Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiImpl.cpp @ 14465:28f281e8de1d
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author | kvn |
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date | Thu, 20 Feb 2014 12:20:56 -0800 |
parents | 910026b800b8 |
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rev | line source |
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0 | 1 /* |
7951 | 2 * Copyright (c) 2003, 2013, 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/systemDictionary.hpp" | |
27 #include "interpreter/interpreter.hpp" | |
28 #include "jvmtifiles/jvmtiEnv.hpp" | |
29 #include "memory/resourceArea.hpp" | |
30 #include "oops/instanceKlass.hpp" | |
31 #include "prims/jvmtiAgentThread.hpp" | |
32 #include "prims/jvmtiEventController.inline.hpp" | |
33 #include "prims/jvmtiImpl.hpp" | |
34 #include "prims/jvmtiRedefineClasses.hpp" | |
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35 #include "runtime/atomic.hpp" |
1972 | 36 #include "runtime/deoptimization.hpp" |
37 #include "runtime/handles.hpp" | |
38 #include "runtime/handles.inline.hpp" | |
39 #include "runtime/interfaceSupport.hpp" | |
40 #include "runtime/javaCalls.hpp" | |
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41 #include "runtime/os.hpp" |
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42 #include "runtime/serviceThread.hpp" |
1972 | 43 #include "runtime/signature.hpp" |
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44 #include "runtime/thread.inline.hpp" |
1972 | 45 #include "runtime/vframe.hpp" |
46 #include "runtime/vframe_hp.hpp" | |
47 #include "runtime/vm_operations.hpp" | |
48 #include "utilities/exceptions.hpp" | |
0 | 49 |
50 // | |
51 // class JvmtiAgentThread | |
52 // | |
53 // JavaThread used to wrap a thread started by an agent | |
54 // using the JVMTI method RunAgentThread. | |
55 // | |
56 | |
57 JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg) | |
58 : JavaThread(start_function_wrapper) { | |
59 _env = env; | |
60 _start_fn = start_fn; | |
61 _start_arg = start_arg; | |
62 } | |
63 | |
64 void | |
65 JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) { | |
66 // It is expected that any Agent threads will be created as | |
67 // Java Threads. If this is the case, notification of the creation | |
68 // of the thread is given in JavaThread::thread_main(). | |
69 assert(thread->is_Java_thread(), "debugger thread should be a Java Thread"); | |
70 assert(thread == JavaThread::current(), "sanity check"); | |
71 | |
72 JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread; | |
73 dthread->call_start_function(); | |
74 } | |
75 | |
76 void | |
77 JvmtiAgentThread::call_start_function() { | |
78 ThreadToNativeFromVM transition(this); | |
79 _start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg); | |
80 } | |
81 | |
82 | |
83 // | |
84 // class GrowableCache - private methods | |
85 // | |
86 | |
87 void GrowableCache::recache() { | |
88 int len = _elements->length(); | |
89 | |
6197 | 90 FREE_C_HEAP_ARRAY(address, _cache, mtInternal); |
91 _cache = NEW_C_HEAP_ARRAY(address,len+1, mtInternal); | |
0 | 92 |
93 for (int i=0; i<len; i++) { | |
94 _cache[i] = _elements->at(i)->getCacheValue(); | |
95 // | |
96 // The cache entry has gone bad. Without a valid frame pointer | |
97 // value, the entry is useless so we simply delete it in product | |
98 // mode. The call to remove() will rebuild the cache again | |
99 // without the bad entry. | |
100 // | |
101 if (_cache[i] == NULL) { | |
102 assert(false, "cannot recache NULL elements"); | |
103 remove(i); | |
104 return; | |
105 } | |
106 } | |
107 _cache[len] = NULL; | |
108 | |
109 _listener_fun(_this_obj,_cache); | |
110 } | |
111 | |
112 bool GrowableCache::equals(void* v, GrowableElement *e2) { | |
113 GrowableElement *e1 = (GrowableElement *) v; | |
114 assert(e1 != NULL, "e1 != NULL"); | |
115 assert(e2 != NULL, "e2 != NULL"); | |
116 | |
117 return e1->equals(e2); | |
118 } | |
119 | |
120 // | |
121 // class GrowableCache - public methods | |
122 // | |
123 | |
124 GrowableCache::GrowableCache() { | |
125 _this_obj = NULL; | |
126 _listener_fun = NULL; | |
127 _elements = NULL; | |
128 _cache = NULL; | |
129 } | |
130 | |
131 GrowableCache::~GrowableCache() { | |
132 clear(); | |
133 delete _elements; | |
6197 | 134 FREE_C_HEAP_ARRAY(address, _cache, mtInternal); |
0 | 135 } |
136 | |
137 void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
138 _this_obj = this_obj; | |
139 _listener_fun = listener_fun; | |
6197 | 140 _elements = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<GrowableElement*>(5,true); |
0 | 141 recache(); |
142 } | |
143 | |
144 // number of elements in the collection | |
145 int GrowableCache::length() { | |
146 return _elements->length(); | |
147 } | |
148 | |
149 // get the value of the index element in the collection | |
150 GrowableElement* GrowableCache::at(int index) { | |
151 GrowableElement *e = (GrowableElement *) _elements->at(index); | |
152 assert(e != NULL, "e != NULL"); | |
153 return e; | |
154 } | |
155 | |
156 int GrowableCache::find(GrowableElement* e) { | |
157 return _elements->find(e, GrowableCache::equals); | |
158 } | |
159 | |
160 // append a copy of the element to the end of the collection | |
161 void GrowableCache::append(GrowableElement* e) { | |
162 GrowableElement *new_e = e->clone(); | |
163 _elements->append(new_e); | |
164 recache(); | |
165 } | |
166 | |
167 // insert a copy of the element using lessthan() | |
168 void GrowableCache::insert(GrowableElement* e) { | |
169 GrowableElement *new_e = e->clone(); | |
170 _elements->append(new_e); | |
171 | |
172 int n = length()-2; | |
173 for (int i=n; i>=0; i--) { | |
174 GrowableElement *e1 = _elements->at(i); | |
175 GrowableElement *e2 = _elements->at(i+1); | |
176 if (e2->lessThan(e1)) { | |
177 _elements->at_put(i+1, e1); | |
178 _elements->at_put(i, e2); | |
179 } | |
180 } | |
181 | |
182 recache(); | |
183 } | |
184 | |
185 // remove the element at index | |
186 void GrowableCache::remove (int index) { | |
187 GrowableElement *e = _elements->at(index); | |
188 assert(e != NULL, "e != NULL"); | |
189 _elements->remove(e); | |
190 delete e; | |
191 recache(); | |
192 } | |
193 | |
194 // clear out all elements, release all heap space and | |
195 // let our listener know that things have changed. | |
196 void GrowableCache::clear() { | |
197 int len = _elements->length(); | |
198 for (int i=0; i<len; i++) { | |
199 delete _elements->at(i); | |
200 } | |
201 _elements->clear(); | |
202 recache(); | |
203 } | |
204 | |
205 void GrowableCache::oops_do(OopClosure* f) { | |
206 int len = _elements->length(); | |
207 for (int i=0; i<len; i++) { | |
208 GrowableElement *e = _elements->at(i); | |
209 e->oops_do(f); | |
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210 } |
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211 } |
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212 |
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213 void GrowableCache::metadata_do(void f(Metadata*)) { |
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214 int len = _elements->length(); |
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215 for (int i=0; i<len; i++) { |
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216 GrowableElement *e = _elements->at(i); |
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217 e->metadata_do(f); |
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218 } |
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219 } |
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220 |
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221 void GrowableCache::gc_epilogue() { |
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222 int len = _elements->length(); |
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223 for (int i=0; i<len; i++) { |
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224 _cache[i] = _elements->at(i)->getCacheValue(); |
0 | 225 } |
226 } | |
227 | |
228 // | |
229 // class JvmtiBreakpoint | |
230 // | |
231 | |
232 JvmtiBreakpoint::JvmtiBreakpoint() { | |
233 _method = NULL; | |
234 _bci = 0; | |
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235 _class_holder = NULL; |
0 | 236 } |
237 | |
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238 JvmtiBreakpoint::JvmtiBreakpoint(Method* m_method, jlocation location) { |
0 | 239 _method = m_method; |
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240 _class_holder = _method->method_holder()->klass_holder(); |
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241 #ifdef CHECK_UNHANDLED_OOPS |
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242 // _class_holder can't be wrapped in a Handle, because JvmtiBreakpoints are |
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243 // sometimes allocated on the heap. |
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244 // |
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245 // The code handling JvmtiBreakpoints allocated on the stack can't be |
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246 // interrupted by a GC until _class_holder is reachable by the GC via the |
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247 // oops_do method. |
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248 Thread::current()->allow_unhandled_oop(&_class_holder); |
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249 #endif // CHECK_UNHANDLED_OOPS |
0 | 250 assert(_method != NULL, "_method != NULL"); |
251 _bci = (int) location; | |
252 assert(_bci >= 0, "_bci >= 0"); | |
253 } | |
254 | |
255 void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { | |
256 _method = bp._method; | |
257 _bci = bp._bci; | |
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258 _class_holder = bp._class_holder; |
0 | 259 } |
260 | |
261 bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { | |
262 Unimplemented(); | |
263 return false; | |
264 } | |
265 | |
266 bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { | |
267 return _method == bp._method | |
268 && _bci == bp._bci; | |
269 } | |
270 | |
271 bool JvmtiBreakpoint::is_valid() { | |
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272 // class loader can be NULL |
0 | 273 return _method != NULL && |
274 _bci >= 0; | |
275 } | |
276 | |
277 address JvmtiBreakpoint::getBcp() { | |
278 return _method->bcp_from(_bci); | |
279 } | |
280 | |
281 void JvmtiBreakpoint::each_method_version_do(method_action meth_act) { | |
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282 ((Method*)_method->*meth_act)(_bci); |
0 | 283 |
284 // add/remove breakpoint to/from versions of the method that | |
285 // are EMCP. Directly or transitively obsolete methods are | |
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286 // not saved in the PreviousVersionNodes. |
0 | 287 Thread *thread = Thread::current(); |
288 instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder()); | |
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289 Symbol* m_name = _method->name(); |
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290 Symbol* m_signature = _method->signature(); |
0 | 291 |
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292 // search previous versions if they exist |
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293 PreviousVersionWalker pvw(thread, (InstanceKlass *)ikh()); |
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294 for (PreviousVersionNode * pv_node = pvw.next_previous_version(); |
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295 pv_node != NULL; pv_node = pvw.next_previous_version()) { |
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296 GrowableArray<Method*>* methods = pv_node->prev_EMCP_methods(); |
0 | 297 |
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298 if (methods == NULL) { |
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299 // We have run into a PreviousVersion generation where |
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300 // all methods were made obsolete during that generation's |
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301 // RedefineClasses() operation. At the time of that |
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302 // operation, all EMCP methods were flushed so we don't |
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303 // have to go back any further. |
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304 // |
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305 // A NULL methods array is different than an empty methods |
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306 // array. We cannot infer any optimizations about older |
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307 // generations from an empty methods array for the current |
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308 // generation. |
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309 break; |
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310 } |
0 | 311 |
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312 for (int i = methods->length() - 1; i >= 0; i--) { |
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313 Method* method = methods->at(i); |
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314 // obsolete methods that are running are not deleted from |
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315 // previous version array, but they are skipped here. |
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316 if (!method->is_obsolete() && |
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317 method->name() == m_name && |
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318 method->signature() == m_signature) { |
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319 RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", |
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320 meth_act == &Method::set_breakpoint ? "sett" : "clear", |
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321 method->name()->as_C_string(), |
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322 method->signature()->as_C_string())); |
0 | 323 |
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324 (method->*meth_act)(_bci); |
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325 break; |
0 | 326 } |
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327 } |
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328 } |
0 | 329 } |
330 | |
331 void JvmtiBreakpoint::set() { | |
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332 each_method_version_do(&Method::set_breakpoint); |
0 | 333 } |
334 | |
335 void JvmtiBreakpoint::clear() { | |
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336 each_method_version_do(&Method::clear_breakpoint); |
0 | 337 } |
338 | |
339 void JvmtiBreakpoint::print() { | |
340 #ifndef PRODUCT | |
341 const char *class_name = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string(); | |
342 const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string(); | |
343 | |
344 tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp()); | |
345 #endif | |
346 } | |
347 | |
348 | |
349 // | |
350 // class VM_ChangeBreakpoints | |
351 // | |
352 // Modify the Breakpoints data structure at a safepoint | |
353 // | |
354 | |
355 void VM_ChangeBreakpoints::doit() { | |
356 switch (_operation) { | |
357 case SET_BREAKPOINT: | |
358 _breakpoints->set_at_safepoint(*_bp); | |
359 break; | |
360 case CLEAR_BREAKPOINT: | |
361 _breakpoints->clear_at_safepoint(*_bp); | |
362 break; | |
363 default: | |
364 assert(false, "Unknown operation"); | |
365 } | |
366 } | |
367 | |
368 void VM_ChangeBreakpoints::oops_do(OopClosure* f) { | |
10405 | 369 // The JvmtiBreakpoints in _breakpoints will be visited via |
370 // JvmtiExport::oops_do. | |
0 | 371 if (_bp != NULL) { |
372 _bp->oops_do(f); | |
373 } | |
374 } | |
375 | |
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376 void VM_ChangeBreakpoints::metadata_do(void f(Metadata*)) { |
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377 // Walk metadata in breakpoints to keep from being deallocated with RedefineClasses |
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378 if (_bp != NULL) { |
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379 _bp->metadata_do(f); |
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380 } |
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381 } |
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382 |
0 | 383 // |
384 // class JvmtiBreakpoints | |
385 // | |
386 // a JVMTI internal collection of JvmtiBreakpoint | |
387 // | |
388 | |
389 JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { | |
390 _bps.initialize(this,listener_fun); | |
391 } | |
392 | |
393 JvmtiBreakpoints:: ~JvmtiBreakpoints() {} | |
394 | |
395 void JvmtiBreakpoints::oops_do(OopClosure* f) { | |
396 _bps.oops_do(f); | |
397 } | |
398 | |
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399 void JvmtiBreakpoints::metadata_do(void f(Metadata*)) { |
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400 _bps.metadata_do(f); |
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401 } |
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402 |
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403 void JvmtiBreakpoints::gc_epilogue() { |
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404 _bps.gc_epilogue(); |
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405 } |
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406 |
0 | 407 void JvmtiBreakpoints::print() { |
408 #ifndef PRODUCT | |
409 ResourceMark rm; | |
410 | |
411 int n = _bps.length(); | |
412 for (int i=0; i<n; i++) { | |
413 JvmtiBreakpoint& bp = _bps.at(i); | |
414 tty->print("%d: ", i); | |
415 bp.print(); | |
416 tty->print_cr(""); | |
417 } | |
418 #endif | |
419 } | |
420 | |
421 | |
422 void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { | |
423 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
424 | |
425 int i = _bps.find(bp); | |
426 if (i == -1) { | |
427 _bps.append(bp); | |
428 bp.set(); | |
429 } | |
430 } | |
431 | |
432 void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { | |
433 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
434 | |
435 int i = _bps.find(bp); | |
436 if (i != -1) { | |
437 _bps.remove(i); | |
438 bp.clear(); | |
439 } | |
440 } | |
441 | |
442 int JvmtiBreakpoints::length() { return _bps.length(); } | |
443 | |
444 int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { | |
445 if ( _bps.find(bp) != -1) { | |
446 return JVMTI_ERROR_DUPLICATE; | |
447 } | |
10405 | 448 VM_ChangeBreakpoints set_breakpoint(VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); |
0 | 449 VMThread::execute(&set_breakpoint); |
450 return JVMTI_ERROR_NONE; | |
451 } | |
452 | |
453 int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { | |
454 if ( _bps.find(bp) == -1) { | |
455 return JVMTI_ERROR_NOT_FOUND; | |
456 } | |
457 | |
10405 | 458 VM_ChangeBreakpoints clear_breakpoint(VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); |
0 | 459 VMThread::execute(&clear_breakpoint); |
460 return JVMTI_ERROR_NONE; | |
461 } | |
462 | |
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463 void JvmtiBreakpoints::clearall_in_class_at_safepoint(Klass* klass) { |
0 | 464 bool changed = true; |
465 // We are going to run thru the list of bkpts | |
466 // and delete some. This deletion probably alters | |
467 // the list in some implementation defined way such | |
468 // that when we delete entry i, the next entry might | |
469 // no longer be at i+1. To be safe, each time we delete | |
470 // an entry, we'll just start again from the beginning. | |
471 // We'll stop when we make a pass thru the whole list without | |
472 // deleting anything. | |
473 while (changed) { | |
474 int len = _bps.length(); | |
475 changed = false; | |
476 for (int i = 0; i < len; i++) { | |
477 JvmtiBreakpoint& bp = _bps.at(i); | |
478 if (bp.method()->method_holder() == klass) { | |
479 bp.clear(); | |
480 _bps.remove(i); | |
481 // This changed 'i' so we have to start over. | |
482 changed = true; | |
483 break; | |
484 } | |
485 } | |
486 } | |
487 } | |
488 | |
489 // | |
490 // class JvmtiCurrentBreakpoints | |
491 // | |
492 | |
493 JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints = NULL; | |
494 address * JvmtiCurrentBreakpoints::_breakpoint_list = NULL; | |
495 | |
496 | |
497 JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() { | |
498 if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints); | |
499 _jvmti_breakpoints = new JvmtiBreakpoints(listener_fun); | |
500 assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL"); | |
501 return (*_jvmti_breakpoints); | |
502 } | |
503 | |
504 void JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) { | |
505 JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj; | |
506 assert(this_jvmti != NULL, "this_jvmti != NULL"); | |
507 | |
508 debug_only(int n = this_jvmti->length();); | |
509 assert(cache[n] == NULL, "cache must be NULL terminated"); | |
510 | |
511 set_breakpoint_list(cache); | |
512 } | |
513 | |
514 | |
515 void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) { | |
516 if (_jvmti_breakpoints != NULL) { | |
517 _jvmti_breakpoints->oops_do(f); | |
518 } | |
519 } | |
520 | |
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521 void JvmtiCurrentBreakpoints::metadata_do(void f(Metadata*)) { |
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522 if (_jvmti_breakpoints != NULL) { |
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523 _jvmti_breakpoints->metadata_do(f); |
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524 } |
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525 } |
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526 |
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527 void JvmtiCurrentBreakpoints::gc_epilogue() { |
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528 if (_jvmti_breakpoints != NULL) { |
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529 _jvmti_breakpoints->gc_epilogue(); |
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530 } |
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531 } |
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532 |
0 | 533 /////////////////////////////////////////////////////////////// |
534 // | |
535 // class VM_GetOrSetLocal | |
536 // | |
537 | |
538 // Constructor for non-object getter | |
539 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) | |
540 : _thread(thread) | |
541 , _calling_thread(NULL) | |
542 , _depth(depth) | |
543 , _index(index) | |
544 , _type(type) | |
545 , _set(false) | |
546 , _jvf(NULL) | |
547 , _result(JVMTI_ERROR_NONE) | |
548 { | |
549 } | |
550 | |
551 // Constructor for object or non-object setter | |
552 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) | |
553 : _thread(thread) | |
554 , _calling_thread(NULL) | |
555 , _depth(depth) | |
556 , _index(index) | |
557 , _type(type) | |
558 , _value(value) | |
559 , _set(true) | |
560 , _jvf(NULL) | |
561 , _result(JVMTI_ERROR_NONE) | |
562 { | |
563 } | |
564 | |
565 // Constructor for object getter | |
566 VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) | |
567 : _thread(thread) | |
568 , _calling_thread(calling_thread) | |
569 , _depth(depth) | |
570 , _index(index) | |
571 , _type(T_OBJECT) | |
572 , _set(false) | |
573 , _jvf(NULL) | |
574 , _result(JVMTI_ERROR_NONE) | |
575 { | |
576 } | |
577 | |
578 vframe *VM_GetOrSetLocal::get_vframe() { | |
579 if (!_thread->has_last_Java_frame()) { | |
580 return NULL; | |
581 } | |
582 RegisterMap reg_map(_thread); | |
583 vframe *vf = _thread->last_java_vframe(®_map); | |
584 int d = 0; | |
585 while ((vf != NULL) && (d < _depth)) { | |
586 vf = vf->java_sender(); | |
587 d++; | |
588 } | |
589 return vf; | |
590 } | |
591 | |
592 javaVFrame *VM_GetOrSetLocal::get_java_vframe() { | |
593 vframe* vf = get_vframe(); | |
594 if (vf == NULL) { | |
595 _result = JVMTI_ERROR_NO_MORE_FRAMES; | |
596 return NULL; | |
597 } | |
598 javaVFrame *jvf = (javaVFrame*)vf; | |
599 | |
2019 | 600 if (!vf->is_java_frame()) { |
0 | 601 _result = JVMTI_ERROR_OPAQUE_FRAME; |
602 return NULL; | |
603 } | |
604 return jvf; | |
605 } | |
606 | |
607 // Check that the klass is assignable to a type with the given signature. | |
608 // Another solution could be to use the function Klass::is_subtype_of(type). | |
609 // But the type class can be forced to load/initialize eagerly in such a case. | |
610 // This may cause unexpected consequences like CFLH or class-init JVMTI events. | |
611 // It is better to avoid such a behavior. | |
612 bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { | |
613 assert(ty_sign != NULL, "type signature must not be NULL"); | |
614 assert(thread != NULL, "thread must not be NULL"); | |
615 assert(klass != NULL, "klass must not be NULL"); | |
616 | |
617 int len = (int) strlen(ty_sign); | |
618 if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name | |
619 ty_sign++; | |
620 len -= 2; | |
621 } | |
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622 TempNewSymbol ty_sym = SymbolTable::new_symbol(ty_sign, len, thread); |
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623 if (klass->name() == ty_sym) { |
0 | 624 return true; |
625 } | |
626 // Compare primary supers | |
627 int super_depth = klass->super_depth(); | |
628 int idx; | |
629 for (idx = 0; idx < super_depth; idx++) { | |
6983 | 630 if (klass->primary_super_of_depth(idx)->name() == ty_sym) { |
0 | 631 return true; |
632 } | |
633 } | |
634 // Compare secondary supers | |
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635 Array<Klass*>* sec_supers = klass->secondary_supers(); |
0 | 636 for (idx = 0; idx < sec_supers->length(); idx++) { |
6983 | 637 if (((Klass*) sec_supers->at(idx))->name() == ty_sym) { |
0 | 638 return true; |
639 } | |
640 } | |
641 return false; | |
642 } | |
643 | |
644 // Checks error conditions: | |
645 // JVMTI_ERROR_INVALID_SLOT | |
646 // JVMTI_ERROR_TYPE_MISMATCH | |
647 // Returns: 'true' - everything is Ok, 'false' - error code | |
648 | |
649 bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { | |
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650 Method* method_oop = jvf->method(); |
0 | 651 if (!method_oop->has_localvariable_table()) { |
652 // Just to check index boundaries | |
653 jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; | |
654 if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { | |
655 _result = JVMTI_ERROR_INVALID_SLOT; | |
656 return false; | |
657 } | |
658 return true; | |
659 } | |
660 | |
661 jint num_entries = method_oop->localvariable_table_length(); | |
662 if (num_entries == 0) { | |
663 _result = JVMTI_ERROR_INVALID_SLOT; | |
664 return false; // There are no slots | |
665 } | |
666 int signature_idx = -1; | |
667 int vf_bci = jvf->bci(); | |
668 LocalVariableTableElement* table = method_oop->localvariable_table_start(); | |
669 for (int i = 0; i < num_entries; i++) { | |
670 int start_bci = table[i].start_bci; | |
671 int end_bci = start_bci + table[i].length; | |
672 | |
673 // Here we assume that locations of LVT entries | |
674 // with the same slot number cannot be overlapped | |
675 if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { | |
676 signature_idx = (int) table[i].descriptor_cp_index; | |
677 break; | |
678 } | |
679 } | |
680 if (signature_idx == -1) { | |
681 _result = JVMTI_ERROR_INVALID_SLOT; | |
682 return false; // Incorrect slot index | |
683 } | |
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684 Symbol* sign_sym = method_oop->constants()->symbol_at(signature_idx); |
0 | 685 const char* signature = (const char *) sign_sym->as_utf8(); |
686 BasicType slot_type = char2type(signature[0]); | |
687 | |
688 switch (slot_type) { | |
689 case T_BYTE: | |
690 case T_SHORT: | |
691 case T_CHAR: | |
692 case T_BOOLEAN: | |
693 slot_type = T_INT; | |
694 break; | |
695 case T_ARRAY: | |
696 slot_type = T_OBJECT; | |
697 break; | |
698 }; | |
699 if (_type != slot_type) { | |
700 _result = JVMTI_ERROR_TYPE_MISMATCH; | |
701 return false; | |
702 } | |
703 | |
704 jobject jobj = _value.l; | |
705 if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed | |
706 // Check that the jobject class matches the return type signature. | |
707 JavaThread* cur_thread = JavaThread::current(); | |
708 HandleMark hm(cur_thread); | |
709 | |
710 Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); | |
711 NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
712 KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); | |
713 NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); | |
714 | |
6983 | 715 if (!is_assignable(signature, ob_kh(), cur_thread)) { |
0 | 716 _result = JVMTI_ERROR_TYPE_MISMATCH; |
717 return false; | |
718 } | |
719 } | |
720 return true; | |
721 } | |
722 | |
723 static bool can_be_deoptimized(vframe* vf) { | |
724 return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); | |
725 } | |
726 | |
727 bool VM_GetOrSetLocal::doit_prologue() { | |
728 _jvf = get_java_vframe(); | |
729 NULL_CHECK(_jvf, false); | |
730 | |
2019 | 731 if (_jvf->method()->is_native()) { |
732 if (getting_receiver() && !_jvf->method()->is_static()) { | |
733 return true; | |
734 } else { | |
735 _result = JVMTI_ERROR_OPAQUE_FRAME; | |
736 return false; | |
737 } | |
738 } | |
739 | |
0 | 740 if (!check_slot_type(_jvf)) { |
741 return false; | |
742 } | |
743 return true; | |
744 } | |
745 | |
746 void VM_GetOrSetLocal::doit() { | |
747 if (_set) { | |
748 // Force deoptimization of frame if compiled because it's | |
749 // possible the compiler emitted some locals as constant values, | |
750 // meaning they are not mutable. | |
751 if (can_be_deoptimized(_jvf)) { | |
752 | |
753 // Schedule deoptimization so that eventually the local | |
754 // update will be written to an interpreter frame. | |
1905
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755 Deoptimization::deoptimize_frame(_jvf->thread(), _jvf->fr().id()); |
0 | 756 |
757 // Now store a new value for the local which will be applied | |
758 // once deoptimization occurs. Note however that while this | |
759 // write is deferred until deoptimization actually happens | |
760 // can vframe created after this point will have its locals | |
761 // reflecting this update so as far as anyone can see the | |
762 // write has already taken place. | |
763 | |
764 // If we are updating an oop then get the oop from the handle | |
765 // since the handle will be long gone by the time the deopt | |
766 // happens. The oop stored in the deferred local will be | |
767 // gc'd on its own. | |
768 if (_type == T_OBJECT) { | |
769 _value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); | |
770 } | |
771 // Re-read the vframe so we can see that it is deoptimized | |
772 // [ Only need because of assert in update_local() ] | |
773 _jvf = get_java_vframe(); | |
774 ((compiledVFrame*)_jvf)->update_local(_type, _index, _value); | |
775 return; | |
776 } | |
777 StackValueCollection *locals = _jvf->locals(); | |
778 HandleMark hm; | |
779 | |
780 switch (_type) { | |
2019 | 781 case T_INT: locals->set_int_at (_index, _value.i); break; |
782 case T_LONG: locals->set_long_at (_index, _value.j); break; | |
783 case T_FLOAT: locals->set_float_at (_index, _value.f); break; | |
784 case T_DOUBLE: locals->set_double_at(_index, _value.d); break; | |
785 case T_OBJECT: { | |
786 Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); | |
787 locals->set_obj_at (_index, ob_h); | |
788 break; | |
789 } | |
790 default: ShouldNotReachHere(); | |
0 | 791 } |
792 _jvf->set_locals(locals); | |
793 } else { | |
2019 | 794 if (_jvf->method()->is_native() && _jvf->is_compiled_frame()) { |
795 assert(getting_receiver(), "Can only get here when getting receiver"); | |
796 oop receiver = _jvf->fr().get_native_receiver(); | |
797 _value.l = JNIHandles::make_local(_calling_thread, receiver); | |
798 } else { | |
799 StackValueCollection *locals = _jvf->locals(); | |
0 | 800 |
2019 | 801 if (locals->at(_index)->type() == T_CONFLICT) { |
802 memset(&_value, 0, sizeof(_value)); | |
803 _value.l = NULL; | |
804 return; | |
805 } | |
0 | 806 |
2019 | 807 switch (_type) { |
808 case T_INT: _value.i = locals->int_at (_index); break; | |
809 case T_LONG: _value.j = locals->long_at (_index); break; | |
810 case T_FLOAT: _value.f = locals->float_at (_index); break; | |
811 case T_DOUBLE: _value.d = locals->double_at(_index); break; | |
812 case T_OBJECT: { | |
813 // Wrap the oop to be returned in a local JNI handle since | |
814 // oops_do() no longer applies after doit() is finished. | |
815 oop obj = locals->obj_at(_index)(); | |
816 _value.l = JNIHandles::make_local(_calling_thread, obj); | |
817 break; | |
818 } | |
819 default: ShouldNotReachHere(); | |
820 } | |
0 | 821 } |
822 } | |
823 } | |
824 | |
825 | |
826 bool VM_GetOrSetLocal::allow_nested_vm_operations() const { | |
827 return true; // May need to deoptimize | |
828 } | |
829 | |
830 | |
2019 | 831 VM_GetReceiver::VM_GetReceiver( |
832 JavaThread* thread, JavaThread* caller_thread, jint depth) | |
833 : VM_GetOrSetLocal(thread, caller_thread, depth, 0) {} | |
834 | |
0 | 835 ///////////////////////////////////////////////////////////////////////////////////////// |
836 | |
837 // | |
838 // class JvmtiSuspendControl - see comments in jvmtiImpl.hpp | |
839 // | |
840 | |
841 bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { | |
842 // external suspend should have caught suspending a thread twice | |
843 | |
844 // Immediate suspension required for JPDA back-end so JVMTI agent threads do | |
845 // not deadlock due to later suspension on transitions while holding | |
846 // raw monitors. Passing true causes the immediate suspension. | |
847 // java_suspend() will catch threads in the process of exiting | |
848 // and will ignore them. | |
849 java_thread->java_suspend(); | |
850 | |
851 // It would be nice to have the following assertion in all the time, | |
852 // but it is possible for a racing resume request to have resumed | |
853 // this thread right after we suspended it. Temporarily enable this | |
854 // assertion if you are chasing a different kind of bug. | |
855 // | |
856 // assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || | |
857 // java_thread->is_being_ext_suspended(), "thread is not suspended"); | |
858 | |
859 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { | |
860 // check again because we can get delayed in java_suspend(): | |
861 // the thread is in process of exiting. | |
862 return false; | |
863 } | |
864 | |
865 return true; | |
866 } | |
867 | |
868 bool JvmtiSuspendControl::resume(JavaThread *java_thread) { | |
869 // external suspend should have caught resuming a thread twice | |
870 assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); | |
871 | |
872 // resume thread | |
873 { | |
874 // must always grab Threads_lock, see JVM_SuspendThread | |
875 MutexLocker ml(Threads_lock); | |
876 java_thread->java_resume(); | |
877 } | |
878 | |
879 return true; | |
880 } | |
881 | |
882 | |
883 void JvmtiSuspendControl::print() { | |
884 #ifndef PRODUCT | |
885 MutexLocker mu(Threads_lock); | |
886 ResourceMark rm; | |
887 | |
888 tty->print("Suspended Threads: ["); | |
889 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { | |
8721 | 890 #ifdef JVMTI_TRACE |
0 | 891 const char *name = JvmtiTrace::safe_get_thread_name(thread); |
892 #else | |
893 const char *name = ""; | |
894 #endif /*JVMTI_TRACE */ | |
895 tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); | |
896 if (!thread->has_last_Java_frame()) { | |
897 tty->print("no stack"); | |
898 } | |
899 tty->print(") "); | |
900 } | |
901 tty->print_cr("]"); | |
902 #endif | |
903 } | |
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904 |
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905 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_load_event( |
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906 nmethod* nm) { |
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907 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_LOAD); |
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908 event._event_data.compiled_method_load = nm; |
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909 // Keep the nmethod alive until the ServiceThread can process |
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910 // this deferred event. |
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911 nmethodLocker::lock_nmethod(nm); |
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912 return event; |
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913 } |
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914 |
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915 JvmtiDeferredEvent JvmtiDeferredEvent::compiled_method_unload_event( |
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916 nmethod* nm, jmethodID id, const void* code) { |
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917 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_COMPILED_METHOD_UNLOAD); |
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918 event._event_data.compiled_method_unload.nm = nm; |
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919 event._event_data.compiled_method_unload.method_id = id; |
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920 event._event_data.compiled_method_unload.code_begin = code; |
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921 // Keep the nmethod alive until the ServiceThread can process |
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922 // this deferred event. This will keep the memory for the |
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923 // generated code from being reused too early. We pass |
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924 // zombie_ok == true here so that our nmethod that was just |
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925 // made into a zombie can be locked. |
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926 nmethodLocker::lock_nmethod(nm, true /* zombie_ok */); |
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927 return event; |
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928 } |
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929 |
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930 JvmtiDeferredEvent JvmtiDeferredEvent::dynamic_code_generated_event( |
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931 const char* name, const void* code_begin, const void* code_end) { |
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932 JvmtiDeferredEvent event = JvmtiDeferredEvent(TYPE_DYNAMIC_CODE_GENERATED); |
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933 // Need to make a copy of the name since we don't know how long |
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934 // the event poster will keep it around after we enqueue the |
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935 // deferred event and return. strdup() failure is handled in |
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936 // the post() routine below. |
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937 event._event_data.dynamic_code_generated.name = os::strdup(name); |
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938 event._event_data.dynamic_code_generated.code_begin = code_begin; |
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939 event._event_data.dynamic_code_generated.code_end = code_end; |
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940 return event; |
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941 } |
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942 |
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943 void JvmtiDeferredEvent::post() { |
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944 assert(ServiceThread::is_service_thread(Thread::current()), |
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945 "Service thread must post enqueued events"); |
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946 switch(_type) { |
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947 case TYPE_COMPILED_METHOD_LOAD: { |
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948 nmethod* nm = _event_data.compiled_method_load; |
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949 JvmtiExport::post_compiled_method_load(nm); |
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950 // done with the deferred event so unlock the nmethod |
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951 nmethodLocker::unlock_nmethod(nm); |
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952 break; |
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953 } |
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954 case TYPE_COMPILED_METHOD_UNLOAD: { |
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955 nmethod* nm = _event_data.compiled_method_unload.nm; |
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956 JvmtiExport::post_compiled_method_unload( |
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957 _event_data.compiled_method_unload.method_id, |
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958 _event_data.compiled_method_unload.code_begin); |
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959 // done with the deferred event so unlock the nmethod |
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960 nmethodLocker::unlock_nmethod(nm); |
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961 break; |
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962 } |
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963 case TYPE_DYNAMIC_CODE_GENERATED: { |
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964 JvmtiExport::post_dynamic_code_generated_internal( |
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965 // if strdup failed give the event a default name |
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966 (_event_data.dynamic_code_generated.name == NULL) |
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967 ? "unknown_code" : _event_data.dynamic_code_generated.name, |
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968 _event_data.dynamic_code_generated.code_begin, |
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969 _event_data.dynamic_code_generated.code_end); |
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970 if (_event_data.dynamic_code_generated.name != NULL) { |
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971 // release our copy |
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972 os::free((void *)_event_data.dynamic_code_generated.name); |
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973 } |
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974 break; |
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975 } |
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976 default: |
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977 ShouldNotReachHere(); |
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978 } |
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979 } |
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980 |
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981 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_tail = NULL; |
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982 JvmtiDeferredEventQueue::QueueNode* JvmtiDeferredEventQueue::_queue_head = NULL; |
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983 |
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984 volatile JvmtiDeferredEventQueue::QueueNode* |
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985 JvmtiDeferredEventQueue::_pending_list = NULL; |
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986 |
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987 bool JvmtiDeferredEventQueue::has_events() { |
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988 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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989 return _queue_head != NULL || _pending_list != NULL; |
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990 } |
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991 |
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992 void JvmtiDeferredEventQueue::enqueue(const JvmtiDeferredEvent& event) { |
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993 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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994 |
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995 process_pending_events(); |
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996 |
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997 // Events get added to the end of the queue (and are pulled off the front). |
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998 QueueNode* node = new QueueNode(event); |
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999 if (_queue_tail == NULL) { |
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1000 _queue_tail = _queue_head = node; |
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1001 } else { |
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1002 assert(_queue_tail->next() == NULL, "Must be the last element in the list"); |
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1003 _queue_tail->set_next(node); |
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1004 _queue_tail = node; |
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1005 } |
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1006 |
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1007 Service_lock->notify_all(); |
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1008 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1009 "Inconsistent queue markers"); |
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1010 } |
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1011 |
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1012 JvmtiDeferredEvent JvmtiDeferredEventQueue::dequeue() { |
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1013 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1014 |
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1015 process_pending_events(); |
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1016 |
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1017 assert(_queue_head != NULL, "Nothing to dequeue"); |
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1018 |
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1019 if (_queue_head == NULL) { |
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1020 // Just in case this happens in product; it shouldn't but let's not crash |
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1021 return JvmtiDeferredEvent(); |
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1022 } |
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1023 |
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1024 QueueNode* node = _queue_head; |
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1025 _queue_head = _queue_head->next(); |
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1026 if (_queue_head == NULL) { |
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1027 _queue_tail = NULL; |
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1028 } |
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1029 |
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1030 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1031 "Inconsistent queue markers"); |
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1032 |
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1033 JvmtiDeferredEvent event = node->event(); |
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1034 delete node; |
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1035 return event; |
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1036 } |
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1037 |
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1038 void JvmtiDeferredEventQueue::add_pending_event( |
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1039 const JvmtiDeferredEvent& event) { |
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1040 |
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1041 QueueNode* node = new QueueNode(event); |
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1042 |
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1043 bool success = false; |
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1044 QueueNode* prev_value = (QueueNode*)_pending_list; |
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1045 do { |
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1046 node->set_next(prev_value); |
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1047 prev_value = (QueueNode*)Atomic::cmpxchg_ptr( |
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1048 (void*)node, (volatile void*)&_pending_list, (void*)node->next()); |
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1049 } while (prev_value != node->next()); |
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1050 } |
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1051 |
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1052 // This method transfers any events that were added by someone NOT holding |
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1053 // the lock into the mainline queue. |
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1054 void JvmtiDeferredEventQueue::process_pending_events() { |
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1055 assert(Service_lock->owned_by_self(), "Must own Service_lock"); |
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1056 |
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1057 if (_pending_list != NULL) { |
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1058 QueueNode* head = |
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1059 (QueueNode*)Atomic::xchg_ptr(NULL, (volatile void*)&_pending_list); |
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1060 |
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1061 assert((_queue_head == NULL) == (_queue_tail == NULL), |
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1062 "Inconsistent queue markers"); |
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1063 |
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1064 if (head != NULL) { |
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1065 // Since we've treated the pending list as a stack (with newer |
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1066 // events at the beginning), we need to join the bottom of the stack |
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1067 // with the 'tail' of the queue in order to get the events in the |
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1068 // right order. We do this by reversing the pending list and appending |
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1069 // it to the queue. |
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1070 |
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1071 QueueNode* new_tail = head; |
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1072 QueueNode* new_head = NULL; |
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1073 |
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1074 // This reverses the list |
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1075 QueueNode* prev = new_tail; |
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1076 QueueNode* node = new_tail->next(); |
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1077 new_tail->set_next(NULL); |
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1078 while (node != NULL) { |
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1079 QueueNode* next = node->next(); |
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1080 node->set_next(prev); |
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1081 prev = node; |
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1082 node = next; |
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1083 } |
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1084 new_head = prev; |
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1085 |
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1086 // Now append the new list to the queue |
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1087 if (_queue_tail != NULL) { |
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1088 _queue_tail->set_next(new_head); |
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1089 } else { // _queue_head == NULL |
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1090 _queue_head = new_head; |
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1091 } |
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1092 _queue_tail = new_tail; |
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1093 } |
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1094 } |
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1095 } |