jdk8-mips64-public/hotspot: src/share/vm/ci/ciEnv.cpp@6ca61c728c2d (annotated)

src/share/vm/ci/ciEnv.cpp@6ca61c728c2d (annotated)

src/share/vm/ci/ciEnv.cpp

Fri, 25 Jul 2008 11:32:56 -0700

author: never
date: Fri, 25 Jul 2008 11:32:56 -0700
changeset 685: 6ca61c728c2d
parent 435: a61af66fc99e
child 866: a45484ea312d
permissions: -rw-r--r--

6712835: Server compiler fails with assertion (loop_count < K,"infinite loop in PhaseIterGVN::transform")
Reviewed-by: kvn

 /*
  * Copyright 1999-2007 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_ciEnv.cpp.incl"
 // ciEnv
 //
 // This class is the top level broker for requests from the compiler
 // to the VM.
 ciObject*              ciEnv::_null_object_instance;
 ciMethodKlass*         ciEnv::_method_klass_instance;
 ciSymbolKlass*         ciEnv::_symbol_klass_instance;
 ciKlassKlass*          ciEnv::_klass_klass_instance;
 ciInstanceKlassKlass*  ciEnv::_instance_klass_klass_instance;
 ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance;
 ciObjArrayKlassKlass*  ciEnv::_obj_array_klass_klass_instance;
 ciInstanceKlass* ciEnv::_ArrayStoreException;
 ciInstanceKlass* ciEnv::_Class;
 ciInstanceKlass* ciEnv::_ClassCastException;
 ciInstanceKlass* ciEnv::_Object;
 ciInstanceKlass* ciEnv::_Throwable;
 ciInstanceKlass* ciEnv::_Thread;
 ciInstanceKlass* ciEnv::_OutOfMemoryError;
 ciInstanceKlass* ciEnv::_String;
 ciSymbol*        ciEnv::_unloaded_cisymbol = NULL;
 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
 jobject ciEnv::_ArrayStoreException_handle = NULL;
 jobject ciEnv::_ClassCastException_handle = NULL;
 #ifndef PRODUCT
 static bool firstEnv = true;
 #endif /* PRODUCT */
 // ------------------------------------------------------------------
 // ciEnv::ciEnv
 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {
   VM_ENTRY_MARK;
   // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
   thread->set_env(this);
   assert(ciEnv::current() == this, "sanity");
   _oop_recorder = NULL;
   _debug_info = NULL;
   _dependencies = NULL;
   _failure_reason = NULL;
   _compilable = MethodCompilable;
   _break_at_compile = false;
   _compiler_data = NULL;
 #ifndef PRODUCT
   assert(!firstEnv, "not initialized properly");
 #endif /* !PRODUCT */
   _system_dictionary_modification_counter = system_dictionary_modification_counter;
   _num_inlined_bytecodes = 0;
   assert(task == NULL || thread->task() == task, "sanity");
   _task = task;
   _log = NULL;
   // Temporary buffer for creating symbols and such.
   _name_buffer = NULL;
   _name_buffer_len = 0;
   _arena   = &_ciEnv_arena;
   _factory = new (_arena) ciObjectFactory(_arena, 128);
   // Preload commonly referenced system ciObjects.
   // During VM initialization, these instances have not yet been created.
   // Assertions ensure that these instances are not accessed before
   // their initialization.
   assert(Universe::is_fully_initialized(), "should be complete");
   oop o = Universe::null_ptr_exception_instance();
   assert(o != NULL, "should have been initialized");
   _NullPointerException_instance = get_object(o)->as_instance();
   o = Universe::arithmetic_exception_instance();
   assert(o != NULL, "should have been initialized");
   _ArithmeticException_instance = get_object(o)->as_instance();
   _ArrayIndexOutOfBoundsException_instance = NULL;
   _ArrayStoreException_instance = NULL;
   _ClassCastException_instance = NULL;
 }
 ciEnv::ciEnv(Arena* arena) {
   ASSERT_IN_VM;
   // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
   CompilerThread* current_thread = CompilerThread::current();
   assert(current_thread->env() == NULL, "must be");
   current_thread->set_env(this);
   assert(ciEnv::current() == this, "sanity");
   _oop_recorder = NULL;
   _debug_info = NULL;
   _dependencies = NULL;
   _failure_reason = NULL;
   _compilable = MethodCompilable_never;
   _break_at_compile = false;
   _compiler_data = NULL;
 #ifndef PRODUCT
   assert(firstEnv, "must be first");
   firstEnv = false;
 #endif /* !PRODUCT */
   _system_dictionary_modification_counter = 0;
   _num_inlined_bytecodes = 0;
   _task = NULL;
   _log = NULL;
   // Temporary buffer for creating symbols and such.
   _name_buffer = NULL;
   _name_buffer_len = 0;
   _arena   = arena;
   _factory = new (_arena) ciObjectFactory(_arena, 128);
   // Preload commonly referenced system ciObjects.
   // During VM initialization, these instances have not yet been created.
   // Assertions ensure that these instances are not accessed before
   // their initialization.
   assert(Universe::is_fully_initialized(), "must be");
   oop o = Universe::null_ptr_exception_instance();
   assert(o != NULL, "should have been initialized");
   _NullPointerException_instance = get_object(o)->as_instance();
   o = Universe::arithmetic_exception_instance();
   assert(o != NULL, "should have been initialized");
   _ArithmeticException_instance = get_object(o)->as_instance();
   _ArrayIndexOutOfBoundsException_instance = NULL;
   _ArrayStoreException_instance = NULL;
   _ClassCastException_instance = NULL;
 }
 ciEnv::~ciEnv() {
   CompilerThread* current_thread = CompilerThread::current();
   current_thread->set_env(NULL);
 }
 // ------------------------------------------------------------------
 // helper for lazy exception creation
 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) {
   VM_ENTRY_MARK;
   if (handle == NULL) {
     // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
     klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
     jobject objh = NULL;
     if (!HAS_PENDING_EXCEPTION && k != NULL) {
       oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD);
       if (!HAS_PENDING_EXCEPTION)
         objh = JNIHandles::make_global(obj);
     }
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
     } else {
       handle = objh;
     }
   }
   oop obj = JNIHandles::resolve(handle);
   return obj == NULL? NULL: get_object(obj)->as_instance();
 }
 // ------------------------------------------------------------------
 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc.
 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
   if (_ArrayIndexOutOfBoundsException_instance == NULL) {
     _ArrayIndexOutOfBoundsException_instance
           = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
           vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException());
   }
   return _ArrayIndexOutOfBoundsException_instance;
 }
 ciInstance* ciEnv::ArrayStoreException_instance() {
   if (_ArrayStoreException_instance == NULL) {
     _ArrayStoreException_instance
           = get_or_create_exception(_ArrayStoreException_handle,
           vmSymbolHandles::java_lang_ArrayStoreException());
   }
   return _ArrayStoreException_instance;
 }
 ciInstance* ciEnv::ClassCastException_instance() {
   if (_ClassCastException_instance == NULL) {
     _ClassCastException_instance
           = get_or_create_exception(_ClassCastException_handle,
           vmSymbolHandles::java_lang_ClassCastException());
   }
   return _ClassCastException_instance;
 }
 // ------------------------------------------------------------------
 // ciEnv::get_method_from_handle
 ciMethod* ciEnv::get_method_from_handle(jobject method) {
   VM_ENTRY_MARK;
   return get_object(JNIHandles::resolve(method))->as_method();
 }
 // ------------------------------------------------------------------
 // ciEnv::make_array
 ciArray* ciEnv::make_array(GrowableArray<ciObject*>* objects) {
   VM_ENTRY_MARK;
   int length = objects->length();
   objArrayOop a = oopFactory::new_system_objArray(length, THREAD);
   if (HAS_PENDING_EXCEPTION) {
     CLEAR_PENDING_EXCEPTION;
     record_out_of_memory_failure();
     return NULL;
   }
   for (int i = 0; i < length; i++) {
     a->obj_at_put(i, objects->at(i)->get_oop());
   }
   assert(a->is_perm(), "");
   return get_object(a)->as_array();
 }
 // ------------------------------------------------------------------
 // ciEnv::array_element_offset_in_bytes
 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {
   VM_ENTRY_MARK;
   objArrayOop a = (objArrayOop)a_h->get_oop();
   assert(a->is_objArray(), "");
   int length = a->length();
   oop o = o_h->get_oop();
   for (int i = 0; i < length; i++) {
     if (a->obj_at(i) == o)  return i;
   }
   return -1;
 }
 // ------------------------------------------------------------------
 // ciEnv::check_klass_accessiblity
 //
 // Note: the logic of this method should mirror the logic of
 // constantPoolOopDesc::verify_constant_pool_resolve.
 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
                                       klassOop resolved_klass) {
   if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
     return true;
   }
   if (accessing_klass->is_obj_array()) {
     accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
   }
   if (!accessing_klass->is_instance_klass()) {
     return true;
   }
   if (resolved_klass->klass_part()->oop_is_objArray()) {
     // Find the element klass, if this is an array.
     resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass();
   }
   if (resolved_klass->klass_part()->oop_is_instance()) {
     return Reflection::verify_class_access(accessing_klass->get_klassOop(),
                                            resolved_klass,
                                            true);
   }
   return true;
 }
 // ------------------------------------------------------------------
 // ciEnv::get_klass_by_name_impl
 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
                                        ciSymbol* name,
                                        bool require_local) {
   ASSERT_IN_VM;
   EXCEPTION_CONTEXT;
   // Now we need to check the SystemDictionary
   symbolHandle sym(THREAD, name->get_symbolOop());
   if (sym->byte_at(0) == 'L' &&
     sym->byte_at(sym->utf8_length()-1) == ';') {
     // This is a name from a signature.  Strip off the trimmings.
     sym = oopFactory::new_symbol_handle(sym->as_utf8()+1,
                                         sym->utf8_length()-2,
                                         KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
     name = get_object(sym())->as_symbol();
   }
   // Check for prior unloaded klass.  The SystemDictionary's answers
   // can vary over time but the compiler needs consistency.
   ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
   if (unloaded_klass != NULL) {
     if (require_local)  return NULL;
     return unloaded_klass;
   }
   Handle loader(THREAD, (oop)NULL);
   Handle domain(THREAD, (oop)NULL);
   if (accessing_klass != NULL) {
     loader = Handle(THREAD, accessing_klass->loader());
     domain = Handle(THREAD, accessing_klass->protection_domain());
   }
   // setup up the proper type to return on OOM
   ciKlass* fail_type;
   if (sym->byte_at(0) == '[') {
     fail_type = _unloaded_ciobjarrayklass;
   } else {
     fail_type = _unloaded_ciinstance_klass;
   }
   klassOop found_klass;
   if (!require_local) {
     found_klass =
       SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
                                                                  KILL_COMPILE_ON_FATAL_(fail_type));
   } else {
     found_klass =
       SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
                                                      KILL_COMPILE_ON_FATAL_(fail_type));
   }
   if (found_klass != NULL) {
     // Found it.  Build a CI handle.
     return get_object(found_klass)->as_klass();
   }
   // If we fail to find an array klass, look again for its element type.
   // The element type may be available either locally or via constraints.
   // In either case, if we can find the element type in the system dictionary,
   // we must build an array type around it.  The CI requires array klasses
   // to be loaded if their element klasses are loaded, except when memory
   // is exhausted.
   if (sym->byte_at(0) == '[' &&
       (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
     // We have an unloaded array.
     // Build it on the fly if the element class exists.
     symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1,
                                                 sym->utf8_length()-1,
                                                 KILL_COMPILE_ON_FATAL_(fail_type));
     // Get element ciKlass recursively.
     ciKlass* elem_klass =
       get_klass_by_name_impl(accessing_klass,
                              get_object(elem_sym)->as_symbol(),
                              require_local);
     if (elem_klass != NULL && elem_klass->is_loaded()) {
       // Now make an array for it
       return ciObjArrayKlass::make_impl(elem_klass);
     }
   }
   if (require_local)  return NULL;
   // Not yet loaded into the VM, or not governed by loader constraints.
   // Make a CI representative for it.
   return get_unloaded_klass(accessing_klass, name);
 }
 // ------------------------------------------------------------------
 // ciEnv::get_klass_by_name
 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
                                   ciSymbol* klass_name,
                                   bool require_local) {
   GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
                                                  klass_name,
                                                  require_local);)
 }
 // ------------------------------------------------------------------
 // ciEnv::get_klass_by_index_impl
 //
 // Implementation of get_klass_by_index.
 ciKlass* ciEnv::get_klass_by_index_impl(ciInstanceKlass* accessor,
                                         int index,
                                         bool& is_accessible) {
   assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");
   EXCEPTION_CONTEXT;
   constantPoolHandle cpool(THREAD, accessor->get_instanceKlass()->constants());
   KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index));
   symbolHandle klass_name;
   if (klass.is_null()) {
     // The klass has not been inserted into the constant pool.
     // Try to look it up by name.
     {
       // We have to lock the cpool to keep the oop from being resolved
       // while we are accessing it.
       ObjectLocker ol(cpool, THREAD);
       constantTag tag = cpool->tag_at(index);
       if (tag.is_klass()) {
         // The klass has been inserted into the constant pool
         // very recently.
         klass = KlassHandle(THREAD, cpool->resolved_klass_at(index));
       } else if (tag.is_symbol()) {
         klass_name = symbolHandle(THREAD, cpool->symbol_at(index));
       } else {
         assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");
         klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index));
       }
     }
   }
   if (klass.is_null()) {
     // Not found in constant pool.  Use the name to do the lookup.
     ciKlass* k = get_klass_by_name_impl(accessor,
                                         get_object(klass_name())->as_symbol(),
                                         false);
     // Calculate accessibility the hard way.
     if (!k->is_loaded()) {
       is_accessible = false;
     } else if (k->loader() != accessor->loader() &&
                get_klass_by_name_impl(accessor, k->name(), true) == NULL) {
       // Loaded only remotely.  Not linked yet.
       is_accessible = false;
     } else {
       // Linked locally, and we must also check public/private, etc.
       is_accessible = check_klass_accessibility(accessor, k->get_klassOop());
     }
     return k;
   }
   // Check for prior unloaded klass.  The SystemDictionary's answers
   // can vary over time but the compiler needs consistency.
   ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol();
   ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
   if (unloaded_klass != NULL) {
     is_accessible = false;
     return unloaded_klass;
   }
   // It is known to be accessible, since it was found in the constant pool.
   is_accessible = true;
   return get_object(klass())->as_klass();
 }
 // ------------------------------------------------------------------
 // ciEnv::get_klass_by_index
 //
 // Get a klass from the constant pool.
 ciKlass* ciEnv::get_klass_by_index(ciInstanceKlass* accessor,
                                    int index,
                                    bool& is_accessible) {
   GUARDED_VM_ENTRY(return get_klass_by_index_impl(accessor, index, is_accessible);)
 }
 // ------------------------------------------------------------------
 // ciEnv::get_constant_by_index_impl
 //
 // Implementation of get_constant_by_index().
 ciConstant ciEnv::get_constant_by_index_impl(ciInstanceKlass* accessor,
                                              int index) {
   EXCEPTION_CONTEXT;
   instanceKlass* ik_accessor = accessor->get_instanceKlass();
   assert(ik_accessor->is_linked(), "must be linked before accessing constant pool");
   constantPoolOop cpool = ik_accessor->constants();
   constantTag tag = cpool->tag_at(index);
   if (tag.is_int()) {
     return ciConstant(T_INT, (jint)cpool->int_at(index));
   } else if (tag.is_long()) {
     return ciConstant((jlong)cpool->long_at(index));
   } else if (tag.is_float()) {
     return ciConstant((jfloat)cpool->float_at(index));
   } else if (tag.is_double()) {
     return ciConstant((jdouble)cpool->double_at(index));
   } else if (tag.is_string() || tag.is_unresolved_string()) {
     oop string = cpool->string_at(index, THREAD);
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
       record_out_of_memory_failure();
       return ciConstant();
     }
     ciObject* constant = get_object(string);
     assert (constant->is_instance(), "must be an instance, or not? ");
     return ciConstant(T_OBJECT, constant);
   } else if (tag.is_klass() || tag.is_unresolved_klass()) {
     // 4881222: allow ldc to take a class type
     bool ignore;
     ciKlass* klass = get_klass_by_index_impl(accessor, index, ignore);
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
       record_out_of_memory_failure();
       return ciConstant();
     }
     assert (klass->is_instance_klass() || klass->is_array_klass(),
             "must be an instance or array klass ");
     return ciConstant(T_OBJECT, klass);
   } else {
     ShouldNotReachHere();
     return ciConstant();
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::is_unresolved_string_impl
 //
 // Implementation of is_unresolved_string().
 bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const {
   EXCEPTION_CONTEXT;
   assert(accessor->is_linked(), "must be linked before accessing constant pool");
   constantPoolOop cpool = accessor->constants();
   constantTag tag = cpool->tag_at(index);
   return tag.is_unresolved_string();
 }
 // ------------------------------------------------------------------
 // ciEnv::is_unresolved_klass_impl
 //
 // Implementation of is_unresolved_klass().
 bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const {
   EXCEPTION_CONTEXT;
   assert(accessor->is_linked(), "must be linked before accessing constant pool");
   constantPoolOop cpool = accessor->constants();
   constantTag tag = cpool->tag_at(index);
   return tag.is_unresolved_klass();
 }
 // ------------------------------------------------------------------
 // ciEnv::get_constant_by_index
 //
 // Pull a constant out of the constant pool.  How appropriate.
 //
 // Implementation note: this query is currently in no way cached.
 ciConstant ciEnv::get_constant_by_index(ciInstanceKlass* accessor,
                                         int index) {
   GUARDED_VM_ENTRY(return get_constant_by_index_impl(accessor, index); )
 }
 // ------------------------------------------------------------------
 // ciEnv::is_unresolved_string
 //
 // Check constant pool
 //
 // Implementation note: this query is currently in no way cached.
 bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor,
                                         int index) const {
   GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); )
 }
 // ------------------------------------------------------------------
 // ciEnv::is_unresolved_klass
 //
 // Check constant pool
 //
 // Implementation note: this query is currently in no way cached.
 bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor,
                                         int index) const {
   GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); )
 }
 // ------------------------------------------------------------------
 // ciEnv::get_field_by_index_impl
 //
 // Implementation of get_field_by_index.
 //
 // Implementation note: the results of field lookups are cached
 // in the accessor klass.
 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
                                         int index) {
   ciConstantPoolCache* cache = accessor->field_cache();
   if (cache == NULL) {
     ciField* field = new (arena()) ciField(accessor, index);
     return field;
   } else {
     ciField* field = (ciField*)cache->get(index);
     if (field == NULL) {
       field = new (arena()) ciField(accessor, index);
       cache->insert(index, field);
     }
     return field;
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::get_field_by_index
 //
 // Get a field by index from a klass's constant pool.
 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
                                    int index) {
   GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
 }
 // ------------------------------------------------------------------
 // ciEnv::lookup_method
 //
 // Perform an appropriate method lookup based on accessor, holder,
 // name, signature, and bytecode.
 methodOop ciEnv::lookup_method(instanceKlass*  accessor,
                                instanceKlass*  holder,
                                symbolOop       name,
                                symbolOop       sig,
                                Bytecodes::Code bc) {
   EXCEPTION_CONTEXT;
   KlassHandle h_accessor(THREAD, accessor);
   KlassHandle h_holder(THREAD, holder);
   symbolHandle h_name(THREAD, name);
   symbolHandle h_sig(THREAD, sig);
   LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
   methodHandle dest_method;
   switch (bc) {
   case Bytecodes::_invokestatic:
     dest_method =
       LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor);
     break;
   case Bytecodes::_invokespecial:
     dest_method =
       LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor);
     break;
   case Bytecodes::_invokeinterface:
     dest_method =
       LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig,
                                                               h_accessor, true);
     break;
   case Bytecodes::_invokevirtual:
     dest_method =
       LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig,
                                                             h_accessor, true);
     break;
   default: ShouldNotReachHere();
   }
   return dest_method();
 }
 // ------------------------------------------------------------------
 // ciEnv::get_method_by_index_impl
 ciMethod* ciEnv::get_method_by_index_impl(ciInstanceKlass* accessor,
                                      int index, Bytecodes::Code bc) {
   // Get the method's declared holder.
   assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");
   constantPoolHandle cpool = accessor->get_instanceKlass()->constants();
   int holder_index = cpool->klass_ref_index_at(index);
   bool holder_is_accessible;
   ciKlass* holder = get_klass_by_index_impl(accessor, holder_index, holder_is_accessible);
   ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
   // Get the method's name and signature.
   int nt_index = cpool->name_and_type_ref_index_at(index);
   int sig_index = cpool->signature_ref_index_at(nt_index);
   symbolOop name_sym = cpool->name_ref_at(index);
   symbolOop sig_sym = cpool->symbol_at(sig_index);
   if (holder_is_accessible) { // Our declared holder is loaded.
     instanceKlass* lookup = declared_holder->get_instanceKlass();
     methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
     if (m != NULL) {
       // We found the method.
       return get_object(m)->as_method();
     }
   }
   // Either the declared holder was not loaded, or the method could
   // not be found.  Create a dummy ciMethod to represent the failed
   // lookup.
   return get_unloaded_method(declared_holder,
                              get_object(name_sym)->as_symbol(),
                              get_object(sig_sym)->as_symbol());
 }
 // ------------------------------------------------------------------
 // ciEnv::get_instance_klass_for_declared_method_holder
 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
   // For the case of <array>.clone(), the method holder can be a ciArrayKlass
   // instead of a ciInstanceKlass.  For that case simply pretend that the
   // declared holder is Object.clone since that's where the call will bottom out.
   // A more correct fix would trickle out through many interfaces in CI,
   // requiring ciInstanceKlass* to become ciKlass* and many more places would
   // require checks to make sure the expected type was found.  Given that this
   // only occurs for clone() the more extensive fix seems like overkill so
   // instead we simply smear the array type into Object.
   if (method_holder->is_instance_klass()) {
     return method_holder->as_instance_klass();
   } else if (method_holder->is_array_klass()) {
     return current()->Object_klass();
   } else {
     ShouldNotReachHere();
   }
   return NULL;
 }
 // ------------------------------------------------------------------
 // ciEnv::get_method_by_index
 ciMethod* ciEnv::get_method_by_index(ciInstanceKlass* accessor,
                                      int index, Bytecodes::Code bc) {
   GUARDED_VM_ENTRY(return get_method_by_index_impl(accessor, index, bc);)
 }
 // ------------------------------------------------------------------
 // ciEnv::name_buffer
 char *ciEnv::name_buffer(int req_len) {
   if (_name_buffer_len < req_len) {
     if (_name_buffer == NULL) {
       _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
       _name_buffer_len = req_len;
     } else {
       _name_buffer =
         (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
       _name_buffer_len = req_len;
     }
   }
   return _name_buffer;
 }
 // ------------------------------------------------------------------
 // ciEnv::is_in_vm
 bool ciEnv::is_in_vm() {
   return JavaThread::current()->thread_state() == _thread_in_vm;
 }
 bool ciEnv::system_dictionary_modification_counter_changed() {
   return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
 }
 // ------------------------------------------------------------------
 // ciEnv::check_for_system_dictionary_modification
 // Check for changes to the system dictionary during compilation
 // class loads, evolution, breakpoints
 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) {
   if (failing())  return;  // no need for further checks
   // Dependencies must be checked when the system dictionary changes.
   // If logging is enabled all violated dependences will be recorded in
   // the log.  In debug mode check dependencies even if the system
   // dictionary hasn't changed to verify that no invalid dependencies
   // were inserted.  Any violated dependences in this case are dumped to
   // the tty.
   bool counter_changed = system_dictionary_modification_counter_changed();
   bool test_deps = counter_changed;
   DEBUG_ONLY(test_deps = true);
   if (!test_deps)  return;
   bool print_failures = false;
   DEBUG_ONLY(print_failures = !counter_changed);
   bool keep_going = (print_failures || xtty != NULL);
   int violated = 0;
   for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
     klassOop witness = deps.check_dependency();
     if (witness != NULL) {
       ++violated;
       if (print_failures)  deps.print_dependency(witness, /*verbose=*/ true);
       // If there's no log and we're not sanity-checking, we're done.
       if (!keep_going)     break;
     }
   }
   if (violated != 0) {
     assert(counter_changed, "failed dependencies, but counter didn't change");
     record_failure("concurrent class loading");
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::register_method
 void ciEnv::register_method(ciMethod* target,
                             int entry_bci,
                             CodeOffsets* offsets,
                             int orig_pc_offset,
                             CodeBuffer* code_buffer,
                             int frame_words,
                             OopMapSet* oop_map_set,
                             ExceptionHandlerTable* handler_table,
                             ImplicitExceptionTable* inc_table,
                             AbstractCompiler* compiler,
                             int comp_level,
                             bool has_debug_info,
                             bool has_unsafe_access) {
   VM_ENTRY_MARK;
   nmethod* nm = NULL;
   {
     // To prevent compile queue updates.
     MutexLocker locker(MethodCompileQueue_lock, THREAD);
     // Prevent SystemDictionary::add_to_hierarchy from running
     // and invalidating our dependencies until we install this method.
     MutexLocker ml(Compile_lock);
     if (log() != NULL) {
       // Log the dependencies which this compilation declares.
       dependencies()->log_all_dependencies();
     }
     // Encode the dependencies now, so we can check them right away.
     dependencies()->encode_content_bytes();
     // Check for {class loads, evolution, breakpoints} during compilation
     check_for_system_dictionary_modification(target);
     methodHandle method(THREAD, target->get_methodOop());
     if (failing()) {
       // While not a true deoptimization, it is a preemptive decompile.
       methodDataOop mdo = method()->method_data();
       if (mdo != NULL) {
         mdo->inc_decompile_count();
       }
       // All buffers in the CodeBuffer are allocated in the CodeCache.
       // If the code buffer is created on each compile attempt
       // as in C2, then it must be freed.
       code_buffer->free_blob();
       return;
     }
     assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
     assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
     nm =  nmethod::new_nmethod(method,
                                compile_id(),
                                entry_bci,
                                offsets,
                                orig_pc_offset,
                                debug_info(), dependencies(), code_buffer,
                                frame_words, oop_map_set,
                                handler_table, inc_table,
                                compiler, comp_level);
     // Free codeBlobs
     code_buffer->free_blob();
     // stress test 6243940 by immediately making the method
     // non-entrant behind the system's back. This has serious
     // side effects on the code cache and is not meant for
     // general stress testing
     if (nm != NULL && StressNonEntrant) {
       MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
       NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),
                   SharedRuntime::get_handle_wrong_method_stub());
     }
     if (nm == NULL) {
       // The CodeCache is full.  Print out warning and disable compilation.
       record_failure("code cache is full");
       UseInterpreter = true;
       if (UseCompiler || AlwaysCompileLoopMethods ) {
 #ifndef PRODUCT
         warning("CodeCache is full. Compiler has been disabled");
         if (CompileTheWorld || ExitOnFullCodeCache) {
           before_exit(JavaThread::current());
           exit_globals(); // will delete tty
           vm_direct_exit(CompileTheWorld ? 0 : 1);
         }
 #endif
         UseCompiler               = false;
         AlwaysCompileLoopMethods  = false;
       }
     } else {
       NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); )
       nm->set_has_unsafe_access(has_unsafe_access);
       // Record successful registration.
       // (Put nm into the task handle *before* publishing to the Java heap.)
       if (task() != NULL)  task()->set_code(nm);
       if (entry_bci == InvocationEntryBci) {
 #ifdef TIERED
         // If there is an old version we're done with it
         nmethod* old = method->code();
         if (TraceMethodReplacement && old != NULL) {
           ResourceMark rm;
           char *method_name = method->name_and_sig_as_C_string();
           tty->print_cr("Replacing method %s", method_name);
         }
         if (old != NULL ) {
           old->make_not_entrant();
         }
 #endif // TIERED
         if (TraceNMethodInstalls ) {
           ResourceMark rm;
           char *method_name = method->name_and_sig_as_C_string();
           ttyLocker ttyl;
           tty->print_cr("Installing method (%d) %s ",
                         comp_level,
                         method_name);
         }
         // Allow the code to be executed
         method->set_code(method, nm);
       } else {
         if (TraceNMethodInstalls ) {
           ResourceMark rm;
           char *method_name = method->name_and_sig_as_C_string();
           ttyLocker ttyl;
           tty->print_cr("Installing osr method (%d) %s @ %d",
                         comp_level,
                         method_name,
                         entry_bci);
         }
         instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);
       }
     }
   }
   // JVMTI -- compiled method notification (must be done outside lock)
   if (nm != NULL) {
     nm->post_compiled_method_load_event();
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::find_system_klass
 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
   VM_ENTRY_MARK;
   return get_klass_by_name_impl(NULL, klass_name, false);
 }
 // ------------------------------------------------------------------
 // ciEnv::comp_level
 int ciEnv::comp_level() {
   if (task() == NULL)  return CompLevel_full_optimization;
   return task()->comp_level();
 }
 // ------------------------------------------------------------------
 // ciEnv::compile_id
 uint ciEnv::compile_id() {
   if (task() == NULL)  return 0;
   return task()->compile_id();
 }
 // ------------------------------------------------------------------
 // ciEnv::notice_inlined_method()
 void ciEnv::notice_inlined_method(ciMethod* method) {
   _num_inlined_bytecodes += method->code_size();
 }
 // ------------------------------------------------------------------
 // ciEnv::num_inlined_bytecodes()
 int ciEnv::num_inlined_bytecodes() const {
   return _num_inlined_bytecodes;
 }
 // ------------------------------------------------------------------
 // ciEnv::record_failure()
 void ciEnv::record_failure(const char* reason) {
   if (log() != NULL) {
     log()->elem("failure reason='%s'", reason);
   }
   if (_failure_reason == NULL) {
     // Record the first failure reason.
     _failure_reason = reason;
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::record_method_not_compilable()
 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
   int new_compilable =
     all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
   // Only note transitions to a worse state
   if (new_compilable > _compilable) {
     if (log() != NULL) {
       if (all_tiers) {
         log()->elem("method_not_compilable");
       } else {
         log()->elem("method_not_compilable_at_tier");
       }
     }
     _compilable = new_compilable;
     // Reset failure reason; this one is more important.
     _failure_reason = NULL;
     record_failure(reason);
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::record_out_of_memory_failure()
 void ciEnv::record_out_of_memory_failure() {
   // If memory is low, we stop compiling methods.
   record_method_not_compilable("out of memory");
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/ci/ciEnv.cpp@6ca61c728c2d (annotated)

src/share/vm/ci/ciEnv.cpp