1 /*
2 * Copyright (c) 1997, 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.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/codeCache.hpp"
30 #include "code/debugInfoRec.hpp"
31 #include "code/nmethod.hpp"
32 #include "code/pcDesc.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "interpreter/oopMapCache.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/instanceKlass.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "runtime/handles.inline.hpp"
40 #include "runtime/objectMonitor.hpp"
41 #include "runtime/objectMonitor.inline.hpp"
42 #include "runtime/signature.hpp"
43 #include "runtime/stubRoutines.hpp"
44 #include "runtime/synchronizer.hpp"
45 #include "runtime/vframe.hpp"
46 #include "runtime/vframeArray.hpp"
47 #include "runtime/vframe_hp.hpp"
48
49 vframe::vframe(const frame* fr, const RegisterMap* reg_map, JavaThread* thread)
50 : _reg_map(reg_map), _thread(thread) {
51 assert(fr != NULL, "must have frame");
52 _fr = *fr;
53 }
54
55 vframe::vframe(const frame* fr, JavaThread* thread)
56 : _reg_map(thread), _thread(thread) {
57 assert(fr != NULL, "must have frame");
58 _fr = *fr;
59 }
60
61 vframe* vframe::new_vframe(const frame* f, const RegisterMap* reg_map, JavaThread* thread) {
62 // Interpreter frame
63 if (f->is_interpreted_frame()) {
64 return new interpretedVFrame(f, reg_map, thread);
65 }
66
67 // Compiled frame
68 CodeBlob* cb = f->cb();
69 if (cb != NULL) {
70 if (cb->is_nmethod()) {
71 nmethod* nm = (nmethod*)cb;
72 return new compiledVFrame(f, reg_map, thread, nm);
73 }
74
75 if (f->is_runtime_frame()) {
76 // Skip this frame and try again.
77 RegisterMap temp_map = *reg_map;
78 frame s = f->sender(&temp_map);
79 return new_vframe(&s, &temp_map, thread);
80 }
81 }
82
83 // External frame
84 return new externalVFrame(f, reg_map, thread);
85 }
86
87 vframe* vframe::sender() const {
88 RegisterMap temp_map = *register_map();
89 assert(is_top(), "just checking");
90 if (_fr.is_entry_frame() && _fr.is_first_frame()) return NULL;
91 frame s = _fr.real_sender(&temp_map);
92 if (s.is_first_frame()) return NULL;
93 return vframe::new_vframe(&s, &temp_map, thread());
94 }
95
96 vframe* vframe::top() const {
97 vframe* vf = (vframe*) this;
98 while (!vf->is_top()) vf = vf->sender();
99 return vf;
100 }
101
102
103 javaVFrame* vframe::java_sender() const {
104 vframe* f = sender();
105 while (f != NULL) {
106 if (f->is_java_frame()) return javaVFrame::cast(f);
107 f = f->sender();
108 }
109 return NULL;
110 }
111
112 // ------------- javaVFrame --------------
113
114 GrowableArray<MonitorInfo*>* javaVFrame::locked_monitors() {
115 assert(SafepointSynchronize::is_at_safepoint() || JavaThread::current() == thread(),
116 "must be at safepoint or it's a java frame of the current thread");
117
118 GrowableArray<MonitorInfo*>* mons = monitors();
119 GrowableArray<MonitorInfo*>* result = new GrowableArray<MonitorInfo*>(mons->length());
120 if (mons->is_empty()) return result;
121
122 bool found_first_monitor = false;
123 ObjectMonitor *pending_monitor = thread()->current_pending_monitor();
124 ObjectMonitor *waiting_monitor = thread()->current_waiting_monitor();
125 oop pending_obj = (pending_monitor != NULL ? (oop) pending_monitor->object() : (oop) NULL);
126 oop waiting_obj = (waiting_monitor != NULL ? (oop) waiting_monitor->object() : (oop) NULL);
127
128 for (int index = (mons->length()-1); index >= 0; index--) {
129 MonitorInfo* monitor = mons->at(index);
130 if (monitor->eliminated() && is_compiled_frame()) continue; // skip eliminated monitor
131 oop obj = monitor->owner();
132 if (obj == NULL) continue; // skip unowned monitor
133 //
134 // Skip the monitor that the thread is blocked to enter or waiting on
135 //
136 if (!found_first_monitor && (obj == pending_obj || obj == waiting_obj)) {
137 continue;
138 }
139 found_first_monitor = true;
140 result->append(monitor);
141 }
142 return result;
143 }
144
145 static void print_locked_object_class_name(outputStream* st, Handle obj, const char* lock_state) {
146 if (obj.not_null()) {
147 st->print("\t- %s <" INTPTR_FORMAT "> ", lock_state, (address)obj());
148 if (obj->klass() == SystemDictionary::Class_klass()) {
149 Klass* target_klass = java_lang_Class::as_Klass(obj());
150 st->print_cr("(a java.lang.Class for %s)", InstanceKlass::cast(target_klass)->external_name());
151 } else {
152 Klass* k = obj->klass();
153 st->print_cr("(a %s)", k->external_name());
154 }
155 }
156 }
157
158 void javaVFrame::print_lock_info_on(outputStream* st, int frame_count) {
159 ResourceMark rm;
160
161 // If this is the first frame, and java.lang.Object.wait(...) then print out the receiver.
162 if (frame_count == 0) {
163 if (method()->name() == vmSymbols::wait_name() &&
164 method()->method_holder()->name() == vmSymbols::java_lang_Object()) {
165 StackValueCollection* locs = locals();
166 if (!locs->is_empty()) {
167 StackValue* sv = locs->at(0);
168 if (sv->type() == T_OBJECT) {
169 Handle o = locs->at(0)->get_obj();
170 print_locked_object_class_name(st, o, "waiting on");
171 }
172 }
173 } else if (thread()->current_park_blocker() != NULL) {
174 oop obj = thread()->current_park_blocker();
175 Klass* k = obj->klass();
176 st->print_cr("\t- %s <" INTPTR_FORMAT "> (a %s)", "parking to wait for ", (address)obj, k->external_name());
177 }
178 }
179
180
181 // Print out all monitors that we have locked or are trying to lock
182 GrowableArray<MonitorInfo*>* mons = monitors();
183 if (!mons->is_empty()) {
184 bool found_first_monitor = false;
185 for (int index = (mons->length()-1); index >= 0; index--) {
186 MonitorInfo* monitor = mons->at(index);
187 if (monitor->eliminated() && is_compiled_frame()) { // Eliminated in compiled code
188 if (monitor->owner_is_scalar_replaced()) {
189 Klass* k = java_lang_Class::as_Klass(monitor->owner_klass());
190 st->print("\t- eliminated <owner is scalar replaced> (a %s)", k->external_name());
191 } else {
192 oop obj = monitor->owner();
193 if (obj != NULL) {
194 print_locked_object_class_name(st, obj, "eliminated");
195 }
196 }
197 continue;
198 }
199 if (monitor->owner() != NULL) {
200
201 // First, assume we have the monitor locked. If we haven't found an
202 // owned monitor before and this is the first frame, then we need to
203 // see if we have completed the lock or we are blocked trying to
204 // acquire it - we can only be blocked if the monitor is inflated
205
206 const char *lock_state = "locked"; // assume we have the monitor locked
207 if (!found_first_monitor && frame_count == 0) {
208 markOop mark = monitor->owner()->mark();
209 if (mark->has_monitor() &&
210 mark->monitor() == thread()->current_pending_monitor()) {
211 lock_state = "waiting to lock";
212 }
213 }
214
215 found_first_monitor = true;
216 print_locked_object_class_name(st, monitor->owner(), lock_state);
217 }
218 }
219 }
220 }
221
222 // ------------- interpretedVFrame --------------
223
224 u_char* interpretedVFrame::bcp() const {
225 return fr().interpreter_frame_bcp();
226 }
227
228 void interpretedVFrame::set_bcp(u_char* bcp) {
229 fr().interpreter_frame_set_bcp(bcp);
230 }
231
232 intptr_t* interpretedVFrame::locals_addr_at(int offset) const {
233 assert(fr().is_interpreted_frame(), "frame should be an interpreted frame");
234 return fr().interpreter_frame_local_at(offset);
235 }
236
237
238 GrowableArray<MonitorInfo*>* interpretedVFrame::monitors() const {
239 GrowableArray<MonitorInfo*>* result = new GrowableArray<MonitorInfo*>(5);
240 for (BasicObjectLock* current = (fr().previous_monitor_in_interpreter_frame(fr().interpreter_frame_monitor_begin()));
241 current >= fr().interpreter_frame_monitor_end();
242 current = fr().previous_monitor_in_interpreter_frame(current)) {
243 result->push(new MonitorInfo(current->obj(), current->lock(), false, false));
244 }
245 return result;
246 }
247
248 int interpretedVFrame::bci() const {
249 return method()->bci_from(bcp());
250 }
251
252 Method* interpretedVFrame::method() const {
253 return fr().interpreter_frame_method();
254 }
255
256 StackValueCollection* interpretedVFrame::locals() const {
257 int length = method()->max_locals();
258
259 if (method()->is_native()) {
260 // If the method is native, max_locals is not telling the truth.
261 // maxlocals then equals the size of parameters
262 length = method()->size_of_parameters();
263 }
264
265 StackValueCollection* result = new StackValueCollection(length);
266
267 // Get oopmap describing oops and int for current bci
268 InterpreterOopMap oop_mask;
269 if (TraceDeoptimization && Verbose) {
270 methodHandle m_h(thread(), method());
271 OopMapCache::compute_one_oop_map(m_h, bci(), &oop_mask);
272 } else {
273 method()->mask_for(bci(), &oop_mask);
274 }
275 // handle locals
276 for(int i=0; i < length; i++) {
277 // Find stack location
278 intptr_t *addr = locals_addr_at(i);
279
280 // Depending on oop/int put it in the right package
281 StackValue *sv;
282 if (oop_mask.is_oop(i)) {
283 // oop value
284 Handle h(*(oop *)addr);
285 sv = new StackValue(h);
286 } else {
287 // integer
288 sv = new StackValue(*addr);
289 }
290 assert(sv != NULL, "sanity check");
291 result->add(sv);
292 }
293 return result;
294 }
295
296 void interpretedVFrame::set_locals(StackValueCollection* values) const {
297 if (values == NULL || values->size() == 0) return;
298
299 int length = method()->max_locals();
300 if (method()->is_native()) {
301 // If the method is native, max_locals is not telling the truth.
302 // maxlocals then equals the size of parameters
303 length = method()->size_of_parameters();
304 }
305
306 assert(length == values->size(), "Mismatch between actual stack format and supplied data");
307
308 // handle locals
309 for (int i = 0; i < length; i++) {
310 // Find stack location
311 intptr_t *addr = locals_addr_at(i);
312
313 // Depending on oop/int put it in the right package
314 StackValue *sv = values->at(i);
315 assert(sv != NULL, "sanity check");
316 if (sv->type() == T_OBJECT) {
317 *(oop *) addr = (sv->get_obj())();
318 } else { // integer
319 *addr = sv->get_int();
320 }
321 }
322 }
323
324 StackValueCollection* interpretedVFrame::expressions() const {
325
326 int length = 0;
327 InterpreterOopMap oop_mask;
328
329 if (!method()->is_native()) {
330 // Get oopmap describing oops and int for current bci
331 if (TraceDeoptimization && Verbose) {
332 methodHandle m_h(method());
333 OopMapCache::compute_one_oop_map(m_h, bci(), &oop_mask);
334 } else {
335 method()->mask_for(bci(), &oop_mask);
336 }
337
338 length = oop_mask.expression_stack_size();
339 }
340
341 StackValueCollection* result = new StackValueCollection(length);
342
343 if (0 == length) {
344 return result;
345 }
346
347 int nof_locals = method()->max_locals();
348
349 // handle expressions
350 for(int i=0; i < length; i++) {
351 // Find stack location
352 intptr_t *addr = fr().interpreter_frame_expression_stack_at(i);
353
354 // Depending on oop/int put it in the right package
355 StackValue *sv;
356 if (oop_mask.is_oop(i + nof_locals)) {
357 // oop value
358 Handle h(*(oop *)addr);
359 sv = new StackValue(h);
360 } else {
361 // integer
362 sv = new StackValue(*addr);
363 }
364 assert(sv != NULL, "sanity check");
365 result->add(sv);
366 }
367 return result;
368 }
369
370
371 // ------------- cChunk --------------
372
373 entryVFrame::entryVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread)
374 : externalVFrame(fr, reg_map, thread) {}
375
376
377 void vframeStreamCommon::found_bad_method_frame() {
378 // 6379830 Cut point for an assertion that occasionally fires when
379 // we are using the performance analyzer.
380 // Disable this assert when testing the analyzer with fastdebug.
381 // -XX:SuppressErrorAt=vframe.cpp:XXX (XXX=following line number)
382 assert(false, "invalid bci or invalid scope desc");
383 }
384
385 // top-frame will be skipped
386 vframeStream::vframeStream(JavaThread* thread, frame top_frame,
387 bool stop_at_java_call_stub) : vframeStreamCommon(thread) {
388 _stop_at_java_call_stub = stop_at_java_call_stub;
389
390 // skip top frame, as it may not be at safepoint
391 _frame = top_frame.sender(&_reg_map);
392 while (!fill_from_frame()) {
393 _frame = _frame.sender(&_reg_map);
394 }
395 }
396
397
398 // Step back n frames, skip any pseudo frames in between.
399 // This function is used in Class.forName, Class.newInstance, Method.Invoke,
400 // AccessController.doPrivileged.
401 void vframeStreamCommon::security_get_caller_frame(int depth) {
402 assert(depth >= 0, err_msg("invalid depth: %d", depth));
403 for (int n = 0; !at_end(); security_next()) {
404 if (!method()->is_ignored_by_security_stack_walk()) {
405 if (n == depth) {
406 // We have reached the desired depth; return.
407 return;
408 }
409 n++; // this is a non-skipped frame; count it against the depth
410 }
411 }
412 // NOTE: At this point there were not enough frames on the stack
413 // to walk to depth. Callers of this method have to check for at_end.
414 }
415
416
417 void vframeStreamCommon::security_next() {
418 if (method()->is_prefixed_native()) {
419 skip_prefixed_method_and_wrappers(); // calls next()
420 } else {
421 next();
422 }
423 }
424
425
426 void vframeStreamCommon::skip_prefixed_method_and_wrappers() {
427 ResourceMark rm;
428 HandleMark hm;
429
430 int method_prefix_count = 0;
431 char** method_prefixes = JvmtiExport::get_all_native_method_prefixes(&method_prefix_count);
432 KlassHandle prefixed_klass(method()->method_holder());
433 const char* prefixed_name = method()->name()->as_C_string();
434 size_t prefixed_name_len = strlen(prefixed_name);
435 int prefix_index = method_prefix_count-1;
436
437 while (!at_end()) {
438 next();
439 if (method()->method_holder() != prefixed_klass()) {
440 break; // classes don't match, can't be a wrapper
441 }
442 const char* name = method()->name()->as_C_string();
443 size_t name_len = strlen(name);
444 size_t prefix_len = prefixed_name_len - name_len;
445 if (prefix_len <= 0 || strcmp(name, prefixed_name + prefix_len) != 0) {
446 break; // prefixed name isn't prefixed version of method name, can't be a wrapper
447 }
448 for (; prefix_index >= 0; --prefix_index) {
449 const char* possible_prefix = method_prefixes[prefix_index];
450 size_t possible_prefix_len = strlen(possible_prefix);
451 if (possible_prefix_len == prefix_len &&
452 strncmp(possible_prefix, prefixed_name, prefix_len) == 0) {
453 break; // matching prefix found
454 }
455 }
456 if (prefix_index < 0) {
457 break; // didn't find the prefix, can't be a wrapper
458 }
459 prefixed_name = name;
460 prefixed_name_len = name_len;
461 }
462 }
463
464
465 void vframeStreamCommon::skip_reflection_related_frames() {
466 while (!at_end() &&
467 (JDK_Version::is_gte_jdk14x_version() && UseNewReflection &&
468 (method()->method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass()) ||
469 method()->method_holder()->is_subclass_of(SystemDictionary::reflect_ConstructorAccessorImpl_klass())))) {
470 next();
471 }
472 }
473
474
475 #ifndef PRODUCT
476 void vframe::print() {
477 if (WizardMode) _fr.print_value_on(tty,NULL);
478 }
479
480
481 void vframe::print_value() const {
482 ((vframe*)this)->print();
483 }
484
485
486 void entryVFrame::print_value() const {
487 ((entryVFrame*)this)->print();
488 }
489
490 void entryVFrame::print() {
491 vframe::print();
492 tty->print_cr("C Chunk inbetween Java");
493 tty->print_cr("C link " INTPTR_FORMAT, _fr.link());
494 }
495
496
497 // ------------- javaVFrame --------------
498
499 static void print_stack_values(const char* title, StackValueCollection* values) {
500 if (values->is_empty()) return;
501 tty->print_cr("\t%s:", title);
502 values->print();
503 }
504
505
506 void javaVFrame::print() {
507 ResourceMark rm;
508 vframe::print();
509 tty->print("\t");
510 method()->print_value();
511 tty->cr();
512 tty->print_cr("\tbci: %d", bci());
513
514 print_stack_values("locals", locals());
515 print_stack_values("expressions", expressions());
516
517 GrowableArray<MonitorInfo*>* list = monitors();
518 if (list->is_empty()) return;
519 tty->print_cr("\tmonitor list:");
520 for (int index = (list->length()-1); index >= 0; index--) {
521 MonitorInfo* monitor = list->at(index);
522 tty->print("\t obj\t");
523 if (monitor->owner_is_scalar_replaced()) {
524 Klass* k = java_lang_Class::as_Klass(monitor->owner_klass());
525 tty->print("( is scalar replaced %s)", k->external_name());
526 } else if (monitor->owner() == NULL) {
527 tty->print("( null )");
528 } else {
529 monitor->owner()->print_value();
530 tty->print("(" INTPTR_FORMAT ")", (address)monitor->owner());
531 }
532 if (monitor->eliminated() && is_compiled_frame())
533 tty->print(" ( lock is eliminated )");
534 tty->cr();
535 tty->print("\t ");
536 monitor->lock()->print_on(tty);
537 tty->cr();
538 }
539 }
540
541
542 void javaVFrame::print_value() const {
543 Method* m = method();
544 InstanceKlass* k = m->method_holder();
545 tty->print_cr("frame( sp=" INTPTR_FORMAT ", unextended_sp=" INTPTR_FORMAT ", fp=" INTPTR_FORMAT ", pc=" INTPTR_FORMAT ")",
546 _fr.sp(), _fr.unextended_sp(), _fr.fp(), _fr.pc());
547 tty->print("%s.%s", k->internal_name(), m->name()->as_C_string());
548
549 if (!m->is_native()) {
550 Symbol* source_name = k->source_file_name();
551 int line_number = m->line_number_from_bci(bci());
552 if (source_name != NULL && (line_number != -1)) {
553 tty->print("(%s:%d)", source_name->as_C_string(), line_number);
554 }
555 } else {
556 tty->print("(Native Method)");
557 }
558 // Check frame size and print warning if it looks suspiciously large
559 if (fr().sp() != NULL) {
560 RegisterMap map = *register_map();
561 uint size = fr().frame_size(&map);
562 #ifdef _LP64
563 if (size > 8*K) warning("SUSPICIOUSLY LARGE FRAME (%d)", size);
564 #else
565 if (size > 4*K) warning("SUSPICIOUSLY LARGE FRAME (%d)", size);
566 #endif
567 }
568 }
569
570
571 bool javaVFrame::structural_compare(javaVFrame* other) {
572 // Check static part
573 if (method() != other->method()) return false;
574 if (bci() != other->bci()) return false;
575
576 // Check locals
577 StackValueCollection *locs = locals();
578 StackValueCollection *other_locs = other->locals();
579 assert(locs->size() == other_locs->size(), "sanity check");
580 int i;
581 for(i = 0; i < locs->size(); i++) {
582 // it might happen the compiler reports a conflict and
583 // the interpreter reports a bogus int.
584 if ( is_compiled_frame() && locs->at(i)->type() == T_CONFLICT) continue;
585 if (other->is_compiled_frame() && other_locs->at(i)->type() == T_CONFLICT) continue;
586
587 if (!locs->at(i)->equal(other_locs->at(i)))
588 return false;
589 }
590
591 // Check expressions
592 StackValueCollection* exprs = expressions();
593 StackValueCollection* other_exprs = other->expressions();
594 assert(exprs->size() == other_exprs->size(), "sanity check");
595 for(i = 0; i < exprs->size(); i++) {
596 if (!exprs->at(i)->equal(other_exprs->at(i)))
597 return false;
598 }
599
600 return true;
601 }
602
603
604 void javaVFrame::print_activation(int index) const {
605 // frame number and method
606 tty->print("%2d - ", index);
607 ((vframe*)this)->print_value();
608 tty->cr();
609
610 if (WizardMode) {
611 ((vframe*)this)->print();
612 tty->cr();
613 }
614 }
615
616
617 void javaVFrame::verify() const {
618 }
619
620
621 void interpretedVFrame::verify() const {
622 }
623
624
625 // ------------- externalVFrame --------------
626
627 void externalVFrame::print() {
628 _fr.print_value_on(tty,NULL);
629 }
630
631
632 void externalVFrame::print_value() const {
633 ((vframe*)this)->print();
634 }
635 #endif // PRODUCT