Mercurial > hg > graal-jvmci-8
view graal/GraalCompiler/src/com/sun/c1x/ir/If.java @ 2756:bfcdda4fdd73
Removed the direct connection between BlockBegin and BlockEnd.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
---|---|
date | Fri, 20 May 2011 14:51:45 +0200 |
parents | 6048da340364 |
children | 80b024e75b29 |
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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.util.*; import com.sun.c1x.value.*; import com.sun.cri.ci.*; /** * The {@code If} instruction represents a branch that can go one of two directions * depending on the outcome of a comparison. */ public final class If extends BlockEnd { private static final int INPUT_COUNT = 2; private static final int INPUT_X = 0; private static final int INPUT_Y = 1; 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 that produces the first input to this comparison. */ public Value x() { return (Value) inputs().get(super.inputCount() + INPUT_X); } public Value setX(Value n) { return (Value) inputs().set(super.inputCount() + INPUT_X, n); } /** * The instruction that produces the second input to this comparison. */ public Value y() { return (Value) inputs().get(super.inputCount() + INPUT_Y); } public Value setY(Value n) { return (Value) inputs().set(super.inputCount() + INPUT_Y, n); } Condition condition; boolean unorderedIsTrue; /** * Constructs a new If instruction. * @param x the instruction producing the first input to the instruction * @param cond the condition (comparison operation) * @param y the instruction that produces the second input to this instruction * @param trueSucc the block representing the true successor * @param falseSucc the block representing the false successor * @param stateAfter the state before the branch but after the input values have been popped * @param isSafepoint {@code true} if this branch should be considered a safepoint * @param graph */ public If(Value x, Condition cond, Value y, Instruction trueSucc, Instruction falseSucc, FrameState stateAfter, Graph graph) { super(CiKind.Illegal, stateAfter, 2, INPUT_COUNT, SUCCESSOR_COUNT, graph); assert Util.archKindsEqual(x, y); condition = cond; setX(x); setY(y); setBlockSuccessor(0, trueSucc); setBlockSuccessor(1, falseSucc); } /** * Gets the condition (comparison operation) for this instruction. * @return the condition */ public Condition condition() { return condition; } /** * Checks whether unordered inputs mean true or false. * @return {@code true} if unordered inputs produce true */ public boolean unorderedIsTrue() { return unorderedIsTrue; } /** * Gets the block corresponding to the true successor. * @return the true successor */ public BlockBegin trueSuccessor() { return blockSuccessor(0); } /** * Gets the block corresponding to the false successor. * @return the false successor */ public BlockBegin falseSuccessor() { return blockSuccessor(1); } /** * 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 ? 0 : 1); } /** * Gets the successor of this instruction for the unordered case. * @return the successor for unordered inputs */ public BlockBegin unorderedSuccessor() { return successor(unorderedIsTrue()); } /** * Swaps the operands to this if and reverses the condition (e.g. > goes to <=). * @see Condition#mirror() */ public void swapOperands() { condition = condition.mirror(); Value t = x(); setX(y()); setY(t); } /** * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=) * @see Condition#negate() */ public void swapSuccessors() { unorderedIsTrue = !unorderedIsTrue; condition = condition.negate(); BlockBegin t = blockSuccessor(0); BlockBegin f = blockSuccessor(1); setBlockSuccessor(0, f); setBlockSuccessor(1, t); } @Override public void accept(ValueVisitor v) { v.visitIf(this); } @Override public void print(LogStream out) { out.print("if "). print(x()). print(' '). print(condition().operator). print(' '). print(y()). print(" then B"). print(blockSuccessors().get(0).blockID). print(" else B"). print(blockSuccessors().get(1).blockID); } @Override public String shortName() { return "If " + condition.operator; } }