1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef OS_WINDOWS_VM_OS_WINDOWS_HPP
26 #define OS_WINDOWS_VM_OS_WINDOWS_HPP
27 // Win32_OS defines the interface to windows operating systems
28
29 // Information about the protection of the page at address '0' on this os.
30 static bool zero_page_read_protected() { return true; }
31
32 // File conventions
33 static const char* file_separator() { return "\\"; }
34 static const char* line_separator() { return "\r\n"; }
35 static const char* path_separator() { return ";"; }
36
37 class win32 {
38 friend class os;
39 friend unsigned __stdcall thread_native_entry(class Thread*);
40
41 protected:
42 static int _vm_page_size;
43 static int _vm_allocation_granularity;
44 static int _processor_type;
45 static int _processor_level;
46 static julong _physical_memory;
47 static size_t _default_stack_size;
48 static bool _is_windows_server;
49 static bool _has_exit_bug;
50
51 static void print_windows_version(outputStream* st);
52
53 public:
54 // Windows-specific interface:
55 static void initialize_system_info();
56 static void setmode_streams();
57
58 // Processor info as provided by NT
59 static int processor_type() { return _processor_type; }
60 static int processor_level() {
61 return _processor_level;
62 }
63 static julong available_memory();
64 static julong physical_memory() { return _physical_memory; }
65
66 // load dll from Windows system directory or Windows directory
67 static HINSTANCE load_Windows_dll(const char* name, char *ebuf, int ebuflen);
68
69 private:
70 enum Ept { EPT_THREAD, EPT_PROCESS, EPT_PROCESS_DIE };
71 // Wrapper around _endthreadex(), exit() and _exit()
72 static int exit_process_or_thread(Ept what, int exit_code);
73
74 static void initialize_performance_counter();
75
76 public:
77 // Generic interface:
78
79 // Trace number of created threads
80 static intx _os_thread_limit;
81 static volatile intx _os_thread_count;
82
83 // Tells whether this is a server version of Windows
84 static bool is_windows_server() { return _is_windows_server; }
85
86 // Tells whether there can be the race bug during process exit on this platform
87 static bool has_exit_bug() { return _has_exit_bug; }
88
89 // Returns the byte size of a virtual memory page
90 static int vm_page_size() { return _vm_page_size; }
91
92 // Returns the size in bytes of memory blocks which can be allocated.
93 static int vm_allocation_granularity() { return _vm_allocation_granularity; }
94
95 // Read the headers for the executable that started the current process into
96 // the structure passed in (see winnt.h).
97 static void read_executable_headers(PIMAGE_NT_HEADERS);
98
99 // Default stack size for the current process.
100 static size_t default_stack_size() { return _default_stack_size; }
101
102 static bool get_frame_at_stack_banging_point(JavaThread* thread,
103 struct _EXCEPTION_POINTERS* exceptionInfo,
104 address pc, frame* fr);
105
106 #ifndef _WIN64
107 // A wrapper to install a structured exception handler for fast JNI accesors.
108 static address fast_jni_accessor_wrapper(BasicType);
109 #endif
110
111 // filter function to ignore faults on serializations page
112 static LONG WINAPI serialize_fault_filter(struct _EXCEPTION_POINTERS* e);
113
114 // Fast access to current thread
115 protected:
116 static int _thread_ptr_offset;
117 private:
118 static void initialize_thread_ptr_offset();
119 public:
120 static inline void set_thread_ptr_offset(int offset) {
121 _thread_ptr_offset = offset;
122 }
123 static inline int get_thread_ptr_offset() { return _thread_ptr_offset; }
124 };
125
126 static void write_memory_serialize_page_with_handler(JavaThread* thread) {
127 // Due to chained nature of SEH handlers we have to be sure
128 // that our handler is always last handler before an attempt to write
129 // into serialization page - it can fault if we access this page
130 // right in the middle of protect/unprotect sequence by remote
131 // membar logic.
132 // __try/__except are very lightweight operations (only several
133 // instructions not affecting control flow directly on x86)
134 // so we can use it here, on very time critical path
135 __try {
136 write_memory_serialize_page(thread);
137 } __except (win32::serialize_fault_filter((_EXCEPTION_POINTERS*)_exception_info()))
138 {}
139 }
140
141 /*
142 * Crash protection for the watcher thread. Wrap the callback
143 * with a __try { call() }
144 * To be able to use this - don't take locks, don't rely on destructors,
145 * don't make OS library calls, don't allocate memory, don't print,
146 * don't call code that could leave the heap / memory in an inconsistent state,
147 * or anything else where we are not in control if we suddenly jump out.
148 */
149 class WatcherThreadCrashProtection : public StackObj {
150 public:
151 WatcherThreadCrashProtection();
152 bool call(os::CrashProtectionCallback& cb);
153 };
154
155 class PlatformEvent : public CHeapObj<mtInternal> {
156 private:
157 double CachePad [4] ; // increase odds that _Event is sole occupant of cache line
158 volatile int _Event ;
159 HANDLE _ParkHandle ;
160
161 public: // TODO-FIXME: make dtor private
162 ~PlatformEvent() { guarantee (0, "invariant") ; }
163
164 public:
165 PlatformEvent() {
166 _Event = 0 ;
167 _ParkHandle = CreateEvent (NULL, false, false, NULL) ;
168 guarantee (_ParkHandle != NULL, "invariant") ;
169 }
170
171 // Exercise caution using reset() and fired() - they may require MEMBARs
172 void reset() { _Event = 0 ; }
173 int fired() { return _Event; }
174 void park () ;
175 void unpark () ;
176 int park (jlong millis) ;
177 } ;
178
179
180
181 class PlatformParker : public CHeapObj<mtInternal> {
182 protected:
183 HANDLE _ParkEvent ;
184
185 public:
186 ~PlatformParker () { guarantee (0, "invariant") ; }
187 PlatformParker () {
188 _ParkEvent = CreateEvent (NULL, true, false, NULL) ;
189 guarantee (_ParkEvent != NULL, "invariant") ;
190 }
191
192 } ;
193
194 #endif // OS_WINDOWS_VM_OS_WINDOWS_HPP