ciArrayKlass.cpp

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.
 *
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 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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#include "precompiled.hpp"
#include "ci/ciArrayKlass.hpp"
#include "ci/ciFlatArrayKlass.hpp"
#include "ci/ciInlineKlass.hpp"
#include "ci/ciObjArrayKlass.hpp"
#include "ci/ciTypeArrayKlass.hpp"
#include "ci/ciUtilities.hpp"
#include "ci/ciUtilities.inline.hpp"
#include "oops/inlineKlass.inline.hpp"

// ciArrayKlass
//
// This class represents a Klass* in the HotSpot virtual machine
// whose Klass part in an ArrayKlass.

// ------------------------------------------------------------------
// ciArrayKlass::ciArrayKlass
//
// Loaded array klass.
ciArrayKlass::ciArrayKlass(Klass* k) : ciKlass(k) {
  assert(get_Klass()->is_array_klass(), "wrong type");
  _dimension = get_ArrayKlass()->dimension();
}

// ------------------------------------------------------------------
// ciArrayKlass::ciArrayKlass
//
// Unloaded array klass.
ciArrayKlass::ciArrayKlass(ciSymbol* name, int dimension, BasicType bt)
  : ciKlass(name, bt) {
  _dimension = dimension;
}

// ------------------------------------------------------------------
// ciArrayKlass::element_type
//
// What type is obtained when this array is indexed once?
ciType* ciArrayKlass::element_type() {
  if (is_type_array_klass()) {
    return ciType::make(as_type_array_klass()->element_type());
  } else {
    return element_klass()->as_klass();
  }
}


// ------------------------------------------------------------------
// ciArrayKlass::base_element_type
//
// What type is obtained when this array is indexed as many times as possible?
ciType* ciArrayKlass::base_element_type() {
  if (is_type_array_klass()) {
    return ciType::make(as_type_array_klass()->element_type());
  } else if (is_obj_array_klass()) {
    ciKlass* ek = as_obj_array_klass()->base_element_klass();
    if (ek->is_type_array_klass()) {
      return ciType::make(ek->as_type_array_klass()->element_type());
    }
    return ek;
  } else {
    return as_flat_array_klass()->base_element_klass();
  }
}


// ------------------------------------------------------------------
// ciArrayKlass::is_leaf_type
bool ciArrayKlass::is_leaf_type() {
  if (is_type_array_klass()) {
    return true;
  } else {
    return as_obj_array_klass()->base_element_klass()->is_leaf_type();
  }
}


// ------------------------------------------------------------------
// ciArrayKlass::base_element_type
//
// What type is obtained when this array is indexed as many times as possible?
ciArrayKlass* ciArrayKlass::make(ciType* element_type) {
  if (element_type->is_primitive_type()) {
    return ciTypeArrayKlass::make(element_type->basic_type());
  } else {
    return make(element_type->as_klass(), element_type->is_null_free());
  }
}

ciArrayKlass* ciArrayKlass::make(ciKlass* klass, bool null_free) {
  if (null_free) {
    if (klass->is_loaded()) {
      bool is_array_flattened = false;
      GUARDED_VM_ENTRY(
        EXCEPTION_CONTEXT;
        Klass* ak = InlineKlass::cast(klass->get_Klass())->null_free_inline_array_klass(THREAD);
        if (HAS_PENDING_EXCEPTION) {
          CLEAR_PENDING_EXCEPTION;
        } else {
          if (ak != NULL && ak->is_flatArray_klass()) {
            is_array_flattened = true;
          }
        }
      )
      if (is_array_flattened) {
        return ciFlatArrayKlass::make(klass);
      } else {
        return ciObjArrayKlass::make(klass, true);
      }
    } else {
      return ciEnv::unloaded_ciobjarrayklass();
    }
  } else {
    return ciObjArrayKlass::make(klass);
  }
}

int ciArrayKlass::array_header_in_bytes() {
  return get_ArrayKlass()->array_header_in_bytes();
}

ciInstance* ciArrayKlass::component_mirror_instance() const {
  GUARDED_VM_ENTRY(
    oop component_mirror = ArrayKlass::cast(get_Klass())->component_mirror();
    return CURRENT_ENV->get_instance(component_mirror);
  )
}