aoqi@0: /*
aoqi@0:  * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_CI_CIBASEOBJECT_HPP
aoqi@0: #define SHARE_VM_CI_CIBASEOBJECT_HPP
aoqi@0: 
aoqi@0: #include "ci/ciClassList.hpp"
aoqi@0: #include "memory/allocation.hpp"
aoqi@0: #include "runtime/handles.hpp"
aoqi@0: #include "runtime/jniHandles.hpp"
aoqi@0: 
aoqi@0: // ciBaseObject
aoqi@0: //
aoqi@0: // This class represents an oop in the HotSpot virtual machine.
aoqi@0: // Its subclasses are structured in a hierarchy which mirrors
aoqi@0: // an aggregate of the VM's oop and klass hierarchies (see
aoqi@0: // oopHierarchy.hpp).  Each instance of ciBaseObject holds a handle
aoqi@0: // to a corresponding oop on the VM side and provides routines
aoqi@0: // for accessing the information in its oop.  By using the ciBaseObject
aoqi@0: // hierarchy for accessing oops in the VM, the compiler ensures
aoqi@0: // that it is safe with respect to garbage collection; that is,
aoqi@0: // GC and compilation can proceed independently without
aoqi@0: // interference.
aoqi@0: //
aoqi@0: // Within the VM, the oop and klass hierarchies are separate.
aoqi@0: // The compiler interface does not preserve this separation --
aoqi@0: // the distinction between `Klass*' and `Klass' are not
aoqi@0: // reflected in the interface and instead the Klass hierarchy
aoqi@0: // is directly modeled as the subclasses of ciKlass.
aoqi@0: class ciBaseObject : public ResourceObj {
aoqi@0:   CI_PACKAGE_ACCESS
aoqi@0:   friend class ciEnv;
aoqi@0: 
aoqi@0: protected:
aoqi@0:   uint     _ident;
aoqi@0: 
aoqi@0:   enum { FLAG_BITS   = 1 };
aoqi@0:   enum {
aoqi@0:          SCAVENGABLE_FLAG = 1
aoqi@0:        };
aoqi@0: protected:
aoqi@0:   ciBaseObject(): _ident(0) {}
aoqi@0: 
aoqi@0:   virtual const char* type_string() { return "ciBaseObject"; }
aoqi@0: 
aoqi@0:   void set_ident(uint id);
aoqi@0: 
aoqi@0: public:
aoqi@0:   // A number unique to this object.
aoqi@0:   uint ident();
aoqi@0: 
aoqi@0:   // What kind of ciBaseObject is this?
aoqi@0:   virtual bool is_symbol() const       { return false; }
aoqi@0:   virtual bool is_object() const       { return false; }
aoqi@0:   virtual bool is_metadata() const     { return false; }
aoqi@0: 
aoqi@0:   ciSymbol* as_symbol() {
aoqi@0:     assert(is_symbol(), "must be");
aoqi@0:     return (ciSymbol*)this;
aoqi@0:   }
aoqi@0:   ciObject* as_object() {
aoqi@0:     assert(is_object(), "must be");
aoqi@0:     return (ciObject*)this;
aoqi@0:   }
aoqi@0:   ciMetadata* as_metadata() {
aoqi@0:     assert(is_metadata(), "must be");
aoqi@0:     return (ciMetadata*)this;
aoqi@0:   }
aoqi@0: };
aoqi@0: #endif // SHARE_VM_CI_CIBASEOBJECT_HPP