Mercurial > hg > graal-compiler
diff graal/GraalCompiler/src/com/sun/c1x/ir/Placeholder.java @ 2730:027adfafd47e
first batch of GraphBuilder changes to remove dependencies on BlockBegin
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Thu, 19 May 2011 17:24:23 +0200 |
parents | |
children | bda5972a40a5 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/GraalCompiler/src/com/sun/c1x/ir/Placeholder.java Thu May 19 17:24:23 2011 +0200 @@ -0,0 +1,84 @@ +/* + * Copyright (c) 2011, 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. + */ +package com.sun.c1x.ir; + +import com.oracle.graal.graph.*; +import com.sun.c1x.debug.*; +import com.sun.c1x.value.*; +import com.sun.cri.ci.*; + + +public class Placeholder extends Instruction { + + private static final int INPUT_COUNT = 1; + private static final int INPUT_STATE_BEFORE = 0; + + private static final int SUCCESSOR_COUNT = 0; + + @Override + protected int inputCount() { + return super.inputCount() + INPUT_COUNT; + } + + @Override + protected int successorCount() { + return super.successorCount() + SUCCESSOR_COUNT; + } + + /** + * The state for this instruction. + */ + public FrameState stateBefore() { + return (FrameState) inputs().get(super.inputCount() + INPUT_STATE_BEFORE); + } + + public FrameState setStateBefore(FrameState n) { + FrameState oldState = stateBefore(); + try { + return (FrameState) inputs().set(super.inputCount() + INPUT_STATE_BEFORE, n); + } finally { + if (oldState != n && oldState != null) { + oldState.delete(); + } + } + } + + public Placeholder(Graph graph) { + super(CiKind.Void, INPUT_COUNT, SUCCESSOR_COUNT, graph); + } + + @Override + public void accept(ValueVisitor v) { + assert false; + } + + @Override + public void print(LogStream out) { + assert false; + } + + @Override + public String shortName() { + return "Placeholder" + id(); + } +}