Mercurial > hg > graal-jvmci-8
comparison 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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2729:108adba3345e | 2730:027adfafd47e |
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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 } |