Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiImpl.hpp @ 2904:1916da1d3e11
Merge.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 08 Jun 2011 17:26:49 +0200 |
parents | 46a56fac55c7 |
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0 | 1 /* |
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2 * Copyright (c) 1999, 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 #ifndef SHARE_VM_PRIMS_JVMTIIMPL_HPP |
26 #define SHARE_VM_PRIMS_JVMTIIMPL_HPP | |
27 | |
28 #ifndef JVMTI_KERNEL | |
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29 |
1972 | 30 #include "classfile/systemDictionary.hpp" |
31 #include "jvmtifiles/jvmti.h" | |
32 #include "oops/objArrayOop.hpp" | |
33 #include "prims/jvmtiEnvThreadState.hpp" | |
34 #include "prims/jvmtiEventController.hpp" | |
35 #include "prims/jvmtiTrace.hpp" | |
36 #include "prims/jvmtiUtil.hpp" | |
37 #include "runtime/stackValueCollection.hpp" | |
38 #include "runtime/vm_operations.hpp" | |
39 | |
0 | 40 // |
41 // Forward Declarations | |
42 // | |
43 | |
44 class JvmtiBreakpoint; | |
45 class JvmtiBreakpoints; | |
46 | |
47 | |
48 /////////////////////////////////////////////////////////////// | |
49 // | |
50 // class GrowableCache, GrowableElement | |
51 // Used by : JvmtiBreakpointCache | |
52 // Used by JVMTI methods: none directly. | |
53 // | |
54 // GrowableCache is a permanent CHeap growable array of <GrowableElement *> | |
55 // | |
56 // In addition, the GrowableCache maintains a NULL terminated cache array of type address | |
57 // that's created from the element array using the function: | |
58 // address GrowableElement::getCacheValue(). | |
59 // | |
60 // Whenever the GrowableArray changes size, the cache array gets recomputed into a new C_HEAP allocated | |
61 // block of memory. Additionally, every time the cache changes its position in memory, the | |
62 // void (*_listener_fun)(void *this_obj, address* cache) | |
63 // gets called with the cache's new address. This gives the user of the GrowableCache a callback | |
64 // to update its pointer to the address cache. | |
65 // | |
66 | |
67 class GrowableElement : public CHeapObj { | |
68 public: | |
69 virtual address getCacheValue() =0; | |
70 virtual bool equals(GrowableElement* e) =0; | |
71 virtual bool lessThan(GrowableElement *e)=0; | |
72 virtual GrowableElement *clone() =0; | |
73 virtual void oops_do(OopClosure* f) =0; | |
74 }; | |
75 | |
76 class GrowableCache VALUE_OBJ_CLASS_SPEC { | |
77 | |
78 private: | |
79 // Object pointer passed into cache & listener functions. | |
80 void *_this_obj; | |
81 | |
82 // Array of elements in the collection | |
83 GrowableArray<GrowableElement *> *_elements; | |
84 | |
85 // Parallel array of cached values | |
86 address *_cache; | |
87 | |
88 // Listener for changes to the _cache field. | |
89 // Called whenever the _cache field has it's value changed | |
90 // (but NOT when cached elements are recomputed). | |
91 void (*_listener_fun)(void *, address*); | |
92 | |
93 static bool equals(void *, GrowableElement *); | |
94 | |
95 // recache all elements after size change, notify listener | |
96 void recache(); | |
97 | |
98 public: | |
99 GrowableCache(); | |
100 ~GrowableCache(); | |
101 | |
102 void initialize(void *this_obj, void listener_fun(void *, address*) ); | |
103 | |
104 // number of elements in the collection | |
105 int length(); | |
106 // get the value of the index element in the collection | |
107 GrowableElement* at(int index); | |
108 // find the index of the element, -1 if it doesn't exist | |
109 int find(GrowableElement* e); | |
110 // append a copy of the element to the end of the collection, notify listener | |
111 void append(GrowableElement* e); | |
112 // insert a copy of the element using lessthan(), notify listener | |
113 void insert(GrowableElement* e); | |
114 // remove the element at index, notify listener | |
115 void remove (int index); | |
116 // clear out all elements and release all heap space, notify listener | |
117 void clear(); | |
118 // apply f to every element and update the cache | |
119 void oops_do(OopClosure* f); | |
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120 // update the cache after a full gc |
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121 void gc_epilogue(); |
0 | 122 }; |
123 | |
124 | |
125 /////////////////////////////////////////////////////////////// | |
126 // | |
127 // class JvmtiBreakpointCache | |
128 // Used by : JvmtiBreakpoints | |
129 // Used by JVMTI methods: none directly. | |
130 // Note : typesafe wrapper for GrowableCache of JvmtiBreakpoint | |
131 // | |
132 | |
133 class JvmtiBreakpointCache : public CHeapObj { | |
134 | |
135 private: | |
136 GrowableCache _cache; | |
137 | |
138 public: | |
139 JvmtiBreakpointCache() {} | |
140 ~JvmtiBreakpointCache() {} | |
141 | |
142 void initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
143 _cache.initialize(this_obj,listener_fun); | |
144 } | |
145 | |
146 int length() { return _cache.length(); } | |
147 JvmtiBreakpoint& at(int index) { return (JvmtiBreakpoint&) *(_cache.at(index)); } | |
148 int find(JvmtiBreakpoint& e) { return _cache.find((GrowableElement *) &e); } | |
149 void append(JvmtiBreakpoint& e) { _cache.append((GrowableElement *) &e); } | |
150 void remove (int index) { _cache.remove(index); } | |
151 void clear() { _cache.clear(); } | |
152 void oops_do(OopClosure* f) { _cache.oops_do(f); } | |
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153 void gc_epilogue() { _cache.gc_epilogue(); } |
0 | 154 }; |
155 | |
156 | |
157 /////////////////////////////////////////////////////////////// | |
158 // | |
159 // class JvmtiBreakpoint | |
160 // Used by : JvmtiBreakpoints | |
161 // Used by JVMTI methods: SetBreakpoint, ClearBreakpoint, ClearAllBreakpoints | |
162 // Note: Extends GrowableElement for use in a GrowableCache | |
163 // | |
164 // A JvmtiBreakpoint describes a location (class, method, bci) to break at. | |
165 // | |
166 | |
167 typedef void (methodOopDesc::*method_action)(int _bci); | |
168 | |
169 class JvmtiBreakpoint : public GrowableElement { | |
170 private: | |
171 methodOop _method; | |
172 int _bci; | |
173 Bytecodes::Code _orig_bytecode; | |
174 | |
175 public: | |
176 JvmtiBreakpoint(); | |
177 JvmtiBreakpoint(methodOop m_method, jlocation location); | |
178 bool equals(JvmtiBreakpoint& bp); | |
179 bool lessThan(JvmtiBreakpoint &bp); | |
180 void copy(JvmtiBreakpoint& bp); | |
181 bool is_valid(); | |
182 address getBcp(); | |
183 void each_method_version_do(method_action meth_act); | |
184 void set(); | |
185 void clear(); | |
186 void print(); | |
187 | |
188 methodOop method() { return _method; } | |
189 | |
190 // GrowableElement implementation | |
191 address getCacheValue() { return getBcp(); } | |
192 bool lessThan(GrowableElement* e) { Unimplemented(); return false; } | |
193 bool equals(GrowableElement* e) { return equals((JvmtiBreakpoint&) *e); } | |
194 void oops_do(OopClosure* f) { f->do_oop((oop *) &_method); } | |
195 GrowableElement *clone() { | |
196 JvmtiBreakpoint *bp = new JvmtiBreakpoint(); | |
197 bp->copy(*this); | |
198 return bp; | |
199 } | |
200 }; | |
201 | |
202 | |
203 /////////////////////////////////////////////////////////////// | |
204 // | |
205 // class VM_ChangeBreakpoints | |
206 // Used by : JvmtiBreakpoints | |
207 // Used by JVMTI methods: none directly. | |
208 // Note: A Helper class. | |
209 // | |
210 // VM_ChangeBreakpoints implements a VM_Operation for ALL modifications to the JvmtiBreakpoints class. | |
211 // | |
212 | |
213 class VM_ChangeBreakpoints : public VM_Operation { | |
214 private: | |
215 JvmtiBreakpoints* _breakpoints; | |
216 int _operation; | |
217 JvmtiBreakpoint* _bp; | |
218 | |
219 public: | |
220 enum { SET_BREAKPOINT=0, CLEAR_BREAKPOINT=1, CLEAR_ALL_BREAKPOINT=2 }; | |
221 | |
222 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation) { | |
223 _breakpoints = breakpoints; | |
224 _bp = NULL; | |
225 _operation = operation; | |
226 assert(breakpoints != NULL, "breakpoints != NULL"); | |
227 assert(operation == CLEAR_ALL_BREAKPOINT, "unknown breakpoint operation"); | |
228 } | |
229 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation, JvmtiBreakpoint *bp) { | |
230 _breakpoints = breakpoints; | |
231 _bp = bp; | |
232 _operation = operation; | |
233 assert(breakpoints != NULL, "breakpoints != NULL"); | |
234 assert(bp != NULL, "bp != NULL"); | |
235 assert(operation == SET_BREAKPOINT || operation == CLEAR_BREAKPOINT , "unknown breakpoint operation"); | |
236 } | |
237 | |
238 VMOp_Type type() const { return VMOp_ChangeBreakpoints; } | |
239 void doit(); | |
240 void oops_do(OopClosure* f); | |
241 }; | |
242 | |
243 | |
244 /////////////////////////////////////////////////////////////// | |
245 // | |
246 // class JvmtiBreakpoints | |
247 // Used by : JvmtiCurrentBreakpoints | |
248 // Used by JVMTI methods: none directly | |
249 // Note: A Helper class | |
250 // | |
251 // JvmtiBreakpoints is a GrowableCache of JvmtiBreakpoint. | |
252 // All changes to the GrowableCache occur at a safepoint using VM_ChangeBreakpoints. | |
253 // | |
254 // Because _bps is only modified at safepoints, its possible to always use the | |
255 // cached byte code pointers from _bps without doing any synchronization (see JvmtiCurrentBreakpoints). | |
256 // | |
257 // It would be possible to make JvmtiBreakpoints a static class, but I've made it | |
258 // CHeap allocated to emphasize its similarity to JvmtiFramePops. | |
259 // | |
260 | |
261 class JvmtiBreakpoints : public CHeapObj { | |
262 private: | |
263 | |
264 JvmtiBreakpointCache _bps; | |
265 | |
266 // These should only be used by VM_ChangeBreakpoints | |
267 // to insure they only occur at safepoints. | |
268 // Todo: add checks for safepoint | |
269 friend class VM_ChangeBreakpoints; | |
270 void set_at_safepoint(JvmtiBreakpoint& bp); | |
271 void clear_at_safepoint(JvmtiBreakpoint& bp); | |
272 void clearall_at_safepoint(); | |
273 | |
274 static void do_element(GrowableElement *e); | |
275 | |
276 public: | |
277 JvmtiBreakpoints(void listener_fun(void *, address *)); | |
278 ~JvmtiBreakpoints(); | |
279 | |
280 int length(); | |
281 void oops_do(OopClosure* f); | |
282 void print(); | |
283 | |
284 int set(JvmtiBreakpoint& bp); | |
285 int clear(JvmtiBreakpoint& bp); | |
286 void clearall_in_class_at_safepoint(klassOop klass); | |
287 void clearall(); | |
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288 void gc_epilogue(); |
0 | 289 }; |
290 | |
291 | |
292 /////////////////////////////////////////////////////////////// | |
293 // | |
294 // class JvmtiCurrentBreakpoints | |
295 // | |
296 // A static wrapper class for the JvmtiBreakpoints that provides: | |
297 // 1. a fast inlined function to check if a byte code pointer is a breakpoint (is_breakpoint). | |
298 // 2. a function for lazily creating the JvmtiBreakpoints class (this is not strictly necessary, | |
299 // but I'm copying the code from JvmtiThreadState which needs to lazily initialize | |
300 // JvmtiFramePops). | |
301 // 3. An oops_do entry point for GC'ing the breakpoint array. | |
302 // | |
303 | |
304 class JvmtiCurrentBreakpoints : public AllStatic { | |
305 | |
306 private: | |
307 | |
308 // Current breakpoints, lazily initialized by get_jvmti_breakpoints(); | |
309 static JvmtiBreakpoints *_jvmti_breakpoints; | |
310 | |
311 // NULL terminated cache of byte-code pointers corresponding to current breakpoints. | |
312 // Updated only at safepoints (with listener_fun) when the cache is moved. | |
313 // It exists only to make is_breakpoint fast. | |
314 static address *_breakpoint_list; | |
315 static inline void set_breakpoint_list(address *breakpoint_list) { _breakpoint_list = breakpoint_list; } | |
316 static inline address *get_breakpoint_list() { return _breakpoint_list; } | |
317 | |
318 // Listener for the GrowableCache in _jvmti_breakpoints, updates _breakpoint_list. | |
319 static void listener_fun(void *this_obj, address *cache); | |
320 | |
321 public: | |
322 static void initialize(); | |
323 static void destroy(); | |
324 | |
325 // lazily create _jvmti_breakpoints and _breakpoint_list | |
326 static JvmtiBreakpoints& get_jvmti_breakpoints(); | |
327 | |
328 // quickly test whether the bcp matches a cached breakpoint in the list | |
329 static inline bool is_breakpoint(address bcp); | |
330 | |
331 static void oops_do(OopClosure* f); | |
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332 static void gc_epilogue(); |
0 | 333 }; |
334 | |
335 // quickly test whether the bcp matches a cached breakpoint in the list | |
336 bool JvmtiCurrentBreakpoints::is_breakpoint(address bcp) { | |
337 address *bps = get_breakpoint_list(); | |
338 if (bps == NULL) return false; | |
339 for ( ; (*bps) != NULL; bps++) { | |
340 if ((*bps) == bcp) return true; | |
341 } | |
342 return false; | |
343 } | |
344 | |
345 /////////////////////////////////////////////////////////////// | |
346 // The get/set local operations must only be done by the VM thread | |
347 // because the interpreter version needs to access oop maps, which can | |
348 // only safely be done by the VM thread | |
349 // | |
350 // I'm told that in 1.5 oop maps are now protected by a lock and | |
351 // we could get rid of the VM op | |
352 // However if the VM op is removed then the target thread must | |
353 // be suspended AND a lock will be needed to prevent concurrent | |
354 // setting of locals to the same java thread. This lock is needed | |
355 // to prevent compiledVFrames from trying to add deferred updates | |
356 // to the thread simultaneously. | |
357 // | |
358 class VM_GetOrSetLocal : public VM_Operation { | |
2019 | 359 protected: |
0 | 360 JavaThread* _thread; |
361 JavaThread* _calling_thread; | |
362 jint _depth; | |
363 jint _index; | |
364 BasicType _type; | |
365 jvalue _value; | |
366 javaVFrame* _jvf; | |
367 bool _set; | |
368 | |
2019 | 369 // It is possible to get the receiver out of a non-static native wrapper |
370 // frame. Use VM_GetReceiver to do this. | |
371 virtual bool getting_receiver() const { return false; } | |
372 | |
0 | 373 jvmtiError _result; |
374 | |
375 vframe* get_vframe(); | |
376 javaVFrame* get_java_vframe(); | |
377 bool check_slot_type(javaVFrame* vf); | |
378 | |
379 public: | |
380 // Constructor for non-object getter | |
381 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type); | |
382 | |
383 // Constructor for object or non-object setter | |
384 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type, jvalue value); | |
385 | |
386 // Constructor for object getter | |
387 VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, | |
388 int index); | |
389 | |
390 VMOp_Type type() const { return VMOp_GetOrSetLocal; } | |
391 jvalue value() { return _value; } | |
392 jvmtiError result() { return _result; } | |
393 | |
394 bool doit_prologue(); | |
395 void doit(); | |
396 bool allow_nested_vm_operations() const; | |
397 const char* name() const { return "get/set locals"; } | |
398 | |
399 // Check that the klass is assignable to a type with the given signature. | |
400 static bool is_assignable(const char* ty_sign, Klass* klass, Thread* thread); | |
401 }; | |
402 | |
2019 | 403 class VM_GetReceiver : public VM_GetOrSetLocal { |
404 protected: | |
405 virtual bool getting_receiver() const { return true; } | |
406 | |
407 public: | |
408 VM_GetReceiver(JavaThread* thread, JavaThread* calling_thread, jint depth); | |
409 const char* name() const { return "get receiver"; } | |
410 }; | |
411 | |
0 | 412 |
413 /////////////////////////////////////////////////////////////// | |
414 // | |
415 // class JvmtiSuspendControl | |
416 // | |
417 // Convenience routines for suspending and resuming threads. | |
418 // | |
419 // All attempts by JVMTI to suspend and resume threads must go through the | |
420 // JvmtiSuspendControl interface. | |
421 // | |
422 // methods return true if successful | |
423 // | |
424 class JvmtiSuspendControl : public AllStatic { | |
425 public: | |
426 // suspend the thread, taking it to a safepoint | |
427 static bool suspend(JavaThread *java_thread); | |
428 // resume the thread | |
429 static bool resume(JavaThread *java_thread); | |
430 | |
431 static void print(); | |
432 }; | |
433 | |
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434 #endif // !JVMTI_KERNEL |
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435 |
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436 /** |
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437 * When a thread (such as the compiler thread or VM thread) cannot post a |
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438 * JVMTI event itself because the event needs to be posted from a Java |
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439 * thread, then it can defer the event to the Service thread for posting. |
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440 * The information needed to post the event is encapsulated into this class |
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441 * and then enqueued onto the JvmtiDeferredEventQueue, where the Service |
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442 * thread will pick it up and post it. |
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443 * |
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444 * This is currently only used for posting compiled-method-load and unload |
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445 * events, which we don't want posted from the compiler thread. |
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446 */ |
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447 class JvmtiDeferredEvent VALUE_OBJ_CLASS_SPEC { |
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448 friend class JvmtiDeferredEventQueue; |
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449 private: |
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450 typedef enum { |
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451 TYPE_NONE, |
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452 TYPE_COMPILED_METHOD_LOAD, |
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453 TYPE_COMPILED_METHOD_UNLOAD, |
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454 TYPE_DYNAMIC_CODE_GENERATED |
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455 } Type; |
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456 |
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457 Type _type; |
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458 union { |
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459 nmethod* compiled_method_load; |
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460 struct { |
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461 nmethod* nm; |
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462 jmethodID method_id; |
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463 const void* code_begin; |
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464 } compiled_method_unload; |
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465 struct { |
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466 const char* name; |
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467 const void* code_begin; |
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468 const void* code_end; |
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469 } dynamic_code_generated; |
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470 } _event_data; |
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471 |
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472 JvmtiDeferredEvent(Type t) : _type(t) {} |
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473 |
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474 public: |
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475 |
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476 JvmtiDeferredEvent() : _type(TYPE_NONE) {} |
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477 |
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478 // Factory methods |
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479 static JvmtiDeferredEvent compiled_method_load_event(nmethod* nm) |
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480 KERNEL_RETURN_(JvmtiDeferredEvent()); |
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481 static JvmtiDeferredEvent compiled_method_unload_event(nmethod* nm, |
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482 jmethodID id, const void* code) KERNEL_RETURN_(JvmtiDeferredEvent()); |
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483 static JvmtiDeferredEvent dynamic_code_generated_event( |
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484 const char* name, const void* begin, const void* end) |
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485 KERNEL_RETURN_(JvmtiDeferredEvent()); |
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486 |
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487 // Actually posts the event. |
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488 void post() KERNEL_RETURN; |
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489 }; |
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490 |
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491 /** |
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492 * Events enqueued on this queue wake up the Service thread which dequeues |
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493 * and posts the events. The Service_lock is required to be held |
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494 * when operating on the queue (except for the "pending" events). |
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495 */ |
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496 class JvmtiDeferredEventQueue : AllStatic { |
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497 friend class JvmtiDeferredEvent; |
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498 private: |
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499 class QueueNode : public CHeapObj { |
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500 private: |
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501 JvmtiDeferredEvent _event; |
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502 QueueNode* _next; |
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503 |
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504 public: |
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505 QueueNode(const JvmtiDeferredEvent& event) |
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506 : _event(event), _next(NULL) {} |
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507 |
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508 const JvmtiDeferredEvent& event() const { return _event; } |
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509 QueueNode* next() const { return _next; } |
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510 |
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511 void set_next(QueueNode* next) { _next = next; } |
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512 }; |
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513 |
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514 static QueueNode* _queue_head; // Hold Service_lock to access |
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515 static QueueNode* _queue_tail; // Hold Service_lock to access |
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516 static volatile QueueNode* _pending_list; // Uses CAS for read/update |
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517 |
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518 // Transfers events from the _pending_list to the _queue. |
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519 static void process_pending_events() KERNEL_RETURN; |
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520 |
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521 public: |
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522 // Must be holding Service_lock when calling these |
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523 static bool has_events() KERNEL_RETURN_(false); |
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524 static void enqueue(const JvmtiDeferredEvent& event) KERNEL_RETURN; |
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525 static JvmtiDeferredEvent dequeue() KERNEL_RETURN_(JvmtiDeferredEvent()); |
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526 |
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527 // Used to enqueue events without using a lock, for times (such as during |
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528 // safepoint) when we can't or don't want to lock the Service_lock. |
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529 // |
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530 // Events will be held off to the side until there's a call to |
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531 // dequeue(), enqueue(), or process_pending_events() (all of which require |
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532 // the holding of the Service_lock), and will be enqueued at that time. |
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533 static void add_pending_event(const JvmtiDeferredEvent&) KERNEL_RETURN; |
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534 }; |
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535 |
0 | 536 // Utility macro that checks for NULL pointers: |
537 #define NULL_CHECK(X, Y) if ((X) == NULL) { return (Y); } | |
1972 | 538 |
539 #endif // SHARE_VM_PRIMS_JVMTIIMPL_HPP |