1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/ci/ciBaseObject.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,91 @@
1.4 +/*
1.5 + * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_CI_CIBASEOBJECT_HPP
1.29 +#define SHARE_VM_CI_CIBASEOBJECT_HPP
1.30 +
1.31 +#include "ci/ciClassList.hpp"
1.32 +#include "memory/allocation.hpp"
1.33 +#include "runtime/handles.hpp"
1.34 +#include "runtime/jniHandles.hpp"
1.35 +
1.36 +// ciBaseObject
1.37 +//
1.38 +// This class represents an oop in the HotSpot virtual machine.
1.39 +// Its subclasses are structured in a hierarchy which mirrors
1.40 +// an aggregate of the VM's oop and klass hierarchies (see
1.41 +// oopHierarchy.hpp). Each instance of ciBaseObject holds a handle
1.42 +// to a corresponding oop on the VM side and provides routines
1.43 +// for accessing the information in its oop. By using the ciBaseObject
1.44 +// hierarchy for accessing oops in the VM, the compiler ensures
1.45 +// that it is safe with respect to garbage collection; that is,
1.46 +// GC and compilation can proceed independently without
1.47 +// interference.
1.48 +//
1.49 +// Within the VM, the oop and klass hierarchies are separate.
1.50 +// The compiler interface does not preserve this separation --
1.51 +// the distinction between `Klass*' and `Klass' are not
1.52 +// reflected in the interface and instead the Klass hierarchy
1.53 +// is directly modeled as the subclasses of ciKlass.
1.54 +class ciBaseObject : public ResourceObj {
1.55 + CI_PACKAGE_ACCESS
1.56 + friend class ciEnv;
1.57 +
1.58 +protected:
1.59 + uint _ident;
1.60 +
1.61 + enum { FLAG_BITS = 1 };
1.62 + enum {
1.63 + SCAVENGABLE_FLAG = 1
1.64 + };
1.65 +protected:
1.66 + ciBaseObject(): _ident(0) {}
1.67 +
1.68 + virtual const char* type_string() { return "ciBaseObject"; }
1.69 +
1.70 + void set_ident(uint id);
1.71 +
1.72 +public:
1.73 + // A number unique to this object.
1.74 + uint ident();
1.75 +
1.76 + // What kind of ciBaseObject is this?
1.77 + virtual bool is_symbol() const { return false; }
1.78 + virtual bool is_object() const { return false; }
1.79 + virtual bool is_metadata() const { return false; }
1.80 +
1.81 + ciSymbol* as_symbol() {
1.82 + assert(is_symbol(), "must be");
1.83 + return (ciSymbol*)this;
1.84 + }
1.85 + ciObject* as_object() {
1.86 + assert(is_object(), "must be");
1.87 + return (ciObject*)this;
1.88 + }
1.89 + ciMetadata* as_metadata() {
1.90 + assert(is_metadata(), "must be");
1.91 + return (ciMetadata*)this;
1.92 + }
1.93 +};
1.94 +#endif // SHARE_VM_CI_CIBASEOBJECT_HPP
