src/mjc2wsl.java

   1 import java.io.*;
   2 import java.util.*;
   3
   4 /**
   5  * This program converts file from compiled MicroJava bytecode to WSL language
   6  * which is a part of the FermaT Transformation system. MicroJava is a subset
   7  * used in Compiler Construction courses by Hanspeter Moessenboeck, not
   8  * "Java ME".
   9  *
  10  * @author Doni Pracner, http://perun.dmi.rs/pracner http://quemaster.com
  11  */
  12 public class mjc2wsl{
  13         public static String versionN = "0.1.4";
  14
  15         public static final int M_ERR = 2, M_WAR = 1, M_DEB = 0;
  16
  17         private int printLevel = M_ERR;
  18
  19         private int[] messageCounters = new int[M_ERR+1];
  20
  21         private void message(String mes, int level){
  22                         if (level>=printLevel)
  23                                         System.out.println(mes);
  24                         messageCounters[level]++;
  25         }
  26
  27         private void printMessageCounters(){
  28                         printMessageCounters(System.out);
  29         }
  30
  31         private void printMessageCounters(PrintStream out){
  32                         out.println("total errors:"+messageCounters[M_ERR]+" warnings:"+messageCounters[M_WAR]);
  33         }
  34
  35         private boolean genPauseAfterEachAddress=false,
  36                 genPrintForEachAddress = false,
  37                 genPrintEStackOnChange = false;
  38
  39         /** Constant used for marking a regular comment from the original file */
  40         public static final char C_REG = ' ';
  41         /**
  42          * Constant used for marking when original code is inserted in the file,
  43          * next to the translations
  44          */
  45         public static final char C_OC = '#';
  46         /** Constant used for marking special messages from the translator */
  47         public static final char C_SPEC = '&';
  48         /** Constant used for marking error messages from the translator */
  49         public static final char C_ERR = '!';
  50
  51         /** instruction code in MicroJava bytecode. */
  52         public static final int
  53                 load        =  1,
  54                 load_0      =  2,
  55                 load_1      =  3,
  56                 load_2      =  4,
  57                 load_3      =  5,
  58                 store       =  6,
  59                 store_0     =  7,
  60                 store_1     =  8,
  61                 store_2     =  9,
  62                 store_3     = 10,
  63                 getstatic   = 11,
  64                 putstatic   = 12,
  65                 getfield    = 13,
  66                 putfield    = 14,
  67                 const_0     = 15,
  68                 const_1     = 16,
  69                 const_2     = 17,
  70                 const_3     = 18,
  71                 const_4     = 19,
  72                 const_5     = 20,
  73                 const_m1    = 21,
  74                 const_      = 22,
  75                 add         = 23,
  76                 sub         = 24,
  77                 mul         = 25,
  78                 div         = 26,
  79                 rem         = 27,
  80                 neg         = 28,
  81                 shl         = 29,
  82                 shr         = 30,
  83                 inc         = 31,
  84                 new_        = 32,
  85                 newarray    = 33,
  86                 aload       = 34,
  87                 astore      = 35,
  88                 baload      = 36,
  89                 bastore     = 37,
  90                 arraylength = 38,
  91                 pop         = 39,
  92                 dup         = 40,
  93                 dup2        = 41,
  94                 jmp         = 42,
  95                 jeq         = 43,
  96                 jne         = 44,
  97                 jlt         = 45,
  98                 jle         = 46,
  99                 jgt         = 47,
 100                 jge         = 48,
 101                 call        = 49,
 102                 return_     = 50,
 103                 enter       = 51,
 104                 exit        = 52,
 105                 read        = 53,
 106                 print       = 54,
 107                 bread       = 55,
 108                 bprint      = 56,
 109                 trap            = 57;
 110
 111         public String getStandardStart(){
 112                 StringBuilder ret = new StringBuilder(
 113                         "C:\" This file automatically converted from microjava bytecode\";\n"
 114                         +"C:\" with mjc2wsl v "+versionN+"\";\n");
 115
 116                 ret.append("VAR < tempa := 0, tempb := 0, tempres :=0,\n\t");
 117                 for (int i = 0; i <= 3; i++)
 118                         ret.append(loc(i) + " := 0, ");
 119                 ret.append("\n  mjvm_estack := < >, mjvm_mstack := < >, ");
 120                 ret.append("\n  mjvm_fp := 0, mjvm_sp := 0,");
 121                 ret.append("\n  t_e_m_p := 0 > :");
 122
 123                 return ret.toString();
 124         }
 125
 126         public String getStandardEnd(){
 127                 return "SKIP\nENDVAR";
 128         }
 129
 130         private boolean originalInComments = false;
 131
 132         private HashMap<Integer,String> opMap = null;
 133
 134         private String opCodeFile = "mj-bytecodes.properties";
 135
 136         private HashMap<Integer,String> getOpMap() {
 137                         if (opMap==null) {
 138                                         opMap = new HashMap<Integer, String> (60, 0.98f);
 139                                         try{
 140                                         BufferedReader in = new BufferedReader(
 141                                                         new InputStreamReader(getClass().getResourceAsStream(opCodeFile)));
 142                                         String str = in.readLine();
 143                                         while (str != null) {
 144                                                         String[] ss = str.split("=");
 145                                                         opMap.put(Integer.parseInt(ss[0]),ss[1]);
 146                                                         str = in.readLine();
 147                                         }
 148                                         in.close();
 149                                         }catch (Exception ex) {
 150                                                 ex.printStackTrace();
 151                                         }
 152                         }
 153                         return opMap;
 154         }
 155
 156         public String getOpString(int op) {
 157                         return getOpMap().get(op);
 158         }
 159
 160         public String describeOpCode(int op) {
 161                         return op + " (" + getOpString(op) + ")";
 162         }
 163
 164         private InputStream mainIn;
 165         private PrintWriter out = null;
 166         private int counter = -1;
 167
 168         private void pr(int i){
 169                         out.print(i);
 170         }
 171
 172         private void pr(char i){
 173                         out.print(i);
 174         }
 175
 176         private void pr(String i){
 177                         out.print(i);
 178         }
 179
 180         private void prl(String i){
 181                         out.println(i);
 182         }
 183
 184         private int get() {
 185                 int res = -1;
 186                 try {
 187                         res = mainIn.read();
 188                         if (res >= 0)
 189                                 res = res << 24 >>> 24;
 190                 } catch (IOException ex) {
 191                         ex.printStackTrace();
 192                 }
 193                 counter++;
 194                 return res;
 195         }
 196
 197         private int get2() {
 198                 return (get() * 256 + get()) << 16 >> 16;
 199         }
 200
 201         private int get4() {
 202                 return (get2() << 16) + (get2() << 16 >>> 16);
 203         }
 204
 205         private String loc(int i){
 206                 return "mjvm_loc" + i;
 207         }
 208
 209         /**
 210          * Creates a WSL comment with care to quote chars.
 211          */
 212         public static String createComment(String str){
 213                 return createComment(str, C_REG);
 214         }
 215
 216         /**
 217          * Creates a WSL comment with care to quote chars, of the
 218          * given type.  Types are given as char constants. They can be
 219          * default comments, comments that contain the original code
 220          * in them, or additional comments regarding the translation
 221          * process.
 222          */
 223         public static String createComment(String str, char type) {
 224                 return "C:\"" + type + str.replace("\"", "''") + "\";";
 225         }
 226
 227         //Expression stack
 228
 229         private String cmdToEStack(int i) {
 230                 String res = "mjvm_estack := <" + i + " > ++ mjvm_estack;";
 231                 if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
 232                 return res;
 233         }
 234
 235         private String cmdToEStack(String i) {
 236                 String res = "mjvm_estack := <" + i + " > ++ mjvm_estack;";
 237                 if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
 238                 return res;
 239         }
 240
 241         private String cmdFromEStack(String st) {
 242                 String res = st + " := HEAD(mjvm_estack); mjvm_estack := TAIL(mjvm_estack);";
 243                 if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
 244                 return res;
 245         }
 246
 247         private String getTopTwo(){
 248                 return cmdFromEStack("tempa") + "\n" + cmdFromEStack("tempb");
 249         }
 250
 251         private String getTop() {
 252                 return cmdFromEStack("tempa");
 253         }
 254
 255         //Method stack
 256
 257         private String cmdToMStack(int i) {
 258                 return "mjvm_mstack := <" + i + " > ++ mjvm_mstack;";
 259         }
 260
 261         private String cmdToMStack(String i) {
 262                 return "mjvm_mstack := <" + i + " > ++ mjvm_mstack;";
 263         }
 264
 265         private String cmdFromMStack(String st) {
 266                 return st + " := HEAD(mjvm_mstack); mjvm_mstack := TAIL(mjvm_mstack);";
 267         }
 268
 269         private String getRelationFor(int opcode) throws Exception {
 270                         switch (opcode) {
 271                                         case jeq: return "=";
 272                                         case jne: return "<>";
 273                                         case jlt: return "<";
 274                                         case jle: return "<=";
 275                                         case jgt: return ">";
 276                                         case jge: return ">=";
 277                         }
 278                         throw new Exception("Wrong opcode for a relation");
 279         }
 280
 281         private boolean isJumpCode(int opcode) {
 282                         return (opcode>=jmp) && (opcode<=jge);
 283         }
 284
 285         public void convertStream(InputStream ins) throws Exception{
 286                 mainIn = ins;
 287                 //process start
 288                 byte m = (byte) get();
 289                 byte j = (byte) get();
 290                 if (m!='M' || j !='J')
 291                                 throw new Exception("Wrong start of bytecode file");
 292                 int codesize = get4();
 293                 int numberOfWords = get4();
 294                 int mainAdr = get4();
 295
 296                 prl(getStandardStart());
 297                 prl("SKIP;\n ACTIONS A_S_start:\n A_S_start == CALL a"+(14+mainAdr)+" END");
 298                 int op = get();
 299                 while (op >= 0) {
 300                         if (originalInComments)
 301                                 prl(createComment(describeOpCode(op), C_OC));
 302                         prl("a" + counter + " == ");
 303                         if (genPrintForEachAddress) {
 304                                         prl("PRINT(\"a"+counter+"\");");
 305                                         if (genPauseAfterEachAddress)
 306                                                         prl("debug_disposable_string := @Read_Line(Standard_Input_Port);");
 307                         }
 308                         switch (op) {
 309                         case load: {
 310                                 prl(cmdToEStack(loc(get())));
 311                                 break;
 312                         }
 313                         case load_0:
 314                         case load_1:
 315                         case load_2:
 316                         case load_3: {
 317                                 prl(cmdToEStack(loc(op - load_0)));
 318                                 break;
 319                         }
 320                         case store: {
 321                                 prl(cmdFromEStack(loc(get())));
 322                                 break;
 323                         }
 324                         case store_0:
 325                         case store_1:
 326                         case store_2:
 327                         case store_3: {
 328                                 prl(cmdFromEStack(loc(op - store_0)));
 329                                 break;
 330                         }
 331
 332                         //TODO getstatic, putstatic
 333                         //TODO getfield, putfield
 334
 335                         case const_: {
 336                                 prl(cmdToEStack(get4()));
 337                                 break;
 338                         }
 339
 340                         case const_0:
 341                         case const_1:
 342                         case const_2:
 343                         case const_3:
 344                         case const_4:
 345                         case const_5: {
 346                                 prl(cmdToEStack(op - const_0));
 347                                 break;
 348                         }
 349
 350                         case add: {
 351                                 prl(getTopTwo());
 352                                 prl("tempres := tempb + tempa;");
 353                                 prl(cmdToEStack("tempres"));
 354                                 break;
 355                         }
 356                         case sub: {
 357                                 prl(getTopTwo());
 358                                 prl("tempres := tempb - tempa;");
 359                                 prl(cmdToEStack("tempres"));
 360                                 break;
 361                         }
 362                         case mul: {
 363                                 prl(getTopTwo());
 364                                 prl("tempres := tempb * tempa;");
 365                                 prl(cmdToEStack("tempres"));
 366                                 break;
 367                         }
 368                         case div: {
 369                                 prl(getTopTwo());
 370                                 prl("IF tempa = 0 THEN ERROR(\"division by zero\") FI;");
 371                                 prl("tempres := tempb DIV tempa;");
 372                                 prl(cmdToEStack("tempres"));
 373                                 break;
 374                         }
 375                         case rem: {
 376                                 prl(getTopTwo());
 377                                 prl("IF tempa = 0 THEN ERROR(\"division by zero\") FI;");
 378                                 prl("tempres := tempb MOD tempa;");
 379                                 prl(cmdToEStack("tempres"));
 380                                 break;
 381                         }
 382
 383                         //TODO neg, shl, shr, inc
 384                         //TODO new_ newarray
 385                         //TODO aload, asstore, baload, bastore
 386                         //TODO arraylength
 387                         //TODO pop, dup, dup2
 388
 389                         case jmp: {
 390                                 prl("CALL a" + (counter + get2()) + ";");
 391                                 break;
 392                         }
 393
 394                         case jeq:
 395                         case jne:
 396                         case jlt:
 397                         case jle:
 398                         case jgt:
 399                         case jge: {
 400                                 prl(getTopTwo());
 401                                 prl("IF tempb "+ getRelationFor(op)
 402                                                 +" tempa THEN CALL a" + (counter + get2())
 403                                                 +" ELSE CALL a" + (counter+1)
 404                                                 + " FI;");
 405                                 break;
 406                         }
 407
 408                         case call: {
 409                                 prl(cmdToMStack(counter+2));
 410                                 prl("CALL a" + (counter + get2()) + ";");
 411                                 break;
 412                         }
 413
 414                         case return_: {
 415                                 prl("IF EMPTY?(mjvm_mstack) THEN CALL Z ELSE");
 416                                 //else we let things return
 417                                 prl(cmdFromMStack("tempa"));
 418                                 prl("SKIP FI");
 419                                 prl("END b"+counter+" ==");
 420                                 break;
 421                         }
 422                         case enter: {
 423                                 prl(createComment("enter not fully procesed yet"));
 424                                 message("enter not fully procesed yet", M_WAR);
 425                                 int parameters = get();
 426
 427                                 get();
 428                                 for (int i = parameters-1; i >= 0; i--)
 429                                                 prl(cmdFromEStack(loc(i)));
 430                                 break;
 431                         }
 432                         case exit: {
 433                                 prl(createComment("exit not fully procesed yet"));
 434                                 message("exit not fully procesed yet", M_WAR);
 435                                 break;
 436                         }
 437
 438                         //TODO read, print
 439                         case read: {
 440                                 prl("tempa := @String_To_Num(@Read_Line(Standard_Input_Port));");
 441                                 prl(cmdToEStack("tempa"));
 442                                 break;
 443                         }
 444
 445                         // the prints
 446                         case bprint: {
 447                                 prl(getTopTwo());
 448                                 prl("PRINT(tempb);");
 449                                 break;
 450                         }
 451                         case print: {
 452                                 // TODO need to make it a char
 453                                 prl(getTopTwo());
 454                                 prl("PRINT(tempb);");
 455                                 break;
 456                         }
 457
 458                         case trap: {
 459                                 prl("ERROR(\"Runtime error: trap("+get()+")\");");
 460                                 break;
 461                         }
 462
 463
 464                         default:
 465                                 prl(createComment("unknown op error: " + op, C_ERR));
 466                                 message("unknown op error: "+ op, M_ERR);
 467                                 break;
 468                         }
 469
 470                         boolean wasJump = isJumpCode(op);
 471                         op = get();
 472                         if (op >= 0)
 473                                 if (wasJump)
 474                                                 prl("SKIP END");
 475                                 else
 476                                                 prl("CALL a" + counter + " END");
 477                 }
 478                 prl("CALL Z;\nSKIP END\nENDACTIONS;\n");
 479                 prl(getStandardEnd());
 480
 481         }
 482
 483         public void convertFile(File f) {
 484                 try {
 485                         convertStream(new FileInputStream(f));
 486                 } catch (Exception ex) {
 487                         ex.printStackTrace();
 488                 }
 489         }
 490
 491         public void printHelp() {
 492                 System.out.println("MicroJava bytecode to WSL converter. v " + versionN
 493                                 + ", by Doni Pracner");
 494                 System.out.println("usage:\n\t mjc2wsl {options} filename [outfile]");
 495                 System.out.println("options:\n\t--screen print output to screen");
 496                 System.out.println("\t-o --oc[+-] include original code in comments");
 497                 System.out.println("\t-v verbose, print warning messages");
 498                 System.out.println("\t-q don't print even the error messages");
 499                 System.out.println("\t-d print detailed debug messages");
 500         }
 501
 502         public String makeDefaultOutName(String inname){
 503                 String rez = inname;
 504                 if (inname.endsWith(".obj"))
 505                         rez = rez.substring(0, rez.length() - 4);
 506                 return rez + ".wsl";
 507         }
 508
 509         public void run(String[] args) {
 510                 if (args.length == 0) {
 511                         printHelp();
 512                 } else {
 513                         int i = 0;
 514                         while (i < args.length && args[i].charAt(0) == '-') {
 515                                 if (args[i].compareTo("-h") == 0) {
 516                                         printHelp();
 517                                         return;
 518                                 } else if (args[i].compareTo("-o") == 0
 519                                                 || args[i].startsWith("--oc")) {
 520                                         if (args[i].length() == 2)
 521                                                 originalInComments = true;
 522                                         else if (args[i].length() == 5)
 523                                                 originalInComments = args[i].charAt(4) == '+';
 524                                         else
 525                                                 originalInComments = true;
 526                                 } else if (args[i].compareTo("--screen") == 0) {
 527                                         out = new PrintWriter(System.out);
 528                                 } else if (args[i].compareTo("-d") == 0) {
 529                                         printLevel = M_DEB;//print debug info
 530                                 } else if (args[i].compareTo("-v") == 0) {
 531                                         printLevel = M_WAR;//print warnings
 532                                 } else if (args[i].compareTo("-q") == 0) {
 533                                         printLevel = M_ERR+1;//no printing
 534                                 } else if (args[i].compareToIgnoreCase("--genEStackPrint") == 0) {
 535                                         genPrintEStackOnChange = true;
 536                                 } else if (args[i].compareToIgnoreCase("--genAddrPause") == 0) {
 537                                         genPauseAfterEachAddress = true;
 538                                 } else if (args[i].compareToIgnoreCase("--genAddrPrint") == 0) {
 539                                         genPrintForEachAddress = true;
 540                                 } else if (args[i].compareToIgnoreCase("--genAddr") == 0) {
 541                                         genPrintForEachAddress = true;
 542                                         genPauseAfterEachAddress = true;
 543                                 } else if (args[i].compareToIgnoreCase("--genAll") == 0) {
 544                                         genPrintEStackOnChange = true;
 545                                         genPrintForEachAddress = true;
 546                                         genPauseAfterEachAddress = true;
 547                                 }i++;
 548                         }
 549
 550                         if (i >= args.length) {
 551                                 System.out.println("no filename supplied");
 552                                 System.exit(2);
 553                         }
 554                         File f = new File(args[i]);
 555
 556                         if (i + 1 < args.length) {
 557                                 try {
 558                                         out = new PrintWriter(args[i + 1]);
 559                                 } catch (Exception e) {
 560                                         System.err.println("error in opening out file:");
 561                                         e.printStackTrace();
 562                                 }
 563                         }
 564                         if (out == null) {
 565                                 // if not set to screen, or a file, make a default filename
 566                                 try {
 567                                         out = new PrintWriter(makeDefaultOutName(args[i]));
 568                                 } catch (Exception e) {
 569                                         System.err.println("error in opening out file:");
 570                                         e.printStackTrace();
 571                                 }
 572                         }
 573                         if (f.exists()) {
 574                                 Calendar now = Calendar.getInstance();
 575                                 convertFile(f);
 576                                 long mili = Calendar.getInstance().getTimeInMillis()
 577                                                 - now.getTimeInMillis();
 578                                 System.out.println("conversion time:" + mili + " ms");
 579                                 printMessageCounters();
 580                                 out.close();
 581                         } else
 582                                 System.out.println("file does not exist");
 583                 }
 584         }
 585
 586         public static void main(String[] args) {
 587                 new mjc2wsl().run(args);
 588         }
 589 }