Mercurial > hg > truffle
annotate src/share/vm/services/attachListener.cpp @ 4832:a8a126788ea0
7078465: G1: Don't use the undefined value (-1) for the G1 old memory pool max size
Reviewed-by: johnc, brutisso
author | tonyp |
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date | Thu, 19 Jan 2012 09:13:58 -0500 |
parents | 4f25538b54c9 |
children | d2a62e0f25eb |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 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 * | |
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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/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" | |
4133 | 37 #include "services/diagnosticCommand.hpp" |
1972 | 38 #include "services/heapDumper.hpp" |
0 | 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 | |
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47 static klassOop load_and_initialize_klass(Symbol* sh, TRAPS) { |
0 | 48 klassOop 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 | |
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56 static jint get_properties(AttachOperation* op, outputStream* out, Symbol* serializePropertiesMethod) { |
0 | 57 Thread* THREAD = Thread::current(); |
58 HandleMark hm; | |
59 | |
60 // load sun.misc.VMSupport | |
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61 Symbol* klass = vmSymbols::sun_misc_VMSupport(); |
0 | 62 klassOop 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 | |
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75 Symbol* signature = vmSymbols::serializePropertiesToByteArray_signature(); |
0 | 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. | |
4773 | 102 // See also: PrintSystemPropertiesDCmd class |
0 | 103 static jint get_system_properties(AttachOperation* op, outputStream* out) { |
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104 return get_properties(op, out, vmSymbols::serializePropertiesToByteArray_name()); |
0 | 105 } |
106 | |
107 // Implementation of "agent_properties" command. | |
108 static jint get_agent_properties(AttachOperation* op, outputStream* out) { | |
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109 return get_properties(op, out, vmSymbols::serializeAgentPropertiesToByteArray_name()); |
0 | 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 | |
4773 | 131 // See also: ThreadDumpDCmd class |
0 | 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 | |
4133 | 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(out, op->arg(0), ' ', THREAD); | |
161 if (HAS_PENDING_EXCEPTION) { | |
162 java_lang_Throwable::print(PENDING_EXCEPTION, out); | |
4773 | 163 out->cr(); |
4133 | 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 | |
0 | 173 #ifndef SERVICES_KERNEL // Heap dumping not supported |
174 // Implementation of "dumpheap" command. | |
4773 | 175 // See also: HeapDumpDCmd class |
0 | 176 // |
177 // Input arguments :- | |
178 // arg0: Name of the dump file | |
179 // arg1: "-live" or "-all" | |
180 jint dump_heap(AttachOperation* op, outputStream* out) { | |
181 const char* path = op->arg(0); | |
182 if (path == NULL || path[0] == '\0') { | |
183 out->print_cr("No dump file specified"); | |
184 } else { | |
185 bool live_objects_only = true; // default is true to retain the behavior before this change is made | |
186 const char* arg1 = op->arg(1); | |
187 if (arg1 != NULL && (strlen(arg1) > 0)) { | |
188 if (strcmp(arg1, "-all") != 0 && strcmp(arg1, "-live") != 0) { | |
189 out->print_cr("Invalid argument to dumpheap operation: %s", arg1); | |
190 return JNI_ERR; | |
191 } | |
192 live_objects_only = strcmp(arg1, "-live") == 0; | |
193 } | |
194 | |
195 // Request a full GC before heap dump if live_objects_only = true | |
196 // This helps reduces the amount of unreachable objects in the dump | |
197 // and makes it easier to browse. | |
198 HeapDumper dumper(live_objects_only /* request GC */); | |
199 int res = dumper.dump(op->arg(0)); | |
200 if (res == 0) { | |
201 out->print_cr("Heap dump file created"); | |
202 } else { | |
203 // heap dump failed | |
204 ResourceMark rm; | |
205 char* error = dumper.error_as_C_string(); | |
206 if (error == NULL) { | |
207 out->print_cr("Dump failed - reason unknown"); | |
208 } else { | |
209 out->print_cr("%s", error); | |
210 } | |
211 } | |
212 } | |
213 return JNI_OK; | |
214 } | |
215 #endif // SERVICES_KERNEL | |
216 | |
217 // Implementation of "inspectheap" command | |
4773 | 218 // See also: ClassHistogramDCmd class |
0 | 219 // |
220 // Input arguments :- | |
221 // arg0: "-live" or "-all" | |
222 static jint heap_inspection(AttachOperation* op, outputStream* out) { | |
223 bool live_objects_only = true; // default is true to retain the behavior before this change is made | |
224 const char* arg0 = op->arg(0); | |
225 if (arg0 != NULL && (strlen(arg0) > 0)) { | |
226 if (strcmp(arg0, "-all") != 0 && strcmp(arg0, "-live") != 0) { | |
227 out->print_cr("Invalid argument to inspectheap operation: %s", arg0); | |
228 return JNI_ERR; | |
229 } | |
230 live_objects_only = strcmp(arg0, "-live") == 0; | |
231 } | |
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232 VM_GC_HeapInspection heapop(out, live_objects_only /* request full gc */, true /* need_prologue */); |
0 | 233 VMThread::execute(&heapop); |
234 return JNI_OK; | |
235 } | |
236 | |
237 // set a boolean global flag using value from AttachOperation | |
238 static jint set_bool_flag(const char* name, AttachOperation* op, outputStream* out) { | |
239 bool value = true; | |
240 const char* arg1; | |
241 if ((arg1 = op->arg(1)) != NULL) { | |
242 int tmp; | |
243 int n = sscanf(arg1, "%d", &tmp); | |
244 if (n != 1) { | |
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245 out->print_cr("flag value must be a boolean (1 or 0)"); |
0 | 246 return JNI_ERR; |
247 } | |
248 value = (tmp != 0); | |
249 } | |
250 bool res = CommandLineFlags::boolAtPut((char*)name, &value, ATTACH_ON_DEMAND); | |
251 if (! res) { | |
252 out->print_cr("setting flag %s failed", name); | |
253 } | |
254 return res? JNI_OK : JNI_ERR; | |
255 } | |
256 | |
257 // set a intx global flag using value from AttachOperation | |
258 static jint set_intx_flag(const char* name, AttachOperation* op, outputStream* out) { | |
259 intx value; | |
260 const char* arg1; | |
261 if ((arg1 = op->arg(1)) != NULL) { | |
262 int n = sscanf(arg1, INTX_FORMAT, &value); | |
263 if (n != 1) { | |
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264 out->print_cr("flag value must be an integer"); |
0 | 265 return JNI_ERR; |
266 } | |
267 } | |
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268 bool res = CommandLineFlags::intxAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
0 | 269 if (! res) { |
270 out->print_cr("setting flag %s failed", name); | |
271 } | |
272 | |
273 return res? JNI_OK : JNI_ERR; | |
274 } | |
275 | |
276 // set a uintx global flag using value from AttachOperation | |
277 static jint set_uintx_flag(const char* name, AttachOperation* op, outputStream* out) { | |
278 uintx value; | |
279 const char* arg1; | |
280 if ((arg1 = op->arg(1)) != NULL) { | |
281 int n = sscanf(arg1, UINTX_FORMAT, &value); | |
282 if (n != 1) { | |
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283 out->print_cr("flag value must be an unsigned integer"); |
0 | 284 return JNI_ERR; |
285 } | |
286 } | |
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287 bool res = CommandLineFlags::uintxAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
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288 if (! res) { |
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289 out->print_cr("setting flag %s failed", name); |
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290 } |
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291 |
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292 return res? JNI_OK : JNI_ERR; |
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293 } |
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294 |
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295 // set a uint64_t global flag using value from AttachOperation |
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296 static jint set_uint64_t_flag(const char* name, AttachOperation* op, outputStream* out) { |
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297 uint64_t value; |
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298 const char* arg1; |
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299 if ((arg1 = op->arg(1)) != NULL) { |
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300 int n = sscanf(arg1, UINT64_FORMAT, &value); |
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301 if (n != 1) { |
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302 out->print_cr("flag value must be an unsigned 64-bit integer"); |
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303 return JNI_ERR; |
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304 } |
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305 } |
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306 bool res = CommandLineFlags::uint64_tAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
0 | 307 if (! res) { |
308 out->print_cr("setting flag %s failed", name); | |
309 } | |
310 | |
311 return res? JNI_OK : JNI_ERR; | |
312 } | |
313 | |
314 // set a string global flag using value from AttachOperation | |
315 static jint set_ccstr_flag(const char* name, AttachOperation* op, outputStream* out) { | |
316 const char* value; | |
317 if ((value = op->arg(1)) == NULL) { | |
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318 out->print_cr("flag value must be a string"); |
0 | 319 return JNI_ERR; |
320 } | |
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321 bool res = CommandLineFlags::ccstrAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
0 | 322 if (res) { |
323 FREE_C_HEAP_ARRAY(char, value); | |
324 } else { | |
325 out->print_cr("setting flag %s failed", name); | |
326 } | |
327 | |
328 return res? JNI_OK : JNI_ERR; | |
329 } | |
330 | |
331 // Implementation of "setflag" command | |
332 static jint set_flag(AttachOperation* op, outputStream* out) { | |
333 | |
334 const char* name = NULL; | |
335 if ((name = op->arg(0)) == NULL) { | |
336 out->print_cr("flag name is missing"); | |
337 return JNI_ERR; | |
338 } | |
339 | |
340 Flag* f = Flag::find_flag((char*)name, strlen(name)); | |
341 if (f && f->is_external() && f->is_writeable()) { | |
342 if (f->is_bool()) { | |
343 return set_bool_flag(name, op, out); | |
344 } else if (f->is_intx()) { | |
345 return set_intx_flag(name, op, out); | |
346 } else if (f->is_uintx()) { | |
347 return set_uintx_flag(name, op, out); | |
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348 } else if (f->is_uint64_t()) { |
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349 return set_uint64_t_flag(name, op, out); |
0 | 350 } else if (f->is_ccstr()) { |
351 return set_ccstr_flag(name, op, out); | |
352 } else { | |
353 ShouldNotReachHere(); | |
354 return JNI_ERR; | |
355 } | |
356 } else { | |
357 return AttachListener::pd_set_flag(op, out); | |
358 } | |
359 } | |
360 | |
361 // Implementation of "printflag" command | |
4773 | 362 // See also: PrintVMFlagsDCmd class |
0 | 363 static jint print_flag(AttachOperation* op, outputStream* out) { |
364 const char* name = NULL; | |
365 if ((name = op->arg(0)) == NULL) { | |
366 out->print_cr("flag name is missing"); | |
367 return JNI_ERR; | |
368 } | |
369 Flag* f = Flag::find_flag((char*)name, strlen(name)); | |
370 if (f) { | |
371 f->print_as_flag(out); | |
372 out->print_cr(""); | |
373 } else { | |
374 out->print_cr("no such flag '%s'", name); | |
375 } | |
376 return JNI_OK; | |
377 } | |
378 | |
379 // Table to map operation names to functions. | |
380 | |
381 // names must be of length <= AttachOperation::name_length_max | |
382 static AttachOperationFunctionInfo funcs[] = { | |
383 { "agentProperties", get_agent_properties }, | |
384 { "datadump", data_dump }, | |
385 #ifndef SERVICES_KERNEL | |
386 { "dumpheap", dump_heap }, | |
387 #endif // SERVICES_KERNEL | |
388 { "load", JvmtiExport::load_agent_library }, | |
389 { "properties", get_system_properties }, | |
390 { "threaddump", thread_dump }, | |
391 { "inspectheap", heap_inspection }, | |
392 { "setflag", set_flag }, | |
393 { "printflag", print_flag }, | |
4133 | 394 { "jcmd", jcmd }, |
0 | 395 { NULL, NULL } |
396 }; | |
397 | |
398 | |
399 | |
400 // The Attach Listener threads services a queue. It dequeues an operation | |
401 // from the queue, examines the operation name (command), and dispatches | |
402 // to the corresponding function to perform the operation. | |
403 | |
404 static void attach_listener_thread_entry(JavaThread* thread, TRAPS) { | |
405 os::set_priority(thread, NearMaxPriority); | |
406 | |
407 if (AttachListener::pd_init() != 0) { | |
408 return; | |
409 } | |
410 AttachListener::set_initialized(); | |
411 | |
412 for (;;) { | |
413 AttachOperation* op = AttachListener::dequeue(); | |
414 if (op == NULL) { | |
415 return; // dequeue failed or shutdown | |
416 } | |
417 | |
418 ResourceMark rm; | |
419 bufferedStream st; | |
420 jint res = JNI_OK; | |
421 | |
422 // handle special detachall operation | |
423 if (strcmp(op->name(), AttachOperation::detachall_operation_name()) == 0) { | |
424 AttachListener::detachall(); | |
425 } else { | |
426 // find the function to dispatch too | |
427 AttachOperationFunctionInfo* info = NULL; | |
428 for (int i=0; funcs[i].name != NULL; i++) { | |
429 const char* name = funcs[i].name; | |
430 assert(strlen(name) <= AttachOperation::name_length_max, "operation <= name_length_max"); | |
431 if (strcmp(op->name(), name) == 0) { | |
432 info = &(funcs[i]); | |
433 break; | |
434 } | |
435 } | |
436 | |
437 // check for platform dependent attach operation | |
438 if (info == NULL) { | |
439 info = AttachListener::pd_find_operation(op->name()); | |
440 } | |
441 | |
442 if (info != NULL) { | |
443 // dispatch to the function that implements this operation | |
444 res = (info->func)(op, &st); | |
445 } else { | |
446 st.print("Operation %s not recognized!", op->name()); | |
447 res = JNI_ERR; | |
448 } | |
449 } | |
450 | |
451 // operation complete - send result and output to client | |
452 op->complete(res, &st); | |
453 } | |
454 } | |
455 | |
456 // Starts the Attach Listener thread | |
457 void AttachListener::init() { | |
458 EXCEPTION_MARK; | |
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459 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 460 instanceKlassHandle klass (THREAD, k); |
461 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
462 | |
463 const char thread_name[] = "Attach Listener"; | |
464 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
465 | |
466 // Initialize thread_oop to put it into the system threadGroup | |
467 Handle thread_group (THREAD, Universe::system_thread_group()); | |
468 JavaValue result(T_VOID); | |
469 JavaCalls::call_special(&result, thread_oop, | |
470 klass, | |
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471 vmSymbols::object_initializer_name(), |
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472 vmSymbols::threadgroup_string_void_signature(), |
0 | 473 thread_group, |
474 string, | |
475 CHECK); | |
476 | |
1142 | 477 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 478 JavaCalls::call_special(&result, |
479 thread_group, | |
480 group, | |
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481 vmSymbols::add_method_name(), |
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482 vmSymbols::thread_void_signature(), |
0 | 483 thread_oop, // ARG 1 |
484 CHECK); | |
485 | |
486 { MutexLocker mu(Threads_lock); | |
487 JavaThread* listener_thread = new JavaThread(&attach_listener_thread_entry); | |
488 | |
489 // Check that thread and osthread were created | |
490 if (listener_thread == NULL || listener_thread->osthread() == NULL) { | |
491 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
492 "unable to create new native thread"); | |
493 } | |
494 | |
495 java_lang_Thread::set_thread(thread_oop(), listener_thread); | |
496 java_lang_Thread::set_daemon(thread_oop()); | |
497 | |
498 listener_thread->set_threadObj(thread_oop()); | |
499 Threads::add(listener_thread); | |
500 Thread::start(listener_thread); | |
501 } | |
502 } | |
503 | |
504 // Performs clean-up tasks on platforms where we can detect that the last | |
505 // client has detached | |
506 void AttachListener::detachall() { | |
507 // call the platform dependent clean-up | |
508 pd_detachall(); | |
509 } |