Mercurial > hg > graal-compiler
view graal/GraalCompiler/src/com/sun/c1x/ir/If.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/If.java@9ec15d6914ca |
children | 4a016ff4d2df |
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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.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. * * @author Ben L. Titzer */ public final class If extends BlockEnd { Value x; Value y; Condition condition; /** * Constructs a new If instruction. * @param x the instruction producing the first input to the instruction * @param cond the condition (comparison operation) * @param unorderedIsTrue {@code true} if unordered is treated as true (floating point operations) * @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 */ public If(Value x, Condition cond, boolean unorderedIsTrue, Value y, BlockBegin trueSucc, BlockBegin falseSucc, FrameState stateAfter, boolean isSafepoint) { super(CiKind.Illegal, stateAfter, isSafepoint); this.x = x; this.y = y; condition = cond; assert Util.archKindsEqual(x, y); initFlag(Flag.UnorderedIsTrue, unorderedIsTrue); successors.add(trueSucc); successors.add(falseSucc); } /** * Gets the instruction that produces the first input to this comparison. * @return the instruction producing the first input */ public Value x() { return x; } /** * Gets the instruction that produces the second input to this comparison. * @return the instruction producing the second input */ public Value y() { return y; } /** * 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 checkFlag(Flag.UnorderedIsTrue); } /** * Gets the block corresponding to the true successor. * @return the true successor */ public BlockBegin trueSuccessor() { return successors.get(0); } /** * Gets the block corresponding to the false successor. * @return the false successor */ public BlockBegin falseSuccessor() { return successors.get(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 successors.get(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; x = y; y = t; } /** * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=) * @see Condition#negate() */ public void swapSuccessors() { setFlag(Flag.UnorderedIsTrue, !unorderedIsTrue()); condition = condition.negate(); BlockBegin t = successors.get(0); BlockBegin f = successors.get(1); successors.set(0, f); successors.set(1, t); } @Override public void inputValuesDo(ValueClosure closure) { x = closure.apply(x); y = closure.apply(y); } @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(successors().get(0).blockID). print(" else B"). print(successors().get(1).blockID); if (isSafepoint()) { out.print(" (safepoint)"); } } }