Mercurial > hg > truffle
view graal/com.oracle.graal.lir/src/com/oracle/graal/lir/LabelRef.java @ 19578:f918e65eb2bb
Simplify scheduleOutOfLoops.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Tue, 24 Feb 2015 00:07:00 +0100 |
parents | 9bb45bec2b1f |
children | 6df25b1418be |
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/* * Copyright (c) 2011, 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.oracle.graal.lir; import com.oracle.graal.asm.*; import com.oracle.graal.compiler.common.cfg.*; import com.oracle.graal.lir.StandardOp.BranchOp; import com.oracle.graal.lir.StandardOp.JumpOp; /** * LIR instructions such as {@link JumpOp} and {@link BranchOp} need to reference their target * {@link AbstractBlockBase}. However, direct references are not possible since the control flow * graph (and therefore successors lists) can be changed by optimizations - and fixing the * instructions is error prone. Therefore, we represent an edge to block B from block A via the * tuple {@code (A, * successor-index-of-B)}. That is, indirectly by storing the index into the successor list of A. * Note therefore that the successor list cannot be re-ordered. */ public final class LabelRef { private final LIR lir; private final AbstractBlockBase<?> block; private final int suxIndex; /** * Returns a new reference to a successor of the given block. * * @param block The base block that contains the successor list. * @param suxIndex The index of the successor. * @return The newly created label reference. */ public static LabelRef forSuccessor(final LIR lir, final AbstractBlockBase<?> block, final int suxIndex) { return new LabelRef(lir, block, suxIndex); } /** * Returns a new reference to a successor of the given block. * * @param block The base block that contains the successor list. * @param suxIndex The index of the successor. */ private LabelRef(final LIR lir, final AbstractBlockBase<?> block, final int suxIndex) { this.lir = lir; this.block = block; this.suxIndex = suxIndex; } public AbstractBlockBase<?> getSourceBlock() { return block; } public AbstractBlockBase<?> getTargetBlock() { return block.getSuccessors().get(suxIndex); } public Label label() { return ((StandardOp.LabelOp) lir.getLIRforBlock(getTargetBlock()).get(0)).getLabel(); } @Override public String toString() { return getSourceBlock() + " -> " + (suxIndex < block.getSuccessors().size() ? getTargetBlock() : "?"); } }