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annotate graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/type/IllegalStamp.java @ 20110:51f2e71b57aa

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Improvements to the Stamp infrastructure. New methods Stamp#improveWith, Stamp#tryImproveWith, Stamp#isIllegal.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Wed, 01 Apr 2015 16:36:15 +0200
parents 5ea169a3bf81
children 7b0ff8da6057
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1 /*
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2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.compiler.common.type;
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24
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.compiler.common.*;
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27 import com.oracle.graal.compiler.common.spi.*;
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28
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29 /**
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30 * This stamp represents the illegal type. Values with this type can not exist at run time.
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31 */
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32 public final class IllegalStamp extends Stamp {
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33
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34 private IllegalStamp() {
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35 }
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36
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37 @Override
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38 public Kind getStackKind() {
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39 return Kind.Illegal;
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40 }
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41
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42 @Override
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43 public LIRKind getLIRKind(LIRKindTool tool) {
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44 throw GraalInternalError.shouldNotReachHere("illegal stamp should not reach backend");
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45 }
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46
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47 @Override
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48 public Stamp unrestricted() {
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49 return this;
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50 }
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51
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52 @Override
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53 public Stamp illegal() {
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54 return this;
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55 }
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56
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57 @Override
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58 public Stamp constant(Constant c, MetaAccessProvider meta) {
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59 throw GraalInternalError.shouldNotReachHere("illegal stamp has no value");
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60 }
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61
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62 @Override
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63 public ResolvedJavaType javaType(MetaAccessProvider metaAccess) {
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64 throw GraalInternalError.shouldNotReachHere("illegal stamp has no Java type");
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65 }
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66
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67 @Override
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68 public Stamp meet(Stamp other) {
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69 return this;
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70 }
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71
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72 @Override
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73 public Stamp join(Stamp other) {
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74 return this;
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75 }
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76
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77 @Override
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78 public boolean isCompatible(Stamp stamp) {
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79 return false;
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80 }
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81
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82 @Override
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83 public String toString() {
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84 return "ILLEGAL";
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85 }
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86
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87 @Override
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88 public boolean isLegal() {
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89 return false;
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90 }
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91
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92 @Override
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93 public Stamp improveWith(Stamp other) {
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94 return this;
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95 }
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97 @Override
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98 public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) {
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99 throw GraalInternalError.shouldNotReachHere("can't read values of illegal stamp");
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100 }
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101
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102 private static final IllegalStamp instance = new IllegalStamp();
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103
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104 static IllegalStamp getInstance() {
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105 return instance;
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106 }
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107 }