Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/ExceptionHandler.java @ 2708:4272b7af2d17
merge
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 18 May 2011 18:40:58 +0200 |
parents | 4a6518c4d17d |
children | 027adfafd47e |
rev | line source |
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1 /* |
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2 * Copyright (c) 2009, 2011, 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.sun.c1x.ir; |
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24 |
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25 import java.util.*; |
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26 |
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27 import com.sun.c1x.lir.*; |
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28 import com.sun.cri.ri.*; |
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29 |
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30 /** |
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31 * The {@code ExceptionHandler} class represents an exception handler for a Java bytecode method. |
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32 * There is exactly one instance of this class for every exception handler without any specific |
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33 * reference to an exception-throwing instruction covered by the handler. Then there is one |
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34 * instance per exception-throwing instruction that is used to record the frame state before |
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35 * execution of the instruction. The latter is used to generate exception adapter blocks |
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36 * (see section 3.4 of the paper <a href="http://www.usenix.org/events/vee05/full_papers/p132-wimmer.pdf"> |
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37 * Optimized Interval Splitting in a Linear Scan Register Allocator</a>) where necessary. |
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38 */ |
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39 public final class ExceptionHandler { |
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40 |
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41 public static final List<ExceptionHandler> ZERO_HANDLERS = Collections.emptyList(); |
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42 |
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43 public final RiExceptionHandler handler; |
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44 private BlockBegin entryBlock; |
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45 private LIRList entryCode; |
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46 private int entryCodeOffset; |
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47 private int phiOperand; |
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48 private int lirOpId; |
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49 |
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50 public ExceptionHandler(RiExceptionHandler handler) { |
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51 this.handler = handler; |
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52 this.entryCodeOffset = -1; |
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53 this.phiOperand = -1; |
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54 this.lirOpId = -1; |
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55 } |
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56 |
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57 public ExceptionHandler(ExceptionHandler other) { |
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58 this.handler = other.handler; |
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59 this.entryBlock = other.entryBlock; |
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60 this.entryCode = other.entryCode; |
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61 this.entryCodeOffset = other.entryCodeOffset; |
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62 this.phiOperand = other.phiOperand; |
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63 this.lirOpId = other.lirOpId; |
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64 } |
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65 |
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66 @Override |
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67 public String toString() { |
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68 return "XHandler(Block=" + entryBlock.blockID + ") " + handler; |
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69 } |
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70 |
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71 /** |
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72 * Gets the compiler interface object that describes this exception handler, |
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73 * including the bytecode ranges. |
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74 * @return the compiler interface exception handler |
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75 */ |
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76 public RiExceptionHandler handler() { |
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77 return handler; |
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78 } |
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79 |
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80 /** |
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81 * Gets the bytecode index of the handler (catch block). |
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82 * @return the bytecode index of the handler |
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83 */ |
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84 public int handlerBCI() { |
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85 return handler.handlerBCI(); |
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86 } |
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87 |
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88 /** |
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89 * Utility method to check if this exception handler covers the specified bytecode index. |
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90 * @param bci the bytecode index to check |
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91 * @return {@code true} if this exception handler covers the specified bytecode |
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92 */ |
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93 public boolean covers(int bci) { |
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94 return handler.startBCI() <= bci && bci < handler.endBCI(); |
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95 } |
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96 |
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97 /** |
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98 * Gets the entry block for this exception handler. |
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99 * @return the entry block |
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100 */ |
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101 public BlockBegin entryBlock() { |
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102 return entryBlock; |
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103 } |
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104 |
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105 /** |
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106 * Gets the PC offset of the handler entrypoint, which is used by |
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107 * the runtime to forward exception points to their catch sites. |
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108 * @return the pc offset of the handler entrypoint |
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109 */ |
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110 public int entryCodeOffset() { |
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111 return entryCodeOffset; |
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112 } |
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113 |
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114 public int phiOperand() { |
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115 return phiOperand; |
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116 } |
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117 |
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118 public void setEntryBlock(BlockBegin entry) { |
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119 entryBlock = entry; |
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120 } |
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121 |
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122 public void setEntryCodeOffset(int pco) { |
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123 entryCodeOffset = pco; |
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124 } |
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125 |
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126 public void setPhiOperand(int phi) { |
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127 phiOperand = phi; |
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128 } |
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129 |
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130 public boolean isCatchAll() { |
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131 return handler.catchTypeCPI() == 0; |
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132 } |
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133 |
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134 public static boolean couldCatch(List<ExceptionHandler> exceptionHandlers, RiType klass, boolean typeIsExact) { |
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135 // the type is unknown so be conservative |
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136 if (!klass.isResolved()) { |
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137 return true; |
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138 } |
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139 |
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140 for (int i = 0; i < exceptionHandlers.size(); i++) { |
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141 ExceptionHandler handler = exceptionHandlers.get(i); |
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142 if (handler.isCatchAll()) { |
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143 // catch of ANY |
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144 return true; |
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145 } |
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146 RiType handlerKlass = handler.handler.catchType(); |
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147 // if it's unknown it might be catchable |
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148 if (!handlerKlass.isResolved()) { |
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149 return true; |
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150 } |
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151 // if the throw type is definitely a subtype of the catch type |
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152 // then it can be caught. |
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153 if (klass.isSubtypeOf(handlerKlass)) { |
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154 return true; |
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155 } |
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156 if (!typeIsExact) { |
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157 // If the type isn't exactly known then it can also be caught by |
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158 // catch statements where the inexact type is a subtype of the |
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159 // catch type. |
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160 // given: foo extends bar extends Exception |
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161 // throw bar can be caught by catch foo, catch bar, and catch |
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162 // Exception, however it can't be caught by any handlers without |
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163 // bar in its type hierarchy. |
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164 if (handlerKlass.isSubtypeOf(klass)) { |
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165 return true; |
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166 } |
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167 } |
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168 } |
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169 return false; |
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170 } |
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171 |
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172 public int lirOpId() { |
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173 return lirOpId; |
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174 } |
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175 |
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176 public LIRList entryCode() { |
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177 return entryCode; |
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178 } |
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179 |
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180 public void setLirOpId(int throwingOpId) { |
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181 lirOpId = throwingOpId; |
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182 } |
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183 |
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184 public void setEntryCode(LIRList entryCode) { |
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185 this.entryCode = entryCode; |
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186 |
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187 } |
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188 } |