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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Unwind.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) 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.cri.ci.*;
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28
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29 /**
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30 * Unwind takes an exception object, destroys the current stack frame and passes the exception object to the system's exception dispatch code.
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31 */
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32 public final class Unwind extends BlockEnd {
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33
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34 private static final int INPUT_COUNT = 1;
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35 private static final int INPUT_EXCEPTION = 0;
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36
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37 private static final int SUCCESSOR_COUNT = 0;
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38
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39 @Override
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40 protected int inputCount() {
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41 return super.inputCount() + INPUT_COUNT;
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42 }
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43
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44 @Override
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45 protected int successorCount() {
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46 return super.successorCount() + SUCCESSOR_COUNT;
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47 }
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48
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49 /**
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50 * The instruction that produces the exception object.
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51 */
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52 public Value exception() {
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53 return (Value) inputs().get(super.inputCount() + INPUT_EXCEPTION);
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54 }
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55
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56 public Value setException(Value n) {
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57 assert n == null || n.kind == CiKind.Object;
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58 return (Value) inputs().set(super.inputCount() + INPUT_EXCEPTION, n);
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59 }
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60
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61 public Unwind(Value exception, boolean isSafepoint, Graph graph) {
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62 super(CiKind.Object, null, isSafepoint, 0, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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63 setException(exception);
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64 }
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65
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66 @Override
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67 public void accept(ValueVisitor v) {
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68 v.visitUnwind(this);
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69 }
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70
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71 @Override
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72 public void print(LogStream out) {
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73 out.print(kind.typeChar).print("unwind ").print(exception());
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74 }
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75 }