src/vmcore/field.c

   1 /* src/vmcore/field.c - field functions
   2
   3    Copyright (C) 1996-2005, 2006, 2007 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    $Id: field.c 8288 2007-08-10 15:12:00Z twisti $
  26
  27 */
  28
  29
  30 #include "config.h"
  31
  32 #include <assert.h>
  33 #include <stdint.h>
  34 #include <stdio.h>
  35
  36 #include "mm/memory.h"
  37
  38 #include "vm/types.h"
  39
  40 #include "mm/memory.h"
  41
  42 #include "vm/exceptions.h"
  43 #include "vm/global.h"
  44 #include "vm/primitive.h"
  45 #include "vm/stringlocal.h"
  46 #include "vm/vm.h"
  47
  48 #include "vmcore/annotation.h"
  49 #include "vmcore/class.h"
  50 #include "vmcore/descriptor.h"
  51 #include "vmcore/field.h"
  52 #include "vmcore/loader.h"
  53 #include "vmcore/options.h"
  54 #include "vmcore/references.h"
  55 #include "vmcore/suck.h"
  56 #include "vmcore/utf8.h"
  57
  58
  59 /* field_load ******************************************************************
  60
  61    Load everything about a class field from the class file and fill a
  62    fieldinfo structure.
  63
  64 *******************************************************************************/
  65
  66 #define field_load_NOVALUE  0xffffffff /* must be bigger than any u2 value! */
  67
  68 bool field_load(classbuffer *cb, fieldinfo *f, descriptor_pool *descpool)
  69 {
  70         classinfo *c;
  71         u4 attrnum, i;
  72         u4 pindex = field_load_NOVALUE;     /* constantvalue_index */
  73         utf *u;
  74
  75         /* Get class. */
  76
  77         c = cb->class;
  78
  79         f->class = c;
  80
  81         /* Get access flags. */
  82
  83         if (!suck_check_classbuffer_size(cb, 2 + 2 + 2))
  84                 return false;
  85
  86         f->flags = suck_u2(cb);
  87
  88         /* Get name. */
  89
  90         if (!(u = class_getconstant(c, suck_u2(cb), CONSTANT_Utf8)))
  91                 return false;
  92
  93         f->name = u;
  94
  95         /* Get descriptor. */
  96
  97         if (!(u = class_getconstant(c, suck_u2(cb), CONSTANT_Utf8)))
  98                 return false;
  99
 100         f->descriptor = u;
 101         f->parseddesc = NULL;
 102
 103         if (!descriptor_pool_add(descpool, u, NULL))
 104                 return false;
 105
 106         /* descriptor_pool_add accepts method descriptors, so we have to
 107            check against them here before the call of
 108            descriptor_to_basic_type below. */
 109
 110         if (u->text[0] == '(') {
 111                 exceptions_throw_classformaterror(c, "Method descriptor used for field");
 112                 return false;
 113         }
 114
 115 #ifdef ENABLE_VERIFIER
 116         if (opt_verify) {
 117                 /* check name */
 118                 if (!is_valid_name_utf(f->name) || f->name->text[0] == '<') {
 119                         exceptions_throw_classformaterror(c,
 120                                                                                           "Illegal Field name \"%s\"",
 121                                                                                           f->name->text);
 122                         return false;
 123                 }
 124
 125                 /* check flag consistency */
 126                 i = f->flags & (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED);
 127
 128                 if ((i != 0 && i != ACC_PUBLIC && i != ACC_PRIVATE && i != ACC_PROTECTED) ||
 129                         ((f->flags & (ACC_FINAL | ACC_VOLATILE)) == (ACC_FINAL | ACC_VOLATILE))) {
 130                         exceptions_throw_classformaterror(c,
 131                                                                                           "Illegal field modifiers: 0x%X",
 132                                                                                           f->flags);
 133                         return false;
 134                 }
 135
 136                 if (c->flags & ACC_INTERFACE) {
 137                         if (((f->flags & (ACC_STATIC | ACC_PUBLIC | ACC_FINAL))
 138                                 != (ACC_STATIC | ACC_PUBLIC | ACC_FINAL)) ||
 139                                 f->flags & ACC_TRANSIENT) {
 140                                 exceptions_throw_classformaterror(c,
 141                                                                                                   "Illegal field modifiers: 0x%X",
 142                                                                                                   f->flags);
 143                                 return false;
 144                         }
 145                 }
 146         }
 147 #endif /* ENABLE_VERIFIER */
 148
 149         /* data type */
 150
 151         f->type = descriptor_to_basic_type(f->descriptor);
 152
 153         /* For static-fields allocate memory for the value and set the
 154            value to 0. */
 155
 156         if (f->flags & ACC_STATIC) {
 157                 switch (f->type) {
 158                 case TYPE_INT:
 159                 case TYPE_LNG:
 160                 case TYPE_FLT:
 161                 case TYPE_DBL:
 162                         f->value = NEW(imm_union);
 163                         break;
 164
 165                 case TYPE_ADR:
 166 #if defined(ENABLE_GC_CACAO)
 167                         f->value = NEW(imm_union);
 168 #else
 169                         f->value = GCNEW_UNCOLLECTABLE(imm_union, 1);
 170 #endif
 171                         break;
 172
 173                 default:
 174                         vm_abort("field_load: invalid field type %d", f->type);
 175                 }
 176
 177                 /* Set the field to zero, for float and double fields set the
 178                    correct 0.0 value. */
 179
 180                 switch (f->type) {
 181                 case TYPE_INT:
 182                 case TYPE_LNG:
 183                 case TYPE_ADR:
 184                         f->value->l = 0;
 185                         break;
 186
 187                 case TYPE_FLT:
 188                         f->value->f = 0.0;
 189                         break;
 190
 191                 case TYPE_DBL:
 192                         f->value->d = 0.0;
 193                         break;
 194                 }
 195         }
 196         else {
 197                 /* For instance-fields set the offset to 0. */
 198
 199                 f->offset = 0;
 200
 201                 /* For final fields, which are not static, we need a value
 202                    structure. */
 203
 204                 if (f->flags & ACC_FINAL) {
 205                         f->value = NEW(imm_union);
 206                         /* XXX hack */
 207                         f->value->l = 0;
 208                 }
 209
 210                 switch (f->type) {
 211                 case TYPE_ADR:
 212                         c->flags |= ACC_CLASS_HAS_POINTERS;
 213                         break;
 214                 }
 215         }
 216
 217         /* read attributes */
 218
 219         if (!suck_check_classbuffer_size(cb, 2))
 220                 return false;
 221
 222         attrnum = suck_u2(cb);
 223
 224         for (i = 0; i < attrnum; i++) {
 225                 if (!suck_check_classbuffer_size(cb, 2))
 226                         return false;
 227
 228                 if (!(u = class_getconstant(c, suck_u2(cb), CONSTANT_Utf8)))
 229                         return false;
 230
 231                 if (u == utf_ConstantValue) {
 232                         if (!suck_check_classbuffer_size(cb, 4 + 2))
 233                                 return false;
 234
 235                         /* check attribute length */
 236
 237                         if (suck_u4(cb) != 2) {
 238                                 exceptions_throw_classformaterror(c, "Wrong size for VALUE attribute");
 239                                 return false;
 240                         }
 241
 242                         /* constant value attribute */
 243
 244                         if (pindex != field_load_NOVALUE) {
 245                                 exceptions_throw_classformaterror(c, "Multiple ConstantValue attributes");
 246                                 return false;
 247                         }
 248
 249                         /* index of value in constantpool */
 250
 251                         pindex = suck_u2(cb);
 252
 253                         /* initialize field with value from constantpool */
 254
 255                         switch (f->type) {
 256                         case TYPE_INT: {
 257                                 constant_integer *ci;
 258
 259                                 if (!(ci = class_getconstant(c, pindex, CONSTANT_Integer)))
 260                                         return false;
 261
 262                                 f->value->i = ci->value;
 263                         }
 264                         break;
 265
 266                         case TYPE_LNG: {
 267                                 constant_long *cl;
 268
 269                                 if (!(cl = class_getconstant(c, pindex, CONSTANT_Long)))
 270                                         return false;
 271
 272                                 f->value->l = cl->value;
 273                         }
 274                         break;
 275
 276                         case TYPE_FLT: {
 277                                 constant_float *cf;
 278
 279                                 if (!(cf = class_getconstant(c, pindex, CONSTANT_Float)))
 280                                         return false;
 281
 282                                 f->value->f = cf->value;
 283                         }
 284                         break;
 285
 286                         case TYPE_DBL: {
 287                                 constant_double *cd;
 288
 289                                 if (!(cd = class_getconstant(c, pindex, CONSTANT_Double)))
 290                                         return false;
 291
 292                                 f->value->d = cd->value;
 293                         }
 294                         break;
 295
 296                         case TYPE_ADR:
 297                                 if (!(u = class_getconstant(c, pindex, CONSTANT_String)))
 298                                         return false;
 299
 300                                 /* Create Java-string from compressed UTF8-string. */
 301
 302                                 f->value->a = literalstring_new(u);
 303                                 break;
 304
 305                         default:
 306                                 vm_abort("field_load: invalid field type %d", f->type);
 307                         }
 308                 }
 309 #if defined(ENABLE_JAVASE)
 310                 else if (u == utf_Signature) {
 311                         /* Signature */
 312
 313                         if (!loader_load_attribute_signature(cb, &(f->signature)))
 314                                 return false;
 315                 }
 316
 317 #if defined(ENABLE_ANNOTATIONS)
 318                 else if (u == utf_RuntimeVisibleAnnotations) {
 319                         /* RuntimeVisibleAnnotations */
 320                         if (!annotation_load_field_attribute_runtimevisibleannotations(cb, f))
 321                                 return false;
 322                 }
 323                 else if (u == utf_RuntimeInvisibleAnnotations) {
 324                         /* RuntimeInvisibleAnnotations */
 325                         if (!annotation_load_field_attribute_runtimeinvisibleannotations(cb, f))
 326                                 return false;
 327                 }
 328 #endif
 329 #endif
 330                 else {
 331                         /* unknown attribute */
 332
 333                         if (!loader_skip_attribute_body(cb))
 334                                 return false;
 335                 }
 336         }
 337
 338         /* everything was ok */
 339
 340         return true;
 341 }
 342
 343
 344 /* field_get_type **************************************************************
 345
 346    Returns the type of the field as class.
 347
 348 *******************************************************************************/
 349
 350 classinfo *field_get_type(fieldinfo *f)
 351 {
 352         typedesc  *td;
 353         utf       *u;
 354         classinfo *c;
 355
 356         td = f->parseddesc;
 357
 358         if (td->type == TYPE_ADR) {
 359                 assert(td->classref);
 360
 361                 u = td->classref->name;
 362
 363                 /* load the class of the field-type with the field's
 364                    classloader */
 365
 366                 c = load_class_from_classloader(u, f->class->classloader);
 367         }
 368         else {
 369                 c = primitive_class_get_by_type(td->decltype);
 370         }
 371
 372         return c;
 373 }
 374
 375
 376 /* field_free ******************************************************************
 377
 378    Frees a fields' resources.
 379
 380 *******************************************************************************/
 381
 382 void field_free(fieldinfo *f)
 383 {
 384         /* empty */
 385 }
 386
 387
 388 #if defined(ENABLE_ANNOTATIONS)
 389 /* field_get_annotations ******************************************************
 390
 391    Gets a fields' annotations (or NULL if none).
 392
 393 *******************************************************************************/
 394
 395 annotation_bytearray_t *field_get_annotations(fieldinfo *f)
 396 {
 397         classinfo *c = f->class;
 398         int slot = f - c->fields;
 399
 400         if (c->field_annotations != NULL &&
 401             c->field_annotations->size > slot) {
 402                 return c->field_annotations->data[slot];
 403         }
 404
 405         return NULL;
 406 }
 407 #endif
 408
 409
 410 /* field_printflags ************************************************************
 411
 412    (debugging only)
 413
 414 *******************************************************************************/
 415
 416 #if !defined(NDEBUG)
 417 void field_printflags(fieldinfo *f)
 418 {
 419         if (f == NULL) {
 420                 printf("NULL");
 421                 return;
 422         }
 423
 424         if (f->flags & ACC_PUBLIC)       printf(" PUBLIC");
 425         if (f->flags & ACC_PRIVATE)      printf(" PRIVATE");
 426         if (f->flags & ACC_PROTECTED)    printf(" PROTECTED");
 427         if (f->flags & ACC_STATIC)       printf(" STATIC");
 428         if (f->flags & ACC_FINAL)        printf(" FINAL");
 429         if (f->flags & ACC_SYNCHRONIZED) printf(" SYNCHRONIZED");
 430         if (f->flags & ACC_VOLATILE)     printf(" VOLATILE");
 431         if (f->flags & ACC_TRANSIENT)    printf(" TRANSIENT");
 432         if (f->flags & ACC_NATIVE)       printf(" NATIVE");
 433         if (f->flags & ACC_INTERFACE)    printf(" INTERFACE");
 434         if (f->flags & ACC_ABSTRACT)     printf(" ABSTRACT");
 435 }
 436 #endif
 437
 438
 439 /* field_print *****************************************************************
 440
 441    (debugging only)
 442
 443 *******************************************************************************/
 444
 445 #if !defined(NDEBUG)
 446 void field_print(fieldinfo *f)
 447 {
 448         if (f == NULL) {
 449                 printf("(fieldinfo*)NULL");
 450                 return;
 451         }
 452
 453         utf_display_printable_ascii_classname(f->class->name);
 454         printf(".");
 455         utf_display_printable_ascii(f->name);
 456         printf(" ");
 457         utf_display_printable_ascii(f->descriptor);
 458
 459         field_printflags(f);
 460 }
 461 #endif
 462
 463
 464 /* field_println ***************************************************************
 465
 466    (debugging only)
 467
 468 *******************************************************************************/
 469
 470 #if !defined(NDEBUG)
 471 void field_println(fieldinfo *f)
 472 {
 473         field_print(f);
 474         printf("\n");
 475 }
 476 #endif
 477
 478 /* field_fieldref_print ********************************************************
 479
 480    (debugging only)
 481
 482 *******************************************************************************/
 483
 484 #if !defined(NDEBUG)
 485 void field_fieldref_print(constant_FMIref *fr)
 486 {
 487         if (fr == NULL) {
 488                 printf("(constant_FMIref *)NULL");
 489                 return;
 490         }
 491
 492         if (IS_FMIREF_RESOLVED(fr)) {
 493                 printf("<field> ");
 494                 field_print(fr->p.field);
 495         }
 496         else {
 497                 printf("<fieldref> ");
 498                 utf_display_printable_ascii_classname(fr->p.classref->name);
 499                 printf(".");
 500                 utf_display_printable_ascii(fr->name);
 501                 printf(" ");
 502                 utf_display_printable_ascii(fr->descriptor);
 503         }
 504 }
 505 #endif
 506
 507 /* field_fieldref_println ******************************************************
 508
 509    (debugging only)
 510
 511 *******************************************************************************/
 512
 513 #if !defined(NDEBUG)
 514 void field_fieldref_println(constant_FMIref *fr)
 515 {
 516         field_fieldref_print(fr);
 517         printf("\n");
 518 }
 519 #endif
 520
 521 /*
 522  * These are local overrides for various environment variables in Emacs.
 523  * Please do not remove this and leave it at the end of the file, where
 524  * Emacs will automagically detect them.
 525  * ---------------------------------------------------------------------
 526  * Local variables:
 527  * mode: c
 528  * indent-tabs-mode: t
 529  * c-basic-offset: 4
 530  * tab-width: 4
 531  * End:
 532  */