version = LOWORD(file_info->dwProductVersionMS);
+ int build_number = HIWORD(file_info->dwProductVersionLS);
+ int build_minor = LOWORD(file_info->dwProductVersionLS);
+ int os_vers = major_version * 1000 + minor_version;
+ os::free(version_info);
+
+ st->print(" Windows ");
+ switch (os_vers) {
+
+ case 6000:
+ if (is_workstation) {
+ st->print("Vista");
+ } else {
+ st->print("Server 2008");
+ }
+ break;
+
+ case 6001:
+ if (is_workstation) {
+ st->print("7");
+ } else {
+ st->print("Server 2008 R2");
+ }
+ break;
+
+ case 6002:
+ if (is_workstation) {
+ st->print("8");
+ } else {
+ st->print("Server 2012");
+ }
+ break;
+
+ case 6003:
+ if (is_workstation) {
+ st->print("8.1");
+ } else {
+ st->print("Server 2012 R2");
+ }
+ break;
+
+ case 10000:
+ if (is_workstation) {
+ st->print("10");
+ } else {
+ st->print("Server 2016");
+ }
+ break;
+
+ default:
+ // Unrecognized windows, print out its major and minor versions
+ st->print("%d.%d", major_version, minor_version);
+ break;
+ }
+
+ // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
+ // find out whether we are running on 64 bit processor or not
+ SYSTEM_INFO si;
+ ZeroMemory(&si, sizeof(SYSTEM_INFO));
+ GetNativeSystemInfo(&si);
+ if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
+ st->print(" , 64 bit");
+ }
+
+ st->print(" Build %d", build_number);
+ st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
+ st->cr();
+}
+
+void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
+ // Nothing to do for now.
+}
+
+void os::get_summary_cpu_info(char* buf, size_t buflen) {
+ HKEY key;
+ DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
+ "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
+ if (status == ERROR_SUCCESS) {
+ DWORD size = (DWORD)buflen;
+ status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
+ if (status != ERROR_SUCCESS) {
+ strncpy(buf, "## __CPU__", buflen);
+ }
+ RegCloseKey(key);
+ } else {
+ // Put generic cpu info to return
+ strncpy(buf, "## __CPU__", buflen);
+ }
+}
+
+void os::print_memory_info(outputStream* st) {
+ st->print("Memory:");
+ st->print(" %dk page", os::vm_page_size()>>10);
+
+ // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
+ // value if total memory is larger than 4GB
+ MEMORYSTATUSEX ms;
+ ms.dwLength = sizeof(ms);
+ GlobalMemoryStatusEx(&ms);
+
+ st->print(", physical %uk", os::physical_memory() >> 10);
+ st->print("(%uk free)", os::available_memory() >> 10);
+
+ st->print(", swap %uk", ms.ullTotalPageFile >> 10);
+ st->print("(%uk free)", ms.ullAvailPageFile >> 10);
+ st->cr();
+}
+
+void os::print_siginfo(outputStream *st, const void* siginfo) {
+ const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
+ st->print("siginfo:");
+
+ char tmp[64];
+ if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
+ strcpy(tmp, "EXCEPTION_??");
+ }
+ st->print(" %s (0x%x)", tmp, er->ExceptionCode);
+
+ if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
+ er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
+ er->NumberParameters >= 2) {
+ switch (er->ExceptionInformation[0]) {
+ case 0: st->print(", reading address"); break;
+ case 1: st->print(", writing address"); break;
+ case 8: st->print(", data execution prevention violation at address"); break;
+ default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
+ er->ExceptionInformation[0]);
+ }
+ st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
+ } 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
+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;
+ }
+
+ buf[0] = '\0';
+ if (Arguments::sun_java_launcher_is_altjvm()) {
+ // Support for the java launcher's '-XXaltjvm=<path>' option. Check
+ // for a JAVA_HOME environment variable and fix up the path so it
+ // looks like jvm.dll is installed there (append a fake suffix
+ // hotspot/jvm.dll).
+ char* java_home_var = ::getenv("JAVA_HOME");
+ if (java_home_var != NULL && java_home_var[0] != 0 &&
+ strlen(java_home_var) < (size_t)buflen) {
+ strncpy(buf, java_home_var, buflen);
+
+ // determine if this is a legacy image or modules image
+ // modules image doesn't have "jre" subdirectory
+ size_t len = strlen(buf);
+ char* jrebin_p = buf + len;
+ jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
+ if (0 != _access(buf, 0)) {
+ jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
+ }
+ len = strlen(buf);
+ jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
+ }
+ }
+
+ if (buf[0] == '\0') {
+ GetModuleFileName(vm_lib_handle, buf, buflen);
+ }
+ strncpy(saved_jvm_path, buf, MAX_PATH);
+ saved_jvm_path[MAX_PATH - 1] = '\0';
+}
+
+
+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
+}
+
+// This method is a copy of JDK's sysGetLastErrorString
+// from src/windows/hpi/src/system_md.c
+
+size_t os::lasterror(char* buf, size_t len) {
+ DWORD 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 n;
+ }
+
+ if (errno != 0) {
+ // C runtime error that has no corresponding DOS error code
+ const char* s = os::strerror(errno);
+ size_t n = strlen(s);
+ if (n >= len) n = len - 1;
+ strncpy(buf, s, n);
+ buf[n] = '\0';
+ return n;
+ }
+
+ return 0;
+}
+
+int os::get_last_error() {
+ DWORD error = GetLastError();
+ if (error == 0) {
+ error = errno;
+ }
+ return (int)error;
+}
+
+WindowsSemaphore::WindowsSemaphore(uint value) {
+ _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
+
+ guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
+}
+
+WindowsSemaphore::~WindowsSemaphore() {
+ ::CloseHandle(_semaphore);
+}
+
+void WindowsSemaphore::signal(uint count) {
+ if (count > 0) {
+ BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
+
+ assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
+ }
+}
+
+void WindowsSemaphore::wait() {
+ DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
+ assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
+ assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
+}
+
+bool WindowsSemaphore::trywait() {
+ DWORD ret = ::WaitForSingleObject(_semaphore, 0);
+ assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
+ return ret == WAIT_OBJECT_0;
+}
+
+// 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 (VMError::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_LOGOFF_EVENT: {
+ // Don't terminate JVM if it is running in a non-interactive session,
+ // such as a service process.
+ USEROBJECTFLAGS flags;
+ HANDLE handle = GetProcessWindowStation();
+ if (handle != NULL &&
+ GetUserObjectInformation(handle, UOI_FLAGS, &flags,
+ sizeof(USEROBJECTFLAGS), NULL)) {
+ // If it is a non-interactive session, let next handler to deal
+ // with it.
+ if ((flags.dwFlags & WSF_VISIBLE) == 0) {
+ return FALSE;
+ }
+ }
+ }
+ case CTRL_CLOSE_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 = NULL;
+
+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;
+ if (sig_sem != NULL) {
+ 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*) Thread::current_or_null();
+ // Save pc in thread
+#ifdef _M_AMD64
+ // Do not blow up if no thread info available.
+ if (thread) {
+ thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
+ }
+ // Set pc to handler
+ exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
+#else
+ // Do not blow up if no thread info available.
+ if (thread) {
+ thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
+ }
+ // Set pc to handler
+ exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)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
+
+// Windows Vista/2008 heap corruption check
+#define EXCEPTION_HEAP_CORRUPTION 0xC0000374
+
+// All Visual C++ exceptions thrown from code generated by the Microsoft Visual
+// C++ compiler contain this error code. Because this is a compiler-generated
+// error, the code is not listed in the Win32 API header files.
+// The code is actually a cryptic mnemonic device, with the initial "E"
+// standing for "exception" and the final 3 bytes (0x6D7363) representing the
+// ASCII values of "msc".
+
+#define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
+
+#define def_excpt(val) { #val, (val) }
+
+static const struct { char* name; uint number; } 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),
+ def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
+ def_excpt(EXCEPTION_HEAP_CORRUPTION)
+};
+
+#undef def_excpt
+
+const char* os::exception_name(int exception_code, char *buf, size_t size) {
+ uint code = static_cast<uint>(exception_code);
+ for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
+ if (exceptlabels[i].number == 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_AMD64
+ PCONTEXT ctx = exceptionInfo->ContextRecord;
+ address pc = (address)ctx->Rip;
+ assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
+ assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
+ if (pc[0] == 0xF7) {
+ // set correct result values and continue after idiv instruction
+ ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
+ } else {
+ ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
+ }
+ // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
+ // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
+ // idiv opcode (0xF7).
+ ctx->Rdx = (DWORD)0; // remainder
+ // Continue the execution
+#else
+ PCONTEXT ctx = exceptionInfo->ContextRecord;
+ address pc = (address)ctx->Eip;
+ 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;
+}
+
+//-----------------------------------------------------------------------------
+LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
+ PCONTEXT ctx = exceptionInfo->ContextRecord;
+#ifndef _WIN64
+ // handle exception caused by native method modifying control word
+ 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;
+ }
+ }
+
+ if (prev_uef_handler != NULL) {
+ // We didn't handle this exception so pass it to the previous
+ // UnhandledExceptionFilter.
+ return (prev_uef_handler)(exceptionInfo);
+ }
+#else // !_WIN64
+ // On Windows, the mxcsr control bits are non-volatile across calls
+ // See also CR 6192333
+ //
+ 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
+
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+
+static inline void report_error(Thread* t, DWORD exception_code,
+ address addr, void* siginfo, void* context) {
+ VMError::report_and_die(t, exception_code, addr, siginfo, context);
+
+ // If UseOsErrorReporting, this will return here and save the error file
+ // somewhere where we can find it in the minidump.
+}
+
+bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
+ struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
+ PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+ address addr = (address) exceptionRecord->ExceptionInformation[1];
+ if (Interpreter::contains(pc)) {
+ *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
+ if (!fr->is_first_java_frame()) {
+ // get_frame_at_stack_banging_point() is only called when we
+ // have well defined stacks so java_sender() calls do not need
+ // to assert safe_for_sender() first.
+ *fr = fr->java_sender();
+ }
+ } else {
+ // more complex code with compiled code
+ assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
+ CodeBlob* cb = CodeCache::find_blob(pc);
+ if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
+ // Not sure where the pc points to, fallback to default
+ // stack overflow handling
+ return false;
+ } else {
+ *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
+ // in compiled code, the stack banging is performed just after the return pc
+ // has been pushed on the stack
+ *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
+ if (!fr->is_java_frame()) {
+ // See java_sender() comment above.
+ *fr = fr->java_sender();
+ }
+ }
+ }
+ assert(fr->is_java_frame(), "Safety check");
+ return true;
+}
+
+//-----------------------------------------------------------------------------
+LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
+ if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
+ DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
+#ifdef _M_AMD64
+ address pc = (address) exceptionInfo->ContextRecord->Rip;
+#else
+ address pc = (address) exceptionInfo->ContextRecord->Eip;
+#endif
+ Thread* t = Thread::current_or_null_safe();
+
+ // Handle SafeFetch32 and SafeFetchN exceptions.
+ if (StubRoutines::is_safefetch_fault(pc)) {
+ return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
+ }
+
+#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_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))) {
+
+ // Set memory to RWX and retry
+ address page_start = align_down(addr, page_size);
+ bool res = os::protect_memory((char*) page_start, page_size,
+ os::MEM_PROT_RWX);
+
+ log_debug(os)("Execution protection violation "
+ "at " INTPTR_FORMAT
+ ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
+ p2i(page_start), (res ? "success" : os::strerror(errno)));
+
+ // 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) {
+ if (t != NULL && t->is_Java_thread()) {
+ 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 ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
+ VM_Version::is_cpuinfo_segv_addr(pc)) {
+ // Verify that OS save/restore AVX registers.
+ return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
+ }
+
+ 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 (thread->stack_guards_enabled()) {
+ if (in_java) {
+ frame fr;
+ PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
+ address addr = (address) exceptionRecord->ExceptionInformation[1];
+ if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
+ assert(fr.is_java_frame(), "Must be a Java frame");
+ SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
+ }
+ }
+ // 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.
+ assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
+ thread->disable_stack_yellow_reserved_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 (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_end();
+ 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_reserved_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,
+ !ExecMem);
+ return EXCEPTION_CONTINUE_EXECUTION;
+ } else
+#endif
+ {
+ // Null pointer exception.
+ if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) {
+ address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
+ if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
+ }
+ report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+ exceptionInfo->ContextRecord);
+ return EXCEPTION_CONTINUE_SEARCH;
+ }
+ }
+ }
+
+#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
+
+ // Stack overflow or null pointer exception in native code.
+ report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+ exceptionInfo->ContextRecord);
+ return EXCEPTION_CONTINUE_SEARCH;
+ } // /EXCEPTION_ACCESS_VIOLATION
+ // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+ 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
+ }
+ if (((thread->thread_state() == _thread_in_Java) ||
+ (thread->thread_state() == _thread_in_native)) &&
+ exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
+ LONG result=Handle_FLT_Exception(exceptionInfo);
+ if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
+ }
+ }
+
+ if (exception_code != EXCEPTION_BREAKPOINT) {
+ report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
+ exceptionInfo->ContextRecord);
+ }
+ 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
+
+static HANDLE _hProcess;
+static HANDLE _hToken;
+
+// Container for NUMA node list info
+class NUMANodeListHolder {
+ private:
+ int *_numa_used_node_list; // allocated below
+ int _numa_used_node_count;
+
+ void free_node_list() {
+ if (_numa_used_node_list != NULL) {
+ FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
+ }
+ }
+
+ public:
+ NUMANodeListHolder() {
+ _numa_used_node_count = 0;
+ _numa_used_node_list = NULL;
+ // do rest of initialization in build routine (after function pointers are set up)
+ }
+
+ ~NUMANodeListHolder() {
+ free_node_list();
+ }
+
+ bool build() {
+ DWORD_PTR proc_aff_mask;
+ DWORD_PTR sys_aff_mask;
+ if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
+ ULONG highest_node_number;
+ if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
+ free_node_list();
+ _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
+ for (unsigned int i = 0; i <= highest_node_number; i++) {
+ ULONGLONG proc_mask_numa_node;
+ if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
+ if ((proc_aff_mask & proc_mask_numa_node)!=0) {
+ _numa_used_node_list[_numa_used_node_count++] = i;
+ }
+ }
+ return (_numa_used_node_count > 1);
+ }
+
+ int get_count() { return _numa_used_node_count; }
+ int get_node_list_entry(int n) {
+ // for indexes out of range, returns -1
+ return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
+ }
+
+} numa_node_list_holder;
+
+
+
+static size_t _large_page_size = 0;
+
+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() {
+ if (_hProcess) CloseHandle(_hProcess);
+ _hProcess = NULL;
+ if (_hToken) CloseHandle(_hToken);
+ _hToken = NULL;
+}
+
+static bool numa_interleaving_init() {
+ bool success = false;
+ bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
+
+ // print a warning if UseNUMAInterleaving flag is specified on command line
+ bool warn_on_failure = use_numa_interleaving_specified;
+#define WARN(msg) if (warn_on_failure) { warning(msg); }
+
+ // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
+ size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
+ NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
+
+ if (numa_node_list_holder.build()) {
+ if (log_is_enabled(Debug, os, cpu)) {
+ Log(os, cpu) log;
+ log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
+ for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
+ log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
+ }
+ }
+ success = true;
+ } else {
+ WARN("Process does not cover multiple NUMA nodes.");
+ }
+ if (!success) {
+ if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
+ }
+ return success;
+#undef WARN
+}
+
+// this routine is used whenever we need to reserve a contiguous VA range
+// but we need to make separate VirtualAlloc calls for each piece of the range
+// Reasons for doing this:
+// * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
+// * UseNUMAInterleaving requires a separate node for each piece
+static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
+ DWORD prot,
+ bool should_inject_error = false) {
+ char * p_buf;
+ // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
+ size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
+ size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
+
+ // first reserve enough address space in advance since we want to be
+ // able to break a single contiguous virtual address range into multiple
+ // large page commits but WS2003 does not allow reserving large page space
+ // so we just use 4K pages for reserve, this gives us a legal contiguous
+ // address space. then we will deallocate that reservation, and re alloc
+ // using large pages
+ const size_t size_of_reserve = bytes + chunk_size;
+ if (bytes > size_of_reserve) {
+ // Overflowed.
+ return NULL;
+ }
+ p_buf = (char *) VirtualAlloc(addr,
+ size_of_reserve, // size of Reserve
+ MEM_RESERVE,
+ PAGE_READWRITE);
+ // If reservation failed, return NULL
+ if (p_buf == NULL) return NULL;
+ MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
+ os::release_memory(p_buf, bytes + chunk_size);
+
+ // we still need to round up to a page boundary (in case we are using large pages)
+ // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
+ // instead we handle this in the bytes_to_rq computation below
+ p_buf = align_up(p_buf, page_size);
+
+ // now go through and allocate one chunk at a time until all bytes are
+ // allocated
+ size_t bytes_remaining = bytes;
+ // An overflow of align_up() would have been caught above
+ // in the calculation of size_of_reserve.
+ char * next_alloc_addr = p_buf;
+ HANDLE hProc = GetCurrentProcess();
+
+#ifdef ASSERT
+ // Variable for the failure injection
+ int ran_num = os::random();
+ size_t fail_after = ran_num % bytes;
+#endif
+
+ int count=0;
+ while (bytes_remaining) {
+ // select bytes_to_rq to get to the next chunk_size boundary
+
+ size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
+ // Note allocate and commit
+ char * p_new;
+
+#ifdef ASSERT
+ bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
+#else
+ const bool inject_error_now = false;
+#endif
+
+ if (inject_error_now) {
+ p_new = NULL;
+ } else {
+ if (!UseNUMAInterleaving) {
+ p_new = (char *) VirtualAlloc(next_alloc_addr,
+ bytes_to_rq,
+ flags,
+ prot);
+ } else {
+ // get the next node to use from the used_node_list
+ assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
+ DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
+ p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
+ }
+ }
+
+ if (p_new == NULL) {
+ // Free any allocated pages
+ if (next_alloc_addr > p_buf) {
+ // Some memory was committed so release it.
+ size_t bytes_to_release = bytes - bytes_remaining;
+ // NMT has yet to record any individual blocks, so it
+ // need to create a dummy 'reserve' record to match
+ // the release.
+ MemTracker::record_virtual_memory_reserve((address)p_buf,
+ bytes_to_release, CALLER_PC);
+ os::release_memory(p_buf, bytes_to_release);
+ }
+#ifdef ASSERT
+ if (should_inject_error) {
+ log_develop_debug(pagesize)("Reserving pages individually failed.");
+ }
+#endif
+ return NULL;
+ }
+
+ bytes_remaining -= bytes_to_rq;
+ next_alloc_addr += bytes_to_rq;
+ count++;
+ }
+ // Although the memory is allocated individually, it is returned as one.
+ // NMT records it as one block.
+ if ((flags & MEM_COMMIT) != 0) {
+ MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
+ } else {
+ MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
+ }
+
+ // made it this far, success
+ return p_buf;
+}
+
+
+
+void os::large_page_init() {
+ if (!UseLargePages) return;
+
+ // 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 (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.");
+ }
+#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();
+ UseLargePages = 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::pd_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);
+ }
+ }
+}
+
+// Multiple threads can race in this code but it's not possible to unmap small sections of
+// virtual space to get requested alignment, like posix-like os's.
+// Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
+char* os::reserve_memory_aligned(size_t size, size_t alignment) {
+ assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
+ "Alignment must be a multiple of allocation granularity (page size)");
+ assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
+
+ size_t extra_size = size + alignment;
+ assert(extra_size >= size, "overflow, size is too large to allow alignment");
+
+ char* aligned_base = NULL;
+
+ do {
+ char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
+ if (extra_base == NULL) {
+ return NULL;
+ }
+ // Do manual alignment
+ aligned_base = align_up(extra_base, alignment);
+
+ os::release_memory(extra_base, extra_size);
+
+ aligned_base = os::reserve_memory(size, aligned_base);
+
+ } while (aligned_base == NULL);
+
+ return aligned_base;
+}
+
+char* os::pd_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_page_size() == 0, "reserve page size");
+ char* res;
+ // note that if UseLargePages is on, all the areas that require interleaving
+ // will go thru reserve_memory_special rather than thru here.
+ bool use_individual = (UseNUMAInterleaving && !UseLargePages);
+ if (!use_individual) {
+ res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
+ } else {
+ elapsedTimer reserveTimer;
+ if (Verbose && PrintMiscellaneous) reserveTimer.start();
+ // in numa interleaving, we have to allocate pages individually
+ // (well really chunks of NUMAInterleaveGranularity size)
+ res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
+ if (res == NULL) {
+ warning("NUMA page allocation failed");
+ }
+ if (Verbose && PrintMiscellaneous) {
+ reserveTimer.stop();
+ tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
+ reserveTimer.milliseconds(), reserveTimer.ticks());
+ }
+ }
+ 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::pd_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;
+}
+
+bool os::can_execute_large_page_memory() {
+ return true;
+}
+
+char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
+ bool exec) {
+ assert(UseLargePages, "only for large pages");
+
+ if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
+ return NULL; // Fallback to small pages.
+ }
+
+ const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
+ const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
+
+ // with large pages, there are two cases where we need to use Individual Allocation
+ // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
+ // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
+ if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
+ log_debug(pagesize)("Reserving large pages individually.");
+
+ char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
+ if (p_buf == NULL) {
+ // give an appropriate warning message
+ if (UseNUMAInterleaving) {
+ warning("NUMA large page allocation failed, UseLargePages flag ignored");
+ }
+ if (UseLargePagesIndividualAllocation) {
+ warning("Individually allocated large pages failed, "
+ "use -XX:-UseLargePagesIndividualAllocation to turn off");
+ }
+ return NULL;
+ }
+
+ return p_buf;
+
+ } else {
+ log_debug(pagesize)("Reserving large pages in a single large chunk.");
+
+ // normal policy just allocate it all at once
+ DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
+ char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
+ if (res != NULL) {
+ MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
+ }
+
+ return res;
+ }
+}
+
+bool os::release_memory_special(char* base, size_t bytes) {
+ assert(base != NULL, "Sanity check");
+ return release_memory(base, bytes);
+}
+
+void os::print_statistics() {
+}
+
+static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
+ int err = os::get_last_error();
+ char buf[256];
+ size_t buf_len = os::lasterror(buf, sizeof(buf));
+ warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
+ ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
+ exec, buf_len != 0 ? buf : "<no_error_string>", err);
+}
+
+bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
+ 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.
+
+ // unless we have NUMAInterleaving enabled, the range of a commit
+ // is always within a reserve covered by a single VirtualAlloc
+ // in that case we can just do a single commit for the requested size
+ if (!UseNUMAInterleaving) {
+ if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
+ NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
+ return false;
+ }
+ if (exec) {
+ DWORD oldprot;
+ // Windows doc says to use VirtualProtect to get execute permissions
+ if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
+ NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
+ return false;
+ }
+ }
+ return true;
+ } else {
+
+ // when NUMAInterleaving is enabled, the commit might cover a range that
+ // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
+ // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
+ // returns represents the number of bytes that can be committed in one step.
+ size_t bytes_remaining = bytes;
+ char * next_alloc_addr = addr;
+ while (bytes_remaining > 0) {
+ MEMORY_BASIC_INFORMATION alloc_info;
+ VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
+ size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
+ if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
+ PAGE_READWRITE) == NULL) {
+ NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
+ exec);)
+ return false;
+ }
+ if (exec) {
+ DWORD oldprot;
+ if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
+ PAGE_EXECUTE_READWRITE, &oldprot)) {
+ NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
+ exec);)
+ return false;
+ }
+ }
+ bytes_remaining -= bytes_to_rq;
+ next_alloc_addr += bytes_to_rq;
+ }
+ }
+ // if we made it this far, return true
+ return true;
+}
+
+bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
+ bool exec) {
+ // alignment_hint is ignored on this OS
+ return pd_commit_memory(addr, size, exec);
+}
+
+void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
+ const char* mesg) {
+ assert(mesg != NULL, "mesg must be specified");
+ if (!pd_commit_memory(addr, size, exec)) {
+ warn_fail_commit_memory(addr, size, exec);
+ vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
+ }
+}
+
+void os::pd_commit_memory_or_exit(char* addr, size_t size,
+ size_t alignment_hint, bool exec,
+ const char* mesg) {
+ // alignment_hint is ignored on this OS
+ pd_commit_memory_or_exit(addr, size, exec, mesg);
+}
+
+bool os::pd_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::pd_release_memory(char* addr, size_t bytes) {
+ return VirtualFree(addr, 0, MEM_RELEASE) != 0;
+}
+
+bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
+ return os::commit_memory(addr, size, !ExecMem);
+}
+
+bool os::remove_stack_guard_pages(char* addr, size_t size) {
+ return os::uncommit_memory(addr, size);
+}
+
+static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
+ uint count = 0;
+ bool ret = false;
+ size_t bytes_remaining = bytes;
+ char * next_protect_addr = addr;
+
+ // Use VirtualQuery() to get the chunk size.
+ while (bytes_remaining) {
+ MEMORY_BASIC_INFORMATION alloc_info;
+ if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
+ return false;
+ }
+
+ size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
+ // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
+ // but we don't distinguish here as both cases are protected by same API.
+ ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
+ warning("Failed protecting pages individually for chunk #%u", count);
+ if (!ret) {
+ return false;
+ }
+
+ bytes_remaining -= bytes_to_protect;
+ next_protect_addr += bytes_to_protect;
+ count++;
+ }
+ return ret;
+}
+
+// Set protections specified
+bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
+ bool is_committed) {
+ unsigned int p = 0;
+ switch (prot) {
+ case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
+ case MEM_PROT_READ: p = PAGE_READONLY; break;
+ case MEM_PROT_RW: p = PAGE_READWRITE; break;
+ case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
+ default:
+ ShouldNotReachHere();
+ }
+
+ DWORD old_status;
+
+ // Strange enough, but on Win32 one can change protection only for committed
+ // memory, not a big deal anyway, as bytes less or equal than 64K
+ if (!is_committed) {
+ commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
+ "cannot commit protection page");
+ }
+ // One cannot use os::guard_memory() here, as on Win32 guard page
+ // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
+ //
+ // Pages in the region become guard pages. Any attempt to access a guard page
+ // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
+ // the guard page status. Guard pages thus act as a one-time access alarm.
+ bool ret;
+ if (UseNUMAInterleaving) {
+ // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
+ // so we must protect the chunks individually.
+ ret = protect_pages_individually(addr, bytes, p, &old_status);
+ } else {
+ ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
+ }
+#ifdef ASSERT
+ if (!ret) {
+ int err = os::get_last_error();
+ char buf[256];
+ size_t buf_len = os::lasterror(buf, sizeof(buf));
+ warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
+ ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
+ buf_len != 0 ? buf : "<no_error_string>", err);
+ }
+#endif
+ return ret;
+}
+
+bool os::guard_memory(char* addr, size_t bytes) {
+ DWORD old_status;
+ return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
+}
+
+bool os::unguard_memory(char* addr, size_t bytes) {
+ DWORD old_status;
+ return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
+}
+
+void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
+void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
+void os::numa_make_global(char *addr, size_t bytes) { }
+void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
+bool os::numa_topology_changed() { return false; }
+size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
+int os::numa_get_group_id() { return 0; }
+size_t os::numa_get_leaf_groups(int *ids, size_t size) {
+ if (numa_node_list_holder.get_count() == 0 && size > 0) {
+ // Provide an answer for UMA systems
+ ids[0] = 0;
+ return 1;
+ } else {
+ // check for size bigger than actual groups_num
+ size = MIN2(size, numa_get_groups_num());
+ for (int i = 0; i < (int)size; i++) {
+ ids[i] = numa_node_list_holder.get_node_list_entry(i);
+ }
+ return size;
+ }
+}
+
+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
+}
+
+class HighResolutionInterval : public CHeapObj<mtThread> {
+ // 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;
+}
+
+// Short sleep, direct OS call.
+//
+// ms = 0, means allow others (if any) to run.
+//
+void os::naked_short_sleep(jlong ms) {
+ assert(ms < 1000, "Un-interruptable sleep, short time use only");
+ Sleep(ms);
+}
+
+// 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);
+
+void os::naked_yield() {
+ // Consider passing back the return value from SwitchToThread().
+ SwitchToThread();
+}
+
+// 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[CriticalPriority + 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
+ THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
+};
+
+int prio_policy1[CriticalPriority + 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
+ THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
+};
+
+static int prio_init() {
+ // If ThreadPriorityPolicy is 1, switch tables
+ if (ThreadPriorityPolicy == 1) {
+ int i;
+ for (i = 0; i < CriticalPriority + 1; i++) {
+ os::java_to_os_priority[i] = prio_policy1[i];
+ }
+ }
+ if (UseCriticalJavaThreadPriority) {
+ os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
+ }
+ 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();
+ // There is no synchronization between the setting of the interrupt
+ // and it being cleared here. It is critical - see 6535709 - that
+ // we only clear the interrupt state, and reset the interrupt event,
+ // if we are going to report that we were indeed interrupted - else
+ // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
+ // depending on the timing. By checking thread interrupt event to see
+ // if the thread gets real interrupt thus prevent spurious wakeup.
+ bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
+ if (interrupted && clear_interrupted) {
+ osthread->set_interrupted(false);
+ ResetEvent(osthread->interrupt_event());
+ } // Otherwise leave the interrupted state alone
+
+ return interrupted;
+}
+
+// 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_windows_server = false;
+
+// 6573254
+// Currently, the bug is observed across all the supported Windows releases,
+// including the latest one (as of this writing - Windows Server 2012 R2)
+bool os::win32::_has_exit_bug = true;
+
+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;
+ set_processor_count(si.dwNumberOfProcessors);
+
+ MEMORYSTATUSEX ms;
+ ms.dwLength = sizeof(ms);
+
+ // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
+ // dwMemoryLoad (% of memory in use)
+ GlobalMemoryStatusEx(&ms);
+ _physical_memory = ms.ullTotalPhys;
+
+ if (FLAG_IS_DEFAULT(MaxRAM)) {
+ // Adjust MaxRAM according to the maximum virtual address space available.
+ FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
+ }
+
+ OSVERSIONINFOEX oi;
+ oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
+ GetVersionEx((OSVERSIONINFO*)&oi);
+ switch (oi.dwPlatformId) {
+ case VER_PLATFORM_WIN32_NT:
+ {
+ int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
+ if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
+ oi.wProductType == VER_NT_SERVER) {
+ _is_windows_server = 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();
+}
+
+
+HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
+ int ebuflen) {
+ char path[MAX_PATH];
+ DWORD size;
+ DWORD pathLen = (DWORD)sizeof(path);
+ HINSTANCE result = NULL;
+
+ // only allow library name without path component
+ assert(strchr(name, '\\') == NULL, "path not allowed");
+ assert(strchr(name, ':') == NULL, "path not allowed");
+ if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
+ jio_snprintf(ebuf, ebuflen,
+ "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
+ return NULL;
+ }
+
+ // search system directory
+ if ((size = GetSystemDirectory(path, pathLen)) > 0) {
+ if (size >= pathLen) {
+ return NULL; // truncated
+ }
+ if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
+ return NULL; // truncated
+ }
+ if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
+ return result;
+ }
+ }
+
+ // try Windows directory
+ if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
+ if (size >= pathLen) {
+ return NULL; // truncated
+ }
+ if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
+ return NULL; // truncated
+ }
+ if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
+ return result;
+ }
+ }
+
+ jio_snprintf(ebuf, ebuflen,
+ "os::win32::load_windows_dll() cannot load %s from system directories.", name);
+ return NULL;
+}
+
+#define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
+#define EXIT_TIMEOUT 300000 /* 5 minutes */
+
+static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
+ InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
+ return TRUE;
+}
+
+int os::win32::exit_process_or_thread(Ept what, int exit_code) {
+ // Basic approach:
+ // - Each exiting thread registers its intent to exit and then does so.
+ // - A thread trying to terminate the process must wait for all
+ // threads currently exiting to complete their exit.
+
+ if (os::win32::has_exit_bug()) {
+ // The array holds handles of the threads that have started exiting by calling
+ // _endthreadex().
+ // Should be large enough to avoid blocking the exiting thread due to lack of
+ // a free slot.
+ static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
+ static int handle_count = 0;
+
+ static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
+ static CRITICAL_SECTION crit_sect;
+ static volatile jint process_exiting = 0;
+ int i, j;
+ DWORD res;
+ HANDLE hproc, hthr;
+
+ // We only attempt to register threads until a process exiting
+ // thread manages to set the process_exiting flag. Any threads
+ // that come through here after the process_exiting flag is set
+ // are unregistered and will be caught in the SuspendThread()
+ // infinite loop below.
+ bool registered = false;
+
+ // The first thread that reached this point, initializes the critical section.
+ if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
+ warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
+ } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
+ if (what != EPT_THREAD) {
+ // Atomically set process_exiting before the critical section
+ // to increase the visibility between racing threads.
+ Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0);
+ }
+ EnterCriticalSection(&crit_sect);
+
+ if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
+ // Remove from the array those handles of the threads that have completed exiting.
+ for (i = 0, j = 0; i < handle_count; ++i) {
+ res = WaitForSingleObject(handles[i], 0 /* don't wait */);
+ if (res == WAIT_TIMEOUT) {
+ handles[j++] = handles[i];
+ } else {
+ if (res == WAIT_FAILED) {
+ warning("WaitForSingleObject failed (%u) in %s: %d\n",
+ GetLastError(), __FILE__, __LINE__);
+ }
+ // Don't keep the handle, if we failed waiting for it.
+ CloseHandle(handles[i]);
+ }
+ }
+
+ // If there's no free slot in the array of the kept handles, we'll have to
+ // wait until at least one thread completes exiting.
+ if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
+ // Raise the priority of the oldest exiting thread to increase its chances
+ // to complete sooner.
+ SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
+ res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
+ if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
+ i = (res - WAIT_OBJECT_0);
+ handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
+ for (; i < handle_count; ++i) {
+ handles[i] = handles[i + 1];
+ }
+ } else {
+ warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
+ (res == WAIT_FAILED ? "failed" : "timed out"),
+ GetLastError(), __FILE__, __LINE__);
+ // Don't keep handles, if we failed waiting for them.
+ for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
+ CloseHandle(handles[i]);
+ }
+ handle_count = 0;
+ }
+ }
+
+ // Store a duplicate of the current thread handle in the array of handles.
+ hproc = GetCurrentProcess();
+ hthr = GetCurrentThread();
+ if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
+ 0, FALSE, DUPLICATE_SAME_ACCESS)) {
+ warning("DuplicateHandle failed (%u) in %s: %d\n",
+ GetLastError(), __FILE__, __LINE__);
+
+ // We can't register this thread (no more handles) so this thread
+ // may be racing with a thread that is calling exit(). If the thread
+ // that is calling exit() has managed to set the process_exiting
+ // flag, then this thread will be caught in the SuspendThread()
+ // infinite loop below which closes that race. A small timing
+ // window remains before the process_exiting flag is set, but it
+ // is only exposed when we are out of handles.
+ } else {
+ ++handle_count;
+ registered = true;
+
+ // The current exiting thread has stored its handle in the array, and now
+ // should leave the critical section before calling _endthreadex().
+ }
+
+ } else if (what != EPT_THREAD && handle_count > 0) {
+ jlong start_time, finish_time, timeout_left;
+ // Before ending the process, make sure all the threads that had called
+ // _endthreadex() completed.
+
+ // Set the priority level of the current thread to the same value as
+ // the priority level of exiting threads.
+ // This is to ensure it will be given a fair chance to execute if
+ // the timeout expires.
+ hthr = GetCurrentThread();
+ SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
+ start_time = os::javaTimeNanos();
+ finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
+ for (i = 0; ; ) {
+ int portion_count = handle_count - i;
+ if (portion_count > MAXIMUM_WAIT_OBJECTS) {
+ portion_count = MAXIMUM_WAIT_OBJECTS;
+ }
+ for (j = 0; j < portion_count; ++j) {
+ SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
+ }
+ timeout_left = (finish_time - start_time) / 1000000L;
+ if (timeout_left < 0) {
+ timeout_left = 0;
+ }
+ res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
+ if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
+ warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
+ (res == WAIT_FAILED ? "failed" : "timed out"),
+ GetLastError(), __FILE__, __LINE__);
+ // Reset portion_count so we close the remaining
+ // handles due to this error.
+ portion_count = handle_count - i;
+ }
+ for (j = 0; j < portion_count; ++j) {
+ CloseHandle(handles[i + j]);
+ }
+ if ((i += portion_count) >= handle_count) {
+ break;
+ }
+ start_time = os::javaTimeNanos();
+ }
+ handle_count = 0;
+ }
+
+ LeaveCriticalSection(&crit_sect);
+ }
+
+ if (!registered &&
+ OrderAccess::load_acquire(&process_exiting) != 0 &&
+ process_exiting != (jint)GetCurrentThreadId()) {
+ // Some other thread is about to call exit(), so we don't let
+ // the current unregistered thread proceed to exit() or _endthreadex()
+ while (true) {
+ SuspendThread(GetCurrentThread());
+ // Avoid busy-wait loop, if SuspendThread() failed.
+ Sleep(EXIT_TIMEOUT);
+ }
+ }
+ }
+
+ // We are here if either
+ // - there's no 'race at exit' bug on this OS release;
+ // - initialization of the critical section failed (unlikely);
+ // - the current thread has registered itself and left the critical section;
+ // - the process-exiting thread has raised the flag and left the critical section.
+ if (what == EPT_THREAD) {
+ _endthreadex((unsigned)exit_code);
+ } else if (what == EPT_PROCESS) {
+ ::exit(exit_code);
+ } else {
+ _exit(exit_code);
+ }
+
+ // Should not reach here
+ return exit_code;
+}
+
+#undef EXIT_TIMEOUT
+
+void os::win32::setmode_streams() {
+ _setmode(_fileno(stdin), _O_BINARY);
+ _setmode(_fileno(stdout), _O_BINARY);
+ _setmode(_fileno(stderr), _O_BINARY);
+}
+
+
+bool os::is_debugger_attached() {
+ return IsDebuggerPresent() ? true : false;
+}
+
+
+void os::wait_for_keypress_at_exit(void) {
+ if (PauseAtExit) {
+ fprintf(stderr, "Press any key to continue...\n");
+ fgetc(stdin);
+ }
+}
+
+
+bool 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;
+}
+
+#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());
+
+ // This may be overridden later when argument processing is done.
+ FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
+
+ // 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();
+
+ // initialize fast thread access - only used for 32-bit
+ win32::initialize_thread_ptr_offset();
+}
+
+// To install functions for atexit processing
+extern "C" {
+ static void perfMemory_exit_helper() {
+ perfMemory_exit();
+ }
+}
+
+static jint initSock();
+
+// 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);
+ log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
+
+ if (!UseMembar) {
+ address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_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_READWRITE);
+ guarantee(return_page != NULL, "Commit Failed for memory serialize page");
+
+ os::set_memory_serialize_page(mem_serialize_page);
+ log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
+ }
+
+ // Setup Windows Exceptions
+
+ // 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
+ }
+
+ // 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 = align_up(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;
+ }
+
+ // Check minimum allowable stack size for thread creation and to initialize
+ // the java system classes, including StackOverflowError - depends on page
+ // size. Add two 4K pages for compiler2 recursion in main thread.
+ // Add in 4*BytesPerWord 4K pages to account for VM stack during
+ // class initialization depending on 32 or 64 bit VM.
+ size_t min_stack_allowed =
+ (size_t)(JavaThread::stack_guard_zone_size() +
+ JavaThread::stack_shadow_zone_size() +
+ (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
+
+ min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
+
+ if (actual_reserve_size < min_stack_allowed) {
+ tty->print_cr("\nThe Java thread stack size specified is too small. "
+ "Specify at least %dk",
+ min_stack_allowed / K);
+ return JNI_ERR;
+ }
+
+ 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 << (BitsPerWord - 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");
+ }
+ }
+
+#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();
+
+ if (UseNUMA && !ForceNUMA) {
+ UseNUMA = false; // We don't fully support this yet
+ }
+
+ if (UseNUMAInterleaving) {
+ // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
+ bool success = numa_interleaving_init();
+ if (!success) UseNUMAInterleaving = false;
+ }
+
+ if (initSock() != JNI_OK) {
+ return JNI_ERR;
+ }
+
+ 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;
+ }
+ os::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
+ 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;
+ }
+}
+
+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
+ FILETIME CreationTime;
+ FILETIME ExitTime;
+ FILETIME KernelTime;
+ FILETIME UserTime;
+
+ if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
+ &KernelTime, &UserTime) == 0) {
+ return false;
+ } else {
+ return true;
+ }
+}
+
+// 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;
+}
+
+// This method is a slightly reworked copy of JDK's sysOpen
+// from src/windows/hpi/src/sys_api_md.c
+
+int os::open(const char *path, int oflag, int mode) {
+ char pathbuf[MAX_PATH];
+
+ if (strlen(path) > MAX_PATH - 1) {
+ errno = ENAMETOOLONG;
+ return -1;
+ }
+ os::native_path(strcpy(pathbuf, path));
+ return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
+}
+
+FILE* os::open(int fd, const char* mode) {
+ return ::_fdopen(fd, mode);
+}
+
+// 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);
+}
+
+
+jlong os::lseek(int fd, jlong offset, int whence) {
+ return (jlong) ::_lseeki64(fd, offset, whence);
+}
+
+size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
+ OVERLAPPED ov;
+ DWORD nread;
+ BOOL result;
+
+ ZeroMemory(&ov, sizeof(ov));
+ ov.Offset = (DWORD)offset;
+ ov.OffsetHigh = (DWORD)(offset >> 32);
+
+ HANDLE h = (HANDLE)::_get_osfhandle(fd);
+
+ result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
+
+ return result ? nread : 0;
+}
+
+
+// This method is a slightly reworked copy of JDK's sysNativePath
+// from src/windows/hpi/src/path_md.c
+
+// Convert a pathname to native format. On win32, this involves forcing all
+// separators to be '\\' rather than '/' (both are legal inputs, but Win95
+// sometimes rejects '/') and removing redundant separators. The input path is
+// assumed to have been converted into the character encoding used by the local
+// system. Because this might be a double-byte encoding, care is taken to
+// treat double-byte lead characters correctly.
+//
+// This procedure modifies the given path in place, as the result is never
+// longer than the original. There is no error return; this operation always
+// succeeds.
+char * os::native_path(char *path) {
+ char *src = path, *dst = path, *end = path;
+ char *colon = NULL; // If a drive specifier is found, this will
+ // point to the colon following the drive letter
+
+ // Assumption: '/', '\\', ':', and drive letters are never lead bytes
+ assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
+ && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
+
+ // Check for leading separators
+#define isfilesep(c) ((c) == '/' || (c) == '\\')
+ while (isfilesep(*src)) {
+ src++;
+ }
+
+ if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
+ // Remove leading separators if followed by drive specifier. This
+ // hack is necessary to support file URLs containing drive
+ // specifiers (e.g., "file://c:/path"). As a side effect,
+ // "/c:/path" can be used as an alternative to "c:/path".
+ *dst++ = *src++;
+ colon = dst;
+ *dst++ = ':';
+ src++;
+ } else {
+ src = path;
+ if (isfilesep(src[0]) && isfilesep(src[1])) {
+ // UNC pathname: Retain first separator; leave src pointed at
+ // second separator so that further separators will be collapsed
+ // into the second separator. The result will be a pathname
+ // beginning with "\\\\" followed (most likely) by a host name.
+ src = dst = path + 1;
+ path[0] = '\\'; // Force first separator to '\\'
+ }
+ }
+
+ end = dst;
+
+ // Remove redundant separators from remainder of path, forcing all
+ // separators to be '\\' rather than '/'. Also, single byte space
+ // characters are removed from the end of the path because those
+ // are not legal ending characters on this operating system.
+ //
+ while (*src != '\0') {
+ if (isfilesep(*src)) {
+ *dst++ = '\\'; src++;
+ while (isfilesep(*src)) src++;
+ if (*src == '\0') {
+ // Check for trailing separator
+ end = dst;
+ if (colon == dst - 2) break; // "z:\\"
+ if (dst == path + 1) break; // "\\"
+ if (dst == path + 2 && isfilesep(path[0])) {
+ // "\\\\" is not collapsed to "\\" because "\\\\" marks the
+ // beginning of a UNC pathname. Even though it is not, by
+ // itself, a valid UNC pathname, we leave it as is in order
+ // to be consistent with the path canonicalizer as well
+ // as the win32 APIs, which treat this case as an invalid
+ // UNC pathname rather than as an alias for the root
+ // directory of the current drive.
+ break;
+ }
+ end = --dst; // Path does not denote a root directory, so
+ // remove trailing separator
+ break;
+ }
+ end = dst;
+ } else {
+ if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
+ *dst++ = *src++;
+ if (*src) *dst++ = *src++;
+ end = dst;
+ } else { // Copy a single-byte character
+ char c = *src++;
+ *dst++ = c;
+ // Space is not a legal ending character
+ if (c != ' ') end = dst;
+ }
+ }
+ }
+
+ *end = '\0';
+
+ // For "z:", add "." to work around a bug in the C runtime library
+ if (colon == dst - 1) {
+ path[2] = '.';
+ path[3] = '\0';
+ }
+
+ return path;
+}
+
+// This code is a copy of JDK's sysSetLength
+// from src/windows/hpi/src/sys_api_md.c
+
+int os::ftruncate(int fd, jlong length) {
+ HANDLE h = (HANDLE)::_get_osfhandle(fd);
+ long high = (long)(length >> 32);
+ DWORD ret;
+
+ if (h == (HANDLE)(-1)) {
+ return -1;
+ }
+
+ ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
+ if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
+ return -1;
+ }
+
+ if (::SetEndOfFile(h) == FALSE) {
+ return -1;
+ }
+
+ return 0;
+}
+
+int os::get_fileno(FILE* fp) {
+ return _fileno(fp);
+}
+
+// This code is a copy of JDK's sysSync
+// from src/windows/hpi/src/sys_api_md.c
+// except for the legacy workaround for a bug in Win 98
+
+int os::fsync(int fd) {
+ HANDLE handle = (HANDLE)::_get_osfhandle(fd);
+
+ if ((!::FlushFileBuffers(handle)) &&
+ (GetLastError() != ERROR_ACCESS_DENIED)) {
+ // from winerror.h
+ return -1;
+ }
+ return 0;
+}
+
+static int nonSeekAvailable(int, long *);
+static int stdinAvailable(int, long *);
+
+#define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
+#define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
+
+// This code is a copy of JDK's sysAvailable
+// from src/windows/hpi/src/sys_api_md.c
+
+int os::available(int fd, jlong *bytes) {
+ jlong cur, end;
+ struct _stati64 stbuf64;
+
+ if (::_fstati64(fd, &stbuf64) >= 0) {
+ int mode = stbuf64.st_mode;
+ if (S_ISCHR(mode) || S_ISFIFO(mode)) {
+ int ret;
+ long lpbytes;
+ if (fd == 0) {
+ ret = stdinAvailable(fd, &lpbytes);
+ } else {
+ ret = nonSeekAvailable(fd, &lpbytes);
+ }
+ (*bytes) = (jlong)(lpbytes);
+ return ret;
+ }
+ if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
+ return FALSE;
+ } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
+ return FALSE;
+ } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
+ return FALSE;
+ }
+ *bytes = end - cur;
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+void os::flockfile(FILE* fp) {
+ _lock_file(fp);
+}
+
+void os::funlockfile(FILE* fp) {
+ _unlock_file(fp);
+}
+
+// This code is a copy of JDK's nonSeekAvailable
+// from src/windows/hpi/src/sys_api_md.c
+
+static int nonSeekAvailable(int fd, long *pbytes) {
+ // This is used for available on non-seekable devices
+ // (like both named and anonymous pipes, such as pipes
+ // connected to an exec'd process).
+ // Standard Input is a special case.
+ HANDLE han;
+
+ if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
+ return FALSE;
+ }
+
+ if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
+ // PeekNamedPipe fails when at EOF. In that case we
+ // simply make *pbytes = 0 which is consistent with the
+ // behavior we get on Solaris when an fd is at EOF.
+ // The only alternative is to raise an Exception,
+ // which isn't really warranted.
+ //
+ if (::GetLastError() != ERROR_BROKEN_PIPE) {
+ return FALSE;
+ }
+ *pbytes = 0;
+ }
+ return TRUE;
+}
+
+#define MAX_INPUT_EVENTS 2000
+
+// This code is a copy of JDK's stdinAvailable
+// from src/windows/hpi/src/sys_api_md.c
+
+static int stdinAvailable(int fd, long *pbytes) {
+ HANDLE han;
+ DWORD numEventsRead = 0; // Number of events read from buffer
+ DWORD numEvents = 0; // Number of events in buffer
+ DWORD i = 0; // Loop index
+ DWORD curLength = 0; // Position marker
+ DWORD actualLength = 0; // Number of bytes readable
+ BOOL error = FALSE; // Error holder
+ INPUT_RECORD *lpBuffer; // Pointer to records of input events
+
+ if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
+ return FALSE;
+ }
+
+ // Construct an array of input records in the console buffer
+ error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
+ if (error == 0) {
+ return nonSeekAvailable(fd, pbytes);
+ }
+
+ // lpBuffer must fit into 64K or else PeekConsoleInput fails
+ if (numEvents > MAX_INPUT_EVENTS) {
+ numEvents = MAX_INPUT_EVENTS;
+ }
+
+ lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
+ if (lpBuffer == NULL) {
+ return FALSE;
+ }
+
+ error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
+ if (error == 0) {
+ os::free(lpBuffer);
+ return FALSE;
+ }
+
+ // Examine input records for the number of bytes available
+ for (i=0; i<numEvents; i++) {
+ if (lpBuffer[i].EventType == KEY_EVENT) {
+
+ KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
+ &(lpBuffer[i].Event);
+ if (keyRecord->bKeyDown == TRUE) {
+ CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
+ curLength++;
+ if (*keyPressed == '\r') {
+ actualLength = curLength;
+ }
+ }
+ }
+ }
+
+ if (lpBuffer != NULL) {
+ os::free(lpBuffer);
+ }
+
+ *pbytes = (long) actualLength;
+ return TRUE;
+}
+
+// Map a block of memory.
+char* os::pd_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) {
+ log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
+ 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) {
+ log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
+ 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) {
+ log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
+ release_memory(base, bytes);
+ CloseHandle(hFile);
+ return NULL;
+ }
+ } else {
+ HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
+ NULL /* file_name */);
+ if (hMap == NULL) {
+ log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
+ 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) {
+ log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
+ CloseHandle(hMap);
+ CloseHandle(hFile);
+ return NULL;
+ }
+
+ if (CloseHandle(hMap) == 0) {
+ log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
+ 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) {
+ log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
+ // 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) {
+ log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
+ return base;
+ }
+
+ return base;
+}
+
+
+// Remap a block of memory.
+char* os::pd_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::pd_unmap_memory(char* addr, size_t bytes) {
+ MEMORY_BASIC_INFORMATION mem_info;
+ if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
+ log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
+ return false;
+ }
+
+ // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
+ // Instead, executable region was allocated using VirtualAlloc(). See
+ // pd_map_memory() above.
+ //
+ // The following flags should match the 'exec_access' flages used for
+ // VirtualProtect() in pd_map_memory().
+ if (mem_info.Protect == PAGE_EXECUTE_READ ||
+ mem_info.Protect == PAGE_EXECUTE_READWRITE) {
+ return pd_release_memory(addr, bytes);
+ }
+
+ BOOL result = UnmapViewOfFile(addr);
+ if (result == 0) {
+ log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
+ 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);
+ }
+}
+
+Thread* os::ThreadCrashProtection::_protected_thread = NULL;
+os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
+volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
+
+os::ThreadCrashProtection::ThreadCrashProtection() {
+}
+
+// See the caveats for this class in os_windows.hpp
+// Protects the callback call so that raised OS EXCEPTIONS causes a jump back
+// into this method and returns false. If no OS EXCEPTION was raised, returns
+// true.
+// The callback is supposed to provide the method that should be protected.
+//
+bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
+
+ Thread::muxAcquire(&_crash_mux, "CrashProtection");
+
+ _protected_thread = Thread::current_or_null();
+ assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
+
+ bool success = true;
+ __try {
+ _crash_protection = this;
+ cb.call();
+ } __except(EXCEPTION_EXECUTE_HANDLER) {
+ // only for protection, nothing to do
+ success = false;
+ }
+ _crash_protection = NULL;
+ _protected_thread = NULL;
+ Thread::muxRelease(&_crash_mux);
+ return success;
+}
+
+// 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.
+//
+// Assumption:
+// Only one parker can exist on an event, which is why we allocate
+// them per-thread. Multiple unparkers can coexist.
+//
+// _Event transitions in park()
+// -1 => -1 : illegal
+// 1 => 0 : pass - return immediately
+// 0 => -1 : block; then set _Event to 0 before returning
+//
+// _Event transitions in unpark()
+// 0 => 1 : just return
+// 1 => 1 : just return
+// -1 => either 0 or 1; must signal target thread
+// That is, we can safely transition _Event from -1 to either
+// 0 or 1.
+//
+// _Event serves as a restricted-range semaphore.
+// -1 : thread is blocked, i.e. there is a waiter
+// 0 : neutral: thread is running or ready,
+// could have been signaled after a wait started
+// 1 : signaled - thread is running or ready
+//
+// Another possible encoding of _Event would be with
+// explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
+//
+
+int os::PlatformEvent::park(jlong Millis) {
+ // Transitions for _Event:
+ // -1 => -1 : illegal
+ // 1 => 0 : pass - return immediately
+ // 0 => -1 : block; then set _Event to 0 before returning
+
+ guarantee(_ParkHandle != NULL , "Invariant");
+ guarantee(Millis > 0 , "Invariant");
+
+ // CONSIDER: defer assigning a CreateEvent() handle to the Event until
+ // the initial park() operation.
+ // Consider: use atomic decrement instead of CAS-loop
+
+ int v;
+ 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;
+ // see comment at end of os::PlatformEvent::park() below:
+ 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() {
+ // Transitions for _Event:
+ // -1 => -1 : illegal
+ // 1 => 0 : pass - return immediately
+ // 0 => -1 : block; then set _Event to 0 before returning
+
+ guarantee(_ParkHandle != NULL, "Invariant");
+ // Invariant: Only the thread associated with the Event/PlatformEvent
+ // may call park().
+ // Consider: use atomic decrement instead of CAS-loop
+ 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");
+
+ // Transitions for _Event:
+ // 0 => 1 : just return
+ // 1 => 1 : just return
+ // -1 => either 0 or 1; must signal target thread
+ // That is, we can safely transition _Event from -1 to either
+ // 0 or 1.
+ // See also: "Semaphores in Plan 9" by Mullender & Cox
+ //
+ // Note: Forcing a transition from "-1" to "1" on an unpark() means
+ // that it will take two back-to-back park() calls for the owning
+ // thread to block. This has the benefit of forcing a spurious return
+ // from the first park() call after an unpark() call which will help
+ // shake out uses of park() and unpark() without condition variables.
+
+ if (Atomic::xchg(1, &_Event) >= 0) return;
+
+ ::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 && !isAbsolute) {
+ 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::current();
+
+ // 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(thread);
+ OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
+ thread->set_suspend_equivalent();
+
+ WaitForSingleObject(_ParkEvent, time);
+ ResetEvent(_ParkEvent);
+
+ // If externally suspended while waiting, re-suspend
+ if (thread->handle_special_suspend_equivalent_condition()) {
+ thread->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;
+ DWORD exit_code;
+
+ char * cmd_string;
+ char * cmd_prefix = "cmd /C ";
+ size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
+ cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
+ if (cmd_string == NULL) {
+ return -1;
+ }
+ cmd_string[0] = '\0';
+ strcat(cmd_string, cmd_prefix);
+ strcat(cmd_string, cmd);
+
+ // now replace all '\n' with '&'
+ char * substring = cmd_string;
+ while ((substring = strchr(substring, '\n')) != NULL) {
+ substring[0] = '&';
+ substring++;
+ }
+ memset(&si, 0, sizeof(si));
+ si.cb = sizeof(si);
+ memset(&pi, 0, sizeof(pi));
+ BOOL rslt = CreateProcess(NULL, // executable name - use command line
+ cmd_string, // 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);
+
+ GetExitCodeProcess(pi.hProcess, &exit_code);
+
+ // Close process and thread handles.
+ CloseHandle(pi.hProcess);
+ CloseHandle(pi.hThread);
+ } else {
+ exit_code = -1;
+ }
+
+ FREE_C_HEAP_ARRAY(char, cmd_string);
+ return (int)exit_code;
+}
+
+bool os::find(address addr, outputStream* st) {
+ int offset = -1;
+ bool result = false;
+ char buf[256];
+ if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
+ st->print(PTR_FORMAT " ", addr);
+ if (strlen(buf) < sizeof(buf) - 1) {
+ char* p = strrchr(buf, '\\');
+ if (p) {
+ st->print("%s", p + 1);
+ } else {
+ st->print("%s", buf);
+ }
+ } else {
+ // The library name is probably truncated. Let's omit the library name.
+ // See also JDK-8147512.
+ }
+ if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
+ st->print("::%s + 0x%x", buf, offset);
+ }
+ st->cr();
+ result = true;
+ }
+ return result;
+}
+
+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::current();
+ 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;
+}
+
+// We don't build a headless jre for Windows
+bool os::is_headless_jre() { return false; }
+
+static jint initSock() {
+ WSADATA wsadata;
+
+ if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
+ jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
+ ::GetLastError());
+ return JNI_ERR;
+ }
+ return JNI_OK;
+}
+
+struct hostent* os::get_host_by_name(char* name) {
+ return (struct hostent*)gethostbyname(name);
+}
+
+int os::socket_close(int fd) {
+ return ::closesocket(fd);
+}
+
+int os::socket(int domain, int type, int protocol) {
+ return ::socket(domain, type, protocol);
+}
+
+int os::connect(int fd, struct sockaddr* him, socklen_t len) {
+ return ::connect(fd, him, len);
+}
+
+int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
+ return ::recv(fd, buf, (int)nBytes, flags);
+}
+
+int os::send(int fd, char* buf, size_t nBytes, uint flags) {
+ return ::send(fd, buf, (int)nBytes, flags);
+}
+
+int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
+ return ::send(fd, buf, (int)nBytes, flags);
+}
+
+// WINDOWS CONTEXT Flags for THREAD_SAMPLING
+#if defined(IA32)
+ #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
+#elif defined (AMD64)
+ #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
+#endif
+
+// returns true if thread could be suspended,
+// false otherwise
+static bool do_suspend(HANDLE* h) {
+ if (h != NULL) {
+ if (SuspendThread(*h) != ~0) {
+ return true;
+ }
+ }
+ return false;
+}
+
+// resume the thread
+// calling resume on an active thread is a no-op
+static void do_resume(HANDLE* h) {
+ if (h != NULL) {
+ ResumeThread(*h);
+ }
+}
+
+// retrieve a suspend/resume context capable handle
+// from the tid. Caller validates handle return value.
+void get_thread_handle_for_extended_context(HANDLE* h,
+ OSThread::thread_id_t tid) {
+ if (h != NULL) {
+ *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
+ }
+}
+
+// Thread sampling implementation
+//
+void os::SuspendedThreadTask::internal_do_task() {
+ CONTEXT ctxt;
+ HANDLE h = NULL;
+
+ // get context capable handle for thread
+ get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
+
+ // sanity
+ if (h == NULL || h == INVALID_HANDLE_VALUE) {
+ return;
+ }
+
+ // suspend the thread
+ if (do_suspend(&h)) {
+ ctxt.ContextFlags = sampling_context_flags;
+ // get thread context
+ GetThreadContext(h, &ctxt);
+ SuspendedThreadTaskContext context(_thread, &ctxt);
+ // pass context to Thread Sampling impl
+ do_task(context);
+ // resume thread
+ do_resume(&h);
+ }
+
+ // close handle
+ CloseHandle(h);
+}
+
+bool os::start_debugging(char *buf, int buflen) {
+ int len = (int)strlen(buf);
+ char *p = &buf[len];
+
+ jio_snprintf(p, buflen-len,
+ "\n\n"
+ "Do you want to debug the problem?\n\n"
+ "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
+ "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
+ "Otherwise, select 'No' to abort...",
+ os::current_process_id(), os::current_thread_id());
+
+ bool yes = os::message_box("Unexpected Error", buf);
+
+ if (yes) {
+ // os::breakpoint() calls DebugBreak(), which causes a breakpoint
+ // exception. If VM is running inside a debugger, the debugger will
+ // catch the exception. Otherwise, the breakpoint exception will reach
+ // the default windows exception handler, which can spawn a debugger and
+ // automatically attach to the dying VM.
+ os::breakpoint();
+ yes = false;
+ }
+ return yes;
+}
+
+void* os::get_default_process_handle() {
+ return (void*)GetModuleHandle(NULL);
+}
+
+// Builds a platform dependent Agent_OnLoad_<lib_name> function name
+// which is used to find statically linked in agents.
+// Additionally for windows, takes into account __stdcall names.
+// Parameters:
+// sym_name: Symbol in library we are looking for
+// lib_name: Name of library to look in, NULL for shared libs.
+// is_absolute_path == true if lib_name is absolute path to agent
+// such as "C:/a/b/L.dll"
+// == false if only the base name of the library is passed in
+// such as "L"
+char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
+ bool is_absolute_path) {
+ char *agent_entry_name;
+ size_t len;
+ size_t name_len;
+ size_t prefix_len = strlen(JNI_LIB_PREFIX);
+ size_t suffix_len = strlen(JNI_LIB_SUFFIX);
+ const char *start;
+
+ if (lib_name != NULL) {
+ len = name_len = strlen(lib_name);
+ if (is_absolute_path) {
+ // Need to strip path, prefix and suffix
+ if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
+ lib_name = ++start;
+ } else {
+ // Need to check for drive prefix
+ if ((start = strchr(lib_name, ':')) != NULL) {
+ lib_name = ++start;
+ }
+ }
+ if (len <= (prefix_len + suffix_len)) {
+ return NULL;
+ }
+ lib_name += prefix_len;
+ name_len = strlen(lib_name) - suffix_len;
+ }
+ }
+ len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
+ agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
+ if (agent_entry_name == NULL) {
+ return NULL;
+ }
+ if (lib_name != NULL) {
+ const char *p = strrchr(sym_name, '@');
+ if (p != NULL && p != sym_name) {
+ // sym_name == _Agent_OnLoad@XX
+ strncpy(agent_entry_name, sym_name, (p - sym_name));
+ agent_entry_name[(p-sym_name)] = '\0';
+ // agent_entry_name == _Agent_OnLoad
+ strcat(agent_entry_name, "_");
+ strncat(agent_entry_name, lib_name, name_len);
+ strcat(agent_entry_name, p);
+ // agent_entry_name == _Agent_OnLoad_lib_name@XX
+ } else {
+ strcpy(agent_entry_name, sym_name);
+ strcat(agent_entry_name, "_");
+ strncat(agent_entry_name, lib_name, name_len);
+ }
+ } else {
+ strcpy(agent_entry_name, sym_name);
+ }
+ return agent_entry_name;
+}
+
+#ifndef PRODUCT
+
+// test the code path in reserve_memory_special() that tries to allocate memory in a single
+// contiguous memory block at a particular address.
+// The test first tries to find a good approximate address to allocate at by using the same
+// method to allocate some memory at any address. The test then tries to allocate memory in
+// the vicinity (not directly after it to avoid possible by-chance use of that location)
+// This is of course only some dodgy assumption, there is no guarantee that the vicinity of
+// the previously allocated memory is available for allocation. The only actual failure
+// that is reported is when the test tries to allocate at a particular location but gets a
+// different valid one. A NULL return value at this point is not considered an error but may
+// be legitimate.
+// If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
+void TestReserveMemorySpecial_test() {
+ if (!UseLargePages) {
+ if (VerboseInternalVMTests) {
+ tty->print("Skipping test because large pages are disabled");
+ }
+ return;
+ }
+ // save current value of globals
+ bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
+ bool old_use_numa_interleaving = UseNUMAInterleaving;
+
+ // set globals to make sure we hit the correct code path
+ UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
+
+ // do an allocation at an address selected by the OS to get a good one.
+ const size_t large_allocation_size = os::large_page_size() * 4;
+ char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
+ if (result == NULL) {
+ if (VerboseInternalVMTests) {
+ tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
+ large_allocation_size);
+ }
+ } else {
+ os::release_memory_special(result, large_allocation_size);
+
+ // allocate another page within the recently allocated memory area which seems to be a good location. At least
+ // we managed to get it once.
+ const size_t expected_allocation_size = os::large_page_size();
+ char* expected_location = result + os::large_page_size();
+ char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
+ if (actual_location == NULL) {
+ if (VerboseInternalVMTests) {
+ tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
+ expected_location, large_allocation_size);
+ }
+ } else {
+ // release memory
+ os::release_memory_special(actual_location, expected_allocation_size);
+ // only now check, after releasing any memory to avoid any leaks.
+ assert(actual_location == expected_location,
+ "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
+ expected_location, expected_allocation_size, actual_location);
+ }
+ }
+
+ // restore globals
+ UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
+ UseNUMAInterleaving = old_use_numa_interleaving;
+}
+#endif // PRODUCT
+
+/*
+ All the defined signal names for Windows.
+
+ NOTE that not all of these names are accepted by FindSignal!
+
+ For various reasons some of these may be rejected at runtime.
+
+ Here are the names currently accepted by a user of sun.misc.Signal with
+ 1.4.1 (ignoring potential interaction with use of chaining, etc):
+
+ (LIST TBD)
+
+*/
+int os::get_signal_number(const char* name) {
+ static const struct {
+ char* name;
+ int number;
+ } siglabels [] =
+ // derived from version 6.0 VC98/include/signal.h
+ {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
+ "FPE", SIGFPE, // floating point exception
+ "SEGV", SIGSEGV, // segment violation
+ "INT", SIGINT, // interrupt
+ "TERM", SIGTERM, // software term signal from kill
+ "BREAK", SIGBREAK, // Ctrl-Break sequence
+ "ILL", SIGILL}; // illegal instruction
+ for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
+ if (strcmp(name, siglabels[i].name) == 0) {
+ return siglabels[i].number;
+ }
+ }
+ return -1;
+}
+
+// Fast current thread access
+
+int os::win32::_thread_ptr_offset = 0;
+
+static void call_wrapper_dummy() {}
+
+// We need to call the os_exception_wrapper once so that it sets
+// up the offset from FS of the thread pointer.
+void os::win32::initialize_thread_ptr_offset() {
+ os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
+ NULL, NULL, NULL, NULL);
+}