Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/os.hpp @ 12182:bb57d48691f5
Merge
author | tschatzl |
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date | Thu, 05 Sep 2013 14:15:54 +0200 |
parents | c636758ea616 |
children | 38f750491293 40136aa2cdb1 69f26e8e09f9 |
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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 |
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49 class AgentLibrary; |
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50 |
0 | 51 // os defines the interface to operating system; this includes traditional |
52 // OS services (time, I/O) as well as other functionality with system- | |
53 // dependent code. | |
54 | |
55 typedef void (*dll_func)(...); | |
56 | |
57 class Thread; | |
58 class JavaThread; | |
59 class Event; | |
60 class DLL; | |
61 class FileHandle; | |
141 | 62 template<class E> class GrowableArray; |
0 | 63 |
64 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose | |
65 | |
66 // Platform-independent error return values from OS functions | |
67 enum OSReturn { | |
68 OS_OK = 0, // Operation was successful | |
69 OS_ERR = -1, // Operation failed | |
70 OS_INTRPT = -2, // Operation was interrupted | |
71 OS_TIMEOUT = -3, // Operation timed out | |
72 OS_NOMEM = -5, // Operation failed for lack of memory | |
73 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource | |
74 }; | |
75 | |
76 enum ThreadPriority { // JLS 20.20.1-3 | |
77 NoPriority = -1, // Initial non-priority value | |
78 MinPriority = 1, // Minimum priority | |
79 NormPriority = 5, // Normal (non-daemon) priority | |
80 NearMaxPriority = 9, // High priority, used for VMThread | |
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81 MaxPriority = 10, // Highest priority, used for WatcherThread |
0 | 82 // ensures that VMThread doesn't starve profiler |
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83 CriticalPriority = 11 // Critical thread priority |
0 | 84 }; |
85 | |
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86 // Executable parameter flag for os::commit_memory() and |
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87 // os::commit_memory_or_exit(). |
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88 const bool ExecMem = true; |
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89 |
0 | 90 // Typedef for structured exception handling support |
91 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
92 | |
93 class os: AllStatic { | |
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94 public: |
0 | 95 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) |
96 | |
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97 private: |
0 | 98 static OSThread* _starting_thread; |
99 static address _polling_page; | |
100 static volatile int32_t * _mem_serialize_page; | |
101 static uintptr_t _serialize_page_mask; | |
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102 public: |
0 | 103 static size_t _page_sizes[page_sizes_max]; |
104 | |
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105 private: |
0 | 106 static void init_page_sizes(size_t default_page_size) { |
107 _page_sizes[0] = default_page_size; | |
108 _page_sizes[1] = 0; // sentinel | |
109 } | |
110 | |
6197 | 111 static char* pd_reserve_memory(size_t bytes, char* addr = 0, |
112 size_t alignment_hint = 0); | |
113 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); | |
114 static void pd_split_reserved_memory(char *base, size_t size, | |
115 size_t split, bool realloc); | |
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116 static bool pd_commit_memory(char* addr, size_t bytes, bool executable); |
6197 | 117 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
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118 bool executable); |
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119 // Same as pd_commit_memory() that either succeeds or calls |
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120 // vm_exit_out_of_memory() with the specified mesg. |
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121 static void pd_commit_memory_or_exit(char* addr, size_t bytes, |
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122 bool executable, const char* mesg); |
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123 static void pd_commit_memory_or_exit(char* addr, size_t size, |
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124 size_t alignment_hint, |
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125 bool executable, const char* mesg); |
6197 | 126 static bool pd_uncommit_memory(char* addr, size_t bytes); |
127 static bool pd_release_memory(char* addr, size_t bytes); | |
128 | |
129 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, | |
130 char *addr, size_t bytes, bool read_only = false, | |
131 bool allow_exec = false); | |
132 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, | |
133 char *addr, size_t bytes, bool read_only, | |
134 bool allow_exec); | |
135 static bool pd_unmap_memory(char *addr, size_t bytes); | |
136 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); | |
137 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); | |
138 | |
139 | |
0 | 140 public: |
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141 static void init(void); // Called before command line parsing |
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142 static jint init_2(void); // Called after command line parsing |
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143 static void init_globals(void) { // Called from init_globals() in init.cpp |
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144 init_globals_ext(); |
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145 } |
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146 static void init_3(void); // Called at the end of vm init |
0 | 147 |
148 // File names are case-insensitive on windows only | |
149 // Override me as needed | |
150 static int file_name_strcmp(const char* s1, const char* s2); | |
151 | |
152 static bool getenv(const char* name, char* buffer, int len); | |
153 static bool have_special_privileges(); | |
154 | |
155 static jlong javaTimeMillis(); | |
156 static jlong javaTimeNanos(); | |
157 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); | |
158 static void run_periodic_checks(); | |
159 | |
160 | |
161 // Returns the elapsed time in seconds since the vm started. | |
162 static double elapsedTime(); | |
163 | |
164 // Returns real time in seconds since an arbitrary point | |
165 // in the past. | |
166 static bool getTimesSecs(double* process_real_time, | |
167 double* process_user_time, | |
168 double* process_system_time); | |
169 | |
170 // Interface to the performance counter | |
171 static jlong elapsed_counter(); | |
172 static jlong elapsed_frequency(); | |
173 | |
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174 // The "virtual time" of a thread is the amount of time a thread has |
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175 // actually run. The first function indicates whether the OS supports |
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176 // this functionality for the current thread, and if so: |
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177 // * the second enables vtime tracking (if that is required). |
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178 // * the third tells whether vtime is enabled. |
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179 // * the fourth returns the elapsed virtual time for the current |
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180 // thread. |
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181 static bool supports_vtime(); |
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182 static bool enable_vtime(); |
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183 static bool vtime_enabled(); |
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184 static double elapsedVTime(); |
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185 |
0 | 186 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). |
187 // It is MT safe, but not async-safe, as reading time zone | |
188 // information may require a lock on some platforms. | |
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189 static char* local_time_string(char *buf, size_t buflen); |
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190 static struct tm* localtime_pd (const time_t* clock, struct tm* res); |
0 | 191 // Fill in buffer with current local time as an ISO-8601 string. |
192 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. | |
193 // Returns buffer, or NULL if it failed. | |
194 static char* iso8601_time(char* buffer, size_t buffer_length); | |
195 | |
196 // Interface for detecting multiprocessor system | |
197 static inline bool is_MP() { | |
198 assert(_processor_count > 0, "invalid processor count"); | |
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199 return _processor_count > 1 || AssumeMP; |
0 | 200 } |
201 static julong available_memory(); | |
202 static julong physical_memory(); | |
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203 static bool has_allocatable_memory_limit(julong* limit); |
0 | 204 static bool is_server_class_machine(); |
205 | |
206 // number of CPUs | |
207 static int processor_count() { | |
208 return _processor_count; | |
209 } | |
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210 static void set_processor_count(int count) { _processor_count = count; } |
0 | 211 |
212 // Returns the number of CPUs this process is currently allowed to run on. | |
213 // Note that on some OSes this can change dynamically. | |
214 static int active_processor_count(); | |
215 | |
216 // Bind processes to processors. | |
217 // This is a two step procedure: | |
218 // first you generate a distribution of processes to processors, | |
219 // then you bind processes according to that distribution. | |
220 // Compute a distribution for number of processes to processors. | |
221 // Stores the processor id's into the distribution array argument. | |
222 // Returns true if it worked, false if it didn't. | |
223 static bool distribute_processes(uint length, uint* distribution); | |
224 // Binds the current process to a processor. | |
225 // Returns true if it worked, false if it didn't. | |
226 static bool bind_to_processor(uint processor_id); | |
227 | |
4006 | 228 // Give a name to the current thread. |
229 static void set_native_thread_name(const char *name); | |
230 | |
0 | 231 // Interface for stack banging (predetect possible stack overflow for |
232 // exception processing) There are guard pages, and above that shadow | |
233 // pages for stack overflow checking. | |
234 static bool uses_stack_guard_pages(); | |
235 static bool allocate_stack_guard_pages(); | |
236 static void bang_stack_shadow_pages(); | |
237 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); | |
238 | |
239 // OS interface to Virtual Memory | |
240 | |
241 // Return the default page size. | |
242 static int vm_page_size(); | |
243 | |
244 // Return the page size to use for a region of memory. The min_pages argument | |
245 // is a hint intended to limit fragmentation; it says the returned page size | |
246 // should be <= region_max_size / min_pages. Because min_pages is a hint, | |
247 // this routine may return a size larger than region_max_size / min_pages. | |
248 // | |
249 // The current implementation ignores min_pages if a larger page size is an | |
250 // exact multiple of both region_min_size and region_max_size. This allows | |
251 // larger pages to be used when doing so would not cause fragmentation; in | |
252 // particular, a single page can be used when region_min_size == | |
253 // region_max_size == a supported page size. | |
254 static size_t page_size_for_region(size_t region_min_size, | |
255 size_t region_max_size, | |
256 uint min_pages); | |
257 | |
3859 | 258 // Methods for tracing page sizes returned by the above method; enabled by |
0 | 259 // TracePageSizes. The region_{min,max}_size parameters should be the values |
260 // passed to page_size_for_region() and page_size should be the result of that | |
261 // call. The (optional) base and size parameters should come from the | |
262 // ReservedSpace base() and size() methods. | |
3859 | 263 static void trace_page_sizes(const char* str, const size_t* page_sizes, |
264 int count) PRODUCT_RETURN; | |
0 | 265 static void trace_page_sizes(const char* str, const size_t region_min_size, |
266 const size_t region_max_size, | |
267 const size_t page_size, | |
268 const char* base = NULL, | |
269 const size_t size = 0) PRODUCT_RETURN; | |
270 | |
271 static int vm_allocation_granularity(); | |
272 static char* reserve_memory(size_t bytes, char* addr = 0, | |
273 size_t alignment_hint = 0); | |
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274 static char* reserve_memory(size_t bytes, char* addr, |
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275 size_t alignment_hint, MEMFLAGS flags); |
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276 static char* reserve_memory_aligned(size_t size, size_t alignment); |
0 | 277 static char* attempt_reserve_memory_at(size_t bytes, char* addr); |
278 static void split_reserved_memory(char *base, size_t size, | |
279 size_t split, bool realloc); | |
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280 static bool commit_memory(char* addr, size_t bytes, bool executable); |
656 | 281 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, |
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282 bool executable); |
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283 // Same as commit_memory() that either succeeds or calls |
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284 // vm_exit_out_of_memory() with the specified mesg. |
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285 static void commit_memory_or_exit(char* addr, size_t bytes, |
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286 bool executable, const char* mesg); |
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287 static void commit_memory_or_exit(char* addr, size_t size, |
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288 size_t alignment_hint, |
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289 bool executable, const char* mesg); |
0 | 290 static bool uncommit_memory(char* addr, size_t bytes); |
291 static bool release_memory(char* addr, size_t bytes); | |
237
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292 |
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293 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; |
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294 static bool protect_memory(char* addr, size_t bytes, ProtType prot, |
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295 bool is_committed = true); |
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296 |
0 | 297 static bool guard_memory(char* addr, size_t bytes); |
298 static bool unguard_memory(char* addr, size_t bytes); | |
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299 static bool create_stack_guard_pages(char* addr, size_t bytes); |
6197 | 300 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); |
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301 static bool remove_stack_guard_pages(char* addr, size_t bytes); |
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302 |
0 | 303 static char* map_memory(int fd, const char* file_name, size_t file_offset, |
304 char *addr, size_t bytes, bool read_only = false, | |
305 bool allow_exec = false); | |
306 static char* remap_memory(int fd, const char* file_name, size_t file_offset, | |
307 char *addr, size_t bytes, bool read_only, | |
308 bool allow_exec); | |
309 static bool unmap_memory(char *addr, size_t bytes); | |
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310 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); |
0 | 311 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); |
312 | |
313 // NUMA-specific interface | |
141 | 314 static bool numa_has_static_binding(); |
315 static bool numa_has_group_homing(); | |
316 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); | |
0 | 317 static void numa_make_global(char *addr, size_t bytes); |
318 static size_t numa_get_groups_num(); | |
319 static size_t numa_get_leaf_groups(int *ids, size_t size); | |
320 static bool numa_topology_changed(); | |
321 static int numa_get_group_id(); | |
322 | |
323 // Page manipulation | |
324 struct page_info { | |
325 size_t size; | |
326 int lgrp_id; | |
327 }; | |
328 static bool get_page_info(char *start, page_info* info); | |
329 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); | |
330 | |
331 static char* non_memory_address_word(); | |
332 // reserve, commit and pin the entire memory region | |
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333 static char* reserve_memory_special(size_t size, size_t alignment, |
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334 char* addr, bool executable); |
0 | 335 static bool release_memory_special(char* addr, size_t bytes); |
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336 static void large_page_init(); |
0 | 337 static size_t large_page_size(); |
338 static bool can_commit_large_page_memory(); | |
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339 static bool can_execute_large_page_memory(); |
0 | 340 |
341 // OS interface to polling page | |
342 static address get_polling_page() { return _polling_page; } | |
343 static void set_polling_page(address page) { _polling_page = page; } | |
344 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } | |
345 static void make_polling_page_unreadable(); | |
346 static void make_polling_page_readable(); | |
347 | |
348 // Routines used to serialize the thread state without using membars | |
349 static void serialize_thread_states(); | |
350 | |
351 // Since we write to the serialize page from every thread, we | |
352 // want stores to be on unique cache lines whenever possible | |
353 // in order to minimize CPU cross talk. We pre-compute the | |
354 // amount to shift the thread* to make this offset unique to | |
355 // each thread. | |
356 static int get_serialize_page_shift_count() { | |
357 return SerializePageShiftCount; | |
358 } | |
359 | |
360 static void set_serialize_page_mask(uintptr_t mask) { | |
361 _serialize_page_mask = mask; | |
362 } | |
363 | |
364 static unsigned int get_serialize_page_mask() { | |
365 return _serialize_page_mask; | |
366 } | |
367 | |
368 static void set_memory_serialize_page(address page); | |
369 | |
370 static address get_memory_serialize_page() { | |
371 return (address)_mem_serialize_page; | |
372 } | |
373 | |
374 static inline void write_memory_serialize_page(JavaThread *thread) { | |
375 uintptr_t page_offset = ((uintptr_t)thread >> | |
376 get_serialize_page_shift_count()) & | |
377 get_serialize_page_mask(); | |
378 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; | |
379 } | |
380 | |
381 static bool is_memory_serialize_page(JavaThread *thread, address addr) { | |
382 if (UseMembar) return false; | |
1078 | 383 // Previously this function calculated the exact address of this |
384 // thread's serialize page, and checked if the faulting address | |
385 // was equal. However, some platforms mask off faulting addresses | |
386 // to the page size, so now we just check that the address is | |
387 // within the page. This makes the thread argument unnecessary, | |
388 // but we retain the NULL check to preserve existing behaviour. | |
0 | 389 if (thread == NULL) return false; |
1078 | 390 address page = (address) _mem_serialize_page; |
391 return addr >= page && addr < (page + os::vm_page_size()); | |
0 | 392 } |
393 | |
394 static void block_on_serialize_page_trap(); | |
395 | |
396 // threads | |
397 | |
398 enum ThreadType { | |
399 vm_thread, | |
400 cgc_thread, // Concurrent GC thread | |
401 pgc_thread, // Parallel GC thread | |
402 java_thread, | |
403 compiler_thread, | |
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404 watcher_thread, |
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405 os_thread |
0 | 406 }; |
407 | |
408 static bool create_thread(Thread* thread, | |
409 ThreadType thr_type, | |
410 size_t stack_size = 0); | |
411 static bool create_main_thread(JavaThread* thread); | |
412 static bool create_attached_thread(JavaThread* thread); | |
413 static void pd_start_thread(Thread* thread); | |
414 static void start_thread(Thread* thread); | |
415 | |
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416 static void initialize_thread(Thread* thr); |
0 | 417 static void free_thread(OSThread* osthread); |
418 | |
419 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit | |
420 static intx current_thread_id(); | |
421 static int current_process_id(); | |
422 static int sleep(Thread* thread, jlong ms, bool interruptable); | |
423 static int naked_sleep(); | |
424 static void infinite_sleep(); // never returns, use with CAUTION | |
425 static void yield(); // Yields to all threads with same priority | |
426 enum YieldResult { | |
427 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran | |
428 YIELD_NONEREADY = 0, // No other runnable/ready threads. | |
429 // platform-specific yield return immediately | |
430 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY | |
431 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" | |
432 // yield that can be used in lieu of blocking. | |
433 } ; | |
434 static YieldResult NakedYield () ; | |
435 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority | |
436 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing | |
437 static OSReturn set_priority(Thread* thread, ThreadPriority priority); | |
438 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); | |
439 | |
440 static void interrupt(Thread* thread); | |
441 static bool is_interrupted(Thread* thread, bool clear_interrupted); | |
442 | |
443 static int pd_self_suspend_thread(Thread* thread); | |
444 | |
445 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); | |
446 static frame fetch_frame_from_context(void* ucVoid); | |
447 | |
448 static ExtendedPC get_thread_pc(Thread *thread); | |
449 static void breakpoint(); | |
450 | |
451 static address current_stack_pointer(); | |
452 static address current_stack_base(); | |
453 static size_t current_stack_size(); | |
454 | |
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455 static void verify_stack_alignment() PRODUCT_RETURN; |
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456 |
0 | 457 static int message_box(const char* title, const char* message); |
458 static char* do_you_want_to_debug(const char* message); | |
459 | |
460 // run cmd in a separate process and return its exit code; or -1 on failures | |
461 static int fork_and_exec(char *cmd); | |
462 | |
463 // Set file to send error reports. | |
464 static void set_error_file(const char *logfile); | |
465 | |
466 // os::exit() is merged with vm_exit() | |
467 // static void exit(int num); | |
468 | |
469 // Terminate the VM, but don't exit the process | |
470 static void shutdown(); | |
471 | |
472 // Terminate with an error. Default is to generate a core file on platforms | |
473 // that support such things. This calls shutdown() and then aborts. | |
474 static void abort(bool dump_core = true); | |
475 | |
476 // Die immediately, no exit hook, no abort hook, no cleanup. | |
477 static void die(); | |
478 | |
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479 // File i/o operations |
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480 static const int default_file_open_flags(); |
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481 static int open(const char *path, int oflag, int mode); |
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482 static FILE* open(int fd, const char* mode); |
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483 static int close(int fd); |
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484 static jlong lseek(int fd, jlong offset, int whence); |
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485 static char* native_path(char *path); |
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486 static int ftruncate(int fd, jlong length); |
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487 static int fsync(int fd); |
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488 static int available(int fd, jlong *bytes); |
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489 |
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490 //File i/o operations |
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491 |
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492 static size_t read(int fd, void *buf, unsigned int nBytes); |
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493 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); |
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494 static size_t write(int fd, const void *buf, unsigned int nBytes); |
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495 |
0 | 496 // Reading directories. |
497 static DIR* opendir(const char* dirname); | |
498 static int readdir_buf_size(const char *path); | |
499 static struct dirent* readdir(DIR* dirp, dirent* dbuf); | |
500 static int closedir(DIR* dirp); | |
501 | |
502 // Dynamic library extension | |
503 static const char* dll_file_extension(); | |
504 | |
505 static const char* get_temp_directory(); | |
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506 static const char* get_current_directory(char *buf, size_t buflen); |
0 | 507 |
242 | 508 // Builds a platform-specific full library path given a ld path and lib name |
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509 // Returns true if buffer contains full path to existing file, false otherwise |
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510 static bool dll_build_name(char* buffer, size_t size, |
242 | 511 const char* pathname, const char* fname); |
512 | |
0 | 513 // Symbol lookup, find nearest function name; basically it implements |
514 // dladdr() for all platforms. Name of the nearest function is copied | |
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515 // to buf. Distance from its base address is optionally returned as offset. |
0 | 516 // If function name is not found, buf[0] is set to '\0' and offset is |
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517 // set to -1 (if offset is non-NULL). |
0 | 518 static bool dll_address_to_function_name(address addr, char* buf, |
519 int buflen, int* offset); | |
520 | |
521 // Locate DLL/DSO. On success, full path of the library is copied to | |
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522 // buf, and offset is optionally set to be the distance between addr |
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523 // and the library's base address. On failure, buf[0] is set to '\0' |
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524 // and offset is set to -1 (if offset is non-NULL). |
0 | 525 static bool dll_address_to_library_name(address addr, char* buf, |
526 int buflen, int* offset); | |
527 | |
528 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. | |
529 static bool address_is_in_vm(address addr); | |
530 | |
531 // Loads .dll/.so and | |
532 // in case of error it checks if .dll/.so was built for the | |
533 // same architecture as Hotspot is running on | |
534 static void* dll_load(const char *name, char *ebuf, int ebuflen); | |
535 | |
242 | 536 // lookup symbol in a shared library |
537 static void* dll_lookup(void* handle, const char* name); | |
538 | |
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539 // Unload library |
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540 static void dll_unload(void *lib); |
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541 |
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542 // Return the handle of this process |
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543 static void* get_default_process_handle(); |
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544 |
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545 // Check for static linked agent library |
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546 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], |
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547 size_t syms_len); |
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548 |
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549 // Find agent entry point |
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550 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib, |
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551 const char *syms[], size_t syms_len); |
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552 |
0 | 553 // Print out system information; they are called by fatal error handler. |
554 // Output format may be different on different platforms. | |
555 static void print_os_info(outputStream* st); | |
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556 static void print_os_info_brief(outputStream* st); |
0 | 557 static void print_cpu_info(outputStream* st); |
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558 static void pd_print_cpu_info(outputStream* st); |
0 | 559 static void print_memory_info(outputStream* st); |
560 static void print_dll_info(outputStream* st); | |
561 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); | |
562 static void print_context(outputStream* st, void* context); | |
1907 | 563 static void print_register_info(outputStream* st, void* context); |
0 | 564 static void print_siginfo(outputStream* st, void* siginfo); |
565 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); | |
566 static void print_date_and_time(outputStream* st); | |
567 | |
1907 | 568 static void print_location(outputStream* st, intptr_t x, bool verbose = false); |
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569 static size_t lasterror(char *buf, size_t len); |
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570 static int get_last_error(); |
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571 |
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572 // Determines whether the calling process is being debugged by a user-mode debugger. |
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573 static bool is_debugger_attached(); |
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574 |
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575 // wait for a key press if PauseAtExit is set |
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576 static void wait_for_keypress_at_exit(void); |
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577 |
0 | 578 // The following two functions are used by fatal error handler to trace |
579 // native (C) frames. They are not part of frame.hpp/frame.cpp because | |
580 // frame.hpp/cpp assume thread is JavaThread, and also because different | |
581 // OS/compiler may have different convention or provide different API to | |
582 // walk C frames. | |
583 // | |
584 // We don't attempt to become a debugger, so we only follow frames if that | |
585 // does not require a lookup in the unwind table, which is part of the binary | |
586 // file but may be unsafe to read after a fatal error. So on x86, we can | |
587 // only walk stack if %ebp is used as frame pointer; on ia64, it's not | |
588 // possible to walk C stack without having the unwind table. | |
589 static bool is_first_C_frame(frame *fr); | |
590 static frame get_sender_for_C_frame(frame *fr); | |
591 | |
592 // return current frame. pc() and sp() are set to NULL on failure. | |
593 static frame current_frame(); | |
594 | |
595 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); | |
596 | |
597 // returns a string to describe the exception/signal; | |
598 // returns NULL if exception_code is not an OS exception/signal. | |
599 static const char* exception_name(int exception_code, char* buf, size_t buflen); | |
600 | |
601 // Returns native Java library, loads if necessary | |
602 static void* native_java_library(); | |
603 | |
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604 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) |
0 | 605 static void jvm_path(char *buf, jint buflen); |
606 | |
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607 // Returns true if we are running in a headless jre. |
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608 static bool is_headless_jre(); |
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609 |
0 | 610 // JNI names |
611 static void print_jni_name_prefix_on(outputStream* st, int args_size); | |
612 static void print_jni_name_suffix_on(outputStream* st, int args_size); | |
613 | |
614 // File conventions | |
615 static const char* file_separator(); | |
616 static const char* line_separator(); | |
617 static const char* path_separator(); | |
618 | |
619 // Init os specific system properties values | |
620 static void init_system_properties_values(); | |
621 | |
622 // IO operations, non-JVM_ version. | |
623 static int stat(const char* path, struct stat* sbuf); | |
624 static bool dir_is_empty(const char* path); | |
625 | |
626 // IO operations on binary files | |
627 static int create_binary_file(const char* path, bool rewrite_existing); | |
628 static jlong current_file_offset(int fd); | |
629 static jlong seek_to_file_offset(int fd, jlong offset); | |
630 | |
631 // Thread Local Storage | |
632 static int allocate_thread_local_storage(); | |
633 static void thread_local_storage_at_put(int index, void* value); | |
634 static void* thread_local_storage_at(int index); | |
635 static void free_thread_local_storage(int index); | |
636 | |
6197 | 637 // Stack walk |
638 static address get_caller_pc(int n = 0); | |
639 | |
0 | 640 // General allocation (must be MT-safe) |
6197 | 641 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0); |
642 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0); | |
643 static void free (void *memblock, MEMFLAGS flags = mtNone); | |
0 | 644 static bool check_heap(bool force = false); // verify C heap integrity |
6197 | 645 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup |
0 | 646 |
647 #ifndef PRODUCT | |
2250 | 648 static julong num_mallocs; // # of calls to malloc/realloc |
649 static julong alloc_bytes; // # of bytes allocated | |
650 static julong num_frees; // # of calls to free | |
651 static julong free_bytes; // # of bytes freed | |
0 | 652 #endif |
653 | |
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654 // SocketInterface (ex HPI SocketInterface ) |
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655 static int socket(int domain, int type, int protocol); |
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656 static int socket_close(int fd); |
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657 static int socket_shutdown(int fd, int howto); |
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658 static int recv(int fd, char* buf, size_t nBytes, uint flags); |
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659 static int send(int fd, char* buf, size_t nBytes, uint flags); |
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660 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); |
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661 static int timeout(int fd, long timeout); |
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662 static int listen(int fd, int count); |
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663 static int connect(int fd, struct sockaddr* him, socklen_t len); |
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664 static int bind(int fd, struct sockaddr* him, socklen_t len); |
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665 static int accept(int fd, struct sockaddr* him, socklen_t* len); |
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666 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, |
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667 struct sockaddr* from, socklen_t* fromlen); |
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668 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); |
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669 static int sendto(int fd, char* buf, size_t len, uint flags, |
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670 struct sockaddr* to, socklen_t tolen); |
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671 static int socket_available(int fd, jint* pbytes); |
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672 |
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673 static int get_sock_opt(int fd, int level, int optname, |
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674 char* optval, socklen_t* optlen); |
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675 static int set_sock_opt(int fd, int level, int optname, |
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676 const char* optval, socklen_t optlen); |
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677 static int get_host_name(char* name, int namelen); |
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678 |
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679 static struct hostent* get_host_by_name(char* name); |
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680 |
0 | 681 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) |
682 static void signal_init(); | |
683 static void signal_init_pd(); | |
684 static void signal_notify(int signal_number); | |
685 static void* signal(int signal_number, void* handler); | |
686 static void signal_raise(int signal_number); | |
687 static int signal_wait(); | |
688 static int signal_lookup(); | |
689 static void* user_handler(); | |
690 static void terminate_signal_thread(); | |
691 static int sigexitnum_pd(); | |
692 | |
693 // random number generation | |
694 static long random(); // return 32bit pseudorandom number | |
695 static void init_random(long initval); // initialize random sequence | |
696 | |
697 // Structured OS Exception support | |
698 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
699 | |
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700 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits |
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701 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); |
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702 |
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703 // Get the default path to the core file |
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704 // Returns the length of the string |
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705 static int get_core_path(char* buffer, size_t bufferSize); |
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706 |
0 | 707 // JVMTI & JVM monitoring and management support |
708 // The thread_cpu_time() and current_thread_cpu_time() are only | |
709 // supported if is_thread_cpu_time_supported() returns true. | |
710 // They are not supported on Solaris T1. | |
711 | |
712 // Thread CPU Time - return the fast estimate on a platform | |
713 // On Solaris - call gethrvtime (fast) - user time only | |
714 // On Linux - fast clock_gettime where available - user+sys | |
715 // - otherwise: very slow /proc fs - user+sys | |
716 // On Windows - GetThreadTimes - user+sys | |
717 static jlong current_thread_cpu_time(); | |
718 static jlong thread_cpu_time(Thread* t); | |
719 | |
720 // Thread CPU Time with user_sys_cpu_time parameter. | |
721 // | |
722 // If user_sys_cpu_time is true, user+sys time is returned. | |
723 // Otherwise, only user time is returned | |
724 static jlong current_thread_cpu_time(bool user_sys_cpu_time); | |
725 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); | |
726 | |
727 // Return a bunch of info about the timers. | |
728 // Note that the returned info for these two functions may be different | |
729 // on some platforms | |
730 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
731 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
732 | |
733 static bool is_thread_cpu_time_supported(); | |
734 | |
735 // System loadavg support. Returns -1 if load average cannot be obtained. | |
736 static int loadavg(double loadavg[], int nelem); | |
737 | |
738 // Hook for os specific jvm options that we don't want to abort on seeing | |
739 static bool obsolete_option(const JavaVMOption *option); | |
740 | |
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741 // Extensions |
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742 #include "runtime/os_ext.hpp" |
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743 |
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744 public: |
11151 | 745 class CrashProtectionCallback : public StackObj { |
746 public: | |
747 virtual void call() = 0; | |
748 }; | |
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749 |
0 | 750 // Platform dependent stuff |
1972 | 751 #ifdef TARGET_OS_FAMILY_linux |
752 # include "os_linux.hpp" | |
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753 # include "os_posix.hpp" |
1972 | 754 #endif |
755 #ifdef TARGET_OS_FAMILY_solaris | |
756 # include "os_solaris.hpp" | |
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757 # include "os_posix.hpp" |
1972 | 758 #endif |
759 #ifdef TARGET_OS_FAMILY_windows | |
760 # include "os_windows.hpp" | |
761 #endif | |
3960 | 762 #ifdef TARGET_OS_FAMILY_bsd |
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763 # include "os_posix.hpp" |
3960 | 764 # include "os_bsd.hpp" |
765 #endif | |
1972 | 766 #ifdef TARGET_OS_ARCH_linux_x86 |
767 # include "os_linux_x86.hpp" | |
768 #endif | |
769 #ifdef TARGET_OS_ARCH_linux_sparc | |
770 # include "os_linux_sparc.hpp" | |
771 #endif | |
772 #ifdef TARGET_OS_ARCH_linux_zero | |
773 # include "os_linux_zero.hpp" | |
774 #endif | |
775 #ifdef TARGET_OS_ARCH_solaris_x86 | |
776 # include "os_solaris_x86.hpp" | |
777 #endif | |
778 #ifdef TARGET_OS_ARCH_solaris_sparc | |
779 # include "os_solaris_sparc.hpp" | |
780 #endif | |
781 #ifdef TARGET_OS_ARCH_windows_x86 | |
782 # include "os_windows_x86.hpp" | |
783 #endif | |
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784 #ifdef TARGET_OS_ARCH_linux_arm |
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785 # include "os_linux_arm.hpp" |
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786 #endif |
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787 #ifdef TARGET_OS_ARCH_linux_ppc |
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788 # include "os_linux_ppc.hpp" |
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789 #endif |
3960 | 790 #ifdef TARGET_OS_ARCH_bsd_x86 |
791 # include "os_bsd_x86.hpp" | |
792 #endif | |
793 #ifdef TARGET_OS_ARCH_bsd_zero | |
794 # include "os_bsd_zero.hpp" | |
795 #endif | |
1972 | 796 |
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797 public: |
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798 // debugging support (mostly used by debug.cpp but also fatal error handler) |
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799 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address |
0 | 800 |
801 static bool dont_yield(); // when true, JVM_Yield() is nop | |
802 static void print_statistics(); | |
803 | |
804 // Thread priority helpers (implemented in OS-specific part) | |
805 static OSReturn set_native_priority(Thread* thread, int native_prio); | |
806 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); | |
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807 static int java_to_os_priority[CriticalPriority + 1]; |
0 | 808 // Hint to the underlying OS that a task switch would not be good. |
809 // Void return because it's a hint and can fail. | |
810 static void hint_no_preempt(); | |
811 | |
812 // Used at creation if requested by the diagnostic flag PauseAtStartup. | |
813 // Causes the VM to wait until an external stimulus has been applied | |
814 // (for Unix, that stimulus is a signal, for Windows, an external | |
815 // ResumeThread call) | |
816 static void pause(); | |
817 | |
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818 // Builds a platform dependent Agent_OnLoad_<libname> function name |
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819 // which is used to find statically linked in agents. |
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820 static char* build_agent_function_name(const char *sym, const char *cname, |
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821 bool is_absolute_path); |
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822 |
10405 | 823 class SuspendedThreadTaskContext { |
824 public: | |
825 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} | |
826 Thread* thread() const { return _thread; } | |
827 void* ucontext() const { return _ucontext; } | |
828 private: | |
829 Thread* _thread; | |
830 void* _ucontext; | |
831 }; | |
832 | |
833 class SuspendedThreadTask { | |
834 public: | |
835 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} | |
836 virtual ~SuspendedThreadTask() {} | |
837 void run(); | |
838 bool is_done() { return _done; } | |
839 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; | |
840 protected: | |
841 private: | |
842 void internal_do_task(); | |
843 Thread* _thread; | |
844 bool _done; | |
845 }; | |
846 | |
847 #ifndef TARGET_OS_FAMILY_windows | |
848 // Suspend/resume support | |
849 // Protocol: | |
850 // | |
851 // a thread starts in SR_RUNNING | |
852 // | |
853 // SR_RUNNING can go to | |
854 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it | |
855 // SR_SUSPEND_REQUEST can go to | |
856 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) | |
857 // * SR_SUSPENDED if the stopped thread receives the signal and switches state | |
858 // SR_SUSPENDED can go to | |
859 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume | |
860 // SR_WAKEUP_REQUEST can go to | |
861 // * SR_RUNNING when the stopped thread receives the signal | |
862 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) | |
863 class SuspendResume { | |
864 public: | |
865 enum State { | |
866 SR_RUNNING, | |
867 SR_SUSPEND_REQUEST, | |
868 SR_SUSPENDED, | |
869 SR_WAKEUP_REQUEST | |
870 }; | |
871 | |
872 private: | |
873 volatile State _state; | |
874 | |
875 private: | |
876 /* try to switch state from state "from" to state "to" | |
877 * returns the state set after the method is complete | |
878 */ | |
879 State switch_state(State from, State to); | |
880 | |
881 public: | |
882 SuspendResume() : _state(SR_RUNNING) { } | |
883 | |
884 State state() const { return _state; } | |
885 | |
886 State request_suspend() { | |
887 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); | |
888 } | |
889 | |
890 State cancel_suspend() { | |
891 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); | |
892 } | |
893 | |
894 State suspended() { | |
895 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); | |
896 } | |
897 | |
898 State request_wakeup() { | |
899 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); | |
900 } | |
901 | |
902 State running() { | |
903 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); | |
904 } | |
905 | |
906 bool is_running() const { | |
907 return _state == SR_RUNNING; | |
908 } | |
909 | |
910 bool is_suspend_request() const { | |
911 return _state == SR_SUSPEND_REQUEST; | |
912 } | |
913 | |
914 bool is_suspended() const { | |
915 return _state == SR_SUSPENDED; | |
916 } | |
917 }; | |
918 #endif | |
919 | |
920 | |
0 | 921 protected: |
922 static long _rand_seed; // seed for random number generator | |
923 static int _processor_count; // number of processors | |
924 | |
925 static char* format_boot_path(const char* format_string, | |
926 const char* home, | |
927 int home_len, | |
928 char fileSep, | |
929 char pathSep); | |
930 static bool set_boot_path(char fileSep, char pathSep); | |
691 | 931 static char** split_path(const char* path, int* n); |
11151 | 932 |
0 | 933 }; |
934 | |
935 // Note that "PAUSE" is almost always used with synchronization | |
936 // so arguably we should provide Atomic::SpinPause() instead | |
937 // of the global SpinPause() with C linkage. | |
938 // It'd also be eligible for inlining on many platforms. | |
939 | |
11127 | 940 extern "C" int SpinPause(); |
1972 | 941 |
942 #endif // SHARE_VM_RUNTIME_OS_HPP |