Tcl Source Code

 * The following structure stores an internal representation (internalrep) for
 * a Tcl value. An internalrep is associated with an Tcl_ObjType when both
 * are stored in the same Tcl_Obj.  The routines of the Tcl_ObjType govern
 * the handling of the internalrep.
 */

typedef union Tcl_ObjInternalRep {	/* The internal representation: */

    long longValue;		/*   - an long integer value. */

    double doubleValue;		/*   - a double-precision floating value. */

    void *otherValuePtr;	/*   - another, type-specific value, */
				/*     not used internally any more. */

    Tcl_WideInt wideValue;	/*   - an integer value >= 64bits */
    struct {			/*   - internal rep as two pointers. */
	void *ptr1;
	void *ptr2;
    } twoPtrValue;

    struct {			/*   - internal rep as a pointer and a long, */
	void *ptr;		/*     not used internally any more. */
	unsigned long value;
    } ptrAndLongRep;









} Tcl_ObjInternalRep;

/*
 * One of the following structures exists for each object in the Tcl system.
 * An object stores a value as either a string, some internal representation,
 * or both.
 */

static inline ArithSeries *
ArithSeriesGetInternalRep(
    Tcl_Obj *objPtr)
{
    const Tcl_ObjInternalRep *irPtr = TclFetchInternalRep(objPtr,
	    &arithSeriesType);
    return irPtr ? (ArithSeries *) irPtr->twoPtrValue.ptr1 : NULL;
}

/*
 * Compute number of significant fractional digits
 */
static inline unsigned
Precision(

static void
DupArithSeriesInternalRep(
    Tcl_Obj *srcPtr,		/* Object with internal rep to copy. */
    Tcl_Obj *copyPtr)		/* Object with internal rep to set. */
{
    ArithSeries *srcRepPtr = (ArithSeries *)
	    srcPtr->internalRep.twoPtrValue.ptr1;

    if (srcRepPtr->isDouble) {
	ArithSeriesDbl *srcDblPtr = (ArithSeriesDbl *) srcRepPtr;
	ArithSeriesDbl *copyDblPtr = (ArithSeriesDbl *)
		Tcl_Alloc(sizeof(ArithSeriesDbl));

	*copyDblPtr = *srcDblPtr;
	copyDblPtr->base.elements = NULL;
	copyPtr->internalRep.twoPtrValue.ptr1 = copyDblPtr;
    } else {
	ArithSeriesInt *srcIntPtr = (ArithSeriesInt *) srcRepPtr;
	ArithSeriesInt *copyIntPtr = (ArithSeriesInt *)
		Tcl_Alloc(sizeof(ArithSeriesInt));

	*copyIntPtr = *srcIntPtr;
	copyIntPtr->base.elements = NULL;
	copyPtr->internalRep.twoPtrValue.ptr1 = copyIntPtr;
    }
    copyPtr->internalRep.twoPtrValue.ptr2 = NULL;
    copyPtr->typePtr = &arithSeriesType;
}

/*
 *----------------------------------------------------------------------
 *
 * FreeArithSeriesInternalRep --

}

static void
FreeArithSeriesInternalRep(
    Tcl_Obj *arithSeriesObjPtr)
{
    ArithSeries *arithSeriesRepPtr = (ArithSeries *)
	    arithSeriesObjPtr->internalRep.twoPtrValue.ptr1;

    if (arithSeriesRepPtr) {
	FreeElements(arithSeriesRepPtr);
	Tcl_Free((char *) arithSeriesRepPtr);
    }
}

    arithSeriesRepPtr = (ArithSeriesInt *) Tcl_Alloc(sizeof(ArithSeriesInt));
    arithSeriesRepPtr->base.len = length;
    arithSeriesRepPtr->base.elements = NULL;
    arithSeriesRepPtr->base.isDouble = 0;
    arithSeriesRepPtr->start = start;
    arithSeriesRepPtr->end = end;
    arithSeriesRepPtr->step = step;
    arithSeriesObj->internalRep.twoPtrValue.ptr1 = arithSeriesRepPtr;
    arithSeriesObj->internalRep.twoPtrValue.ptr2 = NULL;
    arithSeriesObj->typePtr = &arithSeriesType;
    if (length > 0) {
	Tcl_InvalidateStringRep(arithSeriesObj);
    }

    return arithSeriesObj;
}

    arithSeriesRepPtr->base.len = length;
    arithSeriesRepPtr->base.elements = NULL;
    arithSeriesRepPtr->base.isDouble = 1;
    arithSeriesRepPtr->start = start;
    arithSeriesRepPtr->end = end;
    arithSeriesRepPtr->step = step;
    arithSeriesRepPtr->precision = maxPrecision(start, end, step);
    arithSeriesObj->internalRep.twoPtrValue.ptr1 = arithSeriesRepPtr;
    arithSeriesObj->internalRep.twoPtrValue.ptr2 = NULL;
    arithSeriesObj->typePtr = &arithSeriesType;

    if (length > 0) {
	Tcl_InvalidateStringRep(arithSeriesObj);
    }

    return arithSeriesObj;

 *----------------------------------------------------------------------
 */
Tcl_Size
ArithSeriesObjLength(
    Tcl_Obj *arithSeriesObj)
{
    ArithSeries *arithSeriesRepPtr = (ArithSeries *)
	    arithSeriesObj->internalRep.twoPtrValue.ptr1;
    return arithSeriesRepPtr->len;
}

/*
 *----------------------------------------------------------------------
 *
 * TclArithSeriesObjStep --

 *----------------------------------------------------------------------
 */
static void
UpdateStringOfArithSeries(
    Tcl_Obj *arithSeriesObjPtr)
{
    ArithSeries *arithSeriesRepPtr = (ArithSeries *)
	    arithSeriesObjPtr->internalRep.twoPtrValue.ptr1;
    char *p;
    Tcl_Obj *eleObj;
    Tcl_Size i, bytlen = 0;

    /*
     * Pass 1: estimate space.
     */

ArithSeriesInOperation(
    Tcl_Interp *interp,
    Tcl_Obj *valueObj,
    Tcl_Obj *arithSeriesObjPtr,
    int *boolResult)
{
    ArithSeries *repPtr = (ArithSeries *)
	    arithSeriesObjPtr->internalRep.twoPtrValue.ptr1;
    int status;
    Tcl_Size index, incr, elen, vlen;

    if (repPtr->isDouble) {
	ArithSeriesDbl *dblRepPtr = (ArithSeriesDbl *) repPtr;
	double y;
	int test = 0;

} ByteArray;

#define BYTEARRAY_MAX_LEN (TCL_SIZE_MAX - (Tcl_Size)offsetof(ByteArray, bytes))
#define BYTEARRAY_SIZE(len) \
	( (len < 0 || BYTEARRAY_MAX_LEN < (len)) \
	? (Tcl_Panic("negative length specified or max size of a Tcl value exceeded"), 0) \
	: (offsetof(ByteArray, bytes) + (len)) )
#define GET_BYTEARRAY(irPtr) ((ByteArray *) (irPtr)->twoPtrValue.ptr1)
#define SET_BYTEARRAY(irPtr, baPtr) \
		(irPtr)->twoPtrValue.ptr1 = (baPtr)

int
TclIsPureByteArray(
    Tcl_Obj * objPtr)
{
    return TclHasInternalRep(objPtr, &properByteArrayType);
}

    ClockFmtObj_DupInternalRep,		/* dupIntRepProc */
    ClockFmtObj_UpdateString,		/* updateStringProc */
    ClockFmtObj_SetFromAny,		/* setFromAnyProc */
    TCL_OBJTYPE_V0
};

#define ObjClockFmtScn(objPtr) \
    (*((ClockFmtScnStorage **)&(objPtr)->internalRep.twoPtrValue.ptr1))

#define ObjLocFmtKey(objPtr) \
    (*((Tcl_Obj **)&(objPtr)->internalRep.twoPtrValue.ptr2))

static void
ClockFmtObj_DupInternalRep(
    Tcl_Obj *srcPtr,
    Tcl_Obj *copyPtr)
{
    ClockFmtScnStorage *fss = ObjClockFmtScn(srcPtr);

    "substcode",		/* name */
    FreeSubstCodeInternalRep,	/* freeIntRepProc */
    DupByteCodeInternalRep,	/* dupIntRepProc - shared with bytecode */
    NULL,			/* updateStringProc */
    NULL,			/* setFromAnyProc */
    TCL_OBJTYPE_V0
};
#define SubstFlags(objPtr) (objPtr)->internalRep.twoPtrValue.ptr2

/*
 * Helper macros.
 */

#define TclIncrUInt4AtPtr(ptr, delta) \
    TclStoreInt4AtPtr(TclGetUInt4AtPtr(ptr)+(delta), (ptr))

				 * created. */
#endif /* TCL_COMPILE_STATS */
} ByteCode;

#define ByteCodeSetInternalRep(objPtr, typePtr, codePtr) \
    do {								\
	Tcl_ObjInternalRep ir;						\
	ir.twoPtrValue.ptr1 = (codePtr);				\
	ir.twoPtrValue.ptr2 = NULL;					\
	Tcl_StoreInternalRep((objPtr), (typePtr), &ir);			\
    } while (0)

#define ByteCodeGetInternalRep(objPtr, typePtr, codePtr) \
    do {								\
	const Tcl_ObjInternalRep *irPtr;				\
	irPtr = TclFetchInternalRep((objPtr), (typePtr));		\
	(codePtr) = irPtr ? (ByteCode*)irPtr->twoPtrValue.ptr1 : NULL;	\
    } while (0)

/*
 * Opcodes for the Tcl bytecode instructions. These must correspond to the
 * entries in the table of instruction descriptions, tclInstructionTable, in
 * tclCompile.c. Also, the order and number of the expression opcodes (e.g.,
 * INST_BITOR) must match the entries in the array operatorStrings in

    SetDictFromAny,		/* setFromAnyProc */
    TCL_OBJTYPE_V0
};

#define DictSetInternalRep(objPtr, dictRepPtr)				\
    do {                                                                \
	Tcl_ObjInternalRep ir;						\
	ir.twoPtrValue.ptr1 = (dictRepPtr);                             \
	ir.twoPtrValue.ptr2 = NULL;                                     \
	Tcl_StoreInternalRep((objPtr), &tclDictType, &ir);		\
    } while (0)

#define DictGetInternalRep(objPtr, dictRepPtr)				\
    do {                                                                \
	const Tcl_ObjInternalRep *irPtr;				\
	irPtr = TclFetchInternalRep((objPtr), &tclDictType);		\
	(dictRepPtr) = irPtr ? (Dict *)irPtr->twoPtrValue.ptr1 : NULL;	\
    } while (0)

/*
 * The type of the specially adapted version of the Tcl_Obj*-containing hash
 * table defined in the tclObj.c code. This version differs in that it
 * allocates a bit more space in each hash entry in order to hold the pointers
 * used to keep the hash entries in a linked list.

    }

    DictGetInternalRep(dictPtr, dict);

    result = Tcl_NewObj();
    DictSetInternalRep(result, dict);
    dict->refCount++;
    result->internalRep.twoPtrValue.ptr2 = NULL;
    result->typePtr = &tclDictType;

    return result;
}

/*
 *----------------------------------------------------------------------

static Tcl_EncodingConvertProc	UtfToUtf16Proc;
static Tcl_EncodingConvertProc	UtfToUcs2Proc;
static Tcl_EncodingConvertProc	UtfToUtfProc;
static Tcl_EncodingConvertProc	Iso88591FromUtfProc;
static Tcl_EncodingConvertProc	Iso88591ToUtfProc;

/*
 * A Tcl_ObjType for holding a cached Tcl_Encoding in the twoPtrValue.ptr1
 * field of the internalrep. This should help the lifetime of encodings be more
 * useful. See concerns raised in [Bug 1077262].
 */

static const Tcl_ObjType encodingType = {
    "encoding",
    FreeEncodingInternalRep,
    DupEncodingInternalRep,
    NULL,
    NULL,
    TCL_OBJTYPE_V0
};

#define EncodingSetInternalRep(objPtr, encoding) \
    do {								\
	Tcl_ObjInternalRep ir;						\
	ir.twoPtrValue.ptr1 = (encoding);				\
	ir.twoPtrValue.ptr2 = NULL;					\
	Tcl_StoreInternalRep((objPtr), &encodingType, &ir);		\
    } while (0)

#define EncodingGetInternalRep(objPtr, encoding) \
    do {								\
	const Tcl_ObjInternalRep *irPtr;				\
	irPtr = TclFetchInternalRep ((objPtr), &encodingType);		\
	(encoding) = irPtr ? (Tcl_Encoding)irPtr->twoPtrValue.ptr1 : NULL; \
    } while (0)

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetEncodingFromObj --
 *

    NULL,			/* setFromAnyProc */
    TCL_OBJTYPE_V0
};

#define ECRSetInternalRep(objPtr, ecRepPtr) \
    do {								\
	Tcl_ObjInternalRep ir;						\
	ir.twoPtrValue.ptr1 = (ecRepPtr);				\
	ir.twoPtrValue.ptr2 = NULL;					\
	Tcl_StoreInternalRep((objPtr), &ensembleCmdType, &ir);		\
    } while (0)

#define ECRGetInternalRep(objPtr, ecRepPtr) \
    do {								\
	const Tcl_ObjInternalRep *irPtr;				\
	irPtr = TclFetchInternalRep((objPtr), &ensembleCmdType);	\
	(ecRepPtr) = irPtr ? (EnsembleCmdRep *)				\
		irPtr->twoPtrValue.ptr1 : NULL;				\
    } while (0)

/*
 * The internal rep for caching ensemble subcommand lookups and spelling
 * corrections.
 */

    } while (0)

#define PUSH_TAUX_OBJ(objPtr) \
    do {							\
	if (auxObjList) {					\
	    (objPtr)->length += auxObjList->length;		\
	}							\
	(objPtr)->internalRep.twoPtrValue.ptr1 = auxObjList;	\
	auxObjList = (objPtr);					\
    } while (0)

#define POP_TAUX_OBJ() \
    do {							\
	tmpPtr = auxObjList;					\
	auxObjList = (Tcl_Obj *)tmpPtr->internalRep.twoPtrValue.ptr1;	\
	Tcl_DecrRefCount(tmpPtr);				\
    } while (0)

/*
 * These variable-access macros have to coincide with those in tclVar.c
 */

    assert(irPtr != NULL);

    /*
     * First kill the search, and then release the reference to the dictionary
     * that we were holding.
     */

    searchPtr = (Tcl_DictSearch *)irPtr->twoPtrValue.ptr1;
    Tcl_DictObjDone(searchPtr);
    Tcl_Free(searchPtr);

    dictPtr = (Tcl_Obj *)irPtr->twoPtrValue.ptr2;
    TclDecrRefCount(dictPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * InitByteCodeExecution --

	 * we do not define a special tclObjType for it. It is not dangerous
	 * as the obj is never passed anywhere, so that all manipulations are
	 * performed here and in INST_INVOKE_EXPANDED (in case of an expansion
	 * error, also in INST_EXPAND_STKTOP).
	 */

	TclNewObj(objPtr);
	objPtr->internalRep.twoPtrValue.ptr2 = INT2PTR(CURR_DEPTH);
	objPtr->length = 0;
	PUSH_TAUX_OBJ(objPtr);
	TRACE(("=> mark depth as %" TCL_T_MODIFIER "d\n", CURR_DEPTH));
	NEXT_INST_F(1, 0, 0);
    break;

    case INST_EXPAND_DROP:
	/*
	 * Drops an element of the auxObjList, popping stack elements to
	 * restore the stack to the state before the point where the aux
	 * element was created.
	 */

	CLANG_ASSERT(auxObjList);
	objc = CURR_DEPTH - PTR2INT(auxObjList->internalRep.twoPtrValue.ptr2);
	POP_TAUX_OBJ();
#ifdef TCL_COMPILE_DEBUG
	/* Ugly abuse! */
	starting = 1;
#endif
	TRACE(("=> drop %" TCL_SIZE_MODIFIER "d items\n", objc));
	NEXT_INST_V(1, objc, 0);

	TEBC_YIELD();
	/* add TEBCResume for object at top of stack */
	return TclNRExecuteByteCode(interp,
		    TclCompileObj(interp, OBJ_AT_TOS, NULL, 0));

    case INST_INVOKE_EXPANDED:
	CLANG_ASSERT(auxObjList);
	objc = CURR_DEPTH - PTR2INT(auxObjList->internalRep.twoPtrValue.ptr2);
	POP_TAUX_OBJ();
	if (objc) {
	    pcAdjustment = 1;
	    goto doInvocation;
	}

	/*

	 * Store the iterNum and iterMax in a single Tcl_Obj; we keep a
	 * nul-string obj with the pointer stored in the ptrValue so that the
	 * thing is properly garbage collected. THIS OBJ MAKES NO SENSE, but
	 * it will never leave this scope and is read-only.
	 */

	TclNewObj(tmpPtr);
	tmpPtr->internalRep.twoPtrValue.ptr1 = NULL;
	tmpPtr->internalRep.twoPtrValue.ptr2 = (void *)iterMax;
	PUSH_OBJECT(tmpPtr); /* iterCounts object */

	/*
	 * Store a pointer to the ForeachInfo struct; same dirty trick
	 * as above
	 */

	TclNewObj(tmpPtr);
	tmpPtr->internalRep.twoPtrValue.ptr1 = infoPtr;
	PUSH_OBJECT(tmpPtr); /* infoPtr object */
	TRACE_APPEND(("jump to loop step\n"));

	/*
	 * Jump directly to the INST_FOREACH_STEP instruction; the C code just
	 * falls through.
	 */

	pc += 5 - infoPtr->loopCtTemp;

    case INST_FOREACH_STEP: /* TODO: address abstract list indexing here! */
	/*
	 * "Step" a foreach loop (i.e., begin its next iteration) by assigning
	 * the next value list element to each loop var.
	 */

	tmpPtr = OBJ_AT_TOS;
	infoPtr = (ForeachInfo *)tmpPtr->internalRep.twoPtrValue.ptr1;
	numLists = infoPtr->numLists;
	TRACE(("=> "));

	tmpPtr = OBJ_AT_DEPTH(1);
	iterNum = (size_t)tmpPtr->internalRep.twoPtrValue.ptr1;
	iterMax = (size_t)tmpPtr->internalRep.twoPtrValue.ptr2;

	/*
	 * If some list still has a remaining list element iterate one more
	 * time. Assign to var the next element from its value list.
	 */

	if (iterNum < iterMax) {
	    int status;
	    /*
	     * Set the variables and jump back to run the body
	     */

	    tmpPtr->internalRep.twoPtrValue.ptr1 =(void *)(iterNum + 1);

	    listTmpDepth = numLists + 1;

	    for (i = 0;  i < numLists;  i++) {
		varListPtr = infoPtr->varLists[i];
		numVars = varListPtr->numVars;
		int hasAbstractList;

	 */
	pc++;
#endif

    case INST_FOREACH_END:
	/* THIS INSTRUCTION IS ONLY CALLED AS A BREAK TARGET */
	tmpPtr = OBJ_AT_TOS;
	infoPtr = (ForeachInfo *)tmpPtr->internalRep.twoPtrValue.ptr1;
	numLists = infoPtr->numLists;
	TRACE(("=> loop terminated\n"));
	NEXT_INST_V(1, numLists+2, 0);

    case INST_LMAP_COLLECT:
	/*
	 * This instruction is only issued by lmap. The stack is:
	 *   - result
	 *   - infoPtr
	 *   - loop counters
	 *   - valLists
	 *   - collecting obj (unshared)
	 * The instruction lappends the result to the collecting obj.
	 */

	tmpPtr = OBJ_AT_DEPTH(1);
	infoPtr = (ForeachInfo *)tmpPtr->internalRep.twoPtrValue.ptr1;
	numLists = infoPtr->numLists;
	TRACE_APPEND(("=> appending to list at depth %" TCL_SIZE_MODIFIER "d\n", 3 + numLists));

	objPtr = OBJ_AT_DEPTH(3 + numLists);
	Tcl_ListObjAppendElement(NULL, objPtr, OBJ_AT_TOS);
	NEXT_INST_F(1, 1, 0);
    }

	    Tcl_Free(searchPtr);
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	{
	    Tcl_ObjInternalRep ir;
	    TclNewObj(statePtr);
	    ir.twoPtrValue.ptr1 = searchPtr;
	    ir.twoPtrValue.ptr2 = dictPtr;
	    Tcl_StoreInternalRep(statePtr, &dictIteratorType, &ir);
	}
	varPtr = LOCAL(opnd);
	if (varPtr->value.objPtr) {
	    if (TclHasInternalRep(varPtr->value.objPtr, &dictIteratorType)) {
		Tcl_Panic("mis-issued dictFirst!");
	    }

	TRACE(("%u => ", opnd));
	statePtr = (*LOCAL(opnd)).value.objPtr;
	{
	    const Tcl_ObjInternalRep *irPtr;

	    if (statePtr &&
		    (irPtr = TclFetchInternalRep(statePtr, &dictIteratorType))) {
		searchPtr = (Tcl_DictSearch *)irPtr->twoPtrValue.ptr1;
		Tcl_DictObjNext(searchPtr, &keyPtr, &valuePtr, &done);
	    } else {
		Tcl_Panic("mis-issued dictNext!");
	    }
	}
    pushDictIteratorResult:
	if (done) {

	 * Clear all expansions that may have started after the last
	 * INST_BEGIN_CATCH.
	 */

	while (auxObjList) {
	    if ((catchTop != initCatchTop)
		    && (PTR2INT(*catchTop) >
			PTR2INT(auxObjList->internalRep.twoPtrValue.ptr2))) {
		break;
	    }
	    POP_TAUX_OBJ();
	}

	/*
	 * We must not catch if the script in progress has been canceled with

    TCL_OBJTYPE_V0
};

#define ChanSetInternalRep(objPtr, resPtr)					\
    do {								\
	Tcl_ObjInternalRep ir;						\
	(resPtr)->refCount++;						\
	ir.twoPtrValue.ptr1 = (resPtr);					\
	ir.twoPtrValue.ptr2 = NULL;					\
	Tcl_StoreInternalRep((objPtr), &chanObjType, &ir);			\
    } while (0)

#define ChanGetInternalRep(objPtr, resPtr)					\
    do {								\
	const Tcl_ObjInternalRep *irPtr;					\
	irPtr = TclFetchInternalRep((objPtr), &chanObjType);		\
	(resPtr) = irPtr ? (ResolvedChanName *)irPtr->twoPtrValue.ptr1 : NULL;		\
    } while (0)

#define BUSY_STATE(st, fl) \
     ((((st)->csPtrR) && ((fl) & TCL_READABLE)) || \
      (((st)->csPtrW) && ((fl) & TCL_WRITABLE)))

#define MAX_CHANNEL_BUFFER_SIZE (1024*1024)

    UpdateStringOfIndex,	/* updateStringProc */
    NULL,			/* setFromAnyProc */
    TCL_OBJTYPE_V0
};

/*
 * The definition of the internal representation of the "index" object; The
 * internalRep.twoPtrValue.ptr1 field of an object of "index" type will be a
 * pointer to one of these structures.
 *
 * Keep this structure declaration in sync with tclTestObj.c
 */

typedef struct {
    void *tablePtr;		/* Pointer to the table of strings */

    /*
     * See if there is a valid cached result from a previous lookup.
     */

    if (objPtr && !(flags & TCL_INDEX_TEMP_TABLE)) {
	irPtr = TclFetchInternalRep(objPtr, &tclIndexType);
	if (irPtr) {
	    indexRep = (IndexRep *)irPtr->twoPtrValue.ptr1;
	    if ((indexRep->tablePtr == tablePtr)
		    && (indexRep->offset == offset)
		    && (indexRep->index != TCL_INDEX_NONE)) {
		index = indexRep->index;
		goto uncachedDone;
	    }
	}

     * new internal-rep if at all possible since that is potentially a slow
     * operation.
     */

    if (objPtr && (index != TCL_INDEX_NONE) && !(flags & TCL_INDEX_TEMP_TABLE)) {
    irPtr = TclFetchInternalRep(objPtr, &tclIndexType);
    if (irPtr) {
	indexRep = (IndexRep *)irPtr->twoPtrValue.ptr1;
    } else {
	Tcl_ObjInternalRep ir;

	indexRep = (IndexRep*)Tcl_Alloc(sizeof(IndexRep));
	ir.twoPtrValue.ptr1 = indexRep;
	Tcl_StoreInternalRep(objPtr, &tclIndexType, &ir);
    }
    indexRep->tablePtr = (void *) tablePtr;
    indexRep->offset = offset;
    indexRep->index = index;
    }

 *----------------------------------------------------------------------
 */

static void
UpdateStringOfIndex(
    Tcl_Obj *objPtr)
{
    IndexRep *indexRep = (IndexRep *)TclFetchInternalRep(objPtr, &tclIndexType)->twoPtrValue.ptr1;
    const char *indexStr = EXPAND_OF(indexRep);

    Tcl_InitStringRep(objPtr, indexStr, strlen(indexStr));
}

/*
 *----------------------------------------------------------------------

DupIndex(
    Tcl_Obj *srcPtr,
    Tcl_Obj *dupPtr)
{
    Tcl_ObjInternalRep ir;
    IndexRep *dupIndexRep = (IndexRep *)Tcl_Alloc(sizeof(IndexRep));

    memcpy(dupIndexRep, TclFetchInternalRep(srcPtr, &tclIndexType)->twoPtrValue.ptr1,
	    sizeof(IndexRep));

    ir.twoPtrValue.ptr1 = dupIndexRep;
    Tcl_StoreInternalRep(dupPtr, &tclIndexType, &ir);
}

/*
 *----------------------------------------------------------------------
 *
 * FreeIndex --

 *----------------------------------------------------------------------
 */

static void
FreeIndex(
    Tcl_Obj *objPtr)
{
    Tcl_Free(TclFetchInternalRep(objPtr, &tclIndexType)->twoPtrValue.ptr1);
    objPtr->typePtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInitPrefixCmd --

	for (i=0 ; i<toPrint ; i++) {
	    /*
	     * Add the element, quoting it if necessary.
	     */
	    const Tcl_ObjInternalRep *irPtr;

	    if ((irPtr = TclFetchInternalRep(origObjv[i], &tclIndexType))) {
		IndexRep *indexRep = (IndexRep *)irPtr->twoPtrValue.ptr1;

		elementStr = EXPAND_OF(indexRep);
		elemLen = strlen(elementStr);
	    } else {
		elementStr = TclGetStringFromObj(origObjv[i], &elemLen);
	    }
	    flags = 0;

	 * If the object is an index type, use the index table which allows for
	 * the correct error message even if the subcommand was abbreviated.
	 * Otherwise, just use the string rep.
	 */
	const Tcl_ObjInternalRep *irPtr;

	if ((irPtr = TclFetchInternalRep(objv[i], &tclIndexType))) {
	    IndexRep *indexRep = (IndexRep *)irPtr->twoPtrValue.ptr1;

	    Tcl_AppendStringsToObj(objPtr, EXPAND_OF(indexRep), (char *)NULL);
	} else {
	    /*
	     * Quote the argument if it contains spaces (Bug 942757).
	     */

     ((objc_) = ListRepLength(listRepPtr_)))

/* Returns 1/0 whether the ListRep's ListStore is shared. */
#define ListRepIsShared(listRepPtr_) ((listRepPtr_)->storePtr->refCount > 1)

/* Returns a pointer to the ListStore component */
#define ListObjStorePtr(listObj_) \
    ((ListStore *)((listObj_)->internalRep.twoPtrValue.ptr1))

/* Returns a pointer to the ListSpan component */
#define ListObjSpanPtr(listObj_) \
    ((ListSpan *)((listObj_)->internalRep.twoPtrValue.ptr2))

/* Returns the ListRep internal representaton in a Tcl_Obj */
#define ListObjGetRep(listObj_, listRepPtr_) \
    do {								\
	(listRepPtr_)->storePtr = ListObjStorePtr(listObj_);		\
	(listRepPtr_)->spanPtr = ListObjSpanPtr(listObj_);		\
    } while (0)

	AllocCache *cachePtr;						\
	if (((interp) == NULL) ||					\
		((cachePtr = ((Interp *)(interp))->allocCache),		\
			(cachePtr->numObjects == 0))) {			\
	    (objPtr) = TclThreadAllocObj();				\
	} else {							\
	    (objPtr) = cachePtr->firstObjPtr;				\
	    cachePtr->firstObjPtr = (Tcl_Obj *)(objPtr)->internalRep.twoPtrValue.ptr1; \
	    --cachePtr->numObjects;					\
	}								\
    } while (0)

#  define TclFreeObjStorageEx(interp, objPtr)				\
    do {								\
	AllocCache *cachePtr;						\
	if (((interp) == NULL) ||					\
		((cachePtr = ((Interp *)(interp))->allocCache),		\
			((cachePtr->numObjects == 0) ||			\
			(cachePtr->numObjects >= ALLOC_NOBJHIGH)))) {	\
	    TclThreadFreeObj(objPtr);					\
	} else {							\
	    (objPtr)->internalRep.twoPtrValue.ptr1 = cachePtr->firstObjPtr; \
	    cachePtr->firstObjPtr = objPtr;				\
	    ++cachePtr->numObjects;					\
	}								\
    } while (0)

#else /* not PURIFY or USE_THREAD_ALLOC */

    do {								\
	Tcl_MutexLock(&tclObjMutex);					\
	if (tclFreeObjList == NULL) {					\
	    TclAllocateFreeObjects();					\
	}								\
	(objPtr) = tclFreeObjList;					\
	tclFreeObjList = (Tcl_Obj *)					\
		tclFreeObjList->internalRep.twoPtrValue.ptr1;		\
	Tcl_MutexUnlock(&tclObjMutex);					\
    } while (0)

#  define TclFreeObjStorageEx(interp, objPtr) \
    do {								\
	Tcl_MutexLock(&tclObjMutex);					\
	(objPtr)->internalRep.twoPtrValue.ptr1 = (void *) tclFreeObjList; \
	tclFreeObjList = (objPtr);					\
	Tcl_MutexUnlock(&tclObjMutex);					\
    } while (0)
#endif

#else /* TCL_MEM_DEBUG */
MODULE_SCOPE void	TclDbInitNewObj(Tcl_Obj *objPtr, const char *file,

 *----------------------------------------------------------------
 */

#define TclUnpackBignum(objPtr, bignum) \
    do {								\
	Tcl_Obj *bignumObj = (objPtr);					\
	int bignumPayload =						\
		PTR2INT(bignumObj->internalRep.twoPtrValue.ptr2);	\
	if (bignumPayload == -1) {					\
	    (bignum) = *((mp_int *) bignumObj->internalRep.twoPtrValue.ptr1); \
	} else {							\
	    (bignum).dp = (mp_digit *)bignumObj->internalRep.twoPtrValue.ptr1;	\
	    (bignum).sign = bignumPayload >> 30;			\
	    (bignum).alloc = (bignumPayload >> 15) & 0x7FFF;		\
	    (bignum).used = bignumPayload & 0x7FFF;			\
	}								\
    } while (0)

/*

 * ListObjReplaceRepAndInvalidate - Like ListObjOverwriteRep but additionally
 * assumes the Tcl_Obj internal rep is valid (and possibly even same as
 * passed ListRep) and frees it first. Additionally invalidates the string
 * representation. Generally used when modifying a Tcl_Obj value.
 */
#define ListObjStompRep(objPtr_, repPtr_)                              \
    do {                                                               \
	(objPtr_)->internalRep.twoPtrValue.ptr1 = (repPtr_)->storePtr; \
	(objPtr_)->internalRep.twoPtrValue.ptr2 = (repPtr_)->spanPtr;  \
	(objPtr_)->typePtr = &tclListType;                             \
    } while (0)

#define ListObjOverwriteRep(objPtr_, repPtr_) \
    do {                                      \
	ListRepIncrRefs(repPtr_);             \
	ListObjStompRep(objPtr_, repPtr_);    \

    /*
     * Note old string representation NOT to be invalidated.
     * So do NOT use ListObjReplaceRepAndInvalidate. InternalRep to be freed AFTER
     * IncrRefs so do not use ListObjOverwriteRep
     */
    ListRepIncrRefs(&listRep);
    TclFreeInternalRep(objPtr);
    objPtr->internalRep.twoPtrValue.ptr1 = listRep.storePtr;
    objPtr->internalRep.twoPtrValue.ptr2 = listRep.spanPtr;
    objPtr->typePtr = &tclListType;

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------

    TCL_OBJTYPE_V0
};

#define NsNameSetInternalRep(objPtr, nnPtr) \
    do {								\
	Tcl_ObjInternalRep ir;						\
	(nnPtr)->refCount++;						\
	ir.twoPtrValue.ptr1 = (nnPtr);					\
	ir.twoPtrValue.ptr2 = NULL;					\
	Tcl_StoreInternalRep((objPtr), &nsNameType, &ir);		\
    } while (0)

#define NsNameGetInternalRep(objPtr, nnPtr) \
    do {								\
	const Tcl_ObjInternalRep *irPtr;				\
	irPtr = TclFetchInternalRep((objPtr), &nsNameType);		\
	(nnPtr) = irPtr ? (ResolvedNsName *) irPtr->twoPtrValue.ptr1 : NULL; \
    } while (0)

/*
 * Array of values describing how to implement each standard subcommand of the
 * "namespace" command.
 */

    Tcl_Obj *objPtr,
    CallChain *callPtr)
{
    Tcl_ObjInternalRep ir;

    callPtr->refCount++;
    TclGetString(objPtr);
    ir.twoPtrValue.ptr1 = callPtr;
    Tcl_StoreInternalRep(objPtr, &methodNameType, &ir);
}

void
TclOOStashContext(
    Tcl_Obj *objPtr,
    CallContext *contextPtr)

static void
DupMethodNameRep(
    Tcl_Obj *srcPtr,
    Tcl_Obj *dstPtr)
{
    StashCallChain(dstPtr, (CallChain *)
	    TclFetchInternalRep(srcPtr, &methodNameType)->twoPtrValue.ptr1);
}

static void
FreeMethodNameRep(
    Tcl_Obj *objPtr)
{
    TclOODeleteChain((CallChain *)
	    TclFetchInternalRep(objPtr, &methodNameType)->twoPtrValue.ptr1);
}

/*
 * ----------------------------------------------------------------------
 *
 * TclOOInvokeContext --
 *

	 * the object, and in the class).
	 */

	const Tcl_ObjInternalRep *irPtr;
	const int reuseMask = (WANT_PUBLIC(flags) ? ~0 : ~PUBLIC_METHOD);

	if ((irPtr = TclFetchInternalRep(cacheInThisObj, &methodNameType))) {
	    callPtr = (CallChain *) irPtr->twoPtrValue.ptr1;
	    if (IsStillValid(callPtr, oPtr, flags, reuseMask)) {
		callPtr->refCount++;
		goto returnContext;
	    }
	    Tcl_StoreInternalRep(cacheInThisObj, &methodNameType, NULL);
	}

 * Macros to pack/unpack a bignum's fields in a Tcl_Obj internal rep
 */

#define PACK_BIGNUM(bignum, objPtr) \
    if ((bignum).used > 0x7FFF) {                                   \
	mp_int *temp = (mp_int *)Tcl_Alloc(sizeof(mp_int));             \
	*temp = bignum;                                                 \
	(objPtr)->internalRep.twoPtrValue.ptr1 = temp;                  \
	(objPtr)->internalRep.twoPtrValue.ptr2 = INT2PTR(-1);           \
    } else if (((bignum).alloc <= 0x7FFF) || (mp_shrink(&(bignum))) == MP_OKAY) { \
	(objPtr)->internalRep.twoPtrValue.ptr1 = (bignum).dp;           \
	(objPtr)->internalRep.twoPtrValue.ptr2 = INT2PTR(((bignum).sign << 30) \
		| ((bignum).alloc << 15) | ((bignum).used));                \
    }

/*
 * Prototypes for functions defined later in this file:
 */

static int		ParseBoolean(Tcl_Obj *objPtr);

 * The structure below defines the command name Tcl object type by means of
 * functions that can be invoked by generic object code. Objects of this type
 * cache the Command pointer that results from looking up command names in the
 * command hashtable. Such objects appear as the zeroth ("command name")
 * argument in a Tcl command.
 *
 * NOTE: the ResolvedCmdName that gets cached is stored in the
 * twoPtrValue.ptr1 field, and the twoPtrValue.ptr2 field is unused. You might
 * think you could use the simpler otherValuePtr field to store the single
 * ResolvedCmdName pointer, but DO NOT DO THIS. It seems that some extensions
 * use the second internal pointer field of the twoPtrValue field for their
 * own purposes.
 *
 * TRICKY POINT! Some extensions update this structure! (Notably, these
 * include TclBlend and TCom). This is highly ill-advised on their part, but

 *
 * Results:
 *	None.
 *
 * Side effects:
 *	tclFreeObjList, the head of the list of free Tcl_Objs, is set to the
 *	first of a number of free Tcl_Obj's linked together by their
 *	internalRep.twoPtrValue.ptr1's.
 *
 *----------------------------------------------------------------------
 */

#define OBJS_TO_ALLOC_EACH_TIME 100

void

     */

    basePtr = (char *)Tcl_Alloc(bytesToAlloc);

    prevPtr = NULL;
    objPtr = (Tcl_Obj *) basePtr;
    for (i = 0; i < OBJS_TO_ALLOC_EACH_TIME; i++) {
	objPtr->internalRep.twoPtrValue.ptr1 = prevPtr;
	prevPtr = objPtr;
	objPtr++;
    }
    tclFreeObjList = prevPtr;
}
#undef OBJS_TO_ALLOC_EACH_TIME


FreeBignum(
    Tcl_Obj *objPtr)
{
    mp_int toFree;		/* Bignum to free */

    TclUnpackBignum(objPtr, toFree);
    mp_clear(&toFree);
    if (PTR2INT(objPtr->internalRep.twoPtrValue.ptr2) < 0) {
	Tcl_Free(objPtr->internalRep.twoPtrValue.ptr1);
    }
    objPtr->typePtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *

		TclUnpackBignum(objPtr, temp);
		if (mp_init_copy(bignumValue, &temp) != MP_OKAY) {
		    return TCL_ERROR;
		}
	    } else {
		TclUnpackBignum(objPtr, *bignumValue);
		/* Optimized TclFreeInternalRep */
		objPtr->internalRep.twoPtrValue.ptr1 = NULL;
		objPtr->internalRep.twoPtrValue.ptr2 = NULL;
		objPtr->typePtr = NULL;
		/*
		 * TODO: If objPtr has a string rep, this leaves
		 * it undisturbed.  Not clear that's proper. Pure
		 * bignum values are converted to empty string.
		 */
		if (objPtr->bytes == NULL) {

     * Check also that the command's epoch is up to date, and that the command
     * is not deleted.
     *
     * If any check fails, then force another conversion to the command type,
     * to discard the old rep and create a new one.
     */

    resPtr = (ResolvedCmdName *)objPtr->internalRep.twoPtrValue.ptr1;
    if (TclHasInternalRep(objPtr, &tclCmdNameType)) {
	Command *cmdPtr = resPtr->cmdPtr;

	if ((cmdPtr->cmdEpoch == resPtr->cmdEpoch)
		&& (interp == cmdPtr->nsPtr->interp)
		&& !(cmdPtr->nsPtr->flags & NS_DYING)) {
	    Namespace *refNsPtr = (Namespace *)

     * had is invalid one way or another.
     */

    /* See [07d13d99b0a9] why we cannot call SetCmdNameFromAny() directly here. */
    if (tclCmdNameType.setFromAnyProc(interp, objPtr) != TCL_OK) {
	return NULL;
    }
    resPtr = (ResolvedCmdName *)objPtr->internalRep.twoPtrValue.ptr1;
    return (Tcl_Command) (resPtr ? resPtr->cmdPtr : NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * TclSetCmdNameObj --

	fillPtr->refNsId = currNsPtr->nsId;
	fillPtr->refNsCmdEpoch = currNsPtr->cmdRefEpoch;
    }

    if (resPtr == NULL) {
	TclFreeInternalRep(objPtr);

	objPtr->internalRep.twoPtrValue.ptr1 = fillPtr;
	objPtr->internalRep.twoPtrValue.ptr2 = NULL;
	objPtr->typePtr = &tclCmdNameType;
    }
}

void
TclSetCmdNameObj(
    Tcl_Interp *interp,		/* Points to interpreter containing command
				 * that should be cached in objPtr. */
    Tcl_Obj *objPtr,	/* Points to Tcl object to be changed to a
				 * CmdName object. */
    Command *cmdPtr)		/* Points to Command structure that the
				 * CmdName object should refer to. */
{
    ResolvedCmdName *resPtr;

    if (TclHasInternalRep(objPtr, &tclCmdNameType)) {
	resPtr = (ResolvedCmdName *)objPtr->internalRep.twoPtrValue.ptr1;
	if (resPtr != NULL && resPtr->cmdPtr == cmdPtr) {
	    return;
	}
    }

    SetCmdNameObj(interp, objPtr, cmdPtr, NULL);
}

 */

static void
FreeCmdNameInternalRep(
    Tcl_Obj *objPtr)	/* CmdName object with internal
				 * representation to free. */
{
    ResolvedCmdName *resPtr = (ResolvedCmdName *)objPtr->internalRep.twoPtrValue.ptr1;

	/*
	 * Decrement the reference count of the ResolvedCmdName structure. If
	 * there are no more uses, free the ResolvedCmdName structure.
	 */

	if (resPtr->refCount-- <= 1) {

 */

static void
DupCmdNameInternalRep(
    Tcl_Obj *srcPtr,		/* Object with internal rep to copy. */
    Tcl_Obj *copyPtr)	/* Object with internal rep to set. */
{
    ResolvedCmdName *resPtr = (ResolvedCmdName *)srcPtr->internalRep.twoPtrValue.ptr1;

    copyPtr->internalRep.twoPtrValue.ptr1 = resPtr;
    copyPtr->internalRep.twoPtrValue.ptr2 = NULL;
	resPtr->refCount++;
    copyPtr->typePtr = &tclCmdNameType;
}

/*
 *----------------------------------------------------------------------
 *

     * report the failure to find the command as an error.
     */

    if (cmdPtr == NULL || !TclRoutineHasName(cmdPtr)) {
	return TCL_ERROR;
    }

    resPtr = (ResolvedCmdName *)objPtr->internalRep.twoPtrValue.ptr1;
    if (TclHasInternalRep(objPtr, &tclCmdNameType) && (resPtr->refCount == 1)) {
	/*
	 * Re-use existing ResolvedCmdName struct when possible.
	 * Cleanup the old fields that need it.
	 */

	Command *oldCmdPtr = resPtr->cmdPtr;

    if (objv[1]->typePtr) {
	if (TclHasInternalRep(objv[1], &tclDoubleType)) {
	    Tcl_AppendPrintfToObj(descObj, ", internal representation %g",
		    objv[1]->internalRep.doubleValue);
	} else {
	    Tcl_AppendPrintfToObj(descObj, ", internal representation %p:%p",
		    (void *) objv[1]->internalRep.twoPtrValue.ptr1,
		    (void *) objv[1]->internalRep.twoPtrValue.ptr2);
	}
    }

    if (objv[1]->bytes) {
	Tcl_AppendToObj(descObj, ", string representation \"", -1);
	Tcl_AppendLimitedToObj(descObj, objv[1]->bytes, objv[1]->length,
		16, "...");

#define TCLPATH_NEEDNORM 4

/*
 * Define some macros to give us convenient access to path-object specific
 * fields.
 */

#define PATHOBJ(pathPtr) ((FsPath *) (TclFetchInternalRep((pathPtr), &fsPathType)->twoPtrValue.ptr1))
#define SETPATHOBJ(pathPtr,fsPathPtr) \
	do {							\
		Tcl_ObjInternalRep ir;				\
		ir.twoPtrValue.ptr1 = (void *) (fsPathPtr);	\
		ir.twoPtrValue.ptr2 = NULL;			\
		Tcl_StoreInternalRep((pathPtr), &fsPathType, &ir);	\
	} while (0)
#define PATHFLAGS(pathPtr) (PATHOBJ(pathPtr)->flags)

/*
 *---------------------------------------------------------------------------
 *

    TCL_OBJTYPE_V0
};

#define ProcSetInternalRep(objPtr, procPtr) \
    do {								\
	Tcl_ObjInternalRep ir;						\
	(procPtr)->refCount++;						\
	ir.twoPtrValue.ptr1 = (procPtr);				\
	ir.twoPtrValue.ptr2 = NULL;					\
	Tcl_StoreInternalRep((objPtr), &tclProcBodyType, &ir);		\
    } while (0)

#define ProcGetInternalRep(objPtr, procPtr) \
    do {								\
	const Tcl_ObjInternalRep *irPtr;				\
	irPtr = TclFetchInternalRep((objPtr), &tclProcBodyType);	\
	(procPtr) = irPtr ? (Proc *)irPtr->twoPtrValue.ptr1 : NULL;	\
    } while (0)

/*
 * The [upvar]/[uplevel] level reference type. Uses the wideValue field
 * to remember the integer value of a parsed #<integer> format.
 *
 * Uses the default behaviour throughout, and never disposes of the string

    SetLambdaFromAny,		/* setFromAnyProc */
    TCL_OBJTYPE_V0
};

#define LambdaSetInternalRep(objPtr, procPtr, nsObjPtr) \
    do {								\
	Tcl_ObjInternalRep ir;						\
	ir.twoPtrValue.ptr1 = (procPtr);				\
	ir.twoPtrValue.ptr2 = (nsObjPtr);				\
	Tcl_IncrRefCount((nsObjPtr));					\
	Tcl_StoreInternalRep((objPtr), &lambdaType, &ir);		\
    } while (0)

#define LambdaGetInternalRep(objPtr, procPtr, nsObjPtr) \
    do {								\
	const Tcl_ObjInternalRep *irPtr;				\
	irPtr = TclFetchInternalRep((objPtr), &lambdaType);		\
	(procPtr) = irPtr ? (Proc *)irPtr->twoPtrValue.ptr1 : NULL;	\
	(nsObjPtr) = irPtr ? (Tcl_Obj *)irPtr->twoPtrValue.ptr2 : NULL;	\
    } while (0)

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ProcObjCmd --
 *

    TCL_OBJTYPE_V0
};

#define RegexpSetInternalRep(objPtr, rePtr) \
    do {								\
	Tcl_ObjInternalRep ir;						\
	(rePtr)->refCount++;						\
	ir.twoPtrValue.ptr1 = (rePtr);					\
	ir.twoPtrValue.ptr2 = NULL;					\
	Tcl_StoreInternalRep((objPtr), &tclRegexpType, &ir);		\
    } while (0)

#define RegexpGetInternalRep(objPtr, rePtr) \
    do {								\
	const Tcl_ObjInternalRep *irPtr;				\
	irPtr = TclFetchInternalRep((objPtr), &tclRegexpType);		\
	(rePtr) = irPtr ? (TclRegexp *)irPtr->twoPtrValue.ptr1 : NULL;	\
    } while (0)

/*
 *----------------------------------------------------------------------
 *
 * Tcl_RegExpCompile --
 *


/* Is a Tcl_Obj (of right type) holding a smart pointer link? */
static inline int
IsLink(
    Tcl_Obj *objPtr)
{
    Tcl_ObjInternalRep *irPtr = &objPtr->internalRep;
    return irPtr->twoPtrValue.ptr1 && !irPtr->twoPtrValue.ptr2;
}

/* Follow links (smart pointers) if present. */
static inline Tcl_Obj *
FollowPossibleLink(
    Tcl_Obj *objPtr)
{
    if (IsLink(objPtr)) {
	objPtr = (Tcl_Obj *) objPtr->internalRep.twoPtrValue.ptr1;
    }
    /* assert(!IsLink(objPtr)); */
    return objPtr;
}

Tcl_Obj *
TclStrIdxTreeNewObj(void)
{
    Tcl_Obj *objPtr = Tcl_NewObj();
    TclStrIdxTree *tree = (TclStrIdxTree *) &objPtr->internalRep.twoPtrValue;

    /*
     * This assert states that we can safely directly have a tree node as the
     * internal representation of a Tcl_Obj instead of needing to hang it
     * off the back with an extra alloc.
     */
    TCL_CT_ASSERT(sizeof(TclStrIdxTree) <= sizeof(Tcl_ObjInternalRep));

    Tcl_Obj *srcPtr,
    Tcl_Obj *copyPtr)
{
    /* follow links (smart pointers) */
    srcPtr = FollowPossibleLink(srcPtr);

    /* create smart pointer to it (ptr1 != NULL, ptr2 = NULL) */
    TclInitObjRef(*((Tcl_Obj **) &copyPtr->internalRep.twoPtrValue.ptr1),
	    srcPtr);
    copyPtr->internalRep.twoPtrValue.ptr2 = NULL;
    copyPtr->typePtr = &StrIdxTreeObjType;
}

static void
StrIdxTreeObj_FreeIntRepProc(
    Tcl_Obj *objPtr)
{
    /* follow links (smart pointers) */
    if (IsLink(objPtr)) {
	/* is a link */
	TclUnsetObjRef(*((Tcl_Obj **) &objPtr->internalRep.twoPtrValue.ptr1));
    } else {
	/* is a tree */
	TclStrIdxTree *tree = (TclStrIdxTree *) &objPtr->internalRep.twoPtrValue;

	if (tree->firstPtr != NULL) {
	    TclStrIdxTreeFree(tree->firstPtr);
	}
	tree->firstPtr = NULL;
	tree->lastPtr = NULL;
    }

	return NULL;
    }

    /* follow links (smart pointers) */
    objPtr = FollowPossibleLink(objPtr);

    /* return tree root in internal representation */
    return (TclStrIdxTree *) &objPtr->internalRep.twoPtrValue;
}

/*
 * Several debug primitives
 */
#ifdef TEST_STR_IDX_TREE
/* currently unused, debug resp. test purposes only */

#define stringAlloc(numChars) \
    (String *) Tcl_Alloc(STRING_SIZE(numChars))
#define stringRealloc(ptr, numChars) \
    (String *) Tcl_Realloc((ptr), STRING_SIZE(numChars))
#define stringAttemptRealloc(ptr, numChars) \
    (String *) Tcl_AttemptRealloc((ptr), STRING_SIZE(numChars))
#define GET_STRING(objPtr) \
    ((String *) (objPtr)->internalRep.twoPtrValue.ptr1)
#define SET_STRING(objPtr, stringPtr) \
    ((objPtr)->internalRep.twoPtrValue.ptr2 = NULL),			\
    ((objPtr)->internalRep.twoPtrValue.ptr1 = (void *) (stringPtr))

#endif /*  _TCLSTRINGREP */
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78

    if (objc > 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "?string?");
	return TCL_ERROR;
    }
    objPtr = Tcl_NewObj();
    /*
    objPtr->internalRep.twoPtrValue.ptr1 = NULL;
    objPtr->internalRep.twoPtrValue.ptr2 = NULL;
    */
    memset(&objPtr->internalRep, 0, sizeof(objPtr->internalRep));
    if (objc == 2) {
	const char *s = Tcl_GetString(objv[1]);
	objPtr->length = objv[1]->length;
	objPtr->bytes = (char *)Tcl_Alloc(objPtr->length + 1);
	memcpy(objPtr->bytes, s, objPtr->length);

static int
my_LStringObjIndex(
    Tcl_Interp *interp,
    Tcl_Obj *lstringObj,
    Tcl_Size index,
    Tcl_Obj **charObjPtr)
{
    LString *lstringRepPtr = (LString*)lstringObj->internalRep.twoPtrValue.ptr1;

  (void)interp;

  if (index < lstringRepPtr->strlen) {
      char cchar[2];
      cchar[0] = lstringRepPtr->string[index];
      cchar[1] = 0;

 *
 *----------------------------------------------------------------------
 */

static Tcl_Size
my_LStringObjLength(Tcl_Obj *lstringObjPtr)
{
    LString *lstringRepPtr = (LString *)lstringObjPtr->internalRep.twoPtrValue.ptr1;
    return lstringRepPtr->strlen;
}


/*
 *----------------------------------------------------------------------
 *

 *
 *----------------------------------------------------------------------
 */

static void
DupLStringRep(Tcl_Obj *srcPtr, Tcl_Obj *copyPtr)
{
  LString *srcLString = (LString*)srcPtr->internalRep.twoPtrValue.ptr1;
  LString *copyLString = (LString*)Tcl_Alloc(sizeof(LString));

  memcpy(copyLString, srcLString, sizeof(LString));
  copyLString->string = (char*)Tcl_Alloc(srcLString->allocated);
  strncpy(copyLString->string, srcLString->string, srcLString->strlen);
  copyLString->string[srcLString->strlen] = '\0';
  copyLString->elements = NULL;
  Tcl_ObjInternalRep itr;
  itr.twoPtrValue.ptr1 = copyLString;
  itr.twoPtrValue.ptr2 = NULL;
  Tcl_StoreInternalRep(copyPtr, srcPtr->typePtr, &itr);

  return;
}

/*
 *----------------------------------------------------------------------

my_LStringObjSetElem(
    Tcl_Interp *interp,
    Tcl_Obj *lstringObj,
    Tcl_Size numIndicies,
    Tcl_Obj *const indicies[],
    Tcl_Obj *valueObj)
{
    LString *lstringRepPtr = (LString*)lstringObj->internalRep.twoPtrValue.ptr1;
    Tcl_Size index;
    int status;
    Tcl_Obj *returnObj;

    if (numIndicies > 1) {
	Tcl_SetObjResult(interp,
	    Tcl_ObjPrintf("Multiple indicies not supported by lstring."));
	return NULL;
    }

    status = Tcl_GetIntForIndex(interp, indicies[0], lstringRepPtr->strlen, &index);
    if (status != TCL_OK) {
	return NULL;
    }

    returnObj = Tcl_IsShared(lstringObj) ? Tcl_DuplicateObj(lstringObj) : lstringObj;
    lstringRepPtr = (LString*)returnObj->internalRep.twoPtrValue.ptr1;

    if (index >= lstringRepPtr->strlen) {
	index = lstringRepPtr->strlen;
	lstringRepPtr->strlen++;
	lstringRepPtr->string = (char*)Tcl_Realloc(lstringRepPtr->string, lstringRepPtr->strlen+1);
    }

    Tcl_Interp *interp,
    Tcl_Obj *lstringObj,
    Tcl_Size fromIdx,
    Tcl_Size toIdx,
    Tcl_Obj **newObjPtr)
{
    Tcl_Obj *rangeObj;
    LString *lstringRepPtr = (LString*)lstringObj->internalRep.twoPtrValue.ptr1;
    LString *rangeRep;
    Tcl_WideInt len = toIdx - fromIdx + 1;

    if (lstringRepPtr->strlen < fromIdx ||
	lstringRepPtr->strlen < toIdx) {
	Tcl_SetObjResult(interp,
	    Tcl_ObjPrintf("Range out of bounds "));

	rangeRep->strlen = len;
	rangeRep->string = (char*)Tcl_Alloc(rangeRep->allocated);
	strncpy(rangeRep->string,&lstringRepPtr->string[fromIdx],len);
	rangeRep->string[len] = 0;
	rangeRep->elements = NULL;
	rangeObj = Tcl_NewObj();
	Tcl_ObjInternalRep itr;
	itr.twoPtrValue.ptr1 = rangeRep;
	itr.twoPtrValue.ptr2 = NULL;
	Tcl_StoreInternalRep(rangeObj, lstringObj->typePtr, &itr);
	if (rangeRep->strlen > 0) {
	    Tcl_InvalidateStringRep(rangeObj);
	} else {
	    Tcl_InitStringRep(rangeObj, NULL, 0);
	}
	*newObjPtr = rangeObj;

 *
 *----------------------------------------------------------------------
 */

static int
my_LStringObjReverse(Tcl_Interp *interp, Tcl_Obj *srcObj, Tcl_Obj **newObjPtr)
{
    LString *srcRep = (LString*)srcObj->internalRep.twoPtrValue.ptr1;
    Tcl_Obj *revObj;
    LString *revRep = (LString*)Tcl_Alloc(sizeof(LString));
    Tcl_ObjInternalRep itr;
    Tcl_Size len;
    char *srcp, *dstp, *endp;
    (void)interp;
    len = srcRep->strlen;
    revRep->strlen = len;
    revRep->allocated = len+1;
    revRep->string = (char*)Tcl_Alloc(revRep->allocated);
    revRep->elements = NULL;
    srcp = srcRep->string;
    endp = &srcRep->string[len];
    dstp = &revRep->string[len];
    *dstp-- = 0;
    while (srcp < endp) {
	*dstp-- = *srcp++;
    }
    revObj = Tcl_NewObj();
    itr.twoPtrValue.ptr1 = revRep;
    itr.twoPtrValue.ptr2 = NULL;
    Tcl_StoreInternalRep(revObj, srcObj->typePtr, &itr);
    if (revRep->strlen > 0) {
	Tcl_InvalidateStringRep(revObj);
    } else {
	Tcl_InitStringRep(revObj, NULL, 0);
    }
    *newObjPtr = revObj;

    Tcl_Interp *interp,
    Tcl_Obj *listObj,
    Tcl_Size first,
    Tcl_Size numToDelete,
    Tcl_Size numToInsert,
    Tcl_Obj *const insertObjs[])
{
    LString *lstringRep = (LString*)listObj->internalRep.twoPtrValue.ptr1;
    Tcl_Size newLen;
    Tcl_Size x, ix, kx;
    char *newStr;
    char *oldStr = lstringRep->string;
    (void)interp;

    newLen = lstringRep->strlen - numToDelete + numToInsert;

    lstringRepPtr->strlen = strlen(string);
    lstringRepPtr->allocated = lstringRepPtr->strlen + 1;
    lstringRepPtr->string = (char*)Tcl_Alloc(lstringRepPtr->allocated);
    strcpy(lstringRepPtr->string, string);
    lstringRepPtr->elements = NULL;
    lstringPtr = Tcl_NewObj();
    itr.twoPtrValue.ptr1 = lstringRepPtr;
    itr.twoPtrValue.ptr2 = NULL;
    Tcl_StoreInternalRep(lstringPtr, lstringTypePtr, &itr);
    if (lstringRepPtr->strlen > 0) {
	Tcl_InvalidateStringRep(lstringPtr);
    } else {
	Tcl_InitStringRep(lstringPtr, NULL, 0);
    }
    return lstringPtr;

 *      Free the element array
 *
 */

static void
lstringFreeElements(Tcl_Obj* lstringObj)
{
    LString *lstringRepPtr = (LString*)lstringObj->internalRep.twoPtrValue.ptr1;
    if (lstringRepPtr->elements) {
	Tcl_Obj **objptr = lstringRepPtr->elements;
	while (objptr < &lstringRepPtr->elements[lstringRepPtr->strlen]) {
	    Tcl_DecrRefCount(*objptr++);
	}
	Tcl_Free((char*)lstringRepPtr->elements);
	lstringRepPtr->elements = NULL;

 *
 *----------------------------------------------------------------------
 */

static void
freeRep(Tcl_Obj* lstringObj)
{
    LString *lstringRepPtr = (LString*)lstringObj->internalRep.twoPtrValue.ptr1;
    if (lstringRepPtr->string) {
	Tcl_Free(lstringRepPtr->string);
    }
    lstringFreeElements(lstringObj);
    Tcl_Free((char*)lstringRepPtr);
    lstringObj->internalRep.twoPtrValue.ptr1 = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * my_LStringGetElements --
 *

 */

static int my_LStringGetElements(Tcl_Interp *interp,
				 Tcl_Obj *lstringObj,
				 Tcl_Size *objcptr,
				 Tcl_Obj ***objvptr)
{
    LString *lstringRepPtr = (LString*)lstringObj->internalRep.twoPtrValue.ptr1;
    Tcl_Obj **objPtr;
    char *cptr = lstringRepPtr->string;
    (void)interp;
    if (lstringRepPtr->strlen == 0) {
	*objcptr = 0;
	*objvptr = NULL;
	return TCL_OK;

 * The provided funtion computes the value for a give index
 */
static Tcl_Obj*
lgen(
    Tcl_Obj* objPtr,
    Tcl_Size index)
{
    LgenSeries *lgenSeriesPtr = (LgenSeries*)objPtr->internalRep.twoPtrValue.ptr1;
    Tcl_Obj *elemObj = NULL;
    Tcl_Interp *intrp = lgenSeriesPtr->interp;
    Tcl_Obj *genCmd = lgenSeriesPtr->genFnObj;
    Tcl_Size endidx = lgenSeriesPtr->nargs-1;

    if (0 <= index && index < lgenSeriesPtr->len) {
	Tcl_Obj *indexObj = Tcl_NewWideIntObj(index);

/*
 *  Abstract List Length function
 */
static Tcl_Size
lgenSeriesObjLength(Tcl_Obj *objPtr)
{
    LgenSeries *lgenSeriesRepPtr = (LgenSeries *)objPtr->internalRep.twoPtrValue.ptr1;
    return lgenSeriesRepPtr->len;
}

/*
 *  Abstract List Index function
 */
static int
lgenSeriesObjIndex(
    Tcl_Interp *interp,
    Tcl_Obj *lgenSeriesObjPtr,
    Tcl_Size index,
    Tcl_Obj **elemPtr)
{
    LgenSeries *lgenSeriesRepPtr;
    Tcl_Obj *element;

    lgenSeriesRepPtr = (LgenSeries*)lgenSeriesObjPtr->internalRep.twoPtrValue.ptr1;

    if (index < 0 || index >= lgenSeriesRepPtr->len) {
	*elemPtr = NULL;
	return TCL_OK;
    }
    if (lgenSeriesRepPtr->interp == NULL && interp == NULL) {
	return TCL_ERROR;

{
    LgenSeries *lgenSeriesRepPtr;
    Tcl_Obj *element;
    Tcl_Size i;
    size_t bytlen;
    Tcl_Obj *tmpstr = Tcl_NewObj();

    lgenSeriesRepPtr = (LgenSeries*)objPtr->internalRep.twoPtrValue.ptr1;

    for (i=0, bytlen=0; i<lgenSeriesRepPtr->len; i++) {
	element = lgen(objPtr, i);
	if (element) {
	    if (i) {
		Tcl_AppendToObj(tmpstr," ",1);
	    }

/*
 *  ObjType Free Internal Rep function
 */
static void
FreeLgenInternalRep(Tcl_Obj *objPtr)
{
    LgenSeries *lgenSeries = (LgenSeries*)objPtr->internalRep.twoPtrValue.ptr1;
    if (lgenSeries->genFnObj) {
	Tcl_DecrRefCount(lgenSeries->genFnObj);
    }
    lgenSeries->interp = NULL;
    Tcl_Free(lgenSeries);
    objPtr->internalRep.twoPtrValue.ptr1 = 0;
}

static void DupLgenSeriesRep(Tcl_Obj *srcPtr, Tcl_Obj *copyPtr);

/*
 *  Abstract List ObjType definition
 */

 *  ObjType Duplicate Internal Rep Function
 */
static void
DupLgenSeriesRep(
    Tcl_Obj *srcPtr,
    Tcl_Obj *copyPtr)
{
    LgenSeries *srcLgenSeries = (LgenSeries*)srcPtr->internalRep.twoPtrValue.ptr1;
    Tcl_Size repSize = sizeof(LgenSeries);
    LgenSeries *copyLgenSeries = (LgenSeries*)Tcl_Alloc(repSize);

    copyLgenSeries->interp = srcLgenSeries->interp;
    copyLgenSeries->nargs = srcLgenSeries->nargs;
    copyLgenSeries->len = srcLgenSeries->len;
    copyLgenSeries->genFnObj = Tcl_DuplicateObj(srcLgenSeries->genFnObj);
    Tcl_IncrRefCount(copyLgenSeries->genFnObj);
    copyPtr->typePtr = &lgenType;
    copyPtr->internalRep.twoPtrValue.ptr1 = copyLgenSeries;
    copyPtr->internalRep.twoPtrValue.ptr2 = NULL;
    return;
}

/*
 *  Create a new lgen Tcl_Obj
 */
Tcl_Obj *

    // argsv         0   1    2    3   ... index

    lGenSeriesRepPtr->nargs = objc;
    lGenSeriesRepPtr->genFnObj = Tcl_NewListObj(objc-1, objv+1);
    // Addd 0 placeholder for index
    Tcl_ListObjAppendElement(interp, lGenSeriesRepPtr->genFnObj, Tcl_NewIntObj(0));
    Tcl_IncrRefCount(lGenSeriesRepPtr->genFnObj);
    lGenSeriesObj->internalRep.twoPtrValue.ptr1 = lGenSeriesRepPtr;
    lGenSeriesObj->internalRep.twoPtrValue.ptr2 = NULL;
    lGenSeriesObj->typePtr = &lgenType;

    if (length > 0) {
	Tcl_InvalidateStringRep(lGenSeriesObj);
    } else {
	Tcl_InitStringRep(lGenSeriesObj, NULL, 0);
    }

	 */

	if (Tcl_GetIntForIndex(interp, objv[2], TCL_INDEX_NONE, &index2) != TCL_OK) {
	    return TCL_ERROR;
	}

	Tcl_GetIndexFromObj(NULL, objv[1], tablePtr, "token", 0, &index);
	indexRep = (struct IndexRep *)objv[1]->internalRep.twoPtrValue.ptr1;
	indexRep->index = index2;
	result = Tcl_GetIndexFromObj(NULL, objv[1],
		tablePtr, "token", 0, &index);
	if (result == TCL_OK) {
	    Tcl_SetWideIntObj(Tcl_GetObjResult(interp), index);
	}
	return result;

	case 5:				/* length2 */
	    if (objc != 3) {
		goto wrongNumArgs;
	    }
	    if (varPtr[varIndex] != NULL) {
		Tcl_ConvertToType(NULL, varPtr[varIndex],
			Tcl_GetObjType("string"));
		strPtr = (String *)varPtr[varIndex]->internalRep.twoPtrValue.ptr1;
		length = strPtr->allocated;
	    } else {
		length = TCL_INDEX_NONE;
	    }
	    Tcl_SetWideIntObj(Tcl_GetObjResult(interp), (Tcl_WideInt)((Tcl_WideUInt)(length + 1U)) - 1);
	    break;
	case 6:				/* set */

	case 9:				/* maxchars */
	    if (objc != 3) {
		goto wrongNumArgs;
	    }
	    if (varPtr[varIndex] != NULL) {
		Tcl_ConvertToType(NULL, varPtr[varIndex],
			Tcl_GetObjType("string"));
		strPtr = (String *)varPtr[varIndex]->internalRep.twoPtrValue.ptr1;
		length = strPtr->maxChars;
	    } else {
		length = TCL_INDEX_NONE;
	    }
	    Tcl_SetWideIntObj(Tcl_GetObjResult(interp), length);
	    break;
	case 10: {				/* range */

	    newObjsPtr = (Tcl_Obj *)TclpSysAlloc(sizeof(Tcl_Obj) * numMove);
	    if (newObjsPtr == NULL) {
		Tcl_Panic("alloc: could not allocate %" TCL_Z_MODIFIER "u new objects", numMove);
	    }
	    cachePtr->lastPtr = newObjsPtr + numMove - 1;
	    objPtr = cachePtr->firstObjPtr;	/* NULL */
	    while (numMove-- > 0) {
		newObjsPtr[numMove].internalRep.twoPtrValue.ptr1 = objPtr;
		objPtr = newObjsPtr + numMove;
	    }
	    cachePtr->firstObjPtr = newObjsPtr;
	}
    }

    /*
     * Pop the first object.
     */

    objPtr = cachePtr->firstObjPtr;
    cachePtr->firstObjPtr = (Tcl_Obj *)objPtr->internalRep.twoPtrValue.ptr1;
    cachePtr->numObjects--;
    return objPtr;
}

/*
 *----------------------------------------------------------------------
 *

    GETCACHE(cachePtr);

    /*
     * Get this thread's list and push on the free Tcl_Obj.
     */

    objPtr->internalRep.twoPtrValue.ptr1 = cachePtr->firstObjPtr;
    cachePtr->firstObjPtr = objPtr;
    if (cachePtr->numObjects == 0) {
	cachePtr->lastPtr = objPtr;
    }
    cachePtr->numObjects++;

    /*

    /*
     * Find the last object to be moved; set the next one (the first one not
     * to be moved) as the first object in the 'from' cache.
     */

    while (numMove-- > 1) {
	objPtr = (Tcl_Obj *)objPtr->internalRep.twoPtrValue.ptr1;
    }
    fromPtr->firstObjPtr = (Tcl_Obj *)objPtr->internalRep.twoPtrValue.ptr1;

    /*
     * Move all objects as a block - they are already linked to each other, we
     * just have to update the first and last.
     */

    toPtr->lastPtr = objPtr;
    objPtr->internalRep.twoPtrValue.ptr1 = toPtr->firstObjPtr; /* NULL */
    toPtr->firstObjPtr = fromFirstObjPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * PutObjs --

    fromPtr->numObjects = keep;
    firstPtr = fromPtr->firstObjPtr;
    if (keep == 0) {
	fromPtr->firstObjPtr = NULL;
    } else {
	do {
	    lastPtr = firstPtr;
	    firstPtr = (Tcl_Obj *)firstPtr->internalRep.twoPtrValue.ptr1;
	} while (keep-- > 1);
	lastPtr->internalRep.twoPtrValue.ptr1 = NULL;
    }

    /*
     * Move all objects as a block - they are already linked to each other, we
     * just have to update the first and last.
     */

    Tcl_MutexLock(objLockPtr);
    fromPtr->lastPtr->internalRep.twoPtrValue.ptr1 = sharedPtr->firstObjPtr;
    sharedPtr->firstObjPtr = firstPtr;
    if (sharedPtr->numObjects == 0) {
	sharedPtr->lastPtr = fromPtr->lastPtr;
    }
    sharedPtr->numObjects += numMove;
    Tcl_MutexUnlock(objLockPtr);

static Tcl_FreeInternalRepProc	FreeParsedVarName;
static Tcl_DupInternalRepProc	DupParsedVarName;

/*
 * Types of Tcl_Objs used to cache variable lookups.
 *
 * localVarName - INTERNALREP DEFINITION:
 *   twoPtrValue.ptr1:   pointer to name obj in varFramePtr->localCache
 *			  or NULL if it is this same obj
 *   twoPtrValue.ptr2: index into locals table
 *
 * parsedVarName - INTERNALREP DEFINITION:
 *   twoPtrValue.ptr1:	pointer to the array name Tcl_Obj, or NULL if it is a
 *			scalar variable
 *   twoPtrValue.ptr2:	pointer to the element name string (owned by this
 *			Tcl_Obj), or NULL if it is a scalar variable
 */

static const Tcl_ObjType localVarNameType = {
    "localVarName",
    FreeLocalVarName, DupLocalVarName, NULL, NULL,
    TCL_OBJTYPE_V0
};

#define LocalSetInternalRep(objPtr, index, namePtr)			\
    do {								\
	Tcl_ObjInternalRep ir;						\
	Tcl_Obj *ptr = (namePtr);					\
	if (ptr) {Tcl_IncrRefCount(ptr);}				\
	ir.twoPtrValue.ptr1 = ptr;					\
	ir.twoPtrValue.ptr2 = INT2PTR(index);				\
	Tcl_StoreInternalRep((objPtr), &localVarNameType, &ir);		\
    } while (0)

#define LocalGetInternalRep(objPtr, index, name)			\
    do {								\
	const Tcl_ObjInternalRep *irPtr;				\
	irPtr = TclFetchInternalRep((objPtr), &localVarNameType);	\
	(name) = irPtr ? (Tcl_Obj *)irPtr->twoPtrValue.ptr1 : NULL;	\
	(index) = irPtr ? PTR2INT(irPtr->twoPtrValue.ptr2) : TCL_INDEX_NONE; \
    } while (0)

static const Tcl_ObjType parsedVarNameType = {
    "parsedVarName",
    FreeParsedVarName, DupParsedVarName, NULL, NULL,
    TCL_OBJTYPE_V0
};

#define ParsedSetInternalRep(objPtr, arrayPtr, elem)			\
    do {								\
	Tcl_ObjInternalRep ir;						\
	Tcl_Obj *ptr1 = (arrayPtr);					\
	Tcl_Obj *ptr2 = (elem);						\
	if (ptr1) {Tcl_IncrRefCount(ptr1);}				\
	if (ptr2) {Tcl_IncrRefCount(ptr2);}				\
	ir.twoPtrValue.ptr1 = ptr1;					\
	ir.twoPtrValue.ptr2 = ptr2;					\
	Tcl_StoreInternalRep((objPtr), &parsedVarNameType, &ir);	\
    } while (0)

#define ParsedGetInternalRep(objPtr, parsed, array, elem)		\
    do {								\
	const Tcl_ObjInternalRep *irPtr;				\
	irPtr = TclFetchInternalRep((objPtr), &parsedVarNameType);	\
	(parsed) = (irPtr != NULL);					\
	(array) = irPtr ? (Tcl_Obj *)irPtr->twoPtrValue.ptr1 : NULL;	\
	(elem) = irPtr ? (Tcl_Obj *)irPtr->twoPtrValue.ptr2 : NULL;	\
    } while (0)

Var *
TclVarHashCreateVar(
    TclVarHashTable *tablePtr,
    const char *key,
    int *newPtr)

 *----------------------------------------------------------------------
 */

/*
 * localVarName -
 *
 * INTERNALREP DEFINITION:
 *   twoPtrValue.ptr1:   pointer to name obj in varFramePtr->localCache
 *			  or NULL if it is this same obj
 *   twoPtrValue.ptr2: index into locals table
 */

static void
FreeLocalVarName(
    Tcl_Obj *objPtr)
{
    Tcl_Size index;

    LocalSetInternalRep(dupPtr, index, namePtr);
}

/*
 * parsedVarName -
 *
 * INTERNALREP DEFINITION:
 *   twoPtrValue.ptr1 = pointer to the array name Tcl_Obj (NULL if scalar)
 *   twoPtrValue.ptr2 = pointer to the element name string (owned by this
 *			Tcl_Obj), or NULL if it is a scalar variable
 */

static void
FreeParsedVarName(
    Tcl_Obj *objPtr)
{