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annotate graal/GraalCompiler/src/com/sun/c1x/ir/ExceptionHandler.java @ 2657:4a6518c4d17d

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Removed need for base instruction. Cleanup.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 11 May 2011 16:10:49 +0200
parents 46586c77b129
children 027adfafd47e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2507
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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 }