rom/oop/hiddmetaclass.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: OOP HIDD metaclass
   6     Lang: english
   7 */
   8
   9 #include <string.h>
  10
  11 #include <proto/exec.h>
  12 #include <proto/utility.h>
  13 #include <exec/memory.h>
  14
  15 #include <proto/oop.h>
  16
  17 #include "intern.h"
  18
  19 #undef SDEBUG
  20 #undef DEBUG
  21 #define SDEBUG 0
  22 #define DEBUG 0
  23 #include <aros/debug.h>
  24
  25 #define UB(x) ((UBYTE *)x)
  26
  27 #define MD(cl) ((struct metadata *)cl)
  28
  29 #define IntCallMethod(cl, o, msg)                                       \
  30 {                                                                       \
  31     register struct IFMethod *ifm;                                      \
  32     D(bug("mid=%ld\n", *msg)); ifm = &((struct hiddmeta_inst *)cl)->data.methodtable[*msg];     \
  33     D(bug("ifm: func %p, cl %p\n", ifm->MethodFunc, ifm->mClass)); return (ifm->MethodFunc(ifm->mClass, o, msg));                       \
  34 }
  35
  36
  37 static VOID get_info_on_ifs(OOP_Class *super
  38                         ,struct OOP_InterfaceDescr *ifdescr
  39                         ,ULONG  *total_num_methods_ptr
  40                         ,ULONG  *total_num_ifs_ptr
  41                         ,struct IntOOPBase *OOPBase);
  42
  43 static IPTR HIDD_DoMethod(OOP_Object *o, OOP_Msg msg);
  44 static IPTR HIDD_CoerceMethod(OOP_Class *cl, OOP_Object *o, OOP_Msg msg);
  45 static IPTR HIDD_DoSuperMethod(OOP_Class *cl, OOP_Object *o, OOP_Msg msg);
  46 static inline ULONG get_max_midx(struct OOP_MethodDescr *md);
  47
  48 /*
  49    The metaclass is used to create class. That means,
  50    classes are instances of the meta class.
  51    The meta class is itself both a class (you can
  52    create instances of it), and an object (you can invoke
  53    methods on it.
  54 */
  55
  56 struct hiddmeta_inst
  57 {
  58     struct metadata base;
  59     struct hiddmeta_data
  60     {
  61         struct if_info
  62         {
  63             /* The globally unique ID of the interface */
  64             STRPTR interface_id;
  65             ULONG num_methods;
  66             ULONG mtab_offset;
  67
  68         } *ifinfo;
  69         struct IFMethod *methodtable;
  70     } data;
  71 };
  72
  73 #define OOPBase ((struct IntOOPBase *)cl->OOPBasePtr)
  74
  75 /**********************
  76 **  HIDDMeta::New()  **
  77 **********************/
  78 static OOP_Object *hiddmeta_new(OOP_Class *cl, OOP_Object *o, struct pRoot_New *msg)
  79 {
  80
  81     IPTR (*domethod)(OOP_Object *, OOP_Msg)                     = NULL;
  82     IPTR (*coercemethod)(OOP_Class *, OOP_Object *, OOP_Msg)    = NULL;
  83     IPTR (*dosupermethod)(OOP_Class *, OOP_Object *, OOP_Msg)   = NULL;
  84
  85
  86     EnterFunc(bug("HIDDMeta::New(cl=%s, msg = %p)\n",
  87         cl->ClassNode.ln_Name, msg));
  88
  89     /* Analyze the taglist before object is allocated,
  90     ** so we can easily exit cleanly if some info is missing
  91     */
  92
  93     domethod      = (IPTR (*)())GetTagData(aMeta_DoMethod,      0, msg->attrList);
  94     coercemethod  = (IPTR (*)())GetTagData(aMeta_CoerceMethod,  0, msg->attrList);
  95     dosupermethod = (IPTR (*)())GetTagData(aMeta_DoSuperMethod, 0, msg->attrList);
  96
  97
  98     /* We are sure we have enough args, and can let rootclass alloc the instance data */
  99     o = (OOP_Object *)OOP_DoSuperMethod((OOP_Class *)cl, o, (OOP_Msg)msg);
 100     if (o)
 101     {
 102
 103         D(bug("Instance allocated\n"));
 104
 105
 106         /* Initialize class fields */
 107
 108         if (!domethod)
 109             domethod = HIDD_DoMethod;
 110
 111         if (!coercemethod)
 112             coercemethod = HIDD_CoerceMethod;
 113
 114         if (!dosupermethod)
 115         {
 116
 117             /* Use superclass' DoSupermethod call if superclass isn't
 118                an instance of the HIDDMetaClass
 119             */
 120             if (OOP_OCLASS(MD(o)->superclass) != (OOP_Class *)cl)
 121                 dosupermethod = MD(o)->superclass->cl_DoSuperMethod;
 122             else
 123                 dosupermethod = HIDD_DoSuperMethod;
 124         }
 125
 126         ((OOP_Class *)o)->cl_DoMethod   = domethod;
 127         ((OOP_Class *)o)->cl_CoerceMethod       = coercemethod;
 128         ((OOP_Class *)o)->cl_DoSuperMethod      = dosupermethod;
 129
 130     }
 131
 132     ReturnPtr ("HIDDMeta::New", OOP_Object *, o);
 133 }
 134
 135 /********************************
 136 **  HIDDMeta::allocdisptabs()  **
 137 ********************************/
 138 static BOOL hiddmeta_allocdisptabs(OOP_Class *cl, OOP_Object *o, struct P_meta_allocdisptabs *msg)
 139 {
 140     ULONG disptab_size, total_num_methods = 0UL, total_num_ifs = 0UL;
 141
 142     struct hiddmeta_data *data = OOP_INST_DATA(cl, o);
 143     struct IFMethod *mtab = NULL;
 144
 145     EnterFunc(bug("HIDDMeta::allocdisptabs(cl=%p, ifDescr=%p)\n", cl, msg->ifdescr));
 146
 147     /* Find the total number of methods in the superclass */
 148     get_info_on_ifs(msg->superclass
 149                                 ,msg->ifdescr
 150                                 ,&total_num_methods
 151                                 ,&total_num_ifs
 152                                 ,(struct IntOOPBase *)OOPBase);
 153
 154     /* Set number of interfaces */
 155     MD(o)->numinterfaces = total_num_ifs;
 156
 157     D(bug("Number of  interfaces: %ld, methods %ld\n",
 158         total_num_ifs, total_num_methods));
 159
 160     /* Allocate the dispatch table */
 161     disptab_size = UB(&mtab[total_num_methods]) - UB(&mtab[0]);
 162
 163     data->methodtable = AllocVec(disptab_size, MEMF_ANY|MEMF_CLEAR);
 164     if (data->methodtable)
 165     {
 166         struct if_info *ifinfo = NULL;
 167         ULONG ifinfo_size;
 168
 169         mtab = data->methodtable;
 170
 171         /* Allocate memory for interface info table */
 172         ifinfo_size = UB(&ifinfo[total_num_ifs]) - UB(&ifinfo[0]);
 173         data->ifinfo = AllocVec(ifinfo_size, MEMF_ANY|MEMF_CLEAR);
 174         if (data->ifinfo)
 175         {
 176             /* Iterate through all parent interfaces, copying relevant info
 177                into our own dispatch tables.
 178             */
 179             STRPTR interface_id;
 180             ULONG num_methods;
 181             IPTR iterval = 0UL;
 182             struct IFMethod *ifm;
 183             ULONG mtab_offset = 0;
 184             struct OOP_InterfaceDescr *ifdescr = msg->ifdescr;
 185
 186             ifinfo = data->ifinfo;
 187
 188             while ((ifm = meta_iterateifs((OOP_Object *)msg->superclass, &iterval, &interface_id, &num_methods)))
 189             {
 190                 ULONG copy_size;
 191                 struct OOP_InterfaceDescr *ifd;
 192
 193                 /* Copy interface into dispatch tables */
 194                 copy_size = UB(&mtab[num_methods]) - UB(&mtab[0]);
 195
 196                 D(bug("Copying mtab (%p to %p) , size: %ld\n", ifm, mtab, copy_size));
 197                 CopyMem(ifm, mtab, copy_size);
 198
 199                 D(bug("mtab copied, mtab=%p\n", mtab));
 200                 /* store interface info */
 201
 202                 /* allready copied by superclass, no need to recopy it */
 203                 ifinfo->interface_id    = interface_id;
 204                 D(bug("interfaceID for ifinfo %p set to %s\n", ifinfo, ifinfo->interface_id));
 205
 206                 /* See if this class supplies more methods for the interace */
 207                 for (ifd = msg->ifdescr; ifd->MethodTable != 0; ifd ++)
 208                 {
 209                     if (0 == strcmp(ifd->InterfaceID, interface_id))
 210                     {
 211                         ULONG max_midx;
 212
 213                         max_midx = get_max_midx(ifd->MethodTable);
 214                         if (max_midx >= num_methods)
 215                                 num_methods = max_midx + 1;
 216                     }
 217                 }
 218                 ifinfo->num_methods     = num_methods;
 219                 D(bug("numemthods set to %ld\n", num_methods));
 220                 ifinfo->mtab_offset     = mtab_offset;
 221                 D(bug("mtab_offset set to %ld\n", mtab_offset));
 222
 223                 mtab_offset += num_methods;
 224                 mtab += num_methods;
 225             {
 226                 ULONG idx;
 227                 D(bug("\n"));
 228                 for (idx = 0; idx < total_num_ifs; idx ++)
 229                 {
 230                     D(bug("ifinfo: (%p, %s), idx: %ld\n"
 231                         ,&(data->ifinfo[idx])
 232                         ,data->ifinfo[idx].interface_id
 233                         ,idx ));
 234
 235                 }
 236                 D(bug("\n"));
 237             }
 238
 239                 ifinfo ++;
 240             }
 241
 242             D(bug("Finished copying super IFs\n\n"));
 243
 244             {
 245                 ULONG idx;
 246                 for (idx = 0; idx < total_num_ifs; idx ++)
 247                 {
 248                     D(bug(" ifinfo: (%p, %s), idx: %ld\n"
 249                         ,&(data->ifinfo[idx])
 250                         ,data->ifinfo[idx].interface_id
 251                         ,idx ));
 252
 253                 }
 254             }
 255
 256
 257
 258             /* Now find the interface (max one) that is new for this class,
 259                and at the same time override all methods for all interfaces
 260             */
 261
 262             D(bug("Find new interface\n"));
 263             for (; ifdescr->MethodTable != NULL; ifdescr ++)
 264             {
 265                 struct OOP_MethodDescr *mdescr;
 266                 ULONG current_idx;
 267
 268                 ifm = meta_getifinfo((OOP_Object *)msg->superclass, ifdescr->InterfaceID, &num_methods);
 269                 if (!ifm)
 270                 {
 271                     ULONG mbase = 0UL;
 272
 273                     D(bug("Found new interface %s\n", ifdescr->InterfaceID));
 274                     /* Interface is new to this class */
 275
 276
 277                     /* Do NOT copy interfaceID */
 278                     ifinfo->interface_id = ifdescr->InterfaceID;
 279                     ifinfo->num_methods  = get_max_midx(ifdescr->MethodTable) + 1;
 280                     ifinfo->mtab_offset  = mtab_offset;
 281
 282                     /* Install methodbase for this interface */
 283                     if (!init_methodbase( ifdescr->InterfaceID
 284                                          ,mtab_offset
 285                                          ,&mbase
 286                                          ,(struct IntOOPBase *)OOPBase))
 287                     {
 288                         goto init_err;
 289                     }
 290
 291
 292
 293                     /* The below is not necessary, since we never have more than one
 294                        new interface
 295
 296                     ifinfo ++;
 297                     mtab_offset += ifdescr->NumMethods;
 298                     mtab = &mtab[mtab_offset];
 299
 300                     */
 301                 }
 302
 303                 /* Find the index into the ifinfo table for the current entry */
 304                 D(bug("Finding current idx\n"));
 305                 for (current_idx = 0; ; current_idx ++)
 306                 {
 307                     D(bug("ifdecr: %s, ifinfo: (%p, %s), idx: %ld\n", ifdescr->InterfaceID, &(data->ifinfo[current_idx]), data->ifinfo[current_idx].interface_id, current_idx ));
 308
 309                     if (!strcmp(ifdescr->InterfaceID, data->ifinfo[current_idx].interface_id))
 310                         break;
 311                 }
 312
 313                 D(bug("Overriding methods\n"));
 314
 315
 316                 for (mdescr = ifdescr->MethodTable; mdescr->MethodFunc != NULL; mdescr ++)
 317                 {
 318                     ULONG mtab_idx;
 319
 320                     mtab_idx = mdescr->MethodIdx + data->ifinfo[current_idx].mtab_offset;
 321                     D(bug("Initing of if %s methods at %ld\n", ifdescr->InterfaceID, mtab_idx));
 322
 323                     data->methodtable[mtab_idx].MethodFunc = mdescr->MethodFunc;
 324                     data->methodtable[mtab_idx].mClass = (OOP_Class *)o;
 325
 326                 } /* for (each method in current interface) */
 327
 328
 329             } /* for (each interface in this class' interface description) */
 330
 331             ReturnBool("HIIDMeta::allocdisptabs", TRUE);
 332 init_err:
 333             FreeVec(data->ifinfo);
 334
 335         } /* if (interface info table allocated) */
 336
 337         FreeVec(data->methodtable);
 338
 339     } /* if (methodtable allocated) */
 340
 341     ReturnBool("HIDDMeta::allocdisptabs", FALSE);
 342 }
 343
 344 /*******************************
 345 **  HIDDMeta::freedisptabs()  **
 346 ********************************/
 347 static VOID hiddmeta_freedisptabs(OOP_Class *cl, OOP_Object *o, OOP_Msg msg)
 348 {
 349     struct hiddmeta_inst *inst = (struct hiddmeta_inst *)o;
 350
 351     FreeVec(inst->data.methodtable);
 352     FreeVec(inst->data.ifinfo);
 353     return;
 354 }
 355
 356
 357
 358 /*****************************
 359 **  HIDDMeta::iterateifs()  **
 360 *****************************/
 361 static struct IFMethod *hiddmeta_iterateifs(OOP_Class *cl, OOP_Object *o, struct P_meta_iterateifs *msg)
 362 {
 363     struct hiddmeta_inst *inst = (struct hiddmeta_inst *)o;
 364     ULONG idx = *msg->iterval_ptr;
 365     struct IFMethod *mtab;
 366
 367     EnterFunc(bug("HIDDMeta::iterateifs(cl=%p, o=%p, iterval=%p)\n",
 368         cl, o, *msg->iterval_ptr));
 369     if (idx >= inst->base.numinterfaces)
 370         mtab = NULL;
 371     else
 372     {
 373         /* First iteration */
 374         struct if_info *ifinfo;
 375         ifinfo = &(inst->data.ifinfo[idx]);
 376
 377         *msg->interface_id_ptr  = ifinfo->interface_id;
 378         *msg->num_methods_ptr   = ifinfo->num_methods;
 379
 380         mtab = &(inst->data.methodtable[ifinfo->mtab_offset]);
 381
 382         (*msg->iterval_ptr) ++;
 383
 384     }
 385     ReturnPtr("HIDDMeta::iterateifs", struct IFMethod *, mtab);
 386 }
 387
 388 /****************************
 389 **  HIDDMeta::getifinfo()  **
 390 ****************************/
 391 static struct IFMethod *hiddmeta_getifinfo(OOP_Class *cl, OOP_Object *o, struct P_meta_getifinfo *msg)
 392 {
 393
 394     struct hiddmeta_inst *inst = (struct hiddmeta_inst *)o;
 395     ULONG current_idx;
 396     struct IFMethod *mtab = NULL;
 397
 398     EnterFunc(bug("HIDDMeta::getifinfo(cl=%p, o=%p, ifID=%s)\n",
 399         cl, o, msg->interface_id));
 400
 401     /* Look up the interface */
 402
 403     for (current_idx = 0; current_idx < inst->base.numinterfaces; current_idx ++)
 404     {
 405         struct if_info *ifinfo;
 406
 407         ifinfo = &(inst->data.ifinfo[current_idx]);
 408         if (!strcmp(msg->interface_id, ifinfo->interface_id))
 409         {
 410             *(msg->num_methods_ptr) = ifinfo->num_methods;
 411             mtab = &(inst->data.methodtable[ifinfo->mtab_offset]);
 412             break;
 413         }
 414     }
 415     ReturnPtr("HIDDMeta::getifinfo", struct IFMethod *, mtab);
 416 }
 417
 418
 419 /*****************************
 420 **  HIDDMeta::findmethod()  **
 421 *****************************/
 422 struct IFMethod *hiddmeta_findmethod(OOP_Class *cl, OOP_Object *o, struct P_meta_findmethod *msg)
 423 {
 424     struct hiddmeta_inst *inst = (struct hiddmeta_inst *)o;
 425     struct IFMethod *m;
 426
 427     EnterFunc(bug("HIDDMeta::findmethod(cl=%p, o=%p, mID=%ld)\n",
 428         cl, o, msg->method_to_find));
 429
 430     m = &(inst->data.methodtable[msg->method_to_find]);
 431
 432
 433     ReturnPtr("HIDDMeta::findmethod", struct IFMethod *, m);
 434
 435 }
 436
 437 #undef OOPBase
 438
 439 #define NUM_ROOT_METHODS 1
 440 #define NUM_META_METHODS 5
 441
 442 /************************
 443 **  Support functions  **
 444 ************************/
 445 OOP_Class *init_hiddmetaclass(struct IntOOPBase *OOPBase)
 446 {
 447     struct OOP_MethodDescr root_mdescr[NUM_ROOT_METHODS + 1] =
 448     {
 449         { (IPTR (*)())hiddmeta_new,             moRoot_New              },
 450         {  NULL, 0UL }
 451     };
 452
 453     struct OOP_MethodDescr meta_mdescr[NUM_META_METHODS + 1] =
 454     {
 455         { (IPTR (*)())hiddmeta_allocdisptabs,   MO_meta_allocdisptabs   },
 456         { (IPTR (*)())hiddmeta_freedisptabs,    MO_meta_freedisptabs    },
 457         { (IPTR (*)())hiddmeta_getifinfo,       MO_meta_getifinfo       },
 458         { (IPTR (*)())hiddmeta_iterateifs,      MO_meta_iterateifs      },
 459         { (IPTR (*)())hiddmeta_findmethod,      MO_meta_findmethod      },
 460         {  NULL, 0UL }
 461     };
 462
 463
 464     struct OOP_InterfaceDescr ifdescr[] =
 465     {
 466         {root_mdescr, IID_Root, NUM_ROOT_METHODS},
 467         {meta_mdescr, IID_Meta, NUM_META_METHODS},
 468         {NULL, NULL, 0UL}
 469     };
 470
 471     struct TagItem tags[] =
 472     {
 473         {aMeta_SuperPtr,                (IPTR)BASEMETAPTR},
 474         {aMeta_InterfaceDescr,          (IPTR)ifdescr},
 475         {aMeta_ID,                      (IPTR)CLID_SIMeta},
 476         {aMeta_InstSize,                (IPTR)sizeof (struct hiddmeta_data) },
 477         {TAG_DONE, 0UL}
 478     };
 479
 480     OOP_Class *cl;
 481     EnterFunc(bug("init_hiddmetaclass()\n"));
 482
 483     cl = (OOP_Class *)OOP_NewObject(NULL, CLID_MIMeta, tags);
 484     if (cl)
 485     {
 486         cl->UserData = OOPBase;
 487         OOP_AddClass(cl);
 488     }
 489     D(bug("HIDD_CoerceMethod=%p\n", HIDD_CoerceMethod));
 490
 491     ReturnPtr ("init_hiddmetaclass()", OOP_Class *, cl);
 492
 493 }
 494
 495 static inline ULONG get_max_midx(struct OOP_MethodDescr *md)
 496 {
 497
 498     ULONG max_midx = 0;
 499
 500
 501     for (; md->MethodFunc != NULL; md ++)
 502     {
 503         if (md->MethodIdx > max_midx)
 504         {
 505             max_midx = md->MethodIdx;
 506         }
 507     }
 508     return max_midx;
 509 }
 510
 511 /************************
 512 **  get_info_on_ifs()  **
 513 ************************/
 514 static VOID get_info_on_ifs(OOP_Class *super
 515                         ,struct OOP_InterfaceDescr *ifdescr
 516                         ,ULONG *total_num_methods_ptr
 517                         ,ULONG *total_num_ifs_ptr
 518                         ,struct IntOOPBase *OOPBase)
 519 {
 520     ULONG num_methods;
 521     STRPTR interface_id;
 522     IPTR iterval = 0UL;
 523     EnterFunc(bug("get_info_on_ifs(super=%s, ifdescr=%p, OOPBase=%p\n",
 524         super->ClassNode.ln_Name, ifdescr, OOPBase));
 525
 526     *total_num_methods_ptr = 0UL;
 527     *total_num_ifs_ptr = 0UL;
 528
 529     /* Iterate all parent interfaces, counting methods and interfaces */
 530     while (meta_iterateifs((OOP_Object *)super, &iterval, &interface_id, &num_methods))
 531     {
 532         struct OOP_InterfaceDescr *ifd;
 533         D(bug("if %s has %ld methods\n", interface_id, num_methods));
 534         /* Check whether current class also supplies methods for this interface */
 535
 536         for (ifd = ifdescr; ifd->MethodTable != NULL; ifd ++)
 537         {
 538             if (0 == strcmp(ifd->InterfaceID, interface_id))
 539             {
 540                 /* Interface also supplied here */
 541                 ULONG max_midx;
 542
 543                 max_midx = get_max_midx(ifd->MethodTable);
 544                 if (max_midx >= num_methods)
 545                         num_methods = max_midx + 1;
 546
 547             }
 548         }
 549         *total_num_methods_ptr += num_methods;
 550         (*total_num_ifs_ptr) ++;
 551     }
 552     D(bug("Finished counting methods\n"));
 553
 554     /* Go through all interface descrs for this class, and find evt. new ones */
 555     for (; ifdescr->MethodTable != NULL; ifdescr ++)
 556     {
 557         if (!meta_getifinfo((OOP_Object *)super, ifdescr->InterfaceID, &num_methods))
 558         {
 559             /* The interface is new for this class.
 560                For HIDDMeta class max. one interface can be new for a class
 561             */
 562             ULONG max_midx = 0;
 563             max_midx = get_max_midx(ifdescr->MethodTable);
 564
 565             /* Get the largest method idx */
 566
 567             (*total_num_methods_ptr) += (max_midx + 1);
 568             (*total_num_ifs_ptr) ++;
 569         }
 570     }
 571
 572     ReturnVoid("get_info_on_ifs");
 573 }
 574
 575 #define OOPBase (cl->OOPBasePtr)
 576
 577 /**********************
 578 **  HIDD_DoMethod()  **
 579 **********************/
 580 static IPTR HIDD_DoMethod(OOP_Object *o, OOP_Msg msg)
 581 {
 582     register struct hiddmeta_inst *cl = (struct hiddmeta_inst *)OOP_OCLASS(o);
 583     D(bug("HIDD_DoMethod(o=%p. msg=%p)\n", o, msg));
 584
 585     IntCallMethod(cl, o, msg);
 586
 587 }
 588
 589 /************************
 590 **  HIDD_CoerceMethod  **
 591 ************************/
 592 static IPTR HIDD_CoerceMethod(OOP_Class *cl, OOP_Object *o, OOP_Msg msg)
 593 {
 594     register struct IFMethod *ifm;
 595     D(bug("HIDD_CoerceMethod()\n"));
 596     D(bug("cl=%s, mid=%ld\n", cl->ClassNode.ln_Name, *msg)); ifm = &((struct hiddmeta_inst *)cl)->data.methodtable[*msg];
 597     D(bug("ifm %p func %p, cl %p\n", ifm, ifm->MethodFunc, ifm->mClass)); return (ifm->MethodFunc(ifm->mClass, o, msg));
 598 }
 599
 600 /************************
 601 **  HIDD_DoSuperMethod  **
 602 ************************/
 603 static IPTR HIDD_DoSuperMethod(OOP_Class *cl, OOP_Object *o, OOP_Msg msg)
 604 {
 605     D(bug("HIDD_DoSuperMethod()\n"));
 606     cl = MD(cl)->superclass;
 607     IntCallMethod(cl, o, msg);
 608 }