Mercurial > hg > graal-jvmci-8
diff src/os/windows/vm/os_windows.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | e195fe4c40c7 5a76ab815e34 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os/windows/vm/os_windows.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,3872 @@ +/* + * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +#ifdef _WIN64 +// Must be at least Windows 2000 or XP to use VectoredExceptions +#define _WIN32_WINNT 0x500 +#endif + +// do not include precompiled header file +# include "incls/_os_windows.cpp.incl" + +#ifdef _DEBUG +#include <crtdbg.h> +#endif + + +#include <windows.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/timeb.h> +#include <objidl.h> +#include <shlobj.h> + +#include <malloc.h> +#include <signal.h> +#include <direct.h> +#include <errno.h> +#include <fcntl.h> +#include <io.h> +#include <process.h> // For _beginthreadex(), _endthreadex() +#include <imagehlp.h> // For os::dll_address_to_function_name + +/* for enumerating dll libraries */ +#include <tlhelp32.h> +#include <vdmdbg.h> + +// for timer info max values which include all bits +#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) + +// For DLL loading/load error detection +// Values of PE COFF +#define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c +#define IMAGE_FILE_SIGNATURE_LENGTH 4 + +static HANDLE main_process; +static HANDLE main_thread; +static int main_thread_id; + +static FILETIME process_creation_time; +static FILETIME process_exit_time; +static FILETIME process_user_time; +static FILETIME process_kernel_time; + +#ifdef _WIN64 +PVOID topLevelVectoredExceptionHandler = NULL; +#endif + +#ifdef _M_IA64 +#define __CPU__ ia64 +#elif _M_AMD64 +#define __CPU__ amd64 +#else +#define __CPU__ i486 +#endif + +// save DLL module handle, used by GetModuleFileName + +HINSTANCE vm_lib_handle; +static int getLastErrorString(char *buf, size_t len); + +BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { + switch (reason) { + case DLL_PROCESS_ATTACH: + vm_lib_handle = hinst; + if(ForceTimeHighResolution) + timeBeginPeriod(1L); + break; + case DLL_PROCESS_DETACH: + if(ForceTimeHighResolution) + timeEndPeriod(1L); +#ifdef _WIN64 + if (topLevelVectoredExceptionHandler != NULL) { + RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler); + topLevelVectoredExceptionHandler = NULL; + } +#endif + break; + default: + break; + } + return true; +} + +static inline double fileTimeAsDouble(FILETIME* time) { + const double high = (double) ((unsigned int) ~0); + const double split = 10000000.0; + double result = (time->dwLowDateTime / split) + + time->dwHighDateTime * (high/split); + return result; +} + +// Implementation of os + +bool os::getenv(const char* name, char* buffer, int len) { + int result = GetEnvironmentVariable(name, buffer, len); + return result > 0 && result < len; +} + + +// No setuid programs under Windows. +bool os::have_special_privileges() { + return false; +} + + +// This method is a periodic task to check for misbehaving JNI applications +// under CheckJNI, we can add any periodic checks here. +// For Windows at the moment does nothing +void os::run_periodic_checks() { + return; +} + +#ifndef _WIN64 +LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); +#endif +void os::init_system_properties_values() { + /* sysclasspath, java_home, dll_dir */ + { + char *home_path; + char *dll_path; + char *pslash; + char *bin = "\\bin"; + char home_dir[MAX_PATH]; + + if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { + os::jvm_path(home_dir, sizeof(home_dir)); + // Found the full path to jvm[_g].dll. + // Now cut the path to <java_home>/jre if we can. + *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */ + pslash = strrchr(home_dir, '\\'); + if (pslash != NULL) { + *pslash = '\0'; /* get rid of \{client|server} */ + pslash = strrchr(home_dir, '\\'); + if (pslash != NULL) + *pslash = '\0'; /* get rid of \bin */ + } + } + + home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1); + if (home_path == NULL) + return; + strcpy(home_path, home_dir); + Arguments::set_java_home(home_path); + + dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1); + if (dll_path == NULL) + return; + strcpy(dll_path, home_dir); + strcat(dll_path, bin); + Arguments::set_dll_dir(dll_path); + + if (!set_boot_path('\\', ';')) + return; + } + + /* library_path */ + #define EXT_DIR "\\lib\\ext" + #define BIN_DIR "\\bin" + #define PACKAGE_DIR "\\Sun\\Java" + { + /* Win32 library search order (See the documentation for LoadLibrary): + * + * 1. The directory from which application is loaded. + * 2. The current directory + * 3. The system wide Java Extensions directory (Java only) + * 4. System directory (GetSystemDirectory) + * 5. Windows directory (GetWindowsDirectory) + * 6. The PATH environment variable + */ + + char *library_path; + char tmp[MAX_PATH]; + char *path_str = ::getenv("PATH"); + + library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + + sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10); + + library_path[0] = '\0'; + + GetModuleFileName(NULL, tmp, sizeof(tmp)); + *(strrchr(tmp, '\\')) = '\0'; + strcat(library_path, tmp); + + strcat(library_path, ";."); + + GetWindowsDirectory(tmp, sizeof(tmp)); + strcat(library_path, ";"); + strcat(library_path, tmp); + strcat(library_path, PACKAGE_DIR BIN_DIR); + + GetSystemDirectory(tmp, sizeof(tmp)); + strcat(library_path, ";"); + strcat(library_path, tmp); + + GetWindowsDirectory(tmp, sizeof(tmp)); + strcat(library_path, ";"); + strcat(library_path, tmp); + + if (path_str) { + strcat(library_path, ";"); + strcat(library_path, path_str); + } + + Arguments::set_library_path(library_path); + FREE_C_HEAP_ARRAY(char, library_path); + } + + /* Default extensions directory */ + { + char path[MAX_PATH]; + char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; + GetWindowsDirectory(path, MAX_PATH); + sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, + path, PACKAGE_DIR, EXT_DIR); + Arguments::set_ext_dirs(buf); + } + #undef EXT_DIR + #undef BIN_DIR + #undef PACKAGE_DIR + + /* Default endorsed standards directory. */ + { + #define ENDORSED_DIR "\\lib\\endorsed" + size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR); + char * buf = NEW_C_HEAP_ARRAY(char, len); + sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR); + Arguments::set_endorsed_dirs(buf); + #undef ENDORSED_DIR + } + +#ifndef _WIN64 + SetUnhandledExceptionFilter(Handle_FLT_Exception); +#endif + + // Done + return; +} + +void os::breakpoint() { + DebugBreak(); +} + +// Invoked from the BREAKPOINT Macro +extern "C" void breakpoint() { + os::breakpoint(); +} + +// Returns an estimate of the current stack pointer. Result must be guaranteed +// to point into the calling threads stack, and be no lower than the current +// stack pointer. + +address os::current_stack_pointer() { + int dummy; + address sp = (address)&dummy; + return sp; +} + +// os::current_stack_base() +// +// Returns the base of the stack, which is the stack's +// starting address. This function must be called +// while running on the stack of the thread being queried. + +address os::current_stack_base() { + MEMORY_BASIC_INFORMATION minfo; + address stack_bottom; + size_t stack_size; + + VirtualQuery(&minfo, &minfo, sizeof(minfo)); + stack_bottom = (address)minfo.AllocationBase; + stack_size = minfo.RegionSize; + + // Add up the sizes of all the regions with the same + // AllocationBase. + while( 1 ) + { + VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); + if ( stack_bottom == (address)minfo.AllocationBase ) + stack_size += minfo.RegionSize; + else + break; + } + +#ifdef _M_IA64 + // IA64 has memory and register stacks + stack_size = stack_size / 2; +#endif + return stack_bottom + stack_size; +} + +size_t os::current_stack_size() { + size_t sz; + MEMORY_BASIC_INFORMATION minfo; + VirtualQuery(&minfo, &minfo, sizeof(minfo)); + sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; + return sz; +} + + +LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); + +// Thread start routine for all new Java threads +static unsigned __stdcall java_start(Thread* thread) { + // Try to randomize the cache line index of hot stack frames. + // This helps when threads of the same stack traces evict each other's + // cache lines. The threads can be either from the same JVM instance, or + // from different JVM instances. The benefit is especially true for + // processors with hyperthreading technology. + static int counter = 0; + int pid = os::current_process_id(); + _alloca(((pid ^ counter++) & 7) * 128); + + OSThread* osthr = thread->osthread(); + assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); + + if (UseNUMA) { + int lgrp_id = os::numa_get_group_id(); + if (lgrp_id != -1) { + thread->set_lgrp_id(lgrp_id); + } + } + + + if (UseVectoredExceptions) { + // If we are using vectored exception we don't need to set a SEH + thread->run(); + } + else { + // Install a win32 structured exception handler around every thread created + // by VM, so VM can genrate error dump when an exception occurred in non- + // Java thread (e.g. VM thread). + __try { + thread->run(); + } __except(topLevelExceptionFilter( + (_EXCEPTION_POINTERS*)_exception_info())) { + // Nothing to do. + } + } + + // One less thread is executing + // When the VMThread gets here, the main thread may have already exited + // which frees the CodeHeap containing the Atomic::add code + if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { + Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); + } + + return 0; +} + +static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) { + // Allocate the OSThread object + OSThread* osthread = new OSThread(NULL, NULL); + if (osthread == NULL) return NULL; + + // Initialize support for Java interrupts + HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); + if (interrupt_event == NULL) { + delete osthread; + return NULL; + } + osthread->set_interrupt_event(interrupt_event); + + // Store info on the Win32 thread into the OSThread + osthread->set_thread_handle(thread_handle); + osthread->set_thread_id(thread_id); + + if (UseNUMA) { + int lgrp_id = os::numa_get_group_id(); + if (lgrp_id != -1) { + thread->set_lgrp_id(lgrp_id); + } + } + + // Initial thread state is INITIALIZED, not SUSPENDED + osthread->set_state(INITIALIZED); + + return osthread; +} + + +bool os::create_attached_thread(JavaThread* thread) { +#ifdef ASSERT + thread->verify_not_published(); +#endif + HANDLE thread_h; + if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), + &thread_h, THREAD_ALL_ACCESS, false, 0)) { + fatal("DuplicateHandle failed\n"); + } + OSThread* osthread = create_os_thread(thread, thread_h, + (int)current_thread_id()); + if (osthread == NULL) { + return false; + } + + // Initial thread state is RUNNABLE + osthread->set_state(RUNNABLE); + + thread->set_osthread(osthread); + return true; +} + +bool os::create_main_thread(JavaThread* thread) { +#ifdef ASSERT + thread->verify_not_published(); +#endif + if (_starting_thread == NULL) { + _starting_thread = create_os_thread(thread, main_thread, main_thread_id); + if (_starting_thread == NULL) { + return false; + } + } + + // The primordial thread is runnable from the start) + _starting_thread->set_state(RUNNABLE); + + thread->set_osthread(_starting_thread); + return true; +} + +// Allocate and initialize a new OSThread +bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { + unsigned thread_id; + + // Allocate the OSThread object + OSThread* osthread = new OSThread(NULL, NULL); + if (osthread == NULL) { + return false; + } + + // Initialize support for Java interrupts + HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); + if (interrupt_event == NULL) { + delete osthread; + return NULL; + } + osthread->set_interrupt_event(interrupt_event); + osthread->set_interrupted(false); + + thread->set_osthread(osthread); + + if (stack_size == 0) { + switch (thr_type) { + case os::java_thread: + // Java threads use ThreadStackSize which default value can be changed with the flag -Xss + if (JavaThread::stack_size_at_create() > 0) + stack_size = JavaThread::stack_size_at_create(); + break; + case os::compiler_thread: + if (CompilerThreadStackSize > 0) { + stack_size = (size_t)(CompilerThreadStackSize * K); + break; + } // else fall through: + // use VMThreadStackSize if CompilerThreadStackSize is not defined + case os::vm_thread: + case os::pgc_thread: + case os::cgc_thread: + case os::watcher_thread: + if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); + break; + } + } + + // Create the Win32 thread + // + // Contrary to what MSDN document says, "stack_size" in _beginthreadex() + // does not specify stack size. Instead, it specifies the size of + // initially committed space. The stack size is determined by + // PE header in the executable. If the committed "stack_size" is larger + // than default value in the PE header, the stack is rounded up to the + // nearest multiple of 1MB. For example if the launcher has default + // stack size of 320k, specifying any size less than 320k does not + // affect the actual stack size at all, it only affects the initial + // commitment. On the other hand, specifying 'stack_size' larger than + // default value may cause significant increase in memory usage, because + // not only the stack space will be rounded up to MB, but also the + // entire space is committed upfront. + // + // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' + // for CreateThread() that can treat 'stack_size' as stack size. However we + // are not supposed to call CreateThread() directly according to MSDN + // document because JVM uses C runtime library. The good news is that the + // flag appears to work with _beginthredex() as well. + +#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION +#define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) +#endif + + HANDLE thread_handle = + (HANDLE)_beginthreadex(NULL, + (unsigned)stack_size, + (unsigned (__stdcall *)(void*)) java_start, + thread, + CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, + &thread_id); + if (thread_handle == NULL) { + // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again + // without the flag. + thread_handle = + (HANDLE)_beginthreadex(NULL, + (unsigned)stack_size, + (unsigned (__stdcall *)(void*)) java_start, + thread, + CREATE_SUSPENDED, + &thread_id); + } + if (thread_handle == NULL) { + // Need to clean up stuff we've allocated so far + CloseHandle(osthread->interrupt_event()); + thread->set_osthread(NULL); + delete osthread; + return NULL; + } + + Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); + + // Store info on the Win32 thread into the OSThread + osthread->set_thread_handle(thread_handle); + osthread->set_thread_id(thread_id); + + // Initial thread state is INITIALIZED, not SUSPENDED + osthread->set_state(INITIALIZED); + + // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain + return true; +} + + +// Free Win32 resources related to the OSThread +void os::free_thread(OSThread* osthread) { + assert(osthread != NULL, "osthread not set"); + CloseHandle(osthread->thread_handle()); + CloseHandle(osthread->interrupt_event()); + delete osthread; +} + + +static int has_performance_count = 0; +static jlong first_filetime; +static jlong initial_performance_count; +static jlong performance_frequency; + + +jlong as_long(LARGE_INTEGER x) { + jlong result = 0; // initialization to avoid warning + set_high(&result, x.HighPart); + set_low(&result, x.LowPart); + return result; +} + + +jlong os::elapsed_counter() { + LARGE_INTEGER count; + if (has_performance_count) { + QueryPerformanceCounter(&count); + return as_long(count) - initial_performance_count; + } else { + FILETIME wt; + GetSystemTimeAsFileTime(&wt); + return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); + } +} + + +jlong os::elapsed_frequency() { + if (has_performance_count) { + return performance_frequency; + } else { + // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. + return 10000000; + } +} + + +julong os::available_memory() { + return win32::available_memory(); +} + +julong os::win32::available_memory() { + // FIXME: GlobalMemoryStatus() may return incorrect value if total memory + // is larger than 4GB + MEMORYSTATUS ms; + GlobalMemoryStatus(&ms); + + return (julong)ms.dwAvailPhys; +} + +julong os::physical_memory() { + return win32::physical_memory(); +} + +julong os::allocatable_physical_memory(julong size) { + return MIN2(size, (julong)1400*M); +} + +// VC6 lacks DWORD_PTR +#if _MSC_VER < 1300 +typedef UINT_PTR DWORD_PTR; +#endif + +int os::active_processor_count() { + DWORD_PTR lpProcessAffinityMask = 0; + DWORD_PTR lpSystemAffinityMask = 0; + int proc_count = processor_count(); + if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && + GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { + // Nof active processors is number of bits in process affinity mask + int bitcount = 0; + while (lpProcessAffinityMask != 0) { + lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); + bitcount++; + } + return bitcount; + } else { + return proc_count; + } +} + +bool os::distribute_processes(uint length, uint* distribution) { + // Not yet implemented. + return false; +} + +bool os::bind_to_processor(uint processor_id) { + // Not yet implemented. + return false; +} + +static void initialize_performance_counter() { + LARGE_INTEGER count; + if (QueryPerformanceFrequency(&count)) { + has_performance_count = 1; + performance_frequency = as_long(count); + QueryPerformanceCounter(&count); + initial_performance_count = as_long(count); + } else { + has_performance_count = 0; + FILETIME wt; + GetSystemTimeAsFileTime(&wt); + first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); + } +} + + +double os::elapsedTime() { + return (double) elapsed_counter() / (double) elapsed_frequency(); +} + + +// Windows format: +// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. +// Java format: +// Java standards require the number of milliseconds since 1/1/1970 + +// Constant offset - calculated using offset() +static jlong _offset = 116444736000000000; +// Fake time counter for reproducible results when debugging +static jlong fake_time = 0; + +#ifdef ASSERT +// Just to be safe, recalculate the offset in debug mode +static jlong _calculated_offset = 0; +static int _has_calculated_offset = 0; + +jlong offset() { + if (_has_calculated_offset) return _calculated_offset; + SYSTEMTIME java_origin; + java_origin.wYear = 1970; + java_origin.wMonth = 1; + java_origin.wDayOfWeek = 0; // ignored + java_origin.wDay = 1; + java_origin.wHour = 0; + java_origin.wMinute = 0; + java_origin.wSecond = 0; + java_origin.wMilliseconds = 0; + FILETIME jot; + if (!SystemTimeToFileTime(&java_origin, &jot)) { + fatal1("Error = %d\nWindows error", GetLastError()); + } + _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); + _has_calculated_offset = 1; + assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); + return _calculated_offset; +} +#else +jlong offset() { + return _offset; +} +#endif + +jlong windows_to_java_time(FILETIME wt) { + jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); + return (a - offset()) / 10000; +} + +FILETIME java_to_windows_time(jlong l) { + jlong a = (l * 10000) + offset(); + FILETIME result; + result.dwHighDateTime = high(a); + result.dwLowDateTime = low(a); + return result; +} + +jlong os::timeofday() { + FILETIME wt; + GetSystemTimeAsFileTime(&wt); + return windows_to_java_time(wt); +} + + +// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis +// _use_global_time is only set if CacheTimeMillis is true +jlong os::javaTimeMillis() { + if (UseFakeTimers) { + return fake_time++; + } else { + return (_use_global_time ? read_global_time() : timeofday()); + } +} + +#define NANOS_PER_SEC CONST64(1000000000) +#define NANOS_PER_MILLISEC 1000000 +jlong os::javaTimeNanos() { + if (!has_performance_count) { + return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do. + } else { + LARGE_INTEGER current_count; + QueryPerformanceCounter(¤t_count); + double current = as_long(current_count); + double freq = performance_frequency; + jlong time = (jlong)((current/freq) * NANOS_PER_SEC); + return time; + } +} + +void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { + if (!has_performance_count) { + // javaTimeMillis() doesn't have much percision, + // but it is not going to wrap -- so all 64 bits + info_ptr->max_value = ALL_64_BITS; + + // this is a wall clock timer, so may skip + info_ptr->may_skip_backward = true; + info_ptr->may_skip_forward = true; + } else { + jlong freq = performance_frequency; + if (freq < NANOS_PER_SEC) { + // the performance counter is 64 bits and we will + // be multiplying it -- so no wrap in 64 bits + info_ptr->max_value = ALL_64_BITS; + } else if (freq > NANOS_PER_SEC) { + // use the max value the counter can reach to + // determine the max value which could be returned + julong max_counter = (julong)ALL_64_BITS; + info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC)); + } else { + // the performance counter is 64 bits and we will + // be using it directly -- so no wrap in 64 bits + info_ptr->max_value = ALL_64_BITS; + } + + // using a counter, so no skipping + info_ptr->may_skip_backward = false; + info_ptr->may_skip_forward = false; + } + info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time +} + +char* os::local_time_string(char *buf, size_t buflen) { + SYSTEMTIME st; + GetLocalTime(&st); + jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", + st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); + return buf; +} + +bool os::getTimesSecs(double* process_real_time, + double* process_user_time, + double* process_system_time) { + HANDLE h_process = GetCurrentProcess(); + FILETIME create_time, exit_time, kernel_time, user_time; + BOOL result = GetProcessTimes(h_process, + &create_time, + &exit_time, + &kernel_time, + &user_time); + if (result != 0) { + FILETIME wt; + GetSystemTimeAsFileTime(&wt); + jlong rtc_millis = windows_to_java_time(wt); + jlong user_millis = windows_to_java_time(user_time); + jlong system_millis = windows_to_java_time(kernel_time); + *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); + *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); + *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); + return true; + } else { + return false; + } +} + +void os::shutdown() { + + // allow PerfMemory to attempt cleanup of any persistent resources + perfMemory_exit(); + + // flush buffered output, finish log files + ostream_abort(); + + // Check for abort hook + abort_hook_t abort_hook = Arguments::abort_hook(); + if (abort_hook != NULL) { + abort_hook(); + } +} + +void os::abort(bool dump_core) +{ + os::shutdown(); + // no core dump on Windows + ::exit(1); +} + +// Die immediately, no exit hook, no abort hook, no cleanup. +void os::die() { + _exit(-1); +} + +// Directory routines copied from src/win32/native/java/io/dirent_md.c +// * dirent_md.c 1.15 00/02/02 +// +// The declarations for DIR and struct dirent are in jvm_win32.h. + +/* Caller must have already run dirname through JVM_NativePath, which removes + duplicate slashes and converts all instances of '/' into '\\'. */ + +DIR * +os::opendir(const char *dirname) +{ + assert(dirname != NULL, "just checking"); // hotspot change + DIR *dirp = (DIR *)malloc(sizeof(DIR)); + DWORD fattr; // hotspot change + char alt_dirname[4] = { 0, 0, 0, 0 }; + + if (dirp == 0) { + errno = ENOMEM; + return 0; + } + + /* + * Win32 accepts "\" in its POSIX stat(), but refuses to treat it + * as a directory in FindFirstFile(). We detect this case here and + * prepend the current drive name. + */ + if (dirname[1] == '\0' && dirname[0] == '\\') { + alt_dirname[0] = _getdrive() + 'A' - 1; + alt_dirname[1] = ':'; + alt_dirname[2] = '\\'; + alt_dirname[3] = '\0'; + dirname = alt_dirname; + } + + dirp->path = (char *)malloc(strlen(dirname) + 5); + if (dirp->path == 0) { + free(dirp); + errno = ENOMEM; + return 0; + } + strcpy(dirp->path, dirname); + + fattr = GetFileAttributes(dirp->path); + if (fattr == 0xffffffff) { + free(dirp->path); + free(dirp); + errno = ENOENT; + return 0; + } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { + free(dirp->path); + free(dirp); + errno = ENOTDIR; + return 0; + } + + /* Append "*.*", or possibly "\\*.*", to path */ + if (dirp->path[1] == ':' + && (dirp->path[2] == '\0' + || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { + /* No '\\' needed for cases like "Z:" or "Z:\" */ + strcat(dirp->path, "*.*"); + } else { + strcat(dirp->path, "\\*.*"); + } + + dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); + if (dirp->handle == INVALID_HANDLE_VALUE) { + if (GetLastError() != ERROR_FILE_NOT_FOUND) { + free(dirp->path); + free(dirp); + errno = EACCES; + return 0; + } + } + return dirp; +} + +/* parameter dbuf unused on Windows */ + +struct dirent * +os::readdir(DIR *dirp, dirent *dbuf) +{ + assert(dirp != NULL, "just checking"); // hotspot change + if (dirp->handle == INVALID_HANDLE_VALUE) { + return 0; + } + + strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); + + if (!FindNextFile(dirp->handle, &dirp->find_data)) { + if (GetLastError() == ERROR_INVALID_HANDLE) { + errno = EBADF; + return 0; + } + FindClose(dirp->handle); + dirp->handle = INVALID_HANDLE_VALUE; + } + + return &dirp->dirent; +} + +int +os::closedir(DIR *dirp) +{ + assert(dirp != NULL, "just checking"); // hotspot change + if (dirp->handle != INVALID_HANDLE_VALUE) { + if (!FindClose(dirp->handle)) { + errno = EBADF; + return -1; + } + dirp->handle = INVALID_HANDLE_VALUE; + } + free(dirp->path); + free(dirp); + return 0; +} + +const char* os::dll_file_extension() { return ".dll"; } + +const char * os::get_temp_directory() +{ + static char path_buf[MAX_PATH]; + if (GetTempPath(MAX_PATH, path_buf)>0) + return path_buf; + else{ + path_buf[0]='\0'; + return path_buf; + } +} + +// Needs to be in os specific directory because windows requires another +// header file <direct.h> +const char* os::get_current_directory(char *buf, int buflen) { + return _getcwd(buf, buflen); +} + +//----------------------------------------------------------- +// Helper functions for fatal error handler + +// The following library functions are resolved dynamically at runtime: + +// PSAPI functions, for Windows NT, 2000, XP + +// psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform +// SDK from Microsoft. Here are the definitions copied from psapi.h +typedef struct _MODULEINFO { + LPVOID lpBaseOfDll; + DWORD SizeOfImage; + LPVOID EntryPoint; +} MODULEINFO, *LPMODULEINFO; + +static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD ); +static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD ); +static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD ); + +// ToolHelp Functions, for Windows 95, 98 and ME + +static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ; +static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ; +static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ; + +bool _has_psapi; +bool _psapi_init = false; +bool _has_toolhelp; + +static bool _init_psapi() { + HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ; + if( psapi == NULL ) return false ; + + _EnumProcessModules = CAST_TO_FN_PTR( + BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD), + GetProcAddress(psapi, "EnumProcessModules")) ; + _GetModuleFileNameEx = CAST_TO_FN_PTR( + DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD), + GetProcAddress(psapi, "GetModuleFileNameExA")); + _GetModuleInformation = CAST_TO_FN_PTR( + BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD), + GetProcAddress(psapi, "GetModuleInformation")); + + _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation); + _psapi_init = true; + return _has_psapi; +} + +static bool _init_toolhelp() { + HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ; + if (kernel32 == NULL) return false ; + + _CreateToolhelp32Snapshot = CAST_TO_FN_PTR( + HANDLE(WINAPI *)(DWORD,DWORD), + GetProcAddress(kernel32, "CreateToolhelp32Snapshot")); + _Module32First = CAST_TO_FN_PTR( + BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), + GetProcAddress(kernel32, "Module32First" )); + _Module32Next = CAST_TO_FN_PTR( + BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), + GetProcAddress(kernel32, "Module32Next" )); + + _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next); + return _has_toolhelp; +} + +#ifdef _WIN64 +// Helper routine which returns true if address in +// within the NTDLL address space. +// +static bool _addr_in_ntdll( address addr ) +{ + HMODULE hmod; + MODULEINFO minfo; + + hmod = GetModuleHandle("NTDLL.DLL"); + if ( hmod == NULL ) return false; + if ( !_GetModuleInformation( GetCurrentProcess(), hmod, + &minfo, sizeof(MODULEINFO)) ) + return false; + + if ( (addr >= minfo.lpBaseOfDll) && + (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) + return true; + else + return false; +} +#endif + + +// Enumerate all modules for a given process ID +// +// Notice that Windows 95/98/Me and Windows NT/2000/XP have +// different API for doing this. We use PSAPI.DLL on NT based +// Windows and ToolHelp on 95/98/Me. + +// Callback function that is called by enumerate_modules() on +// every DLL module. +// Input parameters: +// int pid, +// char* module_file_name, +// address module_base_addr, +// unsigned module_size, +// void* param +typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); + +// enumerate_modules for Windows NT, using PSAPI +static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) +{ + HANDLE hProcess ; + +# define MAX_NUM_MODULES 128 + HMODULE modules[MAX_NUM_MODULES]; + static char filename[ MAX_PATH ]; + int result = 0; + + if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0; + + hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, + FALSE, pid ) ; + if (hProcess == NULL) return 0; + + DWORD size_needed; + if (!_EnumProcessModules(hProcess, modules, + sizeof(modules), &size_needed)) { + CloseHandle( hProcess ); + return 0; + } + + // number of modules that are currently loaded + int num_modules = size_needed / sizeof(HMODULE); + + for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { + // Get Full pathname: + if(!_GetModuleFileNameEx(hProcess, modules[i], + filename, sizeof(filename))) { + filename[0] = '\0'; + } + + MODULEINFO modinfo; + if (!_GetModuleInformation(hProcess, modules[i], + &modinfo, sizeof(modinfo))) { + modinfo.lpBaseOfDll = NULL; + modinfo.SizeOfImage = 0; + } + + // Invoke callback function + result = func(pid, filename, (address)modinfo.lpBaseOfDll, + modinfo.SizeOfImage, param); + if (result) break; + } + + CloseHandle( hProcess ) ; + return result; +} + + +// enumerate_modules for Windows 95/98/ME, using TOOLHELP +static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) +{ + HANDLE hSnapShot ; + static MODULEENTRY32 modentry ; + int result = 0; + + if (!_has_toolhelp) return 0; + + // Get a handle to a Toolhelp snapshot of the system + hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ; + if( hSnapShot == INVALID_HANDLE_VALUE ) { + return FALSE ; + } + + // iterate through all modules + modentry.dwSize = sizeof(MODULEENTRY32) ; + bool not_done = _Module32First( hSnapShot, &modentry ) != 0; + + while( not_done ) { + // invoke the callback + result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, + modentry.modBaseSize, param); + if (result) break; + + modentry.dwSize = sizeof(MODULEENTRY32) ; + not_done = _Module32Next( hSnapShot, &modentry ) != 0; + } + + CloseHandle(hSnapShot); + return result; +} + +int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) +{ + // Get current process ID if caller doesn't provide it. + if (!pid) pid = os::current_process_id(); + + if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); + else return _enumerate_modules_windows(pid, func, param); +} + +struct _modinfo { + address addr; + char* full_path; // point to a char buffer + int buflen; // size of the buffer + address base_addr; +}; + +static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, + unsigned size, void * param) { + struct _modinfo *pmod = (struct _modinfo *)param; + if (!pmod) return -1; + + if (base_addr <= pmod->addr && + base_addr+size > pmod->addr) { + // if a buffer is provided, copy path name to the buffer + if (pmod->full_path) { + jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); + } + pmod->base_addr = base_addr; + return 1; + } + return 0; +} + +bool os::dll_address_to_library_name(address addr, char* buf, + int buflen, int* offset) { +// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always +// return the full path to the DLL file, sometimes it returns path +// to the corresponding PDB file (debug info); sometimes it only +// returns partial path, which makes life painful. + + struct _modinfo mi; + mi.addr = addr; + mi.full_path = buf; + mi.buflen = buflen; + int pid = os::current_process_id(); + if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { + // buf already contains path name + if (offset) *offset = addr - mi.base_addr; + return true; + } else { + if (buf) buf[0] = '\0'; + if (offset) *offset = -1; + return false; + } +} + +bool os::dll_address_to_function_name(address addr, char *buf, + int buflen, int *offset) { + // Unimplemented on Windows - in order to use SymGetSymFromAddr(), + // we need to initialize imagehlp/dbghelp, then load symbol table + // for every module. That's too much work to do after a fatal error. + // For an example on how to implement this function, see 1.4.2. + if (offset) *offset = -1; + if (buf) buf[0] = '\0'; + return false; +} + +// save the start and end address of jvm.dll into param[0] and param[1] +static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, + unsigned size, void * param) { + if (!param) return -1; + + if (base_addr <= (address)_locate_jvm_dll && + base_addr+size > (address)_locate_jvm_dll) { + ((address*)param)[0] = base_addr; + ((address*)param)[1] = base_addr + size; + return 1; + } + return 0; +} + +address vm_lib_location[2]; // start and end address of jvm.dll + +// check if addr is inside jvm.dll +bool os::address_is_in_vm(address addr) { + if (!vm_lib_location[0] || !vm_lib_location[1]) { + int pid = os::current_process_id(); + if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { + assert(false, "Can't find jvm module."); + return false; + } + } + + return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); +} + +// print module info; param is outputStream* +static int _print_module(int pid, char* fname, address base, + unsigned size, void* param) { + if (!param) return -1; + + outputStream* st = (outputStream*)param; + + address end_addr = base + size; + st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); + return 0; +} + +// Loads .dll/.so and +// in case of error it checks if .dll/.so was built for the +// same architecture as Hotspot is running on +void * os::dll_load(const char *name, char *ebuf, int ebuflen) +{ + void * result = LoadLibrary(name); + if (result != NULL) + { + return result; + } + + long errcode = GetLastError(); + if (errcode == ERROR_MOD_NOT_FOUND) { + strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); + ebuf[ebuflen-1]='\0'; + return NULL; + } + + // Parsing dll below + // If we can read dll-info and find that dll was built + // for an architecture other than Hotspot is running in + // - then print to buffer "DLL was built for a different architecture" + // else call getLastErrorString to obtain system error message + + // Read system error message into ebuf + // It may or may not be overwritten below (in the for loop and just above) + getLastErrorString(ebuf, (size_t) ebuflen); + ebuf[ebuflen-1]='\0'; + int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); + if (file_descriptor<0) + { + return NULL; + } + + uint32_t signature_offset; + uint16_t lib_arch=0; + bool failed_to_get_lib_arch= + ( + //Go to position 3c in the dll + (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) + || + // Read loacation of signature + (sizeof(signature_offset)!= + (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) + || + //Go to COFF File Header in dll + //that is located after"signature" (4 bytes long) + (os::seek_to_file_offset(file_descriptor, + signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) + || + //Read field that contains code of architecture + // that dll was build for + (sizeof(lib_arch)!= + (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) + ); + + ::close(file_descriptor); + if (failed_to_get_lib_arch) + { + // file i/o error - report getLastErrorString(...) msg + return NULL; + } + + typedef struct + { + uint16_t arch_code; + char* arch_name; + } arch_t; + + static const arch_t arch_array[]={ + {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, + {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, + {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} + }; + #if (defined _M_IA64) + static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; + #elif (defined _M_AMD64) + static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; + #elif (defined _M_IX86) + static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; + #else + #error Method os::dll_load requires that one of following \ + is defined :_M_IA64,_M_AMD64 or _M_IX86 + #endif + + + // Obtain a string for printf operation + // lib_arch_str shall contain string what platform this .dll was built for + // running_arch_str shall string contain what platform Hotspot was built for + char *running_arch_str=NULL,*lib_arch_str=NULL; + for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) + { + if (lib_arch==arch_array[i].arch_code) + lib_arch_str=arch_array[i].arch_name; + if (running_arch==arch_array[i].arch_code) + running_arch_str=arch_array[i].arch_name; + } + + assert(running_arch_str, + "Didn't find runing architecture code in arch_array"); + + // If the architure is right + // but some other error took place - report getLastErrorString(...) msg + if (lib_arch == running_arch) + { + return NULL; + } + + if (lib_arch_str!=NULL) + { + ::_snprintf(ebuf, ebuflen-1, + "Can't load %s-bit .dll on a %s-bit platform", + lib_arch_str,running_arch_str); + } + else + { + // don't know what architecture this dll was build for + ::_snprintf(ebuf, ebuflen-1, + "Can't load this .dll (machine code=0x%x) on a %s-bit platform", + lib_arch,running_arch_str); + } + + return NULL; +} + + +void os::print_dll_info(outputStream *st) { + int pid = os::current_process_id(); + st->print_cr("Dynamic libraries:"); + enumerate_modules(pid, _print_module, (void *)st); +} + +void os::print_os_info(outputStream* st) { + st->print("OS:"); + + OSVERSIONINFOEX osvi; + ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); + osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); + + if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { + st->print_cr("N/A"); + return; + } + + int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; + + if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { + switch (os_vers) { + case 3051: st->print(" Windows NT 3.51"); break; + case 4000: st->print(" Windows NT 4.0"); break; + case 5000: st->print(" Windows 2000"); break; + case 5001: st->print(" Windows XP"); break; + case 5002: st->print(" Windows Server 2003 family"); break; + case 6000: st->print(" Windows Vista"); break; + default: // future windows, print out its major and minor versions + st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); + } + } else { + switch (os_vers) { + case 4000: st->print(" Windows 95"); break; + case 4010: st->print(" Windows 98"); break; + case 4090: st->print(" Windows Me"); break; + default: // future windows, print out its major and minor versions + st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); + } + } + + st->print(" Build %d", osvi.dwBuildNumber); + st->print(" %s", osvi.szCSDVersion); // service pack + st->cr(); +} + +void os::print_memory_info(outputStream* st) { + st->print("Memory:"); + st->print(" %dk page", os::vm_page_size()>>10); + + // FIXME: GlobalMemoryStatus() may return incorrect value if total memory + // is larger than 4GB + MEMORYSTATUS ms; + GlobalMemoryStatus(&ms); + + st->print(", physical %uk", os::physical_memory() >> 10); + st->print("(%uk free)", os::available_memory() >> 10); + + st->print(", swap %uk", ms.dwTotalPageFile >> 10); + st->print("(%uk free)", ms.dwAvailPageFile >> 10); + st->cr(); +} + +void os::print_siginfo(outputStream *st, void *siginfo) { + EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; + st->print("siginfo:"); + st->print(" ExceptionCode=0x%x", er->ExceptionCode); + + if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && + er->NumberParameters >= 2) { + switch (er->ExceptionInformation[0]) { + case 0: st->print(", reading address"); break; + case 1: st->print(", writing address"); break; + default: st->print(", ExceptionInformation=" INTPTR_FORMAT, + er->ExceptionInformation[0]); + } + st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); + } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && + er->NumberParameters >= 2 && UseSharedSpaces) { + FileMapInfo* mapinfo = FileMapInfo::current_info(); + if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { + st->print("\n\nError accessing class data sharing archive." \ + " Mapped file inaccessible during execution, " \ + " possible disk/network problem."); + } + } else { + int num = er->NumberParameters; + if (num > 0) { + st->print(", ExceptionInformation="); + for (int i = 0; i < num; i++) { + st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); + } + } + } + st->cr(); +} + +void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { + // do nothing +} + +static char saved_jvm_path[MAX_PATH] = {0}; + +// Find the full path to the current module, jvm.dll or jvm_g.dll +void os::jvm_path(char *buf, jint buflen) { + // Error checking. + if (buflen < MAX_PATH) { + assert(false, "must use a large-enough buffer"); + buf[0] = '\0'; + return; + } + // Lazy resolve the path to current module. + if (saved_jvm_path[0] != 0) { + strcpy(buf, saved_jvm_path); + return; + } + + GetModuleFileName(vm_lib_handle, buf, buflen); + strcpy(saved_jvm_path, buf); +} + + +void os::print_jni_name_prefix_on(outputStream* st, int args_size) { +#ifndef _WIN64 + st->print("_"); +#endif +} + + +void os::print_jni_name_suffix_on(outputStream* st, int args_size) { +#ifndef _WIN64 + st->print("@%d", args_size * sizeof(int)); +#endif +} + +// sun.misc.Signal +// NOTE that this is a workaround for an apparent kernel bug where if +// a signal handler for SIGBREAK is installed then that signal handler +// takes priority over the console control handler for CTRL_CLOSE_EVENT. +// See bug 4416763. +static void (*sigbreakHandler)(int) = NULL; + +static void UserHandler(int sig, void *siginfo, void *context) { + os::signal_notify(sig); + // We need to reinstate the signal handler each time... + os::signal(sig, (void*)UserHandler); +} + +void* os::user_handler() { + return (void*) UserHandler; +} + +void* os::signal(int signal_number, void* handler) { + if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { + void (*oldHandler)(int) = sigbreakHandler; + sigbreakHandler = (void (*)(int)) handler; + return (void*) oldHandler; + } else { + return (void*)::signal(signal_number, (void (*)(int))handler); + } +} + +void os::signal_raise(int signal_number) { + raise(signal_number); +} + +// The Win32 C runtime library maps all console control events other than ^C +// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, +// logoff, and shutdown events. We therefore install our own console handler +// that raises SIGTERM for the latter cases. +// +static BOOL WINAPI consoleHandler(DWORD event) { + switch(event) { + case CTRL_C_EVENT: + if (is_error_reported()) { + // Ctrl-C is pressed during error reporting, likely because the error + // handler fails to abort. Let VM die immediately. + os::die(); + } + + os::signal_raise(SIGINT); + return TRUE; + break; + case CTRL_BREAK_EVENT: + if (sigbreakHandler != NULL) { + (*sigbreakHandler)(SIGBREAK); + } + return TRUE; + break; + case CTRL_CLOSE_EVENT: + case CTRL_LOGOFF_EVENT: + case CTRL_SHUTDOWN_EVENT: + os::signal_raise(SIGTERM); + return TRUE; + break; + default: + break; + } + return FALSE; +} + +/* + * The following code is moved from os.cpp for making this + * code platform specific, which it is by its very nature. + */ + +// Return maximum OS signal used + 1 for internal use only +// Used as exit signal for signal_thread +int os::sigexitnum_pd(){ + return NSIG; +} + +// a counter for each possible signal value, including signal_thread exit signal +static volatile jint pending_signals[NSIG+1] = { 0 }; +static HANDLE sig_sem; + +void os::signal_init_pd() { + // Initialize signal structures + memset((void*)pending_signals, 0, sizeof(pending_signals)); + + sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); + + // Programs embedding the VM do not want it to attempt to receive + // events like CTRL_LOGOFF_EVENT, which are used to implement the + // shutdown hooks mechanism introduced in 1.3. For example, when + // the VM is run as part of a Windows NT service (i.e., a servlet + // engine in a web server), the correct behavior is for any console + // control handler to return FALSE, not TRUE, because the OS's + // "final" handler for such events allows the process to continue if + // it is a service (while terminating it if it is not a service). + // To make this behavior uniform and the mechanism simpler, we + // completely disable the VM's usage of these console events if -Xrs + // (=ReduceSignalUsage) is specified. This means, for example, that + // the CTRL-BREAK thread dump mechanism is also disabled in this + // case. See bugs 4323062, 4345157, and related bugs. + + if (!ReduceSignalUsage) { + // Add a CTRL-C handler + SetConsoleCtrlHandler(consoleHandler, TRUE); + } +} + +void os::signal_notify(int signal_number) { + BOOL ret; + + Atomic::inc(&pending_signals[signal_number]); + ret = ::ReleaseSemaphore(sig_sem, 1, NULL); + assert(ret != 0, "ReleaseSemaphore() failed"); +} + +static int check_pending_signals(bool wait_for_signal) { + DWORD ret; + while (true) { + for (int i = 0; i < NSIG + 1; i++) { + jint n = pending_signals[i]; + if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { + return i; + } + } + if (!wait_for_signal) { + return -1; + } + + JavaThread *thread = JavaThread::current(); + + ThreadBlockInVM tbivm(thread); + + bool threadIsSuspended; + do { + thread->set_suspend_equivalent(); + // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() + ret = ::WaitForSingleObject(sig_sem, INFINITE); + assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); + + // were we externally suspended while we were waiting? + threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); + if (threadIsSuspended) { + // + // The semaphore has been incremented, but while we were waiting + // another thread suspended us. We don't want to continue running + // while suspended because that would surprise the thread that + // suspended us. + // + ret = ::ReleaseSemaphore(sig_sem, 1, NULL); + assert(ret != 0, "ReleaseSemaphore() failed"); + + thread->java_suspend_self(); + } + } while (threadIsSuspended); + } +} + +int os::signal_lookup() { + return check_pending_signals(false); +} + +int os::signal_wait() { + return check_pending_signals(true); +} + +// Implicit OS exception handling + +LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { + JavaThread* thread = JavaThread::current(); + // Save pc in thread +#ifdef _M_IA64 + thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP); + // Set pc to handler + exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; +#elif _M_AMD64 + thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip); + // Set pc to handler + exceptionInfo->ContextRecord->Rip = (DWORD64)handler; +#else + thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip); + // Set pc to handler + exceptionInfo->ContextRecord->Eip = (LONG)handler; +#endif + + // Continue the execution + return EXCEPTION_CONTINUE_EXECUTION; +} + + +// Used for PostMortemDump +extern "C" void safepoints(); +extern "C" void find(int x); +extern "C" void events(); + +// According to Windows API documentation, an illegal instruction sequence should generate +// the 0xC000001C exception code. However, real world experience shows that occasionnaly +// the execution of an illegal instruction can generate the exception code 0xC000001E. This +// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). + +#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E + +// From "Execution Protection in the Windows Operating System" draft 0.35 +// Once a system header becomes available, the "real" define should be +// included or copied here. +#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 + +#define def_excpt(val) #val, val + +struct siglabel { + char *name; + int number; +}; + +struct siglabel exceptlabels[] = { + def_excpt(EXCEPTION_ACCESS_VIOLATION), + def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), + def_excpt(EXCEPTION_BREAKPOINT), + def_excpt(EXCEPTION_SINGLE_STEP), + def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), + def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), + def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), + def_excpt(EXCEPTION_FLT_INEXACT_RESULT), + def_excpt(EXCEPTION_FLT_INVALID_OPERATION), + def_excpt(EXCEPTION_FLT_OVERFLOW), + def_excpt(EXCEPTION_FLT_STACK_CHECK), + def_excpt(EXCEPTION_FLT_UNDERFLOW), + def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), + def_excpt(EXCEPTION_INT_OVERFLOW), + def_excpt(EXCEPTION_PRIV_INSTRUCTION), + def_excpt(EXCEPTION_IN_PAGE_ERROR), + def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), + def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), + def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), + def_excpt(EXCEPTION_STACK_OVERFLOW), + def_excpt(EXCEPTION_INVALID_DISPOSITION), + def_excpt(EXCEPTION_GUARD_PAGE), + def_excpt(EXCEPTION_INVALID_HANDLE), + NULL, 0 +}; + +const char* os::exception_name(int exception_code, char *buf, size_t size) { + for (int i = 0; exceptlabels[i].name != NULL; i++) { + if (exceptlabels[i].number == exception_code) { + jio_snprintf(buf, size, "%s", exceptlabels[i].name); + return buf; + } + } + + return NULL; +} + +//----------------------------------------------------------------------------- +LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { + // handle exception caused by idiv; should only happen for -MinInt/-1 + // (division by zero is handled explicitly) +#ifdef _M_IA64 + assert(0, "Fix Handle_IDiv_Exception"); +#elif _M_AMD64 + PCONTEXT ctx = exceptionInfo->ContextRecord; + address pc = (address)ctx->Rip; + NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); + assert(pc[0] == 0xF7, "not an idiv opcode"); + assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); + assert(ctx->Rax == min_jint, "unexpected idiv exception"); + // set correct result values and continue after idiv instruction + ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes + ctx->Rax = (DWORD)min_jint; // result + ctx->Rdx = (DWORD)0; // remainder + // Continue the execution +#else + PCONTEXT ctx = exceptionInfo->ContextRecord; + address pc = (address)ctx->Eip; + NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); + assert(pc[0] == 0xF7, "not an idiv opcode"); + assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); + assert(ctx->Eax == min_jint, "unexpected idiv exception"); + // set correct result values and continue after idiv instruction + ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes + ctx->Eax = (DWORD)min_jint; // result + ctx->Edx = (DWORD)0; // remainder + // Continue the execution +#endif + return EXCEPTION_CONTINUE_EXECUTION; +} + +#ifndef _WIN64 +//----------------------------------------------------------------------------- +LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { + // handle exception caused by native mothod modifying control word + PCONTEXT ctx = exceptionInfo->ContextRecord; + DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; + + switch (exception_code) { + case EXCEPTION_FLT_DENORMAL_OPERAND: + case EXCEPTION_FLT_DIVIDE_BY_ZERO: + case EXCEPTION_FLT_INEXACT_RESULT: + case EXCEPTION_FLT_INVALID_OPERATION: + case EXCEPTION_FLT_OVERFLOW: + case EXCEPTION_FLT_STACK_CHECK: + case EXCEPTION_FLT_UNDERFLOW: + jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); + if (fp_control_word != ctx->FloatSave.ControlWord) { + // Restore FPCW and mask out FLT exceptions + ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; + // Mask out pending FLT exceptions + ctx->FloatSave.StatusWord &= 0xffffff00; + return EXCEPTION_CONTINUE_EXECUTION; + } + } + return EXCEPTION_CONTINUE_SEARCH; +} +#else //_WIN64 +/* + On Windows, the mxcsr control bits are non-volatile across calls + See also CR 6192333 + If EXCEPTION_FLT_* happened after some native method modified + mxcsr - it is not a jvm fault. + However should we decide to restore of mxcsr after a faulty + native method we can uncomment following code + jint MxCsr = INITIAL_MXCSR; + // we can't use StubRoutines::addr_mxcsr_std() + // because in Win64 mxcsr is not saved there + if (MxCsr != ctx->MxCsr) { + ctx->MxCsr = MxCsr; + return EXCEPTION_CONTINUE_EXECUTION; + } + +*/ +#endif //_WIN64 + + +// Fatal error reporting is single threaded so we can make this a +// static and preallocated. If it's more than MAX_PATH silently ignore +// it. +static char saved_error_file[MAX_PATH] = {0}; + +void os::set_error_file(const char *logfile) { + if (strlen(logfile) <= MAX_PATH) { + strncpy(saved_error_file, logfile, MAX_PATH); + } +} + +static inline void report_error(Thread* t, DWORD exception_code, + address addr, void* siginfo, void* context) { + VMError err(t, exception_code, addr, siginfo, context); + err.report_and_die(); + + // If UseOsErrorReporting, this will return here and save the error file + // somewhere where we can find it in the minidump. +} + +//----------------------------------------------------------------------------- +LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { + if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; + DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; +#ifdef _M_IA64 + address pc = (address) exceptionInfo->ContextRecord->StIIP; +#elif _M_AMD64 + address pc = (address) exceptionInfo->ContextRecord->Rip; +#else + address pc = (address) exceptionInfo->ContextRecord->Eip; +#endif + Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady + +#ifndef _WIN64 + // Execution protection violation - win32 running on AMD64 only + // Handled first to avoid misdiagnosis as a "normal" access violation; + // This is safe to do because we have a new/unique ExceptionInformation + // code for this condition. + if (exception_code == EXCEPTION_ACCESS_VIOLATION) { + PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; + int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; + address addr = (address) exceptionRecord->ExceptionInformation[1]; + + if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { + int page_size = os::vm_page_size(); + + // Make sure the pc and the faulting address are sane. + // + // If an instruction spans a page boundary, and the page containing + // the beginning of the instruction is executable but the following + // page is not, the pc and the faulting address might be slightly + // different - we still want to unguard the 2nd page in this case. + // + // 15 bytes seems to be a (very) safe value for max instruction size. + bool pc_is_near_addr = + (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); + bool instr_spans_page_boundary = + (align_size_down((intptr_t) pc ^ (intptr_t) addr, + (intptr_t) page_size) > 0); + + if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { + static volatile address last_addr = + (address) os::non_memory_address_word(); + + // In conservative mode, don't unguard unless the address is in the VM + if (UnguardOnExecutionViolation > 0 && addr != last_addr && + (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { + + // Unguard and retry + address page_start = + (address) align_size_down((intptr_t) addr, (intptr_t) page_size); + bool res = os::unguard_memory((char*) page_start, page_size); + + if (PrintMiscellaneous && Verbose) { + char buf[256]; + jio_snprintf(buf, sizeof(buf), "Execution protection violation " + "at " INTPTR_FORMAT + ", unguarding " INTPTR_FORMAT ": %s", addr, + page_start, (res ? "success" : strerror(errno))); + tty->print_raw_cr(buf); + } + + // Set last_addr so if we fault again at the same address, we don't + // end up in an endless loop. + // + // There are two potential complications here. Two threads trapping + // at the same address at the same time could cause one of the + // threads to think it already unguarded, and abort the VM. Likely + // very rare. + // + // The other race involves two threads alternately trapping at + // different addresses and failing to unguard the page, resulting in + // an endless loop. This condition is probably even more unlikely + // than the first. + // + // Although both cases could be avoided by using locks or thread + // local last_addr, these solutions are unnecessary complication: + // this handler is a best-effort safety net, not a complete solution. + // It is disabled by default and should only be used as a workaround + // in case we missed any no-execute-unsafe VM code. + + last_addr = addr; + + return EXCEPTION_CONTINUE_EXECUTION; + } + } + + // Last unguard failed or not unguarding + tty->print_raw_cr("Execution protection violation"); + report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, + exceptionInfo->ContextRecord); + return EXCEPTION_CONTINUE_SEARCH; + } + } +#endif // _WIN64 + + // Check to see if we caught the safepoint code in the + // process of write protecting the memory serialization page. + // It write enables the page immediately after protecting it + // so just return. + if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { + JavaThread* thread = (JavaThread*) t; + PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; + address addr = (address) exceptionRecord->ExceptionInformation[1]; + if ( os::is_memory_serialize_page(thread, addr) ) { + // Block current thread until the memory serialize page permission restored. + os::block_on_serialize_page_trap(); + return EXCEPTION_CONTINUE_EXECUTION; + } + } + + + if (t != NULL && t->is_Java_thread()) { + JavaThread* thread = (JavaThread*) t; + bool in_java = thread->thread_state() == _thread_in_Java; + + // Handle potential stack overflows up front. + if (exception_code == EXCEPTION_STACK_OVERFLOW) { + if (os::uses_stack_guard_pages()) { +#ifdef _M_IA64 + // + // If it's a legal stack address continue, Windows will map it in. + // + PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; + address addr = (address) exceptionRecord->ExceptionInformation[1]; + if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) + return EXCEPTION_CONTINUE_EXECUTION; + + // The register save area is the same size as the memory stack + // and starts at the page just above the start of the memory stack. + // If we get a fault in this area, we've run out of register + // stack. If we are in java, try throwing a stack overflow exception. + if (addr > thread->stack_base() && + addr <= (thread->stack_base()+thread->stack_size()) ) { + char buf[256]; + jio_snprintf(buf, sizeof(buf), + "Register stack overflow, addr:%p, stack_base:%p\n", + addr, thread->stack_base() ); + tty->print_raw_cr(buf); + // If not in java code, return and hope for the best. + return in_java ? Handle_Exception(exceptionInfo, + SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) + : EXCEPTION_CONTINUE_EXECUTION; + } +#endif + if (thread->stack_yellow_zone_enabled()) { + // Yellow zone violation. The o/s has unprotected the first yellow + // zone page for us. Note: must call disable_stack_yellow_zone to + // update the enabled status, even if the zone contains only one page. + thread->disable_stack_yellow_zone(); + // If not in java code, return and hope for the best. + return in_java ? Handle_Exception(exceptionInfo, + SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) + : EXCEPTION_CONTINUE_EXECUTION; + } else { + // Fatal red zone violation. + thread->disable_stack_red_zone(); + tty->print_raw_cr("An unrecoverable stack overflow has occurred."); + report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, + exceptionInfo->ContextRecord); + return EXCEPTION_CONTINUE_SEARCH; + } + } else if (in_java) { + // JVM-managed guard pages cannot be used on win95/98. The o/s provides + // a one-time-only guard page, which it has released to us. The next + // stack overflow on this thread will result in an ACCESS_VIOLATION. + return Handle_Exception(exceptionInfo, + SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); + } else { + // Can only return and hope for the best. Further stack growth will + // result in an ACCESS_VIOLATION. + return EXCEPTION_CONTINUE_EXECUTION; + } + } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { + // Either stack overflow or null pointer exception. + if (in_java) { + PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; + address addr = (address) exceptionRecord->ExceptionInformation[1]; + address stack_end = thread->stack_base() - thread->stack_size(); + if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { + // Stack overflow. + assert(!os::uses_stack_guard_pages(), + "should be caught by red zone code above."); + return Handle_Exception(exceptionInfo, + SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); + } + // + // Check for safepoint polling and implicit null + // We only expect null pointers in the stubs (vtable) + // the rest are checked explicitly now. + // + CodeBlob* cb = CodeCache::find_blob(pc); + if (cb != NULL) { + if (os::is_poll_address(addr)) { + address stub = SharedRuntime::get_poll_stub(pc); + return Handle_Exception(exceptionInfo, stub); + } + } + { +#ifdef _WIN64 + // + // If it's a legal stack address map the entire region in + // + PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; + address addr = (address) exceptionRecord->ExceptionInformation[1]; + if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) { + addr = (address)((uintptr_t)addr & + (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); + os::commit_memory( (char *)addr, thread->stack_base() - addr ); + return EXCEPTION_CONTINUE_EXECUTION; + } + else +#endif + { + // Null pointer exception. +#ifdef _M_IA64 + // We catch register stack overflows in compiled code by doing + // an explicit compare and executing a st8(G0, G0) if the + // BSP enters into our guard area. We test for the overflow + // condition and fall into the normal null pointer exception + // code if BSP hasn't overflowed. + if ( in_java ) { + if(thread->register_stack_overflow()) { + assert((address)exceptionInfo->ContextRecord->IntS3 == + thread->register_stack_limit(), + "GR7 doesn't contain register_stack_limit"); + // Disable the yellow zone which sets the state that + // we've got a stack overflow problem. + if (thread->stack_yellow_zone_enabled()) { + thread->disable_stack_yellow_zone(); + } + // Give us some room to process the exception + thread->disable_register_stack_guard(); + // Update GR7 with the new limit so we can continue running + // compiled code. + exceptionInfo->ContextRecord->IntS3 = + (ULONGLONG)thread->register_stack_limit(); + return Handle_Exception(exceptionInfo, + SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); + } else { + // + // Check for implicit null + // We only expect null pointers in the stubs (vtable) + // the rest are checked explicitly now. + // + CodeBlob* cb = CodeCache::find_blob(pc); + if (cb != NULL) { + if (VtableStubs::stub_containing(pc) != NULL) { + if (((uintptr_t)addr) < os::vm_page_size() ) { + // an access to the first page of VM--assume it is a null pointer + return Handle_Exception(exceptionInfo, + SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL)); + } + } + } + } + } // in_java + + // IA64 doesn't use implicit null checking yet. So we shouldn't + // get here. + tty->print_raw_cr("Access violation, possible null pointer exception"); + report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, + exceptionInfo->ContextRecord); + return EXCEPTION_CONTINUE_SEARCH; +#else /* !IA64 */ + + // Windows 98 reports faulting addresses incorrectly + if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || + !os::win32::is_nt()) { + return Handle_Exception(exceptionInfo, + SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL)); + } + report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, + exceptionInfo->ContextRecord); + return EXCEPTION_CONTINUE_SEARCH; +#endif + } + } + } + +#ifdef _WIN64 + // Special care for fast JNI field accessors. + // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks + // in and the heap gets shrunk before the field access. + if (exception_code == EXCEPTION_ACCESS_VIOLATION) { + address addr = JNI_FastGetField::find_slowcase_pc(pc); + if (addr != (address)-1) { + return Handle_Exception(exceptionInfo, addr); + } + } +#endif + +#ifdef _WIN64 + // Windows will sometimes generate an access violation + // when we call malloc. Since we use VectoredExceptions + // on 64 bit platforms, we see this exception. We must + // pass this exception on so Windows can recover. + // We check to see if the pc of the fault is in NTDLL.DLL + // if so, we pass control on to Windows for handling. + if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH; +#endif + + // Stack overflow or null pointer exception in native code. + report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, + exceptionInfo->ContextRecord); + return EXCEPTION_CONTINUE_SEARCH; + } + + if (in_java) { + switch (exception_code) { + case EXCEPTION_INT_DIVIDE_BY_ZERO: + return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); + + case EXCEPTION_INT_OVERFLOW: + return Handle_IDiv_Exception(exceptionInfo); + + } // switch + } +#ifndef _WIN64 + if ((thread->thread_state() == _thread_in_Java) || + (thread->thread_state() == _thread_in_native) ) + { + LONG result=Handle_FLT_Exception(exceptionInfo); + if (result==EXCEPTION_CONTINUE_EXECUTION) return result; + } +#endif //_WIN64 + } + + if (exception_code != EXCEPTION_BREAKPOINT) { +#ifndef _WIN64 + report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, + exceptionInfo->ContextRecord); +#else + // Itanium Windows uses a VectoredExceptionHandler + // Which means that C++ programatic exception handlers (try/except) + // will get here. Continue the search for the right except block if + // the exception code is not a fatal code. + switch ( exception_code ) { + case EXCEPTION_ACCESS_VIOLATION: + case EXCEPTION_STACK_OVERFLOW: + case EXCEPTION_ILLEGAL_INSTRUCTION: + case EXCEPTION_ILLEGAL_INSTRUCTION_2: + case EXCEPTION_INT_OVERFLOW: + case EXCEPTION_INT_DIVIDE_BY_ZERO: + { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, + exceptionInfo->ContextRecord); + } + break; + default: + break; + } +#endif + } + return EXCEPTION_CONTINUE_SEARCH; +} + +#ifndef _WIN64 +// Special care for fast JNI accessors. +// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and +// the heap gets shrunk before the field access. +// Need to install our own structured exception handler since native code may +// install its own. +LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { + DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; + if (exception_code == EXCEPTION_ACCESS_VIOLATION) { + address pc = (address) exceptionInfo->ContextRecord->Eip; + address addr = JNI_FastGetField::find_slowcase_pc(pc); + if (addr != (address)-1) { + return Handle_Exception(exceptionInfo, addr); + } + } + return EXCEPTION_CONTINUE_SEARCH; +} + +#define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ +Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ + __try { \ + return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ + } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ + } \ + return 0; \ +} + +DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) +DEFINE_FAST_GETFIELD(jbyte, byte, Byte) +DEFINE_FAST_GETFIELD(jchar, char, Char) +DEFINE_FAST_GETFIELD(jshort, short, Short) +DEFINE_FAST_GETFIELD(jint, int, Int) +DEFINE_FAST_GETFIELD(jlong, long, Long) +DEFINE_FAST_GETFIELD(jfloat, float, Float) +DEFINE_FAST_GETFIELD(jdouble, double, Double) + +address os::win32::fast_jni_accessor_wrapper(BasicType type) { + switch (type) { + case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; + case T_BYTE: return (address)jni_fast_GetByteField_wrapper; + case T_CHAR: return (address)jni_fast_GetCharField_wrapper; + case T_SHORT: return (address)jni_fast_GetShortField_wrapper; + case T_INT: return (address)jni_fast_GetIntField_wrapper; + case T_LONG: return (address)jni_fast_GetLongField_wrapper; + case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; + case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; + default: ShouldNotReachHere(); + } + return (address)-1; +} +#endif + +// Virtual Memory + +int os::vm_page_size() { return os::win32::vm_page_size(); } +int os::vm_allocation_granularity() { + return os::win32::vm_allocation_granularity(); +} + +// Windows large page support is available on Windows 2003. In order to use +// large page memory, the administrator must first assign additional privilege +// to the user: +// + select Control Panel -> Administrative Tools -> Local Security Policy +// + select Local Policies -> User Rights Assignment +// + double click "Lock pages in memory", add users and/or groups +// + reboot +// Note the above steps are needed for administrator as well, as administrators +// by default do not have the privilege to lock pages in memory. +// +// Note about Windows 2003: although the API supports committing large page +// memory on a page-by-page basis and VirtualAlloc() returns success under this +// scenario, I found through experiment it only uses large page if the entire +// memory region is reserved and committed in a single VirtualAlloc() call. +// This makes Windows large page support more or less like Solaris ISM, in +// that the entire heap must be committed upfront. This probably will change +// in the future, if so the code below needs to be revisited. + +#ifndef MEM_LARGE_PAGES +#define MEM_LARGE_PAGES 0x20000000 +#endif + +// GetLargePageMinimum is only available on Windows 2003. The other functions +// are available on NT but not on Windows 98/Me. We have to resolve them at +// runtime. +typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void); +typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type) + (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); +typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE); +typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID); + +static GetLargePageMinimum_func_type _GetLargePageMinimum; +static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges; +static OpenProcessToken_func_type _OpenProcessToken; +static LookupPrivilegeValue_func_type _LookupPrivilegeValue; + +static HINSTANCE _kernel32; +static HINSTANCE _advapi32; +static HANDLE _hProcess; +static HANDLE _hToken; + +static size_t _large_page_size = 0; + +static bool resolve_functions_for_large_page_init() { + _kernel32 = LoadLibrary("kernel32.dll"); + if (_kernel32 == NULL) return false; + + _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type, + GetProcAddress(_kernel32, "GetLargePageMinimum")); + if (_GetLargePageMinimum == NULL) return false; + + _advapi32 = LoadLibrary("advapi32.dll"); + if (_advapi32 == NULL) return false; + + _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type, + GetProcAddress(_advapi32, "AdjustTokenPrivileges")); + _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type, + GetProcAddress(_advapi32, "OpenProcessToken")); + _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type, + GetProcAddress(_advapi32, "LookupPrivilegeValueA")); + return _AdjustTokenPrivileges != NULL && + _OpenProcessToken != NULL && + _LookupPrivilegeValue != NULL; +} + +static bool request_lock_memory_privilege() { + _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, + os::current_process_id()); + + LUID luid; + if (_hProcess != NULL && + _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && + _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { + + TOKEN_PRIVILEGES tp; + tp.PrivilegeCount = 1; + tp.Privileges[0].Luid = luid; + tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; + + // AdjustTokenPrivileges() may return TRUE even when it couldn't change the + // privilege. Check GetLastError() too. See MSDN document. + if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && + (GetLastError() == ERROR_SUCCESS)) { + return true; + } + } + + return false; +} + +static void cleanup_after_large_page_init() { + _GetLargePageMinimum = NULL; + _AdjustTokenPrivileges = NULL; + _OpenProcessToken = NULL; + _LookupPrivilegeValue = NULL; + if (_kernel32) FreeLibrary(_kernel32); + _kernel32 = NULL; + if (_advapi32) FreeLibrary(_advapi32); + _advapi32 = NULL; + if (_hProcess) CloseHandle(_hProcess); + _hProcess = NULL; + if (_hToken) CloseHandle(_hToken); + _hToken = NULL; +} + +bool os::large_page_init() { + if (!UseLargePages) return false; + + // print a warning if any large page related flag is specified on command line + bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || + !FLAG_IS_DEFAULT(LargePageSizeInBytes); + bool success = false; + +# define WARN(msg) if (warn_on_failure) { warning(msg); } + if (resolve_functions_for_large_page_init()) { + if (request_lock_memory_privilege()) { + size_t s = _GetLargePageMinimum(); + if (s) { +#if defined(IA32) || defined(AMD64) + if (s > 4*M || LargePageSizeInBytes > 4*M) { + WARN("JVM cannot use large pages bigger than 4mb."); + } else { +#endif + if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { + _large_page_size = LargePageSizeInBytes; + } else { + _large_page_size = s; + } + success = true; +#if defined(IA32) || defined(AMD64) + } +#endif + } else { + WARN("Large page is not supported by the processor."); + } + } else { + WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); + } + } else { + WARN("Large page is not supported by the operating system."); + } +#undef WARN + + const size_t default_page_size = (size_t) vm_page_size(); + if (success && _large_page_size > default_page_size) { + _page_sizes[0] = _large_page_size; + _page_sizes[1] = default_page_size; + _page_sizes[2] = 0; + } + + cleanup_after_large_page_init(); + return success; +} + +// On win32, one cannot release just a part of reserved memory, it's an +// all or nothing deal. When we split a reservation, we must break the +// reservation into two reservations. +void os::split_reserved_memory(char *base, size_t size, size_t split, + bool realloc) { + if (size > 0) { + release_memory(base, size); + if (realloc) { + reserve_memory(split, base); + } + if (size != split) { + reserve_memory(size - split, base + split); + } + } +} + +char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { + assert((size_t)addr % os::vm_allocation_granularity() == 0, + "reserve alignment"); + assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); + char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, + PAGE_EXECUTE_READWRITE); + assert(res == NULL || addr == NULL || addr == res, + "Unexpected address from reserve."); + return res; +} + +// Reserve memory at an arbitrary address, only if that area is +// available (and not reserved for something else). +char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { + // Windows os::reserve_memory() fails of the requested address range is + // not avilable. + return reserve_memory(bytes, requested_addr); +} + +size_t os::large_page_size() { + return _large_page_size; +} + +bool os::can_commit_large_page_memory() { + // Windows only uses large page memory when the entire region is reserved + // and committed in a single VirtualAlloc() call. This may change in the + // future, but with Windows 2003 it's not possible to commit on demand. + return false; +} + +char* os::reserve_memory_special(size_t bytes) { + DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; + char * res = (char *)VirtualAlloc(NULL, bytes, flag, PAGE_READWRITE); + return res; +} + +bool os::release_memory_special(char* base, size_t bytes) { + return release_memory(base, bytes); +} + +void os::print_statistics() { +} + +bool os::commit_memory(char* addr, size_t bytes) { + if (bytes == 0) { + // Don't bother the OS with noops. + return true; + } + assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); + assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); + // Don't attempt to print anything if the OS call fails. We're + // probably low on resources, so the print itself may cause crashes. + return VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE) != NULL; +} + +bool os::commit_memory(char* addr, size_t size, size_t alignment_hint) { + return commit_memory(addr, size); +} + +bool os::uncommit_memory(char* addr, size_t bytes) { + if (bytes == 0) { + // Don't bother the OS with noops. + return true; + } + assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); + assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); + return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0; +} + +bool os::release_memory(char* addr, size_t bytes) { + return VirtualFree(addr, 0, MEM_RELEASE) != 0; +} + +bool os::protect_memory(char* addr, size_t bytes) { + DWORD old_status; + return VirtualProtect(addr, bytes, PAGE_READONLY, &old_status) != 0; +} + +bool os::guard_memory(char* addr, size_t bytes) { + DWORD old_status; + return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_status) != 0; +} + +bool os::unguard_memory(char* addr, size_t bytes) { + DWORD old_status; + return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &old_status) != 0; +} + +void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } +void os::free_memory(char *addr, size_t bytes) { } +void os::numa_make_global(char *addr, size_t bytes) { } +void os::numa_make_local(char *addr, size_t bytes) { } +bool os::numa_topology_changed() { return false; } +size_t os::numa_get_groups_num() { return 1; } +int os::numa_get_group_id() { return 0; } +size_t os::numa_get_leaf_groups(int *ids, size_t size) { + if (size > 0) { + ids[0] = 0; + return 1; + } + return 0; +} + +bool os::get_page_info(char *start, page_info* info) { + return false; +} + +char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { + return end; +} + +char* os::non_memory_address_word() { + // Must never look like an address returned by reserve_memory, + // even in its subfields (as defined by the CPU immediate fields, + // if the CPU splits constants across multiple instructions). + return (char*)-1; +} + +#define MAX_ERROR_COUNT 100 +#define SYS_THREAD_ERROR 0xffffffffUL + +void os::pd_start_thread(Thread* thread) { + DWORD ret = ResumeThread(thread->osthread()->thread_handle()); + // Returns previous suspend state: + // 0: Thread was not suspended + // 1: Thread is running now + // >1: Thread is still suspended. + assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back +} + +size_t os::read(int fd, void *buf, unsigned int nBytes) { + return ::read(fd, buf, nBytes); +} + +class HighResolutionInterval { + // The default timer resolution seems to be 10 milliseconds. + // (Where is this written down?) + // If someone wants to sleep for only a fraction of the default, + // then we set the timer resolution down to 1 millisecond for + // the duration of their interval. + // We carefully set the resolution back, since otherwise we + // seem to incur an overhead (3%?) that we don't need. + // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. + // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). + // Alternatively, we could compute the relative error (503/500 = .6%) and only use + // timeBeginPeriod() if the relative error exceeded some threshold. + // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and + // to decreased efficiency related to increased timer "tick" rates. We want to minimize + // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high + // resolution timers running. +private: + jlong resolution; +public: + HighResolutionInterval(jlong ms) { + resolution = ms % 10L; + if (resolution != 0) { + MMRESULT result = timeBeginPeriod(1L); + } + } + ~HighResolutionInterval() { + if (resolution != 0) { + MMRESULT result = timeEndPeriod(1L); + } + resolution = 0L; + } +}; + +int os::sleep(Thread* thread, jlong ms, bool interruptable) { + jlong limit = (jlong) MAXDWORD; + + while(ms > limit) { + int res; + if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) + return res; + ms -= limit; + } + + assert(thread == Thread::current(), "thread consistency check"); + OSThread* osthread = thread->osthread(); + OSThreadWaitState osts(osthread, false /* not Object.wait() */); + int result; + if (interruptable) { + assert(thread->is_Java_thread(), "must be java thread"); + JavaThread *jt = (JavaThread *) thread; + ThreadBlockInVM tbivm(jt); + + jt->set_suspend_equivalent(); + // cleared by handle_special_suspend_equivalent_condition() or + // java_suspend_self() via check_and_wait_while_suspended() + + HANDLE events[1]; + events[0] = osthread->interrupt_event(); + HighResolutionInterval *phri=NULL; + if(!ForceTimeHighResolution) + phri = new HighResolutionInterval( ms ); + if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { + result = OS_TIMEOUT; + } else { + ResetEvent(osthread->interrupt_event()); + osthread->set_interrupted(false); + result = OS_INTRPT; + } + delete phri; //if it is NULL, harmless + + // were we externally suspended while we were waiting? + jt->check_and_wait_while_suspended(); + } else { + assert(!thread->is_Java_thread(), "must not be java thread"); + Sleep((long) ms); + result = OS_TIMEOUT; + } + return result; +} + +// Sleep forever; naked call to OS-specific sleep; use with CAUTION +void os::infinite_sleep() { + while (true) { // sleep forever ... + Sleep(100000); // ... 100 seconds at a time + } +} + +typedef BOOL (WINAPI * STTSignature)(void) ; + +os::YieldResult os::NakedYield() { + // Use either SwitchToThread() or Sleep(0) + // Consider passing back the return value from SwitchToThread(). + // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread. + // In that case we revert to Sleep(0). + static volatile STTSignature stt = (STTSignature) 1 ; + + if (stt == ((STTSignature) 1)) { + stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ; + // It's OK if threads race during initialization as the operation above is idempotent. + } + if (stt != NULL) { + return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ; + } else { + Sleep (0) ; + } + return os::YIELD_UNKNOWN ; +} + +void os::yield() { os::NakedYield(); } + +void os::yield_all(int attempts) { + // Yields to all threads, including threads with lower priorities + Sleep(1); +} + +// Win32 only gives you access to seven real priorities at a time, +// so we compress Java's ten down to seven. It would be better +// if we dynamically adjusted relative priorities. + +int os::java_to_os_priority[MaxPriority + 1] = { + THREAD_PRIORITY_IDLE, // 0 Entry should never be used + THREAD_PRIORITY_LOWEST, // 1 MinPriority + THREAD_PRIORITY_LOWEST, // 2 + THREAD_PRIORITY_BELOW_NORMAL, // 3 + THREAD_PRIORITY_BELOW_NORMAL, // 4 + THREAD_PRIORITY_NORMAL, // 5 NormPriority + THREAD_PRIORITY_NORMAL, // 6 + THREAD_PRIORITY_ABOVE_NORMAL, // 7 + THREAD_PRIORITY_ABOVE_NORMAL, // 8 + THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority + THREAD_PRIORITY_HIGHEST // 10 MaxPriority +}; + +int prio_policy1[MaxPriority + 1] = { + THREAD_PRIORITY_IDLE, // 0 Entry should never be used + THREAD_PRIORITY_LOWEST, // 1 MinPriority + THREAD_PRIORITY_LOWEST, // 2 + THREAD_PRIORITY_BELOW_NORMAL, // 3 + THREAD_PRIORITY_BELOW_NORMAL, // 4 + THREAD_PRIORITY_NORMAL, // 5 NormPriority + THREAD_PRIORITY_ABOVE_NORMAL, // 6 + THREAD_PRIORITY_ABOVE_NORMAL, // 7 + THREAD_PRIORITY_HIGHEST, // 8 + THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority + THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority +}; + +static int prio_init() { + // If ThreadPriorityPolicy is 1, switch tables + if (ThreadPriorityPolicy == 1) { + int i; + for (i = 0; i < MaxPriority + 1; i++) { + os::java_to_os_priority[i] = prio_policy1[i]; + } + } + return 0; +} + +OSReturn os::set_native_priority(Thread* thread, int priority) { + if (!UseThreadPriorities) return OS_OK; + bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; + return ret ? OS_OK : OS_ERR; +} + +OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { + if ( !UseThreadPriorities ) { + *priority_ptr = java_to_os_priority[NormPriority]; + return OS_OK; + } + int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); + if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { + assert(false, "GetThreadPriority failed"); + return OS_ERR; + } + *priority_ptr = os_prio; + return OS_OK; +} + + +// Hint to the underlying OS that a task switch would not be good. +// Void return because it's a hint and can fail. +void os::hint_no_preempt() {} + +void os::interrupt(Thread* thread) { + assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), + "possibility of dangling Thread pointer"); + + OSThread* osthread = thread->osthread(); + osthread->set_interrupted(true); + // More than one thread can get here with the same value of osthread, + // resulting in multiple notifications. We do, however, want the store + // to interrupted() to be visible to other threads before we post + // the interrupt event. + OrderAccess::release(); + SetEvent(osthread->interrupt_event()); + // For JSR166: unpark after setting status + if (thread->is_Java_thread()) + ((JavaThread*)thread)->parker()->unpark(); + + ParkEvent * ev = thread->_ParkEvent ; + if (ev != NULL) ev->unpark() ; + +} + + +bool os::is_interrupted(Thread* thread, bool clear_interrupted) { + assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), + "possibility of dangling Thread pointer"); + + OSThread* osthread = thread->osthread(); + bool interrupted; + interrupted = osthread->interrupted(); + if (clear_interrupted == true) { + osthread->set_interrupted(false); + ResetEvent(osthread->interrupt_event()); + } // Otherwise leave the interrupted state alone + + return interrupted; +} + +// Get's a pc (hint) for a running thread. Currently used only for profiling. +ExtendedPC os::get_thread_pc(Thread* thread) { + CONTEXT context; + context.ContextFlags = CONTEXT_CONTROL; + HANDLE handle = thread->osthread()->thread_handle(); +#ifdef _M_IA64 + assert(0, "Fix get_thread_pc"); + return ExtendedPC(NULL); +#else + if (GetThreadContext(handle, &context)) { +#ifdef _M_AMD64 + return ExtendedPC((address) context.Rip); +#else + return ExtendedPC((address) context.Eip); +#endif + } else { + return ExtendedPC(NULL); + } +#endif +} + +// GetCurrentThreadId() returns DWORD +intx os::current_thread_id() { return GetCurrentThreadId(); } + +static int _initial_pid = 0; + +int os::current_process_id() +{ + return (_initial_pid ? _initial_pid : _getpid()); +} + +int os::win32::_vm_page_size = 0; +int os::win32::_vm_allocation_granularity = 0; +int os::win32::_processor_type = 0; +// Processor level is not available on non-NT systems, use vm_version instead +int os::win32::_processor_level = 0; +julong os::win32::_physical_memory = 0; +size_t os::win32::_default_stack_size = 0; + + intx os::win32::_os_thread_limit = 0; +volatile intx os::win32::_os_thread_count = 0; + +bool os::win32::_is_nt = false; + + +void os::win32::initialize_system_info() { + SYSTEM_INFO si; + GetSystemInfo(&si); + _vm_page_size = si.dwPageSize; + _vm_allocation_granularity = si.dwAllocationGranularity; + _processor_type = si.dwProcessorType; + _processor_level = si.wProcessorLevel; + _processor_count = si.dwNumberOfProcessors; + + MEMORYSTATUS ms; + // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, + // dwMemoryLoad (% of memory in use) + GlobalMemoryStatus(&ms); + _physical_memory = ms.dwTotalPhys; + + OSVERSIONINFO oi; + oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); + GetVersionEx(&oi); + switch(oi.dwPlatformId) { + case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; + case VER_PLATFORM_WIN32_NT: _is_nt = true; break; + default: fatal("Unknown platform"); + } + + _default_stack_size = os::current_stack_size(); + assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); + assert((_default_stack_size & (_vm_page_size - 1)) == 0, + "stack size not a multiple of page size"); + + initialize_performance_counter(); + + // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is + // known to deadlock the system, if the VM issues to thread operations with + // a too high frequency, e.g., such as changing the priorities. + // The 6000 seems to work well - no deadlocks has been notices on the test + // programs that we have seen experience this problem. + if (!os::win32::is_nt()) { + StarvationMonitorInterval = 6000; + } +} + + +void os::win32::setmode_streams() { + _setmode(_fileno(stdin), _O_BINARY); + _setmode(_fileno(stdout), _O_BINARY); + _setmode(_fileno(stderr), _O_BINARY); +} + + +int os::message_box(const char* title, const char* message) { + int result = MessageBox(NULL, message, title, + MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); + return result == IDYES; +} + +int os::allocate_thread_local_storage() { + return TlsAlloc(); +} + + +void os::free_thread_local_storage(int index) { + TlsFree(index); +} + + +void os::thread_local_storage_at_put(int index, void* value) { + TlsSetValue(index, value); + assert(thread_local_storage_at(index) == value, "Just checking"); +} + + +void* os::thread_local_storage_at(int index) { + return TlsGetValue(index); +} + + +#ifndef PRODUCT +#ifndef _WIN64 +// Helpers to check whether NX protection is enabled +int nx_exception_filter(_EXCEPTION_POINTERS *pex) { + if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && + pex->ExceptionRecord->NumberParameters > 0 && + pex->ExceptionRecord->ExceptionInformation[0] == + EXCEPTION_INFO_EXEC_VIOLATION) { + return EXCEPTION_EXECUTE_HANDLER; + } + return EXCEPTION_CONTINUE_SEARCH; +} + +void nx_check_protection() { + // If NX is enabled we'll get an exception calling into code on the stack + char code[] = { (char)0xC3 }; // ret + void *code_ptr = (void *)code; + __try { + __asm call code_ptr + } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { + tty->print_raw_cr("NX protection detected."); + } +} +#endif // _WIN64 +#endif // PRODUCT + +// this is called _before_ the global arguments have been parsed +void os::init(void) { + _initial_pid = _getpid(); + + init_random(1234567); + + win32::initialize_system_info(); + win32::setmode_streams(); + init_page_sizes((size_t) win32::vm_page_size()); + + // For better scalability on MP systems (must be called after initialize_system_info) +#ifndef PRODUCT + if (is_MP()) { + NoYieldsInMicrolock = true; + } +#endif + // Initialize main_process and main_thread + main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle + if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, + &main_thread, THREAD_ALL_ACCESS, false, 0)) { + fatal("DuplicateHandle failed\n"); + } + main_thread_id = (int) GetCurrentThreadId(); +} + +// To install functions for atexit processing +extern "C" { + static void perfMemory_exit_helper() { + perfMemory_exit(); + } +} + + +// this is called _after_ the global arguments have been parsed +jint os::init_2(void) { + // Allocate a single page and mark it as readable for safepoint polling + address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); + guarantee( polling_page != NULL, "Reserve Failed for polling page"); + + address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); + guarantee( return_page != NULL, "Commit Failed for polling page"); + + os::set_polling_page( polling_page ); + +#ifndef PRODUCT + if( Verbose && PrintMiscellaneous ) + tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); +#endif + + if (!UseMembar) { + address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_EXECUTE_READWRITE); + guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); + + return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_EXECUTE_READWRITE); + guarantee( return_page != NULL, "Commit Failed for memory serialize page"); + + os::set_memory_serialize_page( mem_serialize_page ); + +#ifndef PRODUCT + if(Verbose && PrintMiscellaneous) + tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); +#endif +} + + FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); + + // Setup Windows Exceptions + + // On Itanium systems, Structured Exception Handling does not + // work since stack frames must be walkable by the OS. Since + // much of our code is dynamically generated, and we do not have + // proper unwind .xdata sections, the system simply exits + // rather than delivering the exception. To work around + // this we use VectorExceptions instead. +#ifdef _WIN64 + if (UseVectoredExceptions) { + topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter); + } +#endif + + // for debugging float code generation bugs + if (ForceFloatExceptions) { +#ifndef _WIN64 + static long fp_control_word = 0; + __asm { fstcw fp_control_word } + // see Intel PPro Manual, Vol. 2, p 7-16 + const long precision = 0x20; + const long underflow = 0x10; + const long overflow = 0x08; + const long zero_div = 0x04; + const long denorm = 0x02; + const long invalid = 0x01; + fp_control_word |= invalid; + __asm { fldcw fp_control_word } +#endif + } + + // Initialize HPI. + jint hpi_result = hpi::initialize(); + if (hpi_result != JNI_OK) { return hpi_result; } + + // If stack_commit_size is 0, windows will reserve the default size, + // but only commit a small portion of it. + size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); + size_t default_reserve_size = os::win32::default_stack_size(); + size_t actual_reserve_size = stack_commit_size; + if (stack_commit_size < default_reserve_size) { + // If stack_commit_size == 0, we want this too + actual_reserve_size = default_reserve_size; + } + + JavaThread::set_stack_size_at_create(stack_commit_size); + + // Calculate theoretical max. size of Threads to guard gainst artifical + // out-of-memory situations, where all available address-space has been + // reserved by thread stacks. + assert(actual_reserve_size != 0, "Must have a stack"); + + // Calculate the thread limit when we should start doing Virtual Memory + // banging. Currently when the threads will have used all but 200Mb of space. + // + // TODO: consider performing a similar calculation for commit size instead + // as reserve size, since on a 64-bit platform we'll run into that more + // often than running out of virtual memory space. We can use the + // lower value of the two calculations as the os_thread_limit. + size_t max_address_space = ((size_t)1 << (BitsPerOop - 1)) - (200 * K * K); + win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); + + // at exit methods are called in the reverse order of their registration. + // there is no limit to the number of functions registered. atexit does + // not set errno. + + if (PerfAllowAtExitRegistration) { + // only register atexit functions if PerfAllowAtExitRegistration is set. + // atexit functions can be delayed until process exit time, which + // can be problematic for embedded VM situations. Embedded VMs should + // call DestroyJavaVM() to assure that VM resources are released. + + // note: perfMemory_exit_helper atexit function may be removed in + // the future if the appropriate cleanup code can be added to the + // VM_Exit VMOperation's doit method. + if (atexit(perfMemory_exit_helper) != 0) { + warning("os::init_2 atexit(perfMemory_exit_helper) failed"); + } + } + + // initialize PSAPI or ToolHelp for fatal error handler + if (win32::is_nt()) _init_psapi(); + else _init_toolhelp(); + +#ifndef _WIN64 + // Print something if NX is enabled (win32 on AMD64) + NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); +#endif + + // initialize thread priority policy + prio_init(); + + return JNI_OK; +} + + +// Mark the polling page as unreadable +void os::make_polling_page_unreadable(void) { + DWORD old_status; + if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) ) + fatal("Could not disable polling page"); +}; + +// Mark the polling page as readable +void os::make_polling_page_readable(void) { + DWORD old_status; + if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) ) + fatal("Could not enable polling page"); +}; + + +int os::stat(const char *path, struct stat *sbuf) { + char pathbuf[MAX_PATH]; + if (strlen(path) > MAX_PATH - 1) { + errno = ENAMETOOLONG; + return -1; + } + hpi::native_path(strcpy(pathbuf, path)); + int ret = ::stat(pathbuf, sbuf); + if (sbuf != NULL && UseUTCFileTimestamp) { + // Fix for 6539723. st_mtime returned from stat() is dependent on + // the system timezone and so can return different values for the + // same file if/when daylight savings time changes. This adjustment + // makes sure the same timestamp is returned regardless of the TZ. + // + // See: + // http://msdn.microsoft.com/library/ + // default.asp?url=/library/en-us/sysinfo/base/ + // time_zone_information_str.asp + // and + // http://msdn.microsoft.com/library/default.asp?url= + // /library/en-us/sysinfo/base/settimezoneinformation.asp + // + // NOTE: there is a insidious bug here: If the timezone is changed + // after the call to stat() but before 'GetTimeZoneInformation()', then + // the adjustment we do here will be wrong and we'll return the wrong + // value (which will likely end up creating an invalid class data + // archive). Absent a better API for this, or some time zone locking + // mechanism, we'll have to live with this risk. + TIME_ZONE_INFORMATION tz; + DWORD tzid = GetTimeZoneInformation(&tz); + int daylightBias = + (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; + sbuf->st_mtime += (tz.Bias + daylightBias) * 60; + } + return ret; +} + + +#define FT2INT64(ft) \ + ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) + + +// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) +// are used by JVM M&M and JVMTI to get user+sys or user CPU time +// of a thread. +// +// current_thread_cpu_time() and thread_cpu_time(Thread*) returns +// the fast estimate available on the platform. + +// current_thread_cpu_time() is not optimized for Windows yet +jlong os::current_thread_cpu_time() { + // return user + sys since the cost is the same + return os::thread_cpu_time(Thread::current(), true /* user+sys */); +} + +jlong os::thread_cpu_time(Thread* thread) { + // consistent with what current_thread_cpu_time() returns. + return os::thread_cpu_time(thread, true /* user+sys */); +} + +jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { + return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); +} + +jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { + // This code is copy from clasic VM -> hpi::sysThreadCPUTime + // If this function changes, os::is_thread_cpu_time_supported() should too + if (os::win32::is_nt()) { + FILETIME CreationTime; + FILETIME ExitTime; + FILETIME KernelTime; + FILETIME UserTime; + + if ( GetThreadTimes(thread->osthread()->thread_handle(), + &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) + return -1; + else + if (user_sys_cpu_time) { + return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; + } else { + return FT2INT64(UserTime) * 100; + } + } else { + return (jlong) timeGetTime() * 1000000; + } +} + +void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { + info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits + info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time + info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time + info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned +} + +void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { + info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits + info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time + info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time + info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned +} + +bool os::is_thread_cpu_time_supported() { + // see os::thread_cpu_time + if (os::win32::is_nt()) { + FILETIME CreationTime; + FILETIME ExitTime; + FILETIME KernelTime; + FILETIME UserTime; + + if ( GetThreadTimes(GetCurrentThread(), + &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) + return false; + else + return true; + } else { + return false; + } +} + +// Windows does't provide a loadavg primitive so this is stubbed out for now. +// It does have primitives (PDH API) to get CPU usage and run queue length. +// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" +// If we wanted to implement loadavg on Windows, we have a few options: +// +// a) Query CPU usage and run queue length and "fake" an answer by +// returning the CPU usage if it's under 100%, and the run queue +// length otherwise. It turns out that querying is pretty slow +// on Windows, on the order of 200 microseconds on a fast machine. +// Note that on the Windows the CPU usage value is the % usage +// since the last time the API was called (and the first call +// returns 100%), so we'd have to deal with that as well. +// +// b) Sample the "fake" answer using a sampling thread and store +// the answer in a global variable. The call to loadavg would +// just return the value of the global, avoiding the slow query. +// +// c) Sample a better answer using exponential decay to smooth the +// value. This is basically the algorithm used by UNIX kernels. +// +// Note that sampling thread starvation could affect both (b) and (c). +int os::loadavg(double loadavg[], int nelem) { + return -1; +} + + +// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() +bool os::dont_yield() { + return DontYieldALot; +} + +// Is a (classpath) directory empty? +bool os::dir_is_empty(const char* path) { + WIN32_FIND_DATA fd; + HANDLE f = FindFirstFile(path, &fd); + if (f == INVALID_HANDLE_VALUE) { + return true; + } + FindClose(f); + return false; +} + +// create binary file, rewriting existing file if required +int os::create_binary_file(const char* path, bool rewrite_existing) { + int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; + if (!rewrite_existing) { + oflags |= _O_EXCL; + } + return ::open(path, oflags, _S_IREAD | _S_IWRITE); +} + +// return current position of file pointer +jlong os::current_file_offset(int fd) { + return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); +} + +// move file pointer to the specified offset +jlong os::seek_to_file_offset(int fd, jlong offset) { + return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); +} + + +// Map a block of memory. +char* os::map_memory(int fd, const char* file_name, size_t file_offset, + char *addr, size_t bytes, bool read_only, + bool allow_exec) { + HANDLE hFile; + char* base; + + hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, + OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); + if (hFile == NULL) { + if (PrintMiscellaneous && Verbose) { + DWORD err = GetLastError(); + tty->print_cr("CreateFile() failed: GetLastError->%ld."); + } + return NULL; + } + + if (allow_exec) { + // CreateFileMapping/MapViewOfFileEx can't map executable memory + // unless it comes from a PE image (which the shared archive is not.) + // Even VirtualProtect refuses to give execute access to mapped memory + // that was not previously executable. + // + // Instead, stick the executable region in anonymous memory. Yuck. + // Penalty is that ~4 pages will not be shareable - in the future + // we might consider DLLizing the shared archive with a proper PE + // header so that mapping executable + sharing is possible. + + base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, + PAGE_READWRITE); + if (base == NULL) { + if (PrintMiscellaneous && Verbose) { + DWORD err = GetLastError(); + tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); + } + CloseHandle(hFile); + return NULL; + } + + DWORD bytes_read; + OVERLAPPED overlapped; + overlapped.Offset = (DWORD)file_offset; + overlapped.OffsetHigh = 0; + overlapped.hEvent = NULL; + // ReadFile guarantees that if the return value is true, the requested + // number of bytes were read before returning. + bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; + if (!res) { + if (PrintMiscellaneous && Verbose) { + DWORD err = GetLastError(); + tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); + } + release_memory(base, bytes); + CloseHandle(hFile); + return NULL; + } + } else { + HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, + NULL /*file_name*/); + if (hMap == NULL) { + if (PrintMiscellaneous && Verbose) { + DWORD err = GetLastError(); + tty->print_cr("CreateFileMapping() failed: GetLastError->%ld."); + } + CloseHandle(hFile); + return NULL; + } + + DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; + base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, + (DWORD)bytes, addr); + if (base == NULL) { + if (PrintMiscellaneous && Verbose) { + DWORD err = GetLastError(); + tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); + } + CloseHandle(hMap); + CloseHandle(hFile); + return NULL; + } + + if (CloseHandle(hMap) == 0) { + if (PrintMiscellaneous && Verbose) { + DWORD err = GetLastError(); + tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); + } + CloseHandle(hFile); + return base; + } + } + + if (allow_exec) { + DWORD old_protect; + DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; + bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; + + if (!res) { + if (PrintMiscellaneous && Verbose) { + DWORD err = GetLastError(); + tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); + } + // Don't consider this a hard error, on IA32 even if the + // VirtualProtect fails, we should still be able to execute + CloseHandle(hFile); + return base; + } + } + + if (CloseHandle(hFile) == 0) { + if (PrintMiscellaneous && Verbose) { + DWORD err = GetLastError(); + tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); + } + return base; + } + + return base; +} + + +// Remap a block of memory. +char* os::remap_memory(int fd, const char* file_name, size_t file_offset, + char *addr, size_t bytes, bool read_only, + bool allow_exec) { + // This OS does not allow existing memory maps to be remapped so we + // have to unmap the memory before we remap it. + if (!os::unmap_memory(addr, bytes)) { + return NULL; + } + + // There is a very small theoretical window between the unmap_memory() + // call above and the map_memory() call below where a thread in native + // code may be able to access an address that is no longer mapped. + + return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, + allow_exec); +} + + +// Unmap a block of memory. +// Returns true=success, otherwise false. + +bool os::unmap_memory(char* addr, size_t bytes) { + BOOL result = UnmapViewOfFile(addr); + if (result == 0) { + if (PrintMiscellaneous && Verbose) { + DWORD err = GetLastError(); + tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); + } + return false; + } + return true; +} + +void os::pause() { + char filename[MAX_PATH]; + if (PauseAtStartupFile && PauseAtStartupFile[0]) { + jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); + } else { + jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); + } + + int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); + if (fd != -1) { + struct stat buf; + close(fd); + while (::stat(filename, &buf) == 0) { + Sleep(100); + } + } else { + jio_fprintf(stderr, + "Could not open pause file '%s', continuing immediately.\n", filename); + } +} + +// An Event wraps a win32 "CreateEvent" kernel handle. +// +// We have a number of choices regarding "CreateEvent" win32 handle leakage: +// +// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle +// field, and call CloseHandle() on the win32 event handle. Unpark() would +// need to be modified to tolerate finding a NULL (invalid) win32 event handle. +// In addition, an unpark() operation might fetch the handle field, but the +// event could recycle between the fetch and the SetEvent() operation. +// SetEvent() would either fail because the handle was invalid, or inadvertently work, +// as the win32 handle value had been recycled. In an ideal world calling SetEvent() +// on an stale but recycled handle would be harmless, but in practice this might +// confuse other non-Sun code, so it's not a viable approach. +// +// 2: Once a win32 event handle is associated with an Event, it remains associated +// with the Event. The event handle is never closed. This could be construed +// as handle leakage, but only up to the maximum # of threads that have been extant +// at any one time. This shouldn't be an issue, as windows platforms typically +// permit a process to have hundreds of thousands of open handles. +// +// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList +// and release unused handles. +// +// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. +// It's not clear, however, that we wouldn't be trading one type of leak for another. +// +// 5. Use an RCU-like mechanism (Read-Copy Update). +// Or perhaps something similar to Maged Michael's "Hazard pointers". +// +// We use (2). +// +// TODO-FIXME: +// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. +// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks +// to recover from (or at least detect) the dreaded Windows 841176 bug. +// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent +// into a single win32 CreateEvent() handle. +// +// _Event transitions in park() +// -1 => -1 : illegal +// 1 => 0 : pass - return immediately +// 0 => -1 : block +// +// _Event serves as a restricted-range semaphore : +// -1 : thread is blocked +// 0 : neutral - thread is running or ready +// 1 : signaled - thread is running or ready +// +// Another possible encoding of _Event would be +// with explicit "PARKED" and "SIGNALED" bits. + +int os::PlatformEvent::park (jlong Millis) { + guarantee (_ParkHandle != NULL , "Invariant") ; + guarantee (Millis > 0 , "Invariant") ; + int v ; + + // CONSIDER: defer assigning a CreateEvent() handle to the Event until + // the initial park() operation. + + for (;;) { + v = _Event ; + if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; + } + guarantee ((v == 0) || (v == 1), "invariant") ; + if (v != 0) return OS_OK ; + + // Do this the hard way by blocking ... + // TODO: consider a brief spin here, gated on the success of recent + // spin attempts by this thread. + // + // We decompose long timeouts into series of shorter timed waits. + // Evidently large timo values passed in WaitForSingleObject() are problematic on some + // versions of Windows. See EventWait() for details. This may be superstition. Or not. + // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time + // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from + // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend + // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == + // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate + // for the already waited time. This policy does not admit any new outcomes. + // In the future, however, we might want to track the accumulated wait time and + // adjust Millis accordingly if we encounter a spurious wakeup. + + const int MAXTIMEOUT = 0x10000000 ; + DWORD rv = WAIT_TIMEOUT ; + while (_Event < 0 && Millis > 0) { + DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT) + if (Millis > MAXTIMEOUT) { + prd = MAXTIMEOUT ; + } + rv = ::WaitForSingleObject (_ParkHandle, prd) ; + assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ; + if (rv == WAIT_TIMEOUT) { + Millis -= prd ; + } + } + v = _Event ; + _Event = 0 ; + OrderAccess::fence() ; + // If we encounter a nearly simultanous timeout expiry and unpark() + // we return OS_OK indicating we awoke via unpark(). + // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. + return (v >= 0) ? OS_OK : OS_TIMEOUT ; +} + +void os::PlatformEvent::park () { + guarantee (_ParkHandle != NULL, "Invariant") ; + // Invariant: Only the thread associated with the Event/PlatformEvent + // may call park(). + int v ; + for (;;) { + v = _Event ; + if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; + } + guarantee ((v == 0) || (v == 1), "invariant") ; + if (v != 0) return ; + + // Do this the hard way by blocking ... + // TODO: consider a brief spin here, gated on the success of recent + // spin attempts by this thread. + while (_Event < 0) { + DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ; + assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ; + } + + // Usually we'll find _Event == 0 at this point, but as + // an optional optimization we clear it, just in case can + // multiple unpark() operations drove _Event up to 1. + _Event = 0 ; + OrderAccess::fence() ; + guarantee (_Event >= 0, "invariant") ; +} + +void os::PlatformEvent::unpark() { + guarantee (_ParkHandle != NULL, "Invariant") ; + int v ; + for (;;) { + v = _Event ; // Increment _Event if it's < 1. + if (v > 0) { + // If it's already signaled just return. + // The LD of _Event could have reordered or be satisfied + // by a read-aside from this processor's write buffer. + // To avoid problems execute a barrier and then + // ratify the value. A degenerate CAS() would also work. + // Viz., CAS (v+0, &_Event, v) == v). + OrderAccess::fence() ; + if (_Event == v) return ; + continue ; + } + if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; + } + if (v < 0) { + ::SetEvent (_ParkHandle) ; + } +} + + +// JSR166 +// ------------------------------------------------------- + +/* + * The Windows implementation of Park is very straightforward: Basic + * operations on Win32 Events turn out to have the right semantics to + * use them directly. We opportunistically resuse the event inherited + * from Monitor. + */ + + +void Parker::park(bool isAbsolute, jlong time) { + guarantee (_ParkEvent != NULL, "invariant") ; + // First, demultiplex/decode time arguments + if (time < 0) { // don't wait + return; + } + else if (time == 0) { + time = INFINITE; + } + else if (isAbsolute) { + time -= os::javaTimeMillis(); // convert to relative time + if (time <= 0) // already elapsed + return; + } + else { // relative + time /= 1000000; // Must coarsen from nanos to millis + if (time == 0) // Wait for the minimal time unit if zero + time = 1; + } + + JavaThread* thread = (JavaThread*)(Thread::current()); + assert(thread->is_Java_thread(), "Must be JavaThread"); + JavaThread *jt = (JavaThread *)thread; + + // Don't wait if interrupted or already triggered + if (Thread::is_interrupted(thread, false) || + WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { + ResetEvent(_ParkEvent); + return; + } + else { + ThreadBlockInVM tbivm(jt); + OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); + jt->set_suspend_equivalent(); + + WaitForSingleObject(_ParkEvent, time); + ResetEvent(_ParkEvent); + + // If externally suspended while waiting, re-suspend + if (jt->handle_special_suspend_equivalent_condition()) { + jt->java_suspend_self(); + } + } +} + +void Parker::unpark() { + guarantee (_ParkEvent != NULL, "invariant") ; + SetEvent(_ParkEvent); +} + +// Run the specified command in a separate process. Return its exit value, +// or -1 on failure (e.g. can't create a new process). +int os::fork_and_exec(char* cmd) { + STARTUPINFO si; + PROCESS_INFORMATION pi; + + memset(&si, 0, sizeof(si)); + si.cb = sizeof(si); + memset(&pi, 0, sizeof(pi)); + BOOL rslt = CreateProcess(NULL, // executable name - use command line + cmd, // command line + NULL, // process security attribute + NULL, // thread security attribute + TRUE, // inherits system handles + 0, // no creation flags + NULL, // use parent's environment block + NULL, // use parent's starting directory + &si, // (in) startup information + &pi); // (out) process information + + if (rslt) { + // Wait until child process exits. + WaitForSingleObject(pi.hProcess, INFINITE); + + DWORD exit_code; + GetExitCodeProcess(pi.hProcess, &exit_code); + + // Close process and thread handles. + CloseHandle(pi.hProcess); + CloseHandle(pi.hThread); + + return (int)exit_code; + } else { + return -1; + } +} + +//-------------------------------------------------------------------------------------------------- +// Non-product code + +static int mallocDebugIntervalCounter = 0; +static int mallocDebugCounter = 0; +bool os::check_heap(bool force) { + if (++mallocDebugCounter < MallocVerifyStart && !force) return true; + if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { + // Note: HeapValidate executes two hardware breakpoints when it finds something + // wrong; at these points, eax contains the address of the offending block (I think). + // To get to the exlicit error message(s) below, just continue twice. + HANDLE heap = GetProcessHeap(); + { HeapLock(heap); + PROCESS_HEAP_ENTRY phe; + phe.lpData = NULL; + while (HeapWalk(heap, &phe) != 0) { + if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && + !HeapValidate(heap, 0, phe.lpData)) { + tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); + tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); + fatal("corrupted C heap"); + } + } + int err = GetLastError(); + if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { + fatal1("heap walk aborted with error %d", err); + } + HeapUnlock(heap); + } + mallocDebugIntervalCounter = 0; + } + return true; +} + + +#ifndef PRODUCT +bool os::find(address addr) { + // Nothing yet + return false; +} +#endif + +LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { + DWORD exception_code = e->ExceptionRecord->ExceptionCode; + + if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { + JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); + PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; + address addr = (address) exceptionRecord->ExceptionInformation[1]; + + if (os::is_memory_serialize_page(thread, addr)) + return EXCEPTION_CONTINUE_EXECUTION; + } + + return EXCEPTION_CONTINUE_SEARCH; +} + +static int getLastErrorString(char *buf, size_t len) +{ + long errval; + + if ((errval = GetLastError()) != 0) + { + /* DOS error */ + size_t n = (size_t)FormatMessage( + FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, + NULL, + errval, + 0, + buf, + (DWORD)len, + NULL); + if (n > 3) { + /* Drop final '.', CR, LF */ + if (buf[n - 1] == '\n') n--; + if (buf[n - 1] == '\r') n--; + if (buf[n - 1] == '.') n--; + buf[n] = '\0'; + } + return (int)n; + } + + if (errno != 0) + { + /* C runtime error that has no corresponding DOS error code */ + const char *s = strerror(errno); + size_t n = strlen(s); + if (n >= len) n = len - 1; + strncpy(buf, s, n); + buf[n] = '\0'; + return (int)n; + } + return 0; +}