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annotate graal/GraalCompiler/src/com/sun/c1x/ir/ExceptionHandler.java @ 2519:f6125fb5bfbc

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Removed intrinsics.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 16:25:32 +0200
parents 16b9a8b5ad39
children 46586c77b129
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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 * @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 }