Mercurial > hg > graal-compiler
view graal/GraalCompiler/src/com/sun/c1x/ir/Throw.java @ 2610:39aa89baa165
cleanup: FrameState copy methods, ImmutableFrameState
author | Lukas Stadler <lukas.stadler@jku.at> |
---|---|
date | Fri, 06 May 2011 13:03:33 +0200 |
parents | 0c6564c254af |
children | 3558ca7088c0 |
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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.*; /** * The {@code Throw} instruction represents a throw of an exception. */ public final class Throw 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 which produces the exception to throw. */ 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); } FrameState stateBefore; /** * Creates a new Throw instruction. * @param exception the instruction that generates the exception to throw * @param stateAfter the state before the exception is thrown but after the exception object has been popped * @param isSafepoint {@code true} if this instruction is a safepoint instruction * @param graph */ public Throw(Value exception, FrameState stateAfter, boolean isSafepoint, Graph graph) { super(CiKind.Illegal, null, isSafepoint, 0, INPUT_COUNT, SUCCESSOR_COUNT, graph); this.stateBefore = stateAfter; setException(exception); } /** * Returns the state before this throw would occur. * @return the state before the throw */ @Override public FrameState stateBefore() { return stateBefore; } /** * Checks whether this instruction can trap. * @return {@code true} because this instruction definitely throws an exception! */ @Override public boolean canTrap() { return true; } @Override public void accept(ValueVisitor v) { v.visitThrow(this); } @Override public void print(LogStream out) { out.print("throw ").print(exception()); } }