librune/type.c

   1 /*
   2  * TYPE.C
   3  *
   4  * (c)Copyright 1993-2014, Matthew Dillon, All Rights Reserved.  See the
   5  *    COPYRIGHT file at the base of the distribution.
   6  */
   7
   8 #include "defs.h"
   9
  10 Type DynamicLValueType;
  11 Type DynamicRValueType;
  12
  13 Type NumericType;       /* generic numeric placeholder */
  14 Type IntegralType;      /* generic integral placeholder */
  15 Type SIntegerType;      /* generic signed integer placeholder */
  16 Type UIntegerType;      /* generic unsigned integer placeholder */
  17
  18 Type VoidType;
  19 Type BoolType;
  20 Type Int8Type;
  21 Type UInt8Type;
  22 Type Int16Type;
  23 Type UInt16Type;
  24 Type Int32Type;
  25 Type UInt32Type;
  26 Type Int64Type;
  27 Type UInt64Type;
  28 Type Int128Type;
  29 Type UInt128Type;
  30
  31 Type IntPtrType;
  32 Type UIntPtrType;
  33 Type OffType;
  34 Type SizeType;
  35
  36 Type FloatType;         /* generic float placeholder */
  37 Type Float32Type;
  38 Type Float64Type;
  39 Type Float128Type;
  40
  41 Type PointerType;       /* generic pointer placeholder */
  42 Type CCharType;         /* const char           */
  43 Type StrType;           /* const char *         */
  44 Type CharPtrType;       /* char *               */
  45 Type CharPtrPtrType;    /* char **              */
  46 Type VoidPtrType;       /* void *               */
  47 Type VoidRefType;       /* void @               */
  48 Type CVoidPtrType;      /* const void *         */
  49 Type LVoidPtrType;      /* lvalue void *        */
  50
  51 Type LexRefType;        /* run-time access class tie-ins */
  52 Type ScopeType;
  53 Type DeclarationType;
  54 Type SemGroupType;
  55 Type TypeType;
  56 Type FILLERTypeType;
  57 Type FILLERDeclType;
  58
  59 typelist_t DynamicTypeList = RUNE_HEAD_INITIALIZER(DynamicTypeList);
  60 typelist_t CompoundTypeList = RUNE_HEAD_INITIALIZER(CompoundTypeList);
  61 typelist_t ArgsTypeList = RUNE_HEAD_INITIALIZER(ArgsTypeList);
  62 typelist_t StorageTypeList = RUNE_HEAD_INITIALIZER(StorageTypeList);
  63
  64 static void initInternalClassType(Type *type, Declaration *d);
  65
  66 Type *BaseTypeAry[] = {
  67                 &DynamicLValueType, &DynamicRValueType, &NumericType,
  68                 &IntegralType, &SIntegerType, &UIntegerType,
  69                 &VoidType, &BoolType, &Int8Type, &UInt8Type,
  70                 &Int16Type, &UInt16Type, &Int32Type, &UInt32Type,
  71                 &Int64Type, &UInt64Type, &Int128Type, &UInt128Type,
  72
  73                 &IntPtrType, &UIntPtrType, &OffType, &SizeType,
  74
  75                 &FloatType, &Float32Type, &Float64Type, &Float128Type,
  76
  77                 &PointerType, &CCharType, &StrType, &CharPtrType,
  78                 &CharPtrPtrType, &VoidPtrType, &VoidRefType, &CVoidPtrType,
  79                 &LVoidPtrType,
  80
  81                 &LexRefType, &ScopeType, &DeclarationType, &SemGroupType,
  82                 &TypeType, &FILLERTypeType, &FILLERDeclType,
  83                 NULL
  84 };
  85
  86 void
  87 initType(Type *type, typelist_t *list, int op)
  88 {
  89         type->ty_Op = op;
  90         RUNE_INIT(&type->ty_QList);
  91         if (list)
  92                 RUNE_INSERT_TAIL(list, type, ty_Node);
  93         type->ty_SQList = list;
  94 }
  95
  96 void
  97 initQualType(Type *type, typelist_t *list, int op, int sqflags)
  98 {
  99         initType(type, list, op);
 100         type->ty_SQFlags = sqflags;
 101 }
 102
 103 void
 104 initPtrType(Type *type, Type *ptrto, int sqflags)
 105 {
 106         initQualType(type, &ptrto->ty_QList, TY_PTRTO, sqflags);
 107         type->ty_PtrType.et_Type = ptrto;
 108         /*type->ty_Bytes = sizeof(PointerStor);*/
 109         type->ty_AlignMask = sizeof(void *) - 1;
 110 }
 111
 112 void
 113 initCPtrType(Type *type, Type *ptrto, int sqflags)
 114 {
 115         initQualType(type, &ptrto->ty_QList, TY_CPTRTO, sqflags);
 116         type->ty_PtrType.et_Type = ptrto;
 117         /*type->ty_Bytes = sizeof(void *);*/
 118         type->ty_AlignMask = sizeof(void *) - 1;
 119 }
 120
 121 static void
 122 initRefType(Type *type, Type *refto, int sqflags)
 123 {
 124         initQualType(type, &refto->ty_QList, TY_REFTO, sqflags);
 125         type->ty_RefType.et_Type = refto;
 126         type->ty_AlignMask = sizeof(void *) - 1;
 127         /*type->ty_Bytes = sizeof(PointerStor);*/
 128 }
 129
 130 void
 131 TypeInit(void)
 132 {
 133         int i;
 134
 135         initQualType(&DynamicLValueType, &DynamicTypeList,
 136                      TY_DYNAMIC, SF_LVALUE);
 137         initType(&DynamicRValueType, &DynamicTypeList, TY_DYNAMIC);
 138         initType(&NumericType, NULL, TY_UNRESOLVED);
 139         initType(&IntegralType, NULL, TY_UNRESOLVED);
 140         initType(&SIntegerType, NULL, TY_UNRESOLVED);
 141         initType(&UIntegerType, NULL, TY_UNRESOLVED);
 142         initType(&FloatType, NULL, TY_UNRESOLVED);
 143         initType(&PointerType, NULL, TY_UNRESOLVED);
 144         PointerType.ty_AlignMask = sizeof(void *) - 1;
 145
 146         initType(&VoidType, NULL, TY_UNRESOLVED);
 147         initType(&BoolType, NULL, TY_UNRESOLVED);
 148         initType(&Int8Type, NULL, TY_UNRESOLVED);
 149         initType(&UInt8Type, NULL, TY_UNRESOLVED);
 150         initType(&Int16Type, NULL, TY_UNRESOLVED);
 151         initType(&UInt16Type, NULL, TY_UNRESOLVED);
 152         initType(&Int32Type, NULL, TY_UNRESOLVED);
 153         initType(&UInt32Type, NULL, TY_UNRESOLVED);
 154         initType(&Int64Type, NULL, TY_UNRESOLVED);
 155         initType(&UInt64Type, NULL, TY_UNRESOLVED);
 156
 157         initType(&IntPtrType, NULL, TY_UNRESOLVED);
 158         initType(&UIntPtrType, NULL, TY_UNRESOLVED);
 159         initType(&OffType, NULL, TY_UNRESOLVED);
 160         initType(&SizeType, NULL, TY_UNRESOLVED);
 161
 162         initType(&Float32Type, NULL, TY_UNRESOLVED);
 163         initType(&Float64Type, NULL, TY_UNRESOLVED);
 164         initType(&Float128Type, NULL, TY_UNRESOLVED);
 165
 166         initQualType(&CCharType, NULL, TY_UNRESOLVED, SF_CONST);
 167         initPtrType(&StrType, &CCharType, 0);
 168         initPtrType(&CharPtrType, &UInt8Type, 0);
 169         initPtrType(&CharPtrPtrType, &CharPtrType, 0);
 170         initPtrType(&VoidPtrType, &VoidType, 0);
 171         initRefType(&VoidRefType, &VoidType, 0);
 172         initCPtrType(&CVoidPtrType, &VoidType, SF_CONST);
 173         initPtrType(&LVoidPtrType, &VoidType, SF_LVALUE);
 174
 175         /*
 176          * Mark internal types (not all are bound to classes so it is
 177          * easiest to just do it here).  This will prevent the collapse
 178          * code from trying to collapse our base types.
 179          */
 180         for (i = 0; BaseTypeAry[i]; ++i)
 181                 BaseTypeAry[i]->ty_Flags |= TF_ISINTERNAL;
 182
 183         StrTableAlloc("void", 4, SPECIAL_INTERNAL_VOID);
 184         StrTableAlloc("bool", 4, SPECIAL_INTERNAL_BOOL);
 185         StrTableAlloc("int8_t", 6, SPECIAL_INTERNAL_INT8);
 186         StrTableAlloc("uint8_t", 7, SPECIAL_INTERNAL_UINT8);
 187         StrTableAlloc("int16_t", 7, SPECIAL_INTERNAL_INT16);
 188         StrTableAlloc("uint16_t", 8, SPECIAL_INTERNAL_UINT16);
 189         StrTableAlloc("int32_t", 7, SPECIAL_INTERNAL_INT32);
 190         StrTableAlloc("uint32_t", 8, SPECIAL_INTERNAL_UINT32);
 191         StrTableAlloc("int64_t", 7, SPECIAL_INTERNAL_INT64);
 192         StrTableAlloc("uint64_t", 8, SPECIAL_INTERNAL_UINT64);
 193         StrTableAlloc("int128_t", 8, SPECIAL_INTERNAL_INT128);
 194         StrTableAlloc("uint128_t", 9, SPECIAL_INTERNAL_UINT128);
 195
 196         StrTableAlloc("float32_t", 9, SPECIAL_INTERNAL_FLOAT32);
 197         StrTableAlloc("float64_t", 9, SPECIAL_INTERNAL_FLOAT64);
 198         StrTableAlloc("float128_t", 10, SPECIAL_INTERNAL_FLOAT128);
 199
 200         StrTableAlloc("intptr_t", 8, SPECIAL_INTERNAL_INTPTR);
 201         StrTableAlloc("uintptr_t", 9, SPECIAL_INTERNAL_UINTPTR);
 202         StrTableAlloc("size_t", 6, SPECIAL_INTERNAL_SIZE);
 203         StrTableAlloc("off_t", 5, SPECIAL_INTERNAL_OFF);
 204
 205         StrTableAlloc("Float", 5, SPECIAL_INTERNAL_FLOAT);
 206         StrTableAlloc("Pointer", 7, SPECIAL_INTERNAL_POINTER);
 207         StrTableAlloc("Numeric", 7, SPECIAL_INTERNAL_NUMERIC);
 208         StrTableAlloc("Integral", 8, SPECIAL_INTERNAL_INTEGRAL);
 209         StrTableAlloc("SInteger", 8, SPECIAL_INTERNAL_SINTEGER);
 210         StrTableAlloc("UInteger", 8, SPECIAL_INTERNAL_UINTEGER);
 211
 212         StrTableAlloc("LexRef", 6, SPECIAL_INTERNAL_LEXREF);
 213         StrTableAlloc("Scope", 5, SPECIAL_INTERNAL_SCOPE);
 214         StrTableAlloc("Declaration", 11, SPECIAL_INTERNAL_DECLARATION);
 215         StrTableAlloc("SemGroup", 8, SPECIAL_INTERNAL_SEMGROUP);
 216         StrTableAlloc("Type", 4, SPECIAL_INTERNAL_TYPE);
 217         StrTableAlloc("FILLERType", 10, SPECIAL_INTERNAL_FILLERTYPE);
 218         StrTableAlloc("FILLERDecl", 10, SPECIAL_INTERNAL_FILLERDECL);
 219
 220         StrTableAlloc("__count",        7,      SPECIAL_COUNT);
 221         StrTableAlloc("__data",         6,      SPECIAL_DATA);
 222         StrTableAlloc("__varcount",     10,     SPECIAL_VAR_COUNT);
 223         StrTableAlloc("__vardata",      9,      SPECIAL_VAR_DATA);
 224         StrTableAlloc("__typeid",       8,      SPECIAL_TYPEID);
 225         StrTableAlloc("__typestr",      9,      SPECIAL_TYPESTR);
 226         StrTableAlloc("NULL",           4,      SPECIAL_NULL);
 227 }
 228
 229 /*
 230  * Attach an internal class, creating a global summary type for it that
 231  * allows our interpreter and code generator to make various assumptions.
 232  */
 233 int
 234 InternalClassAttach(Parse *p __unused, int t, Declaration *d)
 235 {
 236         Type *itype = NULL;
 237         int s;
 238
 239         dassert_decl(d, d->d_Op == DOP_CLASS);
 240
 241         if ((s = StrTableSpecial(d->d_Id)) & SPECIALF_INTERNAL) {
 242                 switch(s) {
 243                 case SPECIAL_INTERNAL_VOID:
 244                         itype = &VoidType;
 245                         break;
 246                 case SPECIAL_INTERNAL_BOOL:
 247                         /*
 248                          * Special flag helper (resolver sets TF_ISBOOL in
 249                          * in the type)
 250                          */
 251                         itype = &BoolType;
 252                         d->d_ClassDecl.ed_SemGroup->sg_Flags |= SGF_ISBOOL;
 253                         break;
 254                 case SPECIAL_INTERNAL_INT8:
 255                         itype = &Int8Type;
 256                         break;
 257                 case SPECIAL_INTERNAL_UINT8:
 258                         itype = &UInt8Type;
 259                         break;
 260                 case SPECIAL_INTERNAL_INT16:
 261                         itype = &Int16Type;
 262                         break;
 263                 case SPECIAL_INTERNAL_UINT16:
 264                         itype = &UInt16Type;
 265                         break;
 266                 case SPECIAL_INTERNAL_INT32:
 267                         itype = &Int32Type;
 268                         break;
 269                 case SPECIAL_INTERNAL_UINT32:
 270                         itype = &UInt32Type;
 271                         break;
 272                 case SPECIAL_INTERNAL_INT64:
 273                         itype = &Int64Type;
 274                         break;
 275                 case SPECIAL_INTERNAL_UINT64:
 276                         itype = &UInt64Type;
 277                         break;
 278                 case SPECIAL_INTERNAL_INT128:
 279                         itype = &Int128Type;
 280                         break;
 281                 case SPECIAL_INTERNAL_UINT128:
 282                         itype = &UInt128Type;
 283                         break;
 284
 285                 case SPECIAL_INTERNAL_FLOAT:
 286                         /*
 287                          * Special flag helper (resolver sets TF_ISFLOATING in
 288                          * in the type)
 289                          */
 290                         itype = &FloatType;
 291                         d->d_ClassDecl.ed_SemGroup->sg_Flags |= SGF_ISFLOATING;
 292                         break;
 293                 case SPECIAL_INTERNAL_FLOAT32:
 294                         itype = &Float32Type;
 295                         break;
 296                 case SPECIAL_INTERNAL_FLOAT64:
 297                         itype = &Float64Type;
 298                         break;
 299                 case SPECIAL_INTERNAL_FLOAT128:
 300                         itype = &Float128Type;
 301                         break;
 302
 303                 case SPECIAL_INTERNAL_INTPTR:
 304                         itype = &IntPtrType;
 305                         break;
 306                 case SPECIAL_INTERNAL_UINTPTR:
 307                         itype = &UIntPtrType;
 308                         break;
 309                 case SPECIAL_INTERNAL_OFF:
 310                         itype = &OffType;
 311                         break;
 312                 case SPECIAL_INTERNAL_SIZE:
 313                         itype = &SizeType;
 314                         break;
 315                 /* NOTE: There is no ssize_t in rune. size_t is signed */
 316
 317                 case SPECIAL_INTERNAL_POINTER:
 318                         itype = &PointerType;
 319                         break;
 320                 case SPECIAL_INTERNAL_NUMERIC:
 321                         itype = &NumericType;
 322                         break;
 323                 case SPECIAL_INTERNAL_INTEGRAL:
 324                         itype = &IntegralType;
 325                         break;
 326                 case SPECIAL_INTERNAL_SINTEGER:
 327                         /*
 328                          * Special flag helper (resolver sets TF_ISINTEGER in
 329                          * in the type)
 330                          */
 331                         itype = &SIntegerType;
 332                         d->d_ClassDecl.ed_SemGroup->sg_Flags |= SGF_ISINTEGER;
 333                         break;
 334                 case SPECIAL_INTERNAL_UINTEGER:
 335                         /*
 336                          * Special flag helper (resolver sets TF_ISINTEGER
 337                          * and TF_ISUNSIGNED in the type)
 338                          */
 339                         itype = &UIntegerType;
 340                         d->d_ClassDecl.ed_SemGroup->sg_Flags |= SGF_ISUNSIGNED;
 341                         d->d_ClassDecl.ed_SemGroup->sg_Flags |= SGF_ISINTEGER;
 342                         break;
 343
 344                 case SPECIAL_INTERNAL_LEXREF:
 345                         itype = &LexRefType;
 346                         break;
 347                 case SPECIAL_INTERNAL_SCOPE:
 348                         itype = &ScopeType;
 349                         break;
 350                 case SPECIAL_INTERNAL_DECLARATION:
 351                         itype = &DeclarationType;
 352                         break;
 353                 case SPECIAL_INTERNAL_SEMGROUP:
 354                         itype = &SemGroupType;
 355                         break;
 356                 case SPECIAL_INTERNAL_TYPE:
 357                         itype = &TypeType;
 358                         break;
 359                 case SPECIAL_INTERNAL_FILLERTYPE:
 360                         itype = &FILLERTypeType;
 361                         break;
 362                 case SPECIAL_INTERNAL_FILLERDECL:
 363                         itype = &FILLERDeclType;
 364                         break;
 365                 default:
 366                         dpanic("Unknown internal class: %s", d->d_Id);
 367                         break;
 368                 }
 369         }
 370         initInternalClassType(itype, d);
 371
 372         /*
 373          * Fixup for const int8 pointers... we did not have
 374          * a QList to put CCharType on until now.  It will
 375          * wind up on the SemGroup's sg_ClassList.
 376          */
 377         if (itype == &UInt8Type) {
 378                 TypeToQualType(itype, &CCharType,
 379                                itype->ty_SQFlags | SF_CONST, NULL);
 380         }
 381
 382         return(t);
 383 }
 384
 385 /*
 386  * This is mostly deprecated except for official type aliases such as
 387  * intptr_t.
 388  */
 389 int
 390 InternalTypeAttach(Parse *p, int t, Declaration *d)
 391 {
 392         Type *itype = NULL;
 393         int s;
 394
 395         dassert_decl(d, d->d_Op == DOP_TYPEDEF);
 396
 397         if ((s = StrTableSpecial(d->d_Id)) & SPECIALF_INTERNAL) {
 398                 switch(s) {
 399                 case SPECIAL_INTERNAL_VOID:
 400                         itype = &VoidType;
 401                         break;
 402                 case SPECIAL_INTERNAL_BOOL:
 403                         itype = &BoolType;
 404                         break;
 405                 case SPECIAL_INTERNAL_INT8:
 406                         itype = &Int8Type;
 407                         break;
 408                 case SPECIAL_INTERNAL_UINT8:
 409                         itype = &UInt8Type;
 410                         break;
 411                 case SPECIAL_INTERNAL_INT16:
 412                         itype = &Int16Type;
 413                         break;
 414                 case SPECIAL_INTERNAL_UINT16:
 415                         itype = &UInt16Type;
 416                         break;
 417                 case SPECIAL_INTERNAL_INT32:
 418                         itype = &Int32Type;
 419                         break;
 420                 case SPECIAL_INTERNAL_UINT32:
 421                         itype = &UInt32Type;
 422                         break;
 423                 case SPECIAL_INTERNAL_INT64:
 424                         itype = &Int64Type;
 425                         break;
 426                 case SPECIAL_INTERNAL_UINT64:
 427                         itype = &UInt64Type;
 428                         break;
 429
 430                 case SPECIAL_INTERNAL_FLOAT32:
 431                         itype = &Float32Type;
 432                         break;
 433                 case SPECIAL_INTERNAL_FLOAT64:
 434                         itype = &Float64Type;
 435                         break;
 436                 case SPECIAL_INTERNAL_FLOAT128:
 437                         itype = &Float128Type;
 438                         break;
 439
 440                 case SPECIAL_INTERNAL_INTPTR:
 441                         itype = &IntPtrType;
 442                         break;
 443                 case SPECIAL_INTERNAL_UINTPTR:
 444                         itype = &UIntPtrType;
 445                         break;
 446                 case SPECIAL_INTERNAL_OFF:
 447                         itype = &OffType;
 448                         break;
 449                 case SPECIAL_INTERNAL_SIZE:
 450                         itype = &SizeType;
 451                         break;
 452                 /* NOTE: There is no ssize_t in rune. size_t is signed */
 453
 454                 case SPECIAL_INTERNAL_POINTER:
 455                         itype = &PointerType;
 456                         break;
 457                 case SPECIAL_INTERNAL_NUMERIC:
 458                         itype = &NumericType;
 459                         break;
 460                 case SPECIAL_INTERNAL_INTEGRAL:
 461                         itype = &IntegralType;
 462                         break;
 463                 case SPECIAL_INTERNAL_SINTEGER:
 464                         itype = &SIntegerType;
 465                         break;
 466                 case SPECIAL_INTERNAL_UINTEGER:
 467                         itype = &UIntegerType;
 468                         break;
 469                 default:
 470                         itype = InternalRegisteredTypeLookup(d->d_Id);
 471                         if (itype == NULL)
 472                                 dpanic("Unknown internal type: %s", d->d_Id);
 473                         break;
 474                 }
 475         }
 476         if (itype) {
 477                 if (itype->ty_Op != TY_UNRESOLVED) {
 478                         t = LexError(&p->p_Token, TOK_ERR_DUPLICATE_ATTACH);
 479                 } else {
 480                         Type *ntype = d->d_TypedefDecl.ed_Type;
 481
 482                         TypeToQualType(ntype, itype, ntype->ty_SQFlags, NULL);
 483                 }
 484         } else {
 485                 t = LexError(&p->p_Token, TOK_ERR_UNRECOGNIZED_ATTACH);
 486         }
 487         return(t);
 488 }
 489
 490 Type *
 491 AllocType(typelist_t *list, int op)
 492 {
 493         Type *type = zalloc(sizeof(Type));
 494
 495         initType(type, list, op);
 496         return(type);
 497 }
 498
 499 /*
 500  * May be used to generate a varargs compound type, in which case the
 501  * semgroup may already be resolved.
 502  *
 503  * We do no matching/caching at this time and callers assume that (for
 504  * making adjustments) to the underlying sg at parse-time via
 505  * TypeToProcType()
 506  */
 507 Type *
 508 AllocCompoundType(SemGroup *sg)
 509 {
 510         Type *type;
 511
 512         type = AllocType(&CompoundTypeList, TY_COMPOUND);
 513         type->ty_CompType.et_SemGroup = sg;
 514         dassert((sg->sg_Flags & SGF_RESOLVED) == 0);
 515         return(type);
 516 }
 517
 518 /*
 519  * XXX match the compound type(s)
 520  */
 521 Type *
 522 AllocArgsType(SemGroup *sg)
 523 {
 524         Type *type;
 525
 526         type = AllocType(&ArgsTypeList, TY_ARGS);
 527         type->ty_ArgsType.et_SemGroup = sg;
 528         return(type);
 529 }
 530
 531 Type *
 532 AllocStorageType(runesize_t bytes)
 533 {
 534         Type *type;
 535
 536         RUNE_FOREACH(type, &StorageTypeList, ty_Node) {
 537                 if (type->ty_Op == TY_STORAGE &&
 538                         type->ty_StorType.et_Bytes == bytes
 539                 ) {
 540                         return(type);
 541                 }
 542         }
 543         type = AllocType(&StorageTypeList, TY_STORAGE);
 544         type->ty_StorType.et_Bytes = bytes;
 545         return(type);
 546 }
 547
 548 Type *
 549 AllocUnresolvedType(SemGroup *isg, SemGroup *sg, string_t *ary, int eatAry)
 550 {
 551         Type *type = NULL;
 552
 553         dassert_semgrp(sg, ary != NULL);
 554
 555         RUNE_FOREACH(type, &sg->sg_ClassList, ty_Node) {
 556                 int i;
 557
 558                 if (type->ty_Op != TY_UNRESOLVED)
 559                         continue;
 560                 if (type->ty_UnresType.et_ImportSemGroup != isg)
 561                         continue;
 562
 563                 for (i = 0; ary[i]; ++i) {
 564                         if (ary[i] != type->ty_UnresType.et_DottedId[i])
 565                                 break;
 566                 }
 567                 if (ary[i] == NULL &&
 568                     type->ty_UnresType.et_DottedId[i] == NULL) {
 569                         if (eatAry)
 570                                 FreeDotIdAry(ary);
 571                         return(type);
 572                 }
 573         }
 574         type = AllocType((sg ? &sg->sg_ClassList : NULL), TY_UNRESOLVED);
 575         type->ty_UnresType.et_DottedId = ary;
 576         type->ty_UnresType.et_SemGroup = sg;            /* may be NULL */
 577         type->ty_UnresType.et_ImportSemGroup = isg;     /* may be NULL */
 578         return(type);
 579 }
 580
 581 /*
 582  * AllocClassType() - allocate a type representing a the semgroup which
 583  *                      in turn represents (typically) a class.
 584  */
 585 Type *
 586 AllocClassType(typelist_t *list, Type *super, SemGroup *sg, int visibility)
 587 {
 588         Type *type;
 589
 590         dassert(sg != NULL);
 591         list = &sg->sg_ClassList;
 592
 593         RUNE_FOREACH(type, list, ty_Node) {
 594                 if (type->ty_Op == TY_CLASS &&
 595                     type->ty_ClassType.et_SemGroup == sg &&
 596                     type->ty_ClassType.et_Super == super &&
 597                     type->ty_Visibility == visibility
 598                 ) {
 599                         return(type);
 600                 }
 601         }
 602         if (sg)
 603                 dassert(&sg->sg_ClassList == list);
 604         type = AllocType(list, TY_CLASS);
 605         type->ty_ClassType.et_SemGroup = sg;
 606         type->ty_ClassType.et_Super = super;
 607         type->ty_Visibility = visibility;
 608         return(type);
 609 }
 610
 611 static
 612 void
 613 initInternalClassType(Type *type, Declaration *d)
 614 {
 615         SemGroup *sg = d->d_ClassDecl.ed_SemGroup;
 616
 617         initType(type, &sg->sg_ClassList, TY_CLASS);
 618         RUNE_REMOVE(&sg->sg_ClassList, type, ty_Node);
 619         RUNE_INSERT_HEAD(&sg->sg_ClassList, type, ty_Node);
 620         type->ty_ClassType.et_SemGroup = d->d_ClassDecl.ed_SemGroup;
 621         type->ty_ClassType.et_Super = d->d_ClassDecl.ed_Super;
 622         type->ty_Visibility = d->d_ScopeFlags & SCOPE_ALL_VISIBLE;
 623         type->ty_Flags |= TF_ISINTERNAL;
 624 }
 625
 626 Type *
 627 AllocImportType(typelist_t *list, SemGroup *sg, int visibility)
 628 {
 629         Type *type = AllocType(list, TY_IMPORT);
 630
 631         type->ty_ImportType.et_SemGroup = sg;
 632         type->ty_Visibility = visibility;
 633         return(type);
 634 }
 635
 636 /*
 637  * adjtype must be moved to type's QList because type is being modified
 638  * such that that is where it is expected to be.
 639  */
 640 Type *
 641 TypeAdjustQList(Type *type, Type *adjtype)
 642 {
 643         if (adjtype) {
 644                 if (adjtype->ty_SQList)
 645                         RUNE_REMOVE(adjtype->ty_SQList, adjtype, ty_Node);
 646                 adjtype->ty_SQList = &type->ty_QList;
 647                 RUNE_INSERT_TAIL(adjtype->ty_SQList, adjtype, ty_Node);
 648         }
 649         return type;
 650 }
 651
 652 /*
 653  * Adjust the type to be locked storage.  Assumes that compound types
 654  * have not been cached/collapsed (parse-time only).
 655  */
 656 Type *
 657 TypeAdjustLockedStorage(Type *type)
 658 {
 659         SemGroup *sg;
 660         Declaration *d;
 661
 662         if (type->ty_Op != TY_COMPOUND)
 663                 return type;
 664
 665         /*
 666          * Assume no matching collapse yet
 667          */
 668         sg = type->ty_CompType.et_SemGroup;
 669         RUNE_FOREACH(d, &sg->sg_DeclList, d_Node) {
 670                 if (d->d_Op != DOP_GROUP_STORAGE)
 671                         continue;
 672                 d->d_ScopeFlags &= ~SCOPE_UNLOCKED;
 673         }
 674         return type;
 675 }
 676
 677 Type *
 678 TypeToQualType(Type *otype, Type *ntype, int sqFlags, Exp *exp)
 679 {
 680         SemGroup *sg;
 681
 682         /*
 683          * Combine with existing qualifiers, Shortcut if no changes made.
 684          */
 685         if (ntype == NULL &&
 686             sqFlags == otype->ty_SQFlags &&
 687             (exp == NULL || exp == otype->ty_AssExp)
 688         ) {
 689                 return(otype);
 690         }
 691
 692         /*
 693          * See if we already have a matching qualified type (only if storage
 694          * for the new type is not being provided).  Note: the provided storage
 695          * has already been initType()d
 696          */
 697         if (ntype == NULL) {
 698                 RUNE_FOREACH(ntype, otype->ty_SQList, ty_Node) {
 699                         if (ntype->ty_Op == otype->ty_Op &&
 700                             ntype->ty_SQFlags == sqFlags &&
 701                             (exp == NULL || ntype->ty_AssExp == exp)
 702                         ) {
 703                                 if (SameType(ntype, otype, sqFlags))
 704                                         return(ntype);
 705                         }
 706                 }
 707         }
 708
 709         /*
 710          * Build a new qualified type and set its qualifiers, then duplicate
 711          * appropriate sections of the old type.
 712          *
 713          * Default to the same SQList as otype.
 714          */
 715         if (ntype == NULL) {
 716                 ntype = AllocType(otype->ty_SQList, otype->ty_Op);
 717         } else {
 718                 if (ntype->ty_SQList)
 719                         RUNE_REMOVE(ntype->ty_SQList, ntype, ty_Node);
 720                 ntype->ty_SQList = otype->ty_SQList;
 721                 RUNE_INSERT_TAIL(ntype->ty_SQList, ntype, ty_Node);
 722         }
 723
 724         /*
 725          * Set the op and the expression.  Unlike SQFlags, if exp is passed as
 726          * NULL we inherit the old type's default.
 727          *
 728          * The DupExp() call here is special, see DupExp()'s handling of
 729          * ex_Decl.
 730          *
 731          * Normally DupExp() is called during resolution prior to ex_Decl
 732          * being set.  This is the one case where it may be called with
 733          * ex_Decl already set.
 734          *
 735          * WARNING! We do not try to resolve the type here.  Various resolve
 736          *          related flags in ty_Flags will be resolved later.  This
 737          *          includes TF_ISUNSIGNED and other TF_* flags.
 738          */
 739         ntype->ty_Op = otype->ty_Op;
 740         if (exp)
 741                 ntype->ty_AssExp = exp;
 742         else if (otype->ty_AssExp)
 743                 ntype->ty_AssExp = SetDupExp(NULL, otype->ty_AssExp);
 744         ntype->ty_SQFlags = sqFlags;
 745         ntype->ty_Visibility = otype->ty_Visibility;
 746
 747         switch(otype->ty_Op) {
 748         case TY_CLASS:
 749                 /*
 750                  * When updating the class, alternative forms are collapsed
 751                  * into it's SemGroup->sg_ClassList and not into some
 752                  * potentially long recursive chain based on ty_QList.
 753                  */
 754                 sg = otype->ty_ClassType.et_SemGroup;
 755
 756                 dassert(ntype->ty_SQList == &sg->sg_ClassList);
 757                 if (ntype->ty_ClassType.et_SemGroup != sg) {
 758                         ntype->ty_ClassType.et_SemGroup = sg;
 759                 }
 760                 ntype->ty_ClassType.et_Super = otype->ty_ClassType.et_Super;
 761                 break;
 762         case TY_IMPORT:
 763                 ntype->ty_Visibility = otype->ty_Visibility;
 764                 ntype->ty_ImportType.et_SemGroup = otype->ty_ImportType.et_SemGroup;
 765                 break;
 766         case TY_CPTRTO:
 767                 ntype->ty_CPtrType.et_Type = otype->ty_CPtrType.et_Type;
 768                 break;
 769         case TY_PTRTO:
 770                 ntype->ty_PtrType.et_Type = otype->ty_PtrType.et_Type;
 771                 break;
 772         case TY_REFTO:
 773                 ntype->ty_RefType.et_Type = otype->ty_RefType.et_Type;
 774                 break;
 775         case TY_ARYOF:
 776                 /*
 777                  * note: multiple type structures may share the same array size
 778                  * expression in simple qualified-type cases.  YYY XXX bad bad.
 779                  */
 780                 ntype->ty_AryType.et_Type = otype->ty_AryType.et_Type;
 781                 ntype->ty_AryType.et_ArySize = otype->ty_AryType.et_ArySize;
 782                 ntype->ty_AryType.et_SemGroup = otype->ty_AryType.et_SemGroup;
 783                 break;
 784         case TY_COMPOUND:
 785                 ntype->ty_CompType.et_SemGroup = otype->ty_CompType.et_SemGroup;
 786                 break;
 787         case TY_VAR:
 788                 ntype->ty_VarType.et_Type = otype->ty_VarType.et_Type;
 789                 ntype->ty_VarType.et_SemGroup = otype->ty_VarType.et_SemGroup;
 790                 break;
 791         case TY_ARGS:
 792                 ntype->ty_ArgsType.et_SemGroup = otype->ty_ArgsType.et_SemGroup;
 793                 break;
 794         case TY_PROC:
 795                 ntype->ty_ProcType.et_ArgsType = otype->ty_ProcType.et_ArgsType;
 796                 ntype->ty_ProcType.et_RetType = otype->ty_ProcType.et_RetType;
 797                 ntype->ty_ProcType.et_ArgCount = otype->ty_ProcType.et_ArgCount;
 798                 dassert(ntype->ty_SQList ==
 799                         &otype->ty_ProcType.et_RetType->ty_QList);
 800                 break;
 801         case TY_STORAGE:
 802                 ntype->ty_StorType.et_Bytes = otype->ty_StorType.et_Bytes;
 803                 break;
 804         case TY_DYNAMIC:
 805                 /*
 806                  * It is not legal to qualify a dynamic type other then to
 807                  * add or remove SF_LVALUE.
 808                  */
 809                 dpanic("Dynamic type cannot be qualified");
 810                 break;
 811         case TY_UNRESOLVED:
 812                 ntype->ty_UnresType.et_DottedId =
 813                         otype->ty_UnresType.et_DottedId;
 814                 ntype->ty_UnresType.et_SemGroup =
 815                         otype->ty_UnresType.et_SemGroup;
 816                 ntype->ty_UnresType.et_ImportSemGroup =
 817                         otype->ty_UnresType.et_ImportSemGroup;
 818                 break;
 819         default:
 820                 dassert_type(otype, 0);
 821         }
 822         return(ntype);
 823 }
 824
 825 /*
 826  * Convert a return-type + argument-type into a procedure type.  If
 827  * adjret is non-zero the return-type is converted to locked storage
 828  * (which is generally what we want).
 829  *
 830  * Match the procedure type(s) (after adjustment?)
 831  */
 832 Type *
 833 TypeToProcType(Type *rtype, Type *atype, int adjret)
 834 {
 835         Type *type;
 836         runesize_t count = 0;
 837         Declaration *d;
 838         SemGroup *sg;
 839
 840         dassert_type(atype, atype->ty_Op == TY_ARGS);
 841
 842         if (adjret)
 843                 rtype = TypeAdjustLockedStorage(rtype);
 844
 845         sg = atype->ty_CompType.et_SemGroup;
 846
 847         RUNE_FOREACH(d, &sg->sg_DeclList, d_Node) {
 848                 ++count;
 849         }
 850         RUNE_FOREACH(type, &rtype->ty_QList, ty_Node) {
 851                 if (type->ty_Op == TY_PROC) {
 852                         if (type->ty_ProcType.et_ArgsType == atype &&
 853                             type->ty_ProcType.et_RetType == rtype &&
 854                             type->ty_ProcType.et_ArgCount == count
 855                         ) {
 856                                 return(type);
 857                         }
 858                 }
 859         }
 860         type = AllocType(&rtype->ty_QList, TY_PROC);
 861         type->ty_ProcType.et_ArgsType = AllocArgsType(sg);
 862         type->ty_ProcType.et_RetType = rtype;
 863         type->ty_ProcType.et_ArgCount = count;
 864         return(type);
 865 }
 866
 867 /*
 868  * Convert type to pointer-to-type
 869  */
 870 Type *
 871 TypeToPtrType(Type *otype)
 872 {
 873         Type *type;
 874
 875         RUNE_FOREACH(type, &otype->ty_QList, ty_Node) {
 876                 if (type->ty_Op == TY_PTRTO)
 877                         return(type);
 878         }
 879         type = AllocType(&otype->ty_QList, TY_PTRTO);
 880         type->ty_PtrType.et_Type = otype;
 881         return(type);
 882 }
 883
 884 /*
 885  * Convert type to pointer-to-type
 886  */
 887 Type *
 888 TypeToCPtrType(Type *otype)
 889 {
 890         Type *type;
 891
 892         RUNE_FOREACH(type, &otype->ty_QList, ty_Node) {
 893                 if (type->ty_Op == TY_CPTRTO)
 894                         return(type);
 895         }
 896         type = AllocType(&otype->ty_QList, TY_CPTRTO);
 897         type->ty_CPtrType.et_Type = otype;
 898         return(type);
 899 }
 900
 901 /*
 902  * Convert type to ref-to-type
 903  *
 904  *      A reference type is similar to a pointer type except that the
 905  *      resolver is not able to entirely know what it is pointing to.
 906  *      The reference type is a superclass, but the actual type is
 907  *      stored in the run-time structure.
 908  */
 909 Type *
 910 TypeToRefType(Type *otype)
 911 {
 912         Type *type;
 913
 914         RUNE_FOREACH(type, &otype->ty_QList, ty_Node) {
 915                 if (type->ty_Op == TY_REFTO)
 916                         return(type);
 917         }
 918         type = AllocType(&otype->ty_QList, TY_REFTO);
 919         type->ty_RefType.et_Type = otype;
 920         return(type);
 921 }
 922
 923 Type *
 924 TypeToAryType(Type *otype, Exp *exp, SemGroup *sg)
 925 {
 926         Type *type;
 927
 928         /*
 929          * XXX handle constant expression optimization for QList
 930          * XXX handle qualifiers
 931          */
 932         type = AllocType(&otype->ty_QList, TY_ARYOF);
 933         type->ty_AryType.et_ArySize = exp;
 934         type->ty_AryType.et_Type = DelTypeQual(otype, SF_MASK_ARY_INHERIT);
 935         type->ty_AryType.et_SemGroup = sg;
 936         type->ty_SQFlags |= otype->ty_SQFlags & SF_MASK_ARY_INHERIT;
 937         return(type);
 938 }
 939
 940 #if 0
 941
 942 Type *
 943 TypeToRunTimeAryType(Type *otype, int count)
 944 {
 945         Type *type;
 946         Type *t2 = DelTypeQual(otype, SF_MASK_ARY_INHERIT);
 947
 948         RUNE_FOREACH(type, &otype->ty_QList, ty_Node) {
 949                 if (type->ty_Op == TY_ARYOF &&
 950                         type->ty_AryType.et_Type == t2 &&
 951                         type->ty_AryType.et_Count == count &&
 952                         type->ty_SQFlags ==
 953                          (otype->ty_SQFlags & SF_MASK_ARY_INHERIT)
 954                 ) {
 955                         return(type);
 956                 }
 957         }
 958         type = AllocType(&otype->ty_QList, TY_ARYOF);
 959         type->ty_AryType.et_Count = count;
 960         type->ty_AryType.et_Type = t2;
 961         type->ty_SQFlags |= otype->ty_SQFlags & SF_MASK_ARY_INHERIT;
 962         return(type);
 963 }
 964
 965 #endif
 966
 967 Type *
 968 TypeToVarType(Type *otype, SemGroup *sg)
 969 {
 970         Type *type;
 971
 972         dassert(sg->sg_Flags & SGF_RESOLVED);
 973         dassert(otype->ty_Flags & TF_RESOLVED);
 974
 975         RUNE_FOREACH(type, &otype->ty_QList, ty_Node) {
 976                 if (type->ty_Op == TY_VAR &&
 977                     type->ty_VarType.et_Type == otype &&
 978                     type->ty_VarType.et_SemGroup == sg
 979                 ) {
 980                         puts("SG2"); /* YYY */
 981                         return(type);
 982                 }
 983         }
 984         type = AllocType(&otype->ty_QList, TY_VAR);
 985         type->ty_VarType.et_Type = otype;
 986         type->ty_VarType.et_SemGroup = sg;
 987 #if 0
 988         /* XXX doesn't work for var-args */
 989         if (sg->sg_Flags & SGF_RESOLVED) {
 990                 type->ty_Flags |= TF_RESOLVED;
 991                 type->ty_Bytes = sg->sg_Bytes;
 992                 type->ty_AlignMask = sg->sg_AlignMask;
 993         }
 994 #endif
 995         return(type);
 996 }
 997
 998 /*
 999  * ChangeType() - given pointer, C pointer, or array of something,
1000  *                return 'op' of something instead.
1001  */
1002 Type *
1003 ChangeType(Type *type, int op)
1004 {
1005         switch(type->ty_Op) {
1006         case TY_PTRTO:
1007                 switch(op) {
1008                 case TY_CPTRTO:
1009                         type = TypeToCPtrType(type->ty_PtrType.et_Type);
1010                         break;
1011                 case TY_ARYOF:
1012                         type = TypeToAryType(type->ty_PtrType.et_Type,
1013                                              NULL, NULL);
1014                         break;
1015                 default:
1016                         dpanic("Illegal type convesion (A)");
1017                 }
1018                 break;
1019         case TY_CPTRTO:
1020                 switch(op) {
1021                 case TY_PTRTO:
1022                         type = TypeToPtrType(type->ty_CPtrType.et_Type);
1023                         break;
1024                 case TY_ARYOF:
1025                         type = TypeToAryType(type->ty_CPtrType.et_Type,
1026                                              NULL, NULL);
1027                         break;
1028                 default:
1029                         dpanic("Illegal type convesion (B)");
1030                 }
1031                 break;
1032         case TY_ARYOF:
1033                 switch(op) {
1034                 case TY_PTRTO:
1035                         type = TypeToPtrType(type->ty_AryType.et_Type);
1036                         break;
1037                 case TY_CPTRTO:
1038                         type = TypeToCPtrType(type->ty_AryType.et_Type);
1039                         break;
1040                 default:
1041                         dpanic("Illegal type convesion (C)");
1042                 }
1043                 break;
1044         default:
1045                 dpanic("Illegal type convesion (D)");
1046         }
1047         return(type);
1048 }
1049
1050 /*
1051  * BaseType() - return base type
1052  *
1053  *      Traverse the type to locate the base type.  Store the base type
1054  *      in *ptype and return the SemGroup, or return NULL if the base type
1055  *      does not have a SemGroup.
1056  */
1057 SemGroup *
1058 BaseType(Type **ptype)
1059 {
1060         Type *type = *ptype;
1061
1062         for (;;) {
1063                 switch(type->ty_Op) {
1064                 case TY_CPTRTO:
1065                         type = type->ty_CPtrType.et_Type;
1066                         continue;
1067                 case TY_PTRTO:
1068                         type = type->ty_PtrType.et_Type;
1069                         continue;
1070                 case TY_REFTO:
1071                         type = type->ty_RefType.et_Type;
1072                         continue;
1073                 case TY_ARYOF:
1074                         type = type->ty_AryType.et_Type;
1075                         continue;
1076                 }
1077                 break;
1078         }
1079
1080         *ptype = type;
1081
1082         switch(type->ty_Op) {
1083         case TY_CLASS:
1084                 return(type->ty_ClassType.et_SemGroup);
1085         case TY_COMPOUND:
1086                 return(type->ty_CompType.et_SemGroup);
1087         case TY_ARGS:
1088                 return(type->ty_ArgsType.et_SemGroup);
1089         case TY_PROC:
1090         case TY_VAR:
1091         case TY_DYNAMIC:
1092         case TY_STORAGE:
1093                 return(NULL);
1094         case TY_UNRESOLVED:
1095         default:
1096                 dassert_type(type, 0);
1097                 return(NULL);   /* avoid compiler complaints */
1098         }
1099 }
1100
1101 /*
1102  * DupType()     - create a duplicate of a type, possibly in a new SemGroup.
1103  *
1104  *      This code is used when duplicating procedures and other elements
1105  *      when merging a superclass into a subclass.
1106  *
1107  *      If sg is NULL, stype is simply returned.  The case is used when we
1108  *      try to duplciate an expression with DupExp()... in that case we
1109  *      want to dup the expression tree but use the same types.
1110  */
1111 Type *
1112 DupType(SemGroup *sg, Type *stype)
1113 {
1114         Type *type = NULL;
1115
1116         if (sg == NULL)
1117                 return(stype);
1118
1119         /*
1120          * XXX type may be resolved if it is part of a varargs dup
1121          */
1122 #if 0
1123         dassert_type(stype,
1124                      (stype->ty_Flags & (TF_RESOLVED|TF_RESOLVING)) == 0);
1125 #endif
1126
1127         switch(stype->ty_Op) {
1128         case TY_CLASS:
1129                 /*
1130                  * This only occurs because the resolver has resolved an
1131                  * unresolved type on the original SemGroup.  We duplicate
1132                  * that on the new SemGroup.
1133                  */
1134                 type = AllocClassType(&sg->sg_ClassList,
1135                                       stype->ty_ClassType.et_Super,
1136                                       stype->ty_ClassType.et_SemGroup,
1137                                       stype->ty_Visibility);
1138                 break;
1139         case TY_IMPORT:
1140         case TY_DYNAMIC:
1141                 type = stype;
1142                 break;
1143         case TY_CPTRTO:
1144                 type = TypeToCPtrType(DupType(sg, stype->ty_CPtrType.et_Type));
1145                 break;
1146         case TY_PTRTO:
1147                 type = TypeToPtrType(DupType(sg, stype->ty_PtrType.et_Type));
1148                 break;
1149         case TY_REFTO:
1150                 type = TypeToRefType(DupType(sg, stype->ty_RefType.et_Type));
1151                 break;
1152         case TY_ARYOF:
1153                 type = TypeToAryType(DupType(sg, stype->ty_AryType.et_Type),
1154                                 SetDupExp(sg, stype->ty_AryType.et_ArySize),
1155                                 stype->ty_AryType.et_SemGroup);
1156                 break;
1157         case TY_VAR:
1158                 type = TypeToVarType(DupType(sg, stype->ty_VarType.et_Type),
1159                                 DupSemGroup(sg, NULL,
1160                                             stype->ty_VarType.et_SemGroup, 1));
1161                 break;
1162         case TY_COMPOUND:
1163                 type = AllocCompoundType(
1164                                 DupSemGroup(sg, NULL,
1165                                             stype->ty_CompType.et_SemGroup, 1));
1166                 break;
1167         case TY_ARGS:
1168                 /*
1169                  * At the moment we always formally duplicate the arguments
1170                  * so we can modify them for methods below.
1171                  */
1172                 type = AllocArgsType(
1173                                 DupSemGroup(sg, NULL,
1174                                             stype->ty_CompType.et_SemGroup, 1));
1175                 break;
1176         case TY_PROC:
1177                 type = DupType(sg, stype->ty_ProcType.et_RetType);
1178                 type = TypeToProcType(type,
1179                                   DupType(sg, stype->ty_ProcType.et_ArgsType),
1180                                       1);
1181
1182                 /*
1183                  * If this is a method procedure, we have to change the
1184                  * first argument to point at our new subclass.  It was
1185                  * previously pointing at our superclass.   XXX the
1186                  * programmer can override the argument.  If it isn't a
1187                  * reference we have to assert.
1188                  */
1189                 if (sg->sg_Stmt->st_Op != ST_Class) {
1190                         /*
1191                          * XXX probably an inlined procedure, the type is
1192                          *     already correct.  Need an assertrion here.
1193                          */
1194                 } else if (stype->ty_SQFlags & SF_METHOD) {
1195                         SemGroup *asg = type->ty_ProcType.et_ArgsType->ty_ArgsType.et_SemGroup;
1196                         Declaration *d = RUNE_FIRST(&asg->sg_DeclList);
1197                         Type *thisType = d->d_StorDecl.ed_Type;
1198
1199                         dassert_decl(d, d->d_Id == String_This &&
1200                                         d->d_Op == DOP_ARGS_STORAGE);
1201                         dassert_decl(d, sg->sg_Stmt->st_Op == ST_Class);
1202                         if (thisType->ty_Op == TY_CLASS) {
1203                                 /* XXX sg_ClassList? right sg? */
1204                                 /* XXX correct visibility? */
1205                                 if (d->d_Search == NULL) {
1206                                         d->d_Search = d->d_StorDecl.ed_Type->
1207                                                       ty_ClassType.et_SemGroup;
1208                                 }
1209                                 d->d_StorDecl.ed_Type =
1210                                         AllocClassType(&sg->sg_ClassList,
1211                                                        sg->sg_Stmt->st_ClassStmt.es_Super,
1212                                                        sg->sg_Stmt->st_MyGroup,
1213                                                        SCOPE_ALL_VISIBLE);
1214                         } else {
1215                                 dassert_decl(d, thisType->ty_Op == TY_REFTO);
1216                         }
1217                 } else if (stype->ty_SQFlags & SF_GMETHOD) {
1218                         SemGroup *asg;
1219                         Declaration *d;
1220
1221                         asg = type->ty_ProcType.et_ArgsType->
1222                                 ty_ArgsType.et_SemGroup;
1223                         d = RUNE_FIRST(&asg->sg_DeclList);
1224
1225                         dassert_decl(d, d->d_Id == String_This &&
1226                                      d->d_Op == DOP_TYPEDEF);
1227                         dassert_decl(d, sg->sg_Stmt->st_Op == ST_Class);
1228                         dassert_decl(d, d->d_TypedefDecl.ed_Type->ty_Op ==
1229                                         TY_CLASS);
1230                         /* XXX sg_ClassList? right sg? */
1231                         /* XXX correct visibility? */
1232                         if (d->d_Search == NULL) {
1233                                 d->d_Search = d->d_TypedefDecl.ed_Type->
1234                                                ty_ClassType.et_SemGroup;
1235                         }
1236                         d->d_TypedefDecl.ed_Type =
1237                                 AllocClassType(&sg->sg_ClassList,
1238                                                sg->sg_Stmt->st_ClassStmt.es_Super,
1239                                                sg->sg_Stmt->st_MyGroup,
1240                                                SCOPE_ALL_VISIBLE);
1241                 }
1242                 break;
1243         case TY_STORAGE:
1244                 type = stype;
1245                 break;
1246         case TY_UNRESOLVED:
1247                 /*
1248                  * e.g. so elements in a superclass will see refined elements
1249                  * in the subclass.  Note that the original import semgroup
1250                  * is left intact so the semantic search mechanism uses it
1251                  * when the base sg (typically a subclass) fails.
1252                  */
1253                 type = AllocUnresolvedType(
1254                                 stype->ty_UnresType.et_ImportSemGroup,
1255                                 sg,
1256                                 stype->ty_UnresType.et_DottedId,
1257                                 0);
1258                 break;
1259         default:
1260                 dassert_type(stype, 0);
1261         }
1262
1263         if (type != stype) {
1264                 type->ty_Flags = stype->ty_Flags &
1265                                  ~(TF_ISINTERNAL | TF_RESOLVING);
1266                 type->ty_Bytes = stype->ty_Bytes;
1267                 type->ty_AlignMask = stype->ty_AlignMask;
1268                 type->ty_Visibility = stype->ty_Visibility;
1269                 type->ty_DynamicVector = stype->ty_DynamicVector;
1270         }
1271         if (stype->ty_AssExp || stype->ty_SQFlags != type->ty_SQFlags) {
1272                 type = TypeToQualType(type, NULL,
1273                                       stype->ty_SQFlags,
1274                                       SetDupExp(sg, stype->ty_AssExp));
1275         }
1276
1277         return(type);
1278 }
1279
1280 typereglist_t TypeRegList = RUNE_HEAD_INITIALIZER(TypeRegList);
1281
1282 void
1283 InternalRegisterType(const char *str, const char *linkname, Type *type)
1284 {
1285         static int Special = SPECIALF_REGISTERED|SPECIALF_INTERNAL|1;
1286         TypeRegNode *tr;
1287
1288         dassert(Special & SPECIALF_MASK);
1289         tr = zalloc(sizeof(TypeRegNode));
1290         tr->tr_Id = StrTableAlloc(str, strlen(str), Special++);
1291         tr->tr_Type = type;
1292         tr->tr_LinkName = linkname;
1293         RUNE_INSERT_TAIL(&TypeRegList, tr, tr_Node);
1294 }
1295
1296 Type *
1297 InternalRegisteredTypeLookup(string_t id)
1298 {
1299         TypeRegNode *tr;
1300
1301         RUNE_FOREACH(tr, &TypeRegList, tr_Node) {
1302                 if (tr->tr_Id == id)
1303                         return(tr->tr_Type);
1304         }
1305         return(NULL);
1306 }