1 /*

     2  * Copyright 1999-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_ciEnv.cpp.incl"

    27 

    28 // ciEnv

    29 //

    30 // This class is the top level broker for requests from the compiler

    31 // to the VM.

    32 

    33 ciObject*              ciEnv::_null_object_instance;

    34 ciMethodKlass*         ciEnv::_method_klass_instance;

    35 ciSymbolKlass*         ciEnv::_symbol_klass_instance;

    36 ciKlassKlass*          ciEnv::_klass_klass_instance;

    37 ciInstanceKlassKlass*  ciEnv::_instance_klass_klass_instance;

    38 ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance;

    39 ciObjArrayKlassKlass*  ciEnv::_obj_array_klass_klass_instance;

    40 

    41 ciInstanceKlass* ciEnv::_ArrayStoreException;

    42 ciInstanceKlass* ciEnv::_Class;

    43 ciInstanceKlass* ciEnv::_ClassCastException;

    44 ciInstanceKlass* ciEnv::_Object;

    45 ciInstanceKlass* ciEnv::_Throwable;

    46 ciInstanceKlass* ciEnv::_Thread;

    47 ciInstanceKlass* ciEnv::_OutOfMemoryError;

    48 ciInstanceKlass* ciEnv::_String;

    49 

    50 ciSymbol*        ciEnv::_unloaded_cisymbol = NULL;

    51 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;

    52 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;

    53 

    54 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;

    55 jobject ciEnv::_ArrayStoreException_handle = NULL;

    56 jobject ciEnv::_ClassCastException_handle = NULL;

    57 

    58 #ifndef PRODUCT

    59 static bool firstEnv = true;

    60 #endif /* PRODUCT */

    61 

    62 // ------------------------------------------------------------------

    63 // ciEnv::ciEnv

    64 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {

    65   VM_ENTRY_MARK;

    66 

    67   // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.

    68   thread->set_env(this);

    69   assert(ciEnv::current() == this, "sanity");

    70 

    71   _oop_recorder = NULL;

    72   _debug_info = NULL;

    73   _dependencies = NULL;

    74   _failure_reason = NULL;

    75   _compilable = MethodCompilable;

    76   _break_at_compile = false;

    77   _compiler_data = NULL;

    78 #ifndef PRODUCT

    79   assert(!firstEnv, "not initialized properly");

    80 #endif /* !PRODUCT */

    81 

    82   _system_dictionary_modification_counter = system_dictionary_modification_counter;

    83   _num_inlined_bytecodes = 0;

    84   assert(task == NULL || thread->task() == task, "sanity");

    85   _task = task;

    86   _log = NULL;

    87 

    88   // Temporary buffer for creating symbols and such.

    89   _name_buffer = NULL;

    90   _name_buffer_len = 0;

    91 

    92   _arena   = &_ciEnv_arena;

    93   _factory = new (_arena) ciObjectFactory(_arena, 128);

    94 

    95   // Preload commonly referenced system ciObjects.

    96 

    97   // During VM initialization, these instances have not yet been created.

    98   // Assertions ensure that these instances are not accessed before

    99   // their initialization.

   100 

   101   assert(Universe::is_fully_initialized(), "should be complete");

   102 

   103   oop o = Universe::null_ptr_exception_instance();

   104   assert(o != NULL, "should have been initialized");

   105   _NullPointerException_instance = get_object(o)->as_instance();

   106   o = Universe::arithmetic_exception_instance();

   107   assert(o != NULL, "should have been initialized");

   108   _ArithmeticException_instance = get_object(o)->as_instance();

   109 

   110   _ArrayIndexOutOfBoundsException_instance = NULL;

   111   _ArrayStoreException_instance = NULL;

   112   _ClassCastException_instance = NULL;

   113 }

   114 

   115 ciEnv::ciEnv(Arena* arena) {

   116   ASSERT_IN_VM;

   117 

   118   // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.

   119   CompilerThread* current_thread = CompilerThread::current();

   120   assert(current_thread->env() == NULL, "must be");

   121   current_thread->set_env(this);

   122   assert(ciEnv::current() == this, "sanity");

   123 

   124   _oop_recorder = NULL;

   125   _debug_info = NULL;

   126   _dependencies = NULL;

   127   _failure_reason = NULL;

   128   _compilable = MethodCompilable_never;

   129   _break_at_compile = false;

   130   _compiler_data = NULL;

   131 #ifndef PRODUCT

   132   assert(firstEnv, "must be first");

   133   firstEnv = false;

   134 #endif /* !PRODUCT */

   135 

   136   _system_dictionary_modification_counter = 0;

   137   _num_inlined_bytecodes = 0;

   138   _task = NULL;

   139   _log = NULL;

   140 

   141   // Temporary buffer for creating symbols and such.

   142   _name_buffer = NULL;

   143   _name_buffer_len = 0;

   144 

   145   _arena   = arena;

   146   _factory = new (_arena) ciObjectFactory(_arena, 128);

   147 

   148   // Preload commonly referenced system ciObjects.

   149 

   150   // During VM initialization, these instances have not yet been created.

   151   // Assertions ensure that these instances are not accessed before

   152   // their initialization.

   153 

   154   assert(Universe::is_fully_initialized(), "must be");

   155 

   156   oop o = Universe::null_ptr_exception_instance();

   157   assert(o != NULL, "should have been initialized");

   158   _NullPointerException_instance = get_object(o)->as_instance();

   159   o = Universe::arithmetic_exception_instance();

   160   assert(o != NULL, "should have been initialized");

   161   _ArithmeticException_instance = get_object(o)->as_instance();

   162 

   163   _ArrayIndexOutOfBoundsException_instance = NULL;

   164   _ArrayStoreException_instance = NULL;

   165   _ClassCastException_instance = NULL;

   166 }

   167 

   168 ciEnv::~ciEnv() {

   169   CompilerThread* current_thread = CompilerThread::current();

   170   current_thread->set_env(NULL);

   171 }

   172 

   173 // ------------------------------------------------------------------

   174 // helper for lazy exception creation

   175 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) {

   176   VM_ENTRY_MARK;

   177   if (handle == NULL) {

   178     // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.

   179     klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD);

   180     jobject objh = NULL;

   181     if (!HAS_PENDING_EXCEPTION && k != NULL) {

   182       oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD);

   183       if (!HAS_PENDING_EXCEPTION)

   184         objh = JNIHandles::make_global(obj);

   185     }

   186     if (HAS_PENDING_EXCEPTION) {

   187       CLEAR_PENDING_EXCEPTION;

   188     } else {

   189       handle = objh;

   190     }

   191   }

   192   oop obj = JNIHandles::resolve(handle);

   193   return obj == NULL? NULL: get_object(obj)->as_instance();

   194 }

   195 

   196 // ------------------------------------------------------------------

   197 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc.

   198 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {

   199   if (_ArrayIndexOutOfBoundsException_instance == NULL) {

   200     _ArrayIndexOutOfBoundsException_instance

   201           = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,

   202           vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException());

   203   }

   204   return _ArrayIndexOutOfBoundsException_instance;

   205 }

   206 ciInstance* ciEnv::ArrayStoreException_instance() {

   207   if (_ArrayStoreException_instance == NULL) {

   208     _ArrayStoreException_instance

   209           = get_or_create_exception(_ArrayStoreException_handle,

   210           vmSymbolHandles::java_lang_ArrayStoreException());

   211   }

   212   return _ArrayStoreException_instance;

   213 }

   214 ciInstance* ciEnv::ClassCastException_instance() {

   215   if (_ClassCastException_instance == NULL) {

   216     _ClassCastException_instance

   217           = get_or_create_exception(_ClassCastException_handle,

   218           vmSymbolHandles::java_lang_ClassCastException());

   219   }

   220   return _ClassCastException_instance;

   221 }

   222 

   223 // ------------------------------------------------------------------

   224 // ciEnv::get_method_from_handle

   225 ciMethod* ciEnv::get_method_from_handle(jobject method) {

   226   VM_ENTRY_MARK;

   227   return get_object(JNIHandles::resolve(method))->as_method();

   228 }

   229 

   230 // ------------------------------------------------------------------

   231 // ciEnv::make_array

   232 ciArray* ciEnv::make_array(GrowableArray<ciObject*>* objects) {

   233   VM_ENTRY_MARK;

   234   int length = objects->length();

   235   objArrayOop a = oopFactory::new_system_objArray(length, THREAD);

   236   if (HAS_PENDING_EXCEPTION) {

   237     CLEAR_PENDING_EXCEPTION;

   238     record_out_of_memory_failure();

   239     return NULL;

   240   }

   241   for (int i = 0; i < length; i++) {

   242     a->obj_at_put(i, objects->at(i)->get_oop());

   243   }

   244   assert(a->is_perm(), "");

   245   return get_object(a)->as_array();

   246 }

   247 

   248 

   249 // ------------------------------------------------------------------

   250 // ciEnv::array_element_offset_in_bytes

   251 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {

   252   VM_ENTRY_MARK;

   253   objArrayOop a = (objArrayOop)a_h->get_oop();

   254   assert(a->is_objArray(), "");

   255   int length = a->length();

   256   oop o = o_h->get_oop();

   257   for (int i = 0; i < length; i++) {

   258     if (a->obj_at(i) == o)  return i;

   259   }

   260   return -1;

   261 }

   262 

   263 

   264 // ------------------------------------------------------------------

   265 // ciEnv::check_klass_accessiblity

   266 //

   267 // Note: the logic of this method should mirror the logic of

   268 // constantPoolOopDesc::verify_constant_pool_resolve.

   269 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,

   270                                       klassOop resolved_klass) {

   271   if (accessing_klass == NULL || !accessing_klass->is_loaded()) {

   272     return true;

   273   }

   274   if (accessing_klass->is_obj_array()) {

   275     accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();

   276   }

   277   if (!accessing_klass->is_instance_klass()) {

   278     return true;

   279   }

   280 

   281   if (resolved_klass->klass_part()->oop_is_objArray()) {

   282     // Find the element klass, if this is an array.

   283     resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass();

   284   }

   285   if (resolved_klass->klass_part()->oop_is_instance()) {

   286     return Reflection::verify_class_access(accessing_klass->get_klassOop(),

   287                                            resolved_klass,

   288                                            true);

   289   }

   290   return true;

   291 }

   292 

   293 // ------------------------------------------------------------------

   294 // ciEnv::get_klass_by_name_impl

   295 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,

   296                                        ciSymbol* name,

   297                                        bool require_local) {

   298   ASSERT_IN_VM;

   299   EXCEPTION_CONTEXT;

   300 

   301   // Now we need to check the SystemDictionary

   302   symbolHandle sym(THREAD, name->get_symbolOop());

   303   if (sym->byte_at(0) == 'L' &&

   304     sym->byte_at(sym->utf8_length()-1) == ';') {

   305     // This is a name from a signature.  Strip off the trimmings.

   306     sym = oopFactory::new_symbol_handle(sym->as_utf8()+1,

   307                                         sym->utf8_length()-2,

   308                                         KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));

   309     name = get_object(sym())->as_symbol();

   310   }

   311 

   312   // Check for prior unloaded klass.  The SystemDictionary's answers

   313   // can vary over time but the compiler needs consistency.

   314   ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);

   315   if (unloaded_klass != NULL) {

   316     if (require_local)  return NULL;

   317     return unloaded_klass;

   318   }

   319 

   320   Handle loader(THREAD, (oop)NULL);

   321   Handle domain(THREAD, (oop)NULL);

   322   if (accessing_klass != NULL) {

   323     loader = Handle(THREAD, accessing_klass->loader());

   324     domain = Handle(THREAD, accessing_klass->protection_domain());

   325   }

   326 

   327   // setup up the proper type to return on OOM

   328   ciKlass* fail_type;

   329   if (sym->byte_at(0) == '[') {

   330     fail_type = _unloaded_ciobjarrayklass;

   331   } else {

   332     fail_type = _unloaded_ciinstance_klass;

   333   }

   334   klassOop found_klass;

   335   if (!require_local) {

   336     found_klass =

   337       SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,

   338                                                                  KILL_COMPILE_ON_FATAL_(fail_type));

   339   } else {

   340     found_klass =

   341       SystemDictionary::find_instance_or_array_klass(sym, loader, domain,

   342                                                      KILL_COMPILE_ON_FATAL_(fail_type));

   343   }

   344 

   345   if (found_klass != NULL) {

   346     // Found it.  Build a CI handle.

   347     return get_object(found_klass)->as_klass();

   348   }

   349 

   350   // If we fail to find an array klass, look again for its element type.

   351   // The element type may be available either locally or via constraints.

   352   // In either case, if we can find the element type in the system dictionary,

   353   // we must build an array type around it.  The CI requires array klasses

   354   // to be loaded if their element klasses are loaded, except when memory

   355   // is exhausted.

   356   if (sym->byte_at(0) == '[' &&

   357       (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {

   358     // We have an unloaded array.

   359     // Build it on the fly if the element class exists.

   360     symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1,

   361                                                 sym->utf8_length()-1,

   362                                                 KILL_COMPILE_ON_FATAL_(fail_type));

   363     // Get element ciKlass recursively.

   364     ciKlass* elem_klass =

   365       get_klass_by_name_impl(accessing_klass,

   366                              get_object(elem_sym)->as_symbol(),

   367                              require_local);

   368     if (elem_klass != NULL && elem_klass->is_loaded()) {

   369       // Now make an array for it

   370       return ciObjArrayKlass::make_impl(elem_klass);

   371     }

   372   }

   373 

   374   if (require_local)  return NULL;

   375   // Not yet loaded into the VM, or not governed by loader constraints.

   376   // Make a CI representative for it.

   377   return get_unloaded_klass(accessing_klass, name);

   378 }

   379 

   380 // ------------------------------------------------------------------

   381 // ciEnv::get_klass_by_name

   382 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,

   383                                   ciSymbol* klass_name,

   384                                   bool require_local) {

   385   GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,

   386                                                  klass_name,

   387                                                  require_local);)

   388 }

   389 

   390 // ------------------------------------------------------------------

   391 // ciEnv::get_klass_by_index_impl

   392 //

   393 // Implementation of get_klass_by_index.

   394 ciKlass* ciEnv::get_klass_by_index_impl(ciInstanceKlass* accessor,

   395                                         int index,

   396                                         bool& is_accessible) {

   397   assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");

   398   EXCEPTION_CONTEXT;

   399   constantPoolHandle cpool(THREAD, accessor->get_instanceKlass()->constants());

   400   KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index));

   401   symbolHandle klass_name;

   402   if (klass.is_null()) {

   403     // The klass has not been inserted into the constant pool.

   404     // Try to look it up by name.

   405     {

   406       // We have to lock the cpool to keep the oop from being resolved

   407       // while we are accessing it.

   408       ObjectLocker ol(cpool, THREAD);

   409 

   410       constantTag tag = cpool->tag_at(index);

   411       if (tag.is_klass()) {

   412         // The klass has been inserted into the constant pool

   413         // very recently.

   414         klass = KlassHandle(THREAD, cpool->resolved_klass_at(index));

   415       } else if (tag.is_symbol()) {

   416         klass_name = symbolHandle(THREAD, cpool->symbol_at(index));

   417       } else {

   418         assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");

   419         klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index));

   420       }

   421     }

   422   }

   423 

   424   if (klass.is_null()) {

   425     // Not found in constant pool.  Use the name to do the lookup.

   426     ciKlass* k = get_klass_by_name_impl(accessor,

   427                                         get_object(klass_name())->as_symbol(),

   428                                         false);

   429     // Calculate accessibility the hard way.

   430     if (!k->is_loaded()) {

   431       is_accessible = false;

   432     } else if (k->loader() != accessor->loader() &&

   433                get_klass_by_name_impl(accessor, k->name(), true) == NULL) {

   434       // Loaded only remotely.  Not linked yet.

   435       is_accessible = false;

   436     } else {

   437       // Linked locally, and we must also check public/private, etc.

   438       is_accessible = check_klass_accessibility(accessor, k->get_klassOop());

   439     }

   440     return k;

   441   }

   442 

   443   // Check for prior unloaded klass.  The SystemDictionary's answers

   444   // can vary over time but the compiler needs consistency.

   445   ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol();

   446   ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);

   447   if (unloaded_klass != NULL) {

   448     is_accessible = false;

   449     return unloaded_klass;

   450   }

   451 

   452   // It is known to be accessible, since it was found in the constant pool.

   453   is_accessible = true;

   454   return get_object(klass())->as_klass();

   455 }

   456 

   457 // ------------------------------------------------------------------

   458 // ciEnv::get_klass_by_index

   459 //

   460 // Get a klass from the constant pool.

   461 ciKlass* ciEnv::get_klass_by_index(ciInstanceKlass* accessor,

   462                                    int index,

   463                                    bool& is_accessible) {

   464   GUARDED_VM_ENTRY(return get_klass_by_index_impl(accessor, index, is_accessible);)

   465 }

   466 

   467 // ------------------------------------------------------------------

   468 // ciEnv::get_constant_by_index_impl

   469 //

   470 // Implementation of get_constant_by_index().

   471 ciConstant ciEnv::get_constant_by_index_impl(ciInstanceKlass* accessor,

   472                                              int index) {

   473   EXCEPTION_CONTEXT;

   474   instanceKlass* ik_accessor = accessor->get_instanceKlass();

   475   assert(ik_accessor->is_linked(), "must be linked before accessing constant pool");

   476   constantPoolOop cpool = ik_accessor->constants();

   477   constantTag tag = cpool->tag_at(index);

   478   if (tag.is_int()) {

   479     return ciConstant(T_INT, (jint)cpool->int_at(index));

   480   } else if (tag.is_long()) {

   481     return ciConstant((jlong)cpool->long_at(index));

   482   } else if (tag.is_float()) {

   483     return ciConstant((jfloat)cpool->float_at(index));

   484   } else if (tag.is_double()) {

   485     return ciConstant((jdouble)cpool->double_at(index));

   486   } else if (tag.is_string() || tag.is_unresolved_string()) {

   487     oop string = cpool->string_at(index, THREAD);

   488     if (HAS_PENDING_EXCEPTION) {

   489       CLEAR_PENDING_EXCEPTION;

   490       record_out_of_memory_failure();

   491       return ciConstant();

   492     }

   493     ciObject* constant = get_object(string);

   494     assert (constant->is_instance(), "must be an instance, or not? ");

   495     return ciConstant(T_OBJECT, constant);

   496   } else if (tag.is_klass() || tag.is_unresolved_klass()) {

   497     // 4881222: allow ldc to take a class type

   498     bool ignore;

   499     ciKlass* klass = get_klass_by_index_impl(accessor, index, ignore);

   500     if (HAS_PENDING_EXCEPTION) {

   501       CLEAR_PENDING_EXCEPTION;

   502       record_out_of_memory_failure();

   503       return ciConstant();

   504     }

   505     assert (klass->is_instance_klass() || klass->is_array_klass(),

   506             "must be an instance or array klass ");

   507     return ciConstant(T_OBJECT, klass);

   508   } else {

   509     ShouldNotReachHere();

   510     return ciConstant();

   511   }

   512 }

   513 

   514 // ------------------------------------------------------------------

   515 // ciEnv::is_unresolved_string_impl

   516 //

   517 // Implementation of is_unresolved_string().

   518 bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const {

   519   EXCEPTION_CONTEXT;

   520   assert(accessor->is_linked(), "must be linked before accessing constant pool");

   521   constantPoolOop cpool = accessor->constants();

   522   constantTag tag = cpool->tag_at(index);

   523   return tag.is_unresolved_string();

   524 }

   525 

   526 // ------------------------------------------------------------------

   527 // ciEnv::is_unresolved_klass_impl

   528 //

   529 // Implementation of is_unresolved_klass().

   530 bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const {

   531   EXCEPTION_CONTEXT;

   532   assert(accessor->is_linked(), "must be linked before accessing constant pool");

   533   constantPoolOop cpool = accessor->constants();

   534   constantTag tag = cpool->tag_at(index);

   535   return tag.is_unresolved_klass();

   536 }

   537 

   538 // ------------------------------------------------------------------

   539 // ciEnv::get_constant_by_index

   540 //

   541 // Pull a constant out of the constant pool.  How appropriate.

   542 //

   543 // Implementation note: this query is currently in no way cached.

   544 ciConstant ciEnv::get_constant_by_index(ciInstanceKlass* accessor,

   545                                         int index) {

   546   GUARDED_VM_ENTRY(return get_constant_by_index_impl(accessor, index); )

   547 }

   548 

   549 // ------------------------------------------------------------------

   550 // ciEnv::is_unresolved_string

   551 //

   552 // Check constant pool

   553 //

   554 // Implementation note: this query is currently in no way cached.

   555 bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor,

   556                                         int index) const {

   557   GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); )

   558 }

   559 

   560 // ------------------------------------------------------------------

   561 // ciEnv::is_unresolved_klass

   562 //

   563 // Check constant pool

   564 //

   565 // Implementation note: this query is currently in no way cached.

   566 bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor,

   567                                         int index) const {

   568   GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); )

   569 }

   570 

   571 // ------------------------------------------------------------------

   572 // ciEnv::get_field_by_index_impl

   573 //

   574 // Implementation of get_field_by_index.

   575 //

   576 // Implementation note: the results of field lookups are cached

   577 // in the accessor klass.

   578 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,

   579                                         int index) {

   580   ciConstantPoolCache* cache = accessor->field_cache();

   581   if (cache == NULL) {

   582     ciField* field = new (arena()) ciField(accessor, index);

   583     return field;

   584   } else {

   585     ciField* field = (ciField*)cache->get(index);

   586     if (field == NULL) {

   587       field = new (arena()) ciField(accessor, index);

   588       cache->insert(index, field);

   589     }

   590     return field;

   591   }

   592 }

   593 

   594 // ------------------------------------------------------------------

   595 // ciEnv::get_field_by_index

   596 //

   597 // Get a field by index from a klass's constant pool.

   598 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,

   599                                    int index) {

   600   GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)

   601 }

   602 

   603 // ------------------------------------------------------------------

   604 // ciEnv::lookup_method

   605 //

   606 // Perform an appropriate method lookup based on accessor, holder,

   607 // name, signature, and bytecode.

   608 methodOop ciEnv::lookup_method(instanceKlass*  accessor,

   609                                instanceKlass*  holder,

   610                                symbolOop       name,

   611                                symbolOop       sig,

   612                                Bytecodes::Code bc) {

   613   EXCEPTION_CONTEXT;

   614   KlassHandle h_accessor(THREAD, accessor);

   615   KlassHandle h_holder(THREAD, holder);

   616   symbolHandle h_name(THREAD, name);

   617   symbolHandle h_sig(THREAD, sig);

   618   LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));

   619   methodHandle dest_method;

   620   switch (bc) {

   621   case Bytecodes::_invokestatic:

   622     dest_method =

   623       LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor);

   624     break;

   625   case Bytecodes::_invokespecial:

   626     dest_method =

   627       LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor);

   628     break;

   629   case Bytecodes::_invokeinterface:

   630     dest_method =

   631       LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig,

   632                                                               h_accessor, true);

   633     break;

   634   case Bytecodes::_invokevirtual:

   635     dest_method =

   636       LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig,

   637                                                             h_accessor, true);

   638     break;

   639   default: ShouldNotReachHere();

   640   }

   641 

   642   return dest_method();

   643 }

   644 

   645 

   646 // ------------------------------------------------------------------

   647 // ciEnv::get_method_by_index_impl

   648 ciMethod* ciEnv::get_method_by_index_impl(ciInstanceKlass* accessor,

   649                                      int index, Bytecodes::Code bc) {

   650   // Get the method's declared holder.

   651 

   652   assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");

   653   constantPoolHandle cpool = accessor->get_instanceKlass()->constants();

   654   int holder_index = cpool->klass_ref_index_at(index);

   655   bool holder_is_accessible;

   656   ciKlass* holder = get_klass_by_index_impl(accessor, holder_index, holder_is_accessible);

   657   ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);

   658 

   659   // Get the method's name and signature.

   660   int nt_index = cpool->name_and_type_ref_index_at(index);

   661   int sig_index = cpool->signature_ref_index_at(nt_index);

   662   symbolOop name_sym = cpool->name_ref_at(index);

   663   symbolOop sig_sym = cpool->symbol_at(sig_index);

   664 

   665   if (holder_is_accessible) { // Our declared holder is loaded.

   666     instanceKlass* lookup = declared_holder->get_instanceKlass();

   667     methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);

   668     if (m != NULL) {

   669       // We found the method.

   670       return get_object(m)->as_method();

   671     }

   672   }

   673 

   674   // Either the declared holder was not loaded, or the method could

   675   // not be found.  Create a dummy ciMethod to represent the failed

   676   // lookup.

   677 

   678   return get_unloaded_method(declared_holder,

   679                              get_object(name_sym)->as_symbol(),

   680                              get_object(sig_sym)->as_symbol());

   681 }

   682 

   683 

   684 // ------------------------------------------------------------------

   685 // ciEnv::get_instance_klass_for_declared_method_holder

   686 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {

   687   // For the case of <array>.clone(), the method holder can be a ciArrayKlass

   688   // instead of a ciInstanceKlass.  For that case simply pretend that the

   689   // declared holder is Object.clone since that's where the call will bottom out.

   690   // A more correct fix would trickle out through many interfaces in CI,

   691   // requiring ciInstanceKlass* to become ciKlass* and many more places would

   692   // require checks to make sure the expected type was found.  Given that this

   693   // only occurs for clone() the more extensive fix seems like overkill so

   694   // instead we simply smear the array type into Object.

   695   if (method_holder->is_instance_klass()) {

   696     return method_holder->as_instance_klass();

   697   } else if (method_holder->is_array_klass()) {

   698     return current()->Object_klass();

   699   } else {

   700     ShouldNotReachHere();

   701   }

   702   return NULL;

   703 }

   704 

   705 

   706 

   707 

   708 // ------------------------------------------------------------------

   709 // ciEnv::get_method_by_index

   710 ciMethod* ciEnv::get_method_by_index(ciInstanceKlass* accessor,

   711                                      int index, Bytecodes::Code bc) {

   712   GUARDED_VM_ENTRY(return get_method_by_index_impl(accessor, index, bc);)

   713 }

   714 

   715 // ------------------------------------------------------------------

   716 // ciEnv::name_buffer

   717 char *ciEnv::name_buffer(int req_len) {

   718   if (_name_buffer_len < req_len) {

   719     if (_name_buffer == NULL) {

   720       _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);

   721       _name_buffer_len = req_len;

   722     } else {

   723       _name_buffer =

   724         (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);

   725       _name_buffer_len = req_len;

   726     }

   727   }

   728   return _name_buffer;

   729 }

   730 

   731 // ------------------------------------------------------------------

   732 // ciEnv::is_in_vm

   733 bool ciEnv::is_in_vm() {

   734   return JavaThread::current()->thread_state() == _thread_in_vm;

   735 }

   736 

   737 bool ciEnv::system_dictionary_modification_counter_changed() {

   738   return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();

   739 }

   740 

   741 // ------------------------------------------------------------------

   742 // ciEnv::check_for_system_dictionary_modification

   743 // Check for changes to the system dictionary during compilation

   744 // class loads, evolution, breakpoints

   745 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) {

   746   if (failing())  return;  // no need for further checks

   747 

   748   // Dependencies must be checked when the system dictionary changes.

   749   // If logging is enabled all violated dependences will be recorded in

   750   // the log.  In debug mode check dependencies even if the system

   751   // dictionary hasn't changed to verify that no invalid dependencies

   752   // were inserted.  Any violated dependences in this case are dumped to

   753   // the tty.

   754 

   755   bool counter_changed = system_dictionary_modification_counter_changed();

   756   bool test_deps = counter_changed;

   757   DEBUG_ONLY(test_deps = true);

   758   if (!test_deps)  return;

   759 

   760   bool print_failures = false;

   761   DEBUG_ONLY(print_failures = !counter_changed);

   762 

   763   bool keep_going = (print_failures || xtty != NULL);

   764 

   765   int violated = 0;

   766 

   767   for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {

   768     klassOop witness = deps.check_dependency();

   769     if (witness != NULL) {

   770       ++violated;

   771       if (print_failures)  deps.print_dependency(witness, /*verbose=*/ true);

   772       // If there's no log and we're not sanity-checking, we're done.

   773       if (!keep_going)     break;

   774     }

   775   }

   776 

   777   if (violated != 0) {

   778     assert(counter_changed, "failed dependencies, but counter didn't change");

   779     record_failure("concurrent class loading");

   780   }

   781 }

   782 

   783 // ------------------------------------------------------------------

   784 // ciEnv::register_method

   785 void ciEnv::register_method(ciMethod* target,

   786                             int entry_bci,

   787                             CodeOffsets* offsets,

   788                             int orig_pc_offset,

   789                             CodeBuffer* code_buffer,

   790                             int frame_words,

   791                             OopMapSet* oop_map_set,

   792                             ExceptionHandlerTable* handler_table,

   793                             ImplicitExceptionTable* inc_table,

   794                             AbstractCompiler* compiler,

   795                             int comp_level,

   796                             bool has_debug_info,

   797                             bool has_unsafe_access) {

   798   VM_ENTRY_MARK;

   799   nmethod* nm = NULL;

   800   {

   801     // To prevent compile queue updates.

   802     MutexLocker locker(MethodCompileQueue_lock, THREAD);

   803 

   804     // Prevent SystemDictionary::add_to_hierarchy from running

   805     // and invalidating our dependencies until we install this method.

   806     MutexLocker ml(Compile_lock);

   807 

   808     if (log() != NULL) {

   809       // Log the dependencies which this compilation declares.

   810       dependencies()->log_all_dependencies();

   811     }

   812 

   813     // Encode the dependencies now, so we can check them right away.

   814     dependencies()->encode_content_bytes();

   815 

   816     // Check for {class loads, evolution, breakpoints} during compilation

   817     check_for_system_dictionary_modification(target);

   818 

   819     methodHandle method(THREAD, target->get_methodOop());

   820 

   821     if (failing()) {

   822       // While not a true deoptimization, it is a preemptive decompile.

   823       methodDataOop mdo = method()->method_data();

   824       if (mdo != NULL) {

   825         mdo->inc_decompile_count();

   826       }

   827 

   828       // All buffers in the CodeBuffer are allocated in the CodeCache.

   829       // If the code buffer is created on each compile attempt

   830       // as in C2, then it must be freed.

   831       code_buffer->free_blob();

   832       return;

   833     }

   834 

   835     assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");

   836     assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");

   837 

   838     nm =  nmethod::new_nmethod(method,

   839                                compile_id(),

   840                                entry_bci,

   841                                offsets,

   842                                orig_pc_offset,

   843                                debug_info(), dependencies(), code_buffer,

   844                                frame_words, oop_map_set,

   845                                handler_table, inc_table,

   846                                compiler, comp_level);

   847 

   848     // Free codeBlobs

   849     code_buffer->free_blob();

   850 

   851     // stress test 6243940 by immediately making the method

   852     // non-entrant behind the system's back. This has serious

   853     // side effects on the code cache and is not meant for

   854     // general stress testing

   855     if (nm != NULL && StressNonEntrant) {

   856       MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);

   857       NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),

   858                   SharedRuntime::get_handle_wrong_method_stub());

   859     }

   860 

   861     if (nm == NULL) {

   862       // The CodeCache is full.  Print out warning and disable compilation.

   863       record_failure("code cache is full");

   864       UseInterpreter = true;

   865       if (UseCompiler || AlwaysCompileLoopMethods ) {

   866 #ifndef PRODUCT

   867         warning("CodeCache is full. Compiler has been disabled");

   868         if (CompileTheWorld || ExitOnFullCodeCache) {

   869           before_exit(JavaThread::current());

   870           exit_globals(); // will delete tty

   871           vm_direct_exit(CompileTheWorld ? 0 : 1);

   872         }

   873 #endif

   874         UseCompiler               = false;

   875         AlwaysCompileLoopMethods  = false;

   876       }

   877     } else {

   878       NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); )

   879       nm->set_has_unsafe_access(has_unsafe_access);

   880 

   881       // Record successful registration.

   882       // (Put nm into the task handle *before* publishing to the Java heap.)

   883       if (task() != NULL)  task()->set_code(nm);

   884 

   885       if (entry_bci == InvocationEntryBci) {

   886 #ifdef TIERED

   887         // If there is an old version we're done with it

   888         nmethod* old = method->code();

   889         if (TraceMethodReplacement && old != NULL) {

   890           ResourceMark rm;

   891           char *method_name = method->name_and_sig_as_C_string();

   892           tty->print_cr("Replacing method %s", method_name);

   893         }

   894         if (old != NULL ) {

   895           old->make_not_entrant();

   896         }

   897 #endif // TIERED

   898         if (TraceNMethodInstalls ) {

   899           ResourceMark rm;

   900           char *method_name = method->name_and_sig_as_C_string();

   901           ttyLocker ttyl;

   902           tty->print_cr("Installing method (%d) %s ",

   903                         comp_level,

   904                         method_name);

   905         }

   906         // Allow the code to be executed

   907         method->set_code(method, nm);

   908       } else {

   909         if (TraceNMethodInstalls ) {

   910           ResourceMark rm;

   911           char *method_name = method->name_and_sig_as_C_string();

   912           ttyLocker ttyl;

   913           tty->print_cr("Installing osr method (%d) %s @ %d",

   914                         comp_level,

   915                         method_name,

   916                         entry_bci);

   917         }

   918         instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);

   919 

   920       }

   921     }

   922   }

   923   // JVMTI -- compiled method notification (must be done outside lock)

   924   if (nm != NULL) {

   925     nm->post_compiled_method_load_event();

   926   }

   927 

   928 }

   929 

   930 

   931 // ------------------------------------------------------------------

   932 // ciEnv::find_system_klass

   933 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {

   934   VM_ENTRY_MARK;

   935   return get_klass_by_name_impl(NULL, klass_name, false);

   936 }

   937 

   938 // ------------------------------------------------------------------

   939 // ciEnv::comp_level

   940 int ciEnv::comp_level() {

   941   if (task() == NULL)  return CompLevel_full_optimization;

   942   return task()->comp_level();

   943 }

   944 

   945 // ------------------------------------------------------------------

   946 // ciEnv::compile_id

   947 uint ciEnv::compile_id() {

   948   if (task() == NULL)  return 0;

   949   return task()->compile_id();

   950 }

   951 

   952 // ------------------------------------------------------------------

   953 // ciEnv::notice_inlined_method()

   954 void ciEnv::notice_inlined_method(ciMethod* method) {

   955   _num_inlined_bytecodes += method->code_size();

   956 }

   957 

   958 // ------------------------------------------------------------------

   959 // ciEnv::num_inlined_bytecodes()

   960 int ciEnv::num_inlined_bytecodes() const {

   961   return _num_inlined_bytecodes;

   962 }

   963 

   964 // ------------------------------------------------------------------

   965 // ciEnv::record_failure()

   966 void ciEnv::record_failure(const char* reason) {

   967   if (log() != NULL) {

   968     log()->elem("failure reason='%s'", reason);

   969   }

   970   if (_failure_reason == NULL) {

   971     // Record the first failure reason.

   972     _failure_reason = reason;

   973   }

   974 }

   975 

   976 // ------------------------------------------------------------------

   977 // ciEnv::record_method_not_compilable()

   978 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {

   979   int new_compilable =

   980     all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;

   981 

   982   // Only note transitions to a worse state

   983   if (new_compilable > _compilable) {

   984     if (log() != NULL) {

   985       if (all_tiers) {

   986         log()->elem("method_not_compilable");

   987       } else {

   988         log()->elem("method_not_compilable_at_tier");

   989       }

   990     }

   991     _compilable = new_compilable;

   992 

   993     // Reset failure reason; this one is more important.

   994     _failure_reason = NULL;

   995     record_failure(reason);

   996   }

   997 }

   998 

   999 // ------------------------------------------------------------------

  1000 // ciEnv::record_out_of_memory_failure()

  1001 void ciEnv::record_out_of_memory_failure() {

  1002   // If memory is low, we stop compiling methods.

  1003   record_method_not_compilable("out of memory");

  1004 }