Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/os.hpp @ 20568:46140919bf90
8047934: Adding new API for unlocking diagnostic argument.
Summary: New API for unlocking diagnostic argument.
Reviewed-by: dholmes, ccheung, egahlin, iklam, bdelsart
author | jiangli |
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date | Tue, 14 Oct 2014 12:09:33 -0400 |
parents | c12e6bac4ad0 |
children | 7848fc12602b 8461d0b03127 |
rev | line source |
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0 | 1 /* |
17567 | 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_OS_HPP |
26 #define SHARE_VM_RUNTIME_OS_HPP | |
27 | |
28 #include "jvmtifiles/jvmti.h" | |
29 #include "runtime/atomic.hpp" | |
30 #include "runtime/extendedPC.hpp" | |
31 #include "runtime/handles.hpp" | |
32 #include "utilities/top.hpp" | |
33 #ifdef TARGET_OS_FAMILY_linux | |
34 # include "jvm_linux.h" | |
11151 | 35 # include <setjmp.h> |
1972 | 36 #endif |
37 #ifdef TARGET_OS_FAMILY_solaris | |
38 # include "jvm_solaris.h" | |
11151 | 39 # include <setjmp.h> |
1972 | 40 #endif |
41 #ifdef TARGET_OS_FAMILY_windows | |
42 # include "jvm_windows.h" | |
43 #endif | |
14411 | 44 #ifdef TARGET_OS_FAMILY_aix |
45 # include "jvm_aix.h" | |
46 # include <setjmp.h> | |
47 #endif | |
3960 | 48 #ifdef TARGET_OS_FAMILY_bsd |
49 # include "jvm_bsd.h" | |
11151 | 50 # include <setjmp.h> |
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51 # ifdef __APPLE__ |
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52 # include <mach/mach_time.h> |
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53 # endif |
3960 | 54 #endif |
1972 | 55 |
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56 class AgentLibrary; |
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57 |
0 | 58 // os defines the interface to operating system; this includes traditional |
59 // OS services (time, I/O) as well as other functionality with system- | |
60 // dependent code. | |
61 | |
62 typedef void (*dll_func)(...); | |
63 | |
64 class Thread; | |
65 class JavaThread; | |
66 class Event; | |
67 class DLL; | |
68 class FileHandle; | |
20360 | 69 class NativeCallStack; |
70 | |
141 | 71 template<class E> class GrowableArray; |
0 | 72 |
73 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose | |
74 | |
75 // Platform-independent error return values from OS functions | |
76 enum OSReturn { | |
77 OS_OK = 0, // Operation was successful | |
78 OS_ERR = -1, // Operation failed | |
79 OS_INTRPT = -2, // Operation was interrupted | |
80 OS_TIMEOUT = -3, // Operation timed out | |
81 OS_NOMEM = -5, // Operation failed for lack of memory | |
82 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource | |
83 }; | |
84 | |
85 enum ThreadPriority { // JLS 20.20.1-3 | |
86 NoPriority = -1, // Initial non-priority value | |
87 MinPriority = 1, // Minimum priority | |
88 NormPriority = 5, // Normal (non-daemon) priority | |
89 NearMaxPriority = 9, // High priority, used for VMThread | |
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90 MaxPriority = 10, // Highest priority, used for WatcherThread |
0 | 91 // ensures that VMThread doesn't starve profiler |
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92 CriticalPriority = 11 // Critical thread priority |
0 | 93 }; |
94 | |
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95 // Executable parameter flag for os::commit_memory() and |
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96 // os::commit_memory_or_exit(). |
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97 const bool ExecMem = true; |
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98 |
0 | 99 // Typedef for structured exception handling support |
100 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
101 | |
20360 | 102 class MallocTracker; |
103 | |
0 | 104 class os: AllStatic { |
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105 friend class VMStructs; |
20360 | 106 friend class MallocTracker; |
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107 public: |
0 | 108 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) |
109 | |
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110 private: |
0 | 111 static OSThread* _starting_thread; |
112 static address _polling_page; | |
113 static volatile int32_t * _mem_serialize_page; | |
114 static uintptr_t _serialize_page_mask; | |
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115 public: |
0 | 116 static size_t _page_sizes[page_sizes_max]; |
117 | |
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118 private: |
0 | 119 static void init_page_sizes(size_t default_page_size) { |
120 _page_sizes[0] = default_page_size; | |
121 _page_sizes[1] = 0; // sentinel | |
122 } | |
123 | |
6197 | 124 static char* pd_reserve_memory(size_t bytes, char* addr = 0, |
125 size_t alignment_hint = 0); | |
126 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); | |
127 static void pd_split_reserved_memory(char *base, size_t size, | |
128 size_t split, bool realloc); | |
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129 static bool pd_commit_memory(char* addr, size_t bytes, bool executable); |
6197 | 130 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
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131 bool executable); |
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132 // Same as pd_commit_memory() that either succeeds or calls |
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133 // vm_exit_out_of_memory() with the specified mesg. |
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134 static void pd_commit_memory_or_exit(char* addr, size_t bytes, |
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135 bool executable, const char* mesg); |
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136 static void pd_commit_memory_or_exit(char* addr, size_t size, |
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137 size_t alignment_hint, |
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138 bool executable, const char* mesg); |
6197 | 139 static bool pd_uncommit_memory(char* addr, size_t bytes); |
140 static bool pd_release_memory(char* addr, size_t bytes); | |
141 | |
142 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, | |
143 char *addr, size_t bytes, bool read_only = false, | |
144 bool allow_exec = false); | |
145 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, | |
146 char *addr, size_t bytes, bool read_only, | |
147 bool allow_exec); | |
148 static bool pd_unmap_memory(char *addr, size_t bytes); | |
149 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); | |
150 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); | |
151 | |
152 | |
0 | 153 public: |
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154 static void init(void); // Called before command line parsing |
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155 static void init_before_ergo(void); // Called after command line parsing |
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156 // before VM ergonomics processing. |
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157 static jint init_2(void); // Called after command line parsing |
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158 // and VM ergonomics processing |
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159 static void init_globals(void) { // Called from init_globals() in init.cpp |
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160 init_globals_ext(); |
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161 } |
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162 static void init_3(void); // Called at the end of vm init |
0 | 163 |
164 // File names are case-insensitive on windows only | |
165 // Override me as needed | |
166 static int file_name_strcmp(const char* s1, const char* s2); | |
167 | |
20360 | 168 // get/unset environment variable |
0 | 169 static bool getenv(const char* name, char* buffer, int len); |
20360 | 170 static bool unsetenv(const char* name); |
171 | |
0 | 172 static bool have_special_privileges(); |
173 | |
174 static jlong javaTimeMillis(); | |
175 static jlong javaTimeNanos(); | |
176 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); | |
177 static void run_periodic_checks(); | |
178 | |
179 | |
180 // Returns the elapsed time in seconds since the vm started. | |
181 static double elapsedTime(); | |
182 | |
183 // Returns real time in seconds since an arbitrary point | |
184 // in the past. | |
185 static bool getTimesSecs(double* process_real_time, | |
186 double* process_user_time, | |
187 double* process_system_time); | |
188 | |
189 // Interface to the performance counter | |
190 static jlong elapsed_counter(); | |
191 static jlong elapsed_frequency(); | |
192 | |
342
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193 // The "virtual time" of a thread is the amount of time a thread has |
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194 // actually run. The first function indicates whether the OS supports |
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195 // this functionality for the current thread, and if so: |
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196 // * the second enables vtime tracking (if that is required). |
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197 // * the third tells whether vtime is enabled. |
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198 // * the fourth returns the elapsed virtual time for the current |
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199 // thread. |
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200 static bool supports_vtime(); |
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201 static bool enable_vtime(); |
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202 static bool vtime_enabled(); |
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203 static double elapsedVTime(); |
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204 |
0 | 205 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). |
206 // It is MT safe, but not async-safe, as reading time zone | |
207 // information may require a lock on some platforms. | |
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208 static char* local_time_string(char *buf, size_t buflen); |
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209 static struct tm* localtime_pd (const time_t* clock, struct tm* res); |
0 | 210 // Fill in buffer with current local time as an ISO-8601 string. |
211 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. | |
212 // Returns buffer, or NULL if it failed. | |
213 static char* iso8601_time(char* buffer, size_t buffer_length); | |
214 | |
215 // Interface for detecting multiprocessor system | |
216 static inline bool is_MP() { | |
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217 // During bootstrap if _processor_count is not yet initialized |
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218 // we claim to be MP as that is safest. If any platform has a |
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219 // stub generator that might be triggered in this phase and for |
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220 // which being declared MP when in fact not, is a problem - then |
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221 // the bootstrap routine for the stub generator needs to check |
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222 // the processor count directly and leave the bootstrap routine |
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223 // in place until called after initialization has ocurred. |
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224 return (_processor_count != 1) || AssumeMP; |
0 | 225 } |
226 static julong available_memory(); | |
227 static julong physical_memory(); | |
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228 static bool has_allocatable_memory_limit(julong* limit); |
0 | 229 static bool is_server_class_machine(); |
230 | |
231 // number of CPUs | |
232 static int processor_count() { | |
233 return _processor_count; | |
234 } | |
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235 static void set_processor_count(int count) { _processor_count = count; } |
0 | 236 |
237 // Returns the number of CPUs this process is currently allowed to run on. | |
238 // Note that on some OSes this can change dynamically. | |
239 static int active_processor_count(); | |
240 | |
241 // Bind processes to processors. | |
242 // This is a two step procedure: | |
243 // first you generate a distribution of processes to processors, | |
244 // then you bind processes according to that distribution. | |
245 // Compute a distribution for number of processes to processors. | |
246 // Stores the processor id's into the distribution array argument. | |
247 // Returns true if it worked, false if it didn't. | |
248 static bool distribute_processes(uint length, uint* distribution); | |
249 // Binds the current process to a processor. | |
250 // Returns true if it worked, false if it didn't. | |
251 static bool bind_to_processor(uint processor_id); | |
252 | |
4006 | 253 // Give a name to the current thread. |
254 static void set_native_thread_name(const char *name); | |
255 | |
0 | 256 // Interface for stack banging (predetect possible stack overflow for |
257 // exception processing) There are guard pages, and above that shadow | |
258 // pages for stack overflow checking. | |
259 static bool uses_stack_guard_pages(); | |
260 static bool allocate_stack_guard_pages(); | |
261 static void bang_stack_shadow_pages(); | |
262 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); | |
263 | |
264 // OS interface to Virtual Memory | |
265 | |
266 // Return the default page size. | |
267 static int vm_page_size(); | |
268 | |
269 // Return the page size to use for a region of memory. The min_pages argument | |
270 // is a hint intended to limit fragmentation; it says the returned page size | |
271 // should be <= region_max_size / min_pages. Because min_pages is a hint, | |
272 // this routine may return a size larger than region_max_size / min_pages. | |
273 // | |
274 // The current implementation ignores min_pages if a larger page size is an | |
275 // exact multiple of both region_min_size and region_max_size. This allows | |
276 // larger pages to be used when doing so would not cause fragmentation; in | |
277 // particular, a single page can be used when region_min_size == | |
278 // region_max_size == a supported page size. | |
279 static size_t page_size_for_region(size_t region_min_size, | |
280 size_t region_max_size, | |
281 uint min_pages); | |
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282 // Return the largest page size that can be used |
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283 static size_t max_page_size() { |
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284 // The _page_sizes array is sorted in descending order. |
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285 return _page_sizes[0]; |
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286 } |
0 | 287 |
3859 | 288 // Methods for tracing page sizes returned by the above method; enabled by |
0 | 289 // TracePageSizes. The region_{min,max}_size parameters should be the values |
290 // passed to page_size_for_region() and page_size should be the result of that | |
291 // call. The (optional) base and size parameters should come from the | |
292 // ReservedSpace base() and size() methods. | |
3859 | 293 static void trace_page_sizes(const char* str, const size_t* page_sizes, |
294 int count) PRODUCT_RETURN; | |
0 | 295 static void trace_page_sizes(const char* str, const size_t region_min_size, |
296 const size_t region_max_size, | |
297 const size_t page_size, | |
298 const char* base = NULL, | |
299 const size_t size = 0) PRODUCT_RETURN; | |
300 | |
301 static int vm_allocation_granularity(); | |
302 static char* reserve_memory(size_t bytes, char* addr = 0, | |
303 size_t alignment_hint = 0); | |
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304 static char* reserve_memory(size_t bytes, char* addr, |
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305 size_t alignment_hint, MEMFLAGS flags); |
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306 static char* reserve_memory_aligned(size_t size, size_t alignment); |
0 | 307 static char* attempt_reserve_memory_at(size_t bytes, char* addr); |
308 static void split_reserved_memory(char *base, size_t size, | |
309 size_t split, bool realloc); | |
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310 static bool commit_memory(char* addr, size_t bytes, bool executable); |
656 | 311 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, |
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312 bool executable); |
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313 // Same as commit_memory() that either succeeds or calls |
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314 // vm_exit_out_of_memory() with the specified mesg. |
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315 static void commit_memory_or_exit(char* addr, size_t bytes, |
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316 bool executable, const char* mesg); |
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317 static void commit_memory_or_exit(char* addr, size_t size, |
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318 size_t alignment_hint, |
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319 bool executable, const char* mesg); |
0 | 320 static bool uncommit_memory(char* addr, size_t bytes); |
321 static bool release_memory(char* addr, size_t bytes); | |
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322 |
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323 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; |
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324 static bool protect_memory(char* addr, size_t bytes, ProtType prot, |
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325 bool is_committed = true); |
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326 |
0 | 327 static bool guard_memory(char* addr, size_t bytes); |
328 static bool unguard_memory(char* addr, size_t bytes); | |
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329 static bool create_stack_guard_pages(char* addr, size_t bytes); |
6197 | 330 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); |
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331 static bool remove_stack_guard_pages(char* addr, size_t bytes); |
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332 |
0 | 333 static char* map_memory(int fd, const char* file_name, size_t file_offset, |
334 char *addr, size_t bytes, bool read_only = false, | |
335 bool allow_exec = false); | |
336 static char* remap_memory(int fd, const char* file_name, size_t file_offset, | |
337 char *addr, size_t bytes, bool read_only, | |
338 bool allow_exec); | |
339 static bool unmap_memory(char *addr, size_t bytes); | |
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340 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); |
0 | 341 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); |
342 | |
343 // NUMA-specific interface | |
141 | 344 static bool numa_has_static_binding(); |
345 static bool numa_has_group_homing(); | |
346 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); | |
0 | 347 static void numa_make_global(char *addr, size_t bytes); |
348 static size_t numa_get_groups_num(); | |
349 static size_t numa_get_leaf_groups(int *ids, size_t size); | |
350 static bool numa_topology_changed(); | |
351 static int numa_get_group_id(); | |
352 | |
353 // Page manipulation | |
354 struct page_info { | |
355 size_t size; | |
356 int lgrp_id; | |
357 }; | |
358 static bool get_page_info(char *start, page_info* info); | |
359 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); | |
360 | |
361 static char* non_memory_address_word(); | |
362 // reserve, commit and pin the entire memory region | |
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363 static char* reserve_memory_special(size_t size, size_t alignment, |
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364 char* addr, bool executable); |
0 | 365 static bool release_memory_special(char* addr, size_t bytes); |
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366 static void large_page_init(); |
0 | 367 static size_t large_page_size(); |
368 static bool can_commit_large_page_memory(); | |
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369 static bool can_execute_large_page_memory(); |
0 | 370 |
371 // OS interface to polling page | |
372 static address get_polling_page() { return _polling_page; } | |
373 static void set_polling_page(address page) { _polling_page = page; } | |
374 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } | |
375 static void make_polling_page_unreadable(); | |
376 static void make_polling_page_readable(); | |
377 | |
378 // Routines used to serialize the thread state without using membars | |
379 static void serialize_thread_states(); | |
380 | |
381 // Since we write to the serialize page from every thread, we | |
382 // want stores to be on unique cache lines whenever possible | |
383 // in order to minimize CPU cross talk. We pre-compute the | |
384 // amount to shift the thread* to make this offset unique to | |
385 // each thread. | |
386 static int get_serialize_page_shift_count() { | |
387 return SerializePageShiftCount; | |
388 } | |
389 | |
390 static void set_serialize_page_mask(uintptr_t mask) { | |
391 _serialize_page_mask = mask; | |
392 } | |
393 | |
394 static unsigned int get_serialize_page_mask() { | |
395 return _serialize_page_mask; | |
396 } | |
397 | |
398 static void set_memory_serialize_page(address page); | |
399 | |
400 static address get_memory_serialize_page() { | |
401 return (address)_mem_serialize_page; | |
402 } | |
403 | |
404 static inline void write_memory_serialize_page(JavaThread *thread) { | |
405 uintptr_t page_offset = ((uintptr_t)thread >> | |
406 get_serialize_page_shift_count()) & | |
407 get_serialize_page_mask(); | |
408 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; | |
409 } | |
410 | |
411 static bool is_memory_serialize_page(JavaThread *thread, address addr) { | |
412 if (UseMembar) return false; | |
1078 | 413 // Previously this function calculated the exact address of this |
414 // thread's serialize page, and checked if the faulting address | |
415 // was equal. However, some platforms mask off faulting addresses | |
416 // to the page size, so now we just check that the address is | |
417 // within the page. This makes the thread argument unnecessary, | |
418 // but we retain the NULL check to preserve existing behaviour. | |
0 | 419 if (thread == NULL) return false; |
1078 | 420 address page = (address) _mem_serialize_page; |
421 return addr >= page && addr < (page + os::vm_page_size()); | |
0 | 422 } |
423 | |
424 static void block_on_serialize_page_trap(); | |
425 | |
426 // threads | |
427 | |
428 enum ThreadType { | |
429 vm_thread, | |
430 cgc_thread, // Concurrent GC thread | |
431 pgc_thread, // Parallel GC thread | |
432 java_thread, | |
433 compiler_thread, | |
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434 watcher_thread, |
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435 os_thread |
0 | 436 }; |
437 | |
438 static bool create_thread(Thread* thread, | |
439 ThreadType thr_type, | |
440 size_t stack_size = 0); | |
441 static bool create_main_thread(JavaThread* thread); | |
442 static bool create_attached_thread(JavaThread* thread); | |
443 static void pd_start_thread(Thread* thread); | |
444 static void start_thread(Thread* thread); | |
445 | |
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446 static void initialize_thread(Thread* thr); |
0 | 447 static void free_thread(OSThread* osthread); |
448 | |
449 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit | |
450 static intx current_thread_id(); | |
451 static int current_process_id(); | |
452 static int sleep(Thread* thread, jlong ms, bool interruptable); | |
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453 // Short standalone OS sleep suitable for slow path spin loop. |
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454 // Ignores Thread.interrupt() (so keep it short). |
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455 // ms = 0, will sleep for the least amount of time allowed by the OS. |
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456 static void naked_short_sleep(jlong ms); |
0 | 457 static void infinite_sleep(); // never returns, use with CAUTION |
458 static void yield(); // Yields to all threads with same priority | |
459 enum YieldResult { | |
460 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran | |
461 YIELD_NONEREADY = 0, // No other runnable/ready threads. | |
462 // platform-specific yield return immediately | |
463 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY | |
464 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" | |
465 // yield that can be used in lieu of blocking. | |
466 } ; | |
467 static YieldResult NakedYield () ; | |
468 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority | |
469 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing | |
470 static OSReturn set_priority(Thread* thread, ThreadPriority priority); | |
471 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); | |
472 | |
473 static void interrupt(Thread* thread); | |
474 static bool is_interrupted(Thread* thread, bool clear_interrupted); | |
475 | |
476 static int pd_self_suspend_thread(Thread* thread); | |
477 | |
478 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); | |
479 static frame fetch_frame_from_context(void* ucVoid); | |
480 | |
481 static ExtendedPC get_thread_pc(Thread *thread); | |
482 static void breakpoint(); | |
483 | |
484 static address current_stack_pointer(); | |
485 static address current_stack_base(); | |
486 static size_t current_stack_size(); | |
487 | |
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488 static void verify_stack_alignment() PRODUCT_RETURN; |
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489 |
0 | 490 static int message_box(const char* title, const char* message); |
491 static char* do_you_want_to_debug(const char* message); | |
492 | |
493 // run cmd in a separate process and return its exit code; or -1 on failures | |
494 static int fork_and_exec(char *cmd); | |
495 | |
496 // os::exit() is merged with vm_exit() | |
497 // static void exit(int num); | |
498 | |
499 // Terminate the VM, but don't exit the process | |
500 static void shutdown(); | |
501 | |
502 // Terminate with an error. Default is to generate a core file on platforms | |
503 // that support such things. This calls shutdown() and then aborts. | |
504 static void abort(bool dump_core = true); | |
505 | |
506 // Die immediately, no exit hook, no abort hook, no cleanup. | |
507 static void die(); | |
508 | |
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509 // File i/o operations |
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510 static const int default_file_open_flags(); |
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511 static int open(const char *path, int oflag, int mode); |
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512 static FILE* open(int fd, const char* mode); |
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513 static int close(int fd); |
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514 static jlong lseek(int fd, jlong offset, int whence); |
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515 static char* native_path(char *path); |
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516 static int ftruncate(int fd, jlong length); |
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517 static int fsync(int fd); |
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518 static int available(int fd, jlong *bytes); |
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519 |
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520 //File i/o operations |
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521 |
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522 static size_t read(int fd, void *buf, unsigned int nBytes); |
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523 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); |
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524 static size_t write(int fd, const void *buf, unsigned int nBytes); |
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525 |
0 | 526 // Reading directories. |
527 static DIR* opendir(const char* dirname); | |
528 static int readdir_buf_size(const char *path); | |
529 static struct dirent* readdir(DIR* dirp, dirent* dbuf); | |
530 static int closedir(DIR* dirp); | |
531 | |
532 // Dynamic library extension | |
533 static const char* dll_file_extension(); | |
534 | |
535 static const char* get_temp_directory(); | |
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536 static const char* get_current_directory(char *buf, size_t buflen); |
0 | 537 |
242 | 538 // Builds a platform-specific full library path given a ld path and lib name |
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539 // Returns true if buffer contains full path to existing file, false otherwise |
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540 static bool dll_build_name(char* buffer, size_t size, |
242 | 541 const char* pathname, const char* fname); |
542 | |
0 | 543 // Symbol lookup, find nearest function name; basically it implements |
544 // dladdr() for all platforms. Name of the nearest function is copied | |
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545 // to buf. Distance from its base address is optionally returned as offset. |
0 | 546 // If function name is not found, buf[0] is set to '\0' and offset is |
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547 // set to -1 (if offset is non-NULL). |
0 | 548 static bool dll_address_to_function_name(address addr, char* buf, |
549 int buflen, int* offset); | |
550 | |
551 // Locate DLL/DSO. On success, full path of the library is copied to | |
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552 // buf, and offset is optionally set to be the distance between addr |
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553 // and the library's base address. On failure, buf[0] is set to '\0' |
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554 // and offset is set to -1 (if offset is non-NULL). |
0 | 555 static bool dll_address_to_library_name(address addr, char* buf, |
556 int buflen, int* offset); | |
557 | |
558 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. | |
559 static bool address_is_in_vm(address addr); | |
560 | |
561 // Loads .dll/.so and | |
562 // in case of error it checks if .dll/.so was built for the | |
563 // same architecture as Hotspot is running on | |
564 static void* dll_load(const char *name, char *ebuf, int ebuflen); | |
565 | |
242 | 566 // lookup symbol in a shared library |
567 static void* dll_lookup(void* handle, const char* name); | |
568 | |
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569 // Unload library |
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570 static void dll_unload(void *lib); |
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571 |
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572 // Return the handle of this process |
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573 static void* get_default_process_handle(); |
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574 |
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575 // Check for static linked agent library |
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576 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], |
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577 size_t syms_len); |
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578 |
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579 // Find agent entry point |
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580 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib, |
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581 const char *syms[], size_t syms_len); |
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582 |
0 | 583 // Print out system information; they are called by fatal error handler. |
584 // Output format may be different on different platforms. | |
585 static void print_os_info(outputStream* st); | |
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586 static void print_os_info_brief(outputStream* st); |
0 | 587 static void print_cpu_info(outputStream* st); |
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588 static void pd_print_cpu_info(outputStream* st); |
0 | 589 static void print_memory_info(outputStream* st); |
590 static void print_dll_info(outputStream* st); | |
591 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); | |
592 static void print_context(outputStream* st, void* context); | |
1907 | 593 static void print_register_info(outputStream* st, void* context); |
0 | 594 static void print_siginfo(outputStream* st, void* siginfo); |
595 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); | |
596 static void print_date_and_time(outputStream* st); | |
597 | |
1907 | 598 static void print_location(outputStream* st, intptr_t x, bool verbose = false); |
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599 static size_t lasterror(char *buf, size_t len); |
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600 static int get_last_error(); |
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601 |
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602 // Determines whether the calling process is being debugged by a user-mode debugger. |
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603 static bool is_debugger_attached(); |
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604 |
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605 // wait for a key press if PauseAtExit is set |
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606 static void wait_for_keypress_at_exit(void); |
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607 |
0 | 608 // The following two functions are used by fatal error handler to trace |
609 // native (C) frames. They are not part of frame.hpp/frame.cpp because | |
610 // frame.hpp/cpp assume thread is JavaThread, and also because different | |
611 // OS/compiler may have different convention or provide different API to | |
612 // walk C frames. | |
613 // | |
614 // We don't attempt to become a debugger, so we only follow frames if that | |
615 // does not require a lookup in the unwind table, which is part of the binary | |
616 // file but may be unsafe to read after a fatal error. So on x86, we can | |
617 // only walk stack if %ebp is used as frame pointer; on ia64, it's not | |
618 // possible to walk C stack without having the unwind table. | |
619 static bool is_first_C_frame(frame *fr); | |
620 static frame get_sender_for_C_frame(frame *fr); | |
621 | |
622 // return current frame. pc() and sp() are set to NULL on failure. | |
623 static frame current_frame(); | |
624 | |
625 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); | |
626 | |
627 // returns a string to describe the exception/signal; | |
628 // returns NULL if exception_code is not an OS exception/signal. | |
629 static const char* exception_name(int exception_code, char* buf, size_t buflen); | |
630 | |
631 // Returns native Java library, loads if necessary | |
632 static void* native_java_library(); | |
633 | |
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634 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) |
0 | 635 static void jvm_path(char *buf, jint buflen); |
636 | |
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637 // Returns true if we are running in a headless jre. |
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638 static bool is_headless_jre(); |
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639 |
0 | 640 // JNI names |
641 static void print_jni_name_prefix_on(outputStream* st, int args_size); | |
642 static void print_jni_name_suffix_on(outputStream* st, int args_size); | |
643 | |
644 // File conventions | |
645 static const char* file_separator(); | |
646 static const char* line_separator(); | |
647 static const char* path_separator(); | |
648 | |
649 // Init os specific system properties values | |
650 static void init_system_properties_values(); | |
651 | |
652 // IO operations, non-JVM_ version. | |
653 static int stat(const char* path, struct stat* sbuf); | |
654 static bool dir_is_empty(const char* path); | |
655 | |
656 // IO operations on binary files | |
657 static int create_binary_file(const char* path, bool rewrite_existing); | |
658 static jlong current_file_offset(int fd); | |
659 static jlong seek_to_file_offset(int fd, jlong offset); | |
660 | |
661 // Thread Local Storage | |
662 static int allocate_thread_local_storage(); | |
663 static void thread_local_storage_at_put(int index, void* value); | |
664 static void* thread_local_storage_at(int index); | |
665 static void free_thread_local_storage(int index); | |
666 | |
20360 | 667 // Retrieve native stack frames. |
668 // Parameter: | |
669 // stack: an array to storage stack pointers. | |
670 // frames: size of above array. | |
671 // toSkip: number of stack frames to skip at the beginning. | |
672 // Return: number of stack frames captured. | |
673 static int get_native_stack(address* stack, int size, int toSkip = 0); | |
6197 | 674 |
0 | 675 // General allocation (must be MT-safe) |
20360 | 676 static void* malloc (size_t size, MEMFLAGS flags, const NativeCallStack& stack); |
677 static void* malloc (size_t size, MEMFLAGS flags); | |
678 static void* realloc (void *memblock, size_t size, MEMFLAGS flag, const NativeCallStack& stack); | |
679 static void* realloc (void *memblock, size_t size, MEMFLAGS flag); | |
680 | |
6197 | 681 static void free (void *memblock, MEMFLAGS flags = mtNone); |
0 | 682 static bool check_heap(bool force = false); // verify C heap integrity |
6197 | 683 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup |
0 | 684 |
685 #ifndef PRODUCT | |
2250 | 686 static julong num_mallocs; // # of calls to malloc/realloc |
687 static julong alloc_bytes; // # of bytes allocated | |
688 static julong num_frees; // # of calls to free | |
689 static julong free_bytes; // # of bytes freed | |
0 | 690 #endif |
691 | |
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692 // SocketInterface (ex HPI SocketInterface ) |
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693 static int socket(int domain, int type, int protocol); |
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694 static int socket_close(int fd); |
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695 static int socket_shutdown(int fd, int howto); |
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696 static int recv(int fd, char* buf, size_t nBytes, uint flags); |
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697 static int send(int fd, char* buf, size_t nBytes, uint flags); |
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698 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); |
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699 static int timeout(int fd, long timeout); |
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700 static int listen(int fd, int count); |
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701 static int connect(int fd, struct sockaddr* him, socklen_t len); |
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702 static int bind(int fd, struct sockaddr* him, socklen_t len); |
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703 static int accept(int fd, struct sockaddr* him, socklen_t* len); |
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704 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, |
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705 struct sockaddr* from, socklen_t* fromlen); |
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706 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); |
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707 static int sendto(int fd, char* buf, size_t len, uint flags, |
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708 struct sockaddr* to, socklen_t tolen); |
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709 static int socket_available(int fd, jint* pbytes); |
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710 |
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711 static int get_sock_opt(int fd, int level, int optname, |
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712 char* optval, socklen_t* optlen); |
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713 static int set_sock_opt(int fd, int level, int optname, |
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714 const char* optval, socklen_t optlen); |
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715 static int get_host_name(char* name, int namelen); |
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716 |
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717 static struct hostent* get_host_by_name(char* name); |
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718 |
0 | 719 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) |
720 static void signal_init(); | |
721 static void signal_init_pd(); | |
722 static void signal_notify(int signal_number); | |
723 static void* signal(int signal_number, void* handler); | |
724 static void signal_raise(int signal_number); | |
725 static int signal_wait(); | |
726 static int signal_lookup(); | |
727 static void* user_handler(); | |
728 static void terminate_signal_thread(); | |
729 static int sigexitnum_pd(); | |
730 | |
731 // random number generation | |
732 static long random(); // return 32bit pseudorandom number | |
733 static void init_random(long initval); // initialize random sequence | |
734 | |
735 // Structured OS Exception support | |
736 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
737 | |
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738 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits |
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739 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); |
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740 |
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741 // Get the default path to the core file |
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742 // Returns the length of the string |
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743 static int get_core_path(char* buffer, size_t bufferSize); |
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744 |
0 | 745 // JVMTI & JVM monitoring and management support |
746 // The thread_cpu_time() and current_thread_cpu_time() are only | |
747 // supported if is_thread_cpu_time_supported() returns true. | |
748 // They are not supported on Solaris T1. | |
749 | |
750 // Thread CPU Time - return the fast estimate on a platform | |
751 // On Solaris - call gethrvtime (fast) - user time only | |
752 // On Linux - fast clock_gettime where available - user+sys | |
753 // - otherwise: very slow /proc fs - user+sys | |
754 // On Windows - GetThreadTimes - user+sys | |
755 static jlong current_thread_cpu_time(); | |
756 static jlong thread_cpu_time(Thread* t); | |
757 | |
758 // Thread CPU Time with user_sys_cpu_time parameter. | |
759 // | |
760 // If user_sys_cpu_time is true, user+sys time is returned. | |
761 // Otherwise, only user time is returned | |
762 static jlong current_thread_cpu_time(bool user_sys_cpu_time); | |
763 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); | |
764 | |
765 // Return a bunch of info about the timers. | |
766 // Note that the returned info for these two functions may be different | |
767 // on some platforms | |
768 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
769 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
770 | |
771 static bool is_thread_cpu_time_supported(); | |
772 | |
773 // System loadavg support. Returns -1 if load average cannot be obtained. | |
774 static int loadavg(double loadavg[], int nelem); | |
775 | |
776 // Hook for os specific jvm options that we don't want to abort on seeing | |
777 static bool obsolete_option(const JavaVMOption *option); | |
778 | |
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779 // Extensions |
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780 #include "runtime/os_ext.hpp" |
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781 |
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782 public: |
11151 | 783 class CrashProtectionCallback : public StackObj { |
784 public: | |
785 virtual void call() = 0; | |
786 }; | |
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787 |
0 | 788 // Platform dependent stuff |
1972 | 789 #ifdef TARGET_OS_FAMILY_linux |
790 # include "os_linux.hpp" | |
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791 # include "os_posix.hpp" |
1972 | 792 #endif |
793 #ifdef TARGET_OS_FAMILY_solaris | |
794 # include "os_solaris.hpp" | |
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795 # include "os_posix.hpp" |
1972 | 796 #endif |
797 #ifdef TARGET_OS_FAMILY_windows | |
798 # include "os_windows.hpp" | |
799 #endif | |
14411 | 800 #ifdef TARGET_OS_FAMILY_aix |
801 # include "os_aix.hpp" | |
802 # include "os_posix.hpp" | |
803 #endif | |
3960 | 804 #ifdef TARGET_OS_FAMILY_bsd |
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805 # include "os_posix.hpp" |
3960 | 806 # include "os_bsd.hpp" |
807 #endif | |
1972 | 808 #ifdef TARGET_OS_ARCH_linux_x86 |
809 # include "os_linux_x86.hpp" | |
810 #endif | |
811 #ifdef TARGET_OS_ARCH_linux_sparc | |
812 # include "os_linux_sparc.hpp" | |
813 #endif | |
814 #ifdef TARGET_OS_ARCH_linux_zero | |
815 # include "os_linux_zero.hpp" | |
816 #endif | |
817 #ifdef TARGET_OS_ARCH_solaris_x86 | |
818 # include "os_solaris_x86.hpp" | |
819 #endif | |
820 #ifdef TARGET_OS_ARCH_solaris_sparc | |
821 # include "os_solaris_sparc.hpp" | |
822 #endif | |
823 #ifdef TARGET_OS_ARCH_windows_x86 | |
824 # include "os_windows_x86.hpp" | |
825 #endif | |
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826 #ifdef TARGET_OS_ARCH_linux_arm |
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827 # include "os_linux_arm.hpp" |
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828 #endif |
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829 #ifdef TARGET_OS_ARCH_linux_ppc |
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830 # include "os_linux_ppc.hpp" |
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831 #endif |
14411 | 832 #ifdef TARGET_OS_ARCH_aix_ppc |
833 # include "os_aix_ppc.hpp" | |
834 #endif | |
3960 | 835 #ifdef TARGET_OS_ARCH_bsd_x86 |
836 # include "os_bsd_x86.hpp" | |
837 #endif | |
838 #ifdef TARGET_OS_ARCH_bsd_zero | |
839 # include "os_bsd_zero.hpp" | |
840 #endif | |
1972 | 841 |
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842 public: |
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843 #ifndef PLATFORM_PRINT_NATIVE_STACK |
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844 // No platform-specific code for printing the native stack. |
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845 static bool platform_print_native_stack(outputStream* st, void* context, |
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846 char *buf, int buf_size) { |
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847 return false; |
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848 } |
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849 #endif |
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850 |
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851 // debugging support (mostly used by debug.cpp but also fatal error handler) |
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852 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address |
0 | 853 |
854 static bool dont_yield(); // when true, JVM_Yield() is nop | |
855 static void print_statistics(); | |
856 | |
857 // Thread priority helpers (implemented in OS-specific part) | |
858 static OSReturn set_native_priority(Thread* thread, int native_prio); | |
859 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); | |
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860 static int java_to_os_priority[CriticalPriority + 1]; |
0 | 861 // Hint to the underlying OS that a task switch would not be good. |
862 // Void return because it's a hint and can fail. | |
863 static void hint_no_preempt(); | |
864 | |
865 // Used at creation if requested by the diagnostic flag PauseAtStartup. | |
866 // Causes the VM to wait until an external stimulus has been applied | |
867 // (for Unix, that stimulus is a signal, for Windows, an external | |
868 // ResumeThread call) | |
869 static void pause(); | |
870 | |
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871 // Builds a platform dependent Agent_OnLoad_<libname> function name |
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872 // which is used to find statically linked in agents. |
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873 static char* build_agent_function_name(const char *sym, const char *cname, |
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874 bool is_absolute_path); |
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875 |
10405 | 876 class SuspendedThreadTaskContext { |
877 public: | |
878 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} | |
879 Thread* thread() const { return _thread; } | |
880 void* ucontext() const { return _ucontext; } | |
881 private: | |
882 Thread* _thread; | |
883 void* _ucontext; | |
884 }; | |
885 | |
886 class SuspendedThreadTask { | |
887 public: | |
888 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} | |
889 virtual ~SuspendedThreadTask() {} | |
890 void run(); | |
891 bool is_done() { return _done; } | |
892 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; | |
893 protected: | |
894 private: | |
895 void internal_do_task(); | |
896 Thread* _thread; | |
897 bool _done; | |
898 }; | |
899 | |
900 #ifndef TARGET_OS_FAMILY_windows | |
901 // Suspend/resume support | |
902 // Protocol: | |
903 // | |
904 // a thread starts in SR_RUNNING | |
905 // | |
906 // SR_RUNNING can go to | |
907 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it | |
908 // SR_SUSPEND_REQUEST can go to | |
909 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) | |
910 // * SR_SUSPENDED if the stopped thread receives the signal and switches state | |
911 // SR_SUSPENDED can go to | |
912 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume | |
913 // SR_WAKEUP_REQUEST can go to | |
914 // * SR_RUNNING when the stopped thread receives the signal | |
915 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) | |
916 class SuspendResume { | |
917 public: | |
918 enum State { | |
919 SR_RUNNING, | |
920 SR_SUSPEND_REQUEST, | |
921 SR_SUSPENDED, | |
922 SR_WAKEUP_REQUEST | |
923 }; | |
924 | |
925 private: | |
926 volatile State _state; | |
927 | |
928 private: | |
929 /* try to switch state from state "from" to state "to" | |
930 * returns the state set after the method is complete | |
931 */ | |
932 State switch_state(State from, State to); | |
933 | |
934 public: | |
935 SuspendResume() : _state(SR_RUNNING) { } | |
936 | |
937 State state() const { return _state; } | |
938 | |
939 State request_suspend() { | |
940 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); | |
941 } | |
942 | |
943 State cancel_suspend() { | |
944 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); | |
945 } | |
946 | |
947 State suspended() { | |
948 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); | |
949 } | |
950 | |
951 State request_wakeup() { | |
952 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); | |
953 } | |
954 | |
955 State running() { | |
956 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); | |
957 } | |
958 | |
959 bool is_running() const { | |
960 return _state == SR_RUNNING; | |
961 } | |
962 | |
963 bool is_suspend_request() const { | |
964 return _state == SR_SUSPEND_REQUEST; | |
965 } | |
966 | |
967 bool is_suspended() const { | |
968 return _state == SR_SUSPENDED; | |
969 } | |
970 }; | |
971 #endif | |
972 | |
973 | |
0 | 974 protected: |
975 static long _rand_seed; // seed for random number generator | |
976 static int _processor_count; // number of processors | |
977 | |
978 static char* format_boot_path(const char* format_string, | |
979 const char* home, | |
980 int home_len, | |
981 char fileSep, | |
982 char pathSep); | |
983 static bool set_boot_path(char fileSep, char pathSep); | |
691 | 984 static char** split_path(const char* path, int* n); |
11151 | 985 |
0 | 986 }; |
987 | |
988 // Note that "PAUSE" is almost always used with synchronization | |
989 // so arguably we should provide Atomic::SpinPause() instead | |
990 // of the global SpinPause() with C linkage. | |
991 // It'd also be eligible for inlining on many platforms. | |
992 | |
11127 | 993 extern "C" int SpinPause(); |
1972 | 994 |
995 #endif // SHARE_VM_RUNTIME_OS_HPP |