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      1 /*
      2  * Copyright 2013, Google Inc.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 package org.jf.dexlib2.builder;
     33 
     34 import org.jf.dexlib2.Opcode;
     35 import org.jf.dexlib2.iface.instruction.OffsetInstruction;
     36 import org.jf.util.ExceptionWithContext;
     37 
     38 import javax.annotation.Nonnull;
     39 
     40 public abstract class BuilderOffsetInstruction extends BuilderInstruction implements OffsetInstruction {
     41     @Nonnull
     42     protected final Label target;
     43 
     44     public BuilderOffsetInstruction(@Nonnull Opcode opcode,
     45                                     @Nonnull Label target) {
     46         super(opcode);
     47         this.target = target;
     48     }
     49 
     50     @Override public int getCodeOffset() {
     51         int codeOffset = internalGetCodeOffset();
     52         if (this.getCodeUnits() == 1) {
     53             if (codeOffset < Byte.MIN_VALUE || codeOffset > Byte.MAX_VALUE) {
     54                 throw new ExceptionWithContext("Invalid instruction offset: %d. " +
     55                         "Offset must be in [-128, 127]", codeOffset);
     56             }
     57         } else if (this.getCodeUnits() == 2) {
     58             if (codeOffset < Short.MIN_VALUE || codeOffset > Short.MAX_VALUE) {
     59                 throw new ExceptionWithContext("Invalid instruction offset: %d. " +
     60                         "Offset must be in [-32768, 32767]", codeOffset);
     61             }
     62         }
     63         return codeOffset;
     64     }
     65 
     66 
     67     int internalGetCodeOffset() {
     68         return target.getCodeAddress() - this.getLocation().getCodeAddress();
     69     }
     70 
     71     @Nonnull
     72     public Label getTarget() {
     73         return target;
     74     }
     75 }
     76