Mercurial > hg > truffle
annotate src/share/vm/services/attachListener.cpp @ 4279:cdcd26f86af5
Helper class for slow paths
author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Thu, 12 Jan 2012 13:46:26 -0800 |
parents | 3b688d6ff3d0 |
children | 4f25538b54c9 |
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. | |
102 static jint get_system_properties(AttachOperation* op, outputStream* out) { | |
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103 return get_properties(op, out, vmSymbols::serializePropertiesToByteArray_name()); |
0 | 104 } |
105 | |
106 // Implementation of "agent_properties" command. | |
107 static jint get_agent_properties(AttachOperation* op, outputStream* out) { | |
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108 return get_properties(op, out, vmSymbols::serializeAgentPropertiesToByteArray_name()); |
0 | 109 } |
110 | |
111 // Implementation of "datadump" command. | |
112 // | |
113 // Raises a SIGBREAK signal so that VM dump threads, does deadlock detection, | |
114 // etc. In theory this command should only post a DataDumpRequest to any | |
115 // JVMTI environment that has enabled this event. However it's useful to | |
116 // trigger the SIGBREAK handler. | |
117 | |
118 static jint data_dump(AttachOperation* op, outputStream* out) { | |
119 if (!ReduceSignalUsage) { | |
120 AttachListener::pd_data_dump(); | |
121 } else { | |
122 if (JvmtiExport::should_post_data_dump()) { | |
123 JvmtiExport::post_data_dump(); | |
124 } | |
125 } | |
126 return JNI_OK; | |
127 } | |
128 | |
129 // Implementation of "threaddump" command - essentially a remote ctrl-break | |
130 // | |
131 static jint thread_dump(AttachOperation* op, outputStream* out) { | |
132 bool print_concurrent_locks = false; | |
133 if (op->arg(0) != NULL && strcmp(op->arg(0), "-l") == 0) { | |
134 print_concurrent_locks = true; | |
135 } | |
136 | |
137 // thread stacks | |
138 VM_PrintThreads op1(out, print_concurrent_locks); | |
139 VMThread::execute(&op1); | |
140 | |
141 // JNI global handles | |
142 VM_PrintJNI op2(out); | |
143 VMThread::execute(&op2); | |
144 | |
145 // Deadlock detection | |
146 VM_FindDeadlocks op3(out); | |
147 VMThread::execute(&op3); | |
148 | |
149 return JNI_OK; | |
150 } | |
151 | |
4133 | 152 // A jcmd attach operation request was received, which will now |
153 // dispatch to the diagnostic commands used for serviceability functions. | |
154 static jint jcmd(AttachOperation* op, outputStream* out) { | |
155 Thread* THREAD = Thread::current(); | |
156 // All the supplied jcmd arguments are stored as a single | |
157 // string (op->arg(0)). This is parsed by the Dcmd framework. | |
158 DCmd::parse_and_execute(out, op->arg(0), ' ', THREAD); | |
159 if (HAS_PENDING_EXCEPTION) { | |
160 java_lang_Throwable::print(PENDING_EXCEPTION, out); | |
161 CLEAR_PENDING_EXCEPTION; | |
162 // The exception has been printed on the output stream | |
163 // If the JVM returns JNI_ERR, the attachAPI throws a generic I/O | |
164 // exception and the content of the output stream is not processed. | |
165 // By returning JNI_OK, the exception will be displayed on the client side | |
166 } | |
167 return JNI_OK; | |
168 } | |
169 | |
0 | 170 #ifndef SERVICES_KERNEL // Heap dumping not supported |
171 // Implementation of "dumpheap" command. | |
172 // | |
173 // Input arguments :- | |
174 // arg0: Name of the dump file | |
175 // arg1: "-live" or "-all" | |
176 jint dump_heap(AttachOperation* op, outputStream* out) { | |
177 const char* path = op->arg(0); | |
178 if (path == NULL || path[0] == '\0') { | |
179 out->print_cr("No dump file specified"); | |
180 } else { | |
181 bool live_objects_only = true; // default is true to retain the behavior before this change is made | |
182 const char* arg1 = op->arg(1); | |
183 if (arg1 != NULL && (strlen(arg1) > 0)) { | |
184 if (strcmp(arg1, "-all") != 0 && strcmp(arg1, "-live") != 0) { | |
185 out->print_cr("Invalid argument to dumpheap operation: %s", arg1); | |
186 return JNI_ERR; | |
187 } | |
188 live_objects_only = strcmp(arg1, "-live") == 0; | |
189 } | |
190 | |
191 // Request a full GC before heap dump if live_objects_only = true | |
192 // This helps reduces the amount of unreachable objects in the dump | |
193 // and makes it easier to browse. | |
194 HeapDumper dumper(live_objects_only /* request GC */); | |
195 int res = dumper.dump(op->arg(0)); | |
196 if (res == 0) { | |
197 out->print_cr("Heap dump file created"); | |
198 } else { | |
199 // heap dump failed | |
200 ResourceMark rm; | |
201 char* error = dumper.error_as_C_string(); | |
202 if (error == NULL) { | |
203 out->print_cr("Dump failed - reason unknown"); | |
204 } else { | |
205 out->print_cr("%s", error); | |
206 } | |
207 } | |
208 } | |
209 return JNI_OK; | |
210 } | |
211 #endif // SERVICES_KERNEL | |
212 | |
213 // Implementation of "inspectheap" command | |
214 // | |
215 // Input arguments :- | |
216 // arg0: "-live" or "-all" | |
217 static jint heap_inspection(AttachOperation* op, outputStream* out) { | |
218 bool live_objects_only = true; // default is true to retain the behavior before this change is made | |
219 const char* arg0 = op->arg(0); | |
220 if (arg0 != NULL && (strlen(arg0) > 0)) { | |
221 if (strcmp(arg0, "-all") != 0 && strcmp(arg0, "-live") != 0) { | |
222 out->print_cr("Invalid argument to inspectheap operation: %s", arg0); | |
223 return JNI_ERR; | |
224 } | |
225 live_objects_only = strcmp(arg0, "-live") == 0; | |
226 } | |
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227 VM_GC_HeapInspection heapop(out, live_objects_only /* request full gc */, true /* need_prologue */); |
0 | 228 VMThread::execute(&heapop); |
229 return JNI_OK; | |
230 } | |
231 | |
232 // set a boolean global flag using value from AttachOperation | |
233 static jint set_bool_flag(const char* name, AttachOperation* op, outputStream* out) { | |
234 bool value = true; | |
235 const char* arg1; | |
236 if ((arg1 = op->arg(1)) != NULL) { | |
237 int tmp; | |
238 int n = sscanf(arg1, "%d", &tmp); | |
239 if (n != 1) { | |
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240 out->print_cr("flag value must be a boolean (1 or 0)"); |
0 | 241 return JNI_ERR; |
242 } | |
243 value = (tmp != 0); | |
244 } | |
245 bool res = CommandLineFlags::boolAtPut((char*)name, &value, ATTACH_ON_DEMAND); | |
246 if (! res) { | |
247 out->print_cr("setting flag %s failed", name); | |
248 } | |
249 return res? JNI_OK : JNI_ERR; | |
250 } | |
251 | |
252 // set a intx global flag using value from AttachOperation | |
253 static jint set_intx_flag(const char* name, AttachOperation* op, outputStream* out) { | |
254 intx value; | |
255 const char* arg1; | |
256 if ((arg1 = op->arg(1)) != NULL) { | |
257 int n = sscanf(arg1, INTX_FORMAT, &value); | |
258 if (n != 1) { | |
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259 out->print_cr("flag value must be an integer"); |
0 | 260 return JNI_ERR; |
261 } | |
262 } | |
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263 bool res = CommandLineFlags::intxAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
0 | 264 if (! res) { |
265 out->print_cr("setting flag %s failed", name); | |
266 } | |
267 | |
268 return res? JNI_OK : JNI_ERR; | |
269 } | |
270 | |
271 // set a uintx global flag using value from AttachOperation | |
272 static jint set_uintx_flag(const char* name, AttachOperation* op, outputStream* out) { | |
273 uintx value; | |
274 const char* arg1; | |
275 if ((arg1 = op->arg(1)) != NULL) { | |
276 int n = sscanf(arg1, UINTX_FORMAT, &value); | |
277 if (n != 1) { | |
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278 out->print_cr("flag value must be an unsigned integer"); |
0 | 279 return JNI_ERR; |
280 } | |
281 } | |
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282 bool res = CommandLineFlags::uintxAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
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283 if (! res) { |
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284 out->print_cr("setting flag %s failed", name); |
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285 } |
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286 |
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287 return res? JNI_OK : JNI_ERR; |
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288 } |
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289 |
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290 // set a uint64_t global flag using value from AttachOperation |
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291 static jint set_uint64_t_flag(const char* name, AttachOperation* op, outputStream* out) { |
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292 uint64_t value; |
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293 const char* arg1; |
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294 if ((arg1 = op->arg(1)) != NULL) { |
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295 int n = sscanf(arg1, UINT64_FORMAT, &value); |
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296 if (n != 1) { |
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297 out->print_cr("flag value must be an unsigned 64-bit integer"); |
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298 return JNI_ERR; |
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299 } |
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300 } |
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301 bool res = CommandLineFlags::uint64_tAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
0 | 302 if (! res) { |
303 out->print_cr("setting flag %s failed", name); | |
304 } | |
305 | |
306 return res? JNI_OK : JNI_ERR; | |
307 } | |
308 | |
309 // set a string global flag using value from AttachOperation | |
310 static jint set_ccstr_flag(const char* name, AttachOperation* op, outputStream* out) { | |
311 const char* value; | |
312 if ((value = op->arg(1)) == NULL) { | |
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313 out->print_cr("flag value must be a string"); |
0 | 314 return JNI_ERR; |
315 } | |
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316 bool res = CommandLineFlags::ccstrAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
0 | 317 if (res) { |
318 FREE_C_HEAP_ARRAY(char, value); | |
319 } else { | |
320 out->print_cr("setting flag %s failed", name); | |
321 } | |
322 | |
323 return res? JNI_OK : JNI_ERR; | |
324 } | |
325 | |
326 // Implementation of "setflag" command | |
327 static jint set_flag(AttachOperation* op, outputStream* out) { | |
328 | |
329 const char* name = NULL; | |
330 if ((name = op->arg(0)) == NULL) { | |
331 out->print_cr("flag name is missing"); | |
332 return JNI_ERR; | |
333 } | |
334 | |
335 Flag* f = Flag::find_flag((char*)name, strlen(name)); | |
336 if (f && f->is_external() && f->is_writeable()) { | |
337 if (f->is_bool()) { | |
338 return set_bool_flag(name, op, out); | |
339 } else if (f->is_intx()) { | |
340 return set_intx_flag(name, op, out); | |
341 } else if (f->is_uintx()) { | |
342 return set_uintx_flag(name, op, out); | |
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343 } else if (f->is_uint64_t()) { |
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344 return set_uint64_t_flag(name, op, out); |
0 | 345 } else if (f->is_ccstr()) { |
346 return set_ccstr_flag(name, op, out); | |
347 } else { | |
348 ShouldNotReachHere(); | |
349 return JNI_ERR; | |
350 } | |
351 } else { | |
352 return AttachListener::pd_set_flag(op, out); | |
353 } | |
354 } | |
355 | |
356 // Implementation of "printflag" command | |
357 static jint print_flag(AttachOperation* op, outputStream* out) { | |
358 const char* name = NULL; | |
359 if ((name = op->arg(0)) == NULL) { | |
360 out->print_cr("flag name is missing"); | |
361 return JNI_ERR; | |
362 } | |
363 Flag* f = Flag::find_flag((char*)name, strlen(name)); | |
364 if (f) { | |
365 f->print_as_flag(out); | |
366 out->print_cr(""); | |
367 } else { | |
368 out->print_cr("no such flag '%s'", name); | |
369 } | |
370 return JNI_OK; | |
371 } | |
372 | |
373 // Table to map operation names to functions. | |
374 | |
375 // names must be of length <= AttachOperation::name_length_max | |
376 static AttachOperationFunctionInfo funcs[] = { | |
377 { "agentProperties", get_agent_properties }, | |
378 { "datadump", data_dump }, | |
379 #ifndef SERVICES_KERNEL | |
380 { "dumpheap", dump_heap }, | |
381 #endif // SERVICES_KERNEL | |
382 { "load", JvmtiExport::load_agent_library }, | |
383 { "properties", get_system_properties }, | |
384 { "threaddump", thread_dump }, | |
385 { "inspectheap", heap_inspection }, | |
386 { "setflag", set_flag }, | |
387 { "printflag", print_flag }, | |
4133 | 388 { "jcmd", jcmd }, |
0 | 389 { NULL, NULL } |
390 }; | |
391 | |
392 | |
393 | |
394 // The Attach Listener threads services a queue. It dequeues an operation | |
395 // from the queue, examines the operation name (command), and dispatches | |
396 // to the corresponding function to perform the operation. | |
397 | |
398 static void attach_listener_thread_entry(JavaThread* thread, TRAPS) { | |
399 os::set_priority(thread, NearMaxPriority); | |
400 | |
401 if (AttachListener::pd_init() != 0) { | |
402 return; | |
403 } | |
404 AttachListener::set_initialized(); | |
405 | |
406 for (;;) { | |
407 AttachOperation* op = AttachListener::dequeue(); | |
408 if (op == NULL) { | |
409 return; // dequeue failed or shutdown | |
410 } | |
411 | |
412 ResourceMark rm; | |
413 bufferedStream st; | |
414 jint res = JNI_OK; | |
415 | |
416 // handle special detachall operation | |
417 if (strcmp(op->name(), AttachOperation::detachall_operation_name()) == 0) { | |
418 AttachListener::detachall(); | |
419 } else { | |
420 // find the function to dispatch too | |
421 AttachOperationFunctionInfo* info = NULL; | |
422 for (int i=0; funcs[i].name != NULL; i++) { | |
423 const char* name = funcs[i].name; | |
424 assert(strlen(name) <= AttachOperation::name_length_max, "operation <= name_length_max"); | |
425 if (strcmp(op->name(), name) == 0) { | |
426 info = &(funcs[i]); | |
427 break; | |
428 } | |
429 } | |
430 | |
431 // check for platform dependent attach operation | |
432 if (info == NULL) { | |
433 info = AttachListener::pd_find_operation(op->name()); | |
434 } | |
435 | |
436 if (info != NULL) { | |
437 // dispatch to the function that implements this operation | |
438 res = (info->func)(op, &st); | |
439 } else { | |
440 st.print("Operation %s not recognized!", op->name()); | |
441 res = JNI_ERR; | |
442 } | |
443 } | |
444 | |
445 // operation complete - send result and output to client | |
446 op->complete(res, &st); | |
447 } | |
448 } | |
449 | |
450 // Starts the Attach Listener thread | |
451 void AttachListener::init() { | |
452 EXCEPTION_MARK; | |
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453 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 454 instanceKlassHandle klass (THREAD, k); |
455 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
456 | |
457 const char thread_name[] = "Attach Listener"; | |
458 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
459 | |
460 // Initialize thread_oop to put it into the system threadGroup | |
461 Handle thread_group (THREAD, Universe::system_thread_group()); | |
462 JavaValue result(T_VOID); | |
463 JavaCalls::call_special(&result, thread_oop, | |
464 klass, | |
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465 vmSymbols::object_initializer_name(), |
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466 vmSymbols::threadgroup_string_void_signature(), |
0 | 467 thread_group, |
468 string, | |
469 CHECK); | |
470 | |
1142 | 471 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 472 JavaCalls::call_special(&result, |
473 thread_group, | |
474 group, | |
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475 vmSymbols::add_method_name(), |
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476 vmSymbols::thread_void_signature(), |
0 | 477 thread_oop, // ARG 1 |
478 CHECK); | |
479 | |
480 { MutexLocker mu(Threads_lock); | |
481 JavaThread* listener_thread = new JavaThread(&attach_listener_thread_entry); | |
482 | |
483 // Check that thread and osthread were created | |
484 if (listener_thread == NULL || listener_thread->osthread() == NULL) { | |
485 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
486 "unable to create new native thread"); | |
487 } | |
488 | |
489 java_lang_Thread::set_thread(thread_oop(), listener_thread); | |
490 java_lang_Thread::set_daemon(thread_oop()); | |
491 | |
492 listener_thread->set_threadObj(thread_oop()); | |
493 Threads::add(listener_thread); | |
494 Thread::start(listener_thread); | |
495 } | |
496 } | |
497 | |
498 // Performs clean-up tasks on platforms where we can detect that the last | |
499 // client has detached | |
500 void AttachListener::detachall() { | |
501 // call the platform dependent clean-up | |
502 pd_detachall(); | |
503 } |