Mercurial > hg > graal-compiler
view graal/GraalCompiler/src/com/sun/c1x/ir/BlockEnd.java @ 2585:3e0e65161345
new node layout: Op2
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Thu, 05 May 2011 14:12:19 +0200 |
parents | 4a36a0bd6d18 |
children | 0c6564c254af |
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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 java.util.*; import com.sun.c1x.util.*; import com.sun.c1x.value.*; import com.sun.cri.ci.*; /** * The {@code BlockEnd} instruction is a base class for all instructions that end a basic * block, including branches, switches, throws, and goto's. */ public abstract class BlockEnd extends Instruction { BlockBegin begin; final List<BlockBegin> successors; FrameState stateAfter; boolean isSafepoint; /** * Constructs a new block end with the specified value type. * @param kind the type of the value produced by this instruction * @param stateAfter the frame state at the end of this block * @param isSafepoint {@code true} if this instruction is a safepoint instruction * @param successors the list of successor blocks. If {@code null}, a new one will be created. */ public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, List<BlockBegin> successors) { super(kind); this.successors = successors == null ? new ArrayList<BlockBegin>(2) : successors; setStateAfter(stateAfter); this.isSafepoint = isSafepoint; } public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint) { this(kind, stateAfter, isSafepoint, null); } /** * Gets the state after the end of this block. */ @Override public FrameState stateAfter() { return stateAfter; } public void setStateAfter(FrameState state) { stateAfter = state; } /** * Checks whether this instruction is a safepoint. * @return {@code true} if this instruction is a safepoint */ public boolean isSafepoint() { return isSafepoint; } /** * Gets the block begin associated with this block end. * @return the beginning of this basic block */ public BlockBegin begin() { return begin; } /** * Sets the basic block beginning for this block end. This should only * be called from {@link BlockBegin}. * * @param block the beginning of this basic block */ void setBegin(BlockBegin block) { begin = block; } /** * Substitutes a successor block in this block end's successor list. Note that * this method updates all occurrences in the list. * @param oldSucc the old successor to replace * @param newSucc the new successor */ public void substituteSuccessor(BlockBegin oldSucc, BlockBegin newSucc) { assert newSucc != null; Util.replaceAllInList(oldSucc, newSucc, successors); } /** * Gets the successor corresponding to the default (fall through) case. * @return the default successor */ public BlockBegin defaultSuccessor() { return successors.get(successors.size() - 1); } /** * Searches for the specified successor and returns its index into the * successor list if found. * @param b the block to search for in the successor list * @return the index of the block in the list if found; <code>-1</code> otherwise */ public int successorIndex(BlockBegin b) { final int max = successors.size(); for (int i = 0; i < max; i++) { if (successors.get(i) == b) { return i; } } return -1; } /** * Gets this block end's list of successors. * @return the successor list */ public List<BlockBegin> blockSuccessors() { return successors; } /** * Gets the successor at a specified index. * @param index the index of the successor * @return the successor */ public BlockBegin suxAt(int index) { return successors.get(index); } }