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 PointerInfoType;
  56 Type TypeType;
  57 Type FILLERTypeType;
  58 Type FILLERDeclType;
  59
  60 typelist_t DynamicTypeList = RUNE_HEAD_INITIALIZER(DynamicTypeList);
  61 typelist_t CompoundTypeList = RUNE_HEAD_INITIALIZER(CompoundTypeList);
  62 typelist_t ArgsTypeList = RUNE_HEAD_INITIALIZER(ArgsTypeList);
  63 typelist_t StorageTypeList = RUNE_HEAD_INITIALIZER(StorageTypeList);
  64
  65 static void initInternalClassType(Type *type, Declaration *d);
  66
  67 Type *BaseTypeAry[] = {
  68                 &DynamicLValueType, &DynamicRValueType, &NumericType,
  69                 &IntegralType, &SIntegerType, &UIntegerType,
  70                 &VoidType, &BoolType, &Int8Type, &UInt8Type,
  71                 &Int16Type, &UInt16Type, &Int32Type, &UInt32Type,
  72                 &Int64Type, &UInt64Type, &Int128Type, &UInt128Type,
  73
  74                 &IntPtrType, &UIntPtrType, &OffType, &SizeType,
  75
  76                 &FloatType, &Float32Type, &Float64Type, &Float128Type,
  77
  78                 &PointerType, &CCharType, &StrType, &CharPtrType,
  79                 &CharPtrPtrType, &VoidPtrType, &VoidRefType, &CVoidPtrType,
  80                 &LVoidPtrType,
  81
  82                 &LexRefType, &ScopeType, &DeclarationType, &SemGroupType,
  83                 &PointerInfoType, &TypeType,
  84                 &FILLERTypeType, &FILLERDeclType,
  85                 NULL
  86 };
  87
  88 void
  89 initType(Type *type, typelist_t *list, int op)
  90 {
  91         type->ty_Op = op;
  92         RUNE_INIT(&type->ty_QList);
  93         if (list)
  94                 RUNE_INSERT_TAIL(list, type, ty_Node);
  95         type->ty_SQList = list;
  96         type->ty_Info.in_Type = type;
  97         type->ty_Info.in_Refs = PINFO_STATIC;
  98 }
  99
 100 void
 101 initQualType(Type *type, typelist_t *list, int op, int sqflags)
 102 {
 103         initType(type, list, op);
 104         type->ty_SQFlags = sqflags;
 105 }
 106
 107 void
 108 initPtrType(Type *type, Type *ptrto, int sqflags)
 109 {
 110         initQualType(type, &ptrto->ty_QList, TY_PTRTO, sqflags);
 111         type->ty_PtrType.et_Type = ptrto;
 112         /*type->ty_Bytes = sizeof(PointerStor);*/
 113         type->ty_AlignMask = POINTERSTOR_ALIGN;
 114 }
 115
 116 void
 117 initCPtrType(Type *type, Type *ptrto, int sqflags)
 118 {
 119         initQualType(type, &ptrto->ty_QList, TY_CPTRTO, sqflags);
 120         type->ty_PtrType.et_Type = ptrto;
 121         /*type->ty_Bytes = sizeof(void *);*/
 122         type->ty_AlignMask = sizeof(void *) - 1;
 123 }
 124
 125 static void
 126 initRefType(Type *type, Type *refto, int sqflags)
 127 {
 128         initQualType(type, &refto->ty_QList, TY_REFTO, sqflags);
 129         type->ty_RefType.et_Type = refto;
 130         /*type->ty_Bytes = sizeof(PointerStor);*/
 131         type->ty_AlignMask = POINTERSTOR_ALIGN;
 132 }
 133
 134 void
 135 TypeInit(void)
 136 {
 137         int i;
 138
 139         initQualType(&DynamicLValueType, &DynamicTypeList,
 140                      TY_DYNAMIC, SF_LVALUE);
 141         initType(&DynamicRValueType, &DynamicTypeList, TY_DYNAMIC);
 142         initType(&NumericType, NULL, TY_UNRESOLVED);
 143         initType(&IntegralType, NULL, TY_UNRESOLVED);
 144         initType(&SIntegerType, NULL, TY_UNRESOLVED);
 145         initType(&UIntegerType, NULL, TY_UNRESOLVED);
 146         initType(&FloatType, NULL, TY_UNRESOLVED);
 147         initType(&PointerType, NULL, TY_UNRESOLVED);
 148         PointerType.ty_AlignMask = POINTERSTOR_ALIGN;
 149
 150         initType(&VoidType, NULL, TY_UNRESOLVED);
 151         initType(&BoolType, NULL, TY_UNRESOLVED);
 152         initType(&Int8Type, NULL, TY_UNRESOLVED);
 153         initType(&UInt8Type, NULL, TY_UNRESOLVED);
 154         initType(&Int16Type, NULL, TY_UNRESOLVED);
 155         initType(&UInt16Type, NULL, TY_UNRESOLVED);
 156         initType(&Int32Type, NULL, TY_UNRESOLVED);
 157         initType(&UInt32Type, NULL, TY_UNRESOLVED);
 158         initType(&Int64Type, NULL, TY_UNRESOLVED);
 159         initType(&UInt64Type, NULL, TY_UNRESOLVED);
 160
 161         initType(&IntPtrType, NULL, TY_UNRESOLVED);
 162         initType(&UIntPtrType, NULL, TY_UNRESOLVED);
 163         initType(&OffType, NULL, TY_UNRESOLVED);
 164         initType(&SizeType, NULL, TY_UNRESOLVED);
 165
 166         initType(&Float32Type, NULL, TY_UNRESOLVED);
 167         initType(&Float64Type, NULL, TY_UNRESOLVED);
 168         initType(&Float128Type, NULL, TY_UNRESOLVED);
 169
 170         initQualType(&CCharType, NULL, TY_UNRESOLVED, SF_CONST);
 171         initPtrType(&StrType, &CCharType, 0);
 172         initPtrType(&CharPtrType, &UInt8Type, 0);
 173         initPtrType(&CharPtrPtrType, &CharPtrType, 0);
 174         initPtrType(&VoidPtrType, &VoidType, 0);
 175         initRefType(&VoidRefType, &VoidType, 0);
 176         initCPtrType(&CVoidPtrType, &VoidType, SF_CONST);
 177         initPtrType(&LVoidPtrType, &VoidType, SF_LVALUE);
 178
 179         /*
 180          * Mark internal types (not all are bound to classes so it is
 181          * easiest to just do it here).  This will prevent the collapse
 182          * code from trying to collapse our base types.
 183          */
 184         for (i = 0; BaseTypeAry[i]; ++i)
 185                 BaseTypeAry[i]->ty_Flags |= TF_ISINTERNAL;
 186
 187         StrTableAlloc("void", 4, SPECIAL_INTERNAL_VOID);
 188         StrTableAlloc("bool", 4, SPECIAL_INTERNAL_BOOL);
 189         StrTableAlloc("int8_t", 6, SPECIAL_INTERNAL_INT8);
 190         StrTableAlloc("uint8_t", 7, SPECIAL_INTERNAL_UINT8);
 191         StrTableAlloc("int16_t", 7, SPECIAL_INTERNAL_INT16);
 192         StrTableAlloc("uint16_t", 8, SPECIAL_INTERNAL_UINT16);
 193         StrTableAlloc("int32_t", 7, SPECIAL_INTERNAL_INT32);
 194         StrTableAlloc("uint32_t", 8, SPECIAL_INTERNAL_UINT32);
 195         StrTableAlloc("int64_t", 7, SPECIAL_INTERNAL_INT64);
 196         StrTableAlloc("uint64_t", 8, SPECIAL_INTERNAL_UINT64);
 197         StrTableAlloc("int128_t", 8, SPECIAL_INTERNAL_INT128);
 198         StrTableAlloc("uint128_t", 9, SPECIAL_INTERNAL_UINT128);
 199
 200         StrTableAlloc("float32_t", 9, SPECIAL_INTERNAL_FLOAT32);
 201         StrTableAlloc("float64_t", 9, SPECIAL_INTERNAL_FLOAT64);
 202         StrTableAlloc("float128_t", 10, SPECIAL_INTERNAL_FLOAT128);
 203
 204         StrTableAlloc("intptr_t", 8, SPECIAL_INTERNAL_INTPTR);
 205         StrTableAlloc("uintptr_t", 9, SPECIAL_INTERNAL_UINTPTR);
 206         StrTableAlloc("size_t", 6, SPECIAL_INTERNAL_SIZE);
 207         StrTableAlloc("off_t", 5, SPECIAL_INTERNAL_OFF);
 208
 209         StrTableAlloc("Float", 5, SPECIAL_INTERNAL_FLOAT);
 210         StrTableAlloc("Pointer", 7, SPECIAL_INTERNAL_POINTER);
 211         StrTableAlloc("Numeric", 7, SPECIAL_INTERNAL_NUMERIC);
 212         StrTableAlloc("Integral", 8, SPECIAL_INTERNAL_INTEGRAL);
 213         StrTableAlloc("SInteger", 8, SPECIAL_INTERNAL_SINTEGER);
 214         StrTableAlloc("UInteger", 8, SPECIAL_INTERNAL_UINTEGER);
 215
 216         StrTableAlloc("LexRef", 6, SPECIAL_INTERNAL_LEXREF);
 217         StrTableAlloc("Scope", 5, SPECIAL_INTERNAL_SCOPE);
 218         StrTableAlloc("Declaration", 11, SPECIAL_INTERNAL_DECLARATION);
 219         StrTableAlloc("SemGroup", 8, SPECIAL_INTERNAL_SEMGROUP);
 220         StrTableAlloc("PointerInfo", 11, SPECIAL_INTERNAL_POINTERINFO);
 221         StrTableAlloc("Type", 4, SPECIAL_INTERNAL_TYPE);
 222         StrTableAlloc("FILLERType", 10, SPECIAL_INTERNAL_FILLERTYPE);
 223         StrTableAlloc("FILLERDecl", 10, SPECIAL_INTERNAL_FILLERDECL);
 224
 225         StrTableAlloc("__count",        7,      SPECIAL_COUNT);
 226         StrTableAlloc("__data",         6,      SPECIAL_DATA);
 227         StrTableAlloc("__varcount",     10,     SPECIAL_VAR_COUNT);
 228         StrTableAlloc("__vardata",      9,      SPECIAL_VAR_DATA);
 229         StrTableAlloc("__typeid",       8,      SPECIAL_TYPEID);
 230         StrTableAlloc("__typestr",      9,      SPECIAL_TYPESTR);
 231         StrTableAlloc("NULL",           4,      SPECIAL_NULL);
 232 }
 233
 234 /*
 235  * Attach an internal class, creating a global summary type for it that
 236  * allows our interpreter and code generator to make various assumptions.
 237  */
 238 int
 239 InternalClassAttach(Parse *p __unused, int t, Declaration *d)
 240 {
 241         Type *itype = NULL;
 242         int s;
 243
 244         dassert_decl(d, d->d_Op == DOP_CLASS);
 245
 246         if ((s = StrTableSpecial(d->d_Id)) & SPECIALF_INTERNAL) {
 247                 switch(s) {
 248                 case SPECIAL_INTERNAL_VOID:
 249                         itype = &VoidType;
 250                         break;
 251                 case SPECIAL_INTERNAL_BOOL:
 252                         /*
 253                          * Special flag helper (resolver sets TF_ISBOOL in
 254                          * in the type)
 255                          */
 256                         itype = &BoolType;
 257                         d->d_ClassDecl.ed_SemGroup->sg_Flags |= SGF_ISBOOL;
 258                         break;
 259                 case SPECIAL_INTERNAL_INT8:
 260                         itype = &Int8Type;
 261                         break;
 262                 case SPECIAL_INTERNAL_UINT8:
 263                         itype = &UInt8Type;
 264                         break;
 265                 case SPECIAL_INTERNAL_INT16:
 266                         itype = &Int16Type;
 267                         break;
 268                 case SPECIAL_INTERNAL_UINT16:
 269                         itype = &UInt16Type;
 270                         break;
 271                 case SPECIAL_INTERNAL_INT32:
 272                         itype = &Int32Type;
 273                         break;
 274                 case SPECIAL_INTERNAL_UINT32:
 275                         itype = &UInt32Type;
 276                         break;
 277                 case SPECIAL_INTERNAL_INT64:
 278                         itype = &Int64Type;
 279                         break;
 280                 case SPECIAL_INTERNAL_UINT64:
 281                         itype = &UInt64Type;
 282                         break;
 283                 case SPECIAL_INTERNAL_INT128:
 284                         itype = &Int128Type;
 285                         break;
 286                 case SPECIAL_INTERNAL_UINT128:
 287                         itype = &UInt128Type;
 288                         break;
 289
 290                 case SPECIAL_INTERNAL_FLOAT:
 291                         /*
 292                          * Special flag helper (resolver sets TF_ISFLOATING in
 293                          * in the type)
 294                          */
 295                         itype = &FloatType;
 296                         d->d_ClassDecl.ed_SemGroup->sg_Flags |= SGF_ISFLOATING;
 297                         break;
 298                 case SPECIAL_INTERNAL_FLOAT32:
 299                         itype = &Float32Type;
 300                         break;
 301                 case SPECIAL_INTERNAL_FLOAT64:
 302                         itype = &Float64Type;
 303                         break;
 304                 case SPECIAL_INTERNAL_FLOAT128:
 305                         itype = &Float128Type;
 306                         break;
 307
 308                 case SPECIAL_INTERNAL_INTPTR:
 309                         itype = &IntPtrType;
 310                         break;
 311                 case SPECIAL_INTERNAL_UINTPTR:
 312                         itype = &UIntPtrType;
 313                         break;
 314                 case SPECIAL_INTERNAL_OFF:
 315                         itype = &OffType;
 316                         break;
 317                 case SPECIAL_INTERNAL_SIZE:
 318                         itype = &SizeType;
 319                         break;
 320                 /* NOTE: There is no ssize_t in rune. size_t is signed */
 321
 322                 case SPECIAL_INTERNAL_POINTER:
 323                         itype = &PointerType;
 324                         break;
 325                 case SPECIAL_INTERNAL_NUMERIC:
 326                         itype = &NumericType;
 327                         break;
 328                 case SPECIAL_INTERNAL_INTEGRAL:
 329                         itype = &IntegralType;
 330                         break;
 331                 case SPECIAL_INTERNAL_SINTEGER:
 332                         /*
 333                          * Special flag helper (resolver sets TF_ISINTEGER in
 334                          * in the type)
 335                          */
 336                         itype = &SIntegerType;
 337                         d->d_ClassDecl.ed_SemGroup->sg_Flags |= SGF_ISINTEGER;
 338                         break;
 339                 case SPECIAL_INTERNAL_UINTEGER:
 340                         /*
 341                          * Special flag helper (resolver sets TF_ISINTEGER
 342                          * and TF_ISUNSIGNED in the type)
 343                          */
 344                         itype = &UIntegerType;
 345                         d->d_ClassDecl.ed_SemGroup->sg_Flags |= SGF_ISUNSIGNED;
 346                         d->d_ClassDecl.ed_SemGroup->sg_Flags |= SGF_ISINTEGER;
 347                         break;
 348
 349                 case SPECIAL_INTERNAL_LEXREF:
 350                         itype = &LexRefType;
 351                         break;
 352                 case SPECIAL_INTERNAL_SCOPE:
 353                         itype = &ScopeType;
 354                         break;
 355                 case SPECIAL_INTERNAL_DECLARATION:
 356                         itype = &DeclarationType;
 357                         break;
 358                 case SPECIAL_INTERNAL_SEMGROUP:
 359                         itype = &SemGroupType;
 360                         break;
 361                 case SPECIAL_INTERNAL_POINTERINFO:
 362                         itype = &PointerInfoType;
 363                         break;
 364                 case SPECIAL_INTERNAL_TYPE:
 365                         itype = &TypeType;
 366                         break;
 367                 case SPECIAL_INTERNAL_FILLERTYPE:
 368                         itype = &FILLERTypeType;
 369                         break;
 370                 case SPECIAL_INTERNAL_FILLERDECL:
 371                         itype = &FILLERDeclType;
 372                         break;
 373                 default:
 374                         dpanic("Unknown internal class: %s", d->d_Id);
 375                         break;
 376                 }
 377         }
 378         initInternalClassType(itype, d);
 379
 380         /*
 381          * Fixup for const int8 pointers... we did not have
 382          * a QList to put CCharType on until now.  It will
 383          * wind up on the SemGroup's sg_ClassList.
 384          */
 385         if (itype == &UInt8Type) {
 386                 TypeToQualType(itype, &CCharType,
 387                                itype->ty_SQFlags | SF_CONST, NULL);
 388         }
 389
 390         return(t);
 391 }
 392
 393 /*
 394  * This is mostly deprecated except for official type aliases such as
 395  * intptr_t.
 396  */
 397 int
 398 InternalTypeAttach(Parse *p, int t, Declaration *d)
 399 {
 400         Type *itype = NULL;
 401         int s;
 402
 403         dassert_decl(d, d->d_Op == DOP_TYPEDEF);
 404
 405         if ((s = StrTableSpecial(d->d_Id)) & SPECIALF_INTERNAL) {
 406                 switch(s) {
 407                 case SPECIAL_INTERNAL_VOID:
 408                         itype = &VoidType;
 409                         break;
 410                 case SPECIAL_INTERNAL_BOOL:
 411                         itype = &BoolType;
 412                         break;
 413                 case SPECIAL_INTERNAL_INT8:
 414                         itype = &Int8Type;
 415                         break;
 416                 case SPECIAL_INTERNAL_UINT8:
 417                         itype = &UInt8Type;
 418                         break;
 419                 case SPECIAL_INTERNAL_INT16:
 420                         itype = &Int16Type;
 421                         break;
 422                 case SPECIAL_INTERNAL_UINT16:
 423                         itype = &UInt16Type;
 424                         break;
 425                 case SPECIAL_INTERNAL_INT32:
 426                         itype = &Int32Type;
 427                         break;
 428                 case SPECIAL_INTERNAL_UINT32:
 429                         itype = &UInt32Type;
 430                         break;
 431                 case SPECIAL_INTERNAL_INT64:
 432                         itype = &Int64Type;
 433                         break;
 434                 case SPECIAL_INTERNAL_UINT64:
 435                         itype = &UInt64Type;
 436                         break;
 437
 438                 case SPECIAL_INTERNAL_FLOAT32:
 439                         itype = &Float32Type;
 440                         break;
 441                 case SPECIAL_INTERNAL_FLOAT64:
 442                         itype = &Float64Type;
 443                         break;
 444                 case SPECIAL_INTERNAL_FLOAT128:
 445                         itype = &Float128Type;
 446                         break;
 447
 448                 case SPECIAL_INTERNAL_INTPTR:
 449                         itype = &IntPtrType;
 450                         break;
 451                 case SPECIAL_INTERNAL_UINTPTR:
 452                         itype = &UIntPtrType;
 453                         break;
 454                 case SPECIAL_INTERNAL_OFF:
 455                         itype = &OffType;
 456                         break;
 457                 case SPECIAL_INTERNAL_SIZE:
 458                         itype = &SizeType;
 459                         break;
 460                 /* NOTE: There is no ssize_t in rune. size_t is signed */
 461
 462                 case SPECIAL_INTERNAL_POINTER:
 463                         itype = &PointerType;
 464                         break;
 465                 case SPECIAL_INTERNAL_NUMERIC:
 466                         itype = &NumericType;
 467                         break;
 468                 case SPECIAL_INTERNAL_INTEGRAL:
 469                         itype = &IntegralType;
 470                         break;
 471                 case SPECIAL_INTERNAL_SINTEGER:
 472                         itype = &SIntegerType;
 473                         break;
 474                 case SPECIAL_INTERNAL_UINTEGER:
 475                         itype = &UIntegerType;
 476                         break;
 477                 default:
 478                         itype = InternalRegisteredTypeLookup(d->d_Id);
 479                         if (itype == NULL)
 480                                 dpanic("Unknown internal type: %s", d->d_Id);
 481                         break;
 482                 }
 483         }
 484         if (itype) {
 485                 if (itype->ty_Op != TY_UNRESOLVED) {
 486                         t = LexError(&p->p_Token, TOK_ERR_DUPLICATE_ATTACH);
 487                 } else {
 488                         Type *ntype = d->d_TypedefDecl.ed_Type;
 489
 490                         TypeToQualType(ntype, itype, ntype->ty_SQFlags, NULL);
 491                 }
 492         } else {
 493                 t = LexError(&p->p_Token, TOK_ERR_UNRECOGNIZED_ATTACH);
 494         }
 495         return(t);
 496 }
 497
 498 Type *
 499 AllocType(typelist_t *list, int op)
 500 {
 501         Type *type = zalloc(sizeof(Type));
 502
 503         initType(type, list, op);
 504         return(type);
 505 }
 506
 507 /*
 508  * May be used to generate a varargs compound type, in which case the
 509  * semgroup may already be resolved.
 510  *
 511  * We do no matching/caching at this time and callers assume that (for
 512  * making adjustments) to the underlying sg at parse-time via
 513  * TypeToProcType()
 514  */
 515 Type *
 516 AllocCompoundType(SemGroup *sg)
 517 {
 518         Type *type;
 519
 520         type = AllocType(&CompoundTypeList, TY_COMPOUND);
 521         type->ty_CompType.et_SemGroup = sg;
 522         dassert((sg->sg_Flags & SGF_RESOLVED) == 0);
 523         return(type);
 524 }
 525
 526 /*
 527  * XXX match the compound type(s)
 528  */
 529 Type *
 530 AllocArgsType(SemGroup *sg)
 531 {
 532         Type *type;
 533
 534         type = AllocType(&ArgsTypeList, TY_ARGS);
 535         type->ty_ArgsType.et_SemGroup = sg;
 536         return(type);
 537 }
 538
 539 Type *
 540 AllocStorageType(runesize_t bytes)
 541 {
 542         Type *type;
 543
 544         RUNE_FOREACH(type, &StorageTypeList, ty_Node) {
 545                 if (type->ty_Op == TY_STORAGE &&
 546                         type->ty_StorType.et_Bytes == bytes
 547                 ) {
 548                         return(type);
 549                 }
 550         }
 551         type = AllocType(&StorageTypeList, TY_STORAGE);
 552         type->ty_StorType.et_Bytes = bytes;
 553         return(type);
 554 }
 555
 556 Type *
 557 AllocUnresolvedType(SemGroup *isg, SemGroup *sg, string_t *ary, int eatAry)
 558 {
 559         Type *type = NULL;
 560
 561         dassert_semgrp(sg, ary != NULL);
 562
 563         RUNE_FOREACH(type, &sg->sg_ClassList, ty_Node) {
 564                 int i;
 565
 566                 if (type->ty_Op != TY_UNRESOLVED)
 567                         continue;
 568                 if (type->ty_UnresType.et_ImportSemGroup != isg)
 569                         continue;
 570
 571                 for (i = 0; ary[i]; ++i) {
 572                         if (ary[i] != type->ty_UnresType.et_DottedId[i])
 573                                 break;
 574                 }
 575                 if (ary[i] == NULL &&
 576                     type->ty_UnresType.et_DottedId[i] == NULL) {
 577                         if (eatAry)
 578                                 FreeDotIdAry(ary);
 579                         return(type);
 580                 }
 581         }
 582         type = AllocType((sg ? &sg->sg_ClassList : NULL), TY_UNRESOLVED);
 583         type->ty_UnresType.et_DottedId = ary;
 584         type->ty_UnresType.et_SemGroup = sg;            /* may be NULL */
 585         type->ty_UnresType.et_ImportSemGroup = isg;     /* may be NULL */
 586         return(type);
 587 }
 588
 589 /*
 590  * AllocClassType() - allocate a type representing a the semgroup which
 591  *                      in turn represents (typically) a class.
 592  */
 593 Type *
 594 AllocClassType(typelist_t *list, Type *super, SemGroup *sg, int visibility)
 595 {
 596         Type *type;
 597
 598         dassert(sg != NULL);
 599         list = &sg->sg_ClassList;
 600
 601         RUNE_FOREACH(type, list, ty_Node) {
 602                 if (type->ty_Op == TY_CLASS &&
 603                     type->ty_ClassType.et_SemGroup == sg &&
 604                     type->ty_ClassType.et_Super == super &&
 605                     type->ty_Visibility == visibility
 606                 ) {
 607                         return(type);
 608                 }
 609         }
 610         if (sg)
 611                 dassert(&sg->sg_ClassList == list);
 612         type = AllocType(list, TY_CLASS);
 613         type->ty_ClassType.et_SemGroup = sg;
 614         type->ty_ClassType.et_Super = super;
 615         type->ty_Visibility = visibility;
 616         return(type);
 617 }
 618
 619 static
 620 void
 621 initInternalClassType(Type *type, Declaration *d)
 622 {
 623         SemGroup *sg = d->d_ClassDecl.ed_SemGroup;
 624
 625         initType(type, &sg->sg_ClassList, TY_CLASS);
 626         RUNE_REMOVE(&sg->sg_ClassList, type, ty_Node);
 627         RUNE_INSERT_HEAD(&sg->sg_ClassList, type, ty_Node);
 628         type->ty_ClassType.et_SemGroup = d->d_ClassDecl.ed_SemGroup;
 629         type->ty_ClassType.et_Super = d->d_ClassDecl.ed_Super;
 630         type->ty_Visibility = d->d_ScopeFlags & SCOPE_ALL_VISIBLE;
 631         type->ty_Flags |= TF_ISINTERNAL;
 632 }
 633
 634 Type *
 635 AllocImportType(typelist_t *list, SemGroup *sg, int visibility)
 636 {
 637         Type *type = AllocType(list, TY_IMPORT);
 638
 639         type->ty_ImportType.et_SemGroup = sg;
 640         type->ty_Visibility = visibility;
 641         return(type);
 642 }
 643
 644 /*
 645  * adjtype must be moved to type's QList because type is being modified
 646  * such that that is where it is expected to be.
 647  */
 648 Type *
 649 TypeAdjustQList(Type *type, Type *adjtype)
 650 {
 651         if (adjtype) {
 652                 if (adjtype->ty_SQList)
 653                         RUNE_REMOVE(adjtype->ty_SQList, adjtype, ty_Node);
 654                 adjtype->ty_SQList = &type->ty_QList;
 655                 RUNE_INSERT_TAIL(adjtype->ty_SQList, adjtype, ty_Node);
 656         }
 657         return type;
 658 }
 659
 660 /*
 661  * Adjust the type to be locked storage.  Assumes that compound types
 662  * have not been cached/collapsed (parse-time only).
 663  */
 664 Type *
 665 TypeAdjustLockedStorage(Type *type)
 666 {
 667         SemGroup *sg;
 668         Declaration *d;
 669
 670         if (type->ty_Op != TY_COMPOUND)
 671                 return type;
 672
 673         /*
 674          * Assume no matching collapse yet
 675          */
 676         sg = type->ty_CompType.et_SemGroup;
 677         RUNE_FOREACH(d, &sg->sg_DeclList, d_Node) {
 678                 if (d->d_Op != DOP_GROUP_STORAGE)
 679                         continue;
 680                 d->d_ScopeFlags &= ~(SCOPE_UNLOCKED | SCOPE_MPSAFE);
 681         }
 682         return type;
 683 }
 684
 685 Type *
 686 TypeToQualType(Type *otype, Type *ntype, int sqFlags, Exp *exp)
 687 {
 688         SemGroup *sg;
 689
 690         /*
 691          * Combine with existing qualifiers, Shortcut if no changes made.
 692          */
 693         if (ntype == NULL &&
 694             sqFlags == otype->ty_SQFlags &&
 695             (exp == NULL || exp == otype->ty_AssExp)
 696         ) {
 697                 return(otype);
 698         }
 699
 700         /*
 701          * See if we already have a matching qualified type (only if storage
 702          * for the new type is not being provided).  Note: the provided storage
 703          * has already been initType()d
 704          */
 705         if (ntype == NULL) {
 706                 RUNE_FOREACH(ntype, otype->ty_SQList, ty_Node) {
 707                         if (ntype->ty_Op == otype->ty_Op &&
 708                             ntype->ty_SQFlags == sqFlags &&
 709                             (exp == NULL || ntype->ty_AssExp == exp)
 710                         ) {
 711                                 if (SameType(ntype, otype, sqFlags))
 712                                         return(ntype);
 713                         }
 714                 }
 715         }
 716
 717         /*
 718          * Build a new qualified type and set its qualifiers, then duplicate
 719          * appropriate sections of the old type.
 720          *
 721          * Default to the same SQList as otype.
 722          */
 723         if (ntype == NULL) {
 724                 ntype = AllocType(otype->ty_SQList, otype->ty_Op);
 725         } else {
 726                 if (ntype->ty_SQList)
 727                         RUNE_REMOVE(ntype->ty_SQList, ntype, ty_Node);
 728                 ntype->ty_SQList = otype->ty_SQList;
 729                 RUNE_INSERT_TAIL(ntype->ty_SQList, ntype, ty_Node);
 730         }
 731
 732         /*
 733          * Set the op and the expression.  Unlike SQFlags, if exp is passed as
 734          * NULL we inherit the old type's default.
 735          *
 736          * The DupExp() call here is special, see DupExp()'s handling of
 737          * ex_Decl.
 738          *
 739          * Normally DupExp() is called during resolution prior to ex_Decl
 740          * being set.  This is the one case where it may be called with
 741          * ex_Decl already set.
 742          *
 743          * WARNING! We do not try to resolve the type here.  Various resolve
 744          *          related flags in ty_Flags will be resolved later.  This
 745          *          includes TF_ISUNSIGNED and other TF_* flags.
 746          */
 747         ntype->ty_Op = otype->ty_Op;
 748         if (exp)
 749                 ntype->ty_AssExp = exp;
 750         else if (otype->ty_AssExp)
 751                 ntype->ty_AssExp = SetDupExp(NULL, otype->ty_AssExp);
 752         ntype->ty_SQFlags = sqFlags;
 753         ntype->ty_Visibility = otype->ty_Visibility;
 754
 755         switch(otype->ty_Op) {
 756         case TY_CLASS:
 757                 /*
 758                  * When updating the class, alternative forms are collapsed
 759                  * into it's SemGroup->sg_ClassList and not into some
 760                  * potentially long recursive chain based on ty_QList.
 761                  */
 762                 sg = otype->ty_ClassType.et_SemGroup;
 763
 764                 dassert(ntype->ty_SQList == &sg->sg_ClassList);
 765                 if (ntype->ty_ClassType.et_SemGroup != sg) {
 766                         ntype->ty_ClassType.et_SemGroup = sg;
 767                 }
 768                 ntype->ty_ClassType.et_Super = otype->ty_ClassType.et_Super;
 769                 break;
 770         case TY_IMPORT:
 771                 ntype->ty_Visibility = otype->ty_Visibility;
 772                 ntype->ty_ImportType.et_SemGroup = otype->ty_ImportType.et_SemGroup;
 773                 break;
 774         case TY_CPTRTO:
 775                 ntype->ty_CPtrType.et_Type = otype->ty_CPtrType.et_Type;
 776                 break;
 777         case TY_PTRTO:
 778                 ntype->ty_PtrType.et_Type = otype->ty_PtrType.et_Type;
 779                 break;
 780         case TY_REFTO:
 781                 ntype->ty_RefType.et_Type = otype->ty_RefType.et_Type;
 782                 break;
 783         case TY_ARYOF:
 784                 /*
 785                  * note: multiple type structures may share the same array size
 786                  * expression in simple qualified-type cases.  YYY XXX bad bad.
 787                  */
 788                 ntype->ty_AryType.et_Type = otype->ty_AryType.et_Type;
 789                 ntype->ty_AryType.et_ArySize = otype->ty_AryType.et_ArySize;
 790                 ntype->ty_AryType.et_SemGroup = otype->ty_AryType.et_SemGroup;
 791                 ntype->ty_AryType.et_Count = otype->ty_AryType.et_Count;
 792                 break;
 793         case TY_COMPOUND:
 794                 ntype->ty_CompType.et_SemGroup = otype->ty_CompType.et_SemGroup;
 795                 break;
 796         case TY_VAR:
 797                 ntype->ty_VarType.et_Type = otype->ty_VarType.et_Type;
 798                 ntype->ty_VarType.et_SemGroup = otype->ty_VarType.et_SemGroup;
 799                 break;
 800         case TY_ARGS:
 801                 ntype->ty_ArgsType.et_SemGroup = otype->ty_ArgsType.et_SemGroup;
 802                 break;
 803         case TY_PROC:
 804                 ntype->ty_ProcType.et_ArgsType = otype->ty_ProcType.et_ArgsType;
 805                 ntype->ty_ProcType.et_RetType = otype->ty_ProcType.et_RetType;
 806                 ntype->ty_ProcType.et_ArgCount = otype->ty_ProcType.et_ArgCount;
 807                 dassert(ntype->ty_SQList ==
 808                         &otype->ty_ProcType.et_RetType->ty_QList);
 809                 break;
 810         case TY_STORAGE:
 811                 ntype->ty_StorType.et_Bytes = otype->ty_StorType.et_Bytes;
 812                 break;
 813         case TY_DYNAMIC:
 814                 /*
 815                  * It is not legal to qualify a dynamic type other then to
 816                  * add or remove SF_LVALUE.
 817                  */
 818                 dpanic("Dynamic type cannot be qualified");
 819                 break;
 820         case TY_UNRESOLVED:
 821                 ntype->ty_UnresType.et_DottedId =
 822                         otype->ty_UnresType.et_DottedId;
 823                 ntype->ty_UnresType.et_SemGroup =
 824                         otype->ty_UnresType.et_SemGroup;
 825                 ntype->ty_UnresType.et_ImportSemGroup =
 826                         otype->ty_UnresType.et_ImportSemGroup;
 827                 break;
 828         default:
 829                 dassert_type(otype, 0);
 830         }
 831         return(ntype);
 832 }
 833
 834 /*
 835  * Convert a return-type + argument-type into a procedure type.  If
 836  * adjret is non-zero the return-type is converted to locked storage
 837  * (which is generally what we want).
 838  *
 839  * Match the procedure type(s) (after adjustment?)
 840  */
 841 Type *
 842 TypeToProcType(Type *rtype, Type *atype, int adjret)
 843 {
 844         Type *type;
 845         runesize_t count = 0;
 846         Declaration *d;
 847         SemGroup *sg;
 848
 849         dassert_type(atype, atype->ty_Op == TY_ARGS);
 850
 851         if (adjret)
 852                 rtype = TypeAdjustLockedStorage(rtype);
 853
 854         sg = atype->ty_CompType.et_SemGroup;
 855
 856         RUNE_FOREACH(d, &sg->sg_DeclList, d_Node) {
 857                 ++count;
 858         }
 859         RUNE_FOREACH(type, &rtype->ty_QList, ty_Node) {
 860                 if (type->ty_Op == TY_PROC) {
 861                         if (type->ty_ProcType.et_ArgsType == atype &&
 862                             type->ty_ProcType.et_RetType == rtype &&
 863                             type->ty_ProcType.et_ArgCount == count
 864                         ) {
 865                                 return(type);
 866                         }
 867                 }
 868         }
 869         type = AllocType(&rtype->ty_QList, TY_PROC);
 870         type->ty_ProcType.et_ArgsType = AllocArgsType(sg);
 871         type->ty_ProcType.et_RetType = rtype;
 872         type->ty_ProcType.et_ArgCount = count;
 873         return(type);
 874 }
 875
 876 /*
 877  * Convert type to pointer-to-type
 878  */
 879 Type *
 880 TypeToPtrType(Type *otype)
 881 {
 882         Type *type;
 883
 884         RUNE_FOREACH(type, &otype->ty_QList, ty_Node) {
 885                 if (type->ty_Op == TY_PTRTO)
 886                         return(type);
 887         }
 888         type = AllocType(&otype->ty_QList, TY_PTRTO);
 889         type->ty_PtrType.et_Type = otype;
 890         return(type);
 891 }
 892
 893 /*
 894  * Convert type to pointer-to-type
 895  */
 896 Type *
 897 TypeToCPtrType(Type *otype)
 898 {
 899         Type *type;
 900
 901         RUNE_FOREACH(type, &otype->ty_QList, ty_Node) {
 902                 if (type->ty_Op == TY_CPTRTO)
 903                         return(type);
 904         }
 905         type = AllocType(&otype->ty_QList, TY_CPTRTO);
 906         type->ty_CPtrType.et_Type = otype;
 907         return(type);
 908 }
 909
 910 /*
 911  * Convert type to ref-to-type
 912  *
 913  *      A reference type is similar to a pointer type except that the
 914  *      resolver is not able to entirely know what it is pointing to.
 915  *      The reference type is a superclass, but the actual type is
 916  *      stored in the run-time structure.
 917  */
 918 Type *
 919 TypeToRefType(Type *otype)
 920 {
 921         Type *type;
 922
 923         RUNE_FOREACH(type, &otype->ty_QList, ty_Node) {
 924                 if (type->ty_Op == TY_REFTO)
 925                         return(type);
 926         }
 927         type = AllocType(&otype->ty_QList, TY_REFTO);
 928         type->ty_RefType.et_Type = otype;
 929         return(type);
 930 }
 931
 932 Type *
 933 TypeToAryType(Type *otype, Exp *exp, SemGroup *sg)
 934 {
 935         Type *type;
 936
 937         /*
 938          * XXX handle constant expression optimization for QList
 939          * XXX handle qualifiers
 940          */
 941         type = AllocType(&otype->ty_QList, TY_ARYOF);
 942         type->ty_AryType.et_ArySize = exp;
 943         type->ty_AryType.et_Type = DelTypeQual(otype, SF_MASK_ARY_INHERIT);
 944         type->ty_AryType.et_SemGroup = sg;
 945         type->ty_SQFlags |= otype->ty_SQFlags & SF_MASK_ARY_INHERIT;
 946         return(type);
 947 }
 948
 949 #if 0
 950
 951 Type *
 952 TypeToRunTimeAryType(Type *otype, int count)
 953 {
 954         Type *type;
 955         Type *t2 = DelTypeQual(otype, SF_MASK_ARY_INHERIT);
 956
 957         RUNE_FOREACH(type, &otype->ty_QList, ty_Node) {
 958                 if (type->ty_Op == TY_ARYOF &&
 959                         type->ty_AryType.et_Type == t2 &&
 960                         type->ty_AryType.et_Count == count &&
 961                         type->ty_SQFlags ==
 962                          (otype->ty_SQFlags & SF_MASK_ARY_INHERIT)
 963                 ) {
 964                         return(type);
 965                 }
 966         }
 967         type = AllocType(&otype->ty_QList, TY_ARYOF);
 968         type->ty_AryType.et_Count = count;
 969         type->ty_AryType.et_Type = t2;
 970         type->ty_SQFlags |= otype->ty_SQFlags & SF_MASK_ARY_INHERIT;
 971         return(type);
 972 }
 973
 974 #endif
 975
 976 Type *
 977 TypeToVarType(Type *otype, SemGroup *sg)
 978 {
 979         Type *type;
 980
 981         /*dassert(sg->sg_Flags & SGF_RESOLVED);*/
 982         /*dassert(otype->ty_Flags & TF_RESOLVED);*/
 983
 984         RUNE_FOREACH(type, &otype->ty_QList, ty_Node) {
 985                 if (type->ty_Op == TY_VAR &&
 986                     type->ty_VarType.et_Type == otype &&
 987                     type->ty_VarType.et_SemGroup == sg
 988                 ) {
 989                         puts("SG2"); /* YYY */
 990                         return(type);
 991                 }
 992         }
 993         type = AllocType(&otype->ty_QList, TY_VAR);
 994         type->ty_VarType.et_Type = otype;
 995         type->ty_VarType.et_SemGroup = sg;
 996 #if 0
 997         /* XXX doesn't work for var-args */
 998         if (sg->sg_Flags & SGF_RESOLVED) {
 999                 type->ty_Flags |= TF_RESOLVED;
1000                 type->ty_Bytes = sg->sg_Bytes;
1001                 type->ty_AlignMask = sg->sg_AlignMask;
1002         }
1003 #endif
1004         return(type);
1005 }
1006
1007 /*
1008  * ChangeType() - given pointer, C pointer, or array of something,
1009  *                return 'op' of something instead.
1010  */
1011 Type *
1012 ChangeType(Type *type, int op)
1013 {
1014         switch(type->ty_Op) {
1015         case TY_PTRTO:
1016                 switch(op) {
1017                 case TY_CPTRTO:
1018                         type = TypeToCPtrType(type->ty_PtrType.et_Type);
1019                         break;
1020                 case TY_ARYOF:
1021                         type = TypeToAryType(type->ty_PtrType.et_Type,
1022                                              NULL, NULL);
1023                         break;
1024                 default:
1025                         dpanic("Illegal type convesion (A)");
1026                 }
1027                 break;
1028         case TY_CPTRTO:
1029                 switch(op) {
1030                 case TY_PTRTO:
1031                         type = TypeToPtrType(type->ty_CPtrType.et_Type);
1032                         break;
1033                 case TY_ARYOF:
1034                         type = TypeToAryType(type->ty_CPtrType.et_Type,
1035                                              NULL, NULL);
1036                         break;
1037                 default:
1038                         dpanic("Illegal type convesion (B)");
1039                 }
1040                 break;
1041         case TY_ARYOF:
1042                 switch(op) {
1043                 case TY_PTRTO:
1044                         type = TypeToPtrType(type->ty_AryType.et_Type);
1045                         break;
1046                 case TY_CPTRTO:
1047                         type = TypeToCPtrType(type->ty_AryType.et_Type);
1048                         break;
1049                 default:
1050                         dpanic("Illegal type convesion (C)");
1051                 }
1052                 break;
1053         default:
1054                 dpanic("Illegal type convesion (D)");
1055         }
1056         return(type);
1057 }
1058
1059 /*
1060  * BaseType() - return base type
1061  *
1062  *      Traverse the type to locate the base type.  Store the base type
1063  *      in *ptype and return the SemGroup, or return NULL if the base type
1064  *      does not have a SemGroup.
1065  */
1066 SemGroup *
1067 BaseType(Type **ptype)
1068 {
1069         Type *type = *ptype;
1070
1071         for (;;) {
1072                 switch(type->ty_Op) {
1073                 case TY_CPTRTO:
1074                         type = type->ty_CPtrType.et_Type;
1075                         continue;
1076                 case TY_PTRTO:
1077                         type = type->ty_PtrType.et_Type;
1078                         continue;
1079                 case TY_REFTO:
1080                         type = type->ty_RefType.et_Type;
1081                         continue;
1082                 case TY_ARYOF:
1083                         type = type->ty_AryType.et_Type;
1084                         continue;
1085                 }
1086                 break;
1087         }
1088
1089         *ptype = type;
1090
1091         switch(type->ty_Op) {
1092         case TY_CLASS:
1093                 return(type->ty_ClassType.et_SemGroup);
1094         case TY_COMPOUND:
1095                 return(type->ty_CompType.et_SemGroup);
1096         case TY_ARGS:
1097                 return(type->ty_ArgsType.et_SemGroup);
1098         case TY_PROC:
1099         case TY_VAR:
1100         case TY_DYNAMIC:
1101         case TY_STORAGE:
1102                 return(NULL);
1103         case TY_UNRESOLVED:
1104         default:
1105                 dassert_type(type, 0);
1106                 return(NULL);   /* avoid compiler complaints */
1107         }
1108 }
1109
1110 /*
1111  * DupType()     - create a duplicate of a type, possibly in a new SemGroup.
1112  *
1113  *      This code is used when duplicating procedures and other elements
1114  *      when merging a superclass into a subclass.
1115  *
1116  *      If sg is NULL, stype is simply returned.  The case is used when we
1117  *      try to duplciate an expression with DupExp()... in that case we
1118  *      want to dup the expression tree but use the same types.
1119  */
1120 Type *
1121 DupType(SemGroup *sg, Type *stype)
1122 {
1123         Type *type = NULL;
1124
1125         if (sg == NULL)
1126                 return(stype);
1127
1128         /*
1129          * XXX type may be resolved if it is part of a varargs dup
1130          */
1131 #if 0
1132         dassert_type(stype,
1133                      (stype->ty_Flags & (TF_RESOLVED|TF_RESOLVING)) == 0);
1134 #endif
1135
1136         switch(stype->ty_Op) {
1137         case TY_CLASS:
1138                 /*
1139                  * This only occurs because the resolver has resolved an
1140                  * unresolved type on the original SemGroup.  We duplicate
1141                  * that on the new SemGroup.
1142                  */
1143                 type = AllocClassType(&sg->sg_ClassList,
1144                                       stype->ty_ClassType.et_Super,
1145                                       stype->ty_ClassType.et_SemGroup,
1146                                       stype->ty_Visibility);
1147                 break;
1148         case TY_IMPORT:
1149         case TY_DYNAMIC:
1150                 type = stype;
1151                 break;
1152         case TY_CPTRTO:
1153                 type = TypeToCPtrType(DupType(sg, stype->ty_CPtrType.et_Type));
1154                 break;
1155         case TY_PTRTO:
1156                 type = TypeToPtrType(DupType(sg, stype->ty_PtrType.et_Type));
1157                 break;
1158         case TY_REFTO:
1159                 type = TypeToRefType(DupType(sg, stype->ty_RefType.et_Type));
1160                 break;
1161         case TY_ARYOF:
1162                 type = TypeToAryType(DupType(sg, stype->ty_AryType.et_Type),
1163                                 SetDupExp(sg, stype->ty_AryType.et_ArySize),
1164                                 stype->ty_AryType.et_SemGroup);
1165                 type->ty_AryType.et_Count = stype->ty_AryType.et_Count;
1166                 break;
1167         case TY_VAR:
1168                 type = TypeToVarType(DupType(sg, stype->ty_VarType.et_Type),
1169                                 DupSemGroup(sg, NULL,
1170                                             stype->ty_VarType.et_SemGroup, 1));
1171                 break;
1172         case TY_COMPOUND:
1173                 type = AllocCompoundType(
1174                                 DupSemGroup(sg, NULL,
1175                                             stype->ty_CompType.et_SemGroup, 1));
1176                 break;
1177         case TY_ARGS:
1178                 /*
1179                  * At the moment we always formally duplicate the arguments
1180                  * so we can modify them for methods below.
1181                  */
1182                 type = AllocArgsType(
1183                                 DupSemGroup(sg, NULL,
1184                                             stype->ty_CompType.et_SemGroup, 1));
1185                 break;
1186         case TY_PROC:
1187                 type = DupType(sg, stype->ty_ProcType.et_RetType);
1188                 type = TypeToProcType(type,
1189                                   DupType(sg, stype->ty_ProcType.et_ArgsType),
1190                                       1);
1191
1192                 /*
1193                  * If this is a method procedure, we have to change the
1194                  * first argument to point at our new subclass.  It was
1195                  * previously pointing at our superclass.   XXX the
1196                  * programmer can override the argument.  If it isn't a
1197                  * reference we have to assert.
1198                  */
1199                 if (sg->sg_Stmt->st_Op != ST_Class) {
1200                         /*
1201                          * XXX probably an inlined procedure, the type is
1202                          *     already correct.  Need an assertrion here.
1203                          */
1204                 } else if (stype->ty_SQFlags & SF_METHOD) {
1205                         SemGroup *asg = type->ty_ProcType.et_ArgsType->ty_ArgsType.et_SemGroup;
1206                         Declaration *d = RUNE_FIRST(&asg->sg_DeclList);
1207                         Type *thisType = d->d_StorDecl.ed_Type;
1208
1209                         dassert_decl(d, d->d_Id == String_This &&
1210                                         d->d_Op == DOP_ARGS_STORAGE);
1211                         dassert_decl(d, sg->sg_Stmt->st_Op == ST_Class);
1212                         if (thisType->ty_Op == TY_CLASS) {
1213                                 /* XXX sg_ClassList? right sg? */
1214                                 /* XXX correct visibility? */
1215                                 if (d->d_Search == NULL) {
1216                                         d->d_Search = d->d_StorDecl.ed_Type->
1217                                                       ty_ClassType.et_SemGroup;
1218                                 }
1219                                 d->d_StorDecl.ed_Type =
1220                                         AllocClassType(&sg->sg_ClassList,
1221                                                        sg->sg_Stmt->st_ClassStmt.es_Super,
1222                                                        sg->sg_Stmt->st_MyGroup,
1223                                                        SCOPE_ALL_VISIBLE);
1224                         } else {
1225                                 dassert_decl(d, thisType->ty_Op == TY_REFTO);
1226                         }
1227                 } else if (stype->ty_SQFlags & SF_GMETHOD) {
1228                         SemGroup *asg;
1229                         Declaration *d;
1230
1231                         asg = type->ty_ProcType.et_ArgsType->
1232                                 ty_ArgsType.et_SemGroup;
1233                         d = RUNE_FIRST(&asg->sg_DeclList);
1234
1235                         dassert_decl(d, d->d_Id == String_This &&
1236                                      d->d_Op == DOP_TYPEDEF);
1237                         dassert_decl(d, sg->sg_Stmt->st_Op == ST_Class);
1238                         dassert_decl(d, d->d_TypedefDecl.ed_Type->ty_Op ==
1239                                         TY_CLASS);
1240                         /* XXX sg_ClassList? right sg? */
1241                         /* XXX correct visibility? */
1242                         if (d->d_Search == NULL) {
1243                                 d->d_Search = d->d_TypedefDecl.ed_Type->
1244                                                ty_ClassType.et_SemGroup;
1245                         }
1246                         d->d_TypedefDecl.ed_Type =
1247                                 AllocClassType(&sg->sg_ClassList,
1248                                                sg->sg_Stmt->st_ClassStmt.es_Super,
1249                                                sg->sg_Stmt->st_MyGroup,
1250                                                SCOPE_ALL_VISIBLE);
1251                 }
1252                 break;
1253         case TY_STORAGE:
1254                 type = stype;
1255                 break;
1256         case TY_UNRESOLVED:
1257                 /*
1258                  * e.g. so elements in a superclass will see refined elements
1259                  * in the subclass.  Note that the original import semgroup
1260                  * is left intact so the semantic search mechanism uses it
1261                  * when the base sg (typically a subclass) fails.
1262                  */
1263                 type = AllocUnresolvedType(
1264                                 stype->ty_UnresType.et_ImportSemGroup,
1265                                 sg,
1266                                 stype->ty_UnresType.et_DottedId,
1267                                 0);
1268                 break;
1269         default:
1270                 dassert_type(stype, 0);
1271         }
1272
1273         if (type != stype) {
1274                 type->ty_Flags = stype->ty_Flags &
1275                                  ~(TF_ISINTERNAL | TF_RESOLVING | TF_RESOLVED |
1276                                    TF_ALIGNRESOLVED | TF_TMPRESOLVED);
1277                 type->ty_Bytes = stype->ty_Bytes;
1278                 type->ty_AlignMask = stype->ty_AlignMask;
1279                 type->ty_Visibility = stype->ty_Visibility;
1280                 type->ty_DynamicVector = stype->ty_DynamicVector;
1281         }
1282         if (stype->ty_AssExp || stype->ty_SQFlags != type->ty_SQFlags) {
1283                 type = TypeToQualType(type, NULL,
1284                                       stype->ty_SQFlags,
1285                                       SetDupExp(sg, stype->ty_AssExp));
1286         }
1287
1288         return(type);
1289 }
1290
1291 typereglist_t TypeRegList = RUNE_HEAD_INITIALIZER(TypeRegList);
1292
1293 void
1294 InternalRegisterType(const char *str, const char *linkname, Type *type)
1295 {
1296         static int Special = SPECIALF_REGISTERED|SPECIALF_INTERNAL|1;
1297         TypeRegNode *tr;
1298
1299         dassert(Special & SPECIALF_MASK);
1300         tr = zalloc(sizeof(TypeRegNode));
1301         tr->tr_Id = StrTableAlloc(str, strlen(str), Special++);
1302         tr->tr_Type = type;
1303         tr->tr_LinkName = linkname;
1304         RUNE_INSERT_TAIL(&TypeRegList, tr, tr_Node);
1305 }
1306
1307 Type *
1308 InternalRegisteredTypeLookup(string_t id)
1309 {
1310         TypeRegNode *tr;
1311
1312         RUNE_FOREACH(tr, &TypeRegList, tr_Node) {
1313                 if (tr->tr_Id == id)
1314                         return(tr->tr_Type);
1315         }
1316         return(NULL);
1317 }