Mercurial > hg > graal-compiler
annotate src/share/vm/services/attachListener.cpp @ 1751:2528b5bd749c
6980262: Memory leak when exception is thrown in static initializer
Summary: Use resource memory instead of c-heap for the exception message
Reviewed-by: phh, jmasa
author | kamg |
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date | Fri, 27 Aug 2010 15:05:28 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2007, 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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_attachListener.cpp.incl" | |
27 | |
28 volatile bool AttachListener::_initialized; | |
29 | |
30 // Implementation of "properties" command. | |
31 // | |
32 // Invokes sun.misc.VMSupport.serializePropertiesToByteArray to serialize | |
33 // the system properties into a byte array. | |
34 | |
35 static klassOop load_and_initialize_klass(symbolHandle sh, TRAPS) { | |
36 klassOop k = SystemDictionary::resolve_or_fail(sh, true, CHECK_NULL); | |
37 instanceKlassHandle ik (THREAD, k); | |
38 if (ik->should_be_initialized()) { | |
39 ik->initialize(CHECK_NULL); | |
40 } | |
41 return ik(); | |
42 } | |
43 | |
44 static jint get_properties(AttachOperation* op, outputStream* out, symbolHandle serializePropertiesMethod) { | |
45 Thread* THREAD = Thread::current(); | |
46 HandleMark hm; | |
47 | |
48 // load sun.misc.VMSupport | |
49 symbolHandle klass = vmSymbolHandles::sun_misc_VMSupport(); | |
50 klassOop k = load_and_initialize_klass(klass, THREAD); | |
51 if (HAS_PENDING_EXCEPTION) { | |
52 java_lang_Throwable::print(PENDING_EXCEPTION, out); | |
53 CLEAR_PENDING_EXCEPTION; | |
54 return JNI_ERR; | |
55 } | |
56 instanceKlassHandle ik(THREAD, k); | |
57 | |
58 // invoke the serializePropertiesToByteArray method | |
59 JavaValue result(T_OBJECT); | |
60 JavaCallArguments args; | |
61 | |
62 | |
63 symbolHandle signature = vmSymbolHandles::serializePropertiesToByteArray_signature(); | |
64 JavaCalls::call_static(&result, | |
65 ik, | |
66 serializePropertiesMethod, | |
67 signature, | |
68 &args, | |
69 THREAD); | |
70 if (HAS_PENDING_EXCEPTION) { | |
71 java_lang_Throwable::print(PENDING_EXCEPTION, out); | |
72 CLEAR_PENDING_EXCEPTION; | |
73 return JNI_ERR; | |
74 } | |
75 | |
76 // The result should be a [B | |
77 oop res = (oop)result.get_jobject(); | |
78 assert(res->is_typeArray(), "just checking"); | |
79 assert(typeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "just checking"); | |
80 | |
81 // copy the bytes to the output stream | |
82 typeArrayOop ba = typeArrayOop(res); | |
83 jbyte* addr = typeArrayOop(res)->byte_at_addr(0); | |
84 out->print_raw((const char*)addr, ba->length()); | |
85 | |
86 return JNI_OK; | |
87 } | |
88 | |
89 // Implementation of "properties" command. | |
90 static jint get_system_properties(AttachOperation* op, outputStream* out) { | |
91 return get_properties(op, out, vmSymbolHandles::serializePropertiesToByteArray_name()); | |
92 } | |
93 | |
94 // Implementation of "agent_properties" command. | |
95 static jint get_agent_properties(AttachOperation* op, outputStream* out) { | |
96 return get_properties(op, out, vmSymbolHandles::serializeAgentPropertiesToByteArray_name()); | |
97 } | |
98 | |
99 // Implementation of "datadump" command. | |
100 // | |
101 // Raises a SIGBREAK signal so that VM dump threads, does deadlock detection, | |
102 // etc. In theory this command should only post a DataDumpRequest to any | |
103 // JVMTI environment that has enabled this event. However it's useful to | |
104 // trigger the SIGBREAK handler. | |
105 | |
106 static jint data_dump(AttachOperation* op, outputStream* out) { | |
107 if (!ReduceSignalUsage) { | |
108 AttachListener::pd_data_dump(); | |
109 } else { | |
110 if (JvmtiExport::should_post_data_dump()) { | |
111 JvmtiExport::post_data_dump(); | |
112 } | |
113 } | |
114 return JNI_OK; | |
115 } | |
116 | |
117 // Implementation of "threaddump" command - essentially a remote ctrl-break | |
118 // | |
119 static jint thread_dump(AttachOperation* op, outputStream* out) { | |
120 bool print_concurrent_locks = false; | |
121 if (op->arg(0) != NULL && strcmp(op->arg(0), "-l") == 0) { | |
122 print_concurrent_locks = true; | |
123 } | |
124 | |
125 // thread stacks | |
126 VM_PrintThreads op1(out, print_concurrent_locks); | |
127 VMThread::execute(&op1); | |
128 | |
129 // JNI global handles | |
130 VM_PrintJNI op2(out); | |
131 VMThread::execute(&op2); | |
132 | |
133 // Deadlock detection | |
134 VM_FindDeadlocks op3(out); | |
135 VMThread::execute(&op3); | |
136 | |
137 return JNI_OK; | |
138 } | |
139 | |
140 #ifndef SERVICES_KERNEL // Heap dumping not supported | |
141 // Implementation of "dumpheap" command. | |
142 // | |
143 // Input arguments :- | |
144 // arg0: Name of the dump file | |
145 // arg1: "-live" or "-all" | |
146 jint dump_heap(AttachOperation* op, outputStream* out) { | |
147 const char* path = op->arg(0); | |
148 if (path == NULL || path[0] == '\0') { | |
149 out->print_cr("No dump file specified"); | |
150 } else { | |
151 bool live_objects_only = true; // default is true to retain the behavior before this change is made | |
152 const char* arg1 = op->arg(1); | |
153 if (arg1 != NULL && (strlen(arg1) > 0)) { | |
154 if (strcmp(arg1, "-all") != 0 && strcmp(arg1, "-live") != 0) { | |
155 out->print_cr("Invalid argument to dumpheap operation: %s", arg1); | |
156 return JNI_ERR; | |
157 } | |
158 live_objects_only = strcmp(arg1, "-live") == 0; | |
159 } | |
160 | |
161 // Request a full GC before heap dump if live_objects_only = true | |
162 // This helps reduces the amount of unreachable objects in the dump | |
163 // and makes it easier to browse. | |
164 HeapDumper dumper(live_objects_only /* request GC */); | |
165 int res = dumper.dump(op->arg(0)); | |
166 if (res == 0) { | |
167 out->print_cr("Heap dump file created"); | |
168 } else { | |
169 // heap dump failed | |
170 ResourceMark rm; | |
171 char* error = dumper.error_as_C_string(); | |
172 if (error == NULL) { | |
173 out->print_cr("Dump failed - reason unknown"); | |
174 } else { | |
175 out->print_cr("%s", error); | |
176 } | |
177 } | |
178 } | |
179 return JNI_OK; | |
180 } | |
181 #endif // SERVICES_KERNEL | |
182 | |
183 // Implementation of "inspectheap" command | |
184 // | |
185 // Input arguments :- | |
186 // arg0: "-live" or "-all" | |
187 static jint heap_inspection(AttachOperation* op, outputStream* out) { | |
188 bool live_objects_only = true; // default is true to retain the behavior before this change is made | |
189 const char* arg0 = op->arg(0); | |
190 if (arg0 != NULL && (strlen(arg0) > 0)) { | |
191 if (strcmp(arg0, "-all") != 0 && strcmp(arg0, "-live") != 0) { | |
192 out->print_cr("Invalid argument to inspectheap operation: %s", arg0); | |
193 return JNI_ERR; | |
194 } | |
195 live_objects_only = strcmp(arg0, "-live") == 0; | |
196 } | |
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197 VM_GC_HeapInspection heapop(out, live_objects_only /* request full gc */, true /* need_prologue */); |
0 | 198 VMThread::execute(&heapop); |
199 return JNI_OK; | |
200 } | |
201 | |
202 // set a boolean global flag using value from AttachOperation | |
203 static jint set_bool_flag(const char* name, AttachOperation* op, outputStream* out) { | |
204 bool value = true; | |
205 const char* arg1; | |
206 if ((arg1 = op->arg(1)) != NULL) { | |
207 int tmp; | |
208 int n = sscanf(arg1, "%d", &tmp); | |
209 if (n != 1) { | |
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210 out->print_cr("flag value must be a boolean (1 or 0)"); |
0 | 211 return JNI_ERR; |
212 } | |
213 value = (tmp != 0); | |
214 } | |
215 bool res = CommandLineFlags::boolAtPut((char*)name, &value, ATTACH_ON_DEMAND); | |
216 if (! res) { | |
217 out->print_cr("setting flag %s failed", name); | |
218 } | |
219 return res? JNI_OK : JNI_ERR; | |
220 } | |
221 | |
222 // set a intx global flag using value from AttachOperation | |
223 static jint set_intx_flag(const char* name, AttachOperation* op, outputStream* out) { | |
224 intx value; | |
225 const char* arg1; | |
226 if ((arg1 = op->arg(1)) != NULL) { | |
227 int n = sscanf(arg1, INTX_FORMAT, &value); | |
228 if (n != 1) { | |
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229 out->print_cr("flag value must be an integer"); |
0 | 230 return JNI_ERR; |
231 } | |
232 } | |
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233 bool res = CommandLineFlags::intxAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
0 | 234 if (! res) { |
235 out->print_cr("setting flag %s failed", name); | |
236 } | |
237 | |
238 return res? JNI_OK : JNI_ERR; | |
239 } | |
240 | |
241 // set a uintx global flag using value from AttachOperation | |
242 static jint set_uintx_flag(const char* name, AttachOperation* op, outputStream* out) { | |
243 uintx value; | |
244 const char* arg1; | |
245 if ((arg1 = op->arg(1)) != NULL) { | |
246 int n = sscanf(arg1, UINTX_FORMAT, &value); | |
247 if (n != 1) { | |
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248 out->print_cr("flag value must be an unsigned integer"); |
0 | 249 return JNI_ERR; |
250 } | |
251 } | |
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252 bool res = CommandLineFlags::uintxAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
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253 if (! res) { |
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254 out->print_cr("setting flag %s failed", name); |
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255 } |
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256 |
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257 return res? JNI_OK : JNI_ERR; |
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258 } |
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259 |
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260 // set a uint64_t global flag using value from AttachOperation |
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261 static jint set_uint64_t_flag(const char* name, AttachOperation* op, outputStream* out) { |
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262 uint64_t value; |
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263 const char* arg1; |
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264 if ((arg1 = op->arg(1)) != NULL) { |
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265 int n = sscanf(arg1, UINT64_FORMAT, &value); |
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266 if (n != 1) { |
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267 out->print_cr("flag value must be an unsigned 64-bit integer"); |
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268 return JNI_ERR; |
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269 } |
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270 } |
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271 bool res = CommandLineFlags::uint64_tAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
0 | 272 if (! res) { |
273 out->print_cr("setting flag %s failed", name); | |
274 } | |
275 | |
276 return res? JNI_OK : JNI_ERR; | |
277 } | |
278 | |
279 // set a string global flag using value from AttachOperation | |
280 static jint set_ccstr_flag(const char* name, AttachOperation* op, outputStream* out) { | |
281 const char* value; | |
282 if ((value = op->arg(1)) == NULL) { | |
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283 out->print_cr("flag value must be a string"); |
0 | 284 return JNI_ERR; |
285 } | |
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286 bool res = CommandLineFlags::ccstrAtPut((char*)name, &value, ATTACH_ON_DEMAND); |
0 | 287 if (res) { |
288 FREE_C_HEAP_ARRAY(char, value); | |
289 } else { | |
290 out->print_cr("setting flag %s failed", name); | |
291 } | |
292 | |
293 return res? JNI_OK : JNI_ERR; | |
294 } | |
295 | |
296 // Implementation of "setflag" command | |
297 static jint set_flag(AttachOperation* op, outputStream* out) { | |
298 | |
299 const char* name = NULL; | |
300 if ((name = op->arg(0)) == NULL) { | |
301 out->print_cr("flag name is missing"); | |
302 return JNI_ERR; | |
303 } | |
304 | |
305 Flag* f = Flag::find_flag((char*)name, strlen(name)); | |
306 if (f && f->is_external() && f->is_writeable()) { | |
307 if (f->is_bool()) { | |
308 return set_bool_flag(name, op, out); | |
309 } else if (f->is_intx()) { | |
310 return set_intx_flag(name, op, out); | |
311 } else if (f->is_uintx()) { | |
312 return set_uintx_flag(name, op, out); | |
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313 } else if (f->is_uint64_t()) { |
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314 return set_uint64_t_flag(name, op, out); |
0 | 315 } else if (f->is_ccstr()) { |
316 return set_ccstr_flag(name, op, out); | |
317 } else { | |
318 ShouldNotReachHere(); | |
319 return JNI_ERR; | |
320 } | |
321 } else { | |
322 return AttachListener::pd_set_flag(op, out); | |
323 } | |
324 } | |
325 | |
326 // Implementation of "printflag" command | |
327 static jint print_flag(AttachOperation* op, outputStream* out) { | |
328 const char* name = NULL; | |
329 if ((name = op->arg(0)) == NULL) { | |
330 out->print_cr("flag name is missing"); | |
331 return JNI_ERR; | |
332 } | |
333 Flag* f = Flag::find_flag((char*)name, strlen(name)); | |
334 if (f) { | |
335 f->print_as_flag(out); | |
336 out->print_cr(""); | |
337 } else { | |
338 out->print_cr("no such flag '%s'", name); | |
339 } | |
340 return JNI_OK; | |
341 } | |
342 | |
343 // Table to map operation names to functions. | |
344 | |
345 // names must be of length <= AttachOperation::name_length_max | |
346 static AttachOperationFunctionInfo funcs[] = { | |
347 { "agentProperties", get_agent_properties }, | |
348 { "datadump", data_dump }, | |
349 #ifndef SERVICES_KERNEL | |
350 { "dumpheap", dump_heap }, | |
351 #endif // SERVICES_KERNEL | |
352 { "load", JvmtiExport::load_agent_library }, | |
353 { "properties", get_system_properties }, | |
354 { "threaddump", thread_dump }, | |
355 { "inspectheap", heap_inspection }, | |
356 { "setflag", set_flag }, | |
357 { "printflag", print_flag }, | |
358 { NULL, NULL } | |
359 }; | |
360 | |
361 | |
362 | |
363 // The Attach Listener threads services a queue. It dequeues an operation | |
364 // from the queue, examines the operation name (command), and dispatches | |
365 // to the corresponding function to perform the operation. | |
366 | |
367 static void attach_listener_thread_entry(JavaThread* thread, TRAPS) { | |
368 os::set_priority(thread, NearMaxPriority); | |
369 | |
370 if (AttachListener::pd_init() != 0) { | |
371 return; | |
372 } | |
373 AttachListener::set_initialized(); | |
374 | |
375 for (;;) { | |
376 AttachOperation* op = AttachListener::dequeue(); | |
377 if (op == NULL) { | |
378 return; // dequeue failed or shutdown | |
379 } | |
380 | |
381 ResourceMark rm; | |
382 bufferedStream st; | |
383 jint res = JNI_OK; | |
384 | |
385 // handle special detachall operation | |
386 if (strcmp(op->name(), AttachOperation::detachall_operation_name()) == 0) { | |
387 AttachListener::detachall(); | |
388 } else { | |
389 // find the function to dispatch too | |
390 AttachOperationFunctionInfo* info = NULL; | |
391 for (int i=0; funcs[i].name != NULL; i++) { | |
392 const char* name = funcs[i].name; | |
393 assert(strlen(name) <= AttachOperation::name_length_max, "operation <= name_length_max"); | |
394 if (strcmp(op->name(), name) == 0) { | |
395 info = &(funcs[i]); | |
396 break; | |
397 } | |
398 } | |
399 | |
400 // check for platform dependent attach operation | |
401 if (info == NULL) { | |
402 info = AttachListener::pd_find_operation(op->name()); | |
403 } | |
404 | |
405 if (info != NULL) { | |
406 // dispatch to the function that implements this operation | |
407 res = (info->func)(op, &st); | |
408 } else { | |
409 st.print("Operation %s not recognized!", op->name()); | |
410 res = JNI_ERR; | |
411 } | |
412 } | |
413 | |
414 // operation complete - send result and output to client | |
415 op->complete(res, &st); | |
416 } | |
417 } | |
418 | |
419 // Starts the Attach Listener thread | |
420 void AttachListener::init() { | |
421 EXCEPTION_MARK; | |
422 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK); | |
423 instanceKlassHandle klass (THREAD, k); | |
424 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
425 | |
426 const char thread_name[] = "Attach Listener"; | |
427 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
428 | |
429 // Initialize thread_oop to put it into the system threadGroup | |
430 Handle thread_group (THREAD, Universe::system_thread_group()); | |
431 JavaValue result(T_VOID); | |
432 JavaCalls::call_special(&result, thread_oop, | |
433 klass, | |
434 vmSymbolHandles::object_initializer_name(), | |
435 vmSymbolHandles::threadgroup_string_void_signature(), | |
436 thread_group, | |
437 string, | |
438 CHECK); | |
439 | |
1142 | 440 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 441 JavaCalls::call_special(&result, |
442 thread_group, | |
443 group, | |
444 vmSymbolHandles::add_method_name(), | |
445 vmSymbolHandles::thread_void_signature(), | |
446 thread_oop, // ARG 1 | |
447 CHECK); | |
448 | |
449 { MutexLocker mu(Threads_lock); | |
450 JavaThread* listener_thread = new JavaThread(&attach_listener_thread_entry); | |
451 | |
452 // Check that thread and osthread were created | |
453 if (listener_thread == NULL || listener_thread->osthread() == NULL) { | |
454 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
455 "unable to create new native thread"); | |
456 } | |
457 | |
458 java_lang_Thread::set_thread(thread_oop(), listener_thread); | |
459 java_lang_Thread::set_daemon(thread_oop()); | |
460 | |
461 listener_thread->set_threadObj(thread_oop()); | |
462 Threads::add(listener_thread); | |
463 Thread::start(listener_thread); | |
464 } | |
465 } | |
466 | |
467 // Performs clean-up tasks on platforms where we can detect that the last | |
468 // client has detached | |
469 void AttachListener::detachall() { | |
470 // call the platform dependent clean-up | |
471 pd_detachall(); | |
472 } |