src/vm/class.c

   1 /* src/vm/class.c - class related functions
   2
   3    Copyright (C) 1996-2005, 2006 R. Grafl, A. Krall, C. Kruegel,
   4    C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
   5    E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
   6    J. Wenninger, Institut f. Computersprachen - TU Wien
   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., 51 Franklin Street, Fifth Floor, Boston, MA
  23    02110-1301, USA.
  24
  25    Contact: cacao@cacaojvm.org
  26
  27    Authors: Reinhard Grafl
  28
  29    Changes: Mark Probst
  30             Andreas Krall
  31             Christian Thalinger
  32                         Edwin Steiner
  33
  34    $Id: class.c 5250 2006-08-18 12:24:10Z twisti $
  35
  36 */
  37
  38
  39 #include "config.h"
  40
  41 #include <assert.h>
  42 #include <stdio.h>
  43 #include <string.h>
  44
  45 #include "vm/types.h"
  46
  47 #include "mm/memory.h"
  48
  49 #if defined(ENABLE_THREADS)
  50 # include "threads/native/threads.h"
  51 #endif
  52
  53 #include "toolbox/logging.h"
  54 #include "vm/class.h"
  55 #include "vm/classcache.h"
  56 #include "vm/exceptions.h"
  57 #include "vm/global.h"
  58 #include "vm/loader.h"
  59 #include "vm/options.h"
  60 #include "vm/resolve.h"
  61 #include "vm/statistics.h"
  62 #include "vm/stringlocal.h"
  63 #include "vm/utf8.h"
  64
  65
  66 /******************************************************************************/
  67 /* DEBUG HELPERS                                                              */
  68 /******************************************************************************/
  69
  70 #ifndef NDEBUG
  71 #define CLASS_DEBUG
  72 #endif
  73
  74 #ifdef CLASS_DEBUG
  75 #define CLASS_ASSERT(cond)  assert(cond)
  76 #else
  77 #define CLASS_ASSERT(cond)
  78 #endif
  79
  80
  81 /* global variables ***********************************************************/
  82
  83 list unlinkedclasses;                   /* this is only used for eager class  */
  84                                         /* loading                            */
  85
  86
  87 /* frequently used classes ****************************************************/
  88
  89 /* important system classes */
  90
  91 classinfo *class_java_lang_Object;
  92 classinfo *class_java_lang_Class;
  93 classinfo *class_java_lang_ClassLoader;
  94 classinfo *class_java_lang_Cloneable;
  95 classinfo *class_java_lang_SecurityManager;
  96 classinfo *class_java_lang_String;
  97 classinfo *class_java_lang_System;
  98 classinfo *class_java_lang_Thread;
  99 classinfo *class_java_lang_ThreadGroup;
 100 classinfo *class_java_lang_VMSystem;
 101 classinfo *class_java_lang_VMThread;
 102 classinfo *class_java_io_Serializable;
 103
 104
 105 /* system exception classes required in cacao */
 106
 107 classinfo *class_java_lang_Throwable;
 108 classinfo *class_java_lang_VMThrowable;
 109 classinfo *class_java_lang_Error;
 110 classinfo *class_java_lang_AbstractMethodError;
 111 classinfo *class_java_lang_LinkageError;
 112 classinfo *class_java_lang_NoClassDefFoundError;
 113 classinfo *class_java_lang_NoSuchMethodError;
 114 classinfo *class_java_lang_OutOfMemoryError;
 115
 116 classinfo *class_java_lang_Exception;
 117 classinfo *class_java_lang_ClassCastException;
 118 classinfo *class_java_lang_ClassNotFoundException;
 119 classinfo *class_java_lang_IllegalArgumentException;
 120 classinfo *class_java_lang_IllegalMonitorStateException;
 121
 122 classinfo *class_java_lang_Void;
 123 classinfo *class_java_lang_Boolean;
 124 classinfo *class_java_lang_Byte;
 125 classinfo *class_java_lang_Character;
 126 classinfo *class_java_lang_Short;
 127 classinfo *class_java_lang_Integer;
 128 classinfo *class_java_lang_Long;
 129 classinfo *class_java_lang_Float;
 130 classinfo *class_java_lang_Double;
 131
 132
 133 /* some runtime exception */
 134
 135 classinfo *class_java_lang_NullPointerException;
 136
 137
 138 /* some classes which may be used more often */
 139
 140 classinfo *class_java_lang_StackTraceElement;
 141 classinfo *class_java_lang_reflect_Constructor;
 142 classinfo *class_java_lang_reflect_Field;
 143 classinfo *class_java_lang_reflect_Method;
 144 classinfo *class_java_security_PrivilegedAction;
 145 classinfo *class_java_util_Vector;
 146
 147 classinfo *arrayclass_java_lang_Object;
 148
 149
 150 /* pseudo classes for the typechecker */
 151
 152 classinfo *pseudo_class_Arraystub;
 153 classinfo *pseudo_class_Null;
 154 classinfo *pseudo_class_New;
 155
 156
 157 /* class_set_packagename *******************************************************
 158
 159    Derive the package name from the class name and store it in the struct.
 160
 161 *******************************************************************************/
 162
 163 void class_set_packagename(classinfo *c)
 164 {
 165         char *p = UTF_END(c->name) - 1;
 166         char *start = c->name->text;
 167
 168         /* set the package name */
 169         /* classes in the unnamed package keep packagename == NULL */
 170
 171         if (c->name->text[0] == '[') {
 172                 /* set packagename of arrays to the element's package */
 173
 174                 for (; *start == '['; start++);
 175
 176                 /* skip the 'L' in arrays of references */
 177                 if (*start == 'L')
 178                         start++;
 179
 180                 for (; (p > start) && (*p != '/'); --p);
 181
 182                 c->packagename = utf_new(start, p - start);
 183
 184         } else {
 185                 for (; (p > start) && (*p != '/'); --p);
 186
 187                 c->packagename = utf_new(start, p - start);
 188         }
 189 }
 190
 191
 192 /* class_create_classinfo ******************************************************
 193
 194    Create a new classinfo struct. The class name is set to the given utf *,
 195    most other fields are initialized to zero.
 196
 197    Note: classname may be NULL. In this case a not-yet-named classinfo is
 198          created. The name must be filled in later and class_set_packagename
 199                  must be called after that.
 200
 201 *******************************************************************************/
 202
 203 classinfo *class_create_classinfo(utf *classname)
 204 {
 205         classinfo *c;
 206
 207 #if defined(ENABLE_STATISTICS)
 208         if (opt_stat)
 209                 size_classinfo += sizeof(classinfo);
 210 #endif
 211
 212         /* we use a safe name for temporarily unnamed classes */
 213         if (!classname)
 214                 classname = utf_not_named_yet;
 215
 216 #if !defined(NDEBUG)
 217         if (initverbose)
 218                 log_message_utf("Creating class: ", classname);
 219 #endif
 220
 221         /* GCNEW_UNCOLLECTABLE clears the allocated memory */
 222
 223         c = GCNEW_UNCOLLECTABLE(classinfo, 1);
 224         /*c=NEW(classinfo);*/
 225         c->name = classname;
 226
 227         /* set the header.vftbl of all loaded classes to the one of
 228        java.lang.Class, so Java code can use a class as object */
 229
 230         if (class_java_lang_Class)
 231                 if (class_java_lang_Class->vftbl)
 232                         c->object.header.vftbl = class_java_lang_Class->vftbl;
 233
 234         if (classname != utf_not_named_yet)
 235                 class_set_packagename(c);
 236
 237 #if defined(ENABLE_THREADS)
 238         lock_init_object_lock(&c->object.header);
 239 #endif
 240
 241         return c;
 242 }
 243
 244
 245 /* class_postset_header_vftbl **************************************************
 246
 247    Set the header.vftbl of all classes created before java.lang.Class
 248    was linked.  This is necessary that Java code can use a class as
 249    object.
 250
 251 *******************************************************************************/
 252
 253 void class_postset_header_vftbl(void)
 254 {
 255         classinfo *c;
 256         u4 slot;
 257         classcache_name_entry *nmen;
 258         classcache_class_entry *clsen;
 259
 260         assert(class_java_lang_Class);
 261
 262         for (slot = 0; slot < hashtable_classcache.size; slot++) {
 263                 nmen = (classcache_name_entry *) hashtable_classcache.ptr[slot];
 264
 265                 for (; nmen; nmen = nmen->hashlink) {
 266                         /* iterate over all class entries */
 267
 268                         for (clsen = nmen->classes; clsen; clsen = clsen->next) {
 269                                 c = clsen->classobj;
 270
 271                                 /* now set the the vftbl */
 272
 273                                 if (c->object.header.vftbl == NULL)
 274                                         c->object.header.vftbl = class_java_lang_Class->vftbl;
 275                         }
 276                 }
 277         }
 278 }
 279
 280
 281 /* class_freepool **************************************************************
 282
 283         Frees all resources used by this classes Constant Pool.
 284
 285 *******************************************************************************/
 286
 287 static void class_freecpool(classinfo *c)
 288 {
 289         u4 idx;
 290         u4 tag;
 291         voidptr info;
 292
 293         if (c->cptags && c->cpinfos) {
 294                 for (idx = 0; idx < c->cpcount; idx++) {
 295                         tag = c->cptags[idx];
 296                         info = c->cpinfos[idx];
 297
 298                         if (info != NULL) {
 299                                 switch (tag) {
 300                                 case CONSTANT_Fieldref:
 301                                 case CONSTANT_Methodref:
 302                                 case CONSTANT_InterfaceMethodref:
 303                                         FREE(info, constant_FMIref);
 304                                         break;
 305                                 case CONSTANT_Integer:
 306                                         FREE(info, constant_integer);
 307                                         break;
 308                                 case CONSTANT_Float:
 309                                         FREE(info, constant_float);
 310                                         break;
 311                                 case CONSTANT_Long:
 312                                         FREE(info, constant_long);
 313                                         break;
 314                                 case CONSTANT_Double:
 315                                         FREE(info, constant_double);
 316                                         break;
 317                                 case CONSTANT_NameAndType:
 318                                         FREE(info, constant_nameandtype);
 319                                         break;
 320                                 }
 321                         }
 322                 }
 323         }
 324
 325         if (c->cptags)
 326                 MFREE(c->cptags, u1, c->cpcount);
 327
 328         if (c->cpinfos)
 329                 MFREE(c->cpinfos, voidptr, c->cpcount);
 330 }
 331
 332
 333 /* class_getconstant ***********************************************************
 334
 335    Retrieves the value at position 'pos' of the constantpool of a
 336    class. If the type of the value is other than 'ctype', an error is
 337    thrown.
 338
 339 *******************************************************************************/
 340
 341 voidptr class_getconstant(classinfo *c, u4 pos, u4 ctype)
 342 {
 343         /* check index and type of constantpool entry */
 344         /* (pos == 0 is caught by type comparison) */
 345
 346         if (pos >= c->cpcount || c->cptags[pos] != ctype) {
 347                 *exceptionptr = new_classformaterror(c, "Illegal constant pool index");
 348                 return NULL;
 349         }
 350
 351         return c->cpinfos[pos];
 352 }
 353
 354
 355 /* innerclass_getconstant ******************************************************
 356
 357    Like class_getconstant, but if cptags is ZERO, null is returned.
 358
 359 *******************************************************************************/
 360
 361 voidptr innerclass_getconstant(classinfo *c, u4 pos, u4 ctype)
 362 {
 363         /* invalid position in constantpool */
 364         if (pos >= c->cpcount) {
 365                 *exceptionptr = new_classformaterror(c, "Illegal constant pool index");
 366                 return NULL;
 367         }
 368
 369         /* constantpool entry of type 0 */
 370         if (!c->cptags[pos])
 371                 return NULL;
 372
 373         /* check type of constantpool entry */
 374         if (c->cptags[pos] != ctype) {
 375                 *exceptionptr = new_classformaterror(c, "Illegal constant pool index");
 376                 return NULL;
 377         }
 378
 379         return c->cpinfos[pos];
 380 }
 381
 382
 383 /* class_free ******************************************************************
 384
 385    Frees all resources used by the class.
 386
 387 *******************************************************************************/
 388
 389 void class_free(classinfo *c)
 390 {
 391         s4 i;
 392         vftbl_t *v;
 393
 394         class_freecpool(c);
 395
 396         if (c->interfaces)
 397                 MFREE(c->interfaces, classinfo*, c->interfacescount);
 398
 399         if (c->fields) {
 400                 for (i = 0; i < c->fieldscount; i++)
 401                         field_free(&(c->fields[i]));
 402 /*      MFREE(c->fields, fieldinfo, c->fieldscount); */
 403         }
 404
 405         if (c->methods) {
 406                 for (i = 0; i < c->methodscount; i++)
 407                         method_free(&(c->methods[i]));
 408                 MFREE(c->methods, methodinfo, c->methodscount);
 409         }
 410
 411         if ((v = c->vftbl) != NULL) {
 412                 if (v->arraydesc)
 413                         mem_free(v->arraydesc,sizeof(arraydescriptor));
 414
 415                 for (i = 0; i < v->interfacetablelength; i++) {
 416                         MFREE(v->interfacetable[-i], methodptr, v->interfacevftbllength[i]);
 417                 }
 418                 MFREE(v->interfacevftbllength, s4, v->interfacetablelength);
 419
 420                 i = sizeof(vftbl_t) + sizeof(methodptr) * (v->vftbllength - 1) +
 421                     sizeof(methodptr*) * (v->interfacetablelength -
 422                                          (v->interfacetablelength > 0));
 423                 v = (vftbl_t*) (((methodptr*) v) -
 424                                                 (v->interfacetablelength - 1) * (v->interfacetablelength > 1));
 425                 mem_free(v, i);
 426         }
 427
 428         if (c->innerclass)
 429                 MFREE(c->innerclass, innerclassinfo, c->innerclasscount);
 430
 431         /*      if (c->classvftbl)
 432                 mem_free(c->header.vftbl, sizeof(vftbl) + sizeof(methodptr)*(c->vftbl->vftbllength-1)); */
 433
 434 /*      GCFREE(c); */
 435 }
 436
 437
 438 /* get_array_class *************************************************************
 439
 440    Returns the array class with the given name for the given
 441    classloader, or NULL if an exception occurred.
 442
 443    Note: This function does eager loading.
 444
 445 *******************************************************************************/
 446
 447 static classinfo *get_array_class(utf *name,java_objectheader *initloader,
 448                                                                                         java_objectheader *defloader,bool link)
 449 {
 450         classinfo *c;
 451
 452         /* lookup this class in the classcache */
 453         c = classcache_lookup(initloader,name);
 454         if (!c)
 455                 c = classcache_lookup_defined(defloader,name);
 456
 457         if (!c) {
 458                 /* we have to create it */
 459                 c = class_create_classinfo(name);
 460                 c = load_newly_created_array(c,initloader);
 461                 if (c == NULL)
 462                         return NULL;
 463         }
 464
 465         CLASS_ASSERT(c);
 466         CLASS_ASSERT(c->state & CLASS_LOADED);
 467         CLASS_ASSERT(c->classloader == defloader);
 468
 469         if (link && !(c->state & CLASS_LINKED))
 470                 if (!link_class(c))
 471                         return NULL;
 472
 473         CLASS_ASSERT(!link || (c->state & CLASS_LINKED));
 474
 475         return c;
 476 }
 477
 478
 479 /* class_array_of **************************************************************
 480
 481    Returns an array class with the given component class. The array
 482    class is dynamically created if neccessary.
 483
 484 *******************************************************************************/
 485
 486 classinfo *class_array_of(classinfo *component, bool link)
 487 {
 488     s4 namelen;
 489     char *namebuf;
 490
 491     /* Assemble the array class name */
 492     namelen = component->name->blength;
 493
 494     if (component->name->text[0] == '[') {
 495         /* the component is itself an array */
 496         namebuf = DMNEW(char, namelen + 1);
 497         namebuf[0] = '[';
 498         MCOPY(namebuf + 1, component->name->text, char, namelen);
 499         namelen++;
 500
 501     } else {
 502         /* the component is a non-array class */
 503         namebuf = DMNEW(char, namelen + 3);
 504         namebuf[0] = '[';
 505         namebuf[1] = 'L';
 506         MCOPY(namebuf + 2, component->name->text, char, namelen);
 507         namebuf[2 + namelen] = ';';
 508         namelen += 3;
 509     }
 510
 511         return get_array_class(utf_new(namebuf, namelen),
 512                                                    component->classloader,
 513                                                    component->classloader,
 514                                                    link);
 515 }
 516
 517
 518 /* class_multiarray_of *********************************************************
 519
 520    Returns an array class with the given dimension and element class.
 521    The array class is dynamically created if neccessary.
 522
 523 *******************************************************************************/
 524
 525 classinfo *class_multiarray_of(s4 dim, classinfo *element, bool link)
 526 {
 527     s4 namelen;
 528     char *namebuf;
 529
 530         if (dim < 1) {
 531                 log_text("Invalid array dimension requested");
 532                 assert(0);
 533         }
 534
 535     /* Assemble the array class name */
 536     namelen = element->name->blength;
 537
 538     if (element->name->text[0] == '[') {
 539         /* the element is itself an array */
 540         namebuf = DMNEW(char, namelen + dim);
 541         memcpy(namebuf + dim, element->name->text, namelen);
 542         namelen += dim;
 543     }
 544     else {
 545         /* the element is a non-array class */
 546         namebuf = DMNEW(char, namelen + 2 + dim);
 547         namebuf[dim] = 'L';
 548         memcpy(namebuf + dim + 1, element->name->text, namelen);
 549         namelen += (2 + dim);
 550         namebuf[namelen - 1] = ';';
 551     }
 552         memset(namebuf, '[', dim);
 553
 554         return get_array_class(utf_new(namebuf, namelen),
 555                                                    element->classloader,
 556                                                    element->classloader,
 557                                                    link);
 558 }
 559
 560
 561 /* class_lookup_classref *******************************************************
 562
 563    Looks up the constant_classref for a given classname in the classref
 564    tables of a class.
 565
 566    IN:
 567        cls..............the class containing the reference
 568            name.............the name of the class refered to
 569
 570     RETURN VALUE:
 571            a pointer to a constant_classref, or
 572            NULL if the reference was not found
 573
 574 *******************************************************************************/
 575
 576 constant_classref *class_lookup_classref(classinfo *cls, utf *name)
 577 {
 578         constant_classref *ref;
 579         extra_classref *xref;
 580         int count;
 581
 582         CLASS_ASSERT(cls);
 583         CLASS_ASSERT(name);
 584         CLASS_ASSERT(!cls->classrefcount || cls->classrefs);
 585
 586         /* first search the main classref table */
 587         count = cls->classrefcount;
 588         ref = cls->classrefs;
 589         for (; count; --count, ++ref)
 590                 if (ref->name == name)
 591                         return ref;
 592
 593         /* next try the list of extra classrefs */
 594         for (xref = cls->extclassrefs; xref; xref = xref->next) {
 595                 if (xref->classref.name == name)
 596                         return &(xref->classref);
 597         }
 598
 599         /* not found */
 600         return NULL;
 601 }
 602
 603
 604 /* class_get_classref **********************************************************
 605
 606    Returns the constant_classref for a given classname.
 607
 608    IN:
 609        cls..............the class containing the reference
 610            name.............the name of the class refered to
 611
 612    RETURN VALUE:
 613        a pointer to a constant_classref (never NULL)
 614
 615    NOTE:
 616        The given name is not checked for validity!
 617
 618 *******************************************************************************/
 619
 620 constant_classref *class_get_classref(classinfo *cls, utf *name)
 621 {
 622         constant_classref *ref;
 623         extra_classref *xref;
 624
 625         CLASS_ASSERT(cls);
 626         CLASS_ASSERT(name);
 627
 628         ref = class_lookup_classref(cls,name);
 629         if (ref)
 630                 return ref;
 631
 632         xref = NEW(extra_classref);
 633         CLASSREF_INIT(xref->classref,cls,name);
 634
 635         xref->next = cls->extclassrefs;
 636         cls->extclassrefs = xref;
 637
 638         return &(xref->classref);
 639 }
 640
 641
 642 /* class_get_self_classref *****************************************************
 643
 644    Returns the constant_classref to the class itself.
 645
 646    IN:
 647        cls..............the class containing the reference
 648
 649    RETURN VALUE:
 650        a pointer to a constant_classref (never NULL)
 651
 652 *******************************************************************************/
 653
 654 constant_classref *class_get_self_classref(classinfo *cls)
 655 {
 656         /* XXX this should be done in a faster way. Maybe always make */
 657         /* the classref of index 0 a self reference.                  */
 658         return class_get_classref(cls,cls->name);
 659 }
 660
 661 /* class_get_classref_multiarray_of ********************************************
 662
 663    Returns an array type reference with the given dimension and element class
 664    reference.
 665
 666    IN:
 667        dim..............the requested dimension
 668                             dim must be in [1;255]. This is NOT checked!
 669            ref..............the component class reference
 670
 671    RETURN VALUE:
 672        a pointer to the class reference for the array type
 673
 674    NOTE:
 675        The referer of `ref` is used as the referer for the new classref.
 676
 677 *******************************************************************************/
 678
 679 constant_classref *class_get_classref_multiarray_of(s4 dim, constant_classref *ref)
 680 {
 681     s4 namelen;
 682     char *namebuf;
 683
 684         CLASS_ASSERT(ref);
 685         CLASS_ASSERT(dim >= 1 && dim <= 255);
 686
 687     /* Assemble the array class name */
 688     namelen = ref->name->blength;
 689
 690     if (ref->name->text[0] == '[') {
 691         /* the element is itself an array */
 692         namebuf = DMNEW(char, namelen + dim);
 693         memcpy(namebuf + dim, ref->name->text, namelen);
 694         namelen += dim;
 695     }
 696     else {
 697         /* the element is a non-array class */
 698         namebuf = DMNEW(char, namelen + 2 + dim);
 699         namebuf[dim] = 'L';
 700         memcpy(namebuf + dim + 1, ref->name->text, namelen);
 701         namelen += (2 + dim);
 702         namebuf[namelen - 1] = ';';
 703     }
 704         memset(namebuf, '[', dim);
 705
 706     return class_get_classref(ref->referer,utf_new(namebuf, namelen));
 707 }
 708
 709
 710 /* class_get_classref_component_of *********************************************
 711
 712    Returns the component classref of a given array type reference
 713
 714    IN:
 715        ref..............the array type reference
 716
 717    RETURN VALUE:
 718        a reference to the component class, or
 719            NULL if `ref` is not an object array type reference
 720
 721    NOTE:
 722        The referer of `ref` is used as the referer for the new classref.
 723
 724 *******************************************************************************/
 725
 726 constant_classref *class_get_classref_component_of(constant_classref *ref)
 727 {
 728         s4 namelen;
 729         char *name;
 730
 731         CLASS_ASSERT(ref);
 732
 733         name = ref->name->text;
 734         if (*name++ != '[')
 735                 return NULL;
 736
 737         namelen = ref->name->blength - 1;
 738         if (*name == 'L') {
 739                 name++;
 740                 namelen -= 2;
 741         }
 742         else if (*name != '[') {
 743                 return NULL;
 744         }
 745
 746     return class_get_classref(ref->referer, utf_new(name, namelen));
 747 }
 748
 749
 750 /* class_findmethod ************************************************************
 751
 752    Searches a 'classinfo' structure for a method having the given name
 753    and descriptor. If descriptor is NULL, it is ignored.
 754
 755 *******************************************************************************/
 756
 757 methodinfo *class_findmethod(classinfo *c, utf *name, utf *desc)
 758 {
 759         methodinfo *m;
 760         s4          i;
 761
 762         for (i = 0; i < c->methodscount; i++) {
 763                 m = &(c->methods[i]);
 764
 765                 if ((m->name == name) && ((desc == NULL) || (m->descriptor == desc)))
 766                         return m;
 767         }
 768
 769         return NULL;
 770 }
 771
 772
 773 /* class_resolvemethod *********************************************************
 774
 775    Searches a class and it's super classes for a method.
 776
 777    Superinterfaces are *not* searched.
 778
 779 *******************************************************************************/
 780
 781 methodinfo *class_resolvemethod(classinfo *c, utf *name, utf *desc)
 782 {
 783         methodinfo *m;
 784
 785         while (c) {
 786                 m = class_findmethod(c, name, desc);
 787
 788                 if (m)
 789                         return m;
 790
 791                 /* JVM Specification bug:
 792
 793                    It is important NOT to resolve special <init> and <clinit>
 794                    methods to super classes or interfaces; yet, this is not
 795                    explicited in the specification.  Section 5.4.3.3 should be
 796                    updated appropriately.  */
 797
 798                 if (name == utf_init || name == utf_clinit)
 799                         return NULL;
 800
 801                 c = c->super.cls;
 802         }
 803
 804         return NULL;
 805 }
 806
 807
 808 /* class_resolveinterfacemethod_intern *****************************************
 809
 810    Internally used helper function. Do not use this directly.
 811
 812 *******************************************************************************/
 813
 814 static methodinfo *class_resolveinterfacemethod_intern(classinfo *c,
 815                                                                                                            utf *name, utf *desc)
 816 {
 817         methodinfo *m;
 818         s4          i;
 819
 820         /* try to find the method in the class */
 821
 822         m = class_findmethod(c, name, desc);
 823
 824         if (m != NULL)
 825                 return m;
 826
 827         /* no method found? try the superinterfaces */
 828
 829         for (i = 0; i < c->interfacescount; i++) {
 830                 m = class_resolveinterfacemethod_intern(c->interfaces[i].cls,
 831                                                                                                         name, desc);
 832
 833                 if (m != NULL)
 834                         return m;
 835         }
 836
 837         /* no method found */
 838
 839         return NULL;
 840 }
 841
 842
 843 /* class_resolveclassmethod ****************************************************
 844
 845    Resolves a reference from REFERER to a method with NAME and DESC in
 846    class C.
 847
 848    If the method cannot be resolved the return value is NULL. If
 849    EXCEPT is true *exceptionptr is set, too.
 850
 851 *******************************************************************************/
 852
 853 methodinfo *class_resolveclassmethod(classinfo *c, utf *name, utf *desc,
 854                                                                          classinfo *referer, bool throwexception)
 855 {
 856         classinfo  *cls;
 857         methodinfo *m;
 858         s4          i;
 859
 860 /*      if (c->flags & ACC_INTERFACE) { */
 861 /*              if (throwexception) */
 862 /*                      *exceptionptr = */
 863 /*                              new_exception(string_java_lang_IncompatibleClassChangeError); */
 864 /*              return NULL; */
 865 /*      } */
 866
 867         /* try class c and its superclasses */
 868
 869         cls = c;
 870
 871         m = class_resolvemethod(cls, name, desc);
 872
 873         if (m != NULL)
 874                 goto found;
 875
 876         /* try the superinterfaces */
 877
 878         for (i = 0; i < c->interfacescount; i++) {
 879                 m = class_resolveinterfacemethod_intern(c->interfaces[i].cls,
 880                                                                                                 name, desc);
 881
 882                 if (m != NULL)
 883                         goto found;
 884         }
 885
 886         if (throwexception)
 887                 exceptions_throw_nosuchmethoderror(c, name, desc);
 888
 889         return NULL;
 890
 891  found:
 892         if ((m->flags & ACC_ABSTRACT) && !(c->flags & ACC_ABSTRACT)) {
 893                 if (throwexception)
 894                         exceptions_throw_abstractmethoderror();
 895
 896                 return NULL;
 897         }
 898
 899         /* XXX check access rights */
 900
 901         return m;
 902 }
 903
 904
 905 /* class_resolveinterfacemethod ************************************************
 906
 907    Resolves a reference from REFERER to a method with NAME and DESC in
 908    interface C.
 909
 910    If the method cannot be resolved the return value is NULL. If
 911    EXCEPT is true *exceptionptr is set, too.
 912
 913 *******************************************************************************/
 914
 915 methodinfo *class_resolveinterfacemethod(classinfo *c, utf *name, utf *desc,
 916                                                                                  classinfo *referer, bool throwexception)
 917 {
 918         methodinfo *mi;
 919
 920         if (!(c->flags & ACC_INTERFACE)) {
 921                 if (throwexception)
 922                         *exceptionptr =
 923                                 new_exception(string_java_lang_IncompatibleClassChangeError);
 924
 925                 return NULL;
 926         }
 927
 928         mi = class_resolveinterfacemethod_intern(c, name, desc);
 929
 930         if (mi)
 931                 return mi;
 932
 933         /* try class java.lang.Object */
 934
 935         mi = class_findmethod(class_java_lang_Object, name, desc);
 936
 937         if (mi)
 938                 return mi;
 939
 940         if (throwexception)
 941                 *exceptionptr =
 942                         exceptions_new_nosuchmethoderror(c, name, desc);
 943
 944         return NULL;
 945 }
 946
 947
 948 /* class_findfield *************************************************************
 949
 950    Searches for field with specified name and type in a classinfo
 951    structure. If no such field is found NULL is returned.
 952
 953 *******************************************************************************/
 954
 955 fieldinfo *class_findfield(classinfo *c, utf *name, utf *desc)
 956 {
 957         s4 i;
 958
 959         for (i = 0; i < c->fieldscount; i++)
 960                 if ((c->fields[i].name == name) && (c->fields[i].descriptor == desc))
 961                         return &(c->fields[i]);
 962
 963         if (c->super.cls)
 964                 return class_findfield(c->super.cls, name, desc);
 965
 966         return NULL;
 967 }
 968
 969
 970 /* class_findfield_approx ******************************************************
 971
 972    Searches in 'classinfo'-structure for a field with the specified
 973    name.
 974
 975 *******************************************************************************/
 976
 977 fieldinfo *class_findfield_by_name(classinfo *c, utf *name)
 978 {
 979         s4 i;
 980
 981         /* get field index */
 982
 983         i = class_findfield_index_by_name(c, name);
 984
 985         /* field was not found, return */
 986
 987         if (i == -1)
 988                 return NULL;
 989
 990         /* return field address */
 991
 992         return &(c->fields[i]);
 993 }
 994
 995
 996 s4 class_findfield_index_by_name(classinfo *c, utf *name)
 997 {
 998         s4 i;
 999
1000         for (i = 0; i < c->fieldscount; i++) {
1001                 /* compare field names */
1002
1003                 if ((c->fields[i].name == name))
1004                         return i;
1005         }
1006
1007         /* field was not found, raise exception */
1008
1009         *exceptionptr = new_exception(string_java_lang_NoSuchFieldException);
1010
1011         return -1;
1012 }
1013
1014
1015 /****************** Function: class_resolvefield_int ***************************
1016
1017     This is an internally used helper function. Do not use this directly.
1018
1019         Tries to resolve a field having the given name and type.
1020     If the field cannot be resolved, NULL is returned.
1021
1022 *******************************************************************************/
1023
1024 static fieldinfo *class_resolvefield_int(classinfo *c, utf *name, utf *desc)
1025 {
1026         fieldinfo *fi;
1027         s4         i;
1028
1029         /* search for field in class c */
1030
1031         for (i = 0; i < c->fieldscount; i++) {
1032                 if ((c->fields[i].name == name) && (c->fields[i].descriptor == desc)) {
1033                         return &(c->fields[i]);
1034                 }
1035     }
1036
1037         /* try superinterfaces recursively */
1038
1039         for (i = 0; i < c->interfacescount; i++) {
1040                 fi = class_resolvefield_int(c->interfaces[i].cls, name, desc);
1041                 if (fi)
1042                         return fi;
1043         }
1044
1045         /* try superclass */
1046
1047         if (c->super.cls)
1048                 return class_resolvefield_int(c->super.cls, name, desc);
1049
1050         /* not found */
1051
1052         return NULL;
1053 }
1054
1055
1056 /********************* Function: class_resolvefield ***************************
1057
1058         Resolves a reference from REFERER to a field with NAME and DESC in class C.
1059
1060     If the field cannot be resolved the return value is NULL. If EXCEPT is
1061     true *exceptionptr is set, too.
1062
1063 *******************************************************************************/
1064
1065 fieldinfo *class_resolvefield(classinfo *c, utf *name, utf *desc,
1066                                                           classinfo *referer, bool throwexception)
1067 {
1068         fieldinfo *fi;
1069
1070         fi = class_resolvefield_int(c, name, desc);
1071
1072         if (!fi) {
1073                 if (throwexception)
1074                         *exceptionptr =
1075                                 new_exception_utfmessage(string_java_lang_NoSuchFieldError,
1076                                                                                  name);
1077
1078                 return NULL;
1079         }
1080
1081         /* XXX check access rights */
1082
1083         return fi;
1084 }
1085
1086
1087 /* class_issubclass ************************************************************
1088
1089    Checks if sub is a descendant of super.
1090
1091 *******************************************************************************/
1092
1093 bool class_issubclass(classinfo *sub, classinfo *super)
1094 {
1095         for (;;) {
1096                 if (!sub)
1097                         return false;
1098
1099                 if (sub == super)
1100                         return true;
1101
1102                 sub = sub->super.cls;
1103         }
1104 }
1105
1106
1107 /* class_printflags ************************************************************
1108
1109    Prints flags of a class.
1110
1111 *******************************************************************************/
1112
1113 #if !defined(NDEBUG)
1114 void class_printflags(classinfo *c)
1115 {
1116         if (c == NULL) {
1117                 printf("NULL");
1118                 return;
1119         }
1120
1121         if (c->flags & ACC_PUBLIC)       printf(" PUBLIC");
1122         if (c->flags & ACC_PRIVATE)      printf(" PRIVATE");
1123         if (c->flags & ACC_PROTECTED)    printf(" PROTECTED");
1124         if (c->flags & ACC_STATIC)       printf(" STATIC");
1125         if (c->flags & ACC_FINAL)        printf(" FINAL");
1126         if (c->flags & ACC_SYNCHRONIZED) printf(" SYNCHRONIZED");
1127         if (c->flags & ACC_VOLATILE)     printf(" VOLATILE");
1128         if (c->flags & ACC_TRANSIENT)    printf(" TRANSIENT");
1129         if (c->flags & ACC_NATIVE)       printf(" NATIVE");
1130         if (c->flags & ACC_INTERFACE)    printf(" INTERFACE");
1131         if (c->flags & ACC_ABSTRACT)     printf(" ABSTRACT");
1132 }
1133 #endif
1134
1135
1136 /* class_print *****************************************************************
1137
1138    Prints classname plus flags.
1139
1140 *******************************************************************************/
1141
1142 #if !defined(NDEBUG)
1143 void class_print(classinfo *c)
1144 {
1145         if (c == NULL) {
1146                 printf("NULL");
1147                 return;
1148         }
1149
1150         utf_display_printable_ascii(c->name);
1151         class_printflags(c);
1152 }
1153 #endif
1154
1155
1156 /* class_classref_print ********************************************************
1157
1158    Prints classname plus referer class.
1159
1160 *******************************************************************************/
1161
1162 #if !defined(NDEBUG)
1163 void class_classref_print(constant_classref *cr)
1164 {
1165         if (cr == NULL) {
1166                 printf("NULL");
1167                 return;
1168         }
1169
1170         utf_display_printable_ascii(cr->name);
1171         printf("(ref.by ");
1172         if (cr->referer)
1173                 class_print(cr->referer);
1174         else
1175                 printf("NULL");
1176         printf(")");
1177 }
1178 #endif
1179
1180
1181 /* class_println ***************************************************************
1182
1183    Prints classname plus flags and new line.
1184
1185 *******************************************************************************/
1186
1187 #if !defined(NDEBUG)
1188 void class_println(classinfo *c)
1189 {
1190         class_print(c);
1191         printf("\n");
1192 }
1193 #endif
1194
1195
1196 /* class_classref_println ******************************************************
1197
1198    Prints classname plus referer class and new line.
1199
1200 *******************************************************************************/
1201
1202 #if !defined(NDEBUG)
1203 void class_classref_println(constant_classref *cr)
1204 {
1205         class_classref_print(cr);
1206         printf("\n");
1207 }
1208 #endif
1209
1210
1211 /* class_showconstantpool ******************************************************
1212
1213    Dump the constant pool of the given class to stdout.
1214
1215 *******************************************************************************/
1216
1217 #if !defined(NDEBUG)
1218 void class_showconstantpool (classinfo *c)
1219 {
1220         u4 i;
1221         voidptr e;
1222
1223         printf ("---- dump of constant pool ----\n");
1224
1225         for (i=0; i<c->cpcount; i++) {
1226                 printf ("#%d:  ", (int) i);
1227
1228                 e = c -> cpinfos [i];
1229                 if (e) {
1230
1231                         switch (c -> cptags [i]) {
1232                         case CONSTANT_Class:
1233                                 printf ("Classreference -> ");
1234                                 utf_display_printable_ascii ( ((constant_classref*)e) -> name );
1235                                 break;
1236                         case CONSTANT_Fieldref:
1237                                 printf ("Fieldref -> ");
1238                                 field_fieldref_print((constant_FMIref *) e);
1239                                 break;
1240                         case CONSTANT_Methodref:
1241                                 printf ("Methodref -> ");
1242                                 method_methodref_print((constant_FMIref *) e);
1243                                 break;
1244                         case CONSTANT_InterfaceMethodref:
1245                                 printf ("InterfaceMethod -> ");
1246                                 method_methodref_print((constant_FMIref *) e);
1247                                 break;
1248                         case CONSTANT_String:
1249                                 printf ("String -> ");
1250                                 utf_display_printable_ascii (e);
1251                                 break;
1252                         case CONSTANT_Integer:
1253                                 printf ("Integer -> %d", (int) ( ((constant_integer*)e) -> value) );
1254                                 break;
1255                         case CONSTANT_Float:
1256                                 printf ("Float -> %f", ((constant_float*)e) -> value);
1257                                 break;
1258                         case CONSTANT_Double:
1259                                 printf ("Double -> %f", ((constant_double*)e) -> value);
1260                                 break;
1261                         case CONSTANT_Long:
1262                                 {
1263                                         u8 v = ((constant_long*)e) -> value;
1264 #if U8_AVAILABLE
1265                                         printf ("Long -> %ld", (long int) v);
1266 #else
1267                                         printf ("Long -> HI: %ld, LO: %ld\n",
1268                                                         (long int) v.high, (long int) v.low);
1269 #endif
1270                                 }
1271                                 break;
1272                         case CONSTANT_NameAndType:
1273                                 {
1274                                         constant_nameandtype *cnt = e;
1275                                         printf ("NameAndType: ");
1276                                         utf_display_printable_ascii (cnt->name);
1277                                         printf (" ");
1278                                         utf_display_printable_ascii (cnt->descriptor);
1279                                 }
1280                                 break;
1281                         case CONSTANT_Utf8:
1282                                 printf ("Utf8 -> ");
1283                                 utf_display_printable_ascii (e);
1284                                 break;
1285                         default:
1286                                 log_text("Invalid type of ConstantPool-Entry");
1287                                 assert(0);
1288                         }
1289                 }
1290
1291                 printf ("\n");
1292         }
1293 }
1294 #endif /* !defined(NDEBUG) */
1295
1296
1297 /* class_showmethods ***********************************************************
1298
1299    Dump info about the fields and methods of the given class to stdout.
1300
1301 *******************************************************************************/
1302
1303 #if !defined(NDEBUG)
1304 void class_showmethods (classinfo *c)
1305 {
1306         s4 i;
1307
1308         printf("--------- Fields and Methods ----------------\n");
1309         printf("Flags: ");
1310         class_printflags(c);
1311         printf("\n");
1312
1313         printf("This: ");
1314         utf_display_printable_ascii(c->name);
1315         printf("\n");
1316
1317         if (c->super.cls) {
1318                 printf("Super: ");
1319                 utf_display_printable_ascii(c->super.cls->name);
1320                 printf ("\n");
1321         }
1322
1323         printf("Index: %d\n", c->index);
1324
1325         printf("Interfaces:\n");
1326         for (i = 0; i < c->interfacescount; i++) {
1327                 printf("   ");
1328                 utf_display_printable_ascii(c->interfaces[i].cls->name);
1329                 printf (" (%d)\n", c->interfaces[i].cls->index);
1330         }
1331
1332         printf("Fields:\n");
1333         for (i = 0; i < c->fieldscount; i++)
1334                 field_println(&(c->fields[i]));
1335
1336         printf("Methods:\n");
1337         for (i = 0; i < c->methodscount; i++) {
1338                 methodinfo *m = &(c->methods[i]);
1339
1340                 if (!(m->flags & ACC_STATIC))
1341                         printf("vftblindex: %d   ", m->vftblindex);
1342
1343                 method_println(m);
1344         }
1345
1346         printf ("Virtual function table:\n");
1347         for (i = 0; i < c->vftbl->vftbllength; i++)
1348                 printf ("entry: %d,  %ld\n", i, (long int) (c->vftbl->table[i]));
1349 }
1350 #endif /* !defined(NDEBUG) */
1351
1352
1353 /*
1354  * These are local overrides for various environment variables in Emacs.
1355  * Please do not remove this and leave it at the end of the file, where
1356  * Emacs will automagically detect them.
1357  * ---------------------------------------------------------------------
1358  * Local variables:
1359  * mode: c
1360  * indent-tabs-mode: t
1361  * c-basic-offset: 4
1362  * tab-width: 4
1363  * End:
1364  * vim:noexpandtab:sw=4:ts=4:
1365  */