Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/os.hpp @ 22973:340ca8812af9
8067469: G1 ignores AlwaysPreTouch
Summary: Factor out pretouch code of the various virtual space management classes and use them everywhere including in G1.
Reviewed-by: stefank, ehelin, dholmes
author | tschatzl |
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date | Thu, 18 Dec 2014 09:37:02 +0100 |
parents | 8461d0b03127 |
children | c2ce24504334 |
rev | line source |
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0 | 1 /* |
17567 | 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_OS_HPP |
26 #define SHARE_VM_RUNTIME_OS_HPP | |
27 | |
28 #include "jvmtifiles/jvmti.h" | |
29 #include "runtime/atomic.hpp" | |
30 #include "runtime/extendedPC.hpp" | |
31 #include "runtime/handles.hpp" | |
32 #include "utilities/top.hpp" | |
33 #ifdef TARGET_OS_FAMILY_linux | |
34 # include "jvm_linux.h" | |
11151 | 35 # include <setjmp.h> |
1972 | 36 #endif |
37 #ifdef TARGET_OS_FAMILY_solaris | |
38 # include "jvm_solaris.h" | |
11151 | 39 # include <setjmp.h> |
1972 | 40 #endif |
41 #ifdef TARGET_OS_FAMILY_windows | |
42 # include "jvm_windows.h" | |
43 #endif | |
14411 | 44 #ifdef TARGET_OS_FAMILY_aix |
45 # include "jvm_aix.h" | |
46 # include <setjmp.h> | |
47 #endif | |
3960 | 48 #ifdef TARGET_OS_FAMILY_bsd |
49 # include "jvm_bsd.h" | |
11151 | 50 # include <setjmp.h> |
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51 # ifdef __APPLE__ |
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52 # include <mach/mach_time.h> |
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53 # endif |
3960 | 54 #endif |
1972 | 55 |
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56 class AgentLibrary; |
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57 |
0 | 58 // os defines the interface to operating system; this includes traditional |
59 // OS services (time, I/O) as well as other functionality with system- | |
60 // dependent code. | |
61 | |
62 typedef void (*dll_func)(...); | |
63 | |
64 class Thread; | |
65 class JavaThread; | |
66 class Event; | |
67 class DLL; | |
68 class FileHandle; | |
20360 | 69 class NativeCallStack; |
70 | |
141 | 71 template<class E> class GrowableArray; |
0 | 72 |
73 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose | |
74 | |
75 // Platform-independent error return values from OS functions | |
76 enum OSReturn { | |
77 OS_OK = 0, // Operation was successful | |
78 OS_ERR = -1, // Operation failed | |
79 OS_INTRPT = -2, // Operation was interrupted | |
80 OS_TIMEOUT = -3, // Operation timed out | |
81 OS_NOMEM = -5, // Operation failed for lack of memory | |
82 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource | |
83 }; | |
84 | |
85 enum ThreadPriority { // JLS 20.20.1-3 | |
86 NoPriority = -1, // Initial non-priority value | |
87 MinPriority = 1, // Minimum priority | |
88 NormPriority = 5, // Normal (non-daemon) priority | |
89 NearMaxPriority = 9, // High priority, used for VMThread | |
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90 MaxPriority = 10, // Highest priority, used for WatcherThread |
0 | 91 // ensures that VMThread doesn't starve profiler |
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92 CriticalPriority = 11 // Critical thread priority |
0 | 93 }; |
94 | |
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95 // Executable parameter flag for os::commit_memory() and |
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96 // os::commit_memory_or_exit(). |
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97 const bool ExecMem = true; |
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98 |
0 | 99 // Typedef for structured exception handling support |
100 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
101 | |
20360 | 102 class MallocTracker; |
103 | |
0 | 104 class os: AllStatic { |
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105 friend class VMStructs; |
20360 | 106 friend class MallocTracker; |
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107 public: |
0 | 108 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) |
109 | |
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110 private: |
0 | 111 static OSThread* _starting_thread; |
112 static address _polling_page; | |
113 static volatile int32_t * _mem_serialize_page; | |
114 static uintptr_t _serialize_page_mask; | |
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115 public: |
0 | 116 static size_t _page_sizes[page_sizes_max]; |
117 | |
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118 private: |
0 | 119 static void init_page_sizes(size_t default_page_size) { |
120 _page_sizes[0] = default_page_size; | |
121 _page_sizes[1] = 0; // sentinel | |
122 } | |
123 | |
6197 | 124 static char* pd_reserve_memory(size_t bytes, char* addr = 0, |
125 size_t alignment_hint = 0); | |
126 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); | |
127 static void pd_split_reserved_memory(char *base, size_t size, | |
128 size_t split, bool realloc); | |
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129 static bool pd_commit_memory(char* addr, size_t bytes, bool executable); |
6197 | 130 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
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131 bool executable); |
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132 // Same as pd_commit_memory() that either succeeds or calls |
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133 // vm_exit_out_of_memory() with the specified mesg. |
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134 static void pd_commit_memory_or_exit(char* addr, size_t bytes, |
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135 bool executable, const char* mesg); |
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136 static void pd_commit_memory_or_exit(char* addr, size_t size, |
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137 size_t alignment_hint, |
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138 bool executable, const char* mesg); |
6197 | 139 static bool pd_uncommit_memory(char* addr, size_t bytes); |
140 static bool pd_release_memory(char* addr, size_t bytes); | |
141 | |
142 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, | |
143 char *addr, size_t bytes, bool read_only = false, | |
144 bool allow_exec = false); | |
145 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, | |
146 char *addr, size_t bytes, bool read_only, | |
147 bool allow_exec); | |
148 static bool pd_unmap_memory(char *addr, size_t bytes); | |
149 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); | |
150 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); | |
151 | |
152 | |
0 | 153 public: |
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154 static void init(void); // Called before command line parsing |
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155 static void init_before_ergo(void); // Called after command line parsing |
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156 // before VM ergonomics processing. |
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157 static jint init_2(void); // Called after command line parsing |
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158 // and VM ergonomics processing |
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159 static void init_globals(void) { // Called from init_globals() in init.cpp |
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160 init_globals_ext(); |
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161 } |
0 | 162 |
163 // File names are case-insensitive on windows only | |
164 // Override me as needed | |
165 static int file_name_strcmp(const char* s1, const char* s2); | |
166 | |
20360 | 167 // get/unset environment variable |
0 | 168 static bool getenv(const char* name, char* buffer, int len); |
20360 | 169 static bool unsetenv(const char* name); |
170 | |
0 | 171 static bool have_special_privileges(); |
172 | |
173 static jlong javaTimeMillis(); | |
174 static jlong javaTimeNanos(); | |
175 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); | |
176 static void run_periodic_checks(); | |
177 | |
178 | |
179 // Returns the elapsed time in seconds since the vm started. | |
180 static double elapsedTime(); | |
181 | |
182 // Returns real time in seconds since an arbitrary point | |
183 // in the past. | |
184 static bool getTimesSecs(double* process_real_time, | |
185 double* process_user_time, | |
186 double* process_system_time); | |
187 | |
188 // Interface to the performance counter | |
189 static jlong elapsed_counter(); | |
190 static jlong elapsed_frequency(); | |
191 | |
342
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192 // The "virtual time" of a thread is the amount of time a thread has |
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193 // actually run. The first function indicates whether the OS supports |
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194 // this functionality for the current thread, and if so: |
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195 // * the second enables vtime tracking (if that is required). |
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196 // * the third tells whether vtime is enabled. |
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197 // * the fourth returns the elapsed virtual time for the current |
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198 // thread. |
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199 static bool supports_vtime(); |
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200 static bool enable_vtime(); |
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201 static bool vtime_enabled(); |
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202 static double elapsedVTime(); |
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203 |
0 | 204 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). |
205 // It is MT safe, but not async-safe, as reading time zone | |
206 // information may require a lock on some platforms. | |
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207 static char* local_time_string(char *buf, size_t buflen); |
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208 static struct tm* localtime_pd (const time_t* clock, struct tm* res); |
0 | 209 // Fill in buffer with current local time as an ISO-8601 string. |
210 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. | |
211 // Returns buffer, or NULL if it failed. | |
212 static char* iso8601_time(char* buffer, size_t buffer_length); | |
213 | |
214 // Interface for detecting multiprocessor system | |
215 static inline bool is_MP() { | |
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216 // During bootstrap if _processor_count is not yet initialized |
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217 // we claim to be MP as that is safest. If any platform has a |
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218 // stub generator that might be triggered in this phase and for |
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219 // which being declared MP when in fact not, is a problem - then |
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220 // the bootstrap routine for the stub generator needs to check |
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221 // the processor count directly and leave the bootstrap routine |
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222 // in place until called after initialization has ocurred. |
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223 return (_processor_count != 1) || AssumeMP; |
0 | 224 } |
225 static julong available_memory(); | |
226 static julong physical_memory(); | |
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227 static bool has_allocatable_memory_limit(julong* limit); |
0 | 228 static bool is_server_class_machine(); |
229 | |
230 // number of CPUs | |
231 static int processor_count() { | |
232 return _processor_count; | |
233 } | |
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234 static void set_processor_count(int count) { _processor_count = count; } |
0 | 235 |
236 // Returns the number of CPUs this process is currently allowed to run on. | |
237 // Note that on some OSes this can change dynamically. | |
238 static int active_processor_count(); | |
239 | |
240 // Bind processes to processors. | |
241 // This is a two step procedure: | |
242 // first you generate a distribution of processes to processors, | |
243 // then you bind processes according to that distribution. | |
244 // Compute a distribution for number of processes to processors. | |
245 // Stores the processor id's into the distribution array argument. | |
246 // Returns true if it worked, false if it didn't. | |
247 static bool distribute_processes(uint length, uint* distribution); | |
248 // Binds the current process to a processor. | |
249 // Returns true if it worked, false if it didn't. | |
250 static bool bind_to_processor(uint processor_id); | |
251 | |
4006 | 252 // Give a name to the current thread. |
253 static void set_native_thread_name(const char *name); | |
254 | |
0 | 255 // Interface for stack banging (predetect possible stack overflow for |
256 // exception processing) There are guard pages, and above that shadow | |
257 // pages for stack overflow checking. | |
258 static bool uses_stack_guard_pages(); | |
259 static bool allocate_stack_guard_pages(); | |
260 static void bang_stack_shadow_pages(); | |
261 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); | |
262 | |
263 // OS interface to Virtual Memory | |
264 | |
265 // Return the default page size. | |
266 static int vm_page_size(); | |
267 | |
268 // Return the page size to use for a region of memory. The min_pages argument | |
269 // is a hint intended to limit fragmentation; it says the returned page size | |
270 // should be <= region_max_size / min_pages. Because min_pages is a hint, | |
271 // this routine may return a size larger than region_max_size / min_pages. | |
272 // | |
273 // The current implementation ignores min_pages if a larger page size is an | |
274 // exact multiple of both region_min_size and region_max_size. This allows | |
275 // larger pages to be used when doing so would not cause fragmentation; in | |
276 // particular, a single page can be used when region_min_size == | |
277 // region_max_size == a supported page size. | |
278 static size_t page_size_for_region(size_t region_min_size, | |
279 size_t region_max_size, | |
280 uint min_pages); | |
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281 // Return the largest page size that can be used |
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282 static size_t max_page_size() { |
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283 // The _page_sizes array is sorted in descending order. |
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284 return _page_sizes[0]; |
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285 } |
0 | 286 |
3859 | 287 // Methods for tracing page sizes returned by the above method; enabled by |
0 | 288 // TracePageSizes. The region_{min,max}_size parameters should be the values |
289 // passed to page_size_for_region() and page_size should be the result of that | |
290 // call. The (optional) base and size parameters should come from the | |
291 // ReservedSpace base() and size() methods. | |
3859 | 292 static void trace_page_sizes(const char* str, const size_t* page_sizes, |
293 int count) PRODUCT_RETURN; | |
0 | 294 static void trace_page_sizes(const char* str, const size_t region_min_size, |
295 const size_t region_max_size, | |
296 const size_t page_size, | |
297 const char* base = NULL, | |
298 const size_t size = 0) PRODUCT_RETURN; | |
299 | |
300 static int vm_allocation_granularity(); | |
301 static char* reserve_memory(size_t bytes, char* addr = 0, | |
302 size_t alignment_hint = 0); | |
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303 static char* reserve_memory(size_t bytes, char* addr, |
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304 size_t alignment_hint, MEMFLAGS flags); |
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305 static char* reserve_memory_aligned(size_t size, size_t alignment); |
0 | 306 static char* attempt_reserve_memory_at(size_t bytes, char* addr); |
307 static void split_reserved_memory(char *base, size_t size, | |
308 size_t split, bool realloc); | |
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309 static bool commit_memory(char* addr, size_t bytes, bool executable); |
656 | 310 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, |
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311 bool executable); |
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312 // Same as commit_memory() that either succeeds or calls |
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313 // vm_exit_out_of_memory() with the specified mesg. |
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314 static void commit_memory_or_exit(char* addr, size_t bytes, |
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315 bool executable, const char* mesg); |
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316 static void commit_memory_or_exit(char* addr, size_t size, |
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317 size_t alignment_hint, |
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318 bool executable, const char* mesg); |
0 | 319 static bool uncommit_memory(char* addr, size_t bytes); |
320 static bool release_memory(char* addr, size_t bytes); | |
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321 |
22973 | 322 // Touch memory pages that cover the memory range from start to end (exclusive) |
323 // to make the OS back the memory range with actual memory. | |
324 // Current implementation may not touch the last page if unaligned addresses | |
325 // are passed. | |
326 static void pretouch_memory(char* start, char* end); | |
327 | |
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328 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; |
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329 static bool protect_memory(char* addr, size_t bytes, ProtType prot, |
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330 bool is_committed = true); |
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331 |
0 | 332 static bool guard_memory(char* addr, size_t bytes); |
333 static bool unguard_memory(char* addr, size_t bytes); | |
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334 static bool create_stack_guard_pages(char* addr, size_t bytes); |
6197 | 335 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); |
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336 static bool remove_stack_guard_pages(char* addr, size_t bytes); |
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337 |
0 | 338 static char* map_memory(int fd, const char* file_name, size_t file_offset, |
339 char *addr, size_t bytes, bool read_only = false, | |
340 bool allow_exec = false); | |
341 static char* remap_memory(int fd, const char* file_name, size_t file_offset, | |
342 char *addr, size_t bytes, bool read_only, | |
343 bool allow_exec); | |
344 static bool unmap_memory(char *addr, size_t bytes); | |
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345 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); |
0 | 346 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); |
347 | |
348 // NUMA-specific interface | |
141 | 349 static bool numa_has_static_binding(); |
350 static bool numa_has_group_homing(); | |
351 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); | |
0 | 352 static void numa_make_global(char *addr, size_t bytes); |
353 static size_t numa_get_groups_num(); | |
354 static size_t numa_get_leaf_groups(int *ids, size_t size); | |
355 static bool numa_topology_changed(); | |
356 static int numa_get_group_id(); | |
357 | |
358 // Page manipulation | |
359 struct page_info { | |
360 size_t size; | |
361 int lgrp_id; | |
362 }; | |
363 static bool get_page_info(char *start, page_info* info); | |
364 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); | |
365 | |
366 static char* non_memory_address_word(); | |
367 // reserve, commit and pin the entire memory region | |
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368 static char* reserve_memory_special(size_t size, size_t alignment, |
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369 char* addr, bool executable); |
0 | 370 static bool release_memory_special(char* addr, size_t bytes); |
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371 static void large_page_init(); |
0 | 372 static size_t large_page_size(); |
373 static bool can_commit_large_page_memory(); | |
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374 static bool can_execute_large_page_memory(); |
0 | 375 |
376 // OS interface to polling page | |
377 static address get_polling_page() { return _polling_page; } | |
378 static void set_polling_page(address page) { _polling_page = page; } | |
379 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } | |
380 static void make_polling_page_unreadable(); | |
381 static void make_polling_page_readable(); | |
382 | |
383 // Routines used to serialize the thread state without using membars | |
384 static void serialize_thread_states(); | |
385 | |
386 // Since we write to the serialize page from every thread, we | |
387 // want stores to be on unique cache lines whenever possible | |
388 // in order to minimize CPU cross talk. We pre-compute the | |
389 // amount to shift the thread* to make this offset unique to | |
390 // each thread. | |
391 static int get_serialize_page_shift_count() { | |
392 return SerializePageShiftCount; | |
393 } | |
394 | |
395 static void set_serialize_page_mask(uintptr_t mask) { | |
396 _serialize_page_mask = mask; | |
397 } | |
398 | |
399 static unsigned int get_serialize_page_mask() { | |
400 return _serialize_page_mask; | |
401 } | |
402 | |
403 static void set_memory_serialize_page(address page); | |
404 | |
405 static address get_memory_serialize_page() { | |
406 return (address)_mem_serialize_page; | |
407 } | |
408 | |
409 static inline void write_memory_serialize_page(JavaThread *thread) { | |
410 uintptr_t page_offset = ((uintptr_t)thread >> | |
411 get_serialize_page_shift_count()) & | |
412 get_serialize_page_mask(); | |
413 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; | |
414 } | |
415 | |
416 static bool is_memory_serialize_page(JavaThread *thread, address addr) { | |
417 if (UseMembar) return false; | |
1078 | 418 // Previously this function calculated the exact address of this |
419 // thread's serialize page, and checked if the faulting address | |
420 // was equal. However, some platforms mask off faulting addresses | |
421 // to the page size, so now we just check that the address is | |
422 // within the page. This makes the thread argument unnecessary, | |
423 // but we retain the NULL check to preserve existing behaviour. | |
0 | 424 if (thread == NULL) return false; |
1078 | 425 address page = (address) _mem_serialize_page; |
426 return addr >= page && addr < (page + os::vm_page_size()); | |
0 | 427 } |
428 | |
429 static void block_on_serialize_page_trap(); | |
430 | |
431 // threads | |
432 | |
433 enum ThreadType { | |
434 vm_thread, | |
435 cgc_thread, // Concurrent GC thread | |
436 pgc_thread, // Parallel GC thread | |
437 java_thread, | |
438 compiler_thread, | |
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439 watcher_thread, |
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440 os_thread |
0 | 441 }; |
442 | |
443 static bool create_thread(Thread* thread, | |
444 ThreadType thr_type, | |
445 size_t stack_size = 0); | |
446 static bool create_main_thread(JavaThread* thread); | |
447 static bool create_attached_thread(JavaThread* thread); | |
448 static void pd_start_thread(Thread* thread); | |
449 static void start_thread(Thread* thread); | |
450 | |
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451 static void initialize_thread(Thread* thr); |
0 | 452 static void free_thread(OSThread* osthread); |
453 | |
454 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit | |
455 static intx current_thread_id(); | |
456 static int current_process_id(); | |
457 static int sleep(Thread* thread, jlong ms, bool interruptable); | |
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458 // Short standalone OS sleep suitable for slow path spin loop. |
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459 // Ignores Thread.interrupt() (so keep it short). |
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460 // ms = 0, will sleep for the least amount of time allowed by the OS. |
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461 static void naked_short_sleep(jlong ms); |
0 | 462 static void infinite_sleep(); // never returns, use with CAUTION |
463 static void yield(); // Yields to all threads with same priority | |
464 enum YieldResult { | |
465 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran | |
466 YIELD_NONEREADY = 0, // No other runnable/ready threads. | |
467 // platform-specific yield return immediately | |
468 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY | |
469 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" | |
470 // yield that can be used in lieu of blocking. | |
471 } ; | |
472 static YieldResult NakedYield () ; | |
473 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority | |
474 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing | |
475 static OSReturn set_priority(Thread* thread, ThreadPriority priority); | |
476 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); | |
477 | |
478 static void interrupt(Thread* thread); | |
479 static bool is_interrupted(Thread* thread, bool clear_interrupted); | |
480 | |
481 static int pd_self_suspend_thread(Thread* thread); | |
482 | |
483 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); | |
484 static frame fetch_frame_from_context(void* ucVoid); | |
485 | |
486 static ExtendedPC get_thread_pc(Thread *thread); | |
487 static void breakpoint(); | |
488 | |
489 static address current_stack_pointer(); | |
490 static address current_stack_base(); | |
491 static size_t current_stack_size(); | |
492 | |
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493 static void verify_stack_alignment() PRODUCT_RETURN; |
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494 |
0 | 495 static int message_box(const char* title, const char* message); |
496 static char* do_you_want_to_debug(const char* message); | |
497 | |
498 // run cmd in a separate process and return its exit code; or -1 on failures | |
499 static int fork_and_exec(char *cmd); | |
500 | |
501 // os::exit() is merged with vm_exit() | |
502 // static void exit(int num); | |
503 | |
504 // Terminate the VM, but don't exit the process | |
505 static void shutdown(); | |
506 | |
507 // Terminate with an error. Default is to generate a core file on platforms | |
508 // that support such things. This calls shutdown() and then aborts. | |
509 static void abort(bool dump_core = true); | |
510 | |
511 // Die immediately, no exit hook, no abort hook, no cleanup. | |
512 static void die(); | |
513 | |
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514 // File i/o operations |
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515 static const int default_file_open_flags(); |
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516 static int open(const char *path, int oflag, int mode); |
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517 static FILE* open(int fd, const char* mode); |
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518 static int close(int fd); |
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519 static jlong lseek(int fd, jlong offset, int whence); |
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520 static char* native_path(char *path); |
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521 static int ftruncate(int fd, jlong length); |
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522 static int fsync(int fd); |
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523 static int available(int fd, jlong *bytes); |
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524 |
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525 //File i/o operations |
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526 |
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527 static size_t read(int fd, void *buf, unsigned int nBytes); |
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528 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); |
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529 static size_t write(int fd, const void *buf, unsigned int nBytes); |
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530 |
0 | 531 // Reading directories. |
532 static DIR* opendir(const char* dirname); | |
533 static int readdir_buf_size(const char *path); | |
534 static struct dirent* readdir(DIR* dirp, dirent* dbuf); | |
535 static int closedir(DIR* dirp); | |
536 | |
537 // Dynamic library extension | |
538 static const char* dll_file_extension(); | |
539 | |
540 static const char* get_temp_directory(); | |
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541 static const char* get_current_directory(char *buf, size_t buflen); |
0 | 542 |
242 | 543 // Builds a platform-specific full library path given a ld path and lib name |
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544 // Returns true if buffer contains full path to existing file, false otherwise |
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545 static bool dll_build_name(char* buffer, size_t size, |
242 | 546 const char* pathname, const char* fname); |
547 | |
0 | 548 // Symbol lookup, find nearest function name; basically it implements |
549 // dladdr() for all platforms. Name of the nearest function is copied | |
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550 // to buf. Distance from its base address is optionally returned as offset. |
0 | 551 // If function name is not found, buf[0] is set to '\0' and offset is |
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552 // set to -1 (if offset is non-NULL). |
0 | 553 static bool dll_address_to_function_name(address addr, char* buf, |
554 int buflen, int* offset); | |
555 | |
556 // Locate DLL/DSO. On success, full path of the library is copied to | |
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557 // buf, and offset is optionally set to be the distance between addr |
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558 // and the library's base address. On failure, buf[0] is set to '\0' |
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559 // and offset is set to -1 (if offset is non-NULL). |
0 | 560 static bool dll_address_to_library_name(address addr, char* buf, |
561 int buflen, int* offset); | |
562 | |
563 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. | |
564 static bool address_is_in_vm(address addr); | |
565 | |
566 // Loads .dll/.so and | |
567 // in case of error it checks if .dll/.so was built for the | |
568 // same architecture as Hotspot is running on | |
569 static void* dll_load(const char *name, char *ebuf, int ebuflen); | |
570 | |
242 | 571 // lookup symbol in a shared library |
572 static void* dll_lookup(void* handle, const char* name); | |
573 | |
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574 // Unload library |
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575 static void dll_unload(void *lib); |
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576 |
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577 // Return the handle of this process |
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578 static void* get_default_process_handle(); |
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579 |
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580 // Check for static linked agent library |
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581 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], |
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582 size_t syms_len); |
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583 |
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584 // Find agent entry point |
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585 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib, |
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586 const char *syms[], size_t syms_len); |
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587 |
0 | 588 // Print out system information; they are called by fatal error handler. |
589 // Output format may be different on different platforms. | |
590 static void print_os_info(outputStream* st); | |
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591 static void print_os_info_brief(outputStream* st); |
0 | 592 static void print_cpu_info(outputStream* st); |
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593 static void pd_print_cpu_info(outputStream* st); |
0 | 594 static void print_memory_info(outputStream* st); |
595 static void print_dll_info(outputStream* st); | |
596 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); | |
597 static void print_context(outputStream* st, void* context); | |
1907 | 598 static void print_register_info(outputStream* st, void* context); |
0 | 599 static void print_siginfo(outputStream* st, void* siginfo); |
600 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); | |
601 static void print_date_and_time(outputStream* st); | |
602 | |
1907 | 603 static void print_location(outputStream* st, intptr_t x, bool verbose = false); |
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604 static size_t lasterror(char *buf, size_t len); |
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605 static int get_last_error(); |
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606 |
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607 // Determines whether the calling process is being debugged by a user-mode debugger. |
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608 static bool is_debugger_attached(); |
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609 |
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610 // wait for a key press if PauseAtExit is set |
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611 static void wait_for_keypress_at_exit(void); |
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612 |
0 | 613 // The following two functions are used by fatal error handler to trace |
614 // native (C) frames. They are not part of frame.hpp/frame.cpp because | |
615 // frame.hpp/cpp assume thread is JavaThread, and also because different | |
616 // OS/compiler may have different convention or provide different API to | |
617 // walk C frames. | |
618 // | |
619 // We don't attempt to become a debugger, so we only follow frames if that | |
620 // does not require a lookup in the unwind table, which is part of the binary | |
621 // file but may be unsafe to read after a fatal error. So on x86, we can | |
622 // only walk stack if %ebp is used as frame pointer; on ia64, it's not | |
623 // possible to walk C stack without having the unwind table. | |
624 static bool is_first_C_frame(frame *fr); | |
625 static frame get_sender_for_C_frame(frame *fr); | |
626 | |
627 // return current frame. pc() and sp() are set to NULL on failure. | |
628 static frame current_frame(); | |
629 | |
630 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); | |
631 | |
632 // returns a string to describe the exception/signal; | |
633 // returns NULL if exception_code is not an OS exception/signal. | |
634 static const char* exception_name(int exception_code, char* buf, size_t buflen); | |
635 | |
636 // Returns native Java library, loads if necessary | |
637 static void* native_java_library(); | |
638 | |
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639 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) |
0 | 640 static void jvm_path(char *buf, jint buflen); |
641 | |
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642 // Returns true if we are running in a headless jre. |
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643 static bool is_headless_jre(); |
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644 |
0 | 645 // JNI names |
646 static void print_jni_name_prefix_on(outputStream* st, int args_size); | |
647 static void print_jni_name_suffix_on(outputStream* st, int args_size); | |
648 | |
649 // File conventions | |
650 static const char* file_separator(); | |
651 static const char* line_separator(); | |
652 static const char* path_separator(); | |
653 | |
654 // Init os specific system properties values | |
655 static void init_system_properties_values(); | |
656 | |
657 // IO operations, non-JVM_ version. | |
658 static int stat(const char* path, struct stat* sbuf); | |
659 static bool dir_is_empty(const char* path); | |
660 | |
661 // IO operations on binary files | |
662 static int create_binary_file(const char* path, bool rewrite_existing); | |
663 static jlong current_file_offset(int fd); | |
664 static jlong seek_to_file_offset(int fd, jlong offset); | |
665 | |
666 // Thread Local Storage | |
667 static int allocate_thread_local_storage(); | |
668 static void thread_local_storage_at_put(int index, void* value); | |
669 static void* thread_local_storage_at(int index); | |
670 static void free_thread_local_storage(int index); | |
671 | |
20360 | 672 // Retrieve native stack frames. |
673 // Parameter: | |
674 // stack: an array to storage stack pointers. | |
675 // frames: size of above array. | |
676 // toSkip: number of stack frames to skip at the beginning. | |
677 // Return: number of stack frames captured. | |
678 static int get_native_stack(address* stack, int size, int toSkip = 0); | |
6197 | 679 |
0 | 680 // General allocation (must be MT-safe) |
20360 | 681 static void* malloc (size_t size, MEMFLAGS flags, const NativeCallStack& stack); |
682 static void* malloc (size_t size, MEMFLAGS flags); | |
683 static void* realloc (void *memblock, size_t size, MEMFLAGS flag, const NativeCallStack& stack); | |
684 static void* realloc (void *memblock, size_t size, MEMFLAGS flag); | |
685 | |
6197 | 686 static void free (void *memblock, MEMFLAGS flags = mtNone); |
0 | 687 static bool check_heap(bool force = false); // verify C heap integrity |
6197 | 688 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup |
0 | 689 |
690 #ifndef PRODUCT | |
2250 | 691 static julong num_mallocs; // # of calls to malloc/realloc |
692 static julong alloc_bytes; // # of bytes allocated | |
693 static julong num_frees; // # of calls to free | |
694 static julong free_bytes; // # of bytes freed | |
0 | 695 #endif |
696 | |
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697 // SocketInterface (ex HPI SocketInterface ) |
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698 static int socket(int domain, int type, int protocol); |
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699 static int socket_close(int fd); |
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700 static int socket_shutdown(int fd, int howto); |
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701 static int recv(int fd, char* buf, size_t nBytes, uint flags); |
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702 static int send(int fd, char* buf, size_t nBytes, uint flags); |
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703 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); |
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704 static int timeout(int fd, long timeout); |
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705 static int listen(int fd, int count); |
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706 static int connect(int fd, struct sockaddr* him, socklen_t len); |
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707 static int bind(int fd, struct sockaddr* him, socklen_t len); |
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708 static int accept(int fd, struct sockaddr* him, socklen_t* len); |
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709 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, |
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710 struct sockaddr* from, socklen_t* fromlen); |
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711 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); |
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712 static int sendto(int fd, char* buf, size_t len, uint flags, |
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713 struct sockaddr* to, socklen_t tolen); |
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714 static int socket_available(int fd, jint* pbytes); |
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715 |
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716 static int get_sock_opt(int fd, int level, int optname, |
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717 char* optval, socklen_t* optlen); |
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718 static int set_sock_opt(int fd, int level, int optname, |
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719 const char* optval, socklen_t optlen); |
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720 static int get_host_name(char* name, int namelen); |
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721 |
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722 static struct hostent* get_host_by_name(char* name); |
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723 |
0 | 724 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) |
725 static void signal_init(); | |
726 static void signal_init_pd(); | |
727 static void signal_notify(int signal_number); | |
728 static void* signal(int signal_number, void* handler); | |
729 static void signal_raise(int signal_number); | |
730 static int signal_wait(); | |
731 static int signal_lookup(); | |
732 static void* user_handler(); | |
733 static void terminate_signal_thread(); | |
734 static int sigexitnum_pd(); | |
735 | |
736 // random number generation | |
737 static long random(); // return 32bit pseudorandom number | |
738 static void init_random(long initval); // initialize random sequence | |
739 | |
740 // Structured OS Exception support | |
741 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
742 | |
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743 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits |
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744 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); |
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745 |
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746 // Get the default path to the core file |
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747 // Returns the length of the string |
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748 static int get_core_path(char* buffer, size_t bufferSize); |
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749 |
0 | 750 // JVMTI & JVM monitoring and management support |
751 // The thread_cpu_time() and current_thread_cpu_time() are only | |
752 // supported if is_thread_cpu_time_supported() returns true. | |
753 // They are not supported on Solaris T1. | |
754 | |
755 // Thread CPU Time - return the fast estimate on a platform | |
756 // On Solaris - call gethrvtime (fast) - user time only | |
757 // On Linux - fast clock_gettime where available - user+sys | |
758 // - otherwise: very slow /proc fs - user+sys | |
759 // On Windows - GetThreadTimes - user+sys | |
760 static jlong current_thread_cpu_time(); | |
761 static jlong thread_cpu_time(Thread* t); | |
762 | |
763 // Thread CPU Time with user_sys_cpu_time parameter. | |
764 // | |
765 // If user_sys_cpu_time is true, user+sys time is returned. | |
766 // Otherwise, only user time is returned | |
767 static jlong current_thread_cpu_time(bool user_sys_cpu_time); | |
768 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); | |
769 | |
770 // Return a bunch of info about the timers. | |
771 // Note that the returned info for these two functions may be different | |
772 // on some platforms | |
773 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
774 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
775 | |
776 static bool is_thread_cpu_time_supported(); | |
777 | |
778 // System loadavg support. Returns -1 if load average cannot be obtained. | |
779 static int loadavg(double loadavg[], int nelem); | |
780 | |
781 // Hook for os specific jvm options that we don't want to abort on seeing | |
782 static bool obsolete_option(const JavaVMOption *option); | |
783 | |
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784 // Extensions |
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785 #include "runtime/os_ext.hpp" |
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786 |
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787 public: |
11151 | 788 class CrashProtectionCallback : public StackObj { |
789 public: | |
790 virtual void call() = 0; | |
791 }; | |
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792 |
0 | 793 // Platform dependent stuff |
1972 | 794 #ifdef TARGET_OS_FAMILY_linux |
795 # include "os_linux.hpp" | |
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796 # include "os_posix.hpp" |
1972 | 797 #endif |
798 #ifdef TARGET_OS_FAMILY_solaris | |
799 # include "os_solaris.hpp" | |
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800 # include "os_posix.hpp" |
1972 | 801 #endif |
802 #ifdef TARGET_OS_FAMILY_windows | |
803 # include "os_windows.hpp" | |
804 #endif | |
14411 | 805 #ifdef TARGET_OS_FAMILY_aix |
806 # include "os_aix.hpp" | |
807 # include "os_posix.hpp" | |
808 #endif | |
3960 | 809 #ifdef TARGET_OS_FAMILY_bsd |
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810 # include "os_posix.hpp" |
3960 | 811 # include "os_bsd.hpp" |
812 #endif | |
1972 | 813 #ifdef TARGET_OS_ARCH_linux_x86 |
814 # include "os_linux_x86.hpp" | |
815 #endif | |
816 #ifdef TARGET_OS_ARCH_linux_sparc | |
817 # include "os_linux_sparc.hpp" | |
818 #endif | |
819 #ifdef TARGET_OS_ARCH_linux_zero | |
820 # include "os_linux_zero.hpp" | |
821 #endif | |
822 #ifdef TARGET_OS_ARCH_solaris_x86 | |
823 # include "os_solaris_x86.hpp" | |
824 #endif | |
825 #ifdef TARGET_OS_ARCH_solaris_sparc | |
826 # include "os_solaris_sparc.hpp" | |
827 #endif | |
828 #ifdef TARGET_OS_ARCH_windows_x86 | |
829 # include "os_windows_x86.hpp" | |
830 #endif | |
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831 #ifdef TARGET_OS_ARCH_linux_arm |
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832 # include "os_linux_arm.hpp" |
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833 #endif |
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834 #ifdef TARGET_OS_ARCH_linux_ppc |
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835 # include "os_linux_ppc.hpp" |
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836 #endif |
14411 | 837 #ifdef TARGET_OS_ARCH_aix_ppc |
838 # include "os_aix_ppc.hpp" | |
839 #endif | |
3960 | 840 #ifdef TARGET_OS_ARCH_bsd_x86 |
841 # include "os_bsd_x86.hpp" | |
842 #endif | |
843 #ifdef TARGET_OS_ARCH_bsd_zero | |
844 # include "os_bsd_zero.hpp" | |
845 #endif | |
1972 | 846 |
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847 public: |
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848 #ifndef PLATFORM_PRINT_NATIVE_STACK |
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849 // No platform-specific code for printing the native stack. |
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850 static bool platform_print_native_stack(outputStream* st, void* context, |
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851 char *buf, int buf_size) { |
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852 return false; |
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853 } |
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854 #endif |
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855 |
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856 // debugging support (mostly used by debug.cpp but also fatal error handler) |
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857 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address |
0 | 858 |
859 static bool dont_yield(); // when true, JVM_Yield() is nop | |
860 static void print_statistics(); | |
861 | |
862 // Thread priority helpers (implemented in OS-specific part) | |
863 static OSReturn set_native_priority(Thread* thread, int native_prio); | |
864 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); | |
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865 static int java_to_os_priority[CriticalPriority + 1]; |
0 | 866 // Hint to the underlying OS that a task switch would not be good. |
867 // Void return because it's a hint and can fail. | |
868 static void hint_no_preempt(); | |
869 | |
870 // Used at creation if requested by the diagnostic flag PauseAtStartup. | |
871 // Causes the VM to wait until an external stimulus has been applied | |
872 // (for Unix, that stimulus is a signal, for Windows, an external | |
873 // ResumeThread call) | |
874 static void pause(); | |
875 | |
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876 // Builds a platform dependent Agent_OnLoad_<libname> function name |
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877 // which is used to find statically linked in agents. |
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878 static char* build_agent_function_name(const char *sym, const char *cname, |
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879 bool is_absolute_path); |
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880 |
10405 | 881 class SuspendedThreadTaskContext { |
882 public: | |
883 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} | |
884 Thread* thread() const { return _thread; } | |
885 void* ucontext() const { return _ucontext; } | |
886 private: | |
887 Thread* _thread; | |
888 void* _ucontext; | |
889 }; | |
890 | |
891 class SuspendedThreadTask { | |
892 public: | |
893 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} | |
894 virtual ~SuspendedThreadTask() {} | |
895 void run(); | |
896 bool is_done() { return _done; } | |
897 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; | |
898 protected: | |
899 private: | |
900 void internal_do_task(); | |
901 Thread* _thread; | |
902 bool _done; | |
903 }; | |
904 | |
905 #ifndef TARGET_OS_FAMILY_windows | |
906 // Suspend/resume support | |
907 // Protocol: | |
908 // | |
909 // a thread starts in SR_RUNNING | |
910 // | |
911 // SR_RUNNING can go to | |
912 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it | |
913 // SR_SUSPEND_REQUEST can go to | |
914 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) | |
915 // * SR_SUSPENDED if the stopped thread receives the signal and switches state | |
916 // SR_SUSPENDED can go to | |
917 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume | |
918 // SR_WAKEUP_REQUEST can go to | |
919 // * SR_RUNNING when the stopped thread receives the signal | |
920 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) | |
921 class SuspendResume { | |
922 public: | |
923 enum State { | |
924 SR_RUNNING, | |
925 SR_SUSPEND_REQUEST, | |
926 SR_SUSPENDED, | |
927 SR_WAKEUP_REQUEST | |
928 }; | |
929 | |
930 private: | |
931 volatile State _state; | |
932 | |
933 private: | |
934 /* try to switch state from state "from" to state "to" | |
935 * returns the state set after the method is complete | |
936 */ | |
937 State switch_state(State from, State to); | |
938 | |
939 public: | |
940 SuspendResume() : _state(SR_RUNNING) { } | |
941 | |
942 State state() const { return _state; } | |
943 | |
944 State request_suspend() { | |
945 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); | |
946 } | |
947 | |
948 State cancel_suspend() { | |
949 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); | |
950 } | |
951 | |
952 State suspended() { | |
953 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); | |
954 } | |
955 | |
956 State request_wakeup() { | |
957 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); | |
958 } | |
959 | |
960 State running() { | |
961 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); | |
962 } | |
963 | |
964 bool is_running() const { | |
965 return _state == SR_RUNNING; | |
966 } | |
967 | |
968 bool is_suspend_request() const { | |
969 return _state == SR_SUSPEND_REQUEST; | |
970 } | |
971 | |
972 bool is_suspended() const { | |
973 return _state == SR_SUSPENDED; | |
974 } | |
975 }; | |
976 #endif | |
977 | |
978 | |
0 | 979 protected: |
980 static long _rand_seed; // seed for random number generator | |
981 static int _processor_count; // number of processors | |
982 | |
983 static char* format_boot_path(const char* format_string, | |
984 const char* home, | |
985 int home_len, | |
986 char fileSep, | |
987 char pathSep); | |
988 static bool set_boot_path(char fileSep, char pathSep); | |
691 | 989 static char** split_path(const char* path, int* n); |
11151 | 990 |
0 | 991 }; |
992 | |
993 // Note that "PAUSE" is almost always used with synchronization | |
994 // so arguably we should provide Atomic::SpinPause() instead | |
995 // of the global SpinPause() with C linkage. | |
996 // It'd also be eligible for inlining on many platforms. | |
997 | |
11127 | 998 extern "C" int SpinPause(); |
1972 | 999 |
1000 #endif // SHARE_VM_RUNTIME_OS_HPP |