Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/os.hpp @ 11173:6b0fd0964b87
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 31 Jul 2013 11:00:54 +0200 |
parents | 836a62f43af9 af21010d1062 |
children | cefad50507d8 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 | |
3960 | 44 #ifdef TARGET_OS_FAMILY_bsd |
45 # include "jvm_bsd.h" | |
11151 | 46 # include <setjmp.h> |
3960 | 47 #endif |
1972 | 48 |
0 | 49 // os defines the interface to operating system; this includes traditional |
50 // OS services (time, I/O) as well as other functionality with system- | |
51 // dependent code. | |
52 | |
53 typedef void (*dll_func)(...); | |
54 | |
55 class Thread; | |
56 class JavaThread; | |
57 class Event; | |
58 class DLL; | |
59 class FileHandle; | |
141 | 60 template<class E> class GrowableArray; |
0 | 61 |
62 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose | |
63 | |
64 // Platform-independent error return values from OS functions | |
65 enum OSReturn { | |
66 OS_OK = 0, // Operation was successful | |
67 OS_ERR = -1, // Operation failed | |
68 OS_INTRPT = -2, // Operation was interrupted | |
69 OS_TIMEOUT = -3, // Operation timed out | |
70 OS_NOMEM = -5, // Operation failed for lack of memory | |
71 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource | |
72 }; | |
73 | |
74 enum ThreadPriority { // JLS 20.20.1-3 | |
75 NoPriority = -1, // Initial non-priority value | |
76 MinPriority = 1, // Minimum priority | |
77 NormPriority = 5, // Normal (non-daemon) priority | |
78 NearMaxPriority = 9, // High priority, used for VMThread | |
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79 MaxPriority = 10, // Highest priority, used for WatcherThread |
0 | 80 // ensures that VMThread doesn't starve profiler |
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81 CriticalPriority = 11 // Critical thread priority |
0 | 82 }; |
83 | |
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84 // Executable parameter flag for os::commit_memory() and |
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85 // os::commit_memory_or_exit(). |
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86 const bool ExecMem = true; |
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87 |
0 | 88 // Typedef for structured exception handling support |
89 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
90 | |
91 class os: AllStatic { | |
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92 public: |
0 | 93 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) |
94 | |
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95 private: |
0 | 96 static OSThread* _starting_thread; |
97 static address _polling_page; | |
98 static volatile int32_t * _mem_serialize_page; | |
99 static uintptr_t _serialize_page_mask; | |
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100 public: |
0 | 101 static size_t _page_sizes[page_sizes_max]; |
102 | |
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103 private: |
0 | 104 static void init_page_sizes(size_t default_page_size) { |
105 _page_sizes[0] = default_page_size; | |
106 _page_sizes[1] = 0; // sentinel | |
107 } | |
108 | |
6197 | 109 static char* pd_reserve_memory(size_t bytes, char* addr = 0, |
110 size_t alignment_hint = 0); | |
111 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); | |
112 static void pd_split_reserved_memory(char *base, size_t size, | |
113 size_t split, bool realloc); | |
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114 static bool pd_commit_memory(char* addr, size_t bytes, bool executable); |
6197 | 115 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
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116 bool executable); |
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117 // Same as pd_commit_memory() that either succeeds or calls |
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118 // vm_exit_out_of_memory() with the specified mesg. |
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119 static void pd_commit_memory_or_exit(char* addr, size_t bytes, |
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120 bool executable, const char* mesg); |
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121 static void pd_commit_memory_or_exit(char* addr, size_t size, |
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122 size_t alignment_hint, |
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123 bool executable, const char* mesg); |
6197 | 124 static bool pd_uncommit_memory(char* addr, size_t bytes); |
125 static bool pd_release_memory(char* addr, size_t bytes); | |
126 | |
127 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, | |
128 char *addr, size_t bytes, bool read_only = false, | |
129 bool allow_exec = false); | |
130 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, | |
131 char *addr, size_t bytes, bool read_only, | |
132 bool allow_exec); | |
133 static bool pd_unmap_memory(char *addr, size_t bytes); | |
134 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); | |
135 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); | |
136 | |
137 | |
0 | 138 public: |
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139 static void init(void); // Called before command line parsing |
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140 static jint init_2(void); // Called after command line parsing |
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141 static void init_globals(void) { // Called from init_globals() in init.cpp |
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142 init_globals_ext(); |
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143 } |
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144 static void init_3(void); // Called at the end of vm init |
0 | 145 |
146 // File names are case-insensitive on windows only | |
147 // Override me as needed | |
148 static int file_name_strcmp(const char* s1, const char* s2); | |
149 | |
150 static bool getenv(const char* name, char* buffer, int len); | |
151 static bool have_special_privileges(); | |
152 | |
153 static jlong javaTimeMillis(); | |
154 static jlong javaTimeNanos(); | |
155 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); | |
156 static void run_periodic_checks(); | |
157 | |
158 | |
159 // Returns the elapsed time in seconds since the vm started. | |
160 static double elapsedTime(); | |
161 | |
162 // Returns real time in seconds since an arbitrary point | |
163 // in the past. | |
164 static bool getTimesSecs(double* process_real_time, | |
165 double* process_user_time, | |
166 double* process_system_time); | |
167 | |
168 // Interface to the performance counter | |
169 static jlong elapsed_counter(); | |
170 static jlong elapsed_frequency(); | |
171 | |
342
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172 // The "virtual time" of a thread is the amount of time a thread has |
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173 // actually run. The first function indicates whether the OS supports |
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174 // this functionality for the current thread, and if so: |
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175 // * the second enables vtime tracking (if that is required). |
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176 // * the third tells whether vtime is enabled. |
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177 // * the fourth returns the elapsed virtual time for the current |
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178 // thread. |
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179 static bool supports_vtime(); |
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180 static bool enable_vtime(); |
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181 static bool vtime_enabled(); |
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182 static double elapsedVTime(); |
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183 |
0 | 184 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). |
185 // It is MT safe, but not async-safe, as reading time zone | |
186 // information may require a lock on some platforms. | |
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187 static char* local_time_string(char *buf, size_t buflen); |
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188 static struct tm* localtime_pd (const time_t* clock, struct tm* res); |
0 | 189 // Fill in buffer with current local time as an ISO-8601 string. |
190 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. | |
191 // Returns buffer, or NULL if it failed. | |
192 static char* iso8601_time(char* buffer, size_t buffer_length); | |
193 | |
194 // Interface for detecting multiprocessor system | |
195 static inline bool is_MP() { | |
196 assert(_processor_count > 0, "invalid processor count"); | |
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197 return _processor_count > 1 || AssumeMP; |
0 | 198 } |
199 static julong available_memory(); | |
200 static julong physical_memory(); | |
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201 static bool has_allocatable_memory_limit(julong* limit); |
0 | 202 static bool is_server_class_machine(); |
203 | |
204 // number of CPUs | |
205 static int processor_count() { | |
206 return _processor_count; | |
207 } | |
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208 static void set_processor_count(int count) { _processor_count = count; } |
0 | 209 |
210 // Returns the number of CPUs this process is currently allowed to run on. | |
211 // Note that on some OSes this can change dynamically. | |
212 static int active_processor_count(); | |
213 | |
214 // Bind processes to processors. | |
215 // This is a two step procedure: | |
216 // first you generate a distribution of processes to processors, | |
217 // then you bind processes according to that distribution. | |
218 // Compute a distribution for number of processes to processors. | |
219 // Stores the processor id's into the distribution array argument. | |
220 // Returns true if it worked, false if it didn't. | |
221 static bool distribute_processes(uint length, uint* distribution); | |
222 // Binds the current process to a processor. | |
223 // Returns true if it worked, false if it didn't. | |
224 static bool bind_to_processor(uint processor_id); | |
225 | |
4006 | 226 // Give a name to the current thread. |
227 static void set_native_thread_name(const char *name); | |
228 | |
0 | 229 // Interface for stack banging (predetect possible stack overflow for |
230 // exception processing) There are guard pages, and above that shadow | |
231 // pages for stack overflow checking. | |
232 static bool uses_stack_guard_pages(); | |
233 static bool allocate_stack_guard_pages(); | |
234 static void bang_stack_shadow_pages(); | |
235 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); | |
236 | |
237 // OS interface to Virtual Memory | |
238 | |
239 // Return the default page size. | |
240 static int vm_page_size(); | |
241 | |
242 // Return the page size to use for a region of memory. The min_pages argument | |
243 // is a hint intended to limit fragmentation; it says the returned page size | |
244 // should be <= region_max_size / min_pages. Because min_pages is a hint, | |
245 // this routine may return a size larger than region_max_size / min_pages. | |
246 // | |
247 // The current implementation ignores min_pages if a larger page size is an | |
248 // exact multiple of both region_min_size and region_max_size. This allows | |
249 // larger pages to be used when doing so would not cause fragmentation; in | |
250 // particular, a single page can be used when region_min_size == | |
251 // region_max_size == a supported page size. | |
252 static size_t page_size_for_region(size_t region_min_size, | |
253 size_t region_max_size, | |
254 uint min_pages); | |
255 | |
3859 | 256 // Methods for tracing page sizes returned by the above method; enabled by |
0 | 257 // TracePageSizes. The region_{min,max}_size parameters should be the values |
258 // passed to page_size_for_region() and page_size should be the result of that | |
259 // call. The (optional) base and size parameters should come from the | |
260 // ReservedSpace base() and size() methods. | |
3859 | 261 static void trace_page_sizes(const char* str, const size_t* page_sizes, |
262 int count) PRODUCT_RETURN; | |
0 | 263 static void trace_page_sizes(const char* str, const size_t region_min_size, |
264 const size_t region_max_size, | |
265 const size_t page_size, | |
266 const char* base = NULL, | |
267 const size_t size = 0) PRODUCT_RETURN; | |
268 | |
269 static int vm_allocation_granularity(); | |
270 static char* reserve_memory(size_t bytes, char* addr = 0, | |
271 size_t alignment_hint = 0); | |
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272 static char* reserve_memory(size_t bytes, char* addr, |
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273 size_t alignment_hint, MEMFLAGS flags); |
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274 static char* reserve_memory_aligned(size_t size, size_t alignment); |
0 | 275 static char* attempt_reserve_memory_at(size_t bytes, char* addr); |
276 static void split_reserved_memory(char *base, size_t size, | |
277 size_t split, bool realloc); | |
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278 static bool commit_memory(char* addr, size_t bytes, bool executable); |
656 | 279 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, |
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280 bool executable); |
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281 // Same as commit_memory() that either succeeds or calls |
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282 // vm_exit_out_of_memory() with the specified mesg. |
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283 static void commit_memory_or_exit(char* addr, size_t bytes, |
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284 bool executable, const char* mesg); |
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285 static void commit_memory_or_exit(char* addr, size_t size, |
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286 size_t alignment_hint, |
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287 bool executable, const char* mesg); |
0 | 288 static bool uncommit_memory(char* addr, size_t bytes); |
289 static bool release_memory(char* addr, size_t bytes); | |
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290 |
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291 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; |
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292 static bool protect_memory(char* addr, size_t bytes, ProtType prot, |
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293 bool is_committed = true); |
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294 |
0 | 295 static bool guard_memory(char* addr, size_t bytes); |
296 static bool unguard_memory(char* addr, size_t bytes); | |
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297 static bool create_stack_guard_pages(char* addr, size_t bytes); |
6197 | 298 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); |
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299 static bool remove_stack_guard_pages(char* addr, size_t bytes); |
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300 |
0 | 301 static char* map_memory(int fd, const char* file_name, size_t file_offset, |
302 char *addr, size_t bytes, bool read_only = false, | |
303 bool allow_exec = false); | |
304 static char* remap_memory(int fd, const char* file_name, size_t file_offset, | |
305 char *addr, size_t bytes, bool read_only, | |
306 bool allow_exec); | |
307 static bool unmap_memory(char *addr, size_t bytes); | |
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308 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); |
0 | 309 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); |
310 | |
311 // NUMA-specific interface | |
141 | 312 static bool numa_has_static_binding(); |
313 static bool numa_has_group_homing(); | |
314 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); | |
0 | 315 static void numa_make_global(char *addr, size_t bytes); |
316 static size_t numa_get_groups_num(); | |
317 static size_t numa_get_leaf_groups(int *ids, size_t size); | |
318 static bool numa_topology_changed(); | |
319 static int numa_get_group_id(); | |
320 | |
321 // Page manipulation | |
322 struct page_info { | |
323 size_t size; | |
324 int lgrp_id; | |
325 }; | |
326 static bool get_page_info(char *start, page_info* info); | |
327 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); | |
328 | |
329 static char* non_memory_address_word(); | |
330 // reserve, commit and pin the entire memory region | |
656 | 331 static char* reserve_memory_special(size_t size, char* addr = NULL, |
332 bool executable = false); | |
0 | 333 static bool release_memory_special(char* addr, size_t bytes); |
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334 static void large_page_init(); |
0 | 335 static size_t large_page_size(); |
336 static bool can_commit_large_page_memory(); | |
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337 static bool can_execute_large_page_memory(); |
0 | 338 |
339 // OS interface to polling page | |
340 static address get_polling_page() { return _polling_page; } | |
341 static void set_polling_page(address page) { _polling_page = page; } | |
342 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } | |
343 static void make_polling_page_unreadable(); | |
344 static void make_polling_page_readable(); | |
345 | |
346 // Routines used to serialize the thread state without using membars | |
347 static void serialize_thread_states(); | |
348 | |
349 // Since we write to the serialize page from every thread, we | |
350 // want stores to be on unique cache lines whenever possible | |
351 // in order to minimize CPU cross talk. We pre-compute the | |
352 // amount to shift the thread* to make this offset unique to | |
353 // each thread. | |
354 static int get_serialize_page_shift_count() { | |
355 return SerializePageShiftCount; | |
356 } | |
357 | |
358 static void set_serialize_page_mask(uintptr_t mask) { | |
359 _serialize_page_mask = mask; | |
360 } | |
361 | |
362 static unsigned int get_serialize_page_mask() { | |
363 return _serialize_page_mask; | |
364 } | |
365 | |
366 static void set_memory_serialize_page(address page); | |
367 | |
368 static address get_memory_serialize_page() { | |
369 return (address)_mem_serialize_page; | |
370 } | |
371 | |
372 static inline void write_memory_serialize_page(JavaThread *thread) { | |
373 uintptr_t page_offset = ((uintptr_t)thread >> | |
374 get_serialize_page_shift_count()) & | |
375 get_serialize_page_mask(); | |
376 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; | |
377 } | |
378 | |
379 static bool is_memory_serialize_page(JavaThread *thread, address addr) { | |
380 if (UseMembar) return false; | |
1078 | 381 // Previously this function calculated the exact address of this |
382 // thread's serialize page, and checked if the faulting address | |
383 // was equal. However, some platforms mask off faulting addresses | |
384 // to the page size, so now we just check that the address is | |
385 // within the page. This makes the thread argument unnecessary, | |
386 // but we retain the NULL check to preserve existing behaviour. | |
0 | 387 if (thread == NULL) return false; |
1078 | 388 address page = (address) _mem_serialize_page; |
389 return addr >= page && addr < (page + os::vm_page_size()); | |
0 | 390 } |
391 | |
392 static void block_on_serialize_page_trap(); | |
393 | |
394 // threads | |
395 | |
396 enum ThreadType { | |
397 vm_thread, | |
398 cgc_thread, // Concurrent GC thread | |
399 pgc_thread, // Parallel GC thread | |
400 java_thread, | |
401 compiler_thread, | |
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402 watcher_thread, |
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403 os_thread |
0 | 404 }; |
405 | |
406 static bool create_thread(Thread* thread, | |
407 ThreadType thr_type, | |
408 size_t stack_size = 0); | |
409 static bool create_main_thread(JavaThread* thread); | |
410 static bool create_attached_thread(JavaThread* thread); | |
411 static void pd_start_thread(Thread* thread); | |
412 static void start_thread(Thread* thread); | |
413 | |
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414 static void initialize_thread(Thread* thr); |
0 | 415 static void free_thread(OSThread* osthread); |
416 | |
417 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit | |
418 static intx current_thread_id(); | |
419 static int current_process_id(); | |
420 static int sleep(Thread* thread, jlong ms, bool interruptable); | |
421 static int naked_sleep(); | |
422 static void infinite_sleep(); // never returns, use with CAUTION | |
423 static void yield(); // Yields to all threads with same priority | |
424 enum YieldResult { | |
425 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran | |
426 YIELD_NONEREADY = 0, // No other runnable/ready threads. | |
427 // platform-specific yield return immediately | |
428 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY | |
429 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" | |
430 // yield that can be used in lieu of blocking. | |
431 } ; | |
432 static YieldResult NakedYield () ; | |
433 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority | |
434 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing | |
435 static OSReturn set_priority(Thread* thread, ThreadPriority priority); | |
436 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); | |
437 | |
438 static void interrupt(Thread* thread); | |
439 static bool is_interrupted(Thread* thread, bool clear_interrupted); | |
440 | |
441 static int pd_self_suspend_thread(Thread* thread); | |
442 | |
443 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); | |
444 static frame fetch_frame_from_context(void* ucVoid); | |
445 | |
446 static ExtendedPC get_thread_pc(Thread *thread); | |
447 static void breakpoint(); | |
448 | |
449 static address current_stack_pointer(); | |
450 static address current_stack_base(); | |
451 static size_t current_stack_size(); | |
452 | |
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453 static void verify_stack_alignment() PRODUCT_RETURN; |
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454 |
0 | 455 static int message_box(const char* title, const char* message); |
456 static char* do_you_want_to_debug(const char* message); | |
457 | |
458 // run cmd in a separate process and return its exit code; or -1 on failures | |
459 static int fork_and_exec(char *cmd); | |
460 | |
461 // Set file to send error reports. | |
462 static void set_error_file(const char *logfile); | |
463 | |
464 // os::exit() is merged with vm_exit() | |
465 // static void exit(int num); | |
466 | |
467 // Terminate the VM, but don't exit the process | |
468 static void shutdown(); | |
469 | |
470 // Terminate with an error. Default is to generate a core file on platforms | |
471 // that support such things. This calls shutdown() and then aborts. | |
472 static void abort(bool dump_core = true); | |
473 | |
474 // Die immediately, no exit hook, no abort hook, no cleanup. | |
475 static void die(); | |
476 | |
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477 // File i/o operations |
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478 static const int default_file_open_flags(); |
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479 static int open(const char *path, int oflag, int mode); |
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480 static FILE* open(int fd, const char* mode); |
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481 static int close(int fd); |
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482 static jlong lseek(int fd, jlong offset, int whence); |
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483 static char* native_path(char *path); |
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484 static int ftruncate(int fd, jlong length); |
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485 static int fsync(int fd); |
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486 static int available(int fd, jlong *bytes); |
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487 |
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488 //File i/o operations |
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489 |
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490 static size_t read(int fd, void *buf, unsigned int nBytes); |
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491 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); |
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492 static size_t write(int fd, const void *buf, unsigned int nBytes); |
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493 |
0 | 494 // Reading directories. |
495 static DIR* opendir(const char* dirname); | |
496 static int readdir_buf_size(const char *path); | |
497 static struct dirent* readdir(DIR* dirp, dirent* dbuf); | |
498 static int closedir(DIR* dirp); | |
499 | |
500 // Dynamic library extension | |
501 static const char* dll_file_extension(); | |
502 | |
503 static const char* get_temp_directory(); | |
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504 static const char* get_current_directory(char *buf, size_t buflen); |
0 | 505 |
242 | 506 // Builds a platform-specific full library path given a ld path and lib name |
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507 // Returns true if buffer contains full path to existing file, false otherwise |
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508 static bool dll_build_name(char* buffer, size_t size, |
242 | 509 const char* pathname, const char* fname); |
510 | |
0 | 511 // Symbol lookup, find nearest function name; basically it implements |
512 // dladdr() for all platforms. Name of the nearest function is copied | |
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513 // to buf. Distance from its base address is optionally returned as offset. |
0 | 514 // If function name is not found, buf[0] is set to '\0' and offset is |
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515 // set to -1 (if offset is non-NULL). |
0 | 516 static bool dll_address_to_function_name(address addr, char* buf, |
517 int buflen, int* offset); | |
518 | |
519 // Locate DLL/DSO. On success, full path of the library is copied to | |
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520 // buf, and offset is optionally set to be the distance between addr |
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521 // and the library's base address. On failure, buf[0] is set to '\0' |
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522 // and offset is set to -1 (if offset is non-NULL). |
0 | 523 static bool dll_address_to_library_name(address addr, char* buf, |
524 int buflen, int* offset); | |
525 | |
526 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. | |
527 static bool address_is_in_vm(address addr); | |
528 | |
529 // Loads .dll/.so and | |
530 // in case of error it checks if .dll/.so was built for the | |
531 // same architecture as Hotspot is running on | |
532 static void* dll_load(const char *name, char *ebuf, int ebuflen); | |
533 | |
242 | 534 // lookup symbol in a shared library |
535 static void* dll_lookup(void* handle, const char* name); | |
536 | |
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537 // Unload library |
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538 static void dll_unload(void *lib); |
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539 |
0 | 540 // Print out system information; they are called by fatal error handler. |
541 // Output format may be different on different platforms. | |
542 static void print_os_info(outputStream* st); | |
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543 static void print_os_info_brief(outputStream* st); |
0 | 544 static void print_cpu_info(outputStream* st); |
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545 static void pd_print_cpu_info(outputStream* st); |
0 | 546 static void print_memory_info(outputStream* st); |
547 static void print_dll_info(outputStream* st); | |
548 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); | |
549 static void print_context(outputStream* st, void* context); | |
1907 | 550 static void print_register_info(outputStream* st, void* context); |
0 | 551 static void print_siginfo(outputStream* st, void* siginfo); |
552 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); | |
553 static void print_date_and_time(outputStream* st); | |
554 | |
1907 | 555 static void print_location(outputStream* st, intptr_t x, bool verbose = false); |
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556 static size_t lasterror(char *buf, size_t len); |
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557 static int get_last_error(); |
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558 |
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559 // Determines whether the calling process is being debugged by a user-mode debugger. |
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560 static bool is_debugger_attached(); |
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561 |
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562 // wait for a key press if PauseAtExit is set |
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563 static void wait_for_keypress_at_exit(void); |
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564 |
0 | 565 // The following two functions are used by fatal error handler to trace |
566 // native (C) frames. They are not part of frame.hpp/frame.cpp because | |
567 // frame.hpp/cpp assume thread is JavaThread, and also because different | |
568 // OS/compiler may have different convention or provide different API to | |
569 // walk C frames. | |
570 // | |
571 // We don't attempt to become a debugger, so we only follow frames if that | |
572 // does not require a lookup in the unwind table, which is part of the binary | |
573 // file but may be unsafe to read after a fatal error. So on x86, we can | |
574 // only walk stack if %ebp is used as frame pointer; on ia64, it's not | |
575 // possible to walk C stack without having the unwind table. | |
576 static bool is_first_C_frame(frame *fr); | |
577 static frame get_sender_for_C_frame(frame *fr); | |
578 | |
579 // return current frame. pc() and sp() are set to NULL on failure. | |
580 static frame current_frame(); | |
581 | |
582 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); | |
583 | |
584 // returns a string to describe the exception/signal; | |
585 // returns NULL if exception_code is not an OS exception/signal. | |
586 static const char* exception_name(int exception_code, char* buf, size_t buflen); | |
587 | |
588 // Returns native Java library, loads if necessary | |
589 static void* native_java_library(); | |
590 | |
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591 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) |
0 | 592 static void jvm_path(char *buf, jint buflen); |
593 | |
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594 // Returns true if we are running in a headless jre. |
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595 static bool is_headless_jre(); |
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596 |
0 | 597 // JNI names |
598 static void print_jni_name_prefix_on(outputStream* st, int args_size); | |
599 static void print_jni_name_suffix_on(outputStream* st, int args_size); | |
600 | |
601 // File conventions | |
602 static const char* file_separator(); | |
603 static const char* line_separator(); | |
604 static const char* path_separator(); | |
605 | |
606 // Init os specific system properties values | |
607 static void init_system_properties_values(); | |
608 | |
609 // IO operations, non-JVM_ version. | |
610 static int stat(const char* path, struct stat* sbuf); | |
611 static bool dir_is_empty(const char* path); | |
612 | |
613 // IO operations on binary files | |
614 static int create_binary_file(const char* path, bool rewrite_existing); | |
615 static jlong current_file_offset(int fd); | |
616 static jlong seek_to_file_offset(int fd, jlong offset); | |
617 | |
618 // Thread Local Storage | |
619 static int allocate_thread_local_storage(); | |
620 static void thread_local_storage_at_put(int index, void* value); | |
621 static void* thread_local_storage_at(int index); | |
622 static void free_thread_local_storage(int index); | |
623 | |
6197 | 624 // Stack walk |
625 static address get_caller_pc(int n = 0); | |
626 | |
0 | 627 // General allocation (must be MT-safe) |
6197 | 628 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0); |
629 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0); | |
630 static void free (void *memblock, MEMFLAGS flags = mtNone); | |
0 | 631 static bool check_heap(bool force = false); // verify C heap integrity |
6197 | 632 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup |
0 | 633 |
634 #ifndef PRODUCT | |
2250 | 635 static julong num_mallocs; // # of calls to malloc/realloc |
636 static julong alloc_bytes; // # of bytes allocated | |
637 static julong num_frees; // # of calls to free | |
638 static julong free_bytes; // # of bytes freed | |
0 | 639 #endif |
640 | |
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641 // SocketInterface (ex HPI SocketInterface ) |
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642 static int socket(int domain, int type, int protocol); |
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643 static int socket_close(int fd); |
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644 static int socket_shutdown(int fd, int howto); |
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645 static int recv(int fd, char* buf, size_t nBytes, uint flags); |
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646 static int send(int fd, char* buf, size_t nBytes, uint flags); |
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647 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); |
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648 static int timeout(int fd, long timeout); |
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649 static int listen(int fd, int count); |
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650 static int connect(int fd, struct sockaddr* him, socklen_t len); |
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651 static int bind(int fd, struct sockaddr* him, socklen_t len); |
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652 static int accept(int fd, struct sockaddr* him, socklen_t* len); |
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653 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, |
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654 struct sockaddr* from, socklen_t* fromlen); |
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655 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); |
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656 static int sendto(int fd, char* buf, size_t len, uint flags, |
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657 struct sockaddr* to, socklen_t tolen); |
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658 static int socket_available(int fd, jint* pbytes); |
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659 |
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660 static int get_sock_opt(int fd, int level, int optname, |
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661 char* optval, socklen_t* optlen); |
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662 static int set_sock_opt(int fd, int level, int optname, |
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663 const char* optval, socklen_t optlen); |
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664 static int get_host_name(char* name, int namelen); |
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665 |
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666 static struct hostent* get_host_by_name(char* name); |
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667 |
0 | 668 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) |
669 static void signal_init(); | |
670 static void signal_init_pd(); | |
671 static void signal_notify(int signal_number); | |
672 static void* signal(int signal_number, void* handler); | |
673 static void signal_raise(int signal_number); | |
674 static int signal_wait(); | |
675 static int signal_lookup(); | |
676 static void* user_handler(); | |
677 static void terminate_signal_thread(); | |
678 static int sigexitnum_pd(); | |
679 | |
680 // random number generation | |
681 static long random(); // return 32bit pseudorandom number | |
682 static void init_random(long initval); // initialize random sequence | |
683 | |
684 // Structured OS Exception support | |
685 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
686 | |
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687 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits |
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688 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); |
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689 |
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690 // Get the default path to the core file |
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691 // Returns the length of the string |
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692 static int get_core_path(char* buffer, size_t bufferSize); |
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693 |
0 | 694 // JVMTI & JVM monitoring and management support |
695 // The thread_cpu_time() and current_thread_cpu_time() are only | |
696 // supported if is_thread_cpu_time_supported() returns true. | |
697 // They are not supported on Solaris T1. | |
698 | |
699 // Thread CPU Time - return the fast estimate on a platform | |
700 // On Solaris - call gethrvtime (fast) - user time only | |
701 // On Linux - fast clock_gettime where available - user+sys | |
702 // - otherwise: very slow /proc fs - user+sys | |
703 // On Windows - GetThreadTimes - user+sys | |
704 static jlong current_thread_cpu_time(); | |
705 static jlong thread_cpu_time(Thread* t); | |
706 | |
707 // Thread CPU Time with user_sys_cpu_time parameter. | |
708 // | |
709 // If user_sys_cpu_time is true, user+sys time is returned. | |
710 // Otherwise, only user time is returned | |
711 static jlong current_thread_cpu_time(bool user_sys_cpu_time); | |
712 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); | |
713 | |
714 // Return a bunch of info about the timers. | |
715 // Note that the returned info for these two functions may be different | |
716 // on some platforms | |
717 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
718 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
719 | |
720 static bool is_thread_cpu_time_supported(); | |
721 | |
722 // System loadavg support. Returns -1 if load average cannot be obtained. | |
723 static int loadavg(double loadavg[], int nelem); | |
724 | |
725 // Hook for os specific jvm options that we don't want to abort on seeing | |
726 static bool obsolete_option(const JavaVMOption *option); | |
727 | |
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728 // Read file line by line. If line is longer than bsize, |
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729 // rest of line is skipped. Returns number of bytes read or -1 on EOF |
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730 static int get_line_chars(int fd, char *buf, const size_t bsize); |
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731 |
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732 // Extensions |
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733 #include "runtime/os_ext.hpp" |
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734 |
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735 public: |
11151 | 736 class CrashProtectionCallback : public StackObj { |
737 public: | |
738 virtual void call() = 0; | |
739 }; | |
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740 |
0 | 741 // Platform dependent stuff |
1972 | 742 #ifdef TARGET_OS_FAMILY_linux |
743 # include "os_linux.hpp" | |
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744 # include "os_posix.hpp" |
1972 | 745 #endif |
746 #ifdef TARGET_OS_FAMILY_solaris | |
747 # include "os_solaris.hpp" | |
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748 # include "os_posix.hpp" |
1972 | 749 #endif |
750 #ifdef TARGET_OS_FAMILY_windows | |
751 # include "os_windows.hpp" | |
752 #endif | |
3960 | 753 #ifdef TARGET_OS_FAMILY_bsd |
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754 # include "os_posix.hpp" |
3960 | 755 # include "os_bsd.hpp" |
756 #endif | |
1972 | 757 #ifdef TARGET_OS_ARCH_linux_x86 |
758 # include "os_linux_x86.hpp" | |
759 #endif | |
760 #ifdef TARGET_OS_ARCH_linux_sparc | |
761 # include "os_linux_sparc.hpp" | |
762 #endif | |
763 #ifdef TARGET_OS_ARCH_linux_zero | |
764 # include "os_linux_zero.hpp" | |
765 #endif | |
766 #ifdef TARGET_OS_ARCH_solaris_x86 | |
767 # include "os_solaris_x86.hpp" | |
768 #endif | |
769 #ifdef TARGET_OS_ARCH_solaris_sparc | |
770 # include "os_solaris_sparc.hpp" | |
771 #endif | |
772 #ifdef TARGET_OS_ARCH_windows_x86 | |
773 # include "os_windows_x86.hpp" | |
774 #endif | |
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775 #ifdef TARGET_OS_ARCH_linux_arm |
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776 # include "os_linux_arm.hpp" |
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777 #endif |
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778 #ifdef TARGET_OS_ARCH_linux_ppc |
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779 # include "os_linux_ppc.hpp" |
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780 #endif |
3960 | 781 #ifdef TARGET_OS_ARCH_bsd_x86 |
782 # include "os_bsd_x86.hpp" | |
783 #endif | |
784 #ifdef TARGET_OS_ARCH_bsd_zero | |
785 # include "os_bsd_zero.hpp" | |
786 #endif | |
1972 | 787 |
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788 public: |
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789 // debugging support (mostly used by debug.cpp but also fatal error handler) |
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790 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address |
0 | 791 |
792 static bool dont_yield(); // when true, JVM_Yield() is nop | |
793 static void print_statistics(); | |
794 | |
795 // Thread priority helpers (implemented in OS-specific part) | |
796 static OSReturn set_native_priority(Thread* thread, int native_prio); | |
797 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); | |
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798 static int java_to_os_priority[CriticalPriority + 1]; |
0 | 799 // Hint to the underlying OS that a task switch would not be good. |
800 // Void return because it's a hint and can fail. | |
801 static void hint_no_preempt(); | |
802 | |
803 // Used at creation if requested by the diagnostic flag PauseAtStartup. | |
804 // Causes the VM to wait until an external stimulus has been applied | |
805 // (for Unix, that stimulus is a signal, for Windows, an external | |
806 // ResumeThread call) | |
807 static void pause(); | |
808 | |
10405 | 809 class SuspendedThreadTaskContext { |
810 public: | |
811 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} | |
812 Thread* thread() const { return _thread; } | |
813 void* ucontext() const { return _ucontext; } | |
814 private: | |
815 Thread* _thread; | |
816 void* _ucontext; | |
817 }; | |
818 | |
819 class SuspendedThreadTask { | |
820 public: | |
821 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} | |
822 virtual ~SuspendedThreadTask() {} | |
823 void run(); | |
824 bool is_done() { return _done; } | |
825 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; | |
826 protected: | |
827 private: | |
828 void internal_do_task(); | |
829 Thread* _thread; | |
830 bool _done; | |
831 }; | |
832 | |
833 #ifndef TARGET_OS_FAMILY_windows | |
834 // Suspend/resume support | |
835 // Protocol: | |
836 // | |
837 // a thread starts in SR_RUNNING | |
838 // | |
839 // SR_RUNNING can go to | |
840 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it | |
841 // SR_SUSPEND_REQUEST can go to | |
842 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) | |
843 // * SR_SUSPENDED if the stopped thread receives the signal and switches state | |
844 // SR_SUSPENDED can go to | |
845 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume | |
846 // SR_WAKEUP_REQUEST can go to | |
847 // * SR_RUNNING when the stopped thread receives the signal | |
848 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) | |
849 class SuspendResume { | |
850 public: | |
851 enum State { | |
852 SR_RUNNING, | |
853 SR_SUSPEND_REQUEST, | |
854 SR_SUSPENDED, | |
855 SR_WAKEUP_REQUEST | |
856 }; | |
857 | |
858 private: | |
859 volatile State _state; | |
860 | |
861 private: | |
862 /* try to switch state from state "from" to state "to" | |
863 * returns the state set after the method is complete | |
864 */ | |
865 State switch_state(State from, State to); | |
866 | |
867 public: | |
868 SuspendResume() : _state(SR_RUNNING) { } | |
869 | |
870 State state() const { return _state; } | |
871 | |
872 State request_suspend() { | |
873 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); | |
874 } | |
875 | |
876 State cancel_suspend() { | |
877 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); | |
878 } | |
879 | |
880 State suspended() { | |
881 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); | |
882 } | |
883 | |
884 State request_wakeup() { | |
885 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); | |
886 } | |
887 | |
888 State running() { | |
889 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); | |
890 } | |
891 | |
892 bool is_running() const { | |
893 return _state == SR_RUNNING; | |
894 } | |
895 | |
896 bool is_suspend_request() const { | |
897 return _state == SR_SUSPEND_REQUEST; | |
898 } | |
899 | |
900 bool is_suspended() const { | |
901 return _state == SR_SUSPENDED; | |
902 } | |
903 }; | |
904 #endif | |
905 | |
906 | |
0 | 907 protected: |
908 static long _rand_seed; // seed for random number generator | |
909 static int _processor_count; // number of processors | |
910 | |
911 static char* format_boot_path(const char* format_string, | |
912 const char* home, | |
913 int home_len, | |
914 char fileSep, | |
915 char pathSep); | |
916 static bool set_boot_path(char fileSep, char pathSep); | |
691 | 917 static char** split_path(const char* path, int* n); |
11151 | 918 |
0 | 919 }; |
920 | |
921 // Note that "PAUSE" is almost always used with synchronization | |
922 // so arguably we should provide Atomic::SpinPause() instead | |
923 // of the global SpinPause() with C linkage. | |
924 // It'd also be eligible for inlining on many platforms. | |
925 | |
11127 | 926 extern "C" int SpinPause(); |
1972 | 927 |
928 #endif // SHARE_VM_RUNTIME_OS_HPP |