Mercurial > hg > truffle
view graal/GraalCompiler/src/com/sun/c1x/ir/ExceptionDispatch.java @ 2707:7ed72769d51a
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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/* * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.c1x.ir; import com.oracle.graal.graph.*; import com.sun.c1x.debug.*; import com.sun.c1x.value.*; import com.sun.cri.ci.*; /** * This instruction takes an exception object and has two successors: * The catchSuccessor is called whenever the exception matches the given type, otherwise otherSuccessor is called. */ public final class ExceptionDispatch extends BlockEnd { private static final int INPUT_COUNT = 1; private static final int INPUT_EXCEPTION = 0; private static final int SUCCESSOR_COUNT = 0; @Override protected int inputCount() { return super.inputCount() + INPUT_COUNT; } @Override protected int successorCount() { return super.successorCount() + SUCCESSOR_COUNT; } /** * The instruction producing the exception object. */ public Value exception() { return (Value) inputs().get(super.inputCount() + INPUT_EXCEPTION); } public Value setException(Value n) { return (Value) inputs().set(super.inputCount() + INPUT_EXCEPTION, n); } private final ExceptionHandler handler; /** * Constructs a new ExceptionDispatch instruction. */ public ExceptionDispatch(Value exception, BlockBegin catchSuccessor, BlockBegin otherSuccessor, ExceptionHandler handler, FrameState stateAfter, boolean isSafepoint, Graph graph) { super(CiKind.Int, stateAfter, isSafepoint, 2, INPUT_COUNT, SUCCESSOR_COUNT, graph); setException(exception); setBlockSuccessor(0, otherSuccessor); setBlockSuccessor(1, catchSuccessor); this.handler = handler; } public ExceptionHandler handler() { return handler; } /** * Gets the block corresponding to the catch block. * @return the true successor */ public BlockBegin catchSuccessor() { return blockSuccessor(1); } /** * Gets the block corresponding to the rest of the dispatch chain. * @return the false successor */ public BlockBegin otherSuccessor() { return blockSuccessor(0); } /** * Gets the block corresponding to the specified outcome of the branch. * @param istrue {@code true} if the true successor is requested, {@code false} otherwise * @return the corresponding successor */ public BlockBegin successor(boolean istrue) { return blockSuccessor(istrue ? 1 : 0); } /** * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=) * @see Condition#negate() */ public void swapSuccessors() { BlockBegin t = blockSuccessor(0); BlockBegin f = blockSuccessor(1); setBlockSuccessor(0, f); setBlockSuccessor(1, t); } @Override public void accept(ValueVisitor v) { v.visitExceptionDispatch(this); } @Override public void print(LogStream out) { out.print("exception_dispatch "). print(exception()). print(' '). print("instanceof"). print(' '). print(handler.handler.catchType().name()). print(" then B"). print(blockSuccessors().get(1).blockID). print(" else B"). print(blockSuccessors().get(0).blockID); if (isSafepoint()) { out.print(" (safepoint)"); } } @Override public String shortName() { return "Dispatch " + handler.handler.catchType().name(); } }