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/*
* Copyright (c) 1999, 2022, 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.
*
*/
#ifndef SHARE_CI_CIOBJECT_HPP
#define SHARE_CI_CIOBJECT_HPP
#include "ci/ciBaseObject.hpp"
#include "ci/ciClassList.hpp"
#include "runtime/handles.hpp"
// ciObject
//
// This class represents an oop in the HotSpot virtual machine.
// Its subclasses are structured in a hierarchy which mirrors
// an aggregate of the VM's oop and klass hierarchies (see
// oopHierarchy.hpp). Each instance of ciObject holds a handle
// to a corresponding oop on the VM side and provides routines
// for accessing the information in its oop. By using the ciObject
// hierarchy for accessing oops in the VM, the compiler ensures
// that it is safe with respect to garbage collection; that is,
// GC and compilation can proceed independently without
// interference.
//
// Within the VM, the oop and klass hierarchies are separate.
// The compiler interface does not preserve this separation --
// the distinction between `Klass*' and `Klass' are not
// reflected in the interface and instead the Klass hierarchy
// is directly modeled as the subclasses of ciKlass.
class ciObject : public ciBaseObject {
CI_PACKAGE_ACCESS
friend class ciEnv;
private:
// A JNI handle referring to an oop in the VM. This
// handle may, in a small set of cases, correctly be NULL.
jobject _handle;
ciKlass* _klass;
protected:
ciObject();
ciObject(oop o);
ciObject(Handle h);
ciObject(ciKlass* klass);
jobject handle() const { return _handle; }
// Get the VM oop that this object holds.
oop get_oop() const;
// Virtual behavior of the print() method.
virtual void print_impl(outputStream* st) {}
virtual const char* type_string() { return "ciObject"; }
public:
// The klass of this ciObject.
ciKlass* klass();
// Are two ciObjects equal?
bool equals(ciObject* obj);
// A hash value for the convenience of compilers.
int hash();
// Tells if this oop should be made a constant.
bool should_be_constant();
// The address which the compiler should embed into the
// generated code to represent this oop. This address
// is not the true address of the oop -- it will get patched
// during nmethod creation.
//
// Usage note: no address arithmetic allowed. Oop must
// be registered with the oopRecorder.
jobject constant_encoding();
virtual bool is_object() const { return true; }
// What kind of ciObject is this?
virtual bool is_null_object() const { return false; }
virtual bool is_call_site() const { return false; }
virtual bool is_instance() { return false; }
virtual bool is_member_name() const { return false; }
virtual bool is_method_handle() const { return false; }
virtual bool is_method_type() const { return false; }
virtual bool is_array() { return false; }
virtual bool is_obj_array() { return false; }
virtual bool is_type_array() { return false; }
virtual bool is_native_entry_point()const { return false; }
// Is this a type or value which has no associated class?
// It is true of primitive types and null objects.
virtual bool is_classless() const { return false; }
virtual void dump_replay_data(outputStream* st) { /* do nothing */ }
// Note: some ciObjects refer to oops which have yet to be created.
// We refer to these as "unloaded". Specifically, there are
// unloaded instances of java.lang.Class,
// java.lang.invoke.MethodHandle, and java.lang.invoke.MethodType.
// By convention the ciNullObject is considered loaded, and
// primitive types are considered loaded.
bool is_loaded() const {
return handle() != NULL || is_classless();
}
// Subclass casting with assertions.
ciNullObject* as_null_object() {
assert(is_null_object(), "bad cast");
return (ciNullObject*)this;
}
ciCallSite* as_call_site() {
assert(is_call_site(), "bad cast");
return (ciCallSite*)this;
}
ciInstance* as_instance() {
assert(is_instance(), "bad cast");
return (ciInstance*)this;
}
ciMemberName* as_member_name() {
assert(is_member_name(), "bad cast");
return (ciMemberName*)this;
}
ciMethodHandle* as_method_handle() {
assert(is_method_handle(), "bad cast");
return (ciMethodHandle*)this;
}
ciMethodType* as_method_type() {
assert(is_method_type(), "bad cast");
return (ciMethodType*)this;
}
ciArray* as_array() {
assert(is_array(), "bad cast");
return (ciArray*)this;
}
ciObjArray* as_obj_array() {
assert(is_obj_array(), "bad cast");
return (ciObjArray*)this;
}
ciTypeArray* as_type_array() {
assert(is_type_array(), "bad cast");
return (ciTypeArray*)this;
}
// Print debugging output about this ciObject.
void print(outputStream* st);
void print() { print(tty); } // GDB cannot handle default arguments
// Print debugging output about the oop this ciObject represents.
void print_oop(outputStream* st = tty);
};
#endif // SHARE_CI_CIOBJECT_HPP
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