Mercurial > hg > truffle
view graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiAddress.java @ 5458:7accd1838b1b
quick fix for postdominator calculation
author | Lukas Stadler <lukas.stadler@jku.at> |
---|---|
date | Thu, 31 May 2012 18:23:16 +0200 |
parents | 9ce8594bedaf |
children | 438ab53efdd0 |
line wrap: on
line source
/* * 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.max.cri.ci; import static com.oracle.max.cri.ci.CiValueUtil.*; /** * 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 CiAddress extends CiValue { 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 CiAddress Placeholder = new CiAddress(CiKind.Illegal, CiValue.IllegalValue); /** * Base register that defines the start of the address computation. * If not present, is denoted by {@link CiValue#IllegalValue}. */ public CiValue base; /** * Index register, the value of which (possibly scaled by {@link #scale}) is added to {@link #base}. * If not present, is denoted by {@link CiValue#IllegalValue}. */ public CiValue index; /** * Scaling factor for indexing, dependent on target operand size. */ public final Scale scale; /** * Optional additive displacement. */ public 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 CiAddress(CiKind kind, CiValue 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 CiAddress(CiKind kind, CiValue 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 CiAddress(CiKind kind, CiValue base, CiValue index, Scale scale, int displacement) { super(kind); this.base = base; this.index = 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(base)) { s.append(base); sep = " + "; } if (isLegal(index)) { s.append(sep).append(index).append(" * ").append(scale.value); sep = " + "; } if (displacement < 0) { s.append(" - ").append(-displacement); } else if (displacement > 0) { s.append(sep).append(displacement); } s.append("]"); return s.toString(); } @Override public boolean equals(Object obj) { if (obj instanceof CiAddress) { CiAddress addr = (CiAddress) obj; return kind == addr.kind && displacement == addr.displacement && base.equals(addr.base) && scale == addr.scale && index.equals(addr.index); } return false; } @Override public int hashCode() { return base.hashCode() ^ index.hashCode() ^ (displacement << 4) ^ (scale.value << 8) ^ (kind.ordinal() << 12); } }