jdk8-mips64-public/hotspot: src/share/vm/ci/ciInstanceKlass.cpp@b4776199210f (annotated)

src/share/vm/ci/ciInstanceKlass.cpp@b4776199210f (annotated)

src/share/vm/ci/ciInstanceKlass.cpp

Mon, 26 Apr 2010 23:59:45 -0700

author: never
date: Mon, 26 Apr 2010 23:59:45 -0700
changeset 1832: b4776199210f
parent 1577: 4ce7240d622c
child 1907: c18cbe5936b8
permissions: -rw-r--r--

6943485: JVMTI always on capabilities change code generation too much
Reviewed-by: twisti, dcubed

 /*
  * Copyright 1999-2008 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/_ciInstanceKlass.cpp.incl"
 // ciInstanceKlass
 //
 // This class represents a klassOop in the HotSpot virtual machine
 // whose Klass part in an instanceKlass.
 // ------------------------------------------------------------------
 // ciInstanceKlass::ciInstanceKlass
 //
 // Loaded instance klass.
 ciInstanceKlass::ciInstanceKlass(KlassHandle h_k) :
   ciKlass(h_k), _non_static_fields(NULL)
 {
   assert(get_Klass()->oop_is_instance(), "wrong type");
   instanceKlass* ik = get_instanceKlass();
   AccessFlags access_flags = ik->access_flags();
   _flags = ciFlags(access_flags);
   _has_finalizer = access_flags.has_finalizer();
   _has_subklass = ik->subklass() != NULL;
   _is_initialized = ik->is_initialized();
   // Next line must follow and use the result of the previous line:
   _is_linked = _is_initialized || ik->is_linked();
   _nonstatic_field_size = ik->nonstatic_field_size();
   _has_nonstatic_fields = ik->has_nonstatic_fields();
   _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields:
   _nof_implementors = ik->nof_implementors();
   for (int i = 0; i < implementors_limit; i++) {
     _implementors[i] = NULL;  // we will fill these lazily
   }
   Thread *thread = Thread::current();
   if (ciObjectFactory::is_initialized()) {
     _loader = JNIHandles::make_local(thread, ik->class_loader());
     _protection_domain = JNIHandles::make_local(thread,
                                                 ik->protection_domain());
     _is_shared = false;
   } else {
     Handle h_loader(thread, ik->class_loader());
     Handle h_protection_domain(thread, ik->protection_domain());
     _loader = JNIHandles::make_global(h_loader);
     _protection_domain = JNIHandles::make_global(h_protection_domain);
     _is_shared = true;
   }
   // Lazy fields get filled in only upon request.
   _super  = NULL;
   _java_mirror = NULL;
   if (is_shared()) {
     if (h_k() != SystemDictionary::Object_klass()) {
       super();
     }
     java_mirror();
     //compute_nonstatic_fields();  // done outside of constructor
   }
   _field_cache = NULL;
 }
 // Version for unloaded classes:
 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
                                  jobject loader, jobject protection_domain)
   : ciKlass(name, ciInstanceKlassKlass::make())
 {
   assert(name->byte_at(0) != '[', "not an instance klass");
   _is_initialized = false;
   _is_linked = false;
   _nonstatic_field_size = -1;
   _has_nonstatic_fields = false;
   _nonstatic_fields = NULL;
   _nof_implementors = -1;
   _loader = loader;
   _protection_domain = protection_domain;
   _is_shared = false;
   _super = NULL;
   _java_mirror = NULL;
   _field_cache = NULL;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::compute_shared_is_initialized
 bool ciInstanceKlass::compute_shared_is_initialized() {
   GUARDED_VM_ENTRY(
     instanceKlass* ik = get_instanceKlass();
     _is_initialized = ik->is_initialized();
     return _is_initialized;
   )
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::compute_shared_is_linked
 bool ciInstanceKlass::compute_shared_is_linked() {
   GUARDED_VM_ENTRY(
     instanceKlass* ik = get_instanceKlass();
     _is_linked = ik->is_linked();
     return _is_linked;
   )
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::compute_shared_has_subklass
 bool ciInstanceKlass::compute_shared_has_subklass() {
   GUARDED_VM_ENTRY(
     instanceKlass* ik = get_instanceKlass();
     _has_subklass = ik->subklass() != NULL;
     return _has_subklass;
   )
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::compute_shared_nof_implementors
 int ciInstanceKlass::compute_shared_nof_implementors() {
   // We requery this property, since it is a very old ciObject.
   GUARDED_VM_ENTRY(
     instanceKlass* ik = get_instanceKlass();
     _nof_implementors = ik->nof_implementors();
     return _nof_implementors;
   )
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::loader
 oop ciInstanceKlass::loader() {
   ASSERT_IN_VM;
   return JNIHandles::resolve(_loader);
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::loader_handle
 jobject ciInstanceKlass::loader_handle() {
   return _loader;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::protection_domain
 oop ciInstanceKlass::protection_domain() {
   ASSERT_IN_VM;
   return JNIHandles::resolve(_protection_domain);
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::protection_domain_handle
 jobject ciInstanceKlass::protection_domain_handle() {
   return _protection_domain;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::field_cache
 //
 // Get the field cache associated with this klass.
 ciConstantPoolCache* ciInstanceKlass::field_cache() {
   if (is_shared()) {
     return NULL;
   }
   if (_field_cache == NULL) {
     assert(!is_java_lang_Object(), "Object has no fields");
     Arena* arena = CURRENT_ENV->arena();
     _field_cache = new (arena) ciConstantPoolCache(arena, 5);
   }
   return _field_cache;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::get_canonical_holder
 //
 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
   #ifdef ASSERT
   if (!(offset >= 0 && offset < layout_helper())) {
     tty->print("*** get_canonical_holder(%d) on ", offset);
     this->print();
     tty->print_cr(" ***");
   };
   assert(offset >= 0 && offset < layout_helper(), "offset must be tame");
   #endif
   if (offset < instanceOopDesc::base_offset_in_bytes()) {
     // All header offsets belong properly to java/lang/Object.
     return CURRENT_ENV->Object_klass();
   }
   ciInstanceKlass* self = this;
   for (;;) {
     assert(self->is_loaded(), "must be loaded to have size");
     ciInstanceKlass* super = self->super();
     if (super == NULL || super->nof_nonstatic_fields() == 0 ||
         !super->contains_field_offset(offset)) {
       return self;
     } else {
       self = super;  // return super->get_canonical_holder(offset)
     }
   }
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::is_java_lang_Object
 //
 // Is this klass java.lang.Object?
 bool ciInstanceKlass::is_java_lang_Object() {
   return equals(CURRENT_ENV->Object_klass());
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::uses_default_loader
 bool ciInstanceKlass::uses_default_loader() {
   // Note:  We do not need to resolve the handle or enter the VM
   // in order to test null-ness.
   return _loader == NULL;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::is_in_package
 //
 // Is this klass in the given package?
 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
   // To avoid class loader mischief, this test always rejects application classes.
   if (!uses_default_loader())
     return false;
   GUARDED_VM_ENTRY(
     return is_in_package_impl(packagename, len);
   )
 }
 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
   ASSERT_IN_VM;
   // If packagename contains trailing '/' exclude it from the
   // prefix-test since we test for it explicitly.
   if (packagename[len - 1] == '/')
     len--;
   if (!name()->starts_with(packagename, len))
     return false;
   // Test if the class name is something like "java/lang".
   if ((len + 1) > name()->utf8_length())
     return false;
   // Test for trailing '/'
   if ((char) name()->byte_at(len) != '/')
     return false;
   // Make sure it's not actually in a subpackage:
   if (name()->index_of_at(len+1, "/", 1) >= 0)
     return false;
   return true;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::print_impl
 //
 // Implementation of the print method.
 void ciInstanceKlass::print_impl(outputStream* st) {
   ciKlass::print_impl(st);
   GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());)
   if (is_loaded()) {
     st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
               bool_to_str(is_initialized()),
               bool_to_str(has_finalizer()),
               bool_to_str(has_subklass()),
               layout_helper());
     _flags.print_klass_flags();
     if (_super) {
       st->print(" super=");
       _super->print_name();
     }
     if (_java_mirror) {
       st->print(" mirror=PRESENT");
     }
   } else {
     st->print(" loaded=false");
   }
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::super
 //
 // Get the superklass of this klass.
 ciInstanceKlass* ciInstanceKlass::super() {
   assert(is_loaded(), "must be loaded");
   if (_super == NULL && !is_java_lang_Object()) {
     GUARDED_VM_ENTRY(
       klassOop super_klass = get_instanceKlass()->super();
       _super = CURRENT_ENV->get_object(super_klass)->as_instance_klass();
     )
   }
   return _super;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::java_mirror
 //
 // Get the instance of java.lang.Class corresponding to this klass.
 ciInstance* ciInstanceKlass::java_mirror() {
   assert(is_loaded(), "must be loaded");
   if (_java_mirror == NULL) {
     _java_mirror = ciKlass::java_mirror();
   }
   return _java_mirror;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::unique_concrete_subklass
 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
   if (!is_loaded())     return NULL; // No change if class is not loaded
   if (!is_abstract())   return NULL; // Only applies to abstract classes.
   if (!has_subklass())  return NULL; // Must have at least one subklass.
   VM_ENTRY_MARK;
   instanceKlass* ik = get_instanceKlass();
   Klass* up = ik->up_cast_abstract();
   assert(up->oop_is_instance(), "must be instanceKlass");
   if (ik == up) {
     return NULL;
   }
   return CURRENT_THREAD_ENV->get_object(up->as_klassOop())->as_instance_klass();
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::has_finalizable_subclass
 bool ciInstanceKlass::has_finalizable_subclass() {
   if (!is_loaded())     return true;
   VM_ENTRY_MARK;
   return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::get_field_by_offset
 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
   if (!is_static) {
     for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
       ciField* field = _nonstatic_fields->at(i);
       int  field_off = field->offset_in_bytes();
       if (field_off == field_offset)
         return field;
       if (field_off > field_offset)
         break;
       // could do binary search or check bins, but probably not worth it
     }
     return NULL;
   }
   VM_ENTRY_MARK;
   instanceKlass* k = get_instanceKlass();
   fieldDescriptor fd;
   if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
     return NULL;
   }
   ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
   return field;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::get_field_by_name
 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
   VM_ENTRY_MARK;
   instanceKlass* k = get_instanceKlass();
   fieldDescriptor fd;
   klassOop def = k->find_field(name->get_symbolOop(), signature->get_symbolOop(), is_static, &fd);
   if (def == NULL) {
     return NULL;
   }
   ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
   return field;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::non_static_fields.
 class NonStaticFieldFiller: public FieldClosure {
   GrowableArray<ciField*>* _arr;
   ciEnv* _curEnv;
 public:
   NonStaticFieldFiller(ciEnv* curEnv, GrowableArray<ciField*>* arr) :
     _curEnv(curEnv), _arr(arr)
   {}
   void do_field(fieldDescriptor* fd) {
     ciField* field = new (_curEnv->arena()) ciField(fd);
     _arr->append(field);
   }
 };
 GrowableArray<ciField*>* ciInstanceKlass::non_static_fields() {
   if (_non_static_fields == NULL) {
     VM_ENTRY_MARK;
     ciEnv* curEnv = ciEnv::current();
     instanceKlass* ik = get_instanceKlass();
     int max_n_fields = ik->fields()->length()/instanceKlass::next_offset;
     _non_static_fields =
       new (curEnv->arena()) GrowableArray<ciField*>(max_n_fields);
     NonStaticFieldFiller filler(curEnv, _non_static_fields);
     ik->do_nonstatic_fields(&filler);
   }
   return _non_static_fields;
 }
 static int sort_field_by_offset(ciField** a, ciField** b) {
   return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
   // (no worries about 32-bit overflow...)
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::compute_nonstatic_fields
 int ciInstanceKlass::compute_nonstatic_fields() {
   assert(is_loaded(), "must be loaded");
   if (_nonstatic_fields != NULL)
     return _nonstatic_fields->length();
   if (!has_nonstatic_fields()) {
     Arena* arena = CURRENT_ENV->arena();
     _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
     return 0;
   }
   assert(!is_java_lang_Object(), "bootstrap OK");
   // Size in bytes of my fields, including inherited fields.
   int fsize = nonstatic_field_size() * heapOopSize;
   ciInstanceKlass* super = this->super();
   GrowableArray<ciField*>* super_fields = NULL;
   if (super != NULL && super->has_nonstatic_fields()) {
     int super_fsize  = super->nonstatic_field_size() * heapOopSize;
     int super_flen   = super->nof_nonstatic_fields();
     super_fields = super->_nonstatic_fields;
     assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
     // See if I am no larger than my super; if so, I can use his fields.
     if (fsize == super_fsize) {
       _nonstatic_fields = super_fields;
       return super_fields->length();
     }
   }
   GrowableArray<ciField*>* fields = NULL;
   GUARDED_VM_ENTRY({
       fields = compute_nonstatic_fields_impl(super_fields);
     });
   if (fields == NULL) {
     // This can happen if this class (java.lang.Class) has invisible fields.
     _nonstatic_fields = super_fields;
     return super_fields->length();
   }
   int flen = fields->length();
   // Now sort them by offset, ascending.
   // (In principle, they could mix with superclass fields.)
   fields->sort(sort_field_by_offset);
 #ifdef ASSERT
   int last_offset = instanceOopDesc::base_offset_in_bytes();
   for (int i = 0; i < fields->length(); i++) {
     ciField* field = fields->at(i);
     int offset = field->offset_in_bytes();
     int size   = (field->_type == NULL) ? heapOopSize : field->size_in_bytes();
     assert(last_offset <= offset, "no field overlap");
     if (last_offset > (int)sizeof(oopDesc))
       assert((offset - last_offset) < BytesPerLong, "no big holes");
     // Note:  Two consecutive T_BYTE fields will be separated by wordSize-1
     // padding bytes if one of them is declared by a superclass.
     // This is a minor inefficiency classFileParser.cpp.
     last_offset = offset + size;
   }
   assert(last_offset <= (int)instanceOopDesc::base_offset_in_bytes() + fsize, "no overflow");
 #endif
   _nonstatic_fields = fields;
   return flen;
 }
 GrowableArray<ciField*>*
 ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>*
                                                super_fields) {
   ASSERT_IN_VM;
   Arena* arena = CURRENT_ENV->arena();
   int flen = 0;
   GrowableArray<ciField*>* fields = NULL;
   instanceKlass* k = get_instanceKlass();
   typeArrayOop fields_array = k->fields();
   for (int pass = 0; pass <= 1; pass++) {
     for (int i = 0, alen = fields_array->length(); i < alen; i += instanceKlass::next_offset) {
       fieldDescriptor fd;
       fd.initialize(k->as_klassOop(), i);
       if (fd.is_static())  continue;
       if (pass == 0) {
         flen += 1;
       } else {
         ciField* field = new (arena) ciField(&fd);
         fields->append(field);
       }
     }
     // Between passes, allocate the array:
     if (pass == 0) {
       if (flen == 0) {
         return NULL;  // return nothing if none are locally declared
       }
       if (super_fields != NULL) {
         flen += super_fields->length();
       }
       fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
       if (super_fields != NULL) {
         fields->appendAll(super_fields);
       }
     }
   }
   assert(fields->length() == flen, "sanity");
   return fields;
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::find_method
 //
 // Find a method in this klass.
 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
   VM_ENTRY_MARK;
   instanceKlass* k = get_instanceKlass();
   symbolOop name_sym = name->get_symbolOop();
   symbolOop sig_sym= signature->get_symbolOop();
   methodOop m = k->find_method(name_sym, sig_sym);
   if (m == NULL)  return NULL;
   return CURRENT_THREAD_ENV->get_object(m)->as_method();
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::is_leaf_type
 bool ciInstanceKlass::is_leaf_type() {
   assert(is_loaded(), "must be loaded");
   if (is_shared()) {
     return is_final();  // approximately correct
   } else {
     return !_has_subklass && (_nof_implementors == 0);
   }
 }
 // ------------------------------------------------------------------
 // ciInstanceKlass::implementor
 //
 // Report an implementor of this interface.
 // Returns NULL if exact information is not available.
 // Note that there are various races here, since my copy
 // of _nof_implementors might be out of date with respect
 // to results returned by instanceKlass::implementor.
 // This is OK, since any dependencies we decide to assert
 // will be checked later under the Compile_lock.
 ciInstanceKlass* ciInstanceKlass::implementor(int n) {
   if (n > implementors_limit) {
     return NULL;
   }
   ciInstanceKlass* impl = _implementors[n];
   if (impl == NULL) {
     if (_nof_implementors > implementors_limit) {
       return NULL;
     }
     // Go into the VM to fetch the implementor.
     {
       VM_ENTRY_MARK;
       klassOop k = get_instanceKlass()->implementor(n);
       if (k != NULL) {
         impl = CURRENT_THREAD_ENV->get_object(k)->as_instance_klass();
       }
     }
     // Memoize this result.
     if (!is_shared()) {
       _implementors[n] = (impl == NULL)? this: impl;
     }
   } else if (impl == this) {
     impl = NULL;  // memoized null result from a VM query
   }
   return impl;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/ci/ciInstanceKlass.cpp@b4776199210f (annotated)

src/share/vm/ci/ciInstanceKlass.cpp