jdk

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/*
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 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "ci/ciArray.hpp"
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#include "ci/ciArrayKlass.hpp"
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#include "ci/ciConstant.hpp"
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#include "ci/ciKlass.hpp"
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#include "ci/ciUtilities.inline.hpp"
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#include "oops/objArrayOop.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/typeArrayOop.inline.hpp"
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#include "utilities/powerOfTwo.hpp"
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// ciArray
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//
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// This class represents an arrayOop in the HotSpot virtual
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// machine.
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static BasicType fixup_element_type(BasicType bt) {
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  if (is_reference_type(bt))  return T_OBJECT;
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  if (bt == T_BOOLEAN)  return T_BYTE;
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  return bt;
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}
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ciConstant ciArray::element_value_impl(BasicType elembt,
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                                       arrayOop ary,
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                                       int index) {
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  if (ary == nullptr)
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    return ciConstant();
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  assert(ary->is_array(), "");
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  if (index < 0 || index >= ary->length())
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    return ciConstant();
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  ArrayKlass* ak = (ArrayKlass*) ary->klass();
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  BasicType abt = ak->element_type();
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  if (fixup_element_type(elembt) !=
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      fixup_element_type(abt))
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    return ciConstant();
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  switch (elembt) {
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  case T_ARRAY:
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  case T_OBJECT:
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    {
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      assert(ary->is_objArray(), "");
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      objArrayOop objary = (objArrayOop) ary;
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      oop elem = objary->obj_at(index);
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      return ciConstant(elembt, CURRENT_ENV->get_object(elem));
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    }
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  default:
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    break;
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  }
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  assert(ary->is_typeArray(), "");
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  typeArrayOop tary = (typeArrayOop) ary;
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  jint value = 0;
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  switch (elembt) {
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  case T_LONG:          return ciConstant(tary->long_at(index));
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  case T_FLOAT:         return ciConstant(tary->float_at(index));
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  case T_DOUBLE:        return ciConstant(tary->double_at(index));
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  default:              return ciConstant();
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  case T_BYTE:          value = tary->byte_at(index);           break;
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  case T_BOOLEAN:       value = tary->byte_at(index) & 1;       break;
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  case T_SHORT:         value = tary->short_at(index);          break;
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  case T_CHAR:          value = tary->char_at(index);           break;
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  case T_INT:           value = tary->int_at(index);            break;
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  }
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  return ciConstant(elembt, value);
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}
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// ------------------------------------------------------------------
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// ciArray::element_value
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//
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// Current value of an element.
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// Returns T_ILLEGAL if there is no element at the given index.
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ciConstant ciArray::element_value(int index) {
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  BasicType elembt = element_basic_type();
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  ciConstant value = check_constant_value_cache(index, elembt);
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  if (value.is_valid()) {
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    return value;
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  }
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  GUARDED_VM_ENTRY(
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    value = element_value_impl(elembt, get_arrayOop(), index);
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  )
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  add_to_constant_value_cache(index, value);
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  return value;
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}
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// ------------------------------------------------------------------
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// ciArray::element_value_by_offset
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//
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// Current value of an element at the specified offset.
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// Returns T_ILLEGAL if there is no element at the given offset.
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ciConstant ciArray::element_value_by_offset(intptr_t element_offset) {
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  BasicType elembt = element_basic_type();
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  intptr_t shift  = exact_log2(type2aelembytes(elembt));
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  intptr_t header = arrayOopDesc::base_offset_in_bytes(elembt);
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  intptr_t index = (element_offset - header) >> shift;
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  intptr_t offset = header + ((intptr_t)index << shift);
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  if (offset != element_offset || index != (jint)index || index < 0 || index >= length()) {
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    return ciConstant();
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  }
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  return element_value((jint) index);
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}
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// ------------------------------------------------------------------
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// ciArray::print_impl
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//
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// Implementation of the print method.
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void ciArray::print_impl(outputStream* st) {
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  st->print(" length=%d type=", length());
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  klass()->print(st);
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}
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