/* * Copyright (c) 1999, 2019, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. *
*/
// ciArray // // This class represents an arrayOop in the HotSpot virtual // machine. static BasicType fixup_element_type(BasicType bt) { if (is_reference_type(bt)) return T_OBJECT; if (bt == T_BOOLEAN) return T_BYTE; return bt;
}
ciConstant ciArray::element_value_impl(BasicType elembt,
arrayOop ary, int index) { if (ary == NULL) return ciConstant();
assert(ary->is_array(), ""); if (index < 0 || index >= ary->length()) return ciConstant();
ArrayKlass* ak = (ArrayKlass*) ary->klass();
BasicType abt = ak->element_type(); if (fixup_element_type(elembt) !=
fixup_element_type(abt)) return ciConstant(); switch (elembt) { case T_ARRAY: case T_OBJECT:
{
assert(ary->is_objArray(), "");
objArrayOop objary = (objArrayOop) ary;
oop elem = objary->obj_at(index);
ciEnv* env = CURRENT_ENV;
ciObject* box = env->get_object(elem); return ciConstant(T_OBJECT, box);
} default: break;
}
assert(ary->is_typeArray(), "");
typeArrayOop tary = (typeArrayOop) ary;
jint value = 0; switch (elembt) { case T_LONG: return ciConstant(tary->long_at(index)); case T_FLOAT: return ciConstant(tary->float_at(index)); case T_DOUBLE: return ciConstant(tary->double_at(index)); default: return ciConstant(); case T_BYTE: value = tary->byte_at(index); break; case T_BOOLEAN: value = tary->byte_at(index) & 1; break; case T_SHORT: value = tary->short_at(index); break; case T_CHAR: value = tary->char_at(index); break; case T_INT: value = tary->int_at(index); break;
} return ciConstant(elembt, value);
}
// ------------------------------------------------------------------ // ciArray::element_value // // Current value of an element. // Returns T_ILLEGAL if there is no element at the given index.
ciConstant ciArray::element_value(int index) {
BasicType elembt = element_basic_type();
GUARDED_VM_ENTRY( return element_value_impl(elembt, get_arrayOop(), index);
)
}
// ------------------------------------------------------------------ // ciArray::element_value_by_offset // // Current value of an element at the specified offset. // Returns T_ILLEGAL if there is no element at the given offset.
ciConstant ciArray::element_value_by_offset(intptr_t element_offset) {
BasicType elembt = element_basic_type();
intptr_t shift = exact_log2(type2aelembytes(elembt));
intptr_t header = arrayOopDesc::base_offset_in_bytes(elembt);
intptr_t index = (element_offset - header) >> shift;
intptr_t offset = header + ((intptr_t)index << shift); if (offset != element_offset || index != (jint)index || index < 0 || index >= length()) { return ciConstant();
} return element_value((jint) index);
}
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