MWCC/compiler_and_linker/unsorted/CClass.c

#include "compiler/CClass.h"
#include "compiler/CABI.h"
#include "compiler/CDecl.h"
#include "compiler/CError.h"
#include "compiler/CExpr.h"
#include "compiler/CInit.h"
#include "compiler/CInline.h"
#include "compiler/CMachine.h"
#include "compiler/CMangler.h"
#include "compiler/CObjC.h"
#include "compiler/CParser.h"
#include "compiler/CRTTI.h"
#include "compiler/CSOM.h"
#include "compiler/CompilerTools.h"
#include "compiler/CodeGen.h"
#include "compiler/objects.h"
#include "compiler/scopes.h"

#ifdef __MWERKS__
#pragma options align=mac68k
#endif
typedef struct OVClassBase {
    struct OVClassBase *next;
    struct OVClass *ovclass;
    Boolean is_virtual;
} OVClassBase;

typedef struct OVFunc {
    struct OVFunc *next;
    Object *obj;
    struct OVClass *ovc8;
    struct OVFunc *ovfC;
    struct OVFunc *ovf10;
} OVFunc;

typedef struct OVClass {
    TypeClass *tclass;
    OVFunc *vfuncs;
    OVClassBase *bases;
    SInt32 offset;
    SInt32 voffset;
    Boolean alloced_vtable;
} OVClass;

typedef struct ThunkList {
    struct ThunkList *next;
    Object *thunkobj;
    Object *obj;
    SInt32 a;
    SInt32 b;
    SInt32 c;
} ThunkList;
#ifdef __MWERKS__
#pragma options align=reset
#endif

static TypeClass *main_class;
static ThunkList *cclass_thunklist;
static TypeClass *cclass_isbase_mostderived;
static SInt32 cclass_isbase_foundoffset;
static Boolean cclass_isambigbase;
static short cclass_founddepth;
static char *vtable_object_data;
static SInt32 vtable_data_size;
static OLinkList *vtable_object_links;
static TypeClass *cclass_vbase;
static OVClass *cclass_ovbase;
static OVClass *cclass_root;
static Object *found_pure;
static Boolean check_pures;
static Object *cclass_dominator_vobject;
static SInt32 cclass_dominator_voffset;
static Object *cclass_dominator_oobject;
static TypeClass *cclass_dominator_oclass;
static SInt32 cclass_dominator_ooffset;
static Object *cclass_dominator_eobject;

void CClass_Init(void) {
    cclass_thunklist = NULL;
}

void CClass_GenThunks(void) {
    ThunkList *list;

    for (list = cclass_thunklist; list; list = list->next) {
        list->thunkobj->flags |= OBJECT_FLAGS_4;
        CodeGen_GenVDispatchThunk(list->thunkobj, list->obj, list->a, list->b, list->c);
    }
}

static Object *CClass_ThunkObject(Object *obj, SInt32 a, SInt32 b, SInt32 c) {
    Object *thunkobj;
    ThunkList *list;

    CInline_ObjectAddrRef(obj);
    for (list = cclass_thunklist; list; list = list->next) {
        if (obj == list->obj && a == list->a && b == list->b && c == list->c)
            return list->thunkobj;
    }

    thunkobj = CParser_NewCompilerDefFunctionObject();
    thunkobj->name = CMangler_ThunkName(obj, a, b, c);
    thunkobj->type = TYPE(&rt_func);
    thunkobj->sclass = TK_EXTERN;
    thunkobj->qual = Q_20000;
    thunkobj->u.func.linkname = thunkobj->name;

    list = galloc(sizeof(ThunkList));
    list->thunkobj = thunkobj;
    list->obj = obj;
    list->a = a;
    list->b = b;
    list->c = c;
    list->next = cclass_thunklist;
    cclass_thunklist = list;

    return thunkobj;
}

static Boolean CClass_IsZeroOffsetClass(TypeClass *a, TypeClass *b) {
    while (1) {
        if (a == b)
            return 1;

        if (!a->bases || a->bases->is_virtual)
            return 0;

        a = a->bases->base;
    }
}

static UInt8 CClass_IsCovariantResult(Type *a, UInt32 qualA, Type *b, UInt32 qualB, Boolean errorflag) {
    TypeClass *tclassA;
    TypeClass *tclassB;

    if (
        IS_TYPE_POINTER_ONLY(a) &&
        IS_TYPE_POINTER_ONLY(b) &&
        TPTR_QUAL(a) == TPTR_QUAL(b) &&
        !CParser_IsMoreCVQualified(qualB, qualA) &&
        IS_TYPE_CLASS(TPTR_TARGET(a)) &&
        IS_TYPE_CLASS(TPTR_TARGET(b))
        )
    {
        tclassA = TYPE_CLASS(TPTR_TARGET(a));
        tclassB = TYPE_CLASS(TPTR_TARGET(b));
        if (tclassA == tclassB || CClass_IsBaseClass(tclassB, tclassA, NULL, errorflag, errorflag)) {
            if (!CClass_IsZeroOffsetClass(tclassB, tclassA))
                return 2;
            else
                return 1;
        }
    }

    return 0;
}

UInt8 CClass_GetOverrideKind(TypeFunc *a, TypeFunc *b, Boolean errorflag) {
    if (!a->args || !b->args)
        return 0;

    if (
        (a->flags & (FUNC_FLAGS_PASCAL | FUNC_FLAGS_F0000000)) != (b->flags & (FUNC_FLAGS_PASCAL | FUNC_FLAGS_F0000000)) ||
        !is_arglistsame(a->args->next, b->args->next) ||
        a->args->qual != b->args->qual
        )
        return 0;

    if (!is_typesame(a->functype, b->functype)) {
        switch (CClass_IsCovariantResult(a->functype, a->qual, b->functype, b->qual, errorflag)) {
            case 0:
                if (errorflag)
                    CError_Error(CErrorStr227);
                return 0;
            case 1:
                return 1;
            case 2:
                return 2;
            default:
                CError_FATAL(225);
        }
    }

    return 1;
}

Boolean CClass_IsEmpty(TypeClass *tclass) {
    ClassList *base;

    if (tclass->ivars)
        return 0;

    for (base = tclass->bases; base; base = base->next) {
        if (!CClass_IsEmpty(base->base))
            return 0;
    }

    return 1;
}

Boolean CClass_IsNonStaticMemberFunc(TypeFunc *tfunc) {
    return IS_TYPEFUNC_NONSTATIC_METHOD(tfunc) || (tfunc->flags & FUNC_FLAGS_80);
}

Object *CClass_DefaultConstructor(TypeClass *tclass) {
    NameSpaceObjectList *nsol;
    Object *object;

    for (nsol = CScope_FindName(tclass->nspace, constructor_name_node); nsol; nsol = nsol->next) {
        object = OBJECT(nsol->object);
        if (object->otype == OT_OBJECT && IS_TYPE_FUNC(object->type)) {
            if ((tclass->flags & CLASS_FLAGS_20) && !tclass->sominfo) {
                if (TYPE_FUNC(object->type)->args->next && !TYPE_FUNC(object->type)->args->next->next)
                    return object;
            } else {
                if (!TYPE_FUNC(object->type)->args->next)
                    return object;
            }
        }
    }

    return NULL;
}

Object *CClass_DummyDefaultConstructor(TypeClass *tclass) {
    Object *ctor;
    FuncArg *args;
    NameSpaceObjectList *nsol;
    HashNameNode *name;
    TypeMemberFunc *tmethod;
    Object *object;
    ObjectList list;

    ctor = NULL;

    for (nsol = CScope_FindName(tclass->nspace, constructor_name_node); nsol; nsol = nsol->next) {
        object = OBJECT(nsol->object);
        if (object->otype == OT_OBJECT && IS_TYPE_FUNC(object->type)) {
            CError_ASSERT(305, args = TYPE_FUNC(object->type)->args);
            args = args->next;
            if ((tclass->flags & CLASS_FLAGS_20) && !tclass->sominfo) {
                CError_ASSERT(309, args);
                args = args->next;
            }
            CError_ASSERT(312, args);

            if (args->dexpr) {
                if (ctor) {
                    list.next = NULL;
                    list.object = object;
                    CError_OverloadedFunctionError(ctor, &list);
                    break;
                }
                ctor = object;
            }
        }
    }

    if (!ctor) {
        CError_Error(CErrorStr203);
        return NULL;
    }

    name = GetHashNameNodeExport("__defctor");
    if ((nsol = CScope_FindName(tclass->nspace, name))) {
        CError_ASSERT(339, nsol->object->otype == OT_OBJECT && IS_TYPE_FUNC(OBJECT(nsol->object)->type));
        return OBJECT(nsol->object);
    }

    tmethod = galloc(sizeof(TypeMemberFunc));
    memclrw(tmethod, sizeof(TypeMemberFunc));

    tmethod->type = TYPEFUNC;
    tmethod->functype = TYPE(&void_ptr);
    tmethod->flags = FUNC_FLAGS_METHOD;
    tmethod->theclass = tclass;
    CDecl_SetFuncFlags(TYPE_FUNC(tmethod), 0);

    if ((tclass->flags & CLASS_FLAGS_20) && !tclass->sominfo)
        CDecl_AddArgument(TYPE_FUNC(tmethod), TYPE(&stsignedshort));

    CDecl_AddThisPointerArgument(TYPE_FUNC(tmethod), tclass);

    object = CParser_NewCompilerDefFunctionObject();
    object->type = TYPE(tmethod);
    object->qual = Q_INLINE | Q_80000;
    object->nspace = tclass->nspace;
    object->name = name;

    CScope_AddObject(tclass->nspace, name, OBJ_BASE(object));
    CParser_RegisterDummyCtorFunction(object, ctor);
    return object;
}

ENode *CClass_DefaultConstructorCall(TypeClass *tclass, TypeClass *b, ENode *objexpr, SInt32 varg, Boolean flag1, Boolean flag2, Boolean *errorflag) {
    NameSpaceObjectList *nsol;
    Object *ctor;
    Object *object;
    FuncArg *args;
    ENodeList *argexprs;
    ENode *expr;
    BClassList *path;
    BClassList list1;
    ObjectList objlist;
    BClassList list2;
    short founddepth;
    Boolean isambigbase;

    *errorflag = 0;

    if (!(nsol = CScope_FindName(tclass->nspace, constructor_name_node)))
        return NULL;

    ctor = NULL;
    do {
        object = OBJECT(nsol->object);
        if (object->otype == OT_OBJECT && IS_TYPE_FUNC(object->type)) {
            CError_ASSERT(397, args = TYPE_FUNC(object->type)->args);

            args = args->next;

            if ((tclass->flags & CLASS_FLAGS_20) && !tclass->sominfo) {
                CError_ASSERT(401, args);
                args = args->next;
            }

            if (!args || args->dexpr) {
                if (ctor) {
                    objlist.next = NULL;
                    objlist.object = object;
                    CError_OverloadedFunctionError(ctor, &objlist);
                    break;
                }
                ctor = object;
            }
        }
    } while ((nsol = nsol->next));

    if (!ctor) {
        *errorflag = 1;
        return NULL;
    }

    if (flag1) {
        if (b) {
            if (flag2) {
                if ((path = CClass_GetBasePath(b, tclass, &founddepth, &isambigbase)))
                    list1 = *path;
                else
                    goto skipCheck;
            } else {
                list1.next = &list2;
                list1.type = TYPE(b);
                list2.next = NULL;
                list2.type = TYPE(tclass);
            }
        } else {
            list1.next = NULL;
            list1.type = TYPE(tclass);
        }
        CClass_CheckPathAccess(&list1, ctor, ctor->access);
    }

skipCheck:
    if ((tclass->flags & CLASS_FLAGS_20) && !tclass->sominfo) {
        argexprs = lalloc(sizeof(ENodeList));
        argexprs->next = NULL;
        argexprs->node = intconstnode(TYPE(&stsignedshort), varg);
    } else {
        argexprs = NULL;
    }

    CError_ASSERT(471, IS_TYPE_POINTER_ONLY(objexpr->rtype));

    objexpr = makemonadicnode(objexpr, EINDIRECT);
    objexpr->rtype = TYPE(tclass);

    list1.next = NULL;
    list1.type = TYPE(tclass);

    expr = CExpr_GenericFuncCall(
        &list1,
        objexpr,
        0,
        ctor,
        NULL,
        NULL,
        argexprs,
        0,
        0,
        0
        );

    if (ENODE_IS2(expr, EFUNCCALL, EFUNCCALLP))
        expr->rtype = CDecl_NewPointerType(TYPE(tclass));

    return expr;
}

Object *CClass_AssignmentOperator(TypeClass *tclass) {
    NameSpaceObjectList *nsol;
    Object *object;

    for (nsol = CScope_FindName(tclass->nspace, asop_name_node); nsol; nsol = nsol->next) {
        object = OBJECT(nsol->object);
        if (
            object->otype == OT_OBJECT &&
            IS_TYPE_FUNC(object->type) &&
            TYPE_FUNC(object->type)->args &&
            TYPE_FUNC(object->type)->args->next &&
            !TYPE_FUNC(object->type)->args->next->next
            )
        {
            if (
                IS_TYPE_CLASS(TYPE_FUNC(object->type)->args->next->type) &&
                TYPE_CLASS(TYPE_FUNC(object->type)->args->next->type) == tclass
                )
                return object;

            if (
                IS_TYPE_REFERENCE(TYPE_FUNC(object->type)->args->next->type) &&
                TPTR_TARGET(TYPE_FUNC(object->type)->args->next->type) == TYPE(tclass)
                )
                return object;
        }
    }

    return NULL;
}

Object *CClass_CopyConstructor(TypeClass *tclass) {
    NameSpaceObjectList *nsol;
    Object *object;
    FuncArg *args;

    if (tclass->sominfo)
        return NULL;

    for (nsol = CScope_FindName(tclass->nspace, constructor_name_node); nsol; nsol = nsol->next) {
        object = OBJECT(nsol->object);
        if (object->otype == OT_OBJECT && IS_TYPE_FUNC(object->type)) {
            CError_ASSERT(532, args = TYPE_FUNC(object->type)->args);

            args = args->next;

            if (tclass->flags & CLASS_FLAGS_20) {
                CError_ASSERT(536, args);
                args = args->next;
            }

            if (
                args &&
                args != &elipsis &&
                (!args->next || args->next->dexpr) &&
                IS_TYPE_REFERENCE(args->type) &&
                TPTR_TARGET(args->type) == TYPE(tclass)
                )
                return object;
        }
    }

    return NULL;
}

NameSpaceObjectList *CClass_MemberObject(TypeClass *tclass, HashNameNode *name) {
    NameSpaceObjectList *nsol;

    if ((nsol = CScope_FindName(tclass->nspace, name)) && nsol->object->otype == OT_OBJECT)
        return nsol;

    return NULL;
}

NameSpaceObjectList *CClass_Constructor(TypeClass *tclass) {
    NameSpaceObjectList *nsol;

    if (
        (nsol = CScope_FindName(tclass->nspace, constructor_name_node)) &&
        nsol->object->otype == OT_OBJECT &&
        IS_TYPE_FUNC(OBJECT(nsol->object)->type)
        )
        return nsol;

    return NULL;
}

Object *CClass_Destructor(TypeClass *tclass) {
    NameSpaceObjectList *nsol;

    for (nsol = CScope_FindName(tclass->nspace, destructor_name_node); nsol; nsol = nsol->next) {
        if (
            nsol->object->otype == OT_OBJECT &&
            IS_TYPE_FUNC(OBJECT(nsol->object)->type)
            )
            return OBJECT(nsol->object);
    }

    return NULL;
}

Boolean CClass_IsConstructor(Object *obj) {
    return obj && IS_TYPE_FUNC(obj->type) && (TYPE_FUNC(obj->type)->flags & FUNC_FLAGS_1000);
}

Boolean CClass_IsDestructor(Object *obj) {
    return obj && IS_TYPE_FUNC(obj->type) && (TYPE_FUNC(obj->type)->flags & FUNC_FLAGS_2000);
}

Boolean CClass_IsPODClass(TypeClass *tclass) {
    NameSpaceObjectList *nsol;
    Object *object;
    ObjMemberVar *ivar;
    Type *type;

    if (tclass->vtable || tclass->bases || CClass_Destructor(tclass))
        return 0;

    for (nsol = CClass_Constructor(tclass); nsol; nsol = nsol->next) {
        if (
            nsol->object->otype == OT_OBJECT &&
            IS_TYPE_FUNC(OBJECT(nsol->object)->type) &&
            !(TYPE_FUNC(OBJECT(nsol->object)->type)->flags & FUNC_FLAGS_100)
            )
            return 0;
    }

    object = CClass_AssignmentOperator(tclass);
    if (object && !(TYPE_FUNC(object->type)->flags & FUNC_FLAGS_100))
        return 0;

    for (ivar = tclass->ivars; ivar; ivar = ivar->next) {
        if (ivar->access != ACCESSPUBLIC)
            return 0;

        type = ivar->type;
        while (IS_TYPE_ARRAY(type))
            type = TPTR_TARGET(type);

        switch (type->type) {
            case TYPECLASS:
                if (!CClass_IsPODClass(TYPE_CLASS(type)))
                    return 0;
                break;
            case TYPEMEMBERPOINTER:
                return 0;
            case TYPEPOINTER:
                if (TPTR_QUAL(type) & Q_REFERENCE)
                    return 0;
                break;
        }
    }

    return 1;
}

Boolean CClass_IsTrivialCopyClass(TypeClass *tclass) {
    Object *object;
    ClassList *base;
    ObjMemberVar *ivar;
    Type *type;

    if (tclass->vtable || tclass->vbases || CClass_Destructor(tclass))
        return 0;

    object = CClass_CopyConstructor(tclass);
    if (object && IS_TYPE_FUNC(object->type) && !(TYPE_FUNC(object->type)->flags & FUNC_FLAGS_100))
        return 0;

    for (base = tclass->bases; base; base = base->next) {
        if (!CClass_IsTrivialCopyClass(base->base))
            return 0;
    }

    for (ivar = tclass->ivars; ivar; ivar = ivar->next) {
        type = ivar->type;
        while (IS_TYPE_ARRAY(type))
            type = TPTR_TARGET(type);

        if (IS_TYPE_CLASS(type) && !CClass_IsTrivialCopyClass(TYPE_CLASS(type)))
            return 0;
    }

    return 1;
}

Boolean CClass_IsTrivialCopyAssignClass(TypeClass *tclass) {
    Object *object;
    ObjMemberVar *ivar;
    Type *type;

    if (tclass->vtable || tclass->bases || CClass_Destructor(tclass))
        return 0;

    object = CClass_AssignmentOperator(tclass);
    if (object && !(TYPE_FUNC(object->type)->flags & FUNC_FLAGS_100))
        return 0;

    for (ivar = tclass->ivars; ivar; ivar = ivar->next) {
        type = ivar->type;
        while (IS_TYPE_ARRAY(type))
            type = TPTR_TARGET(type);

        if (IS_TYPE_REFERENCE(type))
            return 0;
        if (CParser_IsConst(type, ivar->qual))
            return 0;
        if (IS_TYPE_CLASS(type) && !CClass_IsTrivialCopyAssignClass(TYPE_CLASS(type)))
            return 0;
    }

    return 1;
}

Boolean CClass_ReferenceArgument(TypeClass *tclass) {
    if ((tclass->flags & (CLASS_FLAGS_2 | CLASS_FLAGS_800)) == CLASS_FLAGS_800)
        CDecl_CompleteType(TYPE(tclass));

    if (copts.simple_class_byval)
        return !CClass_IsTrivialCopyClass(tclass);

    return CClass_Destructor(tclass) || CClass_CopyConstructor(tclass);
}

BClassList *CClass_GetPathCopy(BClassList *path, Boolean is_global) {
    BClassList *last;
    BClassList *copy;

    if (!path)
        return NULL;

    copy = last = is_global ? galloc(sizeof(BClassList)) : lalloc(sizeof(BClassList));
    last->next = path->next;
    last->type = path->type;

    while ((path = path->next)) {
        last->next = is_global ? galloc(sizeof(BClassList)) : lalloc(sizeof(BClassList));
        last = last->next;
        last->next = path->next;
        last->type = path->type;
    }

    return copy;
}

BClassList *CClass_AppendPath(BClassList *dest, BClassList *src) {
    BClassList *last;

    if (!(last = dest))
        return src;

    while (last->next)
        last = last->next;

    while (src && src->type == last->type)
        src = src->next;

    last->next = src;
    return dest;
}

static AccessType CClass_GetPathAccess(BClassList *path) {
    AccessType result;
    ClassList *base;
    TypeClass *tclass;

    CError_ASSERT(930, path);

    result = ACCESSPUBLIC;

    while (1) {
        tclass = TYPE_CLASS(path->type);
        if (!(path = path->next))
            break;

        for (base = tclass->bases; base; base = base->next) {
            if (base->base == TYPE_CLASS(path->type))
                break;
        }

        CError_ASSERT(939, base);

        switch (base->access) {
            case ACCESSPUBLIC:
                break;
            case ACCESSPROTECTED:
                if (result == ACCESSPUBLIC)
                    result = ACCESSPROTECTED;
                break;
            case ACCESSPRIVATE:
                if (result == ACCESSPUBLIC || result == ACCESSPROTECTED)
                    result = ACCESSPRIVATE;
                else
                    return ACCESSNONE;
                break;
            case ACCESSNONE:
                return ACCESSNONE;
            default:
                CError_FATAL(960);
        }
    }

    return result;
}

Boolean CClass_IsMoreAccessiblePath(BClassList *path1, BClassList *path2) {
    switch (CClass_GetPathAccess(path2)) {
        case ACCESSPUBLIC:
            return 0;
        case ACCESSNONE:
            return 1;
        default:
            CError_FATAL(978);
        case ACCESSPROTECTED:
            switch (CClass_GetPathAccess(path1)) {
                case ACCESSPUBLIC:
                    return 1;
                case ACCESSPRIVATE:
                case ACCESSPROTECTED:
                case ACCESSNONE:
                    return 0;
                default:
                    CError_FATAL(987);
            }
        case ACCESSPRIVATE:
            switch (CClass_GetPathAccess(path1)) {
                case ACCESSPUBLIC:
                case ACCESSPROTECTED:
                    return 1;
                case ACCESSPRIVATE:
                case ACCESSNONE:
                    return 0;
                default:
                    CError_FATAL(997);
            }
    }

    return 0;
}

static BClassList *CClass_GetBasePathRec(TypeClass *a, TypeClass *b, SInt32 offset, short depth) {
    ClassList *base;
    BClassList *checkpath;
    BClassList *bestpath;
    BClassList *newpath;
    SInt32 newOffset;

    for (base = a->bases, bestpath = NULL; base; base = base->next) {
        if (base->is_virtual)
            newOffset = CClass_VirtualBaseOffset(cclass_isbase_mostderived, base->base);
        else
            newOffset = offset + base->offset;

        if (base->base == b) {
            if (cclass_founddepth && newOffset != cclass_isbase_foundoffset) {
                cclass_isambigbase = 1;
                return NULL;
            }

            cclass_isbase_foundoffset = newOffset;
            cclass_founddepth = depth;

            bestpath = lalloc(sizeof(BClassList));
            bestpath->next = NULL;
            bestpath->type = TYPE(b);
        } else if ((checkpath = CClass_GetBasePathRec(base->base, b, newOffset, depth + 1))) {
            newpath = lalloc(sizeof(BClassList));
            newpath->next = checkpath;
            newpath->type = TYPE(base->base);
            if (!bestpath || CClass_IsMoreAccessiblePath(newpath, bestpath))
                bestpath = newpath;
        }
    }

    return bestpath;
}

BClassList *CClass_GetBasePath(TypeClass *a, TypeClass *b, short *founddepth, Boolean *isambigbase) {
    BClassList *path;
    BClassList *result;

    if ((a->flags & (CLASS_FLAGS_2 | CLASS_FLAGS_800)) == CLASS_FLAGS_800)
        CDecl_CompleteType(TYPE(a));
    if ((b->flags & (CLASS_FLAGS_2 | CLASS_FLAGS_800)) == CLASS_FLAGS_800)
        CDecl_CompleteType(TYPE(b));

    cclass_founddepth = 0;
    cclass_isbase_mostderived = a;
    cclass_isbase_foundoffset = -1;
    cclass_isambigbase = 0;

    if ((path = CClass_GetBasePathRec(a, b, 0, 1))) {
        *founddepth = cclass_founddepth;
        *isambigbase = cclass_isambigbase;

        result = lalloc(sizeof(BClassList));
        result->next = path;
        result->type = TYPE(a);
        return result;
    } else {
        *isambigbase = 0;
        return NULL;
    }
}

Boolean CClass_IsBaseClass(TypeClass *a, TypeClass *b, short *founddepth, Boolean pathcheckflag, Boolean ambigerrorflag) {
    BClassList *path;
    short depth;
    Boolean isambigbase;

    if ((path = CClass_GetBasePath(a, b, &depth, &isambigbase))) {
        if (isambigbase && ambigerrorflag)
            CError_Error(CErrorStr188);

        if (pathcheckflag)
            CClass_CheckPathAccess(path, NULL, ACCESSPUBLIC);

        if (founddepth)
            *founddepth = depth;

        return 1;
    }

    return 0;
}

TypeClass *CClass_GetQualifiedClass(void) {
    DeclInfo di;

    memclrw(&di, sizeof(di));
    CParser_GetDeclSpecs(&di, 0);

    if (IS_TYPE_CLASS(di.thetype))
        return TYPE_CLASS(di.thetype);

    return NULL;
}

ENode *CClass_AccessPathCast(BClassList *path, ENode *expr, Boolean reverse) {
    ClassList *base;
    SInt32 offset;

    while (path && path->next) {
        base = TYPE_CLASS(path->type)->bases;
        while (1) {
            if (base->base == TYPE_CLASS(path->next->type))
                break;
            CError_ASSERT(1157, base = base->next);
        }

        if (base->is_virtual) {
            if (reverse) {
                CError_Error(CErrorStr164);
                break;
            }

            if (!base->base->sominfo) {
                offset = base->offset;
                if (offset && !canadd(expr, offset)) {
                    expr = makediadicnode(expr, intconstnode(TYPE(&stunsignedlong), offset), EADD);
                    optimizecomm(expr);
                }

                expr->rtype = CDecl_NewPointerType(CDecl_NewPointerType(TYPE(base->base)));
                expr = makemonadicnode(expr, EINDIRECT);
                expr->rtype = expr->data.monadic->rtype;
            }
        } else {
            offset = base->offset;
            if (offset) {
                if (reverse)
                    offset = -offset;
                if (!canadd(expr, offset)) {
                    expr = makediadicnode(expr, intconstnode(TYPE(&stunsignedlong), offset), EADD);
                    optimizecomm(expr);
                }
            }
        }

        path = path->next;
    }

    return expr;
}

ENode *CClass_ClassPointerCast(ENode *expr, TypeClass *a, TypeClass *b, Boolean typconflag, Boolean ambigerrorflag, Boolean pathcheckflag) {
    BClassList *path;
    Boolean reverse;
    short depth;
    Boolean isambigbase;

    reverse = 0;

    if (a != b) {
        if (!(path = CClass_GetBasePath(a, b, &depth, &isambigbase))) {
            CError_ASSERT(1216, typconflag);
            if ((path = CClass_GetBasePath(b, a, &depth, &isambigbase))) {
                reverse = 1;
                goto doCast;
            }
        } else {
        doCast:
            if (isambigbase && ambigerrorflag)
                CError_Error(CErrorStr188);
            if (pathcheckflag)
                CClass_CheckPathAccess(path, NULL, ACCESSPUBLIC);
            if (!(a->flags & CLASS_FLAGS_10) && !b->sominfo)
                expr = CClass_AccessPathCast(path, expr, reverse);
        }
    }

    if (typconflag && ENODE_IS(expr, EINDIRECT) && IS_TYPE_POINTER_ONLY(expr->rtype))
        expr = makemonadicnode(expr, ETYPCON);

    return expr;
}

ENode *CClass_DirectBasePointerCast(ENode *expr, TypeClass *a, TypeClass *b) {
    ClassList *base;
    VClassList *vbase;
    BClassList *path;
    BClassList list1;
    BClassList list2;
    short depth;
    Boolean isambigbase;

    for (base = a->bases; base; base = base->next) {
        if (base->base == b) {
            list1.next = &list2;
            list1.type = TYPE(a);
            list2.next = NULL;
            list2.type = TYPE(b);
            return CClass_AccessPathCast(&list1, expr, 0);
        }
    }

    for (vbase = a->vbases; vbase; vbase = vbase->next) {
        if (vbase->base == b) {
            CError_ASSERT(1273, path = CClass_GetBasePath(a, b, &depth, &isambigbase));
            return CClass_AccessPathCast(path, expr, 0);
        }
    }

    CError_FATAL(1277);
    return expr;
}

SInt32 CClass_GetPathOffset(BClassList *path) {
    SInt32 offset;
    ClassList *base;

    offset = 0;

    while (path->next) {
        if (path->type != path->next->type) {
            for (base = TYPE_CLASS(path->type)->bases; base; base = base->next) {
                if (base->base == TYPE_CLASS(path->next->type))
                    break;
            }

            if (!base) {
                CError_Error(CErrorStr221);
                return offset;
            }
        }

        if (base->is_virtual)
            return -1;
        offset += base->offset;

        path = path->next;
    }

    return offset;
}

Boolean CClass_ClassDominates(TypeClass *tclass, TypeClass *baseclass) {
    ClassList *base;

    for (base = tclass->bases; base; base = base->next) {
        if (base->base == baseclass || CClass_ClassDominates(base->base, baseclass))
            return 1;
    }

    return 0;
}

SInt32 CClass_VirtualBaseOffset(TypeClass *tclass, TypeClass *baseclass) {
    VClassList *vbase;

    for (vbase = tclass->vbases; vbase; vbase = vbase->next) {
        if (vbase->base == baseclass)
            return vbase->offset;
    }

    CError_FATAL(1342);
    return 0;
}

SInt32 CClass_VirtualBaseVTableOffset(TypeClass *tclass, TypeClass *baseclass) {
    VClassList *vbase;

    for (vbase = tclass->vbases; vbase; vbase = vbase->next) {
        if (vbase->base == baseclass)
            return vbase->voffset;
    }

    CError_FATAL(1359);
    return 0;
}

SInt32 CClass_GetMemberOffset(TypeClass *tclass, HashNameNode *name, ObjMemberVar **resultIvar) {
    ObjMemberVar *ivar;
    ClassList *base;
    SInt32 offset;
    SInt32 tmp;
    Boolean foundflag;

    for (ivar = tclass->ivars; ivar; ivar = ivar->next) {
        if (ivar->name == name) {
            if (resultIvar)
                *resultIvar = ivar;
            return ivar->offset;
        }
    }

    for (base = tclass->bases, foundflag = 0; base; base = base->next) {
        switch ((tmp = CClass_GetMemberOffset(base->base, name, resultIvar))) {
            case -3:
            case -2:
                return tmp;
            case -1:
                break;
            default:
                if (base->is_virtual)
                    return -3;
                if (foundflag)
                    return -2;
                foundflag = 1;
                offset = base->offset + tmp;
        }
    }

    return foundflag ? offset : -1;
}

Boolean CClass_OverridesBaseMember(TypeClass *tclass, HashNameNode *name, Object *obj) {
    NameSpaceObjectList *nsol;
    ClassList *base;
    Boolean result;

    result = 0;
    for (base = tclass->bases; base; base = base->next) {
        if (base->base->vtable) {
            for (nsol = CScope_FindName(base->base->nspace, name); nsol; nsol = nsol->next) {
                if (
                    nsol->object->otype == OT_OBJECT &&
                    OBJECT(nsol->object)->datatype == DVFUNC &&
                    CClass_GetOverrideKind(TYPE_FUNC(OBJECT(nsol->object)->type), TYPE_FUNC(obj->type), 1)
                    )
                    result = 1;
            }

            if (CClass_OverridesBaseMember(base->base, name, obj))
                result = 1;
        }
    }

    return result;
}

static OVClass *CClass_FindOVClass(OVClass *ovclass, TypeClass *tclass, SInt32 offset) {
    OVClassBase *ovbase;

    if (ovclass->tclass == tclass && ovclass->offset == offset)
        return ovclass;

    for (ovbase = ovclass->bases; ovbase; ovbase = ovbase->next) {
        if ((ovclass = CClass_FindOVClass(ovbase->ovclass, tclass, offset)))
            return ovclass;
    }

    return NULL;
}

static OVClass *CClass_BuildOVClassTree(OVClass *root, TypeClass *tclass, SInt32 offset, SInt32 voffset) {
    ClassList *base;
    Object *object;
    OVClass *tree;
    OVFunc *ovfunc;
    OVClassBase *ovbase;
    SInt32 vboffset;
    SInt32 vbvoffset;
    CScopeObjectIterator iter;

    tree = lalloc(sizeof(OVClass));
    memclrw(tree, sizeof(OVClass));

    tree->tclass = tclass;
    tree->offset = offset;
    tree->voffset = voffset;
    if (!root)
        root = tree;

    CScope_InitObjectIterator(&iter, tclass->nspace);
    while (1) {
        if (!(object = OBJECT(CScope_NextObjectIteratorObject(&iter))))
            break;

        if (object->datatype == DVFUNC) {
            ovfunc = lalloc(sizeof(OVFunc));
            memclrw(ovfunc, sizeof(OVFunc));

            ovfunc->next = tree->vfuncs;
            ovfunc->obj = object;
            tree->vfuncs = ovfunc;
        }
    }

    for (base = tclass->bases; base; base = base->next) {
        if (base->base->vtable || base->base->sominfo) {
            ovbase = lalloc(sizeof(OVClassBase));
            memclrw(ovbase, sizeof(OVClassBase));

            if (base->is_virtual) {
                vboffset = CClass_VirtualBaseOffset(main_class, base->base);
                if (!(ovbase->ovclass = CClass_FindOVClass(root, base->base, vboffset))) {
                    vbvoffset = CClass_VirtualBaseVTableOffset(main_class, base->base);
                    ovbase->ovclass = CClass_BuildOVClassTree(root, base->base, vboffset, vbvoffset);
                }
                ovbase->is_virtual = 1;
            } else {
                ovbase->ovclass = CClass_BuildOVClassTree(
                    root,
                    base->base,
                    offset + base->offset,
                    voffset + base->voffset);
                ovbase->is_virtual = 0;
            }

            ovbase->next = tree->bases;
            tree->bases = ovbase;
        }
    }

    return tree;
}

static Boolean CClass_IsBaseOf(OVClass *a, OVClass *b) {
    OVClassBase *ovbase;

    for (ovbase = b->bases; ovbase; ovbase = ovbase->next) {
        if (
            (ovbase->ovclass->tclass == a->tclass && ovbase->ovclass->offset == a->offset) ||
            CClass_IsBaseOf(a, ovbase->ovclass)
            )
        {
            if (!cclass_ovbase && ovbase->is_virtual)
                cclass_ovbase = ovbase->ovclass;
            return 1;
        }
    }

    return 0;
}

static void CClass_FindOVFunc(OVClass *a, OVClass *b, OVFunc *func) {
    OVFunc *scan;
    OVClassBase *ovbase;
    UInt8 overrideKind;

    if (CClass_IsBaseOf(b, a)) {
        for (scan = a->vfuncs; scan; scan = scan->next) {
            if (
                (func->obj->name == scan->obj->name) &&
                (overrideKind = CClass_GetOverrideKind(TYPE_FUNC(func->obj->type), TYPE_FUNC(scan->obj->type), 0))
                )
            {
                if (func->ovc8) {
                    if (func->ovc8->tclass == a->tclass || CClass_ClassDominates(func->ovc8->tclass, a->tclass))
                        return;
                    if (!CClass_ClassDominates(a->tclass, func->ovc8->tclass)) {
                        func->ovf10 = scan;
                        return;
                    }
                }

                if (a == cclass_root) {
                    TYPE_FUNC(scan->obj->type)->flags |= FUNC_FLAGS_20;
                    if (overrideKind == 2)
                        TYPE_FUNC(scan->obj->type)->flags |= FUNC_FLAGS_400000;
                }

                func->ovc8 = a;
                func->ovfC = scan;
                func->ovf10 = NULL;
                return;
            }
        }

        for (ovbase = a->bases; ovbase; ovbase = ovbase->next)
            CClass_FindOVFunc(ovbase->ovclass, b, func);
    }
}

static TypeList *CClass_GetCoVariantClassList(TypeList *list, TypeClass *tclass, Object *func, Boolean flag) {
    Object *object;
    TypeList *scan;
    Type *type;
    ClassList *base;
    CScopeObjectIterator iter;

    if (!flag) {
        CScope_InitObjectIterator(&iter, tclass->nspace);
        while (1) {
            if (!(object = OBJECT(CScope_NextObjectIteratorObject(&iter))))
                break;

            if (
                object->name == func->name &&
                object->datatype == DVFUNC &&
                CClass_GetOverrideKind(TYPE_FUNC(object->type), TYPE_FUNC(func->type), 0) == 2
                )
            {
                CError_ASSERT(1686,
                              IS_TYPE_POINTER_ONLY(TYPE_FUNC(object->type)->functype) &&
                              IS_TYPE_CLASS(TPTR_TARGET(TYPE_FUNC(object->type)->functype)));

                type = TPTR_TARGET(TYPE_FUNC(object->type)->functype);
                for (scan = list; scan; scan = scan->next) {
                    if (scan->type == type)
                        break;
                }

                if (!scan) {
                    scan = lalloc(sizeof(TypeList));
                    scan->type = type;
                    scan->next = list;
                    list = scan;
                }
            }
        }
    }

    for (base = tclass->bases; base; base = base->next) {
        if (base->base->vtable)
            list = CClass_GetCoVariantClassList(list, base->base, func, 0);
    }

    return list;
}

static TypeMemberFunc *CClass_GetCovariantType(TypeMemberFunc *tmethod, Type *type) {
    TypePointer *tptr;
    TypeMemberFunc *result;

    CError_ASSERT(1724,
                  IS_TYPE_METHOD(tmethod) &&
                  IS_TYPE_POINTER_ONLY(tmethod->functype));

    tptr = galloc(sizeof(TypePointer));
    *tptr = *TYPE_POINTER(tmethod->functype);
    tptr->target = type;

    result = galloc(sizeof(TypeMemberFunc));
    *result = *tmethod;
    result->flags &= ~(FUNC_FLAGS_20 | FUNC_FLAGS_400000);
    result->functype = TYPE(tptr);
    return result;
}

static Object *CClass_FindCovariantFunction(Object *func, Type *type) {
    NameSpaceObjectList *nsol;

    nsol = CScope_FindName(
        TYPE_METHOD(func->type)->theclass->nspace,
        CMangler_GetCovariantFunctionName(func, TYPE_CLASS(type)));

    CError_ASSERT(1754, nsol && !nsol->next && nsol->object->otype == OT_OBJECT);

    return OBJECT(nsol->object);
}

static ObjectList *CClass_DeclareCovariantFuncs(ObjectList *list, Object *func, TypeClass *tclass) {
    Object *newfunc;
    HashNameNode *name;
    TypeList *types;
    ObjectList *newlist;

    for (types = CClass_GetCoVariantClassList(NULL, tclass, func, 1); types; types = types->next) {
        name = CMangler_GetCovariantFunctionName(func, TYPE_CLASS(types->type));

        newfunc = galloc(sizeof(Object));
        memclrw(newfunc, sizeof(Object));

        newfunc->otype = OT_OBJECT;
        newfunc->datatype = DFUNC;
        newfunc->section = func->section;
        newfunc->nspace = func->nspace;
        newfunc->name = name;
        newfunc->type = TYPE(CClass_GetCovariantType(TYPE_METHOD(func->type), types->type));
        newfunc->qual = func->qual & ~Q_INLINE;
        newfunc->sclass = func->sclass;
        newfunc->u.func.linkname = name;

        newlist = lalloc(sizeof(ObjectList));
        newlist->object = newfunc;
        newlist->next = list;
        list = newlist;
    }

    return list;
}

void CClass_DefineCovariantFuncs(Object *method, CI_FuncData *ifuncdata) {
    NameSpace *nspace;
    TypeList *types;
    Object *covariantFunc;
    Statement *stmt;
    Type *tptr;
    Statement firstStmt;

    for (types = CClass_GetCoVariantClassList(NULL, TYPE_METHOD(method->type)->theclass, method, 1); types; types = types->next) {
        covariantFunc = CClass_FindCovariantFunction(method, types->type);
        tptr = CDecl_NewPointerType(types->type);

        nspace = CFunc_FuncGenSetup(&firstStmt, covariantFunc);
        CInline_UnpackIFunctionData(covariantFunc, ifuncdata, &firstStmt);

        for (stmt = &firstStmt; stmt; stmt = stmt->next) {
            if (stmt->type == ST_RETURN && stmt->expr)
                stmt->expr = CExpr_AssignmentPromotion(stmt->expr, tptr, ENODE_QUALS(stmt->expr), 0);
        }

        CFunc_Gen(&firstStmt, covariantFunc, 0);
        cscope_current = nspace->parent;
    }
}

static void CClass_OverrideOVClassTree(OVClass *ovclass) {
    OVClassBase *ovbase;
    OVFunc *ovfunc;

    if (cclass_root != ovclass) {
        for (ovfunc = ovclass->vfuncs; ovfunc; ovfunc = ovfunc->next)
            CClass_FindOVFunc(cclass_root, ovclass, ovfunc);
    }

    for (ovbase = ovclass->bases; ovbase; ovbase = ovbase->next)
        CClass_OverrideOVClassTree(ovbase->ovclass);
}

static void CClass_AllocVTableRec(OVClass *ovclass) {
    OVFunc *ovfunc;
    Object *object;
    SInt32 offset27;
    SInt32 offset26;
    SInt32 offset23;
    OVClassBase *ovbase;
    OLinkList *link;

    if (ovclass->alloced_vtable)
        return;

    for (ovfunc = ovclass->vfuncs; ovfunc; ovfunc = ovfunc->next) {
        offset27 = ovclass->voffset + TYPE_METHOD(ovfunc->obj->type)->x1E + CABI_GetVTableOffset(ovclass->tclass);
        CError_ASSERT(1867, offset27 < vtable_data_size);

        if (!(vtable_object_data[offset27])) {
            if (ovfunc->ovfC) {
                object = ovfunc->ovfC->obj;
                if (
                    (TYPE_FUNC(object->type)->flags & FUNC_FLAGS_400000) &&
                    CClass_GetOverrideKind(TYPE_FUNC(ovfunc->obj->type), TYPE_FUNC(object->type), 0) == 2
                    )
                {
                    CError_ASSERT(1887,
                                  IS_TYPE_POINTER_ONLY(TYPE_FUNC(ovfunc->obj->type)->functype) &&
                                  IS_TYPE_CLASS(TPTR_TARGET(TYPE_FUNC(ovfunc->obj->type)->functype)));
                    object = CClass_FindCovariantFunction(
                        object,
                        TPTR_TARGET(TYPE_FUNC(ovfunc->obj->type)->functype));
                }

                if ((offset26 = ovfunc->ovc8->offset - ovclass->offset)) {
                    if (!(TYPE_FUNC(object->type)->flags & FUNC_FLAGS_8)) {
                        cclass_ovbase = NULL;
                        CError_ASSERT(1899, CClass_IsBaseOf(ovclass, ovfunc->ovc8));

                        if (cclass_ovbase && (main_class->flags & CLASS_FLAGS_8000)) {
                            offset23 = ovclass->offset - cclass_ovbase->offset;
                            offset23 = CABI_GetCtorOffsetOffset(cclass_ovbase->tclass, NULL) - offset23;
                            CError_ASSERT(1906, offset23 > 0);
                            object = CClass_ThunkObject(object, offset26, 0, offset23);
                        } else {
                            object = CClass_ThunkObject(object, offset26, 0, -1);
                        }
                    }
                }
            } else {
                object = ovfunc->obj;
            }

            if (!(TYPE_FUNC(object->type)->flags & FUNC_FLAGS_8)) {
                link = lalloc(sizeof(OLinkList));
                link->next = vtable_object_links;
                link->obj = object;
                link->offset = offset27;
                link->somevalue = 0;
                vtable_object_links = link;
                vtable_object_data[offset27] = 1;
            }
        }
    }

    ovclass->alloced_vtable = 1;

    for (ovbase = ovclass->bases; ovbase; ovbase = ovbase->next)
        CClass_AllocVTableRec(ovbase->ovclass);
}

static Object *CClass_CheckClass(OVClass *ovclass, Boolean errorflag) {
    Object *object;
    Object *check;
    OVFunc *ovfunc;
    OVClassBase *ovbase;

    object = NULL;

    for (ovfunc = ovclass->vfuncs; ovfunc; ovfunc = ovfunc->next) {
        if (ovfunc->ovf10 && errorflag)
            CError_Error(CErrorStr251, main_class, 0, ovfunc->obj, ovfunc->ovfC->obj, ovfunc->ovf10->obj);

        if (!object) {
            check = ovfunc->ovfC ? ovfunc->ovfC->obj : ovfunc->obj;
            if (TYPE_FUNC(check->type)->flags & FUNC_FLAGS_8)
                object = check;
        }
    }

    for (ovbase = ovclass->bases; ovbase; ovbase = ovbase->next) {
        if (object)
            CClass_CheckClass(ovbase->ovclass, errorflag);
        else
            object = CClass_CheckClass(ovbase->ovclass, errorflag);
    }

    return object;
}

static void CClass_AllocVTable(TypeClass *tclass) {
    OVClass *ovclass;

    main_class = tclass;
    ovclass = CClass_BuildOVClassTree(NULL, tclass, 0, 0);
    cclass_root = ovclass;
    CClass_OverrideOVClassTree(ovclass);
    CClass_CheckClass(ovclass, 1);
    CClass_AllocVTableRec(ovclass);
}

static Object *CClass_CheckVirtuals(TypeClass *tclass) {
    OVClass *ovclass;

    main_class = tclass;
    ovclass = CClass_BuildOVClassTree(NULL, tclass, 0, 0);
    cclass_root = ovclass;
    CClass_OverrideOVClassTree(ovclass);
    return CClass_CheckClass(ovclass, 0);
}

static void CClass_CheckVirtualBaseOverrides(OVClass *a, OVClass *b, Boolean flag) {
    VClassList *vbase;
    OVFunc *ovfunc;
    OVClassBase *ovbase;

    if (flag) {
        for (ovfunc = b->vfuncs; ovfunc; ovfunc = ovfunc->next) {
            if (ovfunc->ovfC) {
                cclass_ovbase = NULL;
                CError_ASSERT(2040, CClass_IsBaseOf(b, ovfunc->ovc8));

                if (cclass_ovbase) {
                    for (vbase = a->tclass->vbases; vbase; vbase = vbase->next) {
                        if (vbase->base == cclass_ovbase->tclass)
                            break;
                    }

                    CError_ASSERT(2047, vbase);
                    vbase->has_override = 1;
                }
            }
        }
    }

    for (ovbase = b->bases; ovbase; ovbase = ovbase->next) {
        CClass_CheckVirtualBaseOverrides(a, ovbase->ovclass, flag || ovbase->is_virtual);
    }
}

static void CClass_CheckHideVirtual(OVClass *a, OVClass *b) {
    OVClassBase *ovbase;
    OVFunc *ovfunc;
    Object *foundObject;
    Boolean isAlias;
    Object *object;
    CScopeObjectIterator iter;

    if (a != b) {
        for (ovfunc = b->vfuncs; ovfunc; ovfunc = ovfunc->next) {
            if (ovfunc->ovc8 != a) {
                foundObject = NULL;
                isAlias = 0;
                CScope_InitObjectIterator(&iter, a->tclass->nspace);

                while (1) {
                    if (!(object = OBJECT(CScope_NextObjectIteratorObject(&iter))))
                        break;

                    if (object->name == ovfunc->obj->name && IS_TYPE_FUNC(object->type)) {
                        if (object->datatype != DALIAS) {
                            if (!(TYPE_FUNC(object->type)->flags & FUNC_FLAGS_20))
                                foundObject = object;
                        } else {
                            if (object->u.alias.object == ovfunc->obj) {
                                // don't show a warning if this is just an alias to the base function
                                isAlias = 1;
                                break;
                            }
                        }
                    }
                }

                if (foundObject && !isAlias)
                    CError_Warning(CErrorStr225, foundObject, ovfunc->obj);
            }
        }
    }

    for (ovbase = b->bases; ovbase; ovbase = ovbase->next)
        CClass_CheckHideVirtual(a, ovbase->ovclass);
}

void CClass_CheckOverrides(TypeClass *tclass) {
    OVClass *tree;
    Object *object;
    ObjectList *objlist;
    ClassList *base;
    VClassList *vbase;
    int i;
    CScopeObjectIterator iter;

    i = 0;
    for (base = tclass->bases; base; base = base->next) {
        base->offset = i;
        base->voffset = i;
        i++;
    }
    for (vbase = tclass->vbases; vbase; vbase = vbase->next) {
        vbase->offset = i;
        vbase->voffset = i;
        i++;
    }

    main_class = tclass;
    tree = CClass_BuildOVClassTree(NULL, tclass, 0, 0);
    cclass_root = tree;

    CClass_OverrideOVClassTree(tree);
    if (CClass_CheckClass(tree, 0))
        tclass->flags |= CLASS_FLAGS_ABSTRACT;

    if (copts.warn_hidevirtual)
        CClass_CheckHideVirtual(tree, tree);

    if (tclass->flags & CLASS_FLAGS_8000)
        CClass_CheckVirtualBaseOverrides(tree, tree, 0);

    objlist = NULL;
    CScope_InitObjectIterator(&iter, tclass->nspace);
    while (1) {
        if (!(object = OBJECT(CScope_NextObjectIteratorObject(&iter))))
            break;

        if (object->datatype == DVFUNC) {
            CError_ASSERT(2175, IS_TYPE_FUNC(object->type));
            if (TYPE_FUNC(object->type)->flags & FUNC_FLAGS_400000)
                objlist = CClass_DeclareCovariantFuncs(objlist, object, tclass);
        }
    }

    while (objlist) {
        CScope_AddObject(tclass->nspace, objlist->object->name, OBJ_BASE(objlist->object));
        objlist = objlist->next;
    }

    for (base = tclass->bases; base; base = base->next) {
        base->offset = 0;
        base->voffset = 0;
    }
    for (vbase = tclass->vbases; vbase; vbase = vbase->next) {
        vbase->offset = 0;
        vbase->voffset = 0;
    }
}

static void CClass_FindDominator(TypeClass *tclass1, SInt32 offset1, Object *object1, TypeClass *tclass2, SInt32 offset2, TypeClass *tclass3) {
    Object *object;
    ClassList *base;
    CScopeObjectIterator iter;

    CScope_InitObjectIterator(&iter, tclass1->nspace);
    while (1) {
        if (!(object = OBJECT(CScope_NextObjectIteratorObject(&iter))))
            break;

        if (
            object->name == cclass_dominator_vobject->name &&
            object->datatype == DVFUNC &&
            CClass_GetOverrideKind(TYPE_FUNC(cclass_dominator_vobject->type), TYPE_FUNC(object->type), 0)
            )
        {
            if (object == cclass_dominator_vobject && offset1 == cclass_dominator_voffset) {
                if (object1) {
                    if (cclass_dominator_oobject && cclass_dominator_ooffset != offset2) {
                        if (CClass_ClassDominates(cclass_dominator_oclass, tclass2))
                            return;
                        if (!CClass_ClassDominates(tclass2, cclass_dominator_oclass)) {
                            cclass_dominator_eobject = object1;
                            cclass_vbase = tclass3;
                            return;
                        }
                    }

                    cclass_dominator_oobject = object1;
                    cclass_dominator_ooffset = offset2;
                    cclass_dominator_oclass = tclass2;
                    cclass_dominator_eobject = NULL;
                    cclass_vbase = tclass3;
                }
                return;
            } else {
                if (!object1) {
                    object1 = object;
                    tclass2 = tclass1;
                    offset2 = offset1;
                }
                break;
            }
        }
    }

    for (base = tclass1->bases; base; base = base->next) {
        if (base->base->vtable) {
            if (!base->is_virtual) {
                CClass_FindDominator(base->base, offset1 + base->offset, object1, tclass2, offset2, tclass3);
            } else {
                SInt32 vboffset = CClass_VirtualBaseOffset(main_class, base->base);
                CClass_FindDominator(base->base, vboffset, object1, tclass2, offset2, base->base);
            }
        }
    }
}

static void CClass_ConstructVTable(TypeClass *tclass, SInt32 voffset, SInt32 offset, TypeClass *baseclass) {
    Object *object;
    Object *thunkobject;
    SInt32 newoffset;
    SInt32 newvoffset;
    ClassList *base;
    SInt32 thunkoffset;
    OLinkList *olink;
    CScopeObjectIterator iter;

    CScope_InitObjectIterator(&iter, tclass->nspace);
    while (1) {
        if (!(object = OBJECT(CScope_NextObjectIteratorObject(&iter))))
            break;

        if (object->datatype == DVFUNC) {
            newoffset = voffset + TYPE_METHOD(object->type)->x1E + CABI_GetVTableOffset(tclass);
            CError_ASSERT(2288, newoffset < vtable_data_size);

            if (!vtable_object_data[newoffset]) {
                cclass_dominator_vobject = object;
                cclass_dominator_voffset = offset;
                cclass_dominator_oobject = NULL;
                cclass_dominator_ooffset = offset;
                CClass_FindDominator(main_class, 0, NULL, NULL, 0, NULL);

                if (cclass_dominator_oobject) {
                    if (cclass_dominator_eobject)
                        CError_Error(CErrorStr251, main_class, 0, cclass_dominator_vobject, cclass_dominator_oobject, cclass_dominator_eobject);
                } else {
                    cclass_dominator_oobject = object;
                    cclass_vbase = NULL;
                }

                vtable_object_data[newoffset] = 1;

                if (!(TYPE_FUNC(cclass_dominator_oobject->type)->flags & FUNC_FLAGS_8)) {
                    if (!check_pures) {
                        thunkobject = cclass_dominator_oobject;
                        if ((thunkoffset = cclass_dominator_ooffset - offset)) {
                            if (cclass_vbase && (main_class->flags & CLASS_FLAGS_8000)) {
                                thunkobject = CClass_ThunkObject(cclass_dominator_oobject, thunkoffset, 0,
                                                                 CABI_GetCtorOffsetOffset(cclass_vbase, tclass));
                            } else {
                                thunkobject = CClass_ThunkObject(cclass_dominator_oobject, thunkoffset, 0, -1);
                            }
                        }

                        olink = lalloc(sizeof(OLinkList));
                        olink->next = vtable_object_links;
                        olink->obj = thunkobject;
                        olink->offset = newoffset;
                        olink->somevalue = 0;
                        vtable_object_links = olink;
                    }
                } else {
                    found_pure = cclass_dominator_oobject;
                }
            }
        }
    }

    for (base = tclass->bases; base; base = base->next) {
        if (base->base->vtable) {
            if (base->is_virtual) {
                newoffset = CClass_VirtualBaseOffset(main_class, base->base);
                newvoffset = CClass_VirtualBaseVTableOffset(main_class, base->base);
                    CClass_ConstructVTable(
                    base->base,
                    newvoffset,
                    newoffset,
                    base->base
                    );
            } else {
                CClass_ConstructVTable(
                    base->base,
                    voffset + base->voffset,
                    offset + base->offset,
                    baseclass
                );
            }
        }
    }
}

void CClass_ClassDefaultFuncAction(TypeClass *tclass) {
}

void CClass_ClassAction(TypeClass *tclass) {
    if (tclass->sominfo) {
        CSOM_GenerateClassStructures(tclass);
    } else if (tclass->vtable) {
        vtable_data_size = tclass->vtable->size;
        vtable_object_data = lalloc(vtable_data_size);
        memclrw(vtable_object_data, vtable_data_size);

        main_class = tclass;
        vtable_object_links = NULL;
        found_pure = NULL;
        check_pures = 0;

        CClass_AllocVTable(tclass);

        memclrw(vtable_object_data, vtable_data_size);
        if (copts.RTTI && !(tclass->flags & (CLASS_FLAGS_10 | CLASS_FLAGS_2000)))
            vtable_object_links = CRTTI_ConstructVTableHeaders(tclass, vtable_object_data, vtable_object_links);

        CError_ASSERT(2492, tclass->vtable->object->type->size == tclass->vtable->size);
        CInit_DeclareData(tclass->vtable->object, vtable_object_data, vtable_object_links, tclass->vtable->size);
    }
}

void CClass_MakeStaticActionClass(TypeClass *tclass) {
    if (tclass->vtable) {
        tclass->vtable->object->sclass = TK_STATIC;
        tclass->vtable->object->qual |= Q_20000;
        if (!(tclass->vtable->object->flags & OBJECT_FLAGS_2)) {
            CParser_NewCallBackAction(tclass->vtable->object, tclass);
        } else if (cparamblkptr->precompile != 1) {
            CParser_NewClassAction(tclass);
        }
    }
}

Object *CClass_CheckPures(TypeClass *tclass) {
    return CClass_CheckVirtuals(tclass);
}

void CClass_MemberDef(Object *obj, TypeClass *tclass) {
    switch (tclass->action) {
        case CLASS_ACTION_0:
            break;
        case CLASS_ACTION_1:
            if (IS_TYPE_FUNC(obj->type) && (TYPE_FUNC(obj->type)->flags & FUNC_FLAGS_4)) {
                if (obj->qual & Q_INLINE) {
                    if (tclass->sominfo)
                        CError_Error(CErrorStr280);
                    tclass->action = CLASS_ACTION_0;
                    CClass_MakeStaticActionClass(tclass);
                } else if (cparamblkptr->precompile != 1) {
                    CParser_NewClassAction(tclass);
                }
            }
            break;
        case CLASS_ACTION_2:
            CError_FATAL(2682);
            break;
        case CLASS_ACTION_3:
            break;
        default:
            CError_FATAL(2701);
    }
}

Object *CClass_ThisSelfObject(void) {
    ObjectList *list;

    if (cscope_currentfunc && cscope_currentclass) {
        if (cscope_currentclass->objcinfo) {
            for (list = arguments; list; list = list->next) {
                if (list->object->name == self_name_node)
                    return list->object;
            }
            CError_Error(CErrorStr301);
        } else {
            if (cscope_is_member_func) {
                for (list = arguments; list; list = list->next) {
                    if (list->object->name == this_name_node)
                        return list->object;
                }
            }
            CError_Error(CErrorStr189);
        }
    }

    CError_Error(copts.cplusplus ? CErrorStr189 : CErrorStr301);
    return NULL;
}

ENode *CClass_CreateThisSelfExpr(void) {
    Object *object;
    ENode *expr;

    if (!(object = CClass_ThisSelfObject()))
        return NULL;

    expr = create_objectrefnode(object);
    expr->rtype = CDecl_NewPointerType(TYPE(cscope_currentclass));
    expr = makemonadicnode(expr, EINDIRECT);
    expr->data.monadic->rtype = CDecl_NewPointerType(expr->rtype);

    return expr;
}

static AccessType CClass_BaseMemberAccess(BClassList *path, AccessType access) {
    ClassList *base;

    if (path->next) {
        access = CClass_BaseMemberAccess(path->next, access);
        switch (access) {
            case ACCESSPRIVATE:
            case ACCESSNONE:
                return ACCESSNONE;
        }

        for (base = TYPE_CLASS(path->type)->bases; ; base = base->next) {
            if (!base)
                return ACCESSNONE;

            if (base->base == TYPE_CLASS(path->next->type)) {
                switch (base->access) {
                    case ACCESSNONE:
                        access = ACCESSNONE;
                        break;
                    case ACCESSPROTECTED:
                        if (access == ACCESSPUBLIC)
                            access = ACCESSPROTECTED;
                        break;
                    case ACCESSPRIVATE:
                        if (access == ACCESSPRIVATE)
                            access = ACCESSNONE;
                        else
                            access = ACCESSPRIVATE;
                        break;
                    case ACCESSPUBLIC:
                        break;
                }
                break;
            }
        }
    }

    return access;
}

static Boolean CClass_CanAccess(BClassList *path, AccessType access) {
    AccessType access2;
    BClassList *scan;
    BClassList *next;
    TypeClass *prevclass;
    TypeClass *tclass;
    ClassList *base;
    ClassFriend *cfriend;

    tclass = TYPE_CLASS(path->type);
    access2 = access;
    if ((scan = path->next)) {
        if (access2 != ACCESSPRIVATE) {
            prevclass = tclass;
            while (scan) {
                for (base = prevclass->bases; base; base = base->next) {
                    if (base->base == TYPE_CLASS(scan->type))
                        break;
                }

                if (!base)
                    return 0;

                switch (base->access) {
                    case ACCESSNONE:
                        access2 = ACCESSNONE;
                        break;
                    case ACCESSPROTECTED:
                        if (access2 == ACCESSPUBLIC)
                            access2 = ACCESSPROTECTED;
                        break;
                    case ACCESSPRIVATE:
                        if (access2 == ACCESSPRIVATE)
                            access2 = ACCESSNONE;
                        else
                            access2 = ACCESSPRIVATE;
                        break;
                    case ACCESSPUBLIC:
                        break;
                }

                prevclass = TYPE_CLASS(scan->type);
                scan = scan->next;
            }
        } else {
            access2 = ACCESSNONE;
        }
    }

    if (access2 == ACCESSPUBLIC)
        return 1;

    if (access2 != ACCESSNONE) {
        if (cscope_currentclass == tclass)
            return 1;
        if (cobjc_currentclass == tclass)
            return 1;

        for (cfriend = tclass->friends; cfriend; cfriend = cfriend->next) {
            if (cfriend->isclass) {
                if (cfriend->u.theclass == cscope_currentclass)
                    return 1;
            } else {
                if (cfriend->u.obj == cscope_currentfunc)
                    return 1;
            }
        }
    }

    for (scan = path; scan->next; scan = scan->next) {
        if (CClass_CanAccess(scan->next, access)) {
            if ((next = scan->next->next) || access != ACCESSPUBLIC) {
                scan->next->next = NULL;
                if (CClass_CanAccess(path, ACCESSPUBLIC)) {
                    scan->next->next = next;
                    return 1;
                }
                scan->next->next = next;
            }
        }
    }

    return 0;
}

void CClass_CheckPathAccess(BClassList *path, Object *obj, AccessType access) {
    if (!CClass_CanAccess(path, access)) {
        if (path && obj)
            CError_Error(CErrorStr381, path->type, 0, obj);
        else
            CError_Error(CErrorStr187);
    }
}

static BClassList *CClass_PathCleanup(BClassList *path, TypeClass *tclass) {
    BClassList *first;
    ClassList *base;

    first = path;

    while (1) {
        if (!path->next) {
            if (!tclass)
                return first;
            if (path->type == TYPE(tclass))
                return first;
            return NULL;
        }

        if (path->type != path->next->type) {
            for (base = TYPE_CLASS(path->type)->bases; base; base = base->next) {
                if (base->base == TYPE_CLASS(path->next->type))
                    break;
            }

            if (base) {
                path = path->next;
            } else {
                first = path = path->next;
            }
        } else {
            path->next = path->next->next;
        }
    }
}

void CClass_CheckStaticAccess(BClassList *path, TypeClass *tclass, AccessType access) {
    ClassFriend *cfriend;

    if (path) {
        path = CClass_PathCleanup(path, tclass);
        if (path && path->next) {
            if (!CClass_CanAccess(path, access))
                CError_Error(CErrorStr187);
            return;
        }
    }

    switch (access) {
        case ACCESSPUBLIC:
            return;
        case ACCESSPRIVATE:
        case ACCESSPROTECTED:
            if (tclass == cscope_currentclass)
                return;

            for (cfriend = tclass->friends; cfriend; cfriend = cfriend->next) {
                if (cfriend->isclass) {
                    if (cfriend->u.theclass == cscope_currentclass)
                        return;
                } else {
                    if (cfriend->u.obj == cscope_currentfunc)
                        return;
                }
            }
        case ACCESSNONE:
            CError_Warning(CErrorStr187);
            return;
        default:
            CError_FATAL(3013);
    }
}

void CClass_CheckObjectAccess(BClassList *path, Object *obj) {
    short depth;
    Boolean isambigbase;

    if (obj->nspace && obj->nspace->theclass) {
        if (!path && cscope_currentclass)
            path = CClass_GetBasePath(cscope_currentclass, obj->nspace->theclass, &depth, &isambigbase);

        CClass_CheckStaticAccess(path, obj->nspace->theclass, obj->access);
    }
}

void CClass_CheckEnumAccess(BClassList *path, ObjEnumConst *objec) {
    if (path) {
        if ((path = CClass_PathCleanup(path, NULL))) {
            if (!CClass_CanAccess(path, objec->access))
                CError_Error(CErrorStr187);
            return;
        }
    }

    if (
        objec->access != ACCESSPUBLIC &&
        IS_TYPE_ENUM(objec->type) &&
        TYPE_ENUM(objec->type)->nspace &&
        TYPE_ENUM(objec->type)->nspace->theclass
        )
        CClass_CheckStaticAccess(NULL, TYPE_ENUM(objec->type)->nspace->theclass, objec->access);
}

static Type *CClass_PointerTypeCopy(Type *type) {
    Type *copy;

    switch (type->type) {
        case TYPEPOINTER:
        case TYPEARRAY:
            copy = galloc(sizeof(TypePointer));
            *TYPE_POINTER(copy) = *TYPE_POINTER(type);
            TPTR_TARGET(copy) = CClass_PointerTypeCopy(TPTR_TARGET(copy));
            return copy;
        case TYPEMEMBERPOINTER:
            copy = galloc(sizeof(TypeMemberPointer));
            *TYPE_MEMBER_POINTER(copy) = *TYPE_MEMBER_POINTER(type);
            return copy;
        default:
            return type;
    }
}

Type *CClass_CombineClassAccessQualifiers(Type *type, UInt32 qual1, UInt32 qual2, UInt32 *outflags) {
    Type *inner;

    qual2 = qual2 & (Q_CONST | Q_VOLATILE);
    if (qual1 & Q_MUTABLE)
        qual2 &= ~Q_CONST;
    qual1 = qual1 & (Q_CONST | Q_VOLATILE);

    inner = type;
    while (IS_TYPE_ARRAY(inner))
        inner = TPTR_TARGET(inner);

    switch (inner->type) {
        case TYPEMEMBERPOINTER:
        case TYPEPOINTER:
            if (qual2) {
                type = CClass_PointerTypeCopy(type);
                inner = type;
                while (IS_TYPE_ARRAY(inner))
                    inner = TPTR_TARGET(inner);

                switch (inner->type) {
                    case TYPEPOINTER:
                        TPTR_QUAL(inner) |= qual2;
                        break;
                    case TYPEMEMBERPOINTER:
                        TYPE_MEMBER_POINTER(inner)->qual |= qual2;
                        break;
                    default:
                        CError_FATAL(3125);
                }
            }
            break;
        default:
            qual1 |= qual2;
    }

    *outflags = qual1;
    return type;
}

static void CClass_OptimizeBitFieldAccess(Type **ptype, SInt32 *poffset) {
    Type *innertype;
    TypeBitfield *newtype;
    short i;

    innertype = TYPE_BITFIELD(*ptype)->bitfieldtype;
    if (TYPE_BITFIELD(*ptype)->unkB == 8) {
        switch (TYPE_BITFIELD(*ptype)->unkA) {
            case 0:
                i = 0;
                break;
            case 8:
                i = 1;
                break;
            case 16:
                i = 2;
                break;
            case 24:
                i = 3;
                break;
            default:
                i = -1;
                break;
        }

        if (i >= 0) {
            if (innertype->size != 1) {
                if (is_unsigned(TYPE_BITFIELD(*ptype)->bitfieldtype))
                    *ptype = TYPE(&stunsignedchar);
                else
                    *ptype = TYPE(&stsignedchar);
            } else {
                *ptype = innertype;
            }
            *poffset += i;
            return;
        }
    }

    if (TYPE_BITFIELD(*ptype)->unkB == 16) {
        switch (TYPE_BITFIELD(*ptype)->unkA) {
            case 0:
                i = 0;
                break;
            case 16:
                i = 2;
                break;
            default:
                i = -1;
                break;
        }

        if (i >= 0) {
            if (innertype->size != stsignedshort.size) {
                if (is_unsigned(innertype))
                    *ptype = TYPE(&stunsignedshort);
                else
                    *ptype = TYPE(&stsignedshort);
            } else {
                *ptype = innertype;
            }
            *poffset += i;
            return;
        }
    }

    if (TYPE_BITFIELD(*ptype)->unkB == 32 && TYPE_BITFIELD(*ptype)->unkA == 0) {
        if (innertype->size != stsignedlong.size) {
            if (is_unsigned(innertype))
                *ptype = TYPE(&stunsignedlong);
            else
                *ptype = TYPE(&stsignedlong);
        } else {
            *ptype = innertype;
        }
        return;
    }

    if ((*ptype)->size != stsignedchar.size) {
        i = TYPE_BITFIELD(*ptype)->unkA + TYPE_BITFIELD(*ptype)->unkB - 1;

        if (TYPE_BITFIELD(*ptype)->unkB < 8 && (TYPE_BITFIELD(*ptype)->unkA & 0xFFF8) == (i & 0xFFF8)) {
            newtype = galloc(sizeof(TypeBitfield));
            *newtype = *TYPE_BITFIELD(*ptype);
            *ptype = TYPE(newtype);

            i = 0;
            if (newtype->unkA >= 8)
                i = 1;
            if (newtype->unkA >= 16)
                i = 2;
            if (newtype->unkA >= 24)
                i = 3;
            *poffset += i;
            newtype->unkA -= 8 * i;

            newtype->bitfieldtype = is_unsigned(innertype) ? TYPE(&stunsignedchar) : TYPE(&stsignedchar);
            newtype->size = newtype->bitfieldtype->size;
            return;
        }

        if ((*ptype)->size != stsignedshort.size) {
            if (TYPE_BITFIELD(*ptype)->unkB < 16 && (TYPE_BITFIELD(*ptype)->unkA & 0xFFF0) == (i & 0xFFF0)) {
                newtype = galloc(sizeof(TypeBitfield));
                *newtype = *TYPE_BITFIELD(*ptype);
                *ptype = TYPE(newtype);

                i = 0;
                if (newtype->unkA >= 16)
                    i = stsignedshort.size;
                *poffset += i;
                newtype->unkA -= 8 * i;

                newtype->bitfieldtype = is_unsigned(innertype) ? TYPE(&stunsignedshort) : TYPE(&stsignedshort);
                newtype->size = newtype->bitfieldtype->size;
                return;
            }
        }
    }
}

ENode *CClass_AccessMember(ENode *classexpr, Type *type, UInt32 qual, SInt32 offset) {
    Type *innertype;
    UInt32 flags;

    innertype = NULL;

    if (IS_TYPE_CLASS(classexpr->rtype) && (TYPE_CLASS(classexpr->rtype)->flags & CLASS_FLAGS_1)) {
        classexpr = makemonadicnode(classexpr, EINDIRECT);
        classexpr->data.monadic->rtype = CDecl_NewPointerType(classexpr->rtype);
    }

    if (IS_TYPE_BITFIELD(type)) {
        innertype = TYPE_BITFIELD(type)->bitfieldtype;
        CClass_OptimizeBitFieldAccess(&type, &offset);
    }

    if (offset && !canadd(classexpr->data.monadic, offset)) {
        classexpr->data.monadic = makediadicnode(
            classexpr->data.monadic,
            intconstnode(TYPE(&stunsignedlong), offset),
            EADD);
        optimizecomm(classexpr->data.monadic);
    }

    if (innertype) {
        if (IS_TYPE_BITFIELD(type)) {
            classexpr->data.monadic = makemonadicnode(classexpr->data.monadic, EBITFIELD);
            classexpr->data.monadic->rtype = type;
            classexpr->rtype = TYPE_BITFIELD(type)->bitfieldtype;
        } else {
            classexpr->rtype = type;
        }
    } else {
        classexpr->rtype = type;
    }

    classexpr->rtype = CClass_CombineClassAccessQualifiers(classexpr->rtype, qual, ENODE_QUALS(classexpr), &flags);
    classexpr->flags = flags;
    return classexpr;
}