org.jf.dexlib2.builder.BuilderOffsetInstruction Maven / Gradle / Ivy

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/*
 * Copyright 2013, Google Inc.
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 *
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 * modification, are permitted provided that the following conditions are
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 *
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package org.jf.dexlib2.builder;

import org.jf.dexlib2.Opcode;
import org.jf.dexlib2.iface.instruction.OffsetInstruction;
import org.jf.util.ExceptionWithContext;

import javax.annotation.Nonnull;

public abstract class BuilderOffsetInstruction extends BuilderInstruction implements OffsetInstruction {
    @Nonnull
    protected final Label target;

    public BuilderOffsetInstruction(@Nonnull Opcode opcode,
                                    @Nonnull Label target) {
        super(opcode);
        this.target = target;
    }

    @Override public int getCodeOffset() {
        int codeOffset = internalGetCodeOffset();
        if (this.getCodeUnits() == 1) {
            if (codeOffset < Byte.MIN_VALUE || codeOffset > Byte.MAX_VALUE) {
                throw new ExceptionWithContext("Invalid instruction offset: %d. " +
                        "Offset must be in [-128, 127]", codeOffset);
            }
        } else if (this.getCodeUnits() == 2) {
            if (codeOffset < Short.MIN_VALUE || codeOffset > Short.MAX_VALUE) {
                throw new ExceptionWithContext("Invalid instruction offset: %d. " +
                        "Offset must be in [-32768, 32767]", codeOffset);
            }
        }
        return codeOffset;
    }


    int internalGetCodeOffset() {
        return target.getCodeAddress() - this.getLocation().getCodeAddress();
    }

    @Nonnull
    public Label getTarget() {
        return target;
    }
}