Mercurial > hg > truffle
annotate src/share/vm/runtime/os.cpp @ 2491:0654ee04b214
Merge with OpenJDK.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
---|---|
date | Fri, 22 Apr 2011 15:30:53 +0200 |
parents | a2babfb34c24 677234770800 |
children | 04b9a2566eec |
rev | line source |
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0 | 1 /* |
2250 | 2 * Copyright (c) 1997, 2011, 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 * | |
1552
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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 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/icBuffer.hpp" | |
31 #include "code/vtableStubs.hpp" | |
32 #include "gc_implementation/shared/vmGCOperations.hpp" | |
33 #include "interpreter/interpreter.hpp" | |
34 #include "memory/allocation.inline.hpp" | |
35 #include "oops/oop.inline.hpp" | |
36 #include "prims/jvm.h" | |
37 #include "prims/jvm_misc.hpp" | |
38 #include "prims/privilegedStack.hpp" | |
39 #include "runtime/arguments.hpp" | |
40 #include "runtime/frame.inline.hpp" | |
41 #include "runtime/interfaceSupport.hpp" | |
42 #include "runtime/java.hpp" | |
43 #include "runtime/javaCalls.hpp" | |
44 #include "runtime/mutexLocker.hpp" | |
45 #include "runtime/os.hpp" | |
46 #include "runtime/stubRoutines.hpp" | |
47 #include "services/attachListener.hpp" | |
48 #include "services/threadService.hpp" | |
49 #include "utilities/defaultStream.hpp" | |
50 #include "utilities/events.hpp" | |
51 #ifdef TARGET_OS_FAMILY_linux | |
52 # include "os_linux.inline.hpp" | |
53 # include "thread_linux.inline.hpp" | |
54 #endif | |
55 #ifdef TARGET_OS_FAMILY_solaris | |
56 # include "os_solaris.inline.hpp" | |
57 # include "thread_solaris.inline.hpp" | |
58 #endif | |
59 #ifdef TARGET_OS_FAMILY_windows | |
60 # include "os_windows.inline.hpp" | |
61 # include "thread_windows.inline.hpp" | |
62 #endif | |
0 | 63 |
64 # include <signal.h> | |
65 | |
66 OSThread* os::_starting_thread = NULL; | |
67 address os::_polling_page = NULL; | |
68 volatile int32_t* os::_mem_serialize_page = NULL; | |
69 uintptr_t os::_serialize_page_mask = 0; | |
70 long os::_rand_seed = 1; | |
71 int os::_processor_count = 0; | |
72 size_t os::_page_sizes[os::page_sizes_max]; | |
73 | |
74 #ifndef PRODUCT | |
2250 | 75 julong os::num_mallocs = 0; // # of calls to malloc/realloc |
76 julong os::alloc_bytes = 0; // # of bytes allocated | |
77 julong os::num_frees = 0; // # of calls to free | |
78 julong os::free_bytes = 0; // # of bytes freed | |
0 | 79 #endif |
80 | |
81 // Fill in buffer with current local time as an ISO-8601 string. | |
82 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. | |
83 // Returns buffer, or NULL if it failed. | |
84 // This would mostly be a call to | |
85 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) | |
86 // except that on Windows the %z behaves badly, so we do it ourselves. | |
87 // Also, people wanted milliseconds on there, | |
88 // and strftime doesn't do milliseconds. | |
89 char* os::iso8601_time(char* buffer, size_t buffer_length) { | |
90 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" | |
91 // 1 2 | |
92 // 12345678901234567890123456789 | |
93 static const char* iso8601_format = | |
94 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d"; | |
95 static const size_t needed_buffer = 29; | |
96 | |
97 // Sanity check the arguments | |
98 if (buffer == NULL) { | |
99 assert(false, "NULL buffer"); | |
100 return NULL; | |
101 } | |
102 if (buffer_length < needed_buffer) { | |
103 assert(false, "buffer_length too small"); | |
104 return NULL; | |
105 } | |
106 // Get the current time | |
61 | 107 jlong milliseconds_since_19700101 = javaTimeMillis(); |
0 | 108 const int milliseconds_per_microsecond = 1000; |
109 const time_t seconds_since_19700101 = | |
110 milliseconds_since_19700101 / milliseconds_per_microsecond; | |
111 const int milliseconds_after_second = | |
112 milliseconds_since_19700101 % milliseconds_per_microsecond; | |
113 // Convert the time value to a tm and timezone variable | |
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114 struct tm time_struct; |
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115 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { |
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116 assert(false, "Failed localtime_pd"); |
0 | 117 return NULL; |
118 } | |
119 const time_t zone = timezone; | |
120 | |
121 // If daylight savings time is in effect, | |
122 // we are 1 hour East of our time zone | |
123 const time_t seconds_per_minute = 60; | |
124 const time_t minutes_per_hour = 60; | |
125 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; | |
126 time_t UTC_to_local = zone; | |
127 if (time_struct.tm_isdst > 0) { | |
128 UTC_to_local = UTC_to_local - seconds_per_hour; | |
129 } | |
130 // Compute the time zone offset. | |
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131 // localtime_pd() sets timezone to the difference (in seconds) |
0 | 132 // between UTC and and local time. |
133 // ISO 8601 says we need the difference between local time and UTC, | |
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134 // we change the sign of the localtime_pd() result. |
0 | 135 const time_t local_to_UTC = -(UTC_to_local); |
136 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. | |
137 char sign_local_to_UTC = '+'; | |
138 time_t abs_local_to_UTC = local_to_UTC; | |
139 if (local_to_UTC < 0) { | |
140 sign_local_to_UTC = '-'; | |
141 abs_local_to_UTC = -(abs_local_to_UTC); | |
142 } | |
143 // Convert time zone offset seconds to hours and minutes. | |
144 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); | |
145 const time_t zone_min = | |
146 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); | |
147 | |
148 // Print an ISO 8601 date and time stamp into the buffer | |
149 const int year = 1900 + time_struct.tm_year; | |
150 const int month = 1 + time_struct.tm_mon; | |
151 const int printed = jio_snprintf(buffer, buffer_length, iso8601_format, | |
152 year, | |
153 month, | |
154 time_struct.tm_mday, | |
155 time_struct.tm_hour, | |
156 time_struct.tm_min, | |
157 time_struct.tm_sec, | |
158 milliseconds_after_second, | |
159 sign_local_to_UTC, | |
160 zone_hours, | |
161 zone_min); | |
162 if (printed == 0) { | |
163 assert(false, "Failed jio_printf"); | |
164 return NULL; | |
165 } | |
166 return buffer; | |
167 } | |
168 | |
169 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { | |
170 #ifdef ASSERT | |
171 if (!(!thread->is_Java_thread() || | |
172 Thread::current() == thread || | |
173 Threads_lock->owned_by_self() | |
174 || thread->is_Compiler_thread() | |
175 )) { | |
176 assert(false, "possibility of dangling Thread pointer"); | |
177 } | |
178 #endif | |
179 | |
180 if (p >= MinPriority && p <= MaxPriority) { | |
181 int priority = java_to_os_priority[p]; | |
182 return set_native_priority(thread, priority); | |
183 } else { | |
184 assert(false, "Should not happen"); | |
185 return OS_ERR; | |
186 } | |
187 } | |
188 | |
189 | |
190 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { | |
191 int p; | |
192 int os_prio; | |
193 OSReturn ret = get_native_priority(thread, &os_prio); | |
194 if (ret != OS_OK) return ret; | |
195 | |
196 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; | |
197 priority = (ThreadPriority)p; | |
198 return OS_OK; | |
199 } | |
200 | |
201 | |
202 // --------------------- sun.misc.Signal (optional) --------------------- | |
203 | |
204 | |
205 // SIGBREAK is sent by the keyboard to query the VM state | |
206 #ifndef SIGBREAK | |
207 #define SIGBREAK SIGQUIT | |
208 #endif | |
209 | |
210 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. | |
211 | |
212 | |
213 static void signal_thread_entry(JavaThread* thread, TRAPS) { | |
214 os::set_priority(thread, NearMaxPriority); | |
215 while (true) { | |
216 int sig; | |
217 { | |
218 // FIXME : Currently we have not decieded what should be the status | |
219 // for this java thread blocked here. Once we decide about | |
220 // that we should fix this. | |
221 sig = os::signal_wait(); | |
222 } | |
223 if (sig == os::sigexitnum_pd()) { | |
224 // Terminate the signal thread | |
225 return; | |
226 } | |
227 | |
228 switch (sig) { | |
229 case SIGBREAK: { | |
230 // Check if the signal is a trigger to start the Attach Listener - in that | |
231 // case don't print stack traces. | |
232 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { | |
233 continue; | |
234 } | |
235 // Print stack traces | |
236 // Any SIGBREAK operations added here should make sure to flush | |
237 // the output stream (e.g. tty->flush()) after output. See 4803766. | |
238 // Each module also prints an extra carriage return after its output. | |
239 VM_PrintThreads op; | |
240 VMThread::execute(&op); | |
241 VM_PrintJNI jni_op; | |
242 VMThread::execute(&jni_op); | |
243 VM_FindDeadlocks op1(tty); | |
244 VMThread::execute(&op1); | |
245 Universe::print_heap_at_SIGBREAK(); | |
246 if (PrintClassHistogram) { | |
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247 VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */, |
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248 true /* need_prologue */); |
0 | 249 VMThread::execute(&op1); |
250 } | |
251 if (JvmtiExport::should_post_data_dump()) { | |
252 JvmtiExport::post_data_dump(); | |
253 } | |
254 break; | |
255 } | |
256 default: { | |
257 // Dispatch the signal to java | |
258 HandleMark hm(THREAD); | |
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259 klassOop k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_Signal(), THREAD); |
0 | 260 KlassHandle klass (THREAD, k); |
261 if (klass.not_null()) { | |
262 JavaValue result(T_VOID); | |
263 JavaCallArguments args; | |
264 args.push_int(sig); | |
265 JavaCalls::call_static( | |
266 &result, | |
267 klass, | |
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268 vmSymbols::dispatch_name(), |
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269 vmSymbols::int_void_signature(), |
0 | 270 &args, |
271 THREAD | |
272 ); | |
273 } | |
274 if (HAS_PENDING_EXCEPTION) { | |
275 // tty is initialized early so we don't expect it to be null, but | |
276 // if it is we can't risk doing an initialization that might | |
277 // trigger additional out-of-memory conditions | |
278 if (tty != NULL) { | |
279 char klass_name[256]; | |
280 char tmp_sig_name[16]; | |
281 const char* sig_name = "UNKNOWN"; | |
282 instanceKlass::cast(PENDING_EXCEPTION->klass())-> | |
283 name()->as_klass_external_name(klass_name, 256); | |
284 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) | |
285 sig_name = tmp_sig_name; | |
286 warning("Exception %s occurred dispatching signal %s to handler" | |
287 "- the VM may need to be forcibly terminated", | |
288 klass_name, sig_name ); | |
289 } | |
290 CLEAR_PENDING_EXCEPTION; | |
291 } | |
292 } | |
293 } | |
294 } | |
295 } | |
296 | |
297 | |
298 void os::signal_init() { | |
299 if (!ReduceSignalUsage) { | |
300 // Setup JavaThread for processing signals | |
301 EXCEPTION_MARK; | |
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302 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 303 instanceKlassHandle klass (THREAD, k); |
304 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
305 | |
306 const char thread_name[] = "Signal Dispatcher"; | |
307 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
308 | |
309 // Initialize thread_oop to put it into the system threadGroup | |
310 Handle thread_group (THREAD, Universe::system_thread_group()); | |
311 JavaValue result(T_VOID); | |
312 JavaCalls::call_special(&result, thread_oop, | |
313 klass, | |
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314 vmSymbols::object_initializer_name(), |
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315 vmSymbols::threadgroup_string_void_signature(), |
0 | 316 thread_group, |
317 string, | |
318 CHECK); | |
319 | |
1142 | 320 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 321 JavaCalls::call_special(&result, |
322 thread_group, | |
323 group, | |
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324 vmSymbols::add_method_name(), |
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325 vmSymbols::thread_void_signature(), |
0 | 326 thread_oop, // ARG 1 |
327 CHECK); | |
328 | |
329 os::signal_init_pd(); | |
330 | |
331 { MutexLocker mu(Threads_lock); | |
332 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); | |
333 | |
334 // At this point it may be possible that no osthread was created for the | |
335 // JavaThread due to lack of memory. We would have to throw an exception | |
336 // in that case. However, since this must work and we do not allow | |
337 // exceptions anyway, check and abort if this fails. | |
338 if (signal_thread == NULL || signal_thread->osthread() == NULL) { | |
339 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
340 "unable to create new native thread"); | |
341 } | |
342 | |
343 java_lang_Thread::set_thread(thread_oop(), signal_thread); | |
344 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
345 java_lang_Thread::set_daemon(thread_oop()); | |
346 | |
347 signal_thread->set_threadObj(thread_oop()); | |
348 Threads::add(signal_thread); | |
349 Thread::start(signal_thread); | |
350 } | |
351 // Handle ^BREAK | |
352 os::signal(SIGBREAK, os::user_handler()); | |
353 } | |
354 } | |
355 | |
356 | |
357 void os::terminate_signal_thread() { | |
358 if (!ReduceSignalUsage) | |
359 signal_notify(sigexitnum_pd()); | |
360 } | |
361 | |
362 | |
363 // --------------------- loading libraries --------------------- | |
364 | |
365 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); | |
366 extern struct JavaVM_ main_vm; | |
367 | |
368 static void* _native_java_library = NULL; | |
369 | |
370 void* os::native_java_library() { | |
371 if (_native_java_library == NULL) { | |
372 char buffer[JVM_MAXPATHLEN]; | |
373 char ebuf[1024]; | |
374 | |
242 | 375 // Try to load verify dll first. In 1.3 java dll depends on it and is not |
376 // always able to find it when the loading executable is outside the JDK. | |
0 | 377 // In order to keep working with 1.2 we ignore any loading errors. |
242 | 378 dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), "verify"); |
379 dll_load(buffer, ebuf, sizeof(ebuf)); | |
0 | 380 |
381 // Load java dll | |
242 | 382 dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), "java"); |
383 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); | |
0 | 384 if (_native_java_library == NULL) { |
385 vm_exit_during_initialization("Unable to load native library", ebuf); | |
386 } | |
242 | 387 } |
388 static jboolean onLoaded = JNI_FALSE; | |
389 if (onLoaded) { | |
390 // We may have to wait to fire OnLoad until TLS is initialized. | |
391 if (ThreadLocalStorage::is_initialized()) { | |
392 // The JNI_OnLoad handling is normally done by method load in | |
393 // java.lang.ClassLoader$NativeLibrary, but the VM loads the base library | |
394 // explicitly so we have to check for JNI_OnLoad as well | |
395 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; | |
396 JNI_OnLoad_t JNI_OnLoad = CAST_TO_FN_PTR( | |
397 JNI_OnLoad_t, dll_lookup(_native_java_library, onLoadSymbols[0])); | |
398 if (JNI_OnLoad != NULL) { | |
399 JavaThread* thread = JavaThread::current(); | |
400 ThreadToNativeFromVM ttn(thread); | |
401 HandleMark hm(thread); | |
402 jint ver = (*JNI_OnLoad)(&main_vm, NULL); | |
403 onLoaded = JNI_TRUE; | |
404 if (!Threads::is_supported_jni_version_including_1_1(ver)) { | |
405 vm_exit_during_initialization("Unsupported JNI version"); | |
406 } | |
0 | 407 } |
408 } | |
409 } | |
410 return _native_java_library; | |
411 } | |
412 | |
413 // --------------------- heap allocation utilities --------------------- | |
414 | |
415 char *os::strdup(const char *str) { | |
416 size_t size = strlen(str); | |
417 char *dup_str = (char *)malloc(size + 1); | |
418 if (dup_str == NULL) return NULL; | |
419 strcpy(dup_str, str); | |
420 return dup_str; | |
421 } | |
422 | |
423 | |
424 | |
425 #ifdef ASSERT | |
426 #define space_before (MallocCushion + sizeof(double)) | |
427 #define space_after MallocCushion | |
428 #define size_addr_from_base(p) (size_t*)(p + space_before - sizeof(size_t)) | |
429 #define size_addr_from_obj(p) ((size_t*)p - 1) | |
430 // MallocCushion: size of extra cushion allocated around objects with +UseMallocOnly | |
431 // NB: cannot be debug variable, because these aren't set from the command line until | |
432 // *after* the first few allocs already happened | |
433 #define MallocCushion 16 | |
434 #else | |
435 #define space_before 0 | |
436 #define space_after 0 | |
437 #define size_addr_from_base(p) should not use w/o ASSERT | |
438 #define size_addr_from_obj(p) should not use w/o ASSERT | |
439 #define MallocCushion 0 | |
440 #endif | |
441 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ | |
442 | |
443 #ifdef ASSERT | |
444 inline size_t get_size(void* obj) { | |
445 size_t size = *size_addr_from_obj(obj); | |
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446 if (size < 0) { |
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447 fatal(err_msg("free: size field of object #" PTR_FORMAT " was overwritten (" |
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448 SIZE_FORMAT ")", obj, size)); |
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449 } |
0 | 450 return size; |
451 } | |
452 | |
453 u_char* find_cushion_backwards(u_char* start) { | |
454 u_char* p = start; | |
455 while (p[ 0] != badResourceValue || p[-1] != badResourceValue || | |
456 p[-2] != badResourceValue || p[-3] != badResourceValue) p--; | |
457 // ok, we have four consecutive marker bytes; find start | |
458 u_char* q = p - 4; | |
459 while (*q == badResourceValue) q--; | |
460 return q + 1; | |
461 } | |
462 | |
463 u_char* find_cushion_forwards(u_char* start) { | |
464 u_char* p = start; | |
465 while (p[0] != badResourceValue || p[1] != badResourceValue || | |
466 p[2] != badResourceValue || p[3] != badResourceValue) p++; | |
467 // ok, we have four consecutive marker bytes; find end of cushion | |
468 u_char* q = p + 4; | |
469 while (*q == badResourceValue) q++; | |
470 return q - MallocCushion; | |
471 } | |
472 | |
473 void print_neighbor_blocks(void* ptr) { | |
474 // find block allocated before ptr (not entirely crash-proof) | |
475 if (MallocCushion < 4) { | |
476 tty->print_cr("### cannot find previous block (MallocCushion < 4)"); | |
477 return; | |
478 } | |
479 u_char* start_of_this_block = (u_char*)ptr - space_before; | |
480 u_char* end_of_prev_block_data = start_of_this_block - space_after -1; | |
481 // look for cushion in front of prev. block | |
482 u_char* start_of_prev_block = find_cushion_backwards(end_of_prev_block_data); | |
483 ptrdiff_t size = *size_addr_from_base(start_of_prev_block); | |
484 u_char* obj = start_of_prev_block + space_before; | |
485 if (size <= 0 ) { | |
486 // start is bad; mayhave been confused by OS data inbetween objects | |
487 // search one more backwards | |
488 start_of_prev_block = find_cushion_backwards(start_of_prev_block); | |
489 size = *size_addr_from_base(start_of_prev_block); | |
490 obj = start_of_prev_block + space_before; | |
491 } | |
492 | |
493 if (start_of_prev_block + space_before + size + space_after == start_of_this_block) { | |
2250 | 494 tty->print_cr("### previous object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
0 | 495 } else { |
2250 | 496 tty->print_cr("### previous object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
0 | 497 } |
498 | |
499 // now find successor block | |
500 u_char* start_of_next_block = (u_char*)ptr + *size_addr_from_obj(ptr) + space_after; | |
501 start_of_next_block = find_cushion_forwards(start_of_next_block); | |
502 u_char* next_obj = start_of_next_block + space_before; | |
503 ptrdiff_t next_size = *size_addr_from_base(start_of_next_block); | |
504 if (start_of_next_block[0] == badResourceValue && | |
505 start_of_next_block[1] == badResourceValue && | |
506 start_of_next_block[2] == badResourceValue && | |
507 start_of_next_block[3] == badResourceValue) { | |
2250 | 508 tty->print_cr("### next object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
0 | 509 } else { |
2250 | 510 tty->print_cr("### next object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
0 | 511 } |
512 } | |
513 | |
514 | |
515 void report_heap_error(void* memblock, void* bad, const char* where) { | |
2250 | 516 tty->print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT, os::num_mallocs, os::num_frees); |
517 tty->print_cr("## memory stomp: byte at " PTR_FORMAT " %s object " PTR_FORMAT, bad, where, memblock); | |
0 | 518 print_neighbor_blocks(memblock); |
519 fatal("memory stomping error"); | |
520 } | |
521 | |
522 void verify_block(void* memblock) { | |
523 size_t size = get_size(memblock); | |
524 if (MallocCushion) { | |
525 u_char* ptr = (u_char*)memblock - space_before; | |
526 for (int i = 0; i < MallocCushion; i++) { | |
527 if (ptr[i] != badResourceValue) { | |
528 report_heap_error(memblock, ptr+i, "in front of"); | |
529 } | |
530 } | |
531 u_char* end = (u_char*)memblock + size + space_after; | |
532 for (int j = -MallocCushion; j < 0; j++) { | |
533 if (end[j] != badResourceValue) { | |
534 report_heap_error(memblock, end+j, "after"); | |
535 } | |
536 } | |
537 } | |
538 } | |
539 #endif | |
540 | |
541 void* os::malloc(size_t size) { | |
2250 | 542 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
543 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
0 | 544 |
545 if (size == 0) { | |
546 // return a valid pointer if size is zero | |
547 // if NULL is returned the calling functions assume out of memory. | |
548 size = 1; | |
549 } | |
550 | |
551 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
552 u_char* ptr = (u_char*)::malloc(size + space_before + space_after); | |
553 #ifdef ASSERT | |
554 if (ptr == NULL) return NULL; | |
555 if (MallocCushion) { | |
556 for (u_char* p = ptr; p < ptr + MallocCushion; p++) *p = (u_char)badResourceValue; | |
557 u_char* end = ptr + space_before + size; | |
558 for (u_char* pq = ptr+MallocCushion; pq < end; pq++) *pq = (u_char)uninitBlockPad; | |
559 for (u_char* q = end; q < end + MallocCushion; q++) *q = (u_char)badResourceValue; | |
560 } | |
561 // put size just before data | |
562 *size_addr_from_base(ptr) = size; | |
563 #endif | |
564 u_char* memblock = ptr + space_before; | |
565 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 566 tty->print_cr("os::malloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
0 | 567 breakpoint(); |
568 } | |
569 debug_only(if (paranoid) verify_block(memblock)); | |
2250 | 570 if (PrintMalloc && tty != NULL) tty->print_cr("os::malloc " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
0 | 571 return memblock; |
572 } | |
573 | |
574 | |
575 void* os::realloc(void *memblock, size_t size) { | |
576 #ifndef ASSERT | |
2250 | 577 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
578 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
0 | 579 return ::realloc(memblock, size); |
580 #else | |
581 if (memblock == NULL) { | |
2250 | 582 return malloc(size); |
0 | 583 } |
584 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 585 tty->print_cr("os::realloc caught " PTR_FORMAT, memblock); |
0 | 586 breakpoint(); |
587 } | |
588 verify_block(memblock); | |
589 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
590 if (size == 0) return NULL; | |
591 // always move the block | |
592 void* ptr = malloc(size); | |
2250 | 593 if (PrintMalloc) tty->print_cr("os::remalloc " SIZE_FORMAT " bytes, " PTR_FORMAT " --> " PTR_FORMAT, size, memblock, ptr); |
0 | 594 // Copy to new memory if malloc didn't fail |
595 if ( ptr != NULL ) { | |
596 memcpy(ptr, memblock, MIN2(size, get_size(memblock))); | |
597 if (paranoid) verify_block(ptr); | |
598 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { | |
2250 | 599 tty->print_cr("os::realloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); |
0 | 600 breakpoint(); |
601 } | |
602 free(memblock); | |
603 } | |
604 return ptr; | |
605 #endif | |
606 } | |
607 | |
608 | |
609 void os::free(void *memblock) { | |
2250 | 610 NOT_PRODUCT(inc_stat_counter(&num_frees, 1)); |
0 | 611 #ifdef ASSERT |
612 if (memblock == NULL) return; | |
613 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 614 if (tty != NULL) tty->print_cr("os::free caught " PTR_FORMAT, memblock); |
0 | 615 breakpoint(); |
616 } | |
617 verify_block(memblock); | |
618 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
619 // Added by detlefs. | |
620 if (MallocCushion) { | |
621 u_char* ptr = (u_char*)memblock - space_before; | |
622 for (u_char* p = ptr; p < ptr + MallocCushion; p++) { | |
623 guarantee(*p == badResourceValue, | |
624 "Thing freed should be malloc result."); | |
625 *p = (u_char)freeBlockPad; | |
626 } | |
627 size_t size = get_size(memblock); | |
2250 | 628 inc_stat_counter(&free_bytes, size); |
0 | 629 u_char* end = ptr + space_before + size; |
630 for (u_char* q = end; q < end + MallocCushion; q++) { | |
631 guarantee(*q == badResourceValue, | |
632 "Thing freed should be malloc result."); | |
633 *q = (u_char)freeBlockPad; | |
634 } | |
2250 | 635 if (PrintMalloc && tty != NULL) |
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636 fprintf(stderr, "os::free " SIZE_FORMAT " bytes --> " PTR_FORMAT "\n", size, (uintptr_t)memblock); |
2250 | 637 } else if (PrintMalloc && tty != NULL) { |
638 // tty->print_cr("os::free %p", memblock); | |
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639 fprintf(stderr, "os::free " PTR_FORMAT "\n", (uintptr_t)memblock); |
0 | 640 } |
641 #endif | |
642 ::free((char*)memblock - space_before); | |
643 } | |
644 | |
645 void os::init_random(long initval) { | |
646 _rand_seed = initval; | |
647 } | |
648 | |
649 | |
650 long os::random() { | |
651 /* standard, well-known linear congruential random generator with | |
652 * next_rand = (16807*seed) mod (2**31-1) | |
653 * see | |
654 * (1) "Random Number Generators: Good Ones Are Hard to Find", | |
655 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), | |
656 * (2) "Two Fast Implementations of the 'Minimal Standard' Random | |
657 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. | |
658 */ | |
659 const long a = 16807; | |
660 const unsigned long m = 2147483647; | |
661 const long q = m / a; assert(q == 127773, "weird math"); | |
662 const long r = m % a; assert(r == 2836, "weird math"); | |
663 | |
664 // compute az=2^31p+q | |
665 unsigned long lo = a * (long)(_rand_seed & 0xFFFF); | |
666 unsigned long hi = a * (long)((unsigned long)_rand_seed >> 16); | |
667 lo += (hi & 0x7FFF) << 16; | |
668 | |
669 // if q overflowed, ignore the overflow and increment q | |
670 if (lo > m) { | |
671 lo &= m; | |
672 ++lo; | |
673 } | |
674 lo += hi >> 15; | |
675 | |
676 // if (p+q) overflowed, ignore the overflow and increment (p+q) | |
677 if (lo > m) { | |
678 lo &= m; | |
679 ++lo; | |
680 } | |
681 return (_rand_seed = lo); | |
682 } | |
683 | |
684 // The INITIALIZED state is distinguished from the SUSPENDED state because the | |
685 // conditions in which a thread is first started are different from those in which | |
686 // a suspension is resumed. These differences make it hard for us to apply the | |
687 // tougher checks when starting threads that we want to do when resuming them. | |
688 // However, when start_thread is called as a result of Thread.start, on a Java | |
689 // thread, the operation is synchronized on the Java Thread object. So there | |
690 // cannot be a race to start the thread and hence for the thread to exit while | |
691 // we are working on it. Non-Java threads that start Java threads either have | |
692 // to do so in a context in which races are impossible, or should do appropriate | |
693 // locking. | |
694 | |
695 void os::start_thread(Thread* thread) { | |
696 // guard suspend/resume | |
697 MutexLockerEx ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); | |
698 OSThread* osthread = thread->osthread(); | |
699 osthread->set_state(RUNNABLE); | |
700 pd_start_thread(thread); | |
701 } | |
702 | |
703 //--------------------------------------------------------------------------- | |
704 // Helper functions for fatal error handler | |
705 | |
706 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { | |
707 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); | |
708 | |
709 int cols = 0; | |
710 int cols_per_line = 0; | |
711 switch (unitsize) { | |
712 case 1: cols_per_line = 16; break; | |
713 case 2: cols_per_line = 8; break; | |
714 case 4: cols_per_line = 4; break; | |
715 case 8: cols_per_line = 2; break; | |
716 default: return; | |
717 } | |
718 | |
719 address p = start; | |
720 st->print(PTR_FORMAT ": ", start); | |
721 while (p < end) { | |
722 switch (unitsize) { | |
723 case 1: st->print("%02x", *(u1*)p); break; | |
724 case 2: st->print("%04x", *(u2*)p); break; | |
725 case 4: st->print("%08x", *(u4*)p); break; | |
726 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; | |
727 } | |
728 p += unitsize; | |
729 cols++; | |
730 if (cols >= cols_per_line && p < end) { | |
731 cols = 0; | |
732 st->cr(); | |
733 st->print(PTR_FORMAT ": ", p); | |
734 } else { | |
735 st->print(" "); | |
736 } | |
737 } | |
738 st->cr(); | |
739 } | |
740 | |
741 void os::print_environment_variables(outputStream* st, const char** env_list, | |
742 char* buffer, int len) { | |
743 if (env_list) { | |
744 st->print_cr("Environment Variables:"); | |
745 | |
746 for (int i = 0; env_list[i] != NULL; i++) { | |
747 if (getenv(env_list[i], buffer, len)) { | |
748 st->print(env_list[i]); | |
749 st->print("="); | |
750 st->print_cr(buffer); | |
751 } | |
752 } | |
753 } | |
754 } | |
755 | |
756 void os::print_cpu_info(outputStream* st) { | |
757 // cpu | |
758 st->print("CPU:"); | |
759 st->print("total %d", os::processor_count()); | |
760 // It's not safe to query number of active processors after crash | |
761 // st->print("(active %d)", os::active_processor_count()); | |
762 st->print(" %s", VM_Version::cpu_features()); | |
763 st->cr(); | |
764 } | |
765 | |
766 void os::print_date_and_time(outputStream *st) { | |
767 time_t tloc; | |
768 (void)time(&tloc); | |
769 st->print("time: %s", ctime(&tloc)); // ctime adds newline. | |
770 | |
771 double t = os::elapsedTime(); | |
772 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in | |
773 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int | |
774 // before printf. We lost some precision, but who cares? | |
775 st->print_cr("elapsed time: %d seconds", (int)t); | |
776 } | |
777 | |
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778 // moved from debug.cpp (used to be find()) but still called from there |
1907 | 779 // The verbose parameter is only set by the debug code in one case |
780 void os::print_location(outputStream* st, intptr_t x, bool verbose) { | |
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781 address addr = (address)x; |
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782 CodeBlob* b = CodeCache::find_blob_unsafe(addr); |
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783 if (b != NULL) { |
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784 if (b->is_buffer_blob()) { |
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785 // the interpreter is generated into a buffer blob |
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786 InterpreterCodelet* i = Interpreter::codelet_containing(addr); |
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787 if (i != NULL) { |
1907 | 788 st->print_cr(INTPTR_FORMAT " is an Interpreter codelet", addr); |
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789 i->print_on(st); |
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790 return; |
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791 } |
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792 if (Interpreter::contains(addr)) { |
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793 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code" |
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794 " (not bytecode specific)", addr); |
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795 return; |
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796 } |
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797 // |
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798 if (AdapterHandlerLibrary::contains(b)) { |
1907 | 799 st->print_cr(INTPTR_FORMAT " is an AdapterHandler", addr); |
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800 AdapterHandlerLibrary::print_handler_on(st, b); |
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801 } |
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802 // the stubroutines are generated into a buffer blob |
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803 StubCodeDesc* d = StubCodeDesc::desc_for(addr); |
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804 if (d != NULL) { |
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805 d->print_on(st); |
1907 | 806 if (verbose) st->cr(); |
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807 return; |
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808 } |
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809 if (StubRoutines::contains(addr)) { |
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810 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) " |
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811 "stub routine", addr); |
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812 return; |
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813 } |
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814 // the InlineCacheBuffer is using stubs generated into a buffer blob |
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815 if (InlineCacheBuffer::contains(addr)) { |
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816 st->print_cr(INTPTR_FORMAT " is pointing into InlineCacheBuffer", addr); |
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817 return; |
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818 } |
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819 VtableStub* v = VtableStubs::stub_containing(addr); |
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820 if (v != NULL) { |
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821 v->print_on(st); |
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822 return; |
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823 } |
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824 } |
1907 | 825 if (verbose && b->is_nmethod()) { |
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826 ResourceMark rm; |
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827 st->print("%#p: Compiled ", addr); |
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828 ((nmethod*)b)->method()->print_value_on(st); |
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829 st->print(" = (CodeBlob*)" INTPTR_FORMAT, b); |
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830 st->cr(); |
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831 return; |
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832 } |
1907 | 833 st->print(INTPTR_FORMAT " ", b); |
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834 if ( b->is_nmethod()) { |
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835 if (b->is_zombie()) { |
1907 | 836 st->print_cr("is zombie nmethod"); |
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837 } else if (b->is_not_entrant()) { |
1907 | 838 st->print_cr("is non-entrant nmethod"); |
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839 } |
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840 } |
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841 b->print_on(st); |
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842 return; |
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843 } |
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844 |
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845 if (Universe::heap()->is_in(addr)) { |
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846 HeapWord* p = Universe::heap()->block_start(addr); |
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847 bool print = false; |
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848 // If we couldn't find it it just may mean that heap wasn't parseable |
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849 // See if we were just given an oop directly |
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850 if (p != NULL && Universe::heap()->block_is_obj(p)) { |
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851 print = true; |
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852 } else if (p == NULL && ((oopDesc*)addr)->is_oop()) { |
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853 p = (HeapWord*) addr; |
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854 print = true; |
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855 } |
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856 if (print) { |
1907 | 857 st->print_cr(INTPTR_FORMAT " is an oop", addr); |
1681
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858 oop(p)->print_on(st); |
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859 if (p != (HeapWord*)x && oop(p)->is_constMethod() && |
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860 constMethodOop(p)->contains(addr)) { |
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861 Thread *thread = Thread::current(); |
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862 HandleMark hm(thread); |
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863 methodHandle mh (thread, constMethodOop(p)->method()); |
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864 if (!mh->is_native()) { |
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865 st->print_cr("bci_from(%p) = %d; print_codes():", |
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866 addr, mh->bci_from(address(x))); |
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867 mh->print_codes_on(st); |
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868 } |
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|
869 } |
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870 return; |
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871 } |
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872 } else { |
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873 if (Universe::heap()->is_in_reserved(addr)) { |
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874 st->print_cr(INTPTR_FORMAT " is an unallocated location " |
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875 "in the heap", addr); |
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876 return; |
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|
877 } |
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|
878 } |
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879 if (JNIHandles::is_global_handle((jobject) addr)) { |
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880 st->print_cr(INTPTR_FORMAT " is a global jni handle", addr); |
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881 return; |
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882 } |
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883 if (JNIHandles::is_weak_global_handle((jobject) addr)) { |
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884 st->print_cr(INTPTR_FORMAT " is a weak global jni handle", addr); |
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885 return; |
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|
886 } |
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887 #ifndef PRODUCT |
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888 // we don't keep the block list in product mode |
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889 if (JNIHandleBlock::any_contains((jobject) addr)) { |
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890 st->print_cr(INTPTR_FORMAT " is a local jni handle", addr); |
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891 return; |
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|
892 } |
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|
893 #endif |
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|
894 |
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895 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { |
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896 // Check for privilege stack |
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897 if (thread->privileged_stack_top() != NULL && |
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898 thread->privileged_stack_top()->contains(addr)) { |
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|
899 st->print_cr(INTPTR_FORMAT " is pointing into the privilege stack " |
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900 "for thread: " INTPTR_FORMAT, addr, thread); |
1907 | 901 if (verbose) thread->print_on(st); |
1681
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902 return; |
126ea7725993
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|
903 } |
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|
904 // If the addr is a java thread print information about that. |
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905 if (addr == (address)thread) { |
1907 | 906 if (verbose) { |
907 thread->print_on(st); | |
908 } else { | |
909 st->print_cr(INTPTR_FORMAT " is a thread", addr); | |
910 } | |
1681
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911 return; |
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|
912 } |
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913 // If the addr is in the stack region for this thread then report that |
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914 // and print thread info |
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915 if (thread->stack_base() >= addr && |
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916 addr > (thread->stack_base() - thread->stack_size())) { |
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917 st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " |
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918 INTPTR_FORMAT, addr, thread); |
1907 | 919 if (verbose) thread->print_on(st); |
1681
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920 return; |
126ea7725993
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|
921 } |
126ea7725993
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922 |
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923 } |
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|
924 // Try an OS specific find |
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925 if (os::find(addr, st)) { |
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|
926 return; |
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|
927 } |
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928 |
1907 | 929 st->print_cr(INTPTR_FORMAT " is an unknown value", addr); |
1681
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930 } |
0 | 931 |
932 // Looks like all platforms except IA64 can use the same function to check | |
933 // if C stack is walkable beyond current frame. The check for fp() is not | |
934 // necessary on Sparc, but it's harmless. | |
935 bool os::is_first_C_frame(frame* fr) { | |
936 #ifdef IA64 | |
937 // In order to walk native frames on Itanium, we need to access the unwind | |
938 // table, which is inside ELF. We don't want to parse ELF after fatal error, | |
939 // so return true for IA64. If we need to support C stack walking on IA64, | |
940 // this function needs to be moved to CPU specific files, as fp() on IA64 | |
941 // is register stack, which grows towards higher memory address. | |
942 return true; | |
943 #endif | |
944 | |
945 // Load up sp, fp, sender sp and sender fp, check for reasonable values. | |
946 // Check usp first, because if that's bad the other accessors may fault | |
947 // on some architectures. Ditto ufp second, etc. | |
948 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); | |
949 // sp on amd can be 32 bit aligned. | |
950 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); | |
951 | |
952 uintptr_t usp = (uintptr_t)fr->sp(); | |
953 if ((usp & sp_align_mask) != 0) return true; | |
954 | |
955 uintptr_t ufp = (uintptr_t)fr->fp(); | |
956 if ((ufp & fp_align_mask) != 0) return true; | |
957 | |
958 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); | |
959 if ((old_sp & sp_align_mask) != 0) return true; | |
960 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; | |
961 | |
962 uintptr_t old_fp = (uintptr_t)fr->link(); | |
963 if ((old_fp & fp_align_mask) != 0) return true; | |
964 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; | |
965 | |
966 // stack grows downwards; if old_fp is below current fp or if the stack | |
967 // frame is too large, either the stack is corrupted or fp is not saved | |
968 // on stack (i.e. on x86, ebp may be used as general register). The stack | |
969 // is not walkable beyond current frame. | |
970 if (old_fp < ufp) return true; | |
971 if (old_fp - ufp > 64 * K) return true; | |
972 | |
973 return false; | |
974 } | |
975 | |
976 #ifdef ASSERT | |
977 extern "C" void test_random() { | |
978 const double m = 2147483647; | |
979 double mean = 0.0, variance = 0.0, t; | |
980 long reps = 10000; | |
981 unsigned long seed = 1; | |
982 | |
983 tty->print_cr("seed %ld for %ld repeats...", seed, reps); | |
984 os::init_random(seed); | |
985 long num; | |
986 for (int k = 0; k < reps; k++) { | |
987 num = os::random(); | |
988 double u = (double)num / m; | |
989 assert(u >= 0.0 && u <= 1.0, "bad random number!"); | |
990 | |
991 // calculate mean and variance of the random sequence | |
992 mean += u; | |
993 variance += (u*u); | |
994 } | |
995 mean /= reps; | |
996 variance /= (reps - 1); | |
997 | |
998 assert(num == 1043618065, "bad seed"); | |
999 tty->print_cr("mean of the 1st 10000 numbers: %f", mean); | |
1000 tty->print_cr("variance of the 1st 10000 numbers: %f", variance); | |
1001 const double eps = 0.0001; | |
1002 t = fabsd(mean - 0.5018); | |
1003 assert(t < eps, "bad mean"); | |
1004 t = (variance - 0.3355) < 0.0 ? -(variance - 0.3355) : variance - 0.3355; | |
1005 assert(t < eps, "bad variance"); | |
1006 } | |
1007 #endif | |
1008 | |
1009 | |
1010 // Set up the boot classpath. | |
1011 | |
1012 char* os::format_boot_path(const char* format_string, | |
1013 const char* home, | |
1014 int home_len, | |
1015 char fileSep, | |
1016 char pathSep) { | |
1017 assert((fileSep == '/' && pathSep == ':') || | |
1018 (fileSep == '\\' && pathSep == ';'), "unexpected seperator chars"); | |
1019 | |
1020 // Scan the format string to determine the length of the actual | |
1021 // boot classpath, and handle platform dependencies as well. | |
1022 int formatted_path_len = 0; | |
1023 const char* p; | |
1024 for (p = format_string; *p != 0; ++p) { | |
1025 if (*p == '%') formatted_path_len += home_len - 1; | |
1026 ++formatted_path_len; | |
1027 } | |
1028 | |
1029 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1); | |
1030 if (formatted_path == NULL) { | |
1031 return NULL; | |
1032 } | |
1033 | |
1034 // Create boot classpath from format, substituting separator chars and | |
1035 // java home directory. | |
1036 char* q = formatted_path; | |
1037 for (p = format_string; *p != 0; ++p) { | |
1038 switch (*p) { | |
1039 case '%': | |
1040 strcpy(q, home); | |
1041 q += home_len; | |
1042 break; | |
1043 case '/': | |
1044 *q++ = fileSep; | |
1045 break; | |
1046 case ':': | |
1047 *q++ = pathSep; | |
1048 break; | |
1049 default: | |
1050 *q++ = *p; | |
1051 } | |
1052 } | |
1053 *q = '\0'; | |
1054 | |
1055 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); | |
1056 return formatted_path; | |
1057 } | |
1058 | |
1059 | |
1060 bool os::set_boot_path(char fileSep, char pathSep) { | |
1061 const char* home = Arguments::get_java_home(); | |
1062 int home_len = (int)strlen(home); | |
1063 | |
1064 static const char* meta_index_dir_format = "%/lib/"; | |
1065 static const char* meta_index_format = "%/lib/meta-index"; | |
1066 char* meta_index = format_boot_path(meta_index_format, home, home_len, fileSep, pathSep); | |
1067 if (meta_index == NULL) return false; | |
1068 char* meta_index_dir = format_boot_path(meta_index_dir_format, home, home_len, fileSep, pathSep); | |
1069 if (meta_index_dir == NULL) return false; | |
1070 Arguments::set_meta_index_path(meta_index, meta_index_dir); | |
1071 | |
1072 // Any modification to the JAR-file list, for the boot classpath must be | |
1073 // aligned with install/install/make/common/Pack.gmk. Note: boot class | |
1074 // path class JARs, are stripped for StackMapTable to reduce download size. | |
1075 static const char classpath_format[] = | |
1076 "%/lib/resources.jar:" | |
1077 "%/lib/rt.jar:" | |
1078 "%/lib/sunrsasign.jar:" | |
1079 "%/lib/jsse.jar:" | |
1080 "%/lib/jce.jar:" | |
1081 "%/lib/charsets.jar:" | |
1082 "%/classes"; | |
1083 char* sysclasspath = format_boot_path(classpath_format, home, home_len, fileSep, pathSep); | |
1084 if (sysclasspath == NULL) return false; | |
1085 Arguments::set_sysclasspath(sysclasspath); | |
1086 | |
1087 return true; | |
1088 } | |
1089 | |
691 | 1090 /* |
1091 * Splits a path, based on its separator, the number of | |
1092 * elements is returned back in n. | |
1093 * It is the callers responsibility to: | |
1094 * a> check the value of n, and n may be 0. | |
1095 * b> ignore any empty path elements | |
1096 * c> free up the data. | |
1097 */ | |
1098 char** os::split_path(const char* path, int* n) { | |
1099 *n = 0; | |
1100 if (path == NULL || strlen(path) == 0) { | |
1101 return NULL; | |
1102 } | |
1103 const char psepchar = *os::path_separator(); | |
1104 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1); | |
1105 if (inpath == NULL) { | |
1106 return NULL; | |
1107 } | |
1108 strncpy(inpath, path, strlen(path)); | |
1109 int count = 1; | |
1110 char* p = strchr(inpath, psepchar); | |
1111 // Get a count of elements to allocate memory | |
1112 while (p != NULL) { | |
1113 count++; | |
1114 p++; | |
1115 p = strchr(p, psepchar); | |
1116 } | |
1117 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count); | |
1118 if (opath == NULL) { | |
1119 return NULL; | |
1120 } | |
1121 | |
1122 // do the actual splitting | |
1123 p = inpath; | |
1124 for (int i = 0 ; i < count ; i++) { | |
1125 size_t len = strcspn(p, os::path_separator()); | |
1126 if (len > JVM_MAXPATHLEN) { | |
1127 return NULL; | |
1128 } | |
1129 // allocate the string and add terminator storage | |
1130 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1); | |
1131 if (s == NULL) { | |
1132 return NULL; | |
1133 } | |
1134 strncpy(s, p, len); | |
1135 s[len] = '\0'; | |
1136 opath[i] = s; | |
1137 p += len + 1; | |
1138 } | |
1139 FREE_C_HEAP_ARRAY(char, inpath); | |
1140 *n = count; | |
1141 return opath; | |
1142 } | |
1143 | |
0 | 1144 void os::set_memory_serialize_page(address page) { |
1145 int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); | |
1146 _mem_serialize_page = (volatile int32_t *)page; | |
1147 // We initialize the serialization page shift count here | |
1148 // We assume a cache line size of 64 bytes | |
1149 assert(SerializePageShiftCount == count, | |
1150 "thread size changed, fix SerializePageShiftCount constant"); | |
1151 set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t))); | |
1152 } | |
1153 | |
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1154 static volatile intptr_t SerializePageLock = 0; |
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1155 |
0 | 1156 // This method is called from signal handler when SIGSEGV occurs while the current |
1157 // thread tries to store to the "read-only" memory serialize page during state | |
1158 // transition. | |
1159 void os::block_on_serialize_page_trap() { | |
1160 if (TraceSafepoint) { | |
1161 tty->print_cr("Block until the serialize page permission restored"); | |
1162 } | |
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1163 // When VMThread is holding the SerializePageLock during modifying the |
0 | 1164 // access permission of the memory serialize page, the following call |
1165 // will block until the permission of that page is restored to rw. | |
1166 // Generally, it is unsafe to manipulate locks in signal handlers, but in | |
1167 // this case, it's OK as the signal is synchronous and we know precisely when | |
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1168 // it can occur. |
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1169 Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page"); |
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1170 Thread::muxRelease(&SerializePageLock); |
0 | 1171 } |
1172 | |
1173 // Serialize all thread state variables | |
1174 void os::serialize_thread_states() { | |
1175 // On some platforms such as Solaris & Linux, the time duration of the page | |
1176 // permission restoration is observed to be much longer than expected due to | |
1177 // scheduler starvation problem etc. To avoid the long synchronization | |
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1178 // time and expensive page trap spinning, 'SerializePageLock' is used to block |
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1179 // the mutator thread if such case is encountered. See bug 6546278 for details. |
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1180 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); |
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1181 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1182 os::vm_page_size(), MEM_PROT_READ); |
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1183 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1184 os::vm_page_size(), MEM_PROT_RW); |
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1185 Thread::muxRelease(&SerializePageLock); |
0 | 1186 } |
1187 | |
1188 // Returns true if the current stack pointer is above the stack shadow | |
1189 // pages, false otherwise. | |
1190 | |
1191 bool os::stack_shadow_pages_available(Thread *thread, methodHandle method) { | |
1192 assert(StackRedPages > 0 && StackYellowPages > 0,"Sanity check"); | |
1193 address sp = current_stack_pointer(); | |
1194 // Check if we have StackShadowPages above the yellow zone. This parameter | |
605 | 1195 // is dependent on the depth of the maximum VM call stack possible from |
0 | 1196 // the handler for stack overflow. 'instanceof' in the stack overflow |
1197 // handler or a println uses at least 8k stack of VM and native code | |
1198 // respectively. | |
1199 const int framesize_in_bytes = | |
1200 Interpreter::size_top_interpreter_activation(method()) * wordSize; | |
1201 int reserved_area = ((StackShadowPages + StackRedPages + StackYellowPages) | |
1202 * vm_page_size()) + framesize_in_bytes; | |
1203 // The very lower end of the stack | |
1204 address stack_limit = thread->stack_base() - thread->stack_size(); | |
1205 return (sp > (stack_limit + reserved_area)); | |
1206 } | |
1207 | |
1208 size_t os::page_size_for_region(size_t region_min_size, size_t region_max_size, | |
1209 uint min_pages) | |
1210 { | |
1211 assert(min_pages > 0, "sanity"); | |
1212 if (UseLargePages) { | |
1213 const size_t max_page_size = region_max_size / min_pages; | |
1214 | |
1215 for (unsigned int i = 0; _page_sizes[i] != 0; ++i) { | |
1216 const size_t sz = _page_sizes[i]; | |
1217 const size_t mask = sz - 1; | |
1218 if ((region_min_size & mask) == 0 && (region_max_size & mask) == 0) { | |
1219 // The largest page size with no fragmentation. | |
1220 return sz; | |
1221 } | |
1222 | |
1223 if (sz <= max_page_size) { | |
1224 // The largest page size that satisfies the min_pages requirement. | |
1225 return sz; | |
1226 } | |
1227 } | |
1228 } | |
1229 | |
1230 return vm_page_size(); | |
1231 } | |
1232 | |
1233 #ifndef PRODUCT | |
1234 void os::trace_page_sizes(const char* str, const size_t region_min_size, | |
1235 const size_t region_max_size, const size_t page_size, | |
1236 const char* base, const size_t size) | |
1237 { | |
1238 if (TracePageSizes) { | |
1239 tty->print_cr("%s: min=" SIZE_FORMAT " max=" SIZE_FORMAT | |
1240 " pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT | |
1241 " size=" SIZE_FORMAT, | |
1242 str, region_min_size, region_max_size, | |
1243 page_size, base, size); | |
1244 } | |
1245 } | |
1246 #endif // #ifndef PRODUCT | |
1247 | |
1248 // This is the working definition of a server class machine: | |
1249 // >= 2 physical CPU's and >=2GB of memory, with some fuzz | |
1250 // because the graphics memory (?) sometimes masks physical memory. | |
1251 // If you want to change the definition of a server class machine | |
1252 // on some OS or platform, e.g., >=4GB on Windohs platforms, | |
1253 // then you'll have to parameterize this method based on that state, | |
1254 // as was done for logical processors here, or replicate and | |
1255 // specialize this method for each platform. (Or fix os to have | |
1256 // some inheritance structure and use subclassing. Sigh.) | |
1257 // If you want some platform to always or never behave as a server | |
1258 // class machine, change the setting of AlwaysActAsServerClassMachine | |
1259 // and NeverActAsServerClassMachine in globals*.hpp. | |
1260 bool os::is_server_class_machine() { | |
1261 // First check for the early returns | |
1262 if (NeverActAsServerClassMachine) { | |
1263 return false; | |
1264 } | |
1265 if (AlwaysActAsServerClassMachine) { | |
1266 return true; | |
1267 } | |
1268 // Then actually look at the machine | |
1269 bool result = false; | |
1270 const unsigned int server_processors = 2; | |
1271 const julong server_memory = 2UL * G; | |
1272 // We seem not to get our full complement of memory. | |
1273 // We allow some part (1/8?) of the memory to be "missing", | |
1274 // based on the sizes of DIMMs, and maybe graphics cards. | |
1275 const julong missing_memory = 256UL * M; | |
1276 | |
1277 /* Is this a server class machine? */ | |
1278 if ((os::active_processor_count() >= (int)server_processors) && | |
1279 (os::physical_memory() >= (server_memory - missing_memory))) { | |
1280 const unsigned int logical_processors = | |
1281 VM_Version::logical_processors_per_package(); | |
1282 if (logical_processors > 1) { | |
1283 const unsigned int physical_packages = | |
1284 os::active_processor_count() / logical_processors; | |
1285 if (physical_packages > server_processors) { | |
1286 result = true; | |
1287 } | |
1288 } else { | |
1289 result = true; | |
1290 } | |
1291 } | |
1292 return result; | |
1293 } | |
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1294 |
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1295 // Read file line by line, if line is longer than bsize, |
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1296 // skip rest of line. |
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1297 int os::get_line_chars(int fd, char* buf, const size_t bsize){ |
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1298 size_t sz, i = 0; |
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1299 |
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1300 // read until EOF, EOL or buf is full |
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1301 while ((sz = (int) read(fd, &buf[i], 1)) == 1 && i < (bsize-1) && buf[i] != '\n') { |
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1302 ++i; |
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1303 } |
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1304 |
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1305 if (buf[i] == '\n') { |
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1306 // EOL reached so ignore EOL character and return |
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1307 |
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1308 buf[i] = 0; |
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1309 return (int) i; |
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1310 } |
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1311 |
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1312 buf[i+1] = 0; |
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1313 |
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1314 if (sz != 1) { |
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1315 // EOF reached. if we read chars before EOF return them and |
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1316 // return EOF on next call otherwise return EOF |
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1317 |
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1318 return (i == 0) ? -1 : (int) i; |
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1319 } |
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1320 |
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1321 // line is longer than size of buf, skip to EOL |
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1322 int ch; |
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1323 while (read(fd, &ch, 1) == 1 && ch != '\n') { |
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1324 // Do nothing |
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1325 } |
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1326 |
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1327 // return initial part of line that fits in buf. |
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1328 // If we reached EOF, it will be returned on next call. |
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1329 |
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1330 return (int) i; |
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1331 } |