src/mjc2wsl.java

   1 /*
   2    Copyright (C) 2014  Doni Pracner
   3
   4     This file is part of mjc2wsl.
   5
   6     mjc2wsl is free software: you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation, either version 3 of the License, or
   9     (at your option) any later version.
  10
  11     mjc2wsl is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with mjc2wsl.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19 import java.io.*;
  20 import java.util.*;
  21
  22 /**
  23  * This program converts file from compiled MicroJava bytecode to WSL language
  24  * which is a part of the FermaT Transformation system. MicroJava is a subset
  25  * used in Compiler Construction courses by Hanspeter Moessenboeck, not
  26  * "Java ME".
  27  *
  28  * @author Doni Pracner, http://perun.dmi.rs/pracner http://quemaster.com
  29  */
  30 public class mjc2wsl{
  31         public static String versionN = "0.1.6";
  32
  33         private TransMessages messages = new TransMessages();
  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         private boolean originalInComments = false;
 112
 113         private HashMap<Integer,String> opMap = null;
 114
 115         private String opCodeFile = "mj-bytecodes.properties";
 116
 117         private HashMap<Integer, String> getOpMap() {
 118                 if (opMap == null) {
 119                         opMap = new HashMap<Integer, String>(60, 0.98f);
 120                         try {
 121                                 BufferedReader in = new BufferedReader(new InputStreamReader(
 122                                                 getClass().getResourceAsStream(opCodeFile)));
 123                                 String str = in.readLine();
 124                                 while (str != null) {
 125                                         String[] ss = str.split("=");
 126                                         opMap.put(Integer.parseInt(ss[0]), ss[1]);
 127                                         str = in.readLine();
 128                                 }
 129                                 in.close();
 130                         } catch (Exception ex) {
 131                                 ex.printStackTrace();
 132                         }
 133                 }
 134                 return opMap;
 135         }
 136
 137         public String getOpString(int op) {
 138                 return getOpMap().get(op);
 139         }
 140
 141         public String describeOpCode(int op) {
 142                 return op + " (" + getOpString(op) + ")";
 143         }
 144
 145         private InputStream mainIn;
 146         private PrintWriter out = null;
 147         private int counter = -1;
 148
 149         private void pr(int i){
 150                         out.print(i);
 151         }
 152
 153         private void pr(char i){
 154                         out.print(i);
 155         }
 156
 157         private void pr(String i){
 158                         out.print(i);
 159         }
 160
 161         private void prl(String i){
 162                         out.println(i);
 163         }
 164
 165         private int get() {
 166                 int res = -1;
 167                 try {
 168                         res = mainIn.read();
 169                         if (res >= 0)
 170                                 res = res << 24 >>> 24;
 171                 } catch (IOException ex) {
 172                         ex.printStackTrace();
 173                 }
 174                 counter++;
 175                 return res;
 176         }
 177
 178         private int get2() {
 179                 return (get() * 256 + get()) << 16 >> 16;
 180         }
 181
 182         private int get4() {
 183                 return (get2() << 16) + (get2() << 16 >>> 16);
 184         }
 185
 186         public String createStandardStart(){
 187                         return createStandardStart(10);
 188         }
 189
 190         public String createStandardStart(int numWords){
 191                 StringBuilder ret = new StringBuilder(
 192                         "C:\" This file automatically converted from microjava bytecode\";\n"
 193                         +"C:\" with mjc2wsl v "+versionN+"\";\n");
 194
 195                 ret.append("BEGIN ");
 196                 ret.append("VAR < \n\t");
 197                 ret.append("mjvm_locals := ARRAY(1,0), ");
 198                 ret.append("\n\tmjvm_statics := ARRAY("+numWords+",0), ");
 199                 ret.append("\n\tmjvm_arrays := < >, ");
 200                 ret.append("\n\tmjvm_objects := < >, ");
 201                 ret.append("\n  mjvm_estack := < >, mjvm_mstack := < > > : ");
 202
 203                 return ret.toString();
 204         }
 205
 206         public String createStandardEnd(){
 207                 StringBuilder ret = new StringBuilder("SKIP\nENDVAR");
 208                 ret.append("\nWHERE\n");
 209
 210                 ret.append("\nPROC Print_MJ(val, format VAR)==\n");
 211                 ret.append(createComment("print spacing", C_SPEC));
 212
 213                 ret.append("\n\tIF format>1 THEN\n\t\tFOR i:=2 TO ");
 214                 ret.append("format STEP 1 DO PRINFLUSH(\" \") OD\n");
 215                 ret.append("\tFI;\n\tPRINFLUSH(val)\nEND\n");
 216
 217                 ret.append("\nEND\n");
 218
 219                 return ret.toString();
 220         }
 221
 222         private String createStartVar(String... vars){
 223                 StringBuilder ret = new StringBuilder("VAR < ");
 224                 ret.append(vars[0] + " := 0");
 225                 for (int i=1; i<vars.length; i++)
 226                                 ret.append(", "+ vars[i] +" := 0");
 227                 ret.append(" > : ");
 228
 229                 return ret.toString();
 230         }
 231
 232         private String createEndVar(){
 233                 return "ENDVAR;";
 234         }
 235
 236         private String createLocal(int i) {
 237                 // arrays start at 1 in WSL, so we need an offset
 238                 return "mjvm_locals[" + (i + 1) + "]";
 239         }
 240
 241         private String createStatic(int i) {
 242                 return "mjvm_statics[" + (i + 1) + "]";
 243         }
 244
 245         private String createArray(int i) {
 246                 return "mjvm_arrays[" + i + "]";
 247         }
 248
 249         private String createArray(String i) {
 250                 return "mjvm_arrays[" + i + "]";
 251         }
 252
 253         private String createObject(String i) {
 254                 return "mjvm_objects[" + i + "]";
 255         }
 256
 257         /**
 258          * Creates a WSL comment with care to quote chars.
 259          */
 260         public static String createComment(String str){
 261                 return createComment(str, C_REG);
 262         }
 263
 264         /**
 265          * Creates a WSL comment with care to quote chars, of the
 266          * given type.  Types are given as char constants. They can be
 267          * default comments, comments that contain the original code
 268          * in them, or additional comments regarding the translation
 269          * process.
 270          */
 271         public static String createComment(String str, char type) {
 272                 return "C:\"" + type + str.replace("\"", "''") + "\";";
 273         }
 274
 275         // generalised stack operations
 276
 277         private String createToStack(String stack, String var){
 278                         return stack + " := <" + var + " > ++ " + stack +";";
 279         }
 280
 281         private String createFromStack(String stack, String var){
 282                         return var + ":= HEAD("+stack+"); "+stack+" := TAIL("+stack+");";
 283         }
 284 //Expression stack
 285
 286         private String createToEStack(int i) {
 287                 return createToEStack(i+"");
 288         }
 289
 290         private String createToEStack(String i) {
 291                 String res = createToStack("mjvm_estack", i);
 292                 if (genPrintEStackOnChange)
 293                         res += "PRINT(\"eStack\",mjvm_estack);";
 294                 return res;
 295         }
 296
 297         private String createFromEStack(String st) {
 298                 String res = createFromStack("mjvm_estack",st);
 299                 if (genPrintEStackOnChange)
 300                         res += "PRINT(\"eStack\",mjvm_estack);";
 301                 return res;
 302         }
 303
 304         private String createPopEStack() {
 305                 String res = "mjvm_estack := TAIL(mjvm_estack);";
 306                 if (genPrintEStackOnChange)
 307                         res += "PRINT(\"eStack\",mjvm_estack);";
 308                 return res;
 309         }
 310
 311         private String createTopTwoEStack() {
 312                 return createFromEStack("tempa") + "\n" + createFromEStack("tempb");
 313         }
 314
 315         private String createTopEStack() {
 316                 return createFromEStack("tempa");
 317         }
 318
 319         //Method stack
 320
 321         private String createToMStack(int i) {
 322                 return createToMStack(i+"");
 323         }
 324
 325         private String createToMStack(String i) {
 326                 return createToStack("mjvm_mstack", i);
 327         }
 328
 329         private String createFromMStack(String st) {
 330                 return createFromStack("mjvm_mstack", st);
 331         }
 332
 333         private String getRelationFor(int opcode) throws Exception {
 334                 switch (opcode) {
 335                                 case jeq: return "=";
 336                                 case jne: return "<>";
 337                                 case jlt: return "<";
 338                                 case jle: return "<=";
 339                                 case jgt: return ">";
 340                                 case jge: return ">=";
 341                 }
 342                 throw new Exception("Wrong opcode for a relation");
 343         }
 344
 345         private boolean isJumpCode(int opcode) {
 346                 return (opcode >= jmp) && (opcode <= jge);
 347         }
 348
 349         public void convertStream(InputStream ins) throws Exception{
 350                 mainIn = ins;
 351                 //process start
 352                 byte m = (byte) get();
 353                 byte j = (byte) get();
 354                 if (m!='M' || j !='J')
 355                                 throw new Exception("Wrong start of bytecode file");
 356                 int codesize = get4();
 357                 int numberOfWords = get4();
 358                 int mainAdr = get4();
 359
 360                 prl(createStandardStart(numberOfWords));
 361                 prl("SKIP;\n ACTIONS a" + (14 + mainAdr) + " :");
 362                 int op = get();
 363                 while (op >= 0) {
 364                         if (originalInComments)
 365                                 prl(createComment(describeOpCode(op), C_OC));
 366                         prl(" a" + counter + " == ");
 367                         if (genPrintForEachAddress) {
 368                                 prl("PRINT(\"a" + counter + "\");");
 369                                 if (genPauseAfterEachAddress)
 370                                         prl("debug_disposable_string := @Read_Line(Standard_Input_Port);");
 371                         }
 372                         switch (op) {
 373                         case load: {
 374                                 prl(createToEStack(createLocal(get())));
 375                                 break;
 376                         }
 377                         case load_0:
 378                         case load_1:
 379                         case load_2:
 380                         case load_3: {
 381                                 prl(createToEStack(createLocal(op - load_0)));
 382                                 break;
 383                         }
 384                         case store: {
 385                                 prl(createFromEStack(createLocal(get())));
 386                                 break;
 387                         }
 388                         case store_0:
 389                         case store_1:
 390                         case store_2:
 391                         case store_3: {
 392                                 prl(createFromEStack(createLocal(op - store_0)));
 393                                 break;
 394                         }
 395
 396                         case getstatic: {
 397                                 prl(createToEStack(createStatic(get2())));
 398                                 break;
 399                         }
 400                         case putstatic: {
 401                                 prl(createFromEStack(createStatic(get2())));
 402                                 break;
 403                         }
 404
 405                         case getfield: {
 406                                 int f = get2();
 407                                 prl(createTopEStack());
 408                                 prl(createToEStack(createObject("tempa") + "[" + (f + 1) + "]"));
 409                                 break;
 410                         }
 411                         case putfield: {
 412                                 int f = get2();
 413                                 // we need to use a temparray as a pointer, WSL
 414                                 // otherwise tries to access it as a list of lists and fails
 415                                 prl(createTopTwoEStack());
 416                                 prl("VAR < tempArray := " + createObject("tempb") + " > :");
 417                                 prl("tempArray[" + (f + 1) + "]:=tempa ENDVAR;");
 418                                 break;
 419                         }
 420
 421                         case const_: {
 422                                 prl(createToEStack(get4()));
 423                                 break;
 424                         }
 425
 426                         case const_0:
 427                         case const_1:
 428                         case const_2:
 429                         case const_3:
 430                         case const_4:
 431                         case const_5: {
 432                                 prl(createToEStack(op - const_0));
 433                                 break;
 434                         }
 435
 436                         case add: {
 437                                 prl(createStartVar("tempa", "tempb", "tempres"));
 438                                 prl(createTopTwoEStack());
 439                                 prl("tempres := tempb + tempa;");
 440                                 prl(createToEStack("tempres"));
 441                                 prl(createEndVar());
 442                                 break;
 443                         }
 444                         case sub: {
 445                                 prl(createStartVar("tempa", "tempb", "tempres"));
 446                                 prl(createTopTwoEStack());
 447                                 prl("tempres := tempb - tempa;");
 448                                 prl(createToEStack("tempres"));
 449                                 prl(createEndVar());
 450                                 break;
 451                         }
 452                         case mul: {
 453                                 prl(createStartVar("tempa", "tempb", "tempres"));
 454                                 prl(createTopTwoEStack());
 455                                 prl("tempres := tempb * tempa;");
 456                                 prl(createToEStack("tempres"));
 457                                 prl(createEndVar());
 458                                 break;
 459                         }
 460                         case div: {
 461                                 prl(createStartVar("tempa", "tempb", "tempres"));
 462                                 prl(createTopTwoEStack());
 463                                 prl("IF tempa = 0 THEN ERROR(\"division by zero\") FI;");
 464                                 prl("tempres := tempb DIV tempa;");
 465                                 prl(createToEStack("tempres"));
 466                                 prl(createEndVar());
 467                                 break;
 468                         }
 469                         case rem: {
 470                                 prl(createStartVar("tempa", "tempb", "tempres"));
 471                                 prl(createTopTwoEStack());
 472                                 prl("IF tempa = 0 THEN ERROR(\"division by zero\") FI;");
 473                                 prl("tempres := tempb MOD tempa;");
 474                                 prl(createToEStack("tempres"));
 475                                 prl(createEndVar());
 476                                 break;
 477                         }
 478
 479                         case neg: {
 480                                 prl(createStartVar("tempa"));
 481                                 prl(createTopEStack());
 482                                 prl(createToEStack("-tempa"));
 483                                 prl(createEndVar());
 484                                 break;
 485                         }
 486
 487                         case shl: {
 488                                 prl(createTopTwoEStack());
 489                                 prl("VAR <tempres :=tempb, i:=1 >:");
 490                                 prl("\tFOR i:=1 TO tempa STEP 1 DO tempres := tempres * 2 OD;");
 491                                 prl(createToEStack("tempres"));
 492                                 prl("ENDVAR;");
 493                                 break;
 494                         }
 495                         case shr: {
 496                                 prl(createTopTwoEStack());
 497                                 prl("VAR <tempres :=tempb, i:=1 >:");
 498                                 prl("\tFOR i:=1 TO tempa STEP 1 DO tempres := tempres DIV 2 OD;");
 499                                 prl(createToEStack("tempres"));
 500                                 prl("ENDVAR;");
 501                                 break;
 502                         }
 503
 504                         case inc: {
 505                                 int b1 = get(), b2 = get();
 506                                 prl(createLocal(b1) + " := " + createLocal(b1) + " + " + b2 + ";");
 507                                 break;
 508                         }
 509
 510                         case new_: {
 511                                 int size = get2();
 512                                 // TODO maybe objects and arrays should be in the same list?
 513                                 prl("mjvm_objects := mjvm_objects ++ < ARRAY(" + size
 514                                                 + ",0) >;");
 515                                 prl(createToEStack("LENGTH(mjvm_objects)"));
 516                                 break;
 517                         }
 518                         case newarray: {
 519                                 get();// 0 - bytes, 1 - words; ignore for now
 520                                 // TODO take into consideration 0/1
 521                                 prl(createTopEStack());
 522                                 prl("mjvm_arrays := mjvm_arrays ++ < ARRAY(tempa,0) >;");
 523                                 prl(createToEStack("LENGTH(mjvm_arrays)"));
 524                                 break;
 525                         }
 526
 527                         case aload:
 528                         case baload: {
 529                                 prl(createTopTwoEStack());
 530                                 prl(createToEStack(createArray("tempb") + "[tempa+1]"));
 531                                 break;
 532                         }
 533                         case astore:
 534                         case bastore: {
 535                                 prl(createFromEStack("tempres"));
 536                                 prl(createTopTwoEStack());
 537                                 // we need to use a temparray as a pointer, WSL
 538                                 // otherwise tries to access it as a list of lists and fails
 539                                 prl("VAR < tempArray := " + createArray("tempb") + " > :");
 540                                 prl("tempArray[tempa+1]:=tempres ENDVAR;");
 541                                 break;
 542                         }
 543                         case arraylength: {
 544                                 prl(createTopEStack());
 545                                 prl("tempb := LENGTH("+ createArray("tempa") + ");");
 546                                 prl(createToEStack("tempb"));
 547                                 break;
 548                         }
 549
 550                         case dup: {
 551                                 prl(createTopEStack());
 552                                 prl(createToEStack("tempa"));
 553                                 prl(createToEStack("tempa"));
 554                                 break;
 555                         }
 556                         case dup2: {
 557                                 prl(createTopTwoEStack());
 558                                 prl(createToEStack("tempb"));
 559                                 prl(createToEStack("tempa"));
 560                                 prl(createToEStack("tempb"));
 561                                 prl(createToEStack("tempa"));
 562                                 break;
 563                         }
 564
 565                         case pop: {
 566                                 prl(createPopEStack());
 567                                 break;
 568                         }
 569
 570                         case jmp: {
 571                                 prl("CALL a" + (counter + get2()) + ";");
 572                                 break;
 573                         }
 574
 575                         case jeq:
 576                         case jne:
 577                         case jlt:
 578                         case jle:
 579                         case jgt:
 580                         case jge: {
 581                                 prl(createStartVar("tempa", "tempb"));
 582                                 prl(createTopTwoEStack());
 583                                 prl("IF tempb " + getRelationFor(op) + " tempa THEN CALL a"
 584                                                 + (counter + get2()) + " ELSE CALL a" + (counter + 1)
 585                                                 + " FI;");
 586                                 prl(createEndVar());
 587
 588                                 break;
 589                         }
 590
 591                         case call: {
 592                                 prl("CALL a" + (counter + get2()) + ";");
 593                                 break;
 594                         }
 595
 596                         case return_: {
 597                                 // we let the actions return
 598                                 // there is nothing to clean up
 599                                 prl("SKIP\n END\n b" + counter + " ==");
 600                                 break;
 601                         }
 602                         case enter: {
 603                                 int parameters = get();
 604
 605                                 int locals = get();
 606                                 prl(createToMStack("mjvm_locals"));
 607                                 prl("mjvm_locals := ARRAY(" + locals + ",0);");
 608                                 for (int i = parameters - 1; i >= 0; i--)
 609                                         prl(createFromEStack(createLocal(i)));
 610                                 break;
 611                         }
 612                         case exit: {
 613                                 prl(createFromMStack("mjvm_locals"));
 614                                 break;
 615                         }
 616
 617                         // read, print
 618                         case bread: {
 619                                 // TODO make it a char for read
 620                                 messages.message("char is read like a number", TransMessages.M_WAR);
 621                                 prl(createComment("char is read like a number", C_SPEC));
 622                         }
 623                         case read: {
 624                                 prl(createStartVar("tempa"));
 625                                 prl("tempa := @String_To_Num(@Read_Line(Standard_Input_Port));");
 626                                 prl(createToEStack("tempa"));
 627                                 prl(createEndVar());
 628                                 break;
 629                         }
 630
 631                         // the prints
 632                         case bprint: {
 633                                 // TODO need to make it a char on print
 634                                 messages.message("chars will be printed as number codes", TransMessages.M_WAR);
 635                                 prl(createComment("char will be printed as a number code",
 636                                                 C_SPEC));
 637                         }
 638                         case print: {
 639                                 // TODO printing numbers needs different lengths of spacing
 640                                 prl(createStartVar("tempa", "tempb"));
 641
 642                                 prl(createTopTwoEStack());
 643                                 prl("Print_MJ(tempb,tempa);");
 644                                 prl(createEndVar());
 645                                 break;
 646                         }
 647
 648                         case trap: {
 649                                 prl("ERROR(\"Runtime error: trap(" + get() + ")\");");
 650                                 break;
 651                         }
 652
 653                         default:
 654                                 prl(createComment("unknown op error: " + op, C_ERR));
 655                                 messages.message("unknown op error: " + op, TransMessages.M_ERR);
 656                                 break;
 657                         }
 658
 659                         boolean wasJump = isJumpCode(op);
 660                         op = get();
 661                         if (op >= 0)
 662                                 if (wasJump)
 663                                         prl("SKIP\n END");
 664                                 else
 665                                         prl("CALL a" + counter + "\n END");
 666                 }
 667                 prl("SKIP\n END\nENDACTIONS;\n");
 668                 prl(createStandardEnd());
 669         }
 670
 671         public void convertFile(File f) {
 672                 try {
 673                         convertStream(new FileInputStream(f));
 674                 } catch (Exception ex) {
 675                         ex.printStackTrace();
 676                 }
 677         }
 678
 679         public void printHelp() {
 680                 printVersion();
 681                 printUsage();
 682                 printHelpOutput();
 683                 printHelpHelp();
 684         }
 685
 686         public void printLongHelp() {
 687                 printVersion();
 688                 printUsage();
 689                 System.out.println();
 690                 printHelpOutput();
 691                 System.out.println();
 692                 printHelpGenerating();
 693                 System.out.println();
 694                 printHelpHelp();
 695         }
 696
 697         public void printHelpOutput() {
 698                 System.out.println("Output options:");
 699                 System.out.println("  --screen print output to screen");
 700                 System.out.println("  -o --oc[+-] include original code in comments");
 701                 System.out.println("  -v verbose, print warning messages");
 702                 System.out.println("  -q quiet; don't print even the error messages");
 703                 System.out.println("  -d print detailed debug messages");
 704         }
 705
 706         public void printHelpGenerating() {
 707                 System.out.println("Options for generating extra code for tracking code execution");
 708                 System.out.println("  --genEStackPrint generate print for all EStack changes");
 709                 System.out.println("  --genAddrPrint  generate prints after every address of the original code ");
 710                 System.out.println("  --genAddrPause  generate a pause after every address of the original code ");
 711                 System.out.println("  --genAddr  short for --genAddrPrint and --genAddrPause");
 712                 System.out.println("  --genAll   short for applying all code generation");
 713         }
 714
 715         public void printHelpHelp() {
 716                 System.out.println("Help and info options");
 717                 System.out.println("  -h basic help");
 718                 System.out.println("  --help print more detailed help");
 719                 System.out.println("  --version or -version print version and exit");
 720         }
 721
 722         public void printUsage(){
 723                 System.out.println("usage:\n\t mjc2wsl {options} filename [outfile]");
 724         }
 725
 726         public void printVersion() {
 727                 System.out.println("MicroJava bytecode to WSL converter. v " + versionN
 728                                 + ", by Doni Pracner");
 729         }
 730
 731         public String makeDefaultOutName(String inname){
 732                 String rez = inname;
 733                 if (inname.endsWith(".obj"))
 734                         rez = rez.substring(0, rez.length() - 4);
 735                 return rez + ".wsl";
 736         }
 737
 738         public void run(String[] args) {
 739                 if (args.length == 0) {
 740                         printHelp();
 741                 } else {
 742                         int i = 0;
 743                         while (i < args.length && args[i].charAt(0) == '-') {
 744                                 if (args[i].compareTo("-h") == 0) {
 745                                         printHelp();
 746                                         return;
 747                                 } else if (args[i].compareTo("--help") == 0) {
 748                                         printLongHelp();
 749                                         return;
 750                                 } else if (args[i].compareTo("--version") == 0
 751                                                 || args[i].compareTo("-version") == 0) {
 752                                         printVersion();
 753                                         return;
 754                                 } else if (args[i].compareTo("-o") == 0
 755                                                 || args[i].startsWith("--oc")) {
 756                                         if (args[i].length() == 2)
 757                                                 originalInComments = true;
 758                                         else if (args[i].length() == 5)
 759                                                 originalInComments = args[i].charAt(4) == '+';
 760                                         else
 761                                                 originalInComments = true;
 762                                 } else if (args[i].compareTo("--screen") == 0) {
 763                                         out = new PrintWriter(System.out);
 764                                 } else if (args[i].compareTo("-d") == 0) {
 765                                         messages.setPrintLevel(TransMessages.M_DEB);// print debug info
 766                                 } else if (args[i].compareTo("-v") == 0) {
 767                                         messages.setPrintLevel(TransMessages.M_WAR);// print warnings
 768                                 } else if (args[i].compareTo("-q") == 0) {
 769                                         messages.setPrintLevel(TransMessages.M_QUIET);// no printing
 770                                 } else if (args[i].compareToIgnoreCase("--genEStackPrint") == 0) {
 771                                         genPrintEStackOnChange = true;
 772                                 } else if (args[i].compareToIgnoreCase("--genAddrPause") == 0) {
 773                                         genPauseAfterEachAddress = true;
 774                                 } else if (args[i].compareToIgnoreCase("--genAddrPrint") == 0) {
 775                                         genPrintForEachAddress = true;
 776                                 } else if (args[i].compareToIgnoreCase("--genAddr") == 0) {
 777                                         genPrintForEachAddress = true;
 778                                         genPauseAfterEachAddress = true;
 779                                 } else if (args[i].compareToIgnoreCase("--genAll") == 0) {
 780                                         genPrintEStackOnChange = true;
 781                                         genPrintForEachAddress = true;
 782                                         genPauseAfterEachAddress = true;
 783                                 }
 784                                 i++;
 785                         }
 786
 787                         if (i >= args.length) {
 788                                 System.out.println("no filename supplied");
 789                                 System.exit(2);
 790                         }
 791                         File f = new File(args[i]);
 792
 793                         if (i + 1 < args.length) {
 794                                 try {
 795                                         out = new PrintWriter(args[i + 1]);
 796                                 } catch (Exception e) {
 797                                         System.err.println("error in opening out file:");
 798                                         e.printStackTrace();
 799                                 }
 800                         }
 801                         if (out == null) {
 802                                 // if not set to screen, or a file, make a default filename
 803                                 try {
 804                                         out = new PrintWriter(makeDefaultOutName(args[i]));
 805                                 } catch (Exception e) {
 806                                         System.err.println("error in opening out file:");
 807                                         e.printStackTrace();
 808                                 }
 809                         }
 810                         if (f.exists()) {
 811                                 Calendar now = Calendar.getInstance();
 812                                 convertFile(f);
 813                                 long mili = Calendar.getInstance().getTimeInMillis()
 814                                                 - now.getTimeInMillis();
 815                                 System.out.println("conversion time:" + mili + " ms");
 816                                 messages.printMessageCounters();
 817                                 out.close();
 818                         } else
 819                                 System.out.println("file does not exist");
 820                 }
 821         }
 822
 823         public static void main(String[] args) {
 824                 new mjc2wsl().run(args);
 825         }
 826 }