1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/ci/ciInstance.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,148 @@
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/ciConstant.hpp"
1.30 +#include "ci/ciField.hpp"
1.31 +#include "ci/ciInstance.hpp"
1.32 +#include "ci/ciInstanceKlass.hpp"
1.33 +#include "ci/ciUtilities.hpp"
1.34 +#include "classfile/systemDictionary.hpp"
1.35 +#include "oops/oop.inline.hpp"
1.36 +
1.37 +// ciInstance
1.38 +//
1.39 +// This class represents an instanceOop in the HotSpot virtual
1.40 +// machine.
1.41 +
1.42 +// ------------------------------------------------------------------
1.43 +// ciObject::java_mirror_type
1.44 +ciType* ciInstance::java_mirror_type() {
1.45 + VM_ENTRY_MARK;
1.46 + oop m = get_oop();
1.47 + // Return NULL if it is not java.lang.Class.
1.48 + if (m == NULL || m->klass() != SystemDictionary::Class_klass()) {
1.49 + return NULL;
1.50 + }
1.51 + // Return either a primitive type or a klass.
1.52 + if (java_lang_Class::is_primitive(m)) {
1.53 + return ciType::make(java_lang_Class::primitive_type(m));
1.54 + } else {
1.55 + Klass* k = java_lang_Class::as_Klass(m);
1.56 + assert(k != NULL, "");
1.57 + return CURRENT_THREAD_ENV->get_klass(k);
1.58 + }
1.59 +}
1.60 +
1.61 +// ------------------------------------------------------------------
1.62 +// ciInstance::field_value
1.63 +//
1.64 +// Constant value of a field.
1.65 +ciConstant ciInstance::field_value(ciField* field) {
1.66 + assert(is_loaded(), "invalid access - must be loaded");
1.67 + assert(field->holder()->is_loaded(), "invalid access - holder must be loaded");
1.68 + assert(klass()->is_subclass_of(field->holder()), "invalid access - must be subclass");
1.69 +
1.70 + VM_ENTRY_MARK;
1.71 + ciConstant result;
1.72 + Handle obj = get_oop();
1.73 + assert(!obj.is_null(), "bad oop");
1.74 + BasicType field_btype = field->type()->basic_type();
1.75 + int offset = field->offset();
1.76 +
1.77 + switch(field_btype) {
1.78 + case T_BYTE:
1.79 + return ciConstant(field_btype, obj->byte_field(offset));
1.80 + break;
1.81 + case T_CHAR:
1.82 + return ciConstant(field_btype, obj->char_field(offset));
1.83 + break;
1.84 + case T_SHORT:
1.85 + return ciConstant(field_btype, obj->short_field(offset));
1.86 + break;
1.87 + case T_BOOLEAN:
1.88 + return ciConstant(field_btype, obj->bool_field(offset));
1.89 + break;
1.90 + case T_INT:
1.91 + return ciConstant(field_btype, obj->int_field(offset));
1.92 + break;
1.93 + case T_FLOAT:
1.94 + return ciConstant(obj->float_field(offset));
1.95 + break;
1.96 + case T_DOUBLE:
1.97 + return ciConstant(obj->double_field(offset));
1.98 + break;
1.99 + case T_LONG:
1.100 + return ciConstant(obj->long_field(offset));
1.101 + break;
1.102 + case T_OBJECT:
1.103 + case T_ARRAY:
1.104 + {
1.105 + oop o = obj->obj_field(offset);
1.106 +
1.107 + // A field will be "constant" if it is known always to be
1.108 + // a non-null reference to an instance of a particular class,
1.109 + // or to a particular array. This can happen even if the instance
1.110 + // or array is not perm. In such a case, an "unloaded" ciArray
1.111 + // or ciInstance is created. The compiler may be able to use
1.112 + // information about the object's class (which is exact) or length.
1.113 +
1.114 + if (o == NULL) {
1.115 + return ciConstant(field_btype, ciNullObject::make());
1.116 + } else {
1.117 + return ciConstant(field_btype, CURRENT_ENV->get_object(o));
1.118 + }
1.119 + }
1.120 + }
1.121 + ShouldNotReachHere();
1.122 + // to shut up the compiler
1.123 + return ciConstant();
1.124 +}
1.125 +
1.126 +// ------------------------------------------------------------------
1.127 +// ciInstance::field_value_by_offset
1.128 +//
1.129 +// Constant value of a field at the specified offset.
1.130 +ciConstant ciInstance::field_value_by_offset(int field_offset) {
1.131 + ciInstanceKlass* ik = klass()->as_instance_klass();
1.132 + ciField* field = ik->get_field_by_offset(field_offset, false);
1.133 + if (field == NULL)
1.134 + return ciConstant(); // T_ILLEGAL
1.135 + return field_value(field);
1.136 +}
1.137 +
1.138 +// ------------------------------------------------------------------
1.139 +// ciInstance::print_impl
1.140 +//
1.141 +// Implementation of the print method.
1.142 +void ciInstance::print_impl(outputStream* st) {
1.143 + st->print(" type=");
1.144 + klass()->print(st);
1.145 +}
1.146 +
1.147 +
1.148 +ciKlass* ciInstance::java_lang_Class_klass() {
1.149 + VM_ENTRY_MARK;
1.150 + return CURRENT_ENV->get_metadata(java_lang_Class::as_Klass(get_oop()))->as_klass();
1.151 +}
