1 /*
  2  * Copyright (c) 2001, 2021, 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 "ci/ciMetadata.hpp"
 27 #include "ci/ciMethodData.hpp"
 28 #include "ci/ciReplay.hpp"
 29 #include "ci/ciUtilities.inline.hpp"
 30 #include "compiler/compiler_globals.hpp"
 31 #include "memory/allocation.inline.hpp"
 32 #include "memory/resourceArea.hpp"
 33 #include "oops/klass.inline.hpp"
 34 #include "runtime/deoptimization.hpp"
 35 #include "utilities/copy.hpp"
 36 
 37 // ciMethodData
 38 
 39 // ------------------------------------------------------------------
 40 // ciMethodData::ciMethodData
 41 //
 42 ciMethodData::ciMethodData(MethodData* md)
 43 : ciMetadata(md),
 44   _data_size(0), _extra_data_size(0), _data(NULL),
 45   // Set an initial hint. Don't use set_hint_di() because
 46   // first_di() may be out of bounds if data_size is 0.
 47   _hint_di(first_di()),
 48   _state(empty_state),
 49   _saw_free_extra_data(false),
 50   // Initialize the escape information (to "don't know.");
 51   _eflags(0), _arg_local(0), _arg_stack(0), _arg_returned(0),
 52   _invocation_counter(0),
 53   _orig(),
 54   _parameters(NULL) {}
 55 
 56 // Check for entries that reference an unloaded method
 57 class PrepareExtraDataClosure : public CleanExtraDataClosure {
 58   MethodData*            _mdo;
 59   SafepointStateTracker  _safepoint_tracker;
 60   GrowableArray<Method*> _uncached_methods;
 61 
 62 public:
 63   PrepareExtraDataClosure(MethodData* mdo)
 64     : _mdo(mdo),
 65       _safepoint_tracker(SafepointSynchronize::safepoint_state_tracker()),
 66       _uncached_methods()
 67   { }
 68 
 69   bool is_live(Method* m) {
 70     if (!m->method_holder()->is_loader_alive()) {
 71       return false;
 72     }
 73     if (CURRENT_ENV->cached_metadata(m) == NULL) {
 74       // Uncached entries need to be pre-populated.
 75       _uncached_methods.append(m);
 76     }
 77     return true;
 78   }
 79 
 80   bool has_safepointed() {
 81     return _safepoint_tracker.safepoint_state_changed();
 82   }
 83 
 84   bool finish() {
 85     if (_uncached_methods.length() == 0) {
 86       // Preparation finished iff all Methods* were already cached.
 87       return true;
 88     }
 89     // Holding locks through safepoints is bad practice.
 90     MutexUnlocker mu(_mdo->extra_data_lock());
 91     for (int i = 0; i < _uncached_methods.length(); ++i) {
 92       if (has_safepointed()) {
 93         // The metadata in the growable array might contain stale
 94         // entries after a safepoint.
 95         return false;
 96       }
 97       Method* method = _uncached_methods.at(i);
 98       // Populating ciEnv caches may cause safepoints due
 99       // to taking the Compile_lock with safepoint checks.
100       (void)CURRENT_ENV->get_method(method);
101     }
102     return false;
103   }
104 };
105 
106 void ciMethodData::prepare_metadata() {
107   MethodData* mdo = get_MethodData();
108 
109   for (;;) {
110     ResourceMark rm;
111     PrepareExtraDataClosure cl(mdo);
112     mdo->clean_extra_data(&cl);
113     if (cl.finish()) {
114       // When encountering uncached metadata, the Compile_lock might be
115       // acquired when creating ciMetadata handles, causing safepoints
116       // which requires a new round of preparation to clean out potentially
117       // new unloading metadata.
118       return;
119     }
120   }
121 }
122 
123 void ciMethodData::load_remaining_extra_data() {
124   MethodData* mdo = get_MethodData();
125   MutexLocker ml(mdo->extra_data_lock());
126   // Deferred metadata cleaning due to concurrent class unloading.
127   prepare_metadata();
128   // After metadata preparation, there is no stale metadata,
129   // and no safepoints can introduce more stale metadata.
130   NoSafepointVerifier no_safepoint;
131 
132   assert((mdo->data_size() == _data_size) && (mdo->extra_data_size() == _extra_data_size), "sanity, unchanged");
133   assert(extra_data_base() == (DataLayout*)((address) _data + _data_size), "sanity");
134 
135   // Copy the extra data once it is prepared (i.e. cache populated, no release of extra data lock anymore)
136   Copy::disjoint_words_atomic((HeapWord*) mdo->extra_data_base(),
137                               (HeapWord*)((address) _data + _data_size),
138                               (_extra_data_size - mdo->parameters_size_in_bytes()) / HeapWordSize);
139 
140   // speculative trap entries also hold a pointer to a Method so need to be translated
141   DataLayout* dp_src  = mdo->extra_data_base();
142   DataLayout* end_src = mdo->args_data_limit();
143   DataLayout* dp_dst  = extra_data_base();
144   for (;; dp_src = MethodData::next_extra(dp_src), dp_dst = MethodData::next_extra(dp_dst)) {
145     assert(dp_src < end_src, "moved past end of extra data");
146     assert(((intptr_t)dp_dst) - ((intptr_t)extra_data_base()) == ((intptr_t)dp_src) - ((intptr_t)mdo->extra_data_base()), "source and destination don't match");
147 
148     int tag = dp_src->tag();
149     switch(tag) {
150     case DataLayout::speculative_trap_data_tag: {
151       ciSpeculativeTrapData data_dst(dp_dst);
152       SpeculativeTrapData   data_src(dp_src);
153       data_dst.translate_from(&data_src);
154       break;
155     }
156     case DataLayout::bit_data_tag:
157       break;
158     case DataLayout::no_tag:
159     case DataLayout::arg_info_data_tag:
160       // An empty slot or ArgInfoData entry marks the end of the trap data
161       {
162         return; // Need a block to avoid SS compiler bug
163       }
164     default:
165       fatal("bad tag = %d", tag);
166     }
167   }
168 }
169 
170 bool ciMethodData::load_data() {
171   MethodData* mdo = get_MethodData();
172   if (mdo == NULL) {
173     return false;
174   }
175 
176   // To do: don't copy the data if it is not "ripe" -- require a minimum #
177   // of invocations.
178 
179   // Snapshot the data and extra parameter data first without the extra trap and arg info data.
180   // Those are copied in a second step. Actually, an approximate snapshot of the data is taken.
181   // Any concurrently executing threads may be changing the data as we copy it.
182   //
183   // The first snapshot step requires two copies (data entries and parameter data entries) since
184   // the MDO is laid out as follows:
185   //
186   //  data_base:        ---------------------------
187   //                    |       data entries      |
188   //                    |           ...           |
189   //  extra_data_base:  ---------------------------
190   //                    |    trap data entries    |
191   //                    |           ...           |
192   //                    | one arg info data entry |
193   //                    |    data for each arg    |
194   //                    |           ...           |
195   //  args_data_limit:  ---------------------------
196   //                    |  parameter data entries |
197   //                    |           ...           |
198   //  extra_data_limit: ---------------------------
199   //
200   // _data_size = extra_data_base - data_base
201   // _extra_data_size = extra_data_limit - extra_data_base
202   // total_size = _data_size + _extra_data_size
203   // args_data_limit = data_base + total_size - parameter_data_size
204 
205 #ifndef ZERO
206   // Some Zero platforms do not have expected alignment, and do not use
207   // this code. static_assert would still fire and fail for them.
208   static_assert(sizeof(_orig) % HeapWordSize == 0, "align");
209 #endif
210   Copy::disjoint_words_atomic((HeapWord*) &mdo->_compiler_counters,
211                               (HeapWord*) &_orig,
212                               sizeof(_orig) / HeapWordSize);
213   Arena* arena = CURRENT_ENV->arena();
214   _data_size = mdo->data_size();
215   _extra_data_size = mdo->extra_data_size();
216   int total_size = _data_size + _extra_data_size;
217   _data = (intptr_t *) arena->Amalloc(total_size);
218   Copy::disjoint_words_atomic((HeapWord*) mdo->data_base(),
219                               (HeapWord*) _data,
220                               _data_size / HeapWordSize);
221 
222   int parameters_data_size = mdo->parameters_size_in_bytes();
223   if (parameters_data_size > 0) {
224     // Snapshot the parameter data
225     Copy::disjoint_words_atomic((HeapWord*) mdo->args_data_limit(),
226                                 (HeapWord*) ((address)_data + total_size - parameters_data_size),
227                                 parameters_data_size / HeapWordSize);
228   }
229   // Traverse the profile data, translating any oops into their
230   // ci equivalents.
231   ResourceMark rm;
232   ciProfileData* ci_data = first_data();
233   ProfileData* data = mdo->first_data();
234   while (is_valid(ci_data)) {
235     ci_data->translate_from(data);
236     ci_data = next_data(ci_data);
237     data = mdo->next_data(data);
238   }
239   if (mdo->parameters_type_data() != NULL) {
240     _parameters = data_layout_at(mdo->parameters_type_data_di());
241     ciParametersTypeData* parameters = new ciParametersTypeData(_parameters);
242     parameters->translate_from(mdo->parameters_type_data());
243   }
244 
245   assert((DataLayout*) ((address)_data + total_size - parameters_data_size) == args_data_limit(),
246       "sanity - parameter data starts after the argument data of the single ArgInfoData entry");
247   load_remaining_extra_data();
248 
249   // Note:  Extra data are all BitData, and do not need translation.
250   _invocation_counter = mdo->invocation_count();
251   _state = mdo->is_mature()? mature_state: immature_state;
252 
253   _eflags = mdo->eflags();
254   _arg_local = mdo->arg_local();
255   _arg_stack = mdo->arg_stack();
256   _arg_returned  = mdo->arg_returned();
257 #ifndef PRODUCT
258   if (ReplayCompiles) {
259     ciReplay::initialize(this);
260     if (is_empty()) {
261       return false;
262     }
263   }
264 #endif
265   return true;
266 }
267 
268 void ciReceiverTypeData::translate_receiver_data_from(const ProfileData* data) {
269   for (uint row = 0; row < row_limit(); row++) {
270     Klass* k = data->as_ReceiverTypeData()->receiver(row);
271     if (k != NULL) {
272       if (k->is_loader_alive()) {
273         ciKlass* klass = CURRENT_ENV->get_klass(k);
274         set_receiver(row, klass);
275       } else {
276         // With concurrent class unloading, the MDO could have stale metadata; override it
277         clear_row(row);
278       }
279     } else {
280       set_receiver(row, NULL);
281     }
282   }
283 }
284 
285 void ciTypeStackSlotEntries::translate_type_data_from(const TypeStackSlotEntries* entries) {
286   for (int i = 0; i < number_of_entries(); i++) {
287     intptr_t k = entries->type(i);
288     Klass* klass = (Klass*)klass_part(k);
289     if (klass != NULL && !klass->is_loader_alive()) {
290       // With concurrent class unloading, the MDO could have stale metadata; override it
291       TypeStackSlotEntries::set_type(i, TypeStackSlotEntries::with_status((Klass*)NULL, k));
292     } else {
293       TypeStackSlotEntries::set_type(i, translate_klass(k));
294     }
295   }
296 }
297 
298 void ciReturnTypeEntry::translate_type_data_from(const ReturnTypeEntry* ret) {
299   intptr_t k = ret->type();
300   Klass* klass = (Klass*)klass_part(k);
301   if (klass != NULL && !klass->is_loader_alive()) {
302     // With concurrent class unloading, the MDO could have stale metadata; override it
303     set_type(ReturnTypeEntry::with_status((Klass*)NULL, k));
304   } else {
305     set_type(translate_klass(k));
306   }
307 }
308 
309 void ciSpeculativeTrapData::translate_from(const ProfileData* data) {
310   Method* m = data->as_SpeculativeTrapData()->method();
311   ciMethod* ci_m = CURRENT_ENV->get_method(m);
312   set_method(ci_m);
313 }
314 
315 // Get the data at an arbitrary (sort of) data index.
316 ciProfileData* ciMethodData::data_at(int data_index) {
317   if (out_of_bounds(data_index)) {
318     return NULL;
319   }
320   DataLayout* data_layout = data_layout_at(data_index);
321   return data_from(data_layout);
322 }
323 
324 ciProfileData* ciMethodData::data_from(DataLayout* data_layout) {
325   switch (data_layout->tag()) {
326   case DataLayout::no_tag:
327   default:
328     ShouldNotReachHere();
329     return NULL;
330   case DataLayout::bit_data_tag:
331     return new ciBitData(data_layout);
332   case DataLayout::counter_data_tag:
333     return new ciCounterData(data_layout);
334   case DataLayout::jump_data_tag:
335     return new ciJumpData(data_layout);
336   case DataLayout::receiver_type_data_tag:
337     return new ciReceiverTypeData(data_layout);
338   case DataLayout::virtual_call_data_tag:
339     return new ciVirtualCallData(data_layout);
340   case DataLayout::ret_data_tag:
341     return new ciRetData(data_layout);
342   case DataLayout::branch_data_tag:
343     return new ciBranchData(data_layout);
344   case DataLayout::multi_branch_data_tag:
345     return new ciMultiBranchData(data_layout);
346   case DataLayout::arg_info_data_tag:
347     return new ciArgInfoData(data_layout);
348   case DataLayout::call_type_data_tag:
349     return new ciCallTypeData(data_layout);
350   case DataLayout::virtual_call_type_data_tag:
351     return new ciVirtualCallTypeData(data_layout);
352   case DataLayout::parameters_type_data_tag:
353     return new ciParametersTypeData(data_layout);
354   };
355 }
356 
357 // Iteration over data.
358 ciProfileData* ciMethodData::next_data(ciProfileData* current) {
359   int current_index = dp_to_di(current->dp());
360   int next_index = current_index + current->size_in_bytes();
361   ciProfileData* next = data_at(next_index);
362   return next;
363 }
364 
365 DataLayout* ciMethodData::next_data_layout(DataLayout* current) {
366   int current_index = dp_to_di((address)current);
367   int next_index = current_index + current->size_in_bytes();
368   if (out_of_bounds(next_index)) {
369     return NULL;
370   }
371   DataLayout* next = data_layout_at(next_index);
372   return next;
373 }
374 
375 ciProfileData* ciMethodData::bci_to_extra_data(int bci, ciMethod* m, bool& two_free_slots) {
376   DataLayout* dp  = extra_data_base();
377   DataLayout* end = args_data_limit();
378   two_free_slots = false;
379   for (;dp < end; dp = MethodData::next_extra(dp)) {
380     switch(dp->tag()) {
381     case DataLayout::no_tag:
382       _saw_free_extra_data = true;  // observed an empty slot (common case)
383       two_free_slots = (MethodData::next_extra(dp)->tag() == DataLayout::no_tag);
384       return NULL;
385     case DataLayout::arg_info_data_tag:
386       return NULL; // ArgInfoData is after the trap data right before the parameter data.
387     case DataLayout::bit_data_tag:
388       if (m == NULL && dp->bci() == bci) {
389         return new ciBitData(dp);
390       }
391       break;
392     case DataLayout::speculative_trap_data_tag: {
393       ciSpeculativeTrapData* data = new ciSpeculativeTrapData(dp);
394       // data->method() might be null if the MDO is snapshotted
395       // concurrently with a trap
396       if (m != NULL && data->method() == m && dp->bci() == bci) {
397         return data;
398       }
399       break;
400     }
401     default:
402       fatal("bad tag = %d", dp->tag());
403     }
404   }
405   return NULL;
406 }
407 
408 // Translate a bci to its corresponding data, or NULL.
409 ciProfileData* ciMethodData::bci_to_data(int bci, ciMethod* m) {
410   // If m is not NULL we look for a SpeculativeTrapData entry
411   if (m == NULL) {
412     DataLayout* data_layout = data_layout_before(bci);
413     for ( ; is_valid(data_layout); data_layout = next_data_layout(data_layout)) {
414       if (data_layout->bci() == bci) {
415         set_hint_di(dp_to_di((address)data_layout));
416         return data_from(data_layout);
417       } else if (data_layout->bci() > bci) {
418         break;
419       }
420     }
421   }
422   bool two_free_slots = false;
423   ciProfileData* result = bci_to_extra_data(bci, m, two_free_slots);
424   if (result != NULL) {
425     return result;
426   }
427   if (m != NULL && !two_free_slots) {
428     // We were looking for a SpeculativeTrapData entry we didn't
429     // find. Room is not available for more SpeculativeTrapData
430     // entries, look in the non SpeculativeTrapData entries.
431     return bci_to_data(bci, NULL);
432   }
433   return NULL;
434 }
435 
436 // Conservatively decode the trap_state of a ciProfileData.
437 int ciMethodData::has_trap_at(ciProfileData* data, int reason) {
438   typedef Deoptimization::DeoptReason DR_t;
439   int per_bc_reason
440     = Deoptimization::reason_recorded_per_bytecode_if_any((DR_t) reason);
441   if (trap_count(reason) == 0) {
442     // Impossible for this trap to have occurred, regardless of trap_state.
443     // Note:  This happens if the MDO is empty.
444     return 0;
445   } else if (per_bc_reason == Deoptimization::Reason_none) {
446     // We cannot conclude anything; a trap happened somewhere, maybe here.
447     return -1;
448   } else if (data == NULL) {
449     // No profile here, not even an extra_data record allocated on the fly.
450     // If there are empty extra_data records, and there had been a trap,
451     // there would have been a non-null data pointer.  If there are no
452     // free extra_data records, we must return a conservative -1.
453     if (_saw_free_extra_data)
454       return 0;                 // Q.E.D.
455     else
456       return -1;                // bail with a conservative answer
457   } else {
458     return Deoptimization::trap_state_has_reason(data->trap_state(), per_bc_reason);
459   }
460 }
461 
462 int ciMethodData::trap_recompiled_at(ciProfileData* data) {
463   if (data == NULL) {
464     return (_saw_free_extra_data? 0: -1);  // (see previous method)
465   } else {
466     return Deoptimization::trap_state_is_recompiled(data->trap_state())? 1: 0;
467   }
468 }
469 
470 void ciMethodData::clear_escape_info() {
471   VM_ENTRY_MARK;
472   MethodData* mdo = get_MethodData();
473   if (mdo != NULL) {
474     mdo->clear_escape_info();
475     ArgInfoData *aid = arg_info();
476     int arg_count = (aid == NULL) ? 0 : aid->number_of_args();
477     for (int i = 0; i < arg_count; i++) {
478       set_arg_modified(i, 0);
479     }
480   }
481   _eflags = _arg_local = _arg_stack = _arg_returned = 0;
482 }
483 
484 // copy our escape info to the MethodData* if it exists
485 void ciMethodData::update_escape_info() {
486   VM_ENTRY_MARK;
487   MethodData* mdo = get_MethodData();
488   if ( mdo != NULL) {
489     mdo->set_eflags(_eflags);
490     mdo->set_arg_local(_arg_local);
491     mdo->set_arg_stack(_arg_stack);
492     mdo->set_arg_returned(_arg_returned);
493     int arg_count = mdo->method()->size_of_parameters();
494     for (int i = 0; i < arg_count; i++) {
495       mdo->set_arg_modified(i, arg_modified(i));
496     }
497   }
498 }
499 
500 void ciMethodData::set_compilation_stats(short loops, short blocks) {
501   VM_ENTRY_MARK;
502   MethodData* mdo = get_MethodData();
503   if (mdo != NULL) {
504     mdo->set_num_loops(loops);
505     mdo->set_num_blocks(blocks);
506   }
507 }
508 
509 void ciMethodData::set_would_profile(bool p) {
510   VM_ENTRY_MARK;
511   MethodData* mdo = get_MethodData();
512   if (mdo != NULL) {
513     mdo->set_would_profile(p);
514   }
515 }
516 
517 void ciMethodData::set_argument_type(int bci, int i, ciKlass* k) {
518   VM_ENTRY_MARK;
519   MethodData* mdo = get_MethodData();
520   if (mdo != NULL) {
521     ProfileData* data = mdo->bci_to_data(bci);
522     if (data != NULL) {
523       if (data->is_CallTypeData()) {
524         data->as_CallTypeData()->set_argument_type(i, k->get_Klass());
525       } else {
526         assert(data->is_VirtualCallTypeData(), "no arguments!");
527         data->as_VirtualCallTypeData()->set_argument_type(i, k->get_Klass());
528       }
529     }
530   }
531 }
532 
533 void ciMethodData::set_parameter_type(int i, ciKlass* k) {
534   VM_ENTRY_MARK;
535   MethodData* mdo = get_MethodData();
536   if (mdo != NULL) {
537     mdo->parameters_type_data()->set_type(i, k->get_Klass());
538   }
539 }
540 
541 void ciMethodData::set_return_type(int bci, ciKlass* k) {
542   VM_ENTRY_MARK;
543   MethodData* mdo = get_MethodData();
544   if (mdo != NULL) {
545     ProfileData* data = mdo->bci_to_data(bci);
546     if (data != NULL) {
547       if (data->is_CallTypeData()) {
548         data->as_CallTypeData()->set_return_type(k->get_Klass());
549       } else {
550         assert(data->is_VirtualCallTypeData(), "no arguments!");
551         data->as_VirtualCallTypeData()->set_return_type(k->get_Klass());
552       }
553     }
554   }
555 }
556 
557 bool ciMethodData::has_escape_info() {
558   return eflag_set(MethodData::estimated);
559 }
560 
561 void ciMethodData::set_eflag(MethodData::EscapeFlag f) {
562   set_bits(_eflags, f);
563 }
564 
565 bool ciMethodData::eflag_set(MethodData::EscapeFlag f) const {
566   return mask_bits(_eflags, f) != 0;
567 }
568 
569 void ciMethodData::set_arg_local(int i) {
570   set_nth_bit(_arg_local, i);
571 }
572 
573 void ciMethodData::set_arg_stack(int i) {
574   set_nth_bit(_arg_stack, i);
575 }
576 
577 void ciMethodData::set_arg_returned(int i) {
578   set_nth_bit(_arg_returned, i);
579 }
580 
581 void ciMethodData::set_arg_modified(int arg, uint val) {
582   ArgInfoData *aid = arg_info();
583   if (aid == NULL)
584     return;
585   assert(arg >= 0 && arg < aid->number_of_args(), "valid argument number");
586   aid->set_arg_modified(arg, val);
587 }
588 
589 bool ciMethodData::is_arg_local(int i) const {
590   return is_set_nth_bit(_arg_local, i);
591 }
592 
593 bool ciMethodData::is_arg_stack(int i) const {
594   return is_set_nth_bit(_arg_stack, i);
595 }
596 
597 bool ciMethodData::is_arg_returned(int i) const {
598   return is_set_nth_bit(_arg_returned, i);
599 }
600 
601 uint ciMethodData::arg_modified(int arg) const {
602   ArgInfoData *aid = arg_info();
603   if (aid == NULL)
604     return 0;
605   assert(arg >= 0 && arg < aid->number_of_args(), "valid argument number");
606   return aid->arg_modified(arg);
607 }
608 
609 ByteSize ciMethodData::offset_of_slot(ciProfileData* data, ByteSize slot_offset_in_data) {
610   // Get offset within MethodData* of the data array
611   ByteSize data_offset = MethodData::data_offset();
612 
613   // Get cell offset of the ProfileData within data array
614   int cell_offset = dp_to_di(data->dp());
615 
616   // Add in counter_offset, the # of bytes into the ProfileData of counter or flag
617   int offset = in_bytes(data_offset) + cell_offset + in_bytes(slot_offset_in_data);
618 
619   return in_ByteSize(offset);
620 }
621 
622 ciArgInfoData *ciMethodData::arg_info() const {
623   // Should be last, have to skip all traps.
624   DataLayout* dp  = extra_data_base();
625   DataLayout* end = args_data_limit();
626   for (; dp < end; dp = MethodData::next_extra(dp)) {
627     if (dp->tag() == DataLayout::arg_info_data_tag)
628       return new ciArgInfoData(dp);
629   }
630   return NULL;
631 }
632 
633 
634 // Implementation of the print method.
635 void ciMethodData::print_impl(outputStream* st) {
636   ciMetadata::print_impl(st);
637 }
638 
639 void ciMethodData::dump_replay_data_type_helper(outputStream* out, int round, int& count, ProfileData* pdata, ByteSize offset, ciKlass* k) {
640   if (k != NULL) {
641     if (round == 0) {
642       count++;
643     } else {
644       out->print(" %d %s", (int)(dp_to_di(pdata->dp() + in_bytes(offset)) / sizeof(intptr_t)),
645                            CURRENT_ENV->replay_name(k));
646     }
647   }
648 }
649 
650 template<class T> void ciMethodData::dump_replay_data_receiver_type_helper(outputStream* out, int round, int& count, T* vdata) {
651   for (uint i = 0; i < vdata->row_limit(); i++) {
652     dump_replay_data_type_helper(out, round, count, vdata, vdata->receiver_offset(i), vdata->receiver(i));
653   }
654 }
655 
656 template<class T> void ciMethodData::dump_replay_data_call_type_helper(outputStream* out, int round, int& count, T* call_type_data) {
657   if (call_type_data->has_arguments()) {
658     for (int i = 0; i < call_type_data->number_of_arguments(); i++) {
659       dump_replay_data_type_helper(out, round, count, call_type_data, call_type_data->argument_type_offset(i), call_type_data->valid_argument_type(i));
660     }
661   }
662   if (call_type_data->has_return()) {
663     dump_replay_data_type_helper(out, round, count, call_type_data, call_type_data->return_type_offset(), call_type_data->valid_return_type());
664   }
665 }
666 
667 void ciMethodData::dump_replay_data_extra_data_helper(outputStream* out, int round, int& count) {
668   DataLayout* dp  = extra_data_base();
669   DataLayout* end = args_data_limit();
670 
671   for (;dp < end; dp = MethodData::next_extra(dp)) {
672     switch(dp->tag()) {
673     case DataLayout::no_tag:
674     case DataLayout::arg_info_data_tag:
675       return;
676     case DataLayout::bit_data_tag:
677       break;
678     case DataLayout::speculative_trap_data_tag: {
679       ciSpeculativeTrapData* data = new ciSpeculativeTrapData(dp);
680       ciMethod* m = data->method();
681       if (m != NULL) {
682         if (round == 0) {
683           count++;
684         } else {
685           out->print(" %d ", (int)(dp_to_di(((address)dp) + in_bytes(ciSpeculativeTrapData::method_offset())) / sizeof(intptr_t)));
686           m->dump_name_as_ascii(out);
687         }
688       }
689       break;
690     }
691     default:
692       fatal("bad tag = %d", dp->tag());
693     }
694   }
695 }
696 
697 void ciMethodData::dump_replay_data(outputStream* out) {
698   ResourceMark rm;
699   MethodData* mdo = get_MethodData();
700   Method* method = mdo->method();
701   out->print("ciMethodData ");
702   ciMethod::dump_name_as_ascii(out, method);
703   out->print(" %d %d", _state, _invocation_counter);
704 
705   // dump the contents of the MDO header as raw data
706   unsigned char* orig = (unsigned char*)&_orig;
707   int length = sizeof(_orig);
708   out->print(" orig %d", length);
709   for (int i = 0; i < length; i++) {
710     out->print(" %d", orig[i]);
711   }
712 
713   // dump the MDO data as raw data
714   int elements = (data_size() + extra_data_size()) / sizeof(intptr_t);
715   out->print(" data %d", elements);
716   for (int i = 0; i < elements; i++) {
717     // We could use INTPTR_FORMAT here but that's zero justified
718     // which makes comparing it with the SA version of this output
719     // harder. data()'s element type is intptr_t.
720     out->print(" " INTPTRNZ_FORMAT, data()[i]);
721   }
722 
723   // The MDO contained oop references as ciObjects, so scan for those
724   // and emit pairs of offset and klass name so that they can be
725   // reconstructed at runtime.  The first round counts the number of
726   // oop references and the second actually emits them.
727   ciParametersTypeData* parameters = parameters_type_data();
728   for (int count = 0, round = 0; round < 2; round++) {
729     if (round == 1) out->print(" oops %d", count);
730     ProfileData* pdata = first_data();
731     for ( ; is_valid(pdata); pdata = next_data(pdata)) {
732       if (pdata->is_VirtualCallData()) {
733         ciVirtualCallData* vdata = (ciVirtualCallData*)pdata;
734         dump_replay_data_receiver_type_helper<ciVirtualCallData>(out, round, count, vdata);
735         if (pdata->is_VirtualCallTypeData()) {
736           ciVirtualCallTypeData* call_type_data = (ciVirtualCallTypeData*)pdata;
737           dump_replay_data_call_type_helper<ciVirtualCallTypeData>(out, round, count, call_type_data);
738         }
739       } else if (pdata->is_ReceiverTypeData()) {
740         ciReceiverTypeData* vdata = (ciReceiverTypeData*)pdata;
741         dump_replay_data_receiver_type_helper<ciReceiverTypeData>(out, round, count, vdata);
742       } else if (pdata->is_CallTypeData()) {
743           ciCallTypeData* call_type_data = (ciCallTypeData*)pdata;
744           dump_replay_data_call_type_helper<ciCallTypeData>(out, round, count, call_type_data);
745       }
746     }
747     if (parameters != NULL) {
748       for (int i = 0; i < parameters->number_of_parameters(); i++) {
749         dump_replay_data_type_helper(out, round, count, parameters, ParametersTypeData::type_offset(i), parameters->valid_parameter_type(i));
750       }
751     }
752   }
753   for (int count = 0, round = 0; round < 2; round++) {
754     if (round == 1) out->print(" methods %d", count);
755     dump_replay_data_extra_data_helper(out, round, count);
756   }
757   out->cr();
758 }
759 
760 #ifndef PRODUCT
761 void ciMethodData::print() {
762   print_data_on(tty);
763 }
764 
765 void ciMethodData::print_data_on(outputStream* st) {
766   ResourceMark rm;
767   ciParametersTypeData* parameters = parameters_type_data();
768   if (parameters != NULL) {
769     parameters->print_data_on(st);
770   }
771   ciProfileData* data;
772   for (data = first_data(); is_valid(data); data = next_data(data)) {
773     st->print("%d", dp_to_di(data->dp()));
774     st->fill_to(6);
775     data->print_data_on(st);
776   }
777   st->print_cr("--- Extra data:");
778   DataLayout* dp  = extra_data_base();
779   DataLayout* end = args_data_limit();
780   for (;; dp = MethodData::next_extra(dp)) {
781     assert(dp < end, "moved past end of extra data");
782     switch (dp->tag()) {
783     case DataLayout::no_tag:
784       continue;
785     case DataLayout::bit_data_tag:
786       data = new BitData(dp);
787       break;
788     case DataLayout::arg_info_data_tag:
789       data = new ciArgInfoData(dp);
790       dp = end; // ArgInfoData is after the trap data right before the parameter data.
791       break;
792     case DataLayout::speculative_trap_data_tag:
793       data = new ciSpeculativeTrapData(dp);
794       break;
795     default:
796       fatal("unexpected tag %d", dp->tag());
797     }
798     st->print("%d", dp_to_di(data->dp()));
799     st->fill_to(6);
800     data->print_data_on(st);
801     if (dp >= end) return;
802   }
803 }
804 
805 void ciTypeEntries::print_ciklass(outputStream* st, intptr_t k) {
806   if (TypeEntries::is_type_none(k)) {
807     st->print("none");
808   } else if (TypeEntries::is_type_unknown(k)) {
809     st->print("unknown");
810   } else {
811     valid_ciklass(k)->print_name_on(st);
812   }
813   if (TypeEntries::was_null_seen(k)) {
814     st->print(" (null seen)");
815   }
816 }
817 
818 void ciTypeStackSlotEntries::print_data_on(outputStream* st) const {
819   for (int i = 0; i < number_of_entries(); i++) {
820     _pd->tab(st);
821     st->print("%d: stack (%u) ", i, stack_slot(i));
822     print_ciklass(st, type(i));
823     st->cr();
824   }
825 }
826 
827 void ciReturnTypeEntry::print_data_on(outputStream* st) const {
828   _pd->tab(st);
829   st->print("ret ");
830   print_ciklass(st, type());
831   st->cr();
832 }
833 
834 void ciCallTypeData::print_data_on(outputStream* st, const char* extra) const {
835   print_shared(st, "ciCallTypeData", extra);
836   if (has_arguments()) {
837     tab(st, true);
838     st->print_cr("argument types");
839     args()->print_data_on(st);
840   }
841   if (has_return()) {
842     tab(st, true);
843     st->print_cr("return type");
844     ret()->print_data_on(st);
845   }
846 }
847 
848 void ciReceiverTypeData::print_receiver_data_on(outputStream* st) const {
849   uint row;
850   int entries = 0;
851   for (row = 0; row < row_limit(); row++) {
852     if (receiver(row) != NULL)  entries++;
853   }
854   st->print_cr("count(%u) entries(%u)", count(), entries);
855   for (row = 0; row < row_limit(); row++) {
856     if (receiver(row) != NULL) {
857       tab(st);
858       receiver(row)->print_name_on(st);
859       st->print_cr("(%u)", receiver_count(row));
860     }
861   }
862 }
863 
864 void ciReceiverTypeData::print_data_on(outputStream* st, const char* extra) const {
865   print_shared(st, "ciReceiverTypeData", extra);
866   print_receiver_data_on(st);
867 }
868 
869 void ciVirtualCallData::print_data_on(outputStream* st, const char* extra) const {
870   print_shared(st, "ciVirtualCallData", extra);
871   rtd_super()->print_receiver_data_on(st);
872 }
873 
874 void ciVirtualCallTypeData::print_data_on(outputStream* st, const char* extra) const {
875   print_shared(st, "ciVirtualCallTypeData", extra);
876   rtd_super()->print_receiver_data_on(st);
877   if (has_arguments()) {
878     tab(st, true);
879     st->print("argument types");
880     args()->print_data_on(st);
881   }
882   if (has_return()) {
883     tab(st, true);
884     st->print("return type");
885     ret()->print_data_on(st);
886   }
887 }
888 
889 void ciParametersTypeData::print_data_on(outputStream* st, const char* extra) const {
890   st->print_cr("ciParametersTypeData");
891   parameters()->print_data_on(st);
892 }
893 
894 void ciSpeculativeTrapData::print_data_on(outputStream* st, const char* extra) const {
895   st->print_cr("ciSpeculativeTrapData");
896   tab(st);
897   method()->print_short_name(st);
898   st->cr();
899 }
900 #endif