Mercurial > hg > graal-compiler
view graal/GraalCompiler/src/com/sun/c1x/ir/Value.java @ 2829:27c00b180416
fix merge error
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 31 May 2011 09:51:59 +0200 |
parents | bd17ac598c6e |
children | bfce42cd9c07 |
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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.cri.ci.*; import com.sun.cri.ri.*; /** * This class represents a value within the HIR graph, including local variables, phis, and * all other instructions. */ public abstract class Value extends Node { /** * The kind of this value. This is {@link CiKind#Void} for instructions that produce no value. * This kind is guaranteed to be a {@linkplain CiKind#stackKind() stack kind}. */ public final CiKind kind; private boolean isNonNull; protected CiValue operand = CiValue.IllegalValue; /** * Creates a new value with the specified kind. * @param kind the type of this value * @param inputCount * @param successorCount * @param graph */ public Value(CiKind kind, int inputCount, int successorCount, Graph graph) { super(inputCount, successorCount, graph); assert kind == kind.stackKind() : kind + " != " + kind.stackKind(); this.kind = kind; } /////////////// // TODO: remove when Value class changes are completed @Override protected Object clone() throws CloneNotSupportedException { throw new CloneNotSupportedException(); } /** * Checks whether this instruction produces a value which is guaranteed to be non-null. * @return {@code true} if this instruction's value is not null */ public boolean isNonNull() { return isNonNull; } public void setNonNull(boolean isNonNull) { this.isNonNull = isNonNull; } /** * Checks whether this value is a constant (i.e. it is of type {@link Constant}. * @return {@code true} if this value is a constant */ public final boolean isConstant() { return this instanceof Constant; } /** * Checks whether this value represents the null constant. * @return {@code true} if this value represents the null constant */ public final boolean isNullConstant() { return this instanceof Constant && ((Constant) this).value.isNull(); } /** * Convert this value to a constant if it is a constant, otherwise return null. * @return the {@link CiConstant} represented by this value if it is a constant; {@code null} * otherwise */ public final CiConstant asConstant() { if (this instanceof Constant) { return ((Constant) this).value; } return null; } /** * Gets the LIR operand associated with this instruction. * @return the LIR operand for this instruction */ public final CiValue operand() { return operand; } /** * Sets the LIR operand associated with this instruction. * @param operand the operand to associate with this instruction */ public final void setOperand(CiValue operand) { assert this.operand.isIllegal() : "operand cannot be set twice"; assert operand != null && operand.isLegal() : "operand must be legal"; assert operand.kind.stackKind() == this.kind; this.operand = operand; } /** * Clears the LIR operand associated with this instruction. */ public final void clearOperand() { this.operand = CiValue.IllegalValue; } /** * Computes the exact type of the result of this instruction, if possible. * @return the exact type of the result of this instruction, if it is known; {@code null} otherwise */ public RiType exactType() { return null; // default: unknown exact type } /** * Computes the declared type of the result of this instruction, if possible. * @return the declared type of the result of this instruction, if it is known; {@code null} otherwise */ public RiType declaredType() { return null; // default: unknown declared type } /** * Apply the specified closure to all the input values of this instruction. * @param closure the closure to apply */ public void inputValuesDo(ValueClosure closure) { for (int i = 0; i < inputs().size(); i++) { inputs().set(i, closure.apply((Value) inputs().get(i))); } for (int i = 0; i < successors().size(); i++) { successors().set(i, closure.apply((Value) successors().get(i))); } } @Override public String toString() { StringBuilder builder = new StringBuilder(); builder.append("#"); builder.append(id()); builder.append(' '); if (id() < 10) { builder.append(' '); } builder.append(getClass().getSimpleName()); builder.append(" [").append(flagsToString()).append("]"); return builder.toString(); } public String flagsToString() { StringBuilder sb = new StringBuilder(); if (isNonNull()) { sb.append("NonNull"); } return sb.toString(); } /** * Compute the value number of this Instruction. Local and global value numbering * optimizations use a hash map, and the value number provides a hash code. * If the instruction cannot be value numbered, then this method should return * {@code 0}. * @return the hashcode of this instruction */ public int valueNumber() { return 0; } /** * Checks that this instruction is equal to another instruction for the purposes * of value numbering. * @param i the other instruction * @return {@code true} if this instruction is equivalent to the specified * instruction w.r.t. value numbering */ public boolean valueEqual(Node i) { return false; } /** * This method supports the visitor pattern by accepting a visitor and calling the * appropriate {@code visit()} method. * * @param v the visitor to accept */ public abstract void accept(ValueVisitor v); public abstract void print(LogStream out); }