Tue, 14 Jan 2014 12:44:12 +0100
8030662: "assert(counter_changed) failed: failed dependencies, but counter didn't change" still fails
Summary: Erroneously removed call to SystemDictionary::notice_modification() from jvmti with fix for 8029383
Reviewed-by: iveresov, twisti, kvn
1 /*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
25 #ifndef SHARE_VM_PRIMS_JVMTIIMPL_HPP
26 #define SHARE_VM_PRIMS_JVMTIIMPL_HPP
28 #include "classfile/systemDictionary.hpp"
29 #include "jvmtifiles/jvmti.h"
30 #include "oops/objArrayOop.hpp"
31 #include "prims/jvmtiEnvThreadState.hpp"
32 #include "prims/jvmtiEventController.hpp"
33 #include "prims/jvmtiTrace.hpp"
34 #include "prims/jvmtiUtil.hpp"
35 #include "runtime/stackValueCollection.hpp"
36 #include "runtime/vm_operations.hpp"
38 //
39 // Forward Declarations
40 //
42 class JvmtiBreakpoint;
43 class JvmtiBreakpoints;
46 ///////////////////////////////////////////////////////////////
47 //
48 // class GrowableCache, GrowableElement
49 // Used by : JvmtiBreakpointCache
50 // Used by JVMTI methods: none directly.
51 //
52 // GrowableCache is a permanent CHeap growable array of <GrowableElement *>
53 //
54 // In addition, the GrowableCache maintains a NULL terminated cache array of type address
55 // that's created from the element array using the function:
56 // address GrowableElement::getCacheValue().
57 //
58 // Whenever the GrowableArray changes size, the cache array gets recomputed into a new C_HEAP allocated
59 // block of memory. Additionally, every time the cache changes its position in memory, the
60 // void (*_listener_fun)(void *this_obj, address* cache)
61 // gets called with the cache's new address. This gives the user of the GrowableCache a callback
62 // to update its pointer to the address cache.
63 //
65 class GrowableElement : public CHeapObj<mtInternal> {
66 public:
67 virtual address getCacheValue() =0;
68 virtual bool equals(GrowableElement* e) =0;
69 virtual bool lessThan(GrowableElement *e)=0;
70 virtual GrowableElement *clone() =0;
71 virtual void oops_do(OopClosure* f) =0;
72 virtual void metadata_do(void f(Metadata*)) =0;
73 };
75 class GrowableCache VALUE_OBJ_CLASS_SPEC {
77 private:
78 // Object pointer passed into cache & listener functions.
79 void *_this_obj;
81 // Array of elements in the collection
82 GrowableArray<GrowableElement *> *_elements;
84 // Parallel array of cached values
85 address *_cache;
87 // Listener for changes to the _cache field.
88 // Called whenever the _cache field has it's value changed
89 // (but NOT when cached elements are recomputed).
90 void (*_listener_fun)(void *, address*);
92 static bool equals(void *, GrowableElement *);
94 // recache all elements after size change, notify listener
95 void recache();
97 public:
98 GrowableCache();
99 ~GrowableCache();
101 void initialize(void *this_obj, void listener_fun(void *, address*) );
103 // number of elements in the collection
104 int length();
105 // get the value of the index element in the collection
106 GrowableElement* at(int index);
107 // find the index of the element, -1 if it doesn't exist
108 int find(GrowableElement* e);
109 // append a copy of the element to the end of the collection, notify listener
110 void append(GrowableElement* e);
111 // insert a copy of the element using lessthan(), notify listener
112 void insert(GrowableElement* e);
113 // remove the element at index, notify listener
114 void remove (int index);
115 // clear out all elements and release all heap space, notify listener
116 void clear();
117 // apply f to every element and update the cache
118 void oops_do(OopClosure* f);
119 // walk metadata to preserve for RedefineClasses
120 void metadata_do(void f(Metadata*));
121 // update the cache after a full gc
122 void gc_epilogue();
123 };
126 ///////////////////////////////////////////////////////////////
127 //
128 // class JvmtiBreakpointCache
129 // Used by : JvmtiBreakpoints
130 // Used by JVMTI methods: none directly.
131 // Note : typesafe wrapper for GrowableCache of JvmtiBreakpoint
132 //
134 class JvmtiBreakpointCache : public CHeapObj<mtInternal> {
136 private:
137 GrowableCache _cache;
139 public:
140 JvmtiBreakpointCache() {}
141 ~JvmtiBreakpointCache() {}
143 void initialize(void *this_obj, void listener_fun(void *, address*) ) {
144 _cache.initialize(this_obj,listener_fun);
145 }
147 int length() { return _cache.length(); }
148 JvmtiBreakpoint& at(int index) { return (JvmtiBreakpoint&) *(_cache.at(index)); }
149 int find(JvmtiBreakpoint& e) { return _cache.find((GrowableElement *) &e); }
150 void append(JvmtiBreakpoint& e) { _cache.append((GrowableElement *) &e); }
151 void remove (int index) { _cache.remove(index); }
152 void clear() { _cache.clear(); }
153 void oops_do(OopClosure* f) { _cache.oops_do(f); }
154 void metadata_do(void f(Metadata*)) { _cache.metadata_do(f); }
155 void gc_epilogue() { _cache.gc_epilogue(); }
156 };
159 ///////////////////////////////////////////////////////////////
160 //
161 // class JvmtiBreakpoint
162 // Used by : JvmtiBreakpoints
163 // Used by JVMTI methods: SetBreakpoint, ClearBreakpoint, ClearAllBreakpoints
164 // Note: Extends GrowableElement for use in a GrowableCache
165 //
166 // A JvmtiBreakpoint describes a location (class, method, bci) to break at.
167 //
169 typedef void (Method::*method_action)(int _bci);
171 class JvmtiBreakpoint : public GrowableElement {
172 private:
173 Method* _method;
174 int _bci;
175 Bytecodes::Code _orig_bytecode;
176 oop _class_holder; // keeps _method memory from being deallocated
178 public:
179 JvmtiBreakpoint();
180 JvmtiBreakpoint(Method* m_method, jlocation location);
181 bool equals(JvmtiBreakpoint& bp);
182 bool lessThan(JvmtiBreakpoint &bp);
183 void copy(JvmtiBreakpoint& bp);
184 bool is_valid();
185 address getBcp();
186 void each_method_version_do(method_action meth_act);
187 void set();
188 void clear();
189 void print();
191 Method* method() { return _method; }
193 // GrowableElement implementation
194 address getCacheValue() { return getBcp(); }
195 bool lessThan(GrowableElement* e) { Unimplemented(); return false; }
196 bool equals(GrowableElement* e) { return equals((JvmtiBreakpoint&) *e); }
197 void oops_do(OopClosure* f) {
198 // Mark the method loader as live so the Method* class loader doesn't get
199 // unloaded and Method* memory reclaimed.
200 f->do_oop(&_class_holder);
201 }
202 void metadata_do(void f(Metadata*)) {
203 // walk metadata to preserve for RedefineClasses
204 f(_method);
205 }
207 GrowableElement *clone() {
208 JvmtiBreakpoint *bp = new JvmtiBreakpoint();
209 bp->copy(*this);
210 return bp;
211 }
212 };
215 ///////////////////////////////////////////////////////////////
216 //
217 // class JvmtiBreakpoints
218 // Used by : JvmtiCurrentBreakpoints
219 // Used by JVMTI methods: none directly
220 // Note: A Helper class
221 //
222 // JvmtiBreakpoints is a GrowableCache of JvmtiBreakpoint.
223 // All changes to the GrowableCache occur at a safepoint using VM_ChangeBreakpoints.
224 //
225 // Because _bps is only modified at safepoints, its possible to always use the
226 // cached byte code pointers from _bps without doing any synchronization (see JvmtiCurrentBreakpoints).
227 //
228 // It would be possible to make JvmtiBreakpoints a static class, but I've made it
229 // CHeap allocated to emphasize its similarity to JvmtiFramePops.
230 //
232 class JvmtiBreakpoints : public CHeapObj<mtInternal> {
233 private:
235 JvmtiBreakpointCache _bps;
237 // These should only be used by VM_ChangeBreakpoints
238 // to insure they only occur at safepoints.
239 // Todo: add checks for safepoint
240 friend class VM_ChangeBreakpoints;
241 void set_at_safepoint(JvmtiBreakpoint& bp);
242 void clear_at_safepoint(JvmtiBreakpoint& bp);
244 static void do_element(GrowableElement *e);
246 public:
247 JvmtiBreakpoints(void listener_fun(void *, address *));
248 ~JvmtiBreakpoints();
250 int length();
251 void oops_do(OopClosure* f);
252 void metadata_do(void f(Metadata*));
253 void print();
255 int set(JvmtiBreakpoint& bp);
256 int clear(JvmtiBreakpoint& bp);
257 void clearall_in_class_at_safepoint(Klass* klass);
258 void gc_epilogue();
259 };
262 ///////////////////////////////////////////////////////////////
263 //
264 // class JvmtiCurrentBreakpoints
265 //
266 // A static wrapper class for the JvmtiBreakpoints that provides:
267 // 1. a fast inlined function to check if a byte code pointer is a breakpoint (is_breakpoint).
268 // 2. a function for lazily creating the JvmtiBreakpoints class (this is not strictly necessary,
269 // but I'm copying the code from JvmtiThreadState which needs to lazily initialize
270 // JvmtiFramePops).
271 // 3. An oops_do entry point for GC'ing the breakpoint array.
272 //
274 class JvmtiCurrentBreakpoints : public AllStatic {
276 private:
278 // Current breakpoints, lazily initialized by get_jvmti_breakpoints();
279 static JvmtiBreakpoints *_jvmti_breakpoints;
281 // NULL terminated cache of byte-code pointers corresponding to current breakpoints.
282 // Updated only at safepoints (with listener_fun) when the cache is moved.
283 // It exists only to make is_breakpoint fast.
284 static address *_breakpoint_list;
285 static inline void set_breakpoint_list(address *breakpoint_list) { _breakpoint_list = breakpoint_list; }
286 static inline address *get_breakpoint_list() { return _breakpoint_list; }
288 // Listener for the GrowableCache in _jvmti_breakpoints, updates _breakpoint_list.
289 static void listener_fun(void *this_obj, address *cache);
291 public:
292 static void initialize();
293 static void destroy();
295 // lazily create _jvmti_breakpoints and _breakpoint_list
296 static JvmtiBreakpoints& get_jvmti_breakpoints();
298 // quickly test whether the bcp matches a cached breakpoint in the list
299 static inline bool is_breakpoint(address bcp);
301 static void oops_do(OopClosure* f);
302 static void metadata_do(void f(Metadata*)) NOT_JVMTI_RETURN;
303 static void gc_epilogue();
304 };
306 // quickly test whether the bcp matches a cached breakpoint in the list
307 bool JvmtiCurrentBreakpoints::is_breakpoint(address bcp) {
308 address *bps = get_breakpoint_list();
309 if (bps == NULL) return false;
310 for ( ; (*bps) != NULL; bps++) {
311 if ((*bps) == bcp) return true;
312 }
313 return false;
314 }
317 ///////////////////////////////////////////////////////////////
318 //
319 // class VM_ChangeBreakpoints
320 // Used by : JvmtiBreakpoints
321 // Used by JVMTI methods: none directly.
322 // Note: A Helper class.
323 //
324 // VM_ChangeBreakpoints implements a VM_Operation for ALL modifications to the JvmtiBreakpoints class.
325 //
327 class VM_ChangeBreakpoints : public VM_Operation {
328 private:
329 JvmtiBreakpoints* _breakpoints;
330 int _operation;
331 JvmtiBreakpoint* _bp;
333 public:
334 enum { SET_BREAKPOINT=0, CLEAR_BREAKPOINT=1 };
336 VM_ChangeBreakpoints(int operation, JvmtiBreakpoint *bp) {
337 JvmtiBreakpoints& current_bps = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
338 _breakpoints = ¤t_bps;
339 _bp = bp;
340 _operation = operation;
341 assert(bp != NULL, "bp != NULL");
342 }
344 VMOp_Type type() const { return VMOp_ChangeBreakpoints; }
345 void doit();
346 void oops_do(OopClosure* f);
347 void metadata_do(void f(Metadata*));
348 };
351 ///////////////////////////////////////////////////////////////
352 // The get/set local operations must only be done by the VM thread
353 // because the interpreter version needs to access oop maps, which can
354 // only safely be done by the VM thread
355 //
356 // I'm told that in 1.5 oop maps are now protected by a lock and
357 // we could get rid of the VM op
358 // However if the VM op is removed then the target thread must
359 // be suspended AND a lock will be needed to prevent concurrent
360 // setting of locals to the same java thread. This lock is needed
361 // to prevent compiledVFrames from trying to add deferred updates
362 // to the thread simultaneously.
363 //
364 class VM_GetOrSetLocal : public VM_Operation {
365 protected:
366 JavaThread* _thread;
367 JavaThread* _calling_thread;
368 jint _depth;
369 jint _index;
370 BasicType _type;
371 jvalue _value;
372 javaVFrame* _jvf;
373 bool _set;
375 // It is possible to get the receiver out of a non-static native wrapper
376 // frame. Use VM_GetReceiver to do this.
377 virtual bool getting_receiver() const { return false; }
379 jvmtiError _result;
381 vframe* get_vframe();
382 javaVFrame* get_java_vframe();
383 bool check_slot_type(javaVFrame* vf);
385 public:
386 // Constructor for non-object getter
387 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type);
389 // Constructor for object or non-object setter
390 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type, jvalue value);
392 // Constructor for object getter
393 VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth,
394 int index);
396 VMOp_Type type() const { return VMOp_GetOrSetLocal; }
397 jvalue value() { return _value; }
398 jvmtiError result() { return _result; }
400 bool doit_prologue();
401 void doit();
402 bool allow_nested_vm_operations() const;
403 const char* name() const { return "get/set locals"; }
405 // Check that the klass is assignable to a type with the given signature.
406 static bool is_assignable(const char* ty_sign, Klass* klass, Thread* thread);
407 };
409 class VM_GetReceiver : public VM_GetOrSetLocal {
410 protected:
411 virtual bool getting_receiver() const { return true; }
413 public:
414 VM_GetReceiver(JavaThread* thread, JavaThread* calling_thread, jint depth);
415 const char* name() const { return "get receiver"; }
416 };
419 ///////////////////////////////////////////////////////////////
420 //
421 // class JvmtiSuspendControl
422 //
423 // Convenience routines for suspending and resuming threads.
424 //
425 // All attempts by JVMTI to suspend and resume threads must go through the
426 // JvmtiSuspendControl interface.
427 //
428 // methods return true if successful
429 //
430 class JvmtiSuspendControl : public AllStatic {
431 public:
432 // suspend the thread, taking it to a safepoint
433 static bool suspend(JavaThread *java_thread);
434 // resume the thread
435 static bool resume(JavaThread *java_thread);
437 static void print();
438 };
441 /**
442 * When a thread (such as the compiler thread or VM thread) cannot post a
443 * JVMTI event itself because the event needs to be posted from a Java
444 * thread, then it can defer the event to the Service thread for posting.
445 * The information needed to post the event is encapsulated into this class
446 * and then enqueued onto the JvmtiDeferredEventQueue, where the Service
447 * thread will pick it up and post it.
448 *
449 * This is currently only used for posting compiled-method-load and unload
450 * events, which we don't want posted from the compiler thread.
451 */
452 class JvmtiDeferredEvent VALUE_OBJ_CLASS_SPEC {
453 friend class JvmtiDeferredEventQueue;
454 private:
455 typedef enum {
456 TYPE_NONE,
457 TYPE_COMPILED_METHOD_LOAD,
458 TYPE_COMPILED_METHOD_UNLOAD,
459 TYPE_DYNAMIC_CODE_GENERATED
460 } Type;
462 Type _type;
463 union {
464 nmethod* compiled_method_load;
465 struct {
466 nmethod* nm;
467 jmethodID method_id;
468 const void* code_begin;
469 } compiled_method_unload;
470 struct {
471 const char* name;
472 const void* code_begin;
473 const void* code_end;
474 } dynamic_code_generated;
475 } _event_data;
477 JvmtiDeferredEvent(Type t) : _type(t) {}
479 public:
481 JvmtiDeferredEvent() : _type(TYPE_NONE) {}
483 // Factory methods
484 static JvmtiDeferredEvent compiled_method_load_event(nmethod* nm)
485 NOT_JVMTI_RETURN_(JvmtiDeferredEvent());
486 static JvmtiDeferredEvent compiled_method_unload_event(nmethod* nm,
487 jmethodID id, const void* code) NOT_JVMTI_RETURN_(JvmtiDeferredEvent());
488 static JvmtiDeferredEvent dynamic_code_generated_event(
489 const char* name, const void* begin, const void* end)
490 NOT_JVMTI_RETURN_(JvmtiDeferredEvent());
492 // Actually posts the event.
493 void post() NOT_JVMTI_RETURN;
494 };
496 /**
497 * Events enqueued on this queue wake up the Service thread which dequeues
498 * and posts the events. The Service_lock is required to be held
499 * when operating on the queue (except for the "pending" events).
500 */
501 class JvmtiDeferredEventQueue : AllStatic {
502 friend class JvmtiDeferredEvent;
503 private:
504 class QueueNode : public CHeapObj<mtInternal> {
505 private:
506 JvmtiDeferredEvent _event;
507 QueueNode* _next;
509 public:
510 QueueNode(const JvmtiDeferredEvent& event)
511 : _event(event), _next(NULL) {}
513 const JvmtiDeferredEvent& event() const { return _event; }
514 QueueNode* next() const { return _next; }
516 void set_next(QueueNode* next) { _next = next; }
517 };
519 static QueueNode* _queue_head; // Hold Service_lock to access
520 static QueueNode* _queue_tail; // Hold Service_lock to access
521 static volatile QueueNode* _pending_list; // Uses CAS for read/update
523 // Transfers events from the _pending_list to the _queue.
524 static void process_pending_events() NOT_JVMTI_RETURN;
526 public:
527 // Must be holding Service_lock when calling these
528 static bool has_events() NOT_JVMTI_RETURN_(false);
529 static void enqueue(const JvmtiDeferredEvent& event) NOT_JVMTI_RETURN;
530 static JvmtiDeferredEvent dequeue() NOT_JVMTI_RETURN_(JvmtiDeferredEvent());
532 // Used to enqueue events without using a lock, for times (such as during
533 // safepoint) when we can't or don't want to lock the Service_lock.
534 //
535 // Events will be held off to the side until there's a call to
536 // dequeue(), enqueue(), or process_pending_events() (all of which require
537 // the holding of the Service_lock), and will be enqueued at that time.
538 static void add_pending_event(const JvmtiDeferredEvent&) NOT_JVMTI_RETURN;
539 };
541 // Utility macro that checks for NULL pointers:
542 #define NULL_CHECK(X, Y) if ((X) == NULL) { return (Y); }
544 #endif // SHARE_VM_PRIMS_JVMTIIMPL_HPP