1 /*
   2  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "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/scopeDesc.hpp"
  38 #include "compiler/compileBroker.hpp"
  39 #include "compiler/compileLog.hpp"
  40 #include "compiler/compilerOracle.hpp"
  41 #include "gc_interface/collectedHeap.inline.hpp"
  42 #include "interpreter/linkResolver.hpp"
  43 #include "memory/allocation.inline.hpp"
  44 #include "memory/oopFactory.hpp"
  45 #include "memory/universe.inline.hpp"
  46 #include "oops/methodData.hpp"
  47 #include "oops/objArrayKlass.hpp"
  48 #include "oops/oop.inline.hpp"
  49 #include "oops/oop.inline2.hpp"
  50 #include "prims/jvmtiExport.hpp"
  51 #include "runtime/init.hpp"
  52 #include "runtime/reflection.hpp"
  53 #include "runtime/sharedRuntime.hpp"
  54 #include "utilities/dtrace.hpp"
  55 #include "utilities/macros.hpp"
  56 #ifdef COMPILER1
  57 #include "c1/c1_Runtime1.hpp"
  58 #endif
  59 #ifdef COMPILER2
  60 #include "opto/runtime.hpp"
  61 #endif
  62 
  63 // ciEnv
  64 //
  65 // This class is the top level broker for requests from the compiler
  66 // to the VM.
  67 
  68 ciObject*              ciEnv::_null_object_instance;
  69 
  70 #define WK_KLASS_DEFN(name, ignore_s, ignore_o) ciInstanceKlass* ciEnv::_##name = NULL;
  71 WK_KLASSES_DO(WK_KLASS_DEFN)
  72 #undef WK_KLASS_DEFN
  73 
  74 ciSymbol*        ciEnv::_unloaded_cisymbol = NULL;
  75 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
  76 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
  77 
  78 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
  79 jobject ciEnv::_ArrayStoreException_handle = NULL;
  80 jobject ciEnv::_ClassCastException_handle = NULL;
  81 
  82 #ifndef PRODUCT
  83 static bool firstEnv = true;
  84 #endif /* PRODUCT */
  85 
  86 // ------------------------------------------------------------------
  87 // ciEnv::ciEnv
  88 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {
  89   VM_ENTRY_MARK;
  90 
  91   // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
  92   thread->set_env(this);
  93   assert(ciEnv::current() == this, "sanity");
  94 
  95   _oop_recorder = NULL;
  96   _debug_info = NULL;
  97   _dependencies = NULL;
  98   _failure_reason = NULL;
  99   _compilable = MethodCompilable;
 100   _break_at_compile = false;
 101   _compiler_data = NULL;
 102 #ifndef PRODUCT
 103   assert(!firstEnv, "not initialized properly");
 104 #endif /* !PRODUCT */
 105 
 106   _system_dictionary_modification_counter = system_dictionary_modification_counter;
 107   _num_inlined_bytecodes = 0;
 108   assert(task == NULL || thread->task() == task, "sanity");
 109   _task = task;
 110   _log = NULL;
 111 
 112   // Temporary buffer for creating symbols and such.
 113   _name_buffer = NULL;
 114   _name_buffer_len = 0;
 115 
 116   _arena   = &_ciEnv_arena;
 117   _factory = new (_arena) ciObjectFactory(_arena, 128);
 118 
 119   // Preload commonly referenced system ciObjects.
 120 
 121   // During VM initialization, these instances have not yet been created.
 122   // Assertions ensure that these instances are not accessed before
 123   // their initialization.
 124 
 125   assert(Universe::is_fully_initialized(), "should be complete");
 126 
 127   oop o = Universe::null_ptr_exception_instance();
 128   assert(o != NULL, "should have been initialized");
 129   _NullPointerException_instance = get_object(o)->as_instance();
 130   o = Universe::arithmetic_exception_instance();
 131   assert(o != NULL, "should have been initialized");
 132   _ArithmeticException_instance = get_object(o)->as_instance();
 133 
 134   _ArrayIndexOutOfBoundsException_instance = NULL;
 135   _ArrayStoreException_instance = NULL;
 136   _ClassCastException_instance = NULL;
 137   _the_null_string = NULL;
 138   _the_min_jint_string = NULL;
 139 
 140   _jvmti_can_hotswap_or_post_breakpoint = false;
 141   _jvmti_can_access_local_variables = false;
 142   _jvmti_can_post_on_exceptions = false;
 143   _jvmti_can_pop_frame = false;
 144 }
 145 
 146 ciEnv::ciEnv(Arena* arena) {
 147   ASSERT_IN_VM;
 148 
 149   // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
 150   CompilerThread* current_thread = CompilerThread::current();
 151   assert(current_thread->env() == NULL, "must be");
 152   current_thread->set_env(this);
 153   assert(ciEnv::current() == this, "sanity");
 154 
 155   _oop_recorder = NULL;
 156   _debug_info = NULL;
 157   _dependencies = NULL;
 158   _failure_reason = NULL;
 159   _compilable = MethodCompilable_never;
 160   _break_at_compile = false;
 161   _compiler_data = NULL;
 162 #ifndef PRODUCT
 163   assert(firstEnv, "must be first");
 164   firstEnv = false;
 165 #endif /* !PRODUCT */
 166 
 167   _system_dictionary_modification_counter = 0;
 168   _num_inlined_bytecodes = 0;
 169   _task = NULL;
 170   _log = NULL;
 171 
 172   // Temporary buffer for creating symbols and such.
 173   _name_buffer = NULL;
 174   _name_buffer_len = 0;
 175 
 176   _arena   = arena;
 177   _factory = new (_arena) ciObjectFactory(_arena, 128);
 178 
 179   // Preload commonly referenced system ciObjects.
 180 
 181   // During VM initialization, these instances have not yet been created.
 182   // Assertions ensure that these instances are not accessed before
 183   // their initialization.
 184 
 185   assert(Universe::is_fully_initialized(), "must be");
 186 
 187   _NullPointerException_instance = NULL;
 188   _ArithmeticException_instance = NULL;
 189   _ArrayIndexOutOfBoundsException_instance = NULL;
 190   _ArrayStoreException_instance = NULL;
 191   _ClassCastException_instance = NULL;
 192   _the_null_string = NULL;
 193   _the_min_jint_string = NULL;
 194 
 195   _jvmti_can_hotswap_or_post_breakpoint = false;
 196   _jvmti_can_access_local_variables = false;
 197   _jvmti_can_post_on_exceptions = false;
 198   _jvmti_can_pop_frame = false;
 199 }
 200 
 201 ciEnv::~ciEnv() {
 202   CompilerThread* current_thread = CompilerThread::current();
 203   _factory->remove_symbols();
 204   // Need safepoint to clear the env on the thread.  RedefineClasses might
 205   // be reading it.
 206   GUARDED_VM_ENTRY(current_thread->set_env(NULL);)
 207 }
 208 
 209 // ------------------------------------------------------------------
 210 // Cache Jvmti state
 211 void ciEnv::cache_jvmti_state() {
 212   VM_ENTRY_MARK;
 213   // Get Jvmti capabilities under lock to get consistant values.
 214   MutexLocker mu(JvmtiThreadState_lock);
 215   _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
 216   _jvmti_can_access_local_variables     = JvmtiExport::can_access_local_variables();
 217   _jvmti_can_post_on_exceptions         = JvmtiExport::can_post_on_exceptions();
 218   _jvmti_can_pop_frame                  = JvmtiExport::can_pop_frame();
 219 }
 220 
 221 bool ciEnv::should_retain_local_variables() const {
 222   return _jvmti_can_access_local_variables || _jvmti_can_pop_frame;
 223 }
 224 
 225 bool ciEnv::jvmti_state_changed() const {
 226   if (!_jvmti_can_access_local_variables &&
 227       JvmtiExport::can_access_local_variables()) {
 228     return true;
 229   }
 230   if (!_jvmti_can_hotswap_or_post_breakpoint &&
 231       JvmtiExport::can_hotswap_or_post_breakpoint()) {
 232     return true;
 233   }
 234   if (!_jvmti_can_post_on_exceptions &&
 235       JvmtiExport::can_post_on_exceptions()) {
 236     return true;
 237   }
 238   if (!_jvmti_can_pop_frame &&
 239       JvmtiExport::can_pop_frame()) {
 240     return true;
 241   }
 242   return false;
 243 }
 244 
 245 // ------------------------------------------------------------------
 246 // Cache DTrace flags
 247 void ciEnv::cache_dtrace_flags() {
 248   // Need lock?
 249   _dtrace_extended_probes = ExtendedDTraceProbes;
 250   if (_dtrace_extended_probes) {
 251     _dtrace_monitor_probes  = true;
 252     _dtrace_method_probes   = true;
 253     _dtrace_alloc_probes    = true;
 254   } else {
 255     _dtrace_monitor_probes  = DTraceMonitorProbes;
 256     _dtrace_method_probes   = DTraceMethodProbes;
 257     _dtrace_alloc_probes    = DTraceAllocProbes;
 258   }
 259 }
 260 
 261 // ------------------------------------------------------------------
 262 // helper for lazy exception creation
 263 ciInstance* ciEnv::get_or_create_exception(jobject& handle, Symbol* name) {
 264   VM_ENTRY_MARK;
 265   if (handle == NULL) {
 266     // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
 267     Klass* k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
 268     jobject objh = NULL;
 269     if (!HAS_PENDING_EXCEPTION && k != NULL) {
 270       oop obj = InstanceKlass::cast(k)->allocate_instance(THREAD);
 271       if (!HAS_PENDING_EXCEPTION)
 272         objh = JNIHandles::make_global(obj);
 273     }
 274     if (HAS_PENDING_EXCEPTION) {
 275       CLEAR_PENDING_EXCEPTION;
 276     } else {
 277       handle = objh;
 278     }
 279   }
 280   oop obj = JNIHandles::resolve(handle);
 281   return obj == NULL? NULL: get_object(obj)->as_instance();
 282 }
 283 
 284 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
 285   if (_ArrayIndexOutOfBoundsException_instance == NULL) {
 286     _ArrayIndexOutOfBoundsException_instance
 287           = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
 288           vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
 289   }
 290   return _ArrayIndexOutOfBoundsException_instance;
 291 }
 292 ciInstance* ciEnv::ArrayStoreException_instance() {
 293   if (_ArrayStoreException_instance == NULL) {
 294     _ArrayStoreException_instance
 295           = get_or_create_exception(_ArrayStoreException_handle,
 296           vmSymbols::java_lang_ArrayStoreException());
 297   }
 298   return _ArrayStoreException_instance;
 299 }
 300 ciInstance* ciEnv::ClassCastException_instance() {
 301   if (_ClassCastException_instance == NULL) {
 302     _ClassCastException_instance
 303           = get_or_create_exception(_ClassCastException_handle,
 304           vmSymbols::java_lang_ClassCastException());
 305   }
 306   return _ClassCastException_instance;
 307 }
 308 
 309 ciInstance* ciEnv::the_null_string() {
 310   if (_the_null_string == NULL) {
 311     VM_ENTRY_MARK;
 312     _the_null_string = get_object(Universe::the_null_string())->as_instance();
 313   }
 314   return _the_null_string;
 315 }
 316 
 317 ciInstance* ciEnv::the_min_jint_string() {
 318   if (_the_min_jint_string == NULL) {
 319     VM_ENTRY_MARK;
 320     _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance();
 321   }
 322   return _the_min_jint_string;
 323 }
 324 
 325 // ------------------------------------------------------------------
 326 // ciEnv::get_method_from_handle
 327 ciMethod* ciEnv::get_method_from_handle(Method* method) {
 328   VM_ENTRY_MARK;
 329   return get_metadata(method)->as_method();
 330 }
 331 
 332 // ------------------------------------------------------------------
 333 // ciEnv::array_element_offset_in_bytes
 334 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {
 335   VM_ENTRY_MARK;
 336   objArrayOop a = (objArrayOop)a_h->get_oop();
 337   assert(a->is_objArray(), "");
 338   int length = a->length();
 339   oop o = o_h->get_oop();
 340   for (int i = 0; i < length; i++) {
 341     if (a->obj_at(i) == o)  return i;
 342   }
 343   return -1;
 344 }
 345 
 346 
 347 // ------------------------------------------------------------------
 348 // ciEnv::check_klass_accessiblity
 349 //
 350 // Note: the logic of this method should mirror the logic of
 351 // ConstantPool::verify_constant_pool_resolve.
 352 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
 353                                       Klass* resolved_klass) {
 354   if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
 355     return true;
 356   }
 357   if (accessing_klass->is_obj_array_klass()) {
 358     accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
 359   }
 360   if (!accessing_klass->is_instance_klass()) {
 361     return true;
 362   }
 363 
 364   if (resolved_klass->oop_is_objArray()) {
 365     // Find the element klass, if this is an array.
 366     resolved_klass = ObjArrayKlass::cast(resolved_klass)->bottom_klass();
 367   }
 368   if (resolved_klass->oop_is_instance()) {
 369     return Reflection::verify_class_access(accessing_klass->get_Klass(),
 370                                            resolved_klass,
 371                                            true);
 372   }
 373   return true;
 374 }
 375 
 376 // ------------------------------------------------------------------
 377 // ciEnv::get_klass_by_name_impl
 378 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
 379                                        constantPoolHandle cpool,
 380                                        ciSymbol* name,
 381                                        bool require_local) {
 382   ASSERT_IN_VM;
 383   EXCEPTION_CONTEXT;
 384 
 385   // Now we need to check the SystemDictionary
 386   Symbol* sym = name->get_symbol();
 387   if (sym->byte_at(0) == 'L' &&
 388     sym->byte_at(sym->utf8_length()-1) == ';') {
 389     // This is a name from a signature.  Strip off the trimmings.
 390     // Call recursive to keep scope of strippedsym.
 391     TempNewSymbol strippedsym = SymbolTable::new_symbol(sym->as_utf8()+1,
 392                     sym->utf8_length()-2,
 393                     KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
 394     ciSymbol* strippedname = get_symbol(strippedsym);
 395     return get_klass_by_name_impl(accessing_klass, cpool, strippedname, require_local);
 396   }
 397 
 398   // Check for prior unloaded klass.  The SystemDictionary's answers
 399   // can vary over time but the compiler needs consistency.
 400   ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
 401   if (unloaded_klass != NULL) {
 402     if (require_local)  return NULL;
 403     return unloaded_klass;
 404   }
 405 
 406   Handle loader(THREAD, (oop)NULL);
 407   Handle domain(THREAD, (oop)NULL);
 408   if (accessing_klass != NULL) {
 409     loader = Handle(THREAD, accessing_klass->loader());
 410     domain = Handle(THREAD, accessing_klass->protection_domain());
 411   }
 412 
 413   // setup up the proper type to return on OOM
 414   ciKlass* fail_type;
 415   if (sym->byte_at(0) == '[') {
 416     fail_type = _unloaded_ciobjarrayklass;
 417   } else {
 418     fail_type = _unloaded_ciinstance_klass;
 419   }
 420   KlassHandle found_klass;
 421   {
 422     ttyUnlocker ttyul;  // release tty lock to avoid ordering problems
 423     MutexLocker ml(Compile_lock);
 424     Klass* kls;
 425     if (!require_local) {
 426       kls = SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
 427                                                                        KILL_COMPILE_ON_FATAL_(fail_type));
 428     } else {
 429       kls = SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
 430                                                            KILL_COMPILE_ON_FATAL_(fail_type));
 431     }
 432     found_klass = KlassHandle(THREAD, kls);
 433   }
 434 
 435   // If we fail to find an array klass, look again for its element type.
 436   // The element type may be available either locally or via constraints.
 437   // In either case, if we can find the element type in the system dictionary,
 438   // we must build an array type around it.  The CI requires array klasses
 439   // to be loaded if their element klasses are loaded, except when memory
 440   // is exhausted.
 441   if (sym->byte_at(0) == '[' &&
 442       (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
 443     // We have an unloaded array.
 444     // Build it on the fly if the element class exists.
 445     TempNewSymbol elem_sym = SymbolTable::new_symbol(sym->as_utf8()+1,
 446                                                  sym->utf8_length()-1,
 447                                                  KILL_COMPILE_ON_FATAL_(fail_type));
 448 
 449     // Get element ciKlass recursively.
 450     ciKlass* elem_klass =
 451       get_klass_by_name_impl(accessing_klass,
 452                              cpool,
 453                              get_symbol(elem_sym),
 454                              require_local);
 455     if (elem_klass != NULL && elem_klass->is_loaded()) {
 456       // Now make an array for it
 457       return ciObjArrayKlass::make_impl(elem_klass);
 458     }
 459   }
 460 
 461   if (found_klass() == NULL && !cpool.is_null() && cpool->has_preresolution()) {
 462     // Look inside the constant pool for pre-resolved class entries.
 463     for (int i = cpool->length() - 1; i >= 1; i--) {
 464       if (cpool->tag_at(i).is_klass()) {
 465         Klass* kls = cpool->resolved_klass_at(i);
 466         if (kls->name() == sym) {
 467           found_klass = KlassHandle(THREAD, kls);
 468           break;
 469         }
 470       }
 471     }
 472   }
 473 
 474   if (found_klass() != NULL) {
 475     // Found it.  Build a CI handle.
 476     return get_klass(found_klass());
 477   }
 478 
 479   if (require_local)  return NULL;
 480 
 481   // Not yet loaded into the VM, or not governed by loader constraints.
 482   // Make a CI representative for it.
 483   return get_unloaded_klass(accessing_klass, name);
 484 }
 485 
 486 // ------------------------------------------------------------------
 487 // ciEnv::get_klass_by_name
 488 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
 489                                   ciSymbol* klass_name,
 490                                   bool require_local) {
 491   GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
 492                                                  constantPoolHandle(),
 493                                                  klass_name,
 494                                                  require_local);)
 495 }
 496 
 497 // ------------------------------------------------------------------
 498 // ciEnv::get_klass_by_index_impl
 499 //
 500 // Implementation of get_klass_by_index.
 501 ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool,
 502                                         int index,
 503                                         bool& is_accessible,
 504                                         ciInstanceKlass* accessor) {
 505   EXCEPTION_CONTEXT;
 506   KlassHandle klass; // = NULL;
 507   Symbol* klass_name = NULL;
 508 
 509   if (cpool->tag_at(index).is_symbol()) {
 510     klass_name = cpool->symbol_at(index);
 511   } else {
 512     // Check if it's resolved if it's not a symbol constant pool entry.
 513     klass = KlassHandle(THREAD, ConstantPool::klass_at_if_loaded(cpool, index));
 514 
 515   if (klass.is_null()) {
 516     // The klass has not been inserted into the constant pool.
 517     // Try to look it up by name.
 518     {
 519       // We have to lock the cpool to keep the oop from being resolved
 520       // while we are accessing it.
 521         MonitorLockerEx ml(cpool->lock());
 522       constantTag tag = cpool->tag_at(index);
 523       if (tag.is_klass()) {
 524         // The klass has been inserted into the constant pool
 525         // very recently.
 526         klass = KlassHandle(THREAD, cpool->resolved_klass_at(index));
 527       } else {
 528         assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");
 529         klass_name = cpool->unresolved_klass_at(index);
 530       }
 531     }
 532   }
 533   }
 534 
 535   if (klass.is_null()) {
 536     // Not found in constant pool.  Use the name to do the lookup.
 537     ciKlass* k = get_klass_by_name_impl(accessor,
 538                                         cpool,
 539                                         get_symbol(klass_name),
 540                                         false);
 541     // Calculate accessibility the hard way.
 542     if (!k->is_loaded()) {
 543       is_accessible = false;
 544     } else if (k->loader() != accessor->loader() &&
 545                get_klass_by_name_impl(accessor, cpool, k->name(), true) == NULL) {
 546       // Loaded only remotely.  Not linked yet.
 547       is_accessible = false;
 548     } else {
 549       // Linked locally, and we must also check public/private, etc.
 550       is_accessible = check_klass_accessibility(accessor, k->get_Klass());
 551     }
 552     return k;
 553   }
 554 
 555   // Check for prior unloaded klass.  The SystemDictionary's answers
 556   // can vary over time but the compiler needs consistency.
 557   ciSymbol* name = get_symbol(klass()->name());
 558   ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
 559   if (unloaded_klass != NULL) {
 560     is_accessible = false;
 561     return unloaded_klass;
 562   }
 563 
 564   // It is known to be accessible, since it was found in the constant pool.
 565   is_accessible = true;
 566   return get_klass(klass());
 567 }
 568 
 569 // ------------------------------------------------------------------
 570 // ciEnv::get_klass_by_index
 571 //
 572 // Get a klass from the constant pool.
 573 ciKlass* ciEnv::get_klass_by_index(constantPoolHandle cpool,
 574                                    int index,
 575                                    bool& is_accessible,
 576                                    ciInstanceKlass* accessor) {
 577   GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);)
 578 }
 579 
 580 // ------------------------------------------------------------------
 581 // ciEnv::get_constant_by_index_impl
 582 //
 583 // Implementation of get_constant_by_index().
 584 ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool,
 585                                              int pool_index, int cache_index,
 586                                              ciInstanceKlass* accessor) {
 587   bool ignore_will_link;
 588   EXCEPTION_CONTEXT;
 589   int index = pool_index;
 590   if (cache_index >= 0) {
 591     assert(index < 0, "only one kind of index at a time");
 592     oop obj = cpool->resolved_references()->obj_at(cache_index);
 593     if (obj != NULL) {
 594       ciObject* ciobj = get_object(obj);
 595       return ciConstant(T_OBJECT, ciobj);
 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     assert (constant->is_instance(), "must be an instance, or not? ");
 623     return ciConstant(T_OBJECT, constant);
 624   } else if (tag.is_klass() || tag.is_unresolved_klass()) {
 625     // 4881222: allow ldc to take a class type
 626     ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore_will_link, accessor);
 627     if (HAS_PENDING_EXCEPTION) {
 628       CLEAR_PENDING_EXCEPTION;
 629       record_out_of_memory_failure();
 630       return ciConstant();
 631     }
 632     assert (klass->is_instance_klass() || klass->is_array_klass(),
 633             "must be an instance or array klass ");
 634     return ciConstant(T_OBJECT, klass->java_mirror());
 635   } else if (tag.is_method_type()) {
 636     // must execute Java code to link this CP entry into cache[i].f1
 637     ciSymbol* signature = get_symbol(cpool->method_type_signature_at(index));
 638     ciObject* ciobj = get_unloaded_method_type_constant(signature);
 639     return ciConstant(T_OBJECT, ciobj);
 640   } else if (tag.is_method_handle()) {
 641     // must execute Java code to link this CP entry into cache[i].f1
 642     int ref_kind        = cpool->method_handle_ref_kind_at(index);
 643     int callee_index    = cpool->method_handle_klass_index_at(index);
 644     ciKlass* callee     = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor);
 645     ciSymbol* name      = get_symbol(cpool->method_handle_name_ref_at(index));
 646     ciSymbol* signature = get_symbol(cpool->method_handle_signature_ref_at(index));
 647     ciObject* ciobj     = get_unloaded_method_handle_constant(callee, name, signature, ref_kind);
 648     return ciConstant(T_OBJECT, ciobj);
 649   } else {
 650     ShouldNotReachHere();
 651     return ciConstant();
 652   }
 653 }
 654 
 655 // ------------------------------------------------------------------
 656 // ciEnv::get_constant_by_index
 657 //
 658 // Pull a constant out of the constant pool.  How appropriate.
 659 //
 660 // Implementation note: this query is currently in no way cached.
 661 ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool,
 662                                         int pool_index, int cache_index,
 663                                         ciInstanceKlass* accessor) {
 664   GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);)
 665 }
 666 
 667 // ------------------------------------------------------------------
 668 // ciEnv::get_field_by_index_impl
 669 //
 670 // Implementation of get_field_by_index.
 671 //
 672 // Implementation note: the results of field lookups are cached
 673 // in the accessor klass.
 674 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
 675                                         int index) {
 676   ciConstantPoolCache* cache = accessor->field_cache();
 677   if (cache == NULL) {
 678     ciField* field = new (arena()) ciField(accessor, index);
 679     return field;
 680   } else {
 681     ciField* field = (ciField*)cache->get(index);
 682     if (field == NULL) {
 683       field = new (arena()) ciField(accessor, index);
 684       cache->insert(index, field);
 685     }
 686     return field;
 687   }
 688 }
 689 
 690 // ------------------------------------------------------------------
 691 // ciEnv::get_field_by_index
 692 //
 693 // Get a field by index from a klass's constant pool.
 694 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
 695                                    int index) {
 696   GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
 697 }
 698 
 699 // ------------------------------------------------------------------
 700 // ciEnv::lookup_method
 701 //
 702 // Perform an appropriate method lookup based on accessor, holder,
 703 // name, signature, and bytecode.
 704 Method* ciEnv::lookup_method(InstanceKlass*  accessor,
 705                                InstanceKlass*  holder,
 706                                Symbol*       name,
 707                                Symbol*       sig,
 708                                Bytecodes::Code bc) {
 709   EXCEPTION_CONTEXT;
 710   KlassHandle h_accessor(THREAD, accessor);
 711   KlassHandle h_holder(THREAD, holder);
 712   LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
 713   methodHandle dest_method;
 714   switch (bc) {
 715   case Bytecodes::_invokestatic:
 716     dest_method =
 717       LinkResolver::resolve_static_call_or_null(h_holder, name, sig, h_accessor);
 718     break;
 719   case Bytecodes::_invokespecial:
 720     dest_method =
 721       LinkResolver::resolve_special_call_or_null(h_holder, name, sig, h_accessor);
 722     break;
 723   case Bytecodes::_invokeinterface:
 724     dest_method =
 725       LinkResolver::linktime_resolve_interface_method_or_null(h_holder, name, sig,
 726                                                               h_accessor, true);
 727     break;
 728   case Bytecodes::_invokevirtual:
 729     dest_method =
 730       LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, name, sig,
 731                                                             h_accessor, true);
 732     break;
 733   default: ShouldNotReachHere();
 734   }
 735 
 736   return dest_method();
 737 }
 738 
 739 
 740 // ------------------------------------------------------------------
 741 // ciEnv::get_method_by_index_impl
 742 ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool,
 743                                           int index, Bytecodes::Code bc,
 744                                           ciInstanceKlass* accessor) {
 745   if (bc == Bytecodes::_invokedynamic) {
 746     ConstantPoolCacheEntry* cpce = cpool->invokedynamic_cp_cache_entry_at(index);
 747     bool is_resolved = !cpce->is_f1_null();
 748     // FIXME: code generation could allow for null (unlinked) call site
 749     // The call site could be made patchable as follows:
 750     // Load the appendix argument from the constant pool.
 751     // Test the appendix argument and jump to a known deopt routine if it is null.
 752     // Jump through a patchable call site, which is initially a deopt routine.
 753     // Patch the call site to the nmethod entry point of the static compiled lambda form.
 754     // As with other two-component call sites, both values must be independently verified.
 755 
 756     if (is_resolved) {
 757       // Get the invoker Method* from the constant pool.
 758       // (The appendix argument, if any, will be noted in the method's signature.)
 759       Method* adapter = cpce->f1_as_method();
 760       return get_method(adapter);
 761     }
 762 
 763     // Fake a method that is equivalent to a declared method.
 764     ciInstanceKlass* holder    = get_instance_klass(SystemDictionary::MethodHandle_klass());
 765     ciSymbol*        name      = ciSymbol::invokeBasic_name();
 766     ciSymbol*        signature = get_symbol(cpool->signature_ref_at(index));
 767     return get_unloaded_method(holder, name, signature, accessor);
 768   } else {
 769     const int holder_index = cpool->klass_ref_index_at(index);
 770     bool holder_is_accessible;
 771     ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
 772     ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
 773 
 774     // Get the method's name and signature.
 775     Symbol* name_sym = cpool->name_ref_at(index);
 776     Symbol* sig_sym  = cpool->signature_ref_at(index);
 777 
 778     if (cpool->has_preresolution()
 779         || (holder == ciEnv::MethodHandle_klass() &&
 780             MethodHandles::is_signature_polymorphic_name(holder->get_Klass(), name_sym))) {
 781       // Short-circuit lookups for JSR 292-related call sites.
 782       // That is, do not rely only on name-based lookups, because they may fail
 783       // if the names are not resolvable in the boot class loader (7056328).
 784       switch (bc) {
 785       case Bytecodes::_invokevirtual:
 786       case Bytecodes::_invokeinterface:
 787       case Bytecodes::_invokespecial:
 788       case Bytecodes::_invokestatic:
 789         {
 790           Method* m = ConstantPool::method_at_if_loaded(cpool, index);
 791           if (m != NULL) {
 792             return get_method(m);
 793           }
 794         }
 795         break;
 796       }
 797     }
 798 
 799     if (holder_is_accessible) {  // Our declared holder is loaded.
 800       InstanceKlass* lookup = declared_holder->get_instanceKlass();
 801       Method* m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
 802       if (m != NULL &&
 803           (bc == Bytecodes::_invokestatic
 804            ?  m->method_holder()->is_not_initialized()
 805            : !m->method_holder()->is_loaded())) {
 806         m = NULL;
 807       }
 808 #ifdef ASSERT
 809       if (m != NULL && ReplayCompiles && !ciReplay::is_loaded(m)) {
 810         m = NULL;
 811       }
 812 #endif
 813       if (m != NULL) {
 814         // We found the method.
 815         return get_method(m);
 816       }
 817     }
 818 
 819     // Either the declared holder was not loaded, or the method could
 820     // not be found.  Create a dummy ciMethod to represent the failed
 821     // lookup.
 822     ciSymbol* name      = get_symbol(name_sym);
 823     ciSymbol* signature = get_symbol(sig_sym);
 824     return get_unloaded_method(declared_holder, name, signature, accessor);
 825   }
 826 }
 827 
 828 
 829 // ------------------------------------------------------------------
 830 // ciEnv::get_instance_klass_for_declared_method_holder
 831 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
 832   // For the case of <array>.clone(), the method holder can be a ciArrayKlass
 833   // instead of a ciInstanceKlass.  For that case simply pretend that the
 834   // declared holder is Object.clone since that's where the call will bottom out.
 835   // A more correct fix would trickle out through many interfaces in CI,
 836   // requiring ciInstanceKlass* to become ciKlass* and many more places would
 837   // require checks to make sure the expected type was found.  Given that this
 838   // only occurs for clone() the more extensive fix seems like overkill so
 839   // instead we simply smear the array type into Object.
 840   guarantee(method_holder != NULL, "no method holder");
 841   if (method_holder->is_instance_klass()) {
 842     return method_holder->as_instance_klass();
 843   } else if (method_holder->is_array_klass()) {
 844     return current()->Object_klass();
 845   } else {
 846     ShouldNotReachHere();
 847   }
 848   return NULL;
 849 }
 850 
 851 
 852 // ------------------------------------------------------------------
 853 // ciEnv::get_method_by_index
 854 ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool,
 855                                      int index, Bytecodes::Code bc,
 856                                      ciInstanceKlass* accessor) {
 857   GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);)
 858 }
 859 
 860 
 861 // ------------------------------------------------------------------
 862 // ciEnv::name_buffer
 863 char *ciEnv::name_buffer(int req_len) {
 864   if (_name_buffer_len < req_len) {
 865     if (_name_buffer == NULL) {
 866       _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
 867       _name_buffer_len = req_len;
 868     } else {
 869       _name_buffer =
 870         (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
 871       _name_buffer_len = req_len;
 872     }
 873   }
 874   return _name_buffer;
 875 }
 876 
 877 // ------------------------------------------------------------------
 878 // ciEnv::is_in_vm
 879 bool ciEnv::is_in_vm() {
 880   return JavaThread::current()->thread_state() == _thread_in_vm;
 881 }
 882 
 883 bool ciEnv::system_dictionary_modification_counter_changed() {
 884   return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
 885 }
 886 
 887 // ------------------------------------------------------------------
 888 // ciEnv::validate_compile_task_dependencies
 889 //
 890 // Check for changes during compilation (e.g. class loads, evolution,
 891 // breakpoints, call site invalidation).
 892 void ciEnv::validate_compile_task_dependencies(ciMethod* target) {
 893   if (failing())  return;  // no need for further checks
 894 
 895   // First, check non-klass dependencies as we might return early and
 896   // not check klass dependencies if the system dictionary
 897   // modification counter hasn't changed (see below).
 898   for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
 899     if (deps.is_klass_type())  continue;  // skip klass dependencies
 900     Klass* witness = deps.check_dependency();
 901     if (witness != NULL) {
 902       record_failure("invalid non-klass dependency");
 903       return;
 904     }
 905   }
 906 
 907   // Klass dependencies must be checked when the system dictionary
 908   // changes.  If logging is enabled all violated dependences will be
 909   // recorded in the log.  In debug mode check dependencies even if
 910   // the system dictionary hasn't changed to verify that no invalid
 911   // dependencies were inserted.  Any violated dependences in this
 912   // case are dumped to the tty.
 913   bool counter_changed = system_dictionary_modification_counter_changed();
 914 
 915   bool verify_deps = trueInDebug;
 916   if (!counter_changed && !verify_deps)  return;
 917 
 918   int klass_violations = 0;
 919   for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
 920     if (!deps.is_klass_type())  continue;  // skip non-klass dependencies
 921     Klass* witness = deps.check_dependency();
 922     if (witness != NULL) {
 923       klass_violations++;
 924       if (!counter_changed) {
 925         // Dependence failed but counter didn't change.  Log a message
 926         // describing what failed and allow the assert at the end to
 927         // trigger.
 928         deps.print_dependency(witness);
 929       } else if (xtty == NULL) {
 930         // If we're not logging then a single violation is sufficient,
 931         // otherwise we want to log all the dependences which were
 932         // violated.
 933         break;
 934       }
 935     }
 936   }
 937 
 938   if (klass_violations != 0) {
 939 #ifdef ASSERT
 940     if (!counter_changed && !PrintCompilation) {
 941       // Print out the compile task that failed
 942       _task->print_line();
 943     }
 944 #endif
 945     assert(counter_changed, "failed dependencies, but counter didn't change");
 946     record_failure("concurrent class loading");
 947   }
 948 }
 949 
 950 // ------------------------------------------------------------------
 951 // ciEnv::register_method
 952 void ciEnv::register_method(ciMethod* target,
 953                             int entry_bci,
 954                             CodeOffsets* offsets,
 955                             int orig_pc_offset,
 956                             CodeBuffer* code_buffer,
 957                             int frame_words,
 958                             OopMapSet* oop_map_set,
 959                             ExceptionHandlerTable* handler_table,
 960                             ImplicitExceptionTable* inc_table,
 961                             AbstractCompiler* compiler,
 962                             int comp_level,
 963                             bool has_unsafe_access,
 964                             bool has_wide_vectors,
 965                             RTMState  rtm_state) {
 966   VM_ENTRY_MARK;
 967   nmethod* nm = NULL;
 968   {
 969     // To prevent compile queue updates.
 970     MutexLocker locker(MethodCompileQueue_lock, THREAD);
 971 
 972     // Prevent SystemDictionary::add_to_hierarchy from running
 973     // and invalidating our dependencies until we install this method.
 974     // No safepoints are allowed. Otherwise, class redefinition can occur in between.
 975     MutexLocker ml(Compile_lock);
 976     No_Safepoint_Verifier nsv;
 977 
 978     // Change in Jvmti state may invalidate compilation.
 979     if (!failing() && jvmti_state_changed()) {
 980       record_failure("Jvmti state change invalidated dependencies");
 981     }
 982 
 983     // Change in DTrace flags may invalidate compilation.
 984     if (!failing() &&
 985         ( (!dtrace_extended_probes() && ExtendedDTraceProbes) ||
 986           (!dtrace_method_probes() && DTraceMethodProbes) ||
 987           (!dtrace_alloc_probes() && DTraceAllocProbes) )) {
 988       record_failure("DTrace flags change invalidated dependencies");
 989     }
 990 
 991     if (!failing()) {
 992       if (log() != NULL) {
 993         // Log the dependencies which this compilation declares.
 994         dependencies()->log_all_dependencies();
 995       }
 996 
 997       // Encode the dependencies now, so we can check them right away.
 998       dependencies()->encode_content_bytes();
 999 
1000       // Check for {class loads, evolution, breakpoints, ...} during compilation
1001       validate_compile_task_dependencies(target);
1002     }
1003 
1004     methodHandle method(THREAD, target->get_Method());
1005 
1006 #if INCLUDE_RTM_OPT
1007     if (!failing() && (rtm_state != NoRTM) &&
1008         (method()->method_data() != NULL) &&
1009         (method()->method_data()->rtm_state() != rtm_state)) {
1010       // Preemptive decompile if rtm state was changed.
1011       record_failure("RTM state change invalidated rtm code");
1012     }
1013 #endif
1014 
1015     if (failing()) {
1016       // While not a true deoptimization, it is a preemptive decompile.
1017       MethodData* mdo = method()->method_data();
1018       if (mdo != NULL) {
1019         mdo->inc_decompile_count();
1020       }
1021 
1022       // All buffers in the CodeBuffer are allocated in the CodeCache.
1023       // If the code buffer is created on each compile attempt
1024       // as in C2, then it must be freed.
1025       code_buffer->free_blob();
1026       return;
1027     }
1028 
1029     assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
1030     assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
1031 
1032     nm =  nmethod::new_nmethod(method,
1033                                compile_id(),
1034                                entry_bci,
1035                                offsets,
1036                                orig_pc_offset,
1037                                debug_info(), dependencies(), code_buffer,
1038                                frame_words, oop_map_set,
1039                                handler_table, inc_table,
1040                                compiler, comp_level);
1041     // Free codeBlobs
1042     code_buffer->free_blob();
1043 
1044     if (nm != NULL) {
1045       nm->set_has_unsafe_access(has_unsafe_access);
1046       nm->set_has_wide_vectors(has_wide_vectors);
1047 #if INCLUDE_RTM_OPT
1048       nm->set_rtm_state(rtm_state);
1049 #endif
1050 
1051       // Record successful registration.
1052       // (Put nm into the task handle *before* publishing to the Java heap.)
1053       if (task() != NULL) {
1054         task()->set_code(nm);
1055       }
1056 
1057       if (entry_bci == InvocationEntryBci) {
1058         if (TieredCompilation) {
1059           // If there is an old version we're done with it
1060           nmethod* old = method->code();
1061           if (TraceMethodReplacement && old != NULL) {
1062             ResourceMark rm;
1063             char *method_name = method->name_and_sig_as_C_string();
1064             tty->print_cr("Replacing method %s", method_name);
1065           }
1066           if (old != NULL) {
1067             old->make_not_entrant();
1068           }
1069         }
1070         if (TraceNMethodInstalls) {
1071           ResourceMark rm;
1072           char *method_name = method->name_and_sig_as_C_string();
1073           ttyLocker ttyl;
1074           tty->print_cr("Installing method (%d) %s ",
1075                         comp_level,
1076                         method_name);
1077         }
1078         // Allow the code to be executed
1079         method->set_code(method, nm);
1080       } else {
1081         if (TraceNMethodInstalls) {
1082           ResourceMark rm;
1083           char *method_name = method->name_and_sig_as_C_string();
1084           ttyLocker ttyl;
1085           tty->print_cr("Installing osr method (%d) %s @ %d",
1086                         comp_level,
1087                         method_name,
1088                         entry_bci);
1089         }
1090         method->method_holder()->add_osr_nmethod(nm);
1091       }
1092     }
1093   }  // safepoints are allowed again
1094 
1095   if (nm != NULL) {
1096     // JVMTI -- compiled method notification (must be done outside lock)
1097     nm->post_compiled_method_load_event();
1098   } else {
1099     // The CodeCache is full. Print out warning and disable compilation.
1100     record_failure("code cache is full");
1101     CompileBroker::handle_full_code_cache(CodeCache::get_code_blob_type(comp_level));
1102   }
1103 }
1104 
1105 
1106 // ------------------------------------------------------------------
1107 // ciEnv::find_system_klass
1108 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
1109   VM_ENTRY_MARK;
1110   return get_klass_by_name_impl(NULL, constantPoolHandle(), klass_name, false);
1111 }
1112 
1113 // ------------------------------------------------------------------
1114 // ciEnv::comp_level
1115 int ciEnv::comp_level() {
1116   if (task() == NULL)  return CompLevel_highest_tier;
1117   return task()->comp_level();
1118 }
1119 
1120 // ------------------------------------------------------------------
1121 // ciEnv::compile_id
1122 uint ciEnv::compile_id() {
1123   if (task() == NULL)  return 0;
1124   return task()->compile_id();
1125 }
1126 
1127 // ------------------------------------------------------------------
1128 // ciEnv::notice_inlined_method()
1129 void ciEnv::notice_inlined_method(ciMethod* method) {
1130   _num_inlined_bytecodes += method->code_size_for_inlining();
1131 }
1132 
1133 // ------------------------------------------------------------------
1134 // ciEnv::num_inlined_bytecodes()
1135 int ciEnv::num_inlined_bytecodes() const {
1136   return _num_inlined_bytecodes;
1137 }
1138 
1139 // ------------------------------------------------------------------
1140 // ciEnv::record_failure()
1141 void ciEnv::record_failure(const char* reason) {
1142   if (log() != NULL) {
1143     log()->elem("failure reason='%s'", reason);
1144   }
1145   if (_failure_reason == NULL) {
1146     // Record the first failure reason.
1147     _failure_reason = reason;
1148   }
1149 }
1150 
1151 // ------------------------------------------------------------------
1152 // ciEnv::record_method_not_compilable()
1153 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
1154   int new_compilable =
1155     all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
1156 
1157   // Only note transitions to a worse state
1158   if (new_compilable > _compilable) {
1159     if (log() != NULL) {
1160       if (all_tiers) {
1161         log()->elem("method_not_compilable");
1162       } else {
1163         log()->elem("method_not_compilable_at_tier level='%d'",
1164                     current()->task()->comp_level());
1165       }
1166     }
1167     _compilable = new_compilable;
1168 
1169     // Reset failure reason; this one is more important.
1170     _failure_reason = NULL;
1171     record_failure(reason);
1172   }
1173 }
1174 
1175 // ------------------------------------------------------------------
1176 // ciEnv::record_out_of_memory_failure()
1177 void ciEnv::record_out_of_memory_failure() {
1178   // If memory is low, we stop compiling methods.
1179   record_method_not_compilable("out of memory");
1180 }
1181 
1182 ciInstance* ciEnv::unloaded_ciinstance() {
1183   GUARDED_VM_ENTRY(return _factory->get_unloaded_object_constant();)
1184 }
1185 
1186 // ------------------------------------------------------------------
1187 // ciEnv::dump_replay_data*
1188 
1189 // Don't change thread state and acquire any locks.
1190 // Safe to call from VM error reporter.
1191 
1192 void ciEnv::dump_compile_data(outputStream* out) {
1193   CompileTask* task = this->task();
1194   Method* method = task->method();
1195   int entry_bci = task->osr_bci();
1196   int comp_level = task->comp_level();
1197   out->print("compile %s %s %s %d %d",
1198                 method->klass_name()->as_quoted_ascii(),
1199                 method->name()->as_quoted_ascii(),
1200                 method->signature()->as_quoted_ascii(),
1201                 entry_bci, comp_level);
1202   if (compiler_data() != NULL) {
1203     if (is_c2_compile(comp_level)) { // C2 or Shark
1204 #ifdef COMPILER2
1205       // Dump C2 inlining data.
1206       ((Compile*)compiler_data())->dump_inline_data(out);
1207 #endif
1208     } else if (is_c1_compile(comp_level)) { // C1
1209 #ifdef COMPILER1
1210       // Dump C1 inlining data.
1211       ((Compilation*)compiler_data())->dump_inline_data(out);
1212 #endif
1213     }
1214   }
1215   out->cr();
1216 }
1217 
1218 void ciEnv::dump_replay_data_unsafe(outputStream* out) {
1219   ResourceMark rm;
1220 #if INCLUDE_JVMTI
1221   out->print_cr("JvmtiExport can_access_local_variables %d",     _jvmti_can_access_local_variables);
1222   out->print_cr("JvmtiExport can_hotswap_or_post_breakpoint %d", _jvmti_can_hotswap_or_post_breakpoint);
1223   out->print_cr("JvmtiExport can_post_on_exceptions %d",         _jvmti_can_post_on_exceptions);
1224 #endif // INCLUDE_JVMTI
1225 
1226   GrowableArray<ciMetadata*>* objects = _factory->get_ci_metadata();
1227   out->print_cr("# %d ciObject found", objects->length());
1228   for (int i = 0; i < objects->length(); i++) {
1229     objects->at(i)->dump_replay_data(out);
1230   }
1231   dump_compile_data(out);
1232   out->flush();
1233 }
1234 
1235 void ciEnv::dump_replay_data(outputStream* out) {
1236   GUARDED_VM_ENTRY(
1237     MutexLocker ml(Compile_lock);
1238     dump_replay_data_unsafe(out);
1239   )
1240 }
1241 
1242 void ciEnv::dump_replay_data(int compile_id) {
1243   static char buffer[O_BUFLEN];
1244   int ret = jio_snprintf(buffer, O_BUFLEN, "replay_pid%p_compid%d.log", os::current_process_id(), compile_id);
1245   if (ret > 0) {
1246     int fd = open(buffer, O_RDWR | O_CREAT | O_TRUNC, 0666);
1247     if (fd != -1) {
1248       FILE* replay_data_file = os::open(fd, "w");
1249       if (replay_data_file != NULL) {
1250         fileStream replay_data_stream(replay_data_file, /*need_close=*/true);
1251         dump_replay_data(&replay_data_stream);
1252         tty->print("# Compiler replay data is saved as: ");
1253         tty->print_cr(buffer);
1254       } else {
1255         tty->print_cr("# Can't open file to dump replay data.");
1256       }
1257     }
1258   }
1259 }
1260 
1261 void ciEnv::dump_inline_data(int compile_id) {
1262   static char buffer[O_BUFLEN];
1263   int ret = jio_snprintf(buffer, O_BUFLEN, "inline_pid%p_compid%d.log", os::current_process_id(), compile_id);
1264   if (ret > 0) {
1265     int fd = open(buffer, O_RDWR | O_CREAT | O_TRUNC, 0666);
1266     if (fd != -1) {
1267       FILE* inline_data_file = os::open(fd, "w");
1268       if (inline_data_file != NULL) {
1269         fileStream replay_data_stream(inline_data_file, /*need_close=*/true);
1270         GUARDED_VM_ENTRY(
1271           MutexLocker ml(Compile_lock);
1272           dump_compile_data(&replay_data_stream);
1273         )
1274         replay_data_stream.flush();
1275         tty->print("# Compiler inline data is saved as: ");
1276         tty->print_cr(buffer);
1277       } else {
1278         tty->print_cr("# Can't open file to dump inline data.");
1279       }
1280     }
1281   }
1282 }