| /* |
| * Copyright (c) 1999, 2017, 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. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "ci/ciConstant.hpp" |
| #include "ci/ciField.hpp" |
| #include "ci/ciInstance.hpp" |
| #include "ci/ciInstanceKlass.hpp" |
| #include "ci/ciUtilities.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "oops/oop.inline.hpp" |
| |
| // ciInstance |
| // |
| // This class represents an instanceOop in the HotSpot virtual |
| // machine. |
| |
| // ------------------------------------------------------------------ |
| // ciObject::java_mirror_type |
| ciType* ciInstance::java_mirror_type() { |
| VM_ENTRY_MARK; |
| oop m = get_oop(); |
| // Return NULL if it is not java.lang.Class. |
| if (m == NULL || m->klass() != SystemDictionary::Class_klass()) { |
| return NULL; |
| } |
| // Return either a primitive type or a klass. |
| if (java_lang_Class::is_primitive(m)) { |
| return ciType::make(java_lang_Class::primitive_type(m)); |
| } else { |
| Klass* k = java_lang_Class::as_Klass(m); |
| assert(k != NULL, ""); |
| return CURRENT_THREAD_ENV->get_klass(k); |
| } |
| } |
| |
| // ------------------------------------------------------------------ |
| // ciInstance::field_value_impl |
| ciConstant ciInstance::field_value_impl(BasicType field_btype, int offset) { |
| oop obj = get_oop(); |
| assert(obj != NULL, "bad oop"); |
| switch(field_btype) { |
| case T_BYTE: return ciConstant(field_btype, obj->byte_field(offset)); |
| case T_CHAR: return ciConstant(field_btype, obj->char_field(offset)); |
| case T_SHORT: return ciConstant(field_btype, obj->short_field(offset)); |
| case T_BOOLEAN: return ciConstant(field_btype, obj->bool_field(offset)); |
| case T_INT: return ciConstant(field_btype, obj->int_field(offset)); |
| case T_FLOAT: return ciConstant(obj->float_field(offset)); |
| case T_DOUBLE: return ciConstant(obj->double_field(offset)); |
| case T_LONG: return ciConstant(obj->long_field(offset)); |
| case T_OBJECT: // fall through |
| case T_ARRAY: { |
| oop o = obj->obj_field(offset); |
| |
| // A field will be "constant" if it is known always to be |
| // a non-null reference to an instance of a particular class, |
| // or to a particular array. This can happen even if the instance |
| // or array is not perm. In such a case, an "unloaded" ciArray |
| // or ciInstance is created. The compiler may be able to use |
| // information about the object's class (which is exact) or length. |
| |
| if (o == NULL) { |
| return ciConstant(field_btype, ciNullObject::make()); |
| } else { |
| return ciConstant(field_btype, CURRENT_ENV->get_object(o)); |
| } |
| } |
| default: |
| fatal("no field value: %s", type2name(field_btype)); |
| return ciConstant(); |
| } |
| } |
| |
| // ------------------------------------------------------------------ |
| // ciInstance::field_value |
| // |
| // Constant value of a field. |
| ciConstant ciInstance::field_value(ciField* field) { |
| assert(is_loaded(), "invalid access - must be loaded"); |
| assert(field->holder()->is_loaded(), "invalid access - holder must be loaded"); |
| assert(field->is_static() || klass()->is_subclass_of(field->holder()), "invalid access - must be subclass"); |
| |
| GUARDED_VM_ENTRY(return field_value_impl(field->type()->basic_type(), field->offset());) |
| } |
| |
| // ------------------------------------------------------------------ |
| // ciInstance::field_value_by_offset |
| // |
| // Constant value of a field at the specified offset. |
| ciConstant ciInstance::field_value_by_offset(int field_offset) { |
| ciInstanceKlass* ik = klass()->as_instance_klass(); |
| ciField* field = ik->get_field_by_offset(field_offset, false); |
| if (field == NULL) |
| return ciConstant(); // T_ILLEGAL |
| return field_value(field); |
| } |
| |
| // ------------------------------------------------------------------ |
| // ciInstance::print_impl |
| // |
| // Implementation of the print method. |
| void ciInstance::print_impl(outputStream* st) { |
| st->print(" type="); |
| klass()->print(st); |
| } |
| |
| |
| ciKlass* ciInstance::java_lang_Class_klass() { |
| VM_ENTRY_MARK; |
| return CURRENT_ENV->get_metadata(java_lang_Class::as_Klass(get_oop()))->as_klass(); |
| } |