aoqi@0: /*
aoqi@0:  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "ci/ciArray.hpp"
aoqi@0: #include "ci/ciArrayKlass.hpp"
aoqi@0: #include "ci/ciConstant.hpp"
aoqi@0: #include "ci/ciKlass.hpp"
aoqi@0: #include "ci/ciUtilities.hpp"
aoqi@0: #include "oops/objArrayOop.hpp"
aoqi@0: #include "oops/typeArrayOop.hpp"
aoqi@0: 
aoqi@0: // ciArray
aoqi@0: //
aoqi@0: // This class represents an arrayOop in the HotSpot virtual
aoqi@0: // machine.
aoqi@0: static BasicType fixup_element_type(BasicType bt) {
aoqi@0:   if (bt == T_ARRAY)    return T_OBJECT;
aoqi@0:   if (bt == T_BOOLEAN)  return T_BYTE;
aoqi@0:   return bt;
aoqi@0: }
aoqi@0: 
aoqi@0: ciConstant ciArray::element_value_impl(BasicType elembt,
aoqi@0:                                        arrayOop ary,
aoqi@0:                                        int index) {
aoqi@0:   if (ary == NULL)
aoqi@0:     return ciConstant();
aoqi@0:   assert(ary->is_array(), "");
aoqi@0:   if (index < 0 || index >= ary->length())
aoqi@0:     return ciConstant();
aoqi@0:   ArrayKlass* ak = (ArrayKlass*) ary->klass();
aoqi@0:   BasicType abt = ak->element_type();
aoqi@0:   if (fixup_element_type(elembt) !=
aoqi@0:       fixup_element_type(abt))
aoqi@0:     return ciConstant();
aoqi@0:   switch (elembt) {
aoqi@0:   case T_ARRAY:
aoqi@0:   case T_OBJECT:
aoqi@0:     {
aoqi@0:       assert(ary->is_objArray(), "");
aoqi@0:       objArrayOop objary = (objArrayOop) ary;
aoqi@0:       oop elem = objary->obj_at(index);
aoqi@0:       ciEnv* env = CURRENT_ENV;
aoqi@0:       ciObject* box = env->get_object(elem);
aoqi@0:       return ciConstant(T_OBJECT, box);
aoqi@0:     }
aoqi@0:   }
aoqi@0:   assert(ary->is_typeArray(), "");
aoqi@0:   typeArrayOop tary = (typeArrayOop) ary;
aoqi@0:   jint value = 0;
aoqi@0:   switch (elembt) {
aoqi@0:   case T_LONG:          return ciConstant(tary->long_at(index));
aoqi@0:   case T_FLOAT:         return ciConstant(tary->float_at(index));
aoqi@0:   case T_DOUBLE:        return ciConstant(tary->double_at(index));
aoqi@0:   default:              return ciConstant();
aoqi@0:   case T_BYTE:          value = tary->byte_at(index);           break;
aoqi@0:   case T_BOOLEAN:       value = tary->byte_at(index) & 1;       break;
aoqi@0:   case T_SHORT:         value = tary->short_at(index);          break;
aoqi@0:   case T_CHAR:          value = tary->char_at(index);           break;
aoqi@0:   case T_INT:           value = tary->int_at(index);            break;
aoqi@0:   }
aoqi@0:   return ciConstant(elembt, value);
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciArray::element_value
aoqi@0: //
aoqi@0: // Current value of an element.
aoqi@0: // Returns T_ILLEGAL if there is no element at the given index.
aoqi@0: ciConstant ciArray::element_value(int index) {
aoqi@0:   BasicType elembt = element_basic_type();
aoqi@0:   GUARDED_VM_ENTRY(
aoqi@0:     return element_value_impl(elembt, get_arrayOop(), index);
aoqi@0:   )
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciArray::element_value_by_offset
aoqi@0: //
aoqi@0: // Current value of an element at the specified offset.
aoqi@0: // Returns T_ILLEGAL if there is no element at the given offset.
aoqi@0: ciConstant ciArray::element_value_by_offset(intptr_t element_offset) {
aoqi@0:   BasicType elembt = element_basic_type();
aoqi@0:   intptr_t shift  = exact_log2(type2aelembytes(elembt));
aoqi@0:   intptr_t header = arrayOopDesc::base_offset_in_bytes(elembt);
aoqi@0:   intptr_t index = (element_offset - header) >> shift;
aoqi@0:   intptr_t offset = header + ((intptr_t)index << shift);
aoqi@0:   if (offset != element_offset || index != (jint)index)
aoqi@0:     return ciConstant();
aoqi@0:   return element_value((jint) index);
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciArray::print_impl
aoqi@0: //
aoqi@0: // Implementation of the print method.
aoqi@0: void ciArray::print_impl(outputStream* st) {
aoqi@0:   st->print(" length=%d type=", length());
aoqi@0:   klass()->print(st);
aoqi@0: }