Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/services/attachListener.cpp

src/share/vm/services/attachListener.cpp

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1 /*
2 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "gc_implementation/shared/vmGCOperations.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "prims/jvmtiExport.hpp"
31 #include "runtime/arguments.hpp"
32 #include "runtime/globals.hpp"
33 #include "runtime/java.hpp"
34 #include "runtime/javaCalls.hpp"
35 #include "runtime/os.hpp"
36 #include "services/attachListener.hpp"
37 #include "services/diagnosticCommand.hpp"
38 #include "services/heapDumper.hpp"
39
40 volatile bool AttachListener::_initialized;
41
42 // Implementation of "properties" command.
43 //
44 // Invokes sun.misc.VMSupport.serializePropertiesToByteArray to serialize
45 // the system properties into a byte array.
46
47 static Klass* load_and_initialize_klass(Symbol* sh, TRAPS) {
48 Klass* k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL);
49 instanceKlassHandle ik (THREAD, k);
50 if (ik->should_be_initialized()) {
51 ik->initialize(CHECK_NULL);
52 }
53 return ik();
54 }
55
56 static jint get_properties(AttachOperation* op, outputStream* out, Symbol* serializePropertiesMethod) {
57 Thread* THREAD = Thread::current();
58 HandleMark hm;
59
60 // load sun.misc.VMSupport
61 Symbol* klass = vmSymbols::sun_misc_VMSupport();
62 Klass* k = load_and_initialize_klass(klass, THREAD);
63 if (HAS_PENDING_EXCEPTION) {
64 java_lang_Throwable::print(PENDING_EXCEPTION, out);
65 CLEAR_PENDING_EXCEPTION;
66 return JNI_ERR;
67 }
68 instanceKlassHandle ik(THREAD, k);
69
70 // invoke the serializePropertiesToByteArray method
71 JavaValue result(T_OBJECT);
72 JavaCallArguments args;
73
74
75 Symbol* signature = vmSymbols::serializePropertiesToByteArray_signature();
76 JavaCalls::call_static(&result,
77 ik,
78 serializePropertiesMethod,
79 signature,
80 &args,
81 THREAD);
82 if (HAS_PENDING_EXCEPTION) {
83 java_lang_Throwable::print(PENDING_EXCEPTION, out);
84 CLEAR_PENDING_EXCEPTION;
85 return JNI_ERR;
86 }
87
88 // The result should be a [B
89 oop res = (oop)result.get_jobject();
90 assert(res->is_typeArray(), "just checking");
91 assert(TypeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "just checking");
92
93 // copy the bytes to the output stream
94 typeArrayOop ba = typeArrayOop(res);
95 jbyte* addr = typeArrayOop(res)->byte_at_addr(0);
96 out->print_raw((const char*)addr, ba->length());
97
98 return JNI_OK;
99 }
100
101 // Implementation of "properties" command.
102 // See also: PrintSystemPropertiesDCmd class
103 static jint get_system_properties(AttachOperation* op, outputStream* out) {
104 return get_properties(op, out, vmSymbols::serializePropertiesToByteArray_name());
105 }
106
107 // Implementation of "agent_properties" command.
108 static jint get_agent_properties(AttachOperation* op, outputStream* out) {
109 return get_properties(op, out, vmSymbols::serializeAgentPropertiesToByteArray_name());
110 }
111
112 // Implementation of "datadump" command.
113 //
114 // Raises a SIGBREAK signal so that VM dump threads, does deadlock detection,
115 // etc. In theory this command should only post a DataDumpRequest to any
116 // JVMTI environment that has enabled this event. However it's useful to
117 // trigger the SIGBREAK handler.
118
119 static jint data_dump(AttachOperation* op, outputStream* out) {
120 if (!ReduceSignalUsage) {
121 AttachListener::pd_data_dump();
122 } else {
123 if (JvmtiExport::should_post_data_dump()) {
124 JvmtiExport::post_data_dump();
125 }
126 }
127 return JNI_OK;
128 }
129
130 // Implementation of "threaddump" command - essentially a remote ctrl-break
131 // See also: ThreadDumpDCmd class
132 //
133 static jint thread_dump(AttachOperation* op, outputStream* out) {
134 bool print_concurrent_locks = false;
135 if (op->arg(0) != NULL && strcmp(op->arg(0), "-l") == 0) {
136 print_concurrent_locks = true;
137 }
138
139 // thread stacks
140 VM_PrintThreads op1(out, print_concurrent_locks);
141 VMThread::execute(&op1);
142
143 // JNI global handles
144 VM_PrintJNI op2(out);
145 VMThread::execute(&op2);
146
147 // Deadlock detection
148 VM_FindDeadlocks op3(out);
149 VMThread::execute(&op3);
150
151 return JNI_OK;
152 }
153
154 // A jcmd attach operation request was received, which will now
155 // dispatch to the diagnostic commands used for serviceability functions.
156 static jint jcmd(AttachOperation* op, outputStream* out) {
157 Thread* THREAD = Thread::current();
158 // All the supplied jcmd arguments are stored as a single
159 // string (op->arg(0)). This is parsed by the Dcmd framework.
160 DCmd::parse_and_execute(DCmd_Source_AttachAPI, out, op->arg(0), ' ', THREAD);
161 if (HAS_PENDING_EXCEPTION) {
162 java_lang_Throwable::print(PENDING_EXCEPTION, out);
163 out->cr();
164 CLEAR_PENDING_EXCEPTION;
165 // The exception has been printed on the output stream
166 // If the JVM returns JNI_ERR, the attachAPI throws a generic I/O
167 // exception and the content of the output stream is not processed.
168 // By returning JNI_OK, the exception will be displayed on the client side
169 }
170 return JNI_OK;
171 }
172
173 // Implementation of "dumpheap" command.
174 // See also: HeapDumpDCmd class
175 //
176 // Input arguments :-
177 // arg0: Name of the dump file
178 // arg1: "-live" or "-all"
179 jint dump_heap(AttachOperation* op, outputStream* out) {
180 const char* path = op->arg(0);
181 if (path == NULL || path[0] == '\0') {
182 out->print_cr("No dump file specified");
183 } else {
184 bool live_objects_only = true; // default is true to retain the behavior before this change is made
185 const char* arg1 = op->arg(1);
186 if (arg1 != NULL && (strlen(arg1) > 0)) {
187 if (strcmp(arg1, "-all") != 0 && strcmp(arg1, "-live") != 0) {
188 out->print_cr("Invalid argument to dumpheap operation: %s", arg1);
189 return JNI_ERR;
190 }
191 live_objects_only = strcmp(arg1, "-live") == 0;
192 }
193
194 // Request a full GC before heap dump if live_objects_only = true
195 // This helps reduces the amount of unreachable objects in the dump
196 // and makes it easier to browse.
197 HeapDumper dumper(live_objects_only /* request GC */);
198 int res = dumper.dump(op->arg(0));
199 if (res == 0) {
200 out->print_cr("Heap dump file created");
201 } else {
202 // heap dump failed
203 ResourceMark rm;
204 char* error = dumper.error_as_C_string();
205 if (error == NULL) {
206 out->print_cr("Dump failed - reason unknown");
207 } else {
208 out->print_cr("%s", error);
209 }
210 }
211 }
212 return JNI_OK;
213 }
214
215 // Implementation of "inspectheap" command
216 // See also: ClassHistogramDCmd class
217 //
218 // Input arguments :-
219 // arg0: "-live" or "-all"
220 static jint heap_inspection(AttachOperation* op, outputStream* out) {
221 bool live_objects_only = true; // default is true to retain the behavior before this change is made
222 const char* arg0 = op->arg(0);
223 if (arg0 != NULL && (strlen(arg0) > 0)) {
224 if (strcmp(arg0, "-all") != 0 && strcmp(arg0, "-live") != 0) {
225 out->print_cr("Invalid argument to inspectheap operation: %s", arg0);
226 return JNI_ERR;
227 }
228 live_objects_only = strcmp(arg0, "-live") == 0;
229 }
230 VM_GC_HeapInspection heapop(out, live_objects_only /* request full gc */);
231 VMThread::execute(&heapop);
232 return JNI_OK;
233 }
234
235 // set a boolean global flag using value from AttachOperation
236 static jint set_bool_flag(const char* name, AttachOperation* op, outputStream* out) {
237 bool value = true;
238 const char* arg1;
239 if ((arg1 = op->arg(1)) != NULL) {
240 int tmp;
241 int n = sscanf(arg1, "%d", &tmp);
242 if (n != 1) {
243 out->print_cr("flag value must be a boolean (1 or 0)");
244 return JNI_ERR;
245 }
246 value = (tmp != 0);
247 }
248 bool res = CommandLineFlags::boolAtPut((char*)name, &value, Flag::ATTACH_ON_DEMAND);
249 if (! res) {
250 out->print_cr("setting flag %s failed", name);
251 }
252 return res? JNI_OK : JNI_ERR;
253 }
254
255 // set a intx global flag using value from AttachOperation
256 static jint set_intx_flag(const char* name, AttachOperation* op, outputStream* out) {
257 intx value;
258 const char* arg1;
259 if ((arg1 = op->arg(1)) != NULL) {
260 int n = sscanf(arg1, INTX_FORMAT, &value);
261 if (n != 1) {
262 out->print_cr("flag value must be an integer");
263 return JNI_ERR;
264 }
265 }
266 bool res = CommandLineFlags::intxAtPut((char*)name, &value, Flag::ATTACH_ON_DEMAND);
267 if (! res) {
268 out->print_cr("setting flag %s failed", name);
269 }
270
271 return res? JNI_OK : JNI_ERR;
272 }
273
274 // set a uintx global flag using value from AttachOperation
275 static jint set_uintx_flag(const char* name, AttachOperation* op, outputStream* out) {
276 uintx value;
277 const char* arg1;
278 if ((arg1 = op->arg(1)) != NULL) {
279 int n = sscanf(arg1, UINTX_FORMAT, &value);
280 if (n != 1) {
281 out->print_cr("flag value must be an unsigned integer");
282 return JNI_ERR;
283 }
284 }
285
286 if (strncmp(name, "MaxHeapFreeRatio", 17) == 0) {
287 FormatBuffer<80> err_msg("%s", "");
288 if (!Arguments::verify_MaxHeapFreeRatio(err_msg, value)) {
289 out->print_cr("%s", err_msg.buffer());
290 return JNI_ERR;
291 }
292 } else if (strncmp(name, "MinHeapFreeRatio", 17) == 0) {
293 FormatBuffer<80> err_msg("%s", "");
294 if (!Arguments::verify_MinHeapFreeRatio(err_msg, value)) {
295 out->print_cr("%s", err_msg.buffer());
296 return JNI_ERR;
297 }
298 }
299 bool res = CommandLineFlags::uintxAtPut((char*)name, &value, Flag::ATTACH_ON_DEMAND);
300 if (! res) {
301 out->print_cr("setting flag %s failed", name);
302 }
303
304 return res? JNI_OK : JNI_ERR;
305 }
306
307 // set a uint64_t global flag using value from AttachOperation
308 static jint set_uint64_t_flag(const char* name, AttachOperation* op, outputStream* out) {
309 uint64_t value;
310 const char* arg1;
311 if ((arg1 = op->arg(1)) != NULL) {
312 int n = sscanf(arg1, UINT64_FORMAT, &value);
313 if (n != 1) {
314 out->print_cr("flag value must be an unsigned 64-bit integer");
315 return JNI_ERR;
316 }
317 }
318 bool res = CommandLineFlags::uint64_tAtPut((char*)name, &value, Flag::ATTACH_ON_DEMAND);
319 if (! res) {
320 out->print_cr("setting flag %s failed", name);
321 }
322
323 return res? JNI_OK : JNI_ERR;
324 }
325
326 // set a string global flag using value from AttachOperation
327 static jint set_ccstr_flag(const char* name, AttachOperation* op, outputStream* out) {
328 const char* value;
329 if ((value = op->arg(1)) == NULL) {
330 out->print_cr("flag value must be a string");
331 return JNI_ERR;
332 }
333 bool res = CommandLineFlags::ccstrAtPut((char*)name, &value, Flag::ATTACH_ON_DEMAND);
334 if (res) {
335 FREE_C_HEAP_ARRAY(char, value, mtInternal);
336 } else {
337 out->print_cr("setting flag %s failed", name);
338 }
339
340 return res? JNI_OK : JNI_ERR;
341 }
342
343 // Implementation of "setflag" command
344 static jint set_flag(AttachOperation* op, outputStream* out) {
345
346 const char* name = NULL;
347 if ((name = op->arg(0)) == NULL) {
348 out->print_cr("flag name is missing");
349 return JNI_ERR;
350 }
351
352 Flag* f = Flag::find_flag((char*)name, strlen(name));
353 if (f && f->is_external() && f->is_writeable()) {
354 if (f->is_bool()) {
355 return set_bool_flag(name, op, out);
356 } else if (f->is_intx()) {
357 return set_intx_flag(name, op, out);
358 } else if (f->is_uintx()) {
359 return set_uintx_flag(name, op, out);
360 } else if (f->is_uint64_t()) {
361 return set_uint64_t_flag(name, op, out);
362 } else if (f->is_ccstr()) {
363 return set_ccstr_flag(name, op, out);
364 } else {
365 ShouldNotReachHere();
366 return JNI_ERR;
367 }
368 } else {
369 return AttachListener::pd_set_flag(op, out);
370 }
371 }
372
373 // Implementation of "printflag" command
374 // See also: PrintVMFlagsDCmd class
375 static jint print_flag(AttachOperation* op, outputStream* out) {
376 const char* name = NULL;
377 if ((name = op->arg(0)) == NULL) {
378 out->print_cr("flag name is missing");
379 return JNI_ERR;
380 }
381 Flag* f = Flag::find_flag((char*)name, strlen(name));
382 if (f) {
383 f->print_as_flag(out);
384 out->cr();
385 } else {
386 out->print_cr("no such flag '%s'", name);
387 }
388 return JNI_OK;
389 }
390
391 // Table to map operation names to functions.
392
393 // names must be of length <= AttachOperation::name_length_max
394 static AttachOperationFunctionInfo funcs[] = {
395 { "agentProperties", get_agent_properties },
396 { "datadump", data_dump },
397 { "dumpheap", dump_heap },
398 { "load", JvmtiExport::load_agent_library },
399 { "properties", get_system_properties },
400 { "threaddump", thread_dump },
401 { "inspectheap", heap_inspection },
402 { "setflag", set_flag },
403 { "printflag", print_flag },
404 { "jcmd", jcmd },
405 { NULL, NULL }
406 };
407
408
409
410 // The Attach Listener threads services a queue. It dequeues an operation
411 // from the queue, examines the operation name (command), and dispatches
412 // to the corresponding function to perform the operation.
413
414 static void attach_listener_thread_entry(JavaThread* thread, TRAPS) {
415 os::set_priority(thread, NearMaxPriority);
416
417 thread->record_stack_base_and_size();
418
419 if (AttachListener::pd_init() != 0) {
420 return;
421 }
422 AttachListener::set_initialized();
423
424 for (;;) {
425 AttachOperation* op = AttachListener::dequeue();
426 if (op == NULL) {
427 return; // dequeue failed or shutdown
428 }
429
430 ResourceMark rm;
431 bufferedStream st;
432 jint res = JNI_OK;
433
434 // handle special detachall operation
435 if (strcmp(op->name(), AttachOperation::detachall_operation_name()) == 0) {
436 AttachListener::detachall();
437 } else {
438 // find the function to dispatch too
439 AttachOperationFunctionInfo* info = NULL;
440 for (int i=0; funcs[i].name != NULL; i++) {
441 const char* name = funcs[i].name;
442 assert(strlen(name) <= AttachOperation::name_length_max, "operation <= name_length_max");
443 if (strcmp(op->name(), name) == 0) {
444 info = &(funcs[i]);
445 break;
446 }
447 }
448
449 // check for platform dependent attach operation
450 if (info == NULL) {
451 info = AttachListener::pd_find_operation(op->name());
452 }
453
454 if (info != NULL) {
455 // dispatch to the function that implements this operation
456 res = (info->func)(op, &st);
457 } else {
458 st.print("Operation %s not recognized!", op->name());
459 res = JNI_ERR;
460 }
461 }
462
463 // operation complete - send result and output to client
464 op->complete(res, &st);
465 }
466 }
467
468 // Starts the Attach Listener thread
469 void AttachListener::init() {
470 EXCEPTION_MARK;
471 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK);
472 instanceKlassHandle klass (THREAD, k);
473 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
474
475 const char thread_name[] = "Attach Listener";
476 Handle string = java_lang_String::create_from_str(thread_name, CHECK);
477
478 // Initialize thread_oop to put it into the system threadGroup
479 Handle thread_group (THREAD, Universe::system_thread_group());
480 JavaValue result(T_VOID);
481 JavaCalls::call_special(&result, thread_oop,
482 klass,
483 vmSymbols::object_initializer_name(),
484 vmSymbols::threadgroup_string_void_signature(),
485 thread_group,
486 string,
487 THREAD);
488
489 if (HAS_PENDING_EXCEPTION) {
490 tty->print_cr("Exception in VM (AttachListener::init) : ");
491 java_lang_Throwable::print(PENDING_EXCEPTION, tty);
492 tty->cr();
493
494 CLEAR_PENDING_EXCEPTION;
495
496 return;
497 }
498
499 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass());
500 JavaCalls::call_special(&result,
501 thread_group,
502 group,
503 vmSymbols::add_method_name(),
504 vmSymbols::thread_void_signature(),
505 thread_oop, // ARG 1
506 THREAD);
507
508 if (HAS_PENDING_EXCEPTION) {
509 tty->print_cr("Exception in VM (AttachListener::init) : ");
510 java_lang_Throwable::print(PENDING_EXCEPTION, tty);
511 tty->cr();
512
513 CLEAR_PENDING_EXCEPTION;
514
515 return;
516 }
517
518 { MutexLocker mu(Threads_lock);
519 JavaThread* listener_thread = new JavaThread(&attach_listener_thread_entry);
520
521 // Check that thread and osthread were created
522 if (listener_thread == NULL || listener_thread->osthread() == NULL) {
523 vm_exit_during_initialization("java.lang.OutOfMemoryError",
524 "unable to create new native thread");
525 }
526
527 java_lang_Thread::set_thread(thread_oop(), listener_thread);
528 java_lang_Thread::set_daemon(thread_oop());
529
530 listener_thread->set_threadObj(thread_oop());
531 Threads::add(listener_thread);
532 Thread::start(listener_thread);
533 }
534 }
535
536 // Performs clean-up tasks on platforms where we can detect that the last
537 // client has detached
538 void AttachListener::detachall() {
539 // call the platform dependent clean-up
540 pd_detachall();
541 }

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