--- /dev/null 2016-05-31 09:42:47.975716356 -0700 +++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.asm.amd64/src/org/graalvm/compiler/asm/amd64/AMD64Address.java 2016-12-09 00:46:46.337130211 -0800 @@ -0,0 +1,197 @@ +/* + * Copyright (c) 2010, 2015, 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 org.graalvm.compiler.asm.amd64; + +import jdk.vm.ci.code.Register; + +import org.graalvm.compiler.asm.AbstractAddress; + +/** + * 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 AMD64Address extends AbstractAddress { + + private final Register base; + private final Register index; + private final Scale scale; + private final int displacement; + + /** + * The start of the instruction, i.e., the value that is used as the key for looking up + * placeholder patching information. Only used for {@link AMD64Assembler#getPlaceholder + * placeholder addresses}. + */ + final int instructionStartPosition; + + /** + * Creates an {@link AMD64Address} with given base register, no scaling and no displacement. + * + * @param base the base register + */ + public AMD64Address(Register base) { + this(base, Register.None, Scale.Times1, 0); + } + + /** + * Creates an {@link AMD64Address} with given base register, no scaling and a given + * displacement. + * + * @param base the base register + * @param displacement the displacement + */ + public AMD64Address(Register base, int displacement) { + this(base, Register.None, Scale.Times1, displacement); + } + + /** + * Creates an {@link AMD64Address} with given base and index registers, scaling and + * displacement. This is the most general constructor. + * + * @param base the base register + * @param index the index register + * @param scale the scaling factor + * @param displacement the displacement + */ + public AMD64Address(Register base, Register index, Scale scale, int displacement) { + this(base, index, scale, displacement, -1); + } + + AMD64Address(Register base, Register index, Scale scale, int displacement, int instructionStartPosition) { + this.base = base; + this.index = index; + this.scale = scale; + this.displacement = displacement; + this.instructionStartPosition = instructionStartPosition; + + assert scale != null; + } + + /** + * A scaling factor used in the SIB addressing mode. + */ + public enum Scale { + Times1(1, 0), + Times2(2, 1), + Times4(4, 2), + Times8(8, 3); + + 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: + return null; + } + } + + public static Scale fromShift(int shift) { + switch (shift) { + case 0: + return Times1; + case 1: + return Times2; + case 2: + return Times4; + case 3: + return Times8; + default: + return null; + } + } + } + + @Override + public String toString() { + StringBuilder s = new StringBuilder(); + s.append("["); + String sep = ""; + if (!getBase().equals(Register.None)) { + s.append(getBase()); + sep = " + "; + } + if (!getIndex().equals(Register.None)) { + 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(); + } + + /** + * @return Base register that defines the start of the address computation. If not present, is + * denoted by {@link Register#None}. + */ + public Register getBase() { + return base; + } + + /** + * @return Index register, the value of which (possibly scaled by {@link #getScale}) is added to + * {@link #getBase}. If not present, is denoted by {@link Register#None}. + */ + public Register getIndex() { + return 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; + } +}