Mercurial > hg > graal-compiler
annotate src/share/vm/services/attachListener.cpp @ 878:abe076e3636f
6864003: Modify JVM_FindClassFromBootLoader to return null if class not found
Summary: JVM_FindClassFromBootLoader returns null if class not found
Reviewed-by: acorn, alanb, dholmes
author | mchung |
---|---|
date | Mon, 27 Jul 2009 09:06:22 -0700 |
parents | c6c601a0f2d6 |
children | ba7ea42fc66e |
rev | line source |
---|---|
0 | 1 /* |
2 * Copyright 2005-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
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 } | |
615
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
0
diff
changeset
|
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) { | |
210 out->print_cr("flag value has to be boolean (1 or 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) { | |
229 out->print_cr("flag value has to be integer"); | |
230 return JNI_ERR; | |
231 } | |
232 } | |
233 bool res = CommandLineFlags::intxAtPut((char*)name, &value, ATTACH_ON_DEMAND); | |
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) { | |
248 out->print_cr("flag value has to be integer"); | |
249 return JNI_ERR; | |
250 } | |
251 } | |
252 bool res = CommandLineFlags::uintxAtPut((char*)name, &value, ATTACH_ON_DEMAND); | |
253 if (! res) { | |
254 out->print_cr("setting flag %s failed", name); | |
255 } | |
256 | |
257 return res? JNI_OK : JNI_ERR; | |
258 } | |
259 | |
260 // set a string global flag using value from AttachOperation | |
261 static jint set_ccstr_flag(const char* name, AttachOperation* op, outputStream* out) { | |
262 const char* value; | |
263 if ((value = op->arg(1)) == NULL) { | |
264 out->print_cr("flag value has to be a string"); | |
265 return JNI_ERR; | |
266 } | |
267 bool res = CommandLineFlags::ccstrAtPut((char*)name, &value, ATTACH_ON_DEMAND); | |
268 if (res) { | |
269 FREE_C_HEAP_ARRAY(char, value); | |
270 } else { | |
271 out->print_cr("setting flag %s failed", name); | |
272 } | |
273 | |
274 return res? JNI_OK : JNI_ERR; | |
275 } | |
276 | |
277 // Implementation of "setflag" command | |
278 static jint set_flag(AttachOperation* op, outputStream* out) { | |
279 | |
280 const char* name = NULL; | |
281 if ((name = op->arg(0)) == NULL) { | |
282 out->print_cr("flag name is missing"); | |
283 return JNI_ERR; | |
284 } | |
285 | |
286 Flag* f = Flag::find_flag((char*)name, strlen(name)); | |
287 if (f && f->is_external() && f->is_writeable()) { | |
288 if (f->is_bool()) { | |
289 return set_bool_flag(name, op, out); | |
290 } else if (f->is_intx()) { | |
291 return set_intx_flag(name, op, out); | |
292 } else if (f->is_uintx()) { | |
293 return set_uintx_flag(name, op, out); | |
294 } else if (f->is_ccstr()) { | |
295 return set_ccstr_flag(name, op, out); | |
296 } else { | |
297 ShouldNotReachHere(); | |
298 return JNI_ERR; | |
299 } | |
300 } else { | |
301 return AttachListener::pd_set_flag(op, out); | |
302 } | |
303 } | |
304 | |
305 // Implementation of "printflag" command | |
306 static jint print_flag(AttachOperation* op, outputStream* out) { | |
307 const char* name = NULL; | |
308 if ((name = op->arg(0)) == NULL) { | |
309 out->print_cr("flag name is missing"); | |
310 return JNI_ERR; | |
311 } | |
312 Flag* f = Flag::find_flag((char*)name, strlen(name)); | |
313 if (f) { | |
314 f->print_as_flag(out); | |
315 out->print_cr(""); | |
316 } else { | |
317 out->print_cr("no such flag '%s'", name); | |
318 } | |
319 return JNI_OK; | |
320 } | |
321 | |
322 // Table to map operation names to functions. | |
323 | |
324 // names must be of length <= AttachOperation::name_length_max | |
325 static AttachOperationFunctionInfo funcs[] = { | |
326 { "agentProperties", get_agent_properties }, | |
327 { "datadump", data_dump }, | |
328 #ifndef SERVICES_KERNEL | |
329 { "dumpheap", dump_heap }, | |
330 #endif // SERVICES_KERNEL | |
331 { "load", JvmtiExport::load_agent_library }, | |
332 { "properties", get_system_properties }, | |
333 { "threaddump", thread_dump }, | |
334 { "inspectheap", heap_inspection }, | |
335 { "setflag", set_flag }, | |
336 { "printflag", print_flag }, | |
337 { NULL, NULL } | |
338 }; | |
339 | |
340 | |
341 | |
342 // The Attach Listener threads services a queue. It dequeues an operation | |
343 // from the queue, examines the operation name (command), and dispatches | |
344 // to the corresponding function to perform the operation. | |
345 | |
346 static void attach_listener_thread_entry(JavaThread* thread, TRAPS) { | |
347 os::set_priority(thread, NearMaxPriority); | |
348 | |
349 if (AttachListener::pd_init() != 0) { | |
350 return; | |
351 } | |
352 AttachListener::set_initialized(); | |
353 | |
354 for (;;) { | |
355 AttachOperation* op = AttachListener::dequeue(); | |
356 if (op == NULL) { | |
357 return; // dequeue failed or shutdown | |
358 } | |
359 | |
360 ResourceMark rm; | |
361 bufferedStream st; | |
362 jint res = JNI_OK; | |
363 | |
364 // handle special detachall operation | |
365 if (strcmp(op->name(), AttachOperation::detachall_operation_name()) == 0) { | |
366 AttachListener::detachall(); | |
367 } else { | |
368 // find the function to dispatch too | |
369 AttachOperationFunctionInfo* info = NULL; | |
370 for (int i=0; funcs[i].name != NULL; i++) { | |
371 const char* name = funcs[i].name; | |
372 assert(strlen(name) <= AttachOperation::name_length_max, "operation <= name_length_max"); | |
373 if (strcmp(op->name(), name) == 0) { | |
374 info = &(funcs[i]); | |
375 break; | |
376 } | |
377 } | |
378 | |
379 // check for platform dependent attach operation | |
380 if (info == NULL) { | |
381 info = AttachListener::pd_find_operation(op->name()); | |
382 } | |
383 | |
384 if (info != NULL) { | |
385 // dispatch to the function that implements this operation | |
386 res = (info->func)(op, &st); | |
387 } else { | |
388 st.print("Operation %s not recognized!", op->name()); | |
389 res = JNI_ERR; | |
390 } | |
391 } | |
392 | |
393 // operation complete - send result and output to client | |
394 op->complete(res, &st); | |
395 } | |
396 } | |
397 | |
398 // Starts the Attach Listener thread | |
399 void AttachListener::init() { | |
400 EXCEPTION_MARK; | |
401 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK); | |
402 instanceKlassHandle klass (THREAD, k); | |
403 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
404 | |
405 const char thread_name[] = "Attach Listener"; | |
406 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
407 | |
408 // Initialize thread_oop to put it into the system threadGroup | |
409 Handle thread_group (THREAD, Universe::system_thread_group()); | |
410 JavaValue result(T_VOID); | |
411 JavaCalls::call_special(&result, thread_oop, | |
412 klass, | |
413 vmSymbolHandles::object_initializer_name(), | |
414 vmSymbolHandles::threadgroup_string_void_signature(), | |
415 thread_group, | |
416 string, | |
417 CHECK); | |
418 | |
419 KlassHandle group(THREAD, SystemDictionary::threadGroup_klass()); | |
420 JavaCalls::call_special(&result, | |
421 thread_group, | |
422 group, | |
423 vmSymbolHandles::add_method_name(), | |
424 vmSymbolHandles::thread_void_signature(), | |
425 thread_oop, // ARG 1 | |
426 CHECK); | |
427 | |
428 { MutexLocker mu(Threads_lock); | |
429 JavaThread* listener_thread = new JavaThread(&attach_listener_thread_entry); | |
430 | |
431 // Check that thread and osthread were created | |
432 if (listener_thread == NULL || listener_thread->osthread() == NULL) { | |
433 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
434 "unable to create new native thread"); | |
435 } | |
436 | |
437 java_lang_Thread::set_thread(thread_oop(), listener_thread); | |
438 java_lang_Thread::set_daemon(thread_oop()); | |
439 | |
440 listener_thread->set_threadObj(thread_oop()); | |
441 Threads::add(listener_thread); | |
442 Thread::start(listener_thread); | |
443 } | |
444 } | |
445 | |
446 // Performs clean-up tasks on platforms where we can detect that the last | |
447 // client has detached | |
448 void AttachListener::detachall() { | |
449 // call the platform dependent clean-up | |
450 pd_detachall(); | |
451 } |