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Overview
Comment:Make read and write operations on Tcl_Var handles available in tclInt API.

(This will be useful for tclquadcode, and it addresses a basic omission in Tcl's API that made working with Tcl_Vars rather more specialized than it was ever really intended to be. However, this also closes off the part of the API that was not reasonably usable by ordinary external code; LVT indices require too deep an entanglement into Tcl's implementation.)

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SHA1: 7d94f61c60d13596272d0854d25cf98f7024c693
User & Date: dkf 2017-06-08 20:49:04
Original Comment: Make read and write operations on Tcl_Var handles available in tclInt API.
Context
2017-06-14
21:49
[9c058c5803e30d02] Correction to cross linking in dict(n)'s SEE ALSO section. check-in: 98b22be0c4 user: dkf tags: core-8-6-branch
07:54
Rebase to core-8-6-branch (who told that fossil doesn't know how to rebase ....) check-in: ae4471b37c user: jan.nijtmans tags: bsg-0d-radix-prefix
2017-06-13
12:18
merge core-8-6-branch check-in: 8eec477ed9 user: jan.nijtmans tags: rfe-6c0d7aec67
2017-06-08
20:49
Make read and write operations on Tcl_Var handles available in tclInt API. check-in: 2487a9bc13 user: dkf tags: trunk
20:49
Make read and write operations on Tcl_Var handles available in tclInt API.

(This will be useful f... check-in: 7d94f61c60 user: dkf tags: core-8-6-branch

12:50
Revert part of [95d096e0378b460c6c5168bb55bb2ca8b2fd799e|95d096e037]: Missed the fact that tolower()... check-in: 9d00eb3607 user: jan.nijtmans tags: core-8-6-branch
2017-06-06
17:51
Expose some of the core variable access APIs. (Cherrypick from [b4dfc30083]) Closed-Leaf check-in: c4eb84f273 user: dkf tags: dkf-expose-ptrgetvar-8.6
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to generic/tclDictObj.c.

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    int i, allocdict, keyc;
    Tcl_Obj **keyv;

    /*
     * If the dictionary variable doesn't exist, drop everything silently.
     */

    dictPtr = TclPtrGetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
	    TCL_LEAVE_ERR_MSG, index);
    if (dictPtr == NULL) {
	return TCL_OK;
    }

    /*
     * Double-check that it is still a dictionary.
................................................................................
	InvalidateDictChain(leafPtr);
    }

    /*
     * Write back the outermost dictionary to the variable.
     */

    if (TclPtrSetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr, dictPtr,
	    TCL_LEAVE_ERR_MSG, index) == NULL) {
	if (allocdict) {
	    TclDecrRefCount(dictPtr);
	}
	return TCL_ERROR;
    }
    return TCL_OK;
}






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    int i, allocdict, keyc;
    Tcl_Obj **keyv;

    /*
     * If the dictionary variable doesn't exist, drop everything silently.
     */

    dictPtr = TclPtrGetVarIdx(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
	    TCL_LEAVE_ERR_MSG, index);
    if (dictPtr == NULL) {
	return TCL_OK;
    }

    /*
     * Double-check that it is still a dictionary.
................................................................................
	InvalidateDictChain(leafPtr);
    }

    /*
     * Write back the outermost dictionary to the variable.
     */

    if (TclPtrSetVarIdx(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
	    dictPtr, TCL_LEAVE_ERR_MSG, index) == NULL) {
	if (allocdict) {
	    TclDecrRefCount(dictPtr);
	}
	return TCL_ERROR;
    }
    return TCL_OK;
}

Changes to generic/tclExecute.c.

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    doCallPtrGetVar:
	/*
	 * There are either errors or the variable is traced: call
	 * TclPtrGetVar to process fully.
	 */

	DECACHE_STACK_INFO();
	objResultPtr = TclPtrGetVar(interp, varPtr, arrayPtr,
		part1Ptr, part2Ptr, TCL_LEAVE_ERR_MSG, opnd);
	CACHE_STACK_INFO();
	if (!objResultPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
................................................................................
	}
	cleanup = 1;
	arrayPtr = NULL;
	part1Ptr = part2Ptr = NULL;

    doCallPtrSetVar:
	DECACHE_STACK_INFO();
	objResultPtr = TclPtrSetVar(interp, varPtr, arrayPtr,
		part1Ptr, part2Ptr, valuePtr, storeFlags, opnd);
	CACHE_STACK_INFO();
	if (!objResultPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
#ifndef TCL_COMPILE_DEBUG
................................................................................
	if (TclIsVarInHash(varPtr)) {
	    VarHashRefCount(varPtr)++;
	}
	if (arrayPtr && TclIsVarInHash(arrayPtr)) {
	    VarHashRefCount(arrayPtr)++;
	}
	DECACHE_STACK_INFO();
	objResultPtr = TclPtrGetVar(interp, varPtr, arrayPtr,
		part1Ptr, part2Ptr, TCL_LEAVE_ERR_MSG, opnd);
	CACHE_STACK_INFO();
	if (TclIsVarInHash(varPtr)) {
	    VarHashRefCount(varPtr)--;
	}
	if (arrayPtr && TclIsVarInHash(arrayPtr)) {
	    VarHashRefCount(arrayPtr)--;
................................................................................
		}
		if (Tcl_ListObjReplace(interp, objResultPtr, len,0, objc,objv)
			!= TCL_OK) {
		    goto errorInLappendListPtr;
		}
	    }
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrSetVar(interp, varPtr, arrayPtr, part1Ptr,
		    part2Ptr, objResultPtr, TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    if (!objResultPtr) {
	    errorInLappendListPtr:
		if (createdNewObj) {
		    TclDecrRefCount(objResultPtr);
		}
................................................................................
		Tcl_DecrRefCount(incrPtr);
		TRACE_ERROR(interp);
		goto gotError;
	    }
	    Tcl_DecrRefCount(incrPtr);
	} else {
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrIncrObjVar(interp, varPtr, arrayPtr,
		    part1Ptr, part2Ptr, incrPtr, TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    Tcl_DecrRefCount(incrPtr);
	    if (objResultPtr == NULL) {
		TRACE_ERROR(interp);
		goto gotError;
	    }
................................................................................
	    varPtr->value.objPtr = NULL;
	    TRACE_APPEND(("OK\n"));
	    NEXT_INST_F(6, 0, 0);
	}

    slowUnsetScalar:
	DECACHE_STACK_INFO();
	if (TclPtrUnsetVar(interp, varPtr, NULL, NULL, NULL, flags,
		opnd) != TCL_OK && flags) {
	    goto errorInUnset;
	}
	CACHE_STACK_INFO();
	NEXT_INST_F(6, 0, 0);

    case INST_UNSET_ARRAY:
................................................................................
	DECACHE_STACK_INFO();
	varPtr = TclLookupArrayElement(interp, NULL, part2Ptr, flags, "unset",
		0, 0, arrayPtr, opnd);
	if (!varPtr) {
	    if (flags & TCL_LEAVE_ERR_MSG) {
		goto errorInUnset;
	    }
	} else if (TclPtrUnsetVar(interp, varPtr, arrayPtr, NULL, part2Ptr,
		flags, opnd) != TCL_OK && (flags & TCL_LEAVE_ERR_MSG)) {
	    goto errorInUnset;
	}
	CACHE_STACK_INFO();
	NEXT_INST_F(6, 1, 0);

    case INST_UNSET_ARRAY_STK:
................................................................................
	if (TclIsVarDirectUnsettable(varPtr) && !TclIsVarInHash(varPtr)) {
	    if (!TclIsVarUndefined(varPtr)) {
		TclDecrRefCount(varPtr->value.objPtr);
	    }
	    varPtr->value.objPtr = NULL;
	} else {
	    DECACHE_STACK_INFO();
	    TclPtrUnsetVar(interp, varPtr, NULL, NULL, NULL, 0, opnd);
	    CACHE_STACK_INFO();
	}
	NEXT_INST_F(5, 0, 0);
    }

    /*
     *	   End of INST_UNSET instructions.
................................................................................
		}
	    }
	    TclSetVarLink(varPtr);
	    varPtr->value.linkPtr = otherPtr;
	    if (TclIsVarInHash(otherPtr)) {
		VarHashRefCount(otherPtr)++;
	    }
	} else if (TclPtrObjMakeUpvar(interp, otherPtr, NULL, 0,
		opnd) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Do not pop the namespace or frame index, it may be needed for other
................................................................................
				TclDecrRefCount(value2Ptr);
			    }
			    varPtr->value.objPtr = valuePtr;
			    Tcl_IncrRefCount(valuePtr);
			}
		    } else {
			DECACHE_STACK_INFO();
			if (TclPtrSetVar(interp, varPtr, NULL, NULL, NULL,
				valuePtr, TCL_LEAVE_ERR_MSG, varIndex)==NULL){
			    CACHE_STACK_INFO();
			    TRACE_APPEND((
				    "ERROR init. index temp %d: %s\n",
				    varIndex, O2S(Tcl_GetObjResult(interp))));
			    TclDecrRefCount(listPtr);
			    goto gotError;
................................................................................
				TclDecrRefCount(value2Ptr);
			    }
			    varPtr->value.objPtr = valuePtr;
			    Tcl_IncrRefCount(valuePtr);
			}
		    } else {
			DECACHE_STACK_INFO();
			if (TclPtrSetVar(interp, varPtr, NULL, NULL, NULL,
				valuePtr, TCL_LEAVE_ERR_MSG, varIndex)==NULL){
			    CACHE_STACK_INFO();
			    TRACE_APPEND(("ERROR init. index temp %d: %.30s",
				    varIndex, O2S(Tcl_GetObjResult(interp))));
			    goto gotError;
			}
			CACHE_STACK_INFO();
................................................................................
	    varPtr = varPtr->value.linkPtr;
	}
	TRACE(("%u %u => ", opnd, opnd2));
	if (TclIsVarDirectReadable(varPtr)) {
	    dictPtr = varPtr->value.objPtr;
	} else {
	    DECACHE_STACK_INFO();
	    dictPtr = TclPtrGetVar(interp, varPtr, NULL,NULL,NULL, 0, opnd2);

	    CACHE_STACK_INFO();
	}
	if (dictPtr == NULL) {
	    TclNewObj(dictPtr);
	    allocateDict = 1;
	} else {
	    allocateDict = Tcl_IsShared(dictPtr);
................................................................................
		}
		varPtr->value.objPtr = dictPtr;
	    }
	    objResultPtr = dictPtr;
	} else {
	    Tcl_IncrRefCount(dictPtr);
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrSetVar(interp, varPtr, NULL, NULL, NULL,
		    dictPtr, TCL_LEAVE_ERR_MSG, opnd2);
	    CACHE_STACK_INFO();
	    TclDecrRefCount(dictPtr);
	    if (objResultPtr == NULL) {
		TRACE_ERROR(interp);
		goto gotError;
	    }
................................................................................
	    varPtr = varPtr->value.linkPtr;
	}
	TRACE(("%u => ", opnd));
	if (TclIsVarDirectReadable(varPtr)) {
	    dictPtr = varPtr->value.objPtr;
	} else {
	    DECACHE_STACK_INFO();
	    dictPtr = TclPtrGetVar(interp, varPtr, NULL, NULL, NULL, 0, opnd);

	    CACHE_STACK_INFO();
	}
	if (dictPtr == NULL) {
	    TclNewObj(dictPtr);
	    allocateDict = 1;
	} else {
	    allocateDict = Tcl_IsShared(dictPtr);
................................................................................
		}
		varPtr->value.objPtr = dictPtr;
	    }
	    objResultPtr = dictPtr;
	} else {
	    Tcl_IncrRefCount(dictPtr);
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrSetVar(interp, varPtr, NULL, NULL, NULL,
		    dictPtr, TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    TclDecrRefCount(dictPtr);
	    if (objResultPtr == NULL) {
		TRACE_ERROR(interp);
		goto gotError;
	    }
................................................................................
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	if (TclIsVarDirectReadable(varPtr)) {
	    dictPtr = varPtr->value.objPtr;
	} else {
	    DECACHE_STACK_INFO();
	    dictPtr = TclPtrGetVar(interp, varPtr, NULL, NULL, NULL,
		    TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    if (dictPtr == NULL) {
		TRACE_ERROR(interp);
		goto gotError;
	    }
	}
................................................................................
		varPtr = varPtr->value.linkPtr;
	    }
	    DECACHE_STACK_INFO();
	    if (valuePtr == NULL) {
		TclObjUnsetVar2(interp,
			localName(iPtr->varFramePtr, duiPtr->varIndices[i]),
			NULL, 0);
	    } else if (TclPtrSetVar(interp, varPtr, NULL, NULL, NULL,
		    valuePtr, TCL_LEAVE_ERR_MSG,
		    duiPtr->varIndices[i]) == NULL) {
		CACHE_STACK_INFO();
		TRACE_ERROR(interp);
		Tcl_DecrRefCount(dictPtr);
		goto gotError;
	    }
................................................................................
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	if (TclIsVarDirectReadable(varPtr)) {
	    dictPtr = varPtr->value.objPtr;
	} else {
	    DECACHE_STACK_INFO();
	    dictPtr = TclPtrGetVar(interp, varPtr, NULL, NULL, NULL, 0, opnd);

	    CACHE_STACK_INFO();
	}
	if (dictPtr == NULL) {
	    TRACE_APPEND(("storage was unset\n"));
	    NEXT_INST_F(9, 1, 0);
	}
	if (Tcl_DictObjSize(interp, dictPtr, &length) != TCL_OK
................................................................................
	    while (TclIsVarLink(var2Ptr)) {
		var2Ptr = var2Ptr->value.linkPtr;
	    }
	    if (TclIsVarDirectReadable(var2Ptr)) {
		valuePtr = var2Ptr->value.objPtr;
	    } else {
		DECACHE_STACK_INFO();
		valuePtr = TclPtrGetVar(interp, var2Ptr, NULL, NULL, NULL, 0,
			duiPtr->varIndices[i]);
		CACHE_STACK_INFO();
	    }
	    if (valuePtr == NULL) {
		Tcl_DictObjRemove(interp, dictPtr, keyPtrPtr[i]);
	    } else if (dictPtr == valuePtr) {
		Tcl_DictObjPut(interp, dictPtr, keyPtrPtr[i],
			Tcl_DuplicateObj(valuePtr));
................................................................................
	}
	if (TclIsVarDirectWritable(varPtr)) {
	    Tcl_IncrRefCount(dictPtr);
	    TclDecrRefCount(varPtr->value.objPtr);
	    varPtr->value.objPtr = dictPtr;
	} else {
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrSetVar(interp, varPtr, NULL, NULL, NULL,
		    dictPtr, TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    if (objResultPtr == NULL) {
		if (allocdict) {
		    TclDecrRefCount(dictPtr);
		}
		TRACE_ERROR(interp);






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    doCallPtrGetVar:
	/*
	 * There are either errors or the variable is traced: call
	 * TclPtrGetVar to process fully.
	 */

	DECACHE_STACK_INFO();
	objResultPtr = TclPtrGetVarIdx(interp, varPtr, arrayPtr,
		part1Ptr, part2Ptr, TCL_LEAVE_ERR_MSG, opnd);
	CACHE_STACK_INFO();
	if (!objResultPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
	TRACE_APPEND(("%.30s\n", O2S(objResultPtr)));
................................................................................
	}
	cleanup = 1;
	arrayPtr = NULL;
	part1Ptr = part2Ptr = NULL;

    doCallPtrSetVar:
	DECACHE_STACK_INFO();
	objResultPtr = TclPtrSetVarIdx(interp, varPtr, arrayPtr,
		part1Ptr, part2Ptr, valuePtr, storeFlags, opnd);
	CACHE_STACK_INFO();
	if (!objResultPtr) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}
#ifndef TCL_COMPILE_DEBUG
................................................................................
	if (TclIsVarInHash(varPtr)) {
	    VarHashRefCount(varPtr)++;
	}
	if (arrayPtr && TclIsVarInHash(arrayPtr)) {
	    VarHashRefCount(arrayPtr)++;
	}
	DECACHE_STACK_INFO();
	objResultPtr = TclPtrGetVarIdx(interp, varPtr, arrayPtr,
		part1Ptr, part2Ptr, TCL_LEAVE_ERR_MSG, opnd);
	CACHE_STACK_INFO();
	if (TclIsVarInHash(varPtr)) {
	    VarHashRefCount(varPtr)--;
	}
	if (arrayPtr && TclIsVarInHash(arrayPtr)) {
	    VarHashRefCount(arrayPtr)--;
................................................................................
		}
		if (Tcl_ListObjReplace(interp, objResultPtr, len,0, objc,objv)
			!= TCL_OK) {
		    goto errorInLappendListPtr;
		}
	    }
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrSetVarIdx(interp, varPtr, arrayPtr, part1Ptr,
		    part2Ptr, objResultPtr, TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    if (!objResultPtr) {
	    errorInLappendListPtr:
		if (createdNewObj) {
		    TclDecrRefCount(objResultPtr);
		}
................................................................................
		Tcl_DecrRefCount(incrPtr);
		TRACE_ERROR(interp);
		goto gotError;
	    }
	    Tcl_DecrRefCount(incrPtr);
	} else {
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrIncrObjVarIdx(interp, varPtr, arrayPtr,
		    part1Ptr, part2Ptr, incrPtr, TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    Tcl_DecrRefCount(incrPtr);
	    if (objResultPtr == NULL) {
		TRACE_ERROR(interp);
		goto gotError;
	    }
................................................................................
	    varPtr->value.objPtr = NULL;
	    TRACE_APPEND(("OK\n"));
	    NEXT_INST_F(6, 0, 0);
	}

    slowUnsetScalar:
	DECACHE_STACK_INFO();
	if (TclPtrUnsetVarIdx(interp, varPtr, NULL, NULL, NULL, flags,
		opnd) != TCL_OK && flags) {
	    goto errorInUnset;
	}
	CACHE_STACK_INFO();
	NEXT_INST_F(6, 0, 0);

    case INST_UNSET_ARRAY:
................................................................................
	DECACHE_STACK_INFO();
	varPtr = TclLookupArrayElement(interp, NULL, part2Ptr, flags, "unset",
		0, 0, arrayPtr, opnd);
	if (!varPtr) {
	    if (flags & TCL_LEAVE_ERR_MSG) {
		goto errorInUnset;
	    }
	} else if (TclPtrUnsetVarIdx(interp, varPtr, arrayPtr, NULL, part2Ptr,
		flags, opnd) != TCL_OK && (flags & TCL_LEAVE_ERR_MSG)) {
	    goto errorInUnset;
	}
	CACHE_STACK_INFO();
	NEXT_INST_F(6, 1, 0);

    case INST_UNSET_ARRAY_STK:
................................................................................
	if (TclIsVarDirectUnsettable(varPtr) && !TclIsVarInHash(varPtr)) {
	    if (!TclIsVarUndefined(varPtr)) {
		TclDecrRefCount(varPtr->value.objPtr);
	    }
	    varPtr->value.objPtr = NULL;
	} else {
	    DECACHE_STACK_INFO();
	    TclPtrUnsetVarIdx(interp, varPtr, NULL, NULL, NULL, 0, opnd);
	    CACHE_STACK_INFO();
	}
	NEXT_INST_F(5, 0, 0);
    }

    /*
     *	   End of INST_UNSET instructions.
................................................................................
		}
	    }
	    TclSetVarLink(varPtr);
	    varPtr->value.linkPtr = otherPtr;
	    if (TclIsVarInHash(otherPtr)) {
		VarHashRefCount(otherPtr)++;
	    }
	} else if (TclPtrObjMakeUpvarIdx(interp, otherPtr, NULL, 0,
		opnd) != TCL_OK) {
	    TRACE_ERROR(interp);
	    goto gotError;
	}

	/*
	 * Do not pop the namespace or frame index, it may be needed for other
................................................................................
				TclDecrRefCount(value2Ptr);
			    }
			    varPtr->value.objPtr = valuePtr;
			    Tcl_IncrRefCount(valuePtr);
			}
		    } else {
			DECACHE_STACK_INFO();
			if (TclPtrSetVarIdx(interp, varPtr, NULL, NULL, NULL,
				valuePtr, TCL_LEAVE_ERR_MSG, varIndex)==NULL){
			    CACHE_STACK_INFO();
			    TRACE_APPEND((
				    "ERROR init. index temp %d: %s\n",
				    varIndex, O2S(Tcl_GetObjResult(interp))));
			    TclDecrRefCount(listPtr);
			    goto gotError;
................................................................................
				TclDecrRefCount(value2Ptr);
			    }
			    varPtr->value.objPtr = valuePtr;
			    Tcl_IncrRefCount(valuePtr);
			}
		    } else {
			DECACHE_STACK_INFO();
			if (TclPtrSetVarIdx(interp, varPtr, NULL, NULL, NULL,
				valuePtr, TCL_LEAVE_ERR_MSG, varIndex)==NULL){
			    CACHE_STACK_INFO();
			    TRACE_APPEND(("ERROR init. index temp %d: %.30s",
				    varIndex, O2S(Tcl_GetObjResult(interp))));
			    goto gotError;
			}
			CACHE_STACK_INFO();
................................................................................
	    varPtr = varPtr->value.linkPtr;
	}
	TRACE(("%u %u => ", opnd, opnd2));
	if (TclIsVarDirectReadable(varPtr)) {
	    dictPtr = varPtr->value.objPtr;
	} else {
	    DECACHE_STACK_INFO();
	    dictPtr = TclPtrGetVarIdx(interp, varPtr, NULL, NULL, NULL, 0,
		    opnd2);
	    CACHE_STACK_INFO();
	}
	if (dictPtr == NULL) {
	    TclNewObj(dictPtr);
	    allocateDict = 1;
	} else {
	    allocateDict = Tcl_IsShared(dictPtr);
................................................................................
		}
		varPtr->value.objPtr = dictPtr;
	    }
	    objResultPtr = dictPtr;
	} else {
	    Tcl_IncrRefCount(dictPtr);
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrSetVarIdx(interp, varPtr, NULL, NULL, NULL,
		    dictPtr, TCL_LEAVE_ERR_MSG, opnd2);
	    CACHE_STACK_INFO();
	    TclDecrRefCount(dictPtr);
	    if (objResultPtr == NULL) {
		TRACE_ERROR(interp);
		goto gotError;
	    }
................................................................................
	    varPtr = varPtr->value.linkPtr;
	}
	TRACE(("%u => ", opnd));
	if (TclIsVarDirectReadable(varPtr)) {
	    dictPtr = varPtr->value.objPtr;
	} else {
	    DECACHE_STACK_INFO();
	    dictPtr = TclPtrGetVarIdx(interp, varPtr, NULL, NULL, NULL, 0,
		    opnd);
	    CACHE_STACK_INFO();
	}
	if (dictPtr == NULL) {
	    TclNewObj(dictPtr);
	    allocateDict = 1;
	} else {
	    allocateDict = Tcl_IsShared(dictPtr);
................................................................................
		}
		varPtr->value.objPtr = dictPtr;
	    }
	    objResultPtr = dictPtr;
	} else {
	    Tcl_IncrRefCount(dictPtr);
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrSetVarIdx(interp, varPtr, NULL, NULL, NULL,
		    dictPtr, TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    TclDecrRefCount(dictPtr);
	    if (objResultPtr == NULL) {
		TRACE_ERROR(interp);
		goto gotError;
	    }
................................................................................
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	if (TclIsVarDirectReadable(varPtr)) {
	    dictPtr = varPtr->value.objPtr;
	} else {
	    DECACHE_STACK_INFO();
	    dictPtr = TclPtrGetVarIdx(interp, varPtr, NULL, NULL, NULL,
		    TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    if (dictPtr == NULL) {
		TRACE_ERROR(interp);
		goto gotError;
	    }
	}
................................................................................
		varPtr = varPtr->value.linkPtr;
	    }
	    DECACHE_STACK_INFO();
	    if (valuePtr == NULL) {
		TclObjUnsetVar2(interp,
			localName(iPtr->varFramePtr, duiPtr->varIndices[i]),
			NULL, 0);
	    } else if (TclPtrSetVarIdx(interp, varPtr, NULL, NULL, NULL,
		    valuePtr, TCL_LEAVE_ERR_MSG,
		    duiPtr->varIndices[i]) == NULL) {
		CACHE_STACK_INFO();
		TRACE_ERROR(interp);
		Tcl_DecrRefCount(dictPtr);
		goto gotError;
	    }
................................................................................
	while (TclIsVarLink(varPtr)) {
	    varPtr = varPtr->value.linkPtr;
	}
	if (TclIsVarDirectReadable(varPtr)) {
	    dictPtr = varPtr->value.objPtr;
	} else {
	    DECACHE_STACK_INFO();
	    dictPtr = TclPtrGetVarIdx(interp, varPtr, NULL, NULL, NULL, 0,
		    opnd);
	    CACHE_STACK_INFO();
	}
	if (dictPtr == NULL) {
	    TRACE_APPEND(("storage was unset\n"));
	    NEXT_INST_F(9, 1, 0);
	}
	if (Tcl_DictObjSize(interp, dictPtr, &length) != TCL_OK
................................................................................
	    while (TclIsVarLink(var2Ptr)) {
		var2Ptr = var2Ptr->value.linkPtr;
	    }
	    if (TclIsVarDirectReadable(var2Ptr)) {
		valuePtr = var2Ptr->value.objPtr;
	    } else {
		DECACHE_STACK_INFO();
		valuePtr = TclPtrGetVarIdx(interp, var2Ptr, NULL, NULL, NULL,
			0, duiPtr->varIndices[i]);
		CACHE_STACK_INFO();
	    }
	    if (valuePtr == NULL) {
		Tcl_DictObjRemove(interp, dictPtr, keyPtrPtr[i]);
	    } else if (dictPtr == valuePtr) {
		Tcl_DictObjPut(interp, dictPtr, keyPtrPtr[i],
			Tcl_DuplicateObj(valuePtr));
................................................................................
	}
	if (TclIsVarDirectWritable(varPtr)) {
	    Tcl_IncrRefCount(dictPtr);
	    TclDecrRefCount(varPtr->value.objPtr);
	    varPtr->value.objPtr = dictPtr;
	} else {
	    DECACHE_STACK_INFO();
	    objResultPtr = TclPtrSetVarIdx(interp, varPtr, NULL, NULL, NULL,
		    dictPtr, TCL_LEAVE_ERR_MSG, opnd);
	    CACHE_STACK_INFO();
	    if (objResultPtr == NULL) {
		if (allocdict) {
		    TclDecrRefCount(dictPtr);
		}
		TRACE_ERROR(interp);

Changes to generic/tclInt.decls.

1007
1008
1009
1010
1011
1012
1013


























1014
1015
1016
1017
1018
1019
1020
}

# Allow extensions for optimization
declare 251 {
    int TclRegisterLiteral(void *envPtr,
	    char *bytes, int length, int flags)
}


























 
##############################################################################

# Define the platform specific internal Tcl interface. These functions are
# only available on the designated platform.

interface tclIntPlat






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1007
1008
1009
1010
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1016
1017
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1024
1025
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1032
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1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
}

# Allow extensions for optimization
declare 251 {
    int TclRegisterLiteral(void *envPtr,
	    char *bytes, int length, int flags)
}

# Exporting of the internal API to variables.

declare 252 {
    Tcl_Obj *TclPtrGetVar(Tcl_Interp *interp, Tcl_Var varPtr,
	    Tcl_Var arrayPtr, Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr,
	    const int flags)
}
declare 253 {
    Tcl_Obj *TclPtrSetVar(Tcl_Interp *interp, Tcl_Var varPtr,
	    Tcl_Var arrayPtr, Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr,
	    Tcl_Obj *newValuePtr, const int flags)
}
declare 254 {
    Tcl_Obj *TclPtrIncrObjVar(Tcl_Interp *interp, Tcl_Var varPtr,
	    Tcl_Var arrayPtr, Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr,
	    Tcl_Obj *incrPtr, const int flags)
}
declare 255 {
    int	TclPtrObjMakeUpvar(Tcl_Interp *interp, Tcl_Var otherPtr,
	    Tcl_Obj *myNamePtr, int myFlags)
}
declare 256 {
    int	TclPtrUnsetVar(Tcl_Interp *interp, Tcl_Var varPtr, Tcl_Var arrayPtr,
	    Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr, const int flags)
}
 
##############################################################################

# Define the platform specific internal Tcl interface. These functions are
# only available on the designated platform.

interface tclIntPlat

Changes to generic/tclInt.h.

3931
3932
3933
3934
3935
3936
3937
3938
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3940
3941
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3944
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3951
3952
3953
3954
3955
3956
3957
3958
			    const char *msg, const int createPart1,
			    const int createPart2, Var **arrayPtrPtr);
MODULE_SCOPE Var *	TclLookupArrayElement(Tcl_Interp *interp,
			    Tcl_Obj *arrayNamePtr, Tcl_Obj *elNamePtr,
			    const int flags, const char *msg,
			    const int createPart1, const int createPart2,
			    Var *arrayPtr, int index);
MODULE_SCOPE Tcl_Obj *	TclPtrGetVar(Tcl_Interp *interp,
			    Var *varPtr, Var *arrayPtr, Tcl_Obj *part1Ptr,
			    Tcl_Obj *part2Ptr, const int flags, int index);
MODULE_SCOPE Tcl_Obj *	TclPtrSetVar(Tcl_Interp *interp,
			    Var *varPtr, Var *arrayPtr, Tcl_Obj *part1Ptr,
			    Tcl_Obj *part2Ptr, Tcl_Obj *newValuePtr,
			    const int flags, int index);
MODULE_SCOPE Tcl_Obj *	TclPtrIncrObjVar(Tcl_Interp *interp,
			    Var *varPtr, Var *arrayPtr, Tcl_Obj *part1Ptr,
			    Tcl_Obj *part2Ptr, Tcl_Obj *incrPtr,
			    const int flags, int index);
MODULE_SCOPE int	TclPtrObjMakeUpvar(Tcl_Interp *interp, Var *otherPtr,
			    Tcl_Obj *myNamePtr, int myFlags, int index);

MODULE_SCOPE int	TclPtrUnsetVar(Tcl_Interp *interp, Var *varPtr,
			    Var *arrayPtr, Tcl_Obj *part1Ptr,
			    Tcl_Obj *part2Ptr, const int flags,
			    int index);
MODULE_SCOPE void	TclInvalidateNsPath(Namespace *nsPtr);
MODULE_SCOPE void	TclFindArrayPtrElements(Var *arrayPtr,
			    Tcl_HashTable *tablePtr);







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3931
3932
3933
3934
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3936
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3938
3939
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3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
			    const char *msg, const int createPart1,
			    const int createPart2, Var **arrayPtrPtr);
MODULE_SCOPE Var *	TclLookupArrayElement(Tcl_Interp *interp,
			    Tcl_Obj *arrayNamePtr, Tcl_Obj *elNamePtr,
			    const int flags, const char *msg,
			    const int createPart1, const int createPart2,
			    Var *arrayPtr, int index);
MODULE_SCOPE Tcl_Obj *	TclPtrGetVarIdx(Tcl_Interp *interp,
			    Var *varPtr, Var *arrayPtr, Tcl_Obj *part1Ptr,
			    Tcl_Obj *part2Ptr, const int flags, int index);
MODULE_SCOPE Tcl_Obj *	TclPtrSetVarIdx(Tcl_Interp *interp,
			    Var *varPtr, Var *arrayPtr, Tcl_Obj *part1Ptr,
			    Tcl_Obj *part2Ptr, Tcl_Obj *newValuePtr,
			    const int flags, int index);
MODULE_SCOPE Tcl_Obj *	TclPtrIncrObjVarIdx(Tcl_Interp *interp,
			    Var *varPtr, Var *arrayPtr, Tcl_Obj *part1Ptr,
			    Tcl_Obj *part2Ptr, Tcl_Obj *incrPtr,
			    const int flags, int index);
MODULE_SCOPE int	TclPtrObjMakeUpvarIdx(Tcl_Interp *interp,
			    Var *otherPtr, Tcl_Obj *myNamePtr, int myFlags,
			    int index);
MODULE_SCOPE int	TclPtrUnsetVarIdx(Tcl_Interp *interp, Var *varPtr,
			    Var *arrayPtr, Tcl_Obj *part1Ptr,
			    Tcl_Obj *part2Ptr, const int flags,
			    int index);
MODULE_SCOPE void	TclInvalidateNsPath(Namespace *nsPtr);
MODULE_SCOPE void	TclFindArrayPtrElements(Var *arrayPtr,
			    Tcl_HashTable *tablePtr);

Changes to generic/tclIntDecls.h.

613
614
615
616
617
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620
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870
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881
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883
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1301
1302
1303
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1306
1307










1308
1309
1310
1311
1312
1313
1314
				int *decpt, int *signum, char **endPtr);
/* 250 */
EXTERN void		TclSetSlaveCancelFlags(Tcl_Interp *interp, int flags,
				int force);
/* 251 */
EXTERN int		TclRegisterLiteral(void *envPtr, char *bytes,
				int length, int flags);























typedef struct TclIntStubs {
    int magic;
    void *hooks;

    void (*reserved0)(void);
    void (*reserved1)(void);
................................................................................
    Tcl_HashTable * (*tclGetNamespaceCommandTable) (Tcl_Namespace *nsPtr); /* 245 */
    int (*tclInitRewriteEnsemble) (Tcl_Interp *interp, int numRemoved, int numInserted, Tcl_Obj *const *objv); /* 246 */
    void (*tclResetRewriteEnsemble) (Tcl_Interp *interp, int isRootEnsemble); /* 247 */
    int (*tclCopyChannel) (Tcl_Interp *interp, Tcl_Channel inChan, Tcl_Channel outChan, Tcl_WideInt toRead, Tcl_Obj *cmdPtr); /* 248 */
    char * (*tclDoubleDigits) (double dv, int ndigits, int flags, int *decpt, int *signum, char **endPtr); /* 249 */
    void (*tclSetSlaveCancelFlags) (Tcl_Interp *interp, int flags, int force); /* 250 */
    int (*tclRegisterLiteral) (void *envPtr, char *bytes, int length, int flags); /* 251 */





} TclIntStubs;

extern const TclIntStubs *tclIntStubsPtr;

#ifdef __cplusplus
}
#endif
................................................................................
	(tclIntStubsPtr->tclCopyChannel) /* 248 */
#define TclDoubleDigits \
	(tclIntStubsPtr->tclDoubleDigits) /* 249 */
#define TclSetSlaveCancelFlags \
	(tclIntStubsPtr->tclSetSlaveCancelFlags) /* 250 */
#define TclRegisterLiteral \
	(tclIntStubsPtr->tclRegisterLiteral) /* 251 */











#endif /* defined(USE_TCL_STUBS) */

/* !END!: Do not edit above this line. */

#undef TCL_STORAGE_CLASS
#define TCL_STORAGE_CLASS DLLIMPORT






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910
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1328
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1339
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1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
				int *decpt, int *signum, char **endPtr);
/* 250 */
EXTERN void		TclSetSlaveCancelFlags(Tcl_Interp *interp, int flags,
				int force);
/* 251 */
EXTERN int		TclRegisterLiteral(void *envPtr, char *bytes,
				int length, int flags);
/* 252 */
EXTERN Tcl_Obj *	TclPtrGetVar(Tcl_Interp *interp, Tcl_Var varPtr,
				Tcl_Var arrayPtr, Tcl_Obj *part1Ptr,
				Tcl_Obj *part2Ptr, const int flags);
/* 253 */
EXTERN Tcl_Obj *	TclPtrSetVar(Tcl_Interp *interp, Tcl_Var varPtr,
				Tcl_Var arrayPtr, Tcl_Obj *part1Ptr,
				Tcl_Obj *part2Ptr, Tcl_Obj *newValuePtr,
				const int flags);
/* 254 */
EXTERN Tcl_Obj *	TclPtrIncrObjVar(Tcl_Interp *interp, Tcl_Var varPtr,
				Tcl_Var arrayPtr, Tcl_Obj *part1Ptr,
				Tcl_Obj *part2Ptr, Tcl_Obj *incrPtr,
				const int flags);
/* 255 */
EXTERN int		TclPtrObjMakeUpvar(Tcl_Interp *interp,
				Tcl_Var otherPtr, Tcl_Obj *myNamePtr,
				int myFlags);
/* 256 */
EXTERN int		TclPtrUnsetVar(Tcl_Interp *interp, Tcl_Var varPtr,
				Tcl_Var arrayPtr, Tcl_Obj *part1Ptr,
				Tcl_Obj *part2Ptr, const int flags);

typedef struct TclIntStubs {
    int magic;
    void *hooks;

    void (*reserved0)(void);
    void (*reserved1)(void);
................................................................................
    Tcl_HashTable * (*tclGetNamespaceCommandTable) (Tcl_Namespace *nsPtr); /* 245 */
    int (*tclInitRewriteEnsemble) (Tcl_Interp *interp, int numRemoved, int numInserted, Tcl_Obj *const *objv); /* 246 */
    void (*tclResetRewriteEnsemble) (Tcl_Interp *interp, int isRootEnsemble); /* 247 */
    int (*tclCopyChannel) (Tcl_Interp *interp, Tcl_Channel inChan, Tcl_Channel outChan, Tcl_WideInt toRead, Tcl_Obj *cmdPtr); /* 248 */
    char * (*tclDoubleDigits) (double dv, int ndigits, int flags, int *decpt, int *signum, char **endPtr); /* 249 */
    void (*tclSetSlaveCancelFlags) (Tcl_Interp *interp, int flags, int force); /* 250 */
    int (*tclRegisterLiteral) (void *envPtr, char *bytes, int length, int flags); /* 251 */
    Tcl_Obj * (*tclPtrGetVar) (Tcl_Interp *interp, Tcl_Var varPtr, Tcl_Var arrayPtr, Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr, const int flags); /* 252 */
    Tcl_Obj * (*tclPtrSetVar) (Tcl_Interp *interp, Tcl_Var varPtr, Tcl_Var arrayPtr, Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr, Tcl_Obj *newValuePtr, const int flags); /* 253 */
    Tcl_Obj * (*tclPtrIncrObjVar) (Tcl_Interp *interp, Tcl_Var varPtr, Tcl_Var arrayPtr, Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr, Tcl_Obj *incrPtr, const int flags); /* 254 */
    int (*tclPtrObjMakeUpvar) (Tcl_Interp *interp, Tcl_Var otherPtr, Tcl_Obj *myNamePtr, int myFlags); /* 255 */
    int (*tclPtrUnsetVar) (Tcl_Interp *interp, Tcl_Var varPtr, Tcl_Var arrayPtr, Tcl_Obj *part1Ptr, Tcl_Obj *part2Ptr, const int flags); /* 256 */
} TclIntStubs;

extern const TclIntStubs *tclIntStubsPtr;

#ifdef __cplusplus
}
#endif
................................................................................
	(tclIntStubsPtr->tclCopyChannel) /* 248 */
#define TclDoubleDigits \
	(tclIntStubsPtr->tclDoubleDigits) /* 249 */
#define TclSetSlaveCancelFlags \
	(tclIntStubsPtr->tclSetSlaveCancelFlags) /* 250 */
#define TclRegisterLiteral \
	(tclIntStubsPtr->tclRegisterLiteral) /* 251 */
#define TclPtrGetVar \
	(tclIntStubsPtr->tclPtrGetVar) /* 252 */
#define TclPtrSetVar \
	(tclIntStubsPtr->tclPtrSetVar) /* 253 */
#define TclPtrIncrObjVar \
	(tclIntStubsPtr->tclPtrIncrObjVar) /* 254 */
#define TclPtrObjMakeUpvar \
	(tclIntStubsPtr->tclPtrObjMakeUpvar) /* 255 */
#define TclPtrUnsetVar \
	(tclIntStubsPtr->tclPtrUnsetVar) /* 256 */

#endif /* defined(USE_TCL_STUBS) */

/* !END!: Do not edit above this line. */

#undef TCL_STORAGE_CLASS
#define TCL_STORAGE_CLASS DLLIMPORT

Changes to generic/tclStubInit.c.

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    TclGetNamespaceCommandTable, /* 245 */
    TclInitRewriteEnsemble, /* 246 */
    TclResetRewriteEnsemble, /* 247 */
    TclCopyChannel, /* 248 */
    TclDoubleDigits, /* 249 */
    TclSetSlaveCancelFlags, /* 250 */
    TclRegisterLiteral, /* 251 */





};

static const TclIntPlatStubs tclIntPlatStubs = {
    TCL_STUB_MAGIC,
    0,
#if !defined(_WIN32) && !defined(__CYGWIN__) && !defined(MAC_OSX_TCL) /* UNIX */
    TclGetAndDetachPids, /* 0 */






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    TclGetNamespaceCommandTable, /* 245 */
    TclInitRewriteEnsemble, /* 246 */
    TclResetRewriteEnsemble, /* 247 */
    TclCopyChannel, /* 248 */
    TclDoubleDigits, /* 249 */
    TclSetSlaveCancelFlags, /* 250 */
    TclRegisterLiteral, /* 251 */
    TclPtrGetVar, /* 252 */
    TclPtrSetVar, /* 253 */
    TclPtrIncrObjVar, /* 254 */
    TclPtrObjMakeUpvar, /* 255 */
    TclPtrUnsetVar, /* 256 */
};

static const TclIntPlatStubs tclIntPlatStubs = {
    TCL_STUB_MAGIC,
    0,
#if !defined(_WIN32) && !defined(__CYGWIN__) && !defined(MAC_OSX_TCL) /* UNIX */
    TclGetAndDetachPids, /* 0 */

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    flags &= (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG);
    varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "read",
	    /*createPart1*/ 0, /*createPart2*/ 1, &arrayPtr);
    if (varPtr == NULL) {
	return NULL;
    }

    return TclPtrGetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
	    flags, -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrGetVar --
................................................................................
 *	you must increment its ref count yourself.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclPtrGetVar(














































    Tcl_Interp *interp,		/* Command interpreter in which variable is to
				 * be looked up. */
    register Var *varPtr,	/* The variable to be read.*/
    Var *arrayPtr,		/* NULL for scalar variables, pointer to the
				 * containing array otherwise. */
    Tcl_Obj *part1Ptr,		/* Name of an array (if part2 is non-NULL) or
				 * the name of a variable. */
................................................................................
    if (varPtr == NULL) {
	if (newValuePtr->refCount == 0) {
	    Tcl_DecrRefCount(newValuePtr);
	}
	return NULL;
    }

    return TclPtrSetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
	    newValuePtr, flags, -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrSetVar --
................................................................................
 *	entry didn't exist then a new variable is created.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclPtrSetVar(






















































    Tcl_Interp *interp,		/* Command interpreter in which variable is to
				 * be looked up. */
    register Var *varPtr,	/* Reference to the variable to set. */
    Var *arrayPtr,		/* Reference to the array containing the
				 * variable, or NULL if the variable is a
				 * scalar. */
    Tcl_Obj *part1Ptr,		/* Name of an array (if part2 is non-NULL) or
................................................................................
    varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "read",
	    1, 1, &arrayPtr);
    if (varPtr == NULL) {
	Tcl_AddErrorInfo(interp,
		"\n    (reading value of variable to increment)");
	return NULL;
    }
    return TclPtrIncrObjVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
	    incrPtr, flags, -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrIncrObjVar --
................................................................................
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclPtrIncrObjVar(
    Tcl_Interp *interp,		/* Command interpreter in which variable is to
				 * be found. */
























































    Var *varPtr,		/* Reference to the variable to set. */
    Var *arrayPtr,		/* Reference to the array containing the
				 * variable, or NULL if the variable is a
				 * scalar. */
    Tcl_Obj *part1Ptr,		/* Points to an object holding the name of an
				 * array (if part2 is non-NULL) or the name of
				 * a variable. */
................................................................................
				 * NULL. */
{
    register Tcl_Obj *varValuePtr;

    if (TclIsVarInHash(varPtr)) {
	VarHashRefCount(varPtr)++;
    }
    varValuePtr = TclPtrGetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
	    flags, index);
    if (TclIsVarInHash(varPtr)) {
	VarHashRefCount(varPtr)--;
    }
    if (varValuePtr == NULL) {
	varValuePtr = Tcl_NewIntObj(0);
    }
    if (Tcl_IsShared(varValuePtr)) {
	/* Copy on write */
	varValuePtr = Tcl_DuplicateObj(varValuePtr);

	if (TCL_OK == TclIncrObj(interp, varValuePtr, incrPtr)) {
	    return TclPtrSetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
		    varValuePtr, flags, index);
	} else {
	    Tcl_DecrRefCount(varValuePtr);
	    return NULL;
	}
    } else {
	/* Unshared - can Incr in place */
	if (TCL_OK == TclIncrObj(interp, varValuePtr, incrPtr)) {
................................................................................
	    /*
	     * This seems dumb to write the incremeted value into the var
	     * after we just adjusted the value in place, but the spec for
	     * [incr] requires that write traces fire, and making this call
	     * is the way to make that happen.
	     */

	    return TclPtrSetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
		    varValuePtr, flags, index);
	} else {
	    return NULL;
	}
    }
}
 
/*
................................................................................

    varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "unset",
	    /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
    if (varPtr == NULL) {
	return TCL_ERROR;
    }

    return TclPtrUnsetVar(interp, varPtr, arrayPtr, part1Ptr, part2Ptr, flags,
	    -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrUnsetVar --
 *
................................................................................
 *	then the whole array is deleted.
 *
 *----------------------------------------------------------------------
 */

int
TclPtrUnsetVar(















































    Tcl_Interp *interp,		/* Command interpreter in which varName is to
				 * be looked up. */
    register Var *varPtr,	/* The variable to be unset. */
    Var *arrayPtr,		/* NULL for scalar variables, pointer to the
				 * containing array otherwise. */
    Tcl_Obj *part1Ptr,		/* Name of an array (if part2 is non-NULL) or
				 * the name of a variable. */
................................................................................
	if (varPtr == NULL) {
	    return TCL_ERROR;
	}
	for (i=2 ; i<objc ; i++) {
	    /*
	     * Note that we do not need to increase the refCount of the Var
	     * pointers: should a trace delete the variable, the return value
	     * of TclPtrSetVar will be NULL or emptyObjPtr, and we will not
	     * access the variable again.
	     */

	    varValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, objv[1],
		    NULL, objv[i], TCL_APPEND_VALUE|TCL_LEAVE_ERR_MSG, -1);
	    if ((varValuePtr == NULL) ||
		    (varValuePtr == ((Interp *) interp)->emptyObjPtr)) {
		return TCL_ERROR;
	    }
	}
    }
................................................................................
	 * value is unshared we modify it directly, otherwise we create a new
	 * copy to modify: this is "copy on write".
	 */

	createdNewObj = 0;

	/*
	 * Protect the variable pointers around the TclPtrGetVar call
	 * to insure that they remain valid even if the variable was undefined
	 * and unused.
	 */

	varPtr = TclObjLookupVarEx(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG,
		"set", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
	if (varPtr == NULL) {
................................................................................
	}
	if (TclIsVarInHash(varPtr)) {
	    VarHashRefCount(varPtr)++;
	}
	if (arrayPtr && TclIsVarInHash(arrayPtr)) {
	    VarHashRefCount(arrayPtr)++;
	}
	varValuePtr = TclPtrGetVar(interp, varPtr, arrayPtr, objv[1], NULL,
		TCL_LEAVE_ERR_MSG, -1);
	if (TclIsVarInHash(varPtr)) {
	    VarHashRefCount(varPtr)--;
	}
	if (arrayPtr && TclIsVarInHash(arrayPtr)) {
	    VarHashRefCount(arrayPtr)--;
	}
................................................................................

	/*
	 * Now store the list object back into the variable. If there is an
	 * error setting the new value, decrement its ref count if it was new
	 * and we didn't create the variable.
	 */

	newValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, objv[1], NULL,
		varValuePtr, TCL_LEAVE_ERR_MSG, -1);
	if (newValuePtr == NULL) {
	    return TCL_ERROR;
	}
    }

    /*
................................................................................
	     * by the array. This isn't the case though.
	     */

	    Var *elemVarPtr = TclLookupArrayElement(interp, arrayNameObj,
		    keyPtr, TCL_LEAVE_ERR_MSG, "set", 1, 1, varPtr, -1);

	    if ((elemVarPtr == NULL) ||
		    (TclPtrSetVar(interp, elemVarPtr, varPtr, arrayNameObj,
		    keyPtr, valuePtr, TCL_LEAVE_ERR_MSG, -1) == NULL)) {
		Tcl_DictObjDone(&search);
		return TCL_ERROR;
	    }
	}
	return TCL_OK;
    } else {
................................................................................
	}
	if (elemLen == 0) {
	    goto ensureArray;
	}

	/*
	 * We needn't worry about traces invalidating arrayPtr: should that be
	 * the case, TclPtrSetVar will return NULL so that we break out of the
	 * loop and return an error.
	 */

	copyListObj = TclListObjCopy(NULL, arrayElemObj);
	for (i=0 ; i<elemLen ; i+=2) {
	    Var *elemVarPtr = TclLookupArrayElement(interp, arrayNameObj,
		    elemPtrs[i], TCL_LEAVE_ERR_MSG, "set", 1, 1, varPtr, -1);

	    if ((elemVarPtr == NULL) ||
		    (TclPtrSetVar(interp, elemVarPtr, varPtr, arrayNameObj,
		    elemPtrs[i],elemPtrs[i+1],TCL_LEAVE_ERR_MSG,-1) == NULL)){
		result = TCL_ERROR;
		break;
	    }
	}
	Tcl_DecrRefCount(copyListObj);
	return result;
................................................................................

    pattern = TclGetString(patternObj);
    if (TclMatchIsTrivial(pattern)) {
	varPtr2 = VarHashFindVar(varPtr->value.tablePtr, patternObj);
	if (!varPtr2 || TclIsVarUndefined(varPtr2)) {
	    return TCL_OK;
	}
	return TclPtrUnsetVar(interp, varPtr2, varPtr, varNameObj, patternObj,
		unsetFlags, -1);
    }

    /*
     * Non-trivial case (well, deeply tricky really). We peek inside the hash
     * iterator in order to allow us to guarantee that the following element
     * in the array will not be scrubbed until we have dealt with it. This
     * stops the overall iterator from ending up pointing into deallocated
................................................................................
	if (TclIsVarUndefined(varPtr2)) {
	    CleanupVar(varPtr2, varPtr);
	    continue;
	}

	nameObj = VarHashGetKey(varPtr2);
	if (Tcl_StringMatch(TclGetString(nameObj), pattern)
		&& TclPtrUnsetVar(interp, varPtr2, varPtr, varNameObj,
			nameObj, unsetFlags, -1) != TCL_OK) {
	    /*
	     * If we incremented a refcount, we must decrement it here as we
	     * will not be coming back properly due to the error.
	     */

	    if (protectedVarPtr) {
................................................................................
		    "variable that refers to procedure variable",
		    TclGetString(myNamePtr)));
	    Tcl_SetErrorCode(interp, "TCL", "UPVAR", "INVERTED", NULL);
	    return TCL_ERROR;
	}
    }

    return TclPtrObjMakeUpvar(interp, otherPtr, myNamePtr, myFlags, index);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrMakeUpvar --
 *
................................................................................
    Tcl_Obj *myNamePtr = NULL;
    int result;

    if (myName) {
	myNamePtr = Tcl_NewStringObj(myName, -1);
	Tcl_IncrRefCount(myNamePtr);
    }
    result = TclPtrObjMakeUpvar(interp, otherPtr, myNamePtr, myFlags, index);

    if (myNamePtr) {
	Tcl_DecrRefCount(myNamePtr);
    }
    return result;
}















/* Callers must Incr myNamePtr if they plan to Decr it. */

int
TclPtrObjMakeUpvar(
    Tcl_Interp *interp,		/* Interpreter containing variables. Used for
				 * error messages, too. */
    Var *otherPtr,		/* Pointer to the variable being linked-to. */
    Tcl_Obj *myNamePtr,		/* Name of variable which will refer to
				 * otherP1/otherP2. Must be a scalar. */
    int myFlags,		/* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
				 * indicates scope of myName. */
................................................................................
	 * If a value was specified, set the variable to that value.
	 * Otherwise, if the variable is new, leave it undefined. (If the
	 * variable already exists and no value was specified, leave its value
	 * unchanged; just create the local link if we're in a Tcl procedure).
	 */

	if (i+1 < objc) {	/* A value was specified. */
	    varValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, varNamePtr,
		    NULL, objv[i+1], TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG,-1);

	    if (varValuePtr == NULL) {
		return TCL_ERROR;
	    }
	}

	/*
	 * If we are executing inside a Tcl procedure, create a local variable






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1812
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1814
1815
1816
1817
1818
....
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
....
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
....
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
....
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
....
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
....
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
....
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
....
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
....
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
....
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
....
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
....
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
....
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
....
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
....
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
....
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
....
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
    flags &= (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY|TCL_LEAVE_ERR_MSG);
    varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "read",
	    /*createPart1*/ 0, /*createPart2*/ 1, &arrayPtr);
    if (varPtr == NULL) {
	return NULL;
    }

    return TclPtrGetVarIdx(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
	    flags, -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrGetVar --
................................................................................
 *	you must increment its ref count yourself.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclPtrGetVar(
    Tcl_Interp *interp,		/* Command interpreter in which variable is to
				 * be looked up. */
    Tcl_Var varPtr,		/* The variable to be read.*/
    Tcl_Var arrayPtr,		/* NULL for scalar variables, pointer to the
				 * containing array otherwise. */
    Tcl_Obj *part1Ptr,		/* Name of an array (if part2 is non-NULL) or
				 * the name of a variable. */
    Tcl_Obj *part2Ptr,		/* If non-NULL, gives the name of an element
				 * in the array part1. */
    const int flags)		/* OR-ed combination of TCL_GLOBAL_ONLY, and
				 * TCL_LEAVE_ERR_MSG bits. */
{
    if (varPtr == NULL) {
	Tcl_Panic("varPtr must not be NULL");
    }
    if (part1Ptr == NULL) {
	Tcl_Panic("part1Ptr must not be NULL");
    }
    return TclPtrGetVarIdx(interp, (Var *) varPtr, (Var *) arrayPtr,
	    part1Ptr, part2Ptr, flags, -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrGetVarIdx --
 *
 *	Return the value of a Tcl variable as a Tcl object, given the pointers
 *	to the variable's (and possibly containing array's) VAR structure.
 *
 * Results:
 *	The return value points to the current object value of the variable
 *	given by varPtr. If the specified variable doesn't exist, or if there
 *	is a clash in array usage, then NULL is returned and a message will be
 *	left in the interpreter's result if the TCL_LEAVE_ERR_MSG flag is set.
 *
 * Side effects:
 *	The ref count for the returned object is _not_ incremented to reflect
 *	the returned reference; if you want to keep a reference to the object
 *	you must increment its ref count yourself.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclPtrGetVarIdx(
    Tcl_Interp *interp,		/* Command interpreter in which variable is to
				 * be looked up. */
    register Var *varPtr,	/* The variable to be read.*/
    Var *arrayPtr,		/* NULL for scalar variables, pointer to the
				 * containing array otherwise. */
    Tcl_Obj *part1Ptr,		/* Name of an array (if part2 is non-NULL) or
				 * the name of a variable. */
................................................................................
    if (varPtr == NULL) {
	if (newValuePtr->refCount == 0) {
	    Tcl_DecrRefCount(newValuePtr);
	}
	return NULL;
    }

    return TclPtrSetVarIdx(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
	    newValuePtr, flags, -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrSetVar --
................................................................................
 *	entry didn't exist then a new variable is created.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclPtrSetVar(
    Tcl_Interp *interp,		/* Command interpreter in which variable is to
				 * be looked up. */
    Tcl_Var varPtr,		/* Reference to the variable to set. */
    Tcl_Var arrayPtr,		/* Reference to the array containing the
				 * variable, or NULL if the variable is a
				 * scalar. */
    Tcl_Obj *part1Ptr,		/* Name of an array (if part2 is non-NULL) or
				 * the name of a variable. */
    Tcl_Obj *part2Ptr,		/* If non-NULL, gives the name of an element
				 * in the array part1. */
    Tcl_Obj *newValuePtr,	/* New value for variable. */
    const int flags)		/* OR-ed combination of TCL_GLOBAL_ONLY, and
				 * TCL_LEAVE_ERR_MSG bits. */
{
    if (varPtr == NULL) {
	Tcl_Panic("varPtr must not be NULL");
    }
    if (part1Ptr == NULL) {
	Tcl_Panic("part1Ptr must not be NULL");
    }
    if (newValuePtr == NULL) {
	Tcl_Panic("newValuePtr must not be NULL");
    }
    return TclPtrSetVarIdx(interp, (Var *) varPtr, (Var *) arrayPtr,
	    part1Ptr, part2Ptr, newValuePtr, flags, -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrSetVarIdx --
 *
 *	This function is the same as Tcl_SetVar2Ex above, except that it
 *	requires pointers to the variable's Var structs in addition to the
 *	variable names.
 *
 * Results:
 *	Returns a pointer to the Tcl_Obj holding the new value of the
 *	variable. If the write operation was disallowed because an array was
 *	expected but not found (or vice versa), then NULL is returned; if the
 *	TCL_LEAVE_ERR_MSG flag is set, then an explanatory message will be
 *	left in the interpreter's result. Note that the returned object may
 *	not be the same one referenced by newValuePtr; this is because
 *	variable traces may modify the variable's value.
 *
 * Side effects:
 *	The value of the given variable is set. If either the array or the
 *	entry didn't exist then a new variable is created.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclPtrSetVarIdx(
    Tcl_Interp *interp,		/* Command interpreter in which variable is to
				 * be looked up. */
    register Var *varPtr,	/* Reference to the variable to set. */
    Var *arrayPtr,		/* Reference to the array containing the
				 * variable, or NULL if the variable is a
				 * scalar. */
    Tcl_Obj *part1Ptr,		/* Name of an array (if part2 is non-NULL) or
................................................................................
    varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "read",
	    1, 1, &arrayPtr);
    if (varPtr == NULL) {
	Tcl_AddErrorInfo(interp,
		"\n    (reading value of variable to increment)");
	return NULL;
    }
    return TclPtrIncrObjVarIdx(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
	    incrPtr, flags, -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrIncrObjVar --
................................................................................
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclPtrIncrObjVar(
    Tcl_Interp *interp,		/* Command interpreter in which variable is to
				 * be found. */
    Tcl_Var varPtr,		/* Reference to the variable to set. */
    Tcl_Var arrayPtr,		/* Reference to the array containing the
				 * variable, or NULL if the variable is a
				 * scalar. */
    Tcl_Obj *part1Ptr,		/* Points to an object holding the name of an
				 * array (if part2 is non-NULL) or the name of
				 * a variable. */
    Tcl_Obj *part2Ptr,		/* If non-null, points to an object holding
				 * the name of an element in the array
				 * part1Ptr. */
    Tcl_Obj *incrPtr,		/* Increment value. */
/* TODO: Which of these flag values really make sense? */
    const int flags)		/* Various flags that tell how to incr value:
				 * any of TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
				 * TCL_APPEND_VALUE, TCL_LIST_ELEMENT,
				 * TCL_LEAVE_ERR_MSG. */
{
    if (varPtr == NULL) {
	Tcl_Panic("varPtr must not be NULL");
    }
    if (part1Ptr == NULL) {
	Tcl_Panic("part1Ptr must not be NULL");
    }
    return TclPtrIncrObjVarIdx(interp, (Var *) varPtr, (Var *) arrayPtr,
	    part1Ptr, part2Ptr, incrPtr, flags, -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrIncrObjVarIdx --
 *
 *	Given the pointers to a variable and possible containing array,
 *	increment the Tcl object value of the variable by a Tcl_Obj increment.
 *
 * Results:
 *	Returns a pointer to the Tcl_Obj holding the new value of the
 *	variable. If the specified variable doesn't exist, or there is a clash
 *	in array usage, or an error occurs while executing variable traces,
 *	then NULL is returned and a message will be left in the interpreter's
 *	result.
 *
 * Side effects:
 *	The value of the given variable is incremented by the specified
 *	amount. If either the array or the entry didn't exist then a new
 *	variable is created. The ref count for the returned object is _not_
 *	incremented to reflect the returned reference; if you want to keep a
 *	reference to the object you must increment its ref count yourself.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
TclPtrIncrObjVarIdx(
    Tcl_Interp *interp,		/* Command interpreter in which variable is to
				 * be found. */
    Var *varPtr,		/* Reference to the variable to set. */
    Var *arrayPtr,		/* Reference to the array containing the
				 * variable, or NULL if the variable is a
				 * scalar. */
    Tcl_Obj *part1Ptr,		/* Points to an object holding the name of an
				 * array (if part2 is non-NULL) or the name of
				 * a variable. */
................................................................................
				 * NULL. */
{
    register Tcl_Obj *varValuePtr;

    if (TclIsVarInHash(varPtr)) {
	VarHashRefCount(varPtr)++;
    }
    varValuePtr = TclPtrGetVarIdx(interp, varPtr, arrayPtr, part1Ptr,
	    part2Ptr, flags, index);
    if (TclIsVarInHash(varPtr)) {
	VarHashRefCount(varPtr)--;
    }
    if (varValuePtr == NULL) {
	varValuePtr = Tcl_NewIntObj(0);
    }
    if (Tcl_IsShared(varValuePtr)) {
	/* Copy on write */
	varValuePtr = Tcl_DuplicateObj(varValuePtr);

	if (TCL_OK == TclIncrObj(interp, varValuePtr, incrPtr)) {
	    return TclPtrSetVarIdx(interp, varPtr, arrayPtr, part1Ptr,
		    part2Ptr, varValuePtr, flags, index);
	} else {
	    Tcl_DecrRefCount(varValuePtr);
	    return NULL;
	}
    } else {
	/* Unshared - can Incr in place */
	if (TCL_OK == TclIncrObj(interp, varValuePtr, incrPtr)) {
................................................................................
	    /*
	     * This seems dumb to write the incremeted value into the var
	     * after we just adjusted the value in place, but the spec for
	     * [incr] requires that write traces fire, and making this call
	     * is the way to make that happen.
	     */

	    return TclPtrSetVarIdx(interp, varPtr, arrayPtr, part1Ptr,
		    part2Ptr, varValuePtr, flags, index);
	} else {
	    return NULL;
	}
    }
}
 
/*
................................................................................

    varPtr = TclObjLookupVarEx(interp, part1Ptr, part2Ptr, flags, "unset",
	    /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
    if (varPtr == NULL) {
	return TCL_ERROR;
    }

    return TclPtrUnsetVarIdx(interp, varPtr, arrayPtr, part1Ptr, part2Ptr,
	    flags, -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrUnsetVar --
 *
................................................................................
 *	then the whole array is deleted.
 *
 *----------------------------------------------------------------------
 */

int
TclPtrUnsetVar(
    Tcl_Interp *interp,		/* Command interpreter in which varName is to
				 * be looked up. */
    Tcl_Var varPtr,		/* The variable to be unset. */
    Tcl_Var arrayPtr,		/* NULL for scalar variables, pointer to the
				 * containing array otherwise. */
    Tcl_Obj *part1Ptr,		/* Name of an array (if part2 is non-NULL) or
				 * the name of a variable. */
    Tcl_Obj *part2Ptr,		/* If non-NULL, gives the name of an element
				 * in the array part1. */
    const int flags)		/* OR-ed combination of any of
				 * TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
				 * TCL_LEAVE_ERR_MSG. */
{
    if (varPtr == NULL) {
	Tcl_Panic("varPtr must not be NULL");
    }
    if (part1Ptr == NULL) {
	Tcl_Panic("part1Ptr must not be NULL");
    }
    return TclPtrUnsetVarIdx(interp, (Var *) varPtr, (Var *) arrayPtr,
	    part1Ptr, part2Ptr, flags, -1);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrUnsetVarIdx --
 *
 *	Delete a variable, given the pointers to the variable's (and possibly
 *	containing array's) VAR structure.
 *
 * Results:
 *	Returns TCL_OK if the variable was successfully deleted, TCL_ERROR if
 *	the variable can't be unset. In the event of an error, if the
 *	TCL_LEAVE_ERR_MSG flag is set then an error message is left in the
 *	interp's result.
 *
 * Side effects:
 *	If varPtr and arrayPtr indicate a local or global variable in interp,
 *	it is deleted. If varPtr is an array reference and part2Ptr is NULL,
 *	then the whole array is deleted.
 *
 *----------------------------------------------------------------------
 */

int
TclPtrUnsetVarIdx(
    Tcl_Interp *interp,		/* Command interpreter in which varName is to
				 * be looked up. */
    register Var *varPtr,	/* The variable to be unset. */
    Var *arrayPtr,		/* NULL for scalar variables, pointer to the
				 * containing array otherwise. */
    Tcl_Obj *part1Ptr,		/* Name of an array (if part2 is non-NULL) or
				 * the name of a variable. */
................................................................................
	if (varPtr == NULL) {
	    return TCL_ERROR;
	}
	for (i=2 ; i<objc ; i++) {
	    /*
	     * Note that we do not need to increase the refCount of the Var
	     * pointers: should a trace delete the variable, the return value
	     * of TclPtrSetVarIdx will be NULL or emptyObjPtr, and we will not
	     * access the variable again.
	     */

	    varValuePtr = TclPtrSetVarIdx(interp, varPtr, arrayPtr, objv[1],
		    NULL, objv[i], TCL_APPEND_VALUE|TCL_LEAVE_ERR_MSG, -1);
	    if ((varValuePtr == NULL) ||
		    (varValuePtr == ((Interp *) interp)->emptyObjPtr)) {
		return TCL_ERROR;
	    }
	}
    }
................................................................................
	 * value is unshared we modify it directly, otherwise we create a new
	 * copy to modify: this is "copy on write".
	 */

	createdNewObj = 0;

	/*
	 * Protect the variable pointers around the TclPtrGetVarIdx call
	 * to insure that they remain valid even if the variable was undefined
	 * and unused.
	 */

	varPtr = TclObjLookupVarEx(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG,
		"set", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
	if (varPtr == NULL) {
................................................................................
	}
	if (TclIsVarInHash(varPtr)) {
	    VarHashRefCount(varPtr)++;
	}
	if (arrayPtr && TclIsVarInHash(arrayPtr)) {
	    VarHashRefCount(arrayPtr)++;
	}
	varValuePtr = TclPtrGetVarIdx(interp, varPtr, arrayPtr, objv[1], NULL,
		TCL_LEAVE_ERR_MSG, -1);
	if (TclIsVarInHash(varPtr)) {
	    VarHashRefCount(varPtr)--;
	}
	if (arrayPtr && TclIsVarInHash(arrayPtr)) {
	    VarHashRefCount(arrayPtr)--;
	}
................................................................................

	/*
	 * Now store the list object back into the variable. If there is an
	 * error setting the new value, decrement its ref count if it was new
	 * and we didn't create the variable.
	 */

	newValuePtr = TclPtrSetVarIdx(interp, varPtr, arrayPtr, objv[1], NULL,
		varValuePtr, TCL_LEAVE_ERR_MSG, -1);
	if (newValuePtr == NULL) {
	    return TCL_ERROR;
	}
    }

    /*
................................................................................
	     * by the array. This isn't the case though.
	     */

	    Var *elemVarPtr = TclLookupArrayElement(interp, arrayNameObj,
		    keyPtr, TCL_LEAVE_ERR_MSG, "set", 1, 1, varPtr, -1);

	    if ((elemVarPtr == NULL) ||
		    (TclPtrSetVarIdx(interp, elemVarPtr, varPtr, arrayNameObj,
		    keyPtr, valuePtr, TCL_LEAVE_ERR_MSG, -1) == NULL)) {
		Tcl_DictObjDone(&search);
		return TCL_ERROR;
	    }
	}
	return TCL_OK;
    } else {
................................................................................
	}
	if (elemLen == 0) {
	    goto ensureArray;
	}

	/*
	 * We needn't worry about traces invalidating arrayPtr: should that be
	 * the case, TclPtrSetVarIdx will return NULL so that we break out of
	 * the loop and return an error.
	 */

	copyListObj = TclListObjCopy(NULL, arrayElemObj);
	for (i=0 ; i<elemLen ; i+=2) {
	    Var *elemVarPtr = TclLookupArrayElement(interp, arrayNameObj,
		    elemPtrs[i], TCL_LEAVE_ERR_MSG, "set", 1, 1, varPtr, -1);

	    if ((elemVarPtr == NULL) ||
		    (TclPtrSetVarIdx(interp, elemVarPtr, varPtr, arrayNameObj,
		    elemPtrs[i],elemPtrs[i+1],TCL_LEAVE_ERR_MSG,-1) == NULL)){
		result = TCL_ERROR;
		break;
	    }
	}
	Tcl_DecrRefCount(copyListObj);
	return result;
................................................................................

    pattern = TclGetString(patternObj);
    if (TclMatchIsTrivial(pattern)) {
	varPtr2 = VarHashFindVar(varPtr->value.tablePtr, patternObj);
	if (!varPtr2 || TclIsVarUndefined(varPtr2)) {
	    return TCL_OK;
	}
	return TclPtrUnsetVarIdx(interp, varPtr2, varPtr, varNameObj,
		patternObj, unsetFlags, -1);
    }

    /*
     * Non-trivial case (well, deeply tricky really). We peek inside the hash
     * iterator in order to allow us to guarantee that the following element
     * in the array will not be scrubbed until we have dealt with it. This
     * stops the overall iterator from ending up pointing into deallocated
................................................................................
	if (TclIsVarUndefined(varPtr2)) {
	    CleanupVar(varPtr2, varPtr);
	    continue;
	}

	nameObj = VarHashGetKey(varPtr2);
	if (Tcl_StringMatch(TclGetString(nameObj), pattern)
		&& TclPtrUnsetVarIdx(interp, varPtr2, varPtr, varNameObj,
			nameObj, unsetFlags, -1) != TCL_OK) {
	    /*
	     * If we incremented a refcount, we must decrement it here as we
	     * will not be coming back properly due to the error.
	     */

	    if (protectedVarPtr) {
................................................................................
		    "variable that refers to procedure variable",
		    TclGetString(myNamePtr)));
	    Tcl_SetErrorCode(interp, "TCL", "UPVAR", "INVERTED", NULL);
	    return TCL_ERROR;
	}
    }

    return TclPtrObjMakeUpvarIdx(interp, otherPtr, myNamePtr, myFlags, index);
}
 
/*
 *----------------------------------------------------------------------
 *
 * TclPtrMakeUpvar --
 *
................................................................................
    Tcl_Obj *myNamePtr = NULL;
    int result;

    if (myName) {
	myNamePtr = Tcl_NewStringObj(myName, -1);
	Tcl_IncrRefCount(myNamePtr);
    }
    result = TclPtrObjMakeUpvarIdx(interp, otherPtr, myNamePtr, myFlags,
	    index);
    if (myNamePtr) {
	Tcl_DecrRefCount(myNamePtr);
    }
    return result;
}

int
TclPtrObjMakeUpvar(
    Tcl_Interp *interp,		/* Interpreter containing variables. Used for
				 * error messages, too. */
    Tcl_Var otherPtr,		/* Pointer to the variable being linked-to. */
    Tcl_Obj *myNamePtr,		/* Name of variable which will refer to
				 * otherP1/otherP2. Must be a scalar. */
    int myFlags)		/* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
				 * indicates scope of myName. */
{
    return TclPtrObjMakeUpvarIdx(interp, (Var *) otherPtr, myNamePtr, myFlags,
	    -1);
}

/* Callers must Incr myNamePtr if they plan to Decr it. */

int
TclPtrObjMakeUpvarIdx(
    Tcl_Interp *interp,		/* Interpreter containing variables. Used for
				 * error messages, too. */
    Var *otherPtr,		/* Pointer to the variable being linked-to. */
    Tcl_Obj *myNamePtr,		/* Name of variable which will refer to
				 * otherP1/otherP2. Must be a scalar. */
    int myFlags,		/* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
				 * indicates scope of myName. */
................................................................................
	 * If a value was specified, set the variable to that value.
	 * Otherwise, if the variable is new, leave it undefined. (If the
	 * variable already exists and no value was specified, leave its value
	 * unchanged; just create the local link if we're in a Tcl procedure).
	 */

	if (i+1 < objc) {	/* A value was specified. */
	    varValuePtr = TclPtrSetVarIdx(interp, varPtr, arrayPtr,
		    varNamePtr, NULL, objv[i+1],
		    (TCL_NAMESPACE_ONLY | TCL_LEAVE_ERR_MSG), -1);
	    if (varValuePtr == NULL) {
		return TCL_ERROR;
	    }
	}

	/*
	 * If we are executing inside a Tcl procedure, create a local variable