src/com/quemaster/transformations/mjc2wsl/MicroJavaInput.java

   1 package com.quemaster.transformations.mjc2wsl;
   2
   3 /*
   4  Copyright (C) 2014  Doni Pracner
   5
   6  This file is part of mjc2wsl.
   7
   8  mjc2wsl is free software: you can redistribute it and/or modify
   9  it under the terms of the GNU General Public License as published by
  10  the Free Software Foundation, either version 3 of the License, or
  11  (at your option) any later version.
  12
  13  mjc2wsl is distributed in the hope that it will be useful,
  14  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  GNU General Public License for more details.
  17
  18  You should have received a copy of the GNU General Public License
  19  along with mjc2wsl.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21 import java.io.BufferedReader;
  22 import java.io.IOException;
  23 import java.io.InputStream;
  24 import java.io.InputStreamReader;
  25 import java.util.HashMap;
  26
  27 public class MicroJavaInput {
  28         private HashMap<Integer, String> opMap;
  29         public String opCodeFile = "/mj-bytecodes.properties";
  30         private InputStream mainIn;
  31         int counter = -1;
  32
  33         int mainAdr;
  34
  35         int numberOfWords;
  36         private int codesize;
  37
  38         public MicroJavaInput() {
  39
  40         }
  41
  42         public int get() {
  43                 int res = -1;
  44                 try {
  45                         res = mainIn.read();
  46                         if (res >= 0)
  47                                 res = res << 24 >>> 24;
  48                 } catch (IOException ex) {
  49                         ex.printStackTrace();
  50                 }
  51                 counter++;
  52                 return res;
  53         }
  54
  55         public int get2() {
  56                 return (get() * 256 + get()) << 16 >> 16;
  57         }
  58
  59         public int get4() {
  60                 return (get2() << 16) + (get2() << 16 >>> 16);
  61         }
  62
  63         public void processHeader(mjc2wsl mjc2wsl) throws Exception {
  64                 byte m = (byte) get();
  65                 byte j = (byte) get();
  66                 if (m != 'M' || j != 'J')
  67                         throw new Exception("Wrong start of bytecode file");
  68                 codesize = get4();
  69                 setNumberOfWords(get4());
  70                 setMainAdr(get4());
  71         }
  72
  73         public void setStream(InputStream ins) {
  74                 mainIn = ins;
  75         }
  76
  77         public int getCounter() {
  78                 return counter;
  79         }
  80
  81         public int getCodesize() {
  82                 return codesize;
  83         }
  84
  85         public int getMainAdr(mjc2wsl mjc2wsl) {
  86                 return mainAdr;
  87         }
  88
  89         public int getNumberOfWords(mjc2wsl mjc2wsl) {
  90                 return numberOfWords;
  91         }
  92
  93         void setNumberOfWords(int numberOfWords) {
  94                 this.numberOfWords = numberOfWords;
  95         }
  96
  97         void setMainAdr(int mainAdr) {
  98                 this.mainAdr = mainAdr;
  99         }
 100
 101         String getRelationFor(int opcode) throws Exception {
 102                 switch (opcode) {
 103                 case mjc2wsl.jeq:
 104                         return "=";
 105                 case mjc2wsl.jne:
 106                         return "<>";
 107                 case mjc2wsl.jlt:
 108                         return "<";
 109                 case mjc2wsl.jle:
 110                         return "<=";
 111                 case mjc2wsl.jgt:
 112                         return ">";
 113                 case mjc2wsl.jge:
 114                         return ">=";
 115                 }
 116                 throw new Exception("Wrong opcode for a relation");
 117         }
 118
 119         boolean isJumpCode(int opcode) {
 120                 return (opcode >= mjc2wsl.jmp) && (opcode <= mjc2wsl.jge);
 121         }
 122
 123         private HashMap<Integer, String> getOpMap() {
 124                 if (opMap == null) {
 125                         opMap = new HashMap<Integer, String>(60, 0.98f);
 126                         try {
 127                                 BufferedReader in = new BufferedReader(new InputStreamReader(
 128                                                 getClass().getResourceAsStream(opCodeFile)));
 129                                 String str = in.readLine();
 130                                 while (str != null) {
 131                                         String[] ss = str.split("=");
 132                                         opMap.put(Integer.parseInt(ss[0]), ss[1]);
 133                                         str = in.readLine();
 134                                 }
 135                                 in.close();
 136                         } catch (Exception ex) {
 137                                 ex.printStackTrace();
 138                         }
 139                 }
 140                 return opMap;
 141         }
 142
 143         public String getOpString(int op) {
 144                 return getOpMap().get(op);
 145         }
 146
 147         public String describeOpCode(int op) {
 148                 return op + " (" + getOpString(op) + ")";
 149         }
 150
 151 }