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 664 2003-11-21 18:24:01Z jowenn $
  35
  36 */
  37
  38 #include <stdlib.h>
  39 #include <unistd.h>
  40 #include <time.h>
  41 #include <math.h>
  42 #include <string.h>
  43 #include <assert.h>
  44 #include <sys/time.h>
  45 #include <utime.h>
  46 #include <sys/utsname.h>
  47
  48 #include "config.h"
  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 #include "../threads/threadio.h"
  72
  73 /* searchpath for classfiles */
  74 static char *classpath;
  75
  76 /* for java-string to char conversion */
  77 #define MAXSTRINGSIZE 1000
  78
  79 /******************** systemclasses required for native methods ***************/
  80
  81 static classinfo *class_java_lang_Class;
  82 static classinfo *class_java_lang_VMClass;
  83 static methodinfo *method_vmclass_init;
  84 /* static classinfo *class_java_lang_Cloneable=0; */ /* now in global.h */
  85 static classinfo *class_java_lang_CloneNotSupportedException;
  86 static classinfo *class_java_lang_System;
  87 static classinfo *class_java_lang_ClassLoader;
  88 static classinfo *class_java_lang_ClassNotFoundException;
  89 static classinfo *class_java_lang_InstantiationException;
  90 static classinfo *class_java_lang_NoSuchMethodError;
  91 static classinfo *class_java_lang_NoSuchFieldError;
  92 static classinfo *class_java_lang_ClassFormatError;
  93 static classinfo *class_java_lang_IllegalArgumentException;
  94 static classinfo *class_java_lang_ArrayIndexOutOfBoundsException;
  95 static classinfo *class_java_lang_NoSuchFieldException;
  96 static classinfo *class_java_io_SyncFailedException;
  97 static classinfo *class_java_io_IOException;
  98 static classinfo *class_java_io_FileNotFoundException;
  99 static classinfo *class_java_io_UnixFileSystem;
 100 static classinfo *class_java_security_PrivilegedActionException;
 101 static classinfo *class_java_net_UnknownHostException;
 102 static classinfo *class_java_net_SocketException;
 103 static classinfo *class_java_lang_NoSuchMethodException;
 104 static classinfo *class_java_lang_Double;
 105 static classinfo *class_java_lang_Float;
 106 static classinfo *class_java_lang_Long;
 107 static classinfo *class_java_lang_Byte;
 108 static classinfo *class_java_lang_Short;
 109 static classinfo *class_java_lang_Boolean;
 110 static classinfo *class_java_lang_Void;
 111 static classinfo *class_java_lang_Character;
 112 static classinfo *class_java_lang_Integer;
 113
 114 /* the system classloader object */
 115 struct java_lang_ClassLoader *SystemClassLoader = NULL;
 116
 117 /* for raising exceptions from native methods */
 118 java_objectheader* exceptionptr = NULL;
 119
 120 /************* use classinfo structure as java.lang.Class object **************/
 121
 122 void use_class_as_object(classinfo *c)
 123 {
 124         if (!class_java_lang_Class)
 125                 class_java_lang_Class =
 126                         class_new ( utf_new_char ("java/lang/Class") );
 127         vftbl *vt = class_java_lang_Class->vftbl;
 128         vftbl *newtbl;
 129         if (!c->classvftbl) {
 130                 c->classvftbl = true;
 131                 copy_vftbl(&newtbl, vt);
 132                 newtbl->class = c->header.vftbl->class;
 133                 newtbl->baseval = c->header.vftbl->baseval;
 134                 newtbl->diffval = c->header.vftbl->diffval;
 135                 c->header.vftbl = newtbl;
 136         }
 137
 138         if (!class_java_lang_VMClass) {
 139                 class_java_lang_VMClass =
 140                                 class_new ( utf_new_char("java/lang/VMClass"));
 141                 method_vmclass_init =
 142                                 class_findmethod(class_java_lang_VMClass,utf_new_char("<init>"),
 143                                         utf_new_char("(Lgnu/classpath/RawData;)V"));
 144                 if (method_vmclass_init==0) {
 145                         class_showmethods(class_java_lang_VMClass);
 146                         panic("Needed class initializer for VMClass could not be found");
 147                 }
 148         }
 149         {
 150                 java_objectheader *vmo = builtin_new (class_java_lang_VMClass);
 151                 asm_calljavamethod (method_vmclass_init, vmo, c, NULL, NULL);
 152                 c->vmClass=(java_lang_VMClass*)vmo;
 153         }
 154 }
 155
 156 /*********************** include Java Native Interface ************************/
 157
 158 #include "jni.c"
 159
 160 /*************************** include native methods ***************************/
 161
 162 #include "nat/Runtime.c"
 163 #include "nat/Thread.c"
 164 #include "nat/VMClass.c"
 165 #include "nat/Method.c"
 166 #include "nat/VMSecurityManager.c"
 167 #include "nat/VMClassLoader.c"
 168 #include "nat/VMObject.c"
 169 #include "nat/Proxy.c"
 170 #include "nat/Field.c"
 171 #include "nat/VMSystem.c"
 172 #include "nat/Constructor.c"
 173 #include "nat/FileChannelImpl.c"
 174 #include "nat/VMObjectStreamClass.c"
 175 #include "nat/JOWENNTest1.c"
 176
 177 #ifdef USE_GTK
 178 #include "nat/GdkGraphics.c"
 179 #include "nat/GtkComponentPeer.c"
 180 #include "nat/GdkPixbufDecoder.c"
 181 #include "nat/GtkScrollPanePeer.c"
 182 #include "nat/GtkFileDialogPeer.c"
 183 #include "nat/GtkLabelPeer.c"
 184 #endif
 185 /************************** tables for methods ********************************/
 186
 187 #undef JOWENN_DEBUG
 188 #undef JOWENN_DEBUG1
 189
 190 /* table for locating native methods */
 191 static struct nativeref {
 192         char *classname;
 193         char *methodname;
 194         char *descriptor;
 195         bool isstatic;
 196         functionptr func;
 197 } nativetable [] = {
 198
 199 #include "nativetable.hh"
 200
 201 };
 202
 203
 204 #define NATIVETABLESIZE  (sizeof(nativetable)/sizeof(struct nativeref))
 205
 206 /* table for fast string comparison */
 207 static struct nativecompref {
 208         utf *classname;
 209         utf *methodname;
 210         utf *descriptor;
 211         bool isstatic;
 212         functionptr func;
 213 } nativecomptable [NATIVETABLESIZE];
 214
 215 /* string comparsion table initialized */
 216 static bool nativecompdone = false;
 217
 218
 219 /******************************************************************************/
 220 /******************************************************************************/
 221 #include "natcalls.h"
 222
 223 /* string call comparison table initialized */
 224
 225 /******************************************************************************/
 226 /******************************************************************************/
 227
 228 /*--------------- native method calls & classes used -------------------------*/
 229
 230
 231
 232
 233 /*********************** function: native_loadclasses **************************
 234
 235         load classes required for native methods
 236
 237 *******************************************************************************/
 238
 239 void native_loadclasses()
 240 {
 241         static int classesLoaded=0; /*temporary hack JoWenn*/
 242         if (classesLoaded) return;
 243         classesLoaded=1;
 244 /*      log_text("loadclasses entered");*/
 245
 246
 247         /*class_java_lang_System =*/
 248                 (void)class_new ( utf_new_char ("java/lang/VMClass") );/*JoWenn*/
 249                 (void)class_new ( utf_new_char ("java/lang/Class") );/*JoWenn*/
 250         /* class_new adds the class to the list of classes to be loaded */
 251         if (!class_java_lang_Cloneable)
 252                 class_java_lang_Cloneable =
 253                         class_new ( utf_new_char ("java/lang/Cloneable") );
 254 /*      log_text("loadclasses: class_java_lang_Cloneable has been initialized");*/
 255         class_java_lang_CloneNotSupportedException =
 256                 class_new ( utf_new_char ("java/lang/CloneNotSupportedException") );
 257         if (!class_java_lang_Class)
 258                 class_java_lang_Class =
 259                         class_new ( utf_new_char ("java/lang/Class") );
 260         class_java_io_IOException =
 261                 class_new(utf_new_char("java/io/IOException"));
 262         class_java_io_FileNotFoundException =
 263                 class_new(utf_new_char("java/io/FileNotFoundException"));
 264         class_java_lang_ClassNotFoundException =
 265                 class_new(utf_new_char("java/lang/ClassNotFoundException"));
 266         class_java_lang_InstantiationException =
 267                 class_new(utf_new_char("java/lang/InstantiationException"));
 268         class_java_lang_NoSuchMethodError =
 269                 class_new(utf_new_char("java/lang/NoSuchMethodError"));
 270         class_java_lang_NoSuchFieldError =
 271                 class_new(utf_new_char("java/lang/NoSuchFieldError"));
 272         class_java_lang_ClassFormatError =
 273                 class_new(utf_new_char("java/lang/ClassFormatError"));
 274         class_java_io_SyncFailedException =
 275                 class_new ( utf_new_char ("java/io/SyncFailedException") );
 276
 277 /*      log_text("native_loadclasses: class_new(\"java/lang/ClassLoader\")");           */
 278         class_java_lang_ClassLoader =
 279                 class_new ( utf_new_char ("java/lang/ClassLoader") );
 280 /*      log_text("native_loadclasses: class_new(\"java/security/PrivilegedActionException\")");         */
 281         class_java_security_PrivilegedActionException =
 282                 class_new(utf_new_char("java/security/PrivilegedActionException"));
 283
 284         class_java_net_UnknownHostException =
 285                 loader_load(utf_new_char("java/net/UnknownHostException"));
 286         class_java_net_SocketException =
 287                 loader_load(utf_new_char("java/net/SocketException"));
 288
 289         class_java_lang_IllegalArgumentException =
 290                 class_new(utf_new_char("java/lang/IllegalArgumentException"));
 291         class_java_lang_ArrayIndexOutOfBoundsException =
 292                 class_new(utf_new_char("java/lang/ArrayIndexOutOfBoundsException"));
 293         class_java_lang_NoSuchFieldException =
 294                 class_new(utf_new_char("java/lang/NoSuchFieldException"));
 295         class_java_lang_NoSuchMethodException =
 296                 class_new(utf_new_char("java/lang/NoSuchMethodException"));
 297
 298         /* load classes for wrapping primitive types */
 299         class_java_lang_Double =
 300                 class_new( utf_new_char ("java/lang/Double") );
 301         class_init(class_java_lang_Double);
 302
 303         class_java_lang_Float =
 304                 class_new(utf_new_char("java/lang/Float"));
 305         class_java_lang_Character =
 306                 class_new(utf_new_char("java/lang/Character"));
 307         class_java_lang_Integer =
 308                 class_new(utf_new_char("java/lang/Integer"));
 309         class_java_lang_Long =
 310                 class_new(utf_new_char("java/lang/Long"));
 311         class_java_lang_Byte =
 312                 class_new(utf_new_char("java/lang/Byte"));
 313         class_java_lang_Short =
 314                 class_new(utf_new_char("java/lang/Short"));
 315         class_java_lang_Boolean =
 316                 class_new(utf_new_char("java/lang/Boolean"));
 317         class_java_lang_Void =
 318                 class_new(utf_new_char("java/lang/Void"));
 319
 320         /* load to avoid dynamic classloading */
 321 /*JoWenn        class_new(utf_new_char("sun/net/www/protocol/file/Handler"));
 322         class_new(utf_new_char("sun/net/www/protocol/jar/Handler"));
 323         class_new(utf_new_char("sun/io/CharToByteISO8859_1"));*/
 324
 325         /* start classloader */
 326 /*JoWenn        loader_load(utf_new_char("sun/io/ByteToCharISO8859_1")); */
 327
 328         classesLoaded=1;
 329         log_text("native_loadclasses finished");
 330 }
 331
 332
 333 /*************** adds a class to the vector of loaded classes ****************/
 334
 335 void systemclassloader_addclass(classinfo *c)
 336 {
 337         methodinfo *m;
 338
 339         /* find method addClass of java.lang.ClassLoader */
 340         m = class_resolvemethod(
 341                                                         class_java_lang_ClassLoader,
 342                                                         utf_new_char("addClass"),
 343                                                         utf_new_char("(Ljava/lang/Class;)")
 344                                                         );
 345
 346         if (!m) panic("warning: cannot initialize classloader");
 347
 348         /* prepare class to be passed as argument */
 349         use_class_as_object (c);
 350
 351         /* call 'addClass' */
 352         asm_calljavamethod(m,
 353                                            (java_objectheader*) SystemClassLoader,
 354                                            (java_objectheader*) c,
 355                                            NULL,
 356                                            NULL
 357                                            );
 358 }
 359
 360 /*************** adds a library to the vector of loaded libraries *************/
 361
 362 void systemclassloader_addlibrary(java_objectheader *o)
 363 {
 364         log_text("systemclassloader_addlibrary");
 365 }
 366
 367 /*****************************************************************************
 368
 369         create systemclassloader object and initialize instance fields
 370
 371 ******************************************************************************/
 372
 373 void init_systemclassloader()
 374 {
 375   if (!SystemClassLoader) {
 376         native_loadclasses();
 377         log_text("Initializing new system class loader");
 378         /* create object and call initializer */
 379         SystemClassLoader = (java_lang_ClassLoader*) native_new_and_init(class_java_lang_ClassLoader);
 380         heap_addreference((void**) &SystemClassLoader);
 381
 382         /* systemclassloader has no parent */
 383         SystemClassLoader->parent      = NULL;
 384         SystemClassLoader->initialized = true;
 385   }
 386   log_text("leaving system class loader");
 387 }
 388
 389
 390 /********************* add loaded library name  *******************************/
 391
 392 void systemclassloader_addlibname(java_objectheader *o)
 393 {
 394         methodinfo *m;
 395         jfieldID id;
 396
 397         m = class_resolvemethod(loader_load(utf_new_char ("java/util/Vector")),
 398                                                         utf_new_char("addElement"),
 399                                                         utf_new_char("(Ljava/lang/Object;)V")
 400                                                         );
 401
 402         if (!m) panic("cannot initialize classloader");
 403
 404         id = envTable.GetStaticFieldID(&env,class_java_lang_ClassLoader,"loadedLibraryNames","Ljava/util/Vector;");
 405         if (!id) panic("can not access ClassLoader");
 406
 407         asm_calljavamethod(m,
 408                                            GetStaticObjectField(&env,class_java_lang_ClassLoader,id),
 409                                            o,
 410                                            NULL,
 411                                            NULL
 412                                            );
 413 }
 414
 415
 416 /********************* function: native_setclasspath **************************/
 417
 418 void native_setclasspath (char *path)
 419 {
 420         /* set searchpath for classfiles */
 421         classpath = path;
 422 }
 423
 424 /***************** function: throw_classnotfoundexception *********************/
 425
 426 void throw_classnotfoundexception()
 427 {
 428     if (!class_java_lang_ClassNotFoundException) {
 429         panic("java.lang.ClassNotFoundException not found. Maybe wrong classpath?");
 430     }
 431
 432         /* throws a ClassNotFoundException */
 433         exceptionptr = native_new_and_init (class_java_lang_ClassNotFoundException);
 434 }
 435
 436
 437 void throw_classnotfoundexception2(utf* classname)
 438 {
 439         if (!class_java_lang_ClassNotFoundException) {
 440                 panic("java.lang.ClassNotFoundException not found. Maybe wrong classpath?");
 441         }
 442
 443         /* throws a ClassNotFoundException */
 444         exceptionptr = native_new_and_init (class_java_lang_ClassNotFoundException);
 445
 446         /*
 447         sprintf (logtext, "Loading class: ");
 448         utf_sprint (logtext+strlen(logtext), classname);
 449         dolog();
 450         log_text("Class not found");
 451         */
 452 }
 453
 454
 455 /*********************** Function: native_findfunction *************************
 456
 457         Looks up a method (must have the same class name, method name, descriptor
 458         and 'static'ness) and returns a function pointer to it.
 459         Returns: function pointer or NULL (if there is no such method)
 460
 461         Remark: For faster operation, the names/descriptors are converted from C
 462                 strings to Unicode the first time this function is called.
 463
 464 *******************************************************************************/
 465
 466 functionptr native_findfunction(utf *cname, utf *mname,
 467                                                                 utf *desc, bool isstatic)
 468 {
 469         int i;
 470         /* entry of table for fast string comparison */
 471         struct nativecompref *n;
 472         /* for warning message if no function is found */
 473         char *buffer;
 474         int buffer_len;
 475
 476         isstatic = isstatic ? true : false;
 477
 478         if (!nativecompdone) {
 479                 for (i = 0; i < NATIVETABLESIZE; i++) {
 480                         nativecomptable[i].classname  =
 481                                 utf_new_char(nativetable[i].classname);
 482                         nativecomptable[i].methodname =
 483                                 utf_new_char(nativetable[i].methodname);
 484                         nativecomptable[i].descriptor =
 485                                 utf_new_char(nativetable[i].descriptor);
 486                         nativecomptable[i].isstatic   =
 487                                 nativetable[i].isstatic;
 488                         nativecomptable[i].func       =
 489                                 nativetable[i].func;
 490                 }
 491                 nativecompdone = true;
 492         }
 493
 494 #ifdef JOWENN_DEBUG
 495         buffer_len =
 496           utf_strlen(cname) + utf_strlen(mname) + utf_strlen(desc) + 64;
 497
 498         buffer = MNEW(char, buffer_len);
 499
 500         strcpy(buffer, "searching matching function in native table:");
 501         utf_sprint(buffer+strlen(buffer), mname);
 502         strcpy(buffer+strlen(buffer), ": ");
 503         utf_sprint(buffer+strlen(buffer), desc);
 504         strcpy(buffer+strlen(buffer), " for class ");
 505         utf_sprint(buffer+strlen(buffer), cname);
 506
 507         log_text(buffer);
 508
 509         MFREE(buffer, char, buffer_len);
 510 #endif
 511
 512         for (i = 0; i < NATIVETABLESIZE; i++) {
 513                 n = &(nativecomptable[i]);
 514
 515                 if (cname == n->classname && mname == n->methodname &&
 516                     desc == n->descriptor && isstatic == n->isstatic)
 517                         return n->func;
 518 #ifdef JOWENN_DEBUG
 519                         else {
 520                                 if (cname == n->classname && mname == n->methodname )  log_text("static and descriptor mismatch");
 521
 522                                 else {
 523                                         buffer_len =
 524                                           utf_strlen(n->classname) + utf_strlen(n->methodname) + utf_strlen(n->descriptor) + 64;
 525
 526                                         buffer = MNEW(char, buffer_len);
 527
 528                                         strcpy(buffer, "comparing with:");
 529                                         utf_sprint(buffer+strlen(buffer), n->methodname);
 530                                         strcpy (buffer+strlen(buffer), ": ");
 531                                         utf_sprint(buffer+strlen(buffer), n->descriptor);
 532                                         strcpy(buffer+strlen(buffer), " for class ");
 533                                         utf_sprint(buffer+strlen(buffer), n->classname);
 534
 535                                         log_text(buffer);
 536
 537                                         MFREE(buffer, char, buffer_len);
 538
 539                                 }
 540                         }
 541 #endif
 542         }
 543
 544
 545         /* no function was found, display warning */
 546
 547         buffer_len =
 548                 utf_strlen(cname) + utf_strlen(mname) + utf_strlen(desc) + 64;
 549
 550         buffer = MNEW(char, buffer_len);
 551
 552         strcpy(buffer, "warning: native function ");
 553         utf_sprint(buffer + strlen(buffer), mname);
 554         strcpy(buffer + strlen(buffer), ": ");
 555         utf_sprint(buffer + strlen(buffer), desc);
 556         strcpy(buffer + strlen(buffer), " not found in class ");
 557         utf_sprint(buffer + strlen(buffer), cname);
 558
 559         log_text(buffer);
 560
 561         MFREE(buffer, char, buffer_len);
 562
 563
 564         exit(1);
 565
 566
 567         return NULL;
 568 }
 569
 570
 571 /********************** function: javastring_new *******************************
 572
 573         creates a new object of type java/lang/String with the text of
 574         the specified utf8-string
 575
 576         return: pointer to the string or NULL if memory is exhausted.
 577
 578 *******************************************************************************/
 579
 580 java_objectheader *javastring_new (utf *u)
 581 {
 582         char *utf_ptr = u->text;        /* current utf character in utf string    */
 583         int utflength = utf_strlen(u);  /* length of utf-string if uncompressed   */
 584         java_lang_String *s;                /* result-string                          */
 585         java_chararray *a;
 586         s4 i;
 587
 588 /*      log_text("javastring_new");*/
 589
 590         s = (java_lang_String*) builtin_new (class_java_lang_String);
 591         a = builtin_newarray_char (utflength);
 592
 593         /* javastring or character-array could not be created */
 594         if ((!a) || (!s))
 595                 return NULL;
 596
 597         /* decompress utf-string */
 598         for (i = 0; i < utflength; i++)
 599                 a->data[i] = utf_nextu2(&utf_ptr);
 600
 601         /* set fields of the javastring-object */
 602         s->value  = a;
 603         s->offset = 0;
 604         s->count  = utflength;
 605
 606         return (java_objectheader*) s;
 607 }
 608
 609 /********************** function: javastring_new_char **************************
 610
 611         creates a new java/lang/String object which contains the convertet
 612         C-string passed via text.
 613
 614         return: the object pointer or NULL if memory is exhausted.
 615
 616 *******************************************************************************/
 617
 618 java_objectheader *javastring_new_char (char *text)
 619 {
 620         s4 i;
 621         s4 len = strlen(text); /* length of the string */
 622         java_lang_String *s;   /* result-string */
 623         java_chararray *a;
 624
 625         /*log_text("javastring_new_char");*/
 626         s = (java_lang_String*) builtin_new (class_java_lang_String);
 627         a = builtin_newarray_char (len);
 628
 629         /* javastring or character-array could not be created */
 630         if ((!a) || (!s)) return NULL;
 631
 632         /* copy text */
 633         for (i = 0; i < len; i++)
 634                 a->data[i] = text[i];
 635
 636         /* set fields of the javastring-object */
 637         s->value = a;
 638         s->offset = 0;
 639         s->count = len;
 640
 641         return (java_objectheader*) s;
 642 }
 643
 644
 645 /************************* function javastring_tochar **************************
 646
 647         converts a Java string into a C string.
 648
 649         return: pointer to C string
 650
 651         Caution: every call of this function overwrites the previous string !!!
 652
 653 *******************************************************************************/
 654
 655 static char stringbuffer[MAXSTRINGSIZE];
 656
 657 char *javastring_tochar (java_objectheader *so)
 658 {
 659         java_lang_String *s = (java_lang_String*) so;
 660         java_chararray *a;
 661         s4 i;
 662
 663         log_text("javastring_tochar");
 664
 665         if (!s)
 666                 return "";
 667         a = s->value;
 668         if (!a)
 669                 return "";
 670         if (s->count > MAXSTRINGSIZE)
 671                 return "";
 672         for (i = 0; i < s->count; i++)
 673                 stringbuffer[i] = a->data[s->offset+i];
 674         stringbuffer[i] = '\0';
 675         return stringbuffer;
 676 }
 677
 678
 679 /****************** function class_findfield_approx ****************************
 680
 681         searches in 'classinfo'-structure for a field with the
 682         specified name
 683
 684 *******************************************************************************/
 685
 686 fieldinfo *class_findfield_approx (classinfo *c, utf *name)
 687 {
 688         s4 i;
 689         for (i = 0; i < c->fieldscount; i++) {
 690                 /* compare field names */
 691                 if ((c->fields[i].name == name))
 692                         return &(c->fields[i]);
 693                 }
 694
 695         /* field was not found, raise exception */
 696         exceptionptr = native_new_and_init(class_java_lang_NoSuchFieldException);
 697         return NULL;
 698 }
 699
 700
 701 /********************** function: native_new_and_init *************************
 702
 703         Creates a new object on the heap and calls the initializer.
 704         Returns the object pointer or NULL if memory is exhausted.
 705
 706 *******************************************************************************/
 707
 708 java_objectheader *native_new_and_init(classinfo *c)
 709 {
 710         methodinfo *m;
 711         java_objectheader *o = builtin_new(c);          /*          create object */
 712
 713         /*
 714         printf("native_new_and_init ");
 715         utf_display(c->name);
 716         printf("\n");
 717         */
 718         if (!o) return NULL;
 719         /* printf("o!=NULL\n"); */
 720         /* find initializer */
 721
 722         m = class_findmethod(c, utf_new_char("<init>"), utf_new_char("()V"));
 723
 724         if (!m) {                                       /* initializer not found  */
 725                 if (verbose) {
 726                         sprintf(logtext, "Warning: class has no instance-initializer: ");
 727                         utf_sprint(logtext + strlen(logtext), c->name);
 728                         dolog();
 729                 }
 730                 return o;
 731         }
 732
 733         /* call initializer */
 734
 735         asm_calljavamethod(m, o, NULL, NULL, NULL);
 736
 737         return o;
 738 }
 739
 740 /******************** function: stringtable_update ****************************
 741
 742         traverses the javastring hashtable and sets the vftbl-entries of
 743         javastrings which were temporarily set to NULL, because
 744         java.lang.Object was not yet loaded
 745
 746 *******************************************************************************/
 747
 748 void stringtable_update ()
 749 {
 750         java_lang_String *js;
 751         java_chararray *a;
 752         literalstring *s;       /* hashtable entry */
 753         int i;
 754
 755         for (i = 0; i < string_hash.size; i++) {
 756                 s = string_hash.ptr[i];
 757                 if (s) {
 758                         while (s) {
 759
 760                                 js = (java_lang_String *) s->string;
 761
 762                                 if (!js || !(a = js->value))
 763                                         /* error in hashtable found */
 764                                         panic("invalid literalstring in hashtable");
 765
 766                                 if (!js->header.vftbl)
 767                                         /* vftbl of javastring is NULL */
 768                                         js->header.vftbl = class_java_lang_String -> vftbl;
 769
 770                                 if (!a->header.objheader.vftbl)
 771                                         /* vftbl of character-array is NULL */
 772                                         a->header.objheader.vftbl = primitivetype_table[ARRAYTYPE_CHAR].arrayvftbl;
 773
 774                                 /* follow link in external hash chain */
 775                                 s = s->hashlink;
 776                         }
 777                 }
 778         }
 779 }
 780
 781
 782 /************************* function: u2_utflength ***************************
 783
 784         returns the utf length in bytes of a u2 array
 785
 786 *****************************************************************************/
 787
 788
 789 u4 u2_utflength(u2 *text, u4 u2_length)
 790 {
 791         u4 result_len =  0;  /* utf length in bytes  */
 792         u2 ch;               /* current unicode character */
 793         u4 len;
 794
 795         for (len = 0; len < u2_length; len++) {
 796
 797           /* next unicode character */
 798           ch = *text++;
 799
 800           /* determine bytes required to store unicode character as utf */
 801           if (ch && (ch < 0x80))
 802             result_len++;
 803           else if (ch < 0x800)
 804             result_len += 2;
 805           else
 806             result_len += 3;
 807         }
 808
 809     return result_len;
 810 }
 811
 812 /********************* function: utf_new_u2 ***********************************
 813
 814         make utf symbol from u2 array,
 815         if isclassname is true '.' is replaced by '/'
 816
 817 *******************************************************************************/
 818
 819 utf *utf_new_u2(u2 *unicode_pos, u4 unicode_length, bool isclassname)
 820 {
 821         char *buffer; /* memory buffer for  unicode characters */
 822         char *pos;    /* pointer to current position in buffer */
 823         u4 left;      /* unicode characters left */
 824         u4 buflength; /* utf length in bytes of the u2 array  */
 825         utf *result;  /* resulting utf-string */
 826         int i;
 827
 828         /* determine utf length in bytes and allocate memory */
 829         /* printf("utf_new_u2: unicode_length=%d\n",unicode_length);            */
 830         buflength = u2_utflength(unicode_pos, unicode_length);
 831         buffer    = MNEW(char,buflength);
 832
 833         /* memory allocation failed */
 834         if (!buffer) {
 835                 printf("length: %d\n",buflength);
 836                 log_text("utf_new_u2:buffer==NULL");
 837                 return NULL;
 838         }
 839
 840         left = buflength;
 841         pos  = buffer;
 842
 843         for (i = 0; i++ < unicode_length; unicode_pos++) {
 844                 /* next unicode character */
 845                 u2 c = *unicode_pos;
 846
 847                 if ((c != 0) && (c < 0x80)) {
 848                 /* 1 character */
 849                 left--;
 850                 if ((int) left < 0) break;
 851                 /* convert classname */
 852                 if (isclassname && c=='.')
 853                   *pos++ = '/';
 854                 else
 855                   *pos++ = (char) c;
 856                 } else if (c < 0x800) {
 857                 /* 2 characters */
 858                 unsigned char high = c >> 6;
 859                 unsigned char low  = c & 0x3F;
 860                 left = left - 2;
 861                 if ((int) left < 0) break;
 862                 *pos++ = high | 0xC0;
 863                 *pos++ = low  | 0x80;
 864                 } else {
 865                 /* 3 characters */
 866                 char low  = c & 0x3f;
 867                 char mid  = (c >> 6) & 0x3F;
 868                 char high = c >> 12;
 869                 left = left - 3;
 870                 if ((int) left < 0) break;
 871                 *pos++ = high | 0xE0;
 872                 *pos++ = mid  | 0x80;
 873                 *pos++ = low  | 0x80;
 874                 }
 875         }
 876
 877         /* insert utf-string into symbol-table */
 878         result = utf_new(buffer,buflength);
 879
 880         MFREE(buffer, char, buflength);
 881         return result;
 882 }
 883
 884 /********************* function: javastring_toutf *****************************
 885
 886         make utf symbol from javastring
 887
 888 *******************************************************************************/
 889
 890 utf *javastring_toutf(java_lang_String *string, bool isclassname)
 891 {
 892         java_lang_String *str = (java_lang_String *) string;
 893 /*      printf("javastring_toutf offset: %d, len %d\n",str->offset, str->count);
 894         fflush(stdout);*/
 895         return utf_new_u2(str->value->data+str->offset,str->count, isclassname);
 896 }
 897
 898 /********************* function: literalstring_u2 *****************************
 899
 900     searches for the javastring with the specified u2-array in
 901     the string hashtable, if there is no such string a new one is
 902     created
 903
 904     if copymode is true a copy of the u2-array is made
 905
 906 *******************************************************************************/
 907
 908 java_objectheader *literalstring_u2 (java_chararray *a, u4 length, bool copymode )
 909 {
 910     literalstring *s;                /* hashtable element */
 911     java_lang_String *js;            /* u2-array wrapped in javastring */
 912     java_chararray *stringdata;      /* copy of u2-array */
 913     u4 key;
 914     u4 slot;
 915     u2 i;
 916
 917 #if JOWENN_DEBUG1
 918     printf("literalstring_u2: length: %d\n",length);
 919     log_text("literalstring_u2");
 920 #endif
 921
 922     /* find location in hashtable */
 923     key  = unicode_hashkey (a->data, length);
 924     slot = key & (string_hash.size-1);
 925     s    = string_hash.ptr[slot];
 926
 927     while (s) {
 928
 929       js = (java_lang_String *) s->string;
 930
 931       if (js->count == length) {
 932         /* compare text */
 933         for (i=0; i<length; i++)
 934           if (js->value->data[i] != a->data[i]) goto nomatch;
 935
 936         /* string already in hashtable, free memory */
 937         if (!copymode)
 938           lit_mem_free(a, sizeof(java_chararray) + sizeof(u2)*(length-1)+10);
 939
 940 #ifdef JOWENN_DEBUG1
 941         log_text("literalstring_u2: foundentry");
 942         utf_display(javastring_toutf(js,0));
 943 #endif
 944         return (java_objectheader *) js;
 945       }
 946
 947       nomatch:
 948       /* follow link in external hash chain */
 949       s = s->hashlink;
 950     }
 951
 952     if (copymode) {
 953       /* create copy of u2-array for new javastring */
 954       u4 arraysize = sizeof(java_chararray) + sizeof(u2)*(length-1)+10;
 955       stringdata = lit_mem_alloc ( arraysize );
 956       memcpy(stringdata, a, arraysize );
 957     }
 958     else
 959       stringdata = a;
 960
 961     /* location in hashtable found, complete arrayheader */
 962     stringdata -> header.objheader.vftbl = primitivetype_table[ARRAYTYPE_CHAR].arrayvftbl;
 963     stringdata -> header.size = length;
 964
 965     /* create new javastring */
 966     js = LNEW (java_lang_String);
 967     js -> header.vftbl = class_java_lang_String -> vftbl;
 968     js -> value  = stringdata;
 969     js -> offset = 0;
 970     js -> count  = length;
 971
 972     /* create new literalstring */
 973     s = NEW (literalstring);
 974     s->hashlink = string_hash.ptr[slot];
 975     s->string   = (java_objectheader *) js;
 976     string_hash.ptr[slot] = s;
 977
 978     /* update numbe of hashtable entries */
 979     string_hash.entries++;
 980
 981     /* reorganization of hashtable */
 982     if ( string_hash.entries > (string_hash.size*2)) {
 983
 984       /* reorganization of hashtable, average length of
 985          the external chains is approx. 2                */
 986
 987       u4 i;
 988       literalstring *s;
 989       hashtable newhash; /* the new hashtable */
 990
 991       /* create new hashtable, double the size */
 992       init_hashtable(&newhash, string_hash.size*2);
 993       newhash.entries=string_hash.entries;
 994
 995       /* transfer elements to new hashtable */
 996       for (i=0; i<string_hash.size; i++) {
 997         s = string_hash.ptr[i];
 998         while (s) {
 999           literalstring *nexts = s -> hashlink;
1000           js   = (java_lang_String*) s->string;
1001           slot = (unicode_hashkey(js->value->data,js->count)) & (newhash.size-1);
1002
1003           s->hashlink = newhash.ptr[slot];
1004           newhash.ptr[slot] = s;
1005
1006           /* follow link in external hash chain */
1007           s = nexts;
1008         }
1009       }
1010
1011       /* dispose old table */
1012       MFREE (string_hash.ptr, void*, string_hash.size);
1013       string_hash = newhash;
1014     }
1015 #ifdef JOWENN_DEBUG1
1016         log_text("literalstring_u2: newly created");
1017 /*      utf_display(javastring_toutf(js,0));*/
1018 #endif
1019
1020     return (java_objectheader *) js;
1021 }
1022
1023 /******************** Function: literalstring_new *****************************
1024
1025     creates a new javastring with the text of the utf-symbol
1026     and inserts it into the string hashtable
1027
1028 *******************************************************************************/
1029
1030 java_objectheader *literalstring_new (utf *u)
1031 {
1032     char *utf_ptr = u->text;         /* pointer to current unicode character in utf string */
1033     u4 utflength  = utf_strlen(u);   /* length of utf-string if uncompressed */
1034     java_chararray *a;               /* u2-array constructed from utf string */
1035     u4 i;
1036 /*    log_text("literalstring_new"); */
1037 /*    utf_display(u);*/
1038     /*if (utflength==0) while (1) sleep(60);*/
1039 /*    log_text("------------------");    */
1040     /* allocate memory */
1041     a = lit_mem_alloc (sizeof(java_chararray) + sizeof(u2)*(utflength-1)+10 );
1042     /* convert utf-string to u2-array */
1043     for (i=0; i<utflength; i++) a->data[i] = utf_nextu2(&utf_ptr);
1044
1045     return literalstring_u2(a, utflength, false);
1046 }
1047
1048
1049 /********************** function: literalstring_free **************************
1050
1051         removes a javastring from memory
1052
1053 ******************************************************************************/
1054
1055 void literalstring_free (java_objectheader* sobj)
1056 {
1057         java_lang_String *s = (java_lang_String*) sobj;
1058         java_chararray *a = s->value;
1059
1060         log_text("literalstring_free called");
1061
1062         /* dispose memory of java.lang.String object */
1063         LFREE (s, java_lang_String);
1064         /* dispose memory of java-characterarray */
1065         LFREE (a, sizeof(java_chararray) + sizeof(u2)*(a->header.size-1)); /* +10 ?? */
1066 }
1067
1068
1069
1070
1071 void copy_vftbl(vftbl **dest, vftbl *src)
1072 {
1073     *dest = src;
1074 #if 0
1075     /* XXX this kind of copying does not work (in the general
1076      * case). The interface tables would have to be copied, too. I
1077      * don't see why we should make a copy anyway. -Edwin
1078      */
1079         *dest = mem_alloc(sizeof(vftbl) + sizeof(methodptr)*(src->vftbllength-1));
1080         memcpy(*dest, src, sizeof(vftbl) - sizeof(methodptr));
1081         memcpy(&(*dest)->table, &src->table, src->vftbllength * sizeof(methodptr));
1082 #endif
1083 }
1084
1085 /*****************************************************************************/
1086 /*****************************************************************************/
1087
1088
1089 /*--------------------------------------------------------*/
1090 void printNativeCall(nativeCall nc) {
1091   int i,j;
1092
1093   printf("\n%s's Native Methods call:\n",nc.classname); fflush(stdout);
1094   for (i=0; i<nc.methCnt; i++) {
1095       printf("\tMethod=%s %s\n",nc.methods[i].methodname, nc.methods[i].descriptor);fflush(stdout);
1096
1097     for (j=0; j<nc.callCnt[i]; j++) {
1098         printf("\t\t<%i,%i>aCalled = %s %s %s\n",i,j,
1099         nc.methods[i].methodCalls[j].classname,
1100         nc.methods[i].methodCalls[j].methodname,
1101         nc.methods[i].methodCalls[j].descriptor);fflush(stdout);
1102       }
1103     }
1104   printf("-+++++--------------------\n");fflush(stdout);
1105 }
1106
1107 /*--------------------------------------------------------*/
1108 void printCompNativeCall(nativeCompCall nc) {
1109   int i,j;
1110   printf("printCompNativeCall BEGIN\n");fflush(stdout);
1111   printf("\n%s's Native Comp Methods call:\n",nc.classname->text);fflush(stdout);
1112   utf_display(nc.classname); fflush(stdout);
1113
1114   for (i=0; i<nc.methCnt; i++) {
1115     printf("\tMethod=%s %s\n",nc.methods[i].methodname->text,nc.methods[i].descriptor->text);fflush(stdout);
1116     utf_display(nc.methods[i].methodname); fflush(stdout);
1117     utf_display(nc.methods[i].descriptor);fflush(stdout);
1118     printf("\n");fflush(stdout);
1119
1120     for (j=0; j<nc.callCnt[i]; j++) {
1121       printf("\t\t<%i,%i>bCalled = ",i,j);fflush(stdout);
1122         utf_display(nc.methods[i].methodCalls[j].classname);fflush(stdout);
1123         utf_display(nc.methods[i].methodCalls[j].methodname); fflush(stdout);
1124         utf_display(nc.methods[i].methodCalls[j].descriptor);fflush(stdout);
1125         printf("\n");fflush(stdout);
1126       }
1127     }
1128 printf("---------------------\n");fflush(stdout);
1129 }
1130
1131
1132 /*--------------------------------------------------------*/
1133 classMeth findNativeMethodCalls(utf *c, utf *m, utf *d )
1134 {
1135     int i = 0;
1136     int j = 0;
1137     int cnt = 0;
1138     classMeth mc;
1139     mc.i_class = i;
1140     mc.j_method = j;
1141     mc.methCnt = cnt;
1142
1143     return mc;
1144 }
1145
1146 /*--------------------------------------------------------*/
1147 nativeCall* findNativeClassCalls(char *aclassname ) {
1148 int i;
1149
1150 for (i=0;i<NATIVECALLSSIZE; i++) {
1151    /* convert table to utf later to speed up search */
1152    if (strcmp(nativeCalls[i].classname, aclassname) == 0)
1153         return &nativeCalls[i];
1154    }
1155
1156 return NULL;
1157 }
1158 /*--------------------------------------------------------*/
1159 /*--------------------------------------------------------*/
1160 void utfNativeCall(nativeCall nc, nativeCompCall *ncc) {
1161   int i,j;
1162
1163
1164   ncc->classname = utf_new_char(nc.classname);
1165   ncc->methCnt = nc.methCnt;
1166
1167   for (i=0; i<nc.methCnt; i++) {
1168     ncc->methods[i].methodname = utf_new_char(nc.methods[i].methodname);
1169     ncc->methods[i].descriptor = utf_new_char(nc.methods[i].descriptor);
1170     ncc->callCnt[i] = nc.callCnt[i];
1171
1172     for (j=0; j<nc.callCnt[i]; j++) {
1173
1174         ncc->methods[i].methodCalls[j].classname  = utf_new_char(nc.methods[i].methodCalls[j].classname);
1175
1176         if (strcmp("", nc.methods[i].methodCalls[j].methodname) != 0) {
1177           ncc->methods[i].methodCalls[j].methodname = utf_new_char(nc.methods[i].methodCalls[j].methodname);
1178           ncc->methods[i].methodCalls[j].descriptor = utf_new_char(nc.methods[i].methodCalls[j].descriptor);
1179           }
1180         else {
1181           ncc->methods[i].methodCalls[j].methodname = NULL;
1182           ncc->methods[i].methodCalls[j].descriptor = NULL;
1183           }
1184       }
1185     }
1186 }
1187
1188
1189
1190 /*--------------------------------------------------------*/
1191
1192 bool natcall2utf(bool natcallcompdone) {
1193 int i;
1194
1195 if (natcallcompdone)
1196         return true;
1197
1198 for (i=0;i<NATIVECALLSSIZE; i++) {
1199    utfNativeCall  (nativeCalls[i], &nativeCompCalls[i]);
1200    }
1201
1202 return true;
1203 }
1204 /*--------------------------------------------------------*/
1205
1206
1207 /*
1208  * These are local overrides for various environment variables in Emacs.
1209  * Please do not remove this and leave it at the end of the file, where
1210  * Emacs will automagically detect them.
1211  * ---------------------------------------------------------------------
1212  * Local variables:
1213  * mode: c
1214  * indent-tabs-mode: t
1215  * c-basic-offset: 4
1216  * tab-width: 4
1217  * End:
1218  */