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annotate src/share/vm/prims/jvmtiImpl.hpp @ 1615:ff38d05ea86f
6956958: assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() || is_optimized() || is_megam
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author | never |
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date | Fri, 18 Jun 2010 16:51:54 -0700 |
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children | fa83ab460c54 |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
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7 * published by the Free Software Foundation. | |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 // | |
26 // Forward Declarations | |
27 // | |
28 | |
29 class JvmtiRawMonitor; | |
30 class JvmtiBreakpoint; | |
31 class JvmtiBreakpoints; | |
32 | |
33 | |
34 /////////////////////////////////////////////////////////////// | |
35 // | |
36 // class GrowableCache, GrowableElement | |
37 // Used by : JvmtiBreakpointCache | |
38 // Used by JVMTI methods: none directly. | |
39 // | |
40 // GrowableCache is a permanent CHeap growable array of <GrowableElement *> | |
41 // | |
42 // In addition, the GrowableCache maintains a NULL terminated cache array of type address | |
43 // that's created from the element array using the function: | |
44 // address GrowableElement::getCacheValue(). | |
45 // | |
46 // Whenever the GrowableArray changes size, the cache array gets recomputed into a new C_HEAP allocated | |
47 // block of memory. Additionally, every time the cache changes its position in memory, the | |
48 // void (*_listener_fun)(void *this_obj, address* cache) | |
49 // gets called with the cache's new address. This gives the user of the GrowableCache a callback | |
50 // to update its pointer to the address cache. | |
51 // | |
52 | |
53 class GrowableElement : public CHeapObj { | |
54 public: | |
55 virtual address getCacheValue() =0; | |
56 virtual bool equals(GrowableElement* e) =0; | |
57 virtual bool lessThan(GrowableElement *e)=0; | |
58 virtual GrowableElement *clone() =0; | |
59 virtual void oops_do(OopClosure* f) =0; | |
60 }; | |
61 | |
62 class GrowableCache VALUE_OBJ_CLASS_SPEC { | |
63 | |
64 private: | |
65 // Object pointer passed into cache & listener functions. | |
66 void *_this_obj; | |
67 | |
68 // Array of elements in the collection | |
69 GrowableArray<GrowableElement *> *_elements; | |
70 | |
71 // Parallel array of cached values | |
72 address *_cache; | |
73 | |
74 // Listener for changes to the _cache field. | |
75 // Called whenever the _cache field has it's value changed | |
76 // (but NOT when cached elements are recomputed). | |
77 void (*_listener_fun)(void *, address*); | |
78 | |
79 static bool equals(void *, GrowableElement *); | |
80 | |
81 // recache all elements after size change, notify listener | |
82 void recache(); | |
83 | |
84 public: | |
85 GrowableCache(); | |
86 ~GrowableCache(); | |
87 | |
88 void initialize(void *this_obj, void listener_fun(void *, address*) ); | |
89 | |
90 // number of elements in the collection | |
91 int length(); | |
92 // get the value of the index element in the collection | |
93 GrowableElement* at(int index); | |
94 // find the index of the element, -1 if it doesn't exist | |
95 int find(GrowableElement* e); | |
96 // append a copy of the element to the end of the collection, notify listener | |
97 void append(GrowableElement* e); | |
98 // insert a copy of the element using lessthan(), notify listener | |
99 void insert(GrowableElement* e); | |
100 // remove the element at index, notify listener | |
101 void remove (int index); | |
102 // clear out all elements and release all heap space, notify listener | |
103 void clear(); | |
104 // apply f to every element and update the cache | |
105 void oops_do(OopClosure* f); | |
106 void gc_epilogue(); | |
107 }; | |
108 | |
109 | |
110 /////////////////////////////////////////////////////////////// | |
111 // | |
112 // class JvmtiBreakpointCache | |
113 // Used by : JvmtiBreakpoints | |
114 // Used by JVMTI methods: none directly. | |
115 // Note : typesafe wrapper for GrowableCache of JvmtiBreakpoint | |
116 // | |
117 | |
118 class JvmtiBreakpointCache : public CHeapObj { | |
119 | |
120 private: | |
121 GrowableCache _cache; | |
122 | |
123 public: | |
124 JvmtiBreakpointCache() {} | |
125 ~JvmtiBreakpointCache() {} | |
126 | |
127 void initialize(void *this_obj, void listener_fun(void *, address*) ) { | |
128 _cache.initialize(this_obj,listener_fun); | |
129 } | |
130 | |
131 int length() { return _cache.length(); } | |
132 JvmtiBreakpoint& at(int index) { return (JvmtiBreakpoint&) *(_cache.at(index)); } | |
133 int find(JvmtiBreakpoint& e) { return _cache.find((GrowableElement *) &e); } | |
134 void append(JvmtiBreakpoint& e) { _cache.append((GrowableElement *) &e); } | |
135 void remove (int index) { _cache.remove(index); } | |
136 void clear() { _cache.clear(); } | |
137 void oops_do(OopClosure* f) { _cache.oops_do(f); } | |
138 void gc_epilogue() { _cache.gc_epilogue(); } | |
139 }; | |
140 | |
141 | |
142 /////////////////////////////////////////////////////////////// | |
143 // | |
144 // class JvmtiBreakpoint | |
145 // Used by : JvmtiBreakpoints | |
146 // Used by JVMTI methods: SetBreakpoint, ClearBreakpoint, ClearAllBreakpoints | |
147 // Note: Extends GrowableElement for use in a GrowableCache | |
148 // | |
149 // A JvmtiBreakpoint describes a location (class, method, bci) to break at. | |
150 // | |
151 | |
152 typedef void (methodOopDesc::*method_action)(int _bci); | |
153 | |
154 class JvmtiBreakpoint : public GrowableElement { | |
155 private: | |
156 methodOop _method; | |
157 int _bci; | |
158 Bytecodes::Code _orig_bytecode; | |
159 | |
160 public: | |
161 JvmtiBreakpoint(); | |
162 JvmtiBreakpoint(methodOop m_method, jlocation location); | |
163 bool equals(JvmtiBreakpoint& bp); | |
164 bool lessThan(JvmtiBreakpoint &bp); | |
165 void copy(JvmtiBreakpoint& bp); | |
166 bool is_valid(); | |
167 address getBcp(); | |
168 void each_method_version_do(method_action meth_act); | |
169 void set(); | |
170 void clear(); | |
171 void print(); | |
172 | |
173 methodOop method() { return _method; } | |
174 | |
175 // GrowableElement implementation | |
176 address getCacheValue() { return getBcp(); } | |
177 bool lessThan(GrowableElement* e) { Unimplemented(); return false; } | |
178 bool equals(GrowableElement* e) { return equals((JvmtiBreakpoint&) *e); } | |
179 void oops_do(OopClosure* f) { f->do_oop((oop *) &_method); } | |
180 GrowableElement *clone() { | |
181 JvmtiBreakpoint *bp = new JvmtiBreakpoint(); | |
182 bp->copy(*this); | |
183 return bp; | |
184 } | |
185 }; | |
186 | |
187 | |
188 /////////////////////////////////////////////////////////////// | |
189 // | |
190 // class VM_ChangeBreakpoints | |
191 // Used by : JvmtiBreakpoints | |
192 // Used by JVMTI methods: none directly. | |
193 // Note: A Helper class. | |
194 // | |
195 // VM_ChangeBreakpoints implements a VM_Operation for ALL modifications to the JvmtiBreakpoints class. | |
196 // | |
197 | |
198 class VM_ChangeBreakpoints : public VM_Operation { | |
199 private: | |
200 JvmtiBreakpoints* _breakpoints; | |
201 int _operation; | |
202 JvmtiBreakpoint* _bp; | |
203 | |
204 public: | |
205 enum { SET_BREAKPOINT=0, CLEAR_BREAKPOINT=1, CLEAR_ALL_BREAKPOINT=2 }; | |
206 | |
207 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation) { | |
208 _breakpoints = breakpoints; | |
209 _bp = NULL; | |
210 _operation = operation; | |
211 assert(breakpoints != NULL, "breakpoints != NULL"); | |
212 assert(operation == CLEAR_ALL_BREAKPOINT, "unknown breakpoint operation"); | |
213 } | |
214 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation, JvmtiBreakpoint *bp) { | |
215 _breakpoints = breakpoints; | |
216 _bp = bp; | |
217 _operation = operation; | |
218 assert(breakpoints != NULL, "breakpoints != NULL"); | |
219 assert(bp != NULL, "bp != NULL"); | |
220 assert(operation == SET_BREAKPOINT || operation == CLEAR_BREAKPOINT , "unknown breakpoint operation"); | |
221 } | |
222 | |
223 VMOp_Type type() const { return VMOp_ChangeBreakpoints; } | |
224 void doit(); | |
225 void oops_do(OopClosure* f); | |
226 }; | |
227 | |
228 | |
229 /////////////////////////////////////////////////////////////// | |
230 // | |
231 // class JvmtiBreakpoints | |
232 // Used by : JvmtiCurrentBreakpoints | |
233 // Used by JVMTI methods: none directly | |
234 // Note: A Helper class | |
235 // | |
236 // JvmtiBreakpoints is a GrowableCache of JvmtiBreakpoint. | |
237 // All changes to the GrowableCache occur at a safepoint using VM_ChangeBreakpoints. | |
238 // | |
239 // Because _bps is only modified at safepoints, its possible to always use the | |
240 // cached byte code pointers from _bps without doing any synchronization (see JvmtiCurrentBreakpoints). | |
241 // | |
242 // It would be possible to make JvmtiBreakpoints a static class, but I've made it | |
243 // CHeap allocated to emphasize its similarity to JvmtiFramePops. | |
244 // | |
245 | |
246 class JvmtiBreakpoints : public CHeapObj { | |
247 private: | |
248 | |
249 JvmtiBreakpointCache _bps; | |
250 | |
251 // These should only be used by VM_ChangeBreakpoints | |
252 // to insure they only occur at safepoints. | |
253 // Todo: add checks for safepoint | |
254 friend class VM_ChangeBreakpoints; | |
255 void set_at_safepoint(JvmtiBreakpoint& bp); | |
256 void clear_at_safepoint(JvmtiBreakpoint& bp); | |
257 void clearall_at_safepoint(); | |
258 | |
259 static void do_element(GrowableElement *e); | |
260 | |
261 public: | |
262 JvmtiBreakpoints(void listener_fun(void *, address *)); | |
263 ~JvmtiBreakpoints(); | |
264 | |
265 int length(); | |
266 void oops_do(OopClosure* f); | |
267 void gc_epilogue(); | |
268 void print(); | |
269 | |
270 int set(JvmtiBreakpoint& bp); | |
271 int clear(JvmtiBreakpoint& bp); | |
272 void clearall_in_class_at_safepoint(klassOop klass); | |
273 void clearall(); | |
274 }; | |
275 | |
276 | |
277 /////////////////////////////////////////////////////////////// | |
278 // | |
279 // class JvmtiCurrentBreakpoints | |
280 // | |
281 // A static wrapper class for the JvmtiBreakpoints that provides: | |
282 // 1. a fast inlined function to check if a byte code pointer is a breakpoint (is_breakpoint). | |
283 // 2. a function for lazily creating the JvmtiBreakpoints class (this is not strictly necessary, | |
284 // but I'm copying the code from JvmtiThreadState which needs to lazily initialize | |
285 // JvmtiFramePops). | |
286 // 3. An oops_do entry point for GC'ing the breakpoint array. | |
287 // | |
288 | |
289 class JvmtiCurrentBreakpoints : public AllStatic { | |
290 | |
291 private: | |
292 | |
293 // Current breakpoints, lazily initialized by get_jvmti_breakpoints(); | |
294 static JvmtiBreakpoints *_jvmti_breakpoints; | |
295 | |
296 // NULL terminated cache of byte-code pointers corresponding to current breakpoints. | |
297 // Updated only at safepoints (with listener_fun) when the cache is moved. | |
298 // It exists only to make is_breakpoint fast. | |
299 static address *_breakpoint_list; | |
300 static inline void set_breakpoint_list(address *breakpoint_list) { _breakpoint_list = breakpoint_list; } | |
301 static inline address *get_breakpoint_list() { return _breakpoint_list; } | |
302 | |
303 // Listener for the GrowableCache in _jvmti_breakpoints, updates _breakpoint_list. | |
304 static void listener_fun(void *this_obj, address *cache); | |
305 | |
306 public: | |
307 static void initialize(); | |
308 static void destroy(); | |
309 | |
310 // lazily create _jvmti_breakpoints and _breakpoint_list | |
311 static JvmtiBreakpoints& get_jvmti_breakpoints(); | |
312 | |
313 // quickly test whether the bcp matches a cached breakpoint in the list | |
314 static inline bool is_breakpoint(address bcp); | |
315 | |
316 static void oops_do(OopClosure* f); | |
317 static void gc_epilogue(); | |
318 }; | |
319 | |
320 // quickly test whether the bcp matches a cached breakpoint in the list | |
321 bool JvmtiCurrentBreakpoints::is_breakpoint(address bcp) { | |
322 address *bps = get_breakpoint_list(); | |
323 if (bps == NULL) return false; | |
324 for ( ; (*bps) != NULL; bps++) { | |
325 if ((*bps) == bcp) return true; | |
326 } | |
327 return false; | |
328 } | |
329 | |
330 | |
331 /////////////////////////////////////////////////////////////// | |
332 // | |
333 // class JvmtiRawMonitor | |
334 // | |
335 // Used by JVMTI methods: All RawMonitor methods (CreateRawMonitor, EnterRawMonitor, etc.) | |
336 // | |
337 // Wrapper for ObjectMonitor class that saves the Monitor's name | |
338 // | |
339 | |
340 class JvmtiRawMonitor : public ObjectMonitor { | |
341 private: | |
342 int _magic; | |
343 char * _name; | |
344 // JVMTI_RM_MAGIC is set in contructor and unset in destructor. | |
345 enum { JVMTI_RM_MAGIC = (int)(('T' << 24) | ('I' << 16) | ('R' << 8) | 'M') }; | |
346 | |
347 public: | |
348 JvmtiRawMonitor(const char *name); | |
349 ~JvmtiRawMonitor(); | |
350 int magic() { return _magic; } | |
351 const char *get_name() { return _name; } | |
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352 bool is_valid(); |
0 | 353 }; |
354 | |
355 // Onload pending raw monitors | |
356 // Class is used to cache onload or onstart monitor enter | |
357 // which will transition into real monitor when | |
358 // VM is fully initialized. | |
359 class JvmtiPendingMonitors : public AllStatic { | |
360 | |
361 private: | |
362 static GrowableArray<JvmtiRawMonitor*> *_monitors; // Cache raw monitor enter | |
363 | |
364 inline static GrowableArray<JvmtiRawMonitor*>* monitors() { return _monitors; } | |
365 | |
366 static void dispose() { | |
367 delete monitors(); | |
368 } | |
369 | |
370 public: | |
371 static void enter(JvmtiRawMonitor *monitor) { | |
372 monitors()->append(monitor); | |
373 } | |
374 | |
375 static int count() { | |
376 return monitors()->length(); | |
377 } | |
378 | |
379 static void destroy(JvmtiRawMonitor *monitor) { | |
380 while (monitors()->contains(monitor)) { | |
381 monitors()->remove(monitor); | |
382 } | |
383 } | |
384 | |
385 // Return false if monitor is not found in the list. | |
386 static bool exit(JvmtiRawMonitor *monitor) { | |
387 if (monitors()->contains(monitor)) { | |
388 monitors()->remove(monitor); | |
389 return true; | |
390 } else { | |
391 return false; | |
392 } | |
393 } | |
394 | |
395 static void transition_raw_monitors(); | |
396 }; | |
397 | |
398 | |
399 | |
400 /////////////////////////////////////////////////////////////// | |
401 // The get/set local operations must only be done by the VM thread | |
402 // because the interpreter version needs to access oop maps, which can | |
403 // only safely be done by the VM thread | |
404 // | |
405 // I'm told that in 1.5 oop maps are now protected by a lock and | |
406 // we could get rid of the VM op | |
407 // However if the VM op is removed then the target thread must | |
408 // be suspended AND a lock will be needed to prevent concurrent | |
409 // setting of locals to the same java thread. This lock is needed | |
410 // to prevent compiledVFrames from trying to add deferred updates | |
411 // to the thread simultaneously. | |
412 // | |
413 class VM_GetOrSetLocal : public VM_Operation { | |
414 private: | |
415 JavaThread* _thread; | |
416 JavaThread* _calling_thread; | |
417 jint _depth; | |
418 jint _index; | |
419 BasicType _type; | |
420 jvalue _value; | |
421 javaVFrame* _jvf; | |
422 bool _set; | |
423 | |
424 jvmtiError _result; | |
425 | |
426 vframe* get_vframe(); | |
427 javaVFrame* get_java_vframe(); | |
428 bool check_slot_type(javaVFrame* vf); | |
429 | |
430 public: | |
431 // Constructor for non-object getter | |
432 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type); | |
433 | |
434 // Constructor for object or non-object setter | |
435 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type, jvalue value); | |
436 | |
437 // Constructor for object getter | |
438 VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, | |
439 int index); | |
440 | |
441 VMOp_Type type() const { return VMOp_GetOrSetLocal; } | |
442 jvalue value() { return _value; } | |
443 jvmtiError result() { return _result; } | |
444 | |
445 bool doit_prologue(); | |
446 void doit(); | |
447 bool allow_nested_vm_operations() const; | |
448 const char* name() const { return "get/set locals"; } | |
449 | |
450 // Check that the klass is assignable to a type with the given signature. | |
451 static bool is_assignable(const char* ty_sign, Klass* klass, Thread* thread); | |
452 }; | |
453 | |
454 | |
455 /////////////////////////////////////////////////////////////// | |
456 // | |
457 // class JvmtiSuspendControl | |
458 // | |
459 // Convenience routines for suspending and resuming threads. | |
460 // | |
461 // All attempts by JVMTI to suspend and resume threads must go through the | |
462 // JvmtiSuspendControl interface. | |
463 // | |
464 // methods return true if successful | |
465 // | |
466 class JvmtiSuspendControl : public AllStatic { | |
467 public: | |
468 // suspend the thread, taking it to a safepoint | |
469 static bool suspend(JavaThread *java_thread); | |
470 // resume the thread | |
471 static bool resume(JavaThread *java_thread); | |
472 | |
473 static void print(); | |
474 }; | |
475 | |
476 // Utility macro that checks for NULL pointers: | |
477 #define NULL_CHECK(X, Y) if ((X) == NULL) { return (Y); } |