| /* |
| * Copyright (c) 2011, 2012, 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_VM_CI_CIBASEOBJECT_HPP |
| #define SHARE_VM_CI_CIBASEOBJECT_HPP |
| |
| #include "ci/ciClassList.hpp" |
| #include "memory/allocation.hpp" |
| #include "runtime/handles.hpp" |
| #include "runtime/jniHandles.hpp" |
| |
| // ciBaseObject |
| // |
| // 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 ciBaseObject holds a handle |
| // to a corresponding oop on the VM side and provides routines |
| // for accessing the information in its oop. By using the ciBaseObject |
| // 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 ciBaseObject : public ResourceObj { |
| CI_PACKAGE_ACCESS |
| friend class ciEnv; |
| |
| protected: |
| uint _ident; |
| |
| enum { FLAG_BITS = 1 }; |
| enum { |
| SCAVENGABLE_FLAG = 1 |
| }; |
| protected: |
| ciBaseObject(): _ident(0) {} |
| |
| virtual const char* type_string() { return "ciBaseObject"; } |
| |
| void set_ident(uint id); |
| |
| public: |
| // A number unique to this object. |
| uint ident(); |
| |
| // What kind of ciBaseObject is this? |
| virtual bool is_symbol() const { return false; } |
| virtual bool is_object() const { return false; } |
| virtual bool is_metadata() const { return false; } |
| |
| ciSymbol* as_symbol() { |
| assert(is_symbol(), "must be"); |
| return (ciSymbol*)this; |
| } |
| ciObject* as_object() { |
| assert(is_object(), "must be"); |
| return (ciObject*)this; |
| } |
| ciMetadata* as_metadata() { |
| assert(is_metadata(), "must be"); |
| return (ciMetadata*)this; |
| } |
| }; |
| #endif // SHARE_VM_CI_CIBASEOBJECT_HPP |