Mercurial > hg > graal-jvmci-8
annotate graal/Compiler/src/com/sun/c1x/ir/ExceptionHandler.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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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 * @author Ben L. Titzer |
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40 */ |
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41 public final class ExceptionHandler { |
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42 |
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43 public static final List<ExceptionHandler> ZERO_HANDLERS = Collections.emptyList(); |
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44 |
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45 public final RiExceptionHandler handler; |
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46 private BlockBegin entryBlock; |
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47 private LIRList entryCode; |
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48 private int entryCodeOffset; |
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49 private int phiOperand; |
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50 private int scopeCount; |
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51 private int lirOpId; |
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52 |
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53 public ExceptionHandler(RiExceptionHandler handler) { |
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54 this.handler = handler; |
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55 this.entryCodeOffset = -1; |
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56 this.phiOperand = -1; |
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57 this.scopeCount = -1; |
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58 this.lirOpId = -1; |
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59 } |
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60 |
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61 public ExceptionHandler(ExceptionHandler other) { |
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62 this.handler = other.handler; |
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63 this.entryBlock = other.entryBlock; |
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64 this.entryCode = other.entryCode; |
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65 this.entryCodeOffset = other.entryCodeOffset; |
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66 this.phiOperand = other.phiOperand; |
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67 this.scopeCount = other.scopeCount; |
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68 this.lirOpId = other.lirOpId; |
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69 } |
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70 |
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71 @Override |
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72 public String toString() { |
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73 return "XHandler(Block=" + entryBlock.blockID + ") " + handler; |
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74 } |
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75 |
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76 /** |
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77 * Gets the compiler interface object that describes this exception handler, |
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78 * including the bytecode ranges. |
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79 * @return the compiler interface exception handler |
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80 */ |
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81 public RiExceptionHandler handler() { |
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82 return handler; |
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83 } |
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84 |
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85 /** |
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86 * Gets the bytecode index of the handler (catch block). |
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87 * @return the bytecode index of the handler |
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88 */ |
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89 public int handlerBCI() { |
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90 return handler.handlerBCI(); |
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91 } |
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92 |
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93 /** |
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94 * Utility method to check if this exception handler covers the specified bytecode index. |
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95 * @param bci the bytecode index to check |
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96 * @return {@code true} if this exception handler covers the specified bytecode |
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97 */ |
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98 public boolean covers(int bci) { |
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99 return handler.startBCI() <= bci && bci < handler.endBCI(); |
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100 } |
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101 |
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102 /** |
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103 * Gets the entry block for this exception handler. |
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104 * @return the entry block |
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105 */ |
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106 public BlockBegin entryBlock() { |
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107 return entryBlock; |
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108 } |
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109 |
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110 /** |
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111 * Gets the PC offset of the handler entrypoint, which is used by |
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112 * the runtime to forward exception points to their catch sites. |
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113 * @return the pc offset of the handler entrypoint |
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114 */ |
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115 public int entryCodeOffset() { |
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116 return entryCodeOffset; |
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117 } |
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118 |
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119 public int phiOperand() { |
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120 return phiOperand; |
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121 } |
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122 |
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123 public int scopeCount() { |
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124 return scopeCount; |
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125 } |
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126 |
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127 public void setEntryBlock(BlockBegin entry) { |
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128 entryBlock = entry; |
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129 } |
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130 |
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131 public void setEntryCodeOffset(int pco) { |
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132 entryCodeOffset = pco; |
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133 } |
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134 |
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135 public void setPhiOperand(int phi) { |
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136 phiOperand = phi; |
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137 } |
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138 |
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139 public void setScopeCount(int count) { |
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140 scopeCount = count; |
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141 } |
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142 |
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143 public boolean isCatchAll() { |
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144 return handler.catchTypeCPI() == 0; |
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145 } |
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146 |
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147 public static boolean couldCatch(List<ExceptionHandler> exceptionHandlers, RiType klass, boolean typeIsExact) { |
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148 // the type is unknown so be conservative |
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149 if (!klass.isResolved()) { |
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150 return true; |
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151 } |
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152 |
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153 for (int i = 0; i < exceptionHandlers.size(); i++) { |
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154 ExceptionHandler handler = exceptionHandlers.get(i); |
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155 if (handler.isCatchAll()) { |
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156 // catch of ANY |
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157 return true; |
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158 } |
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159 RiType handlerKlass = handler.handler.catchType(); |
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160 // if it's unknown it might be catchable |
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161 if (!handlerKlass.isResolved()) { |
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162 return true; |
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163 } |
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164 // if the throw type is definitely a subtype of the catch type |
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165 // then it can be caught. |
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166 if (klass.isSubtypeOf(handlerKlass)) { |
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167 return true; |
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168 } |
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169 if (!typeIsExact) { |
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170 // If the type isn't exactly known then it can also be caught by |
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171 // catch statements where the inexact type is a subtype of the |
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172 // catch type. |
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173 // given: foo extends bar extends Exception |
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174 // throw bar can be caught by catch foo, catch bar, and catch |
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175 // Exception, however it can't be caught by any handlers without |
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176 // bar in its type hierarchy. |
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177 if (handlerKlass.isSubtypeOf(klass)) { |
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178 return true; |
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179 } |
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180 } |
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181 } |
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182 return false; |
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183 } |
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184 |
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185 public int lirOpId() { |
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186 return lirOpId; |
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187 } |
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188 |
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189 public LIRList entryCode() { |
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190 return entryCode; |
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191 } |
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192 |
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193 public void setLirOpId(int throwingOpId) { |
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194 lirOpId = throwingOpId; |
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195 } |
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196 |
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197 public void setEntryCode(LIRList entryCode) { |
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198 this.entryCode = entryCode; |
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199 |
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200 } |
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201 } |