Mercurial > hg > graal-compiler
view graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/Address.java @ 5552:69a8969dbf40
Reduce public fields in api.code project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 09 Jun 2012 21:50:02 +0200 |
parents | b6617d13ea44 |
children | a1db0ea58b53 |
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/* * Copyright (c) 2010, 2012, 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.oracle.graal.api.code; import static com.oracle.graal.api.code.ValueUtil.*; import com.oracle.graal.api.meta.*; /** * Represents an address in target machine memory, specified via some combination of a base register, an index register, * a displacement and a scale. Note that the base and index registers may be a variable that will get a register assigned * later by the register allocator. */ public final class Address extends Value { private static final long serialVersionUID = -1003772042519945089L; /** * A sentinel value used as a place holder in an instruction stream for an address that will be patched. */ public static final Address Placeholder = new Address(Kind.Illegal, Value.IllegalValue); private Value base; private Value index; private final Scale scale; private final int displacement; /** * Creates a {@code CiAddress} with given base register, no scaling and no displacement. * @param kind the kind of the value being addressed * @param base the base register */ public Address(Kind kind, Value base) { this(kind, base, IllegalValue, Scale.Times1, 0); } /** * Creates a {@code CiAddress} with given base register, no scaling and a given displacement. * @param kind the kind of the value being addressed * @param base the base register * @param displacement the displacement */ public Address(Kind kind, Value base, int displacement) { this(kind, base, IllegalValue, Scale.Times1, displacement); } /** * Creates a {@code CiAddress} with given base and index registers, scaling and displacement. * This is the most general constructor.. * @param kind the kind of the value being addressed * @param base the base register * @param index the index register * @param scale the scaling factor * @param displacement the displacement */ public Address(Kind kind, Value base, Value index, Scale scale, int displacement) { super(kind); this.setBase(base); this.setIndex(index); this.scale = scale; this.displacement = displacement; assert !isConstant(base) && !isStackSlot(base); assert !isConstant(index) && !isStackSlot(index); } /** * A scaling factor used in complex addressing modes such as those supported by x86 platforms. */ public enum Scale { Times1(1, 0), Times2(2, 1), Times4(4, 2), Times8(8, 3); private Scale(int value, int log2) { this.value = value; this.log2 = log2; } /** * The value (or multiplier) of this scale. */ public final int value; /** * The {@linkplain #value value} of this scale log 2. */ public final int log2; public static Scale fromInt(int scale) { switch (scale) { case 1: return Times1; case 2: return Times2; case 4: return Times4; case 8: return Times8; default: throw new IllegalArgumentException(String.valueOf(scale)); } } } @Override public String toString() { if (this == Placeholder) { return "[<placeholder>]"; } StringBuilder s = new StringBuilder(); s.append(kind.javaName).append("["); String sep = ""; if (isLegal(getBase())) { s.append(getBase()); sep = " + "; } if (isLegal(getIndex())) { s.append(sep).append(getIndex()).append(" * ").append(getScale().value); sep = " + "; } if (getDisplacement() < 0) { s.append(" - ").append(-getDisplacement()); } else if (getDisplacement() > 0) { s.append(sep).append(getDisplacement()); } s.append("]"); return s.toString(); } @Override public boolean equals(Object obj) { if (obj instanceof Address) { Address addr = (Address) obj; return kind == addr.kind && getDisplacement() == addr.getDisplacement() && getBase().equals(addr.getBase()) && getScale() == addr.getScale() && getIndex().equals(addr.getIndex()); } return false; } @Override public int hashCode() { return getBase().hashCode() ^ getIndex().hashCode() ^ (getDisplacement() << 4) ^ (getScale().value << 8) ^ (kind.ordinal() << 12); } /** * @return Base register that defines the start of the address computation. * If not present, is denoted by {@link Value#IllegalValue}. */ public Value getBase() { return base; } public void setBase(Value base) { this.base = base; } /** * @return Index register, the value of which (possibly scaled by {@link #scale}) is added to {@link #base}. * If not present, is denoted by {@link Value#IllegalValue}. */ public Value getIndex() { return index; } public void setIndex(Value index) { this.index = index; } /** * @return Scaling factor for indexing, dependent on target operand size. */ public Scale getScale() { return scale; } /** * @return Optional additive displacement. */ public int getDisplacement() { return displacement; } }