1 /*
  2  * Copyright (c) 1997, 2024, 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.inline.hpp"
 27 #include "classfile/javaThreadStatus.hpp"
 28 #include "classfile/vmClasses.hpp"
 29 #include "classfile/vmSymbols.hpp"
 30 #include "code/codeCache.hpp"
 31 #include "code/debugInfoRec.hpp"
 32 #include "code/nmethod.hpp"
 33 #include "code/pcDesc.hpp"
 34 #include "code/scopeDesc.hpp"
 35 #include "interpreter/interpreter.hpp"
 36 #include "interpreter/oopMapCache.hpp"
 37 #include "memory/resourceArea.hpp"
 38 #include "oops/instanceKlass.hpp"
 39 #include "oops/method.inline.hpp"
 40 #include "oops/oop.inline.hpp"
 41 #include "oops/stackChunkOop.hpp"
 42 #include "prims/jvmtiExport.hpp"
 43 #include "runtime/frame.inline.hpp"
 44 #include "runtime/globals.hpp"
 45 #include "runtime/handles.inline.hpp"
 46 #include "runtime/javaThread.inline.hpp"
 47 #include "runtime/objectMonitor.hpp"
 48 #include "runtime/objectMonitor.inline.hpp"
 49 #include "runtime/osThread.hpp"
 50 #include "runtime/signature.hpp"
 51 #include "runtime/stackFrameStream.inline.hpp"
 52 #include "runtime/stubRoutines.hpp"
 53 #include "runtime/synchronizer.hpp"
 54 #include "runtime/vframe.inline.hpp"
 55 #include "runtime/vframeArray.hpp"
 56 #include "runtime/vframe_hp.hpp"
 57 
 58 vframe::vframe(const frame* fr, const RegisterMap* reg_map, JavaThread* thread)
 59 : _reg_map(reg_map), _thread(thread),
 60   _chunk(Thread::current(), reg_map->stack_chunk()()) {
 61   assert(fr != nullptr, "must have frame");
 62   _fr = *fr;
 63 }
 64 
 65 vframe* vframe::new_vframe(const frame* f, const RegisterMap* reg_map, JavaThread* thread) {
 66   // Interpreter frame
 67   if (f->is_interpreted_frame()) {
 68     return new interpretedVFrame(f, reg_map, thread);
 69   }
 70 
 71   // Compiled frame
 72   CodeBlob* cb = f->cb();
 73   if (cb != nullptr) {
 74     if (cb->is_nmethod()) {
 75       nmethod* nm = cb->as_nmethod();
 76       return new compiledVFrame(f, reg_map, thread, nm);
 77     }
 78 
 79     if (f->is_runtime_frame()) {
 80       // Skip this frame and try again.
 81       RegisterMap temp_map = *reg_map;
 82       frame s = f->sender(&temp_map);
 83       return new_vframe(&s, &temp_map, thread);
 84     }
 85   }
 86 
 87   // Entry frame
 88   if (f->is_entry_frame()) {
 89     return new entryVFrame(f, reg_map, thread);
 90   }
 91 
 92   // External frame
 93   return new externalVFrame(f, reg_map, thread);
 94 }
 95 
 96 vframe* vframe::sender() const {
 97   RegisterMap temp_map = *register_map();
 98   assert(is_top(), "just checking");
 99   if (_fr.is_empty()) return nullptr;
100   if (_fr.is_entry_frame() && _fr.is_first_frame()) return nullptr;
101   frame s = _fr.real_sender(&temp_map);
102   if (s.is_first_frame()) return nullptr;
103   return vframe::new_vframe(&s, &temp_map, thread());
104 }
105 
106 bool vframe::is_vthread_entry() const {
107   return _fr.is_first_vthread_frame(register_map()->thread());
108 }
109 
110 javaVFrame* vframe::java_sender() const {
111   vframe* f = sender();
112   while (f != nullptr) {
113     if (f->is_vthread_entry()) break;
114     if (f->is_java_frame() && !javaVFrame::cast(f)->method()->is_continuation_enter_intrinsic())
115       return javaVFrame::cast(f);
116     f = f->sender();
117   }
118   return nullptr;
119 }
120 
121 // ------------- javaVFrame --------------
122 
123 GrowableArray<MonitorInfo*>* javaVFrame::locked_monitors() {
124   assert(SafepointSynchronize::is_at_safepoint() || JavaThread::current() == thread(),
125          "must be at safepoint or it's a java frame of the current thread");
126 
127   GrowableArray<MonitorInfo*>* mons = monitors();
128   GrowableArray<MonitorInfo*>* result = new GrowableArray<MonitorInfo*>(mons->length());
129   if (mons->is_empty()) return result;
130 
131   bool found_first_monitor = false;
132   // The ObjectMonitor* can't be async deflated since we are either
133   // at a safepoint or the calling thread is operating on itself so
134   // it cannot exit the ObjectMonitor so it remains busy.
135   ObjectMonitor *waiting_monitor = thread()->current_waiting_monitor();
136   ObjectMonitor *pending_monitor = nullptr;
137   if (waiting_monitor == nullptr) {
138     pending_monitor = thread()->current_pending_monitor();
139   }
140   oop pending_obj = (pending_monitor != nullptr ? pending_monitor->object() : (oop) nullptr);
141   oop waiting_obj = (waiting_monitor != nullptr ? waiting_monitor->object() : (oop) nullptr);
142 
143   for (int index = (mons->length()-1); index >= 0; index--) {
144     MonitorInfo* monitor = mons->at(index);
145     if (monitor->eliminated() && is_compiled_frame()) continue; // skip eliminated monitor
146     oop obj = monitor->owner();
147     if (obj == nullptr) continue; // skip unowned monitor
148     //
149     // Skip the monitor that the thread is blocked to enter or waiting on
150     //
151     if (!found_first_monitor && (obj == pending_obj || obj == waiting_obj)) {
152       continue;
153     }
154     found_first_monitor = true;
155     result->append(monitor);
156   }
157   return result;
158 }
159 
160 void javaVFrame::print_locked_object_class_name(outputStream* st, Handle obj, const char* lock_state) {
161   if (obj.not_null()) {
162     st->print("\t- %s <" INTPTR_FORMAT "> ", lock_state, p2i(obj()));
163     if (obj->klass() == vmClasses::Class_klass()) {
164       st->print_cr("(a java.lang.Class for %s)", java_lang_Class::as_external_name(obj()));
165     } else {
166       Klass* k = obj->klass();
167       st->print_cr("(a %s)", k->external_name());
168     }
169   }
170 }
171 
172 void javaVFrame::print_lock_info_on(outputStream* st, int frame_count) {
173   Thread* current = Thread::current();
174   ResourceMark rm(current);
175   HandleMark hm(current);
176 
177   // If this is the first frame and it is java.lang.Object.wait(...)
178   // then print out the receiver. Locals are not always available,
179   // e.g., compiled native frames have no scope so there are no locals.
180   if (frame_count == 0) {
181     if (method()->name() == vmSymbols::wait_name() &&
182         method()->method_holder()->name() == vmSymbols::java_lang_Object()) {
183       const char *wait_state = "waiting on"; // assume we are waiting
184       // If earlier in the output we reported java.lang.Thread.State ==
185       // "WAITING (on object monitor)" and now we report "waiting on", then
186       // we are still waiting for notification or timeout. Otherwise if
187       // we earlier reported java.lang.Thread.State == "BLOCKED (on object
188       // monitor)", then we are actually waiting to re-lock the monitor.
189       StackValueCollection* locs = locals();
190       if (!locs->is_empty()) {
191         StackValue* sv = locs->at(0);
192         if (sv->type() == T_OBJECT) {
193           Handle o = locs->at(0)->get_obj();
194           if (java_lang_Thread::get_thread_status(thread()->threadObj()) ==
195                                 JavaThreadStatus::BLOCKED_ON_MONITOR_ENTER) {
196             wait_state = "waiting to re-lock in wait()";
197           }
198           print_locked_object_class_name(st, o, wait_state);
199         }
200       } else {
201         st->print_cr("\t- %s <no object reference available>", wait_state);
202       }
203     } else if (thread()->current_park_blocker() != nullptr) {
204       oop obj = thread()->current_park_blocker();
205       Klass* k = obj->klass();
206       st->print_cr("\t- %s <" INTPTR_FORMAT "> (a %s)", "parking to wait for ", p2i(obj), k->external_name());
207     }
208     else if (thread()->osthread()->get_state() == CONDVAR_WAIT) {
209       // We are waiting on the native class initialization monitor.
210       InstanceKlass* k = thread()->class_to_be_initialized();
211       if (k != nullptr) {
212         st->print_cr("\t- waiting on the Class initialization monitor for %s", k->external_name());
213       }
214     }
215   }
216 
217   // Print out all monitors that we have locked, or are trying to lock,
218   // including re-locking after being notified or timing out in a wait().
219   GrowableArray<MonitorInfo*>* mons = monitors();
220   if (!mons->is_empty()) {
221     bool found_first_monitor = false;
222     for (int index = (mons->length()-1); index >= 0; index--) {
223       MonitorInfo* monitor = mons->at(index);
224       if (monitor->eliminated() && is_compiled_frame()) { // Eliminated in compiled code
225         if (monitor->owner_is_scalar_replaced()) {
226           Klass* k = java_lang_Class::as_Klass(monitor->owner_klass());
227           st->print_cr("\t- eliminated <owner is scalar replaced> (a %s)", k->external_name());
228         } else {
229           Handle obj(current, monitor->owner());
230           if (obj() != nullptr) {
231             print_locked_object_class_name(st, obj, "eliminated");
232           }
233         }
234         continue;
235       }
236       if (monitor->owner() != nullptr) {
237         // the monitor is associated with an object, i.e., it is locked
238 
239         const char *lock_state = "locked"; // assume we have the monitor locked
240         if (!found_first_monitor && frame_count == 0) {
241           // If this is the first frame and we haven't found an owned
242           // monitor before, then we need to see if we have completed
243           // the lock or if we are blocked trying to acquire it. Only
244           // an inflated monitor that is first on the monitor list in
245           // the first frame can block us on a monitor enter.
246           markWord mark = monitor->owner()->mark();
247           // The first stage of async deflation does not affect any field
248           // used by this comparison so the ObjectMonitor* is usable here.
249           if (mark.has_monitor() &&
250               ( // we have marked ourself as pending on this monitor
251                 mark.monitor() == thread()->current_pending_monitor() ||
252                 // we are not the owner of this monitor
253                 !mark.monitor()->is_entered(thread())
254               )) {
255             lock_state = "waiting to lock";
256           }
257         }
258         print_locked_object_class_name(st, Handle(current, monitor->owner()), lock_state);
259 
260         found_first_monitor = true;
261       }
262     }
263   }
264 }
265 
266 // ------------- interpretedVFrame --------------
267 
268 u_char* interpretedVFrame::bcp() const {
269   return stack_chunk() == nullptr ? fr().interpreter_frame_bcp() : stack_chunk()->interpreter_frame_bcp(fr());
270 }
271 
272 intptr_t* interpretedVFrame::locals_addr_at(int offset) const {
273   assert(stack_chunk() == nullptr, "Not supported for heap frames"); // unsupported for now because seems to be unused
274   assert(fr().is_interpreted_frame(), "frame should be an interpreted frame");
275   return fr().interpreter_frame_local_at(offset);
276 }
277 
278 GrowableArray<MonitorInfo*>* interpretedVFrame::monitors() const {


279   GrowableArray<MonitorInfo*>* result = new GrowableArray<MonitorInfo*>(5);
280   if (stack_chunk() == nullptr) { // no monitors in continuations
281     for (BasicObjectLock* current = (fr().previous_monitor_in_interpreter_frame(fr().interpreter_frame_monitor_begin()));
282         current >= fr().interpreter_frame_monitor_end();
283         current = fr().previous_monitor_in_interpreter_frame(current)) {
284       result->push(new MonitorInfo(current->obj(), current->lock(), false, false));
285     }
286   }
287   return result;
288 }
289 
290 int interpretedVFrame::bci() const {
291   return method()->bci_from(bcp());
292 }
293 
294 Method* interpretedVFrame::method() const {
295   return stack_chunk() == nullptr ? fr().interpreter_frame_method() : stack_chunk()->interpreter_frame_method(fr());
296 }
297 
298 static StackValue* create_stack_value_from_oop_map(const InterpreterOopMap& oop_mask,
299                                                    int index,
300                                                    const intptr_t* const addr,
301                                                    stackChunkOop chunk) {
302 
303   assert(index >= 0 && index < oop_mask.number_of_entries(), "invariant");
304 
305   // categorize using oop_mask
306   if (oop_mask.is_oop(index)) {
307     return StackValue::create_stack_value_from_oop_location(chunk, (void*)addr);
308   }
309   // value (integer) "v"
310   return new StackValue(addr != nullptr ? *addr : 0);
311 }
312 
313 static bool is_in_expression_stack(const frame& fr, const intptr_t* const addr) {
314   assert(addr != nullptr, "invariant");
315 
316   // Ensure to be 'inside' the expression stack (i.e., addr >= sp for Intel).
317   // In case of exceptions, the expression stack is invalid and the sp
318   // will be reset to express this condition.
319   if (frame::interpreter_frame_expression_stack_direction() > 0) {
320     return addr <= fr.interpreter_frame_tos_address();
321   }
322 
323   return addr >= fr.interpreter_frame_tos_address();
324 }
325 
326 static void stack_locals(StackValueCollection* result,
327                          int length,
328                          const InterpreterOopMap& oop_mask,
329                          const frame& fr,
330                          const stackChunkOop chunk) {
331 
332   assert(result != nullptr, "invariant");
333 
334   for (int i = 0; i < length; ++i) {
335     const intptr_t* addr;
336     if (chunk == nullptr) {
337       addr = fr.interpreter_frame_local_at(i);
338       assert(addr >= fr.sp(), "must be inside the frame");
339     } else {
340       addr = chunk->interpreter_frame_local_at(fr, i);
341     }
342     assert(addr != nullptr, "invariant");
343 
344     StackValue* const sv = create_stack_value_from_oop_map(oop_mask, i, addr, chunk);
345     assert(sv != nullptr, "sanity check");
346 
347     result->add(sv);
348   }
349 }
350 
351 static void stack_expressions(StackValueCollection* result,
352                               int length,
353                               int max_locals,
354                               const InterpreterOopMap& oop_mask,
355                               const frame& fr,
356                               const stackChunkOop chunk) {
357 
358   assert(result != nullptr, "invariant");
359 
360   for (int i = 0; i < length; ++i) {
361     const intptr_t* addr;
362     if (chunk == nullptr) {
363       addr = fr.interpreter_frame_expression_stack_at(i);
364       assert(addr != nullptr, "invariant");
365       if (!is_in_expression_stack(fr, addr)) {
366         // Need to ensure no bogus escapes.
367         addr = nullptr;
368       }
369     } else {
370       addr = chunk->interpreter_frame_expression_stack_at(fr, i);
371     }
372 
373     StackValue* const sv = create_stack_value_from_oop_map(oop_mask,
374                                                            i + max_locals,
375                                                            addr,
376                                                            chunk);
377     assert(sv != nullptr, "sanity check");
378 
379     result->add(sv);
380   }
381 }
382 
383 StackValueCollection* interpretedVFrame::locals() const {
384   return stack_data(false);
385 }
386 
387 StackValueCollection* interpretedVFrame::expressions() const {
388   return stack_data(true);
389 }
390 
391 /*
392  * Worker routine for fetching references and/or values
393  * for a particular bci in the interpretedVFrame.
394  *
395  * Returns data for either "locals" or "expressions",
396  * using bci relative oop_map (oop_mask) information.
397  *
398  * @param expressions  bool switch controlling what data to return
399                        (false == locals / true == expression)
400  *
401  */
402 StackValueCollection* interpretedVFrame::stack_data(bool expressions) const {
403 
404   InterpreterOopMap oop_mask;
405   method()->mask_for(bci(), &oop_mask);
406   const int mask_len = oop_mask.number_of_entries();
407 
408   // If the method is native, method()->max_locals() is not telling the truth.
409   // For our purposes, max locals instead equals the size of parameters.
410   const int max_locals = method()->is_native() ?
411     method()->size_of_parameters() : method()->max_locals();
412 
413   assert(mask_len >= max_locals, "invariant");
414 
415   const int length = expressions ? mask_len - max_locals : max_locals;
416   assert(length >= 0, "invariant");
417 
418   StackValueCollection* const result = new StackValueCollection(length);
419 
420   if (0 == length) {
421     return result;
422   }
423 
424   if (expressions) {
425     stack_expressions(result, length, max_locals, oop_mask, fr(), stack_chunk());
426   } else {
427     stack_locals(result, length, oop_mask, fr(), stack_chunk());
428   }
429 
430   assert(length == result->size(), "invariant");
431 
432   return result;
433 }
434 
435 void interpretedVFrame::set_locals(StackValueCollection* values) const {
436   if (values == nullptr || values->size() == 0) return;
437 
438   // If the method is native, max_locals is not telling the truth.
439   // maxlocals then equals the size of parameters
440   const int max_locals = method()->is_native() ?
441     method()->size_of_parameters() : method()->max_locals();
442 
443   assert(max_locals == values->size(), "Mismatch between actual stack format and supplied data");
444 
445   // handle locals
446   for (int i = 0; i < max_locals; i++) {
447     // Find stack location
448     intptr_t *addr = locals_addr_at(i);
449 
450     // Depending on oop/int put it in the right package
451     const StackValue* const sv = values->at(i);
452     assert(sv != nullptr, "sanity check");
453     if (sv->type() == T_OBJECT) {
454       *(oop *) addr = (sv->get_obj())();
455     } else {                   // integer
456       *addr = sv->get_intptr();
457     }
458   }
459 }
460 
461 // ------------- cChunk --------------
462 
463 entryVFrame::entryVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread)
464 : externalVFrame(fr, reg_map, thread) {}
465 
466 MonitorInfo::MonitorInfo(oop owner, BasicLock* lock, bool eliminated, bool owner_is_scalar_replaced) {
467   Thread* thread = Thread::current();
468   if (!owner_is_scalar_replaced) {
469     _owner = Handle(thread, owner);
470     _owner_klass = Handle();
471   } else {
472     assert(eliminated, "monitor should be eliminated for scalar replaced object");
473     _owner = Handle();
474     _owner_klass = Handle(thread, owner);
475   }
476   _lock = lock;
477   _eliminated = eliminated;
478   _owner_is_scalar_replaced = owner_is_scalar_replaced;
479 }
480 
481 #ifdef ASSERT
482 void vframeStreamCommon::found_bad_method_frame() const {
483   // 6379830 Cut point for an assertion that occasionally fires when
484   // we are using the performance analyzer.
485   // Disable this when testing the analyzer with fastdebug.
486   fatal("invalid bci or invalid scope desc");
487 }
488 #endif
489 
490 vframeStream::vframeStream(JavaThread* thread, Handle continuation_scope, bool stop_at_java_call_stub)
491  : vframeStreamCommon(RegisterMap(thread,
492                                   RegisterMap::UpdateMap::include,
493                                   RegisterMap::ProcessFrames::include,
494                                   RegisterMap::WalkContinuation::include)) {
495 
496   _stop_at_java_call_stub = stop_at_java_call_stub;
497   _continuation_scope = continuation_scope;
498 
499   if (!thread->has_last_Java_frame()) {
500     _mode = at_end_mode;
501     return;
502   }
503 
504   _frame = _thread->last_frame();
505   _cont_entry = _thread->last_continuation();
506   while (!fill_from_frame()) {
507     _frame = _frame.sender(&_reg_map);
508   }
509 }
510 
511 vframeStream::vframeStream(oop continuation, Handle continuation_scope)
512  : vframeStreamCommon(RegisterMap(continuation, RegisterMap::UpdateMap::include)) {
513 
514   _stop_at_java_call_stub = false;
515   _continuation_scope = continuation_scope;
516 
517   if (!Continuation::has_last_Java_frame(continuation, &_frame, &_reg_map)) {
518     _mode = at_end_mode;
519     return;
520   }
521 
522   // _chunk = _reg_map.stack_chunk();
523   while (!fill_from_frame()) {
524     _frame = _frame.sender(&_reg_map);
525   }
526 }
527 
528 
529 // Step back n frames, skip any pseudo frames in between.
530 // This function is used in Class.forName, Class.newInstance, Method.Invoke,
531 // AccessController.doPrivileged.
532 void vframeStreamCommon::security_get_caller_frame(int depth) {
533   assert(depth >= 0, "invalid depth: %d", depth);
534   for (int n = 0; !at_end(); security_next()) {
535     if (!method()->is_ignored_by_security_stack_walk()) {
536       if (n == depth) {
537         // We have reached the desired depth; return.
538         return;
539       }
540       n++;  // this is a non-skipped frame; count it against the depth
541     }
542   }
543   // NOTE: At this point there were not enough frames on the stack
544   // to walk to depth.  Callers of this method have to check for at_end.
545 }
546 
547 
548 void vframeStreamCommon::security_next() {
549   if (method()->is_prefixed_native()) {
550     skip_prefixed_method_and_wrappers();  // calls next()
551   } else {
552     next();
553   }
554 }
555 
556 
557 void vframeStreamCommon::skip_prefixed_method_and_wrappers() {
558   ResourceMark rm;
559 
560   int    method_prefix_count = 0;
561   char** method_prefixes = JvmtiExport::get_all_native_method_prefixes(&method_prefix_count);
562   Klass* prefixed_klass = method()->method_holder();
563   const char* prefixed_name = method()->name()->as_C_string();
564   size_t prefixed_name_len = strlen(prefixed_name);
565   int prefix_index = method_prefix_count-1;
566 
567   while (!at_end()) {
568     next();
569     if (method()->method_holder() != prefixed_klass) {
570       break; // classes don't match, can't be a wrapper
571     }
572     const char* name = method()->name()->as_C_string();
573     size_t name_len = strlen(name);
574     size_t prefix_len = prefixed_name_len - name_len;
575     if (prefix_len <= 0 || strcmp(name, prefixed_name + prefix_len) != 0) {
576       break; // prefixed name isn't prefixed version of method name, can't be a wrapper
577     }
578     for (; prefix_index >= 0; --prefix_index) {
579       const char* possible_prefix = method_prefixes[prefix_index];
580       size_t possible_prefix_len = strlen(possible_prefix);
581       if (possible_prefix_len == prefix_len &&
582           strncmp(possible_prefix, prefixed_name, prefix_len) == 0) {
583         break; // matching prefix found
584       }
585     }
586     if (prefix_index < 0) {
587       break; // didn't find the prefix, can't be a wrapper
588     }
589     prefixed_name = name;
590     prefixed_name_len = name_len;
591   }
592 }
593 
594 javaVFrame* vframeStreamCommon::asJavaVFrame() {
595   javaVFrame* result = nullptr;
596   // FIXME, need to re-do JDK-8271140 and check is_native_frame?
597   if (_mode == compiled_mode && _frame.is_compiled_frame()) {
598     assert(_frame.is_compiled_frame() || _frame.is_native_frame(), "expected compiled Java frame");
599     guarantee(_reg_map.update_map(), "");
600 
601     compiledVFrame* cvf = compiledVFrame::cast(vframe::new_vframe(&_frame, &_reg_map, _thread));
602 
603     guarantee(cvf->cb() == cb(), "wrong code blob");
604 
605     cvf = cvf->at_scope(_decode_offset, _vframe_id); // get the same scope as this stream
606 
607     guarantee(cvf->scope()->decode_offset() == _decode_offset, "wrong scope");
608     guarantee(cvf->scope()->sender_decode_offset() == _sender_decode_offset, "wrong scope");
609     guarantee(cvf->vframe_id() == _vframe_id, "wrong vframe");
610 
611     result = cvf;
612   } else {
613     result = javaVFrame::cast(vframe::new_vframe(&_frame, &_reg_map, _thread));
614   }
615   assert(result->method() == method(), "wrong method");
616   return result;
617 }
618 
619 #ifndef PRODUCT
620 void vframe::print() {
621   if (WizardMode) _fr.print_value_on(tty,nullptr);
622 }
623 
624 void vframe::print_value() const {
625   ((vframe*)this)->print();
626 }
627 
628 
629 void entryVFrame::print_value() const {
630   ((entryVFrame*)this)->print();
631 }
632 
633 void entryVFrame::print() {
634   vframe::print();
635   tty->print_cr("C Chunk in between Java");
636   tty->print_cr("C     link " INTPTR_FORMAT, p2i(_fr.link()));
637 }
638 
639 
640 // ------------- javaVFrame --------------
641 
642 static void print_stack_values(const char* title, StackValueCollection* values) {
643   if (values->is_empty()) return;
644   tty->print_cr("\t%s:", title);
645   values->print();
646 }
647 
648 
649 void javaVFrame::print() {
650   Thread* current_thread = Thread::current();
651   ResourceMark rm(current_thread);
652   HandleMark hm(current_thread);
653 
654   vframe::print();
655   tty->print("\t");
656   method()->print_value();
657   tty->cr();
658   tty->print_cr("\tbci:    %d", bci());
659 
660   print_stack_values("locals",      locals());
661   print_stack_values("expressions", expressions());
662 
663   GrowableArray<MonitorInfo*>* list = monitors();
664   if (list->is_empty()) return;
665   tty->print_cr("\tmonitor list:");
666   for (int index = (list->length()-1); index >= 0; index--) {
667     MonitorInfo* monitor = list->at(index);
668     tty->print("\t  obj\t");
669     if (monitor->owner_is_scalar_replaced()) {
670       Klass* k = java_lang_Class::as_Klass(monitor->owner_klass());
671       tty->print("( is scalar replaced %s)", k->external_name());
672     } else if (monitor->owner() == nullptr) {
673       tty->print("( null )");
674     } else {
675       monitor->owner()->print_value();
676       tty->print("(owner=" INTPTR_FORMAT ")", p2i(monitor->owner()));
677     }
678     if (monitor->eliminated()) {
679       if(is_compiled_frame()) {
680         tty->print(" ( lock is eliminated in compiled frame )");
681       } else {
682         tty->print(" ( lock is eliminated, frame not compiled )");
683       }
684     }
685     tty->cr();
686     tty->print("\t  ");
687     monitor->lock()->print_on(tty, monitor->owner());
688     tty->cr();
689   }
690 }
691 
692 
693 void javaVFrame::print_value() const {
694   Method*    m = method();
695   InstanceKlass*     k = m->method_holder();
696   tty->print_cr("frame( sp=" INTPTR_FORMAT ", unextended_sp=" INTPTR_FORMAT ", fp=" INTPTR_FORMAT ", pc=" INTPTR_FORMAT ")",
697                 p2i(_fr.sp()),  p2i(_fr.unextended_sp()), p2i(_fr.fp()), p2i(_fr.pc()));
698   tty->print("%s.%s", k->internal_name(), m->name()->as_C_string());
699 
700   if (!m->is_native()) {
701     Symbol*  source_name = k->source_file_name();
702     int        line_number = m->line_number_from_bci(bci());
703     if (source_name != nullptr && (line_number != -1)) {
704       tty->print("(%s:%d)", source_name->as_C_string(), line_number);
705     }
706   } else {
707     tty->print("(Native Method)");
708   }
709   // Check frame size and print warning if it looks suspiciously large
710   if (fr().sp() != nullptr) {
711     RegisterMap map = *register_map();
712     uint size = fr().frame_size();
713 #ifdef _LP64
714     if (size > 8*K) warning("SUSPICIOUSLY LARGE FRAME (%d)", size);
715 #else
716     if (size > 4*K) warning("SUSPICIOUSLY LARGE FRAME (%d)", size);
717 #endif
718   }
719 }
720 
721 void javaVFrame::print_activation(int index) const {
722   // frame number and method
723   tty->print("%2d - ", index);
724   ((vframe*)this)->print_value();
725   tty->cr();
726 
727   if (WizardMode) {
728     ((vframe*)this)->print();
729     tty->cr();
730   }
731 }
732 
733 // ------------- externalVFrame --------------
734 
735 void externalVFrame::print() {
736   _fr.print_value_on(tty,nullptr);
737 }
738 
739 void externalVFrame::print_value() const {
740   ((vframe*)this)->print();
741 }
742 #endif // PRODUCT
--- EOF ---