native.c

   1 /* native.c - table of native functions
   2
   3    Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
   4    R. Grafl, A. Krall, C. Kruegel, C. Oates, R. Obermaisser,
   5    M. Probst, S. Ring, E. Steiner, C. Thalinger, D. Thuernbeck,
   6    P. Tomsich, J. Wenninger
   7
   8    This file is part of CACAO.
   9
  10    This program is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU General Public License as
  12    published by the Free Software Foundation; either version 2, or (at
  13    your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful, but
  16    WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  23    02111-1307, USA.
  24
  25    Contact: cacao@complang.tuwien.ac.at
  26
  27    Authors: Reinhard Grafl
  28             Roman Obermaisser
  29             Andreas Krall
  30
  31    The .hh files created with the header file generator are all
  32    included here as are the C functions implementing these methods.
  33
  34    $Id: native.c 595 2003-11-09 20:04:01Z twisti $
  35
  36 */
  37
  38
  39 #include <stdlib.h>
  40 #include <unistd.h>
  41 #include <time.h>
  42 #include <math.h>
  43 #include <string.h>
  44 #include <assert.h>
  45 #include <sys/time.h>
  46 #include <utime.h>
  47 #include <sys/utsname.h>
  48
  49 #include "global.h"
  50 #include "native.h"
  51 #include "nativetypes.hh"
  52 #include "builtin.h"
  53 #include "asmpart.h"
  54 #include "tables.h"
  55 #include "loader.h"
  56 #include "toolbox/loging.h"
  57 #include "threads/thread.h"
  58 #include "threads/threadio.h"
  59 #include "threads/locks.h"
  60
  61 /* Include files for IO functions */
  62
  63 #include <fcntl.h>
  64 #include <dirent.h>
  65 #include <sys/types.h>
  66 #ifdef _OSF_SOURCE
  67 #include <sys/mode.h>
  68 #endif
  69 #include <sys/stat.h>
  70
  71
  72 /* searchpath for classfiles */
  73 static char *classpath;
  74
  75 /* for java-string to char conversion */
  76 #define MAXSTRINGSIZE 1000
  77
  78 /******************** systemclasses required for native methods ***************/
  79
  80 static classinfo *class_java_lang_Class;
  81 static classinfo *class_java_lang_Cloneable;
  82 static classinfo *class_java_lang_CloneNotSupportedException;
  83 static classinfo *class_java_lang_System;
  84 static classinfo *class_java_lang_ClassLoader;
  85 static classinfo *class_java_lang_ClassNotFoundException;
  86 static classinfo *class_java_lang_InstantiationException;
  87 static classinfo *class_java_lang_NoSuchMethodError;
  88 static classinfo *class_java_lang_NoSuchFieldError;
  89 static classinfo *class_java_lang_ClassFormatError;
  90 static classinfo *class_java_lang_IllegalArgumentException;
  91 static classinfo *class_java_lang_ArrayIndexOutOfBoundsException;
  92 static classinfo *class_java_lang_NoSuchFieldException;
  93 static classinfo *class_java_io_SyncFailedException;
  94 static classinfo *class_java_io_IOException;
  95 static classinfo *class_java_io_FileNotFoundException;
  96 static classinfo *class_java_io_UnixFileSystem;
  97 static classinfo *class_java_security_PrivilegedActionException;
  98 static classinfo *class_java_net_UnknownHostException;
  99 static classinfo *class_java_net_SocketException;
 100 static classinfo *class_java_lang_NoSuchMethodException;
 101 static classinfo *class_java_lang_Double;
 102 static classinfo *class_java_lang_Float;
 103 static classinfo *class_java_lang_Long;
 104 static classinfo *class_java_lang_Byte;
 105 static classinfo *class_java_lang_Short;
 106 static classinfo *class_java_lang_Boolean;
 107 static classinfo *class_java_lang_Void;
 108 static classinfo *class_java_lang_Character;
 109 static classinfo *class_java_lang_Integer;
 110
 111 /* the system classloader object */
 112 struct java_lang_ClassLoader *SystemClassLoader = NULL;
 113
 114 /* for raising exceptions from native methods */
 115 java_objectheader* exceptionptr = NULL;
 116
 117 /************* use classinfo structure as java.lang.Class object **************/
 118
 119 void use_class_as_object(classinfo *c)
 120 {
 121         vftbl *vt = class_java_lang_Class->vftbl;
 122         vftbl *newtbl;
 123         if (!c->classvftbl) {
 124                 c->classvftbl = true;
 125                 copy_vftbl(&newtbl, vt);
 126                 newtbl->class = c->header.vftbl->class;
 127                 newtbl->baseval = c->header.vftbl->baseval;
 128                 newtbl->diffval = c->header.vftbl->diffval;
 129                 c->header.vftbl = newtbl;
 130         }
 131 }
 132
 133 /*********************** include Java Native Interface ************************/
 134
 135 #include "jni.c"
 136
 137 /*************************** include native methods ***************************/
 138
 139 #include "nat/Object.c"
 140 #include "nat/String.c"
 141 #include "nat/ClassLoader.c"
 142 #include "nat/Class.c"
 143 #include "nat/Compiler.c"
 144 #include "nat/Double.c"
 145 #include "nat/Float.c"
 146 #include "nat/Math.c"
 147 #include "nat/Package.c"
 148 #include "nat/Runtime.c"
 149 #include "nat/SecurityManager.c"
 150 #include "nat/System.c"
 151 #include "nat/Thread.c"
 152 #include "nat/Throwable.c"
 153 #include "nat/Finalizer.c"
 154 #include "nat/Array.c"
 155 #include "nat/Constructor.c"
 156 #include "nat/Field.c"
 157 #include "nat/Method.c"
 158 #include "nat/FileDescriptor.c"
 159 #include "nat/FileInputStream.c"
 160 #include "nat/FileOutputStream.c"
 161 #include "nat/FileSystem.c"
 162 #include "nat/ObjectInputStream.c"
 163 #include "nat/ObjectStreamClass.c"
 164 #include "nat/RandomAccessFile.c"
 165 #include "nat/ResourceBundle.c"
 166 #include "nat/JarFile.c"
 167 #include "nat/Adler32.c"
 168 #include "nat/CRC32.c"
 169 #include "nat/Deflater.c"
 170 #include "nat/Inflater.c"
 171 #include "nat/ZipEntry.c"
 172 #include "nat/ZipFile.c"
 173 #include "nat/BigInteger.c"
 174 #include "nat/InetAddress.c"
 175 #include "nat/InetAddressImpl.c"
 176 #include "nat/DatagramPacket.c"
 177 #include "nat/PlainDatagramSocketImpl.c"
 178 #include "nat/PlainSocketImpl.c"
 179 #include "nat/SocketInputStream.c"
 180 #include "nat/SocketOutputStream.c"
 181 #include "nat/AccessController.c"
 182 #include "nat/ClassLoader_NativeLibrary.c"
 183 #include "nat/UnixFileSystem.c"
 184
 185 /************************** tables for methods ********************************/
 186
 187 /* table for locating native methods */
 188 static struct nativeref {
 189         char *classname;
 190         char *methodname;
 191         char *descriptor;
 192         bool isstatic;
 193         functionptr func;
 194 } nativetable [] = {
 195
 196 #include "nativetable.hh"
 197
 198 };
 199
 200
 201 #define NATIVETABLESIZE  (sizeof(nativetable)/sizeof(struct nativeref))
 202
 203 /* table for fast string comparison */
 204 static struct nativecompref {
 205         utf *classname;
 206         utf *methodname;
 207         utf *descriptor;
 208         bool isstatic;
 209         functionptr func;
 210 } nativecomptable [NATIVETABLESIZE];
 211
 212 /* string comparsion table initialized */
 213 static bool nativecompdone = false;
 214
 215
 216 /******************************************************************************/
 217 /******************************************************************************/
 218 #include "natcalls.h"
 219
 220 /* string call comparison table initialized */
 221
 222 /******************************************************************************/
 223 /******************************************************************************/
 224
 225 /*--------------- native method calls & classes used -------------------------*/
 226
 227
 228
 229
 230 /*********************** function: native_loadclasses **************************
 231
 232         load classes required for native methods
 233
 234 *******************************************************************************/
 235
 236 void native_loadclasses()
 237 {
 238         /* class_new adds the class to the list of classes to be loaded */
 239         class_java_lang_Cloneable =
 240                 class_new(utf_new_char("java/lang/Cloneable"));
 241         class_java_lang_CloneNotSupportedException =
 242                 class_new(utf_new_char("java/lang/CloneNotSupportedException"));
 243         class_java_lang_Class =
 244                 class_new(utf_new_char("java/lang/Class"));
 245         class_java_io_IOException =
 246                 class_new(utf_new_char("java/io/IOException"));
 247         class_java_io_FileNotFoundException =
 248                 class_new(utf_new_char("java/io/FileNotFoundException"));
 249         class_java_lang_ClassNotFoundException =
 250                 class_new(utf_new_char("java/lang/ClassNotFoundException"));
 251         class_java_lang_InstantiationException =
 252                 class_new(utf_new_char("java/lang/InstantiationException"));
 253         class_java_lang_NoSuchMethodError =
 254                 class_new(utf_new_char("java/lang/NoSuchMethodError"));
 255         class_java_lang_NoSuchFieldError =
 256                 class_new(utf_new_char("java/lang/NoSuchFieldError"));
 257         class_java_lang_ClassFormatError =
 258                 class_new(utf_new_char("java/lang/ClassFormatError"));
 259         class_java_io_SyncFailedException =
 260                 class_new(utf_new_char("java/io/SyncFailedException"));
 261         class_java_io_UnixFileSystem =
 262                 class_new(utf_new_char("java/io/UnixFileSystem"));
 263         class_java_lang_System =
 264                 class_new(utf_new_char("java/lang/System"));
 265         class_java_lang_ClassLoader =
 266                 class_new(utf_new_char("java/lang/ClassLoader"));
 267         class_java_security_PrivilegedActionException =
 268                 class_new(utf_new_char("java/security/PrivilegedActionException"));
 269
 270         class_java_net_UnknownHostException =
 271                 loader_load(utf_new_char("java/net/UnknownHostException"));
 272         class_java_net_SocketException =
 273                 loader_load(utf_new_char("java/net/SocketException"));
 274
 275         class_java_lang_IllegalArgumentException =
 276                 class_new(utf_new_char("java/lang/IllegalArgumentException"));
 277         class_java_lang_ArrayIndexOutOfBoundsException =
 278                 class_new(utf_new_char("java/lang/ArrayIndexOutOfBoundsException"));
 279         class_java_lang_NoSuchFieldException =
 280                 class_new(utf_new_char("java/lang/NoSuchFieldException"));
 281         class_java_lang_NoSuchMethodException =
 282                 class_new(utf_new_char("java/lang/NoSuchMethodException"));
 283
 284         /* load classes for wrapping primitive types */
 285         class_java_lang_Double =
 286                 class_new(utf_new_char("java/lang/Double"));
 287         class_java_lang_Float =
 288                 class_new(utf_new_char("java/lang/Float"));
 289         class_java_lang_Character =
 290                 class_new(utf_new_char("java/lang/Character"));
 291         class_java_lang_Integer =
 292                 class_new(utf_new_char("java/lang/Integer"));
 293         class_java_lang_Long =
 294                 class_new(utf_new_char("java/lang/Long"));
 295         class_java_lang_Byte =
 296                 class_new(utf_new_char("java/lang/Byte"));
 297         class_java_lang_Short =
 298                 class_new(utf_new_char("java/lang/Short"));
 299         class_java_lang_Boolean =
 300                 class_new(utf_new_char("java/lang/Boolean"));
 301         class_java_lang_Void =
 302                 class_new(utf_new_char("java/lang/Void"));
 303
 304         /* load to avoid dynamic classloading */
 305         class_new(utf_new_char("sun/net/www/protocol/file/Handler"));
 306         class_new(utf_new_char("sun/net/www/protocol/jar/Handler"));
 307         class_new(utf_new_char("sun/io/CharToByteISO8859_1"));
 308
 309         /* start classloader */
 310         loader_load(utf_new_char("sun/io/ByteToCharISO8859_1"));
 311 }
 312
 313
 314 /*************** adds a class to the vector of loaded classes ****************/
 315
 316 void systemclassloader_addclass(classinfo *c)
 317 {
 318         methodinfo *m;
 319
 320         /* find method addClass of java.lang.ClassLoader */
 321         m = class_resolvemethod(
 322                                                         class_java_lang_ClassLoader,
 323                                                         utf_new_char("addClass"),
 324                                                         utf_new_char("(Ljava/lang/Class;)")
 325                                                         );
 326
 327         if (!m) panic("warning: cannot initialize classloader");
 328
 329         /* prepare class to be passed as argument */
 330         use_class_as_object (c);
 331
 332         /* call 'addClass' */
 333         asm_calljavamethod(m,
 334                                            (java_objectheader*) SystemClassLoader,
 335                                            (java_objectheader*) c,
 336                                            NULL,
 337                                            NULL
 338                                            );
 339 }
 340
 341 /*************** adds a library to the vector of loaded libraries *************/
 342
 343 void systemclassloader_addlibrary(java_objectheader *o)
 344 {
 345         methodinfo *m;
 346
 347         /* find method addElement of java.util.Vector */
 348         m = class_resolvemethod(
 349                                                         loader_load ( utf_new_char ("java/util/Vector") ),
 350                                                         utf_new_char("addElement"),
 351                                                         utf_new_char("(Ljava/lang/Object;)V")
 352                                                         );
 353
 354         if (!m) panic("cannot initialize classloader");
 355
 356         /* call 'addElement' */
 357         asm_calljavamethod(m,
 358                                            SystemClassLoader->nativeLibraries,
 359                                            o,
 360                                            NULL,
 361                                            NULL
 362                                            );
 363 }
 364
 365 /*****************************************************************************
 366
 367         create systemclassloader object and initialize instance fields
 368
 369 ******************************************************************************/
 370
 371 void init_systemclassloader()
 372 {
 373         if (!SystemClassLoader) {
 374                 /* create object and call initializer */
 375                 SystemClassLoader = (java_lang_ClassLoader*) native_new_and_init(class_java_lang_ClassLoader);
 376                 heap_addreference((void**) &SystemClassLoader);
 377
 378                 /* systemclassloader has no parent */
 379                 SystemClassLoader->parent      = NULL;
 380                 SystemClassLoader->initialized = true;
 381         }
 382 }
 383
 384
 385 /********************* add loaded library name  *******************************/
 386
 387 void systemclassloader_addlibname(java_objectheader *o)
 388 {
 389         methodinfo *m;
 390         jfieldID id;
 391
 392         m = class_resolvemethod(loader_load(utf_new_char ("java/util/Vector")),
 393                                                         utf_new_char("addElement"),
 394                                                         utf_new_char("(Ljava/lang/Object;)V")
 395                                                         );
 396
 397         if (!m) panic("cannot initialize classloader");
 398
 399         id = env.GetStaticFieldID(&env,class_java_lang_ClassLoader,"loadedLibraryNames","Ljava/util/Vector;");
 400         if (!id) panic("can not access ClassLoader");
 401
 402         asm_calljavamethod(m,
 403                                            GetStaticObjectField(&env,class_java_lang_ClassLoader,id),
 404                                            o,
 405                                            NULL,
 406                                            NULL
 407                                            );
 408 }
 409
 410
 411 /********************* function: native_setclasspath **************************/
 412
 413 void native_setclasspath (char *path)
 414 {
 415         /* set searchpath for classfiles */
 416         classpath = path;
 417 }
 418
 419 /***************** function: throw_classnotfoundexception *********************/
 420
 421 void throw_classnotfoundexception()
 422 {
 423     if (!class_java_lang_ClassNotFoundException) {
 424         panic("java.lang.ClassNotFoundException not found. Maybe wrong classpath?");
 425     }
 426
 427         /* throws a ClassNotFoundException */
 428         exceptionptr = native_new_and_init (class_java_lang_ClassNotFoundException);
 429 }
 430
 431
 432 /*********************** Function: native_findfunction *************************
 433
 434         Looks up a method (must have the same class name, method name, descriptor
 435         and 'static'ness) and returns a function pointer to it.
 436         Returns: function pointer or NULL (if there is no such method)
 437
 438         Remark: For faster operation, the names/descriptors are converted from C
 439                 strings to Unicode the first time this function is called.
 440
 441 *******************************************************************************/
 442
 443 functionptr native_findfunction(utf *cname, utf *mname,
 444                                                                 utf *desc, bool isstatic)
 445 {
 446         int i;
 447         /* entry of table for fast string comparison */
 448         struct nativecompref *n;
 449         /* for warning message if no function is found */
 450         char *buffer;
 451         int buffer_len;
 452
 453         isstatic = isstatic ? true : false;
 454
 455         if (!nativecompdone) {
 456                 for (i = 0; i < NATIVETABLESIZE; i++) {
 457                         nativecomptable[i].classname  =
 458                                 utf_new_char(nativetable[i].classname);
 459                         nativecomptable[i].methodname =
 460                                 utf_new_char(nativetable[i].methodname);
 461                         nativecomptable[i].descriptor =
 462                                 utf_new_char(nativetable[i].descriptor);
 463                         nativecomptable[i].isstatic   =
 464                                 nativetable[i].isstatic;
 465                         nativecomptable[i].func       =
 466                                 nativetable[i].func;
 467                 }
 468                 nativecompdone = true;
 469         }
 470
 471         for (i = 0; i < NATIVETABLESIZE; i++) {
 472                 n = &(nativecomptable[i]);
 473
 474                 if (cname == n->classname && mname == n->methodname &&
 475                     desc == n->descriptor && isstatic == n->isstatic)
 476                         return n->func;
 477         }
 478
 479         /* no function was found, display warning */
 480
 481         buffer_len =
 482                 utf_strlen(cname) + utf_strlen(mname) + utf_strlen(desc) + 64;
 483
 484         buffer = MNEW(char, buffer_len);
 485
 486         strcpy(buffer, "warning: native function ");
 487         utf_sprint(buffer + strlen(buffer), mname);
 488         strcpy(buffer + strlen(buffer), ": ");
 489         utf_sprint(buffer + strlen(buffer), desc);
 490         strcpy(buffer + strlen(buffer), " not found in class ");
 491         utf_sprint(buffer + strlen(buffer), cname);
 492
 493         log_text(buffer);
 494
 495         MFREE(buffer, char, buffer_len);
 496
 497         return NULL;
 498 }
 499
 500
 501 /********************** function: javastring_new *******************************
 502
 503         creates a new object of type java/lang/String with the text of
 504         the specified utf8-string
 505
 506         return: pointer to the string or NULL if memory is exhausted.
 507
 508 *******************************************************************************/
 509
 510 java_objectheader *javastring_new (utf *u)
 511 {
 512         char *utf_ptr = u->text;        /* current utf character in utf string    */
 513         int utflength = utf_strlen(u);  /* length of utf-string if uncompressed   */
 514         java_lang_String *s;                /* result-string                          */
 515         java_chararray *a;
 516         s4 i;
 517
 518         s = (java_lang_String*) builtin_new (class_java_lang_String);
 519         a = builtin_newarray_char (utflength);
 520
 521         /* javastring or character-array could not be created */
 522         if ((!a) || (!s))
 523                 return NULL;
 524
 525         /* decompress utf-string */
 526         for (i = 0; i < utflength; i++)
 527                 a->data[i] = utf_nextu2(&utf_ptr);
 528
 529         /* set fields of the javastring-object */
 530         s->value  = a;
 531         s->offset = 0;
 532         s->count  = utflength;
 533
 534         return (java_objectheader*) s;
 535 }
 536
 537 /********************** function: javastring_new_char **************************
 538
 539         creates a new java/lang/String object which contains the convertet
 540         C-string passed via text.
 541
 542         return: the object pointer or NULL if memory is exhausted.
 543
 544 *******************************************************************************/
 545
 546 java_objectheader *javastring_new_char (char *text)
 547 {
 548         s4 i;
 549         s4 len = strlen(text); /* length of the string */
 550         java_lang_String *s;   /* result-string */
 551         java_chararray *a;
 552
 553         s = (java_lang_String*) builtin_new(class_java_lang_String);
 554         a = builtin_newarray_char(len);
 555
 556         /* javastring or character-array could not be created */
 557         if ((!a) || (!s)) return NULL;
 558
 559         /* copy text */
 560         for (i = 0; i < len; i++)
 561                 a->data[i] = text[i];
 562
 563         /* set fields of the javastring-object */
 564         s->value = a;
 565         s->offset = 0;
 566         s->count = len;
 567
 568         return (java_objectheader*) s;
 569 }
 570
 571
 572 /************************* function javastring_tochar **************************
 573
 574         converts a Java string into a C string.
 575
 576         return: pointer to C string
 577
 578         Caution: every call of this function overwrites the previous string !!!
 579
 580 *******************************************************************************/
 581
 582 static char stringbuffer[MAXSTRINGSIZE];
 583
 584 char *javastring_tochar (java_objectheader *so)
 585 {
 586         java_lang_String *s = (java_lang_String*) so;
 587         java_chararray *a;
 588         s4 i;
 589
 590         if (!s)
 591                 return "";
 592         a = s->value;
 593         if (!a)
 594                 return "";
 595         if (s->count > MAXSTRINGSIZE)
 596                 return "";
 597         for (i = 0; i < s->count; i++)
 598                 stringbuffer[i] = a->data[s->offset+i];
 599         stringbuffer[i] = '\0';
 600         return stringbuffer;
 601 }
 602
 603
 604 /****************** function class_findfield_approx ****************************
 605
 606         searches in 'classinfo'-structure for a field with the
 607         specified name
 608
 609 *******************************************************************************/
 610
 611 fieldinfo *class_findfield_approx (classinfo *c, utf *name)
 612 {
 613         s4 i;
 614         for (i = 0; i < c->fieldscount; i++) {
 615                 /* compare field names */
 616                 if ((c->fields[i].name == name))
 617                         return &(c->fields[i]);
 618                 }
 619
 620         /* field was not found, raise exception */
 621         exceptionptr = native_new_and_init(class_java_lang_NoSuchFieldException);
 622         return NULL;
 623 }
 624
 625
 626 /********************** function: native_new_and_init *************************
 627
 628         Creates a new object on the heap and calls the initializer.
 629         Returns the object pointer or NULL if memory is exhausted.
 630
 631 *******************************************************************************/
 632
 633 java_objectheader *native_new_and_init(classinfo *c)
 634 {
 635         methodinfo *m;
 636         java_objectheader *o = builtin_new(c);          /*          create object */
 637
 638         if (!o) return NULL;
 639
 640         /* find initializer */
 641
 642         m = class_findmethod(c, utf_new_char("<init>"), utf_new_char("()V"));
 643
 644         if (!m) {                                       /* initializer not found  */
 645                 if (verbose) {
 646                         sprintf(logtext, "Warning: class has no instance-initializer: ");
 647                         utf_sprint(logtext + strlen(logtext), c->name);
 648                         dolog();
 649                 }
 650                 return o;
 651         }
 652
 653         /* call initializer */
 654
 655         asm_calljavamethod(m, o, NULL, NULL, NULL);
 656
 657         return o;
 658 }
 659
 660 /******************** function: stringtable_update ****************************
 661
 662         traverses the javastring hashtable and sets the vftbl-entries of
 663         javastrings which were temporarily set to NULL, because
 664         java.lang.Object was not yet loaded
 665
 666 *******************************************************************************/
 667
 668 void stringtable_update ()
 669 {
 670         java_lang_String *js;
 671         java_chararray *a;
 672         literalstring *s;       /* hashtable entry */
 673         int i;
 674
 675         for (i = 0; i < string_hash.size; i++) {
 676                 s = string_hash.ptr[i];
 677                 if (s) {
 678                         while (s) {
 679
 680                                 js = (java_lang_String *) s->string;
 681
 682                                 if (!js || !(a = js->value)) {
 683                                         /* error in hashtable found */
 684                                         panic("invalid literalstring in hashtable");
 685
 686                                 } else {
 687                                         if (!js->header.vftbl)
 688                                                 /* vftbl of javastring is NULL */
 689                                                 js->header.vftbl = class_java_lang_String -> vftbl;
 690
 691                                         if (!a->header.objheader.vftbl)
 692                                                 /* vftbl of character-array is NULL */
 693                                                 a->header.objheader.vftbl = class_array -> vftbl;
 694
 695                                         /* follow link in external hash chain */
 696                                         s = s->hashlink;
 697                                 }
 698                         }
 699                 }
 700         }
 701 }
 702
 703
 704 /************************* function: u2_utflength ***************************
 705
 706         returns the utf length in bytes of a u2 array
 707
 708 *****************************************************************************/
 709
 710
 711 u4 u2_utflength(u2 *text, u4 u2_length)
 712 {
 713         u4 result_len =  0;  /* utf length in bytes  */
 714         u2 ch;               /* current unicode character */
 715         u4 len;
 716
 717         for (len = 0; len < u2_length; len++) {
 718
 719           /* next unicode character */
 720           ch = *text++;
 721
 722           /* determine bytes required to store unicode character as utf */
 723           if (ch && (ch < 0x80))
 724             result_len++;
 725           else if (ch < 0x800)
 726             result_len += 2;
 727           else
 728             result_len += 3;
 729         }
 730
 731     return result_len;
 732 }
 733
 734 /********************* function: utf_new_u2 ***********************************
 735
 736         make utf symbol from u2 array,
 737         if isclassname is true '.' is replaced by '/'
 738
 739 *******************************************************************************/
 740
 741 utf *utf_new_u2(u2 *unicode_pos, u4 unicode_length, bool isclassname)
 742 {
 743         char *buffer; /* memory buffer for  unicode characters */
 744         char *pos;    /* pointer to current position in buffer */
 745         u4 left;      /* unicode characters left */
 746         u4 buflength; /* utf length in bytes of the u2 array  */
 747         utf *result;  /* resulting utf-string */
 748         int i;
 749
 750         /* determine utf length in bytes and allocate memory */
 751         buflength = u2_utflength(unicode_pos, unicode_length);
 752         buffer    = MNEW(char,buflength);
 753
 754         /* memory allocation failed */
 755         if (!buffer) return NULL;
 756
 757         left = buflength;
 758         pos  = buffer;
 759
 760         for (i = 0; i++ < unicode_length; unicode_pos++) {
 761                 /* next unicode character */
 762                 u2 c = *unicode_pos;
 763
 764                 if ((c != 0) && (c < 0x80)) {
 765                 /* 1 character */
 766                 left--;
 767                 if ((int) left < 0) break;
 768                 /* convert classname */
 769                 if (isclassname && c=='.')
 770                   *pos++ = '/';
 771                 else
 772                   *pos++ = (char) c;
 773                 } else if (c < 0x800) {
 774                 /* 2 characters */
 775                 unsigned char high = c >> 6;
 776                 unsigned char low  = c & 0x3F;
 777                 left = left - 2;
 778                 if ((int) left < 0) break;
 779                 *pos++ = high | 0xC0;
 780                 *pos++ = low  | 0x80;
 781                 } else {
 782                 /* 3 characters */
 783                 char low  = c & 0x3f;
 784                 char mid  = (c >> 6) & 0x3F;
 785                 char high = c >> 12;
 786                 left = left - 3;
 787                 if ((int) left < 0) break;
 788                 *pos++ = high | 0xE0;
 789                 *pos++ = mid  | 0x80;
 790                 *pos++ = low  | 0x80;
 791                 }
 792         }
 793
 794         /* insert utf-string into symbol-table */
 795         result = utf_new(buffer,buflength);
 796         MFREE(buffer, char, buflength);
 797         return result;
 798 }
 799
 800 /********************* function: javastring_toutf *****************************
 801
 802         make utf symbol from javastring
 803
 804 *******************************************************************************/
 805
 806 utf *javastring_toutf(java_lang_String *string, bool isclassname)
 807 {
 808         java_lang_String *str = (java_lang_String *) string;
 809         return utf_new_u2(str->value->data,str->count, isclassname);
 810 }
 811
 812 /********************* function: literalstring_u2 *****************************
 813
 814     searches for the javastring with the specified u2-array in
 815     the string hashtable, if there is no such string a new one is
 816     created
 817
 818     if copymode is true a copy of the u2-array is made
 819
 820 *******************************************************************************/
 821
 822 java_objectheader *literalstring_u2 (java_chararray *a, u4 length, bool copymode )
 823 {
 824     literalstring *s;                /* hashtable element */
 825     java_lang_String *js;            /* u2-array wrapped in javastring */
 826     java_chararray *stringdata;      /* copy of u2-array */
 827     u4 key;
 828     u4 slot;
 829     u2 i;
 830
 831     /* find location in hashtable */
 832     key  = unicode_hashkey (a->data, length);
 833     slot = key & (string_hash.size-1);
 834     s    = string_hash.ptr[slot];
 835
 836     while (s) {
 837
 838       js = (java_lang_String *) s->string;
 839
 840       if (js->count == length) {
 841         /* compare text */
 842         for (i=0; i<length; i++)
 843           if (js->value->data[i] != a->data[i]) goto nomatch;
 844
 845         /* string already in hashtable, free memory */
 846         if (!copymode)
 847           lit_mem_free(a, sizeof(java_chararray) + sizeof(u2)*(length-1)+10);
 848
 849         return (java_objectheader *) js;
 850       }
 851
 852       nomatch:
 853       /* follow link in external hash chain */
 854       s = s->hashlink;
 855     }
 856
 857     if (copymode) {
 858       /* create copy of u2-array for new javastring */
 859       u4 arraysize = sizeof(java_chararray) + sizeof(u2)*(length-1)+10;
 860       stringdata = lit_mem_alloc ( arraysize );
 861       memcpy(stringdata, a, arraysize );
 862     }
 863     else
 864       stringdata = a;
 865
 866     /* location in hashtable found, complete arrayheader */
 867     if (class_array==NULL) panic("class_array not initialized");
 868     stringdata -> header.objheader.vftbl = class_array -> vftbl;
 869     stringdata -> header.size = length;
 870     stringdata -> header.arraytype = ARRAYTYPE_CHAR;
 871
 872     /* create new javastring */
 873     js = LNEW (java_lang_String);
 874     js -> header.vftbl = class_java_lang_String -> vftbl;
 875     js -> value  = stringdata;
 876     js -> offset = 0;
 877     js -> count  = length;
 878
 879     /* create new literalstring */
 880     s = NEW (literalstring);
 881     s->hashlink = string_hash.ptr[slot];
 882     s->string   = (java_objectheader *) js;
 883     string_hash.ptr[slot] = s;
 884
 885     /* update numbe of hashtable entries */
 886     string_hash.entries++;
 887
 888     /* reorganization of hashtable */
 889     if ( string_hash.entries > (string_hash.size*2)) {
 890
 891       /* reorganization of hashtable, average length of
 892          the external chains is approx. 2                */
 893
 894       u4 i;
 895       literalstring *s;
 896       hashtable newhash; /* the new hashtable */
 897
 898       /* create new hashtable, double the size */
 899       init_hashtable(&newhash, string_hash.size*2);
 900       newhash.entries=string_hash.entries;
 901
 902       /* transfer elements to new hashtable */
 903       for (i=0; i<string_hash.size; i++) {
 904         s = string_hash.ptr[i];
 905         while (s) {
 906           literalstring *nexts = s -> hashlink;
 907           js   = (java_lang_String*) s->string;
 908           slot = (unicode_hashkey(js->value->data,js->count)) & (newhash.size-1);
 909
 910           s->hashlink = newhash.ptr[slot];
 911           newhash.ptr[slot] = s;
 912
 913           /* follow link in external hash chain */
 914           s = nexts;
 915         }
 916       }
 917
 918       /* dispose old table */
 919       MFREE (string_hash.ptr, void*, string_hash.size);
 920       string_hash = newhash;
 921     }
 922
 923     return (java_objectheader *) js;
 924 }
 925
 926 /******************** Function: literalstring_new *****************************
 927
 928     creates a new javastring with the text of the utf-symbol
 929     and inserts it into the string hashtable
 930
 931 *******************************************************************************/
 932
 933 java_objectheader *literalstring_new (utf *u)
 934 {
 935     char *utf_ptr = u->text;         /* pointer to current unicode character in utf string */
 936     u4 utflength  = utf_strlen(u);   /* length of utf-string if uncompressed */
 937     java_chararray *a;               /* u2-array constructed from utf string */
 938     u4 i;
 939
 940     /* allocate memory */
 941     a = lit_mem_alloc (sizeof(java_chararray) + sizeof(u2)*(utflength-1)+10 );
 942     /* convert utf-string to u2-array */
 943     for (i=0; i<utflength; i++) a->data[i] = utf_nextu2(&utf_ptr);
 944
 945     return literalstring_u2(a, utflength, false);
 946 }
 947
 948
 949 /********************** function: literalstring_free **************************
 950
 951         removes a javastring from memory
 952
 953 ******************************************************************************/
 954
 955 void literalstring_free (java_objectheader* sobj)
 956 {
 957         java_lang_String *s = (java_lang_String*) sobj;
 958         java_chararray *a = s->value;
 959
 960         log_text("literalstring_free called");
 961
 962         /* dispose memory of java.lang.String object */
 963         LFREE (s, java_lang_String);
 964         /* dispose memory of java-characterarray */
 965         LFREE (a, sizeof(java_chararray) + sizeof(u2)*(a->header.size-1)); /* +10 ?? */
 966 }
 967
 968
 969
 970
 971 void copy_vftbl(vftbl **dest, vftbl *src)
 972 {
 973         *dest = mem_alloc(sizeof(vftbl) + sizeof(methodptr) * (src->vftbllength - 1));
 974         memcpy(*dest, src, sizeof(vftbl) - sizeof(methodptr));
 975         memcpy(&(*dest)->table, &src->table, src->vftbllength * sizeof(methodptr));
 976 }
 977
 978 /*****************************************************************************/
 979 /*****************************************************************************/
 980
 981
 982 /*--------------------------------------------------------*/
 983 void printNativeCall(nativeCall nc) {
 984   int i,j;
 985
 986   printf("\n%s's Native Methods call:\n",nc.classname); fflush(stdout);
 987   for (i=0; i<nc.methCnt; i++) {
 988     printf("\tMethod=%s %s\n",nc.methods[i].methodname, nc.methods[i].descriptor);fflush(stdout);
 989
 990     for (j=0; j<nc.callCnt[i]; j++) {
 991       printf("\t\t<%i,%i>aCalled = %s %s %s\n",i,j,
 992         nc.methods[i].methodCalls[j].classname,
 993         nc.methods[i].methodCalls[j].methodname,
 994         nc.methods[i].methodCalls[j].descriptor);fflush(stdout);
 995       }
 996     }
 997 printf("-+++++--------------------\n");fflush(stdout);
 998 }
 999
1000 /*--------------------------------------------------------*/
1001 void printCompNativeCall(nativeCompCall nc) {
1002   int i,j;
1003 printf("printCompNativeCall BEGIN\n");fflush(stdout);
1004   printf("\n%s's Native Comp Methods call:\n",nc.classname->text);fflush(stdout);
1005   utf_display(nc.classname); fflush(stdout);
1006
1007   for (i=0; i<nc.methCnt; i++) {
1008     printf("\tMethod=%s %s\n",nc.methods[i].methodname->text,nc.methods[i].descriptor->text);fflush(stdout);
1009     utf_display(nc.methods[i].methodname); fflush(stdout);
1010     utf_display(nc.methods[i].descriptor);fflush(stdout);
1011     printf("\n");fflush(stdout);
1012
1013     for (j=0; j<nc.callCnt[i]; j++) {
1014       printf("\t\t<%i,%i>bCalled = ",i,j);fflush(stdout);
1015         utf_display(nc.methods[i].methodCalls[j].classname);fflush(stdout);
1016         utf_display(nc.methods[i].methodCalls[j].methodname); fflush(stdout);
1017         utf_display(nc.methods[i].methodCalls[j].descriptor);fflush(stdout);
1018         printf("\n");fflush(stdout);
1019       }
1020     }
1021 printf("---------------------\n");fflush(stdout);
1022 }
1023
1024
1025 /*--------------------------------------------------------*/
1026 classMeth findNativeMethodCalls(utf *c, utf *m, utf *d )
1027 {
1028     int i = 0;
1029     int j = 0;
1030     int cnt = 0;
1031     classMeth mc;
1032     mc.i_class = i;
1033     mc.j_method = j;
1034     mc.methCnt = cnt;
1035
1036     return mc;
1037 }
1038
1039 /*--------------------------------------------------------*/
1040 nativeCall* findNativeClassCalls(char *aclassname ) {
1041 int i;
1042
1043 for (i=0;i<NATIVECALLSSIZE; i++) {
1044    /* convert table to utf later to speed up search */
1045    if (strcmp(nativeCalls[i].classname, aclassname) == 0)
1046         return &nativeCalls[i];
1047    }
1048
1049 return NULL;
1050 }
1051 /*--------------------------------------------------------*/
1052 /*--------------------------------------------------------*/
1053 void utfNativeCall(nativeCall nc, nativeCompCall *ncc) {
1054   int i,j;
1055
1056
1057   ncc->classname = utf_new_char(nc.classname);
1058   ncc->methCnt = nc.methCnt;
1059
1060   for (i=0; i<nc.methCnt; i++) {
1061     ncc->methods[i].methodname = utf_new_char(nc.methods[i].methodname);
1062     ncc->methods[i].descriptor = utf_new_char(nc.methods[i].descriptor);
1063     ncc->callCnt[i] = nc.callCnt[i];
1064
1065     for (j=0; j<nc.callCnt[i]; j++) {
1066
1067         ncc->methods[i].methodCalls[j].classname  = utf_new_char(nc.methods[i].methodCalls[j].classname);
1068
1069         if (strcmp("", nc.methods[i].methodCalls[j].methodname) != 0) {
1070           ncc->methods[i].methodCalls[j].methodname = utf_new_char(nc.methods[i].methodCalls[j].methodname);
1071           ncc->methods[i].methodCalls[j].descriptor = utf_new_char(nc.methods[i].methodCalls[j].descriptor);
1072           }
1073         else {
1074           ncc->methods[i].methodCalls[j].methodname = NULL;
1075           ncc->methods[i].methodCalls[j].descriptor = NULL;
1076           }
1077       }
1078     }
1079 }
1080
1081
1082
1083 /*--------------------------------------------------------*/
1084
1085 bool natcall2utf(bool natcallcompdone) {
1086 int i;
1087
1088 if (natcallcompdone)
1089         return true;
1090
1091 for (i=0;i<NATIVECALLSSIZE; i++) {
1092    utfNativeCall  (nativeCalls[i], &nativeCompCalls[i]);
1093    }
1094
1095 return true;
1096 }
1097 /*--------------------------------------------------------*/
1098
1099
1100 /*
1101  * These are local overrides for various environment variables in Emacs.
1102  * Please do not remove this and leave it at the end of the file, where
1103  * Emacs will automagically detect them.
1104  * ---------------------------------------------------------------------
1105  * Local variables:
1106  * mode: c
1107  * indent-tabs-mode: t
1108  * c-basic-offset: 4
1109  * tab-width: 4
1110  * End:
1111  */