/* * Copyright (c) 1999, 2021, 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. *
*/
// 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() != vmClasses::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");
// ------------------------------------------------------------------ // 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);
}
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