Mercurial > hg > graal-compiler
diff graal/GraalCompiler/src/com/sun/c1x/ir/IfOp.java @ 2509:16b9a8b5ad39
Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
---|---|
date | Wed, 27 Apr 2011 11:50:44 +0200 |
parents | graal/Compiler/src/com/sun/c1x/ir/IfOp.java@9ec15d6914ca |
children | 421da5f53b5e |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/GraalCompiler/src/com/sun/c1x/ir/IfOp.java Wed Apr 27 11:50:44 2011 +0200 @@ -0,0 +1,128 @@ +/* + * 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()); + } +}