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      1 /*
      2  * [The "BSD licence"]
      3  * Copyright (c) 2010 Ben Gruver (JesusFreke)
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 package org.jf.baksmali.Adaptors;
     30 
     31 import org.jf.baksmali.BaksmaliOptions;
     32 import org.jf.util.IndentingWriter;
     33 
     34 import javax.annotation.Nonnull;
     35 import java.io.IOException;
     36 
     37 /**
     38  * This class contains the logic used for formatting registers
     39  */
     40 public class RegisterFormatter {
     41     @Nonnull public final BaksmaliOptions options;
     42     public final int registerCount;
     43     public final int parameterRegisterCount;
     44 
     45     public RegisterFormatter(@Nonnull BaksmaliOptions options, int registerCount, int parameterRegisterCount) {
     46         this.options = options;
     47         this.registerCount = registerCount;
     48         this.parameterRegisterCount = parameterRegisterCount;
     49     }
     50 
     51     /**
     52      * Write out the register range value used by Format3rc. If baksmali.noParameterRegisters is true, it will always
     53      * output the registers in the v<n> format. But if false, then it will check if *both* registers are parameter
     54      * registers, and if so, use the p<n> format for both. If only the last register is a parameter register, it will
     55      * use the v<n> format for both, otherwise it would be confusing to have something like {v20 .. p1}
     56      * @param writer the <code>IndentingWriter</code> to write to
     57      * @param startRegister the first register in the range
     58      * @param lastRegister the last register in the range
     59      */
     60     public void writeRegisterRange(IndentingWriter writer, int startRegister, int lastRegister) throws IOException {
     61         if (options.parameterRegisters) {
     62             assert startRegister <= lastRegister;
     63 
     64             if (startRegister >= registerCount - parameterRegisterCount) {
     65                 writer.write("{p");
     66                 writer.printSignedIntAsDec(startRegister - (registerCount - parameterRegisterCount));
     67                 writer.write(" .. p");
     68                 writer.printSignedIntAsDec(lastRegister - (registerCount - parameterRegisterCount));
     69                 writer.write('}');
     70                 return;
     71             }
     72         }
     73         writer.write("{v");
     74         writer.printSignedIntAsDec(startRegister);
     75         writer.write(" .. v");
     76         writer.printSignedIntAsDec(lastRegister);
     77         writer.write('}');
     78     }
     79 
     80     /**
     81      * Writes a register with the appropriate format. If baksmali.noParameterRegisters is true, then it will always
     82      * output a register in the v<n> format. If false, then it determines if the register is a parameter register,
     83      * and if so, formats it in the p<n> format instead.
     84      *
     85      * @param writer the <code>IndentingWriter</code> to write to
     86      * @param register the register number
     87      */
     88     public void writeTo(IndentingWriter writer, int register) throws IOException {
     89         if (options.parameterRegisters) {
     90             if (register >= registerCount - parameterRegisterCount) {
     91                 writer.write('p');
     92                 writer.printSignedIntAsDec((register - (registerCount - parameterRegisterCount)));
     93                 return;
     94             }
     95         }
     96         writer.write('v');
     97         writer.printSignedIntAsDec(register);
     98     }
     99 }
    100