| /* |
| * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef OS_WINDOWS_VM_OS_WINDOWS_HPP |
| #define OS_WINDOWS_VM_OS_WINDOWS_HPP |
| // Win32_OS defines the interface to windows operating systems |
| |
| // Information about the protection of the page at address '0' on this os. |
| static bool zero_page_read_protected() { return true; } |
| |
| // File conventions |
| static const char* file_separator() { return "\\"; } |
| static const char* line_separator() { return "\r\n"; } |
| static const char* path_separator() { return ";"; } |
| |
| class win32 { |
| friend class os; |
| friend unsigned __stdcall thread_native_entry(class Thread*); |
| |
| protected: |
| static int _vm_page_size; |
| static int _vm_allocation_granularity; |
| static int _processor_type; |
| static int _processor_level; |
| static julong _physical_memory; |
| static size_t _default_stack_size; |
| static bool _is_windows_server; |
| static bool _has_exit_bug; |
| |
| static void print_windows_version(outputStream* st); |
| |
| public: |
| // Windows-specific interface: |
| static void initialize_system_info(); |
| static void setmode_streams(); |
| |
| // Processor info as provided by NT |
| static int processor_type() { return _processor_type; } |
| static int processor_level() { |
| return _processor_level; |
| } |
| static julong available_memory(); |
| static julong physical_memory() { return _physical_memory; } |
| |
| // load dll from Windows system directory or Windows directory |
| static HINSTANCE load_Windows_dll(const char* name, char *ebuf, int ebuflen); |
| |
| private: |
| enum Ept { EPT_THREAD, EPT_PROCESS, EPT_PROCESS_DIE }; |
| // Wrapper around _endthreadex(), exit() and _exit() |
| static int exit_process_or_thread(Ept what, int exit_code); |
| |
| static void initialize_performance_counter(); |
| |
| public: |
| // Generic interface: |
| |
| // Trace number of created threads |
| static intx _os_thread_limit; |
| static volatile intx _os_thread_count; |
| |
| // Tells whether this is a server version of Windows |
| static bool is_windows_server() { return _is_windows_server; } |
| |
| // Tells whether there can be the race bug during process exit on this platform |
| static bool has_exit_bug() { return _has_exit_bug; } |
| |
| // Returns the byte size of a virtual memory page |
| static int vm_page_size() { return _vm_page_size; } |
| |
| // Returns the size in bytes of memory blocks which can be allocated. |
| static int vm_allocation_granularity() { return _vm_allocation_granularity; } |
| |
| // Read the headers for the executable that started the current process into |
| // the structure passed in (see winnt.h). |
| static void read_executable_headers(PIMAGE_NT_HEADERS); |
| |
| // Default stack size for the current process. |
| static size_t default_stack_size() { return _default_stack_size; } |
| |
| static bool get_frame_at_stack_banging_point(JavaThread* thread, |
| struct _EXCEPTION_POINTERS* exceptionInfo, |
| address pc, frame* fr); |
| |
| #ifndef _WIN64 |
| // A wrapper to install a structured exception handler for fast JNI accesors. |
| static address fast_jni_accessor_wrapper(BasicType); |
| #endif |
| |
| // filter function to ignore faults on serializations page |
| static LONG WINAPI serialize_fault_filter(struct _EXCEPTION_POINTERS* e); |
| |
| // Fast access to current thread |
| protected: |
| static int _thread_ptr_offset; |
| private: |
| static void initialize_thread_ptr_offset(); |
| public: |
| static inline void set_thread_ptr_offset(int offset) { |
| _thread_ptr_offset = offset; |
| } |
| static inline int get_thread_ptr_offset() { return _thread_ptr_offset; } |
| }; |
| |
| static void write_memory_serialize_page_with_handler(JavaThread* thread) { |
| // Due to chained nature of SEH handlers we have to be sure |
| // that our handler is always last handler before an attempt to write |
| // into serialization page - it can fault if we access this page |
| // right in the middle of protect/unprotect sequence by remote |
| // membar logic. |
| // __try/__except are very lightweight operations (only several |
| // instructions not affecting control flow directly on x86) |
| // so we can use it here, on very time critical path |
| __try { |
| write_memory_serialize_page(thread); |
| } __except (win32::serialize_fault_filter((_EXCEPTION_POINTERS*)_exception_info())) |
| {} |
| } |
| |
| /* |
| * Crash protection for the watcher thread. Wrap the callback |
| * with a __try { call() } |
| * To be able to use this - don't take locks, don't rely on destructors, |
| * don't make OS library calls, don't allocate memory, don't print, |
| * don't call code that could leave the heap / memory in an inconsistent state, |
| * or anything else where we are not in control if we suddenly jump out. |
| */ |
| class ThreadCrashProtection : public StackObj { |
| public: |
| static bool is_crash_protected(Thread* thr) { |
| return _crash_protection != NULL && _protected_thread == thr; |
| } |
| |
| ThreadCrashProtection(); |
| bool call(os::CrashProtectionCallback& cb); |
| private: |
| static Thread* _protected_thread; |
| static ThreadCrashProtection* _crash_protection; |
| static volatile intptr_t _crash_mux; |
| }; |
| |
| class PlatformEvent : public CHeapObj<mtInternal> { |
| private: |
| double CachePad [4] ; // increase odds that _Event is sole occupant of cache line |
| volatile int _Event ; |
| HANDLE _ParkHandle ; |
| |
| public: // TODO-FIXME: make dtor private |
| ~PlatformEvent() { guarantee (0, "invariant") ; } |
| |
| public: |
| PlatformEvent() { |
| _Event = 0 ; |
| _ParkHandle = CreateEvent (NULL, false, false, NULL) ; |
| guarantee (_ParkHandle != NULL, "invariant") ; |
| } |
| |
| // Exercise caution using reset() and fired() - they may require MEMBARs |
| void reset() { _Event = 0 ; } |
| int fired() { return _Event; } |
| void park () ; |
| void unpark () ; |
| int park (jlong millis) ; |
| } ; |
| |
| |
| |
| class PlatformParker : public CHeapObj<mtInternal> { |
| protected: |
| HANDLE _ParkEvent ; |
| |
| public: |
| ~PlatformParker () { guarantee (0, "invariant") ; } |
| PlatformParker () { |
| _ParkEvent = CreateEvent (NULL, true, false, NULL) ; |
| guarantee (_ParkEvent != NULL, "invariant") ; |
| } |
| |
| } ; |
| |
| #endif // OS_WINDOWS_VM_OS_WINDOWS_HPP |