1 /*
   2  * Copyright (c) 1999, 2017, 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/ciConstant.hpp"
  27 #include "ci/ciEnv.hpp"
  28 #include "ci/ciField.hpp"
  29 #include "ci/ciInstance.hpp"
  30 #include "ci/ciInstanceKlass.hpp"
  31 #include "ci/ciMethod.hpp"
  32 #include "ci/ciNullObject.hpp"
  33 #include "ci/ciReplay.hpp"
  34 #include "ci/ciUtilities.hpp"
  35 #include "classfile/systemDictionary.hpp"
  36 #include "classfile/vmSymbols.hpp"
  37 #include "code/codeCache.hpp"
  38 #include "code/scopeDesc.hpp"
  39 #include "compiler/compileBroker.hpp"
  40 #include "compiler/compileLog.hpp"
  41 #include "compiler/disassembler.hpp"
  42 #include "gc/shared/collectedHeap.inline.hpp"
  43 #include "interpreter/linkResolver.hpp"
  44 #include "memory/allocation.inline.hpp"
  45 #include "memory/oopFactory.hpp"
  46 #include "memory/resourceArea.hpp"
  47 #include "memory/universe.inline.hpp"
  48 #include "oops/methodData.hpp"
  49 #include "oops/objArrayKlass.hpp"
  50 #include "oops/objArrayOop.inline.hpp"
  51 #include "oops/oop.inline.hpp"
  52 #include "prims/jvm.h"
  53 #include "prims/jvmtiExport.hpp"
  54 #include "runtime/init.hpp"
  55 #include "runtime/reflection.hpp"
  56 #include "runtime/sharedRuntime.hpp"
  57 #include "runtime/thread.inline.hpp"
  58 #include "trace/tracing.hpp"
  59 #include "utilities/dtrace.hpp"
  60 #include "utilities/macros.hpp"
  61 #ifdef COMPILER1
  62 #include "c1/c1_Runtime1.hpp"
  63 #endif
  64 #ifdef COMPILER2
  65 #include "opto/runtime.hpp"
  66 #endif
  67 
  68 // ciEnv
  69 //
  70 // This class is the top level broker for requests from the compiler
  71 // to the VM.
  72 
  73 ciObject*              ciEnv::_null_object_instance;
  74 
  75 #define WK_KLASS_DEFN(name, ignore_s, ignore_o) ciInstanceKlass* ciEnv::_##name = NULL;
  76 WK_KLASSES_DO(WK_KLASS_DEFN)
  77 #undef WK_KLASS_DEFN
  78 
  79 ciSymbol*        ciEnv::_unloaded_cisymbol = NULL;
  80 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
  81 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
  82 
  83 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
  84 jobject ciEnv::_ArrayStoreException_handle = NULL;
  85 jobject ciEnv::_ClassCastException_handle = NULL;
  86 
  87 #ifndef PRODUCT
  88 static bool firstEnv = true;
  89 #endif /* PRODUCT */
  90 
  91 // ------------------------------------------------------------------
  92 // ciEnv::ciEnv
  93 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter)
  94   : _ciEnv_arena(mtCompiler) {
  95   VM_ENTRY_MARK;
  96 
  97   // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
  98   thread->set_env(this);
  99   assert(ciEnv::current() == this, "sanity");
 100 
 101   _oop_recorder = NULL;
 102   _debug_info = NULL;
 103   _dependencies = NULL;
 104   _failure_reason = NULL;
 105   _inc_decompile_count_on_failure = true;
 106   _compilable = MethodCompilable;
 107   _break_at_compile = false;
 108   _compiler_data = NULL;
 109 #ifndef PRODUCT
 110   assert(!firstEnv, "not initialized properly");
 111 #endif /* !PRODUCT */
 112 
 113   _system_dictionary_modification_counter = system_dictionary_modification_counter;
 114   _num_inlined_bytecodes = 0;
 115   assert(task == NULL || thread->task() == task, "sanity");
 116   _task = task;
 117   _log = NULL;
 118 
 119   // Temporary buffer for creating symbols and such.
 120   _name_buffer = NULL;
 121   _name_buffer_len = 0;
 122 
 123   _arena   = &_ciEnv_arena;
 124   _factory = new (_arena) ciObjectFactory(_arena, 128);
 125 
 126   // Preload commonly referenced system ciObjects.
 127 
 128   // During VM initialization, these instances have not yet been created.
 129   // Assertions ensure that these instances are not accessed before
 130   // their initialization.
 131 
 132   assert(Universe::is_fully_initialized(), "should be complete");
 133 
 134   oop o = Universe::null_ptr_exception_instance();
 135   assert(o != NULL, "should have been initialized");
 136   _NullPointerException_instance = get_object(o)->as_instance();
 137   o = Universe::arithmetic_exception_instance();
 138   assert(o != NULL, "should have been initialized");
 139   _ArithmeticException_instance = get_object(o)->as_instance();
 140 
 141   _ArrayIndexOutOfBoundsException_instance = NULL;
 142   _ArrayStoreException_instance = NULL;
 143   _ClassCastException_instance = NULL;
 144   _the_null_string = NULL;
 145   _the_min_jint_string = NULL;
 146 
 147   _jvmti_can_hotswap_or_post_breakpoint = false;
 148   _jvmti_can_access_local_variables = false;
 149   _jvmti_can_post_on_exceptions = false;
 150   _jvmti_can_pop_frame = false;
 151 }
 152 
 153 ciEnv::ciEnv(Arena* arena) : _ciEnv_arena(mtCompiler) {
 154   ASSERT_IN_VM;
 155 
 156   // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
 157   CompilerThread* current_thread = CompilerThread::current();
 158   assert(current_thread->env() == NULL, "must be");
 159   current_thread->set_env(this);
 160   assert(ciEnv::current() == this, "sanity");
 161 
 162   _oop_recorder = NULL;
 163   _debug_info = NULL;
 164   _dependencies = NULL;
 165   _failure_reason = NULL;
 166   _inc_decompile_count_on_failure = true;
 167   _compilable = MethodCompilable_never;
 168   _break_at_compile = false;
 169   _compiler_data = NULL;
 170 #ifndef PRODUCT
 171   assert(firstEnv, "must be first");
 172   firstEnv = false;
 173 #endif /* !PRODUCT */
 174 
 175   _system_dictionary_modification_counter = 0;
 176   _num_inlined_bytecodes = 0;
 177   _task = NULL;
 178   _log = NULL;
 179 
 180   // Temporary buffer for creating symbols and such.
 181   _name_buffer = NULL;
 182   _name_buffer_len = 0;
 183 
 184   _arena   = arena;
 185   _factory = new (_arena) ciObjectFactory(_arena, 128);
 186 
 187   // Preload commonly referenced system ciObjects.
 188 
 189   // During VM initialization, these instances have not yet been created.
 190   // Assertions ensure that these instances are not accessed before
 191   // their initialization.
 192 
 193   assert(Universe::is_fully_initialized(), "must be");
 194 
 195   _NullPointerException_instance = NULL;
 196   _ArithmeticException_instance = NULL;
 197   _ArrayIndexOutOfBoundsException_instance = NULL;
 198   _ArrayStoreException_instance = NULL;
 199   _ClassCastException_instance = NULL;
 200   _the_null_string = NULL;
 201   _the_min_jint_string = NULL;
 202 
 203   _jvmti_can_hotswap_or_post_breakpoint = false;
 204   _jvmti_can_access_local_variables = false;
 205   _jvmti_can_post_on_exceptions = false;
 206   _jvmti_can_pop_frame = false;
 207 }
 208 
 209 ciEnv::~ciEnv() {
 210   GUARDED_VM_ENTRY(
 211       CompilerThread* current_thread = CompilerThread::current();
 212       _factory->remove_symbols();
 213       // Need safepoint to clear the env on the thread.  RedefineClasses might
 214       // be reading it.
 215       current_thread->set_env(NULL);
 216   )
 217 }
 218 
 219 // ------------------------------------------------------------------
 220 // Cache Jvmti state
 221 void ciEnv::cache_jvmti_state() {
 222   VM_ENTRY_MARK;
 223   // Get Jvmti capabilities under lock to get consistant values.
 224   MutexLocker mu(JvmtiThreadState_lock);
 225   _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
 226   _jvmti_can_access_local_variables     = JvmtiExport::can_access_local_variables();
 227   _jvmti_can_post_on_exceptions         = JvmtiExport::can_post_on_exceptions();
 228   _jvmti_can_pop_frame                  = JvmtiExport::can_pop_frame();
 229 }
 230 
 231 bool ciEnv::should_retain_local_variables() const {
 232   return _jvmti_can_access_local_variables || _jvmti_can_pop_frame;
 233 }
 234 
 235 bool ciEnv::jvmti_state_changed() const {
 236   if (!_jvmti_can_access_local_variables &&
 237       JvmtiExport::can_access_local_variables()) {
 238     return true;
 239   }
 240   if (!_jvmti_can_hotswap_or_post_breakpoint &&
 241       JvmtiExport::can_hotswap_or_post_breakpoint()) {
 242     return true;
 243   }
 244   if (!_jvmti_can_post_on_exceptions &&
 245       JvmtiExport::can_post_on_exceptions()) {
 246     return true;
 247   }
 248   if (!_jvmti_can_pop_frame &&
 249       JvmtiExport::can_pop_frame()) {
 250     return true;
 251   }
 252   return false;
 253 }
 254 
 255 // ------------------------------------------------------------------
 256 // Cache DTrace flags
 257 void ciEnv::cache_dtrace_flags() {
 258   // Need lock?
 259   _dtrace_extended_probes = ExtendedDTraceProbes;
 260   if (_dtrace_extended_probes) {
 261     _dtrace_monitor_probes  = true;
 262     _dtrace_method_probes   = true;
 263     _dtrace_alloc_probes    = true;
 264   } else {
 265     _dtrace_monitor_probes  = DTraceMonitorProbes;
 266     _dtrace_method_probes   = DTraceMethodProbes;
 267     _dtrace_alloc_probes    = DTraceAllocProbes;
 268   }
 269 }
 270 
 271 // ------------------------------------------------------------------
 272 // helper for lazy exception creation
 273 ciInstance* ciEnv::get_or_create_exception(jobject& handle, Symbol* name) {
 274   VM_ENTRY_MARK;
 275   if (handle == NULL) {
 276     // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
 277     Klass* k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
 278     jobject objh = NULL;
 279     if (!HAS_PENDING_EXCEPTION && k != NULL) {
 280       oop obj = InstanceKlass::cast(k)->allocate_instance(THREAD);
 281       if (!HAS_PENDING_EXCEPTION)
 282         objh = JNIHandles::make_global(Handle(THREAD, obj));
 283     }
 284     if (HAS_PENDING_EXCEPTION) {
 285       CLEAR_PENDING_EXCEPTION;
 286     } else {
 287       handle = objh;
 288     }
 289   }
 290   oop obj = JNIHandles::resolve(handle);
 291   return obj == NULL? NULL: get_object(obj)->as_instance();
 292 }
 293 
 294 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
 295   if (_ArrayIndexOutOfBoundsException_instance == NULL) {
 296     _ArrayIndexOutOfBoundsException_instance
 297           = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
 298           vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
 299   }
 300   return _ArrayIndexOutOfBoundsException_instance;
 301 }
 302 ciInstance* ciEnv::ArrayStoreException_instance() {
 303   if (_ArrayStoreException_instance == NULL) {
 304     _ArrayStoreException_instance
 305           = get_or_create_exception(_ArrayStoreException_handle,
 306           vmSymbols::java_lang_ArrayStoreException());
 307   }
 308   return _ArrayStoreException_instance;
 309 }
 310 ciInstance* ciEnv::ClassCastException_instance() {
 311   if (_ClassCastException_instance == NULL) {
 312     _ClassCastException_instance
 313           = get_or_create_exception(_ClassCastException_handle,
 314           vmSymbols::java_lang_ClassCastException());
 315   }
 316   return _ClassCastException_instance;
 317 }
 318 
 319 ciInstance* ciEnv::the_null_string() {
 320   if (_the_null_string == NULL) {
 321     VM_ENTRY_MARK;
 322     _the_null_string = get_object(Universe::the_null_string())->as_instance();
 323   }
 324   return _the_null_string;
 325 }
 326 
 327 ciInstance* ciEnv::the_min_jint_string() {
 328   if (_the_min_jint_string == NULL) {
 329     VM_ENTRY_MARK;
 330     _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance();
 331   }
 332   return _the_min_jint_string;
 333 }
 334 
 335 // ------------------------------------------------------------------
 336 // ciEnv::get_method_from_handle
 337 ciMethod* ciEnv::get_method_from_handle(Method* method) {
 338   VM_ENTRY_MARK;
 339   return get_metadata(method)->as_method();
 340 }
 341 
 342 // ------------------------------------------------------------------
 343 // ciEnv::array_element_offset_in_bytes
 344 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {
 345   VM_ENTRY_MARK;
 346   objArrayOop a = (objArrayOop)a_h->get_oop();
 347   assert(a->is_objArray(), "");
 348   int length = a->length();
 349   oop o = o_h->get_oop();
 350   for (int i = 0; i < length; i++) {
 351     if (a->obj_at(i) == o)  return i;
 352   }
 353   return -1;
 354 }
 355 
 356 
 357 // ------------------------------------------------------------------
 358 // ciEnv::check_klass_accessiblity
 359 //
 360 // Note: the logic of this method should mirror the logic of
 361 // ConstantPool::verify_constant_pool_resolve.
 362 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
 363                                       Klass* resolved_klass) {
 364   if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
 365     return true;
 366   }
 367   if (accessing_klass->is_obj_array_klass()) {
 368     accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
 369   }
 370   if (!accessing_klass->is_instance_klass()) {
 371     return true;
 372   }
 373 
 374   if (resolved_klass->is_objArray_klass()) {
 375     // Find the element klass, if this is an array.
 376     resolved_klass = ObjArrayKlass::cast(resolved_klass)->bottom_klass();
 377   }
 378   if (resolved_klass->is_instance_klass()) {
 379     return (Reflection::verify_class_access(accessing_klass->get_Klass(),
 380                                             InstanceKlass::cast(resolved_klass),
 381                                             true) == Reflection::ACCESS_OK);
 382   }
 383   return true;
 384 }
 385 
 386 // ------------------------------------------------------------------
 387 // ciEnv::get_klass_by_name_impl
 388 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
 389                                        const constantPoolHandle& cpool,
 390                                        ciSymbol* name,
 391                                        bool require_local) {
 392   ASSERT_IN_VM;
 393   EXCEPTION_CONTEXT;
 394 
 395   // Now we need to check the SystemDictionary
 396   Symbol* sym = name->get_symbol();
 397   if (sym->byte_at(0) == 'L' &&
 398     sym->byte_at(sym->utf8_length()-1) == ';') {
 399     // This is a name from a signature.  Strip off the trimmings.
 400     // Call recursive to keep scope of strippedsym.
 401     TempNewSymbol strippedsym = SymbolTable::new_symbol(sym->as_utf8()+1,
 402                     sym->utf8_length()-2,
 403                     KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
 404     ciSymbol* strippedname = get_symbol(strippedsym);
 405     return get_klass_by_name_impl(accessing_klass, cpool, strippedname, require_local);
 406   }
 407 
 408   // Check for prior unloaded klass.  The SystemDictionary's answers
 409   // can vary over time but the compiler needs consistency.
 410   ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
 411   if (unloaded_klass != NULL) {
 412     if (require_local)  return NULL;
 413     return unloaded_klass;
 414   }
 415 
 416   Handle loader(THREAD, (oop)NULL);
 417   Handle domain(THREAD, (oop)NULL);
 418   if (accessing_klass != NULL) {
 419     loader = Handle(THREAD, accessing_klass->loader());
 420     domain = Handle(THREAD, accessing_klass->protection_domain());
 421   }
 422 
 423   // setup up the proper type to return on OOM
 424   ciKlass* fail_type;
 425   if (sym->byte_at(0) == '[') {
 426     fail_type = _unloaded_ciobjarrayklass;
 427   } else {
 428     fail_type = _unloaded_ciinstance_klass;
 429   }
 430   Klass* found_klass;
 431   {
 432     ttyUnlocker ttyul;  // release tty lock to avoid ordering problems
 433     MutexLocker ml(Compile_lock);
 434     Klass* kls;
 435     if (!require_local) {
 436       kls = SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
 437                                                                        KILL_COMPILE_ON_FATAL_(fail_type));
 438     } else {
 439       kls = SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
 440                                                            KILL_COMPILE_ON_FATAL_(fail_type));
 441     }
 442     found_klass = kls;
 443   }
 444 
 445   // If we fail to find an array klass, look again for its element type.
 446   // The element type may be available either locally or via constraints.
 447   // In either case, if we can find the element type in the system dictionary,
 448   // we must build an array type around it.  The CI requires array klasses
 449   // to be loaded if their element klasses are loaded, except when memory
 450   // is exhausted.
 451   if (sym->byte_at(0) == '[' &&
 452       (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
 453     // We have an unloaded array.
 454     // Build it on the fly if the element class exists.
 455     TempNewSymbol elem_sym = SymbolTable::new_symbol(sym->as_utf8()+1,
 456                                                  sym->utf8_length()-1,
 457                                                  KILL_COMPILE_ON_FATAL_(fail_type));
 458 
 459     // Get element ciKlass recursively.
 460     ciKlass* elem_klass =
 461       get_klass_by_name_impl(accessing_klass,
 462                              cpool,
 463                              get_symbol(elem_sym),
 464                              require_local);
 465     if (elem_klass != NULL && elem_klass->is_loaded()) {
 466       // Now make an array for it
 467       return ciObjArrayKlass::make_impl(elem_klass);
 468     }
 469   }
 470 
 471   if (found_klass == NULL && !cpool.is_null() && cpool->has_preresolution()) {
 472     // Look inside the constant pool for pre-resolved class entries.
 473     for (int i = cpool->length() - 1; i >= 1; i--) {
 474       if (cpool->tag_at(i).is_klass()) {
 475         Klass* kls = cpool->resolved_klass_at(i);
 476         if (kls->name() == sym) {
 477           found_klass = kls;
 478           break;
 479         }
 480       }
 481     }
 482   }
 483 
 484   if (found_klass != NULL) {
 485     // Found it.  Build a CI handle.
 486     return get_klass(found_klass);
 487   }
 488 
 489   if (require_local)  return NULL;
 490 
 491   // Not yet loaded into the VM, or not governed by loader constraints.
 492   // Make a CI representative for it.
 493   return get_unloaded_klass(accessing_klass, name);
 494 }
 495 
 496 // ------------------------------------------------------------------
 497 // ciEnv::get_klass_by_name
 498 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
 499                                   ciSymbol* klass_name,
 500                                   bool require_local) {
 501   GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
 502                                                  constantPoolHandle(),
 503                                                  klass_name,
 504                                                  require_local);)
 505 }
 506 
 507 // ------------------------------------------------------------------
 508 // ciEnv::get_klass_by_index_impl
 509 //
 510 // Implementation of get_klass_by_index.
 511 ciKlass* ciEnv::get_klass_by_index_impl(const constantPoolHandle& cpool,
 512                                         int index,
 513                                         bool& is_accessible,
 514                                         ciInstanceKlass* accessor) {
 515   EXCEPTION_CONTEXT;
 516   Klass* klass = NULL;
 517   Symbol* klass_name = NULL;
 518 
 519   if (cpool->tag_at(index).is_symbol()) {
 520     klass_name = cpool->symbol_at(index);
 521   } else {
 522     // Check if it's resolved if it's not a symbol constant pool entry.
 523     klass =  ConstantPool::klass_at_if_loaded(cpool, index);
 524     // Try to look it up by name.
 525     if (klass == NULL) {
 526       klass_name = cpool->klass_name_at(index);
 527     }
 528   }
 529 
 530   if (klass == NULL) {
 531     // Not found in constant pool.  Use the name to do the lookup.
 532     ciKlass* k = get_klass_by_name_impl(accessor,
 533                                         cpool,
 534                                         get_symbol(klass_name),
 535                                         false);
 536     // Calculate accessibility the hard way.
 537     if (!k->is_loaded()) {
 538       is_accessible = false;
 539     } else if (k->loader() != accessor->loader() &&
 540                get_klass_by_name_impl(accessor, cpool, k->name(), true) == NULL) {
 541       // Loaded only remotely.  Not linked yet.
 542       is_accessible = false;
 543     } else {
 544       // Linked locally, and we must also check public/private, etc.
 545       is_accessible = check_klass_accessibility(accessor, k->get_Klass());
 546     }
 547     return k;
 548   }
 549 
 550   // Check for prior unloaded klass.  The SystemDictionary's answers
 551   // can vary over time but the compiler needs consistency.
 552   ciSymbol* name = get_symbol(klass->name());
 553   ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
 554   if (unloaded_klass != NULL) {
 555     is_accessible = false;
 556     return unloaded_klass;
 557   }
 558 
 559   // It is known to be accessible, since it was found in the constant pool.
 560   is_accessible = true;
 561   return get_klass(klass);
 562 }
 563 
 564 // ------------------------------------------------------------------
 565 // ciEnv::get_klass_by_index
 566 //
 567 // Get a klass from the constant pool.
 568 ciKlass* ciEnv::get_klass_by_index(const constantPoolHandle& cpool,
 569                                    int index,
 570                                    bool& is_accessible,
 571                                    ciInstanceKlass* accessor) {
 572   GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);)
 573 }
 574 
 575 // ------------------------------------------------------------------
 576 // ciEnv::get_constant_by_index_impl
 577 //
 578 // Implementation of get_constant_by_index().
 579 ciConstant ciEnv::get_constant_by_index_impl(const constantPoolHandle& cpool,
 580                                              int pool_index, int cache_index,
 581                                              ciInstanceKlass* accessor) {
 582   bool ignore_will_link;
 583   EXCEPTION_CONTEXT;
 584   int index = pool_index;
 585   if (cache_index >= 0) {
 586     assert(index < 0, "only one kind of index at a time");
 587     oop obj = cpool->resolved_references()->obj_at(cache_index);
 588     if (obj != NULL) {
 589       ciObject* ciobj = get_object(obj);
 590       if (ciobj->is_array()) {
 591         return ciConstant(T_ARRAY, ciobj);
 592       } else {
 593         assert(ciobj->is_instance(), "should be an instance");
 594         return ciConstant(T_OBJECT, ciobj);
 595       }
 596     }
 597     index = cpool->object_to_cp_index(cache_index);
 598   }
 599   constantTag tag = cpool->tag_at(index);
 600   if (tag.is_int()) {
 601     return ciConstant(T_INT, (jint)cpool->int_at(index));
 602   } else if (tag.is_long()) {
 603     return ciConstant((jlong)cpool->long_at(index));
 604   } else if (tag.is_float()) {
 605     return ciConstant((jfloat)cpool->float_at(index));
 606   } else if (tag.is_double()) {
 607     return ciConstant((jdouble)cpool->double_at(index));
 608   } else if (tag.is_string()) {
 609     oop string = NULL;
 610     assert(cache_index >= 0, "should have a cache index");
 611     if (cpool->is_pseudo_string_at(index)) {
 612       string = cpool->pseudo_string_at(index, cache_index);
 613     } else {
 614       string = cpool->string_at(index, cache_index, THREAD);
 615       if (HAS_PENDING_EXCEPTION) {
 616         CLEAR_PENDING_EXCEPTION;
 617         record_out_of_memory_failure();
 618         return ciConstant();
 619       }
 620     }
 621     ciObject* constant = get_object(string);
 622     if (constant->is_array()) {
 623       return ciConstant(T_ARRAY, constant);
 624     } else {
 625       assert (constant->is_instance(), "must be an instance, or not? ");
 626       return ciConstant(T_OBJECT, constant);
 627     }
 628   } else if (tag.is_klass() || tag.is_unresolved_klass()) {
 629     // 4881222: allow ldc to take a class type
 630     ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore_will_link, accessor);
 631     if (HAS_PENDING_EXCEPTION) {
 632       CLEAR_PENDING_EXCEPTION;
 633       record_out_of_memory_failure();
 634       return ciConstant();
 635     }
 636     assert (klass->is_instance_klass() || klass->is_array_klass(),
 637             "must be an instance or array klass ");
 638     return ciConstant(T_OBJECT, klass->java_mirror());
 639   } else if (tag.is_method_type()) {
 640     // must execute Java code to link this CP entry into cache[i].f1
 641     ciSymbol* signature = get_symbol(cpool->method_type_signature_at(index));
 642     ciObject* ciobj = get_unloaded_method_type_constant(signature);
 643     return ciConstant(T_OBJECT, ciobj);
 644   } else if (tag.is_method_handle()) {
 645     // must execute Java code to link this CP entry into cache[i].f1
 646     int ref_kind        = cpool->method_handle_ref_kind_at(index);
 647     int callee_index    = cpool->method_handle_klass_index_at(index);
 648     ciKlass* callee     = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor);
 649     ciSymbol* name      = get_symbol(cpool->method_handle_name_ref_at(index));
 650     ciSymbol* signature = get_symbol(cpool->method_handle_signature_ref_at(index));
 651     ciObject* ciobj     = get_unloaded_method_handle_constant(callee, name, signature, ref_kind);
 652     return ciConstant(T_OBJECT, ciobj);
 653   } else {
 654     ShouldNotReachHere();
 655     return ciConstant();
 656   }
 657 }
 658 
 659 // ------------------------------------------------------------------
 660 // ciEnv::get_constant_by_index
 661 //
 662 // Pull a constant out of the constant pool.  How appropriate.
 663 //
 664 // Implementation note: this query is currently in no way cached.
 665 ciConstant ciEnv::get_constant_by_index(const constantPoolHandle& cpool,
 666                                         int pool_index, int cache_index,
 667                                         ciInstanceKlass* accessor) {
 668   GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);)
 669 }
 670 
 671 // ------------------------------------------------------------------
 672 // ciEnv::get_field_by_index_impl
 673 //
 674 // Implementation of get_field_by_index.
 675 //
 676 // Implementation note: the results of field lookups are cached
 677 // in the accessor klass.
 678 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
 679                                         int index) {
 680   ciConstantPoolCache* cache = accessor->field_cache();
 681   if (cache == NULL) {
 682     ciField* field = new (arena()) ciField(accessor, index);
 683     return field;
 684   } else {
 685     ciField* field = (ciField*)cache->get(index);
 686     if (field == NULL) {
 687       field = new (arena()) ciField(accessor, index);
 688       cache->insert(index, field);
 689     }
 690     return field;
 691   }
 692 }
 693 
 694 // ------------------------------------------------------------------
 695 // ciEnv::get_field_by_index
 696 //
 697 // Get a field by index from a klass's constant pool.
 698 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
 699                                    int index) {
 700   GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
 701 }
 702 
 703 // ------------------------------------------------------------------
 704 // ciEnv::lookup_method
 705 //
 706 // Perform an appropriate method lookup based on accessor, holder,
 707 // name, signature, and bytecode.
 708 Method* ciEnv::lookup_method(ciInstanceKlass* accessor,
 709                              ciKlass*         holder,
 710                              Symbol*          name,
 711                              Symbol*          sig,
 712                              Bytecodes::Code  bc,
 713                              constantTag      tag) {
 714   // Accessibility checks are performed in ciEnv::get_method_by_index_impl.
 715   assert(check_klass_accessibility(accessor, holder->get_Klass()), "holder not accessible");
 716 
 717   InstanceKlass* accessor_klass = accessor->get_instanceKlass();
 718   Klass* holder_klass = holder->get_Klass();
 719   methodHandle dest_method;
 720   LinkInfo link_info(holder_klass, name, sig, accessor_klass, LinkInfo::needs_access_check, tag);
 721   switch (bc) {
 722   case Bytecodes::_invokestatic:
 723     dest_method =
 724       LinkResolver::resolve_static_call_or_null(link_info);
 725     break;
 726   case Bytecodes::_invokespecial:
 727     dest_method =
 728       LinkResolver::resolve_special_call_or_null(link_info);
 729     break;
 730   case Bytecodes::_invokeinterface:
 731     dest_method =
 732       LinkResolver::linktime_resolve_interface_method_or_null(link_info);
 733     break;
 734   case Bytecodes::_invokevirtual:
 735     dest_method =
 736       LinkResolver::linktime_resolve_virtual_method_or_null(link_info);
 737     break;
 738   default: ShouldNotReachHere();
 739   }
 740 
 741   return dest_method();
 742 }
 743 
 744 
 745 // ------------------------------------------------------------------
 746 // ciEnv::get_method_by_index_impl
 747 ciMethod* ciEnv::get_method_by_index_impl(const constantPoolHandle& cpool,
 748                                           int index, Bytecodes::Code bc,
 749                                           ciInstanceKlass* accessor) {
 750   if (bc == Bytecodes::_invokedynamic) {
 751     ConstantPoolCacheEntry* cpce = cpool->invokedynamic_cp_cache_entry_at(index);
 752     bool is_resolved = !cpce->is_f1_null();
 753     // FIXME: code generation could allow for null (unlinked) call site
 754     // The call site could be made patchable as follows:
 755     // Load the appendix argument from the constant pool.
 756     // Test the appendix argument and jump to a known deopt routine if it is null.
 757     // Jump through a patchable call site, which is initially a deopt routine.
 758     // Patch the call site to the nmethod entry point of the static compiled lambda form.
 759     // As with other two-component call sites, both values must be independently verified.
 760 
 761     if (is_resolved) {
 762       // Get the invoker Method* from the constant pool.
 763       // (The appendix argument, if any, will be noted in the method's signature.)
 764       Method* adapter = cpce->f1_as_method();
 765       return get_method(adapter);
 766     }
 767 
 768     // Fake a method that is equivalent to a declared method.
 769     ciInstanceKlass* holder    = get_instance_klass(SystemDictionary::MethodHandle_klass());
 770     ciSymbol*        name      = ciSymbol::invokeBasic_name();
 771     ciSymbol*        signature = get_symbol(cpool->signature_ref_at(index));
 772     return get_unloaded_method(holder, name, signature, accessor);
 773   } else {
 774     const int holder_index = cpool->klass_ref_index_at(index);
 775     bool holder_is_accessible;
 776     ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
 777 
 778     // Get the method's name and signature.
 779     Symbol* name_sym = cpool->name_ref_at(index);
 780     Symbol* sig_sym  = cpool->signature_ref_at(index);
 781 
 782     if (cpool->has_preresolution()
 783         || ((holder == ciEnv::MethodHandle_klass() || holder == ciEnv::VarHandle_klass()) &&
 784             MethodHandles::is_signature_polymorphic_name(holder->get_Klass(), name_sym))) {
 785       // Short-circuit lookups for JSR 292-related call sites.
 786       // That is, do not rely only on name-based lookups, because they may fail
 787       // if the names are not resolvable in the boot class loader (7056328).
 788       switch (bc) {
 789       case Bytecodes::_invokevirtual:
 790       case Bytecodes::_invokeinterface:
 791       case Bytecodes::_invokespecial:
 792       case Bytecodes::_invokestatic:
 793         {
 794           Method* m = ConstantPool::method_at_if_loaded(cpool, index);
 795           if (m != NULL) {
 796             return get_method(m);
 797           }
 798         }
 799         break;
 800       }
 801     }
 802 
 803     if (holder_is_accessible) {  // Our declared holder is loaded.
 804       constantTag tag = cpool->tag_ref_at(index);
 805       assert(accessor->get_instanceKlass() == cpool->pool_holder(), "not the pool holder?");
 806       Method* m = lookup_method(accessor, holder, name_sym, sig_sym, bc, tag);
 807       if (m != NULL &&
 808           (bc == Bytecodes::_invokestatic
 809            ?  m->method_holder()->is_not_initialized()
 810            : !m->method_holder()->is_loaded())) {
 811         m = NULL;
 812       }
 813 #ifdef ASSERT
 814       if (m != NULL && ReplayCompiles && !ciReplay::is_loaded(m)) {
 815         m = NULL;
 816       }
 817 #endif
 818       if (m != NULL) {
 819         // We found the method.
 820         return get_method(m);
 821       }
 822     }
 823 
 824     // Either the declared holder was not loaded, or the method could
 825     // not be found.  Create a dummy ciMethod to represent the failed
 826     // lookup.
 827     ciSymbol* name      = get_symbol(name_sym);
 828     ciSymbol* signature = get_symbol(sig_sym);
 829     return get_unloaded_method(holder, name, signature, accessor);
 830   }
 831 }
 832 
 833 
 834 // ------------------------------------------------------------------
 835 // ciEnv::get_instance_klass_for_declared_method_holder
 836 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
 837   // For the case of <array>.clone(), the method holder can be a ciArrayKlass
 838   // instead of a ciInstanceKlass.  For that case simply pretend that the
 839   // declared holder is Object.clone since that's where the call will bottom out.
 840   // A more correct fix would trickle out through many interfaces in CI,
 841   // requiring ciInstanceKlass* to become ciKlass* and many more places would
 842   // require checks to make sure the expected type was found.  Given that this
 843   // only occurs for clone() the more extensive fix seems like overkill so
 844   // instead we simply smear the array type into Object.
 845   guarantee(method_holder != NULL, "no method holder");
 846   if (method_holder->is_instance_klass()) {
 847     return method_holder->as_instance_klass();
 848   } else if (method_holder->is_array_klass()) {
 849     return current()->Object_klass();
 850   } else {
 851     ShouldNotReachHere();
 852   }
 853   return NULL;
 854 }
 855 
 856 
 857 // ------------------------------------------------------------------
 858 // ciEnv::get_method_by_index
 859 ciMethod* ciEnv::get_method_by_index(const constantPoolHandle& cpool,
 860                                      int index, Bytecodes::Code bc,
 861                                      ciInstanceKlass* accessor) {
 862   GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);)
 863 }
 864 
 865 
 866 // ------------------------------------------------------------------
 867 // ciEnv::name_buffer
 868 char *ciEnv::name_buffer(int req_len) {
 869   if (_name_buffer_len < req_len) {
 870     if (_name_buffer == NULL) {
 871       _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
 872       _name_buffer_len = req_len;
 873     } else {
 874       _name_buffer =
 875         (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
 876       _name_buffer_len = req_len;
 877     }
 878   }
 879   return _name_buffer;
 880 }
 881 
 882 // ------------------------------------------------------------------
 883 // ciEnv::is_in_vm
 884 bool ciEnv::is_in_vm() {
 885   return JavaThread::current()->thread_state() == _thread_in_vm;
 886 }
 887 
 888 bool ciEnv::system_dictionary_modification_counter_changed() {
 889   return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
 890 }
 891 
 892 // ------------------------------------------------------------------
 893 // ciEnv::validate_compile_task_dependencies
 894 //
 895 // Check for changes during compilation (e.g. class loads, evolution,
 896 // breakpoints, call site invalidation).
 897 void ciEnv::validate_compile_task_dependencies(ciMethod* target) {
 898   if (failing())  return;  // no need for further checks
 899 
 900   // First, check non-klass dependencies as we might return early and
 901   // not check klass dependencies if the system dictionary
 902   // modification counter hasn't changed (see below).
 903   for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
 904     if (deps.is_klass_type())  continue;  // skip klass dependencies
 905     Klass* witness = deps.check_dependency();
 906     if (witness != NULL) {
 907       if (deps.type() == Dependencies::call_site_target_value) {
 908         _inc_decompile_count_on_failure = false;
 909         record_failure("call site target change");
 910       } else {
 911         record_failure("invalid non-klass dependency");
 912       }
 913       return;
 914     }
 915   }
 916 
 917   // Klass dependencies must be checked when the system dictionary
 918   // changes.  If logging is enabled all violated dependences will be
 919   // recorded in the log.  In debug mode check dependencies even if
 920   // the system dictionary hasn't changed to verify that no invalid
 921   // dependencies were inserted.  Any violated dependences in this
 922   // case are dumped to the tty.
 923   bool counter_changed = system_dictionary_modification_counter_changed();
 924 
 925   bool verify_deps = trueInDebug;
 926   if (!counter_changed && !verify_deps)  return;
 927 
 928   int klass_violations = 0;
 929   for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
 930     if (!deps.is_klass_type())  continue;  // skip non-klass dependencies
 931     Klass* witness = deps.check_dependency();
 932     if (witness != NULL) {
 933       klass_violations++;
 934       if (!counter_changed) {
 935         // Dependence failed but counter didn't change.  Log a message
 936         // describing what failed and allow the assert at the end to
 937         // trigger.
 938         deps.print_dependency(witness);
 939       } else if (xtty == NULL) {
 940         // If we're not logging then a single violation is sufficient,
 941         // otherwise we want to log all the dependences which were
 942         // violated.
 943         break;
 944       }
 945     }
 946   }
 947 
 948   if (klass_violations != 0) {
 949 #ifdef ASSERT
 950     if (!counter_changed && !PrintCompilation) {
 951       // Print out the compile task that failed
 952       _task->print_tty();
 953     }
 954 #endif
 955     assert(counter_changed, "failed dependencies, but counter didn't change");
 956     record_failure("concurrent class loading");
 957   }
 958 }
 959 
 960 // ------------------------------------------------------------------
 961 // ciEnv::register_method
 962 void ciEnv::register_method(ciMethod* target,
 963                             int entry_bci,
 964                             CodeOffsets* offsets,
 965                             int orig_pc_offset,
 966                             CodeBuffer* code_buffer,
 967                             int frame_words,
 968                             OopMapSet* oop_map_set,
 969                             ExceptionHandlerTable* handler_table,
 970                             ImplicitExceptionTable* inc_table,
 971                             AbstractCompiler* compiler,
 972                             bool has_unsafe_access,
 973                             bool has_wide_vectors,
 974                             RTMState  rtm_state) {
 975   VM_ENTRY_MARK;
 976   nmethod* nm = NULL;
 977   {
 978     // To prevent compile queue updates.
 979     MutexLocker locker(MethodCompileQueue_lock, THREAD);
 980 
 981     // Prevent SystemDictionary::add_to_hierarchy from running
 982     // and invalidating our dependencies until we install this method.
 983     // No safepoints are allowed. Otherwise, class redefinition can occur in between.
 984     MutexLocker ml(Compile_lock);
 985     NoSafepointVerifier nsv;
 986 
 987     // Change in Jvmti state may invalidate compilation.
 988     if (!failing() && jvmti_state_changed()) {
 989       record_failure("Jvmti state change invalidated dependencies");
 990     }
 991 
 992     // Change in DTrace flags may invalidate compilation.
 993     if (!failing() &&
 994         ( (!dtrace_extended_probes() && ExtendedDTraceProbes) ||
 995           (!dtrace_method_probes() && DTraceMethodProbes) ||
 996           (!dtrace_alloc_probes() && DTraceAllocProbes) )) {
 997       record_failure("DTrace flags change invalidated dependencies");
 998     }
 999 
1000     if (!failing()) {
1001       if (log() != NULL) {
1002         // Log the dependencies which this compilation declares.
1003         dependencies()->log_all_dependencies();
1004       }
1005 
1006       // Encode the dependencies now, so we can check them right away.
1007       dependencies()->encode_content_bytes();
1008 
1009       // Check for {class loads, evolution, breakpoints, ...} during compilation
1010       validate_compile_task_dependencies(target);
1011     }
1012 
1013     methodHandle method(THREAD, target->get_Method());
1014 
1015 #if INCLUDE_RTM_OPT
1016     if (!failing() && (rtm_state != NoRTM) &&
1017         (method()->method_data() != NULL) &&
1018         (method()->method_data()->rtm_state() != rtm_state)) {
1019       // Preemptive decompile if rtm state was changed.
1020       record_failure("RTM state change invalidated rtm code");
1021     }
1022 #endif
1023 
1024     if (failing()) {
1025       // While not a true deoptimization, it is a preemptive decompile.
1026       MethodData* mdo = method()->method_data();
1027       if (mdo != NULL && _inc_decompile_count_on_failure) {
1028         mdo->inc_decompile_count();
1029       }
1030 
1031       // All buffers in the CodeBuffer are allocated in the CodeCache.
1032       // If the code buffer is created on each compile attempt
1033       // as in C2, then it must be freed.
1034       code_buffer->free_blob();
1035       return;
1036     }
1037 
1038     assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
1039     assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
1040 
1041     nm =  nmethod::new_nmethod(method,
1042                                compile_id(),
1043                                entry_bci,
1044                                offsets,
1045                                orig_pc_offset,
1046                                debug_info(), dependencies(), code_buffer,
1047                                frame_words, oop_map_set,
1048                                handler_table, inc_table,
1049                                compiler, task()->comp_level());
1050 
1051     // Free codeBlobs
1052     code_buffer->free_blob();
1053 
1054     if (nm != NULL) {
1055       nm->set_has_unsafe_access(has_unsafe_access);
1056       nm->set_has_wide_vectors(has_wide_vectors);
1057 #if INCLUDE_RTM_OPT
1058       nm->set_rtm_state(rtm_state);
1059 #endif
1060 
1061       // Record successful registration.
1062       // (Put nm into the task handle *before* publishing to the Java heap.)
1063       if (task() != NULL) {
1064         task()->set_code(nm);
1065       }
1066 
1067       if (entry_bci == InvocationEntryBci) {
1068         if (TieredCompilation) {
1069           // If there is an old version we're done with it
1070           CompiledMethod* old = method->code();
1071           if (TraceMethodReplacement && old != NULL) {
1072             ResourceMark rm;
1073             char *method_name = method->name_and_sig_as_C_string();
1074             tty->print_cr("Replacing method %s", method_name);
1075           }
1076           if (old != NULL) {
1077             old->make_not_used();
1078           }
1079         }
1080         if (TraceNMethodInstalls) {
1081           ResourceMark rm;
1082           char *method_name = method->name_and_sig_as_C_string();
1083           ttyLocker ttyl;
1084           tty->print_cr("Installing method (%d) %s ",
1085                         task()->comp_level(),
1086                         method_name);
1087         }
1088         // Allow the code to be executed
1089         method->set_code(method, nm);
1090       } else {
1091         if (TraceNMethodInstalls) {
1092           ResourceMark rm;
1093           char *method_name = method->name_and_sig_as_C_string();
1094           ttyLocker ttyl;
1095           tty->print_cr("Installing osr method (%d) %s @ %d",
1096                         task()->comp_level(),
1097                         method_name,
1098                         entry_bci);
1099         }
1100         method->method_holder()->add_osr_nmethod(nm);
1101       }
1102     }
1103   }  // safepoints are allowed again
1104 
1105   if (nm != NULL) {
1106     // JVMTI -- compiled method notification (must be done outside lock)
1107     nm->post_compiled_method_load_event();
1108   } else {
1109     // The CodeCache is full.
1110     record_failure("code cache is full");
1111   }
1112 }
1113 
1114 
1115 // ------------------------------------------------------------------
1116 // ciEnv::find_system_klass
1117 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
1118   VM_ENTRY_MARK;
1119   return get_klass_by_name_impl(NULL, constantPoolHandle(), klass_name, false);
1120 }
1121 
1122 // ------------------------------------------------------------------
1123 // ciEnv::comp_level
1124 int ciEnv::comp_level() {
1125   if (task() == NULL)  return CompLevel_highest_tier;
1126   return task()->comp_level();
1127 }
1128 
1129 // ------------------------------------------------------------------
1130 // ciEnv::compile_id
1131 uint ciEnv::compile_id() {
1132   if (task() == NULL)  return 0;
1133   return task()->compile_id();
1134 }
1135 
1136 // ------------------------------------------------------------------
1137 // ciEnv::notice_inlined_method()
1138 void ciEnv::notice_inlined_method(ciMethod* method) {
1139   _num_inlined_bytecodes += method->code_size_for_inlining();
1140 }
1141 
1142 // ------------------------------------------------------------------
1143 // ciEnv::num_inlined_bytecodes()
1144 int ciEnv::num_inlined_bytecodes() const {
1145   return _num_inlined_bytecodes;
1146 }
1147 
1148 // ------------------------------------------------------------------
1149 // ciEnv::record_failure()
1150 void ciEnv::record_failure(const char* reason) {
1151   if (_failure_reason == NULL) {
1152     // Record the first failure reason.
1153     _failure_reason = reason;
1154   }
1155 }
1156 
1157 void ciEnv::report_failure(const char* reason) {
1158   // Create and fire JFR event
1159   EventCompilationFailure event;
1160   if (event.should_commit()) {
1161     event.set_compileId(compile_id());
1162     event.set_failureMessage(reason);
1163     event.commit();
1164   }
1165 }
1166 
1167 // ------------------------------------------------------------------
1168 // ciEnv::record_method_not_compilable()
1169 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
1170   int new_compilable =
1171     all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
1172 
1173   // Only note transitions to a worse state
1174   if (new_compilable > _compilable) {
1175     if (log() != NULL) {
1176       if (all_tiers) {
1177         log()->elem("method_not_compilable");
1178       } else {
1179         log()->elem("method_not_compilable_at_tier level='%d'",
1180                     current()->task()->comp_level());
1181       }
1182     }
1183     _compilable = new_compilable;
1184 
1185     // Reset failure reason; this one is more important.
1186     _failure_reason = NULL;
1187     record_failure(reason);
1188   }
1189 }
1190 
1191 // ------------------------------------------------------------------
1192 // ciEnv::record_out_of_memory_failure()
1193 void ciEnv::record_out_of_memory_failure() {
1194   // If memory is low, we stop compiling methods.
1195   record_method_not_compilable("out of memory");
1196 }
1197 
1198 ciInstance* ciEnv::unloaded_ciinstance() {
1199   GUARDED_VM_ENTRY(return _factory->get_unloaded_object_constant();)
1200 }
1201 
1202 // ------------------------------------------------------------------
1203 // ciEnv::dump_replay_data*
1204 
1205 // Don't change thread state and acquire any locks.
1206 // Safe to call from VM error reporter.
1207 
1208 void ciEnv::dump_compile_data(outputStream* out) {
1209   CompileTask* task = this->task();
1210   Method* method = task->method();
1211   int entry_bci = task->osr_bci();
1212   int comp_level = task->comp_level();
1213   out->print("compile %s %s %s %d %d",
1214                 method->klass_name()->as_quoted_ascii(),
1215                 method->name()->as_quoted_ascii(),
1216                 method->signature()->as_quoted_ascii(),
1217                 entry_bci, comp_level);
1218   if (compiler_data() != NULL) {
1219     if (is_c2_compile(comp_level)) { // C2 or Shark
1220 #ifdef COMPILER2
1221       // Dump C2 inlining data.
1222       ((Compile*)compiler_data())->dump_inline_data(out);
1223 #endif
1224     } else if (is_c1_compile(comp_level)) { // C1
1225 #ifdef COMPILER1
1226       // Dump C1 inlining data.
1227       ((Compilation*)compiler_data())->dump_inline_data(out);
1228 #endif
1229     }
1230   }
1231   out->cr();
1232 }
1233 
1234 void ciEnv::dump_replay_data_unsafe(outputStream* out) {
1235   ResourceMark rm;
1236 #if INCLUDE_JVMTI
1237   out->print_cr("JvmtiExport can_access_local_variables %d",     _jvmti_can_access_local_variables);
1238   out->print_cr("JvmtiExport can_hotswap_or_post_breakpoint %d", _jvmti_can_hotswap_or_post_breakpoint);
1239   out->print_cr("JvmtiExport can_post_on_exceptions %d",         _jvmti_can_post_on_exceptions);
1240 #endif // INCLUDE_JVMTI
1241 
1242   GrowableArray<ciMetadata*>* objects = _factory->get_ci_metadata();
1243   out->print_cr("# %d ciObject found", objects->length());
1244   for (int i = 0; i < objects->length(); i++) {
1245     objects->at(i)->dump_replay_data(out);
1246   }
1247   dump_compile_data(out);
1248   out->flush();
1249 }
1250 
1251 void ciEnv::dump_replay_data(outputStream* out) {
1252   GUARDED_VM_ENTRY(
1253     MutexLocker ml(Compile_lock);
1254     dump_replay_data_unsafe(out);
1255   )
1256 }
1257 
1258 void ciEnv::dump_replay_data(int compile_id) {
1259   static char buffer[O_BUFLEN];
1260   int ret = jio_snprintf(buffer, O_BUFLEN, "replay_pid%p_compid%d.log", os::current_process_id(), compile_id);
1261   if (ret > 0) {
1262     int fd = open(buffer, O_RDWR | O_CREAT | O_TRUNC, 0666);
1263     if (fd != -1) {
1264       FILE* replay_data_file = os::open(fd, "w");
1265       if (replay_data_file != NULL) {
1266         fileStream replay_data_stream(replay_data_file, /*need_close=*/true);
1267         dump_replay_data(&replay_data_stream);
1268         tty->print_cr("# Compiler replay data is saved as: %s", buffer);
1269       } else {
1270         tty->print_cr("# Can't open file to dump replay data.");
1271       }
1272     }
1273   }
1274 }
1275 
1276 void ciEnv::dump_inline_data(int compile_id) {
1277   static char buffer[O_BUFLEN];
1278   int ret = jio_snprintf(buffer, O_BUFLEN, "inline_pid%p_compid%d.log", os::current_process_id(), compile_id);
1279   if (ret > 0) {
1280     int fd = open(buffer, O_RDWR | O_CREAT | O_TRUNC, 0666);
1281     if (fd != -1) {
1282       FILE* inline_data_file = os::open(fd, "w");
1283       if (inline_data_file != NULL) {
1284         fileStream replay_data_stream(inline_data_file, /*need_close=*/true);
1285         GUARDED_VM_ENTRY(
1286           MutexLocker ml(Compile_lock);
1287           dump_compile_data(&replay_data_stream);
1288         )
1289         replay_data_stream.flush();
1290         tty->print("# Compiler inline data is saved as: ");
1291         tty->print_cr("%s", buffer);
1292       } else {
1293         tty->print_cr("# Can't open file to dump inline data.");
1294       }
1295     }
1296   }
1297 }