Mem.java

/**
 * Copyright 2013, Landz and its contributors. All rights reserved.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package jnr.x86asm;

import static jnr.x86asm.REG.*;
import static jnr.x86asm.SEGMENT.*;

/**
 *
 */
public final class Mem extends Operand {
    //! @brief Base register index, see @c REG.
    private final int base;
    //! @brief Index register index, see @c REG.
    private final int index;
    //! @brief Index register shift (0 to 3 included).
    private final int shift;
    //! @brief Segment override prefix, see @c AsmJit::SEGMENT.
    private final SEGMENT segmentPrefix;
    
    private final Label label;
    private final long target;

    private final long displacement;

    
    Mem(Label label, long displacement, int size) {
        this(NO_REG, NO_REG, 0, SEGMENT_NONE, label, 0, displacement, size);
    }

    Mem(Register base, long displacement, int size) {
        this(base.index(), NO_REG, 0, SEGMENT_NONE, null, 0, displacement, size);
    }

    Mem(Register base, Register index, int shift, long displacement, int size) {
        this(base.index(), index.index(), shift, SEGMENT_NONE, null, 0, displacement, size);
    }

    Mem(Label label, Register index, int shift, long disp, int ptrSize) {
        this(0, index.index(), shift, SEGMENT_NONE, label, 0, disp, ptrSize);
    }

    Mem(long target, long disp, SEGMENT segmentPrefix, int ptrSize) {
        this(NO_REG, NO_REG, 0, segmentPrefix, null, target, disp, ptrSize);
    }

    Mem(long target, Register index, int shift, SEGMENT segmentPrefix, long disp, int ptrSize) {
        this(NO_REG, index.index(), shift, segmentPrefix, null, target, disp, ptrSize);
    }
    
    private Mem(int base, int index, int shift, SEGMENT segmentPrefix, Label label, long target, long displacement, int size) {
        super(OP.OP_MEM, size);

        assert(shift <= 3);

        this.base = base;
        this.index = index;
        this.shift = shift;
        this.segmentPrefix = segmentPrefix;
        this.label = label;
        this.target = target;
        this.displacement = displacement;
    }

    public final boolean hasLabel() {
        return label != null;
    }

    //! @brief Return if address has base register.
    public final boolean hasBase() {
        return base != NO_REG;
    }

    //! @brief Return if address has index register.
    boolean hasIndex() {
        return index != NO_REG;
    }

    public final SEGMENT segmentPrefix() {
        return segmentPrefix;
    }

    public final int base() {
        return base;
    }


    public final long displacement() {
        return displacement;
    }

    public final int index() {
        return index;
    }

    public final Label label() {
        return label;
    }

    public final int shift() {
        return shift;
    }

    public final long target() {
        return target;
    }

}