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annotate graal/GraalCompiler/src/com/sun/c1x/ir/ExceptionDispatch.java @ 2707:7ed72769d51a

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exception handling related changes: * changed blockPredecessors to list of Instructions, instead of Blocks * removed explicit predecessor management in BlockBegin, now using predecessors from Graph structure * replaced generated LIR exception entries with exception dispatch chains in IR * added Unwind and ExceptionDispatch instructions * removed ExceptionEntry flag in BlockBegin and all code depending on it * removed exceptionHandler list from Instruction, replaced by exception Edge on Invoke and Throw * replaced list of ExceptionHandlers with single exception edge in debug info misc: * changed GraphvizPrinter layout (smaller ports on large nodes) * removed defunct run config
author Lukas Stadler <lukas.stadler@jku.at>
date Wed, 18 May 2011 18:09:20 +0200
parents
children a0dd2b907806
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2707
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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 com.oracle.graal.graph.*;
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26 import com.sun.c1x.debug.*;
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27 import com.sun.c1x.value.*;
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28 import com.sun.cri.ci.*;
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29
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30 /**
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31 * This instruction takes an exception object and has two successors:
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32 * The catchSuccessor is called whenever the exception matches the given type, otherwise otherSuccessor is called.
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33 */
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34 public final class ExceptionDispatch extends BlockEnd {
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35
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36 private static final int INPUT_COUNT = 1;
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37 private static final int INPUT_EXCEPTION = 0;
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38
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39 private static final int SUCCESSOR_COUNT = 0;
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40
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41 @Override
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42 protected int inputCount() {
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43 return super.inputCount() + INPUT_COUNT;
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44 }
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45
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46 @Override
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47 protected int successorCount() {
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48 return super.successorCount() + SUCCESSOR_COUNT;
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49 }
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50
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51 /**
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52 * The instruction producing the exception object.
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53 */
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54 public Value exception() {
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55 return (Value) inputs().get(super.inputCount() + INPUT_EXCEPTION);
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56 }
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57
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58 public Value setException(Value n) {
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59 return (Value) inputs().set(super.inputCount() + INPUT_EXCEPTION, n);
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60 }
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61
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62 private final ExceptionHandler handler;
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63
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64 /**
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65 * Constructs a new ExceptionDispatch instruction.
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66 */
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67 public ExceptionDispatch(Value exception, BlockBegin catchSuccessor, BlockBegin otherSuccessor, ExceptionHandler handler, FrameState stateAfter, boolean isSafepoint, Graph graph) {
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68 super(CiKind.Int, stateAfter, isSafepoint, 2, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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69 setException(exception);
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70 setBlockSuccessor(0, otherSuccessor);
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71 setBlockSuccessor(1, catchSuccessor);
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72 this.handler = handler;
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73 }
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74
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75 public ExceptionHandler handler() {
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76 return handler;
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77 }
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78
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79 /**
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80 * Gets the block corresponding to the catch block.
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81 * @return the true successor
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82 */
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83 public BlockBegin catchSuccessor() {
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84 return blockSuccessor(1);
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85 }
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86
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87 /**
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88 * Gets the block corresponding to the rest of the dispatch chain.
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89 * @return the false successor
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90 */
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91 public BlockBegin otherSuccessor() {
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92 return blockSuccessor(0);
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93 }
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94
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95 /**
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96 * Gets the block corresponding to the specified outcome of the branch.
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97 * @param istrue {@code true} if the true successor is requested, {@code false} otherwise
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98 * @return the corresponding successor
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99 */
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100 public BlockBegin successor(boolean istrue) {
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101 return blockSuccessor(istrue ? 1 : 0);
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102 }
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103
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104 /**
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105 * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=)
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106 * @see Condition#negate()
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107 */
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108 public void swapSuccessors() {
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109 BlockBegin t = blockSuccessor(0);
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110 BlockBegin f = blockSuccessor(1);
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111 setBlockSuccessor(0, f);
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112 setBlockSuccessor(1, t);
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113 }
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114
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115 @Override
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116 public void accept(ValueVisitor v) {
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117 v.visitExceptionDispatch(this);
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118 }
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119
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120 @Override
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121 public void print(LogStream out) {
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122 out.print("exception_dispatch ").
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123 print(exception()).
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124 print(' ').
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125 print("instanceof").
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126 print(' ').
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127 print(handler.handler.catchType().name()).
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128 print(" then B").
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129 print(blockSuccessors().get(1).blockID).
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130 print(" else B").
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131 print(blockSuccessors().get(0).blockID);
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132 if (isSafepoint()) {
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133 out.print(" (safepoint)");
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134 }
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135 }
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136
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137 @Override
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138 public String shortName() {
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139 return "Dispatch " + handler.handler.catchType().name();
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140 }
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141
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142
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143 }