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