1 /*
   2  * Copyright (c) 2000, 2016, 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/systemDictionary.hpp"
  27 #include "compiler/compilerOracle.hpp"
  28 #include "interpreter/bytecode.hpp"
  29 #include "interpreter/bytecodeStream.hpp"
  30 #include "interpreter/linkResolver.hpp"
  31 #include "memory/heapInspection.hpp"
  32 #include "memory/resourceArea.hpp"
  33 #include "oops/methodData.hpp"
  34 #include "prims/jvmtiRedefineClasses.hpp"
  35 #include "runtime/arguments.hpp"
  36 #include "runtime/compilationPolicy.hpp"
  37 #include "runtime/deoptimization.hpp"
  38 #include "runtime/handles.inline.hpp"
  39 #include "runtime/orderAccess.inline.hpp"
  40 #include "utilities/copy.hpp"
  41 
  42 // ==================================================================
  43 // DataLayout
  44 //
  45 // Overlay for generic profiling data.
  46 
  47 // Some types of data layouts need a length field.
  48 bool DataLayout::needs_array_len(u1 tag) {
  49   return (tag == multi_branch_data_tag) || (tag == arg_info_data_tag) || (tag == parameters_type_data_tag);
  50 }
  51 
  52 // Perform generic initialization of the data.  More specific
  53 // initialization occurs in overrides of ProfileData::post_initialize.
  54 void DataLayout::initialize(u1 tag, u2 bci, int cell_count) {
  55   _header._bits = (intptr_t)0;
  56   _header._struct._tag = tag;
  57   _header._struct._bci = bci;
  58   for (int i = 0; i < cell_count; i++) {
  59     set_cell_at(i, (intptr_t)0);
  60   }
  61   if (needs_array_len(tag)) {
  62     set_cell_at(ArrayData::array_len_off_set, cell_count - 1); // -1 for header.
  63   }
  64   if (tag == call_type_data_tag) {
  65     CallTypeData::initialize(this, cell_count);
  66   } else if (tag == virtual_call_type_data_tag) {
  67     VirtualCallTypeData::initialize(this, cell_count);
  68   }
  69 }
  70 
  71 void DataLayout::clean_weak_klass_links(BoolObjectClosure* cl) {
  72   ResourceMark m;
  73   data_in()->clean_weak_klass_links(cl);
  74 }
  75 
  76 
  77 // ==================================================================
  78 // ProfileData
  79 //
  80 // A ProfileData object is created to refer to a section of profiling
  81 // data in a structured way.
  82 
  83 // Constructor for invalid ProfileData.
  84 ProfileData::ProfileData() {
  85   _data = NULL;
  86 }
  87 
  88 char* ProfileData::print_data_on_helper(const MethodData* md) const {
  89   DataLayout* dp  = md->extra_data_base();
  90   DataLayout* end = md->args_data_limit();
  91   stringStream ss;
  92   for (;; dp = MethodData::next_extra(dp)) {
  93     assert(dp < end, "moved past end of extra data");
  94     switch(dp->tag()) {
  95     case DataLayout::speculative_trap_data_tag:
  96       if (dp->bci() == bci()) {
  97         SpeculativeTrapData* data = new SpeculativeTrapData(dp);
  98         int trap = data->trap_state();
  99         char buf[100];
 100         ss.print("trap/");
 101         data->method()->print_short_name(&ss);
 102         ss.print("(%s) ", Deoptimization::format_trap_state(buf, sizeof(buf), trap));
 103       }
 104       break;
 105     case DataLayout::bit_data_tag:
 106       break;
 107     case DataLayout::no_tag:
 108     case DataLayout::arg_info_data_tag:
 109       return ss.as_string();
 110       break;
 111     default:
 112       fatal("unexpected tag %d", dp->tag());
 113     }
 114   }
 115   return NULL;
 116 }
 117 
 118 void ProfileData::print_data_on(outputStream* st, const MethodData* md) const {
 119   print_data_on(st, print_data_on_helper(md));
 120 }
 121 
 122 void ProfileData::print_shared(outputStream* st, const char* name, const char* extra) const {
 123   st->print("bci: %d", bci());
 124   st->fill_to(tab_width_one);
 125   st->print("%s", name);
 126   tab(st);
 127   int trap = trap_state();
 128   if (trap != 0) {
 129     char buf[100];
 130     st->print("trap(%s) ", Deoptimization::format_trap_state(buf, sizeof(buf), trap));
 131   }
 132   if (extra != NULL) {
 133     st->print("%s", extra);
 134   }
 135   int flags = data()->flags();
 136   if (flags != 0) {
 137     st->print("flags(%d) ", flags);
 138   }
 139 }
 140 
 141 void ProfileData::tab(outputStream* st, bool first) const {
 142   st->fill_to(first ? tab_width_one : tab_width_two);
 143 }
 144 
 145 // ==================================================================
 146 // BitData
 147 //
 148 // A BitData corresponds to a one-bit flag.  This is used to indicate
 149 // whether a checkcast bytecode has seen a null value.
 150 
 151 
 152 void BitData::print_data_on(outputStream* st, const char* extra) const {
 153   print_shared(st, "BitData", extra);
 154   st->cr();
 155 }
 156 
 157 // ==================================================================
 158 // CounterData
 159 //
 160 // A CounterData corresponds to a simple counter.
 161 
 162 void CounterData::print_data_on(outputStream* st, const char* extra) const {
 163   print_shared(st, "CounterData", extra);
 164   st->print_cr("count(%u)", count());
 165 }
 166 
 167 // ==================================================================
 168 // JumpData
 169 //
 170 // A JumpData is used to access profiling information for a direct
 171 // branch.  It is a counter, used for counting the number of branches,
 172 // plus a data displacement, used for realigning the data pointer to
 173 // the corresponding target bci.
 174 
 175 void JumpData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
 176   assert(stream->bci() == bci(), "wrong pos");
 177   int target;
 178   Bytecodes::Code c = stream->code();
 179   if (c == Bytecodes::_goto_w || c == Bytecodes::_jsr_w) {
 180     target = stream->dest_w();
 181   } else {
 182     target = stream->dest();
 183   }
 184   int my_di = mdo->dp_to_di(dp());
 185   int target_di = mdo->bci_to_di(target);
 186   int offset = target_di - my_di;
 187   set_displacement(offset);
 188 }
 189 
 190 void JumpData::print_data_on(outputStream* st, const char* extra) const {
 191   print_shared(st, "JumpData", extra);
 192   st->print_cr("taken(%u) displacement(%d)", taken(), displacement());
 193 }
 194 
 195 int TypeStackSlotEntries::compute_cell_count(Symbol* signature, bool include_receiver, int max) {
 196   // Parameter profiling include the receiver
 197   int args_count = include_receiver ? 1 : 0;
 198   ResourceMark rm;
 199   SignatureStream ss(signature);
 200   args_count += ss.reference_parameter_count();
 201   args_count = MIN2(args_count, max);
 202   return args_count * per_arg_cell_count;
 203 }
 204 
 205 int TypeEntriesAtCall::compute_cell_count(BytecodeStream* stream) {
 206   assert(Bytecodes::is_invoke(stream->code()), "should be invoke");
 207   assert(TypeStackSlotEntries::per_arg_count() > ReturnTypeEntry::static_cell_count(), "code to test for arguments/results broken");
 208   const methodHandle m = stream->method();
 209   int bci = stream->bci();
 210   Bytecode_invoke inv(m, bci);
 211   int args_cell = 0;
 212   if (MethodData::profile_arguments_for_invoke(m, bci)) {
 213     args_cell = TypeStackSlotEntries::compute_cell_count(inv.signature(), false, TypeProfileArgsLimit);
 214   }
 215   int ret_cell = 0;
 216   if (MethodData::profile_return_for_invoke(m, bci) && (inv.result_type() == T_OBJECT || inv.result_type() == T_ARRAY)) {
 217     ret_cell = ReturnTypeEntry::static_cell_count();
 218   }
 219   int header_cell = 0;
 220   if (args_cell + ret_cell > 0) {
 221     header_cell = header_cell_count();
 222   }
 223 
 224   return header_cell + args_cell + ret_cell;
 225 }
 226 
 227 class ArgumentOffsetComputer : public SignatureInfo {
 228 private:
 229   int _max;
 230   GrowableArray<int> _offsets;
 231 
 232   void set(int size, BasicType type) { _size += size; }
 233   void do_object(int begin, int end) {
 234     if (_offsets.length() < _max) {
 235       _offsets.push(_size);
 236     }
 237     SignatureInfo::do_object(begin, end);
 238   }
 239   void do_array (int begin, int end) {
 240     if (_offsets.length() < _max) {
 241       _offsets.push(_size);
 242     }
 243     SignatureInfo::do_array(begin, end);
 244   }
 245 
 246 public:
 247   ArgumentOffsetComputer(Symbol* signature, int max)
 248     : SignatureInfo(signature), _max(max), _offsets(Thread::current(), max) {
 249   }
 250 
 251   int total() { lazy_iterate_parameters(); return _size; }
 252 
 253   int off_at(int i) const { return _offsets.at(i); }
 254 };
 255 
 256 void TypeStackSlotEntries::post_initialize(Symbol* signature, bool has_receiver, bool include_receiver) {
 257   ResourceMark rm;
 258   int start = 0;
 259   // Parameter profiling include the receiver
 260   if (include_receiver && has_receiver) {
 261     set_stack_slot(0, 0);
 262     set_type(0, type_none());
 263     start += 1;
 264   }
 265   ArgumentOffsetComputer aos(signature, _number_of_entries-start);
 266   aos.total();
 267   for (int i = start; i < _number_of_entries; i++) {
 268     set_stack_slot(i, aos.off_at(i-start) + (has_receiver ? 1 : 0));
 269     set_type(i, type_none());
 270   }
 271 }
 272 
 273 void CallTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
 274   assert(Bytecodes::is_invoke(stream->code()), "should be invoke");
 275   Bytecode_invoke inv(stream->method(), stream->bci());
 276 
 277   SignatureStream ss(inv.signature());
 278   if (has_arguments()) {
 279 #ifdef ASSERT
 280     ResourceMark rm;
 281     int count = MIN2(ss.reference_parameter_count(), (int)TypeProfileArgsLimit);
 282     assert(count > 0, "room for args type but none found?");
 283     check_number_of_arguments(count);
 284 #endif
 285     _args.post_initialize(inv.signature(), inv.has_receiver(), false);
 286   }
 287 
 288   if (has_return()) {
 289     assert(inv.result_type() == T_OBJECT || inv.result_type() == T_ARRAY, "room for a ret type but doesn't return obj?");
 290     _ret.post_initialize();
 291   }
 292 }
 293 
 294 void VirtualCallTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
 295   assert(Bytecodes::is_invoke(stream->code()), "should be invoke");
 296   Bytecode_invoke inv(stream->method(), stream->bci());
 297 
 298   if (has_arguments()) {
 299 #ifdef ASSERT
 300     ResourceMark rm;
 301     SignatureStream ss(inv.signature());
 302     int count = MIN2(ss.reference_parameter_count(), (int)TypeProfileArgsLimit);
 303     assert(count > 0, "room for args type but none found?");
 304     check_number_of_arguments(count);
 305 #endif
 306     _args.post_initialize(inv.signature(), inv.has_receiver(), false);
 307   }
 308 
 309   if (has_return()) {
 310     assert(inv.result_type() == T_OBJECT || inv.result_type() == T_ARRAY, "room for a ret type but doesn't return obj?");
 311     _ret.post_initialize();
 312   }
 313 }
 314 
 315 bool TypeEntries::is_loader_alive(BoolObjectClosure* is_alive_cl, intptr_t p) {
 316   Klass* k = (Klass*)klass_part(p);
 317   return k != NULL && k->is_loader_alive(is_alive_cl);
 318 }
 319 
 320 void TypeStackSlotEntries::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {
 321   for (int i = 0; i < _number_of_entries; i++) {
 322     intptr_t p = type(i);
 323     if (!is_loader_alive(is_alive_cl, p)) {
 324       set_type(i, with_status((Klass*)NULL, p));
 325     }
 326   }
 327 }
 328 
 329 void ReturnTypeEntry::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {
 330   intptr_t p = type();
 331   if (!is_loader_alive(is_alive_cl, p)) {
 332     set_type(with_status((Klass*)NULL, p));
 333   }
 334 }
 335 
 336 bool TypeEntriesAtCall::return_profiling_enabled() {
 337   return MethodData::profile_return();
 338 }
 339 
 340 bool TypeEntriesAtCall::arguments_profiling_enabled() {
 341   return MethodData::profile_arguments();
 342 }
 343 
 344 void TypeEntries::print_klass(outputStream* st, intptr_t k) {
 345   if (is_type_none(k)) {
 346     st->print("none");
 347   } else if (is_type_unknown(k)) {
 348     st->print("unknown");
 349   } else {
 350     valid_klass(k)->print_value_on(st);
 351   }
 352   if (was_null_seen(k)) {
 353     st->print(" (null seen)");
 354   }
 355 }
 356 
 357 void TypeStackSlotEntries::print_data_on(outputStream* st) const {
 358   for (int i = 0; i < _number_of_entries; i++) {
 359     _pd->tab(st);
 360     st->print("%d: stack(%u) ", i, stack_slot(i));
 361     print_klass(st, type(i));
 362     st->cr();
 363   }
 364 }
 365 
 366 void ReturnTypeEntry::print_data_on(outputStream* st) const {
 367   _pd->tab(st);
 368   print_klass(st, type());
 369   st->cr();
 370 }
 371 
 372 void CallTypeData::print_data_on(outputStream* st, const char* extra) const {
 373   CounterData::print_data_on(st, extra);
 374   if (has_arguments()) {
 375     tab(st, true);
 376     st->print("argument types");
 377     _args.print_data_on(st);
 378   }
 379   if (has_return()) {
 380     tab(st, true);
 381     st->print("return type");
 382     _ret.print_data_on(st);
 383   }
 384 }
 385 
 386 void VirtualCallTypeData::print_data_on(outputStream* st, const char* extra) const {
 387   VirtualCallData::print_data_on(st, extra);
 388   if (has_arguments()) {
 389     tab(st, true);
 390     st->print("argument types");
 391     _args.print_data_on(st);
 392   }
 393   if (has_return()) {
 394     tab(st, true);
 395     st->print("return type");
 396     _ret.print_data_on(st);
 397   }
 398 }
 399 
 400 // ==================================================================
 401 // ReceiverTypeData
 402 //
 403 // A ReceiverTypeData is used to access profiling information about a
 404 // dynamic type check.  It consists of a counter which counts the total times
 405 // that the check is reached, and a series of (Klass*, count) pairs
 406 // which are used to store a type profile for the receiver of the check.
 407 
 408 void ReceiverTypeData::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {
 409     for (uint row = 0; row < row_limit(); row++) {
 410     Klass* p = receiver(row);
 411     if (p != NULL && !p->is_loader_alive(is_alive_cl)) {
 412       clear_row(row);
 413     }
 414   }
 415 }
 416 
 417 #if INCLUDE_JVMCI
 418 void VirtualCallData::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {
 419   ReceiverTypeData::clean_weak_klass_links(is_alive_cl);
 420   for (uint row = 0; row < method_row_limit(); row++) {
 421     Method* p = method(row);
 422     if (p != NULL && !p->method_holder()->is_loader_alive(is_alive_cl)) {
 423       clear_method_row(row);
 424     }
 425   }
 426 }
 427 
 428 void VirtualCallData::clean_weak_method_links() {
 429   ReceiverTypeData::clean_weak_method_links();
 430   for (uint row = 0; row < method_row_limit(); row++) {
 431     Method* p = method(row);
 432     if (p != NULL && !p->on_stack()) {
 433       clear_method_row(row);
 434     }
 435   }
 436 }
 437 #endif // INCLUDE_JVMCI
 438 
 439 void ReceiverTypeData::print_receiver_data_on(outputStream* st) const {
 440   uint row;
 441   int entries = 0;
 442   for (row = 0; row < row_limit(); row++) {
 443     if (receiver(row) != NULL)  entries++;
 444   }
 445 #if INCLUDE_JVMCI
 446   st->print_cr("count(%u) nonprofiled_count(%u) entries(%u)", count(), nonprofiled_count(), entries);
 447 #else
 448   st->print_cr("count(%u) entries(%u)", count(), entries);
 449 #endif
 450   int total = count();
 451   for (row = 0; row < row_limit(); row++) {
 452     if (receiver(row) != NULL) {
 453       total += receiver_count(row);
 454     }
 455   }
 456   for (row = 0; row < row_limit(); row++) {
 457     if (receiver(row) != NULL) {
 458       tab(st);
 459       receiver(row)->print_value_on(st);
 460       st->print_cr("(%u %4.2f)", receiver_count(row), (float) receiver_count(row) / (float) total);
 461     }
 462   }
 463 }
 464 void ReceiverTypeData::print_data_on(outputStream* st, const char* extra) const {
 465   print_shared(st, "ReceiverTypeData", extra);
 466   print_receiver_data_on(st);
 467 }
 468 
 469 #if INCLUDE_JVMCI
 470 void VirtualCallData::print_method_data_on(outputStream* st) const {
 471   uint row;
 472   int entries = 0;
 473   for (row = 0; row < method_row_limit(); row++) {
 474     if (method(row) != NULL) entries++;
 475   }
 476   tab(st);
 477   st->print_cr("method_entries(%u)", entries);
 478   int total = count();
 479   for (row = 0; row < method_row_limit(); row++) {
 480     if (method(row) != NULL) {
 481       total += method_count(row);
 482     }
 483   }
 484   for (row = 0; row < method_row_limit(); row++) {
 485     if (method(row) != NULL) {
 486       tab(st);
 487       method(row)->print_value_on(st);
 488       st->print_cr("(%u %4.2f)", method_count(row), (float) method_count(row) / (float) total);
 489     }
 490   }
 491 }
 492 #endif // INCLUDE_JVMCI
 493 
 494 void VirtualCallData::print_data_on(outputStream* st, const char* extra) const {
 495   print_shared(st, "VirtualCallData", extra);
 496   print_receiver_data_on(st);
 497   print_method_data_on(st);
 498 }
 499 
 500 // ==================================================================
 501 // RetData
 502 //
 503 // A RetData is used to access profiling information for a ret bytecode.
 504 // It is composed of a count of the number of times that the ret has
 505 // been executed, followed by a series of triples of the form
 506 // (bci, count, di) which count the number of times that some bci was the
 507 // target of the ret and cache a corresponding displacement.
 508 
 509 void RetData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
 510   for (uint row = 0; row < row_limit(); row++) {
 511     set_bci_displacement(row, -1);
 512     set_bci(row, no_bci);
 513   }
 514   // release so other threads see a consistent state.  bci is used as
 515   // a valid flag for bci_displacement.
 516   OrderAccess::release();
 517 }
 518 
 519 // This routine needs to atomically update the RetData structure, so the
 520 // caller needs to hold the RetData_lock before it gets here.  Since taking
 521 // the lock can block (and allow GC) and since RetData is a ProfileData is a
 522 // wrapper around a derived oop, taking the lock in _this_ method will
 523 // basically cause the 'this' pointer's _data field to contain junk after the
 524 // lock.  We require the caller to take the lock before making the ProfileData
 525 // structure.  Currently the only caller is InterpreterRuntime::update_mdp_for_ret
 526 address RetData::fixup_ret(int return_bci, MethodData* h_mdo) {
 527   // First find the mdp which corresponds to the return bci.
 528   address mdp = h_mdo->bci_to_dp(return_bci);
 529 
 530   // Now check to see if any of the cache slots are open.
 531   for (uint row = 0; row < row_limit(); row++) {
 532     if (bci(row) == no_bci) {
 533       set_bci_displacement(row, mdp - dp());
 534       set_bci_count(row, DataLayout::counter_increment);
 535       // Barrier to ensure displacement is written before the bci; allows
 536       // the interpreter to read displacement without fear of race condition.
 537       release_set_bci(row, return_bci);
 538       break;
 539     }
 540   }
 541   return mdp;
 542 }
 543 
 544 #ifdef CC_INTERP
 545 DataLayout* RetData::advance(MethodData *md, int bci) {
 546   return (DataLayout*) md->bci_to_dp(bci);
 547 }
 548 #endif // CC_INTERP
 549 
 550 void RetData::print_data_on(outputStream* st, const char* extra) const {
 551   print_shared(st, "RetData", extra);
 552   uint row;
 553   int entries = 0;
 554   for (row = 0; row < row_limit(); row++) {
 555     if (bci(row) != no_bci)  entries++;
 556   }
 557   st->print_cr("count(%u) entries(%u)", count(), entries);
 558   for (row = 0; row < row_limit(); row++) {
 559     if (bci(row) != no_bci) {
 560       tab(st);
 561       st->print_cr("bci(%d: count(%u) displacement(%d))",
 562                    bci(row), bci_count(row), bci_displacement(row));
 563     }
 564   }
 565 }
 566 
 567 // ==================================================================
 568 // BranchData
 569 //
 570 // A BranchData is used to access profiling data for a two-way branch.
 571 // It consists of taken and not_taken counts as well as a data displacement
 572 // for the taken case.
 573 
 574 void BranchData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
 575   assert(stream->bci() == bci(), "wrong pos");
 576   int target = stream->dest();
 577   int my_di = mdo->dp_to_di(dp());
 578   int target_di = mdo->bci_to_di(target);
 579   int offset = target_di - my_di;
 580   set_displacement(offset);
 581 }
 582 
 583 void BranchData::print_data_on(outputStream* st, const char* extra) const {
 584   print_shared(st, "BranchData", extra);
 585   st->print_cr("taken(%u) displacement(%d)",
 586                taken(), displacement());
 587   tab(st);
 588   st->print_cr("not taken(%u)", not_taken());
 589 }
 590 
 591 // ==================================================================
 592 // MultiBranchData
 593 //
 594 // A MultiBranchData is used to access profiling information for
 595 // a multi-way branch (*switch bytecodes).  It consists of a series
 596 // of (count, displacement) pairs, which count the number of times each
 597 // case was taken and specify the data displacment for each branch target.
 598 
 599 int MultiBranchData::compute_cell_count(BytecodeStream* stream) {
 600   int cell_count = 0;
 601   if (stream->code() == Bytecodes::_tableswitch) {
 602     Bytecode_tableswitch sw(stream->method()(), stream->bcp());
 603     cell_count = 1 + per_case_cell_count * (1 + sw.length()); // 1 for default
 604   } else {
 605     Bytecode_lookupswitch sw(stream->method()(), stream->bcp());
 606     cell_count = 1 + per_case_cell_count * (sw.number_of_pairs() + 1); // 1 for default
 607   }
 608   return cell_count;
 609 }
 610 
 611 void MultiBranchData::post_initialize(BytecodeStream* stream,
 612                                       MethodData* mdo) {
 613   assert(stream->bci() == bci(), "wrong pos");
 614   int target;
 615   int my_di;
 616   int target_di;
 617   int offset;
 618   if (stream->code() == Bytecodes::_tableswitch) {
 619     Bytecode_tableswitch sw(stream->method()(), stream->bcp());
 620     int len = sw.length();
 621     assert(array_len() == per_case_cell_count * (len + 1), "wrong len");
 622     for (int count = 0; count < len; count++) {
 623       target = sw.dest_offset_at(count) + bci();
 624       my_di = mdo->dp_to_di(dp());
 625       target_di = mdo->bci_to_di(target);
 626       offset = target_di - my_di;
 627       set_displacement_at(count, offset);
 628     }
 629     target = sw.default_offset() + bci();
 630     my_di = mdo->dp_to_di(dp());
 631     target_di = mdo->bci_to_di(target);
 632     offset = target_di - my_di;
 633     set_default_displacement(offset);
 634 
 635   } else {
 636     Bytecode_lookupswitch sw(stream->method()(), stream->bcp());
 637     int npairs = sw.number_of_pairs();
 638     assert(array_len() == per_case_cell_count * (npairs + 1), "wrong len");
 639     for (int count = 0; count < npairs; count++) {
 640       LookupswitchPair pair = sw.pair_at(count);
 641       target = pair.offset() + bci();
 642       my_di = mdo->dp_to_di(dp());
 643       target_di = mdo->bci_to_di(target);
 644       offset = target_di - my_di;
 645       set_displacement_at(count, offset);
 646     }
 647     target = sw.default_offset() + bci();
 648     my_di = mdo->dp_to_di(dp());
 649     target_di = mdo->bci_to_di(target);
 650     offset = target_di - my_di;
 651     set_default_displacement(offset);
 652   }
 653 }
 654 
 655 void MultiBranchData::print_data_on(outputStream* st, const char* extra) const {
 656   print_shared(st, "MultiBranchData", extra);
 657   st->print_cr("default_count(%u) displacement(%d)",
 658                default_count(), default_displacement());
 659   int cases = number_of_cases();
 660   for (int i = 0; i < cases; i++) {
 661     tab(st);
 662     st->print_cr("count(%u) displacement(%d)",
 663                  count_at(i), displacement_at(i));
 664   }
 665 }
 666 
 667 void ArgInfoData::print_data_on(outputStream* st, const char* extra) const {
 668   print_shared(st, "ArgInfoData", extra);
 669   int nargs = number_of_args();
 670   for (int i = 0; i < nargs; i++) {
 671     st->print("  0x%x", arg_modified(i));
 672   }
 673   st->cr();
 674 }
 675 
 676 int ParametersTypeData::compute_cell_count(Method* m) {
 677   if (!MethodData::profile_parameters_for_method(m)) {
 678     return 0;
 679   }
 680   int max = TypeProfileParmsLimit == -1 ? INT_MAX : TypeProfileParmsLimit;
 681   int obj_args = TypeStackSlotEntries::compute_cell_count(m->signature(), !m->is_static(), max);
 682   if (obj_args > 0) {
 683     return obj_args + 1; // 1 cell for array len
 684   }
 685   return 0;
 686 }
 687 
 688 void ParametersTypeData::post_initialize(BytecodeStream* stream, MethodData* mdo) {
 689   _parameters.post_initialize(mdo->method()->signature(), !mdo->method()->is_static(), true);
 690 }
 691 
 692 bool ParametersTypeData::profiling_enabled() {
 693   return MethodData::profile_parameters();
 694 }
 695 
 696 void ParametersTypeData::print_data_on(outputStream* st, const char* extra) const {
 697   st->print("parameter types"); // FIXME extra ignored?
 698   _parameters.print_data_on(st);
 699 }
 700 
 701 void SpeculativeTrapData::print_data_on(outputStream* st, const char* extra) const {
 702   print_shared(st, "SpeculativeTrapData", extra);
 703   tab(st);
 704   method()->print_short_name(st);
 705   st->cr();
 706 }
 707 
 708 // ==================================================================
 709 // MethodData*
 710 //
 711 // A MethodData* holds information which has been collected about
 712 // a method.
 713 
 714 MethodData* MethodData::allocate(ClassLoaderData* loader_data, const methodHandle& method, TRAPS) {
 715   int size = MethodData::compute_allocation_size_in_words(method);
 716 
 717   return new (loader_data, size, false, MetaspaceObj::MethodDataType, THREAD)
 718     MethodData(method(), size, THREAD);
 719 }
 720 
 721 int MethodData::bytecode_cell_count(Bytecodes::Code code) {
 722   if (is_client_compilation_mode_vm()) {
 723     return no_profile_data;
 724   }
 725   switch (code) {
 726   case Bytecodes::_checkcast:
 727   case Bytecodes::_instanceof:
 728   case Bytecodes::_aastore:
 729     if (TypeProfileCasts) {
 730       return ReceiverTypeData::static_cell_count();
 731     } else {
 732       return BitData::static_cell_count();
 733     }
 734   case Bytecodes::_invokespecial:
 735   case Bytecodes::_invokestatic:
 736     if (MethodData::profile_arguments() || MethodData::profile_return()) {
 737       return variable_cell_count;
 738     } else {
 739       return CounterData::static_cell_count();
 740     }
 741   case Bytecodes::_goto:
 742   case Bytecodes::_goto_w:
 743   case Bytecodes::_jsr:
 744   case Bytecodes::_jsr_w:
 745     return JumpData::static_cell_count();
 746   case Bytecodes::_invokevirtual:
 747   case Bytecodes::_invokeinterface:
 748     if (MethodData::profile_arguments() || MethodData::profile_return()) {
 749       return variable_cell_count;
 750     } else {
 751       return VirtualCallData::static_cell_count();
 752     }
 753   case Bytecodes::_invokedynamic:
 754     if (MethodData::profile_arguments() || MethodData::profile_return()) {
 755       return variable_cell_count;
 756     } else {
 757       return CounterData::static_cell_count();
 758     }
 759   case Bytecodes::_ret:
 760     return RetData::static_cell_count();
 761   case Bytecodes::_ifeq:
 762   case Bytecodes::_ifne:
 763   case Bytecodes::_iflt:
 764   case Bytecodes::_ifge:
 765   case Bytecodes::_ifgt:
 766   case Bytecodes::_ifle:
 767   case Bytecodes::_if_icmpeq:
 768   case Bytecodes::_if_icmpne:
 769   case Bytecodes::_if_icmplt:
 770   case Bytecodes::_if_icmpge:
 771   case Bytecodes::_if_icmpgt:
 772   case Bytecodes::_if_icmple:
 773   case Bytecodes::_if_acmpeq:
 774   case Bytecodes::_if_acmpne:
 775   case Bytecodes::_ifnull:
 776   case Bytecodes::_ifnonnull:
 777     return BranchData::static_cell_count();
 778   case Bytecodes::_lookupswitch:
 779   case Bytecodes::_tableswitch:
 780     return variable_cell_count;
 781   }
 782   return no_profile_data;
 783 }
 784 
 785 // Compute the size of the profiling information corresponding to
 786 // the current bytecode.
 787 int MethodData::compute_data_size(BytecodeStream* stream) {
 788   int cell_count = bytecode_cell_count(stream->code());
 789   if (cell_count == no_profile_data) {
 790     return 0;
 791   }
 792   if (cell_count == variable_cell_count) {
 793     switch (stream->code()) {
 794     case Bytecodes::_lookupswitch:
 795     case Bytecodes::_tableswitch:
 796       cell_count = MultiBranchData::compute_cell_count(stream);
 797       break;
 798     case Bytecodes::_invokespecial:
 799     case Bytecodes::_invokestatic:
 800     case Bytecodes::_invokedynamic:
 801       assert(MethodData::profile_arguments() || MethodData::profile_return(), "should be collecting args profile");
 802       if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
 803           profile_return_for_invoke(stream->method(), stream->bci())) {
 804         cell_count = CallTypeData::compute_cell_count(stream);
 805       } else {
 806         cell_count = CounterData::static_cell_count();
 807       }
 808       break;
 809     case Bytecodes::_invokevirtual:
 810     case Bytecodes::_invokeinterface: {
 811       assert(MethodData::profile_arguments() || MethodData::profile_return(), "should be collecting args profile");
 812       if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
 813           profile_return_for_invoke(stream->method(), stream->bci())) {
 814         cell_count = VirtualCallTypeData::compute_cell_count(stream);
 815       } else {
 816         cell_count = VirtualCallData::static_cell_count();
 817       }
 818       break;
 819     }
 820     default:
 821       fatal("unexpected bytecode for var length profile data");
 822     }
 823   }
 824   // Note:  cell_count might be zero, meaning that there is just
 825   //        a DataLayout header, with no extra cells.
 826   assert(cell_count >= 0, "sanity");
 827   return DataLayout::compute_size_in_bytes(cell_count);
 828 }
 829 
 830 bool MethodData::is_speculative_trap_bytecode(Bytecodes::Code code) {
 831   // Bytecodes for which we may use speculation
 832   switch (code) {
 833   case Bytecodes::_checkcast:
 834   case Bytecodes::_instanceof:
 835   case Bytecodes::_aastore:
 836   case Bytecodes::_invokevirtual:
 837   case Bytecodes::_invokeinterface:
 838   case Bytecodes::_if_acmpeq:
 839   case Bytecodes::_if_acmpne:
 840   case Bytecodes::_ifnull:
 841   case Bytecodes::_ifnonnull:
 842   case Bytecodes::_invokestatic:
 843 #ifdef COMPILER2
 844     if (is_server_compilation_mode_vm()) {
 845       return UseTypeSpeculation;
 846     }
 847 #endif
 848   default:
 849     return false;
 850   }
 851   return false;
 852 }
 853 
 854 int MethodData::compute_extra_data_count(int data_size, int empty_bc_count, bool needs_speculative_traps) {
 855 #if INCLUDE_JVMCI
 856   if (ProfileTraps) {
 857     // Assume that up to 30% of the possibly trapping BCIs with no MDP will need to allocate one.
 858     int extra_data_count = MIN2(empty_bc_count, MAX2(4, (empty_bc_count * 30) / 100));
 859 
 860     // Make sure we have a minimum number of extra data slots to
 861     // allocate SpeculativeTrapData entries. We would want to have one
 862     // entry per compilation that inlines this method and for which
 863     // some type speculation assumption fails. So the room we need for
 864     // the SpeculativeTrapData entries doesn't directly depend on the
 865     // size of the method. Because it's hard to estimate, we reserve
 866     // space for an arbitrary number of entries.
 867     int spec_data_count = (needs_speculative_traps ? SpecTrapLimitExtraEntries : 0) *
 868       (SpeculativeTrapData::static_cell_count() + DataLayout::header_size_in_cells());
 869 
 870     return MAX2(extra_data_count, spec_data_count);
 871   } else {
 872     return 0;
 873   }
 874 #else // INCLUDE_JVMCI
 875   if (ProfileTraps) {
 876     // Assume that up to 3% of BCIs with no MDP will need to allocate one.
 877     int extra_data_count = (uint)(empty_bc_count * 3) / 128 + 1;
 878     // If the method is large, let the extra BCIs grow numerous (to ~1%).
 879     int one_percent_of_data
 880       = (uint)data_size / (DataLayout::header_size_in_bytes()*128);
 881     if (extra_data_count < one_percent_of_data)
 882       extra_data_count = one_percent_of_data;
 883     if (extra_data_count > empty_bc_count)
 884       extra_data_count = empty_bc_count;  // no need for more
 885 
 886     // Make sure we have a minimum number of extra data slots to
 887     // allocate SpeculativeTrapData entries. We would want to have one
 888     // entry per compilation that inlines this method and for which
 889     // some type speculation assumption fails. So the room we need for
 890     // the SpeculativeTrapData entries doesn't directly depend on the
 891     // size of the method. Because it's hard to estimate, we reserve
 892     // space for an arbitrary number of entries.
 893     int spec_data_count = (needs_speculative_traps ? SpecTrapLimitExtraEntries : 0) *
 894       (SpeculativeTrapData::static_cell_count() + DataLayout::header_size_in_cells());
 895 
 896     return MAX2(extra_data_count, spec_data_count);
 897   } else {
 898     return 0;
 899   }
 900 #endif // INCLUDE_JVMCI
 901 }
 902 
 903 // Compute the size of the MethodData* necessary to store
 904 // profiling information about a given method.  Size is in bytes.
 905 int MethodData::compute_allocation_size_in_bytes(const methodHandle& method) {
 906   int data_size = 0;
 907   BytecodeStream stream(method);
 908   Bytecodes::Code c;
 909   int empty_bc_count = 0;  // number of bytecodes lacking data
 910   bool needs_speculative_traps = false;
 911   while ((c = stream.next()) >= 0) {
 912     int size_in_bytes = compute_data_size(&stream);
 913     data_size += size_in_bytes;
 914     if (size_in_bytes == 0 JVMCI_ONLY(&& Bytecodes::can_trap(c)))  empty_bc_count += 1;
 915     needs_speculative_traps = needs_speculative_traps || is_speculative_trap_bytecode(c);
 916   }
 917   int object_size = in_bytes(data_offset()) + data_size;
 918 
 919   // Add some extra DataLayout cells (at least one) to track stray traps.
 920   int extra_data_count = compute_extra_data_count(data_size, empty_bc_count, needs_speculative_traps);
 921   object_size += extra_data_count * DataLayout::compute_size_in_bytes(0);
 922 
 923   // Add a cell to record information about modified arguments.
 924   int arg_size = method->size_of_parameters();
 925   object_size += DataLayout::compute_size_in_bytes(arg_size+1);
 926 
 927   // Reserve room for an area of the MDO dedicated to profiling of
 928   // parameters
 929   int args_cell = ParametersTypeData::compute_cell_count(method());
 930   if (args_cell > 0) {
 931     object_size += DataLayout::compute_size_in_bytes(args_cell);
 932   }
 933   return object_size;
 934 }
 935 
 936 // Compute the size of the MethodData* necessary to store
 937 // profiling information about a given method.  Size is in words
 938 int MethodData::compute_allocation_size_in_words(const methodHandle& method) {
 939   int byte_size = compute_allocation_size_in_bytes(method);
 940   int word_size = align_size_up(byte_size, BytesPerWord) / BytesPerWord;
 941   return align_metadata_size(word_size);
 942 }
 943 
 944 // Initialize an individual data segment.  Returns the size of
 945 // the segment in bytes.
 946 int MethodData::initialize_data(BytecodeStream* stream,
 947                                        int data_index) {
 948   if (is_client_compilation_mode_vm()) {
 949     return 0;
 950   }
 951   int cell_count = -1;
 952   int tag = DataLayout::no_tag;
 953   DataLayout* data_layout = data_layout_at(data_index);
 954   Bytecodes::Code c = stream->code();
 955   switch (c) {
 956   case Bytecodes::_checkcast:
 957   case Bytecodes::_instanceof:
 958   case Bytecodes::_aastore:
 959     if (TypeProfileCasts) {
 960       cell_count = ReceiverTypeData::static_cell_count();
 961       tag = DataLayout::receiver_type_data_tag;
 962     } else {
 963       cell_count = BitData::static_cell_count();
 964       tag = DataLayout::bit_data_tag;
 965     }
 966     break;
 967   case Bytecodes::_invokespecial:
 968   case Bytecodes::_invokestatic: {
 969     int counter_data_cell_count = CounterData::static_cell_count();
 970     if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
 971         profile_return_for_invoke(stream->method(), stream->bci())) {
 972       cell_count = CallTypeData::compute_cell_count(stream);
 973     } else {
 974       cell_count = counter_data_cell_count;
 975     }
 976     if (cell_count > counter_data_cell_count) {
 977       tag = DataLayout::call_type_data_tag;
 978     } else {
 979       tag = DataLayout::counter_data_tag;
 980     }
 981     break;
 982   }
 983   case Bytecodes::_goto:
 984   case Bytecodes::_goto_w:
 985   case Bytecodes::_jsr:
 986   case Bytecodes::_jsr_w:
 987     cell_count = JumpData::static_cell_count();
 988     tag = DataLayout::jump_data_tag;
 989     break;
 990   case Bytecodes::_invokevirtual:
 991   case Bytecodes::_invokeinterface: {
 992     int virtual_call_data_cell_count = VirtualCallData::static_cell_count();
 993     if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
 994         profile_return_for_invoke(stream->method(), stream->bci())) {
 995       cell_count = VirtualCallTypeData::compute_cell_count(stream);
 996     } else {
 997       cell_count = virtual_call_data_cell_count;
 998     }
 999     if (cell_count > virtual_call_data_cell_count) {
1000       tag = DataLayout::virtual_call_type_data_tag;
1001     } else {
1002       tag = DataLayout::virtual_call_data_tag;
1003     }
1004     break;
1005   }
1006   case Bytecodes::_invokedynamic: {
1007     // %%% should make a type profile for any invokedynamic that takes a ref argument
1008     int counter_data_cell_count = CounterData::static_cell_count();
1009     if (profile_arguments_for_invoke(stream->method(), stream->bci()) ||
1010         profile_return_for_invoke(stream->method(), stream->bci())) {
1011       cell_count = CallTypeData::compute_cell_count(stream);
1012     } else {
1013       cell_count = counter_data_cell_count;
1014     }
1015     if (cell_count > counter_data_cell_count) {
1016       tag = DataLayout::call_type_data_tag;
1017     } else {
1018       tag = DataLayout::counter_data_tag;
1019     }
1020     break;
1021   }
1022   case Bytecodes::_ret:
1023     cell_count = RetData::static_cell_count();
1024     tag = DataLayout::ret_data_tag;
1025     break;
1026   case Bytecodes::_ifeq:
1027   case Bytecodes::_ifne:
1028   case Bytecodes::_iflt:
1029   case Bytecodes::_ifge:
1030   case Bytecodes::_ifgt:
1031   case Bytecodes::_ifle:
1032   case Bytecodes::_if_icmpeq:
1033   case Bytecodes::_if_icmpne:
1034   case Bytecodes::_if_icmplt:
1035   case Bytecodes::_if_icmpge:
1036   case Bytecodes::_if_icmpgt:
1037   case Bytecodes::_if_icmple:
1038   case Bytecodes::_if_acmpeq:
1039   case Bytecodes::_if_acmpne:
1040   case Bytecodes::_ifnull:
1041   case Bytecodes::_ifnonnull:
1042     cell_count = BranchData::static_cell_count();
1043     tag = DataLayout::branch_data_tag;
1044     break;
1045   case Bytecodes::_lookupswitch:
1046   case Bytecodes::_tableswitch:
1047     cell_count = MultiBranchData::compute_cell_count(stream);
1048     tag = DataLayout::multi_branch_data_tag;
1049     break;
1050   }
1051   assert(tag == DataLayout::multi_branch_data_tag ||
1052          ((MethodData::profile_arguments() || MethodData::profile_return()) &&
1053           (tag == DataLayout::call_type_data_tag ||
1054            tag == DataLayout::counter_data_tag ||
1055            tag == DataLayout::virtual_call_type_data_tag ||
1056            tag == DataLayout::virtual_call_data_tag)) ||
1057          cell_count == bytecode_cell_count(c), "cell counts must agree");
1058   if (cell_count >= 0) {
1059     assert(tag != DataLayout::no_tag, "bad tag");
1060     assert(bytecode_has_profile(c), "agree w/ BHP");
1061     data_layout->initialize(tag, stream->bci(), cell_count);
1062     return DataLayout::compute_size_in_bytes(cell_count);
1063   } else {
1064     assert(!bytecode_has_profile(c), "agree w/ !BHP");
1065     return 0;
1066   }
1067 }
1068 
1069 // Get the data at an arbitrary (sort of) data index.
1070 ProfileData* MethodData::data_at(int data_index) const {
1071   if (out_of_bounds(data_index)) {
1072     return NULL;
1073   }
1074   DataLayout* data_layout = data_layout_at(data_index);
1075   return data_layout->data_in();
1076 }
1077 
1078 ProfileData* DataLayout::data_in() {
1079   switch (tag()) {
1080   case DataLayout::no_tag:
1081   default:
1082     ShouldNotReachHere();
1083     return NULL;
1084   case DataLayout::bit_data_tag:
1085     return new BitData(this);
1086   case DataLayout::counter_data_tag:
1087     return new CounterData(this);
1088   case DataLayout::jump_data_tag:
1089     return new JumpData(this);
1090   case DataLayout::receiver_type_data_tag:
1091     return new ReceiverTypeData(this);
1092   case DataLayout::virtual_call_data_tag:
1093     return new VirtualCallData(this);
1094   case DataLayout::ret_data_tag:
1095     return new RetData(this);
1096   case DataLayout::branch_data_tag:
1097     return new BranchData(this);
1098   case DataLayout::multi_branch_data_tag:
1099     return new MultiBranchData(this);
1100   case DataLayout::arg_info_data_tag:
1101     return new ArgInfoData(this);
1102   case DataLayout::call_type_data_tag:
1103     return new CallTypeData(this);
1104   case DataLayout::virtual_call_type_data_tag:
1105     return new VirtualCallTypeData(this);
1106   case DataLayout::parameters_type_data_tag:
1107     return new ParametersTypeData(this);
1108   case DataLayout::speculative_trap_data_tag:
1109     return new SpeculativeTrapData(this);
1110   }
1111 }
1112 
1113 // Iteration over data.
1114 ProfileData* MethodData::next_data(ProfileData* current) const {
1115   int current_index = dp_to_di(current->dp());
1116   int next_index = current_index + current->size_in_bytes();
1117   ProfileData* next = data_at(next_index);
1118   return next;
1119 }
1120 
1121 // Give each of the data entries a chance to perform specific
1122 // data initialization.
1123 void MethodData::post_initialize(BytecodeStream* stream) {
1124   ResourceMark rm;
1125   ProfileData* data;
1126   for (data = first_data(); is_valid(data); data = next_data(data)) {
1127     stream->set_start(data->bci());
1128     stream->next();
1129     data->post_initialize(stream, this);
1130   }
1131   if (_parameters_type_data_di != no_parameters) {
1132     parameters_type_data()->post_initialize(NULL, this);
1133   }
1134 }
1135 
1136 // Initialize the MethodData* corresponding to a given method.
1137 MethodData::MethodData(const methodHandle& method, int size, TRAPS)
1138   : _extra_data_lock(Monitor::leaf, "MDO extra data lock"),
1139     _parameters_type_data_di(parameters_uninitialized) {
1140   // Set the method back-pointer.
1141   _method = method();
1142   initialize();
1143 }
1144 
1145 void MethodData::initialize() {
1146   NoSafepointVerifier no_safepoint;  // init function atomic wrt GC
1147   ResourceMark rm;
1148 
1149   init();
1150   set_creation_mileage(mileage_of(method()));
1151 
1152   // Go through the bytecodes and allocate and initialize the
1153   // corresponding data cells.
1154   int data_size = 0;
1155   int empty_bc_count = 0;  // number of bytecodes lacking data
1156   _data[0] = 0;  // apparently not set below.
1157   BytecodeStream stream(method());
1158   Bytecodes::Code c;
1159   bool needs_speculative_traps = false;
1160   while ((c = stream.next()) >= 0) {
1161     int size_in_bytes = initialize_data(&stream, data_size);
1162     data_size += size_in_bytes;
1163     if (size_in_bytes == 0 JVMCI_ONLY(&& Bytecodes::can_trap(c)))  empty_bc_count += 1;
1164     needs_speculative_traps = needs_speculative_traps || is_speculative_trap_bytecode(c);
1165   }
1166   _data_size = data_size;
1167   int object_size = in_bytes(data_offset()) + data_size;
1168 
1169   // Add some extra DataLayout cells (at least one) to track stray traps.
1170   int extra_data_count = compute_extra_data_count(data_size, empty_bc_count, needs_speculative_traps);
1171   int extra_size = extra_data_count * DataLayout::compute_size_in_bytes(0);
1172 
1173   // Let's zero the space for the extra data
1174   Copy::zero_to_bytes(((address)_data) + data_size, extra_size);
1175 
1176   // Add a cell to record information about modified arguments.
1177   // Set up _args_modified array after traps cells so that
1178   // the code for traps cells works.
1179   DataLayout *dp = data_layout_at(data_size + extra_size);
1180 
1181   int arg_size = method()->size_of_parameters();
1182   dp->initialize(DataLayout::arg_info_data_tag, 0, arg_size+1);
1183 
1184   int arg_data_size = DataLayout::compute_size_in_bytes(arg_size+1);
1185   object_size += extra_size + arg_data_size;
1186 
1187   int parms_cell = ParametersTypeData::compute_cell_count(method());
1188   // If we are profiling parameters, we reserver an area near the end
1189   // of the MDO after the slots for bytecodes (because there's no bci
1190   // for method entry so they don't fit with the framework for the
1191   // profiling of bytecodes). We store the offset within the MDO of
1192   // this area (or -1 if no parameter is profiled)
1193   if (parms_cell > 0) {
1194     object_size += DataLayout::compute_size_in_bytes(parms_cell);
1195     _parameters_type_data_di = data_size + extra_size + arg_data_size;
1196     DataLayout *dp = data_layout_at(data_size + extra_size + arg_data_size);
1197     dp->initialize(DataLayout::parameters_type_data_tag, 0, parms_cell);
1198   } else {
1199     _parameters_type_data_di = no_parameters;
1200   }
1201 
1202   // Set an initial hint. Don't use set_hint_di() because
1203   // first_di() may be out of bounds if data_size is 0.
1204   // In that situation, _hint_di is never used, but at
1205   // least well-defined.
1206   _hint_di = first_di();
1207 
1208   post_initialize(&stream);
1209 
1210   assert(object_size == compute_allocation_size_in_bytes(methodHandle(_method)), "MethodData: computed size != initialized size");
1211   set_size(object_size);
1212 }
1213 
1214 void MethodData::init() {
1215   _invocation_counter.init();
1216   _backedge_counter.init();
1217   _invocation_counter_start = 0;
1218   _backedge_counter_start = 0;
1219 
1220   // Set per-method invoke- and backedge mask.
1221   double scale = 1.0;
1222   CompilerOracle::has_option_value(_method, "CompileThresholdScaling", scale);
1223   _invoke_mask = right_n_bits(Arguments::scaled_freq_log(Tier0InvokeNotifyFreqLog, scale)) << InvocationCounter::count_shift;
1224   _backedge_mask = right_n_bits(Arguments::scaled_freq_log(Tier0BackedgeNotifyFreqLog, scale)) << InvocationCounter::count_shift;
1225 
1226   _tenure_traps = 0;
1227   _num_loops = 0;
1228   _num_blocks = 0;
1229   _would_profile = unknown;
1230 
1231 #if INCLUDE_JVMCI
1232   _jvmci_ir_size = 0;
1233 #endif
1234 
1235 #if INCLUDE_RTM_OPT
1236   _rtm_state = NoRTM; // No RTM lock eliding by default
1237   if (UseRTMLocking &&
1238       !CompilerOracle::has_option_string(_method, "NoRTMLockEliding")) {
1239     if (CompilerOracle::has_option_string(_method, "UseRTMLockEliding") || !UseRTMDeopt) {
1240       // Generate RTM lock eliding code without abort ratio calculation code.
1241       _rtm_state = UseRTM;
1242     } else if (UseRTMDeopt) {
1243       // Generate RTM lock eliding code and include abort ratio calculation
1244       // code if UseRTMDeopt is on.
1245       _rtm_state = ProfileRTM;
1246     }
1247   }
1248 #endif
1249 
1250   // Initialize flags and trap history.
1251   _nof_decompiles = 0;
1252   _nof_overflow_recompiles = 0;
1253   _nof_overflow_traps = 0;
1254   clear_escape_info();
1255   assert(sizeof(_trap_hist) % sizeof(HeapWord) == 0, "align");
1256   Copy::zero_to_words((HeapWord*) &_trap_hist,
1257                       sizeof(_trap_hist) / sizeof(HeapWord));
1258 }
1259 
1260 // Get a measure of how much mileage the method has on it.
1261 int MethodData::mileage_of(Method* method) {
1262   int mileage = 0;
1263   if (TieredCompilation) {
1264     mileage = MAX2(method->invocation_count(), method->backedge_count());
1265   } else {
1266     int iic = method->interpreter_invocation_count();
1267     if (mileage < iic)  mileage = iic;
1268     MethodCounters* mcs = method->method_counters();
1269     if (mcs != NULL) {
1270       InvocationCounter* ic = mcs->invocation_counter();
1271       InvocationCounter* bc = mcs->backedge_counter();
1272       int icval = ic->count();
1273       if (ic->carry()) icval += CompileThreshold;
1274       if (mileage < icval)  mileage = icval;
1275       int bcval = bc->count();
1276       if (bc->carry()) bcval += CompileThreshold;
1277       if (mileage < bcval)  mileage = bcval;
1278     }
1279   }
1280   return mileage;
1281 }
1282 
1283 bool MethodData::is_mature() const {
1284   return CompilationPolicy::policy()->is_mature(_method);
1285 }
1286 
1287 // Translate a bci to its corresponding data index (di).
1288 address MethodData::bci_to_dp(int bci) {
1289   ResourceMark rm;
1290   ProfileData* data = data_before(bci);
1291   ProfileData* prev = NULL;
1292   for ( ; is_valid(data); data = next_data(data)) {
1293     if (data->bci() >= bci) {
1294       if (data->bci() == bci)  set_hint_di(dp_to_di(data->dp()));
1295       else if (prev != NULL)   set_hint_di(dp_to_di(prev->dp()));
1296       return data->dp();
1297     }
1298     prev = data;
1299   }
1300   return (address)limit_data_position();
1301 }
1302 
1303 // Translate a bci to its corresponding data, or NULL.
1304 ProfileData* MethodData::bci_to_data(int bci) {
1305   ProfileData* data = data_before(bci);
1306   for ( ; is_valid(data); data = next_data(data)) {
1307     if (data->bci() == bci) {
1308       set_hint_di(dp_to_di(data->dp()));
1309       return data;
1310     } else if (data->bci() > bci) {
1311       break;
1312     }
1313   }
1314   return bci_to_extra_data(bci, NULL, false);
1315 }
1316 
1317 DataLayout* MethodData::next_extra(DataLayout* dp) {
1318   int nb_cells = 0;
1319   switch(dp->tag()) {
1320   case DataLayout::bit_data_tag:
1321   case DataLayout::no_tag:
1322     nb_cells = BitData::static_cell_count();
1323     break;
1324   case DataLayout::speculative_trap_data_tag:
1325     nb_cells = SpeculativeTrapData::static_cell_count();
1326     break;
1327   default:
1328     fatal("unexpected tag %d", dp->tag());
1329   }
1330   return (DataLayout*)((address)dp + DataLayout::compute_size_in_bytes(nb_cells));
1331 }
1332 
1333 ProfileData* MethodData::bci_to_extra_data_helper(int bci, Method* m, DataLayout*& dp, bool concurrent) {
1334   DataLayout* end = args_data_limit();
1335 
1336   for (;; dp = next_extra(dp)) {
1337     assert(dp < end, "moved past end of extra data");
1338     // No need for "OrderAccess::load_acquire" ops,
1339     // since the data structure is monotonic.
1340     switch(dp->tag()) {
1341     case DataLayout::no_tag:
1342       return NULL;
1343     case DataLayout::arg_info_data_tag:
1344       dp = end;
1345       return NULL; // ArgInfoData is at the end of extra data section.
1346     case DataLayout::bit_data_tag:
1347       if (m == NULL && dp->bci() == bci) {
1348         return new BitData(dp);
1349       }
1350       break;
1351     case DataLayout::speculative_trap_data_tag:
1352       if (m != NULL) {
1353         SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1354         // data->method() may be null in case of a concurrent
1355         // allocation. Maybe it's for the same method. Try to use that
1356         // entry in that case.
1357         if (dp->bci() == bci) {
1358           if (data->method() == NULL) {
1359             assert(concurrent, "impossible because no concurrent allocation");
1360             return NULL;
1361           } else if (data->method() == m) {
1362             return data;
1363           }
1364         }
1365       }
1366       break;
1367     default:
1368       fatal("unexpected tag %d", dp->tag());
1369     }
1370   }
1371   return NULL;
1372 }
1373 
1374 
1375 // Translate a bci to its corresponding extra data, or NULL.
1376 ProfileData* MethodData::bci_to_extra_data(int bci, Method* m, bool create_if_missing) {
1377   // This code assumes an entry for a SpeculativeTrapData is 2 cells
1378   assert(2*DataLayout::compute_size_in_bytes(BitData::static_cell_count()) ==
1379          DataLayout::compute_size_in_bytes(SpeculativeTrapData::static_cell_count()),
1380          "code needs to be adjusted");
1381 
1382   // Do not create one of these if method has been redefined.
1383   if (m != NULL && m->is_old()) {
1384     return NULL;
1385   }
1386 
1387   DataLayout* dp  = extra_data_base();
1388   DataLayout* end = args_data_limit();
1389 
1390   // Allocation in the extra data space has to be atomic because not
1391   // all entries have the same size and non atomic concurrent
1392   // allocation would result in a corrupted extra data space.
1393   ProfileData* result = bci_to_extra_data_helper(bci, m, dp, true);
1394   if (result != NULL) {
1395     return result;
1396   }
1397 
1398   if (create_if_missing && dp < end) {
1399     MutexLocker ml(&_extra_data_lock);
1400     // Check again now that we have the lock. Another thread may
1401     // have added extra data entries.
1402     ProfileData* result = bci_to_extra_data_helper(bci, m, dp, false);
1403     if (result != NULL || dp >= end) {
1404       return result;
1405     }
1406 
1407     assert(dp->tag() == DataLayout::no_tag || (dp->tag() == DataLayout::speculative_trap_data_tag && m != NULL), "should be free");
1408     assert(next_extra(dp)->tag() == DataLayout::no_tag || next_extra(dp)->tag() == DataLayout::arg_info_data_tag, "should be free or arg info");
1409     u1 tag = m == NULL ? DataLayout::bit_data_tag : DataLayout::speculative_trap_data_tag;
1410     // SpeculativeTrapData is 2 slots. Make sure we have room.
1411     if (m != NULL && next_extra(dp)->tag() != DataLayout::no_tag) {
1412       return NULL;
1413     }
1414     DataLayout temp;
1415     temp.initialize(tag, bci, 0);
1416 
1417     dp->set_header(temp.header());
1418     assert(dp->tag() == tag, "sane");
1419     assert(dp->bci() == bci, "no concurrent allocation");
1420     if (tag == DataLayout::bit_data_tag) {
1421       return new BitData(dp);
1422     } else {
1423       SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1424       data->set_method(m);
1425       return data;
1426     }
1427   }
1428   return NULL;
1429 }
1430 
1431 ArgInfoData *MethodData::arg_info() {
1432   DataLayout* dp    = extra_data_base();
1433   DataLayout* end   = args_data_limit();
1434   for (; dp < end; dp = next_extra(dp)) {
1435     if (dp->tag() == DataLayout::arg_info_data_tag)
1436       return new ArgInfoData(dp);
1437   }
1438   return NULL;
1439 }
1440 
1441 // Printing
1442 
1443 void MethodData::print_on(outputStream* st) const {
1444   assert(is_methodData(), "should be method data");
1445   st->print("method data for ");
1446   method()->print_value_on(st);
1447   st->cr();
1448   print_data_on(st);
1449 }
1450 
1451 void MethodData::print_value_on(outputStream* st) const {
1452   assert(is_methodData(), "should be method data");
1453   st->print("method data for ");
1454   method()->print_value_on(st);
1455 }
1456 
1457 void MethodData::print_data_on(outputStream* st) const {
1458   ResourceMark rm;
1459   ProfileData* data = first_data();
1460   if (_parameters_type_data_di != no_parameters) {
1461     parameters_type_data()->print_data_on(st);
1462   }
1463   for ( ; is_valid(data); data = next_data(data)) {
1464     st->print("%d", dp_to_di(data->dp()));
1465     st->fill_to(6);
1466     data->print_data_on(st, this);
1467   }
1468   st->print_cr("--- Extra data:");
1469   DataLayout* dp    = extra_data_base();
1470   DataLayout* end   = args_data_limit();
1471   for (;; dp = next_extra(dp)) {
1472     assert(dp < end, "moved past end of extra data");
1473     // No need for "OrderAccess::load_acquire" ops,
1474     // since the data structure is monotonic.
1475     switch(dp->tag()) {
1476     case DataLayout::no_tag:
1477       continue;
1478     case DataLayout::bit_data_tag:
1479       data = new BitData(dp);
1480       break;
1481     case DataLayout::speculative_trap_data_tag:
1482       data = new SpeculativeTrapData(dp);
1483       break;
1484     case DataLayout::arg_info_data_tag:
1485       data = new ArgInfoData(dp);
1486       dp = end; // ArgInfoData is at the end of extra data section.
1487       break;
1488     default:
1489       fatal("unexpected tag %d", dp->tag());
1490     }
1491     st->print("%d", dp_to_di(data->dp()));
1492     st->fill_to(6);
1493     data->print_data_on(st);
1494     if (dp >= end) return;
1495   }
1496 }
1497 
1498 #if INCLUDE_SERVICES
1499 // Size Statistics
1500 void MethodData::collect_statistics(KlassSizeStats *sz) const {
1501   int n = sz->count(this);
1502   sz->_method_data_bytes += n;
1503   sz->_method_all_bytes += n;
1504   sz->_rw_bytes += n;
1505 }
1506 #endif // INCLUDE_SERVICES
1507 
1508 // Verification
1509 
1510 void MethodData::verify_on(outputStream* st) {
1511   guarantee(is_methodData(), "object must be method data");
1512   // guarantee(m->is_perm(), "should be in permspace");
1513   this->verify_data_on(st);
1514 }
1515 
1516 void MethodData::verify_data_on(outputStream* st) {
1517   NEEDS_CLEANUP;
1518   // not yet implemented.
1519 }
1520 
1521 bool MethodData::profile_jsr292(const methodHandle& m, int bci) {
1522   if (m->is_compiled_lambda_form()) {
1523     return true;
1524   }
1525 
1526   Bytecode_invoke inv(m , bci);
1527   return inv.is_invokedynamic() || inv.is_invokehandle();
1528 }
1529 
1530 bool MethodData::profile_unsafe(const methodHandle& m, int bci) {
1531   Bytecode_invoke inv(m , bci);
1532   if (inv.is_invokevirtual() && inv.klass() == vmSymbols::jdk_internal_misc_Unsafe()) {
1533     ResourceMark rm;
1534     char* name = inv.name()->as_C_string();
1535     if (!strncmp(name, "get", 3) || !strncmp(name, "put", 3)) {
1536       return true;
1537     }
1538   }
1539   return false;
1540 }
1541 
1542 int MethodData::profile_arguments_flag() {
1543   return TypeProfileLevel % 10;
1544 }
1545 
1546 bool MethodData::profile_arguments() {
1547   return profile_arguments_flag() > no_type_profile && profile_arguments_flag() <= type_profile_all;
1548 }
1549 
1550 bool MethodData::profile_arguments_jsr292_only() {
1551   return profile_arguments_flag() == type_profile_jsr292;
1552 }
1553 
1554 bool MethodData::profile_all_arguments() {
1555   return profile_arguments_flag() == type_profile_all;
1556 }
1557 
1558 bool MethodData::profile_arguments_for_invoke(const methodHandle& m, int bci) {
1559   if (!profile_arguments()) {
1560     return false;
1561   }
1562 
1563   if (profile_all_arguments()) {
1564     return true;
1565   }
1566 
1567   if (profile_unsafe(m, bci)) {
1568     return true;
1569   }
1570 
1571   assert(profile_arguments_jsr292_only(), "inconsistent");
1572   return profile_jsr292(m, bci);
1573 }
1574 
1575 int MethodData::profile_return_flag() {
1576   return (TypeProfileLevel % 100) / 10;
1577 }
1578 
1579 bool MethodData::profile_return() {
1580   return profile_return_flag() > no_type_profile && profile_return_flag() <= type_profile_all;
1581 }
1582 
1583 bool MethodData::profile_return_jsr292_only() {
1584   return profile_return_flag() == type_profile_jsr292;
1585 }
1586 
1587 bool MethodData::profile_all_return() {
1588   return profile_return_flag() == type_profile_all;
1589 }
1590 
1591 bool MethodData::profile_return_for_invoke(const methodHandle& m, int bci) {
1592   if (!profile_return()) {
1593     return false;
1594   }
1595 
1596   if (profile_all_return()) {
1597     return true;
1598   }
1599 
1600   assert(profile_return_jsr292_only(), "inconsistent");
1601   return profile_jsr292(m, bci);
1602 }
1603 
1604 int MethodData::profile_parameters_flag() {
1605   return TypeProfileLevel / 100;
1606 }
1607 
1608 bool MethodData::profile_parameters() {
1609   return profile_parameters_flag() > no_type_profile && profile_parameters_flag() <= type_profile_all;
1610 }
1611 
1612 bool MethodData::profile_parameters_jsr292_only() {
1613   return profile_parameters_flag() == type_profile_jsr292;
1614 }
1615 
1616 bool MethodData::profile_all_parameters() {
1617   return profile_parameters_flag() == type_profile_all;
1618 }
1619 
1620 bool MethodData::profile_parameters_for_method(const methodHandle& m) {
1621   if (!profile_parameters()) {
1622     return false;
1623   }
1624 
1625   if (profile_all_parameters()) {
1626     return true;
1627   }
1628 
1629   assert(profile_parameters_jsr292_only(), "inconsistent");
1630   return m->is_compiled_lambda_form();
1631 }
1632 
1633 void MethodData::clean_extra_data_helper(DataLayout* dp, int shift, bool reset) {
1634   if (shift == 0) {
1635     return;
1636   }
1637   if (!reset) {
1638     // Move all cells of trap entry at dp left by "shift" cells
1639     intptr_t* start = (intptr_t*)dp;
1640     intptr_t* end = (intptr_t*)next_extra(dp);
1641     for (intptr_t* ptr = start; ptr < end; ptr++) {
1642       *(ptr-shift) = *ptr;
1643     }
1644   } else {
1645     // Reset "shift" cells stopping at dp
1646     intptr_t* start = ((intptr_t*)dp) - shift;
1647     intptr_t* end = (intptr_t*)dp;
1648     for (intptr_t* ptr = start; ptr < end; ptr++) {
1649       *ptr = 0;
1650     }
1651   }
1652 }
1653 
1654 class CleanExtraDataClosure : public StackObj {
1655 public:
1656   virtual bool is_live(Method* m) = 0;
1657 };
1658 
1659 // Check for entries that reference an unloaded method
1660 class CleanExtraDataKlassClosure : public CleanExtraDataClosure {
1661 private:
1662   BoolObjectClosure* _is_alive;
1663 public:
1664   CleanExtraDataKlassClosure(BoolObjectClosure* is_alive) : _is_alive(is_alive) {}
1665   bool is_live(Method* m) {
1666     return m->method_holder()->is_loader_alive(_is_alive);
1667   }
1668 };
1669 
1670 // Check for entries that reference a redefined method
1671 class CleanExtraDataMethodClosure : public CleanExtraDataClosure {
1672 public:
1673   CleanExtraDataMethodClosure() {}
1674   bool is_live(Method* m) { return !m->is_old(); }
1675 };
1676 
1677 
1678 // Remove SpeculativeTrapData entries that reference an unloaded or
1679 // redefined method
1680 void MethodData::clean_extra_data(CleanExtraDataClosure* cl) {
1681   DataLayout* dp  = extra_data_base();
1682   DataLayout* end = args_data_limit();
1683 
1684   int shift = 0;
1685   for (; dp < end; dp = next_extra(dp)) {
1686     switch(dp->tag()) {
1687     case DataLayout::speculative_trap_data_tag: {
1688       SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1689       Method* m = data->method();
1690       assert(m != NULL, "should have a method");
1691       if (!cl->is_live(m)) {
1692         // "shift" accumulates the number of cells for dead
1693         // SpeculativeTrapData entries that have been seen so
1694         // far. Following entries must be shifted left by that many
1695         // cells to remove the dead SpeculativeTrapData entries.
1696         shift += (int)((intptr_t*)next_extra(dp) - (intptr_t*)dp);
1697       } else {
1698         // Shift this entry left if it follows dead
1699         // SpeculativeTrapData entries
1700         clean_extra_data_helper(dp, shift);
1701       }
1702       break;
1703     }
1704     case DataLayout::bit_data_tag:
1705       // Shift this entry left if it follows dead SpeculativeTrapData
1706       // entries
1707       clean_extra_data_helper(dp, shift);
1708       continue;
1709     case DataLayout::no_tag:
1710     case DataLayout::arg_info_data_tag:
1711       // We are at end of the live trap entries. The previous "shift"
1712       // cells contain entries that are either dead or were shifted
1713       // left. They need to be reset to no_tag
1714       clean_extra_data_helper(dp, shift, true);
1715       return;
1716     default:
1717       fatal("unexpected tag %d", dp->tag());
1718     }
1719   }
1720 }
1721 
1722 // Verify there's no unloaded or redefined method referenced by a
1723 // SpeculativeTrapData entry
1724 void MethodData::verify_extra_data_clean(CleanExtraDataClosure* cl) {
1725 #ifdef ASSERT
1726   DataLayout* dp  = extra_data_base();
1727   DataLayout* end = args_data_limit();
1728 
1729   for (; dp < end; dp = next_extra(dp)) {
1730     switch(dp->tag()) {
1731     case DataLayout::speculative_trap_data_tag: {
1732       SpeculativeTrapData* data = new SpeculativeTrapData(dp);
1733       Method* m = data->method();
1734       assert(m != NULL && cl->is_live(m), "Method should exist");
1735       break;
1736     }
1737     case DataLayout::bit_data_tag:
1738       continue;
1739     case DataLayout::no_tag:
1740     case DataLayout::arg_info_data_tag:
1741       return;
1742     default:
1743       fatal("unexpected tag %d", dp->tag());
1744     }
1745   }
1746 #endif
1747 }
1748 
1749 void MethodData::clean_method_data(BoolObjectClosure* is_alive) {
1750   ResourceMark rm;
1751   for (ProfileData* data = first_data();
1752        is_valid(data);
1753        data = next_data(data)) {
1754     data->clean_weak_klass_links(is_alive);
1755   }
1756   ParametersTypeData* parameters = parameters_type_data();
1757   if (parameters != NULL) {
1758     parameters->clean_weak_klass_links(is_alive);
1759   }
1760 
1761   CleanExtraDataKlassClosure cl(is_alive);
1762   clean_extra_data(&cl);
1763   verify_extra_data_clean(&cl);
1764 }
1765 
1766 void MethodData::clean_weak_method_links() {
1767   ResourceMark rm;
1768   for (ProfileData* data = first_data();
1769        is_valid(data);
1770        data = next_data(data)) {
1771     data->clean_weak_method_links();
1772   }
1773 
1774   CleanExtraDataMethodClosure cl;
1775   clean_extra_data(&cl);
1776   verify_extra_data_clean(&cl);
1777 }
1778 
1779 #ifdef ASSERT
1780 void MethodData::verify_clean_weak_method_links() {
1781   ResourceMark rm;
1782   for (ProfileData* data = first_data();
1783        is_valid(data);
1784        data = next_data(data)) {
1785     data->verify_clean_weak_method_links();
1786   }
1787 
1788   CleanExtraDataMethodClosure cl;
1789   verify_extra_data_clean(&cl);
1790 }
1791 #endif // ASSERT