Mercurial > hg > truffle
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/GraalCompiler/src/com/sun/c1x/ir/ExceptionDispatch.java Wed May 18 18:09:20 2011 +0200 @@ -0,0 +1,143 @@ +/* + * 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(); + } + + +}