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                         return getStandardStart(10);
 113         }
 114
 115         public String getStandardStart(int numWords){
 116                 StringBuilder ret = new StringBuilder(
 117                         "C:\" This file automatically converted from microjava bytecode\";\n"
 118                         +"C:\" with mjc2wsl v "+versionN+"\";\n");
 119
 120                 ret.append("VAR < tempa := 0, tempb := 0, tempres :=0,\n\t");
 121                 ret.append("mjvm_locals := ARRAY(1,0), ");
 122                 ret.append("\n\tmjvm_statics := ARRAY("+numWords+",0), ");
 123                 ret.append("\n  mjvm_estack := < >, mjvm_mstack := < >, ");
 124                 ret.append("\n  mjvm_fp := 0, mjvm_sp := 0,");
 125                 ret.append("\n  t_e_m_p := 0 > :");
 126
 127                 return ret.toString();
 128         }
 129
 130         public String getStandardEnd(){
 131                 return "SKIP\nENDVAR";
 132         }
 133
 134         private boolean originalInComments = false;
 135
 136         private HashMap<Integer,String> opMap = null;
 137
 138         private String opCodeFile = "mj-bytecodes.properties";
 139
 140         private HashMap<Integer,String> getOpMap() {
 141                         if (opMap==null) {
 142                                         opMap = new HashMap<Integer, String> (60, 0.98f);
 143                                         try{
 144                                         BufferedReader in = new BufferedReader(
 145                                                         new InputStreamReader(getClass().getResourceAsStream(opCodeFile)));
 146                                         String str = in.readLine();
 147                                         while (str != null) {
 148                                                         String[] ss = str.split("=");
 149                                                         opMap.put(Integer.parseInt(ss[0]),ss[1]);
 150                                                         str = in.readLine();
 151                                         }
 152                                         in.close();
 153                                         }catch (Exception ex) {
 154                                                 ex.printStackTrace();
 155                                         }
 156                         }
 157                         return opMap;
 158         }
 159
 160         public String getOpString(int op) {
 161                         return getOpMap().get(op);
 162         }
 163
 164         public String describeOpCode(int op) {
 165                         return op + " (" + getOpString(op) + ")";
 166         }
 167
 168         private InputStream mainIn;
 169         private PrintWriter out = null;
 170         private int counter = -1;
 171
 172         private void pr(int i){
 173                         out.print(i);
 174         }
 175
 176         private void pr(char i){
 177                         out.print(i);
 178         }
 179
 180         private void pr(String i){
 181                         out.print(i);
 182         }
 183
 184         private void prl(String i){
 185                         out.println(i);
 186         }
 187
 188         private int get() {
 189                 int res = -1;
 190                 try {
 191                         res = mainIn.read();
 192                         if (res >= 0)
 193                                 res = res << 24 >>> 24;
 194                 } catch (IOException ex) {
 195                         ex.printStackTrace();
 196                 }
 197                 counter++;
 198                 return res;
 199         }
 200
 201         private int get2() {
 202                 return (get() * 256 + get()) << 16 >> 16;
 203         }
 204
 205         private int get4() {
 206                 return (get2() << 16) + (get2() << 16 >>> 16);
 207         }
 208
 209         private String loc(int i){
 210                 //arrays start at 1 in WSL, so we need an offset
 211                 return "mjvm_locals[" + (i+1)+"]";
 212         }
 213
 214         private String genStatic(int i){
 215                         return "mjvm_statics[" + (i+1)+"]";
 216         }
 217
 218         /**
 219          * Creates a WSL comment with care to quote chars.
 220          */
 221         public static String createComment(String str){
 222                 return createComment(str, C_REG);
 223         }
 224
 225         /**
 226          * Creates a WSL comment with care to quote chars, of the
 227          * given type.  Types are given as char constants. They can be
 228          * default comments, comments that contain the original code
 229          * in them, or additional comments regarding the translation
 230          * process.
 231          */
 232         public static String createComment(String str, char type) {
 233                 return "C:\"" + type + str.replace("\"", "''") + "\";";
 234         }
 235
 236         //Expression stack
 237
 238         private String cmdToEStack(int i) {
 239                 String res = "mjvm_estack := <" + i + " > ++ mjvm_estack;";
 240                 if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
 241                 return res;
 242         }
 243
 244         private String cmdToEStack(String i) {
 245                 String res = "mjvm_estack := <" + i + " > ++ mjvm_estack;";
 246                 if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
 247                 return res;
 248         }
 249
 250         private String cmdFromEStack(String st) {
 251                 String res = st + " := HEAD(mjvm_estack); mjvm_estack := TAIL(mjvm_estack);";
 252                 if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
 253                 return res;
 254         }
 255
 256         private String getTopTwo(){
 257                 return cmdFromEStack("tempa") + "\n" + cmdFromEStack("tempb");
 258         }
 259
 260         private String getTop() {
 261                 return cmdFromEStack("tempa");
 262         }
 263
 264         //Method stack
 265
 266         private String cmdToMStack(int i) {
 267                 return "mjvm_mstack := <" + i + " > ++ mjvm_mstack;";
 268         }
 269
 270         private String cmdToMStack(String i) {
 271                 return "mjvm_mstack := <" + i + " > ++ mjvm_mstack;";
 272         }
 273
 274         private String cmdFromMStack(String st) {
 275                 return st + " := HEAD(mjvm_mstack); mjvm_mstack := TAIL(mjvm_mstack);";
 276         }
 277
 278         private String getRelationFor(int opcode) throws Exception {
 279                         switch (opcode) {
 280                                         case jeq: return "=";
 281                                         case jne: return "<>";
 282                                         case jlt: return "<";
 283                                         case jle: return "<=";
 284                                         case jgt: return ">";
 285                                         case jge: return ">=";
 286                         }
 287                         throw new Exception("Wrong opcode for a relation");
 288         }
 289
 290         private boolean isJumpCode(int opcode) {
 291                         return (opcode>=jmp) && (opcode<=jge);
 292         }
 293
 294         public void convertStream(InputStream ins) throws Exception{
 295                 mainIn = ins;
 296                 //process start
 297                 byte m = (byte) get();
 298                 byte j = (byte) get();
 299                 if (m!='M' || j !='J')
 300                                 throw new Exception("Wrong start of bytecode file");
 301                 int codesize = get4();
 302                 int numberOfWords = get4();
 303                 int mainAdr = get4();
 304
 305                 prl(getStandardStart(numberOfWords));
 306                 prl("SKIP;\n ACTIONS A_S_start:\n A_S_start == CALL a"+(14+mainAdr)+" END");
 307                 int op = get();
 308                 while (op >= 0) {
 309                         if (originalInComments)
 310                                 prl(createComment(describeOpCode(op), C_OC));
 311                         prl("a" + counter + " == ");
 312                         if (genPrintForEachAddress) {
 313                                         prl("PRINT(\"a"+counter+"\");");
 314                                         if (genPauseAfterEachAddress)
 315                                                         prl("debug_disposable_string := @Read_Line(Standard_Input_Port);");
 316                         }
 317                         switch (op) {
 318                         case load: {
 319                                 prl(cmdToEStack(loc(get())));
 320                                 break;
 321                         }
 322                         case load_0:
 323                         case load_1:
 324                         case load_2:
 325                         case load_3: {
 326                                 prl(cmdToEStack(loc(op - load_0)));
 327                                 break;
 328                         }
 329                         case store: {
 330                                 prl(cmdFromEStack(loc(get())));
 331                                 break;
 332                         }
 333                         case store_0:
 334                         case store_1:
 335                         case store_2:
 336                         case store_3: {
 337                                 prl(cmdFromEStack(loc(op - store_0)));
 338                                 break;
 339                         }
 340
 341                         case getstatic:{
 342                                 prl(cmdToEStack(genStatic(get2())));
 343                                 break;
 344                         }
 345                         case putstatic: {
 346                                 prl(cmdFromEStack(genStatic(get2())));
 347                                 break;
 348                         }
 349                         //TODO getfield, putfield
 350                         case getfield:
 351                         case putfield:{
 352                                         prl(createComment("fields are not processed properly", C_ERR));
 353                                         message("fields are not processed properly", M_ERR);
 354                                         get2();
 355                                         break;
 356                         }
 357
 358                         case const_: {
 359                                 prl(cmdToEStack(get4()));
 360                                 break;
 361                         }
 362
 363                         case const_0:
 364                         case const_1:
 365                         case const_2:
 366                         case const_3:
 367                         case const_4:
 368                         case const_5: {
 369                                 prl(cmdToEStack(op - const_0));
 370                                 break;
 371                         }
 372
 373                         case add: {
 374                                 prl(getTopTwo());
 375                                 prl("tempres := tempb + tempa;");
 376                                 prl(cmdToEStack("tempres"));
 377                                 break;
 378                         }
 379                         case sub: {
 380                                 prl(getTopTwo());
 381                                 prl("tempres := tempb - tempa;");
 382                                 prl(cmdToEStack("tempres"));
 383                                 break;
 384                         }
 385                         case mul: {
 386                                 prl(getTopTwo());
 387                                 prl("tempres := tempb * tempa;");
 388                                 prl(cmdToEStack("tempres"));
 389                                 break;
 390                         }
 391                         case div: {
 392                                 prl(getTopTwo());
 393                                 prl("IF tempa = 0 THEN ERROR(\"division by zero\") FI;");
 394                                 prl("tempres := tempb DIV tempa;");
 395                                 prl(cmdToEStack("tempres"));
 396                                 break;
 397                         }
 398                         case rem: {
 399                                 prl(getTopTwo());
 400                                 prl("IF tempa = 0 THEN ERROR(\"division by zero\") FI;");
 401                                 prl("tempres := tempb MOD tempa;");
 402                                 prl(cmdToEStack("tempres"));
 403                                 break;
 404                         }
 405
 406                         //TODO neg, shl, shr, inc
 407                         //TODO new_ newarray
 408                         case new_ :
 409                                         get();//needs a short, but a byte will be taken bellow as well
 410                         case newarray :{
 411                                         prl(createComment("memory allocation not processed properly", C_ERR));
 412                                         message("memory allocation  not processed properly", M_ERR);
 413                                         get();
 414                                         break;
 415                         }
 416                         //TODO aload, asstore, baload, bastore
 417                         //TODO arraylength
 418                         //TODO pop, dup, dup2
 419
 420                         case jmp: {
 421                                 prl("CALL a" + (counter + get2()) + ";");
 422                                 break;
 423                         }
 424
 425                         case jeq:
 426                         case jne:
 427                         case jlt:
 428                         case jle:
 429                         case jgt:
 430                         case jge: {
 431                                 prl(getTopTwo());
 432                                 prl("IF tempb "+ getRelationFor(op)
 433                                                 +" tempa THEN CALL a" + (counter + get2())
 434                                                 +" ELSE CALL a" + (counter+1)
 435                                                 + " FI;");
 436                                 break;
 437                         }
 438
 439                         case call: {
 440                                 prl("CALL a" + (counter + get2()) + ";");
 441                                 break;
 442                         }
 443
 444                         case return_: {
 445                                 prl("IF EMPTY?(mjvm_mstack) THEN CALL Z FI");
 446                                 //else we let things return
 447                                 prl("END b"+counter+" ==");
 448                                 break;
 449                         }
 450                         case enter: {
 451                                 int parameters = get();
 452
 453                                 int locals = get();
 454                                 prl(cmdToMStack("mjvm_locals"));
 455                                 prl("mjvm_locals := ARRAY("+locals+",0);");
 456                                 for (int i = parameters-1; i >= 0; i--)
 457                                                 prl(cmdFromEStack(loc(i)));
 458                                 break;
 459                         }
 460                         case exit: {
 461                                 prl(cmdFromMStack("mjvm_locals"));
 462                                 break;
 463                         }
 464
 465                         // read, print
 466                         case read:{
 467                                 //TODO make it a char for read
 468                                 message("char is read like a number", M_WAR);
 469                                 prl(createComment("char is read like a number",C_SPEC));
 470                         }
 471                         case bread: {
 472                                 prl("tempa := @String_To_Num(@Read_Line(Standard_Input_Port));");
 473                                 prl(cmdToEStack("tempa"));
 474                                 break;
 475                         }
 476
 477                         // the prints
 478                         case print:{
 479                                 // TODO need to make it a char on print
 480                                 message("chars will be printed as number codes", M_WAR);
 481                                 prl(createComment("char will be printed as a number code",C_SPEC));
 482                         }
 483                         case bprint: {
 484                                 // TODO printing numbers needs different lengths of spacing
 485                                 prl(getTopTwo());
 486                                 pr(createComment("print spacing",C_SPEC));
 487                                 prl("IF tempa>1 THEN FOR i:=2 TO tempa STEP 1 DO PRINFLUSH(\" \") OD FI;");
 488                                 prl("PRINFLUSH(tempb);");
 489                                 break;
 490                         }
 491
 492                         case trap: {
 493                                 prl("ERROR(\"Runtime error: trap("+get()+")\");");
 494                                 break;
 495                         }
 496
 497
 498                         default:
 499                                 prl(createComment("unknown op error: " + op, C_ERR));
 500                                 message("unknown op error: "+ op, M_ERR);
 501                                 break;
 502                         }
 503
 504                         boolean wasJump = isJumpCode(op);
 505                         op = get();
 506                         if (op >= 0)
 507                                 if (wasJump)
 508                                                 prl("SKIP END");
 509                                 else
 510                                                 prl("CALL a" + counter + " END");
 511                 }
 512                 prl("CALL Z;\nSKIP END\nENDACTIONS;\n");
 513                 prl(getStandardEnd());
 514
 515         }
 516
 517         public void convertFile(File f) {
 518                 try {
 519                         convertStream(new FileInputStream(f));
 520                 } catch (Exception ex) {
 521                         ex.printStackTrace();
 522                 }
 523         }
 524
 525         public void printHelp() {
 526                 System.out.println("MicroJava bytecode to WSL converter. v " + versionN
 527                                 + ", by Doni Pracner");
 528                 System.out.println("usage:\n\t mjc2wsl {options} filename [outfile]");
 529                 System.out.println("options:\n\t--screen print output to screen");
 530                 System.out.println("\t-o --oc[+-] include original code in comments");
 531                 System.out.println("\t-v verbose, print warning messages");
 532                 System.out.println("\t-q don't print even the error messages");
 533                 System.out.println("\t-d print detailed debug messages");
 534         }
 535
 536         public String makeDefaultOutName(String inname){
 537                 String rez = inname;
 538                 if (inname.endsWith(".obj"))
 539                         rez = rez.substring(0, rez.length() - 4);
 540                 return rez + ".wsl";
 541         }
 542
 543         public void run(String[] args) {
 544                 if (args.length == 0) {
 545                         printHelp();
 546                 } else {
 547                         int i = 0;
 548                         while (i < args.length && args[i].charAt(0) == '-') {
 549                                 if (args[i].compareTo("-h") == 0) {
 550                                         printHelp();
 551                                         return;
 552                                 } else if (args[i].compareTo("-o") == 0
 553                                                 || args[i].startsWith("--oc")) {
 554                                         if (args[i].length() == 2)
 555                                                 originalInComments = true;
 556                                         else if (args[i].length() == 5)
 557                                                 originalInComments = args[i].charAt(4) == '+';
 558                                         else
 559                                                 originalInComments = true;
 560                                 } else if (args[i].compareTo("--screen") == 0) {
 561                                         out = new PrintWriter(System.out);
 562                                 } else if (args[i].compareTo("-d") == 0) {
 563                                         printLevel = M_DEB;//print debug info
 564                                 } else if (args[i].compareTo("-v") == 0) {
 565                                         printLevel = M_WAR;//print warnings
 566                                 } else if (args[i].compareTo("-q") == 0) {
 567                                         printLevel = M_ERR+1;//no printing
 568                                 } else if (args[i].compareToIgnoreCase("--genEStackPrint") == 0) {
 569                                         genPrintEStackOnChange = true;
 570                                 } else if (args[i].compareToIgnoreCase("--genAddrPause") == 0) {
 571                                         genPauseAfterEachAddress = true;
 572                                 } else if (args[i].compareToIgnoreCase("--genAddrPrint") == 0) {
 573                                         genPrintForEachAddress = true;
 574                                 } else if (args[i].compareToIgnoreCase("--genAddr") == 0) {
 575                                         genPrintForEachAddress = true;
 576                                         genPauseAfterEachAddress = true;
 577                                 } else if (args[i].compareToIgnoreCase("--genAll") == 0) {
 578                                         genPrintEStackOnChange = true;
 579                                         genPrintForEachAddress = true;
 580                                         genPauseAfterEachAddress = true;
 581                                 }i++;
 582                         }
 583
 584                         if (i >= args.length) {
 585                                 System.out.println("no filename supplied");
 586                                 System.exit(2);
 587                         }
 588                         File f = new File(args[i]);
 589
 590                         if (i + 1 < args.length) {
 591                                 try {
 592                                         out = new PrintWriter(args[i + 1]);
 593                                 } catch (Exception e) {
 594                                         System.err.println("error in opening out file:");
 595                                         e.printStackTrace();
 596                                 }
 597                         }
 598                         if (out == null) {
 599                                 // if not set to screen, or a file, make a default filename
 600                                 try {
 601                                         out = new PrintWriter(makeDefaultOutName(args[i]));
 602                                 } catch (Exception e) {
 603                                         System.err.println("error in opening out file:");
 604                                         e.printStackTrace();
 605                                 }
 606                         }
 607                         if (f.exists()) {
 608                                 Calendar now = Calendar.getInstance();
 609                                 convertFile(f);
 610                                 long mili = Calendar.getInstance().getTimeInMillis()
 611                                                 - now.getTimeInMillis();
 612                                 System.out.println("conversion time:" + mili + " ms");
 613                                 printMessageCounters();
 614                                 out.close();
 615                         } else
 616                                 System.out.println("file does not exist");
 617                 }
 618         }
 619
 620         public static void main(String[] args) {
 621                 new mjc2wsl().run(args);
 622         }
 623 }