Mercurial > hg > graal-compiler
view graal/GraalCompiler/src/com/sun/c1x/ir/IfOp.java @ 2585:3e0e65161345
new node layout: Op2
author | Lukas Stadler <lukas.stadler@jku.at> |
---|---|
date | Thu, 05 May 2011 14:12:19 +0200 |
parents | 16b9a8b5ad39 |
children | 421da5f53b5e |
line wrap: on
line source
/* * 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.sun.c1x.debug.*; import com.sun.c1x.util.*; import com.sun.cri.bytecode.*; /** * The {@code IfOp} class represents a comparison that yields one of two values. * Note that these nodes are not built directly from the bytecode but are introduced * by conditional expression elimination. * * @author Ben L. Titzer */ public final class IfOp extends Op2 { Condition cond; Value trueVal; Value falseVal; /** * Constructs a new IfOp. * @param x the instruction producing the first value to be compared * @param cond the condition of the comparison * @param y the instruction producing the second value to be compared * @param tval the value produced if the condition is true * @param fval the value produced if the condition is false */ public IfOp(Value x, Condition cond, Value y, Value tval, Value fval) { // TODO: return the appropriate bytecode IF_ICMPEQ, etc super(tval.kind.meet(fval.kind), Bytecodes.ILLEGAL, x, y); this.cond = cond; this.trueVal = tval; falseVal = fval; } /** * Gets the condition of this if operation. * @return the condition */ public Condition condition() { return cond; } /** * Gets the instruction that produces the value if the comparison is true. * @return the instruction producing the value upon true */ public Value trueValue() { return trueVal; } /** * Gets the instruction that produces the value if the comparison is false. * @return the instruction producing the value upon false */ public Value falseValue() { return falseVal; } /** * Checks whether this comparison operator is commutative (i.e. it is either == or !=). * @return {@code true} if this comparison is commutative */ public boolean isCommutative() { return cond == Condition.EQ || cond == Condition.NE; } @Override public void inputValuesDo(ValueClosure closure) { super.inputValuesDo(closure); trueVal = closure.apply(trueVal); falseVal = closure.apply(falseVal); } @Override public void accept(ValueVisitor v) { v.visitIfOp(this); } @Override public int valueNumber() { return Util.hash4(cond.hashCode(), x, y, trueVal, falseVal); } @Override public boolean valueEqual(Instruction i) { if (i instanceof IfOp) { IfOp o = (IfOp) i; return opcode == o.opcode && x == o.x && y == o.y && trueVal == o.trueVal && falseVal == o.falseVal; } return false; } @Override public void print(LogStream out) { out.print(x()). print(' '). print(condition().operator). print(' '). print(y()). print(" ? "). print(trueValue()). print(" : "). print(falseValue()); } }