1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/ci/ciArray.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,121 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "ci/ciArray.hpp"
1.30 +#include "ci/ciArrayKlass.hpp"
1.31 +#include "ci/ciConstant.hpp"
1.32 +#include "ci/ciKlass.hpp"
1.33 +#include "ci/ciUtilities.hpp"
1.34 +#include "oops/objArrayOop.hpp"
1.35 +#include "oops/typeArrayOop.hpp"
1.36 +
1.37 +// ciArray
1.38 +//
1.39 +// This class represents an arrayOop in the HotSpot virtual
1.40 +// machine.
1.41 +static BasicType fixup_element_type(BasicType bt) {
1.42 + if (bt == T_ARRAY) return T_OBJECT;
1.43 + if (bt == T_BOOLEAN) return T_BYTE;
1.44 + return bt;
1.45 +}
1.46 +
1.47 +ciConstant ciArray::element_value_impl(BasicType elembt,
1.48 + arrayOop ary,
1.49 + int index) {
1.50 + if (ary == NULL)
1.51 + return ciConstant();
1.52 + assert(ary->is_array(), "");
1.53 + if (index < 0 || index >= ary->length())
1.54 + return ciConstant();
1.55 + ArrayKlass* ak = (ArrayKlass*) ary->klass();
1.56 + BasicType abt = ak->element_type();
1.57 + if (fixup_element_type(elembt) !=
1.58 + fixup_element_type(abt))
1.59 + return ciConstant();
1.60 + switch (elembt) {
1.61 + case T_ARRAY:
1.62 + case T_OBJECT:
1.63 + {
1.64 + assert(ary->is_objArray(), "");
1.65 + objArrayOop objary = (objArrayOop) ary;
1.66 + oop elem = objary->obj_at(index);
1.67 + ciEnv* env = CURRENT_ENV;
1.68 + ciObject* box = env->get_object(elem);
1.69 + return ciConstant(T_OBJECT, box);
1.70 + }
1.71 + }
1.72 + assert(ary->is_typeArray(), "");
1.73 + typeArrayOop tary = (typeArrayOop) ary;
1.74 + jint value = 0;
1.75 + switch (elembt) {
1.76 + case T_LONG: return ciConstant(tary->long_at(index));
1.77 + case T_FLOAT: return ciConstant(tary->float_at(index));
1.78 + case T_DOUBLE: return ciConstant(tary->double_at(index));
1.79 + default: return ciConstant();
1.80 + case T_BYTE: value = tary->byte_at(index); break;
1.81 + case T_BOOLEAN: value = tary->byte_at(index) & 1; break;
1.82 + case T_SHORT: value = tary->short_at(index); break;
1.83 + case T_CHAR: value = tary->char_at(index); break;
1.84 + case T_INT: value = tary->int_at(index); break;
1.85 + }
1.86 + return ciConstant(elembt, value);
1.87 +}
1.88 +
1.89 +// ------------------------------------------------------------------
1.90 +// ciArray::element_value
1.91 +//
1.92 +// Current value of an element.
1.93 +// Returns T_ILLEGAL if there is no element at the given index.
1.94 +ciConstant ciArray::element_value(int index) {
1.95 + BasicType elembt = element_basic_type();
1.96 + GUARDED_VM_ENTRY(
1.97 + return element_value_impl(elembt, get_arrayOop(), index);
1.98 + )
1.99 +}
1.100 +
1.101 +// ------------------------------------------------------------------
1.102 +// ciArray::element_value_by_offset
1.103 +//
1.104 +// Current value of an element at the specified offset.
1.105 +// Returns T_ILLEGAL if there is no element at the given offset.
1.106 +ciConstant ciArray::element_value_by_offset(intptr_t element_offset) {
1.107 + BasicType elembt = element_basic_type();
1.108 + intptr_t shift = exact_log2(type2aelembytes(elembt));
1.109 + intptr_t header = arrayOopDesc::base_offset_in_bytes(elembt);
1.110 + intptr_t index = (element_offset - header) >> shift;
1.111 + intptr_t offset = header + ((intptr_t)index << shift);
1.112 + if (offset != element_offset || index != (jint)index)
1.113 + return ciConstant();
1.114 + return element_value((jint) index);
1.115 +}
1.116 +
1.117 +// ------------------------------------------------------------------
1.118 +// ciArray::print_impl
1.119 +//
1.120 +// Implementation of the print method.
1.121 +void ciArray::print_impl(outputStream* st) {
1.122 + st->print(" length=%d type=", length());
1.123 + klass()->print(st);
1.124 +}
