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comparison graal/GraalCompiler/src/com/sun/c1x/ir/Placeholder.java @ 2730:027adfafd47e

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first batch of GraphBuilder changes to remove dependencies on BlockBegin
author Lukas Stadler <lukas.stadler@jku.at>
date Thu, 19 May 2011 17:24:23 +0200
parents
children bda5972a40a5
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2729:108adba3345e 2730:027adfafd47e
1 /*
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.sun.c1x.ir;
24
25 import com.oracle.graal.graph.*;
26 import com.sun.c1x.debug.*;
27 import com.sun.c1x.value.*;
28 import com.sun.cri.ci.*;
29
30
31 public class Placeholder extends Instruction {
32
33 private static final int INPUT_COUNT = 1;
34 private static final int INPUT_STATE_BEFORE = 0;
35
36 private static final int SUCCESSOR_COUNT = 0;
37
38 @Override
39 protected int inputCount() {
40 return super.inputCount() + INPUT_COUNT;
41 }
42
43 @Override
44 protected int successorCount() {
45 return super.successorCount() + SUCCESSOR_COUNT;
46 }
47
48 /**
49 * The state for this instruction.
50 */
51 public FrameState stateBefore() {
52 return (FrameState) inputs().get(super.inputCount() + INPUT_STATE_BEFORE);
53 }
54
55 public FrameState setStateBefore(FrameState n) {
56 FrameState oldState = stateBefore();
57 try {
58 return (FrameState) inputs().set(super.inputCount() + INPUT_STATE_BEFORE, n);
59 } finally {
60 if (oldState != n && oldState != null) {
61 oldState.delete();
62 }
63 }
64 }
65
66 public Placeholder(Graph graph) {
67 super(CiKind.Void, INPUT_COUNT, SUCCESSOR_COUNT, graph);
68 }
69
70 @Override
71 public void accept(ValueVisitor v) {
72 assert false;
73 }
74
75 @Override
76 public void print(LogStream out) {
77 assert false;
78 }
79
80 @Override
81 public String shortName() {
82 return "Placeholder" + id();
83 }
84 }